Non-destructive Testing Device for Polyethylene Pipe Fittings Based on Compton Backscattering

Abstract

In the nondestructive testing device of the present invention, the radiation source and the detector are fixed to the moving unit of the testing device and can be driven by the moving unit of the testing device to move linearly up and down. The distance between the radiation source and the detector is adjustable in the up and down direction. The axial moving unit can drive the workpiece to move linearly in a direction parallel to the rotation axis of the workpiece, and the rotational moving unit can drive the workpiece to rotate around the rotation axis of the workpiece. The nondestructive testing device of the present invention has low cost, simple structure, convenient operation, and is suitable for long straight tubular workpieces.

Description

Technical Field

[0001] The present invention relates to the field of nondestructive testing devices, and particularly to a nondestructive testing device for polyethylene pipe fittings based on Compton backscattering. Background Art

[0002] Nondestructive testing refers to a method of using changes in heat, sound, light, electricity, magnetism, etc. caused by abnormalities or defects in the internal structure of materials without damaging or affecting the service performance of the object to be detected and without harming the internal tissues of the object to be detected. By means of physical or chemical methods, with the help of modern technologies and equipment, the structure, properties, state, and the type, nature, quantity, shape, position, size, distribution, and their changes of defects inside and on the surface of the test piece are inspected and tested.

[0003] Nondestructive testing is an essential and effective tool for industrial development, mainly including radiographic testing (RT), ultrasonic testing (UT), magnetic particle testing (MT), liquid penetrant testing (PT), eddy current testing (ECT), acoustic emission testing (AE), thermography / infrared (TIR), leak testing (LT), alternating current field measurement technology (ACFMT), magnetic flux leakage testing (MFL), remote field testing (RFT), time-of-flight diffraction ultrasonic testing (TOFD), and many other methods. Among them, radiology, as one of the five conventional nondestructive testing methods, has a very wide application in industry.

[0004] Conventional nondestructive testing devices based on radiology usually adopt transmission imaging technology or Compton backscattering imaging technology, both of which have many problems such as high cost, complex structure, inconvenient operation, and inapplicability to long straight tubular workpieces. Therefore, it is necessary to develop a nondestructive testing device with low cost, simple structure, convenient operation, and applicable to long straight tubular workpieces. Summary of the Invention

[0005] The purpose of the present invention is to provide a nondestructive testing device with low cost, simple structure, convenient operation, and applicable to long straight tubular workpieces, so as to solve the aforementioned problems in the prior art. For this purpose, the technical solutions provided by the present invention are as follows.

[0006] In one embodiment, a non-destructive testing device is described, which is characterized by including a frame, a radiation source, a detector, a workpiece table, and a testing device motion unit. The radiation source and the detector are fixed to the testing device motion unit and can be driven by the testing device motion unit to move linearly up and down. The distance between the radiation source and the detector is adjustable in the up-and-down direction. The testing device motion unit is fixed to the frame. The workpiece table includes an axial motion unit and a rotational motion unit. The axial motion unit can drive the workpiece to move linearly in a direction parallel to the rotation axis of the workpiece, and the rotational motion unit can drive the workpiece to rotate around the rotation axis of the workpiece. The radiation source and the detector are fixed in the horizontal direction.

[0007] In one implementation, the axial motion unit drives the workpiece to move axially through the rolling of axial movement rollers. The rotation axis of the axial movement rollers is perpendicular to the rotation axis of the workpiece, and the rotation plane of the axial movement rollers is parallel to the rotation axis of the workpiece.

[0008] In one implementation, the rotational motion unit drives the workpiece to rotate a certain angle through the rolling of angular rotation rollers. The rotation axis of the angular rotation rollers is parallel to the rotation axis of the workpiece, and the rotation plane of the angular rotation rollers is perpendicular to the rotation axis of the workpiece.

[0009] In one implementation, the number of the axial movement rollers is not less than 2. An arc-shaped groove is provided on the acting surface of the axial movement rollers. The axial movement rollers are arranged in a single row or in two or more rows side by side. When arranged in two or more rows side by side, the axial movement rollers are arranged radially along the rotation plane where the geometric centers of the axial movement rollers are located; or, the number of the axial movement rollers is not less than 2, and only one axial movement roller driving motor is provided. The axial movement roller driving motor drives all the axial movement rollers to rotate through an axial movement transmission mechanism.

[0010] In one implementation, the angular rotation rollers are arranged in two or more rows side by side and parallel. The number of angular rotation rollers in each row is not less than 2, and the outer circles of the angular rotation rollers are tangent to the outer circle of the workpiece; or, the number of the angular rotation rollers is not less than 2, and only one angular rotation roller driving motor is provided. The angular rotation roller driving motor drives all the angular rotation rollers to rotate through an angular rotation transmission mechanism.

[0011] In one implementation, the rotational motion unit drives the workpiece to rotate a certain angle through the rolling of angular rotation rollers. The rotation axis of the angular rotation rollers is parallel to the rotation axis of the workpiece, and the rotation plane of the angular rotation rollers is perpendicular to the rotation axis of the workpiece. The angular rotation rollers are arranged in two or more rows side by side and parallel. The number of angular rotation rollers in each row is not less than 2, and the outer circles of the angular rotation rollers are tangent to the outer circle of the workpiece. The angular rotation rollers and the axial movement rollers are distributed at intervals in a crosswise manner.

[0012] In one embodiment, the workpiece inlet end of the workpiece table is provided with the axial movement rollers but not the angular rotation rollers, or one or more angular rotation rollers can be omitted between two adjacent axial movement rollers.

[0013] In one embodiment, among the ray source and the detector, the one with the smaller outer contour size extends into the inner cavity of the workpiece, and the one with the larger outer contour size is located outside the workpiece.

[0014] In one embodiment, the ray source is fixed to the moving component of the detection device motion unit through a ray source bracket, and the detector is fixed to the moving component of the detection device motion unit through a detector bracket; both the ray source bracket and the detector bracket are directly movably connected to the moving component of the detection device motion unit through an L-shaped fixing plate.

[0015] In another embodiment, a non-destructive testing device based on Compton backscattering is described, which is characterized by including a Compton backscattering detector and any one of the foregoing non-destructive testing devices. The Compton backscattering detector is located on the same side of the ray source and outside the workpiece, and the Compton backscattering detector is fixed to the Compton backscattering motion unit and adjusted in position or / and angle by the Compton backscattering motion unit.

[0016] The beneficial effects and other advantages of the present invention will become clear and understandable from the following detailed description in conjunction with the drawings. The drawings illustrate the principle of the present invention by way of examples. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The described embodiments will be easily understood from the following description in conjunction with the drawings. Similar reference numerals in the drawings represent similar structural elements. The following are the specific descriptions of each drawing.

[0018] Figure 1 It is a schematic diagram of the overall structure of the non-destructive testing device according to an embodiment of the present invention.

[0019] Figure 2 For Figure 1 An embodiment of the axial movement rollers of the non-destructive testing device.

[0020] Figure 3 For Figure 2 It is a schematic diagram of the connection relationship between the axial movement rollers and the workpiece.

[0021] Figure 4 For Figure 1 It is a schematic diagram of the connection relationship between the angular rotation rollers and the workpiece of the non-destructive testing device.

[0022] Figure 5 For Figure 1 It is a schematic diagram of a single-motor drive structure of the axial movement rollers of the non-destructive testing device, whereFigure 5 (a) is a schematic structural diagram in the front view direction, Figure 5 (b) is a schematic structural diagram in the top view direction.

[0023] Figure 6 It is Figure 1 a schematic structural diagram of a corner-rotating roller drive structure of the non-destructive testing device.

[0024] Figure 7 It is Figure 1 a schematic structural diagram of a single-motor drive structure of a corner-rotating roller of the non-destructive testing device.

[0025] Figure 8 It is Figure 1 a schematic structural diagram of a connection structure between a radiation source bracket and a detector bracket of the non-destructive testing device. Detailed implementation manners

[0026] In the following detailed description, a large number of specific details are set forth to provide a thorough understanding of the underlying principles of the described embodiments. However, it will be apparent to those skilled in the art that the described embodiments may be practiced without some or all of these specific details. During the description of the embodiments, well-known processing steps are not specifically described to avoid unnecessarily obscuring the fundamental principles.

[0027] The embodiments of the present invention will be described in detail below with the aid of the drawings. However, those skilled in the art should understand that the specific descriptions given herein with reference to these drawings are for illustrative purposes, and the present invention extends beyond these limited embodiments.

[0028] All azimuth terms or relative relationship terms such as left, right, up, down, front, back, middle, etc. involved in the present invention are only for convenience of description and do not have a limiting effect. Those skilled in the art can simply transform or adjust according to the azimuth terms or relative relationship terms, so as to obtain a new azimuth relationship or relative relationship without changing the essence of the invention or the technical means, and it should be equally regarded as the technical solution claimed by the present invention.

[0029] All technical terms involved in the present invention that have no specific or special explanations refer to the technical terms in the prior art documents that are the same or basically the same as their actual functions, meanings, or structures. The technical terms of the present invention should be regarded as the corresponding technical terms in the prior art.

[0030] Such as Figure 1As shown in the figure, the non-destructive testing device of an embodiment of the present invention includes a frame 10, a radiation source 20, a detector 30, a workpiece table 40, and a detection device motion unit 50. The radiation source 20 and the detector 30 are fixed to the detection device motion unit 50 and can be driven by the detection device motion unit 50 to move linearly up and down. The distance between the radiation source 20 and the detector 30 is adjustable in the up and down direction. The detection device motion unit 50 is fixed to the frame 10. The workpiece table 40 includes an axial motion unit 41 and a rotational motion unit 42. The axial motion unit 41 can drive the workpiece 80 to move linearly in a direction parallel to the rotation axis of the workpiece 80. The rotational motion unit 42 can drive the workpiece 80 to rotate around the rotation axis of the workpiece 80. The radiation source 20 and the detector 30 are fixed in the horizontal direction.

[0031] In the prior art, the radiation source 20 and the detector 30 are respectively driven by a motion unit to move linearly or rotationally. In the present invention, since the radiation source 20 and the detector 30 are both fixed to the detection device motion unit 50, a linear motion unit can be omitted. Since the radiation source 20 and the detector 30 are fixed in the horizontal direction, the linear motion unit for horizontal movement can also be omitted. Therefore, the cost can be greatly reduced, and the structure and operation can be simplified.

[0032] In the prior art, the axial motion unit 41 only drives the workpiece 80 to move up and down, and cannot drive the workpiece 80 to move linearly in a direction parallel to the rotation axis of the workpiece 80. Therefore, it is not suitable for long straight tubular workpieces.

[0033] In the present invention, since the axial motion unit 41 can drive the workpiece 80 to move linearly in a direction parallel to the rotation axis of the workpiece 80, it can be suitable for long straight tubular workpieces.

[0034] Figure 1 The radiation source 20 and the detector 30 shown can be interchanged, and the corresponding solutions are all within the protection scope of the present invention.

[0035] Preferably, among the radiation source 20 and the detector 30, the one with a smaller outer contour size extends into the inner cavity of the workpiece 80, and the one with a larger outer contour size is located outside the workpiece 80, so as to be applicable to workpieces 80 with a smaller inner diameter and improve the applicable range.

[0036] In one embodiment, the axial motion unit 41 directly drives the workpiece to move linearly along the axis of the workpiece 80 by using a single-axis linear motion unit (also known as a single-axis robot, single-axis linear motion module, linear module, linear motion unit, etc.) in the prior art.

[0037] In one embodiment, the rotational motion unit 42 drives the workpiece 80 to rotate by using a conventional rotary motor or a rotary motor module provided with a speed reducer.

[0038] In order to further save costs, simplify the system structure and operation complexity, and adapt to tubular workpieces with a larger axial length, in one embodiment, the axial movement unit 41 drives the workpiece 80 to move axially through the rolling of the shaft movement roller 41-1. The rotation axis of the shaft movement roller 41-1 is perpendicular to the rotation axis of the workpiece 80, and the rotation plane of the shaft movement roller 41-1 is parallel to the rotation axis of the workpiece 80. The rotational movement of the shaft movement roller 41-1 is converted into the rotational movement of the workpiece 80 through the frictional force between the shaft movement roller 41-1 and the workpiece 80.

[0039] In order to further save costs, simplify the system structure and operation complexity, and adapt to tubular workpieces with a larger axial length, in one embodiment, the rotational movement unit 42 drives the workpiece 80 to rotate a certain angle through the rolling of the angular rotation roller 42-1. The rotation axis of the angular rotation roller 42-1 is parallel to the rotation axis of the workpiece 80, and the rotation plane of the angular rotation roller 42-1 is perpendicular to the rotation axis of the workpiece 80. The rotational movement of the angular rotation roller 42-1 is converted into the rotational movement of the workpiece 80 through the frictional force between the angular rotation roller 42-1 and the workpiece 80.

[0040] In one embodiment, the shaft movement rollers 41-1 are arranged in a single row, and the number of the shaft movement rollers 41-1 is not less than 2.

[0041] As Figure 2 、 Figure 3 shown, preferably, an arc-shaped groove is provided on the acting surface of the shaft movement roller 41-1, that is, the curved surface where the shaft movement roller 41-1 contacts the workpiece 80, so as to increase the contact area between the shaft movement roller 41-1 and the workpiece 80 and prevent the workpiece 80 from slipping.

[0042] In one embodiment, the shaft movement rollers 41-1 are arranged in two or more rows side by side, and the number of shaft movement rollers in each row is not less than 2. The rotation plane where the geometric centers of the shaft movement rollers 41-1 are located is arranged along the radial direction of the workpiece 80, so as to increase the contact area between each shaft movement roller 41-1 and the workpiece 80 and prevent the workpiece 80 from slipping.

[0043] In one embodiment, as Figure 4 shown, the angular rotation rollers 42-1 are arranged in two or more rows side by side and parallel, and the number of angular rotation rollers in each row is not less than 2. The outer circles of the angular rotation rollers 42-1 are tangent to the outer circle of the workpiece 80.

[0044] In one embodiment, as Figure 1 shown, the angular rotation rollers 42-1 and the shaft movement rollers 41-1 are distributed at intervals in a cross pattern.

[0045] To further reduce costs, one or more angular rotation rollers 42-1 can be omitted between two adjacent shaft displacement rollers 41-1. To simplify the operation and facilitate the workpiece 80 to enter the workpiece table 40 first and then rotate the workpiece 80, the shaft displacement rollers 41-1 are provided at the workpiece 80 inlet end of the workpiece table 40, while the angular rotation rollers 42-1 are not provided.

[0046] In one embodiment, each of the shaft displacement rollers 41-1 is driven by a rotating motor or a rotating motor provided with a speed reducer to rotate the shaft displacement roller 41-1.

[0047] In one embodiment, as Figure 5 (a), Figure 5 (b) shows, to save costs and reduce the number of rotating motors, only one shaft displacement roller driving motor 41-2 is provided. The shaft displacement roller driving motor 41-2 drives each shaft displacement roller 41-1 to rotate through a shaft displacement transmission mechanism. The shaft displacement transmission mechanism can be a gear transmission mechanism, a chain transmission mechanism, a belt pulley transmission mechanism, etc.

[0048] In one embodiment, the shaft displacement transmission mechanism is a belt transmission mechanism. Each shaft displacement roller 41-1 in the same row is respectively provided with a shaft displacement roller connecting shaft 41-3 and a shaft displacement roller auxiliary wheel 41-4. The shaft displacement roller connecting shaft 41-3 is coaxially and fixedly connected to the shaft displacement roller 41-1 and the shaft displacement roller auxiliary wheel 41-4. Each shaft displacement roller auxiliary wheel 41-4 is aligned and can transmit power through a shaft displacement transmission mechanism follower 41-5 to drive other shaft displacement roller auxiliary wheels 41-4 to rotate by the shaft displacement roller auxiliary wheel 41-4 driven by the shaft displacement roller driving motor 41-2. The shaft displacement roller auxiliary wheel 41-4 is a belt pulley, and the shaft displacement transmission mechanism follower 41-5 is a belt or a timing belt.

[0049] In one embodiment, the shaft displacement transmission mechanism is a chain transmission mechanism. Each shaft displacement roller 41-1 in the same row is respectively provided with a shaft displacement roller connecting shaft 41-3 and a shaft displacement roller auxiliary wheel 41-4. The shaft displacement roller connecting shaft 41-3 is coaxially and fixedly connected to the shaft displacement roller 41-1 and the shaft displacement roller auxiliary wheel 41-4. Each shaft displacement roller auxiliary wheel 41-4 is aligned and can transmit power through a shaft displacement transmission mechanism follower 41-5 to drive other shaft displacement roller auxiliary wheels 41-4 to rotate by the shaft displacement roller auxiliary wheel 41-4 driven by the shaft displacement roller driving motor 41-2. The shaft displacement roller auxiliary wheel 41-4 is a sprocket, and the shaft displacement transmission mechanism follower 41-5 is a chain.

[0050] To further save costs, power is also transmitted between multiple rows of shaft displacement rollers 41-1 in any one of the ways such as a gear transmission mechanism, a chain transmission mechanism, a belt pulley transmission mechanism, etc., so as to realize that one shaft displacement roller driving motor 41-2 drives all the shaft displacement rollers 41-1 to rotate. Reference can be made toFigure 5 (a), Figure 5 (b), Figure 7 The specific implementation will not be elaborated further.

[0051] In one embodiment, each of the corner rotation rollers 42-1 is driven by a rotary motor or a rotary motor provided with a speed reducer to rotate the corner rotation roller 42-1.

[0052] In one embodiment, as Figure 6 shown, to save costs and reduce the number of rotary motors, the corner rotation rollers 42-1 in each row are coaxially fixed to a corner rotation roller connecting shaft 42-3, and the corner rotation roller connecting shaft 42-3 is driven to rotate by a corner rotation roller driving motor 42-2, thereby driving all the corner rotation rollers 42-1 to rotate.

[0053] To further save costs, as Figure 7 shown, power is transmitted between multiple rows of corner rotation rollers 42-1 by any one of a gear transmission mechanism, a chain transmission mechanism, a belt pulley transmission mechanism, etc., so as to realize that one corner rotation roller driving motor 42-2 drives all the corner rotation rollers 42-1 to rotate.

[0054] Exemplarily, one end of each of the corner rotation roller connecting shafts 42-3 is provided with a corner rotation roller auxiliary wheel 42-4, and a sprocket transmission structure or a belt pulley transmission structure as Figure 7 or Figure 5 shown is adopted for transmission movement between two or more corner rotation roller auxiliary wheels 42-4, and a corner rotation roller driving motor 42-2 is provided at the other end of one of the corner rotation roller connecting shafts 42-3.

[0055] In one embodiment, the radiation source 20 is fixed to the moving component of the detection device movement unit 50 through a radiation source bracket 60, and the detector 30 is fixed to the moving component of the detection device movement unit 50 through a detector bracket 70.

[0056] In one embodiment, both the radiation source bracket 60 and the detector bracket 70 are directly movably connected to the moving component of the detection device movement unit 50 through an L-shaped fixing plate. The direct movable connection can be realized by an annular hole groove structure, or can be realized by a straight groove structure, or can also be realized by arranging a linear guide rail.

[0057] In one embodiment, as Figure 8As shown, the ray source bracket 60 is directly movably connected to the moving assembly of the detection device moving unit 50 through the ray source connection plate 62, and the detector bracket 70 is directly movably connected to the moving assembly of the detection device moving unit 50 through the detector connection plate 72. One side of the ray source connection plate 62 connected to the moving assembly of the detection device moving unit 50 is provided with a through straight groove, which is arranged in the vertical direction. Bolts or studs can move vertically up and down under the guidance of the through straight groove. Fixed connection can be achieved by passing bolts or studs through the through straight groove and cooperating with several nuts. Loosening the nuts can adjust the position of the ray source bracket 60 in the vertical up and down direction, thereby realizing direct movable connection.

[0058] Similarly, the detector connection plate 72 can also be specifically implemented with the same structure as the ray source connection plate 62.

[0059] Compared with the prior art, the above direct movable connection structure is manually adjustable, and at least one linear motion unit can be saved, so the cost is further reduced and the structure is further simplified.

[0060] In the prior art, in order to improve the motion accuracy of the workpiece table, a precision linear motion unit or a rotary unit is generally used to directly drive the linear or rotary motion of the workpiece 80. Those skilled in the art believe that due to the inaccurate position information of the workpiece, if the motion accuracy of the workpiece table is not high, precise measurement cannot be achieved. The present invention adopts an axial displacement transmission mechanism and an angular rotation transmission mechanism, which will reduce the motion accuracy of the workpiece table. It is unexpectedly found that for inspection operations where defects cannot be repaired or subsequent processing is not required, there is no need to accurately determine the workpiece position information and the defect position information. It is only necessary to judge whether there are defects or abnormalities. Whether the workpiece position information is accurate does not affect the inspection result. Therefore, the accuracy of the workpiece table will not affect the ray imaging accuracy or the inspection accuracy. Therefore, a mechanical transmission mechanism with lower accuracy can be used to greatly save costs.

[0061] Another embodiment of the present invention, namely a non-destructive testing device based on Compton backscattering, includes a Compton backscattering detector and any one of the above non-destructive testing devices. The Compton backscattering detector is located on the same side as the radiation source 20 and outside the workpiece 80. The Compton backscattering detector is fixed to a Compton backscattering motion unit and is driven by the Compton backscattering motion unit to adjust its position and / or angle. In specific implementation, the technical solutions not described or not described in detail can refer to the specific implementations such as CN95240734.5, CN98247453.9, CN201711490186.3, CN201810156464.X, etc., or refer to mature commercial products such as the LBD101 type or ComScan450 type Compton backscattering imaging system (refer to Document 1 "Ding Houben, Li Hong. A Portable High-Resolution Compton Backscattering Scanner [J]. CT Theory and Applications Research, 1996, 5(3): 37-44" and Document 2 "J. Gerl. γ-Ray Applications [J]. Second Andean School on Nuclear Physics, Bogota, Colombia. October 2014. (http: / / www.gfnun.unal.edu.co / andeanschool / Lectures / JGerl / Gamma-II-JG.pdf)" respectively). The present invention will not be elaborated further.

[0062] The radiation source 20 can be any one of radiation sources such as an X-ray source, a γ-ray source, a neutron ray source or other radiation sources. The detector 30 is an imaging device compatible with the radiation source 20, and a standardized product in the prior art can be used. For example, when selecting the MXR160 / 11HP type X-ray tube of COMET company, the CareView 750I type product of CARERAY company can be selected.

[0063] To implement the non-destructive testing device of the present invention, other auxiliary components or auxiliary systems need to be set, such as a lead house, cooling water, a high-voltage generator, etc., and can be directly implemented by referring to the relevant products of YXLON company.

[0064] The basic functional module for linear motion or rotational motion is the basic unit for building Cartesian robots and various types of automated equipment. It is widely used in industries such as precision machining machinery, precision inspection machinery, automatic machining, automatic assembly, on-line inspection, dispensing, spraying, medical, pharmaceuticals, food, packaging, electronics, IC, etc. It is one of the essential means for industrial automation and intelligence. The specific implementation structure involves many components such as linear guides, transmission mechanisms, drive motors, sensors, drive controllers, moving worktables, bases, etc., which are not elaborated in this invention. Unless otherwise specified, any linear or rotational module or component group uses existing technologies.

[0065] The workpiece 80 is only for the convenience of description and is not an essential component of this invention. The automatic detection device without the workpiece 80 is still considered to fall within the protection scope of this invention.

[0066] By replacing the radiation source 20 or / and the detector 30, other types of detection devices or manufacturing devices can be obtained. The automatic devices thus obtained also have the above-mentioned essential technical solutions and main beneficial effects. Therefore, the detection device or the non-destructive detection device is not limited to the conventional literal meaning, but also includes all other types of detection devices or manufacturing devices obtained by replacing the radiation source 20 or / and the detector 30.

[0067] The structural components involved in the embodiments of this invention can usually be made of low-carbon steel, or can also be made of light metal materials such as aluminum alloy, aluminum-magnesium alloy, etc.

[0068] The fixed connection, fixed installation or fixation involved in the embodiments of this invention, unless otherwise specified, generally refers to any suitable or feasible method such as threaded connection, integrated structure designed and manufactured integrally, welding, riveting, hole-shaft fit connection, bonding, bundling connection, etc. The specific implementation manners or specific structures related to the bearings and bearing covers belong to existing technologies and common means, and are not described in detail, nor are drawings provided.

[0069] For the purchased parts or other existing technologies involved in the embodiments of this invention, during the specific implementation process of combining with the embodiments of this invention, some adaptations of parameters, structures, dimensions, programs, etc. may be involved. These adaptations can be directly obtained or specifically implemented by those skilled in the art, so they are not specifically described to avoid obscuring the fundamental principles and gist of this invention.

[0070] The content and specific implementation manners not detailed in the embodiments of this invention can be directly implemented by referring to existing technical documents and products sold or used publicly, or have been commonly used or widely known by those skilled in the art. Due to limitations such as cost, energy, laws and regulations, this invention only describes the main differences between the technical solutions of this invention and the existing technologies to avoid obscuring the fundamental principles and gist of this invention.

[0071] The above examples are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. Any equivalent transformation or modification made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

[0072] The above-described embodiments have elaborated on the technical solutions of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modification, supplement, or substitution in a similar manner made within the principle scope of the present invention should be included within the protection scope of the present invention.

Claims

1. A non-destructive testing device, characterized in that, it includes a frame, a radiation source, a detector, a workpiece table and a testing device movement unit. The radiation source and the detector are fixed to the testing device movement unit and can be driven by the testing device movement unit to move linearly up and down. The distance between the radiation source and the detector is adjustable in the up and down direction. The testing device movement unit is fixed to the frame. The workpiece table includes an axial movement unit and a rotational movement unit. The axial movement unit can drive the workpiece to move linearly in a direction parallel to the rotational axis of the workpiece, and the rotational movement unit can drive the workpiece to rotate around the rotational axis of the workpiece. The radiation source and the detector are fixed in the horizontal direction; among the radiation source and the detector, the one with the smaller outer contour size extends into the inner cavity of the workpiece, and the one with the larger outer contour size is located outside the workpiece; the radiation source is fixed to the moving component of the testing device movement unit through a radiation source bracket, and the detector is fixed to the moving component of the testing device movement unit through a detector bracket; both the radiation source bracket and the detector bracket are directly movably connected to the moving component of the testing device movement unit through an L-shaped fixing plate; the axial movement unit drives the workpiece to move axially through the rolling of axial movement rollers. The rotation axis of the axial movement rollers is perpendicular to the rotation axis of the workpiece, and the rotation plane of the axial movement rollers is parallel to the rotation axis of the workpiece; the rotational movement unit drives the workpiece to rotate a certain angle through the rolling of angular rotation rollers. The rotation axis of the angular rotation rollers is parallel to the rotation axis of the workpiece, and the rotation plane of the angular rotation rollers is perpendicular to the rotation axis of the workpiece; the number of axial movement rollers is not less than 2. An arc-shaped groove is provided on the acting surface of the axial movement rollers. The axial movement rollers are arranged in a single row or in two or more rows side by side. When arranged in two or more rows side by side, the axial movement rollers are arranged radially along the rotation plane where the geometric centers of the axial movement rollers are located. Only one axial movement roller drive motor is provided, and the axial movement roller drive motor drives all axial movement rollers to rotate through an axial movement transmission mechanism; the angular rotation rollers are arranged in two or more rows side by side and parallel. The number of angular rotation rollers in each row is not less than 2. The outer circles of the angular rotation rollers are tangent to the outer circle of the workpiece. Only one angular rotation roller drive motor is provided, and the angular rotation roller drive motor drives all angular rotation rollers to rotate through an angular rotation transmission mechanism; the angular rotation rollers and the axial movement rollers are distributed at intervals in a cross manner; power is transmitted between the angular rotation rollers through a transmission mechanism, so as to realize that one angular rotation roller drive motor drives all angular rotation rollers to rotate.

2. The non-destructive testing device according to claim 1, characterized in that, axial movement rollers are provided at the workpiece inlet end of the workpiece table and angular rotation rollers are not provided, or one or more angular rotation rollers can be omitted between two adjacent axial movement rollers.

3. A non-destructive testing device based on Compton backscattering, characterized in that, Comprising a Compton backscattering detector and a non-destructive testing device according to any one of claims 1-2, the Compton backscattering detector is located on the same side as the radiation source and outside the workpiece, and the Compton backscattering detector is fixed to a Compton backscattering motion unit and driven by the Compton backscattering motion unit to adjust its position and / or angle.

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