Positioning device and positioning method for turbine gilled steam seal ring

Abstract

The application discloses a positioning device and positioning method for turbine inserted tooth steam seal rings with uneven back-arc spring hole distribution, and belongs to the technical field of steam turbines, which comprises a positioning disc, a plurality of positioning holes are formed in the positioning disc, the plurality of positioning holes are distributed along the circumferential direction of a multi-arc segment combined ring workpiece, and are one-to-one corresponding to a plurality of connecting holes arranged on the multi-arc segment combined ring workpiece; a plurality of positioning columns, the plurality of positioning columns are one-to-one corresponding and connected with the plurality of positioning holes, and each positioning column is provided with a positioning surface and a positioning groove; and an adjusting mechanism, the length of the adjusting mechanism is adjustable, by rotating the positioning column, the two ends of the adjusting mechanism can be extended into the positioning grooves on any two positioning columns arranged in the radial direction, so that the connecting holes on the multi-arc segment combined ring workpiece and the positioning grooves on the corresponding positioning column are aligned in the radial direction, and the positioning surface on the corresponding positioning column is in close contact with the corresponding arc segment of the multi-arc segment combined ring workpiece.

Description

Technical Field

[0001] This application belongs to the field of steam turbine technology, specifically relating to a positioning device and positioning method for a toothed steam seal ring for a steam turbine. Background Technology

[0002] In the production process of toothed steam seal rings for steam turbines, to ensure that each steam seal tooth is securely embedded in the seal ring, the entire seal ring is first evenly divided into several arc segments. Next, the steam seal teeth are embedded into the corresponding arc segments and fixed by camber, thus forming the arc segments of the toothed steam seal ring. Finally, multiple such arc segments are assembled into a complete toothed steam seal ring. Because the steam seal teeth of the entire toothed steam seal ring have a machining allowance of 0.2–0.4 mm, when assembling multiple toothed steam seal ring arc segments into a toothed steam seal ring, these arc segments need to be precisely positioned and fixed before the final machining of the steam seal teeth on the entire toothed steam seal ring is completed.

[0003] Existing positioning devices for turbine toothed seal rings mainly consist of a faceted disc with evenly spaced T-slots and a positioning adjustment block fixed to the faceted disc. In operation, the back arc of the seal ring is used as the positioning reference, and the seal ring is tightened and fixed to the positioning adjustment block using screws through the spring holes on the back arc. However, this positioning device for turbine toothed seal rings has extremely poor versatility and is difficult to adapt to diverse production needs. It is only suitable for seal rings with evenly distributed spring holes on the back arc and produced in batches. When encountering seal rings with unevenly distributed spring holes, the pre-made faceted disc with evenly spaced T-slots cannot achieve precise positioning. In this case, to complete the positioning, it is necessary to customize a T-slot faceted disc or a positioning adjustment block with a specific angle. This undoubtedly increases tooling costs significantly and extends the production cycle. Summary of the Invention

[0004] In view of this, this application provides a positioning device and positioning method for turbine toothed steam seal rings with uneven back arc spring hole distribution.

[0005] To achieve the above objectives, this application mainly provides the following technical solutions:

[0006] One aspect of this application provides a positioning device for a toothed steam seal ring for a steam turbine, comprising:

[0007] The positioning disk has multiple positioning holes, which are distributed along the circumferential direction of the multi-arc segment combined annular workpiece and correspond one-to-one with the multiple connecting holes provided on the multi-arc segment combined annular workpiece.

[0008] Multiple positioning posts are provided, and each of the multiple positioning posts is connected to a corresponding positioning hole. Each positioning post is provided with a positioning surface and a positioning groove.

[0009] The adjustment mechanism has an adjustable length. By rotating the positioning column, both ends of the adjustment mechanism can extend into the positioning grooves on any two positioning columns arranged radially opposite each other, thereby aligning the connecting hole on the multi-arc combined annular workpiece with the positioning groove on the corresponding positioning column in the radial direction. At the same time, the positioning surface on the corresponding positioning column fits into the corresponding arc segment in the multi-arc combined annular workpiece.

[0010] Optionally, the positioning device for the turbine toothed steam seal ring further includes:

[0011] A fastening element, one end of which abuts against the side of the positioning post away from the multi-arc segment combined annular workpiece, and the other end passes through the positioning groove on the positioning post and is inserted into the connecting hole of the multi-arc segment combined annular workpiece.

[0012] Optionally, the positioning device for the turbine toothed steam seal ring further includes:

[0013] A washer assembly is disposed between the fastening element and the positioning post on the side opposite to the multi-segment combined annular workpiece.

[0014] Optionally, the washer assembly includes:

[0015] A flat pad is disposed near the positioning post;

[0016] A spring pad is disposed between the flat pad and the head of the fastening element.

[0017] Optionally, the positioning post has an abutment surface on one side opposite to the positioning surface. The abutment surface is a vertical surface and is used to cooperate with the fastening element.

[0018] Optionally, at least a portion of the positioning surface is a curved surface structure, and the radius of curvature of the curved surface structure is equal to the radius of curvature of the corresponding arc segment of the multi-segment combined annular workpiece.

[0019] Optionally, at least a portion of the positioning surface is a planar structure, which is used to support the corresponding arc segments in the multi-arc combined annular workpiece.

[0020] Optionally, the adjustment mechanism includes:

[0021] Stud rod, stud sleeve, and positioning head;

[0022] The screw sleeve is fitted onto the stud rod and is threadedly connected to the stud rod;

[0023] The positioning heads are respectively disposed at the two opposite ends of the stud rod and the screw sleeve, and the positioning heads can be embedded into the positioning grooves on the two positioning posts arranged opposite each other in the radial direction.

[0024] Another aspect of this application provides a positioning method for a turbine toothed steam seal ring, applied to the positioning device for a turbine toothed steam seal ring described in any one of the above claims, the method comprising:

[0025] Multiple positioning holes are made on the positioning plate so that the multiple positioning holes correspond one-to-one with the multiple connecting holes set on the multi-arc combined ring workpiece.

[0026] Install a rotatable positioning pin at each positioning hole;

[0027] Rotate the positioning pins one by one and control the length of the adjustment mechanism so that the two ends of the adjustment mechanism extend into the positioning grooves of the two positioning pins of the corresponding group. After each operation to align the connecting hole on the multi-arc combined ring workpiece with the positioning groove on the corresponding positioning pin in the radial direction is completed, fix the corresponding group of positioning pins.

[0028] Each arc segment of the multi-arc combined ring workpiece is fixed to its corresponding positioning post.

[0029] Optionally, before fixing each arc segment of the multi-arc combined annular workpiece to its corresponding positioning post, the method further includes:

[0030] The positioning surface on the positioning column is machined according to the outer diameter of the multi-segment combined ring workpiece.

[0031] By employing the above technical solution, this application has at least the following beneficial effects:

[0032] The positioning device and method for turbine toothed steam seal rings provided in the embodiments of this application, by opening a series of positioning holes on the positioning plate along the circumferential direction of the multi-arc segment combined annular workpiece, corresponding one-to-one with the connecting holes on the multi-arc segment combined annular workpiece, can ensure that the positioning pins installed at the positioning holes of the positioning plate are laid out completely according to the actual distribution of the connecting holes on the multi-arc segment combined annular workpiece. This provides the prerequisite for the precise radial alignment of the positioning grooves on the positioning pins with the connecting holes on the corresponding arc segments of the multi-arc segment combined annular workpiece during subsequent positioning operations. This improves the versatility and adaptability of the positioning device for turbine toothed steam seal rings, and can easily handle multi-arc segment combined annular workpieces with uniform or complex distribution of connecting holes, effectively meeting diverse production needs and providing a strong guarantee for efficient and accurate positioning in the production process. Furthermore, by rotating the positioning column and adjusting the adjustment mechanism, the positioning groove on the positioning column can be aligned with the corresponding connecting hole on the arc segment of the multi-arc combined annular workpiece. The operation is relatively simple, without the need for complicated installation and adjustment processes, and without the need to customize complex tooling for different workpieces. This reduces the difficulty of operation and tooling costs, and improves production efficiency. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the adjustment mechanism in the working state according to an optional embodiment of this application;

[0034] Figure 2 This is a schematic diagram of a positioning post from one viewpoint of an optional embodiment of this application;

[0035] Figure 3 This is a schematic diagram of the positioning post from another perspective, representing an alternative embodiment of this application.

[0036] Figure 4 An exploded view of the adjustment mechanism of an optional embodiment of this application;

[0037] Figure 5 This is a schematic diagram of the positioning device for a turbine toothed steam seal ring in working state, according to an optional embodiment of this application.

[0038] Figure 6 This is a flowchart of a positioning method for a turbine toothed steam seal ring, which is an optional embodiment of this application.

[0039] The reference numerals in the attached figures are as follows:

[0040] 1. Positioning plate; 11. Positioning hole; 2. Positioning pin; 21. Positioning surface; 211. Curved surface structure; 212. Planar structure; 22. Positioning groove; 23. Abutment surface; 3. Adjustment mechanism; 31. Stud rod; 32. Screw sleeve; 33. Positioning head; 4. Fastening element; 5. Washer assembly; 6. Multi-arc combined ring workpiece. Detailed Implementation

[0041] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0043] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0045] See also Figures 1 to 5As shown in the embodiment of this application, a positioning device for a turbine toothed steam seal ring is provided, comprising: a positioning disk 1, on which a plurality of positioning holes 11 are provided, the plurality of positioning holes 11 being distributed along the circumferential direction of a multi-arc segment combined annular workpiece 6 and corresponding one-to-one with a plurality of connecting holes provided on the multi-arc segment combined annular workpiece 6; a plurality of positioning posts 2, the plurality of positioning posts 2 being respectively connected to the plurality of positioning holes 11, and each positioning post 2 being provided with a positioning surface 21 and a positioning groove 22; and an adjustment mechanism 3, the length of which is adjustable. By rotating the positioning posts 2, both ends of the adjustment mechanism 3 can be extended into the positioning grooves 22 on any set of two positioning posts 2 arranged radially opposite to each other, thereby aligning the connecting holes on the multi-arc segment combined annular workpiece 6 with the positioning grooves 22 on the corresponding positioning posts 2 radially, and simultaneously, the positioning surface 21 on the corresponding positioning post 2 fitting with the corresponding arc segment in the multi-arc segment combined annular workpiece 6.

[0046] In this embodiment, by opening a series of positioning holes 11 on the positioning disk 1 along the circumferential direction of the multi-arc segment combined annular workpiece 6, corresponding one-to-one with the connecting holes on the multi-arc segment combined annular workpiece 6, the positioning pins 2 installed at the positioning holes 11 on the positioning disk 1 can be laid out completely according to the actual distribution of the connecting holes on the multi-arc segment combined annular workpiece 6. This provides the prerequisite for the precise radial alignment of the positioning grooves 22 on the positioning pins 2 with the connecting holes on the corresponding arc segments of the multi-arc segment combined annular workpiece 6 during subsequent positioning operations. This improves the versatility and adaptability of the positioning device for turbine toothed steam seal rings. It can easily handle multi-arc segment combined annular workpieces 6, whether the connecting holes are evenly distributed or complex and varied, effectively meeting diverse production needs and providing a strong guarantee for efficient and accurate positioning in the production process. Here, by rotating the positioning column 2 and adjusting the adjustment mechanism 3, the positioning groove 22 on the positioning column 2 can be aligned with the connecting hole on the corresponding arc segment of the multi-arc combined ring workpiece 6. The operation is relatively simple, without the need for complicated installation and adjustment processes, and without the need to customize complex tooling for different workpieces. This reduces the difficulty of operation and tooling costs, and improves production efficiency.

[0047] Specifically, the multi-arc segment combined annular workpiece 6 is a toothed steam seal ring. The toothed steam seal ring is composed of multiple toothed steam seal ring arc segments, each of which is the arc segment of the multi-arc segment combined annular workpiece 6. The connecting holes on the multi-arc segment combined annular workpiece 6 are represented as spring holes at the back arc of the toothed steam seal ring.

[0048] The positioning disk 1 is the basic part of the entire positioning device for the turbine toothed steam seal ring. It is roughly disc-shaped and has positioning holes 11 machined on it. The positioning holes 11 are used for the subsequent installation of the positioning pin 2. In this embodiment, the positioning pin 2 is connected to the positioning hole 11 by screws. It can be understood that when the screw is not tightened, the positioning pin 2 can rotate relative to the positioning hole 11; when the screw is fully tightened, the positioning pin 2 is firmly fixed at the positioning hole 11 and can no longer rotate, thereby ensuring the stability of the positioning pin 2 during the positioning process.

[0049] Specifically, the positioning plate 1 has multiple positioning holes 11. The number and position of the positioning holes 11 are completely consistent with the connecting holes on the multi-arc combined annular workpiece 6, so that each positioning post 2 installed at the positioning hole 11 can correspond to a connecting hole.

[0050] Each positioning post 2 is provided with a positioning groove 22 and a positioning surface 21. The positioning surface 21 is the part that contacts the arc surface of the multi-arc combined annular workpiece 6, and provides positioning support and constraint by conforming to the workpiece surface; the positioning groove 22 is a structure used to cooperate with the adjustment mechanism 3 to align the connecting holes on the annular workpiece, and plays the role of inserting fastening elements 4 to fix the positioning post 2 to the corresponding arc segment in the multi-arc combined annular workpiece 6 during the positioning process.

[0051] Specifically, the operation steps for aligning the positioning groove 22 with the adjustment mechanism 3 to the connecting holes on the annular workpiece are as follows: First, at each positioning hole 11, a screw is used to connect the positioning post 2 to it, and the screw is adjusted to a loose state, at which point the positioning post 2 can rotate flexibly relative to the positioning hole 11. Next, the length of the adjustment mechanism 3 is adjusted according to the interval between the two positioning posts 2 arranged opposite each other in the radial direction to adapt to the interval. Then, the two positioning posts 2 arranged opposite each other in the radial direction are regarded as a group, and the two ends of the adjustment mechanism 3 are sequentially inserted into the positioning grooves 22 of the same group of positioning posts 2. After the insertion is completed, the screws are tightened to securely lock the positioning post 2 in its current position. Finally, each arc segment of the multi-arc combined annular workpiece 6 is sequentially installed onto the positioning surface 21 of the corresponding positioning post 2. After installation, the fastening element 4 is used to pass through the positioning groove 22 on the positioning post 2 and insert into the connecting hole of the annular workpiece, thereby achieving precise positioning and secure fixation of each arc segment of the multi-arc combined annular workpiece 6.

[0052] Among them, the fastening element 4 can be a bolt, pin, screw, etc., which can tightly connect each arc segment of the multi-arc combined ring workpiece 6 to the positioning post 2 through tightening, driving in, and other operations. This application does not limit this.

[0053] Specifically, in this embodiment, see Figure 5As shown, the fastening element 4 is a hexagonal screw. One end of the hexagonal screw abuts against the side of the positioning post 2 away from the multi-arc segment combined annular workpiece 6, and the other end passes through the positioning groove 22 on the positioning post 2 and is inserted into the connecting hole of the multi-arc segment combined annular workpiece 6. Here, by abutting one end of the hexagonal screw against the side of the positioning post 2 away from the workpiece, and having the other end pass through the positioning groove 22 on the positioning post 2 and be inserted into the connecting hole of the multi-arc segment combined annular workpiece 6, each arc segment of the workpiece can be tightly connected to the positioning post 2, thereby achieving precise positioning and firm fixation of each arc segment of the multi-arc segment combined annular workpiece 6, ensuring that the workpiece will not shift or shake during subsequent processing.

[0054] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 5 As shown, the positioning device for the turbine toothed steam seal ring also includes a washer assembly 5, which is disposed between the fastening element 4 and the positioning post 2 on the side opposite to the multi-arc combined annular workpiece 6.

[0055] In this embodiment, the washer assembly 5 prevents the fastening element 4 from directly contacting the positioning post 2 during tightening, thus preventing damage to the surface of the positioning post 2, such as scratches or wear, and ensuring the surface quality and accuracy of the positioning post 2, thereby extending its service life. Simultaneously, when the fastening element 4 is tightened, the washer assembly 5 can evenly distribute the tightening force across the surface of the positioning post 2, preventing deformation or damage to the positioning post 2 due to excessive local pressure, and improving the structural stability and reliability of the positioning post 2.

[0056] Among them, see Figure 5 As shown, the washer assembly 5 includes a flat washer positioned close to the positioning post 2. This placement increases the contact area between the fastening element 4 and the positioning post 2. When tightening the fastening element 4, the tightening force is more evenly distributed across the surface of the positioning post 2, preventing excessive local pressure and thus avoiding deformation or damage to the surface of the positioning post 2 due to uneven force. Simultaneously, the flat washer acts as an intermediary, isolating the fastening element 4 from the positioning post 2, preventing direct friction between the fastening element 4 and the surface of the positioning post 2 during tightening or loosening. This protects the precision and smoothness of the positioning post 2 surface, extending its service life. Furthermore, the flat washer's thickness compensates for minor height differences between the positioning post 2 and the fastening element 4, ensuring a better fit and a tight connection.

[0057] Among them, see Figure 5As shown, the washer assembly 5 also includes a spring washer, which is positioned between the flat washer and the head of the fastening element 4. Here, the spring washer, positioned between the flat washer and the head of the fastening element 4, provides a certain elastic preload after the fastening element 4 is tightened. When the positioning device for the turbine toothed seal ring is subjected to external forces such as vibration, impact, or temperature changes, the spring washer can absorb and buffer these external forces through its own elastic deformation, preventing the fastening element 4 from loosening and ensuring that the connection between the positioning post 2 and the multi-arc combined annular workpiece 6 remains tight. Simultaneously, the elasticity of the spring washer allows the fastening connection to have a certain degree of self-adaptability. Even under prolonged use or changing operating conditions, it can maintain the stability of the connection, reducing the risk of decreased positioning accuracy or component damage due to loosening, thus improving the reliability and stability of the positioning device for the turbine toothed seal ring.

[0058] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 3 As shown, a contact surface 23 is provided on one side of the positioning post 2 relative to the positioning surface 21. The contact surface 23 is a vertical surface, which is used to cooperate with the fastening element 4.

[0059] In this embodiment, by setting the abutment surface 23 as a vertical surface, a clear and precise positioning reference can be provided when it cooperates with the fastening element 4. It is understood that the verticality and flatness of the vertical surface are relatively easy to ensure, which allows the fastening element 4 to be accurately aligned with the positioning groove 22 on the positioning post 2 and the connecting hole on the multi-arc combined annular workpiece 6 during installation and tightening, ensuring the accuracy and reliability of positioning.

[0060] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 2 As shown, at least a portion of the positioning surface 21 is a curved surface structure 211, and the radius of curvature of the curved surface structure 211 is equal to the radius of curvature of the corresponding arc segment of the multi-arc combined annular workpiece 6.

[0061] In this embodiment, the curved surface structure 211 is perfectly fitted with the corresponding arc segment of the multi-arc combined ring workpiece 6, providing a precise positioning reference for the workpiece during positioning. This ensures that the workpiece is accurately positioned when installed on the positioning post 2, thereby improving positioning accuracy and meeting the high-precision positioning requirements of the multi-arc combined ring workpiece 6 during production. Simultaneously, because the positioning surface 21 perfectly matches the curved surface of the workpiece arc segment, the large contact area between them provides stable support for the multi-arc combined ring workpiece 6. During positioning and subsequent processing, this effectively prevents the workpiece from shaking, shifting, or deforming, ensuring its stability during processing and improving processing quality and product consistency. Furthermore, the tight fit between the positioning surface 21 of the curved surface structure 211 and the workpiece arc segment avoids surface wear or scratches caused by gaps or mismatches between the positioning surface 21 and the workpiece. This is particularly important for multi-arc combined ring workpieces 6 with high surface quality requirements, effectively protecting the workpiece's surface quality and reducing the scrap rate caused by surface damage.

[0062] In this embodiment, the portion of the positioning surface 21 facing the outer edge of the multi-arc combined annular workpiece 6 is a curved surface structure 211.

[0063] Specifically, the shape and curvature of the curved surface structure 211 are determined based on the shape and curvature of the corresponding arc segments of the multi-segment combined annular workpiece 6. Its radius of curvature is equal to the radius of curvature of the corresponding arc segment of the workpiece, so as to ensure that the positioning surface 21 can fit tightly with the workpiece, achieving accurate positioning and stable support. For example, if a segment of the multi-segment combined annular workpiece 6 is an arc with a radius of R, then the corresponding part of the positioning surface 21 is a curved surface with a radius of R that matches the arc.

[0064] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 2 As shown, at least a portion of the positioning surface 21 is a planar structure 212, which is used to support the corresponding arc segments in the multi-arc combined ring workpiece 6.

[0065] In this embodiment, the planar structure 212 provides a flat bearing surface for the corresponding arc segments in the multi-arc composite ring workpiece 6, allowing the workpiece to be stably placed on the positioning surface 21 during the positioning process. This effectively reduces the shaking and displacement of the workpiece during the bearing process, providing a stable foundation for subsequent processing or assembly operations. Simultaneously, the planar structure 212 has a clearly defined geometric shape and boundaries, making it easier for operators to align and position the corresponding arc segments of the workpiece with the planar structure 212 when positioning the multi-arc composite ring workpiece 6. The intuitiveness of the planar structure helps improve the accuracy and efficiency of positioning, especially for workpieces with regular shapes where arc segments easily mate with the planar structure, enabling rapid and precise installation.

[0066] In this embodiment, the portion of the positioning surface 21 facing the bottom surface of the multi-arc combined annular workpiece 6 is a planar structure 212.

[0067] Specifically, when a segment of the multi-segment combined ring workpiece 6 is installed onto the positioning post 2, it needs to be placed on the planar structure 212 of the corresponding positioning surface 21. The planar structure 212 provides a stable placement platform for the segment. The two work together to achieve the positioning of the workpiece and ensure the positional accuracy of the workpiece in subsequent processing or assembly.

[0068] In some possible implementations disclosed in this application, see [link to relevant documentation]. Figure 4 As shown, the adjustment mechanism 3 includes: a stud rod 31, a screw sleeve 32, and a positioning head 33; the screw sleeve 32 is sleeved on the stud rod 31 and threadedly connected to the stud rod 31; the positioning head 33 is respectively disposed at the two opposite ends of the stud rod 31 and the screw sleeve 32, and the positioning head 33 can be embedded into the positioning groove 22 on the two positioning posts 2 arranged opposite each other in the radial direction.

[0069] In this embodiment, through the threaded connection between the stud rod 31 and the screw sleeve 32, when the screw sleeve 32 is rotated, due to the transmission effect of the thread, the screw sleeve 32 will move axially along the stud rod 31, thereby realizing the length adjustment of the entire adjustment mechanism 3.

[0070] Among them, the stud rod 31 is the basic rod-shaped component of the adjustment mechanism 3. One end of it has an external thread, which is used to guide and support the movement of the screw sleeve 32 to determine the movement path of the screw sleeve 32.

[0071] The screw sleeve 32 is a sleeve-shaped part with an internal thread that matches the stud rod 31. In practical applications, the screw sleeve 32 is fitted onto the stud rod 31. Through the threaded engagement with the stud rod 31, it can move axially along the stud rod 31 when rotated, thereby changing the overall length of the adjustment mechanism 3.

[0072] There are two positioning heads 33, which are respectively installed at opposite ends of the stud rod 31 and the screw sleeve 32. The connection method can be male-female mating connection or threaded connection, etc.

[0073] Specifically, in practical applications, after adjusting the length of the adjusting mechanism 3 according to the interval between the two positioning posts 2 arranged radially opposite each other, rotating the two positioning posts 2 in the same group allows the two positioning heads 33 of the adjusting mechanism 3 to be respectively embedded in the positioning grooves 22 of the two positioning posts 2. It should be noted that when the two positioning heads 33 of the adjusting mechanism 3 are respectively embedded in the positioning grooves 22 of the two positioning posts 2, the positioning grooves 22 of the two positioning posts 2 in this group can be aligned with the connecting holes on the corresponding arc segments of the multi-arc combined annular workpiece 6, so that the fastening element 4 can be inserted into the connecting hole of the annular workpiece by passing through the positioning grooves 22 on the positioning post 2, thereby achieving precise positioning and firm fixation of each arc segment of the multi-arc combined annular workpiece 6.

[0074] Furthermore, to fully illustrate the specific implementation process of this embodiment, a positioning method for a turbine toothed steam seal ring is provided, see [link to relevant documentation]. Figure 6 As shown, the method includes:

[0075] Step S101: Multiple positioning holes 11 are made on the positioning plate 1, so that the multiple positioning holes 11 correspond one-to-one with the multiple connecting holes provided on the multi-arc combined ring workpiece 6.

[0076] Here, the positioning disk 1 is the basic part of the entire positioning device for the turbine toothed steam seal ring, and it is roughly disc-shaped. In order to accurately position the multi-arc segment combined annular workpiece 6, positioning holes 11 need to be made on the positioning disk 1 in the same number and position as the actual distribution of the connecting holes on the multi-arc segment combined annular workpiece 6. For example, if there are 10 connecting holes on the multi-arc segment combined annular workpiece 6, then 10 positioning holes 11 are made at the corresponding positions on the positioning disk 1. In this way, each positioning hole 11 corresponds to one connecting hole, providing an accurate installation position for the subsequent installation of the positioning column 2, thus laying the foundation for the entire positioning operation.

[0077] Step S102: Install a rotatable positioning post 2 at each positioning hole 11.

[0078] Here, after the positioning holes 11 are drilled on the positioning plate 1, the positioning pin 2 is installed into the corresponding positioning holes 11. The positioning pin 2 is connected to the positioning holes 11 by screws, and during installation, the screws are adjusted to a loose state. The purpose of this is to allow the positioning pin 2 to rotate flexibly relative to the positioning holes 11, which facilitates subsequent adjustment of the position of the positioning pin 2 according to the specific situation of the multi-arc combined ring workpiece 6, so as to achieve precise positioning. If the screws are tightened, the positioning pin 2 will be firmly fixed in the positioning holes 11, unable to rotate, and therefore unable to be adjusted in position.

[0079] Step S103: Rotate the positioning pins 2 one group at a time and control the length of the adjustment mechanism 3 so that both ends of the adjustment mechanism 3 extend into the positioning grooves 22 of the corresponding two positioning pins 2. After each operation to align the connecting hole on the multi-arc combined ring workpiece 6 with the positioning groove 22 on the corresponding positioning pin 2 in the radial direction is completed, fix the corresponding group of positioning pins 2.

[0080] Here, two positioning posts 2 arranged radially opposite each other are considered as a group. Since the positioning posts 2 are rotatable, each group of positioning posts 2 can be rotated. The purpose of rotating the positioning posts 2 is to adjust the position of the positioning grooves 22 on the positioning posts 2 so that they can be aligned radially with the connecting holes of the corresponding arc segments on the multi-arc combined annular workpiece 6. The adjustment mechanism 3 includes a stud rod 31, a screw sleeve 32, and a positioning head 33. By rotating the screw sleeve 32, the screw sleeve 32 moves axially along the stud rod 31 using the threaded connection between the stud rod 31 and the screw sleeve 32, thereby adjusting the overall length of the adjustment mechanism 3. The length of the adjustment mechanism 3 is adjusted to fit the spacing between the two positioning posts 2 arranged radially opposite each other. After adjusting the length of the adjustment mechanism 3, both ends of the adjustment mechanism 3 are respectively embedded into the positioning grooves 22 of the same group of positioning posts 2. After the two positioning heads 33 of the adjusting mechanism 3 are respectively inserted into the positioning grooves 22 of the two positioning posts 2, the positioning grooves 22 of the two positioning posts 2 can be aligned with the connecting holes on the corresponding arc segments of the multi-arc combined annular workpiece 6. After completing the radial alignment operation between the connecting holes on the multi-arc combined annular workpiece 6 and the positioning grooves 22 on the corresponding positioning posts 2, the screws on the corresponding set of positioning posts 2 are tightened to securely lock the positioning posts 2 in their current positions, preventing the positioning posts 2 from rotating during subsequent operations, thereby ensuring the accuracy of positioning.

[0081] Step S104: Fix each arc segment of the multi-arc combined ring workpiece 6 to the corresponding positioning post 2 one by one.

[0082] Here, after completing the above steps to ensure that the connecting holes on the multi-segment combined annular workpiece 6 are aligned radially with the positioning grooves 22 on the corresponding positioning posts 2 and that the positioning posts 2 are fixed, each arc segment of the multi-segment combined annular workpiece 6 is sequentially installed onto the positioning surface 21 of the corresponding positioning post 2. Then, using fastening elements 4 (such as hexagonal screws), they are passed through the positioning grooves 22 on the positioning posts 2 and inserted into the connecting holes of the annular workpiece, thereby achieving precise positioning and firm fixation of each arc segment of the multi-segment combined annular workpiece 6, ensuring that the workpiece will not shift or shake during subsequent processing or use.

[0083] Furthermore, as a refinement and extension of the specific implementation of the above embodiments, and to fully illustrate the specific implementation process of this embodiment, another positioning method for a turbine toothed steam seal ring is provided, the method comprising:

[0084] Step S201: Multiple positioning holes 11 are made on the positioning plate 1, so that the multiple positioning holes 11 correspond one-to-one with the multiple connecting holes provided on the multi-arc combined ring workpiece 6.

[0085] Step S202: Install a rotatable positioning post 2 at each positioning hole 11.

[0086] Step S203: Rotate the positioning pins 2 one group at a time and control the length of the adjustment mechanism 3 so that both ends of the adjustment mechanism 3 extend into the positioning grooves 22 of the corresponding two positioning pins 2. After each operation to align the connecting hole on the multi-arc combined ring workpiece 6 with the positioning groove 22 on the corresponding positioning pin 2 in the radial direction is completed, fix the corresponding group of positioning pins 2.

[0087] Step S204: Machining the positioning surface 21 on the positioning column 2 according to the outer diameter of the multi-arc combined ring workpiece 6.

[0088] Step S205: Fix each arc segment of the multi-arc combined ring workpiece 6 to the corresponding positioning post 2 one by one.

[0089] In this embodiment, step S204, by machining the positioning surface 21 on the positioning post 2 according to the outer diameter of the workpiece, can make the fit between the positioning post 2 and the workpiece more precise. It should be noted that different multi-segment combined ring workpieces 6 may have different outer diameters, and even workpieces of the same type may have certain dimensional deviations during manufacturing. By machining the positioning surface 21 according to the specific outer diameter of the workpiece, it is possible to ensure that the gap between the positioning post 2 and the workpiece is uniform and minimized, thereby reducing positioning errors, improving positioning accuracy and reliability, and enabling the workpiece to maintain the correct position and orientation during subsequent machining or assembly. Specifically, a suitable positioning surface 21 can better fit the outer surface of the workpiece, providing more stable support and positioning. When the positioning surface 21 of the positioning post 2 matches the outer diameter of the workpiece, the workpiece is placed more stably on the positioning post 2, and is less prone to shaking or displacement. During the machining or assembly of the multi-segment combined ring workpiece 6, it may be subjected to various external forces, such as clamping forces and cutting forces. Stable positioning can effectively resist these external forces, ensuring that the position of the workpiece remains unchanged throughout the process, thereby improving machining quality and assembly accuracy.

[0090] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0091] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A positioning device for a toothed steam seal ring in a steam turbine, characterized in that, include: The positioning disk has multiple positioning holes, which are distributed along the circumferential direction of the multi-arc segment combined annular workpiece and correspond one-to-one with the multiple connecting holes provided on the multi-arc segment combined annular workpiece. Multiple positioning posts are provided, and each of the multiple positioning posts is connected to a corresponding positioning hole. Each positioning post is provided with a positioning surface and a positioning groove. The adjustment mechanism is adjustable in length. By rotating the positioning column, both ends of the adjustment mechanism can extend into the positioning grooves on any set of two positioning columns arranged radially opposite each other, thereby aligning the connecting hole on the multi-arc combined annular workpiece with the positioning groove on the corresponding positioning column in the radial direction. At the same time, the positioning surface on the corresponding positioning column fits into the corresponding arc segment in the multi-arc combined annular workpiece. A fastening element, one end of which abuts against the side of the positioning post away from the multi-arc segment combined annular workpiece, and the other end passes through the positioning groove on the positioning post and is inserted into the connecting hole of the multi-arc segment combined annular workpiece.

2. The positioning device for a turbine toothed steam seal ring according to claim 1, characterized in that, Also includes: A washer assembly is disposed between the fastening element and the positioning post on the side opposite to the multi-segment combined annular workpiece.

3. The positioning device for a turbine toothed steam seal ring according to claim 2, characterized in that, The gasket assembly includes: A flat pad is disposed near the positioning post; A spring pad is disposed between the flat pad and the head of the fastening element.

4. The positioning device for a turbine toothed steam seal ring according to claim 1, characterized in that, The positioning post has an abutment surface on one side opposite to the positioning surface. The abutment surface is a vertical surface and is used to cooperate with the fastening element.

5. The positioning device for a turbine toothed steam seal ring according to claim 1, characterized in that, At least a portion of the positioning surface is a curved surface structure, and the radius of curvature of the curved surface structure is equal to the radius of curvature of the corresponding arc segment of the multi-segment combined annular workpiece.

6. The positioning device for a toothed steam seal ring of a steam turbine according to claim 1, characterized in that, At least a portion of the positioning surface is a planar structure, which is used to support the corresponding arc segments in the multi-arc combined annular workpiece.

7. The positioning device for a turbine toothed steam seal ring according to claim 1, characterized in that, The adjustment mechanism includes: Stud rod, screw sleeve, and positioning head; The screw sleeve is fitted onto the stud rod and is threadedly connected to the stud rod; The positioning heads are respectively disposed at the two opposite ends of the stud rod and the screw sleeve, and the positioning heads can be embedded into the positioning grooves on the two positioning posts arranged opposite each other in the radial direction.

8. A positioning method for a toothed steam seal ring in a steam turbine, characterized in that, The method, applied to the positioning device for a turbine toothed steam seal ring as described in any one of claims 1-7, comprises: Multiple positioning holes are made on the positioning plate so that the multiple positioning holes correspond one-to-one with the multiple connecting holes set on the multi-arc combined ring workpiece. Install a rotatable positioning pin at each positioning hole; Rotate the positioning pins one by one and control the length of the adjustment mechanism so that the two ends of the adjustment mechanism extend into the positioning grooves of the two positioning pins of the corresponding group. After each operation to align the connecting hole on the multi-arc combined ring workpiece with the positioning groove on the corresponding positioning pin in the radial direction is completed, fix the corresponding group of positioning pins. Each arc segment of the multi-arc combined ring workpiece is fixed to its corresponding positioning post.

9. The positioning method for a toothed steam seal ring for a steam turbine according to claim 8, characterized in that, Before fixing each arc segment of the multi-arc combined annular workpiece to its corresponding positioning post, the following is also included: The positioning surface on the positioning column is machined according to the outer diameter of the multi-segment combined ring workpiece.

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