Hydro-generator stator bar ejection device and method

Abstract

A kind of water turbine generator set stator bar ejection device and ejection method, there is wedge-shaped gap between upper layer bar and lower layer bar top, wedge-shaped gap is placed wedge-shaped ejector, wedge-shaped ejector is equipped with ejection oil cylinder. By placing wedge-shaped ejector between upper layer bar and lower layer bar, the ejection oil cylinder of wedge-shaped ejector is used to carry out ejection operation on upper layer bar, and back pressure device is arranged outside upper layer bar to help carry out ejection operation by ejection and back pressure alternation operation, and the installation operation of bar can also be carried out by back pressure, the action of ejection and back pressure is controlled by electric hydraulic pump, and the wedge-shaped intermittent is made larger by ejection operation, wedge-shaped ejector can be lowered by self-weight to make the ejection surface move down until completely ejected, the ejection operation of device can be automatically controlled by control device, greatly reduce the labor intensity of previous manpower pry, reduce the damage to bar.

Description

Technical Field

[0001] This invention relates to the field of hydro-generator maintenance technology, specifically to a device and method for ejecting stator bars of a hydro-generator set. Background Technology

[0002] In the maintenance and overhaul of hydro-generator units, the disassembly of stator bars is crucial. As an important component of the hydro-generator, the efficiency and safety of stator bar disassembly directly affect the maintenance cycle and operational safety of the entire generator unit. However, existing stator bar disassembly techniques still face many difficulties and shortcomings in practical operation.

[0003] First, in existing technologies, the disassembly of stator bars often relies on manual operation. This not only increases the labor intensity of operators but also makes it difficult to ensure the accuracy and consistency of the disassembly process. For example, when using traditional hand tools or simple mechanical equipment for disassembly, operators need to manually adjust the angle and force of the tools according to the structural characteristics of the bars. This method is not only inefficient but also prone to damaging the bars and surrounding structures.

[0004] Secondly, existing stator bar disassembly devices are insufficient in terms of portability and efficiency. While some disassembly devices can achieve a certain degree of automation, their large size and complex structure make them difficult to adapt to confined workspaces and complex working environments. Furthermore, these devices often consume significant amounts of energy and time during the disassembly process, resulting in overall low disassembly efficiency.

[0005] Furthermore, existing stator bar disassembly technologies lack effective control over potential safety risks during the disassembly process. Due to the tight connection between the bars and the surrounding structure, loosening or detachment may occur during disassembly. If the disassembly device cannot effectively identify and address these risks, it will threaten the safety of the operators.

[0006] Existing technologies also include tools for disassembling stator bars. For example, Chinese patent document CN219554774U describes a highly efficient and portable device for disassembling stator bars of a hydro-generator, comprising: a soft base with one side serving as a support surface for contacting the side of the stator core; a steel pipe with a handle at the top and a lifting lug fixed to the lower side, the lower end of which is rotatably connected to the soft base via a pivot; and a soft sling attached to the lifting lug for slipping onto the stator bars during disassembly. This disassembly method relies on a lifting device, and its precision and convenience are clearly insufficient. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a stator bar ejection device and ejection method for hydro-generator sets. The aim is to improve the efficiency and safety of stator bar disassembly by overcoming the shortcomings of the prior art. The device involved in the present invention has the characteristics of compact structure, simple operation, high efficiency and portability, and can realize the rapid, accurate and safe disassembly of stator bars, providing strong technical support for the maintenance and repair of hydro-generator sets.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0009] A stator bar ejection device for a hydro-generator set includes upper and lower stator bars with a wedge-shaped gap between their tops. A wedge-shaped ejector is placed within the wedge-shaped gap, and an ejector cylinder is installed inside the wedge-shaped ejector. The wedge-shaped ejector uses the lower stator bar as its load-bearing base and pushes the upper stator bar away from the lower stator bar by the action of the ejector cylinder, thus widening the wedge-shaped gap. The widened wedge-shaped gap causes the wedge-shaped ejector to move downward due to its own weight, and the ejector cylinder continues to operate, causing the upper stator bar to completely detach from the lower stator bar.

[0010] The upper layer bar is equipped with a back pressure device at its front end, and a back pressure cylinder is installed on the back pressure device to perform back pressure operation on the upper layer bar.

[0011] The aforementioned back pressure device is installed on a slide bar, which is placed vertically and fixed at both ends. The back pressure device can slide along the slide bar and remain fixed.

[0012] The aforementioned ejector cylinder and back pressure cylinder are connected to the electric hydraulic pump via hydraulic lines.

[0013] The aforementioned electric hydraulic pump is equipped with a valve body. The ejector cylinder and the return cylinder are connected to the valve body port through hydraulic lines. The valve body ensures that when one of the ejector cylinder and the return cylinder is in operation, the other is in an unloaded state.

[0014] The aforementioned wedge-shaped ejector includes a base plate that contacts the lower layer of wire rods. The lower end of the base plate is rotatably connected to the ejector plate body. An ejector cylinder is provided between the ejector plate body and the upper end of the base plate. The telescopic end of the ejector cylinder is connected to the ejector plate body, and the ejector plate body contacts the back of the upper layer of wire rods.

[0015] The piston end of the aforementioned back pressure cylinder is connected to a back pressure rod, and the end of the back pressure rod is rotatably connected to a contact plate. The contact plate is made of a flexible material and its hardness is less than that of a wire rod.

[0016] An interlayer spacer is provided between the upper and lower layer bars, and a flexible protective layer is provided at the bottom of the wedge-shaped ejector.

[0017] The ejection method using the above-described stator bar ejection device for a hydro-generator set comprises the following steps:

[0018] Step 1: First, use a tool to pull up the end of the bar so that the bar protrudes from the iron core and expands a wedge-shaped gap between the upper and lower bars.

[0019] Step 2: Insert the wedge-shaped ejector tip downwards into the wedge-shaped gap;

[0020] Step 3: Start the electric hydraulic pump and use oil pressure to slowly push the upper end of the bar out. As the bar is pushed out, the wedge gap widens, and the wedge ejector slowly falls.

[0021] Step 4: Adjust the position of the back pressure device downwards, following the wedge-shaped ejector;

[0022] Step 5: Continue to control the electric hydraulic pump to push the middle of the bar out until the entire bar is pushed out.

[0023] In step three above, the valve body inside the electric hydraulic pump continuously changes position, causing one of the ejection cylinder and the back pressure cylinder to eject while the other is unloaded. The ejection cylinder and the back pressure cylinder work alternately to eject and back pressure the upper layer of bars, and the ejection is the end of the process.

[0024] This invention provides a stator bar ejection device for a hydro-generator set. A wedge-shaped ejector is placed between the upper and lower stator bars. The upper stator bar is ejected using an ejection cylinder of the wedge-shaped ejector. A backpressure device is installed outside the upper stator bar to assist the ejection operation through alternating ejection and backpressure. Backpressure can also be used for bar installation. The ejection and backpressure actions are controlled by an electric hydraulic pump. The ejection operation increases the wedge interval, allowing the wedge-shaped ejector to descend under its own weight, lowering the ejection surface until the bar is completely ejected. The ejection operation is automatically controlled by a control device, greatly reducing the labor intensity of manual prying and minimizing damage to the stator bars. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0026] Figure 1 This is a schematic diagram of the structure of the bar ejection device of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of the wedge-shaped ejector of the present invention;

[0028] Figure 3 This is a schematic diagram of the back pressure device of the present invention.

[0029] The components include: electric hydraulic pump 1, wedge ejector 2, base plate 201, ejector plate 202, ejector cylinder 203, flexible protective layer 204, back pressure device 3, back pressure cylinder 301, back pressure rod 302, contact plate 303, slide rod 4, fixed seat 5, interlayer spacer 6, upper layer bar 7, and lower layer bar 8. Detailed Implementation

[0030] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0031] like Figures 1-3 As shown, a stator bar ejection device for a hydro-generator set includes an upper bar 7 and a lower bar 8. A wedge-shaped gap exists between the tops of the upper bar 7 and the lower bar 8. A wedge-shaped ejector 2 is placed in the wedge-shaped gap, and an ejection cylinder 203 is installed inside the wedge-shaped ejector 2. The wedge-shaped ejector 2 uses the lower bar 8 as its load-bearing base and pushes the upper bar 7 away from the lower bar 8 by the action of the ejection cylinder 203, thus enlarging the wedge-shaped gap. The enlarged wedge-shaped gap causes the wedge-shaped ejector 2 to move downward due to its own weight. The ejection cylinder 203 continues to work, causing the upper bar 7 to completely detach from the lower bar 8.

[0032] like Figure 1 As shown, a wedge-shaped ejector 2 is placed between the upper layer bar 7 and the lower layer bar 8. The ejector cylinder 203 inside the wedge-shaped ejector 2 extends, which increases the gap between the upper layer bar 7 and the lower layer bar 8, allowing the wedge-shaped ejector 2 to penetrate deeper between them and continue working to completely separate them.

[0033] The upper layer bar 7 is provided with a back pressure device 3 at its front end. The back pressure device 3 is provided with a back pressure cylinder 301, which performs back pressure operation on the upper layer bar 7.

[0034] The back pressure device 3 can be used to press the bar back into the core slot. In addition, when the wedge ejector 2 is not easy to eject the upper bar 7, the upper bar 7 can be ejected more easily by the cooperation of the back pressure device 3 and the wedge ejector 2.

[0035] The aforementioned back pressure device 3 is installed on the slide rod 4, which is placed vertically and fixed at both ends. The back pressure device 3 can slide along the slide rod 4 and be fixed.

[0036] The back pressure unit 3 and the slide rod 4 can be slidably connected. The slide rod 4 passes through the end of the back pressure unit 3. The back pressure unit 3 is equipped with a locking component. The two ends of the slide rod 4 can be magnetically fixed to the surface of the stator core. The slide rod 4 can also be a lead screw structure. The bottom of the back pressure unit 3 is equipped with a nut that meshes with the lead screw. The lead screw is driven by a motor to make the back pressure unit 3 move up and down along the slide rod 4.

[0037] The aforementioned ejector cylinder 203 and back pressure cylinder 301 are connected to the electric hydraulic pump 1 via hydraulic lines.

[0038] The aforementioned electric hydraulic pump 1 is equipped with a valve body. The ejector cylinder 203 and the back pressure cylinder 301 are connected to the valve body port through hydraulic pipelines. The valve body ensures that when one of the ejector cylinder 203 and the back pressure cylinder 301 is in operation, the other is in an unloaded state.

[0039] The aforementioned wedge-shaped ejector 2 includes a base plate 201 that contacts the lower layer bar 8. The lower end of the base plate 201 is rotatably connected to the ejector plate 202. An ejector cylinder 203 is provided between the ejector plate 202 and the upper end of the base plate 201. The telescopic end of the ejector cylinder 203 is connected to the ejector plate 202. The ejector plate 202 contacts the back of the upper layer bar 7.

[0040] The triangular structure formed by the base plate 201, the ejector plate 202 and the ejector cylinder 203 makes the base plate 201 and the ejector plate 202 form a wedge shape, and the extension and retraction of the ejector cylinder 203 is used to detach the upper layer bar 7 and the lower layer bar 8.

[0041] The piston end of the aforementioned back pressure cylinder 301 is connected to a back pressure rod 302. The end of the back pressure rod 302 is rotatably connected to a contact plate 303. The contact plate 303 is made of a flexible material and its hardness is less than that of a wire rod.

[0042] An interlayer spacer 6 is provided between the upper layer bar 7 and the lower layer bar 8, and a flexible protective layer 204 is provided at the bottom of the wedge-shaped ejector 2.

[0043] The ejection method using the above-described stator bar ejection device for a hydro-generator set comprises the following steps:

[0044] Step 1: First, use a tool to pull up the end of the bar so that the bar protrudes from the iron core and expands a wedge-shaped gap between the upper bar 7 and the lower bar 8.

[0045] Step 2: Insert the wedge-shaped ejector 2 into the wedge-shaped gap with the tip facing downwards;

[0046] Step 3: Start the electric hydraulic pump 1 and use oil pressure to slowly push the upper end of the bar out. As the bar is pushed out, the wedge gap widens, and the wedge ejector 2 can slowly fall down.

[0047] Step 4: Adjust the position of the back pressure device 3 downwards, following the wedge-shaped ejector 2;

[0048] Step 5: Continue to control the electric hydraulic pump 1 to push out the middle of the bar until the entire bar is pushed out.

[0049] In step three above, the valve body inside the electric hydraulic pump 1 continuously changes position, causing one of the ejector cylinder 203 and the back pressure cylinder 301 to eject while the other is unloaded. The ejector cylinder 203 and the back pressure cylinder 301 work alternately to eject and back pressure the upper bar 7, and the ejection is the end of the process.

[0050] Example:

[0051] The device mainly consists of five parts: an electric hydraulic pump, a wedge ejector, a back pressure device, a slide bar, and a magnetic fixing base.

[0052] The electric hydraulic pump is connected to the wedge ejector and the back pressure device via oil pipes, providing power to the wedge ejector and the back pressure device.

[0053] The wedge-shaped ejector is placed on the back of the bar to be ejected, and the bar is slowly ejected by hydraulic pressure. The bottom of the ejector is equipped with a flexible protective layer to protect other bars from damage due to excessive surface pressure.

[0054] The back pressure device is installed on the slide bar and uses hydraulic pressure to press the wire bar back into the iron core slot.

[0055] The slide bar is attached to the surface of the stator core by a magnetic fixing seat.

[0056] Working principle: First, use a hand chain hoist to slightly pull the end of the rod out of the iron core, so that there is a gap of about 5 cm on the back of the rod. Insert the wedge-shaped ejector into the gap and use hydraulic pressure to slowly push out the upper end of the rod. As the rod is pushed out, the wedge-shaped ejector slowly falls down to continue pushing out the middle part of the rod until the entire rod is pushed out.

[0057] If the bar gets stuck with the iron core during the ejection process and cannot be ejected directly, a back pressure device is used to press the bar back into the iron core slot. By repeatedly "push", "press", "push", and "press", the gap between the bar and the iron core is increased, thus easily ejecting the bar.

Claims

1. A stator bar ejection device for a hydro-generator set, characterized in that, The stator bars include an upper bar (7) and a lower bar (8). There is a wedge-shaped gap between the top of the upper bar (7) and the lower bar (8). A wedge-shaped ejector (2) is placed in the wedge-shaped gap. An ejector cylinder (203) is provided in the wedge-shaped ejector (2). The wedge-shaped ejector (2) uses the lower bar (8) as the force base and pushes the upper bar (7) away from the lower bar (8) through the action of the ejector cylinder (203), making the wedge-shaped gap larger. The wedge-shaped gap becomes larger, causing the wedge-shaped ejector (2) to move downward due to its own weight. The ejector cylinder (203) continues to work, making the upper bar (7) completely detach from the lower bar (8). The upper layer bar (7) is provided with a back pressure device (3) at the front end, and a back pressure cylinder (301) is provided on the back pressure device (3). The back pressure cylinder (301) performs back pressure operation on the upper layer bar (7). The back pressure device (3) is installed on the slide rod (4), which is placed vertically and fixed at both ends. The back pressure device (3) can slide along the slide rod (4) and be fixed. The ejector cylinder (203) and the back pressure cylinder (301) are connected to the electric hydraulic pump (1) through hydraulic pipelines; The electric hydraulic pump (1) is equipped with a valve body. The ejector cylinder (203) and the back pressure cylinder (301) are connected to the valve body port through hydraulic pipelines. The valve body allows one of the ejector cylinder (203) and the back pressure cylinder (301) to be in operation while the other is in an unloaded state.

2. The stator bar ejection device for a hydro-generator set according to claim 1, characterized in that, The wedge-shaped ejector (2) includes a base plate (201) that contacts the lower layer bar (8). The lower end of the base plate (201) is rotatably connected to the ejector plate (202). An ejector cylinder (203) is provided between the ejector plate (202) and the upper end of the base plate (201). The telescopic end of the ejector cylinder (203) is connected to the ejector plate (202). The ejector plate (202) contacts the back of the upper layer bar (7).

3. The stator bar ejection device for a hydro-generator set according to claim 2, characterized in that, The piston end of the back pressure cylinder (301) is connected to a back pressure rod (302), and the end of the back pressure rod (302) is rotatably connected to a contact plate (303). The contact plate (303) is made of a flexible material and its hardness is less than that of a wire rod.

4. The stator bar ejection device for a hydro-generator set according to claim 3, characterized in that, An interlayer spacer (6) is provided between the upper layer bar (7) and the lower layer bar (8), and a flexible protective layer (204) is provided at the bottom of the wedge-shaped ejector (2).

5. The method for ejecting stator bars of a hydro-generator set using the ejection device of claim 4, characterized in that, The steps for ejection are as follows: Step 1: First, use a tool to pull up the end of the bar so that the bar protrudes from the iron core and expands a wedge-shaped gap between the upper bar (7) and the lower bar (8); Step 2: Insert the wedge-shaped ejector (2) into the wedge-shaped gap with the tip facing downwards; Step 3: Start the electric hydraulic pump (1) and use the oil pressure to slowly push out the upper end of the bar. As the bar is pushed out, the wedge gap becomes larger, and the wedge ejector (2) can slowly fall down. Step 4: Adjust the position of the back pressure device (3) downwards, following the wedge ejector (2); Step 5: Continue to control the electric hydraulic pump (1) to push out the middle of the bar until the entire bar is pushed out.

6. The ejection method according to claim 5, characterized in that, In step three, the valve body inside the electric hydraulic pump (1) continuously changes position, causing one of the ejection cylinder (203) and the back pressure cylinder (301) to eject while the other is unloaded. The ejection cylinder (203) and the back pressure cylinder (301) work alternately to eject and back pressure the upper bar (7), and the ejection is the end.

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