Device for preventing projection welding upper electrode from adhering to part

Abstract

The utility model relates to the field of electric welding equipment, in particular to a device for preventing a projection welding upper electrode from adhering to a workpiece, which comprises a fixed plate fixedly connected through an upper electrode, and a material jacking frame is elastically connected below the fixed plate; the material jacking frame is insulated in the welding process, so that the welding safety is ensured; through elastic connection of the material ejecting frame and the fixing plate, the spring stores energy in the downward pressing process of the upper electrode, after welding is completed, the material ejecting frame ejects a workpiece downwards under the elastic force of the spring, and therefore it is guaranteed that the workpiece is smoothly taken from a production line, false alarm of a visual photographing unit is avoided, and then the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of electric welding equipment, in particular to a device for preventing electrodes from sticking to parts during projection welding. Background Art

[0002] Projection welding is a resistance welding method in which one or more convex points are pre-machined on the mating surface of the workpiece, so that it contacts the surface of another workpiece and is electrically heated and then collapsed to form welds at these contact points. The welding electrodes of the projection welding equipment are generally divided into an upper electrode, a lower electrode and a positioning pin. When welding, the corresponding welding parameters (welding current, welding time, welding pressure) are set, the workpiece is placed in the positioning pin, and the parent material is fitted with the lower electrode. After the equipment is started, the upper electrode presses down on the surface of the part to reach the set pressure and then energizes the welding. After the welding is completed, the upper electrode is lifted to its initial state. Since some parts have high welding strength requirements and the equipment parameters are set relatively large, the high current or high pressure during welding causes the parts to stick to the upper electrode after welding. On the one hand, this makes it inconvenient to pick up the parts. On the other hand, when the visual camera error-proofing unit set up in the production line cannot detect the parts, it will trigger a false alarm. Utility Model Content

[0003] Aiming at the problem that the upper electrode is easy to stick to parts at present, the utility model provides a device to prevent the upper electrode of projection welding from sticking to parts.

[0004] In order to achieve the above-mentioned utility model purpose, the utility model provides a device to prevent the upper electrode of projection welding from sticking to parts, including a fixing plate fixed by the upper electrode, and a lifting frame is elastically connected below the fixing plate.

[0005] The utility model arranges an elastic ejecting frame on the upper electrode, and after the upper electrode is welded, the workpiece adhered to the upper electrode is ejected by elastic force, thereby avoiding manual removal of the workpiece and improving production efficiency.

[0006] Furthermore, the ejector rack includes an ejector plate and an ejector block connected below the ejector plate. The ejector plate is connected to a fixed plate via a plurality of guide bolts, and springs are provided on the studs between the fixed plate and the ejector plate. The guide bolts serve as guide rails for the ejector plate to slide up and down, and the springs are provided to ensure that the ejector plate can return to its original position after being subjected to external force, that is, to ensure that the ejector rack ejects the parts away from the upper electrode.

[0007] Furthermore, the fixing plate is provided with a first through hole matching the gap of the upper electrode, and the ejecting frame is provided with a second through hole matching the gap of the upper electrode.

[0008] Furthermore, the fixing plate is provided with a plurality of first threaded holes, the top plate is provided with a third through hole, and the guide bolts are respectively matched with the first threaded holes and the third through holes. The threaded end of the guide bolt is matched with the first threaded hole, and the nut end limits the top plate to ensure that the top plate slides smoothly on the light rod of the guide bolt.

[0009] Furthermore, the bottom of the top block is provided with a plurality of notches, which are connected to the second through hole. Since the parts contacted by the upper electrode are of different styles, the notches are provided at the bottom of the top block so that the top material rack can be applied to welding scenarios of different parts and base materials.

[0010] Furthermore, the fixing plate further comprises a second threaded hole and a set screw matched with the second threaded hole. The set screw is used to fix the fixing plate on the upper electrode.

[0011] Furthermore, the material ejector is made of insulating material. Since the upper electrode will be energized after pressing the workpiece surface, and the material ejector is also in contact with the workpiece surface, the insulation of the material ejector needs to be ensured to avoid circuit shunting.

[0012] Beneficial effects: The ejector rack of the utility model is insulated during the welding process, ensuring welding safety; the ejector rack is elastically connected to the fixed plate, and the spring stores energy during the downward pressure of the upper electrode. After welding is completed, the ejector rack pushes the workpiece downward under the elastic force of the spring, thereby ensuring smooth retrieval on the production line, avoiding false alarms of the visual camera unit, and thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model.

[0014] Figure 2 It is a cross-sectional view of the utility model.

[0015] Markings in the figure: upper electrode 1, lower electrode 2, workpiece 3, base material 4, fixing plate 5, first threaded hole 51, second threaded hole 52, first through hole 53, set screw 54, guide bolt 6, spring 7, ejector rack 8, ejector plate 81, second through hole 82, third through hole 83, ejector block 84, notch 85. DETAILED DESCRIPTION

[0016] The utility model is described in detail below in conjunction with the accompanying drawings.

[0017] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0018] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do 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 should not be understood as a limitation on the present invention.

[0019] In the description of the present utility model, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection of two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0020] like Figure 1 , Figure 2 As shown, the utility model provides a device to prevent the upper electrode 1 of projection welding from sticking, by sleeved with a fixing plate 5 and a lifting frame 8 on the outer periphery of the cylindrical upper electrode 1, the fixing plate 5 is fixedly connected to the upper electrode, and the lifting frame 8 is elastically connected below the fixing plate 5, wherein the center of the fixing plate 5 is provided with a first through hole 53 which is gap-matched with the upper electrode 1, and the lifting frame 8 is provided with a second through hole 82 which is gap-matched with the upper electrode 1; the lifting frame 8 is connected by a top plate 81 and a top block 84 below the top plate 81, and the lifting frame 8 is manufactured by integral molding, and four first threaded holes 51 are opened on the fixing frame, and the top block 84 is connected with the top block 84 below the top plate 81. Four third through holes 83 corresponding to the first threaded hole 51 are provided in the vertical direction of the plate 81, and a matching guide bolt 6 is provided in the third through hole 83. The threaded end of the guide bolt 6 is matched and connected with the first threaded hole 51, and a spring 7 is sleeved on the guide bolt 6 between the fixed plate 5 and the top plate 81, so that the elastic connection between the top material rack 8 and the fixed plate 5 is realized; four third threaded holes are also opened on the fixed plate 5, and the third threaded holes are connected with the first through holes 53. The set screws 54 are screwed into the third threaded holes to tighten the upper electrode 1 to ensure that the fixed plate 5 is fixedly installed on the upper electrode 1.

[0021] A plurality of notches 85 are provided at the bottom of the top block 84, and the notches 85 are connected to the second through hole 82. Since the parts contacted by the upper electrode 1 are of different styles, the notches 85 are provided at the bottom of the top block 84, so that the top frame 8 can be applied to welding scenarios of different parts and base materials 4. The top frame 8 is made of insulating material. Since the upper electrode 1 will be energized after pressing down on the surface of the workpiece 3, the top frame 8 is also in contact with the surface of the workpiece 3. In order to avoid circuit shunting, it is necessary to ensure that the top frame 8 is insulated.

[0022] The use process of the utility model is as follows: Figure 1As shown, a base material 4 is placed vertically above the lower electrode 2 of the welding equipment, and a workpiece 3 is placed on the base material 4. During normal welding, the upper electrode 1 presses the workpiece 3 downward to make the workpiece 3 close to the base material 4, and then power is turned on to make the upper electrode 1 and the lower electrode 2 form a closed loop. The huge energy released by the welding equipment melts the contact point between the workpiece 3 and the base material 4 to achieve welding; when the welding strength requirement is high, the welding parameters (welding current, welding time, welding pressure) are set to a large value, which easily causes the workpiece 3 to stick to the upper electrode 1 after welding is completed, thereby increasing the manual removal step; however, after the device of the utility model is installed, during the process of the upper electrode 1 pressing the workpiece 3 downward, the ejector rack 8 first contacts the workpiece 3 or the base material 4, slides upward along the guide bolt 6 and compresses the spring 7 to store energy in the spring 7. When the welding is completed, the upper electrode 1 moves upward, and the ejector rack 8 pushes the workpiece 3 away from the upper electrode 1 under the action of the spring 7, thereby achieving the anti-sticking function, avoiding manual removal, thereby saving manpower, and improving the production efficiency of the production line.

[0023] 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 protection scope of the present invention.

Claims

1. A device for preventing electrodes from sticking to parts during projection welding, characterized in that: It comprises a fixed plate (5) fixed by an upper electrode, and a material ejection frame (8) is elastically connected below the fixed plate (5); the material ejection frame (8) comprises a top plate (81) and a top block (84) connected below the top plate (81); the top plate (81) is connected to the fixed plate (5) by a plurality of guide bolts (6), and springs (7) are provided on the studs between the fixed plate (5) and the top plate (81).

2. A device for preventing electrodes from sticking to parts during projection welding according to claim 1, characterized in that: The fixing plate (5) is provided with a first through hole (53) which is clearance-matched with the upper electrode (1), and the ejecting frame (8) is provided with a second through hole (82) which is clearance-matched with the upper electrode (1).

3. A device for preventing electrodes from sticking to parts during projection welding according to claim 2, characterized in that: The fixing plate (5) is also provided with a second threaded hole (52) and a set screw (54) matched with the second threaded hole (52), and the second threaded hole (52) is communicated with the first through hole (53).

4. The device for preventing electrodes from sticking to parts during projection welding according to claim 1, characterized in that: The fixing plate (5) is provided with a plurality of first threaded holes (51), the top plate (81) is provided with a third through hole (83), and the guide bolts (6) are respectively matched with the first threaded holes (51) and the third through holes (83).

5. The device for preventing electrodes from sticking to parts during projection welding according to claim 1, characterized in that: The bottom of the top block (84) is provided with a plurality of notches (85).

6. The device for preventing electrodes from sticking to parts during projection welding according to claim 1, characterized in that: The material ejecting frame (8) is made of insulating material.

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