Vent valve seat milling device

Abstract

The present application relates to a kind of ventilation valve seat milling device, it is related to valve seat milling technical field, including milling machine body, milling machine body is equipped with multi-axis robot, multi-axis robot is equipped with milling cutter, milling machine body is provided with valve seat workpiece, milling machine body is provided with milling assembly, milling assembly includes base, base is fixedly connected on milling machine body, inner cavity is opened in base, the top of base is annular array and is equipped with four guide slots;Through the operation of milling assembly, valve seat workpiece is rotated in real time during milling process, so that clamping position and the dynamic stagger of region to be processed, after rotating transposition, can be processed to original clamping area, realize complete milling machining without blind area, and valve seat workpiece full circle, full position non-interference milling machining, without completely disassembling and repositioning, eliminate the cumulative error caused by multiple clamping in prior art, so that the milling machining precision of valve seat workpiece is higher.

Description

Technical Field

[0001] This invention relates to the field of valve seat milling technology, specifically to a valve seat milling device for ventilation valves. Background Technology

[0002] Existing ventilation valve seats are usually machined using a milling machine. The valve seat blank is cut by milling to produce key structures such as sealing surface, mounting surface, positioning groove, inner hole and outer circle that meet the design requirements, thereby ensuring the fitting accuracy, sealing performance and assembly reliability between the valve seat and the valve plate.

[0003] However, when machining different types of valve seats, traditional milling machines require extensive adjustments to tooling and machining programs when changing products, making it difficult to adapt to the curved surface machining characteristics of valve seats of different specifications. At the same time, the clamping fixtures equipped on existing milling machines mostly adopt conventional internal and external circular clamping structures. The clamping parts are prone to overlap with the sealing surface, end face, and other machining areas of the valve seat to be milled, resulting in milling interference. This causes the overlapping parts to be unable to be completely machined, or the workpiece to be disassembled and aligned multiple times, ultimately affecting the machining accuracy and production efficiency of the valve seat. Summary of the Invention

[0004] A ventilation valve seat milling device includes a milling machine body, a multi-axis robotic arm mounted on the milling machine body, a milling cutter mounted on the multi-axis robotic arm, a valve seat workpiece disposed on the milling machine body, and a milling assembly disposed on the milling machine body. The milling assembly includes a base, which is fixedly connected to the milling machine body. An inner cavity is formed inside the base. Four guide grooves are formed in a circular array on the top of the base. The guide grooves are connected to the inner cavity. A clamping plate is slidably connected in each guide groove. A rubber pad is fixedly connected to the side of each clamping plate facing the center of the base. Four pressure plates are provided on the top surface of the base. Two through grooves are symmetrically formed on each clamping plate and the rubber pad. Two rollers are provided on each clamping plate. The milling assembly also includes four sealing strips, which are fixedly connected to four guide grooves respectively. The sealing strips are fixedly connected to the corresponding clamping plates. A servo motor is fixedly connected to the bottom of the groove wall of the inner cavity. The servo motor includes a fixed end and an output shaft. The output shaft end of the servo motor faces upward. A turntable is fixedly connected to the output shaft end of the servo motor. Four connecting rods are rotatably connected in a circular array on the turntable. The ends of the four connecting rods away from the turntable are rotatably connected to the bottom ends of the four clamping plates respectively. Each of the four clamping plates has a sliding groove. A sliding rod is slidably connected in each sliding groove. The four pressure plates are fixedly connected to the top ends of the four sliding rods respectively. Each slide rod has a sliding frame slidably connected to its bottom end. The four slide frames are fixedly connected to a connecting frame at the end closest to servo motor one. Servo motor two is fixedly connected to the bottom of the inner cavity groove wall. Servo motor two includes a fixed end and an output shaft. The output shaft end of servo motor two faces upward. A threaded rod is fixedly connected to the output shaft end of servo motor two. Each clamping plate has a guide rod fixedly connected to its side away from the rubber pad. A connecting plate is slidably connected to each guide rod. A tension spring is fitted on each guide rod. Both ends of the connecting plate extend into the adjacent through groove. A servo motor three is fixedly connected to both ends of each connecting plate. Servo motor three includes a fixed end and an output shaft. The output shaft end of servo motor three faces downward. Each roller is fixedly connected to the corresponding output shaft end of servo motor three.

[0005] Furthermore, the sealing strip is designed as a stacked pleated shape, and the sealing strip is made of rubber.

[0006] Furthermore, the side of the rubber pad away from the clamping plate is set as a frosted anti-slip surface. The rubber pad is pressed against the outer wall of the valve seat workpiece, the roller is pressed against the outer wall of the valve seat workpiece, the pressure plate is pressed against the top surface of the valve seat workpiece, and the lower surface of the pressure plate is set as a frosted rubber anti-slip surface.

[0007] Furthermore, the milling machine body has a built-in control system, and the multi-axis robotic arm, servo motor one, servo motor two, and servo motor three are all electrically connected to the control system of the milling machine body.

[0008] Furthermore, the end of each sliding frame furthest from the connecting frame is slidably connected to the side wall of the inner cavity, and the threaded rod is threadedly connected to the connecting frame.

[0009] Furthermore, the two ends of the tension spring are fixedly connected to the guide rod and the connecting plate, respectively.

[0010] Compared with the prior art, the beneficial effects of the present invention are: Firstly: In existing technologies, the clamping area of ​​traditional grippers overlaps with the machining area of ​​the valve seat workpiece, making complete milling impossible and requiring repeated clamping and adjustment.

[0011] By operating the milling component, the valve seat workpiece is rotated in real time during the milling process, so that the clamping position is dynamically offset from the area to be processed. After rotation and repositioning, the original clamping area can be supplemented for processing, realizing complete milling without blind spots, as well as interference-free milling of the valve seat workpiece in all circumference and all positions. It eliminates the need for complete disassembly and repeated positioning, thus eliminating the cumulative error caused by multiple clamping in the existing technology, thereby making the milling accuracy of the valve seat workpiece higher.

[0012] Secondly: In the existing technology, when processing different types of valve seats, changing products requires a lot of adjustments to the tooling and processing procedures, making it difficult to adapt to the curved surface processing characteristics of valve seat workpieces of different specifications.

[0013] By operating the milling assembly, it can be adapted to valve seat workpieces of different diameters and models. When processing valve seat workpieces of different specifications, there is no need to change tooling a lot, which greatly reduces the workload of tooling adjustment and program debugging, realizes multi-purpose use of one machine, and improves the versatility of valve seat workpiece milling production line. Attached Figure Description

[0014] Figure 1 This is a three-dimensional schematic diagram of the overall device of the present invention; Figure 2 This is a schematic diagram showing the positions of the milling cutter, valve seat, and other structures of the present invention; Figure 3 This is a schematic diagram showing the positions of the base, valve seat, and other structures of the present invention; Figure 4 This is a cross-sectional schematic diagram of the base, servo motor, and other structures of the present invention; Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle; Figure 6 This is a cross-sectional schematic diagram of the through groove, roller, and other structures of the present invention; Figure 7 This is a schematic diagram showing the positions of the turntable, connecting rod, and other structures of the present invention; Figure 8 This is a cross-sectional schematic diagram of the base, inner cavity, and other structures of the present invention; Figure 9 This is a schematic diagram showing the positions of the connecting rod, sliding frame, and other structures of the present invention; Figure 10 This is an exploded view of the structure of the clamping plate, rubber pad, etc. of the present invention; Figure 11 This is a schematic diagram showing the positions of the guide rod, connecting plate, and other structures of the present invention.

[0015] In the picture: 11. Milling machine body; 12. Multi-axis robotic arm; 13. Milling cutter; 14. Valve seat workpiece; 21. Base; 22. Inner cavity; 23. Guide groove; 24. Clamping plate; 25. Sealing strip; 26. Rubber pad; 27. Servo motor one; 28. Turntable; 29. ​​Connecting rod; 210. Slide groove; 211. Slide rod; 212. Pressure plate; 213. Slide frame; 214. Connecting frame; 215. Servo motor two; 216. Threaded rod; 217. Through groove; 218. Guide rod; 219. Connecting plate; 220. Tension spring; 221. Servo motor three; 222. Roller. Detailed Implementation

[0016] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0017] Reference Figures 1 to 11 As shown, a ventilation valve seat milling device includes a milling machine body 11, a multi-axis robotic arm 12 mounted on the milling machine body 11, a milling cutter 13 mounted on the multi-axis robotic arm 12, and a valve seat workpiece 14 disposed on the milling machine body 11.

[0018] Among them, the milling machine body 11, the multi-axis robotic arm 12, and the milling cutter 13 are used to mill the valve seat workpiece 14. The milling machine body 11, the multi-axis robotic arm 12, and the milling cutter 13 are all existing known technologies, and will not be described in detail here.

[0019] A milling assembly is provided on the milling machine body 11. The milling assembly includes a base 21, which is fixedly connected to the milling machine body 11. An inner cavity 22 is formed inside the base 21. Four guide grooves 23 are arranged in a circular array on the top of the base 21. A clamping plate 24 is slidably connected in each guide groove 23. A sealing strip 25 is fixedly connected in each guide groove 23. A rubber pad 26 is fixedly connected to the side of each clamping plate 24 facing the center of the base 21. A servo motor 27 is fixedly connected to the bottom of the groove wall of the inner cavity 22. The servo motor 27 includes a fixed end and an output shaft. The output shaft end of the servo motor 27 faces upward, and a turntable 28 is fixedly connected to the output shaft end of the servo motor 27. Four connecting rods 29 are rotatably connected in a circular array on the turntable 28. The ends of the four connecting rods 29 away from the turntable 28 are rotatably connected to the bottom ends of four clamping plates 24 respectively. Each of the four clamping plates 24 has a sliding groove 210, and a sliding rod 211 is slidably connected in each sliding groove 210. A pressure plate 212 is fixedly connected to the top end of each sliding rod 211. Each of the four slide frames 213 is slidably connected to the bottom of the servo motor 27. A connecting frame 214 is fixedly connected to the end of each of the four slide frames 213 closest to the servo motor 27. A servo motor 215 is fixedly connected to the bottom of the groove wall of the inner cavity 22. The servo motor 215 includes a fixed end and an output shaft. The output shaft end of the servo motor 215 faces upwards, and a threaded rod 216 is fixedly connected to the output shaft end of the servo motor 215. Two through slots 217 are symmetrically opened on each clamping plate 24 and the rubber pad 26. Each clamping plate 24 is away from the rubber pad 27. A guide rod 218 is fixedly connected to one side of 6. A connecting plate 219 is slidably connected to each guide rod 218. A tension spring 220 is sleeved on each guide rod 218. Both ends of the connecting plate 219 extend into the adjacent through groove 217. A servo motor 221 is fixedly connected to both ends of each connecting plate 219. The servo motor 221 includes a fixed end and an output shaft. The output shaft end of the servo motor 221 faces downward. A roller 222 is fixedly connected to the output shaft end of each servo motor 221.

[0020] Among them, the guide groove 23 is connected to the interior of the inner cavity 22.

[0021] Wherein: the sealing strip 25 is fixedly connected to the clamping plate 24. The sealing strip 25 is set in a stacked pleated shape and is made of rubber. The function of the sealing strip 25 is to provide shielding protection for the internal structure of the inner cavity 22, thereby preventing the debris from entering the inner cavity 22 during the milling of the valve seat workpiece 14. Furthermore, through the stacked pleated shape design and the elastic properties of the rubber material, the sealing strip 25 will not affect the normal sliding of the clamping plate 24 in the guide groove 23.

[0022] Among them, the side of the rubber pad 26 away from the clamping plate 24 is set as a sanded anti-slip surface, and the rubber pad 26 is pressed and fitted with the outer wall of the valve seat workpiece 14.

[0023] Among them, the milling machine body 11 has a built-in control system, and the multi-axis robotic arm 12, servo motor 1 27, servo motor 215, and servo motor 3 221 are all electrically connected to the control system of the milling machine body 11.

[0024] Wherein: the end of each sliding frame 213 away from the connecting frame 214 is slidably connected to the side wall of the inner cavity 22.

[0025] Specifically, threaded rod 216 is threadedly connected to connecting frame 214. It should be noted that threaded rod 216 is positioned so as not to interfere with the rotation of connecting rod 29.

[0026] Wherein: the two ends of the tension spring 220 are fixedly connected to the guide rod 218 and the connecting plate 219 respectively.

[0027] Wherein: roller 222 is pressed into the outer wall of valve seat workpiece 14, pressure plate 212 is pressed into the top surface of valve seat workpiece 14, and the lower surface of pressure plate 212 is set as a rubber anti-slip surface with a frosted finish.

[0028] It should be noted that the diameter of roller 222 is larger than the size of servo motor 3 221, specifically to ensure that servo motor 3 221 will not interfere with the squeezing and contact between roller 222 and valve seat workpiece 14.

[0029] Before milling the valve seat workpiece 14, the milling assembly is in its initial state, and the structural states within the milling assembly are as follows: The valve seat workpiece 14 has not yet been placed on the base 21. The clamping plate 24 is located in the corresponding guide groove 23 on the side away from the center of the base 21, that is, the distance between the four clamping plates 24 is at its maximum at this time. The slide rod 211 is located in the corresponding slide frame 213 on the side away from the connecting frame 214. The orientation of the four connecting rods 29 on the turntable 28 is parallel to the axial direction of the corresponding guide groove 23. The four slide rods 211 extend fully upward in the corresponding slide groove 210, that is, the pressure plate 212 is at its highest position at this time. At this time, the slide frame 213 is located at the top of the side wall of the inner cavity 22, the connecting frame 214 is located at the top of the threaded rod 216, the tension spring 220 does not produce elastic deformation, the connecting plate 219 and the clamping plate 24 are in contact and fit against the side away from the rubber pad 26, the roller 222 passes through the through groove 217 on the rubber pad 26, and the roller 222 is located on the side of the rubber pad 26 away from the clamping plate 24.

[0030] When it is necessary to mill the valve seat workpiece 14, the milling assembly operates as follows: The user places the valve seat workpiece 14 to be milled on the top surface of the base 21. Then, the user drives the servo motor 27 through the control system of the milling machine body 11. As the servo motor 27 operates, its output shaft drives the turntable 28 to rotate synchronously. During the rotation of the turntable 28, the four connecting rods 29 on the turntable 28 are also driven to rotate synchronously. As the connecting rods 29 rotate around the turntable 28, they push and pull the corresponding clamping plates 24. However, since the clamping plates 24 slide within the guide groove 23, they can only move linearly along the axial direction of the guide groove 23 and cannot rotate with the connecting rods 29. Therefore, as the connecting rods 29 rotate around the turntable 28, they can push and pull the clamping plates 24, allowing them to slide within the guide groove 23. Furthermore, the user can control the direction of the clamping plates 24 sliding within the guide groove 23 by controlling the rotation direction of the output shaft of the servo motor 27.

[0031] At this time, the user needs to control the clamping plate 24 to slide in the guide groove 23 toward the center of the base 21, that is, toward the valve seat workpiece 14. At this time, the four clamping plates 24 slide in the corresponding guide groove 23 toward the valve seat workpiece 14. Since the four guide grooves 23 and the four connecting rods 29 are arranged in a circumferential array at equal intervals, the movement stroke of each clamping plate 24 caused by the push and pull force of the corresponding connecting rod 29 is completely consistent, so that the four clamping plates 24 move together toward the center of the base 21 at equal intervals.

[0032] As the four clamping plates 24 move towards the center of the base 21 at equal intervals, the rollers 222 are located on the side of the rubber pad 26 near the center of the base 21. As a result, the multiple rollers 222, which are distributed in a ring, will first contact the outer side of the valve seat workpiece 14 and push the valve seat workpiece 14 towards the center of the base 21, so that the valve seat workpiece 14 is pushed and corrected on the base 21 to a position coaxial with the base 21.

[0033] As the output shaft of servo motor 27 continues to rotate, the four clamping plates 24 apply a centripetal pushing force to the valve seat workpiece 14, causing the clamping plates 24 to continue moving towards the center of the base 21. At this time, since the roller 222 has already abutted against the outer wall of the valve seat workpiece 14, the roller 222 cannot move synchronously with the clamping plates 24. This results in the roller 222 remaining in contact with the outer wall of the valve seat workpiece 14, while the clamping plates 24 move towards the valve seat workpiece 14. The connecting plate 219, being fixed to the roller 222 via servo motor 221, also remains in a state where it does not move synchronously with the clamping plates 24. As the clamping plates 24 move, the through grooves 217 on the clamping plates 24 and rubber pads 26 pass through the corresponding rollers 222, causing the rubber pads 26 to abut against the outer side of the valve seat workpiece 14. Simultaneously, the rubber pads 26 are compressed, resulting in elastic deformation. Under this elastic deformation, the rubber pads 26 adhere to the curved surface of the outer side of the valve seat workpiece 14. Under the action of the thrust and the friction of the anti-slip surface of the rubber pads 26, the four clamping plates 24, through the rubber pads 26, limit and fix the valve seat workpiece 14 to the top of the base 21. During the movement of the clamping plates 24 toward the valve seat workpiece 14, the connecting plate 219 does not move synchronously with the clamping plates 24, while the guide rod 218, being fixed to the clamping plates 24, moves synchronously. Consequently, the guide rod 218 slides on the connecting plate 219, causing the tension spring 220 to undergo elastic deformation, and the connecting plate 219 does not adhere to the clamping plates 24.

[0034] After the valve seat workpiece 14 is squeezed and limited by the four clamping plates 24 through the rubber pad 26, the user pauses the operation of the servo motor 27 to fix the valve seat workpiece 14 in its limited state. At this time, the rubber pad 26 and the roller 222 are in contact with and squeezed against the outer wall side of the valve seat workpiece 14.

[0035] It should be noted that as the four clamping plates 24 move inward, the clamping plates 24 drive the corresponding sliding rods 211 to move synchronously, so that the sliding rods 211 slide in the direction of the servo motor 27 within the corresponding sliding frame 213.

[0036] After completion, the user drives the second servo motor 215 through the control system of the milling machine body 11. The operation of the second servo motor 215 causes the output shaft to rotate. The output shaft of the second servo motor 215 drives the threaded rod 216 to rotate synchronously. During the rotation of the threaded rod 216, the threaded rod 216 tends to drive the connecting frame 214 connected to it to deflect along the thread direction. However, since the connecting frame 214 is limited to sliding by the slide frame 213 and the side of the groove wall of the inner cavity 22, the slide frame 213 and the connecting frame 214 can only move vertically within the inner cavity 22. Furthermore, the rotation of the threaded rod 216 can only drive the connecting frame 214 and the sliding frame 213 to move vertically up and down inside the inner cavity 22. At this time, the user drives the second servo motor 215 to make the connecting frame 214 and the sliding frame 213 move vertically down inside the inner cavity 22. As the connecting frame 214 and the sliding frame 213 move downward, the sliding frame 213 simultaneously drives the sliding rod 211 to move downward, thereby causing the sliding rod 211 to slide downward inside the sliding groove 210. Simultaneously, the sliding rod 211 drives the pressure plate 212 to move downward until the pressure plate 212 moves down until the rubber anti-slip surface of its lower surface abuts against the top of the squeeze valve seat workpiece 14. At this time, the user controls the second servo motor 215 to stop running, thereby fixing the state of the pressure plate 212 abutting against the squeeze valve seat workpiece 14.

[0037] At this time, the outer wall of the valve seat workpiece 14 is pressed against by four rubber pads 26 and four rollers 222, and the top surface of the valve seat workpiece 14 is pressed against by four pressure plates 212. Both the rubber pads 26 and the pressure plates 212 are provided with rubber anti-slip surfaces. Through elastic deformation, they can completely conform to the shape of the valve seat workpiece 14, and through friction, they can enhance the clamping force between them and the valve seat workpiece 14, thereby completely fixing and limiting the valve seat workpiece 14 to the top surface of the base 21. This prevents it from moving during the milling process.

[0038] It should be noted that users can control the inward clamping distance of the four clamping plates 24 and the downward movement distance of the four pressure plates 212 to achieve adaptive clamping of valve seat workpieces 14 of different specifications and sizes, thereby ensuring that the valve seat workpieces 14 to be milled of different specifications and sizes are universal.

[0039] At this point, the clamping of the valve seat workpiece 14 is completed. The user can drive the multi-axis robotic arm 12 to run through the control system of the milling machine body 11, thereby performing milling operations on the valve seat workpiece 14. The multi-axis robotic arm 12 can drive the milling cutter 13 to perform multi-angle and multi-directional movement processing, and perform flexible milling processing on the valve seat workpiece 14 that is fixed and limited.

[0040] During the milling process of the valve seat workpiece 14, when the multi-axis robotic arm 12 and the milling cutter 13 need to mill the position of the valve seat workpiece 14 that is covered by the rubber pads 26 and the pressure plate 212, the user can drive the servo motor 27 through the control system of the milling machine body 11 to run, so that the output shaft of the servo motor 27 rotates in the opposite direction, and slightly separates the four clamping plates 24. The purpose of slightly separating is to make the four rubber pads 26 no longer contact the valve seat workpiece 14. However, as the clamping plates 24 move away from the valve seat workpiece 14, under the elastic reset action of the tension spring 220, the tension spring 220 pushes the connecting plate 219, so that the roller 222 still contacts the outer wall of the valve seat workpiece 14. At this time, the user stops the operation of the servo motor 27 and fixes the state in which the rubber pads 26 do not contact the valve seat workpiece 14 but the roller 222 does contact the valve seat workpiece 14.

[0041] At the same time, the user drives the second servo motor 215 to run, causing the output shaft of the second servo motor 215 to rotate in the opposite direction, thereby causing the slide bar 211 to push the pressure plate 212 slightly upward, so that the pressure plate 212 no longer touches the top surface of the valve seat workpiece 14. At this time, the user stops the operation of the first servo motor 27. After completion, the user drives the servo motor 221 through the control system of the milling machine body 11, causing the output shaft of the servo motor 221 to drive the roller 222 to rotate. During the rotation of the roller 222, the valve seat workpiece 14 is still pressed against the outer wall by the multiple ring-shaped rollers 222. The rollers 222 can guide the rotation of the valve seat workpiece 14. That is, although the rubber pad 26 does not press against the valve seat workpiece 14 at this time, the valve seat workpiece 14 is still located in the center of the base 21 under the pressing action of the rollers 222. The rotation of the rollers 222 pushes the valve seat workpiece 14 to rotate on the top of the base 21 through friction. As the valve seat workpiece 14 rotates, the valve seat workpiece 14, which was previously covered by the rubber pad 26 and the pressure plate 212, is now rotated. The position of the cover rotates synchronously to switch positions. When the valve seat workpiece 14 rotates to the point where the previously covered position is fully exposed, the user stops the operation of the servo motor 221, so that the valve seat workpiece 14 is no longer rotated. The user then controls the operation of the servo motor 27 and the through groove 217 to move and reset the rubber pad 26 and the pressure plate 212 to clamp the valve seat workpiece 14 again. At this time, the position covered by the rubber pad 26 and the pressure plate 212 is the position where the valve seat workpiece 14 is milled. The position of the valve seat workpiece 14 that has not been milled is exposed with the rotation, which facilitates the milling machine body 11, the multi-axis robotic arm 12, and the milling cutter 13 to cooperate in milling. This allows for real-time adjustment of the clamping position of the valve seat workpiece 14 without unclamping it.

[0042] After the valve seat workpiece 14 is milled, the user drives the servo motor 27 and servo motor 215 through the control system of the milling machine body 11, so that the milling components return to the initial state, that is, the valve seat workpiece 14 is no longer clamped and limited. At this time, the user can remove the valve seat workpiece 14 from the base 21.

[0043] In summary, the following beneficial effects can be achieved by operating the milling assembly: Firstly: In the existing technology, the clamping area of ​​the traditional gripper overlaps with the machining part of the valve seat workpiece 14, which makes it impossible to mill completely and requires repeated clamping and adjustment.

[0044] By operating the milling assembly, the valve seat workpiece 14 is rotated in real time during the milling process, so that the clamping position is dynamically offset from the area to be processed. After rotation and repositioning, the original clamping area can be supplemented for processing, realizing complete milling without blind spots, as well as interference-free milling of the valve seat workpiece 14 in all circumference and all positions. It does not require complete disassembly and repeated positioning, eliminating the cumulative error caused by multiple clamping in the prior art, thereby making the milling accuracy of the valve seat workpiece 14 higher.

[0045] Secondly: In the existing technology, when processing different types of valve seats, changing products requires a lot of adjustments to the tooling and processing procedures, which makes it difficult to adapt to the curved surface processing features of valve seat workpieces 14 of different specifications.

[0046] By operating the milling assembly, it can be adapted to valve seat workpieces 14 of different diameters and models. When processing valve seat workpieces 14 of different specifications, there is no need to change tooling a lot, which greatly reduces the workload of tooling adjustment and program debugging, realizes multi-purpose use of one machine, and improves the versatility of the valve seat workpiece 14 milling production line.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A valve seat milling device for ventilation valves, characterized in that: The milling machine includes a milling machine body (11), a multi-axis robotic arm (12) mounted on the milling machine body (11), a milling cutter (13) mounted on the multi-axis robotic arm (12), a valve seat workpiece (14) on the milling machine body (11), and a milling assembly on the milling machine body (11). The milling assembly includes a base (21), which is fixedly connected to the milling machine body (11). An inner cavity (22) is opened in the base (21), and four guide grooves are arranged in a ring array on the top of the base (21). (23) The guide groove (23) is connected to the interior of the inner cavity (22). Each guide groove (23) is slidably connected to a clamping plate (24). Each clamping plate (24) is fixedly connected to a rubber pad (26) on the side facing the center of the base (21). The top surface of the base (21) is provided with four pressure plates (212). Each clamping plate (24) and the rubber pad (26) are symmetrically provided with two through grooves (217). Each clamping plate (24) is provided with two rollers (222). The milling assembly also includes four sealing strips (25), which are fixedly connected to four guide grooves (23) respectively. The sealing strips (25) are fixedly connected to the corresponding clamping plates (24). A servo motor (27) is fixedly connected to the bottom of the groove wall of the inner cavity (22). The servo motor (27) includes a fixed end and an output shaft. The output shaft end of the servo motor (27) faces upward. A turntable (28) is fixedly connected to the output shaft end of the servo motor (27). Four connecting rods (29) are rotatably connected in a ring array on the turntable (28). The ends of the four connecting rods (29) away from the turntable (28) are rotatably connected to the bottom ends of the four clamping plates (24) respectively. A sliding groove (210) is opened on each of the four clamping plates (24). A sliding rod (211) is slidably connected in each sliding groove (210). The four pressure plates (212) are fixedly connected to the top ends of the four sliding rods (211) respectively. Each slide bar (211) has a sliding frame (213) slidably connected to its bottom end. The four sliding frames (213) are fixedly connected to a connecting frame (214) at the end near the first servo motor (27). The bottom of the groove wall of the inner cavity (22) is fixedly connected to the second servo motor (215). The second servo motor (215) includes a fixed end and an output shaft. The output shaft end of the second servo motor (215) faces upward. The output shaft end of the second servo motor (215) is fixedly connected to a threaded rod (216). Each clamping plate (24) has a guide fixedly connected to the side away from the rubber pad (26). Each guide rod (218) has a sliding connecting plate (219) connected to it. Each guide rod (218) has a tension spring (220) fitted on it. Both ends of the connecting plate (219) extend into the adjacent through slot (217). Both ends of each connecting plate (219) are fixedly connected to a servo motor three (221). The servo motor three (221) includes a fixed end and an output shaft. The output shaft end of the servo motor three (221) faces downward. Each roller (222) is fixedly connected to the output shaft end of the corresponding servo motor three (221).

2. The ventilation valve seat milling device according to claim 1, characterized in that: The sealing strip (25) is set in a stacked pleated shape and is made of rubber.

3. The ventilation valve seat milling device according to claim 1, characterized in that: The side of the rubber pad (26) away from the clamping plate (24) is provided with a frosted anti-slip surface. The rubber pad (26) is pressed against the outer wall of the valve seat workpiece (14). The roller (222) is pressed against the outer wall of the valve seat workpiece (14). The pressure plate (212) is pressed against the top surface of the valve seat workpiece (14). The lower surface of the pressure plate (212) is provided with a frosted rubber anti-slip surface.

4. The ventilation valve seat milling device according to claim 1, characterized in that: The milling machine body (11) has a built-in control system. The multi-axis robotic arm (12), servo motor one (27), servo motor two (215), and servo motor three (221) are all electrically connected to the control system of the milling machine body (11).

5. The ventilation valve seat milling device according to claim 1, characterized in that: Each sliding frame (213) is slidably connected to the side of the groove wall of the inner cavity (22) at the end away from the connecting frame (214), and the threaded rod (216) is threadedly connected to the connecting frame (214).

6. The ventilation valve seat milling device according to claim 1, characterized in that: The two ends of the tension spring (220) are fixedly connected to the guide rod (218) and the connecting plate (219), respectively.

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