A laser detection device for oil drill pipe joints

Abstract

The application discloses a kind of petroleum drill pipe joint laser detection equipment, it is related to laser detection equipment technical field, including inner diameter detection component, the inner diameter detection component includes the installation sleeve being set to top, gas hole is opened in the inside axial of installation sleeve, and the opening of gas hole top end is equipped with limit recess.This petroleum drill pipe joint laser detection equipment, the prism of this application is designed to extend into the sensor external structure of small inner diameter drill pipe joint body, breaks the specification limit of traditional detection equipment, can adapt to more different size drill pipe joint detection needs, using non-contact laser measurement mode, avoid damage to the inner wall of drill pipe joint body, while prism axial movement does not change laser radial measurement datum, ensure that inner diameter calculation key parameter is stable, measurement result is accurate and reliable, and combined with the outer diameter data measured previously can infer the size fit of body wall thickness and male joint and female joint, improve the comprehensiveness and data accuracy of detection.

Description

Technical Field

[0001] This invention relates to the field of laser inspection equipment technology, specifically to a laser inspection device for oil drill pipe joints. Background Technology

[0002] Drill pipe joints, as a key component of drill pipe, are divided into male and female joints, which connect to both ends of the drill pipe body. The special threads (coarse threads) on these joints are used to connect the individual drill pipes together. Drill pipe joint inspection is an important part of ensuring the safety and efficiency of drilling operations. By inspecting the diameter at different positions inside the drill pipe joint, the smooth flow of internal fluids can be ensured.

[0003] For example, invention patent CN119803292B discloses a testing device for oil drill pipe joints. The technical solution for detecting the inner diameter of the oil drill pipe joint in this patent document involves an electric rotary head rotating circumferentially along a splined rod. The electric rotary head drives two laser rangefinders to detect the inner diameter of the joint at different locations. The laser rangefinders transmit the measured values ​​to a controller. When the operator presses down on the splined rod, the splined rod moves the electric rotary head downwards, compressing the first elastic element. Under the operator's control, the two laser rangefinders detect any position on the inner wall of the joint. After the two laser rangefinders transmit the measured values ​​to the controller, the controller calculates the average of the measured values ​​to determine whether the inner diameter of the joint is qualified. As described above, this patent requires two laser rangefinders to be used during the inner diameter detection process. The rangefinder is inserted into the axial through-hole of the drill pipe joint by an electric rotary head for detection. However, the drill pipe joint consists of a male connector located outside the main body and a female connector located inside the main body. This means that the through-hole inside the drill pipe joint is not a straight hole, but has an inner diameter variation. In the narrower inner diameter, two laser rangefinders cannot be accommodated at the same time, resulting in a blind zone for the inner diameter detection of the drill pipe joint. In addition, the wall thickness of the drill pipe joint is usually designed to be relatively thick to withstand the strong biting force of the pliers during disassembly. This patent lacks the technical means to detect the outer diameter of the main body and the outer diameter of the male connector protruding from the main body, thus making it impossible to obtain the wall thickness data of the drill pipe joint and the outer diameter data of the male connector outside the main body, resulting in a large detection blind zone. Summary of the Invention

[0004] The purpose of this invention is to provide a laser inspection device for oil drill pipe joints to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a laser inspection device for oil drill pipe joints, comprising an inner diameter inspection component, the inner diameter inspection component comprising an installation sleeve disposed at the top end, the installation sleeve having an axially penetrating vent hole, the top opening of the vent hole having a limiting notch, and the drill pipe joint body being positioned within the limiting notch; two laser displacement sensors being symmetrically fixed to the inner wall of the bottom opening of the vent hole; a spring being sleeved on the outside of the installation sleeve, the end of the spring being elastically connected to a lifting sleeve away from the top edge of the installation sleeve; an end ring being integrally fixedly connected to the bottom end of the lifting sleeve, the two ends of the end ring having through holes that slide with corresponding guide rods, and a second spring being sleeved on the outside of the guide rods; a connecting rod being fixedly connected to the bottom end of the lifting sleeve cavity, and a prism being fixedly installed at the end of the connecting rod.

[0006] Furthermore, the laser displacement sensor is symmetrically installed at the bottom end of the mounting sleeve opening, and a lifting sleeve is axially elastically slidable outside the mounting sleeve by a spring.

[0007] Furthermore, the lasers emitted by the two laser displacement sensors are positioned side-by-side on both sides of the prism, and the lasers are bent at a 90-degree angle on both sides of the prism and then irradiate the inner wall of the drill pipe joint body.

[0008] Furthermore, the center-to-center distance between the two laser displacement sensors plus the radial distance between the two laser beams after being bent 90 degrees by the prism is the inner diameter of the drill pipe joint body to be tested. The outer diameter of the prism is smaller than the inner diameter of the narrowest part of the drill pipe joint body. When the connecting rod moves axially inside the drill pipe joint body, the axial distance between the prism and the laser displacement sensor changes synchronously.

[0009] Furthermore, a linkage impurity removal component is installed in the bottom recess of the end ring. The linkage impurity removal component includes a cylinder embedded in the bottom recess of the end ring. The top and side ends of the cylinder are respectively connected to one-way air pipes. The one-way air pipe located on the side of the end ring is a one-way air inlet, and the one-way air pipe corresponding to the axial air hole in the sleeve is a one-way air outlet.

[0010] Furthermore, the linkage impurity removal assembly also includes a piston axially slidably mounted inside the cylinder body. The top of the piston is connected to a spring three, and the piston is elastically connected to the inner wall of the top of the cylinder body through the spring three. The spring coefficient of the spring three is successively smaller than that of the spring two and the spring one.

[0011] Furthermore, the linkage impurity removal assembly also includes a shaft bracket fixedly connected to the bottom end of the piston. The shaft bracket is located on the outer side of the bottom of the cylinder, and rollers are installed inside the shaft bracket.

[0012] Furthermore, the guide rod is fixedly installed at the top inside the U-shaped frame, and a guide rail is laid at the bottom inside the U-shaped frame.

[0013] Furthermore, a support is fixedly installed at the top of the U-shaped frame, and a liner is fixedly installed on the inner side of the top of the support. An outer diameter laser rangefinder is symmetrically installed on both sides of the support, and the laser windows of the outer diameter laser rangefinders on both sides are located at the radial ends of the drill pipe joint body.

[0014] Furthermore, a cylinder is bolted to the side end of the U-shaped frame, and a wedge is fixedly connected to the telescopic end of the cylinder. The wedge is provided with multiple conical surfaces in a stepped manner, and all the conical surfaces are in close contact with the outer circle of the roller.

[0015] This invention provides a laser inspection device for oil drill pipe joints, which has the following beneficial effects; 1. This application features a prism insertion and sensor external structure designed for small-diameter drill pipe joints. This breaks through the specification limitations of traditional testing equipment and can adapt to the testing needs of drill pipe joints of various sizes. It adopts a non-contact laser measurement method to avoid damage to the inner wall of the drill pipe joint body. At the same time, the axial movement of the prism does not change the laser radial measurement reference, ensuring the stability of key parameters for inner diameter calculation and accurate and reliable measurement results. Combined with previously measured outer diameter data, the wall thickness of the body and the dimensional fit between the male and female joints can be inferred, improving the comprehensiveness and accuracy of the testing.

[0016] 2. This application uses a stepped force control design to achieve sequential driving of each stage of the inspection process, ensuring that the piston completes the impurity removal action first, and then drives the lifting sleeve to lift the drill pipe joint body, avoiding action conflicts and ensuring a smooth and orderly lifting process. Two key external dimensions are inspected in one lift, improving the comprehensiveness of the inspection and the accuracy of the data.

[0017] 3. The impurity removal action in this application is triggered by the cylinder pushing the wedge block and squeezing the roller, which is seamlessly connected with the overall detection process. It eliminates the impact of impurities on the accuracy of the inner diameter of the subsequent laser detection from the source, and provides a clean detection environment for subsequent measurements. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention; Figure 2 This is a cross-sectional view of the inner diameter detection component of the present invention; Figure 3 This is a schematic diagram of the exploded structure of the inner diameter detection component of the present invention; Figure 4 This is a schematic cross-sectional view of the mounting sleeve of the present invention; Figure 5 This is a schematic diagram of the cross-sectional structure of the end ring of the present invention; Figure 6 This is a schematic diagram illustrating the principle of laser detection of inner diameter in this invention; Figure 7 This is a schematic diagram illustrating the detection of state changes according to the present invention.

[0019] In the diagram: 1. Inner diameter detection component; 101. Mounting sleeve; 102. Air hole; 103. Limiting notch; 104. Drill pipe joint body; 105. Laser displacement sensor; 106. Spring one; 107. Lifting sleeve; 108. End ring; 109. Guide rod; 110. Spring two; 111. Connecting rod; 112. Prism; 2. Linkage impurity removal component; 201. Cylinder; 202. One-way air pipe; 203. Piston; 204. Spring three; 205. Shaft bracket; 206. Roller; 3. U-shaped frame; 4. Guide rail; 5. Support; 6. Liner; 7. Outer diameter laser rangefinder; 8. Cylinder; 9. Wedge block; 10. Multi-stage conical surface. Detailed Implementation

[0020] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention. Please see Figures 1 to 7 This invention provides a technical solution: a laser inspection device for oil drill pipe joints, including an inner diameter inspection component 1. The inner diameter inspection component 1 includes an installation sleeve 101 disposed at the top end. An air hole 102 is axially penetrated inside the installation sleeve 101, and a limiting recess 103 is provided at the top opening of the air hole 102. The drill pipe joint body 104 is placed inside the limiting recess 103. Two laser displacement sensors 105 are symmetrically fixed on the inner wall of the bottom opening of the air hole 102. A spring 106 is sleeved on the outside of the installation sleeve 101, and the spring 106 is positioned away from the installation sleeve 101. One end of the top edge of 01 is elastically connected to the lifting sleeve 107. The bottom end of the lifting sleeve 107 is integrally fixedly connected to the end ring 108, and the two ends of the end ring 108 are slidably engaged with the corresponding guide rod 109 through the holes. The guide rod 109 is sleeved with a second spring 110. The bottom end of the cavity of the lifting sleeve 107 is fixedly connected to the connecting rod 111, and the end of the connecting rod 111 is fixedly installed with a prism 112. The laser displacement sensor 105 is symmetrically installed at the bottom end of the opening of the mounting sleeve 101, and the lifting sleeve 107 is axially elastically slidable on the outside of the mounting sleeve 101 through a first spring 106. The specific operation is as follows: when the piston 203 moves to the top of the cylinder 201, the wedge 9 moves to the secondary conical surface. The conical surface of the wedge 9 squeezes the roller 206, causing the end ring 108 to overcome the elastic force of the second spring 110 and rise on the guide rod 109. Because the spring coefficient of the third spring 204 in this application is successively smaller than that of the second spring 110 and the first spring 106, after the piston 203 moves to the top of the cylinder 201 against the elastic force of the third spring 204, the second spring 110 is then sequentially compressed, causing the lifting sleeve 107 to drive the mounting sleeve 101 to rise axially, thereby driving the drill pipe joint placed in the limiting notch 103 at the top of the mounting sleeve 101. The body 104 passes between the laser windows opposite the outer diameter laser rangefinder 7. The outer diameter laser rangefinder 7 scans the outer contour of the drill pipe joint body 104 to accurately obtain the outer diameter data of the drill pipe joint body 104 to be tested and the taper dimension of the male connector on the body. This application uses a stepped force control design to realize the sequential drive of each stage of the detection process, ensuring that the piston 203 completes the impurity removal action first, and then drives the lifting sleeve 107 to lift the drill pipe joint body 104, avoiding action conflict and ensuring that the lifting process is smooth and orderly. Two key external dimensions are detected by one lifting, improving the comprehensiveness of the detection and the accuracy of the data. Please see Figures 2 to 6 The lasers emitted by the two laser displacement sensors 105 are side by side illuminating the two sides of the prism 112. The lasers are bent at ninety degrees on both sides of the prism 112 and illuminating the two sides of the inner wall of the drill pipe joint body 104. The center distance between the two laser displacement sensors 105 plus the radial distance of the two laser beams after being bent at ninety degrees by the prism 112 is the inner diameter of the drill pipe joint body 104 to be measured. The outer dimensions of the prism 112 are smaller than the inner diameter of the narrowest part of the drill pipe joint body 104. When the connecting rod 111 moves axially inside the drill pipe joint body 104, the axial distance between the prism 112 and the laser displacement sensors 105 changes synchronously. The specific operation is as follows: When the drill pipe joint body 104 moves to the top and abuts against the liner 6 inside the support 5, the height of the mounting sleeve 101 is fixed on the third-stage conical surface. Under the squeezing action of the wedge block 9 conical surface, the spring 106 connecting the mounting sleeve 101 and the lifting sleeve 107 is compressed. At this time, the connecting rod 111 fixed at the bottom of the cavity of the lifting sleeve 107 is axially lifted inside the mounting sleeve 101 and extends into the drill pipe joint body 104 with the prism 112. The lasers emitted by the two laser displacement sensors 105 at the bottom end of the drill pipe joint 104 are positioned side-by-side and illuminate both sides of the prism 112. The laser beams are bent at a 90-degree angle on both sides of the prism 112 and then illuminate both sides of the inner wall of the drill pipe joint body 104. The center-to-center distance between the two laser displacement sensors 105, plus the radial distance between the two laser beams after the 90-degree bend of the prism 112, equals the inner diameter of the drill pipe joint body 104 to be measured. On the one hand, the connecting rod 111 drives the lower prism 112 to move axially within the drill pipe joint body 104, allowing for seamless movement. The inner diameter of the female connector inside the drill pipe joint body 104 is obtained under non-contact conditions. On the other hand, the laser displacement sensor 105 does not need to follow the prism 112 into the drill pipe joint body 104. When the prism 112 moves up and down along the axis of the circular tube and the sensor position remains unchanged, it will not affect the measurement result of the inner diameter of the circular tube. The core reason is that the displacement in the axial direction does not change the measurement reference of the laser in the radial direction of the circular tube. The key parameters required for inner diameter calculation remain stable. The prism 112 extension and sensor external structure designed for the small inner diameter drill pipe joint body 104 in this application breaks the specification limitations of traditional detection equipment and can adapt to the detection needs of more drill pipe joints of different sizes. The non-contact laser measurement method avoids damage to the inner wall of the drill pipe joint body 104. At the same time, the axial movement of the prism 112 does not change the laser radial measurement reference, ensuring the stability of the key parameters for inner diameter calculation and the accuracy and reliability of the measurement results. Combined with the previously measured outer diameter data, the body wall thickness and the dimensional fit between the male and female connectors can be inferred, improving the comprehensiveness of the detection and the accuracy of the data. Please see Figures 3 to 5A linkage impurity removal assembly 2 is installed in the recess at the bottom of the end ring 108. The linkage impurity removal assembly 2 includes a cylinder 201 embedded in the recess at the bottom of the end ring 108. The top and side ends of the cylinder 201 are respectively connected to one-way air pipes 202. The one-way air pipe 202 located on the side of the end ring 108 is for one-way air intake, and the one-way air pipe 202 corresponding to the axial air hole 102 in the sleeve 101 is for one-way air outlet. The linkage impurity removal assembly 2 also includes a piston 203 axially slidably installed inside the cylinder 201. The top end of the piston 203 is connected to a spring 204, and the piston 203 is elastically connected to the inner wall of the top end of the cylinder 201 through the spring 204. The spring coefficient of the spring 204 is successively smaller than that of the spring 110 and the spring 106. 2 also includes a shaft bracket 205 fixedly connected to the bottom end of the piston 203. The shaft bracket 205 is located on the outer side of the bottom of the cylinder body 201, and a roller 206 is installed inside the shaft bracket 205. The guide rod 109 is fixedly installed on the top inside of the U-shaped frame 3, and a guide rail 4 is laid on the bottom inside of the U-shaped frame 3. A support 5 is fixedly installed on the top outside of the U-shaped frame 3, and a liner 6 is fixedly installed on the inner side of the top of the support 5. An outer diameter laser rangefinder 7 is symmetrically installed on both sides of the support 5, and the laser windows of the outer diameter laser rangefinder 7 on both sides are located at the radial ends of the drill pipe joint body 104. A cylinder 8 is bolted to the side end of the U-shaped frame 3, and a wedge 9 is fixedly connected to the telescopic end of the cylinder 8. A multi-stage conical surface 10 is provided on the wedge 9 in a stepped manner, and the multi-stage conical surface 10 is tightly fitted with the outer circle of the roller 206. The specific operation is as follows: the drill pipe connector body 104 to be tested is placed inside the limiting recess 103 at the top opening of the mounting sleeve 101. The cylinder 8 is activated and pushes the wedge 9 to slide at the upper limit of the guide rail 4. This application has a multi-stage conical surface 10 on the wedge 9. On the first-stage conical surface, the wedge 9 and the outer circle of the roller 206 are in contact and driven by the conical surface to push the piston 203 on the shaft frame 205 to rise in the cylinder 201. The gas in the cylinder 201 is discharged from the one-way air pipe 202 at the top air outlet and blown into the cavity of the drill pipe connector body 104 through the axial air hole 102 between the mounting sleeve 101 and the lifting sleeve 107 to remove the impurities adhering to the inner wall of the cavity of the drill pipe connector body 104. The impurity removal action of this application is triggered by the cylinder 8 pushing the wedge 9 and squeezing the roller 206. It is seamlessly connected with the overall testing process, eliminating the impact of impurities on the accuracy of the inner diameter of the subsequent laser detection from the source, and providing a clean testing environment for subsequent measurements.

[0021] It should be noted that: the instruction manual includes... Figure 7 The process flow shown is as follows: initial detection state - air blowing and impurity removal state - outer diameter detection state - inner diameter detection state.

[0022] In summary, when using this laser inspection equipment for oil drill pipe joints: First, the drill pipe connector body 104 to be tested is placed inside the limiting recess 103 at the top opening of the mounting sleeve 101. The cylinder 8 is activated and pushes the wedge 9 to slide at the upper limit of the guide rail 4. This application has a multi-stage conical surface 10 on the wedge 9. On the first-stage conical surface, the wedge 9 and the outer circle of the roller 206 are in contact and driven by the conical surface to push the piston 203 on the shaft frame 205 to rise in the cylinder 201. The gas in the cylinder 201 is discharged from the one-way air pipe 202 at the top air outlet and blown into the cavity of the drill pipe connector body 104 through the axial air hole 102 between the mounting sleeve 101 and the lifting sleeve 107 to remove the impurities adhering to the inner wall of the cavity of the drill pipe connector body 104. The impurity removal action of this application is triggered by the cylinder 8 pushing the wedge 9 and squeezing the roller 206. It is seamlessly connected with the overall testing process, eliminating the impact of impurities on the accuracy of the inner diameter of the subsequent laser testing from the source, and providing a clean testing environment for subsequent measurements. Secondly, when the piston 203 moves to the top of the cylinder 201, the wedge 9 moves to the secondary conical surface. The conical surface of the wedge 9 squeezes the roller 206, causing the end ring 108 to overcome the elastic force of the second spring 110 and rise on the guide rod 109. Because the spring coefficient of the third spring 204 in this application is successively smaller than that of the second spring 110 and the first spring 106, after the piston 203 moves to the top of the cylinder 201 against the elastic force of the third spring 204, the second spring 110 is then sequentially compressed, causing the lifting sleeve 107 to drive the mounting sleeve 101 to rise axially, thereby driving the drill pipe joint body placed in the limiting notch 103 at the top of the mounting sleeve 101. 104 passes between the laser windows opposite to the outer diameter laser rangefinder 7. The outer diameter laser rangefinder 7 scans the outer contour of the drill pipe joint body 104 to accurately obtain the outer diameter data of the drill pipe joint body 104 to be tested and the taper dimension of the male connector on the body. This application realizes the sequential drive of each stage of the detection process through a stepped force control design, ensuring that the piston 203 completes the impurity removal action first, and then drives the lifting sleeve 107 to lift the drill pipe joint body 104, avoiding action conflict and ensuring that the lifting process is smooth and orderly. Two key external dimensions are detected by one lifting, improving the comprehensiveness of the detection and the accuracy of the data. Finally, when the drill pipe joint body 104 moves to the top and abuts against the liner 6 inside the support 5, the height of the mounting sleeve 101 is fixed on the third-stage conical surface. Under the squeezing action of the wedge block 9 conical surface, the spring 106 connecting the mounting sleeve 101 and the lifting sleeve 107 is compressed. At this time, the connecting rod 111 fixed at the bottom of the cavity of the lifting sleeve 107 is axially lifted inside the mounting sleeve 101 and extends into the drill pipe joint body 104 with the prism 112. The lasers emitted by the two laser displacement sensors 105 located at the bottom of the opening of the mounting sleeve 101 are side by side irradiated on both sides of the prism 112. The lasers are bent at ninety degrees on both sides of the prism 112 and irradiate both sides of the inner wall of the drill pipe joint body 104. The center distance between the two laser displacement sensors 105 plus the radial distance of the two laser beams after being bent at ninety degrees by the prism 112 is the inner diameter of the drill pipe joint body 104 to be measured (as per the instruction manual). Figure 6 As shown in the diagram (T=A+B+C), on the one hand, the connecting rod 111 drives the lower prism 112 to move axially within the drill pipe joint body 104, allowing the inner diameter of the female joint inside the drill pipe joint body 104 to be obtained without contact. On the other hand, the laser displacement sensor 105 does not need to follow the prism 112 into the drill pipe joint body 104. When the prism 112 moves up and down along the axis of the circular tube and the sensor position remains unchanged, it will not affect the measurement result of the inner diameter of the circular tube. The core reason is that the displacement in the axial direction does not change the measurement reference of the laser in the radial direction of the circular tube, and the key parameters required for the inner diameter calculation remain unchanged. Stable, this application features a prism 112 extension and sensor external structure designed for the small inner diameter drill pipe joint body 104. This breaks the specification limitations of traditional testing equipment and can adapt to the testing needs of drill pipe joints of more different sizes. It adopts a non-contact laser measurement method to avoid damage to the inner wall of the drill pipe joint body 104. At the same time, the axial movement of the prism 112 does not change the laser radial measurement reference, ensuring the stability of key parameters for inner diameter calculation and accurate and reliable measurement results. Combined with previously measured outer diameter data, the body wall thickness and the dimensional fit between the male and female joints can be inferred, improving the comprehensiveness and accuracy of the testing.

[0023] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0024] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, and the existence of an infinite number of specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A laser inspection device for oil drill pipe joints, comprising an inner diameter inspection component (1), characterized in that, The inner diameter detection component (1) includes a mounting sleeve (101) at the top. An air hole (102) is axially penetrated inside the mounting sleeve (101), and a limiting notch (103) is provided at the top opening of the air hole (102). A drill pipe connector body (104) is placed inside the limiting notch (103). Two laser displacement sensors (105) are symmetrically fixed to the inner wall of the bottom opening of the air hole (102). A spring (106) is sleeved on the outside of the mounting sleeve (101), and the spring (105)... 6) One end of the top edge of the mounting sleeve (101) is elastically connected to the lifting sleeve (107). The bottom end of the lifting sleeve (107) is integrally fixedly connected to an end ring (108), and the two ends of the end ring (108) are slidably engaged with the corresponding guide rod (109). A second spring (110) is sleeved on the outside of the guide rod (109). A connecting rod (111) is fixedly connected to the bottom end of the cavity of the lifting sleeve (107), and a prism (112) is fixedly installed at the end of the connecting rod (111). The laser displacement sensor (1) 05) Symmetrically installed at the bottom of the opening of the mounting sleeve (101), and a lifting sleeve (107) is axially elastically slidable outside the mounting sleeve (101) by a spring (106). A linkage impurity removal component (2) is installed in the bottom recess of the end ring (108). The linkage impurity removal component (2) includes a cylinder (201) embedded in the bottom recess of the end ring (108). The top and side ends of the cylinder (201) are respectively connected to a one-way air pipe (202), and the one-way air pipe located on the side of the end ring (108) is a one-way air inlet pipe (202). 202), and the axial air hole (102) inside the sleeve (101) is a one-way air pipe (202) for one-way air outlet. The linkage impurity removal component (2) also includes a piston (203) axially slidably installed inside the cylinder (201). The top of the piston (203) is connected to a spring three (204), and the piston (203) is elastically connected to the inner wall of the top of the cylinder (201) through the spring three (204). The spring coefficient of the spring three (204) is successively smaller than that of the spring two (110) and the spring one (106).

2. The laser inspection equipment for oil drill pipe joints according to claim 1, characterized in that, The lasers emitted by the two laser displacement sensors (105) are side by side illuminating both sides of the prism (112), and the lasers are located on both sides of the prism (112) and are bent at ninety degrees to illuminate both sides of the inner wall of the drill pipe joint body (104).

3. The laser inspection equipment for oil drill pipe joints according to claim 2, characterized in that, The center distance between the two laser displacement sensors (105) plus the radial distance after the two laser beams are bent at ninety degrees by the prism (112) is the inner diameter of the drill pipe joint body (104) to be tested. The outer dimensions of the prism (112) are smaller than the inner diameter of the narrowest part of the drill pipe joint body (104). When the connecting rod (111) moves axially inside the drill pipe joint body (104), the axial distance between the prism (112) and the laser displacement sensor (105) changes synchronously.

4. The laser inspection equipment for oil drill pipe joints according to claim 3, characterized in that, The linkage impurity removal component (2) also includes a shaft bracket (205) fixedly connected to the bottom end of the piston (203). The shaft bracket (205) is located on the outer side of the bottom of the cylinder body (201), and a roller (206) is installed inside the shaft bracket (205).

5. The laser inspection equipment for oil drill pipe joints according to claim 4, characterized in that, The guide rod (109) is fixedly installed at the top inside the U-shaped frame (3), and the bottom inside the U-shaped frame (3) is provided with a guide rail (4).

6. The laser inspection equipment for oil drill pipe joints according to claim 5, characterized in that, The U-shaped frame (3) is fixedly installed with a support (5) at its top outer end, and a liner (6) is fixedly installed on the inner side of the top end of the support (5). The support (5) is symmetrically installed with an outer diameter laser rangefinder (7) on both sides, and the laser windows of the outer diameter laser rangefinders (7) on both sides are located at the radial ends of the drill pipe joint body (104).

7. The laser inspection equipment for oil drill pipe joints according to claim 6, characterized in that, The U-shaped frame (3) is bolted to the side end of a cylinder (8), and the cylinder (8) is connected to a wedge (9) at the telescopic end. The wedge (9) is provided with a stepped multi-level conical surface (10), and the multi-level conical surface (10) is in close contact with the outer circle of the roller (206).

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