JPH09141495A - Temporary assembly method and device for rotary kiln - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to easily execute the temporary assembly work of shells to be welded. SOLUTION: Both shells S1, S2 to be welded are drawn toward each other by using a jack 51 in this method. The working to draw the shells toward each other is executed while the travels of the respective jacks are detected and subjected to feedback control. The device consists of first and second supporting bodies 31, 41 fixed to the inside surfaces near the ends of both shells and the jacks 51 interposed therebetween. The first supporting body is composed of a first contact plate 32 and a first supporting plate 32. The second supporting body is composed of a mounting part 42, an arm protective film 43, a second contact plate 45 facing the first contact plate and a second supporting plate 46.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for temporarily assembling the ends of shells to be welded in abutting state when welding the ends of cylindrical shells forming a rotary kiln, and its application. It is related to the device.

[0002]

2. Description of the Related Art In a cement plant for producing cement, a rotary kiln is arranged as a device for firing a clinker which is a raw material for cement. As shown in FIG. 5, this rotary kiln is formed from a large number (7 in FIG. 5) of cylindrical bodies P1 to P7 that are integrated, and includes a first, second, and third support bases B1, In B2 and B3,
First, second, and third rotating devices R1 and R for rotating the rotary kilns K that are respectively inclined.
2 and R3 are arranged and rotary kiln K
A burner (not shown) for firing the clinker is arranged at the lower end of the.

The clinker firing process by the rotary kiln K is performed by the first, second and third rotating devices R1, R2, R.
3 is driven by rotating the rotary kiln K while introducing the clinker from the clinker input port K1 and blowing a flame into the rotary kiln K by a burner. As a result, rotary kiln K
The inner clinker repeatedly lifts up and falls along the inner peripheral surface of the rotary kiln K as it rotates, and descends along the inclination of the rotary kiln K,
It is discharged from the clinker discharge port K2 of the rotary kiln K and sent to the next step.

By the way, the rotary kiln K for carrying out the clinker firing process as described above is formed from the seven cylinders P1 to P7 as described above. Shells made of steel cylindrical pipes forming the outer shells of P1 to P7 are sequentially brought into contact with each other by butt welding to integrate them, and then heat resistant bricks are formed on the inner surface of the integrated shell. Work is done. When performing the welding work of the shell, a jig 1 as shown in FIG. 3 is used to perform the temporary assembly. The jig 1 includes a pair of angle members 2a,
Two sets of 2b, a first washer 3 and a first nut 4 arranged between these two sets of angle members 2a, 2b, a bolt 5, and an outside of the two sets of angle members 2a, 2b. It is composed of a second washer 6 and a second nut 7.

In order to temporarily assemble the two shells S1 and S2 to be welded by using the jig 1 described above, the two sets of angle members 2a and 2b are previously installed in the shells S1 and S2 as shown in FIG. A plurality of (16 in this example) welds are made at equal intervals in the vicinity of the ends of the. Then, the end of the shell S2 suspended by a crane or the like is brought closer to the end of the shell S1 that is already fixed, and the shells S1 and S2 are
The worker inside the shells S1 and S2
The first nut 4 of the jig 1 which is arranged at each location
Insert bolts 5 between them to connect them in sequence. Next,
A second washer 6 and a second nut 7 are attached to the ends of the bolt 5 inside the shells S1 and S2,
By tightening the second nut 7, the shell S1
And the end of the shell S2 are pulled together. After performing the temporary assembly as described above, the shell S1
Of the jig S and the end of the shell S2 are welded together, and finally the jig 1
Melt and remove.

[0006]

However, since the shells S1 and S2 are heavy ones having a diameter of about 4 m and a length of several meters, the shells S1 and S2 are temporarily assembled by the jig 1 as described above. When doing so, a large load is applied to the bolt 5 for pulling the shells S1 and S2. Therefore, such pulling work requires careful and heavy labor and takes a long time.

Further, in order to reduce the weight that each bolt 5 bears, it is necessary to arrange a large number of jigs 1 in the shell at equal intervals. Therefore, as shown in FIG. Since a large number of jigs 1 are also attached to the upper part), it is necessary to install a large-scale scaffold in the shells S1 and S2, and of course, dismantling work is required. It took a long time to perform the preparatory work such as the work, the installation work of a large number of jigs 1 for the shell and the removal work thereof, and the post-work.

The present invention has been made in view of the above circumstances, and provides a shell temporary assembly method suitable for welding the ends of shells forming a rotary kiln and an apparatus therefor. With the goal.

[0009]

According to the temporary assembly method of the present invention, when the ends of the shells forming the rotary kiln are welded to each other, the ends of both shells are arranged to face each other at a predetermined interval in the axial direction. In addition, by arranging a plurality of jacks at equal intervals in the circumferential direction between the end portions of the two shells, the respective jacks are actuated to draw the two shells toward each other and bring the end portions of the two shells into contact with each other. It is characterized by temporarily assembling in a closed state. In this case, the plurality of jacks are simultaneously operated in synchronization with each other, and the actual operation amount of each jack is detected and feedback control is performed so that the operation amount of each jack is constant, and both shells are mutually operated. It is preferable to draw it.

The temporary assembling apparatus of the present invention includes a first support fixed to the inner surface of one shell near the end and a second support fixed to the inner surface of the other shell near the end. Body and
The first, which is installed between the first and second supports,
And a jack that draws both shells together via a second support. In this case, the first support member includes a first contact plate fixed to an inner surface near one end of one shell in a direction orthogonal to the axial direction of the shell, and the first contact plate. The second support is formed of a first support plate that supports a plate, and the second support has a mounting portion fixed to the inner surface near the end portion of the other shell, and a base end connected to the tip of the mounting portion. An arm portion extending from the other shell end portion into the one shell beyond the first abutment plate, and an abutting portion connected to a tip end of the arm portion and extending toward an inner surface of the one shell portion. And the corresponding contact portion is formed of a second contact plate facing the first contact plate and a second support plate supporting the second contact plate. It is preferable that the jack is arranged so as to widen the gap between the first and second contact plates.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a diagram showing a temporary assembling apparatus 21 of the present embodiment, and FIG. 2 is a diagram showing a state in which a temporary assembling operation is performed using a plurality of (four in the present embodiment) temporary assembling apparatuses 21. .

As shown in FIG. 1A, the temporary assembling apparatus 21 of the present embodiment has a first support 31 and a second support 41.
And a jack 51. The first support 31 is formed of a channel material having a U-shaped cross section, and a web portion of the channel material is provided on the inner surface near the end of one shell S1 in the axial direction of the shell S1. Fixed in orthogonal directions to form a first abutment plate 32,
The flange portion forms a first support plate 33 that supports the first contact plate 32. Further, a reinforcing member 34 is arranged between both flange portions of the web portion of the channel material. The end surfaces of the channel material and the reinforcing material 34 are welded to the inner surface of the shell S1.

The second support 41 is also formed of a channel material having a U-shaped cross section, and has a mounting portion 42 fixed to the inner surface near the end of the other shell S2 and a mounting portion having a base end. 42 connected to the tip of the shell S2 and extending from the end of the shell S2 into the shell S1 beyond the first abutment plate 32 of the first support body 31, and the shell S2 connected to the tip of the arm 43. And an abutting portion 44 that hangs in the direction of the inner surface.

The mounting portion 42 is fixed such that the web portion of the channel material is oriented orthogonal to the axial direction of the shell S2 and the flange portion is located inside the shell S2. Further, the tip end portion of the channel material forming the attachment portion 42, both ends of the channel material forming the arm portion 43, and the arm portion 43 of the channel material forming the contact portion 44 are connected. The end portion on the side is obliquely cut at an angle of 45 degrees so that the protruding end side of the flange portion is longer than the base end side connecting to the web portion.
And the connecting portion between the arm portion 43, and the arm portion 43 and the contact portion 44
The connecting portion is configured such that the web portion and the flange portion of the channel material forming each of them are connected by welding. The base end of the mounting portion 42 is welded to the inner surface of the shell S2.

The channel forming the contact portion 44 is formed by connecting the contact portion 44 as described above via the arm portion 43 to the mounting portion 42 fixed in the shell S2 as described above. The web portion of the material forms a second contact plate 45 facing the first contact plate 32 forming the first support 31, and the flange portion supports the second contact plate 45. The second support plate 46 is formed.

The web portion of the channel material forming each of the mounting portion 42, the arm portion 43, and the abutting portion 44 constituting the second support body 41 has a flange at the center between both flange portions. Reinforcing materials 47, 48, 49 of the same type as the part are attached, and the attachment part 42 is reinforced at the connection part between the attachment part 42 and the arm part 43 and the connection part between the arm part 43 and the contact part 44. A material 47 and a reinforcing material 48 for the arm 43, and
The reinforcement member 48 of the arm portion 43 and the reinforcement member 49 of the contact portion 44 are
Each is connected.

Further, the jack 51 includes the first support 31.
The first abutting plate 32 and the second abutting plate 45 of the abutting portion 44 constituting the second supporting body 41 are disposed so as to be interposed therebetween. Then, as shown in FIG.
The one jack 51 is connected to the operation portion 52, and the operation of each jack 51 is controlled by the operation portion 52.

The work of temporarily assembling the two shells S1 and S2 to be welded by using the temporary assembling device 21 having the above structure will be described.

First, the first support body 31 and the second support body 41 are respectively provided in advance in the vicinity of the ends of the shells S1 and S2 at predetermined intervals (in this example, etc.), as shown in FIG. Weld it and fix it at four points at intervals.

Then, with respect to the first support 31 fixed to the shell S1, the second support 41 fixed near the end of the shell S2 is displaced in the circumferential direction, and is already fixed. The shell S2 suspended by a crane or the like is brought into contact with the end portion of the shell S1 that is open. Then shell S2
By rotating about the central axis, the circumferential position of the first support 31 included in the shell S1 and the shell S2
To match the circumferential position of the second support body 41, and the first contact plate 32 of the first support body 31 and the second contact plate 45 of the second support body 41. Face each other.

Next, the jack 51 is arranged between the first contact plate 32 and the second contact plate 45, and the operating portion 52 of the jack 51 is operated, whereby the four jacks 51 are connected.
Are simultaneously operated in synchronization with each other, and the first contact plate 32 and the second contact plate 45 are pressed and separated from each other. By this operation,
The first support 31 provided with the first contact plate 32 and the attachment portion 42 connected to the contact portion 44 provided with the first contact plate 32 via the arm portion 43 approach, that is, The ends of the shell S1 to be welded and the ends of the shell S2 are pulled together to temporarily assemble them. At this time, each jack 5
It is preferable to provide an appropriate sensor for detecting the operation amount of itself and feedback control the operation amount of each jack 51 by the operation unit 52 to be constant according to the detected value. By doing so, both shells S1 and S2 can always be maintained in the coaxial state, and more accurate temporary assembly can be performed.

The shell S in the state where it is temporarily assembled as described above
After the end portion of 1 and the end portion of the shell S2 are welded, the jack 51 is retracted and removed, and the first support body 31 and the second support body 41 are fused and removed.

As described above, according to the temporary assembling apparatus 21 of the present invention, the jack 51 pulls the ends of the shells S1 and S2, so that the bolt 5 shown in FIG. It is possible to perform the temporary assembling work much more easily than the case where the jig 1 is used. In particular, since the jack 51 that can obtain a large pulling force is used, the required number of the jacks can be greatly reduced compared to the case where the conventional jig 1 is used. It is sufficient to use the temporary assembly device 21. Therefore, it is possible to reduce large-scale temporary scaffold installation work and dismantling work, which are indispensable in the conventional case where a large number of jigs 1 are used, and to significantly reduce high-place work performed using the scaffold. As a result, it is possible to sufficiently save labor and speed up the welding work of the shells S1 and S2.

In the above embodiment, the temporary assembly device 2
The case where the first support body 31 constituting 1 is arranged in the existing shell S1 and the second support body 41 is arranged in the shell S2 newly attached to the shell S1 has been described as an example. Even if the arrangement is reversed and the second support body 41 is arranged in the existing shell S1 and the first support body 31 is arranged in the newly attached shell S2, the same effect is obtained.

In this embodiment, four temporary assembling devices 21 are used. However, the number of the temporary assembling devices 21 is arbitrary as long as it is two or more, and the required number of units is taken into consideration in consideration of the diameter and weight of the shells S1, S2. Should be set optimally. When the temporary assembling devices 21 are arranged at, for example, two positions in the circumferential direction of the shells S1 and S2, the temporary assembling devices 21 are arranged at the opposite positions on the diameter of the shells S1 and S2. It goes without saying that it is most rational to arrange 21 at equal intervals in the circumferential direction of the shells S1 and S2.

Further, in the above embodiment, the jack 51 is arranged between the first contact plate 32 and the second contact plate 45, and the first contact plate 32 and the second contact plate 32 are arranged. The structure in which the shell S1 and the shell S2 are drawn together by pushing the gap between the contact plate 45 and the jack 51 apart,
The temporary assembling apparatus of the present invention is not limited to this. For example, the second support 32 provided on the shell S2 may also be the shell S2.
The first support 31 provided on the first support 1 may have the same configuration, and a jack arranged between the two supports may draw both supports directly toward each other.

[0027]

As described above, according to the temporary assembling method of the present invention, the shells are attracted to each other by using the jack, so that the temporary assembling work is much easier and easier than the conventional jig. In addition to being able to perform quickly, each jack in each temporary assembling device can secure a large pulling force, so the required number of this temporary assembling device can be significantly reduced compared to the case where a conventional jig is used. As a result, not only can the work of installing the temporary assembly device and the work of disassembling it be significantly reduced, but also the omission of scaffolding and the work of high places can be realized by reducing the installation work for high places,
Significant labor savings in shell welding work and improved work efficiency can be achieved. In particular, by performing feedback control so that the operation amount of each jack is constant, the shells can be kept coaxial with each other and highly accurate temporary assembly can be performed.

Further, since the temporary assembling apparatus of the present invention comprises the first and second supports fixed to both shells and the jack interposed between them, the simple assembly has a large pulling force. It is suitable for use when the obtained method is carried out.

[Brief description of the drawings]

1A and 1B show a temporary assembling apparatus according to an embodiment of the present invention, in which FIG. 1A is a front view and FIG. 1B is a left side view showing a first support.

FIG. 2 is a diagram showing a state in which a temporary assembling work is being performed using the temporary assembling apparatus.

3A and 3B are views showing a jig used in a conventional temporary assembly, in which FIG. 3A is a front view and FIG. 3B is a side view.

FIG. 4 is a cross-sectional view showing an arrangement situation of the jig.

FIG. 5 is a front view showing a rotary kiln.

[Explanation of symbols]

 K rotary kiln S1 shell S2 shell 21 temporary assembly device 31 first support body 32 first contact plate 33 first support plate 41 second support body 42 mounting portion 43 arm portion 44 contact portion 45 second Contact plate 46 Second support plate 51 Jack

Claims (4)

[Claims] 1. When welding end portions of shells forming a rotary kiln, the end portions of both shells are axially opposed to each other at a predetermined interval, and a plurality of end portions are provided between the end portions. The rotary is characterized in that the jacks are arranged at equal intervals in the circumferential direction, and the respective jacks are actuated to draw the two shells closer to each other so that the ends of the two shells are temporarily assembled to each other. Kiln shell temporary assembly method. 2. The method for temporarily assembling a shell of a rotary kiln according to claim 1, wherein the plurality of jacks are simultaneously operated in synchronization with each other, and the actual operation amount of each jack is detected. A method for temporarily assembling shells in a rotary kiln, wherein both shells are pulled toward each other while feedback control is performed so that the operation amount becomes constant. 3. A shell temporary assembly device for a rotary kiln, which is applied when the temporary assembly method according to claim 1 or 2 is carried out, wherein the first shell is fixed to an inner surface near one end of one shell. The support, the second support fixed to the inner surface near the end of the other shell, the first and the second support installed between the first and second supports,
A shell temporary assembling device for a rotary kiln, comprising: a jack that draws both shells through a second support. 4. The shell temporary assembly device for a rotary kiln according to claim 3, wherein the first support member is provided on an inner surface near one end of one shell in a direction orthogonal to the axial direction of the shell. Is formed from a first contact plate fixed to the first contact plate and a first support plate supporting the first contact plate, and the second support is provided on the inner surface near the end of the other shell. An attachment portion to be fixed, an arm portion having a base end connected to a tip end of the attachment portion and extending from the other shell end portion into the one shell beyond the first contact plate, and the arm. And a second contact plate facing the first contact plate, the contact part being formed of an abutting part connected to the tip of the part and hanging down in the inner surface direction of the one shell. And a second support plate that supports a second contact plate, wherein the jack spreads a gap between the first and second contact plates. The temporary assembly device for the shell of the rotary kiln, which is characterized by being arranged as follows.