JP7021142B2 - Rotary kiln condition monitoring device - Google Patents

Description

The present invention relates to a condition monitoring device for a rotary kiln.

The rotary kiln heats the processed material supplied to the inside to bake the processed material and incinerate the processed material. The rotary kiln has a kiln shell that is tilted at a predetermined angle with respect to a horizontal plane and is rotated about an axis by a drive unit, and a plurality of kiln tires provided on the outer circumference of the kiln shell. Each kiln tire is supported by a pair of support rollers.

If the operation of the rotary kiln is continued, the kiln shell may be distorted due to, for example, heat load or coaching. When the kiln shell is distorted, for example, the kiln tire may come into contact with only one of the pair of support rollers, and the rotation axis of the support roller may be distorted, or the rotation axis of the support roller may be distorted due to the weight of the kiln shell. be. In this case, if the parallel state between the center of rotation of the kiln shell and the center of rotation of the support roller is broken, a thrust force is generated in the kiln shell, and the kiln shell may move in the axial direction. When the kiln shell moves axially due to various factors including the reasons mentioned above, a force is applied to the member connected to the kiln shell, and the member is damaged or the kiln shell moves axially to the kiln shell. A gap may be created between the force and the member connected to the kiln shell, and the gas generated during the processing of the processed material or the processed material may leak to the outside of the kiln shell.

As a solution to a part of the above problem, Patent Document 1 discloses a roller position adjusting device for adjusting the position of the support roller itself that supports the kiln tire. The roller position adjusting device of Patent Document 1 has a plurality of extrusion force detectors for detecting a force applied to the left and right rollers in the left-right direction, and a plurality of thrust force detectors for detecting the force in the front-rear direction. Further, the apparatus of Patent Document 1 adjusts the position of the support roller by driving the cylinder apparatus based on the signals detected by the extrusion force detector and the thrust force detector.

Japanese Unexamined Patent Publication No. 7-218141

However, the apparatus of Patent Document 1 requires a plurality of extrusion force detectors, a plurality of thrust force detectors, and a plurality of cylinder devices, which makes the device configuration very complicated and the cost very high. Further, in the device of Patent Document 1, only the support roller that supports the kiln tire is controlled, and the axial position of the kiln shell cannot be grasped.

Therefore, in view of the above problems, the present invention provides a rotary kiln condition monitoring device capable of monitoring the condition of the rotary kiln by detecting a change in the axial position of the kiln shell with a simple configuration. With the goal.

The state monitoring device for a rotary kiln according to an embodiment of the present invention has a kiln shell rotatably supported around a predetermined axis of rotation, and an annular member attached to the outer periphery of the kiln shell so as to rotate with the kiln shell. The rotary kiln and the annular member are arranged on at least one side in the axial direction of the kiln shell and separated from the end face of the annular member by a predetermined distance in the axial direction with respect to the rotation axis of the kiln shell. The guide roller has a guide roller having a substantially vertical rotation axis and a rotation detection unit for detecting the number of rotations of the guide roller. When it comes into contact with the guide roller, it is configured to rotate along with the rotation of the kiln shell around the axis, and the position of the kiln shell in the axial direction is determined by the rotation number of the guide roller detected by the rotation detection unit. It is possible to detect the fluctuation of.

Further, the annular member is preferably a kiln tire fitted on the outer periphery of the kiln shell.

Further, it is preferable that the guide rollers are arranged on both sides in the axial direction with respect to the annular member.

Further, the rotation detection unit is a photoelectric sensor provided in the vicinity of the guide roller, and it is preferable that the end surface of the guide roller is provided with a shielding unit that blocks signal light from the photoelectric sensor.

Further, the condition monitoring device further has a control unit connected to the rotation detection unit, and the control unit is the kiln shell according to the rotation speed of the guide roller detected by the rotation detection unit. It is preferable to output the state related to the position in the axial direction.

Further, the control unit compares the rotation speed of the guide roller with a predetermined threshold value, and when the rotation speed of the guide roller is larger than the first threshold value, generates a first alarm and generates the guide roller. It is preferable that the second alarm is generated when the rotation speed of the above is between the first threshold value and the second threshold value smaller than the first threshold value.

Further, the rotation detection unit is a photoelectric sensor provided in the vicinity of the guide roller, and a shielding portion for blocking signal light from the photoelectric sensor is provided on the end surface of the guide roller, and the rotary kiln is provided. Combustible gas is generated by the processing of the internal processed material, and the light source of the photoelectric sensor is provided in a non-explosion-proof environment. It is preferable that they are connected by.

Further, the rotary kiln has a fixed charging section to which a processed material is supplied and is fixedly provided at a predetermined position, and the kiln shell communicates with the fixed loading section and has a first end portion located on the front side of the furnace. The processed material is discharged and has a second end portion located on the furnace butt side, and the fixed charging portion and the first end portion of the kiln shell slide with each other and the fixed charging portion is provided. It is preferable to communicate with each other by a metal seal that seals between the portion and the kiln shell.

Further, a plurality of kiln tires are provided on the outer periphery of the kiln shell at intervals in the axial direction, and the annular member is the kiln tire closest to the first end portion among the plurality of kiln tires, and the guide roller. Is preferably arranged on both sides in the axial direction with respect to the kiln tire closest to the first end portion.

According to the rotary kiln condition monitoring device of the present invention, it is possible to monitor the condition of the rotary kiln by detecting the change in the axial position of the kiln shell with a simple configuration.

It is a schematic diagram of the condition monitoring apparatus of the rotary kiln of one Embodiment of this invention. It is a side view which shows the guide roller used for the condition monitoring apparatus of one Embodiment of this invention. It is a perspective view of the guide roller of FIG. It is a figure which shows the state which the kiln shell moves to the furnace butt side from the state shown in FIG. 2, and the kiln tire and the guide roller are in contact with each other. It is a figure which shows the state which the kiln shell moves to the front side of the furnace from the state shown in FIG. 2, and the kiln tire and the guide roller are in contact with each other. (A) is a perspective view showing a state before the shielding portion provided in the guide roller of the present embodiment blocks the signal light of the photoelectric sensor, and (B) is a perspective view showing the state before the shielding portion blocks the signal light of the photoelectric sensor. It is a perspective view which shows the state of blocking, and (C) is the perspective view which shows the state after the shielding part has passed the signal light of a photoelectric sensor. It is a schematic diagram which shows the control part connected to the state monitoring apparatus of one Embodiment of this invention.

Hereinafter, the condition monitoring device for the rotary kiln according to the embodiment of the present invention will be described with reference to the drawings. The rotary kiln condition monitoring device shown in the following embodiment is merely an example, and the rotary kiln condition monitoring device of the present invention is not limited to the following examples.

FIG. 1 is a schematic view of a rotary kiln condition monitoring device A according to an embodiment of the present invention. As shown in FIG. 1, the rotary kiln 1 is a kiln shell 2 rotatably supported around a predetermined rotation axis Ax, and a kiln tire (annular member) attached to the outer periphery of the kiln shell 2 so as to rotate with the kiln shell 2. ) 3 has.

Further, the rotary kiln 1 is further provided with a support roller 4 that rotatably supports the kiln shell 2, a drive unit D for rotating the kiln shell 2, and an outer periphery of the kiln shell 2, and is rotated by the drive of the drive unit D. It has a drive gear 5 that rotates the kiln shell 2 around the rotation shaft Ax. Further, in the present embodiment, the rotary kiln 1 further includes a fixed charging unit 6 to which a processed material is supplied and fixed at a predetermined position, and a discharge unit 7 for discharging the processed material processed by the rotary kiln 1. It has a heating unit H that heats the kiln shell 2. The fixed loading portion 6 and the kiln shell 2 slide with each other and communicate with each other by a metal seal S that seals between the fixed loading portion 6 and the kiln shell 2. The structure of the rotary kiln 1 is not limited to the structure shown in the figure.

In the present embodiment, the rotary kiln 1 is configured to incinerate rubber products such as tires for vehicles. Specifically, in the rotary kiln 1, the rubber tire, which is a processed product supplied from the fixed charging section 6, moves to the internal space of the kiln shell 2 via the metal seal S and is heated by the heating section H. The rubber tire is heated and melted in the kiln shell 2 that has been made, and is discharged from the discharge portion 7 on the furnace butt side. Specifically, the rubber component of the rubber tire is vaporized and discharged from the discharge section 7, and the metal in the rubber tire is discharged from the discharge section 7 different from the vaporized rubber component in the discharge section 7. ..

The processed material processed by the rotary kiln 1 is not particularly limited. For example, the processed product may be a processed product that produces flammable gas or toxic gas other than rubber tires, or may be a processed product other than that. In the present embodiment, the processed material treated by the rotary kiln 1 generates flammable gas, and the predetermined area around the rotary kiln 1 is an explosion-proof environment E (see FIG. 7). In the present specification, the region outside the predetermined explosion-proof environment E is referred to as a non-explosion-proof environment.

The kiln shell 2 is a hollow tubular body, and rotates around a rotation axis Ax (hereinafter, a direction in which the rotation axis Ax extends is referred to as an axis Ax direction). As shown in FIG. 1, the kiln shell 2 communicates with the fixed charging portion 6, and the first end portion 21 located on the front side of the furnace (on the left side in FIG. 1) and the processed material are discharged, and the processed material is discharged to the furnace bottom. It has a second end 22 located on the side (right side in FIG. 1). In the present embodiment, the kiln shell 2 is arranged so as to be inclined so that the first end portion 21 side is high and the height is lower toward the second end portion 22 side.

The kiln shell 2 has a drive gear 5 on the outer periphery thereof, and the drive gear 5 is driven by the drive unit D to rotate, so that the kiln shell 2 rotates around the rotation shaft Ax. The structure of the drive unit D is not particularly limited. In the present embodiment, the drive unit D has a motor D1, a speed reducer D2, and a pinion gear D3, and the driving force of the motor D1 is transmitted to the drive gear 5 via the speed reducer D2 and the pinion gear D3. ..

The kiln shell 2 is connected to the fixed loading portion 6 at the first end portion 21 via a metal seal S. As shown in FIG. 1, the metal seal S has a pair of plate-shaped seal members S1 and S2. One of the seal members S1 is fixed to the fixed loading portion 6, and the other seal member S2 is provided on the kiln shell 2. The seal member S1 and the seal member S2 slide with each other while the fixed loading portion 6 and the kiln shell 2 are attached to each other. The space is sealed.

As shown in FIG. 1, a plurality of kiln tires 3 are provided on the outer periphery of the kiln shell 2 so as to be separated from each other in the axis Ax direction. The kiln tire 3 is fitted on the outer circumference of the kiln shell 2 and fixed to the kiln shell 2. Each of the kiln tires 3 is supported by a pair of (at least two) support rollers 4. The support roller 4 is provided so as to rotate around a rotation axis in a direction parallel to the rotation axis Ax. In the present embodiment, the support rollers 4 are provided below the kiln tire 3 so as to support the kiln tire 3 at two positions separated from each other in the circumferential direction of the kiln tire 3. The number of support rollers 4 is not particularly limited, and may be three or more.

In this embodiment, the condition monitoring device A further has a guide roller 8 on at least one side in the axial Ax direction with respect to the kiln tire 3. In the present embodiment, as shown in FIGS. 1 to 3, the guide roller 8 is provided with respect to the first guide roller 81 located on the furnace bottom (second end 22) side with respect to the kiln tire 3 and the kiln tire 3. It has a second guide roller 82 located on the front side of the furnace (first end 21).

As shown in FIG. 2, the first guide roller 81 is arranged at a predetermined distance in the axis Ax direction with respect to the end surface 31 of the kiln tire 3, and rotates substantially perpendicular to the rotation axis Ax of the kiln shell 2. It has an axis Ax2. Specifically, the first guide roller 81 is rotatably provided around the rotation axis Ax2 extending in the substantially vertical direction below the kiln shell 2. The first guide roller 81 may be provided above the kiln shell 2 or lateral to the kiln shell 2 as long as it can rotate around the rotation axis Ax2 substantially perpendicular to the rotation axis Ax of the kiln shell 2. It may be provided in.

The first guide roller 81 comes into contact with the end surface 31 of the kiln tire 3 when the kiln shell 2 moves toward the furnace butt side (second end portion 22 side) in the axial Ax direction (see FIG. 4). The first guide roller 81 functions as a stopper for suppressing further movement of the kiln shell 2 toward the furnace butt side by the kiln shell 2 moving in the axial Ax direction and coming into contact with the end surface 31 of the kiln tire 3. Therefore, for example, in the present embodiment, the seal member S1 and the seal member S2 of the metal seal S are separated from each other in the axis Ax direction to prevent flammable gas, processed matter, and the like from leaking from the inside of the kiln shell 2 to the outside. be able to.

Further, the first guide roller 81 comes into contact with the end surface 31 of the kiln tire 3 and rotates around the rotation shaft Ax2 as the kiln tire 3 rotates around the shaft Ax. Therefore, the first guide roller 81 is in contact with the kiln tire 3 and rotates, thereby restricting the movement of the kiln shell 2 in the axis Ax direction without hindering the rotation of the kiln shell 2 around the axis Ax. The structure of the first guide roller 81 is not particularly limited, but may be, for example, a thrust roller bearing.

The distance between the first guide roller 81 and the end face 31 of the kiln tire 3 is not particularly limited, but the kiln tire 3 is moved before the kiln shell 2 moves in the axial Ax direction at a distance that hinders the operation of the rotary kiln 1. 1 The separation distance is set so as to come into contact with the guide roller 81. The separation distance between the first guide roller 81 and the end face 31 of the kiln tire 3 is not particularly limited, but may be, for example, 2 to 20 mm. The first guide roller 81 may be movable in the axial Ax direction with respect to the end surface 31 of the kiln tire 3 so that the separation distance can be adjusted. In this case, the first guide roller is set by resetting the separation distance according to the state at the time of operation of the rotary kiln 1, such as when the initial state of the rotary kiln 1 and the state after long-term operation are different. The rotation detection unit 9 described later with the 81 makes it possible to more accurately determine the movement of the kiln shell 2 in the axis Ax direction.

As shown in FIG. 2, the second guide roller 82 is arranged at a predetermined distance in the axis Ax direction with respect to the end surface 32 of the kiln tire 3, and rotates substantially perpendicular to the rotation axis Ax of the kiln shell 2. It has an axis Ax3. Specifically, the second guide roller 82 is rotatably provided around the rotation axis Ax3 extending in the substantially vertical direction below the kiln shell 2. The second guide roller 82 may be provided above the kiln shell 2 or lateral to the kiln shell 2 as long as it can rotate around the rotation axis Ax3 substantially perpendicular to the rotation axis Ax of the kiln shell 2. It may be provided in.

The second guide roller 82 comes into contact with the end surface 32 of the kiln tire 3 when the kiln shell 2 moves in the axial Ax direction toward the front side of the furnace (first end portion 21 side) (see FIG. 5). The second guide roller 82 functions as a stopper that suppresses further movement of the kiln shell 2 to the front side of the furnace by the kiln shell 2 moving in the axial Ax direction and coming into contact with the end surface 32 of the kiln tire 3. As a result, for example, the kiln shell 2 moves to the front side of the furnace, and a large force is applied between the seal member S1 and the seal member S2 of the metal seal S in the axial Ax direction to prevent the metal seal S from being damaged. be able to.

Further, the second guide roller 82 comes into contact with the end surface 32 of the kiln tire 3 and rotates around the rotation axis Ax3 as the kiln tire 3 rotates around the axis Ax. Therefore, the second guide roller 82 is in contact with the kiln tire 3 and rotates, thereby restricting the movement of the kiln shell 2 in the axis Ax direction without hindering the rotation of the kiln shell 2 around the axis Ax. The structure of the second guide roller 82 is not particularly limited, but may be, for example, a thrust roller bearing.

The separation distance between the second guide roller 82 and the end surface 32 of the kiln tire 3 is not particularly limited, but the kiln tire 3 is moved before the kiln shell 2 moves in the axial Ax direction at a distance that hinders the operation of the rotary kiln 1. 2 The separation distance is set so as to come into contact with the guide roller 82. The separation distance between the second guide roller 82 and the end face 32 of the kiln tire 3 is not particularly limited, but may be, for example, 2 to 20 mm. The second guide roller 82 may be movable in the axial Ax direction with respect to the end surface 32 of the kiln tire 3 so that the separation distance can be adjusted. In this case, the second guide roller is set by resetting the separation distance according to the state at the time of operation of the rotary kiln 1, such as when the initial state of the rotary kiln 1 and the state after long-term operation are different. The rotation detection unit 9 described later with the 82 makes it possible to more accurately determine the movement of the kiln shell 2 in the axis Ax direction.

The guide roller 8 may have at least one of the first guide roller 81 and the second guide roller 82 according to the performance required for the rotary kiln 1. In the present embodiment, both the first guide roller 81 and the second guide roller 82 are arranged on both sides of the kiln tire 3 in the axial Ax direction. In this case, movement in both directions can be suppressed in the axis Ax direction of the kiln shell 2.

Further, as shown in FIGS. 1 to 3, the condition monitoring device A of the present embodiment has a rotation detection unit 9 for detecting the rotation speed of the guide roller 8. The change in the position of the kiln shell 2 in the axis Ax direction can be detected by the rotation speed of the guide roller 8 detected by the rotation detection unit 9. In addition, "rotational speed" in this specification is used in the meaning including other corresponding parameters which can be converted into the rotational speed (rpm), such as an angle of rotation and a rotational speed.

As described above, the condition monitoring device A of the present embodiment can detect the change in the position of the kiln shell 2 in the axis Ax direction by detecting the rotation speed of the guide roller 8 by the rotation detection unit 9. For example, when the kiln shell 2 moves to the furnace butt side (second end 22 side) in the axis Ax direction from the initial state shown in FIG. 2, the kiln shell 2 moves to the right together with the kiln tire 3. When the amount of movement of the kiln shell 2 is smaller than the separation distance between the first guide roller 81 and the end face 31 of the kiln tire 3, the end face 31 of the kiln tire 3 does not come into contact with the first guide roller 81. Therefore, the first guide roller 81 does not rotate around the rotation axis Ax2, the rotation of the first guide roller 81 is not detected by the rotation detection unit 9, and it can be determined that the rotary kiln 1 is in a state where there is no problem. Become. On the other hand, when the movement amount of the kiln shell 2 becomes a predetermined amount, that is, the separation distance between the first guide roller 81 and the end face 31 of the kiln tire 3, the end face 31 of the kiln tire 3 becomes the first as shown in FIG. Contact the guide roller 81. When the end surface 31 of the kiln tire 3 comes into contact with the first guide roller 81, the first guide roller 81 rotates around the rotation shaft Ax2. The rotation of the first guide roller 81 around the rotation axis Ax2 is detected by the rotation detection unit 9, it is found that the rotary kiln 1 is moving in the axis Ax direction, and it is determined that the rotary kiln 1 is in an abnormal state.

Similarly, when the kiln shell 2 moves to the furnace front side (first end 21 side) in the axial Ax direction, the kiln shell 2 moves to the left side together with the kiln tire 3 from the initial state shown in FIG. When the movement amount of the kiln shell 2 is smaller than the separation distance between the second guide roller 82 and the end face 32 of the kiln tire 3, the end face 32 of the kiln tire 3 does not come into contact with the second guide roller 82. Therefore, if the second guide roller 82 does not rotate around the rotation axis Ax3, the rotation of the second guide roller 82 is not detected by the rotation detection unit 9, and the rotation of the first guide roller 81 is not detected, the rotary kiln It is possible to determine that 1 is in a state where there is no problem. On the other hand, when the movement amount of the kiln shell 2 becomes a predetermined amount, that is, the separation distance between the second guide roller 82 and the end face 32 of the kiln tire 3, the end face 32 of the kiln tire 3 becomes the second as shown in FIG. Contact the guide roller 82. When the end surface 32 of the kiln tire 3 comes into contact with the second guide roller 82, the second guide roller 82 rotates around the rotation axis Ax3. The rotation of the second guide roller 82 around the rotation axis Ax3 is detected by the rotation detection unit 9, it is found that the rotary kiln 1 is moving in the axis Ax direction, and it is determined that the rotary kiln 1 is in an abnormal state.

As described above, in the present embodiment, the guide rollers 8 (first guide roller 81, second guide roller 82) are arranged in the axial Ax direction with respect to the kiln tire 3, and the rotation thereof is detected by the rotation detection unit 9. This makes it possible to detect changes in the position of the kiln shell 2 in the axis Ax direction with a simple configuration. As a result, the condition monitoring device A can monitor the condition of the rotary kiln 1.

The type and structure of the rotation detection unit 9 are not particularly limited as long as the rotation of the guide roller 8 can be detected. In the present embodiment, as shown in FIGS. 2 and 3, the rotation detection unit 9 is a photoelectric sensor (hereinafter referred to as a photoelectric sensor 9) provided in the vicinity of the guide roller 8, and is an end face of the guide roller 8. Is provided with a shielding portion B. As a result, when the guide roller 8 rotates, the signal light L from the photoelectric sensor 9 is cut off, and the rotation speed (rpm) of the guide roller 8 is detected.

Specifically, in the present embodiment, as shown in FIGS. 2 and 3, the photoelectric sensor 9 has a support portion SP that supports the photoelectric sensor 9 from a base BS that rotatably supports the guide roller 8. Is extended, and the photoelectric sensor 9 is arranged at a position facing the end surface of the guide roller 8. In the present embodiment, the photoelectric sensor 9 has a light projecting unit 91 and a light receiving unit 92, and the light projecting unit 91 and the light receiving unit 92 are provided from the end surface of the guide roller 8 in the present embodiment. The shielding portion B extends at a position and length capable of blocking the signal light L between them. As a result, when the guide roller 8 rotates, as shown in FIGS. 6A to 6C, the shielding portion B blocks the signal light L, and the rotation speed of the guide roller 8 can be detected. Become. Although the photoelectric sensor 9 uses a transmissive photoelectric sensor in this embodiment, a retrospective reflection type or reflection type photoelectric sensor may be used as long as the rotation speed of the guide roller 8 can be detected. do not have.

The rotation detection unit 9 may use a means other than the photoelectric sensor as long as it can detect the rotation speed of the guide roller 8. Further, in the present embodiment, the shielding portion B is shown as a columnar pin, but the shape and structure of the shielding portion B are not particularly limited. Further, the rotation detection unit 9 and the shielding unit B may be provided on the end surface of the end surface of the guide roller 8 facing the surface of the kiln shell 2, or may be provided on the end surface on the opposite side.

In the present embodiment, the condition monitoring device A has a control unit C connected to the rotation detection unit 9 as shown in FIGS. 1 and 7. The information (rotational speed) detected by the rotation detection unit 9 is transmitted to the control unit C. The control unit C outputs a state regarding the position of the kiln shell 2 in the axis Ax direction according to the rotation speed of the guide roller 8 detected by the rotation detection unit 9. Specifically, the control unit C compares the rotation speed received by the reception unit C1 with the reception unit C1 that receives the rotation speed information detected by the rotation detection unit 9, and the kiln shell 2 It has a determination unit C2 for determining whether or not the position in the axis Ax direction is in an abnormal position, and an output unit C3 for outputting according to the determination result of the determination unit C2. As a result, when the determination unit C2 determines that the position of the kiln shell 2 in the axis Ax direction is abnormal, the output of the output unit C3 can monitor the state of the rotary kiln 1. The output by the output unit C3 may be, for example, a lamp of a predetermined color may be turned on, may be an audio output, may be displayed on a monitor, or may be a combination thereof. ..

The control unit C may be configured to determine the state of the kiln shell 2 step by step by using a plurality of threshold values. For example, the control unit C generates a first alarm when the rotation speed of the guide roller 8 is larger than the first threshold value, and the rotation speed of the guide roller 8 is higher than the first threshold value and the first threshold value. It may be configured to generate a second alarm when it is between a small second threshold. In this case, for example, when the rotation speed of the guide roller 8 exceeds the first threshold value, it is determined that the end face (end face 31 or 32) of the kiln tire 3 is in a state of being substantially in contact with the guide roller 8. When the rotation speed of the guide roller 8 is between the first threshold value and the second threshold value, the guide roller 8 is not in constant contact with the end face of the kiln tire 3 but in intermittent contact. Can be judged. Therefore, for example, it is determined that the position of the kiln shell 2 in the axis Ax direction is not completely abnormal, but it is necessary to adjust the components of the condition monitoring device A such as the deformation of the kiln tire 3 and the guide roller 8. It will be possible.

More specifically, for example, the rotation speed of the kiln shell 2 in the normal operation of the rotary kiln 1 is 3 rpm, and the rotation speed of the guide roller 8 is 24 rpm when the guide roller 8 is in constant contact with the kiln tire 3. do. In such a case, for example, when the first threshold value is 20 rpm and the rotation speed of the guide roller 8 detected by the rotation detection unit 9 is 20 rpm or more in the actual operating state, the guide roller 8 is substantially the kiln tire 3. Assuming that the position of the kiln shell 2 in the axis Ax direction is in a dangerous position, for example, the output unit C3 turns on a red lamp indicating that it is dangerous, and confirms with the operator and the administrator. prompt. Further, for example, when the rotation speed of the guide roller 8 detected by the rotation detection unit 9 exceeds 4 rpm and is less than 20 rpm with the second threshold value set to 4 rpm, is the kiln shell 2 moving to some extent in the axis Ax direction? Since deformation of the kiln tire 3 and other members is suspected, the output unit C3 lights a yellow lamp indicating that adjustment is necessary, and prompts the operator and the manager to confirm at a predetermined timing. When the rotation speed of the guide roller 8 detected by the rotation detection unit 9 is 4 rpm or less, it is considered that there is no problem and the green lamp is turned on. Even when the rotation speed of the guide roller 8 detected by the rotation detection unit 9 is 20 rpm or more, or when the rotation speed exceeds 4 rpm and is less than 20 rpm, the guide roller 8 serves as a stopper in the axial Ax direction of the kiln shell 2. Therefore, the movement in the axis Ax direction is restricted, and the guide roller 8 rotates and does not interfere with the rotation of the kiln shell 2, so that the normal operation of the rotary kiln 1 can be maintained.

The first threshold value and the second threshold value are not limited to the above-mentioned rotation speed. For example, the first threshold value is a rotation speed between 60 to 100%, preferably 70 to 100%, of the rotation speed of the guide roller 8 when the guide roller 8 is in constant contact with the kiln tire 3. be able to. The second threshold value is a rotation speed between 10 and 30%, preferably between 10 and 20% of the rotation speed of the guide roller 8 when the guide roller 8 is in constant contact with the kiln tire 3. be able to.

Further, in the present embodiment, since the rotary kiln 1 generates flammable gas, the control unit C is installed in a non-explosion-proof environment (outside the explosion-proof environment E) as shown in FIG. 7. The light projecting unit 91 of the photoelectric sensor 9 is arranged in the explosion-proof environment E, but in the present embodiment, the light source 93 of the photoelectric sensor 9 is provided in the non-explosion-proof environment, and the photoelectric sensor 9 is arranged in the explosion-proof environment E. The light projecting unit 91 and the light source 93 of the photoelectric sensor 9 are connected by an optical fiber F. This makes it possible to prevent accidents such as explosions.

Further, in the present embodiment, as shown in FIG. 1, the guide rollers 8 are arranged on both sides in the axial Ax direction with respect to the kiln tire 3 closest to the first end portion 21 of the kiln shell 2. In the present embodiment, the rotary kiln 1 has a fixed input portion 6 which is fixedly provided, and even if the kiln shell 2 extends in the axial Ax direction due to heat, the first end portion 21 side is the second end portion. Compared to the 22 side, it is less susceptible to displacement due to heat in the axial Ax direction. Therefore, by providing the guide roller 8 at the position of the kiln tire 3 closest to the first end portion 21 of the kiln shell 2, more accurate determination can be made without being affected by the extension of the kiln shell 2 due to heat.

In the present embodiment, the guide rollers 8 are provided only in one place among the plurality of kiln tires 3, but the guide rollers 8 are provided in two or more places of the plurality of kiln tires 3 and all the parts of the kiln tires 3. It may have been. In this case, in consideration of the extension of the kiln shell 2, the separation distance between the end face of the kiln tire 3 and the guide roller 8 is gradually increased toward the second end portion 22, and the separation distance is increased according to the position of the kiln tire 3. May be varied.

In the above embodiment, the movement of the kiln shell 2 in the axis Ax direction is detected through the contact between the kiln tire 3 and the guide roller 8, but in the condition monitoring device A of the present invention, the kiln tire is used. Other than 3, the annular member externally fitted to the kiln shell 2 may be configured so that the guide roller 8 comes into contact with the guide roller 8. For example, in addition to the kiln tire 3, an annular member that is not supported by the support roller 4 may be separately attached to the outer periphery of the kiln shell 2 and the guide roller 8 may be arranged so as to face the end surface of the annular member. Further, this annular member may be a drive gear 5.

1 Rotary kiln 2 Kiln shell 21 1st end 22 2nd end 3 Kiln tire (annular member)
31 End face of kiln tire 32 End face of kiln tire 4 Support roller 5 Drive gear 6 Fixed input part 7 Discharge part 8 Guide roller 81 1st guide roller 82 2nd guide roller 9 Rotation detection part (photoelectric sensor)
91 Light flooding unit 92 Light receiving unit 93 Light source A Condition monitoring device Ax, Ax2, Ax3 Rotating shaft B Shielding unit BS base C Control unit C1 Receiver unit C2 Judgment unit C3 Output unit D Drive unit D1 Motor D2 Reducer D3 Pinion gear E Explosion-proof environment F Optical fiber H Heating part L Signal light S Metal seal S1, S2 Seal member SP Support part

Claims (9)

A kiln shell rotatably supported around a predetermined axis of rotation, and a rotary kiln having an annular member attached to the outer periphery of the kiln shell so as to rotate with the kiln shell.
Arranged at least one side in the axial direction of the kiln shell with respect to the annular member, separated from the end face of the annular member by a predetermined distance in the axial direction, and substantially perpendicular to the rotation axis of the kiln shell. A guide roller with a rotating shaft and
It has a rotation detection unit that detects the rotation speed of the guide roller.
The guide roller is configured to rotate with rotation around the axis of the kiln shell when the kiln shell moves in the axial direction and the end face of the annular member comes into contact with the guide roller.
The change in the position of the kiln shell in the axial direction can be detected by the rotation speed of the guide roller detected by the rotation detection unit.
Condition monitoring device for rotary kiln. The rotary kiln condition monitoring device according to claim 1, wherein the annular member is a kiln tire fitted on the outer periphery of the kiln shell. The rotary kiln condition monitoring device according to claim 1 or 2, wherein the guide rollers are arranged on both sides of the annular member in the axial direction. The rotation detection unit is a photoelectric sensor provided in the vicinity of the guide roller, and a shielding unit for blocking signal light from the photoelectric sensor is provided on an end surface of the guide roller, claims 1 to 3. The condition monitoring device for the rotary kiln according to any one of the above items. The condition monitoring device further has a control unit connected to the rotation detection unit.
The one according to any one of claims 1 to 4, wherein the control unit outputs a state regarding the axial position of the kiln shell according to the rotation speed of the guide roller detected by the rotation detection unit. Condition monitoring device for rotary kiln. The control unit compares the rotation speed of the guide roller with a predetermined threshold value, and determines the rotation speed of the guide roller.
When the rotation speed of the guide roller is larger than the first threshold value, the first alarm is generated.
5. The fifth aspect of the present invention is configured to generate a second alarm when the rotation speed of the guide roller is between the first threshold value and a second threshold value smaller than the first threshold value. The described rotary threshold condition monitoring device. The rotation detection unit is a photoelectric sensor provided in the vicinity of the guide roller, and a shielding portion for blocking signal light from the photoelectric sensor is provided on an end surface of the guide roller.
The rotary kiln produces flammable gas by processing the internal processed material,
The light source of the photoelectric sensor is provided in a non-explosion-proof environment.
The rotary kiln condition monitoring device according to claim 5 or 6, wherein the light projecting unit of the photoelectric sensor and the light source of the photoelectric sensor are connected by an optical fiber, which is arranged in an explosion-proof environment. The rotary kiln has a fixed loading section to which the processed material is supplied and fixedly provided in a predetermined position.
The kiln shell has a first end portion that communicates with the fixed charging portion and is located on the front side of the furnace, and a second end portion on which the processed material is discharged and is located on the bottom side of the furnace.
Any of claims 1 to 7, wherein the fixed charging portion and the first end portion of the kiln shell slide with each other and communicate with each other by a metal seal that seals between the fixed charging portion and the kiln shell. The condition monitoring device for the rotary kiln according to item 1. A plurality of kiln tires are provided on the outer periphery of the kiln shell at intervals in the axial direction.
The annular member is the kiln tire closest to the first end portion among the plurality of kiln tires.
The guide rollers are arranged on both sides in the axial direction with respect to the kiln tire closest to the first end portion.
The condition monitoring device for a rotary kiln according to claim 8.

Images