CN107389706B - Visual thick wall metal pipeline welded joint gamma source central transillumination positioning device - Google Patents
Visual thick wall metal pipeline welded joint gamma source central transillumination positioning device Download PDFInfo
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- CN107389706B CN107389706B CN201710595087.5A CN201710595087A CN107389706B CN 107389706 B CN107389706 B CN 107389706B CN 201710595087 A CN201710595087 A CN 201710595087A CN 107389706 B CN107389706 B CN 107389706B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/12—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to investigating the properties, e.g. the weldability, of materials
- B23K31/125—Weld quality monitoring
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Abstract
The invention discloses a visual gamma source central transillumination positioning device for a thick-wall metal pipeline welding joint, which is characterized in that: comprises a positioning bracket unit, a gamma source containing and conveying positioning unit and a video transmission and positioning unit; the positioning support unit comprises a front combined type support frame, a rear combined type support frame and a connection structure between supports; the gamma source accommodating, conveying and positioning unit is arranged in a hollow channel arranged in the positioning support unit, and the video transmission and positioning unit is arranged at the front end of the positioning support unit. The invention has the following beneficial effects: the negative film has good blackness and sensitivity, small influence of scattered rays and high defect detection rate. The device is not influenced by any station in the detection of the welding seam of the industrial pipeline welding joint, and after the transilluminator is used, the transilluminator time is greatly shortened, and the operating efficiency is obviously improved.
Description
Technical Field
The invention relates to a multi-elbow connected metal pipeline welding joint gamma source central transillumination technology, in particular to a visual thick-wall metal pipeline welding joint gamma source central transillumination positioning device.
Background
Flaw detection, also called "non-destructive testing", is a technique for inspecting metal surfaces and welded joints for the presence of defects. The internal defects of the general welding joint comprise air holes, cracks, slag, incomplete penetration, incomplete fusion and the like. Common non-destructive inspection methods for internal defects of welded joints include ultrasonic inspection (ultrasonic inspection and TOFD), and radiation inspection (X-ray and gamma-ray). The X-ray or gamma ray is used to penetrate through the weld metal and the photographic negative is used for exposure, and the image is used as photographic negative, so that it can be checked at any time, just like X-ray for human body. The pipeline welding joint in the general industrial device needs to be subjected to ray detection according to the requirements of design files, and nondestructive inspection data needs to be kept and filed.
With the requirement that high-pressure thick-wall metal pipelines are used as medium conveying channels in domestic large industrial devices, such as high-pressure hydrogenation devices in the refining industry, steam turbine generator sets in the power industry, nuclear power devices and the like, the welding quality of the pipelines directly relates to the reliability of transportation. As novel equipment for detecting the quality of welding seams, the research and application of pipeline detection equipment become hot spots of research at home and abroad.
Disclosure of Invention
The invention aims to solve the technical problem of providing a visual thick-wall metal pipeline welding joint gamma source central transillumination positioning device, which can realize visual accurate positioning during the transillumination of the gamma source of the metal pipeline welding joint connected by multiple bends so as to solve the problems of low work efficiency and unstable quality of large thick-wall metal pipeline radiographic inspection in industrial devices.
In order to solve the technical problems, the invention adopts the following technical scheme:
visual thick wall metal pipeline welded joint gamma source center transillumination positioner includes: the device comprises a positioning support unit, a gamma source accommodating and conveying positioning unit and a video transmission and positioning unit;
the gamma source accommodating, conveying and positioning unit is arranged in a hollow channel arranged in the positioning bracket unit, and the video transmission and positioning unit is arranged at the front end of the positioning bracket unit;
the positioning support unit comprises a front combined type support frame, a rear combined type support frame and a connection structure between supports; the front combined type supporting frame comprises a cavity type supporting middle body, three supporting arms arranged on the cavity type supporting middle body and double-roller-group mechanisms respectively arranged at the front ends of the three supporting arms; the rear combined type supporting frame also comprises a cavity type supporting middle body, three supporting arms arranged on the cavity type supporting middle body and double-roller-group mechanisms respectively arranged at the front ends of the three supporting arms; the double-roller-group mechanism comprises a roller connecting piece, a front roller and a rear roller which is in the same direction as the front roller; the roller connecting piece is connected to the front end of the supporting arm and is respectively connected with the front roller and the rear roller;
the cavity type support middle body is of a hollow cavity type structure, and a hydraulic oil cavity is arranged in the cavity;
the inter-bracket connecting structure comprises a universal joint mechanism, a universal joint connecting pipe and a connecting end head; at least one universal joint mechanism, at least one universal joint connecting pipe and at least one connecting end socket are arranged;
the connecting end is hollow, one end of the connecting end is connected with the front combined type supporting frame or the rear combined type supporting frame, and the other end of the connecting end is connected with the universal joint connecting pipe;
the universal joint connecting pipe is hollow, one end of the universal joint connecting pipe is connected to the connecting end, and the other end of the universal joint connecting pipe is provided with a universal joint connecting and fixing mechanism for connecting a universal joint mechanism;
the inner part of the universal joint mechanism is of a hollow structure, one end of the universal joint mechanism is a rotating joint, the rotating joint is rotatably fixed on the universal joint connecting and fixing mechanism, and the other end of the universal joint mechanism is connected with either the rear combined type support frame or the front combined type support frame or is connected with the other universal joint connecting pipe and is connected with the rear combined type support frame or the front combined type support frame through a second connecting end;
the hollow part of the connection structure between the brackets and the hollow part of the cavity type support middle body form a hollow channel arranged on the positioning bracket unit and used as a gamma source output channel;
the gamma source containing and conveying positioning unit comprises a source conveying pipe, a source positioning pipe and a steel strand, wherein the source conveying pipe is arranged in a source conveying channel at the center of a connecting structure between the cavity type support middle body and the bracket, the source positioning pipe is arranged at the top end of the source conveying channel, the gamma source is arranged at the front end of the steel strand, and the gamma source is positioned in the source positioning pipe by the steel strand through the source conveying pipe; the gamma source enters the rear combined type support frame, the inter-support connecting structure and the front combined type support frame through the source conveying pipe in sequence, and is locked after reaching the source positioning pipe;
the video transmission and positioning unit comprises a light emitting unit and a camera shooting unit; the light emitting unit comprises a fixing mechanism, a rotary adjusting mechanism and a light emitting mechanism; the fixing mechanism is used for fixing the whole light emitting unit at the front end of the combined type supporting frame; the rotary adjusting mechanism is respectively connected with the fixing mechanism and the light emitting mechanism and used for adjusting the light emitting direction of the light emitting mechanism and controlling the light to irradiate at or near the welding seam; the light emitting mechanism is used for emitting linear light;
the camera shooting unit also comprises a fixing mechanism, a rotation adjusting mechanism, a camera shooting sensor and a display mechanism; the fixing mechanism is used for fixing the camera sensor at the front end of the combined type supporting frame; the rotary adjusting mechanism is respectively connected with the fixing mechanism and the camera sensor and used for adjusting the visual angle of the camera sensor; the display mechanism displays an output result of the image sensor.
More specifically, the three support arms are telescopic support arms, and each telescopic support arm comprises a telescopic rod with adjustable length, a telescopic rod locking mechanism and a connecting mechanism with the cavity type support middle body; the telescopic rod locking mechanism is used for fixing the preset extension length of the telescopic rod; the connecting mechanism is used for connecting the supporting arm with the cavity type supporting middle body.
The three supporting arms comprise a hydraulic supporting arm and two preset supporting arms, the three supporting arms are connected to the cavity type supporting middle body in an angle of 120 degrees, and a hydraulic oil cavity is arranged in the middle of the cavity type supporting middle body; the hydraulic support arm comprises a connecting piece and a hydraulic rod, the hydraulic rod is connected with the hydraulic oil cavity, and the connecting piece is used for connecting the hydraulic rod and the double-roller-group mechanism; the length is adjusted by providing the pressure required by the support arm to stretch by an external hydraulic pump. More specifically, the connecting piece includes telescopic link and the coupling mechanism of adjustable length, and the length of telescopic link is predetermine the back according to the pipeline diameter of examining and is confirmed through telescopic link locking mechanical system. More specifically, two preset support arms include telescopic link, telescopic link locking mechanical system, and double-roller group mechanism sets up in the telescopic link front end.
More specifically, the video transmission and positioning unit is located above or below the gamma source working position and close to one side of the positioning support unit. Therefore, the light emitting unit and the camera unit can be prevented from blocking the transillumination of the gamma source rays, so that the detection of the whole joint can be completed by one-time central transillumination.
More specifically, the gamma source accommodating, conveying and positioning unit further comprises a steel strand positioning device, the gamma source is fixed at the front end of the steel strand, and the middle part or the rear end of the steel strand is fixed on the steel strand positioning device; the steel strand positioning device is arranged at the opening of the detected pipeline and comprises a pipe orifice fixing mechanism and a steel strand locking mechanism; the steel strand locking mechanism is positioned in the middle of the pipe orifice fixing mechanism, and the pipe orifice fixing mechanism comprises an upper pipe orifice fastening device and a lower pipe orifice fastening device and is used for being fixed at the pipe orifice of the detected pipeline. More specifically, a connecting plate or a connecting pipe is arranged in the middle of the pipe orifice fixing mechanism, and the steel strand locking mechanism is arranged in the middle of the pipe orifice fixing mechanism through the connecting plate or the connecting pipe.
More specifically, the steel strand locking mechanism comprises pressing plates and fastening bolts, and the steel strands are pressed between the pressing plates through the fastening bolts.
Further specifically, the visual thick-wall metal pipeline welding joint gamma source central transillumination positioning device can further comprise a hydraulic device; the hydraulic device is connected with a hydraulic oil cavity of the cavity type support middle body through a flexible hose to provide power for the hydraulic telescopic arm. More specifically, the hydraulic device is provided with pressure monitoring and a quick shut-off valve.
Further specifically, the light emitting mechanism is a linear infrared emitter, and the camera sensor is a wide-angle camera.
Further specifically, the double-roller-group mechanism is arranged on the supporting arms, the front rollers and the rear rollers are not only positioned on the same straight line, but also are in the same direction with the axis direction of the pipeline, and the front rollers and the rear rollers of each supporting arm are in double-point contact with the inner wall of the pipeline to be detected. Therefore, the device can be ensured to be in concentric motion with the pipeline all the time in the positioning process, the supporting arm does not deflect forwards and backwards, and the gamma source can be accurately positioned at the center of the detected welding joint.
The inter-bracket connecting structure of the positioning bracket unit can be arranged between the front and rear combined type supporting frames to meet the passing ability in a pipeline system with a single elbow and multiple elbows connected with a small curvature radius respectively and meet the detection requirements of the prefabricated pipe section, the horizontal pipeline and the vertical pipeline in an online installation pipeline. The minimum passing curvature radius of the single elbow and the multiple elbows can reach 1.5D, wherein D is the nominal diameter of the pipeline and the same applies below.
The gamma source conveying pipe is designed in the center of the whole positioning bracket unit, and has the function that in operation, the gamma source conveying steel strand is connected with the device and sends a gamma source to the source positioning pipe at the end part of the whole device through the source conveying pipe; the gamma source transmission pipe is arranged in the center of the cavity body type support middle body, the cavity body is a liquid transmission and storage cavity body, and liquid provided by the external hydraulic unit is transmitted to the cavity body through a pipeline and is transmitted to the telescopic supporting arm connected with the cavity body, so that the positioning of different pipelines is realized.
The three support arms of the front combined type support frame and the rear combined type support frame have the same structural principle and respectively comprise two preset support arms and a hydraulic support arm, wherein the two preset support arms are used for adjusting the suitable extension length according to the pipe diameter and are fixed through a telescopic rod locking mechanism at the end part of the two preset support arms, and the longitudinal central line of the double rollers at the end part of each support arm is adjusted to be parallel to the central line of the device, so that the double rollers are always in linear contact with the pipe wall when the device slides in the pipeline, and the device is always positioned in the center of the pipeline and is kept stable; the extension and retraction of the other hydraulic supporting arm are realized through hydraulic pressure, liquid with the maximum pressure of 0.6MPa is provided for the hydraulic supporting arm through an external hydraulic unit, once the transillumination center is determined, the hydraulic supporting arm props against the inner wall of the pipe and always locks output pressure, and double rollers at the end part of the supporting arm automatically return to be parallel to the center of the device and keep the same under the action of pressure, so that the stability and the positioning of the whole device are realized.
The video transmission and positioning unit can predetermine the angle of light transmitter and camera sensor according to the pipe diameter, and linear infrared emitter is selected to the light transmitter for when the light source of transmission shines on the welding bead, camera sensor can catch real-time image, and will implement the monitor picture and reach outside monitor, can stop the device's propelling movement, start hydraulic unit location.
The steel strand positioning device is used for finally locking and positioning the steel strand which provides a driving force for the gamma source central transillumination positioning device of the thick-wall process pipeline welding joint, and provides a supporting force by fixing the clamping piece on the pipe orifice; and after the steel strand conveys the transillumination device to a preset position, the pressing plate is locked, and the steel strand is locked.
The linear infrared emitter described in this patent is a line type in which the irradiation surface of infrared rays is long, and is a technical concept different from a light source in which the irradiation surface is a point type light or a surface type light.
These technical solutions, including the improved technical solution and the further improved technical solution, can also be combined or combined with each other, thereby achieving better technical effects.
By adopting the technical scheme, the invention has the following beneficial effects:
the utility model discloses a visual thick wall metal pipeline welded joint gamma source central transillumination positioner can realize that big thick wall (delta 21mm reaches above) prefabricated pipeline and installation pipeline welded joint adopt central transillumination method to carry out radiographic inspection, and for double-walled single shadow transillumination, transillumination thickness homogeneous, transverse crack detection angle are 0, and film blackness, sensitivity are all good, and the scattered ray influence is little, and the defect detection rate is high. The device is not influenced by any station in the detection of the welding seam of the industrial pipeline welding joint, can realize the central transillumination detection of more than 95 percent of the welding seam, greatly shortens the transillumination time, and obviously improves the operation efficiency.
Drawings
Fig. 1 is an overall schematic view of the present patent.
Fig. 2 is an overall schematic view of the connection structure between two brackets of the present patent.
Figure 3 is a schematic view of a support arm of the present patent.
Fig. 4 is a schematic view of the inter-stent connection structure of this patent.
Fig. 5 is a schematic view of the connection structure connection between two connected stents of this patent.
FIG. 6 is a schematic connection diagram of the connection structure between the cavity type support middle body and the bracket of the patent.
In the figure, 1-a light emitting unit, 2-a camera unit, 31-a source positioning pipe, 32-a flexible hose, 41-a cavity type supporting middle body, 42-a supporting arm, 43-a double-roller-set mechanism, 44-a universal joint mechanism, 45-a universal joint connecting pipe and 46-a connecting end.
Detailed Description
The patent is further explained below with reference to the figures and examples. The scope of protection of the patent is not limited to the specific embodiments.
Example 1
As shown in the attached drawings, the visual thick-wall metal pipeline welded joint gamma source central transillumination positioning device comprises: the device comprises a positioning support unit, a gamma source accommodating and conveying positioning unit and a video transmission and positioning unit;
the gamma source accommodating, conveying and positioning unit is arranged in a hollow channel arranged in the positioning bracket unit, and the video transmission and positioning unit is arranged at the front end of the positioning bracket unit;
the positioning support unit comprises a front combined type support frame, a rear combined type support frame and a connection structure between supports; the front combined type supporting frame comprises a cavity type supporting middle body 41, three supporting arms arranged on the cavity type supporting middle body 41 and double-roller-group mechanisms 43 respectively arranged at the front ends of the three supporting arms; the rear combined support frame also comprises a cavity type support middle body 41, three support arms 42 arranged on the cavity type support middle body 41, and double-roller-group mechanisms 43 respectively arranged at the front ends of the three support arms 42.
The cavity type supporting middle body 41 is of a hollow cavity type structure, and a hydraulic oil cavity is arranged in the cavity; the three supporting arms 42 comprise a hydraulic supporting arm and two preset supporting arms, and the supporting arms 42 are mutually connected to the cavity type supporting middle body 41 in an angle of 120 degrees; a hydraulic oil cavity is arranged in the middle of the cavity type support middle body 41; the hydraulic support arm comprises a connecting piece and a hydraulic rod, the hydraulic rod is connected with the hydraulic oil cavity, the connecting piece is used for connecting the hydraulic rod and the double-roller-group mechanism 43, and the length is adjusted by providing pressure required by the extension and contraction of the support arm through an external hydraulic pump; the connecting piece comprises a telescopic rod with adjustable length and a connecting mechanism, and the length of the telescopic rod is determined by a telescopic rod locking mechanism after being preset according to the diameter of the detected pipeline; the hydraulic device is connected with a hydraulic oil cavity of the cavity type support middle body 41 through a flexible hose 32 to provide power for the hydraulic support arm; the hydraulic device is provided with a pressure monitoring and quick shut-off valve.
The inter-bracket connecting structure comprises a universal joint mechanism 44, a universal joint connecting pipe 45 and a connecting end 46; the connecting end 46 is hollow, one end of the connecting end is connected with the front combined type supporting frame, and the other end of the connecting end is connected with the universal joint connecting pipe 45; the universal joint connecting pipe 45 is hollow, one end of the universal joint connecting pipe is connected to the connecting end 46, and the other end of the universal joint connecting pipe is provided with a universal joint connecting and fixing mechanism for connecting the universal joint mechanism 44; the inner part of the universal joint mechanism 44 is a hollow structure, one end of the universal joint mechanism is a rotary joint, the rotary joint is rotatably fixed on the universal joint and connected with the fixing mechanism, and the other end of the universal joint mechanism is connected with the rear combined type support frame.
The hollow part of the inter-bracket connecting structure and the hollow part of the cavity type support middle body 41 form a hollow channel arranged in the positioning bracket unit and used as a gamma source output channel;
the gamma source containing and conveying positioning unit comprises a source conveying pipe, a source positioning pipe 31 and a steel strand, wherein the source conveying pipe is arranged in a source conveying channel at the center of a connecting structure between the cavity type support middle body 41 and the bracket, the source positioning pipe 31 is arranged at the top end of the source conveying channel, the gamma source is arranged at the front end of the steel strand, and the gamma source is positioned in the source positioning pipe 31 by the steel strand through the source conveying pipe; the gamma source enters the rear combined type support frame, the connection structure between the supports and the front combined type support frame through the source conveying pipe in sequence, and is locked after reaching the source positioning pipe 31.
The gamma source accommodating, conveying and positioning unit further comprises a steel strand positioning device, the gamma source is fixed at the front end of the steel strand, and the middle part or the rear end of the steel strand is fixed on the steel strand positioning device; the steel strand positioning device is arranged at the opening of the detected pipeline and comprises a pipe orifice fixing mechanism and a steel strand locking mechanism; the steel strand locking mechanism is positioned in the middle of the pipe orifice fixing mechanism, and the pipe orifice fixing mechanism comprises an upper pipe orifice fastening device and a lower pipe orifice fastening device and is used for being fixed at the pipe orifice of the pipeline to be detected; the middle part of the pipe orifice fixing mechanism is provided with a connecting plate or a connecting pipe, and the steel strand locking mechanism is arranged at the middle position of the pipe orifice fixing mechanism through the connecting plate or the connecting pipe; the steel strand locking mechanism comprises pressing plates and fastening bolts, and the steel strands are pressed between the pressing plates through the fastening bolts.
The video transmission and positioning unit comprises a light emitting unit and a camera shooting unit; the light emitting unit comprises a fixing mechanism, a rotary adjusting mechanism and a light emitting mechanism 11; the fixing mechanism is used for fixing the whole light emitting unit at the front end of the combined type supporting frame; the rotary adjusting mechanism is respectively connected with the fixing mechanism and the light emitting mechanism 11 and is used for adjusting the light emitting direction of the light emitting mechanism 11 and controlling light to irradiate at or near the welding seam; the light emitting mechanism 11 is used for emitting linear light.
The camera shooting unit also comprises a fixing mechanism, a rotary adjusting mechanism, a camera shooting sensor 21 and a display mechanism; the fixing mechanism is used for fixing the camera sensor 21 at the front end of the combined type supporting frame; the rotary adjusting mechanism is respectively connected with the fixing mechanism and the camera sensor 21 and is used for adjusting the visual angle of the camera sensor 21; the display means displays the output result of the image sensor 21.
The video transmission and positioning unit is positioned above or below the gamma source working position and close to one side of the positioning support unit, so that the transillumination of gamma source rays blocked by the light emitting unit and the camera unit is avoided, and the detection of the whole joint is completed by one-time central transillumination; the light emitting mechanism 11 is a linear infrared emitter, and the camera sensor 21 is a wide-angle camera.
This patent visual thick wall metal pipeline welded joint gamma source center transillumination positioner sets up two gyro wheel group mechanisms 43 on through the support arm 42, and preceding, back gyro wheel not only is located the collinear, and preceding, back gyro wheel of each support arm 42 all takes place to be two point contact with the pipeline inner wall of being examined, can guarantee that the device is in all the time at the location in-process with the pipeline concentric motion, and support arm 42 does not take place to deflect around, and the gamma source can be accurately positioned in the welded joint center of being examined.
The inter-bracket connecting structure of the positioning bracket unit is arranged between the front and rear combined type supporting frames so as to respectively meet the trafficability characteristic in a pipeline system with a single elbow and multiple elbows connected with a small curvature radius and adapt to the detection requirements of prefabricated pipe sections, horizontal pipelines and vertical pipelines on-line installation pipelines.
The gamma source conveying pipe is designed in the center of the whole positioning bracket unit, and has the function that in operation, the gamma source conveying steel strand is connected with the device and sends gamma sources into the source positioning pipe 31 at the end part of the whole device through the source conveying pipe; the gamma source pipe is arranged in the center of the cavity type support middle body 41, the cavity is a liquid transmission and storage cavity, and liquid provided by an external hydraulic unit is transmitted to the cavity through a pipeline and is transmitted to the telescopic supporting arm 42 connected with the cavity, so that the positioning of different pipelines is realized.
The design has supporting arms 42 of three specifications, the structural principle is the same, wherein, two preset supporting arms 42 of each group are used for adjusting the suitable extension length according to the pipe diameter and are fixed by a telescopic rod locking mechanism at the end part of the supporting arms, and the central line of the longitudinal row of the double rollers at the end part of the supporting arms 42 is adjusted to be parallel to the central line of the device, so that the double rollers are always kept in linear contact with the pipe wall when the device slides in the pipeline, and the device is always kept at the center of the pipeline and is kept stable; the extension and contraction of the other hydraulic supporting arm 42 are realized through hydraulic pressure, liquid with the maximum pressure of 0.6MPa is provided for the hydraulic supporting arm through an external hydraulic unit, once the transillumination center is determined, the hydraulic supporting arm 42 is tightly propped against the inner wall of the pipe and always locks output pressure, and double rollers at the end part of the supporting arm 42 automatically return to be parallel to the center of the device and keep the same under the action of the pressure, so that the stability and the positioning of the whole device are realized.
The video transmission and positioning unit can be according to the predetermined light transmitter of pipe diameter and the angle of camera sensor 21, and linear infrared emitter is selected to the light transmitter for when the light source of transmission shines on the welding bead, camera sensor 21 can catch real-time image, and will implement the monitor picture and reach outside monitor, can stop the propelling movement of device, start hydraulic unit location.
The steel strand positioning device is used for finally locking and positioning the steel strand which provides a driving force for the gamma source central transillumination positioning device of the thick-wall process pipeline welding joint, and provides a supporting force by fixing the clamping piece on the pipe orifice; and after the steel strand conveys the transillumination device to a preset position, the pressing plate is locked, and the steel strand is locked.
The utility model discloses a visual thick wall metal pipeline welded joint gamma source central transillumination positioner can realize that big thick wall (delta 21mm reaches above) prefabricated pipeline and installation pipeline welded joint adopt central transillumination method to carry out radiographic inspection, and for double-walled single shadow transillumination, transillumination thickness homogeneous, transverse crack detection angle are 0, and film blackness, sensitivity are all good, and the scattered ray influence is little, and the defect detection rate is high. The device is not influenced by any station in the detection of the welding seam of the industrial pipeline welding joint, can realize the central transillumination detection of more than 95 percent of the welding seam, greatly shortens the transillumination time, and obviously improves the operation efficiency.
Claims (6)
1. Visual thick wall metal pipeline welded joint gamma source center transillumination positioner, characterized by: comprises a positioning bracket unit, a gamma source containing and conveying positioning unit and a video transmission and positioning unit;
the gamma source accommodating, conveying and positioning unit is arranged in a hollow channel arranged in the positioning bracket unit, and the video transmission and positioning unit is arranged at the front end of the positioning bracket unit;
the positioning support unit comprises a front combined type support frame, a rear combined type support frame and a connection structure between supports; the front combined type supporting frame comprises a cavity type supporting middle body, three supporting arms arranged on the cavity type supporting middle body and double-roller-group mechanisms respectively arranged at the front ends of the three supporting arms; the rear combined type supporting frame also comprises a cavity type supporting middle body, three supporting arms arranged on the cavity type supporting middle body and double-roller-group mechanisms respectively arranged at the front ends of the three supporting arms;
the cavity type support middle body is of a hollow cavity type structure, and a hydraulic oil cavity is arranged in the cavity;
the three supporting arms comprise a hydraulic supporting arm and two preset supporting arms, and the three supporting arms are mutually connected to the cavity type supporting middle body at an angle of 120 degrees; the hydraulic support arm comprises a connecting piece and a hydraulic rod, the hydraulic rod is connected with the hydraulic oil cavity, and the connecting piece is used for connecting the hydraulic rod and the double-roller-group mechanism; the length is adjusted by providing pressure required by the stretching of the supporting arm through an external hydraulic pump; the double-roller mechanism is arranged on the supporting arms, the front and rear rollers are not only positioned on the same straight line, but also in the same direction as the axis direction of the pipeline, and the front and rear rollers of each supporting arm are in double-point contact with the inner wall of the pipeline to be detected;
the inter-bracket connecting structure comprises a universal joint mechanism, a universal joint connecting pipe and a connecting end head; at least one universal joint mechanism, at least one universal joint connecting pipe and at least one connecting end socket are arranged;
the connecting end is hollow, one end of the connecting end is connected with the front combined type supporting frame or the rear combined type supporting frame, and the other end of the connecting end is connected with the universal joint connecting pipe;
the universal joint connecting pipe is hollow, one end of the universal joint connecting pipe is connected to the connecting end, and the other end of the universal joint connecting pipe is provided with a universal joint connecting and fixing mechanism for connecting a universal joint mechanism;
the inner part of the universal joint mechanism is of a hollow structure, one end of the universal joint mechanism is a rotating joint, the rotating joint is rotatably fixed on the universal joint connecting and fixing mechanism, and the other end of the universal joint mechanism is connected with either the rear combined type supporting frame or the front combined type supporting frame or the other universal joint connecting pipe;
the hollow part of the connection structure between the brackets and the hollow part of the cavity type support middle body form a hollow channel arranged on the positioning bracket unit and used as a gamma source output channel;
the gamma source containing and conveying positioning unit comprises a source conveying pipe, a source positioning pipe and a steel strand, wherein the source conveying pipe is arranged in a source conveying channel at the center of a connecting structure between the cavity type support middle body and the bracket, the source positioning pipe is arranged at the top end of the source conveying channel, the gamma source is arranged at the front end of the steel strand, and the gamma source is positioned in the source positioning pipe by the steel strand through the source conveying pipe; the gamma source enters the rear combined type support frame, the inter-support connecting structure and the front combined type support frame through the source conveying pipe in sequence, and is locked after reaching the source positioning pipe;
the video transmission and positioning unit comprises a light emitting unit and a camera shooting unit; the light emitting unit comprises a fixing mechanism, a rotary adjusting mechanism and a light emitting mechanism; the fixing mechanism is used for fixing the whole light emitting unit at the front end of the combined type supporting frame; the rotary adjusting mechanism is respectively connected with the fixing mechanism and the light emitting mechanism and used for adjusting the light emitting direction of the light emitting mechanism and controlling the light to irradiate at or near the welding seam; the light emitting mechanism is used for emitting linear light and projecting the linear light onto the welding bead;
the camera shooting unit also comprises a fixing mechanism, a rotary adjusting mechanism, a camera shooting sensor and a display mechanism; the fixing mechanism is used for fixing the camera sensor at the front end of the combined type supporting frame; the rotary adjusting mechanism is respectively connected with the fixing mechanism and the camera sensor and used for adjusting the visual angle of the camera sensor; the display mechanism displays an output result of the image sensor.
2. The visual thick-wall metal pipeline welding joint gamma source central transillumination positioning device of claim 1, which is characterized in that: the connecting piece comprises a telescopic rod with adjustable length and a connecting mechanism, and the length of the telescopic rod is determined by a telescopic rod locking mechanism after being preset according to the diameter of the detected pipeline; the two preset supporting arms comprise telescopic rods and telescopic rod locking mechanisms, and the double-roller-group mechanism is arranged at the front ends of the telescopic rods.
3. The visual thick-wall metal pipeline welding joint gamma source central transillumination positioning device of claim 1, which is characterized in that: the video transmission and positioning unit is positioned above or below the gamma source working position and close to one side of the positioning support unit.
4. The visual thick-wall metal pipeline welding joint gamma source central transillumination positioning device of claim 1, which is characterized in that: the gamma source accommodating, conveying and positioning unit further comprises a steel strand positioning device, the gamma source is fixed at the front end of the steel strand, and the middle part or the rear end of the steel strand is fixed on the steel strand positioning device; the steel strand positioning device is arranged at the opening of the detected pipeline and comprises a pipe orifice fixing mechanism and a steel strand locking mechanism; the steel strand locking mechanism is positioned in the middle of the pipe orifice fixing mechanism, and the pipe orifice fixing mechanism comprises an upper pipe orifice fastening device and a lower pipe orifice fastening device and is used for being fixed at the pipe orifice of the detected pipeline.
5. The visual thick-wall metal pipeline welding joint gamma source central transillumination positioning device of claim 1, which is characterized in that: the visual thick-wall metal pipeline welding joint gamma source central transillumination positioning device can also comprise a hydraulic device; the hydraulic device is connected with a hydraulic oil cavity of the cavity type support middle body through a flexible hose to provide power for the hydraulic telescopic arm.
6. The visual thick-wall metal pipeline welding joint gamma source central transillumination positioning device of claim 1, which is characterized in that: the light ray emission mechanism is a linear infrared emitter, and the camera sensor is a wide-angle camera.
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| CN201710595087.5A CN107389706B (en) | 2017-07-20 | 2017-07-20 | Visual thick wall metal pipeline welded joint gamma source central transillumination positioning device |
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| CN201710595087.5A CN107389706B (en) | 2017-07-20 | 2017-07-20 | Visual thick wall metal pipeline welded joint gamma source central transillumination positioning device |
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| CN107389706B true CN107389706B (en) | 2020-05-19 |
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| CN107796833A (en) * | 2017-11-30 | 2018-03-13 | 祖子舒 | Pipe welding line detecting X-ray exposure device and method |
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| CN1924562A (en) * | 2006-10-13 | 2007-03-07 | 核动力运行研究所 | Main pipe welding seam ray detection and positioning device for nuclear power station steam generator |
| EP2279823A1 (en) * | 2003-10-22 | 2011-02-02 | Nippon Steel Corporation | Large-heat-input butt welded joint having controlled hardness and controlled size of the heat affected zone for excellent brittle fracture resistance |
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| EP2279823A1 (en) * | 2003-10-22 | 2011-02-02 | Nippon Steel Corporation | Large-heat-input butt welded joint having controlled hardness and controlled size of the heat affected zone for excellent brittle fracture resistance |
| CN1924562A (en) * | 2006-10-13 | 2007-03-07 | 核动力运行研究所 | Main pipe welding seam ray detection and positioning device for nuclear power station steam generator |
| CN202735267U (en) * | 2012-06-07 | 2013-02-13 | 中国石油天然气第一建设公司 | Pipeline center radiography device |
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