Device and method for continuous nondestructive testing of long steel pipes based on CT imaging technology

Abstract

The device and method for continuous nondestructive testing of long steel pipes based on CT imaging technology of the present invention belong to the field of nondestructive testing technology, and include two groups of supporting and moving components, a detection component and a controller; the detection component includes: a tubular shell, a plurality of detection units; the spacing between two adjacent detection units along the Y direction is equal; looking from the Y direction, all detection units are evenly distributed along the circumference of the tubular shell in a circle; the two groups of supporting and moving components are respectively arranged on both sides of the detection component along the Y direction; the controller controls the moving speed of the long steel pipe to be V; the frequency of the controller controlling all detection units to be turned on and off at the same time is set to F; the spacing between the X-ray emitters of two adjacent detection units along the Y direction is set to D, then D=V*(1 / F); and also includes an adjustment tool, the electrical components of the adjustment tool are electrically connected to the controller. The device and method can continuously detect long steel pipes and save time.

Description

Technical Field

[0001] The invention belongs to the technical field of nondestructive testing, and in particular relates to a device and a method for continuously performing nondestructive testing on a long steel pipe based on CT imaging technology. Background Art

[0002] CT imaging technology is an imaging technology that uses an X-ray transmitter to emit X-rays that pass through an object, and a detector (photosensitive plate) opposite the X-ray transmitter records the X-rays that pass through the object. Combined with a computer algorithm, it generates a cross-sectional image of the object based on the electrical signal of the photosensitive area on the detector.

[0003] In order to achieve 360-degree detection of objects without blind spots, the current method is: keep the object still, make the X-ray emitter rotate 360 ​​degrees around the object, and the detector also rotates 360 degrees accordingly and always remains opposite the X-ray emitter. During the rotation of the X-ray emitter, X-rays are continuously emitted at different angles, and the detector continuously records the X-rays that pass through the object at different angles. For example: the X-ray emitter emits an X-ray after rotating 20 degrees, and the detector opposite the X-ray emitter records the X-rays that pass through the object; then the X-ray emitter continues to rotate 20 degrees and emits X-rays again, and the detector opposite the X-ray emitter records the X-rays that pass through the object again; and so on... The X-ray emitter emits a total of 18 X-rays, and the detector also records the X-rays that pass through the object 18 times, which can meet the 360-degree detection of the object.

[0004] The defect of the above detection method is that it can only be used for objects with a shorter length. For a long object, such as a long steel pipe, a 360-degree rotation of the X-ray emitter around the object is not enough to detect the entire length of the object, so the long steel pipe needs to be stepped along its axis for a certain distance and the above detection process is repeated. The number of steps increases with the length of the object.

[0005] It is not difficult to see that since the long steel pipe always steps along its axis at intervals and the movement of the long steel pipe is discontinuous, the detection process of the long steel pipe is time-consuming. For the long steel pipe, this detection device and method are not applicable. Summary of the invention

[0006] The purpose of the present invention is to provide a device and method for continuous nondestructive testing of long steel pipes based on CT imaging technology to solve the above technical problems. In order to solve the above technical problems, the present invention is implemented by the following scheme:

[0007] A device for continuously performing nondestructive testing on long steel pipes based on CT imaging technology, comprising two sets of supporting and moving components, a detection component and a controller;

[0008] The detection components include:

[0009] A tubular housing, wherein the axis of the tubular housing is arranged along the Y direction;

[0010] A plurality of detection units are installed in the tubular housing, the detection units include an X-ray emitter and a detector, and the installation positions of the X-ray emitter and the detector are in an axisymmetric relationship with respect to the Y-axis; the spacing between two adjacent detection units along the Y-direction is equal; when viewed in the Y-direction, all the detection units are evenly distributed along the circumference of the tubular housing;

[0011] Two sets of supporting moving components are respectively arranged at the left and right ends of the detection component along the Y direction, which can make the long steel pipe move along the Y direction;

[0012] The controller is used to control the moving speed V of the long steel pipe and the opening and closing of the detection units; all the detection units are opened or closed at the same time, and the opening and closing frequencies are both F; the distance between the X-ray emitters of two adjacent detection units along the Y direction is set to D, then D=V*(1 / F); the moving direction of the long steel pipe is set to be from left to right along the Y direction, and when the right end of the long steel pipe reaches the leftmost detection unit under the control of the controller, all the detection units are opened at the same time;

[0013] The supporting moving component is provided with an adjusting tool, and the electrical component of the adjusting tool is electrically connected to the controller.

[0014] Further, the support moving assembly located on the left side of the detection assembly is set as the left support moving assembly, and the left support moving assembly includes N driving units arranged at equal intervals along the Y direction; from left to right, they are sequentially recorded as: the first driving unit, ..., the Sth driving unit, ..., the Nth driving unit; S∈[1, N], N is a positive integer greater than or equal to 10;

[0015] The adjustment tool is arranged on the Kth driving unit from left to right, and the adjustment tool includes a driving motor, a limit baffle and two single-shot photoelectric sensors. The driving motor is controlled by a controller to deflect the limit baffle, and the limit baffle limits the long steel pipe; K∈[M, N], M is a positive integer greater than or equal to 3;

[0016] Two single-shot photoelectric sensors are respectively located on the left and right sides of the limit baffle; the distance from the left surface of the limit baffle to the leftmost detection unit is set to Dm, and Dm is an integer multiple of D; the drive motor, the two single-shot photoelectric sensors and the detection component are all electrically connected to the controller;

[0017] When the limit baffle is turned to the set position "0", the long steel pipe is blocked from continuing to move. When it is turned to the set position "1", the blockage of the long steel pipe is cancelled, and the long steel pipe can continue to move to the right under the action of the drive unit.

[0018] By setting the limit baffle and setting Dm to an integer multiple of D, when the right end of the long steel pipe reaches the leftmost detection unit, the leftmost detection unit is just in the open state, and the long steel pipe can be fully detected. If it is a non-integer multiple, the right end of the long steel pipe may be missed. The existence of the limit baffle allows the movement of the long steel pipe to be automatically controlled.

[0019] Furthermore, it is set that each detection unit can detect an area of ​​the long steel pipe with a length of B along the Y direction each time it is turned on, and B is greater than D.

[0020] This is to ensure that the detection areas of the same detection unit are overlapped twice after the long steel pipe moves along the Y direction, so as to avoid missing detection in a certain section of the long steel pipe.

[0021] Furthermore, there is an overlapping portion in the Y direction between the X-ray beams emitted by two adjacent X-ray emitters.

[0022] Still considering the detection area of ​​the detection unit, ensure that all detection units can completely detect the entire circumferential side wall of the long steel pipe.

[0023] Further, the axis of the tubular housing is set as line L, and the vertical plane passing through line L is set as plane Q;

[0024] Each drive unit includes:

[0025] Base;

[0026] Two support assemblies are symmetrically arranged along the surface Q;

[0027] The support components include:

[0028] A support frame, fixedly connected to the upper surface of the base;

[0029] A rotating wheel frame is fixedly connected to the supporting frame;

[0030] The driving wheel is rotatably connected to the rotating wheel frame through a bearing, the axis of the driving wheel is perpendicular to the surface Q, a V-shaped transmission groove is formed between the two driving wheels of each driving unit, and a long steel pipe is placed in the transmission groove, and the outer end of each driving wheel shaft is fixedly connected to a first sprocket, and the first sprocket coincides with the axis of the driving wheel;

[0031] Multiple adjacent first sprockets located on the same side of surface Q are grouped as a group, and an annular chain is mounted on all the first sprockets in each group and meshed with the first sprockets; each group of multiple first sprockets corresponds to a transport motor, which is disposed on a corresponding base, and a second sprocket is disposed on the output shaft of the transport motor, which meshes with the corresponding chain, and each transport motor drives a corresponding group of first sprockets to rotate, thereby driving the driving wheel to rotate and move the long steel pipe.

[0032] Furthermore, the moving speed V of the long steel tube is 1 m / s; the distance D between the X-ray emitters of two adjacent detection units along the Y direction is 0.05 m; the opening and closing frequency F of the detection unit is 20 times / s, and the length of the tubular shell along the Y direction is 1.2 m.

[0033] The moving speed is appropriate, and the opening frequency of all detection units is also appropriate. Too fast opening frequency will increase the burden on the detection units.

[0034] Furthermore, the method for continuous nondestructive testing of long steel pipes based on CT imaging technology comprises the following steps:

[0035] S1: Assemble and start the device for continuous non-destructive testing of long steel pipes based on CT imaging technology;

[0036] S2: According to the logical relationship described in Table 1, a program for controlling the deflection state of the limit baffle is burned into the controller;

[0037] Table 1 Relationship between the deflection state of the limit baffle and the left and right single-shot photoelectric sensors and the controller opening signal

[0038]

[0039] In Table 1, if the left single-shot photoelectric sensor is blocked by the long steel pipe, a "blocking" signal is generated, which is recorded as "1"; if it is not blocked by the long steel pipe, no "blocking" signal is generated, which is recorded as "0"; if the right single-shot photoelectric sensor is blocked by the long steel pipe, a "blocking" signal is generated, which is recorded as "1"; if it is not blocked by the long steel pipe, no "blocking" signal is generated, which is recorded as "0"; the controller sends an "on" signal to all detection units, and all detection units emit X-rays according to the "on" signal, which is the "on" state, recorded as "1"; the controller does not send an "on" signal to all detection units, and all detection units do not emit X-rays, which is the "off" state, recorded as "0"; the limit baffle does not block the long steel pipe from passing through, which is the "on" state, recorded as "1"; the limit baffle blocks the long steel pipe from passing through, which is the "off" state, recorded as "0";

[0040] S3: Place long steel pipe;

[0041] Place the long steel pipe on the drive unit on the left side of the limit baffle, and ensure that the right end of the long steel pipe moves to the right from the drive unit on the left side of the limit baffle;

[0042] For the long steel pipe just placed on the drive unit, its right end does not block the left single-shot photoelectric sensor and the right single-shot photoelectric sensor, and the left single-shot photoelectric sensor and the right single-shot photoelectric sensor are both "0", so according to Table 1, this is in situation type seven or situation type eight; the limit baffle blocks the long steel pipe from passing through, which is the "closed" state, recorded as "0";

[0043] S4: When the right end of the long steel pipe abuts against the left surface of the limit baffle, the state of the limit baffle is determined;

[0044] The left support moving assembly moves the long steel pipe to the right. When the right end of the long steel pipe abuts against the left surface of the limit baffle, the long steel pipe blocks the left single-shot photoelectric sensor but does not block the right single-shot photoelectric sensor. The left single-shot photoelectric sensor is recorded as "1" and the right single-shot photoelectric sensor is recorded as "0". According to Table 1, this is in situation type 1 or situation type 2.

[0045] When the right end of the long steel pipe abuts against the left surface of the limit baffle, it is necessary to determine whether the limit baffle is in the "open" state according to the state of the detection unit;

[0046] If all detection units are in the "open" state at this time, it is situation type 1, the limit baffle is "1", allowing the long steel pipe to pass;

[0047] If all detection units are in the "off" state at this time, it is situation type 2, and the limit baffle is "0", and the long steel pipe is not allowed to pass;

[0048] S5: After the right end of the long steel pipe passes through the limit baffle, the state of the limit baffle is determined;

[0049] The right end of the long steel pipe passes through the limit baffle. The long steel pipe not only blocks the left single-shot photoelectric sensor, but also blocks the right single-shot photoelectric sensor. The left single-shot photoelectric sensor and the right single-shot photoelectric sensor are both "1". According to Table 1, this is in situation type five or situation type six. The limit baffle is "1", allowing the long steel pipe to pass;

[0050] S6: After the left end of the long steel pipe passes through the left single-shot photoelectric sensor, the state of the limit baffle is determined;

[0051] When the left end of the long steel pipe passes through the left single-shot photoelectric sensor, the long steel pipe blocks the right single-shot photoelectric sensor but does not block the left single-shot photoelectric sensor. At this time, it is in situation type three or situation type four, and the limit baffle is "0";

[0052] S7: Continue to place new long steel pipes;

[0053] When situation type 3 or situation type 4 occurs, it indicates that the long steel pipe can continue to be placed. At this time, another long steel pipe is placed on the drive unit on the left side of the limit baffle;

[0054] S8: The detection unit detects the long steel pipe;

[0055] All detection units detect a certain position of the long steel pipe at a set angle, and fuse the detection images of the same position of the long steel pipe at different angles to complete the overall detection of the long steel pipe;

[0056] S9: Repeat S7 and S8, continuously place the long steel pipes to be tested, and continuously complete the non-destructive testing of other long steel pipes.

[0057] Compared with the prior art, the present invention has the following beneficial effects:

[0058] This solution uses a three-dimensional spiral line to set up multiple detection units to detect the long steel pipe. Since the angle of each detection unit is different, all the detection units can completely detect the entire side wall of the long steel pipe; combined with the spacing D of each detection unit along the X direction, the moving speed V of the long steel pipe, and the opening frequency F of the detection unit, continuous detection of a single long steel pipe is achieved, saving time. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 It is a schematic diagram of the overall structure of the device;

[0060] Figure 2 This is the state one of the long steel pipe detection process diagram of this device;

[0061] Figure 3 This is the state 2 of the long steel pipe detection process diagram of this device;

[0062] Figure 4 This is the state three of the long steel pipe detection process diagram of this device;

[0063] Figure 5 This is the state 4 of the long steel pipe detection process diagram of this device;

[0064] Figure 6 This is the state five of the long steel pipe detection process diagram of this device;

[0065] 1. Tubular shell; 2. Base; 3. Support frame; 4. Rotating wheel frame; 5. Driving wheel; 6. Limit baffle; 7. Driving motor; 8. Single-shot photoelectric sensor. DETAILED DESCRIPTION

[0066] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0067] Example 1: See Figure 1 A device for continuously performing nondestructive testing on long steel pipes based on CT imaging technology includes two sets of supporting and moving components and a detection component.

[0068] The detection components include:

[0069] The tubular housing 1 is a round tube in this embodiment, and the axis of the tubular housing 1 is along the Y direction. A plurality of support feet are fixedly installed at the bottom end of the outer circumferential side wall of the tubular housing 1, and the tubular housing 1 and the support feet can be placed on the ground as a whole by relying on the support feet.

[0070] A plurality of detection units are fixedly connected to the inner wall of the tubular housing 1. All the detection units are distributed in a three-dimensional spiral around the axis of the tubular housing 1, and the spacing between two adjacent detection units along the Y direction is equal. When viewed from the Y direction, all the detection units are evenly distributed along the circumference of the tubular housing 1. In this embodiment, there are 18 detection units in total. Figure 1 From the perspective of the viewing angle, from left to right, they are set as the first detection unit, the Zth detection unit, and the eighteenth detection unit, Z∈[1, 18], and Z is an integer. In other embodiments, other numbers of detection units may be used.

[0071] Because the detection unit is composed of an X-ray emitter and a detector, when viewed in the Y direction, the X-ray emitter and detector of each detection unit are 180 degrees apart; therefore, the aforementioned circumferentially uniform distribution means that the X-ray emitters of all detection units are uniformly distributed along the circumference of the tubular shell 1, or that the detectors of all detection units are uniformly distributed along the circumference of the tubular shell 1.

[0072] This solution only takes the X-ray emitters of all detection units as an example. Looking from the Y direction, let the center point of the tubular housing 1 be point O, let the X-ray emitters of two adjacent detection units be points P1 and P2, then ∠P1OP2=360 / 18=20 degrees. ∠P1OP2 is designed to be 20 degrees, which can ensure that the X-ray beams emitted by two adjacent X-ray emitters have overlapping parts in the Y direction. This design can completely detect a circle of the long steel pipe without missing the circumferential side wall of the long steel pipe.

[0073] All the detection units emit X-rays intermittently, and all the detection units are turned on or off at the same time. It is assumed that the turning on and off frequencies of all the detection units are F.

[0074] Looking along the radial direction of the tubular housing 1, that is, Figure 1From the perspective of perspective, the X-ray emitters of two adjacent detection units are still set to points P1 and P2, the spacing between P1 and P2 along the Y direction is set to D, the axis of the long steel pipe is parallel to the Y direction, and the moving speed of the long steel pipe along the Y direction is set to V; then D=V*(1 / F). In this embodiment, the moving speed V of the long steel pipe is set to 1m / s, and the direction is from left to right; the frequency F of opening and closing of all detection units is 20 times / s; it is calculated that the spacing D between P1 and P2 along the Y direction is 0.05m, the maximum length of all detection units along the Y direction is 0.05*18=0.9m, and the total length of the tubular shell 1 along the Y direction is 1.2m.

[0075] Because each time the detection is not only for one point of the long steel pipe, but also for a certain area of ​​the surface of the long steel pipe along the Y direction, it is assumed that each detection unit can detect the area of ​​the long steel pipe with a length of B along the Y direction after each start, and B is greater than D. The purpose of this is that the detection areas of the same detection unit are overlapped twice to avoid missing a certain section of the long steel pipe. B can be understood as: the X-rays emitted by the X-ray emitter of a single detection unit at one time can cover the area of ​​the long steel pipe with a length of B along the Y direction.

[0076] The two groups of supporting and moving components are respectively arranged on both sides of the tubular shell 1 along the Y direction, which can make the axis of the long steel pipe parallel to the Y direction and can also make the long steel pipe move at a speed V along the Y direction.

[0077] Each group of supporting moving components includes a plurality of driving units, and each driving unit is arranged at intervals along the Y direction. The driving unit includes:

[0078] The base 2 is placed on the ground; the axis of the tubular shell 1 is assumed to be line L, and the surface passing through line L and along the vertical direction is assumed to be surface Q. Two sets of supporting components are provided on the base 2. Figure 1 Only one set of support components is shown, and the two sets of support components are symmetrically arranged along surface Q.

[0079] The support components include:

[0080] A support frame 3 is fixedly connected to the upper surface of the base 2;

[0081] The rotating wheel frame 4 is fixedly connected to the supporting frame 3;

[0082] The driving wheel 5 is rotatably connected to the rotating wheel frame 4 by means of a bearing, and the axis of the driving wheel 5 is perpendicular to the plane Q. A V-shaped transmission groove is formed between the driving wheels 5 of the two sets of supporting components, and the long steel pipe is placed in the transmission groove. The two driving wheels 5 jointly support the long steel pipe. The two sets of supporting components jointly drive the long steel pipe to move.

[0083] The specific driving method is as follows: from a group of supporting components, the outer end of the rotating shaft of each driving wheel 5 is fixedly connected to a first sprocket, and the axis of the first sprocket coincides with the axis of the corresponding driving wheel 5. From a plurality of driving units, the plurality of first sprockets on one side of the surface Q are regarded as a group, and an annular chain is set on all the first sprockets of each group and meshes with them;

[0084] Each group of multiple first sprockets corresponds to a transport motor, which is arranged on a corresponding base 2. A second sprocket is arranged on the output shaft of the transport motor, and the second sprocket is engaged with the corresponding chain. Each transport motor drives a corresponding group of first sprockets to rotate, thereby driving the driving wheel 5 to rotate and move the long steel pipe.

[0085] The moving direction of the long steel pipe is Figure 1 From left to right in the figure, the two groups of supporting moving components are recorded as left supporting moving components and right supporting moving components according to the moving direction.

[0086] In this embodiment, since the length of the long steel tube is relatively long and the tubular shell 1 is relatively short along the Y direction, although the tubular shell 1 does not have a support member for supporting the long steel tube, relying on the support of the long steel tube by other driving units, the long steel tube is not bent due to the lack of support from the support member, and the situation where the right end of the long steel tube cannot reach the right supporting moving assembly will not occur.

[0087] Assume that there are N driving units in the left support moving assembly, which are sequentially recorded as the first driving unit, ..., the Sth driving unit, ..., the Nth driving unit along the moving direction, S∈[1,N], and N is an integer greater than or equal to 10.

[0088] A driving motor 7 is provided on the base 2 of the Kth driving unit from left to right, K∈[M, N], and M is an integer greater than or equal to 3. The mounting base of the driving motor 7 is fixedly mounted on the corresponding base 2, the axis of the rotating shaft of the driving motor 7 is parallel to the Y direction, and a limit baffle 6 is fixedly mounted on the rotating shaft of the driving motor 7. In this embodiment, the limit baffle 6 is in the shape of a disc, the center line of the limit baffle 6 is along the Y direction, and the driving motor 7 is connected to the eccentric position of the limit baffle 6.

[0089] The driving motor 7 is used to drive the limit baffle 6 to rotate. Under the action of the driving motor 7, the limit baffle 6 can reciprocate clockwise or counterclockwise around the axis of the driving motor 7. Specifically, from the Y direction, it is assumed that the limit baffle 6 is in the initial state when it is not rotating. In the initial state, the limit baffle 6 is in the "open" state; if the limit baffle 6 rotates 90 degrees counterclockwise under the drive of the driving motor 7, the limit baffle 6 is in the "closed" state; when the limit baffle 6 rotates 90 degrees clockwise again, it resets to the initial state, and the limit baffle 6 is in the "open" state again. The driving motor 7 realizes the "open" or "closed" state conversion of the limit baffle 6 by continuously rotating 90 degrees clockwise or counterclockwise. The rotation angle of the driving motor 7 is realized by the program control of the driving motor 7. The driving motor 7 is a servo motor. When the set angle is reached, the driving motor 7 can stop and self-lock. The action of the driving motor 7 is completed in a short time, and the action time is 10ms. The "closed" state can be understood as: the limit baffle 6 can block the long steel pipe, so that Figure 1 The right end of the middle and long steel pipe 2 cannot move to the drive unit on the right side of the limit baffle 6. The "open" state can be understood as: the limit baffle 6 no longer blocks the long steel pipe, allowing Figure 1 The right end of the middle and long steel pipe 2 can be moved to the driving unit on the right side of the limit baffle 6.

[0090] The distance from the left side surface of the limit baffle 6 to the first detection unit is designed to be an integer multiple of D. The purpose of this design is: Figure 1 When the right end of the middle and long steel pipe 2 reaches the first detection unit of the tubular housing 1, the detection unit can just open and detect the right end of the long steel pipe 2. If it is not designed in this way, when the right end of the long steel pipe 2 reaches the first detection unit, the first detection unit may be in a closed state, resulting in the situation that the right end of the long steel pipe 2 is missed.

[0091] Two single-shot photoelectric sensors 8 are also fixedly mounted on the corresponding drive unit base 2. Figure 1 The left and right directions are respectively marked as a left single-shot photoelectric sensor and a right single-shot photoelectric sensor. The left single-shot photoelectric sensor is close to the left surface of the limit baffle 6, and the right single-shot photoelectric sensor is close to the right surface of the limit baffle 6. The two single-shot photoelectric sensors 8 are respectively used to monitor whether the left and right sides of the limit baffle 6 are blocked by the long steel pipe.

[0092] The controller is also included, which is used to be electrically connected with the two single-shot photoelectric sensors 8, the drive motor 7 and all the detection units. The controller can receive the signal of the single-shot photoelectric sensor 8. It can also activate the drive motor 7 to make the limit baffle 6 in the "open" state or the "closed" state; it can also control all the detection units to be opened and closed at the same time.

[0093] Embodiment 2: A method for continuously performing nondestructive testing on a long steel pipe based on CT imaging technology comprises the following steps:

[0094] S1: Assemble and start the device for continuous non-destructive testing of long steel pipes based on CT imaging technology;

[0095] S2: According to the logical relationship described in Table 1, a program for controlling the deflection state of the limit baffle is burned into the controller;

[0096] Table 1 Relationship between the deflection state of the limit baffle 6 and the left and right single-shot photoelectric sensors and the controller opening signal

[0097]

[0098] In Table 1, if the left single-shot photoelectric sensor is blocked by a long steel pipe, an "blocking" signal is generated, which is recorded as "1"; if it is not blocked by the long steel pipe, no "blocking" signal is generated, which is recorded as "0". If the right single-shot photoelectric sensor is blocked by a long steel pipe, an "blocking" signal is generated, which is recorded as "1"; if it is not blocked by the long steel pipe, no "blocking" signal is generated, which is recorded as "0". The controller sends an "on" signal to all detection units, and all detection units emit X-rays according to the "on" signal. At this time, it is in the "on" state, which is recorded as "1"; the controller does not send an "on" signal to all detection units, and all detection units do not emit X-rays, which is in the "off" state, which is recorded as "0". The limit baffle 6 does not block the passage of the long steel pipe, which is in the "on" state, which is recorded as "1"; the limit baffle 6 blocks the passage of the long steel pipe, which is in the "off" state, which is recorded as "0".

[0099] S3: Place the long steel pipe.

[0100] Place the long steel pipe on the drive unit on the left side of the limit baffle 6, and ensure that the right end of the long steel pipe moves to the right from the drive unit on the left side of the limit baffle 6;

[0101] For the long steel pipe 1 just placed on the drive unit, its right end does not block the left single-shot photoelectric sensor and the right single-shot photoelectric sensor, so the left single-shot photoelectric sensor and the right single-shot photoelectric sensor are both "0". Figure 2 state, so according to Table 1, Figure 2 The state is in situation type seven or situation type eight; at this time, the limit baffle 6 blocks the long steel pipe from passing through, which is the "closed" state, recorded as "0".

[0102] S4: When the right end of the long steel pipe abuts against the left surface of the limit baffle 6, the state of the limit baffle 6 is determined.

[0103] The left support moving assembly moves the long steel pipe 1 to the right. When the right end of the long steel pipe 1 abuts against the left surface of the limit baffle 6, that is, Figure 3At this time, the long steel pipe blocks the left single-shot photoelectric sensor, but does not block the right single-shot photoelectric sensor. The left single-shot photoelectric sensor is recorded as "1" and the right single-shot photoelectric sensor is recorded as "0". According to Table 1, at this time, Figure 3 Being in situation category 1 or situation category 2;

[0104] When the right end of the long steel pipe 1 abuts against the left surface of the limit baffle 6, it is necessary to determine whether the limit baffle 6 is in the "open" state according to the state of the detection unit. That is, if all the detection units are in the "open" state at this time, it is situation type 1, the limit baffle 6 is "1", and the long steel pipe 1 is allowed to pass;

[0105] On the contrary, if all the detection units are in the "closed" state at this time, it is situation type two, and the limit baffle 6 is "0", and the long steel pipe is not allowed to pass through; however, because the detection units are constantly changing at the frequency F, all the detection units will become "open" at the next moment. At the next moment, all the detection units will become "open" and become situation type one. The limit baffle 6 is "1", allowing the long steel pipe to pass through.

[0106] S5: After the right end of the long steel pipe passes through the limit baffle 6, the state of the limit baffle 6 is determined.

[0107] After the limit baffle 6 is "1", the left support moving assembly moves the long steel pipe 1 to the right, and the right end of the long steel pipe 1 passes through the limit baffle 6, that is, Figure 4 At this time, the long steel pipe not only blocks the left single-shot photoelectric sensor, but also blocks the right single-shot photoelectric sensor. The left single-shot photoelectric sensor and the right single-shot photoelectric sensor are both "1". According to Table 1, at this time Figure 4 It is in situation type five or situation type six; at this time, the limit baffle 6 is "1", allowing the long steel pipe to pass through.

[0108] S6: After the left end of the long steel pipe passes through the left single-shot photoelectric sensor, the state of the limit baffle 6 is determined.

[0109] The left support moving assembly makes the long steel pipe continue to move to the right. When the left end of the long steel pipe passes through the left single-shot photoelectric sensor, Figure 5 State, the long steel pipe blocks the right single-shot photoelectric sensor, but does not block the left single-shot photoelectric sensor. At this time, according to Table 1, Figure 5 In case of situation type 3 or situation type 4, at this time, the limit baffle 6 is "0", and the next long steel pipe is not allowed to pass.

[0110] S7: Continue placing new long steel pipes.

[0111] When situation type 3 or situation type 4 occurs, it indicates that the long steel pipe can continue to be placed, and another long steel pipe is placed on the drive unit on the left side of the limit baffle 6; Figure 6 The other long steel pipe is recorded as long steel pipe 2, and the process of long steel pipe 2 passing through the limit baffle 6 is exactly the same as that of long steel pipe 1.

[0112] S8: The detection unit detects the long steel pipe.

[0113] Because the testing process of other long steel pipes is the same as that of long steel pipe 1, long steel pipe 1 is used as an example.

[0114] from Figure 3 After the limit baffle 6 no longer blocks the long steel pipe 1, the left support moving assembly moves the long steel pipe 1 to the right. Because the left support moving assembly makes the limit baffle 6 move at a speed of V, and the frequency of all detection units is F; when the right end of the long steel pipe 1 abuts against the left surface of the limit baffle 6, and the limit baffle 6 no longer blocks the right end of the long steel pipe 1, all detection units are just in the open state; according to the formula D=V*(1 / F), when the right end of the long steel pipe 1 moves a distance D to the right, all detection units are in the open state, because Figure 3 At this time, the distance between the right end of the long steel pipe 1 and the first detection unit is an integer multiple of D, so when the right end of the long steel pipe 1 moves to the first detection unit, the first detection unit is just in the open state.

[0115] When the right end of the long steel tube 1 reaches the first detection unit, the first detection unit is turned on and detects the right end of the long steel tube 1, but the first detection unit only detects the right end of the long steel tube 1 at its set angle; at the next moment, the right end of the long steel tube 1 reaches the second detection unit, the second detection unit is just turned on, and the second detection unit detects the right end of the long steel tube 1 at its set angle; when the right end of the long steel tube 1 reaches the Zth detection unit, Z∈[1,18], the Zth detection unit is just turned on, and the Zth detection unit detects the right end of the long steel tube 1 at its set angle; by fusing the detection images of the right end of the long steel tube 1 by all detection units, a complete circle detection image of the right end of the long steel tube 1 can be obtained.

[0116] Similarly, when other positions other than the right end of the long steel pipe reach the Zth detection unit, the Zth detection unit is just turned on, and the Zth detection unit detects other positions of the long steel pipe at its set angle. By fusing the detection images of other positions of the long steel pipe by all detection units, a detection image of a circle of other positions of the long steel pipe can be obtained. At this point, the overall detection of the long steel pipe is completed. Image fusion is an existing technology and will not be repeated.

[0117] S9: Repeat S7 and S8, continuously place other long steel pipes, and continuously test other long steel pipes.

[0118] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A device for continuous nondestructive testing of long steel pipes based on CT imaging technology, characterized in that: It includes two sets of supporting and moving components, a detection component and a controller; The detection components include: A tubular housing, wherein the axis of the tubular housing is arranged along the Y direction; A plurality of detection units are installed in the tubular housing, the detection units include an X-ray emitter and a detector, and the installation positions of the X-ray emitter and the detector are in an axisymmetric relationship with respect to the Y-axis; the spacing between two adjacent detection units along the Y-direction is equal; when viewed in the Y-direction, all the detection units are evenly distributed along the circumference of the tubular housing; Two sets of supporting moving components are respectively arranged at the left and right ends of the detection component along the Y direction, which can make the long steel pipe move along the Y direction; The controller is used to control the moving speed V of the long steel pipe and the opening and closing of the detection units; all the detection units are opened or closed at the same time, and the opening and closing frequencies are both F; the distance between the X-ray emitters of two adjacent detection units along the Y direction is set to D, then D=V*(1 / F); the moving direction of the long steel pipe is set to be from left to right along the Y direction, and when the right end of the long steel pipe reaches the leftmost detection unit under the control of the controller, all the detection units are opened at the same time; The support moving component is provided with an adjustment tool, and the electrical component of the adjustment tool is electrically connected to the controller; the support moving component located on the left side of the detection component is set as the left support moving component, and the left support moving component includes N driving units arranged at equal intervals along the Y direction; from left to right, they are sequentially recorded as: the first driving unit, ..., the Sth driving unit, ..., the Nth driving unit; S∈[1, N], N is a positive integer greater than or equal to 10; The adjustment tool is arranged on the Kth driving unit from left to right, and the adjustment tool includes a driving motor, a limit baffle and two single-shot photoelectric sensors. The driving motor is controlled by a controller to deflect the limit baffle, and the limit baffle limits the long steel pipe; K∈[M, N], M is a positive integer greater than or equal to 3; Two single-shot photoelectric sensors are respectively located on the left and right sides of the limit baffle; the distance from the left surface of the limit baffle to the leftmost detection unit is set to Dm, and Dm is an integer multiple of D; the drive motor, the two single-shot photoelectric sensors and the detection component are all electrically connected to the controller; When the limit baffle is turned to the set position "0", the long steel pipe is blocked from continuing to move. When it is turned to the set position "1", the blockage of the long steel pipe is released, and the long steel pipe can continue to move to the right under the action of the drive unit.

2. The device for continuous nondestructive testing of long steel pipes based on CT imaging technology according to claim 1 is characterized in that: It is set that each detection unit can detect an area of ​​the long steel pipe with a length of B along the Y direction each time it is turned on, and B is greater than D.

3. The device for continuous nondestructive testing of long steel pipes based on CT imaging technology according to claim 2 is characterized in that: The X-ray beams emitted by two adjacent X-ray emitters have overlapping parts in the Y direction.

4. The device for continuous nondestructive testing of long steel pipes based on CT imaging technology according to claim 3 is characterized in that: The axis of the tubular shell is set as line L, and the vertical plane passing through line L is set as surface Q; Each drive unit includes: Base; Two support assemblies are symmetrically arranged along the surface Q; The support components include: A support frame, fixedly connected to the upper surface of the base; A rotating wheel frame is fixedly connected to the supporting frame; The driving wheel is rotatably connected to the rotating wheel frame through a bearing, the axis of the driving wheel is perpendicular to the surface Q, a V-shaped transmission groove is formed between the two driving wheels of each driving unit, and a long steel pipe is placed in the transmission groove, and the outer end of each driving wheel shaft is fixedly connected to a first sprocket, and the first sprocket coincides with the axis of the driving wheel; Multiple adjacent first sprockets located on the same side of surface Q are grouped as a group, and an annular chain is mounted on all the first sprockets in each group and meshed with the first sprockets; each group of multiple first sprockets corresponds to a transport motor, which is disposed on a corresponding base, and a second sprocket is disposed on the output shaft of the transport motor, which meshes with the corresponding chain, and each transport motor drives a corresponding group of first sprockets to rotate, thereby driving the driving wheel to rotate and move the long steel pipe.

5. The device for continuous nondestructive testing of long steel pipes based on CT imaging technology according to claim 4 is characterized in that: The moving speed V of the long steel tube is 1 m / s; the distance D between the X-ray emitters of two adjacent detection units along the Y direction is 0.05 m; the opening and closing frequency F of the detection unit is 20 times / s, and the length of the tubular shell along the Y direction is 1.2 m.

6. A method for continuously performing nondestructive testing on long steel pipes based on CT imaging technology, based on the device for continuously performing nondestructive testing on long steel pipes based on CT imaging technology according to claim 4, characterized in that: The following steps are involved: S1: Assemble and start the device for continuous non-destructive testing of long steel pipes based on CT imaging technology; S2: According to the logical relationship described in Table 1, a program for controlling the deflection state of the limit baffle is burned into the controller; Table 1 Relationship between the deflection state of the limit baffle and the left and right single-shot photoelectric sensors and the controller opening signal ； In Table 1, if the left single-shot photoelectric sensor is blocked by the long steel pipe, a "blocking" signal is generated, which is recorded as "1"; if it is not blocked by the long steel pipe, no "blocking" signal is generated, which is recorded as "0"; if the right single-shot photoelectric sensor is blocked by the long steel pipe, a "blocking" signal is generated, which is recorded as "1"; if it is not blocked by the long steel pipe, no "blocking" signal is generated, which is recorded as "0"; the controller sends an "on" signal to all detection units, and all detection units emit X-rays according to the "on" signal, which is the "on" state, which is recorded as "1"; the controller does not send an "on" signal to all detection units, and all detection units do not emit X-rays, which is the "off" state, which is recorded as "0"; the limit baffle does not block the long steel pipe from passing through, which is the "on" state, which is recorded as "1"; the limit baffle blocks the long steel pipe from passing through, which is the "off" state, which is recorded as "0"; S3: Place long steel pipe; Place the long steel pipe on the drive unit on the left side of the limit baffle, and ensure that the right end of the long steel pipe moves to the right from the drive unit on the left side of the limit baffle; For the long steel pipe just placed on the drive unit, its right end does not block the left single-shot photoelectric sensor and the right single-shot photoelectric sensor, and the left single-shot photoelectric sensor and the right single-shot photoelectric sensor are both "0". Therefore, according to Table 1, this is in situation type seven or situation type eight; the limit baffle blocks the long steel pipe from passing through, which is the "closed" state, recorded as "0"; S4: When the right end of the long steel pipe abuts against the left surface of the limit baffle, the state of the limit baffle is determined; The left support moving assembly moves the long steel pipe to the right. When the right end of the long steel pipe abuts against the left surface of the limit baffle, the long steel pipe blocks the left single-shot photoelectric sensor but does not block the right single-shot photoelectric sensor. The left single-shot photoelectric sensor is recorded as "1" and the right single-shot photoelectric sensor is recorded as "0". According to Table 1, this is in situation type 1 or situation type 2. When the right end of the long steel pipe abuts against the left surface of the limit baffle, it is necessary to determine whether the limit baffle is in the "open" state according to the state of the detection unit; If all detection units are in the "open" state at this time, it is situation type 1, the limit baffle is "1", allowing the long steel pipe to pass; If all detection units are in the "off" state at this time, it is situation type 2, and the limit baffle is "0", and the long steel pipe is not allowed to pass; S5: After the right end of the long steel pipe passes through the limit baffle, the state of the limit baffle is determined; The right end of the long steel pipe passes through the limit baffle. The long steel pipe not only blocks the left single-shot photoelectric sensor, but also blocks the right single-shot photoelectric sensor. The left single-shot photoelectric sensor and the right single-shot photoelectric sensor are both "1". According to Table 1, this is in situation type five or situation type six. The limit baffle is "1", allowing the long steel pipe to pass; S6: After the left end of the long steel pipe passes through the left single-shot photoelectric sensor, the state of the limit baffle is determined; After the left end of the long steel pipe passes through the left single-shot photoelectric sensor, the long steel pipe blocks the right single-shot photoelectric sensor but does not block the left single-shot photoelectric sensor. At this time, it is in situation type three or situation type four, and the limit baffle is "0"; S7: Continue to place new long steel pipes; When situation type 3 or situation type 4 occurs, it indicates that the long steel pipe can continue to be placed. At this time, another long steel pipe is placed on the drive unit on the left side of the limit baffle; S8: The detection unit detects the long steel pipe; All detection units detect a certain position of the long steel pipe at a set angle, and fuse the detection images of the same position of the long steel pipe at different angles to complete the overall detection of the long steel pipe; S9: Repeat S7 and S8, continuously place the long steel pipes to be tested, and continuously complete the non-destructive testing of other long steel pipes.

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