A device for detecting a thermal barrier coating of a drill pipe

Abstract

This utility model discloses a test device for thermal insulation coatings on drill rods, relating to the technical field of coating testing equipment. It includes a test chamber with a flame gun and a thermometer mounted on its inner wall. The flame gun heats the drill rod to be tested, and the thermometer detects the surface temperature of the drill rod. A tensioning assembly is telescopically mounted on the top surface of the test chamber's inner cavity, extending into the inner cavity of the drill rod and tightening it securely. A clamping assembly is rotatably mounted on the bottom surface of the test chamber's inner cavity, allowing the drill rod to be clamped inside. The clamping assembly tightly holds the outer wall of the drill rod and includes a tension sensor to detect the stress on the surface of the drill rod. This test device for thermal insulation coatings on drill rods solves the technical problem of existing thermal insulation coating testing equipment providing only partial results and being unable to detect the actual performance of thermal insulation coatings under the influence of multiple external forces such as tension and torsion.

Description

Technical Field

[0001] This utility model relates to the technical field of coating testing equipment, and in particular to a testing device for thermal insulation coatings on drill pipes. Background Technology

[0002] The thermal insulation coating testing device for insulated drill pipes is a specialized device for evaluating the performance of thermal insulation coatings on drill pipe surfaces. It is primarily used in oil and geothermal drilling to ensure the insulation effect, durability, and adhesion of the coating under high temperature and pressure environments. While CN220854722U discloses a fire-retardant coating thermal insulation performance testing device for detecting product coating thickness, in actual drilling operations, the adhesion between the coating and the drill pipe substrate is equally crucial for ensuring stable and reliable thermal insulation capabilities. However, this patent cannot effectively measure coating adhesion, making performance evaluation difficult and resulting in biased test results that fail to reflect the actual performance of the thermal insulation coating. Furthermore, because drill pipes are subjected to multi-directional external forces such as tension, torsion, and vibration during operation, insufficient coating adhesion can lead to peeling, cracking, or delamination under continuous external forces, causing a decrease in the drill pipe's thermal insulation performance and potentially even safety accidents.

[0003] In conclusion, developing a testing device capable of detecting coating performance under conditions where drill pipes are subjected to multiple external forces is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of this invention is to provide a test device for thermal insulation coatings on drill pipes, which solves the technical problem that existing thermal insulation coating test equipment provides one-sided test results and cannot test the performance of thermal insulation coatings under the influence of multiple external forces such as tension and torsion.

[0005] To achieve the above objectives, this utility model provides a drill pipe heat insulation coating testing device, comprising:

[0006] Preferably, the test chamber has a flame gun and a thermometer installed on its inner wall. The flame gun is used to heat the drill rod to be tested, and the thermometer is used to detect the surface temperature of the drill rod to be tested.

[0007] The tensioning component is telescopically located on the top surface of the inner cavity of the test chamber. The tensioning component can extend into the inner cavity of the drill rod to be tested and be tensioned and fixed with the drill rod to be tested.

[0008] The clamping assembly is rotatably located on the bottom surface of the inner cavity of the test box. The drill rod to be tested can be clamped inside the clamping assembly. The clamping assembly is used to tightly clamp the outer wall of the drill rod to be tested. The clamping assembly is equipped with a tension sensor, which is used to detect the stress on the surface of the drill rod to be tested.

[0009] Preferably, the tensioning assembly includes a drive rod, with a mounting base coaxially connected to one end of the drive rod near the clamping assembly. The mounting base is connected to the insert rod via a connecting plate. Limiting plates are evenly distributed around the outer periphery of the insert rod, with the length of the limiting plates being less than the length of the insert rod. A transmission rod is hinged between the end of each limiting plate and the connecting plate. Several first guide rods are provided at one end of the insert rod near the connecting plate. The first guide rods are slidably disposed within the connecting plate and the mounting base. Several second guide rods are connected between the insert rod and the limiting plates, and each second guide rod can slide within the insert rod.

[0010] Preferably, the clamping assembly includes a rotating seat, the inner cavity of which is equipped with a driving cylinder. A rotating cylinder is fixed on the side end face of the rotating seat near the tensioning assembly. Several telescopic rods are threaded through the side wall of the rotating cylinder. An air cylinder is connected between the telescopic rods and the driving cylinder. The driving cylinder blows or draws air into the air cylinder to control the movement of the telescopic rods. A clamping plate is connected to the end of the telescopic rod away from the driving cylinder. The clamping plate can fit against the outer wall of the drill rod to be tested. A cover plate is provided on the outer periphery of the rotating cylinder. A positioning protrusion is provided on the end of the cover plate away from the driving cylinder. The positioning protrusion can mate with the inner cavity of the drill rod to be tested.

[0011] Preferably, a drive gear tooth is fixed on the inner cavity sidewall of the rotating seat, the drive gear tooth meshes with the gear, the gear is coaxially connected to the output shaft of the drive component, and the drive component is fixed to the external ground.

[0012] Preferably, a first elastic element is connected between the insert rod and the connecting plate. The first elastic element is located within the area enclosed by each first guide rod and is coaxially arranged with the insert rod. A second elastic element is provided on the outer periphery of the air cylinder. The second elastic element is used to push against the telescopic rod.

[0013] Preferably, friction blocks are provided on both the inner wall of the clamping plate and the outer wall of the limiting plate.

[0014] Preferably, the side wall of the testing box is connected to an opening and closing plate, which is used to open the inner cavity of the testing box, and an observation window is provided on the opening and closing plate.

[0015] Preferably, a control box is connected to the outer wall of the testing box. The control box is connected to the flame gun and the thermometer via signal. The control box is equipped with a control panel for controlling the flame gun and the thermometer.

[0016] Preferably, each first guide rod is parallel to the axis of the insertion rod, the axis of the second guide rod is perpendicular to the insertion rod and is arranged radially on the outer periphery of the insertion rod, and the extension and retraction direction of each telescopic rod is parallel to the axis of the second guide rod.

[0017] Compared to the aforementioned background technology, the drill rod heat insulation coating testing device provided by this utility model includes: a testing box for placing the drill rod to be tested; a blowtorch and a thermometer are provided on the inner side wall of the testing box; a tensioning component is provided on the top surface of the inner cavity of the testing box; the tensioning component can extend and retract along its own axis; the tensioning component can extend into the inner cavity of the drill rod to be tested and tighten inside the drill rod, with the inner and outer walls of the two tightly fitted together, fixing the tensioning component to the drill rod to be tested; a clamping component is rotatably provided on the bottom surface of the inner cavity of the testing box; the clamping component can be located on the outer periphery of the drill rod to be tested; when the drill rod to be tested extends into the clamping component, the clamping component tightens and tightly fits against the outer wall of the drill rod to be tested; when performing actual performance testing of the heat insulation coating according to this application, the clamping component, the tensioning component, and the drill rod to be tested are fixedly connected, and then the tensioning component is controlled to apply pressure along the drill rod to be tested. The tensile force along its axial direction and the clamping assembly apply circumferential torque to the drill rod under test. Simultaneously, the drill rod is subjected to high-temperature treatment by a flame gun, and the surface temperature of the drill rod is monitored in real time by a thermometer. This application simulates the situation where the drill rod is subjected to multiple external forces in actual use by setting tension and clamping assemblies for clamping and fixing on the inner and outer sides of the drill rod under test, and applying axial tensile force and circumferential torque to the drill rod through both. The actual heat insulation performance of the heat insulation coating under the influence of multiple external forces is accurately detected by the thermometer and tension sensor, making the test results more comprehensive. Furthermore, this application uses internal tension fixing and external clamping fixing to fasten the inner and outer walls of the drill rod under test. Both fastening methods can flexibly adapt to the inner and outer diameters of various models of drill rods under test, making this utility model more widely applicable. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 This is a structural diagram of the drill pipe heat insulation coating testing device provided in an embodiment of the present utility model;

[0020] Figure 2 This is a structural diagram of the drill rod heat insulation coating testing device for the hidden test box provided in this embodiment of the utility model;

[0021] Figure 3 This is a structural diagram of the tensioning assembly provided in an embodiment of the present utility model;

[0022] Figure 4 This is a structural diagram of the clamping component provided in an embodiment of the present utility model;

[0023] Figure 5 This is a cross-sectional view of the clamping component provided in an embodiment of the present utility model.

[0024] Among them, 1-test box; 11-opening plate; 12-control box; 2-flame gun; 3-thermometer; 4-tensioning assembly; 41-drive rod; 42-mounting base; 43-connecting plate; 44-insertion rod; 45-limiting plate; 46-first guide rod; 47-second guide rod; 48-transmission rod; 5-clamping assembly; 51-rotating seat; 52-drive cylinder; 53-rotating cylinder; 54-air cylinder; 55-telescopic rod; 56-clamping plate; 57-cover plate; 58-positioning protrusion; 59-drive wheel tooth; 6-drill rod to be tested; 7-drive component; 8-first elastic component; 9-second elastic component. Detailed Implementation

[0025] 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.

[0026] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] This utility model provides a device for testing the thermal insulation coating of drill pipes. Please refer to the appendix of the instruction manual. Figures 1 to 3The device includes a testing box 1 for placing the drill rod 6 to be tested and supporting the other components. A tensioning assembly 4 is connected to the top surface of the inner cavity of the testing box 1. The tensioning assembly 4 can extend and retract along the height direction of the testing box 1. In addition, a clamping assembly 5 is provided on the bottom surface of the inner cavity of the testing box 1. The clamping assembly 5 is coaxially arranged with the tensioning assembly 4 and can rotate around its own axis. The drill rod 6 to be tested is fixed to the tensioning assembly 4 by the clamping assembly 5. The clamping assembly 5 is located on the outer periphery of the drill rod 6 to be tested. When the clamping assembly 5 contracts, it fits tightly against the outer wall of the drill rod 6 to be tested. The clamping assembly 5 is equipped with a stress sensor for detecting the stress on the surface of the drill rod 6 to be tested. The tensioning component 4 extends into the inner cavity of the drill rod 6 to be tested and is tightened within the inner cavity of the drill rod 6. The outer wall of the tensioning component 4 is tightly fitted with the inner wall of the drill rod 6 to be tested, thereby fixing both the inner and outer sides of the drill rod 6 to be tested. A thermometer 3 and a flame gun 2 are provided on the inner wall of the testing box 1. The flame gun 2 performs high-temperature treatment on the drill rod 6 to simulate a high-temperature working environment for the drill rod 6 to be tested. The thermometer 3 is provided on the upper and lower sides of the flame gun 2. The thermometer 3 is used to detect the surface temperature of the drill rod 6 to be tested in real time. It should be noted that the drill rod is often in a high-temperature and high-pressure environment during drilling operations. In order to ensure the stable and reliable load-bearing capacity of the drill rod, a heat-insulating coating needs to be applied to the outer surface of the drill rod. In the performance testing of the drill rod 6 under test according to this application, the drill rod 6 under test is placed inside the clamping assembly 5 and positioned by the clamping assembly 5. Then, the tensioning assembly 4 is inserted into the drill rod 6 under test and tightly fitted to the inner wall of the drill rod 6 under test. After heating the drill rod 6 under test by the flame gun 2, the clamping assembly 5 is rotated to perform torque testing on the heat insulation coating coated on the outer periphery of the drill rod 6 under test. At the same time, the tensioning assembly 4 is tightly fitted to the inner cavity of the drill rod 6 under test and the drill rod 6 under test is stretched by friction. The heat-resistant coating on the surface of the drill rod 6 under test is subjected to tensile testing. Then, the temperature of the surface of the drill rod 6 under test is detected by the thermometer 3 to obtain the specific performance parameters of the heat insulation coating in actual use.

[0028] Please refer to the instruction manual appendix. Figure 3The tensioning assembly 4 includes a drive rod 41 for axial movement. A mounting base 42 is connected to the end of the drive rod 41 near the clamping assembly 5. The mounting base 42 is coaxially arranged with the drive rod 41. Further, a connecting plate 43 is provided on the side of the mounting base 42 facing away from the drive rod 41. Preferably, the thickness of the mounting base 42 is greater than the thickness of the connecting plate 43, so that the mounting base 42 has sufficient strength to withstand the load applied by the drive rod 41, expanding the load range that this application can detect. The connecting plate 43 acts as a buffer component, preventing the stress of the drive rod 41 from directly acting on the transmission rod 48 and the first guide rod 46. It should be noted that the connecting plate 43 is connected to an insertion rod 44 via the first guide rod 46, and the side wall of the insertion rod 44... A plurality of second guide rods 47 are provided, each group of second guide rods 47 is arranged radially, and a plurality of groups of second guide rods 47 are evenly arranged along the axial direction of the insertion rod 44. The insertion rod 44 is connected to a plurality of limiting plates 45 through the second guide rods 47. The height direction of the limiting plates 45 is parallel to the extension and retraction direction of the tensioning assembly 4. Preferably, the first guide rod 46 can slide within the mounting base 42 and the connecting plate 43, and the second guide rod 47 can slide inside the insertion rod 44. A transmission rod 48 is hinged between the end of the limiting plate 45 near the mounting base 42 and the edge of the connecting plate 43, that is, the two ends of the transmission rod 48 can rotate around the end of the limiting plate 45 and the edge of the connecting plate 43, respectively. Preferably, the length of the limiting plate 45 is less than the length of the insertion rod 44.

[0029] During the process of the tensioning assembly 4 being inserted into the inner cavity of the drill rod 6 to be tested and fixed therein, before it is inserted into the drill rod 6, the inner walls of each limiting plate 45 are tightly fitted with the insertion rod 44. At this time, the overall diameter of the tensioning assembly 4 is smaller than the diameter of the drill rod 6 to be tested, and the tensioning assembly 4 can easily be inserted into the drill rod 6 to be tested. When the tensioning assembly 4 is inserted to a certain extent, the lower ends of each limiting plate 45 first abut against the bottom surface of the inner cavity of the clamping assembly 5. However, since the length of the insertion rod 44 is smaller than the length of the limiting plate 45, the insertion rod 44 can continue to move downwards. The transmission rod 48 is connected to the connecting plate 43 at one end. The height is higher than the other end. At this time, the movement of the limiting plate 45 and the insertion rod 44 is reflected in the transmission rod 48 as follows: the axial degree of freedom of the end of the transmission rod 48 connected to the limiting plate 45 is locked, the end of the transmission rod 48 connected to the connecting plate 43 continues to move downward, the transmission rod 48 is a rigid rod, and the transmission rods 48 in the shape of "umbrella ribs" are spread out. The limiting plate 45 connected to the transmission rod 48 is pushed to the side away from the axis of the insertion rod 44, so that the outer wall of the limiting plate 45 fits against the inner wall of the drill rod 6 to be tested. The tightness of the connection between the limiting plate 45 and the drill rod 6 to be tested increases with the increase of the thrust of the drive rod 41.

[0030] Preferably, the first guide rod 46 is used to guide the axial movement of the insertion rod 44 to prevent the insertion rod 44 from swinging during the insertion of the drill rod 6 to be tested. The second guide rod 47 is used to guide the movement of the limiting plate 45 to ensure that the displacement of each part of the limiting plate 45 is the same, so as to avoid uneven force on the transmission rod 48 due to the transmission rod 48 being located at the top, which would prevent the tensioning assembly 4 from being firmly connected to the drill rod 6 to be tested. The first guide rod 46 is parallel to the axis of the insertion rod 44, the axis of the second guide rod 47 is perpendicular to the insertion rod 44, and the extension and retraction direction of each telescopic rod 55 is parallel to the axis of the second guide rod 47.

[0031] Please refer to the instruction manual appendix. Figure 4 The clamping assembly 5 includes a rotating seat 51, with a drive cylinder 52 inside the rotating seat 51. A rotating cylinder 53 is fixed on the end face of the rotating seat 51 near the tensioning assembly 4. The rotating cylinder 53 and the rotating seat 51 have opposite opening directions. Several telescopic rods 55 are threaded through the side wall of the rotating cylinder 53. Each telescopic rod 55 can slide within the side wall of the rotating cylinder 53, and the sliding direction is always pointing towards the axis of the rotating seat 51. A clamping plate 56 is vertically connected to the end of each telescopic rod 55 away from the drive cylinder 52. The clamping plate 56 is equipped with a stress sensor for detecting the tension and torque on the drill rod 6 under test. The clamping plate 56 is driven by the telescopic rods 55 to clamp the drill rod under test. Preferably, an air cylinder 54 is connected between the drive cylinder 52 and the telescopic rod 55 on the outer wall of the rod 6. The drive cylinder 52 controls the extension and retraction of the air cylinder 54 by drawing in and blowing air, thereby achieving the clamping and opening of the clamping assembly 5. Furthermore, a cover plate 57 is provided on the outside of the rotating cylinder 53. The cover plate 57 seals the inner cavity of the rotating cylinder 53 to prevent external debris from falling onto the drive cylinder 52 and the telescopic rod 55, which would cause the movement of the clamping plate 56 to be uneven. A positioning protrusion 58 is provided on the end face of the cover plate 57 facing away from the drive cylinder 52. The lower end of the drill rod 6 to be tested mates with the positioning protrusion 58 to complete the initial positioning of the drill rod 6 to be tested and the clamping assembly 5. Please refer to the appendix of the instruction manual. Figure 5 On the inner wall of the rotating cylinder 53, there is also a drive gear 59, which meshes with a gear. The gear is coaxially connected to the output circumference of the drive component 7, which is fixed to the ground of the testing site. During the process of fixing the drill rod 6 to be tested by the clamping assembly 5, the drive cylinder 52 draws air from the air cylinder 54, causing the air cylinder 54 to contract. The air cylinder 54 drives each clamping plate 56 to move towards the axis of the drill rod 6 to be tested through the telescopic rod 55 until the clamping plate 56 is in contact with the outer wall of the drill rod 6 to be tested, thus firmly connecting the drill rod 6 to the clamping assembly 5.

[0032] Through the above operations, the inner and outer walls of the drill rod 6 under test are fixed by the tensioning component 4 and the clamping component 5, respectively. The tensioning component 4 is pulled away from the end of the clamping component 5, so that the heat insulation coating on the outer wall of the drill rod 6 under test is subjected to axial tension. Then the drive component 7 operates, and drives the rotating seat 51 to rotate through the gear. The clamping plate 56, which is in close contact with the inner wall of the component 6 under test, applies circumferential torque to the heat insulation coating, thus simulating the actual use environment of the drill rod 6 under test. Furthermore, through the "opening" process of each transmission rod 48, the limiting plate 45 is made to fit with the inner wall of the drill rod 6 under test. The telescopic rod 55 completes the fastening of the outer wall of the drill rod 6 under test by pulling each clamping plate 56. The pulling distance of the telescopic rod 55 and the degree of opening of the transmission rod 48 are both flexibly adjustable. This application can be used to test drill rods 6 of various sizes.

[0033] Preferably, in order to ensure that the tensioning component 4, the clamping component 5 and the drill rod to be tested 6 are firmly attached, a number of friction blocks are evenly distributed on the inner wall of the clamping plate 56 and the outer wall of the limiting plate 45. Preferably, the friction blocks can be made of silicone.

[0034] Please refer to the instruction manual appendix. Figure 3 and 4 A first elastic element 8 is provided between the insertion rod 44 and the connecting plate 43. The first elastic element 8 is coaxially arranged with the insertion rod 44, and the insertion rod 44 is located in the area enclosed by each first guide rod 46. A second elastic element 9 is provided on the outer periphery of each air cylinder 54. One end of the second elastic element 9 abuts against the outer wall of the rotating cylinder 53, and the other end is connected to the outer wall of the telescopic rod 55. When the present invention finishes the test of the drill rod 6, the drive rod 41 and the drive cylinder 52 stop the power output. The first elastic element 8 contracts and pulls the insertion rod 44, releasing the tight fit between the limiting plate 45 and the drill rod 6. The second elastic element 9 expands and pushes each clamping plate 56 to move away from the drill rod 6, releasing the clamping plate 56 from the drill rod 6, making the removal process of the drill rod 6 easier.

[0035] Preferably, an opening and closing plate 11 is provided on the side wall of the testing box 1. The opening and closing plate 11 is used to open the inner cavity of the testing box 1. The operator puts the drill rod 6 to be tested into the testing box 1 through the opening and closing plate 11 and engages it with the positioning protrusion 58. A control box 12 is provided on one side of the outer wall of the testing box 1. The control box 12 is connected to the flame gun 2, the thermometer 3, and the tension sensor. The control box 12 is provided with a control panel. The operator can adjust the power of the flame gun 2 through the control panel and record the surface temperature of the drill rod 6 under various tension and torque conditions through the thermometer 3. In addition, an observation window is provided on the opening and closing plate 11. The operator can observe the surface condition of the drill rod 6 under various working conditions through the observation window and identify whether the heat insulation coating on the surface of the drill rod 6 has peeled off, cracked, or delaminated.

[0036] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0037] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A drill pipe thermal barrier coating detection device, characterized by, include: The test box (1) is equipped with a flame gun (2) and a thermometer (3) on its inner wall. The flame gun (2) is used to heat the drill rod (6) to be tested, and the thermometer (3) is used to detect the surface temperature of the drill rod (6) to be tested. Tensioning assembly (4), which is telescopically disposed on the top surface of the inner cavity of the test box (1), and can extend into the inner cavity of the drill rod (6) to be tested and be tensioned and fixed with the drill rod (6) to be tested; The clamping assembly (5) is rotatably disposed on the bottom surface of the inner cavity of the test box (1). The drill rod (6) to be tested can be snapped into the inside of the clamping assembly (5). The clamping assembly (5) is used to tightly clamp the outer wall of the drill rod (6) to be tested. The clamping assembly (5) is provided with a tension sensor. The tension sensor is used to detect the stress on the surface of the drill rod (6) to be tested.

2. The drill pipe thermal spray coating inspection apparatus of claim 1, wherein, The stretching assembly (4) includes a drive rod (41). The end of the drive rod (41) near the clamping assembly (5) is coaxially connected to a mounting base (42). The mounting base (42) is connected to the insertion rod (44) through a connecting plate (43). Limiting plates (45) are evenly distributed on the outer periphery of the insertion rod (44). The length of the limiting plates (45) is less than the length of the insertion rod (44). A transmission rod (48) is hinged between the end of each limiting plate (45) and the connecting plate (43). A plurality of first guide rods (46) are provided at the end of the insertion rod (44) near the connecting plate (43). The first guide rods (46) are slidably disposed in the connecting plate (43) and the mounting base (42). A plurality of second guide rods (47) are connected between the insertion rod (44) and the limiting plate (45). Each second guide rod (47) can slide in the insertion rod (44).

3. The drill pipe thermal spray coating inspection apparatus of claim 2, wherein, The clamping assembly (5) includes a rotating seat (51), and a driving cylinder (52) is provided in the inner cavity of the rotating seat (51). A rotating cylinder (53) is fixed on one end face of the rotating seat (51) near the tensioning assembly (4). Several telescopic rods (55) are provided on the side wall of the rotating cylinder (53). An air cylinder (54) is connected between the telescopic rods (55) and the driving cylinder (52). The driving cylinder (52) blows or draws air into the air cylinder (54). Air is drawn in to control the movement of the telescopic rod (55). The end of the telescopic rod (55) away from the drive cylinder (52) is connected to a clamping plate (56). The clamping plate (56) can fit against the outer wall of the drill rod (6) to be tested. The outer periphery of the rotating cylinder (53) is provided with a cover plate (57). The end of the cover plate (57) away from the drive cylinder (52) is provided with a positioning protrusion (58). The positioning protrusion (58) can dock with the inner cavity of the drill rod (6) to be tested.

4. The drill pipe thermal spray coating inspection apparatus of claim 3, wherein, The inner cavity sidewall of the rotating seat (51) is fixed with a drive gear tooth (59), the drive gear tooth (59) meshes with a gear, the gear is coaxially connected to the output shaft of the drive member (7), and the drive member (7) is fixed to the external ground.

5. The drill pipe thermal spray coating inspection apparatus of claim 3, wherein, A first elastic element (8) is connected between the insert rod (44) and the connecting plate (43). The first elastic element (8) is located within the area enclosed by each of the first guide rods (46) and is coaxially arranged with the insert rod (44). A second elastic element (9) is provided on the outer periphery of the air cylinder (54). The second elastic element (9) is used to push against the telescopic rod (55).

6. The drill pipe thermal spray coating inspection apparatus of claim 5, wherein, The inner wall of the clamping plate (56) and the outer wall of the limiting plate (45) are both provided with friction blocks.

7. The drill pipe thermal spray coating inspection apparatus of claim 1, wherein, The side wall of the test box (1) is connected to an opening and closing plate (11), which is used to open the inner cavity of the test box (1). The opening and closing plate (11) is provided with an observation window.

8. The drill pipe thermal spray coating inspection apparatus of claim 7, wherein, The outer wall of the detection box (1) is connected to a control box (12). The control box (12) is connected to the flame gun (2) and the thermometer (3) by signal. The control box (12) is equipped with a control panel for controlling the flame gun (2) and the thermometer (3).

9. The drill pipe thermal spray coating inspection apparatus of claim 3, wherein, Each of the first guide rods (46) is parallel to the axis of the insertion rod (44), the axis of the second guide rod (47) is perpendicular to the insertion rod (44) and is radially arranged on the outer periphery of the insertion rod (44), and the extension and retraction direction of each of the telescopic rods (55) is parallel to the axis of the second guide rod (47).

Images