A special tool for boiler pipeline pigging test

Abstract

This utility model relates to a special tool for ball-passing tests on boiler pipes, including a ball, a connecting rod, and a driving device. The bottom end of the connecting rod is connected to the ball, and the tail end of the connecting rod is connected to the driving device. The surface of the ball has a polished layer. This structure solves the problem of existing ball-passing tests using compressed air to blow a steel ball through the pipe, where the ball falls into a header and cannot be retrieved. Furthermore, when defects such as inward bulging of the weld seam inside the pipe prevent the ball-passing test from being performed, it is usually necessary to replace the pipe or re-weld where the steel ball cannot pass, a process that is time-consuming and costly.

Description

Technical Field

[0001] This utility model relates to the field of boiler pipe ball-passing test technology, specifically to a special tool for boiler pipe ball-passing tests. Background Technology

[0002] During the maintenance of thermal power plants, it is often necessary to replace the pipes connected to the headers. After the maintenance is completed, a ball-passing test is required to check whether the inner diameter of the pipes has been affected by processing, welding, or assembly. The diameter of the steel ball is selected according to standard specifications. Due to structural reasons, the pipes connected to the headers are usually tested with a ball before installation. After installation, to prevent the steel ball from falling into the header, the ball-passing test is no longer performed, leaving a potential hazard.

[0003] Especially for large-scale pipelines with long pipe runs, numerous right-angle bends, and junctions with headers, checking for foreign objects inside the pipes can effectively shorten inspection time, eliminate potential risks during construction, ensure pipe cleanliness, and prevent pipe bursts caused by foreign object blockage. Current ball-passing tests for heated surfaces commonly use steel balls to confirm the absence of foreign objects, suitable for open pipelines with short pipe runs and few right-angle bends. For pipelines with long pipe runs and numerous right-angle bends, the steel ball cannot pass through the entire pipeline, making foreign object checking and removal impossible, and there is a risk of the steel ball becoming stuck inside the pipe. Current ball-passing tests use compressed air to blow the steel ball through the pipeline; when pipes connected to headers are involved, the steel ball may fall into the header and become impossible to remove. When defects such as inward-protruding welds inside the pipe prevent the ball-passing test from being performed, it is usually necessary to replace the pipe or re-weld where the steel ball cannot pass, a process that is time-consuming and costly. Utility Model Content

[0004] This invention provides a special tool for ball-passing tests on boiler pipelines, solving the problem that existing ball-passing tests use compressed air to blow a steel ball through the inside of the pipeline, resulting in the steel ball falling into the header and becoming impossible to remove. When defects such as inward bulging of the weld seam inside the pipeline prevent the ball-passing test from being performed, it is usually necessary to replace the pipeline or re-weld where the steel ball cannot pass, which is time-consuming and costly.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0006] A special tool for ball-passing tests on boiler pipes includes a ball, a connecting rod, and a driving device. The bottom end of the connecting rod is connected to the ball, and the tail end of the connecting rod is connected to the driving device. The surface of the ball has a polished layer.

[0007] The beneficial effects of this invention are that by connecting the ball to the bottom of the connecting rod, the steel ball is prevented from falling into the header and becoming impossible to remove. By creating a polished layer on the surface of the ball, when the ball detects a foreign object in the pipe, a drive device is activated, which rotates the connecting rod, causing the ball to rotate simultaneously. This allows the polished layer on the ball's surface to grind and polish the foreign object in the pipe until the ball can pass through. This avoids replacing the pipe or re-welding, reducing process time and pipe replacement costs.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, the polished layer has multiple protrusions.

[0010] The beneficial effect of adopting the above-mentioned further solution is that the polishing layer is set as multiple protrusions and evenly or irregularly distributed on the surface of the sphere. This gives the polishing layer a higher polishing ability.

[0011] Furthermore, the sphere is made of a quenched and hardened alloy.

[0012] The advantages of adopting the above-mentioned further solution are that the ball is made of cemented carbide and hardened by quenching. This increases the hardness of the ball and the grinding layer, giving the grinding layer higher grinding capability. It also reduces the frequency of ball replacement and lowers costs.

[0013] Furthermore, the outer diameter of the sphere is adapted to the boiler pipe, and the sphere is fixedly connected to the connecting rod.

[0014] The beneficial effect of adopting the above-mentioned further solution is that it fixes the ball to the connecting rod, making the connection between the ball and the connecting rod more secure, preventing the ball from separating from the connecting rod during rotary grinding due to the torque being greater than the connection force between the ball and the connecting rod, and preventing the ball from falling into the pipe and being unable to be removed.

[0015] Furthermore, the connecting rod is a telescopic rod.

[0016] The advantage of adopting the above-mentioned further solution is that by setting the connecting rod as a telescopic rod, the length of the connecting rod can be adjusted according to the length of the pipeline.

[0017] Furthermore, the tail end of the connecting rod has a square structure and a connecting hole is provided at the tail end of the connecting rod.

[0018] The advantage of adopting the above-mentioned further solution is that by machining the tail end of the connecting rod into a square shape, it can be directly connected to and locked to the drive device. Alternatively, it can be connected to and locked to the drive device through a connecting hole. This allows different drive devices to be selected to drive the connecting rod according to needs or environment, reducing the cost of manufacturing the ball-passing tool.

[0019] Furthermore, an internal thread is provided in the connecting hole, and the internal thread is threadedly connected to the output end of the drive device.

[0020] The advantage of adopting the above-mentioned further solution is that the connecting hole has an internal thread, allowing for the selection and locking of a drive device with a screw at the output end. This enables the selection of different drive devices to drive the connecting rod according to needs or environment, reducing the cost of manufacturing the ball-passing tool.

[0021] Furthermore, the square structure at the end of the connecting rod is adapted to connect with the drive device.

[0022] The beneficial effect of adopting the above-mentioned further solution is that the square-shaped outer surface of the connecting rod end is adapted to the drive device, and the drive device can adjust the size of the connection port of the drive device connector according to the thickness of the connecting rod end, so that the connection between the drive device and the connecting rod is more stable.

[0023] Furthermore, the connecting rod is made of metal.

[0024] The advantage of adopting the above-mentioned further solution is that the diameter of the connecting rod is selected to be smaller, so that the connecting rod has a certain degree of flexibility, which allows the connecting rod to adapt to the ball-passing test inspection of the curved pipe.

[0025] Furthermore, the driving device is an electric drill or a motor.

[0026] The advantage of adopting the above-mentioned further solution is that the driving device is an electric drill or a motor, and different driving devices can be selected to drive the connecting rod according to needs or environment, thereby reducing the cost of manufacturing ball-passing tools. Attached Figure Description

[0027] Figure 1 This is a cross-sectional view of the threaded assembly of a telescopic connecting rod of a special tool for ball passing tests in boiler pipelines according to this utility model.

[0028] Figure 2 This is a schematic diagram of the structure of a special tool for ball-passing tests in boiler pipes according to this utility model when used for pipe-passing;

[0029] Figure 3 This is a schematic diagram of the structure of a square-shaped connecting rod with telescopic function assembled into a special tool for ball-passing tests of boiler pipes according to this utility model.

[0030] Figure 4 This is a cross-sectional view of another structure of the connecting rod of the special tool for ball passing test of boiler pipe according to this utility model during thread assembly;

[0031] Figure 5 This is a schematic diagram of the square-shaped connecting rod of a special tool for ball-passing tests in boiler pipelines according to this utility model;

[0032] Figure 6 for Figure 4 A magnified view of part A in the image.

[0033] The components represented by each number in the attached diagram are listed below: 1. Sphere; 11. Polished layer; 2. Connecting rod; 21. Connecting hole; 3. Drive device. Detailed Implementation

[0034] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0035] Example 1

[0036] like Figure 1-6 As shown, a special tool for ball-passing tests of boiler pipes includes a ball 1, a connecting rod 2, and a driving device 3. The bottom end of the connecting rod 2 is connected to the ball 1, and the tail end of the connecting rod 2 is connected to the driving device 3. The surface of the ball 1 has a polishing layer 11.

[0037] Specifically, ball 1 is connected to the bottom end of connecting rod 2. In this embodiment, ball 1 is welded to the bottom end of connecting rod 2. Holding the drive device 3 connected to the tail end of connecting rod 2, insert the end with the welded ball 1 into the pipe. When ball 1 detects a foreign object in the pipe, drive device 3 is activated, causing connecting rod 2 to rotate, which in turn causes ball 1 to rotate. The polishing layer 11 on the surface of ball 1 rotates and polishes the foreign object in the pipe until ball 1 can pass through.

[0038] like Figure 1-6 As shown, the polished layer 11 has multiple protrusions.

[0039] Specifically, in this embodiment, the protrusions on the polishing layer 11 are configured as diamond-shaped protrusions or have a frosted friction surface. In this embodiment, coarse abrasive is selected, giving the polishing layer 11 a high polishing capability.

[0040] The shapes of the multiple protrusions can be square, rectangle, triangle, rhombus, oval, and circle, etc.

[0041] like Figure 1-6 As shown, sphere 1 is made of cemented carbide and hardened by quenching.

[0042] Specifically, the sphere 1 is made of cemented carbide and hardened by quenching. This increases the hardness of the sphere 1 and the polishing layer 11, giving the polishing layer 11 higher grinding capability. This reduces the frequency of replacing the sphere 1, lowering costs. In this embodiment, the sphere 1 is made of steel; alternatively, the sphere 1 can be made of other harder alloys.

[0043] like Figure 1-6 As shown, the outer diameter of the sphere 1 is adapted to the boiler pipe, and the sphere 1 is fixedly connected to the connecting rod 2.

[0044] Specifically, select a suitable ball 1 according to the diameter of the pipe, weld the ball 1 to the bottom of the connecting rod 2, and then insert the end of the connecting rod 2 with the ball 1 into the pipe.

[0045] like Figure 1-6 As shown, the tail end of the connecting rod 2 has a square structure, and a connecting hole 21 is provided at the tail end of the connecting rod 2.

[0046] Specifically, the tail end of the connecting rod 2 is machined into a square shape, allowing it to be directly connected to and locked to the drive device 3. Alternatively, it can be connected to and locked to the drive device 3 through the connecting hole 21. Different drive devices 3 can be selected to drive the connecting rod 2 according to needs or environment, reducing the cost of manufacturing the ball-passing tool.

[0047] like Figure 1-6 As shown, the connecting hole 21 has an internal thread, which can be threaded to the output end of the drive device 3.

[0048] Specifically, the connecting hole 21 has an internal thread, allowing for connection and locking of the output end with a screw drive device 3. In this embodiment, the drive device 3 can be a drive motor, with its output end locked to the internal thread in the connecting hole 21. Alternatively, the drive device 3 can be any other power tool with a threaded connection at its output end.

[0049] like Figure 1-6 As shown, the connecting rod 2 is made of metal.

[0050] Specifically, the connecting rod 2 is made of steel with a diameter of less than 5mm. The smaller diameter of the connecting rod 2 provides it with a degree of flexibility, allowing it to withstand ball-passing tests on curved pipes. In this embodiment, the connecting rod 2 can be made of steel rod, steel wire, steel wire rope, spring, etc. Alternatively, the connecting rod 2 can also be made of iron or other alloy rods.

[0051] like Figure 1-6 As shown, the drive device 3 is an electric drill or a motor.

[0052] Specifically, in this embodiment, the drive device 3 can be selected as a drive motor, and the output end of the drive motor is locked and connected to the internal thread in the connection hole 21. Alternatively, the drive device 3 can also be selected from other power tools with threaded connection function at the output end.

[0053] The beneficial effects of this embodiment are: connecting the ball 1 to the bottom of the connecting rod 2 prevents the steel ball from falling into the header and becoming impossible to remove. By setting the surface of the ball 1 as a polished layer 11, when the ball 1 detects a foreign object in the pipe, the drive device 3 is activated, which drives the connecting rod 2 to rotate, causing the connecting rod 2 to simultaneously rotate the ball 1. This allows the polished layer 11 on the surface of the ball 1 to rotate and polish the foreign object in the pipe until the ball can pass through. This avoids replacing the pipe or re-welding, reducing process time and pipe replacement costs.

[0054] The working process of this embodiment is as follows: Select a connecting rod 2 that is longer than the pipe, based on the pipe's length. Select a ball 1 that fits the pipe and weld the ball 1 to the bottom end of the connecting rod 2. Hold the drive device 3 connected to the tail end of the connecting rod 2 and insert the end with the welded ball 1 into the pipe. When the ball 1 detects a foreign object in the pipe, activate the drive device 3, which drives the connecting rod 2 to rotate, and in turn, the ball 1 to rotate. The polishing layer 11 on the surface of the ball 1 rotates and polishes the foreign object in the pipe until the ball 1 can pass through.

[0055] Example 2

[0056] The difference between this embodiment and Embodiment 1 is:

[0057] like Figure 1-6 As shown, the square structure at the end of the connecting rod 2 is adapted to and connected to the drive device 3.

[0058] Specifically, in this embodiment, the drive device 3 can be an electric drill. The tail end of the connecting rod 2 is inserted into the connector of the electric drill, and then the connector is rotated to lock the connecting rod 2 to the electric drill. Alternatively, the drive device 3 can also be other power tools with an adjustable connector size at the output end.

[0059] In this embodiment, the diameter of the connecting rod 2 is selected from steel bars, steel wires, steel wire ropes, springs, etc., with a diameter less than 5mm. A square structure at the tail end of the connecting rod 2 is selected to match the size of the connection opening of the electric drill head.

[0060] The beneficial effects of this embodiment are: connecting the ball 1 to the bottom of the connecting rod 2 prevents the steel ball from falling into the header and becoming impossible to remove. By setting the surface of the ball 1 as a polished layer 11, when the ball 1 detects a foreign object in the pipe, the drive device 3 is activated, which drives the connecting rod 2 to rotate, causing the connecting rod 2 to simultaneously rotate the ball 1. This allows the polished layer 11 on the surface of the ball 1 to rotate and polish the foreign object in the pipe until the ball 1 can pass through. This avoids replacing the pipe or re-welding, reducing process time and pipe replacement costs.

[0061] The working process of this embodiment is as follows: Select a connecting rod 2 that is longer than the pipe, based on the pipe's length. Select a ball 1 that fits the pipe and weld the ball 1 to the bottom end of the connecting rod 2. Hold the drive device 3 connected to the tail end of the connecting rod 2 and insert the end with the welded ball 1 into the pipe. When the ball 1 detects a foreign object in the pipe, activate the drive device 3, which drives the connecting rod 2 to rotate, and in turn, the ball 1 to rotate. The polishing layer 11 on the surface of the ball 1 rotates and polishes the foreign object in the pipe until the ball 1 can pass through.

[0062] Example 3

[0063] The difference between this embodiment and Embodiment 1 is:

[0064] like Figure 1-6 As shown, connecting rod 2 is a telescopic rod.

[0065] Specifically, the length of connecting rod 2 is adjusted according to the length of the pipe, so that the tail end of connecting rod 2 is higher than the top of the pipe, until the length of connecting rod 2 is greater than the length of the pipe.

[0066] The beneficial effects of this embodiment are: connecting the ball 1 to the bottom of the connecting rod 2 prevents the steel ball from falling into the header and becoming impossible to remove. By setting the surface of the ball 1 as a polished layer 11, when the ball 1 detects a foreign object in the pipe, the drive device 3 is activated, which drives the connecting rod 2 to rotate, causing the connecting rod 2 to simultaneously rotate the ball 1. This allows the polished layer 11 on the surface of the ball 1 to rotate and polish the foreign object in the pipe until the ball 1 can pass through. This avoids replacing the pipe or re-welding, reducing process time and pipe replacement costs.

[0067] The working process of this embodiment is as follows: Select a connecting rod 2 that is longer than the pipe, based on the pipe's length. Select a ball 1 that fits the pipe and weld the ball 1 to the bottom end of the connecting rod 2. Hold the drive device 3 connected to the tail end of the connecting rod 2 and insert the end with the welded ball 1 into the pipe. When the ball 1 detects a foreign object in the pipe, activate the drive device 3, which drives the connecting rod 2 to rotate, and in turn, the ball 1 to rotate. The polishing layer 11 on the surface of the ball 1 rotates and polishes the foreign object in the pipe until the ball 1 can pass through.

[0068] Example 4

[0069] The difference between this embodiment and embodiment 3 is:

[0070] like Figure 1-6 As shown, the square structure at the end of the connecting rod 2 is adapted to and connected to the drive device 3.

[0071] Specifically, in this embodiment, the drive device 3 can be an electric drill. The tail end of the connecting rod 2 is inserted into the connector of the electric drill, and then the connector is rotated to lock the connecting rod 2 to the electric drill. Alternatively, the drive device 3 can also be other power tools with an adjustable connector size at the output end. In this embodiment, the diameter of the connecting rod 2 is selected as a steel rod with a diameter of less than 5mm, and a square structure at the tail end of the connecting rod 2 is selected according to the size of the connector of the electric drill connector.

[0072] The beneficial effects of this embodiment are: connecting the ball 1 to the bottom of the connecting rod 2 prevents the steel ball from falling into the header and becoming impossible to remove. By setting the surface of the ball 1 as a polished layer 11, when the ball 1 detects a foreign object in the pipe, the drive device 3 is activated, which drives the connecting rod 2 to rotate, causing the connecting rod 2 to simultaneously rotate the ball 1. This allows the polished layer 11 on the surface of the ball 1 to rotate and polish the foreign object in the pipe until the ball can pass through. This avoids replacing the pipe or re-welding, reducing process time and pipe replacement costs.

[0073] The working process of this embodiment is as follows: Select a connecting rod 2 that is longer than the pipe, based on the pipe's length. Select a ball 1 that fits the pipe and weld the ball 1 to the bottom end of the connecting rod 2. Hold the drive device 3 connected to the tail end of the connecting rod 2 and insert the end with the welded ball 1 into the pipe. When the ball 1 detects a foreign object in the pipe, activate the drive device 3, which drives the connecting rod 2 to rotate, and in turn, the ball 1 to rotate. The polishing layer 11 on the surface of the ball 1 rotates and polishes the foreign object in the pipe until the ball 1 can pass through.

[0074] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0075] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0076] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0077] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0078] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0079] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A special tool for ball-passing tests on boiler pipes, characterized in that, It includes a ball (1), a connecting rod (2) and a driving device (3). The bottom end of the connecting rod (2) is connected to the ball (1), and the tail end of the connecting rod (2) is connected to the driving device (3). The tail end of the connecting rod (2) is higher than the top of the pipe to be tested. The surface of the ball (1) has a polishing layer (11).

2. The special tool for ball-passing tests on boiler pipes according to claim 1, characterized in that, The polished layer (11) has multiple protrusions.

3. A special tool for ball-passing tests on boiler pipes according to claim 2, characterized in that, The sphere (1) is made of a quenched and hardened alloy.

4. A special tool for ball-passing tests on boiler pipes according to claim 3, characterized in that, The outer diameter of the sphere (1) is adapted to the boiler pipe, and the sphere (1) is fixedly connected to the connecting rod (2).

5. A special tool for ball-passing tests on boiler pipes according to claim 1, characterized in that, The connecting rod (2) is a telescopic rod.

6. A special tool for ball-passing tests on boiler pipes according to claim 5, characterized in that, The tail end of the connecting rod (2) has a square structure, and a connecting hole (21) is provided at the tail end of the connecting rod (2).

7. A special tool for ball-passing tests on boiler pipes according to claim 6, characterized in that, The connecting hole (21) is provided with an internal thread, which is threaded to the output end of the driving device (3).

8. A special tool for ball-passing tests on boiler pipes according to claim 6, characterized in that, The square structure at the tail end of the connecting rod (2) is adapted to be connected to the driving device (3).

9. A special tool for ball-passing tests on boiler pipes according to claim 1, characterized in that, The connecting rod (2) is made of metal.

10. A special tool for ball-passing tests on boiler pipes according to claim 1, characterized in that, The drive device (3) is an electric drill or a motor.

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