High-precision point iridium welding device and process

Abstract

The invention discloses a high-precision point iridium welding device and process, and relates to the technical field of pen point welding. The device comprises a conveying assembly capable of moving along an annular path, a welding assembly arranged below the conveying path and positioning tools arranged corresponding to conveying blocks. The conveying assembly comprises a plurality of conveying blocks, and the positioning tool is used for inserting a to-be-welded pen point base material; the welding assembly comprises a hopper, a feeding pipe coaxially connected with the hopper in a sliding mode, an electrode ring fixed to the top end of the feeding pipe and an inverted-cone-frustum-shaped iridium particle groove formed in the top end. The hopper can be filled with iridium particles to be welded, the feeding pipe can ascend and descend in the vertical direction, and the iridium particle groove can bear one iridium particle. Through cooperation of the conveying block and the positioning tool, quick assembly and feeding of the pen point base material are facilitated, the feeding difficulty is reduced, and manual feeding is more labor-saving.

Description

Technical Field

[0001] This invention relates to the field of pen tip welding technology, specifically to a high-precision spot iridium welding device and process. Background Technology

[0002] As a traditional writing instrument, the core of a fountain pen's writing performance lies in the construction of its nib. To ensure the nib's wear resistance and smoothness, modern processes typically weld an extremely tiny hard alloy particle, known as an "iridium tip," to the tip of the nib, which is made of gold or stainless steel. The diameter of the iridium tip is usually between 0.5mm and 1.0mm. Due to iridium's extremely high melting point (approximately 2446℃) and stable chemical properties, current fountain pen nib iridium tip welding processes mostly employ electrical resistance spot welding. This method uses a specialized micro-resistance spot welding machine to apply a set welding pressure between the pre-cleaned and dried nib substrate tip and the iridium tip, and then applies a short-duration high current. This causes the contact interface to locally melt due to Joule heat generated by contact resistance and volume resistance, forming a metallurgical bond under pressure. A typical process includes: clamping the nib in a positioning fixture, using an automatic feeding and positioning mechanism to align the iridium tip with the center of the nib tip, clamping it with upper and lower electrodes, applying current for one or more pulse welding operations, followed by pressure holding and cooling.

[0003] In related technologies, when clamping the pen tip substrate in a positioning fixture, manual feeding is usually required (i.e., semi-automatic welding). During feeding, in order to ensure the alignment accuracy between the pen tip substrate and the iridium tip, the pen tip substrate needs to be placed on a designated fixture. The fixture has a pre-set limiting structure for positioning the pen tip substrate, and then the pen tip substrate needs to be assembled with the limiting structure. Since the pen tip substrate and the limiting structure are small in size, the operator needs to concentrate on maintaining a stable feeding operation during the process of picking up, aligning, and pressing the pen tip substrate. This increases the difficulty of accurately feeding the pen tip substrate and affects the overall efficiency of the welding process. Summary of the Invention

[0004] To address one of the shortcomings of existing technologies, this invention provides a high-precision spot iridium welding device and process, solving the problem of the difficulty in accurately feeding pen tip substrates.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-precision spot iridium welding device, comprising: The conveying assembly includes several conveying blocks, which can move along a circular path; The welding assembly, located below the conveying path of the conveyor block, can butt and weld the pen tip substrate to the iridium tip; A positioning fixture is provided for each conveyor block. The positioning fixture is used to insert the pen tip substrate to be welded. The welding assembly includes: The hopper can be filled with iridium granules to be welded; The feeding pipe is slidably connected to the hopper on the same axis, and the feeding pipe can rise or fall vertically. The electrode ring is fixedly installed at the top of the feed tube; An iridium granule groove is formed at the top of the feed pipe. The iridium granule groove is an inverted frustum-shaped groove, and the iridium granule groove can hold one iridium granule.

[0006] Preferably, the conveying block has a tooling groove inside, and the positioning tooling is embedded inside the tooling groove; The conveying assembly also includes: Positioning pins are set on both horizontal sides of the corresponding welding station of the conveying assembly. The positioning pins can move toward or away from the conveying block on the conveying assembly, and the positioning pins can be pinned to the conveying block.

[0007] Preferably, the welding assembly further includes: The limiting nut is threadedly connected to the portion of the feeding pipe located at the bottom of the hopper, and the limiting nut can abut against the outer side of the bottom of the hopper.

[0008] Preferably, the welding assembly further includes: The adjusting component allows for horizontal position adjustment of the feed pipe; the adjusting component includes: A fixed base is fixedly installed below the welding station corresponding to the conveying path of the conveyor block; The X-axis slide is disposed on the upper side of the fixed base and is slidably connected to the fixed base; The Y-axis slide is disposed on the upper side of the X-axis slide and is slidably connected to the X-axis slide; the hopper and the feeding pipe are both fixedly mounted on the upper side of the Y-axis slide; The sliding directions of both the X-axis slide block and the Y-axis slide block are horizontal, and their sliding directions are perpendicular.

[0009] Preferably, the positioning fixture includes: The substrate groove is a slot opened inside the positioning fixture. The substrate groove is used to accommodate and position the pen tip substrate. Electrode sheets are fixedly disposed on the inner wall of the substrate groove; The positioning rod is rotatably disposed inside the substrate groove. When the pen tip substrate is inserted into the substrate groove, the edge of the pen tip substrate and the rod body of the positioning rod are in contact.

[0010] Preferably, the positioning fixture further includes: Two sliding plates are arranged in parallel, and the sliding plates are slidably connected to the wall of the substrate groove; the two ends of the positioning rod are respectively rotatably connected to one of the sliding plates; A tension spring is provided on one side of the slide plate, which provides a restoring force to the slide plate toward the electrode plate.

[0011] Preferably, the positioning fixture further includes: The pressure wheel is rotatably connected to the positioning rod; A clamping block is fixedly disposed on the radial outer side of the clamping wheel, and the clamping block is a variable diameter protrusion; When the conveyor block moves to the lower side of the conveyor path, the clamping block can clamp the pen tip substrate inside the positioning fixture.

[0012] Preferably, the positioning fixture further includes: A counterweight is disposed on the side of the clamping wheel opposite to the clamping block; A limiting rod is disposed between the sliding plates; the counterweight is located on the side of the limiting rod away from the electrode plate.

[0013] Preferably, the positioning fixture further includes: A positioning sleeve is fixedly installed inside the positioning fixture, with one end of the positioning sleeve fixedly connected to the electrode plate; and the positioning sleeve corresponds to one of the positioning pins, which can pass through the conveying block and be inserted into the positioning sleeve. The end of the positioning pin of the corresponding positioning sleeve is electrically connected to the external welding power source.

[0014] Preferably, it also includes: The detection component is located behind the conveyor block in the conveying direction relative to the welding station; the detection component includes: The cassette can rise or fall vertically; the cassette can be inserted into the conveyor block. Two vision cameras are provided, symmetrically arranged on both sides of the dark box. After the dark box and the conveyor block are connected, the vision cameras are located on both sides of the pen tip substrate, which can visually inspect the welding quality of the iridium granules.

[0015] Preferably, it also includes: A material collection support is disposed behind the detection component relative to the conveying direction of the conveying block; the material collection support includes: There are two feed troughs, one for collecting qualified and the other for collecting unqualified pen tip substrates; The insert plate can move toward or away from the conveyor block, and can be inserted into the conveyor block to push the slide plate.

[0016] A spot iridium welding process, using the aforementioned high-precision spot iridium welding apparatus, includes the following steps: S1. Pen tip substrate loading: Insert the pen tip substrate to be welded into the positioning fixture with the tip facing upward. Use the rotation of the positioning rod to guide the pen tip substrate during insertion, and use the elastic sliding force of the positioning rod to press and position the edge of the pen tip substrate. S2. Internal positioning of pen tip substrate: During the process of the pen tip substrate moving to the welding station, the clamping block automatically clamps the pen tip substrate and provides an upward thrust. S3. External positioning of pen tip substrate: The conveyor block moving to the welding station is positioned in the horizontal direction by positioning pins; one of the positioning pins is inserted into the positioning fixture and abuts against the electrode plate in the positioning fixture, thereby connecting to the external welding power source. S4, Iridium granule feeding: Drive the feeding tube to rise, causing the feeding tube to push out an iridium granule; S5. Welding of iridium tip to pen tip substrate: The feed tube rises until the iridium tip contacts the tip of the pen tip substrate, and the welding of the iridium tip and the tip of the pen tip substrate is completed. S6, Visual Inspection: Release the positioning restrictions on the pen tip substrate, allowing the soldered pen tip substrate to move above the inspection component, driving the dark box to rise, so that the pen tip substrate is located in the dark chamber formed by the dark box, and then illumination and visual inspection are provided by the vision camera. S7. Pen tip substrate unloading: After the detection component completes the detection and reset, the pen tip substrate moves to the top of the guide groove. Based on the visual inspection results of the pen tip substrate, the positioning fixture is released from its limit on the pen tip substrate, so that the pen tip substrate falls into the inner side of the corresponding guide groove due to its own weight. S8. Reset: The positioning fixture is moved back to the top of the conveying path by the conveyor block, and the internal structure of the positioning fixture is reset, waiting for subsequent repeated feeding.

[0017] Compared with existing technologies, this solution has the following advantages: By setting up a combined conveyor block and positioning fixture, the pen tip substrate can be quickly assembled into the inner side of the substrate groove for feeding, which reduces the difficulty of feeding the pen tip substrate. In particular, it makes the installation of the pen tip substrate more labor-saving during manual feeding.

[0018] This solution uses a conveyor block and positioning fixtures to perform dual external and internal positioning of the pen tip substrate during welding, ensuring stability during the welding process.

[0019] This solution allows for adjustment of the feeding position of the feeding tube by setting up an adjustment component, ensuring adjustable adaptability to different pen tip substrates. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of one side of an embodiment of this application; Figure 2 This is a three-dimensional structural diagram of another side of an embodiment of this application; Figure 3 This is a schematic diagram of the assembly structure of the conveying component and the positioning fixture in an embodiment of this application; Figure 4 This is a schematic diagram of the welding assembly in an embodiment of this application; Figure 5 This is a schematic diagram of the positioning pin structure in an embodiment of this application; Figure 6 This is a schematic diagram of the structure of the feeding tube and iridium granules in an embodiment of this application; Figure 7 This is a schematic diagram of the conveyor block and positioning fixture in an embodiment of this application; Figure 8 This is a schematic diagram of the positioning tooling in an embodiment of this application; Figure 9 This is an exploded structural diagram of the positioning tooling in an embodiment of this application; Figure 10 This is a schematic diagram of the back structure of the positioning tooling in an embodiment of this application; Figure 11 This is a schematic diagram of the positioning fixture and the pen tip substrate locked together in an embodiment of this application. Figure 12 This is a schematic diagram of the structure of the detection component in an embodiment of this application; Figure 13 This is a schematic diagram of the internal structure of the detection component in an embodiment of this application; Figure 14 for Figure 2 Enlarged structural diagram at point A; Figure 15 for Figure 2 Enlarged structural diagram at point B; Figure 16 for Figure 4 A magnified structural diagram at point C.

[0021] In the picture: 100. Pen tip substrate; 200. Iridium tip; 1. Conveying assembly; 11. Main support; 12. Conveying block; 121. Tooling slot; 122. Positioning hole; 123. Insertion hole A; 124. Insertion hole B; 13. Support leg; 14. Base; 15. Fixing frame A; 16. Cylinder A; 17. Positioning pin; 18. Fixing frame B; 19. Sprocket; 110. Chain; 111. Motor; 2. Welding assembly; 21. Hopper; 22. Feeding pipe; 23. Electrode ring; 24. Iridium granule groove; 25. Upright rod; 26. Fixing plate; 27. Cylinder B; 28. Limit nut; 29. ​​Y-axis slide; 210. X-axis slide; 211. Adjusting bolt A; 212. Fixing seat; 213. Adjusting bolt B; 3. Positioning fixture; 31. Substrate groove; 32. Electrode sheet; 33. Positioning rod; 34. Slide plate; 35. Slide groove; 36. Notch; 37. Tension spring; 38. Pressure wheel; 39. Pressure block; 310. Counterweight; 311. Limiting rod; 312. Through hole; 313. Positioning sleeve; 4. Detection components; 41. Dark box; 42. Insert block; 43. Vision camera; 44. Cylinder C; 5. Material collection support; 51. Support plate; 52. Material guide chute; 53. Cylinder D; 54. Insert plate. Detailed Implementation

[0022] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0023] Please see Figures 1-16 This application provides the following technical solutions: A high-precision spot iridium welding device includes a conveying assembly 1, a welding assembly 2, and a positioning fixture 3. The conveying assembly 1 includes a main support 11. The main support 11 is an elongated oval support structure, with several conveying blocks 12 evenly spaced on its outer side. During operation, the conveying blocks 12 move synchronously. Support legs 13 and a base 14 are located below the main support 11. The base 14 is used to place the device in its working position, and the main support 11 is supported on the base 14 via the support legs 13. For the drive mechanism of the conveying blocks 12, this design uses a combination of sprockets and chains as the transmission method. Two sets of sprockets 19 are rotatably mounted inside the main support 11, with a chain 110 surrounding the sprockets 19. One set of sprockets 19 is linked to a motor 111, driving the sprockets 19 to rotate. The motor 111 is fixedly connected to the main support 11, and the conveying blocks 12 are fixedly mounted on the chain 110.

[0024] Welding assembly 2 is positioned on the upper side of base 14 and below main support 11, and is also located on the conveying path of conveying block 12. Welding assembly 2 includes a hopper 21, with a feeding pipe 22 slidably disposed inside the hopper 21. The feeding pipe 22 and hopper 21 are coaxially arranged and can be raised and lowered. Figure 16 As shown, an electrode ring 23 is fixedly installed at the top of the feeding tube 22. An iridium granule groove 24 is opened on the inner side of the feeding tube 22 and the electrode ring 23. The iridium granule groove 24 is an inverted frustum-shaped groove for placing iridium granules 200. The welding assembly 2 is used for welding the iridium granules.

[0025] One positioning fixture 3 is fixedly installed for each conveying block 12. The positioning fixture 3 is used to fix the pen tip substrate 100 to be welded. The positioning fixture 3 has a substrate groove 31 inside for accommodating and positioning the pen tip substrate 100. An electrode plate 32 is attached to the inner side of the substrate groove 31. A positioning rod 33 is provided inside the substrate groove 31. The positioning rod 33 is rotatable. A space is reserved between the positioning plate 33 and the electrode plate 32 for placing the pen tip substrate 100. After the pen tip substrate 100 is placed into the substrate groove 31, its two sides abut against the rod body of the positioning rod 33, and the arc-shaped protrusion on the side is attached to the electrode plate 32.

[0026] During operation, the insertion end of the pen tip substrate 100 to be welded is inserted into the inner side of the substrate groove 31 by manual labor or a robotic arm. During insertion, the rotation of the positioning rod 33 provides guidance, ensuring that the outer side of the insertion end of the pen tip substrate 100 mates with the substrate groove 31, and that the bent side of the pen tip substrate 100 is in contact with the body of the positioning rod 33, reducing resistance during insertion. The positioning rod 33 blocks the bent portion of the pen tip substrate 100 to ensure proper contact between the pen tip substrate 100, the substrate groove 31, and the electrode sheet 32. The motor 111 drives the sprocket 19 to rotate, causing the chain 110 to intermittently move the conveyor block 12, thus moving the already loaded positioning fixture 3 to the lower welding station.

[0027] The hopper 21 inside the welding assembly 2 is filled with iridium granules to be welded. Initially, the feeding pipe 22 is located at the bottom of the hopper 21, and the iridium granules in the hopper 21 gather towards the bottom. When the pen tip substrate 100 moves to the welding station with the conveyor block 12, the feeding pipe 22 moves upward. The iridium granule groove 24 on the inner side of the electrode ring 23 supports an iridium granule 200 and moves it upward. The iridium granule 200 is axially positioned by the conical structure of the iridium granule groove 24, so that the electrode ring 23 drives the iridium granule 200 to maintain a certain welding accuracy with the tip of the pen tip substrate 100. By setting the substrate groove 31 and the positioning rod 33 to initially position and fix the pen tip substrate 100, the pen tip substrate 100 can be easily and quickly assembled into the conveyor block 12 for feeding, reducing the difficulty of feeding the pen tip substrate 100, especially in the process of manual feeding, making the installation of the pen tip substrate 100 more labor-saving.

[0028] Based on the above implementation scheme, the positioning fixture 3 also includes a clamping wheel 38. The clamping wheel 38 is rotatably mounted inside the substrate groove 31 via a positioning rod 33. The clamping wheel 38 is located in the middle of the positioning rod 33 and is rotatably connected to the positioning rod 33. The length of the positioning rod 33 is greater than the thickness of the wheel body of the clamping wheel 38. A clamping block 39 is fixedly mounted on the radial outer side of the clamping wheel 38. The clamping block 39 is a variable-diameter block protruding outward from the clamping wheel 38. When the conveying block 12 moves to below the main support 11, the clamping wheel 38 drives the clamping block 39 to rotate toward the pen tip substrate 100 inside the substrate groove 31. The clamping block 39 applies clamping force to the pen tip substrate 100 by relying on its variable-diameter outer circumference, ensuring the stability of the pen tip substrate 100 in the substrate groove 31. This avoids the situation where the pen tip substrate 100 is affected by vibration caused by the operation of the welding device when it moves to the welding station.

[0029] Based on the above implementation scheme, a counterweight 310 is provided on the outer side of the clamping wheel 38 away from the clamping block 39. The counterweight 310 drives the clamping wheel 38 to rotate, thereby realizing the clamping and releasing of the pen tip 100 by the clamping block 39. Figure 2 and Figure 8 This is a schematic diagram showing the positioning fixture 3 located on the upper side of the main support 11. Figure 11 This is a schematic diagram showing the positioning fixture 3 positioned below the main support 11. When the positioning fixture 3 is positioned above the main support 11, the counterweight 310 rotates the clamping wheel 38 due to its own weight, and the clamping block 39 moves away from the electrode sheet 32 ​​in the substrate groove 31, leaving space for the pen tip substrate 100. During the movement of the positioning fixture 3 towards the lower side of the main support 11, the positioning fixture 3 flips, again due to the weight of the counterweight 310 causing the clamping wheel 38 to rotate. At this time, the clamping block 39 moves closer to the pen tip substrate 100 inside the substrate groove 31, pressing against the pen tip substrate 100. Figure 11 As shown, when the positioning fixture 3 is inverted, the counterweight 310 drives the clamping block 39 to apply an upward pushing force to the pen tip substrate 100.

[0030] Based on the above implementation scheme, and considering that it is easier for staff to place the pen tip substrate 100 into the substrate groove 31, see [link to implementation]. Figure 9A sliding groove 35 is formed on the two walls of the substrate groove 31. A sliding plate 34 is slidably connected in each groove 35. A positioning rod 33 and a limiting rod 311 are arranged between the two sliding plates 34. With the positioning fixture 3 positioned above the main support 11 as a reference, the positioning rod 33 is located above the limiting rod 311. The positioning rod 33 and the sliding plate 34 are rotatably connected, and the limiting rod 311 and the sliding plate 34 are fixedly connected. By sliding the sliding plate 34 in the groove 35, the positioning rod 33 and the limiting rod 311 can move toward or away from the electrode sheet 32. A tension spring 37 is provided inside the groove 35. The two ends of the tension spring 37 are connected to the sliding plate 34 and the inside of the groove 35, respectively, and a restoring force is applied to the sliding plate 34 through the tension spring 37.

[0031] In addition, two recesses 36 are symmetrically opened on the groove wall of the substrate groove 31, and the slide groove 35 extends into the recesses 36. The end part of the slide plate 34 connected with the positioning rod 33 and the limiting rod 311 is located inside the recesses 36, and the recesses 36 satisfy that this end of the slide plate 34 can slide slightly inside it.

[0032] This structure allows for several advantages. First, the sliding positioning rod 33 allows the pen tip substrate 100 to be slightly pushed away from the electrode plate 32 during installation, making it easier to install the pen tip substrate 100 into place. The tension spring 37 ensures the positioning rod 33 returns to its original position. Second, a limiting rod 311 ensures the correct position of the counterweight 310. The counterweight 310 is positioned on the side of the limiting rod 311 away from the electrode plate 32.

[0033] When the positioning fixture 3 is positioned above the main support 11, the counterweight 310 adheres to the limiting rod 311 due to its own weight, and the clamping block 39 moves slightly away from the pen tip substrate 100 in the substrate groove 31. The limiting rod 311 controls the clamping block 39 to prevent it from moving excessively away from the pen tip substrate 100, thus ensuring that when the conveying block 12 moves downward, the clamping block 39 in the positioning fixture 3 can quickly adhere to the pen tip substrate 100, preventing displacement of the pen tip substrate 100. When the conveying block 12 rotates back to the upper side of the main support 11, the clamping block 39 automatically releases its pushing action on the pen tip substrate 100 under the action of the counterweight 310.

[0034] Based on the above implementation scheme, in actual use, for pen tip substrates 100 of different specifications, the positioning fixture 3 can be replaced to adapt to different shapes of positioning structures. As the positioning fixture 3 is replaced and the specifications of the pen tip substrate 100 change, the position of the tip of the pen tip substrate 100 changes accordingly. Therefore, the welding component 2 also needs to be adjusted accordingly to ensure that the iridium 200 at the upper end of the feeding tube 22 can be accurately aligned with the pen tip substrate 100.

[0035] See Figure 4 and Figure 6The welding assembly 2 also includes an adjustment assembly for adjusting the position of the feeding tube 22. The adjustment assembly includes a fixed seat 212 fixedly mounted on the base 14. An X-axis slide 210 is slidably connected to the upper side of the fixed seat 212, and a Y-axis slide 29 is slidably connected to the upper side of the X-axis slide 210. The sliding directions of the Y-axis slide 29 and the X-axis slide 210 are both horizontal and perpendicular. Adjusting bolts A211 and B213 are respectively provided for the Y-axis slide 29 and the X-axis slide 210. Two adjusting bolts A211 and B213 are provided, and the two adjusting bolts B213 are symmetrically arranged on both sides of the X-axis slide 210. The adjusting bolts B213 are rotatably connected to the X-axis slide 210, and the adjusting bolts B213 are threadedly connected to the fixed seat 212. Similar to this configuration, two adjusting bolts A211 are located on both sides of the Y-axis slide 29. The ends of adjusting bolts A211 are rotatably connected to the Y-axis slide 29, and adjusting bolts A211 are threadedly connected to the X-axis slide 210. A cylinder B27 is vertically fixed at the center of the upper side of the Y-axis slide 29. Three uprights 25 are distributed around the cylinder B27. A horizontal fixed plate 26 is connected to the middle of the uprights 25. The cylinder B27 passes through the fixed plate 26, with its movable end being the upper end. The bottom end of the feeding pipe 22 is fixedly connected to the movable end of the cylinder B27. The top end of the uprights 25 is fixedly connected to the lower side of the hopper 21. The feeding pipe 22 passes through the bottom of the hopper 21. The portion of the feeding pipe 22 located on the lower side of the hopper 21 is threadedly connected to a limit nut 28. The limit nut 28 can abut against the lower side of the hopper 21 during the upward movement of the feeding pipe 22, thereby limiting the upward distance of the feeding pipe 22 during iridium granule welding.

[0036] By rotating adjusting bolts A211 and B213, the hopper 21 can move freely in the X and Y axes, thereby ensuring the position of the iridium granule 200 at the top of the feeding tube 22 relative to the tip of the pen tip substrate 100.

[0037] Based on the above implementation plan, see Figure 5 To ensure consistency in the welding reference for each pen tip substrate 100, a fixing bracket A15 is fixedly installed on each of the two horizontal outer sides of the main bracket 11, corresponding to the welding station. A cylinder A16 is fixedly installed on the lower part of each of the two fixing brackets A15. The cylinder A16 is horizontally positioned, and its movable end is fixedly connected to a positioning pin 17.

[0038] See Figure 7 and Figure 15On one side of the conveyor block 12, a positioning hole 122 is provided corresponding to one of the positioning pins 17. The positioning hole 122 is a frustoconical hole into which the positioning pin 17 can be inserted. On the other side of the conveyor block 12, an insertion hole B124 is provided corresponding to another positioning pin 17. A positioning sleeve 313 is fixedly provided on the positioning fixture 3 corresponding to the insertion hole B124. The positioning sleeve 313 has a flared structure, with its larger end facing the insertion hole B124, and the positioning sleeve 313 and the insertion hole B124 are coaxial. The positioning pin 17 can pass through the insertion hole B124 and be inserted into the positioning sleeve 313. One side of the positioning sleeve 313 extends to the side of the electrode plate 32 and is fixedly connected to the electrode plate 32. The positioning pin 17 corresponding to the positioning sleeve 313 is electrically connected to an external welding power source.

[0039] Before welding, the positioning pins 17 are driven by cylinder A16 to move closer to the conveying block 12. One positioning pin 17 is inserted into the positioning hole 122, and the other positioning pin 17 is inserted into the positioning sleeve 313 through the insertion hole B124. The two positioning pins 17, in conjunction with the positioning hole 122 and the positioning sleeve 313, position the conveying block 12 horizontally. This ensures that the tip of the pen tip substrate 100 is accurately positioned at the welding location. At the same time, the positioning pins 17 connect the electrode sheet 32 ​​to the external welding power source through the positioning sleeve 313, so that the pen tip substrate 100 is automatically connected to the welding circuit during the pre-welding positioning process.

[0040] Then, the feeding tube 22 is driven to rise inside the hopper 21, pushing out an iridium granule 200. At this time, the electrode ring 23 is also connected to the external welding power source, and the iridium granule 200 is precisely positioned with the help of the iridium granule groove 24. As the feeding tube 22 continues to rise, it drives the iridium granule 200 to contact the tip of the pen tip substrate 100. After the pen tip substrate 100 and the iridium granule 200 come into contact, due to the high contact resistance, concentrated Joule heat is generated, causing local melting of the interface. Under the pressure of the further push of the feeding tube 22, the interface is locally fused. This principle is the existing resistance welding principle.

[0041] Based on the above implementation scheme, in order to facilitate the inspection of welding quality, this scheme also provides a detection component 4, which is located below the main support 11 and behind the conveying block 12 relative to the conveying direction of the welding station.

[0042] See Figure 7 , Figure 12 and Figure 13 The conveying block 12 has a tooling groove 121 inside, and the positioning tool 3 is embedded in the tooling groove 121. After the positioning tool 3 is installed, the tooling groove 121 has a reserved space for insertion.

[0043] The inspection component 4 includes a vertically arranged cylinder C44. The movable end of the cylinder C44 is connected to a dark box 41. An insert block 42 is fixedly installed on the upper side of the dark box 41, and the insert block 42 corresponds to the reserved space in the tooling slot 121. Vision cameras 43 are symmetrically fixed on both sides of the dark box 41. After the insert block 42 and the conveying block 12 are inserted, the vision cameras 43 are located on both sides of the pen tip substrate 100 and are used to inspect the welding quality.

[0044] After welding is completed, the locating pin 17 releases its limit on the pen tip substrate 100, and the feeding tube 22 descends and resets. The conveying block 12 moves the welded pen tip substrate 100 above the detection assembly 4. The cylinder C44 drives the dark box 41 to move upward, so that the insertion block 42 on the top of the dark box 41 and the reserved space in the tooling slot 121 are inserted. The pen tip substrate 100 is placed in the dark chamber formed by the dark box 41, and then the vision cameras 43 located on both sides of the pen tip substrate 100 provide illumination and visual inspection. The welding quality of the pen tip substrate 100 and the iridium 200 is inspected based on the visual inspection system, so as to initially separate the pen tip substrate 100 with unqualified welding.

[0045] Based on the above implementation scheme, a material collection support 5 is fixedly installed on the upper side of the base 14, and a horizontal support plate 51 is fixedly installed on the material collection support 5. The lower end of the cylinder C44 is fixedly installed on the upper side of the support plate 51. A guide groove 52 is fixedly installed on the material collection support 5 below the two conveying blocks 12, which are used to collect the qualified and unqualified pen tip substrates 100 after welding, respectively.

[0046] See Figure 2 and Figure 15 A fixing frame B18 is fixedly installed on the outer side of the main support 11. Two cylinders D53 are fixedly and horizontally mounted on the fixing frame B18 corresponding to the two conveying blocks 12. Insert plates 54 are fixedly connected to the movable ends of the cylinders D53. Insertion holes A123 are correspondingly opened on the side of the conveying blocks 12 facing the insert plates 54. A through hole 312 is correspondingly opened on the side of the positioning fixture 3 near the insert plates 54, and the through hole 312 communicates with the slide groove 35. After passing through the insertion holes A123 and the through hole 312, the insert plate 54 can be inserted into the interior of the slide groove 35, pushing the slide plate 34 to slide.

[0047] After the detection component 4 completes the detection, it resets, and the conveying block 12 moves above the guide trough 52. Based on the visual inspection result of the pen tip substrate 100, the corresponding cylinder D53 drives the insert plate 54 to insert into the corresponding insertion hole A123, pushing the slide plate 34 to slide. The slide plate 34 drives the positioning rod 33 away from the pen tip substrate 100, and the clamping wheel 38 simultaneously moves away from the pen tip substrate 100, thereby releasing the positioning of the pen tip substrate 100. Due to its own weight, the pen tip substrate 100 falls into the inner side of the corresponding guide trough 52, completing the separation and collection of the qualified and unqualified pen tip substrates 100.

[0048] Based on the above implementation scheme, this application also provides a welding process for a high-precision spot iridium welding device, including the following steps: S1. Feeding the pen tip substrate 100: Insert the pen tip substrate 100 to be welded into the inner side of the substrate groove 31 with the tip facing upward. During insertion, the rotation of the positioning rod 33 serves as a guide, so that the outer side of the insertion end of the pen tip substrate 100 cooperates with the substrate groove 31, reducing the resistance during insertion. Under the action of the tension spring 37, the positioning rod 33 presses the pen tip substrate 100 tightly against the inner side of the substrate groove 31, so that the pen tip substrate 100 and the electrode sheet 32 ​​are pressed tightly together. At this time, the pressing block 39 is in a state away from the pen tip substrate 100, i.e., the initial state. S2. Internal positioning of pen tip substrate 100: Motor 111 drives sprocket 19 to rotate, causing two sets of sprockets 19 to drive conveyor block 12 to move intermittently through outer chain 110, thereby driving the already loaded positioning fixture 3 to move from the top of main support 11 to the welding station below, so that conveyor block 12 drives the pen tip substrate 100, which is initially pressed inside the positioning fixture 3, to move downward to the welding station; during the movement, when the pen tip substrate 100 rotates 90°, counterweight block 310 drives the pressing block 39 outside the pressing wheel 38 to automatically press the pen tip substrate 100 with its own weight, and provides an upward thrust; S3. External positioning of pen tip substrate 100: The positioning pin 17 is driven by cylinder A16 to move closer to the conveying block 12, so that one of the positioning pins 17 is inserted into the inside of the positioning hole 122, and the other positioning pin 17 is inserted into the inside of the positioning sleeve 313 through the insertion hole B124. Then, the pen tip substrate 100 is horizontally positioned by the two positioning pins 17 in conjunction with the positioning hole 122 and the positioning sleeve 313, so that the tip of the pen tip substrate 100 is accurately located at the welding position. At the same time, one of the positioning pins 17 connects the electrode sheet 32 ​​to the external welding power source through the positioning sleeve 313, so that the pen tip substrate 100 is automatically connected to the welding circuit during the positioning process before welding. S4, Iridium granule 200 feeding: By driving the feeding tube 22 to slide from bottom to top inside the hopper 21, the electrode ring 23 at the top of the feeding tube 22 accommodates an iridium granule 200 through the inner iridium granule groove 24, and the electrode ring 23 is connected to the external welding power source. Thus, before the iridium granule 200 is connected to the pen tip substrate 100, the iridium granule 200 is accurately positioned through the iridium granule groove 24 and connected to the external welding power source. S5. Welding of iridium 200 with pen tip substrate 100: When the feed tube 22 rises to a certain height, it causes the iridium 200 to come into contact with the tip of the pen tip substrate 100. At the contact interface between the pen tip substrate 100 and the iridium 200, due to the high contact resistance, concentrated Joule heat is generated, causing the interface to melt locally, and under the pressure of the feed tube 22 pushing further, the interface is locally fused. S6. Visual inspection: After welding, the positioning restriction on the pen tip substrate 100 is released, and the feeding tube 22 is moved downward and reset, so that the conveying block 12 moves the welded pen tip substrate 100 to the top of the dark box 41. The dark box 41 is driven to move upward by the cylinder C44, so that the insert block 42 on the top of the dark box 41 is inserted and fitted into the tooling groove 121, so that the pen tip substrate 100 is located in the dark chamber formed by the dark box 41. Then, the visual cameras 43 located on both sides of the pen tip substrate 100 provide illumination and visual inspection. S7. Unloading the pen tip substrate 100: After the detection component 4 completes the detection and reset, the pen tip substrate 100 is moved above the guide groove 52 by the conveyor block 12. According to the visual inspection result of the pen tip substrate 100, the corresponding cylinder D53 drives the insert plate 54 to insert into the inner side of the corresponding insertion hole A123. Then, through the through hole 312, it is inserted into the inside of the slide groove 35 to push the slide plate 34 to slide. The slide plate 34 drives the positioning rod 33 away from the pen tip substrate 100. At the same time, it drives the pressure wheel 38 on the outside of the positioning rod 33 away from the pen tip substrate 100, thereby releasing the fixing action of the pen tip substrate 100 and causing the pen tip substrate 100 to fall into the inner side of the corresponding guide groove 52 due to its own weight. S8. Reset: After the pen tip substrate 100 inside the substrate groove 31 is unloaded, the positioning fixture 3 is transferred back to the top of the main support 11 under the conveying of the conveying block 12. At this time, the clamping wheel 38 drives the clamping block 39 to automatically reset under the action of the counterweight block 310, so that the clamping block 39 returns to the initial state for subsequent repeated feeding.

[0049] It is worth noting that the above welding method has the following advantages: Advantage 1: Full-process automation: Through the continuous operation of steps S1 to S8, the entire process is automated, from feeding the pen tip substrate 100 and positioning it internally and externally, to feeding the iridium 200 and welding it, and then to visual inspection and automatic unloading. This greatly reduces manual intervention, effectively avoids the impact of human operation errors on welding accuracy, and improves overall production efficiency.

[0050] Advantage 2: Precise positioning and stable power connection: During the positioning stage, the pen tip substrate 100 achieves precise horizontal positioning through the positioning pin 17 in conjunction with the positioning hole 122 and the positioning sleeve 313, ensuring that the tip of the pen tip substrate 100 is in the welding position. At the same time, it is automatically connected to the welding circuit, ensuring the stability of the current path during welding and reducing welding defects caused by poor contact.

[0051] Thirdly, high-quality fusion: When the iridium 200 is fed, the feeding tube 22 drives the electrode ring 23 to accurately position the iridium 200 through the iridium groove 24 and connect it to the power supply. This makes the positional deviation of the iridium 200 when it is connected to the pen tip substrate 100 extremely small. Combined with the concentrated Joule heat generated by the contact resistance and the pressure provided by the feeding tube 22, high-quality fusion of the interface is achieved, which improves the strength and consistency of the welded joint.

[0052] Fourth advantage: precise visual inspection. In the visual inspection process, the dark box 41 forms a darkroom, which, together with the illumination and inspection of the visual camera 43, can clearly capture the details after welding, ensuring that unqualified products are accurately screened and prevented from flowing into subsequent processes.

[0053] Advantage 5: Automatic sorting and unloading: The unloading process automatically sorts the materials according to the detection results, so that the pen tip base material 100 falls into the corresponding guide groove 52 by its own gravity, thus achieving precise product diversion.

[0054] Advantage 6: Smooth cycle suitable for mass production: Positioning fixture 3 can automatically reset after unloading for repeated loading, making the entire process cycle smooth and suitable for large-scale continuous production scenarios.

[0055] In the description of this application and its embodiments, it should be understood that the terms "top", "bottom", "height", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0056] In this application and its embodiments, unless otherwise expressly specified and limited, the terms "set," "install," "connect," "link," "fix," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0057] In this application and its embodiments, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0058] The foregoing disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described above. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0059] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0060] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A high-precision spot iridium welding device, characterized by, The application relates to a welding device for welding a pen tip base and an iridium particle. The welding device comprises a conveying assembly, a welding assembly and a positioning tool. The conveying assembly comprises a plurality of conveying blocks which can move along an annular path. The welding assembly is arranged below the conveying path of the conveying blocks and can butt joint and weld the pen tip base and the iridium particle. The positioning tool is arranged corresponding to each conveying block and is used for inserting the pen tip base to be welded. The welding assembly comprises a hopper which can be filled with the iridium particle to be welded. The welding assembly further comprises an electrode ring which is fixedly arranged at the top end of the feeding pipe. The welding assembly further comprises an iridium particle groove which is arranged at the top end of the feeding pipe and is a reversed conical groove. The conveying block is internally provided with a tool groove, and the positioning tool is embedded in the tool groove.

2. The high-precision spot iridium welding device of claim 1, wherein, The conveying assembly further comprises a positioning pin which is arranged at the horizontal two sides of the welding station of the conveying assembly. The welding assembly further comprises a limiting nut which is threadedly connected with the part of the feeding pipe below the hopper. The welding assembly further comprises an adjusting assembly which can adjust the horizontal position of the feeding pipe.

3. The high-precision spot iridium welding device of claim 1, wherein, The adjusting assembly comprises a fixed seat which is fixedly arranged below the welding station of the conveying block. The X-axis sliding seat is arranged on the upper side of the fixed seat and is slidably connected with the fixed seat.

4. The high-precision spot iridium welding device of claim 3, wherein, The Y-axis sliding seat is arranged on the upper side of the X-axis sliding seat and is slidably connected with the X-axis sliding seat. The Y-axis sliding seat is arranged on the upper side of the X-axis sliding seat and is slidably connected with the X-axis sliding seat. The X-axis sliding seat and the Y-axis sliding seat are horizontally slidably arranged. The positioning tool comprises a base material groove which is a slot arranged in the positioning tool and is used for accommodating and positioning the pen tip base. The positioning tool further comprises a slide plate which is arranged in parallel with two slide plates and is slidably connected with the groove wall of the base material groove. The positioning tool further comprises a compression wheel which is rotatably connected with the positioning rod.

5. The high-precision spot iridium welding device of claim 2, wherein, The positioning tool further comprises a counterweight which is arranged on the side of the compression wheel away from the compression block. The positioning tool further comprises a limiting rod which is arranged between the slide plates. The positioning tool further comprises a positioning sleeve which is fixedly arranged in the positioning tool and is fixedly connected with the electrode sheet at one end. The end of the positioning pin corresponding to the positioning sleeve is electrically connected with the external welding power supply.

6. The high-precision spot iridium welding device of claim 5, wherein, ​ ​ ​ 7. The high-precision spot iridium welding device of claim 6, wherein, ​ ​ ​ ​ 8. The high-precision spot iridium welding device of claim 7, wherein, ​ ​ ​ 9. The high-precision spot iridium welding device of claim 8, wherein, ​ ​ ​ 10. The high-precision spot iridium welding device of claim 1, wherein, Also comprising: a detection assembly located behind the conveying block in the conveying direction relative to the welding station; the detection assembly comprising: a magazine that can be raised or lowered in the vertical direction; the magazine can be plugged with the conveying block; two visual cameras are provided, symmetrically arranged on both sides of the magazine; when the magazine and the conveying block are plugged, the visual cameras are respectively located on both sides of the pen tip substrate, and can detect the welding quality of the iridium particle.

11. The high-precision spot iridium welding apparatus of claim 6, wherein, Also comprising: a material collecting support located behind the detection assembly in the conveying direction relative to the conveying block; the material collecting support comprising: a material guide groove provided with two, respectively for collecting the qualified and unqualified pen tip substrate; a plug-in plate that can move towards or away from the conveying block, which can be inserted into the conveying block and push the sliding plate to slide.

12. The welding process of a high-precision spot iridium welding apparatus according to any one of claims 1 to 11, characterized by, The steps include: S1, pen tip substrate loading: the pen tip substrate to be welded is inserted into the positioning tool with the tip end upwards, the rotation of the positioning rod is used as the guide for the insertion of the pen tip substrate, and the elastic sliding force of the positioning rod is used to compress and position the side of the pen tip substrate; S2, internal positioning of the pen tip substrate: during the movement of the pen tip substrate to the welding station, the pen tip substrate is automatically compressed by the compression block, and an upward pushing force is provided; S3, external positioning of the pen tip substrate: the conveying block moving to the welding station is positioned in the horizontal direction by the positioning pin; one of the positioning pins is inserted into the positioning tool and abuts against the electrode sheet in the positioning tool, thereby being electrically connected with the external welding power supply; S4, iridium particle loading: driving the loading pipe to rise, so that the loading pipe ejects an iridium particle; S5, welding of iridium particle and pen tip substrate: the loading pipe rises to the point where the iridium particle contacts the tip end of the pen tip substrate, and the welding of the iridium particle and the tip end of the pen tip substrate is completed; S6, visual detection: releasing the positioning restriction of the pen tip substrate, so that the welded pen tip substrate moves above the detection assembly, driving the magazine to rise, so that the pen tip substrate is located in the dark room formed by the magazine, and then providing illumination and visual detection by the visual camera; S7, pen tip substrate unloading: after the detection assembly completes detection and resets, the pen tip substrate moves above the material guide groove, according to the visual detection result of the pen tip substrate, releasing the limiting of the positioning tool to the pen tip substrate, so that the pen tip substrate falls into the corresponding material guide groove due to its own weight; S8, reset: when the positioning tool is repositioned above the conveying path by the conveying block, the internal structure of the positioning tool is reset, and waits for subsequent repeated loading.

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