Thread pitch diameter measuring device and measuring method

Abstract

The application discloses a thread pitch diameter measuring device and a measuring method, and belongs to the technical field of thread part detection, which comprises a base, a projection lamp mechanism, a lifting assembly and a limiting support assembly; the limiting support assembly is arranged on the two sides of the base; the projection lamp mechanism is connected with the lifting assembly; the projection lamp mechanism comprises a projection lamp, a lampshade, a support frame and a spotlight assembly; the top of the projection lamp is provided with the lampshade; the spotlight assembly is used for surrounding the projection lamp to form a spotlight channel; the spotlight channel is used for concentrating the light of the projection lamp to vertically downward irradiation; and the lampshade is also used for driving the spotlight assembly to expand or shrink when being lifted by the lifting assembly, so as to adjust the size of the spotlight channel. The application conveniently realizes the clamping of the measured part through the limiting support assembly, and finely adjusts the height of the projection lamp mechanism through the lifting assembly, so as to adapt to the high-precision projection irradiation measurement requirements of different sizes of the measured parts.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thread part detection, in particular, to a thread pitch diameter measuring device. In addition, the present application also relates to a thread pitch diameter measuring method comprising the thread pitch diameter measuring device. BACKGROUND

[0002] The information provided in this section is for the purpose of generally presenting the context of the present application. The work of the presently named inventors, to the extent the descriptions are concerned with, and the descriptions themselves, as far as they describe aspects of the present application, neither explicitly nor implicitly, are considered prior art with respect to the present application.

[0003] The thread pitch diameter is a virtual size, and most sizes in the thread measuring element are related to the thread pitch diameter, such as the thread pitch diameter value, the thread perpendicularity, the thread runout, etc.

[0004] In the prior art, the methods for thread detection mainly include contact type and non-contact type detection methods. The contact type detection method mainly includes comprehensive measurement (such as gauge measurement) and single measurement (such as three-pin measurement). The non-contact type method mainly detects through thread image information, such as tool microscope method and machine vision detection method. Among them, the machine vision detection technology has the advantages of non-contact, high precision, etc.

[0005] However, the existing thread measurement of thread parts adopts the machine vision system for detection, which has a high cost and is difficult to effectively improve the efficiency, and cannot meet the efficient detection of a large number of thread parts. At the same time, there are problems such as troublesome clamping of the measured parts, and the height of the projection lamp is not convenient to adjust and is difficult to adapt to the detection of parts of different sizes.

[0006] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0007] In view of at least one of the above technical problems, the present application provides a thread pitch diameter measuring device, which can conveniently realize the clamping of the measured parts through the limiting support assembly, and finely adjust the height of the projection lamp mechanism through the lifting assembly, to adapt to the high-precision projection irradiation measurement requirements of measured parts of different sizes.

[0008] The present application also provides a thread pitch diameter measuring method comprising the thread pitch diameter measuring device.

[0009] According to one aspect of the present application, a thread pitch diameter measuring device is provided, comprising a base, a projection lamp mechanism, a lifting assembly and a limiting support assembly.

[0010] The limiting support assembly is arranged on both sides of the base and is used for supporting the limiting part to be measured;

[0011] The lifting assembly is arranged on the base, the projection lamp mechanism is connected with the lifting assembly, the lifting assembly is used for driving the projection lamp mechanism to lift, and the projection lamp mechanism is used for vertically irradiating the part to be measured to form a projection view. The projection lamp mechanism comprises a projection lamp, a lampshade, a support frame and a light collecting assembly. The projection lamp is connected with the lifting assembly through a second connecting rod. The lampshade is arranged on the top of the projection lamp and is used for shielding and protecting the top of the projection lamp and converging the light of the projection lamp downward. The support frame is arranged on the base and is used for supporting the light collecting assembly. The light collecting assembly is used for surrounding the projection lamp outside to form a light collecting channel. The light collecting channel is used for converging the light of the projection lamp and vertically irradiating downward. The lampshade is also used for pushing the light collecting assembly to expand or shrink when being lifted by the lifting assembly, so as to adjust the size of the light collecting channel.

[0012] In some embodiments of the present application, the projection lamp mechanism further comprises a first clamping part and a support plate assembly. The support plate assembly is supported and fixed by the support frame. The light collecting assembly comprises symmetrically arranged first and second light collecting covers. The first and second light collecting covers are movably arranged on both sides of the support plate assembly and are used for surrounding the projection lamp outside to form the light collecting channel. The first and second light collecting covers are both provided with a first connecting rod on the inner side. The tail end of the first connecting rod is connected with the first clamping part. The first clamping part is used for abutting against the outer wall of the lampshade. The lampshade is used for pushing the first clamping parts on both sides to move in the horizontal direction during lifting, so as to push the first and second light collecting covers to move in the horizontal direction to adjust the size of the light collecting channel.

[0013] In some embodiments of the present application, the lampshade is a conical structure with a narrow top and a wide bottom. The side wall of the first clamping part in contact with the outer wall of the lampshade is a slope structure.

[0014] In some embodiments of the present application, the support plate assembly comprises symmetrically arranged first and second support plates. The first and second light collecting covers are both arc-shaped plate structures. The first and second light collecting covers and the first and second support plates surround to form the light collecting channel. The side walls on both sides of the first light collecting cover are both provided with a first limiting groove. The side walls on both sides of the second light collecting cover are both provided with a second limiting groove. The first limiting grooves on both sides are respectively used for limiting the first ends of the first and second support plates. The second limiting grooves on both sides are respectively used for limiting the second ends of the second support plate. A limiting spring is arranged between the first and second light collecting covers. The first support plate is connected with the top of the support frame.

[0015] In some embodiments of the present application, the limiting support assembly comprises symmetrically arranged first and second limiting members, the base is provided with a mounting rack, the first and second limiting members are hinged to the mounting rack, the first and second limiting members are used to support and limit the measured part, and the thread pitch diameter measuring device further comprises a pressing limiting mechanism used to press and limit the two ends of the measured part.

[0016] In some embodiments of the present application, the pressing limiting mechanism comprises a sliding shaft, a supporting cylinder, a pushing assembly and a pressing plate, the supporting cylinder is arranged on the base, the sliding shaft is arranged in the supporting cylinder in the axial direction of the measured part, the pressing plate is arranged on the side of the sliding shaft close to the end face of the measured part, and the pushing assembly is used to connect the first limiting member and the sliding shaft, so that when the first limiting member is pressed down on the measured part, the sliding shaft is moved and the pressing plate is driven to press and limit the end face of the measured part.

[0017] In some embodiments of the present application, the pushing assembly comprises a compression spring, a second clamping member and a pushing member, the second clamping member is arranged on the sliding shaft, the compression spring is arranged between the second clamping member and the supporting cylinder, 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 clamping member, and when the first limiting member rotates around the hinge point, the second clamping member is moved in the axial direction of the supporting cylinder through the pushing member, so as to drive the sliding shaft and the pressing plate to press and limit the end face of the measured part.

[0018] In some embodiments of the present application, the side wall of the pushing member abutting against the second clamping member is in a slope structure, and the side wall of the second clamping member abutting against the pushing member is in a slope structure.

[0019] In some embodiments of the present application, the lifting assembly comprises a sliding block, a lead screw and a guide rod, the lead screw and the guide rod are arranged on the base in a spaced manner, the sliding block is sleeved on the lead screw and connected with the lead screw through a thread, and the guide rod is arranged through the sliding block, the guide rod is used to guide the sliding block, the sliding block, the projection lamp mechanism comprises a second connecting rod, the first end of the second connecting rod is connected with the sliding block, the second end of the second connecting rod is connected with the projection lamp, and the top of the lead screw is provided with a hand wheel.

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

[0021] S100, supporting and limiting the measured part on the base through the limiting support assembly, and vertically irradiating the measured part through the projection lamp mechanism;

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

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

[0024] S400, connect the intersection point A, the intersection point B, the intersection point C to fit the straight line L7, connect the intersection point D, the intersection point E to fit the straight line L8; make the middle line of the straight line L7 and the straight line L8 to obtain the thread pitch diameter line L9 of one side;

[0025] S500, the other thread pitch diameter line L10 of the other side can be obtained in the same way.

[0026] The application has the following beneficial effects:

[0027] The thread pitch diameter measuring device measures the thread pitch diameter of the measured part by limiting the support assembly, and forms a projection view by vertically irradiating the measured part through the projection lamp mechanism. The projection lamp mechanism is provided with a light condensing assembly outside, the light condensing assembly forms a light condensing channel by surrounding the outside of the projection lamp, and the light of the projection lamp is condensed and vertically downward irradiated. When the projection lamp and the lampshade are raised and lowered, the light condensing assembly is expanded or contracted by the lampshade to adjust the size of the light condensing channel to adapt to the projection irradiation requirements of measured parts of different sizes. That is, when the diameter of the measured part is large, the light condensing channel is expanded by raising the projection lamp mechanism to expand the light condensing channel, thereby expanding the irradiation range; when the size of the measured part is small, stronger irradiation light intensity is required, and the projection lamp mechanism is lowered to contract the light condensing assembly to form a clearer projection view of the measured part.

[0028] The thread pitch diameter measuring method also has the beneficial effects described above. It also includes using an optical method to define the thread pitch diameter line on the optical projection image to obtain the thread-related elements that need to be measured. The thread projection view is obtained by using a lamp projector, the large diameter line and the small diameter line of the thread are obtained by using a special point fitting method, the middle line of the large diameter line and the small diameter line is drawn, and the thread pitch diameter line is obtained. The virtual and abstract thread pitch diameter is materialized, not only the specific value of the thread pitch diameter can be measured, but also the actual processing state of the thread can be reflected, which is suitable for high-precision aviation engine thread part detection scenes.

[0029] Of course, implementing any product of the application does not necessarily require all the advantages described above. In addition to the purposes, features and advantages described above, the application has other purposes, features and advantages. The application will be further described in detail below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate preferred embodiments of the present application and serve to explain the principles of the present application. In these drawings:

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

[0032] Figure 2 is a schematic diagram of the thread pitch diameter of both sides of the part to be measured of the preferred embodiment of the present application;

[0033] Figure 3 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 schematic diagram of the structure of the projection lamp mechanism of the 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 is a schematic diagram of the structure of the compression limiting assembly of the preferred embodiment of the present application;

[0037] Figure 7 is a schematic diagram of the structure of the light focusing assembly of the preferred embodiment of the present application;

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

[0039] Figure 9 is a schematic diagram of the structure of the pushing member of the preferred embodiment of the present application;

[0040] Legend: 1, base; 2, projector mechanism; 21, light projector; 22, lampshade; 23, first connecting rod; 24, first clamping member; 25, light focusing assembly; 251, first light focusing cover; 252, second light focusing cover; 26, support plate assembly; 261, first support plate; 262, second support plate; 27, second connecting rod; 3, lifting assembly; 31, sliding block; 32, lead screw; 33, guide rod; 34, hand wheel; 4, limiting support assembly; 41, first limiting support member; 42, second limiting support member; 5, compression limiting mechanism; 51, sliding shaft; 52, support cylinder; 53, compression spring; 54, second clamping member; 55, pushing member; 56, compression plate; 6, support frame; 7, mounting frame. DETAILED DESCRIPTION

[0041] The embodiments of the present application are described in detail below with reference to the accompanying drawings, but the present application can be implemented in various different ways as defined and covered by the following description.

[0042] Figure 1 is a schematic diagram of the fitting thread diameter of the preferred embodiment of the present application; Figure 2 is a schematic diagram of the thread diameter of the two sides of the part to be measured of the preferred embodiment of the present application; Figure 3 is a schematic diagram of the overall structure of the measuring device of the preferred embodiment of the present application; Figure 4 is a schematic diagram of the structure of the projection lamp mechanism of the 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 is a schematic diagram of the structure of the pressing and limiting assembly of the preferred embodiment of the present application; Figure 7 is a schematic diagram of the structure of the light gathering assembly of the preferred embodiment of the present application; Figure 8 is a schematic diagram of the structure of the second clamping member of the preferred embodiment of the present application; Figure 9 is a schematic diagram of the structure of the pushing member of the preferred embodiment of the present application.

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

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

[0045] The lifting assembly 3 is arranged on the base 1, the projection lamp mechanism 2 is connected with 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 irradiate the part to be measured to form a projection view, the projection lamp mechanism 2 comprises a projection lamp 21, a lampshade 22, a support frame 6 and a light gathering assembly 25, the projection lamp 21 is connected with the lifting assembly 3 through a second connecting rod 27, the projection lamp 21 is provided with the lampshade 22 on the top, the lampshade 22 is used to shield and protect the top of the projection lamp 22 and gather the light of the projection lamp 21 downward, the support frame 6 is arranged on the base 1, the support frame 6 is used to support the light gathering assembly 25, the light gathering assembly 25 is used to form a light gathering channel around the outside of the projection lamp 21, the light gathering channel is used to gather the light of the projection lamp 21 and irradiate vertically downward, and the lampshade 22 is also used to push the light gathering assembly 25 to expand or shrink when being driven by the lifting assembly 3 to lift, so as to adjust the size of the light gathering channel.

[0046] The threaded pitch measuring device supports and positions the measured part through the limiting support assembly 4, forms a projection view by vertically irradiating the measured part through the projection lamp mechanism 2, and drives the projection lamp mechanism 2 to rise and fall through the lifting assembly 3 to adapt to different projection irradiation requirements. The outer side of the projection lamp mechanism 2 is provided with a spotlight assembly 25, the spotlight assembly 25 forms a spotlight channel by surrounding the outside of the projection lamp 21, and the spotlight channel gathers the light of the projection lamp 21 and vertically irradiates downward. When the projection lamp 21 and the lampshade 22 rise and fall, the spotlight assembly 25 can be expanded or contracted by the lampshade 22 to adjust the size of the spotlight channel, so as to adapt to the projection irradiation requirements of measured parts of different sizes. That is, when the diameter of the measured part is large, the spotlight channel can be expanded by raising the projection lamp mechanism 2 to expand the spotlight channel, thereby expanding the irradiation range; when the size of the measured part is small, stronger irradiation light intensity is required, and the projection lamp mechanism 2 can be lowered to contract the spotlight assembly 25 to form a clearer projection view of the measured part.

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

[0048] Specifically, the lampshade 22 is a tapered structure with a narrow upper part and a wide lower part, and the side wall of the first clamping part 24 in contact with the outer wall of the lampshade 22 is a slope structure.

[0049] It can be understood that by movably arranging the first spotlight cover 251 and the second spotlight cover 252 on both sides of the support plate assembly 26, the spotlight channel can be formed outside the projection lamp 21 with the support plate assembly 25, 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 inclination of the light affecting the effect of the projection view. And the first spotlight cover 251 and the second spotlight cover 252 are movably arranged, so that the size of the spotlight channel can be adjusted to adjust the irradiation range of the light and adapt to the measurement requirements of measured parts of different sizes.

[0050] When the lampshade 22 rises, the side wall of the lampshade 22 pushes the first clamping part 24 to move in the horizontal direction, and the first light cover 251 and the second light cover 252 are pushed to move in the horizontal direction to adjust the size of the light channel. At this time, the support plate assembly 26 also plays a limiting role on the first light cover 251 and the second light cover 252.

[0051] Preferably, referring to Figure 3 、 4 , 5, the support plate assembly 26 includes symmetrically arranged first support plate 261 and second support plate 262, the first light cover 251 and the second light cover 252 are arc-shaped plate structures, the first light cover 251 and the second light cover 252 and the first support plate 261 and the second support plate 262 form a light channel, the side wall of the first light cover 251 is provided with a first limiting groove, the side wall of the second light cover 252 is provided with a second limiting groove, the first limiting grooves on both sides are used for limiting the first ends of the first support plate 261 and the second support plate 262, and the second limiting grooves on both sides are used for limiting the second ends of the second support plate 262. A limiting spring is arranged between the first light cover 251 and the second light cover 252, and the first support plate 261 is connected with the top of the support frame 6.

[0052] It can be understood that the first light cover 251 and the second light cover 252 and the first support plate 261 and the second support plate 262 can be surrounded around the projection lamp 21 to form a light channel, and the first light cover 251 and the second light cover 252 can be relatively displaced to adjust the size of the light channel. The limiting spring between the first light cover 251 and the second light cover 252 can provide an elastic force for pulling the first light cover 251 and the second light cover 252 close to each other, so that the reset of the two can be realized.

[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 conducive to improving the stability of the support plate assembly 26 as a whole.

[0054] Preferably, referring to Figure 3 、 6 , 8, 9, the limiting support assembly 4 includes symmetrically arranged first limiting part 41 and second limiting part 42, the base 1 is provided with a mounting frame 7, the first limiting part 41 and the second limiting part 42 are hinged with the mounting frame 7 at the same time, the first limiting part 41 and the second limiting part 42 are used for supporting and limiting the measured part, and the screw pitch measuring device further includes a pressing limiting mechanism 5, which is used for pressing and limiting the two ends of the measured part.

[0055] Specifically, the pressing limiting mechanism 5 comprises a sliding shaft 51, a supporting cylinder 52, a pushing assembly and a pressing plate 56, the supporting cylinder 52 is arranged on the base 1, the sliding shaft 51 is arranged in the supporting cylinder 52 and slides along the axial direction of the measured part, the pressing plate 56 is arranged on the side of the sliding shaft 51 close to the end surface of the measured part, and the pushing assembly is used to connect the first limiting piece 41 and the sliding shaft 51, so as to push the sliding shaft 51 to move and drive the pressing plate 56 to press and limit the end surface of the measured part when the first limiting piece 41 is pressed down.

[0056] Optionally, the first limiting piece 41 and the second limiting piece 42 are both hinged to the mounting frame 7 through torsional springs. The first limiting piece 41 and the second limiting piece 42 are symmetrically and obliquely arranged, the bottoms of the two are close to each other, and the two form a V shape, so as to better adapt to the limiting and supporting of measured parts of different sizes.

[0057] It can be understood that the first limiting piece 41 and the second limiting piece 42 can conveniently support and limit the measured part. The measured part is only needed to be placed between the first limiting piece 41 and the second limiting piece 42, the measured part presses the first limiting piece 41 and the second limiting piece 42 downward through gravity, and the first limiting piece 41 and the second limiting piece 42 are both rotated by a certain angle around the hinge points to stably support the measured part. At this time, since the two ends of the measured part are not limited, in order to improve the limiting and fixing of the whole measured part, the two ends of the measured part are pressed and limited by the pressing limiting assembly 5, so as to ensure the stability of the measured part in the measuring process and be beneficial to improving the measuring precision.

[0058] Preferably, as shown in Figure 8 , 9 , the pushing assembly comprises a compression spring 53, a second clamping piece 54 and a pushing piece 55, the second clamping piece 54 is arranged on the sliding shaft 51, the compression spring 53 is pressed between the second clamping piece 54 and the supporting cylinder 52, the pushing piece 55 is arranged at the bottom of the first limiting piece 41, the pushing piece 55 is used to abut against the side wall of the second clamping piece 54, and when the first limiting piece 41 rotates around the hinge point, the second clamping piece 54 is moved along the axial direction of the supporting cylinder 52 through the pushing piece 55, so as to drive the sliding shaft 51 and the pressing plate 56 to press and limit the end surface of the measured part.

[0059] Specifically, the side wall of the pushing piece 55 abutting and fitting with the second clamping piece 54 is a slope structure, and the side wall of the second clamping piece 54 abutting and fitting with the pushing piece 55 is a slope structure.

[0060] It can be understood that when the to-be-measured part is placed between the first limiting piece 41 and the second limiting piece 42, the first limiting piece 41 is pressed downward to rotate around the hinge point by a certain angle, then the first limiting piece 41 drives the pushing piece 55 to extrude the second clamping piece 54, the second clamping piece 54 and the sliding shaft 51 are pushed along the axial direction of the supporting cylinder 52, and the pressing plate 56 is synchronously moved to press and limit the end face of the to-be-measured part. Since the limiting and supporting assembly 4 and the pressing and limiting assembly 5 are symmetrically arranged, the two pressing and limiting assemblies 5 can simultaneously press and limit the two ends of the to-be-measured part, that is, when the to-be-measured part is placed on the limiting and supporting assembly 4, it is simultaneously supported and limited by the limiting and supporting assembly 4, and the two ends are pressed and fixed by the pressing plate 56, realizing omnibearing limiting and fixing effect and ensuring the stability of the to-be-measured part during the measurement process.

[0061] Preferably, referring to Figure 3 As shown in the figure, the lifting assembly 3 includes a sliding block 31, a lead screw 32 and a guide rod 33, the lead screw 32 and the guide rod 33 are arranged on the base 1 in a spaced manner, the sliding block 31 is sleeved on the lead screw 32 and connected with the lead screw through threads, and the guide rod 33 penetrates through the sliding block 31 and is arranged, the guide rod 33 is used for guiding the sliding block 31, the sliding block 31, the projection lamp mechanism 2 includes a second connecting rod 27, a first end of the second connecting rod 27 is connected with the sliding block 31, and a second end of the second connecting rod 27 is connected with the projection lamp 21, and a hand wheel 34 is arranged at the top of the lead screw 32.

[0062] It can be understood that the sliding block 31 and the lead screw 32 constitute a lead screw nut transmission mechanism, the lead screw 32 is driven to rotate by rotating the hand wheel 34, and then the sliding block 31 is driven to ascend and descend along the guide rod 33, the sliding block 31 and the projection lamp 21 are connected through the second connecting rod 27, synchronous ascending and descending movement of the two is realized, so as to meet the irradiation requirement of the to-be-measured part of different sizes, and the adaptability of the measuring device is improved.

[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, and the thread pitch diameter measuring method comprises the following steps:

[0064] S100, supporting and limiting the to-be-measured part on the base 1 through the limiting and supporting assembly 4, and vertically irradiating the to-be-measured part through the projection lamp mechanism 2;

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

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

[0067] S400, connect the intersection point A, the intersection point B, the intersection point C to fit the straight line L7, connect the intersection point D, the intersection point E to fit the straight line L8; make the middle line of the straight line L7 and the straight line L8 to obtain the thread pitch diameter line L9 of one side;

[0068] S500, the other side thread pitch diameter line L10 can be obtained by the same method.

[0069] The thread pitch diameter measurement method of the application also has the beneficial effects described above. It also includes using an optical method to obtain the thread pitch diameter line on the optical projection image by using the definition method, thereby obtaining the thread-related elements to be measured. Wherein the light projector is used to obtain the thread projection view, the major diameter line and the minor diameter line of the thread are obtained by the special point fitting method, the middle line of the major diameter line and the minor diameter line is made, and the thread pitch diameter line is obtained. The virtual and abstract thread pitch diameter is materialized, not only the specific numerical value of the thread pitch diameter can be measured, but also the actual processing state of the thread can be reflected, which is suitable for high-precision aviation engine thread part detection scene.

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

[0071] The principles and implementation modes of the application are described by using specific examples in this text, and the above example is only used to help understand the method and its core idea of the application. The above description is only the preferred embodiment of the application. It should be noted that due to the limitation of language expression, there are infinite specific structures, and for ordinary skilled persons in the technical field, some improvements, decorations or changes can be made without departing from the principles of the application, and the above technical features can be combined in a proper way; these improvements, decorations, changes or combinations, or the application of the inventive concept and technical scheme to other fields without improvement, shall be regarded as the protection of the application.

Claims

1. A thread pitch diameter measuring device characterized by, The base (1), the projection lamp mechanism (2), the lifting assembly (3) and the limiting support assembly (4) are arranged on the base (1), and the limiting support assembly (4) is used for supporting the limiting of the measured part; The lifting assembly (3) is arranged on the base (1), the projection lamp mechanism (2) is connected with the lifting assembly (3), the lifting assembly (3) is used for driving the projection lamp mechanism (2) to lift, the projection lamp mechanism (2) is used for vertically irradiating the measured part to form a projection view, the projection lamp mechanism (2) comprises a projection lamp (21), a lampshade (22), a support frame (6) and a spotlight assembly (25), the projection lamp (21) is connected with the lifting assembly (3) through a second connecting rod (27), the top of the projection lamp (21) is provided with the lampshade (22), the lampshade (22) is used for shielding and protecting the top of the projection lamp (21) and converging the light of the projection lamp (21) downward, the support frame (6) is arranged on the base (1), the support frame (6) is used for supporting the spotlight assembly (25), the spotlight assembly (25) is used for forming a spotlight channel on the outside of the projection lamp (21), the spotlight channel is used for converging the light of the projection lamp (21) and vertically irradiating downward, the lampshade (22) is also used for driving the spotlight assembly (25) to expand or shrink when being driven by the lifting assembly (3) to lift, so as to adjust the size of the spotlight channel; The projection lamp mechanism (2) further comprises a first clamping part (24) and a support plate assembly (26), the support plate assembly (26) is supported and fixed by the support frame (6), the spotlight assembly (25) comprises symmetrically arranged first and second spotlight covers (251) and (252), the first and second spotlight covers (251) and (252) are movably arranged on the two sides of the support plate assembly (26) and are used for forming the spotlight channel with the support plate assembly (26) on the outside of the projection lamp (21), the first and second spotlight covers (251) and (252) are provided with first connecting rods (23) on the inner sides, the tail ends of the first connecting rods (23) are connected with the first clamping part (24), the first clamping part (24) is used for abutting against the outer wall of the lampshade (22), the lampshade (22) is used for driving the first clamping parts (24) on the two sides to move in the horizontal direction in the process of lifting, and then drives the first and second spotlight covers (251) and (252) to move in the horizontal direction to adjust the size of the spotlight channel; ​ The support plate assembly (26) includes a first support plate (261) and a second support plate (262) that 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 enclosed with the first support plate (261) and the second support plate (262) to form a light collecting channel. First limiting grooves are provided on the side walls on both sides of the first light collecting cover (251), and second limiting grooves are provided on the side walls on both sides of the second light collecting 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 end of the second support plate (262). A limiting spring is provided between the first light collecting cover (251) and the second light collecting cover (252). The first support plate (261) is connected to the top of the support frame (6); 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 provided 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 further comprises a pressing and limiting mechanism (5). The pressing and limiting mechanism (5) is used to press and limit the two ends of the part to be measured.

2. A thread pitch diameter measuring device according to claim 1, wherein 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 sloped structure.

3. A thread pitch diameter measuring device according to claim 1, wherein The pressing and limiting mechanism (5) comprises a sliding shaft (51), a supporting tube (52), a pushing assembly and a pressing plate (56); the supporting tube (52) is arranged on the base (1); the sliding shaft (51) is arranged in the supporting tube (52) for sliding along the axial direction of the part to be measured; the pressing 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 pressing plate (56) to press and limit the end face of the part to be measured.

4. A thread pitch diameter measuring device according to claim 1, wherein The pushing assembly 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 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 clamping member (54). 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 support tube (52), thereby driving the sliding shaft (51) and the pressing plate (56) to press and limit the end surface of the part to be measured.

5. A thread pitch diameter measuring device according to claim 4, wherein 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.

6. A thread pitch diameter measuring device according to claim 1, wherein The lifting assembly (3) comprises a sliding block (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 sliding block (31) is sleeved on the screw rod (32) and connected with the screw rod through threads, the guide rod (33) penetrates through the sliding block (31) and is used for guiding the sliding block (31), the projection lamp mechanism (2) comprises a second connecting rod (27), the first end of the second connecting rod (27) is connected with the sliding block (31), the second end of the second connecting rod (27) is connected with the projection lamp (21), and the top of the screw rod (32) is provided with a hand wheel (34).

7. A method of thread pitch diameter measurement, characterized by, The thread pitch diameter measuring device and the thread pitch diameter measuring method according to any one of claims 1-6, the thread pitch diameter measuring method comprising the following steps: S100, supporting and limiting the to-be-measured part on the base (1) through the limiting support assembly (4) and vertically irradiating the to-be-measured part through the projection lamp mechanism (2); S200, obtaining the projection view of the to-be-measured part and drawing the thread projection straight lines L1, L2, L3, …, L6 on the base (1); S300, extending the thread projection straight lines L1 and L2 to obtain the intersection point A, extending the thread projection straight lines L2 and L3 to obtain the intersection point D, extending the thread projection straight lines L3 and L4 to obtain the intersection point B, extending the thread projection straight lines L4 and L5 to obtain the intersection point E, and extending the thread projection straight lines L5 and L6 to obtain the intersection point C; S400, connecting the intersection point A, the intersection point B and the intersection point C to fit the straight line L7, connecting the intersection point D and the intersection point E to fit the straight line L8, and drawing the midline of the straight line L7 and the straight line L8 to obtain the thread pitch diameter line L9 of one side; S500, the thread pitch diameter line L10 of the other side can be obtained in the same way.

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