Machining tool for multi-caliber three-eccentric center butterfly valve seat

Abstract

The utility model relates to a machining tool for a multi-caliber three-eccentric center butterfly valve seat. The valve seat fixture comprises a first valve seat fixture and a second valve seat fixture, each of the first valve seat fixture and the second valve seat fixture comprises a fixture top surface and a fixture bottom surface, an included angle formed by the fixture top surface and the fixture bottom surface is equal to an included angle formed by a valve seat rotation center line and a valve body channel center line, and the fixture top surfaces are used for supporting a valve body; the bottom cover positioning structure comprises a bottom cover positioning seat and a bottom cover positioning block which are connected, the bottom cover positioning block is connected with the bottom cover shaft head, and the bottom cover positioning seat is used for supporting and positioning the bottom cover positioning block; the filler positioning structure comprises a filler positioning seat and a filler positioning block which are connected, the filler positioning block is connected with the filler box shaft head, and the filler positioning seat is used for supporting and positioning the filler positioning block; the first valve seat tool clamp, the second valve seat tool clamp, the bottom cover positioning seat and the filler positioning seat can be in sliding fit with a machine tool chuck. According to the utility model, the processing difficulty of a complex sealing structure is reduced.

Description

Technical Field

[0001] This utility model relates to the field of butterfly valve processing technology, and in particular to a tooling for processing the seat of a multi-diameter triple eccentric butterfly valve. Background Technology

[0002] Triple eccentric butterfly valves, due to their excellent flow regulation and sealing characteristics, have been among the fastest-growing valve types in the past decade or so, and are widely used in chemical, metallurgical, energy, mining, urban construction, urban water supply, and drainage industries. The variety and quantity of valves used continue to expand, with trends towards high temperature, high pressure, large diameter, high sealing performance, long service life, and multi-functionality. Their reliability and other performance indicators have reached a high level.

[0003] The sealing pair of the triple eccentric butterfly valve is the core component for achieving efficient sealing and stable operation. The sealing pair consists of a sealing ring and a valve seat. The two are tightly fitted through a specific geometric design. The rotation center line of the valve seat and the center line of the valve body channel have a specific inclination angle, resulting in the valve seat sealing surface being an asymmetrical structure of oblique cone, which is difficult to process. Each valve seat of each diameter requires the manufacture of corresponding tooling fixtures. Summary of the Invention

[0004] To address this, this utility model provides a machining fixture for multi-diameter triple eccentric butterfly valve seats. It employs a modular design, and by adjusting the modular positioning mechanism, it can adapt to the machining needs of multiple adjacent diameter valve seats, avoiding the need for repeated fixture preparation. The positioning constraints of the fixture reduce the machining difficulty of complex sealing structures, ensuring the precise forming of the oblique conical shape of the valve seat sealing surface, guaranteeing the consistency and interchangeability of valve seat machining accuracy, and preventing sealing failure due to angular deviations.

[0005] To solve the above-mentioned technical problems, this utility model provides a tooling for machining the seat of a triple eccentric butterfly valve for multiple diameters. The triple eccentric butterfly valve includes a valve body, a valve seat disposed inside the valve body, and bottom cover shafts and stuffing box shafts located at both ends of the valve body.

[0006] The first valve seat tooling fixture and the second valve seat tooling fixture both include a top surface and a bottom surface of the fixture. The angle formed by the top surface and the bottom surface of the fixture is equal to the angle formed by the rotation center line of the valve seat and the center line of the valve body channel. The top surface of the fixture is used to support the valve body.

[0007] The bottom cover positioning structure includes a bottom cover positioning seat and a bottom cover positioning block connected together. The bottom cover positioning block is connected to the bottom cover shaft head, and the bottom cover positioning seat is used to support and position the bottom cover positioning block.

[0008] The packing positioning structure includes a connected packing positioning seat and a packing positioning block. The packing positioning block is connected to the shaft head of the stuffing box, and the packing positioning seat is used for supporting and positioning the packing positioning block.

[0009] The first valve seat fixture, the second valve seat fixture, the bottom cover positioning seat, and the packing positioning seat can all slide and cooperate with the machine tool chuck. The top surfaces of the fixtures of the first valve seat fixture and the second valve seat fixture are arranged in parallel and the spacing is adjustable.

[0010] In one embodiment of this utility model, the bottom surface of the first valve seat tooling fixture and the second valve seat tooling fixture, the bottom cover positioning seat, and the packing positioning seat are all provided with flat keys, and the machine tool chuck is provided with a keyway that mates with the flat key.

[0011] In one embodiment of this utility model, a locking component is further included. The locking component is used to connect to the keyway to connect the machine tool chuck with the first valve seat tooling fixture, the second valve seat tooling fixture, the bottom cover positioning seat, and the packing positioning seat.

[0012] In one embodiment of this utility model, the bolt assembly includes a T-bolt, a nut, and a pressure plate. The keyway is a T-slot. The T-bolt is inserted into the T-slot and passes through the hole in the pressure plate. The nut cooperates with the T-slot to press the pressure plate tightly.

[0013] In one embodiment of this utility model, the machine tool chuck is disc-shaped, and multiple keyways extend radially along the center of the machine tool chuck.

[0014] In one embodiment of this utility model, the bottom cover shaft head is provided with a first connecting hole in the circumferential direction, and the bottom cover positioning block is provided with a first positioning hole in the circumferential direction that cooperates with the first connecting hole.

[0015] In one embodiment of this utility model, the first connecting hole and the first positioning hole are engaged by an internal hexagon screw.

[0016] In one embodiment of this utility model, the stuffing box shaft head is provided with a second connecting hole in the circumferential direction, and the stuffing positioning block is provided with a second positioning hole in the circumferential direction that cooperates with the second connecting hole.

[0017] In one embodiment of this utility model, the second connecting hole and the second positioning hole are engaged by an internal hexagon screw.

[0018] In one embodiment of this utility model, the bottom cover positioning seat includes a first positioning notch, and the bottom cover positioning block is positioned and engaged with the first positioning notch; the filler positioning seat includes a second positioning notch, and the filler positioning block is positioned and engaged with the second positioning notch;

[0019] The valve body can slide downward along the top surface of the fixtures of the first valve seat tooling fixture and the second valve seat tooling fixture under the action of gravity, so that after the bottom cover positioning block and the packing positioning block contact the corresponding bottom cover positioning seat and the packing positioning seat respectively, the rotation center of the valve seat is located on the center line of the machine tool chuck.

[0020] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0021] The present invention provides a multi-diameter triple eccentric butterfly valve seat processing fixture, which is applicable to valves with multiple adjacent diameters, avoiding the need to prepare a set of fixtures for each valve size, thus reducing the enterprise's equipment investment costs and management difficulties.

[0022] This multi-diameter triple eccentric butterfly valve seat tooling fixture adopts a modular design, which makes clamping and positioning convenient. By adjusting the modular positioning mechanism, the production efficiency of mixed-size valve seats can be improved.

[0023] This multi-diameter triple eccentric butterfly valve seat tooling fixture, through the positioning constraints of the tooling fixture, can ensure that the sealing surface form and position tolerances of different batches of valve seats meet the design requirements, guarantee the consistency and interchangeability of valve seat machining accuracy, and avoid sealing failure due to angular deviation. Attached Figure Description

[0024] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0025] Figure 1 This is a schematic diagram of the tooling used for machining the seat of a multi-diameter triple eccentric butterfly valve.

[0026] Figure 2 for Figure 1 A partial sectional view of the right view.

[0027] Figure 3 This is a schematic diagram of the main structure of the first valve seat tooling fixture.

[0028] Figure 4 This is a schematic diagram of the left-side structure of the first valve seat tooling fixture.

[0029] Figure 5 This is a top view of the first valve seat tooling fixture.

[0030] Figure 6 This is a schematic diagram of the main structure of the second valve seat tooling fixture.

[0031] Figure 7 This is a front view schematic diagram of the bottom cover positioning seat.

[0032] Figure 8 This is a front view schematic diagram of the bottom cover positioning block.

[0033] Figure 9 This is a left-side view of the bottom cover positioning block.

[0034] Figure 10 This is a front view schematic diagram of the packing positioning seat.

[0035] Figure 11 This is a front view schematic diagram of the packing positioning block.

[0036] Figure 12 This is a left-side view of the packing positioning block.

[0037] Figure 13 This is a schematic diagram of the main structure of a machine tool chuck.

[0038] Figure 14 This is a cross-sectional structural diagram of a machine tool chuck.

[0039] Explanation of reference numerals in the instruction manual:

[0040] 1. Valve body; 2. Valve seat; 201. Bottom cover shaft head; 202. Stuffing gland shaft head; 3a. First valve seat tooling fixture; 3b. Second valve seat tooling fixture; 301. Top surface of fixture; 302. Bottom surface of fixture; 4. Bottom cover positioning seat; 401. First positioning notch; 5. Bottom cover positioning block; 501. First positioning hole; 6. Stuffing positioning seat; 601. Second positioning notch; 7. Stuffing positioning block; 701. Second positioning hole; 8. Machine tool chuck; 801. Keyway; 9. Flat key. Detailed Implementation

[0041] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0042] In this utility model, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this utility model, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0043] In this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the stated number; "above," "below," "within," etc. are understood to include the stated number. In the description of this utility model, if "first" or "second" is used, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0044] In this utility model, unless otherwise explicitly defined, terms such as "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model based on the specific content of the technical solution.

[0045] Reference Figure 1 As shown, this utility model discloses a tooling for machining the seat of a multi-diameter triple eccentric butterfly valve. The triple eccentric butterfly valve includes a valve body 1, a valve seat 2 disposed inside the valve body 1, and bottom cover shafts 201 and stuffing box shafts 202 located at both ends of the valve body 1.

[0046] The first valve seat fixture 3a and the second valve seat fixture 3b both include a top surface 301 and a bottom surface 302. The angle γ formed by the top surface 301 and the bottom surface 302 is equal to the angle formed by the rotation center line of the valve seat 2 and the channel center line of the valve body 1 (refer to...). Figure 2 As shown in the figure, the top surface 301 of the clamp is used to support the valve body 1;

[0047] The bottom cover positioning structure includes a bottom cover positioning seat 4 and a bottom cover positioning block 5 connected together. The bottom cover positioning block 5 is connected to the bottom cover shaft head 201. The bottom cover positioning seat 4 is used for supporting and positioning the bottom cover positioning block 5.

[0048] The packing positioning structure includes a connected packing positioning seat 6 and a packing positioning block 7. The packing positioning block 7 is connected to the packing gland shaft head 202, and the packing positioning seat 6 is used for supporting and positioning the packing positioning block 7.

[0049] The first valve seat fixture 3a, the second valve seat fixture 3b, the bottom cover positioning seat 4, and the packing positioning seat 6 can all slide with the machine tool chuck 8. The top surfaces 301 of the fixtures of the first valve seat fixture 3a and the second valve seat fixture 3b are arranged in parallel and the spacing is adjustable.

[0050] With the above settings, the valve body 1 is placed on the first valve seat fixture 3a and the second valve seat fixture 3b with a specific inclination (angle γ). Through the positioning constraints of the fixtures, the rotation center of the valve seat 2 is made concentric with the center of the machine tool chuck 8, so as to realize the repeatable manufacturing of the complex geometric structure of the sealing pair.

[0051] In one embodiment, refer to Figures 3 to 6 As shown, the bottom surface 302 of each of the first valve seat tooling fixture 3a and the second valve seat tooling fixture 3b, the bottom cover positioning seat 4, and the packing positioning seat 6 are all provided with flat keys 9. (Refer to...) Figure 13 As shown, the machine tool chuck 8 is provided with a keyway 801 that mates with the flat key 9.

[0052] The first valve seat fixture 3a and the second valve seat fixture 3b are moved along the keyway 801 (left and right) of the machine tool chuck 8. Only the corresponding positioning mechanism (bottom cover positioning seat 4, bottom cover positioning block 5, packing positioning seat 6, packing positioning block 7) is needed to adapt to different sizes and support multiple adjacent valve seats 2 to share the first valve seat fixture 3a and the second valve seat fixture 3b.

[0053] It should be noted that the valve seat 2 and the valve body 1 are integrally cast, with the valve seat 2 located inside the valve body 1. In order to ensure that the dimensions of the first valve seat tooling fixture 3a and the second valve seat tooling fixture 3b are consistent, the first valve seat tooling fixture 3a and the second valve seat tooling fixture 3b are first spot welded together, and after being precision machined by a machining center, the weld seam is ground off and they are used separately.

[0054] Specifically, it also includes a locking assembly for connecting to the keyway 801 to connect the machine tool chuck 8 to the first valve seat tooling fixture 3a, the second valve seat tooling fixture 3b, the bottom cover positioning seat 4, and the packing positioning seat 6. In one embodiment, the bolt assembly includes a T-bolt, a nut, and a pressure plate. The keyway 801 is a T-slot, the T-bolt is inserted into the T-slot and passes through the hole in the pressure plate, and the nut cooperates with the T-slot to press the pressure plate tight.

[0055] Understandably, the T-bolt is inserted into the T-slot of the machine tool chuck 8, with the head of the T-bolt embedded in the T-slot and the threaded portion protruding upwards. One end (through hole) of the clamping plate is then fitted onto the threaded portion of the T-bolt, so that the clamping plate rests against the surface of the fixture or workpiece to be fixed. Finally, the nut is screwed onto the threaded end of the T-bolt. Once the nut is tightened, it will firmly press the clamping plate against the surface of the fixture, thus creating a strong clamping force.

[0056] In one embodiment, refer to Figure 13 , Figure 14As shown, the machine tool chuck 8 is disc-shaped, and multiple keyways 801 extend radially along the center of the machine tool chuck 8.

[0057] In one embodiment, refer to Figure 9 As shown, the bottom cover shaft head 201 is provided with a first connecting hole in the circumference, and the bottom cover positioning block 5 is provided with a first positioning hole 501 in the circumference that cooperates with the first connecting hole. The first connecting hole and the first positioning hole 501 are connected by an internal hex screw.

[0058] In one embodiment, refer to Figure 12 As shown, the stuffing box shaft head 202 is provided with a second connecting hole in the circumferential direction, and the stuffing positioning block 7 is provided with a second positioning hole 701 in the circumferential direction that mates with the second connecting hole. The second connecting hole and the second positioning hole 701 are engaged by an internal hex screw.

[0059] Specifically, refer to Figure 7 As shown, the bottom cover positioning seat 4 includes a first positioning notch 401, and the bottom cover positioning block 5 is positioned and engaged with the first positioning notch 401 and is cylindrical; see reference. Figure 10 As shown, the packing positioning seat 6 includes a second positioning notch 601, and the packing positioning block 7 is positioned and engaged with the second positioning notch 601 and is cylindrical.

[0060] The valve body 1 can slide downward along the top surface 301 of the respective fixtures of the first valve seat tooling fixture 3a and the second valve seat tooling fixture 3b under the action of gravity, so that after the bottom cover positioning block 5 and the packing positioning block 7 contact the corresponding bottom cover positioning seat 4 and the packing positioning seat 6, the rotation center of the valve seat 2 is located on the center line of the machine tool chuck 8.

[0061] In use, according to the size of the valve seat 2, the first valve seat fixture 3a and the second valve seat fixture 3b are translated along the keyway 801 of the machine tool chuck 8 to ensure that the bottom cover shaft head 201 and stuffing box shaft head 202 at both ends of the valve body 1 can extend out of the fixture. After the position is determined, the T-bolt is inserted into the T-slot of the machine tool chuck 8, and the first valve seat fixture 3a and the second valve seat fixture 3b are fixed to the machine tool chuck 8 respectively using pressure plates and nuts.

[0062] Connect the bottom cover positioning block 5 and the packing positioning block 7 to the shaft ends of both ends of the valve body 1 using hexagonal socket screws. Then, place the valve body 1 on the top surface 301 of the first valve seat fixture 3a and the second valve seat fixture 3b. Due to gravity, the valve body 1 slides downward along the top surface 301 of the first valve seat fixture 3a and the second valve seat fixture 3b. When the bottom cover positioning block 5 and the packing positioning block 7 are in contact with the bottom cover positioning seat 4 and the packing positioning seat 6 respectively, the rotation center of the valve seat 2 is exactly located on the center line of the machine tool chuck 8. At this time, use a dial indicator to correct the inner cavity of the valve body 1. By tapping the bottom cover positioning seat 4 and the packing positioning seat 6, make the rotation center of the valve seat 2 concentric with the center of the machine tool chuck 8. Then, use a pressure plate and nut to fix the bottom cover positioning seat 4 and the packing positioning seat 6 to the machine tool chuck 8. At the same time, use a pressure plate and nut to fix the valve body 1 to the machine tool chuck 8. The cutting tool performs cutting along the conical surface at an angle.

[0063] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A tooling fixture for machining the seat of a multi-diameter triple eccentric butterfly valve, the triple eccentric butterfly valve comprising a valve body (1), a valve seat (2) disposed inside the valve body (1), and bottom cover shaft ends (201) and stuffing box shaft ends (202) located at both ends of the valve body (1), characterized in that, include: The first valve seat tooling fixture (3a) and the second valve seat tooling fixture (3b) both include a top surface (301) and a bottom surface (302). The angle formed by the top surface (301) and the bottom surface (302) is equal to the angle formed by the rotation center line of the valve seat (2) and the channel center line of the valve body (1). The top surface (301) is used to support the valve body (1). The bottom cover positioning structure includes a connected bottom cover positioning seat (4) and a bottom cover positioning block (5). The bottom cover positioning block (5) is connected to the bottom cover shaft head (201). The bottom cover positioning seat (4) is used for supporting and positioning the bottom cover positioning block (5). The packing positioning structure includes a connected packing positioning seat (6) and a packing positioning block (7), wherein the packing positioning block (7) is connected to the packing gland shaft head (202), and the packing positioning seat (6) is used for supporting and positioning the packing positioning block (7); Among them, the first valve seat tooling fixture (3a), the second valve seat tooling fixture (3b), the bottom cover positioning seat (4), and the packing positioning seat (6) can all slide and cooperate with the machine tool chuck (8). The top surfaces (301) of the fixtures of the first valve seat tooling fixture (3a) and the second valve seat tooling fixture (3b) are arranged in parallel and the spacing is adjustable.

2. The tooling for machining a multi-diameter triple eccentric butterfly valve seat according to claim 1, characterized in that, The first valve seat tooling fixture (3a) and the second valve seat tooling fixture (3b) are each provided with a flat key (9) on their respective fixture bottom surface (302), the bottom cover positioning seat (4), and the packing positioning seat (6), and the machine tool chuck (8) is provided with a keyway (801) that mates with the flat key (9).

3. The tooling for machining a multi-diameter triple eccentric butterfly valve seat according to claim 2, characterized in that, It also includes a locking assembly for connecting to the keyway (801) to connect the machine tool chuck (8) to the first valve seat tooling fixture (3a), the second valve seat tooling fixture (3b), the bottom cover positioning seat (4), and the packing positioning seat (6).

4. The tooling for machining a multi-diameter triple eccentric butterfly valve seat according to claim 3, characterized in that, The bolt assembly includes a T-bolt, a nut, and a pressure plate. The keyway (801) is a T-slot. The T-bolt is inserted into the T-slot and passes through the hole in the pressure plate. The nut cooperates with the T-slot to press the pressure plate tightly.

5. The tooling for machining a multi-diameter triple eccentric butterfly valve seat according to claim 2, characterized in that, The machine tool chuck (8) is disc-shaped, and multiple keyways (801) extend radially along the center of the machine tool chuck (8).

6. The tooling for machining a multi-diameter triple eccentric butterfly valve seat according to claim 1, characterized in that, The bottom cover shaft head (201) is provided with a first connecting hole in the circumferential direction, and the bottom cover positioning block (5) is provided with a first positioning hole (501) in the circumferential direction that cooperates with the first connecting hole.

7. The tooling for machining a multi-diameter triple eccentric butterfly valve seat according to claim 6, characterized in that, The first connecting hole and the first positioning hole (501) are connected by an internal hex screw.

8. The tooling for machining a multi-diameter triple eccentric butterfly valve seat according to claim 1, characterized in that, The stuffing box shaft head (202) is provided with a second connecting hole in the circumferential direction, and the stuffing positioning block (7) is provided with a second positioning hole (701) in the circumferential direction that cooperates with the second connecting hole.

9. The tooling for machining a multi-diameter triple eccentric butterfly valve seat according to claim 8, characterized in that, The second connecting hole and the second positioning hole (701) are engaged by an internal hex screw.

10. The tooling for machining a multi-diameter triple eccentric butterfly valve seat according to claim 1, characterized in that, The bottom cover positioning seat (4) includes a first positioning notch (401), and the bottom cover positioning block (5) is positioned and engaged with the first positioning notch (401); the filler positioning seat (6) includes a second positioning notch (601), and the filler positioning block (7) is positioned and engaged with the second positioning notch (601); The valve body (1) can slide downward along the top surface (301) of the first valve seat tooling fixture (3a) and the second valve seat tooling fixture (3b) under the action of gravity, so that after the bottom cover positioning block (5) and the packing positioning block (7) contact the corresponding bottom cover positioning seat (4) and the packing positioning seat (6) respectively, the rotation center of the valve seat (2) is located on the center line of the machine tool chuck (8).

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