Bar clamping device and bar detection device

Abstract

The invention relates to a bar clamping device and a bar detecting device. The bar clamping device comprises a mounting block which is in a hollow barrel shape and is used for mounting a plurality of ultrasonic probes and at least one eddy current probe; the one or two clamping devices are in a hollow barrel shape and are coaxially arranged with the mounting block, one end of each clamping device is in butt joint with one end of the mounting block, and each clamping device comprises a center barrel which is in a hollow barrel shape, is coaxially arranged with the mounting block and is provided with one or two rows of clamping through holes which are through in the radial direction in the axial direction; each row comprises at least two clamping through holes which are uniformly distributed in the circumferential direction of the central cylinder; the clamping blocks are arranged in the clamping through holes, one ends of the clamping blocks are located on the radial outer side of the center cylinder, and the other ends of the clamping blocks stretch into the radial inner side of the center cylinder and are used for abutting against the bar penetrating through the center cylinder; and the elastic component is arranged on the outer side of the clamping block and applies radial inward elastic force to the clamping block. The applicability of the bar clamping device is improved, a modular structure is achieved, the cost is reduced, and the detection efficiency is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of nuclear power plant detection of electrical connectors, and in particular to a bar clamping device and a bar detection device. Background Art

[0002] Control rods are a crucial means of controlling reactivity in nuclear power plants. They are subjected to the specialized conditions of high temperature, high radioactivity, and reciprocating mechanical motion over extended periods of operation. As nuclear power plant cycles increase, metal materials experience thermal aging, and the constant contact and friction between the control rods and guide plates causes wear. Furthermore, the absorbers within the control rods swell and even rupture after prolonged irradiation, leading to failure of the control rod assembly after a certain period of service. Therefore, regular inspections of the control rod cluster are necessary to assess wear rates and swelling trends, monitor the safety performance of core components, and ensure timely replacement of control rod cluster assemblies that could affect the reactor's next cycle, thereby ensuring reactor safety.

[0003] Fuel rods, exposed to radiation and internal and external forces during operation, can bend, twist, swell, or grow axially, posing operational risks. To ensure safe reactor operation, the bending and twisting conditions, outer diameter, and wall thickness of fuel rods leaving the reactor must be inspected. Any fuel rods exceeding these limits must be replaced.

[0004] Currently, the primary nondestructive testing methods for inspecting these rods in nuclear power plants are ultrasonic and eddy current testing. Ultrasonic testing is primarily used to measure the outer diameter and wall thickness of these tubes and rods, thereby detecting wear and swelling defects, while eddy current testing primarily detects cross-sectional area loss and cracks.

[0005] Ultrasonic testing in existing domestic testing technologies and equipment uses a rotating probe. This technology uses a motor-driven gear to rotate the ultrasonic probe to detect control rods. However, existing equipment has the following drawbacks:

[0006] 1. The scanning trajectory of the ultrasonic probe in the existing rotary probe is a spiral line. In order to ensure full coverage of the outer surface of the inspected rod bundle, the axial scanning speed of the rod bundle is limited, resulting in low detection efficiency.

[0007] 2. The existing ultrasonic probe and eddy current probe are arranged separately, and the rod bundle cannot be inspected and analyzed at the same time;

[0008] 3. The mechanical structure of the device in the prior art is complex, and a large number of motor drive structures are designed, resulting in poor equipment reliability and high repair and maintenance costs. Summary of the Invention

[0009] To overcome the problems existing in the related art, exemplary embodiments of the present disclosure provide a bar clamping device and a bar detecting device.

[0010] An exemplary embodiment of the first aspect of the present disclosure provides a rod clamping device, wherein the rod clamping device includes: a mounting block, which is hollow cylindrical and used to install multiple ultrasonic probes and at least one eddy current probe; one or two clampers, which are hollow cylindrical and coaxially arranged with the mounting block, and one end of each clamper is docked with one end of the mounting block, and the clamper includes: a center tube, which is hollow cylindrical and coaxially arranged with the mounting block, and has one or two rows of radially through clamping holes in the axial direction, each row includes at least two clamping holes and is evenly distributed around the circumference of the center tube; a clamping block, which is arranged in the clamping hole, one end of which is located radially outside the center tube, and the other end extends into the radially inside of the center tube for abutting against the rod passing through the center tube; and an elastic component, which is arranged on the outside of the clamping block and applies a radially inward elastic force to the clamping block.

[0011] In some embodiments, the holder further includes a sleeve, which is sleeved on the outside of the central tube.

[0012] In some embodiments, the elastic component includes: an O-ring or an annular spring, and the O-ring or the annular spring is sleeved on the outside of the clamping block.

[0013] In some embodiments, an annular groove is provided around the circumference of the central tube, and the O-ring or the annular spring is at least partially disposed in the annular groove. In some embodiments, the elastic component comprises a leaf spring or a compression spring, and the leaf spring or the compression spring is disposed between the inner wall of the sleeve and the clamping block.

[0014] In some embodiments, the sleeve is provided with one or more water holes for liquid to enter or be discharged from the inside of the sleeve.

[0015] In some embodiments, the clamp further includes: a first end cover fixedly connected to the first end face of the sleeve; a second end cover fixedly connected to the second end face of the sleeve, wherein the second end face is opposite to the first end face, and the second end cover is positioned and connected to the end face of the mounting block.

[0016] In some embodiments, a receiving groove is provided on the axial side of the clamping through hole; the clamping block is provided with a pin shaft, and the pin shaft is arranged in the receiving groove.

[0017] In some embodiments, the mounting block is provided with a plurality of first countersunk holes penetrating in the radial direction for mounting the ultrasonic probe; a first wire groove is provided on the side of the first countersunk hole for the line of the ultrasonic probe to pass through.

[0018] In some embodiments, the mounting block includes 8-16 first countersunk holes uniformly distributed along the circumference, and the first countersunk holes are arranged in two rows along the circumference of the mounting block, and the two rows of first countersunk holes are staggered.

[0019] In some embodiments, the mounting block is provided with one or two second countersunk holes coaxial with the mounting block for mounting the eddy current probe; a second wire groove is provided on the side of the second countersunk hole for the wire of the eddy current probe to pass through.

[0020] In a second aspect, according to some other exemplary embodiments, the present disclosure provides a rod inspection device, wherein the rod inspection device comprises: a rod clamping device as described in any one of the first aspects, the clamper of the rod clamping device is used to clamp the rod for positioning and centering; a plurality of ultrasonic probes mounted on the mounting block of the rod clamping device; and at least one eddy current probe mounted on the mounting block of the rod clamping device.

[0021] In some embodiments, the mounting block of the rod clamping device is provided with a plurality of first countersunk holes passing through in the radial direction, a first wire groove is opened on the side of the first countersunk hole, the ultrasonic probe is arranged in the first countersunk hole, and the line of the ultrasonic probe passes through the first wire groove; and / or, the mounting block is provided with one or two second countersunk holes coaxial with the mounting block, a second wire groove is opened on the side of the second countersunk hole; the eddy current probe is arranged in the second countersunk hole, and the line of the eddy current probe passes through the second wire groove.

[0022] In some embodiments, the rod detection device further includes: one or two fixing plates, each fixing plate being provided with a plurality of positioning holes; the clamp includes a first end cover, each first end cover being provided with a positioning boss, which cooperates with the positioning hole to positionally connect the clamp to the fixing plate.

[0023] The technical solutions provided by the embodiments of the present disclosure can provide the following beneficial effects: The mounting block of the bar clamping device of the present disclosure integrates an ultrasonic probe and an eddy current probe, enabling simultaneous ultrasonic and eddy current testing, effectively improving detection and analysis efficiency. The clamp ensures the clamping of the pipe / rod while achieving centering. The modular design of the device facilitates assembly and disassembly, simplifying repair and maintenance.

[0024] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present disclosure may be better understood by describing exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, in which:

[0026] Figure 1It is a structural schematic diagram of the bar clamping device disclosed in the present invention;

[0027] Figure 2 is a schematic structural diagram of a bar clamping device according to an exemplary embodiment of the disclosure;

[0028] Figure 3 It is a schematic diagram of the installation block space of the present disclosure;

[0029] Figure 4 It is the main view of the central block of the present disclosure;

[0030] Figure 5 It is a schematic diagram of the central block space of the present disclosure;

[0031] Figure 6 is a front view of the clamp disclosed herein;

[0032] Figure 7 is a spatial schematic diagram of the clamper disclosed herein;

[0033] Figure 8 is an exploded diagram of the structure of the bar material detection device disclosed in the present invention;

[0034] Figure 9 It is a structural schematic diagram of the bar material detection device disclosed in the present invention;

[0035] Figure 10 This is a simplified diagram of the bar material detection device disclosed herein when the elastic component is a leaf spring or a compression spring;

[0036] Figure 11 is a front view of the holder of the present disclosure including the end cap;

[0037] Figure 12 is a detection flow chart of the bar detection device disclosed herein;

[0038] Reference numerals:

[0039] 110, mounting block; 111, first countersunk hole; 112, first wire duct; 113, threaded hole; 114, second countersunk hole; 115, second wire duct;

[0040] 120, clamp; 121, center tube; 1211, clamping through hole; 1212, annular groove; 122, clamping block; 1221, pin; 123, elastic component; 124, sleeve; 1241, water hole; 125, first end cover; 126, second end cover; 127, fastening screw;

[0041] 130, pin; 131, pin hole;

[0042] 200. Ultrasonic probe;

[0043] 300, eddy current probe;

[0044] 400. Rods. DETAILED DESCRIPTION

[0045] The specific embodiments of the present disclosure will be described below. It should be noted that in the specific description of these embodiments, in order to provide a concise description, this specification cannot provide a detailed description of all the features of the actual embodiments. It should be understood that in the actual implementation of any embodiment, just as in the process of any engineering project or design project, in order to achieve the specific goals of the developer and to meet system-related or business-related restrictions, various specific decisions are often made, and this will also change from one embodiment to another. In addition, it is also understandable that although the efforts made in this development process may be complex and lengthy, for ordinary technicians in the field related to the content disclosed by this disclosure, some design, manufacturing or production changes based on the technical content disclosed by this disclosure are just conventional technical means and should not be understood as the content of this disclosure being insufficient.

[0046] Unless otherwise defined, the technical or scientific terms used in the claims and description shall have the usual meaning understood by persons of ordinary skill in the technical field to which the present disclosure belongs. The words "first", "second" and similar terms used in the patent application description and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "one" or "a" do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as "include" or "comprising" mean that the elements or objects appearing before "include" or "comprising" cover the elements or objects listed after "include" or "comprising" and their equivalents, and do not exclude other elements or objects. Words such as "connected" or "connected" and similar terms are not limited to physical or mechanical connections, nor are they limited to direct or indirect connections.

[0047] At present, in some related technologies, multiple ultrasonic probes and an eddy current probe are integrated into one module. However, this solution cannot properly clamp and center the inspected rod, resulting in reduced detection accuracy and poor reliability. It is also impossible to adjust the clamping force and the clamping contact area with the rod, which easily causes wear on the outer surface of the rod during the inspection process. It is also unable to adapt well to rods of different sizes.

[0048] In order to solve the above technical problems, the present disclosure provides a rod clamping device for detecting the outer surface of rods such as control rods or fuel rods in nuclear power plants, and can also be used to detect the outer surface of tubular or other cylindrical materials similar to rods. Figure 1As shown, the rod clamping device may include: a mounting block 110 and one or two clamps 120. The mounting block 110 may be hollow, cylindrical, and used to mount multiple ultrasonic probes 200 and at least one eddy current probe 300. There may be one or more mounting blocks 110, and they may be integrally formed or formed by combining multiple components to form a hollow structure. The rod 400 to be inspected may pass through the interior of the mounting block 110, thereby being inspected by the multiple ultrasonic probes 200 and at least one eddy current probe 300 mounted on the mounting block 110. The mounting block 110 is hollow, cylindrical, and its inner wall may be formed into a smooth cylindrical shape to prevent wear or impact on the rod 400 to be inspected. The outer surface of the hollow cylinder may be roughly cylindrical, or may be configured as another cylindrical structure. The mounting block 110 may be provided with mounting structures for mounting ultrasonic probes 200. Multiple ultrasonic probes 200 may be arranged circumferentially around the mounting block 110 to simultaneously inspect the outer surface of the rod 400 around its perimeter, without requiring the ultrasonic probes 200 to rotate about the rod 400 or the rod 400 itself to rotate about its axis. The mounting block 110 may be provided with multiple circumferentially arranged through-holes, within which the ultrasonic probes 200 may be positioned, with the transmitting ends of the ultrasonic probes 200 facing the interior of the mounting block 110 to inspect the outer surface of the rod 400 extending through the mounting block 110. Multiple ultrasonic probes 200 may be arranged circumferentially around the mounting block 110. The focal spot formed by each ultrasonic probe 200 on the outer surface of the inspected rod 400 represents the detection area. The focal spots of the multiple ultrasonic probes 200 can cover an annular area of ​​the outer surface of the rod 400, thereby improving detection efficiency. The mounting block 110 may also be provided with a mounting structure for at least one eddy current probe 300. The eddy current probe 300 may be an annular structure, through which the bar 400 to be inspected may pass, allowing the eddy current probe 300 to simultaneously inspect the outer circumference of the bar 400. Multiple eddy current probes 300 may be provided, arranged side by side in the axial direction, to improve inspection accuracy.

[0049] The clamp 120 can be designed as a hollow cylinder, allowing the rod 400 being inspected to pass through it and be reliably held and aligned by the clamp 120, thereby ensuring accurate and reliable testing. The clamp 120 can be coaxially arranged with the mounting block 110, with one end of the clamp 120 butting against one end of the mounting block 110, resulting in a centrally extending cylindrical structure. The inner diameters of the clamp 120 and the mounting block 110 can be identical. Alternatively, the inner diameters of the clamp 120 and the mounting block 110 can differ, ensuring that the clamped rod 400 does not excessively rub against the inner wall of the mounting block 110. The ends of the clamp 120 and the mounting block 110 can be provided with a connecting mechanism to provide a stable connection between the two. The connection can be detachable, facilitating replacement or maintenance. The end faces of the clamp 120 and the mounting block 110 can be provided with a positioning structure to ensure a secure and fixed mounting position.

[0050] The clamp 120 may include a central tube 121, a clamping block 122, and an elastic component 123. The central tube 121 is a hollow cylindrical structure as a whole, and is coaxially arranged with the mounting block 110. When the rod 400 is detected, the rod 400 passes through it. One or two rows of radially penetrating clamping holes 1211 may be provided in the axial direction. Each row may include at least two clamping holes 1211 and are evenly distributed in the circumference of the central tube 121. The clamping holes 1211 pass through the wall of the central tube 121. The clamping block 122 may be polygonal or cylindrical as a whole, and is arranged in the clamping hole 1211. One end is located on the radial outer side of the central tube 121, and the other end extends into the radial inner side of the central tube 121 to abut against the rod 400 passing through the central tube 121. The clamping block 122 can move radially along the central tube 121. The elastic component 123 can be disposed outside the clamping block 122 and exert a radially inward elastic force on the clamping block 122. Under the action of this elastic force, the clamping block 122 tends to move radially inward from the center tube 121. When the rod 400 has not penetrated the center tube 121, the elastic force of the elastic component 123 causes the clamping block 122 to be in its most retracted position, with its inner end protruding inward from the inner wall of the center tube 121. At this time, the radial distance between the clamping blocks 122 or between the clamping block 122 and the inner wall of the center tube 121 is less than or equal to the radial dimension of the inspected rod 400. The clamping blocks 122 and the center tube 121 can be provided with a matching limiting mechanism to prevent the clamping block 122 from becoming dislocated or falling into the center tube 121. Multiple clamping holes 1211 can be provided, distributed around the central tube 121. Multiple clamping blocks 122 are also distributed around the central tube 121. The bar 400 being tested is clamped between the multiple clamping blocks 122. In the disclosed embodiment, multiple clamping holes 1211 can be provided. Multiple clamping blocks 122 can clamp the bar 400 from different directions, and the clamping blocks 122 evenly distributed around the circumference provide more stable clamping.

[0051] In some embodiments, as Figure 4 、 Figure 5 As shown, the central tube 121 may include only one row of clamping through-holes 1211. The number of clamping through-holes 1211 may be 3, 4, or more, and may be evenly distributed in the circumferential direction. The bar clamping device may be provided with two clamps 120, located at both ends of the mounting block 110, respectively, to clamp the bar 400 from two positions, thereby achieving a better centering effect of the bar 400 and ensuring the accuracy of the detection. In other embodiments, the central tube 121 may include two rows of clamping through-holes 1211. The number of clamping through-holes 1211 in each row may be 3, 4, or more, and may be evenly distributed in the circumferential direction. Two rows of clamping through holes 1211 are arranged in the axial direction of the central tube 121, and the rod 400 can be clamped at different axial positions by multiple clamping blocks 122 through one clamp 120, so that the rod 400 can be better centering clamped by one clamp 120. The rod clamping device can adopt a mounting block 110 and a clamp 120, which is more convenient to install and the volume of the device, especially the axial length, can be reduced.

[0052] When the rod 400 passes through the center tube 121, under the pushing action of the rod 400, the clamping block 122 overcomes the elastic force and moves radially outward from the center tube 121. The inner end of the clamping block 122 still protrudes inward from the inner wall of the center tube 121, or at least is flush with the inner wall of the center tube 121, and maintains contact and a certain pressure on the rod 400 under the action of the elastic force. After the rod 400 passes through the center tube 121, and during the process of detecting the rod 400, the clamping block 122 maintains the push on the rod 400, and the clamping force is generated between the clamping blocks 122 or between the clamping block 122 and the inner wall of the center tube 121, so as to keep the relative position of the rod 400 and the rod clamping device in the radial direction basically stable, thereby ensuring the centering effect. Therefore, during the process of detecting the rod 400, the distance between the ultrasonic probe 200, the eddy current probe 300 and the outer surface of the rod 400 is relatively fixed, the detection result is more accurate and reliable, and the error caused by the unstable position of the rod 400 is avoided. Furthermore, by passing the clamping block 122 through the clamping hole 1211 of the center tube 121 and cooperating with the elastic component 123 to provide elastic force, the clamping block 122 can move radially within a certain range, thereby being able to adapt to rods 400 of different sizes, thereby improving the applicability of the rod clamping device. Rods 400 that do not exceed the inner diameter of the center tube 121 and the mounting block 110 can be inspected, and fuel rods, control rods, and other rods and pipes of different sizes can be applied. In addition, the clamping and centering functions are achieved by the clamp 120, and the mounting block 110 is mainly used to fix and install the ultrasonic probe 200 and the eddy current probe 300, realizing a modular structure, which is convenient for replacement or substitution according to actual needs to adapt to more practical scenarios. In addition, when a module fails, only partial adjustment or replacement is required, thereby reducing costs and improving efficiency.

[0053] In some embodiments, as Figure 6 As shown, the inner end face of the clamping block 122 can be provided with chamfers on both sides of the axial direction. The chamfers can be inclined surfaces or arc surfaces, so as to avoid damage to the end face or side face of the rod 400 when the rod 400 is inserted, and can also ensure the contact area between the clamping block 122 and the rod 400, ensure the reliability of clamping and the centering effect, thereby improving the accuracy of detection.

[0054] In some embodiments, as Figure 8 、 Figure 9As shown, the clamp 120 may further include a sleeve 124, which is sleeved on the outside of the center tube 121. The sleeve 124 as a whole may be a hollow cylinder, with an inner diameter larger than the outer diameter of the center tube 121. The sleeve 124 can basically cover the peripheral side of the center tube 121, thereby protecting the center tube 121, the clamping block 122 and the elastic component 123, avoiding bumps and wear on the center tube 121, the clamping block 122 and the elastic component 123 during installation and use, and also avoiding affecting the centering effect of the clamping block 122 clamping the rod 400, thereby ensuring detection accuracy. In some embodiments, the end face of the sleeve 124 and the end face of the mounting block 110 are matingly connected, and the two may be respectively provided with corresponding connection structures, so that the positional relationship between the clamp 120 and the mounting block 110 is accurate and the connection is reliable.

[0055] In some embodiments, as Figure 6 、 Figure 7 As shown, the elastic component 123 may include an O-ring or an annular spring, which is sleeved on the outside of the clamping block 122. The O-ring can be an annular elastic member made of rubber or other elastic material, which can be sleeved and fastened to the outside of the clamping block 122. Through its own inward elasticity, it applies an elastic force to the clamping block 122, thereby clamping the rod 400. It is also suitable for rods 400 of different thicknesses. The annular spring can be made of metal and is generally annular. The elastic force of the spring applies a radially inward elastic force to the clamping block 122. The O-ring or annular spring can be easily installed and removed, and can apply the same elastic force to multiple clamping blocks 122, resulting in a better centering effect and improved detection accuracy.

[0056] In some embodiments, the elastic component 123 can be an O-ring or an annular spring, which is sleeved on the axial center of the clamping block 122. A single elastic component 123 is more convenient to install and has lower costs. Alternatively, an O-ring or annular spring with a certain width in the axial direction can be used to increase the contact area with the clamping block 122 and ensure stable application of the elastic force. In other embodiments, the elastic component 123 can include multiple O-rings or multiple annular springs, which are sleeved on the clamping block 122 and evenly distributed in the axial direction of the clamping block 122, so that the clamping block 122 can apply uniform force.

[0057] In some embodiments, as Figure 4 、 Figure 5As shown, an annular groove 1212 is provided around the circumference of the center tube 121, and the O-ring or annular spring is at least partially provided in the annular groove 1212. There can be one or more annular grooves 1212, and multiple annular grooves 1212 can be evenly arranged along the axial direction of the center tube 121; when the O-ring or annular spring is sleeved on the outside of the clamping block 122, the part that is not in direct contact with the clamping block 122 can be provided in the annular groove 1212, which can limit the axial movement of the O-ring or annular spring, and avoid the O-ring or annular spring from being separated from the clamping block 122 and the center tube 121 during installation and use, thereby improving the reliability of the bar clamping device.

[0058] In some embodiments, the outer end surface of the clamping block 122 can be provided with one or more positioning grooves, and the elastic component 123, such as an O-ring or annular spring, can be set in the positioning groove to avoid separation during installation or use, thereby improving the reliability of the rod clamping device.

[0059] In some embodiments, as Figure 10 As shown, the elastic component 123 may include: a leaf spring or a compression spring, which is arranged between the inner wall of the sleeve 124 and the clamping block 122. In the embodiment of the present disclosure, the leaf spring and the compression spring may be made of metal, and exert elastic force on the clamping block 122 based on their own elasticity. One end is fixed or clamped to the inner wall of the sleeve 124, and the other end abuts against the outer end surface of the clamping block 122. The leaf spring or the compression spring can exert a greater and more reliable elastic force on the clamping block 122, which can better clamp the rod 400. In addition, the leaf spring and the compression spring are independently arranged. In the event that a leaf spring or a compression spring corresponding to one of the multiple clamping blocks 122 fails, the rod clamping device can still meet the detection requirements.

[0060] In some embodiments, the sleeve 124 and the center tube 121 have a circumferential positioning mechanism to ensure that the sleeve 124 and the center tube 121 are circumferentially fixed, thereby ensuring that the elastic component 123 corresponds to the position of the clamping block 122. The positioning mechanism is respectively connected to the center tube 121 and the sleeve 124 through at least one of the first end cover 125 and the second end cover 126, thereby achieving the positioning of the center tube 121 and the sleeve 124. In other embodiments, the center tube 121 includes a plurality of clamping through holes 1211, which are evenly distributed along the circumference. The clamping through holes 1211 are evenly distributed along the circumference, thereby making it easier to position the sleeve 124 and the center tube 121, and making it easier to meet the position correspondence between the elastic component 123 and the clamping block 122. In yet other embodiments, the inner wall of the sleeve 124 can be provided with a positioning groove, the positioning groove being arranged corresponding to the position of the clamping block 122, and one end of the spring or compression spring being arranged in the positioning groove. The positioning groove makes it easier to install and fix one end of the spring or the compression spring, and also enables the elastic force to be applied vertically to the outer end surface of the clamping block 122 .

[0061] In some embodiments, as Figure 8 、 Figure 9 As shown, the sleeve 124 may be provided with one or more water holes 1241 for liquid to enter or be discharged from the inner side of the sleeve 124. In the process of detecting the rod 400, the embodiment of the present disclosure performs detection while immersed in liquid. The water holes 1241 are provided on the sleeve 124, which can facilitate the liquid to enter the mounting block 110, so that the liquid can fill the space between the probe and the rod 400 to be detected more quickly and conveniently, avoiding the adverse effects on the detection results caused by slow liquid entry or incomplete liquid filling and the presence of bubbles. In the embodiment of the present disclosure, the water holes 1241 can be radial through holes. The water holes 1241 can also be through grooves provided on the axial edge of the sleeve 124, such as Figure 8 As shown, the water hole 1241 is connected to the axial edge, which can more efficiently flow in and out of the liquid. The water hole 1241 can be set as one or more. The multiple water holes 1241 can be distributed along the axial direction or the circumferential direction, or as shown in FIG. Figure 8 As shown, multiple water holes 1241 are provided at both ends of the sleeve 124 in the axial direction and staggered in the circumferential direction, thereby better ensuring the efficiency of liquid entry and discharge, and ensuring that the liquid fills the interior of the rod clamping device.

[0062] In some embodiments, as Figure 11As shown, the clamp 120 may further include: a first end cap 125 fixedly connected to the first end face of the sleeve 124; a second end cap 126 fixedly connected to the second end face of the sleeve 124, wherein the second end face is opposite to the first end face, and the second end cap 126 is positioned and connected to the end face of the mounting block 110. In the embodiment of the present disclosure, the first end cap 125 and the second end cap 126 are both annular structures, forming a space in the middle to allow the inspected rod 400 to pass through. The first end cap 125 and the second end cap 126 can be fixedly connected to the two end faces of the sleeve 124 respectively. In some embodiments, the first end cap 125 and the second end cap 126 can be connected to the end faces of the sleeve 124 respectively by threaded connection, screw fixing, etc. The first end cap 125 and the second end cap 126 are independently connected to the sleeve 124, so that they can be connected and removed separately, which facilitates the installation and replacement of the device. In other embodiments, the first end cap 125 may be provided with one or more countersunk holes, the side wall of the sleeve 124 may be provided with corresponding axially extending light holes or threaded holes, and the second end cap 126 may be provided with corresponding one or more threaded holes. Screws are passed through the first end cap 125, the sleeve 124, and the second end cap 126 to achieve the three-way fixation. In this way, the first end cap 125, the sleeve 124, and the second end cap 126 can be conveniently fixed and the positioning of the three can be ensured. Similarly, countersunk holes can be provided in the second end cap 126, and threaded holes can be provided in the first end cap 125. By providing the first end cap 125 and the second end cap 126, the center tube 121 and the clamping block 122 can be better protected and installation and positioning can be facilitated.

[0063] In some embodiments, as Figure 11 As shown, an annular groove 1212 can be provided on the circumference of the center tube 121, and an O-ring or annular spring can be provided in the annular groove 1212. During the screw connection installation process of the first end cover 125 and the second end cover 126, the O-ring or annular spring is sleeved on the outside of the clamping block 122, and the part not in contact with the clamping block 122 is received in the annular groove 1212 of the center tube 121, thereby reducing the volume of the O-ring or annular spring exposed on the outside of the center block, reducing the overall volume of the clamp 120, and avoiding the installation position of the mounting screws during the installation process or subsequent use, thereby preventing the O-ring or annular spring from being inserted into the clamping block 122. The spring interferes with the mounting screw; the installation position of the mounting screw can be staggered with the clamping block 122, and is set on the outside of the annular groove 1212 for accommodating the O-ring or the annular spring, radially limiting the O-ring or the annular spring to prevent the clamping block 122 and the O-ring or the annular spring from separating from the center tube 121; when the elastic component 123 is a spring leaf or a compression spring, the spring leaf or the compression spring is set on the outside of the clamping block 122 and abuts against the outer end face of the clamping block 122, which can avoid the installation position of the mounting screw and prevent the spring leaf or the compression spring from interfering with the mounting screw; the safety and stability of the installation of the clamp 120 are improved.

[0064] In some embodiments, as Figure 8 As shown, the outer end surface of the second end cap 126 can be provided with a structure that mates with the mounting block 110 to achieve a positional connection between the clamp 120 and the end surface of the mounting block 110. The outer end surface of the second end cap 126 can be provided with one or more protrusions, and the end surface of the mounting block 110 can be provided with corresponding positioning holes. The protrusions are inserted into the positioning holes to achieve quick positioning and installation, ensuring the coaxial positioning of the mounting block 110 and the clamp 120. Similarly, the end surface of the mounting block 110 can be provided with one or more protrusions, and the outer end of the second end cap 126 can be provided with corresponding positioning holes, so that the two can be positioned. Similarly, the outer end surfaces of the mounting block 110 and the second end cap 126 can be provided with protrusions and corresponding mounting holes. In some embodiments, the outer end surface of the second end cap 126 and the end surface of the mounting block 110 can be provided with one or more pin holes 131, respectively. The pin 130 is inserted into the corresponding pin holes 131 in the second end cap 126 and the mounting block 110 to achieve a positional connection. This method allows for easy installation and removal of the mounting block 110 and the clamp 120, forming an independent module for easy maintenance or replacement. Furthermore, once connected, the mounting block 110 and the clamp 120 remain coaxial, preventing radial misalignment that could lead to misalignment and inaccurate testing, and also preventing collisions with the rod 400.

[0065] In some embodiments, as Figure 6 、 Figure 7 As shown, a receiving groove may be provided on the axial side of the clamping through hole 1211; the clamping block 122 may be provided with a pin 1221, which is provided in the receiving groove. Figure 6 、 Figure 7As shown, pins 1221 are provided on both sides of the clamping block 122 and are arranged in the receiving groove, so as to limit the axial movement of the clamping block 122 in the central tube 121, and the receiving groove can also limit the maximum depth of the clamping block 122 in the radial direction. Moreover, the pins 1221 can also serve as a rotating axis to enable the clamping block 122 to rotate, so as to adjust or adapt to the contact area with the rod 400, thereby ensuring the centering effect of the rod 400. The receiving groove on the axial side of the clamping through hole 1211 can be axially arranged in parallel with the annular groove 1212 around the circumference of the center tube 121, and the O-ring or annular spring is tightened inward to provide a clamping force for the clamping block 122. The part of the O-ring or annular spring that is not in direct contact with the clamping block 122 is tightened inward and arranged in the annular groove 1212. There can be multiple annular grooves 1212, and multiple annular grooves 1212 are arranged on both sides of the axial direction of the receiving groove, and the O-ring or annular spring is arranged in each annular groove 1212; the receiving groove on the axial side of the clamping through hole 1211 can also be an annular groove 1212, and the pin shaft 1221 and the O-ring or annular spring on both sides of the clamping block 122 can be arranged in the same annular groove 1212, thereby further limiting the axial movement of the clamping block 122 in the center tube 121, ensuring the centering effect of the rod 400, and improving the stability of the clamping.

[0066] In some embodiments, as Figure 3 As shown, the mounting block 110 may be provided with a plurality of first countersunk holes 111 extending radially therethrough for mounting the ultrasonic probe 200. A first wire groove 112 is provided on the side of the first countersunk hole 111 for passing the wire of the ultrasonic probe 200. Figure 2 As shown, the mounting block 110 installs the ultrasonic probe 200 through the countersunk hole, which can ensure the distance between the ultrasonic probe 200 and the rod 400 to be tested, and can make the outer surface of the mounting block 110 neater and avoid bumps. The ultrasonic probe 200 is set in the countersunk hole, and the line needs to be led out. By setting the first wire groove 112, the line of the ultrasonic probe 200 can be led out more conveniently. The line can include power lines, signal lines, etc. The first wire groove 112 can extend a certain length along the side wall of the mounting block 110, making the line smoother and avoiding the bending and deformation of the line of the ultrasonic probe 200, which may cause damage or failure.

[0067] In some embodiments, as Figure 3 As shown, one end face of the mounting block 110 is provided with an axial threaded hole 113 connected to the first countersunk hole 111, which is used to install a fastening screw 127 to fasten the ultrasonic probe 200 in the first countersunk hole 111, thereby ensuring that the position of the ultrasonic probe 200 is fixed, avoiding sliding or falling off, and improving detection accuracy.

[0068] In some embodiments, as Figure 3As shown, the mounting block 110 can be provided with a row of first countersunk holes 111. The number of first countersunk holes 111 can be four or more, for example, eight or twelve. Due to limited circumferential space within a row, a certain number of countersunk holes can be used to meet the coverage requirements of the focal spot of the ultrasonic probe 200. The first countersunk holes 111 can also be evenly distributed along the circumference, so that the focal spots of all ultrasonic probes 200 disposed in the first countersunk holes 111 can fully cover the outer circumference of the bar 400 under test.

[0069] In other embodiments, the mounting block 110 may include 8-16 first countersunk holes 111 evenly distributed along the circumference. The first countersunk holes 111 are arranged in two rows along the circumference of the mounting block 110, with the two rows of first countersunk holes 111 staggered. Due to the limited circumference of the mounting block 110, the number of ultrasonic probes 200 that can be installed is also limited. To ensure better focal spot coverage, two rows of first countersunk holes 111 can be provided to accommodate two rows of ultrasonic probes 200. The two rows of first countersunk holes 111 are staggered circumferentially, so that the ultrasonic probes 200 in the first row are located between the two ultrasonic probes 200 in the second row. This allows for overlapping focal spots and improves detection accuracy. In some specific examples, eight first countersunk holes 111 can be provided in each row, for a total of two rows. This improves detection accuracy and facilitates the location of detected surface defects.

[0070] In some embodiments, as Figure 3 As shown, the mounting block 110 may be provided with one or two second countersunk holes 114 coaxial with the mounting block 110 for mounting the eddy current probe 300; a second wire groove 115 may be provided on the side of the second countersunk hole 114 for the wire of the eddy current probe 300 to pass through. Figure 3 As shown, the mounting block 110 is provided with a second countersunk hole 114 in the axial direction, and the inner wall of the mounting block 110 is formed with a stepped surface, and the eddy current probe 300 can be arranged in the second countersunk hole 114. The second countersunk hole 114 can be provided with one, which is located at one end of the mounting block 110, and is detected by an eddy current probe 300. The mounting block 110 can also be provided with a second countersunk hole 114 at each end, so that two eddy current probes 300 can be installed to further improve the detection effect and accuracy of the eddy current probe 300. On the side of the second countersunk hole 114, a second wire groove 115 that is basically radially through can be opened to lead out the line of the eddy current probe 300 to avoid the line of the eddy current probe 300 from bending and deforming, which may cause damage or failure.

[0071] Based on the same inventive concept, the present disclosure also provides a rod inspection device for inspecting fuel rods, control rods and other rods in nuclear power plants. It can also inspect other rods or tubular materials to detect changes or defects in outer diameter and overall shape. Figure 2As shown, the bar inspection device may include: a bar clamping device as described in any of the aforementioned embodiments, multiple ultrasonic probes 200, and at least one eddy current probe 300. The clamp 120 of the bar clamping device can be used to clamp the bar 400 for positioning and centering. The bar 400 is vertically inserted into the bar clamping device. The clamp 120 of the bar clamping device clamps the bar 400 and applies a uniform inward pressing force along the circumference of the inspected bar 400 to ensure clamping stability and maintain the centering of the bar 400. The bar inspection device may include multiple ultrasonic probes 200, which can be installed in the mounting block 110 of the bar clamping device to inspect the inspected bar 400 for wear and swelling defects. The bar inspection device may also include at least one eddy current probe 300, which can be installed in the mounting block 110 of the bar clamping device to inspect the inspected bar 400 for cross-sectional loss and crack defects. The bar material inspection device can simultaneously complete the clamping, ultrasonic flaw detection and eddy current flaw detection of the inspected bar material 400 , and has a high inspection efficiency.

[0072] In some embodiments, as Figure 2 As shown, the bar material inspection device can be assembled by sequentially assembling a number of ultrasonic probes 200 onto the mounting block 110. The ultrasonic probes 200 are secured to prevent loosening by tightening the screws 127 in the threaded holes 113 connected to the first countersunk holes 111. The wiring of the ultrasonic probes 200 is then routed through the first wire slot 112. The eddy current probe 300 is then installed in the second countersunk hole 114 of the mounting block 110, with its signal line routed through the second wire slot 115. The holder 120 is then assembled to the mounting block 110 using the pins 130.

[0073] In some embodiments, when the clamping effect of the clamp 120 is not good, for example, the clamping block 122 of the clamp 120 is severely worn or the O-ring is aged, and when replacement is required, a new clamp 120 can be pre-assembled, and the original clamp 120 can be disengaged along the axial direction of the device, and the pre-assembled clamp 120 can be replaced. This is convenient and fast, and does not affect the detection progress. In some embodiments, when problems such as probe failure occur, a new mounting block 110 can also be pre-assembled, and the original mounting block 110 can be disengaged from the clamp 120 and replaced with a new mounting block 110; the tightening screws on the original probe mounting block 110 can also be loosened, and the faulty ultrasonic probe 200 can be replaced, or the eddy current probe 300 can be pushed out from the mounting block 110 along the axial direction and then replaced. Through a modular setting, replacement can be made more convenient and quick.

[0074] In some embodiments, as Figure 2As shown, the mounting block 110 of the bar clamping device can be provided with a plurality of radially extending first countersunk holes 111. A first wire slot 112 can be provided lateral to the first countersunk holes 111, extending through the first countersunk holes 111. The ultrasonic probe 200 can be mounted within the first countersunk holes 111, allowing it to be fully submerged within the mounting block 110 to prevent interference between the ultrasonic probe 200 and the bar 400 being tested or with the outside world. An axial threaded hole 113 can be provided at the end of the mounting block 110, extending through the first countersunk hole 111. When installing the ultrasonic probe 200, a fastener can be inserted through the threaded hole 113 to securely mount the ultrasonic probe 200 within the first countersunk hole 111 of the probe mounting block 110, preventing the ultrasonic probe 200 from becoming loose. The wiring of the ultrasonic probe 200 can be routed through the first wire slot 112, preventing damage caused by bending or deformation of the wiring of the ultrasonic probe 200. The mounting block 110 may be provided with one or two second countersunk holes 114 coaxial with the mounting block 110. The eddy current probe 300 may be disposed within the second countersunk holes 114. The eddy current probe 300 may be completely submerged within the mounting block 110, preventing interference between the eddy current probe 300 and the inspected bar 400 or the outside world. A second wire slot 115 may be provided on the side of the second countersunk hole 114, extending through the second countersunk hole 114. The eddy current probe 300 may be disposed within the second countersunk hole 114. Since the eddy current probe 300 is mounted on the end of the mounting block 110, the eddy current probe 300 can be secured by the positioning connection between the mounting block 110 and the holder 120. The wiring of the eddy current probe 300 can pass through the second wire slot 115, preventing damage caused by bending and deformation of the wiring of the eddy current probe 300. The installation method of the ultrasonic probe 200 and the eddy current probe 300 in the bar clamping device can effectively prevent the ultrasonic probe 200 and the eddy current probe 300 from being damaged or failing.

[0075] When using this bar inspection device for testing, the ultrasonic probe 200, eddy current probe 300, and bar clamping device are assembled and immersed in water. A bar 400 to be inspected is then inserted into the bar inspection device. The bar 400 and the device move relative to each other in the axial direction while the ultrasonic probe 200 and eddy current probe 300 inspect the bar 400. Once the bar 400 has fully exited the device, the inspection is complete.

[0076] During the detection process, the circumference of the rod 400 is detected by multiple circumferentially distributed ultrasonic probes 200 and an annular eddy current probe 300. This can be achieved by moving the rod 400 and fixing the rod detection device to achieve relative axial movement between the two, or by fixing the rod 400 and moving the rod detection device, or both can move axially. Through the rod detection device disclosed in the present invention, there is no need for the rod 400 or the rod detection device to rotate or move, which simplifies the mechanism, makes the relative position of the two more stable, and improves the detection accuracy. In addition, through the clamping method of the clamp 120 disclosed in the present invention, the centering effect can be better guaranteed, so that during the detection process, the rod 400 always remains aligned with the rod detection device, improving the detection reliability. In addition, the clamping force of the clamp 120 can be adjusted and easily replaced, so that it can adapt to rods 400 of different sizes.

[0077] In some embodiments, as Figure 8 As shown, the bar material inspection device may further include: one or two fixing plates. The fixing plates may have multiple positioning holes axially defined on their end surfaces; the clamp 120 may include a first end cap 125. The first end cap 125 of the clamp 120 may be a hollow circular plate, allowing the bar material 400 to pass through the center of the first end cap 125 and thus into the clamp 120. The first end cap 125 may be provided with a positioning boss that engages with the positioning hole to positionally connect the clamp 120 to the fixing plate.

[0078] When using the bar testing device for testing, if Figure 12 As shown, the following steps may be included, but the present disclosure limits the detection method to the following methods:

[0079] S101: Assemble all components, install the ultrasonic probe 200 and eddy current probe 300 in the bar clamping device mounting block 110, tighten the ultrasonic probe 200; connect the mounting block 110 and the clamp 120; install the bar inspection device on the inspection tooling;

[0080] S102: On-water calibration and verification. After the bar detection device is installed, a specific calibration tube or calibration assembly is inserted into the bar detection device to calibrate and verify the ultrasonic probe 200 and eddy current probe 300.

[0081] S103: Put the bar material detection device into water. Vertically immerse the bar material detection device into water;

[0082] S104: Underwater calibration verification. Use a specific calibration tube or calibration component to insert it into the bar detection device to perform calibration verification on the ultrasonic probe 200 and the eddy current probe 300;

[0083] S105: Insert the bar 400 to be tested into the bar testing device from top to bottom. The bar 400 passes through the clamp 120 and the mounting block 110 in sequence;

[0084] S106: Use the eddy current probe 300 and the ultrasonic probe 200 to perform the inspection. When the bar 400 to be inspected passes from top to bottom, the eddy current probe 300 in the mounting block 110 generates an eddy current induced magnetic field. The bar 400 to be inspected passes through the eddy current induced magnetic field. When there is a crack on the bar 400 to be inspected, the eddy current induced magnetic field changes. The eddy current probe 300 detects the change in the eddy current induced magnetic field and feeds back information. According to the feedback information, the cross-sectional loss rate and crack defect of the bar 400 to be inspected are obtained. When the bar 400 to be inspected passes from top to bottom, the ultrasonic probe 200 in the mounting block 110 emits an ultrasonic wave. After the ultrasonic wave reaches the surface of the bar 400 to be inspected, it is reflected back to the ultrasonic probe 200. The ultrasonic probe 200 records the time difference between the ultrasonic emission time and the time it takes for the ultrasonic wave to reflect back to the origin. This time difference is then divided by two and multiplied by the speed of sound to obtain a profile change diagram of the bar 400 to be inspected. The ultrasonic probe 200 then feeds back this profile change information, and based on this feedback, the wear and swelling defects of the bar 400 to be inspected are determined. 8-16 ultrasonic probes 200 can perform a full profile inspection of the bar 400 to be inspected, improving inspection efficiency.

[0085] S107: Underwater calibration and verification. After completing the inspection of the rod 400, the specific calibration tube or calibration component is inserted into the rod inspection device again to calibrate and verify the ultrasonic probe 200 and the eddy current probe 300 to ensure the accuracy of the inspection;

[0086] S108: Remove the bar inspection device. If the calibration review is qualified, or if the calibration review is unqualified, take subsequent remedial measures. Repeat steps S101-S108 to re-test.

[0087] The bar material inspection device and inspection method can simultaneously complete the clamping and centering, ultrasonic flaw detection, and eddy current flaw detection of the inspected bar material 400, with high inspection efficiency. Through multiple calibration and verification, the inspection accuracy can be guaranteed.

[0088] This application uses specific terms to describe the embodiments of this application. For example, "one embodiment," "an embodiment," and / or "some embodiments" refer to a certain feature, structure, or characteristic associated with at least one embodiment of this application. Therefore, it should be emphasized and noted that "one embodiment," "an embodiment," or "an alternative embodiment" mentioned twice or multiple times in different locations in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this application may be appropriately combined.

[0089] In the context of this application, unless the context clearly indicates an exception, the words "a," "an," "an," and / or "the" do not refer to the singular and may include the plural. Generally speaking, the terms "comprise" and "include" only indicate the inclusion of the steps and elements specifically identified, and these steps and elements do not constitute an exclusive list. A method or device may also include other steps or elements.

[0090] Similarly, it should be noted that, in order to simplify the description of this application and thus facilitate understanding of one or more embodiments of the application, the foregoing description of the embodiments of this application sometimes combines multiple features into a single embodiment, figure, or description thereof. However, this disclosure method does not mean that the subject matter of this application requires more features than those recited in the claims. In fact, the features of an embodiment may be fewer than all the features of the individual embodiments disclosed above.

[0091] The basic concepts have been described above. It will be apparent to those skilled in the art that the above disclosure is merely illustrative and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and amendments to the present application. Such modifications, improvements, and amendments are suggested in the present application and remain within the spirit and scope of the embodiments of the present application.

Claims

1. A bar clamping device, wherein: The bar clamping device comprises: A mounting block, which is in the shape of a hollow cylinder and is used to mount a plurality of ultrasonic probes and at least one eddy current probe; One or two holders are hollow cylindrical and coaxially arranged with the mounting block, one end of each holder is butted with one end of the mounting block, and the holder comprises: The central tube is in a hollow cylindrical shape and is coaxially arranged with the mounting block. One or two rows of radially penetrating clamping through holes are provided in the axial direction. Each row includes at least two clamping through holes and are evenly distributed in the circumferential direction of the central tube. A clamping block is disposed in the clamping through hole, one end of which is located on the radial outer side of the central tube, and the other end of which extends into the radial inner side of the central tube for abutting against the rod passing through the central tube; and The elastic component is arranged outside the clamping block and applies a radially inward elastic force to the clamping block.

2. The bar clamping device according to claim 1, wherein: The clamp also includes a sleeve, which is sleeved on the outside of the central tube.

3. The rod clamping device according to claim 1 or 2, wherein: The elastic component includes: an O-ring or an annular spring, and the O-ring or the annular spring is sleeved on the outside of the clamping block.

4. The rod clamping device according to claim 3, wherein: An annular groove is arranged around the circumference of the central tube, and the O-ring or the annular spring is at least partially arranged in the annular groove.

5. The bar clamping device according to claim 2, wherein: The elastic component includes: a leaf spring or a compression spring, and the leaf spring or the compression spring is arranged between the inner wall of the sleeve and the clamping block.

6. The bar clamping device according to claim 2, wherein: The sleeve is provided with one or more water holes for liquid to enter or be discharged from the inner side of the sleeve.

7. The bar clamping device according to claim 2, wherein: The holder also includes: A first end cover, fixedly connected to the first end surface of the sleeve; The second end cover is fixedly connected to the second end face of the sleeve, wherein the second end face is opposite to the first end face, and the second end cover is positioned and connected to the end face of the mounting block.

8. The bar clamping device according to claim 1, wherein: An accommodating groove is provided on the axial side of the clamping through hole; the clamping block is provided with a pin shaft, and the pin shaft is arranged in the accommodating groove.

9. The bar clamping device according to claim 1, wherein: The mounting block is provided with a plurality of first countersunk holes penetrating in the radial direction for mounting the ultrasonic probe; a first wire passing groove is provided on the side of the first countersunk hole for the wire of the ultrasonic probe to pass through.

10. The bar clamping device according to claim 9, wherein: The mounting block includes 8-16 first countersunk holes evenly distributed along the circumferential direction. The first countersunk holes are arranged in two rows along the circumferential direction of the mounting block, and the two rows of first countersunk holes are staggered.

11. The bar clamping device according to claim 1, wherein: The mounting block is provided with one or two second countersunk holes coaxial with the mounting block for mounting the eddy current probe; a second wire groove is provided on the side of the second countersunk hole for the wire of the eddy current probe to pass through.

12. A bar material detection device, wherein: The bar material detection device comprises: The bar clamping device according to any one of claims 1 to 11, wherein the clamp of the bar clamping device is used to clamp the bar for positioning and centering; A plurality of ultrasonic probes mounted on a mounting block of the bar clamping device; At least one eddy current probe is mounted on the mounting block of the bar clamping device.

13. The bar material detection device according to claim 12, wherein: The mounting block of the rod clamping device is provided with a plurality of first countersunk holes penetrating in the radial direction, a first wire groove is opened on the side of the first countersunk hole, the ultrasonic probe is arranged in the first countersunk hole, and the line of the ultrasonic probe passes through the first wire groove; and / or, The mounting block is provided with one or two second countersunk holes coaxial with the mounting block, and a second wire groove is opened on the side of the second countersunk hole; the eddy current probe is arranged in the second countersunk hole, and the line of the eddy current probe passes through the second wire groove.

14. The bar material detection device according to claim 12 or 13, wherein: The bar material detection device also includes: One or two fixing plates, each fixing plate being provided with a plurality of positioning holes; The clamp comprises a first end cover, wherein the first end cover is provided with a positioning boss which cooperates with the positioning hole to positionally connect the clamp with the fixing plate.

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