Defect detection device with ray shielding function

Abstract

The utility model provides a defect detection device with a ray shielding function. A plurality of shielding units are arranged in a feeding channel and a discharging channel. The shielding unit comprises a supporting frame, a driving roller and an annular shielding belt. Two supporting rollers which are coaxially arranged are arranged in the supporting frame, and a material channel is formed between the two supporting rollers. The driving roller is rotatably arranged in the supporting frame, and the driving roller is located above the supporting roller. The annular shielding belt surrounds the driving roller and the supporting roller, a feeding notch aligned to the material channel is formed in the annular shielding belt, and the width of the feeding notch is equal to that of the material channel. According to the defect detection device with the ray shielding function, rays in the feeding channel and the discharging channel can be shielded and blocked, the shielding unit is prevented from blocking the movement of materials, and meanwhile, the annular shielding belt is prevented from deforming and losing efficacy.

Description

Technical Field

[0001] The utility model belongs to the field of defect detection equipment, and particularly relates to a defect detection device with a ray shielding function. Background Art

[0002] With the rapid development of X-ray technology, its applications in the fields of medicine, industry, scientific research, etc. are becoming increasingly widespread. In the industrial field, due to its high energy and strong penetrability, X-rays are used for non-destructive detection of internal defects, cracks, inclusions, etc. in materials or products. However, while bringing convenience, X-rays also pose radiation safety problems that cannot be ignored. Long-term or high-intensity X-ray irradiation may cause skin damage, damage to germ cells, and a decline in immune function in the human body, and even induce serious diseases such as cancer.

[0003] In the prior art, a defect detection device based on X-rays needs to use a conveyor belt to send the item to be tested between the X-ray source and the detector. Therefore, X-rays are very easy to radiate outward along the material inlet and outlet of the equipment. Usually, those skilled in the art will set up lead-rubber shielding curtains at the material inlet and outlet to block the rays. However, the lead-rubber shielding curtains will obstruct the material during the process of material entry and exit. Therefore, the staff needs to frequently fold and roll it up, which will not only increase the labor burden of the staff, but also easily cause deformation and aging of the lead-rubber shielding curtains, thus affecting their ray shielding effect. Summary of the Utility Model

[0004] In view of this, the utility model aims to propose a defect detection device with a ray shielding function to solve the above technical problems.

[0005] To achieve the above object, the technical solution of the utility model is realized as follows:

[0006] A defect detection device with a ray shielding function includes a housing and a material conveyor belt. Inside the housing, there is a feeding channel, a detection cavity, and a discharging channel that are sequentially connected. One end of the material conveyor belt is arranged inside the feeding channel, and the other end is arranged inside the discharging channel. Inside the detection cavity, there is also a ray emitter and a detection table. The ray emitter is located above the material conveyor belt, and the detection table is located below the material conveyor belt;

[0007] A plurality of shielding units are provided inside both the feed channel and the discharge channel, and the shielding units are arranged above the material conveyor belt; the shielding unit includes: a support frame, a driving roller, and an annular shielding belt; two coaxially arranged support rollers are provided inside the support frame, and a material channel is formed between the two support rollers; the driving roller is rotatably arranged inside the support frame, the driving roller is parallel to the support rollers, and the driving roller is located above the support rollers; the annular shielding belt surrounds the outside of the driving roller and the support rollers, a feed cut corresponding to the material channel is provided on the annular shielding belt, and the width of the feed cut is equal to the width of the material channel; the rotation of the driving roller can drive the annular shielding belt to move around the driving roller and the support rollers, so as to adjust the position of the feed cut, so that the material to be detected on the material conveyor belt can enter and leave the shielding unit through the feed cut.

[0008] Further, the support roller includes a mounting sleeve and a connecting roller shaft, the mounting sleeve is detachably arranged on the support frame, one end of the connecting roller shaft is provided with a mounting shaft, and the mounting shaft is rotatably arranged inside the mounting sleeve.

[0009] Further, the support roller further includes an adjusting roller shaft, the adjusting roller shaft is arranged at one end of the connecting roller shaft away from the mounting shaft with adjustable position, and the outer diameter of the adjusting roller shaft is equal to the outer diameter of the connecting roller shaft.

[0010] Further, a through hole is provided on the end face of the connecting roller shaft close to the adjusting roller shaft, a threaded hole communicating with the through hole is provided on the side wall of the mounting shaft, and a set screw is provided inside the threaded hole; a connecting rod is provided on the end face of the adjusting roller shaft close to the connecting roller shaft, the connecting rod is slidably arranged inside the through hole, and the bottom end of the set screw abuts against the side wall of the connecting rod.

[0011] Further, guide strips are provided on the inner side wall of the through hole, and guide grooves for accommodating the guide strips are provided on the outer side wall of the connecting rod.

[0012] Further, the support frame includes two support plates, the two support plates are arranged mirror-symmetrically on both sides of the material conveyor belt, and the support plates are detachably connected to the housing; a first mounting hole for accommodating the driving roller and a second mounting hole for accommodating the support roller are provided on each support plate.

[0013] Further, radiation dose detectors are provided at one end of the feed channel away from the detection cavity and at one end of the discharge channel away from the detection cavity.

[0014] Further, a plurality of position sensors are provided inside both the feed channel and the discharge channel, and the plurality of position sensors are arranged in one-to-one correspondence with the plurality of shielding units.

[0015] Further, the annular shielding belt is made of lead rubber material.

[0016] Compared with the prior art, the defect detection device with a ray shielding function described in the present utility model has the following advantages:

[0017] (1) For the defect detection device with a ray shielding function described in the present utility model, shielding units are provided inside both the feeding channel and the discharging channel, and the shielding units are arranged above the material conveyor belt. Therefore, the rays in this device can be blocked and shielded by the shielding units, preventing the rays from radiating outward along the feeding channel and the discharging channel. Secondly, an annular shielding belt is provided inside the shielding unit of this device, and a feeding cut is provided on the annular shielding belt. When the material to be detected on the material conveyor belt approaches the shielding unit, the driving roller drives the annular shielding belt to move to adjust the position of the feeding cut, so that the material enters and leaves the shielding unit along the feeding cut, thus avoiding the shielding unit from obstructing the conveyance of the material. Compared with the prior art, by driving the annular shielding belt to move by the driving roller, this device can not only reduce the labor burden of the staff, but also prevent the annular shielding belt from deforming due to repeated folding and winding, thereby increasing the service life of the shielding unit. In addition, since multiple shielding units are provided inside both the feeding channel and the discharging channel, when any shielding unit has a shielding gap due to the passing of the material, other shielding units can provide a good shielding effect on the feeding channel and the discharging channel, enabling this device to complete ray detection during the process of conveying the material and improving the defect detection efficiency of the material.

[0018] (2) For the defect detection device with a ray shielding function described in the present utility model, its supporting roller includes a connecting roller shaft and an adjusting roller shaft with adjustable position. Before use, the staff can adjust the position of the adjusting roller shaft according to the internal width of the feeding cut, so that the adjusting roller shaft can well support the annular shielding belt in the edge area of the feeding cut, preventing the annular shielding belt in the edge area of the feeding cut from deforming. In addition, when the specifications of the material to be detected change, the staff can also disassemble and replace the annular shielding belt, so that the size of the feeding cut on the annular shielding belt matches the material specifications, and adjust the internal size of the material channel by adjusting the position of the adjusting roller shaft, thereby reducing the gap between the material and the feeding cut and further improving the ray blocking and shielding effect of the shielding unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings forming a part of this utility model are used to provide a further understanding of this utility model. The schematic embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation to this utility model. In the drawings:

[0020] Figure 1 is a schematic structural diagram of the defect detection device with a ray shielding function according to an embodiment of this utility model;

[0021] Figure 2 A cross-sectional view of the defect detection device with a ray shielding function according to an embodiment of the present invention;

[0022] Figure 3 A schematic structural view of the shielding unit according to an embodiment of the present invention;

[0023] Figure 4 A cross-sectional view of the shielding unit according to an embodiment of the present invention;

[0024] Figure 5 An exploded view of the shielding unit according to an embodiment of the present invention;

[0025] Figure 6 An exploded view of the support roller according to an embodiment of the present invention.

[0026] Explanation of reference numerals:

[0027] 1 - housing; 11 - ray emitter; 12 - inspection table; 2 - material conveyor belt; 3 - support plate; 31 - first mounting hole; 32 - second mounting hole; 4 - driving roller; 5 - annular shielding belt; 51 - feeding cut; 61 - mounting sleeve; 62 - connecting roller shaft; 621 - through hole; 622 - guiding strip; 63 - mounting shaft; 631 - threaded hole; 632 - set screw; 64 - adjusting roller shaft; 65 - connecting rod; 651 - guiding groove; 66 - bearing. Detailed implementation manners

[0028] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0029] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0030] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0031] The present utility model will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0032] A defect detection device with a ray shielding function, the structure of which can be schematically shown by Figure 1 and Figure 2 As shown in the figure, in this embodiment, the defect detection device with a ray shielding function includes a housing 1 and a material conveyor belt 2. Inside the housing 1, there are a feed channel, a detection cavity, and a discharge channel that are connected in sequence. One end of the material conveyor belt 2 is arranged inside the feed channel, and the other end is arranged inside the discharge channel. Inside the detection cavity, there are also a ray emitter 11 and a detection table 12. The ray emitter 11 is located above the material conveyor belt 2, and the detection table 12 is located below the material conveyor belt 2. When in use, the staff can place the material to be detected on the material conveyor belt 2, and the material conveyor belt 2 conveys the material to be detected into the detection cavity. The ray emitter 11 inside the detection cavity can emit X-rays to the material to be detected, and the detection table 12 can receive the X-rays passing through the material to be detected and judge whether there are defects in the material to be detected according to the change in the intensity of the X-rays.

[0033] To prevent the rays inside the device from radiating outward along the feed channel and the discharge channel, a plurality of shielding units are provided inside both the feed channel and the discharge channel, and the shielding units are arranged above the material conveyor belt 2, so as to block and shield the rays with the shielding units. Specifically, as Figures 3 - 6As shown in the figure, the shielding unit in this embodiment includes a support frame, a driving roller 4, and an annular shielding belt 5. There are two coaxially arranged support rollers inside the support frame. The driving roller 4 is rotatably arranged inside the support frame. The driving roller 4 is parallel to the support rollers and is located above the support rollers. The annular shielding belt 5 surrounds the outside of the driving roller 4 and the support rollers. During use, the annular shielding belt 5 can shield the area above the material conveyor belt to prevent rays from radiating outward along the feeding channel and the discharging channel. In addition, to facilitate the passing of the material to be detected on the material conveyor belt 2 through the shielding unit, a material channel should be formed between the two support rollers. Correspondingly, a feeding cut 51 that is aligned with the material channel is provided on the annular shielding belt 5, and the width of the feeding cut 51 is equal to the width of the material channel. When the material to be detected on the material conveyor belt 2 approaches the shielding unit, the staff can drive the driving roller 4 to rotate through a motor, so that the annular shielding belt 5 moves around the driving roller 4 and the support rollers. The movement of the annular shielding belt 5 can adjust the position of the feeding cut 51 to facilitate the passing of the material to be detected through the shielding unit along the feeding cut 51 and avoid hindering the movement of the material by the shielding unit.

[0034] Exemplarily, as Figure 2 shown in the figure, three shielding units can be provided inside both the feeding channel and the discharging channel of this device. When the material to be detected on the material conveyor belt 2 moves from left to right, the material will first approach the leftmost shielding unit. At this time, the annular shielding belt 5 on this shielding unit will rotate counterclockwise around the driving roller 4 and the support rollers so that the feeding cut 51 is aligned with the material, facilitating the material to enter the material channel of this shielding unit along the feeding cut 51. Subsequently, the material will continue to move to the right under the action of the material conveyor belt 2. At this time, the annular shielding belt 5 will also continue to rotate counterclockwise to avoid the inner wall of the feeding cut 51 from hindering the movement of the material. When the feeding cut 51 moves to the right side of this shielding unit, the material can leave this shielding unit along the feeding cut 51 and thus continue to move to the right.

[0035] Compared with the traditional shielding curtain, the shielding unit provided in this embodiment does not need to fold or roll up the annular shielding belt 5 during operation. Therefore, it can avoid the aging of the annular shielding belt 5 due to frequent deformation and ensure that the shielding unit maintains a good ray shielding effect during long-term use. Secondly, since this device can drive the annular shielding belt 5 to move through the driving roller 4, the labor intensity of the staff can be significantly reduced, thus improving the operation convenience of the non-destructive detection of materials. In addition, since multiple shielding units are provided inside both the feeding channel and the discharging channel, when any shielding unit has a shielding gap due to the passing of the material, other shielding units can produce a good shielding effect on the feeding channel and the discharging channel, so that this device can complete ray detection during the process of conveying materials and improve the defect detection efficiency of the materials.

[0036] It should be noted that the annular shielding belt 5 in this embodiment can be made of lead rubber material, and the staff can also select other flexible materials with good ray shielding effect in the prior art to make the annular shielding belt 5 to meet the ray shielding and blocking requirements of the shielding unit.

[0037] As an alternative implementation of this embodiment, in order to further improve the automation degree of the device, a plurality of position sensors (not shown in the figure) can be provided inside the feeding channel and the discharging channel, and the plurality of position sensors are arranged in one-to-one correspondence with the plurality of shielding units. During use, the position sensors can judge the position of the material to be detected on the material conveyor belt 2, so as to facilitate controlling the rotation speed of the driving roller 4 in each shielding unit, so that any shielding unit can adjust the feeding cut 51 to an appropriate position when the material approaches. In addition, the device can also be provided with ray dose detectors (not shown in the figure) at one end of the feeding channel far from the detection cavity and one end of the discharging channel far from the detection cavity. By setting the ray dose detectors, the ray amount at the end of the feeding channel and the end of the discharging channel can be monitored. When the ray amount exceeds the standard, it proves that there may be a fault in the shielding unit inside the device. At this time, the ray dose detector can issue an alarm to remind the staff to stop and maintain the device in time.

[0038] To realize the assembly between the components in the shielding unit, the support frame in this embodiment can include two support plates 3, and a first mounting hole 31 for accommodating the driving roller 4 and a second mounting hole 32 for accommodating the support roller are provided on each support plate 3. During assembly, the staff can first install the driving roller 4 and the support roller correspondingly inside the first mounting hole 31 and the second mounting hole 32, then sleeved the annular shielding belt 5 around the driving roller 4 and the support roller, and then arrange the two support plates 3 mirror-symmetrically on both sides of the material conveyor belt 2, and then detachably install the support plates 3 on the housing 1 through bolts to complete the assembly of the shielding unit.

[0039] As Figure 5 shown, the support roller can include a mounting sleeve 61 and a connecting roller shaft 62. The mounting sleeve 61 is detachably arranged on the support frame through bolts. One end of the connecting roller shaft 62 is provided with a mounting shaft 63. The mounting shaft 63 is placed inside the mounting sleeve 61, and the mounting shaft 63 is rotatably connected with the mounting sleeve 61 through a bearing 66. After the driving roller 4 starts to rotate, the annular shielding belt 5 will move around the driving roller 4 and the support roller. Since the connecting roller shaft 62 is rotatably connected with the mounting sleeve 61 through the mounting shaft 63, during the movement of the annular shielding belt 5, the connecting roller shaft 62 will rotate following the movement of the annular shielding belt 5, thereby reducing the movement resistance of the annular shielding belt 5 and facilitating the adjustment of the position of the feeding cut 51.

[0040] During actual use, the to-be-detected materials of different specifications have different external dimensions. Therefore, in order to reduce the gap between the feeding cut 51 and the to-be-detected materials and improve the ray shielding effect of this device, the staff can disassemble and replace the annular shielding belt 5 according to the specifications of the to-be-detected materials, so that the size of the feeding cut 51 on the annular shielding belt 5 matches the actual requirements. Correspondingly, when the replacement of the annular shielding belt 5 causes a change in the size of the feeding cut 51, in order to improve the support effect of the edge part of the feeding cut 51, the support roller may further include an adjusting roller shaft 64. During assembly, the adjusting roller shaft 64 with adjustable position is arranged at one end of the connecting roller shaft 62 far from the mounting shaft 63, and the outer diameter of the adjusting roller shaft 64 is equal to the outer diameter of the connecting roller shaft 62. The staff can adjust the position of the adjusting roller shaft 64 according to the actual size specification of the feeding cut 51, so that the side wall of the adjusting roller shaft 64 can support the annular shielding belt 5 at the edge part of the feeding cut 51 well, avoiding deformation in the area where the feeding cut 51 is located, and at the same time preventing the end of the adjusting roller shaft 64 from inserting into the feeding cut 51 and preventing the adjusting roller shaft 64 from obstructing the material from entering and leaving the shielding unit.

[0041] Optionally, to achieve the position adjustment ability of the adjusting roller shaft 64, as Figure 4 and Figure 6 shown, a through hole 621 can be provided on the end face of the connecting roller shaft 62 close to the adjusting roller shaft 64, and a connecting rod 65 can be provided on the end face of the adjusting roller shaft 64 close to the connecting roller shaft 62. During assembly, the staff can slidably arrange the connecting rod 65 inside the through hole 621. When it is necessary to adjust the position of the adjusting roller shaft 64, the staff can drive the adjusting roller shaft 64 to move towards or away from the connecting roller shaft 62 by sliding the connecting rod 65 inside the through hole 621, so as to form material channels with different widths between the adjusting roller shafts 64 of the two support rollers.

[0042] To facilitate locking the position of the adjusting roller shaft 64, a threaded hole 631 communicating with the through hole 621 can be provided on the side wall of the mounting shaft 63, and a set screw 632 is provided inside the threaded hole. After the adjusting roller shaft 64 is adjusted to an appropriate position, the staff can tighten the set screw 632 so that the bottom end of the set screw 632 abuts against the side wall of the connecting rod 65 to prevent the connecting rod 65 from sliding abnormally inside the through hole 621.

[0043] In addition, to prevent relative rotation between the adjusting roller shaft 64 and the connecting roller shaft 62, in this embodiment, a guiding strip 622 may be provided on the inner sidewall of the through hole 621, and a guiding groove 651 is provided on the outer sidewall of the connecting rod 65. After the connecting rod 65 is inserted into the through hole 621, the guiding strip 622 will be inserted into the guiding groove 651. Through the cooperation of the guiding strip 622 and the guiding groove 651, the circumferential position of the adjusting roller shaft 64 can be limited to ensure synchronous rotation of the adjusting roller shaft 64 and the connecting roller shaft 62.

[0044] The effects of the above solution will be described below:

[0045] This embodiment provides a defect detection device with a ray shielding function, which can block the feeding channel and the discharging channel through the shielding unit to prevent ray radiation. Secondly, the device is provided with a feeding cutout on the annular shielding belt. During material transportation, the movement of the annular shielding belt can adjust the position of the feeding cutout to facilitate the material to pass through the shielding unit. In addition, the device can also adjust the internal size of the material channel by changing the position of the adjusting roller shaft to adapt to feeding cutouts and materials to be detected of different sizes, and can support the annular shielding belt at the edge of the feeding cutout through the adjusting roller shaft to prevent deformation in the feeding cutout area.

[0046] It should be additionally noted that the ray emission source, the detection table, the position sensor, and the ray dose detector described in this embodiment are all existing products. Those skilled in the art can clearly and unambiguously determine the structures, basic principles, and usage methods of the above products through the prior art. Moreover, the above products are not the core inventive points of this application, so they will not be elaborated herein.

[0047] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A defect detection device with a radiation shielding function, comprising a housing (1) and a material conveyor belt (2), wherein a feed channel, a detection cavity and a discharge channel are sequentially connected inside the housing (1), one end of the material conveyor belt (2) is arranged inside the feed channel, and the other end is arranged inside the discharge channel, and a radiation emission source (11) and a detection platform (12) are also arranged inside the detection cavity, and the radiation emission source (11) is located above the material conveyor belt (2), and the detection platform (12) is located below the material conveyor belt (2), characterized in that: A plurality of shielding units are provided inside the feed channel and the discharge channel, and the shielding units are arranged above the material conveyor belt (2); the shielding unit comprises: a support frame, a driving roller (4) and an annular shielding belt (5); two coaxially arranged supporting rollers are provided inside the support frame, and a material channel is formed between the two supporting rollers; the driving roller (4) is rotatably arranged inside the support frame, the driving roller (4) is parallel to the supporting roller, and the driving roller (4) is located above the supporting roller; the annular shielding belt (5) surrounds the outside of the driving roller (4) and the supporting roller, and a feeding cutout (51) is provided on the annular shielding belt (5) which is aligned with the material channel, and the width of the feeding cutout (51) is equal to the width of the material channel; the rotation of the driving roller (4) can drive the annular shielding belt (5) to move around the driving roller (4) and the supporting roller, thereby adjusting the position of the feeding cutout (51), so that the material to be detected on the material conveyor belt (2) can enter and leave the shielding unit through the feeding cutout (51).

2. A defect detection device with radiation shielding function according to claim 1, characterized in that: The support roller comprises a mounting sleeve (61) and a connecting roller shaft (62); the mounting sleeve (61) is detachably arranged on a support frame; one end of the connecting roller shaft (62) is provided with a mounting shaft (63), and the mounting shaft (63) is rotatably arranged inside the mounting sleeve (61).

3. A defect detection device with radiation shielding function according to claim 2, characterized in that: The support roller also includes an adjusting roller shaft (64), which is adjustably arranged at one end of the connecting roller shaft (62) away from the mounting shaft (63), and the outer diameter of the adjusting roller shaft (64) is equal to the outer diameter of the connecting roller shaft (62).

4. A defect detection device with radiation shielding function according to claim 3, characterized in that: A through hole (621) is provided on the end surface of the connecting roller shaft (62) close to the adjusting roller shaft (64), a threaded hole (631) connected to the through hole (621) is provided on the side wall of the mounting shaft (63), and a fixing screw (632) is provided inside the threaded hole; a connecting rod (65) is provided on the end surface of the adjusting roller shaft (64) close to the connecting roller shaft (62), the connecting rod (65) is slidably arranged inside the through hole (621), and the bottom end of the fixing screw (632) abuts against the side wall of the connecting rod (65).

5. A defect detection device with radiation shielding function according to claim 4, characterized in that: A guide strip (622) is provided on the inner side wall of the through hole (621), and a guide groove (651) for accommodating the guide strip (622) is provided on the outer side wall of the connecting rod (65).

6. A defect detection device with radiation shielding function according to claim 1, characterized in that: The support frame comprises two support plates (3), the two support plates (3) are arranged in a mirror-image manner on both sides of the material conveyor belt (2), and the support plates (3) are detachably connected to the shell (1); each of the support plates (3) is provided with a first mounting hole (31) for accommodating a driving roller (4) and a second mounting hole (32) for accommodating a supporting roller.

7. A defect detection device with radiation shielding function according to claim 1, characterized in that: A radiation dose detector is provided at one end of the feed channel away from the detection cavity and at one end of the discharge channel away from the detection cavity.

8. The defect detection device with radiation shielding function according to claim 1, characterized in that: A plurality of position sensors are disposed inside the feed channel and inside the discharge channel, and the plurality of position sensors are arranged in one-to-one correspondence with the plurality of shielding units.

9. The defect detection device with radiation shielding function according to claim 1, characterized in that: The annular shielding belt (5) is made of lead rubber material.

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