Thread pitch diameter measuring device and measuring method

Abstract

The invention discloses a thread pitch diameter measuring device and method, and belongs to the technical field of thread part detection, the thread pitch diameter measuring device comprises a base, a projection lamp mechanism, a lifting assembly and limiting supporting assemblies, and the limiting supporting assemblies are arranged on the two sides of the base; the projection lamp mechanism is connected with the lifting assembly and comprises a projection lamp, a lampshade, a supporting frame and a light gathering assembly, the lampshade is arranged at the top of the projection lamp, the light gathering assembly is used for defining a light gathering channel on the outer side of the projection lamp, and the light gathering channel is used for gathering light of the projection lamp and vertically irradiating the light downwards; the lampshade is further used for pushing the light gathering assembly to expand or contract when driven by the lifting assembly to ascend and descend so as to adjust the size of the light gathering channel. According to the invention, the clamping of the to-be-measured part is conveniently realized through the limiting and supporting assembly, and the lifting assembly drives the projection lamp mechanism to carry out fine height adjustment, so that the high-precision projection irradiation measurement requirements of to-be-measured parts with different sizes are met.

Description

Technical Field

[0001] The present application relates to the technical field of threaded parts detection, and in particular, to a thread pitch diameter measuring device. In addition, the present application also relates to a thread pitch diameter measuring method including the thread pitch diameter measuring device. Background Art

[0002] The information provided in this section is for the purpose of generally presenting the background of the present application. To the extent described in this section, the work of the presently named inventors and aspects of the description that may not constitute prior art at the time of filing are neither explicitly nor implicitly admitted to be prior art to the present application.

[0003] The thread pitch diameter is a virtual dimension, and most dimensions in thread measurement elements are related to the thread pitch diameter, such as the thread pitch diameter value, thread verticality, thread runout, etc.

[0004] In the existing technology, there are two main methods for thread detection: contact and non-contact. The contact detection method mainly includes comprehensive measurement method (such as gauge measurement) and single measurement method (such as three-needle measurement); the non-contact method mainly detects through thread image information, including tool microscope method and machine vision detection method. Among them, machine vision detection technology has the advantages of non-contact and high precision.

[0005] However, the existing machine vision system for thread measurement of threaded parts is expensive and difficult to effectively improve the efficiency, which cannot meet the requirements of high-efficiency detection of large quantities of threaded parts. At the same time, there are also problems such as the trouble of clamping the parts to be tested, and the height of the projection lamp is difficult to adjust, making it difficult to adapt to the detection of parts of different sizes.

[0006] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0007] In view of at least one of the above technical problems, the present application provides a thread center diameter measuring device, which can conveniently realize the clamping of the part to be measured through a limit support assembly, and drive the projection lamp mechanism to perform fine height adjustment through a lifting assembly to adapt to the high-precision projection illumination measurement requirements of parts to be measured of different sizes.

[0008] At the same time, the present application also provides a thread pitch diameter measuring method including the above-mentioned thread pitch diameter measuring device.

[0009] According to one aspect of the present application, a thread diameter measuring device is provided, including a base, a projection lamp mechanism, a lifting assembly, and a limit support assembly:

[0010] The limit support components are arranged on both sides of the base, and the limit support components are used to support the limit position of the parts to be tested;

[0011] The lifting assembly is arranged on the base, the projection lamp mechanism is connected to the lifting assembly, the lifting assembly is used to drive the projection lamp mechanism to lift, the projection lamp mechanism is used to vertically illuminate the part to be tested to form a projection view, the projection lamp mechanism includes a projection lamp, a lampshade, a support frame and a focusing assembly, the projection lamp is connected to the lifting assembly through a second connecting rod, a lampshade is arranged on the top of the projection lamp, the lampshade is used to shield and protect the top of the projection lamp and to gather the light of the projection lamp downward, the support frame is supported on the base, the support frame is used to support the focusing assembly, the focusing assembly is used to enclose the outside of the projection lamp to form a focusing channel, the focusing channel is used to gather the light of the projection lamp and irradiate vertically downward, and the lampshade is also used to push the focusing assembly to expand or contract when driven by the lifting assembly to lift, so as to adjust the size of the focusing channel.

[0012] In some embodiments of the present application, the projection lamp mechanism also includes a first locking piece and a support plate assembly, the support plate assembly is supported and fixed by a support frame, the focusing assembly includes a first focusing cover and a second focusing cover symmetrically arranged, the first focusing cover and the second focusing cover are respectively movably arranged on both sides of the support plate assembly and are used to enclose with the support plate assembly on the outside of the projection lamp to form a focusing channel, the first focusing cover and the second focusing cover are both provided with a first connecting rod on the inner side, the tail end of the first connecting rod is connected to the first locking piece, the first locking piece is used to abut against the outer wall of the lampshade, and the lampshade is used to push the first locking pieces on both sides to move in the horizontal direction during the lifting process, thereby pushing the first focusing cover and the second focusing cover to move in the horizontal direction to adjust the size of the focusing channel.

[0013] In some embodiments of the present application, the lampshade is a frustum structure that is narrow at the top and wide at the bottom, and the side wall of the first locking member that contacts and fits with the outer wall of the lampshade is a slope structure.

[0014] In some embodiments of the present application, the support plate assembly includes a first support plate and a second support plate symmetrically arranged, the first focus cover and the second focus cover are both arc-shaped plate structures, the first focus cover and the second focus cover are combined with the first support plate and the second support plate to form a focusing channel, first limiting grooves are opened on the side walls on both sides of the first focus cover, and second limiting grooves are opened on the side walls on both sides of the second focus cover, the first limiting grooves on both sides are respectively used to limit the first ends of the first support plate and the second support plate, and the second limiting grooves on both sides are respectively used to limit the second end of the second support plate, a limiting spring is arranged between the first focus cover and the second focus cover, and the first support plate is connected to the top of the support frame.

[0015] In some embodiments of the present application, the limit support assembly includes a first limit member and a second limit member symmetrically arranged, a mounting frame is arranged on the base, the first limit member and the second limit member are hinged to the mounting frame at the same time, the first limit member and the second limit member are used to support and limit the part to be measured, and the thread center diameter measuring device also includes a clamping limit mechanism, which is used to clamp and limit the two ends of the part to be measured.

[0016] In some embodiments of the present application, the clamping and limiting mechanism includes a sliding shaft, a supporting tube, a pushing assembly and a clamping plate. The supporting tube is arranged on a base, the sliding shaft is arranged in the supporting tube for sliding along the axial direction of the part to be measured, the clamping plate is arranged on the side of the sliding shaft close to the end face of the part to be measured, and the pushing assembly is used to connect the first limiting member and the sliding shaft, and then when the part to be measured presses down the first limiting member, the sliding shaft is pushed to move and drive the clamping plate to clamp and limit the end face of the part to be measured.

[0017] In some embodiments of the present application, the pushing assembly includes a compression spring, a second locking member and a pushing member. The second locking member is arranged on the sliding shaft and the compression spring is pressed between the second locking member and the support tube. The pushing member is arranged at the bottom of the first limiting member. The pushing member is used to abut against the side wall of the second locking member, and when the first limiting member rotates around its hinge point, the second locking member is pushed by the pushing member to move axially along the support tube, thereby driving the sliding shaft and the clamping plate to clamp and limit the end face of the part to be measured.

[0018] In some embodiments of the present application, the side wall of the pushing member that abuts against the second locking member is a slope structure, and the side wall of the second locking member that abuts against the pushing member is a slope structure.

[0019] In some embodiments of the present application, the lifting assembly includes a slider, a screw rod and a guide rod, the screw rod and the guide rod are arranged on the base at intervals, the slider is sleeved on the screw rod and is connected to the screw rod by a thread, the guide rod runs through the slider, the guide rod is used to guide the slider, the slider, the projection lamp mechanism includes a second connecting rod, the first end of the second connecting rod is connected to the slider, the second end of the second connecting rod is connected to the projection lamp, and a hand wheel is arranged on the top of the screw rod.

[0020] According to another aspect of the present application, a thread pitch diameter measuring method is also provided, which uses the thread pitch diameter measuring device mentioned above, and the thread pitch diameter measuring method comprises the following steps:

[0021] S100, the part to be tested is supported and limited on the base by the limit support assembly, and the part to be tested is vertically illuminated by the projection lamp mechanism;

[0022] S200, obtaining a projection view of the part to be measured, and drawing thread projection straight lines L1, L2, L3, ..., L6 on the base;

[0023] S300, extending the thread projection lines L1 and L2 to obtain an intersection A; extending the thread projection lines L2 and L3 to obtain an intersection D; extending the thread projection lines L3 and L4 to obtain an intersection B; extending the thread projection lines L4 and L5 to obtain an intersection E; and extending the thread projection lines L5 and L6 to obtain an intersection C;

[0024] S400, connect the intersection points A, B, and C to fit a straight line L7, and connect the intersection points D and E to fit a straight line L8; draw the midline of the straight line L7 and the straight line L8 to obtain a thread mid-diameter line L9 on one side;

[0025] S500, the thread mid-warp L10 on the other side can be obtained in the same way.

[0026] This application has the following beneficial effects:

[0027] The present application discloses a threaded diameter measuring device that supports and limits the part to be measured by means of a limiting support assembly, vertically illuminates the part to be measured by means of a projection lamp mechanism to form a projection view, and drives the projection lamp mechanism to be raised and lowered by means of a lifting assembly to meet different projection illumination requirements. A focusing assembly is arranged on the outside of the projection lamp mechanism, and the focusing assembly is enclosed on the outside of the projection lamp to form a focusing channel, and the focusing channel gathers the light of the projection lamp and irradiates vertically downward. When the projection lamp and the lampshade are raised and lowered, the focusing assembly can be pushed by the lampshade to expand or contract, so as to adjust the size of the focusing channel, so as to meet the projection illumination requirements of parts to be measured of different sizes. That is, when the diameter of the part to be measured is large, the focusing assembly can be driven to expand by raising the projection lamp mechanism to expand the focusing channel, thereby expanding the illumination range; when the part to be measured is small in size and requires a stronger illumination light intensity, the projection lamp mechanism can be lowered and the focusing assembly can be driven to contract, so as to form a clearer projection view of the part to be measured.

[0028] The thread mean diameter measurement method of the present application also has the above-mentioned beneficial effects. It also includes the use of optical methods, using the definition method to simulate the thread mean diameter line on the optical projection image, so as to obtain the thread-related elements that need to be measured. A light projector is used to obtain a thread projection view, and the major and minor diameter lines of the thread are obtained by a special point fitting method. The midline of the major meridian and the minor diameter line is drawn to obtain the thread mean diameter line, and the virtual and abstract thread mean diameter is materialized. Not only can the specific value of the thread mean diameter be measured, but also the actual processing status of the thread can be reflected, which is suitable for high-precision aircraft engine thread parts inspection scenarios.

[0029] Of course, any product implementing this application does not necessarily need to achieve all the advantages described above at the same time. In addition to the purposes, features and advantages described above, this application also has other purposes, features and advantages. The following will further describe this application in detail with reference to the figures. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0031] Figure 1 This is a schematic diagram of the thread median diameter obtained by fitting in the preferred embodiment of the present application;

[0032] Figure 2 It is a schematic diagram of the thread pitch diameters on both sides of the part to be tested in the preferred embodiment of the present application;

[0033] Figure 3 It is a schematic diagram of the overall structure of the measuring device of the preferred embodiment of the present application;

[0034] Figure 4 is a structural schematic diagram of a projection lamp mechanism in a preferred embodiment of the present application;

[0035] Figure 5 is a schematic diagram of the installation of the support plate assembly of the preferred embodiment of the present application;

[0036] Figure 6 It is a structural schematic diagram of a clamping and limiting assembly of a preferred embodiment of the present application;

[0037] Figure 7 It is a structural schematic diagram of a focusing assembly in a preferred embodiment of the present application;

[0038] Figure 8 This is a schematic structural diagram of a second clamping member in a preferred embodiment of the present application;

[0039] Fig. 9 It is a schematic diagram of the structure of the pusher of the preferred embodiment of the present application;

[0040] Legend: 1. Base; 2. Projector mechanism; 21. Light projector; 22. Lamp cover; 23. First connecting rod; 24. First locking member; 25. Focusing assembly; 251. First focusing cover; 252. Second focusing cover; 26. Support plate assembly; 261. First supporting plate; 262. Second supporting plate; 27. Second connecting rod; 3. Lifting assembly; 31. Sliding block; 32. Screw rod; 33. Guide rod; 34. Hand wheel; 4. Limit support assembly; 41. First limit support member; 42. Second limit support member; 5. Pressing limit mechanism; 51. Sliding shaft; 52. Support cylinder; 53. Compression spring; 54. Second locking member; 55. Pushing member; 56. Pressing plate; 6. Support frame; 7. Mounting frame. DETAILED DESCRIPTION

[0041] The embodiments of the present application are described in detail below in conjunction with the accompanying drawings, but the present application can be implemented in a variety of different ways defined and covered below.

[0042] Figure 1 This is a schematic diagram of the thread median diameter obtained by fitting in the preferred embodiment of the present application; Figure 2 It is a schematic diagram of the thread pitch diameters on both sides of the part to be tested in the preferred embodiment of the present application; Figure 3 It is a schematic diagram of the overall structure of the measuring device of the preferred embodiment of the present application; Figure 4 is a structural schematic diagram of a projection lamp mechanism in a preferred embodiment of the present application; Figure 5 is a schematic diagram of the installation of the support plate assembly of the preferred embodiment of the present application; Figure 6 It is a structural schematic diagram of a clamping and limiting assembly of a preferred embodiment of the present application; Figure 7 It is a structural schematic diagram of a focusing assembly in a preferred embodiment of the present application; Figure 8 This is a schematic structural diagram of a second clamping member in a preferred embodiment of the present application; Fig. 9 It is a schematic diagram of the structure of the pusher of the preferred embodiment of the present application.

[0043] A thread diameter measuring device includes a base 1, a projection lamp mechanism 2, a lifting assembly 3 and a limit support assembly 4:

[0044] The position limiting support assembly 4 is arranged on both sides of the base 1, and the position limiting support assembly 4 is used to support and limit the part to be measured;

[0045] The lifting assembly 3 is arranged on the base 1, and the projection lamp mechanism 2 is connected to the lifting assembly 3. The lifting assembly 3 is used to drive the projection lamp mechanism 2 to lift and lower. The projection lamp mechanism 2 is used to vertically illuminate the part to be tested to form a projection view. The projection lamp mechanism 2 includes a projection lamp 21, a lampshade 22, a support frame 6 and a focusing assembly 25. The projection lamp 21 is connected to the lifting assembly 3 through a second connecting rod 27. A lampshade 22 is arranged on the top of the projection lamp 21. The lampshade 22 is used to shield and protect the top of the projection lamp 22 and to gather the light of the projection lamp 21 downward. The support frame 6 is supported on the base 1. The support frame 6 is used to support the focusing assembly 25. The focusing assembly 25 is used to enclose the outer side of the projection lamp 21 to form a focusing channel. The focusing channel is used to gather the light of the projection lamp 21 and irradiate vertically downward. The lampshade 22 is also used to push the focusing assembly 25 to expand or contract when it is driven by the lifting assembly 3 to lift and lower, so as to adjust the size of the focusing channel.

[0046] The present application discloses a threaded diameter measuring device, which supports and limits the part to be measured by means of a position-limiting support component 4, vertically illuminates the part to be measured by means of a projection lamp mechanism 2 to form a projection view, and drives the projection lamp mechanism 2 to be raised and lowered by means of a lifting component 3 to meet different projection illumination requirements. A focusing component 25 is arranged outside the projection lamp mechanism 2, and the focusing component 25 is enclosed outside the projection lamp 21 to form a focusing channel, and the focusing channel gathers the light of the projection lamp 21 and vertically illuminates downward. When the projection lamp 21 and the lampshade 22 are raised and lowered, the focusing component 25 can be pushed by the lampshade 22 to expand or contract, so as to adjust the size of the focusing channel, so as to meet the projection illumination requirements of parts to be measured of different sizes. That is, when the diameter of the part to be measured is large, the focusing component 25 can be driven to expand by raising the projection lamp mechanism 2 to expand the focusing channel, thereby expanding the illumination range; when the size of the part to be measured is small, a stronger illumination light intensity is required, and the projection lamp mechanism 2 can be lowered and the focusing component 25 can be driven to contract, so as to form a clearer projection view of the part to be measured.

[0047] Preferably, please refer to Figure 3 , 4 As shown in , 5, the projection lamp mechanism 2 also includes a first locking member 24 and a support plate assembly 26, the support plate assembly 26 is supported and fixed by the support frame 6, the focusing assembly 25 includes a first focusing cover 251 and a second focusing cover 252 which are symmetrically arranged, the first focusing cover 251 and the second focusing cover 252 are respectively movably arranged on both sides of the support plate assembly 26 and are used to enclose with the support plate assembly 25 on the outside of the projection lamp 21 to form a focusing channel, the first focusing cover 251 and the second focusing cover 252 are both provided with a first connecting rod 23 on the inner side, the tail end of the first connecting rod 23 is connected to the first locking member 24, the first locking member 24 is used to abut against the outer wall of the lampshade 22, and the lampshade 22 is used to push the first locking members 24 on both sides to move in the horizontal direction during the lifting process, thereby pushing the first focusing cover 251 and the second focusing cover 252 to move in the horizontal direction to adjust the size of the focusing channel.

[0048] Specifically, the lampshade 22 is a frustum structure that is narrow at the top and wide at the bottom, and the side wall of the first locking member 24 that contacts and fits with the outer wall of the lampshade 22 is a slope structure.

[0049] It is understandable that, by movably setting the first condenser 251 and the second condenser 252 on both sides of the support plate assembly 26, they can be enclosed with the support plate assembly 25 on the outside of the projection lamp 21 to form a condenser channel, so that the light of the projection lamp 21 can be vertically gathered downward for irradiation, which is conducive to improving the intensity of the light and avoiding the light tilt affecting the effect of the projection view. And the first condenser 251 and the second condenser 252 are movably set, so the size of the condenser channel can be adjusted to adjust the irradiation range of the light to meet the measurement needs of parts to be measured of different sizes.

[0050] When the lampshade 22 rises, the side wall of the lampshade 22 pushes the first locking member 24 to move in the horizontal direction, which can push the first focusing cover 251 and the second focusing cover 252 to move in the horizontal direction to adjust the size of the focusing channel. At this time, the support plate assembly 26 also plays a role in limiting the first focusing cover 251 and the second focusing cover 252.

[0051] Preferably, please refer to Figure 3 , 4 As shown in , 5, the support plate assembly 26 includes a first support plate 261 and a second support plate 262 which are symmetrically arranged. The first light focusing cover 251 and the second light focusing cover 252 are both arc-shaped plate structures. The first light focusing cover 251 and the second light focusing cover 252 are combined with the first support plate 261 and the second support plate 262 to form a focusing channel. First limiting grooves are provided on the side walls on both sides of the first light focusing cover 251, and second limiting grooves are provided on the side walls on both sides of the second light focusing cover 252. The first limiting grooves on both sides are respectively used to limit the first ends of the first support plate 261 and the second support plate 262, and the second limiting grooves on both sides are respectively used to limit the second ends of the second support plate 262. A limiting spring is provided between the first light focusing cover 251 and the second light focusing cover 252, and the first support plate 261 is connected to the top of the support frame 6.

[0052] It is understandable that the first condenser 251 and the second condenser 252, the first support plate 261 and the second support plate 262 can surround the projection lamp 21 to form a condensing channel, and the first condenser 251 and the second condenser 252 can be relatively displaced to adjust the size of the condensing channel. The limit spring between the first condenser 251 and the second condenser 252 can provide an elastic force to pull the first condenser 251 and the second condenser 252 closer, so as to achieve the reset of the two.

[0053] It should be noted that the first support plate 261 is supported and fixed by the support frame 6 , and the first support plate 261 and the second support plate 262 are connected by a connecting rod, which is beneficial to improving the overall stability of the support plate assembly 26 .

[0054] Preferably, please refer to Figure 3 , 6 As shown in Figures 8 and 9, the limit support assembly 4 includes a first limit member 41 and a second limit member 42 which are symmetrically arranged. A mounting frame 7 is arranged on the base 1. The first limit member 41 and the second limit member 42 are hinged to the mounting frame 7 at the same time. The first limit member 41 and the second limit member 42 are used to support and limit the part to be measured. The threaded middle diameter measuring device also includes a clamping limit mechanism 5, which is used to clamp and limit the two ends of the part to be measured.

[0055] Specifically, the clamping and limiting mechanism 5 includes a sliding shaft 51, a supporting tube 52, a pushing assembly and a clamping plate 56. The supporting tube 52 is arranged on the base 1, and the sliding shaft 51 is arranged in the supporting tube 52 to slide along the axial direction of the part to be measured. The clamping plate 56 is arranged on the side of the sliding shaft 51 close to the end face of the part to be measured. The pushing assembly is used to connect the first limiting member 41 and the sliding shaft 51, and then when the part to be measured presses down the first limiting member 41, the sliding shaft 51 is pushed to move and drive the clamping plate 56 to clamp and limit the end face of the part to be measured.

[0056] Optionally, the first limiter 41 and the second limiter 42 are both hinged to the mounting frame 7 through a torsion spring. The first limiter 41 and the second limiter 42 are symmetrically inclined, and their bottoms are close to each other in a V shape to better adapt to the limit support of parts to be tested of different sizes.

[0057] It is understandable that the first limiter 41 and the second limiter 42 can be used to conveniently support and limit the part to be measured. The part to be measured only needs to be placed between the first limiter 41 and the second limiter 42. The part to be measured presses the first limiter 41 and the second limiter 42 downward at the same time by gravity. The first limiter 41 and the second limiter 42 are both rotated around their hinge points at a certain angle to stably support the part to be measured. At this time, since the two ends of the part to be measured are not limited, in order to improve the overall limit fixation of the part to be measured, the two ends of the part to be measured are pressed and limited by the clamping limit assembly 5, which can ensure the stability of the part to be measured during the measurement process, which is conducive to improving the measurement accuracy.

[0058] Preferably, please refer to Figure 8 , 9 As shown, the pushing assembly includes a compression spring 53, a second locking member 54 and a pushing member 55. The second locking member 54 is arranged on the sliding shaft 51, and the compression spring 53 is pressed between the second locking member 54 and the support tube 52. The pushing member 55 is arranged at the bottom of the first limiting member 41. The pushing member 55 is used to abut against the side wall of the second locking member 54, and when the first limiting member 41 rotates around its hinge point, the second locking member 54 is pushed by the pushing member 55 to move axially along the support tube 52, thereby driving the sliding shaft 51 and the clamping plate 56 to clamp and limit the end face of the part to be measured.

[0059] Specifically, the side wall of the pushing member 55 that abuts against the second locking member 54 is a slope structure, and the side wall of the second locking member 54 that abuts against the pushing member 55 is a slope structure.

[0060] It is understandable that when the part to be measured is placed between the first limit member 41 and the second limit member 42, the first limit member 41 is pressed downward to rotate around the hinge point by a certain angle, and the first limit member 41 can drive the pushing member 55 to squeeze and push the second clamping member 54, and push the second clamping member 54 and the sliding shaft 51 along the axial direction of the support tube 52, thereby driving the clamping plate 56 to move synchronously and clamp and limit the end face of the part to be measured. Since the limit support assembly 4 and the clamping limit assembly 5 are both symmetrically arranged, the clamping limit assemblies 5 on both sides can clamp and limit the two ends of the part to be measured at the same time, that is, when the part to be measured is placed on the limit support assembly 4, it is supported and limited by the limit support assembly 4 at the same time, and the clamping plate 56 clamps and fixes the two ends, so as to achieve a full range of limit and fixation, and ensure the stability of the part to be measured during the measurement process.

[0061] Preferably, please refer to Figure 3 As shown, the lifting assembly 3 includes a slider 31, a screw rod 32 and a guide rod 33. The screw rod 32 and the guide rod 33 are arranged on the base 1 at intervals. The slider 31 is sleeved on the screw rod 32 and is connected to the screw rod by a thread. The guide rod 33 runs through the slider 31. The guide rod 33 is used to guide the slider 31. The slider 31 and the projection lamp mechanism 2 include a second connecting rod 27. The first end of the second connecting rod 27 is connected to the slider 31, and the second end of the second connecting rod 27 is connected to the projection lamp 21. A hand wheel 34 is arranged on the top of the screw rod 32.

[0062] It can be understood that the slider 31 and the screw rod 32 form a screw-nut transmission mechanism. By turning the handwheel 34, the screw rod 32 can be driven to rotate, thereby driving the slider 31 to rise and fall along the guide rod 33. The slider 31 and the projection lamp 21 are connected by the second connecting rod 27 to achieve synchronous lifting and lowering movement of the two, so as to meet the irradiation requirements of parts to be measured of different sizes, which is conducive to improving the adaptability of the measuring device.

[0063] According to another aspect of the present application, a thread pitch diameter measuring method is also provided, which uses the thread pitch diameter measuring device mentioned above, and the thread pitch diameter measuring method comprises the following steps:

[0064] S100, the part to be tested is supported and limited on the base 1 by the limit support assembly 4, and the part to be tested is vertically illuminated by the projection lamp mechanism 2;

[0065] S200, obtaining a projection view of the part to be measured, and drawing thread projection straight lines L1, L2, L3, ..., L6 on the base 1;

[0066] S300, extending the thread projection lines L1 and L2 to obtain an intersection A; extending the thread projection lines L2 and L3 to obtain an intersection D; extending the thread projection lines L3 and L4 to obtain an intersection B; extending the thread projection lines L4 and L5 to obtain an intersection E; and extending the thread projection lines L5 and L6 to obtain an intersection C;

[0067] S400, connect the intersection points A, B, and C to fit a straight line L7, and connect the intersection points D and E to fit a straight line L8; draw the midline of the straight line L7 and the straight line L8 to obtain a thread mid-diameter line L9 on one side;

[0068] S500, the thread mid-warp L10 on the other side can be obtained in the same way.

[0069] The thread mean diameter measurement method of the present application also has the above-mentioned beneficial effects. It also includes the use of optical methods, using the definition method to simulate the thread mean diameter line on the optical projection image, so as to obtain the thread-related elements that need to be measured. A light projector is used to obtain a thread projection view, and the major and minor diameter lines of the thread are obtained by a special point fitting method. The midline of the major meridian and the minor diameter line is drawn to obtain the thread mean diameter line, and the virtual and abstract thread mean diameter is materialized. Not only can the specific value of the thread mean diameter be measured, but also the actual processing status of the thread can be reflected, which is suitable for high-precision aircraft engine thread parts inspection scenarios.

[0070] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0071] This article uses specific examples to illustrate the principles and implementation methods of this application. The above examples are only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection of this application.

Claims

1. A thread diameter measuring device, characterized in that: It comprises a base (1), a projection lamp mechanism (2), a lifting component (3) and a position limiting support component (4): The position limiting support components (4) are arranged on both sides of the base (1), and the position limiting support components (4) are used to support the position limiting parts to be measured; The lifting assembly (3) is arranged on the base (1), the projection lamp mechanism (2) is connected to the lifting assembly (3), the lifting assembly (3) is used to drive the projection lamp mechanism (2) to lift, the projection lamp mechanism (2) is used to vertically illuminate the part to be tested to form a projection view, the projection lamp mechanism (2) comprises a projection lamp (21), a lampshade (22), a support frame (6) and a focusing assembly (25), the projection lamp (21) is connected to the lifting assembly (3) via a second connecting rod (27), a lampshade (22) is arranged on the top of the projection lamp (21), and the lampshade (22) is provided on the top of the projection lamp (21). 2) used to shield and protect the top of the projection lamp (22) and to focus the light of the projection lamp (21) downwards, the support frame (6) is supported on the base (1), the support frame (6) is used to support the focusing assembly (25), the focusing assembly (25) is used to enclose the outside of the projection lamp (21) to form a focusing channel, the focusing channel is used to focus the light of the projection lamp (21) and irradiate vertically downwards, the lampshade (22) is also used to push the focusing assembly (25) to expand or contract when being driven by the lifting assembly (3) to move up and down, so as to adjust the size of the focusing channel.

2. A thread pitch diameter measuring device according to claim 1, characterized in that: The projection lamp mechanism (2) further comprises a first locking member (24) and a support plate assembly (26), wherein the support plate assembly (26) is supported and fixed by a support frame (6), and the focusing assembly (25) comprises a first focusing cover (251) and a second focusing cover (252) which are symmetrically arranged, wherein the first focusing cover (251) and the second focusing cover (252) are respectively movably arranged on both sides of the support plate assembly (26) and are used to enclose the support plate assembly (25) on the outside of the projection lamp (21) to form a focusing channel, and the first focusing cover (251) and the second focusing cover (252) are respectively movably arranged on both sides of the support plate assembly (26) and are used to enclose the support plate assembly (25) on the outside of the projection lamp (21) to form a focusing channel. A first connecting rod (23) is provided inside the first light collecting cover (251) and the second light collecting cover (252), and the tail end of the first connecting rod (23) is connected to the first locking piece (24), and the first locking piece (24) is used to abut against the outer wall of the lampshade (22). The lampshade (22) is used to push the first locking pieces (24) on both sides to move in the horizontal direction during the lifting process, thereby pushing the first light collecting cover (251) and the second light collecting cover (252) to move in the horizontal direction to adjust the size of the light collecting channel.

3. A thread pitch diameter measuring device according to claim 2, characterized in that: The lampshade (22) is a frustum structure that is narrow at the top and wide at the bottom, and the side wall of the first clamping piece (24) that contacts and fits with the outer wall of the lampshade (22) is a slope structure.

4. A thread pitch diameter measuring device according to claim 2, characterized in that: The support plate assembly (26) comprises a first support plate (261) and a second support plate (262) which are symmetrically arranged. The first light collecting cover (251) and the second light collecting cover (252) are both arc-shaped plate structures. The first light collecting cover (251) and the second light collecting cover (252) are combined with the first support plate (261) and the second support plate (262) to form a light collecting channel. The side walls on both sides of the first light collecting cover (251) are provided with first limiting grooves, and the side walls on both sides of the second light collecting cover (252) are provided with second limiting grooves. The first limiting grooves on both sides are respectively used to limit the first ends of the first support plate (261) and the second support plate (262), and the second limiting grooves on both sides are respectively used to limit the second end of the second support plate (262). A limiting spring is arranged between the first light collecting cover (251) and the second light collecting cover (252), and the first support plate (261) is connected to the top of the support frame (6).

5. A thread pitch diameter measuring device according to claim 1, characterized in that: The position-limiting support assembly (4) comprises a first position-limiting member (41) and a second position-limiting member (42) which are symmetrically arranged. A mounting frame (7) is arranged on the base (1). The first position-limiting member (41) and the second position-limiting member (42) are simultaneously hinged to the mounting frame (7). The first position-limiting member (41) and the second position-limiting member (42) are used to support and limit the part to be measured. The threaded mid-diameter measuring device also comprises a clamping and limiting mechanism (5). The clamping and limiting mechanism (5) is used to clamp and limit the two ends of the part to be measured.

6. A thread pitch diameter measuring device according to claim 5, characterized in that: The clamping and limiting mechanism (5) comprises a sliding shaft (51), a supporting tube (52), a pushing assembly and a clamping plate (56); the supporting tube (52) is arranged on the base (1); the sliding shaft (51) is arranged in the supporting tube (52) to slide along the axial direction of the part to be measured; the clamping plate (56) is arranged on a side of the sliding shaft (51) close to the end face of the part to be measured; the pushing assembly is used to connect the first limiting member (41) and the sliding shaft (51), and then when the part to be measured presses the first limiting member (41), the sliding shaft (51) is pushed to move and drive the clamping plate (56) to clamp and limit the end face of the part to be measured.

7. A thread pitch diameter measuring device according to claim 1, characterized in that: The pushing component comprises a compression spring (53), a second clamping member (54) and a pushing member (55); the second clamping member (54) is arranged on the sliding shaft (51); the compression spring (53) is pressed between the second clamping member (54) and the supporting tube (52); the pushing member (55) is arranged at the bottom of the first limiting member (41); the pushing member (55) is used to abut against the side wall of the second clamping member (54); and when the first limiting member (41) rotates around its hinge point, the pushing member (55) pushes the second clamping member (54) to move axially along the supporting tube (52), thereby driving the sliding shaft (51) and the clamping plate (56) to clamp and limit the end surface of the part to be measured.

8. A thread pitch diameter measuring device according to claim 7, characterized in that: The side wall of the pushing member (55) that abuts against the second clamping member (54) is a sloped structure, and the side wall of the second clamping member (54) that abuts against the pushing member (55) is a sloped structure.

9. A thread pitch diameter measuring device according to claim 1, characterized in that: The lifting assembly (3) comprises a slider (31), a screw rod (32) and a guide rod (33), wherein the screw rod (32) and the guide rod (33) are arranged on the base (1) at intervals, the slider (31) is sleeved on the screw rod (32) and connected to the screw rod by threads, the guide rod (33) penetrates the slider (31), and the guide rod (33) is used to guide the slider (31), the slider (31), and the projection lamp mechanism (2) comprises a second connecting rod (27), wherein a first end of the second connecting rod (27) is connected to the slider (31), and a second end of the second connecting rod (27) is connected to the projection lamp (21), and a hand wheel (34) is arranged on the top of the screw rod (32).

10. A method for measuring the pitch diameter of a thread, characterized in that: Using the thread pitch diameter measuring device according to any one of claims 1 to 9, the thread pitch diameter measuring method comprises the following steps: S100, the part to be tested is supported and limited on the base (1) by a limit support assembly (4), and the part to be tested is vertically illuminated by a projection lamp mechanism (2); S200, obtaining a projection view of the part to be measured, and drawing thread projection straight lines L1, L2, L3, ..., L6 on the base (1); S300, extending the thread projection lines L1 and L2 to obtain an intersection A; extending the thread projection lines L2 and L3 to obtain an intersection D; extending the thread projection lines L3 and L4 to obtain an intersection B; extending the thread projection lines L4 and L5 to obtain an intersection E; and extending the thread projection lines L5 and L6 to obtain an intersection C; S400, connect the intersection points A, B, and C to fit a straight line L7, and connect the intersection points D and E to fit a straight line L8; draw the midline of the straight line L7 and the straight line L8 to obtain a thread mid-diameter line L9 on one side; S500, the thread center warp L10 on the other side can be obtained in the same way.

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