Positioning device for projection welding machine

Abstract

The utility model relates to the technical field of projection welding processing, in particular to a positioning device for a projection welding machine, which comprises an electrode holder, an electrode cover is embedded in the upper surface of the electrode holder, the upper end of the electrode cover is connected with a projection welding material sheet, a projection welding positioning pin is sleeved in the electrode cover, and a projection welding positioning pin base is arranged at the bottom end of the projection welding positioning pin. An electrode cover circular groove matched with the projection welding positioning pin base in shape is formed in the electrode cover, one end of the projection welding positioning pin penetrates through the projection welding material piece to be in threaded connection with the projection welding nut, the projection welding positioning pin base at the other end of the projection welding positioning pin penetrates through the electrode cover to be in threaded connection with one end of the piston rod, and the other end of the piston rod is connected with the air cylinder. The structures of the projection welding positioning pin and the motor cover are changed, the stability of projection welding positioning is guaranteed, the yield and the projection welding quality are guaranteed, and the relative size of a material sheet and a projection welding nut is accurately guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of projection welding processing, in particular to a positioning device for a projection welder. Background Art

[0002] For some projection welding nuts of automobile parts, a cylinder needs to be used to drive. As the cylinder expands and contracts, it drives the projection welding positioning pin to move up and down. The projection welding positioning pin and the cylinder are connected by threads. If the effective length of the projection welding positioning pin for fixing the sheet is adjusted improperly, projection welding quality problems will occur. Summary of the Invention

[0003] In order to overcome the deficiencies of the prior art, the utility model provides a positioning device for a projection welder. The projection welding positioning pin moves up and down inside the electrode cap driven by a cylinder. Through the matching dimensions of the electrode cap and the projection welding positioning pin, it is ensured that when the projection welding positioning pin extends upward to the limit, the height of the effective length of the projection welding positioning pin is the same as that of the projection welding sheet. In this case, production personnel do not need to adjust the dimensions. Through the design, it is ensured that as long as it is installed properly each time, the dimensional requirements can be met.

[0004] To achieve the above object, a positioning device for a projection welder includes an electrode base. An electrode cap is embedded in the upper surface of the electrode base. The upper end of the electrode cap is connected to a projection welding sheet. A projection welding positioning pin is sleeved inside the electrode cap. A projection welding positioning pin base is provided at the bottom end of the projection welding positioning pin. A circular electrode cap groove matching the shape of the projection welding positioning pin base is provided inside the electrode cap. One end of the projection welding positioning pin passes through the projection welding sheet and is threadedly connected to a projection welding nut. The projection welding positioning pin base at the other end of the projection welding positioning pin passes through the electrode cap and is threadedly connected to one end of a piston rod. The other end of the piston rod is connected to a cylinder.

[0005] Through holes for the projection welding positioning pin to pass through, namely an electrode base through hole, a projection welding sheet through hole, and an electrode cap through hole, are provided inside the electrode base, the projection welding sheet, and the electrode cap.

[0006] A positioning pin internal threaded hole is provided inside the projection welding positioning pin base at the end of the projection welding positioning pin. The projection welding positioning pin is threadedly connected to the piston rod through the positioning pin internal threaded hole.

[0007] The top end of the projection welding positioning pin is threadedly connected to the projection welding nut through a positioning pin external thread.

[0008] A projection welding nut inclined surface is provided inside the projection welding nut to cooperate with the projection welding positioning pin inclined surface.

[0009] An effective length section is provided on the projection welding positioning pin. The upper end of the effective length section is connected to a positioning pin inclined surface, and the lower end of the effective length section is connected to a positioning pin vertical section.

[0010] Compared with the prior art, the utility model changes the structures of the projection welding positioning pin and the electrode cap, ensures the stability of projection welding positioning, guarantees the production output and projection welding quality, and accurately ensures the relative dimensions of the blank and the projection welding nut. Description of the Drawings

[0011] Figure 1 It is a schematic diagram of the projection welding positioning pin.

[0012] Figure 2 It is a cross-sectional view of the electrode cap.

[0013] Figure 3 It is a schematic diagram of the projection welding nut.

[0014] Figure 4 It is a cross-sectional view of the utility model.

[0015] See Figures 1 to 4 , 1 is the projection welding positioning pin, 2 is the projection welding blank, 3 is the electrode cap, 4 is the electrode base, 5 is the cylinder, 6 is the projection welding nut, 7 is the piston rod, 8 is the effective length section, 9 is the internal threaded hole of the positioning pin, 10 is the external thread of the positioning pin, 11 is the through hole of the electrode base, 12 is the through hole of the projection welding blank, 13 is the through hole of the electrode cap, 14 is the inclined surface of the projection welding nut, 15 is the inclined surface of the projection welding positioning pin, 16 is the base of the projection welding positioning pin, and 17 is the circular groove of the electrode cap. Detailed Embodiment

[0016] The following further describes the utility model with reference to the drawings.

[0017] As Figures 1 to 4 shown, the upper surface of the electrode base 4 is inlaid with the electrode cap 3. The upper end of the electrode cap 3 is connected to the projection welding blank 2. The diameter of the upper end of the electrode cap 3 is larger than the area of the through hole on the electrode base 4. Therefore, it can be fixed above the electrode base 4 to fix the projection welding blank 2 at a determined height. The projection welding positioning pin 1 is sleeved inside the electrode cap 3. The bottom end of the projection welding positioning pin 1 is provided with the base 16 of the projection welding positioning pin. The electrode cap 3 is internally provided with the circular groove 17 of the electrode cap that matches the shape of the base 16 of the projection welding positioning pin. The circular groove 17 of the electrode cap plays a role in limiting the projection welding positioning pin 1. One end of the projection welding positioning pin 1 passes through the projection welding blank 2 and is threadedly connected to the projection welding nut 6. The projection welding nut 6 plays a role in fastening the projection welding blank 2 on the electrode cap 3. The base 16 of the projection welding positioning pin at the other end of the projection welding positioning pin 1 passes through the electrode cap 3 and is threadedly connected to one end of the piston rod 7. The other end of the piston rod 7 is connected to the cylinder 5. The cylinder 5 provides driving for the telescopic movement of the piston rod 7.

[0018] The electrode base 4, the projection welding blank 2 and the electrode cap 3 are internally provided with the through holes 11 of the electrode base, the through holes 12 of the projection welding blank and the through holes 13 of the electrode cap for the projection welding positioning pin 1 to pass through.

[0019] Inside the projection welding locating pin base 16 at the end of the projection welding locating pin 1, there is a locating pin internal threaded hole 9. The projection welding locating pin 1 is threadedly connected to the piston rod 7 through the locating pin internal threaded hole 9.

[0020] The top end of the projection welding locating pin 1 is threadedly connected to the projection welding nut 6 through the locating pin external thread 10.

[0021] On the inner side of the projection welding nut 6, there is a projection welding nut inclined surface 14 that cooperates with the projection welding locating pin inclined surface 15.

[0022] On the projection welding locating pin 1, there is an effective length section 8. The effective length section 8 is connected to the locating pin inclined surface 15 at the upper end and the locating pin vertical section at the lower end. The length of the effective length section 8 depends on the thickness of the projection welding solder sheet 2. Through the thickness of the projection welding solder sheet 2, the projection welding locating pin 1 corresponding to the effective length section 8 can be quickly matched.

[0023] When the present utility model is in use, first select a projection welding locating pin 1 with an effective length section 8 having the same thickness as the projection welding solder sheet 2. Thread the projection welding locating pin 1 onto the piston rod 7 on the cylinder 5 first, and then install the electrode cap 3 in the electrode seat 4. The bottom end of the electrode cap 3 is sleeved in the electrode seat through hole 11. The side wall of the electrode cap 3 has a protruding structure to limit the electrode cap 3 to prevent it from coming out of the electrode seat 4. Place the projection welding solder sheet 2 on the upper end of the electrode cap 3, align the projection welding solder sheet through hole 12 with the electrode cap through hole 13, start the cylinder 5, and make the projection welding locating pin 1 push upward until the projection welding locating pin base 16 rises to the position of the electrode cap circular groove 17. Since the side wall of the electrode cap 3 has a protruding structure, the electrode cap 3 will not be lifted due to the force. Therefore, when the projection welding locating pin base 16 contacts the electrode cap circular groove 17, the projection welding locating pin 1 reaches the limit position of upward movement. At this time, its effective length section 8 coincides with the projection welding solder sheet 2. At the same time, the technician fastens the part of the projection welding locating pin 1 that penetrates the projection welding solder sheet 2 with the projection welding nut 6, thereby completing the fixation of the projection welding work. Projection welding often requires repeated fixation, and the thickness of the projection welding solder sheets 2 in the same batch is basically the same. When installing again, the present utility model only needs to ensure that the parts are installed well and the projection welding locating pin 1 rises to the limit position to meet the dimensional requirements. By simply changing the structures of the projection welding locating pin 1 and the electrode cap 3, the stability of repeated projection welding positioning is ensured, and the product quality of the projection welding locating pin 1 is guaranteed.

Claims

1. A positioning device for a projection welding machine, comprising an electrode holder, characterized in that: An electrode cover (3) is embedded in the upper surface of the electrode seat (4), the upper end of the electrode cover (3) is connected to the projection welding sheet (2), a projection welding positioning pin (1) is sleeved inside the electrode cover (3), a projection welding positioning pin base (16) is provided at the bottom end of the projection welding positioning pin (1), a circular electrode cover groove (17) matching the shape of the projection welding positioning pin base (16) is provided inside the electrode cover (3), one end of the projection welding positioning pin (1) passes through the projection welding sheet (2) and is threadedly connected to the projection welding nut (6), the projection welding positioning pin base (16) at the other end of the projection welding positioning pin (1) passes through the electrode cover (3) and is threadedly connected to one end of the piston rod (7), and the other end of the piston rod (7) is connected to the cylinder (5).

2. A positioning device for a projection welding machine according to claim 1, characterized in that: The electrode seat (4), the convex solder sheet (2) and the electrode cover (3) are provided with an electrode seat through hole (11), a convex solder sheet through hole (12) and an electrode cover through hole (13) for the convex solder positioning pin (1) to pass through.

3. A positioning device for a projection welding machine according to claim 1, characterized in that: A projection welding locating pin base (16) at the end of the projection welding locating pin (1) is provided with a locating pin internal thread hole (9) inside, and the projection welding locating pin (1) is threadedly connected to the piston rod (7) via the locating pin internal thread hole (9).

4. A positioning device for a projection welding machine according to claim 1, characterized in that: The top end of the projection welding positioning pin (1) is threadedly connected to the projection welding nut (6) via the positioning pin external thread (10).

5. A positioning device for a projection welding machine according to claim 1, characterized in that: The inner side of the projection welding nut (6) is provided with a projection welding nut inclined surface (14) which matches with the projection welding positioning pin inclined surface (15).

6. A positioning device for a projection welding machine according to claim 1, characterized in that: The projection welding positioning pin (1) is provided with an effective length section (8), the upper end of the effective length section (8) is connected to the positioning pin inclined surface (15), and the lower end of the effective length section (8) is connected to the positioning pin vertical section.

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