JPS6344162A - Cracking detector for suction roll shell - Google Patents

Abstract

PURPOSE:To enable the detecting of cracking in numerous suction holes efficiently, by arranging a base, a forward/backward moving section, a slide section, a sensor fixing section, sensors and the like to insert sensors for detection of cracking accurately into the respective holes at a time. CONSTITUTION:This apparatus is provided with a base 10, a forward/backward moving section 30, a slide section 40, a sensor fixing section 60, sensors 70 and the like. The base 10 is retained on the surface of a suction roll shell (SRS) as object to be inspected or other locations to be positioned with respect to the SRS and then, the fixing section 60 is made to approach the surface of the SRS through the moving section 30. At the same time, by the sliding of the slide section 40, the fixing section 60 is positioned with respect to the suction holes (SH) and sets of sensors 70 on the fixing section 60 are each advanced to a SH. Thus, sets of sensors 70 are inserted accurately into the numerous SHs one per one thereby enabling the detecting of cracking in the holes efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for detecting cracks in the roll shell of a papermaking suction roll.

[Conventional technology]

The roll shell, which forms the body of the suction roll for dewatering the wet paper (pulp) produced in the papermaking process, has small holes (suction holes) (SH) that penetrate in the radial direction as dehydration holes, as shown in Figure 8. As shown in the figure, the perforations are formed in a fixed arrangement pattern in the roll axis direction and circumferential direction. Generally, the hole diameter is about 3 to 4 fins, the hole pitch is about 6 to 81, and the total number of holes per roll reaches several tens of thousands.

Suction rolls generate high stress (bending stress, tallashing stress) on the roll shell during dehydration work, and also come into contact with white water (acidic corrosive liquid) that is dehydrated from humid paper, resulting in cracks in the roll shell due to corrosion fatigue, etc. is likely to occur.

This is particularly noticeable on the inner wall of the suction hole and its vicinity, where stress concentration is high, and if left untreated, it will cause a roll breakage accident. Therefore, it is necessary to accurately understand the presence or absence of cracks in the suction hole and the progress of the cracks.

To detect cracks in the suction hole, a sensor is used, for example, as shown in FIG.
2) can be carried out using a probe (72) wrapped around the probe (72) attached to the tip of the support rod (71).

When the probe (72) is inserted into the suction hole (S H) and an alternating current is passed through the coil (722), a closing current is generated in the surrounding conductor (roll shell) due to mutual induction, and the impedance of the coil decreases. do. in this case,
If a crack exists on the inner wall surface of the hole (SH), the effective impedance of the coil increases due to a change in the electrical resistance of the closed current path. Therefore, the presence or absence of a crack and its progress can be determined from the change in impedance of the coil and its amount. Can be judged destructively.

[Problem that the invention seeks to solve]

As mentioned above, the suction holes in a suction roll shell are small in diameter and are provided in large numbers at a fine pitch. Therefore, it would be extremely troublesome and unnecessary to insert a sensor into each hole to detect cracks. It is a matter of efficiency and is difficult to put into practical use.

In view of the above, the present invention provides a crack detection device that can accurately insert a crack detection sensor into each of a large number of suction holes at once and efficiently detect cracks in the holes.

[Means for solving problems]

The suction roll shell crack detection device of the present invention has a positioning base (l) with respect to the suction roll to be inspected.
O), and a forward/backward moving unit (30) attached to the base (10) and moving toward or away from the suction roll shell.
, a sliding part (40) that slides in two directions at right angles within a plane perpendicular to the moving direction of the forward/backward moving part (30), and a sensor fixing part (60) connected to the sliding part (40). , the sensor fixing part (60) has a plurality of sensors (70) directed toward the suction hole of the suction roll.
are attached with an arrangement pattern that matches the arrangement pattern of the suction holes.

[Effect]

After positioning the base (10) of the crack detection device of the present invention with respect to the suction roll shell by locking it to the surface of the suction roll shell to be inspected or another predetermined location, the advancing/retreating part (30) is moved. The sensor fixing part (60) is brought close to the surface of the suction roll shell through the slider, and the sensor fixing part (60) is moved to the suction hole by sliding the slide part (40).
After positioning the sensor fixing part (60),
By advancing the AM sensors (70) toward the suction holes, each of the set of sensors (70) is accurately inserted into each of the multiple suction holes.

〔Example〕

FIG. 1 shows an embodiment of the crack detection device of the present invention.

Figures 2 (CI) and (II) show the crack detection device installed on the suction roll shell that is the object to be inspected.

The base (10) has positioning legs (2
0) is the suction hole of the suction roll shell (
SH) is attached at a position corresponding to the array pattern.

As shown in FIG. 3, each leg (20) of the base includes a magnetic base (24), and a magnetic base (24) and a base (10) for placing the base (10) in a horizontal position. A wedge (2
2). The wedge (22) has a locking protrusion (23) on its contact surface with the base (10), and the protrusion (23) can be attached to and removed from the recess (21) provided on the lower surface of the base (10). They fit together freely. In addition, a magnetic base (24
) is a protrusion (25) that fits into the suction hole (S H).
)have. When installing the crack detection device on the suction roll shell, remove the magnet base (24) from the bottom surface of the base (10) and place each one on the base (10).
10) The suction hole (S
H) and the base (22) via the wedge (22).
10) and attach the wedge (22) to the magnetic base (2).
It is only necessary to fix it to the magnet base (24) by the suction force of 4), thereby making it possible to position the entire device at a predetermined location on the suction roll shell and to stabilize its installation posture.

The forward/backward moving unit (30) includes a stage (32) and a stage drive motor (33) attached to the back of the stage.
and an arm (34) attached to the front surface of the stage. (31) is a stage fixing stand vertically installed on the base (10). The stage (32) is moved along the plate surface of the stage fixing base (31) in a direction perpendicular to the plate surface of the base (10) by the stage drive motor (33). installed on.

Also, on the front side of the stage (32), there is an arm guide groove (32).
L321) is formed in a direction perpendicular to the plate surface of the base (10), and the arm (34) is formed in the arm guide groove (321).
21, 321> so as to be movable in a direction perpendicular to the base (10) plate surface.

The slide part (40) consists of a support plate (41) fixed to the arm (34) of the forward/backward moving part (30), and two slides +& (42) and (43) superimposed on the support plate (41).

The support plate (41), the upper slide plate (42), and the lower slide (opposite (43)) are all connected to the advance/retreat moving part (
30) is perpendicular to the direction of forward and backward movement. As shown in FIG. 4, the upper slide plate (42) has a guiding protrusion (421) in the χ direction formed on its sliding surface with respect to the support plate (41). is fitted into the guide 4 (411) formed on the support plate (41). On the other hand, the upper slide plate (4) of the lower slide +ff1 (43)
The sliding surface for 2) is provided with the guide protrusion in the χ direction (
A guide protrusion (431) in the y direction is formed perpendicular to the guide protrusion (431), and the guide protrusion (431) is fitted into the guide/1l (423) formed on the upper slide plate (42). ing. Also, upper slide + ff1 (42
) and the lower slide plate (43) have ranks (422) and (43) for adjusting the sliding distance on each sliding surface.
2) are provided respectively.

The sensor fixing part (60) is composed of a sensor fixing plate (61), a sensor guide plate (62), a guide rod (63), and a plurality of sensors (70) fixed to the sensor fixing plate (61). A gripping member (
It is attached to the lower slide plate (43) of the slide portion (40) via a 50°50 angle.

Sensor guide holes (621) are bored in the sensor guide plate (62) with an arrangement pattern matching the suction hole (SI-() arrangement pattern) of the suction roll shell, and sensor fixing holes are provided at the four corners of the upper surface of the sensor guide hole (621). Board (61)
A guide rod (63) for mounting is provided vertically, and legs (64) are provided at the four corners of the lower surface.

The legs (64) are provided corresponding to the arrangement pattern of the suction holes (SH) in the same way as the sensor guide holes (621), and the legs (64) are engaged with the suction holes (SH). Each guide hole (621) faces each suction hole (SH).

The sensor fixing plate (61) includes the sensor guide plate (62).
Sensor mounting holes (611) with the same number of sensor guide holes (621) are formed with an arrangement pattern that matches the arrangement pattern of the sensor guide hole (621) group, and sensor mounting holes (611) are formed in the four corners of the sensor fixing plate (61). is the sensor guide plate (6
2) through which the guide rod (63) is inserted.
612) is drilled. The sensor guide plate (62) and the sensor fixing plate (61) are guided by the guide rod (63) and move toward or away from each other. The moving distance between the sensor fixing plate (61) and the sensor guide plate (62) toward and away from each other is approximately equal to the thickness (thickness and suction hole depth) of the suction roll shell (SH), which is the object to be inspected. In addition, the sensor fixing plate (6
A stopper (631) is provided at the top of each guide rod (63) in order to prevent the guide rod (63) from falling out of the hole (612) at the four corners of the guide bar (63).

The sensor (70) attached to the sensor fixing part (60) has a number of sensor guide holes (621) in the sensor guide plate (62) (therefore, the sensor mounting holes (61) in the sensor fixing plate (61)).
A set includes the same number of sensors (70) as the number of holes (6'il), and the upper end of each sensor (70)
1), and its lower part penetrates the sensor guide hole (621) of the sensor guide plate (62) and protrudes to the back side of the sensor guide plate (62).

The sensor (70) is attached to a support rod (71) as shown in FIG.
), a detection probe (72) at its lower end, and an enameled wire (73) extending upward from the detection probe (72).
In order to protect it and to make it smooth to insert into the suction hole (S H), it is preferable to cover almost its entire length with a plastic tube (74).

Also, the sensor (7) is connected to the sensor fixed tffl (61).
0), the sensor fixing plate (61
) is preferably a screw hole, and a sensor vise (75) is preferably attached to the upper end of each sensor (70), as shown in FIG. Sensor vise (
75) is the sensor mounting hole (61) of the sensor fixing plate (61).
The vise body (78) has a threaded part (76) that screws into the screw of 1) and has a slit (77) on the top surface, and a tightening ring (79). Tighten the support rod (71) of the sensor (70) using the ring (79).
) is attached to the upper end. The vise body (78)
facing the sensor mounting hole (611) of the fixing plate (61), and insert the driver (D) into the slit (7) as shown in Fig. 6.
A large number of sensors (70) can be efficiently fixed to each sensor mounting hole (611) by a simple operation of applying the sensor to the sensor 7) and rotating the sensor.

In addition, since the wire diameter of the enamel "41A (73) of the sensor (70) is extremely thin, for example, 0.1 to 0.03 m,
If tension is applied during crack detection work, wires are likely to break. To prevent this, as shown in FIG.
Attach the terminal (613) to the appropriate location of 1 (61) and enamel! (73) should be connected to the terminal (613) once, and then the lead wire (614) should be connected to the main body of the measuring instrument.

In order to detect cracks in the suction roll shell using the crack detection device described above, first, as described above, the magnet base (24) of the leg (20) of the base (10) is connected to the base (10).
Place 1 corresponding to the position of the leg (20) defined at the four corners of
For example, the four suction holes (P), (Q), (R), (S) shown in Fig.
), and the entire device is positioned by placing the base (10) on top of the base (10) via the wedge (22). This positioning allows a set of sensors (
The sensor fixing part (60) having a suction hole (70) faces the region (Rυ).
By matching the arrangement pattern of S 64) (64) (64) (64) is the suction hole (Pi (q) (
r) are positioned substantially opposite to each of (s).

Next, the stage (32) is moved by the stage drive motor (33).
) to bring the sensor fixing part (60) close to the surface of the suction roll shell (SR). At this time, each leg (64) (64) (6
4) If the (64) and the suction hole (pifql (r) (s)) to which they should be locked do not correspond accurately, manually move the slide part (40) in one direction (the χ direction or Each leg (64) (64) (6
4) Connect (64) to the suction hole (pl (ql (
r) (After aligning it vertically above sl, lower the arm (34) and attach each leg (64) (64) (
64) (64) into the suction hole (1)) (ql
(rl (s). Each leg (6
4) (64) (64) (64) and a set of sensors (
Since the arrangement pattern of 70) matches the arrangement pattern of the suction holes (SH), each leg (64) (6
4) A set of sensors (70) by landing (64) (64) in the suction hole as described above.
Each of the areas (suction hole (S
H) for each one accurately as shown in FIG.

After that, if the arm (34) is lowered and the sensor fixing plate (61) of the sensor fixing part (60) is pushed down along the guide plate (63), one set of sensors (70) will be attached to the sensor guide plate. While passing through the sensor guide hole (621) of (62), it enters each suction hole (SH). The insertion depth of the probe (72) at the tip of the sensor (70) inserted into the suction hole (SH) can be freely adjusted by moving the sensor fixing plate (61) up and down.

In this way, the 1 m sensor (70
) After detecting cracks in each suction hole (SH) for one region (Rυ (Fig. 8)) of the suction roll shell surface to be measured, the sensor fixing part (60
) is pulled upward to pull out each sensor (70) from the suction hole (SH), and the entire device is moved to the next location to detect cracks in the suction hole (SH) in the region (R2), for example. In this case, the arrangement pattern of the suction holes (S H) is the same for all areas on the suction roll shell, so there is no need to adjust the slide part (40) after changing the installation position of the detection device. The sensor fixing part (60
), each leg (6) of the sensor guide plate (62)
4) (64) (64) (64) each land on a predetermined suction hole (SH), and each of a set of sensors (70) lands on each suction hole (SH) in the region (R2). to accurately point to.

In this way, detection of cracks in the entire suction roll shell is completed by sequentially performing detection operations for each region while changing the installation position of the detection device.

In the above embodiment, the vertical movement of the arm (34) and the sliding operation of the slide part (40) are manually performed, but the arm (34) and the slide part (40) are provided with a drive device and a drive controller. , sensor fixing part (
60) is equipped with a sensor that detects the suction hole (SH) position, and the arm (34) and slide part (40) are driven and controlled using the suction hole position detection signal as an input signal, thereby fully automating the crack detection work. You can also do that.

Furthermore, in the above embodiment, W! Although the whole sensor is installed on the suction roll shell, it may be installed on a continuous base plate so that the sensor fixing part (60) faces the surface of the suction roll shell. In that case, the sensor fixing part (60) does not necessarily have to face the vertical upper surface of the suction roll shell, but may face the suction roll shell from the lateral direction.

Furthermore, by changing the design of the advance/retreat moving part (30), the sensor fixing part (60) is inserted into the suction roll shell (SF'2>), and the sensor fixing part (60) is inserted into the suction roll shell (SF'2>
A set of sensors can also be inserted into the suction hole (SH) for crack detection.

(Effects of the Invention) According to the present invention, since a plurality of crack detection sensors can be inserted into each suction hole at the same time, cracks in the suction roll can be detected efficiently and non-destructively. Furthermore, the radial position of a crack can be detected from the insertion depth of the sensor in the suction hole, and the position of the suction hole with the crack detected by each sensor can be stored in an external storage device. You can also freely draw a crack distribution map.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the present invention, Fig. 2 [I] is a front explanatory view showing the device of the present invention installed on a suction roll shell, Fig. Fig. 3 is a sectional view showing an example of the leg of the base of the device of the present invention, Fig. 4 is a perspective view showing an example of the sliding part, Fig. 5 is a sectional view showing an example of the sensor, and Fig. 6 is a sensor installation. 7 is a cross-sectional explanatory view showing an example of the embodiment, FIG. 7 is a perspective view of a main part showing an example of a sensor fixing plate, and FIG.
The figure is an explanatory view of the suction hole arrangement pattern of the suction roll shell, and FIG. 9 is an explanatory cross-sectional view of suction hole crack detection by a sensor. lO: Base, 20: Base leg, 22: <rust, 24: Magnet base, 30: Forward/backward movement section, 31: Stage fixing plate, 32: Stage, 34: Arm, 40 Nice slide, 41 Nice slide Support plate, 42.43 Nislide slope,
60: Sensor fixing part, 61: Sensor fixing plate, 62: Sensor guide plate, 63 Ni guide rod, 64: Leg part, 70: Sensor 72 nib lobe, 75: Sensor vise.

Claims (1)

[Claims] (1) A base for positioning the suction roll that is the object to be inspected, an advancing/retracting moving part mounted on the base and moving toward or away from the suction roll shell, and a plane perpendicular to the direction of movement of the advancing/retracting moving part. The sensor fixing part includes a sliding part that slides in two directions at right angles within the interior, and a sensor fixing part connected to the sliding part. A device for detecting cracks in the suction hole of a suction roll shell installed with an arrangement pattern that matches the pattern.