A clamping tool for valve production

Abstract

The application provides a clamping tool for valve production, relates to the technical field of valve clamping, and comprises a fixing frame and a base. The fixing frame is clamped by a chuck, and a pressing plate is arranged above the valve core on the base. The two sides of the pressing plate are connected with the base through connecting bolts. A locking piece is slidably arranged on the connecting bolts, the locking piece is rotationally connected with the pressing plate, a return spring one is connected between the locking piece and the connecting bolt, a connecting nut is arranged above the locking piece on the connecting bolt. Locking bolts are arranged in two control shaft holes of the valve core. The two ends of the locking bolts are respectively connected with a first fixing piece and a second fixing piece. The first fixing piece and the second fixing piece are connected with the pressing plate through locking screws. In the machining process of the valve core, the process switching is realized only by the rotation of the base and the overturning of the pressing plate, and the valve core does not need to be disassembled and assembled for many times. The positioning error caused by repeated clamping is reduced, the clamping time is saved, and the machining efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valve clamping, in particular to a clamping tool for valve production. BACKGROUND

[0002] Valves are control components in fluid conveying systems, with functions such as shut-off, regulation, flow guidance, anti-backflow, pressure stabilization, flow splitting, and overflow pressure relief. In production engineering, valves generally need to be machined after casting or forging, such as turning, boring, and slotting, according to the shape, size, and precision requirements of valve parts.

[0003] A semi-spherical valve is a valve developed to solve the problem of conveying two-phase mixed media. The valve core is semi-spherical, and the flow passage is designed uniquely. When opened, the ball completely separates from the valve seat, forming a straight-through flow passage, reducing fluid resistance, and avoiding blockage. The valve stem rotates to drive the semi-spherical body to eccentrically rotate, the ball quickly separates from the valve seat, the flow passage is completely unobstructed, and the fluid resistance is reduced to a minimum. The valve stem is reversed, the semi-spherical body gradually approaches the valve seat, and the eccentric structure is used to achieve tighter sealing, ultimately achieving zero leakage. The positions of the valve core processing include turning the control shaft hole, the end face of the control shaft hole, and turning the annular spherical surface.

[0004] For example, the patent document with publication number CN209774063U discloses a special clamp for valve production. The clamp includes a base and two straight plates, and first and second clamping plates are installed on the two straight plates, respectively. A sliding mechanism is provided on the first clamping plate, and the sliding mechanism is connected to an electric telescopic column. The height of the electric telescopic column can be adjusted through the sliding mechanism. A rotating mechanism is provided on the second clamping plate, and the rotating mechanism is connected to a four-jaw chuck. The rotating mechanism can drive the four-jaw chuck to rotate. The electric telescopic column and the four-jaw chuck cooperate with each other to clamp the valve core. The four-jaw chuck can clamp valves with smaller diameters in a horizontal state, and can clamp valves with larger diameters in a vertical state.

[0005] When the above-mentioned clamp clamps the valve core of the semi-spherical valve, the valve core of the semi-spherical valve has a special shape with one side being a spherical end face and the other side being a connecting plane. After machining the end face of the control shaft hole, the valve core needs to be re-clamped and positioned when machining the annular spherical surface. In this process, the valve core needs to be disassembled and re-clamped, which affects the machining precision and efficiency. SUMMARY

[0006] Therefore, the present application provides a clamping tool for valve production, which solves the technical problem that the existing clamping tool needs to be clamped multiple times when clamping the valve core of the semi-spherical valve, affecting the machining precision and efficiency.

[0007] To solve the above technical problems, the application provides a clamping tool for valve production, which comprises a fixing frame and a base rotatably installed on the fixing frame, the fixing frame is clamped by a chuck, the base is used for placing a valve core, and a pressing plate is arranged above the valve core on the base; the two sides of the pressing plate are connected with the base through connecting bolts, a locking piece is slidably installed on the connecting bolts, the locking piece is rotatably connected with the pressing plate, a reset spring I is connected between the locking piece and the connecting bolt, and a connecting nut is arranged above the locking piece on the connecting bolt.

[0008] Locking bolts are installed in the two control shaft holes of the valve core, the two ends of the locking bolts are respectively connected with a first fixing piece and a second fixing piece, the first fixing piece and the second fixing piece are both L-shaped, and the first fixing piece and the second fixing piece are connected with the pressing plate through locking screws.

[0009] By adopting the above technical scheme, the chuck clamps the fixing frame, the valve core of the semi-spherical valve to be machined is placed on the base, the bottom surface of the valve core is attached to the base, the end surface of one control shaft hole faces the tool of the machine tool, the pressing plate is installed above the valve core and can abut against the valve core, the locking piece is rotatably connected with the pressing plate, the connecting nut is tightened, the locking piece and the pressing plate press the valve core tightly, and the tool machines the control shaft hole and the end surface of the control shaft hole. After the end surface of the control shaft hole is machined, the base is rotated by 180°, so that the end surface of the other control shaft hole faces the tool of the machine tool, and the tool machines the control shaft hole and the end surface of the control shaft hole.

[0010] Then the locking bolts are inserted into the two control shaft holes, the first fixing piece and the second fixing piece are installed on the locking bolts, the locking screws are tightened, the first fixing piece and the second fixing piece are fixed with the pressing plate, the connecting nut is loosened, the locking piece and the pressing plate are moved upward, the valve core is moved upward synchronously, the bottom surface of the valve core is at a certain height from the base, the pressing plate and the valve core are turned over by 90°, so that the annular spherical surface of the valve core faces the tool, then the connecting nut is tightened to fix the pressing plate and the valve core, and the tool machines the annular spherical surface.

[0011] The bottom surface of the valve core attached to the base serves as an initial positioning reference, when the end surface of the control shaft hole is machined, the tool takes the reference surface as a reference to ensure the perpendicularity of the control shaft hole and the bottom surface; when the other end control shaft hole is machined by rotating the base by 180°, the bottom surface is still taken as a reference to ensure the coaxiality of the two control shaft holes. When the annular spherical surface is machined, the control shaft hole is taken as a positioning reference for subsequent clamping, and the accuracy directly affects the turning positioning accuracy when the annular spherical surface is machined. The machining of the control shaft hole and the end surface of the control shaft hole is completed first, and then the radial spherical surface is machined, which is beneficial to reducing the positioning error when the annular spherical surface is machined and improving the positioning accuracy.

[0012] In the process of machining the end faces of the control shaft holes at both ends and the annular spherical surface, the valve core of the present invention achieves process switching only by rotating the base and flipping the pressure plate, realizing efficient connection of processes. It eliminates the need for multiple disassembly and assembly of the valve core, avoids positioning errors caused by repeated clamping, reduces clamping time, and improves machining efficiency. It is suitable for the fine machining needs of complex curved surface parts in mass production.

[0013] Preferably, the fixing member has a positioning shaft at the end away from the locking screw, and the base has a positioning hole that matches the end of the positioning shaft.

[0014] By adopting the above technical solution, after the end faces of the two control shaft holes of the valve core are machined, fixing parts one and two are fixed to the connecting bolts and pressure plate. Loosening the connecting nut, moving the pressure plate and valve core upwards, and then rotating the pressure plate and valve core 90° so that the annular spherical surface of the valve core faces the cutting tool, fixing part one faces downwards, and the positioning shaft is inserted into the positioning hole, thus achieving the positioning of the fixing shaft and forming a shaft-hole mating positioning. This restricts the horizontal displacement of fixing part one, which helps improve positioning accuracy. During the machining of the annular spherical surface of the valve core, the cutting force of the cutting tool is radially distributed. After the positioning shaft is inserted into the positioning hole, a rigid connection is formed, which helps reduce surface vibration marks caused by insufficient clamping rigidity of the valve core.

[0015] Preferably, the middle part of the base is provided with a mounting groove for installing the valve core, and a positioning groove is provided in the mounting groove to position the fixing part. The positioning hole is provided in the positioning groove and is located in the middle part of the mounting groove.

[0016] By adopting the above technical solution, the pressure plate and valve core are rotated 90° so that the annular spherical surface of the valve core faces the cutter. At this time, the first fixing component faces downward and is inserted into the positioning groove, while the positioning shaft is inserted into the positioning hole. The mounting groove in the middle of the base is designed according to the shape of the bottom surface of the valve core. The groove depth and width ensure that the bottom surface of the valve core is completely fitted, restricting the horizontal displacement of the valve core. The positioning groove is opened in the mounting groove, and its shape matches the cross-section of the first fixing component, which can restrict the horizontal offset of the first fixing component. When the positioning shaft of the first fixing component is inserted into the positioning hole, the groove wall of the positioning groove fits against the side of the first fixing component, forming a dual positioning of "surface contact + shaft hole fit". Compared with simple shaft hole positioning, it can reduce the rotational freedom of the first fixing component and further improve the positioning accuracy.

[0017] When the cutting tool cuts the annular spherical surface of the valve core, the cutting force is transmitted to the base through the pressure plate and the first fixing component. The bottom of the positioning groove fits against the bottom surface of the first fixing component, which can withstand the cutting force in the vertical direction, while the fit between the positioning hole and the positioning shaft can withstand the cutting force in the horizontal direction. The two form a rigid support structure of "surface + point", which helps to reduce the deformation of the first fixing component, thereby helping to reduce the phenomenon of spherical machining vibration caused by insufficient clamping rigidity.

[0018] Preferably, the base plate is a racetrack shape with two straight edges and two curved edges. A positioning block is rotatably connected to the fixing frame. The positioning block is connected to the fixing frame by fixing bolts. The end of the positioning block can abut against the straight edge of the base, and the edge of the fixing frame can be parallel to the straight edge of the base.

[0019] By adopting the above technical solution, the two straight edges of the runway-shaped base form two parallel and equal-length rigid reference surfaces. After the base is rotated into position, that is, the edge of the fixing frame is parallel to the straight edge of the base, the positioning block is rotated so that the end of the positioning block abuts against the straight edge of the base, and then the fixing nut on the fixing bolt is tightened to position the base.

[0020] Preferably, the base has a rotating shaft at its bottom, and the bottom of the mounting bracket has a mounting hole that rotatably engages with the rotating shaft.

[0021] By adopting the above technical solution, the two control shaft holes of the hemispherical valve core are usually symmetrically distributed. The rotating shaft can cause the base to drive the valve core to rotate 180°, turning the control shaft hole at the other end toward the tool. There is no need to re-clamp, which helps to reduce positioning errors caused by repeated clamping, thereby improving machining accuracy and efficiency.

[0022] Preferably, the fixed frame is rotatably connected to the edge of the base, the lower end face of the fixed frame can abut against the upper end face of the base, the fixed frame is connected to the fixed frame by a limiting bolt, and a return spring is connected between the fixed frame and the fixed frame.

[0023] By adopting the above technical solution, after the base is rotated into position, that is, the edge of the fixing frame is parallel to the straight edge of the base, the positioning block is rotated so that the end of the positioning block abuts against the straight edge of the base. Then, the fixing nut on the fixing bolt is tightened to position the base. Next, the limiting nut on the limiting bolt is tightened to move the limiting part down until the lower end face of the limiting part abuts against the upper end face of the base, thus fixing the base.

[0024] Preferably, the pressure plate is provided with a wedge-shaped groove, and both the first and second fixing parts are provided with wedge-shaped blocks that match the wedge-shaped groove. The ends of the wedge blocks and the locking screws are rotatably connected, and the locking screws are threadedly connected to the first and second fixing parts.

[0025] By adopting the above technical solution, when fixing parts one and two are fixed to the pressure plate, tightening the locking screw causes the locking screw to move the wedge block downwards. The inclined surface of the wedge block engages with the inclined surface of the wedge groove, pressing the pressure plate tightly. When the inclined surface of the wedge block engages with the wedge groove, a large lateral clamping force can be generated with a relatively small tightening force of the locking screw.

[0026] The matching design of the wedge block and wedge groove can guide the relative position of the fixing part one, the fixing part two and the pressure plate. During installation, simply embed the wedge block into the groove and tighten the locking screw to complete the positioning and clamping, reducing the alignment time.

[0027] The self-locking action of the wedge block can resist external interference such as vibration, impact, and thermal deformation. When machining the valve core, the cutting force may cause the bolts of traditional fixtures to loosen, but the wedge-shaped self-locking structure helps to reliably clamp the valve core during the machining process.

[0028] Preferably, the pressure plate has lock holes on both sides, and the locking component includes a lock rod inserted into the lock hole and a locking plate connected to the lock rod, with the locking plate slidably connected to the connecting bolt.

[0029] By adopting the above technical solution, the locking rod is inserted into the lock hole. When machining the end face of the control shaft hole of the valve core, the connecting nut is tightened, and the connecting nut presses the locking plate, so that the lower edge of the locking rod presses against the lock hole, thereby fixing the pressure plate. After the end face of the control shaft hole is machined, the connecting nut is loosened. Under the elastic force of the return spring, the locking plate moves up, and the locking rod can be located in the middle of the lock hole, allowing relative rotation between the pressure plate and the locking rod. This facilitates the flipping of the pressure plate and the valve core. After the pressure plate and the valve core are flipped, the connecting nut is tightened, causing the locking plate to move down. The lower edge of the locking rod presses against the lock hole again, thereby fixing the pressure plate. Since the pressure plate and the fixing part are connected, it is beneficial to achieve a tight fit between the fixing part and the positioning groove, thereby improving the positioning accuracy.

[0030] Preferably, one side of the fixing frame is provided with a connection hole for connecting the chuck claw, and the connection hole is provided with multiple slots that match the chuck claw.

[0031] By adopting the above technical solution, the chuck's jaws extend into the connecting hole. As the jaws move, they engage with the slot. The slot restricts the jaws' radial movement within the connecting hole, which helps improve the jaws' gripping stability. At the same time, the slot serves as a guide structure when the jaws are inserted, reducing alignment time during assembly.

[0032] Preferably, the mounting bracket is provided with a locking frame for locking the mounting bracket and a claw, the locking frame extending through the mounting bracket, and a limit screw connected to the lower part of the locking frame.

[0033] By adopting the above technical solution, the locking frame surrounds the outer side of the chuck, forming a locking effect with the fixing frame. When the limit screw is rotated, because the limit screw and the locking frame are connected by threads, the locking frame moves down and squeezes the chuck, making the chuck fit tightly with the connection hole of the fixing frame, which helps to increase the firmness of the connection between the chuck and the fixing frame.

[0034] The beneficial effects of the above-described technical solution of the present invention are as follows:

[0035] 1. In this invention, the bottom surface of the valve core fits against the base as the initial positioning reference. When machining the end face of the control shaft hole, the tool uses this reference surface as a reference. When machining the control shaft hole at the other end by rotating the base 180°, the bottom surface is still used as the reference to ensure the coaxiality of the shaft holes at both ends. When machining the annular spherical surface, the pressure plate and valve core are rotated 90°, and the control shaft hole is used as the positioning reference for subsequent clamping. The process switching is achieved only by rotating the base and rotating the pressure plate, which realizes efficient connection of processes. There is no need to disassemble and assemble the valve core multiple times, avoiding positioning errors caused by repeated clamping, which is conducive to improving machining accuracy, while reducing clamping time and improving machining efficiency.

[0036] 2. The base of the present invention is provided with an installation groove, a positioning groove and a positioning hole. The installation groove positions the valve core and restricts the displacement of the valve core in the horizontal direction. The positioning groove positions the fixing member one and the positioning hole positions the positioning shaft on the fixing member one. When the positioning shaft of the fixing member one is inserted into the positioning hole, the groove wall of the positioning groove fits against the side of the fixing member one, forming a dual positioning of "surface contact + shaft hole fit", which is beneficial to improving the positioning accuracy. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the clamping fixture used in valve production during the machining of the control shaft hole of a valve, according to the present invention, to clamp the valve.

[0038] Figure 2 This is a side view of the clamping fixture used in valve production during the machining of the control shaft hole of a valve, according to the present invention, clamping the valve.

[0039] Figure 3 This is a top view of the clamping fixture used in valve production during the machining of the control shaft hole of the valve, according to the present invention, clamping the valve.

[0040] Figure 4 for Figure 3 Sectional view at point AA;

[0041] Figure 5 This is a schematic diagram of the base of the present invention;

[0042] Figure 6 This is a schematic diagram of the structure of the clamping pressure plate of the first and second fixing members of the present invention;

[0043] Figure 7 This is a cross-sectional view along the axial direction of the locking bolt when the first and second fixing members of the present invention clamp the pressure plate;

[0044] Figure 8 This is a schematic diagram of the clamping fixture used in valve production during the machining of the annular spherical surface of a valve, according to the present invention, for clamping the valve.

[0045] Figure 9This is a top view of the clamping fixture used in valve production during the machining of the annular spherical surface of a valve, according to the present invention, clamping the valve.

[0046] Figure 10 for Figure 9 Sectional view at point BB.

[0047] In the diagram: 1. Fixing frame; 11. Fixing plate one; 111. Connecting hole; 112. Slot; 12. Fixing plate two; 121. Mounting hole; 13. Connecting rod; 14. Locking frame; 15. Limiting screw; 16. Positioning block; 17. Fixing bolt; 18. Limiting component; 19. Limiting bolt; 191. Limiting nut; 192. Return spring two; 2. Base; 21. Rotating shaft; 22. Mounting slot; 23. Connecting bolt ; 231. Return spring one; 232. Connecting nut; 24. Locking component; 241. Locking rod; 242. Locking plate; 25. Positioning groove; 26. Positioning hole; 3. Pressure plate; 31. Pressure head one; 311. Wedge groove; 32. Pressure head two; 33. Locking hole; 4. Locking bolt; 5. Fixing component one; 51. Positioning shaft; 6. Fixing component two; 61. Wedge block; 62. Locking screw; 7. Valve core; 71. Control shaft hole. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will be described in conjunction with the embodiments of the present invention. Figures 1-10 The technical solutions of the embodiments of the present invention will be clearly and completely described.

[0049] Example

[0050] This embodiment provides a clamping fixture for valve production, such as... Figure 1 As shown, the valve core 7 is used to clamp the hemispherical valve. The valve core 7 has two control shaft holes 71, an annular spherical surface and a bottom surface. The bottom surface is a plane. The two control shaft holes 71, the end faces of the two control shaft holes 71 and the annular spherical surface need to be machined.

[0051] like Figure 1 As shown, the clamping fixture for valve production in this embodiment includes a fixed frame 1 and a base 2.

[0052] like Figure 1 As shown, the fixing frame 1 includes a first fixing plate 11 and a second fixing plate 12 connected vertically, and a connecting rod 13 connecting the first fixing plate 11 and the second fixing plate 12. A connecting hole 111 for connecting the jaws of the chuck is provided in the middle of the first fixing plate 11. Three slots 112 for cooperating with the jaws are provided radially within the connecting hole 111. In this embodiment, the chuck is a three-jaw chuck.

[0053] like Figure 1As shown, the jaws of the three-jaw chuck (not shown in the figure) extend into the connecting hole 111. The jaws move radially away from the axis of the chuck and engage with the slot 112 to clamp the fixed frame 1.

[0054] like Figure 1 and Figure 2 As shown, a locking frame 14 is provided on the fixing bracket 1 near the connecting hole 111. The locking frame 14 is a rectangular frame that passes through the fixing plate 12. A limit screw 15 is threadedly connected to the bottom of the locking frame 14.

[0055] like Figure 1 and Figure 2 As shown, one of the claws penetrates the locking frame 14. By rotating the limiting screw 15, since the limiting screw 15 and the locking frame 14 are connected by threads, the locking frame 14 moves down and squeezes the claw, so that the claw fits tightly with the connection hole 111 of the fixing frame 1, which helps to increase the firmness of the connection between the chuck and the fixing frame 1.

[0056] like Figure 1 and Figure 4 As shown, a mounting hole 121 is provided in the middle of the fixing plate 12, and a rotating shaft 21 is provided below the middle of the base 2. The rotating shaft 21 is rotatably connected to the mounting hole 121. The axis of the rotating shaft 21 and the axis of the mounting hole 121 coincide and both extend in the vertical direction. Rotating the rotating shaft 21 can realize the rotation of the base 2. The base 2 is used to support the valve core 7, thereby realizing the rotation of the valve core 7, and the two end faces of the valve core 7 can be machined.

[0057] like Figure 1 and Figure 4 As shown, the middle part of the base 2 is provided with a mounting groove 22. The mounting groove 22 is designed according to the shape of the bottom surface of the valve core 7. The groove depth and groove width can ensure that the bottom surface of the valve core 7 is completely fitted, and restrict the displacement of the valve core 7 in the horizontal direction.

[0058] like Figure 1 and Figure 4 As shown, the bottom surface of the valve core 7 is placed in the mounting groove 22, and the axes of the two control shaft holes 71 of the valve core 7 are parallel to the axis of the connecting hole 111.

[0059] like Figure 1 and Figure 3 As shown, the base 2 has a racetrack shape with two straight edges and two curved edges. A positioning block 16 is rotatably connected to the second fixing plate 12 near the first fixing plate 11. The positioning block 16 is connected to the fixing frame 1 by a fixing bolt 17. A fixing nut (not shown in the figure) is threaded onto the fixing bolt 17.

[0060] like Figure 1 and Figure 3As shown, the end of the positioning block 16 can abut against the straight edge of the base 2, and the edge of the fixing plate 12 can be parallel to the straight edge of the base 2.

[0061] like Figure 1 and Figure 3 As shown, the two straight edges of the base 2 form two parallel and equal-length rigid reference surfaces. After the base 2 is rotated into position, that is, the edge of the fixing plate 12 is parallel to the straight edge of the base 2, rotate the positioning block 16 so that the end of the positioning block 16 abuts against the straight edge of the base 2, and then tighten the fixing nut on the fixing bolt 17 to position the positioning block 16 on the base 2.

[0062] like Figure 1 and Figure 3 As shown, multiple limiting members 18 are rotatably connected to the edge of the base 2 on the fixed frame 1. The limiting members 18 are plate-shaped structures, and their lower end faces can abut against the upper end faces of the base 2. The limiting members 18 and the fixed plate 12 are connected by limiting bolts 19. A limiting nut 191 is threadedly connected to the limiting bolts 19 above the limiting members 18. A return spring 192 is sleeved on the limiting bolts 19, and its two ends are connected to the limiting members 18 and the base 2, respectively.

[0063] like Figure 1 and Figure 3 As shown, after the positioning block 16 positions the base 2, the limiting nut 191 is tightened. The limiting nut 191 presses down on the limiting member 18, so that the lower end face of the limiting member 18 abuts against the upper end face of the base 2, thereby fixing the base 2.

[0064] like Figure 1 As shown, a pressure plate 3 is provided on the base 2 above the valve core 7. The pressure plate 3 is cross-shaped and has two pressure heads 31 and two pressure heads 32. The lower end face of the two pressure heads 31 has an arc surface that abuts against the valve core 7. This arc surface abuts against the part of the valve core 7 located above the control shaft hole 71. The two pressure heads 32 are located on both sides of the pressure heads 31.

[0065] like Figure 1 and Figure 4 As shown, both pressure heads 32 are provided with locking holes 33, and the axis of the locking holes 33 is perpendicular to the axis of the connecting holes 111.

[0066] like Figure 1 and Figure 4 As shown, the base 2 is provided with connecting bolts 23 on both sides of the mounting groove 22. The axes of the two connecting bolts 23 are parallel and both extend in the vertical direction.

[0067] like Figure 1 and Figure 4As shown, the connecting bolt 23 is provided with a locking element 24, which includes a locking rod 241 and a locking plate 242 connected to the locking rod 241.

[0068] like Figure 1 and Figure 4 As shown, the locking plate 242 is slidably connected to the connecting bolt 23. A return spring 231 is sleeved on the connecting bolt 23, and both ends of the return spring 231 are connected to the locking plate 242 and the connecting bolt 23, respectively. The locking rod 241 can be inserted into the lock hole 33. A connecting nut 232 is threadedly connected to the connecting bolt 23 above the locking plate 242.

[0069] like Figure 1 and Figure 4 As shown, the end face of one control shaft hole 71 faces the cutting tool. The locking rod 241 is inserted into the locking hole 33. The connecting nut 232 is tightened, and the connecting nut 232 presses against the locking plate 242, so that the lower edge of the locking rod 241 presses against the locking hole 33, thereby fixing the pressure plate 3. After the cutting tool has finished machining one control shaft hole 71 and its end face, the fixing nut and the limiting nut 191 are loosened, and the base 2 is rotated 180°. The base 2 drives the valve core 7 to rotate 180°, turning the other control shaft hole 71 toward the cutting tool. The positioning block 16 positions the base 2, and the fixing nut and the limiting nut 191 are tightened. The cutting tool then machines the control shaft hole 71 and its end face.

[0070] like Figure 5 and Figure 6 As shown, locking bolts 4 are installed in the two control shaft holes 71 of the valve core 7. The locking bolts 4 pass through the two control shaft holes 71. The two ends of the locking bolts 4 are respectively connected to the first fixing part 5 and the second fixing part 6. Both the first fixing part 5 and the second fixing part 6 are L-shaped.

[0071] like Figure 5 and Figure 6 As shown, both the first fixing part 5 and the second fixing part 6 are connected to the locking bolt 4 by threads, and the locking bolt 4 has two threads with opposite rotation directions. Rotating the locking bolt can bring the first fixing part 5 and the second fixing part 6 closer to each other.

[0072] like Figure 5 and Figure 6 As shown, fixing part 5 and fixing part 6 are respectively installed at the ends of the two pressure heads 31. The upper ends of the two pressure heads 31 are provided with wedge grooves 311. The fixing parts 5 and 6 are provided with wedge blocks 61 that match the wedge grooves 311. The upper end of the wedge block 61 is rotatably connected with a locking screw 62. The locking screw 62 and fixing parts 5 and 6 are threaded. The axis of the locking screw 62 extends in the vertical direction.

[0073] likeFigure 5 and Figure 6 As shown, tightening the locking screw 62 causes the wedge block 61 to move downwards. Since the locking screw 62 is connected to both the first fixing part 5 and the second fixing part 6 by threads, the locking screw 62 engages with the inclined surface of the wedge groove 311, thus pressing the pressure plate 3. When the inclined surface of the wedge block 61 engages with the wedge groove 311, a large lateral clamping force can be generated with a relatively small tightening force of the locking screw 62.

[0074] like Figure 5 and Figure 6 As shown, the fixing member 5 is located near the fixing plate 11. The fixing member 5 has a positioning shaft 51 at the end away from the locking screw 62. The axis of the positioning shaft 51 is perpendicular to the axis of the locking screw 62.

[0075] like Figure 5 and Figure 7 As shown, a positioning groove 25 is provided on the base 2 within the mounting groove 22. A positioning hole 26 is provided within the positioning groove 25 and located in the middle of the mounting groove 22. The shape of the positioning groove 25 matches the cross-section of the fastener 5, which can limit the horizontal displacement of the fastener 5. The positioning hole 26 matches the positioning shaft 51.

[0076] like Figure 6 and Figure 7 As shown, after the end faces of the two control shaft holes 71 of the valve core 7 are machined, the locking bolt 4 is inserted into the two control shaft holes 71. Fixing part 1 5 and fixing part 2 6 are installed on the locking bolt 4. When the locking bolt 4 is rotated, fixing part 1 5 and fixing part 2 6 move closer to each other and clamp the pressure plate 3 and the valve core 7 in the horizontal direction. Tighten the locking screw 62. The locking screw 62 drives the wedge block 61 to move down. The inclined surface of the wedge block 61 cooperates with the inclined surface of the wedge groove 311 to press the pressure plate 3 in the vertical direction.

[0077] like Figure 4 As shown, when the connecting nut 232 is loosened, the locking plate 242 moves upward under the elastic force of the return spring 231, and the locking rod 241 can be located in the middle of the lock hole 33. The locking member 24, the pressure plate 3 and the valve core 7 move upward, so that the bottom surface of the valve core 7 is at a certain height from the base 2.

[0078] like Figures 8-10 As shown, the pressure plate 3 and valve core 7 are rotated 90° so that the annular spherical surface of the valve core 7 faces the tool. At the same time, the fixing part 5 faces downward and is inserted into the positioning groove 25, and the positioning shaft 51 is inserted into the positioning hole 26, forming a dual positioning of "surface contact + shaft hole fit". Compared with simple shaft hole positioning, the rotational freedom of the fixing part 5 can be reduced, and the positioning accuracy can be further improved.

[0079] like Figure 4 and Figure 8As shown, then, tighten the connecting nut 232 to move the locking plate 242 down, and the lower edge of the locking rod 241 presses against the locking hole 33 again to fix the pressure plate 3. Since the pressure plate 3 is connected to the fixing part 5, it is beneficial to achieve a tight fit between the fixing part 5 and the positioning groove 25, thereby improving the positioning accuracy. The tool processes the annular spherical surface of the valve core 7.

[0080] like Figure 8 As shown, in this embodiment, the valve core 7, during the clamping, machining of the control shaft holes 71 at both ends, and flipping to machine the annular spherical surface, achieves process switching only by rotating the base 2 and flipping the pressure plate 3, and completes the efficient connection of each process. There is no need to disassemble and assemble the valve core 7 multiple times, which reduces the workload of disassembly and assembly, avoids positioning errors caused by repeated clamping, and reduces clamping time, improves machining efficiency, and is suitable for the fine machining needs of complex curved surface parts in mass production.

[0081] The implementation principle of a clamping fixture for valve production in this embodiment is as follows:

[0082] Rotate the base 2 so that the straight edge of the base 2 is parallel to the edge of the fixing plate 12. Rotate the positioning block 16 so that the end of the positioning block 16 abuts against the straight edge of the base 2. Then tighten the fixing nut on the fixing bolt 17 so that the positioning block 16 positions the base 2. Tighten the limiting nut 191 so that the limiting nut 191 presses down on the limiting member 18 so that the lower end face of the limiting member 18 abuts against the upper end face of the base 2, thereby fixing the base 2.

[0083] The valve core 7 is installed on the base 2, with the bottom surface of the valve core 7 placed in the mounting groove 22. The pressure plate 3 is installed above the valve core 7. The arc surfaces on the two pressure heads 31 abut against the part of the valve core 7 located above the control shaft hole 71. The two locking rods 241 are respectively inserted into the locking holes 33 on the two pressure heads 32. At this time, the axes of the two control shaft holes 71 of the valve core 7 are parallel to the axis of the connecting hole 111, and the end face of one of the control shaft holes 71 faces the tool. Tighten the connecting nut 232, and the connecting nut 232 presses the locking plate 242, so that the lower edge of the locking rod 241 presses against the locking hole 33, thereby fixing the pressure plate 3.

[0084] The cutting tool processes a control shaft hole 71 and its end face. After processing, the fixing nut is loosened, the positioning block 16 is rotated to disengage the positioning block 16 from the straight edge of the base 2, the limit nut 191 is loosened, and the limit member 18 moves upward under the elastic force of the return spring, rotating the rotating shaft 21 by 180°. The rotating shaft 21 drives the base 2 to rotate synchronously by 180°, so that the other control shaft hole 71 is turned towards the cutting tool. After the positioning block 16 positions the base 2, the fixing nut and the limit nut 191 are tightened to fix the base 2.

[0085] The cutting tool processes the control shaft hole 71 and its end face. After processing, the locking bolt 4 is inserted into the two control shaft holes 71. Fixing part 1 5 and fixing part 2 6 are installed on the locking bolt 4. The locking bolt 4 is rotated, and fixing part 1 5 and fixing part 2 6 move closer to each other and clamp the pressure plate 3 and valve core 7 in the horizontal direction. The locking screw 62 is tightened, and the locking screw 62 drives the wedge block 61 to move down. The inclined surface of the wedge block 61 cooperates with the inclined surface of the wedge groove 311 to press the pressure plate 3 in the vertical direction.

[0086] Then, loosen the connecting nut 232. Under the elastic force of the return spring 231, the locking plate 242 moves upward, and the locking rod 241 can be located in the middle of the lock hole 33. Move the locking part 24, the pressure plate 3, and the valve core 7 upward so that the bottom surface of the valve core 7 is at a certain height from the base 2. Then, rotate the pressure plate 3 and the valve core 7 90° so that the annular spherical surface of the valve core 7 faces the tool. At the same time, the fixing part 5 faces downward and is inserted into the positioning groove 25. The positioning shaft 51 is inserted into the positioning hole 26. Tighten the connecting nut 232 so that the locking plate 242 moves downward. The lower edge of the locking rod 241 presses against the lock hole 33 again to fix the pressure plate 3. The tool then processes the annular spherical surface of the valve core 7.

[0087] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components.

Claims

1. A clamping fixture for valve production, comprising a fixed frame and a base rotatably mounted on the fixed frame, the fixed frame being clamped by a chuck, the base for holding a valve core, and a pressure plate provided on the base above the valve core; characterized in that: Both sides of the pressure plate are connected to the base by connecting bolts. Locking parts are slidably installed on the connecting bolts. The locking parts and the pressure plate are rotatably connected. A return spring is connected between the locking parts and the connecting bolts. A connecting nut is provided on the connecting bolts above the locking parts. Locking bolts are installed in the two control shaft holes of the valve core. The locking bolts have two threads with opposite rotation directions. The two ends of the locking bolts are respectively connected to fixing part one and fixing part two. Both fixing part one and fixing part two are L-shaped. Both fixing part one and fixing part two are connected to the pressure plate by locking screws. The fixing component 1 has a positioning shaft at one end away from the locking screw, and the base has a positioning hole that matches the end of the positioning shaft; the middle part of the base has a mounting groove for installing the valve core, and the mounting groove has a positioning groove that can position the fixing component 1. The positioning hole is set in the positioning groove and is located in the middle part of the mounting groove. The base has a rotating shaft at the bottom, and the bottom of the mounting bracket has mounting holes that rotatably engage with the rotating shaft. The pressure plate has a wedge-shaped groove. Both the first and second fixing parts have wedge-shaped blocks that match the wedge-shaped groove. The wedge blocks and the ends of the locking screws are rotatably connected. The locking screws and the first and second fixing parts are threadedly connected. The pressure plate has lock holes on both sides. The locking part includes a locking rod inserted into the lock hole and a locking plate connected to the locking rod. The locking plate is slidably connected to the connecting bolt.

2. The clamping fixture for valve production according to claim 1, characterized in that: The base has a racetrack-shaped plate with two straight edges and two curved edges. A positioning block is rotatably connected to the fixed frame. The positioning block is connected to the fixed frame by fixing bolts. The end of the positioning block can abut against the straight edge of the base, and the edge of the fixed frame can be parallel to the straight edge of the base.

3. The clamping fixture for valve production according to claim 2, characterized in that: Multiple limiting components are rotatably connected to the edge of the base on the fixed frame. The lower end face of the limiting component can abut against the upper end face of the base. The limiting component and the fixed frame are connected by limiting bolts. A return spring is connected between the limiting component and the fixed frame.

4. The clamping fixture for valve production according to claim 3, characterized in that: One side of the mounting bracket is provided with a connection hole for connecting the chuck claws, and the connection hole is provided with multiple slots that match the chuck claws.

5. The clamping fixture for valve production according to claim 4, characterized in that: The mounting bracket is equipped with a locking frame for locking the mounting bracket and a claw. The locking frame extends through the mounting bracket, and a limit screw is connected to the bottom of the locking frame.

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