SMC Networks MWB-X3075 Series User manual

MWB#-TF2Z418EN
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Instruction Manual
MWB-X3075, MWB-X3246 & MWB-UT-X3075
series
Cylinder with Lock/Brake: MWB-X3075/X3246
Lock
Brake
Lock/Brake Unit: MWB-UT-X3075
Lock
Brake
The intended use of the lock/brake unit is to be used as an individual
product and integrated into an MWB cylinder for intermediate stop,
emergency stop and drop prevention.
1 Safety Instructions
These safety instructions are intended to prevent hazardous situations
and/or equipment damage. These instructions indicate the level of
potential hazard with the labels of “Caution,” “Warning” or “Danger.”
They are all important notes for safety and must be followed in addition
to International Standards (ISO/IEC)*1), and other safety regulations.
*1) ISO 4414: Pneumatic fluid power - General rules relating to systems.
ISO 4413: Hydraulic fluid power - General rules relating to systems.
IEC 60204-1: Safety of machinery - Electrical equipment of machines.
(Part 1: General requirements)
ISO 10218-1: Manipulating industrial robots -Safety. etc.
Refer to product catalogue, drawings, Operation Manual and Handling
Precautions for SMC Products for additional information.
Keep this manual in a safe place.
Caution
Caution indicates a hazard with a low level of risk which, if
not avoided, could result in minor or moderate injury.
Warning
Warning indicates a hazard with a medium level of risk
which, if not avoided, could result in death or serious injury.
Danger
Danger indicates a hazard with a high level of risk which, if
not avoided, will result in death or serious injury.
Warning
Always ensure compliance with relevant safety laws and
standards.
Only personnel with appropriate training should operate
machinery and equipment.
The product specified here may become unsafe if handled incorrectly.
The assembly, operation and maintenance of machines or equipment
including our products must be performed by an operator who is
appropriately trained and experienced.
This cylinder with lock or the separate lock unit employs an exhaust
locking system. Sudden braking will occur, if the air supply to the
locking unit is lost or becomes lower than the minimum operating
pressure.
2 Specifications
2.1 Cylinder Specifications
Bore size [mm]
32
40
50
63
80
100
Action
Double acting
Fluid
Air1
Proof pressure
1.5 MPa
Max. operating
pressure
1.0 MPa
Min. operating
pressure
0.08 MPa
Ambient and
fluid
temperatures
Without auto switch: −10°C to 70°C (No freezing)
With auto switch: −10°C to 60°C
Lubricant
Not required (Non-lube)
Piston speed
50 to 1000 mm/s2
Stroke length
tolerance
~250st: +1.0
0, 251~1,000st: +1.4 0
Cushion
Air cushion
Port size
(Rc, NPT, G)
1/8
1/4
3/8
1/2
Mounting
Basic type
1 Select an air filter with a filtration size of 5μm or smaller. For detailed
information please refer to the operation manual.
2Load limits exist depending upon the piston speed when locked,
mounting direction, and operating pressure.
2.2 Lock Unit Specifications
Bore size
[mm]
32
40
50
63
80
100
Locking
action
Exhaust locking
Max.
operating
pressure
1.0 MPa
Min.
operating
pressure
0.3 MPa
Locking
direction
Both directions
Holding force
(Max. static
load)[N]1
630
980
1570
2450
3920
6080
This locking unit does not have manual lock release.
*1The holding force (max static load) shows the maximum capability and
does not show the normal holding capacity. Select a cylinder using the
method described in Model Selection in MWB catalogue or operation
manual.
2.3 Stopping Accuracy
Bore size [mm]
32
40
50
63
80
100
Lock type
Exhaust Locking
Stopping
accuracy [mm]
±1.0
Conditions
Mounting orientation: Horizontal
Supply pressure: 0.5 MPa
Piston speed: 300 mm/s
Load condition: Upper limit of allowed value
Solenoid valve for locking is mounted on the unlock port.
Maximum value of stopping position dispersion from 100 measurements
2.4 Overrun distance (All bore sizes)1) 2) 3)
Overrun distance s [mm] after venting the lock unit to standstill at
vertical mounting position as a function of speed v [mm/s] at 0.6 MPa.
2.4.1 Ø32mm
2.4.2 Ø40mm
2.4.3 Ø50mm
2.4.4 Ø63mm
2.4.5 Ø80mm
2.4.6 Ø100mm
1) Overrun distance for all bore sizes are validated according to ISO
13849-2. It is allowed to brake at every intermediate position. The
actual overrun distances should be determined in the actual application.
2) When testing overrun distance in the actual application, perform
safely, observing your national laws.
3) The brake is specified for operation up to the kinetic energy limit for
the cylinder as shown in the catalogue and indicated in the graph by the
solid line. The brake has the capacity to stop the piston in emergency
situations up to twice the velocity as shown by the dotted line.
3 Installation Warning
Do not install the product unless the safety instructions in the MWB
operation manual have been read and understood. Refer to the MWB
operation manual for details of the installation method and precautions.
3.1 Environment Warning
Do not use in an environment having corrosive gases, chemicals, sea
water, water, water steam, or where there is direct contact with any of
these.
Do not expose to direct sunlight and block the sunlight.
Do not use in a location subject to vibration or impact.
Do not use in a location close to a heat source and exposed to radiant
heat.
Use a suitable cover on the rod, if used in such locations where dust
is present or water or oil may be splashed.
3.2 Piping Caution
Before connecting piping make sure to clean up chips, cutting oil, dust
etc.
When installing piping or fittings, ensure sealant material does not
enter inside the port. When using seal tape, leave 1 thread exposed
on the end of the pipe/fitting.
3.3 Lubrication Caution
SMC products have been lubricated for life at manufacture, and do not
require lubrication in service.
If a lubricant is used in the system, apply the lubricant following
instructions in the MWB catalogue.
3.4 Mounting Caution
Do not apply eccentric load to the piston rod.
Alignment of the centre of gravity of the load and the centre of the
cylinder is necessary. When there is a large amount of misalignment,
eccentric wear or damage of the piston rod can result due to the
moment of inertia caused by the stopping impact when locking.
ORIGINAL INSTRUCTIONS

MWB#-TF2Z418EN
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Avoid: Load centre of gravity and cylinder shaft centre are not matched; however, can be used
if all of the generated moment is absorbed by an effective guide.
Prefer: Load centre of gravity and cylinder shaft centre are matched
Do not scratch or dent the sliding parts of the piston rod.
Damage to the seals may lead to air leakage and locking failure.
Do not apply loads with impact, strong vibration or rotational
force while the lock mechanism is activated.
External impact load, strong vibration or rotating force may break or
reduce the life of lock part.
Prevent seizure of the rotating parts of mounting bracket.
Prevent the seizure of rotating parts (pins, etc.) of mounting brackets
by applying grease.
Do not use the product until you have verified that the equipment
can operate properly.
After installation, apply compressed air and power supplies to the
equipment and perform appropriate functional andleakage inspections
to make sure the equipment is mounted properly.
There is a vent hole on the element. If the ventilation is not
adequate, there will be locking/unlocking delay or operation
failure. Install the cylinder so that the element is not covered.
Keep sufficient distance (10mm or more recommended) away
from the wall.
Lock unit element
3.5 Additional mounting precautions for Lock Unit
1. Ensure that the sliding surface of the rod to be inserted into the
lock unit is not scratched or dented during the mounting or
adjustment of this product.
Scratches or dents on the surface of the rod may cause unusual wear
on the inner surface of the brake pad or decrease its holding force.•
Chamfer the rod end to be inserted into the lock unit as shown in the
figures below to prevent the seal and inner periphery of the lock unit
from being scratched.
3.6 Provisional rod
The provisional rod is used to keep the alignment of the interior
structure stable during delivery. Remove the provisional rod
immediately before mounting into the application. Before this, the
locking unit must be released by compressed air.
3.7 Selection
Warning
1. When in the locked state, do not apply a load accompanied by an
impact shock, strong vibration or turning force, etc.
Use caution, because an external action such as an impacting load,
strong vibration or turning force, may damage the locking mechanism or
reduce its life.
2. Consider stopping accuracy and the amount of overrun when an
intermediate stop is performed.
Due to the nature of a mechanical lock, there is a momentary lag with
respect to the stop signal, and a time delay occurs before stopping. The
cylinder stroke resulting from this delay is the overrun amount. The
difference between the maximum and minimum overrun amounts is the
stopping accuracy.
Place a limit switch before the desired stopping position, at a distance
equal to the overrun amount.
The limit switch must have a detection length (dog length) of the
overrun amount + .
SMC’s auto switches have operating ranges from 8 to 14 mm
(depending on the auto switch model). When the overrun amount
exceeds this range, self-holding of the contact should be performed at
the auto switch load side.
For the stopping accuracy, refer to 2.3 Stopping Accuracy.
3. In order to further improve stopping accuracy, the time from the
stop signal to the operation of the lock should be shortened as
much as possible.
To accomplish this, use a device such as a highly responsive electric
control circuit or solenoid valve, and place the solenoid valve as close as
possible to the cylinder.
4. Note that the stopping accuracy will be influenced by changes in
piston speed.
When piston speed changes during the course of the cylinder stroke due
to variations in the load or disturbances, etc., the dispersion of stopping
positions will increase. Therefore, consideration should be given to
establishing a standard speed for the piston just before it reaches the
stopping position. Moreover, the dispersion of stopping positions will
increase during the cushioned portion of the stroke and during the
accelerating portion of the stroke after the start of operation, due to the
large changes in piston speed.
5. The holding force (max. static load) indicates the maximum
capability to hold a static load without loads, vibration and impact.
This does not indicate a load that can be heldin ordinary conditions.
Select the most suitable bore sizes for the operating conditions in
accordance with the selection procedures explained in MWB catalogue
or operation manual. The Model Selection in the catalogue or operation
manual is based on use at the intermediate stop (including emergency
stop during operation). However, when the cylinder is in a locked state,
kinetic energy does not act upon it. Under these conditions, use the load
mass at the maximum speed (V) of 100 mm/s shown in graphs 5 to 7 on
page 6 of the catalogue depending on the operating pressure and select
models.
3.8 Additional selection precautions (Lock unit specific)
• Use a rod of the size recommended in the following table.
Using any rod other than the rods recommended above may cause
damage to internal parts of the lock unit, faulty mounting of the lock unit,
operation failure, decrease in holding force, etc.
1. The lock unit may be damaged if an excessive lateral load or external
force is applied to it. Fully consider this point.
2. Do not use the lock unit for any application where the rod rotates.
3. When in the locked state, do not apply a load accompanied by an
impact shock, strong vibration, turning force, etc.
Note that an external action, such as an impacting load, strong
vibration, or turning force, may damage the lock unit or reduce its life.
4. Excessively long piping between the unlock port of the lock unit and
the solenoid valve for the lock, or a pipe that is too small may affect the
stopping accuracy of the lock unit.
5. When unlocking is performed from the locked state with some thrust
or load still applied to the lock unit, cylinder lurching may occur. In
addition, frequent occurrence of excessive cylinder lurching or a similar
problem due to the load being applied will damage the lock unit or
reduce its life. Take appropriate measures for the circuit and/or the
system. When using the lock unit in combination with a pneumatic
cylinder, cylinder lurching can be prevented by using a balance circuit,
such as the recommended pneumatic circuits on catalogue page 41.
6. When using the lock unit by placing it in parallel with the cylinder for
driving as shown in the figure below, align the cylinder with the rod.
3.9 Pneumatic Circuit
1. Be certain to use a pneumatic circuit which will apply balancing
pressure to both sides of the piston when in a locked stop.
In order to prevent cylinder lurching after a lock stop, when restarting or
when pneumatically unlocking, a circuit should be used to which will
apply balancing pressure to both sides of the piston, thereby cancelling
the force generated by the load in the direction of piston movement.
2. The effective area of the unlocking solenoid valve should be at
least 50% of the effective area of the cylinder driving solenoid
valve, and it should be installed as close to the cylinder as
possible so that it is closer than the cylinder driving solenoid
valve.
If the effective area of the unlocking solenoid valve is small or if it is
installed at a distance from the cylinder, the time required for
exhausting air for unlocking will be longer, which may cause a delay in
the locking operation.
The delay in the locking operation may result in problems such as
increase of overrunning when performing intermediate stop or
emergency stop during operation, or if maintaining position from the
operation stop state such as drop prevention, workpieces may be
dropped depending on the timing of the load action to the operation
delay of the lock.
3. Avoid backflow of the exhaust pressure when there is a
possibility of interference of exhaust air, for example for a
common exhaust type valve manifold.
The lock may not operate properly when the exhaust air pressure
backflows due to interference of the exhaust air when exhausting air for
lock release. It is recommended to use an individual exhaust type
manifold or individual valves.
4. Allow at least 0.5 seconds from a locked stop (intermediate stop
of the cylinder) until release of the lock.
When the locked stop time is too short, the piston rod (and load) may
lurch at a speed greater than the control speed of the speed controller.
5. When restarting, control the switching signal for the unlocking
solenoid valve so that it acts before or at the same time as the
cylinder drive solenoid valve.
If the signal is delayed, the piston rod (and load) may lurch at a speed
greater than the control speed of the speed controller.
6. Carefully check for dew condensation due to repeated air supply
and exhaust of the locking solenoid valve.
The operating stroke of the lock part is very small. So, if the piping is
long and the air supply and exhaust are repeated, the dew
condensation caused by the adiabatic expansion accumulates in the
lock part. This may corrode internal parts, causing air leak or lock
release fault.
4 Settings
4.1 Adjustment
Warning
Do not open the cushion valve beyond the stopper.
As a retaining mechanism for the cushion valve, a crimped section
(ø32) or retaining ring (ø40 to ø100) is installed, and the cushion valve
should not be opened beyond that point. If not operated in accordance
with the above precautions, the cushion valve may be ejected from the
cover when air pressure is supplied.
Bore size [mm]
Hexagon wrench size of cushion valve
32, 40
2.5
50, 63
3
80, 100
4
Caution
Adjust the cylinder’s air balance.
Balance the load by adjusting the air pressure in the rod and head sides
of the cylinder with the load connected to the cylinder and the lock
released. Lurching of the cylinder when unlocked can be prevented by
carefully adjusting this air balance.
Adjust the mounting positions of the detectors on auto switches,
etc.
When intermediate stops are to be performed, adjust the mounting
positions of detectors on auto switches, etc., taking into consideration
the overrun amount with respect to the desired stopping positions.
5 How to Order
Refer to customer drawing for ‘How to Order’.
Applicable Auto Switches - Refer to MWB catalogue.
6 Outline Dimensions (mm)
Refer to MWB-X3075, MWB-X3246 and MWB-UT-X3075 drawing for
dimensions.
7 Internal Construction
Refer to MWB Catalogue for internal construction drawing.
8 Maintenance
8.1 General Maintenance Caution
Do not disassemble the locking section. Replace the whole locking
unit. If repair is necessary, contact your nearest SMC sales branch.
Consumable parts of the cylinder are replaceable. Use standard
MWB seal kit as shown below;

MWB#-TF2Z418EN
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Tube bore (mm)
Single Rod
32
MWB32-PS
40
MWB40-PS
50
MWB50-PS
63
MWB63-PS
80
MWB80-PS
100
MWB100-PS
For seal kit replacement, firstly remove the rod end nut and unscrew
the bolts which hold the lock unit to the cylinder, using a wrench.
Bore
(mm)
Wrench
Size
Tight.
Torque
[N.m]
32
3
1.35 ~ 1.65
40 ~ 50
5
4.7 ~ 5.7
63
6
11.3 ~ 13.7
80
8
22.1 ~ 26.9
100
10
37.8 ~ 46.2
Remove the lock unit in order to disassemble the cylinder.
To disassemble the cylinder tie-rod nuts, first unscrew the head cover
side using the wrench and torques below;
Bore (mm)
Wrench
Size
Torque
[N.m]
32 ~ 40
6
5.1
50 ~ 63
8
11.0
80 ~ 100
10
25.0
Tighten the tie rods in the order specified above in the table.
Once seals have been replaced, to reassemble follow the instructions
in reverse.
When reassembling the lock unit, temporarily secure the bolts, and
ensure the rod operates smoothly by hand before fully tightening.
Take additional safety measures when conducting maintenance.
9 Troubleshooting
Refer to Troubleshooting in MWB operation manual.
10 Limitations of Use
10.1 Limited warranty and Disclaimer/Compliance Requirements
Refer to Handling Precautions for SMC Products.
Contacts
Refer to www.smcworld.com for contacts.
URL :
http// www.smcworld.com (Global) http// www.smceu.com (Europe)
'SMC Corporation, Akihabara UDX15F, 4-14-1, Sotokanda, Chiyoda-ku, Tokyo 101
0021
Specifications are subject to change without prior notice from the manufacturer.
© 2021 SMC Corporation All Rights Reserved.
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