Endless belt flexible tube cleaning lance drive apparatus

A flexible high pressure fluid cleaning lance drive apparatus comprising:

• a housing;
• at least one drive motor having a drive axle in the housing carrying a cylindrical spline drive roller;
• a plurality of cylindrical guide rollers on fixed axles aligned parallel to the spline drive roller, and wherein a side surface of each guide roller and the at least one spline drive roller is tangent to a common plane between the rollers;
• an endless belt wrapped around the at least one spline drive roller and guide rollers, the belt having a transverse splined inner surface having splines shaped complementary to splines on the spline drive roller;
• and
• a bias member supporting a plurality of follower rollers each aligned above one of the at least one spline drive roller and guide rollers, wherein the bias member is operable to press each follower roller toward one of the spline drive rollers and guide rollers to frictionally grip a flexible lance hose when sandwiched between the follower rollers and the endless belt.

A flexible lance drive apparatus comprising:

• a housing;
• a first and a second drive motor disposed side by side and spaced apart in a first portion of the housing, each drive motor having a drive axle projecting across a second portion of the housing each carrying a cylindrical spline drive roller;
• a plurality of cylindrical guide rollers on fixed axles spanning across the second portion of the housing between the spline drive rollers and aligned parallel to the spline rollers, and wherein a side surface of each guide roller and spline drive roller is tangent to a common plane between the spline rollers;
• an endless belt wrapped around the spline drive rollers and guide rollers, the belt having a transverse splined inner surface having splines shaped complementary to splines on the spline drive rollers;
• and
• a bias member supporting a plurality of follower rollers each aligned vertically above one of the spline drive rollers and guide rollers, wherein the bias member is operable to press each follower roller toward one of the spline drive rollers and guide rollers to frictionally grip a flexible lance hose sandwiched between the follower rollers and the endless belt.