A turning device for an elongated valve stem

Abstract

The present application discloses a turning device for an elongated valve stem, which relates to the field of valve stem processing. It includes a machine body, on which a three-jaw chuck, a center and a tool rest are arranged. A sliding seat is slidably arranged on the machine body, and the tool rest is located on the sliding seat. The tool rest is located on the upper side of the valve stem. Supporting wheels are symmetrically arranged on one side of the center of the machine body, and the two supporting wheels support the valve stem. A mounting plate is arranged on the machine body in a lifting manner, and a leveling wheel is rotatably connected to the mounting plate. Sliding plates are slidably arranged on both sides of the mounting plate of the machine body, and supporting rods are arranged on the two sliding plates in a lifting manner. A universal supporting ball is installed at the upper end of the supporting rod. This application helps to improve the processing quality of the elongated valve stem.

Description

Technical Field

[0001] This application relates to the field of valve stem processing, and particularly to a turning device for a slender valve stem. Background Art

[0002] As the opening and closing actuator of valve components, the valve stem plays a crucial role.

[0003] Currently, the turning process of the valve stem is carried out using a lathe. One end of the valve stem is fixed by a three-jaw chuck, and the other end is abutted by a center. The three-jaw chuck drives the valve stem to rotate, and the turning tool abuts against the valve stem. The turning tool travels along the length direction of the valve stem, and thus the turning of the valve stem can be achieved.

[0004] However, for some slender valve stems, during the turning operation on the lathe, due to their slender characteristics, the support points of the lathe for the valve stem are relatively far away. One reason is the self-gravity of the valve stem itself, and the other reason is the acting force of the turning tool on the valve stem. Eventually, the valve stem will bend, affecting the processing quality of the valve stem. Summary of the Invention

[0005] In order to improve the processing quality of the valve stem, this application provides a turning device for a slender valve stem.

[0006] The turning device for a slender valve stem provided by this application adopts the following technical solution:

[0007] A turning device for a slender valve stem includes a machine body. A three-jaw chuck, a center, and a tool post are arranged on the machine body. A slide seat is slidably arranged on the machine body. The tool post is located on the slide seat. The tool post is located above the valve stem. Supporting wheels are symmetrically arranged on one side of the machine body where the center is located. The two supporting wheels support the valve stem. A mounting plate is arranged on the machine body in a lifting manner. A leveling wheel is rotatably connected to the mounting plate. Slide plates are slidably arranged on both sides of the machine body where the mounting plate is located. Supporting rods are arranged on the two slide plates in a lifting manner. A universal supporting ball is installed at the upper end of the supporting rod.

[0008] By adopting the above technical solution, the staff fixes one end of the valve stem to the three-jaw chuck and lapps the other end on the supporting wheel. Subsequently, the leveling wheel rises and is located at the middle position of the valve stem. If the valve stem bends due to gravity, the bending point is also at the middle position. By using the rising of the leveling wheel, the leveling wheel drives the valve stem to move, so that the valve stem remains in a horizontal state. Subsequently, the center point touches the other end of the valve stem, and the universal support ball rises to abut against the valve stem. After that, the three-jaw chuck rotates to drive the valve stem to rotate, and the carriage drives the turning tool on the tool holder to move, so that turning operation can be carried out on the valve stem. In practice, the turning tool travels from the center point side to the three-jaw chuck direction. The universal support ball located on the side close to the center point is located below the turning tool and supports the valve stem. When the turning tool moves, the sliding plate synchronously drives the corresponding universal support ball to move, and the universal support ball supports the turning position of the turning tool, which can prevent the valve stem from having radial runout during the processing; when the turning tool moves to the middle position, the sliding plate on one side stops sliding. When the turning tool moves beyond the middle position to the other side, the corresponding sliding plate drives the corresponding universal support ball to move, which can ensure the supporting effect on the turning point during the turning process. When the turning tool moves to the middle position of the valve stem, the leveling wheel will support the valve stem. That is, during the travel of the turning tool, the valve stem is supported by two universal support balls and the leveling wheel, which helps to prevent the valve stem from bending and thus helps to improve the turning quality.

[0009] Preferably, a first lead screw is rotatably connected to the machine body in the horizontal direction, the carriage is threadedly connected to the first lead screw, a driving motor for driving the first lead screw to rotate is arranged on the machine body, a linkage rod is fixedly installed on the carriage, the linkage rod is arranged vertically, a linkage groove is formed on the sliding plate, the linkage rod extends into the linkage groove, and the linkage groove is arranged with one side open. The openings of the linkage grooves of the two sliding plates are arranged oppositely. A baffle is hinged in the linkage groove, a rotating tooth is integrally formed on one side of the baffle, a locking tooth is arranged on the sliding plate in a lifting manner. In the initial state, the locking tooth is engaged with the rotating tooth. A plugging rod is arranged on the machine body, a rack portion is formed at one end of the plugging rod, a plugging groove for plugging and matching with the plugging rod is formed on the sliding plate, and the rotating tooth extends into the plugging groove; when the sliding plate slides and is plugged with the plugging rod, the locking tooth rises to release the locking of the rotating tooth. Subsequently, the rack portion of the plugging rod is engaged with the rotating tooth and drives the baffle to rotate, and then the linkage rod disengages from the linkage groove.

[0010] By adopting the above technical solution, the driving motor drives the first lead screw to rotate, and the first lead screw drives the slide seat to slide horizontally; in the initial state, the slide seat is located on the side close to the center, and the linkage rod extends into the linkage groove of the slide plate on the side close to the center, and at this time the baffle plate blocks the linkage groove, and the baffle plate cooperates with the bottom wall of the linkage groove to limit the linkage rod. At this time, when the slide seat slides, the slide plate can be driven to slide synchronously through the linkage rod, ensuring that the supporting point of the universal support ball on the valve stem is always below the turning tool, thereby helping to prevent the valve stem from moving; when the slide plate slides, the insertion rod will enter the insertion groove, and at this time the locking tooth rises and disengages from the rotating tooth, releasing the locking of the rotating tooth, that is, the locking tooth can rotate at this time. Driven by the rack part of the insertion rod, the rotating tooth rotates, the baffle plate gradually rotates, and the limit on the linkage rod is released. The linkage rod can slide out of the linkage groove and disengage from the slide plate. This slide plate no longer slides with the linkage rod. At this time, the turning tool moves to the middle position of the valve stem; the slide plate on the other side is in an inserted state with the corresponding insertion rod, and the baffle plate is in a rotating state. During the sliding process of the turning tool, the linkage rod enters the linkage groove of this slide plate, and then the slide plate abuts against the bottom wall of the linkage groove, driving this slide plate to slide synchronously. After sliding, the insertion rod gradually disengages from the insertion groove and drives the rotating tooth to rotate, that is, the baffle plate rotates to limit the linkage rod, and the locking tooth descends to lock the rotating tooth. At this time, the baffle plate cannot rotate, and the turning tool continues to slide. The universal support ball on this side will move with the movement of the turning tool; when the turning is completed, the first lead screw rotates reversely, driving the slide seat and the turning tool to reset. The linkage rod first drives the slide plate on the side close to the three-jaw chuck to slide until the slide plate and the insertion rod are inserted, and then the baffle plate will gradually rotate, the linkage rod disengages from it and gradually cooperates with the other slide plate, and drives the slide plate to reset.

[0011] Preferably, a lifting groove is formed in the sliding plate in the vertical direction. The lower end of the lifting groove communicates with the insertion groove. A first wedge block is arranged in the lifting groove of the sliding plate to lift and slide. The locking teeth are located below the first wedge block. A through groove is formed in the first wedge block. A first wedge surface is formed on the inner wall of the through groove of the first wedge block. A second wedge block is arranged on the machine body. There are two second wedge blocks corresponding to the two sliding plates. A sliding groove is formed in the sliding plate in the horizontal direction. The sliding groove communicates with the lifting groove. The second wedge block is inserted into and slidably engaged with the sliding groove. A second wedge surface is formed on the side of the second wedge block close to the sliding plate. When the sliding plate slides towards the side close to the second wedge block, the second wedge block is inserted into the sliding groove, and the second wedge block enters the through groove of the first wedge block. Under the cooperation of the first wedge surface and the second wedge surface, the first wedge block rises, and the locking teeth and the rotating teeth are disengaged. An abutting ring plate is arranged on the periphery of the first wedge block. An abutting groove is formed in the sliding plate in the lifting groove. The abutting ring plate is located in the abutting groove. A return spring is arranged in the abutting groove of the sliding plate. One end of the return spring is connected to the abutting ring plate, and the other end of the return spring is connected to the inner wall of the abutting groove.

[0012] By adopting the above technical solution, when the sliding seat slides towards the middle of the valve stem, that is, when the sliding seat drives the corresponding sliding plate to slide towards the middle position of the valve stem through the linkage rod, the sliding plate will be inserted into the corresponding second wedge block. The second wedge block is inserted into and slidably engaged with the sliding groove, and the second wedge block will pass through the through groove of the first wedge block. Subsequently, under the cooperation of the first wedge surface and the second wedge surface, the first wedge block rises, that is, the locking teeth and the rotating teeth are disengaged. Then, the rack portion of the insertion block cooperates with the rotating teeth to drive it to rotate. When the sliding seat drives the sliding plate to slide in the reverse direction, the rack portion drives the rotating teeth to rotate, so that the baffle plate is reset. Subsequently, the second wedge block is disengaged from the first wedge block. Under the action of the return spring, the first wedge block descends and resets, and the locking teeth lock the rotating teeth.

[0013] Preferably, two leveling wheels are also rotatably connected to the mounting plate. The highest points of the leveling wheels and the leveling wheels are on the same horizontal line. The two leveling wheels are located on both sides of the leveling wheel. A first chute is radially formed in the inner edge of the leveling wheel. A leveling block slides in the first chute of the leveling wheel. A first annular groove is also formed in the first chute of the leveling wheel. A first abutting plate is arranged on the circumferential side of the leveling block. The first abutting plate is located in the first annular groove. A first compression spring is arranged in the first annular groove of the leveling wheel. One end of the first compression spring is connected to the inner wall of the first annular groove, and the other end of the first compression spring is connected to the first abutting plate. A contact switch is installed on the bottom wall of the first chute of the leveling wheel, and an indicator light is installed on the side of the leveling wheel. The indicator light is electrically connected to the contact switch. When the leveling block slides and contacts the contact switch, the contact switch controls the indicator light to turn on. A locking component for locking the position of the leveling block is arranged in the leveling block. A counterweight part is formed on the leveling wheel. Under the action of the counterweight part, the leveling block is vertically arranged.

[0014] By adopting the above technical solution, in the initial state, under the action of the counterweight part, the leveling block is in a vertical state and extends out of the surface of the leveling wheel. When performing the leveling operation, the mounting plate rises, and the leveling wheel will contact the middle position of the valve rod. If the valve rod bends due to gravity, the leveling wheel can rise to level the valve rod. Since the leveling block is in a rising state, the leveling block will also contact the valve rod. During the rising process of the mounting plate, the leveling block is gradually lowered under the pressure of the valve rod. When the leveling block completely enters the first chute, the locking component will lock the leveling block. And at this time, it means that the valve rod is lapped on two leveling wheels and one leveling wheel, that is, the valve rod is in a horizontal state and is not bent at this time. At the same time, when the leveling block completely enters the first chute, the leveling block contacts the contact switch, and the contact switch controls the indicator light to light up, prompting the staff that the leveling work of the valve rod is completed, and then the subsequent turning operation can be carried out.

[0015] Preferably, the locking component includes a third wedge block. A second chute is horizontally formed in the leveling wheel. The third wedge block is slidably arranged in the second chute. The second chute is communicated with the first chute. A third wedge surface is formed at the end of the third wedge block. A locking groove is formed on the leveling block. The third wedge block is inserted into the locking groove to lock the leveling block. A second annular groove is formed on the circumferential side of the second chute of the leveling wheel. A second abutting plate is integrally formed on the circumferential side of the third wedge block. A second compression spring is arranged in the second annular groove of the leveling wheel. One end of the second compression spring is connected to the inner wall of the second annular groove, and the other end of the second compression spring is connected to the second abutting plate.

[0016] By adopting the above technical solution, under the action of the second compression spring, the third wedge block extends into the first chute. When the leveling block gradually slides under the action of the valve stem and slides into the first chute, under the action of the third wedge surface, the leveling block drives the third wedge block to slide into the second chute. After the leveling block finishes sliding, under the action of the second compression spring, the third wedge block is inserted into the locking groove to lock the leveling block; since the valve stem rotates during the turning process, the leveling wheel rotates accordingly. By locking the leveling block, the leveling block can be prevented from extending out of the first chute.

[0017] Preferably, a second lead screw is rotatably arranged on the machine body in the vertical direction, and the mounting plate is threadedly connected to the second lead screw.

[0018] By adopting the above technical solution, when the second lead screw rotates, the lifting movement of the mounting plate can be realized.

[0019] Preferably, a fixing plate is fixedly connected to the machine body, and the fixing plate is located below the mounting plate. The locking assembly further includes a fourth wedge block. The fourth wedge block is fixedly installed on the fixing plate in the vertical direction. A third chute is radially formed on the leveling wheel, and the third chute communicates with the second chute. An unlocking groove is formed in the middle of the third wedge block, and a fourth wedge surface is formed on the inner wall of the unlocking groove of the third wedge block. A fifth wedge surface is formed at the upper end of the fourth wedge block; after turning is completed, the mounting plate descends, the fourth wedge block will enter the third chute, and the fourth wedge block is inserted into the unlocking groove. Under the action of the fourth wedge surface and the fifth wedge surface, the third wedge block slides to release the locking of the leveling block.

[0020] By adopting the above technical solution, in the initial state, the fourth wedge block is inserted and matched with the unlocking groove. At this time, the leveling block extends out of the first chute. When the mounting plate rises, the leveling wheel disengages from the fourth wedge block. Subsequently, under the action of the valve stem on the leveling block, the leveling block descends, and the third wedge block locks the leveling block.

[0021] In summary, the present application includes at least one of the following beneficial technical effects:

[0022] 1. One end of the valve stem is fixed to the three-jaw chuck, and the other end first abuts against the supporting wheel. Subsequently, the leveling wheel rises to support the middle position of the valve stem and make the valve stem in a horizontal state. Then, the center point abuts against the other end of the valve stem. After that, the universal support ball rises to abut against the valve stem. Subsequently, the slide seat drives the tool rest to slide along the length direction of the valve stem, and the universal support ball slides accordingly. The supporting point of the universal support ball and the turning point of the tool are at the same place, which can prevent the radial runout during turning, and further prevent the valve stem from bending;

[0023] 2. When the slide seat slides, the linkage rod synchronously drives the sliding plate to slide, that is, the synchronous sliding of the universal support ball is realized. Due to the existence of the mounting plate at the middle position of the valve stem, the sliding plate cannot pass over the middle of the valve stem. Therefore, when the turning tool gradually moves to the middle of the valve stem, the second wedge block slides and cooperates with the sliding groove, and drives the first wedge block to rise, so that the locking tooth and the rotating tooth are disengaged, and at the same time, the plug-in rod enters the plug-in groove, drives the rotating tooth to rotate, and the baffle plate rotates. At this time, the linkage rod is disengaged from the linkage groove, that is, it will not drive the sliding plate to slide at this time. When the slide seat passes the middle position of the valve stem, the linkage rod enters the linkage groove of the other sliding plate, and drives it to slide synchronously, and the universal support ball continues to work;

[0024] 3. The mounting plate rises, and the leveling block on the leveling wheel will first contact the valve stem, and then the mounting plate continues to rise. When the leveling block drops into the first slide slot and contacts the contact switch, the contact switch control indicator light turns on, indicating that the valve stem is in a horizontal state. When the valve stem is bent, its middle position is in a "V" shape. If the valve stem and the upper sides of the leveling wheel and the two leveling wheels are in contact, it means that the valve stem is in a horizontal state. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0026] Figure 2 A top view of the sliding plate in the embodiment of the present application;

[0027] Figure 3 This is a front view cross-sectional view of the sliding plate in the embodiment of the present application;

[0028] Figure 4 It is a partial structural schematic diagram of an embodiment of the present application, mainly showing the structure of the baffle and the first wedge-shaped block;

[0029] Figure 5 This is a partial structural diagram of an embodiment of the present application, which mainly reflects the structure of the baffle and the plug-in rod;

[0030] Figure 6 This is a partial structural diagram of an embodiment of the present application, which mainly reflects the structure of the leveling wheel;

[0031] Figure 7 It is a cross-sectional view of the leveling wheel in the embodiment of the present application, and shows the state where the leveling block enters the first slide groove;

[0032] Figure 8 It is a partial structural diagram of an embodiment of the present application, which mainly reflects the structure of the third wedge block and the fourth wedge block.

[0033] Reference signs: 1, machine body; 11, three-jaw chuck; 12, center; 13, tool rest; 14, supporting wheel; 15, first lead screw; 16, drive motor; 17, second lead screw; 171, fixing plate; 18, guide rod; 2, slide seat; 21, linkage rod; 3, mounting plate; 31, leveling wheel; 4, sliding plate; 41, linkage groove; 42, baffle; 421, rotating tooth; 43, lifting groove; 431, abutting groove; 432, return spring; 44, first wedge block; 441, locking tooth; 442, passing groove; 443, first wedge surface; 444, abutting ring plate; 45, inserting groove; 46, sliding groove; 5, supporting rod; 51, universal supporting ball; 6, inserting rod; 61, rack portion; 7, second wedge block; 71, second wedge surface; 8, leveling wheel; 81, first sliding groove; 811, contact switch; 82, first annular groove; 821, first compression spring; 83, indicator light; 84, counterweight portion; 85, second sliding groove; 86, second annular groove; 861, second compression spring; 87, third sliding groove; 9, leveling block; 91, first abutting plate; 92, locking groove; 10, locking assembly; 101, third wedge block; 1011, third wedge surface; 1012, second abutting plate; 1013, unlocking groove; 1014, fourth wedge surface; 102, fourth wedge block; 1021, fifth wedge surface. Detailed implementation manners

[0034] The following further elaborates on this application Figures 1 - 8 in conjunction with the attached drawings.

[0035] The embodiment of this application discloses a turning device for an elongated valve stem.

[0036] Referring to Figure 1 , the turning device for the elongated valve stem includes a machine body 1. A three-jaw chuck 11, a center 12, and a tool rest 13 are installed on the machine body 1. Since the three-jaw chuck 11, the center 12, and the tool rest 13 are all conventional components of a lathe, no further elaboration will be made here. A slide seat 2 is slidably connected to the machine body 1, and the tool rest 13 is installed on the slide seat 2. The slide seat 2 and the tool rest 13 are located above the valve stem. On one side of the center 12 of the machine body 1, supporting wheels 14 are symmetrically installed. The two supporting wheels 14 are used to pre-support the valve stem. A mounting plate 3 is arranged on the machine body 1 in a lifting manner, and a leveling wheel 31 is rotatably connected to the mounting plate 3; on both sides of the machine body 1 where the mounting plate 3 is located, sliding plates 4 are slidably arranged. The sliding plates 4 slide on the machine body 1 through slide rails. The sliding direction of the sliding plates 4 is parallel to the length direction of the valve stem. On both sliding plates 4, supporting rods 5 are arranged in a lifting manner. The lifting of the supporting rods 5 is driven by a cylinder (not shown in the figure). A universal supporting ball 51 is installed at the upper end of the supporting rod 5.

[0037] In practice, one end of the valve stem is fixed to the three-jaw chuck 11, and the other end is lapped on the supporting wheel 14. Then, the mounting plate 3 drives the leveling wheel 31 to rise. The leveling wheel 31 is located below the middle position of the valve stem. After the leveling wheel 31 abuts against the valve stem, it can drive the valve stem to move upward, making the valve stem in a horizontal state. Subsequently, the center drill 12 moves to abut against the end of the valve stem far from the three-jaw chuck 11. The three-jaw chuck 11 rotates, driving the valve stem to rotate. The carriage 2 drives the tool holder 13 to slide along the length direction of the valve stem, and the tool can perform turning operations on the valve stem. During the process of the tool advancing, the sliding plate 4 will drive the universal support ball 51 to move. The universal support ball 51 supports the turning position of the tool, which can prevent the valve stem from moving erratically during turning. When the tool moves to the middle position of the valve stem, the sliding plate 4 on one side stops sliding. When the tool crosses the middle position of the valve stem, the sliding plate 4 on the other side will drive the universal support ball 51 to move synchronously with the carriage 2. Through the two universal support balls 51, the turning point can be supported, reducing radial runout, which helps to prevent the valve stem from bending, that is, it helps to improve the turning quality.

[0038] Referring to Figure 1 , Figure 2 and Figure 3 , a first lead screw 15 is rotatably connected to the machine body 1 in the horizontal direction. A drive motor 16 for driving the first lead screw 15 to rotate is also installed on the machine body 1. The carriage 2 is threadedly connected to the first lead screw 15. A linkage rod 21 is fixedly installed on the carriage 2, and the linkage rod 21 is vertically arranged. The two sliding plates 4 have the same structure and are symmetrically arranged. Now, taking one of the sliding plates 4 as an example for description, a linkage groove 41 is formed in the sliding plate 4. The opening of the linkage groove 41 faces the mounting plate 3, and the linkage groove 41 is horizontally arranged. A baffle 42 is hinged in the linkage groove 41, and a rotating tooth 421 is integrally formed at the hinge point of the baffle 42.

[0039] Referring to Figure 3 and Figure 4 , a lifting groove 43 is formed in the sliding plate 4 in the vertical direction. A first wedge block 44 is lifted and slid in the lifting groove 43 of the sliding plate 4. A locking tooth 441 is integrally formed at the lower end of the first wedge block 44, and the locking tooth 441 meshes with the rotating tooth 421 to lock the baffle 42. In the initial state, with the cooperation of the baffle 42 and the inner wall of the linkage groove 41, the linkage rod 21 is limited, and the linkage rod 21 can drive the sliding plate 4 to slide synchronously.

[0040] Referring to Figure 2 , Figure 3 and Figure 4, a plugging rod 6 and a second wedge block 7 are horizontally and fixedly arranged on the machine body 1, wherein the length of the second wedge block 7 is greater than that of the plugging rod 6. A plugging groove 45 and a sliding groove 46 are horizontally formed in the sliding plate 4. The plugging rod 6 is in plugging fit with the plugging groove 45, and the second wedge block 7 is in plugging fit with the sliding groove 46. The rotating tooth 421 is located in the plugging groove 45, and the sliding groove 46 communicates with the lifting groove 43. A through groove 442 is formed in the first wedge block 44. A first wedge surface 443 is formed on the inner wall of the through groove 442 where the first wedge block 44 is located. A second wedge surface 71 is formed at one end of the second wedge block 7 close to the sliding plate 4. When the sliding plate 4 slides towards the middle of the valve rod, the second wedge block 7 is plugged and slides in the sliding groove 46 and passes through the through groove 442. Under the cooperation of the first wedge surface 443 and the second wedge surface 71, the first wedge block 44 is driven to rise, so that the locking tooth 441 and the rotating tooth 421 are disengaged, and the locking of the baffle 42 is released.

[0041] Referring to Figure 3 and Figure 5 , a rack portion 61 is formed at the end of the plugging rod 6. When the sliding plate 4 slides, the plugging rod 6 is plugged and slides in the plugging groove 45. After the locking tooth 441 and the rotating tooth 421 are disengaged, the rack portion 61 meshes with the rotating tooth 421 and drives the rotating tooth 421 to rotate, that is, drives the baffle 42 to rotate, releases the limit on the linkage rod 21, and the linkage rod 21 will slide out of the linkage groove 41 without driving the sliding plate 4 to slide.

[0042] A butting ring plate 444 is integrally formed on the periphery of the first wedge block 44. A butting groove 431 is formed in the sliding plate 4 located in the lifting groove 43. The butting ring plate 444 is located in the butting groove 431. A return spring 432 is arranged in the sliding plate 4 located in the butting groove 431. One end of the return spring 432 is connected to the butting ring plate 444, and the other end is connected to the inner wall of the butting groove 431.

[0043] When performing a turning operation, the carriage 2 initially lies on the side close to the center point 12. The carriage 2 drives the turning tool on the turning tool holder 13 to perform a turning operation on the valve stem. At this time, the linkage rod 21 on the carriage 2 is located within the linkage groove 41 of the sliding plate 4 on this side. Due to the limit of the baffle 42 on the linkage rod 21, when the carriage 2 slides, the carriage 2 will synchronously drive the sliding plate 4 to slide, that is, the universal support ball 51 always supports the turning point to prevent the valve stem from moving erratically. Due to the presence of the mounting plate 3 and the leveling wheel 31 at the middle position of the valve stem, the sliding plate 4 on this side cannot cross the middle position of the valve stem. When the carriage 2 drives the sliding plate 4 to move towards the middle of the valve stem, the insertion rod 6 and the insertion groove 45 are in insertion and sliding fit, and the second wedge block 7 and the sliding groove 46 are in insertion and sliding fit. The second wedge block 7 will first pass through the through groove 442 of the first wedge block 44. Under the cooperation of the first wedge surface 443 and the second wedge surface 71, the first wedge block 44 rises, and the locking tooth 441 and the rotating tooth 421 are disengaged, releasing the lock on the baffle 42. And at this time, the rack portion 61 of the insertion rod 6 just meshes with the rotating tooth 421. After that, when the carriage 2 moves, the linkage rod 21 will drive the baffle 42 to rotate until the linkage rod 21 disengages from the baffle 42, and then the linkage rod 21 disengages from the linkage groove 41, and then the sliding plate 4 on this side stops moving. Subsequently, the carriage 2 continues to move. At the middle position of the valve stem, the leveling wheel 31 can continue to play a supporting role. When the carriage 2 crosses the middle position of the valve stem, the linkage rod 21 enters the linkage groove 41 of the sliding plate 4 on the other side. The sliding plate 4 on this side is initially inserted with the insertion rod 6 and the second wedge block 7. After the linkage rod 21 abuts against the inner wall of the linkage groove 41, it drives the sliding plate 4 to slide synchronously. When the sliding plate 4 disengages from the insertion rod 6 and the second wedge block 7, the baffle 42 rotates, and the locking tooth 441 locks the rotating tooth 421. When the turning operation is completed, the carriage 2 slides back to its original position, driving the sliding plate 4 to slide towards the middle of the valve stem until it is inserted with the insertion rod 6 and the second wedge block 7. The baffle 42 rotates, and the linkage rod 21 disengages from the sliding plate 4. When the sliding plate 4 crosses the middle of the valve stem, the linkage rod 21 drives the sliding plate 4 on the side close to the center point 12 to slide back to its original position synchronously. The sliding plate 4 on this side disengages from the insertion rod 6 and the second wedge block 7 again, and the baffle 42 resets to limit the linkage rod 21.

[0044] Refer to Figure 1 , a second lead screw 17 is rotatably connected to the machine body 1 in the vertical direction. The mounting plate 3 is threadedly connected to the second lead screw 17. A guide rod 18 is installed on the machine body 1 in the vertical direction. The mounting plate 3 is inserted into and slidably engaged with the guide rod 18. The second lead screw 17 is driven by a handwheel to rotate the worm and worm gear, driving the rotation of the second lead screw 17.

[0045] Refer to Figure 1 , Figure 6 and Figure 7, two leveling wheels 8 are also rotatably connected to the mounting plate 3. The two leveling wheels 8 are located on both sides of the leveling wheel 31. The highest points of the leveling wheels 8 and the leveling wheel 31 are on the same horizontal line. A first sliding groove 81 is radially formed in the inner edge of the leveling wheel 8. A leveling block 9 is slidably connected in the first sliding groove 81 of the leveling wheel 8. A first annular groove 82 is also formed in the first sliding groove 81 of the leveling wheel 8. A first abutting plate 91 is integrally formed on the circumferential side of the leveling block 9. The first abutting plate 91 is located in the first annular groove 82. A first compression spring 821 is arranged in the first annular groove 82 of the leveling wheel 8. One end of the first compression spring 821 is connected to the inner wall of the first annular groove 82, and the other end is connected to the first abutting plate 91; A contact switch 811 is installed on the bottom wall of the first sliding groove 81 of the leveling wheel 8, and an indicator light 83 is installed on the side of the leveling wheel 8. The contact switch 811 is electrically connected to the indicator light 83; When the leveling block 9 slides in the first sliding groove 81 and contacts the contact switch 811, the contact switch 811 controls the indicator light 83 to light up. A counterweight portion 84 is formed on the leveling block 9. In the initial state, under the action of the counterweight portion 84, the first sliding groove 81 is arranged with the opening facing upward, and the leveling block 9 extends upward out of the first sliding groove 81. A locking assembly 10 for locking the position of the leveling block 9 is arranged in the leveling block 9.

[0046] In the initial state, the leveling block 9 extends out of the first sliding groove 81. When the mounting plate 3 rises, the leveling block 9 will contact the valve stem. If the valve stem bends due to gravity, the leveling wheel 31 can rise to level the valve stem. During the process, the valve stem acts on the leveling block 9, causing the leveling block 9 to slide into the first sliding groove 81. When the leveling block 9 completely enters the first sliding groove 81, the leveling block 9 contacts the contact switch 811 and controls the indicator light 83 to light up, indicating to the staff that the leveling action has been completed at this time, and the locking assembly 10 will lock the position of the leveling block 9 at this time. When the valve stem bends, it will be in a "V" shape in the middle of the valve stem. When the leveling block 9 completely slides into the first sliding groove 81, it means that the middle position of the valve stem abuts against the two leveling wheels 8 and the leveling wheel 31, that is, the middle position of the valve stem is in a horizontal state at this time.

[0047] Refer to Figure 7 and Figure 8, the locking assembly 10 includes a third wedge block 101. A second chute 85 is horizontally formed along the inner edge of the leveling wheel 8. The third wedge block 101 is slidably connected in the second chute 85. The second chute 85 communicates with the first chute 81. A third wedge surface 1011 is formed at the end of the third wedge block 101. A locking groove 92 is formed on the leveling block 9. A second annular groove 86 is formed on the periphery of the leveling wheel 8 around the second chute 85. A second abutting plate 1012 is integrally formed on the periphery of the third wedge block 101. A second compression spring 861 is arranged in the second annular groove 86 of the leveling wheel 8. One end of the second compression spring 861 is connected to the inner wall of the second annular groove 86, and the other end is connected to the second abutting plate 1012. When the third wedge block 101 is inserted into the locking groove 92, the leveling block 9 is locked.

[0048] Refer to Figure 1 , Figure 6 , Figure 7 and Figure 8 , a fixing plate 171 is fixedly connected to the machine body 1. The fixing plate 171 is located below the mounting plate 3. The second lead screw 17 passes through the fixing plate 171. Among them, the insertion rod 6 and the second wedge block 7 are both fixed on the fixing plate 171. The locking assembly 10 further includes a fourth wedge block 102. The fourth wedge block 102 is installed on the fixing plate 171 in the vertical direction. A third chute 87 is radially formed on the leveling wheel 8. The length direction of the third chute 87 is parallel to the length direction of the first chute 81. In the initial state, the third chute 87 is vertically downward. The third chute 87 communicates with the second chute 85. An unlocking groove 1013 is formed in the middle of the third wedge block 101. And a fourth wedge surface 1014 is formed on the inner wall of the unlocking groove 1013 of the third wedge block 101. A fifth wedge surface 1021 is formed at the upper end of the fourth wedge block 102. After the turning operation is completed, the mounting plate 3 descends, the leveling wheel 8 is separated from the valve stem. Under the action of the counterweight part 84, the third chute 87 is vertically downward. The fourth wedge block 102 is inserted into the third chute 87, and the fourth wedge block 102 passes through the unlocking groove 1013. Under the cooperation of the fourth wedge surface 1014 and the fifth wedge surface 1021, the third wedge block 101 is driven to slide away from the first chute 81. The third wedge block 101 is separated from the leveling block 9. Under the action of the first compression spring 821, the leveling block 9 extends out of the first chute 81.

[0049] In the initial state, the fourth wedge block 102 is inserted and engaged with the unlocking groove 1013. At this time, the leveling block 9 extends out of the first sliding groove 81. When the mounting plate 3 rises, the leveling wheel 8 disengages from the fourth wedge block 102, and the fourth wedge block 102 releases the locking of the third wedge block 101. After that, under the action of the valve stem on the leveling block 9, the leveling block 9 descends. Under the action of the third wedge surface 1011, the third wedge block 101 slides in a direction away from the first sliding groove 81. Subsequently, the leveling block 9 completely enters the first sliding groove 81. Then, the third wedge block 101 is inserted into the locking groove 92 to lock the leveling block 9.

[0050] The implementation principle of a turning device for a slender valve stem according to an embodiment of the present application is as follows: When turning a slender valve stem, one end of the valve stem is first fixed to the three-jaw chuck 11, and the other end is first lapped on the supporting wheel 14. Then, the mounting plate 3 rises, and the leveling wheel 31 and the leveling wheel 8 rise synchronously. Under the action of the valve stem, the leveling block 9 will descend. When the leveling block 9 completely enters the first sliding groove 81, at this time, the valve stem is lapped on the leveling wheel 31 and the leveling wheel 8, and the valve stem is in a horizontal state. Subsequently, the center point 12 moves to abut against the end of the valve stem, the three-jaw chuck 11 drives the valve stem to rotate, and the slide seat 2 drives the tool rest 13 to move, and the tool can perform turning operations on the valve stem. During the process of the tool advancing, the universal support ball 51 will also move synchronously to support the turning point, thereby preventing the valve stem from moving during turning. By the above method, on the one hand, the situation that the valve stem is bent due to gravity is solved, and on the other hand, the movement of the valve stem during turning is reduced, which helps to prevent the valve stem from bending, that is, it helps to improve the processing quality of the valve stem.

[0051] The above are all the preferred embodiments of the present application. The protection scope of the present application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A turning device for a slender valve stem, characterized in that: The machine comprises a machine body (1), wherein a three-jaw chuck (11), a center (12) and a tool holder (13) are arranged on the machine body (1), a slide seat (2) is slidably arranged on the machine body (1), the tool holder (13) is located on the slide seat (2), the tool holder (13) is located on the upper side of the valve stem, a supporting wheel (14) is symmetrically arranged on one side of the machine body (1) located at the center (12), and the two supporting wheels (14) support the valve stem, a mounting plate (3) is arranged on the machine body (1) for lifting, and a leveling wheel (31) is rotatably connected to the mounting plate (3), sliding plates (4) are slidably arranged on both sides of the machine body (1) located on the mounting plate (3), and supporting rods (5) are arranged on the two sliding plates (4) for lifting, and a universal supporting ball (51) is installed on the upper end of the supporting rod (5); The machine body (1) is connected with a first screw rod (15) for rotation in a horizontal direction. The slide seat (2) is threadedly connected to the first screw rod (15). The machine body (1) is provided with a driving motor (16) for driving the first screw rod (15) to rotate. The slide seat (2) is fixedly installed with a linkage rod (21). The linkage rod (21) is vertically arranged. The sliding plate (4) is provided with a linkage groove (41). The linkage rod (21) extends into the linkage groove (41). The linkage groove (41) is opened on one side. The openings of the linkage grooves (41) of the two sliding plates (4) are arranged opposite to each other. A baffle plate (42) is hinged in the linkage groove (41). A rotating tooth (421) is integrally formed on one side of the baffle plate (42). A locking tooth (441) is provided on the shift plate (4) for lifting and lowering. In the initial state, the locking tooth (441) meshes with the rotating tooth (421). The machine body (1) is provided with a plug rod (6), one end of which is formed with a rack portion (61). The sliding plate (4) is provided with a plug groove (45) for plugging with the plug rod (6), and the rotating tooth (421) extends into the plug groove (45); when the sliding plate (4) slides and is plugged with the plug rod (6), the locking tooth (441) rises to release the lock on the rotating tooth (421), and then the rack portion (61) of the plug rod (6) meshes with the rotating tooth (421), and drives the baffle (42) to rotate, and then the linkage rod (21) is disengaged from the linkage groove (41); The sliding plate (4) is provided with a lifting groove (43) in the vertical direction, the lower end of the lifting groove (43) is connected with the plug-in groove (45), the sliding plate (4) is provided with a first wedge block (44) for lifting and sliding in the lifting groove (43), the locking tooth (441) is located below the first wedge block (44), the first wedge block (44) is provided with a penetration groove (442), and the first wedge block (44) is formed with a first locking tooth (441) on the inner wall of the penetration groove (442). A wedge-shaped surface (443), a second wedge block (7) is arranged on the machine body (1), two second wedge blocks (7) are arranged corresponding to the two sliding plates (4), the sliding plate (4) is provided with a sliding groove (46) in the horizontal direction, the sliding groove (46) is connected with the lifting groove (43), the second wedge block (7) is plugged into and slidingly matched with the sliding groove (46), and a second wedge surface (71) is formed on the side of the second wedge block (7) close to the sliding plate (4).

2. A turning device for a slender valve stem according to claim 1, characterized in that: When the sliding plate (4) slides toward the side close to the second wedge block (7), the second wedge block (7) is plugged into the sliding groove (46), and the second wedge block (7) enters the penetration groove (442) of the first wedge block (44). Under the cooperation of the first wedge surface (443) and the second wedge surface (71), the first wedge block (44) rises, and the locking teeth (441) and the rotating teeth (421) are disengaged; the first wedge block (44) is provided with a peripheral side An abutment ring plate (444), the sliding plate (4) is located in the lifting groove (43) and is formed with an abutment groove (431), the abutment ring plate (444) is located in the abutment groove (431), the sliding plate (4) is located in the abutment groove (431) and is provided with a return spring (432), one end of the return spring (432) is connected to the abutment ring plate (444), and the other end of the return spring (432) is connected to the inner wall of the abutment groove (431).

3. The turning device for a slender valve stem according to claim 1, characterized in that: The mounting plate (3) is also rotatably connected to two leveling wheels (8), the highest points of the leveling wheels (8) and the highest points of the leveling wheels (31) are on the same horizontal line, the two leveling wheels (8) are located on both sides of the leveling wheel (31), a first sliding groove (81) is radially provided in the leveling wheel (8), a leveling block (9) is slidably provided in the first sliding groove (81) of the leveling wheel (8), a first annular groove (82) is also provided in the first sliding groove (81) of the leveling wheel (8), a first abutting plate (91) is provided on the circumference of the leveling block (9), the first abutting plate (91) is located in the first annular groove (82), a first compression spring (821) is provided in the first annular groove (82) of the leveling wheel (8), the first compression spring One end of the first compression spring (821) is connected to the inner wall of the first annular groove (82), and the other end of the first compression spring (821) is connected to the first abutment plate (91); a contact switch (811) is installed on the bottom wall of the leveling wheel (8) located in the first sliding groove (81), and an indicator light (83) is installed on the side of the leveling wheel (8), and the indicator light (83) is electrically connected to the contact switch (811). When the leveling block (9) slides and contacts the contact switch (811), the contact switch (811) controls the indicator light (83) to light up; a locking assembly (10) for locking the position of the leveling block (9) is arranged inside the leveling block (9); a counterweight portion (84) is formed on the leveling wheel (8), and under the action of the counterweight portion (84), the leveling block (9) is arranged vertically.

4. A turning device for a slender valve stem according to claim 3, characterized in that: The locking assembly (10) comprises a third wedge block (101), a second slide groove (85) is provided in the horizontal direction in the leveling wheel (8), the third wedge block (101) is slidably arranged in the second slide groove (85), the second slide groove (85) is communicated with the first slide groove (81), a third wedge surface (1011) is formed at the end of the third wedge block (101), a locking groove (92) is provided on the leveling block (9), and the third wedge block (101) is plugged into the locking groove (92) to achieve The leveling block (9) is locked; the leveling wheel (8) is formed with a second annular groove (86) on the peripheral side of the second slide groove (85); the third wedge block (101) is integrally formed with a second abutment plate (1012) on the peripheral side; the leveling wheel (8) is provided with a second compression spring (861) in the second annular groove (86); one end of the second compression spring (861) is connected to the inner wall of the second annular groove (86); and the other end of the second compression spring (861) is connected to the second abutment plate (1012).

5. A turning device for a slender valve stem according to claim 4, characterized in that: A second screw rod (17) is rotatably arranged on the machine body (1) in a vertical direction, and the mounting plate (3) is threadedly connected to the second screw rod (17).

6. A turning device for a slender valve stem according to claim 5, characterized in that: The machine body (1) is fixedly connected with a fixing plate (171), and the fixing plate (171) is located at the lower side of the mounting plate (3). The locking assembly (10) further comprises a fourth wedge block (102), and the fourth wedge block (102) is fixedly mounted on the fixing plate (171) along the vertical direction. A third slide groove (87) is radially provided on the leveling wheel (8), and the third slide groove (87) is connected with the second slide groove (85). An unlocking groove (1013) is provided in the middle of the third wedge block (101), and the third wedge block A fourth wedge surface (1014) is formed on the inner wall of the unlocking groove (1013) of the fourth wedge block (102), and a fifth wedge surface (1021) is formed on the upper end of the fourth wedge block (102); when turning is completed, the mounting plate (3) descends, the fourth wedge block (102) enters the third sliding groove (87), and the fourth wedge block (102) is plugged into the unlocking groove (1013), and under the action of the fourth wedge surface (1014) and the fifth wedge surface (1021), the third wedge block (101) slides to release the lock on the leveling block (9).

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