Gear thread pitch diameter measuring equipment and measuring method thereof

Abstract

The invention belongs to the technical field of thread detection, and particularly relates to a gear thread pitch diameter measuring device and method, and the device comprises a device outer frame which is internally provided with an adjusting mechanism and a group of symmetrically arranged measuring mechanisms; wherein the two measuring mechanisms are respectively arranged at the left side and the right side of the detection station and are suitable for measuring the pitch diameter of the thread of the detected workpiece; the adjusting mechanism is suitable for being controlled by the control module before the two measuring mechanisms start measuring, and then the position of the detected workpiece is driven to be adjusted, and the detected workpiece is moved to a measuring position. And the image acquisition mechanism is positioned on one side of the detection station and is suitable for photographing the detected workpiece after the detected workpiece is placed on the adjusting mechanism and judging whether the placement position of the current detected workpiece is a set position or not.

Description

Technical Field

[0001] The invention belongs to the technical field of thread detection, and in particular relates to a gear thread pitch diameter measuring device and a measuring method thereof. Background Art

[0002] Threads contain multiple geometric parameters, such as outer diameter, inner diameter, mean diameter, pitch, lead, tooth angle, thread lead angle and working height. The mean diameter refers to the diameter of an imaginary cylinder with equal widths through the protrusion and groove on the tooth profile, and is also one of the important parameters of the thread structure. In order to improve the accuracy of the processing process, quality inspection personnel are required to measure and inspect the mean diameter of the processed thread. Currently, inspectors usually use a micrometer screw gauge specifically for measuring the mean diameter for measurement. When measuring, it must be ensured that it is parallel to the cross-section circular surface, and it is also necessary to confirm that one side of the measuring head is aligned with the thread gap and the other side is aligned with the thread. The process is relatively cumbersome and it is difficult to ensure the accuracy of the measurement.

[0003] Therefore, a gear thread diameter measuring device and a measuring method are designed to solve the technical problem that it is difficult to keep the micrometer parallel to the cross-section circle of the attack in the process of manually measuring the diameter with a screw micrometer in the prior art, resulting in measurement errors. It should be noted that the above information disclosed in this background technology section is only used to understand the background technology of the present application concept, and therefore, the above description is not considered to constitute information of the prior art. Summary of the invention

[0004] The embodiments of the present disclosure at least provide a gear thread pitch diameter measuring device and a measuring method thereof.

[0005] In a first aspect, an embodiment of the present disclosure provides a gear thread pitch diameter measuring device, comprising: The outer frame of the equipment has an adjustment mechanism and a set of symmetrically arranged measuring mechanisms arranged inside; The two measuring mechanisms are respectively arranged on the left and right sides of the inspection station, and are suitable for measuring the thread diameter of the inspected workpiece; The adjustment mechanism is suitable for being controlled by the control module before the two measuring mechanisms start measuring, thereby driving the position of the inspected workpiece to be adjusted and moving the inspected workpiece to the measuring position; and The image acquisition mechanism is located at one side of the detection station and is suitable for taking pictures of the detected workpiece after the detected workpiece is placed on the adjustment mechanism, and judging whether the current placement position of the detected workpiece is the set position.

[0006] In an optional embodiment, each of the measuring mechanisms comprises: A fixing frame is arranged inside the outer frame of the equipment and is located on one side of the workpiece to be inspected; A fixed seat is arranged on the upper end surface of the fixed frame, and a moving component and a displacement measuring component are arranged above the fixed seat; wherein The moving assembly is suitable for driving the measuring needle in the displacement measuring assembly to move until the measuring needle abuts against the workpiece to be detected; and The displacement measuring component measures the moving distance of the measuring needle through the displacement sensor under the control of the control module.

[0007] In an optional embodiment, the moving component includes: A mobile driver, controlled by a control module, and arranged on the upper end surface of the fixing seat; An L-shaped moving plate, disposed on the upper end surface of the moving driver and connected to the output end of the moving driver; and The bearing plate has a lower end surface connected to the L-shaped moving plate, and an upper end surface connected to a fixed block in the displacement measuring assembly.

[0008] In an optional implementation, the displacement measurement assembly includes: A slider, the lower end surface of which is connected to the upper end surface of the bearing plate; wherein A cavity is provided inside the sliding block, and a slide rail is provided on the inner wall of the cavity; a measuring block, one side of which is slidably connected to the slide rail and the other side of which is provided with a measuring needle; and A pair of return springs are respectively arranged on the upper and lower end surfaces of the measuring block, and are suitable for keeping the measuring block stable on the slide rail.

[0009] In an optional embodiment, the interior of the measuring block is hollow, and a guide needle is slidably connected to the interior of the measuring block; wherein One end of the guide needle is located inside the measuring block, and the other end is located outside the measuring block and parallel to the measuring needle; A guide spring is arranged inside the measuring block, and one end of the guide spring is connected to the inner wall of the measuring block, and the other end of the guide spring is connected to the measuring needle.

[0010] In an optional implementation, the displacement sensor is controlled by a control module and is slidably connected to the fixed block; The detection end of the displacement sensor faces the slider, and a fixing rod is provided at the end of the displacement sensor; wherein The fixing rod is suitable for being connected to the outer frame of the device, thereby keeping the displacement sensor stationary during the movement of the fixing block.

[0011] In an optional embodiment, the adjustment mechanism includes: A placement rack is arranged on the outer frame of the equipment, and a lifting drive is arranged inside the placement rack; wherein The lifting driver is controlled by a control module, and an output end of the lifting driver is connected to a placement plate via a lifting rod.

[0012] In an optional embodiment, the upper end surface of the placement plate is provided with a rotation driver, which is controlled by a control module; The output end of the rotary driver is connected to a rotary disk; and The workpiece to be inspected is placed on the upper end surface of the rotating disk.

[0013] In an optional implementation, the image acquisition mechanism includes: A first vertical plate is arranged on one side of the workpiece to be inspected, and a smart camera is arranged on the first vertical plate; The second vertical plate is arranged in a mirror image with the first vertical plate with the inspected workpiece as the center, and a light source plate is arranged on the second vertical plate.

[0014] In a second aspect, the present disclosure also provides a method for measuring the pitch diameter of a gear thread, comprising: Step S1, placing the workpiece to be inspected on the adjustment mechanism, taking a photo of the current workpiece to be inspected by using the image acquisition mechanism, and comparing it with the set workpiece inspection position; Step S2, driving the inspected workpiece to move by the adjusting mechanism, and adjusting the position of the inspected workpiece to a set position; Step S3, measuring the thread diameter of the inspected workpiece by measuring mechanisms on both sides of the inspected workpiece.

[0015] The beneficial effect of the present invention is that the device and its working method adopt an image acquisition mechanism to adjust the workpiece to be inspected after it is placed, so that the measuring positions of each workpiece to be inspected remain consistent, and then a detection mechanism is used to measure the middle diameter of the workpiece to be inspected from both sides of the left and right sides of the workpiece to be inspected, completely replacing the previous manual inspection with automatic machine inspection, realizing the automation of the inspection process, and improving the operating technology. In addition, the automated inspection improves the inspection efficiency and the inspection accuracy compared to manual inspection.

[0016] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0017] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, this article specifically cites preferred embodiments and provides detailed descriptions as follows in conjunction with the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 An overall stereogram provided for an embodiment of the present disclosure; Figure 2 A three-dimensional diagram of a measuring mechanism provided in an embodiment of the present disclosure; Figure 3 A stereogram of an adjustment mechanism is provided for an embodiment of the present disclosure; Figure 4 A first-view stereoscopic image of a displacement measurement assembly provided by an embodiment of the present disclosure; Figure 5 A second perspective stereogram of a displacement measurement assembly provided by an embodiment of the present disclosure; Figure 6 A schematic diagram of the structure of two measuring needle tips provided in an embodiment of the present disclosure.

[0020] In the figure: 1. Measuring mechanism; 10. Protective shell; 11. Fixed frame; 12. Fixed seat; 13. Moving assembly; 130. Moving driver; 131. L-shaped moving plate; 132. Loading plate; 14. Displacement measuring assembly; 140. Fixed block; 141. Sliding block; 141a. Push spring; 142. Displacement sensor; 142a. Fixed rod; 143. Cavity; 144. Measuring block; 145. Reset spring; 146. Measuring needle; 147. Guide needle; 148. Guide spring; 149. Slide rail; 2. Adjustment mechanism; 20. Placement rack; 21. Lifting drive; 22. Lifting rod; 23. Placement plate; 24. Rotation drive; 25. Rotating disk; 3. The workpiece to be inspected; 4. Equipment outer frame; 5. Image acquisition mechanism; 50. First vertical plate; 51. Smart camera; 52. Light source plate; 53. Second vertical plate. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In this article, when it is mentioned that the first component is located on the second component, this may mean that the first component may be directly formed on the second component, or the third component may be interposed between the first component and the second component. In addition, in the drawings, in order to effectively describe the technical content, the thickness of the components may be exaggerated or reduced.

[0023] In this article, when an element or layer is referred to as being "located on," "engaged to," "connected to," "attached to," or "coupled to" another element or layer, it may be directly located on, engaged, connected, attached to, or coupled to another element or layer, or there may be intermediate elements or layers. In contrast, when an element is referred to as being "directly on," "directly engaged to," "directly connected to," "directly attached to," or "directly coupled to" another element or layer, there may be no intermediate elements or layers. Other words used to describe the relationship between elements should be interpreted in a similar manner (e.g., "between" versus "directly between," "adjacent" versus "directly adjacent," etc.). As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0024] Herein, example embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as "at least one of..." modify the entire list of elements when following a list of elements, rather than modifying individual elements in the list. For example, the expression "at least one of a, b, and c" should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0025] The terms used herein are only used to describe specific exemplary configurations and are not intended to be limited. As used herein, the singular articles "one", "an" and "the" may also be intended to include plural forms, unless it is clearly indicated above that this is not the case. The terms "comprise", "include" and "have" are inclusive, and therefore specify the presence of features, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components and / or combinations thereof. The method steps, processes and operations described herein should not be interpreted as necessarily requiring them to be performed in the specific order discussed or shown, unless specifically identified as an execution order. Additional or alternative steps may be adopted.

[0026] As used herein, the phrases "in one embodiment," "according to one embodiment," "in some embodiments," and the like generally refer to the fact that the particular feature, structure, or characteristic following the phrase may be included in at least one embodiment of the present disclosure. Therefore, a particular feature, structure, or characteristic may be included in more than one embodiment of the present disclosure, so that these phrases do not necessarily refer to the same embodiment. As used herein, the terms "example," "exemplary," and the like are used to "serve as an example, instance, or illustration." Any implementation, aspect, or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. On the contrary, the use of the terms "example," "exemplary," and the like is intended to present concepts in a concrete manner.

[0027] Research has found that threads contain multiple geometric parameters, such as outer diameter, inner diameter, middle diameter, pitch, lead, tooth angle, thread lead angle and working height. The middle diameter refers to the diameter of an imaginary cylinder with equal widths through the protrusion and groove on the tooth profile, and is also one of the important parameters of the thread structure. In order to improve the accuracy of the processing process, quality inspection personnel are required to measure and inspect the middle diameter of the processed thread. Currently, inspectors usually use a micrometer screw gauge specially designed for measuring the middle diameter for measurement. When measuring, it must be ensured that it is parallel to the cross-section circular surface, and it is also necessary to confirm that one side of the measuring head is aligned with the thread gap and the other side is aligned with the thread. The process is relatively cumbersome and it is difficult to ensure the accuracy of the measurement.

[0028] Based on the above research, an embodiment of the present disclosure provides a gear thread mean diameter measuring device and a measuring method thereof. By adopting an image acquisition mechanism, the workpiece to be inspected is adjusted after being placed so that the measuring positions of each workpiece to be inspected remain consistent. Subsequently, a detection mechanism is used to measure the mean diameter of the workpiece to be inspected from both sides of the left and right sides of the workpiece to be inspected. The previous manual inspection is completely replaced by automatic machine inspection, thereby realizing the automation of the inspection process and improving the operating technology. In addition, the automated inspection improves the inspection efficiency and the inspection accuracy compared to manual inspection.

[0029] The defects existing in the above solutions are the results obtained by the inventor after practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed by the present invention in this article for the above problems should be the contributions made by the inventor to the present invention during the disclosure process.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0031] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0032] In some embodiments, Figure 1 As shown, at least one group of symmetrically arranged measuring mechanisms 1 is arranged inside the outer frame 4 of the device. The workpiece 3 to be inspected is placed between the two measuring mechanisms 1 and its center diameter is measured and compared using the measuring mechanisms 1. Furthermore, multiple groups of symmetrically arranged measuring mechanisms 1 can be arranged inside the outer frame 4 of the device, so that the center diameters of threads of different batches of workpieces to be inspected can be inspected simultaneously.

[0033] In some embodiments, Figure 2 As shown, before measuring the middle diameter of each workpiece 3 to be inspected, the operator first places a standard workpiece on the adjustment mechanism 2. At this time, the smart camera 51 is used to aim at the standard workpiece to take a picture, and the standard inspection height of the workpiece to be inspected is set, that is, the thread height of the subsequent workpiece 3 to be inspected is consistent with that of the standard workpiece. The light source board 52, the workpiece 3 to be inspected and the smart camera 51 are located on the same straight line, and the light source board 52 is used to supplement the light of the workpiece 3 to ensure the clarity of the picture taken by the smart camera.

[0034] In some embodiments, Figure 2 and Figure 3 As shown, after the inspected workpiece 3 is placed on the rotating disk 25, the smart camera 51 is used to take a picture of the inspected workpiece 3, and then the position image of the current inspected workpiece 3 is compared with the position image of the standard part, and the lifting driver 21 is started, and its output end drives the lifting rod 22 and the placement plate 23 to move up or down to change the height of the inspected workpiece 3, and the rotating driver 24 is started synchronously, and its output end drives the rotating disk 25 and the inspected workpiece 3 to rotate until the inspected workpiece 3 rotates to the same image position as the standard part.

[0035] In some embodiments, Figure 4 As shown, after the position of the workpiece 3 to be inspected is adjusted, the mobile driver 130 is started, and its output end drives the L-shaped mobile plate 131 and the supporting plate 132 fixed thereon to move close to the workpiece 3 to be inspected. At this time, the fixed block 140 on the upper end face of the supporting plate 132 and the slider 141 move synchronously, and the guide needle 147 and the measuring needle 146 inside the slider 141 gradually approach the outer wall of the workpiece 3 to be inspected. As can be seen from the figure, the length of the guide needle 147 is greater than the measuring needle 146, so the guide needle 147 will contact the workpiece 3 to be inspected first, and then the measuring needle 146 will move along the axial direction of the guide needle 147 to be close to the workpiece 3 to ensure that the measuring point of the measuring needle 146 is accurate.

[0036] In some embodiments, Figure 5As shown (part of the outer wall of the measuring block 144 is hidden in the figure), when the guide pin 147 contacts the outer wall of the workpiece 3 to be detected, it slides in the measuring block 144, and the guide spring 148 is compressed. At the same time, if the needle tip of the guide pin 147 first contacts the upper or lower edge of the thread of the workpiece 3 to be detected, the guide pin 147 will drive the entire measuring block 144 to move up or down slightly on the slide rail 149 under the push of the thread. The reset springs 145 fixed on the upper and lower sides of the measuring block 144 are suitable for keeping the measuring block 144 in the center of the slide rail 149 when the detection work is stopped. After the guide pin 147 contacts the outer wall of the workpiece 3 to be detected, the mobile driver 130 is continuously started, and the slider 141 slides on the carrier plate 132 to push the spring 148. 1a is compressed until the measuring needle 146 abuts against the outer wall of the workpiece 3 to be inspected, at which time the mobile driver 130 stops, and synchronously, in the initial state, the measuring end of the displacement sensor 142 is in contact with the vertical surface of the slider 141, at which time the displacement sensor 142 is started, and its measuring end measures the distance between the vertical surface of the slider 141, and this distance is the moving distance of the measuring needle 146. Since the displacement sensors 142 on both sides of the workpiece 3 to be inspected are fixed and stationary to the outer frame 4 of the equipment through the fixing rod 142a, the total distance between the two is fixed. At this time, the median diameter of the workpiece 3 to be inspected can be obtained by subtracting the moving distance of the two measuring needles 146 and the overall length of each displacement measuring component 14 from the total distance between the two displacement sensors.

[0037] In some embodiments, since the pitch diameter is the diameter of an imaginary cylinder where the widths of the grooves and protrusions on the thread profile are equal in the axial cross section, Figure 6 As shown, as a preference, the needle head of one of the measuring needles 146 in the two displacement measuring assemblies 14 can be set to be straight, and the needle head of the other measuring needle 146 can be provided with a notch that can accommodate the thread thickness of the workpiece 3 to be tested. When measuring, the measuring needle 146 with the straight needle head is inserted into the thread gap, and the other measuring needle 146 with the notch is abutted against the outer edge of the thread, and the distance between the two needle heads is the thread center diameter.

[0038] In some embodiments, in order to protect each measuring mechanism 1 , a protective shell 10 is sleeved on the top of the measuring block 144 in each measuring mechanism 1 to protect the entire measuring mechanism 1 .

[0039] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, terms such as "first", "second" and other numerical terms do not imply an order or sequence when used in this document unless explicitly indicated above. Therefore, without departing from the teachings of the example embodiments, the first element, component, region, layer or section discussed above may be referred to as a second element, component, region, layer or section.

[0041] Spatially relative terms, such as "inside", "outside", "below", "below", "down", "above", "on", etc., may be used herein to facilitate description of the relationship of one element or feature to another element or feature as illustrated in the figure. In addition to the orientation depicted in the figure, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is turned over, the elements described as "below" or "below" other elements or features will be oriented to be "above" other elements or features. Therefore, the example term "below" can cover the orientation above and below. The device can be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0042] In the above discussion, unless otherwise stated, the terms "about," "approximately," "substantially," etc., when used to describe a numerical value, mean a variation of + / - 10% of the value.

[0043] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A gear thread pitch diameter measuring device, characterized in that: include: An outer frame (4) of the device has an adjustment mechanism (2) and a group of symmetrically arranged measuring mechanisms (1) arranged therein; wherein The two measuring mechanisms (1) are respectively arranged on the left and right sides of the inspection station, and are suitable for measuring the thread diameter of the inspected workpiece (3); The adjustment mechanism (2) is suitable for being controlled by the control module before the two measuring mechanisms (1) start measuring, thereby driving the position of the inspected workpiece (3) to be adjusted and moving the inspected workpiece (3) to the measuring position; and The image acquisition mechanism (5) is located at one side of the detection station and is suitable for taking a picture of the detected workpiece (3) after the detected workpiece (3) is placed on the adjustment mechanism (2), and judging whether the current placement position of the detected workpiece (3) is the set position.

2. The gear thread pitch diameter measuring device according to claim 1, characterized in that: Each of the measuring mechanisms (1) comprises: A fixing frame (11) is arranged inside the outer frame (4) of the device and is located on one side of the workpiece (3) to be inspected; A fixed seat (12) is arranged on the upper end surface of the fixed frame (11), and a moving component (13) and a displacement measuring component (14) are arranged above the fixed seat (12); wherein The moving component (13) is suitable for driving the measuring needle (146) in the displacement measuring component (14) to move until the measuring needle (146) abuts against the workpiece (3) to be detected; and The displacement measuring component (14) measures the moving distance of the measuring needle (146) through the displacement sensor (142) under the control of the control module.

3. The gear thread pitch diameter measuring device according to claim 2, characterized in that: The moving component (13) comprises: A mobile driver (130), controlled by a control module and arranged on an upper end surface of the fixing seat (12); An L-shaped moving plate (131) is arranged on the upper end surface of the moving driver (130) and is connected to the output end of the moving driver (130); and The bearing plate (132) has a lower end surface connected to the L-shaped moving plate (131), and an upper end surface connected to a fixed block (140) in the displacement measuring assembly (14).

4. The gear thread pitch diameter measuring device according to claim 3, characterized in that: The displacement measurement component (14) comprises: A slider (141) has a lower end surface connected to the upper end surface of the bearing plate (132); wherein A cavity (143) is provided inside the sliding block (141), and a slide rail (149) is provided on the inner wall of the cavity (143); A measuring block (144) having one side surface slidably connected to the slide rail (149) and a measuring needle (146) disposed on the other side surface; and A pair of return springs (145) are respectively arranged on the upper and lower end surfaces of the measuring block (144), and are suitable for keeping the measuring block (144) stable on the slide rail (149).

5. The gear thread pitch diameter measuring device according to claim 4, characterized in that: The interior of the measuring block (144) is hollow, and a guide needle (147) is slidably connected to the interior of the measuring block (144); wherein One end of the guide needle (147) is located inside the measuring block (144), and the other end is located outside the measuring block (144) and parallel to the measuring needle (146); A guide spring (148) is arranged inside the measuring block (144), and one end of the guide spring (148) is connected to the inner wall of the measuring block (144), and the other end is connected to the measuring needle (146).

6. The gear thread pitch diameter measuring device according to claim 5, characterized in that: The displacement sensor (142) is controlled by a control module and is slidably connected to the fixed block (140); The detection end of the displacement sensor (142) faces the slider (141), and a fixing rod (142a) is provided at the end of the displacement sensor (142); wherein The fixing rod (142a) is suitable for being connected to the outer frame (4) of the device, thereby enabling the displacement sensor (142) to remain stationary during the movement of the fixing block (140).

7. The gear thread pitch diameter measuring device according to claim 1, characterized in that: The regulating mechanism (2) comprises: A placement rack (20) is arranged on the outer frame (4) of the device, and a lifting drive (21) is arranged inside the placement rack (20); wherein The lifting drive (21) is controlled by a control module, and an output end of the lifting drive (21) is connected to a placement plate (23) via a lifting rod (22).

8. The gear thread pitch diameter measuring device according to claim 7, characterized in that: The upper end surface of the placement plate (23) is provided with a rotation driver (24) which is controlled by a control module; wherein The output end of the rotary drive (24) is connected to a rotary disk (25); and The workpiece (3) to be inspected is placed on the upper end surface of the rotating disk (25).

9. The gear thread pitch diameter measuring device according to claim 1, characterized in that: The image acquisition mechanism (5) comprises: A first vertical plate (50) is arranged on one side of the workpiece (3) to be inspected, and a smart camera (51) is arranged on the first vertical plate (50); The second vertical plate (53) is arranged in a mirror image with the first vertical plate (50) with the workpiece (3) to be detected as the center, and a light source plate (52) is arranged on the second vertical plate (53).

10. A method for measuring the pitch diameter of a gear thread, characterized in that: The steps include: Step S1, placing the workpiece (3) to be inspected on the adjustment mechanism (2), taking a photo of the workpiece (3) to be inspected using the image acquisition mechanism, and comparing the photo with the set workpiece inspection position; Step S2, driving the workpiece (3) to be inspected to move by the adjusting mechanism (2), and adjusting the position of the workpiece (3) to be inspected to a set position; Step S3, measuring the thread diameter of the inspected workpiece (3) by means of the measuring mechanisms (1) on both sides of the inspected workpiece (3).

Images