Strength hydrostatic test tool for large-diameter thin-walled workpiece with flange

Abstract

The utility model discloses a test tool, and particularly relates to a hydraulic test tool for the strength of a flanged large-diameter thin-walled workpiece, which comprises a flanged thin-walled workpiece, a workpiece body and a cover plate, the workpiece body consists of a hollow cylinder and a flange section arranged at the middle section or the lower section of the outer surface of the hollow cylinder, a plurality of threaded holes are uniformly formed in the top surface of the hollow cylinder, and a plurality of lower flange unthreaded holes corresponding to the upper flange unthreaded holes are uniformly formed in the flange section in the circumferential direction; the cover plate is an annular cover plate, a through water inlet hole is formed in the cover plate, a plurality of cover plate unthreaded holes corresponding to the threaded holes in a one-to-one mode are evenly formed in the cover plate, and a sealed annular cavity is defined by the thin-wall part with the flange, the workpiece body and the cover plate. The device is extremely simple in structure, easy to operate, good in strength and sealing performance, convenient to assemble and disassemble, short in test period, low in water consumption, good in repeatability and suitable for strength hydrostatic tests of batch products.

Description

Technical Field

[0001] This utility model relates to a strength hydrostatic testing fixture, specifically a strength hydrostatic testing fixture for large-diameter thin-walled parts with flanges. Background Technology

[0002] The main purpose of the hydrostatic test is to check the reliability and safety of the test product under a certain pressure, ensuring that the product can meet the usage requirements under the design pressure. The test pressure is generally 1.5 times the working pressure of the test product. The hydrostatic test usually involves filling the sealed cavity of the workpiece with water, using a pressure pump to pressurize the liquid inside the cavity, and then squeezing it to achieve the pressure increase and decrease process.

[0003] Existing fixtures for hydrostatic testing of cylindrical pipe fittings primarily involve welding plugs to both ends of large-diameter, thin-walled fittings with flanges. This requires leaving space for the heat-affected zone at both ends of the pipe, which is then removed after the hydrostatic test. However, for hydrostatic testing of large-diameter, thin-walled pipe fittings, the large cross-section of the cavity makes welding a time-consuming and labor-intensive method. Furthermore, welding carries the risk of deformation, which can lead to product scrapping, especially for products with high precision requirements. Moreover, leaving space for the heat-affected zone increases material costs, and the need for machining to remove this space after the hydrostatic test further increases manufacturing costs and extends the product manufacturing cycle. Summary of the Invention

[0004] The purpose of this utility model is to solve the above-mentioned technical problems and provide a flanged large-diameter thin-walled component strength hydrostatic testing fixture that is extremely simple in structure, easy to operate, has good strength and sealing performance, is easy to load and unload, has a short test cycle, low water consumption, good repeatability, and is suitable for strength hydrostatic testing of batch products.

[0005] The technical solution includes a flanged thin-walled component. The flanged thin-walled component has multiple upper flange holes circumferentially opened at its flange end. It includes a workpiece body and a cover plate. The workpiece body consists of a hollow cylinder and a flange segment located on the middle or lower section of the outer surface of the hollow cylinder. The top surface of the hollow cylinder has multiple threaded holes evenly distributed. The flange segment has multiple lower flange holes evenly distributed circumferentially corresponding to the upper flange holes. The cover plate is an annular cover plate with a through-hole for water inlet and multiple cover plate holes evenly distributed, each corresponding to one of the threaded holes. A first bolt passes through the cover plate holes and connects to the threaded holes on the top surface of the hollow cylinder. A second bolt passes through the upper flange holes on the flange end and the lower flange holes on the flange segment and connects to a nut. The outer circumferential sidewall of the cover plate abuts against the upper inner wall of the flanged thin-walled component. The flanged thin-walled component, the workpiece body, and the cover plate together form a sealed annular cavity.

[0006] The hollow cylinder has an outer circumferential sealing groove on the outside of the threaded hole on its top surface, and an outer circumferential sealing ring is installed in the groove.

[0007] The outer peripheral sidewall of the cover plate is provided with an upper sealing groove and a lower sealing groove, and an upper sealing ring and a lower sealing ring are respectively installed in the groove.

[0008] At least one flange sealing groove is opened on the inner side of the flange hole on the bottom surface of the flange end of the flange thin-walled component, and a flange sealing ring is arranged in the groove.

[0009] The flange end of the flanged thin-walled component is also provided with a lifting hole.

[0010] The flange end of the workpiece body is provided with a lifting hole.

[0011] The cover plate also has vent holes.

[0012] To address the problems in the background art, the inventors have made the following improvements:

[0013] A workpiece body and cover plate are assembled on a flanged thin-walled component, forming a sealed annular cavity. Water is then pumped through and pressurized for a strength hydrostatic test. Compared to traditional methods, this method uses a smaller cavity cross-section, making the strength hydrostatic test easier and more accurate. All three parts are detachably connected by bolts, eliminating the welding process, making operation simpler and more reliable, and avoiding various problems associated with welding. Sealing grooves and sealing rings are provided at the joints to ensure effective sealing. This invention features an extremely simple structure, requires no welding, is easy to assemble and disassemble, offers high precision and high experimental efficiency, and is suitable for batch strength hydrostatic testing of flanged thin-walled components. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the tooling of this utility model.

[0015] Figure 2 3D view of the tooling body.

[0016] Figure 3 3D view of the cover plate.

[0017] Figure 4 3D view of a thin-walled component with a flange.

[0018] The components include: 1. Tooling body; 2. Cover plate; 3. Thin-walled component with flange; 4. First bolt; 5. First gasket; 6. Second bolt; 7. Second gasket; 8. Nut; 9. Flange sealing ring; 10. Flange sealing ring; 11. Lower sealing ring; 12. Outer circumferential sealing ring; 13. Upper sealing ring; 14. Hollow column; 15. Flange section; 16. Water inlet; 17. Vent; 18. Annular cavity.

[0019] 1-1 Threaded hole; 1-2, Lower flange plain hole; 1-3, Outer circumferential sealing groove; 1-4, Lifting hole;

[0020] 2-2, Cover plate with clear hole; 2-3, Upper sealing groove; 2-4, Lower sealing groove;

[0021] 3-1. Upper flange clear hole; 3-2. Flange sealing groove; 3-3. Flange sealing groove; 3-4. Inner hole of thin-walled flanged component; 3-5. Lifting hole. Detailed Implementation

[0022] The present invention will be further explained below with reference to the accompanying drawings:

[0023] See Figure 1 This utility model includes a flanged thin-walled component 3, a workpiece body 1, and a cover plate 2. See [reference needed]. Figure 4 The flange end of the flanged thin-walled component 3 has multiple upper flange holes 3-1 circumferentially opened, see [reference]. Figure 2 The workpiece body 1 is composed of a hollow cylinder 14 and a flange section 15 located in the middle or lower section of the outer surface of the hollow cylinder 14. The top surface of the hollow cylinder 14 is uniformly provided with a plurality of threaded holes 1-1, and the flange section 15 is uniformly provided circumferentially with a plurality of lower flange holes 1-2 corresponding to the upper flange holes 3-1; see also Figure 3 The cover plate 2 is an annular cover plate with a through water inlet 16 and an exhaust vent 17. The water inlet 16 is consistent with the interface of the booster pump pipeline and is used to install the booster pump pipeline. The exhaust vent 17 is equipped with a screw plug. Multiple smooth holes 2-2 are also evenly distributed on the cover plate, corresponding one-to-one with the threaded holes 1-1. The first bolt 4 passes through the smooth holes 2-2 on the cover plate and connects to the threaded hole 1-1 on the top surface of the hollow column 14. The second bolt 6 passes through the smooth hole 3-1 on the upper flange of the flange end and the smooth hole 1-2 on the lower flange of the flange section 15 and connects to the nut 8. The outer peripheral sidewall of the cover plate 2 abuts against the upper inner wall of the flanged thin-walled component 3. The flanged thin-walled component 3, the workpiece body 1, and the cover plate 2 together form a sealed annular cavity 18.

[0024] In this embodiment, the outer diameter of the cover plate 2 is matched with the inner diameter of the flanged thin-walled component 3, and the dimensional tolerance is controlled according to H8 / f7. The outer diameter tolerance of the cover plate 2 is f7, and the inner diameter tolerance of the flanged thin-walled component 3 is H8.

[0025] The hollow column 14 has an outer peripheral sealing groove 1-3 on the outer side of the threaded hole 1-1 on its top surface, and an outer peripheral sealing ring 12 is installed in the groove. The outer peripheral sidewall of the cover plate 2 is provided with an upper sealing groove 2-3 and a lower sealing groove 2-4, and an upper sealing ring 13 and a lower sealing ring 11 are installed in the groove, respectively. The flange end bottom surface of the flange thin-walled component 3 has two flange sealing grooves 3-2 and 3-3 on the inner side of the flange hole 3-1, and flange sealing rings 9 and 10 are installed in the groove.

[0026] The flange end of the flanged thin-walled component 3 is also provided with a lifting hole 3-5 for connecting a lifting device, and the flange end of the workpiece body 1 is provided with a lifting hole 1-4 for connecting a lifting device.

[0027] During the experiment: See Figure 1 (Partially cut open in the figure), place the tool body 1 flat with the end face with threaded hole 1-1 facing upwards. Place the flanged thin-walled part 3 with the flange facing downwards, and install the flange sealing rings 9 and 10 in the two sealing grooves 3-2 and 3-3 on the bottom flange end of the flanged thin-walled part 3. Apply lithium-based grease to the surface of the sealing rings to prevent them from falling off;

[0028] Install the flanged thin-walled component 3 onto the fixture body 1, aligning the holes 3-1 and 1-2 on the upper and lower flanges. Secure the flanged thin-walled component 3 onto the fixture body 1 using the second bolt, second washer 7, and nut 8. Install the lower sealing ring 11 and upper sealing ring 13 in the outer circumferential sealing groove 1-3 of the cover plate 2, and install the outer circumferential sealing ring 12 in the sealing groove on the upper end face of the fixture body 1. Install the cover plate 2 into the inner hole of the flanged thin-walled component 3, aligning the hole 2-2 on the cover plate 2 with the threaded hole 1-1 on the upper end face of the fixture body 1. Secure the cover plate 2 onto the fixture body 1 using the first bolt 4 and first washer 5. Install the pressurized pump pipeline interface into the water inlet hole 16 on the end face of the cover plate 2, and install a screw plug into the vent hole 17. Do not tighten the screw plug initially; after pressurization, tighten the screw plug after the annular cavity 18 is filled with water. Conduct a strength hydrostatic test according to the test requirements.

Claims

1. A hydraulic pressure testing fixture for a large-diameter thin-walled component with a flange, comprising a thin-walled component with a flange, wherein the flange end of the thin-walled component has a plurality of upper flange holes circumferentially opened, characterized in that, The device includes a workpiece body and a cover plate. The workpiece body consists of a hollow cylinder and a flange section located on the middle or lower section of the outer surface of the hollow cylinder. The top surface of the hollow cylinder is uniformly provided with multiple threaded holes, and the flange section is uniformly provided with multiple lower flange holes corresponding to the upper flange holes along the circumference. The cover plate is an annular cover plate with a through water inlet hole and multiple cover plate holes corresponding to the threaded holes. A first bolt passes through the cover plate holes and connects to the threaded hole on the top surface of the hollow cylinder. A second bolt passes through the upper flange hole on the flange end and the lower flange hole on the flange section and connects to a nut. The outer peripheral sidewall of the cover plate abuts against the upper inner wall of the flanged thin-walled component. The flanged thin-walled component, the workpiece body, and the cover plate together form a sealed annular cavity.

2. The hydraulic pressure testing fixture for large-diameter thin-walled components with flanges as described in claim 1, characterized in that, The hollow cylinder has an outer circumferential sealing groove on the outside of the threaded hole on its top surface, and an outer circumferential sealing ring is installed in the groove.

3. The hydraulic pressure testing fixture for large-diameter thin-walled components with flanges as described in claim 1, characterized in that, The outer peripheral sidewall of the cover plate is provided with an upper sealing groove and a lower sealing groove, and an upper sealing ring and a lower sealing ring are respectively installed in the groove.

4. The hydraulic pressure testing fixture for large-diameter thin-walled components with flanges as described in claim 1, characterized in that, At least one flange sealing groove is opened on the inner side of the flange hole on the bottom surface of the flange end of the flange thin-walled component, and a flange sealing ring is arranged in the groove.

5. The hydraulic pressure testing fixture for large-diameter thin-walled components with flanges as described in claim 4, characterized in that, The flange end of the flanged thin-walled component is provided with a lifting hole.

6. The hydraulic pressure testing fixture for large-diameter thin-walled components with flanges as described in claim 4, characterized in that, The flange end of the workpiece body is provided with a lifting hole.

7. The hydraulic pressure testing fixture for large-diameter thin-walled components with flanges as described in any one of claims 1-6, characterized in that, The cover plate also has vent holes.

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