Lower welding wheel assembly lifting device for strip steel on-line narrow lap seam welding machine

Abstract

The invention relates to the field of welding, and discloses a lower welding wheel assembly lifting device for a strip steel on-line narrow lap seam welding machine. The device comprises a hand wheeland a guide sleeve which are mounted on a C-shaped frame, the guide sleeve is mounted on the C-shaped frame through a guide sleeve seat fixed on the outer periphery, a guide column is arranged in theguide sleeve, the top end of the guide column is fixedly connected with a lower connecting plate which is provided with a lower welding wheel assembly, two inclined block devices arranged on that twosides of the guide column are arranged on the guide sleeve seat, each inclined block device comprises an upper inclined block installed at the lower end of the lower connecting plate and a lower inclined block capable of horizontally sliding on the guide sleeve seat, one ends, away from the guide column, of the two lower inclined blocks are fixedly installed on a pushing plate, a nut is arranged on the other surface of the pushing plate, a through hole matched with the nut is formed in the pushing plate, and a trapezoidal screw rod connected with the hand wheel is in threaded connection with the nut and penetrates through the through hole. According to the lower welding wheel assembly lifting device for the strip steel online narrow lap joint welding machine, the horizontal degree and thestraightness change of the lower welding wheel caused by various errors are obviously improved, and the position precision of the lower welding wheel assembly and the stability of the mechanical structure are effectively maintained.

Description

technical field [0001] The invention relates to the field of welding, in particular to a lifting device for a lower welding wheel assembly of an online strip steel narrow lap splicing seam welding machine. Background technique [0002] The lifting device of the lower welding wheel assembly in the strip steel online narrow lap welding machine is an important part of it, and its accuracy directly affects the levelness of the lower welding wheel of the welding machine and the jaws of the clamp and the welding process of the lower welding wheel The parallelism with the jaws of the clamp, which in turn affects 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 in the welding process, the straightness of the lower welding wheel and the jaws is easy to change, which directly leads to deviation of the conductive position of the lower ...

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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 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, which increases 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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