A flaw detector for steel pipe production

Abstract

The utility model relates to steel pipe flaw detector technical field discloses a flaw detector for steel pipe production, include: flaw detection probe, the one end outer wall connection of flaw detection probe has the cooling pipe of assembly pipe valve, the junction of cooling pipe and flaw detection probe is embedded with the shower nozzle, the middle part of cooling pipe is assembled with liquid pump, the other end of cooling pipe is connected with liquid nitrogen jar, the one end upper surface connection of flaw detection probe has the trachea, the other end of trachea is connected with the air pump. This flaw detector for steel pipe production is provided with flaw detection probe, and it is arranged at the sizing machine discharge end on the steel pipe production line through the flaw detector, can check the steel pipe production process and eliminate quality defects in time after detecting the steel pipe production defect, reduces the economic loss, and the flaw detection probe is cooled and cooled down in the cooling cavity through the liquid nitrogen of delivery when detecting the high temperature steel pipe, prevents the piezoelectric wafer of flaw detection probe from being damaged, improves the durability of the flaw detector.

Description

Technical Field

[0001] This utility model relates to the technical field of steel pipe flaw detectors, specifically a flaw detector for steel pipe production. Background Technology

[0002] In the steel pipe production process, the cooling bed can hold about 50 long steel pipes. The steel pipes go through various processes from the billet out of the annular heating furnace to the flaw detection inspection. If a defect is detected in the steel pipe during the flaw detection process, then the steel pipes in each process, including the steel pipes on the cooling bed, will be at risk of quality defects, which will cause significant economic losses.

[0003] During the use of conventional flaw detectors, when the probe is used to detect high-temperature steel pipes, the core component piezoelectric crystal inside the probe may be damaged due to the high temperature. To address this, we propose a flaw detector for steel pipe production. Utility Model Content

[0004] The purpose of this invention is to provide a flaw detector for steel pipe production to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a flaw detector for steel pipe production, comprising:

[0006] The flaw detection probe has a cooling pipe with a valve attached to one end of its outer wall. A nozzle is embedded at the connection between the cooling pipe and the flaw detection probe. A liquid pump is mounted in the middle of the cooling pipe. A liquid nitrogen tank is connected to the other end of the cooling pipe. A gas pipe is connected to the upper surface of one end of the flaw detection probe. A gas pump is connected to the other end of the gas pipe. The gas pipe is connected to a liquid nitrogen liquefier through the gas pump. The output end of the liquid nitrogen liquefier is connected to the input end of the liquid nitrogen tank. A pipe feeding mechanism is fixed on both outer walls of the flaw detection probe. A circulation pipe is connected between the flaw detection probes. A one-way valve is mounted at one end of the circulation pipe.

[0007] Furthermore, a protective film is laid on the outermost side of the detection end of the flaw detection probe, and an electrode lead is passed through the innermost side of the detection end of the flaw detection probe. A piezoelectric crystal is fixed to the inner side of the electrode lead and the protective film. One end of the electrode lead is connected to a flaw detector through a wire. A cooling cavity is opened inside the flaw detection probe, and the nozzle penetrates to one side of the inner wall of the cooling cavity.

[0008] Furthermore, the liquid nitrogen tank is connected to the flaw detection probe via a liquid pump, cooling pipe, and nozzle, and the flaw detection probe is connected to the liquid nitrogen tank via a gas pipe, gas pump, and liquid nitrogen liquefaction device.

[0009] Furthermore, the cooling pipe is connected to the cooling chamber via the nozzle, and the protective film forms a semi-enclosed structure between the piezoelectric crystal and the electrode lead, and the electrode lead is electrically connected to the flaw detector.

[0010] Furthermore, the cooling chambers are connected by a circulation pipe and a one-way valve, and the opening direction of the one-way valve is from the cooling chamber to the circulation pipe.

[0011] Furthermore, the tube feeding mechanism is provided with support rods at both ends, and the support rods are fixed to the outer walls of both sides of the flaw detection probe. A support plate is fixed to the inner surface of the support rod, and a roller groove is opened on the upper outer wall of the support plate. A sliding roller is embedded in the inner side of the roller groove through a rotating shaft.

[0012] Furthermore, the sliding roller is rotatably connected to the support plate via a roller groove, and the roller groove and the sliding roller are evenly distributed at equal intervals along the upper surface of the support plate.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This flaw detector for steel pipe production is equipped with a flaw detection probe, which is installed at the discharge end of the sizing machine on the steel pipe production line. After detecting defects in the steel pipe production, the production process can be inspected in a timely manner and the quality defects can be eliminated, reducing economic losses. At the same time, when the flaw detection probe is inspecting high-temperature steel pipes, the probe is cooled down in the cooling chamber by liquid nitrogen, which prevents damage to the piezoelectric crystal of the flaw detection probe and improves the durability of the flaw detector. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of the present invention in its combined working state;

[0016] Figure 2 This is a magnified cross-sectional view of the flaw detection probe of this utility model;

[0017] Figure 3 This is an enlarged structural diagram of the tube feeding mechanism of this utility model.

[0018] In the diagram: 1. Flaw detector probe; 101. Protective film; 102. Piezoelectric crystal; 103. Electrode lead; 104. Flaw detector; 105. Cooling chamber; 2. Cooling pipe; 3. Nozzle; 4. Liquid pump; 5. Liquid nitrogen tank; 6. Gas pipe; 7. Gas pump; 8. Liquid nitrogen liquefaction device; 9. Pipe delivery mechanism; 901. Support rod; 902. Support plate; 903. Roller trough; 904. Sliding roller; 10. Circulation pipe; 11. One-way valve. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] This utility model provides an improved flaw detector for steel pipe production. Please refer to [link / reference]. Figures 1-2 The device includes: a flaw detection probe 1; a cooling pipe 2 with an assembly valve connected to one end of the outer wall of the flaw detection probe 1; a nozzle 3 embedded at the connection between the cooling pipe 2 and the flaw detection probe 1; a liquid pump 4 mounted in the middle of the cooling pipe 2; a liquid nitrogen tank 5 connected to the other end of the cooling pipe 2; the liquid nitrogen tank 5 being connected to the flaw detection probe 1 via the liquid pump 4, the cooling pipe 2, and the nozzle 3; a gas pipe 6 connected to the upper surface of one end of the flaw detection probe 1; a gas pump 7 connected to the other end of the gas pipe 6; a liquid nitrogen liquefier 8 connected to the gas pipe 6 via the gas pump 7; and the output end of the liquid nitrogen liquefier 8 being connected to the input end of the liquid nitrogen tank 5. The flaw detection probe 1 is connected to the liquid nitrogen tank 5 via the gas pipe 6, the gas pump 7, and the liquid nitrogen liquefier 8. A pipe feeding mechanism 9 is fixed to both outer walls of the flaw detection probe 1. The internal structure includes a cooling chamber 105, with a nozzle 3 penetrating one side of the inner wall of the cooling chamber 105. The cooling pipe 2 is connected to the cooling chamber 105 via the nozzle 3. The nozzle 3 pressurizes and sprays the liquid nitrogen supplied by the cooling pipe 2 into the cooling chamber 105, promoting the flow of liquid nitrogen during cooling and cooling the flaw detection probe 1. A circulation pipe 10 is connected between the flaw detection probes 1, and a one-way valve 11 is fitted at one end of the circulation pipe 10. The cooling chambers 105 are connected via the circulation pipe 10 and the one-way valve 11, with the one-way valve 11 opening from the cooling chamber 105 towards the circulation pipe 10. The one-way valve 11 allows the liquid nitrogen cooling material injected into the cooling chamber 105 to circulate within the cooling chambers 105 of the two flaw detection probes 1, facilitating simultaneous cooling of the two working flaw detection probes 1 by liquid nitrogen.

[0021] Please see Figure 2A flaw detector for steel pipe production includes: a protective film 101 is laid on the outermost side of the detection end of the flaw detector probe 1; an electrode lead 103 is passed through the innermost side of the detection end of the flaw detector probe 1; a piezoelectric crystal 102 is fixed to the inner side of the electrode lead 103 and the protective film 101; and the protective film 101 forms a semi-enclosed structure with the electrode lead 103 through the piezoelectric crystal 102. The piezoelectric crystal 102 is the core component of the flaw detector probe 1, which utilizes the piezoelectric effect to realize the mutual conversion of electrical energy and mechanical energy in flaw detection. The device converts electrical pulse signals into ultrasonic waves and transmits them. Simultaneously, it receives reflected ultrasonic waves and converts them into electrical signals. One end of the electrode lead 103 is connected to the flaw detector 104 via a wire, and the electrode lead 103 and the flaw detector 104 are electrically connected. The wire connecting the electrode lead 103 to the piezoelectric crystal 102 and the flaw detector 104 is used to transmit electrical signals, enabling the flaw detector 104 to control the transmission and reception functions of the flaw detection probe 1, and to transmit the received signals to the flaw detector 104 for processing and display.

[0022] Please see Figure 1 and Figure 3 A flaw detector for steel pipe production includes: support rods 901 at both ends of the pipe feeding mechanism 9, and the support rods 901 are fixed to the outer walls of both sides of the flaw detector probe 1; a support plate 902 is fixed to the inner surface of the support rods 901; a roller groove 903 is formed on the upper outer wall of the support plate 902; a sliding roller 904 is embedded in the inner side of the roller groove 903 through a rotating shaft; the sliding roller 904 is rotatably connected to the support plate 902 through the roller groove 903; and the roller groove 903 and the sliding roller 904 are evenly distributed at equal intervals along the upper surface of the support plate 902.

[0023] Working Principle: For this type of flaw detector used in steel pipe production, it should be installed at the discharge end of the sizing mill during the steel pipe production process. This way, after the hot rolling processes are completed, the steel pipe can be inspected for flaws. If damage is detected, potential problems in the steel pipe rolling process can be repaired promptly, and processes that may have quality defects can be inspected and eliminated, thus minimizing economic losses. High-temperature steel pipes enter the flaw detection area after rolling. The core component of this flaw detector is a high-temperature resistant probe, which has a U-shaped cooling chamber 105 inside. The inner side of the flaw detection end is equipped with a piezoelectric crystal 102, a protective film 101, and electrode leads 103. The protective film 101 is made of high-temperature resistant ceramic material to ensure ultrasonic penetration. The electrode leads 103 adopt a double-layer insulation design to prevent high-temperature short circuits. The piezoelectric crystal 102, through the electrode leads... The circuit system of the flaw detector 104 is connected to the line 103 to realize the conversion of electrical signals and ultrasonic waves. In order to protect the piezoelectric crystal 102 from high temperature damage, liquid nitrogen in the liquid nitrogen tank 5 is delivered to the nozzle 3 through the liquid pump 4 and the cooling pipe 2. The liquid nitrogen injection volume can be adjusted by the liquid pump 4 to adapt to different steel pipe temperatures. The liquid nitrogen is injected into the cooling chamber 105 and the piezoelectric crystal 102 is cooled by the thin-walled metal shell. The heated and vaporized nitrogen gas is drawn into the liquid nitrogen liquefier 8 by the air pump 7 through the air pipe 6, reliquefies into liquid nitrogen and flows back to the liquid nitrogen tank 5 to form a circulating cooling system. In addition, the pipe feeding mechanism 9 guides the movement of the steel pipe through the support rod 901, the support plate 902 and the sliding roller 904. The circulation pipe 10 and the one-way valve 11 ensure that the liquid nitrogen in the cooling chamber 105 flows evenly. The flaw detection signal is processed by the flaw detector 104 and the defect is displayed, realizing the real-time detection of high temperature steel pipe and reducing the risk of quality defects.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A flaw detector for steel pipe production, characterized in that, include: The flaw detection probe (1) has a cooling pipe (2) with a valve attached to one end of its outer wall. A nozzle (3) is embedded at the connection between the cooling pipe (2) and the flaw detection probe (1). A liquid pump (4) is installed in the middle of the cooling pipe (2). A liquid nitrogen tank (5) is connected to the other end of the cooling pipe (2). A gas pipe (6) is connected to the upper surface of one end of the flaw detection probe (1). A gas pump (7) is connected to the other end of the gas pipe (6). A liquid nitrogen liquefaction device (8) is connected to the gas pipe (6) through the gas pump (7). The output end of the liquid nitrogen liquefaction device (8) is connected to the input end of the liquid nitrogen tank (5). A pipe feeding mechanism (9) is fixed on both sides of the outer wall of the flaw detection probe (1). A circulation pipe (10) is connected between the flaw detection probes (1). A one-way valve (11) is installed at one end of the circulation pipe (10).

2. The flaw detector for steel pipe production according to claim 1, characterized in that: The outermost side of the detection end of the flaw detection probe (1) is covered with a protective film (101), and the innermost side of the detection end of the flaw detection probe (1) is provided with an electrode lead (103). A piezoelectric crystal (102) is fixed to the inner side of the electrode lead (103) and the protective film (101). One end of the electrode lead (103) is connected to a flaw detector (104) through a wire. A cooling cavity (105) is opened inside the flaw detection probe (1), and the nozzle (3) penetrates to one side of the inner wall of the cooling cavity (105).

3. The flaw detector for steel pipe production according to claim 1, characterized in that: The liquid nitrogen tank (5) is connected to the flaw detection probe (1) via the liquid pump (4), cooling pipe (2) and nozzle (3), and the flaw detection probe (1) is connected to the liquid nitrogen tank (5) via the gas pipe (6), gas pump (7) and liquid nitrogen liquefaction device (8).

4. A flaw detector for steel pipe production according to claim 2, characterized in that: The cooling pipe (2) is connected to the cooling chamber (105) through the nozzle (3), and the protective film (101) is connected to the electrode lead (103) through the piezoelectric crystal (102) to form a semi-enclosed structure, and the electrode lead (103) is connected to the flaw detector (104) through an electrical connection.

5. A flaw detector for steel pipe production according to claim 2, characterized in that: The cooling chambers (105) are connected by a circulation pipe (10) and a one-way valve (11), and the opening direction of the one-way valve (11) is from the cooling chamber (105) to the circulation pipe (10).

6. A flaw detector for steel pipe production according to claim 1, characterized in that: The tube feeding mechanism (9) is provided with support rods (901) at both ends, and the support rods (901) are fixed on the outer walls of both sides of the flaw detection probe (1). The inner surface of the support rods (901) is fixed with a support plate (902). The upper outer wall of the support plate (902) is provided with a roller groove (903). The inner side of the roller groove (903) is fitted with a sliding roller (904) through a rotating shaft.

7. A flaw detector for steel pipe production according to claim 6, characterized in that: The sliding roller (904) is rotatably connected to the support plate (902) through the roller groove (903), and the roller groove (903) and the sliding roller (904) are evenly distributed at equal intervals along the upper surface of the support plate (902).

Images