Auxiliary device for disassembling and assembling inner end cover of generator

Abstract

The utility model discloses an auxiliary device for disassembling and assembling an inner end cover of a generator. The auxiliary device comprises a nut tool, a ratchet wrench, a sliding rail, a sliding piece assembled with the sliding rail in a sliding mode and a lifting mechanism installed on the sliding piece. By adopting the dismounting auxiliary device for the inner end cover of the generator, on one hand, the safety risk of accidental injury caused by holding a nut tool by hand is avoided, and on the other hand, the uniformity and reliability of nut fastening torque are ensured, so that a sealing gasket is compacted, and the sealing performance is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to generator dismounting technical field, concretely relates to a generator inner end cover dismounting auxiliary device. BACKGROUND

[0002] The existing thermal power generator cooling mode mainly has air cooling, water cooling, hydrogen cooling. Below 50,000 kilowatt small unit adopts closed air cooling mode. For water cooling, the relative cooling capacity of water is much higher than air, and the required water flow is much smaller than air for taking away the same heat. Therefore, adopting a part of hollow conductor in the coil and passing water in the conductor for cooling can greatly reduce the motor temperature rise, delay insulation aging and increase the motor life. Above 500-600 kilowatt unit widely uses water hydrogen combined cooling mode, namely water internal cooling of stator winding, hydrogen internal cooling of rotor winding and hydrogen cooling of stator core. For hydrogen cooling, the heat dissipation performance of hydrogen (purity 99%) is better than air, the heat dissipation effect is good, the ventilation friction loss of the generator can be greatly reduced, thereby the efficiency of the generator can be significantly improved. The cooling hydrogen treated strictly can ensure the cleanliness of the generator interior, the ventilation and heat dissipation effect is stable, and no accident caused by dirt can occur. The oxygen content in hydrogen is very small, lower than 2%, not combustion-supporting, even if short circuit failure occurs in the generator interior, no danger of fire can occur, thereby the damage degree of the failure can be greatly reduced. In hydrogen, the noise is small, and the insulation material is not easy to be damaged by oxidation and corona. But the hydrogen in the generator must maintain the specified purity to ensure the operation performance of the generator and avoid explosion, so a set of sealing device must be arranged to ensure that the hydrogen in the generator does not leak out, and air does not leak into the generator interior. In the electric power maintenance work, ensuring the tightness of the large end cover and the inner end cover of the sealing tile is the primary condition for the safety of hydrogen cooling. Otherwise, the hydrogen concentration is unqualified, the tightness is poor, which will cause frequent hydrogen replacement, resource waste, and even threaten the safe operation of the unit.

[0003] In the bolt fastening process of the inner end cover, the following problems are often encountered: 1) the fastening torque is not enough, the nut cannot compact the sealing gasket, thereby causing external leakage. 2) the space is narrow, only 300mm wide and 500mm high, the personnel need to explore into the end cover chamber, and hold the nut tool with one hand, when the crowbar is used to pull the nut tool, it is difficult to hold the nut tool with downward force with one hand, and the fastening process is easy to be injured. 3) multiple persons are needed to assist and cooperate, and the work efficiency is not high. UTILITY MODEL CONTENTS

[0004] In order to overcome the deficiencies in the prior art, the utility model aims at providing a generator inner end cover dismounting auxiliary device, on the one hand, avoiding the safety risk of accidental injury caused by hand holding the nut tool, and on the other hand, ensuring the uniformity and reliability of the nut fastening torque, thereby compacting the sealing gasket and ensuring the sealing performance.

[0005] The utility model discloses a technical scheme as follows solves the above problems:

[0006] A generator inner end cover dismounting auxiliary device, including nut tool, ratchet wrench, slide rail, with the slide rail sliding assembly's sliding piece and install on the sliding piece's lifting mechanism.

[0007] Further, the lifting mechanism includes the suspension frame fixed connection with the sliding piece, with the suspension frame rotary assembly's winch wheel and winding on the winch wheel's lifting rope, the free end of lifting rope is connected with nut tool.

[0008] Further, the suspension frame is provided with lifting rope release locking device.

[0009] Further, the winch wheel is through the pivot and suspension frame rotary assembly.

[0010] Further, the force end of nut tool is provided with ratchet wrench dismounting part.

[0011] Further, the slide rail is through slide rail support and big end cap fixed connection.

[0012] Compared with prior art, the utility model has the beneficial effects that:

[0013] The generator inner end cover dismounting auxiliary device of the application includes nut tool, ratchet wrench, slide rail, with the slide rail sliding assembly's sliding piece and install on the sliding piece's lifting mechanism.Using the generator inner end cover dismounting auxiliary device of the application, on the one hand, avoid the safety risk of accidental injury of hand-held nut tool, on the other hand, ensure the uniformity and reliability of nut fastening torque, thereby compacting sealing pad and guaranteeing sealing performance. BRIEF DESCRIPTION OF DRAWINGS

[0014] The utility model will be further described below in connection with the drawings and examples.

[0015] Fig. 1 It is the structural schematic diagram of one embodiment of the utility model;

[0016] Fig. 2 It is the structural schematic diagram of another embodiment of the utility model. DETAILED DESCRIPTION

[0017] The utility model will be further described below in connection with the drawings and examples.

[0018] Please refer to Figs. 1-2As shown, the embodiment discloses a generator inner end cover dismounting auxiliary device, which comprises a nut tool 3, a ratchet wrench 1, a slide rail 7, a sliding piece 5 slidably assembled with the slide rail, and a lifting mechanism installed on the sliding piece. The lifting mechanism comprises a suspension frame fixedly connected with the sliding piece, a winding wheel rotatably assembled with the suspension frame, and a lifting rope 9 wound on the winding wheel. The free end of the lifting rope is connected with the nut tool. Specifically, the free end of the lifting rope can be connected with the nut tool in the form of a running knot as shown in Fig. 1 or a sleeve ring 10 can be slidably assembled on the nut tool as shown in Fig. 2 a nut 11 is welded on the sleeve ring, and the free end of the lifting rope is tied with the nut. In this way, the nut tool can rotate freely.

[0019] The suspension frame is provided with a lifting rope release locking device 6, which can be locked after the required length of the lifting rope is released or after the required length is recovered.

[0020] The winding wheel is rotatably assembled with the suspension frame through a rotating shaft. The force applying end of the nut tool is provided with a ratchet wrench dismounting part. The slide rail is fixedly connected with the large end cover 4 through a slide rail support 8.

[0021] When the nut tool is moved to be sleeved with different inner end cover nuts 2, the sliding piece is slid, and the lifting rope is retracted or lengthened, so that the nut tool is horizontal, the lifting rope release locking device is locked, the ratchet wrench is sleeved with the ratchet wrench dismounting part, and the inner end cover nuts can be uniformly loosened or tightened.

[0022] In summary, the generator inner end cover dismounting auxiliary device of the application can avoid the safety risk of accidental injury caused by holding the nut tool by hand, and ensure the uniformity and reliability of the nut fastening torque, so as to compact the sealing gasket and ensure the sealing performance.

[0023] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the application and are not limited. Although the application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the application can be modified or replaced equivalently without departing from the purpose and scope of the application. They should be covered in the scope of the claims of the application.

Claims

1. An auxiliary device for disassembling and assembling an inner end cover of a generator, characterized in that: The utility model relates to a nut tool, a ratchet spanner, a slide rail, a slider slidingly assembled with the slide rail and a lifting mechanism mounted on the slider, wherein the lifting mechanism comprises a hanging frame fixedly connected with the slider, a winding wheel rotatably assembled with the hanging frame and a lifting rope wound on the winding wheel, a free end of the lifting rope is connected with the nut tool, a lifting rope releasing locking device is arranged on the hanging frame, the winding wheel is rotatably assembled with the hanging frame through a rotating shaft, a ratchet spanner dismounting part is arranged on a force applying end of the nut tool and the slide rail is fixedly connected with a large end cover through a slide rail support.

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