Automatic center exposure device for X-ray detection

Abstract

The utility model relates to the technical field of petrochemical pipeline welding seam detection, in particular to an automatic center exposure device for X-ray detection, which comprises a bracket, an X-ray machine and a plurality of groups of telescopic frames, the bracket is cylindrical, and the X-ray machine is arranged at the center of the end part of the bracket; the telescopic frames are distributed in the circumferential direction of the bracket, each telescopic frame comprises a lead screw arranged in parallel to the axial direction of the bracket, a first motor installed on the bracket and used for driving the lead screw to rotate, two sliding tables arranged outside the lead screw in a sleeving mode, a first arm body and a second arm body, the first arm body and the second arm body are arranged in an X shape, and the inner end of the first arm body and the inner end of the second arm body are hinged to the two sliding tables respectively; the first motor drives the lead screw to rotate to drive the two sliding tables to get close to or away from each other. The displacement assembly is used for driving the whole exposure device to move along the axial direction of the detected pipeline. Compared with the prior art, the device is suitable for rapid centering focusing X-ray detection of the pipeline welding seam, the application range is wide, the center focusing time of an X-ray machine is shortened, and the detection efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of petrochemical pipeline weld inspection technology, specifically to an automated X-ray inspection center exposure device. Background Technology

[0002] X-ray machines generate X-rays through an X-ray tube. Inside the tube are a cathode and an anode. The cathode emits electrons, which, under high voltage, fly at high speed towards the anode. When these electrons collide with the anode target, some of their energy is converted into X-ray energy, thus emitting an X-ray beam. This beam is directed at the object being inspected. Different materials have varying penetration capabilities for X-rays, and even for the same material, different thicknesses and densities result in varying degrees of attenuation after X-ray penetration. Generally, denser and thicker parts attenuate X-rays more strongly, and vice versa. Because different parts of the object attenuate X-rays differently, the intensity of the X-rays reaching the film varies, resulting in images of different gray levels on the film. This allows for the observation of the object's internal structure, defects, and other characteristics.

[0003] Currently, X-ray inspection centers typically use a central exposure device to center the X-ray machine. A crawler then pulls the central exposure device. When the X-ray machine reaches the designated position, it stops moving and begins its work to inspect pipe welds.

[0004] Current X-ray inspection center exposure devices cannot quickly center the X-ray machine, resulting in low inspection efficiency. If the X-ray machine cannot be centered, the attenuation varies at different locations from the X-ray machine's focal point to the pipe weld, leading to differences in the intensity of the radiation reaching the film and consequently, defective film.

[0005] The current central exposure device for X-ray inspection cannot guarantee the exposure position of the X-ray machine. As a result, the X-ray machine's radiation window is not directly facing the pipe weld, and thus the X-ray irradiation feedback information cannot be obtained, leading to the scrapping of the film.

[0006] Currently, the central exposure device for X-ray inspection cannot achieve remote control of the automatic movement of the central exposure device, thus failing to achieve automated inspection and resulting in relatively low inspection efficiency. Summary of the Invention

[0007] In view of the above-mentioned technical problems existing in the prior art, the present invention provides an automated central exposure device for X-ray detection.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] An automated central exposure device for X-ray inspection is provided, including a bracket, an X-ray machine, and multiple sets of telescopic frames. The bracket is cylindrical, and the X-ray machine is installed at the center of the end of the bracket.

[0010] Multiple telescopic frames are distributed circumferentially around the bracket. Each telescopic frame includes a lead screw arranged parallel to the axial direction of the bracket, a first motor installed on the bracket for driving the lead screw to rotate, two slides sleeved on the lead screw, and a first arm and a second arm arranged in an X shape. The middle parts of the first arm and the second arm are hinged to each other. The inner ends of the first arm and the second arm are respectively hinged to the two slides. At least one slide is threaded to the lead screw so that the first motor driving the lead screw to rotate can drive the two slides to move closer or further apart.

[0011] It also includes a displacement component that drives the entire exposure device to move axially along the pipe being tested.

[0012] As a further alternative, the outer ends of the first and second arms are respectively provided with rollers for abutting against the inner wall of the pipe being measured.

[0013] As a further alternative, the shifting assembly includes a second motor mounted on the first arm and / or the second arm for driving the rotation of the wheel.

[0014] As a further alternative, the outer ends of the first and second arms are fixed with U-shaped brackets, and the rotating wheel is rotatably mounted on the brackets via a pivot pin.

[0015] As a further alternative, the first and second motors are stepper motors.

[0016] As a further alternative, the two slides are threadedly engaged with the lead screw, and the threads engaged by the two slides and the lead screw are opposite.

[0017] As a further alternative, one slide is limited in the length direction of the lead screw, and the other slide is threaded into the lead screw.

[0018] As a further optional feature, the bracket is also equipped with a positioning module, which includes two laser emitters and a camera.

[0019] As a further alternative, a motor bracket is provided at the end of the bracket, and the first motor is mounted on the motor bracket.

[0020] As a further alternative, the three sets of telescopic frames are evenly distributed around the bracket in the circumference.

[0021] The beneficial effects of this utility model are:

[0022] This utility model provides an automated central exposure device for X-ray inspection, which, compared with the prior art, has the following advantages:

[0023] (1) It is suitable for X-ray inspection of pipe welds with rapid centering and focusing. It has a wide range of applications, reduces the center focusing time of the X-ray machine, and improves the inspection efficiency.

[0024] (2) To achieve precise positioning of the X-ray machine's radiation window, reduce the occurrence of unqualified films due to incorrect placement of the X-ray machine, and save on testing costs;

[0025] (3) Enables remote control of automated X-ray inspection, eliminating the need for multiple screenings and improving inspection efficiency. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of an automated central exposure device for X-ray inspection in one of the embodiments.

[0027] Figure 2 This is a schematic diagram of the positioning module in the embodiment.

[0028] Figure label:

[0029] Bracket 1, X-ray machine 2;

[0030] Telescopic frame 3, lead screw 31, first motor 32, slide table 33, first arm body 34, second arm body 35, rotating wheel 36, and card seat 37;

[0031] 4. Second motor; 5. Motor bracket; 6. Positioning module. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0033] This embodiment provides an automated central exposure apparatus for X-ray inspection, such as... Figure 1As shown, the device includes a bracket 1, an X-ray machine 2, and multiple sets of telescopic frames 3. The bracket 1 is cylindrical, and the X-ray machine 2 is installed at the center of the end of the bracket 1. The three sets of telescopic frames 3 are evenly distributed around the circumference of the bracket 1. Each set of telescopic frames 3 includes a lead screw 31 arranged parallel to the axial direction of the bracket 1, a first motor 32 installed on the bracket 1 for driving the lead screw 31 to rotate, two slides 33 sleeved on the lead screw 31, and a first arm 34 and a second arm 35 of equal length arranged in an X-shape. The middle parts of the first arm 34 and the second arm 35 are hinged to each other by a pin. The inner ends of the first arm 34 and the second arm 35 are respectively hinged to the two slides 33. At least one slide 33 is threaded to the lead screw 31 so that the first motor 32 can drive the lead screw 31 to rotate and drive the two slides 33 to move closer or further apart, thereby enabling the telescopic frame 3 to shrink and expand, allowing the telescopic frame 3 to quickly fit against the inner wall of the pipe being tested, thus achieving the centered placement of the X-ray machine 2. The first motor 32 of the three sets of telescopic frames 3 works synchronously.

[0034] In this embodiment, the outer ends of the first arm 34 and the second arm 35 are respectively provided with rotating wheels 36 for abutting against the inner wall of the pipe being tested. It also includes a displacement assembly that drives the entire exposure device to move axially along the pipe being tested. The displacement assembly includes a second motor 4 installed on the first arm 34 and / or the second arm 35 for driving the rotating wheels 36 to rotate, enabling remote control of the entire device's forward and backward movement. During inspection, the inspector pre-places X-ray films on multiple circumferential welded joints of the pipe (for the device's movement sensing and positioning). After the inspector leaves the site, the exposure device is moved remotely via a central control system, allowing the X-ray machine 2 to continuously irradiate the pipe, achieving automated X-ray inspection without the need for multiple film placements, thus improving inspection efficiency.

[0035] In this embodiment, the first motor 32 and the second motor 4 are stepper motors. The overall movement or the expansion and contraction of the telescopic frame 3 is controlled by the start / stop / forward / reverse rotation of the stepper motors through an external controller. The motor control technology is prior art and will not be described in detail here. A motor bracket 5 is provided at the end of the bracket 1, and the first motor 32 is mounted on the motor bracket 5.

[0036] Compared with existing technologies, this device is suitable for rapid and centered X-ray inspection of weld seams in pipes with a diameter greater than 500mm. It has a wide range of applications, reduces the centering time of the X-ray machine 2, and improves inspection efficiency. It also enables precise positioning of the X-ray machine 2's radiation window, reducing the occurrence of unqualified films due to incorrect placement of the X-ray machine 2, thus saving inspection costs. Furthermore, it enables remote-controlled automated X-ray inspection, eliminating the need for multiple film placements and improving inspection efficiency.

[0037] In this embodiment, the outer ends of the first arm body 34 and the second arm body 35 are fixed with U-shaped card seats 37, and the rotating wheel 36 is rotatably mounted on the card seats 37 via a shaft pin.

[0038] In this embodiment, one slide 33 is limited along the length of the lead screw 31 (i.e., it does not move back and forth with the rotation of the lead screw 31, nor does it rotate with the lead screw 31), while the other slide 33 is threaded into the lead screw 31. When the lead screw 31 rotates, it drives this slide 33 to move back and forth. In practice, it can be modified so that the two slides 33 are threaded into the lead screw 31 respectively, and the threads of the two slides 33 and the lead screw 31 are opposite, which can also make the two slides 33 move closer or further apart.

[0039] In this embodiment, the bracket 1 is further provided with a positioning module 6, which includes two laser emitters and a camera, wherein the camera is a wireless camera. Figure 2 As shown, during use, the emission angles of the two laser beams A emitted by the two lasers on the positioning module 6 are manually adjusted so that the focal point B of the two laser beams A falls precisely on the perpendicular point of the X-ray machine 2's radiation window on the workpiece. The camera on the positioning module 6 observes whether the focal point B of the two laser beams A is on the area to be inspected, thus determining whether the central exposure device has moved into position. When the inspector observes through the wireless camera that the focal point B of the two laser beams A has not yet fallen on the center of the weld, the second motor 4 is remotely controlled to move the entire device back and forth until the focal point of the two laser beams falls on the center of the weld, indicating that the automated X-ray central exposure device has moved into position.

[0040] In the description of this utility model, it is obvious that the described embodiments are only a part of the embodiments of this utility model, and not all of them. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0041] Therefore, the above detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0042] In the description of this utility model, it should be noted that the terms "middle," "upper," "lower," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0043] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

Claims

1. An X-ray detection automation center exposure apparatus, characterized by: The exposure device comprises a bracket, a radiographic machine and a plurality of telescopic frames, the bracket is cylindrical, and the radiographic machine is installed at the center of the end of the bracket; The plurality of telescopic frames are distributed around the circumference of the bracket, each telescopic frame comprises a screw rod arranged axially parallel to the bracket, a first motor installed on the bracket for driving the screw rod to rotate, two sliding tables sleeved on the screw rod, a first arm body and a second arm body arranged in an X shape, the middle portions of the first arm body and the second arm body are hingedly connected to each other, the inner ends of the first arm body and the second arm body are respectively hingedly connected to the two sliding tables, and at least one sliding table is threadedly connected to the screw rod, so that the rotation of the screw rod driven by the first motor can drive the two sliding tables to move close to or away from each other. The exposure device further comprises a displacement assembly for driving the whole exposure device to move axially along the pipeline to be detected.

2. An X-ray detection automated central exposure apparatus according to claim 1, characterized in that: The outer ends of the first arm body and the second arm body are respectively provided with a runner for abutting against the inner wall of the pipeline to be detected.

3. An X-ray detection automated central exposure apparatus according to claim 2, characterized in that: The displacement assembly comprises a second motor installed on the first arm body and / or the second arm body for driving the runner to rotate.

4. An X-ray detection automated central exposure apparatus according to claim 3, characterized in that: The outer ends of the first arm body and the second arm body are fixed with a U-shaped clamping seat, and the runner is rotatably installed on the clamping seat via a shaft pin.

5. An X-ray detection automated central exposure apparatus according to claim 3, characterized in that: The first motor and the second motor are step motors.

6. An X-ray detection automated central exposure apparatus according to claim 1, characterized in that: The two sliding tables are respectively threadedly matched with the screw rod, and the threads matched by the two sliding tables and the screw rod are opposite.

7. An X-ray detection automated central exposure apparatus according to claim 1, characterized in that: One of the sliding tables is limited in the length direction of the screw rod, and the other sliding table is threadedly matched with the screw rod. The bracket is further provided with a positioning module, and the positioning module comprises two laser emitters and a camera.

8. An X-ray detection automated central exposure apparatus according to claim 1, characterized in that: The end of the bracket is provided with a motor support, and the first motor is installed on the motor support.

9. An X-ray detection automated central exposure apparatus according to claim 1, characterized in that: The three telescopic frames are uniformly distributed around the circumference of the bracket.

10. An X-ray detection automated central exposure apparatus according to claim 1, characterized in that: ​

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