A modular tooling fixture mechanism for machining triple eccentric butterfly valve bodies

Abstract

This utility model provides a modular tooling fixture mechanism for machining triple eccentric butterfly valve bodies, belonging to the technical field of fixture mechanisms. This modular tooling fixture mechanism for machining triple eccentric butterfly valve bodies includes a floating clamping module and a quick-change flange positioning base plate. The floating clamping module is disposed above the quick-change flange positioning base plate and is used to float and clamp the triple eccentric butterfly valve body placed on the quick-change flange positioning base plate. The quick-change flange positioning base plate is used to position the triple eccentric butterfly valve body and realize overall transfer between multiple processes. The floating clamping module includes a main frame and a pneumatic auxiliary locking assembly. The main frame adopts a three-way eccentric adjustment mechanism, which has a built-in adjustable wedge block, and the adjustable wedge block is connected to a screw. This solves the problems of eccentric deformation, cumulative positioning errors in multiple processes, and poor tooling versatility in the machining of triple eccentric butterfly valve bodies, eliminates repeated clamping errors, and improves accuracy and efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of fixture mechanism technology, specifically, it relates to a modular tooling fixture mechanism for machining triple eccentric butterfly valve bodies. Background Technology

[0002] In the machining of triple eccentric butterfly valve bodies, modular tooling fixtures are core equipment for ensuring machining accuracy and efficiency. Their main function is to precisely position and stably clamp the triple eccentric butterfly valve body, providing reliable support for subsequent machining processes such as turning and drilling. Modular tooling fixtures typically consist of positioning components, clamping components, and connecting components. The positioning components fix the valve body in the accurate machining position, the clamping components apply appropriate forces to prevent displacement or deformation of the valve body during machining, and the connecting components ensure stable connections between the various parts to adapt to the installation requirements of different machining equipment. The performance of this type of mechanism directly affects the machining quality and production efficiency of triple eccentric butterfly valve bodies, and it occupies an important position in modern valve manufacturing.

[0003] However, traditional modular tooling fixtures used for machining triple eccentric butterfly valve bodies have many drawbacks. In terms of positioning, traditional mechanisms use an integral chuck, which cannot adequately adapt to the asymmetrical eccentric structure of the triple eccentric butterfly valve body. Due to the eccentric design of the valve body, the integral chuck struggles to achieve precise positioning during machining, resulting in excessive circular runout during turning and severely insufficient positioning accuracy, failing to meet the machining precision requirements of the drawings. Regarding clamping, traditional mechanisms lack an effective dynamic compensation mechanism. When machining the valve body, uneven radial force easily leads to eccentric deformation of the valve body, further affecting machining accuracy. In terms of process changeover, traditional tooling fixtures have extremely low changeover efficiency. Different specifications of triple eccentric butterfly valve bodies require a complete change of tooling because the fixed hole layout of the traditional base plate cannot accommodate changes in valve body dimensions. Each tooling change not only consumes a significant amount of time but also requires re-adjustment, greatly reducing production efficiency. Utility Model Content

[0004] In view of this, the present invention provides a modular tooling fixture mechanism for machining triple eccentric butterfly valve bodies, which solves the problems of eccentric deformation, cumulative errors in multi-process positioning, and poor tooling versatility in the machining of triple eccentric butterfly valve bodies, eliminates repeated clamping errors, and improves accuracy and efficiency.

[0005] This utility model is implemented as follows:

[0006] This utility model provides a modular tooling fixture mechanism for machining triple eccentric butterfly valve bodies, comprising a floating clamping module and a quick-change flange positioning base plate; the floating clamping module is disposed above the quick-change flange positioning base plate and is used to float and clamp the triple eccentric butterfly valve body placed on the quick-change flange positioning base plate; the quick-change flange positioning base plate is used to position the triple eccentric butterfly valve body and realize the overall transfer between multiple processes.

[0007] The technical advantages of the modular tooling fixture mechanism for machining triple eccentric butterfly valve bodies provided by this utility model are as follows: By combining the floating clamping module with the quick-change flange positioning base plate, a split-type dynamic compensation fixture system is constructed. The floating clamping module solves the problem of eccentric deformation during the machining of triple eccentric valve bodies, while the quick-change flange positioning base plate realizes the overall transfer between multiple processes, fundamentally reducing the cumulative error caused by multiple clamping operations, significantly improving machining accuracy, and enhancing the versatility of the tooling to adapt to different machining scenarios.

[0008] Based on the above technical solution, the modular tooling fixture mechanism for machining triple eccentric butterfly valve bodies of this utility model can be further improved as follows:

[0009] The floating clamping module includes a main frame and a pneumatically assisted locking assembly. The main frame adopts a three-way eccentric adjustment mechanism with a built-in adjustable wedge block. The adjustable wedge block is connected to a screw, and the eccentricity of the main frame can be adjusted by fine-tuning the screw. The pneumatically assisted locking assembly includes a hydraulic cylinder and a floating jaw. The hydraulic cylinder is driven by the floating jaw and is used to push the floating jaw to adapt to the nonlinear profile of the three-eccentric butterfly valve body and achieve locking.

[0010] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the three-way eccentric adjustment mechanism of the main frame, together with the adjustable wedge block and screw fine adjustment, can accurately adapt to the eccentric structure of the valve body, effectively reduce eccentric deformation, and control the valve body circular runout within the range of ≤0.1mm. The pneumatic assisted locking component pushes the floating jaws through the hydraulic cylinder, which can closely fit the non-linear contour of the valve body, ensuring stable clamping, avoiding the valve body loosening during processing and affecting accuracy, while improving clamping efficiency.

[0011] Furthermore, the main frame is made of steel, and the hydraulic cylinder drives the floating claws to move.

[0012] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: using 45# steel as the main frame material provides sufficient strength and rigidity to withstand various forces during processing, ensuring that the main frame is not easily deformed during long-term use and extending the service life of the fixture. The hydraulic cylinder pushes the floating jaws through a specific transmission path, ensuring stable and precise power transmission, making the floating jaws operate reliably, and further guaranteeing the clamping effect.

[0013] Furthermore, the quick-change flange positioning base plate has a positioning hole in the center and multiple sets of threaded holes around the periphery. The threaded holes are equipped with removable bushings, which can be replaced with different sizes of removable bushings to be compatible with triple eccentric butterfly valve body flanges.

[0014] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the central positioning hole provides an initial positioning reference for the valve body, and the multiple sets of threaded holes around the perimeter, together with the removable bushing, enable the quick-change flange positioning base plate to be compatible with valve body flanges of different sizes. There is no need to replace the entire set of tooling for different specifications of valve bodies, which significantly improves the versatility of tooling, reduces production costs, and shortens changeover time.

[0015] Furthermore, the quick-change flange positioning base plate is provided with a reference surface with a parallelism of 0.03. The reference surface is used for positioning and cooperating with the vehicle clamp. The quick-change flange positioning base plate and the vehicle clamp are connected by a tapered pin for positioning.

[0016] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the high parallelism reference surface on the quick-change flange positioning base plate is connected to the machining fixture via a tapered pin positioning connection, ensuring the positioning accuracy between the base plate and the machining fixture and reducing machining errors caused by base plate installation deviations. The precise tapered pin positioning fit can effectively ensure the relative position of the base plate and the machining fixture is fixed, providing a stable and reliable positioning foundation for subsequent machining.

[0017] Furthermore, the quick-change flange positioning base plate is provided with positioning holes that cooperate with the tapered pin.

[0018] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the positioning hole of a specific size and the tapered pin are matched to achieve precise positioning of the quick-change flange positioning plate and the machining fixture. The fit clearance is small and the positioning accuracy is high, which avoids the shaking or displacement of the plate during the processing, further ensuring the form and position tolerance accuracy of the valve body processing, and making the processed valve body more in line with the drawing requirements.

[0019] Furthermore, the quick-change flange positioning base plate is also provided with a countersunk hole, the size of which is variable through a detachable bushing to adapt to different valve body flanges.

[0020] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the design of multiple specifications of threaded holes and countersunk holes, combined with removable bushings, greatly expands the adaptability of the quick-change flange positioning base plate, which can meet the installation requirements of different valve body flanges. The countersunk hole size can be varied by changing the bushing, making operation simple and convenient, effectively improving the flexibility and versatility of the fixture, and reducing tooling change costs.

[0021] Furthermore, the main frame of the floating clamping module and the quick-change flange positioning base plate are precisely connected through a positioning structure to ensure that the relative position of the clamping center of the floating clamping module on the triple eccentric butterfly valve body and the positioning center of the quick-change flange positioning base plate is accurate.

[0022] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the floating clamping module and the quick-change flange positioning base plate are precisely connected through the positioning structure, ensuring that the relative position of the clamping center and the positioning center is accurate, avoiding problems such as eccentricity and skewing in valve body processing due to positional deviation between the two, further improving the overall accuracy of valve body processing and reducing processing errors.

[0023] Furthermore, after the triple eccentric butterfly valve body is placed on the quick-change flange positioning base plate, the pneumatic assisted locking assembly uses a hydraulic cylinder to drive the floating jaws to achieve pneumatic locking of the triple eccentric butterfly valve body, so as to adapt to valve bodies with different profiles and provide stable clamping force.

[0024] The advantages of adopting the above-mentioned improved scheme are as follows: the pneumatic locking method has a rapid response and can quickly lock after the valve body is placed, saving clamping time. The hydraulic cylinder-driven floating jaws can adapt to valve bodies of different contours, ensuring a stable clamping force for various valve bodies, avoiding valve body displacement during processing, ensuring processing accuracy, and reducing the intensity of manual operation.

[0025] Compared with the prior art, the advantages of the modular tooling fixture mechanism for machining triple eccentric butterfly valve bodies provided by this utility model are:

[0026] This invention addresses the pain points in machining triple-eccentric butterfly valve bodies, bringing significant benefits in several aspects through innovative structural design. Regarding improved machining accuracy, it effectively solves the positioning inaccuracy problem caused by the eccentric structure of traditional tooling. Traditional tooling uses an integral chuck, which cannot adapt to the eccentric design of the valve body, easily leading to eccentric deformation during machining. However, the floating clamping module of this invention has dynamic compensation capabilities, allowing for precise adjustment based on the actual eccentricity of the valve body, significantly reducing the possibility of eccentric deformation. This effectively controls key accuracy indicators such as circular runout during valve body machining, meeting the high-precision requirements of the drawings.

[0027] In terms of process connection and error control, this utility model achieves integrated processing of multiple processes through a quick-change flange positioning base plate. Traditional processing methods require multiple disassembly and assembly of the valve body to complete different processes, resulting in excessive cumulative errors. In contrast, in this utility model, the base plate can carry the entire valve body to different processing equipment, and the same set of positioning holes runs through the entire processing flow, completely eliminating the cumulative errors caused by repeated clamping and ensuring the continuity and consistency of processing accuracy in each process.

[0028] In terms of tooling versatility and changeover efficiency, this invention breaks through the limitations of traditional tooling. Traditional tooling requires replacing the entire set of equipment for different valve body specifications, resulting in long changeover times and high costs. In contrast, the quick-change base plate of this invention adopts a modular hole system design, which can be compatible with valve body flanges of different sizes through detachable bushings, without the need to replace the entire set of tooling. This significantly improves changeover efficiency, reduces the investment cost of production equipment, and enhances the adaptability of tooling to different production needs. Attached Figure Description

[0029] 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.

[0030] Figure 1 This is an example diagram of the floating clamping module of this utility model;

[0031] Figure 2 This is an example diagram of the quick-change flange positioning base plate of this utility model;

[0032] Figure 3 This is an installation diagram of the quick-change flange positioning base plate of this utility model;

[0033] Figure 4 This is an example diagram of a modular tooling fixture mechanism for machining a triple eccentric butterfly valve body;

[0034] The attached diagram lists the components represented by each number as follows:

[0035] 10. Floating clamping module; 11. Main frame; 12. Pneumatic assisted locking assembly; 20. Quick-change flange positioning base plate. Detailed Implementation

[0036] 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.

[0037] like Figures 1-4 The diagram shown is an example of a modular tooling fixture mechanism for machining a triple eccentric butterfly valve body provided by this utility model. It includes a floating clamping module 10 and a quick-change flange positioning base plate 20. The floating clamping module 10 is disposed above the quick-change flange positioning base plate 20 and is used to float and clamp the triple eccentric butterfly valve body placed on the quick-change flange positioning base plate 20. The quick-change flange positioning base plate 20 is used to position the triple eccentric butterfly valve body and realize the overall transfer between multiple processes.

[0038] The first step is to place the triple eccentric butterfly valve body on the quick-change flange positioning base plate; the second step is to activate the floating clamping module to float and clamp the valve body; the third step is to transfer the quick-change flange positioning base plate carrying the valve body to the drilling machine after the turning process is completed; the fourth step is to complete the flange processing on the drilling machine using the quick-change flange positioning base plate.

[0039] In the above technical solution, the floating clamping module 10 includes a main frame 11 and a pneumatic auxiliary locking assembly 12. The main frame 11 adopts a three-way eccentric adjustment mechanism, which has an adjustable wedge block built in it. The adjustable wedge block is connected to a screw, and the eccentricity of the main frame 11 can be adjusted by fine adjustment of the screw. The pneumatic auxiliary locking assembly 12 includes a hydraulic cylinder and a floating claw. The hydraulic cylinder is driven and connected to the floating claw to push the floating claw to adapt to the nonlinear profile of the three-eccentric butterfly valve body and achieve locking.

[0040] After the valve body is placed on the quick-change flange positioning base plate, the adjustable wedge block is driven by the adjusting screw to finely adjust the eccentricity of the main frame 11 to match the eccentricity of the valve body; then the hydraulic cylinder is activated to push the floating claw to move until the floating claw tightly fits the nonlinear contour of the valve body and locks in place.

[0041] Furthermore, in the above technical solution, the main frame 11 is made of steel, and the hydraulic cylinder drives the floating claw to move.

[0042] Furthermore, in the above technical solution, the quick-change flange positioning base plate 20 has a positioning hole in the center and multiple sets of threaded holes around it. The threaded holes are equipped with removable bushings, and different sizes of removable bushings can be replaced to accommodate triple eccentric butterfly valve body flanges.

[0043] Select the appropriate removable bushing based on the dimensions of the valve body flange to be processed; install the removable bushing into the corresponding threaded hole on the quick-change flange positioning base plate; then place the valve body on the base plate so that the valve body flange corresponds to the hole where the bushing is installed.

[0044] Furthermore, in the above technical solution, the quick-change flange positioning base plate 20 is provided with a reference surface with a parallelism of 0.03. The reference surface is used for positioning and cooperating with the vehicle clamp. The quick-change flange positioning base plate 20 and the vehicle clamp are connected by a tapered pin for positioning.

[0045] Furthermore, in the above technical solution, the quick-change flange positioning base plate 20 is provided with positioning holes that cooperate with the tapered pin.

[0046] Furthermore, in the above technical solution, the quick-change flange positioning base plate 20 is also provided with a countersunk hole, and the size of the countersunk hole can be changed through a detachable bushing to adapt to different valve body flanges.

[0047] Furthermore, in the above technical solution, the main frame 11 of the floating clamping module 10 and the quick-change flange positioning base plate 20 are precisely connected through a positioning structure to ensure that the relative position of the clamping center of the floating clamping module 10 on the triple eccentric butterfly valve body and the positioning center of the quick-change flange positioning base plate 20 is accurate.

[0048] Furthermore, in the above technical solution, after the triple eccentric butterfly valve body is placed on the quick-change flange positioning base plate 20, the pneumatic assisted locking assembly 12 drives the floating claws through a hydraulic cylinder to achieve pneumatic locking of the triple eccentric butterfly valve body, so as to adapt to valve bodies with different profiles and provide stable clamping force.

[0049] Example 1:

[0050] This embodiment includes a floating clamping module and a quick-change flange positioning base plate. The main frame of the floating clamping module is made of steel with a three-way eccentric adjustment mechanism and an adjustable wedge block. The eccentricity is finely adjusted by connecting the wedge block with a screw. The pneumatically assisted locking assembly consists of a hydraulic cylinder and a floating jaw connected by a red pipeline. The hydraulic cylinder is driven by a pneumatic control valve, which pushes the floating jaw to move along the valve body contour. The quick-change flange positioning base plate has a central positioning hole and six sets of threaded holes around its perimeter. It has an M20 / M16 removable bushing and a 0.03 parallelism reference surface at the bottom of the base plate. It is positioned with a machining clamp by a tapered pin.

[0051] Suitable for small to medium batch production of triple eccentric butterfly valve bodies in multiple specifications, especially suitable for production lines with high requirements for changeover efficiency. In this scenario, valve body specifications change frequently, requiring rapid adaptation to different flange sizes, and a tight processing schedule is required.

[0052] The pneumatic drive offers rapid response, with the entire process from adjustment to locking taking ≤30 seconds, improving clamping efficiency by 60% compared to traditional four-jaw chucks. The dynamic compensation structure keeps valve body machining runout within 0.08mm, reducing cumulative errors across multiple processes to ±0.05mm. Changing between different valve body specifications can be completed within 5 minutes by replacing the bushing, eliminating the need to adjust the base plate hole system and significantly reducing equipment downtime.

[0053] Example 2:

[0054] In this embodiment, the main frame of the floating clamping module also adopts a three-way eccentric adjustment mechanism. The adjustable wedge block is finely adjusted by connecting the screw to the manual turntable. The pneumatic control component is eliminated, and a manual hydraulic pump drives the hydraulic cylinder instead. The quick-change flange positioning base plate structure is the same as in embodiment one, but the threaded hole bushing is made of wear-resistant alloy material, and an anti-rust coating is added to the base plate reference surface.

[0055] Suitable for single-piece, small-batch, high-precision machining scenarios, especially suitable for production environments lacking a stable air source. These scenarios have stringent requirements for machining accuracy, infrequent valve body replacements, and place greater emphasis on the stable adjustment of clamping force.

[0056] Manual fine-tuning accuracy can reach 0.01mm level. Combined with the stable clamping force of hydraulic locking, the flatness of the valve body sealing surface is ≤0.02mm, meeting high-precision machining requirements. Alloy bushings extend the service life of the substrate by more than 3 times, and the anti-rust coating is suitable for humid processing environments. Although the changeover time increases by 20% compared to the first implementation method, the equipment investment cost is reduced by 40%. No maintenance of the pneumatic system is required, making it suitable for low-cost, high-precision production needs.

[0057] Specifically, the principle of this utility model is as follows:

[0058] The technical principle of this utility model is based on three core concepts: precise positioning, dynamic compensation, and modular adaptation. It achieves efficient and high-precision machining through the synergistic effect of various components. The floating clamping module is the key component for achieving precise clamping and eccentricity compensation. Its main frame adopts a three-way eccentricity adjustment mechanism, with an internal adjustable wedge block and screw forming an adjustment system that can be finely adjusted according to the eccentricity parameters of the three-eccentric butterfly valve body. When the valve body is placed on the base plate, rotating the screw moves the wedge block, changing the eccentricity state of the main frame and adapting the clamping center to the eccentric structure of the valve body. This fundamentally solves the problem that traditional chucks cannot adapt to eccentric structures, achieving precise positioning of the valve body.

[0059] The technical principle of the pneumatic assisted locking assembly lies in utilizing the advantages of hydraulic transmission to achieve stable clamping. The hydraulic cylinder, as the power source, drives the floating jaws through a specific transmission path. The floating jaws can adaptively adjust according to the non-linear profile of the valve body, ensuring a tight fit with the valve body surface. Hydraulic transmission features controllable force and smooth operation, providing sufficient clamping force to prevent displacement of the valve body during machining while avoiding deformation due to excessive clamping force. This achieves precise control of the clamping force and ensures the stability of the machining process.

[0060] The technical principle of the quick-change flange positioning base plate lies in its modular positioning and precise connection design. The positioning hole in the center of the base plate provides an initial positioning reference for the valve body, while multiple sets of threaded holes around it, combined with removable bushings, form an adjustable positioning structure. Valve body flanges of different specifications can be adapted to the base plate's hole system by replacing the bushings of the corresponding size. This modular design gives the base plate wide versatility. Simultaneously, the high parallelism reference surface of the base plate is connected to the machining fixture via tapered pin positioning. Tapered pin positioning features small clearance and high positioning accuracy, ensuring the relative positional accuracy between the base plate and the machining equipment, and providing a stable reference platform for valve body machining.

Claims

1. A modular tooling fixture mechanism for machining triple eccentric butterfly valve bodies, characterized in that, It includes a floating clamping module and a quick-change flange positioning base plate; the floating clamping module is disposed above the quick-change flange positioning base plate and is used to float and clamp the triple eccentric butterfly valve body placed on the quick-change flange positioning base plate; the quick-change flange positioning base plate is used to position the triple eccentric butterfly valve body and realize the overall transfer between multiple processes.

2. The modular tooling fixture mechanism for machining a triple eccentric butterfly valve body according to claim 1, characterized in that, The floating clamping module includes a main frame and a pneumatically assisted locking assembly. The main frame adopts a three-way eccentric adjustment mechanism with a built-in adjustable wedge block. The adjustable wedge block is connected to a screw, and the eccentricity of the main frame can be adjusted by fine-tuning the screw. The pneumatically assisted locking assembly includes a hydraulic cylinder and a floating jaw. The hydraulic cylinder is driven by the floating jaw and is used to push the floating jaw to adapt to the nonlinear profile of the three-eccentric butterfly valve body and achieve locking.

3. A modular tooling fixture mechanism for machining a triple eccentric butterfly valve body according to claim 2, characterized in that, The main frame is made of steel, and the hydraulic cylinder drives the floating claws to move.

4. A modular tooling fixture mechanism for machining a triple eccentric butterfly valve body according to claim 3, characterized in that, The quick-change flange positioning base plate has a positioning hole in the center and multiple sets of threaded holes around it. The threaded holes are equipped with removable bushings, which can be replaced with different sizes of removable bushings to be compatible with triple eccentric butterfly valve body flanges.

5. A modular tooling fixture mechanism for machining a triple eccentric butterfly valve body according to claim 4, characterized in that, The quick-change flange positioning base plate is provided with a reference surface with a parallelism of 0.

03. The reference surface is used for positioning and cooperating with the vehicle clamp. The quick-change flange positioning base plate and the vehicle clamp are connected by a tapered pin.

6. A modular tooling fixture mechanism for machining a triple eccentric butterfly valve body according to claim 5, characterized in that, The quick-change flange positioning base plate is provided with positioning holes that cooperate with the tapered pin.

7. A modular tooling fixture mechanism for machining a triple eccentric butterfly valve body according to claim 6, characterized in that, The quick-change flange positioning base plate is also provided with a countersunk hole, which is sized to be adaptable to different valve body flanges through a detachable bushing.

8. A modular tooling fixture mechanism for machining a triple eccentric butterfly valve body according to claim 7, characterized in that, The main frame of the floating clamping module and the quick-change flange positioning base plate are precisely connected through a positioning structure to ensure that the relative position of the clamping center of the floating clamping module on the triple eccentric butterfly valve body and the positioning center of the quick-change flange positioning base plate is accurate.

9. A modular tooling fixture mechanism for machining a triple eccentric butterfly valve body according to claim 8, characterized in that, After the triple eccentric butterfly valve body is placed on the quick-change flange positioning base plate, the pneumatic assisted locking assembly uses a hydraulic cylinder to drive the floating jaws to achieve pneumatic locking of the triple eccentric butterfly valve body, so as to adapt to valve bodies with different profiles and provide stable clamping force.

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