Type
Mobile plant structures, screen boxes and plant frames
The welded steel of a mobile processing plant: a tracked or wheeled chassis carrying a feed hopper, a screen box and a folding stacking conveyor, the screen box itself with its plated side walls and discharge lip, and the sub-assemblies that bolt to it. These are the largest pieces in the gallery, up to fourteen metres long.
A plant structure is many weldments that must fit each other, so the fixtures and the measuring are as much of the work as the welding.
What the drawing must show
A part like this is priced from the drawing. The quotation is fastest when it carries:
- The assembly drawing and the weldment drawings, with the bolted interfaces between them
- Which faces and bores are machined, and the tolerances between them across the assembly
- Plate thicknesses and section sizes with the material grade
- Weld symbols on the main joints, and the inspection level
- The finish, and the sequence if parts are painted before assembly
8 models of this type
Real structures that came through this company as built jobs, quoted enquiries or designs from our own office, shown as anonymous models with their measured size. Open one for its description.
- Overall size, L x W x H
- 12 359 x 2 579 x 3 383 mm
A tracked mobile plant structure built from a deep flared hopper, a louvred machine house with access panels, a folded crawler undercarriage and a long inclined conveyor on a braced truss frame. Handrails, lifting lugs and stiffening ribs run along the hopper edges and conveyor sides. It measures about 12.4 m long, 2.6 m wide and 3.4 m high. Here a part like this is set on a fixture, tacked and welded out and welded on the 14 m robotic track for a series, by hand for a one-off.
- Overall size, L x W x H
- 11 993 x 2 898 x 3 616 mm
A mobile plant structure made up of a plated chassis on skid feet, a boxed feed hopper, a screen box on spring mounts, and a folded stacking conveyor with lattice side rails. Support legs, a fold-up discharge lip and chain bracing on the conveyor boom stand out. It measures about 12.0 m long, 2.9 m wide and 3.6 m high. In this hall a part like this is set on a fixture, tacked and welded out and laser cut from plate up to 20 mm.
- Overall size, L x W x H
- 14 645 x 8 423 x 3 858 mm
A mobile plant structure built around a central screen box on a welded chassis of box and hollow section, with an inclined conveyor frame lifting from each end on truss legs, a wheeled axle, folding support legs and small lifting lugs. What stands out is the pair of long raking conveyor gantries with cross bracing rising from the low central frame. It measures about 14.6 m long, 8.4 m wide and 3.9 m high. A part like this is welded out on a fixture.
- Overall size, L x W x H
- 8 219 x 2 350 x 3 016 mm
A mobile plant structure built as a welded chassis of channel and box section rails, carrying a raised screen box, a discharge chute and an axle with a single wheel, braced by diagonal struts and angled support legs. A sloped folded chute plate, a cylindrical drive housing and open mesh decking stand out against the plain plate rails. It measures about 8.2 m long, 2.4 m wide and 3.0 m high. Such parts are tacked up on a fixture and welded through.
- Overall size, L x W x H
- 13 482 x 12 196 x 8 468 mm
A hopper container structure stands on a closed box container base, with corrugated side plate, three internal hopper bins, and a grid of support posts and cross bracing along the side. Three parallel inclined conveyor troughs climbing in unison from the hopper outlets stand out. It measures about 13.5 m long, 12.2 m wide and 8.5 m high. A piece like this is tacked up on a fixture and welded through and welded on the robotic track or by hand.
- Overall size, L x W x H
- 4 078 x 2 466 x 1 443 mm
A screen box forms the main assembly of this plant structure, with deep plated side walls, folded stiffening ribs, a drive housing on one face and a sloped discharge lip at the open end. Angled brackets and a mesh deck sit inside the folded shell, with lifting lugs along the top edge. It measures about 4.1 by 2.5 m and stands 1.4 m high. Such a part is tacked up on a fixture and welded through, with the bores and pads machined after welding.
- Overall size, L x W x H
- 3 303 x 1 569 x 648 mm
A screen deck frame of folded side plates with rows of bolt holes, cross braces, and small mounting lugs along the edges. One end folds down into an angled, ribbed discharge lip with a bolted edge, stiffened underneath by boxed gussets seen from the back. It measures about 3.3 m long, 1.6 m wide and 0.6 m high. Pieces like this are set on a fixture, tacked and welded out, laser cut from plate up to 20 mm and bent on the 400 t press brake.
- Overall size, L x W x H
- 3 307 x 1 646 x 610 mm
A plant sub-assembly built from two sloped deck plates meeting at a folded central ridge, carried on angled side plates. The side plates carry a row of bored holes along their length, with brackets and clevis lugs at both ends for pinning into a larger frame. It measures about 3.3 m long, 1.6 m wide and 0.6 m high. Pieces like this are tacked up on a fixture and welded through, laser cut up to 20 mm and folded on the press brake.
Each model is rendered from its own geometry in raw steel, without paint, and is shown as a still. Customer names, machine designations and drawing numbers are not published; part lists and files are not offered. The interactive model above this section is a parametric example, not one of these.
How a part like this goes through the hall
Each weldment is cut, folded and welded on its own fixture, then machined where the drawing says so on a boring mill with 6 200 x 3 000 x 1 600 mm of travel. The pieces are blasted and painted in booths of 8 000 x 5 000 x 3 000 mm and 7 900 x 5 000 x 4 890 mm, and trial assembled and measured with a six-axis measuring arm before they leave.
Where this fits
Capabilities it runs through
Industries that order it
Notes from the blog
Other types in this group
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