A bimetallic composite pipe capable of detecting the thickness of the wear-resistant layer

Abstract

This utility model discloses a bimetallic composite pipe capable of detecting the thickness of a wear-resistant layer, relating to the field of bimetallic composite pipe technology. It includes a protective layer and a wear-resistant layer, with the wear-resistant layer disposed on the inner wall of the protective layer. The bimetallic composite pipe is available in two types: straight and curved. A pair of detection holes are formed on the protective layer of the straight pipe within a range of 1.5 times its diameter from the end. On the protective layer of the curved pipe, a detection hole is formed radially corresponding to its outer diameter. The detection holes penetrate the protective layer to the outer wall of the wear-resistant layer. A sleeve is radially inserted into each detection hole and welded to the protective layer. This utility model allows for direct detection from a small exposed area of ​​the wear-resistant layer by machining detection holes at designated positions on the protective layer, eliminating the need for machine shutdown and disassembly. This greatly simplifies the detection process, saves significant time, improves production efficiency, and reduces labor intensity.

Description

Technical Field

[0001] This utility model relates to the field of bimetallic composite pipe technology, specifically a bimetallic composite pipe capable of detecting the thickness of the wear-resistant layer. Background Technology

[0002] In industries such as mining and metallurgy, pipeline systems for transporting highly abrasive materials are among the key infrastructure components. To extend pipeline service life, bimetallic composite wear-resistant pipes have become widely used. These composite pipes are typically made by combining an outer structural protective layer (usually ordinary carbon steel) and an inner wear-resistant layer (usually high-chromium cast iron, ceramic composite metal, or other materials with extremely high hardness) through processes such as centrifugal casting, resulting in a combination of high mechanical strength and excellent wear resistance.

[0003] During long-term use, the wear-resistant layer on the inner wall of bimetallic composite pipes will continuously wear down and thin due to the constant erosion of materials. When the wear-resistant layer thickness wears down below a critical value, the material will quickly wear through the inner wear-resistant layer and begin to erode the outer structural layer, posing a safety hazard. Therefore, regular inspection and condition monitoring of the wear-resistant layer thickness are crucial for ensuring safe production and enabling preventative maintenance and planned replacement.

[0004] Currently, the mainstream method for testing the wear-resistant layer thickness of bimetallic composite pipes in the industry is as follows: First, the conveying operation needs to be stopped at the joint of the pipe to be tested. Then, the flange or pipe joint is disassembled to expose the inside of the pipe. Finally, the operator inserts the probe of an ultrasonic thickness gauge into the inside of the pipe to manually measure multiple points of the wear-resistant layer on the inner wall. (It should be noted that due to the physical interface and acoustic impedance difference between the two metal layers of the bimetallic composite pipe, when using a conventional ultrasonic thickness gauge from the outside, the sound waves cannot effectively penetrate and clearly distinguish the echo of the inner wear-resistant layer. Therefore, it is impossible to achieve non-destructive thickness measurement of the inner wear-resistant layer from the outside of the pipe.)

[0005] However, existing testing methods are labor-intensive, cumbersome to operate, and have complex processes, consuming a lot of manpower and time, which reduces production efficiency and operational benefits. Utility Model Content

[0006] To address the aforementioned shortcomings of existing technologies, this utility model provides a bimetallic composite pipe capable of detecting the thickness of the wear-resistant layer. By machining detection holes at designated locations on the protective layer, detection can be performed directly from a small exposed area of ​​the wear-resistant layer, eliminating the need for machine shutdown and disassembly. This greatly simplifies the detection process, saves significant time, improves production efficiency, and reduces the labor intensity of personnel.

[0007] To achieve the above objectives, this utility model is implemented through the following technical solution: a bimetallic composite pipe capable of detecting the thickness of a wear-resistant layer, comprising a protective layer and a wear-resistant layer, wherein the wear-resistant layer is disposed on the inner sidewall of the protective layer; the bimetallic composite pipe is divided into straight pipe and bent pipe; a pair of detection holes are formed on the protective layer of the straight pipe within a range of 1.5 times the diameter at the end; a detection hole is formed radially on the protective layer of the bent pipe at a position corresponding to the outer diameter; the detection holes penetrate the protective layer to the outer sidewall of the wear-resistant layer; a sleeve is radially inserted into the detection hole and welded to the protective layer; the inner diameter of the sleeve is capable of inserting a probe of an ultrasonic metal thickness gauge; the inner sidewall of the sleeve is provided with internal threads and a screw is screwed onto it through the internal threads; the pair of detection holes on the straight pipe are vertically aligned on the protective layer.

[0008] Preferably, a pair of detection holes are radially provided on the protective layer of the bend at the position corresponding to the outer diameter, and the pair of detection holes are respectively located within a range of 1.5 times the diameter at the end.

[0009] Preferably, a detection hole is radially formed on the protective layer of the bent pipe at a position corresponding to the center of the outer diameter.

[0010] Preferably, the sleeve and screw are provided with a rubber sleeve.

[0011] Preferably, a rubber gasket is provided between the screw and the sleeve.

[0012] Preferably, the outer diameter of the sleeve is 27mm, the inner diameter is 17mm, and the protective layer protrudes by 10mm.

[0013] Preferably, the protective layer is a seamless steel pipe, and the wear-resistant layer is a high-chromium alloy centrifugally cast.

[0014] This invention provides a bimetallic composite tube capable of detecting the thickness of the wear-resistant layer, which has the following advantages: 1. This utility model allows for direct inspection from a small exposed area of ​​the wear-resistant layer by machining inspection holes at designated locations on the protective layer, eliminating the need for machine shutdown and disassembly. This greatly simplifies the inspection process, saves a significant amount of time, improves production efficiency, and reduces the labor intensity of personnel. 2. The tube sleeve and screw of this utility model are provided with a hemispherical rubber sleeve, which reduces the damage to the tube sleeve in the event of mechanical impact, and also prevents water and impurities from entering the detection hole. Attached Figure Description

[0015] Figure 1 This is a left cross-sectional view of a bimetallic composite pipe capable of detecting the thickness of a wear-resistant layer according to this utility model. Figure 2 This utility model Figure 1 A magnified view of a portion of the image; Figure 3 This is a front cross-sectional view of a bimetallic composite pipe capable of detecting the thickness of a wear-resistant layer according to this utility model. Figure 4 This is a front cross-sectional view of a detection hole provided on a bend in the pipe of this utility model. Figure 5 This is a front cross-sectional view of a pair of detection holes provided on the curved pipe in this utility model.

[0016] In the diagram: 1. Protective layer; 2. Wear-resistant layer; 3. Inspection hole; 4. Pipe sleeve; 5. Screw; 6. Rubber sleeve; 7. Internal thread; 8. Rubber gasket; 9. Straight pipe; 10. Bend. Detailed Implementation

[0017] 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.

[0018] like Figure 1-5 As shown, a bimetallic composite pipe capable of detecting the thickness of a wear-resistant layer 2 includes a protective layer 1 and a wear-resistant layer 2. The wear-resistant layer 2 is disposed on the inner wall of the protective layer 1. The bimetallic composite pipe is divided into two types: a straight pipe 9 and a bent pipe 10. A pair of detection holes 3 are formed on the protective layer 1 of the straight pipe 9 within a range of 1.5 times the diameter at the end. A detection hole 3 is formed radially on the protective layer 1 of the bent pipe 10 at a position corresponding to the outer diameter. The detection holes 3 penetrate the protective layer 1 to the outer wall of the wear-resistant layer 2. A sleeve 4 is radially inserted into the detection hole 3 and welded to the protective layer 1. The inner diameter of the sleeve 4 is large enough to insert the probe of an ultrasonic metal thickness gauge. An inner diameter is formed on the inner wall of the sleeve 4. A screw 5 is screwed onto the straight pipe 9 via an internal thread 7; a pair of inspection holes 3 on the straight pipe 9 are correspondingly positioned vertically on the protective layer 1; a pair of inspection holes 3 are radially opened on the protective layer 1 of the bent pipe 10 at the corresponding outer diameter position, and the pair of inspection holes 3 are respectively located within a range of 1.5 times the diameter at the end; a inspection hole 3 is radially opened on the protective layer 1 of the bent pipe 10 at the corresponding outer diameter center position; a rubber sleeve 6 is provided on the outside of the sleeve 4 and the screw 5; a rubber gasket 8 is provided between the screw 5 and the sleeve 4; the outer diameter of the sleeve 4 is 27mm, the inner diameter is 17mm, and it protrudes 110mm from the protective layer; the protective layer 1 is a seamless steel pipe, and the wear-resistant layer 2 is a high-chromium alloy centrifugally cast.

[0019] Its detailed connection methods are well-known technologies in this field. The following mainly introduces the working principle and process, as follows: According to the instruction manual Figure 1-5 It is understood that when using this utility model, personnel only need to unscrew screw 5 to expose the wear-resistant layer 2 at the detection hole 3, insert the probe of the ultrasonic metal thickness gauge into the detection hole 3 to the wear-resistant layer 2, and perform a thickness test on the wear-resistant layer 2. This allows for the calculation of the wear amount and determination of whether pipe replacement is necessary. In the detection of straight pipe 9, the detection hole 3 is located within a range of 1.5 times the diameter of the end. This end is also the connection point between straight pipe 9 and another pipe section. If the outer diameter of the protective layer 1 is D, then the end face is taken as point 0, and the detection hole 3 is set within a range of 1.5D. On the one hand, the stability of the pipe connection is worse than that of the pipe body, and the wear is also greater, so measuring at this point is the most accurate. On the other hand, because it is close to the connection point, once the detection result indicates that pipe replacement is necessary, personnel can directly carry out disassembly work, improving work efficiency. The pair of inspection holes 3 on the straight pipe 9 are aligned vertically on the protective layer 1. This is because, in actual use, due to gravity, the bottom experiences greater wear from the material. Therefore, to save costs, when the bottom wears to a certain extent while the top wears less and does not affect use, the straight pipe 9 is rotated 180 degrees axially, i.e., the bottom becomes the top and the top becomes the bottom. This is the purpose of the vertically aligned inspection holes 3. In the bent pipe 10, due to material impact, the inspection holes 3 are generally placed at the outer diameter where wear is greater. After inspection, screws 5 are tightened to prevent leakage caused by the wear-resistant layer 2 at the inspection hole 3 location being worn away under special circumstances. This invention, by machining inspection holes 3 at designated positions on the protective layer 1, allows for direct inspection from a small exposed area of ​​the wear-resistant layer 2, eliminating the need for machine shutdown and disassembly. This greatly simplifies the inspection process, saves significant time, improves production efficiency, and reduces labor intensity.

[0020] The wear on different parts of the outer diameter of the bend 10 will vary depending on the type of material, the flow rate, and the angle of the bend 10. The appropriate method should be chosen based on actual conditions and experience. In practical use, one situation is that the material inlet of the bend 10 experiences greater wear, while the outlet side experiences less wear. Figure 5 As shown, to save costs, when the feed position wears to a certain extent while the discharge position wears less and does not affect use, personnel will convert the discharge position into the feed position and the feed position into the discharge position to extend service life and save costs. This is the purpose of opening inspection holes 3 on the protective layer 1 of the bend 10 on both sides corresponding to the outer diameter. Similarly, when the wear at the center position is greater, such as... Figure 4 As shown, a detection hole 3 can be radially opened on the protective layer 1 of the bend 10 at a position corresponding to the center of the outer diameter.

[0021] The sleeve 4 and screw 5 are both equipped with rubber sleeves 6, which reduce damage to the sleeve 4 in the event of mechanical impact and prevent water or impurities from entering the detection hole 3. In addition, a rubber gasket 8 is provided between the screw 5 and the sleeve 4 to ensure the screw 5 seals the detection hole 3.

[0022] One possible implementation for the sleeve 4 is that the outer diameter of the sleeve 4 is 27mm, the inner diameter is 17mm, and the protective layer protrudes by 110mm. This specification meets the requirements for the insertion of the probe of the ultrasonic metal thickness gauge, and the diameter of the detection hole 3 is also relatively small, so it will not affect the use.

[0023] Among them, the protective layer 1 is a seamless steel pipe, which can provide a solid foundation support for the pipeline, and the wear-resistant layer 2 is a high-chromium alloy centrifugal casting with extremely high wear resistance, ensuring durability under harsh working conditions.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bimetallic composite pipe in which the thickness of a detectable wear layer (2) is characterized by, The bimetallic composite pipe includes a protective layer (1) and a wear-resistant layer (2). The wear-resistant layer (2) is disposed on the inner wall of the protective layer (1). The bimetallic composite pipe is divided into two types: straight pipe (9) and bent pipe (10). A pair of detection holes (3) are provided on the protective layer (1) of the straight pipe (9) within a range of 1.5 times the diameter at the end. A detection hole (3) is provided radially on the protective layer (1) of the bent pipe (10) at the position corresponding to the outer diameter. The detection hole (3) penetrates the protective layer (1) to the outer wall of the wear-resistant layer (2). A sleeve (4) is radially inserted into the detection hole (3) and welded to the protective layer (1). The inner diameter of the sleeve (4) can be inserted into the probe of the ultrasonic metal thickness gauge. An internal thread (7) is provided on the inner wall of the sleeve (4) and a screw (5) is screwed on through the internal thread (7). The pair of detection holes (3) on the straight pipe (9) are vertically corresponding on the protective layer (1).

2. The dual metal composite pipe of claim 1, wherein, A pair of detection holes (3) are radially opened on the protective layer (1) of the bend (10) at the corresponding outer diameter position. The pair of detection holes (3) are respectively located within a range of 1.5 times the diameter at the end.

3. The dual metal composite pipe of claim 1, wherein the detectable wear layer (2) has a thickness of 0.1 to 0.5 mm. A detection hole (3) is radially opened on the protective layer (1) of the bend (10) at the position corresponding to the center of the outer diameter.

4. The dual metal composite pipe of claim 1, wherein the detectable wear layer (2) has a thickness of 0.1 to 0.5 mm. The sleeve (4) and screw (5) are provided with rubber sleeves (6).

5. The dual metal composite pipe of claim 1 wherein, A rubber gasket (8) is provided between the screw (5) and the sleeve (4).

6. The dual metal composite pipe of claim 1 wherein, The outer diameter of the sleeve (4) is 27 mm, the inner diameter is 17 mm, and it protrudes 10 mm from the protective layer (1).

7. The dual metal composite pipe of claim 1 wherein, The protective layer (1) is a seamless steel pipe, and the wear-resistant layer (2) is a high-chromium alloy centrifugally cast.

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