A PCM natural gas pipeline anti-corrosion coating testing device and its working method

Abstract

This invention discloses a PCM natural gas pipeline anti-corrosion layer detection device and its working method, belonging to the technical field of pipeline detection components. It includes an "A" frame, which consists of a handheld crossbar, connecting rods, diagonal rods, and a detection rod. A cutting rod is connected to the detection rod via a limiting component, and the cutting rods are connected to each other via pressure rods. A water storage tray is installed on the handheld crossbar, and a trigger gate assembly is installed at the bottom of the water storage tray. The trigger gate assembly is connected to a drip box via a delivery pipe. A control handle is located at the center of the handheld crossbar, and the control handle is connected to a traction linkage rod via a linkage component. The traction linkage rod passes through the water storage tray and is connected to the trigger gate assembly. This invention is designed specifically for the "A" frame. When it is necessary to wet the ground, simply pressing the control handle will activate the water supply, which is then delivered to the ground via the detection rod and the cutting rod, effectively wetting the ground to be cut and facilitating subsequent cutting.

Description

Technical Field

[0001] This invention relates to the field of pipeline inspection components, and in particular to a PCM natural gas pipeline anti-corrosion coating inspection device and its working method. Background Technology

[0002] The RD-PCM+ (A-frame method) pipeline corrosion protection layer inspection method is a method that uses the principle of electromagnetic induction to determine and evaluate the defects and overall condition of the external corrosion protection layer of buried pipelines. During field measurement, a transmitter first applies a current signal to the pipeline under test. Then, a receiver detects the current value at different points along the pipeline on the ground. When the detection signal current is supplied from a certain point in the pipeline, the current flows along the pipeline and decreases regularly with increasing distance. When the corrosion protection layer is poor or defective, the current attenuates more rapidly. The current values ​​measured in the field are input into a computer, and the GDFFW software is used to calculate and analyze the change in the pipeline current attenuation rate. This allows for the determination of defects and corrosion in the corrosion protection layer, generating intuitive graphics and outputting relevant calculation results and graphs. Based on the processed data, the aging condition of the corrosion protection insulation layer in each section of the pipeline can be determined.

[0003] The PCM+ is used in conjunction with an AC ground potential difference measuring instrument (A-frame) to locate and accurately position the anti-corrosion layer of buried pipelines, based on AC attenuation detection. It is accurate, convenient, and does not require excavation. However, in practical applications, dry ground conditions have a significant impact on the accuracy of PCM detection. Often, an extra worker is needed to moisten the A-frame detection area during construction, which is a waste of manpower and resources. Furthermore, the current A-frame is inconvenient to use on some hard, gravelly surfaces due to the force applied by hand. Therefore, a new PCM anti-corrosion layer detection device for natural gas pipelines is proposed. Summary of the Invention

[0004] The purpose of this invention is to solve the problems existing in the prior art and to propose a PCM natural gas pipeline anti-corrosion layer detection device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A PCM natural gas pipeline anti-corrosion coating inspection device includes an "A" frame for use with an AC ground potential difference meter. The "A" frame consists of a handheld crossbar, a connecting rod, a diagonal rod, and a detection rod. A cutting rod is connected to the detection rod via a limiting component. Adjacent cutting rods are connected by a pressure rod. A water storage pan is provided on the handheld crossbar. A trigger gate assembly is provided at the bottom of the water storage pan. The trigger gate assembly is connected to a drip box via a delivery pipe. A control handle is provided at the center of the handheld crossbar. The control handle is connected to a traction linkage rod via a linkage component. The traction linkage rod extends into the water storage pan and is connected to the trigger gate assembly.

[0007] Preferably, the top of the detection rod is fixedly connected to the inclined rod, the end of the inclined rod is fixedly connected to the connecting rod, the two ends of the handheld crossbar are fixedly connected to the connecting rods on both sides respectively, and an overflow inclined block is provided at the bottom of the detection rod.

[0008] Preferably, the limiting component includes a rectangular limiting port opened on the detection rod, the insertion rod is fixedly connected to a limiting ring, the limiting ring is sleeved on the detection rod and fixedly connected to a rectangular stop block located in the rectangular limiting port, and the limiting ring is inclined to facilitate overflow.

[0009] Preferably, the bottom of the insertion rod is inclined and tapered, and an angle iron rod is provided between the pressure rod and the insertion rod.

[0010] Preferably, the trigger gate assembly includes a water outlet at the bottom of the water storage pan, a sealing seat at the water outlet, a support plate connected to the inner wall of the water storage pan by multiple support rods, a sealing rod slidably disposed on the support plate, a sealing ball adapted to the sealing seat fixedly connected to the end of the sealing rod, and a accumulator plate fixedly connected to the other end of the sealing rod, the accumulator plate being connected to the sealing seat by a accumulator spring sleeved on the sealing rod.

[0011] Preferably, the drip box is fixedly connected to the inclined rod, the bottom of the drip box is provided with a drip hole, one end of the delivery pipe is connected to the water outlet, the other end is connected to the drip box, and the delivery pipe is wound around the connecting rod.

[0012] Preferably, the linkage assembly includes a linkage cavity disposed within the handheld crossbar, the control handle is connected to a control column extending into the linkage cavity, a linkage support rod is rotatably connected to the end of the control column, the other end of the linkage support rod is rotatably connected to a traction linkage rod, and the other end of the traction linkage rod is rotatably connected to a power storage plate via a traction rod.

[0013] Preferably, the control handle is annularly sleeved on the handrail, and the control handle is connected to the handrail via a return spring sleeved on the control post.

[0014] Preferably, the water storage pan has a water inlet, and the water inlet is threaded with a sealing plug.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. This invention is designed for an "A"-shaped frame, which stores a certain amount of water in a water storage tray. When it is necessary to wet the ground, simply press the control handle to turn on the water. The water is then delivered to the ground at a fixed point through the detection rod and the cutting rod, effectively wetting the ground where cuttings need to be inserted, which facilitates subsequent cuttings insertion.

[0017] 2. This invention redesigns the "A" frame, transforming the original one-piece structure into a combined structure of the insertion rod and the detection rod. During insertion, the pressure of the body is used to achieve deep insertion of the insertion rod, thereby achieving a fast and effective insertion of the "A" frame for testing. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of a PCM natural gas pipeline anti-corrosion layer detection device proposed in this invention;

[0019] Figure 2 This is a schematic diagram of the main cross-sectional structure of a PCM natural gas pipeline anti-corrosion coating detection device proposed in this invention;

[0020] Figure 3 for Figure 2 Enlarged structural diagram at point A;

[0021] Figure 4 for Figure 2 Enlarged structural diagram at point B;

[0022] Figure 5 This is a front structural diagram of a PCM natural gas pipeline anti-corrosion layer detection device proposed in this invention;

[0023] Figure 6 This is a schematic diagram of the limiting component in a PCM natural gas pipeline anti-corrosion layer detection device proposed in this invention.

[0024] In the diagram: 1. Handheld horizontal bar; 2. Connecting rod; 3. Diagonal bar; 4. Detection rod; 5. Insertion rod; 6. Pressure rod; 7. Water storage pan; 8. Delivery pipe; 9. Drip box; 10. Control handle; 11. Traction linkage rod; 12. Overflow inclined block; 13. Rectangular limit port; 14. Limit ring; 15. Rectangular stop block; 16. Angle iron rod; 17. Sealing seat; 18. Support plate; 19. Sealing rod; 20. Sealing ball; 21. Energy storage plate; 22. Control column; 23. Linkage support rod; 24. Traction rod; 25. Sealing plug. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0026] Example

[0027] Reference Figure 1-6 A PCM natural gas pipeline anti-corrosion layer testing device includes an "A" frame used in conjunction with an AC ground potential difference meter. The "A" frame consists of a handheld horizontal bar 1, a connecting rod 2, an inclined bar 3, and a testing rod 4. The top of the testing rod 4 is fixedly connected to the inclined bar 3, and the end of the inclined bar 3 is fixedly connected to the connecting rod 2. The two ends of the handheld horizontal bar 1 are fixedly connected to the connecting rods 2 on both sides respectively. An overflow inclined block 12 is provided at the bottom of the testing rod 4.

[0028] It should be noted that when downward pressure is applied, the "A" frame will tilt to both sides. Therefore, this solution designs the "A" frame by using the design of the diagonal bar 3 to make the force more accurate during insertion and effectively avoid the bending of the "A" frame. The handheld crossbar 1, connecting bar 2, diagonal bar 3 and detection bar 4 are integrally formed.

[0029] The detection rod 4 is connected to the cutting rod 5 via a limiting component. Further, the limiting component includes a rectangular limiting port 13 opened on the detection rod 4. The cutting rod 5 is fixedly connected to a limiting ring 14. The limiting ring 14 is sleeved on the detection rod 4 and is fixedly connected to a rectangular stop 15 located in the rectangular limiting port 13. The limiting ring 14 is inclined to facilitate overflow. The inclined limiting ring 14 allows water flowing down on it to flow directly into the cutting rod 5, ensuring effective wetting of the ground to be cut.

[0030] The further advantage of adopting the above method is that the cutting rod 5 is limited to the detection rod 4 by the limiting ring 14. When the "A" frame is inserted into the ground, it is only necessary to step on the pressure rod 6 to allow the cutting rod 5 connected to the pressure rod 6 to be inserted into the ground. Compared with the existing method of inserting by hand, this can minimize the force used and make the cutting process more convenient.

[0031] Two adjacent cutting rods 5 are connected by a pressure rod 6. A water storage tray 7 is provided on the hand-held crossbar 1. The water storage tray 7 has a water inlet, and the water inlet is threaded with a sealing plug 25. The water inlet is designed to store water before testing. The bottom of the cutting rod 5 is set in an inclined cone shape. An angle iron rod 16 is provided between the pressure rod 6 and the cutting rod 5. The angle iron rod 16 makes the connection between the pressure rod 6 and the cutting rod 5 more secure.

[0032] A trigger gate assembly is provided at the bottom of the water storage pan 7. Further, the trigger gate assembly includes a water outlet opened at the bottom of the water storage pan 7, and a sealing seat 17 is provided at the water outlet. A support plate 18 is connected to the inner wall of the water storage pan 7 through multiple support rods. A sealing rod 19 is slidably arranged on the support plate 18. A sealing ball 20 adapted to the sealing seat 17 is fixedly connected to the end of the sealing rod 19. A power storage plate 21 is fixedly connected to the other end of the sealing rod 19. The power storage plate 21 is connected to the sealing seat 17 through a power storage spring sleeved on the sealing rod 19.

[0033] It is worth noting that the pressure applied by the storage spring to the storage plate 21 inward causes the sealing rod 19 to exert a certain pressure on the sealing ball 20 at all times, ensuring that the sealing ball 20 can always contact the sealing seat 17 when no external force is applied, thereby achieving the effect of sealing the outlet.

[0034] The trigger gate assembly is connected to the drip box 9 via the delivery pipe 8. The drip box 9 is fixedly connected to the inclined rod 3. The bottom of the drip box 9 is provided with a drip hole. One end of the delivery pipe 8 is connected to the water outlet, and the other end is connected to the drip box 9. The delivery pipe 8 is wound around the connecting rod 2.

[0035] A control handle 10 is provided at the center of the handrail 1. The control handle 10 is connected to a traction linkage rod 11 through a linkage component. The traction linkage rod 11 passes through the water storage pan 7 and is connected to the trigger gate component.

[0036] Furthermore, the linkage assembly includes a linkage cavity disposed within the handheld crossbar 1. The control handle 10 is connected to a control post 22 that extends through the linkage cavity. A linkage support rod 23 is rotatably connected to the end of the control post 22. The other end of the linkage support rod 23 is rotatably connected to the traction linkage rod 11. The other end of the traction linkage rod 11 is rotatably connected to the accumulator plate 21 via the traction rod 24. The control handle 10 is annularly sleeved on the handheld crossbar 1. The control handle 10 is connected to the handheld crossbar 1 via a return spring sleeved on the control post 22. The return spring is designed to apply upward pressure to the control handle 10 at all times, thereby achieving an automatic reset effect.

[0037] When using this AC ground potential difference meter to detect current, if the ground is relatively dry and it is not possible to effectively insert the cutting rod 5 into the ground, after clearly determining the position to be inserted, hold the control handle 10 set on the hand handle bar 1 and press the control handle 10 to move the control column 22 set inside it. When the control column 22 moves, it will cause the traction linkage rod 11 connected to it through the linkage support rod 23 to move horizontally. Under the action of the traction linkage rod 11, the energy storage plate 21 connected to it through the traction rod 24 will move upward. During the movement, the energy storage plate 21 will drive the sealing rod 19 to move the sealing ball 20. The sealing ball 20 will disengage from the sealing seat 17. During the disengagement process, the water outlet is opened, and the water stored in the water storage plate 7 is transported to the drip box 9 for storage through the delivery pipe 8.

[0038] The drip box 9 will gradually draw water along the detection rod 4 to the insertion rod 5, eventually contacting the ground that needs to be moistened, thus wetting the dry ground. After the ground is moistened, by stepping on the pressure rod 6, the pressure from the body will cause the insertion rod 5 to be inserted into the ground, thereby achieving the effect of quickly and effectively inserting the "A" frame for testing.

[0039] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A PCM natural gas pipeline anti-corrosion coating testing device, comprising an "A" frame used in conjunction with an AC ground potential difference meter, characterized in that, The "A" frame consists of a handheld horizontal bar (1), a connecting rod (2), a diagonal bar (3), and a detection rod (4). The detection rod (4) is connected to a cutting rod (5) via a limiting component. Two adjacent cutting rods (5) are connected by a pressure rod (6). A water storage tray (7) is provided on the handheld horizontal bar (1). A trigger gate assembly is provided at the bottom of the water storage tray (7). The trigger gate assembly is connected to a drip box (9) via a delivery pipe (8). A control handle (10) is provided at the center of the handheld horizontal bar (1). The control handle (10) is connected to a traction linkage rod (11) via a linkage component. The traction linkage rod (11) passes through the water storage tray (7) and is connected to the trigger gate assembly. The top of the detection rod (4) is fixedly connected to the inclined rod (3), the end of the inclined rod (3) is fixedly connected to the connecting rod (2), the two ends of the handheld horizontal bar (1) are fixedly connected to the connecting rods (2) on both sides respectively, and an overflow inclined block (12) is provided at the bottom of the detection rod (4). The limiting component includes a rectangular limiting port (13) opened on the detection rod (4), the insert rod (5) is fixedly connected to a limiting ring (14), the limiting ring (14) is sleeved on the detection rod (4) and is fixedly connected to a rectangular stop block (15) located in the rectangular limiting port (13), and the limiting ring (14) is inclined to facilitate overflow. The trigger gate assembly includes an outlet at the bottom of the water storage pan (7), a sealing seat (17) is provided at the outlet, a support plate (18) is connected to the inner wall of the water storage pan (7) by multiple support rods, a sealing rod (19) is slidably provided on the support plate (18), a sealing ball (20) adapted to the sealing seat (17) is fixedly connected to the end of the sealing rod (19), and a power storage plate (21) is fixedly connected to the other end of the sealing rod (19). The power storage plate (21) is connected to the sealing seat (17) by a power storage spring sleeved on the sealing rod (19). The drip box (9) is fixedly connected to the inclined rod (3). The drip box (9) has a drip hole at the bottom. One end of the conveying pipe (8) is connected to the water outlet, and the other end is connected to the drip box (9). The conveying pipe (8) is wound around the connecting rod (2). The linkage assembly includes a linkage cavity set in the handheld crossbar (1), the control handle (10) is connected to a control column (22) that extends into the linkage cavity, the end of the control column (22) is rotatably connected to a linkage support rod (23), the other end of the linkage support rod (23) is rotatably connected to a traction linkage rod (11), and the other end of the traction linkage rod (11) is rotatably connected to a power storage plate (21) through a traction rod (24); When using this AC ground potential difference meter to detect current, if the ground is too dry to effectively insert the cutting rod into the ground, after clearly determining the position to be inserted, press the control handle on the handle bar. This will move the control column inside the control column. When the control column moves, the traction linkage rod connected to it via the linkage rod will move horizontally. Under the action of the traction linkage rod, the storage plate connected to it via the traction rod will move upward. During the movement, the storage plate will drive the sealing rod to move the sealing ball. The sealing ball will disengage from the sealing seat, opening the water outlet. The water stored in the storage pan will then be transported to the drip box for storage through the delivery pipe. The drip box gradually directs water along the testing rod to the cutting rod, eventually contacting the ground that needs to be moistened. After the ground is moistened, the cutting rod is inserted into the ground by stepping on the pressure rod, thus achieving a fast and effective testing of the "A" frame cuttings.

2. The PCM natural gas pipeline anti-corrosion coating testing equipment according to claim 1, characterized in that, The bottom of the cutting rod (5) is set in an inclined conical shape, and an angle iron rod (16) is set between the pressure rod (6) and the cutting rod (5).

3. The PCM natural gas pipeline anti-corrosion coating testing equipment according to claim 1, characterized in that, The control handle (10) is a ring sleeved on the hand-held crossbar (1), and the control handle (10) is connected to the hand-held crossbar (1) through a reset spring sleeved on the control column (22).

4. The PCM natural gas pipeline anti-corrosion coating testing equipment according to claim 1, characterized in that, The water storage pan (7) is provided with a water inlet, and the water inlet is threadedly connected with a sealing plug (25).

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