A method and system for removing mill scale from a seamless steel tube prior to magnetic flux leakage inspection

Abstract

The present application relates to a kind of methods and systems for removing seamless steel pipe oxide skin before magnetic flux leakage testing, comprising: the seamless steel pipe to be tested is sent into the processing station of seamless steel pipe derusting machine;When it is detected that the seamless steel pipe to be tested reaches the target position, a trigger signal is sent to the PLC controller to drive the double-acting cylinder to synchronously complete the "conveying pair of rollers clamping steel pipe" and "brush roller adhering to the surface of steel pipe" instructions;The conveying pair of rollers motor is controlled to convey steel pipe at a speed of 0.5-2 m / min, and the brush roller motor is controlled to rotate and polish the surface of steel pipe at a speed of 800-1500 rpm;When the end of the seamless steel pipe to be tested passes through the post-oxidation scale removal process, the seamless steel pipe derusting machine is closed.The present application can continuously polish the outer wall of the steel pipe by controlling the brush roller motor to rotate at a high speed of 800-1500 rpm and cooperating with the low-speed uniform conveying of the steel pipe at a speed of 0.5-2 m / min, which can completely remove the oxide scale and avoid the generation of magnetic signal during testing, thereby improving the reliability of the test results.

Description

Technical Field

[0001] This invention relates to the field of seamless steel pipe cleaning technology, specifically to a method and system for removing iron oxide scale from seamless steel pipes before magnetic flux leakage testing. Background Technology

[0002] After seamless steel pipes are manufactured, iron oxide scale easily forms on their surface. If magnetic flux leakage testing is performed directly, the iron oxide scale will interfere with the magnetic field signal, leading to misjudgments and missed detections, thus affecting the quality of the steel pipe products. On the other hand, it also accelerates the wear and tear of the probe. Existing cleaning methods (such as pickling and manual grinding) have problems such as high pollution, low efficiency, and incomplete cleaning, and cannot meet the high-efficiency requirements of automated flaw detection production lines. Summary of the Invention

[0003] To address the aforementioned problems, the purpose of this invention is to provide a method and system for removing iron oxide scale from seamless steel pipes before magnetic flux leakage testing.

[0004] A method for removing iron oxide scale from seamless steel pipes before magnetic flux leakage testing includes:

[0005] Step 1: Send the seamless steel pipe to be inspected into the processing station of the seamless steel pipe rust removal machine;

[0006] Step 2: When the seamless steel pipe to be inspected is detected to have reached the target position, a trigger signal is sent to the PLC controller to drive the dual-action cylinder to simultaneously complete the instructions of "conveying rollers clamping the steel pipe" and "brush rollers adhering to the surface of the steel pipe".

[0007] Step 3: Control the conveyor roller motor to convey the steel pipe at a speed of 0.5~2m / min, and control the brush roller motor to rotate and grind the surface of the steel pipe at a speed of 800~1500rpm.

[0008] Step 4: After the end of the seamless steel pipe to be inspected has passed through, the iron oxide scale removal process is completed, and the seamless steel pipe rust removal machine is turned off.

[0009] Preferably, in step 2, a photoelectric / proximity sensor is used to detect whether the steel pipe has reached the target position.

[0010] Preferably, in step 3, a compressed air purging system of 0.6~0.8MPa is started to blow away the iron oxide scale debris that has been removed by grinding at a 45° angle.

[0011] The present invention also provides a system for removing iron oxide scale from seamless steel pipes before magnetic flux leakage testing, comprising:

[0012] The placement module is used to feed the seamless steel pipe to be inspected into the processing station of the seamless steel pipe rust removal machine;

[0013] The instruction issuing module is used to send a trigger signal to the PLC controller when the seamless steel pipe to be inspected is detected to have reached the target position, so as to drive the dual-action cylinder to simultaneously complete the instructions of "conveying rollers clamping the steel pipe" and "brush rollers adhering to the surface of the steel pipe".

[0014] The speed control module is used to control the conveyor roller motor to convey the steel pipe at a speed of 0.5~2m / min, and to control the brush roller motor to rotate and grind the surface of the steel pipe at a speed of 800~1500rpm.

[0015] The power control module is used to shut down the seamless steel pipe rust removal machine when the end of the seamless steel pipe to be inspected has passed through and the iron oxide scale removal process is completed.

[0016] The present invention also provides an electronic device, including a bus, a transceiver, a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the transceiver, the memory, and the processor are connected via the bus, characterized in that the computer program, when executed by the processor, implements the steps of the above-described method for removing iron oxide scale before magnetic flux leakage testing of seamless steel pipes.

[0017] The present invention also provides a computer-readable storage medium having a computer program stored thereon, characterized in that, when the computer program is executed by a processor, it implements the steps of the above-described method for removing iron oxide scale before magnetic flux leakage testing of seamless steel pipes.

[0018] This invention relates to a method and system for removing iron oxide scale from seamless steel pipes before magnetic flux leakage (MFL) testing. Compared with the prior art, this invention controls the brush roller motor to rotate at a high speed of 800~1500 rpm to adhere to the outer wall of the steel pipe, and combines this with a low-speed uniform pipe feeding at 0.5~2 m / min. This allows for continuous grinding of the entire outer wall of the steel pipe, completely removing the iron oxide scale, avoiding the generation of extraneous magnetic signals from the iron oxide scale during testing, and improving the reliability of the testing results.

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a method for removing iron oxide scale from seamless steel pipes before magnetic flux leakage testing, provided by the present invention. Detailed Implementation

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] Please see Figure 1 A method for removing iron oxide scale from seamless steel pipes before magnetic flux leakage testing, comprising:

[0026] Step 1: Send the seamless steel pipe to be inspected into the processing station of the seamless steel pipe rust removal machine;

[0027] Step 2: When the seamless steel pipe to be inspected is detected to have reached the target position, a trigger signal is sent to the PLC controller to drive the dual-action cylinder to simultaneously complete the instructions of "conveying rollers clamping the steel pipe" and "brush rollers adhering to the surface of the steel pipe".

[0028] Step 3: Control the conveyor roller motor to convey the steel pipe at a speed of 0.5~2m / min, control the brush roller motor to rotate and grind the surface of the steel pipe at a speed of 800~1500rpm, and start the compressed air blowing system of 0.6~0.8MPa to blow away the iron oxide scale debris that is removed by grinding at a 45° angle.

[0029] Step 4: After the end of the seamless steel pipe to be inspected has passed through, the iron oxide scale removal process is completed, and the seamless steel pipe rust removal machine is turned off.

[0030] The process of the present invention will be further described below with reference to specific embodiments:

[0031] Example 1:

[0032] 1. Feeding and positioning: The seamless steel pipe to be inspected is fed into the processing station of the seamless steel pipe rust removal machine. The photoelectric / proximity sensor detects that the steel pipe is in place and sends a trigger signal to the PLC controller.

[0033] 2. Coordination among implementing agencies:

[0034] - The PLC controller triggers the solenoid valve to drive the dual-action cylinder to simultaneously complete the "conveying rollers clamping the steel pipe" and "brush rollers adhering to the surface of the steel pipe";

[0035] - Synchronous start dual-output frequency converter: controls the conveyor roller motor to convey steel pipe at a low speed of 0.5~2m / min, and controls the brush roller motor to rotate at a high speed of 800~1500rpm;

[0036] 3. Simultaneous grinding and blowing: The brush roller rotates at high speed to grind the surface of the steel pipe, while the compressed air blowing system of 0.6~0.8MPa is started at the same time to blow away the iron oxide scale debris that is removed by grinding at a 45° angle.

[0037] 4. End detection and reset: After the end sensor detects the passage of the steel pipe end, the PLC controller triggers the following in sequence: the solenoid valve is de-energized to reset the cylinder (the rollers open and the brush rollers separate), the frequency converter stops, and the purging system is shut down;

[0038] 5. Material discharge for flaw detection: Steel pipes with iron oxide scale removed are output to the magnetic flux leakage flaw detection station.

[0039] Example 2:

[0040] Taking a seamless steel pipe with a diameter of 139mm and a diameter of 12m as an example:

[0041] - After the photoelectric sensor detects that the steel pipe is in place, the PLC triggers the solenoid valve within 0.2 seconds, and the double-acting cylinder completes the clamping of the rollers and the application of the brush rollers within 1 second.

[0042] - The frequency converter is set to the conveyor roller speed of 1m / min and the brush roller speed of 1200rpm, and starts synchronously;

[0043] - The compressed air system blows at a pressure of 0.7MPa and a 45° angle, removing debris in real time as it is conveyed through the steel pipe;

[0044] - After the end of the steel pipe passes the end sensor, the PLC triggers a reset within 0.5 seconds. After the processing is completed, the steel pipe is directly sent to the magnetic flux leakage inspection station.

[0045] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0046] 1. High degree of automation: The entire process is coordinated and controlled by PLC, which is suitable for continuous operation of the production line. The processing time for a single Φ139mm×12m steel pipe is only 10~15 seconds;

[0047] 2. Thorough removal: The combination of brush roller grinding and directional blowing achieves an iron oxide scale removal rate of ≥98%, eliminating interference from flaw detection signals;

[0048] 3. Environmentally friendly and efficient: No chemical agents are required, there is no secondary pollution, and the efficiency is more than 5 times higher than manual polishing.

[0049] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for removing iron oxide scale from seamless steel pipes before magnetic flux leakage testing, characterized in that, include: Step 1: Send the seamless steel pipe to be inspected into the processing station of the seamless steel pipe rust removal machine; Step 2: When the seamless steel pipe to be inspected is detected to have reached the target position, a trigger signal is sent to the PLC controller to drive the dual-action cylinder to simultaneously complete the instructions of "conveying rollers clamping the steel pipe" and "brush rollers adhering to the surface of the steel pipe". Step 3: Control the conveyor roller motor to convey the steel pipe at a speed of 0.5~2m / min, and control the brush roller motor to rotate and grind the surface of the steel pipe at a speed of 800~1500rpm. Step 4: After the end of the seamless steel pipe to be inspected has passed through, the iron oxide scale removal process is completed, and the seamless steel pipe rust removal machine is turned off.

2. The method for removing iron oxide scale from seamless steel pipes before magnetic flux leakage testing according to claim 1, characterized in that, In step 2, a photoelectric / proximity sensor is used to detect whether the steel pipe has reached the target position.

3. The method for removing iron oxide scale from seamless steel pipes before magnetic flux leakage testing according to claim 2, characterized in that, In step 3, the compressed air purging system with a pressure of 0.6~0.8MPa is started to blow away the iron oxide scale debris that has been removed by grinding at a 45° angle.

4. A system for removing iron oxide scale before magnetic flux leakage testing of seamless steel pipes, characterized in that, include: The placement module is used to feed the seamless steel pipe to be inspected into the processing station of the seamless steel pipe rust removal machine; The instruction issuing module is used to send a trigger signal to the PLC controller when the seamless steel pipe to be inspected is detected to have reached the target position, so as to drive the dual-action cylinder to simultaneously complete the instructions of "conveying rollers clamping the steel pipe" and "brush rollers adhering to the surface of the steel pipe". The speed control module is used to control the conveyor roller motor to convey the steel pipe at a speed of 0.5~2m / min, and to control the brush roller motor to rotate and grind the surface of the steel pipe at a speed of 800~1500rpm. The power control module is used to shut down the seamless steel pipe rust removal machine when the end of the seamless steel pipe to be inspected has passed through and the iron oxide scale removal process is completed.

5. An electronic device comprising a bus, a transceiver, a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the transceiver, the memory, and the processor are connected via the bus, characterized in that, When the computer program is executed by the processor, it implements the steps in the method for removing iron oxide scale before magnetic flux leakage testing of seamless steel pipes as described in any one of claims 1-3.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps in the method for removing iron oxide scale before magnetic flux leakage testing of seamless steel pipes as described in any one of claims 1-3.

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