A flaw detection device for an oil drill pipe

Abstract

This utility model relates to the field of drill pipe flaw detection technology, and discloses a flaw detection device for oil drill pipe, including a support base and a fixing plate. A rotary motor is located at the center of the upper surface of the support block, and a threaded rod is located at the output end of the rotary motor. A connecting device is located at the end of the threaded rod, and a drill pipe body is located at the end of the connecting device. The connecting device includes a fixing plate, a suction cup located at the center of the other side wall of the fixing plate, a miniature air pump located at the center of one inner side wall of the fixing plate, and a connecting threaded post located at the center of the other side wall of the fixing plate. The outer center of the connecting threaded post is threadedly connected to the drill pipe body near its other end. In this utility model, the connecting device allows for the replacement and adaptation of the connecting threaded post according to different diameter drill pipe bodies, improving the versatility and flexibility of the equipment, thereby enhancing its practicality.

Description

Technical Field

[0001] This utility model relates to the field of drill pipe flaw detection technology, and in particular to a flaw detection device for oil drill pipe. Background Technology

[0002] In oil drilling operations, drill pipe is a key drilling tool, and its quality and integrity are directly related to the safety and efficiency of drilling operations. Since drill pipe is subjected to complex stress and harsh drilling environment during long-term use, regular flaw detection is an important means to ensure its quality. It is necessary to use oil drill pipe flaw detection equipment to perform flaw detection.

[0003] Traditional flaw detection devices for oil drill pipes are inconvenient for operators to quickly install and remove threaded posts, and are not easy to adjust and adapt to drill pipes of different diameters. This reduces the versatility and flexibility of the equipment, thereby reducing its practicality. Therefore, those skilled in the art have provided a flaw detection device for oil drill pipes to solve the problems mentioned in the background art. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a flaw detection device for oil drill pipes. Through a connecting device, it facilitates quick installation, removal, and replacement by workers, and allows for the replacement and adaptation of connecting threaded posts according to different diameter drill pipe bodies, thereby improving the versatility and flexibility of the equipment and enhancing its practicality.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a flaw detection device for oil drill pipe, comprising a support base and a fixing plate. The fixing plate is disposed at one side of the center of the upper end face of the support base. A threaded hole is provided at the center of one side of the fixing plate. Slide rail structures are provided at both the front and rear sides of one side of the upper end face of the support base. A support block is provided at the center of the upper end face of the two slide rail structures. A rotary motor is provided at the center of the upper end face of the support block. A threaded rod is provided at the output end of the rotary motor. A connecting device is provided at the end of the threaded rod. A drill pipe body is provided at the end of the connecting device. Two support devices are arranged horizontally at the other side of the center of the upper end face of the support base.

[0006] The connecting device includes a fixed plate, which is located at the end of the threaded rod. A suction cup is located at the center of the other side wall of the fixed plate, and the suction cup passes through the other side wall of the fixed plate to the other inner side wall of the fixed plate. A miniature air pump is located at the center of one inner side wall of the fixed plate, and the input end of the miniature air pump is connected to the suction cup. A connecting threaded post is located at the center of the other side wall of the fixed plate, and the outer center of the connecting threaded post is threadedly connected to the drill rod body at the other end.

[0007] Through the above technical solution, by connecting the threaded post to the other side wall of the fixed plate, and then starting the micro air pump, the negative pressure airflow is delivered to the inside of the suction cup, which satisfies the adsorption and fixation of the threaded post. The drill rod body to be inspected is placed on the support device, and then by aligning the end of the drill rod body with the threaded post, the fixed plate is rotated by the rotary motor, which satisfies the rotation of the threaded post and the threaded connection between the threaded post and the drill rod body, thus realizing the connection and fixation of the drill rod body.

[0008] Furthermore, four sliding grooves are arranged in a circle at the center of the other side wall of the fixed disk, and four arc-shaped grooves are arranged in a circle near the center of the outer side of the connecting threaded column. An arc-shaped block is fitted inside the center of each of the four arc-shaped grooves. Four connecting blocks are arranged in a circle at the center of the inside of the fixed disk, and four bolts are arranged in a circle at the center of the outer side of the fixed disk. The four bolts pass through the fixed disk and extend into the inside of the fixed disk, and are rotatably connected to the four connecting blocks through bearings.

[0009] Through the above technical solution, the operator controls the rotation of the bolt to allow the connecting block to slide within the groove, and also enables the arc-shaped block to be fitted with the arc-shaped groove, thus meeting the requirements for clamping and fixing the connecting threaded column. This achieves double fixing, thereby improving its stability and facilitating quick installation, removal, and replacement by the operator. It also allows for the replacement and adaptation of the connecting threaded column according to different diameter drill rod bodies, improving the equipment's versatility and flexibility, and thus enhancing its practicality.

[0010] Furthermore, the four connecting blocks pass through the four sliding grooves to the outside of the four sliding grooves and are slidably connected to the four sliding grooves respectively. The four connecting blocks are fixedly connected to the four arc-shaped blocks respectively, and the four bolts are threadedly connected to the fixed plate respectively.

[0011] Through the above technical solution, the connecting block passes through and slides with the slide groove, and is fixedly connected to the arc block, thus meeting the requirement to move the arc block. Furthermore, the threaded connection between the bolt and the fixed plate makes it convenient for workers to adjust the movement and clamping force of the arc block.

[0012] Furthermore, the support device on one side includes a hydraulic cylinder, which is located on the upper surface of the support base. A semi-circular support plate is provided at the output end of the hydraulic cylinder. A square groove is provided at the center of the inner wall of the semi-circular support plate. A roller is provided at the upper center of the square groove. A rotating shaft is provided at both ends of the roller. The two rotating shafts are rotatably connected to the two inner walls of the square groove through bearings. An anti-wear layer is sleeved at the center of the outer side of the roller.

[0013] The above technical solution involves placing the drill rod body requiring flaw detection on a semi-circular support plate. A hydraulic cylinder, activated according to the different diameters of the drill rod body, moves the drill rod body up and down to align with the connecting device, facilitating connection. This improves the ease of connection. A rotating shaft allows the rollers to rotate freely within a square groove, and their rotational movement at the contact point with the drill rod body supports the weight of the drill rod and allows for free rotation, maintaining stability during flaw detection and improving accuracy and reliability. Furthermore, an anti-wear layer reduces friction and wear between the rollers and the drill rod body, thus lowering frictional force.

[0014] Furthermore, the wear-resistant layer is made of polytetrafluoroethylene;

[0015] The above technical solution uses polytetrafluoroethylene (PTFE) as the material for the wear-resistant layer, giving it a low coefficient of friction, which effectively reduces the friction between the roller and the drill pipe body.

[0016] Furthermore, the two slide rail structures are slidably connected to the support block via slide rails, and the threaded rod passes through one side wall of the fixed plate to the other side wall of the fixed plate, and is threadedly connected to the threaded hole;

[0017] The above technical solution, through the threaded connection between the threaded rod and the threaded hole, enables the horizontal movement of the rotary motor and the support block during the rotation of the threaded rod driven by the rotary motor. Furthermore, the slide rail structure and the support block are slidably connected, thus satisfying the movement requirements of the support block.

[0018] Furthermore, a flaw detection device body is provided at the center of the upper end face of the support base near the other end, and a control panel is provided at the center of the front end face of the flaw detection device body;

[0019] Through the above technical solution, when the drill pipe body moves and rotates past the flaw detection device body, the sensors in the flaw detection device body start working to perform a comprehensive inspection of the drill pipe body. The signals collected by the sensors are then analyzed by the signal processing module to identify defects inside and on the surface of the drill pipe. This solution is a commonly used technical method in the existing technology and will not be elaborated on here. The control panel realizes the start-up and control of the equipment through the human-machine interface and electrical control system. The input signal processing converts the operator's instructions into electrical signals, and the output signal transmission transmits the control signals to each actuator to realize equipment control. The main controller ensures the normal start-up of the micro air pump, hydraulic cylinder and rotary motor through synchronous control algorithms, such as the synchronous output function of PLC or the synchronous instructions of servo controller. It can also transmit the detection and analysis results of the flaw detection device body to the control panel for display and recording through the data interface. This is a commonly used technical method in the existing control system and will not be elaborated on here.

[0020] This utility model has the following beneficial effects:

[0021] 1. In this utility model, when the flaw detection device for oil drill pipe is used, the connecting threaded column contacts the other side wall of the fixed plate, and then the micro air pump is started to deliver negative pressure airflow into the suction cup, which satisfies the adsorption and fixation of the connecting threaded column. The operator controls the rotation of the bolt to satisfy the sliding connection of the connecting block in the slide groove, and can drive the arc block to be sleeved and connected with the arc groove, which satisfies the requirements for clamping and fixing the connecting threaded column, realizing double fixation, thereby improving its stability, and facilitating the operator to quickly install, disassemble and replace it. It also meets the requirement of being able to replace and adapt the connecting threaded column according to the drill pipe body of different diameters, which improves the versatility and flexibility of the equipment, thereby improving the practicality of the equipment.

[0022] 2. In this utility model, the drill rod body to be inspected is placed on a semi-circular support plate. Then, according to the different diameters of the drill rod body, the hydraulic cylinder is activated to drive the drill rod body to move up and down, so that it corresponds with the connecting device, facilitating its connection. This makes the connection of the drill rod body more convenient. Then, the roller can rotate freely in the square groove through the rotating shaft, and rotate through the contact point with the drill rod body to support the weight of the drill rod and allow it to rotate freely, so that the drill rod body remains stable during the inspection process, thereby improving the inspection accuracy and reliability. Finally, the wear-resistant layer reduces the friction and wear between the roller and the drill rod body, thereby reducing the friction force. Attached Figure Description

[0023] Figure 1 This is a perspective view of a flaw detection device for oil drill pipe proposed in this utility model;

[0024] Figure 2 This is a three-dimensional sectional view of a flaw detection device for oil drill pipe proposed in this utility model;

[0025] Figure 3 This is a three-dimensional sectional view of a connecting device for a flaw detection device for oil drill pipe proposed in this utility model;

[0026] Figure 4 This is a three-dimensional sectional view of a support device for a flaw detection device for oil drill pipe proposed in this utility model.

[0027] Legend:

[0028] 1. Support base; 2. Fixing plate; 3. Threaded hole; 4. Slide rail structure; 5. Support block; 6. Rotary motor; 7. Threaded rod; 8. Connecting device; 801. Fixing plate; 802. Slide groove; 803. Connecting threaded column; 804. Arc groove; 805. Arc block; 806. Connecting block; 807. Bolt; 808. Suction cup; 809. Miniature air pump; 9. Drill rod body; 10. Supporting device; 1001. Hydraulic cylinder; 1002. Semi-circular support plate; 1003. Square groove; 1004. Roller; 1005. Rotating shaft; 1006. Wear-resistant layer; 11. Flaw detection device body; 12. Control panel. Detailed Implementation

[0029] 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.

[0030] Reference Figure 1-4 This utility model provides an embodiment of a flaw detection device for oil drill pipe, comprising a support base 1 and a fixing plate 2. The fixing plate 2 is located at the center of the upper end face of the support base 1 on one side. A threaded hole 3 is provided at the center of one side of the fixing plate 2. Slide rail structures 4 are provided at both the front and rear sides of one side of the upper end face of the support base 1. Support blocks 5 are provided at the center of the upper end face of the two slide rail structures 4. A rotary motor 6 is provided at the center of the upper end face of the support block 5. A threaded rod 7 is provided at the output end of the rotary motor 6. A connecting device 8 is provided at the end of the threaded rod 7. A drill pipe body 9 is provided at the end of the connecting device 8. Two support devices 10 are arranged horizontally at the center of the upper end face of the support base 1 on the other side. The connecting device 8 facilitates quick installation, removal and replacement by the operator, and allows for the replacement and adaptation of the connecting threaded post 803 according to different diameter drill pipe bodies 9, thereby improving the versatility and flexibility of the equipment and enhancing its practicality.

[0031] The side support device 10 includes a hydraulic cylinder 1001, which is located on the upper surface of the support base 1. A semi-circular support plate 1002 is located at the output end of the hydraulic cylinder 1001. A square groove 1003 is located at the center of the inner wall of the semi-circular support plate 1002. A roller 1004 is located near the upper center of the square groove 1003. A rotating shaft 1005 is located at both ends of the roller 1004. The two rotating shafts 1005 are rotatably connected to the two inner walls of the square groove 1003 via bearings. An anti-wear layer 1006 is fitted onto the center of the outer side of the roller 1004. The drill rod body 9 to be inspected is placed on the semi-circular support plate 1002, and then... Different diameters of the drill rod body 9 are activated by the hydraulic cylinder 1001, which drives the drill rod body 9 to move up and down, so that it corresponds with the connecting device 8, facilitating its connection. This makes the connection of the drill rod body 9 more convenient. Then, the roller 1004 can rotate freely in the square groove 1003 through the rotating shaft 1005. It rotates through the contact point with the drill rod body 9, supporting the weight of the drill rod and allowing it to rotate freely, so that the drill rod body 9 remains stable during the flaw detection process, thereby improving the flaw detection accuracy and reliability. Furthermore, the wear-resistant layer 1006 reduces the friction and wear between the roller 1004 and the drill rod body 9, thereby reducing the friction force.

[0032] The wear-resistant layer 1006 is made of polytetrafluoroethylene (PTFE). By using PTFE as the material for the wear-resistant layer 1006, it has a low coefficient of friction, which effectively reduces the friction between the roller 1004 and the drill rod body 9.

[0033] The two slide rail structures 4 are slidably connected to the support block 5 via slide rails. The threaded rod 7 passes through one side wall of the fixed plate 2 and extends to the other side wall of the fixed plate 2, and is threadedly connected to the threaded hole 3. The threaded connection between the threaded rod 7 and the threaded hole 3 allows the rotary motor 6 to rotate and the support block 5 to move horizontally during the rotation of the threaded rod 7 driven by the rotary motor 6. The slide rail structure 4 is slidably connected to the support block 5 via slide rails, which satisfies the movement requirements of the support block 5.

[0034] A flaw detection device body 11 is located at the center of the upper surface of the support base 1, near the other end. A control panel 12 is located at the center of the front surface of the flaw detection device body 11. When the drill rod body 9 moves and rotates through the flaw detection device body 11, the sensors in the flaw detection device body 11 start working to perform all-round detection on the drill rod body 9. The signals collected by the sensors are then analyzed by the signal processing module to identify defects inside and on the surface of the drill rod. This solution is a commonly used technical means in the existing technology and will not be elaborated on here. The control panel 12 realizes the start-up and control of the equipment through the human-machine interface and the electrical control system. The input signal processing converts the operator's instructions into electrical signals, and the output signal transmission transmits the control signals to each actuator to realize equipment control. The main controller ensures the normal start-up of the micro air pump 809, hydraulic cylinder 1001 and rotary motor 6 through synchronous control algorithms, such as the synchronous output function of PLC or the synchronous instructions of servo controller. It can also transmit the detection and analysis results of the flaw detection device body 11 to the control panel 12 for display and recording through the data interface. This is a commonly used technical means in the existing control system and will not be elaborated on here.

[0035] like Figure 2 , 3 As shown, the connecting device 8 includes a fixing plate 801, which is located at the end of the threaded rod 7. A suction cup 808 is located at the center of the other side wall of the fixing plate 801, extending through the other side wall to the other inner side wall of the fixing plate 801. A miniature air pump 809 is located at the center of one inner side wall of the fixing plate 801, with its input end connected to the suction cup 808. A connecting threaded post 803 is located at the center of the other side wall of the fixing plate 801, and its outer center near the other end is threadedly connected to the drill rod body 9. By connecting the threaded post 803 to the other side wall of the fixed plate 801, and then starting the micro air pump 809, the negative pressure airflow is delivered to the inside of the suction cup 808, which satisfies the adsorption and fixation of the threaded post 803. The drill rod body 9 to be inspected is placed on the support device 10, and then the end of the drill rod body 9 is aligned with the threaded post 803. The fixed plate 801 is rotated by the rotary motor 6, which satisfies the rotation of the threaded post 803 and the threaded connection between the threaded post 803 and the drill rod body 9, thus realizing the connection and fixation of the drill rod body 9.

[0036] Four circular grooves 802 are arranged at the center of the other side wall of the fixed disk 801. Four arc-shaped grooves 804 are arranged in a circular pattern near the center of the outer side of the connecting threaded post 803. An arc-shaped block 805 is fitted inside the center of each of the four arc-shaped grooves 804. Four connecting blocks 806 are arranged in a circular pattern at the center of the interior of the fixed disk 801. Four bolts 807 are arranged in a circular pattern at the center of the outer side of the fixed disk 801. The four bolts 807 pass through the fixed disk 801 and extend into the interior of the fixed disk 801, and are rotatably connected to the four connecting blocks 806 via bearings. By controlling the rotation of bolt 807, the operator enables the connecting block 806 to slide within the groove 802, and also allows the arc-shaped block 805 to be fitted with the arc-shaped groove 804, thus fulfilling the requirement for clamping and fixing the connecting threaded post 803. This achieves double fixing, thereby improving its stability and facilitating quick installation, removal, and replacement by the operator. It also allows for the replacement and adaptation of the connecting threaded post 803 with drill rod bodies 9 of different diameters, improving the equipment's versatility and flexibility, and ultimately enhancing its practicality.

[0037] Four connecting blocks 806 pass through four sliding grooves 802 and extend to the outside of the four sliding grooves 802, and are slidably connected to the four sliding grooves 802 respectively. The four connecting blocks 806 are fixedly connected to the four arc-shaped blocks 805 respectively. The four bolts 807 are threadedly connected to the fixed plate 801 respectively. Through the penetration of the connecting blocks 806 and the sliding connection with the sliding grooves 802, and through the fixed connection between the connecting blocks 806 and the arc-shaped blocks 805, the requirement to move the arc-shaped blocks 805 is met. Furthermore, through the threaded connection between the bolts 807 and the fixed plate 801, it is convenient for the staff to adjust the movement and clamping force of the arc-shaped blocks 805.

[0038] Working principle: When using the flaw detection device for oil drill pipe, the drill pipe body 9 to be inspected is placed on the semi-circular support plate 1002. Then, according to the different diameters of the drill pipe body 9, the hydraulic cylinder 1001 is activated to drive the drill pipe body 9 to move up and down, so that it corresponds with the connecting device 8, facilitating its connection. This makes the connection of the drill pipe body 9 more convenient. Then, the roller 1004 can rotate freely in the square groove 1003 through the rotating shaft 1005. It rotates through the contact point with the drill pipe body 9, supporting the weight of the drill pipe and allowing it to rotate freely, so that the drill pipe body 9 remains stable during the flaw detection process, thereby improving the flaw detection accuracy and reliability. Then, the wear-resistant layer 1006 reduces the friction and wear between the roller 1004 and the drill pipe body 9, thereby reducing the friction force. The wear-resistant layer 1006 is made of polytetrafluoroethylene, which has a low coefficient of friction, effectively reducing the friction force between the roller 1004 and the drill pipe body 9.

[0039] By connecting the threaded post 803 to the other side wall of the fixed plate 801, and then starting the micro air pump 809, negative pressure airflow is delivered to the suction cup 808, which satisfies the adsorption and fixation of the threaded post 803. The operator controls the bolt 807 to rotate, which satisfies the sliding connection of the connecting block 806 in the slide groove 802, and can drive the arc block 805 to be sleeved and connected with the arc groove 804, which satisfies the clamping and fixing connection requirements of the threaded post 803, and achieves double fixation, thereby improving its stability and facilitating the operator to quickly install, remove and replace it. It also satisfies the requirement to replace and adapt the threaded post 803 according to the drill rod body 9 of different diameters, which improves the versatility and flexibility of the equipment, thereby improving the practicality of the equipment. Then, the rotary motor 6 drives the fixed plate 801 to rotate, which satisfies the rotation of the threaded post 803 and the threaded connection between it and the drill rod body 9, thus realizing the connection and fixation of the drill rod body 9.

[0040] The threaded connection between the threaded rod 7 and the threaded hole 3 allows the rotary motor 6 to rotate while driving the threaded rod 7, enabling the horizontal movement of the rotary motor 6 and the support block 5. Furthermore, the slide rail structure 4 and the support block 5 are slidably connected via the slide rail, thus satisfying the movement requirements of the support block 5.

[0041] When the drill pipe body 9 moves and rotates through the flaw detection device body 11, the sensors in the flaw detection device body 11 start working to perform all-round detection on the drill pipe body 9. The signals collected by the sensors are then analyzed by the signal processing module to identify defects inside and on the surface of the drill pipe. This solution is a commonly used technical method in the prior art, and will not be elaborated on here.

[0042] The control panel 12 enables the startup and control of the equipment through a human-machine interface and an electrical control system. Input signal processing converts the operator's instructions into electrical signals, and output signal transmission transmits control signals to each actuator to achieve equipment control. The main controller ensures the normal startup of the micro air pump 809, hydraulic cylinder 1001, and rotary motor 6 through synchronous control algorithms, such as the synchronous output function of a PLC or the synchronous instructions of a servo controller. It can also transmit the detection and analysis results of the flaw detection device body 11 to the control panel 12 for display and recording through a data interface. This is a commonly used technical means in existing control systems and will not be elaborated on here.

[0043] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A flaw detection device for oil drill pipe, comprising a support base (1) and a fixing plate (2), wherein the fixing plate (2) is disposed on one side of the center of the upper end face of the support base (1), characterized in that: The fixed plate (2) has a threaded hole (3) at the center of one side. The support base (1) has a slide rail structure (4) at the front and back of one side of the upper end face. The two slide rail structures (4) have a support block (5) at the center of the upper end face. The support block (5) has a rotary motor (6) at the center of the upper end face. The rotary motor (6) has a threaded rod (7) at the output end. The threaded rod (7) has a connecting device (8) at the end. The connecting device (8) has a drill rod body (9) at the end. The support base (1) has two support devices (10) arranged horizontally at the center of the upper end face on the other side. The connecting device (8) includes a fixed plate (801), which is located at the end of the threaded rod (7). A suction cup (808) is provided at the center of the other side wall of the fixed plate (801). The suction cup (808) passes through the other side wall of the fixed plate (801) and extends to the other inner side wall of the fixed plate (801). A micro air pump (809) is provided at the center of one inner side wall of the fixed plate (801). The input end of the micro air pump (809) is connected to the suction cup (808). A connecting threaded post (803) is provided at the center of the other side wall of the fixed plate (801). The outer center of the connecting threaded post (803) is threadedly connected to the drill rod body (9) at the other end.

2. The flaw detection device for oil drill pipe according to claim 1, characterized in that: The fixed disk (801) has four circular grooves (802) arranged at the center of the other side wall. The connecting threaded column (803) has four circular arc grooves (804) arranged on one side of the outer center. Each of the four arc grooves (804) has an arc block (805) fitted inside the center. The fixed disk (801) has four connecting blocks (806) arranged in a circle at the center of the inside. The fixed disk (801) has four bolts (807) arranged in a circle at the center of the outer side. The four bolts (807) pass through the fixed disk (801) and extend into the interior of the fixed disk (801), and are rotatably connected to the four connecting blocks (806) through bearings.

3. The flaw detection device for oil drill pipe according to claim 2, characterized in that: The four connecting blocks (806) pass through the four slide grooves (802) and extend to the outside of the four slide grooves (802), and are slidably connected to the four slide grooves (802) respectively. The four connecting blocks (806) are fixedly connected to the four arc blocks (805) respectively, and the four bolts (807) are threadedly connected to the fixed plate (801) respectively.

4. The flaw detection device for oil drill pipe according to claim 1, characterized in that: The support device (10) on one side includes a hydraulic cylinder (1001), which is located on the upper surface of the support base (1). A semi-circular support plate (1002) is provided at the output end of the hydraulic cylinder (1001). A square groove (1003) is provided at the center of the inner sidewall of the semi-circular support plate (1002). A roller (1004) is provided at the upper center of the square groove (1003). A rotating shaft (1005) is provided at both ends of the roller (1004). The two rotating shafts (1005) are rotatably connected to the two inner sidewalls of the square groove (1003) through bearings. An anti-wear layer (1006) is sleeved at the center of the outer side of the roller (1004).

5. The flaw detection device for oil drill pipe according to claim 4, characterized in that: The wear-resistant layer (1006) is made of polytetrafluoroethylene.

6. The flaw detection device for oil drill pipe according to claim 1, characterized in that: The two slide rail structures (4) are slidably connected to the support block (5) via the slide rail. The threaded rod (7) passes through one side wall of the fixed plate (2) and extends to the other side wall of the fixed plate (2), and is threadedly connected to the threaded hole (3).

7. The flaw detection device for oil drill pipe according to claim 1, characterized in that: The support base (1) has a flaw detection device body (11) at the center of the upper end near the other end, and a control panel (12) is provided at the center of the front end of the flaw detection device body (11).

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