A continuous machining equipment for internal threads of nuts

Abstract

This application relates to a continuous machining equipment for internal threads of nuts, belonging to the technical field of automated machining equipment. The machining equipment includes a frame, on which a tapping seat, an automatic feeding mechanism, and a pushing mechanism are mounted. The tapping seat has an anti-rotation hole. The automatic feeding mechanism has a discharge port that is directly opposite and connected to the anti-rotation hole. A main shaft is rotatably mounted on the frame, and a rotation driver is mounted on the frame, which is drively connected to the main shaft. A feed through hole is coaxially opened on the main shaft, and a through groove is opened at one end of the main shaft. One end of the through groove is connected to the feed through hole along its own length, and the other end is radially through the main shaft. A machining tap includes a smooth section, which is coaxially disposed in the feed through hole. A tap section is coaxially fixedly connected to one end of the smooth section, and the other end is bent to form a bent section located in the through groove. The tap section is coaxially disposed in the anti-rotation hole. This application can realize continuous machining of batch nuts.

Description

Technical Field

[0001] This application relates to the technical field of automated processing equipment, and in particular to a continuous processing equipment for internal threads of nuts. Background Technology

[0002] In the field of metal processing, internal threads are an indispensable structural feature in fastener manufacturing, widely used in the production of standard parts such as nuts and threaded holes. The main methods for machining internal threads include turning, milling, rolling, and tapping. Among these, tapping is currently the most widely used method for machining internal threads due to its simple process, reliable machining accuracy, and relatively low equipment cost, especially dominating the mass production of standard fasteners such as nuts.

[0003] Currently, machining the internal threads of nuts using taps typically involves multiple steps, including clamping and positioning, tap feeding and cutting, tap reversal and withdrawal, and unloading. In common nut internal thread machining equipment, these steps are relatively independent and mostly intermittent: after tapping each nut, the tap must be withdrawn from the nut in reverse, the machined nut removed from the fixture, and then the next nut to be machined must be clamped before the next round of tapping can begin. Even in semi-automatic equipment equipped with automatic loading and unloading mechanisms, there is still an unavoidable waiting time between tap retraction and nut replacement, resulting in an intermittent cyclical processing pattern.

[0004] The aforementioned intermittent cycle mode results in a large amount of non-cutting idle travel time for the tap during the machining cycle. In particular, the tap reversal and exit and nut loading and unloading replacement occupy a considerable proportion of auxiliary time, resulting in a low proportion of effective cutting time for the tap. This restricts the machining efficiency of large batches of nuts. Summary of the Invention

[0005] This application provides a continuous machining equipment for internal threads of nuts, the purpose of which is to continuously process a batch of nuts, thereby improving the processing efficiency of large batches of nuts.

[0006] The technical solution of the continuous machining equipment for internal threads of nuts provided in this application is as follows: A continuous machining equipment for internal threads of nuts includes a frame, on which a tapping seat, an automatic feeding mechanism, and a pushing mechanism are mounted. The tapping seat has an anti-rotation hole. The automatic feeding mechanism has a discharge port that communicates directly with the anti-rotation hole, and is used to automatically feed nuts to the discharge port. The pushing mechanism pushes the nuts from the discharge port into the anti-rotation hole. A main shaft is rotatably mounted on the frame, and a rotation driver is mounted on the frame, the rotation driver being connected to the main shaft for power transmission. Connection; a feed through hole is coaxially opened on the main shaft, a through groove is opened at one end of the main shaft, one end of the through groove is connected to the feed through hole along its own length direction, and the other end passes through the main shaft radially; a machining tap includes a smooth rod section, the smooth rod section is coaxially arranged in the feed through hole, one end of the smooth rod section is coaxially fixedly connected to a tap section, and the other end is bent to form a bent section, the bent section is located in the through groove, the length direction of the bent section is arranged along the length direction of the through groove, and the tap section is coaxially arranged in the anti-rotation hole.

[0007] By adopting the above technical solution, when machining the internal thread of a nut, the rotary drive drives the spindle to rotate. Since the bent section of the machining tap is located in the through groove at one end of the spindle, the groove wall generates a circumferential driving force on the bent section when the through groove rotates with the spindle, thereby causing the entire machining tap to rotate synchronously with the spindle. The nut to be machined is conveyed to the discharge port by the automatic feeding mechanism and then pushed into the anti-rotation hole of the tap seat by the pushing mechanism. As the pushing mechanism pushes the nut to move towards the tap section in the anti-rotation hole, the nut is constrained within the anti-rotation hole and cannot rotate with the tap section because the cross-sectional profile of the anti-rotation hole matches the outer profile of the nut. Therefore, the rotating tap section cuts the internal thread on the inner wall of the nut. As the pushing mechanism continues to advance the nut along the axial direction of the tap section, the thread profile of the tap section gradually completes the cutting of the entire thread on the inner wall of the nut until the internal thread of the nut is completed. Then, the nut passes over the tap section, is fitted onto the smooth rod section, and enters the conveying through hole.

[0008] When machining the internal threads of nuts in batches, the tapping process described above is repeated. The automatic feeding mechanism continuously transports the nuts to be processed to the discharge port, and the pushing mechanism sequentially pushes the nuts one by one into the anti-rotation holes for tapping. After the newly pushed-in nut completes its own tapping and enters the feed through hole, it generates an axial thrust on the previously processed nuts that are resting on the smooth rod section, causing the previous nuts to move continuously along the smooth rod section towards the bending section. When the nut reaches the connection between the smooth rod section and the bending section, under the continuous thrust of the subsequent nuts and the guiding action of the smooth rod section, the corresponding nut will move to the bending section. At this time, under the centrifugal force generated by the rotation of the spindle, the nut will continue to move along the bending section, and then detach from the bending section through the through groove and be thrown out.

[0009] Therefore, the tap rotates continuously in the same direction throughout the machining process, eliminating the need for reverse retraction. The machined nuts are automatically conveyed and discharged under the continuous pushing action of subsequent nuts, thus achieving continuous and uninterrupted machining of batches of nuts, which improves the machining efficiency of large batches of nuts.

[0010] Optionally, a sealing disc is coaxially disposed at one end of the main shaft where the through groove is provided, and the sealing disc is detachably connected to the main shaft.

[0011] By adopting the above technical solution, a sealing disc is coaxially installed at one end of the spindle with a through groove. The sealing disc covers and seals the open area of ​​the end face where the through groove is located. On the one hand, this can limit the axial runout of the machining tap and prevent the machining tap from detaching from the spindle. On the other hand, the sealing disc can prevent debris from entering the spindle through the through groove and the feed hole. At the same time, the sealing disc is detachably connected to the spindle, so that the sealing disc can be removed to expose the through groove and the feed hole, facilitating the removal and replacement of the machining tap.

[0012] Optionally, the sealing disc has a replacement groove, the length of which is along the length of the through groove. The replacement groove extends through the sealing disc along the axial direction of the main shaft, and the conveying through hole and the through groove are both connected to the replacement groove. A cover plate is inserted into the replacement groove to close it. The cover plate is along the length of the replacement groove. One end of the cover plate is rotatably connected to the sealing disc, and a locking element is provided between the other end of the cover plate and the main shaft.

[0013] By adopting the above technical solution, a replacement slot is created on the sealing disc, which connects to both the conveying through hole and the through groove. This forms an operating channel that allows direct access to the machining tap without disassembling the sealing disc. When the machining tap needs to be replaced due to wear, the operator only needs to release the locking mechanism on the cover plate, flip the cover plate open, and remove the entire machining tap for replacement. After replacing the machining tap, the cover plate is flipped back into place and re-locked by the locking mechanism. This design can shorten the downtime required for machining tap replacement operations.

[0014] Optionally, the system also includes a receiving mechanism, which includes a receiving ring fixedly connected to the frame. The receiving ring is coaxially sleeved on the outside of the main shaft and spaced apart from the main shaft. The bent section is located inside the receiving ring. A discharge port is provided through the receiving ring and is located vertically below the main shaft. A sealing cap is detachably connected to one end of the receiving ring that is away from the frame along its own axial direction, and the sealing cap closes the receiving ring.

[0015] By adopting the above technical solution, the processed nuts are thrown out by the centrifugal force generated by the rotation of the spindle. At this time, the design of the receiving ring ensures that the thrown nuts are intercepted by the inner wall of the receiving ring and confined inside the receiving ring, preventing the nuts from splashing outwards. The sealing cap further prevents the nuts from flying out from the end face of the receiving ring, ensuring the sealing effect of the receiving ring.

[0016] The discharge port on the receiving ring is located below the main shaft in the vertical direction. This allows the nuts, which lose horizontal kinetic energy after being intercepted, to slide down naturally to the discharge port under their own gravity and be discharged from the receiving ring, thus realizing the automatic collection and orderly discharge of finished nuts.

[0017] Optionally, the inner wall of the receiving ring is provided with a plurality of buffer tiles, which are arranged sequentially along the circumference of the receiving ring.

[0018] By adopting the above technical solution, since the nut thrown out from the main shaft will hit the inner wall of the receiving ring at a high instantaneous speed, several buffer tiles are set on the inner wall of the receiving ring so that when the nut is thrown out, it can hit the buffer tiles instead of directly hitting the metal inner wall of the receiving ring. The buffer tiles absorb and buffer the impact energy to reduce the peak impact force at the moment of collision, thereby reducing the impact damage to the finished nut.

[0019] Optionally, the buffer tile includes a mounting base and a collision plate. The mounting base is fixed on the inner wall of the receiving ring. The collision plate is located on the side of the mounting base facing the main shaft and is arranged parallel to and spaced apart from the mounting base. An elastic buffer seat is provided between the collision plate and the mounting base, and an elastic buffer layer is provided on the side of the collision plate away from the elastic buffer seat.

[0020] By adopting the above technical solution, when the nut impacts the collision plate, the collision plate can elastically displace towards the mounting base under the flexible support of the elastic buffer seat. The elastic buffer seat continuously absorbs the kinetic energy of the nut during the compression stroke, transforming the originally instantaneous high-speed rigid collision into a gradual elastic deceleration process with a certain stroke, thus prolonging the collision action time and reducing the peak impact force during the collision process. At the same time, the elastic buffer layer provides flexible deformation buffering at the initial moment of contact between the nut and the collision plate, avoiding local stress concentration and surface damage caused by direct hard contact between the outer surface of the nut and the rigid surface of the collision plate.

[0021] Thus, the elastic buffer layer and the elastic buffer seat form a series of two-stage buffer energy absorption structures during the collision: the first stage is the absorption of surface deformation energy provided by the elastic buffer layer, which mitigates the contact stress on the nut surface through localized material deformation in the initial contact stage; the second stage is the absorption of overall compression stroke energy provided by the elastic buffer seat, which consumes the remaining kinetic energy of the nut through the compressive deformation of the elastic component in the deeper stage of the collision. The synergistic effect of the two-stage buffer allows the impact energy to be absorbed and dissipated more fully and evenly throughout the entire collision process, thereby further reducing the degree of impact damage to the surface and internal threads of the finished nut.

[0022] Optionally, the elastic buffer layer includes a flexible layer, an intermediate layer, and a rigid layer stacked sequentially, the rigid layer being bonded to the collision plate, and the hardness of the flexible layer, the intermediate layer, and the rigid layer increasing sequentially.

[0023] By adopting the above technical solution, under the layered structure design of the elastic buffer layer, when the nut impacts the elastic buffer layer, the nut first contacts the flexible layer. The flexible layer has the lowest hardness and the strongest elastic deformation capacity, and can absorb the high-frequency impact component of the impact energy with a large surface deformation at the initial contact stage, so that the outer surface of the nut obtains a soft initial contact response, avoiding impact dents or scratches on the nut surface. As the impact deepens, the impact force penetrates the flexible layer and is transmitted inward to the intermediate layer with medium hardness. The intermediate layer continues to absorb energy with elastic deformation while providing higher support stiffness than the flexible layer, preventing the flexible layer from being completely crushed and compacted under strong impact and losing its buffering function. The innermost hard layer has the highest hardness and is directly bonded and fixed to the rigid surface of the collision plate, playing a role in structural support and load uniformity. It evenly distributes the residual impact force, which has been gradually attenuated by the first two layers, to the collision plate substrate, avoiding long-term fatigue damage to the collision plate caused by local concentrated loads.

[0024] This makes the elastic buffer layer exhibit a resistance response characteristic that gradually increases from the outside to the inside throughout the entire collision process. Compared with a homogeneous buffer material layer with a single hardness, it avoids the problem of failure due to strong impact caused by the material being too soft overall, and also avoids the problem of insufficient buffering and elastic rebound caused by the material being too hard overall.

[0025] Optionally, it also includes a buffer mechanism, which includes a buffer discharge pipe and an active buffer. The buffer discharge pipe is vertically arranged and located below the receiving ring. The upper end of the buffer discharge pipe is connected to the receiving ring and communicates with the discharge port. The active buffer includes a coil controller and several electromagnetic coils coaxially sleeved on the outer wall of the buffer discharge pipe. The several electromagnetic coils are arranged sequentially at intervals along the axial direction of the buffer discharge pipe. The several electromagnetic coils are electrically connected to the coil controller.

[0026] By adopting the above technical solution, the buffer discharge pipe can guide the discharge of the nut. During the discharge process, the nut falls vertically within the buffer discharge pipe under the acceleration of gravity. At this time, the coil controller supplies current to each electromagnetic coil. After the electromagnetic coils are energized, an axially distributed magnetic field is generated inside the cavity of the buffer discharge pipe. As the nut, as a metallic conductor, falls within the buffer discharge pipe, it cuts the magnetic lines of force. According to the principle of electromagnetic induction, induced eddy currents are generated inside the nut conductor. These eddy currents are subjected to Ampere's force in the external magnetic field. According to Lenz's law, the direction of Ampere's force is always opposite to the direction of the nut's movement, thus generating an upward braking and decelerating force on the falling nut, gradually reducing its falling speed.

[0027] This braking method, based on the electromagnetic induction eddy current effect, is a non-contact deceleration. There is no mechanical contact between the electromagnetic coil and the nut, thus preventing any mechanical wear or contact scratches on the machined internal and external threads of the nut. Furthermore, the braking force can be actively controlled by adjusting the current amplitude of each electromagnetic coil through the coil controller. This allows for flexible matching of the appropriate deceleration force when machining nuts of different specifications and qualities, achieving precise control over the nut's falling speed.

[0028] Optionally, a valve plate mechanism is also included, the valve plate mechanism including a buffer plate, the buffer plate being disposed at the lower end of the buffer discharge pipe and the buffer plate closing the buffer discharge pipe, one end of the buffer plate being hinged to the buffer discharge pipe, and an elastic reset member being provided between the buffer plate and the buffer discharge pipe.

[0029] By adopting the above technical solution, a buffer plate is installed at the lower end of the buffer discharge pipe. Under normal conditions, the buffer plate is kept in a horizontal and closed state by the elastic force of the elastic reset component, thus blocking the lower outlet of the buffer discharge pipe.

[0030] When the nuts reach the lower end of the buffer discharge pipe, they first fall onto the buffer plate instead of continuing to fall freely. The buffer plate acts as a catch and support for the nuts. As subsequent nuts continue to arrive through the buffer discharge pipe and accumulate on the buffer plate one by one, the total weight of the nuts on the buffer plate continues to increase. When the torque generated by the total weight of the accumulated nuts on the hinge end of the buffer plate exceeds the reset torque of the elastic reset component, the buffer plate flips open around the hinge axis, and the accumulated nuts slide out of the buffer discharge pipe in batches.

[0031] After the nuts are released, the load on the buffer plate disappears, and the elastic force of the elastic reset component drives the buffer plate to automatically reset back to the closed state, waiting to receive the next batch of nuts and repeat the above accumulation and release process.

[0032] This design ensures that the lower outlet of the buffer discharge pipe is always in a closed state under normal conditions. Through the sealing and support of the buffer plate at the lower end of the buffer discharge pipe, the nuts are temporarily accumulated above the buffer plate. Only after a certain number have accumulated, the buffer plate flips and releases, and the nuts slide away from the buffer discharge pipe at a low speed and a short distance. This avoids the nuts from rushing out of the buffer discharge pipe at high speed in free fall and hitting the equipment or collection container below.

[0033] Optionally, one end of the buffer plate along its own length direction is hinged to the lower end of the buffer discharge pipe, a counterweight is provided on the buffer plate, the counterweight is slidably connected to the buffer plate along the length direction of the buffer plate, and a locking positioning element is provided between the counterweight and the buffer plate.

[0034] By adopting the above technical solution, a counterweight is set on the buffer plate. The counterweight slides on the buffer plate, making it easier to open when the counterweight slides away from the hinge end of the buffer plate, thus reducing the number of nuts required to open the buffer plate. Conversely, when the counterweight slides closer to the hinge end of the buffer plate, it is more difficult to open the buffer plate, thus increasing the number of nuts required to open the buffer plate.

[0035] Therefore, when processing nuts of different specifications, the weight of a single nut of different specifications varies. At this time, the position of the counterweight on the buffer plate can be adjusted to match the weight characteristics of the new specification nut, so that the buffer plate is triggered to release after accumulating a reasonable number of nuts. This can improve the convenience of switching and adjusting between multiple specifications of nuts and the adaptability of the production line.

[0036] In summary, this application includes at least one of the following beneficial technical effects: 1. Through the coordinated design of the automatic feeding mechanism, the pushing mechanism, the tapping seat, the machining tap, and the spindle, the machining tap always rotates continuously in the same direction during the batch processing of nuts, eliminating the need for reverse retraction. The processed nuts are automatically conveyed and discharged under the continuous pushing action of subsequent nuts, realizing continuous and uninterrupted processing of batch nuts, thereby improving the processing efficiency of large batch nuts.

[0037] 2. Through the coordinated design of buffer tiles, active buffers and valve plate mechanism, the nuts thrown from the main shaft undergo three-stage deceleration during the discharge process. The three-stage deceleration is connected sequentially throughout the entire path of the nut from being thrown out to being finally discharged, and the kinetic energy is gradually attenuated. This reduces the surface damage and loss of internal thread precision caused by collision during the collection process, thereby improving the output quality of the nuts.

[0038] 3. By adjusting the sliding position of the counterweight on the buffer plate and the amplitude of the electromagnetic coil current by the coil controller, the flipping release threshold and electromagnetic braking force of the buffer plate can be matched respectively when the processing equipment switches to process nuts of different specifications, which can improve the applicability of the processing equipment. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the overall structure of the internal thread continuous machining equipment of this application.

[0040] Figure 2 This is a cross-sectional structural schematic diagram of the internal thread continuous machining equipment of this application.

[0041] Figure 3 This is a cross-sectional structural diagram of the tapping seat, spindle, and machining tap of this application.

[0042] Figure 4 This is a schematic diagram of the overall structure of the internal thread continuous machining equipment of this application from another perspective.

[0043] Figure 5 This is an exploded structural diagram of the feeding mechanism, automatic feeding mechanism, tapping seat, and spindle of this application.

[0044] Figure 6 This is a schematic diagram of the overall structure of the internal thread continuous machining equipment of this application from another perspective.

[0045] Figure 7 This is a schematic diagram of the overall structure of the receiving mechanism, buffer mechanism, and valve plate mechanism of this application.

[0046] Figure 8 yes Figure 7 A magnified schematic diagram of part A in the middle.

[0047] Figure 9 This is a schematic diagram of the overall structure of the valve plate mechanism of this application.

[0048] In the diagram: 1. Frame; 2. Automatic feeding mechanism; 21. Hopper; 22. Agitator; 23. Feeding rack; 231. Discharge port; 232. Feeding track groove; 3. Pushing mechanism; 31. Push rod; 32. Linear actuator; 4. Tapping seat; 41. Anti-rotation hole; 5. Spindle; 51. Feeding through hole; 52. Through groove; 53. Sealing disc; 531. Part changing groove; 532. Cover plate; 533. Locking element; 6. Machining tap; 61. Tap section; 62. Polished rod section; 63. Bending section; 7. Rotary actuator; 8. Receiving machine. Structure; 81. Receiving ring; 811. Discharge port; 82. Sealing cover; 83. Buffer tile; 831. Mounting base plate; 832. Elastic buffer seat; 833. Collision plate; 834. Elastic buffer layer; 8341. Flexible layer; 8342. Intermediate layer; 8343. Hard layer; 9. Buffer mechanism; 91. Buffer discharge pipe; 92. Active buffer; 921. Electromagnetic coil; 10. Valve plate mechanism; 101. Buffer plate; 102. Elastic reset component; 103. Counterweight; 104. Locking and positioning component; 20. Collection frame. Detailed Implementation

[0049] The following is in conjunction with the appendix Figure 1 -Appendix Figure 9 This application will be described in further detail below.

[0050] A continuous machining equipment for internal threads of nuts, as described in the reference. Figure 1 and Figure 2 It includes a frame 1, an automatic feeding mechanism 2, a pushing mechanism 3, a tapping seat 4, a spindle 5, and a machining tap 6.

[0051] Reference Figure 2 and Figure 3 The spindle 5 is rotatably mounted on the frame 1. A rotary driver 7 is mounted on the frame 1, which is connected to the spindle 5 and drives its rotation. A coaxial through-hole 51 is provided on the spindle 5. A through-groove 52 is provided at one end of the spindle 5, its length direction being radially aligned with the spindle 5. One end of the through-groove 52 communicates with the through-hole 51 along its length, and the other end passes through the spindle 5. The machining tap 6 includes a smooth section 62, which is coaxially mounted within the through-hole 51. One end of the smooth section 62 is coaxially fixedly connected to the tap section 61, and the other end is bent to form a bent section 63. The tap section 61 is located outside the spindle 5, and the bent section 63 is located within the through-groove 52, with its length direction aligned with the length direction of the through-groove 52.

[0052] Reference Figure 2 and Figure 3A tapping seat 4 is mounted on the frame 1, and an anti-rotation hole 41 is provided on the tapping seat 4. The tap section 61 is located inside the anti-rotation hole 41. An automatic feeding mechanism 2 is mounted on the frame 1, and the automatic feeding mechanism 2 has a discharge port 231, which is directly opposite and connected to the anti-rotation hole 41. A pushing mechanism 3 is mounted on the frame 1, and the pushing mechanism 3 is directly opposite the discharge port 231.

[0053] Under this structural design, the rotary driver 7 drives the spindle 5 to rotate. Since the bent section 63 is located in the through groove 52, when the through groove 52 rotates with the spindle 5, its groove wall generates a circumferential driving force on the bent section 63, thereby driving the machining tap 6 to rotate synchronously with the spindle 5.

[0054] After the nut is conveyed to the discharge port 231 by the automatic feeding mechanism 2, it is pushed into the anti-rotation hole 41 by the pushing mechanism 3. As the pushing mechanism 3 pushes the nut to move towards the tap section 61 in the anti-rotation hole 41, the nut is constrained and cannot rotate in the anti-rotation hole 41. Therefore, the rotating tap section 61 cuts internal threads on the inner wall of the nut until the nut passes the tap section 61, is fitted onto the smooth rod section 62, and enters the conveying through hole 51.

[0055] When machining the internal threads of a batch of nuts, the new nuts pushed in after completing their own tapping and entering the feed hole 51 exert an axial thrust on the nuts that have been previously machined and remain on the smooth rod section 62, causing the previous nuts to move continuously along the smooth rod section 62 toward the bending section 63.

[0056] When the nut reaches the connection between the smooth section 62 and the bent section 63, the nut will move to the bent section 63. At this time, under the centrifugal force generated by the rotation of the main shaft 5, the nut will continue to move along the bent section 63, and then disengage from the bent section 63 through the through groove 52 and be thrown out.

[0057] Therefore, during the machining process, the machining tap 6 always rotates continuously in the same direction, without the need for reverse retraction. The machined nuts are automatically conveyed and discharged under the continuous pushing action of subsequent nuts, realizing continuous and uninterrupted machining of internal threads of nuts in batches.

[0058] Reference Figure 2 and Figure 4 The feeding mechanism 3 includes a push rod 31 and a linear driver 32. The linear driver 32 is connected to the frame 1 and is also connected to the push rod 31. The linear driver 32 is either a linear cylinder or a linear motor.

[0059] Reference Figure 3 and Figure 4 The push rod 31 and the tap section 61 are coaxially opposite each other. The end of the push rod 31 facing the tap section 61 is coaxially provided with a clearance hole. The inner diameter of the clearance hole is larger than the outer diameter of the tap section 61, and the outer diameter of the push rod 31 is smaller than the inner circle diameter of the anti-rotation hole 41.

[0060] Based on the above structural design of the pusher mechanism 3, when the nut reaches the discharge port 231, the linear actuator 32 drives the push rod 31 to extend. One end of the push rod 31 contacts the nut and pushes the nut to move along the anti-rotation hole 41. As the push rod 31 pushes the nut to gradually fit into the tap section 61, the tap section 61 can extend into the clearance hole. At this time, the push rod 31 can continue to push the nut until the nut completely passes the tap section 61. When the nut completely passes the tap section 61 and is fitted onto the smooth rod section 62 and enters the feed through hole 51, the linear actuator 32 drives the push rod 31 to retract back to its original position. At this time, the next nut reaches the discharge port 231 position under the continuous feeding of the automatic feeding mechanism 2. The linear actuator 32 drives the push rod 31 to extend again to start the next tapping cycle.

[0061] Reference Figure 2 and Figure 4 The automatic feeding mechanism 2 includes a hopper 21, a mixer 22, and a feeding frame 23. The hopper 21 is vertically arranged and located above the frame 1. The mixer 22 is located inside the hopper 21. A discharge port is provided at the bottom of the hopper 21. The feeding frame 23 is vertically arranged, with its upper end connected to the hopper 21 and its lower end connected to the frame 1. A discharge port 231 is provided on the feeding frame 23. A feeding track groove 232 is provided on the feeding frame 23. The upper end of the feeding track groove 232 extends to communicate with the discharge port of the hopper 21, and the lower end extends to communicate with the discharge port 231.

[0062] In this embodiment, refer to Figure 2 and Figure 4 The agitator 22 includes an agitator rod rotatably disposed in the hopper 21, and an agitator motor that is drivenly connected to the agitator rod. The agitator motor is disposed on the frame 1.

[0063] Based on the design of the automatic feeding mechanism 2, the continuous stirring of the stirring rod keeps the nuts in the hopper 21 in a loose and flowing state. Under the combined drive of the stirring action and their own gravity, the nuts fall one by one from the discharge port into the feeding track groove 232, and slide down sequentially along the feeding track groove 232 under the action of gravity to the discharge port 231, waiting for the pushing mechanism 3 to push them into the anti-rotation hole 41 for tapping.

[0064] Reference Figure 2 and Figure 3 The tapping seat 4 is fixed on the frame 1, and the end of the tap section 61 that is away from the polished rod section 62 along its own axis is coaxially located in the anti-rotation hole 41.

[0065] Reference Figure 3 and Figure 5 The cross-sectional profile of the anti-rotation hole 41 is adapted to the outer profile of the nut, and the axial length of the anti-rotation hole 41 is greater than the axial length of the tap section 61.

[0066] With the structural design of the tapping seat 4, the nut is constrained within the anti-rotation hole 41, preventing it from rotating with the tap section 61. This allows the nut to move only along the tap section 61 to ensure the machining of the nut's internal thread.

[0067] Reference Figure 2 and Figure 5 The main spindle 5 is rotatably connected to the frame 1 via bearings, and the axial direction of the main spindle 5 is horizontal. The rotary drive 7 is installed inside the frame 1.

[0068] In this embodiment, refer to Figure 2 and Figure 3 The rotary driver 7 uses a three-phase asynchronous motor. The rotary driver 7 is installed inside the frame 1. The output shaft of the rotary driver 7 and the outer side of the main shaft 5 are coaxially connected to synchronous pulleys. The synchronous belt tension sleeve is set on the outer side of the two synchronous pulleys, which makes the rotary driver 7 and the main shaft 5 form a synchronous belt drive. The rotational power of the rotary driver 7 can be transmitted to the main shaft 5, driving the main shaft 5 to rotate continuously in the same direction around its own axis at a set speed.

[0069] Reference Figure 3 and Figure 5 On the main spindle 5, the cross-section of the conveying through hole 51 is circular, and its inner diameter is larger than the outer diameter of the nut to be processed, allowing the nut to move freely along the axial direction of the main spindle 5 within the conveying through hole 51 without jamming. The width of the through groove 52 is adapted to the outer diameter of the nut, allowing the nut to move along the length of the through groove 52 from the bent section 63 to detach from the main spindle 5. The depth of the through groove 52 along the axial direction of the main spindle 5 is greater than the nut's own axial dimension along the main spindle 5 when it is fitted onto the bent section 63, thus ensuring that the nut can pass through the through groove 52.

[0070] Reference Figure 3 The tap section 61, the smooth rod section 62, and the bending section 63 are integrally formed, making the machining tap 6 a continuous rod shape formed in one piece.

[0071] Specifically, the smooth rod section 62 is a cylindrical, smooth rod with an outer diameter smaller than the inner diameter of the nut, allowing the tapped nut to fit onto the smooth rod section 62 and slide freely along its axial direction. The tap section 61 is the cutting part of the machining tap 6, with a standard thread profile machined on its outer surface to machine the internal thread of the nut. The bending angle between the bent section 63 and the smooth rod section 62 is ninety degrees, and the transition between them is an arc. This allows the nut to be pushed along the smooth rod section 62 onto the bent section 63, and then, under centrifugal force, the nut located on the bent section 63 can slide along the bent section 63 through the through groove 52 and then be thrown out of the through groove 52. After the machining tap 6 is installed in the spindle 5, the groove wall of the through groove 52 forms a radial constraint on the bent section 63 along the circumference of the spindle 5, thereby allowing the machining tap 6 to be driven by the spindle 5.

[0072] Reference Figure 3 and Figure 5 A sealing disc 53 is provided at one end of the main spindle 5. The sealing disc 53 is located at the end of the main spindle 5 where a through groove 52 is opened, and the sealing disc 53 is detachably connected to the main spindle 5. The sealing disc 53 is connected to the main spindle 5 by several bolts, which pass through the sealing disc 53 and are screwed into the threaded holes on the end face of the main spindle 5.

[0073] The sealing disc 53 covers and seals the open area of ​​the end face where the through groove 52 is located. On the one hand, the sealing disc 53 forms an axial limit on the bent section 63 along the axis of the main shaft 5 to prevent the machining tap 6 from axially moving or detaching from the main shaft 5 during operation. On the other hand, the sealing disc 53 can prevent foreign objects from entering the interior of the main shaft 5 through the through groove 52 and the conveying hole 51, ensuring the cleanliness of the interior of the main shaft 5.

[0074] Reference Figure 3 and Figure 5 A parts-changing groove 531 is provided on the sealing disc 53. The length direction of the parts-changing groove 531 is set along the length direction of the through groove 52. The parts-changing groove 531 passes through the sealing disc 53 along the axial direction of the main shaft 5. The parts-transfer through hole 51 and the through groove 52 are both connected to the parts-changing groove 531. The width of the parts-changing groove 531 is greater than the width of the through groove 52. A cover plate 532 is inserted into the parts-changing groove 531 to close the parts-changing groove 531. The length direction of the cover plate 532 is set along the length direction of the parts-changing groove 531. One end of the cover plate 532 is rotatably connected to the sealing disc 53, and a locking element 533 is provided between the other end of the cover plate and the sealing disc 53.

[0075] Based on the design of the replacement slot 531 and cover plate 532, when the machining tap 6 needs to be replaced due to wear, the locking member 533 releases the lock on the cover plate 532. At this time, the cover plate 532 can be rotated open, thereby opening the replacement slot 531, allowing the machining tap 6 to be removed from the spindle 5 for replacement. After replacing the machining tap 6, the new machining tap 6 is reinserted into the spindle 5 and positioned. Then, the cover plate 532 is rotated back to its original position and re-locked by the locking member 533. This design allows the replacement of the machining tap 6 to be completed without disassembling the sealing plate 53, thus shortening the downtime caused by tap replacement.

[0076] In this embodiment, refer to Figure 5 The locking element 533 can be a hand-tightening bolt. The hand-tightening bolt passes through the cover plate 532 and is screwed into the corresponding threaded hole on the corresponding end face of the spindle 5. When the hand-tightening bolt is tightened, the cover plate 532 is locked. When the hand-tightening bolt is loosened and pulled out, the cover plate 532 can be freely flipped open.

[0077] Reference Figure 2 and Figure 6The processing equipment also includes a receiving mechanism 8, which includes a receiving ring 81. The receiving ring 81 is fixedly connected to the frame 1. A sealing cover 82 is provided at one end of the receiving ring 81 away from the frame 1 along its own axis. The sealing cover 82 is detachably connected to the receiving ring 81 and closes the receiving ring 81.

[0078] Reference Figure 3 and Figure 6 The receiving ring 81 is coaxially sleeved on the outside of the main shaft 5, and the receiving ring 81 is spaced apart from the main shaft 5, and the bent section 63 is located inside the receiving ring 81.

[0079] Reference Figure 3 and Figure 7 The receiving ring 81 has a discharge port 811 that runs through it, and the discharge port 811 is located below the main shaft 5 in the vertical direction.

[0080] Based on the design of the receiving mechanism 8, the nut thrown out from the main shaft 5 is blocked by the inner wall of the receiving ring 81 and confined inside the receiving ring 81. The sealing cover 82 prevents the nut from flying out from the end face of the receiving ring 81. The nut that is blocked naturally slides down to the discharge port 811 under its own gravity and is discharged from the receiving ring 81.

[0081] In this embodiment, refer to Figure 6 and Figure 7 One side of the sealing cover 82 is rotatably connected to the receiving ring 81, and the other side is provided with a sealing bolt. One end of the sealing bolt passes through the sealing cover 82 and is screwed to the receiving ring 81.

[0082] Reference Figure 7 The inner wall of the receiving ring 81 is provided with several buffer tiles 83, which are arranged sequentially along the circumference of the receiving ring 81.

[0083] Reference Figure 7 and Figure 8 The buffer tile 83 includes a mounting base plate 831 and a collision plate 833. The mounting base plate 831 is fixed on the inner wall of the receiving ring 81. The collision plate 833 is located on the side of the mounting base plate 831 away from the receiving ring 81, and the collision plate 833 and the mounting base plate 831 are arranged parallel to each other at intervals. An elastic buffer seat 832 is provided between the collision plate 833 and the mounting base plate 831, and an elastic buffer layer 834 is provided on the side of the collision plate 833 away from the elastic buffer seat 832. The elastic buffer layer 834, the collision plate 833, the elastic buffer seat 832, the mounting base plate 831 and the receiving ring 81 are connected in sequence.

[0084] Based on the structural design of the buffer tile 83, during the process of the thrown nut impacting the receiving ring 81, the nut will first hit the collision plate 833 of the corresponding buffer tile 83. Under the flexible support of the elastic buffer seat 832, the collision plate 833 can generate elastic displacement towards the mounting base plate 831. The elastic buffer seat 832 continuously absorbs the kinetic energy of the nut during the compression stroke, transforming the originally instantaneous high-speed rigid collision into a gradual elastic deceleration process with a certain stroke, effectively extending the collision action time and reducing the peak impact force during the collision process.

[0085] At the same time, the elastic buffer layer 834 provides flexible deformation buffering at the initial moment of contact between the nut and the collision plate 833, avoiding local stress concentration and surface damage caused by direct hard contact between the outer surface of the nut and the rigid surface of the collision plate 833.

[0086] Thus, the elastic buffer layer 834 and the elastic buffer seat 832 form a series of two-stage buffer energy absorption structures during the collision process: the first stage is the surface deformation energy absorption provided by the elastic buffer layer 834, which mitigates the contact stress on the nut surface through local material deformation in the initial contact stage; the second stage is the overall compression stroke energy absorption provided by the elastic buffer seat 832, which consumes the remaining kinetic energy of the nut through elastic compression deformation in the deeper collision stage.

[0087] In this embodiment, refer to Figure 7 Several buffer tiles 83 are evenly distributed around the circumference of the receiving ring 81. The circumferential gap between two adjacent buffer tiles 83 is smaller than the outer diameter of the nut, so that no matter what circumferential angle the nut is thrown out from, it will hit at least one buffer tile 83 instead of directly hitting the metal inner wall of the receiving ring 81.

[0088] In this embodiment, refer to Figure 8 The mounting base plate 831 is bonded to the inner wall of the receiving ring 81. The elastic buffer seat 832 consists of several rubber blocks distributed between the collision plate 833 and the mounting base plate 831. One end of each rubber block is bonded to the collision plate 833 with adhesive, and the other end is bonded to the mounting base plate 831 with adhesive. The rubber blocks have a Shore hardness of 40A to 60A, providing both sufficient elastic deformation and load-bearing capacity.

[0089] In this embodiment, refer to Figure 8The elastic buffer layer 834 comprises a flexible layer 8341, an intermediate layer 8342, and a rigid layer 8343 stacked sequentially. The rigid layer 8343 is bonded to the impact plate 833, and the hardness of the flexible layer 8341, intermediate layer 8342, and rigid layer 8343 increases sequentially. Specifically, the flexible layer 8341 is made of silicone material with a Shore hardness of 20A to 30A and a thickness of 2 mm; the intermediate layer 8342 is made of polyurethane material with a Shore hardness of 60A to 80A and a thickness of 1.5 mm; and the rigid layer 8343 is made of nylon material with a Shore hardness of 70D to 80D and a thickness of 1 mm. The flexible layer 8341, intermediate layer 8342, and rigid layer 8343 are all bonded together using adhesive.

[0090] Based on the structural design of the elastic buffer layer 834, when the nut impacts the elastic buffer layer 834, the nut first contacts the flexible layer 8341. The flexible layer 8341 has the lowest hardness and the strongest elastic deformation capacity, which can cover the impact contact area of ​​the nut with a large surface deformation at the initial contact stage and absorb the high-frequency impact component of the impact energy, avoiding impact dents or scratches on the nut surface. As the impact deepens, the impact force penetrates the flexible layer 8341 and is transmitted inward to the intermediate layer 8342 with moderate hardness. The intermediate layer 8342 continues to absorb energy with elastic deformation while providing higher support stiffness than the flexible layer 8341, preventing the flexible layer 8341 from being completely crushed and compacted under strong impact, thus losing its buffering function. The hard layer 8343 has the highest hardness and plays a role in structural support and load uniformity, evenly distributing the residual impact force after gradual attenuation by the first two layers to the collision plate 833 matrix, avoiding long-term fatigue damage to the collision plate 833 caused by localized concentrated loads.

[0091] Reference Figure 6 and Figure 7 The processing equipment also includes a buffer mechanism 9, which includes a buffer discharge pipe 91 and an active buffer 92. The buffer discharge pipe 91 is vertically arranged below the receiving ring 81, and its upper end is connected to the receiving ring 81 and communicates with the discharge port 811. The active buffer 92 includes a coil controller and several electromagnetic coils 921. The electromagnetic coils 921 are coaxially sleeved on the outside of the buffer discharge pipe 91, and the several electromagnetic coils 921 are arranged sequentially at intervals along the axial direction of the buffer discharge pipe 91. All of the electromagnetic coils 921 are electrically connected to the coil controller.

[0092] The buffer discharge tube 91 is made of a non-magnetic material, such as stainless steel or engineering plastic, to ensure that the magnetic field generated by the electromagnetic coil 921 can penetrate the tube wall and enter the cavity to act on the nut. The cavity size of the buffer discharge tube 91 is larger than the size of the nut, thus leaving a sufficient gap between the nut and the tube wall. This gap ensures that even if the nut experiences slight displacement due to force during its descent, it will not come into contact with the tube wall of the buffer discharge tube 91, thereby avoiding wear or scratches on the machined outer surface and internal thread of the nut. Four electromagnetic coils 921 are provided, each consisting of enameled copper wire tightly wound on a ring frame. The ring frame is coaxially fitted onto the outer side of the buffer discharge tube 91 and fixed to the outer wall of the buffer discharge tube 91 with screws.

[0093] Based on the design of the active buffer 92, after the nut enters the buffer discharge pipe 91 from the discharge port 811, it falls vertically within the buffer discharge pipe 91 under the acceleration of gravity. At this time, the coil controller supplies current to each electromagnetic coil 921. After the electromagnetic coils 921 are energized, an axially distributed magnetic field is generated inside the buffer discharge pipe 91. As a metallic conductor, the nut cuts the magnetic lines of force during its falling motion. According to the principle of electromagnetic induction, induced eddy currents are generated inside the nut conductor. These eddy currents are subjected to Ampere force in the external magnetic field. According to Lenz's law, the direction of the Ampere force is always opposite to the direction of the nut's movement. This generates an upward braking and decelerating force on the falling nut, gradually reducing its falling speed.

[0094] This braking method based on the electromagnetic induction eddy current effect is a non-contact deceleration method. There is no mechanical contact between the electromagnetic coil 921 and the nut, so it will not cause any mechanical wear or contact scratches to the machined internal thread surface and external surface of the nut.

[0095] It should be noted that the nut is typically made of metals such as carbon steel, alloy steel, or stainless steel. These metals, as conductors, will induce eddy currents within the nut when passing through the magnetic field region generated by the electromagnetic coil 921, due to cutting magnetic lines of force. The Ampere force experienced by these eddy currents in the external magnetic field acts as a braking and decelerating force on the nut. For nuts made of ferromagnetic materials such as carbon steel and alloy steel, in addition to the aforementioned eddy current braking effect, the ferromagnetic material will also be magnetized in the external magnetic field. The magnetized nut will then generate a magnetic attraction between itself and the electromagnetic coil 921. Because the size of the buffer discharge tube 91 is significantly larger than the size of the nut, there is a sufficient gap between the tube wall and the nut. Furthermore, several electromagnetic coils 921 are coaxially arranged around the outside of the buffer discharge tube 91, resulting in an axially symmetrical magnetic field distribution along the circumference. The magnetic attraction forces experienced by the ferromagnetic nut at the center of the tube cancel each other out. Therefore, the nut will not be pulled to one side of the tube wall by the magnetic attraction force during normal descent, thus preventing jamming. For nuts made of weakly magnetic or non-ferromagnetic materials such as stainless steel (e.g., austenitic stainless steel SUS304), the above-mentioned magnetic attraction effect can be ignored. In this case, electromagnetic braking mainly relies on the eddy current effect to achieve deceleration.

[0096] In practical applications, the conductivity and permeability of nuts made of different materials vary, and these differences directly affect the magnitude of eddy current braking force. Therefore, when machining nuts of different materials, the amplitude of the energizing current of each electromagnetic coil 921 can be adjusted by the coil controller to match the braking force required for the corresponding nut material. For example, when machining stainless steel nuts with low conductivity or permeability, the energizing current of the electromagnetic coil 921 can be appropriately increased to enhance the magnetic field strength, thereby compensating for insufficient eddy current braking force due to material properties. When machining carbon steel nuts with both high conductivity and permeability, the energizing current of the electromagnetic coil 921 can be appropriately reduced to avoid excessive braking force causing the nut to fall too slowly or even stop in the tube. In addition, the installation spacing of several electromagnetic coils 921 in the axial direction of the buffer discharge tube 91 can be adjusted according to the specifications and material characteristics of the nuts being machined, so that the magnetic field coverage of each electromagnetic coil 921 matches the decreasing speed of the nut, achieving a more uniform and stable deceleration process.

[0097] Because several electromagnetic coils 921 are coaxially arranged on the outside of the buffer discharge tube 91, the magnetic field they generate inside the buffer discharge tube 91 is axially symmetrically distributed along the circumference. The magnetic force experienced by the nut at the center position inside the buffer discharge tube 91 cancels each other out in all directions and tends to be in equilibrium. At the same time, the cavity size of the buffer discharge tube 91 is larger than the size of the nut and leaves sufficient clearance, so even if there is a slight offset, the nut will not come into contact with the tube wall of the buffer discharge tube 91.

[0098] Furthermore, the braking force can be actively controlled by adjusting the current amplitude of each electromagnetic coil 921 through the coil controller. When machining larger, heavier nuts, the current can be increased to provide a stronger electromagnetic braking force; when machining smaller, lighter nuts, the current can be reduced to avoid excessive braking force that could cause the nut to stop inside the tube.

[0099] Reference Figure 7 and Figure 9 The processing equipment also includes a valve plate mechanism 10, which includes a buffer plate 101. The buffer plate 101 is disposed at the lower end of the buffer discharge pipe 91 and closes the lower outlet of the buffer discharge pipe 91. One end of the buffer plate 101 along its own length direction is hinged to the lower end of the buffer discharge pipe 91, and an elastic reset member 102 is provided between the buffer plate 101 and the buffer discharge pipe 91.

[0100] Among them, the elastic reset component 102 adopts a torsion spring. The torsion spring is sleeved on the hinge shaft between the buffer plate 101 and the buffer discharge pipe 91. One end of the torsion spring abuts against the buffer plate 101, and the other end abuts against the spring seat on the outer wall of the buffer discharge pipe 91. The preload of the torsion spring keeps the buffer plate 101 horizontally set when there is no external load to close the buffer discharge pipe 91.

[0101] Based on the design of the valve plate mechanism 10, the buffer plate 101 is kept horizontally closed under normal conditions by the elastic force of the elastic reset member 102, blocking the lower outlet of the buffer discharge pipe 91. When the nut reaches the lower end of the buffer discharge pipe 91 after being decelerated by the electromagnetic coil 921, it first falls on the upper surface of the buffer plate 101, where the buffer plate 101 acts as a support and catch. As subsequent nuts continue to arrive and accumulate on the buffer plate 101, the total weight of the nuts on the buffer plate 101 continues to increase. When the total weight of the accumulated nuts generates a flipping torque on the hinge axis that exceeds the reset torque provided by the elastic reset member 102, the buffer plate 101 flips downward around the hinge axis and opens. Under the action of gravity, the accumulated nuts slide down the buffer plate 101 in batches and leave the buffer discharge pipe 91 at a low speed.

[0102] After the nuts are released, the load on the buffer plate 101 disappears, and the elastic force of the elastic reset member 102 drives the buffer plate 101 to automatically reset to the horizontal closed state, re-sealing the lower outlet of the buffer discharge pipe 91, waiting to receive the next batch of nuts and repeating the above accumulation and release process. This design allows the nuts to be temporarily accumulated in the cavity above the buffer plate 101, and only after a certain number have been accumulated will the buffer plate 101 flip and release, and the nuts will leave the buffer discharge pipe 91 by sliding away at a low speed and a short distance, thus avoiding the nuts from rushing out of the buffer discharge pipe 91 directly in a high-speed state of free fall.

[0103] Reference Figure 9A counterweight 103 is provided on the buffer plate 101. The counterweight 103 is located on the lower side of the buffer plate 101. The counterweight 103 is slidably connected to the buffer plate 101 along the length direction of the buffer plate 101, and a locking positioning member 104 is provided between the counterweight 103 and the buffer plate 101.

[0104] In this embodiment, a sliding guide groove with a T-shaped cross-section is formed on the lower surface of the buffer plate 101 along its length. A T-shaped slider that mates with the T-shaped guide groove is provided at the bottom of the counterweight 103. The T-shaped slider is inserted into the T-shaped guide groove and slides in contact with it. The T-shaped cross-section allows the counterweight 103 to slide along the buffer plate 101 without detaching from it. The locking and positioning member 104 is a bolt. The bolt is screwed to the counterweight 103, and one end of the bolt passes through the counterweight 103 and abuts against the groove wall of the T-shaped guide groove. When the bolt is tightened, the counterweight 103 is locked in its current position by friction. When the bolt is loosened, the counterweight 103 can slide freely.

[0105] Based on the design of the counterweight 103, its position affects the threshold for the buffer plate 101 to flip and release. When the counterweight 103 slides away from the hinge axis, i.e., towards the free end of the buffer plate 101, the torque generated by the counterweight 103's own weight on the hinge axis increases. This torque is in the same direction as the torque generated by the accumulated weight of the nuts and is opposite to the reset torque of the elastic reset member 102. Therefore, the buffer plate 101 is easier to flip open, and the number of nuts required to open the buffer plate 101 is reduced. Conversely, when the counterweight 103 slides closer to the hinge axis, the torque generated by the counterweight 103's own weight on the hinge axis decreases, and the reset torque of the elastic reset member 102 relatively increases. The buffer plate 101 is more difficult to flip open by the weight of the nuts, and the number of nuts required to open the buffer plate 101 is increased.

[0106] Therefore, when processing nuts of different specifications, the individual weights of the nuts vary. For example, when switching from a larger nut to a smaller nut, because the smaller nut is lighter, if the position of the counterweight 103 remains unchanged, a larger number of nuts need to be accumulated to reach the flipping threshold, which may lead to excessive accumulation inside the tube. In this case, the counterweight 103 can be slid towards the free end of the buffer plate 101 to lower the flipping threshold, so that the buffer plate 101 triggers release after accumulating a reasonable number of nuts. Conversely, when switching to a larger nut, the counterweight 103 can be slid towards the hinge axis to increase the flipping threshold, preventing frequent triggering of release with a small number of nuts. By loosening the locking positioning component 104 to adjust the position of the counterweight 103 and then relocking it, the convenience of switching and adjusting between multiple nut specifications and the adaptability of the production line can be improved.

[0107] Reference Figure 6A collection frame 20 is provided below the buffer discharge pipe 91. The collection frame 20 is placed on the frame 1, and the lower end of the buffer discharge pipe 91 extends into the collection frame 20.

[0108] The implementation principle of this application embodiment is as follows: When continuously machining the internal thread of the nut, the rotary driver 7 is first started. The rotary driver 7 drives the spindle 5 to rotate continuously in the same direction at a set speed. The groove wall of the through groove 52 generates a circumferential driving force on the bent section 63. The machining tap 6 rotates synchronously with the spindle 5, and the tap section 61 rotates continuously in the anti-rotation hole 41. At the same time, the agitator 22 is started. The agitator 22 continuously agitates in the hopper 21. Under the combined drive of the agitation and its own gravity, the nuts fall one by one from the discharge port into the feeding track groove 232, and slide down the feeding track groove 232 in an orderly manner to the discharge port 231 to wait.

[0109] When the first nut to be processed reaches the discharge port 231, the linear actuator 32 drives the push rod 31 to extend towards the tap section 61. The push rod 31 pushes the nut to move axially along the anti-rotation hole 41, while the rotating tap section 61 processes the internal thread of the nut until the push rod 31 continues to push the nut until the nut completely passes the tap section 61. After the nut has completely passed the tap section 61, the processing of all the internal threads of the nut is completed, and the nut is fitted onto the smooth rod section 62 and enters the conveyor through hole 51. Subsequently, the linear actuator 32 drives the push rod 31 to retract to the initial position.

[0110] After push rod 31 retracts, the next nut to be processed automatically replenishes the feed track groove 232 to the outlet 231 position under its own gravity. Linear actuator 32 drives push rod 31 to extend again, and push rod 31 pushes the second nut into the anti-rotation hole 41 for tapping. After the second nut completes tapping and enters the feed through hole 51, it generates an axial thrust on the first nut that was previously stopped on the smooth rod section 62, causing the first nut to move further along the smooth rod section 62 towards the bending section 63. This cycle repeats, and each subsequent new nut that completes tapping and enters the feed through hole 51 generates an axial thrust on the nuts that have been processed in front, causing the several processed nuts strung together on the smooth rod section 62 to continuously advance towards the bending section 63.

[0111] When the first nut to be processed reaches the bend where the smooth section 62 connects to the bent section 63, under the continuous thrust of the subsequent nuts and the guiding effect of the arc transition between the bent section 63 and the smooth section 62, the nut moves past the bend and onto the bent section 63. At this time, under the centrifugal force generated by the high-speed rotation of the main shaft 5, the nut moves along the bent section 63, causing the nut to pass through the through groove 52, detach from the bent section 63, and then be thrown out of the main shaft 5.

[0112] The ejected nut enters the internal space of the receiving ring 81 and impacts the surface of the elastic buffer layer 834 of the buffer tile 83. Under the flexible support of the elastic buffer seat 832, the impact plate 833 undergoes elastic displacement towards the mounting base plate 831, thereby attenuating the nut's momentum and significantly reducing its movement speed. The nut, having lost horizontal kinetic energy within the receiving ring 81, falls to the discharge port 811 under gravity and enters the buffer discharge pipe 91 through the discharge port 811.

[0113] After entering the buffer discharge pipe 91, the nut accelerates vertically downwards under the influence of gravity. As the falling nut passes through the magnetic field region generated by the electromagnetic coil 921, induced eddy currents are generated inside the nut. These eddy currents are subjected to an Ampere force opposite to the direction of motion in the external magnetic field, generating an upward electromagnetic braking force on the nut, gradually reducing its falling speed. After being decelerated sequentially by the four electromagnetic coils 921, the nut reaches the lower end of the buffer discharge pipe 91 at a lower speed and lands on the buffer plate 101.

[0114] The buffer plate 101 remains horizontally closed under the elastic force of the elastic reset member 102 to receive the nuts. As subsequent nuts continue to arrive and accumulate on the buffer plate 101, the total weight of the nuts above the buffer plate 101 gradually increases. When the combined overturning torque of the accumulated total weight of the nuts and the weight of the counterweight 103 on the buffer plate 101 exceeds the reset torque of the elastic reset member 102, the buffer plate 101 flips downward around the hinge axis and opens, and the accumulated batch of nuts slides slowly along the inclined surface of the buffer plate 101 into the collection frame 20 below. After the nuts are released, the elastic reset member 102 drives the buffer plate 101 to automatically reset and close, waiting for the next batch of nuts to accumulate.

[0115] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be included within the scope of protection of this application.

Claims

1. A continuous machining equipment for internal threads of nuts, characterized in that, include: A frame (1) is provided with a tapping seat (4), an automatic feeding mechanism (2) and a pushing mechanism (3). The tapping seat (4) has an anti-rotation hole (41). The automatic feeding mechanism (2) has a discharge port (231). The discharge port (231) is directly connected to the anti-rotation hole (41). The automatic feeding mechanism (2) is used to automatically feed nuts to the discharge port (231). The pushing mechanism (3) is used to push the nuts in the discharge port (231) into the anti-rotation hole (41). A main shaft (5) is rotatably mounted on the frame (1). A rotary driver (7) is mounted on the frame (1) and is connected to the main shaft (5) in a transmission connection. A conveying through hole (51) is coaxially opened on the main shaft (5). A through groove (52) is opened at one end of the main shaft (5). One end of the through groove (52) is connected to the conveying through hole (51) along its own length direction, and the other end passes through the main shaft (5) radially. The machining tap (6) includes a smooth rod section (62), which is coaxially arranged in the conveying through hole (51). One end of the smooth rod section (62) is coaxially fixedly connected to the tap section (61), and the other end is bent to form a bent section (63). The bent section (63) is located in the through groove (52), and the length direction of the bent section (63) is arranged along the length direction of the through groove (52). The tap section (61) is coaxially arranged in the anti-rotation hole (41).

2. The continuous machining equipment for internal threads of nuts according to claim 1, characterized in that, The main shaft (5) has a sealing disc (53) coaxially arranged at one end where the through groove (52) is opened. The sealing disc (53) is detachably connected to the main shaft (5).

3. The continuous machining equipment for internal threads of nuts according to claim 2, characterized in that, The sealing disc (53) is provided with a replacement groove (531), the length direction of the replacement groove (531) is arranged along the length direction of the through groove (52), the replacement groove (531) passes through the sealing disc (53) along the axial direction of the main shaft (5), and the conveying through hole (51) and the through groove (52) are both connected to the replacement groove (531); A cover plate (532) is inserted into the replacement slot (531). The cover plate (532) closes the replacement slot (531). The length of the cover plate (532) is arranged along the length of the replacement slot (531). One end of the cover plate (532) is rotatably connected to the sealing disc (53), and the other end is provided with a locking element (533) between it and the main shaft (5).

4. The continuous machining equipment for internal threads of nuts according to claim 1, characterized in that, It also includes a receiving mechanism (8), which includes a receiving ring (81). The receiving ring (81) is fixedly connected to the frame (1). The receiving ring (81) is coaxially sleeved on the outside of the main shaft (5), and the receiving ring (81) is spaced apart from the main shaft (5). The bent section (63) is located inside the receiving ring (81). A discharge port (811) is provided through the receiving ring (81), and the discharge port (811) is located below the main shaft (5) in the vertical direction. The receiving ring (81) is detachably connected to a sealing cap (82) at one end of its axis away from the frame (1), and the sealing cap (82) closes the receiving ring (81).

5. The continuous machining equipment for internal threads of nuts according to claim 4, characterized in that, The inner wall of the receiving ring (81) is provided with a plurality of buffer tiles (83), and the plurality of buffer tiles (83) are arranged sequentially along the circumference of the receiving ring (81).

6. The continuous machining equipment for internal threads of nuts according to claim 5, characterized in that, The buffer tile (83) includes a mounting base plate (831) and a collision plate (833). The mounting base plate (831) is fixed on the inner wall of the receiving ring (81). The collision plate (833) is located on the side of the mounting base plate (831) facing the main shaft (5), and the collision plate (833) is arranged parallel to the mounting base plate (831). An elastic buffer seat (832) is provided between the collision plate (833) and the mounting base plate (831), and an elastic buffer layer (834) is provided on the side of the collision plate (833) away from the elastic buffer seat (832).

7. A continuous machining equipment for internal threads of nuts according to claim 6, characterized in that, The elastic buffer layer (834) includes a flexible layer (8341), an intermediate layer (8342) and a hard layer (8343) stacked in sequence. The hard layer (8343) is bonded to the collision plate (833), and the hardness of the flexible layer (8341), the intermediate layer (8342) and the hard layer (8343) increases in sequence.

8. The continuous machining equipment for internal threads of nuts according to claim 4, characterized in that, It also includes a buffer mechanism (9), which includes a buffer discharge pipe (91) and an active buffer (92). The buffer discharge pipe (91) is vertically arranged and located below the receiving ring (81). The upper end of the buffer discharge pipe (91) is connected to the receiving ring (81) and communicates with the discharge port (811). The active buffer (92) includes a coil controller and a plurality of electromagnetic coils (921) coaxially sleeved on the outer wall of the buffer discharge pipe (91). The plurality of electromagnetic coils (921) are arranged sequentially at intervals along the axial direction of the buffer discharge pipe (91). The plurality of electromagnetic coils (921) are electrically connected to the coil controller.

9. A continuous machining equipment for internal threads of nuts according to claim 8, characterized in that, It also includes a valve plate mechanism (10), which includes a buffer plate (101). The buffer plate (101) is disposed at the lower end of the buffer discharge pipe (91) and the buffer plate (101) closes the buffer discharge pipe (91). One end of the buffer plate (101) is hinged to the buffer discharge pipe (91), and an elastic reset member (102) is provided between the buffer plate (101) and the buffer discharge pipe (91).

10. A continuous machining equipment for internal threads of nuts according to claim 9, characterized in that, The buffer plate (101) is hinged at one end along its own length to the lower end of the buffer discharge pipe (91). A counterweight (103) is provided on the buffer plate (101). The counterweight (103) is slidably connected to the buffer plate (101) along the length of the buffer plate (101). A locking and positioning component (104) is provided between the counterweight (103) and the buffer plate (101).

Images