Valve body inner hole polishing device

Abstract

The invention relates to the technical field of valve body grinding and polishing, and discloses a valve body inner hole polishing device which comprises a polishing part, the polishing part comprises a workbench, the workbench is slidably connected with a driving seat through a sliding rail arranged on the upper surface of the workbench, the interior of the driving seat is in transmission connection with a main shaft, and the outer surface of the main shaft is sleeved with a transmission shaft; and a polishing structure for polishing an inner hole of the outer valve body core is arranged on the outer surface of the transmission shaft. The valve body inner hole polishing device can effectively solve the problems that in the prior art, when a valve body core in a ball valve is ground and polished, due to the fact that a ball body of the valve body core is regular in shape and smooth in surface, a traditional clamp is difficult to be tightly attached to and stably fixed to the surface of the ball body, and the ball body is prone to shifting or rotating in the polishing process; the problems that the polishing position deviates from a preset track, the polishing precision of the inner hole is affected, uneven polishing traces appear on the surface of the inner hole, and the product quality is reduced are solved.

Description

Technical Field

[0001] This invention relates to the field of valve body grinding and polishing technology, and specifically to a valve body internal bore polishing device. Background Technology

[0002] Ball valves are widely used in high-pressure, low-temperature, or high-purity fluid control systems in long-distance pipelines, liquefied natural gas, and aerospace propellants due to their low flow resistance, reliable sealing, and rapid opening and closing. The valve body core is the key moving part of the ball valve that enables its sealing function. The surface finish of its internal through-hole directly affects the fluid flow resistance, sealing performance, and service life. To ensure the working accuracy and stability of the ball valve, the inner hole must undergo high-precision grinding and polishing after the valve ball is machined.

[0003] In the existing technology, when grinding and polishing the valve body core inside the ball valve, the ball of the valve body core has a regular shape and a smooth surface. Traditional fixtures are difficult to achieve a tight fit and stable fixation with the ball surface. During polishing, the ball is prone to displacement or rotation. This not only causes the polishing position to deviate from the predetermined trajectory, affecting the accuracy of the inner hole polishing, but also causes uneven polishing marks on the inner hole surface, reducing product quality. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, this invention provides a valve body inner hole polishing device. This device effectively solves the problem that, in existing technologies, when grinding and polishing the valve body core inside a ball valve, the spherical shape of the valve body core is regular and its surface is smooth. Traditional fixtures are difficult to achieve a tight fit and stable fixation with the spherical surface. During polishing, the spherical body is prone to displacement or rotation. This not only causes the polishing position to deviate from the predetermined trajectory, affecting the accuracy of inner hole polishing, but also causes uneven polishing marks on the inner hole surface, reducing product quality.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a valve body bore polishing device, comprising: The polishing section includes a worktable, a drive seat is slidably connected to the worktable via a slide rail on its upper surface, a main shaft is internally connected to the drive seat, a drive shaft is sleeved on the outer surface of the main shaft, and a polishing structure for polishing the inner hole of the external valve body core is provided on the outer surface of the drive shaft. The placement part includes a column fixed to the upper surface of the workbench, a top plate fixedly connected to the top of the column, a connecting seat fixedly connected to the middle of the column, a bidirectional threaded rod rotatably connected to the middle of the connecting seat, the top end of the bidirectional threaded rod being rotatably connected to the lower surface of the top plate, the bottom end of the bidirectional threaded rod being rotatably connected to the upper surface of the workbench, and a clamping member for clamping the valve body core being provided on the outer surface of the bidirectional threaded rod. The polishing structure includes a connecting ear, which is rotatably connected to a connecting rod via a rotating shaft located inside it. A torsion spring connected to the inside of the connecting rod is sleeved on the outer surface of the rotating shaft. A universal ball is fixedly connected to the end of the connecting rod away from the connecting ear, and a polishing plate is rolledly connected to the outer circumference of the universal ball.

[0006] Furthermore, the clamping member includes a lifting plate rotatably connected to the outer circumferential surface of the bidirectional threaded rod. Two lifting plates are provided, and the two lifting plates are symmetrically distributed on the upper and lower sides of the connecting seat. The lifting plates adopt a ring structure. A bracket is fixedly connected to the side of the lifting plate near the connecting seat. A support block is rotatably connected to the end of the bracket away from the lifting plate. A return spring connected to the inside of the support block is provided inside the bracket.

[0007] Furthermore, multiple support blocks are provided, and the multiple support blocks are arranged in a circular array around the lifting plate. The outer surface of the support blocks adopts a concave arc surface structure design.

[0008] Furthermore, a valve stem groove is provided on the outer surface of the valve body core, a hydraulic rod is fixedly connected to the lower surface of the top plate, an output rod is slidably connected to the output end of the hydraulic rod, and a positioning element is provided on the lower surface of the output rod through a lifting plate located above.

[0009] Furthermore, the positioning component includes a connecting rod rotatably connected to the bottom end of the output rod. There are two connecting rods, which are symmetrically distributed around the connecting rod. The end of the connecting rod away from the output rod is rotatably connected to a pressing block that fits against the inner wall of the valve stem groove. The adjacent surfaces of the two pressing blocks are magnetically designed.

[0010] Furthermore, a limiting plate is fixedly connected to the outer end of the main shaft, a rotating rod is rotatably connected to the outer circumference of the main shaft, a rotating rod is rotatably connected to the end of the rotating rod away from the main shaft, and the end of the rotating rod away from the rotating rod is rotatably connected to the outer circumference of the transmission shaft.

[0011] Furthermore, a tension spring connected to the outer surface of the main shaft is provided at one end of the drive shaft near the drive seat, and a rubber pad is provided at one end of the limiting plate near the drive shaft.

[0012] Furthermore, the worktable is connected to a sleeve via a connecting column that slides on its upper surface. The inner circumferential wall of the sleeve is designed with a wave-like structure, and the connecting rod is inclined.

[0013] The technical solution provided by this invention has the following advantages compared with the prior art: This invention features a polishing structure and a positioning component. The placement section employs two upper and lower lifting plates and a circumferential array of multiple support blocks. The two lifting plates move in opposite directions via the reverse threads of a bidirectional threaded rod, causing the upper and lower support blocks to form a ring-like clamping grip on the valve body core. A return spring provides continuous elastic pressure to the support blocks, ensuring a tight fit between the concave arc surface and the spherical surface. Simultaneously, the positioning component's pressure block is embedded in the valve stem groove. Through the combined action of the hydraulic rod pressure and the rubber anti-slip layer, rotation of the valve body core is prevented during polishing, improving polishing accuracy. This avoids the problems of existing devices that often use single or two-point clamping for spherical workpieces, which are prone to workpiece displacement or rotation due to polishing vibration, resulting in a high scrap rate. Furthermore, the positioning component, targeting the spherical valve stem groove structure of the valve body core, forces the circumferential position of the valve body core to be fixed, providing a prerequisite guarantee for high-precision polishing of the valve body's inner bore. This ensures that when clamping valve body cores of different sizes, the axis of the valve body core's inner bore always coincides with the axis of the spindle. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention; Figure 2 This is a cross-sectional structural diagram of the workbench according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the workbench, column, sleeve, and spindle in an embodiment of the present invention; Figure 4 This is a schematic diagram of the main shaft, drive shaft, and tension spring according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the separate structure of the main shaft, drive shaft, and polishing structure according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the placement part and valve body core according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the lifting plate, bracket, and support plate according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the separation structure of the clamping member according to an embodiment of the present invention; Figure 9 This is an embodiment of the present invention. Figure 2 A magnified structural diagram of part A in the middle; Figure 10 This is an embodiment of the present invention. Figure 2A magnified structural diagram of section B in the middle.

[0016] The labels in the diagram represent: 1. Polishing section; 11. Worktable; 111. Slide rail; 112. Connecting column; 12. Main spindle; 13. Drive shaft; 14. Polishing structure; 141. Connecting ear; 142. Connecting rod; 143. Torsion spring; 144. Universal ball; 145. Polishing plate; 15. Limiting plate; 151. Rotating rod one; 152. Rotating rod two; 153. Tension spring; 16. Sleeve; 2. Placement section; 21. Column; 22. Top plate; 23. Connecting seat; 24. Two-way threaded rod; 25. Clamping component; 251. Lifting plate; 252. Bracket; 253. Support block; 254. Return spring; 26. Hydraulic rod; 261. Output rod; 27. Positioning component; 271. Connecting rod; 272. Pressing block; 3. Valve body core; 31. Valve stem groove. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0018] The present invention will be further described below with reference to embodiments.

[0019] Example: Please see Figures 1-10 The present invention provides a technical solution: a valve body internal bore polishing device, comprising: Polishing part 1 includes a worktable 11. The worktable 11 is slidably connected to a drive seat via a slide rail 111 on its upper surface. The drive seat is internally connected to a main shaft 12. A drive shaft 13 is sleeved on the outer surface of the main shaft 12. A polishing structure 14 for polishing the inner hole of the outer valve body core 3 is provided on the outer surface of the drive shaft 13. The placement part 2 includes a column 21 fixed to the upper surface of the workbench 11. A top plate 22 is fixedly connected to the top of the column 21, and a connecting seat 23 is fixedly connected to the middle of the column 21. A bidirectional threaded rod 24 is drivenly connected to the middle of the connecting seat 23. The top end of the bidirectional threaded rod 24 is rotatably connected to the lower surface of the top plate 22, and the bottom end of the bidirectional threaded rod 24 is rotatably connected to the upper surface of the workbench 11. A clamping member 25 for clamping the valve body core 3 is provided on the outer surface of the bidirectional threaded rod 24. The polishing structure 14 includes a connecting ear 141, which is rotatably connected to a connecting rod 142 via a rotating shaft located inside it. A torsion spring 143 connected to the inside of the connecting rod 142 is sleeved on the outer surface of the rotating shaft. A universal ball 144 is fixedly connected to the end of the connecting rod 142 away from the connecting ear 141. A polishing plate 145 is rolled on the outer circumference of the universal ball 144.

[0020] The clamping member 25 includes a lifting plate 251 that is rotatably connected to the outer circumferential surface of the bidirectional threaded rod 24. There are two lifting plates 251, which are symmetrically distributed on the upper and lower sides of the connecting seat 23. The lifting plate 251 adopts a ring structure. A bracket 252 is fixedly connected to the side of the lifting plate 251 near the connecting seat 23. A support block 253 is rotatably connected to the end of the bracket 252 away from the lifting plate 251. A return spring 254 connected to the inside of the support block 252 is provided inside the support block 253.

[0021] Multiple support blocks 253 are provided, and the multiple support blocks 253 are arranged in a circular array around the lifting plate 251. The outer surface of the support blocks 253 adopts a concave arc surface structure design.

[0022] In the initial state, under the action of the return spring 254, the concave arc surface of the lower support block 253 faces upward, and the concave arc surface of the upper support block 253 faces downward.

[0023] The outer surface of the valve body core 3 is provided with a valve stem groove 31. The lower surface of the top plate 22 is fixedly connected with a hydraulic rod 26. The output end of the hydraulic rod 26 is slidably connected with an output rod 261. The lower surface of the output rod 261 passes through a lifting plate 251 located above and is provided with a positioning element 27.

[0024] The positioning component 27 includes a connecting rod 271 that is rotatably connected to the bottom end of the output rod 261. There are two connecting rods 271, which are symmetrically distributed around the connecting rod 271. The end of the connecting rod 271 away from the output rod 261 is rotatably connected to a pressing block 272 that fits against the inner wall of the valve stem groove 31. The adjacent surfaces of the two pressing blocks 272 are magnetically designed.

[0025] A limit plate 15 is fixedly connected to the outer end of the main shaft 12. A rotating rod 151 is rotatably connected to the outer circumference of the main shaft 12. A rotating rod 152 is rotatably connected to the end of the rotating rod 151 away from the main shaft 12. The end of the rotating rod 152 away from the rotating rod 151 is rotatably connected to the outer circumference of the transmission shaft 13.

[0026] A tension spring 153 connected to the outer surface of the main shaft 12 is provided at one end of the drive shaft 13 near the drive seat, and a rubber pad is provided at one end of the limiting plate 15 near the drive shaft 13.

[0027] The worktable 11 is connected to a sleeve 16 via a connecting post 112 that slides on its upper surface. The inner circumference of the sleeve 16 has a wave-shaped structure design, and the connecting rod 142 is inclined. The wave-shaped structure of the inner circumference of the sleeve 16 fits into the hinge points of rotating rod 151 and rotating rod 152. The smaller the diameter of the inner wall of the sleeve 16, the closer the hinge points of rotating rod 151 and rotating rod 152 are to the axis of the main shaft 12 in the radial direction, i.e., the tension spring 153 is in a stretched and unfolded state. The larger the diameter of the inner wall of the sleeve 16, the farther the radial distance between the hinge points of rotating rod 151 and rotating rod 152 and the axis of the main shaft 12 is, i.e., the tension spring 153 is in a contracted state.

[0028] The valve body core 3 is the workpiece to be polished, and its outer surface has a valve stem groove 31. (The valve body core 3 is spherical in shape, which allows it to rotate 360 ​​degrees within the valve body, providing a convenient operating method for fluid control. The valve stem groove 31 is an inherent structure of the valve body core 3. When the valve body core 3 rotates, the connection between the through hole and the pipe inside the sphere changes, thereby enabling the conduction, cut-off, and flow regulation of the fluid. For example, in the fully open state, the fluid can flow smoothly through the through hole of the valve body core 3 with almost no resistance; while in the closed state, the solid part of the sphere blocks the fluid, preventing it from passing through. In addition, the valve stem groove 31 on the outer surface of the valve body core 3 is used to connect with the valve stem, so that the valve stem can transmit external operating force to the valve body core 3 through the cooperation of the valve stem groove 31, driving it to rotate.)

[0029] The upper surface of the worktable 11 in the polishing section 1 is machined with two parallel slide rails 111. The drive seat is slidably connected to the slide rails 111 via a bottom slider, and can make linear reciprocating motion along the slide rails 111 to adjust the distance from the placement section 2.

[0030] The drive housing is internally connected to the main shaft 12 via bearings, and the main shaft 12 is driven to rotate by a motor built into the drive housing. A transmission shaft 13 is movably sleeved on the outer surface of the main shaft 12. The transmission shaft 13 is coaxially arranged with the main shaft 12, can rotate synchronously with the main shaft 12, and can move slightly radially along the main shaft 12.

[0031] A limit plate 15 is welded and fixed to the outer end of the main shaft 12. A rubber pad is attached to the end of the limit plate 15 near the drive shaft 13 to prevent the drive shaft 13 from colliding with the limit plate 15 and causing wear. Five rotating rods 151 are rotatably connected to the outer circumference of the main shaft 12 via pins. The ends of the rotating rods 151 away from the main shaft 12 are rotatably connected to the rotating rods 152 via the same pin. The ends of the rotating rods 152 away from the rotating rods 151 are rotatably connected to the outer circumference of the drive shaft 13 via pins, forming a hinge structure. The rotating rods 151 and 152 are arranged in a circular array around the axis of the main shaft 12. A tension spring 153 is welded to the end of the drive shaft 13 near the drive seat. The other end of the tension spring 153 is fixedly connected to the inner wall of the groove section on the outer surface of the main shaft 12. In the initial state, the tension spring 153 is in a contracted state.

[0032] The upper surface of the worktable 11 is also slidably connected to a connecting column 112. The specific position of the connecting column 112 can be adjusted by sliding according to the size of the valve core 3 being processed. The top of the connecting column 112 is fixed to the connecting sleeve 16 by bolts. The sleeve 16 is sleeved on the outside of the hinge point between the first rotating rod 151 and the second rotating rod 152. Its inner circumference wall adopts a wave structure design, with a height difference between the wave protrusions and concaves. The inner wall material is wear-resistant alloy steel.

[0033] Five evenly distributed connecting lugs 141 are welded to the outer surface of the drive shaft 13. A rotating shaft passes through each connecting lug 141, and a connecting rod 142 is rotatably connected to the rotating shaft. The connecting rod 142 is inclined. A torsion spring 143 is fitted on the outer surface of the rotating shaft. One end of the torsion spring 143 is embedded in the connecting lug 141, and the other end is embedded in the connecting rod 142. In the initial state, the torsion spring 143 is in a naturally extended state, keeping the connecting rod 142 at an inclined angle with a large angle between it and the axis of the drive shaft 13. The end of the connecting rod 142 away from the connecting lug 141 is fixedly connected to a universal ball 144. A polishing plate 145 is rolled on the outer circumference of the universal ball 144. The polishing surface of the polishing plate 145 is detachably attached with diamond abrasive cloth. A groove is opened on the back of the polishing plate 145 to ensure that the polishing plate 145 can rotate flexibly with the universal ball 144.

[0034] The placement section 2 includes four vertically fixed columns 21 on the upper surface of the worktable 11. The four columns 21 are arranged in a rectangular shape, and their tops are fixedly connected to a top plate 22 by bolts. A connecting seat 23 is fixedly connected to the middle of every two columns 21 by bolts. A bidirectional threaded rod 24 is connected to the middle of the connecting seat 23 via a bearing drive. The top end of the bidirectional threaded rod 24 is rotatably connected to the lower surface of the top plate 22 via a bearing, and the bottom end is rotatably connected to the upper surface of the worktable 11 via a bearing.

[0035] Two clamping members 25 are provided on the outer surface of the bidirectional threaded rod 24. The clamping members 25 include lifting plates 251 that are threadedly connected to the outer circumference of the bidirectional threaded rod 24. The two lifting plates 251 are respectively matched with the reverse threads of the upper and lower sections of the bidirectional threaded rod 24 and are symmetrically distributed on the upper and lower sides of the connecting seat 23. The lifting plates 251 adopt a ring structure. Multiple evenly distributed brackets 252 are welded on the side of the lifting plates 251 near the connecting seat 23. The multiple brackets 252 are arranged in a circumferential array around the lifting plates 251.

[0036] One end of the bracket 252 away from the lifting plate 251 is rotatably connected to a support block 253 via a pin. The support block 253 has an internal mounting groove, within which a return spring 254 is installed. One end of the return spring 254 is fixedly connected to the inside of the bracket 252, and the other end is fixedly connected to the inner wall of the mounting groove in the support block 253. The outer surface of the support block 253 adopts a concave arc surface design. In the initial state, under the action of the return spring 254, the concave arc surface of the lower support block 253 faces upward, and the concave arc surface of the upper support block 253 faces downward, forming a ring-shaped support structure for the valve body core 3.

[0037] A hydraulic rod 26 is bolted to the lower surface of the top plate 22. An output rod 261 is slidably connected to the output end of the hydraulic rod 26. The lower surface of the output rod 261 penetrates the hollow part of the upper lifting plate 251 and is provided with a positioning element 27. The positioning element 27 includes two connecting rods 271 that are rotatably connected to the bottom end of the output rod 261 by a pin. The two connecting rods 271 are symmetrically distributed with the output rod 261 as the center. The end of the connecting rod 271 away from the output rod 261 is rotatably connected to a pressing block 272 by a pin. The outer side of the pressing block 272 is in contact with the inner wall of the valve stem groove 31. A rubber anti-slip layer is pasted on its outer surface. Magnets are embedded in the adjacent surfaces of the two pressing blocks 272. In the initial state, they are attached by magnetic attraction.

[0038] The process of clamping valve body core 3: In the initial state, the distance between the two lifting plates 251 is at its maximum, with the lower lifting plate 251 at its lowest point within its travel range and the upper lifting plate 251 at its highest point within its travel range.

[0039] When the valve body core 3 is placed on the concave arc surface of the support block 253 of the lower lifting plate 251 using an external robotic arm, the robotic arm passes through the through hole inside the valve body core 3, and the top of the robotic arm is embedded in the valve stem groove 31 of the valve body core 3, ensuring that the groove opening of the valve stem groove 31 is directly above when placed. Under the action of the return spring 254, the lower support block 253 fits against the outer surface of the valve body core 3 through the concave arc surface to achieve initial support.

[0040] The bidirectional threaded rod 24 is driven to rotate. Since the upper and lower lifting plates 251 are respectively engaged with the reverse threads, the two lifting plates 251 move towards each other along the bidirectional threaded rod 24 and are adjusted to a distance suitable for the outer surface diameter of the valve body core 3 to be polished.

[0041] Start the hydraulic rod 26, drive the output rod 261 to extend downward, and drive the positioning part 27 to extend into the valve stem groove 31 of the valve body core 3. At this time, the two pressing blocks 272 are attached under the action of magnetic force and smoothly enter the valve stem groove 31. Continue to push the output rod 261 downward, and the pressing blocks 272 are squeezed by the inner wall of the valve stem groove 31, overcome the magnetic force and open to both sides. Through the connecting rod 271, rotate around the bottom end of the output rod 261 until the outer surface of the pressing block 272 away from the magnetic design is completely attached to the inner wall of the valve stem groove 31 (the outer surface of the pressing block 272 away from the magnetic design is provided with a silicone layer), and the positioning is completed.

[0042] Rotate the bidirectional threaded rod 24 again to drive the upper lifting plate 251 to move downward and the lower lifting plate 251 to move upward. Under the action of the return spring 254, the upper support block 253 fits against the outer surface of the upper half of the valve body core 3 through the concave arc surface, and cooperates with the lower support block 253 to form an upper and lower ring clamping, ensuring that the valve body core 3 is firmly fixed and does not shake.

[0043] The process of polishing the inner hole of valve body core 3: The drive seat moves along the slide rail 111 toward the placement part 2, causing the polishing structure 14 to move into the inner hole of the valve body core 3. In the initial state, the connecting rod 142 is retracted inside the sleeve 16 and is in a retracted state. At this time, the angle between the connecting rod 142 and the axis of the main shaft 12 is small, and the torsion spring 143 inside the connecting lug 141 is in a compressed state.

[0044] The built-in motor of the drive unit is started, driving the main shaft 12 to rotate. A sliding groove is formed on the outer surface of the main shaft 12, and a through groove is formed in the middle of the drive shaft 13 that slides in contact with the sliding groove on the outer surface of the main shaft 12. The drive shaft 13 can move axially relative to the main shaft 12, while the two remain relatively stationary radially. When the main shaft 12 rotates, the drive shaft 13 rotates synchronously, driving the connecting lug 141, connecting rod 142, and polishing plate 145 to rotate. At this time, the tension spring 153 connecting the main shaft 12 and the drive shaft 13 is in a contracted state. The angle between the axis of the main shaft 12 and the first rotating rod 151 is relatively large, and the angle between the axis of the drive shaft 13 and the second rotating rod 152 is also relatively large. The first rotating rod 151 and the second rotating rod 152 adopt the same structural design and have the same length.

[0045] As the drive seat drives the main shaft 12, transmission shaft 13 and polishing structure 14 to continue moving toward the inner hole of the valve body core 3, the sleeve 16 is fixed in position, and the sleeve 16 and polishing structure 14 move relative to each other. The polishing structure 14 will move toward the side of the sleeve 16 away from the drive seat.

[0046] When the polishing structure 14 initially enters the inner hole of the valve body core 3, the polishing plate 145 is in a retracted state. At this time, the connecting rod 142 is blocked by the inner wall of the outer end of the sleeve 16, and the torsion spring 143 is in a compressed and stored state, ensuring that the polishing structure 14 can smoothly extend into the inner hole without interfering with the inner hole wall. As the drive seat moves the polishing part 1 as a whole along the slide rail 111, when the polishing structure 14 moves to the side of the sleeve 16 away from the drive seat until it is fully inserted into the inner hole, the connecting rod 142 is no longer blocked by the inner wall of the sleeve 16, the elastic potential energy stored in the torsion spring 143 is released, and a radial force is given to the connecting rod 142 to expand outward, pushing the connecting rod 142 to rotate outward around the pivot in the connecting lug 141, thereby driving the polishing plate 145 to move towards the inner hole wall until the outer surface of the polishing plate 145 is in close contact with the inner hole wall of the valve body core 3.

[0047] During the contact process between the polishing plate 145 and the inner bore wall, due to slight deviations in the bore diameter or changes in surface curvature of the valve body core 3, traditional fixed-angle polishing equipment is prone to problems such as localized loose fit or excessive compression. However, the universal ball 144, connected between the end of the connecting rod 142 and the polishing plate 145, rolls with the polishing plate 145 on its outer circumference, allowing for flexible 360-degree rotation and multi-angle adjustment. When the polishing plate 145 contacts the inner bore wall under the thrust of the torsion spring 143, if there is a protrusion or curvature change in the inner bore wall at that location, the polishing plate 145 will be subjected to a reverse force from the inner bore wall. At this time, the universal ball 144 can roll along the direction of the force and drive the polishing plate 145 to finely adjust its angle, ensuring that the polishing plate 145 always maintains a close fit with the inner bore wall. This avoids polishing omissions caused by incomplete contact or damage to the inner bore wall caused by hard compression, achieving initial contact between the polishing plate 145 and the inner bore wall.

[0048] During the polishing process, the drive seat moves slowly along the slide rail 111, causing the polishing structure 14 to move axially along the inner hole of the valve body core 3. At the same time, the wave-shaped inner wall of the sleeve 16 is in contact with the outer circumferential surface of the hinge point of the first rotating rod 151 and the second rotating rod 152. When the hinge point moves to a position with a smaller inner diameter of the sleeve 16, the hinge point is compressed. On the side radially closer to the axis of the main shaft 12, the tension spring 153 is stretched, causing the transmission shaft 13 to move outward in the axial direction, and the pressure of the polishing plate 145 on the hole wall increases. When the hinge point moves to a position with a larger inner diameter of the sleeve 16, the hinge point moves radially away from the axis of the main shaft 12, the tension spring 153 contracts, and the transmission shaft 13 moves inward in the axial direction while rotating. Similarly, the polishing plate 145 also retracts slightly in the axial direction while rotating.

[0049] As the drive shaft 13 rotates, the hinge points of the first rotating rod 151 and the second rotating rod 152 move in a circular motion along the wave-shaped inner wall of the sleeve 16, thereby triggering the axial extension and retraction of the drive shaft 13, which in turn drives the polishing plate 145 to achieve periodic reciprocating motion. This ensures polishing efficiency while avoiding the problem of insufficient surface flatness caused by single pressure polishing. At the same time, the combination of axial reciprocating motion and the slow movement of the drive seat forms a spiral-covered polishing path, completely eliminating the polishing dead angles in the axial direction of the inner hole, ensuring that the overall surface roughness of the inner hole wall is uniform and consistent, meeting the polishing requirements of the valve body core 3 inner hole of the high-precision ball valve. This high-frequency axial kneading reciprocating motion avoids the spiral marks caused by simple rotation, and the final inner wall surface is non-directional with a more uniform gloss.

[0050] The inclined setting of the connecting rod 142, combined with the elastic action of the torsion spring 143, allows the polishing plate 145 to adapt to slight taper or curvature changes in the inner hole. The rolling connection of the universal ball 144 allows the polishing plate 145 to adjust the contact angle in real time, ensuring that all parts of the inner wall of the inner hole are polished evenly and avoiding polishing dead corners. After the polishing plate 145 completes its movement through the through hole under the action of the drive seat, it retracts backward to achieve overall polishing of the inner hole of the valve body core 3.

[0051] During the polishing process of the polishing structure 14 polishing the inner hole of the valve body core 3, the upper and lower sides of the valve body core 3 are stably clamped by the clamping parts 25, while the valve stem groove 31 at the top of the valve body core 3 is stably positioned by the pressing block 272 in the positioning part 27, so as to prevent it from rotating and shifting position during the polishing process.

[0052] After polishing is completed: After polishing is completed, the motor is turned off, the spindle 12 stops rotating, and the drive seat continues to move in the opposite direction along the slide rail 111, causing the polishing structure 14 to exit the inner hole of the valve body core 3. The control hydraulic rod 26 drives the output rod 261 to retract upward, the positioning piece 27 exits the valve stem groove 31, and the two pressure blocks 272 re-fit under magnetic force. The bidirectional threaded rod 24 is rotated in the opposite direction, driving the upper lifting plate 251 to move upward and the lower lifting plate 251 to move downward, releasing the upper clamping of the valve body core 3, and the polished valve body core 3 can then be removed.

[0053] In summary, the valve body's internal bore polishing device has the following advantages: Advantage 1: For the spherical shape of the valve body core 3 and its inherent valve stem groove 31 structure, the device achieves precise positioning through the clamping component 25 and the positioning component 27. The combination of multi-point encirclement and valve stem groove 31 positioning provides a prerequisite for high-precision polishing of the valve body's inner bore. The support block 253 of the clamping component 25 adopts a concave arc surface structure, which, together with the pressure block 272 in the positioning component 27 that matches the shape of the valve stem groove 31, can precisely fit the inherent structure of the valve body core 3 without requiring additional processing or modification of the workpiece.

[0054] Advantage 2: Existing devices often use single-point or two-point clamping for spherical workpieces, which can easily lead to workpiece displacement or rotation due to polishing vibration, resulting in a high scrap rate. In contrast, the placement part 2 of this invention employs a structure of two upper and lower lifting plates 251 and multiple circumferentially arrayed support blocks 253. The two lifting plates 251 move towards each other via the reverse threads of the bidirectional threaded rod 24, causing the upper and lower support blocks 253 to form a ring-like clamping grip on the valve body core 3. The return spring 254 provides continuous elastic pressure to the support blocks 253, ensuring a tight fit between the concave arc surface and the spherical surface. Simultaneously, the pressure block 272 of the positioning member 27 is embedded in the valve stem groove 31. Through the combined action of the pressure of the hydraulic rod 26 and the rubber anti-slip layer, rotation of the valve body core 3 during polishing is prevented, improving polishing accuracy.

[0055] Thirdly, existing devices mostly use fixed-specification clamping, requiring disassembly and replacement of the clamps when changing workpiece specifications. However, the bidirectional threaded rod 24 can adjust the distance between the two lifting plates 251 to accommodate valve body cores 3 with different outer surface diameters. At the same time, the support block 253 can rotate relative to the bracket 252. Under the action of the return spring 254, the support block 253 is initially positioned with its concave surface facing up or down. When clamping valve body cores 3 with different diameters, the multiple circumferentially arrayed support blocks 253 will rotate synchronously, which can satisfy the clamping of valve body cores 3 with different outer surface diameters. In the polishing structure 14, the connecting rod 142 rotates under the action of the torsion spring 143. When the polishing structure 14 extends into the through hole of the valve body core 3, the torsion spring 143 gradually releases its pre-compression state as the transmission shaft 13 drives the connecting rod 142 to rotate. The elastic force drives the polishing plate 145 and the connecting rod 142 to rotate and unfold outward around the transmission shaft 13. This allows the polishing to adapt to valve body cores 3 with different inner hole diameters for inner hole polishing. It avoids the polishing dead angle caused by insufficient or excessive pressure due to insufficient contact of the traditional fixed-size polishing head, improves the versatility and applicability of the equipment, and eliminates the need for machine shutdown and switching.

[0056] Fourthly, the clamping component 25 of the placement section 2 uses multiple circumferential array support blocks 253 and bidirectional threaded rods 24 for synchronous adjustment to ensure that the axis of the inner hole of the valve body core 3 always coincides with the axis of the main shaft 12 when clamping valve body cores 3 of different sizes. The two lifting plates 251 move towards each other through the reverse threads of the bidirectional threaded rods 24, driving multiple upper and lower support blocks 253 to surround the outer surface of the valve body core 3 in a circumferential array. The outer surface of the support block 253 is a concave arc surface, and the return spring 254 provides continuous elastic pressure, so that the concave arc surface is in close contact with the surface of the ball, forcing the radial position of the valve body core 3 to be fixed, and preventing it from deviating from the axis due to gravity or vibration. During clamping, the external robotic arm first aligns the valve stem groove 31 of the valve body core 3 with the lower part of the positioning component 27, ensuring that the axis of the valve stem groove 31 coincides with the axis of the positioning component 27. Subsequently, the hydraulic rod 26 drives the output rod 261 to move downward, causing the pressure block 272 to embed into the valve stem groove 31. The rubber anti-slip layer of the two pressure blocks 272 adheres to the inner wall of the valve stem groove 31, forcibly fixing the circumferential position of the valve body core 3. Therefore, when the drive seat moves along the slide rail 111, the axis of the polishing structure 14 always coincides with the axis of the inner hole of the valve body core 3, laying the foundation for coaxiality. This ensures that the polishing pressure on each point on the circumference of the inner hole remains uniform, avoiding the problem of local over-polishing or under-polishing due to uneven pressure.

[0057] Advantage 5: Existing devices mostly use single rotation or linear polishing, which easily forms directional patterns in the inner hole. In contrast, the polishing structure 14 in this invention achieves a composite motion of rotational polishing and axial periodic reciprocating motion of the polishing plate 145 through rotating rod 151, rotating rod 152, tension spring 153, and sleeve 16. The axial movement of the drive seat along the slide rail 111 ensures full coverage of the inner hole. The engagement between the wave-shaped inner wall of the sleeve 16 and the hinge points of rotating rod 151 and rotating rod 152 creates a dense, non-overlapping spiral coverage path for the polishing plate 145. This ensures that the polishing tool can traverse every point in the inner hole, achieving uniform polishing without dead angles and guaranteeing a high degree of consistency in the overall surface roughness of the inner hole. At the same time, the high-frequency axial kneading reciprocating motion avoids the spiral patterns generated by simple rotation, resulting in a uniform and non-directional gloss on the inner hole surface.

[0058] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A valve body internal bore polishing device, characterized in that, include: Polishing section (1), the polishing section (1) includes a worktable (11), the worktable (11) is slidably connected to a drive seat via a slide rail (111) on its upper surface, the drive seat is internally connected to a main shaft (12), the outer surface of the main shaft (12) is fitted with a drive shaft (13), the outer surface of the drive shaft (13) is provided with a polishing structure (14) for polishing the inner hole of the external valve body core (3); The placement part (2) includes a column (21) fixed to the upper surface of the workbench (11). A top plate (22) is fixedly connected to the top of the column (21). A connecting seat (23) is fixedly connected to the middle of the column (21). A bidirectional threaded rod (24) is drivenly connected to the middle of the connecting seat (23). The top end of the bidirectional threaded rod (24) is rotatably connected to the lower surface of the top plate (22). The bottom end of the bidirectional threaded rod (24) is rotatably connected to the upper surface of the workbench (11). A clamping member (25) for clamping the valve core (3) is provided on the outer surface of the bidirectional threaded rod (24). The polishing structure (14) includes a connecting ear (141), which is rotatably connected to a connecting rod (142) via a rotating shaft located inside it. A torsion spring (143) connected to the inside of the connecting rod (142) is sleeved on the outer surface of the rotating shaft. A universal ball (144) is fixedly connected to one end of the connecting rod (142) away from the connecting ear (141), and a polishing plate (145) is rolled on the outer circumferential surface of the universal ball (144).

2. The valve body inner bore polishing device according to claim 1, characterized in that: The clamping member (25) includes a lifting plate (251) rotatably connected to the outer circumferential surface of the bidirectional threaded rod (24). There are two lifting plates (251), which are symmetrically distributed on the upper and lower sides of the connecting seat (23). The lifting plate (251) adopts a ring structure. A bracket (252) is fixedly connected to the side of the lifting plate (251) near the connecting seat (23). A support block (253) is rotatably connected to the end of the bracket (252) away from the lifting plate (251). A return spring (254) connected to the inside of the support block (252) is provided inside the support block (253).

3. The valve body inner bore polishing device according to claim 2, characterized in that: Multiple support blocks (253) are provided, and the multiple support blocks (253) are arranged in a circular array around the lifting plate (251). The outer surface of the support block (253) adopts a concave arc surface structure design.

4. The valve body inner bore polishing device according to claim 2, characterized in that: The outer surface of the valve body core (3) is provided with a valve stem groove (31). The lower surface of the top plate (22) is fixedly connected with a hydraulic rod (26). The output end of the hydraulic rod (26) is slidably connected with an output rod (261). The lower surface of the output rod (261) passes through a lifting plate (251) located above and is provided with a positioning element (27).

5. A valve body internal bore polishing device according to claim 4, characterized in that: The positioning component (27) includes a connecting rod (271) rotatably connected to the bottom end of the output rod (261). There are two connecting rods (271), which are symmetrically distributed around the connecting rod (271). The end of the connecting rod (271) away from the output rod (261) is rotatably connected to a pressing block (272) that fits against the inner wall of the valve stem groove (31). The adjacent surfaces of the two pressing blocks (272) are magnetically designed.

6. The valve body inner bore polishing device according to claim 1, characterized in that: The outer end of the main shaft (12) is fixedly connected to a limiting plate (15). A rotating rod (151) is rotatably connected to the outer circumference of the main shaft (12). A rotating rod (152) is rotatably connected to the end of the rotating rod (151) away from the main shaft (12). The end of the rotating rod (152) away from the rotating rod (151) is rotatably connected to the outer circumference of the transmission shaft (13).

7. A valve body internal bore polishing device according to claim 6, characterized in that: The drive shaft (13) is provided with a tension spring (153) connected to the outer surface of the main shaft (12) at one end near the drive seat, and the limiting plate (15) is provided with a rubber pad at one end near the drive shaft (13).

8. A valve body internal bore polishing device according to claim 1, characterized in that: The workbench (11) is connected to a sleeve (16) via a connecting column (112) that slides on its upper surface. The inner circumference of the sleeve (16) is designed with a wave-like structure, and the connecting rod (142) is set at an angle.

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