Machining tool for sealing surface of three-eccentric center butterfly valve body

Abstract

The invention discloses a three-eccentric center butterfly valve body sealing face machining tool, belongs to the technical field of valve machining, and aims to solve the problems that an existing three-eccentric center butterfly valve body sealing line is low in machining precision, and valve body interchangeability is poor. Comprising a swash plate and a positioning plate, the swash plate comprises a top plate and a bottom plate which are connected, the included angle between the top plate and the bottom plate is arranged according to the included angle between the axis of the valve body and the axis of the valve seat cone, the positioning plate is connected with the top plate, and a positioning convex spigot is formed in the upper end face of the positioning plate. According to the three-eccentric center butterfly valve sealing conical surface positioning and machining device, precise positioning and machining of the valve seat sealing conical surface of the valve body can be achieved, manual alignment is not needed, the machining precision is high, interchangeability exists between valve bodies of a three-eccentric center butterfly valve, and the field maintenance difficulty is lowered.

Description

Technical Field

[0001] The invention belongs to the technical field of valve processing, and in particular relates to a tool for processing the sealing surface of a valve body of a triple-eccentric butterfly valve. Background Art

[0002] Three-eccentric butterfly valves are widely used in the petrochemical and power plant fields. At present, most domestic butterfly valve manufacturers use single-matching processing. This method has low processing efficiency and will cause poor interchangeability of valve sealing rings. When internal leakage occurs during on-site use, maintenance is difficult. Summary of the invention

[0003] The purpose of the present invention is to provide a three-eccentric butterfly valve body sealing surface processing tool to solve the problems of low processing accuracy of the existing three-eccentric butterfly valve body sealing line and poor valve body interchangeability. The technical solution adopted by the present invention is as follows:

[0004] A three-eccentric butterfly valve body sealing surface processing tool, comprising a slanted plate and a positioning plate;

[0005] The inclined plate includes a top plate and a bottom plate connected to each other, the bottom plate is horizontally arranged, the lower end surface of the bottom plate is a first reference end surface, the bottom plate is provided with an alignment inner hole, the top plate is inclinedly arranged, the upper end surface of the top plate is a second reference end surface, the angle between the first reference surface and the second reference surface is set according to the angle between the axis of the valve body and the axis of the valve seat cone, the top plate is provided with a positioning inner hole, a plurality of first pin holes and a plurality of screw holes, the plurality of first pin holes and the plurality of screw holes are arranged along a first circular line drawn on the second reference surface, and the first circular line is coaxial with the positioning inner hole;

[0006] The lower end surface of the positioning plate abuts against the upper end surface of the top plate, and the upper end surface of the positioning plate is a third reference surface, on which a positioning convex stop, a plurality of countersunk holes and a plurality of second pin holes are provided, and the plurality of second pin holes and the plurality of countersunk holes are arranged along a second circular line delineated on the third reference surface, and the plurality of countersunk holes are connected to the plurality of screw holes one by one through screws, and the plurality of first pin holes and the plurality of second pin holes are matched one by one through positioning pins;

[0007] The outer circumference of the valve body is provided with a shaft shoulder structure, the inner hole of the positive end of the valve body is plugged and matched with the positioning convex stop, and a plurality of groups of clamping devices are arranged on the circumference of the positioning plate, and the clamping device includes a support rod, a screw rod and a pressure block, the lower end of the support rod and the lower end of the screw rod are respectively threadedly connected with the positioning plate, and the screw rod and the support rod are arranged from near to far from the positioning convex stop, the upper end surface of the support rod is flush with the upper end surface of the shaft shoulder structure, the upper end of the screw rod passes through the middle part of the pressure block and is threadedly connected with the first nut, the lower end surface of the first nut is pressed against the upper end surface of the pressure block, one end of the pressure block is pressed on the upper end surface of the corresponding support rod, and the other end of the pressure block is pressed on the upper end surface of the shaft shoulder structure;

[0008] The axis of the positioning convex stop is set to be offset upward by X compared to the center of the second circle line along the third reference plane, the first reference plane is set to intersect with the axis of the alignment inner hole at point B, the first reference plane is set to intersect with the axis of the positioning inner hole at point C, the first reference plane is set to intersect with the axis of the positioning convex stop at point D, the axis of the positioning convex stop and the axis of the alignment inner hole are set to intersect at point E, the third reference plane is set to intersect with the axis of the positioning convex stop at point F, the second reference plane is set to intersect with the axis of the positioning convex stop at point G, the angle between the positioning convex stop and the axis of the alignment inner hole is set to P, then X and P satisfy the following two formulas:

[0009] X=cosP*Q

[0010] Q+O=N+Y+S*sinP

[0011] Where:

[0012] Q is the distance between point C and point D, O is the distance between point B and point C, N is the distance between point D and point G, Y is the distance between point F and point G, S is the distance between point E and point F, and the angle of P is equal to the angle between the first reference plane and the second reference plane.

[0013] Furthermore, the distance between the bottom plate and the top plate is set to gradually become closer from left to right, the right part of the bottom plate and the right part of the top plate are hinged, the left part of the bottom plate is detachably connected to the lower end of the support plate, and the left part of the top plate is detachably connected to the upper end of the support plate.

[0014] Furthermore, two long grooves are arranged on the left and right parts of the upper end surface of the base plate, and the upper end surface of the support plate is composed of a first supporting slope and a second supporting slope connected on the left and right, and the first supporting slope and the second supporting slope are successively lower from left to right, and the angle between the first supporting slope and the horizontal plane is 8°, and the angle between the second supporting slope and the horizontal plane is 12°. When the angle between the machined valve body axis and the valve seat cone axis is 8°, the lower end of the support plate is plug-fitted with the long groove on the left, and the lower end surface of the top plate is butted against the first supporting slope. When the angle between the machined valve body axis and the valve seat cone axis is 12°, the lower end of the support plate is plug-fitted with the long groove on the right, and the lower end surface of the top plate is butted against the second supporting slope.

[0015] Furthermore, two inner ring coaxial bearing seats are arranged at the front and rear of the right upper end surface of the bottom plate, and two inner hole coaxial connecting ears are arranged at the right lower end surface of the top plate. The rotating shaft passes through the two connecting ears, and the inner rings of the two bearing seats are respectively engaged with the rotating shaft.

[0016] Furthermore, the two ends of the rotating shaft are respectively threadedly matched with two second nuts, and the two second nuts are respectively connected with two connecting ears.

[0017] Furthermore, it also includes a measuring rod and a gasket. A V-shaped groove is provided on the upper end surface of the gasket, and a guide strip is provided on the bottom of the gasket. The guide strip and the V-shaped groove are arranged in the same direction. A guide groove is provided on the upper end surface of the positioning convex stop, and the guide groove is arranged obliquely along the third reference plane. The measuring rod includes a connecting pipe and two tips. Third nuts are coaxially arranged at both ends of the connecting pipe. The outer peripheries of the two tips are threadedly connected with the two third nuts respectively, and the tips are threadedly matched with the fourth nut. The fourth nut is tightened against the third nut on the same side. When measuring whether the valve seat sealing surface of the valve body is qualified, the gasket is fitted on the positioning convex stop, and the guide strip is plugged into the guide groove. The outer periphery of the connecting pipe is tangent to the two inclined surfaces of the V-shaped groove respectively. The V-shaped groove is determined according to the height of the valve seat sealing line of the valve body and the diameter of the connecting pipe. The relative positions of the two tips and the connecting pipe are adjusted so that the tips of the two tips are respectively pressed against the two ends of the elliptical major axis of the valve seat sealing line of the valve body.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. Fix the inclined plate on the chuck of the vertical lathe, and use the alignment inner hole for clamping and alignment, so that the alignment inner hole coincides with the machining rotation center of the vertical lathe, and the first reference end face can facilitate the alignment of the inner hole. Clamp the valve body to the tooling, and then the sealing surface of the valve body can be processed by the vertical lathe to achieve precise positioning and processing of the valve seat sealing cone surface of the valve body, without the need for manual alignment, and with high machining accuracy, so that the valve bodies of the three-eccentric butterfly valves are interchangeable, reducing the difficulty of on-site maintenance.

[0020] 2. By changing the connection position of the support plate, two angles can be created between the bottom plate and the top plate to accommodate the processing of valve body sealing surfaces of more specifications.

[0021] 3. The sealing surface of the three-eccentric butterfly valve is obtained by intercepting a cone and two parallel surfaces that are not parallel to the bottom plane. The distance between two points in the 180° direction in any plane is different, and only the minimum or maximum distance can be measured, which makes the measurement relatively difficult. At the same time, the sealing line of the valve body sealing surface is in the middle of the sealing surface. If the size of the sealing line position is determined by measuring the dimensions at both ends, the angle error generated during the processing will cause errors in the sealing line size. After the processing is completed, the positioning convex stop of the pad and the positioning plate are matched, and the measuring rod is placed in the V-shaped groove. At this time, the tip of the measuring rod end is exactly at the two ends of the long axis of the valve seat sealing line ellipse. The sealing line of the valve body is measured by the measuring rod, which is convenient and has high measurement accuracy. The total length of the measuring rod can be adjusted by screwing the fourth nut and the top. After the measurement is completed, the measuring rod can also be taken out for calibration with a micrometer. The height of the pad and the outer diameter of the measuring rod are calculated by the sealing line position. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1It is a schematic diagram of the structure of the present invention;

[0023] Figure 2 It is a relationship diagram of the external dimension parameters of the present invention;

[0024] Figure 3 yes Figure 1 AA section view;

[0025] Figure 4 It is a schematic diagram of the structure of the swash plate;

[0026] Figure 5 is a structural schematic diagram of the support plate;

[0027] Figure 6 It is a schematic diagram of the structure of the positioning plate;

[0028] Figure 7 It is a schematic diagram of the structure of the pad;

[0029] Figure 8 It is a schematic diagram of the structure of the measuring rod;

[0030] Fig. 9 It is a cross-sectional view of the sealing surface of the valve body before machining;

[0031] Fig.10 It is a cross-sectional view of the sealing surface of the valve body after processing.

[0032] In the figure, 1. bottom plate, 2. support plate, 3. top plate, 4. positioning plate, 5. measuring rod, 6. spacer, 7. positioning pin, 8. slide bar, 9. pressure block, 10. first nut, 11. screw rod, 12. second nut, 13. connecting ear, 14. rotating shaft, 15. seat bearing, 16. long groove, 17. supporting inclined surface, 18. top, 19. fourth nut, 20. third nut, 21. connecting pipe, 22. positioning convex stop, 23. second circular line, 24. aligning inner hole, 25. second pin hole, 26. countersunk hole, 27. countersunk hole, 28. second circular line, 29. aligning inner hole, 30. aligning inner hole, 31. first supporting inclined surface, 32. guide groove, 33. guide strip, 34. V-shaped groove. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0034] The connection mentioned in the present invention is divided into fixed connection and detachable connection. The fixed connection is a non-detachable connection including but not limited to conventional fixed connection methods such as folding connection, rivet connection, bonding connection and welding connection. The detachable connection includes but not limited to conventional detachable methods such as bolt connection, snap connection, pin connection and hinge connection. When the specific connection method is not clearly defined, it is assumed that at least one connection method can be found in the existing connection methods to achieve the function, and those skilled in the art can choose according to their needs. For example: welding connection is selected for fixed connection, and bolt connection is selected for detachable connection.

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings. The following embodiments are provided to explain the present invention, but the present invention is not limited to the following embodiments.

[0036] Example: Figures 1 to 10 As shown, a three-eccentric butterfly valve body sealing surface processing tooling includes a slant plate and a positioning plate 4;

[0037] The swash plate includes a top plate 3 and a bottom plate 1 connected to each other, the bottom plate 1 is horizontally arranged, the lower end surface of the bottom plate 1 is a first reference end surface, the bottom plate 1 is provided with an alignment inner hole 24, the top plate 3 is tiltedly arranged, the upper end surface of the top plate 3 is a second reference end surface, the angle between the first reference surface and the second reference surface is set according to the angle between the axis of the valve body 27 and the axis of the valve seat cone, the top plate 3 is provided with a positioning inner hole 28, a plurality of first pin holes 30 and a plurality of screw holes 29, the plurality of first pin holes 30 and the plurality of screw holes 29 are arranged along a first circular line drawn on the second reference surface, and the first circular line is coaxial with the positioning inner hole 28;

[0038] The lower end surface of the positioning plate 4 abuts against the upper end surface of the top plate 3. The positioning plate 4, the top plate 3 and the bottom plate 1 are all plate-shaped components whose two end surfaces are parallel to each other. The upper end surface of the positioning plate 4 is a third reference surface. The third reference surface is provided with a positioning convex stop 22, a plurality of countersunk holes 26 and a plurality of second pin holes 25. The plurality of second pin holes 25 and the plurality of countersunk holes 26 are arranged along a second circular line 23 delineated on the third reference surface. The plurality of countersunk holes 26 are connected to the plurality of screw holes 29 in a one-to-one correspondence through screws. The plurality of first pin holes 30 and the plurality of second pin holes 25 are matched in a one-to-one correspondence through positioning pins 7.

[0039] The outer periphery of the valve body 27 is provided with a shoulder structure, the inner hole of the positive end of the valve body 27 is plugged into the positioning convex stop 22, and a plurality of groups of clamping devices are provided on the circumference of the positioning plate 4, the clamping device comprises a support rod 8, a screw rod 11 and a pressure block 9, the lower ends of the support rod 8 and the lower ends of the screw rod 11 are respectively threadedly connected with the positioning plate 4, the screw rod 11 and the support rod 8 are arranged from near to far from the positioning convex stop 22, the upper end surface of the support rod 8 is flush with the upper end surface of the shoulder structure, the upper end of the screw rod 11 passes through the middle of the pressure block 9, and is threadedly connected with the first nut 10, the lower end surface of the first nut 10 is pressed against the upper end surface of the pressure block 9, one end of the pressure block 9 is pressed on the upper end surface of the corresponding support rod 8, and the other end of the pressure block 9 is pressed on the upper end surface of the shoulder structure;

[0040] The axis of the positioning convex stop 22 is set to be offset upward by X along the third reference plane compared to the center of the second circle line 23, the first reference plane is set to intersect with the axis of the alignment inner hole 24 at point B, the first reference plane is set to intersect with the axis of the positioning inner hole 28 at point C, the first reference plane is set to intersect with the axis of the positioning convex stop 22 at point D, the axis of the positioning convex stop 22 is set to intersect with the axis of the alignment inner hole 24 at point E, the third reference plane is set to intersect with the axis of the positioning convex stop 22 at point F, the second reference plane is set to intersect with the axis of the positioning convex stop 22 at point G, the angle between the axis of the positioning convex stop 22 and the axis of the alignment inner hole 24 is set to P, then X and P satisfy the following two formulas:

[0041] X=cosP*Q

[0042] Q+O=N+Y+S*sinP

[0043] Where:

[0044] Q is the distance between point C and point D, O is the distance between point B and point C, N is the distance between point D and point G, Y is the distance between point F and point G, S is the distance between point E and point F, and the angle of P is equal to the angle between the first reference plane and the second reference plane.

[0045] The inclined plate is fixed on the chuck of the vertical lathe, and the alignment inner hole 24 is used for clamping and alignment, so that the alignment inner hole 24 coincides with the processing rotation center of the vertical lathe, and the first reference end face can facilitate the alignment of the alignment inner hole 24. S and P are design-related parameters of the valve body, O and N are preset values ​​of the present invention, and Y is the thickness of the positioning plate 4. X is obtained according to the above formula, and then the valve body 27 is clamped to the tooling, and the sealing surface of the valve body 27 can be processed by the vertical lathe to achieve precise positioning and processing of the valve seat sealing cone surface of the valve body 27. No manual alignment is required, and the processing accuracy is high, so that the valve bodies of the three-eccentric butterfly valves are interchangeable, reducing the difficulty of on-site maintenance.

[0046] The distance between the bottom plate 1 and the top plate 3 is set to gradually become closer from left to right, the right part of the bottom plate 1 and the right part of the top plate 3 are hinged, the left part of the bottom plate 1 is detachably connected to the lower end of the support plate 2, and the left part of the top plate 3 is detachably connected to the upper end of the support plate 2.

[0047] Two long grooves 16 are arranged on the left and right sides of the upper end surface of the bottom plate 1. The upper end surface of the support plate 2 is composed of a first support inclined surface 31 and a second support inclined surface 17 connected to each other on the left and right. The first support inclined surface 31 and the second support inclined surface 17 are successively lowered from left to right. The angle between the first support inclined surface 31 and the horizontal plane is 8°, and the angle between the second support inclined surface and the horizontal plane is 12°. When the angle between the axis of the processed valve body 27 and the axis of the valve seat cone is 8°, the lower end of the support plate 2 is plugged into the long groove 16 on the left, and the lower end surface of the top plate 3 is abutted against the first support inclined surface 31. When the angle between the axis of the processed valve body 27 and the axis of the valve seat cone is 12°, the lower end of the support plate 2 is plugged into the long groove 16 on the right, and the lower end surface of the top plate 3 is abutted against the second support inclined surface 17. By changing the connection position of the support plate 2, two angles can be formed between the bottom plate 1 and the top plate 3 to adapt to the processing of valve body sealing surfaces of more specifications.

[0048] Two inner ring coaxial bearings 15 are arranged at the front and rear of the right upper end surface of the bottom plate 1, and two inner hole coaxial connecting ears 13 are arranged at the right lower end surface of the top plate 3. The rotating shaft 14 passes through the two connecting ears 13, and the inner rings of the two bearings 15 are respectively sleeved and matched with the rotating shaft 14.

[0049] Two ends of the rotating shaft 14 are respectively threadedly matched with two second nuts 12 , and the two second nuts 12 are respectively connected with two connecting ears 13 .

[0050] It also includes a measuring rod 5 and a cushion block 6. A V-shaped groove 34 is provided on the upper end surface of the cushion block 6. A guide strip 33 is provided at the bottom of the cushion block 6. The guide strip 33 and the V-shaped groove 34 are arranged in the same direction. A guide groove 32 is provided on the upper end surface of the positioning convex stop 22. The guide groove 32 is arranged obliquely along the third reference plane. The measuring rod 5 includes a connecting tube 21 and two tops 18. The two ends of the connecting tube 21 are coaxially provided with third nuts 20. The outer peripheries of the two tops 18 are respectively threadedly connected with the two third nuts 20. The opposite ends of the two tops 18 are inserted into the connecting tube 21. The tops 18 are threaded with the fourth nuts 19. The fourth nut 19 is tightened against the third nut 20 on the same side to fasten the tip 18. When measuring whether the valve seat sealing surface of the valve body 27 is qualified, the gasket 6 is fitted on the positioning convex stop 22, and the guide strip 33 is plugged into the guide groove 32. The outer periphery of the connecting pipe 21 is tangent to the two inclined surfaces of the V-shaped groove 34 respectively. The V-shaped groove 34 is determined according to the height of the valve seat sealing line of the valve body 27 and the diameter of the connecting pipe 21. The relative positions of the two tips 18 and the connecting pipe 21 are adjusted so that the tips of the two tips 18 are respectively against the two ends of the major axis of the ellipse of the valve seat sealing line of the valve body 27.

[0051] The sealing surface of the three-eccentric butterfly valve is obtained by intercepting a cone and two parallel surfaces that are not parallel to the bottom plane. The distance between two points in the 180° direction in any plane is different, and only the minimum or maximum distance can be measured, which makes the measurement relatively difficult. At the same time, the sealing line of the sealing surface of the valve body 27 is in the middle position of the sealing surface. If the size of the sealing line position is determined by measuring the dimensions of its two ends, the angle error generated during the processing will cause errors in the size of the sealing line. After the processing is completed, the positioning convex stop 22 of the cushion block 6 and the positioning plate 4 are matched, and the measuring rod 5 is placed in the V-shaped groove 34. At this time, the tip of the measuring rod 5 is exactly at the two ends of the long axis of the valve seat sealing line ellipse. The sealing line of the valve body 27 is measured by the measuring rod 5, which is convenient to measure and has high measurement accuracy. By screwing the fourth nut 19 and the top 18, the total length of the measuring rod 5 can be adjusted. After the measurement is completed, the measuring rod 5 can also be taken out for calibration with a micrometer. The height of the cushion block 6 and the outer diameter of the measuring rod 5 are calculated by the sealing line position.

[0052] The above embodiments are merely exemplary descriptions of the present invention and do not limit its protection scope. Those skilled in the art may also make partial changes thereto, which are within the protection scope of the present invention as long as they do not exceed the spirit of the present invention.

Claims

1. A three-eccentric butterfly valve body sealing surface processing tool, characterized by: It includes a swash plate and a positioning plate (4); The swash plate comprises a top plate (3) and a bottom plate (1) connected to each other, the bottom plate (1) being arranged horizontally, the lower end surface of the bottom plate (1) being a first reference end surface, the bottom plate (1) being provided with an alignment inner hole (24), the top plate (3) being arranged obliquely, the upper end surface of the top plate (3) being a second reference end surface, the angle between the first reference surface and the second reference surface being arranged according to the angle between the axis of the valve body (27) and the axis of the valve seat cone, the top plate (3) being provided with a positioning inner hole (28), a plurality of first pin holes (30) and a plurality of screw holes (29), the plurality of first pin holes (30) and the plurality of screw holes (29) being arranged along a first circular line drawn on the second reference surface, the first circular line being coaxial with the positioning inner hole (28); The lower end surface of the positioning plate (4) abuts against the upper end surface of the top plate (3); the upper end surface of the positioning plate (4) is a third reference surface; the third reference surface is provided with a positioning convex stop (22), a plurality of countersunk holes (26) and a plurality of second pin holes (25); the plurality of second pin holes (25) and the plurality of countersunk holes (26) are arranged along a second circular line (23) delineated on the third reference surface; the plurality of countersunk holes (26) and the plurality of screw holes (29) are connected in a one-to-one correspondence manner through screws; the plurality of first pin holes (30) and the plurality of second pin holes (25) are matched in a one-to-one correspondence manner through positioning pins (7); The outer periphery of the valve body (27) is provided with a shoulder structure, the inner hole of the positive end of the valve body (27) is plugged into the positioning convex stop (22), and a plurality of clamping devices are arranged on the upper circumference of the positioning plate (4), the clamping device comprising a support rod (8), a screw rod (11) and a pressure block (9), the lower end of the support rod (8) and the lower end of the screw rod (11) are respectively threadedly connected to the positioning plate (4), the screw rod (11) and the support rod (8) are arranged from near to far from the positioning convex stop (22), the upper end surface of the support rod (8) is flush with the upper end surface of the shoulder structure, the upper end of the screw rod (11) passes through the middle of the pressure block (9) and is threadedly connected to the first nut (10), the lower end surface of the first nut (10) is pressed against the upper end surface of the pressure block (9), one end of the pressure block (9) is pressed on the upper end surface of the corresponding support rod (8), and the other end of the pressure block (9) is pressed on the upper end surface of the shoulder structure; The axis of the positioning convex stop (22) is set to be offset upward by X compared to the center of the second circle line (23) along the third reference plane, the first reference plane is set to intersect with the axis of the alignment inner hole (24) at point B, the first reference plane is set to intersect with the axis of the positioning inner hole (28) at point C, the first reference plane is set to intersect with the axis of the positioning convex stop (22) at point D, the axis of the positioning convex stop (22) and the axis of the alignment inner hole (24) intersect at point E, the third reference plane is set to intersect with the axis of the positioning convex stop (22) at point F, the second reference plane is set to intersect with the axis of the positioning convex stop (22) at point G, the angle between the positioning convex stop (22) and the axis of the alignment inner hole (24) is P, then X and P satisfy the following two formulas: X=cosP*Q (Q+O)=(N+Y+S)*sinP Where: Q is the distance between point C and point D, O is the distance between point B and point C, N is the distance between point D and point G, Y is the distance between point F and point G, S is the distance between point E and point F, and the angle of P is equal to the angle between the first reference plane and the second reference plane.

2. A triple eccentric butterfly valve body sealing surface machining tool according to claim 1, characterized in that: The distance between the bottom plate (1) and the top plate (3) is set to gradually become closer from left to right, the right part of the bottom plate (1) and the right part of the top plate (3) are hinged, the left part of the bottom plate (1) is detachably connected to the lower end of the support plate (2), and the left part of the top plate (3) is detachably connected to the upper end of the support plate (2).

3. A triple eccentric butterfly valve body sealing surface machining tool according to claim 2, characterized in that: The left upper end surface of the bottom plate (1) is provided with two long grooves (16) on the left and right sides. The upper end surface of the support plate (2) is composed of a first support inclined surface (31) and a second support inclined surface (17) connected on the left and right sides. The first support inclined surface (31) and the second support inclined surface (17) are successively lowered from left to right. The angle between the first support inclined surface (31) and the horizontal plane is 8°, and the angle between the second support inclined surface and the horizontal plane is 12°. When the valve body (2) is processed 7) When the angle between the axis and the axis of the valve seat cone is 8°, the lower end of the support plate (2) is plugged into the long groove (16) on the left, and the lower end surface of the top plate (3) is abutted against the first supporting inclined surface (31). When the angle between the axis of the processed valve body (27) and the axis of the valve seat cone is 12°, the lower end of the support plate (2) is plugged into the long groove (16) on the right, and the lower end surface of the top plate (3) is abutted against the second supporting inclined surface (17).

4. A triple eccentric butterfly valve body sealing surface machining tool according to claim 2, characterized in that: Two inner ring coaxial bearing seats (15) are arranged at the front and rear of the right part of the upper end surface of the bottom plate (1), and two inner hole coaxial connecting ears (13) are arranged at the right part of the lower end surface of the top plate (3). The rotating shaft (14) passes through the two connecting ears (13), and the inner rings of the two bearing seats (15) are respectively sleeved and matched with the rotating shaft (14).

5. A triple eccentric butterfly valve body sealing surface machining tool according to claim 4, characterized in that: The two ends of the rotating shaft (14) are respectively threadedly matched with two second nuts (12), and the two second nuts (12) are respectively connected with two connecting ears (13).

6. A triple eccentric butterfly valve body sealing surface machining tool according to any one of claims 1 to 5, characterized in that: The measuring rod (5) and a cushion block (6) are also included. A V-shaped groove (34) is provided on the upper end surface of the cushion block (6). A guide strip (33) is provided on the bottom of the cushion block (6). The guide strip (33) and the V-shaped groove (34) are arranged in the same direction. A guide groove (32) is provided on the upper end surface of the positioning convex stop (22). The guide groove (32) is arranged obliquely along the third reference plane. The measuring rod (5) includes a connecting tube (21) and two tops (18). Third nuts (20) are coaxially provided at both ends of the connecting tube (21). The outer circumferences of the two tops (18) are respectively threadedly connected to the two third nuts (20). The top (18) and the fourth nut (19) are threadedly matched. The fourth nut (19) is tightened against the third nut (20) on the same side. When measuring whether the valve seat sealing surface of the valve body (27) is processed to be qualified, the gasket (6) is placed on the positioning convex stop (22), and the guide strip (33) is plugged into the guide groove (32). The outer periphery of the connecting pipe (21) is respectively tangent to the two inclined surfaces of the V-shaped groove (34). The V-shaped groove (34) is determined according to the height of the valve seat sealing line of the valve body (27) and the diameter of the connecting pipe (21). The relative positions of the two tips (18) and the connecting pipe (21) are adjusted so that the tips of the two tips (18) are respectively pressed against the two ends of the long axis of the ellipse of the valve seat sealing line of the valve body (27).

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