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Blast Wheel Parts
Product Description:
Blast Wheel Parts
A blast wheel is the throwing unit of a shot blasting machine: a rotating wheel that takes steel shot in at its centre and releases it from the blade tips under centrifugal force. The same unit is listed as a blast turbine in European catalogues, and parts are ordered under either name. Shot falls through the shot flow tube, is metered by the distributor, passes the window cut in the control cage, and travels out along the blades as a fan rather than a jet. The wear set on this page covers blades, control cage, distributor, impeller, spindle seat, shot flow tube, screw conveyor, bucket elevator hopper, rubber curtains and rubber belts, for the Q32, Q35, Q37, Q69 and QGW machine families. These are replacement parts for wheel blast machines. They do not fit air blast machines, which throw abrasive with compressed air through a nozzle and use a different set of parts entirely — no item here is interchangeable between the two.
How a Blast Wheel Throws Abrasive
Four things decide whether a wheel cleans or smears: where the shot leaves, how fast, how wide the fan is, and whether the shot arrives at a steady rate.
Where the shot leaves. Blades sit radially in the impeller and the wheel turns at a fixed speed. Shot that reaches the blade root is carried outward and released at the tip. Velocity at the tip is a product of wheel diameter and rotational speed, which is why blast wheel power — quoted per wheel, per model — and not abrasive volume, is the figure that sets cleaning intensity.
How wide the fan is. The control cage sits over the distributor and its window decides the arc through which shot can escape. Rotate the cage and the blast pattern moves; open the window and the pattern widens. This is the only adjustment on the machine that changes where the abrasive lands without changing any hardware.
Why parts wear. Abrasive leaves the blade tip at high speed and a fraction of it never leaves — it slides, scuffs and erodes. Blade, control cage and distributor are the three parts that absorb that erosion, and all three degrade in the same direction: the pattern drifts, the cleaning turns uneven, and the wheel starts throwing shot it should have retained.
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Product Description
Blast Wheel Blades: Geometry, Hardness and Service Life
Blades are the highest-consumption item on the machine and the one that most often gets bought wrong.
Geometry. The blade is cast with a tapered section — thicker at the outer edge, thinner toward the root — so that the wear path stays inside the casting for as long as possible rather than cutting through at the tip. A blade worn concave near the tip has lost its throw angle and is loading the adjacent blade; it should come out before it fails, not after.
Hardness. Blades are heat-treated to a surface hardness of HRC 60–65 in high-chromium cast iron. Hardness buys abrasion resistance, not life: a hard blade in dirty abrasive wears faster than a softer one in clean abrasive, because the wear mechanism changes from cutting to impact once the shot stream carries scale and sand.
Service life. Under continuous duty with clean S-330 to S-390 shot and a correctly set separator, a blade set is typically replaced at 800–1,000 hours. Two things shorten that materially — abrasive that carries sand and scale past the separator, and a worn control cage that lets shot strike the blade off-angle.
Balance. A set is trimmed, polished and balanced to within 5 g across the set. This is not cosmetic. An unbalanced set puts a rotating load on the spindle bearing at wheel speed, and the bearing fails long before the blades do.
Control Cage and Distributor: Setting the Blast Pattern
The control cage is the part that most often gets replaced last and needed first.
What it does. The cage is a ring of high-chromium cast iron that shrouds the distributor, with a machined window through which shot escapes onto the blades. Its window angle and position set the direction and spread of the blast pattern. Adjusting it is the standard way to correct a pattern that has drifted off the workpiece.
Why it fails quietly. A cage wears at the window edges, so the opening grows. The symptom is not a breakdown — it is a pattern that widens, cleaning that turns uneven along one edge of the workpiece, and shot consumption that creeps up. Most cages are replaced well after they should be, because nothing stops working.
Inside it. The distributor rotates within the cage and feeds shot radially to the blade roots. Its slots wear in the direction of rotation, and a worn distributor throws the pattern off centre regardless of where the cage is set. Cage and distributor are a pair and should be assessed together.
Impeller, Spindle Seat and Shot Flow Tube
Impeller. The impeller is the disc that carries the blades, in single-disc and double-disc form, matched to left-hand or right-hand rotation. Rotation direction is not interchangeable: a blade set cut for one direction will throw on the wrong face if the wheel is reversed, and the pattern collapses. Confirm rotation direction before ordering blades.
Spindle seat assembly. The seat locates the wheel on the spindle and holds it square to the axis. A worn seat shows up as run-out — the wheel turns true but the pattern wobbles, and no amount of cage adjustment will fix it.
Shot flow tube. The tube delivers abrasive from the feed to the distributor centre. Its bore wears oval under constant flow, and an oval bore biases the feed to one side of the distributor. The two parts work as a pair: a new distributor behind a worn tube still throws an off-centre pattern.
Conveying and Rubber Wear Parts
Screw conveyor. The horizontal screw returns abrasive from the machine floor to the bucket elevator feed. Its job is to keep the floor clear — shot that is allowed to build up packs around the screw and loads the drive, and packed shot also starves the elevator, which is what actually stops the machine.
Bucket elevator hopper. Hoppers are bolted to the elevator belt and lift abrasive to the separator. They are cast in high-chromium cast iron or fabricated in Q345B low-alloy steel plate (S355JR equivalent), and the choice between the two is a trade between wear life and impact resistance: cast hoppers resist abrasion better, fabricated hoppers survive heavy foreign objects without cracking.
Rubber curtains and belts. Curtains seal the entry and exit openings and are cut to the chamber, so hole layout, hole pitch and the number of plies all have to match the machine. Rubber belts for the Q32 and Q35 series are supplied in three hole diameters — 6 mm, 8 mm and 10 mm — and the diameter has to match the belt fasteners already on the machine, not be chosen on preference.
Matching a Part to Your Machine
Parts do not cross between wheel families. Three pieces of information close the gap in a single exchange:
1. Machine model code — for example Q326, Q3210, Q3512, Q376, QGW200. The code fixes the wheel size, rotation direction and the number of wheels.
2. Part name and position — which of the three wear parts, or which peripheral item. Photographs of the worn part in place are faster than any description.
3. One dimension or a nameplate photo — blade length, cage window angle, or the machine nameplate. Any one of these resolves the remaining ambiguity.
Where a machine falls outside the catalogue range or carries a non-standard wheel, the part is engineered to order: we quote against the drawing or the sample, and no catalogue code applies.
Technical Specifications
Q: How long does delivery take?
A: Standard wear parts ship in 35–60 days from receipt of order. Oversize and non-standard items are scheduled separately and carry their own lead time in the quotation. Blades, control cages and distributors are the three items most often held in stock, so they usually land at the early end of that range.
Q: What does a parts quotation cover?
A: A parts quotation covers the part only. Freight, insurance, duties and third-party inspection are excluded and quoted separately by destination port. A complete-machine quotation is a different scope — it covers the blast system, dust collection and the wear parts specific to that model.
Q: Are the parts under warranty?
A: Machine warranty runs 12 months from the final acceptance certificate. Normal wear parts — blades, control cages, distributors, liners — sit outside it, because their life is set by the abrasive and the duty rather than by manufacturing quality. Non-wearing components such as the spindle, bearing housing and wheel housing are covered against manufacturing defect within those 12 months.
Q: How do I confirm a part fits my machine?
A: Send three things and the match is settled: the machine model code, the part name and its position, and one dimension or a photo of the nameplate. Blast wheel parts do not cross between models — blade length and cage window angle differ within the same series, so the code is not a formality.
Q: How often do blades need replacing?
A: Under continuous duty with clean S-330 to S-390 shot and a separator set correctly, a blade set is typically replaced at 800–1,000 hours. Two conditions shorten that materially: abrasive carrying sand and scale past the separator, and a worn control cage letting shot strike the blade off-angle. Judge by the tip — a blade worn concave at the outer edge has lost its throw angle and is loading its neighbour.
Q: What are the signs that the control cage is worn?
A: Nothing stops. Three symptoms arrive together: the blast pattern widens, one edge of the workpiece stops cleaning, and shot consumption creeps up. The cause is the cage window opening growing as its edges wear. Most cages are replaced far too late because the machine never stops running. Check by looking at the window — an out-of-round opening is a spent cage.
Q: Left-hand or right-hand blades — how do I choose?
A: Match the wheel's direction of rotation; the two are not interchangeable. A left-hand blade set on a right-hand wheel throws on its back face, the throw angle collapses, and the workpiece stays dirty while the chamber takes the impact. Confirm rotation before ordering, or send a front-view photo of the wheel and we match from the image.
Q: Will your parts fit another maker's machine?
A: We do not claim cross-brand interchangeability. A blade or cage can be supplied against a competitor's part number, drawing or physical sample when the dimensions resolve; when they do not, it is a non-standard item quoted on its own and not at catalogue price. This is the enquiry this page most often attracts, and the honest answer saves both sides a quotation round.
Q: Do we need your engineer on site to change blades?
A: No. Blades and cages are changed through the access cover on the wheel housing, and written plus video guidance ships with the parts. Site attendance applies to machine installation and commissioning — USD 135 per man-day with overseas travel by the buyer — otherwise remote guidance is available for self-installation.
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