An upper electrode structure for projection welding of the side wall of a U-shaped part

Abstract

The present invention discloses an upper electrode structure for projection welding of the side wall of a U-shaped part, which relates to the technical field of welding equipment. It includes an upper electrode base. Multiple T-shaped grooves are provided on the top surface of the upper electrode base. An electrode arm is provided on the bottom surface of the upper electrode base. A plurality of cooling water joints are provided on one side of the electrode arm. An overseat is provided at one end of the bottom surface of the electrode arm. An upper electrode head is provided at the lower end of the overseat. A passive strengthening mechanism is provided on the bottom surface of the upper electrode base. The execution end of the passive strengthening mechanism abuts against the top surface of one end of the electrode arm. Compared with the original L-shaped special-shaped upper electrode, the horn-shaped electrode arm has a large eccentric displacement and a relatively uniform output pressure. With the assistance of the passive strengthening mechanism, the types of welded products are increased, and at the same time, the strength of projection welding is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of welding equipment, and particularly to an upper electrode structure for projection welding of the side wall of a U-shaped part. Background Art

[0002] At present, the projection welding process has been widely applied in many parts enterprises and vehicle manufacturers. Therefore, the design and manufacture of welding electrodes are the key issues affecting the good application of the projection welding process. For the projection welding of the side wall of an automotive U-shaped part, most enterprises generally use an L-shaped upper electrode arm for welding at present. In the actual welding process, since the stress point of the L-shaped welding arm and the eccentric contact point are on the same plane, when the pressure applied by the upper electrode during the welding process is greater than 0.20 MPa, the pressure cannot be evenly applied to the nut stress surface (the pressure is large near the stress point and small far from the stress point), and finally the welding strength of the projection welding standard parts cannot meet the technical requirements, and it is easy to cause false welding and welding slag. Summary of the Invention

[0003] Based on this, the purpose of the present invention is to provide an upper electrode structure for projection welding of the side wall of a U-shaped part, so as to solve the technical problem that the pressure applied by the upper electrode cannot be evenly applied to the nut stress surface during the welding process, resulting in the welding strength not meeting the technical requirements as mentioned in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: an upper electrode structure for projection welding of the side wall of a U-shaped part, including an upper electrode seat. The top surface of the upper electrode seat is provided with a plurality of T-shaped groove fixing nuts. The bottom surface of the upper electrode seat is provided with an electrode arm. One side of the electrode arm is provided with a plurality of cooling water joints. One end of the bottom surface of the electrode arm is provided with an over seat. An upper electrode head is provided at the lower end of the over seat. The bottom surface of the upper electrode seat is provided with a passive strengthening mechanism, and the execution end of the passive strengthening mechanism abuts against the top surface of one end of the electrode arm.

[0005] Further, the electrode arm is arranged in a horn shape.

[0006] Further, a cooling water channel is opened inside the electrode arm, and an over mounting hole is opened at one end of the bottom surface of the electrode arm.

[0007] Further, the electrode arm, the over seat and the upper electrode head are all threadedly connected, which is convenient for quick replacement.

[0008] Further, the passive strengthening mechanism includes a plurality of fixed strengthening seats, and the plurality of fixed strengthening seats are respectively arranged on both sides of the bottom surface of the upper electrode seat. One ends of the upper parts of the plurality of fixed strengthening seats are respectively rotatably connected to the upper ends of the strengthening curved arms. The middle parts of the plurality of strengthening curved arms are respectively slidably connected to the middle parts of the downward pressing sliders. The upper parts of the plurality of downward pressing sliders are respectively rotatably connected to the lower ends of the downward pressing connecting rods. The upper ends of the plurality of downward pressing connecting rods are respectively rotatably connected to the other ends of the upper parts of the plurality of fixed strengthening seats. The lower ends of the plurality of strengthening curved arms are all rotatably connected to the middle part of the movable strengthening block. Both ends of the movable strengthening block are respectively rotatably connected to the lower ends of a plurality of movable connecting rods. The upper ends of the plurality of movable connecting rods are respectively rotatably connected to the other ends of the upper parts of the plurality of fixed strengthening seats. One ends of the plurality of fixed strengthening seats are respectively arranged at one ends of the tension springs. The other ends of the plurality of tension springs are respectively arranged at the lower parts of the plurality of downward pressing sliders.

[0009] Further, the plurality of fixed strengthening seats and the movable strengthening block are both made of high-strength insulating materials.

[0010] Further, the fixed strengthening seat includes a strengthening seat fixing plate. The top surface of the strengthening seat fixing plate is arranged on one side of the bottom surface of the upper electrode seat. One end of the bottom surface of the strengthening seat fixing plate is provided with a fixing column. The upper end of the fixing column is provided with a fixed rear rotating shaft. The fixed rear rotating shaft is rotatably connected to the upper end of the strengthening curved arm. The lower end of the fixing column is arranged at one end of the tension spring. Both sides of the lower end of the fixing column are respectively provided with fixed diagonal braces. The upper ends of the plurality of fixed diagonal braces are all arranged at the other end of the bottom surface of the strengthening seat fixing plate. The other end of the bottom surface of the strengthening seat fixing plate is provided with a fixed front rotating shaft. The middle part of the fixed front rotating shaft is rotatably connected to the upper end of the downward pressing connecting rod, and its two ends are respectively rotatably connected to the upper ends of the plurality of movable connecting rods.

[0011] Further, sliding limit blocks are symmetrically arranged on both sides of the middle part of the strengthening curved arm, and the plurality of sliding limit blocks all abut against one end of the downward pressing slider.

[0012] Further, the downward pressing slider includes a sliding sleeve. The sliding sleeve is slidably connected to the middle part of the strengthening curved arm. Limiting card slots are respectively opened on both sides of one end of the sliding sleeve. The plurality of limiting card slots respectively abut against both sides of the middle part of the strengthening curved arm. A downward pressing sliding shaft is arranged on the upper part of the sliding sleeve. The downward pressing sliding shaft is rotatably connected to the lower end of the downward pressing connecting rod. One end of the bottom surface of the sliding sleeve is arranged at one end of the tension spring.

[0013] Further, the movable reinforcing block is arranged in a U shape. A movable front rotating shaft is provided on the top surface of the middle part of the movable reinforcing block. The movable front rotating shaft is rotatably connected to the lower ends of the plurality of reinforcing curved arms. Movable rear rotating shafts are respectively provided on the top surfaces of both ends of the movable reinforcing block. The plurality of movable rear rotating shafts are respectively rotatably connected to the lower ends of the plurality of movable connecting rods. A downward pressing convex block is provided on the bottom surface of the middle part of the movable reinforcing block. The bottom surface of the downward pressing convex block abuts against the top surface of a section of the electrode arm.

[0014] In summary, the present invention mainly has the following beneficial effects:

[0015] Compared with the original L-shaped special-shaped upper electrode, the horn-shaped electrode arm has a large eccentric displacement (the L-shaped eccentricity is: 50 mm, and the horn electrode eccentricity is: 130 mm), the output pressure is relatively uniform (the pressure value is above 0.2 MPa), and with the assistance of the passive strengthening mechanism, the types of welded products are increased (U-shaped parts, etc.), and at the same time, the strength of projection welding is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the external structure of the present invention Figure 1 ;

[0017] Figure 2 is a schematic diagram of the external structure of the present invention Figure 2 ;

[0018] Figure 3 is a schematic diagram of the structure of the electrode arm of the present invention;

[0019] Figure 4 is a sectional view of the structure of the electrode arm of the present invention;

[0020] Figure 5 is a schematic diagram of the structure of the passive strengthening mechanism of the present invention;

[0021] Figure 6 is a disassembled schematic diagram of the structure of the passive strengthening mechanism of the present invention;

[0022] Figure 7 is a schematic diagram of the structure of the fixed strengthening seat of the present invention;

[0023] Figure 8 is a schematic diagram of the structure of the reinforcing curved arm of the present invention;

[0024] Figure 9 is a schematic diagram of the structure of the downward pressing slider of the present invention;

[0025] Figure 10 is a schematic diagram of the structure of the movable reinforcing block of the present invention.

[0026] Description of the drawings: 1. Upper electrode seat; 2. T-slot fixing nut; 3. Electrode arm; 31. Cooling water channel; 32. Over-mounting hole; 4. Cooling water joint; 5. Over-seat; 6. Upper electrode head; 7. Passive strengthening mechanism; 71. Fixed strengthening seat; 711. Strengthening seat fixing plate; 712. Fixed column; 713. Fixed rear rotating shaft; 714. Fixed diagonal brace; 715. Fixed front rotating shaft; 72. Strengthening curved arm; 721. Sliding limit block; 73. Pressing slider; 731. Sliding sleeve; 732. Limit card slot; 733. Pressing sliding shaft; 74. Pressing connecting rod; 75. Movable strengthening block; 751. Movable front rotating shaft; 752. Movable rear rotating shaft; 753. Pressing convex block; 76. Movable connecting rod; 77. Tensile spring. Embodiment

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as a limitation of the present invention.

[0028] Next, the embodiments of the present invention will be described according to the overall structure of the present invention.

[0029] For the embodiment, please refer with emphasis to Figure 1-2 , an upper electrode structure for projection welding of the side wall of a U-shaped part, including an upper electrode seat 1, a plurality of T-slot fixing nuts 2 are provided on the top surface of the upper electrode seat 1, an electrode arm 3 is provided on the bottom surface of the upper electrode seat 1, a plurality of cooling water joints 4 are provided on one side of the electrode arm 3, an over-seat 5 is provided at one end of the bottom surface of the electrode arm 3, an upper electrode head 6 is provided at the lower end of the over-seat 5, a passive strengthening mechanism 7 is provided on the bottom surface of the upper electrode seat 1, and the execution end of the passive strengthening mechanism 7 abuts against the top surface of one end of the electrode arm 3.

[0030] For the embodiment, please refer with emphasis to Figure 3-4 , the electrode arm 3 is arranged in a horn shape. This design replaces the L-shaped electrode arm with a horn-shaped electrode arm 3, so that the pressure during the downward pressing of the upper electrode is gradually transmitted to the eccentric contact surface through the horn electrode, reducing the uneven force on the contact surface caused by excessive eccentricity in the same plane.

[0031] A cooling water channel 31 is opened inside the electrode arm 3, an over-mounting hole 32 is opened at one end of the bottom surface of the electrode arm 3, the electrode arm 3, the over-seat 5 and the upper electrode head 6 are all connected by threads, and the upper electrode head 6 is a vulnerable part and a quick-change part. Using threads for connection facilitates quick replacement.

[0032] For the embodiment, please refer with emphasis to Figure 5-6, the passive strengthening mechanism 7 includes a plurality of fixed strengthening seats 71. The plurality of fixed strengthening seats 71 are respectively arranged on both sides of the bottom surface of the upper electrode seat 1. One ends of the upper parts of the plurality of fixed strengthening seats 71 are respectively rotatably connected to the upper ends of the strengthening curved arms 72. The middle parts of the plurality of strengthening curved arms 72 are respectively slidably connected to the middle parts of the downward pressing sliders 73. The upper parts of the plurality of downward pressing sliders 73 are respectively rotatably connected to the lower ends of the downward pressing connecting rods 74. The upper ends of the plurality of downward pressing connecting rods 74 are respectively rotatably connected to the other ends of the upper parts of the plurality of fixed strengthening seats 71. The lower ends of the plurality of strengthening curved arms 72 are all rotatably connected to the middle part of the movable strengthening block 75. Both ends of the movable strengthening block 75 are respectively rotatably connected to the lower ends of a plurality of movable connecting rods 76. The upper ends of the plurality of movable connecting rods 76 are respectively rotatably connected to the other ends of the upper parts of the plurality of fixed strengthening seats 71. One ends of a plurality of tension springs 77 are respectively arranged on the lower parts of the plurality of fixed strengthening seats 71. The other ends of the plurality of tension springs 77 are respectively arranged on the lower parts of the plurality of downward pressing sliders 73. The plurality of fixed strengthening seats 71 and the movable strengthening block 75 are all made of high-strength insulating materials. This design presses against the top surface of the execution end of the electrode arm 3 through the middle part of the movable strengthening block 75. When the execution end of the electrode arm 3 is deformed upward under pressure, it drives the middle part of the movable strengthening block 75 to move upward, and then drives the two strengthening curved arms 72 and the four movable connecting rods 76 to flip. Furthermore, the downward pressing slider 73 slides downward to the lower end of the strengthening curved arm 72 under the restriction of the downward pressing connecting rod 74. However, under the action of the tension spring 77, the downward pressing slider 73 cannot slide, so that the downward pressing connecting rod 74 presses the strengthening curved arm 72 downward to offset the upward force received by the execution end of the electrode arm 3.

[0033] Please refer to Figure 7 , the fixed strengthening seat 71 includes a strengthening seat fixing plate 711. The top surface of the strengthening seat fixing plate 711 is arranged on one side of the bottom surface of the upper electrode seat 1. One end of the bottom surface of the strengthening seat fixing plate 711 is provided with a fixing column 712. The upper end of the fixing column 712 is provided with a fixed rear rotating shaft 713. The fixed rear rotating shaft 713 is rotatably connected to the upper end of the strengthening curved arm 72. The lower end of the fixing column 712 is arranged at one end of the tension spring 77. Both sides of the lower end of the fixing column 712 are respectively provided with fixed diagonal braces 714. The upper ends of the plurality of fixed diagonal braces 714 are all arranged at the other end of the bottom surface of the strengthening seat fixing plate 711. The other end of the bottom surface of the strengthening seat fixing plate 711 is provided with a fixed front rotating shaft 715. The middle part of the fixed front rotating shaft 715 is rotatably connected to the upper end of the downward pressing connecting rod 74, and its two ends are respectively rotatably connected to the upper ends of the plurality of movable connecting rods 76. This design further strengthens the structural strength of the fixed strengthening seat 71 through the fixed diagonal braces 714.

[0034] Please refer to Figure 8, symmetrically arranged on both sides of the middle part of the reinforcing bent arm 72 are sliding limit blocks 721, and one end of the pressing slider 73 abuts against each of the multiple sliding limit blocks 721. This design restricts the starting position of the pressing slider 73 through the multiple sliding limit blocks 721, ensuring that the passive strengthening mechanism 7 does not generate resistance when the electrode arm 3 is not under force.

[0035] Please refer specifically to Figure 9 , the pressing slider 73 includes a sliding sleeve 731 which is slidably connected to the middle part of the reinforcing bent arm 72. On both sides of one end of the sliding sleeve 731 are respectively provided limiting card slots 732, and both sides of the middle part of the reinforcing bent arm 72 respectively abut against the multiple limiting card slots 732. Arranged on the upper part of the sliding sleeve 731 is a pressing sliding shaft 733 which is rotatably connected to the lower end of the pressing connecting rod 74. One end of the tension spring 77 is arranged on the bottom surface of the sliding sleeve 731.

[0036] Please refer specifically to Figure 10 , the movable strengthening block 75 is arranged in a U shape. Arranged on the top surface of the middle part of the movable strengthening block 75 is a movable front rotating shaft 751 which is rotatably connected to the lower ends of the multiple reinforcing bent arms 72. Arranged on the top surfaces of both ends of the movable strengthening block 75 are respectively movable rear rotating shafts 752, and the lower ends of the multiple movable connecting rods 76 are respectively rotatably connected to the multiple movable rear rotating shafts 752. Arranged on the bottom surface of the middle part of the movable strengthening block 75 is a pressing convex block 753, and the bottom surface of the pressing convex block 753 abuts against the top surface of a section of the electrode arm 3. This design makes the reaction of the passive strengthening mechanism 7 more sensitive through the arrangement of the pressing convex block 753.

[0037] The working principle of the present invention is as follows:

[0038] First, the upper electrode base 1, multiple cooling water connectors 4, the transition base 5, and the upper electrode head 6 are assembled into the upper electrode assembly on the electrode arm 3, and are fixedly installed on the mounting seat of the projection welder through multiple T-slot fixing nuts 2. Multiple cooling water connectors 4 are connected to the cooling circulating water. The lower electrode is adjusted according to the eccentricity to align the axes of the lower electrode head and the upper electrode head, and is installed in the lower mounting seat of the projection welder. When welding, first place the U-shaped metal workpiece with welding process holes on the lower electrode, then place the welding nut on the positioning pin of the lower electrode, and then start welding. The upper electrode assembly moves downward to close the upper and lower electrode heads, and then power is applied to melt the convex welding point of the welding nut and the U-shaped metal workpiece to complete the welding. During the projection welding process, the horn-shaped electrode arm 3 is used to replace the L-shaped electrode arm, so that the pressure during the downward pressing of the upper electrode is gradually transmitted to the eccentric contact surface through the horn electrode, reducing the uneven force on the contact surface caused by the excessive eccentricity on the same plane. At the same time, the passive strengthening mechanism 7 presses against the top surface of the execution end of the electrode arm 3 through the middle of the movable strengthening block 75. When the execution end of the electrode arm 3 deforms upward under pressure, it drives the middle of the movable strengthening block 75 to move upward, and then drives the two strengthening curved arms 72 and the four movable connecting rods 76 to flip. Furthermore, the pressing slider 73 slides downward to the lower end of the strengthening curved arm 72 under the restriction of the pressing connecting rod 74, but under the action of the tension spring 77, the pressing slider 73 cannot slide, so that the pressing connecting rod 74 presses the strengthening curved arm 72 downward to offset the upward force received by the execution end of the electrode arm 3, further increasing the upper limit of the bearing capacity of the electrode head. The set value of the electrode pressure is much larger than the set range of the ordinary L-shaped special-shaped electrode arm.

[0039] Although the embodiments of the present invention have been shown and described, the specific embodiments are only explanations of the present invention and are not limitations to the invention. The specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art can make modifications, substitutions, and variations that do not contribute creatively to the embodiments according to needs, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. An upper electrode structure for projection welding on the side wall of a U-shaped part, comprising an upper electrode base (1), and a plurality of T-slot fixing nuts (2) are arranged on the top surface of the upper electrode base (1), and it is characterized in that: The bottom surface of the upper electrode seat (1) is provided with an electrode arm (3). One side of the electrode arm (3) is provided with a plurality of cooling water joints (4). One end of the bottom surface of the electrode arm (3) is provided with a transition seat (5). The lower end of the transition seat (5) is provided with an upper electrode head (6). The bottom surface of the upper electrode seat (1) is provided with a passive strengthening mechanism (7). The execution end of the passive strengthening mechanism (7) abuts against the top surface of one end of the electrode arm (3). The passive strengthening mechanism (7) includes a plurality of fixed strengthening seats (71). The plurality of fixed strengthening seats (71) are respectively arranged on both sides of the bottom surface of the upper electrode seat (1). One end of the upper part of the plurality of fixed strengthening seats (71) is respectively rotatably connected to the upper end of a strengthening curved arm (72). The middle parts of the plurality of strengthening curved arms (72) are respectively slidably connected to the middle parts of downward pressing sliders (73). The upper parts of the plurality of downward pressing sliders (73) are respectively rotatably connected to the lower ends of downward pressing connecting rods (74). The upper ends of the plurality of downward pressing connecting rods (74) are respectively rotatably connected to the other ends of the upper parts of the plurality of fixed strengthening seats (71). The lower ends of the plurality of strengthening curved arms (72) are all rotatably connected to the middle part of a movable strengthening block (75). Both ends of the movable strengthening block (75) are respectively rotatably connected to the lower ends of a plurality of movable connecting rods (76). The upper ends of the plurality of movable connecting rods (76) are respectively rotatably connected to the other ends of the upper parts of the plurality of fixed strengthening seats (71). One ends of a plurality of tension springs (77) are respectively arranged on the lower parts of the plurality of fixed strengthening seats (71). The other ends of the plurality of tension springs (77) are respectively arranged on the lower parts of the plurality of downward pressing sliders (73).

2. The upper electrode structure for projection welding on the side wall of a U-shaped part according to claim 1, characterized in that: The electrode arm (3) is arranged in a horn shape.

3. The upper electrode structure for projection welding of the side wall of a U-shaped part according to claim 1, characterized in that: A cooling water channel (31) is opened inside the electrode arm (3). An over-mounting hole (32) is opened at one end of the bottom surface of the electrode arm (3).

4. The upper electrode structure for projection welding on the side wall of a U-shaped part according to claim 1, characterized in that: The electrode arm (3), the transition seat (5) and the upper electrode head (6) are all threadedly connected for quick replacement.

5. The upper electrode structure for projection welding on the side wall of a U-shaped part according to claim 1, characterized in that: The plurality of fixed strengthening seats (71) and the movable strengthening block (75) are all made of high-strength insulating materials.

6. The upper electrode structure for projection welding of the side wall of a U-shaped part according to claim 1, characterized in that: The fixed strengthening seat (71) includes a strengthening seat fixing plate (711). The top surface of the strengthening seat fixing plate (711) is arranged on one side of the bottom surface of the upper electrode seat (1). One end of the bottom surface of the strengthening seat fixing plate (711) is provided with a fixing column (712). The upper end of the fixing column (712) is provided with a fixed rear rotating shaft (713). The fixed rear rotating shaft (713) is rotatably connected to the upper end of the strengthening curved arm (72). One end of the tension spring (77) is arranged at the lower end of the fixing column (712). Fixed diagonal braces (714) are respectively arranged on both sides of the lower end of the fixing column (712). The upper ends of the plurality of fixed diagonal braces (714) are all arranged at the other end of the bottom surface of the strengthening seat fixing plate (711). A fixed front rotating shaft (715) is arranged at the other end of the bottom surface of the strengthening seat fixing plate (711). The middle part of the fixed front rotating shaft (715) is rotatably connected to the upper end of the downward pressing connecting rod (74), and its two ends are respectively rotatably connected to the upper ends of the plurality of movable connecting rods (76).

7. The upper electrode structure for projection welding on the side wall of a U-shaped part according to claim 1, characterized in that: On both sides of the middle of the reinforcing bent arm (72), sliding limit blocks (721) are symmetrically arranged, and a plurality of the sliding limit blocks (721) are all abutted against one end of the downward pressing slider (73).

8. The upper electrode structure for projection welding on the side wall of a U-shaped part according to claim 1, characterized in that: The downward pressing slider (73) includes a sliding sleeve (731), the sliding sleeve (731) is slidably connected to the middle of the reinforcing bent arm (72), two sides of one end of the sliding sleeve (731) are respectively provided with limit card slots (732), and a plurality of the limit card slots (732) are respectively abutted against both sides of the middle of the reinforcing bent arm (72). The upper part of the sliding sleeve (731) is provided with a downward pressing sliding shaft (733), the downward pressing sliding shaft (733) is rotatably connected to the lower end of the downward pressing connecting rod (74), and the bottom surface of the sliding sleeve (731) is provided with one end of the tension spring (77).

9. The upper electrode structure for projection welding of the side wall of a U-shaped part according to claim 1, characterized in that: The movable reinforcing block (75) is arranged in a U shape. The top surface of the middle part of the movable reinforcing block (75) is provided with a movable front rotating shaft (751), and the movable front rotating shaft (751) is rotatably connected to the lower ends of a plurality of the reinforcing bent arms (72). The top surfaces of both ends of the movable reinforcing block (75) are respectively provided with movable rear rotating shafts (752), and a plurality of the movable rear rotating shafts (752) are respectively rotatably connected to the lower ends of a plurality of the movable connecting rods (76). The bottom surface of the middle part of the movable reinforcing block (75) is provided with a downward pressing convex block (753), and the bottom surface of the downward pressing convex block (753) is abutted against the top surface of a section of the electrode arm (3).

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