A high-precision grinding equipment for triple eccentric butterfly valve sealing pair

Abstract

The present application discloses a high-precision grinding device for a three-eccentric butterfly valve sealing pair, which belongs to the technical field of grinding equipment. The device includes a machine body, a machine base, a rotating seat, a crossbeam, a grinding head slide, a workbench, a dynamic and static pressure grinding head electronic axis, an X-axis moving assembly, a Z-axis moving assembly, and a swing angle driving mechanism. The X-axis moving assembly is used to drive the lateral slide to move, and the swing angle driving mechanism is used to drive the rotating seat to rotate relative to the machine base. The present application sets a swing angle driving mechanism, an X-axis moving assembly, and a Z-axis moving assembly. The grinding wheel always moves on the grinding sealing surface of the workpiece during the grinding process, that is, it follows the grinding. The ideal finish of the grinding surface of the sealing pair reaches less than Ra0.2, and the grinding inner and outer roundness reaches 0.003mm. The processing time is fully utilized, the grinding efficiency is improved, the grinding force is uniform, the grinding accuracy is improved, and the compatibility and sealing of the three-eccentric butterfly valve sealing pair are guaranteed, so that the sealing pair is 100% interchangeable.

Description

Technical Field

[0001] The present application belongs to the technical field of grinding equipment and relates to a high-precision grinding equipment for a triple-eccentric butterfly valve sealing pair. Background Art

[0002] As a new type of high-performance valve, the triple-eccentric butterfly valve is increasingly used in various industries. This type of valve has a series of advantages, such as good sealing performance, small opening resistance, wear compensation, and self-locking when closed. However, the shape, size and surface quality of the sealing surface of this valve are key factors affecting the sealing performance, and high-quality processing of the sealing surface has always been a difficult point for manufacturers.

[0003] At present, the grinding processing method of triple-eccentric butterfly valve mainly adopts multi-axis interpolation processing, which will result in frequent cutting and cutting actions, which is not conducive to precision assurance and causes excessive ineffective grinding time. Summary of the invention

[0004] In order to perform follow-up grinding on the sealing pair and improve the grinding accuracy and grinding efficiency, a high-precision grinding device for the sealing pair of a triple-eccentric butterfly valve is provided.

[0005] The present application provides a high-precision grinding device for a triple-eccentric butterfly valve sealing pair, which is specifically implemented by the following technical solutions:

[0006] A high-precision grinding equipment for a three-eccentric butterfly valve sealing pair, comprising a machine body, a machine base, a rotating seat, a crossbeam, a grinding head slide, a workbench for clamping the three-eccentric butterfly valve sealing pair, a dynamic and static pressure grinding head electronic axis, an X-axis moving assembly, a Z-axis moving assembly and a swing angle driving mechanism, wherein the crossbeam is arranged on the machine body, the machine base is fixed with a transverse slide, the transverse slide and the crossbeam are horizontally slidably matched, the X-axis moving assembly is used to drive the transverse slide to move, and the machine base is fixed with a horizontally arranged fixed axis; the rotating seat is provided with a rotating sleeve, the rotating sleeve is coaxially rotatably connected with the fixed axis, and the swing angle driving mechanism is used to drive the rotating seat to rotate relative to the machine base; the grinding head slide is slidably matched with the rotating seat, the Z-axis moving assembly is used to drive the grinding head slide to move, the grinding head slide is provided with a dynamic and static pressure grinding head electronic axis, and a grinding wheel is provided at the end of the dynamic and static pressure grinding head electronic axis; the workbench is installed on the machine body and is located below the dynamic and static pressure grinding head electronic axis.

[0007] Through the above technical scheme, by setting the swing angle drive mechanism, the X-axis moving component and the Z-axis moving component, the workbench can realize the workpiece position control, and the traditional interpolation grinding method can be omitted when grinding the conical surface of the sealing pair. The swing angle drive mechanism drives the rotating seat, the Z-axis moving component, the grinding head slide, the dynamic and static pressure grinding head electronic axis and the grinding wheel to rotate and position as a whole according to the taper requirements of the workpiece. Only one coordinate of the Z-axis needs to be moved to complete the follow-up grinding of the conical surface, avoiding the grinding error caused by the difference in dynamic response characteristics of each coordinate axis and the difference in motion accuracy in the traditional interpolation grinding method, and can obtain higher grinding shape accuracy and grinding surface quality, so that the ideal finish of the grinding surface of the sealing pair reaches below Ra0.2.

[0008] Secondly, the grinding wheel always moves on the grinding sealing surface of the workpiece during the grinding process, which fully utilizes the processing time, improves the grinding efficiency, makes the grinding force uniform, improves the grinding accuracy, and ensures the compatibility and sealing of the sealing pair of the three-eccentric butterfly valve, achieving 100% interchangeability of the sealing pair.

[0009] Optionally, it also includes a first locking mechanism, and the swing angle drive mechanism includes a driving motor, a first gear and an arc-shaped rack, wherein the driving motor is installed on a machine base, the first gear is installed on the output shaft of the driving motor, the arc-shaped rack is fixed to the rotating seat, and the curvature center of the arc-shaped rack is located on the axis of the rotating sleeve, the arc-shaped rack is meshed with the first gear, the first locking mechanism includes a first driving assembly and two first driving disks, the first driving disk is provided on the fixed shaft, the first driving disk is coaxially arranged with the rotating sleeve, a first conical surface is provided at the outer edge of the first driving disk, two first fixing rings are coaxially fixed to the inner wall of the rotating sleeve, a second conical surface is provided at the inner diameter of the first fixing ring, and the first driving assembly is used to drive the two first driving disks to move closer to each other until the first conical surface matches the second conical surface.

[0010] Through the above technical scheme, firstly, through the cooperation of the arc-shaped rack and the first gear, the gear cooperation accuracy is higher than that of the traditional worm gear, which can improve the swing angle accuracy and grinding accuracy of the grinding wheel, and secondly, when the swing angle is adjusted, through the first locking mechanism, the two first drive disks are close to each other to clamp the first fixed ring, that is, to achieve a fixed connection between the fixed shaft and the rotating sleeve to lock the rotating sleeve, so as to cope with the impact load, so as to reduce the wear caused by the impact load on the arc-shaped rack and the first gear, thereby ensuring the stability of the cooperation accuracy.

[0011] Furthermore, the coaxiality between the fixed shaft and the rotary sleeve is improved through the cooperation between the first conical surface and the second conical surface, thereby improving the rotation accuracy of the rotary sleeve.

[0012] Optionally, the first drive assembly includes a first screw rod, a first drive structure and a guide rod, wherein the first screw rod is coaxially arranged with the rotating sleeve, the first screw rod is threadedly connected with the first drive disk, the threads of the two first drive disks are arranged in opposite directions, the first drive structure is used to drive the first screw rod to rotate, the guide rod is fixedly connected with the fixed shaft, and the guide rod slides through the first drive disk.

[0013] Through the above technical solution, when the first driving structure drives the first screw rod to rotate, the two first driving disks are driven to move toward each other through the threaded connection, thereby clamping the first fixing ring, and the setting of the guide rod is used to limit the spin of the first driving disk.

[0014] Optionally, the first drive assembly includes a first screw rod, a first drive structure and a rotating ring, the rotating ring is coaxially fixed with the first drive disk, the outer circumference of the rotating ring is in contact with the inner circumference of the rotating sleeve, the first screw rod is eccentrically arranged with the rotating sleeve, the first screw rod is threadedly connected to the first drive disk, the threads of the two first drive disks are arranged in opposite directions, and the first drive structure is used to drive the first screw rod to rotate.

[0015] Through the above technical solution, when the first driving structure drives the first screw rod to rotate, the two first driving discs are driven to move toward each other through the threaded connection, thereby clamping the first fixing ring.

[0016] The fitting of the rotating ring and the inner circumference of the rotating sleeve can limit the eccentric rotation of the first drive disk driven by the friction force of the first screw rod, thereby ensuring that the first screw rod can stably drive the first drive disk to move axially.

[0017] Optionally, it also includes a second locking mechanism, the second locking mechanism includes a second driving assembly and two second driving disks, the fixed shaft is provided with the second driving disk, the second driving disk is coaxially arranged with the rotating sleeve, the two second driving disks are respectively located on the upper side and the lower side of the first driving disk, a third conical surface is provided at the outer edge of the second driving disk, two second fixing rings are coaxially fixed on the inner wall of the rotating sleeve, the two second fixing rings are respectively located on the upper side and the lower side of the first fixing ring, a fourth conical surface is provided at the inner diameter of the second fixing ring, the second driving assembly is used to drive the two second driving disks to move away from each other until the third conical surface matches the fourth conical surface; the first driving assembly includes a first screw rod and a first driving structure, the second driving assembly includes a second screw rod and The second driving structure, the first screw rod and the second screw rod are both parallel to the axis of the rotating sleeve, the first screw rod and the second screw rod are both eccentrically arranged with the rotating sleeve, the first screw rod is threadedly connected to the first driving disk, the threads of the two first driving disks are arranged in opposite directions, the first driving structure is used to drive the first screw rod to rotate, the second screw rod is threadedly connected to the second driving disk, the threads of the two second driving disks are arranged in opposite directions, and the second driving structure is used to drive the second screw rod to rotate; the first driving disk is penetrated by a first guide hole, the outer peripheral surface of the second screw rod has a second matching portion that fits against the inner wall of the first guide hole, the second driving disk is penetrated by a second guide hole, and the outer peripheral surface of the first screw rod has a first matching portion that fits against the inner wall of the second guide hole.

[0018] Through the above technical scheme, firstly, by setting the first locking mechanism and the second locking mechanism, the first drive disk and the second drive disk are matched with the first fixing ring and the second fixing ring respectively, and the matching area is large, thereby greatly improving the braking effect on the rotating sleeve; and, by setting the first matching portion, the first guide hole, the second matching portion and the second guide hole, that is, the second screw rod can stop the first drive disk from rotating, and the first screw rod can stop the second drive disk from rotating, thereby ensuring that the first drive disk and the second drive disk can stably move axially.

[0019] Optionally, the first conical surface is provided with a circle of serrated first meshing teeth, the second conical surface is provided with a circle of serrated second meshing teeth, the third conical surface is provided with a circle of serrated third meshing teeth, and the fourth conical surface is provided with a circle of serrated fourth meshing teeth; the tip of the second meshing tooth of the first fixing ring and the tip of the fourth meshing tooth of the second fixing ring are located in the same radial plane, the tip of the first meshing tooth of the first driving disk and the recess of the third meshing tooth of the second driving disk are located in the same radial plane, the moving distances of the two first driving disks are consistent, the moving distances of the two second driving disks are consistent, the inclined surface of the second meshing tooth is used to be fitted with the inclined surface of the first meshing tooth, and the inclined surface of the fourth meshing tooth is used to be fitted with the inclined surface of the third meshing tooth.

[0020] Through the above technical scheme, by setting the first meshing tooth, the second meshing tooth, the third meshing tooth, and the fourth meshing tooth and limiting the position of each tip, when the two first meshing teeth approach each other to contact the second meshing tooth, and the two third meshing teeth move away from each other to contact the fourth meshing tooth, one of the inclined surfaces of the two first meshing teeth is simultaneously in contact with the corresponding inclined surfaces of the two second meshing teeth (the moving strokes of the two first meshing teeth are consistent), and the circumferential component of force received by the corresponding inclined surface is set to f2; one of the inclined surfaces of the two third meshing teeth is simultaneously in contact with the corresponding inclined surfaces of the two fourth meshing teeth (the moving strokes of the two third meshing teeth are consistent), and the circumferential component of force received by the corresponding inclined surface is set to f1. Since the inclination direction of the corresponding inclined surface of the fourth meshing tooth is opposite to that of the corresponding inclined surface of the second meshing tooth, the direction of f1 is opposite to that of f2, and f1 and f2 abut against each other, that is, the first meshing tooth and the third meshing tooth circumferentially limit the rotating sleeve, thereby greatly improving the locking and braking effect of the rotating sleeve.

[0021] Optionally, the second interlocking tooth includes a first half-tooth and a second half-tooth separately arranged, and the first half-tooth and the second half-tooth are both integrally connected to the second conical surface through the first tooth root, and there is a gap between the first half-tooth and the second half-tooth and the second conical surface respectively, and there is a gap between the first half-tooth and the second half-tooth; the fourth interlocking tooth includes a third half-tooth and a fourth half-tooth separately arranged, and the third half-tooth and the fourth half-tooth are both integrally connected to the fourth conical surface through the second tooth root, and there is a gap between the third half-tooth and the fourth half-tooth and the fourth conical surface respectively, and there is a gap between the third half-tooth and the fourth half-tooth.

[0022] Through the above technical solution, the second biting teeth and the fourth biting teeth are separately arranged, so that the second biting teeth and the fourth biting teeth have elastic deformation capabilities. When subjected to the circumferential force of the first biting teeth and the third biting teeth, the second biting teeth and the fourth biting teeth will undergo adaptive elastic deformation, thereby making the fitting and biting effect stronger.

[0023] Optionally, an end cover is fixed to one end of the rotating sleeve, and a ring groove is coaxially provided on the surface of the end cover; one end of the first screw rod and the second screw rod are rotatably connected to the fixed shaft, and the other ends of the first screw rod and the second screw rod are located in the ring groove; the ends of the first screw rod and the second screw rod away from the fixed shaft are commonly connected to a connecting plate, and the two ends of the connecting plate are respectively provided for the first screw rod and the second screw rod to pass through and rotatably connect.

[0024] Through the above technical solution, by providing an annular groove and a connecting plate, the free ends of the first screw rod and the second screw rod are limited in multiple directions to improve the position stability of the first screw rod and the second screw rod, thereby improving the braking effect of the rotating sleeve.

[0025] Optionally, a center rod is coaxially fixed in the rotating sleeve, and a through hole for the center rod to pass through is penetrated at the center of the first driving disk and the second driving disk, and a plurality of ring plates corresponding to the first driving disk and the second driving disk are fixed on the outer circumference of the center rod, and the outer edges of the ring plates abut against the outer circumferences of the first screw rod and the second screw rod, and the outer edges of the ring plates are integrally formed with inclined spring plates, and the spring plates are evenly arranged around the circumference, and a guide ring is coaxially fixed to the orifice of the through hole, and the inner diameter of the guide ring abuts against the inclined surface of the spring plate; when the first driving disk and the second driving disk retract, the spring plate is elastically compressed and deformed.

[0026] Through the above technical solution, the cooperation between the guide ring and the inclined surface of the spring piece can play a centering role on the first drive disk and the second drive disk, so that the first drive disk and the second drive disk are kept in a coaxial state with the rotating sleeve, thereby improving the clamping effect of the first drive disk and the second drive disk; and the elastic force of the spring piece will be applied to the first drive disk and the second drive disk through the guide ring, thereby reducing the axial movement of the first drive disk and the second drive disk caused by the thread matching clearance.

[0027] Optionally, a first rubber layer is provided at a matching position between the first conical surface and the second conical surface, and a second rubber layer is provided at a matching position between the third conical surface and the fourth conical surface.

[0028] Through the above technical solution, the first rubber layer and the second rubber layer can improve the matching friction force, thereby improving the braking effect.

[0029] The beneficial effects of this application are:

[0030] 1. By setting the swing angle drive mechanism, X-axis moving assembly and Z-axis moving assembly, the worktable can realize workpiece position control. When grinding the conical surface of the sealing pair, the traditional interpolation grinding method can be omitted. The swing angle drive mechanism drives the rotating seat, Z-axis moving assembly, grinding head slide, dynamic and static pressure grinding head electronic axis and grinding wheel to rotate and position according to the workpiece taper requirements. Only one coordinate of the Z axis needs to be moved to complete the follow-up grinding of the conical surface. The grinding error caused by the difference in dynamic response characteristics and motion accuracy of each coordinate axis in the traditional interpolation grinding method is avoided, and higher grinding shape accuracy and grinding surface quality can be obtained, so that the ideal finish of the grinding surface of the sealing pair reaches below Ra0.2, and the grinding inner and outer roundness reaches 0.003mm;

[0031] 2. The grinding wheel always moves on the grinding sealing surface of the workpiece during the grinding process, making full use of the processing time, improving the grinding efficiency, uniform grinding force, and improving the grinding accuracy. It can also ensure the compatibility and sealing of the three-eccentric butterfly valve sealing pair, achieving 100% interchangeability of the sealing pair;

[0032] 3. Through the cooperation of the arc-shaped rack and the first gear, the gear cooperation accuracy is higher than that of the worm gear, which can improve the swing angle accuracy and grinding accuracy of the grinding wheel. Secondly, after the swing angle is adjusted, through the first locking mechanism, the two first drive disks are close to each other to clamp the first fixed ring, that is, to achieve a fixed connection between the fixed shaft and the rotating sleeve to lock the rotating sleeve, so as to cope with the impact load, so as to reduce the wear caused by the impact load on the arc-shaped rack and the first gear, thereby ensuring the stability of the cooperation accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of Example 1.

[0034] Figure 2 This is a cross-sectional view of the base of Example 1.

[0035] Figure 3 It is a partial cross-sectional view of the rotary sleeve of Example 1.

[0036] Figure 4 yes Figure 3 A partial enlarged view of point A in the middle.

[0037] Figure 5 It is a partial cross-sectional view of the rotary sleeve of Example 2.

[0038] Figure 6 yes Figure 5 A partial enlarged view of point B in the middle.

[0039] Figure 7 It is a partial cross-sectional view of the rotary sleeve of Example 3.

[0040] Figure 8 yes Figure 7 A partial enlarged view of point C in the middle.

[0041] Fig. 9 It is a partial cross-sectional view of the rotary sleeve of Example 4.

[0042] Fig.10 It is a partial cross-sectional view of the rotary sleeve of Example 5.

[0043] Fig.11 yes Fig.10 A partial enlarged view of point D in the middle.

[0044] Fig.12 It is a schematic diagram of Example 5 for demonstrating the matching relationship between the guide ring and the spring piece.

[0045] Fig.13 It is a schematic diagram of Example 6 for showing the positional relationship between the first meshing tooth, the second meshing tooth, the third meshing tooth, and the fourth meshing tooth.

[0046] Fig.14yes Fig.13 A partial enlarged view of point E in the middle.

[0047] Fig.15 yes Fig.13 A partial enlarged view of point F in the middle.

[0048] Fig.16 It is a schematic diagram of Example 7 for showing the positional relationship between the first meshing tooth and the second meshing tooth.

[0049] Fig.17 It is a schematic diagram of Example 7 for showing the positional relationship between the third interlocking teeth and the fourth interlocking teeth.

[0050] Explanation of reference numerals: 1. first drive disk; 2. second drive disk; 10. base; 101. rotating base; 103. electronic axis of dynamic and static pressure grinding head; 104. grinding wheel; 105. arc rack; 106. first gear; 107. driving motor; 11. first screw rod; 110. fixed shaft; 111. second gear; 112. first rack; 113. first fixed ring; 114. first cone surface; 115. second cone surface; 116. first rubber layer; 117. rotating ring; 1100. guide rod; 120. rotating sleeve; 121. end cover; 1210. ring groove; 1211. connecting plate; 1212. center rod; 130. fixed cylinder; 140. bearing; 15. first guide hole; 20, third cone surface; 201, second rubber layer; 21, second screw rod; 211, third gear; 212, second rack; 22, second fixed ring; 221, fourth cone surface; 23, second guide hole; 24, through hole; 241, ring piece; 242, spring piece; 243, guide ring; 31, first meshing tooth; 32, second meshing tooth; 321, first half tooth; 322, second half tooth; 323, first tooth root; 33, third meshing tooth; 34, fourth meshing tooth; 341, third half tooth; 342, fourth half tooth; 343, second tooth root; 51, machine body; 52, crossbeam; 53, transverse slide; 54, grinding head slide; 55, Z-axis moving assembly; 56, workbench. DETAILED DESCRIPTION

[0051] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the attached Figure 1-Figure 17 Shown in.

[0052] In the description of this specification, the description with reference to the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0053] Example 1

[0054] Example 1 discloses a high-precision grinding device for a triple-eccentric butterfly valve sealing pair, such as Figure 1 , Figure 2 , Figure 3 As shown, the high-precision grinding equipment for the three-eccentric butterfly valve sealing pair includes a machine body 51, a machine base 10, a rotating seat 101, a crossbeam 52, a grinding head slide 54, a workbench 56, an X-axis moving assembly (not shown in the figure), a Z-axis moving assembly 55, a swing angle driving mechanism and a first locking mechanism, wherein the workbench 56 is installed on the machine body 51, and the workbench 56 is used to clamp the three-eccentric butterfly valve sealing pair. When the main shaft of the machine body 51 drives the workbench 56 to rotate, the workbench 56 drives the three-eccentric butterfly valve sealing pair.

[0055] The base 10 is fixed with a transverse slide 53, which is horizontally slidably matched with the crossbeam 52. The X-axis moving assembly is used to drive the transverse slide 53 to move, thereby driving the base 10 to move along the X-axis direction. In this embodiment, the X-axis moving assembly is a combination of a ball screw structure and a servo motor to convert rotational motion into linear motion to drive the base 10 to move along the X-axis direction.

[0056] The machine base 10 is fixed with a horizontally arranged fixed shaft 110, and the rotating base 101 is fixed with a rotating sleeve 120. The rotating sleeve 120 is coaxially rotatably connected with the fixed shaft 110. In addition, in order to improve the rotation stability, a fixed cylinder 130 is also fixed on the surface of the machine base 10. The rotating sleeve 120 passes through the fixed cylinder 130, and the rotating sleeve 120 is coaxially rotatably connected with the fixed cylinder 130 through a bearing 140.

[0057] The swing angle drive mechanism is used to drive the rotating seat 101 to rotate relative to the machine base 10, and the rotation range of the rotating seat 101 is ±25°. Specifically, the swing angle drive mechanism includes a drive motor 107, a first gear 106 and an arc-shaped rack 105, wherein the drive motor 107 is installed on the machine base 10, the first gear 106 is installed on the output shaft of the drive motor 107, the arc-shaped rack 105 is fixed to the rotating seat 101, and the curvature center of the arc-shaped rack 105 is located on the axis center of the rotating sleeve 120, and the arc-shaped rack 105 is meshed with the first gear 106.

[0058] The grinding head slide 54 is slidably matched with the rotating seat 101, and the Z-axis moving component 55 is used to drive the grinding head slide 54 to move. In this embodiment, the Z-axis moving component 55 is a combination of a ball screw structure and a servo motor to convert rotational motion into linear motion, so as to drive the grinding head slide 54, the dynamic and static pressure grinding head electronic axis 103 and the grinding wheel to move along the Z-axis direction.

[0059] The grinding head slide 54 is provided with a dynamic and static pressure grinding head electronic axis 103. The power of the dynamic and static pressure grinding head electronic axis 103 can be configured to 30KW or 15KW according to the grinding requirements. The axial runout error of the dynamic and static pressure grinding head electronic axis 103 is ±0.003mm, and the radial runout error of the dynamic and static pressure grinding head electronic axis 103 is ±0.003mm.

[0060] The dynamic and static pressure grinding head electronic axis 103 is located above the workbench 56 , and a grinding wheel 104 is provided at the lower end of the dynamic and static pressure grinding head electronic axis 103 .

[0061] like Figure 3 , Figure 4 As shown, the first locking mechanism includes a first drive assembly and two first drive disks 1, the first drive assembly includes a first screw rod 11, a first drive structure and a guide rod 1100, wherein the first screw rod 11 is coaxially arranged with the rotating sleeve 120, one end of the first screw rod 11 is rotatably connected to the fixed shaft 110, and the other end of the first screw rod 11 abuts against the end cover 121 of the rotating sleeve 120.

[0062] The first driving disc 1 is coaxially arranged with the rotating sleeve 120 , and the two first driving discs 1 are distributed up and down. A first conical surface 114 is arranged at the outer edge of the first driving disc 1 , and a first rubber layer 116 is covered and fixed on the first conical surface 114 .

[0063] One end of the guide rod 1100 is fixedly connected to the fixed shaft 110 . The guide rod 1100 is parallel to the axis of the rotating sleeve 120 . The guide rod 1100 passes through the two first driving disks 1 , so that the first driving disks 1 and the guide rod 1100 are axially slidingly matched.

[0064] The first screw rod 11 is threadedly connected to the first driving disk 1, and the threads of the two first driving disks 1 are arranged in opposite directions. Correspondingly, the first screw rod 11 has two thread sections with opposite directions. The first driving structure is used to drive the first screw rod 11 to rotate, and the guide rod 1100 is fixedly connected to the fixed shaft 110. Specifically, the first driving structure includes a first hydraulic cylinder (not shown in the figure), a first rack 112 and a second gear 111, wherein the second gear 111 is coaxially fixed to the end of the first screw rod 11, the first hydraulic cylinder is installed at the bottom of the machine base 10, the first rack 112 is fixed on the piston rod of the first hydraulic cylinder, the first rack 112 is perpendicular to the first screw rod 11, and the first rack 112 is meshed with the second gear 111. The first hydraulic cylinder is extended and retracted to drive the first screw rod 11 to rotate in the forward or reverse direction, thereby controlling the two first driving disks 1 to move closer to or away from each other.

[0065] Two first fixing rings 113 are coaxially fixed to the inner wall of the rotating sleeve 120 . The first fixing ring 113 is located in the axial gap between the two first driving disks 1 . A second conical surface 115 is provided at the inner diameter of the first fixing ring 113 .

[0066] The implementation principle of Example 1 is as follows: by setting a swing angle drive mechanism, an X-axis moving component and a Z-axis moving component 55, the workbench 56 can realize workpiece position control, and the traditional interpolation grinding method can be omitted when grinding the conical surface of the sealing pair. The swing angle drive mechanism drives the rotating seat 101, the Z-axis moving component 55, the grinding head slide 54, the dynamic and static pressure grinding head electronic axis 103 and the grinding wheel 104 to rotate and position as a whole according to the taper requirements of the workpiece. Only one coordinate of the Z-axis needs to be moved to complete the follow-up grinding of the conical surface, avoiding the grinding error caused by the difference in dynamic response characteristics of each coordinate axis and the difference in motion accuracy in the traditional interpolation grinding method, and obtaining higher grinding shape accuracy and grinding surface quality, so that the ideal smoothness of the grinding surface of the sealing pair reaches below Ra0.2, and the grinding inner and outer roundness reaches 0.003mm.

[0067] Secondly, the grinding wheel 104 always moves on the grinding sealing surface of the workpiece during the grinding process, which fully utilizes the processing time, improves the grinding efficiency, makes the grinding force uniform, improves the grinding accuracy, and can also ensure the compatibility and sealing of the three-eccentric butterfly valve sealing pair, achieving 100% interchangeability of the sealing pair.

[0068] Secondly, through the cooperation between the arc-shaped rack 105 and the first gear 106, the gear cooperation accuracy is higher than that of the worm gear, which can greatly improve the swing angle adjustment accuracy and grinding accuracy of the grinding wheel 104. Secondly, when the swing angle is adjusted, by starting the first driving structure, the first driving disk 1 is driven to approach each other to clamp the first fixed ring 113 (the first conical surface 114 and the second conical surface 115 cooperate and the first rubber layer 116 has great friction resistance), thereby realizing the fixed connection between the fixed shaft 110 and the rotating sleeve 120 to lock the rotating sleeve 120, thereby coping with the impact load of the rotating seat 101, thereby reducing the wear caused by the impact load on the arc-shaped rack 105 and the first gear 106, and then ensuring the stability of the cooperation accuracy.

[0069] Furthermore, the first tapered surface 114 and the second tapered surface 115 cooperate to improve the coaxiality between the fixed shaft 110 and the rotary sleeve 120 , thereby improving the rotation accuracy of the rotary sleeve 120 .

[0070] Example 2

[0071] The difference between Example 2 and Example 1 is that Figure 5 , Figure 6 As shown, the first screw rod 11 is eccentrically arranged with the rotating sleeve 120 , and a rotating ring 117 is fixed to the surface of the first driving disk 1 away from the other first driving disk 1 . The rotating ring 117 is coaxially arranged with the first driving disk 1 , and the outer circumference of the rotating ring 117 is in contact with the inner circumference of the rotating sleeve 120 .

[0072] When the first driving structure drives the first screw rod 11 to rotate, the two first driving disks 1 are driven to move toward each other through the threaded connection, thereby clamping the first fixed ring 113, and the outer circumference of the rotating ring 117 and the inner circumference of the rotating sleeve 120 are fitted together to limit the eccentric rotation of the first driving disk 1 driven by the friction force of the first screw rod 11, thereby ensuring that the first screw rod 11 can stably drive the first driving disk 1 to move axially.

[0073] Example 3

[0074] The difference between Example 3 and Example 1 is that Figure 7 , Figure 8 As shown, the high-precision grinding device for the sealing pair of a triple eccentric butterfly valve further includes a second locking mechanism, which includes a second driving assembly and two second driving disks 2, the second driving disks 2 are coaxially arranged with the rotary sleeve 120, the two second driving disks 2 are respectively located on the upper side and the lower side of the first driving disk 1, and a third conical surface 20 is provided at the outer edge of the second driving disk 2, and the third conical surface 20 is covered and fixed with a second rubber layer 201.

[0075] The second drive assembly is used to drive the two second drive disks 2 to move away from each other. Specifically, the second drive assembly includes a second screw rod 21 and a second drive structure. The end of the second screw rod 21 is rotatably connected to the fixed shaft 110. The first screw rod 11 and the second screw rod 21 are both parallel to the axis of the rotating sleeve 120. The first screw rod 11 and the second screw rod 21 are both eccentrically arranged with respect to the rotating sleeve 120. In this embodiment, the first screw rod 11 and the second screw rod 21 are symmetrically arranged with the axis of the rotating sleeve 120 as the center.

[0076] The second screw rod 21 is threadedly connected to the second driving disk 2, and the threads of the two second driving disks 2 are arranged in opposite directions. Correspondingly, the second screw rod 21 has two thread segments with opposite thread directions. The second driving structure is used to drive the second screw rod 21 to rotate. Specifically, the second driving structure includes a second hydraulic cylinder (not shown in the figure), a second rack 212 and a third gear 211, wherein the third gear 211 is coaxially fixed to the end of the second screw rod 21, the second hydraulic cylinder is installed at the bottom of the machine base 10, the second rack 212 is fixed on the piston rod of the second hydraulic cylinder, the second rack 212 is perpendicular to the second screw rod 21, and the second rack 212 is meshed with the third gear 211. The second hydraulic cylinder is extended and retracted to drive the second screw rod 21 to rotate in the forward or reverse direction, thereby controlling the two second driving disks 2 to move closer to or away from each other.

[0077] In addition, the first driving disk 1 is penetrated by a first guide hole 15, the outer peripheral surface of the second screw rod 21 has a second matching portion (not marked in the figure) that fits against the inner wall of the first guide hole 15, and the second driving disk 2 is penetrated by a second guide hole 23, and the outer peripheral surface of the first screw rod 11 has a first matching portion (not marked in the figure) that fits against the inner wall of the second guide hole 23.

[0078] Two second fixing rings 22 are coaxially fixed on the inner wall of the rotating sleeve 120 . The two second fixing rings 22 are respectively located on the upper and lower sides of the first fixing ring 113 . A fourth conical surface 221 is provided at the inner diameter of the second fixing ring 22 . The fourth conical surface 221 is used to cooperate with the third conical surface 20 .

[0079] Firstly, by providing the first locking mechanism and the second locking mechanism, the first drive disk 1 and the second drive disk 2 are matched with the first fixing ring 113 and the second fixing ring 22 respectively, and the matching area is large, thereby greatly improving the braking effect on the rotating sleeve 120.

[0080] Furthermore, by providing the first matching portion, the first guide hole 15, the second matching portion and the second guide hole 23, the second screw rod 21 can stop the first driving disk 1 from rotating, and the first screw rod 11 can stop the second driving disk 2 from rotating, thereby ensuring that the first driving disk 1 and the second driving disk 2 can move axially stably.

[0081] Secondly, the first drive disk 1 and the second drive disk 2 can also provide radial support for the first screw rod 11 and the second screw rod 21, thereby greatly improving the rigidity of the first screw rod 11 and the second screw rod 21, thereby improving the ability to resist impact loads.

[0082] Example 4

[0083] The difference between Example 4 and Example 3 is that Fig. 9 As shown, a ring groove 1210 is coaxially provided on the surface of the end cover 121, and one end of the first screw rod 11 and the second screw rod 21 away from the fixed shaft 110 is located in the ring groove 1210, that is, when the rotating sleeve 120 rotates, the first screw rod 11 and the second screw rod 21 can rotate around the axis of the rotating sleeve 120 in the ring groove 1210.

[0084] The ends of the first screw rod 11 and the second screw rod 21 away from the fixed shaft 110 are commonly connected with a connecting plate 1211 , and the two ends of the connecting plate 1211 are respectively passed through by the first screw rod 11 and the second screw rod 21 for rotational connection.

[0085] In this way, by setting the annular groove 1210 and the connecting plate 1211, the free ends of the first screw rod 11 and the second screw rod 21 can be limited in multiple directions (the free ends of the first screw rod 11 and the second screw rod 21 are the ends away from the fixed shaft 110) to improve the position stability of the first screw rod 11 and the second screw rod 21, thereby improving the braking effect on the rotating sleeve 120.

[0086] Example 5

[0087] The difference between Example 5 and Example 3 is that Fig.10 , Fig.11 , Fig.12 As shown, a center rod 1212 is coaxially fixed in the rotating sleeve 120 , and a through hole 24 for the center rod 1212 to pass through is penetrated at the center of the first driving disk 1 and the second driving disk 2 , and the diameter of the through hole 24 is larger than the diameter of the center rod 1212 .

[0088] The outer circumference of the center rod 1212 is fixed with a plurality of ring pieces 241 which are arranged one by one corresponding to the first drive disk 1 and the second drive disk 2. The outer edges of the ring pieces 241 abut against the outer circumferences of the first screw rod 11 and the second screw rod 21. The outer edges of the ring pieces 241 are integrally formed with inclined spring pieces 242. The spring pieces 242 are evenly arranged around the circumference. A guide ring 243 is coaxially fixed to the opening of the through hole 24. That is, the first drive disk 1 and the second drive disk 2 are both fixed with the guide ring 243. The inner diameter of the guide ring 243 abuts against the inclined surface of the spring piece 242.

[0089] When the first driving disk 1 and the second driving disk 2 retreat, the spring piece 242 is elastically compressed and deformed, and the elastic force of the spring piece 242 is applied to the first driving disk 1 and the second driving disk 2 through the guide ring 243, so that the first driving disk 1 and the second driving disk 2 maintain a coaxial state with the rotating sleeve 120.

[0090] Furthermore, when the first drive disk 1 and the second drive disk 2 move forward (the first drive disk 1 and the second drive disk 2 move toward the first fixing ring 113 and the second fixing ring 22 respectively), the elastic force of the spring piece 242 will be applied to the first drive disk 1 and the second drive disk 2 through the guide ring 243 to improve the tightness of the fit between the first conical surface 114 and the second conical surface 115 and to improve the tightness of the fit between the third conical surface 20 and the fourth conical surface 221, thereby reducing the axial movement of the first drive disk 1 and the second drive disk 2 caused by the thread fit clearance.

[0091] Example 6

[0092] The difference between Example 6 and Example 3 is that Fig.13 , Fig.14 , Fig.15 As shown ( Fig.13 , Fig.14 and Fig.15 The two dotted arrows in the figure are the moving directions of the first driving disk 1 and the second driving disk 2, and the two solid arrows are the directions of the forces f1 and f2, respectively. The first conical surface 114 is fixed with a circle of serrated first meshing teeth 31, the second conical surface 115 is fixed with a circle of serrated second meshing teeth 32, the third conical surface 20 is fixed with a circle of serrated third meshing teeth 33, and the fourth conical surface 221 is fixed with a circle of serrated fourth meshing teeth 34.

[0093] The tip of the second meshing tooth 32 of the first fixing ring 113 and the tip of the fourth meshing tooth 34 of the second fixing ring 22 are located in the same radial plane, and the tip of the first meshing tooth 31 of the first driving disk 1 and the recess of the third meshing tooth 33 of the second driving disk 2 are located in the same radial plane.

[0094] When the two first meshing teeth 31 approach each other to contact the second meshing teeth 32, and the two third meshing teeth 33 move away from each other to contact the fourth meshing teeth 34, one of the inclined surfaces of the two first meshing teeth 31 is simultaneously in contact with the corresponding inclined surfaces of the two second meshing teeth 32 (the axial movement strokes of the two first meshing teeth 31 are consistent), and the circumferential component of force received by the corresponding inclined surface is set to f2; one of the inclined surfaces of the two third meshing teeth 33 is simultaneously in contact with the corresponding inclined surfaces of the two fourth meshing teeth 34 (the axial movement strokes of the two third meshing teeth 33 are consistent), and the circumferential component of force received by the corresponding inclined surface is set to f1. Since the inclination direction of the corresponding inclined surface of the fourth meshing tooth 34 is opposite to that of the corresponding inclined surface of the second meshing tooth 32, the direction of f1 is opposite to that of f2, and f1 and f2 abut against each other, that is, the first meshing teeth 31 and the third meshing teeth 33 circumferentially limit the rotating sleeve 120, thereby greatly improving the locking and braking effect of the rotating sleeve 120.

[0095] Example 7

[0096] The difference between Example 7 and Example 6 is that Fig.16 , Fig.17 As shown, the second meshing tooth 32 includes a first half tooth 321 and a second half tooth 322 which are separately arranged. The first half tooth 321 and the second half tooth 322 are integrally connected to the second conical surface 115 through the first tooth root 323. There is a gap between the first half tooth 321 and the second half tooth 322 and the second conical surface 115 respectively, and there is a gap between the first half tooth 321 and the second half tooth 322.

[0097] The fourth meshing tooth 34 includes a third half tooth 341 and a fourth half tooth 342 which are separately arranged. The third half tooth 341 and the fourth half tooth 342 are integrally connected to the fourth conical surface 221 through the second tooth root 343. There is a gap between the third half tooth 341 and the fourth half tooth 342 and the fourth conical surface 221 respectively, and there is a gap between the third half tooth 341 and the fourth half tooth 342.

[0098] By separately setting the second meshing teeth 32 and the fourth meshing teeth 34, the second meshing teeth 32 and the fourth meshing teeth 34 have elastic deformation capabilities. When subjected to the circumferential force of the first meshing teeth 31 and the third meshing teeth 33, the second meshing teeth 32 and the fourth meshing teeth 34 will undergo adaptive elastic deformation, thereby making the fitting and biting effect stronger.

[0099] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A high-precision grinding device for a triple-eccentric butterfly valve sealing pair, characterized in that: The invention comprises a machine body (51), a machine base (10), a rotating base (101), a crossbeam (52), a grinding head slide seat (54), a workbench (56) for clamping a sealing pair of a three-eccentric butterfly valve, a dynamic and static pressure grinding head electronic axis (103), an X-axis moving assembly, a Z-axis moving assembly (55), a swing angle driving mechanism and a first locking mechanism, wherein the crossbeam (52) is arranged on the machine body (51), the machine base (10) is fixed with a transverse slide seat (53), the transverse slide seat (53) and the crossbeam (52) are horizontally slidably matched, the X-axis moving assembly is used to drive the transverse slide seat (53) to move, and the machine base (10) is fixed with a horizontal device The rotating seat (101) is provided with a rotating sleeve (120), and the rotating sleeve (120) is coaxially rotatably connected with the fixed shaft (110); the swing angle driving mechanism is used to drive the rotating seat (101) to rotate relative to the machine base (10); the grinding head slide seat (54) is slidably matched with the rotating seat (101), and the Z-axis moving component (55) is used to drive the grinding head slide seat (54) to move, and the grinding head slide seat (54) is provided with the dynamic and static pressure grinding head electronic axis (103), and the end of the dynamic and static pressure grinding head electronic axis (103) is provided with a grinding wheel (104); the workbench (56) is installed on The machine body (51) is located below the electronic axis (103) of the dynamic and static pressure grinding head; the swing angle driving mechanism comprises a driving motor (107), a first gear (106) and an arc-shaped rack (105), wherein the driving motor (107) is installed on the machine base (10), the first gear (106) is installed on the output shaft of the driving motor (107), the arc-shaped rack (105) is fixed to the rotating base (101), and the curvature center of the arc-shaped rack (105) is located on the axis of the rotating sleeve (120), the arc-shaped rack (105) is meshed with the first gear (106), and the first locking mechanism includes The invention comprises a first drive assembly and two first drive disks (1), wherein the fixed shaft (110) is provided with the first drive disk (1), the first drive disk (1) is coaxially arranged with the rotating sleeve (120), a first conical surface (114) is provided at the outer edge of the first drive disk (1), two first fixed rings (113) are coaxially fixed on the inner wall of the rotating sleeve (120), a second conical surface (115) is provided at the inner diameter of the first fixed ring (113), and the first drive assembly is used to drive the two first drive disks (1) to move closer to each other until the first conical surface (114) matches with the second conical surface (115).

2. The high-precision grinding equipment for triple-eccentric butterfly valve sealing pair according to claim 1 is characterized in that: The first drive assembly comprises a first screw rod (11), a first drive structure and a guide rod (1100), wherein the first screw rod (11) is coaxially arranged with the rotating sleeve (120), the first screw rod (11) is threadedly connected with the first drive disk (1), the threads of the two first drive disks (1) are arranged in opposite directions, the first drive structure is used to drive the first screw rod (11) to rotate, the guide rod (1100) is fixedly connected with the fixed shaft (110), and the guide rod (1100) slides through the first drive disk (1).

3. The high-precision grinding equipment for triple-eccentric butterfly valve sealing pair according to claim 1 is characterized in that: The first drive assembly comprises a first screw rod (11), a first driving structure and a rotating ring (117); the rotating ring (117) is coaxially fixed with the first drive disk (1); the outer circumference of the rotating ring (117) is in contact with the inner circumference of the rotating sleeve (120); the first screw rod (11) and the rotating sleeve (120) are eccentrically arranged; the first screw rod (11) is threadedly connected to the first drive disk (1); the threads of the two first drive disks (1) are arranged in opposite directions; and the first driving structure is used to drive the first screw rod (11) to rotate.

4. The high-precision grinding equipment for triple-eccentric butterfly valve sealing pair according to claim 1 is characterized in that: The invention also comprises a second locking mechanism, wherein the second locking mechanism comprises a second driving assembly and two second driving disks (2), the fixed shaft (110) is provided with the second driving disk (2), the second driving disk (2) is coaxially arranged with the rotating sleeve (120), the two second driving disks (2) are respectively located on the upper side and the lower side of the first driving disk (1), a third conical surface (20) is provided at the outer edge of the second driving disk (2), two second fixing rings (22) are coaxially fixed on the inner wall of the rotating sleeve (120), the two second fixing rings (22) are respectively located on the upper side and the lower side of the first fixing ring (113), a fourth conical surface (221) is provided at the inner diameter of the second fixing ring (22), and the second driving assembly is used to drive the two second driving disks (2) to move away from each other until the third conical surface (20) matches with the fourth conical surface (221); the first driving assembly comprises a first screw rod (11) and a first driving structure, and the second driving assembly comprises a second screw rod (21) and a second driving structure The invention relates to a structure in which the first screw rod (11) and the second screw rod (21) are parallel to the axis of the rotary sleeve (120), the first screw rod (11) and the second screw rod (21) are eccentrically arranged with respect to the rotary sleeve (120), the first screw rod (11) is threadedly connected to the first driving disk (1), the threads of the two first driving disks (1) are arranged in opposite directions, the first driving structure is used to drive the first screw rod (11) to rotate, the second screw rod (21) is threadedly connected to the second driving disk (2), the threads of the two second driving disks (2) are arranged in opposite directions, and the second driving structure is used to drive the second screw rod (21) to rotate; the first driving disk (1) is penetrated by a first guide hole (15), the outer peripheral surface of the second screw rod (21) has a second matching portion that fits the inner wall of the first guide hole (15), the second driving disk (2) is penetrated by a second guide hole (23), and the outer peripheral surface of the first screw rod (11) has a first matching portion that fits the inner wall of the second guide hole (23).

5. The high-precision grinding equipment for triple-eccentric butterfly valve sealing pair according to claim 4 is characterized in that: The first conical surface (114) is provided with a circle of sawtooth-shaped first meshing teeth (31), the second conical surface (115) is provided with a circle of sawtooth-shaped second meshing teeth (32), the third conical surface (20) is provided with a circle of sawtooth-shaped third meshing teeth (33), and the fourth conical surface (221) is provided with a circle of sawtooth-shaped fourth meshing teeth (34); the tip of the second meshing teeth (32) of the first fixing ring (113) and the tip of the fourth meshing teeth (34) of the second fixing ring (22) are located on the same diameter. Inwardly, the tip of the first meshing tooth (31) of the first drive disk (1) and the recess of the third meshing tooth (33) of the second drive disk (2) are located in the same radial plane, the moving distances of the two first drive disks (1) are consistent, the moving distances of the two second drive disks (2) are consistent, the inclined surface of the second meshing tooth (32) is used to be fitted with the inclined surface of the first meshing tooth (31), and the inclined surface of the fourth meshing tooth (34) is used to be fitted with the inclined surface of the third meshing tooth (33).

6. The high-precision grinding equipment for triple-eccentric butterfly valve sealing pair according to claim 5, characterized in that: The second meshing tooth (32) comprises a first half tooth (321) and a second half tooth (322) which are separately arranged, and the first half tooth (321) and the second half tooth (322) are integrally connected to the second conical surface (115) through a first tooth root (323), and there is a gap between the first half tooth (321) and the second half tooth (322) and the second conical surface (115), and there is a gap between the first half tooth (321) and the second half tooth (322); the fourth meshing tooth (34) comprises a third half tooth (341) and a fourth half tooth (342) which are separately arranged, and the third half tooth (341) and the fourth half tooth (342) are integrally connected to the fourth conical surface (221) through a second tooth root (343), and there is a gap between the third half tooth (341) and the fourth half tooth (342) and the fourth conical surface (221), and there is a gap between the third half tooth (341) and the fourth half tooth (342).

7. The high-precision grinding equipment for triple-eccentric butterfly valve sealing pair according to claim 4, characterized in that: An end cover (121) is fixed to one end of the rotary sleeve (120), and a ring groove (1210) is coaxially provided on the surface of the end cover (121); one end of the first screw rod (11) and the second screw rod (21) are rotatably connected to the fixed shaft (110), and the other end of the first screw rod (11) and the second screw rod (21) are located in the ring groove (1210); the ends of the first screw rod (11) and the second screw rod (21) away from the fixed shaft (110) are commonly connected to a connecting plate (1211), and the two ends of the connecting plate (1211) are respectively provided for the first screw rod (11) and the second screw rod (21) to pass through and be rotatably connected.

8. The high-precision grinding equipment for triple-eccentric butterfly valve sealing pair according to claim 4 or 7, characterized in that: A center rod (1212) is coaxially fixed inside the rotating sleeve (120); a through hole (24) for the center rod (1212) to pass through is penetrated at the center of the first drive disk (1) and the second drive disk (2); a plurality of ring plates (241) corresponding to the first drive disk (1) and the second drive disk (2) are fixed on the outer peripheral surface of the center rod (1212); the outer edges of the ring plates (241) are in contact with the first screw rod (11) and the second drive disk (2). On the outer peripheral surface of the second screw rod (21), an outer edge of the ring sheet (241) is integrally formed with an inclined spring sheet (242), and the spring sheets (242) are evenly arranged around the circumference. A guide ring (243) is coaxially fixed to the opening of the through hole (24), and the inner diameter of the guide ring (243) abuts against the inclined surface of the spring sheet (242); when the first drive disk (1) and the second drive disk (2) retreat, the spring sheet (242) is elastically compressed and deformed.

9. The high-precision grinding equipment for triple-eccentric butterfly valve sealing pair according to claim 4, characterized in that: A first rubber layer (116) is provided at the matching position between the first conical surface (114) and the second conical surface (115), and a second rubber layer (201) is provided at the matching position between the third conical surface (20) and the fourth conical surface (221).

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