Boiler tube plate flaw detection clamp

Abstract

The utility model discloses a boiler tube plate flaw detection clamp, and particularly relates to the technical field of boiler tube plate detection, the boiler tube plate flaw detection clamp comprises a base, the top of the base is provided with two supporting plates, the opposite sides of the two supporting plates are provided with concave blocks, the concave blocks are internally and movably provided with clamping plates, the tops of the clamping plates are provided with adjusting screw rods, and the adjusting screw rods are connected with the base. Guide rods are arranged on the two sides of the adjusting screw rod, an overturning structure is arranged at the position, corresponding to the supporting plate, of the concave block, the overturning structure comprises two rotating shafts, the two rotating shafts are fixedly installed on the outer wall of the corresponding concave block, the concave block is rotationally connected with the supporting plate through the rotating shafts, and a positioning disc is fixedly arranged at one end of one rotating shaft. When flaw detection is carried out on the boiler tube plate, tube plates with different diameters can be clamped, flaw detection operation can be conveniently carried out on the upper surface and the lower surface of the boiler tube plate, and the detection precision and the detection efficiency of the tube plate are improved.

Description

Technical Field

[0001] This utility model relates to the field of boiler tube sheet inspection technology, and more specifically, to a boiler tube sheet flaw detection fixture. Background Technology

[0002] Boiler tube sheets are key perforated plate components in boilers used to fix heat exchange tubes and separate media. Specifically, they are circular steel plates with holes slightly larger than the outer diameter of the heat exchange tubes formed by drilling, used to fix the heat exchange tubes and separate different media.

[0003] After the boiler tube sheet is manufactured, it needs to be subjected to internal flaw detection to ensure its service life. In order to improve the detection effect, the boiler tube sheet needs to be clamped by a fixture during flaw detection.

[0004] However, current fixtures can only hold boiler tube sheets and cannot flip them. When it is necessary to perform flaw detection on both sides of the boiler tube sheet, operators need to perform frequent clamping operations, which affects the detection efficiency. Therefore, this utility model proposes a boiler tube sheet flaw detection fixture. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a boiler tube sheet flaw detection fixture to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a boiler tube plate flaw detection fixture, comprising a base, two support plates on the top of the base, concave blocks on opposite sides of the two support plates, a clamping plate movably mounted inside the concave blocks, an adjusting screw on the top of the clamping plate, guide rods on both sides of the adjusting screw, the adjusting screw being threadedly connected to the concave blocks, one end of the guide rod being connected to the clamping plate and slidably connected to the concave blocks, and an anti-slip pad made of rubber being pasted on the lower surface of the clamping plate, the surface of the anti-slip pad being provided with anti-slip texture.

[0007] As can be seen, by placing the edge of the boiler tube plate inside the concave block and rotating the adjusting screw, the clamping plate can clamp the edge of the boiler. The anti-slip pad not only improves the anti-slip effect but also prevents scratches from being caused on the surface of the boiler tube plate.

[0008] To facilitate flaw detection on the upper and lower surfaces of the boiler tube sheet, reduce the burden of frequent clamping for operators, and improve flaw detection accuracy, preferably, a flipping structure is provided at the concave block and the corresponding support plate. The flipping structure includes two rotating shafts, both of which are fixedly installed on the outer wall of the corresponding concave block, and the concave block is rotatably connected to the support plate through the rotating shafts. A positioning plate is fixedly installed at one end of one rotating shaft, and several positioning holes are opened at the connection between the positioning plate and the support plate. Bolts are installed in the internal threads of the positioning holes. A first sprocket is fixedly installed at one end of the other rotating shaft, and a second sprocket is installed at the bottom of the first sprocket. A chain is meshed on the outer sides of the first sprocket and the second sprocket. A rotary motor is provided on the inner wall of the support plate and on the side opposite to the second sprocket. The rotary motor is fixedly installed on the inner wall of the support plate, and the output end of the motor is fixedly connected to the second sprocket.

[0009] To facilitate clamping and fixing tube sheets of different diameters, preferably, the surface of the base has two mounting slots. A bidirectional threaded screw is rotatably mounted inside one mounting slot, and a sliding rod is fixedly mounted inside the other mounting slot. Threaded blocks and sliders are respectively provided on the outside of the bidirectional threaded screw and the sliding rod. A servo motor is provided at one end of the screw. Two moving plates are provided on the surface of the base. The servo motor is fixed at one end of the base, and its output end is fixedly connected to the bidirectional threaded screw. The threaded block is threadedly connected to the bidirectional threaded screw, and the slider is slidably connected to the sliding rod. The threaded block and the slider are respectively fixedly mounted on the bottom of the corresponding moving plates, and the two moving plates are respectively fixedly mounted on the bottom of the corresponding support plates.

[0010] The technical effects and advantages of this utility model are as follows:

[0011] 1. By setting up a flipping structure, after the rotary motor is powered on, the output shaft drives the second sprocket to rotate. Through chain transmission, the first sprocket drives the concave block on one side to rotate through the rotating shaft. Since both sides of the tube sheet are clamped, the concave block on the other side passively follows the rotation through the opposite rotating shaft, realizing the overall flipping of the tube sheet. This facilitates the flaw detection operation on the upper and lower sides of the boiler tube sheet, improves the detection accuracy, and avoids the burden of frequent clamping for operators.

[0012] Screwing the bolts into the positioning holes corresponding to the positioning plate and the support plate can lock the position of the tube sheet after adjustment, preventing the fixture from shaking during flaw detection.

[0013] 2. A servo motor drives a bidirectional threaded screw to rotate inside the corresponding mounting slot, causing the two threaded blocks to move closer or further apart. This, in turn, drives the bottoms of the two moving plates to slide and be guided by two sliders outside the slide rod. The two moving plates moving closer or further apart drive the corresponding support plates to move, thereby adjusting the distance between the two support plates according to the diameter of the boiler tube plate. This facilitates clamping operations on boiler tube plates of different diameters and improves the operating range. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the connection structure between the threaded block and the slider and the corresponding movable plate of this utility model.

[0016] Figure 3 This is a schematic diagram of the connection structure between the concave block and the positioning plate of this utility model.

[0017] Figure 4 This is a schematic diagram of the connection structure between the concave block and the first sprocket of this utility model.

[0018] Figure 5 This is a schematic diagram of the connection structure between the anti-slip pad and the clamping plate of this utility model.

[0019] The attached diagram is labeled as follows: 1. Base; 2. Support plate; 3. Concave block; 4. Clamping plate; 5. Adjusting screw; 6. Guide rod; 7. Rotating shaft; 8. Positioning plate; 9. Positioning hole; 10. Bolt; 11. First sprocket; 12. Second sprocket; 13. Chain; 14. Rotary motor; 15. Mounting groove; 16. Bidirectional threaded screw; 17. Slide rod; 18. Threaded block; 19. Slider; 20. Servo motor; 21. Moving plate; 22. Anti-slip pad; 23. Anti-slip texture. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] As attached Figure 1-3The boiler tube sheet flaw detection fixture shown includes a base 1. Two support plates 2 are provided on the top of the base 1. A concave block 3 is provided on one side of each of the two support plates 2. A clamping plate 4 is movably installed inside the concave block 3. An adjusting screw 5 is provided on the top of the clamping plate 4. Guide rods 6 are provided on both sides of the adjusting screw 5. The adjusting screw 5 is threadedly connected to the concave block 3. One end of the guide rod 6 is connected to the clamping plate 4 and is slidably connected to the concave block 3. An anti-slip pad 22 is attached to the lower surface of the clamping plate 4. The anti-slip pad 22 is made of rubber and has anti-slip texture 23 on its surface.

[0022] Specifically, in this structure, the edge of the boiler tube plate is placed inside the concave block 3 and at the bottom of the anti-slip pad 22 of the clamping plate 4. The operator rotates the adjusting screw 5 to make the clamping plate 4 extend downward through the guide rod 6, clamping the edge of the boiler tube plate between the concave plate and the clamping plate 4, thereby completing the clamping and fixing operation during boiler tube plate flaw detection. The anti-slip pad 22 is provided with anti-slip texture 23, which not only improves the anti-slip effect but also avoids scratches on the surface of the boiler tube plate.

[0023] In this embodiment, as shown in the appendix Figure 1 , 3 As shown in Figure 4, a flipping structure is provided at the concave block 3 and the corresponding support plate 2. The flipping structure includes two rotating shafts 7, both of which are fixedly installed on the outer wall of the corresponding concave block 3. The concave block 3 is rotatably connected to the support plate 2 through the rotating shafts 7. A positioning disk 8 is fixedly provided at one end of one of the rotating shafts 7. Several positioning holes 9 are provided at the connection between the positioning disk 8 and the support plate 2. Bolts 10 are installed in the internal threads of the positioning holes 9. A first sprocket 11 is fixedly provided at one end of the other rotating shaft 7. A second sprocket 12 is provided at the bottom of the first sprocket 11. A chain 13 is meshed on the outside of the first sprocket 11 and the second sprocket 12. A rotary motor 14 is provided on the inner wall of the support plate 2 and on the side opposite to the second sprocket 12. The rotary motor 14 is fixedly installed on the inner wall of the support plate 2. The output end of the motor 14 is fixedly connected to the second sprocket 12.

[0024] Specifically, in this structure, after the upper surface of the boiler tube plate is clamped and fixed and flaw detection is completed, when the lower surface of the boiler tube plate needs to be flawed according to the actual situation, the rotary motor 14 is powered on and started, driving the second sprocket 12 to rotate. Under the action of the chain 13, the first sprocket 11 drives the corresponding concave block 3 to rotate through the rotating shaft 7. Since the edge of the boiler tube plate is clamped inside the two concave frames, when one concave block 3 rotates, it will drive the other concave block 3 to rotate through the rotating shaft 7 and the corresponding support plate 2, thereby enabling the boiler tube plate to be flipped so that the side that has not been flawed faces up, improving the accuracy of flaw detection.

[0025] When another concave block 3 rotates with the corresponding support plate 2 via the rotating shaft 7, it will drive the positioning plate 8 to rotate. After the boiler tube plate is flipped, the bolt 10 is threadedly connected to the positioning hole 9 at the positioning plate 8 and the support plate 2 to complete the positioning of the positioning plate 8, thereby positioning the flipped boiler tube plate and preventing it from flipping unnecessarily during flaw detection.

[0026] In this embodiment, as shown in the appendix Figure 1 , 2 As shown, the surface of the base 1 has two mounting slots 15. A bidirectional threaded screw 16 is rotatably mounted inside one mounting slot 15, and a slide rod 17 is fixedly mounted inside the other mounting slot 15. Threaded blocks 18 and sliders 19 are respectively provided on the outside of the bidirectional threaded screw 16 and the slide rod 17. A servo motor 20 is provided at one end of the screw. Two movable plates 21 are provided on the surface of the base 1. The servo motor 20 is fixed at one end of the base 1, and the output end of the servo motor 20 is fixedly connected to the bidirectional threaded screw 16. The threaded block 18 is threadedly connected to the bidirectional threaded screw 16, and the slider 19 is slidably connected to the slide rod 17. The threaded block 18 and the slider 19 are respectively fixedly mounted on the bottom of the corresponding movable plates 21, and the two movable plates 21 are respectively fixedly mounted on the bottom of the corresponding support plates 2.

[0027] Specifically, in this structure, the servo motor 20 can drive the bidirectional threaded screw 16 to rotate inside the corresponding mounting slot 15, causing the two threaded blocks 18 to move closer or further away from each other. This, in turn, drives the bottoms of the two moving plates 21 to slide and be guided by the two sliders 19 outside the slide rod 17. The two moving plates 21 moving closer or further away from each other drive the corresponding support plates 2 to move, thereby adjusting the distance between the two support plates 2 according to the diameter of the boiler tube plate. This facilitates clamping operations on boiler tube plates of different diameters and improves the operating range.

[0028] Working principle of this utility model:

[0029] This application provides a boiler tube sheet flaw detection fixture. In specific use, the distance between the two support plates 2 is first adjusted according to the diameter of the boiler tube sheet. After the servo motor 20 is powered on, it drives the bidirectional threaded screw 16 to rotate. Since the threads at both ends of the screw rotate in opposite directions, the threaded blocks 18 on both sides move closer or further away from each other as the bidirectional threaded screw 16 rotates. At the same time, the slider 19 on the other side slide rod 17 synchronously drives the corresponding moving plate 21 to slide, ensuring that the two support plates 2 move in parallel. Finally, the distance between the two support plates 2 matches the diameter of the boiler tube sheet to be inspected, preparing for subsequent clamping.

[0030] The edge of the boiler tube sheet is inserted into the opening of the concave block 3, so that the edge of the tube sheet is located below the anti-slip pad 22 at the bottom of the clamping plate 4. The operator manually rotates the adjusting screw 5, which is threaded into the concave block 3, causing the clamping plate 4 to move downward along the guide rod 6. The anti-slip pad 22 contacts the surface of the tube sheet, fixing the edge of the tube sheet through friction, while avoiding scratching the surface. Finally, the tube sheet is clamped between the concave block 3 and the clamping plate 4, completing the clamping and fixing before flaw detection.

[0031] After the boiler tube sheet is clamped and fixed, the probe of the ultrasonic or eddy current flaw detection equipment is aimed at the area to be inspected on the upper surface of the tube sheet. The upper surface of the tube sheet is inspected according to the predetermined inspection process, and the defect data is recorded. At this time, the tube sheet is kept horizontal, the upper surface is exposed within the inspection range, and the lower surface is blocked by the clamp.

[0032] When it is necessary to perform flaw detection on the lower surface of the boiler tube sheet, after the rotary motor 14 is powered on, the output shaft drives the second sprocket 12 to rotate, and the first sprocket 11 rotates synchronously through the chain 13. The first sprocket 11 drives the concave block 3 on one side to rotate through the rotating shaft 7. Since both sides of the tube sheet are clamped, the concave block 3 on the other side is passively rotated through the opposite rotating shaft 7, realizing the overall flipping of the tube sheet. After the flipping is in place, the operator screws the bolts 10 into the positioning holes 9 corresponding to the positioning plate 8 and the support plate 2 to lock the position of the rotating shaft 7 and prevent the fixture from shaking during flaw detection.

[0033] After the tube sheet is flipped over, the lower surface faces upward. The operator adjusts the probe position, aligns it with the new inspection area, and repeats the single-sided flaw detection process to conduct a comprehensive inspection of the lower surface of the tube sheet, ensuring that no defects on both sides are missed.

[0034] It is worth noting that all contents not described in detail in the specification are existing technologies known to those skilled in the art, and the model parameters of each electrical appliance are not specifically limited; conventional equipment can be used. Electrical control components not mentioned in this technical solution are existing technologies and are therefore not shown in the figures, nor will they be described here. All the equipment used above are conventional equipment available on the market.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A boiler tube sheet inspection fixture comprising a base (1) characterised in that: The base (1) has two support plates (2) on its top. Each of the two support plates (2) has a concave block (3) on one side opposite to the other. A clamping plate (4) is movably installed inside the concave block (3). An adjusting screw (5) is provided on the top of the clamping plate (4). Guide rods (6) are provided on both sides of the adjusting screw (5). A flipping structure is provided between the concave block (3) and the corresponding support plate (2). The flipping structure includes two rotating shafts (7), both of which are fixedly installed on the outer wall of the corresponding concave block (3), and the concave block (3) is rotatably connected to the support plate (2) through the rotating shafts (7). One end of one of the rotating shafts (7) is fixedly provided with a positioning plate (8). Several positioning holes (9) are provided at the connection between the positioning plate (8) and the support plate (2). Bolts (10) are installed in the internal threads of the positioning holes (9). One end of the other shaft (7) is fixedly provided with a first sprocket (11), and a second sprocket (12) is provided at the bottom of the first sprocket (11). The first sprocket (11) and the second sprocket (12) are meshed together with a chain (13). A rotary motor (14) is provided on the inner wall of the support plate (2) and on the side opposite to the second sprocket (12).

2. The boiler tube sheet inspection fixture of claim 1, wherein: The base (1) has two mounting slots (15) on its surface. A bidirectional threaded screw (16) is rotatably mounted inside one mounting slot (15), and a slide rod (17) is fixedly mounted inside the other mounting slot (15). Threaded blocks (18) and sliders (19) are respectively provided on the outside of the bidirectional threaded screw (16) and the slide rod (17). A servo motor (20) is provided at one end of the screw. Two movable plates (21) are provided on the surface of the base (1).

3. The boiler tube sheet inspection fixture of claim 2, wherein: The servo motor (20) is fixed at one end of the base (1), and the output end of the servo motor (20) is fixedly connected to the bidirectional threaded screw (16). The threaded block (18) is threadedly connected to the bidirectional threaded screw (16). The slider (19) is slidably connected to the slide rod (17). The threaded block (18) and the slider (19) are respectively fixedly installed at the bottom of the corresponding moving plate (21), and the two moving plates (21) are respectively fixedly installed at the bottom of the corresponding support plate (2).

4. The boiler tube sheet inspection fixture of claim 1, wherein: The adjusting screw (5) is threadedly connected to the concave block (3), one end of the guide rod (6) is connected to the clamping plate (4), and the guide rod (6) is slidably connected to the concave block (3).

5. The boiler tube sheet inspection fixture of claim 1, wherein: The lower surface of the clamping plate (4) is covered with an anti-slip pad (22), which is made of rubber and has anti-slip texture (23) on its surface.

6. The boiler tube sheet inspection fixture of claim 1, wherein: The rotary motor (14) is fixedly installed on the inner wall of the support plate (2), and the output end of the rotary motor (14) is fixedly connected to the second sprocket (12).

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