JP2003013070A - Device for inspecting coke drum - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for inspecting a coke drum, capable of accurately detecting the deformation of the inner wall of the coke drum, having reproducibility of the inspection result, capable of carrying out the inspection operation with a few man-hour, and capable of facilitating the after treatment of the inspection result. SOLUTION: This device for inspecting the coke drum is the inspection device for inspecting the coke drum CD for producing cokes, and comprises an upper stand 10 and a lower stand 20 attached to the upper end and the lower end of the coke drum CD respectively, a plurality of guide cables installed between the stands 10 and 20 so as to be parallel to the center axis of the coke drum CD, a measuring part 50 installed along the plurality of guide cables 30 so as to be freely lifted and lowered, and for inspecting the inner wall of the coke drum CD, and a lifting and lowering means 40 for lifting and lowering the measuring part 50. The measuring part 50 is supported by the plurality of guide cables 30 so that the center axis thereof may coincide with the center axis of the coke drum CD.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a coke drum inspection device. After heating the heavy oil remaining after the crude oil is fractionated, it is pyrolyzed in a high temperature coke drum to produce coke. This coke drum has an operating temperature (4
40-500 ℃), operating pressure (1-7Kg / cm2G), coke removal temperature (normal temperature), pressure (atmospheric pressure) 16-2
Since it is repeated every 4 hours, repeated stress due to thermal stress, operating pressure, and coke head pressure is applied to the body.
Further, the coke drum is rapidly cooled from the operating temperature to room temperature by injecting cooling water, but as the cooling of the coke drum progresses, a "bulging phenomenon" occurs in which it partially contracts, The tensile stress generated at this time causes cracks on the clad surface and the overlay heat affected zone. Further, when the cooling water is injected, the cooling water may flow into the coke drum so that the inner surface of the coke drum is not cooled uniformly, and the coke drum may be temporarily curved. The present invention relates to a coke drum inspection device for inspecting a coke drum for deformation and damage caused by the above-described repeated stress, “bulging phenomenon”, and “banana phenomenon”.

[0002]

2. Description of the Related Art FIG. 8 shows a conventional coke drum inspection device 100.
FIG. 7 is an explanatory diagram of a usage state of the. In the figure, reference numeral CD indicates a coke drum, reference numeral TM and reference numeral BM.
Shows a top manhole and a bottom manhole provided at the upper and lower ends of the coke drum CD.
This top manhole TM and bottom manhole BM
Is provided with an insertion hole Th and a discharge hole Bh, respectively, and their centers are provided on the central axis of the coke drum CD. Discharge hole B of this bottom manhole BM
h is a coke drum CD of heavy oil remaining after fractionating crude oil.
It is for supplying to the inside and discharging the coke generated after the thermal decomposition. On the other hand, the insertion hole Th of the top manhole TM is for inserting a drill stem DS for cutting coke into the coke drum CD. The drill stem DS is rotatable about its central axis, and a member called a cutting head for cutting out coke is usually attached to the lower end of the drill stem DS.

Now, a conventional coke drum inspection device 100 will be described. When inspecting the inside of the coke drum CD, as shown in FIG. 8, a measuring unit 101 of the coke drum inspection device 100 is attached to the lower end of the drill stem DS instead of the cutting head. This measuring unit 101
Is a laser sensor 102 for measuring the distance from the measuring unit 101 to the inner wall of the coke drum CD, and the coke drum C.
A video camera 103 for observing the appearance of the inner wall of D is provided. The measurement unit 101 is also connected to the control unit 105 by an inspection cable 106.

Therefore, when the drill stem DS is inserted into the coke drum CD through the insertion hole Th of the top manhole TM and the drill stem DS is rotated while being vertically moved, the measuring unit 101 is also vertically moved. While rotating while the laser sensor 102 of the measuring unit 101
The distance from 1 to the inner wall of the coke drum CD can be measured over the inner wall of the coke drum CD, and the appearance can be photographed by the video camera 103 over the inner wall of the coke drum CD. And the measurement section
The data measured and photographed by the laser sensor 102 and the video camera 103 of 101 is recorded in the control unit 105 through the inspection cable 106. Therefore, by analyzing the data recorded in the control unit 105, the deformation of the coke drum CD and the ,
The degree of damage to the inner wall can be grasped.

[0005]

However, the drill stem DS is provided such that its central axis is parallel to the central axis of the coke drum CD and near the central axis of the coke drum CD. Since the position accuracy of the tip end portion on which the measuring unit 101 is mounted is very low, when the measuring unit 101 is moved up and down by the drill stem DS,
The center axis of the disc shifts from the center axis of the coke drum CD. Therefore, by the laser sensor 102 of the measuring unit 101 at the same angle with respect to the central axis of the coke drum CD,
There is a problem that the vertical deformation of the inner wall of the coke drum CD cannot be accurately inspected. However, if the deviation of the central axis of the drill stem DS from the central axis of the coke drum CD is found along the central axis of the coke drum CD and the measurement result by the laser sensor 102 of the measuring unit 101 is corrected, the coke drum CD It is possible to accurately inspect the vertical deformation of the inner wall, but since it is necessary to obtain the deviation for each coke drum CD, it is necessary to perform measurement for correcting the deviation at each site before measurement. There is a problem that the number of man-hours of work increases and post-processing of the inspection result becomes complicated. Further, the rotation and lifting of the measuring unit 101 are performed by a drill stem rotating device that rotates the drill stem DS and a drill stem lifting winch that lifts the drill stem DS. Therefore, the coke drum CD
The angle at which the measurement unit 101 starts the inspection with respect to the center axis of the, and the position at which the measurement unit 101 starts the inspection in the vertical direction of the center axis of the coke drum CD cannot be accurately grasped. Therefore, since the angle at which the measurement unit 101 starts the inspection and the position in the vertical direction vary from inspection to inspection, there is no reproducibility in the inspection results, and the reliability is low even when comparing the inspection results in each inspection. There is a problem. Furthermore, since the drill stem raising / lowering winch does not essentially require highly accurate vertical movement, even if the inspection start position of the measuring unit 101 in the vertical direction of the center axis of the coke drum CD can be grasped, it always moves up / down by a fixed amount. However, there is a problem that the reproducibility of the inspection result is low.

In view of the above situation, the present invention can accurately grasp the deformation of the inner wall of the coke drum, has the reproducibility of the inspection result, reduces the man-hours of the inspection work, and facilitates the post-processing of the inspection result. An object is to provide a drum inspection device.

[0007]

A coke drum inspection device according to claim 1 is an inspection device for inspecting a coke drum for producing coke, the inspection device being an upper part attached to an upper end of the coke drum. A frame, a lower frame attached to the lower end of the coke drum, and a plurality of guide cables provided inside the coke drum between the lower frame and the upper frame in parallel to the central axis of the coke drum. And a measurement unit for inspecting the inner wall of the coke drum, which is provided so as to be vertically movable along the plurality of guide cables, and an elevating means for elevating and lowering the measurement unit. An upper template that supports the upper ends of the plurality of guide cables in a rotationally symmetric position with respect to the central axis of the coke drum is provided, and the lower mount is The lower end portion of the plurality of guide cables is provided with a lower template that supports a rotationally symmetrical position with respect to the center axis of the coke drum, and the measurement unit includes the plurality of guide cables, the center axis of which is the It is characterized in that it is supported so as to coincide with the central axis of the coke drum. The coke drum inspection device according to claim 2,
The invention according to claim 1, wherein a top manhole having an insertion hole having a center on a central axis of the coke drum is provided at an upper end of the coke drum, and the insertion hole is provided on an outer periphery of the top manhole. A plurality of through holes are formed at positions rotationally symmetric with respect to the center of the top pedestal, and the outer circumference of the upper mount is rotationally symmetric with respect to its center axis and the distance from the center axis is such that the top manhole is inserted. At the same distance as the distance from the center of the hole to the through hole, a plurality of fixing holes are formed, the upper template, the central axis of which coincides with the central axis of the upper mount, Attached to the upper mount,
At the lower end of the coke drum, a bottom manhole having a discharge hole centered on the central axis of the coke drum is provided, and at the outer periphery of the bottom manhole,
A plurality of through holes are formed at a position that is rotationally symmetrical with respect to the center of the discharge hole and has a distance from the center axis thereof equal to the distance from the center of the discharge hole of the bottom manhole to the through hole. In addition, a plurality of fixing holes are formed on the outer periphery of the lower pedestal at positions that are rotationally symmetric with respect to the central axis of the lower pedestal, and the central axis of the lower template matches the central axis of the lower pedestal. As described above, the fixing holes of the upper template are attached to the plurality of through holes of the top manhole so that the fixing holes of the lower template are fixed to the plurality of through holes of the bottom manhole. The feature is that the holes are attached together. A coke drum inspection apparatus according to a third aspect is the coke drum inspection apparatus according to the first or second aspect, wherein the elevating means is a stepping motor provided on the upper mount, a drum attached to a main shaft of the stepping motor, and one end portion. Is wound around the outer periphery of the drum, and the other end is made up of an elevating cable attached to the measuring section, and the stepping motor is provided with rotation amount indicating means for indicating the rotation amount of the main shaft with respect to the reference position. Is characterized by. The coke drum inspection device according to claim 4 is the coke drum inspection device according to claims 1 and 2.
Alternatively, in the invention described in 3, the measuring unit includes a main body supported by the guide cable, a rotating unit provided around the main body and rotatably attached to an outer periphery of the main body. It is characterized by comprising a rotating means for rotating the rotating portion and a measuring means attached to the rotating portion, rotating with the rotating portion for inspecting an inner wall of the coke drum. According to a fifth aspect of the present invention, in the coke drum inspection apparatus according to the first, second, third, or fourth invention, the measuring unit includes a plurality of laser sensors for measuring a distance to the inner wall of the coke drum. A plurality of laser sensors, along the central axis of the coke drum,
When the measuring means includes only one laser sensor, the stepping motor has a plurality of laser sensors that are arranged in multiple stages and are arranged at intervals between the plurality of laser sensors in the direction along the center axis of the coke drum. It is characterized in that it has the same length as an elevating step for elevating and lowering the measuring means. According to a fifth aspect of the present invention, in the coke drum inspection apparatus according to the first, second, third, fourth, or fifth aspect, the measuring unit includes an inner wall photographing video camera for photographing the inner wall of the coke drum. The control unit is provided with a position display monitor for displaying the position of the measuring unit in the coke drum, and the control unit shooting video camera for shooting the position display monitor of the control unit. The image of the video camera for photographing the inner wall and the image of the video camera for photographing the control unit are simultaneously recorded and displayed on the same screen of the video monitor.

According to the first aspect of the present invention, the elevating means can inspect the inner wall of the coke drum from the upper end to the lower end by raising and lowering the measuring section along the plurality of guide cables. Moreover, the measuring section is supported by the plurality of guide cables so that the central axis of the measuring section is located at the central axis of the coke drum. Therefore, it is possible to prevent the measuring section from tilting when moving up and down. The central axis can always be aligned with the central axis of the coke drum. Therefore, the vertical deformation of the coke drum inner wall can be accurately inspected. Further, since the central axis of the measuring unit always coincides with the central axis of the coke drum, it is not necessary to perform the correction measurement for correcting the deviation of the central axis of the measuring unit from the central axis of the coke drum. Since the number of working steps can be reduced and it is not necessary to correct the inspection result, the post-processing of the measurement result is simple. According to the invention of claim 2, if the fixing holes of the upper mount and the lower mount and the through holes of each manhole are fixed together, the central axis of each template is the central axis of each manhole, that is, the center of the coke drum. Can be aligned with the axis. For this reason, if a member supporting the guide cable is provided at a position rotationally symmetrical with respect to the center axis of each template, a plurality of guide cables can be attached to the center axis of the coke drum simply by mounting the upper mount and the lower mount. Therefore, it can be easily arranged in a rotationally symmetrical position. According to the invention of claim 3, when the stepping motor is driven, the lifting cable is wound up,
Since it can be extended, the measurement unit can be moved up and down. Moreover, since the amount of elevation of the measuring unit is determined by the amount of rotation of the stepping motor, the measuring unit can be accurately elevated and lowered by a fixed amount. Therefore, the vertical deformation of the inner wall of the coke drum can be accurately inspected by the measuring unit. Further, by recording the instruction value of the rotation amount instructing means at the start of the inspection, the inspection can be always started from a fixed position in the vertical direction of the center axis of the coke drum, so that the reproducibility of the inspection result can be improved. it can. According to the invention of claim 4, the inner peripheral surface of the coke drum can be measured by the measuring means by rotating the rotating portion by the rotating means. Moreover, the main body supported by the guide cable does not rotate, and its central axis is always supported in a state where it coincides with the central axis of the coke drum. It is placed in a position with. Therefore, even if the measuring unit moves up and down, the measuring means is always at a constant distance from the center axis of the coke drum, so that the vertical deformation of the inner wall of the coke drum can be accurately inspected. According to the invention of claim 5, the step of moving the measuring unit up and down can be increased with the measurement interval of the laser sensor in the direction of the central axis of the coke drum being kept constant. Thus, the inspection time can be shortened without lowering the measurement accuracy. According to the invention of claim 6, an image showing the position (height in the coke drum and the angle with respect to the central axis) of the measuring section displayed on the position control monitor of the control means is taken as a video camera for photographing the control section. By recording with the image of the inner wall of the coke drum shot by the video camera for shooting the inner wall, it is possible to display the image of the inner wall of the coke drum and its shooting position on the same image on the video monitor. It is possible to identify the abnormal part in the coke drum.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to the drawings. First, before describing the coke drum inspection device 1 of the present embodiment, the coke drum CD inspected by the coke drum inspection device 1 will be described.
FIG. 1 is an explanatory diagram of a usage state of the coke drum inspection device 1 of the present embodiment. FIG. 2 is a schematic plan view of the upper mount 10. FIG. 4 is a schematic bottom view of the lower mount 20. In FIGS. 1, 2 and 4, reference numeral CD indicates a coke drum body. Reference characters TM and BM indicate a top manhole and a bottom manhole provided at the upper end and the lower end of the coke drum CD. The top manhole TM has an insertion hole Th centered on the central axis of the coke drum CD. This insertion hole Th
Is provided for inserting a drill stem for cutting coke. In addition, a plurality of through holes TC are formed on the outer periphery of the top manhole TM at positions rotationally symmetrical with respect to the center of the insertion hole Th in order to attach a lid that hermetically seals the insertion hole Th of the top manhole TM. ing. The bottom manhole BM has a discharge hole Bh centered on the center axis of the coke drum CD. The discharge hole Bh is provided to supply heavy oil into the coke drum CD and to discharge the generated coke after thermal decomposition. In addition, a plurality of through holes Bc are formed on the outer periphery of the bottom manhole BM in positions rotationally symmetrical with respect to the center of the discharge hole Bh in order to attach a lid that hermetically seals the discharge hole Bh of the bottom manhole BM. ing.

Now, the coke drum inspection device 1 of this embodiment will be described. As shown in FIG. 1, the coke drum inspection device 1 of the present embodiment is an inspection device for inspecting the inside of a coke drum CD for producing petroleum coke or coal coke having the above structure, Upper frame 10, lower frame 20, multiple guide cables 3
0, an elevating means 40, and a measuring unit 50.

First, the upper mount 10 will be described. As shown in FIGS. 1 and 2, an upper frame 11 of an upper frame 10 is attached to the top manhole TM of the coke drum CD. This upper frame 11 is
A plurality of fixing holes in the mounting portion on the top manhole TM
11h is formed. The plurality of fixing holes 11h are rotationally symmetrical with respect to the central axis of the upper frame 11, and the distance from the central axis of the upper frame 11 is the top manhole T.
It is formed at a position having the same length as the distance from the center of the insertion hole Th of M to the through hole Tc.

An upper template 15 is attached to the lower end of the upper frame 11 such that the central axis thereof coincides with the central axis of the upper frame 11. Four guide cable positioning members 16 are attached to the upper template 15 at positions that are rotationally symmetrical with respect to the central axis thereof. Each guide cable positioning member 16 is for supporting an upper end portion of a guide cable 30 described later, and is composed of a pair of fixing plates 16a and 16b. Notches 16h are formed on the outer circumferences of the pair of fixing plates 16a and 16b, respectively. When the pair of fixing plates 16a and 16b are aligned so that the notches 16h face each other, a guide cable 30 described later is formed. A guide cable support hole 16c through which the guide cable is passed is formed. Of the pair of fixed plates 16a and 16b, the fixed plate 16a
The notch 16h is fixed to the upper template 15 so that the notch 16h is located above the notch 15h formed in the upper template 15, and the fixing plate 16b is detachable from the upper template 15.

Therefore, the fixing hole 11h of the upper mount 10 is formed.
Is fixed to the insertion hole Th of the top manhole TM, the central axis of the upper template 15 can be aligned with the central axis of the top manhole TM, that is, the central axis of the coke drum CD. Moreover, since the four guide cable positioning members 16 that support the guide cables 30 are provided at positions that are rotationally symmetric with respect to the central axis of the upper template 15, simply by attaching the upper mount 10 to the top manhole TM, a plurality of guide cables can be provided. The guide cable 30 can be easily arranged at a position rotationally symmetrical with respect to the central axis of the coke drum CD.

Further, as shown in FIG. 3, the lower end of the column 12a of the frame 12 provided so as to straddle the upper template 15 is attached to the top manhole TM of the coke drum CD. Four chain blocks 14 are attached to the beam 12b of the frame 12. A guide cable 30 described below is attached to each chain block 14.

Next, the lower mount 20 will be described.
As shown in FIGS. 1 and 4, a lower frame 21 of a lower frame 20 is attached to the bottom manhole BM of the coke drum CD. This lower frame 21
Has a plurality of fixing holes 21h formed in its attachment portion to the bottom manhole BM. This plurality of fixing holes 21h
Is rotationally symmetric with respect to the central axis of the lower frame 21, and
It is formed at a position where the distance from the central axis of the lower frame 21 is the same as the distance from the center of the discharge hole Bh of the bottom manhole BM to the through hole Bc.

A lower template 25 is attached to the upper end of the lower frame 21 so that the central axis thereof coincides with the central axis of the lower frame 21. Four guide cable positioning members 26 are attached to the lower template 25 at positions that are rotationally symmetrical with respect to the central axis thereof and vertically below the four guide cable positioning members 16 of the upper template 15. There is.
Each guide cable positioning member 26 is for supporting a lower end portion of a guide cable 30 described later, and is composed of a pair of fixing plates 26a and 26b. A notch 26h is formed in each of the pair of fixing plates 26a, 26b, and the pair of fixing plates 26a, 2b are arranged so that the notches 26h face each other.
When 6b are put together, a guide cable support hole 26c through which a guide cable 30 described later is inserted is formed. One of the pair of fixing plates 26a and 26b is fixed to the lower template 25 so that the notch 26h is located below the notch 25h formed in the lower template 25, and the other is attached to and detached from the lower template 25. You are free.

Therefore, the fixing hole 21h of the lower mount 20 is
Is fixed to the discharge hole Bh of the bottom manhole BM, the central axis of the lower template 25 can be aligned with the central axis of the bottom manhole BM, that is, the central axis of the coke drum CD. Moreover, since the four guide cable positioning members 26 that support the guide cable 30 are provided at positions that are rotationally symmetric with respect to the central axis of the lower template 25, the lower mount 20 is fixed to the bottom manhole BM.
It is possible to easily dispose the plurality of guide cables 30 at positions rotationally symmetric with respect to the central axis of the coke drum CD by simply attaching the guide cables 30 to.

Next, the guide cable 30 will be described. As shown in FIGS. 1 and 3, four guide cables 30 are provided between the upper template 15 of the upper pedestal 10 and the lower template 25 of the lower pedestal 20. The upper end of each guide cable 30 is the upper mount 1
0 is connected to four chain blocks 14 provided on the frame 12, and the upper end thereof is introduced into the coke drum CD through the guide cable support hole 16h of the upper template 15. On the other hand, the lower ends of the guide cables 30 pass through the guide cable support holes 26h of the lower template 25 located vertically below the guide cable positioning member 16 of the upper template 15 through which the guide cables 30 pass. , Lower template 2
5, the lower end of which hangs downward from the lower mount 20.
It is fixed by being wound around the cable winding shaft 35 provided in the.

Therefore, if the four guide cables 30 are pulled up by the four chain blocks 14, the four guide cables 30 are guided between the upper template 15 of the upper mount 10 and the lower template 25 of the lower mount 20. The cable 30 can be stretched parallel to the central axis of the coke drum CD. Moreover, each of the four guide cables 30
Has its upper end supported by the guide cable positioning member 16 of the upper template 15 in a rotationally symmetrical position with respect to the center axis of the coke drum CD, and its lower end by the guide cable positioning member 26 of the lower template 25. Since the four guide cables 30 are supported in a rotationally symmetrical position with respect to the central axis of the drum CD, the four guide cables 30 are stretched in a rotationally symmetrical position with respect to the central axis of the coke drum CD.

The number of guide cables 30 is not limited to four, and may be three or five or more. In this case, the guide cable positioning members 16 and 26 and the chain block 14 provided on the upper and lower templates 15 and 25, respectively.
The same number as the number of the guide cables 30 may be provided, and all the guide cable positioning members 16 and 26 may be provided at positions rotationally symmetrical with respect to the central axes of the upper and lower templates 15 and 25.

Further, as the structure of the cable winding shaft 35, any structure such as a hook system or a drum system may be used as long as it can fix the guide cable 30.

Inside the coke drum CD, the measuring section 5 is moved up and down by being guided by the four guide cables 30.
0 is provided, but before explaining the measuring unit 50, the elevating means 40 for vertically moving the measuring unit 50 will be described.

As shown in FIGS. 1 and 2, the stepping motor 41 of the elevating means 40 is attached to the upper surface of the upper frame 11 of the upper frame 10. The stepping motor 41 can rotate in the forward and reverse directions, and the spindle can be intermittently operated at a constant rotation angle. The stepping motor 41 is provided with a rotation amount instruction means (not shown) that indicates the rotation amount of the main shaft with respect to the reference position. This rotation amount instruction means, for example, when the main shaft of the stepping motor 41 is stopped, if its support value is set to 0, the value of the angle obtained by integrating the rotation angle of the main shaft from that state, that is, if the main shaft is rotated two times. 720 degrees,
If it is rotated three times, it can be shown as 1080 degrees.

The main shaft of the stepping motor 41 is
A drum 42 is attached. A lifting cable 43 is wound around the outer circumference of the drum 42. The elevating cable 43 is also wound around the pulley 44 and the pulley 45, and the other end is introduced into the coke drum CD and attached to the connecting shaft 53b of the measuring unit 50 described later.

For this reason, by driving the stepping motor 41, the elevating cable 43 can be wound or unwound, so that the measuring section 50 can be moved up and down. Moreover, since the amount of elevation of the measuring unit 50 is determined by the amount of rotation of the main shaft of the stepping motor 41, the measuring unit 50 can be accurately elevated and lowered by a fixed amount. Further, if the instruction value of the rotation amount instruction means at the start of the inspection is recorded, the inspection can be always started from a fixed position in the vertical direction of the central axis of the coke drum CD, so that the reproducibility of the inspection result is improved. You can

Now, the measuring section 50 will be described. Figure 5
FIG. 3 is a schematic vertical sectional view of the measuring unit 50. FIG. 6 shows the measuring unit 50.
2 is a schematic plan view of FIG. 5 and 6, reference numeral 51
Indicates a body portion, and reference numerals 52a and 52b indicate a pair of upper and lower frames of the body portion 51. This pair of upper and lower frames
52a and 52b have circular outer peripheries in a plan view and are arranged in parallel with each other. Also, reference numerals 53a and 53b
Shows a plurality of connecting frames and a connecting shaft for connecting the pair of upper and lower frames 52a, 52b. This connecting shaft 53b
Penetrates through the centers of the pair of upper and lower frames 52a, 52b, and the lifting cable 43 of the lifting means 40 is attached on the center axis of the pair of upper and lower frames 52a, 52b at the upper end thereof.

On the upper frame 52a, the main body 51
Four upper guide cable holding portions 54a are provided at positions that are rotationally symmetrical with respect to the central axis of the. The upper guide cable holding portion 54a includes a pair of guide rolls 54 having grooves formed on the outer circumference.
It has r and 54r. The pair of guide rolls 54r, 54r are
The outer circumferences of the guide cables 30 are attached to each other, and the guide cable 30 is sandwiched between the outer circumferences. further,
On the lower frame 52b, there are four lower guide cable holding portions 54b which are rotationally symmetrical with respect to the central axis of the main body 51 and vertically below the four upper guide cable holding portions 54a.
Is provided. The lower guide cable holding portion 54b has the same configuration as the upper guide cable holding portion 54a, and the pair of guide rolls 54r, 54r are attached so that their outer peripheries face each other, and the guide cable 30 is provided between the outer peripheries thereof.
Sandwiched between.

For this reason, the main body portion 51 is provided with four upper guide cable holding portions 54a and four lower guide cable holding portions 54b which are provided in rotationally symmetrical positions with respect to the central axis of the coke drum CD. Since it is supported by four guide cables 30 provided in parallel with each other, the center axis of the main body 51 can be aligned with the center of the four guide cables 30, that is, the center axis of the CD of the coke drum. it can. Moreover, one guide cable 30 is held by the pair of upper and lower guide cable holding portions 54a and 54b at the two upper and lower positions. Therefore, even when the main body 51 is moved up and down by the elevating means 30, the main body 51 can be moved up and down with its central axis aligned with the central axis of the coke drum CD.

A donut-shaped rotating portion 55 is attached around the upper frame 52a of the main body portion 51. At the upper part of the inner circumference of the rotating part 55, the main body 51
A plurality of rolling portions 56 are provided at positions that are rotationally symmetric with respect to the central axis of the. The plurality of rolling portions 56 are provided with a pair of upper and lower rollers 56r, 56r so as to sandwich the outer peripheral edge of the upper frame 52a from above and below, and are provided between the inner surface of the rotating portion 55 and the outer periphery of the upper frame 52a. And a roller 56d that is mounted. The pair of upper and lower rollers 56r, 56r is an upper frame.
The outer peripheral edge of 52a can be rolled. Also, rollers 56d, 5
6d can roll on the outer peripheral surface of the upper frame 52a. Therefore, the rotating portion 55 can rotate around the central axis of the main body portion 51 along the outer periphery of the upper frame 52a of the main body portion 51 in a state where the rotational axes match. In this embodiment, the main body 51 and the rotating portion 55 are rotatably supported by the rollers 56r and 56d, but they may be rotatably supported by bearings.

Inner teeth 61 whose center of the basic circle is concentric with the central axis of the main body 51 are formed along the inner periphery of the lower portion of the inner periphery of the rotating portion 55. A drive gear 62 meshes with the inner teeth 61.
Is attached to the main shaft of a drive motor 63 attached to the connecting frame 53a of the main body 51. Also,
A plurality of idler gears 64 are provided at positions rotationally symmetrical to the drive gear 62 with respect to the central axis of the main body 51, and mesh with the internal teeth 61. Therefore, when the drive motor 63 is driven, the internal gear 6 is driven through the drive gear 62.
Since the rotational torque is transmitted to 1, the rotating portion 55 can rotate around the central axis of the main body portion 51. Moreover, since the plurality of idler gears 64 are provided at positions rotationally symmetric with respect to the drive gear 62, the rotating portion 55 of the main body portion 51 has its rotation axis aligned with the central axis of the main body portion 51. It can rotate about its central axis. The internal teeth 61, the drive gear 62, the drive motor 63, and the plurality of idler gears 64 described above are the rotating means in the claims.

Next, the measuring means 70 will be described. A video camera 71 is provided on the upper surface of the rotating unit 55. The video camera 71 is for photographing the inner surface of the coke drum CD. Reference numeral 71a indicates a light for illuminating the imaging position of the video camera 71. A laser sensor 72 is also provided on the upper surface of the rotating portion 55. The laser sensor 72 is a laser sensor 72.
To measure the distance from to the inner surface of the coke drum CD.

Since the structure is as described above, the measuring unit 50
According to the above, when the drive motor 63 is driven, the rotation unit 55
Moves around the outer periphery of the main body 51, so that the inner wall of the coke drum CD can be measured at all angles by the measuring means 70 provided in the rotating portion 55. Moreover, the main body portion 51 supported by the four guide cables 30 is supported with the central axis thereof always aligned with the central axis of the coke drum CD even when the main body portion 51 is moved up and down. Is always arranged at a position with a constant distance from the central axis of the coke drum CD. Therefore, even if the measuring unit 50 moves up and down, the laser sensor 72 is always at a constant distance from the center axis of the coke drum, so that the coke drum CD
The distance between the inner wall of the and the central axis of the coke drum CD can be accurately grasped. Therefore, the coke drum C
The vertical deformation of the inner wall of D can be accurately inspected. Further, since the central axis of the measuring unit 50 always coincides with the central axis of the coke drum CD, correction measurement for correcting the deviation of the central axis of the measuring unit 50 from the central axis of the coke drum CD is performed. Since it is not necessary, the number of working steps can be reduced, and it is not necessary to correct the inspection result, so that the post-processing of the measurement result is simple.

As shown in FIG. 7, the laser sensor 7
Two 2 may be provided at intervals in the vertical direction. If the step of raising and lowering the measuring unit in the case of one laser sensor 72 is, for example, 25 mm, the distance between the two laser sensors 72 in the direction of the central axis of the coke drum CD is 2
If the distance is set to 5 mm, the measurement interval of the laser sensor 72 in the vertical direction can be maintained at 25 mm even when the step of raising and lowering the measuring unit is 50 mm. Therefore, with the measurement interval of the laser sensor 72 kept constant, the measurement unit 5
Since the step of raising and lowering 0 can be increased, the inspection time can be shortened as compared with the case where there is one laser sensor 72 without lowering the measurement accuracy. Furthermore, the number of laser sensors 72 provided is not limited to two, and three or more laser sensors 72 may be provided if the distance between adjacent laser sensors 72 in the vertical direction of the central axis of the coke drum CD is constant. Good.

Next, the operation and effect of the coke drum inspection device 1 of this embodiment will be described. First, a method of installing the coke drum inspection device 1 on the coke drum CD will be described.

First, the upper frame 11 of the upper mount 10 is inserted into the through hole TC of the top manhole TM of the coke drum CD.
Align the fixing holes 11h of and attach with bolts. Then, the central axis of the upper template 15 coincides with the central axis of the insertion hole Th of the top manhole TM, that is, the central axis of the coke drum CD.

When the coke drum CD to be inspected is the one to be inspected for the first time, the through hole TC of the top manhole TM to which the fixing hole 11h of the upper frame 11 is fixed is recorded. Then, at the next inspection, the fixing hole 11h of the upper frame 11 can be fixed to the through hole TC of the top manhole TM which is the same as this time. Therefore, the measuring means 70 is attached to the center axis of the coke drum CD.
The angles at which the inspection starts can be the same, and the reproducibility of the inspection result can be improved. Furthermore, if the coke drum CD to be inspected is one that has been inspected before, the fixing hole 11h of the upper frame 11
The same as the previous inspection, the through hole T of the top manhole TM
Fix at C. Then, the angle at which the measuring means 70 starts the inspection with respect to the central axis of the coke drum CD can be made the same as that at the time of the previous inspection, and the comparison with the previous inspection result becomes possible. The reproducibility of the inspection result can be improved.

Next, the raising / lowering cable 43 is fed from the stepping motor 41 of the raising / lowering means 30 and hung down through the inside of the coke drum CD and below the bottom manhole BM of the coke drum CD. Then, the lower end of the elevating cable 43 hanging from the bottom manhole BM is attached to the main body 51 of the measuring unit 50, and the elevating cable 43 is slightly wound up by the stepping motor 41.
The measuring unit 50 is suspended in the coke drum CD. At this time, the control means 75 for controlling the measuring means 70 of the measuring section 50 and the recording means 76 for recording the data from the measuring means 70.
A transmission cable 74 for transferring to the inside of the coke drum CD is hung from the insertion hole Th of the top manhole TM and connected to the measuring unit 50.

Next, the upper ends of the four guide cables 30 are attached to the four chain blocks 14 of the upper frame 20, respectively. And, four guide cables 30,
It is hung inside the coke drum CD through the notch 16h formed in the fixing plate 16a of the one guide cable positioning member 16 attached to the upper template 15 and the notch 15h formed in the upper template 15. At this time, the other fixing plate 16b of each guide cable positioning member 16 is removed from the upper template 15. Each guide cable 30 hung inside the coke drum CD is hung below the bottom manhole BM of the coke drum CD through a pair of upper and lower guide cable holding portions 54a, 54b provided in the main body 51 of the measuring unit 50. .

Next, the lower frame 2 of the lower mount 20 is inserted into the through hole BC of the bottom manhole BM of the coke drum CD.
Align the fixing holes 21h of 1 and attach with bolts. Then, the central axis of the lower template 25 coincides with the central axis of the insertion hole Bh of the bottom manhole BM, that is, the central axis of the coke drum CD. At this time, the four guide cable positioning members 26 provided on the lower template 25 are positioned vertically below the four guide cable positioning members 16 of the upper template 15.

Next, the four guide cables 30 are attached to the lower template 25 by one notch 26h of the fixing plate 26a of the guide cable positioning member 26, and
It hangs downward from the lower template 25 through the notch 25h formed in the lower template 25. At this time, the other fixing plate 26 of each guide cable positioning member 26
Remove b from the lower template 25.

Then, the lower end of each guide cable 30 is fixed to the guide cable winding shaft 35. Next, one fixing plate 16a, 2
The other fixing plate 16 is formed so that the notches 16h and 26h of 6a face the notches 16h and 26h of the other fixing plates 16b and 26b, respectively.
When b and 26b are attached to the upper and lower templates 15 and 25, the upper and lower ends of the guide cable 30 are positioned by the guide cable positioning members 16 and 26.

When the upper ends of the four guide cables 30 are pulled up by the four chain blocks, the four guide cables 30 are connected to the center axis of the coke drum CD between the upper mount 10 and the lower mount 20. They are arranged in parallel and rotationally symmetrical with respect to the central axis of the coke drum CD.

Next, the work of inspecting the inner wall of the coke drum CD by the coke drum inspection device 1 of this embodiment will be described. First, the stepping motor 41 of the lifting means 30
The measurement unit 50 is moved up to move to the measurement start position and is stopped at that position.

When the coke drum CD to be inspected is the one to be inspected for the first time, the supporting value of the rotation amount supporting means provided in the stepping motor 41 is recorded. Then, in the next inspection, if the stepping motor 41 is operated so that the support value of the rotation amount support means at the start of the inspection becomes the same as the support value at the start of the present inspection, the center of the coke drum CD Since the inspection can be started from the same position in the vertical direction of the axis, the reproducibility of the inspection result can be improved. Furthermore, when the coke drum CD to be inspected is one that has been inspected before, the support value of the rotation amount supporting means is the same as the support value of the rotation amount supporting means at the start of the previous inspection. The stepping motor 41 is operated so that the value becomes a value. Then, in the vertical direction of the central axis of the coke drum CD, the inspection can be started from the same position as the previous time, so that the inspection results can be compared and the reproducibility of the inspection results can be improved.

Then, when the drive motor 63 of the measuring section 50 is actuated, the rotating section 55 rotates around the central axis of the main body section 51, so that the measuring means 7 attached to the rotating section 55.
With 0, the inner wall of the coke drum CD at the height where the measuring unit 50 is located can be inspected over the entire circumference. At this time, the main body 51 does not rotate itself, and the central axis of the main body 51 is always aligned with the central axis of the coke drum CD.
It is attached to the four guide cables 30 by 54a and 54b. Therefore, when the rotating portion 55 rotates,
Even if the laser sensor 72 of the measuring means 70 is positioned at any angle with respect to the central axis of the coke drum CD, the laser sensor 7
2 is always arranged at a position having a constant distance from the central axis of the coke drum CD. Therefore, the laser sensor 72
Thus, the distance from the central axis of the coke drum CD to the inner wall of the coke drum CD can be accurately inspected in the plane perpendicular to the central axis of the coke drum CD.

When the rotating section 55 of the measuring section 50 makes one rotation,
The drive motor 63 is stopped and the rotation of the rotating unit 55 is stopped. Then, the stepping motor 41 is driven and the elevating cable 43 is paid out, so that the measuring unit 50 descends. Then, when the lifting cable 43 is fed out by a fixed amount, the stepping motor 41 is stopped, and the measuring unit 50 is lowered by a fixed amount and stopped.

When the measuring unit 50 stops, the drive motor 63
Is activated and the rotating portion 55 of the measuring unit 50 is rotated, the measuring means 70 can inspect the inner wall of the coke drum CD at the height at which the measuring unit 50 is stopped over the entire circumference. Moreover, since the measuring unit 50 is supported by the plurality of guide cables 30 so that its central axis is located at the central axis of the coke drum CD, the measuring unit 50 does not tilt when descending, and its central axis is always Coke drum C
It descends while keeping the center axis of D aligned. Therefore, the distance between the laser sensor 72 and the center axis of the coke drum CD is a constant distance, and the vertical deformation of the inner wall of the coke drum CD can be accurately inspected.

By repeating the above operation and moving the measuring unit 50 to the lower end of the coke drum CD, the inner wall of the coke drum CD can be inspected from the upper end to the lower end over the entire circumference.

Therefore, according to the coke drum inspection device 1 of this embodiment, the elevating means 40 causes the measuring section 50 to move.
By moving up and down along the plurality of guide cables 30, the inner wall of the coke drum CD can be inspected over the entire circumference from the upper end to the lower end.

Moreover, since the measuring unit 50 is supported by the plurality of guide cables 30 so that its central axis is located at the central axis of the coke drum CD, the measuring unit 50 is prevented from tilting when moving up and down. The center axis of the coke drum can always coincide with the center axis of the coke drum.
Therefore, the vertical deformation of the inner wall of the coke drum CD can be accurately inspected.

Even if the measuring unit 50 is moved up and down,
Since the central axis of the measuring unit 50 always coincides with the central axis of the coke drum CD, it is necessary to perform the correction measurement for correcting the deviation of the central axis of the measuring unit 50 from the central axis of the coke drum CD. Since it does not exist, the number of working steps can be reduced. Further, since it is not necessary to correct the measured inspection result, post-processing of the measurement result is easy.

The measuring section 50 is moved up and down by driving the stepping motor 41 of the elevating means 30 to wind up and down the elevating cable 43, and the measuring section 50 is moved up and down. Since it is determined by the rotation amount of the stepping motor 41, the measuring unit 5
It is possible to raise and lower 0 accurately by a fixed amount. Therefore, the measurement unit 50 can accurately inspect the vertical deformation of the inner wall of the coke drum CD.

As described above, according to the coke drum inspection device 1, the deformation of the inner wall of the coke drum CD can be accurately grasped, the inspection result is reproducible, the number of inspection work steps is small, and the inspection result This has the effect that post-processing is easy.

Furthermore, the position of the measuring section 50 displayed on the position control monitor of the control means 75 (coke drum CD
An image showing the height in the inside and the angle with respect to the central axis thereof is photographed by the video camera 77 for photographing the control unit, and the recording means 76 is simultaneously recorded with the image of the inner wall of the coke drum CD photographed by the video camera 71 for photographing the inner wall. If it is recorded in, the image of the inner wall of the coke drum CD and the display of the shooting position thereof can be displayed on the same image of the video monitor, so that the abnormal portion in the coke drum CD can be specified.

[0055]

According to the first aspect of the present invention, the inner wall of the coke drum can be inspected from the upper end to the lower end, and moreover, the central axis of the measuring portion can be always aligned with the central axis of the coke drum. Therefore, the vertical deformation of the inner wall of the coke drum can be accurately inspected. According to the second aspect of the present invention, the plurality of guide cables can be easily arranged at the rotationally symmetrical positions with respect to the center axis of the coke drum simply by attaching the upper mount and the lower mount. According to the invention of claim 3, the vertical deformation of the inner wall of the coke drum can be accurately inspected, and the reproducibility of the inspection result can be improved. According to the invention of claim 4, the inner peripheral surface of the coke drum can be measured, and the vertical deformation of the inner wall of the coke drum can be accurately inspected. According to the fifth aspect of the invention, the inspection time can be shortened without lowering the measurement accuracy, as compared with the case where there is one laser sensor. According to the invention of claim 6, it is possible to specify the position of the abnormality occurrence location on the inner surface of the coke drum, which is found by the video inspection.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a usage state of a coke drum inspection device 1 of the present embodiment.

FIG. 2 is a schematic plan view of an upper mount 10.

FIG. 3 is a schematic side view of the upper mount 10.

FIG. 4 is a schematic bottom view of the lower pedestal 20.

FIG. 5 is a schematic vertical sectional view of a measuring unit 50.

FIG. 6 is a schematic plan view of a measuring unit 50.

FIG. 7 is a schematic vertical sectional view of a measuring section 50 provided with two laser sensors 72.

FIG. 8 is an explanatory diagram of a usage state of a conventional coke drum inspection device 100.

[Explanation of symbols]

1 Coke drum inspection device 10 Upper mount 15 Upper template 20 Lower mount 25 Lower template 30 guide cable 40 Lifting means 41 Stepping motor 42 drums 43 Lifting cable 50 Measuring section 51 body 55 Rotating part 70 Measuring means 72 Laser sensor CD coke drum TM Top Manhole BM Bottom Manhole

Claims (6)

[Claims] 1. An inspection device for inspecting a coke drum for producing coke, comprising: an upper mount attached to an upper end of the coke drum, and a lower mount attached to a lower end of the coke drum. A plurality of guide cables provided inside the coke drum parallel to the central axis of the coke drum between the lower mount and the upper mount, and vertically movable along the plurality of guide cables. A measuring unit for inspecting the inner wall of the coke drum, and elevating means for elevating and lowering the measuring unit, wherein the upper cradle connects the upper ends of the plurality of guide cables to the coke drum. The lower pedestal is provided with an upper template that is supported in a rotationally symmetric position with respect to the central axis, and the lower pedestal connects the lower ends of the plurality of guide cables to the coke drum. A lower template that is supported at a position that is rotationally symmetric with respect to the mandrel is provided, and the measurement unit is supported by the plurality of guide cables such that the central axis thereof coincides with the central axis of the coke drum. A coke drum inspection device characterized in that 2. A top manhole in which an insertion hole having a center on the central axis of the coke drum is formed is provided at an upper end of the coke drum, and a center of the insertion hole is formed on an outer periphery of the top manhole. A plurality of through holes are formed at rotationally symmetrical positions with respect to each other, and the outer periphery of the upper pedestal is rotationally symmetric with respect to its central axis and the distance from the central axis is the center of the insertion hole of the top manhole. To the through hole, a plurality of fixing holes are formed at the same position as the distance from the through hole to the through hole, and the upper template has a central axis that coincides with the central axis of the upper frame. And a bottom manhole in which a discharge hole having a center on the central axis of the coke drum is formed is provided at the lower end of the coke drum. In the circumference, a plurality of through holes are rotationally symmetric with respect to the center of the discharge hole, and the distance from the center axis thereof is the same as the distance from the center of the discharge hole of the bottom manhole to the through hole. Is formed, a plurality of fixing holes are formed on the outer periphery of the lower pedestal at positions that are rotationally symmetric with respect to the central axis of the lower pedestal, and the central axis of the lower template is the central axis of the lower pedestal. The lower template is attached to the lower mount so that the fixing holes of the upper template are aligned with the plurality of through holes of the top manhole, and the lower template is attached to the plurality of through holes of the bottom manhole. The coke drum inspection device according to claim 1, wherein the fixing holes are attached together. 3. The elevating means comprises a stepping motor provided on the upper pedestal, a drum attached to a main shaft of the stepping motor, one end of which is wound around an outer circumference of the drum, and the other end of which is used for the measurement. And a lifting cable attached to the section, the stepping motor,
The coke drum inspection device according to claim 1 or 2, further comprising a rotation amount instruction means for indicating a rotation amount of the main shaft with respect to a reference position. 4. The main body part supported by the guide cable, the rotating part provided around the main body part and rotatably attached along the outer periphery of the main body part, and the rotating part. 4. A rotating means for rotating the portion, and a measuring means attached to the rotating portion and rotating with the rotating portion for inspecting an inner wall of the coke drum. Coke drum inspection device. 5. The measuring means comprises a plurality of laser sensors for measuring the distance to the inner wall of the coke drum, and the plurality of laser sensors are arranged in multiple stages along the central axis of the coke drum. The measuring units are arranged side by side, and the distance between the plurality of laser sensors in the direction along the central axis of the coke drum is set to 1 by the measuring means.
The coke drum inspection device according to claim 1, 2, 3 or 4, wherein the stepping motor has the same length as an elevating step for elevating and lowering the measuring means when only one is provided. 6. The measuring means includes a video camera for photographing the inner wall of the coke drum,
The control unit is provided with a position display monitor for displaying the position of the measuring unit in the coke drum, and the control unit shooting video camera for shooting the position display monitor of the control unit. The image of the video camera for photographing the inner wall and the image of the video camera for photographing the control unit are simultaneously recorded and displayed on the same screen of a video monitor. Coke drum inspection device.