Turbine blade tenon fixing and positioning clamp

Abstract

The utility model discloses a steam turbine blade tenon fixing and positioning clamp, belongs to the technical field of blade machining clamps, and aims to solve the problems that the contact area of a traditional clamp to a fir-tree-shaped tenon is small, and a blade is not easy to rotate according to requirements after being fixed, the steam turbine blade tenon fixing and positioning clamp comprises a base, a clamping seat is rotatably connected to the top end of the base, and a groove is formed in the top end of the clamping seat. Two symmetrically-distributed clamping blocks are slidably connected to the inner wall of the groove, clamping mechanisms are arranged in the two clamping blocks, and a rotating assembly is arranged in the base; the motor is started to drive the two clamping blocks to move towards the two irregular sides of the tenon, the sliding distances of the sliding pressing rods at different positions are different, it is ensured that each sliding pressing rod acts on the fir-tree-shaped tenon, the hand wheel is rotated to drive the worm to rotate, the worm drives the worm wheel to rotate, the rotating shaft drives the whole clamping base to rotate, and the clamping blocks are clamped. And the problems that the contact area of a traditional clamp to the fir-tree-shaped tenon is small, and the blade is not prone to rotating according to needs after being fixed are effectively solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of blade processing fixtures, and in particular relates to a steam turbine blade tenon fixing and positioning fixture. Background Art

[0002] Blades are key parts of steam turbines and are also one of the most delicate and important parts. They withstand high temperature, high pressure, huge centrifugal force, steam force, steam excitation force, corrosion and vibration, as well as water droplet erosion in the wet steam zone under extremely harsh conditions. Their aerodynamic performance, processing geometry, surface roughness, installation clearance, operating conditions, scaling and other factors all affect the efficiency and output of the steam turbine; their structural design, vibration intensity and operating mode have a decisive influence on the safety and reliability of the unit; positioning fixtures are usually used when processing steam turbine blades.

[0003] Most of the existing tenons of steam turbine blades are fir-tree-shaped tenons. When traditional clamps are used to clamp and fix the fir-tree-shaped tenons, due to the irregular characteristics of the outer surface of the fir-tree-shaped tenon, the contact area of ​​the clamp on the fir-tree-shaped tenon is small, and the clamping effect is poor. If a special clamp is customized according to the fir-tree-shaped tenon, the cost is very high. After the traditional clamp fixes the blade, it is not easy to rotate the blade according to processing requirements. The practicality of the clamp is poor. In order to meet the processing requirements, the blade is repeatedly clamped, resulting in low processing efficiency.

[0004] Therefore, a turbine blade tenon fixing and positioning fixture is needed to solve the problems in the prior art that the traditional fixture has a small contact area with the fir-tree-shaped tenon and the blade is not easy to rotate as required after being fixed. Utility Model Content

[0005] The utility model aims to provide a steam turbine blade tenon fixing and positioning fixture to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a steam turbine blade tenon fixing and positioning fixture, comprising a base, a clamping seat is rotatably connected to the top of the base, a groove is provided at the top of the clamping seat, two symmetrically distributed clamping blocks are slidably connected to the inner wall of the groove, a clamping mechanism is arranged inside the two clamping blocks, and a rotating assembly is arranged inside the base;

[0007] The clamping mechanism includes a plurality of evenly distributed cavities, which are opened inside the clamping block. The inner wall of each cavity is slidably connected to a limiting disk. A buffer spring is fixedly connected to an outer wall on one side of the limiting disk. The side of the buffer spring away from the limiting disk is fixedly connected to a side wall inside the cavity. A sliding pressure rod is coaxially fixedly connected to the outer wall on the other side of the limiting disk. The sliding pressure rod slides through the outer wall on one side of the clamping block on the side away from the limiting disk.

[0008] It should be noted in the scheme that the rotating assembly includes an installation cavity, which is opened inside the base, and the bottom surface of the installation cavity is rotatably connected to a rotating shaft, the top end of the rotating shaft rotates through the top end of the base and is fixedly connected to the bottom end of the clamping seat, and a worm gear is tightly sleeved on the outer surface of the rotating shaft, and a worm gear meshing with the worm gear is rotatably connected between the two end walls inside the installation cavity, and the outer wall of one end of the worm gear rotates through one end of the outer surface of the base and is coaxially fixedly connected to a handwheel.

[0009] It is further worth explaining that two parallel sliding grooves are provided on the inner end walls of the groove, each inner wall of the sliding groove is slidably connected with a slider, and the outer walls of one end of the two sliders on the same side are respectively fixedly connected to the outer walls of both ends of a corresponding clamping block.

[0010] It should be further explained that two parallel installation grooves are provided on the inner bottom surface of the groove, and the same bidirectional threaded rod is rotatably connected between the inner side walls of the two installation grooves. A fixing groove is provided on the inner bottom surface of the groove, and a motor is fixedly connected inside the fixing groove. An outer wall on one side of the bidirectional threaded rod rotates through one side wall of the fixing groove and is coaxially fixedly connected to the output end of the motor. Two symmetrically distributed moving blocks are threadedly connected to the outer surface of the bidirectional threaded rod, and the top surfaces of the two moving blocks are respectively fixedly connected to the bottom surfaces of the two clamping blocks.

[0011] As a preferred embodiment, the side of the sliding pressure rod away from the limiting disk is configured to be in an arc shape, and the rotating shaft is coaxial with the base and the clamping seat.

[0012] As a preferred embodiment, the outer walls at both ends of the two moving blocks are slidably connected to the inner end walls of the two mounting grooves respectively, and the bottom end of the base is provided with four mounting columns for mounting on a machine tool.

[0013] Compared with the prior art, the steam turbine blade tenon fixing and positioning fixture provided by the utility model has at least the following beneficial effects:

[0014] (1) Through the action of the clamping mechanism, the motor is turned on to drive the two clamping blocks to move toward the irregular sides of the tenon. After the sliding pressure rod contacts the tenon, it pushes the limit plate to slide in the cavity, so that the buffer spring is forced to contract. The sliding pressure rods at different positions have different sliding distances, ensuring that each sliding pressure rod acts on the fir-tree-shaped tenon, which has a better clamping effect on the tenon and effectively avoids the problem of the small contact area of ​​the traditional clamp on the fir-tree-shaped tenon.

[0015] (2) Through the action of the rotating assembly, the hand wheel is turned to drive the worm to rotate. Under the meshing action, the worm drives the turbine to rotate, so that the rotating shaft drives the clamping seat to rotate as a whole at the top of the base, thereby realizing the rotation adjustment of the fixed blade. The operation is simple and effectively avoids the problem that the blade is difficult to rotate according to the demand after being fixed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the top view of the clamping seat of the utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the clamping mechanism of the utility model;

[0019] Figure 4 It is a schematic diagram of the side cross-sectional structure of the base of the utility model.

[0020] In the figure: 1. base; 2. clamping seat; 3. groove; 4. clamping block; 5. clamping mechanism; 51. cavity; 52. limit plate; 53. buffer spring; 54. sliding pressure rod; 6. rotating assembly; 61. mounting cavity; 62. rotating shaft; 63. worm gear; 64. worm; 65. handwheel; 7. slide groove; 8. slider; 9. mounting groove; 10. bidirectional threaded rod; 11. fixing groove; 12. motor; 13. moving block. DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with embodiments.

[0022] See also Figure 1-Figure 4 The utility model provides a steam turbine blade tenon fixing and positioning fixture, comprising a base 1, a clamping seat 2 is rotatably connected to the top of the base 1, a groove 3 is provided at the top of the clamping seat 2, two symmetrically distributed clamping blocks 4 are slidably connected to the inner wall of the groove 3, a clamping mechanism 5 is arranged inside the two clamping blocks 4, and a rotating component 6 is arranged inside the base 1;

[0023] The clamping mechanism 5 includes a plurality of evenly distributed cavities 51, which are opened inside the clamping block 4. The inner wall of each cavity 51 is slidably connected to a limit plate 52. A buffer spring 53 is fixedly connected to an outer wall on one side of the limit plate 52. The side of the buffer spring 53 away from the limit plate 52 is fixedly connected to a side wall inside the cavity 51. A sliding pressure rod 54 is coaxially fixedly connected to the outer wall on the other side of the limit plate 52. The sliding pressure rod 54 slides through the outer wall on one side of the clamping block 4 away from the side of the limit plate 52.

[0024] Further as Figure 1 and Figure 4As shown, it is worth explaining in detail that the rotating component 6 includes an installation cavity 61, which is opened inside the base 1, and the bottom surface of the installation cavity 61 is rotatably connected with a rotating shaft 62. The top end of the rotating shaft 62 rotates through the top end of the base 1 and is fixedly connected to the bottom end of the clamping seat 2. A worm gear 63 is tightly sleeved on the outer surface of the rotating shaft 62. A worm 64 meshing with the worm gear 63 is rotatably connected between the two end walls inside the installation cavity 61. The outer wall of one end of the worm gear 64 rotates through one end of the outer surface of the base 1 and is coaxially fixedly connected with a handwheel 65.

[0025] Further as Figure 2 and Figure 3 As shown, it is worth explaining in detail that two parallel sliding grooves 7 are provided on the inner end walls of the groove 3, and a slider 8 is slidably connected to the inner wall of each sliding groove 7, and the outer walls of one end of the two sliders 8 located on the same side are respectively fixedly connected to the outer walls of the two ends of a corresponding clamping block 4.

[0026] Further as Figure 2 As shown, it is worth explaining in detail that two parallel installation grooves 9 are provided on the inner bottom surface of the groove 3, and the same bidirectional threaded rod 10 is rotatably connected between the inner side walls of the two installation grooves 9, and a fixing groove 11 is provided on the inner bottom surface of the groove 3, and a motor 12 is fixedly connected inside the fixing groove 11, and the outer wall of one side of the bidirectional threaded rod 10 rotates through one side wall of the fixing groove 11 and is coaxially fixedly connected to the output end of the motor 12, and two symmetrically distributed moving blocks 13 are threadedly connected to the outer surface of the bidirectional threaded rod 10, and the top surfaces of the two moving blocks 13 are respectively fixedly connected to the bottom surfaces of the two clamping blocks 4.

[0027] Further as Figure 1 and Figure 3 As shown, it is worth explaining in detail that the side of the sliding pressure rod 54 away from the limit plate 52 is set to be an arc shape to prevent the outer surface of the blade tenon from being crushed, and the rotating shaft 62 is coaxial with the base 1 and the clamping seat 2 to ensure that the rotation of the clamping seat 2 will not be interfered.

[0028] Further as Figure 1 and Figure 2 As shown, it is worth explaining in detail that the outer walls at both ends of the two moving blocks 13 are respectively slidably connected to the inner end walls of the two mounting grooves 9, so as to improve the movement effect of the moving blocks 13 on the bidirectional threaded rod 10. Four mounting columns for mounting on a machine tool are provided at the bottom end of the base 1, so as to facilitate the installation of the fixture on the machine tool.

[0029] In summary: when the clamp is used, first place the tenon on the blade inside the groove 3 and at the center point of the clamping seat 2, so that the irregular two sides of the fir-tree-shaped tenon correspond to the two clamping blocks 4 respectively, and then turn on the motor 12 to drive the bidirectional threaded rod 10 to rotate. Under the action of the thread, the two moving blocks 13 move toward the center point of the clamping seat 2 in the two installation grooves 9 respectively. Under the cooperation of the slide groove 7 and the slider 8, the two moving blocks 13 drive the two clamping blocks 4 to approach each other, and the plurality of sliding pressure rods 54 on the two clamping blocks 4 are respectively in contact with the two clamping blocks 4. After the irregular two sides of the fir-tree-shaped tenon come into contact with each other, as the two clamping blocks 4 continue to move, the sliding pressure rod 54 is blocked and pushes the limit plate 52 to slide inside the cavity 51, thereby pushing the buffer spring 53 to contract and clamp the fir-tree-shaped tenon. The sliding distances of the sliding pressure rods 54 at different positions are different, ensuring that each sliding pressure rod 54 acts on the fir-tree-shaped tenon, thereby increasing the contact area between the clamping block 4 and the tenon, achieving a better clamping effect on the tenon, and effectively avoiding the problem of the small contact area of ​​the traditional clamp on the fir-tree-shaped tenon.

[0030] When it is necessary to rotate and adjust the blades after clamping, the staff turns the hand wheel 65 to drive the worm 64 to rotate. Through the cooperation of the worm wheel 63 and the worm 64, the rotation of the worm 64 drives the worm wheel 63 to rotate, and then drives the rotating shaft 62 to rotate. The rotating shaft 62 drives the clamping seat 2 to rotate as a whole at the top of the base 1, thereby realizing the rotation adjustment of the fixed blades. The operation is simple, and the problem that the blades are difficult to rotate according to needs after being fixed is effectively avoided.

[0031] The motor 12 can be purchased on the market. The motor 12 is equipped with a power supply, which is a mature technology in this field and has been fully disclosed, so it will not be repeated in the specification.

[0032] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A steam turbine blade tenon fixing and positioning fixture, comprising a base (1), characterized in that: The top of the base (1) is rotatably connected to a clamping seat (2), the top of the clamping seat (2) is provided with a groove (3), the inner wall of the groove (3) is slidably connected to two symmetrically distributed clamping blocks (4), the two clamping blocks (4) are each provided with a clamping mechanism (5), and the base (1) is provided with a rotating assembly (6); The clamping mechanism (5) comprises a plurality of evenly distributed cavities (51), wherein the cavities (51) are arranged inside the clamping block (4), and the inner wall of each cavity (51) is slidably connected to a limiting plate (52), and a buffer spring (53) is fixedly connected to an outer wall on one side of the limiting plate (52), and a side of the buffer spring (53) away from the limiting plate (52) is fixedly connected to a side wall inside the cavity (51), and a sliding pressure rod (54) is coaxially fixedly connected to an outer wall on the other side of the limiting plate (52), and the sliding pressure rod (54) slides through an outer wall on one side of the clamping block (4) on a side away from the limiting plate (52).

2. The steam turbine blade tenon fixing and positioning fixture according to claim 1, characterized in that: The rotating assembly (6) comprises a mounting cavity (61), wherein the mounting cavity (61) is arranged inside the base (1), and the bottom surface of the mounting cavity (61) is rotatably connected to a rotating shaft (62), the top end of the rotating shaft (62) rotatably passes through the top end of the base (1) and is fixedly connected to the bottom end of the clamping seat (2), the outer surface of the rotating shaft (62) is tightly sleeved with a worm gear (63), and a worm (64) meshingly connected to the worm gear (63) is rotatably connected between the two end walls inside the mounting cavity (61), and the outer wall of one end of the worm gear (64) rotatably passes through one end of the outer surface of the base (1) and is coaxially fixedly connected to a hand wheel (65).

3. The steam turbine blade tenon fixing and positioning fixture according to claim 2 is characterized in that: Two parallel sliding grooves (7) are provided on the inner wall of each of the two ends of the groove (3), and a slider (8) is slidably connected to the inner wall of each of the sliding grooves (7). The outer walls of one end of the two sliders (8) located on the same side are respectively fixedly connected to the outer walls of the two ends of a corresponding clamping block (4).

4. The steam turbine blade tenon fixing and positioning fixture according to claim 3 is characterized in that: The inner bottom surface of the groove (3) is provided with two parallel installation grooves (9), the inner side walls of the two installation grooves (9) are rotatably connected with a same bidirectional threaded rod (10), the inner bottom surface of the groove (3) is provided with a fixing groove (11), the inner side of the fixing groove (11) is fixedly connected with a motor (12), one side outer wall of the bidirectional threaded rod (10) is rotatably penetrated through one side wall of the fixing groove (11) and is coaxially fixedly connected with the output end of the motor (12), the outer surface of the bidirectional threaded rod (10) is threadedly connected with two symmetrically distributed moving blocks (13), the top surfaces of the two moving blocks (13) are respectively fixedly connected with the bottom surfaces of the two clamping blocks (4).

5. The steam turbine blade tenon fixing and positioning fixture according to claim 4 is characterized in that: The side of the sliding pressure rod (54) away from the limiting plate (52) is arranged in an arc shape, and the rotating shaft (62) is coaxial with the base (1) and the clamping seat (2).

6. The steam turbine blade tenon fixing and positioning fixture according to claim 5, characterized in that: The outer walls at both ends of the two moving blocks (13) are respectively slidably connected to the inner walls at both ends of the two mounting grooves (9), and the bottom end of the base (1) is provided with four mounting columns for mounting on a machine tool.

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