Valve grinding apparatus for steam turbines

Abstract

The utility model discloses a valve grinding device of steam turbine relates to valve grinding machine technical field. Valve grinding device includes the grinding head on valve grinding machine, and the vertical connection of grinding head center position has the guide slide bar, and valve grinding device still includes the guide bush, and the guide bush is fixed in the valve body for guiding the axial movement of guide slide bar, and the guide bush includes the outer support bush and the inner slide bush, and the inner slide bush is fixed in the outer support bush inside coaxially, and the guide slide bar is worn in the inner slide bush and slides in the inner slide bush. The device passes through making the guide bush fixed in the valve inside in advance, and then drives the guide slide bar that sets up on the grinding head part on valve grinding machine to only make the axial movement in the guide bush, to avoid the radial deviation of the grinding head on valve grinding machine in the grinding process, guarantees the parallelism of the grinding head and the grinding surface of valve to keep stable simultaneously, guarantees the precision and quality to valve grinding.

Description

Technical Field

[0001] This utility model relates to the field of valve grinding machine technology, and in particular to a valve grinding device for a steam turbine. Background Technology

[0002] Valve grinding for steam turbines typically requires a valve grinding machine. These machines are used in the oil refining and natural gas industries to repair pipe flanges and valve flanges with octagonal gasket connections. They mainly consist of four parts: power unit, transmission system, grinding head, and support frame. The transmission system includes a drive shaft, input gear pair, and output gear pair, employing a planetary gear reducer structure. This ensures smooth operation and high transmission torque, and features durability, ease of adjustment, and supports pneumatic or electric drive. The grinding process achieves micro-cutting through the relative movement of the grinding tool and the sealing surface.

[0003] Specifically, during the grinding process, the grinding machine needs to be stably fixed so that the grinding tool, i.e., the grinding head, is aligned with the sealing surface for grinding. This sealing surface is generally the valve body flange connection or valve seat, and this location is often an annular plane. The grinding head needs to be kept parallel to this sealing plane to ensure the flatness of the ground surface. This is a key factor in ensuring grinding accuracy and sealing surface quality. Therefore, the operational stability of the valve grinding machine during operation is very important. Although current valve grinding machines use universal joints to connect the grinding shaft and grinding plate, this design allows the grinding shaft to work in a slightly eccentric state. At the same time, centrifugal force causes the grinding plate to move freely, avoiding repeated trajectories and automatically adjusting the parallelism with the sealing surface. However, it still cannot overcome the radial offset or tilt of the grinding plate, i.e., the grinding head, as well as the large displacement of the grinding head due to improper fixing. This will directly affect the grinding accuracy and sealing surface quality of the valve.

[0004] Therefore, based on the above-mentioned technical problems, those skilled in the art urgently need to develop a valve grinding device for steam turbines. Utility Model Content

[0005] The purpose of this invention is to provide a valve grinding device for steam turbines in order to solve the above-mentioned problems.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] This utility model discloses a valve grinding device for a steam turbine, comprising a grinding head located on a valve grinding machine, wherein a guide slide rod is vertically connected to the center of the grinding head.

[0008] The valve grinding device also includes a guide sleeve, which is fixed in the valve body to guide the axial movement of the guide slide rod;

[0009] The guide sleeve includes an outer support sleeve and an inner sliding sleeve. The inner sliding sleeve is coaxially fixed inside the outer support sleeve. The guide slide rod is inserted into the inner sliding sleeve and slides within the inner sliding sleeve. The outer support sleeve is provided with an expansion and fixing mechanism. The expansion and fixing mechanism is used to fix the outer support sleeve inside the valve body by expanding it outward and supporting it on the inner wall of the valve body, and to make the axial direction of the outer support sleeve parallel to the axial direction of the valve body.

[0010] Furthermore, a connecting seat is vertically connected to the center of the grinding head. The connecting seat has a groove, and one end of the guide slide rod is inserted into the groove and radially tightened and fixed by bolts.

[0011] Furthermore, a plurality of circumferentially evenly distributed support frames are provided between the outer surface of the inner sliding sleeve and the inner surface of the outer support sleeve, and the support frames connect the inner sliding sleeve and the outer support sleeve.

[0012] Furthermore, the number of the plurality of support frames is four, and a set of the expansion and fixing mechanisms is provided between each pair of adjacent support frames.

[0013] Furthermore, the expansion and fixing mechanism includes an outer expansion support plate, which is disposed parallel to the side wall of the outer support sleeve outside the outer support sleeve. A moving guide structure is provided between the outer expansion support plate and the outer support sleeve to guide the outer expansion support plate to move radially along the outer support sleeve. An outer expansion moving drive mechanism is provided on the outer support sleeve to drive the outer expansion support plate to move away from the outer support sleeve.

[0014] Furthermore, the movable guide structure includes a horizontal guide rod, and a horizontal guide rod is vertically connected to both the upper and lower ends of the outward expansion support plate. The outer support sleeve has a guide hole on its side wall for the horizontal guide rod to pass through, and the horizontal guide rod slides within the guide hole.

[0015] Furthermore, a limiting stop is connected to one end of the horizontal guide rod that extends into the outer support sleeve, and a compression spring is provided at the other end of the horizontal guide rod that extends into the outer support sleeve. The compression spring is compressed between the limiting stop and the inner wall of the outer support sleeve, and the compression spring is always in a compressed state.

[0016] Furthermore, the outward-expanding movement drive mechanism includes:

[0017] A strip-shaped transmission block, one end of which is vertically connected to the outer expansion support plate and the other end of which extends through the side wall of the outer support sleeve into the outer support sleeve. The side wall of the outer support sleeve has a guide opening for the strip-shaped transmission block to pass through, and the end of the strip-shaped transmission block that extends into the outer support sleeve is set as an upward inclined surface.

[0018] A driving block is disposed inside the outer support sleeve. The driving block has a downward inclined surface on the side facing the strip transmission block. The inclined surface of the driving block and the inclined surface of the strip transmission block are parallel to each other and slide relative to each other.

[0019] A support tube is vertically fixedly connected to the drive block and faces away from the side surface of the strip transmission block;

[0020] A support slide rod is connected to the outer wall of the inner slide sleeve by a bracket. The support slide rod passes through the support tube and slides within the support tube.

[0021] And a horizontal support plate, which is fixedly connected to the upper end of the inner side wall of the outer support sleeve. A tightening screw is provided on the horizontal support plate and is threadedly engaged with it. The tightening screw is set perpendicular to the upper surface of the drive block and is pressed against the upper surface of the drive block.

[0022] In the above technical solution, the valve grinding device for a steam turbine provided by this utility model has the following beneficial effects:

[0023] This device pre-fixes the guide sleeve inside the valve, and then sets a guide slide rod on the grinding head of the valve grinding machine. The guide slide rod moves only axially within the guide sleeve, thus preventing the grinding head from shifting radially during the grinding process. At the same time, it ensures that the grinding head and the grinding surface of the valve maintain a stable parallel relationship, guaranteeing the accuracy and quality of the valve grinding. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0025] Figure 1 A schematic diagram of the structure of a valve grinding device for a steam turbine provided in an embodiment of this utility model;

[0026] Figure 2 A schematic diagram of the guide slide rod connection on the grinding head of a valve grinding device for a steam turbine, provided for an embodiment of this utility model;

[0027] Figure 3 A top view of the strip transmission block and drive block of the outward expansion movement drive mechanism of a valve grinding device for a steam turbine provided in an embodiment of this utility model;

[0028] Figure 4 This is a top view of the horizontal support plate of the outward moving drive mechanism of a valve grinding device for a steam turbine, provided in an embodiment of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Grinding head; 2. Guide slide rod; 3. Outer support sleeve; 4. Inner slide sleeve; 5. Connecting seat; 6. Support frame; 7. Outer support plate; 8. Horizontal guide rod; 9. Limiting stop plate; 10. Compression spring; 11. Strip transmission block; 12. Drive block; 13. Support pipe fitting; 14. Support slide rod; 15. Horizontal support plate; 16. Tightening screw. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0032] Please see Figure 1-4 A valve grinding device for a steam turbine includes a grinding head 1 located on a valve grinding machine. The grinding head 1 is aligned with the part of the valve to be ground for grinding. A guide slide rod 2 is vertically connected to the center of the grinding head 1.

[0033] The valve grinding device for the steam turbine also includes a guide sleeve, which is fixed in the valve body to guide the axial movement of the guide slide rod 2. This restricts the guide slide rod 2 to move only in its axial direction, so as to avoid the grinding head on the valve grinding machine from radially deviating during the grinding process. It also ensures that the grinding head and the grinding surface of the valve maintain a stable parallel relationship during grinding.

[0034] The guide sleeve includes an outer support sleeve 3 and an inner sliding sleeve 4. The inner sliding sleeve 4 is coaxially fixed inside the outer support sleeve 3. The guide slide rod 2 is inserted into the inner sliding sleeve 4 and slides inside the inner sliding sleeve 4. The outer support sleeve 3 is provided with an expansion and fixing mechanism. The expansion and fixing mechanism is used to expand outward of the outer support sleeve 3 and support it on the inner wall of the valve body, so that the outer support sleeve 3 is fixed inside the valve body and the axial direction of the outer support sleeve 3 is parallel to the axial direction of the valve body.

[0035] Specifically, during the use of this device, the guide sleeve is inserted into the valve in advance, and the expansion and fixing mechanism on the outer support sleeve 3 is expanded outward so that it abuts against the inner wall of the valve body to fix the outer support sleeve 3. Then, the guide slide rod 2 is inserted into the inner slide sleeve 4 and slides within the inner slide sleeve 4 to restrict the guide slide rod 2 so that it can only move axially, thereby ensuring the positional stability of the grinding head 1 during grinding.

[0036] It should also be noted that, due to the different valve body structures and grinding positions, there are various models of valve grinding machines in actual applications to perform grinding operations on different positions of the valve body. Therefore, based on the unique structure of this device, it is only used for flat grinding where the guide sleeve has space to extend and be fixed, such as the sealing surface of the valve body flange connection, the internal valve seat position, and the position where the guide sleeve can be installed and then extended into the grinding head 1 for grinding. This implementation method makes this device applicable to a wide range of scenarios.

[0037] Furthermore, a connecting seat 5 is vertically connected to the center of the grinding head 1. The connecting seat 5 has a groove, and one end of the guide slide rod 2 is inserted into the groove. The guide slide rod 2 is radially tightened and fixed by bolts, so as to realize the detachable connection and installation of the guide slide rod 2. This allows for the replacement of guide slide rods 2 of different diameters, and can also be used with guide sleeves of different sizes, making the device more flexible in use.

[0038] Furthermore, multiple circumferentially evenly distributed support frames 6 are provided between the outer surface of the inner sliding sleeve 4 and the inner surface of the outer support sleeve 3 to connect the inner sliding sleeve 4 and the outer support sleeve 3, so as to provide stable and fixed support for the inner sliding sleeve 4.

[0039] Furthermore, there are four support frames 6, and a set of expansion and fixing mechanisms is provided between each pair of adjacent support frames 6. The multiple expansion and fixing mechanisms are arranged evenly in the circumferential direction to stably support and fix the outer support sleeve 3 inside the valve.

[0040] Furthermore, the expansion and fixing mechanism includes an outer expansion support plate 7, which is parallel to the side wall of the outer support sleeve 3 and disposed outside the outer support sleeve 3. A moving guide structure is provided between the outer expansion support plate 7 and the outer support sleeve 3 to guide the outer expansion support plate 7 to move radially along the outer support sleeve 3. An outer expansion moving drive mechanism is provided on the outer support sleeve 3 to drive the outer expansion support plate 7 to move away from the outer support sleeve 3, thereby pressing the outer expansion support plate 7 against the inner wall of the valve to support and fix the outer support sleeve 3 inside the valve.

[0041] Furthermore, the movable guide structure includes a horizontal guide rod 8. A horizontal guide rod 8 is vertically connected to both the upper and lower ends of the outer support plate 7. The outer support sleeve 3 has a guide hole on its side wall for the horizontal guide rod 8 to pass through. The horizontal guide rod 8 slides in the guide hole, so that the movement of the outer support plate 7 is consistent with the movement direction of the horizontal guide rod 8 sliding in the guide hole. This ensures that the outer support plate 7 can remain parallel to the side wall of the outer support sleeve 3. Thus, under the support of the outer support plate 7, the outer support sleeve 3 is kept parallel to the valve body axis, thereby guiding the guide slide rod 2 so that the grinding head 1 remains parallel to the sealing surface.

[0042] Furthermore, a limit stop 9 is connected to one end of the horizontal guide rod 8 that extends into the outer support sleeve 3, and a compression spring 10 is provided at the other end of the horizontal guide rod 8 that extends into the outer support sleeve 3. The compression spring 10 is compressed between the limit stop 9 and the inner wall of the outer support sleeve 3, and the compression spring 10 is always in a compressed state. The compression spring 10 uses its elasticity to push the horizontal guide rod 8 to move so that the outer expansion support plate 7 can be reset, allowing the outer support sleeve 3 to be removed from the valve.

[0043] Furthermore, the extended movement drive mechanism includes:

[0044] A strip-shaped transmission block 11 is vertically connected at one end to the outer expansion support plate 7 and extends through the side wall of the outer support sleeve 3 into the outer support sleeve 3. The side wall of the outer support sleeve 3 has a guide opening for the strip-shaped transmission block 11 to pass through. The end of the strip-shaped transmission block 11 that extends into the outer support sleeve 3 is set as an upward inclined surface.

[0045] Drive block 12 is disposed inside the outer support sleeve 3. A downward inclined surface is provided on the side of drive block 12 facing the bar transmission block 11. The inclined surface of drive block 12 and the inclined surface of bar transmission block 11 are parallel to each other and slide relative to each other.

[0046] Support pipe 13 is vertically fixedly connected to drive block 12 and is opposite to the side surface of strip transmission block 11.

[0047] Support slide rod 14 is connected to the outer wall of inner slide sleeve 4 by bracket. Support slide rod 14 passes through support tube 13 and slides within support tube 13.

[0048] And a horizontal support plate 15, which is fixedly connected to the upper end of the inner side wall of the outer support sleeve 3. A tightening screw 16 is provided on the horizontal support plate 15 and is threadedly engaged with it. The tightening screw 16 is set perpendicular to the upper surface of the drive block 12 and is tightened on the upper surface of the drive block 12.

[0049] Specifically, this structure utilizes the relative sliding movement between the inclined surfaces on the strip-shaped transmission block 11 and the driving block 12 to achieve driving and limiting. Specifically, the threaded tightening screw 16 on the horizontal support plate 15 moves axially during rotation, thereby actuating the driving block 12 to move up and down, thus achieving relative sliding between the two inclined surfaces. This pushes the strip-shaped transmission block 11 to move laterally, and pushes the outer support plate 7 to press against the inner wall of the valve, fixing the outer support sleeve 3. Reverse rotation, under the elastic action of the compression spring 10, resets the outer support plate 7, and the outer support sleeve 3 is removed from the valve.

[0050] In addition, the inclined surface on the bar-shaped transmission block 11 and the inclined surface on the drive block 12 are set at an appropriate angle so that the pushing force of the tightening screw 16 and the elastic force of the compression spring 10 can drive the inclined surface on the bar-shaped transmission block 11 and the inclined surface on the drive block 12 to slide relative to each other.

[0051] In summary, this device pre-fixes the guide sleeve inside the valve, and then drives the guide slide rod on the grinding head of the valve grinding machine to move only axially within the guide sleeve. This prevents the grinding head from radially shifting during the grinding process, while ensuring that the grinding head and the grinding surface of the valve maintain a stable parallel relationship, thus guaranteeing the accuracy and quality of valve grinding.

[0052] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A valve grinding device for a steam turbine, comprising a grinding head (1) located on a valve grinding machine, characterized in that, The center of the grinding head (1) is vertically connected to a guide slide rod (2); The valve grinding device also includes a guide sleeve, which is fixed in the valve body to guide the guide slide rod (2) to move axially; The guide sleeve includes an outer support sleeve (3) and an inner sliding sleeve (4). The inner sliding sleeve (4) is coaxially fixed inside the outer support sleeve (3). The guide slide rod (2) is inserted into the inner sliding sleeve (4) and slides inside the inner sliding sleeve (4). The outer support sleeve (3) is provided with an expansion and fixing mechanism. The expansion and fixing mechanism is used to expand outward of the outer support sleeve (3) and support it on the inner wall of the valve body, so that the outer support sleeve (3) is fixed inside the valve body and the axial direction of the outer support sleeve (3) is parallel to the axial direction of the valve body.

2. The valve grinding device for a steam turbine according to claim 1, characterized in that, The grinding head (1) is vertically connected to a connecting seat (5) at its center position. The connecting seat (5) has a groove. One end of the guide slide rod (2) is inserted into the groove and is radially tightened and fixed by bolts.

3. The valve grinding device for a steam turbine according to claim 1, characterized in that, Multiple support frames (6) are provided between the outer surface of the inner sliding sleeve (4) and the inner surface of the outer support sleeve (3) in a circumferentially uniform manner, and the support frames (6) connect the inner sliding sleeve (4) and the outer support sleeve (3).

4. The valve grinding device for a steam turbine according to claim 3, characterized in that, The number of the multiple support frames (6) is four, and a set of the expansion and fixing mechanism is provided between each two adjacent support frames (6).

5. The valve grinding device for a steam turbine according to claim 1, characterized in that, The expansion and fixing mechanism includes an outer expansion support plate (7), which is parallel to the side wall of the outer support sleeve (3) and disposed outside the outer support sleeve (3). A moving guide structure is provided between the outer expansion support plate (7) and the outer support sleeve (3) to guide the outer expansion support plate (7) to move radially along the outer support sleeve (3). An outer expansion moving drive mechanism is provided on the outer support sleeve (3) to drive the outer expansion support plate (7) to move away from the outer support sleeve (3).

6. The valve grinding device for a steam turbine according to claim 5, characterized in that, The movable guide structure includes a horizontal guide rod (8). The upper and lower ends of the outer support plate (7) are vertically connected to the horizontal guide rod (8). The outer support sleeve (3) has a guide hole on its side wall for the horizontal guide rod (8) to pass through. The horizontal guide rod (8) slides in the guide hole.

7. A valve grinding device for a steam turbine according to claim 6, characterized in that, One end of the horizontal guide rod (8) extending into the outer support sleeve (3) is connected to a limiting baffle (9). A compression spring (10) is provided at one end of the horizontal guide rod (8) extending into the outer support sleeve (3). The compression spring (10) is compressed between the limiting baffle (9) and the inner wall of the outer support sleeve (3). The compression spring (10) is always in a compressed state.

8. A valve grinding device for a steam turbine according to claim 5, characterized in that, The outward-expanding motion drive mechanism includes: A strip-shaped transmission block (11) has one end vertically connected to the outer expansion support plate (7) and the other end extending through the side wall of the outer support sleeve (3) into the outer support sleeve (3). The side wall of the outer support sleeve (3) has a guide opening for the strip-shaped transmission block (11) to pass through. The end of the strip-shaped transmission block (11) extending into the outer support sleeve (3) is set as an upward inclined surface. A drive block (12) is disposed inside the outer support sleeve (3). The drive block (12) has a downward inclined surface on the side facing the strip transmission block (11). The inclined surface of the drive block (12) and the inclined surface of the strip transmission block (11) are arranged parallel to each other and slide relative to each other. Supporting pipe (13), which is vertically fixedly connected to the drive block (12) and opposite to the side surface of the strip transmission block (11); Supporting slide rod (14), the supporting slide rod (14) is connected to the outer wall of the inner sliding sleeve (4) by a bracket, the supporting slide rod (14) passes through the supporting tube (13) and slides in the supporting tube (13); And a horizontal support plate (15), which is fixedly connected to the upper end of the inner side wall of the outer support sleeve (3). A tightening screw (16) is provided on the horizontal support plate (15) and is threadedly engaged with it. The tightening screw (16) is set perpendicular to the upper surface of the drive block (12) and is pressed against the upper surface of the drive block (12).

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