A special fixture for cargo oil pump housing

Abstract

The application provides a special fixture for a fuel pump shell, comprising a tool base plate, at least one set of first fixed connecting pieces are arranged on the tool base plate, and the tool base plate is installed on a workbench conversion positioning disc through the first fixed connecting pieces, a positioning boss for cooperation with the workbench conversion positioning disc is arranged on the bottom end face of the tool base plate, so that the positioning boss of the bottom end face of the tool base plate is clamped into the positioning groove of the workbench conversion positioning disc and is fixedly connected through the first fixed connecting pieces. The whole structure is simple, the difficulty of workpiece alignment operation is reduced by adding two balance blocks, the workpiece machining precision is improved, and the workpiece gravity center position is coincided with the rotation center of the workpiece by setting the specific size of the balance block, thereby solving the vibration and oval problem caused by the unstable workpiece gravity center generated by the centrifugal force.

Description

Technical Field

[0001] This utility model belongs to the technical field of pump housing special clamps, and specifically relates to a special clamp for a cargo oil pump housing. Background Technology

[0002] Cargo oil pumps are the most commonly used type of pump on oil tankers or chemical transport vessels. The pump casing, the main core component of a cargo oil pump, is an important structure for installing the pump's power shaft and sealing components. Therefore, it requires high precision in the installation and fitting parts. However, because its pipeline structure is a spiral volute shape and has an irregular structure, it is not easy to clamp and fix.

[0003] During the rotary machining process, centrifugal force can cause the workpiece's center of gravity to become unstable during cutting, easily leading to elliptical shapes in critical areas. This can result in the mating surfaces of the pump casing, shaft seal, mechanical seal, and other components becoming out of round, creating uneven gaps, and even causing media leakage.

[0004] Therefore, how to solve the defects in the existing technology has become one of the urgent problems to be solved in the field of pump casing special fixture technology. Utility Model Content

[0005] In view of the problems existing in the background technology, the present utility model provides a special fixture for the pump housing of a cargo oil pump, including a tooling base plate. The tooling base plate is provided with at least one set of first fixing connectors, and the tooling base plate is installed on the worktable conversion positioning plate through the first fixing connectors. The bottom end face of the tooling base plate is provided with a positioning boss that cooperates with the worktable conversion positioning plate, so that the positioning boss on the bottom end face of the tooling base plate is engaged in the positioning groove of the worktable conversion positioning plate, and is fixedly connected by the first fixing connectors.

[0006] The workpiece positioning plate has a central threaded hole in the middle, and the central threaded hole is internally threaded to a balance support column. The balance support column has at least two sets of mounting holes, and the two sets of mounting holes are internally threaded to a mounting shaft. A first balance block and a second balance block are respectively provided outside the mounting shaft, and the first balance block and the second balance block are respectively fixedly installed on the mounting shaft by a connector.

[0007] Optionally, there is a gap between the positioning boss and the positioning groove, and the gap is less than 0.005 mm.

[0008] Optionally, the tooling base plate has at least two sets of workpiece positioning holes on its periphery. One end of each set of workpiece positioning holes is open, and there is an included angle A between the two sets of workpiece positioning holes, with the included angle A being 125°.

[0009] Optionally, the tooling base plate has at least one set of threaded holes, and the threaded holes are internally threaded to a second fixed connector.

[0010] Optionally, a groove is provided in the middle of the tooling base plate, and multiple sets of grooves are provided, with a depth of 2.5mm.

[0011] Optionally, the pump housing fixture further includes a workpiece positioning plate located in the middle of the tooling base plate, and the end face of the workpiece positioning plate away from the balance support column is provided with a protruding end that cooperates with the slide groove, and is fixed by a third fixing connector.

[0012] Optionally, the first balance block and the second balance block include a first end face and a second end face, and the first end face near the balance support column is triangular, and the second end face away from the balance support column is cylindrical, and the diameter of the second end face of the first balance block / the diameter of the second end face of the second balance block = 1 / 2;

[0013] The distance between the center positions of the first and second balance blocks is 35mm.

[0014] In summary, the beneficial effects of this utility model are:

[0015] This utility model has a simple overall structure. By adding two sets of balance blocks, the difficulty of workpiece alignment is reduced, thereby improving the machining accuracy of the workpiece. When the diameter of the second end face of the first balance block / the diameter of the second end face of the second balance block = 1 / 2, and the distance between the center position of the first balance block and the center position of the second balance block is 35mm, the center of gravity of the workpiece coincides with the center of rotation of the workpiece. This solves the vibration and elliptic problems caused by the instability of the center of gravity of the workpiece due to centrifugal force, and makes the concentricity and perpendicularity of the two ends of the workpiece better meet the design requirements, ensuring the accuracy and stability of the product. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of a special clamp for a cargo oil pump housing according to the present invention;

[0017] Figure 2 This utility model Figure 1 Enlarged view of the middle section structure.

[0018] Figure label:

[0019] 1. Tooling base plate;

[0020] 2. First fixed connector;

[0021] 3. Second fixed connector;

[0022] 4. Workpiece positioning plate;

[0023] 5. Third fixed connector;

[0024] 6. First balancing block;

[0025] 7. Balance support column;

[0026] 8. Second balancing block;

[0027] 9. Connectors;

[0028] 10. Slide groove;

[0029] 11. Workpiece positioning holes. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. Although exemplary embodiments are disclosed in the drawings, it should be understood that the present utility model can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to facilitate a more thorough understanding of the present utility model and to fully convey the concept of the present utility model to those skilled in the art.

[0031] In the description of this specification, the references to terms such as "certain embodiments," "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the 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 a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0032] In this utility model, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "join," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "join" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] like Figure 1-2As shown, this embodiment provides a special fixture for a cargo oil pump casing. The fixture is made of high-quality carbon steel and heat-treated to ensure sufficient rigidity, excellent performance, and resistance to stress deformation during long-term use. The fixture includes a base plate 1, on which at least one set of first fixing connectors 2 are provided. The base plate 1 is mounted on the worktable conversion positioning plate through the first fixing connectors 2, thereby achieving the connection between the base plate 1 and the worktable conversion positioning plate.

[0034] The tooling base plate 1 has a positioning boss on its bottom end face (the end face away from the balance support column) that works with the worktable conversion positioning plate, so that the positioning boss on the bottom end face of the tooling base plate can be inserted into the positioning groove of the worktable conversion positioning plate and fixedly connected by the first fixed connector 2.

[0035] In practical applications, the positioning bosses are arranged in at least two sets and are asymmetrically arranged. The positioning bosses are generally conical in shape, and their cone axis is inclined at a 3°-5° angle to the base plate reference surface. During the assembly process, the preload is generated by the deformation of the cone surface.

[0036] Furthermore, there is a gap between the positioning boss and the positioning groove, and the gap is less than 0.005mm. In this embodiment, in order to facilitate the assembly of the positioning boss of the tooling base plate and the positioning groove of the worktable conversion positioning plate, a gap of less than 0.005mm needs to be added between the positioning boss and the positioning groove during the design.

[0037] Furthermore, the first fixed connector 2 is preferably a fixing bolt, but other fixing methods with the same effect are also acceptable.

[0038] Furthermore, at least two sets of workpiece positioning holes 11 are provided on the periphery of the tooling base plate 1. One end of each set of workpiece positioning holes is open, and there is an included angle A between the two sets of workpiece positioning holes 11, with the included angle A being 125°.

[0039] Furthermore, the tooling base plate 1 is provided with at least one set of threaded holes, and the threaded holes are internally threaded to a second fixing connector 3, which is preferably a fastening bolt.

[0040] Furthermore, a groove 10 is provided in the middle part of the tooling base plate 1, and multiple sets of grooves 10 are arranged, with a depth of 2.5mm.

[0041] Furthermore, the pump housing special fixture also includes a workpiece positioning plate 4 located in the middle of the tooling base plate 1, and the end face of the workpiece positioning plate 4 away from the balance support column 7 is provided with a protruding end that cooperates with the slide groove 10, and is fixed by a third fixing connector 5, preferably a fixing bolt.

[0042] In this embodiment, by pushing the workpiece positioning disk 4, the protruding end of the workpiece positioning disk 4 slides in the slide groove 10, thereby adjusting the position of the workpiece positioning disk on the tooling base plate. Once it is moved to a suitable position, the connection between the workpiece positioning disk and the tooling base plate can be realized through the third fixed connector 5.

[0043] Furthermore, a central threaded hole is provided in the middle part of the workpiece positioning disk 4, and a balance support column 7 is connected to the internal thread of the central threaded hole.

[0044] Furthermore, the balance support column 7 has at least two sets of mounting holes, and the two sets of mounting holes are internally threaded to the mounting shaft. A first balance block 6 and a second balance block 8 are respectively provided outside the mounting shaft. The first balance block 6 and the second balance block 8 are fixedly installed on the mounting shaft by the connector 9, thereby realizing the connection between the balance block and the mounting shaft.

[0045] Furthermore, the first balance block and the second balance block include a first end face and a second end face, and the first end face near the balance support column 7 is triangularly arranged, and the second end face away from the balance support column 7 is cylindrically arranged, and the diameter of the second end face of the first balance block / the diameter of the second end face of the second balance block = 1 / 2;

[0046] The distance between the center positions of the first and second balance blocks is 35mm.

[0047] In practical applications, the positioning boss on the bottom end face of the tooling base plate 1 is first inserted into the positioning groove of the worktable conversion positioning plate, and the tooling base plate 1 is fixedly connected by the first fixed connector 2 to install the tooling base plate 1 onto the worktable of the equipment.

[0048] Then, after removing the two sets of balance blocks (the first balance block and the second balance block), the workpiece is installed on the tooling base plate, so that the positioning end of the workpiece extends into the workpiece positioning hole 11 opened on the tooling base plate 1 and is used to engage and connect, so that the installation position of the balance block is aligned with the corresponding position of the tooling. Then, the two balance blocks are installed on the balance support column 7. Finally, the second fixed connector is passed through the threaded holes on the workpiece and the tooling base plate from top to bottom and threaded, thereby installing the workpiece on the tooling base plate.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not restrictive. Although this utility model has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solution of this utility model do not depart from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A special fixture for a cargo oil pump housing, characterized in that The tooling includes a tooling base plate and a workpiece positioning plate placed in the middle of the tooling base plate. The tooling base plate is provided with at least one set of first fixing connectors, and the tooling base plate is installed on the worktable conversion positioning plate through the first fixing connectors. The bottom end face of the tooling base plate is provided with a positioning boss that cooperates with the worktable conversion positioning plate, so that the positioning boss on the bottom end face of the tooling base plate is engaged in the positioning groove of the worktable conversion positioning plate, and is fixedly connected through the first fixing connectors. The workpiece positioning plate has a central threaded hole in the middle, and the central threaded hole is internally threaded to a balance support column. The balance support column has at least two sets of mounting holes, and the two sets of mounting holes are internally threaded to a mounting shaft. A first balance block and a second balance block are respectively provided outside the mounting shaft, and the first balance block and the second balance block are respectively fixedly installed on the mounting shaft by a connector.

2. The special clamp for a cargo oil pump casing according to claim 1, characterized in that, There is a gap between the positioning boss and the positioning groove, and the gap is less than 0.005mm.

3. The special clamp for a cargo oil pump casing according to claim 1, characterized in that, The tooling base plate has at least two sets of workpiece positioning holes on its periphery. One end of each set of workpiece positioning holes is open, and there is an included angle A between the two sets of workpiece positioning holes, with the included angle A being 125°.

4. A special clamp for a cargo oil pump casing according to claim 3, characterized in that, The tooling base plate has at least one set of threaded holes, and the threaded holes are internally threaded to a second fixed connector.

5. A special clamp for a cargo oil pump casing according to claim 4, characterized in that, The tooling base plate has a sliding groove in the middle, and multiple sets of sliding grooves are arranged. The depth of the sliding groove is 2.5mm.

6. A special clamp for a cargo oil pump casing according to claim 5, characterized in that, The workpiece positioning disk end face away from the balance support column is provided with a protruding end that cooperates with the slide groove and is fixed by a third fixed connector.

7. A special clamp for a cargo oil pump casing according to claim 1, characterized in that, The first balance block and the second balance block each have a first end face and a second end face. The first end face, which is closer to the balance support column, is triangular, and the second end face, which is farther from the balance support column, is cylindrical. The diameter of the second end face of the first balance block / the diameter of the second end face of the second balance block = 1 / 2. The distance between the center of the first balance block and the center of the second balance block is 35mm.

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