A lathe fixture for 6-inch 150-pound class check valve body machining

Abstract

The utility model provides a lathe clamp for 6 inch 150 pound level check valve body processing belongs to mechanical processing technical field, this lathe clamp for 6 inch 150 pound level check valve body processing includes clamp body, base, first adjusting assembly, second adjusting assembly and compression assembly, base places on lathe and is detachably connected with lathe through flange, and the both ends of base are provided with first adjusting assembly and second adjusting assembly respectively, and first adjusting assembly and second adjusting assembly are provided with clamp body above, and first adjusting assembly is used to provide initial position correction, and second adjusting assembly is used for realizing angle fine adjustment, and the top of clamp body is provided with compression assembly, and compression assembly is used for the axial fixedness of clamp body, the utility model can solve the problem that traditional clamp generally exists positioning accuracy, clamping efficiency is low, and the universality is poor etc.

Description

Technical Field

[0001] This utility model belongs to the field of machining technology, specifically, it relates to a lathe fixture for machining a 6-inch 150-pound check valve body. Background Technology

[0002] The 6-inch 150-pound check valve body belongs to the category of large-diameter, medium-pressure valves. Its structural characteristics include short length, large internal cavity, flanges at both ends, and a central protrusion. When machining the sealing surfaces at both ends and the internal cavity on a lathe, traditional fixtures typically use a three-jaw chuck or flange to directly clamp this type of valve body. Although this method is simple, it has revealed several problems in practical applications.

[0003] First, the repeatability of positioning is low. Due to the lack of flexible adjustment mechanisms in the clamping methods of three-jaw chucks or flanges, the valve body is prone to positional deviations during multiple clamping operations, resulting in significant coaxiality errors and failing to meet the technical requirements of high-precision valve bodies. Second, the limitations of traditional fixtures are particularly evident for flangeless check valve bodies. Because they cannot achieve effective positioning through simple clamping, traditional machining methods struggle to guarantee axis alignment, and machining accuracy often fails to meet product standards. Furthermore, traditional fixtures have poor versatility and are difficult to adapt to valve bodies of different specifications or shapes, requiring customized fixtures for each type of valve body. This not only increases design and manufacturing costs but also leads to long changeover times, low production efficiency, and severely restricts the pace of mass production. Under the demands of high-precision and high-efficiency production, traditional fixtures can no longer meet the requirements of modern valve manufacturing, necessitating the development of a specialized fixture capable of rapid clamping, precise angle adjustment, and modular expansion. Utility Model Content

[0004] In view of this, the present invention provides a lathe fixture for machining 6-inch 150-pound check valve bodies, which can solve the problems of insufficient positioning accuracy, low clamping efficiency and poor versatility that are common in traditional fixtures.

[0005] This utility model is implemented as follows: This utility model provides a lathe fixture for machining a 6-inch 150-pound check valve body, comprising a fixture body, a base, a first adjustment component, a second adjustment component, and a clamping component. The base is placed on the machine tool and detachably connected to the machine tool via a flange. The first adjustment component and the second adjustment component are respectively provided at both ends of the upper surface of the base. The fixture body is provided above the first adjustment component and the second adjustment component. The first adjustment component is used to provide initial position correction, and the second adjustment component is used to achieve fine angle adjustment. The clamping component is provided on the top of the fixture body for axial fixation of the fixture body.

[0006] The technical advantages of the lathe fixture for machining a 6-inch 150-pound check valve body provided by this utility model are as follows: The detachable flange connection between the base and the machine tool ensures convenient installation and compatibility with various machine tool types, avoiding the complexity of traditional fixture fixing methods. The first adjustment component provides initial position correction, enabling rapid calibration of the valve body's reference position and reducing manual adjustment errors; the second adjustment component allows for fine-tuning of the angle, precisely controlling the valve body's axis deviation, ensuring machining coaxiality ≤0.03mm, and improving product accuracy by more than 50%; the axial fixing mechanism of the clamping component enhances stability and prevents displacement caused by vibration during machining.

[0007] Based on the above technical solution, the lathe fixture for machining a 6-inch 150-pound check valve body of this utility model can be further improved as follows: The base has an octagonal structure with six through holes of 21.5 mm in diameter and eight threaded holes of 10 mm in diameter evenly distributed on it. The through holes and threaded holes are used to support the switching of positioning pins for different valve body specifications.

[0008] The advantages of adopting the above-mentioned improved design are as follows: the octagonal structure provides a more uniform stress distribution and stability, and is easier to fix and expand in multiple directions compared to traditional round or square bases. The even distribution of six 21.5mm through holes and eight 10mm threaded holes supports quick switching of positioning pins for different valve body specifications, realizing modular expansion and avoiding the trouble of customizing a special base for each specification.

[0009] Furthermore, the first adjustment component includes a pad and a limiting plate. The pad is fixed to the top of the base by bolts, the limiting plate is stacked on top of the pad, and the clamp body is stacked on top of the limiting plate. The midpoint of the bottom surface of the clamp body, the midpoint of the limiting plate, and the midpoint of the pad are on the same straight line.

[0010] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the leveling plate, fixed to the base with bolts, provides a stable initial support layer; the limiting discs are stacked on top to ensure accurate initial positioning of the valve body; the coaxial design at the midpoint ensures the accuracy of position correction and avoids the accumulation of deviations. The advantage of this component lies in providing reliable initial position correction, reducing the shortcomings of low repeatability in traditional fixtures, and improving coaxiality accuracy. The layered approach facilitates disassembly and assembly, optimizes clamping efficiency, and supports modular adjustment to adapt to different valve body heights or shapes, reducing maintenance costs. Simultaneously, it enhances the rigidity and stability of the overall structure, making it suitable for high-precision machining scenarios. Furthermore, the second adjustment component includes a limit angle adjustment block, an adjustment bolt, and a fastening adjustment block. The limit angle adjustment block and the fastening adjustment block are placed side by side on the base, and the adjustment bolt passes through both the limit angle adjustment block and the fastening adjustment block.

[0011] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the limit angle adjusting block and the fastening adjusting block are designed side by side and connected through an adjusting bolt, achieving precise angle control. The advantage of this structure lies in providing efficient angle fine-tuning functionality, overcoming the shortcomings of traditional single-structure fixtures, ensuring precise alignment of the valve body axis, and improving machining accuracy. It also enhances locking reliability, reduces vibration risks, supports adaptability to different valve body specifications, reduces costs, and improves the overall durability and safety of the fixture, making it particularly suitable for angle-sensitive machining of flangeless check valve bodies.

[0012] Furthermore, the clamping assembly includes a clamping cover plate, a clamping bolt, and a fastening double-ended screw. The clamping cover plate covers the top of the clamp body. One end of the fastening double-ended screw passes through the bottom of the clamp body, the limiting plate, and the pad plate from top to bottom, and is threaded to the midpoint of the pad plate. The other end of the fastening double-ended screw is threaded to the clamping bolt. The clamping bolt passes through the clamping cover plate, and a clamping nut is fitted on the clamping bolt. The bottom surface of the clamping nut contacts the top surface of the clamping cover plate.

[0013] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the double-ended screw penetrates the multi-layer structure and cooperates with the clamping bolts and nuts to achieve axial fixation; the clamping cover plate covers the top, ensuring uniform clamping. It provides strong axial fixing force, preventing valve body displacement during machining, improving stability, and controlling coaxiality error to within ≤0.03mm. Distributed clamping reduces local stress concentration, extends fixture life, and reduces maintenance costs.

[0014] Furthermore, the adjustment angle range of the limit angle adjustment block is 0-4°40 minutes.

[0015] Furthermore, the inclined surface of the limit angle adjusting block is perpendicular to the adjusting bolt to ensure that the direction of the locking force is controllable.

[0016] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the perpendicular design of the inclined surface of the limit angle adjusting block and the adjusting bolt ensures that the direction of the locking force is controllable, avoiding deviation caused by force bias. It provides precise mechanical control, improves locking reliability and stability, enhances the durability of the overall structure, reduces vibration risk, and is suitable for high-load processing.

[0017] Compared with existing technologies, the advantages of the lathe fixture for machining a 6-inch 150-pound check valve body provided by this utility model are: 1. Through a multi-level adjustment mechanism, the coaxiality error is controlled within ≤0.03mm, which is more than 50% higher than that of traditional fixtures. This ensures higher geometric accuracy and surface quality of valve body machining, avoids product scrapping or secondary processing due to machining deviations, and thus improves the reliability and service life of the final product.

[0018] 2. Enables rapid valve body clamping with a simple and efficient workflow. Only a few steps are required from placing the valve body to axial fixing. The modular design reduces changeover time by 70%, minimizes downtime, and is suitable for mass production scenarios, thereby improving the overall production line capacity and response speed.

[0019] 3. The adoption of a universal base plate and modular hole system layout reduces the investment requirement for special fixtures, supports rapid switching between different valve body specifications, avoids the extra expenses of frequent tooling changes, and reduces maintenance costs and inventory pressure, thereby promoting enterprise resource optimization.

[0020] 4. It can be used for machining valve bodies of various specifications, especially flangeless check valve bodies. The adjustable components enable flexible expansion, reducing customization requirements and improving the reusability of fixtures and long-term economic value.

[0021] 5. The distributed clamping design and controllable locking force direction ensure stable fixation of the valve body during processing, reduce vibration and displacement risks, lower safety hazards for operators, and extend the service life of machine tools and fixtures. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A cross-sectional view of a lathe fixture used for machining a 6-inch 150-pound check valve body; Figure 2 A schematic diagram of the structure of a furniture body for machining a lathe fixture used for machining a 6-inch 150-pound check valve body; Figure 3 A top view of the base of a lathe fixture used for machining a 6-inch 150-pound check valve body; Figure 4 This is a schematic diagram of the flange connecting a lathe fixture used for machining a 6-inch 150-pound check valve body to a machine tool. The attached diagram lists the components represented by each number as follows: 10. Fixture body; 20. Base; 30. First adjustment component; 31. Pad plate; 32. Limiting plate; 40. Second adjustment component; 41. Limiting angle adjustment block; 42. Adjusting bolt; 43. Fastening adjustment block; 50. Clamping component; 51. Clamping cover plate; 52. Clamping bolt; 53. Fastening double-ended screw. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0025] like Figure 1-4 The image shows an embodiment of a lathe fixture for machining a 6-inch 150-pound check valve body provided by this utility model. In this embodiment, it includes a fixture body 10, a base 20, a first adjusting component 30, a second adjusting component 40, and a clamping component 50. The base 20 is placed on the machine tool and detachably connected to the machine tool via a flange. The first adjusting component 30 and the second adjusting component 40 are respectively provided at both ends of the upper surface of the base 20. The fixture body 10 is provided above the first adjusting component 30 and the second adjusting component 40. The first adjusting component 30 is used to provide initial position correction, and the second adjusting component 40 is used to achieve angle fine adjustment. The clamping component 50 is provided on the top of the fixture body 10 and is used to axially fix the fixture body 10.

[0026] In the above technical solution, the base 20 has an octagonal structure with 6 through holes of 21.5 mm in diameter and 8 threaded holes of 10 mm in diameter evenly distributed on it. The through holes and threaded holes are used to support the switching of positioning pins for different valve body specifications.

[0027] Furthermore, in the above technical solution, the first adjustment component 30 includes a pad plate 31 and a limiting plate 32. The pad plate 31 is fixed above the base 20 by bolts. The limiting plate 32 is stacked on top of the pad plate 31. The clamp body 10 is stacked on top of the limiting plate 32. The midpoint of the bottom surface of the clamp body 10, the midpoint of the limiting plate 32, and the midpoint of the pad plate 31 are on the same straight line.

[0028] Furthermore, in the above technical solution, the second adjustment component 40 includes a limiting angle adjustment block 41, an adjustment bolt 42, and a fastening adjustment block 43. The limiting angle adjustment block 41 and the fastening adjustment block 43 are placed side by side on the base 20, and the adjustment bolt 42 passes through both the limiting angle adjustment block 41 and the fastening adjustment block 43.

[0029] Furthermore, in the above technical solution, the clamping assembly 50 includes a clamping cover plate 51, a clamping bolt 52, and a fastening double-ended screw 53. The clamping cover plate 51 covers the top of the clamp body 10. One end of the fastening double-ended screw 53 passes through the bottom of the clamp body 10, the limiting plate 32, and the pad plate 31 from top to bottom, and is threadedly connected to the midpoint of the pad plate 31. The other end of the fastening double-ended screw 53 is threadedly connected to the clamping bolt 52. The clamping bolt 52 passes through the clamping cover plate 51, and a clamping nut is sleeved on the clamping bolt 52. The lower bottom surface of the clamping nut contacts the upper top surface of the clamping cover plate 51.

[0030] Furthermore, in the above technical solution, the adjustment angle range of the limiting angle adjustment block 41 is 0-4°40 minutes.

[0031] Furthermore, in the above technical solution, the inclined surface of the limiting angle adjusting block 41 is perpendicular to the adjusting bolt 42 to ensure that the direction of the locking force is controllable.

[0032] In use, place the 6-inch 150-pound check valve body on the limit plate in the first adjustment assembly of the fixture. The limit plate is stacked on top of the leveling plate, which is bolted to an octagonal base. The base is detachably connected to the machine tool via a flange. The midpoints of the limit plate, leveling plate, and the bottom surface of the fixture body are aligned to ensure initial positioning and centering of the valve body. Fine-tune the valve body's axis using the limit angle adjustment block and adjusting bolt in the second adjustment assembly. The limit angle adjustment block and fastening adjustment block are placed side-by-side on the base, with the adjusting bolt passing through both. By rotating the adjusting bolt, the inclined surface of the limit angle adjustment block can be precisely adjusted within the range of 0-4°40 minutes to correct axis deviation. After completing the axis fine-tuning, further tighten the limit angle adjustment block and fastening adjustment block using the adjusting bolt to achieve radial fixation of the valve body. The stable connection between the fastening adjustment block and the base ensures the valve body is firmly locked in the horizontal direction, preventing radial displacement during machining. After radial locking, use the clamping assembly to axially fix the valve body. A clamping cover plate covers the top of the fixture body. One end of the double-ended screw passes through the fixture body, the limiting plate, and the shim plate from top to bottom, and is threaded to the midpoint of the shim plate. The other end is threaded to the clamping bolt, which passes through the clamping cover plate. After the clamping nut is put on, it is tightened so that the bottom surface of the clamping nut contacts the top surface of the clamping cover plate, thereby firmly fixing the valve body in the axial direction. After the valve body is fixed radially and axially, the base is connected to the machine tool through a flange. The machine tool is started, driving the fixture to rotate as a whole, and the valve body is turned.

[0033] Specifically, the principle of this utility model is as follows: This application, through an innovative three-level positioning structure, including initial position correction, angle fine-tuning, and axial fixing, effectively solves the problems of insufficient positioning accuracy, low clamping efficiency, and poor versatility of traditional fixtures. Compared with the traditional three-jaw chuck or flange direct clamping method, this fixture is suitable for the precision machining of flangeless check valve bodies, and can achieve precise adjustment of the valve body axis, ensuring that product technical requirements are met.

[0034] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A lathe fixture for machining a 6-inch 150-pound check valve body, characterized in that, The fixture includes a fixture body (10), a base (20), a first adjustment component (30), a second adjustment component (40), and a clamping component (50). The base (20) is placed on the machine tool and detachably connected to the machine tool via a flange. The first adjustment component (30) and the second adjustment component (40) are respectively provided at both ends of the upper surface of the base (20). The fixture body (10) is provided above the first adjustment component (30) and the second adjustment component (40). The first adjustment component (30) is used to provide initial position correction, and the second adjustment component (40) is used to achieve angle fine adjustment. The clamping component (50) is provided on the top of the fixture body (10) and is used to axially fix the fixture body (10).

2. A lathe fixture for machining a 6-inch 150-pound check valve body according to claim 1, characterized in that, The base (20) has an octagonal structure with 6 through holes of 21.5 mm in diameter and 8 threaded holes of 10 mm in diameter evenly distributed on it. The through holes and threaded holes are used to support the switching of positioning pins for different valve body specifications.

3. A lathe fixture for machining a 6-inch 150-pound check valve body according to claim 2, characterized in that, The first adjustment component (30) includes a pad plate (31) and a limiting plate (32). The pad plate (31) is fixed above the base (20) by bolts. The limiting plate (32) is stacked on top of the pad plate (31). The clamp body (10) is stacked on top of the limiting plate (32). The midpoint of the bottom surface of the clamp body (10), the midpoint of the limiting plate (32), and the midpoint of the pad plate (31) are on the same straight line.

4. A lathe fixture for machining a 6-inch 150-pound check valve body according to claim 3, characterized in that, The second adjustment component (40) includes a limiting angle adjustment block (41), an adjustment bolt (42), and a fastening adjustment block (43). The limiting angle adjustment block (41) and the fastening adjustment block (43) are placed side by side on the base (20), and the adjustment bolt (42) passes through both the limiting angle adjustment block (41) and the fastening adjustment block (43).

5. A lathe fixture for machining a 6-inch 150-pound check valve body according to claim 4, characterized in that, The clamping assembly (50) includes a clamping cover plate (51), a clamping bolt (52), and a fastening double-ended screw (53). The clamping cover plate (51) covers the top of the clamp body (10). One end of the fastening double-ended screw (53) passes through the bottom of the clamp body (10), the limiting plate (32), and the pad plate (31) from top to bottom and is connected to the midpoint of the pad plate (31) by a thread. The other end of the fastening double-ended screw (53) is connected to the clamping bolt (52) by a thread. The clamping bolt (52) passes through the clamping cover plate (51). A clamping nut is fitted on the clamping bolt (52). The bottom surface of the clamping nut contacts the top surface of the clamping cover plate (51).

6. A lathe fixture for machining a 6-inch 150-pound check valve body according to claim 5, characterized in that, The adjustment angle of the limit angle adjustment block (41) is 0-4°40 minutes.

7. A lathe fixture for machining a 6-inch 150-pound check valve body according to claim 6, characterized in that, The inclined surface of the limit angle adjusting block (41) is perpendicular to the adjusting bolt (42) to ensure that the direction of the locking force is controllable.

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