Lower welding wheel assembly lifting device for strip steel in-line narrow lap seam welder

Abstract

The invention relates to the field of welding, and discloses a lower welding wheel assembly lifting device for a strip steel in-line narrow lap seam welder, comprising a hand wheel and a guide sleeve installed on a C-shaped frame, the guide sleeve passing through The guide sleeve seat fixed on the outer circumference is installed on the C-shaped frame, the guide sleeve is provided with a guide column, the top of the guide column is fixedly connected with a lower connecting plate with a lower welding wheel assembly installed, and the guide sleeve seat is also installed with a lower connecting plate. Two sets of inclined block devices are arranged on both sides of the guide column. The inclined block device includes an upper inclined block installed at the lower end of the lower connecting plate and a lower inclined block that can slide horizontally on the guide sleeve seat. The two lower inclined blocks are away from one end of the guide column. Both are fixedly installed on the push plate, the other side of the push plate is provided with a nut, the push plate is provided with a through hole matching the nut, and the trapezoidal lead screw connected with the handwheel is threadedly connected with the nut and passes through the through hole. The invention is used for the lifting device of the lower welding wheel assembly of the strip steel on-line narrow lap seam welding machine, which obviously improves the changes in the levelness and straightness of the lower welding wheel caused by various errors, and effectively maintains the lower welding wheel assembly. The position accuracy and the stability of the mechanical structure.

Description

technical field [0001] The invention relates to the field of welding, in particular to a lower welding wheel assembly lifting device for a strip steel in-line narrow lap seam welder. Background technique [0002] The lower welding wheel assembly lifting device in the strip steel in-line narrow lap welding machine is an important part of it, and its accuracy directly affects the levelness of the lower welding wheel and the jaws of the welding machine and the lower welding wheel during the welding process. The parallelism with the jaws of the clamp, thereby affecting the welding quality. [0003] During the actual debugging and online operation of the welding machine, there is a problem that the verticality of the lower welding wheel assembly is easy to change, and during the welding process, the straightness of the lower welding wheel and the jaw is easy to change, which directly leads to the deviation of the conductive position of the lower welding wheel. shift. Since the ...

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Problems solved by technology

Therefore, in the welding process, the instability of the lap resistance R will cause the welding quality of the welded strip to be affected by the unstable heat.

[0006] On the other hand, since the entire lifting device is mainly completed by the relative movement of the screw lifter and the trapezoidal screw, and the trapezoidal screw has a matching gap, during the operation of the device, when the pressure of the upper welding wheel is pressed against the lower welding wheel, the entire impact The force is fully transmitted to the lifting device, combined with Figure 9 and Figure 10 As shown, due to the uneven force on the guide rods on both sides, after the device has been running for a period of time, the gap between the guide rod and the guide sleeve is likely to expand, and there is a gap between the guide rod and the guide sleeve on the left and right sides, resulting in the lower welding wheel assembly being stressed. Deflection to one side changes the verticality. During the welding process, due to the pressure extrusion of the upper welding wheel, the overlap of the strip is continuously reduced from the operation side to the transmission side.

In this process, the contact area between the upper and lower welding wheels decreases to increase the current density, and the heat formula Q=I 2 RT shows that: the current density I increases, the heat Q also increases, on the contrary, the current density I decreases, the heat Q also decreases, and the instability of the current density I during the welding process will also cause the welded strip to be unstable due to heat instability. Affect welding quality

At the same time, due to the gap between the guide rod and the guide sleeve, the verticality of the lower welding wheel assembly is unstable, and the parallelism between the lower welding wheel and the jaws is likely to change, resulting in a tendency for the lower welding wheel assembly to have a horizontal orientation during the welding process. The deflection of the welding seam makes the welded seam not a straight line but an irregular curve, which affects the strength and appearance of the weld seam, and once the existing lower welding wheel assembly is displaced and deformed, it is difficult to adjust it through the lifting device its levelness and straightness

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