Plug milling device for valve core machining

Abstract

The application relates to the technical field of machining tools, and particularly discloses a plug milling device for valve core machining, which comprises a slotter and a positioning clamp installed on the slotter, the positioning clamp comprises: two placing seats for placing valve cores, a height difference exists between the two placing seats, so that the heights of the two valve cores are staggered with each other; a positioning rod is located between the two placing seats and is used for penetrating through through holes at the bottoms of the two valve cores, and a butt joint structure is arranged at the top of the positioning rod; a fixed seat is slidably installed on a workbench of the slotter and can rotate, a locating seat is rotatably installed on the fixed seat, and two abutting portions are arranged at the left and right ends of the locating seat; through the internal limiting mode, the valve core surface indentation problem caused in the process of clamping the valve core outside is effectively avoided, the surface quality and overall performance of the valve core are ensured, the valve core upper and lower through holes are transposed, the valve core does not need to be repositioned, and the adjusting time is saved.

Description

Technical Field

[0001] This invention relates to the field of machine tools, and more specifically to a milling device for machining valve cores. Background Technology

[0002] A slot milling machine (also known as a Z-axis milling machine) is a CNC machine tool specifically designed for efficient roughing and deep cavity machining. Its core feature is the use of a cutting tool's reciprocating feed motion along the Z-axis (vertical direction) for cutting, rather than traditional XY plane milling, making it suitable for machining groove-like features. During machining, the workpiece on the worktable moves longitudinally, laterally, or rotary, while the slot milling cutter reciprocates up and down to cut the workpiece. Slot milling machines are used for slotting planes, shaped surfaces, and keyways, and can also slot molds and other workpieces with inclination angles within 10°. This unique motion of the slot milling machine gives it a significant advantage in machining deep cavities, complex cavities, and difficult-to-machine materials. Due to the reciprocating feed of the cutting tool in the Z-axis direction, a large amount of material can be removed efficiently while maintaining good machining accuracy and surface quality. Furthermore, slot milling machines are typically equipped with a high-rigidity spindle and a precision guideway system to ensure stability and accuracy during high-speed cutting. In valve core machining, the slot milling device can achieve precise machining of complex valve core structures, such as deep holes, grooves, and threads. By adjusting the toolpath and cutting parameters, the machining depth and shape can be flexibly controlled to meet the design requirements of different valve cores. At the same time, the high efficiency and stability of the slot milling machine greatly improve the machining efficiency and product quality of the valve cores.

[0003] Chinese patent document CN113634804B discloses a slotting machine with a tool lifting mechanism, which includes a machine body, a sliding arm, and a tool holder module. The sliding arm is slidably mounted on the machine body, and the tool holder module for mounting the tool is mounted on the lower side of the sliding arm. The tool holder module consists of a main tool holder and an auxiliary tool holder. The main tool holder includes a second mounting arm, mounting lugs, an arc-shaped sliding plate, a tool mounting bracket, a connecting rocker arm, a self-locking block, a leaf spring, a friction block, a self-locking transmission rod, a first spring, and a second spring. The second mounting arm is slidably mounted on a sliding arm, and an adjustment drive module for driving its up-and-down sliding is mounted on the upper side of the second mounting arm. A mounting lug is fixedly mounted on the side wall of the lower end of the second mounting arm. The upper end of the tool mounting bracket is hinged to the mounting lug. The arc-shaped sliding plate is slidably mounted on the second mounting arm, and the center of the arc-shaped sliding plate is located on the hinge axis between the mounting lug and the tool mounting bracket. The self-locking transmission rod is slidably mounted laterally inside the second mounting arm. The self-locking transmission rod and the arc-shaped sliding plate are connected by two connecting rocker arms, and both ends of the two connecting rocker arms are hinged to the self-locking transmission rod and the arc-shaped sliding plate. A second spring is installed between the self-locking transmission rod and the second mounting arm. The second spring is a tension spring with preload.

[0004] When machining the valve core, a slotting machine is needed to mill the keyway. However, during the slotting process, since keyways need to be milled for both through holes on the valve core, after milling the keyway on one through hole, it is necessary to rotate it 180° and then fix and position the valve core again before milling the other keyway. This results in two positioning operations, which leads to low machining efficiency. Moreover, if the valve core is fixed by clamping the outer surface, it is easy to cause indentations on the valve core surface. These indentations will cause unevenness between the valve core and the valve seat, forming local gaps. Summary of the Invention

[0005] This invention provides a milling apparatus for valve core machining, aiming to solve the problem of low efficiency in valve core milling of keyways in related technologies.

[0006] A milling apparatus for machining valve cores includes a slotting machine and a positioning fixture mounted on the slotting machine. The positioning fixture includes:

[0007] The positioning rod and two placement seats for placing valve cores have a height difference between them, so that the heights of the two valve cores are staggered. The positioning rod is located between the two placement seats and is used to pass through the through holes at the bottom of the two valve cores. The top of the positioning rod is provided with a mating structure.

[0008] A fixed seat that can be slidably mounted on the slotting machine worktable and can rotate on its own is provided. A positioning seat is rotatably mounted on the fixed seat. Two abutment parts are provided at the left and right ends of the positioning seat. A limiting component that can be raised and lowered relative to the fixed seat is provided in the middle of the fixed seat. When the limiting component enters between the two valve cores, the positioning seat rotates to a horizontal state, and the two abutment parts move away from each other, thereby abutting against the inner walls of the two valve cores respectively. The positioning rod is connected to the limiting component through a docking structure.

[0009] The lifting assembly is used to control the lifting of the placement seat and the positioning rod. When the positioning rod descends, the limiting assembly descends and locks between the two valve core through holes. Then the fixed seat and the positioning seat rotate 180°, the placement seat and the positioning rod reset, and the milling head descends to reset the limiting assembly and release the valve core.

[0010] Its effect is as follows: First, two valve cores to be processed are placed on two separate mounting seats, with their heights staggered by a certain distance. The through holes on the two valve cores are fitted onto the positioning rod. After the fixed seat and positioning seat enter the gap between the two valve cores, their two abutting parts move in opposite directions to the left and right, ultimately ensuring that the two abutting parts tightly abut against the inner walls of the two valve cores, thus achieving precise positioning of the two valve cores. After the top through hole milling is completed, the positioning rod is lowered under the control of the lifting assembly. Through the docking structure, the limiting assembly is gradually lowered, allowing it to enter between the two through holes at the bottom of the valve core. Subsequently, the fixed seat and positioning seat begin to move together... The valve cores rotate 180° to reach their predetermined positions. At this point, the placement seat and positioning rod rise synchronously under the drive of the lifting mechanism. The positioning rod inserts into the through hole that has just been milled, and the placement seat firmly supports the valve cores to ensure their stable position. Then, the milling head begins to descend, and the limiting component releases the through hole and resets. Afterward, the milling head performs milling work on the two through holes above. This internal limiting method effectively avoids the problem of valve core surface indentation that may occur during the clamping of the valve core on the outside, ensuring the surface quality and overall performance of the valve core. It also realizes the interchange of the upper and lower through holes of the valve core without the need to reposition the valve core, saving adjustment time.

[0011] Preferably, the abutment part consists of an abutment plate and a sliding rod. The positioning seat is provided with a groove that matches the sliding rod, so that the sliding rod is slidably installed on the positioning seat. The two abutment parts are arranged in a rotationally symmetrical manner, and the sliding rod can slide stably in the groove, ensuring that the abutment part can move smoothly to the left and right sides, and thus make close contact with the inner wall of the valve core.

[0012] Preferably, a rack is fixedly installed on the sliding rod, and a gear that meshes with the rack is fixedly connected to the fixed seat. The sliding rod rotates relative to the fixed seat, causing the sliding rod to move around the gear, thereby driving the abutment part to move smoothly to the left and right sides, improving the stability and accuracy of the device.

[0013] Preferably, an anti-slip layer is provided on the side of the abutting plate that abuts against the valve core. The anti-slip layer is made of rubber material, which can effectively increase the friction between the abutting plate and the inner wall of the valve core, preventing the valve core from sliding or rotating during the flipping process. The anti-slip layer also has a certain degree of elasticity, which can adapt to the slight deformation of the inner wall of the valve core to a certain extent, ensuring close contact between the abutting part and the inner wall of the valve core.

[0014] Preferably, the limiting component includes an insert block adapted to the through hole of the valve core. The middle part of the fixed seat has a mounting hole adapted to the insert block, and the insert block is slidably connected to the fixed seat. An elastic element is connected between the insert block and the fixed seat to keep the insert block in the mounting hole. A limiting structure is installed at the bottom of the insert block. After the insert block passes through the through hole of the valve core, the limiting structure is used to prevent the elastic element from pulling the insert block back to its original position. The insert block can enter the through hole of the valve core under the action of the positioning rod, thereby limiting the valve core. When it is necessary to flip the valve core, the limiting structure can prevent the insert block from resetting, ensuring that the insert block always remains in the through hole, thereby ensuring the smooth progress of the flipping process.

[0015] Preferably, the limiting structure includes two symmetrically arranged wedge blocks. The bottom of the insert block has sliding holes on both sides for the wedge blocks to slide along the radial direction of the insert block. A control structure for controlling the sliding of the wedge blocks is installed inside the insert block. The wedge blocks can slide along the radial direction of the insert block under the action of the control structure. When the insert block enters the through hole of the valve core, the wedge blocks slide outward and make close contact with the bottom end of the valve core, thereby preventing the insert blocks from resetting under the action of the elastic element, ensuring that the insert blocks can always remain in the through hole of the valve core.

[0016] Preferably, the control structure includes a pressure rod and two connecting rods respectively hinged to the inner ends of two wedge blocks. The ends of the two connecting rods that are close to each other are hinged to the inner end of the pressure rod. The pressure rod is slidably installed in the insert block along the axial direction of the insert block, and a reset element is connected between the two. The bottom end of the pressure rod extends to the bottom surface of the insert block and is connected to an abutment piece. When the insert block needs to disengage from the through hole of the valve core, the milling head contacts the abutment piece, and the milling head pushes the pressure rod to slide along the axial direction of the insert block. The pressure rod drives the ends of the two connecting rods that are far apart to move, thereby causing the ends of the two wedge blocks that are close to each other to move towards the center of the insert block. The wedge blocks gradually contract until they are completely disengaged from the valve core. At this time, the elastic element pulls the insert block to reset, so that the insert block disengages from the through hole of the valve core.

[0017] Preferably, the docking structure includes a claw and a drive assembly at the top of the positioning rod. The bottom of the insert block has a slot that matches the claw. When the positioning rod contacts the insert block, the drive assembly drives the claw to move and engage with the slot. When the positioning rod descends, the claw engages with the slot at the bottom of the insert block under the action of the drive assembly, thereby connecting the positioning rod and the insert block together. When the positioning rod continues to descend, the insert block also descends until it enters the through hole of the valve core. At this time, the two wedge blocks pop outward, thereby locking the insert block in the through hole and preventing the insert block from resetting under the action of the elastic element, ensuring that the insert block can always remain in the through hole of the valve core.

[0018] Preferably, the bottom edge of the insert and the top edge of the positioning rod are both chamfered. The chamfer design facilitates the smooth entry of the insert into the through hole of the valve core, avoiding excessive resistance or jamming during insertion, and improving the reliability and smoothness of the device.

[0019] Preferably, the slotting machine worktable is equipped with a sliding device along the front-to-back direction. A rotary drive source is installed on the sliding device. The drive end of the rotary drive source is connected to the fixed seat through a drive rod. The positioning seat is rotatably mounted on the drive rod, and an angle adjustment drive for deflecting the positioning seat is installed between the two. The rotary drive source can drive the fixed seat and the positioning seat to rotate, thereby driving the valve core to rotate 180°, realizing the interchange of the upper and lower through holes of the valve core. The angle adjustment drive is used to adjust the deflection angle of the positioning seat, so that the two abutting parts can tightly abut against the inner walls of the two valve cores respectively, realizing the precise positioning of the valve core. The whole device has a compact structure and is easy to operate, which greatly improves the processing efficiency and quality of valve core slotting and milling keyways.

[0020] By adopting the above technical solution, the beneficial effects of the present invention are as follows:

[0021] 1. During machining, place the two valve cores to be machined on two separate mounting seats, ensuring a height difference between the two valve cores and that their through holes fit onto the positioning rod. The fixed seat and positioning seat are inserted between the two valve cores, and the two contact parts move in opposite directions to the left and right until they are in close contact with the inner walls of the two valve cores, thus limiting the movement of the two valve cores. After the top through hole milling is completed, the lifting assembly controls the positioning rod to descend, and the limiting assembly also descends simultaneously, so that the limiting assembly enters between the two through holes at the bottom of the valve core. Subsequently, the fixed seat and positioning seat rotate synchronously, causing the two valve cores to rotate 180 degrees. At the predetermined position, the placement seat and positioning rod rise synchronously under the drive of the lifting mechanism. The positioning rod is inserted into the through hole that has just been milled. The placement seat stably supports the valve core, ensuring its stable position. Then, the milling head descends, the limiting component is released and reset, and then the milling head performs milling operation on the two through holes above. Through the internal limiting mechanism, the valve core surface indentation problem that may occur during the clamping of the valve core is effectively avoided, ensuring the surface quality and overall performance of the valve core. The valve core can be interchanged between the upper and lower through holes without repositioning the valve core, saving adjustment time.

[0022] 2. When the positioning rod descends, the jaws pull the insert block downwards. As the insert block begins to descend and gradually enters between the two through holes at the bottom, the wedge block quickly pops out and firmly locks into the bottom position of the valve core through hole, preventing the insert block from retracting and returning to its original position during subsequent processes. Then, the fixed seat and positioning seat rotate synchronously, causing the two valve cores to rotate 180°. Subsequently, the milling head begins to descend until its bottom end is firmly abutted against the abutment plate. At this point, the pressure rod retracts inwards under mechanical force. This retraction action is transmitted through the connecting rod, pulling the wedge block to move, ultimately allowing the wedge block to retract smoothly. Simultaneously with the wedge block's retraction, the insert block quickly returns to its initial position under the elastic force of the elastic band, completing the entire mechanical cycle. Attached Figure Description

[0023] Figure 1 This is a side view of the present invention.

[0024] Figure 2 This is a top view of the positioning fixture in this invention.

[0025] Figure 3 This is an assembly diagram of the positioning fixture in this invention.

[0026] Figure 4 This is a schematic diagram of step two of the work process.

[0027] Figure 5 This is a schematic diagram of step three of the work process.

[0028] Figure 6 This is a schematic diagram of step five in the work process.

[0029] Figure 7 This is a schematic diagram of step seven of the work process.

[0030] Figure 8 This is a cross-sectional view of the limiting structure in this invention.

[0031] Figure 9 This is a front view of the telescopic sleeve in this invention.

[0032] Figure label:

[0033] 1. Slotting bed; 11. Sliding device; 12. Rotary drive source; 13. Drive rod; 14. Angle adjustment drive; 2. Placement seat; 3. Positioning rod; 31. Docking structure; 311. Claw; 312. Push rod; 4. Fixed seat; 41. Gear; 5. Positioning seat; 51. Abutment part; 511. Docking plate; 512. Sliding rod; 513. Rack; 52. Limiting component; 521. Telescopic sleeve; 522. Insertion block; 5221. Slot; 523. Elastic element; 524. Limiting structure; 5241. Wedge block; 5242. Pressure rod; 5243. Connecting rod; 5244. Reset component. Detailed Implementation

[0034] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0035] like Figure 1 As shown, a slotting milling device for valve core machining includes a slotting machine 1 and a positioning fixture. The slotting machine 1 includes a slotting milling head, a bed, a ram, and a worktable. The bed serves as the basic component of the slotting machine and has sufficient rigidity and stability to support and fix other components, ensuring the accuracy and stability of the slotting process. The ram moves longitudinally along the guide rail of the bed to drive the slotting milling head for slotting. The movement of the ram is driven by a motor and a transmission mechanism, enabling smooth and precise feed. The worktable is used to mount the workpiece and can be adjusted laterally, longitudinally, or rotatably according to machining requirements. The design of the worktable facilitates the clamping and positioning of the workpiece, ensuring the smooth progress of the machining process. The slotting milling head is mounted above the worktable and can move up and down to slot the workpiece. The positioning fixture is mounted on the worktable for positioning the valve core.

[0036] like Figures 1-9 As shown, the positioning fixture includes two placement seats 2, a positioning rod 3, a fixed seat 4, a positioning seat 5, and a lifting assembly (the lifting assembly is not shown in the figure). The placement seats 2 and the positioning rod 3 are installed on the worktable of the slotting machine 1 and are raised and lowered by the lifting assembly. The top of the positioning rod 3 is equipped with a docking structure 31. When placing the valve core, the two valve cores are oriented in opposite directions, and the through hole on the upper valve core is inserted into the positioning rod 3. The top of the positioning rod 3 is chamfered, and the positioning rod 3 is adapted to the valve core, thereby positioning the position of the through hole of the two valve cores. The two placement seats 2 with different heights support the circumferential surfaces of the two valve cores respectively, and the upper surface of the placement seat 2 is arc-shaped and adapted to the circumferential surface of the valve core.

[0037] A sliding device 11 along the front-to-back direction is installed on the worktable of the slotting machine 1. A rotary drive source 12 is installed on the sliding device 11. The drive end of the rotary drive source 12 is connected to the fixed seat 4 through the drive rod 13. The positioning seat 5 is rotatably installed on the drive rod 13. An angle adjustment drive 14 for deflecting the positioning seat 5 is installed between the two. The angle adjustment drive 14 is used to drive the positioning seat 5 to rotate a certain angle so that the top surface of the positioning seat 5 matches the inclination of the inlet and outlet formed between the two valve cores. Then, the sliding device 11 controls the fixed seat 4 and the positioning seat 5 to move in the front-to-back direction so that the fixed seat 4 and the positioning seat 5 enter or leave between the two valve cores.

[0038] The sliding device 11 is preferably a lead screw drive mechanism, and the rotary drive source 12 is preferably a servo motor. The lead screw drive mechanism can accurately control the sliding distance to ensure the accurate positioning of the fixed seat 4 and the positioning seat 5 during the processing. The servo motor control provides high-precision rotary control. The center of the servo electric turntable is hollow. The rotary drive source 12 is driven by the servo motor, which can accurately adjust the position of the fixed seat 4 to ensure the stability and accuracy during processing. The angle adjustment drive 14 is a servo electric turntable, which can finely adjust the rotation angle of the positioning seat 5 to perfectly match the inclination of the valve core inlet and outlet.

[0039] The positioning seat 5 has abutment parts 51 at both ends and a limiting component 52 in the middle. The top of the positioning rod 3 has a docking mechanism adapted to the limiting component 52. When the fixed seat 4 and the positioning seat 5 enter between the two valve cores, the two abutment parts 51 move to the left and right respectively, so that they abut against the inner walls of the two valve cores respectively, thereby limiting the two valve cores. After the top through hole milling is completed, the positioning rod 3 descends and pulls the limiting component 52 down through the docking structure 31, so that the limiting component 52 descends into the two through holes at the bottom. Then the fixed seat 4 and the positioning seat 5 rotate synchronously, so that the two valve cores rotate 180°. The placement seat 2 and the positioning rod 3 rise, the positioning rod 3 is inserted into the milled through hole, the placement seat 2 supports the valve core, and then the milling head descends, the limiting component 52 releases the through hole and resets, thus completing the milling of the upper and lower through holes of the two valve cores.

[0040] Two abutment parts 51 are arranged rotationally symmetrically about the axis of the drive rod 13. Each abutment part 51 includes a mating plate 511 and two sliding rods 512. The mating plate 511 is fixedly connected to the two sliding rods 512. The side of the mating plate 511 that abuts against the inner wall of the valve core is provided with an anti-slip layer. The two sliding rods 512 are parallel. The positioning seat 5 is provided with a sliding groove that matches the sliding rod 512, so that the sliding rod 512 is slidably mounted on the positioning seat 5. Both sliding rods 512 are provided with racks 513. Two gears 41 are fixedly provided on the fixed seat 4. The upper and lower sides of the gears 41 respectively mesh with the racks 513 on the sliding rods of the two abutment parts 51. When the positioning seat 5 enters between the two valve bodies, the rotating hydraulic cylinder drives the positioning seat 5 to reset, so that the racks 513 move along the gears 41, so that the sliding rods 512 move away from the positioning seat 5, and the mating plate 511 abuts against the inner wall of the valve body, thereby completing the positioning of the two valve bodies.

[0041] Limiting component 52 includes telescopic sleeve 521 (see details of telescopic sleeve 521). Figure 8 and Figure 9The structure comprises an insert block 522, an elastic element 523, and a limiting structure 524. The insert block 522 is slidably mounted on the telescopic sleeve 521. The middle of the fixing base 4 has a mounting hole adapted to the insert block 522 to accommodate the telescopic sleeve 521 and the insert block 522. The top end of the telescopic sleeve 521 is fixedly connected to the fixing base 4. The elastic element 523 is an elastic band, with its two ends connected to the top end of the telescopic sleeve 521 and the bottom end of the insert block 522, respectively, so that the insert block 522 and the telescopic sleeve 521 are in the shortest length state. The limiting structure 524 is installed at the bottom end of the insert block 522. When the insert block 522... 2. The limiting structure 524 is locked at the bottom of the valve core through the through hole, thereby limiting the valve core and preventing the insert block 522 from resetting during the rotation of the valve core. This ensures the stability and reliability of the positioning. The limiting structure 524 can quickly pop out and lock after the insert block 522 enters the valve core through hole, effectively preventing the insert block 522 from resetting. At the same time, when the insert block 522 needs to be reset, it can be smoothly retracted through a simple mechanical action. This realizes the fast and reliable limiting and resetting function of the insert block 522, so that the positioning fixture can maintain a high degree of stability and accuracy during operation.

[0042] The limiting structure 524 includes two wedge blocks 5241, a pressure rod 5242, two connecting rods 5243, and a reset member 5244 (see attached diagram). Figure 8 The bottom of the insert 522 has symmetrical sliding holes on both sides for the wedge blocks 5241 to slide along the radial direction of the insert 522. Two wedge blocks 5241 are slidably installed in the through holes. Two connecting rods 5243 are hinged to the inner ends of the two wedge blocks 5241, with the inner end being the end closest to the center of the insert 522. The top end of the pressure rod 5242 is hinged to the two connecting rods 5243, and the pressure rod 5242 is slidably installed in the insert 522 along the axial direction of the insert 522. The reset member 5244 is a spring connected between the pressure rod 5242 and the insert 522, thereby causing the wedge-shaped end of the wedge block 5241 to protrude from the side of the insert 522. The bottom end of 5242 extends to the bottom surface of the insert block 522 and is connected to an abutment piece. When the insert block 522 descends into the two through holes at the bottom, the wedge block 5241 pops out and gets stuck at the bottom of the valve core through hole to prevent the insert block 522 from retracting. Then the fixed seat 4 and the positioning seat 5 rotate synchronously, thereby rotating the two valve cores 180°. The placement seat 2 and the positioning rod 3 rise, and the positioning rod 3 is inserted into the milled through hole. The placement seat 2 supports the valve core. Then the milling head descends and abuts against the abutment piece. The pressure rod 5242 retracts inward, thereby causing the connecting rod 5243 to pull the wedge block 5241 to move, thereby causing the wedge block 5241 to retract. The insert block 522 is reset by the action of the elastic band.

[0043] The docking structure 31 includes two jaws 311, which are hinged to the top of the positioning rod 3. The bottom of the insertion block 522 has a slot 5221 adapted to the jaws 311. The positioning rod 3 contains a drive assembly for controlling the rotation of the jaws 311. The drive assembly includes a telescopic drive (not shown in the figure) and a push rod 312 installed within the positioning rod 3. The push rod 312 connects the drive end of the telescopic drive to the jaws 311. When the through-hole milling at the top is completed, the telescopic drive is activated, and the push rod 312 pushes the jaws 311 to rotate, causing the jaws 311 to enter the slot 5221. Then, the positioning rod 3 descends, pulling the insertion block 522 down through the jaws 311. When the insert block 522 descends between the two through holes at the bottom, and the wedge block 5241 pops out and locks into the bottom of the valve core through hole, the telescopic drive resets the push rod 312, thereby disengaging the pawl 311 from the slot 5221. Then, the positioning rod 3 and the placement seat 2 descend synchronously, and then the fixed seat 4 and the positioning seat 5 rotate synchronously, thereby causing the two valve cores to flip and insert into another through hole. During this process, the pawl 311 ensures that the insert block 522 can descend stably with the positioning rod 3, avoiding shaking or misalignment during the positioning process, further improving the operation steps and stability. In addition, the cooperation between the pawl 311 and the slot 5221 also simplifies the operation process, making the operation of the entire device more convenient and faster.

[0044] In addition, it is worth noting that the telescopic drive (not shown in the figure) in this device uses high-precision and high-stability drive components, such as electric push rods or pneumatic cylinders, to ensure that the push rod 312 can accurately and quickly drive the chuck 311 to rotate, thereby achieving stable pulling of the insert block 522. At the same time, the driving force of the telescopic drive can also be adjusted according to actual needs to adapt to the processing requirements of valve cores of different specifications and materials.

[0045] In summary, the valve core machining milling device of the present invention, through a series of ingenious designs and optimizations, realizes the transposition milling of the upper and lower through holes of the valve core without the need for valve core repositioning, greatly saving adjustment time and improving machining efficiency and quality. At the same time, the device also has the advantages of compact structure, simple operation, and high stability.

[0046] The work steps are as follows:

[0047] Step 1: Place the two valve cores to be processed on the two placement seats 2 respectively, with the heights of the two valve cores staggered so that the through holes on the two valve cores fit onto the positioning rod 3. The top chamfer of the positioning rod 3 facilitates the quick alignment of the valve core through holes and allows them to pass through the positioning rod 3.

[0048] Step 2: Start the sliding device 11 to drive the fixed seat 4 and the positioning seat 5 forward, so that the positioning seat 5 enters between the two valve cores;

[0049] Step 3: Then start the angle adjustment drive 14 to rotate the positioning seat 5 to a horizontal state. At this time, the two abutting parts 51 move to the left and right directions respectively under the meshing action of gear 41 and rack 513 until the abutting plate abuts against the inner wall of the two valve cores, thus completing the positioning of the valve cores.

[0050] Step 4: Start the milling head and mill the through hole at the top;

[0051] Step 5: After the top through hole is machined, the positioning rod 3 rises close to the insert block 522, and the telescopic drive inside the positioning rod 3 is activated to push the claw 311 to rotate into the slot 5221 at the bottom of the insert block 522. Then, the positioning rod 3 and the placement seat 2 are controlled to descend synchronously, and the insert block 522 is pulled down by the claw 311 until the insert block 522 enters between the two through holes at the bottom. At this time, the wedge block 5241 pops out under the action of the elastic element 523 and is stuck at the bottom of the valve core through hole.

[0052] Step 6: After the insert block 522 stably locks the valve core, the telescopic drive resets the push rod 312, thereby disengaging the claw 311 from the slot 5221. Then, the positioning rod 3 and the placement seat 2 descend synchronously.

[0053] Step 7: Start the rotary drive source 12 to rotate the fixed seat 4 and the positioning seat 5 180 degrees synchronously, so that the two valve cores are flipped. Then start the lifting assembly to control the placement seat 2 and the positioning rod 3 to rise synchronously. The positioning rod 3 is inserted into the milled through hole, and the placement seat 2 supports the valve core.

[0054] Step 8: Restart the milling head. The milling head descends and abuts against the abutment plate. The pressure rod 5242 retracts inward, which causes the connecting rod 5243 to pull the wedge block 5241 to move, thereby causing the wedge block 5241 to retract. The insert block 522 resets under the action of the elastic band, and at the same time, the through hole at the top is milled.

[0055] Step 9: After the milling process is completed, the positioning rod 3 descends and disengages from the valve core through hole;

[0056] Step 10: Start the angle adjustment drive 14 to rotate the positioning seat 5 to the tilted state. At this time, the two abutting parts 51 will come closer to each other under the meshing action of the gear 41 and the rack 513.

[0057] Step 11: Start the sliding device 11 to move the fixed seat 4 and the positioning seat 5 backward, so that the positioning seat 5 is separated from the two valve cores. Then, rotate the fixed seat 4 and the positioning seat 5 180 degrees synchronously to reset them.

[0058] When milling the first through hole, the two valve cores are positioned by the abutment part 51 and the positioning rod 3, thus avoiding the outer side of the valve core from being clamped and causing indentations on the valve core surface. When milling the second through hole, the placement seat 2 and the positioning rod 3 are lowered synchronously by the lifting assembly, so that the insert block 522 enters the through hole at the bottom of the valve core. At this time, the wedge block 5241 pops out under the action of the elastic element 523 and is stuck at the bottom of the valve core through hole, thus limiting the valve core and preventing the insert block 522 from retracting, ensuring the stability of the milling. After the milling is completed, the milling head abuts against the abutment piece, causing the pressure rod 5242 to retract inward. The connecting rod 5243 pulls the wedge block 5241 to move, the wedge block 5241 retracts, and the insert block 522 is reset under the action of the elastic band, thus making it easy to remove the insert block 522 from the valve core through hole. This realizes the milling of the upper and lower through holes of the valve core without the need to reposition the valve core, which greatly improves the processing efficiency.

[0059] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A slotting milling device for machining valve cores, comprising a slotting machine (1) and a positioning fixture mounted on the slotting machine (1), characterized in that, The positioning fixture includes: The positioning rod (3) and two placement seats (2) for placing valve cores are provided. There is a height difference between the two placement seats (2), so that the heights of the two valve cores are staggered. The positioning rod (3) is located between the two placement seats (2) and is used to pass through the through holes at the bottom of the two valve cores. The top of the positioning rod (3) is provided with a docking structure (31). A fixed seat (4) that can be rotated is slidably mounted on the worktable of the slotting machine (1). A positioning seat (5) is rotatably mounted on the fixed seat (4). Two abutting parts (51) are provided at the left and right ends of the positioning seat (5). A limiting component (52) that can be raised and lowered relative to the fixed seat (4) is provided in the middle of the fixed seat (4). When the limiting component (52) enters between the two valve cores, the positioning seat (5) rotates to a horizontal state, and the two abutting parts (51) move away from each other, thereby abutting against the inner walls of the two valve cores respectively. The positioning rod (3) is connected to the limiting component (52) through the docking structure (31). The lifting assembly is used to control the lifting of the placement seat (2) and the positioning rod (3). When the positioning rod (3) descends, the limiting assembly (52) descends and gets stuck between the two valve core through holes. Then the fixed seat (4) and the positioning seat (5) rotate 180°, the placement seat (2) and the positioning rod (3) reset, and the milling head descends to reset the limiting assembly (52) and release the valve core.

2. The milling apparatus for valve core machining according to claim 1, characterized in that, The abutting part (51) consists of an abutting plate and a sliding rod (512). The positioning seat (5) is provided with a sliding groove that matches the sliding rod (512), so that the sliding rod (512) is slidably installed on the positioning seat (5), and the two abutting parts (51) are arranged in a rotationally symmetrical manner.

3. The milling apparatus for valve core machining according to claim 2, characterized in that, A rack (513) is fixedly installed on the sliding rod (512), and a gear (41) that meshes with the rack (513) is fixedly connected to the fixed seat (4).

4. The milling apparatus for valve core machining according to claim 2, characterized in that, An anti-slip layer is provided on the side of the abutment plate that abuts against the valve core.

5. The milling apparatus for valve core machining according to claim 3, characterized in that, The limiting component (52) includes a plug (522) adapted to the valve core through hole. The middle part of the fixed seat (4) is provided with a mounting hole adapted to the plug (522). The plug (522) and the fixed seat (4) are slidably connected. An elastic element (523) for positioning the plug (522) in the mounting hole is connected between the plug (522) and the fixed seat (4). A limiting structure (524) is installed at the bottom of the plug (522). After the plug (522) passes through the valve core through hole, the limiting structure (524) is used to prevent the elastic element (523) from pulling the plug (522) to reset.

6. The milling apparatus for valve core machining according to claim 5, characterized in that, The limiting structure (524) includes two symmetrically arranged wedge blocks (5241). The bottom of the insert block (522) has sliding holes on both sides for the wedge blocks (5241) to slide along the radial direction of the insert block (522). The insert block (522) is equipped with a control structure for controlling the sliding of the wedge blocks (5241).

7. The milling apparatus for valve core machining according to claim 6, characterized in that, The control structure includes a pressure rod (5242) and two connecting rods (5243) respectively hinged to the inner ends of two wedge blocks (5241). The two connecting rods (5243) are hinged to the inner end of the pressure rod (5242) at one end close to each other. The pressure rod (5242) is slidably installed in the insert block (522) along the axial direction of the insert block (522), and a reset member (5244) is connected between the two. The bottom end of the pressure rod (5242) extends to the bottom surface of the insert block (522) and is connected to an abutment piece.

8. The milling apparatus for valve core machining according to claim 7, characterized in that, The docking structure (31) includes a claw (311) and a drive assembly at the top of the positioning rod (3). The bottom of the insert block (522) is provided with a slot (5221) that is compatible with the claw (311). When the positioning rod (3) contacts the insert block (522), the drive assembly drives the claw (311) to move and hook into the slot (5221).

9. The milling apparatus for valve core machining according to claim 5, characterized in that, The bottom edge of the insert (522) and the top edge of the positioning rod (3) are both chamfered.

10. The milling apparatus for valve core machining according to claim 1, characterized in that, The slotting machine (1) has a sliding device (11) installed on its worktable in the front-to-back direction. A rotary drive source (12) is installed on the sliding device (11). The drive end of the rotary drive source (12) is connected to the fixed seat (4) through a drive rod (13). The positioning seat (5) is rotatably mounted on the drive rod (13), and an angle adjustment drive (14) for deflecting the positioning seat (5) is installed between the two.

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