CN212159623U

CN212159623U - Workpiece table and nondestructive testing device

Info

Publication number: CN212159623U
Application number: CN201922385506.XU
Authority: CN
Inventors: 刘维玉; 王广; 黄彬彬; 汪晓岗; 马骥; 王艳玲
Original assignee: Ningbo Zhongwu Dongfang Optoelectronic Technology Co ltd; Shenzhen Hongguan Electromechanical Technology Co ltd; Ningbo Yuhua Electric Appliance Co ltd
Current assignee: Ningbo Yuhua Industrial Co ltd; Ningbo Zhongjiu Oriental Photoelectric Technology Co ltd; Shenzhen Hongguan Electromechanical Technology Co ltd
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2020-12-15
Anticipated expiration: 2029-12-26

Abstract

The utility model discloses an among workpiece table and nondestructive test device, the quantity that the chuck extends the piece is the same with the jack catch quantity of multi-jaw chuck, each the chuck extends piece fixed connection respectively in multi-jaw chuck's jack catch and can follow the radial rectilinear movement of multi-jaw chuck is followed to the jack catch. The utility model discloses a workpiece platform and nondestructive test device, with low costs, simple structure, simple operation, be applicable to various types and size pipe fitting.

Description

Workpiece table and nondestructive testing device

Technical Field

The utility model relates to a work piece platform and nondestructive test device, in particular to polyethylene pipe fitting nondestructive test device based on ray detection.

Background

The nondestructive testing is a method for inspecting and testing the structure, the property, the state and the type, the property, the quantity, the shape, the position, the size, the distribution and the change of the defects inside and on the surface of a test piece by taking a physical or chemical method as a means and by means of modern technology and equipment and by utilizing the change of the reaction of heat, sound, light, electricity, magnetism and the like caused by the abnormal structure or the existence of the defects of a material on the premise of not damaging or not influencing the service performance of the tested object and not damaging the internal tissue of the tested object.

Nondestructive testing is an essential effective tool for industrial development, and is mainly provided with a plurality of methods such as ray inspection (RT), ultrasonic inspection (UT), magnetic powder inspection (MT), liquid penetration inspection (PT), eddy current inspection (ECT), acoustic emission inspection (AE), thermography/infrared (TIR), Leakage Test (LT), Alternating Current Field Measurement Technology (ACFMT), magnetic flux leakage inspection (MFL), a far-field test detection method (RFT), an ultrasonic diffraction time difference method (TOFD) and the like. Among them, radiation detection (Radiology), one of five conventional nondestructive testing methods, is widely used in industry.

The conventional nondestructive testing device based on ray detection usually adopts a transmission type imaging technology, a common workpiece table cannot be suitable for various types and sizes of pipe fittings, the application range is limited, and one or more problems of high cost, complex structure, inconvenient operation and the like exist. Therefore, there is a need for a low-cost, simple structure, easy operation, and suitable for various types and sizes of pipe fittings.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a with low costs, simple structure, simple operation, be applicable to the workpiece table and the corresponding nondestructive test equipment of various types and size pipe fitting, solve the aforementioned problem among the prior art. Therefore, the technical scheme provided by the utility model is as follows.

In one embodiment, a workpiece table is described, which comprises a multi-jaw chuck, a chuck extension device and a chuck rotation driving unit, wherein the chuck rotation driving unit drives the multi-jaw chuck to rotate, the multi-jaw chuck comprises a chuck base and more than two jaws, the chuck extension device comprises a plurality of chuck extension blocks, the number of the chuck extension blocks is the same as that of the jaws of the multi-jaw chuck, and each chuck extension block is respectively and fixedly connected to the jaws of the multi-jaw chuck and can move linearly along the radial direction of the multi-jaw chuck along with the jaws.

In one embodiment, the chuck extension block is separable from the jaws.

In one embodiment, the chuck extends about the piece both ends and is the outside respectively and presss from both sides tight profile and jack catch cooperation profile, the chuck extend the piece the jack catch cooperation profile can with the corresponding and inseparable seamless or few seam laminating of jack catch outside profile, the outside presss from both sides tight profile and can closely laminate with work piece excircle or interior circle.

In one embodiment, the outer clamping profile of the chuck extension block is a stepped inner circle profile, so that the workpiece can be clamped in a reverse claw structure; or, the outside of chuck extension piece presss from both sides tight profile and is notch cuttype excircle profile, can realize that the positive claw structure presss from both sides tightly to the work piece.

In one embodiment, the chuck extension means further comprises one or more compression members engaging and compressing the respective chuck extension blocks in a direction parallel to the outer bottom surface of the multi-jaw chuck.

In one embodiment, the number of the jaws of the multi-jaw chuck is two, three, four, five, six or more, and each jaw is uniformly distributed along the circumferential direction of the multi-jaw chuck.

In one embodiment, the number of the jaws of the multi-jaw chuck is three, and the bulge of the workpiece is positioned between two adjacent jaws.

In another embodiment, a non-destructive inspection apparatus is described, comprising the multi-jaw chuck or/and chuck extension apparatus of any of the foregoing embodiments, and comprising a gantry and a radiation inspection module, the radiation inspection module comprising a radiation source.

In one embodiment, the method comprises the step of,

for a through pipe fitting, the multi-jaw chuck or the chuck extending device clamps one of two pipe orifices in a workpiece, and when a ray source or a flat panel detector can enter an inner cavity of the pipe fitting, the single-arm transillumination mode is adopted for imaging; when the ray source or the flat panel detector is inconvenient or can not enter the inner cavity of the pipe fitting, imaging is carried out in a double-arm transillumination mode;

for a T-shaped pipe fitting, the multi-jaw chuck or the chuck extending device clamps one of two opposite pipe orifices in a workpiece, and imaging is carried out in a double-arm transillumination mode;

for the reducing pipe fitting, the multi-jaw chuck or the chuck extending device clamps one of two pipe orifices in the workpiece, and when a ray source or a flat panel detector can enter the inner cavity of the pipe fitting, a single-arm transillumination mode is adopted for imaging; when the ray source or the flat panel detector is inconvenient or can not enter the inner cavity of the pipe fitting, imaging is carried out in a double-arm transillumination mode;

for L-shaped pipe fittings, the multi-jaw chuck or the chuck extending device clamps one of two pipe orifices in a workpiece and adopts a double-arm transillumination mode for imaging.

In one embodiment, the nondestructive testing apparatus further includes a compton backscatter detector located on the same side of the radiation source and outside the workpiece, and the compton backscatter detector is fixed to the compton backscatter motion unit and driven by the compton backscatter motion unit to adjust a position or/and an angle.

The benefits and other advantages of the present invention will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of the invention.

Drawings

The described embodiments will be readily understood by the following description in conjunction with the accompanying drawings, wherein like reference numerals designate like structural elements, and the following is a detailed description of the various drawings.

Fig. 1 is a schematic structural diagram of a multi-jaw chuck in the prior art, wherein fig. 1(a) is a schematic structural diagram of a front jaw structure clamping a workpiece, and fig. 1(b) is a schematic structural diagram of a reverse jaw structure clamping the workpiece.

FIG. 2 is a schematic three-dimensional view of one embodiment of the multi-jaw chuck of FIG. 1.

Fig. 3 is a schematic structural diagram of a conventional pipe fitting of a main common type, in which fig. 3(a) is a schematic structural diagram of a straight-through pipe fitting, fig. 3(b) is a schematic structural diagram of a T-shaped pipe fitting, fig. 3(c) is a schematic structural diagram of a reducing pipe fitting, and fig. 3(d) is a schematic structural diagram of an L-shaped pipe fitting.

Fig. 4 is a schematic structural diagram of an embodiment of the workpiece stage according to the present invention.

Fig. 5 is a schematic view of a position relationship between a protruding portion of a workpiece and a claw according to an embodiment of the present invention.

Fig. 6 is a schematic structural diagram of an embodiment of the nondestructive testing device of the present invention.

Fig. 7 is a schematic structural diagram of the nondestructive testing apparatus shown in fig. 6 when testing a straight-through pipe, wherein fig. 7(a) is a schematic structural diagram of single-arm transillumination, and fig. 7(b) is a schematic structural diagram of double-arm transillumination.

FIG. 8 is a schematic structural diagram of the nondestructive testing device in FIG. 6 for testing T-shaped pipe.

Fig. 9 is a schematic structural diagram of the nondestructive testing apparatus shown in fig. 6 when testing a reducing pipe, wherein fig. 9(a) is a schematic structural diagram of single-arm transillumination, and fig. 9(b) is a schematic structural diagram of double-arm transillumination.

FIG. 10 is a schematic structural diagram of the nondestructive testing device in FIG. 6 for testing L-shaped pipe.

Detailed Description

In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the underlying principles of the described embodiments. It will be apparent, however, to one skilled in the art, that the described embodiments may be practiced without some or all of these specific details. In describing embodiments, well known process steps have not been described in detail in order to avoid unnecessarily obscuring the underlying principles.

Embodiments of the invention are described in detail below with the aid of the figures. However, those skilled in the art will appreciate that the detailed description given herein with respect to these figures is for explanatory purposes as the invention extends beyond these limited embodiments.

The utility model relates to an all left and right, upper and lower, preceding, back, medium position word or relative relation word, only for the description convenience, do not have the limiting action, the field personnel can simply alternate or adjust according to position word or relative relation word to obtain not changing the new position relation or the relative relation of the essential content of invention or technical means, should regard as the utility model discloses the technical scheme who claims equally.

All technical terms related to the present invention, which are not specifically or specially explained, refer to technical terms in the prior art documents that are the same or substantially the same as the actual functions, meanings or structures thereof, and it should be noted that the technical terms of the present invention are the corresponding technical terms in the prior art.

As shown in fig. 1 and 2, a workpiece table of the related art generally uses a three-jaw self-centering chuck (a three-jaw chuck for short) to clamp a workpiece.

Conventional three-jaw chucks typically operate in two modes, a positive jaw configuration and a negative jaw configuration.

In the positive jaw structure, the jaws are inserted into the inner cavity of the workpiece and clamp the workpiece by the jaws along the radially outward acting force of the three-jaw chuck, as shown in fig. 1(a), a first clamping range corresponding to the inner wall with the smallest diameter of the jaws is a range of a size a (namely, a diameter a), a second clamping range corresponding to the first stepped table surface of the jaws is a range of a size a1 (namely, a diameter a 1), and more stepped table surfaces of the jaws, namely, a second stepped table surface, a third stepped table surface and the like correspond to more clamping ranges.

In the reverse jaw structure, a workpiece is inserted into a jaw cavity and clamped by the jaw along the inward radial force of the three-jaw chuck, as shown in fig. 1(B), a first clamping range corresponding to the inner wall with the smallest diameter of the jaw is a range of a size B (namely, a diameter B), a second clamping range corresponding to a first stepped platform of the jaw is a range of a size B1 (namely, a diameter B1), and more stepped platforms of the second jaw, the third jaw and the like correspond to more clamping ranges.

When prior art's work piece platform was by practical application in a certain automation equipment or detection device, if the work piece size surpassed this three-jaw chuck maximum clamping range greatly, then need operating personnel to change the three-jaw chuck of bigger specification, need loaded down with trivial details change dismantlement and assembly, consume manual work and time, need newly purchase the three-jaw chuck of bigger size specification simultaneously, purchase cycle length has additionally increased the purchase cost of bigger size specification three-jaw chuck. Moreover, the three-jaw chuck with larger size and specification needs to be matched with the chuck base with larger specification, and needs a driving motor and a transmission mechanism (such as a gear box, a worm gear transmission mechanism and the like) with larger specification, so that more purchasing cost is needed, more parts need to be replaced, if the hood space of an automatic device or a detection device is strictly limited, the three-jaw chuck and the chuck base cannot be replaced, the automatic device or the detection device cannot be suitable for workpieces with larger specification, and an automatic device or a detection device with larger applicable size needs to be additionally customized, obviously, the cost is too high, and the operation and the procedure are very complicated.

On the other hand, as shown in fig. 3, in the prior art, the pipe fittings required by various pipelines such as gas, oil, water and the like mainly include straight-through pipe fittings, T-shaped pipe fittings, reducing pipe fittings, L-shaped pipe fittings and the like, the pipe fittings often have a plurality of protrusions such as cable joints, observation holes, reinforcing ribs and the like, and conventional workpiece tables such as a rotary workpiece table for compressing a workpiece based on a T-shaped groove, a workpiece table for sucking a workpiece based on an electromagnetic chuck and the like can only be applied to detection or processing of one or two types of pipe fittings, but cannot be applied to all types of pipe fittings, or can be applied to all types of pipe fittings only by using a complex tool clamp. Three-jaw chucks or multi-jaw chucks are generally not used by those skilled in the art in view of the spatial interference of the projections and the robustness of the clamping, the suitability of complex profile pipe, etc. In particular, in nondestructive testing equipment for polyethylene pipes, a rotary workpiece table based on a T-shaped groove for compressing a workpiece or a workpiece table based on a compression circular hoop for hooping the workpiece is usually adopted, and obviously, the nondestructive testing equipment is only suitable for clamping straight pipes or reducing pipes and is not suitable for clamping T-shaped pipes or L-shaped pipes.

As shown in fig. 4, the workpiece-free platform of an embodiment of the present invention includes a multi-jaw chuck 10, a chuck extension device 20 and a chuck rotation driving unit 60, the chuck rotation driving unit 60 drives the multi-jaw chuck 10 to rotate, the multi-jaw chuck 10 includes a chuck base 12 and two or more jaws 11, the chuck extension device 20 includes a plurality of chuck extension blocks 21, the number of the chuck extension blocks 21 is the same as the number of the jaws 11 of the multi-jaw chuck 10, and each of the chuck extension blocks 21 is respectively fixedly connected to the jaws 11 of the multi-jaw chuck 10 and can move along the radial straight line of the jaws 11 along the multi-jaw chuck 10.

The chuck rotation driving unit 60 is directly implemented by a rotation motion unit (also called an electric turntable, a pneumatic turntable, a hydraulic turntable, an automatic turntable, etc.) in the prior art.

The multi-jaw chuck 10 further includes a chuck drive mechanism and a chuck transmission mechanism. The chuck driving mechanism can be driven by an electric motor, a hydraulic or pneumatic motor, or can be driven by manpower through a handle or a knob. The chuck transmission mechanism is directly driven by a gear set or a worm gear mechanism in the existing product.

The chuck driving mechanism and the chuck transmission mechanism are both fixed on the chuck base 12, and the rotating force of the chuck driving mechanism can drive the jaws 11 to move linearly along the radial inward direction or the outward direction of the multi-jaw chuck 10 through the transmission of the chuck transmission mechanism.

In one embodiment, the chuck extension block 21 is separable from the jaws 11, so that the chuck extension device 20 with different specifications can be replaced conveniently, and when the size of the workpiece changes greatly, only the chuck extension device 20 needs to be replaced, so that a great deal of cost can be saved, and the replacement operation is simple and convenient.

In one embodiment, as shown in fig. 4, the chuck extension block 21 can be closely attached to the outer profile of the jaw 11 without seams or seams, so as to increase the contact area between the chuck extension device 20 and the jaw 11, improve the fixing strength between the chuck extension device 20 and the jaw 11, further increase the applicable size range, and avoid the problem of poor clamping or easy shaking caused by the increase of the size of the workpiece.

The left end and the right end of the chuck extension block 21 are respectively an outer clamping contour 21-1 and a clamping jaw matching contour 21-2, and the outer clamping contour 21-1 can be tightly attached to the outer circle or the inner circle of the workpiece 80.

In one embodiment, as shown in fig. 4, the chuck extension device 20 further includes one or more pressing members 22, and the pressing members 22 are attached to and press against the chuck extension blocks 21 in a direction parallel to the outer bottom surface of the multi-jaw chuck 10, so as to further fix the chuck extension blocks 21, improve the clamping firmness of the workpiece with a larger size, and avoid the problems of loosening, shaking, twisting, etc.

In order to reduce or minimize the mass and moment of inertia of the pressing member 22, one way is to cut or perforate the pressing member 22 to eliminate most unnecessary structural materials, and the other way is to fix and press the respective chuck extending blocks 21 by a plurality of pressing members 22, and the pressing members 22 are fixedly connected as a whole.

In one embodiment, as shown in fig. 4, the outer profile 21-1 of the chuck extension block 21 is a stepped outer profile, so that the positive jaw structure can clamp a workpiece.

In another embodiment, the outer profile 21-1 of the chuck extension block 21 is a stepped inner circular profile, which can realize the clamping of a workpiece by a reverse jaw structure, and the specific profile shape refers to fig. 1 (6).

In one embodiment, the number of the jaws 11 of the multi-jaw chuck 10 is two, three, four, five, six or more, and each jaw 11 is uniformly distributed along the circumferential direction of the multi-jaw chuck 10.

In order to avoid the interference of the pipe protruding parts in the space to the utmost and to clamp the workpiece as firmly as possible, the number of the jaws 11 of the multi-jaw chuck 10 is preferably three, and the protruding parts 81 of the workpiece 80 are located in the empty spaces between two adjacent jaws 11, as shown in fig. 5.

As shown in fig. 7, another embodiment of the present invention is a nondestructive testing device, which includes the multi-jaw chuck 10 or/and the chuck extension device 20, and includes a frame 40 and a radiation detecting module 30.

The ray detection module 30 includes a ray source 35, a detector 31, a detector support 32, a detector linear motion unit 33, and the like. The frame 40 mainly comprises a protective lead chamber 41.

For a through pipe, the multi-jaw chuck 10 or the chuck extension device 20 clamps one of two pipe orifices in the workpiece 80, when the ray source 35 or the flat panel detector 31 can enter the inner cavity of the pipe, the nondestructive testing device adopts the single-arm transillumination mode shown in fig. 6(a) to carry out transmission type ray imaging; when the ray source 35 or the flat panel detector 31 is inconvenient or can not enter the inner cavity of the pipe fitting, the nondestructive testing device adopts a double-arm transillumination mode shown in fig. 6(b) to carry out transmission type ray imaging.

For a T-shaped pipe, as shown in fig. 8, the multi-jaw chuck 10 or the chuck extension device 20 clamps one of two opposite pipe orifices in the workpiece 80, and the nondestructive testing device performs transmission radiographic imaging in a double-arm transillumination mode.

For a reducing pipe fitting, the multi-jaw chuck 10 or the chuck extension device 20 clamps one of two pipe orifices in a workpiece 80, when the ray source 35 or the flat panel detector 31 can enter the inner cavity of the pipe fitting, the nondestructive testing device adopts a single-arm transillumination mode shown in fig. 9(a) to carry out transmission type ray imaging; when the ray source 35 or the flat panel detector 31 is inconvenient or can not enter the inner cavity of the pipe fitting, the nondestructive testing device adopts a double-arm transillumination mode shown in fig. 9(b) to carry out transmission type ray imaging.

For an L-shaped tubular, as shown in fig. 10, the multi-jaw chuck 10 or the chuck extension device 20 clamps one of two orifices in a workpiece 80, and the nondestructive inspection device performs transmission radiographic imaging in a two-arm transillumination mode.

In one embodiment, the source 35 and the detector 31 are driven by a motion unit to move linearly or rotationally. In another embodiment, source 35 and detector 31 share a single linear motion unit, and the relative position between source 35 and detector 31 is manually adjusted.

The utility model discloses a nondestructive test device of another embodiment, including compton backscatter detector and any kind of nondestructive test device of the aforesaid, compton backscatter detector is located ray source 35 is with one side and lie in the work piece 80 outside, compton backscatter detector is fixed in compton backscatter motion unit and drives and adjusting position or angle through compton backscatter motion unit. In specific implementation, reference may be made to specific implementations of CN95240734.5, CN98247453.9, CN201711490186.3, cn201810156464.x, etc., or to mature commercial products such as a compton backscattering imaging system of LBD101 type or ComScan450 type (see document 1 "butyl textbook, plum rainbow. an example portable high resolution compton backscattering scanner [ J ]. CT theory and application research, 1996, 5(3): 37-44" and document 2 "J. gerl. γ -Ray Applications [ J ]. Second Andean School chool Nuclear Physics, Bogota, colombia. October 2014. (http:// www.gfnun.unal.edu.co/andeanschool/curves/JGerl/Gamma-II-jg.pdf)", which is not described in detail herein.

In one embodiment, the workpiece table is not provided with the chuck rotation driving unit 60, and the multi-jaw chuck 10 is rotated manually.

The radiation source 20 may be any one of an X-ray source, a gamma-ray source, a neutron source, or other radiation sources, and the detector 30 is an imaging device that is configured with the radiation source 20, and may adopt a standardized product in the prior art. For example, when the MXR160/11HP tube from COMET is selected, CareView 750I from CARERAY may be selected.

For realizing the utility model discloses nondestructive test device still need set up other auxiliary components or auxiliary system, like plumbous room, cooling water, high pressure generator etc. all can refer to the relevant product direct implementation of YXLON company.

The motion unit is linear motion or rotary motion's basic function module, is the basic unit of setting up cartesian robot and all kinds of automation equipment, and the wide application is one of the essential important means of industrial automation, intellectuality, and specific realization structure relates to many spare parts such as linear guide, drive mechanism, driving motor, sensor, drive controller, removal work piece platform, base in precision finishing machinery, precision detection machinery, automatic processing, automatic assembly, on-line measuring, point is glued, the spraying, medical treatment, medicine, food, packing, electron, IC, the utility model discloses none is repeated, except that the special explanation, any direct-acting or pivoted module or spare part group all adopt prior art.

The workpiece 80 is only for convenience of description, not a necessary component of the present invention, and the automatic detection device lacking the workpiece 80 is still considered to fall into the protection scope of the present invention.

Since other types of inspection devices or manufacturing devices can be obtained by replacing the radiation source 35 or/and the detector 31, and the automatic device obtained thereby also has the above-mentioned essential technical solutions and main advantages, the inspection device or the nondestructive inspection device is not limited to the conventional literal meaning, but also includes all other types of inspection devices or manufacturing devices obtained by replacing the radiation source 35 or/and the detector 31.

Compared with the prior art, nondestructive test device has characteristics such as with low costs, simple structure, simple operation, be applicable to various types and size pipe fitting, need not change multi-jaw chuck 10 or work piece platform when work piece size is great, more need not change the complete machine, can adapt to the pipe fitting that has the bulge well moreover, assurance jumbo size work piece that can furthest is firmly fixed and not become flexible and rock.

Furthermore, the utility model discloses be particularly useful for light pipe fittings such as polyethylene pipe fitting, assurance jumbo size work piece that can furthest is firmly fixed and not hard up rock.

The structural members related to the embodiments of the present invention can be made of low carbon steel, and can also be made of light metal materials such as aluminum alloy and aluminum-magnesium alloy.

The fixing connection or the fixing installation or the fixing related to the embodiments of the present invention generally refers to any suitable or feasible manner such as a screw connection, an integrated structure designed and manufactured integrally, a welding, a riveting, a hole-shaft matching connection, a bonding, a bundling connection, etc., if no special description is provided. The bearing and the bearing cap are described in relation to embodiments or configurations which are conventional and will not be described in detail nor will they be provided with drawings.

The outsourcing or other prior art that the utility model discloses the embodiment relates to may relate to some parameters, structure, size, adaptability adjustment of procedure etc. in the concrete implementation process that uses with the utility model discloses each embodiment, and these adjustment field personnel can directly reach or concrete implementation, therefore do not have the specific description to avoid obscuring the fundamental principles and the gist of the utility model.

The details and embodiments of the present invention not described in detail can be directly embodied with reference to the prior art documents and the products sold or used in public, or have been used conventionally or widely known by those skilled in the art, and the present invention only describes the main differences between the technical solutions of the present invention and the prior art, so as not to obscure the fundamental principles and the gist of the present invention.

The above examples are only for illustrating the technical conception and the features of the present invention, and the purpose thereof is to enable one skilled in the art to understand the contents of the present invention and to implement the present invention, which should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

The above-mentioned embodiment is to the technical solution of the present invention has been described in detail, it should be understood that the above is only the specific embodiment of the present invention, not used for limiting the present invention, any modification, supplement or similar mode replacement etc. that the principle scope of the present invention is in should be included in the protection scope of the present invention.

Claims

1. The utility model provides a workpiece table, its characterized in that includes multi-jaw chuck and chuck extension device, multi-jaw chuck includes a chuck base and the jack catch more than two, chuck extension device includes that a plurality of chuck extends the piece, the quantity that the chuck extends the piece is the same with multi-jaw chuck's jack catch quantity, each the chuck extends the piece respectively fixed connection in multi-jaw chuck's jack catch and can follow the radial rectilinear movement of multi-jaw chuck is followed to the jack catch.

2. The workpiece table of claim 1, wherein the chuck extension block is separable from the jaws.

3. The workpiece table according to claim 1, wherein the left end and the right end of the chuck extension block are respectively provided with an outer clamping profile and a jaw matching profile, the jaw matching profile of the chuck extension block can correspond to the outer profile of the jaw and can be closely attached in a seamless or less manner, and the outer clamping profile can be closely attached to the outer circle or the inner circle of the workpiece.

4. The workpiece table of claim 3, wherein the outer clamping profile of the chuck extension block is a stepped inner circular profile, so that the workpiece can be clamped in a reverse-claw structure; or, the outside of chuck extension piece presss from both sides tight profile and is notch cuttype excircle profile, can realize that the positive claw structure presss from both sides tightly to the work piece.

5. The workpiece table of claim 1, wherein the chuck extension means further comprises one or more compression members engaging and compressing the respective chuck extension blocks in a direction parallel to the outer bottom surface of the multi-jaw chuck.

6. The workpiece table of claim 1, wherein the number of jaws of the multi-jaw chuck is two, three, four, five, six, or more, each jaw being evenly distributed along a circumferential direction of the multi-jaw chuck.

7. The workpiece table of claim 1, wherein the number of jaws of the multi-jaw chuck is three, and the bulge on the workpiece is located between two adjacent jaws.

8. A non-destructive inspection apparatus comprising a workpiece stage according to any of claims 1 to 7, including said multi-jaw chuck and chuck extension means, and including a gantry and a radiation inspection module, said radiation inspection module including a radiation source.

9. The nondestructive testing device according to claim 8,

10. The apparatus of claim 8 or 9, further comprising a compton backscatter detector located on the same side of the source as the source and outside the workpiece, the compton backscatter detector being fixed to and driven by the compton backscatter motion unit to adjust position or/and angle.