JPH05192598A - Rotor for shock or hammer mill and method for its manufacture - Google Patents

Abstract

PURPOSE: To surely and inexpensively weld a rotor assembled by welding from plural rotor disks. CONSTITUTION: Recesses 17 formed at the end face of a boss 3 for an annular weld seam 9 extend from their outer ridges to the substantial portions of the thickness in the radial direction of the boss 3. The weld seam grooves 16 formed by the recesses 17 of the adjacent rotor disks 1 are filled with weld material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a plurality of rotor discs made of cast steel welded to each other, the rotor discs having wide bosses in contact with each other, the rotor discs being bossed by an annular weld seam. The invention relates to a rotor for an impact mill or a hammer mill which is welded in and a method for manufacturing the same.

[0002]

In the case of known rotors of this type, the rotor disks are welded to each other in their outer regions in order to give the rotor body sufficient rigidity (German Utility Model Registration No. 1831058 and German Utility Model). Japanese Patent Registration No. 6601200). However, in the case of hammer mills, there is only a small area between the spaces required for an impact hammer and therefore the weld seam is interrupted. This is also true for impact mill rotors welded in this way, but the weld seams of the impact mill rotor are long and complex. Therefore, manufacturing such a rotor is costly. Moreover, the outer region of the rotor is very susceptible to wear and therefore the weld seams there are also subject to damage.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a rotor and a method of manufacturing the same which can reliably and inexpensively weld a rotor assembled from a plurality of rotor disks by welding.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a rotor, in which a cutout portion provided on an end surface of a boss for an annular weld seam extends from an outer edge of the boss in a radial direction of the boss. It is characterized in that it extends over a considerable portion of the thickness and that the weld seam groove formed by the cutouts of the adjacent rotor disks is filled with welding material. The inner end of the boss of the rotor disc provided with the axial boss is provided with a tubular recess that fits exactly, the ring disc that fits into the recess, and, in some cases, is inserted into the ring disc. , The rotor discs are arranged side by side with each other in an aligned state, and are rotated around the ring disc in the circumferential direction to be aligned with each other. For temporarily connecting the rotor discs to each other by welding points, from the outside to the bottom of the groove formed by the cutout, or from the inside at a position accessible to the edge of the ring disc, If not, insert the tube into the ring disc so that it projects from both ends of the unit consisting of the rotor discs that are temporarily connected to each other, On the two roller pairs of the welding device together with the ends of the welding device, and by means of the drive device provided in the welding device, in the welder or welding seam groove reaching the boss between the rotor discs. It is characterized by slowly rotating the welding machine intruding into the bottom of the welding machine.

In forming the annular weld seam, it is particularly advantageous if the rotor discs are butted against each other by their bosses, if the rotor discs are spaced to some extent in their outer zones. This allows the welder to reach the boss from the surroundings. That is, the rotor disc can be welded very easily and quickly. in this case,
The rotor discs are temporarily fixed or connected to each other in an aligned state and rotated about their common axis.
All annular weld seams can then be formed simultaneously by a stationary welder reaching the boss between the rotor disks. On the other hand, the weld seams required in the known welded rotors can only be formed using hand-guided welders.

In the case of the rotor known from DE 3317070, the annular rotor disk is welded by its inner edge to the drum used as the shaft. However, two weld seams must be formed for each ring disc,
On the other hand, in the rotor configuration according to the present invention, the annular welded seams of two adjacent rotor disks may be connected to each other. At that time, a stable rotor body is produced. For example, the rotor body does not need to be guided on the shaft over its entire length, but only the both ends may be supported by the shaft. Therefore, accurate rotation of the rotor discs is only required on a portion of the rotor discs at each end.

In the case of a rotor of an impact mill in which a plurality of rotor disks arranged at intervals are combined,
In order to support the impact plate mounted on the edge part of the rotor disk, a support girder is generally provided at the rear side of the edge part in the circumferential direction and extends over the entire width of the rotor (German Patent No. 1257541).

If the rotor disks are connected to each other by means of weld seams, the weld beads provided on the outer edges of the end faces of the boss, such as those used in large rotors such as those used in coarse crushers, are It is not necessary to have the required strength with respect to the impact and collision stresses that occur during the operation of the crusher.

It is therefore advantageous if the cutout provided on the end face of the boss for the weld seam extends from the outer edge over a considerable part of the radial thickness of the boss and is filled with the welding material. Yes, and in some cases this may be necessary.

The formation of the weld seam, which in some cases has a considerable thickness, can be carried out in various ways.
The most advantageous method is to form the weld seam from multiple overlapping layers. For this reason, the stationary welding machines are arranged such that the rotor disks, which are aligned with each other, aligned with each other in the circumferential direction, and fixed with each other in the thrust position in the horizontal direction, reach the boss or reach between the cutout portions. Slowly and slowly, so that a weld seam is formed sequentially from the bottom of the groove formed by the two cutouts until the groove is filled with the welding material. This step, as already mentioned, can be carried out simultaneously in all the grooves of one rotor if there are a number of welders corresponding to the number of grooves.
If the welder is equipped with an automatic welding wire feeder and the rotor is automatically returned by a distance corresponding to the thickness of the weld layer each time the rotor makes one revolution, the number of weld beads in the large rotor will be Even when the length of the weld seam formed in each groove is about 100 meters, it is possible to form the weld seam with the minimum work force and time.

In selecting the depth of the groove, an annular rib with a suitable end face remains on the boss so that the annular rib joins adjacent bosses when simultaneously fixing a plurality of rotor disks. It goes without saying that you have to

These ribs can possibly be eluted during the welding process so that the bosses can be welded together over the entire end face if the ribs are provided near the inner edge of the end face. ..

The rotor discs must be accurately aligned with each other when they are fixed simultaneously, but they must also be aligned with each other in the circumferential direction in order to align the edge portions provided on the rotor discs with each other. The rotor discs are fixed in a horizontal position at the same time after installation,
On the other hand, welding must be performed with the rotor disk vertically arranged, that is, with the rotor axis set horizontally.
Multiple rotor disks that are fixed simultaneously must be moved from one position to another. If a plurality of rotor disks are fixed at the same time in the axial direction, it is impossible to reliably prevent the rotor disks from being displaced from each other. , Claim 2.

The centering of the rotor discs with the ring discs can be done in various ways. For example,
Insert a ring disc into all of the tubular cutouts of the boss and attach the rotor disc with the ring disc to the pipe that is also used to carry the unit of rotor discs that are temporarily connected to each other. it can.

By the way, the size of the cylindrical take-out portion and the width of the ring disc allow the ring discs to be engaged with the take-out portions of two adjacent rotor disks, whereby the ring discs are directly connected to each other. Can be selected so that In this case, the rotor discs are joined together via one ring disc and are then aligned with each other by rotating them circumferentially around the ring discs.

Not only can the bosses of the rotor disks be connected to each other from the outside, but they can also be connected to each other from the inside by means of a simple annular weld seam, that is to say by an annular weld seam consisting of a few layers. Is. For this purpose, the boss has, in addition to the tubular cutout, a small cutout provided inside the annular rib.

In order to form the weld seam, according to step c) of claim 2, the rotor discs are connected to each other by a welding point provided at the bottom of the weld seam groove and then the ring discs are moved away from each other. In this case the inner ring disc must be destroyed. Next, an annular weld seam is manually formed. After that, the two outer ring discs, which are preferably chosen to be stronger than the inner ring disc, are inserted again into the two outer rotor discs. Next, steps d) and e) of claim 2 are performed.

Due to the heavy weight of the rotor discs connected to each other, and thus the high affixed hot boric acid, the rotor discs are preheated, for example in a preheating furnace, before they are temporarily joined, and finally Rotor disks are all 125 to 250 ° C before forming weld seams.
It is advantageous to preheat to this high temperature and to maintain this high temperature during the welding process. This can be done using a flame tube.

[0019]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

The illustrated rotors each have a plurality of rotor disks 1 made of cast steel. The rotor disk 1 comprises a central cylindrical hole 2 and a wider boss 3 surrounding it. The rotor disk 1 has a wide support 6 or 7 at its outer edge depending on the type of crushing tool (impact hammer 4, impact plate 5) provided on the rotor disc 1. The support 6 or 7 is shown in FIGS.
In the case of the embodiment illustrated up to now, the adjacent rotor disks 1
A gap 8 is formed between the supports 6 or 7.

The bosses 3 of adjacent rotor disks 1 are connected to each other at their outer edges by an annular weld seam 9. To form this annular weld seam 9, the rotor discs 1, which are centered and fixed to each other by mounting pins 10 at the boss 3, are slowly rotated. In this case, the stationary welder reaching the boss 3 through the gap 8 produces an annular weld seam 9.

In the case of the hammer mill rotor shown in FIGS. 1 and 2, after the annular weld seam 9 has been formed, the impact hammer 4 is held between the rotor disks 1 and its shaft 11 of the rotor for final assembly. The support body 6 is inserted from the end face side into a housing hole that penetrates the support body 6. On the other hand, in the case of the impact mill rotor shown in FIGS.
2 and is pressed against the support 7 by the wedge 13 and the pressing element 14.

As can be seen from FIGS. 5 to 8, rotors of different widths can be formed from rotor disks of different boss widths, which results in the production of subdivided rotors with a simple supporting and holding structure. is there.

It is also possible to provide only two rotor disks 1, as shown in FIGS. 9 and 10. In some cases, a boss ring 3'may be interposed. In this case, in the modification, the support beam 15 is fixed to the disc edge 1 ′ of the rotor disc 1 by welding. Therefore, the support beam 15
Are attached after the rotor boss body is welded first. Thus, perimeter welding is also possible (also automatically) for this embodiment, which is provided for the rotor of a small impact mill.

In the rotor 11 shown in FIG. 11, in order to make the weld seam 9 large, the rotor disk 1 has a cutout portion 17 on the end surface of the boss 3. Retractable part 1
Subsequent to 7, an annular rib 18 is provided. This rib 1
The rotor disks 1 adjacent to each other are in contact with each other by the end faces of 8. When the welding process is completed, the weld seam groove 16
Are filled with the welding material forming the weld seam 9.

The auxiliary means required for welding the rotor discs 1 to each other will now be described in connection with the description of the working steps.

The rotor disks 1 are centered (centered) so that their annular ribs 18 are in contact with each other, and are positioned so as to face each other in the circumferential direction. Alignment is
This is performed using the ring disks 20 and 21 inserted in the tubular drawing-out portion 22 of the boss 3 and the tube 23. Tube 23
The rotor disc 1 is slidably mounted together with the ring discs 20 and 21, and the rotor discs 1 are aligned on each other by being rotated in the circumferential direction on the tube 23, and as a result, the rotor disc 1 is provided on the rotor disc 1. The edge portions 12 provided are aligned with each other. next,
The tube 23 is connected to the outer rotor disk 1 via the turning plate 24 so as not to rotate relative to the outer rotor disk 1. In this state, the rotor disks 1 are temporarily connected to each other by the welding points 25 provided on the bottom of the welding seam groove 16. Depending on the case, after the rotor disc 1 is temporarily connected by the welding point 25 and the pipe 23 and the ring discs 20, 21 are taken out (in this case, the inner ring disc 21 must be broken), the annular rib 18 An annular weld seam 26 may be provided at the inner butt seam of the inner boss 3. Tube 23
The two outer ring discs 20 can be reattached and then reinserted into these ring discs 20. Such a situation is shown in FIG. The ring disk 21 is shown in broken lines in FIG. 11 because it has already been separated at this working stage.

The purposeful modification of the above-mentioned working process is to perform centering and circumferential orientation, so that the ring disk 2
The width of 1 is obtained by selecting such a size that the ring disk 21 engages with the cutout portions of two adjacent rotor disks. After centering and circumferential alignment in this way, the rotor discs are temporarily joined from the inside by welding points in the region of the edge portion of the rotor disc provided for this purpose. After separating the ring disc 21, the annular weld seam 2
6 is formed at the butt seam inside the boss 3. The tube 23 is then inserted into the outer ring disc that was attached to this tube.

Next, the rotor disks 1 connected to each other are rotated together with the pipe 23 to the thrust position in the horizontal direction, and are brought onto the welding device. The welding device has a pedestal 27, and the pedestal 27 includes two roller pairs 28. Mounted on the roller pair 28 is the end of the tube 23 projecting beyond the rotor disk 1. The roller pair 28 can be driven. A bracket 29 fixed to the pedestal 27 extends beyond the unit consisting of the rotor discs 1 on the pedestal 27 and temporarily connected to each other. A plurality of welding machines 30 are arranged on the bracket 29. Each of these welding machines 30 has a supply pipe for supplying a welding wire, a supply pipe for supplying a welding powder, and a suction pipe for sucking out the overflowing welding powder, and the welding pipes of adjacent rotor disks 1 are provided. It extends through an annular gap 8 between the outer crowns 7 to a weld seam groove 16 between the bosses 3 of the rotor disc 1. Depending on the case, it may invade this welding seam groove 16. Its penetration depth is adjustable.

During the welding process, the unit consisting of the rotor disc 1 is slowly rotated. In this case, the welding seam groove 16 is filled with the welding material in such a manner that a plurality of or a large number of welding layers are sequentially stacked in a zigzag manner from the bottom thereof. In this case, the welding machine 30 is sequentially lifted appropriately.

After the welding is completed, the pipe 23 and the ring disk 20 are
And 21 are separated from the rotor body thus formed, and the rotor body is fitted with other members such as shafts and impact plates.

Next, embodiments of the present invention will be listed.

(1) A rotor characterized in that the weld seam (9) is composed of a plurality of layers of welded material.

(2) After performing step c), the ring discs (20, 21) are separated from each other to form an annular weld seam (26) from the inside at the abutting position of the adjacent bosses (3), and then the outside. Manufacturing method, characterized in that the two ring disks (20) are reinserted.

(3) Before the rotor disc (1) is temporarily connected, the rotor disc is preheated to a temperature of 125 to 250 ° C. in a preheating furnace according to the material composition of the rotor disc, and the rotor disc is composed. A manufacturing method, characterized in that the unit is preheated to said temperature by means of a flame tube or the like before forming the weld seam (9) or maintained at this temperature during the welding process.

[0036]

According to the present invention, a rotor assembled from a plurality of rotor disks by welding can be reliably and inexpensively welded.

[Brief description of drawings]

1 is a cross-sectional view of a rotor of a hammer mill according to the present invention.

FIG. 2 is a vertical sectional view of a rotor of a hammer mill according to the present invention.

FIG. 3 is a cross-sectional view of a rotor of an impact mill according to the present invention.

FIG. 4 is a vertical sectional view of a rotor of an impact mill according to the present invention.

FIG. 5 is a reduced view of one embodiment of the width of the impact mill rotor.

FIG. 6 is a reduced view of a modified embodiment of the width of the impact mill rotor.

FIG. 7 is a reduced view of a modified embodiment of the width of the impact mill rotor.

FIG. 8 is a reduced view of a variant embodiment of the width of the impact mill rotor.

FIG. 9 is a cross-sectional view of a rotor for a compact impact mill according to the present invention.

FIG. 10 is a longitudinal sectional view of a rotor for a compact impact mill according to the present invention.

FIG. 11 is a longitudinal section of a modification of the rotor of FIG. 4, which is provided with another pre-welded portion and means for aligning and orienting the rotor disks with each other on the platform of the welding device. It is a figure.

[Explanation of symbols]

 1 Rotor Disc 3 Boss 7 Outer Rim 9 Weld Seam 16 Weld Seam Groove 17 Cutout 20, 21 Ring Disc 22 Cylindrical Cutout 23 Pipe 25 Welding Point 30 Welder

Claims (2)

[Claims] 1. A plurality of rotor discs made of cast steel welded to each other, the rotor discs having wide bosses in contact with each other, the rotor discs (1) being bossed by an annular weld seam (9). In a rotor for an impact mill or a hammer mill being welded in (3), a cutout (17) provided on the end face of the boss (3) for the annular weld seam (9) has a boss from its outer edge. (3)
Over a substantial portion of its radial thickness, the weld seam groove (16) formed by the cutouts (17) of the adjacent rotor discs (1) being filled with welding material, For impact mills or hammer mills. 2. A method for manufacturing a rotor for an impact mill or a hammer mill according to claim 1, wherein the rotor disk (1) is provided with: a) a drawing-out portion (17).
The axial end of the boss (3) is provided with a tubular cutout (22) that fits exactly from the inside, b) a ring disc (2) fitted into the cutout (22)
0,21) and, in some cases, a ring disc (2
0, 21) pipes (23) are used to align the rotor discs (1) side-by-side with each other and to rotate them around the ring discs (20, 21) in the circumferential direction to align them. Orienting, c) a cutout (1) provided for the weld seam (9)
From the outside to the bottom of the groove (16) formed by 7) or from the inside at a position accessible to the edge portion of the ring disc (21), the rotor discs (1) are temporarily joined together by welding points (25). D) If the pipes (23) are not inserted, the pipes (23) are arranged so as to project from both ends of the unit consisting of the rotor discs (1) which are temporarily connected to each other. Inserting the pipe (23) into the pipe (20, 21), e) the welding device (27-30) together with the end of the pipe (23) comprising the unit consisting of the rotor disc (1).
Mounted on the two roller pairs (28) of (1) and (2) using the driving device provided in the welding device (27-30),
Slowly rotating below the welder (30) reaching the boss (3) between the rotor discs (1) or the welder (30) entering the weld seam groove (16); And a manufacturing method.