Nut internal cooling and lubricating chip removal tapping device

Abstract

The present application relates to nut processing technical field, especially a kind of nut inner cooling and lubrication chip removal tapping device, including machine body, clamping mechanism, tapping mechanism and push mechanism;The present application can solve the following problems existing in the existing horizontal tapping machine: it is difficult to effectively enter the cutting area of tap and nut inner hole by using external spray type cooling, residual chips cannot be flushed in time, affect cutting accuracy;When different outer diameter or thickness of nut needs to be switched, the whole set of fixture and debugging must be replaced, resulting in long change type time, low production efficiency;The present application injects cooling liquid to the cutting area of tap and nut inner hole, to provide cooling, lubrication and chip removal for the dead angle part that external cooling liquid cannot flush, effectively prevent chip residue from affecting cutting accuracy;The present application can adaptively adjust chuck and vertical clamping strip according to the outer diameter and thickness of nut, so as to tap different specifications of nut, greatly improve production efficiency.

Description

Technical Field

[0001] This invention relates to the field of nut processing technology, and in particular to a nut internal cooling and lubrication chip removal tapping device. Background Technology

[0002] In the internal thread machining of nuts, horizontal multi-axis automatic tapping machines are usually used. These tapping machines can realize multi-station synchronous tapping, automatic feeding and unloading, and are the core processing equipment in the mass production of nuts. During the tapping process, the cooling, lubrication and chip removal effects of the tap and nut directly determine the service life of the tap, the machining accuracy of the nut's internal thread and the surface finish.

[0003] Existing horizontal multi-axis nut tapping machines generally adopt an external spray cooling and lubrication scheme, which means that by arranging spray pipes outside the tapping station, coolant is sprayed directly onto the outer surface of the tap and nut. The flow of coolant covers and cools the cutting area, and the coolant washes away the chips generated during processing.

[0004] However, existing horizontal multi-axis nut tapping machines still have some shortcomings in actual use: 1. Existing technologies typically employ external spray cooling, which makes it difficult for the coolant to effectively enter the cutting area of ​​the tap and nut inner hole. This results in the cutting heat not being dissipated in time. At the same time, chips tend to remain in the thread grooves. The external spray's chip-removing force is insufficient to remove the residual chips in time, which can easily damage the machined thread surface and affect cutting accuracy.

[0005] 2. The clamping mechanism of existing horizontal nut tapping machines is usually designed for nuts of specific specifications. The size of the positioning groove or jaws used to store the nut is fixed. When it is necessary to switch to nuts with different outer diameters or thicknesses, the machine must be stopped to replace the entire set of clamps and make adjustments, resulting in long changeover time and low production efficiency.

[0006] Therefore, based on the above-mentioned viewpoints, there is still room for improvement in existing nut tapping methods. Summary of the Invention

[0007] To address the aforementioned problems, this invention provides a nut internal cooling and lubrication chip removal tapping device, comprising a machine body, a clamping mechanism, a tapping mechanism, and a pushing mechanism mounted on the machine body; a spindle box is provided at the upper end of the machine body, the tapping mechanism is mounted on the side wall of the spindle box, a support frame is provided on the side wall of the spindle box, and a clamping mechanism that works in conjunction with the tapping mechanism is mounted at the lower end of the support frame; the clamping mechanism is used to support nuts to be tapped stacked from top to bottom, and the clamping mechanism can adaptively adjust according to nuts of different thicknesses and outer diameters; the tapping mechanism is used to tap the nuts clamped in the clamping mechanism; the pushing mechanism is used to push nuts that fall from the clamping mechanism toward the tap side, so that the nuts fit onto the outer wall of the tap for tapping; The tapping mechanism includes several rotating shafts rotatably mounted on the side wall of the spindle box. The ends of the rotating shafts are provided with taps for tapping. The taps are equipped with auxiliary units for internal cooling, lubrication, and chip removal to ensure tapping accuracy.

[0008] Preferably, the auxiliary unit includes two symmetrically formed strip grooves on the surface of the tap, an empty groove is formed inside the tap, and multiple drainage holes are formed at equal intervals between the strip grooves and the empty groove. A chip shield is provided on the side of the drainage hole away from the empty groove.

[0009] Preferably, an annular groove is formed on the outer wall of the tap near the rotating shaft, and multiple through holes communicating with the empty groove are uniformly formed on the inner wall of the annular groove. An annular cylinder is rotatably fitted on the outer wall of the annular groove, and an annular notch communicating with the multiple through holes is formed on the inner wall of the annular cylinder. A connecting pipe is provided on the outer wall of the annular cylinder for connecting an external pump body to inject coolant into the annular cylinder.

[0010] Preferably, a telescopic cylinder is provided at one end of the rotating shaft near the tap, the output end of the telescopic cylinder is connected to the tap through a linkage shaft, and a limit stop is provided between the output end of the telescopic cylinder and the cylinder barrel.

[0011] Preferably, the machine body is equipped with a support platform located below the clamping mechanism. The support platform has multiple connecting holes corresponding to the tap positions. Two lifting platforms are installed on the bottom sidewall of the connecting holes through a lifting cylinder. A V-shaped frame is set between the two lifting platforms through a connecting column. The thickness of the V-shaped frame gradually decreases from bottom to top, and there is a gap between adjacent V-shaped frames for falling chips.

[0012] Preferably, the pushing mechanism includes multiple positioning cylinders mounted on the machine body, each positioning cylinder corresponding to a multiple tap position, and multiple circumferentially evenly distributed electromagnetic rods are mounted on the side of the positioning cylinder near the tap via an electrode block.

[0013] Preferably, the clamping mechanism includes multiple actuators slidably mounted on the lower end of the support frame. Each actuator includes two symmetrically distributed chucks with a transverse U-shaped cross-section. A storage space for accommodating the nut to be cut is formed between the two chucks, and the two chucks have notches on the side near the tap that allow the nut to be pushed out.

[0014] Preferably, the inner wall of the chuck is symmetrically provided with two vertical clamping bars, and the inside of the chuck is provided with multiple movable slots at equal intervals from top to bottom. The side wall of the vertical clamping bars is provided with displacement plates that are slidably assembled in the movable slots. Multiple first double-ended screws are rotatably installed on the chuck, and the first double-ended screws pass through the displacement plates by means of threaded connection. A positioning plate is provided in the middle of the movable groove, and a telescopic baffle is installed between the positioning plate and the two displacement plates to cover the movable groove and prevent the nut from getting stuck at the groove opening when it falls downwards.

[0015] Preferably, a guide telescopic plate is rotatably installed between the upper end of the vertical clamping bar and the inner wall of the clamp via a pin, which is used to guide the nut that falls into the storage space, so that the nut falls smoothly between the two vertical clamping bars.

[0016] Preferably, the side wall of the chuck is also equipped with a support bar, and two vertical plates are symmetrically arranged at the upper end of the support platform along each execution group. Two second double-ended screws are rotatably installed between the two vertical plates, and the second double-ended screws pass through the support bar by means of threaded connection.

[0017] In summary, this application includes the following beneficial technical effects: 1. This invention injects coolant into the cutting area of ​​the tap and nut inner hole to provide cooling, lubrication, and chip removal for dead corners that cannot be irrigated by external coolant. This effectively prevents residual chips from affecting cutting accuracy and can work in conjunction with externally sprayed coolant to provide all-round cooling and lubrication for the tap and nut inner hole. After the chips on the outer wall of the tap and in the thread groove of the nut inner hole are lubricated, they can be removed during tap cutting and retraction, ensuring the smoothness of the thread groove and the dimensional accuracy of the nut inner thread.

[0018] 2. This invention, through the cooperation of the V-shaped bracket and the electromagnetic rod, can limit the nut when the tap is cutting the nut, so as to prevent the nut from rotating and affecting the tapping. In addition, the electromagnetic rod can attract and limit the nut when the tap is retracted, so as to prevent the tap from being unable to retract. After the electromagnetic rod is de-energized, the nut will fall off automatically.

[0019] 3. This invention can adaptively adjust the chuck and vertical clamping bars according to the outer diameter and thickness of the nut. That is, the spacing of the vertical clamping bars can be adjusted to adapt to nuts of different thicknesses, and the spacing of the chucks can be adjusted to adapt to nuts of different outer diameters, so as to facilitate tapping nuts of different specifications. Moreover, the rapid adjustment can effectively replace the traditional changeover method and greatly improve production efficiency. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure between the tapping mechanism and the pushing mechanism of the present invention; Figure 3 This is the present invention. Figure 2 A magnified view of a portion of point A; Figure 4 This is a schematic diagram of the tapping mechanism of the present invention; Figure 5 This is the present invention. Figure 4 A magnified view of section B; Figure 6 This is the present invention. Figure 4 A magnified view of a portion at point C; Figure 7 This is a schematic diagram of the structure between the support platform and the V-shaped frame of the present invention; Figure 8 This is a schematic diagram of the clamping mechanism of the present invention; Figure 9 This is the present invention. Figure 8 A magnified view of a portion at point D; Figure 10 This is a schematic diagram of the structure between the support bar, the vertical plate, and the second double-ended screw of the present invention.

[0022] In the diagram, 1. fuselage; 11. support platform; 12. connecting hole; 13. lifting cylinder; 14. lifting platform; 15. connecting column; 16. V-shaped frame; 2. Spindle box; 3. Support frame; 4. Clamping mechanism; 41. Chuck; 411. Support bar; 412. Vertical plate; 413. Second double-ended screw; 414. Forward and reverse motor; 42. Vertical clamping bar; 421. Guide telescopic plate; 43. Movable groove; 44. Displacement plate; 45. First double-ended screw; 46. Servo motor; 47. Positioning plate; 48. Telescopic baffle; 5. Tapping mechanism; 51. Rotating shaft; 52. Tap; 53. Auxiliary unit; 531. Strip groove; 532. Empty groove; 533. Drain hole; 534. Chip guard; 535. Through hole; 536. Annular cylinder; 537. Annular notch; 538. Connecting pipe; 539. Telescopic cylinder; 6. Pushing mechanism; 61. Positioning cylinder; 62. Electrode block; 63. Electromagnetic rod. Detailed Implementation

[0023] The following is in conjunction with the appendix Figures 1-10 The embodiments of the present invention will be described in detail below.

[0024] This application discloses a nut internal cooling and lubrication chip removal tapping device. It should be noted that this application is mainly used in the process of tapping the inner hole of a nut. In terms of technical effect, it can inject coolant into the cutting area of ​​the tap 52 and the inner hole of the nut to provide cooling, lubrication and chip removal for the dead corner area that cannot be sprayed by external coolant, effectively preventing chip residue from affecting cutting accuracy. It can also work with external spray coolant to provide all-round cooling and lubrication for the tap 52 and the inner hole of the nut. Furthermore, this application can also adaptively adjust according to the thickness and outer diameter of the nut to facilitate tapping nuts of different specifications.

[0025] Reference Figure 1 , Figure 2 and Figure 4 As shown, a nut internal cooling and lubrication chip removal tapping device includes a machine body 1, a clamping mechanism 4, a tapping mechanism 5, and a pushing mechanism 6 mounted on the machine body 1. A spindle box 2 is provided at the upper end of the machine body 1. The tapping mechanism 5 is mounted on the side wall of the spindle box 2. A driving component (not shown in the figure) for driving the tapping mechanism 5 is provided inside the spindle box 2. A support frame 3 located above the tapping mechanism 5 is also provided on the side wall of the spindle box 2. The clamping mechanism 4, which works in conjunction with the tapping mechanism 5, is installed at the lower end of the support frame 3. The clamping mechanism 4 is used to support the nuts to be tapped stacked from top to bottom. The clamping mechanism 4 can adaptively adjust according to nuts of different thicknesses and outer diameters; the tapping mechanism 5 is used to tap the nuts clamped in the clamping mechanism 4; the pushing mechanism 6 is used to push the nuts that fall from the clamping mechanism 4 to the tap 52 side, so that the nuts are fitted onto the outer wall of the tap 52 for tapping; wherein, the tapping mechanism 5 includes several rotating shafts 51 rotatably mounted on the side wall of the spindle box 2, and the ends of the rotating shafts 51 are provided with taps 52 for tapping. The taps 52 are equipped with auxiliary units 53 for internal cooling, lubrication and chip removal to ensure tapping accuracy.

[0026] In actual operation, the nuts to be tapped are stacked and placed into the clamping mechanism 4. Under the action of gravity, the nuts fall downwards to the tapping station. Then, the drive component inside the spindle box 2 controls the rotation of the rotating shaft 51 and the tap 52. Subsequently, the pushing mechanism 6 pushes the nut at the tapping station toward one side of the tap 52, so that the end of the tap 52 abuts against the inner wall of the nut's hole. The nut and the tap 52 rotate relative to each other. Thus, under the combined action of the rotation of the tap 52 and the pushing of the nut, the tap 52 cuts into the inner hole of the nut. The internal thread is cut to conform to the predetermined specifications. During the tapping process, the auxiliary unit 53 can inject coolant into the tap 52 and the inner hole of the nut to provide cooling and lubrication for the dead corner parts that cannot be rinsed externally. This can prevent the tap 52 from overheating and affecting its cutting performance, prevent chips from remaining in the thread groove on the surface of the tap 52 and affecting the cutting accuracy, and flush away the chips stuck in the inner hole of the nut. This, together with the external rinsing coolant on the machine body 1, provides all-round cooling and lubrication for the tap 52 and the inner hole of the nut.

[0027] After tapping is completed, the auxiliary unit 53 drives the rotating shaft 51 and the tap 52 to retract towards one side of the spindle box 2. The tap 52 drives the nut on its outer wall to move synchronously, causing the nut to move out of the tapping station. Then, the drive component controls the rotating shaft 51 and the tap 52 to rotate in opposite directions, causing the tap 52 to retract. At the same time, the pushing mechanism 6 limits and fixes the nut to ensure the normal retraction. After the tap 52 retracts, the pushing mechanism 6 releases the limit on the nut, causing the nut to fall into the collection hopper on the other side of the machine body 1, completing the automatic unloading. In addition, the machine body 1 has multiple sets of clamping mechanisms 4, tapping mechanisms 5 and pushing mechanisms 6, which can complete the tapping of multiple nuts at the same time, thereby effectively improving work efficiency.

[0028] Reference Figure 4 , Figure 5 and Figure 6 As shown, in order to ensure tapping accuracy, in this embodiment, the auxiliary unit 53 includes two symmetrically formed strip grooves 531 on the surface of the tap 52. The length direction of the strip grooves 531 is parallel to the axis of the tap 52. A hollow groove 532 is formed inside the tap 52. Multiple drainage holes 533 are formed at equal intervals between the strip grooves 531 and the hollow grooves 532. A chip shield 534 is provided on the side of the drainage hole 533 away from the hollow groove 532 to block the chips generated during the cutting process and prevent the chips from entering the drainage hole 533 and causing blockage.

[0029] Furthermore, in this embodiment, an annular groove is formed on the outer wall of the tap 52 near the rotating shaft 51. Multiple through holes 535, communicating with the empty groove 532, are uniformly formed on the inner wall of the annular groove. An annular cylinder 536 is rotatably fitted onto the outer wall of the annular groove. An annular notch 537, communicating with the multiple through holes 535, is formed on the inner wall of the annular cylinder 536. A connecting pipe 538 is provided on the outer wall of the annular cylinder 536 for connecting an external pump body to inject coolant into the annular cylinder 536. An annular sealing ring (not shown in the figure) is provided between the annular cylinder 536 and the annular groove to compensate for the gap between the annular cylinder 536 and the annular groove, preventing coolant leakage. Since the connecting pipe 538 on the outer wall of the annular cylinder 536 cannot rotate, the annular cylinder 536 rotates relative to the tap 52. Therefore, the annular sealing ring is preferably made of a wear-resistant material.

[0030] It should be further explained that a telescopic cylinder 539 is provided at one end of the rotating shaft 51 near the tap 52. The output end of the telescopic cylinder 539 is connected to the tap 52 through a linkage shaft, and a limit stop is provided between the output end of the telescopic cylinder 539 and the cylinder barrel, so that the output end of the telescopic cylinder 539 can only move along the axial direction and cannot rotate relative to the cylinder barrel. This is used to assist the rotating shaft 51 in transmitting torque to the tap 52. In the initial state, the output end of the telescopic cylinder 539 drives the tap 52 to the tapping position.

[0031] During operation, the pushing mechanism 6 pushes the nut at the tapping station to the end of the tap 52 for tapping. During this period, the external pump injects coolant into the annular cylinder 536 through the connecting pipe 538. The coolant in the annular cylinder 536 is injected into the empty groove 532 through the annular notch 537 and the through hole 535, and then discharged into the strip groove 531 through the drain hole 533. With the continuous injection of coolant and the rotation of the tap 52, the coolant in the strip groove 531 can be evenly filled in the cutting area, thereby cooling and lubricating the tap 52 and the nut. In addition, it can also flush out the chips stuck in the cutting area, preventing the chips from affecting the cutting accuracy and thread finish.

[0032] After tapping is completed, the telescopic cylinder 539 is activated. The telescopic cylinder 539 drives the tap 52 and the nut on its outer wall to move towards the side closer to the rotating shaft 51, moving the nut out of the tapping station. Then the drive component controls the tap 52 to rotate in the opposite direction, and cooperates with the pushing mechanism 6 to make the tap 52 retract, so that the nut can be unloaded.

[0033] It should be further explained that, since the telescopic cylinder 539 needs to rotate with the shaft 51 and the tap 52, the circuit and air circuit of the telescopic cylinder 539 are connected to the outside through a rotary joint and a conductive slip ring, respectively, to ensure the energy supply of the telescopic cylinder 539. In addition, when injecting coolant into the strip groove 531, no pressure is required; it is only necessary to ensure its normal outflow to achieve the purpose of cooling, lubrication, and chip removal. Therefore, the annular sealing ring between the annular cylinder 536 and the annular groove will not bear the pressure of the coolant, and there will be no leakage. After the chips on the outer wall of the tap 52 and the inner thread groove of the nut are lubricated, they can be removed from themselves and the inner hole of the nut during the cutting and retraction of the tap 52, ensuring the smoothness of the thread and the dimensional accuracy of the inner thread of the nut.

[0034] Reference Figure 7 As shown, in order to facilitate the tap 52 to accurately tap the nut, in this embodiment, a support platform 11 located below the clamping mechanism 4 is installed on the machine body 1. The support platform 11 has multiple connecting holes 12 corresponding to the positions of the tap 52. Two lifting platforms 14 are installed on the bottom side wall of the connecting holes 12 through the lifting cylinder 13. A V-shaped frame 16 is set between the two lifting platforms 14 through the connecting column 15. The thickness of the V-shaped frame 16 gradually decreases from bottom to top, and there is a gap between adjacent V-shaped frames 16 for falling chips.

[0035] In actual operation, the nut inside the clamping mechanism 4 falls downward onto multiple V-shaped supports 16, i.e., the tapping station. The V-shaped supports 16 can support the nut, so that the axis of the nut's inner hole and the axis of the tap 52 are in the same vertical plane. In addition, the lifting cylinder 13 can control the V-shaped supports 16 to move up and down through the lifting platform 14, thereby adaptively adjusting according to the size of the nut, so that the axis of the nut's inner hole coincides with the axis of the tap 52.

[0036] Reference Figure 2 and Figure 3 As shown, in order to facilitate pushing the nut toward the tap 52 and removing the nut from the tap 52, in this embodiment, the pushing mechanism 6 includes a plurality of positioning cylinders 61 disposed on the machine body 1. The positioning cylinders 61 correspond to the positions of the plurality of taps 52. On the side of the positioning cylinders 61 near the tap 52, a plurality of circumferentially evenly distributed electromagnetic rods 63 are disposed through the electrode block 62.

[0037] In actual operation, after the nut is adjusted on the V-shaped bracket 16 to be coaxial with the tap 52, the positioning cylinder 61 is activated. The positioning cylinder 61 pushes the nut towards the tap 52 via the solenoid rod 63, allowing the tap 52 to insert into the inner hole of the nut. During this period, the outer wall of the nut is limited by the V-shaped bracket 16, and the end face of the nut is pressed and limited by the solenoid rod 63, thus keeping the nut in a state where it cannot rotate during tapping. This allows the tap 52 to rotate relative to the nut, facilitating tapping within the nut's inner hole. The chips generated during tapping fall through the gaps between adjacent V-shaped brackets 16 and the connecting hole 12. After tapping is completed, the telescopic cylinder 539 and the positioning cylinder 61 operate simultaneously. That is, while the telescopic cylinder 539 moves the tap 52 and the nut closer to the spindle box 2, the positioning cylinder 61 drives the electromagnetic rod 63 to move synchronously with the nut. During this period, the electrode block 62 is activated, which energizes the electromagnetic rod 63, causing the electromagnetic rod 63 to attract the nut and limit the rotation direction of the nut. After the nut is completely removed from the tapping station, the drive component controls the tap 52 to reverse, and the telescopic cylinder 539 then controls the tap 52 to move slowly closer to the spindle box 2. In this way, the tap 52 is unscrewed from the inner hole of the nut to achieve tool retraction. Then, the electrode block 62 de-energizes the electromagnetic rod 63, which releases the magnetic attraction effect on the nut, allowing the nut to fall into the collection hopper.

[0038] It should be noted that since the nut is kept on the same axis as the tap 52 during tapping, moving out of the tapping machine, and retracting of the tap 52, and the tap 52 and the nut are lubricated and chip removed by internal and external coolant, there will be no jamming between the tap 52 and the nut during the reverse retraction process, that is, the nut will not fall off the electromagnetic rod 63.

[0039] Reference Figure 8 , Figure 9 and Figure 10 As shown, in order to be able to cut nuts of different specifications, in this embodiment, the clamping mechanism 4 includes multiple execution groups that are slidably mounted on the lower end of the support frame 3. The multiple execution groups correspond to the positions of the tap 52. Each execution group includes two symmetrically distributed chucks 41. The chucks 41 are slidably mounted on the upper end of the support platform 11. The cross-section of the chucks 41 is a transverse U-shaped structure. A storage space for accommodating the nuts to be cut is formed between the two chucks 41. The side of the two chucks 41 near the tap 52 has a notch that can push the nut out.

[0040] Furthermore, in this embodiment, two vertical clamping bars 42 are symmetrically arranged on the inner wall of the chuck 41. The two vertical clamping bars 42 are used to abut against the two end faces of the nut. Multiple movable slots 43 are equally spaced from top to bottom inside the chuck 41. Displacement plates 44 are slidably assembled in the movable slots 43 on the side walls of the vertical clamping bars 42. Multiple first double-ended screws 45 are rotatably mounted on the chuck 41. The first double-ended screws 45 pass through the displacement plates 44 by threaded connection. The multiple first double-ended screws 45 are connected to each other by belt drive. A servo motor 46 connected to any one of the first double-ended screws 45 is arranged on the outer wall of the chuck 41 through a motor mount. A positioning plate 47 is provided in the middle of the movable slot 43. The first double-ended screws 45 rotate through the positioning plate 47. A telescopic baffle 48 is installed between the positioning plate 47 and the two displacement plates 44 to block the movable slot 43 and prevent the nut from getting stuck at the opening of the movable slot 43 when it falls downward.

[0041] It should be noted that a guide telescopic plate 421 is rotatably installed between the upper end of the vertical clamping bar 42 and the inner wall of the clamp 41 via a pin, which is used to guide the nut that falls into the storage space so that the nut falls smoothly between the two vertical clamping bars 42; in addition, a feeding pipe connected to the storage space is installed on the support frame 3.

[0042] Furthermore, in this embodiment, a support bar 411 is also installed on the side wall of the chuck 41. Two vertical plates 412 are symmetrically arranged on the upper end of the bearing platform 11 along each execution group. Two second double-ended screws 413 are rotatably installed between the two vertical plates 412. The second double-ended screws 413 pass through the support bar 411 by means of threaded connection. The two second double-ended screws 413 are connected by belt drive. A forward and reverse motor 414 connected to any one of the second double-ended screws 413 is installed on one of the vertical plates 412 through a motor cover.

[0043] In actual operation, when the chuck 41 needs to be adjusted according to different specifications of nuts, the servo motor 46 is started. The servo motor 46 drives the first double-ended screw 45 to rotate. The first double-ended screw 45 drives the vertical clamping bars 42 to move relative to each other or in opposite directions through the displacement plate 44, thereby adjusting the spacing of the vertical clamping bars 42 at both ends of the nut so as to adapt to the thickness of the nut. When adjusting the vertical clamping bars 42, the vertical clamping bars 42 drive the telescopic baffle 48 and the guide telescopic plate 421 to extend and retract adaptively to ensure that the nut is always guided.

[0044] In addition, the forward and reverse motor 414 is started, which drives the second double-ended screw 413 to rotate. The second double-ended screw 413 drives the two chucks 41 to move relative to each other or in opposite directions through the support bar 411, thereby adjusting the spacing of the chucks 41 that clamp the outer wall of the nut. It can be adaptively adjusted according to the outer diameter of the nut, thus adapting to nuts of different specifications.

[0045] To accommodate nuts of different specifications, the tap 52 is preferably a detachable splicing structure. The head is a tapping part that performs the cutting operation, and the tail is a transmission part that is rotatably connected to the annular cylinder 536 and fixedly connected to the rotating shaft 51. The tapping part has different diameters to accommodate the different diameter inner holes of nuts of different specifications. The tapping parts of different diameters are all provided with slots 532. After the tap 52 is spliced, the slots 532 of the tapping part and the transmission part are sealed and connected.

[0046] During operation: Step 1: The nuts to be tapped are stacked and placed into the storage space of the chuck 41. Under the action of gravity, the nuts fall downwards to the upper end of the V-shaped bracket 16 of the tapping station.

[0047] Step 2: The drive components inside the spindle box 2 control the rotation of the shaft 51 and the tap 52. Then, the positioning cylinder 61 is activated. The positioning cylinder 61 pushes the nut toward the tap 52 via the solenoid rod 63, so that the tap 52 is inserted into the inner hole of the nut. During this period, the nut cannot rotate under the action of the V-shaped frame 16 and the solenoid rod 63. Therefore, the tap 52 rotates relative to the nut, which facilitates the tap 52 tapping the inner hole of the nut. The chips generated during tapping fall through the gaps of the adjacent V-shaped frame 16 and the connecting hole 12.

[0048] Step 3: During the tapping process, the external pump body injects coolant into the annular cylinder 536 through the connecting pipe 538. The coolant in the annular cylinder 536 is injected into the empty groove 532 through the annular notch 537 and the through hole 535, and then discharged into the strip groove 531 through the drain hole 533. With the continuous injection of coolant and the rotation of the tap 52, the coolant in the strip groove 531 can be evenly filled in the cutting area, thereby cooling and lubricating the tap 52 and the nut. This can prevent the tap 52 from overheating and affecting its cutting performance, and can also prevent chips from remaining in the thread groove on the surface of the tap 52 and affecting the cutting accuracy. It can also flush off the chips stuck in the inner hole of the nut, thus working with the external flushing coolant on the machine body 1 to provide all-round cooling and lubrication for the tap 52 and the inner hole of the nut.

[0049] Step 4: After tapping is completed, activate the telescopic cylinder 539. The telescopic cylinder 539 drives the tap 52 and the nut on its outer wall to move towards the side closer to the rotating shaft 51, moving the nut out of the tapping station. Then, activate the electrode block 62, which energizes the electromagnetic rod 63. The electromagnetic rod 63 attracts and limits the nut. Subsequently, the drive component controls the tap 52 to reverse, and the telescopic cylinder 539 controls the tap 52 to slowly move towards the side closer to the spindle box 2, so that the tap 52 is unscrewed from the inner hole of the nut. Then, the electrode block 62 de-energizes the electromagnetic rod 63, which releases the magnetic attraction to the nut, allowing the nut to fall into the collection hopper.

[0050] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

[0051] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A tapping device for internal cooling, lubrication, and chip removal in nuts, characterized in that, It includes a machine body (1), a clamping mechanism (4), a tapping mechanism (5) and a pushing mechanism (6) installed on the machine body (1); a spindle box (2) is provided at the upper end of the machine body (1), the tapping mechanism (5) is installed on the side wall of the spindle box (2), a support frame (3) is provided on the side wall of the spindle box (2), and a clamping mechanism (4) that works in conjunction with the tapping mechanism (5) is installed at the lower end of the support frame (3); The clamping mechanism (4) is used to carry nuts to be tapped stacked from top to bottom. The clamping mechanism (4) can be adaptively adjusted according to nuts of different thicknesses and outer diameters. The tapping mechanism (5) is used to tap the nut held in the clamping mechanism (4); The tapping mechanism (5) includes several rotating shafts (51) rotatably mounted on the side wall of the spindle box (2). The ends of the rotating shafts (51) are provided with taps (52) for tapping. The taps (52) are equipped with auxiliary units (53) for internal cooling and lubrication chip removal to ensure tapping accuracy. The pushing mechanism (6) is used to push the nut that has fallen from the clamping mechanism (4) toward the tap (52) so that the nut is fitted onto the outer wall of the tap (52) for tapping.

2. The nut internal cooling and lubrication chip removal tapping device according to claim 1, characterized in that: The auxiliary unit (53) includes two symmetrical strip grooves (531) on the surface of the tap (52), and a hollow groove (532) is provided inside the tap (52). Multiple drain holes (533) are provided at equal intervals between the strip grooves (531) and the hollow groove (532). A chip shield (534) is provided on the side of the drain hole (533) away from the hollow groove (532).

3. The nut internal cooling and lubrication chip removal tapping device according to claim 2, characterized in that: The tap (52) has an annular groove on the side of its outer wall near the rotating shaft (51). The inner wall of the annular groove has a plurality of through holes (535) that communicate with the empty groove (532) evenly distributed around its circumference. An annular cylinder (536) is rotatably fitted on the outer wall of the annular groove. The inner wall of the annular cylinder (536) has an annular notch (537) that communicates with the plurality of through holes (535). A connecting pipe (538) is provided on the outer wall of the annular cylinder (536) for connecting an external pump body to inject coolant into the annular cylinder (536).

4. The nut internal cooling and lubrication chip removal tapping device according to claim 1, characterized in that: A telescopic cylinder (539) is provided at one end of the rotating shaft (51) near the tap (52). The output end of the telescopic cylinder (539) is connected to the tap (52) through a linkage shaft, and a limit stop is provided between the output end of the telescopic cylinder (539) and the cylinder barrel.

5. The nut internal cooling and lubrication chip removal tapping device according to claim 1, characterized in that: The machine body (1) is equipped with a support platform (11) located below the clamping mechanism (4). The support platform (11) has multiple connecting holes (12) corresponding to the positions of the tap (52). The bottom side wall of the connecting hole (12) is equipped with two lifting platforms (14) through the lifting cylinder (13). A V-shaped frame (16) is set between the two lifting platforms (14) through the connecting column (15). The thickness of the V-shaped frame (16) gradually decreases from bottom to top, and there is a gap between adjacent V-shaped frames (16) for falling chips.

6. The nut internal cooling and lubrication chip removal tapping device according to claim 1, characterized in that: The pushing mechanism (6) includes multiple positioning cylinders (61) mounted on the body (1). The positioning cylinders (61) correspond to the positions of multiple taps (52). On the side of the positioning cylinder (61) close to the taps (52), multiple electromagnetic rods (63) are evenly distributed in the circumference through the electrode block (62).

7. The nut internal cooling and lubrication chip removal tapping device according to claim 1, characterized in that: The clamping mechanism (4) includes multiple actuators that are slidably mounted on the lower end of the support frame (3). Each actuator includes two symmetrically distributed chucks (41). The cross-section of each chuck (41) is a transverse U-shaped structure. A storage space for accommodating the nut to be cut is formed between the two chucks (41), and the two chucks (41) have a notch on the side near the tap (52) that can push the nut out.

8. The nut internal cooling and lubrication chip removal tapping device according to claim 7, characterized in that: The inner wall of the chuck (41) is symmetrically provided with two vertical clamping bars (42). The inside of the chuck (41) is provided with multiple movable slots (43) at equal intervals from top to bottom. The side wall of the vertical clamping bars (42) is provided with a displacement plate (44) that is slidably assembled in the movable slot (43). Multiple first double-ended screws (45) are rotatably installed on the chuck (41). The first double-ended screws (45) pass through the displacement plate (44) by means of threaded connection. A positioning plate (47) is provided in the middle of the movable groove (43). A telescopic baffle (48) is installed between the positioning plate (47) and the two displacement plates (44) to cover the movable groove (43) and prevent the nut from getting stuck at the opening of the movable groove (43) when it falls downward.

9. The nut internal cooling and lubrication chip removal tapping device according to claim 8, characterized in that: A guide telescopic plate (421) is rotatably installed between the upper end of the vertical clamp (42) and the inner wall of the clamp (41) via a pin. This guide plate is used to guide the nut that falls into the storage space, so that the nut falls smoothly between the two vertical clamps (42).

10. The nut internal cooling and lubrication chip removal tapping device according to claim 7, characterized in that: The side wall of the chuck (41) is also equipped with a support bar (411). Two vertical plates (412) are symmetrically arranged at the upper end of the bearing platform (11) along each execution group. Two second double-headed screws (413) are rotatably installed between the two vertical plates (412). The second double-headed screws (413) pass through the support bar (411) by means of threaded connection.

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