Grinding device for steam valve bonnet of steam turbine

Abstract

The utility model provides a grinding device for a steam valve cover of a steam turbine, which comprises a connecting rod, a grinding wheel, a grinding wheel and a grinding wheel, the grinding disc is coaxially butted to the end, away from the handle, of the connecting rod, an adjusting groove is formed in the grinding disc and is in sliding fit with a sliding block, one side of the sliding block protrudes out of the end face of the grinding disc to install a grinding piece, and the sliding block can slide along the adjusting groove to change the radial distance between the sliding block and the axis of the connecting rod; the pressing disc is coaxially connected and fixed to the sleeve, and a sliding groove matched with the fastener is formed in the pressing disc. The position-adjustable sliding block is arranged on the grinding disc, the abrasive paper is pasted on the sliding block, and the radial position, relative to the grinding disc, of the grinding element formed by combining the sliding block with the abrasive paper is adjusted, so that when the grinding disc rotates, the grinding element forms the working range matched with the annular sealing face and is matched with the sealing faces of different sizes, and the universality of the grinding disc is improved.

Description

Technical Field

[0001] The utility model relates to the field of steam turbine maintenance tools, and particularly relates to a grinding device for the steam valve cover of a steam turbine. Background Art

[0002] Each steam turbine generator unit is provided with a steam distribution mechanism for high-pressure main steam valves, high-pressure governing valves, intermediate-pressure main steam valves, and intermediate-pressure regulating valves. They are important regulating and actuating mechanisms and protection devices for steam turbines. When the unit runs overspeed or an emergency occurs, they can quickly cut off the steam inlet to the intermediate-pressure cylinder of the steam turbine. Therefore, whether the sealing performance of the steam valve cover of the steam distribution mechanism is safe and reliable is the guarantee for the safe operation of the steam turbine.

[0003] The common shape of the sealing surface of the steam valve cover is an annular surface, and the sealing is achieved by the contact between the sealing surfaces of the valve cover and the valve body. If the sealing surface is damaged, worn, or deformed due to long-term use or improper operation, resulting in a decline in the sealing performance, then it is necessary to perform grinding to repair the sealing surface. There may be defects such as cracks and scratches on the sealing surface, which will cause leakage or medium penetration and affect the working effect of the valve. These defects can be repaired by grinding to improve the sealing performance of the valve. A device for repairing the sealing surface of a steam turbine valve seat is disclosed in Chinese Patent (Publication No.: CN218017744U), which uses an elastic grinding stone that can automatically adapt to the internal dimensions of the sealing surface and can also adapt to the thickness of the scale, and all the scale is ground off. The grinding stone is pressed against the scale under the action of a spring and centrifugal force to grind off the scale. However, its adaptability to steam valve covers of different sizes is poor, and it is difficult to accurately match the sealing surfaces of different sizes, resulting in insufficient versatility. Summary of the Utility Model

[0004] The purpose of the utility model is to address the defects existing in the prior art and provide a grinding device for the steam valve cover of a steam turbine. A chute is provided on the pressure plate, and a fastener can pass through the chute to fix the pressure plate, and different steam valve seats can be adapted by the fastener being in different positions of the chute. The slider with an adjustable position on the grinding disc has sandpaper pasted on it, and the radial position of the grinding element formed by adjusting the slider and the sandpaper relative to the grinding disc is adjusted, so that when the grinding disc rotates, the grinding element forms a working range that adapts to the circular ring-shaped sealing surface, adapts to the sealing surfaces of different sizes, and improves its versatility.

[0005] To achieve the above purpose, the following technical solutions are adopted:

[0006] A grinding device for the steam valve cover of a steam turbine, comprising:

[0007] A connecting rod is coaxially sleeved with an outer sleeve outside, the outer sleeve is rotationally matched with the connecting rod, and one axial end of the connecting rod passes through the outer sleeve and is connected with a handle;

[0008] The grinding disc is coaxially butted to one end of the connecting rod away from the handle. An adjustment groove is provided on the grinding disc. A slider is slidably engaged with the adjustment groove. One side of the slider protrudes from the end face of the grinding disc to mount a grinding element. The slider can slide along the adjustment groove to change the radial distance between the slider and the axis of the connecting rod;

[0009] The pressure plate is coaxially connected and fixed to the sleeve. A chute for cooperating with a fastener is provided on the pressure plate.

[0010] Further, a plurality of adjustment grooves are provided on the grinding disc and are circumferentially and spaced apart around the connecting rod. Each adjustment groove is slidably engaged with a slider respectively. The grinding element is mounted on the side of the slider away from the grinding disc.

[0011] Further, the adjustment groove is distributed radially on the grinding disc.

[0012] Further, three chutes are provided on the pressure plate and are circumferentially and spaced apart around the sleeve. Each chute is respectively engaged with a fastener, and the fastener abuts against the end face of the pressure plate.

[0013] Further, the chute is distributed radially on the pressure plate, and the chute axially penetrates the pressure plate along the axis of the pressure plate.

[0014] Further, a bearing is sleeved on the connecting rod. The inner ring of the bearing is connected to the outer circumferential wall of the connecting rod, and the outer ring of the bearing is connected to the inner circumferential wall of the sleeve.

[0015] Further, two bearings are provided at intervals in the sleeve to maintain the coaxial distribution and axial position of the connecting rod and the sleeve.

[0016] Further, in the axial direction of the connecting rod, the sleeve and the pressure plate are located between the grinding disc and the handle. The pressure plate is sleeved on the outside of the sleeve and fixed to the sleeve.

[0017] Further, the handle is of an annular structure and is coaxially connected to the connecting rod.

[0018] Further, the grinding element is sandpaper, and the sandpaper is detachably mounted on the slider.

[0019] Compared with the prior art, the advantages and positive effects of the present utility model are:

[0020] (1) Aiming at the problem of poor versatility of the current grinding tool for the sealing surface of the steam valve seat, a chute is provided on the pressure plate. The fastener can pass through the chute to fix the pressure plate, and different steam valve seats can be adapted by the fastener at different positions in the chute. The slider with adjustable position on the grinding disc has sandpaper pasted on it. The radial position of the grinding element formed by the combination of the slider and the sandpaper relative to the grinding disc is adjusted, so that when the grinding disc rotates, the grinding element forms a working range adapted to the circular ring-shaped sealing surface, adapting to sealing surfaces of different sizes and improving its versatility.

[0021] (2) By providing a plurality of sliding grooves on the pressure plate and respectively cooperating with fasteners, the pressure plate is connected to the steam valve seat from multiple positions, ensuring the stability of the pressure plate, enabling the pressure plate and the connected sleeve to guide and radially restrict the connecting rod. The handle drives the grinding disc to rotate through the connecting rod, thereby driving the slider and the sandpaper to rotate around the axis of the connecting rod. The sandpaper forms an annular grinding track adapted to the sealing surface, ensuring the grinding accuracy.

[0022] (3) The sleeve is adapted to the connecting rod through two bearings, enabling the connecting rod and the sleeve to be coaxially distributed and capable of relative rotation. After the sleeve is fixed in position by the pressure plate, it can accurately position and guide the connecting rod, ensuring its motion accuracy. Description of the Drawings

[0023] The specification drawings forming a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0024] Figure 1 It is a schematic diagram of a grinding device for a steam turbine valve cover in an embodiment of the present utility model.

[0025] In the figure, 1. Handle, 2. Connecting rod, 3. Pressure plate, 4. Bearing, 5. Sleeve, 6. Grinding disc, 7. Sliding groove, 8. Adjusting groove, 9. Slider. Detailed Embodiment

[0026] In a typical embodiment of the present utility model, as Figure 1 shown, a grinding device for a steam turbine valve cover is proposed.

[0027] Currently, the grinding equipment for the steam valve seat is difficult to adapt to the sealing surface of the steam valve cover, resulting in a low grinding efficiency of the steam valve cover. Based on this, this embodiment provides a grinding device for a steam turbine valve cover, which uses the connecting rod 2 to associate the actions of the handle 1 and the grinding disc 6. The grinding disc 6 is provided with a slider 9 capable of adjusting the radial position, enabling the grinding disc 6 to drive the slider 9 to rotate around the axis during rotation. The slider 9 follows the grinding disc 6 to form an annular motion track, and the grinding member provided on the slider 9 can accurately match and grind the circular sealing surface; moreover, when the slider 9 adjusts its position, the grinding member can grind circular sealing surfaces of different sizes, improving its versatility.

[0028] As Figure 1As shown, the grinding device for the steam turbine valve cover mainly includes a connecting rod 2, a handle 1, a grinding disc 6 and a pressure disc 3. One end of the connecting rod 2 is connected to the handle 1, and the other end is butted against the grinding disc 6, so that the handle 1, the connecting rod 2 and the grinding disc 6 can rotate synchronously. A sleeve 5 is rotatably sleeved outside the connecting rod 2, and the sleeve 5 is connected to the pressure disc 3. The pressure disc 3 is connected to the steam turbine valve cover to maintain the position of the pressure disc 3, so that the sleeve 5 can maintain a stable guiding effect on the connecting rod 2, and the grinding disc 6 can rotate stably during operation. A slider 9 installed on the grinding disc 6 is matched with a grinding part. The grinding part can grind the circular sealing surface when the grinding part rotates, improving the sealing performance.

[0029] The connecting rod 2 serves as the main shaft of the entire grinding device. It passes through the sleeve 5 from one end and is connected to the handle 1, and the other end is located outside the sleeve 5 and butted against the grinding disc 6. This allows the operator to drive the rotation of the connecting rod 2 through the handle 1, and then drive the grinding disc 6 to work.

[0030] The sleeve 5 is coaxially sleeved outside the connecting rod 2, achieving rotational fit with the connecting rod 2, enabling the connecting rod 2 to freely rotate around its axis within the sleeve 5, while the sleeve 5 itself remains fixed, providing a stable constraint for the grinding disc 6.

[0031] The grinding disc 6 is coaxially butted against one end of the connecting rod 2 away from the handle 1 and is the component actually performing the grinding work. The grinding disc 6 is provided with an adjustment groove 8 for installing and adjusting the slider 9. The adjustment groove 8 allows the slider 9 to slide and adjust its position in the radial direction, thereby changing the radial distance between the slider 9 and the axis of the grinding disc 6. When the grinding disc 6 rotates, the slider 9 rotates around the axis of the grinding disc 6 to form a circular trajectory, and the diameter of this circular trajectory is adjusted according to the change in the radial position of the slider 9 relative to the grinding disc 6 to adapt to sealing surfaces of different sizes.

[0032] The slider 9 is slidably fitted in the adjustment groove 8, and one side of it protrudes from the end face of the grinding disc 6 for installing the grinding part. The grinding part can be sandpaper, a plate with a grinding surface, etc. Taking sandpaper as an example, the sandpaper is detachably installed on the slider 9, and the sealing surface is ground by replacing sandpaper with different mesh numbers. By adjusting the position of the slider 9, the radial distance between the grinding part and the axis of the connecting rod 2 can be changed, thus achieving precise grinding of sealing surfaces of different sizes.

[0033] It can be understood that by adjusting the positions of the slider 9 and the grinding part, the convex surface of the steam turbine valve cover and the concave surface of the valve body can be ground until the surface parallelism and surface finish meet the overhaul quality process standards.

[0034] The pressure plate 3 is coaxially connected and fixed to the sleeve 5, which plays a role in stabilizing the combination of the sleeve 5 and the connecting rod 2; a sliding groove 7 is provided on the pressure plate 3 for cooperating with fasteners. The fasteners can be bolts or screws, and the fasteners can move within the sliding groove 7 to change their positions. After reaching the appropriate positions, they are connected to the preset threaded holes on the steam valve cover, etc., to adapt the pressure plate 3 to different types of steam valve seats.

[0035] Traditional grinding devices often can only grind sealing surfaces of specific sizes, lacking flexibility. Through the free sliding of the slider 9 in the adjustment groove 8 and the adjustability of the fasteners in the sliding groove 7, this device realizes the adaptation to sealing surfaces of different sizes, greatly improving the versatility of the device. By controlling the rotation of the connecting rod 2 through the handle 1, the grinding operation process is simplified, enabling the operator to complete the grinding task more easily.

[0036] Since the positions of the slider 9 and the grinding parts can be precisely adjusted as needed, high-precision grinding of sealing surfaces of different sizes can be achieved. The device can adapt to various types of steam valve seats, reducing the need to replace different grinding devices and lowering costs. The operation is simple, the grinding process is fast and accurate, improving work efficiency.

[0037] As Figure 1 shown, a plurality of adjustment grooves 8 are circumferentially and spacedly distributed around the connecting rod 2 on the grinding disc 6. By installing and adjusting a plurality of sliders 9 at different positions on the grinding disc 6, the sealing surfaces in different areas can be ground simultaneously or separately, improving work efficiency and the flexibility of grinding. The adjustment grooves 8 are radially distributed along the grinding disc 6, enabling the sliders 9 to slide radially and adjust the distance of the grinding parts relative to the axis of the connecting rod 2 to adapt to sealing surfaces of different diameters. In this embodiment, there are three adjustment grooves 8, and the three sliders 9 correspond to the three adjustment grooves 8 one by one and form sliding fits respectively.

[0038] Each adjustment groove 8 has a slider 9 in sliding fit, and a grinding part (such as sandpaper) is installed on the side of the slider 9 away from the grinding disc 6. This enables the grinding part to closely adhere to the sealing surface for grinding, and at the same time, the adjustability of the slider 9 ensures the accuracy of grinding.

[0039] Before and after the slider 9 moves along the adjustment groove 8, it needs to maintain a stable position, so as to keep the positions of the slider 9 and the grinding parts fixed relative to the grinding disc 6 during the grinding operation. For this, locking screws or similar fasteners can be designed on the slider 9. After the slider 9 is adjusted to the required position, the slider 9 is fixed by rotating the locking screw to prevent it from moving. In other alternative embodiments, a spring locking mechanism can also be equipped inside or outside the slider 9. When the slider 9 moves to the appropriate position, the spring locking mechanism will be triggered automatically or manually to lock the slider 9 in place.

[0040] As Figure 1As shown in the figure, three chutes 7 are provided on the pressure plate 3, which are circumferentially and spaced apart around the sleeve 5. Each chute 7 is respectively fitted with a fastener. By adjusting the position of the fastener in the chute 7 to adapt to valve seats of different models, the versatility of the device is enhanced. The chute 7 is not only distributed radially along the pressure plate 3, but also axially penetrates the pressure plate 3 along the pressure plate 3, so that the fastener can firmly fix the pressure plate 3 and allow it to be finely adjusted within a certain range.

[0041] A bearing 4 is sleeved outside the connecting rod 2. The inner ring of the bearing 4 is connected to the outer circumferential wall of the connecting rod 2, and the outer ring is connected to the inner circumferential wall of the sleeve 5. The friction between the connecting rod 2 and the sleeve 5 is reduced, the smoothness of rotation is ensured, and the coaxial distribution and axial position of the connecting rod 2 and the sleeve 5 are maintained. Two bearings 4 are arranged at intervals inside the sleeve 5 to maintain the coaxial distribution and axial position of the connecting rod 2 and the sleeve 5, further enhancing the stability between the connecting rod 2 and the sleeve 5 and preventing vibration and deviation caused by rotation.

[0042] Axially on the connecting rod 2, the sleeve 5 and the pressure plate 3 are located between the grinding disc 6 and the handle 1. The pressure plate 3 is sleeved outside the sleeve 5 and fixed to the sleeve 5. This layout makes the whole device structure compact and easy to operate. The handle 1 is designed as an annular structure and is coaxially connected to the connecting rod 2. It improves the comfort of holding and also enhances the strength and stability of the handle 1.

[0043] In this embodiment, the pressure plate 3 is of a disc-shaped structure, and the grinding disc 6 is also of a disc-shaped structure. The pressure plate 3, the grinding disc 6, the sleeve 5 and the connecting rod 2 are coaxially distributed.

[0044] The abrasive parts such as sandpaper adopted are detachably installed on the slider 9. For example, sandpaper with an adhesive backing can be used, which is convenient for replacing sandpaper of different grits to meet different grinding requirements, and at the same time is convenient for the maintenance and replacement of the sandpaper. After each grinding, replace the sandpaper with a higher mesh number according to the requirements. After replacing sandpaper of different mesh numbers and applying pressure multiple times, the sealing surface of the valve cover can quickly reach the flatness and surface finish that meet the overhaul quality process standards.

[0045] Through the design of multiple adjustment slots 8 and the slider 9, the function of multi-point grinding is realized, and the flexibility and efficiency of grinding are improved. Through the cooperation of the chute 7 on the pressure plate 3 and the fastener, and the adjustability of the slider 9 on the grinding disc 6, the adaptability of the device to valve seats of different models is enhanced.

[0046] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A grinding device for the steam turbine valve cover, characterized in that Comprising: A connecting rod, with a sleeve coaxially sleeved outside, the sleeve is rotationally fitted with the connecting rod, and one axial end of the connecting rod passes through the sleeve and is connected with a handle; A grinding disc, coaxially butted at one end of the connecting rod away from the handle, the grinding disc is provided with an adjusting groove, the adjusting groove is slidably fitted with a slider, one side of the slider protrudes from the end face of the grinding disc to mount a grinding member, and the slider can slide along the adjusting groove to change the radial distance between the slider and the axis of the connecting rod; A pressure disc, coaxially connected and fixed to the sleeve, the pressure disc is provided with a chute for fitting a fastener.

2. The steam turbine valve cover grinding device according to claim 1, wherein The grinding disc is provided with a plurality of adjusting grooves circumferentially spaced around the connecting rod, each adjusting groove is slidably fitted with a slider, and the grinding member is mounted on the side of the slider away from the grinding disc.

3. The steam turbine valve cover grinding device according to claim 1 or 2, characterized in that, The adjusting groove is distributed radially on the grinding disc.

4. The steam turbine valve cover grinding device according to claim 1, characterized in that, The pressure disc is provided with three chutes circumferentially spaced around the sleeve, each chute is respectively fitted with a fastener, and the fastener abuts against the end face of the pressure disc.

5. The steam turbine valve cover grinding device according to claim 1 or 4, characterized in that, The chute is distributed radially on the pressure disc, and the chute axially penetrates the pressure disc along the axis of the pressure disc.

6. The turbine steam valve cover grinding device according to claim 1, characterized in that, A bearing is sleeved outside the connecting rod, the inner ring of the bearing is connected to the outer circumferential wall of the connecting rod, and the outer ring of the bearing is connected to the inner circumferential wall of the sleeve.

7. The turbine steam valve cover grinding device according to claim 6, characterized in that, Two bearings are arranged at intervals inside the sleeve to maintain the coaxial distribution and axial position of the connecting rod and the sleeve.

8. The turbine steam valve cover grinding device according to claim 1, characterized in that, Axially on the connecting rod, the sleeve and the pressure disc are located between the grinding disc and the handle, and the pressure disc is sleeved outside the sleeve and fixed to the sleeve.

9. The turbine steam valve cover grinding device according to claim 1 or 8, characterized in that, The handle is of an annular structure and is coaxially connected to the connecting rod.

10. The steam turbine valve cover grinding device according to claim 1, characterized in that, The grinding member is sandpaper, and the sandpaper is detachably mounted on the slider.

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