Manual butterfly valve for sterile powder transfer and valve plate machining method thereof

Abstract

The embodiment of the invention provides a manual butterfly valve for sterile powder transfer and a valve plate machining method. The butterfly valve comprises a valve seat, a valve rod and a valve plate, wherein the valve seat is provided with an axially-penetrating material channel; the valve seat comprises a first valve seat and a second valve seat connected with the first valve seat; the shaft sleeve assembly comprises a first shaft sleeve and a second shaft sleeve, the valve plate comprises a valve block and a rotating shaft, the valve block is located in the material channel of the valve seat, the rotating shaft is connected with the valve block, and two ends of the rotating shaft penetrate through the first shaft sleeve and the second shaft sleeve respectively after extending out of the valve block. The operation assembly is connected to one end of the rotating shaft close to the second shaft sleeve; the end, close to the operation assembly, of the second shaft sleeve is provided with a first positioning piece, the operation assembly is provided with a second positioning piece matched with the first positioning piece, and the operation assembly can move in the axial direction of the rotating shaft so that the second positioning piece can be clamped into or disengaged from the first positioning piece, and the rotating shaft can be locked or unlocked on the second shaft sleeve. The situation that the operation assembly is touched by mistake to drive the valve plate to rotate, the state of the material channel is changed, and normal conveying of materials is affected is prevented.

Description

Technical Field

[0001] This invention relates to the field of butterfly valve technology, and in particular to a manual butterfly valve for aseptic powder transfer and a valve plate processing method. Background Technology

[0002] In the production of sterile powdered pharmaceuticals, the butterfly valve, as a core opening and closing component connecting the material tank and the powder delivery pipeline, directly affects the continuity of the production process, product quality, and the assurance of a sterile environment. Traditional butterfly valves are typically driven manually or pneumatically, controlling the pipeline's opening and closing by rotating the valve plate. However, in actual production applications, it has been found that these traditional butterfly valves pose significant risks of misoperation. For example, when the butterfly valve is open and the powder is being normally transported in the pipeline, if the valve's operating mechanism (such as the handle) lacks effective locking, unintentional bumps or leaning by operators or maintenance personnel in the production area, or while operating other nearby equipment, may accidentally touch the butterfly valve handle, causing the valve to suddenly close or change the flow rate during transport. Alternatively, when the butterfly valve needs to remain strictly closed to isolate different batches or clean areas, the lack of locking may cause the valve plate to rotate, partially or completely opening the valve that should be sealed. Summary of the Invention

[0003] To improve at least some of the shortcomings or deficiencies in the prior art, embodiments of the present invention provide a manual butterfly valve for aseptic powder transfer and a valve plate processing method. By setting a first positioning element and a second positioning element, the operating component and the second bushing are locked, and the rotating shaft and the second bushing are further locked to prevent accidental activation of the operating component from causing the rotating shaft and valve plate to rotate and change the state of the material channel, thus affecting the normal material conveying.

[0004] This invention provides a manual butterfly valve for aseptic powder transfer, comprising: a valve seat forming an axially penetrating material channel; the valve seat including a first valve seat and a second valve seat connected to the first valve seat, the first valve seat and the second valve seat surrounding the material channel; a bushing assembly including a first bushing and a second bushing, the first bushing and the second bushing being disposed between the first valve seat and the second valve seat and arranged radially opposite to each other along the valve seat; a valve plate including a valve disc and a rotating shaft, the valve disc being located within the material channel of the valve seat, and the rotating shaft being connected to the valve disc; and... The valve plates extend from both ends and pass through the first bushing and the second bushing respectively. The rotating shaft is rotatably connected to the first bushing and the second bushing. An operating component is connected to the end of the rotating shaft near the second bushing. A first positioning element is provided at the end of the second bushing near the operating component, and a second positioning element matching the first positioning element is provided on the side of the operating component near the second bushing. The operating component can move axially along the rotating shaft to make the second positioning element engage or disengage from the first positioning element, so that the rotating shaft is locked or unlocked from the second bushing.

[0005] In some embodiments, the operating component includes a butterfly valve switch and a locking element, both of which are sleeved on the rotating shaft. One end of the butterfly valve switch is provided with a second positioning element, and the other end of the butterfly valve switch is provided with a receiving groove for accommodating the locking element. The end of the rotating shaft away from the first bushing passes through the butterfly valve switch and is located inside the locking element. The locking element can move axially along the rotating shaft to lock or unlock the butterfly valve switch.

[0006] In some embodiments, the first positioning element includes a first closed positioning element and a plurality of first open positioning elements, the first closed positioning element and the plurality of first open positioning elements being distributed circumferentially along the second bushing; when the second positioning element engages with the first closed positioning element, the valve plate is perpendicular to the axial direction of the valve seat to close the material channel; when the second positioning element engages with any one of the plurality of first open positioning elements, the valve plate opens the material channel.

[0007] In some embodiments, when the valve disc is axially perpendicular to the valve seat, there is a gap between the edge of the valve disc and the inner wall of the valve seat.

[0008] In some embodiments, a locking member is further included, one end of which passes through the operating component and abuts against the rotating shaft to lock the operating component and the rotating shaft, thereby restricting the movement of the operating component in the circumferential direction of the rotating shaft.

[0009] In some embodiments, the second bushing includes a first sub-shoulder and a second sub-shoulder, the first sub-shoulder is located on the side of the second sub-shoulder closer to the valve plate, the first positioning member is disposed on the side of the second sub-shoulder closer to the operating component, and the first sub-shoulder and the second sub-shoulder are made of different materials.

[0010] In some embodiments, a sealing ring is further included, which is installed between the rotating shaft and the first bushing, and between the rotating shaft and the first sub-shoulder, and the sealing ring is disposed around the rotating shaft.

[0011] In some embodiments, one of the first valve seat and the second valve seat is provided with a sealing groove, and the other is provided with a sealing protrusion that matches the sealing groove, wherein the sealing groove is located within the sealing protrusion.

[0012] In some embodiments, the first valve seat is provided with a plurality of first mounting slots, and the second valve seat is provided with a plurality of second mounting slots. The plurality of first mounting slots correspond one-to-one with the plurality of second mounting slots. The plurality of first mounting slots and the corresponding second mounting slots together enclose a bushing mounting space. The first bushing and the second bushing are respectively located within the plurality of bushing mounting spaces to restrict the movement of the first bushing and the second bushing in the axial direction of the rotating shaft.

[0013] Another embodiment of the present invention provides a method for processing a butterfly valve plate, comprising: cutting to obtain a plate, the plate comprising a circular portion and two square portions symmetrically arranged on both sides of the circular portion, the thickness of the plate being greater than the diameter of the rotating shaft of the valve plate to be processed; firstly, milling to process a valve plate and a rotating shaft connected to the center of the valve plate; firstly, turning to process the rotating shaft; secondly, milling to process the valve plate to a first thickness; secondly, turning to process the rotating shaft to a set diameter and processing the connecting portion on the rotating shaft; and thirdly, milling to process the outer periphery of the valve plate to a second thickness.

[0014] As can be seen from the above, the above-mentioned technical features of the present invention can have one or more of the following beneficial effects: The embodiments of the present invention provide a manual butterfly valve for aseptic powder transfer. By setting a first positioning element and a second positioning element, the operating component and the second bushing are locked, and the rotating shaft and the second bushing are further locked to prevent accidental contact of the operating component from causing the rotating shaft and valve plate to rotate and change the state of the material channel, thus affecting the normal conveying of materials.

[0015] This invention provides a valve plate processing method that integrates the rotating shaft and valve plate into a single unit, thereby enhancing the overall mechanical strength of the valve plate and avoiding assembly or welding defects. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments 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.

[0017] Figure 1 This is a schematic diagram of the structure of a manual butterfly valve for aseptic powder transfer provided in an embodiment of the present invention.

[0018] Figure 2 This is a structural diagram illustrating the usage state of a manual butterfly valve for aseptic powder transfer, provided in an embodiment of the present invention. Figure 3 This is a partial structural diagram of a manual butterfly valve for aseptic powder transfer provided in an embodiment of the present invention.

[0019] Figure 4 This is a cross-sectional schematic diagram of a manual butterfly valve for aseptic powder transfer provided in an embodiment of the present invention.

[0020] Figure 5 for Figure 4 Enlarged schematic diagram of the structure at point A in the diagram.

[0021] Figure 6 This is a cross-sectional schematic diagram of another state of a manual butterfly valve for aseptic powder transfer provided in an embodiment of the present invention.

[0022] Figure 7 This is a cross-sectional schematic diagram of a manual butterfly valve for aseptic powder transfer provided in an embodiment of the present invention.

[0023] Figure 8 This is a cross-sectional schematic diagram of another state of a manual butterfly valve for aseptic powder transfer provided in an embodiment of the present invention.

[0024] Figure 9 This is a cross-sectional structural schematic diagram from another perspective of a manual butterfly valve for aseptic powder transfer provided in an embodiment of the present invention.

[0025] Figure 10 A flowchart illustrating a butterfly valve plate processing method provided in an embodiment of the present invention.

[0026] Figure 11 This is a schematic diagram of the structure of a valve plate obtained by a butterfly valve plate processing method provided in an embodiment of the present invention.

[0027] Figure label: 10. Valve seat; 110. Material passage; 130. First valve seat; 131. First mounting groove; 140. Second valve seat; 141. Second mounting groove; 151. Sealing groove; 152. Sealing protrusion; 20. Bushing assembly; 210. First bushing; 220. Second bushing; 221. First sub-shoulder bushing; 222. Second sub-shoulder bushing; 30. Valve plate; 310. Valve disc; 320. Rotating shaft; 50. Operating assembly; 510. Butterfly valve switch; 511. Receiving groove; 512. Operating lever; 520. Locking element; 610. First positioning element; 620. Second positioning element; 70. Locking element; 80. Sealing ring; 90. Connecting clamp. Detailed Implementation

[0028] 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 embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6This invention provides a manual butterfly valve for aseptic powder transfer, comprising a valve seat 10, a bushing assembly 20, a valve plate 30, and an operating component 50. The valve seat 10 forms an axially penetrating material channel 110 for the passage of powder material. The valve seat 10 includes a first valve seat 130 and a second valve seat 140 connected to the first valve seat 130. The first valve seat 130 and the second valve seat 140 enclose the material channel 110. The first valve seat 130 and the second valve seat 140 achieve radial sealing through tight compression. By calculating appropriate tolerances, both sealing requirements are met, and disassembly and assembly are easy. The bushing assembly 20 includes a first bushing 210 and a second bushing 220, both disposed between the first valve seat 130 and the second valve seat 140 and arranged radially opposite to each other along the valve seat 10. The valve plate 30 includes a valve disc 310 and a rotating shaft 320. The valve disc 310 and the rotating shaft 320 are, for example, an integral design. The valve disc 310 is located within the material channel 110 of the valve seat 10. The rotating shaft 320 is connected to the valve disc 310, and its two ends extend beyond the valve disc 310, passing through the first bushing 210 and the second bushing 220 respectively. The rotating shaft 320 is rotatably connected to the first bushing 210 and the second bushing 220, thereby achieving a rotatable connection of the valve disc 310 relative to the valve seat 10. The operating component 50 is connected to the end of the rotating shaft 320 near the second bushing 220. The second bushing 220 is provided with a first positioning member 610 at one end near the operating component 50, and the operating component 50 is provided with a second positioning member 620 that matches the first positioning member 610 on one side near the second bushing 220. The operating component 50 can move along the axial direction of the rotating shaft 320 so that the second positioning member 620 can engage or disengage from the first positioning member 610, so that the rotating shaft 320 can be locked or unlocked in the second bushing 220.

[0030] like Figure 6 As shown, Figure 6 This is a schematic diagram showing the rotating shaft 320 and the second bushing 220 in the unlocked state. When it is necessary to change the state of the material channel 110, the operator first pulls the operating component 50 away from the second bushing 220 along the axial direction of the rotating shaft 320, causing the first positioning member 610 and the second positioning member 620 to separate, thereby releasing the locking between the operating component 50 and the second bushing 220 in the circumferential direction of the rotating shaft 320. The rotating shaft 320 and the second bushing 220 are now in the unlocked state. At this time, the operator can freely rotate the operating component 50, causing the rotating shaft 320 and the valve plate 310 to rotate to the required angle, opening the material channel 110 or controlling its opening size. The material falls from the upper container into the lower container through the gap between the valve plate 310 and the valve seat 10.

[0031] like Figure 4 As shown, Figure 4This is a schematic diagram showing the rotating shaft 320 and the second bushing 220 in a locked state. When the valve plate 310 reaches and stabilizes at the desired specific position (e.g., the material channel 110 is fully closed, fully open, or at a certain degree of opening), to prevent accidental collisions, leaning, or other unintentional actions by personnel from triggering the operating component 50, which could lead to an unexpected change in the state of the valve plate 310 and thus the state of the material channel 110, the operator moves the operating component 50 along the axial direction of the rotating shaft 320 toward the direction closer to the second bushing 220. This causes the first positioning member 610 to engage with the second positioning member 620, locking the operating component 50 and the second bushing 220 in the circumferential direction of the rotating shaft 320. The operating component 50, the rotating shaft 320, and the valve plate 310 cannot rotate again, and the rotating shaft 320 and the second bushing 220 are locked together to prevent accidental operation.

[0032] The shaft 320 can only be rotated by first moving the operating component 50 axially along the rotating shaft 320 to unlock it. After the operation, the operating component 50 must be moved circumferentially along the rotating shaft 320 again to reset and lock it, thus locking the operating component 50 and the second bushing 220, that is, locking the rotating shaft 320 and the second bushing 220. This ensures that a simple external force impact or accidental contact with the operating component 50 cannot directly cause the valve plate 30 to rotate, avoiding accidental closure of the material channel 110 in the working state, accidental opening of the material channel 110 in the closed state, or changes in the opening degree of the material channel 110. It also prevents the operating component 50 from malfunctioning and causing the rotating shaft 320 and valve plate 310 to rotate erroneously, accurately controlling the state of the material channel 110 and ensuring the normal operation of material conveying.

[0033] The valve seat 10 adopts a split design, which is simple and reliable in structure, easy to disassemble and assemble, easy to thoroughly clean and sterilize, and easy to maintain. The first valve seat 130 and the second valve seat 140 are fixedly connected, for example, by bolts. The first positioning element 610 is, for example, a positioning groove, and correspondingly, the second positioning element 620 is, for example, a positioning protrusion; similarly, the first positioning element 610 can also be, for example, a positioning protrusion, and the second positioning element 620 can be, for example, a positioning groove.

[0034] See Figure 4 and Figure 6 In some embodiments, the operating component 50 includes a butterfly valve switch 510 and a locking element 520. Both the butterfly valve switch 510 and the locking element 520 are sleeved on the rotating shaft 320. One end of the butterfly valve switch 510 is provided with a second positioning element 620, and the other end of the butterfly valve switch 510 is provided with a receiving groove 511 that can accommodate the locking element 520. The end of the rotating shaft 320 away from the first bushing 210 passes through the butterfly valve switch 510 and is located inside the locking element 520. The locking element 520 can move along the axial direction of the rotating shaft 320 to lock or unlock the butterfly valve switch 510.

[0035] When it is necessary to change the state of the material channel 110, the operator first pulls the locking member 520 away from the second bushing 220 along the axial direction of the rotating shaft 320 to unlock the butterfly valve switch 510, giving the butterfly valve switch 510 sufficient axial movement space. Then, the operator can pull the butterfly valve switch 510 away from the second bushing 220 along the axial direction of the rotating shaft 320, causing the second positioning member 620 on the butterfly valve switch 510 to disengage from the first positioning member 610 on the second bushing 220. Finally, the operator rotates the butterfly valve switch 510 to drive the rotating shaft 320 to rotate, thereby rotating the valve plate 310 and changing the state of the material channel 110.

[0036] When the valve plate 310 reaches and stabilizes in the desired specific position, the operator moves the butterfly valve switch 510 along the axial direction of the rotating shaft 320 toward the direction closer to the second bushing 220, so that the first positioning member 610 engages with the second positioning member 620, locking the butterfly valve switch 510 in the circumferential direction of the rotating shaft 320; then the locking member 520 is moved along the axial direction of the rotating shaft 320 toward the direction closer to the second bushing 220, locking the butterfly valve switch 510 in the axial direction of the rotating shaft 320, preventing the butterfly valve switch 510 from moving further along the axial direction of the rotating shaft 320, preventing the butterfly valve switch 510 from changing the position of the valve plate 310 due to accidental movement, thus changing the state of the material channel 110, further reducing the possibility of misoperation of the operating component 50, and ensuring the normal conveying of powder.

[0037] Furthermore, the outer wall of the butterfly valve switch 510 is also provided with an operating lever 512, which makes it convenient for the operator to hold and rotate the butterfly valve switch 510 to drive the rotating shaft 320 to rotate.

[0038] See Figure 2 , Figure 7 and Figure 8In some embodiments, the first positioning element 610 includes a first closed positioning element and a plurality of first open positioning elements, which are distributed circumferentially along the second bushing 220. When the second positioning element 620 engages with the first closed positioning element, the valve plate 310 is perpendicular to the axial direction of the valve seat 10 to close the material channel 110, ensuring that the material channel 110 is completely closed. The first closed positioning element is a key locking point to prevent the material channel 110 from being accidentally opened. When the second positioning element 620 engages with any one of the plurality of first open positioning elements, the valve plate 310 opens the material channel 110. The plurality of first open positioning elements can correspond to different angles of the valve plate 310 (e.g., 30°, 60°, 90°, etc.). By engaging the second positioning element 620 with different first open positioning elements, accurate adjustment of the powder flow rate can be achieved. When the valve plate 310 is required to be at a specific angle to control the powder flow rate, the operator can, after unlocking, rotate the operating component 50 to drive the valve plate 310 to rotate to the target angle via the rotating shaft 320. This causes the second positioning element to engage with the first open positioning element corresponding to that specific angle, achieving mechanical positioning and realizing stable and precise control of the powder flow rate. The first open positioning element and multiple first closed positioning elements are, for example, positioning grooves, and the second positioning element is, for example, a positioning protrusion that matches the positioning groove.

[0039] By using different first opening positioning elements and first closing positioning elements, which correspond to different preset angles of valve plate 310, accurate operational feedback can be given to the operator, allowing the operator to adjust the position of valve plate 310 according to the size of the material channel 110 as needed. It can also accurately reflect which preset angle the valve plate 310 is currently locked at, and determine the current state of the material channel 110.

[0040] Furthermore, the first closing positioning element and a plurality of first opening positioning elements are distributed, for example, on half of the circumferential direction of the second bushing 220, so that the rotating shaft 320 can rotate from 0 to 90°.

[0041] See Figure 7 In some embodiments, when the valve plate 310 is axially perpendicular to the valve seat 10, a gap exists between the edge of the valve plate 310 and the inner wall of the valve seat 10. This device is used for conveying powdered materials, which have poorer flowability than liquids or gases. By precisely calculating the gap between the edge of the valve plate 310 and the inner wall of the valve seat 10, leakage of the powder can be prevented to the greatest extent when the valve plate 310 is axially perpendicular to the valve seat 10, thus meeting the basic requirements for airtightness in aseptic production. Furthermore, during rotation, the edge of the valve plate 310 will not repeatedly rub against the inner wall of the valve seat 10, avoiding the generation of wear particles and ensuring the quality of the powder.

[0042] See Figure 4 , Figure 5 , Figure 6 and Figure 7 In some embodiments, a locking element 70 is also included, such as a resilient pin or screw. One end of the locking element 70 passes through the operating component 50 and abuts against the rotating shaft 320 to lock the operating component 50 and the rotating shaft 320, thereby restricting the movement of the operating component 50 in the circumferential direction of the rotating shaft 320. When the locking element 70 abuts against the rotating shaft 320, the radial preload generated securely locks the operating component 50 and the rotating shaft 320 together in the circumferential direction through friction, forming a unified whole capable of transmitting torque. By providing mechanical contact with the rotating shaft 320 through the locking element 70, the potential for clearance or slippage between the operating component 50 and the rotating shaft 320 is completely eliminated, ensuring the reliability of torque transmission and avoiding adjustment errors caused by idle travel.

[0043] Furthermore, when the locking element 70 is a screw, the operator needs to unscrew the locking element 70 so that its end is no longer tightly abutting against the rotating shaft 320, thus releasing the circumferential constraint of the butterfly valve switch 510. This allows the butterfly valve switch 510 to move axially along the second bushing 220, causing the second positioning element 620 to disengage from the first positioning element 610 on the second bushing 220. The operator then screws the locking element 70 back in, so that it abuts against the rotating shaft 320 to lock the operating component 50 and the rotating shaft 320, ensuring that when the operating component 50 rotates, it can drive the rotating shaft 320 to rotate without any free travel. Note that when unscrewing the locking element 70, only the end of the locking element 70 needs to be released from its abutment against the rotating shaft 320; it is not necessary to completely unscrew the locking element 70 from the butterfly valve switch 510 and separate it from the butterfly valve switch 510.

[0044] To reduce operation steps and time, and to avoid the screwing in and out of the locking element 70, the locking element 70 is preferably a resilient pin. In its natural state, the spherical end of the resilient pin is kept extended and pressed against the rotating shaft 320 under the action of the spring, achieving circumferential locking of the operating component 50 on the rotating shaft 320. When it is necessary to change the state of the material channel 110, the butterfly valve switch 510 can be pulled directly away from the second bushing 220. The end of the resilient pin retracts until the butterfly valve switch 510 is pulled until the first positioning element 610 disengages from the second positioning element 620 and no longer moves. Then, the end of the resilient pin continues to extend and press against the rotating shaft 320, locking the butterfly valve switch 510 and the rotating shaft 320 together, so that the butterfly valve switch 510 and the rotating shaft 320 rotate together.

[0045] See Figure 5 , Figure 6 , Figure 7 and Figure 8In some embodiments, the second bushing 220 includes a first sub-shoulder bushing 221 and a second sub-shoulder bushing 222. The first sub-shoulder bushing 221 is located on the side of the second sub-shoulder bushing 222 closer to the valve plate 310, and the first positioning member 610 is disposed on the side of the second sub-shoulder bushing 222 closer to the operating component 50. The first sub-shoulder bushing 221 and the second sub-shoulder bushing 222 are made of different materials. The first sub-shoulder bushing 221 is, for example, a plastic bushing, and the second sub-shoulder bushing 222 is, for example, a metal bushing. The first bushing 210 is also, for example, a plastic bushing. The first sub-shoulder bushing 221 and the first bushing 210 are disposed close to the material channel 110. The friction between the plastic bushing and the rotating shaft 320 can reduce the generation of particles and eliminate the risk of introducing particulate contamination into the powder at the bearing location. The second sub-shoulder bushing 222 is a metal bushing, which can provide a base for the first positioning member 610 and is not easily deformed.

[0046] Furthermore, directional markings 230 are provided on one side of the first bushing 210, the first sub-shoulder bushing 221, and the second sub-shoulder bushing 222. When the directional markings 230 on the first bushing 210, the first sub-shoulder bushing 221, and the second sub-shoulder bushing 222 are aligned in a straight line, it indicates that the first bushing 210, the first sub-shoulder bushing 221, and the second sub-shoulder bushing 222 are installed correctly; otherwise, they need to be reinstalled. The directional marking 230 is, for example, a straight line segment.

[0047] See Figure 4 , Figure 5 , Figure 6 and Figure 8 In some embodiments, a sealing ring 80 is also included, such as an O-ring. The sealing ring 80 is installed between the rotating shaft 320 and the first bushing 210, and between the rotating shaft 320 and the first sub-shoulder bushing 221, and is arranged around the rotating shaft 320. The sealing ring 80 prevents powder particles from entering the gaps between the rotating shaft 320 and the first bushing 210, and between the rotating shaft 320 and the first sub-shoulder bushing 221, thus avoiding jamming that could affect the normal rotation of the rotating shaft 320, which in turn would affect the normal rotation of the valve plate 310 and prevent it from changing the state of the material channel 110. The sealing ring 80 also prevents external contaminants such as microorganisms, dust particles, and moisture from entering the valve seat 10 through the gaps between the rotating shaft 320 and the first bushing 210, and between the rotating shaft 320 and the first sub-shoulder bushing 221, ensuring the sterile state of the powder material transport and preventing contamination.

[0048] See Figure 9In some embodiments, one of the first valve seat 130 and the second valve seat 140 is provided with a sealing groove 151, and the other is provided with a sealing protrusion 152 that matches the sealing groove 151. The sealing groove 151 is located within the sealing protrusion 152. When the sealing protrusion 152 is pressed into the sealing groove 151, radial sealing of the valve seat 10 can be achieved, effectively preventing the powder in the material channel 110 from leaking outwards, and preventing contaminants from the external environment from entering inwards. The cross-section of the sealing protrusion 152 can be rectangular, trapezoidal, etc.

[0049] See Figure 8 In some embodiments, the first valve seat 130 is provided with a plurality of first mounting grooves 131, and the second valve seat 140 is provided with a plurality of second mounting grooves 141. The plurality of first mounting grooves 131 and the plurality of second mounting grooves 141 correspond one-to-one, and together they enclose a bushing mounting space. The first bushing 210 and the second bushing 220 are respectively located within the plurality of bushing mounting spaces to restrict the movement of the first bushing 210 and the second bushing 220 in the axial direction of the rotating shaft 320, ensuring that the positions of the first bushing 210 and the second bushing 220 are reliably fixed. The bushing mounting space formed by the first mounting grooves 131 and the second mounting grooves 141 matches the shape of the first bushing 210 and the second bushing 220, realizing a foolproof bushing design and preventing incorrect bushing installation.

[0050] See Figure 2 In some embodiments, a connecting clamp 90 is provided on the valve seat 10, which can lock the valve seat 10 onto the powder bucket.

[0051] See Figure 10 and Figure 11 Another embodiment of the present invention provides a method for processing a butterfly valve plate, comprising: Step 1: Cutting to obtain a sheet material. The sheet material includes a circular portion and two square portions symmetrically arranged on both sides of the circular portion. The thickness of the sheet material is greater than the diameter of the rotating shaft of the valve plate 30 to be processed. Specifically, the shape can be cut using methods such as plasma cutting or laser cutting to reduce the risk of deformation during cutting. Note that process clamping positions should be reserved on the square portions for convenient subsequent clamping. The material of the sheet material is, for example, S31603.

[0052] Step 2, the first CNC milling process, to machine the valve plate 310 and the rotating shaft 320 connected to the center of the valve plate 310. Specifically, the valve plate 310 and the rotating shaft 320 are machined to a thickness of 15mm, and a center hole with a depth of 4mm is drilled at both ends of the rotating shaft 320 using a center drill with a diameter of 5mm to facilitate clamping the center hole for subsequent CNC machining.

[0053] Step 3, first count, machining the rotating shaft 320. Specifically, the rotating shaft 320 is rough-machined by clamping the center hole to make its diameter 14.5mm. Note that during this process, the rotation axis of the rotating shaft 320 should be kept concentric with the rotation axis of the valve plate 310.

[0054] Step 4, second CNC milling, to machine the valve plate 310 to the first thickness. The first thickness is, for example, 5.4mm. Specifically, a four-axis CNC milling machine is used to clamp the center hole, and after correction, the middle part of the valve plate 310 is milled to 5.4mm.

[0055] Step 5: A second machining operation is performed to machine the shaft 320 to the set diameter and to machine the connecting parts on the shaft 320. Specifically, the set diameter is, for example, 11.5 mm. Both ends of the shaft 320 are precision machined in one pass to ensure concentricity. The connecting parts are, for example, the connection between the shaft 320 and the first bushing 210 and the second bushing 220. The set diameter of the shaft 320 is 15 mm.

[0056] Step 6, third CNC milling, to machine the outer periphery of valve plate 310 to a second thickness. Specifically, the second thickness is, for example, 5mm. Using a four-axis CNC milling machine with precise clamping of the center hole, the outer periphery thickness of valve plate 310 is machined to 5mm, ensuring symmetry and surface finish. The width of the outer periphery of valve plate 310 is, for example, 10mm.

[0057] Through the above steps, the symmetry of the rotation axis of the valve plate 310 of the final valve plate 30 is required to be less than or equal to 0.025 nm, and the coaxiality of the rotation axis and the rotating shaft 320 is required to be less than or equal to 0.025 nm. The flatness of the valve plate 310 is less than or equal to 0.03 mm, and the diameter tolerance of the valve plate 310 is controlled within ±0.03 mm.

[0058] Specifically, the sheet metal is rough-machined through a first CNC milling and a first CNC turning. A second CNC milling, a second CNC turning, and a third CNC milling perform semi-finishing and finishing on the rough-machined material, ultimately yielding the valve plate 30. These multiple machining processes disperse machining stress and prevent deformation. Furthermore, these steps ensure that the valve plate 310 and the rotating shaft 320 are integrated into a single design, avoiding assembly or welding defects. The valve plate 310 and the rotating shaft 320 are less prone to deformation during use, guaranteeing the coaxiality of the rotation center of the valve plate 310 with the rotating shaft. This allows for more flexible integrated rotation of the valve plate 310 and the rotating shaft 320, and prevents the rotating shaft 320 from being too tight or too loose with the first bushing 210 and the second bushing 220, thus avoiding the generation of foreign matter that contaminates the powder due to friction and compression between the rotating shaft 320 and the first bushing 210 and the second bushing 220.

[0059] Between step 1 and step 2, annealing is also included, in which the plate is held at 400℃ for 3 hours to perform stress-relief annealing, which eliminates the stress in the plate and prevents deformation caused by the release of internal stress during subsequent finishing.

[0060] Between steps 4 and 5, there is also an initial mirror polishing. Note that only the valve plate 310 needs to be polished, and the rotating shaft 320 does not need to be polished, in preparation for the final finishing and nano-polishing.

[0061] Following step 6, the following is also included: Step 7, wire cutting, removing excess material. Specifically, use wire cutting, based on the machined surface, to remove the initially reserved process clamping position and center hole.

[0062] Step 8, Nanopolishing: Perform nano-level polishing on the valve plate 310 and the rotating shaft 320. Ensure that the surface roughness Ra of the valve plate 310 and the rotating shaft 320 is less than or equal to 0.4μm, achieving a mirror finish, and without causing workpiece deformation as easily as manual polishing. The mirror finish of the valve plate 310 effectively prevents powder adhesion, and the mirror finish of the rotating shaft 320 ensures more flexible and effortless rotation.

[0063] Step 9, passivation, involves passivating the surfaces of the valve plate 310 and the rotating shaft 320. Specifically, this process forms a dense and stable passivation film on the surface, improving corrosion resistance while making the surface smoother, flatter, and brighter, resulting in high surface cleanliness and no harmful residues.

[0064] The valve plate 30 obtained through the above steps, with its valve disc 310 processed with high precision, ensures a tight fit between the valve disc 310 and the valve seat 10, resulting in good powder sealing. Furthermore, the high coaxiality between the valve disc 310 and the rotating shaft 320 ensures flexible rotation. Nano-polishing and passivation treatments meet aseptic requirements, making it easy to clean, corrosion-resistant, and free of powder adhesion. High-temperature moist heat sterilization ensures the valve plate 30 has high mechanical strength, is not easily deformed, and extends its service life.

[0065] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0066] Furthermore, it is understood that the foregoing embodiments are merely illustrative examples of the present invention. Provided that the technical features do not conflict, the structure is not contradictory, and the purpose of the present invention is not violated, the technical solutions of the various embodiments can be arbitrarily combined and used.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; 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; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A manual butterfly valve for aseptic powder transfer, characterized in that, include: A valve seat forms an axially penetrating material channel; the valve seat includes a first valve seat and a second valve seat connected to the first valve seat, the first valve seat and the second valve seat together forming the material channel; The bushing assembly includes a first bushing and a second bushing, both of which are disposed between a first valve seat and a second valve seat and are radially opposite to each other along the valve seats. A valve plate includes a valve disc and a rotating shaft. The valve disc is located in the material channel of the valve seat. The rotating shaft is connected to the valve disc and extends out of the valve disc at both ends, passing through the first bushing and the second bushing respectively. The rotating shaft is rotatably connected to the first bushing and the second bushing. An operating component is connected to one end of the rotating shaft near the second bushing; Wherein, a first positioning element is provided at one end of the second bushing near the operating component, and a second positioning element matching the first positioning element is provided on one side of the operating component near the second bushing. The operating component can move along the axial direction of the rotating shaft to make the second positioning element engage or disengage from the first positioning element, so that the rotating shaft is locked or unlocked in the second bushing.

2. The manual butterfly valve as described in claim 1, characterized in that, The operating components include a butterfly valve switch and a locking element. Both the butterfly valve switch and the locking element are sleeved on the rotating shaft. One end of the butterfly valve switch is provided with a second positioning element, and the other end of the butterfly valve switch is provided with a receiving groove that can accommodate the locking element. The end of the rotating shaft away from the first bushing passes through the butterfly valve switch and is located inside the locking element. The locking element can move along the axial direction of the rotating shaft to lock or unlock the butterfly valve switch.

3. The manual butterfly valve as described in claim 1, characterized in that, The first positioning element includes a first closed positioning element and a plurality of first open positioning elements, which are distributed circumferentially along the second bushing. When the second positioning element engages with the first closed positioning element, the valve plate is perpendicular to the axial direction of the valve seat to close the material channel. When the second positioning element engages with any one of the plurality of first open positioning elements, the valve plate opens the material channel.

4. The manual butterfly valve as described in claim 1, characterized in that, When the valve plate is perpendicular to the axial direction of the valve seat, there is a gap between the edge of the valve plate and the inner wall of the valve seat.

5. The manual butterfly valve as described in claim 1, characterized in that, It also includes a locking element, one end of which passes through the operating component and abuts against the rotating shaft to lock the operating component and the rotating shaft, thereby restricting the movement of the operating component in the circumferential direction of the rotating shaft.

6. The manual butterfly valve as described in claim 1, characterized in that, The second bushing includes a first sub-shoulder and a second sub-shoulder. The first sub-shoulder is located on the side of the second sub-shoulder closer to the valve plate. The first positioning member is disposed on the side of the second sub-shoulder closer to the operating component. The first sub-shoulder and the second sub-shoulder are made of different materials.

7. The manual butterfly valve as described in claim 6, characterized in that, It also includes a sealing ring, which is installed between the rotating shaft and the first bushing, and between the rotating shaft and the first sub-shoulder, and the sealing ring is arranged around the rotating shaft.

8. The manual butterfly valve as described in claim 1, characterized in that, One of the first valve seat and the second valve seat is provided with a sealing groove, and the other valve seat is provided with a sealing protrusion that matches the sealing groove, wherein the sealing groove is located within the sealing protrusion.

9. The manual butterfly valve as described in claim 8, characterized in that, The first valve seat is provided with a plurality of first mounting slots, and the second valve seat is provided with a plurality of second mounting slots. The plurality of first mounting slots correspond one-to-one with the plurality of second mounting slots. The plurality of first mounting slots and the corresponding second mounting slots together enclose a bushing mounting space. The first bushing and the second bushing are respectively located within the plurality of bushing mounting spaces to restrict the movement of the first bushing and the second bushing in the axial direction of the rotating shaft.

10. A method for processing a valve plate according to claims 1-9, characterized in that, include: Cutting to obtain a plate, the plate comprising a circular portion and two square portions symmetrically arranged on both sides of the circular portion, the thickness of the plate being greater than the diameter of the rotating shaft of the valve plate to be processed; The first CNC milling operation produces the valve plate and the rotating shaft connected to the center of the valve plate. The first batch of machining operations is performed on the rotating shaft. The valve plate is machined to the first thickness in the second milling process; In the second machining process, the shaft is machined to a set diameter, and the connecting parts on the shaft are machined. The third milling operation processes the outer periphery of the valve plate to a second thickness.

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