Plasma welding process for press-fit rivets for differentials

Abstract

The present invention provides a plasma welding process for press-fit rivets for differentials. The plasma welding process uses a plasma welding device, which includes a workbench. A welding strut is fixedly connected to the upper surface of the workbench, an L-shaped mounting block is provided on one side of the welding strut, a plasma welding gun is installed on one end of the L-shaped mounting block, two support plates are fixedly connected to the bottom surface of the workbench, and a grinding assembly is provided on the surface of the workbench. The press-fit rivets are first clamped and positioned, and the welding position of the press-fit rivets is polished and sprayed with a permeability enhancer before welding. This effectively improves the plasma welding effect of the press-fit rivets for the differential, ensures the welding quality, and meets the high-performance manufacturing requirements of the differential.

Description

Technical Field

[0001] The present invention relates to the technical field of plasma welding, and in particular to a plasma welding process for press-fit rivets for differentials. Background Art

[0002] As a key component in the transmission systems of various vehicles and mechanical equipment, the performance of the differential is directly related to the stability, reliability and operating efficiency of the entire power transmission. During the assembly process of the differential, press-fit rivets play a core role in connecting and fixing various key components. The welding quality of these rivets has become one of the key factors determining the overall quality of the differential.

[0003] Upon investigation, the disclosure (announcement) number: CN119187796A discloses a plasma welding device for copper tubes. This technology discloses "through the provision of technical solutions such as a robotic arm, a plasma welding gun, a frame, a bracket one, a bracket two, a clamping frame one, a clamping frame two, a motor, an inner shaft, an outer shaft, a slide assembly and a clamping assembly, the plasma welding gun is suspended above the copper tube by the robotic arm, thereby avoiding displacement or deformation of the welding part of the copper tube during welding, thereby improving the welding quality and other technical effects."

[0004] Although this design has the technical effects of reducing the stress during copper tube welding and improving welding quality, this welding method still has problems such as insufficient welding strength, unstable weld quality, and easy welding deformation when processing differential press rivets, which greatly reduces the overall performance of the differential. Therefore, we proposed a plasma welding process for differential press rivets. Summary of the Invention

[0005] The purpose of the present invention is to address the shortcomings of the existing technology and provide a plasma welding process for press-fit rivets for differentials. The press-fit rivets are first clamped and positioned, and the welding position of the press-fit rivets is polished and sprayed with a transparent agent before welding. This effectively improves the plasma welding effect of press-fit rivets for differentials, ensures the welding quality, and meets the high-performance manufacturing requirements of differentials.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a plasma welding device for press-fit rivets for a differential, comprising a workbench, a welding support rod fixedly connected to the upper surface of the workbench, an L-shaped mounting block provided on one side of the welding support rod, a plasma welding gun mounted on one end of the L-shaped mounting block, and two support plates fixedly connected to the bottom surface of the workbench;

[0007] The surface of the workbench is provided with a grinding assembly, which includes a grinding disc provided above the workbench and a grinding motor for grinding the press-fit rivet through the grinding disc, an upper crossbar, a vertical rod, an inclined rod, a longitudinal slide rod, a hollow rod, a first hydraulic push rod, a connecting plate, a lower crossbar, a linkage shaft, a conveyor belt, a conveyor roller, a first drive motor and a built-in rectangular slide;

[0008] A spraying assembly is provided above the workbench, and the spraying assembly includes a spray gun provided above the workbench and a second rectangular rod sleeve for spraying a transmittance enhancer on the press-fit rivet through the spray gun, a rectangular connecting rod, an infrared proximity sensor, a storage box, a delivery pipe, a linkage plate, and a rectangular fixing rod;

[0009] A clamping assembly is provided on the surface of the built-in rectangular slide, and the clamping assembly includes a pipe sleeve provided above the built-in rectangular slide, two bent connecting rods symmetrically provided inside the pipe sleeve, a sealing cover for clamping the press-fit rivet through the two bent connecting rods, a circular sealing piston, a second hydraulic push rod, a rectangular housing, an auxiliary rotating shaft and a built-in square rod;

[0010] The surface of the sealing cover is provided with a pressure stabilizing assembly, which includes a transfer sealing box provided on the surface of the sealing cover and an arc-shaped rubber block, an upper connecting rod, a positioning ring, a one-way valve and a counterweight ring for providing appropriate clamping force for the press-fit rivets.

[0011] As a preferred plasma welding process for press-fit rivets for a differential of the present invention, a built-in rectangular slide is inserted in the second rectangular slide opened on the upper surface of the workbench, and the built-in rectangular slide is slidably connected to the workbench. Two conveying rollers are arranged inside the second rectangular slide, and the surfaces of the two conveying rollers are sleeved with conveyor belts. The two conveying rollers are connected through conveyor belt transmission, and the rotating shafts of the two conveying rollers are respectively inserted in the two rotating holes opened on the front surface of the workbench, and the conveying rollers and the workbench are rotatably connected. A first driving motor is installed on the front surface of the workbench, and the output shaft of the first driving motor is fixedly connected to the end of one of the conveying roller rotating shafts, and a linkage shaft is inserted in the built-in longitudinal groove opened inside the built-in rectangular slide, and the linkage shaft is slidably connected to the built-in rectangular slide, and one end of the linkage shaft is fixedly connected to one side of the conveyor belt.

[0012] The axle up and down groove at two ends embeds respectively in two guide rails up and down of being made up of the groove on the attachment piece, and the tooth on the attachment piece is meshed with tooth on upper sprocket wheel, the lower sprocket.

[0013] The top end of the lifting link is fixedly provided with a lifting link, and the lower end of the lifting link is fixedly provided with a lifting link, and the lifting link is installed in the lifting position along the slant axis. The top of the first gear is fixedly provided with a toothed plate, and the top of the first gear is fixedly connected to the workbench, and the top of the first gear is fixedly connected to the workbench, and the top of the first gear is fixedly connected to the workbench, and the top of the first gear is fixedly connected to the workbench, and the top of the first gear is fixedly connected to the workbench.

[0014] As a preferred plasma welding process for press-fit rivets for a differential of the present invention, two transverse optical axes are fixedly connected to one side of the built-in rectangular slide, and the two transverse optical axes respectively pass through one side of the workbench transversely, and the transverse optical axes and the workbench are slidably connected.

[0015] As a preferred plasma welding process for a differential press-fit rivet of the present invention, a linkage plate is provided inside the second rectangular slide, a built-in partition plate is provided between the linkage plate and the built-in rectangular slide, the built-in partition plate is fixedly connected to the workbench, the linkage plate and the workbench are slidably connected, the end of the linkage shaft away from the conveyor belt is inserted into the through hole opened on the surface of the linkage plate, the linkage shaft and the linkage plate are slidably connected, a rectangular fixing rod is inserted into the first embedded groove opened on the side of the linkage plate away from the built-in partition plate, the rectangular fixing rod and the linkage plate are slidably connected, the rectangular fixing rod A second rectangular rod sleeve is fixedly connected to the side away from the linkage plate, a second built-in polished rod is inserted into the interior of the second rectangular rod sleeve, the second built-in polished rod and the second rectangular rod sleeve are slidably connected, the bottom end of the second built-in polished rod is fixedly connected to the workbench, the top end of the second rectangular rod sleeve is fixedly connected to a rectangular connecting rod, a spray gun is installed in the longitudinal hole opened on the upper surface of the rectangular connecting rod, an infrared proximity sensor is installed on the bottom surface of the rectangular connecting rod, a storage box is installed on the upper surface of the workbench, a delivery pipe is inserted into the upper surface of the storage box, and the other end of the delivery pipe is inserted into the feed end of the spray gun.

[0016] As a preferred plasma welding process for press-fit rivets for a differential of the present invention, a pipe sleeve is provided above the built-in rectangular skateboard, the bottom end of the pipe sleeve is fixedly connected to the bottom disc, the bottom surface of the bottom disc is fixedly connected to the built-in disc, the circumferential surface of the built-in disc is sleeved with a second bearing, the surface of the outer ring of the second bearing is fixedly connected to four L-shaped support rods, the bottom end of the L-shaped support rod is fixedly connected to the built-in rectangular skateboard, the built-in disc is rotatably connected through the second bearing and the L-shaped support rod, the upper surface of the built-in rectangular skateboard is installed with a second drive motor, and the end of the output shaft of the second drive motor is fixedly connected to the bottom surface of the built-in disc.

[0017] As a preferred plasma welding process for a press-fit rivet for a differential of the present invention, a built-in square rod is provided inside the tube sleeve, and the surface of the built-in square rod is provided with a square frame plate and a rectangular shell, the square frame plate and the built-in square rod are fixedly connected, the rectangular shell and the built-in square rod are slidably connected, and the square frame plate is slidably connected to the inside of the rectangular shell, and the surface of the built-in square rod is provided with a spring, and the two ends of the spring are respectively fixedly connected to the square frame plate and the rectangular shell, and two symmetrically arranged bending links are inserted into the mounting groove opened at the top of the built-in square rod, and the two bending links are rotatably connected to the built-in square rod through a pin shaft, and auxiliary rotating shafts are respectively inserted into the arc-shaped through grooves opened inside the two bending links, and the two auxiliary rotating shafts are respectively located in the second embedded grooves opened on the upper surface of the rectangular shell, and the auxiliary rotating shaft and the bending The connecting rod is movably connected, and the adjacent sides of the top of the two bent connecting rods are respectively fixedly connected with rubber clamps, and the bottom end of the built-in square rod is fixedly connected with four circular fixing rods in a ring array, and the end of the circular fixing rod away from the built-in square rod is fixedly connected to the pipe sleeve, and a sealing cover is provided under the rectangular shell, and two middle connecting rods are fixedly connected between the sealing cover and the rectangular shell, and a circular sealing piston is inserted into the interior of the sealing cover, and the circular sealing piston and the sealing cover are sealingly and slidingly connected. A second hydraulic push rod is installed on the upper surface of the bottom disc, and the end of the telescopic rod of the second hydraulic push rod is fixedly connected to the circular sealing piston, and an auxiliary slide is respectively inserted in the two auxiliary slide grooves opened in the pipe sleeve, and the auxiliary slide is slidably connected to the pipe sleeve, and the adjacent ends of the two auxiliary slides are respectively fixedly connected to the sealing cover.

[0018] As a preferred plasma welding process for press-fit rivets for a differential of the present invention, a one-way valve is installed in the air hole opened on the upper surface of the sealing cover, the circumferential surface of the sealing cover is fixedly connected to a transfer sealing box, the upper surface of the transfer sealing box is fixedly connected to a limit cover with air holes, a limit tube is longitudinally inserted into the upper surface of the limit cover with air holes, the limit tube and the limit cover with air holes are fixedly connected, an upper connecting rod is inserted into the interior of the limit tube, the upper connecting rod and the limit tube are slidably connected, and the bottom end of the upper connecting rod is fixedly connected to An arc-shaped rubber block, the surface of the upper connecting rod is provided with a positioning ring and a counterweight ring, the positioning ring is located above the limiting tube, the counterweight ring is located above the positioning ring, the positioning ring and the upper connecting rod are fixedly connected, the counterweight ring and the upper connecting rod are slidingly connected, the surface of the arc-shaped rubber block fits the groove wall with the exhaust hole on the upper surface of the transit sealing box, a U-shaped pipe is inserted into the upper surface of the transit sealing box, the end of the U-shaped pipe away from the transit sealing box is inserted into the upper surface of the sealing cover, and the transit sealing box is communicated with the interior of the sealing cover through the U-shaped pipe.

[0019] A plasma welding process for press-fit rivets for a differential according to the present invention includes the following steps:

[0020] Step 1: Loading and clamping: Place the press-fit rivet between the two rubber clamping jaws so that it fits the top of the pipe sleeve. Start the second hydraulic push rod to push the circular sealing piston upward, driving the relevant components of the sealing cover to move, so that the bent connecting rod rotates to clamp the press-fit rivet. During this process, the principle of air pressure balance is used to ensure that the clamping force is appropriate and stable through the connection between the transfer sealing box and the sealing cover and the arc-shaped rubber block and other components;

[0021] Step 2: Grinding: Turn on the first drive motor, and drive the built-in rectangular slide to move via the conveyor belt and the linkage shaft. When the press rivet is in place, start the grinding motor and the second drive motor. The grinding motor drives the grinding disc to rotate, and cooperates with the second drive motor to rotate the press rivet. At the same time, the grinding disc is driven by the first hydraulic push rod and the related mechanical structure to complete the grinding of the welding position. After the grinding is completed, the related components are reset.

[0022] Step 3: Spraying. During the movement of the linkage shaft, the infrared proximity sensor moves up and down according to its position change. When the press-fit rivet approaches the sensor and enters the close range, the spray gun is triggered to start. The anti-permeability agent in the storage box is atomized and sprayed out by the spray gun through the delivery pipe and coated on the polished press-fit rivet welding part. When the press-fit rivet leaves, the spray gun stops.

[0023] Step 4: Welding: The conveyor belt continues to rotate to deliver the press-fit rivets to the end of the plasma welding gun. The plasma welding gun is fed with working gas and high voltage is applied to generate plasma. The plasma melts the metal with its high temperature and high energy characteristics, and welds the pre-treated press-fit rivets.

[0024] Step 5: After unloading and welding is completed, the one-way valve allows external air to enter the sealing cover, the circular sealing piston is reset, the press-fit rivets are released, and preparations are made for the next round of processing.

[0025] The beneficial effects of the present invention are:

[0026] The present invention is beneficial to improving welding quality by providing a grinding component. The polished rivets can be better fused with other rivets during welding, reducing welding defects, and the strength and stability of the welds will be correspondingly improved, thereby improving the overall quality and performance of the differential and enhancing welding stability. The polished surface can enable the plasma arc to act on the rivets more stably, reducing arc fluctuations and making the welding process smoother.

[0027] The present invention is provided with a spraying assembly, which is conducive to automatically spraying the anti-permeability agent on the welding part of the rivet, reducing splashing during the welding process, improving the strength of the welded joint, and enhancing the load-bearing capacity and reliability of the differential press rivet during use.

[0028] The present invention is provided with a clamping assembly, which is conducive to fixing the differential press rivet at a predetermined position, ensuring that the rivet will not be displaced in subsequent operations, and ensuring the welding effect of the press rivet.

[0029] The present invention is provided with a pressure stabilizing component, which is beneficial to ensuring the clamping force of the press-fit rivet during the clamping process of the press-fit rivet, and avoiding the situation where the press-fit rivet is damaged by a large clamping force. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a process flow chart of the present invention;

[0031] Figure 2 Schematic diagram of the structure of the workbench and the first drive motor in the present invention;

[0032] Figure 3 For the present invention Figure 2 Cross-sectional view at AA in the middle;

[0033] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle;

[0034] Figure 5 For the present invention Figure 3 Enlarged view of point B in the middle;

[0035] Figure 6 For the present invention Figure 3 Enlarged view of point C in the middle;

[0036] Figure 7 Schematic diagram of the structure of the linkage plate and the rectangular fixing rod in the present invention;

[0037] Figure 8 This is a schematic structural diagram of the built-in rectangular slide and the third magnet in the present invention;

[0038] Figure 9 Schematic diagram of the structure of the bent connecting rod and the rectangular shell in the present invention;

[0039] Figure 10 Schematic diagram of the structure of the spring and the built-in square rod in the present invention;

[0040] Figure 11 Schematic diagram of the structure of the arc-shaped rubber block and the upper connecting rod in the present invention;

[0041] Figure 12 It is a structural schematic diagram of the built-in disc and the second bearing in the present invention;

[0042] Figure 13 Schematic diagram of the structure of the upper cross bar and the first rectangular rod sleeve in the present invention;

[0043] Figure 14Schematic diagram of the structure of the second tooth plate and the long gear in the present invention;

[0044] Figure 15 Schematic diagram of the structure of the workbench and built-in partition plate in the present invention;

[0045] In the picture:

[0046] 1. Workbench; 2. Support plate; 3. Welding support rod; 4. Plasma welding gun; 5. L-shaped mounting block; 6. Grinding assembly; 61. Counterweight; 62. Grinding motor; 63. Grinding shaft; 64. First bearing; 65. Grinding disc; 66. Upper crossbar; 67. Vertical bar; 68. Tilt bar; 69. Longitudinal slide bar; 610. Hollow rod; 611. First hydraulic push rod; 612. Connecting plate; 613. First rectangular slide; 614. First rectangular rod sleeve; 615. First internal polished rod; 616. First tooth plate; 617. Second tooth plate; 618 , first magnet; 619, iron pressure plate; 620, long gear; 621, built-in rotating shaft; 622, second magnet; 623, built-in rectangular slide; 624, third magnet; 625, built-in longitudinal groove; 626, linkage shaft; 627, conveyor belt; 628, conveyor roller; 629, first drive motor; 630, horizontal optical axis; 631, second rectangular chute; 632, third rectangular chute; 633, side baffle; 634, lower cross bar; 635, fourth rectangular chute; 7, spray assembly; 71, second rectangular rod sleeve; 72, rectangular connecting Rod; 73, spray gun; 74, infrared proximity sensor; 75, storage box; 76, delivery pipe; 77, second built-in polished rod; 78, linkage plate; 79, rectangular fixed rod; 710, built-in partition plate; 711, first embedded groove; 8, clamping assembly; 81, pipe sleeve; 82, bottom disc; 83, L-shaped support rod; 84, auxiliary slide; 85, auxiliary slide; 86, sealing cover; 87, second drive motor; 88, circular sealing piston; 89, second hydraulic push rod; 810, middle connecting rod; 811, circular fixed rod; 812, rectangular shell Body; 813, second embedding groove; 814, auxiliary rotating shaft; 815, rubber clamping claw; 816, bending connecting rod; 817, built-in square rod; 818, spring; 819, square frame plate; 820, mounting groove; 821, arc-shaped through groove; 822, built-in disc; 823, second bearing; 9, pressure stabilizing assembly; 91, transfer sealing box; 92, exhaust hole; 93, arc-shaped rubber block; 94, limit cover with air hole; 95, limit tube; 96, upper connecting rod; 97, U-shaped pipe; 98, positioning ring; 99, one-way valve; 910, counterweight ring. DETAILED DESCRIPTION

[0047] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0049] Example 1

[0050] like Figures 1-15 As shown, this embodiment provides a plasma welding device for press-fit rivets for differentials, comprising a workbench 1, a welding support rod 3 fixedly connected to the upper surface of the workbench 1, an L-shaped mounting block 5 provided on one side of the welding support rod 3, a plasma welding gun 4 mounted on one end of the L-shaped mounting block 5, and two support plates 2 fixedly connected to the bottom surface of the workbench 1;

[0051] The surface of the workbench 1 is provided with a grinding assembly 6, which includes a grinding disc 65, a grinding motor 62, an upper cross bar 66, a vertical bar 67, a tilting rod 68, a longitudinal slide bar 69, a hollow rod 610, a first hydraulic push rod 611, a connecting plate 612, a lower cross bar 634, a linkage shaft 626, a conveyor belt 627, a conveyor roller 628, a first drive motor 629, a built-in rectangular slide 623, a counterweight 61, a grinding shaft 63, a first bearing 64, a grinding disc 65, a first rectangular rod sleeve 614, a first built-in polished rod 615, a first gear plate 616, a second gear plate 617, a first magnet 618, an iron pressure plate 619, a long gear 620, a built-in rotating shaft 621, a second magnet 622, a third magnet 624, a horizontal optical axis 630 and a side baffle 633. The second rectangular slide groove 631 provided on the upper surface of the workbench 1 is inserted into A built-in rectangular slide 623 is provided, and the built-in rectangular slide 623 is slidingly connected to the workbench 1. Two conveying rollers 628 are provided inside the second rectangular slide 631. The surfaces of the two conveying rollers 628 are sleeved with a conveyor belt 627. The two conveying rollers 628 are connected by the conveyor belt 627. The rotating shafts of the two conveying rollers 628 are respectively inserted into the two rotating holes opened on the front surface of the workbench 1. The conveying rollers 628 and the workbench 1 are rotatably connected. A first driving motor 629 is installed on the front surface of the workbench 1. The output shaft of the first driving motor 629 is fixedly connected to the end of the rotating shaft of one of the conveying rollers 628. A linkage shaft 626 is inserted into the built-in longitudinal groove 625 opened inside the built-in rectangular slide 623. The linkage shaft 626 and the built-in rectangular slide 623 are slidingly connected, and one end of the linkage shaft 626 is fixedly connected to one side of the conveyor belt 627.

[0052] The upper surface of the workbench 1 is fixedly connected to a first built-in polished rod 615, and the surface of the first built-in polished rod 615 is sleeved with a first rectangular rod sleeve 614. The first rectangular rod sleeve 614 and the first built-in polished rod 615 are slidably connected. The top of the first rectangular rod sleeve 614 is fixedly connected to a counterweight 61. The two horizontal grooves on the surface of the first rectangular rod sleeve 614 are respectively inserted with an upper cross bar 66 and a lower cross bar 634. The upper cross bar 66 is located above the lower cross bar 634, and the upper cross bar 66 and the lower cross bar 634 are both connected to the first rectangular rod sleeve 614. The shaped rod sleeve 614 is slidably connected, the upper cross bar 66 and the lower cross bar 634 are fixedly connected to one side of the vertical rod 67, the bottom surface of the upper cross bar 66 is fixedly connected to the grinding motor 62, the end of the output shaft of the grinding motor 62 is fixedly connected to the grinding shaft 63, the bottom end of the grinding shaft 63 is fixedly connected to the grinding disk 65, the surface of the grinding shaft 63 is sleeved with a first bearing 64, the first bearing 64 is installed in the through groove opened on the surface of the lower cross bar 634, and the grinding shaft 63 is rotatably connected to the lower cross bar 634 through the first bearing 64.

[0053] The upper surface of the workbench 1 is fixedly connected with a hollow rod 610, and a longitudinal slide rod 69 is inserted into the first rectangular slide groove 613 opened on the upper surface of the hollow rod 610. The longitudinal slide rod 69 and the hollow rod 610 are slidably connected. The side of the vertical rod 67 away from the lower cross bar 634 is fixedly connected to two side baffles 633. A tilting rod 68 is inserted between the two side baffles 633. The other end of the tilting rod 68 is inserted into the groove opened at the top of the longitudinal slide rod 69. The two ends of the tilting rod 68 are respectively connected to the side baffles by axle pins. The plate 633 is rotatably connected to the longitudinal slide 69, a connecting plate 612 is inserted into the interior of the hollow rod 610, one end of the connecting plate 612 is fixedly connected to the first rectangular rod sleeve 614, the connecting plate 612 and the hollow rod 610 are slidably connected, a first hydraulic push rod 611 is installed on the upper surface of the connecting plate 612, the top of the telescopic rod of the first hydraulic push rod 611 is fixedly connected to the bottom end of the longitudinal slide 69, a first tooth plate 616 is inserted into the fourth rectangular slot 635 opened on the upper surface of the workbench 1, and the first tooth plate 616 is inserted into the fourth rectangular slot 635. 16 is slidably connected to the workbench 1, the top of the first tooth plate 616 is fixedly connected to the connecting plate 612, the interior of the workbench 1 is provided with a third rectangular chute 632 connected to the interior of the second rectangular chute 631, the interior of the third rectangular chute 632 is provided with a long gear 620 and a second tooth plate 617, the long gear 620 and the second tooth plate 617 are meshed and connected, the upper surface of the second tooth plate 617 is in contact with the inner wall of the third rectangular chute 632, and the interior of the long gear 620 is inserted with a built-in rotating shaft 621 The two ends of the built-in rotating shaft 621 are fixedly connected to the workbench 1, the long gear 620 and the built-in rotating shaft 621 are rotatably connected, the long gear 620 and the first tooth plate 616 are meshed and connected, and the two ends of the second tooth plate 617 are respectively fixedly connected with the first magnet 618 and the second magnet 622, and the built-in rectangular slide 623 is fixedly connected to the side close to the second magnet 622 with the third magnet 624, and an iron pressure plate 619 is provided inside the third rectangular slide 632, and the iron pressure plate 619 is fixedly connected to the workbench 1.

[0054] One side of the built-in rectangular slide 623 is fixedly connected to two transverse optical axes 630 . The two transverse optical axes 630 respectively pass through one side of the workbench 1 transversely. The transverse optical axes 630 and the workbench 1 are slidably connected.

[0055] A spraying assembly 7 is provided above the workbench 1, and the spraying assembly 7 includes a spray gun 73, a second rectangular rod sleeve 71, a rectangular connecting rod 72, an infrared proximity sensor 74, a storage box 75, a conveying pipe 76, a second built-in light rod 77, a linkage plate 78 and a rectangular fixed rod 79. A linkage plate 78 is provided inside the second rectangular slide 631, and a built-in partition plate 710 is provided between the linkage plate 78 and the built-in rectangular slide 623. The built-in partition plate 710 is fixedly connected to the workbench 1, and the linkage plate 78 is slidably connected to the workbench 1. The end of the linkage shaft 626 away from the conveyor belt 627 is inserted into the through hole opened on the surface of the linkage plate 78, the linkage shaft 626 and the linkage plate 78 are slidably connected, and the linkage plate 78 is inserted into the first embedded groove 711 opened on the side away from the built-in partition plate 710. A rectangular fixed rod 79 is inserted, and the rectangular fixed rod 79 is slidably connected to the linkage plate 78. The side of the rectangular fixed rod 79 away from the linkage plate 78 is fixedly connected to the second rectangular rod sleeve 71. A second built-in light rod 77 is inserted inside the second rectangular rod sleeve 71. The second built-in light rod 77 is slidably connected to the second rectangular rod sleeve 71. The bottom end of the second built-in light rod 77 is fixedly connected to the workbench 1. The top of the second rectangular rod sleeve 71 is fixedly connected to a rectangular connecting rod 72. A spray gun 73 is installed in the longitudinal hole opened on the upper surface of the rectangular connecting rod 72. An infrared proximity sensor 74 is installed on the bottom surface of the rectangular connecting rod 72. A storage box 75 is installed on the upper surface of the workbench 1. A conveying pipe 76 is inserted on the upper surface of the storage box 75. The other end of the conveying pipe 76 is inserted at the feeding end of the spray gun 73.

[0056] The surface of the built-in rectangular slide 623 is provided with a clamping assembly 8, which includes a pipe sleeve 81, a bending connecting rod 816, a sealing cover 86, a circular sealing piston 88, a second hydraulic push rod 89, a rectangular shell 812, an auxiliary rotating shaft 814, a built-in square rod 817, a bottom disc 82, an L-shaped support rod 83, an auxiliary slide 85, a second drive motor 87, a middle connecting rod 810, a circular fixing rod 811, a rubber clamping claw 815, a spring 818, a square frame plate 819, a built-in disc 822 and a second bearing 823. A pipe sleeve 81 is provided above the built-in rectangular slide 623. The bottom end of the sleeve 81 is fixedly connected to the bottom disc 82, and the bottom surface of the bottom disc 82 is fixedly connected to the built-in disc 822. The circumferential surface of the built-in disc 822 is sleeved with a second bearing 823, and the surface of the outer ring of the second bearing 823 is fixedly connected to four L-shaped support rods 83. The bottom end of the L-shaped support rod 83 is fixedly connected to the built-in rectangular slide 623, and the built-in disc 822 is rotatably connected to the second bearing 823 and the L-shaped support rod 83. The upper surface of the built-in rectangular slide 623 is installed with a second drive motor 87, and the end of the output shaft of the second drive motor 87 is fixedly connected to the bottom surface of the built-in disc 822.

[0057] The interior of the pipe sleeve 81 is provided with a built-in square rod 817, and the surface of the built-in square rod 817 is provided with a square frame plate 819 and a rectangular shell 812, the square frame plate 819 and the built-in square rod 817 are fixedly connected, the rectangular shell 812 and the built-in square rod 817 are slidably connected, and the square frame plate 819 is slidably connected to the interior of the rectangular shell 812, and the surface of the built-in square rod 817 is provided with a spring 818, and the two ends of the spring 818 are respectively fixedly connected to the square frame plate 819 and the rectangular shell 812, and two symmetrically arranged bending connecting rods 816 are inserted into the mounting groove 820 opened at the top of the built-in square rod 817, and the two bending connecting rods 816 are rotatably connected to the built-in square rod 817 through a pin shaft, and auxiliary rotating shafts 814 are respectively inserted into the arc-shaped through grooves 821 opened in the two bending connecting rods 816, and the two auxiliary rotating shafts 814 are respectively located in the second embedded grooves 813 opened on the upper surface of the rectangular shell 812. 6 is movably connected. The adjacent sides of the top of the two bent connecting rods 816 are respectively fixedly connected with rubber clamping claws 815. The bottom end of the built-in square rod 817 is fixedly connected with four circular fixed rods 811 in a ring array. The end of the circular fixed rod 811 away from the built-in square rod 817 is fixedly connected to the pipe sleeve 81. A sealing cover 86 is provided below the rectangular shell 812. Two middle connecting rods 810 are fixedly connected between the sealing cover 86 and the rectangular shell 812. A circular sealing piston 88 is inserted into the interior of the sealing cover 86. The circular sealing piston 88 and the sealing cover 86 are sealingly and slidingly connected. A second hydraulic push rod 89 is installed on the upper surface of the bottom disc 82. The end of the telescopic rod of the second hydraulic push rod 89 is fixedly connected to the circular sealing piston 88. Auxiliary slides 85 are respectively inserted into the two auxiliary slides 84 opened in the pipe sleeve 81. The auxiliary slide 85 and the pipe sleeve 81 are slidably connected. The adjacent ends of the two auxiliary slides 85 are respectively fixedly connected to the sealing cover 86.

[0058] The surface of the sealing cover 86 is provided with a pressure stabilizing component 9, which includes a transfer sealing box 91, an arc-shaped rubber block 93, a limit cover 94 with air holes, a limit tube 95, an upper connecting rod 96, a U-shaped pipe 97, a positioning ring 98, a one-way valve 99 and a counterweight ring 910. The air holes opened on the upper surface of the sealing cover 86 are installed with a one-way valve 99, the circumferential surface of the sealing cover 86 is fixedly connected with the transfer sealing box 91, the upper surface of the transfer sealing box 91 is fixedly connected with the limit cover 94 with air holes, the upper surface of the limit cover 94 with air holes is longitudinally inserted with a limit tube 95, the limit tube 95 and the limit cover 94 with air holes are fixedly connected, the interior of the limit tube 95 is inserted with an upper connecting rod 96, the upper connecting rod 96 and the limit The positioning tube 95 is slidably connected, and the bottom end of the upper connecting rod 96 is fixedly connected with an arc-shaped rubber block 93. The surface of the upper connecting rod 96 is provided with a positioning ring 98 and a counterweight ring 910. The positioning ring 98 is located above the limiting tube 95, and the counterweight ring 910 is located above the positioning ring 98. The positioning ring 98 and the upper connecting rod 96 are fixedly connected, and the counterweight ring 910 and the upper connecting rod 96 are slidably connected. The surface of the arc-shaped rubber block 93 fits the groove wall of the exhaust hole 92 on the upper surface of the transfer sealing box 91. A U-shaped pipe 97 is inserted into the upper surface of the transfer sealing box 91. The end of the U-shaped pipe 97 away from the transfer sealing box 91 is inserted into the upper surface of the sealing cover 86. The transfer sealing box 91 is connected to the interior of the sealing cover 86 through the U-shaped pipe 97.

[0059] Embodiment 2: This embodiment provides a plasma welding process for press-fit rivets for a differential, comprising the following steps:

[0060] Step 1: Loading and clamping: Place the press-fit rivet between the two rubber clamping jaws 815 so that it fits the top of the pipe sleeve 81. Start the second hydraulic push rod 89 to push the circular sealing piston 88 upward, driving the relevant components of the sealing cover 86 to move, so that the bent connecting rod 816 rotates to clamp the press-fit rivet. During this process, the principle of air pressure balance is used, through the connection between the transfer sealing box 91 and the sealing cover 86 and the arc-shaped rubber block 93 and other components to ensure that the clamping force is appropriate and stable;

[0061] Step 2: Grinding. Turn on the first drive motor 629, and drive the built-in rectangular slide 623 to move via the conveyor belt 627 and the linkage shaft 626. When the press rivet is in place, start the grinding motor 62 and the second drive motor 87. The grinding motor 62 drives the grinding disc 65 to rotate, and cooperates with the second drive motor 87 to rotate the press rivet. At the same time, the grinding disc 65 is driven by the first hydraulic push rod 611 and the related mechanical structure to complete the grinding of the position to be welded. After the grinding is completed, the related components are reset.

[0062] Step 3: Spraying. During the movement of the linkage shaft 626, the infrared proximity sensor 74 is driven to move up and down according to its position change. When the press-fit rivet approaches the sensor and enters the close range, the spray gun 73 is triggered to start. The anti-permeability agent in the storage box 75 is sprayed out by the spray gun 73 through the delivery pipe 76 and applied to the polished welding part of the press-fit rivet. When the press-fit rivet leaves, the spray gun 73 stops.

[0063] Step 4: Welding: The conveyor belt 627 continues to rotate to deliver the press-fit rivets to the end of the plasma welding gun 4. The plasma welding gun 4 introduces working gas and applies high voltage to generate plasma. The plasma melts the metal with its high temperature and high energy characteristics, and welds the pre-treated press-fit rivets.

[0064] Step 5: Cutting and welding are completed. The one-way valve 99 allows external air to enter the sealing cover 86, the circular sealing piston 88 is reset, the press-fit rivet is released, and preparation for the next round of processing is made.

[0065] How it works

[0066] Turn on the first drive motor 629. The first drive motor 629 is controlled by an encoder to ensure operation accuracy. Its output shaft drives the conveyor roller 628 to rotate. Since the two conveyor rollers 628 are connected by the conveyor belt 627, the two conveyor rollers 628 rotate synchronously.

[0067] The rotation of the conveyor belt 627 drives the linkage shaft 626 to move synchronously. The linkage shaft 626 is inserted into the built-in longitudinal groove 625 of the built-in rectangular slide 623, driving the built-in rectangular slide 623 to slide in the second rectangular slide groove 631 provided on the upper surface of the workbench 1. At the same time, under the auxiliary guidance of the two transverse optical axes 630, the built-in rectangular slide 623 is ensured to move horizontally and smoothly.

[0068] When the built-in rectangular slide 623 moves to the point where the third magnet 624 and the second magnet 622 fixed on one side of it are in contact with each other, the second tooth plate 617 is driven to move synchronously with the movement of the built-in rectangular slide 623. The second tooth plate 617 engages with the long gear 620, driving the long gear 620 to rotate. The long gear 620 engages with the first tooth plate 616, thereby driving the first tooth plate 616 to move downward. The movement of the first tooth plate 616 drives the connecting plate 612 to move downward, and the connecting plate 612 drives the first rectangular rod sleeve 614 to slide downward on the surface of the first built-in light rod 615, and at the same time drives the first hydraulic push rod 611 to move downward. The movement of the first hydraulic push rod 611 drives the longitudinal slide bar 69 to move downward, so that the longitudinal slide bar 69 and the first rectangular rod sleeve 614 move downward synchronously. At this time, the upper cross bar 66 does not slide inside the first rectangular rod sleeve 614.

[0069] When the press rivet moves to a suitable position and the grinding disc 65 is in contact with the surface of the press rivet to be ground, the linkage shaft 626 moves to the leftmost end. At this time, the first drive motor 629 stops running, and then the grinding motor 62 and the second drive motor 87 are started. The operation of the second drive motor 87 drives the press rivet inside the pipe sleeve 81 to rotate, and the operation of the grinding motor 62 drives the grinding shaft 63 to rotate, and the grinding shaft 63 drives the grinding disc 65 to rotate. The operation of the first hydraulic push rod 611 drives the longitudinal slide bar 69 to slide longitudinally, and then drives the tilting rod 68 to move. The rotation of the grinding disc 65 drives the vertical rod 67 to move through the tilting rod 68, and then the upper cross bar 66 and the lower cross bar 634 slide inside the first rectangular rod sleeve 614, achieving the effect of driving the grinding disc 65 to move. As the press rivet rotates, and the rotating grinding disc 65 moves in contact with the press rivet, the position of the press rivet to be welded is polished;

[0070] Under the action of the first bearing 64, the force between the grinding disc 65 and the press rivet is prevented from damaging the grinding motor 62;

[0071] After the grinding is completed, the first drive motor 629 continues to operate, so that the linkage shaft 626 continues to rotate with the conveyor belt 627. At this time, the linkage shaft 626 slides inside the built-in longitudinal groove 625, so that the linkage shaft 626 moves downward, and the built-in rectangular slide 623 moves in the direction away from the second magnet 622. Since the surfaces of the second magnet 622 and the third magnet 624 are in contact with each other, under the action of the magnetic attraction, the movement of the built-in rectangular slide 623 drives the second tooth plate 617 to move, and then drives the first magnet 618 to move until it is in contact with the surface of the iron pressure plate 619. Under the action of the magnetic attraction, the position of the second tooth plate 617 is fixed. At this time, the second magnet 622 and the third magnet 624 are separated. The movement of the second tooth plate 617 drives the long gear 620 to rotate, and then drives the first tooth plate 616 to move upward, so that the longitudinal slide bar 69 and the first rectangular rod sleeve 614 move upward synchronously, and under the action of the retraction of the telescopic rod of the first hydraulic push rod 611, the grinding disc 65 can be reset.

[0072] The polished rivet provides a clean surface with appropriate roughness for the spray assembly 7, which is conducive to the adhesion of the transmittance enhancer;

[0073] When the linkage shaft 626 moves from right to left, the linkage shaft 626 is in a higher position, which drives the linkage plate 78 to move synchronously. The linkage plate 78 slides on the surface of the rectangular fixed rod 79. During this process, the press rivet is moving because the distance between the press rivet and the infrared proximity sensor 74 is far, and the spray gun 73 does not operate. When the linkage shaft 626 moves from left to right, the linkage shaft 626 is in a lower position, which causes the linkage plate 78 to move downward. The movement of the linkage plate 78 drives the rectangular fixed rod 79 to move downward, and then the second rectangular rod sleeve 71 moves downward. The movement of the second rectangular rod sleeve 71 drives the infrared proximity sensor 74 to move downward. When the built-in rectangular slide 623 drives the press rivet above it to pass under the infrared proximity sensor 74, the infrared proximity sensor 74 detects the approach of an object using the reflection principle of infrared rays. Infrared rays are emitted. When the press-fit rivet approaches, the infrared rays are reflected back. When the sensor receives the reflected light, a signal change is generated. When the press-fit rivet passes within the close range of the infrared proximity sensor 74, the infrared proximity sensor 74 outputs a signal to trigger the spray gun 73 to start. The transmittance enhancer in the storage box 75 is transported to the spray gun 73 through the delivery pipe 76 and sprayed on the position of the press-fit rivet to be welded and polished. When the press-fit rivet leaves this close range, the signal changes and the spray gun 73 is controlled to stop, thereby achieving the effect of spraying the transmittance enhancer on the press-fit rivet. Usually, there is an adjustment screw on the infrared proximity sensor 74. By rotating the screw, the inductance value or magnetic field distribution of the internal coil can be changed, thereby adjusting the detection distance. Rotating the screw clockwise may increase the detection distance, while rotating it counterclockwise may reduce the detection distance, thereby accurately controlling the start timing of the spray gun 73.

[0074] The storage tank 75 is equipped with a small pump device. When the start signal of the spray gun 73 is received, the pump starts to work, extracts the permeability enhancer from the storage tank 75 and presses it into the spray gun 73 through the delivery pipe 76. This pump can be a peristaltic pump, a diaphragm pump, etc., which can accurately control the flow rate of the permeability enhancer to meet different spraying requirements. The spray gun 73 usually has a nozzle. The internal structure of the nozzle is designed to atomize the inflowing permeability enhancer. When the permeability enhancer enters the spray gun 73, it is dispersed into tiny droplets through the special structure of the nozzle, such as a small nozzle hole or an atomizing device with a high-speed airflow.

[0075] As the conveyor belt 627 rotates, the linkage shaft 626 moves synchronously, so that the press-fit rivet moves to the end position of the plasma welding gun 4. The press-fit rivet can be welded by the operation of the plasma welding gun 4, and the welding position is polished and sprayed with a transparent agent in advance to promote the welding effect.

[0076] The plasma welding gun 4 has an electrode, usually a tungsten electrode, and a nozzle. When working, a working gas, usually an inert gas such as argon, is first introduced between the electrode and the nozzle. When a high voltage is applied between the electrode and the workpiece differential press rivet, the gas is ionized. For example, under the action of a high electric field, the outer electrons of argon atoms will break away from the constraints of the atomic nucleus, forming free electrons and positively charged ions. These free electrons, ions and some non-ionized gas atoms together constitute plasma. Plasma has a very high energy density because it is a highly ionized gas state. The ions and electrons therein have very high kinetic energy. In addition, the temperature of plasma is extremely high, reaching tens of thousands of degrees Celsius. This high temperature enables it to easily melt metal materials.

[0077] The work of the spraying component 7 depends on the clean and suitable surface provided by the polishing component 6. Only on such a surface can the transmittance enhancer better adhere to and play its role;

[0078] Before polishing the workpiece and spraying the anti-permeability agent, the press-fit rivet is placed between the two rubber clamping jaws 815, and the press-fit rivet is in contact with the top of the pipe sleeve 81. By starting the second hydraulic push rod 89, the operation of the second hydraulic push rod 89 drives the circular sealing piston 88 to move upward, so that the gas above the sealing cover 86 is squeezed, thereby driving the sealing cover 86 to move. The movement of the sealing cover 86 drives the rectangular shell 812 to move through the middle connecting rod 810, and then drives the two bent connecting rods 816 to rotate inside the mounting groove 820 through the auxiliary rotating shaft 814, thereby achieving the effect of clamping the press-fit rivet. The setting of the spring 818 can make the two bent connecting rods 816 automatically open after the processing of the press-fit rivet is completed, thereby releasing the clamping limit of the press-fit rivet;

[0079] In the process of clamping the press rivet, the circular sealing piston 88 continues to move upward as the second hydraulic push rod 89 operates. When the force of the two rubber clamping claws 815 on the press rivet is appropriate, the air pressure inside the sealing cover 86 continues to increase as the circular sealing piston 88 moves upward. Since the transfer sealing box 91 and the sealing cover 86 are connected under the action of the U-shaped pipe 97, the air pressure inside the transfer sealing box 91 and the sealing cover 86 is the same. When the air pressure inside the sealing cover 86 increases, the transfer sealing box 91 The air pressure applied to the arc-shaped rubber block 93 is continuously increased. When the air pressure reaches a certain value, the gas inside the transfer sealing box 91 flows out along the gap between the arc-shaped rubber block 93 and the exhaust hole 92, so that the air pressure inside the sealing cover 86 reaches a certain range and is in a balanced state. After the telescopic rod of the second hydraulic push rod 89 is extended to the maximum distance, the circular sealing piston 88 is in a stationary state, thereby achieving the clamping of the press-fit rivet and preventing the press-fit rivet from being damaged by a strong clamping force.

[0080] The setting of the one-way valve 99 allows external air to flow into the interior of the sealing cover 86 after the clamping of the press rivet is released, thereby resetting the position of the circular sealing piston 88 and facilitating the clamping of the next press rivet again.

[0081] Through the above series of precise and coordinated operation steps, the welding position of the press rivet is first polished and sprayed with a transparent agent before welding, which effectively improves the plasma welding effect of the press rivet for the differential, ensures the welding quality, and meets the high-performance manufacturing requirements of the differential.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A plasma welding device for press-fit rivets for differentials, characterized in that: The invention comprises a workbench (1), wherein the upper surface of the workbench (1) is fixedly connected to a welding support rod (3), an L-shaped mounting block (5) is provided on one side of the welding support rod (3), a plasma welding gun (4) is installed on one end of the L-shaped mounting block (5), and two support plates (2) are fixedly connected to the bottom surface of the workbench (1); a grinding assembly (6) is provided on the surface of the workbench (1), and the grinding assembly (6) comprises a grinding disc (65) provided above the workbench (1) and a grinding electrode for grinding the press-fit rivet by means of the grinding disc (65). The machine (62), the upper cross bar (66), the vertical bar (67), the tilting bar (68), the longitudinal slide bar (69), the hollow bar (610), the first hydraulic push rod (611), the connecting plate (612), the lower cross bar (634), the linkage shaft (626), the conveyor belt (627), the conveyor roller (628), the first drive motor (629) and the built-in rectangular slide (623); the workbench (1) is provided with a spraying assembly (7), the spraying assembly (7) includes a spray gun (73) provided above the workbench (1) and a spray gun for spraying the workbench (1) through the spray gun. (73) a second rectangular rod sleeve (71) for spraying a permeability enhancer on the press-fit rivet, a rectangular connecting rod (72), an infrared proximity sensor (74), a storage box (75), a delivery pipe (76), a linkage plate (78) and a rectangular fixing rod (79); a clamping assembly (8) is provided on the surface of the built-in rectangular slide (623), and the clamping assembly (8) includes a pipe sleeve (81) provided above the built-in rectangular slide (623) and two bent connecting rods (816) symmetrically provided inside the pipe sleeve (81) and a clamping assembly (816) provided through the two bent connecting rods (816) A sealing cover (86) for clamping the press-fit rivet, a circular sealing piston (88), a second hydraulic push rod (89), a rectangular housing (812), an auxiliary rotating shaft (814), and a built-in square rod (817); a pressure stabilizing assembly (9) is provided on the surface of the sealing cover (86), and the pressure stabilizing assembly (9) includes a transfer sealing box (91) provided on the surface of the sealing cover (86), an arc-shaped rubber block (93) for adjusting the appropriate clamping force of the press-fit rivet, an upper connecting rod (96), a positioning ring (98), a one-way valve (99), and a counterweight ring (910); The upper surface of the workbench (1) is fixedly connected to a hollow rod (610), a longitudinal slide rod (69) is inserted into a first rectangular slide groove (613) opened on the upper surface of the hollow rod (610), the longitudinal slide rod (69) and the hollow rod (610) are slidably connected, and a side of the vertical rod (67) away from the lower cross bar (634) is fixedly connected to two side baffles (633), a tilting rod (68) is inserted between the two side baffles (633), the other end of the tilting rod (68) is inserted into a groove opened at the top of the longitudinal slide rod (69), and the two ends of the tilting rod (68) are respectively connected to the side baffles by axle pins. (633) and the longitudinal slide bar (69) are rotatably connected, a connecting plate (612) is inserted into the interior of the hollow rod (610), one end of the connecting plate (612) is fixedly connected to the first rectangular rod sleeve (614), the connecting plate (612) and the hollow rod (610) are slidably connected, a first hydraulic push rod (611) is installed on the upper surface of the connecting plate (612), the top end of the telescopic rod of the first hydraulic push rod (611) is fixedly connected to the bottom end of the longitudinal slide bar (69), a first tooth plate (616) is inserted into the fourth rectangular slide groove (635) opened on the upper surface of the workbench (1), the first tooth plate (616) is fixedly connected to the first rectangular rod sleeve (614), and the first tooth plate (616) is fixedly connected to the first rectangular rod sleeve (614). 16) is slidably connected to the workbench (1), the top of the first tooth plate (616) is fixedly connected to the connecting plate (612), the interior of the workbench (1) is provided with a third rectangular chute (632) which is connected to the interior of the second rectangular chute (631), the interior of the third rectangular chute (632) is provided with a long gear (620) and a second tooth plate (617), the long gear (620) and the second tooth plate (617) are meshed and connected, the upper surface of the second tooth plate (617) is in contact with the inner wall of the third rectangular chute (632), and the interior of the long gear (620) is provided with a built-in rotating shaft (621), The two ends of the built-in rotating shaft (621) are fixedly connected to the workbench (1), the long gear (620) and the built-in rotating shaft (621) are rotatably connected, the long gear (620) and the first tooth plate (616) are meshedly connected, the two ends of the second tooth plate (617) are respectively fixedly connected to the first magnet (618) and the second magnet (622), the side of the built-in rectangular slide (623) close to the second magnet (622) is fixedly connected to the third magnet (624), the interior of the third rectangular slide (632) is provided with an iron pressure plate (619), and the iron pressure plate (619) is fixedly connected to the workbench (1).

2. The plasma welding device for press-fit rivets for differential according to claim 1, characterized in that: A built-in rectangular slide (623) is inserted into the second rectangular chute (631) opened on the upper surface of the workbench (1), and the built-in rectangular slide (623) is slidably connected to the workbench (1). Two conveying rollers (628) are provided inside the second rectangular chute (631), and the surfaces of the two conveying rollers (628) are covered with a conveyor belt (627). The two conveying rollers (628) are connected by transmission through the conveyor belt (627), and the rotating shafts of the two conveying rollers (628) are respectively inserted into the two rotating holes opened on the front surface of the workbench (1). The conveying roller (628) and the workbench (1) are rotatably connected, a first driving motor (629) is installed on the front surface of the workbench (1), the output shaft of the first driving motor (629) is fixedly connected to the end of the rotating shaft of one of the conveying rollers (628), a linkage shaft (626) is inserted into the built-in longitudinal groove (625) opened inside the built-in rectangular slide (623), the linkage shaft (626) and the built-in rectangular slide (623) are slidably connected, and one end of the linkage shaft (626) is fixedly connected to one side of the conveyor belt (627).

3. The plasma welding device for press-fit rivets for differential according to claim 2, characterized in that: The upper surface of the workbench (1) is fixedly connected to a first built-in polished rod (615), the surface of the first built-in polished rod (615) is sleeved with a first rectangular rod sleeve (614), the first rectangular rod sleeve (614) and the first built-in polished rod (615) are slidably connected, the top of the first rectangular rod sleeve (614) is fixedly connected to a counterweight (61), and an upper cross bar (66) and a lower cross bar (634) are respectively inserted into two transverse grooves opened on the surface of the first rectangular rod sleeve (614), the upper cross bar (66) is located above the lower cross bar (634), and the upper cross bar (66) and the lower cross bar (634) are both connected to the first rectangular rod. The sleeve (614) is slidably connected, the upper cross bar (66) and the lower cross bar (634) are both fixedly connected to one side of the vertical bar (67), the bottom surface of the upper cross bar (66) is fixedly connected to the grinding motor (62), the end of the output shaft of the grinding motor (62) is fixedly connected to the grinding shaft (63), the bottom end of the grinding shaft (63) is fixedly connected to the grinding disk (65), the surface of the grinding shaft (63) is sleeved with a first bearing (64), the first bearing (64) is installed in a through groove opened on the surface of the lower cross bar (634), and the grinding shaft (63) is rotatably connected to the lower cross bar (634) through the first bearing (64).

4. The plasma welding device for press-fit rivets for a differential according to claim 3, characterized in that: One side of the built-in rectangular slide (623) is fixedly connected to two transverse optical axes (630), the two transverse optical axes (630) respectively pass through one side of the workbench (1) transversely, and the transverse optical axes (630) and the workbench (1) are slidably connected.

5. The plasma welding device for press-fit rivets for differential according to claim 4, characterized in that: A linkage plate (78) is provided inside the second rectangular chute (631), a built-in partition plate (710) is provided between the linkage plate (78) and the built-in rectangular slide plate (623), the built-in partition plate (710) is fixedly connected to the workbench (1), the linkage plate (78) and the workbench (1) are slidably connected, the end of the linkage shaft (626) away from the conveyor belt (627) is inserted into a through hole opened on the surface of the linkage plate (78), the linkage shaft (626) and the linkage plate (78) are slidably connected, a rectangular fixing rod (79) is inserted into a first embedded groove (711) opened on a side of the linkage plate (78) away from the built-in partition plate (710), the rectangular fixing rod (79) and the linkage plate (78) are slidably connected, the rectangular fixing rod (79) away from the linkage plate (7 8) is fixedly connected to one side of the workbench (1), a second rectangular rod sleeve (71) is inserted into the interior of the second rectangular rod sleeve (71), the second built-in light rod (77) and the second rectangular rod sleeve (71) are slidably connected, the bottom end of the second built-in light rod (77) is fixedly connected to the workbench (1), the top end of the second rectangular rod sleeve (71) is fixedly connected to a rectangular connecting rod (72), a spray gun (73) is installed in a longitudinal hole opened on the upper surface of the rectangular connecting rod (72), an infrared proximity sensor (74) is installed on the bottom surface of the rectangular connecting rod (72), a storage box (75) is installed on the upper surface of the workbench (1), a delivery pipe (76) is inserted into the upper surface of the storage box (75), and the other end of the delivery pipe (76) is inserted into the feed end of the spray gun (73).

6. The plasma welding device for press-fit rivets for a differential according to claim 5, characterized in that: A pipe sleeve (81) is provided above the built-in rectangular slide (623), the bottom end of the pipe sleeve (81) is fixedly connected to a bottom disc (82), the bottom surface of the bottom disc (82) is fixedly connected to a built-in disc (822), the circumferential surface of the built-in disc (822) is sleeved with a second bearing (823), the surface of the outer ring of the second bearing (823) is fixedly connected to four L-shaped support rods (83), the bottom end of the L-shaped support rod (83) is fixedly connected to the built-in rectangular slide (623), the built-in disc (822) is rotatably connected to the second bearing (823) and the L-shaped support rod (83), the upper surface of the built-in rectangular slide (623) is mounted with a second drive motor (87), and the end of the output shaft of the second drive motor (87) is fixedly connected to the bottom surface of the built-in disc (822).

7. The plasma welding device for press-fit rivets for a differential according to claim 6, characterized in that: The interior of the pipe sleeve (81) is provided with an internal square rod (817), the surface of the internal square rod (817) is provided with a square frame plate (819) and a rectangular shell (812), the square frame plate (819) and the internal square rod (817) are fixedly connected, the rectangular shell (812) and the internal square rod (817) are slidably connected, the square frame plate (819) is slidably connected inside the rectangular shell (812), the surface of the internal square rod (817) is provided with a spring (818), the two ends of the spring (818) are respectively connected to the square frame plate (819) and the rectangular shell. The rectangular housing (812) is fixedly connected to the housing, and two symmetrically arranged bending connecting rods (816) are inserted into the mounting groove (820) opened at the top of the built-in square rod (817). The two bending connecting rods (816) are rotatably connected to the built-in square rod (817) through a pin shaft. Auxiliary rotating shafts (814) are respectively inserted into the arc-shaped through grooves (821) opened inside the two bending connecting rods (816). The two auxiliary rotating shafts (814) are respectively located in the second embedded grooves (813) opened on the upper surface of the rectangular housing (812). The auxiliary rotating shafts (814) and the bending connecting rods (816) are respectively connected to the second embedded grooves (813) opened on the upper surface of the rectangular housing (812). 16) movable connection, the adjacent sides of the top of the two bending connecting rods (816) are respectively fixedly connected with rubber clamping claws (815), the bottom end of the built-in square rod (817) is fixedly connected with four circular fixed rods (811) in a ring array, and the end of the circular fixed rod (811) away from the built-in square rod (817) is fixedly connected to the pipe sleeve (81), and a sealing cover (86) is provided below the rectangular shell (812), and two middle connecting rods (810) are fixedly connected between the sealing cover (86) and the rectangular shell (812), and the inner of the sealing cover (86) is fixedly connected to the inner of the sealing cover (86). A circular sealing piston (88) is inserted into the bottom, and the circular sealing piston (88) and the sealing cover (86) are sealed and slidably connected. A second hydraulic push rod (89) is installed on the upper surface of the bottom disc (82), and the end of the telescopic rod of the second hydraulic push rod (89) is fixedly connected to the circular sealing piston (88). Auxiliary slides (85) are respectively inserted into the two auxiliary sliding grooves (84) opened inside the pipe sleeve (81), and the auxiliary slides (85) and the pipe sleeve (81) are slidably connected. The adjacent ends of the two auxiliary slides (85) are respectively fixedly connected to the sealing cover (86).

8. The plasma welding device for press-fit rivets for differential according to claim 7, characterized in that: A one-way valve (99) is installed in the air hole opened on the upper surface of the sealing cover (86), the circumferential surface of the sealing cover (86) is fixedly connected to a transfer sealing box (91), the upper surface of the transfer sealing box (91) is fixedly connected to a limit cover (94) with air holes, a limit tube (95) is longitudinally inserted into the upper surface of the limit cover (94) with air holes, the limit tube (95) and the limit cover (94) with air holes are fixedly connected, an upper connecting rod (96) is inserted into the interior of the limit tube (95), the upper connecting rod (96) and the limit tube (95) are slidably connected, the bottom end of the upper connecting rod (96) is fixedly connected to an arc-shaped rubber block (93), and the surface of the upper connecting rod (96) is sleeved with a positioning ring (98 ) and a counterweight ring (910), the positioning ring (98) is located above the limiting tube (95), the counterweight ring (910) is located above the positioning ring (98), the positioning ring (98) and the upper connecting rod (96) are fixedly connected, the counterweight ring (910) and the upper connecting rod (96) are slidably connected, the surface of the arc-shaped rubber block (93) is in contact with the groove wall of the exhaust hole (92) on the upper surface of the transfer sealing box (91), a U-shaped pipe (97) is inserted into the upper surface of the transfer sealing box (91), and one end of the U-shaped pipe (97) away from the transfer sealing box (91) is inserted into the upper surface of the sealing cover (86), and the transfer sealing box (91) is connected to the inside of the sealing cover (86) through the U-shaped pipe (97).

9. The welding process of the plasma welding device for press-fit rivets for differential according to claim 8, characterized in that: The following steps are involved: Step 1: Loading and clamping: Place the press-fit rivet between the two rubber clamping jaws (815) so that it fits the top of the pipe sleeve (81). Start the second hydraulic push rod (89) to push the circular sealing piston (88) upward, driving the relevant parts of the sealing cover (86) to move, so that the bending connecting rod (816) rotates to clamp the press-fit rivet. During the process, the principle of air pressure balance is used to ensure that the clamping force is appropriate and stable through the connection between the transfer sealing box (91) and the sealing cover (86) and the arc-shaped rubber block (93); Step 2: grinding. Turn on the first drive motor (629), and drive the built-in rectangular slide (623) to move via the conveyor belt (627) and the linkage shaft (626). When the press-fit rivet is in place, start the grinding motor (62) and the second drive motor (87). The grinding motor (62) drives the grinding disc (65) to rotate, and cooperates with the second drive motor (87) to rotate the press-fit rivet. At the same time, the grinding disc (65) is driven to move by the first hydraulic push rod (611) and the related mechanical structure to complete the grinding of the position to be welded. After the grinding is completed, the related components are reset. Step 3: Spraying. During the movement of the linkage shaft (626), the infrared proximity sensor (74) is driven to move up and down according to its position change. When the press-fit rivet approaches the sensor and enters the close range, the spray gun (73) is triggered to start. The permeability enhancer in the storage box (75) is sprayed out by the spray gun (73) through the delivery pipe (76) and applied to the polished press-fit rivet welding part. When the press-fit rivet leaves, the spray gun (73) stops. Step 4: Welding: The conveyor belt (627) continues to rotate to deliver the press-fit rivets to the end of the plasma welding gun (4). The plasma welding gun (4) is fed with working gas and a high voltage is applied to generate plasma. The plasma melts the metal by virtue of its high temperature and high energy characteristics, and the pre-treated press-fit rivets are welded; Step 5: Cutting and welding are completed. The one-way valve (99) allows external air to enter the sealing cover (86). The circular sealing piston (88) is reset, and the press-fit rivet is released to prepare for the next round of processing.

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