A steam turbine front cylinder fine machining device

Abstract

The application discloses a steam turbine front cylinder fine machining device, relates to the technical field of fine machining devices, and adds an inclined slide plate, a turnover plate and a clamping table on the basis of a conventional fine machining device. The three structures are provided with independent action structures. The turnover plate is independently deflected in a longitudinal direction, and the inclined slide plate is independently deflected in a transverse direction. The purpose is to adopt a one-step clamping positioning process for the machining of large objects such as front cylinders, and the positioning and leveling do not need to be adjusted multiple times by workers. The bidirectional movement of the displacement sensor in four positions is used as reference data in the transverse deflection process. The purpose is to shorten the arm distance in the transverse deflection process by using the lever principle, and further simplify the overall positioning and leveling process.

Description

Technical Field

[0001] This invention relates to the field of precision machining equipment technology, specifically to a precision machining equipment for the front cylinder of a steam turbine. Background Technology

[0002] For the front cylinder of a steam turbine, the verticality error requirement is no greater than 0.05mm / m, the roundness error is no greater than 0.03mm, and the taper error is no greater than 0.03mm / m. It is a high-precision product, and the processing technology is mainly precision machining.

[0003] It should be noted that the difference between finish turning and rough turning lies in the tool path and entry point, which aim to improve machining accuracy. While ensuring the accuracy of the tool path program, it is also necessary to further ensure the machining position of the turbine front cylinder. The turbine front cylinder has a complex structure (working surface and non-working surface), which increases the complexity of the clamping process. The conventional method is to use the lathe tool head for multi-point positioning and make multiple fine adjustments to the workpiece based on the tool head position information. However, the turbine front cylinder is a large workpiece. If the clamping position of the turbine front cylinder is made into multiple fine adjustments, the process is quite complex and requires the cooperation of multiple personnel, which takes a long time and extends the overall machining cycle. This application proposes a solution to this problem. Summary of the Invention

[0004] The purpose of this invention is to provide a precision machining equipment for the front cylinder of a steam turbine. In the precision machining process of the front cylinder of a steam turbine, due to the relatively complex structure of the front cylinder, it is necessary to make multiple fine adjustments to the clamping position of the front cylinder, which is a relatively complicated and time-consuming process, thereby extending the overall machining cycle and even affecting the machining accuracy.

[0005] The objective of this invention can be achieved through the following technical solution: a precision machining equipment for the front cylinder of a steam turbine, comprising a machine tool assembly, the machine tool assembly comprising a worktable and a machine head, wherein a tilting plate, an inclined slide plate and a clamping table are sequentially arranged on the worktable from top to bottom, a clamping assembly is provided on the inclined slide plate, and a lateral deflection structure is provided between the inclined slide plate and the tilting plate, and a longitudinal deflection structure is provided between the clamping table and the inclined slide plate; The clamping assembly includes a second motor assembly and a fixed bearing. The lateral deflection structure includes a gear column, a mounting sleeve, and a first motor assembly. The longitudinal deflection structure includes a triangular link, a straight slide plate, a second hydraulic structure, and a third motor assembly. The tilting plate deflects bidirectionally along the width of the worktable via the lateral deflection structure and the inclined slide plate. The inclined slide plate deflects bidirectionally along the length of the worktable via the longitudinal deflection structure and the clamping table. A vertically positioned displacement sensor is provided at the machine head position. The displacement sensor, the lateral deflection structure, and the longitudinal deflection structure are connected by a horizontal reference system.

[0006] The setting is further configured such that the fixing tile is positioned on the upper surface of the clamping table along the length of the corresponding workbench, and the fixing tile is rotatably connected to the clamping table via the second motor assembly.

[0007] The configuration is further defined as follows: a first hydraulic structure is installed at the four corners of the clamping platform, and a ball joint is installed at the output end of the first hydraulic structure, with the top of the ball joint matching the inclined slide plate.

[0008] Further configured as follows: the lower surface of the flip plate is an arc surface, and a gear part is provided on the lower surface of the flip plate corresponding to the position of the gear post. The setting direction of the gear post is parallel to the length direction of the flip plate, and the gear post is set inside the mounting sleeve and is rotatably connected inside the mounting sleeve through the first motor assembly.

[0009] Further configuration: the upper end of the triangular connector is horizontal and is slidably connected to the inclined slide plate along the length of the workbench, and the lower end of the triangular connector is inverted triangular shape; the straight slide plate is slidably connected in the clamping table along the length of the workbench through a second hydraulic structure. The triangular arm is set in a direction parallel to the width direction of the workbench, and the lower end of the triangular arm is installed at the output end of the third motor assembly.

[0010] The present invention has the following beneficial effects: 1. The overall device is based on the structure of conventional precision machining equipment, with the addition of a slanted slide, a tilting plate, and a clamping table. Each of the three has an independent action structure. Specifically, the tilting plate deflects independently of the clamping table in the longitudinal direction, and the slanted slide deflects independently of both the tilting plate and the clamping table in the lateral direction. Without affecting the clamping of the front cylinder, the upper surface of the front cylinder is brought to a horizontal position through the angular deflection process in two directions. The overall device achieves a "one-step" clamping and positioning process through two sets of action structures, eliminating the need for multiple fine adjustments by operators for positioning and leveling, thus shortening the preparation time during the machining process. 2. Based on the above, the positioning and leveling process mainly relies on the bidirectional movement of the displacement sensor through the machine head. Specifically, it involves bidirectional movement at four positions on the upper surface of the front cylinder. This bidirectional movement includes both lateral and longitudinal directions. The readings on the displacement sensor fluctuate as the probe contacts the upper surface of the front cylinder. In particular, the readings on the displacement sensor are used as reference data during the lateral deflection process. The purpose of this is to shorten the lever arm during the lateral deflection process by utilizing the lever principle, thereby further simplifying the overall positioning and leveling process. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the structure of a precision machining equipment for the front cylinder of a steam turbine proposed in this invention; Figure 2 This is a schematic diagram of the clamping table in a precision machining equipment for the front cylinder of a steam turbine, as proposed in this invention. Figure 3 The present invention provides a precision machining equipment for the front cylinder of a steam turbine. Figure 2 Side view; Figure 4 This is a cross-sectional view of the inclined slide plate in a precision machining equipment for the front cylinder of a steam turbine proposed in this invention; Figure 5 The present invention provides a precision machining equipment for the front cylinder of a steam turbine. Figure 2 A split diagram; Figure 6 This is a schematic diagram of the structure of the tilting plate in a precision machining equipment for the front cylinder of a steam turbine, as proposed in this invention.

[0013] In the diagram: 1. Machine tool assembly; 2. Worktable; 3. Inclined slide; 4. Clamping table; 5. First hydraulic structure; 6. Triangular link; 7. First motor assembly; 8. Second motor assembly; 9. Tilting plate; 10. Fixing block; 11. Straight slide; 12. Third motor assembly; 13. Second hydraulic structure; 14. Mounting sleeve; 15. Gear column; 16. Gear section. Detailed Implementation

[0014] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] Example 1: In the precision machining process of the turbine front cylinder, due to the complex structure of the turbine front cylinder, multiple fine adjustments to the clamping position are required. This process is complex and time-consuming, thus extending the overall machining cycle and even affecting the machining accuracy. The following technical solution is proposed to address this issue: Reference Figures 1-6The turbine front cylinder precision machining equipment in this embodiment includes a machine tool assembly 1, which includes a worktable 2 and a machine head. The worktable 2 is provided with a flip plate 9, a slant slide plate 3 and a clamping table 4 in sequence from top to bottom. The slant slide plate 3 is provided with a clamping assembly, and a lateral deflection structure is provided between the slant slide plate 3 and the flip plate 9. A longitudinal deflection structure is provided between the clamping table 4 and the slant slide plate 3. The clamping assembly includes a second motor assembly 8 and a fixed plate 10. The lateral deflection structure includes a gear column 15, a mounting sleeve 14, and a first motor assembly 7. The longitudinal deflection structure includes a triangular link 6, a straight slide plate 11, a second hydraulic structure 13, and a third motor assembly 12. The flip plate 9 is bidirectionally deflected along the width direction of the worktable 2 by the lateral deflection structure and the inclined slide plate 3. The inclined slide plate 3 is bidirectionally deflected along the length direction of the worktable 2 by the longitudinal deflection structure and the clamping table 4. A vertically arranged displacement sensor is provided at the machine head position. The displacement sensor and the lateral deflection structure and the longitudinal deflection structure are provided with a horizontal reference system. The fixed plate 10 is set on the upper surface side of the clamping table 4 along the length direction of the corresponding worktable 2. The fixed plate 10 is rotatably connected to the clamping table 4 by the second motor assembly 8. A first hydraulic structure 5 is installed at the four corners of the clamping table 4. A ball joint is installed at the output end of the first hydraulic structure 5. The top of the ball joint matches the inclined slide plate 3.

[0016] The lower surface of the flip plate 9 is an arc surface, and a gear part 16 is provided on the lower surface of the flip plate 9 at the position corresponding to the gear column 15. The setting direction of the gear column 15 is parallel to the length direction of the flip plate 9. The gear column 15 is set inside the mounting sleeve 14 and is rotatably connected inside the mounting sleeve 14 through the first motor assembly 7. The upper end of the triangular link 6 is horizontal and is slidably connected to the inclined slide plate 3 along the length direction of the worktable 2. The lower end of the triangular link 6 is inverted triangular. The straight slide plate 11 is slidably connected in the clamping table 4 along the length direction of the worktable 2 through the second hydraulic structure 13. The triangular link 6 is set in a direction parallel to the width direction of the worktable 2, and the lower end of the triangular link 6 is installed at the output end of the third motor assembly 12.

[0017] Basic principle: For the front cylinder of a steam turbine, after machining, it needs to be assembled one by one. During the machining process, the main focus is on its assembly surface and working surface. The front cylinder of a steam turbine is composed of two equally divided half-shafts. In a single machining process, the machining is mainly carried out on one half-shaft. This embodiment mainly focuses on the precision turning process in the machining process. The precision turning process mainly involves the relevant machining steps on the working surface and assembly surface. Taking the conventional front cylinder structure of a steam turbine as an example, the non-working surface is clamped so that the assembly surface and working surface are in the upward position. Then, the corresponding tool is installed on the head position of the machine tool assembly 1 for machining. This part explains the initial position of the front cylinder during the precision turning process. During the clamping process of the front cylinder, because the front cylinder is relatively large in size and weight, it is placed on the clamping platform 9 using a lifting structure, referring to... Figure 3 The second fulcrum serves as the rotation point for the two fixed blocks 10 during their movement, and the two fixed blocks 10 deflect synchronously in the direction closer to the front cylinder, thereby completing the fixation of the front cylinder. The structural shape of the fixed blocks 10 is not described in this invention. It should be noted that the fixed blocks 10 only complete the fixation process of the front cylinder, but cannot meet the adjustment process of the clamping position of the front cylinder. As shown above, the clamping action of the front cylinder is completed by using a hoisting structure. It should also be noted that the horizontal plane formed in the milling process is used as the reference plane in the precision machining process.

[0018] Then refer to Figure 3 and Figure 5 The overall structure is based on the machine tool assembly 1, with the addition of a transverse deflection structure and a longitudinal deflection structure. For example, the flip plate 9 moves along the first fulcrum via the gear column 15, thereby changing the levelness of the upper surface of the front cylinder along the width direction of the worktable 2, and changing the levelness of the upper surface of the front cylinder along the length direction of the worktable 2 through the rotation process of the triangular link 6. This part is the basic principle of the present invention.

[0019] Example 2: This example explains and illustrates the longitudinal deflection structure in Example 1: like Figure 4As shown, each first hydraulic structure 5 provides upward support to the inclined slide plate 3. When the hydraulic stroke in each first hydraulic structure 5 is equal, the inclined slide plate 3 is in a relatively horizontal state. The key technical point in this embodiment is the deflection process of the flip plate 9 in conjunction with the triangular link 6. Its essence is that the triangular link 6 is driven to rotate in an directional manner by the third motor assembly 12. During the directional rotation of the triangular link 6, each first hydraulic structure 5 moves accordingly. However, the difference is that the fulcrum for the triangular link 6 to drive the inclined slide plate 3 to deflect is not fixed. This is to change the angle adjustment method of the inclined slide plate 3 and simplify the operation of each first hydraulic structure 5.

[0020] Example 3: This example describes the horizontal reference system from Example 1: As shown in Embodiment 1, the lateral deflection structure and longitudinal deflection structure rely on the displayed values ​​of the displacement sensor. During operation, the displacement sensor is placed at the head position on the machine tool assembly 1, primarily to orient the upper surface of the front cylinder during the milling process. The displacement sensor needs to move sequentially in both directions at four points on the upper surface of the front cylinder. From the top view of the front cylinder, the bidirectional movement positions include: upper left, lower left, upper right, and lower right. The process includes the following actions: S1: The machine head moves the displacement sensor to a position directly above a specific point, such as the upper left position, and then moves the displacement sensor downwards until its probe continuously contacts the upper surface of the front cylinder. After the displayed value on the displacement sensor reaches K0, K0 is taken as the initial value. Then, the displacement sensor moves along both the transverse (X-direction) and longitudinal (Y-direction) directions for a stroke of L. During this process, the machine tool assembly 1 records the displayed value K of the displacement sensor at this position. i In this manner, the other three locations are simultaneously moved bidirectionally. S2: Regarding the milling process of the front cylinder, it can be understood that the upper surface of the front cylinder is in a relatively horizontal state. If the front cylinder is in an optimal ideal state during the clamping process, the displacement sensor will maintain the displayed value of K0 at any position during the bidirectional movement of the displacement sensor in four locations. However, in reality, there is a deviation in the clamping position of the front cylinder, which causes the displayed value of the displacement sensor at each position to change. The longitudinal movement process is explained as follows: the longitudinal movement distance is L, and (K...) i The maximum absolute value in -K0) can be used to calculate the deflection angle of the front cylinder using the tangent formula in trigonometric functions. Then, the gear column 15 and gear part 16 can be used to drive the flip plate 9 to perform longitudinal leveling on the upper surface of the front cylinder. S3: As shown in S2, the lateral movement process is similar in essence to the longitudinal movement process, but there is a difference: after calculating the deflection angle of the upper surface of the front cylinder relative to the length direction of the worktable 2, it is necessary to further restrict the relative position of the triangular link 6 relative to the inclined slide plate 3. For example, the upper surface of the front cylinder is inclined downward along the direction from left to right, and the inclination angle is a. In this process, the third motor assembly 12 needs to drive the triangular link 6 to rotate counterclockwise by an angle a, so that the upper surface of the front cylinder tends to be horizontal.

[0021] Based on the descriptions in S1 to S3 above, the lateral deflection process of the upper surface of the front cylinder is explained again: the overall device differs from the conventional leveling process in that it uses the relevant parameters of four positions for unified planning, especially in the lateral deflection process. Its essence is to further change the position of the triangular link 6 when it deflects. As shown above, the second hydraulic structure can drive the triangular link 6 on the straight slide plate 11 to move to the right. The purpose is to use the lever principle to shorten the lever arm distance in the lateral deflection process, and cooperate with the first hydraulic structure 5 on both sides to complete the lateral deflection process. The overall process is a "one-step" leveling process, which does not require cumbersome fine-tuning. It only includes the directional rotation of the flip plate 9 and the lateral deflection of the inclined slide plate 3, completing the leveling and positioning in the simplest and most effective way.

[0022] In summary, by adding a slanted slide, a flipping plate, and a clamping platform, these three structures have independent motion mechanisms. Specifically, the flipping plate deflects independently of the clamping platform in the longitudinal direction, and the slanted slide deflects independently of both the flipping plate and the clamping platform in the lateral direction. The purpose is to achieve a "one-step" clamping and positioning process for large components such as front cylinders, eliminating the need for multiple fine-tuning adjustments by operators. This relies on the bidirectional movement of the machine head in four positions driven by displacement sensors. The values ​​displayed by the displacement sensors are used as reference data during the lateral deflection process. This aims to shorten the lever arm distance during the lateral deflection process by utilizing the lever principle, thereby further simplifying the overall positioning and leveling process.

[0023] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

[0024] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0025] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A precision machining equipment for the front cylinder of a steam turbine, comprising a machine tool assembly (1), characterized in that, The machine tool assembly (1) includes a worktable (2) and a machine head. The worktable (2) is provided with a flip plate (9), a slant slide (3) and a clamping table (4) in sequence from top to bottom. The slant slide (3) is provided with a clamping assembly, and a lateral deflection structure is provided between the slant slide (3) and the flip plate (9). The clamping table (4) is provided with a longitudinal deflection structure between the slant slide (3). The clamping assembly includes a second motor assembly (8) and a fixed tile (10). The lateral deflection structure includes a gear column (15), a mounting sleeve (14), and a first motor assembly (7). The longitudinal deflection structure includes a triangular link (6), a straight slide plate (11), a second hydraulic structure (13), and a third motor assembly (12). The flipping plate (9) is bidirectionally deflected along the width direction of the worktable (2) by the lateral deflection structure and the inclined slide plate (3). The inclined slide plate (3) is bidirectionally deflected along the length direction of the worktable (2) by the longitudinal deflection structure and the clamping table (4). A vertically arranged displacement sensor is provided at the machine head position. The displacement sensor and the lateral deflection structure and the longitudinal deflection structure are provided with a horizontal reference system. The upper end of the triangular bracket (6) is horizontal and is slidably connected to the inclined slide plate (3) along the length direction of the workbench (2), and the lower end of the triangular bracket (6) is inverted triangular. The straight slide plate (11) is slidably connected to the clamping table (4) along the length direction of the workbench (2) through the second hydraulic structure (13). The triangular link (6) is set in a direction parallel to the width direction of the workbench (2), and the lower end of the triangular link (6) is installed at the output end of the third motor assembly (12). The third motor assembly (12) drives the triangular link (6) to rotate in an orientation. During the rotation of the triangular link (6), each first hydraulic structure (5) moves accordingly.

2. The precision machining equipment for the front cylinder of a steam turbine according to claim 1, characterized in that, The fixing tile (10) is positioned on the upper surface of the clamping table (4) along the length of the corresponding worktable (2), and the fixing tile (10) is rotatably connected to the clamping table (4) via the second motor assembly (8).

3. The precision machining equipment for the front cylinder of a steam turbine according to claim 1, characterized in that, The clamping platform (4) is equipped with a first hydraulic structure (5) at the four corners, and a ball joint is installed at the output end of the first hydraulic structure (5). The top of the ball joint matches the inclined slide plate (3).

4. The precision machining equipment for the front cylinder of a steam turbine according to claim 1, characterized in that, The lower surface of the flip plate (9) is an arc surface, and a gear part (16) is provided on the lower surface of the flip plate (9) corresponding to the position of the gear column (15). The setting direction of the gear column (15) is parallel to the length direction of the flip plate (9), and the gear column (15) is set inside the mounting sleeve (14) and is rotatably connected inside the mounting sleeve (14) through the first motor assembly (7).

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