KR102611552B1 - Guide device for ECT inspection of heat exchanger tubes - Google Patents

Abstract

The present invention relates to a guide device for ECT inspection of heat exchanger tubes, which includes a support positioned in a horizontal direction, a floor fixture that supports the lower side of the support and is fixed to the bottom of a wall, the inlet and withdrawal device, and the support. A guide device for ECT examination of the heat exchanger tube including an attachment table installed to be transportable along the support, a transfer part for transporting the attachment along the support, and a lifting part installed on the floor fixture to raise and lower the support. to provide.
According to the present invention as described above, the ECT (Eddy Current Test) inspection probe and cable entry/extraction device for health evaluation inside the heat exchanger tube are easily and accurately guided to the tube subject to non-destructive testing, and the occurrence of missing tubes is prevented. It is a very useful and effective invention that improves work efficiency by preventing and reducing worker fatigue.

Description

Guide device for ECT inspection of heat exchanger tubes}

The present invention relates to a guide device for ECT inspection of heat exchanger tubes, and more specifically, to a probe and cable entry and exit device for ECT (Eddy Current Test) inspection for health evaluation of heat exchanger tubes from which tubing water and foreign substances have been removed. This relates to a guide device for ECT inspection of heat exchanger tubes that can easily and accurately transport tubes to prevent missing tubes and reduce operator fatigue.

Heat exchangers installed in petrochemical plants, nuclear power plants, or thermal power plants are composed of many tubes, and these tubes are regularly evaluated for safety through non-destructive testing methods such as ECT to prevent problems during operation.

Conventionally, non-destructive testing such as ECT is performed by attaching a probe such as ECT to a cable and inserting it into the tube to be inspected, usually using an air gun to transport it to the other side and then pulling it out. In addition, a feed gun that uses a feed device equipped with a motor has been previously released, but the feed gun is heavy at more than 5 kg and has had many inconveniences, such as a slow withdrawal (inspection) speed due to the motor's limit when withdrawing the probe.

In addition, since a minimum of 2098 to 2400 arranged tubes are manually inspected, there is a high possibility of missing tubes being inspected, and if an omission occurs, the tubes in the corresponding row must be retested, which increases work time.

In particular, the tube length is approximately 18m for nuclear power plants and approximately 8~12m for thermal power plants, and the speed regulation when withdrawing the probe from within the tube is 2m/s for nuclear power plants and 4~5m/s for thermal power plants, so it is constant. The principle is that the probe is withdrawn at a speed, but since the probe is withdrawn manually, the speed is irregular, reducing the reliability of the inspection.

In addition, the body diameter of the heat exchanger is ϕ1650 or more, and the tube diameter is various, such as ϕ16.55 and ϕ19. When manually pulling out long cables, cable tangles occur, which causes problems such as inspection delays and cable damage.

In addition, in the working environment, worker fatigue increases due to poor posture due to having to handle air guns and hoses in narrow places, and the basic time required for inspection per tube is 3 to 5 seconds, so even assuming that the inspection progresses smoothly, heat exchange It takes about 3 days per machine, so the fatigue of workers is very high.

Accordingly, the probe and cable for non-destructive testing can be easily and safely inserted and withdrawn into and out of the tube, but the inspection is conducted in a certain inspection order without tubes missing from inspection, thereby improving inspection reliability. There is an increasing demand for the development of technology that can easily guide devices and tubes to protect workers' hygiene in harsh environments caused by water jetting, as well as prevent missing inspections of multiple tubes. am.

Korean Patent No. 10-2269838

Accordingly, the present invention was devised to solve the above problems, and its purpose is to provide an ECT (Eddy Current Test) inspection probe and cable insertion and withdrawal device for health evaluation with a heat exchanger tube easily and accurately in a specified order. The goal is to provide a guide device for ECT inspection of heat exchanger tubes that can prevent the occurrence of missing tubes by transporting them and reduce operator fatigue.

The technical object of the present invention as described above is achieved by the following means.

(1) The inlet and outlet device for the probe and cable for ECT inspection within the heat exchanger tube is transferred to each tube,

A support bar positioned in a horizontal direction;

A floor fixture that supports the lower side of the support and is fixed to the bottom of the wall;

an attachment table on which the incoming and outgoing device is installed and can be transported along the support;

a transfer unit for transporting the attachment along the support; and

A guide device for ECT examination of a heat exchanger tube including a lifting part installed on the floor fixture to raise and lower the support.

(2) In (1) above, the support is

A guide device for ECT examination of a heat exchanger tube, further comprising a support extension part so that the length of each end can be expanded.

(3) In (2) above, the support extension is

a support entrance/exit hole formed inside an end of the support; and

It includes an extension support that is mounted to enable entry and exit from the support hole,

A guide device for ECT examination of a heat exchanger tube, characterized in that at least one extension support is included to extend the length of the support.

(4) In (3) above, the lifting unit

A guide device for ECT inspection of heat exchanger tubes, characterized by at least one of a cylinder and a link-type lift.

(5) In (1) above,

A guide device for ECT examination of a heat exchanger tube, further comprising a clamping portion for fixing the attachment table.

(6) In (5) above, the clamping unit

A guide device for ECT examination of heat exchanger tubes, characterized by a magnetic chuck.

(7) In (1) above,

A tube sensing unit mounted on the attachment table to detect a tube to be inspected; and

A guide device for ECT examination of a heat exchanger tube, further comprising a transfer control unit that receives a signal from the tube sensing unit to control the transfer unit and the lifting unit.

(8) In (7) above, the attachment stand is

A guide device for ECT examination of heat exchanger tubes, characterized in that the tube is sequentially transferred from the tube located on the leftmost side of the horizontal row of tubes to be tested to each tube arranged on the right.

(9) In (8) above, the tube sensing unit

A first tube sensor (871) mounted on the upper part of the attachment table; and

A guide device for ECT examination of a heat exchanger tube, comprising a second tube sensor mounted on one or more of the left and right sides of the attachment table.

According to the guide device for ECT inspection of heat exchanger tubes according to the present invention, the probe and cable entry and exit device for ECT (Eddy Current Test) inspection for health evaluation of heat exchanger tubes are easily and accurately guided to prevent the occurrence of missing tubes. It is a very useful and effective invention that improves work efficiency by preventing and reducing worker fatigue.

Figure 1 is a diagram showing the configuration of a guide device for ECT examination of heat exchanger tubes according to the present invention.
Figure 2 is a diagram showing the configuration of the support extension portion of the guide device according to an embodiment of the present invention;
Figure 3 is a diagram showing the configuration of an inlet and outlet device mounted on a guide device according to an embodiment of the present invention;
Figure 4 is a diagram showing the internal configuration of an inlet and outlet device according to an embodiment of the present invention;
Figure 5 is a diagram showing the configuration of a cable guide according to an embodiment of the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings. The detailed description set forth below in conjunction with the accompanying drawings is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced. The following detailed description includes specific details to provide a thorough understanding of the invention. However, those skilled in the art will recognize that the present invention may be practiced without these specific details.

In some cases, in order to avoid ambiguity of the concept of the present invention, well-known structures and devices may be omitted or may be shown in block diagram form focusing on the core functions of each structure and device.

Throughout the specification, when a part is said to “comprise or include” a certain element, this means that it does not exclude other elements but may further include other elements, unless specifically stated to the contrary. do. Additionally, the term “… unit” used in the specification refers to a unit that processes at least one function or operation. In addition, the terms "a or an", "one", "the", and similar related terms are used in the context of describing the invention (particularly in the context of the claims below) as used herein. It may be used in both singular and plural terms, unless indicated otherwise or clearly contradicted by context.

In describing embodiments of the present invention, if a detailed description of a known function or configuration is judged to unnecessarily obscure the gist of the present invention, the detailed description will be omitted. The terms described below are terms defined in consideration of functions in the embodiments of the present invention, and may vary depending on the intention or custom of the user or operator. Therefore, the definition should be made based on the contents throughout this specification.

Hereinafter, preferred embodiments of the present invention will be described with reference to the attached drawings.

Figure 1 is a diagram showing the configuration of a guide device for ECT examination of a heat exchanger tube according to the present invention, Figure 2 is a diagram showing the configuration of the support extension portion of the guide device according to an embodiment of the present invention, and Figure 3 is a diagram showing the configuration of the guide device for ECT examination of the heat exchanger tube according to the present invention. It is a diagram showing the configuration of an inlet and withdrawal device mounted on a guide device according to an embodiment of the invention, Figure 4 is a diagram showing the internal configuration of an inlet and withdrawal device according to an embodiment of the present invention, and Figure 5 is an embodiment of the present invention. This is a diagram showing the configuration of a cable guide according to an example.

As shown in Figure 1, the guide device 800 for ECT examination of the heat exchanger tube in the embodiment of the present invention (hereinafter abbreviated as "guide device") is used for inserting and inserting probes and cables for ECT examination within the heat exchanger tube. By transferring the withdrawal device 700 (hereinafter abbreviated as “input/output device”) to each tube, work efficiency can be improved by accurately transferring the inlet and withdrawal device 700 to the tube.

The guide device 800 of the present invention includes a support 810, a floor fixture 820, an attachment 830, a transfer unit 840, and an elevation unit 850.

In the present invention, the support 810 has a certain length and is preferably positioned horizontally in front of the row of tubes 20.

In the present invention, the floor fixture 820 supports the lower side of the support 810 and is preferably fixed to the bottom of the wall.

In the present invention, the attachment stand 830 is equipped with the retraction/withdrawal device 700 and is installed to be transportable along the support stand 810.

In the present invention, the transfer unit 840 transfers the attachment base 830 along the support base 810. As the attachment base 830 is transferred, the insertion/withdrawal device 700 is also transferred. It is done.

In the present invention, the lifting unit 850 is mounted on the floor fixture 820 to raise and lower the support 810 and elevates the support 810 on which the attachment 830 is mounted.

In an embodiment of the present invention, the support 810 further includes a support extension portion 811 so that the length of each end can be expanded, as shown in FIG. 2.

In an embodiment of the present invention, the support extension 811 may take various forms, and preferably includes a support entrance/exit hole 8111 and an extension support 8112.

In one embodiment, the support entrance/exit hole 8111 is formed inside the end of the support 810, and the extension support 8112 is installed to be able to enter/exit the support entrance/exit hole 8111. Of course, the extension length of the extended support 8112 is set according to the position of the tube 20, and a stopper (not shown) may be included to prevent it from leaving the support hole 8111.

In an embodiment of the present invention, at least one extension support 8112 is included. For example, when two extension supports 8112 and 8122 are included, preferably, a support entrance/exit hole (8112) is provided inside the extension support 8112 at one unit position. 8121) is formed.

In an embodiment of the present invention, the transfer unit 840 includes a transfer rail 841, a transfer block 842, and a transfer drive unit 843.

In an embodiment of the present invention, the transfer rail 841 is installed on the support 810, and the transfer block is installed on the attachment base 830 to move along the transfer rail. Preferably, the transfer rail 841 (or extension transfer rail) mounted on the extension supports 8112 and 8122 protrudes as much as a step in the process of exiting the support hole on the extension support by an elastic member provided at the lower part. , the step between the support and the extension support can be resolved by lowering and storing it during the entry process. Of course, various means for correcting this step can be adopted as other embodiments of the present invention, and the above embodiment is only an example for understanding.

In an embodiment of the present invention, the transfer drive unit 843 transfers the transfer block, and the attachment base 830 can be easily transferred along the support base 810.

In an embodiment of the present invention, the lifting unit 850 may use various mechanisms, examples of which include a cylinder and a link-type lift. Preferably, the lifting unit 850 is mounted on the floor fixture 820, and the support 810 is mounted on the lifting unit 850.

The guide device 800 according to the present invention further includes a clamping part 860 to fix the position of the attachment table 830.

In an embodiment of the present invention, the clamping part 860 does not need to be a special device as long as it is used to fix the position of the attachment table 830, and for example, a means such as a magnetic chuck can be adopted.

In the embodiment of the present invention, the attachment 830 does not need to be fixed in a special position, for example, the fixing plate 22, the support 810, or the support extension 811 on which the tube 20 is installed. It can be fixed in any position.

The guide device 800 according to an embodiment of the present invention further includes a tube sensing unit 870 and a transport control unit 880.

In an embodiment of the present invention, the tube sensing unit 870 is mounted on the attachment table 830 to detect a tube that is an inspection target.

In an embodiment of the present invention, the transfer control unit 880 receives a signal from the tube sensing unit 870 and controls the transfer unit 840 and the lifting unit 850.

In an embodiment of the present invention, the attachment table 830 is transported along the support table 810 by the transfer unit 840 and sequentially moves from the tube located at the leftmost position to each tube arranged to the right among the horizontal rows of tubes to be inspected. is transferred to

Alternatively, of course, the transfer order of the attachment table 830 may be reversed or may proceed from the center to each side.

In an embodiment of the present invention, the tube sensing unit 870 preferably includes a first tube sensor 871 and a second tube sensor 872.

As an embodiment of the present invention, the first tube sensor 871 is mounted on the upper part of the attachment stand 830, and the second tube sensor 872 is mounted on one or more of the left and right sides of the attachment stand 830. Can be installed.

At this time, in the embodiment of the present invention, the first tube sensor 871 detects all tubes existing in the corresponding tube row that are subject to non-destructive testing by the inlet/withdrawal device 700, and the second tube sensor 872 All tubes present in the corresponding tube row that are subject to non-destructive testing by the in/out device 700 are detected, and for this purpose, each tube sensor may include an encoder or a position sensor.

In an embodiment of the present invention, the transfer control unit 880 receives a signal from the sensing unit 750 of the inlet/withdrawal device 700, which will be described later, checks the tubes that have been inspected, and guides them sequentially to ensure that no tubes are missing.

In the present invention, the inlet/withdrawal device 700 is a device that can be mounted on the guide device 800 of the present invention, and is used to insert and withdraw a probe and a cable into the tube of a heat exchanger for non-destructive testing using an ECT probe. There is no particular limitation as long as the inspection speed can be kept constant by keeping the withdrawal speed constant.

As an embodiment of the present invention, the input/output device 700, as shown in FIG. 3, preferably includes a body housing 710, a cable delivery unit 720, a cable recovery unit 730, and a cable guide 740. ) includes.

In an embodiment of the present invention, the body housing 710 accommodates the cable delivery unit 720, the cable recovery unit 730, and the cable guide 740 therein.

In an embodiment of the present invention, the cable delivery unit 720 unwinds the cable 30 stored in a wound state inside the body housing 710 and introduces the probe 40 into the tube 20.

In an embodiment of the present invention, the cable recovery unit 730 includes an elastic member and pulls out the cable 30 introduced into the tube 20 by the cable delivery unit 720, preferably using a restoring force. It is wound into the body housing 710.

In an embodiment of the present invention, the cable guide 740 guides the cable 30 delivered by the cable delivery unit 720, and moves the cable 30 drawn out by the cable recovery unit 730 at a constant speed. The transfer speed of the probe 40 is adjusted to be constant.

In an embodiment of the present invention, the body housing 710 includes a winding space 711, an inlet/outlet part 712, a support shaft 713, and a reel 714, as shown in FIG. 4.

In an embodiment of the present invention, the winding space portion 711 is formed inside the body housing 710 to receive the cable 30 by winding it, and the inlet/outlet portion 712 is the cable 30 connected to the body housing ( 710) It is formed in the lower part of the body housing 710 as a part that is brought in/out into the outside/inside.

In an embodiment of the present invention, the support shaft 713 is formed to protrude within the body housing 710 so as to be located in the center of the winding space 711, and the reel 714 is rotatable on the support shaft 713. It is mounted so that the cable 30 is wound.

At this time, in an embodiment of the present invention, one end of the elastic member is fixed to the reel 714 and the other end is fixed to the support shaft 713, so that the reel 714 rotates about the support shaft 713 and the elastic member It is tensioned or compressed.

In an embodiment of the present invention, the cable transmission unit 720 includes a transmission motor 722 that rotates the reel 714.

The delivery motor 722 may preferably be a pneumatic motor. The delivery motor 722 rotates the reel 714 while unwinding the elastic member, thereby causing the wound cable 30 to be unwound. While inserting the probe 40 into the tube 20.

In an embodiment of the present invention, when the binding force of the delivery motor 722 to the reel 714 is released, the cable recovery unit 730 pulls the cable into the tube 20 by the restoring force of the elastic member ( 30) is pulled out, and the drawn cable 30 is wound on a reel 714 and recovered.

In an embodiment of the present invention, the cable guide 740 includes a guide body 741, a guide roller 742, and a guide roller drive unit 743, as shown in FIG. 5.

In an embodiment of the present invention, the guide body 741 has a guide hole 741a therein through which the cable 30 passes, and is installed in the body housing 710.

In an embodiment of the present invention, the guide rollers 742 are disposed at regular intervals along the guide hole 741a and installed on the guide body 741 to transport the cable 30.

In the present invention, the guide roller driving unit 743 rotates one or more of the guide rollers 742 forward and backward, and may be implemented, for example, by an air spindle or pneumatic motor driven by pneumatic pressure.

In an embodiment of the present invention, the cable guide 740 is linked with the cable transmission unit 720 and the cable recovery unit 730.

More specifically, when the cable 30 is transmitted by the cable transmission unit 720 of the present invention, the cable guide 740 allows the cable 30 to be easily inserted into the corresponding tube 20 to be inspected. We guide this so that it can be introduced.

On the contrary, when the cable 30 is pulled out from the tube 20 to be inspected by the cable recovery unit 730 of the present invention, the cable guide 740 adjusts the withdrawal speed of the cable 30 to a preset value. Control the inspection speed by keeping it constant according to the withdrawal speed regulations.

In an embodiment of the present invention, an inlet switch and a withdrawn switch that can operate the cable discharge unit 720 and the cable recovery unit 730 are preferably formed on a predetermined controller (not shown), so that the operator can easily operate them manually. It is desirable to implement it so that it can be done, and of course, making it operate automatically also constitutes an embodiment of the present invention.

In an embodiment of the present invention, the guide rollers 742 are preferably installed in plural numbers, for example, 3 or more rolls, and are arranged at regular intervals in the longitudinal direction of the guide body 741.

In an embodiment of the present invention, each guide roller 742 has a guide groove 742a formed to match the diameter of the cable 30, and the cable 30 is transported in the forward or reverse direction by the guide roller driving unit 743. This allows you to control the incoming/outgoing speed.

The input/withdrawal device 700 according to the present invention may further include a sensing unit 750 and a control unit 760. At this time, the control unit 760 is illustrated as being separated from the transfer control unit 880 in the embodiment of the present invention, but this is only illustrated as being conceptually separated for ease of understanding, and the two are physically composed of one device. Of course you can do it.

In an embodiment of the present invention, the sensing unit 750 detects the position of the probe 40 introduced through one end of the tube 20, and may include an encoder or a position sensor.

In an embodiment of the present invention, the control unit 760 receives a signal from the sensing unit 750, and when the probe 40 is located at the other end of the tube 20, the delivery motor 722 and the guide Control the roller drive unit 743 to stop.

In an embodiment of the present invention, the control unit 760 controls the guide roller driving unit 743 to control the guide roller 742 when the cable 30 is recovered by the restoring force of the elastic member of the cable recovery unit 730. By rotating at a constant speed, the withdrawal speed of the probe 40 that inspects the tube is maintained constant, enabling stable inspection.

In an embodiment of the present invention, the guide roller 742 preferably further includes a pressure sensor 744 for measuring pressure.

In an embodiment of the present invention, if interference or resistance occurs in the probe 40 introduced into the tube 20 by the delivery motor 722 due to unremoved foreign matter that may be present, the pressure sensor 744 detects this, and the control unit 760 receives the detection signal to stop the operation of the delivery motor 722 and the guide roller driving unit 743.

Accordingly, when a predetermined amount of interference or resistance is received during the insertion process of the probe 40, the control unit 760 places the delivery motor 722 and the guide motor 743 into a no-load state, preventing damage to the probe and cable. can be prevented.

In addition, as an embodiment of the present invention, when a change in the pressure sensor 744 is detected in the control unit 760 or the transmission motor 722 and the guide motor 743 are in an unloaded state, a predetermined signal sound is generated. It further includes an alarm unit 745, and the operator can quickly confirm the signal by the signal sound of the alarm unit 745, thereby enabling follow-up response.

20: Tube 800: Guide device
810: support 811: support extension
820: Floor fixture 830: Attachment stand
840: Transfer unit 850: Elevating unit
860: Clamping part 870: Tube sensing part
880: Transfer control unit
700: Input/withdrawal device
710: Body housing 711: Winding space part
712: Input/output part 713: Support axis
714: Reel 720: Cable transmission unit
730: Cable recovery unit 740: Cable guide
750: Sensing unit 760: Control unit

Claims (9)

The inlet and outlet device for the probe and cable for ECT inspection within the heat exchanger tube is transferred to each tube.
A support bar positioned in a horizontal direction;
A floor fixture that supports the lower side of the support and is fixed to the bottom of the wall;
an attachment table on which the incoming and outgoing device is installed and can be transported along the support;
a transfer unit for transporting the attachment along the support; and
It includes a lifting part installed on the floor fixture to raise and lower the support,
The support further includes a support extension portion so that the length of each end can be expanded,
The support extension portion includes a support entrance/exit hole formed inside an end of the support and an extension support mounted to be able to enter/exit the support entrance/exit hole, and the extension support includes at least one extension support to extend the length of the support. A guide device for ECT examination of heat exchanger tubes. delete delete The method of claim 1, wherein the lifting unit
A guide device for ECT inspection of heat exchanger tubes, characterized by at least one of a cylinder and a link-type lift. According to clause 1,
A guide device for ECT examination of a heat exchanger tube, further comprising a clamping portion for fixing the attachment table. The method of claim 5, wherein the clamping unit
A guide device for ECT examination of heat exchanger tubes, characterized by a magnetic chuck. According to clause 1,
A tube sensing unit mounted on the attachment table to detect a tube to be inspected; and
A guide device for ECT examination of a heat exchanger tube, further comprising a transfer control unit that receives a signal from the tube sensing unit to control the transfer unit and the lifting unit. The method of claim 7, wherein the attachment stand
A guide device for ECT examination of heat exchanger tubes, characterized in that the tube is sequentially transferred from the tube located on the leftmost side of the horizontal row of tubes to be tested to each tube arranged on the right. The method of claim 8, wherein the tube sensing unit
A first tube sensor (871) mounted on the upper part of the attachment table; and
A guide device for ECT examination of heat exchanger tubes, comprising a second tube sensor mounted on at least one of the left and right sides of the attachment table.

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