Tool and method for removing slot wedge

Abstract

The invention relates to a tool (1) for removing a slot wedge (10) from a slot (5) of a stator (4) of a generator, the tool (1) having at least: a hollow piston cylinder (20), a pull rod (23) connected to the hollow piston cylinder (20), a tool slide (26) fastened to the pull rod (23), a fastening unit (30) and a support (31, 33) for bearing on the stator (4).

Description

Technical Field

[0001] The invention relates to a tool for removing a slot wedge and a method for removing a slot wedge. Background Art

[0002] Slot wedges in generator stators are typically removed by machining. This process can contaminate the stator. Alternatively, the slot wedges are removed manually using hammers, chisels, or other extractors. However, this is not always feasible due to the significant force required.

[0003] Document US20060026818 A1 shows a tool for removing slot wedges, but the tool is too large. Summary of the Invention

[0004] Therefore, an object of the present invention is to solve the above-mentioned problems.

[0005] This object is achieved by a tool according to claim 1 and a method according to claim 4 .

[0006] Further advantageous measures are listed in the dependent claims, which can be combined with one another as required to achieve further advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The accompanying drawings show:

[0008] Figure 1 A top view of a portion of a stator of a generator with the tool is shown;

[0009] Figure 2 Shown Figure 1 sectional view of . DETAILED DESCRIPTION

[0010] The description and drawings merely illustrate embodiments of the present invention.

[0011] In order to avoid the above-mentioned problems, the present invention proposes a hydraulic tool, which can be used to push the slot wedge out of the slot in the axial direction.

[0012] Figure 1 The tool 1 is shown in a top view, arranged on a stator 4 of a generator. The stator 4 has a lamination stack 7, between which slot wedges 10 are located in slots 5. The lamination stack 7 also has ventilation slots 8 transverse to the slots 5.

[0013] The slot wedge 10 should be able to be removed easily and safely.

[0014] The tool 1 comprises at least one cylinder, in particular a hollow piston cylinder 20 , a drawbar 23 , a tool slide 26 , a fastening unit 30 and supports 31 , 33 .

[0015] The tool slide 26 is sunk into the slot 5 or placed at the end of the slot wedge 10. The tool slide 26 is guided in the slot 5. At the end of the slot wedge 10, the tool slide presses against the slot wedge 10. The applied force pushes the slot wedge 10 axially out of the slot 5. The force transmission from the hollow piston cylinder 20 to the tool slide 26 is accomplished by the tie rod 23 extending through the hollow piston cylinder 20.

[0016] The force transmission from the hollow piston cylinder 20 to the laminated core 7 is accomplished by the fixing unit 30 .

[0017] A pusher 37 is provided on the fixing unit 30, which can be pushed into the ventilation gap 8 to transmit force. The pusher 37 is preferably arranged on the left and right sides of the hollow piston cylinder 20. It is preferably arranged at one end of the piston 20 that is engaged with the pull rod 23.

[0018] The tool 1 is supported on the hollow piston cylinder 20 , more precisely on the fastening unit 30 , via a front support element 31 and a rear support element 33 , wherein these support elements are plate-shaped in accordance with the curvature of the stator 4 .

[0019] A clamping wedge 43 is provided on the supports 31 , 33 , which is guided in the unfilled groove 5 and can be fixed by means of a quick-release clamp.

[0020] Furthermore, a transverse force support 40 is provided on the rear support, which on the one hand absorbs the transverse forces and on the other hand guides the tool 1 in the groove 5 when the tool 1 is pushed.

[0021] If the removal of the slot wedge 10 starts from the lowest position, then the transverse force support 40 is not yet necessary or not necessary during initial use, because the tool rests on the stator due to gravity. Subsequently, the slot wedge 10 in a slot is removed so that this slot can be used to support transverse forces.

[0022] This device allows the slot wedges to be removed without contaminating the stator during removal. Furthermore, damage is less likely to occur. The resulting loads are transferred directly to the lamination stack, thus relieving the operator of the strain. This makes it more cost-effective and ergonomic from a safety perspective.

Claims

1. A tool (1) for removing a slot wedge (10) from a slot (5) of a stator (4) of a generator, wherein: The tool (1) has at least: Hollow piston cylinder (20); a pull rod (23) connected to the hollow piston cylinder (20); a tool slider (26) fixed on the pull rod (23); a fixing unit (30); and Support members (31, 33) for supporting on a stator (4).

2. The tool according to claim 1, wherein The tool has a pusher (37) which is pushed into a ventilation gap (8) of a lamination stack (7) of the generator in order to transmit force.

3. The tool according to claim 1, wherein The support elements (31, 33) have clamping wedges (43) and / or transverse force supports (40) for engaging in the grooves (5).

4. A method for removing a slot wedge (10) from a slot (5) of a stator (4) of a generator, wherein: Use of a tool (1) according to claim 1.

5. The method according to claim 4, wherein First remove the slot wedge (10) at the lowest point.

6. The method according to claim 5, wherein: The transverse force support (40) is inserted into the unfilled groove (5).

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