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Vibrating Screen Spring / Steel & Rubber Spring

Isolation springs for vibrating screens: rubber cylinders in 40 standard sizes and steel coil springs to the machine mount. The spring sets the screen

Isolation springs for vibrating screens: rubber cylinders in 40 standard sizes and steel coil springs to the machine mount. The spring sets the screen amplitude and keeps that amplitude off the structure, so a spring that has gone soft shows up first as a screen that will not hold its stroke.

Rubber spring parameter table (G x H x D)

Size (mm)	Outside dia (mm)	Bore (mm)	Free height (mm)	Working deflection FV (cm)	Stiffness KL (kg/cm)	Static load (kg)
55x50x25	55	25	50	0.5	50	50
60x60x20	60	20	60	0.6	60	60
80x60x20	80	20	60	0.6	60	60
80x80x25	80	25	80	0.8	100	100
80x80x30	80	30	80	0.8	100	100
80x110x40	80	40	110	1.1	120	120
100x90x17	100	17	90	0.9	130	130
100x100 solid	100	solid	100	1.0	140	140
100x100x25	100	25	100	1.0	140	140
100x100x30	100	30	100	1.0	140	140
100x130x30	100	30	130	1.3	150	180
120x120x30	120	30	120	1.2	220	260
120x140x30	120	30	140	1.4	230	270
125x150x50	125	50	150	1.5	300	420
140x140x30	140	30	140	1.4	300	420
140x160x30	140	30	160	1.6	350	490
140x160x40	140	40	160	1.6	350	490
140x200x30	140	30	200	2.0	350	490
160x160x30	160	30	160	1.6	350	560
160x160x40	160	40	160	1.6	350	560
160x160x50	160	50	160	1.6	350	560
160x160x60	160	60	160	1.6	350	560
160x180x30	160	30	180	1.8	350	560
180x180x40	180	40	180	1.8	400	720
180x200x40	180	40	200	2.0	400	800
180x240x40	180	40	240	2.5	400	1000
200x150 solid	200	solid	150	1.5	380	570
200x150x65	200	65	150	1.5	350	520
200x180x40	200	40	180	1.8	350	520
200x200x40	200	40	200	2.0	450	900
200x200x50	200	50	200	2.0	450	900
200x200x60	200	60	200	2.0	450	900
220x220x40	220	40	220	2.2	500	1100
220x220x50	220	50	220	2.2	500	1100
240x240x40	240	40	240	2.4	550	1300
240x240x50	240	50	240	2.4	550	1300
250x250x50	250	50	250	2.5	580	1450
280x170 solid	280	solid	170	1.7	700	1200
280x170x40	280	40	170	1.7	700	1200
280x170x50	280	50	170	1.7	700	1200
280x170x60	280	60	170	1.7	700	1200
block 300x150x100	-	-	100	-	-	-
block 200x125x100	-	-	100	-	-	-
block 240x120x80	-	-	80	-	-	-

Warehouse stock and loading

Photographs taken in our own warehouse: finished jaw plates in stock, packed for export, and loaded for shipment. Stock levels change week to week — ask what is on the floor before you plan a shutdown.

What the spring does, and what it costs when it softens

A screen spring does two jobs at once: it lets the deck move at its designed stroke, and it stops that movement reaching the frame. Rubber does the first job by deforming - it has a low elastic modulus and takes a large deflection under load, which is how it absorbs shock and vibration from the deck.

The failure is gradual. A rubber spring that has taken a set still holds the screen up, but it no longer returns the energy, so the stroke falls away and the screen starts to blind. Operators usually blame the mesh first. Measure the stroke before ordering mesh: if it is down, the springs are the cheaper answer.

Rubber or steel

Rubber takes load in several directions at once and needs no lubrication, which is why it is the default on a screen that is moved between sites. It is weaker than steel on heat and on oil: above roughly 60 C in service, or where hydraulic oil reaches the springs, rubber ages quickly.

Steel coil springs take heat and oil without complaint and hold their rate for years, but they transmit more high-frequency vibration into the frame and they corrode in a wash plant. On a hot or oily duty, steel is the right answer; on a wet, cold or mobile duty, rubber is.

Reading the parameter table

Each row is one mould: outside diameter, bore, free height, working deflection, stiffness and the static load the spring carries at that deflection. Choose by the load at each mount, not by the size that looks closest - four springs share the deck weight, and a spring picked two steps light will sit at its working deflection before the screen is even loaded.

The solid (no bore) sizes are the stiffest in their diameter and are used where height is limited. The three rectangular blocks at the bottom of the table are damping pads rather than springs: they sit under a chute or a motor base and take shock, not stroke.

• Free height and bore are the mounting dimensions - match them before anything else, because a spring that does not fit the seat cannot be shimmed into place.
• Stiffness is quoted in kg/cm and static load in kg; both are per spring, not per screen.
• Springs are replaced as a set. One new spring next to three tired ones loads the new one first and it fails early.

Ordering

Send the machine model and the spring size printed on the old part, or the outside diameter, bore and free height measured with a rule. Steel coil springs are made to the mount dimensions and wire diameter of the machine, so a drawing or a sample is the safest route.

Oil-resistant rubber is available for screens fed from a wet process or mounted near a gearbox breather; it is a different compound, not a different mould, so the size stays the same.

Types	Rubber cylinder / steel coil spring
Rubber sizes	55-280 mm outside diameter, 50-250 mm free height
Static load	50-1450 kg per spring
Material	Natural rubber; oil-resistant rubber on request
Price	USD 10-30 per piece

Other parts in this group

• Screen Mesh

Independent aftermarket parts supplier. Not affiliated with, endorsed by, or sponsored by Metso, Sandvik or any other original equipment manufacturer. Brand and model names are used only to describe fitment.

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