DK156931B - Apparatus for mounting of a rotor axle provided with rotor and its two bearings in a containment body - Google Patents

Description

DK 156931 B

BACKGROUND OF THE INVENTION The invention relates to an apparatus for mounting a rotor shaft and its two bearings within a container body such as the slit tube for a slit pump, a bearing having to be mounted on each side of the rotor.

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US Patent No. 4404483 discloses an apparatus for mounting a rotor shaft and its two bearings within a rotor sleeve. The apparatus consists of an angular holder in which one of the angular legs is provided with a channel for inserting the rotor shaft. Before inserting the shaft, first one bearing is pressed into place on the shaft, after which the other bearing is pushed over the outer end of the shaft. There will now be a bearing on each side of the rotor. Then, a rotor sleeve is pressed over the rotor and bearings (actually the bearings of the bearings), and then 15 rings are pressed over the rotor sleeve which are placed next to the places where the bearing holders are to be fastened to the rotor sleeve. Thereafter, a shrinkage effect is provided in the rotor casing by providing a circular, pulsating magnetic field at said rings which produces such an inward force of action that the rotor casing is clamped to the bearing holders. A disadvantage of this apparatus is that the axes of the two bearings do not become coaxial with such accuracy as is desired for electric motors and pumps, which it is only rarely possible to undergo service inspection (for example, there may be 25 tai about pumps which are placed in hard-to-reach places).

SUMMARY OF THE INVENTION It is an object of the invention to provide an apparatus of the above-mentioned type which enables unprecedented accuracy with respect to the mounting of the two bearing bearings coaxially (very accurate centering).

The apparatus according to the invention is peculiar in that it has a first holding fixture which is formed by a axially slidable on a first sliding arrangement, preferably hydraulically operated expandable mounting mandrel, on which a bearing bearing for the sight first bearing - after this last manually or automatic, possibly via an auxiliary sled has been fast forward to the mounting mandrel - can be attached to a mandrel pin and temporarily

DK 156931 B

2, and that the apparatus has a second stationary holding fixture for holding the container body, which holding fixtures are adjustable to one another in relation to each other, as well as a swivel-equipped 1 Azer assembly which is rotatable, and which are optionally vertically movable relative to the holding fixtures, and which serve for laser welding of said first bearing bearing holder to the container body, the welding being performed over an air gap between these portions, and the apparatus having a third movable holding fixture as after it was applied. bearing bearing provided temporarily and optionally manually attached and retained to the mandrel pin and thereby lying coaxially with the first bearing, can grasp and remove the second bearing from the mounting mandrel and pass it along the latter's axis and down into the container body down the short front of it 15 first bearing down rotor shaft, and later release second bearing after a welding operation in which the 1-axis welding assembly is arranged For example, in order to be able to laser weld this, the bearing holder for the container body is fitted over an air gap between these parts. This makes it possible to mount the bearings of the two bearings coaxially with very high accuracy, with the mounting mandrel acting as a kind of common reference. Although the two bearings {bearing holders) must be secured to the container body, it is in no way the container body that determines the position of the bearings' axes, but the aforementioned mounting mandrel. The mounting of the bearings in the container body is carried out as follows: first, the container body is placed in the second holding fixture in such a way that the open end of the container body faces the mounting mandrel. Then, the first bearing and associated bearing holder are placed on the auxiliary carriage. Then the mounting mandrel is slightly lowered so that it 30 with its lower end engages the first bearing, after which the mounting mandrel with bearing is further lowered into the bottom of the container body. Thereafter, the container body and the first bearing bearing holder are welded to each other by 1-axis welding, as there will be an air gap between the outside of the bearing holder and the inside of the wall of the container body. Then the mounting mandrel is lifted up and away from the first bearing. Then, by means of a separate tool or manually, the rotor shaft with associated rotor is lowered into the container body, the one end of the rotor shaft being pushed down through

DK 156931 B

3 the first bearing, - and a second bearing with associated bearing bracket is then placed (possibly via the auxiliary carriage) under the mounting mandrel, after which the lower end of the latter is moved downwards so that it grips the second bearing. Then, the third holding fixture is moved downwards and sideways to engage and clamp the outside of the second bearing, after which the third retainer fixture is moved to move the second bearing away from the mounting mandrel, bearing it third holding fixture is coaxial with the mounting mandrel. The second bearing is hereby lowered into place on the upper 10 free end of the rotor shaft, and by means of the welding machine's laser pen, the second bearing bearing holder is welded to the container body, the laser assembly having previously been lifted to the level at which this bearing holder is located. After the welding is done, the third holding fixture 15 is lifted vertically from the container body. After the welding assembly has been somewhat removed from the second holding fixture, the latter can be opened and the container body with its two inner bearings plus rotor shaft with rotor removed. The mounting mandrel is the unit which ensures that the two bearings will lie exactly coaxially because the mounting mandrel can only be moved axially along one particular path.

A particularly convenient embodiment of the apparatus according to the invention is characterized in that the Azer welding unit is made up of a movable mounted annular body positioned around the other holding fixture, which annular light pens are radially inward and hollow, each light pen being connected to its light conductor conducting the light. from a common laser, and that the annular body has a rudder system for supplying protective gas 30 to the welding regions of the container body, which rudder system is connected to the hollow light pens.

According to the invention, the light pens may be arranged to cooperate in pairs, whereas the light pens in each pair may be mounted 180 ° mounted one on the other. Hereby, it is obtained that any small deformations at the welding regions arising from the welding heat will be symmetrical to the container body, thereby exerting a very slight influence on the container body. The

DK 156931 B

4 deformations that occur in the welding areas are already very small.

Still, according to the invention, at least 5 pairs of light pens may be provided, thereby increasing the welding efficiency of the apparatus.

In addition, according to the invention at the individual level, three light pens offset 120 ° can be found for each other, which is appropriate if a smaller number of laser welding sites can be fitted.

According to the invention, the second holding fixture may have howls through which the laser light from the pens can penetrate the container body. This allows the laser light to access the container body at the welding areas in a very simple way.

In addition, according to the invention, the movement of the third holding fixture may be provided by being mounted on a cross-sliding arrangement on said ferry sled, and a front jaw in the holding fixture is fixed relative to the cross-sliding arrangement, while a second jaw is provided. the holding fixture is movable with respect to the cross-slide arrangement by means of a pneumatic device. This ensures that the third holding fixture becomes very easily movable, so that it can easily reach and grab the second bearing. Once it has gripped this bearing, it is adjusted so that it can then move coaxially with the mounting mandrel.

According to the invention, an additional tube may be provided for supplying protective gas inside the container body in connection with the annulus stirrer system. This has also proved very effective.

In addition, according to the invention, the laser welding assembly may be adapted to work with a YAG laser or CO2 laser or electron beam welding and one or more protective gases such as argon. The apparatus will thus provide particularly solid and neat welds.

DK 156931 B

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Furthermore, according to the invention, the mounting mandrel can be expandable by hydraulics, which makes it particularly easy to erect the bearings when they are temporarily placed on the lower end of the mounting mandrel.

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Finally, according to the invention, the light pens may be arranged in at least two levels on the Azer welding assembly. This makes the appliance particularly simple, since between the welding operations you can avoid having to adjust the height of the laser welding unit.

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The invention is explained below with reference to the drawing, in which fig. 1 is a perspective view of an embodiment of the apparatus according to the invention, clearly showing the hollow deflection rods and 1 Acer welding assembly, and the cross-sliding arrangement used being indicated rather schematically; 2 a rotor shaft and its two bearings; Fig. 20 in large measure ratio; 3 the first holding fixture designed as a mounting mandrel, since the first bearing holder plus bearing has been attached thereto, as well as the container body in which the mounting mandrel can be lowered; the whole is shown in large measure, fig. 4 the second holding fixture which retains the container body from the outside; the first holding fixture mounting mandrel with the first bearing bracket and bearing fastened down into the container body; moreover, the laser welding assembly mounted around the second holding fixture is clearly visible; all parts are shown in large dimensions; FIG. Fig. 5 shows the third holding fixture in two positions, namely an upper position, in which it is releasing the second bearing holder 35 plus bearing from the first holding fixture (the second bearing holder plus bearing having been temporarily on the first holding fixture), and a lower one. position where the third holding fixture plus the second bearing holder plus bearing is fast down.

DK 156931 B

6 the holder body, said bearing being fast down over the upper end of the rotor shaft with rotor downwardly short in the container body; moreover, the 1aser welding assembly is seen in a raised position; All parts are shown in large dimensions, FIG. 6 shows the sliding arrangement and the cross-sliding arrangement at one post of the apparatus shown in large dimensions, and FIG. 7 and the! of the container body wall as well as a bearing bracket, clearly showing an air gap between these parts and also a welding site; the parts are shown in large dimensions.

The FIG. 1 serves to mount a rotor shaft 3 provided with rotor 2 and its two bearings - a first bearing 5 with associated bearing holder 5a and a second bearing 15 with associated bearing holder 15a - within a container body 6, the parts shown in FIG. . 2. The container body may e.g. be a slit tube for a slit tube pump. The bearings 5 and 15, when mounted in the container body 6, must sit on either side of the rotor 2 and the axes of these bearings must be coaxial with very fine tolerances. By means of the apparatus according to the invention, the bearing holding portions 5a and 15a can be welded to the container body 6 in such a way that the bearings 5 and 15 also become coaxial.

The embodiment of FIG. 1, a gate 10 is provided with two posts 11a and 11b and an overlay 12. In addition to the post 11b there is mounted a sliding arrangement 14, which is vertically slidable, consisting of slides 14a and 14b. On this sliding arrangement (more particularly the sledge 14b), an axially displaceable (vertical) first holding fixture is mounted by means of a gripping piece 14c in the form of an expandable mounting mandrel 17, which is preferably hydraulically operated. The mandrel may have a mandrel pin 19 below, and the mandrel 17 and mandrel 19 may be hollow, as shown by channel 18. Pressure fluid 35 may be fed to the channel 18, and when the fluid is pressurized, the mandrel will expand some 100 parts of the mandrel. a millimeter, which is sufficient to create the first bearing 5 with associated bearing holder 5a, if the bearing 5 has been slightly skewed on the mandrel 19.

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As shown in FIG. 4, the apparatus further has a second holding fixture 22 in the form of two jaws which can be pushed in and out from one another and which serve to hold the container body 6 between them. These retaining jaws are provided with transverse holes, then guided as shown at 25a, 25b, 25c and 25d, whereby laser light can pass through the retaining jaws into the retaining body.

On a swing arm mounted on the post lia, which is not shown, however, an up and down movable, as well as rotatable 1-axis welding assembly is mounted on its axis 10, and as e.g. can be formed by an annular body 27, which sits around the second holding fixture 22. The annular body 27 is provided with light pens 29a, 29b, 29c and 29d, which are radially inward and hollow, each light pen being connected to its light conductor 29a ', 29b ', 29c', 29d 'which can direct la-15 light from a common laser not shown. The annular body 27 has a rudder system for supplying protective gas to the hollow light pins 29a, 29b, 29c, 29d so that protective gas can be fed to the welding areas of the container body 6 when it is placed between the jaws of the second holding fixture 22.

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As shown in FIG. 5, the apparatus has a third holding fixture 33, e.g. in the form of two holding jaws 33a, 33b, which serve to grip and retain the second bearing 15 with associated bearing holder 15a, after the bearing 15 has been temporarily and optionally 25 manually pre-mounted and retained for the mandrel pin 19 of the mounting mandrel 17. 33 is further arranged, when the second bearing 15 is gripped and thereby coaxially with the first bearing 5, to remove the second bearing 15 (with associated bearing holder 15a) and guide it along the latter's axis 30 and down the container body 6 descends over the short front end of the first bearing 5, rotating down the rotor shaft 3 and later releasing the bearing 15, after the latter's bearing holder 15a has been welded to the container body 6 by means of the 1-axis welding assembly 27. While the third holding fixture leads the second bearing 15 down 35 in the container body 6, the mounting mandrel 17 will stand still in its uppermost position. One can say that the main task of the third holding fixture is to hold and later move the second bearing 15 (with bearing holder) after the latter has had its axis fixed

DK 156931 B

8, so that this is exactly coaxial with the axis 37 of the rontage mandrel 17, but is also said to hold the bearing 15 (with bearing holes) during the 1-axis welding.

As mentioned, the 1-axis welding assembly 27 is vertically movable.

While in FIG. 4 is in a lower welding position corresponding to the level of holes 25a, 25b, 25c, 25d in the jaws 22, as shown in FIG. 5 is shown in its upper position corresponding to a series of upper welding holes in the jaws 22, of which welding 10 only the holes 45a, 45b are visible in the figure.

In FIG. 6, it is seen how the movement of the three holding fixture is provided by being mounted on a cross-slider arrangement 47, which is itself mounted on the first sliding arrangement 15 14, in particular on its sledge 14b. The cross-sleigh arrangement 47 consists of an upper one! 47a, which is attached to the carriage 14b, a carriage 47b under the portion 47a, and a further carriage 47c under the latter. The first jaw 33a of the holding fixture is fixed with respect to the slider 47c of the cross-slider arrangement, while the second jaw 33b is movable relative to the slider 47c of the cross-slider arrangement by means of a pneumatic device 48. The jaw 33b is seated on a not shown. movable holding carriage slidable under carriage 47c which can be moved back and forth on carriage 47c by means of device 48.

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With regard to the light pens 29a, 29b, 29c, 29d, these are preferably arranged to cooperate in pairs and that the pens in the individual pairs are mounted 180 ° perpendicular to each other, see fig. 4 and 5. Preferably there are at least two pairs of light pens. Optionally, in the single level in which to be welded, three light pens offset 120 ° may be provided for each other. It is also possible that, in connection with the annular body rudder system rudder system 27, there is an additional - not shown - rudder for supplying protective gas to the interior of the container body 6. This rudder can be quickly lowered into the container body from above. 6 cavities.

The laser welding unit may be adapted to work with a YAG laser or a CO 2 laser or electron beam welding and one or more protective gases such as the inert air-argon.

DK 156931 B

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It is also possible to make the annular weld assembly 5 27 of the laser welding assembly relatively high, so that it may contain radially inward light pens at at least two levels. This is also not shown in the figures.

The apparatus operates as follows: 10 When a rotor shaft 3 (rotor rotor 2) and the first bearing 5 (with associated bearing bracket 5a) and the second bearing 15 (with associated bearing bracket 15a) are to be mounted in the container body 6, first, the container body 6 clamps between the jaws of the second 15 ho fixture 22. The first holding fixture mounting mandrel 17 is at this point in an upper position. After manually or automatically, e.g. by means of an auxiliary carriage not shown, the first bearing 5 has fast forward to the mandrel pin 19 and the bearing 5 is mounted on it, while at the same time the bearing holder 5a 20 protrudes horizontally from the bearing 5 (the situation of FIG.

3), hydraulic pressure is applied to the interior of the mandrel 17 so that the bearing 5, if slightly sloped, is aligned so that its main axis with very fine tolerances becomes coaxial with the main axis 37 of the mounting mandrel 17. 17 downwardly along its axis 37, so that the bearing 5 and associated bearing holder 5a occupy a pre-determined desired position near the bottom of the container body 6. Between the outside (which is quite narrow) of the bearing holder 5a and the inside of the bearing - the retaining wall 5 there is a fine air gap all around. This is shown in FIG. 7 indicated by s. Of the pens, the pen pair 29a, 29c is first activated, and when the first activation has occurred, a slight angular displacement of this pair of pens is made. In connection with the light pen 29a, welding is first passed through the hole 25a and then through the hole 25b. Later, a corresponding activation of the light pen pair 29b, 29d is made. The bearing holder 5a is now welded as desired and it will not be skewed because the very fine laser welding points 60 (Fig. 7) have not caused any significant deformations of the container doctor.

DK 156931 B

10, which deformations could have pulled the bearing holder out of the correct position. As can be understood, the laser welds are made over quite small air slots, similar to s in FIG. 7th

5 Then the hydraulic pressure is removed from the duct 18 and the mounting mandrel 17 is raised to its upper position. Then the rotor shaft 3 (with associated rotor 2) is lowered into the container body 6, the lower end of the rotor shaft being pushed down through the bearing 5. Then - either manually or by means of the predetermined auxiliary slide (not shown) - the second bearing 15 ( bearing bearing holder 15a) advances to the lower end of the mounting mandrel 17 and is inserted over the mandrel pin 19, and pressure is placed on the hydraulic fluid in the inner channel of the mounting mandrel 18. The bearing 15 with associated bearing holder 15a is now (within very five tolerances ) coaxially with the first bearing 5 already attached to the container body 6. Thereafter, the jaws 33a and 33b of the third holding fixture are gripped and clamped about the bearing 15 and the bearing holder 15a, the pneumatic member 48 (see FIG.

6) Activated. Then the third holding fixture is guided into the container body by means of the 20 cross-slide arrangement 47, the second bearing 15 being brought down over the upper end of the rotor shaft 3. The bearing 15 with associated bearing holder 15a will now be at the top of the container body 6, cf. 5 and the main axis of the bearing 5 will within coaxial tolerances be coaxial with the previously fixed bearing 5. The annular body 27 of the laser welding assembly is now raised to a position at the level of the holes 45a, 45b in the jaws of the second holding fixture, and between the bearing holding portion 15a and the container body. 6, a narrow air gap s (cf. Fig. 7) is found around the part 15a, then a laser welding is performed over this air gap. First, the pair of light-pen pairs consisting of light-pens 29a, 29c are activated and, if necessary, several welding points are provided adjacent to each other. Thereafter, laser welds are similarly welded by means of the laser pen pair 29b, 29d. Thereafter, the jaw 33b of the third holding fixture is released to release its grip on the bearing holding portion 15a, after which the third holding fixture is raised to its upper position (top of Fig. 5). Then lower the 1-axle weld assembly so that the other holding fixture

Claims (11)

The carriage arrangement 14, the cross seat arrangement 47 and other carriages may be positioned differently than shown. What is crucial is that the farthest, second and third holding fixtures can be positioned correctly in relation to each other. 20 Patent claims. An apparatus for mounting a rotor shaft (2) equipped with a rotor (2) and its two bearings (5, 15) within a container body 25 (6), such as the splitter tube for a splitter pump, a bearing ( 5; 15) on each side of the rotor (2), characterized in that it has a colored holding fixture which is formed by a axially displaceable, preferably hydraulically operated, expandable mounting mandrel (14) (17) on which a colored bearing (5a) fitted with a bearing bracket (5) - after the latter has been driven manually or automatically, possibly via an auxiliary sled, up to the mounting mandrel (17) - can be mounted on a mandrel pin (19) and temporarily retained and the apparatus having another stationary retaining fixture 35 (22) for retaining the retaining body (6), which retaining fixtures (17, 22) are adapted to be adjustable relative to each other, and one with a light pen (29a, 29b, 29c, 29d) equipped with rotatable 1-axis welding assembly (27) and as DK 156931 B 12 eve is practically vertically movable relative to the holding fixtures (17, 22), which serve a 10-axis welding of said first bearing (5) bearing holder (5a) to the container body (6), the welding being carried out over an air gap (s) (FIG. . 7) between these 5 parts, and that the apparatus has a third movable holding fixture (33) which, after the second bearing (15a) bearing (15) has been temporarily and possibly manually fixed and retained to the mandrel pin (19) and thereby lying coaxially with the first bearing (5), being able to grasp and remove the second bearing (15) 10 from the mounting mandrel (17) and pass it along the axis (37) of the latter down into the container body (6) down the short front through it. first bearing down rotor shaft (3) and later releasing second bearing (15) after a welding operation, wherein the laser welding assembly (27) is arranged to also laser-15 weld this bearing (15) bearing holder (15a) to the container body (6) over an air gap (s) between these parts. Apparatus according to claim 1, characterized in that the 1-axis welding assembly is constituted by a movable mounted annular body (27) located around the second holding fixture (22), the annular body (27) of which the light pen (29a, 29b, 29c, 29d) are radially inward and hollow, each light pen being connected to its light conductor (29a1, 29b1, 29c ', 29d') which conducts light from a common laser, and that the annular body has a rudder system for supplying protective gas to the welding areas ( 60) (Fig. 7) on the container body (6), which tube system is connected to the hollow light pens (29a, 29b, 29c, 29d). Apparatus according to claim 1 or 2, characterized in that the light pens (29a, 29b, 29c, 29d) are arranged to cooperate in pairs and that the light pens in each pair (29a, 29b, 29c, 29d) are mounted 180 ° for each other. Apparatus according to claim 1, 2 or 3, characterized in that there are at least two pairs of light pens (29a, 29c; 29b, 29d). Apparatus according to one or more of claims 1-4, characterized in that in each level there are three light pens offset 120 ° for each other. 13 DK 156931 B Apparatus according to one or more of claims 1 to 5, characterized in that the second holding fixture (22) has a holster (25a, 25b, 25c, 25d), through which the laser light from the pens (29a, 29b, 29c, 29d) ) can penetrate into the container body (6). 5 Apparatus according to one or more of claims 1-6, characterized in that the movability of the third holding fixture (33) is provided by being mounted on a cross-slide arrangement (47) on said first carriage ( 14), and a fresh jaw (33a) in the holding fixture (33) is fixed relative to the cross-sliding arrangement (47, 47c), while another jaw (33b) in the holding fixture is movable relative to the cross-sliding arrangement (47, 47c) by means of a pneumatic device (48). 8. Apparatus according to one or more of claims 1-7, characterized in that, in addition to the rudder system (27), an additional rudder is provided for supplying protective gas inside the container body (6). 9. Apparatus according to one or more of claims 1-8, characterized in that the 1-axis welding assembly (27) is designed to work with YAG laser or CO2-laser or electron beam welding and one or more protective gases such as argon. 25 10. Apparatus according to one or more of claims 1-9, characterized in that the mounting mandrel (17) is expandable by means of hydraulics (18). 30 11. Apparatus according to one or more of Claims 1 to 10, characterized in that the light pens (29a, 29b, 29c, 29d) are arranged in at least two levels on the laser welding unit (27). 35