Three eccentric swash plate type check valve processing frock and processing technology

Abstract

A kind of three eccentric swash plate type check valve machining frock and machining process.The present application includes valve body, valve plate, the included angle between the valve plate surface and the axis of valve body is less than 90 °, the upper end and the lower end of valve body are fixedly installed with upper fixed plate and lower fixed plate, and the upper fixed plate and the lower fixed plate are provided with compression bolt along the axial direction;One end of compression bolt is threadedly connected with upper fixed plate or lower fixed plate, and the other end is pressed on the surface of valve plate, and the position of valve plate is adjusted by rotating compression bolt, to achieve the sealing surface of valve plate and valve body. Its beneficial effect is that the three eccentric swash plate type check valve machining frock is reasonably designed, the machining of connecting shaft hole is carried out after the sealing performance detection of valve body and valve plate is qualified, the purpose of improving the sealing performance of check valve sealing pair is achieved, the closed loop quality control is formed in process route, and the quality of three eccentric swash plate type check valve is effectively improved.

Description

Technical Field

[0001] This invention relates to a triple eccentric swashplate check valve, and more particularly to a tooling and processing technology for manufacturing a triple eccentric swashplate check valve, relating to the field of oil refining equipment technology. Background Technology

[0002] The pneumatic triple-eccentric swashplate check valve is a backflow prevention check valve at the outlet of the main blower in a heavy oil catalytic cracking unit. During normal operation of the heavy oil catalytic cracking unit, the pneumatic triple-eccentric swashplate check valve is normally open; in an emergency, it closes to prevent catalyst-laden gas from flowing back into the main blower, thus protecting the main blower from reverse airflow. The pneumatic triple-eccentric swashplate check valve adopts a butterfly-type triple-eccentric structure, offering advantages such as fast opening speed, low pipeline pressure drop, and good sealing performance. The triple-eccentric swashplate check valve has a unique structure; both the valve plate and valve seat sealing surfaces are conical, making machining difficult and time-consuming. Its sealing effect is mainly determined by two factors: the machining accuracy of the sealing surfaces and the positional accuracy of the valve body and valve plate shaft holes.

[0003] Currently, the manufacturing process of pneumatic triple eccentric swashplate check valves involves first machining the valve plate and valve body separately; then installing the valve plate into the valve body; next, machining the shaft hole connecting the valve body and valve plate using a boring machine; assembling the check valve; and conducting a sealing test. If the sealing test is successful, the check valve manufacturing is complete. If the sealing test fails, the sealing surface and shaft hole position need to be checked, and machining defects need to be repaired by welding before remachining. Therefore, it is evident that quality problems such as incomplete closure and failed sealing tests occur during the manufacturing process of triple eccentric swashplate check valves. There are quality risks in the manufacturing process, specifically, if the quality of the sealing pair machining and whether the relative position is optimal for sealing are not verified before boring the shaft hole, and the sealing test fails after assembly, the shaft hole position will have changed after machining the sealing surface, requiring welding of the shaft hole before re-boring, which is very difficult to adjust. Summary of the Invention

[0004] In order to overcome the shortcomings of existing pneumatic triple eccentric swashplate check valves in the processing of the above-mentioned quality risks, the present invention provides a tooling and processing technology for processing triple eccentric swashplate check valves.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a processing tooling for a triple eccentric swash plate check valve, comprising a valve body and a valve plate, wherein an included angle between a plate surface of the valve plate and an axis of the valve body is less than 90°, an upper fixing plate and a lower fixing plate are respectively fixedly mounted at the upper end and the lower end of the valve body, and compression bolts are axially arranged on the upper fixing plate and the lower fixing plate; one end of each compression bolt is in threaded connection with the upper fixing plate or the lower fixing plate, and the end of the other end presses against the plate surface of the valve plate. The position of the valve plate is adjusted by rotating the compression bolts, so that the sealing surfaces of the valve plate and the valve body are aligned.

[0006] The compression bolts mounted on the upper fixing plate and the lower fixing plate are symmetrically arranged on left and right sides of the axis of the valve body and arranged opposite to each other.

[0007] A T-shaped plate is radially and fixedly arranged in the middle of the annular upper fixing plate and the annular lower fixing plate, and the compression bolts are symmetrically arranged on left and right of the "cross bar" of the T-shaped plate.

[0008] A boss is fixedly arranged at a position of the valve plate corresponding to the compression bolts, and an end surface of the boss is parallel to an end surface of each compression bolt.

[0009] Pressure test blind plates are respectively fixedly mounted on outer sides of the upper fixing plate and the lower fixing plate.

[0010] A pipe joint for supplying compressed air is fixedly mounted on the pressure test blind plate connected to the upper fixing plate; a flow meter is fixedly mounted on the pressure test blind plate connected to the lower fixing plate.

[0011] O-shaped sealing rings are arranged on both end faces of the upper fixing plate and the lower fixing plate.

[0012] A processing process for the triple eccentric swash plate check valve comprises processing the valve plate and the valve body, and mounting the valve plate in the valve body;

[0013] S1. Mounting the upper fixing plate and the lower fixing plate

[0014] Mounting the upper fixing plate and the lower fixing plate on the upper end and the lower end of the valve body respectively.

[0015] S2. Adjusting a gap between sealing surfaces of the valve plate and the valve body

[0016] Mounting and adjusting the compression bolts on the upper fixing plate and the lower fixing plate, so that the sealing surfaces of the valve plate and the valve body are aligned, detecting the gap between the sealing surfaces of the valve body and the valve plate with a 0.02 mm feeler gauge, and the product is qualified if the feeler gauge cannot pass through the sealing surface.

[0017] S3. Mounting pressure test blind plates

[0018] Respectively fixedly mounting pressure test blind plates on outer sides of the upper fixing plate and the lower fixing plate; communicating the pipe joint on the pressure test blind plate at the outer side of the upper fixing plate with a compressed air pipeline; mounting the flow meter on the pressure test blind plate at the outer side of the lower fixing plate.

[0019] S4, Sealing Test

[0020] Compressed air is input to conduct a sealing test on the valve body and valve plate;

[0021] If the test is passed, proceed to the shaft hole machining process S5 for the connecting shaft between the valve body and the valve plate;

[0022] If the test fails, perform S2 again to adjust the gap between the sealing surfaces of the valve plate and the valve body.

[0023] After the test is completed, the test pressure blind flange is removed.

[0024] S5, Shaft Hole Machining

[0025] The valve body, valve plate, upper fixed plate, and lower fixed plate, which have passed the sealing test and had their pressure test blind plate removed, are fixedly connected as a whole and placed on the boring machine worktable and fixed. The shaft hole is then machined according to the process design requirements.

[0026] S6. Install the connecting shaft between the valve body and the valve plate, remove the upper and lower fixing plates, and complete the assembly of the triple eccentric swashplate check valve.

[0027] In step S5, the shaft hole is machined, and the lower fixed plate is fixedly connected to the boring machine table.

[0028] The beneficial effects of this invention are that the machining tooling design of the triple eccentric swashplate check valve is reasonable. After the sealing performance of the valve body and valve plate is tested and qualified, the connecting shaft hole is then machined, thereby improving the sealing performance of the check valve sealing pair. The process route forms a closed-loop quality control, effectively improving the quality of the triple eccentric swashplate check valve. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the machining fixture for the triple eccentric swashplate check valve of the present invention.

[0030] Figure 2 This is a schematic diagram of the lower fixing plate / upper fixing plate structure in this invention.

[0031] Figure 3 This is a schematic diagram of the sealing test structure of the present invention.

[0032] Figure 4 This is a schematic diagram of the shaft hole machining structure of the present invention.

[0033] In the diagram: 1. Valve body, 2. Valve plate, 3. Lower fixed plate, 4. Upper fixed plate, 5. Clamping bolt, 6. Boss, 7. O-ring seal, 8. Test pressure blind plate, 9. Pipeline joint, 10. Flow meter, 11. T-shaped plate, 12. Connecting bolt, 13. Workbench, 14. Boring machine. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments. However, those skilled in the art should understand that the present invention is not limited to the specific embodiments listed, and any embodiment that conforms to the spirit of the present invention should be included within the scope of protection of the present invention.

[0035] In the description of this invention, it should be noted that the terms "vertical", "up", "down", "left", "right", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing or simplifying the description of this invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0036] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "join," and "seal" should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; it can also refer to the internal communication between two components. A seal can be an oil seal, a packing seal, or other sealing methods. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] See appendix Figure 1-4 This invention discloses a machining fixture for a triple eccentric swashplate check valve, comprising a valve body 1 and a valve plate 2. The angle between the surface of the valve plate 2 and the axis of the valve body 1 is less than 90°; preferably, the angle between the surface of the valve plate 2 and the axis of the valve body 1 is 60° to 70°. The sealing surface between the valve body 1 and the valve plate 2 is a conical surface. The valve body 1 and the valve plate 2 are connected by a shaft. After machining the valve body 1 and the valve plate 2 respectively, the valve plate 2 is installed in the valve body 1.

[0038] The upper and lower ends of the valve body 1 are respectively fixedly installed with an upper fixing plate 4 and a lower fixing plate 3 (e.g., ...). Figure 1 As shown, clamping bolts 5 are axially arranged on the upper fixing plate 4 and the lower fixing plate 3. One end of the clamping bolt 5 is threaded to the upper fixing plate 4 or the lower fixing plate 3, and the other end is pressed against the plate surface of the valve plate 2. The threaded end of the clamping bolt 5 is flat and lower than the surface of the upper fixing plate 4 and the lower fixing plate 3. The position of the valve plate 2 is adjusted by rotating the clamping bolt 5 to achieve the sealing surface of the valve plate 2 and the valve body 1.

[0039] Furthermore, the upper fixing plate 4 and the lower fixing plate 3 are annular, and a T-shaped plate 11 is radially fixed in the middle of the annular upper fixing plate 4 and the lower fixing plate 3 (e.g., Figure 2As shown), the vertical section of the T-shaped plate 11 overlaps radially with the upper fixing plate 4 and the lower fixing plate 3; preferably, the length of the vertical section of the T-shaped plate 11 is greater than the radius of the inner hole of the ring; clamping bolts 5 are symmetrically arranged on the horizontal section of the T-shaped plate 11.

[0040] The clamping bolts 5 installed on the upper fixing plate 4 and the lower fixing plate 3 are symmetrically arranged on both sides of the axis of the valve body 1 and face each other. The T-shaped plates 11 of the upper fixing plate 4 and the lower fixing plate 3 face each other, that is, the axes of the clamping bolts 5 on the upper fixing plate 4 and the lower fixing plate 3 do not overlap.

[0041] Furthermore, a boss 6 is fixedly provided at the corresponding position of the valve plate 2 and the clamping bolt 5. The end face of the boss 6 is parallel to the end face of the clamping bolt 5, which facilitates the adjustment of the position of the valve plate 2.

[0042] The upper fixing plate 4 and the lower fixing plate 3 are provided with connecting holes evenly distributed around the circumference on their end faces. Usually, connecting bolts 12 are fixedly installed in the holes on the upper fixing plate 4 and the lower fixing plate 3 that are connected to the valve body 1, and are fixedly connected to the valve body 1 by the connecting bolts 12.

[0043] The upper fixing plate 4 and the lower fixing plate 3 are respectively fixedly installed with pressure testing blind plates 8 (e.g., Figure 3 (As shown).

[0044] The pressure test blind plate 8 connected to the upper fixed plate 4 is fixedly equipped with a pipeline connector 9 for providing compressed air; the pressure test blind plate 8 connected to the lower fixed plate 5 is fixedly equipped with a flow meter 10.

[0045] Furthermore, O-rings 7 are provided on both end faces of the upper fixing plate 4 and the lower fixing plate 3. The O-rings 7 on the inner end face are used to seal the upper fixing plate 4, the lower fixing plate 3 and the end face of the valve body 1, and the O-rings 7 on the outer end face are used to seal the upper fixing plate 4, the lower fixing plate 3 and the end face of the pressure test blind plate 8 (e.g., Figure 3 (As shown).

[0046] A processing technology for the aforementioned triple eccentric swashplate check valve.

[0047] First, process valve plate 2 and valve body 1, and then install valve plate 2 into valve body 1; then...

[0048] S1. Install the upper fixing plate 4 and the lower fixing plate 3.

[0049] Install the upper fixing plate 4 and the lower fixing plate 3 at the upper and lower ends of the valve body 1, respectively.

[0050] S2. Adjust the gap between the sealing surfaces of valve plate 2 and valve body 1.

[0051] Install and adjust the clamping bolts 5 on the upper fixing plate 4 and the lower fixing plate 3 so that the sealing surface of the valve plate 2 and the valve body 1 are in sync. Use a 0.02mm feeler gauge to check the gap between the sealing surfaces of the valve body 1 and the valve plate 2. The fit is acceptable if the feeler gauge cannot penetrate the sealing surface.

[0052] S3. Install the pressure test blind flange 8

[0053] Test pressure blind flanges 8 are fixedly installed on the outer sides of the upper fixed plate 4 and the lower fixed plate 3 respectively; the pipeline joint 9 on the test pressure blind flange 8 on the outer side of the upper fixed plate 4 is connected to the compressed air pipeline; a flow meter 10 is installed on the test pressure blind flange 8 on the outer side of the lower fixed plate 3.

[0054] S4, Sealing Test

[0055] Compressed air is input to conduct a sealing test between valve body 1 and valve plate 2;

[0056] If the test is passed, proceed to the shaft hole machining process S5 for the connecting shaft between valve body 1 and valve plate 2;

[0057] If the test fails, proceed with S2 again to adjust the gap between the sealing surfaces of valve plate 2 and valve body 1.

[0058] After the test is completed, remove the test pressure blind flange 8.

[0059] S5, Shaft Hole Machining

[0060] The valve body 1, valve plate 2, upper fixed plate 4, and lower fixed plate 3, which have passed the sealing test and have had the test pressure blind plate 8 removed, are fixedly connected as an integral assembly on the worktable 13 of the boring machine 14 and fixed. The shaft hole is then machined according to the process design requirements.

[0061] Preferably, the lower fixed plate 3 is fixedly connected to the worktable 13 of the boring machine 14 (e.g., Figure 4 (As shown).

[0062] S6. Install the connecting shaft between valve body 1 and valve plate 2, remove upper fixing plate 4 and lower fixing plate 3, and complete the assembly of the triple eccentric swashplate check valve.

[0063] During step S2, when adjusting the gap between the valve plate 2 and the valve body 1 sealing surfaces, a 0.02mm feeler gauge is used to check the gap between the circumferential sealing surfaces of the valve body 1 and the valve plate 2. If it is confirmed that no feeler gauge can pass through the gap between the sealing surfaces, then step S3 can be performed.

[0064] The present invention utilizes the machining fixture and process for a triple eccentric swashplate check valve. A sealing test is conducted before boring the shaft hole to verify the sealing performance of the sealing pair. This process establishes a closed-loop quality control system. After the check valve sealing pair passes verification, the shaft hole is bored under optimal sealing conditions to improve its sealing effect. This increases the first-pass yield of the check valve boring, reduces the rework rate, and solves the problem of low first-pass yield in sealing tests. Its sealing performance can meet the ANSI 16.1048 CLASS V requirements. Through improved manufacturing processes and the design of specialized fixtures, the valve's sealing performance is enhanced.

[0065] It should be noted that the above embodiments are examples and not limitations of the present invention, and those skilled in the art will be able to design many alternative embodiments without departing from the scope of the claims of this patent.

Claims

1. A method for machining a triple eccentric swashplate check valve, wherein the machining is performed using a machining fixture, the machining fixture comprising: A valve body and a valve plate, wherein an included angle between a plate surface of the valve plate and an axis of the valve body is less than 90°, an upper fixing plate and a lower fixing plate are respectively and fixedly mounted at the upper end and the lower end of the valve body, and compression bolts are axially arranged on the upper fixing plate and the lower fixing plate; one end of each compression bolt is in threaded connection with the upper fixing plate or the lower fixing plate, and the end of the other end is pressed against the plate surface of the valve plate. The position of the valve plate is adjusted by rotating the compression bolts, so that the valve plate is aligned with the sealing surface of the valve body; The compression bolts mounted on the upper fixing plate and the lower fixing plate are symmetrically arranged on two sides of the axis of the valve body and arranged opposite to each other; A boss is fixedly arranged at a position of the valve plate corresponding to the compression bolt, and an end face of the boss is parallel to the end face of the compression bolt; Pressure test blind plates are respectively fixedly mounted on outer sides of the upper fixing plate and the lower fixing plate; A pipe joint for supplying compressed air is fixedly mounted on the pressure test blind plate connected with the upper fixing plate; a flow meter is fixedly mounted on the pressure test blind plate connected with the lower fixing plate; The processing method comprises the following steps: processing a valve plate and a valve body first, and mounting the valve plate in the valve body; characterized in that: S1, Mounting the upper fixing plate and the lower fixing plate Mounting the upper fixing plate and the lower fixing plate on the upper end and the lower end of the valve body respectively; S2, Adjusting a gap between sealing surfaces of the valve plate and the valve body Mounting and adjusting the compression bolts on the upper fixing plate and the lower fixing plate to align the valve plate with the sealing surface of the valve body, detecting the gap between the sealing surfaces of the valve body and the valve plate with a 0.02 mm feeler gauge, and the product is qualified if the feeler gauge cannot pass through the sealing surface; S3, Mounting pressure test blind plates Respectively and fixedly mounting the pressure test blind plates on outer sides of the upper fixing plate and the lower fixing plate; communicating the pipe joint on the pressure test blind plate at an outer side of the upper fixing plate with a compressed air pipeline; mounting the flow meter on the pressure test blind plate at an outer side of the lower fixing plate; S4, Sealing test Inputting compressed air to perform a sealing detection test on the valve body and the valve plate; If the detection test is qualified, proceeding to the shaft hole processing procedure S5 for a connecting shaft of the valve body and the valve plate; If the detection test is unqualified, repeating step S2 to adjust the gap between the sealing surfaces of the valve plate and the valve body; Removing the pressure test blind plates after the test is finished; S5, Shaft hole processing Placing and fixing the integrated assembly of the valve body, the valve plate, the upper fixing plate and the lower fixing plate that has passed the sealing detection test and had the pressure test blind plates removed on a boring machine worktable, and processing shaft holes according to process design requirements; S6, Mounting the connecting shaft of the valve body and the valve plate, removing the upper fixing plate and the lower fixing plate, and completing the assembly of the triple eccentric斜盘式 check valve.

2. The processing method of the triple eccentric swashplate check valve according to claim 1, characterized in that: In the shaft hole processing of step S5, the lower fixing plate is fixedly connected with the boring machine worktable.

3. The method for processing a triple eccentric swashplate check valve according to claim 1, characterized in that: T-shaped plates are radially and fixedly arranged in the middle of the annular upper fixing plate and the annular lower fixing plate, and the compression bolts are symmetrically arranged on the "cross bar" of the T-shaped plate.

4. The method for processing a triple eccentric swashplate check valve according to claim 3, characterized in that: O-shaped sealing rings are arranged on two end faces of the upper fixing plate and the lower fixing plate.

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