A clamping device for fixing a graphite member for non-destructive testing

Abstract

The utility model provides a kind of graphite component ray nondestructive testing fixed clamping device, including bearing table, clamping component and lifting assembly;Bearing table defines bearing surface;Clamping component is located below bearing surface, and including at least a pair of clamping jaw;Two clamping jaws in each pair of clamping jaw are configured to be opposite along the radial direction of bearing surface Mobile;Lifting assembly is configured to drive clamping component to move between non-working position and working position along vertical direction.The utility model is by setting liftable clamping component, can let clamping component switch between working position and non-working position, when working position, each pair of clamping jaw can reliably from radial clamping hold the workpiece on bearing surface, ensure that workpiece is stable during angle and position adjustment Process does not shift;In nondestructive testing stage, clamping component can be moved to non-working position, so that all clamping jaws are completely hidden below bearing surface, to eliminate the occlusion and interference of clamping component to ray path.

Description

Technical Field

[0001] This utility model relates to the field of radiation imaging system technology, and more specifically, to a clamping device for fixing graphite components for non-destructive testing by X-ray. Background Technology

[0002] The content in this section only provides background information related to this utility model and may not constitute prior art.

[0003] As an important functional and structural material in nuclear reactors, graphite components typically require non-destructive testing using radiation imaging systems.

[0004] Common radiation imaging systems can be found in the patent document with application number "CN202123347418.4" entitled "A Non-destructive Testing Device with Adjustable Magnification". In such systems, the graphite component under test is placed on a rotatable and movable stage to allow adjustment of the angle and position of the graphite component according to the testing requirements.

[0005] However, such systems do not have a structure to fix the graphite components on the stage. During the rotation or movement of the stage, there is a high risk that the graphite components may shift on the stage or even fall off the stage. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide a clamping device for fixing graphite components for radiographic nondestructive testing, so as to overcome the technical problem that the stage of the radiographic imaging system cannot fix the graphite components, and that the graphite components are at great risk of shifting on the stage or even falling off the stage.

[0007] The objective of this utility model is achieved through the following technical solution:

[0008] This utility model provides a clamping device for fixing graphite components for radiographic nondestructive testing, comprising:

[0009] The support platform defines the horizontal support surface;

[0010] A clamping assembly, disposed below the bearing surface, includes at least one pair of jaws; two of the jaws in each pair are configured to move radially relative to each other along the bearing surface to selectively clamp a workpiece on the bearing surface;

[0011] The lifting assembly is configured to drive the clamping assembly to move vertically between a non-working position and a working position;

[0012] In the non-working position, each of the grippers is completely below the bearing surface; in the working position, at least a portion of each of the grippers is above the bearing surface.

[0013] Optionally, the clamping assembly further includes:

[0014] The turntable can rotate about a reference axis; the reference axis is perpendicular to the line connecting two of the grippers in each pair of grippers and passes through the center of the line; the turntable is provided with arc-shaped slides that correspond to the grippers, and each gripper is provided with a sliding part that can slide within the corresponding arc-shaped slide;

[0015] A constraint structure is provided to ensure that each of the grippers can only move radially along the bearing surface.

[0016] Optionally, the constraint structure includes guide grooves that mate with each of the grippers; the guide grooves penetrate the bearing surface and extend radially along the bearing surface;

[0017] In the working position, at least a portion of the gripper is located within the corresponding guide groove and slides in engagement with the sidewall of the corresponding guide groove.

[0018] Optionally, the clamping assembly further includes:

[0019] Multiple guide members are sequentially and fixedly arranged along the circumference of the turntable; the guide members include:

[0020] Two rotatable guide wheels are arranged opposite each other in a vertical direction. The outer circumferential wall of one guide wheel contacts the upper surface of the turntable, and the outer circumferential wall of the other guide wheel contacts the lower surface of the turntable.

[0021] Optionally, the clamping assembly further includes:

[0022] A support plate is provided below the turntable; the output end of the lifting assembly is connected to the support plate;

[0023] A drive motor is mounted on the support plate and is connected to the turntable via a transmission.

[0024] Optionally, each of the grippers has a cushioning pad on its gripping surface.

[0025] Optionally, the cushioning pad is made of polyurethane.

[0026] Optionally, the support platform has a receiving cavity located below the support surface, and the clamping assembly and the lifting assembly are both housed in the receiving cavity.

[0027] Optionally, the support platform includes:

[0028] The outer shell defines the receiving cavity internally; both the upper and lower ends of the outer shell are open structures.

[0029] A top plate is provided at the upper end of the outer casing to seal the opening at the upper end of the outer casing; the top surface of the top plate serves as the bearing surface.

[0030] A base plate is detachably mounted on the lower end of the housing to seal the opening at the lower end of the housing; the lifting assembly is mounted on the base plate.

[0031] Optionally, the clamping device for fixing graphite components for radiographic nondestructive testing further includes:

[0032] A force detection component is configured to detect the clamping force when the grippers hold the workpiece.

[0033] The technical solution of this utility model embodiment has at least the following advantages and beneficial effects:

[0034] This invention features a height-adjustable clamping assembly that allows the assembly to switch between working and non-working positions. In the working position, each pair of jaws reliably grips the workpiece on the bearing surface radially, ensuring the workpiece remains stable and does not shift during angle and position adjustments. During the non-destructive testing stage, the clamping assembly can be moved to the non-working position, completely concealing all jaws beneath the bearing surface. This eliminates the clamping assembly's obstruction and interference with the X-ray path, providing a reliable guarantee for obtaining high-definition and high-accuracy non-destructive testing results. Attached Figure Description

[0035] Figure 1 A schematic diagram of the structure of a graphite component fixing clamping device for radiographic nondestructive testing provided in an embodiment of the present invention in one state; it shows the case when the clamping assembly is in a non-working position;

[0036] Figure 2 A schematic diagram of the structure of the graphite component nondestructive testing clamping device provided in an embodiment of the present invention in another state; it shows the situation when the clamping assembly is in the working position;

[0037] Figure 3 for Figure 2 A sectional view;

[0038] Figure 4 A schematic diagram of the structure of the support platform provided in an embodiment of this utility model;

[0039] Figure 5 A schematic diagram of the clamping assembly and lifting assembly provided in an embodiment of this utility model;

[0040] Figure 6 A schematic diagram of the turntable and grippers provided for an embodiment of this utility model;

[0041] Figure 7 forFigure 5 Enlarged view of the local structure at point A in the middle.

[0042] Icons: 10-Bearing platform, 11-Bearing surface, 12-Receiving cavity, 13-Outer shell, 14-Top plate, 15-Bottom plate, 20-Clamping assembly, 21-Gripper, 211-Sliding part, 22-Turntable, 221-Arc-shaped slide, 23-Guide groove, 24-Guide component, 241-Guide wheel, 25-Support plate, 26-Drive motor, 30-Lifting assembly. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments. The same reference numerals in the accompanying drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0044] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of protection of this utility model may have fewer components, have other components not shown in the drawings, different components, components with different arrangements, or components with different connections, etc. Furthermore, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0045] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar words as used in this specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "an" or "a," and similar words, do not necessarily indicate a limitation on quantity.

[0046] Example 1

[0047] Embodiment 1 of this utility model provides a clamping device for fixing graphite components for radiographic nondestructive testing. For ease of explanation, the clamping device for fixing graphite components for radiographic nondestructive testing provided in Embodiment 1 of this utility model will be referred to as the "clamping device" below.

[0048] Figure 1 and Figure 2 The diagrams illustrate the structure of the clamping device provided in Embodiment 1 of this utility model in two different states. Figure 3 for Figure 2 A sectional view.

[0049] like Figures 1 to 3 As shown, according to Embodiment 1 of this utility model, the clamping device may include a support platform 10, a clamping assembly 20, and a lifting assembly 30.

[0050] The support platform 10 may be generally cylindrical and define a horizontal support surface 11, which is suitable for supporting the workpiece to be inspected (not shown in the figure). Exemplarily, the top surface of the support platform 10 can be directly used as the support surface 11. The workpiece described in this embodiment of the invention may be a graphite component.

[0051] The clamping assembly 20 is disposed below the bearing surface 11 and includes at least one pair of jaws 21. Two jaws 21 in each pair are configured to move radially relative to each other along the bearing surface 11 to selectively clamp a workpiece on the bearing surface 11. For a single pair of jaws 21, the two jaws 21 clamp the workpiece from opposite sides. Exemplarily, the accompanying drawings of this invention illustrate a case comprising only one pair of jaws 21.

[0052] There are several ways to achieve relative movement between the two grippers 21. For example, one gripper 21 can be kept fixed while the other gripper 21 moves radially along the bearing surface 11; or, the two grippers 21 can move simultaneously towards or away from each other radially along the bearing surface 11. Compared to the first method, the second method is more efficient in clamping or releasing workpieces.

[0053] The lifting assembly 30 can be disposed below the clamping assembly 20. The lifting assembly 30 is configured to drive the clamping assembly 20 vertically in a certain direction. Figure 1 The non-working positions shown and as Figure 2 The gripper 21 moves between the indicated working positions. In the non-working position, each gripper 21 is completely below the bearing surface 11; in the working position, at least a portion of each gripper 21 is above the bearing surface 11.

[0054] According to Embodiment 1 of this utility model, the entire clamping device can be integrated into a known prior art radiation imaging system, specifically the radiation imaging system disclosed in patent document CN202123347418.4 entitled "A Non-destructive Testing Device with Adjustable Magnification". During integration, the support stage 10 can be directly fixed to the stage of the radiation imaging system using fasteners, replacing the stage in bearing the workpiece to be inspected, and allowing the support stage 10 to rotate or move under the drive of the stage.

[0055] In use, first allow the lifting assembly 30 to drive the clamping assembly 20 to move to the desired position. Figure 2The work position is shown so that a portion of each gripper 21 is above the bearing surface 11. The workpiece to be inspected can then be placed between the two grippers 21 of each pair of grippers 21. In this state, if it is necessary to adjust the angle or position of the workpiece by rotating or moving the stage, the two grippers 21 of each pair of grippers 21 should first be brought closer together radially along the bearing surface 11 to hold the workpiece, thereby preventing the workpiece from shifting or even falling off when adjusting its angle and position.

[0056] After the workpiece's angle or position is adjusted, the two jaws 21 of each pair of grippers 21 are moved radially away from each other along the bearing surface 11 to release the workpiece from clamping. Then, the lifting assembly 30 drives the clamping assembly 20 to move to the position shown in the image. Figure 1 The non-working position shown is such that each gripper 21 is completely below the bearing surface 11, thereby avoiding the presence of the gripper 21 from obstructing or interfering with the ray path during subsequent detection.

[0057] The clamping device provided in Embodiment 1 of this utility model, by setting up a liftable clamping component 20, allows the clamping component 20 to switch between a working position and a non-working position. In the working position, each pair of jaws 21 can reliably clamp the workpiece located on the bearing surface 11 from the radial direction, ensuring that the workpiece is stable and does not shift during the adjustment of angle and position. In the non-destructive testing stage, the clamping component 20 can be moved to the non-working position, so that all jaws 21 are completely hidden under the bearing surface 11, thereby eliminating the obstruction and interference of the clamping component 20 on the X-ray path, providing a reliable guarantee for obtaining high-definition and high-accuracy non-destructive testing results.

[0058] Meanwhile, the device has a compact structure and high integration, and can be directly adapted to the stage of existing radiation imaging systems. Relying on the clamping assembly 20 with lifting function, it can reliably clamp workpieces of various sizes, effectively expanding the applicability of the entire support device.

[0059] In some possible embodiments, the relative movement of the two jaws 21 in each pair of jaws 21 can be achieved, but is not limited to, in the manner described below.

[0060] Combination Figure 3 , Figure 5 and Figure 6 As shown, the clamping assembly 20 may further include a turntable 22 and a constraint structure. The turntable 22 is arranged below the bearing surface 11 and can rotate about a reference axis s. The reference axis s is perpendicular to the line connecting the two jaws 21 in each pair of jaws 21 and passes through the center of that line. This can also be understood as the two jaws 21 in each pair being symmetrically distributed about the reference axis s. The reference axis s can also be understood as the central axis of the bearing platform 10.

[0061] The turntable 22 is also provided with arc-shaped slides 221 that correspond to and cooperate with each gripper 21. The innermost side of each arc-shaped slide 221 is close to the center of the turntable 22, and the outermost side is close to the outer edge of the turntable 22. Each gripper 21 is provided with a sliding part 211 that can slide within the corresponding arc-shaped slide 221. The sliding part 211 can be a rotatable roller to minimize the friction when the sliding part 211 slides within the arc-shaped slide 221.

[0062] The constraint structure is used to ensure that each gripper 21 can only move radially along the bearing surface 11, that is, to ensure that each gripper 21 has only a degree of freedom in the radial direction of the bearing surface 11. Here, the radial direction of the bearing surface 11 can also be understood as the radial direction of the turntable 22.

[0063] Based on the above configuration, when the turntable 22 rotates, the sliding part 211 of each gripper 21 will slide relative to the turntable 22 in the corresponding arc-shaped slide rail 221. Since each gripper 21 can only move radially along the bearing surface 11 under the constraint of the constraint structure, the rotational motion of the turntable 22 will be transformed into the linear movement of the sliding part 211 along the radial direction of the bearing surface 11, thereby driving the gripper 21 to move linearly along the radial direction of the bearing surface 11 through the sliding part 211. For example, assuming that in the initial state, the sliding part 211 of each gripper 21 is located at the innermost side of the corresponding arc-shaped slide 221, when the turntable 22 rotates, the sliding part 211 of each gripper 21 will slide relative to the turntable 22 along the corresponding arc-shaped slide 221 toward the outermost side of the arc-shaped slide 221, so that each gripper 21 moves in a straight line along the radial direction of the bearing surface 11 away from the center of the turntable 22, thereby realizing the opposite movement of the two grippers 21 in each pair of grippers 21; conversely, when the turntable 22 rotates in the opposite direction, the sliding part 211 of each gripper 21 will slide relative to the turntable 22 along the corresponding arc-shaped slide 221 toward the innermost side of the arc-shaped slide 221, so that each gripper 21 moves in a straight line along the radial direction of the bearing surface 11 toward the center of the turntable 22, thereby realizing the opposite movement of the two grippers 21 in each pair of grippers 21.

[0064] This design not only allows the two jaws 21 in each pair of jaws 21 to move radially relative to each other along the bearing surface 11 to clamp or release the workpiece, but also helps to reduce the volume of the clamping assembly 20 in the radial direction of the bearing surface 11 and simplify the structure of the clamping assembly 20.

[0065] In some possible embodiments, combined Figure 3 or Figure 4 The constraint structure shown may specifically include guide grooves 23 that mate with each gripper 21. These guide grooves 23 penetrate the bearing surface 11 and extend radially along the bearing surface 11. When the clamping assembly 20 is in the working position, at least a portion of the gripper 21 is located within the corresponding guide groove 23 and slides against the sidewall of the corresponding guide groove 23.

[0066] By providing guide grooves 23 on the bearing surface 11 to constrain the degrees of freedom of each gripper 21, each gripper 21 can be positioned directly below the bearing surface 11 when the clamping assembly 20 is in a non-working position. This design further optimizes the structural design of the entire clamping device.

[0067] In some possible embodiments, combined Figure 5 and Figure 7 As shown, the clamping assembly 20 may further include multiple guide members 24. The multiple guide members 24 are sequentially and fixedly arranged around the periphery of the turntable 22 along its circumference. Each guide member 24 may include two rotatable guide wheels 241. The two guide wheels 241 are arranged opposite each other in a vertical direction, and the axis of each guide wheel 241 is perpendicular to the reference axis s. The circumferential outer wall of one guide wheel 241 contacts the upper surface of the turntable 22, and the circumferential outer wall of the other guide wheel 241 contacts the lower surface of the turntable 22.

[0068] With the setting of guide members 24, when the turntable 22 rotates around the reference axis s, the upper and lower surfaces of the turntable 22 are constrained by the two guide wheels 241 of each guide member 24, thereby preventing the turntable 22 from moving up and down or warping, and providing a reliable guarantee for the smooth rotation of the turntable 22.

[0069] In some possible embodiments, combined Figure 3 or Figure 5 As shown, the clamping assembly 20 may further include a support plate 25 and a drive motor 26. The support plate 25 is positioned below the turntable 22, and the output end of the lifting assembly 30 is connected to the support plate 25 to drive the support plate 25 to move vertically, thereby enabling the entire clamping assembly 20 to move vertically. For example, the lifting assembly 30 may be a conventional linear actuator such as a cylinder or electric actuator suitable for outputting linear reciprocating motion. When the output end of the lifting assembly 30 is connected to the support plate 25, multiple guide members 24 may be fixedly mounted on the support plate 25.

[0070] The drive motor 26 is mounted on the top surface of the support plate 25 and is connected to the turntable 22 for transmission, so as to drive the turntable 22 to rotate around the reference axis s through the drive motor 26.

[0071] In some possible embodiments, a buffer pad (not shown in the figure) may also be provided on the clamping surface of each gripper 21. The clamping surface of the gripper 21 refers to the side of the gripper 21 that contacts the workpiece when clamping it. The buffer pad helps protect the workpiece and minimizes the risk of damage to the workpiece when clamped by the gripper 21.

[0072] The buffer pad can be made of polyurethane. This buffer pad can adapt well to the slight unevenness of the graphite component surface and effectively disperse the clamping force to prevent the jaws 21 from crushing the edge or surface of the workpiece.

[0073] In some possible embodiments, such as Figure 3 As shown, the support platform 10 also has a receiving cavity 12 located below the support surface 11. The clamping assembly 20 and the lifting assembly 30 are both housed within the receiving cavity 12. This design provides reliable protection for the clamping assembly 20 and the lifting assembly 30, while also improving the aesthetics of the clamping device.

[0074] Furthermore, the support platform 10 having a bearing surface 11 and a receiving cavity 12 can be constructed, but is not limited to, in the manner described below.

[0075] Combination Figure 3 and Figure 4 As shown, the support platform 10 may also include a housing 13, a top plate 14, and a bottom plate 15. The housing 13 may be a hollow cylindrical structure to define a receiving cavity 12 inside the housing 13. Furthermore, both the upper and lower ends of the housing 13 are open structures.

[0076] A top plate 14 is detachably mounted on the upper end of the housing 13 to seal the opening at the upper end of the housing 13. The top surface of the top plate 14 can serve as a bearing surface 11. A bottom plate 15 is detachably mounted on the lower end of the housing 13 to seal the opening at the lower end of the housing 13. A lifting assembly 30 can be mounted on the bottom plate 15.

[0077] This design facilitates maintenance and repair of the clamping assembly 20 and / or the lifting assembly 30 as needed. Specifically, the lifting assembly 30, along with the clamping assembly 20, can be removed from the housing 13 through the opening at the lower end of the housing 13 simply by removing the base plate 15, making the operation simple and convenient.

[0078] Furthermore, referring to Figure 3 As shown, the inner diameter of the outer shell 13 can match the inner diameter of the support plate 25 of the clamping assembly 20, and the circumferential outer wall of the support plate 25 slides with the inner wall of the outer shell 13 so that the outer shell 13 can limit and guide the support plate 25, thereby ensuring the stability of the support plate 25 and even the entire clamping assembly 20 when moving in the vertical direction.

[0079] Example 2

[0080] Based on Embodiment 1, Embodiment 2 of this utility model provides another clamping device for fixing graphite components for radiographic nondestructive testing. Unlike Embodiment 1, the clamping device provided in Embodiment 2 may further include a force detection component (not shown in the figure). The force detection component is configured to detect the clamping force when the gripper 21 clamps the workpiece, thereby achieving real-time monitoring of the clamping force.

[0081] The force detection component can be communicatively connected to a radiation imaging system or a separately configured controller. This allows the force detection component to send the detected pressure signal corresponding to the clamping force to the controller. In this case, the controller can also be communicatively connected to the drive motor 26 of the clamping assembly 20 described in Embodiment 1, so that the controller can control the drive motor 26 to operate according to the pressure signal, thereby maintaining the clamping force applied to the workpiece by the gripper 21 within a preset range.

[0082] This design facilitates precise control of the clamping force, thereby further reducing the risk of workpiece damage when the gripper 21 clamps the workpiece.

[0083] The force detection component can be a thin-film pressure sensor installed on the clamping surface of each gripper 21. This not only facilitates its placement on the clamping surface of the gripper 21, but also helps to improve the accuracy of the detected clamping force.

[0084] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A clamping device for fixing graphite components for non-destructive testing by X-ray, characterized in that, include: The support platform defines the horizontal support surface; A clamping assembly is disposed below the bearing surface and includes at least one pair of grippers; Two of the grippers in each pair are configured to move radially relative to each other along the bearing surface to selectively grip a workpiece on the bearing surface; The lifting assembly is configured to drive the clamping assembly to move vertically between a non-working position and a working position; In the non-working position, each of the grippers is completely below the bearing surface; in the working position, at least a portion of each of the grippers is above the bearing surface.

2. The clamping device for fixing graphite components for radiographic nondestructive testing according to claim 1, characterized in that, The clamping assembly further includes: The turntable can rotate about a reference axis; the reference axis is perpendicular to the line connecting two of the grippers in each pair of grippers and passes through the center of the line; the turntable is provided with arc-shaped slides that correspond to the grippers, and each gripper is provided with a sliding part that can slide within the corresponding arc-shaped slide; A constraint structure is provided to ensure that each of the grippers can only move radially along the bearing surface.

3. The clamping device for fixing graphite components for radiographic nondestructive testing according to claim 2, characterized in that, The constraint structure includes guide grooves that correspond to and cooperate with each of the grippers; the guide grooves penetrate the bearing surface and extend radially along the bearing surface; In the working position, at least a portion of the gripper is located within the corresponding guide groove and slides in engagement with the sidewall of the corresponding guide groove.

4. The clamping device for fixing graphite components for radiographic nondestructive testing according to claim 2, characterized in that, The clamping assembly further includes: Multiple guide members are sequentially and fixedly arranged along the circumference of the turntable; the guide members include: Two rotatable guide wheels are arranged opposite each other in a vertical direction. The outer circumferential wall of one guide wheel contacts the upper surface of the turntable, and the outer circumferential wall of the other guide wheel contacts the lower surface of the turntable.

5. The clamping device for fixing graphite components for radiographic nondestructive testing according to claim 2, characterized in that, The clamping assembly further includes: A support plate is provided below the turntable; the output end of the lifting assembly is connected to the support plate; A drive motor is mounted on the support plate and is connected to the turntable via a transmission.

6. The clamping device for fixing graphite components for radiographic nondestructive testing according to claim 1, characterized in that, Each of the grippers has a buffer pad on its gripping surface.

7. The clamping device for fixing graphite components for radiographic nondestructive testing according to claim 6, characterized in that, The cushioning pad is made of polyurethane.

8. The clamping device for fixing graphite components for radiographic nondestructive testing according to claim 1, characterized in that, The support platform has a receiving cavity located below the support surface, and the clamping assembly and the lifting assembly are both housed in the receiving cavity.

9. The clamping device for fixing graphite components for radiographic nondestructive testing according to claim 8, characterized in that, The support platform includes: The outer shell defines the receiving cavity internally; both the upper and lower ends of the outer shell are open structures. A top plate is provided at the upper end of the outer casing to seal the opening at the upper end of the outer casing; the top surface of the top plate serves as the bearing surface. A base plate is detachably mounted on the lower end of the housing to seal the opening at the lower end of the housing; the lifting assembly is mounted on the base plate.

10. The clamping device for fixing graphite components for radiographic nondestructive testing according to claim 1, characterized in that, Also includes: A force detection component is configured to detect the clamping force when the grippers hold the workpiece.

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