KR100351663B1 - Air Gun for Test Eddy Current - Google Patents

Abstract

The present invention relates to an air gun for eddy current inspection, the handle shaft having a drive shaft to rotate by the air pressure inside the handle housing, and the drive shaft while being spaced apart and installed so as to face each other the upper surface of the seating member to be seated on the upper portion of the handle body A drawing body provided with first and second drawing members, respectively, to move the cable backwards with the rotational force of the drawing body; The structure is composed of a cable guide body which is provided for smooth conveyance of the cable to the other side corresponding to the injection body, and the eddy current test is performed more accurately by the constant moving speed of the probe member, and thus the reliability of the test result. It is possible to further increase.

Description

Air Gun for Test Eddy Current

The present invention relates to an air gun for eddy current inspection, and more particularly, by having a drawing function operated by air pressure to move the probe member forward and inserted into the heat exchanger tube backward at a constant speed, thereby increasing the reverse speed of the probe member. The present invention relates to an air gun for eddy current inspection, which performs the eddy current inspection more accurately and thus increases the reliability of the inspection result.

In general, in order to ensure the stability of heat exchanger tubes used in nuclear and thermal power plants, the vortex eddy current flowing in the conductor is essentially inspected at regular intervals. The eddy current inspection of the heat exchanger tubes must be examined quickly and accurately. Of course, this is a very important part of improving plant efficiency.

1 is a view illustrating an eddy current inspection apparatus of a heat exchanger tube, and first and second steel supports 14 and 16 are coupled and fixed to both sides of the inspection device 10 and the probe member 12. A pair of coils 18 are spaced apart along the circumference between the first and second steel supports 14 and 16, and the surface of the coils 18 is made of a material for protecting the coils 18. The coating material 20 which consists of this epoxy resin is apply | coated along the circumference.

In addition, one side of the coil 18 and the corresponding probe member 12 is inserted into the cable 22 by a predetermined depth. The other end of the cable 22 receives the measured signal. It is connected to a separate inspection device (not shown) for implementation, and a stopper (not shown) is coupled to a predetermined position of the cable 22 to set the inspection distance of the probe member 12.

Therefore, when the operator wants to check the eddy current of the heat exchanger tube 24 using the inspection apparatus 10, first, the probe member 12 is inserted into the inlet 26 of the heat exchanger tube 24. By using the air gun 28, the high pressure air is blown.

Then, when high-pressure air is blown in the above state, the probe member 12 is moved to the heat exchanger tube 24 while rapidly moving toward the outlet 30 by the high-pressure air.

Then, when the inspector pulls the cable 22 drawn out to the inlet 26 of the heat exchanger tube 24, at the same time, the probe member 12 connected to the cable 22 is connected to the inlet of the heat exchanger tube 24. In the direction of (26), it moves backward and moves, and thus the probe member 12 checks the eddy current present in the heat exchanger tube 24 while moving backward and forward.

However, the conventional air gun 28 as described above can move the probe member 12 to the heat exchanger tube 24, but is provided with a function for moving the probe member 12 back and forth to check the eddy current. Since the inspector pulls the cable 22 to perform the inspection, by pulling the cable 22 by hand, the probe member 12 reverses and moves at an irregular speed, and thus the probe member ( When 12) moves backwards and moves at an irregular speed, the eddy current formed in the heat exchanger tube 24 is incorrectly inspected, and thus there is a problem that the reliability of the test result cannot be secured.

The present invention has been made in order to solve the above problems, the eddy current test is performed more precisely by making the reverse speed of the probe member forward and inserted into the heat exchanger tube to be more accurate, thereby increasing the reliability of the test results The purpose is to provide an air gun for eddy current inspection.

1 is a partial cross-sectional view showing a general eddy current inspection device

Figure 2 is an exploded perspective view showing an air gun for eddy current inspection of the present invention

Figure 3 is a bottom perspective view of the seating member of Figure 2

Figure 4 is a perspective view of the combination of the air gun for eddy current inspection showing the cover removed

5 is a bottom perspective view showing the present invention

6 is a plan view showing the forward movement of the probe member

7 is a plan view showing the backward movement of the tamping member

<Explanation of symbols for the main parts of the drawings>

10: inspection device 12: probe member

14: first steel support 16: second steel support

18: coil 20: coating material

22 cable 24 heat exchange tube

26: inlet 28: air gun

30 outlet 50 eddy current inspection air gun

52 handle housing 54 support member

56: handle body 60: first drawing member

62; 2nd drawing member 64: drawing body

66: injection nozzle 68: injection body

70: cable guide body 72, 146: connecting cock

74: inflow cock 76: supply cock

78: open / close switch 80: drawing trigger

82,110 Hinge pin 84 Torque regulator

88: speed controller 90,120: connection hose

92: receiving portion 94: the first receiving groove

96: second receiving groove 98: impeller

100: drive shaft 102: seating member

104: first protrusion 106: second protrusion

108: first bracket 112,124: roller

114: moving member 116: rod

118: air cylinder 122: the second bracket

126: rotation axis 128: gear

130,136: Bearing 132: Reduction Gear

134: drive adapter 138: incision

140: spray housing 142: support surface

144: push trigger 148: cover

150,154,156: receiving groove 152: injection hole

158: road pin

The present invention for achieving the above object is a handle body having a drive shaft that rotates by pneumatic pressure in the interior of the handle housing, while being spaced apart and installed so as to face each other on the upper surface of the seating member seated on the upper portion of the handle shaft. A drawing body having a first and a second drawing member for moving the cable backwards with rotational force, and a spraying body provided with a spray nozzle at one side so that air is injected in a state where the cable is accommodated on one side of the seating member of the drawing body; It is composed of cable guide body which is equipped for smooth conveying of cable to the other side corresponding to the injection body, and it performs the eddy current test more accurately by constant the reverse speed of the probe member, thus increasing the reliability of the test result. It is characteristic in that it exists.

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

2 to 7 is a view showing the air gun for eddy current inspection of the present invention, the same reference numerals as in the accompanying example drawing 1 shows the same configuration, so the description thereof will be omitted and different from FIG. Only the description will be given.

Reference is made to the accompanying drawings, FIGS. 2 to 7.

First, referring to the configuration of the eddy current inspection air gun 50, first, the handle body 56 having a support member 54 on the upper portion of the handle housing 52, and the cable 22 on the upper portion of the handle body 56 In order to move backward, the drawing bodies 64 each having the first and second drawing members 60 and 62 and the cable 22 are accommodated on one side of the drawing body 64 so as to inject air therein. ) And a cable guide body (70) provided for smooth transfer of the cable (22) to the other side corresponding to the injection body (68).

First, the connection cock 72 is coupled to the lower end of the handle body 56 so as to be connected to the supply hose of the air supply pump, and the inlet cock 74 and the supply cock 76 are spaced apart from the connection cock 72. An open / close switch (78) integrally equipped with a handle is bolted on the handle housing (52), and the pull-out trigger (80) for operating the open / close switch (78) is a hinge fitted to the handle housing (52). It is equipped to be operated while rotating around the pin 82.

In addition, at a predetermined position of the handle housing 52, a torque regulator 84 for adjusting torque and a speed controller 88 for adjusting air pressure are provided, respectively, between the inflow cock 74 and the connection cock 72. It is connected to the interconnection hose (90).

In addition, an accommodating part 92 having a predetermined depth is formed inside the support member 54 provided above the handle housing 52, and the bottom handle housing 52 of the accommodating part 92 is mutually provided. First and second accommodation grooves 94 and 96 spaced apart by a predetermined distance are formed, and the first accommodation groove 94 has an impeller at the lower end so as to be rotatable by air pressure supplied internally from the connecting cock 72. The drive shaft 100 which interlocked and provided the 98 is inserted and installed.

On the other hand, the upper surface of the support member 54 is bolted to the seating member 102 provided on the lower portion of the drawing body 64, first, the first and second integrally formed to face both sides of the center of the seating member 102 The protrusions 104 and 106 protrude and are formed, and the first and second protrusions 104 and 106 are provided with the first and second drawing members 60 and 62, respectively.

First, referring to the first drawing member 60, the first bracket 108 having a "c" shape is bolted to the upper surface of the first protrusion 104, the hinge pin (inside) of the first bracket (108) The moving member 114 provided with the roller 112 so as to rotate freely about the 110 is provided in a sliding state.

In addition, an air cylinder 118 having a rod 116 is bolted to an outer surface of the first bracket 108, and the other end of the rod 116 is one surface of the movable member 114 corresponding to the horizontal end thereof. The air cylinder 118 is connected to each other by a supply cock 76 and a connection hose 120 provided in the open / close switch 78.

On the other hand, looking at the second drawing member 62, first "b" shaped second bracket 122 is bolted to the upper surface of the second protruding surface 106, the inside of the second bracket (122) The rotating shaft 126, which interlocks and couples the 124, is installed to penetrate the seating member 102, and the gear unit 128 and the bearing are formed on the rotating shaft 126 that passes through the bottom surface of the seating member 102. 130 are inserted sequentially.

In addition, a drive adapter 134 having a reduction gear 132 is inserted into a bearing (not shown) inserted into one side of the gear unit 128 so as to rotate freely, and the reduction gear 132 is a gear unit ( 128, a bearing 136 is fitted between the reduction gear 132 and the drive adapter 134 for smooth rotation of the drive adapter 134.

Here, the drive adapter 134 is interlocked with and coupled to the drive shaft 100 provided in the first accommodation groove 94 of the handle housing 52, the bearing 130 provided in the gear unit 128 is made of 2 will be accommodated in the receiving groove (96).

In addition, the inlet portion 138 provided on one side of the support member 54 is bolted with both support surfaces 142 of the incision portion 138 while the injection housing 140 of the injection body 68 is fitted. The lower portion of the housing 140 is provided with a push trigger 144 and a connecting cock 146 for supplying air, respectively.

In addition, the upper surface of the injection housing 140 is detachable cover 148 bolted in a state that is divided into each other, the upper surface of the injection housing 140 and the bottom surface of the cover 148, the receiving groove opened to one side by a predetermined length. Each 150 is formed in a corresponding and divided state, and one side of the receiving groove 150 is provided with divided injection nozzles 66, respectively.

In addition, the injection hole 152 is provided on one side receiving groove 150 of the injection housing 140 so that the air supplied from the connecting cock 146 is injected in the direction of the injection nozzle 66, and the accommodation groove 150 of At one side, a receiving groove 154 is formed in the longitudinal direction for aligning the cable 22.

On the other hand, the other side corresponding to the injection body 68 is bolted in a state that the cable guide body 70 for preventing the cable 22 twist and flow during the forward and backward movement of the cable 22 is seated, this cable An accommodating groove 156 is formed in the guide body 70 in a state coinciding with the injection nozzle 66, and a rod pin 158 on the upper portion of the accommodating groove 156 so that the cable 22 is not separated. ) Is embedded.

The present invention configured as described above, first, if you want to test the eddy current using the eddy current inspection air gun 50, first, the injection housing 140 of the air gun 50 as shown in the accompanying drawings, Figure 7 to Figure 7 ), And then the cable 22 of the probe member 12 is received from the spray nozzle 66. The first and second drawing members 60 and 62 of the drawing body 64 are seated. After passing through) and finally settled so as to escape to the receiving groove 156 of the cable guide body 70, the cover 148 is bolted on the upper surface of the injection housing 140.

Then, the injection nozzle 66 is introduced into the inlet 26 of the heat exchanger tube 24 with the probe member 12 inserted therein, and then the push trigger 144 provided in the injection body 68 is removed. In operation, at the same time, the air supplied from the connecting cock 146 on one side is injected into the injection nozzle 66 through the injection hole 152, and the air blown out through the injection nozzle 66 in this way is the probe member ( The rear end of 12) is pushed to move forward.

Then, when the movement of the probe member 12 advancing along the heat exchanger tube 24 is completed as described above, while the cable 22 connected to the probe member 12 is moved backward, it is present in the heat exchanger tube 24. The eddy current is inspected. First, the torque regulator 84 provided in the handle housing 52 and the speed controller 88 for adjusting the air pressure are operated and set to set the air pressure supplied into the handle housing 52. Next, the pull trigger 80 provided in the handle housing 52 is to be operated.

When the pull trigger 80 is operated as described above, a part of the air supplied through the connecting cock 72 of the handle housing 52 is bolted to the handle housing 52 through the connection hose 90. The inflow cock 74 of the closed switch 78 flows in, and the air introduced into the open / close switch 78 is ejected through the supply cock 76 provided on one side.

At this time, the supply cock 76 is connected to the air cylinder 118 and the connection hose 120 of the first drawing member 60 provided in the drawing body 64, and eventually ejected from the supply cock 76 The air to be supplied to the air cylinder 118 through the connection hose 120.

When the air is supplied to the air cylinder 118 as described above, the rod 116 provided in the air cylinder 118 is moved forward. The rod 116 is inside the first bracket 108. Is connected to the moving member 114 is located in the moving member 114 to move forward, if the moving member 114 is moved forward in this way, the roller 112 that is interlocked with the roller 112 which is opposed to this The cable 22 is pushed to the 124 side.

On the other hand, while activating the pull trigger (80) and at the same time a part of the air supplied from the connecting cock 72 is supplied to the first receiving groove (94) through the interior of the handle housing 52, thus receiving the first The drive shaft 100 embedded in the first male groove 94 is rotated by the air injection force supplied to the groove 94.

For reference, the lower end of the drive shaft 100 is provided so that the impeller 98 is interlocked, the drive shaft 100 is rotated in the counterclockwise direction by the injection force of air.

When the drive shaft 100 rotates, a drive adapter 134 having a reduction gear 132 on the bottom surface of the drawing body 64 is interlocked and coupled to the drive shaft 100 so that the drive shaft 100 is The rotational force is transmitted to the drive adapter 134, which causes the drive adapter 134 and the reduction gear 132 to rotate together, and the reduction gear 132 meshes with the gear unit 128 provided at one side thereof. The part 128 is to be rotated.

In addition, when the gear unit 128 rotates as described above, the rotation shaft 126 that cooperates with the gear unit 128 passes through the inside of the second drawing bracket 122, and the rotating shaft passed in this way. The roller 124 is coupled to interlock on the 126, so that the roller 124 is rotated in the clockwise direction.

When the roller 124 rotates, the roller 112 facing the roller 124 is advanced and moved to press the cable 22, and thus the friction force generated between the cable 22 and the rollers 112 and 124. The cable 22 is moved to the rear of the air gun 50, wherein the roller 112 is free to rotate counterclockwise from the moment the cable 22 is moved to the rear.

Then, when the cable 22 is moved to the rear as described above, the probe member 12 inserted into the heat exchanger tube 24 is moved to the rear along the cable 22, at this time, the probe speed moved to the rear The member 12 is moved backwards and forwards in accordance with the rollers 112 and 124 already rotating at a constant rotational speed by air pressure, thereby more accurately performing the eddy current inspection of the heat exchanger tube 24.

For reference, when the moving member 114 is moved forward and moved to the initial state, the connecting hose 120 connected to the air cylinder 118 is separated, and then the moving member 114 is moved backward. When the air present in the interior of the air cylinder 118 escapes to the outside, the reverse movement is possible.

Therefore, in the related art, when inspecting the eddy current, the inspector pulls the cable 22 of the probe member 12 so that the probe member 12 moves backwards and moves at an irregular speed, so that the accurate eddy current inspection cannot be performed. However, in the present invention, the rollers 112 and 124 rotating at a constant speed by the air pressure supplied to the air gun 50 constrain the backward movement speed of the probe member 12, thereby making it possible to examine the eddy current of the heat exchanger tube 24 more. This can be done correctly, thereby increasing the reliability of the test results.

As described above, the present invention is provided with a pull function that operates by air pressure to move the probe member forward and inserted in the heat exchanger tube at a constant speed to make the reverse speed of the probe member constant, thereby performing eddy current inspection more accurately. Thus, the reliability of the test result can be further increased.

Claims (7)

In the air gun for eddy current inspection to move the probe member 12 connected to the cable 22 to examine the eddy current generated in the heat exchanger tube 24, The cable 22 is provided on a handle body 56 having a drive shaft 100 that rotates by air pressure inside the handle housing 52 and a central upper surface of the seating member 102 that is seated on the handle body 56. Injecting nozzle 64 is provided with a drawing body 64 having the first and second drawing members 60 and 62 and a cable 22 at one side of the drawing body 64 so as to eject the air. Eddy current inspection, characterized in that it comprises a jet body 68 provided with a 66 and a cable guide body 70 provided for smooth transfer of the cable 22 to the other side corresponding to the jet body 68. Air gun. The method of claim 1, An air gun for eddy current inspection, characterized in that the impeller 98 is provided at the lower end of the drive shaft 100 to interlock. The method of claim 1, In the first drawing member 60, a first bracket 108 having an air cylinder 118 installed on one surface thereof is bolted to an upper surface of the seating member 102, and an inside of the first bracket 108 has an air cylinder ( 118 is provided with a moving member 114 to move horizontally, the eddy current, characterized in that the roller 112 is freely rotated around the hinge pin 110 is installed inside the moving member (114) Inspection air gun. The method of claim 1, The second drawing member 62 has a second bracket 122 is bolted to the upper surface of the seating member 102, the inside of the second bracket 122, the rotating shaft 126 is interlocked with the roller 124. Air gun for eddy current inspection, characterized in that installed so as to penetrate the bottom surface of the seating member (102). The method according to claim 1 or 4, The gear part 128 and the bearing 130 are sequentially inserted on the rotating shaft 126 which penetrates the seating member 102, and one side of the gear part 128 is interlocked with the reduction gear 132 engaged with the gear part 128. Air gun for eddy current inspection, characterized in that the drive adapter 134 is provided. The method of claim 1, The injection body 68 is composed of a cover 148 that is divided from the injection housing 140, the receiving groove 150 is provided with an injection nozzle 66 on one side of the upper surface of the injection housing 140 is formed An air gun for eddy current inspection, characterized in that the connecting groove 146 and the push trigger 144 for supplying air are provided on the bottom surface corresponding to the receiving groove 150. The method of claim 1, An accommodating part 156 is formed in the cable guide body 70 to accommodate the cable 22, and a rod pin 158 is formed on the upper part of the accommodating part 156 so that the cable 22 is not separated. Air gun for eddy current inspection, characterized in that studded.