RIMA OFFICIAL CATALOGUE
Product Self blocking sidewise pressing rail clamps
Release date November 2004
Drawings CAT 28rev02 – CAT 29rev02 – CAT 30rev02 – CAT 19/01rev00 – CAT 19/02rev00 –
CAT 19/03rev00 – CAT 18rev01
Pages 17
Self Blocking Rail Clamps
STORM BRAKES SUITABLE
FOR HIGH FORCES
Rima S.r.l.
Via Fermi 255 – 21042 Caronno Pertusella (Va) Italy
Phone: +39 02 9650694 – Fax +39 02 9657860
E-mail: rima@rimagroup.com WWW.RIMAGROUP.COM
WWW.RIMAGROUP.COM
SELF BLOCKING RAIL CLAMPS
The system
These rail clamps are storm brakes suitable for high • Technical features
forces: from 100 to 2000 kN.
They are self-blocking type; in case a force acts on the - Installation: side bolted
crane and tends to put the same into motion, they press - Vertical float = ± 12 mm
on the rail sideways. This pressing gets stronger as the - Horizontal float = ± 40 mm
crane moves. The rail clamps can withstand horizontal - Width of the rail (between shoes) = easy
force only. adjustable within ± 3 mm
- Tolerance respect to nominal width of the rail = ±
The value of forces indicated are calculated with friction 2 mm (or more upon request)
coeff. of 0,25 or 0,45 between sliding blocks and rail. - Opening time (signal for operation) = 4 s .
- Closing time = adjustable from 4 to 12 s.
As the real coeff. in normal conditions is much higher - Operating environment = 24 hours full operation
(approx 0,59 - TUV German register certificated), the rail per day
clamps can generate higher forces. Higher safety and - Life: ≥ 2.000.000 cycles
braking shoes life are guaranteed
On request these values can be modified.
• Advantages
The particular working principle involves the following • Friction coefficient (TUV certified)
advantages:
When braking shoes are new the actual friction coeff.
- Nominal blocking force lightly decrease during the in every situation is = 0,59.
time by the wear of braking shoes, without influence
on the breaking; This value decreases lightly with wear of shoes.
- Rail is not damaged by rail-clamp working;
The braking shoes are to be replaced when the
nominal value of friction coefficient is reached
(Detailed instructions are given in the Use and
Maintenance Manual).
These rail clamps are available with two friction
coefficients: 0,25 or 0,45.
The 0,25 value guarantees an higher safety factor and
very long life of braking shoes (10 to 20 years).
This friction coefficient value (0,25) is moreover
requested in several countries (according to the
relevant standards over there applicable) like for
example Italy, Japan, Slovenia, Serbia and Croatia.
Main European standards (DIN and FEM) are also
foreseeing a friction coefficient value of 0,25 but
allowing the use of higher value, provided that this
value is certified by a suitable register in all possible
working conditions.
To fulfil this requirement, our braking shoes are
certified by German Register (TUV) in several working
condition like wet rail, rail with grease, etc., both in
case of new shoes and in case of shoes with a certain
degree of wear.
2 Rima Technology
WWW.RIMAGROUP.COM
SELF BLOCKING RAIL CLAMPS
Utilization / functioning
This rail clamps are to be considered as parking devices • Closing of Rail Clamps
(safety against the movement caused by wind) and they
work pressing on rail sides.
The closing of rail clamps is obtained by cutting the
The jaws are connected to the frame by a swinging
feeding to the electro-valve. In such a way the oil flows
pendulum device. In “closed position” (ready to work) the
from the cylinder to the tank. The cylinder closes under
jaws lean on the upper surface of rail but they don't apply
the action of calliper weight.
any force to the side-surface of the rail. When the wind
force is stronger than the blocking force given by the
gantry drive brakes, and a small movement of the crane
starts, the inclined planes of the blocks, moving with the
crane frame, oblige the rollers to push the friction shoes
against the sides of the rail.
(See scheme of working principle according to drawing
CAT 19-1/2/3)
OPERATING
• Opening of Rail Clamps
A hydraulic cylinder in pressure opens the rail clamps, this
is achieved by:
a) starting the motor of the hydraulic unit by
closing its remote control switch,
b) energising the coil of the electric pilot check
valve installed in the unit.
The power is sufficient to release the rail clamps without
moving the crane.
In the same time the pump charges an hydraulic hydrogen
accumulator (in parallel with the cylinder) which has the
function, in case of emergency, to give an hydraulic delay
which assures the closing of the rail clamps only after the
complete stop of the crane obtained by gantry brakes.
This solution ensures that the rail clamp will intervene only
after the stops of the crane operated by the gantry drive
brakes also in case of energy breakout.
The charging of the hydraulic accumulator is controlled by
a suitable pressure switch that, when the nominal
pressure is reached, stops the pump motor.
Moreover the pressure switch in case of pressure
decrease, under the required value (in case of leakage)
will re-start the pump until the correct value of pressure
will be reached.
During its opening, the cylinder acts on a suitable limit
switch which signals that the clamp is open allowing the
gantry crane movement.
3 Rima Technology
WWW.RIMAGROUP.COM
SELF BLOCKING RAIL CLAMPS
Composition
• Rail Clamps • Standard painting (only frame and external
parts)
Each rail clamp is composed of:
- Total thickness of 210 µ
- Steel framework with lifting lugs and removable - Sand-blast SA 2 1/2
hinged inspection doors.
- 1.Coat: zinc chromate epoxy primer; thickness 70 µ
- Steel levers and counterweight - 2.Coat: epoxy polyamide paint, thickness 70 µ
- Pins in stainless steel AISI 420 - 3.Coat: polyurethane paint; thickness 70 µ
- Heat treated steel rollers and sliding blocks - Final colour: to be indicated by the client.
- Guides with rail sweeping device
- Steel jaws with braking shoes in 39NiCrMo3, knurled.
quenched and tempered • Fluids for normal temperatures
- Hydraulic cylinder for rail clamp opening with piston
road in NIKROM (carbon steel + Ni + Cr); The Hydraulic oil: ISO VG 22
cylinder is easy replaceable in ca. 20 min. Grease: SKF LGLT2
- Stainless steel tie-road for emergency manual
release.
- Limit switch for clamp release indication. Protection
Electric control unit
IP 65
- External grease lubrication fittings button head type. It is usually foreseen by the crane manufacturer by
means of relays or PLC. On request, it can be supplied
- Bolts, if diameter is less than 12 mm in stainless on plate or in a box (IP 55).
steel, if over galvanized. Here after is illustrated the sketch we suggest, which
foresees the use of a suitable temporised relay (dwg.
CAT 18). This relay is necessary to signal possible
malfunctions in the hydraulic unit (for ex. oil deficiency
• Hydraulic Unit (acc. dwg CAT-30) or breakages of some hydraulic or electric
components).
It is suitable for sea-environment, completely assembled, The logic control of the rail clamps closing is
wired, oil filled and flushed (acc. NAS 12). established by the customer.
Cover in carbon steel with hinged door. The rail clamps are usually closed at the end of the
All the electrical components are wired on option into crane work, or on signal of a suitable anemometer
electrical box (protection IP 55) which signals that the wind speed is higher than the
max. allowed speed.
The signal of closure of the rail clamp must be put
• Emergency manual opening device under a timer to achieve an adjustable electric delay.
As the electrovalve has to be always excited, the
For the emergency manual opening device we use a magnet must be in direct current; if the customer wants
stainless steel tie rod assembled inside the rail clamp. to feed the coil valve with alternated current, a suitable
rectifier is to be supplied.
To open the rail clamp is requested only the turning of a
nut by a standard key tool.
The advantages of this system in comparison with the one
with hand pump are the following:
- The opening is possible even in case of damage of
the cylinder or of the flexible hose for the connection
to the cylinder.
- The rail clamp remains open in the time with absolute
security while in the hand pump execution eventual
small leakages into the cylinder or into the cock
valves may cause the undesired closing of the rail
clamps.
4 Rima Technology
WWW.RIMAGROUP.COM
SELF BLOCKING RAIL CLAMPS
Testing Executions
All the rail-clamps are tested on a test bench before • Normal execution
delivery, at a nominal force power.
- Working temperature: -10°, +40°
- Environment: marine
- Connection: with one side flange
- Hydraulic unit placed inside
- With limit switch that signals clamp open
• Special execution (on request, with extra charge)
- Working temperature: -30°, +40°
- Double side flanges or upper flange (with hydraulic
unit supplied separately from rail clamps)
- Hydraulic unit suitable to operate with more rail
clamps
- Electric terminal board
Documentation - Limit switch which signals "rail clamps closed”
- Horizontal and vertical clearance increased
The documentation is worded according to EG
- Security side stowage pins (to insert suitable holes on
(89/392/EWG) and Euro- EN 292-1/2; 1991 D rules.
the quay)
• Use and Maintenance Manual - Manufacturing according Q.C.P. different from our
• Execution according to rules standard (Nuclear plan or special application)
• Over all dimension drawings
• Hydraulic and electric diagrams Without Without hydraulic unit,
• Suggested spare part list hydraulic unit with hand pump
• Test Certificate (DIN EN 10204-3.1B or DIN EN
10204-2.2 for all main parts)
Documentation in Italian or English. Other languages on
request.
Warranty
12/18 months
Warranty is bound to the following elements:
A) The electric diagram is made accordingly to the
scheme we suggest (CAT 18) or is made accordingly
to a scheme designed by client but in any case
approved by us.
B) All maintenance procedures described in the manual
provided with the supply are observed. In particular
must be strictly observed the rules relevant to
cleanliness and filters replacement.
With parking pin
5 Rima Technology
www.rimagroup.com
SELF BLOCKING RAIL CLAMPS – CAT 28REV02
6 Rima Technology
www.rimagroup.com
SELF BLOCKING RAIL CLAMPS – CAT 29REV02
7 Rima Technology
www.rimagroup.com
SELF BLOCKING RAIL CLAMPS – CAT 30REV02
8 Rima Technology
www.rimagroup.com
SELF BLOCKING RAIL CLAMPS – CAT 19/01REV00
9 Rima Technology
www.rimagroup.com
SELF BLOCKING RAIL CLAMPS – CAT 19/02REV00
10 Rima Technology
www.rimagroup.com
SELF BLOCKING RAIL CLAMPS – CAT 19/03REV00
11 Rima Technology
www.rimagroup.com
SELF BLOCKING RAIL CLAMPS – CAT 18REV01
12 Rima Technology
www.rimagroup.com
SELF BLOCKING RAIL CLAMPS – CAT 18REV01
13 Rima Technology
www.rimagroup.com
SELF BLOCKING RAIL CLAMPS – CAT 18REV01
14 Rima Technology
www.rimagroup.com
SELF BLOCKING RAIL CLAMPS – CAT 18REV01
15 Rima Technology
www.rimagroup.com
SELF BLOCKING RAIL CLAMPS – CAT 18REV01
16 Rima Technology
WWW.RIMAgroup.com
SELF BLOCKING RAIL CLAMPS
17 Rima Technology
