A processing device and process for a valve stem of a track ball valve

Abstract

This application discloses a processing device and process for a track ball valve stem, relating to the field of valve stem grinding. The device comprises a machine body, a sliding plate, a three-jaw chuck, a centering pin, and a grinding wheel. The centering pin is slidably mounted on the machine body. The three-jaw chuck and centering pin cooperate to position the valve stem. The sliding plate is slidably mounted on the machine body. An adjustment plate is also slidably mounted on the sliding plate. The sliding directions of the sliding plate and the adjustment plate are perpendicular. A transmission screw is rotatably mounted on the sliding plate. The adjustment plate is threadedly connected to the transmission screw. The grinding wheel is mounted on the adjustment plate. This application helps reduce safety risks and improve the degree of automation in processing.

Description

Technical Field

[0001] The present application relates to the field of valve stem grinding, and in particular to a processing device and process for a valve stem of a track ball valve. Background Art

[0002] The orbital ball valve is a valve that opens and closes by rotating the ball around the center line of the valve body.

[0003] When the track ball valve is opened, the handwheel drives the valve stem to rise. Under the interaction of the spiral groove of the valve stem and the guide pin, the ball rotates without friction. When the track ball valve is closed, the handwheel is reversed, the valve stem descends, and the valve stem drives the ball to rotate 90 degrees synchronously. At the end of the handwheel rotation, the angular plane at the bottom of the valve stem mechanically wedges to press the ball, so that it is tightly pressed on the valve seat to achieve complete sealing.

[0004] Therefore, among the components of the track ball valve, the valve stem plays a vital role. The valve stem processing process is as follows: casting, forming the valve stem blank; turning, processing the valve stem to the required diameter, and in practice, there are two sections with different diameters on the valve stem; grinding, grinding the valve stem surface to improve the flatness; milling, forming the spiral groove and related key grooves on the valve stem surface; wire cutting, forming the wedge surface at the lower end of the valve stem. Figure 1 .

[0005] During the valve stem grinding process, the grinding process is extremely important. The flatness and smoothness of the valve stem surface directly affect the sealing performance of the valve. The valve stem is usually clamped and fixed, and then the valve stem is driven to rotate. The valve stem surface contacts the grinding wheel, and then the valve stem slides to achieve the grinding of the valve stem surface.

[0006] However, since there are different diameter sections on the surface of the valve stem, the staff needs to adjust the position of the grinding wheel in the middle so that the grinding wheel and the surface of the valve stem are always in contact. During the adjustment process, since both the valve stem and the grinding wheel are in a rotating state, there will be certain safety hazards. In addition, since manual adjustment is required, the degree of automation needs to be improved. Summary of the Invention

[0007] In order to reduce safety risks and improve the degree of automation, the present application provides a processing device and process for a track ball valve stem.

[0008] The present application provides a track ball valve stem processing device and process using the following technical solutions:

[0009] A processing device for a track ball valve stem includes a machine body, a sliding plate, a three-jaw chuck, a center and a grinding wheel. The center is slidingly set on the machine body. The three-jaw chuck and the center cooperate to position the valve stem. The sliding plate is slidingly set on the machine body. An adjustment plate is also slidingly set on the sliding plate. The sliding directions of the sliding plate and the adjustment plate are perpendicular. A transmission screw is rotatably set on the sliding plate. The adjustment plate is threadedly connected to the transmission screw. The grinding wheel is installed on the adjustment plate.

[0010] By adopting the above technical solution, one end of the valve stem is clamped and fixed by a three-jaw chuck, and then the top slides to abut against the center hole of the other end of the valve stem, and then the screw rotates to drive the adjustment plate to slide, so that the grinding wheel contacts the surface of the valve stem. Under the coordinated rotation of the valve stem and the grinding wheel, the valve stem can be polished; the entire valve stem can be polished by sliding the sliding plate along the length direction of the valve stem. In actual processing, it is usually processed from the large diameter section to the small diameter section of the valve stem. When the grinding wheel moves to the valve stem segment, the screw drives the adjustment plate to slide, so that the grinding wheel can smoothly transition from the large diameter section of the valve stem to the small diameter section; the grinding wheel position is adjusted by the rotation of the motor-driven screw, which has better safety performance than manual adjustment and fixation by staff, and the processing device has a higher degree of automation.

[0011] Preferably, a sliding seat is slidingly provided on the body, a mounting sleeve is fixedly connected to the sliding seat, and the top is rotatably provided on the mounting sleeve; a conical surface is formed at the front end of the top, a sliding rod is slidingly provided inside the top, a friction block adapted to the shape of the conical surface is provided at the end of the sliding rod, and the friction block is hinged to the sliding rod through a torsion spring.

[0012] By adopting the above technical solution, in the initial state, the friction block is accommodated in the conical surface and forms an integral body with the surface of the conical surface. When the top contacts the center hole of the valve stem, there are the following two situations: the conical surface of the center hole of the valve stem and the conical surface of the top are adapted to fit together. Then, when the top contacts the center hole, the conical surface and the conical surface of the center hole will fit together and there will be friction between the two. When the top rotates, the top rotates with it. When the taper of the center hole of the valve stem is large, there will be a certain friction between the conical surface and the conical surface of the center hole when the top contacts the center hole. The front end of the friction block will first contact with the conical surface of the center hole, and then the friction block will gradually rotate with the sliding of the sliding rod until it fits with the conical surface of the center hole. At this time, the friction block and the conical surface of the center hole generate greater friction. When the valve stem rotates, the top rotates synchronously under the action of friction. The top and the valve stem rotate synchronously, and the friction force mainly acts on the bearing of the top, rather than the direct contact between the center hole and the top, which reduces friction and wear and extends the service life of the top and the center hole.

[0013] Preferably, a rotating block is rotatably connected in the mounting sleeve through a bearing, a connecting rod is fixedly provided on the rotating block, and the end of the connecting rod is fixedly connected to a linkage block, a sliding groove is provided in the top, the linkage block slides with the sliding groove, and a limiting block is provided on the circumferential side of the linkage block, a limiting groove is provided on the inner wall of the sliding groove, and the limit block slides with the limit groove; one end of the sliding rod away from the friction block is fixedly connected to the limit block; an abutment plate is provided on the connecting rod, and a compression spring is sleeved on the connecting rod, one end of the compression spring abuts against the end face of the top, and the other end of the compression spring abuts against the abutment plate.

[0014] By adopting the above technical solution, in the initial state, under the action of the compression spring, the linkage block abuts against one end of the sliding groove; after the sliding seat slides to drive the top to abut against the center hole of the valve stem, the sliding seat continues to slide, the compression spring is compressed, and at the same time the linkage block slides in the sliding groove, driving the sliding rod to slide through the limit block, so that the friction block disengages from the conical surface and gradually fits tightly against the conical surface of the center hole.

[0015] Preferably, a positioning block is provided on the inner wall of the sliding groove of the top, and the positioning block limits the moving position of the linkage block.

[0016] By adopting the above technical solution, after the top tip abuts against the center hole of the valve stem, the linkage block continues to slide, and the linkage block abuts against the positioning block to limit the position. At this time, the friction block abuts against the conical surface of the center hole, that is, the top tip cannot slide toward the mounting sleeve. This can help prevent the top tip from being displaced on the connecting rod due to the movement between the top tip and the valve stem during the grinding operation, thereby affecting the positioning accuracy of the valve stem.

[0017] Preferably, a sliding groove is provided on the inner wall of the sliding groove of the top, the positioning block is slidably matched with the sliding groove, and a locking piece for locking the position of the positioning block is provided on the top.

[0018] By adopting the above technical solution, the sliding position of the linkage block can be adjusted by adjusting the position of the positioning block, and different center holes of the valve stem can be adapted. By adjusting the position of the linkage block, the sliding distance of the sliding rod can be controlled, and then the position of the friction plate can be adjusted to adapt to the friction contact with different center holes.

[0019] Preferably, the sliding groove is opened through, the outer wall of the top is formed with a countersunk head at the slot of the sliding groove, a plurality of threaded holes are opened on the countersunk head, a sliding portion is formed on the positioning block, and the locking piece is configured as a locking bolt, which passes through the sliding portion and is threadedly connected to the threaded hole.

[0020] By adopting the above technical solution, the locking bolt is rotated to make it fall off. At this time, the positioning block can slide in the sliding groove. When the positioning block slides to the appropriate position, the locking bolt is used to pass through the sliding part and threadedly connected to the threaded hole to achieve locking of the positioning block position.

[0021] Preferably, the side of the rotating block away from the connecting rod is connected to a cooling pipe through a rotating joint, a first flow channel is provided in the connecting rod, the cooling pipe is communicated with the first flow channel, a second flow channel is provided in the sliding rod, the first flow channel is communicated with the second flow channel, a third flow channel is provided in the friction block, the outlet of the third flow channel is located on the side of the friction block close to the top end, and the second flow channel is communicated with the third flow channel; the mounting sleeve is provided with a limiting member to limit the rotation of the rotating block.

[0022] By adopting the above technical solution, in the actual processing process, the top does not rotate, which will improve the positioning accuracy of the valve stem and ensure the subsequent grinding effect. Therefore, when the processing accuracy of the valve stem is high, the top needs to remain stationary; the rotating block is restricted and locked by the limiting member to keep it stationary, and then the top is abutted against the center hole of the valve stem. In this case, by adjusting the position of the positioning block, the linkage block can only slide a small distance relative to the top, and the friction block will not contact the conical surface of the center hole, thereby reducing the friction between the top and the center hole. At this time, since the linkage block moves a small distance, With the cooperation of the torsion spring, the friction block will also move a small distance, and the angle of the friction block will change, and the lower end of the friction block will rotate outward by a certain angle; because when the top does not rotate, the valve stem will rotate relative to the top, and there will be friction between the top and the center hole, which will cause overheating for a long time, causing the workpiece to bend or "burn" the center hole. Therefore, lubricating fluid is introduced into the cooling pipe, and the lubricating fluid passes through the first flow channel, the second flow channel and the third flow channel in sequence, and finally sprays to the junction of the top and the center hole to lubricate and cool the friction point, thereby reducing friction resistance, and can cool down in time to prevent excessive heat.

[0023] Preferably, an annular accommodating space is formed on one side of the mounting sleeve close to the top, a first limiting plate is provided in the accommodating space of the mounting sleeve, a second limiting plate is provided on the connecting rod, and the limiting member is configured as a limiting block, the limiting block is plugged into the accommodating space, and a limiting groove is formed on the limiting block to plug into the first limiting plate and the second limiting plate.

[0024] By adopting the above technical solution, when the valve stem processing accuracy is high, it is necessary to adjust the top so that the top cannot rotate. By plugging the limiting block into the accommodating space, and plugging the limiting block into the first limiting plate and the second limiting plate, the relative fixation of the connecting rod and the mounting sleeve is achieved, that is, the locking of the top rotation is achieved.

[0025] Preferably, support plates are provided at the ends of the sliding rod relative to each other, a hinge rod is provided between the two support plates, a rotating sleeve is formed on one side of the friction block, and the rotating sleeve is hinged to the hinge rod by a torsion spring; a first connecting hole is provided in the linkage block, one end of the first connecting hole is connected to the first flow channel, and the other end of the first connecting hole is connected to the second flow channel; a second connecting hole is provided in the hinge rod, and a connecting hole is provided in the support plate, and the connecting hole is used to connect the second flow channel and the second connecting hole, a first connecting port connected to the second connecting hole is provided on the hinge rod, a second connecting port connected to the first connecting port is provided on the rotating sleeve, and the second connecting port is connected to the third flow channel.

[0026] By adopting the above technical solution, the lubricating liquid enters the first flow channel from the cooling pipe, and then passes through the first connecting hole, the second flow channel, the connecting hole, the second connecting hole, the first connecting port, the second connecting port, the third flow channel in sequence, and finally sprays out to the abutment and friction point between the top and the center hole.

[0027] A process for processing a valve stem of a track ball valve comprises the following steps:

[0028] S1: Casting, forming valve stem blank;

[0029] S2: Turning, processing to specified size;

[0030] S3: grinding, using the above-mentioned processing device to perform grinding operations;

[0031] S4: milling, forming spiral grooves and keyways;

[0032] S5: Wire cutting, forming wedge-shaped surface;

[0033] S6: Chrome plating, chrome plating on the wedge surface;

[0034] S7: polishing;

[0035] S8: Inspection.

[0036] In summary, this application includes at least one of the following beneficial technical effects:

[0037] 1. The adjustment plate is driven by a screw to slide, which drives the grinding wheel to slide towards or away from the valve stem, so that the grinding wheel can transition from the large diameter section of the valve stem to the small diameter section. Compared with traditional manual adjustment, it is safer and helps to improve the degree of automation of the device.

[0038] 2. This application uses the positioning block to adjust the position of the linkage block to adjust the sliding distance of the sliding rod to adapt to the sizes of different valve stem center holes. By adjusting the position of the linkage block by the positioning block and limiting the rotation of the top by the limiting block, the rotation state of the top can be changed. When the top is not rotating, the valve stem with high processing precision requirements can be processed. When the top is rotating, the workpiece with relatively low processing precision requirements can be processed.

[0039] 3. When the top does not rotate, the positioning accuracy of the valve stem is higher, but the friction force is greater, and overheating may occur. The position of the linkage block is adjusted by the positioning block so that the friction block does not contact the conical surface of the center hole. The linkage block moves a small distance, causing the friction block to deflect at a certain angle. Lubricating fluid is introduced into the cooling pipe, and the lubricating fluid is sprayed to lubricate and cool the abutting friction point between the top and the center hole to prevent overheating, which may cause the workpiece to bend or "burn" the center hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Schematic diagram of the overall structure of the valve stem;

[0041] Figure 2 This is a schematic diagram of the overall structure of the processing device embodiment 1 of the present application;

[0042] Figure 3 This is a partial structural diagram of the first embodiment of the processing device of this application, which mainly reflects the top structure;

[0043] Figure 4 This is a schematic cross-sectional view of the top structure of the processing device in Example 1 of this application, which mainly reflects the structure of the linkage block;

[0044] Figure 5 This is a partial structural diagram of the second embodiment of the processing device of this application, which mainly reflects the structure of the positioning block;

[0045] Figure 6 for Figure 5 The partial enlarged view of A in the middle mainly shows the structure of the locking bolt;

[0046] Figure 7 A partial structural cross-sectional view of the third embodiment of the processing device of the present application, mainly showing the structures of the first flow channel, the second flow channel and the third flow channel;

[0047] Figure 8 The schematic cross-sectional structure diagram of the sliding rod in the third embodiment of the processing device of the present application mainly reflects the structure of the hinged rod;

[0048] Figure 9 for Figure 7 The partial enlarged view of B in the middle mainly shows the structure of the first communication port and the second communication port;

[0049] Figure 10 This is a partial structural diagram of Example 3 of the processing device of the present application, which mainly reflects the structure of the first limiting plate, the second limiting plate and the limiting block.

[0050] Reference numerals: 1, body; 11, first slide groove; 2, slide plate; 21, adjustment plate; 22, second slide groove; 23, transmission screw; 3, three-jaw chuck; 4, center; 41, slide groove; 411, limit groove; 412, slide groove; 42, tapered surface; 421, receiving groove; 422, avoidance opening; 43, countersunk head; 431, threaded hole; 5, grinding wheel; 6, slide seat; 61, mounting sleeve; 611, accommodating space; 612, first limit plate; 62, rotating block; 63, connecting rod; 631, abutting plate; 6 32. Compression spring; 633. Second limiting plate; 64. Linkage block; 641. Limiting block; 642. First connecting hole; 7. Sliding rod; 71. Support plate; 711. Connecting hole; 72. Articulated rod; 721. Second connecting hole; 722. First connecting port; 8. Friction block; 81. Rotating sleeve; 811. Second connecting port; 9. Positioning block; 91. Sliding portion; 10. Locking bolt; 20. Cooling pipe; 30. First flow channel; 40. Second flow channel; 50. Third flow channel; 60. Limiting block; 601. Limiting groove. DETAILED DESCRIPTION

[0051] The following is combined with Figure 2 -Attached Figure 10 This application is described in further detail.

[0052] The present application discloses a device for processing a valve stem of a track ball valve.

[0053] Example 1

[0054] Reference Figure 2 The processing device of the valve stem of the track ball valve includes a machine body 1, a sliding plate 2, a three-jaw chuck 3, a top 4 and a grinding wheel 5. The three-jaw chuck 3 is installed on the machine body 1, and a sliding seat 6 is slidingly provided on the machine body 1. The top 4 is provided on the sliding seat 6. The three-jaw chuck 3 and the top 4 can cooperate to realize the positioning of the valve stem; the sliding plate 2 is provided on the machine body 1, and an adjusting plate 21 is also slidingly provided on the sliding plate 2. The sliding direction of the adjusting plate 21 is perpendicular to the sliding plate 2, and the grinding wheel 5 is installed on the adjusting plate 21.

[0055] Specifically, a first slide groove 11 is formed on the machine body 1, and the sliding plate 2 and the sliding seat 6 both slide in cooperation with the first slide groove 11, and the sliding plate 2 is located between the sliding seat 6 and the three-jaw chuck 3. The sliding of the sliding plate 2 and the sliding seat 6 is achieved by a motor-driven screw transmission, which will not be elaborated here; the sliding plate 2 is provided with a second slide groove 22, and the second slide groove 22 is perpendicular to the length direction of the first slide groove 11. A transmission screw 23 is rotatably connected to the sliding plate 2, and the adjustment plate 21 is threadedly connected to the transmission screw 23. The transmission screw 23 is driven by a servo motor, and the grinding wheel 5 is installed on the adjustment plate 21, and the grinding wheel 5 is rotated by a motor.

[0056] The machining process follows: First, a three-jaw chuck 3 clamps one end of the valve stem, while a tip 4 slides against the center hole of the other end to achieve bidirectional fixation. A screw-driven adjustment plate 21 then drives a grinding wheel 5 into contact with the valve stem surface. The polishing operation is completed through the synergistic effect of the valve stem's rotation and the grinding wheel 5's rotation.

[0057] During machining, the sliding plate 2 moves axially along the valve stem to achieve full-length grinding. When the grinding wheel 5 reaches the diameter change section, a screw adjusts its position, ensuring a smooth transition between different diameter zones. Compared to traditional manual adjustment methods, this device uses a motor-driven screw to precisely control the position of the grinding wheel 5, significantly improving operational safety and significantly enhancing the level of machining automation. This design effectively solves the technical challenges of grinding the valve stem's variable diameter section, ensuring consistent machining quality.

[0058] Reference Figure 2 、 Figure 3 and Figure 4 The sliding seat 6 is fixedly connected to a mounting sleeve 61. A rotating block 62 is rotatably connected to the mounting sleeve 61 via a bearing. A connecting rod 63 is fixedly connected to the rotating block 62. A linkage block 64 is provided at the end of the connecting rod 63. A sliding groove 41 is provided in the top 4. The linkage block 64 slides and cooperates with the sliding groove 41. A limiting block 641 is fixedly connected to the circumference of the linkage block 64. A limiting groove 411 is provided on the inner wall of the sliding groove 41. The limiting block 641 slides and cooperates with the limiting groove 411. The cooperation between the limiting block 641 and the limiting groove 411 enables the coaxial rotation of the top 4 and the connecting rod 63, thereby achieving the rotational cooperation between the top 4 and the mounting sleeve 61. An abutment plate 631 is provided on the connecting rod 63, and a compression spring 632 is sleeved on the connecting rod 63. One end of the compression spring 632 abuts the end surface of the top 4, and the other end abuts the abutment plate 631.

[0059] A conical surface 42 is formed at the front end of the top 4, and a sliding rod 7 is slidingly connected inside the top 4. The sliding rod 7 is located in the limiting groove 411, and the end of the sliding rod 7 is provided with a friction block 8 that is adapted to the shape of the conical surface 42. The friction block 8 is hinged to the sliding rod 7 through a torsion spring, and the end of the sliding rod 7 away from the friction block 8 is fixedly connected to the limiting block 641.

[0060] In the initial state, the friction block 8 is completely embedded in the conical working surface of the top 4 to form an integral contact surface. When the top 4 is connected to the center hole of the valve stem, two working states will appear: if the angle of the conical surface of the valve stem center hole matches the angle of the conical surface of the top 4, the two directly form a surface contact friction pair, and synchronous rotation is achieved through the static friction between the conical surfaces; if the conical angle of the valve stem center hole is large, resulting in a fitting clearance, when the top 4 abuts the center hole, the sliding seat 6 continues to slide, and the sliding rod 7 pushes the friction block 8 to produce radial displacement, so that the front end of the friction block 8 first contacts the conical surface of the center hole. As the sliding continues, the friction block 8 deflects at an angle until it is completely fitted with the conical surface of the center hole. The wedge-shaped contact structure established at this time generates sufficient normal contact force to form a reliable friction transmission. In this process, the top 4 is supported by the bearing to achieve synchronous rotation with the valve stem, and the main friction effect is transferred to the bearing assembly, which effectively avoids the direct friction loss between the center hole and the top 4, thereby significantly improving the service life of the transmission components and the system reliability.

[0061] When the top 4 abuts against the center hole, if the sliding seat 6 continues to slide, the compression spring 632 is compressed, and the force of the compression spring 632 acts on the top 4, making the abutment between the top 4 and the center hole more reliable.

[0062] A receiving groove 421 for receiving the friction block 8 is provided on the conical surface 42 of the tip 4. In the initial state, the friction block 8 is accommodated in the receiving groove 421. A relief opening 422 for escaping the sliding rod 7 is provided on the bottom wall of the receiving groove 421.

[0063] The top 4 is fixedly connected to the inner wall of the sliding groove 41 with a positioning block 9 , which limits the position of the linkage block 64 .

[0064] After the tip 4 is aligned with the valve stem center hole, the linkage block 64 continues to move until it contacts the positioning block 9, at which point the friction block 8 has fully compressed the tapered surface of the center hole. This structural design provides rigid positioning, effectively suppressing potential axial movement during the grinding process and ensuring the stability of the tip 4 on the connecting rod 63, thereby maintaining the machining and positioning accuracy of the valve stem. This mechanical interlocking mechanism limits the axial freedom of the tip 4, preventing displacement deviation caused by cutting forces and helping to improve grinding quality.

[0065] The implementation principle of the processing device of the valve stem of a track ball valve in the embodiment of the present application is: the valve stem is positioned and clamped by a three-jaw chuck 3 and a top 4, and then the adjusting plate 21 slides to drive the grinding wheel 5 to contact the surface of the valve stem. The valve stem can be polished by the joint rotation of the valve stem and the grinding wheel 5. During the processing, the sliding plate 2 drives the grinding wheel 5 to move along the length direction of the valve stem to realize the polishing of the entire valve stem. When the grinding wheel 5 moves to the connection between the ends of different diameters of the valve stem, the screw drives the adjusting plate 21 to slide, adjusts the position of the grinding wheel 5, and thereby realizes the transition of the grinding wheel 5 from the large diameter section to the small diameter section; compared with the traditional manual adjustment method, it is safer and the degree of automation of the processing device is higher.

[0066] Example 2

[0067] Reference Figure 5 and Figure 6 The difference between this embodiment and embodiment 1 is that a sliding groove 412 is provided on the inner wall of the sliding groove 41 of the top 4, the positioning block 9 slides in cooperation with the sliding groove 412, and a locking member is provided on the top 4 to lock the position of the positioning block 9.

[0068] The sliding groove 412 penetrates to the outer wall of the top 4, and the top 4 has a countersunk head 43 formed at the notch of the sliding groove 412, and the countersunk head 43 has a threaded hole 431. A sliding portion 91 is formed on the positioning block 9, and the locking piece is configured as a locking bolt 10, which passes through the sliding portion 91 and is threadedly connected to the threaded hole 431.

[0069] The tapers of different valve stem center holes are different. By adjusting the position of the linkage block 64 through the position of the positioning block 9, the moving distance of the sliding rod 7 can be controlled, and then the position of the friction plate can be adjusted to adapt to the abutment of different center holes.

[0070] Example 3

[0071] Reference Figure 7 、 Figure 8 、 Figure 9 and Figure 10 The difference between this embodiment and embodiment 2 is that the side of the rotating block 62 away from the connecting rod 63 is connected to the cooling pipe 20 through a rotating joint, a first flow channel 30 is opened in the connecting rod 63, the cooling pipe 20 is connected to the first flow channel 30, a second flow channel 40 is opened in the sliding rod 7, the first flow channel 30 is connected to the second flow channel 40, a third flow channel 50 is opened in the friction block 8, the outlet of the third flow channel 50 is located on the side of the friction block 8 close to the end of the top 4, and the second flow channel 40 is connected to the third flow channel 50; a limiting member that limits the rotation of the rotating block 62 is provided on the mounting sleeve 61.

[0072] The ends of the sliding rod 7 are oppositely provided with support plates 71, and a hinge rod 72 is provided between the two support plates 71. A rotating sleeve 81 is provided on one side of the friction block 8, and the rotating sleeve 81 is hinged to the hinge rod 72 through a torsion spring; a first connecting hole 642 communicating with the first flow channel 30 is provided in the linkage block 64, and the other end of the first connecting hole 642 is communicated with the second flow channel 40; a second connecting hole 721 is provided in the hinge rod 72, and a connecting hole 711 is provided in the support plate 71, and the connecting hole 711 is used to connect the first flow channel 30. The second flow channel 40 and the second connecting hole 721, the hinged rod 72 is provided with a first connecting port 722 connected to the second connecting hole 721, the inner wall of the rotating sleeve 81 is provided with a second connecting port 811 connected to the first connecting port 722, the second connecting port 811 is connected to the third flow channel 50, the diameter of the first connecting port 722 is smaller than the diameter of the second connecting port 811, when the rotating sleeve 81 rotates relative to the hinged rod 72, the second connecting port 811 always covers the first connecting port 722.

[0073] To enhance positioning stability during high-precision valve stem machining, this device utilizes a static locking mode for tip 4. When machining with high precision is required, a restraining member secures rotating block 62, keeping tip 4 stationary. Positioning block 9 is then adjusted so that when linkage block 64 abuts against it, friction block 8 avoids contact with the tapered surface of the center hole, significantly reducing friction between tip 4 and the workpiece. In this state, linkage block 64, acting under the action of the torsion spring, produces a slight displacement, causing the lower end of friction block 8 to produce a slight outward deflection angle.

[0074] Then, the lubricating liquid is introduced into the cooling pipe 20, and the lubricating liquid enters the first flow channel 30 from the cooling pipe 20, and then passes through the first connecting hole 642, the second flow channel 40, the connecting hole 711, the second connecting hole 721, the first connecting port 722, the second connecting port 811, and the third flow channel 50 in sequence, and finally sprayed to the abutting friction point between the top 4 and the center hole, lubricating and cooling the abutting point between the top 4 and the center hole, thereby reducing friction and preventing the workpiece from being bent or the center hole from being "burned" due to overheating.

[0075] An annular accommodating space 611 is formed on one side of the mounting sleeve 61 near the tip 4. A first limiting piece 612 is fixedly connected to the inner wall of the accommodating space 611 of the mounting sleeve 61. A second limiting piece 633 is fixedly connected to the connecting rod 63. The limiting member is provided as a limiting block 60, which is plugged into and matched with the accommodating space 611. The limiting block 60 is formed with a limiting groove 601 that plugs into and matches the first limiting piece 612 and the second limiting piece 633. When high precision is required for valve stem machining, the limiting block 60 is plugged into the accommodating space 611, and the limiting block 60 is plugged into and matched with the first limiting piece 612 and the second limiting piece 633, thereby achieving relative fixation of the connecting rod 63 and the mounting sleeve 61, that is, locking the rotation of the tip 4.

[0076] The present application discloses a process for processing a valve stem of a track ball valve, comprising the following steps:

[0077] S1: Casting, forming valve stem blank;

[0078] S2: Turning, processing to specified size;

[0079] S3: grinding, using the processing device in any of the above embodiments to perform grinding operations;

[0080] S4: milling, forming spiral grooves and keyways;

[0081] S5: Wire cutting, forming wedge-shaped surface;

[0082] S6: Chrome plating, chrome plating on the wedge surface;

[0083] S7: polishing;

[0084] S8: Inspection.

[0085] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A processing device for a track ball valve stem, characterized by: The invention comprises a machine body (1), a sliding plate (2), a three-jaw chuck (3), a top (4) and a grinding wheel (5), wherein the top (4) is slidingly arranged on the machine body (1), the three-jaw chuck (3) and the top (4) cooperate to position the valve stem, the sliding plate (2) is slidingly arranged on the machine body (1), an adjusting plate (21) is also slidingly arranged on the sliding plate (2), the sliding directions of the sliding plate (2) and the adjusting plate (21) are vertical, a transmission screw (23) is rotatably arranged on the sliding plate (2), the adjusting plate (21) is threadedly connected to the transmission screw (23), and the grinding wheel (5) is mounted on the adjusting plate (21); A sliding seat (6) is slidably provided on the body (1), a mounting sleeve (61) is fixedly connected to the sliding seat (6), and the top (4) is rotatably provided on the mounting sleeve (61); a conical surface (42) is formed at the front end of the top (4), a sliding rod (7) is slidably provided inside the top (4), a friction block (8) having a shape adapted to the conical surface (42) is provided at the end of the sliding rod (7), and the friction block (8) is hinged to the sliding rod (7) via a torsion spring; A rotating block (62) is rotatably connected to the mounting sleeve (61) via a bearing, a connecting rod (63) is fixedly provided on the rotating block (62), and a linkage block (64) is fixedly connected to the end of the connecting rod (63), a sliding groove (41) is provided in the top (4), the linkage block (64) is slidably matched with the sliding groove (41), and a limiting block (641) is provided on the circumferential side of the linkage block (64), and a limiting groove is provided on the inner wall of the sliding groove (41). (411), the limit block (641) is slidably engaged with the limit groove (411); the end of the sliding rod (7) away from the friction block (8) is fixedly connected to the limit block (641); an abutment plate (631) is provided on the connecting rod (63), and a compression spring (632) is sleeved on the connecting rod (63), one end of the compression spring (632) abuts against the end face of the top (4), and the other end of the compression spring (632) abuts against the abutment plate (631).

2. The processing device for a track ball valve stem according to claim 1, characterized in that: The top (4) is provided with a positioning block (9) on the inner wall of the sliding groove (41), and the positioning block (9) limits the moving position of the linkage block (64).

3. The processing device for a track ball valve stem according to claim 2, characterized in that: The top (4) is provided with a sliding groove (412) on the inner wall of the sliding groove (41), the positioning block (9) is slidingly engaged with the sliding groove (412), and the top (4) is provided with a locking piece for locking the position of the positioning block (9).

4. The processing device for a track ball valve stem according to claim 3, characterized in that: The sliding groove (412) is opened through, and the outer wall of the top (4) is formed with a countersunk head (43) at the notch of the sliding groove (412), and a plurality of threaded holes (431) are opened at the countersunk head (43). A sliding portion (91) is formed on the positioning block (9), and the locking member is configured as a locking bolt (10), and the locking bolt (10) passes through the sliding portion (91) and is threadedly connected to the threaded hole (431).

5. The processing device for a track ball valve stem according to claim 3, characterized in that: The side of the rotating block (62) away from the connecting rod (63) is connected to the cooling pipe (20) through a rotating joint, the connecting rod (63) is provided with a first flow channel (30), the cooling pipe (20) is communicated with the first flow channel (30), the sliding rod (7) is provided with a second flow channel (40), the first flow channel (30) is communicated with the second flow channel (40), the friction block (8) is provided with a third flow channel (50), the outlet of the third flow channel (50) is located on the side of the friction block (8) close to the end of the top (4), the second flow channel (40) is communicated with the third flow channel (50); the mounting sleeve (61) is provided with a limiting member for limiting the rotation of the rotating block (62).

6. The processing device for a track ball valve stem according to claim 5, characterized in that: An annular accommodating space (611) is formed on one side of the mounting sleeve (61) close to the top (4), a first limiting piece (612) is provided on the mounting sleeve (61) in the accommodating space (611), a second limiting piece (633) is provided on the connecting rod (63), the limiting member is configured as a limiting block (60), the limiting block (60) is plugged into the accommodating space (611), and a limiting groove (601) is formed on the limiting block (60) to be plugged into the first limiting piece (612) and the second limiting piece (633).

7. The processing device for a track ball valve stem according to claim 5, characterized in that: The ends of the sliding rod (7) are oppositely provided with support plates (71), and a hinge rod (72) is provided between the two support plates (71). A rotating sleeve (81) is formed on one side of the friction block (8), and the rotating sleeve (81) and the hinge rod (72) are hinged via a torsion spring; a first connecting hole (642) is provided in the linkage block (64), one end of the first connecting hole (642) is communicated with the first flow channel (30), and the other end of the first connecting hole (642) is communicated with the second flow channel (40); the hinge rod ( A second connecting hole (721) is provided in the support plate (72), a communicating hole (711) is provided in the support plate (71), the communicating hole (711) is used to connect the second flow channel (40) and the second connecting hole (721), a first communicating port (722) communicating with the second connecting hole (721) is provided on the hinge rod (72), a second communicating port (811) communicating with the first communicating port (722) is provided on the rotating sleeve (81), and the second communicating port (811) is connected to the third flow channel (50).

8. A process for processing a valve stem of a track ball valve, characterized by: The steps include: S1: Casting, forming valve stem blank; S2: Turning, processing to specified size; S3: grinding, using the processing device according to any one of claims 1 to 7 to perform grinding operations; S4: milling, forming spiral grooves and keyways; S5: Wire cutting, forming wedge-shaped surface; S6: Chrome plating, chrome plating on the wedge surface; S7: polishing; S8: Inspection.

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