Batch automatic laser remelting equipment and method for surfaces of copper-chromium contacts

Abstract

The invention discloses a copper-chromium contact surface batch automatic laser remelting device and method, the device comprises a cabin, a substrate, a material conveying assembly and a laser, and the material conveying assembly comprises a chassis, a contact limiting piece, a second telescopic motor and a transfer assembly; the contact limiting piece is composed of a tray and at least two limiting rods, and the transferring assembly is composed of a feeding grabbing and clamping assembly and a discharging grabbing and clamping assembly; the method comprises the following steps: S1, feeding; s2, laser remelting is carried out; s3, blanking is carried out; the contacts are placed in the cabin in batches, the multiple steps of feeding, laser remelting and discharging are continuously completed in one device, continuous batch treatment of the contacts is achieved, and the production efficiency and the product quality stability are improved.

Description

Technical Field

[0001] This invention relates to the field of laser remelting technology, specifically to a batch automated laser remelting equipment and method for copper-chromium contact surfaces. Background Technology

[0002] Currently, vacuum melting and infiltration or mixed powder sintering are commonly used domestically and internationally to prepare CuCr contacts. Although the processes are mature, their inherent nature determines that the products have inherent deficiencies: voids inevitably exist between powder particles. Even after high-temperature sintering and melting, microscopic pores and defects remain. These pores act as "gas sources" in a vacuum and "weak points" under electric arc, easily leading to localized melting, metal splashing, and dielectric breakdown, severely reducing insulation strength and breaking capacity. Furthermore, Cu and Cr are poorly miscible systems. Traditional processes can only achieve macroscopic compositional uniformity; at the microscopic scale, the distribution, morphology, and particle size of the Cr and Cu phases are difficult to optimize. Larger Cr particles are easily detached under the influence of an electric arc, forming pits and accelerating erosion.

[0003] Patent CN105839037A discloses a laser surface modification method for copper-chromium alloy contacts. This method controls the laser path to process the entire surface of the copper-chromium alloy contact, resulting in a copper-chromium contact with a fine grain layer of 10-300 μm. However, this method does not involve automated batch processing equipment and processes, still relying on manual intervention. Therefore, it suffers from low production efficiency, high labor costs, and poor product consistency. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a batch automated laser remelting equipment and method for copper-chromium contact surfaces.

[0005] The technical solution of the present invention is: a batch automated laser remelting equipment for copper-chromium contact surfaces, comprising a chamber, a substrate vertically arranged on the inner wall of the chamber, two sets of material conveying components arranged symmetrically on both sides of the substrate with the substrate as the center, and a laser located above the substrate and connected to the top of the chamber. The substrate is connected to the output shaft of a first telescopic motor arranged on the bottom of the chamber. The material conveying assembly includes a chassis connected to the output shaft of a rotary motor located at the bottom of the chamber, a plurality of contact limiting members equally spaced on the chassis along the circumferential direction, a second telescopic motor located at the bottom of the chamber for driving one of the contact limiting members to move upward, and a transfer assembly for conveying contacts between the contact limiting members and the substrate. The contact limiting component consists of a tray and at least two limiting rods mounted on the chassis for limiting the sidewalls of the contact. The transfer assembly consists of a loading gripper assembly for conveying the copper-chromium contact from the contact limiting member to the substrate and a unloading gripper assembly for conveying the copper-chromium contact from the substrate to the contact limiting member. Both the loading and unloading gripper assemblies consist of a gripper and a third telescopic motor laterally arranged in the chamber for driving the gripper to move. The second telescopic motor corresponds to the position of the gripper. Sensors are provided on the rotary motor, the first telescopic motor, the second telescopic motor, the third telescopic motor, and the gripper. All sensors are electrically connected to a PLC control system located in the chamber.

[0006] Furthermore, the limiting rod is provided in three parts.

[0007] Explanation: The three limit rods can form a triangular structure, which can more stably limit the contact and thus improve the stability of feeding.

[0008] Furthermore, the limiting rod passes through a through groove provided on the chassis and is fixed with screws.

[0009] Note: The above structure simplifies the fixing of the limit rod and is not easily deformed, thus providing a more stable limit on the contact and improving the stability of feeding.

[0010] Furthermore, the substrate is provided with a fan for blowing away residue on the substrate and a dust collection device for sucking up the residue.

[0011] Note: By combining the fan and dust collection equipment, the residue generated during the laser remelting process can be collected in a centralized manner, avoiding any impact on the laser remelting process and improving the efficiency and product quality of the laser remelting process.

[0012] Furthermore, the tray is provided with a notch that can be movably engaged with the limiting rod. The side wall of the limiting rod facing the notch is provided with multiple layers of sliding grooves along the longitudinal direction and a wedge block that is rotatably connected to the sliding grooves via a torsion spring rod. The distance between two adjacent sliding grooves is the same as the thickness of the contact. The bottom width of the wedge block is smaller than the top width, and the top of the wedge block extends out of the sliding groove. The top of the limiting rod is provided with a reset assembly for moving the tray down and resetting. The reset assembly includes a toothed plate fixedly connected to the top of the limiting rod via a spring rod, a first gear disposed in a groove located at the top and meshing with the toothed plate, a transmission belt connecting the central shaft of the first gear and each torsion spring rod, and a snap-action trigger assembly that drives the toothed plate to snap into the limiting rod. The trigger assembly includes a telescopic locking pin mounted on a toothed plate for engaging with a locking hole on the side wall of a limiting rod, a first airbag rod for disengaging from the locking hole by squeezing the telescopic locking pin, and a second airbag rod mounted on a chassis for squeezing by lowering a tray; the second airbag rod is connected to the first airbag rod via an air tube.

[0013] Explanation: During the process of the pallet moving the contact head up and down once, the pallet and contact head will rub against the limit rod multiple times. This may cause wear on the limit rod and contact head during long-term use. By setting a wedge block, the pallet can maintain its height after a single upward movement and only fall back to its original position after reaching the highest point. This greatly reduces the friction between the pallet and contact head and the limit rod, significantly reduces wear on the contact head, improves product quality, and extends the service life of the limit rod and pallet.

[0014] Furthermore, the inner wall of the chute is provided with a liquid bladder for loading lubricating fluid, and the side wall of the limiting rod facing the contact is provided with multiple liquid outlet holes corresponding to the contact clamping positions, and each liquid bladder is connected to each liquid outlet hole located above the liquid bladder through a liquid outlet pipe. The wedge block is equipped with a squeezing rod for squeezing the liquid bladder when the wedge block enters the chute, and the base plate below the tray is equipped with a liquid storage bladder for squeezing when the tray moves down. The liquid storage bladder and each liquid bladder are connected by pipes.

[0015] Explanation: Although the wedge block reduces friction between the tray and the contact and the limit rod, friction still exists. Therefore, the sliding of the wedge block is used to drive the liquid bladder to release lubricant to lubricate the contact, thereby further reducing friction between the contact and the limit rod. After the tray moves up one by one, there is an empty space below the tray. The distribution of the liquid outlet pipe ensures that only the liquid outlet hole located above the tray is triggered to release liquid, avoiding waste of lubricant.

[0016] Furthermore, the side wall of the tray is provided with cotton pads for wiping lubricant.

[0017] Note: Lubricant may remain on the limit rod during feeding. Therefore, you can clean the limit rod with a cotton pad to avoid hygiene problems caused by long-term exposure and accumulation of lubricant.

[0018] A method for automated batch laser remelting of copper-chromium contact surfaces using any of the above-mentioned devices includes the following steps: S1, Loading Material Open the chamber, stack multiple contacts with a diameter of 10-300mm and a thickness of 3-30mm on the tray of the feeding assembly located on one side of the substrate, and move the limiting rod to limit the side wall of the contact until all contacts are placed. After closing the chamber, first rotate any pallet to the position to be gripped by the rotating motor, then move the pallet located at the position to be gripped upward by the second telescopic motor until the contact at the top of the pallet moves up by the thickness of one contact. After the gripper grabs the contact, it transfers the contact to the base plate by the third telescopic motor. Then the gripper and the second telescopic motor are reset. S2, Laser Remelting After the contact is placed on the substrate, the substrate is moved by the first telescopic motor so that the contact is aligned with the laser focus emitted by the laser. After the laser remelting parameters are adjusted, printing begins. S3, Material feeding After printing is completed, the rotating motor of the feeding assembly located on the other side of the substrate drives any pallet to rotate directly below the placement station of the gripper. When the gripper picks up the contact on the substrate and places it on the pallet in the placement station, the second telescopic motor drives the pallet to descend by the thickness of one contact, thus completing the unloading of one contact. Repeat steps S1, S2, and S3 until all contacts are placed on the feeding assembly located on the other side of the substrate, thus completing the automated batch laser remelting of the contacts.

[0019] Furthermore, the parameters for the laser remelting are: energy density of 10 4 -10 6 W / cm 2 The oxygen content is 0.01-0.05%, the spot spacing is 0.01-0.2mm, the scanning rate is 0.01-5mm / s, and the power is 200-500W.

[0020] Explanation: By scanning the contact surface with a laser beam using the parameters described above, an extremely thin layer on the contact surface is instantly melted and rapidly solidified by the extremely high cooling rate of the substrate itself. This results in a more uniform distribution of the Cu and Cr phases, improving microscopic segregation. Furthermore, the concentrated energy minimizes the overall heat input to the CuCr contact substrate, reducing the likelihood of workpiece deformation. This non-contact, non-contamination process is suitable for the cleanliness requirements of vacuum devices.

[0021] The beneficial effects of this invention are: (1) This invention places the contacts in batches on the loading assembly, grabs the contacts onto the substrate by the gripper, and places the contacts on the unloading assembly after laser remelting. This makes the three steps of loading, laser remelting and unloading continuous in one device without manual intervention. It can process contacts in batches, improves the processing efficiency of laser remelting of copper-chromium contacts, and increases production efficiency by more than 50%. Automated positioning and parameter control ensure that the remelted layer on the contact surface is uniform (the remelted layer thickness is 10-100μm, and the Cr particles are submicron level). With the help of the fan and dust collection equipment, residue interference is avoided, and the surface roughness and cleanliness meet the standards.

[0022] (2) As the tray moves the contact up and down once, the tray and the contact will rub against the limiting rod multiple times, which may cause wear on the limiting rod and the contact during long-term use. However, by setting a wedge block, the present invention enables the tray to maintain its height after a single upward movement and only falls down once after moving to the highest point, which greatly reduces the friction between the tray and the contact and the limiting rod, significantly reduces the wear on the contact, improves product quality and extends the service life of the limiting rod and the tray.

[0023] (3) Since there is always friction between the tray and the contact and the limiting rod, the present invention further utilizes the sliding of the wedge block to drive the liquid bladder to lubricate the contact, thereby further reducing the friction between the contact and the limiting rod. Furthermore, after the tray moves up one by one, there is an empty space below the tray. The distribution of the liquid outlet pipes of each liquid bladder ensures that only the contact above the tray after each movement is lubricated, thus avoiding the waste of lubricating fluid. Attached Figure Description

[0024] Figure 1 This is an overall structural diagram of Embodiment 1 of the laser remelting equipment of the present invention; Figure 2 This is a structural diagram of the loading assembly of the laser remelting equipment of the present invention, in embodiment 1; Figure 3 This is a distribution diagram of the third telescopic motor of the laser remelting equipment of the present invention; Figure 4 This is a physical image of the product obtained by the laser remelting equipment of this invention; Figure 5 This is an overall structural diagram of Embodiment 2 of the laser remelting equipment limiting rod of the present invention; Figure 6 yes Figure 5 Enlarged view of point I in the middle; Figure 7 yes Figure 5 Enlarged schematic diagram at point II; Figure 8 This is an overall structural diagram of the reset assembly of the laser remelting equipment of the present invention; Figure 9 This is an overall structural diagram of embodiment 3 of the laser remelting equipment limiting rod of the present invention; Figure 10 This is a distribution diagram of the liquid outlet holes of the laser remelting equipment of the present invention; Among them, 1-chamber, 2-base plate, 21-first telescopic motor, 22-fan, 23-dust collection equipment, 3-chassis, 31-tray, 311-second airbag rod, 32-limiting rod, 321-wedge block, 3211-torsion spring rod, 3212-slide groove, 322-tooth plate, 323-spring rod, 324-telescopic locking column, 325-first gear, 3251-transmission belt, 326-locking hole, 327-first airbag rod, 33-rotary motor, 34-second telescopic motor, 35-gripper, 351-third telescopic motor, 36-PLC control system, 37-liquid bladder, 371-liquid outlet, 372-pressing rod, 373-liquid storage bladder. Detailed Implementation

[0025] The present invention will now be described in more detail with reference to specific embodiments, so as to better demonstrate the advantages of the present invention.

[0026] Example 1: A batch automated laser remelting equipment for copper-chromium contact surfaces, such as... Figure 1 As shown, the system includes a chamber 1, a substrate 2 vertically mounted on the inner wall of the chamber 1, two sets of conveying assemblies symmetrically arranged on both sides of the substrate 2 with the substrate 2 as the center, and a laser 4 located above the substrate 2 and connected to the top of the chamber 1. The substrate 2 is connected to the output shaft of a first telescopic motor 21 located at the bottom of the chamber 1. The substrate 2 is equipped with a fan 22 for blowing away residue on the substrate 2 and a dust collection device 23 for sucking up residue. The chamber 1 is also connected to a power supply, a laser water cooler, and a helium gas filling port. like Figure 2 and Figure 3 As shown, the material conveying assembly includes a chassis 3 connected to the output shaft of a rotary motor 33 located at the bottom of the chamber 1, nine contact limiting members equally spaced on the chassis 3 along the circumferential direction, a second telescopic motor 34 located at the bottom of the chamber 1 for driving one of the contact limiting members to move upward, and a transfer assembly for conveying contacts between the contact limiting members and the substrate 2. The contact limiting component consists of a tray 31 and three limiting rods 32 mounted on the chassis 3 for limiting the sidewalls of the contact. The tray 31 has a notch for engaging with the limiting rods 32. The limiting rods 32 pass through a through groove on the chassis 3 and are fixed with screws. The transfer assembly comprises a loading gripper assembly for conveying the copper-chromium contact from the contact limiting member to the substrate 2 and a unloading gripper assembly for conveying the copper-chromium contact from the substrate 2 to the contact limiting member. Both the loading and unloading gripper assemblies consist of a gripper 35 and a third telescopic motor 351 laterally disposed on the chamber 1 for driving the gripper 35 to move. The second telescopic motor 351 corresponds to the position of the gripper 35; that is, the second telescopic motor 351 corresponds to the position within the movement area of ​​the gripper 35. The motor 34 is located at a position where the gripper 35 can grasp. The rotary motor 33, the first telescopic motor 21, the second telescopic motor 34, the third telescopic motor 351, and the gripper 35 are all equipped with sensors. The sensors are all electrically connected to the PLC control system 36 installed in the compartment 1. The laser 4, the fan 22, the dust collection device 23, the rotary motor 33, the first telescopic motor 21, the second telescopic motor 34, the third telescopic motor 351, the gripper 35, the sensors, and the PLC control system 36 are all commercially available equipment.

[0027] The method for automated batch laser remelting of copper-chromium contact surfaces using the above-mentioned equipment includes the following steps: S1, Loading Material Open the chamber 1, stack multiple contacts with a diameter of 200mm and a thickness of 15mm on the tray 31 of the feeding assembly located on the right side of the substrate 2, and move the limiting rod 32 to limit the side wall of the contact. Fix the limiting rod 32 with screws until all contacts are placed. After closing the chamber 1, first rotate any pallet 31 to be directly below the gripper 35 by rotating the motor 33. Then, move the pallet 31 located at the gripper position upward by the second telescopic motor 34 until the contact at the top of the pallet 31 moves up by the thickness of one contact. After the gripper 35 grabs the contact, it transfers the contact to the base plate 2 by the third telescopic motor 351. Then, the gripper 35 and the second telescopic motor 34 are reset. S2, Laser Remelting After the contact is placed on the substrate 2, the substrate 2 is moved by the first telescopic motor 21 so that the contact is aligned with the laser focus emitted by the laser 4. After the laser remelting parameters are adjusted, printing begins. During the printing process, the fan 22 and dust collection device 23 are turned on to collect the residue generated by laser remelting. The fan speed is 3m / s. The parameters for the laser remelting are: energy density of 10. 5 W / cm 2 The oxygen content is 0.03%, the spot spacing is 0.1 mm, the scanning rate is 0.25 mm / s, and the power is 350 W. S3, Material feeding After printing is completed, the rotating motor 33 of the feeding assembly located on the left side of the substrate 2 drives the chassis 3 to rotate directly below the waiting position of the gripper 35. After the gripper 35 picks up the contact on the substrate 2 and places it on the tray 31 located at the waiting position, the second telescopic motor 34 drives the tray 31 to descend by the thickness of one contact, thus completing the unloading of one contact. The finished contact is shown in the figure. Figure 4 As shown; Repeat steps S1, S2, and S3 until all contacts are placed on the feeding assembly located on the other side of substrate 2, thus completing the automated batch laser remelting of the contacts.

[0028] Example 2: This example differs from Example 1 in that, as Figure 5 As shown, the tray 31 has a notch that can be movably engaged with the limiting rod 32. The side wall of the limiting rod 32 facing the notch has multiple layers of sliding grooves 3212 along the longitudinal direction and a wedge block 321 rotatably connected to the sliding grooves 3212 via a torsion spring rod 3211. The distance between two adjacent sliding grooves 3212 is the same as the thickness of the contact. It can be understood that in this embodiment, the specifications of the contact are 54mm (diameter) × 6mm (thickness). The limiting rod 32 is a contact limiting component dedicated to this contact. That is, the distance between two adjacent sliding grooves 3212 on the limiting rod 32 is 6mm. If a batch of contacts with different thicknesses than those in this embodiment are replaced for mass laser remelting, the limiting rod 32 is replaced accordingly so that the distance between two adjacent sliding grooves 3212 is adapted to the thickness of the replaced contact. The bottom width of the wedge block 321 is 2cm less than the top width, and the top of the wedge block 321 extends 1cm beyond the sliding groove 3212. like Figure 6 , Figure 7 and Figure 8 As shown, the top of the limiting rod 32 is provided with a reset assembly for moving the tray 31 down to reset. The reset assembly includes a toothed plate 322 fixedly connected to the top of the limiting rod 32 via a spring rod 323, a first gear 325 disposed in a slide groove 3212 located at the top and meshing with the toothed plate 322, a transmission belt 3251 connecting the central shaft of the first gear 325 and each torsion spring rod 3211, and a locking trigger assembly that drives the toothed plate 322 to engage with the limiting rod 32. It can be understood that the transmission stages of the torsion spring rod 3211 and the transmission belt 3251 are within the number of stages that can achieve effective transmission. like Figure 6 , Figure 7 and Figure 8As shown, the trigger assembly includes a telescopic locking post 324 disposed on the toothed plate 322 for engaging with a locking hole 326 provided on the side wall of the limiting rod 32, a first airbag rod 327 for squeezing the telescopic locking post 324 to disengage it from the locking hole 326, and a second airbag rod 311 disposed on the chassis 3 for squeezing by the downward movement of the tray 31; the second airbag rod 311 is connected to the first airbag rod 327 through an air tube. It can be understood that the air tube includes a spiral air tube between the second airbag rod 311 and the limiting rod 32 and a fixed air tube disposed within the limiting rod 32.

[0029] The method for batch automated laser remelting of copper-chromium contact surfaces using the above-mentioned equipment is as follows: During the process of moving the tray 31 up by the thickness of one contact, the tray 31 will squeeze the wedge block 321, causing the wedge block 321 to retract into the slide groove 3212 under the action of the torsion spring rod 3211. After the tray 31 has moved up, the wedge block 321 will reset under the action of the torsion spring rod 3211, so that the top of the wedge block 321 supports the tray 31 and prevents the tray 31 from falling. When the tray 31 moves up for the last part of its stroke, the tray 31 pushes the toothed plate 322 upward, which drives the first gear 325 to rotate. The first gear 325 drives each torsion spring rod 3211 to rotate synchronously through the transmission belt 3251, so that all the wedge blocks 321 on the limit rod 32 retract into the slide groove 3212. After the upward movement is completed, the toothed plate 322 is pushed to the telescopic pin 324 and engages in the locking hole 326 on the limit rod 32. Thus, after the last contact is grabbed, the toothed plate 322 remains fixed, and the second telescopic motor 34 and the tray 31 move down and reset at the same time. When the tray 31 moves down to near the chassis 3, it begins to squeeze the second airbag rod 311, which drives the first airbag rod 327 to extend and gradually disengage the telescopic pin 324 from the locking hole 326. Thus, the toothed plate 322 resets under the action of the spring rod 323, and the wedge blocks 321 also reset under the action of the torsion spring rod 3211. Thus, after each contact is scanned, the tray 31 only needs to move upward by the same height, without having to move downward again. The tray 31 only drops once after all contacts have been loaded, reducing wear between the tray 31, the contacts, and the limit rod 32.

[0030] Example 3: This example differs from Example 2 in that, as Figure 9 and Figure 10 As shown, the inner wall of the slide groove 3212 is provided with a liquid bladder 373 for loading lubricating fluid, and the side wall of the limiting rod 32 facing the contact is provided with a plurality of liquid outlet holes 328 corresponding one-to-one with the contact clamping station. It can be understood that the contact clamping station refers to the contact placement area formed by the contact limiting member, and each liquid bladder 37 is connected to each liquid outlet hole 371 located above the liquid bladder 37 through a liquid outlet pipe. like Figure 9 , Figure 10As shown, the wedge block 321 is provided with a squeezing rod 372 for squeezing the liquid bladder 37 when the wedge block 321 enters the slide groove 3212. The base 3 below the tray 31 is provided with a liquid storage bladder 373 for squeezing when the tray 31 moves downward. The height of the liquid storage bladder 373 is 3cm lower than the height of the second air bladder rod 311. The liquid storage bladder 373 and each liquid bladder 37 are connected by pipes. It can be understood that the pipes consist of an inlet pipe that is set inside the limiting rod 32 and connected to the liquid inlet of the liquid bladder 37, and a spiral pipe that connects the inlet pipe and the outlet liquid bladder 373. The outlet pipe is provided with a one-way outlet valve, the inlet pipe is provided with a one-way inlet valve, and the side wall of the tray 31 is provided with a cotton pad for wiping the lubricant.

[0031] The method for batch automated laser remelting of copper-chromium contact surfaces using the above-mentioned equipment is as follows: During the process of the wedge block 321 retracting into the slide groove 3211, the wedge block 321 squeezes the liquid bladder 37, causing the lubricant to be squeezed out from each liquid outlet hole 371 located above the tray 31 to lubricate the contact and the limiting rod 32, further reducing the wear on the contact and the limiting rod 32 during the upward movement, improving product quality and the service life of the limiting rod 32; and after the tray 31 moves upward, the empty area formed below will not squeeze out lubricant and cause waste; During the upward movement and the downward repositioning of the tray 31, the liquid bladder 37 remains in a contracted state due to compression, thus not affecting the repositioning of the wedge block 321. Until the tray 31 moves down close to the chassis 3, the second air bladder rod 311 is compressed, causing the wedge block 321 to move to a position where it no longer compresses the liquid bladder 37. Then, the liquid storage bladder 373 is compressed, driving the liquid storage bladder 373 to replenish each liquid bladder 37 through the pipe. The liquid bladder 37 also repositions and extends to achieve the next lubrication.

Claims

1. A batch automated laser remelting equipment for copper-chromium contact surfaces, characterized in that, It includes a chamber (1), a base plate (2) vertically arranged on the inner wall of the chamber (1), two sets of material conveying components arranged symmetrically on both sides of the base plate (2) with the base plate (2) as the center, and a laser (4) located above the base plate (2) and connected to the top of the chamber (1). The base plate (2) is connected to the output shaft of a first telescopic motor (21) arranged at the bottom of the chamber (1). The material conveying assembly includes a chassis (3) connected to the output shaft of a rotary motor (33) located at the bottom of the chamber (1), a plurality of contact limiting members equally spaced along the circumference of the chassis (3) on the chassis (3), a second telescopic motor (34) located at the bottom of the chamber (1) for driving one of the contact limiting members to move upward, and a transfer assembly for conveying contacts between the contact limiting members and the substrate (2). The contact limiting component consists of a tray (31) and at least two limiting rods (32) disposed on the chassis (3) for limiting the contact sidewall; The transfer assembly consists of a loading gripper assembly for conveying copper-chromium contacts from the contact limiting member to the substrate (2) and a unloading gripper assembly for conveying copper-chromium contacts from the substrate (2) to the contact limiting member. The loading gripper assembly and the unloading gripper assembly each consist of a gripper (35) and a third telescopic motor (351) arranged laterally on the chamber (1) for driving the gripper (35) to move. The second telescopic motor (34) corresponds to the position of the gripper (35). The rotary motor (33), the first telescopic motor (21), the second telescopic motor (34), the third telescopic motor (351) and the gripper (35) are all equipped with sensors. The sensors are all electrically connected to the PLC control system (36) arranged in the chamber (1).

2. The automated laser remelting equipment for batch production of copper-chromium contact surfaces as described in claim 1, characterized in that, The limiting rod (32) is provided in three parts.

3. The automated laser remelting equipment for batch production of copper-chromium contact surfaces as described in claim 1, characterized in that, The limiting rod (32) passes through the through groove provided on the chassis (3) and is fixed by screws.

4. The automated laser remelting equipment for batch production of copper-chromium contact surfaces as described in claim 1, characterized in that, The substrate (2) is provided with a fan (22) for blowing away residue on the substrate (2) and a dust collection device (23) for absorbing residue.

5. The automated laser remelting equipment for batch production of copper-chromium contact surfaces as described in claim 1, characterized in that, The tray (31) is provided with a notch that can be movably engaged with the limiting rod (32). The side wall of the limiting rod (32) facing the notch is provided with multiple layers of sliding grooves (3212) along the longitudinal direction and a wedge block (321) rotatably connected to the sliding grooves (3212) via a torsion spring rod (3211). The distance between two adjacent sliding grooves (3212) is the same as the thickness of the contact. The bottom width of the wedge block (321) is smaller than the top width, and the top of the wedge block (321) extends out of the sliding groove (3212). The top of the limiting rod (32) is provided with a reset assembly for moving the tray (31) down to reset. The reset assembly includes a toothed plate (322) fixedly connected to the top of the limiting rod (32) via a spring rod (323), a first gear (325) disposed in a slide groove (3212) located at the top and meshing with the toothed plate (322), a transmission belt (3251) connecting the central shaft of the first gear (325) and each torsion spring rod (3211), and a snap-action trigger assembly that drives the toothed plate (322) to snap into the limiting rod (32). The trigger assembly includes a telescopic pin (324) disposed on the toothed plate (322) for engaging with a pin hole (326) provided on the side wall of the limiting rod (32), a first airbag rod (327) for squeezing the telescopic pin (324) to disengage it from the pin hole (326), and a second airbag rod (311) disposed on the chassis (3) for squeezing by moving the tray (31) downward; the second airbag rod (311) is connected to the first airbag rod (327) through an air tube.

6. The automated laser remelting equipment for batch production of copper-chromium contact surfaces as described in claim 5, characterized in that, The inner wall of the slide (3212) is provided with a liquid bladder (37) for loading lubricating fluid. The side wall of the limiting rod (32) facing the contact is provided with a plurality of liquid outlet holes (371) corresponding to the contact clamping station. Each liquid bladder (37) and each liquid outlet hole (371) located above the liquid bladder (37) are connected through a liquid outlet pipe. The wedge block (321) is provided with a squeezing rod (372) for squeezing the liquid bladder (37) when the wedge block (321) enters the chute (3212). The base (3) below the tray (31) is provided with a liquid storage bladder (373) for squeezing when the tray (31) moves down. The liquid storage bladder (373) and each liquid bladder (37) are connected through pipes.

7. The automated laser remelting equipment for batch production of copper-chromium contact surfaces as described in claim 6, characterized in that, The side wall of the tray (31) is provided with cotton pads for wiping the lubricant.

8. A method for automated batch laser remelting of copper-chromium contact surfaces using the equipment according to any one of claims 1 to 7, characterized in that, Includes the following steps: S1, Loading Material Open the chamber (1), stack multiple contacts with a diameter of 10-300mm and a thickness of 3-30mm on the tray (31) of the feeding assembly located on one side of the substrate (2), and move the limiting rod (32) to limit the side wall of the contact until all contacts are placed. After closing the compartment (1), first rotate any pallet (31) to the position to be gripped by the gripper (35) by rotating the motor (33), then move the pallet (31) located at the position to be gripped upward by the second telescopic motor (34) until the contact on the top of the pallet (31) moves up by the thickness of one contact. After the gripper (35) grabs the contact, it transfers the contact to the base plate (2) by the third telescopic motor (351). Then the gripper (35) and the second telescopic motor (34) reset. S2, Laser Remelting After the contact is placed on the substrate (2), the substrate (2) is moved by the first telescopic motor (21) so that the contact is aligned with the laser focus emitted by the laser (4). After the laser remelting parameters are adjusted, printing begins. S3, Material feeding After printing is completed, the rotating motor (33) of the feeding assembly located on the other side of the substrate (2) drives any pallet (31) to rotate directly below the waiting position of the gripper (35). When the gripper (35) grabs the contact on the substrate (2) and places it on the pallet (31) located at the waiting position, the second telescopic motor (34) drives the pallet (31) to descend by the thickness of one contact, thus completing the unloading of one contact. Repeat steps S1, S2, and S3 until all contacts are placed on the feeding assembly located on the other side of the substrate (2), and then the batch automated laser remelting of the contacts is completed.

9. The laser remelting method of a batch automated laser remelting equipment for copper-chromium contact surfaces as described in claim 1, characterized in that, The parameters for the laser remelting are: energy density of 10. 4 -10 6 W / cm 2 The oxygen content is 0.01-0.05%, the spot spacing is 0.01-0.2mm, the scanning rate is 0.01-5mm / s, and the power is 200-500W.

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