An automatic internal and external diameter testing machine

Abstract

This utility model discloses an automatic internal and external diameter detection machine, including a frame on which both an internal diameter detection mechanism and an external diameter detection mechanism are mounted. This utility model innovatively adopts an integrated structural design that combines internal and external diameter detection functions. This design eliminates the cumbersome process of traditional step-by-step internal and external diameter detection, enabling high-precision measurement of the workpiece's internal and external diameters simultaneously in a single clamping operation at the same workstation, significantly improving detection efficiency, especially suitable for mass production scenarios. Simultaneously, this utility model uses a high-precision mechanical transmission unit to directly acquire workpiece dimensional information through a contact measurement principle, completely avoiding the problem of non-contact measurements such as lasers being easily affected by workpiece surface characteristics, ensuring stable and reliable measurement results. Furthermore, the positions of the measuring contacts and measuring plates can be quickly and flexibly adjusted according to the dimensional requirements of different workpiece specifications, allowing a single device to cover the mass detection needs of multiple workpiece specifications.

Description

Technical Field

[0001] This utility model relates to the field of workpiece measurement technology, specifically to an automatic internal and external diameter detection machine. Background Technology

[0002] The inspection of the inner and outer diameters of workpieces is crucial in manufacturing, directly affecting the product's fitting accuracy, functionality, and lifespan. Various inspection methods exist, each with its inherent advantages and disadvantages. These methods can be categorized into contact and non-contact measurement. Contact methods typically employ micrometers or coordinate measuring machines (CMMs). However, micrometers rely on manual readings, resulting in low efficiency and susceptibility to human error, impacting measurement accuracy. While CMMs are widely used and structurally precise, they are not specifically designed for inner and outer diameter measurement. Non-contact methods often utilize laser measuring instruments. These instruments emit laser light, which is refracted by the workpiece, and the reflected signal is received for measurement. However, receiving reflected or scattered light from the workpiece surface is susceptible to variations in surface reflection characteristics, such as color and slope, leading to high noise levels and difficulties in noise signal processing. Furthermore, existing inspection equipment typically only measures the inner or outer diameter separately. When both diameters need to be measured simultaneously, separate inner and outer diameter inspection processes are required, resulting in low efficiency. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing an automatic internal and external diameter testing machine to solve the problems mentioned in the background art.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] An automatic internal and external diameter detection machine includes a frame, on which an internal diameter detection mechanism and an external diameter detection mechanism are mounted;

[0006] The inner diameter detection mechanism includes two first drive cylinders arranged opposite each other. Each first drive cylinder is connected to a first transmission unit. A measuring contact is installed on the first transmission unit. The two measuring contacts are arranged in opposite directions. A first displacement sensor is also installed on one side of the first transmission unit. The first drive cylinder is used to drive the measuring contact on the first transmission unit to move in order to detect the inner diameter of the workpiece.

[0007] The outer diameter detection mechanism includes a second transmission unit mounted on a frame. Two measuring plates are arranged opposite each other on the second transmission unit. One of the measuring plates is connected to a second drive cylinder and a second displacement sensor. The second drive cylinder is used to drive the measuring plate on the second transmission unit to move in order to detect the outer diameter of the workpiece.

[0008] As a preferred embodiment of an automatic internal and external diameter testing machine, the first transmission unit includes a base, a movable frame mounted on the base, a shoulder mounted on the movable frame, a measuring contact mounted on one end of the shoulder, a first lever arm hinged to the base so that the first lever arm can rotate around the base, the output end of the first drive cylinder passes through the movable frame and is connected to one end of the first lever arm, the other end of the first lever arm is connected to a second lever arm, the end of the second lever arm away from the first lever arm is connected to the top inner wall of the movable frame, and the detection end of the first displacement sensor passes through the movable frame and is connected to one side of the second lever arm.

[0009] As a preferred embodiment of the automatic internal and external diameter testing machine, the first transmission unit further includes a reset assembly, which includes a reset plate mounted on the base. The top inner wall of the movable frame is provided with a moving groove, the top of the reset plate is located in the moving groove, and the moving groove extends along the length direction of the movable frame, such that the length of the moving groove is greater than the moving distance of the measuring contact. A spring rod is installed on one side of the second lever arm, a spring is installed at one end of the spring rod, and the other end of the spring is connected to the reset plate.

[0010] As a preferred embodiment of the automatic internal and external diameter detection machine, a first support plate is installed on the base, a U-shaped groove is opened on the top of the first support plate, the middle part of the first lever arm is hinged to the U-shaped groove, a second support plate is also installed on one side of the base, and the first drive cylinder and the first displacement sensor are both installed on the second support plate.

[0011] As a preferred embodiment of the automatic internal and external diameter inspection machine, the movable frame has an inverted U-shaped structure, with the bottom two ends of the movable frame correspondingly connected to the two ends of the base, and the movable frame is made of elastic material.

[0012] As a preferred embodiment of the automatic internal and external diameter testing machine, the frame is further equipped with a position adjustment mechanism. The position adjustment mechanism includes a first mounting base, on which an adjusting screw is mounted. Two slides are connected to the adjusting screw, and each slide is equipped with a first movable seat. The first movable seat has a sliding groove, which is perpendicular to the adjusting screw. A second movable seat is slidably connected to the sliding groove, and the first transmission unit is mounted on the second movable seat.

[0013] As a preferred embodiment of the automatic internal and external diameter testing machine, a handwheel is installed at one end of the adjusting screw, and a first guide rail is also installed on the first mounting base. The first guide rail is arranged parallel to the adjusting screw, and two first sliders are slidably connected on the first guide rail. The first sliders are connected to the first movable base.

[0014] As a preferred embodiment of an automatic internal and external diameter testing machine, the second transmission unit includes a second mounting base, on which several second guide rails are mounted. Each second guide rail is equipped with two second sliders, which are correspondingly connected to two measuring plates. A rack is mounted on the bottom of each of the two measuring plates, and the two racks are arranged in a staggered manner. A gear is movably mounted between the two racks on the second mounting base, and the gear meshes with the two racks respectively.

[0015] As a preferred embodiment of the automatic internal and external diameter testing machine, a placement plate is also installed on the second mounting base. The workpiece is placed in the middle of the placement plate, and two measuring plates are located at both ends of the placement plate. Through holes are opened on the placement plate and the second mounting base corresponding to the workpiece positions. The measuring contact protrudes from the through holes and is located inside the workpiece.

[0016] As a preferred embodiment of an automatic internal and external diameter testing machine, an arc-shaped plate is installed on the measuring plate at the position corresponding to the workpiece, and the arc-shaped plate can fit against the workpiece.

[0017] The beneficial effects of this utility model are:

[0018] This utility model addresses the problems of limited functionality and susceptibility to interference in existing internal and external diameter testing equipment by innovatively adopting an integrated structural design that combines internal and external diameter testing functions. This design eliminates the cumbersome process of performing internal and external diameter testing step by step in the traditional method. It can simultaneously complete high-precision measurement of the workpiece's internal and external diameters in a single clamping and at the same workstation, significantly improving testing efficiency and making it particularly suitable for mass production scenarios.

[0019] Meanwhile, this utility model adopts a high-precision mechanical transmission unit to directly obtain workpiece size information through contact measurement principle, completely avoiding the problem that non-contact measurement such as laser is easily affected by the surface characteristics of the workpiece, ensuring stable and reliable measurement results; in addition, the position of the measuring contact and the measuring plate can be quickly and flexibly adjusted according to the size requirements of different specifications of workpieces, and one device can cover the large-scale inspection needs of multiple specifications of workpieces, avoiding the cost and complexity of purchasing or switching multiple special equipment. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments of this utility model will be briefly described below. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the automatic inner and outer diameter detection machine described in this utility model.

[0022] Figure 2 This is a schematic diagram of the structure of the inner diameter detection mechanism and the outer diameter detection mechanism described in this utility model.

[0023] Figure 3 This is a schematic diagram of the internal diameter detection mechanism described in this utility model.

[0024] Figure 4 This is a schematic diagram showing the disassembled structure of the inner diameter detection mechanism and the position adjustment mechanism described in this utility model.

[0025] Figure 5 This is a schematic diagram of the combined structure of the outer diameter detection mechanism described in this utility model.

[0026] Figure 6 This is a schematic diagram showing the disassembled structure of the outer diameter detection mechanism described in this utility model.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Rack;

[0029] 2. Inner diameter detection mechanism; 21. First drive cylinder; 22. First transmission unit; 221. Base; 222. Moving frame; 223. Shoulder seat; 224. First lever arm; 225. Second lever arm; 226. Reset plate; 227. Spring rod; 228. Spring; 229. First support plate; 2210. Second support plate; 23. Measuring contact; 24. First displacement sensor;

[0030] 3. Outer diameter detection mechanism; 31. Second transmission unit; 311. Second mounting base; 312. Second guide rail; 313. Second slider; 314. Rack; 315. Gear; 32. Measuring plate; 33. Second drive cylinder; 34. Second displacement sensor; 35. Placement plate; 36. Arc plate;

[0031] 4. Position adjustment mechanism; 41. First mounting base; 42. Adjusting screw; 43. Slide; 44. First movable base; 45. Second movable base; 46. Handwheel; 47. First guide rail; 48. First slider;

[0032] 100. Workpiece. Detailed Implementation

[0033] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0034] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of this utility model, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0035] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0036] In the description of this utility model, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating the connection relationship between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] like Figure 1 and Figure 2 As shown, this utility model provides an automatic inner and outer diameter detection machine, including a frame 1, on which an inner diameter detection mechanism 2 and an outer diameter detection mechanism 3 are installed simultaneously, with the inner diameter detection mechanism 2 and the outer diameter detection mechanism 3 distributed vertically.

[0038] The inner diameter detection mechanism 2 specifically includes two first drive cylinders 21 spaced apart and arranged opposite each other in the middle of the frame 1. Both first drive cylinders 21 are connected to a first transmission unit 22. Measuring contacts 23 are installed on the first transmission unit 22. The two measuring contacts 23 are located inside the workpiece 100 and are arranged back to back. When the first drive cylinder 21 is started, the first drive cylinder 21 will drive the two measuring contacts 23 to move horizontally back to back through the first transmission unit 22 until they contact the inner walls on both sides of the workpiece 100. At the same time, a first displacement sensor 24 is also installed on one side of the first transmission unit 22. The first displacement sensor 24 can measure the precise displacement of the measuring contacts 23. Based on this displacement data, the control system calculates the inner diameter value of the workpiece 100 by combining the preset measurement benchmark and algorithm.

[0039] The outer diameter detection mechanism 3 specifically includes a second transmission unit 31 mounted on the frame 1. Two measuring plates 32 are spaced apart and arranged opposite each other on the second transmission unit 31. One of the measuring plates 32 is connected to a second drive cylinder 33. When the second drive cylinder 33 is started, it will drive the two measuring plates 32 to move horizontally towards each other through the second transmission unit 31 until they contact the outer walls on both sides of the workpiece 100. At the same time, the measuring plate 32 is also connected to a second displacement sensor 34. The second displacement sensor 34 can measure the precise displacement of the measuring plate 32. Based on this displacement data, the control system calculates the outer diameter value of the workpiece 100 by combining the preset measurement benchmark and algorithm.

[0040] This embodiment addresses the problems of limited functionality and susceptibility to interference in existing internal and external diameter testing equipment by innovatively adopting an integrated structural design that combines internal and external diameter testing functions. This design eliminates the cumbersome process of performing internal and external diameter testing step by step in the traditional method. It can simultaneously complete high-precision measurement of the workpiece's internal and external diameters in a single clamping and at the same workstation, significantly improving testing efficiency and making it particularly suitable for mass production scenarios.

[0041] like Figure 3 As shown, the first transmission unit 22 in this embodiment preferably adopts the following structure:

[0042] The first transmission unit 22 includes a base 221, on which a movable frame 222 is mounted. The movable frame 222 preferably has an inverted U-shaped structure, with its bottom ends corresponding to the ends of the base 221. A shoulder seat 223 is also mounted on the movable frame 222, and a measuring contact 23 is mounted on one end of the shoulder seat 223. A first lever arm 224 is hinged to the base 221, allowing the first lever arm 224 to rotate around the base 221. The output end of the first drive cylinder 21 passes through the movable frame 222 and connects to one end of the first lever arm 224. A second lever arm 225 is connected to the other end of the first lever arm 224, with the end of the second lever arm 225 away from the first lever arm 224 connected to the movable frame 222. The top inner wall of 2 is connected, and the detection end of the first displacement sensor 24 passes through the moving frame 222 and is connected to one side of the second lever arm 225. When it is necessary to detect the inner diameter of the workpiece 100, the first drive cylinder 21 will apply a thrust to one end of the first lever arm 224, and the other end of the first lever arm 224 will apply an opposite thrust to the second lever arm 225. Since the second lever arm 225 is connected to the moving frame 222, the upper end of the moving frame 222, as well as the shoulder seat 223 and the measuring contact 23 on the moving frame 222, will move horizontally under the action of the thrust. At the same time, the second lever arm 225 will also drive the detection end of the first displacement sensor 24 to move, thereby measuring the displacement of the measuring contact 23.

[0043] To ensure the sustainability of inner diameter measurement, the first transmission unit 22 in this embodiment also includes a reset component. The reset component can ensure that the moving frame 222, the shoulder seat 223 on the moving frame 222, and the measuring contact 23 are automatically reset after the test is completed, so as to facilitate the next test.

[0044] Specifically, the reset assembly includes a reset plate 226 mounted on the base 221, a spring rod 227 mounted on one side of the second lever arm 225, a spring 228 mounted on one end of the spring rod 227, and the other end of the spring 228 connected to the reset plate 226. When the second lever arm 225 is displaced under the thrust of the first lever arm 224, the spring 228 will be in a stretched state. After the measurement is completed, the first drive cylinder 21 returns to its original position. At this time, the thrust on the second lever arm 225 disappears, and the second lever arm 225 and the moving frame 222 will be reset under the elastic force of the spring 228.

[0045] Preferably, the movable frame 222 in this embodiment is made of an elastic material, so that the movable frame 222 can return to its original shape after displacement and deformation under the thrust of the second lever arm 225. At the same time, during the detection process, the reset plate 226, as the fixed end of the spring 228, needs to remain stationary. Therefore, a movable groove is provided on the top inner wall of the movable frame 222, the top of the reset plate 226 is located in the movable groove, and the movable groove extends along the length direction of the movable frame 222, so that the length of the movable groove is greater than the moving distance of the measuring contact 23, thereby avoiding the movable frame 222 from affecting the reset plate 226 during the movement.

[0046] To enable the rotation function of the first lever arm 224, a first support plate 229 is installed on the base 221 in this embodiment. A U-shaped groove is provided on the top of the first support plate 229, and the middle part of the first lever arm 224 is hinged to the U-shaped groove. To facilitate the installation of the first drive cylinder 21 and the first displacement sensor 24, a second support plate 2210 is also installed on one side of the base 221. The first drive cylinder 21 and the first displacement sensor 24 are both installed on the second support plate 2210.

[0047] To meet the testing requirements of workpieces 100 of various specifications, a position adjustment mechanism 4 is also installed on the frame 1 in this embodiment. The position adjustment mechanism 4 can adjust the position of the first transmission unit 22 and the measuring contact 23 according to the size requirements of workpieces 100 of different specifications, thereby improving the applicability of the equipment.

[0048] like Figure 4 As shown, the position adjustment mechanism 4 specifically includes a first mounting base 41, on which an adjustment screw 42 is mounted. Two slides 43 are connected to the adjustment screw 42, and each slide 43 is equipped with a first movable seat 44. The first movable seat 44 can follow the slide 43 and move along the X-axis direction on the adjustment screw 42. To facilitate the adjustment of the adjustment screw 42, a handwheel 46 is also mounted on one end of the adjustment screw 42. The position of the first movable seat 44 can be adjusted by rotating the handwheel 46.

[0049] Meanwhile, a sliding groove is provided on the first movable seat 44, which is perpendicular to the adjusting screw 42, and the second movable seat 45 is slidably connected to the sliding groove. The second movable seat 45 can move along the Y-axis on the first movable seat 44. The first transmission unit 22 and the measuring contact 23 are installed on the second movable seat 45. By adjusting the first movable seat 44 and the second movable seat 45, the horizontal position of the measuring contact 23 can be quickly and flexibly adjusted.

[0050] To improve the stability of the first movable seat 44, a first guide rail 47 is also installed on the first mounting base 41 in this embodiment. The first guide rail 47 is arranged parallel to the adjusting screw 42, and two first sliders 48 are slidably connected on the first guide rail 47. The first sliders 48 are connected to the first movable seat 44. When the first movable seat 44 is displaced under the driving action of the adjusting screw 42, the first guide rail 47 can provide guidance for it.

[0051] Preferably, in this embodiment, a sliding groove can be used instead of the first guide rail 47, or a combination of the first guide rail 47 and the sliding groove can be used to further improve the stability of the first movable seat 44. By opening a sliding groove on the first mounting seat 41, two third sliders are slidably connected in the sliding groove. The two third sliders are correspondingly connected to the two first movable seats 44, thereby further strengthening the guiding effect on the first movable seat 44.

[0052] like Figure 5 and Figure 6 As shown, the second transmission unit 31 in this embodiment specifically includes a second mounting base 311. A plurality of second guide rails 312 are mounted on the second mounting base 311. Each second guide rail 312 has two second sliders 313 mounted on it. The two second sliders 313 are correspondingly connected to two measuring plates 32. A rack 314 is mounted on the bottom of each of the two measuring plates 32. The two racks 314 are arranged in a staggered manner. A gear 315 is movably mounted on the second mounting base 311 between the two racks 314. The gear 315 is respectively connected to the two racks. When the outer diameter of the workpiece 100 needs to be detected, the second drive cylinder 33 will apply a thrust to one of the measuring plates 32. During the movement of the measuring plate 32, the rack 314 at its bottom will drive the gear 315 to rotate. During the rotation of the gear 315, the other rack 314 will be driven to move in the opposite direction, thereby driving the two measuring plates 32 to move horizontally towards each other. At the same time, the measuring plate 32 will drive the detection end of the second displacement sensor 34 to move, thereby measuring the displacement of the measuring plate 32.

[0053] Preferably, since the workpiece 100 has a circular structure, the measuring plate 32 in this embodiment is also equipped with an arc plate 36 at the position corresponding to the workpiece 100. The arc plate 36 can be completely fitted with the workpiece 100, thereby improving the measurement accuracy.

[0054] Meanwhile, a placement plate 35 is also installed on the second mounting base 311. The workpiece 100 is placed in the middle of the placement plate 35. Two measuring plates 32 are located at both ends of the placement plate 35. The placement plate 35 and the second mounting base 311 are provided with through holes corresponding to the positions of the workpiece 100. The measuring contact 23 can protrude out of the through hole and enter the interior of the workpiece 100. In use, the inner and outer diameters of the workpiece 100 can be detected synchronously by simultaneously starting the first driving cylinder 21 and the second driving cylinder 33.

[0055] It should be stated that the above-described specific embodiments are merely preferred embodiments of this utility model and the technical principles employed. Those skilled in the art should understand that various modifications, equivalent substitutions, and variations can be made to this utility model. However, such variations, as long as they do not depart from the spirit of this utility model, should be within the protection scope of this utility model. Furthermore, some terminology used in this application specification and claims is not limiting, but merely for ease of description.

Claims

1. An internal and external diameter automatic detection machine characterized by, Includes a frame (1), on which an inner diameter detection mechanism (2) and an outer diameter detection mechanism (3) are installed; The inner diameter detection mechanism (2) includes two first drive cylinders (21) arranged opposite to each other. Each first drive cylinder (21) is connected to a first transmission unit (22). A measuring contact (23) is installed on the first transmission unit (22). The two measuring contacts (23) are arranged in opposite directions. A first displacement sensor (24) is also installed on one side of the first transmission unit (22). The first drive cylinder (21) is used to drive the measuring contact (23) on the first transmission unit (22) to move in order to detect the inner diameter of the workpiece (100). The outer diameter detection mechanism (3) includes a second transmission unit (31) mounted on a frame (1). Two measuring plates (32) are arranged opposite each other on the second transmission unit (31). One of the measuring plates (32) is connected to a second drive cylinder (33) and a second displacement sensor (34). The second drive cylinder (33) is used to drive the measuring plate (32) on the second transmission unit (31) to move in order to detect the outer diameter of the workpiece (100).

2. The inside and outside diameter automatic detection machine according to claim 1, wherein, The first transmission unit (22) includes a base (221), a movable frame (222) is mounted on the base (221), a shoulder seat (223) is mounted on the movable frame (222), a measuring contact (23) is mounted on one end of the shoulder seat (223), a first lever arm (224) is hinged to the base (221) so that the first lever arm (224) can rotate around the base (221), the output end of the first drive cylinder (21) passes through the movable frame (222) and is connected to one end of the first lever arm (224), the other end of the first lever arm (224) is connected to a second lever arm (225), the end of the second lever arm (225) away from the first lever arm (224) is connected to the top inner wall of the movable frame (222), and the detection end of the first displacement sensor (24) passes through the movable frame (222) and is connected to one side of the second lever arm (225).

3. The inside and outside diameter automatic detection machine according to claim 2, wherein, The first transmission unit (22) further includes a reset assembly, which includes a reset plate (226) mounted on the base (221). The top inner wall of the movable frame (222) is provided with a moving groove. The top of the reset plate (226) is located in the moving groove, and the moving groove extends along the length direction of the movable frame (222), such that the length of the moving groove is greater than the moving distance of the measuring contact (23). A spring rod (227) is installed on one side of the second lever arm (225). A spring (228) is installed at one end of the spring rod (227), and the other end of the spring (228) is connected to the reset plate (226).

4. The inside and outside diameter automatic detecting machine according to claim 2, wherein A first support plate (229) is installed on the base (221). A U-shaped groove is provided above the first support plate (229). The middle part of the first lever arm (224) is hinged to the U-shaped groove. A second support plate (2210) is also installed on one side of the base (221). The first drive cylinder (21) and the first displacement sensor (24) are both installed on the second support plate (2210).

5. The inside and outside diameter automatic detecting machine according to claim 2, wherein, The movable frame (222) has an inverted U-shaped structure. The bottom two ends of the movable frame (222) are connected to the two ends of the base (221) respectively. The movable frame (222) is made of elastic material.

6. The inside and outside diameter automatic detecting machine according to claim 1, wherein, The frame (1) is also equipped with a position adjustment mechanism (4). The position adjustment mechanism (4) includes a first mounting base (41). An adjustment screw (42) is mounted on the first mounting base (41). Two slides (43) are connected to the adjustment screw (42). A first movable seat (44) is mounted on each slide (43). A sliding groove is provided on the first movable seat (44). The sliding groove is perpendicular to the adjustment screw (42). A second movable seat (45) is slidably connected to the sliding groove. The first transmission unit (22) is mounted on the second movable seat (45).

7. The inside and outside diameter automatic detecting machine according to claim 6, wherein A handwheel (46) is installed at one end of the adjusting screw (42), and a first guide rail (47) is also installed on the first mounting base (41). The first guide rail (47) is parallel to the adjusting screw (42), and two first sliders (48) are slidably connected on the first guide rail (47). The first sliders (48) are connected to the first moving base (44).

8. The inside and outside diameter automatic detecting machine according to claim 1, wherein, The second transmission unit (31) includes a second mounting base (311), on which a plurality of second guide rails (312) are mounted. Each second guide rail (312) is equipped with two second sliders (313). The two second sliders (313) are connected to the two measuring plates (32) respectively. The bottom of each of the two measuring plates (32) is equipped with a rack (314). The two racks (314) are arranged in a staggered manner. A gear (315) is movably arranged between the two racks (314) on the second mounting base (311). The gear (315) meshes with the two racks (314) respectively.

9. The inside and outside diameter automatic detecting machine according to claim 8, wherein, The second mounting base (311) is also equipped with a placement plate (35), the workpiece (100) is placed in the middle of the placement plate (35), the two measuring plates (32) are located at the two ends of the placement plate (35), the placement plate (35) and the second mounting base (311) are provided with through holes corresponding to the position of the workpiece (100), and the measuring contact (23) protrudes from the through hole and is located inside the workpiece (100).

10. The inside and outside diameter automatic detecting machine according to claim 1, wherein, The measuring plate (32) is equipped with an arc plate (36) at the position corresponding to the workpiece (100), and the arc plate (36) can fit against the workpiece (100).

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