Turning device for valve rod of stop valve

Abstract

The invention discloses a turning device for a valve rod of a stop valve, and relates to the field of valve rod machining. The turning device comprises a machine body, an annular support is arranged on the machine body in a lifting mode, and a notch is formed in the upper side of the annular support; three centering wheels are arrayed in the annular bracket along the circumference; a first sleeve is arranged at the bottom of the annular support, a first lifting rod is slidably connected into the first sleeve, one pair of middle wheels is rotationally connected to the end of the first lifting rod, a limiting plate is arranged on the peripheral side of the first lifting rod, the first lifting rod is sleeved with a compression spring, and one end of the compression spring is connected with the limiting plate. The other end is connected with the inner wall of the first sleeve; two second sleeves are further arranged in the annular support, second lifting rods are arranged in the second sleeves in a sliding mode, connecting rods are hinged to the ends of the second lifting rods through torsional springs, and the other two centering wheels correspond to the two connecting rods one to one and are hinged to the ends of the corresponding connecting rods. According to the turning device, the turning effect on the valve rod can be guaranteed.

Description

Technical Field

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

[0002] The opening and closing part of the stop valve is a plug-shaped valve disc, which is driven by the valve stem and is suitable for regulating flow.

[0003] The valve stem plays a vital role in the opening and closing process of the stop valve. The processing of the valve stem usually involves casting the raw material, forming a cylindrical rod, and then turning it, and then forming threads and other features.

[0004] During the turning process of the valve stem, one end of the valve stem is clamped and fixed by a three-jaw chuck, and the other end is resisted by a top. Then the three-jaw chuck drives the valve stem to rotate, and the turning tool moves in the length direction of the valve stem to realize the turning operation of the valve stem.

[0005] When one end of the valve stem is fixed to the three-jaw chuck, the end of the valve stem away from the three-jaw chuck undergoes a small droop due to gravity, and it is difficult for the top point to abut against the center of the circle at its end. When the top point does not abut against the center of the circle at the end of the valve stem, the rotation trajectory of the valve stem is also irregular, which seriously affects the turning effect. Summary of the invention

[0006] In order to ensure that the top point abuts against the center of the circle of the valve stem end, thereby ensuring the turning effect, the present application provides a turning device for a stop valve stem.

[0007] The turning device of a stop valve stem provided in the present application adopts the following technical solution: A turning device for a stop valve stem comprises a machine body, a three-jaw chuck rotatably arranged on the machine body, a top slidably arranged on the machine body, and a turning tool holder slidably arranged on the machine body; an annular bracket is lifted and lowered on one side of the machine body close to the top, and a notch is formed on the upper side of the annular bracket for avoiding the valve stem; three centering wheels are arranged in a circumferential array inside the annular bracket, and a clamping gap for clamping the valve stem is formed between the three centering wheels, and the rotation axis of the centering wheels is parallel to the length direction of the valve stem; a first sleeve is arranged at the bottom of the annular bracket, and a first lifting rod is slidably connected inside the first sleeve, wherein one of the centering wheels is rotatably connected to the first lifting rod An end portion, a limit plate is arranged on the circumference of the first lifting rod, the limit plate is located in the first sleeve, a compression spring is sleeved on the first lifting rod, one end of the compression spring is connected to the limit plate, and the other end of the compression spring is connected to the inner wall of the first sleeve; two second sleeves are also arranged in the annular bracket, second lifting rods are slidably arranged in the second sleeves, the ends of the second lifting rods are hinged to connecting rods through torsion springs, and the other two centering wheels correspond to the two connecting rods one by one and the centering wheels are hinged to the corresponding ends of the connecting rods; a synchronous motion component is arranged in the annular bracket, and the synchronous motion component enables the first lifting rod and the two second lifting rods to slide synchronously.

[0008] By adopting the above technical solution, the valve stem is first fixed by a three-jaw chuck, the annular bracket rises, the valve stem enters the annular bracket from the notch, and then the valve stem contacts the two centering wheels first, the valve stem abuts against the two centering wheels on the upper side, the two connecting rods rotate to avoid the valve stem until the valve stem is overlapped on the centering wheels on the lower side, and then under the action of the compression spring, the three centering wheels will clamp the valve stem, and finally the top tip slides and abuts against the end of the valve stem to complete the fixation of the valve stem; the three centering wheels can be used to support the end of the valve stem close to the top tip to prevent the end of the valve stem from sagging, and the three centering wheels move synchronously to ensure that the center line of the valve stem is horizontal, thereby ensuring that the top tip can abut against the center of the circle of the end of the valve stem, thereby ensuring the subsequent turning effect.

[0009] Preferably, the synchronous motion component includes a linkage rack, a first connecting rod, a linkage gear and a second connecting rod, an annular groove is provided in the annular bracket, two linkage racks are provided, which correspond to the two second lifting rods one by one, the linkage rack is in an arc shape, the annular bracket is located in the annular groove and also has a T-shaped groove, a T-shaped block is provided on the linkage rack, and the T-shaped block slides with the T-shaped groove, the first connecting rod is provided with two, the two first connecting rods correspond to the two linkage racks one by one, one end of the first connecting rod is hinged to the end of the first lifting rod, and the other end of the first connecting rod is hinged to the corresponding linkage rack, the linkage gear is provided with two, the two linkage gears correspond to the two second lifting rods one by one, the linkage gear is rotatably connected in the second sleeve, and the linkage gear is meshed with the corresponding linkage rack, the second connecting rod is provided with two, which correspond to the two linkage gears one by one, one end of the second connecting rod is hinged to the linkage gear and the hinge point is eccentric to the center of the linkage gear, and the other end of the second connecting rod is hinged to the corresponding second lifting rod.

[0010] By adopting the above technical scheme, when the valve stem abuts against the two upper centering wheels, the two connecting rods rotate to avoid the valve stem. When it abuts against the lower centering wheel, the centering wheel is pressed down, and the first lifting rod drives the linkage rack to slide through the first connecting rod. The sliding of the linkage rack will drive the linkage gear to rotate. The linkage gear drives the second lifting rod to slide through the second connecting rod, and drives the other two pairs of center wheels to move, that is, the synchronous movement of the three pairs of center wheels is realized. When the valve stem enters the clamping gap, under the action of the compression spring, the three centering wheels are tightened synchronously to clamp the valve stem in a centering manner. When the valve stem is processed, the annular bracket descends. At this time, the valve stem will drive the two pairs of center wheels on the upper side to slide, thereby avoiding the detachment of the valve stem. When the valve stem is detached, the centering wheel is reset.

[0011] Preferably, a lifting plate is provided on the machine body for lifting, the annular bracket is fixedly connected to the lifting plate, a driving cylinder is provided on the machine body along the vertical direction, and the lifting plate is fixedly connected to the end of the lifting plate.

[0012] By adopting the above technical scheme, one end of the valve stem is fixed to the three-jaw chuck, and then the driving cylinder drives the piston rod to extend, and the stroke of the driving cylinder is set in advance, that is, the lifting plate drives the rising stroke of the annular bracket to be fixed, and the center of the annular bracket and the clamping center of the three-jaw chuck are on the same horizontal line. When the annular bracket rises, the valve stem contacts the two centering wheels on the upper side, and the two connecting rods rotate, and then the centering wheel on the lower side is pressed down by the valve stem, and then the three centering wheels move synchronously to achieve the centering clamping and fixing of the valve stem; when the valve stem is processed, the driving cylinder drives the annular bracket to descend, the two centering wheels on the upper side are squeezed with the valve stem, and the second lifting rod retracts to avoid the valve stem, so that the valve stem and the annular bracket are separated; the annular bracket is driven to rise and fall by the driving cylinder to achieve automatic centering clamping of the valve stem.

[0013] Preferably, an exposure opening is provided on the outer edge of the annular bracket, the exposure opening is connected to the T-slot, a plurality of first ratchets are provided on the T-block, a locking block is provided on the body, and a second ratchets are provided on the locking block; when the annular bracket clamps the valve stem to the center, the first ratchets and the second ratchets are meshed, and at this time the linkage rack can only slide in the direction of the first lifting rod.

[0014] By adopting the above technical scheme, after the annular bracket clamps and centers the valve stem, the first ratchet and the second ratchet engage, and at this time the linkage rack can only slide in the direction of the first lifting rod, that is, the three centering wheels can only move toward each other, because during the turning process, the turning tool can pass through the notch of the annular bracket to turn the valve stem. After turning, the diameter of the valve stem becomes smaller. At this time, under the action of the compression spring, the three centering wheels can always maintain the centering clamping of the valve stem to ensure the stability of the valve stem during the turning process; the centering wheel relies on the action of the compression spring to press against the valve stem. If the valve stem moves radially during the turning process, the centering wheel will cause movement and slippage, and the stability of the valve stem during the turning process cannot be guaranteed. The cooperation of the first ratchet and the second ratchet can prevent the linkage rack from slipping to increase the clamping gap, which helps to ensure the clamping effect of the three centering wheels on the valve stem and improve the turning effect.

[0015] Preferably, a mounting block is provided on the machine body, a sliding groove is provided in the mounting block, the locking block slides in the sliding groove, the mounting block is provided with an abutment spring in the sliding groove, the length direction of the abutment spring is consistent with the sliding direction of the locking block, one end of the abutment spring is connected to the inner wall of the sliding groove, and the other end of the abutment spring is connected to the locking block.

[0016] By adopting the above technical solution, when the linked rack slides to reduce the clamping gap, the first ratchet slides relative to the second ratchet, and the locking block drives the second ratchet to slide away from the first ratchet to avoid the movement of the first ratchet. When the second ratchet disengages from the first ratchet, under the action of the abutment spring, the locking block drives the second ratchet to slide toward the first ratchet and locks with the first ratchet again.

[0017] Preferably, the locking block is rotatably connected to a rotating column via a torsion spring, the second ratchet is provided with one, the second ratchet is fixedly connected to the rotating column, and a locking piece for locking the rotating action of the rotating column is provided on the lifting plate.

[0018] By adopting the above technical scheme, in practice, when the driving cylinder drives the annular bracket to rise, there are two strokes. The first stroke is that the annular bracket rises and the center of the circle will be higher than the clamping center of the three-jaw chuck. In the second stroke, the driving cylinder drives the annular bracket to descend, so that the center of the circle of the annular bracket is in line with the clamping center of the three-jaw chuck. The reasons for the first stroke of the driving cylinder are as follows: if the annular bracket rises directly until the center of the circle is in line with the clamping center of the three-jaw chuck, because the valve stem will first abut against the two centering wheels on the upper side, and then the connecting rod will rotate, and in this stroke, the centering wheel on the upper side will always abut against the valve stem, then there will be a situation where all three centering wheels abut against the valve stem, but the connecting rod is not reset under the action of the torsion spring, and the valve stem is not horizontal at this time; therefore, in the first stroke, the annular bracket rises a large distance, which can ensure that the two centering wheels on the upper side are in line with the valve stem. When the rod is disengaged, the connecting rod can be reset to ensure that the second process is then carried out. At this time, the three centering wheels can move synchronously to achieve the centering clamping of the valve stem; and the cooperation of the first ratchet and the second ratchet causes a conflict with the second ratchet when the annular bracket is upward. In the present application, the rotating column drives the second ratchet to rotate on the locking block. Therefore, when the annular bracket rises, the second ratchet can rotate upward to avoid the first ratchet. Then, in the second stroke of the driving cylinder, the annular bracket descends, and under the action of the torsion spring, the second ratchet is reset. At this time, the first ratchet on the linkage rack can move relative to the second ratchet, and the locking block slides away from the linkage rack to avoid it. After clamping and centering, the locking piece locks the rotating column to prevent the linkage rack from sliding upward due to the radial movement of the valve stem during the turning process.

[0019] Preferably, the locking piece is configured as a locking pin, which is arranged on the lifting plate in the vertical direction, and the locking pin is slidably connected to the lifting plate, and a locking groove is penetrated by the rotating column. In the initial state, the locking groove is vertically arranged; a fixing block is fixedly arranged on the machine body, a lifting groove is arranged in the fixing block, and the mounting block slides and cooperates with the lifting groove, and a return spring is provided in the lifting groove of the fixing block, and the return spring is located on the upper side of the mounting block, one end of the return spring is connected to the mounting block, and the other end of the return spring is connected to the inner wall of the lifting groove; when the annular bracket rises, the first ratchet drives the second ratchet to rotate, and the locking pin abuts against the rotating column. After the annular bracket continues to rise, the locking pin drives the mounting block to rise in the lifting groove through the rotating column.

[0020] By adopting the above technical solution, when the driving cylinder drives the annular bracket to rise and in the process of the first stroke, the first ratchet will drive the second ratchet to rotate upward, that is, the rotating column rotates, the annular bracket continues to rise, the locking pin abuts against the rotating column and drives the mounting block to move upward synchronously. At this time, the second ratchet is in an upwardly rotating state and abuts against the first ratchet; then the driving cylinder drives the annular bracket to descend for the second stroke, the linkage rack will slide in the direction of the first lifting rod, the first ratchet will move relative to the second ratchet, and under the action of the torsion spring, the second ratchet is reset, that is, the rotating column is reset. The locking pin is plugged into the locking slot, and the locking pin locks the rotating column at this time. Then, when the first ratchet moves, the second ratchet follows the first ratchet under the action of the reset spring, and the mounting block may not be reset in the end. After that, when the radius of the valve stem becomes smaller, the first ratchet moves, and the second ratchet continues to follow the first ratchet, that is, the mounting block will gradually reset. Even if the mounting block is not reset, the second ratchet always exerts downward pressure on the first ratchet under the action of the reset spring, so that the clamping effect of the three centering wheels on the valve stem is more stable.

[0021] Preferably, a slide seat is slidably provided in the body, the tool holder is mounted on the slide seat, the slide seat is located on the upper side of the annular bracket, a liquid spray pipe is also provided on the slide seat, and the water outlet of the liquid spray pipe faces the tool.

[0022] By adopting the above technical solution, after the valve stem is fixed, the slide drives the tool holder to move, and the tool slides along the length direction of the valve stem to realize the turning operation of the valve stem. During the turning process, the spray pipe sprays coolant onto the tool to cool the tool.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: 1. The center of the annular bracket is in line with the clamping center of the three-jaw chuck. The three centering wheels on the annular bracket clamp and fix the end of the valve stem close to the top to prevent the end of the valve stem from sagging, thereby ensuring that the top and the end center of the valve stem are in contact, ensuring the turning effect of the valve stem; 2. The first ratchet and the second ratchet are used to make the linkage rack slide only in one direction. During the turning process, the valve stem diameter gradually decreases, and the compression spring acts so that the three centering wheels can always abut against the valve stem to maintain the clamping centering effect. The linkage rack cannot slide away from the first lifting rod, which can prevent the radial movement of the valve stem from causing the centering wheel to fluctuate and affect the turning effect. 3. When the annular bracket rises and makes the center of the circle higher than the clamping center of the three-jaw chuck, it can ensure that the two pairs of middle wheels on the upper side are disengaged from the valve stem and reset, and then the annular bracket descends until the center of the circle is in line with the clamping center of the three-jaw chuck. At this time, the three pairs of middle wheels clamp the valve stem and fix it. When the annular bracket rises, the first ratchet drives the second ratchet to rotate, and the locking pin drives the mounting block to rise through the rotating column, the first ratchet and the second ratchet engage, and then the annular bracket descends to clamp the valve stem and center it. The second ratchet is reset under the action of the torsion spring, and the rotating column is reset, the locking pin is plugged into the locking groove, and then under the action of the reset spring, the second ratchet follows the first ratchet to move down, and the locking pin locks the rotation of the rotating column to ensure that the second ratchet restricts the unidirectional movement of the first ratchet. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 It is a partial structural schematic diagram of an embodiment of the present application; Figure 3 This is a cross-sectional view of the annular bracket in the embodiment of the present application, which mainly reflects the structure of the synchronous motion component; Figure 4 This is a partial structural diagram of the annular bracket in the embodiment of the present application, mainly showing the structure of the T-slot; Figure 5 This is a partial structural diagram of an embodiment of the present application, which mainly reflects the structure of a fixing block, a mounting block and a locking block; Figure 6 This is a partial structural diagram of an embodiment of the present application, which mainly reflects the structure of the follower spring; Figure 7 This is a state change diagram of the annular bracket in the present application when performing the first stroke movement.

[0025] Figure numerals: 1, machine body; 12, three-jaw chuck; 13, center; 14, tool rest; 15, slide; 16, spray pipe; 17, driving cylinder; 2, lifting plate; 21, sliding groove; 22, follower spring; 3, annular bracket; 31, notch; 32, annular groove; 33, T-slot; 4, centering wheel; 41, clamping gap; 5, first sleeve; 51, first lifting rod; 511, limit plate; 52, compression spring; 6, second sleeve; 6 1. Second lifting rod; 62. Connecting rod; 7. Synchronous motion assembly; 71. Linked rack; 711. T-block; 712. First ratchet; 72. First connecting rod; 73. Linked gear; 74. Second connecting rod; 8. Locking block; 81. Second ratchet; 82. Rotating column; 821. Locking groove; 9. Mounting block; 91. Sliding groove; 92. Abutment spring; 10. Locking pin; 20. Fixed block; 201. Lifting groove; 202. Reset spring. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1 -Attached Figure 7 This application is described in further detail.

[0027] The embodiment of the present application discloses a turning device for a stop valve stem.

[0028] Reference Figure 1 and Figure 2 The turning device of the stop valve stem includes a body 1, a three-jaw chuck 12 rotatably arranged on the body 1, a top 13 slidably arranged on the body 1, and a turning tool holder 14 slidably arranged on the body 1. The above are all conventional settings of the lathe and will not be described in detail here. A slide seat 15 is slidably connected to the body 1. The slide seat 15 is located on the upper side of the annular bracket 3. The slide seat 15 is driven by a motor screw. The turning tool holder 14 is installed on the slide seat 15. A spray pipe 16 is also installed on the slide seat 15. The water outlet of the spray pipe 16 faces the turning tool to cool the turning tool; a lifting plate 2 is lifted and lowered on one side of the body 1 close to the top 13, and a ring bracket 3 is fixedly connected to the lifting plate 2. A notch 31 is opened on the upper side of the ring bracket 3 to avoid the installation of the valve stem and the movement of the turning tool. There are three centering wheels 4 arranged in a circumferential array inside the annular bracket 3, and a clamping gap 41 for clamping the valve stem is formed between the three centering wheels 4, and the rotation axes of all the centering wheels 4 are parallel to the length direction of the valve stem. A first sleeve 5 is installed at the bottom of the annular bracket 3, and the first sleeve 5 is vertically arranged. A first lifting rod 51 is slidably connected inside the first sleeve 5, and one of the centering wheels 4 is rotatably connected to the end of the first lifting rod 51. Two second sleeves 6 are also symmetrically installed on the inner side of the annular bracket 3, and the two second sleeves 6 and the first sleeve 5 are distributed on the annular bracket 3 in a circumferential array. The second sleeves 6 are all slidably connected to the second lifting rod 61, and the end of the second lifting rod 61 is hinged with a connecting rod 62 through a torsion spring. The other two centering wheels 4 correspond to the two connecting rods 62 one by one, and the centering wheels 4 are hinged to the corresponding ends of the connecting rods 62.

[0029] Reference Figure 2 and Figure 3 A limiting plate 511 is integrally formed on the circumference of the first lifting rod 51, and the limiting plate 511 is located in the first sleeve 5. A compression spring 52 is sleeved on the first lifting rod 51, and the compression spring 52 is located on the lower side of the limiting plate 511. One end of the compression spring 52 is connected to the limiting plate 511, and the other end is connected to the inner wall of the first sleeve 5. A synchronous motion component 7 is arranged in the annular bracket 3, and the synchronous motion component 7 enables the first lifting rod 51 and the two second lifting rods 61 to slide synchronously.

[0030] When fixing the valve stem, first fix one end of the valve stem to the three-jaw chuck 12, and then the annular bracket 3 rises, and the valve stem first abuts against the two pairs of centering wheels 4 on the upper side, and then the connecting rod 62 rotates to avoid the valve stem from entering the clamping gap 41. The annular bracket 3 has two strokes when centering and clamping the valve stem. The first stroke is the rise of the annular bracket 3, and the clamping center of the annular bracket 3, that is, the center of the circle, will be higher than the clamping center of the three-jaw chuck 12, mainly to ensure that the two pairs of centering wheels 4 on the upper side can be disengaged from the valve stem, and then reset under the action of the torsion spring; the second stroke is the descent of the annular bracket 3, and the clamping center of the annular bracket 3, that is, the center of the circle, is colinear with the clamping center of the three-jaw chuck 12. During this process, under the action of the compression spring 52, the centering wheel 4 on the lower side rises, and the two centering wheels 4 on the upper side are driven to extend through the synchronous motion component 7 to achieve clamping and centering of the valve stem. That is, the annular support 3 can ensure that the end of the valve stem is level, thereby ensuring that the tip 13 can abut against the center of the circle of the end of the valve stem, which helps to ensure the subsequent turning effect.

[0031] If the annular bracket 3 directly rises to the point where the clamping center is in line with the clamping center of the three-jaw chuck 12, the valve stem will first abut against the two centering wheels 4 on the upper side, and then the connecting rod 62 will rotate. During this stroke, the centering wheel 4 on the upper side will always abut against the valve stem. In this case, there will be a situation where all three centering wheels 4 abut against the valve stem, but the connecting rod 62 is not reset under the action of the torsion spring. At this time, the valve stem is not horizontal, so the annular bracket 3 performs the first stroke and disengages from the two pairs of centering wheels 4 on the upper side to ensure that the connecting rod 62 is reset, and then the three pairs of centering wheels 4 synchronously clamp and center the valve stem.

[0032] Reference Figure 1 A driving cylinder 17 is fixedly installed on the machine body 1 in the vertical direction, and the lifting rod is fixedly connected to the end of the piston rod of the driving cylinder 17. The driving cylinder 17 is controlled by programming.

[0033] Reference Figure 2 , Figure 3 and Figure 4The synchronous motion component 7 includes a linkage rack 71, a first connecting rod 72, a linkage gear 73 and a second connecting rod 74. A ring groove 32 is provided in the annular bracket 3. Two linkage racks 71 are provided, which correspond to the two second lifting rods 61 one by one. The linkage rack 71 is in an arc shape, which is adapted to the shape of the ring groove 32. The annular bracket 3 is provided with a T-shaped groove 33 in the ring groove 32. A T-shaped block 711 is integrally formed on the linkage rack 71. The T-shaped block 711 and the T-shaped groove 33 are slidably matched; there are two first connecting rods 72, and the two first connecting rods 72 correspond to the two linkage racks 71 one by one. The first connecting rod 72 is provided with two linkage racks 71. One end of 72 is hinged to the first lifting rod 51, and the other end is hinged to the corresponding linkage rack 71. Two linkage gears 73 are provided, and the two linkage gears 73 correspond to the two second lifting rods 61 one by one. The linkage gear 73 is rotatably connected in the second sleeve 6, and the linkage gear 73 is meshed with the corresponding linkage rack 71. Two second connecting rods 74 are provided, and the two second connecting rods 74 correspond to the two linkage gears 73 one by one. One end of the second connecting rod 74 is hinged to the linkage gear 73, and the hinge point is eccentric to the center of the linkage gear 73. The other end of the second connecting rod 74 is hinged to the corresponding second lifting rod 61.

[0034] When the valve stem abuts against the centering wheel 4 on the lower side, if the lower centering wheel 4 descends, the first lifting rod 51 drives the linkage rack 71 to slide in the direction of the linkage gear 73 through the first connecting rod 72, and the linkage gear 73 rotates, and drives the corresponding second lifting rod 61 to move through the second connecting rod 74, and the two pairs of centering wheels 4 on the upper side move synchronously toward the direction of the annular bracket 3. At this time, the clamping gap 41 becomes larger. When the compression spring 52 drives the centering wheel 4 to rise, the other two pairs of centering wheels 4 move synchronously to realize the centering clamping of the valve stem. The synchronous movement of the three pairs of centering wheels 4 can ensure that the clamping center is unique, thereby ensuring the levelness of the valve stem.

[0035] An exposure opening is provided on the outer edge of the annular bracket 3, and the exposure opening is connected to the T-slot 33 for exposing the T-block 711. A plurality of first ratchet teeth 712 are integrally formed on the T-block 711. A locking block 8 is provided on the body 1, and a second ratchet tooth 81 is provided on the locking block 8. When the annular bracket 3 clamps the valve stem and is centered, the first ratchet teeth 712 and the second ratchet teeth 81 are meshed.

[0036] A mounting block 9 is provided on the machine body 1, a sliding groove 91 is opened in the mounting block 9, and the locking block 8 slides in the sliding groove 91. The mounting block 9 is located in the sliding groove 91 and is provided with an abutment spring 92. The length direction of the abutment spring 92 is consistent with the sliding direction of the locking block 8. One end of the abutment spring 92 is connected to the locking block 8, and the other end is connected to the inner wall of the sliding groove 91.

[0037] After the annular bracket 3 clamps and centers the valve stem, the first ratchet tooth 712 and the second ratchet tooth 81 engage, and at this time the linkage rack 71 can only slide in the direction of the first lifting rod 51, that is, it can only reduce the clamping gap 41, and cannot increase the clamping gap 41; during the turning process, the diameter of the valve stem will become smaller, and under the action of the compression spring 52, the centering wheel 4 will always be pressed against the valve stem, and the linkage rack 71 will slip, the first ratchet tooth 712 will slip relative to the second ratchet tooth 81, and the locking block 8 will slip to avoid the movement of the first ratchet tooth 712, that is, the three centering wheels 4 can always ensure the centering clamping of the valve stem; during the turning process, the valve stem has radial movement, which will cause the centering wheel 4 to slip back and forth and produce fluctuations, affecting the turning effect, and in the present application, with the cooperation of the first ratchet tooth 712 and the second ratchet tooth 81, the clamping gap 41 can only be reduced, so the centering wheel 4 will always be pressed against the valve stem, and will not fluctuate, thereby helping to improve the turning effect.

[0038] Reference Figure 2 and Figure 5 , a rotating column 82 is hinged on the locking block 8 through a torsion spring, the second ratchet 81 is fixedly connected to the rotating column 82, and a locking piece is provided on the lifting plate 2 to lock the rotating action of the rotating column 82. After the three centering wheels 4 on the annular bracket 3 clamp and center the valve stem, the first ratchet 712 meshes with the second ratchet 81, and the second ratchet 81 restricts the first ratchet 712 from moving upward. In the first stroke of the annular bracket 3, the annular bracket 3 will rise and the clamping center is higher than the clamping center of the three-jaw chuck 12, so the first ratchet 712 will move upward relative to the second ratchet 81. At this time, the first ratchet 712 will drive the second ratchet 81 to rotate, thereby ensuring the smooth rise of the annular bracket 3; when the annular bracket 3 moves in the second stroke, that is, it descends, under the action of the torsion spring, the second ratchet 81 rotates and resets, and remains in meshing with the first ratchet 712; then the locking piece locks the rotating column 82 to prevent the second ratchet 81 from rotating.

[0039] Reference Figure 5 and Figure 6The locking member is set as a locking pin 10, which is installed on the lifting plate 2 in the vertical direction. The lifting plate 2 is provided with a sliding groove 21. The lower end of the locking pin 10 is slidably matched with the sliding groove 21, and the lifting plate 2 is provided with a follower spring 22 in the sliding groove 21. One end of the follower spring 22 is connected to the locking pin 10, and the other end is connected to the inner wall of the sliding groove 21; a locking groove 821 is penetrated and opened on the rotating column 82, and in the initial state, the locking groove 821 is vertically arranged; a fixed block 20 is fixedly installed on the machine body 1, and a lifting groove 20 is provided in the fixed block 20 1. The mounting block 9 is slidably matched with the lifting groove 201. The fixed block 20 is located in the lifting groove 201 and is provided with a return spring 202. The return spring 202 has a large elastic coefficient. The return spring 202 is located on the upper side of the mounting block 9. The length direction of the return spring 202 is consistent with the sliding direction of the mounting block 9. One end of the return spring 202 is connected to the mounting block 9, and the other end is connected to the inner wall of the lifting groove 201; and the fixed block 20 is also provided with a guide groove in the vertical direction in the lifting groove to cooperate with the guide sliding of the mounting block 9, so as to ensure that the mounting block 9 is lifted and lowered in the vertical direction.

[0040] Reference Figure 7 When the annular bracket 3 drives the annular bracket 3 to rise and move in the first stroke, the first ratchet tooth 712 will drive the second ratchet tooth 81 to rotate upward, and when the clamping center of the annular bracket 3 is lower than the clamping center of the three-jaw chuck 12, the first ratchet tooth 712 will drive the second ratchet tooth 81 to rotate upward, that is, the rotating column 82 rotates. When the clamping center of the annular bracket 3 rises to be collinear with the clamping center of the three-jaw chuck 12, the locking pin 10 abuts against the rotating column 82. At this time, the locking pin 10 is not plugged into the locking groove 821, and then the annular bracket 3 rises and the clamping center is higher than the clamping center of the three-jaw chuck 12. The locking pin 10 abuts against the rotating column 82 and makes the mounting block 9 rise in the lifting groove 201. At this time, the second ratchet tooth 81 is always in contact with the first ratchet tooth 712, and the second ratchet tooth 81 is in an upwardly rotated state; then the annular bracket 3 descends for the second stroke, and the rack is linked at the same time. When the locking cam 721 is in the closed position, the locking cam 722 is in the closed position, and the locking cam 723 is in the closed position, and the locking cam 724 ...

[0041] The implementation principle of a turning device for a stop valve stem of an embodiment of the present application is as follows: when turning the valve stem, one end of the valve stem is first fixed to the three-jaw chuck 12, and then the annular bracket 3 rises, and the valve stem enters the annular bracket 3 from the notch 31 of the annular bracket 3, and the valve stem first abuts against the two pairs of center wheels 4 on the upper side, and the two connecting rods 62 rotate to avoid the entry of the valve stem, and when the annular bracket 3 rises, the two pairs of center wheels 4 on the upper side will be separated from the valve stem to ensure the reset of the connecting rod 62, and then the annular bracket 3 is lowered, so that the clamping center of the annular bracket 3 is in line with the clamping center of the three-jaw chuck 12. In this process, the three centering wheels 4 clamp and fix the valve stem, so that the end of the valve stem can be kept in a horizontal state to prevent it from sagging, and then the top 13 abuts against the end of the valve stem, and then the three-jaw chuck 12 drives the valve stem to rotate, and the turning tool performs a turning operation on the valve stem; in this way, the valve stem can be kept in a horizontal state to prevent the sagging of the valve stem from affecting the turning effect.

[0042] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A turning device for a stop valve stem, comprising a body (1), a three-jaw chuck (12) rotatably arranged on the body (1), a tip (13) slidably arranged on the body (1), and a turning tool holder (14) slidably arranged on the body (1); characterized in that: The body (1) is provided with an annular bracket (3) on one side close to the top (13), and a notch (31) for avoiding the valve stem is formed on the upper side of the annular bracket (3); three centering wheels (4) are arranged in a circumferential array inside the annular bracket (3), and a clamping gap (41) for clamping the valve stem is formed between the three centering wheels (4), and the rotation axis of the centering wheels (4) is parallel to the length direction of the valve stem; a first sleeve (5) is provided at the bottom of the annular bracket (3), and a first lifting rod (51) is slidably connected inside the first sleeve (5), wherein one of the centering wheels (4) is rotatably connected to the end of the first lifting rod (51), and a limiting plate (511) is provided on the circumferential side of the first lifting rod (51), and the limiting plate (511) is located inside the first sleeve (5). The first lifting rod (51) is sleeved with a compression spring (52), one end of the compression spring (52) is connected to the limit plate (511), and the other end of the compression spring (52) is connected to the inner wall of the first sleeve (5); the annular bracket (3) is further provided with two second sleeves (6), each of which is provided with a second lifting rod (61) that slides inside the second sleeves (6), and the ends of the second lifting rods (61) are hinged to connecting rods (62) through torsion springs, and the other two centering wheels (4) correspond to the two connecting rods (62) one by one, and the centering wheels (4) are hinged to the corresponding ends of the connecting rods (62); the annular bracket (3) is provided with a synchronous motion component (7), and the synchronous motion component (7) enables the first lifting rod (51) and the two second lifting rods (61) to slide synchronously.

2. A turning device for a stop valve stem according to claim 1, characterized in that: The synchronous motion component (7) comprises a linkage rack (71), a first connecting rod (72), a linkage gear (73) and a second connecting rod (74); an annular groove (32) is provided in the annular bracket (3); two linkage racks (71) are provided, corresponding one to one with the two second lifting rods (61); the linkage rack (71) is in an arc shape; the annular bracket (3) is also provided with a T-shaped groove (33) in the annular groove (32); a T-shaped block (711) is provided on the linkage rack (71); the T-shaped block (711) is slidably matched with the T-shaped groove (33); two first connecting rods (72) are provided, the two first connecting rods (72) correspond one to one with the two linkage racks (71); the first connecting rod (72) ) is hinged to the end of the first lifting rod (51), the other end of the first connecting rod (72) is hinged to the corresponding linkage rack (71), two linkage gears (73) are provided, and the two linkage gears (73) correspond to the two second lifting rods (61) one by one, the linkage gear (73) is rotatably connected in the second sleeve (6), and the linkage gear (73) is meshed with the corresponding linkage rack (71), the second connecting rod (74) is provided with two linkage gears (73) corresponding to the two linkage gears (73), one end of the second connecting rod (74) is hinged to the linkage gear (73) and the hinge point is eccentric to the center of the linkage gear (73), and the other end of the second connecting rod (74) is hinged to the corresponding second lifting rod (61).

3. A turning device for a stop valve stem according to claim 2, characterized in that: A lifting plate (2) is provided on the machine body (1) for lifting, the annular bracket (3) is fixedly connected to the lifting plate (2), a driving cylinder (17) is provided on the machine body (1) in a vertical direction, and the lifting plate (2) is fixedly connected to the end of the lifting plate (2).

4. A turning device for a stop valve stem according to claim 3, characterized in that: An exposed opening is provided on the outer edge of the annular bracket (3), the exposed opening is communicated with the T-shaped slot (33), a plurality of first ratchet teeth (712) are provided on the T-shaped block (711), a locking block (8) is provided on the body (1), and a second ratchet tooth (81) is provided on the locking block (8); when the annular bracket (3) clamps and centers the valve stem, the first ratchet teeth (712) and the second ratchet teeth (81) are meshed, and at this time the linkage rack (71) can only slide in the direction of the first lifting rod (51).

5. A turning device for a stop valve stem according to claim 4, characterized in that: The machine body (1) is provided with a mounting block (9), a sliding groove (91) is provided in the mounting block (9), the locking block (8) slides in the sliding groove (91), the mounting block (9) is provided with an abutment spring (92) in the sliding groove (91), the length direction of the abutment spring (92) is consistent with the sliding direction of the locking block (8), one end of the abutment spring (92) is connected to the inner wall of the sliding groove (91), and the other end of the abutment spring (92) is connected to the locking block (8).

6. A turning device for a stop valve stem according to claim 5, characterized in that: The locking block (8) is rotatably connected to a rotating column (82) via a torsion spring, the second ratchet (81) is provided with one, the second ratchet (81) is fixedly connected to the rotating column (82), and the lifting plate (2) is provided with a locking piece for locking the rotating action of the rotating column (82).

7. A turning device for a stop valve stem according to claim 6, characterized in that: The locking member is configured as a locking pin (10), the locking pin (10) is arranged on the lifting plate (2) along the vertical direction, and the locking pin (10) is slidably connected to the lifting plate (2), and a locking groove (821) is provided through the rotating column (82), and in an initial state, the locking groove (821) is vertically arranged; a fixing block (20) is fixedly arranged on the machine body (1), and a lifting groove (201) is provided in the fixing block (20), and the mounting block (9) is slidably matched with the lifting groove (201), and the fixing block (20) is located in the lifting groove (201). A return spring (202) is provided inside, and the return spring (202) is located on the upper side of the mounting block (9), one end of the return spring (202) is connected to the mounting block (9), and the other end of the return spring (202) is connected to the inner wall of the lifting groove (201); when the annular bracket (3) rises, the first ratchet (712) drives the second ratchet (81) to rotate, and the locking pin (10) abuts against the rotating column (82). After the annular bracket (3) continues to rise, the locking pin (10) drives the mounting block (9) to rise in the lifting groove (201) through the rotating column (82).

8. The turning device for a stop valve stem according to claim 1, characterized in that: A slide seat (15) is slidably arranged in the machine body (1), the turning tool holder (14) is mounted on the slide seat (15), the slide seat (15) is located on the upper side of the annular bracket (3), and a liquid spray pipe (16) is also arranged on the slide seat (15), the water outlet of the liquid spray pipe (16) faces the turning tool.

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