Valve casing heat preservation nut welding tool applied to steam turbine product
By designing tooling components such as support plates, rocker arms, and centering balls, the problem of low welding efficiency of thermal insulation nuts in existing technologies has been solved, achieving automatic centering and angle adjustment, and improving spot welding accuracy and efficiency.
Patent Information
- Application Number
- CN202520400819.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-07
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2035-03-07
AI Technical Summary
The welding process of thermal insulation nuts in existing steam turbine products requires marking and the use of tooling such as pressure plates, resulting in low welding efficiency and high time costs.
A tooling system comprising a support plate, rocker arm, centering ball, shaft, bearing housing with bearings, and multiple limit pins was designed. The system achieves automatic centering and angle adjustment of the thermal insulation nut through the centering ball and indexing marks, eliminating the need for scribing and improving spot welding accuracy and efficiency.
It enables automatic centering and angle adjustment of the insulation nut and gasket, improving spot welding accuracy and efficiency, and saving time and costs.
Smart Images
Figure CN223789840U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a welding fixture for assembling thermal insulation nuts, specifically a welding fixture for assembling thermal insulation nuts for valve housings of steam turbine products. This utility model is applied in the field of nut welding. Background Technology
[0002] In steam turbine products, the outer surface of valve bodies such as the intermediate pressure main steam valve and reheat valve requires the installation of thermal insulation nuts. To ensure the quality of the installation, the thermal insulation nuts must first be welded onto the gaskets, ensuring they are centered on the gaskets. Then, they are spot-welded at three evenly distributed points around the circumference. Finally, they are welded onto the valve body. Typically, each valve body has more than 200 thermal insulation nuts. According to the existing method of installing thermal insulation nuts, it is necessary to mark lines on each gasket, then place the nuts on the gaskets according to the lines, and spot-weld at three evenly distributed points around the circumference. During spot welding, to prevent the nuts from moving, it is necessary to use tooling such as pressure plates to hold them in place. The installation efficiency is low and the time cost is high. Utility Model Content
[0003] The purpose of this utility model is to solve the problem that existing welding of thermal insulation nuts requires marking each washer and using tooling such as pressure plates to hold them in place, resulting in low welding efficiency and high time cost. The present invention provides a welding tooling for thermal insulation nuts on valve shells of steam turbine products.
[0004] The technical solution adopted by this utility model to solve the above problems is:
[0005] A welding fixture for assembling insulation nuts on valve housings of steam turbine products includes a support plate, a rocker arm, a centering ball, a shaft, a bearing housing with bearings, and multiple limit pins.
[0006] The support plate includes a vertical support rod and a horizontal plate. The vertical support rod is installed vertically on the upper surface of the horizontal plate. The rocker arm is an 'L'-shaped bent rod. One end of the horizontal rod of the rocker arm is rotatably connected to the top of the vertical support rod. A centering ball is fixedly installed on the bottom end of the vertical rod of the rocker arm. Multiple limiting posts are evenly distributed radially and vertically fixedly installed on the upper surface of the horizontal plate. Shims are set inside the multiple limiting posts. Insulation nuts are set above the shims. The centering ball presses on the insulation nuts. The bottom end of the horizontal plate is fixedly connected to the top end of the shaft. The shaft is rotatably connected and installed on a bearing seat with bearings.
[0007] Furthermore, it also includes a mounting base, with a bearing housing fixedly mounted on the upper end face of the mounting base.
[0008] Furthermore, it also includes a pivot pin, with one end of the horizontal rocker arm rotatably connected to the top of the vertical support rod via the pivot pin.
[0009] Furthermore, it also includes a handle, which is fixedly mounted on the rocker arm horizontal bar.
[0010] Furthermore, the support plate also includes a pointer, which is vertically fixed on the lower end face of the horizontal plate. Three graduation marks are machined radially on the fixed base, and the angle between two adjacent graduation marks is 120°. The bottom of the pointer on the support plate points to the graduation marks on the fixed base.
[0011] Furthermore, there are at least three limiting posts, which are arranged radially and evenly. The center of the circle formed by the axes of the multiple limiting posts is on the same straight line as the center of the centering ball, the center line of the insulation nut, and the center line of the washer.
[0012] Furthermore, the shaft is interference-fitted onto a bearing housing with a bearing.
[0013] Furthermore, the bearing housing with the bearing is fixedly mounted on the fixed base by bolts.
[0014] Furthermore, the bottom end of the horizontal plate is welded and fixed to the top end of the shaft, the handle is welded and fixedly installed on the horizontal bar of the rocker arm, and the centering ball is welded and fixedly installed on the bottom end of the vertical bar of the rocker arm.
[0015] The beneficial effects of this utility model are:
[0016] In this application, during the welding of thermal insulation nuts, the nut and washer can be automatically centered using this tooling, eliminating the need for scribing. At the same time, the tooling can be rotated to meet the welding angle requirements of the thermal insulation nut 9 and washer 10. The pointer on the support plate 1 corresponds to the graduation mark line on the fixed seat 2, eliminating the need for scribing and improving the accuracy of electric welding. It also saves time and costs, and improves the efficiency of spot welding of the thermal insulation nut 9 and washer 10. Attached Figure Description
[0017] Figure 1 This is the main view of the overall structure of this application.
[0018] Figure 2 for Figure 1 View B.
[0019] Figure 3 for Figure 1 A-direction view.
[0020] Figure 4 for Figure 1 The C-direction view. Detailed Implementation
[0021] Specific implementation method one: Combining Figures 1-4 This embodiment describes a welding fixture for installing thermal insulation nuts on valve housings of steam turbine products. The fixture comprises a support plate 1, a rocker arm 4, a centering ball 5, a shaft 6, a bearing seat 8 with bearings, and multiple limiting posts 7.
[0022] The support plate 1 includes a vertical support rod and a horizontal plate. The vertical support rod is vertically installed on the upper surface of the horizontal plate. The rocker arm 4 is an L-shaped bent rod. One end of the horizontal rod of the rocker arm 4 is rotatably connected to the top of the vertical support rod. The centering ball 5 is fixedly installed on the bottom end of the vertical rod of the rocker arm 4. Multiple limiting posts 7 are evenly distributed radially and vertically fixedly installed on the upper surface of the horizontal plate. The gasket 10 is set inside the multiple limiting posts 7. The heat insulation nut 9 is set above the gasket 10. The centering ball 5 presses on the heat insulation nut 9. The bottom end of the horizontal plate is fixedly connected to the top end of the shaft 6. The shaft 6 is rotatably connected to the bearing seat 8 with bearing.
[0023] Specific Implementation Method Two: Combining Figure 1 and Figure 4 This embodiment describes a welding fixture for installing thermal insulation nuts on valve housings of steam turbine products. It also includes a fixed base 2, with a bearing housing 8 fixedly mounted on the upper surface of the fixed base 2. Other methods are the same as in specific embodiment one.
[0024] Specific implementation method three: Combining Figures 1-2 This embodiment describes a welding fixture for installing insulation nuts on valve housings of steam turbine products. It further includes a rotating pin 11, and one end of the horizontal rod of the rocker arm 4 is rotatably connected to the top of the vertical support rod via the rotating pin 11. Other methods are the same as in specific embodiment two.
[0025] Specific implementation method four: Combination Figure 1 This embodiment describes a welding fixture for installing thermal insulation nuts on valve housings of steam turbine products. It also includes a handle 3, which is fixedly mounted on a horizontal bar of the rocker arm 4. Other methods are the same as in specific embodiment one.
[0026] Specific Implementation Method Five: Combining Figure 1 and Figure 4 This embodiment describes a welding fixture for installing insulation nuts on valve housings of steam turbine products. The support plate 1 also includes a pointer, which is vertically fixed on the lower end face of the horizontal plate. The fixing seat 2 has three radially machined graduation marks, and the angle between two adjacent graduation marks is 120°. The bottom of the pointer on the support plate 1 points to the graduation marks on the fixing seat 2.
[0027] The three graduation marks on the fixed base 2 are the 0° graduation mark, the 120° graduation mark, and the 240° graduation mark. Other methods are the same as in specific embodiment two.
[0028] Specific Implementation Method Six: Combination Figure 1This embodiment describes a welding fixture for installing thermal insulation nuts on steam turbine product valve housings. It comprises at least three limiting posts 7, which are radially evenly distributed. The center of the circle formed by the axes of the multiple limiting posts 7 is collinear with the center of the centering ball 5, the centerline of the thermal insulation nut 9, and the centerline of the washer 10. Other methods are the same as in specific embodiment one.
[0029] Specific implementation method seven: Combination Figure 1 This embodiment describes a welding fixture for installing thermal insulation nuts on valve housings of steam turbine products. Shaft 6 is interference-fitted onto a bearing housing 8 with a bearing. Other methods are the same as in specific embodiment one.
[0030] Specific implementation method eight: Combination Figure 1 and Figure 4 This embodiment describes a welding fixture for installing thermal insulation nuts on valve housings of steam turbine products. A bearing housing 8 with a bearing is fixedly mounted on a fixed base 2 using bolts. Other methods are the same as in specific embodiment two.
[0031] Specific Implementation Method Nine: Combining Figure 1 This embodiment describes a welding fixture for installing thermal insulation nuts on valve housings of steam turbine products. The bottom end of a horizontal plate is welded and fixed to the top end of a shaft 6. A handle 3 is welded and fixed to the horizontal rod of a rocker arm 4, and a centering ball 5 is welded and fixed to the bottom end of the vertical rod of the rocker arm 4. Other methods are the same as in specific embodiments one or four.
[0032] During operation, lift handle 3 to place gasket 10 on support plate 1, where it is limited by limit post 7; position insulation nut 9 using centering ball 5, then release handle 3 to press centering ball 5 firmly onto insulation nut 9 and gasket 10; rotate support plate 1 until the pointer on support plate 1 aligns with the 0° graduation mark on fixed seat 2; spot weld the first point of insulation nut 9 and gasket 10 using a welding machine; then, spot weld insulation onto support plate 1 until the pointer aligns with the 120° graduation mark on fixed seat 2. For the second point between nut 9 and washer 10, rotate support plate 1 so that the pointer corresponds to the 240° graduation mark on fixed seat 2, and spot weld the third point between insulation nut 9 and washer 10. At this point, the spot welding of insulation nut 9 and washer 10 is completed. Then remove washer 10 and insulation nut 9, replace the next washer 10 and insulation nut 9, and repeat the above steps until all washer and insulation nut are spot welded. Following this operation method can effectively ensure spot welding accuracy and quality, and is highly efficient.
[0033] The above-described specific implementations can be partially adjusted by those skilled in the art in different ways without departing from the principles and purpose of this utility model. The scope of protection of this utility model is determined by the claims and is not limited to the above-described specific implementations. All implementation schemes within its scope are bound by this utility model.
Claims
1. A welding fixture for assembling insulation nuts on valve housings of steam turbine products, characterized in that: It includes a support plate (1), a rocker arm (4), a centering ball (5), a shaft (6), a bearing housing with bearings (8), and multiple limiting posts (7); The support plate (1) includes a vertical support rod and a horizontal plate. The vertical support rod is installed vertically on the upper surface of the horizontal plate. The rocker arm (4) is an L-shaped bent rod. One end of the horizontal rod of the rocker arm (4) is rotatably connected to the top of the vertical support rod. The centering ball (5) is fixedly installed on the bottom end of the vertical rod of the rocker arm (4). Multiple limiting posts (7) are evenly distributed radially and vertically fixedly installed on the upper surface of the horizontal plate. The gasket (10) is set inside the multiple limiting posts (7). The heat insulation nut (9) is set above the gasket (10). The centering ball (5) presses on the heat insulation nut (9). The bottom end of the horizontal plate is fixedly connected to the top end of the shaft (6). The shaft (6) is rotatably connected to the bearing seat (8) with bearing.
2. The welding fixture for installing thermal insulation nuts on valve housings of steam turbine products according to claim 1, characterized in that: It also includes a fixed seat (2), and a bearing seat (8) with bearings is fixedly installed on the upper end face of the fixed seat (2).
3. The welding fixture for installing thermal insulation nuts on valve housings of steam turbine products according to claim 1, characterized in that: It also includes a rotating pin (11), one end of the horizontal bar of the rocker arm (4) is rotatably connected to the top of the vertical support bar via the rotating pin (11).
4. The welding fixture for installing thermal insulation nuts on valve housings of steam turbine products according to claim 1, characterized in that: It also includes a handle (3), which is fixedly mounted on the horizontal bar of the rocker arm (4).
5. The welding fixture for installing thermal insulation nuts on valve housings of steam turbine products according to claim 2, characterized in that: The support plate (1) also includes a pointer, which is vertically fixed on the lower end of the horizontal plate. Three graduation marks are machined radially on the fixed seat (2), and the angle between two adjacent graduation marks is 120°. The bottom of the pointer on the support plate (1) points to the graduation mark on the fixed seat (2).
6. The welding fixture for installing thermal insulation nuts on valve housings of steam turbine products according to claim 1, characterized in that: The number of limiting posts (7) is at least three. The multiple limiting posts (7) are arranged radially and evenly. The center of the circle formed by the axes of the multiple limiting posts (7) is on the same straight line as the center of the centering ball (5), the center line of the heat insulation nut (9) and the center line of the washer (10).
7. The welding fixture for installing thermal insulation nuts on valve housings of steam turbine products according to claim 1, characterized in that: The shaft (6) is interference-fitted onto the bearing housing (8) with bearings.
8. The welding fixture for installing thermal insulation nuts on valve housings of steam turbine products according to claim 2, characterized in that: The bearing housing (8) with bearings is fixedly mounted on the fixed seat (2) by bolts.
9. A welding fixture for installing thermal insulation nuts on valve housings of steam turbine products according to claim 1 or 4, characterized in that: The bottom of the horizontal plate is welded and fixed to the top of the shaft (6), the handle (3) is welded and fixed on the horizontal bar of the rocker arm (4), and the centering ball (5) is welded and fixed on the bottom of the vertical bar of the rocker arm (4).