A stator slot wedge assembly method based on a stator slot wedge mechanized assembly device

Abstract

The present invention relates to a stator slot wedge assembly method based on a stator slot wedge mechanized assembly device, and belongs to the field of generator manufacturing technology. A stator slot wedge mechanized assembly device is provided at one end of the stator slot wedge, including a knocking mechanism and a feed output mechanism; a knocking mechanism is provided between the stator slot wedge and the feed output mechanism. The operator uses the knocking mechanism instead of swinging a hammer to knock, and the operator cooperates with the feed output mechanism to advance the knocking mechanism so that the slot wedge can be pushed to the designed position. The method provided by the present invention can replace the traditional manual assembly method of generator stator slot wedge assembly, and use a machine instead of manual assembly, which can improve the stator slot wedge assembly efficiency, reduce the operator's physical exertion intensity, and reduce operational safety hazards.

Description

Technical Field

[0001] The invention relates to a stator slot wedge assembling method based on a stator slot wedge mechanized assembling device, belonging to the technical field of generator manufacturing. Background Art

[0002] In the power industry, generator stator bars are subject to electromagnetic forces. If their freedom is unrestricted, the coils will move within the stator slots, wearing out the insulation, causing in-slot discharges and even motor malfunctions. To limit the bars' freedom of movement, stator slot wedges are used to hold the bars in place, creating significant resistance during wedge assembly. To maximize the wedge's locking effect, each stator slot is equipped with an equal number of slot wedges.

[0003] Traditionally, stator slot wedge assembly requires the collaboration of at least two people, working inside the stator bore. Starting from the axial center of the stator core, the wedges are assembled one by one toward the steam and excitation ends. During slot wedge assembly, one person holds a dedicated slot wedge assembly tool while the other bends over and strikes the tool with a large hammer. This intermittent cycle of impacts ensures the tool pushes the slot wedge into the designed position.

[0004] Due to the significant resistance of the slot wedge, operators need to exert considerable force to swing the hammer. Furthermore, the limited space within the stator bore prevents operators from maintaining a straight posture, which can severely damage their lower backs. Manual assembly of the slot wedges, which relies on intermittent, cyclical impacts, is inefficient and requires high proficiency from both operators. Otherwise, the hammer can easily strike the operator, causing a safety accident.

[0005] Therefore, assembling stator slot wedges with the help of mechanized devices is of great significance to improving the stator slot wedge assembly efficiency, reducing the physical exertion intensity of operators, and reducing operational safety hazards.

[0006] However, in the traditional stator slot wedge assembly method, the assembly sequence starts from the generator's axial center and moves toward the steam and excitation ends, one slot wedge at a time. Therefore, the position where the operator strikes the slot wedge moves with the position of the slot wedge being assembled. This characteristic means that operators who use a simple machine to replace the striking action will need to move the machine after each slot wedge is installed, which is time-consuming and labor-intensive, and improper protection may damage the stator core.

[0007] Therefore, a new stator slot wedge assembly method is needed, which can not only mechanize the assembly of the stator slot wedge, but also save time and labor and avoid damaging the stator core. Summary of the Invention

[0008] The purpose of the present invention is to solve the technical problem of how to assemble stator slot wedges mechanizedly while saving time and labor and not damaging the stator core.

[0009] In order to achieve the purpose of solving the above-mentioned problems, the technical solution adopted by the present invention is to provide a mechanized assembly device for a stator slot wedge. A mechanized assembly device for a stator slot wedge is provided at one end of the stator slot wedge, including a knocking mechanism and a feed and output mechanism; a knocking mechanism is provided between the stator slot wedge and the feed and output mechanism.

[0010] Preferably, the knocking mechanism is configured as a cyclic impact mechanism.

[0011] Preferably, the knocking mechanism includes an impact head and a second fixed part; one end of the second fixed part is provided with the impact head, and the other end of the second fixed part is connected to the feed output mechanism.

[0012] Preferably, the feeding and outputting mechanism includes a moving part and a fixed part 1; the fixed part 2 of the knocking mechanism is connected to the moving part.

[0013] Preferably, an impact rod is provided between the stator slot wedge and the impact head; and a limiting device is provided on the outer periphery of the impact rod so that the impact rod can only move in the front-rear direction.

[0014] Preferably, the knocking mechanism and the feeding and outputting mechanism are respectively provided with a guiding mechanism.

[0015] Preferably, the guide mechanism includes a support and a slide; the support is fixed to the ground by a ground hook, the fixed part 1 of the feed and output mechanism is connected to the support, the fixed part 2 of the knocking mechanism is connected to the slide, and the slide is installed in the guide rail of the support.

[0016] The present invention provides a stator slot wedge assembly method based on a stator slot wedge mechanized assembly device, comprising the following steps:

[0017] Step 1: Place the stator slot wedge mechanized assembly device on the outer side of the stator wire inserting platform at one end of the stator, adjust the stator slot wedge mechanized assembly device so that its impact rod is in the appropriate position, and move the impact rod back and forth along the axial direction of the generator to ensure that its range of motion meets the stroke of one slot wedge assembly;

[0018] Step 2: Rotate the generator stator so that the center line of the slot wedge to be assembled is aligned with the center line of the impact rod of the stator slot wedge mechanized assembly device;

[0019] Step 3: Arrange the knock force transmission chain according to the generator model;

[0020] Step 4: Place a wedge-under-wedge material that meets the design requirements under the slot wedge to be assembled, start the feed output mechanism of the stator slot wedge mechanized assembly device, and push the striking mechanism of the stator slot wedge mechanized assembly device forward. The striking mechanism then pushes the impact rod until the impact rod presses against the outermost slot wedge in the striking force transmission chain.

[0021] Step 5: Start the knocking mechanism of the mechanized assembly device of the stator slot wedge, so that its impact head knocks the impact rod, and the impact rod then knocks the outermost slot wedge of the knocking force transmission chain; the outermost slot wedge of the knocking force transmission chain is fed forward by the knocking force of the impact rod, and transmits the knocking force to the second slot wedge from the outside to the inside of the knocking transmission chain, and so on, until the knocking force is transmitted to the slot wedge to be assembled, so that the slot wedge to be assembled is knocked to the designed position, and when the slot wedge to be assembled is knocked to the designed position, the feeding action of the feed output mechanism and the knocking action of the knocking mechanism are immediately stopped, and the mechanized assembly process of one slot wedge is completed.

[0022] Preferably, the striking force transmission chain in the above step 3 is composed of slot wedges.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention uses a striking mechanism to simulate the hammering action during generator stator slot wedge assembly. The high-frequency impact of the striking mechanism enables the slot wedge to be assembled to be pushed forward even under conditions of high resistance. However, the impact of the striking mechanism alone would push the slot wedge too far to reach the designed position. Therefore, a feed output mechanism is added to feed the striking mechanism forward as a whole, thereby enabling the mechanized stator slot wedge assembly device to simultaneously feed the stator slot wedge while striking it until the stator slot wedge is knocked into the designed position.

[0025] 2. The present invention achieves the goal of reducing the position of the striking point of the generator stator slot wedge assembly to a certain range and outside the generator stator chamber by constructing a striking force transmission chain, which provides an application basis for the mechanized assembly device and ensures that the method will not cause damage to the generator stator.

[0026] 3. The present invention replaces the traditional manual hammering method to assemble the generator stator slot wedge, thereby improving the stator slot wedge assembly efficiency;

[0027] 4. The present invention uses a machine to replace manual labor to perform dangerous knocking actions, thereby improving the safety of operators.

[0028] 5. The present invention uses mechanized assembly of stator slot wedges. Compared with manual assembly, the device for assembling stator slot wedges can hammer in slot wedges with higher preload force, thereby improving the quality of generator products.

[0029] 6. The present invention uses mechanized assembly of stator slot wedges, and the operator does not need to enter the stator chamber and bend over to exert force, which reduces the operator's labor intensity and physical wear and tear. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the process flow of a stator slot wedge assembly method based on a stator slot wedge mechanized assembly device according to the present invention;

[0031] Figure 2 This is a schematic diagram of an application scenario of a mechanized assembly device for stator slot wedges according to the present invention;

[0032] Figure 3 It is a cross-sectional view of a mechanized assembly device for stator slot wedges according to the present invention.

[0033] Figure numerals: 1. knocking mechanism; 2. feeding and output mechanism; 3. impact head; 4. moving part; 5. impact rod; 6. slide; 7. support; 8. ground hook; 9. fixed part one; 10. fixed part two; 11. guide mechanism; 12. knocking force transmission chain; 13. slot wedge to be assembled; 14. slot wedge for closing the door; 15. second slot wedge; 16. material under the wedge; 17. stator wire embedding platform; 18. generator stator; 19. assembled slot wedge; 20. mechanized assembly device for stator slot wedges. DETAILED DESCRIPTION

[0034] In order to make the present invention more clearly understood, preferred embodiments are described in detail below with reference to the accompanying drawings:

[0035] like Figure 1-3 As shown, the present invention provides a mechanized assembly device 20 for stator slot wedges, and a mechanized assembly device 20 for stator slot wedges is provided at one end of the stator slot wedge, comprising a knocking mechanism 1 and a feed output mechanism 2; a knocking mechanism 1 is provided between the stator slot wedge and the feed output mechanism 2. The knocking mechanism 1 is configured as a cyclic impact mechanism. The knocking mechanism 1 comprises an impact head 3 and a fixed part 10; an impact head 3 is provided at one end of the fixed part 10, and the other end of the fixed part 10 is connected to the feed output mechanism 2. The feed output mechanism 2 comprises a moving part 4 and a fixed part 9; the fixed part 10 of the knocking mechanism 1 is connected to the moving part 4. An impact rod 5 is provided between the stator slot wedge and the impact head 3; a limiting device is provided on the outer periphery of the rod body of the impact rod 5 so that the impact rod can only move in the forward and backward directions. A guide mechanism 11 is provided on the knocking mechanism 1 and the feed output mechanism 2, respectively. The guide mechanism 11 includes a support 7 and a slide 6; the support 7 is fixed to the ground by a ground hook 8, the fixed part 1 9 of the feed and output mechanism 2 is connected to the support 7, and the fixed part 2 10 of the knocking mechanism 1 is connected to the slide 6. The slide 6 is installed in the guide rail of the support 7 and can move back and forth along the guide rail of the support 7.

[0036] The present invention provides a stator slot wedge assembly method based on a stator slot wedge mechanized assembly device, comprising the following steps:

[0037] Step 1: Place the stator slot wedge mechanized assembly device 20 outside the bore of the stator wire inserting platform at one end of the stator, adjust the stator slot wedge mechanized assembly device so that its impact rod is in an appropriate position, and move the impact rod back and forth along the axial direction of the generator to ensure that its range of motion meets the stroke of one slot wedge assembly;

[0038] Step 2: Rotate the generator stator so that the center line of the slot wedge to be assembled is aligned with the center line of the impact rod of the stator slot wedge mechanized assembly device;

[0039] Step 3: Arrange the knock force transmission chain 12 according to the generator model;

[0040] Step 4: A wedge lower material 16 that meets the design requirements is placed under the slot wedge to be assembled, and the feed output mechanism of the stator slot wedge mechanized assembly device is activated, so that it pushes the striking mechanism of the stator slot wedge mechanized assembly device forward. The striking mechanism then pushes the impact rod until the impact rod presses against the outermost slot wedge of the striking force transmission chain.

[0041] Step 5: Start the knocking mechanism 1 of the stator slot wedge mechanized assembly device 20, so that its impact head 3 knocks the impact rod 5, and the impact rod 5 then knocks the outermost slot wedge of the knocking force transmission chain 12; the outermost slot wedge of the knocking force transmission chain is fed forward by the knocking force of the impact rod, and transmits the knocking force to the second slot wedge 15 from the outside to the inside of the knocking transmission chain, and so on, until the knocking force is transmitted to the slot wedge to be assembled 13, so that the slot wedge to be assembled 13 is knocked to the designed position, and when the slot wedge to be assembled 13 is knocked to the designed position, the feeding action of the feed output mechanism and the knocking action of the knocking mechanism are immediately stopped, and the mechanized assembly process of one slot wedge is completed.

[0042] The striking force transmission chain 12 in the above step 3 is composed of slot wedges.

[0043] Attachment Figure 1 The present invention provides a process flow chart of a stator slot wedge assembly method based on a stator slot wedge mechanized assembly device, with Figure 2 Schematic diagram of the application scenario of this method. The present invention provides a stator slot wedge assembly method based on a stator slot wedge mechanized assembly device 20. After the slot wedge 13 to be assembled on the generator stator 18 is equipped with the wedge lowering material 16, the stator slot wedge mechanized assembly device 20 is activated to strike the striking force transmission chain 12. The striking force provided by the stator slot wedge mechanized assembly device 20 is transmitted to the slot wedge 13 to be assembled through the striking force transmission chain 12, causing the slot wedge 13 to be assembled to be fed forward until it reaches the designed position, thereby achieving mechanized assembly of the stator slot wedge.

[0044] Attachment Figure 2 A side view of the striking force transmission chain 12 is also shown. The chain 12 is composed of finished generator slot wedges. Following the designed slot wedge assembly positions, all finished slot wedges, starting with the slot wedge 13 and ending with the closing wedge 14, are placed into the slots of the generator stator 18. No material is placed under the slot wedges to ensure easy axial movement within the slot.

[0045] Attachment Figure 3 A side view of the mechanized assembly device 20 for stator slot wedges is shown. The mechanized assembly device 20 for stator slot wedges mainly includes a striking mechanism 1 and a feed output mechanism 2. The striking mechanism 1 is a cyclic impact mechanism that provides continuous impact force, which simulates the action of an operator lifting a hammer and striking. Each impact can advance the slot wedge being assembled by 0-100 mm. The feed output mechanism 2 is connected to the striking mechanism 1 and provides a stable and controllable force to the striking mechanism 1, so that the striking mechanism 1 feeds forward. The feed amount provided by the feed output mechanism 2 plus the impact amount provided by the striking mechanism 1 enables the slot wedge to be assembled to the designed position. The striking mechanism 1 uses compressed air or electric energy as the impact power source. The striking mechanism 1 includes a fixed part 10 and an impact head 3. During operation, the impact head 3 strikes an impact rod 5, and the impact rod 5 strikes the slot wedge to the designed position. The fixed part 10 is connected to the feed output mechanism 2 and is the fulcrum of the recoil force generated when the impact head 3 strikes the impact rod 5. The impact rod 5 is placed between the impact head 3 and the stator slot wedge, and has no fixed connection with the impact head 3 or the stator slot wedge. It is restricted by the limiting wheel so that it has only one degree of freedom in one direction, that is, the straight line direction that the impact head 3 and the slot wedge pass through together. When the stator slot wedge mechanized assembly device 20 is working, the knocking mechanism 1 sends an impact, causing the impact head 3 to quickly hit the impact rod 5. After the impact, the impact rod 5 is quickly pushed forward until the other end of the impact rod 5 hits the stator slot wedge, and the stator slot wedge is fed forward after the impact. The feed output mechanism 2 includes a fixed part 9 and a moving part 4. The fixed part 9 is fixed relative to the generator stator; the moving part 4 is not fixed relative to the generator stator. The fixed part 10 of the knocking mechanism 1 is fixed relative to the moving part 4 of the feed output mechanism 2. The moving part 4 of the feed output mechanism 2 and the fixed part 10 of the knocking mechanism 1 are connected by a guide mechanism 11 to limit the movement direction to the axial direction of the generator. The guide mechanism 11 comprises a support 7 and a slide 6. A position-limiting structure ensures that the slide 6 has one and only one degree of freedom on the support 7, which aligns with the impact direction of the impact head 3. The fixed portion 1 (9) of the feed and output mechanism 2 is bolted to the support 7; the fixed portion 2 (10) of the striking mechanism 1 is also bolted to the slide 6. The support 7 is secured to the ground using gravity or a ground hook 8, ensuring that the position of the support 7 relative to the generator stator is fixed during operation of the stator wedge mechanized assembly device 20.

[0046] The detailed steps of a stator slot wedge assembly method based on a stator slot wedge mechanized assembly device 20 are as follows: placing the stator slot wedge mechanized assembly device 20 in an appropriate position, placing the stator slot wedge mechanized assembly device 20 on the stator wire embedding platform 17 at one end of the stator (outside the bore), adjusting the stator slot wedge mechanized assembly device 20 so that its impact rod 5 is collinear with the center line of the generator stator slot wedge, and moving the impact rod 5 back and forth along the axial direction of the generator to ensure that its range of motion meets the stroke of a slot wedge assembly. At the same time, prepare the stator slot wedge for assembly of the striking force transmission chain 12 according to the generator model.

[0047] The generator stator is rotated so that the center line of the slot wedge to be assembled is aligned with the center line of the impact rod 5 of the stator slot wedge mechanized assembly device 20. The striking force transmission chain 12 is arranged according to the generator model.

[0048] The wedge lower material 16 required by the design is placed under the slot wedge 13 to be assembled, and the feeding and output mechanism 2 of the stator slot wedge mechanized assembly device 20 is activated, so that it pushes the striking mechanism 1 of the stator slot wedge mechanized assembly device 20 forward. The striking mechanism 1 then pushes the impact rod 5 until it contacts the outermost closing slot wedge 14 of the striking force transmission chain 12. The striking mechanism 1 of the stator slot wedge mechanized assembly device 20 is activated, so that its punch 3 strikes the impact rod 5, which then strikes the outermost closing slot wedge 14 of the striking force transmission chain 12. The outermost door closing slot wedge 14 of the knocking force transmission chain 12 is fed forward by the knocking force of the impact rod 5, and transmits the knocking force to the second slot wedge 15 from the outside to the inside of the knocking force transmission chain 12, and so on, until the knocking force is transmitted to the slot wedge 13 to be assembled, so that the slot wedge 13 to be assembled is knocked to the designed position. When the slot wedge 13 to be assembled is knocked to the designed position, it becomes an assembled slot wedge 19, and the feeding action of the feeding output mechanism 2 and the knocking action of the knocking mechanism 1 are immediately stopped, the feeding output mechanism 2 is started to retreat it to the initial position, and the impact rod 5 is moved to retreat it to the initial position. The next slot wedge 13 to be assembled is padded with the wedge lower material 16 that meets the design requirements and the above steps are repeated until all the slot wedges are assembled. The generator stator is rotated so that the center line of the slot wedge of the next slot to be assembled is collinear with the center line of the impact rod 5. The knocking force transmission chain 12 is rearranged and the above steps are repeated until the entire generator stator slot wedge is assembled. After that, the stator slot wedge mechanized assembly device 20 is removed and the inside of the generator stator chamber is cleaned.

[0049] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form or substance. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the present invention, and these improvements and supplements should also be regarded as the scope of protection of the present invention. Any equivalent changes, modifications and evolutions made by technicians familiar with this profession without departing from the spirit and scope of the present invention by using the technical content disclosed above are all equivalent embodiments of the present invention; at the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A stator slot wedge assembly method based on a stator slot wedge mechanized assembly device, characterized in that: The following steps are involved: Step 1: Place the stator slot wedge mechanized assembly device outside the bore of the stator wire inserting platform at one end of the stator, adjust the stator slot wedge mechanized assembly device so that its impact rod is in an appropriate position, and move the impact rod back and forth along the axial direction of the generator to ensure that its range of motion meets the stroke of one slot wedge assembly; the stator slot wedge mechanized assembly device includes a knocking mechanism and a feed output mechanism; the knocking mechanism is provided between the stator slot wedge and the feed output mechanism; Step 2: Place a wedge-under-wedge material that meets the design requirements under the slot wedge to be assembled, start the feed output mechanism of the stator slot wedge mechanized assembly device, and push the striking mechanism of the stator slot wedge mechanized assembly device forward. The striking mechanism then pushes the impact rod until the impact rod presses against the outermost slot wedge in the striking force transmission chain. Step 3: Start the knocking mechanism of the mechanized assembly device of the stator slot wedge, so that its impact head knocks the impact rod, and the impact rod then knocks the outermost slot wedge of the knocking force transmission chain; the outermost slot wedge of the knocking force transmission chain is fed forward by the knocking force of the impact rod, and transmits the knocking force to the second slot wedge from the outside to the inside of the knocking transmission chain, and so on, until the knocking force is transmitted to the slot wedge to be assembled, so that the slot wedge to be assembled is knocked to the designed position, and when the slot wedge to be assembled is knocked to the designed position, the feeding action of the feed output mechanism and the knocking action of the knocking mechanism are immediately stopped, and the mechanized assembly process of one slot wedge is completed.

2. The stator slot wedge assembly method based on the stator slot wedge mechanized assembly device according to claim 1, characterized in that: The knocking mechanism is configured as a cyclic impact mechanism.

3. The stator slot wedge assembly method based on the stator slot wedge mechanized assembly device according to claim 2, characterized in that: The knocking mechanism includes an impact head and a second fixed part; one end of the second fixed part is provided with the impact head, and the other end of the second fixed part is connected to the feed output mechanism.

4. The stator slot wedge assembly method based on the stator slot wedge mechanized assembly device according to claim 3, characterized in that: The feeding and outputting mechanism includes a moving part and a fixed part 1; the fixed part 2 of the knocking mechanism is connected to the moving part.

5. The stator slot wedge assembly method based on the stator slot wedge mechanized assembly device according to claim 4, characterized in that: An impact rod is provided between the stator slot wedge and the impact head; and a limiting device is provided on the outer periphery of the impact rod so that the impact rod can only move in the front-rear direction.

6. The stator slot wedge assembly method based on the stator slot wedge mechanized assembly device according to claim 5, characterized in that: The knocking mechanism and the feeding and outputting mechanism are respectively provided with guiding mechanisms.

7. The stator slot wedge assembly method based on the stator slot wedge mechanized assembly device according to claim 6, characterized in that: The guide mechanism includes a support and a slide; the support is fixed to the ground through a ground hook, the fixed part 1 of the feed and output mechanism is connected to the support, the fixed part 2 of the knocking mechanism is connected to the slide, and the slide is installed in the guide rail of the support.

8. The stator slot wedge assembly method based on the stator slot wedge mechanized assembly device according to claim 1, characterized in that: The following steps are also included: After step 1, the generator stator is rotated so that the center line of the slot wedge to be assembled is collinear with the center line of the impact rod of the stator slot wedge mechanized assembly device, and then step 2 is continued.

9. A stator slot wedge assembly method based on a stator slot wedge mechanized assembly device according to claim 1 or 8, characterized in that: The method also includes arranging a knock force transmission chain according to the generator model before step 3; the knock force transmission chain is composed of slot wedges.

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