A full parameter measuring device and method for internal thread hole of a part

Abstract

This invention relates to a device and method for measuring all parameters of an internal threaded hole in a component. The measuring device includes a main unit, a contact scanning probe assembly, and a processing terminal. One end of the probe assembly is connected to the main unit, and the other end extends into the internal threaded hole to scan the internal thread. The main unit controls the movement of the probe assembly. The processing terminal is communicatively connected to the main unit and collects and processes the thread image data acquired by the probe assembly to obtain thread parameters. This invention utilizes a contact scanning probe assembly to scan a certain length of thread image. The processing terminal directly measures and calculates all parameters required for measuring the internal threaded hole based on the thread image. It is not only simple and convenient to operate, but also provides a simple, direct, and accurate method for obtaining parameters, achieving full parameter measurement of internal threaded holes, including thread angle, thread half-angle, pitch, major, minor, and functional pitch diameters.

Description

Technical Field

[0001] This invention belongs to the field of thread measurement technology, and specifically relates to a device and method for measuring the full parameters of internal threaded holes in components. Background Technology

[0002] Currently, threaded holes are usually inspected using go and no-go gauges. The specific inspection method is as follows: if the go gauge (T) can be smoothly screwed into the threaded hole being tested, it is qualified; otherwise, it is unqualified. Then, the no-go gauge (Z) is used. If it can be smoothly screwed into the threaded hole being tested for 2 turns or more, it is unqualified; otherwise, it is qualified.

[0003] For high-precision large components, such as railway vehicle bogie frames, not only are the precision requirements for threaded holes high, but the precision requirements for the effective length of the thread are also high. However, the current market for measuring internal threaded holes of large track components is limited by on-site testing conditions and the inability to clamp large components. At present, it is basically only possible to use thread go and no-go gauges for inspection and measurement. Therefore, it can only determine whether it is qualified. A large number of calibration gauges are required for internal threaded holes of different diameters and specifications, and it is impossible to measure the specific parameters of the internal threaded holes. Summary of the Invention

[0004] The main technical problem solved by this invention is to provide a device for measuring the full parameters of internal threaded holes of components that can accurately measure all parameters and is easy to operate, and to provide a method for measuring the full parameters of internal threaded holes of components.

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0006] A device for measuring all parameters of an internal threaded hole in a component includes a main unit, a contact scanning probe assembly, and a processing terminal. One end of the probe assembly is connected to the main unit, and the other end of the probe assembly extends into the internal threaded hole to scan the internal thread. The main unit controls the operation of the probe assembly, and the processing terminal is communicatively connected to the main unit. The processing terminal collects and processes the thread image data acquired by the probe assembly to obtain thread parameters.

[0007] Furthermore, the probe assembly includes a probe rod and a probe, and a motion control component is installed in the host. One end of the probe rod is fixedly connected to the motion control component, and the probe is vertically fixed to the other end of the probe rod.

[0008] More preferably, two probes are symmetrically arranged at the end of the probe rod, and the included angle between the two probes is 180°.

[0009] Furthermore, an operation button is provided on the casing of the host, which is used to drive the probe assembly to perform actions.

[0010] Furthermore, a clamp mounting base and a measuring mounting platform are installed on the host. The clamp mounting base is installed on the host, and the measuring mounting platform is detachably installed on the clamp mounting base. The other end of the probe assembly passes through the clamp mounting base and the measuring mounting platform.

[0011] Furthermore, the fixture mounting base is provided with a clamping groove, which is located on the surface of the fixture mounting base opposite to the host. The measuring mounting platform is fixed in the clamping groove. A first clearance groove for passing through the probe assembly is provided on the groove surface of the clamping groove. The first clearance groove is located on the center line of the fixture mounting base and extends along the X-axis moving direction of the probe assembly.

[0012] Furthermore, the clamping groove is a stepped groove, the clamping groove has a first groove surface and a second groove surface, the groove width of the first groove surface is greater than that of the second groove surface, the first clearance groove is disposed on the second groove surface, and the groove width of the second groove surface is greater than that of the first clearance groove.

[0013] Furthermore, the measuring mounting platform includes a base plate, on which a needle-avoiding groove for the probe assembly to pass through is formed. The needle-avoiding groove is located on the center line of the base plate and extends along the X-axis moving direction of the probe assembly. Two positioning plates are vertically arranged on the base plate, located on both sides of the needle-avoiding groove. During measurement, the positioning plates contact the inner surface of the internal threaded hole to achieve positioning.

[0014] Furthermore, two limiting strips for center positioning with the fixture mounting base are provided on the other side of the base plate away from the positioning plate, and the limiting strips are provided on both sides of the needle avoidance groove.

[0015] Furthermore, the measuring device also includes a calibration datum gauge for calibrating the probe assembly. The calibration datum gauge is a ring with a flat end face and a central hole. The calibration datum gauge is fitted onto the outside of the probe assembly.

[0016] More preferably, the calibration datum gauge is mounted on the host via an adjustment mounting base, the adjustment mounting base being detachably mounted on the host, and the adjustment mounting base being provided with a second clearance groove for the probe assembly to pass through.

[0017] Another technical solution of the present invention is:

[0018] A method for measuring all parameters of an internal threaded hole in a component includes the following steps:

[0019] S10. Control the probe assembly to extend into the internal threaded hole along the axial direction of the internal threaded hole, control the probe in the probe assembly to move to one side of the internal threaded hole, so that the probe contacts the tooth groove or tooth tip of the internal threaded hole, and moves from the first depth h1 to the second depth h2. During the movement, a contact scan is performed, and the scan result is transmitted to the processing terminal.

[0020] S20. Control the probe to move to the other side of the internal thread hole diameter direction, so that the probe contacts the tooth groove or tooth tip on the other side of the internal thread hole, and moves in the opposite direction from the second depth h2 to the first depth h1. During the movement, a contact scan is performed, and the scan result is transmitted to the processing terminal.

[0021] S30. In the processing terminal, the scanned image is expanded, and the required measurement parameters for the internal threaded hole are directly measured and calculated on the scanned image according to the parameter definition.

[0022] In summary, the present invention provides a device and method for measuring all parameters of internal threaded holes in components. It utilizes a contact scanning probe assembly to scan a thread image of a certain length. A processing terminal then directly measures and calculates all parameters required for the internal threaded hole from the graphic image based on the definitions of each parameter. This method is not only simple and convenient to operate, but also provides a simple, direct, and accurate way to obtain parameters. It achieves full parameter measurement of internal threaded holes, including thread angle, thread half-angle, pitch, major, minor, and functional pitch diameters. This solves the problem in existing technologies where specific parameters cannot be measured for internal threaded holes in large rail vehicle components. It also addresses the issue that existing go / no-go gauges cannot measure all parameters of internal threaded holes, such as thread angle, thread half-angle, pitch, major, minor, and functional pitch diameters, and can only provide a simple judgment on whether the thread is qualified.

[0023] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0024] The accompanying drawings, as part of this invention, are provided to further illustrate the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation thereof. Clearly, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0025] In the attached diagram:

[0026] Figure 1 This is a schematic diagram of the structure of the measuring device and components of the present invention after assembly;

[0027] Figure 2 This is a schematic diagram of the measuring device of the present invention;

[0028] Figure 3 This is a schematic diagram of the measuring device of the present invention (with the measuring mounting platform removed);

[0029] Figure 4 This is a schematic diagram of the base plate structure of the present invention;

[0030] Figure 5 This is a schematic diagram of the calibration device structure of the measuring device of the present invention;

[0031] Figure 6 This is a flowchart of the calibration method for the measuring device of the present invention;

[0032] Figure 7 This is a schematic diagram of the measurement method of the present invention.

[0033] like Figures 1 to 7 As shown, component 10 has an internal threaded hole 11;

[0034] Main unit 20, outer casing 21, operation buttons 22, handle 23;

[0035] Probe assembly 30, probe 31, probe 32;

[0036] Processing terminal 40;

[0037] The fixture mounting base 50, the clamping groove 51, the first groove surface 511, the second groove surface 512, the first clearance groove 52, and the threaded hole 53 are all included.

[0038] Measuring mounting platform 60, base plate 61, pin avoidance groove 62, positioning plate 63, limit strip 64, screw hole 65;

[0039] Calibrate datum 70, center hole 71;

[0040] Adjust the mounting base 80, base plate 81, and second clearance groove 82.

[0041] It should be noted that the accompanying drawings and text description are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0043] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] like Figures 1 to 5 As shown, the present invention provides a full parameter measuring device for internal threaded holes of components, which is used to obtain full parameter results such as tooth profile angle, tooth profile half angle, pitch, major, minor and major diameters, and working diameter of the internal threaded hole 11 to be measured on the component 10 by measurement.

[0046] like Figures 1 to 4 As shown, the measuring device includes a host 20, a contact scanning probe assembly 30, and a processing terminal 40. One end of the probe assembly 30 is connected to the host 20, and the other end of the probe assembly 30 extends into the internal thread hole 11 to scan the internal thread. The host 20 controls the operation of the probe assembly 30. The processing terminal 40 is connected to the host 20 via a communication line. The processing terminal 40 collects and processes the thread image data acquired by the probe assembly 30 to obtain thread parameters. The processing terminal 40 uses a computer or similar device, and the measuring personnel process the thread image data on the computer.

[0047] Specifically, such as Figure 1 As shown, the main unit 20 includes a housing 21, which is generally rectangular. A data acquisition unit, a motion control component, and a communication unit (not shown) are installed inside the housing 21. Operation buttons 22 are provided on the side of the housing 21 for the measuring personnel to input operation commands, such as "on," "off," "up," "down," "forward," and "backward," allowing the measuring personnel to control the probe assembly 30 to move along the X-axis (up and down) and Z-axis (forward and back). In this embodiment, the X-axis refers to the diameter direction of the internal threaded hole 11, and the Z-axis refers to the axial direction of the internal threaded hole 11. The motion control component inside the main unit 20 can be a commercially available motion control component, as long as its movement accuracy error is ≤0.05mm, it will meet the usage requirements.

[0048] To facilitate operation of the measuring device for inspecting the internal threaded hole 11 on the component 10, this embodiment is further preferably equipped with a handle 23 for carrying on the housing 21. The entire main unit 20 is compact in size, making it easy to carry and operate by hand.

[0049] like Figure 2 As shown, in this embodiment, the probe assembly 30 includes a probe rod 31 and a probe 32. One end of the probe rod 31 is connected to a motion control component within the host 20. The probe 32 is vertically fixed to the other end of the probe rod 31, which is suspended away from the host 20. The host 20 drives the probe 32 in the probe assembly 30 to move along the X-axis and Z-axis directions. To ensure scanning effect, the probe 32 is preferably made of ultra-hard carbide, and a contact scanning device is installed at the end of the probe 32.

[0050] In this embodiment, it is further preferred that there are two symmetrical probes 32, the two probes 32 are perpendicular to the probe rod 31, the two probes 32 are on a straight line, and the included angle between the two probes 32 is 180°.

[0051] In order to achieve the positioning between the measuring device and the part 10 to be measured, so as to facilitate measurement and ensure scanning effect and measurement accuracy, this embodiment further selects a fixture mounting base 50 and a measuring mounting platform 60 to be installed on the host 20. The measuring mounting platform 60 is installed on the fixture mounting base 50. The fixture mounting base 50 has the function of fixing and positioning the measuring mounting platform 60. The measuring mounting platform 60 plays the role of positioning between itself and the internal thread hole 11 to be measured on the part 10 during measurement. The probe 32 passes through the fixture mounting base 50 and the measuring mounting platform 60 and then extends into the internal thread hole 11.

[0052] Specifically, such as Figure 2 and Figure 3 As shown, the clamp mounting base 50 is installed on one side of the main unit 20. The clamp mounting base 50 is generally rectangular, and its outer contour is adapted to the outer shell 21 of the main unit 20, so that the clamp mounting base 50 and the main unit 20 form a whole after installation. The clamp mounting base 50 is preferably fixed to the main unit 20 in a detachable manner to facilitate the installation and removal of the clamp mounting base 50. For example, the clamp mounting base 50 can be fixed to the outer shell 21 of the main unit 20 with screws.

[0053] In a further preferred embodiment, a clamping groove 51 is provided on the fixture mounting base 50, and a measuring mounting stage 60 is installed in the clamping groove 51. The clamping groove 51 is located on the surface of the fixture mounting base 50 away from the main unit 20, and the measuring mounting stage 60 is fixed in the clamping groove 51. A first clearance groove 52 for the probe 31 and probe 32 to pass through is provided on the groove surface of the clamping groove 51. The first clearance groove 52 is located on the center line of the fixture mounting base 50. The first clearance groove 52 is an elongated through groove and extends along the X-axis moving direction of the probe 32. The length of the first clearance groove 52 is greater than the maximum stroke of the probe 32 on the X-axis.

[0054] To further facilitate the positioning and fixing of the measuring mounting platform 60, in this embodiment, the clamping groove 51 is preferably a stepped groove. The clamping groove 51 has a first groove surface 511 and a second groove surface 512. The first groove surface 511 is located on the outside of the clamping groove 51 and its groove width is greater than that of the second groove surface 512. The center line of the first groove surface 511 coincides with the center line of the second groove surface 512. A first clearance groove 52 is provided on the second groove surface 512, and the groove width of the second groove surface 512 is greater than the width of the first clearance groove 52.

[0055] In this embodiment, the fixture mounting base 50 is preferably made of high-rigidity hard aluminum alloy, so that during the measurement process, the fixture mounting base 50 and the surface of the component 10 are stably and tightly attached, thereby ensuring measurement accuracy and no error.

[0056] like Figure 2 and Figure 4 As shown, in this embodiment, the measuring mounting platform 60 includes a base plate 61, which is generally rectangular in shape. A needle-avoiding groove 62 is formed on the base plate 61 for the probe 31 and probe 32 to pass through. The needle-avoiding groove 62 is correspondingly provided with the first clearance groove 52 on the fixture mounting base 50. The needle-avoiding groove 62 is also located on the center line of the base plate 61. The needle-avoiding groove 62 is an elongated through groove and extends along the X-axis moving direction of the probe 32. The length of the needle-avoiding groove 62 is the same as the length of the first clearance groove 52, and the width of the needle-avoiding groove 62 is also the same as the width of the first clearance groove 52.

[0057] To facilitate measurement and ensure measurement accuracy, the width of the base plate 61 matches the width of the first groove surface 511 on the fixture mounting base 50. During installation, the base plate 61 is just fitted between the two side walls of the first groove surface 511. The side surface of the base plate 61 facing the host 20 is attached to the first groove surface 511. The center line of the base plate 61 and the center line of the clamping groove 51 are located in the same vertical plane. The thickness of the base plate 61 is greater than or equal to the distance between the first groove surface 511 and the outermost surface of the fixture mounting base 50. During measurement, the outer surface of the base plate 61 (the side surface facing away from the host 20) abuts against the surface of the component 10 with the internal thread hole 11.

[0058] Furthermore, two positioning plates 63 are provided on the base plate 61. The two positioning plates 63 are vertically arranged on the outer surface of the base plate 61, are parallel to each other and are the same size, and are located on both sides of the needle avoidance groove 62 in the width direction. The two positioning plates 63 are located at the center position of the base plate 61 in the length direction. During measurement, the two positioning plates 63 are inserted into the internal threaded hole 11, so that the edges of the two positioning plates 63 contact the inner surface of the internal threaded hole 11 to achieve positioning. After positioning, the center line of the needle avoidance groove 62 is parallel to or coincides with the diameter of the internal threaded hole 11, so that when the probe assembly 30 moves along the X-axis, the path is the diameter direction of the internal threaded hole 11, ensuring the accuracy of the measurement value.

[0059] In this embodiment, more preferably, the measuring mounting platform 60 further includes a limiting strip 64, which is vertically disposed on the base plate 61 and extends along the length of the base plate 61. The limiting strip 64 and the positioning plate 63 are respectively located on two sides of the base plate 61, with the limiting strip 64 disposed on the side facing the fixture mounting base 50. Two limiting strips 64 are provided, located on both sides of the width direction of the needle avoidance groove 62, and the distance between the mutually distant sides of the two limiting strips 64 is the same as the width of the second groove surface 512. The height of the limiting strip 64 is equal to the height from the first groove surface 511 to the second groove surface 512. During installation, the two limiting strips 64 are precisely engaged between the side walls on both sides of the second groove surface 512, so that the side surface of the base plate 61 is in contact with the first groove surface 511. The two limiting strips 64 further realize the center positioning between the measuring mounting platform 60 and the fixture mounting base 50. To further ensure measurement accuracy, the lengths of the two limit bars 64 are the same as the length of the base plate 61.

[0060] In this embodiment, to ensure that the measuring device can meet the measurement of different types of internal threaded holes 11 on the component 10 during the measurement process, the measuring mounting table 60 is provided with various different models. Different internal threaded holes 11 are positioned by changing different measuring mounting tables 60. The different models of measuring mounting tables 60 have the same size of base plate 61 and limit strip 64, which facilitates the fixed connection between the different models of measuring mounting tables 60 and the fixture mounting base 50. The limit strip 64 is also in the same position, so that the limit strip 64 is inserted into the second groove surface 512 to clamp the base plate 61 into the first groove surface 511. However, the groove width of the needle avoidance groove 62 and the size of the positioning plate 63 are different to accommodate different types of internal threaded holes 11.

[0061] like Figure 2 and Figure 4As shown, to facilitate the replacement of the corresponding measuring mounting platform 60 according to the size of the internal thread hole 11 to be measured, the measuring mounting platform 60 is preferably detachably mounted on the fixture mounting base 50. In this embodiment, at least two threaded holes 53 are provided on the clamping groove 51, and the threaded holes 53 are opened on the first groove surface 511. Correspondingly, at least two screw holes 65 are opened on the base plate 61, and the screw holes 65 are opened on the outer side of the positioning plate 63 on the corresponding side. The base plate 61 is fixedly connected to the fixture mounting base 50 by at least two screws, thereby fixing the measuring mounting platform 60 on the fixture mounting base 50. This facilitates disassembly and assembly, while ensuring a firm installation between the measuring mounting platform 60 and the fixture mounting base 50, making the base plate 61 and the fixture mounting base 50 a whole, and ensuring the accuracy of the measurement position and measurement value.

[0062] In this embodiment, during measurement, the fixture mounting base 50 is mounted on the host 20, and the measuring mounting platform 60, which matches the internal thread hole 11 to be measured, is mounted on the fixture mounting base 50. The measuring rod 31 and the measuring needle 32 pass through the first clearance groove 52 on the fixture mounting base 50 and the needle clearance groove 62 on the measuring mounting platform 60 in sequence. Then, the whole assembly is placed at the internal thread hole 11 on the large track component 10. At this time, the center line of the first clearance groove 52 is parallel to the diameter of the internal thread hole 11. The measuring personnel press the operation button 22 on the host 20 to drive the measuring rod 31 and the measuring needle 32 to move along the X-axis and Z-axis directions and extend into the internal thread hole 11 to scan the thread image.

[0063] During the movement of the probe 32, the thread image of the internal threaded hole 11 scanned is transmitted to the computer. The obtained scanned image is a thread planar diagram. Both sides of the thread are scanned, and the entire thread path is displayed in the computer software. The software can directly calculate and measure various dimensions of the graphic, thereby directly obtaining parameters such as the thread angle, thread half angle, and pitch of the internal threaded hole 11. The parameter measurement is more accurate, measuring many more parameters than commonly used go and no-go gauges. At the same time, the scanned image can also better determine the condition of the internal threaded hole, clarifying whether it is worn, whether the bolt will strip after installation, etc.

[0064] The measuring device provided in this embodiment allows for simple grouping of the probe assembly 30 and the measuring mounting table 60 for different series of hole diameters. For example, one model of probe assembly 30 and measuring mounting table 60 can be selected for internal thread holes 11 with diameters of 6 to 24 mm, and another model of probe assembly 30 and measuring mounting table 60 can be selected for internal thread holes 11 with diameters of 24 to 80 mm. Measurement can be completed without changing the probe assembly 30 and measuring mounting table 60 for each specification. This solves the problem in the prior art that a different go / no-go gauge needs to be configured for each specification (6 mm, 8 mm, 10 mm, 12 mm, etc.), greatly reducing the number of operations and realizing automated and electronic measurement, making operation very convenient.

[0065] like Figure 6 As shown in this embodiment, in order to ensure the accuracy of the measurements by the measuring rod 31 and the probe 32, it is necessary to define the calibration value M between the two probes 32. Therefore, this embodiment also includes a calibration device for use when calibrating the measuring device.

[0066] like Figure 6 As shown, in this embodiment, the calibration device includes a calibration datum gauge 70, which is a ring with a flat end face. The calibration datum gauge 70 has a central hole 71, the diameter of which coincides with the centerline of the first clearance groove 52. The calibration datum gauge 70 is fitted on the outside of the probe assembly 30, and the standard diameter of the central hole 71 of the calibration datum gauge 70 is m.

[0067] During the calibration process, the probe assembly 30 is adjusted so that the two probes 32 contact the two ends of the diameter of the center hole 71 respectively, and two measurement values ​​m1 and m2 are obtained respectively. The standard diameter m of the center hole 71 of the calibration base gauge 70 is subtracted from the two measurement values ​​m1 and m2, and the difference is the calibration value M.

[0068] In this embodiment, to facilitate the installation of the calibration datum gauge 70 on the host 20, it is further preferred that the calibration datum gauge 70 be installed on the host 20 via an adjustment mounting base 80. Furthermore, for ease of assembly and disassembly, the adjustment mounting base 80 is detachably mounted on a clamp mounting base 50 on one side of the host 20. Specifically, the adjustment mounting base 80 is fixedly installed in the clamping groove 51. The structure of the adjustment mounting base 80 is similar to that of the measuring mounting platform 60. The adjustment mounting base 80 also has a base plate 81, on which a second clearance groove 82 is formed. The measuring rod 31 and the measuring stylus 32 pass through the second clearance groove 82. The width of the base plate 81 of the adjustment mounting base 80 is the same as the width of the base plate 61 of the measuring mounting platform 60, facilitating disassembly after installation and adjustment. The width of the second clearance groove 71 is the same as the width of the first clearance groove 52, and the openings of the first clearance groove 52 and the second clearance groove 71 are aligned with each other. The side of the adjustment mounting base 80 is higher than the side of the clamp mounting base 50. During calibration, the calibration datum gauge 6 is installed on one side of the adjustment mounting base 80. A limit strip (not shown in the figure) is also provided on the other side of the adjustment mounting base 80, which has the same function as the limit strip 64 on the measuring mounting table 60.

[0069] like Figure 7 As shown, this embodiment also provides a method for measuring all parameters of an internal threaded hole in a component, which specifically includes the following steps:

[0070] S10. Control the probe assembly 30 to extend axially into the internal threaded hole 11, control the probe 32 in the probe assembly 30 to move to one side of the internal threaded hole 11, so that the probe 32 contacts the tooth groove or tooth tip of the internal threaded hole 11, and moves from the first depth h1 to the second depth h2. During the movement, a contact scan is performed, and the scan result is transmitted to the processing terminal.

[0071] S20. Control the probe 32 to move to the other side of the diameter direction of the internal threaded hole 11, so that the probe 32 contacts the tooth groove or tooth tip on the other side of the internal threaded hole 11, and moves in the opposite direction from the second depth h2 to the first depth h1. During the movement, a contact scan is performed, and the scan result is transmitted to the processing terminal.

[0072] S30. In the processing terminal 40, the scanned image is unfolded, and the required measurement parameters for the internal threaded hole are measured and calculated directly on the scanned image according to the parameter definition.

[0073] Step S10 above also includes the following steps:

[0074] S11. The measuring mounting table 60, which matches the internal thread hole 11 to be tested, is installed on the fixture mounting base 50. At this time, the two limiting strips 64 are just stuck between the side walls on both sides of the second groove surface 512. The side surface of the base plate 61 is attached to the first groove surface 511. The screw passes through the screw hole 65 of the base plate 61 and locks with the thread hole 53 on the clamping groove 51. At this time, the main unit 20, the fixture mounting base 50 and the measuring mounting table 60 are connected into a whole detection unit.

[0075] S12. Position the positioning plate 63 on the measuring mounting table 60 toward the internal threaded hole 11 of the component 10, that is, the base plate 61 of the measuring mounting table 60 is attached to the surface of the component 10, and the positioning plate 63 extends into its internal threaded hole 11. Adjust the position so that one side of the two positioning plates 63 simultaneously contacts the internal threaded hole 11. At this time, the central axis of the first clearance groove 52 and the central axis of the internal threaded hole 11 are located in the same vertical plane.

[0076] S13. Connect the host 20 to the power supply and connect it to the computer of the processing terminal 40 via the communication cable. Start the host 20 and press the "down" operation button 22. After signal conversion, the probe 32 will move along the axis of the internal threaded hole 11, moving downward from the initial position and extending into the internal threaded hole 11 to a first depth h1. Then press the "left" or "right" operation button 22 to move the probe 31 along the length of the first clearance groove 52 until the probe 32 contacts the left side of the internal threaded hole 11 (e.g., ...). Figure 7(as shown in the image) or the alveolar bone or cusp on the right side, continue to control the probe 32 to move downwards until it reaches the second depth h2. During the movement, a contact scan is performed, and the signal is converted into an electrical signal and transmitted to the computer. The scan on the left or right side is completed.

[0077] During measurement, the measuring personnel can define the measurement depth according to the measurement needs, that is, set the first depth h1 and the second depth h2, and input it through the computer. After input, the host 20 automatically controls the movement stroke of the probe 32. For example, the position of the first tooth groove or tooth tip in the internal thread hole 11 can be set as the first depth h1, and the position of the last tooth groove or tooth tip can be set as the second depth h2.

[0078] Step S20 above also includes the following steps:

[0079] S21. Press the "Right" or "Left" operation button 22 to move the probe 31 in the opposite direction along the length of the first clearance groove 52 until the probe 32 contacts the right side of the internal threaded hole 11 (e.g., Figure 7 The probe 32 is controlled to move upwards until it reaches the first depth h1 at the position shown in the figure (or the alveolar bone or cusp on the left). During the movement, a contact scan is performed, and the signal is converted into an electrical signal and transmitted to the computer. The scan on the right or left side is completed.

[0080] S22. Press the "left" or "right" operation button 22 to move the probe 31 along the length of the first clearance groove 52 to the center position and then move it upward until the probe 32 returns to the initial position, thus completing the detection of an internal thread hole 11.

[0081] After completing the scanning of one internal threaded hole 11, the measuring personnel can move the main unit 20 to the position of the next internal threaded hole 11 to inspect the next internal threaded hole 11. The inspection steps are the same as those described above.

[0082] like Figure 6 As shown, in this embodiment, to ensure measurement accuracy, a step of calibrating the probe assembly 30 is included before measurement. The calibration value M is the distance between the two probes 32, specifically including:

[0083] S01. Set the calibration datum gauge 70 on the outside of the probe assembly 30.

[0084] S02. The calibration datum gauge 70 has a center hole 70. The diameter of the center hole 70 of the calibration datum gauge 70 is the standard diameter m. The control probe 32 moves along the diameter direction of the calibration datum gauge 70 until it contacts both ends of the diameter of the calibration datum gauge 70. The measured values ​​are m1 and m2 respectively. The calibration value M = m - m1 - m2.

[0085] Step S01 above also includes the following steps:

[0086] S011. Install the calibration base gauge 70 on the adjustment mounting base 80, and then install the adjustment mounting base 80 into the clamping groove 51 of the clamp mounting base 50, so that the calibration base gauge 70 on the adjustment mounting base 80 is fitted on the outside of the probe assembly 30.

[0087] S012. Connect the host 20 to the power supply and connect it to the computer of the processing terminal through the communication cable. At this time, the probe 31 is located at the center of the calibration base gauge 70, and the probe 32 does not exceed the surface of the fixture mounting base 50, which is the initial position.

[0088] Step S02 above also includes the following steps:

[0089] S021. Press the "down" operation button 22 to move the probe 32 along the central axis of the calibration datum gauge 70 into the central hole 71 of the calibration datum gauge 70.

[0090] S022. Press the "left" and "right" operation buttons 22 to move the probe 31 along the diameter direction of the calibration base gauge 70 (i.e., the straight line connecting the two probes 32) until it contacts both ends of the diameter of the calibration base gauge 70. At this time, the measured values ​​displayed on the computer are m1 and m2 respectively. The calibration value M = m - m1 - m2. The calibration value M obtained in this way is the distance between the two probes 32.

[0091] The present invention has the following advantages:

[0092] (1) This invention utilizes a contact scanning probe assembly to scan a thread image of a certain length. The processing terminal directly measures and calculates all the parameters required to be measured for the internal thread hole from the graphic image according to the definition of each parameter. Not only is the operation simple and convenient, but the method of obtaining parameters is also simple, direct and accurate, realizing the full parameter measurement of the internal thread hole, such as the tooth profile angle, tooth profile half angle, pitch, large, medium and small diameters, and working diameter.

[0093] (2) This invention solves the problem that specific parameters of internal threaded holes for large rail vehicle parts cannot be measured in the prior art. It also solves the problem that the go / no-go gauge in the prior art cannot measure the full parameters of internal threaded holes, such as tooth profile angle, tooth profile half angle, pitch, major, minor and major diameters, and working pitch diameter, and can only simply judge whether the thread is qualified.

[0094] (3) For different series of specifications of aperture, the present invention can complete the measurement without changing the probe assembly and the measuring mounting table. It can be done simply by changing the probe assembly and the measuring mounting table in groups. It does not require each specification to be equipped with a go / no-go gauge, which reduces the number of operations and realizes automated and electronic measurement, which is very convenient.

[0095] (4) The calibration method of the present invention is simple. It only requires the probe to contact the left and right sides of the ring gauge, and the probe can be calibrated by subtracting the side values ​​from the diameter of the standard ring gauge.

[0096] (5) The present invention has a fixture mounting base and a measuring mounting table installed on the host, and the fixture mounting base has a stepped groove surface. The fixture structure is adapted to portable measuring host and has better versatility, making it convenient to measure internal thread holes of different models.

[0097] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. The implementation schemes in the above embodiments can be further combined or replaced. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A device for measuring all parameters of an internal threaded hole in a component, characterized in that: The device includes a handheld host, a contact scanning stylus assembly, and a processing terminal. One end of the stylus assembly is connected to the host, and the other end of the stylus assembly extends into the internal thread hole to scan the internal thread. The host controls the movement of the stylus assembly, and the processing terminal is communicatively connected to the host. The processing terminal collects and processes the thread image data acquired by the stylus assembly to obtain thread parameters. The probe assembly includes a probe rod and a probe. The host includes a housing, which is rectangular in shape. A data acquisition unit, a motion control component, and a communication unit are installed inside the housing. One end of the probe rod is fixedly connected to the motion control component. The host drives the probe to move along the X-axis and Z-axis. A clamp mounting base and a measuring mounting platform are installed on the host machine. The clamp mounting base is installed on the host machine, and the measuring mounting platform is detachably installed on the clamp mounting base. The probe passes through the clamp mounting base and the measuring mounting platform and then extends into the internal threaded hole. The fixture mounting base is a cuboid in shape, and its outer contour is adapted to the outer shell of the main unit. After installation, the fixture mounting base forms an integral part with the main unit. The fixture mounting base is provided with a clamping groove, which is located on the surface of the fixture mounting base opposite to the main unit. The measuring mounting stage is fixed in the clamping groove. A first clearance groove for the probe assembly to pass through is provided on the groove surface of the clamping groove. The first clearance groove is located on the center line of the fixture mounting base. The first clearance groove is an elongated through groove and extends along the X-axis moving direction of the probe assembly. The length of the first clearance groove is greater than the maximum stroke of the probe on the X-axis. The clamping groove is a stepped groove. The clamping groove has a first groove surface and a second groove surface. The groove width of the first groove surface is greater than that of the second groove surface. The first clearance groove is located on the second groove surface, and the groove width of the second groove surface is greater than that of the first clearance groove. The measuring mounting platform includes a base plate, which has a rectangular parallelepiped structure. During installation, the base plate is sandwiched between the two side walls of the first groove surface, and the side surface of the base plate is in contact with the first groove surface. The center line of the base plate and the center line of the clamping groove are located in the same vertical plane. During measurement, the outer surface of the base plate abuts against the surface of the component with the internal threaded hole. A needle avoidance groove for the probe assembly to pass through is formed on the base plate. The needle avoidance groove is located on the center line of the base plate and corresponds to the first clearance groove. The needle avoidance groove is an elongated through groove and extends along the X-axis movement direction of the probe assembly. The length and width of the needle avoidance groove and the first clearance groove are the same. Two positioning plates are vertically arranged on the base plate. The positioning plates are located on both sides of the needle avoidance groove and are set at the center position of the base plate in the length direction. During measurement, the two positioning plates are inserted into the internal threaded hole and contact the inner surface of the internal threaded hole to achieve positioning.

2. The device for measuring all parameters of internal threaded holes in components according to claim 1, characterized in that: The probe is vertically fixed to the other end of the probe rod.

3. The device for measuring all parameters of internal threaded holes in components according to claim 2, characterized in that: Two probes are symmetrically arranged at the end of the probe rod, and the included angle between the two probes is 180°.

4. The device for measuring all parameters of internal threaded holes in components according to claim 1, characterized in that: An operation button is provided on the casing of the main unit, and the operation button is used to drive the probe assembly to perform actions.

5. The device for measuring all parameters of internal threaded holes in components according to claim 1, characterized in that: Two limiting strips are provided on the other side of the base plate away from the positioning plate for positioning with the center of the clamp mounting seat. The limiting strips are provided on both sides of the needle avoidance groove.

6. The device for measuring all parameters of internal threaded holes in components according to any one of claims 1-5, characterized in that: The measuring device also includes a calibration datum gauge for calibrating the probe assembly. The calibration datum gauge is a ring with a flat end face and a central hole. The calibration datum gauge is fitted onto the outside of the probe assembly.

7. The device for measuring all parameters of internal threaded holes in components according to claim 6, characterized in that: The calibration base gauge is mounted on the main unit via an adjustment mounting base, which is detachably mounted on the main unit. The adjustment mounting base is provided with a second clearance groove for the probe assembly to pass through.

8. A measurement method for a full parameter measuring device for internal threaded holes of components as described in any one of claims 1-7, characterized in that, Includes the following steps: S10. Control the probe assembly to extend into the internal threaded hole along the axial direction of the internal threaded hole, control the probe in the probe assembly to move to one side of the internal threaded hole, so that the probe contacts the tooth groove or tooth tip of the internal threaded hole, and moves from the first depth h1 to the second depth h2. During the movement, a contact scan is performed, and the scan result is transmitted to the processing terminal. S20. Control the probe to move to the other side of the internal thread hole diameter direction, so that the probe contacts the tooth groove or tooth tip on the other side of the internal thread hole, and moves in the opposite direction from the second depth h2 to the first depth h1. During the movement, a contact scan is performed, and the scan result is transmitted to the processing terminal. S30. In the processing terminal, the scanned image is expanded, and the required measurement parameters for the internal threaded hole are directly measured and calculated on the scanned image according to the parameter definition.

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