Inner hole measuring device

Abstract

An inner hole measuring device comprises a calculation control unit, a shell, an optical imaging assembly and a structured light generator assembly, the optical imaging assembly and the structured light generator assembly are coaxially arranged in the shell, and the optical imaging assembly comprises a main reflection cone, a camera and an image sensor; the structured light generator assembly comprises a structured light reflection cone, a collimation light generator, a photoelectric emitter and a photoelectric receiver; the photoelectric emitter is arranged on one of the upper side and the lower side of the camera, the photoelectric receiver is arranged on one of the upper side and the lower side of the collimated light generator, and the photoelectric emitter and the photoelectric receiver are oppositely arranged on the same side of the camera and the collimated light generator; the photoelectric receiver is connected with the collimated light generator; the calculation control unit is connected with the camera and the photoelectric emitter and used for calculating the workpiece inner hole diameter and contour deviation related geometric quantity according to the image signal generated by the image sensor.

Description

Technical Field

[0001] This utility model relates to the field of precision measurement, and particularly to the field of precision measurement of internal holes in optical imaging. Background Technology

[0002] With the development of the equipment manufacturing industry, the accurate measurement of deep hole diameters and internal profiles has become increasingly important. In the field of non-contact measurement, due to the narrow space for internal hole dimensions, measurement methods used for external surfaces (such as 3D scanning) are usually not directly applicable. Among the common non-contact measurement methods for hole geometry of parts, there is currently no universally applicable device with a compact structure, especially suitable for deep hole measurement. Existing technologies, both domestically and internationally, include many techniques for internal hole measurement using laser triangulation principles, but these either have problems such as being too large for smaller parts, having complex structures unsuitable for industrial applications, or failing to achieve online real-time detection and calculation. Utility Model Content

[0003] To address the aforementioned problems, this utility model discloses an internal hole measuring device, comprising a calculation and control unit, a housing, and an optical imaging assembly and a structured light generator assembly coaxially disposed within the housing, wherein...

[0004] The optical imaging components include a primary reflector cone, a camera, and an image sensor within the camera;

[0005] The structured light generator assembly includes a structured light reflector cone, a collimating light generator, a photoelectric emitter, and a photoelectric receiver;

[0006] The structured light reflecting cone is used to reflect the collimated light beam emitted by the collimating light generator to form a structured light ring at the measurement location on the inner surface of the workpiece. The main reflecting cone is used to reflect the light scattered from the structured light ring onto the main reflecting cone. The camera and image sensor are used to receive the structured light ring reflected by the main reflecting cone to obtain image signals.

[0007] The photoelectric transmitter is disposed on one of the upper and lower sides of the camera, and the photoelectric receiver is disposed on one of the upper and lower sides of the collimating light generator, with the photoelectric transmitter and the photoelectric receiver located on the same side of the camera and the collimating light generator and facing each other.

[0008] The photodetector is connected to the collimating light generator;

[0009] The calculation and control unit is connected to the camera and the photoelectric transmitter, and is used to calculate the relevant geometric quantities of the workpiece inner hole diameter and contour deviation based on the image signal.

[0010] In one embodiment of the internal hole measuring device of this utility model, the camera, main reflector cone, structured light reflector cone and collimating light generator are arranged sequentially from one side of the axis to the opposite side, or the camera, main reflector cone, collimating light generator and structured light reflector cone are arranged sequentially from one side of the axis to the opposite side.

[0011] In one embodiment of the internal hole measuring device of the present invention, the housing further includes a camera support, a light-transmitting cover, and a collimating light generator support. The camera support is used to support and fix the camera, and the collimating light generator support is used to support and fix the collimating light generator. The light-transmitting cover is fixed to the camera support and the collimating light generator support, and together with the camera support and the collimating light generator support, forms a first chamber for accommodating the camera, the image sensor, the collimating light generator, and the interconnected main reflection cone and the structured light reflection cone.

[0012] In one embodiment of the internal hole measuring device of the present invention, the photoelectric transmitter and the photoelectric receiver, which are located opposite each other on the same side of the camera and the collimating light generator, further include:

[0013] The photoelectric transmitter is disposed between the camera support and the light-transmitting cover, with the center of the photoelectric transmitter located between the extended surfaces of the inner and outer walls of the light-transmitting cover. The photoelectric receiver is disposed between the collimating light generator support and the light-transmitting cover, with the center of the photoelectric transmitter located between the extended surfaces of the inner and outer walls of the light-transmitting cover. The control light emitted by the photoelectric transmitter is transmitted through the inside of the light-transmitting cover and then received by the photoelectric receiver.

[0014] In one embodiment of the internal hole measuring device of the present invention, the photoelectric transmitter and the photoelectric receiver, which are located opposite each other on the same side of the camera and the collimating light generator, further include:

[0015] The photoelectric transmitter is disposed in the camera support body, and the photoelectric receiver is disposed in the collimating light generator support body. The control light emitted by the photoelectric transmitter is received by the photoelectric receiver after diffuse reflection through the inner hole of the workpiece.

[0016] In one embodiment of the internal hole measuring device of the present invention, the photoelectric transmitter and the photoelectric receiver, which are located opposite each other on the same side of the camera and the collimating light generator, further include:

[0017] The housing also includes a photoelectric transmitter support and a photoelectric receiver support. The photoelectric transmitter support is fixed to the outside of the camera support and is used to fix and support the photoelectric transmitter inside. The photoelectric receiver support is fixed to the outside of the collimating light generator support and is used to fix and support the photoelectric receiver inside. The control light emitted by the photoelectric transmitter is directly received by the photoelectric receiver without being blocked or reflected.

[0018] In one embodiment of the internal hole measuring device of the present invention, a structured light controller and a battery are disposed inside the collimating light generator support, wherein the structured light controller is connected to the collimating light generator, the photodetector and the battery, and the battery is used to power the collimating light generator, the structured light controller and the photodetector.

[0019] In one embodiment of the internal hole measuring device of this utility model, the collimating light generator is either a collimating laser or a collimating LED light source device.

[0020] In one embodiment of the above-mentioned internal hole measuring device of this utility model, the reflective surface of the structured light reflecting cone is a conical surface, the conical surface is a straight conical surface with a half cone angle of 45 degrees, and the reflective surface of the main reflecting cone is any one of a parabolic surface of revolution, a hyperbolic surface of revolution, or a straight conical surface of revolution.

[0021] In one embodiment of the internal hole measuring device of the present invention, the housing further includes a first housing and a second housing. The first housing includes the camera support and a first light-transmitting cover. The camera and image sensor are disposed in a second chamber formed by the camera support, the first light-transmitting cover, and the main reflector cone. The camera support, the first light-transmitting cover, the main reflector cone, the photoelectric emitter, the camera, and the image sensor together constitute a first connecting body. The second housing includes the collimating light generator support and the second light-transmitting cover. The collimating light generator is disposed in a third chamber formed by the collimating light generator support, the second light-transmitting cover, and the structured light reflector cone. The collimating light generator support, the second light-transmitting cover, the photoelectric receiver, the structured light reflector cone, and the collimating light generator together constitute a second connecting body. The first connecting body and the second connecting body are detachably connected via the main reflector cone and the structured light reflector cone.

[0022] In one embodiment of the internal hole measuring device of the present invention, the first housing further includes a photoelectric emitter support, and the camera and image sensor are disposed in the second chamber formed by the camera support, the photoelectric emitter support, the first light-transmitting cover, and the main reflector cone. The camera support, the first light-transmitting cover, the main reflector cone, the photoelectric emitter, the photoelectric emitter support, the camera, and the image sensor together constitute a first connecting body. The second housing further includes a photoelectric receiver support, and a collimating light generator is disposed in the third chamber formed by the collimating light generator support, the photoelectric receiver support, the second light-transmitting cover, and the structured light reflector cone. The collimating light generator support, the second light-transmitting cover, the photoelectric receiver, the photoelectric receiver support, the structured light reflector cone, and the collimating light generator together constitute a second connecting body. The first connecting body and the second connecting body are connected by a detachable or fixed method.

[0023] In one embodiment of the above-described internal bore measuring device of this utility model, the first connecting body and the second connecting body are connected by a detachable or fixed manner, further comprising:

[0024] The primary reflector cone of the first connector and the structured light reflector cone of the second connector, or

[0025] The primary reflector cone of the first connector and the collimating light generator support of the second connector or

[0026] The main reflective cone of the first connector and the structured light connector of the second connector are connected by a detachable method, a fixed method, or an integrated method.

[0027] The structured light connector and the second light-transmitting cover are connected to the structured light reflecting cone.

[0028] In one embodiment of the internal hole measuring device of the present invention, a measuring range shim is further included between the first connecting body and the second connecting body for changing the measuring range of the internal hole of the workpiece.

[0029] The main reflector cone, the range shim, and the structured light reflector cone are located or

[0030] The main reflector cone, the range shim, and the collimating light generator support are located or

[0031] The main reflector cone, the range pad, and the structured light connector are connected in a detachable manner.

[0032] In one embodiment of the above-mentioned internal hole measuring device of this utility model, the effective light path portion of the first light-transmitting cover is a rotating body with equal wall thickness. The light scattered by the structured light ring passes through the first light-transmitting cover and is reflected by the main reflective cone into the camera. The portion of the light path entering the camera that covers the first light-transmitting cover is the effective light path portion.

[0033] In one embodiment of the above-mentioned internal hole measuring device of this utility model, the detachable connection includes connection by magnet, thread, elastic deformation or locking, and the fixed connection includes connection by bonding, welding or interference fit.

[0034] In one embodiment of the internal hole measuring device of the present invention, the wavelength range of the control light emitted by the photoelectric emitter does not overlap with the wavelength range of the camera, and the wavelength range of the light emitted by the collimating light generator is within the wavelength range of the camera.

[0035] In one embodiment of the internal hole measuring device of the present invention, the control light emitted by the photoelectric emitter is infrared light.

[0036] In one embodiment of the internal hole measuring device of the present invention, the structured light reflecting cone and the collimating light generator are an integrated structure.

[0037] The internal hole measuring device provided by this utility model is particularly suitable for measuring deep holes and pipes. The probe has a simple and compact structure, is portable, and can measure the geometric quantities of each measuring point on the cross section of the structured light ring of the workpiece in one go, with high measurement efficiency. Attached Figure Description

[0038] Figure 1 This is a cross-sectional schematic diagram of the internal hole measuring device according to the first embodiment of this utility model.

[0039] Figure 2 This is a cross-sectional schematic diagram of the internal hole measuring device according to the second embodiment of this utility model.

[0040] Figure 3 This is a cross-sectional schematic diagram of the internal hole measuring device according to the third embodiment of this utility model.

[0041] Figure 4 This is a cross-sectional schematic diagram of the internal hole measuring device according to the fourth embodiment of this utility model.

[0042] Figure 5 This is a cross-sectional schematic diagram of the internal hole measuring device according to the fifth embodiment of this utility model.

[0043] Figure 6 This is a cross-sectional schematic diagram of the internal hole measuring device according to the sixth embodiment of this utility model.

[0044] Figure 7 This is a cross-sectional schematic diagram of the internal hole measuring device according to the seventh embodiment of this utility model.

[0045] Figure 8 This is a cross-sectional schematic diagram of the internal hole measuring device according to the eighth embodiment of this utility model.

[0046] Figure 9 This is a cross-sectional schematic diagram of the internal hole measuring device according to the ninth embodiment of this utility model.

[0047] Figure 10 This is a cross-sectional schematic diagram of the internal hole measuring device according to the ninth embodiment of this utility model.

[0048] Figure 11 This is a schematic block diagram of the operation of the calculation and control unit of the internal hole measuring device according to an embodiment of the present invention.

[0049] Figure 12 This is a schematic diagram illustrating the calculation principle of physical coordinate reconstruction for an internal hole measuring device according to an embodiment of the present invention.

[0050] In the attached figures, the following labels are used:

[0051] 10: Internal Bore Measuring Device

[0052] 20: Shell

[0053] 20a: First shell

[0054] 20b: Second shell

[0055] 21: Camera support

[0056] 22: Light-transmitting cover

[0057] 22a: First light-transmitting cover

[0058] 22b: Second light-transmitting cover

[0059] 23: Collimating light generator support

[0060] 24a: First chamber

[0061] 24b: Second chamber

[0062] 24c: Third chamber

[0063] 25a: First connector

[0064] 25b: Second connector

[0065] 26: Photoelectric emitter support

[0066] 27: Optoelectronic receiver support

[0067] 30: Optical Imaging Components

[0068] 31: Principal Reflection Cone

[0069] 32: Camera

[0070] 33: Image Sensor

[0071] 34: Camera signal cable

[0072] 40: Structured light generator assembly

[0073] 41: Structured light reflection cone

[0074] 42: Collimating light generator

[0075] 43: Structured light control line

[0076] 44: Photoelectric transmitter

[0077] 45: Photoelectric receiver

[0078] 46: Structured light connector

[0079] 50: Computational Control Unit

[0080] 51: Central Control Module

[0081] 52: Interaction Processing Module

[0082] 53: Structured Light Control Module

[0083] 54: Image Processing Module

[0084] 55: Halo Extraction Module

[0085] 56: Physical Coordinate Reconstruction Module

[0086] 57: Geometric Quantity Calculation Module

[0087] 60: Workpiece

[0088] 60a: Surface of the inner hole of the workpiece

[0089] 70: Structured light ring

[0090] 80: Range gasket

[0091] 90: Structured Light Controller

[0092] 100: Battery

[0093] A: Axis Detailed Implementation

[0094] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that references to "an embodiment," "embodiment," "example embodiment," etc., in the specification refer to the described embodiment including specific features, structures, or characteristics, but not necessarily including these specific features, structures, or characteristics. Furthermore, such expressions do not refer to the same embodiment. Moreover, when describing specific features, structures, or characteristics in conjunction with embodiments, whether or not explicitly described, it is indicated that incorporating such features, structures, or characteristics into other embodiments is within the knowledge scope of those skilled in the art.

[0095] The specification and subsequent claims use certain terms to refer to specific modules, components, or parts. Those skilled in the art will understand that users or manufacturers may use different names or terms to refer to the same module, component, or part. This specification and subsequent claims do not distinguish modules, components, or parts by differences in name, but rather by differences in function. The terms "comprising" and "including" used throughout the specification and subsequent claims are open-ended and should be interpreted as "including but not limited to." Furthermore, the term "connection" here includes any direct and indirect means of connection. Indirect means of connection include connections via other means.

[0096] In the following description and claims, numerous terms will be used, which should be defined as having the following meanings. The singular forms “a” and “an” include plural referents, unless the context clearly specifies otherwise. “Optional” or “optionally” indicates that an event or situation subsequently described may or may not occur, and the description includes both the possibility that the event occurs and the possibility that the event does not occur.

[0097] Furthermore, in the description of this utility model, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", as well as "about", "approximately", "substantially", "left and right", etc., indicating the orientation or positional relationship or parameters, are all based on the orientation or positional relationship shown in the accompanying 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, a specific size, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0098] Please refer to Figure 1 , Figure 1 This is a cross-sectional schematic diagram of the internal hole measuring device 10 according to the first embodiment of the present invention.

[0099] This utility model discloses an internal hole measuring device 10, including a calculation and control unit 50, a housing 20, and an optical imaging assembly 30 and a structured light generator assembly 40 coaxially disposed within the housing 20.

[0100] The optical imaging assembly 30 includes a main reflector cone 31, a camera 32, and an image sensor 33 within the camera 32;

[0101] The structured light generator assembly 40 includes a structured light reflector cone 41, a collimating light generator 42, a photoelectric emitter 44, and a photoelectric receiver 45;

[0102] The structured light reflection cone 41 is used to reflect the collimated light beam emitted by the collimating light generator 42, forming a structured light ring 70 on the inner hole surface 60a of the workpiece to be measured. The main reflection cone 31 is used to reflect the light scattered from the structured light ring 70 onto the main reflection cone 31. The camera 32 and the image sensor 33 are used to receive the structured light ring 70 reflected by the main reflection cone 31 to obtain the image signal.

[0103] The photoelectric transmitter 44 is disposed on one of the upper and lower sides of the camera 32, and the photoelectric receiver 45 is disposed on one of the upper and lower sides of the collimating light generator 42. The photoelectric transmitter 44 and the photoelectric receiver 45 are located on the same side of the camera 32 and the collimating light generator 42 and are disposed opposite to each other.

[0104] The photoelectric receiver 45 is connected to the collimating light generator 42;

[0105] The calculation control unit 50 is connected to the camera 32 and the photoelectric transmitter 44 to calculate the relevant geometric quantities of the inner hole diameter and contour deviation of the workpiece 60 based on the image signal.

[0106] Specifically, the computing control unit 50 is connected to the camera 32 via the camera control line 34, and the computing control unit 50 is connected to the photoelectric emitter 44 via the structured light control line 43.

[0107] Depending on the shape of the inner hole of the workpiece 60 to be measured, the overall shape of the structured light ring 70 formed by the structured light reflection cone 41 at the measurement location on the inner hole surface 60a of the workpiece can be a circle or other curves that are adapted to the cross-section of the inner hole. The specific shape will vary depending on the condition of the inner hole surface 60a of the workpiece.

[0108] In one embodiment of the internal hole measuring device of the present invention, the camera 32, the main reflection cone 31, the structured light reflection cone 41 and the collimating light generator 42 are arranged sequentially from one side of the axis to the opposite side, or the camera 32, the main reflection cone 31, the collimating light generator 42 and the structured light reflection cone 41 are arranged sequentially from one side of the axis to the opposite side.

[0109] In one embodiment of the internal hole measuring device 10 of the present invention, the housing 20 further includes a camera support 21, a light-transmitting cover 22, and a collimating light generator support 23. The camera support 21 is used to support and fix the camera 32, and the collimating light generator support 23 is used to support and fix the collimating light generator 42. The light-transmitting cover 22 is fixed to the camera support 21 and the collimating light generator support 23, and together with the camera support 21 and the collimating light generator support 23, forms a first chamber 24a for accommodating the camera 32, the image sensor 33, the collimating light generator 42, and the interconnected main reflection cone 31 and structured light reflection cone 41.

[0110] In one embodiment of the internal hole measuring device 10 of this utility model, the photoelectric emitter 44 and photoelectric receiver 45, which are arranged opposite each other on the same side of the camera 32 and the collimating light generator 42, further include:

[0111] The photoelectric transmitter 44 is disposed between the camera support 21 and the light-transmitting cover 22, with the center of the photoelectric transmitter 44 located between the extended surfaces of the inner and outer walls of the light-transmitting cover 22. The photoelectric receiver 45 is disposed between the collimating light generator support 23 and the light-transmitting cover 22, with the center of the photoelectric transmitter 44 located between the extended surfaces of the inner and outer walls of the light-transmitting cover 22. The control light emitted by the photoelectric transmitter 44 is transmitted through the inside of the light-transmitting cover 22 and then received by the photoelectric receiver 45, which is used to control the collimating light generator.

[0112] Please refer to Figure 2 , Figure 2 This is a cross-sectional schematic diagram of the inner hole measuring device 10 according to the second embodiment of the present invention. To clearly show the structure of the device, the calculation and control unit 50, the workpiece 60 and the structured light ring 70 are omitted in the figure.

[0113] In one embodiment of the internal hole measuring device 10 of this utility model, the photoelectric emitter 44 and photoelectric receiver 45, which are arranged opposite each other on the same side of the camera 32 and the collimating light generator 42, further include:

[0114] The photoelectric transmitter 44 is disposed inside the camera support 21, and the photoelectric receiver 45 is disposed inside the collimating light generator support 23. The control light emitted by the photoelectric transmitter 44 is diffusely reflected by the inner hole of the workpiece 60 and then received by the photoelectric receiver 45 for controlling the collimating light generator.

[0115] Please refer to Figure 3 , Figure 3 This is a cross-sectional schematic diagram of the inner hole measuring device 10 according to the third embodiment of the present invention. To clearly show the structure of the device, the calculation and control unit 50, the workpiece 60 and the structured light ring 70 are omitted in the figure.

[0116] In one embodiment of the internal hole measuring device 10 of this utility model, the photoelectric emitter 44 and photoelectric receiver 45, which are arranged opposite each other on the same side of the camera 32 and the collimating light generator 42, further include:

[0117] The housing 20 also includes a photoelectric transmitter support 26 and a photoelectric receiver support 27. The photoelectric transmitter support 26 is fixed to the outside of the camera support 21 and is used to fix and support the photoelectric transmitter 44 inside it. The photoelectric receiver support 27 is fixed to the outside of the collimating light generator support 23 and is used to fix and support the photoelectric receiver 45 inside it. The control light emitted by the photoelectric transmitter 44 is directly received by the photoelectric receiver 45 without being blocked or reflected, and is used to control the collimating light generator.

[0118] In one embodiment of the internal hole measuring device 10 of the present invention, a structure light controller 90 and a battery 100 are disposed inside the collimating light generator support 23. The structure light controller 90 is connected to the collimating light generator 42, the photodetector 45 and the battery 100, and the battery 100 is used to supply power to the collimating light generator 42, the structure light controller 90 and the photodetector 45.

[0119] Specifically, the structured light controller 90 and / or battery 100 may be located inside or outside the collimating light generator support 23.

[0120] In one embodiment of the internal hole measuring device 10 of this utility model, the reflective surface of the structured light reflecting cone 41 is a conical surface, preferably a straight conical surface with a half-cone angle of 45 degrees. The reflective surface of the main reflecting cone 31 is any one of a parabolic surface of revolution, a hyperbolic surface of revolution, or a straight conical surface of revolution. The reflective surface of the structured light reflecting cone 41 can also be a straight conical surface with other angles, and this utility model is not limited thereto.

[0121] In one embodiment of the internal hole measuring device 10 of this utility model, the collimating light generator is either a collimating laser or a collimating LED light source device.

[0122] Please refer to Figures 4 to 6 This is a cross-sectional schematic diagram of the inner hole measuring device 10 in the fourth to sixth embodiments of this utility model. Figure 5 and Figure 6 The calculation control unit 50, workpiece 60, and structured light ring 70 are omitted. The fourth to sixth embodiments and the first to third embodiments have the same arrangement of the photoelectric transmitter and photoelectric receiver, with the following differences:

[0123] In one embodiment of the internal hole measuring device 10 of this utility model, the housing 20 further includes a first housing 20a and a second housing 20b, and the light-transmitting cover 22 includes a first light-transmitting cover 22a and a second light-transmitting cover 22b; the first housing 20a includes a camera support 21 and a first light-transmitting cover 22a, and a camera 32 and an image sensor 33 are disposed in a second chamber 24b formed by the camera support 21, the first light-transmitting cover 22a and the main reflector cone 31. The camera support 21, the first light-transmitting cover 22a, the main reflector cone 31, the photoelectric emitter 44, the camera 32 and the image sensor 33 are all present. The sensor 33 together constitutes the first connector 25a; the second housing 20b includes a collimating light generator support 23 and a second light-transmitting cover 22b, and a collimating light generator 42 is disposed in a third chamber 24c formed by the collimating light generator support 23, the second light-transmitting cover 22b and the structured light reflecting cone 41; the collimating light generator support 23, the second light-transmitting cover 22b, the structured light reflecting cone 41, the photodetector 45 and the collimating light generator 42 together constitute the second connector 25b; the first connector 25a and the second connector 25b are connected by a detachable or fixed method.

[0124] In one embodiment of the internal hole measuring device 10 of this utility model, the housing 20 further includes a first housing 20a and a second housing 20b, and the light-transmitting cover 22 includes a first light-transmitting cover 22a and a second light-transmitting cover 22b; the first housing 20a includes a camera support 21, a photoelectric emitter support 26 and a first light-transmitting cover 22a, and a camera 32 and an image sensor 33 are disposed in a second chamber 24b formed by the camera support 21, the first light-transmitting cover 22a and the main reflector cone 31. The camera support 21, the first light-transmitting cover 22a, the main reflector cone 31, the photoelectric emitter 44, the photoelectric emitter support 26, the camera 32 and the image sensor 33 are all present in the second chamber 24b formed by the ... The sensor 33 together constitutes the first connector 25a; the second housing 20b includes a collimating light generator support 23, a photodetector support 27, and a second light-transmitting cover 22b. The collimating light generator 42 is disposed in the third chamber 24c formed by the collimating light generator support 23, the second light-transmitting cover 22b, and the structured light reflecting cone 41. The collimating light generator support 23, the second light-transmitting cover 22b, the structured light reflecting cone 41, the photodetector 45, the photodetector support 27, and the collimating light generator 42 together constitute the second connector 25b. The first connector 25a and the second connector 25b are connected by a detachable or fixed method.

[0125] In one embodiment of the internal hole measuring device 10 of this utility model, the first connecting body 25a and the second connecting body 25b are connected by a detachable or fixed manner, further comprising:

[0126] The main reflector cone 31 of the first connector 25a and the structured light reflector cone 41 of the second connector 25b or

[0127] The primary reflector cone 31 of the first connector 25a and the collimating light generator support 23 of the second connector 25b or

[0128] The main reflective cone 31 of the first connector 25a and the structured light connector 46 of the second connector 25b are connected by a detachable method, a fixed method, or an integrated method.

[0129] The structured light connector and the second light-transmitting cover are connected to the structured light reflecting cone.

[0130] Those skilled in the art should know that the first connector 25a and the second connector 25b are connected in a detachable manner, including direct connection of the components that are in contact with each other when the first connector 25a and the second connector 25b are abutted together, and indirect connection between them through connector components.

[0131] In one embodiment of the internal hole measuring device 10 of this utility model, one or more range shims 80 are further included between the first connecting body 25a and the second connecting body 25b, which are used to change the range of measuring the internal hole of the workpiece 60 by changing the distance Hd between the main reflecting cone 31 and the structured light reflecting cone 41. The main reflecting cone 31, the range shim 80 and the structured light reflecting cone 41 or the main reflecting cone 31, the range shim 80 and the collimating light generator support 23 are fixedly connected by a detachable method such as magnet, thread, elastic deformation or buckle.

[0132] Please see Figure 7 , Figure 7 This is a cross-sectional schematic diagram of the internal hole measuring device according to the seventh embodiment of this utility model. This embodiment is similar to... Figure 4 The difference in the illustrated embodiment is that the range shim 80 is omitted in this embodiment, and the main reflection cone 31 and the structured light reflection cone 41 are integrated into one structure.

[0133] Different distances Ha between the camera 32 and the plane of the structured light ring 70 correspond to different measuring ranges of the inner hole measuring device 10.

[0134] In one embodiment of the internal hole measuring device of the present invention, the wavelength range of the control light emitted by the photoelectric emitter 44 does not overlap with the wavelength range of the camera, and the wavelength range of the light emitted by the collimating light generator 42 is within the wavelength range of the camera.

[0135] In one embodiment of the internal hole measuring device of the present invention, the control light emitted by the photoelectric emitter 44 is infrared light.

[0136] Please see Figure 8 , Figure 8This is a cross-sectional schematic diagram of the internal hole measuring device according to the eighth embodiment of this utility model.

[0137] In one embodiment of the internal hole measuring device 10 of the present invention, the structured light reflecting cone 41 and the collimating light generator 42 are an integrated structure.

[0138] Specifically, when the structured light reflection cone 41 and the collimating light generator 42 are integrated, the structured light reflection cone 41 may further include a structured light connector 46. It should be noted that... Figure 8 The structure is illustrated using an example. This structure can also be used in various embodiments of this utility model. Some of these embodiments are illustrated below.

[0139] In one embodiment including the range pad 80, the structured light connector 46 is connected to the second light-transmitting cover 22b and the structured light reflecting cone 41, such that the structured light reflecting cone 41 is connected to the range pad 80 through the structured light connector 46, wherein the structured light connector 46 and the range pad 80 are detachably connected by a magnet, thread, elastic deformation or latch.

[0140] In one embodiment where the light-transmitting cover 22 includes a first light-transmitting cover 22a and a second light-transmitting cover 22b and no range shim 80 is provided, the structured light connector 46 is connected to the second light-transmitting cover 22b and the structured light reflecting cone 41, such that the structured light reflecting cone 41 is connected to the main reflecting cone 31 through the structured light connector 46, wherein the structured light connector 46 and the main reflecting cone 31 are connected in a detachable manner. The second housing 20b includes a collimating light generator support 23 and a second light-transmitting cover 22b. A structured light reflecting cone 41 and a collimating light generator 42 are disposed in a third chamber 24c formed by the collimating light generator support 23, the second light-transmitting cover 22b, and the structured light connector 46. The collimating light generator support 23, the second light-transmitting cover 22b, the structured light connector 46, the structured light reflecting cone 41, and the collimating light generator 42 together constitute a second connector 25b. The first connector 25a and the second connector 25b are detachably connected to the structured light connector 46 via the main reflecting cone 31.

[0141] In one embodiment where the light-transmitting cover 22 is a single unit, a structured light connector 46 may be optionally provided, which is connected to the structured light reflecting cone 41, such that the structured light reflecting cone 41 is connected to the main reflecting cone 31 through the structured light connector 46, wherein the structured light connector 46 and the main reflecting cone 31 are connected in a detachable manner.

[0142] The aforementioned detachable connection methods include magnets, threads, elastic deformation, or latches. Fixed connection methods include bonding, welding, and interference fit. Integrated connection methods involve multiple functional parts being supported by a single physical part, and are also manufactured as a single unit.

[0143] Alternatively, the structured light connector 46 can also be integrated with the structured light reflector cone 41.

[0144] Please see Figure 9 , Figure 9 This is a cross-sectional schematic diagram of an internal hole measuring device according to another embodiment of the present invention.

[0145] Figure 9 The illustrated embodiments and Figure 8 The difference in the illustrated embodiment is that, Figure 9 In the embodiment, the collimating light generator 42 and the structured light reflecting cone 41 in the structured light generator assembly 40 are arranged in the following order: Figure 8 The opposite is true in the embodiments. Figure 9 The advantage of this setup is that the structured light reflection cone 41 reflects the collimated beam emitted by the collimating light generator 42, forming a structured light ring 70 on the surface 60a of the workpiece's inner hole at the measurement location. The distance Ha between the camera 32 and the plane of the structured light ring 70 is greater than that between the two locations. Figure 8 In the Chinese embodiment, the distance Ha is larger, which allows for the measurement of inner holes with larger diameters.

[0146] Please see Figure 10 , Figure 10 This is a cross-sectional schematic diagram of the internal hole measuring device according to the tenth embodiment of this utility model.

[0147] In one embodiment of the internal hole measuring device 10 of the present invention, the effective light path portion of the first light-transmitting cover 22a is a rotating body with equal wall thickness. The light scattered by the structured light ring 70 passes through the first light-transmitting cover 22a and is reflected by the main reflective cone 31 into the camera 32. The portion of the light path entering the camera 32 that covers the first light-transmitting cover 22a is the effective light path portion.

[0148] In this embodiment, with Figure 7 The difference in the embodiment shown is that the effective light path portion of the first light-transmitting cover 22a is a conical rotating body with equal wall thickness.

[0149] The working principle of the aforementioned internal bore measuring device 10 will be described below. Please refer to [link / reference]. Figure 11 , Figure 11 This is a schematic block diagram of the operation of the calculation and control unit 50 of the internal hole measuring device 10 according to an embodiment of the present invention.

[0150] The calculation and control unit 50 includes: a central control module 51, an interactive processing module 52, a structured light control module 53, an image processing module 54, a halo extraction module 55, a physical coordinate reconstruction module 56, and a geometric quantity calculation module 57.

[0151] The main control module 51 of the calculation control unit 50 interacts with the interaction processing module 52 to handle human-computer interaction and interaction with the host computer. The main control module 51 also interacts with the structured light control module 53 to control the aligned light generator 42. The main control module 51 interacts with the structured light control module 53, the image processing module 54, the halo extraction module 55, the physical coordinate reconstruction module 56, and the geometric quantity calculation module 57 to perform internal hole measurement calculations.

[0152] For the calculation part of the internal hole measurement, the collimated beam emitted by the collimating light generator 42 is reflected by the structured light reflecting cone 41 to form a planar structured light perpendicular to the probe axis A, which illuminates the inner hole surface 60a of the workpiece to form a structured light ring 70. The image processing part mainly includes processing the image of the structured light ring 70 after it is reflected by the surface of the main reflecting cone 31 and enters the image sensor 33 of the camera 32 to obtain the image signal. Then, machine vision technology is used to extract the ring 70, extract the ring spot of the image signal, and then calculate the internal hole cross-sectional coordinates through physical coordinate reconstruction, thereby calculating geometric quantities such as the internal hole diameter and contour deviation.

[0153] Please refer to Figure 12 , Figure 12 This is a schematic diagram illustrating the calculation principle of physical coordinate reconstruction for an internal hole measuring device 10 according to an embodiment of the present invention.

[0154] Regarding the calculation principle of physical coordinate reconstruction, y=f(x) is the equation of the axial section curve of the main reflection cone 31, P1 is the point on the axial section of the structured light ring 70 on the inner hole surface 60a of the workpiece, and P2 and P3 are the images of P1 on the surface of the main reflection cone 31 and the image sensor 33 of the camera 32, respectively. A rectangular coordinate system is established with the intersection of the endpoint of the main reflection cone 31 near the camera 32 on the housing 20 and the axis A as the origin O. The pixel coordinate height at P3 is h, the inner hole radius at P1 is r, the distance between the camera lens and the origin O on the x-axis is L, the distance between the camera lens and the ring 70 on the x-axis is H, and the distance between the camera lens and the image sensor 33 on the x-axis is f. After image processing and extraction of the ring 70, the main process of physical coordinate reconstruction and geometric calculation is as follows:

[0155] Given the known pixel coordinates and height h at point P3, the coordinates of point P2 (x2, y2) can be calculated.

[0156] Calculate the slope of the tangent at P2, f'(x2), then the slope of the normal is -1 / f'(x2). According to the law of light reflection, the slope of the line from P2 to P1 can be obtained, and then its equation can be obtained.

[0157] Calculate the coordinates of point P1, P1(x1,y1);

[0158] The radius at point P1 is r=y1, which gives the functional relationship r=g(h);

[0159] The inner hole radius and diameter are calculated for multiple points on the ring 70 according to the above process;

[0160] Calculate geometric quantities such as the deviation of the inner hole profile.

[0161] Profile deviation refers to the deviation between the actual profile and the theoretical profile, mainly the shape deviation of the cross section, such as roundness and line profile.

[0162] In one embodiment of this utility model, the calculation is explained using the main reflective cone as a rotating linear conical surface and the measurement of the axial section of the inner hole of a circular workpiece as an example. The inclination angle θ of the generatrix of the main reflective cone 31, the pixel coordinate height h at P3, the distance f between the camera lens and the image sensor 33 on the x-axis (camera focal length), and H and L are known information. OP2 is the generatrix of the cone.

[0163] The physical coordinate reconstruction process is as follows:

[0164] The equation of the generatrix of the main reflecting cone 31 is: y = tanθ*x (1)

[0165] The equation of line P3P2 is: y = h / f*(x + L) (2)

[0166] Solving equations (1) and (2) simultaneously, we can find the coordinates (x2, y2) of the intersection point P2:

[0167] x2=h*L / (f*tanθ-h) (3a)

[0168] y2=h*L / (f*tanθ-h)*tanθ (3b)

[0169] According to the law of reflection, α = θ - φ, therefore the slope of the line P2P1 is tan(2θ - φ), and its equation is:

[0170] y=tan(2θ-φ)*x+y2-tan(2θ-φ)*x2 (4)

[0171] in:

[0172] φ=arctan(h / f) (5)

[0173] Therefore, the physical coordinates of P1(x1,y1) can be obtained as follows:

[0174] x1=HL (6a)

[0175] y1=tan(2θ-φ)*(HL)+y2-tan(2θ-φ)*x2 (6b)

[0176] r=y1 is the radius of the inner hole at point P1.

[0177] Using the above method, the physical coordinates {Pi(xi, yi)} of multiple discrete points on the structured light ring 70 can be calculated.

[0178] Geometric quantity calculation:

[0179] By fitting the discrete point set {Pi}, an approximate ideal circle is obtained, and the radius of the ideal circle is the measurement radius. Further calculation of the deviation distance of each Pi from the ideal circle yields the roundness error.

[0180] The internal hole measuring device provided by this invention features a simple and compact probe structure, making it portable and particularly suitable for measuring deep holes and pipes. It can simultaneously measure the geometric quantities of each measuring point on the structured light ring section of the workpiece, resulting in high measurement efficiency. When combined with axial CNC displacement control, the internal hole measuring device provided by this invention can easily complete three-dimensional digital scanning sampling of the inner surface of hole-like cavities.

[0181] In summary, this utility model may have many other embodiments. Without departing from the spirit and essence of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model. However, these corresponding changes and modifications should all fall within the protection scope of the patent application filed by this utility model.

Claims

1. An internal hole measuring device, characterized in that, It includes a computing control unit, a housing, and an optical imaging assembly and a structured light generator assembly coaxially disposed within the housing, wherein, The optical imaging components include a primary reflector cone, a camera, and an image sensor within the camera; The structured light generator assembly includes a structured light reflector cone, a collimating light generator, a photoelectric emitter, and a photoelectric receiver; The structured light reflecting cone is used to reflect the collimated light beam emitted by the collimating light generator to form a structured light ring at the measurement location on the inner surface of the workpiece. The main reflecting cone is used to reflect the light scattered from the structured light ring onto the main reflecting cone. The camera and image sensor are used to receive the structured light ring reflected by the main reflecting cone to obtain image signals. The photoelectric transmitter is disposed on one of the upper and lower sides of the camera, and the photoelectric receiver is disposed on one of the upper and lower sides of the collimating light generator, with the photoelectric transmitter and the photoelectric receiver located on the same side of the camera and the collimating light generator and facing each other. The photodetector is connected to the collimating light generator; The calculation and control unit is connected to the camera and the photoelectric transmitter, and is used to calculate the relevant geometric quantities of the workpiece inner hole diameter and contour deviation based on the image signal.

2. The internal bore measuring device as described in claim 1, characterized in that, The camera, main reflector cone, structured light reflector cone, and collimating light generator are arranged sequentially from one side of the axis to the opposite side, or the camera, main reflector cone, collimating light generator, and structured light reflector cone are arranged sequentially from one side of the axis to the opposite side.

3. The internal bore measuring device as described in claim 2, characterized in that, The housing further includes a camera support, a light-transmitting cover, and a collimating light generator support. The camera support is used to support and fix the camera, and the collimating light generator support is used to support and fix the collimating light generator. The light-transmitting cover is fixed to the camera support and the collimating light generator support, and together with the camera support and the collimating light generator support, forms a first chamber for accommodating the camera, the image sensor, the collimating light generator, and the interconnected main reflector cone and the structured light reflector cone.

4. The internal bore measuring device as described in claim 3, characterized in that, The photoelectric transmitter and the photoelectric receiver, located opposite each other on the same side of the camera and the collimating light generator, further include: The photoelectric transmitter is disposed between the camera support and the light-transmitting cover, with the center of the photoelectric transmitter located between the extended surfaces of the inner and outer walls of the light-transmitting cover. The photoelectric receiver is disposed between the collimating light generator support and the light-transmitting cover, with the center of the photoelectric transmitter located between the extended surfaces of the inner and outer walls of the light-transmitting cover. The control light emitted by the photoelectric transmitter is transmitted through the inside of the light-transmitting cover and then received by the photoelectric receiver.

5. The internal bore measuring device as described in claim 3, characterized in that, The photoelectric transmitter and the photoelectric receiver, located opposite each other on the same side of the camera and the collimating light generator, further include: The photoelectric transmitter is disposed in the camera support body, and the photoelectric receiver is disposed in the collimating light generator support body. The control light emitted by the photoelectric transmitter is received by the photoelectric receiver after diffuse reflection through the inner hole of the workpiece.

6. The internal bore measuring device as described in claim 3, characterized in that, The photoelectric transmitter and the photoelectric receiver, located opposite each other on the same side of the camera and the collimating light generator, further include: The housing also includes a photoelectric transmitter support and a photoelectric receiver support. The photoelectric transmitter support is fixed to the outside of the camera support and is used to fix and support the photoelectric transmitter inside. The photoelectric receiver support is fixed to the outside of the collimating light generator support and is used to fix and support the photoelectric receiver inside. The control light emitted by the photoelectric transmitter is directly received by the photoelectric receiver without being blocked or reflected.

7. The internal bore measuring device as described in claim 3, characterized in that, It also includes a structured light controller and a battery disposed inside the collimating light generator support, wherein the structured light controller is connected to the collimating light generator, the photodetector and the battery, and the battery is used to power the collimating light generator, the structured light controller and the photodetector.

8. The internal bore measuring device as described in claim 1, characterized in that, The collimating light generator can be either a collimating laser or a collimating LED light source device.

9. The internal hole measuring device as described in claim 8, characterized in that, The reflective surface of the structured light reflecting cone is a conical surface, which is a straight conical surface with a half-cone angle of 45 degrees. The reflective surface of the main reflecting cone is any one of a parabolic surface, a hyperbolic surface, or a straight conical surface.

10. The internal bore measuring device according to any one of claims 3 to 7, characterized in that, The housing further includes a first housing and a second housing, and the light-transmitting cover includes a first light-transmitting cover and a second light-transmitting cover; the first housing includes the camera support and the first light-transmitting cover, and the camera and image sensor are disposed in a second chamber formed by the camera support, the first light-transmitting cover, and the main reflector cone; the camera support, the first light-transmitting cover, the main reflector cone, the photoelectric emitter, the camera, and the image sensor together constitute a first connecting body; the second housing includes the collimating light generator support and the second light-transmitting cover, and the collimating light generator is disposed in a third chamber formed by the collimating light generator support, the second light-transmitting cover, and the structured light reflector cone; the collimating light generator support, the second light-transmitting cover, the photoelectric receiver, the structured light reflector cone, and the collimating light generator together constitute a second connecting body; the first connecting body and the second connecting body are connected by a detachable or fixed method.

11. The internal bore measuring device as described in claim 10, characterized in that, The first housing further includes a photoelectric emitter support, in which the camera and image sensor are disposed in a second chamber formed by the camera support, the photoelectric emitter support, the first light-transmitting cover, and the main reflector cone. The camera support, the first light-transmitting cover, the main reflector cone, the photoelectric emitter, the photoelectric emitter support, the camera, and the image sensor together constitute a first connecting body. The second housing further includes a photoelectric receiver support, in which a collimating light generator is disposed in a third chamber formed by the collimating light generator support, the photoelectric receiver support, the second light-transmitting cover, and the structured light reflector cone. The collimating light generator support, the second light-transmitting cover, the photoelectric receiver, the photoelectric receiver support, the structured light reflector cone, and the collimating light generator together constitute a second connecting body.

12. The internal bore measuring device as described in claim 11, characterized in that, The first connector and the second connector are connected by a detachable or fixed method, further comprising: The primary reflector cone of the first connector and the structured light reflector cone of the second connector, or The primary reflector cone of the first connector and the collimating light generator support of the second connector or The main reflective cone of the first connector and the structured light connector of the second connector are connected by a detachable method, a fixed method, or an integrated method. The structured light connector and the second light-transmitting cover are connected to the structured light reflecting cone.

13. The internal bore measuring device as described in claim 12, characterized in that, A measuring shim is also included between the first and second connectors to change the measuring range for measuring the inner hole of the workpiece. The main reflector cone, the range shim, and the structured light reflector cone are located or The main reflector cone, the range shim, and the collimating light generator support are located or The main reflector cone, the range pad, and the structured light connector are connected in a detachable manner.

14. The internal bore measuring device according to any one of claims 1, 4, 5, and 6, characterized in that, The wavelength range of the control light emitted by the photoelectric emitter does not overlap with the wavelength range of the camera's light-sensing sensor, while the wavelength range of the light emitted by the collimating light generator is within the wavelength range of the camera's light-sensing sensor.

15. The internal bore measuring device as described in claim 14, characterized in that, The control light emitted by the photoelectric transmitter is infrared.

16. The internal bore measuring device according to any one of claims 11-12, characterized in that, The detachable connection includes a fixed connection by means of magnets, threads, elastic deformation or locking, and the fixed connection includes a connection by means of bonding, welding or interference fit.

17. The internal bore measuring device according to any one of claims 11-13, characterized in that, The effective light path portion of the first light-transmitting cover is a rotating body with equal wall thickness. The light scattered by the structured light ring passes through the first light-transmitting cover and is reflected by the main reflective cone into the camera. The portion of the light path entering the camera that covers the first light-transmitting cover is the effective light path portion.

18. The internal bore measuring device according to any one of claims 1-9, 11-13 and 15, characterized in that, The structured light reflection cone and collimating light generator are integrated into one unit.

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