Internal detection device for heat exchange tube of pressure vessel

Abstract

An internal detection device for a heat exchange tube of a pressure vessel relates to the technical field of ultrasonic nondestructive testing of pipelines, is simple and convenient to operate, high in operability and high in detection efficiency, and can facilitate on-site detection of damage of the heat exchange tube. In the internal detection device of the pressure vessel heat exchange tube, a measurement control circuit is connected with a transmitting circuit, the transmitting circuit is used for driving a detection coil in a transmitting probe in a detection probe to transmit an ultrasonic guided wave signal, and a receiving amplification circuit is used for amplifying a millivolt-level voltage signal received by a receiving probe in the detection probe to a volt level. The receiving and amplifying circuit is sequentially connected with a signal acquisition circuit and a result display circuit; the transmitting probe is sequentially connected with a first connecting rod, a second connecting rod, a receiving probe and a third connecting rod; the transmitting probe, the receiving probe, the second connecting rod and the third connecting rod are respectively provided with a female connector, the first connecting rod, the second connecting rod and the third connecting rod are respectively provided with a male connector, the connectors of the same parts are connected through wires, and the connectors of different parts are correspondingly connected in an inserted mode.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipeline ultrasonic nondestructive testing technical field especially relates to a pressure vessel heat exchange pipe's internal detection device. BACKGROUND

[0002] In the shell and tube pressure vessel, such as shell and tube heat exchanger, shell and tube condenser, heat exchange pipe is widely used as the medium between different media exchanges heat energy, the huge number of heat exchange pipes are densely arranged in the pressure vessel, dozens of heat exchange pipes at least, and ten thousand heat exchange pipes at most, due to the close distance between adjacent heat exchange pipes, the defect detection cannot be carried out outside the heat exchange pipe. During the long-term use, due to corrosion, scouring, abrasion, scaling and other reasons, the heat exchange pipe will appear cracking, perforation and other damages, causing the medium leakage in the pipe, and causing serious safety accidents.

[0003] At present, the nondestructive testing method for heat exchange pipe mainly is pipeline internal detection, and the endoscope visual detection and eddy current detection are the most commonly used detection methods. The limitations of the two methods are as follows: 1, the detection of heat exchange pipe defects must be carried out point by point, the detection efficiency is low, and the detection points are difficult to completely cover the whole heat exchange pipe; 2, due to the influence of skin effect, the eddy current detection can only detect the internal surface defects of the pipeline, and the penetration of thick-walled pipe is insufficient.

[0004] Therefore, how to provide a kind of pressure vessel heat exchange pipe's internal detection device, it is simple and easy to operate, operability is strong, detection efficiency is high, can facilitate the field detection of heat exchange pipe damage, it has become the technical problem that the technical personnel in the field urgently need to solve. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of pressure vessel heat exchange pipe's internal detection device, it is simple and easy to operate, operability is strong, detection efficiency is high, can facilitate the field detection of heat exchange pipe damage.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0007] A kind of pressure vessel heat exchange pipe's internal detection device, including: detection host and detection probe, the detection host is placed in the outside of the pipe to be detected, and the detection probe is placed in the inside of the pipe to be detected;

[0008] The detection host includes: measurement control circuit and receiving amplification circuit, the measurement control circuit is connected with transmitting circuit, and the transmitting circuit is used to drive the detection coil inside the transmitting probe in the detection probe to transmit ultrasonic guided wave signal, the receiving amplification circuit is used to amplify the millivolt level voltage signal received by the receiving probe in the detection probe to volt level, the receiving amplification circuit is connected with signal acquisition circuit, and the signal acquisition circuit is connected with result display circuit;

[0009] The detection probe comprises the transmitting probe, the transmitting probe is connected with a first connecting rod, the first connecting rod is connected with a second connecting rod, the second connecting rod is connected with the receiving probe, and the receiving probe is connected with a third connecting rod; wherein the transmitting probe, the receiving probe, the second connecting rod and the third connecting rod are respectively provided with female connectors, the first connecting rod, the second connecting rod and the third connecting rod are respectively provided with male connectors, and the male connectors and / or the female connectors between the same components are connected through wires, and the male connectors and the female connectors between different components are correspondingly inserted.

[0010] The measurement control circuit is built based on an ARM chip and an FPGA chip system, and is used for controlling the synchronization and coordination of the whole detection device; the ARM chip controls the FPGA chip to output a square wave pulse to the transmitting circuit for signal transmission;

[0011] The transmitting circuit is used for realizing power amplification of a transmitting signal; the square wave pulse output by the measurement control circuit is amplified to a high-voltage pulse of more than ±300V through the amplification of a switch driving circuit and a high-voltage circuit in the transmitting circuit, and drives the detection coil in the transmitting probe to transmit an ultrasonic guided wave signal.

[0012] Specifically, the receiving amplification circuit is composed of an amplification chip and a filter chip, and is used for amplifying the millivolt-level voltage signal received by the receiving probe to a volt-level;

[0013] The signal acquisition circuit is composed of a data acquisition chip and an FPGA chip system, and is used for collecting and storing the voltage signal output by the receiving amplification circuit;

[0014] The result display circuit is composed of a liquid crystal display screen, and the display content is controlled by the ARM chip system of the measurement control circuit, and the ultrasonic guided wave signal collected by the signal acquisition circuit is displayed in the form of a detection waveform; wherein the abscissa is the waveform propagation time, and the ordinate is the signal amplitude.

[0015] Further, the transmitting probe comprises a transmitting probe shell and a transmitting probe upper cover matched and docked with the transmitting probe shell; the inside of the transmitting probe shell is sequentially provided from bottom to top with a transmitting probe permanent magnet, a transmitting probe center column and a transmitting probe permanent magnet; the transmitting probe upper cover is connected with the female connector, and the inside of the female connector is provided with two electrodes, and the two electrodes are respectively connected with two ends of a coil of enameled wire wound around the transmitting probe center column.

[0016] Further, the electrodes inside the female joint are connected with the enamel-coated coil outside the center column of the transmitting probe by welding, and the female joint is connected with the upper cover of the transmitting probe by adhesion; the upper center blind hole of the upper cover of the transmitting probe has internal threads, the lower boss has external threads, and the upper cover of the transmitting probe is connected with the shell of the transmitting probe by threads;

[0017] The permanent magnets of the transmitting probe are adsorbed on both ends of the center column of the transmitting probe by magnetic force, the enamel-coated coil wound outside the center column of the transmitting probe serves as the detection coil, and both ends of the detection coil pass through the gap between the permanent magnets of the transmitting probe and the shell of the transmitting probe and are welded with the electrodes inside the female joint.

[0018] Further, the receiving probe comprises a receiving probe shell, a receiving probe upper cover and a receiving probe lower cover which are matched and docked with the receiving probe shell; the inside of the receiving probe shell is sequentially provided with a receiving probe permanent magnet, a receiving probe center column and a receiving probe permanent magnet from bottom to top; the receiving probe upper cover is connected with one female joint, the receiving probe lower cover is connected with two female joints, and the two electrodes inside one female joint of the receiving probe lower cover are respectively connected with both ends of the enamel-coated coil wound outside the receiving probe center column.

[0019] Further, the female joint is connected with the receiving probe upper cover and the receiving probe lower cover by adhesion respectively; the upper center blind hole of the receiving probe upper cover and the receiving probe lower cover has internal threads respectively, the lower boss has external threads respectively, and the receiving probe upper cover and the receiving probe lower cover are connected with the receiving probe shell by threads respectively;

[0020] The receiving probe permanent magnet and the receiving probe center column have through holes at their centers respectively, the receiving probe permanent magnet is adsorbed on both ends of the receiving probe center column by magnetic force, the enamel-coated coil wound outside the receiving probe center column serves as the detection coil, both ends of the detection coil pass through the gap between the receiving probe permanent magnet and the receiving probe shell and are welded with the electrodes inside one female joint installed on the receiving probe lower cover; at the same time, the female joint installed on the receiving probe upper cover is connected with the electrodes of another female joint installed on the receiving probe lower cover by a wire, and the wire passes through the through holes of the receiving probe permanent magnet and the receiving probe center column.

[0021] Further, the first connecting rod comprises a first connecting rod body, and both ends of the first connecting rod body are provided with cylindrical bosses provided with external threads; the first connecting rod body is provided with a through hole for penetrating the wires between the two male joints.

[0022] Further, the second connecting rod comprises a second connecting rod body, one end of the second connecting rod body is provided with a cylindrical boss provided with external threads, and the other end is provided with a groove provided with internal threads; the second connecting rod body is provided with a through hole, one end of the through hole is inserted and fixed with the male joint, and the other end of the through hole is bonded and fixed with the female joint, and the through hole is used for penetrating the wires between the male joint and the female joint.

[0023] Further, the third connecting rod comprises a third connecting rod body, one end of the third connecting rod body is provided with a cylindrical boss provided with external threads, and the other end is provided with a groove provided with internal threads; the third connecting rod body is provided with two through holes, one end of the two through holes is inserted and fixed with the male joint, and the other end of the two through holes is bonded and fixed with the female joint, and the two through holes are respectively used for penetrating the wires between the corresponding male joint and the female joint.

[0024] Further, the material of the transmitting probe shell and the receiving probe shell is polytetrafluoroethylene, the material of the transmitting probe upper cover, the receiving probe upper cover and the receiving probe lower cover is aluminum alloy, the material of the transmitting probe permanent magnet and the receiving probe permanent magnet is neodymium iron boron, the material of the transmitting probe center column and the receiving probe center column is carbon steel, the material of the female joint and the male joint is stainless steel, and the material of the first connecting rod, the second connecting rod and the third connecting rod is polytetrafluoroethylene.

[0025] Compared with the prior art, the internal detection device of the heat exchange pipe of the pressure vessel has the following advantages:

[0026] The internal detection device of the pressure container heat exchange pipe provided by the utility model can determine the specific position of the detection probe inside the detected pipeline under the action of the first connecting rod, the second connecting rod and the third connecting rod, that is, the ultrasonic guided wave can propagate along the pipeline axial direction on the pipe wall between the transmitting probe and the receiving probe, so that the whole pipeline range between the transmitting probe and the receiving probe can be detected at one time; in other words, the internal detection device of the pressure container heat exchange pipe provided by the utility model excites the ultrasonic guided wave inside the heat exchange pipe by using the electromagnetic ultrasonic mode, the position of the transmitting probe and the receiving probe can be flexibly set inside the heat exchange pipe according to the detection requirement, and the excited ultrasonic guided wave propagates along the axial direction in the heat exchange pipe wall, so that all the pipe wall between the transmitting probe and the receiving probe can be covered in one-time detection, thereby having very high detection efficiency; in addition, the transmitting probe and the receiving probe can realize the transmission of the sound wave without the help of the ultrasonic coupling agent between the transmitting probe, the receiving probe and the detected pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 The whole structure frame schematic view of the internal detection device of the pressure container heat exchange pipe provided by the utility model embodiment is shown in the figure.

[0028] Figure 2 The structure schematic view of the detection probe in the internal detection device of the pressure container heat exchange pipe provided by the utility model embodiment is shown in the figure.

[0029] Figure 3 The structure schematic view of the transmitting probe in the internal detection device of the pressure container heat exchange pipe provided by the utility model embodiment is shown in the figure.

[0030] Figure 4 The structure schematic view of the receiving probe in the internal detection device of the pressure container heat exchange pipe provided by the utility model embodiment is shown in the figure.

[0031] Figure 5 The structure schematic view of the first connecting rod in the internal detection device of the pressure container heat exchange pipe provided by the utility model embodiment is shown in the figure.

[0032] Figure 6 The structure schematic view of the second connecting rod in the internal detection device of the pressure container heat exchange pipe provided by the utility model embodiment is shown in the figure.

[0033] Figure 7 The structure schematic view of the third connecting rod in the internal detection device of the pressure container heat exchange pipe provided by the utility model embodiment is shown in the figure.

[0034] Reference signs:

[0035] A-detection host computer; B-detection probe;

[0036] 11-measurement control circuit; 12-receiving amplifier circuit; 13-transmitting circuit; 14-signal acquisition circuit; 15-result display circuit;

[0037] 21-transmitting probe; 211-transmitting probe shell; 212-transmitting probe upper cover; 213-transmitting probe permanent magnet; 214-transmitting probe center column;

[0038] 22-receiving probe; 221-receiving probe shell; 222-receiving probe upper cover; 223-receiving probe lower cover; 224-receiving probe permanent magnet; 225-receiving probe center column;

[0039] 23-first connecting rod; 231-first connecting rod body; 24-second connecting rod; 241-second connecting rod body; 25-third connecting rod; 251-third connecting rod body; 26-female connector; 27-male connector. DETAILED DESCRIPTION

[0040] In order to facilitate understanding, the internal detection device of the pressure vessel heat exchange pipe provided by the embodiment of the utility model is described in detail below in combination with the drawings of the specification.

[0041] The embodiment of the utility model provides a kind of internal detection device of pressure vessel heat exchange pipe, as shown in Figures 1-3 It includes: detection host computer A and detection probe B, detection host computer A is placed in the outside of the pipe to be detected, and detection probe B is placed in the inside of the pipe to be detected;

[0042] Detection host computer A includes: measurement control circuit 11 and receiving amplifier circuit 12, measurement control circuit 11 is connected with transmitting circuit 13, and transmitting circuit 13 is used to drive the detection coil inside the transmitting probe 21 in detection probe B to emit ultrasonic guided wave signal, receiving amplifier circuit 12 is used to amplify the millivolt level voltage signal received by receiving probe 22 in detection probe B to volt level, receiving amplifier circuit 12 is connected with signal acquisition circuit 14, and signal acquisition circuit 14 is connected with result display circuit 15;

[0043] Detection probe B includes: transmitting probe 21, transmitting probe 21 is connected with first connecting rod 23, first connecting rod 23 is connected with second connecting rod 24, second connecting rod 24 is connected with receiving probe 22, and receiving probe 22 is connected with third connecting rod 25;Wherein, transmitting probe 21, receiving probe 22, second connecting rod 24 and third connecting rod 25 have female connector 26 respectively, first connecting rod 23, second connecting rod 24 and third connecting rod 25 have male connector 27 respectively, and the male connector 27 and / or female connector 26 between the same components are connected by wire, and the male connector 27 and female connector 26 of different components are correspondingly inserted.

[0044] Compared with the prior art, the internal detection device of the pressure container heat exchange pipe has the following advantages:

[0045] The internal detection device of the pressure container heat exchange pipe provided in the embodiment of the utility model, since the transmitting probe and the receiving probe can determine the specific position of the detection probe in the internal pipe under the action of the first, second and third connecting rods, that is, the ultrasonic guided wave can propagate along the pipe axial direction on the pipe wall between the transmitting probe and the receiving probe, so that the entire pipe range between the transmitting probe and the receiving probe can be detected at one time; in other words, the internal detection device of the pressure container heat exchange pipe provided in the embodiment of the utility model utilizes the electromagnetic ultrasonic mode to excite the ultrasonic guided wave in the heat exchange pipe, the position of the transmitting probe and the receiving probe can be flexibly set in the heat exchange pipe according to the detection requirement, and the excited ultrasonic guided wave propagates along the axial direction in the heat exchange pipe wall, so that the entire pipe wall between the transmitting probe and the receiving probe can be covered in one detection, thereby having very high detection efficiency; in addition, the transmission of the acoustic wave between the transmitting probe, the receiving probe and the detected pipe can be realized without the aid of the ultrasonic coupling agent.

[0046] The measurement control circuit 11 can be built based on an ARM chip and an FPGA chip system, and is used for controlling the synchronization and coordination of the whole detection device; and the ARM chip can control the FPGA chip to output a square wave pulse to the transmitting circuit 13 for signal transmission.

[0047] The transmitting circuit 13 can be used for power amplification of the transmitted signal; the square wave pulse output by the measurement control circuit 11 is amplified by the amplification of the switch driving circuit and the high voltage circuit in the transmitting circuit 13, so that the excitation signal can be amplified to a high voltage pulse of ±300V or above, and the detection coil in the transmitting probe 21 is driven to transmit the ultrasonic guided wave signal.

[0048] Specifically, the receiving amplification circuit 12 can be composed of an amplification chip and a filter chip, and is used for amplifying the millivolt-level voltage signal received by the receiving probe 22 to a volt-level;

[0049] The signal acquisition circuit 14 can be composed of a data acquisition chip and an FPGA chip system, and is used for collecting and storing the voltage signal output by the receiving amplification circuit 12;

[0050] The result display circuit 15 can be composed of a liquid crystal display screen, and the display content is controlled by the ARM chip system of the measurement control circuit 11, and the ultrasonic guided wave signal collected by the signal acquisition circuit 14 is displayed in the form of a detection waveform; wherein the abscissa can be the waveform propagation time, and the ordinate can be the signal amplitude.

[0051] Further, as shown in Figure 3As shown, the transmitting probe 21 can include a transmitting probe shell 211 and a transmitting probe upper cover 212 matched and docked with the transmitting probe shell 211; and the inside of the transmitting probe shell 211 can be sequentially provided with a transmitting probe permanent magnet 213, a transmitting probe center column 214, and the transmitting probe permanent magnet 213 from bottom to top; meanwhile, the transmitting probe upper cover 212 is connected with a female joint 26, and the inside of the female joint 26 can have two electrodes which can be respectively connected with two ends of a lacquered coil wound outside the transmitting probe center column 214.

[0052] Further, the electrodes inside the female joint 26 and the lacquered coil outside the center column of the transmitting probe 21 can be connected by welding, and the female joint 26 and the transmitting probe upper cover 212 can be connected by bonding; the upper center blind hole of the transmitting probe upper cover 212 can have internal threads, the lower boss can have external threads, and the transmitting probe upper cover 212 and the transmitting probe shell 211 can be connected by threads;

[0053] The transmitting probe permanent magnet 213 can be adsorbed on both ends of the transmitting probe center column 214 by magnetic force, the lacquered coil wound outside the transmitting probe center column 214 serves as the detection coil, and both ends of the detection coil can pass through the gap between the transmitting probe permanent magnet 213 and the transmitting probe shell 211 and be welded with the electrodes inside the female joint 26.

[0054] Further, as shown, Figure 4 The receiving probe 22 can include a receiving probe shell 221, a receiving probe upper cover 222 and a receiving probe lower cover 223 matched and docked with the receiving probe shell 221; and the inside of the receiving probe shell 221 can be sequentially provided with a receiving probe permanent magnet 224, a receiving probe center column 225, and the receiving probe permanent magnet 224 from bottom to top; meanwhile, the receiving probe upper cover 222 is connected with a female joint 26, and the receiving probe lower cover 223 is connected with two female joints 26, and the two electrodes inside one female joint 26 in the receiving probe lower cover 223 can be respectively connected with two ends of a lacquered coil wound outside the receiving probe center column 225.

[0055] Further, the female joint 26 and the receiving probe upper cover 222 and the receiving probe lower cover 223 can be respectively connected by bonding; the upper center blind hole of the receiving probe upper cover 222 and the receiving probe lower cover 223 can respectively have internal threads, the lower boss can respectively have external threads, and the receiving probe upper cover 222 and the receiving probe lower cover 223 and the receiving probe shell 221 can be respectively connected by threads;

[0056] The center of the receiving probe permanent magnet 224 and the receiving probe center column 225 can have a through hole respectively, the receiving probe permanent magnet 224 can be adsorbed on both ends of the receiving probe center column 225 by magnetic force, the enamel-coated coil wound outside the receiving probe center column 225 serves as the detection coil, and both ends of the detection coil can pass through the gap between the receiving probe permanent magnet 224 and the receiving probe shell 221 and be welded with the electrode inside one of the female connectors 26 mounted on the receiving probe lower cover 223; meanwhile, the female connector 26 mounted on the receiving probe upper cover 222 and the electrode between the other female connector 26 mounted on the receiving probe lower cover 223 can be connected by a wire, and the wire can pass through the through holes of the receiving probe permanent magnet 224 and the receiving probe center column 225.

[0057] Further, as shown in the drawings, Figure 5 The first connecting rod 23 can include a first connecting rod body 231, and both ends of the first connecting rod body 231 can have a cylindrical boss provided with external threads; the first connecting rod body 231 has a through hole, and both ends of the through hole are respectively inserted and fixed with a male connector 27, and the through hole can be used to pass the wire between the two male connectors 27; in addition, the outer diameter of the male connector 27 is slightly larger than the diameter of the through hole, and in the field, the male connector 27 is pulled out of the through hole and inserted into the corresponding female connector 26.

[0058] Further, as shown in the drawings, Figure 6 The second connecting rod 24 can include a second connecting rod body 241, and one end of the second connecting rod body 241 can have a cylindrical boss and the other end can have a groove, the cylindrical boss is provided with external threads, and the groove has internal threads; the second connecting rod body 241 has a through hole, and the through hole at one end of the cylindrical boss is inserted and fixed with a male connector 27, and the through hole at one end of the groove is adhesively fixed with a female connector 26, and the through hole can be used to pass the wire between the male connector 27 and the female connector 26.

[0059] Further, as shown in the drawings, Figure 7 The third connecting rod 25 can include a third connecting rod body 251, and one end of the third connecting rod body 251 can have a cylindrical boss and the other end can have a groove, the cylindrical boss is provided with external threads, and the groove has internal threads; the third connecting rod body 251 has two through holes, and both ends of the cylindrical boss are respectively inserted and fixed with a male connector 27, and both ends of the groove are respectively adhesively fixed with a female connector 26, and the two through holes can be respectively used to pass the wire between the corresponding male connector 27 and female connector 26.

[0060] Further, the materials of the transmitting probe shell and the receiving probe shell can be polytetrafluoroethylene, the materials of the transmitting probe upper cover, the receiving probe upper cover and the receiving probe lower cover can be aluminum alloy, the materials of the transmitting probe permanent magnet and the receiving probe permanent magnet can be neodymium iron boron, the materials of the transmitting probe center column and the receiving probe center column can be carbon steel, the materials of the female joint and the male joint can be stainless steel, and the materials of the first connecting rod, the second connecting rod and the third connecting rod can be polytetrafluoroethylene.

[0061] The installation and use of the internal detection device of the pressure vessel heat exchange pipe provided by the embodiment of the utility model will be described in detail as follows:

[0062] 1. Assembling the transmitting probe: (1) winding the detection coil on the outer surface of the transmitting probe center column; (2) adsorbing the two transmitting probe permanent magnets to the two ends of the transmitting probe center column; (3) putting the transmitting probe permanent magnet and the transmitting probe center column into the transmitting probe shell, and passing the two ends of the detection coil through the gap between the transmitting probe permanent magnet and the transmitting probe shell, and then through the side hole of the transmitting probe upper cover; (4) screwing the transmitting probe upper cover into the transmitting probe shell, and connecting them through threads; (5) connecting the two electrodes of the female joint with the two ends of the detection coil by welding; (6) connecting the female joint to the side hole of the transmitting probe upper cover by adhesion;

[0063] 2. Assembling the receiving probe: (1) winding the detection coil on the outer surface of the receiving probe center column; (2) adsorbing the two receiving probe permanent magnets to the two ends of the receiving probe center column; (3) screwing the receiving probe upper cover into the receiving probe shell, and connecting them through threads; (4) putting the receiving probe permanent magnet and the receiving probe center column into the receiving probe shell, and passing the two ends of the detection coil through the gap between the receiving probe permanent magnet and the receiving probe shell, and then through one side hole of the receiving probe lower cover, and marking the receiving probe interface; (5) passing the connecting wire between the female joint installed on the receiving probe upper cover and the female joint installed on the receiving probe lower cover through the side hole of the receiving probe upper cover, the center hole of the receiving probe permanent magnet, the center hole of the receiving probe center column, the center hole of the receiving probe permanent magnet and the second side hole of the receiving probe lower cover in sequence; (6) screwing the receiving probe lower cover into the receiving probe shell, and connecting them through threads; (7) connecting the two electrodes of the first female joint of the receiving probe lower cover with the two ends of the detection coil by welding, and connecting the two electrodes of the second female joint of the receiving probe lower cover with the connecting wire respectively; (8) pasting the three female joints into the corresponding mounting holes of the receiving probe upper cover and the receiving probe lower cover by adhesion;

[0064] 3. Complete the assembly of the first connecting rod, the second connecting rod and the third connecting rod: (1) Complete the welding of the first connecting rod 2 male connectors and 2 connecting wires, first connect the 2 electrodes of the first male connector with the 2 connecting wires at one end by welding, then pass the 2 connecting wires through the side hole of the first connecting rod, and connect the other end of the 2 connecting wires with the 2 electrodes of the second male connector by welding; Finally, insert the 2 male connectors into the side holes at both ends of the first connecting rod, the length of the 2 connecting wires is greater than the length of the side hole, and when the male connector is connected with the female connector, pull the male connector out of the side hole; (2) Complete the welding of the second connecting rod 1 male connector, 1 female connector and 2 connecting wires, first connect the 2 electrodes of the male connector with the 2 connecting wires at one end by welding, then pass the 2 connecting wires through the side hole of the second connecting rod, and connect the other end of the 2 connecting wires with the 2 electrodes of the female connector by welding; Finally, use adhesive to fix the female connector to the side hole end of the second connecting rod body adjacent to the lower groove, and insert the male connector into the side hole end of the second connecting rod body adjacent to the upper cylinder; (3) Complete the welding of the third connecting rod 2 male connectors, 2 female connectors and 4 connecting wires respectively by the same method as step (2) in this paragraph, and complete the connection of the male connector, the female connector and the third connecting rod body;

[0065] 4. Complete the assembly of the entire detection device: complete the connection of the entire device according to Figure 2 Insert the protruding cylinder at one end of the first connecting rod into the groove of the upper cover of the transmitting probe, and connect them by threads; insert the protruding cylinder at the other end of the first connecting rod into the groove of the second connecting rod, and connect them by threads; insert the protruding cylinder of the second connecting rod into the groove of the upper cover of the receiving probe, and connect them by threads; insert the protruding cylinder of the third connecting rod into the groove of the lower cover of the receiving probe, and connect them by threads;

[0066] 5. The most basic configuration is to connect the transmitting probe, the receiving probe and the first connecting rod, and the second connecting rod and the third connecting rod can be flexibly set according to the needs of on-site detection;

[0067] 6. After connecting, insert the adjacent male connectors into the female connectors respectively, the 2 female connectors at the bottom of the third connecting rod correspond to the interfaces of the transmitting probe and the receiving probe respectively, and use the connecting wires to connect the interfaces of the transmitting probe and the receiving probe with the transmitting circuit and the receiving amplification circuit respectively according to Figure 2 Figure 1

[0068] ​​The above merely describes a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An internal detection device for heat exchange tubes of a pressure vessel, characterized in that, The utility model relates to a kind of ultrasonic guided wave detection device, including: Detection host and detection probe, the detection host is placed in the outside of the pipe to be detected, and the detection probe is placed in the inside of the pipe to be detected; The detection host includes: measurement control circuit and receiving amplification circuit, the measurement control circuit is connected with transmitting circuit, and the transmitting circuit is used to drive the detection coil inside the transmitting probe in the detection probe to emit ultrasonic guided wave signal, the receiving amplification circuit is used to amplify the millivolt level voltage signal received by the receiving probe in the detection probe to volt level, the receiving amplification circuit is connected with signal acquisition circuit, and the signal acquisition circuit is connected with result display circuit; The detection probe includes: the transmitting probe, the transmitting probe is connected with first connecting rod, the first connecting rod is connected with second connecting rod, the second connecting rod is connected with the receiving probe, and the receiving probe is connected with third connecting rod;Wherein, the transmitting probe, the receiving probe, the second connecting rod and the third connecting rod have female joint respectively, the first connecting rod, the second connecting rod and the third connecting rod have male joint respectively, and the male joint and / or the female joint between the same components are connected by wire, and the male joint and the female joint between different components are inserted correspondingly.

2. The apparatus for inspecting the inside of a heat exchange tube of a pressure vessel according to claim 1, wherein The measurement control circuit is built based on ARM chip and FPGA chip system, for controlling the synchronous coordination of whole detection device;The ARM chip controls the FPGA chip to output square wave pulse to the transmitting circuit for signal emission; The transmitting circuit is used to realize power amplification of transmitting signal, and the square wave pulse output by the measurement control circuit is amplified to high-voltage pulse above ±300V by the amplification of switch driving circuit and high-voltage circuit in the transmitting circuit, and drives the detection coil inside the transmitting probe to emit ultrasonic guided wave signal.

3. The apparatus for inspecting the inside of a heat exchange tube of a pressure vessel according to claim 2, wherein The receiving amplification circuit is composed of amplification chip and filter chip, for amplifying the millivolt level voltage signal received by the receiving probe to volt level; The signal acquisition circuit is composed of data acquisition chip and FPGA chip system, for being responsible for collecting and storing voltage signal output by receiving amplification circuit; The result display circuit is composed of liquid crystal display screen, and the display content is controlled by the ARM chip system of the measurement control circuit, and meanwhile ultrasonic guided wave signal collected by the signal acquisition circuit is displayed in the form of detection waveform;Wherein, abscissa is waveform propagation time, and ordinate is signal amplitude.

4. The apparatus for inspecting the inside of a pressure vessel heat exchange tube according to any one of claims 1 to 3, characterized in that, The transmitting probe includes: transmitting probe shell and transmitting probe upper cover matched with the transmitting probe shell;The inside of the transmitting probe shell is sequentially provided with transmitting probe permanent magnet, transmitting probe center column and transmitting probe permanent magnet from bottom to top;The female joint is connected with the transmitting probe upper cover, and the inside of the female joint has two electrodes, and the two electrodes are connected with two ends of the enamel wire coil wound around the transmitting probe center column respectively.

5. The apparatus for inspecting the inside of a heat exchange tube of a pressure vessel according to claim 4, wherein The electrode inside the female joint is connected with the enameled coil outside the center column of the transmitting probe by welding, and the female joint is connected with the upper cover of the transmitting probe by adhesion. The permanent magnet of the transmitting probe is adsorbed on both ends of the center column of the transmitting probe by magnetic force, the enameled coil wound outside the center column of the transmitting probe serves as the detection coil, and both ends of the detection coil pass through the gap between the permanent magnet of the transmitting probe and the shell of the transmitting probe and are welded with the electrode inside the female joint.

6. The apparatus for inspecting the inside of a pressure vessel heat exchange tube according to any one of claims 1 to 3, characterized by The receiving probe comprises a receiving probe shell, a receiving probe upper cover and a receiving probe lower cover which are matched and docked with the receiving probe shell; the inside of the receiving probe shell is sequentially provided with a receiving probe permanent magnet, a receiving probe center column and a receiving probe permanent magnet from bottom to top; the receiving probe upper cover is connected with one female joint, the receiving probe lower cover is connected with two female joints, and two electrodes inside one female joint of the receiving probe lower cover are respectively connected with both ends of the enameled coil wound outside the receiving probe center column.

7. The apparatus for inspecting the inside of a heat exchange tube of a pressure vessel according to claim 6, wherein The female joint is connected with the receiving probe upper cover and the receiving probe lower cover by adhesion respectively; the upper center blind hole of the receiving probe upper cover and the receiving probe lower cover respectively has internal threads, and the lower boss respectively has external threads, and the receiving probe upper cover and the receiving probe lower cover are respectively connected with the receiving probe shell by threads; The receiving probe permanent magnet and the receiving probe center column respectively have through holes in the center, the receiving probe permanent magnet is adsorbed on both ends of the receiving probe center column by magnetic force, the enameled coil wound outside the receiving probe center column serves as the detection coil, both ends of the detection coil pass through the gap between the receiving probe permanent magnet and the receiving probe shell and are welded with the electrode inside the female joint installed on the receiving probe lower cover; at the same time, the female joint installed on the receiving probe upper cover is connected with the electrode of the other female joint installed on the receiving probe lower cover through a wire, and the wire passes through the through holes of the receiving probe permanent magnet and the receiving probe center column.

8. The apparatus for inspecting the inside of a pressure vessel heat exchange tube according to any one of claims 1 to 3, characterized by The first connecting rod comprises a first connecting rod body, and both ends of the first connecting rod body have cylindrical bosses provided with external threads; the first connecting rod body has a through hole, and both ends of the through hole are respectively inserted and fixed with the male joints, and the through hole is used for passing the wire between the two male joints.

9. The apparatus according to any one of claims 1 to 3, wherein The second connecting rod comprises a second connecting rod body, one end of the second connecting rod body is provided with a cylindrical boss, the other end of the second connecting rod body is provided with a groove, the cylindrical boss is provided with external threads, and the groove is provided with internal threads; the second connecting rod body is provided with a through hole, the male joint is fixedly inserted into one end of the cylindrical boss, the female joint is fixedly bonded into one end of the groove, and the through hole is used for penetrating the wires between the male joint and the female joint.

10. The apparatus for inspecting the inside of a heat exchange tube of a pressure vessel according to any one of claims 1 to 3, characterized in that, The third connecting rod comprises a third connecting rod body, one end of the third connecting rod body is provided with a cylindrical boss, the other end of the third connecting rod body is provided with a groove, the cylindrical boss is provided with external threads, and the groove is provided with internal threads; the third connecting rod body is provided with two through holes, the male joint is fixedly inserted into one end of the cylindrical boss, the female joint is fixedly bonded into one end of the groove, and the two through holes are respectively used for penetrating the wires between the corresponding male joint and female joint.

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