Cilindros autoblocantes y de freno

PVS (Pneumatic/Air/Light Hydraulic)

PVS Style Self-Locking Cylinders are commonly used for applications using air. Often the PVS model replaces or substitutes for more costly hydraulic systems. The solid metal-on-metal lock allows for high loading without the “squish” associated with standard air cylinders.

HYS (Heavy Hydraulic)

HYS Style Self-Locking Cylinders are commonly used for applications where high moving forces are required. HYS is the perfect choice in applications where holding during loss of pressure is critical.  The Heavy Hydraulic style may be operated pneumatically in some applications. Consult PFA for details.

Accommodation of Locking Clearance / Overtravel

Self-Locking Cylinders must fully extend to lock at the end of stroke.  In many applications, the lock point is not restricted and the cylinder fully extends and locks.  In other applications, a more precise lockup window is desirable and may be obtained with simple stops and shims.

To ensure locking, the cylinders are manufactured with .004” to .013” of overtravel (end play) beyond the seating lock position. When pressure is removed or load applied after a locked condition is achieved, the rod will backup or move until the clearance is taken up. The overtravel clearance may be eliminated by adjusting load position at the rod-to-load interface. Consult a PFA Applications Specialist for details.

How it works

As the cylinder reaches end-of-stroke, the tri-sectional ring (A), is forced into the annular groove (B) in the rod by the locking slide (“C”). The locking slide is held in place by the bias springs and will maintain lock-up until pressure is applied to the retract port. The retract port supplies pressure to move the locking slide off the three locking segments and to retract the rod at the same time.

Simplified Circuit/Sequence-Vertical movement

To support the vertical load and remove force on the lock prior to unlocking and lowering (with possible multiple speeds).

1. Valve “CD” is recommended in vertical applications to prevent uncontrolled dropping or movement of the load due to gravity when unlocked.
2. ENSURE LOAD IS GUIDED INDEPENDENTLY from the cylinder rod in vertical applications.
3. Energize solenoid (C) to lift/support the load off of the locking mechanism.
4. Leave (C) energized while energizing (A) to unlock the locking Mechanism (lock sensor off).
5. De-energize (C) to lower load at speed set at (FC1).
6. Energize (D) to lower load at higher speed based on parallel (combined) flow thru (FC1) and (FC3).
7. Energize (B) to lift the load with speed based on (FC2). At full extend the cylinder will lock (sensor on to verify lock).

 

Simplified Circuit/Sequence-Horizontal Movement

To allow for more simple horizontal cylinder operation.

1. Valve “CD” is not needed in the horizontal application, IF the lock is NOT under load during unlocking. However, if the lock IS under load during unlocking, then follow the Vertical movement method.
2. ENSURE LOAD IS SUPPORTED INDEPENDENTLY from the cylinder rod in a horizontal application.
3. With no load on the lock, Energize A to unlock and retract at speed set by (FC1).
4. Energize (B) to extend the load at speed set at (FC2).

Lock-on-Extend (LOE) Theoretical Performance Data

* Heavy Hydraulic Style may be operated pneumatically in some applications. Consult PFA for details.
** Cylinder locking / holding force is a function of rod column strength and depends on overall stroke length and proper load guidance/installation.

*Q dimension replaces K dimension for MF2–Rear Flange Mount only

Instructions:

Each end of the cylinder has four positions for ports (P), sensors (S), cushion adjustments (C), and mountings (MS2, MS4 use a position).
Catalog drawings show standard ports “on top” in position (1) and standard mounts “on the bottom” in position (3). Mounts MF1, MF2, and MP1 are oriented as shown in the drawings relative to position (1) “on top.”

NOTE: NO ADDITIONAL ORDER CODE IS REQUIRED TO OBTAIN THE STANDARD ORIENTATION.

When an alternate locations are desired for Ports, Cushions, Mounts, or Sensors, use the Figure above to select positions, remembering that each position can have only one option. Add the three character code(s) to the part number for each option. Sensors are all solid state, Normally Open style, available in 20-250 VAC/DC (load only) [-XAC] and 10-65 VDC [PNP]. PNP is recommended for most PLC type applications.

Note: Other mounting options and mating accessories are available. Please contact PFA for details on your specific application.

PVS (Pneumatic/Air/Light Hydraulic)

PVS Style Self-Locking Cylinders are commonly used for applications using air. Often the PVS model replaces or substitutes for more costly hydraulic systems. The solid metal-on-metal lock allows for high loading without the “squish” associated with standard air cylinders.

HYS (Heavy Hydraulic)

HYS Style Self-Locking Cylinders are commonly used for applications where high moving forces are required. HYS is the perfect choice in applications where holding during loss of pressure is critical.

Accommodation of Locking Clearance / Overtravel

Self-Locking Cylinders must fully retract to lock at the end of stroke. In many applications, the lock point is not restricted and the cylinder fully extends and locks. In other applications, a more precise lockup window is desirable and may be obtained with simple stops and shims.

To ensure locking, the cylinders are manufactured with .004” to .013” of overtravel (end play) beyond the seating lock position. When pressure is removed or load applied after a locked condition is achieved, the rod will backup or move until the clearance is taken up. The overtravel clearance may be eliminated by adjusting load position at the rod-to-load interface. Consult a PFA Applications Specialist for details.

How it works

As the cylinder reaches end-of-stroke, the rod engages a keeper slide allowing the tri-sectional ring (D), to be forced into the annular groove (E) by the locking slide (F). The locking slide is held in place by the bias springs and will maintain lock-up until pressure is applied to the extend port. The extend port supplies pressure to move the locking slide off the three locking segments and to extend the rod at the same time.

Simplified Circuit/Sequence-Vertical movement

To support the vertical load and remove force on the lock prior to unlocking and lowering (with possible multiple speeds).

1. Valve “CD” is recommended in vertical applications to prevent uncontrolled dropping or movement of the load due to gravity when unlocked.
2. ENSURE LOAD IS GUIDED INDEPENDENTLY from the cylinder rod in vertical applications.
3. Energize solenoid (C) to lift/support the load off of the locking mechanism.
4. Leave (C) energized while energizing (A) to unlock the locking Mechanism (lock sensor off).
5. De-energize (C) to lower load at speed set at (FC1).
6. Energize (D) to lower load at higher speed based on parallel (combined) flow thru (FC1) and (FC3).
7. Energize (B) to lift the load with speed based on (FC2). At full retract the cylinder will lock (sensor on to verify lock).

 

Simplified Circuit/Sequence-Horizontal Movement

To allow for more simple horizontal cylinder operation.

1. Valve “CD” is not needed in the horizontal application, IF the lock is NOT under load during unlocking. However, if the lock IS under load during unlocking, then follow use the Vertical application method above.
2. ENSURE LOAD IS SUPPORTED INDEPENDENTLY from the cylinder rod in a horizontal application.
3. With no load on the lock, Energize A to unlock and extend at speed set by (FC1).
4. Energize (B) to retract the load at speed set at (FC2).

Lock-on-Retract (LOR) Theoretical Performance Data

* Heavy Hydraulic Style may be operated pneumatically in some applications. Consult PFA for details.
** Cylinder locking / holding force is a function of rod column strength and depends on overall stroke length and proper load guidance/installation.

*Q dimension replaces K dimension for MF2–Rear Flange Mount only

Instructions:

Each end of the cylinder has four positions for ports (P), sensors (S), cushion adjustments (C), and mountings (MS2, MS4 use a position).
Catalog drawings show standard ports “on top” in position (1) and standard mounts “on the bottom” in position (3). Mounts MF1, MF2, and MP1 are oriented as shown in the drawings relative to position (1) “on top.”

NOTE: NO ADDITIONAL ORDER CODE IS REQUIRED TO OBTAIN THE STANDARD ORIENTATION.

When an alternate locations are desired for Ports, Cushions, Mounts, or Sensors, use the Figure above to select positions, remembering that each position can have only one option. Add the three character code(s) to the part number for each option. Sensors are all solid state, Normally Open style, available in 20-250 VAC/DC (load only) [-XAC] and 10-65 VDC [PNP]. PNP is recommended for most PLC type applications.

Note: Other mounting options and mating accessories are available. Please contact PFA for details on your specific application.

Advantages

The KPS braking cylinder will automatically engage the brake if air pressure is lost, making it valuable in applications where avoiding potential damage to machinery is a priority.
With the braking action taking place inside the rod, there is no risk of damaging the outside of the rod, which may lead to seal failure in other products.
Since the KPS brake is adjustable, a great degree of control is achievable to facilitate highly complex applications.

How it works

As the cylinder reaches the desired position, air pressure is released from the brake piston (G), allowing the springs (J) to expand and pull the brake cone (K) to engage the brake (L). The brake holds the rod in place until pressure is applied to the brake port and the springs are compressed releasing the brake.

General Specifications

Note: General specifications apply to standard KPS cylinders. Certain aspects of the KPS cylinder may be customized to accommodate individual applications. Please contact PFA for application assistance.

Simplified Circuit/Sequence-Vertical Movement

To support the vertical load and remove force on the brake prior to unbraking and lowering or raising the load. NOTE: BRAKE is ON when ZERO PRESSURE at Brake Port. Applying pressure disengages brake.

1. Very careful control of the pneumatics is needed in vertical applications to prevent uncontrolled dropping or movement of the load due to gravity when brake is disengaged.
2. ENSURE LOAD IS GUIDED INDEPENDENTLY from the cylinder rod in vertical applications.
3. With solenoid (C) in the normal position the load is supported and the braking mechanism holds position. SUPPLIED PRESSURE SHOULD BE REGULATED AND SET TO EXCEED THE WEIGHT OF THE LOAD SO THE LOAD LIFTS AT ALL TIMES.
4. Energize (A) to pressurize the brake ports and disengage the brake (load may lift).
5. Maintain (A) energized and Energize(C) or energize (B) to retract the load at the speed set at flow control or energize (B) to power load downward at a higher pressure (preferred).

 

Simplified Circuit/Sequence-Horizontal Movement

To allow for more simple horizontal cylinder operation.

1. Valve (B) would be setup in the same arrangement as (C) so air is constantly supplied to both sides of the piston at pressures determined to balance the piston areas and have nearly no movement.
2. ENSURE LOAD IS SUPPORTED INDEPENDENTLY from the cylinder rod in a horizontal application.
3. With no load on the brake (balanced), Energize A to disengage the brake.
4. Maintain (A) energized and Energize(C) to extend the load at speed set a Flow Control on valve C (meter out), or energize (B) to retract the load at the speed set at Flow Control on valve B.

Braking Cylinders Theoretical Performance Data

* Holding forces are approximate and based on factory settings using clean, dry air. Customer can vary the holding force by following adjustment procedures provided with the product.

Note:  Other mounting options and mating accessories are available.  Please contact PFA for details on your specific application.

For Lock-On-Extend cylinders the sensor closest to the rod end, also called the “front or forward sensor” senses the lock itself and can only be activated when the rod is fully extended and the lock is engaged. As the cylinder cannot lock until in the fully extended position, the front sensor acts as both a lock verification sensor and extended verification sensor.
The sensor closest to the opposite end (blind end), also called the “rear or back sensor” senses the piston and can only be activated when the Lock-On-Extend cylinder is in the fully retracted position.

The sensor locations can be in any of four locations around the outside of the cylinder, but cannot be co-located with a cushion adjustment (cushion location), port location, or mount location (if applicable). Positions are noted as front location then rear location, and then quadrant clockwise from the top position 1 when looking down the rod toward the cylinder. For a Lock-On-Extend cylinder with Lock sensor only, specify “S” for “Sensor” then position 1,2,3, or 4 for location on the front, and then 0 for the rear location, where zero stands for none. Typically we recommend to stay with the default recommendations of Ports in position 1, Cushions in position 2, and Sensors in Positon 4. For example P11-C22-S44.

Examples for Lock-On-Extend sensors:

Front Locking Sensor Only: SX0 S10, S20, S30, S40
Rear Position Sensor Only: S0X S01, S02, S03, S04
Both Sensors: S11, S12, S13, S14, S21, S22, …. S44

Specifications

For Lock-On-Retract cylinders the sensor on the blind end (farthest from the rod end), also called the “rear or back sensor”, senses the lock itself and can only be activated when the rod is fully retracted and the lock is engaged. As the cylinder cannot lock until in the fully retracted position, the rear sensor acts as both a lock verification sensor and retract verification sensor.
The sensor closest to the rod end, also called the “front or forward sensor” senses the piston and can only be activated when the Lock-On-Retract cylinder is in the fully extended position.

The sensor locations can be in any of four locations around the outside of the cylinder, but cannot be co-located with a cushion adjustment (cushion location), port location, or mount location (if applicable). Positions are noted as front location then rear location, and then quadrant clockwise from the top position 1 when looking down the rod toward the cylinder. For a Lock-On-Retract cylinder with Lock sensor only, specify “S” for “Sensor” then 0 for the front location, where zero stands for none, and then position 1,2,3, or 4 for location on the rear. Typically we recommend to stay with the default recommendations of Ports in position 1, Cushions in position 2, and Sensors in Positon 4. For example P11-C22-S44 (See page 13).

Examples for Lock-On-Retract sensors:

Front Position Sensor Only: SX0 S10, S20, S30, S40
Rear Locking Sensor Only: S0X S01, S02, S03, S04
Both Sensors: S11, S12, S13, S14, S21, S22, …. S44

Specifications

PFA proporciona APOYO GRATUITO EN LA REVISIÓN DE APLICACIONESy modelos CAD 3D paramétricos en asociación con CADENAS Part Solutions.  Por favor, revise las siguientes recomendaciones y descargue su archivo CAD.

NOTA: todos los dominios de “correo gratuito” como gmail, yahoo, hotmail, etc. están bloqueados y no se pueden usar para recibir descargas.  Utilice una cuenta de correo electrónico corporativo cuando inicie sesión en el configurador de CADENAS Part Solutions.

NEW Users – Forgot Password – Login and Email domain Hints

All “free-mail” domains such as Gmail, Yahoo, Hotmail, etc. are blocked due to SPAM related issues and cannot be used to receive CAD file downloads.  Please use a corporate email account when logging into the configurator.

New user registration, updating registration, and password reset may result in the system opening a new browser tab.  After completing login or password reset, a new page may load with generic information.  Please close the new tab and proceed by clicking “OK” on the original tab behind it. If the page looks unfamiliar or confusing, please reload the page and reenter the product parameters.  We are working to improve the new user experience with CADENAS and apologize for any confusion.  Please contact PFA for assistance.

FREE Application Review Support

Our Applications Specialists have reviewed thousands of applications. Let our experience work for you! Please contact us early in the design process or email your concept to discuss recommended options.  We can open 2D and 3D files in a wide variety of formats. Typically we will not have a problem opening any file format, however, STEP files seem to be the most versatile.

We will provide our recommendations for size and lock holding capacity, and point out any possible limitations of the proposed design affecting proper performance.  While the designer is responsible for understanding and selecting the correct product, we are very happy to help optimize that process.

Entering 3D Model Information  – Download Instructions:

Parametric 3D Models and 2D CAD Files are available in about 100 native formats, by partnering with CADENAS Part Solutions.   In the table below is a menu on the left and image pane for the model on the right.    For a better understanding of dimensions, See the Dimensional Information on our website – Lock on Extend (LOE) dimensional information section or Lock on Retract (LOR) dimensional information section. For additional information on selecting CAD file options, help for specific CAD systems, or more details on how to use the configurator, please see instruction below.  For additional information on selecting CAD file options, help for specific CAD systems, or more details on how to use the configurator, please see help in the instructions below.

Selecting Product Information – After reviewing the PFA sizing methods and recommendations, select all the options for the Self-Locking cylinder desired and accessories needed:

• Bore Size – Select Piston Diameter/Bore size
• Series  – Select PVS (pneumatic) or HYS (hydraulic).
• Lock Position – Lock-On Extend (LOE) or Lock-On Retract (LOR)
• Stroke – Enter Stroke length to .001” (between .1” and 50”)
• Mount – Select Mounting Option
• Rod End – Select SM, IM, or SF
• High Temp Seals Option – For applications where contact or the environment exceeds 200 F add High Temp Seals.
• Select Port Position for front and rear locations – 1 is on top.  See Dimensions page for how to determine position.
• Cushion Adjustment Options – Select Cushions for Without (none), Front, Rear, or Both.
• Cushion for front and rear locations – For cushion select location. See Dimensions page for how to determine position.
• Sensor Options – Select Sensors for Without (none), Front, Rear, or Both.
• Stroke Position – Sets the Rod Extended or Retracted when the model is created.
• Sensor Type – Note that sensors look the same whether ACX or PNP.  Please remember to specify when ordering.

Preview Tab and Update  – Select “Update Preview” in the center of the image area.  The model will be created and can be rotated by clicking and holding while moving the mouse as is typical in many CAD systems.  The small menu on the upper left and various action buttons on the bottom can be used to gain various impressions of the model and some dimensions. New accessories may be selected and new models generated. Selecting the Dimensions Tab in the image window will bring up 2D layouts.  The letters on the drawings reference dimensions shown on the left below the selectable options.

CAD Download Tab – Click on the CAD Download Tab on the upper left of the window and then the Generate CAD button. If you are a returning customer and remember passwords, login to continue or the system may log you in automatically.  Click on the Generate CAD button to load the current configuration after login.  The system will remember your CAD model file type, but if you are a new user or have not downloaded files recently, it may prompt for details on your CAD system or require accepting new user terms (seen below).  Select the “Edit CAD Formats” link on the bottom right next to your email or the small menu box next to the Generate CAD button to change file formats.

New Users/Forgot Password/Free Email Domains – New user registration, updating registration, and password reset may result in the system opening a new browser tab.  After completing login or password reset, a new page may load with generic information.  Please close the new tab and proceed by clicking “OK” on the original tab behind it. If the page looks unfamiliar or confusing, please reload the page and reenter the product parameters.  We are working to improve the new user experience with CADENAS and apologize for any confusion.  Please contact PFA for assistance.

Reminder, all “free-mail” domains such as Gmail, Yahoo, Hotmail, etc. are blocked due to SPAM related issues and cannot be used to receive CAD file downloads.  Please use a corporate email account when logging into the configurator.

CAD File Download –   After selecting the correct file type and selecting Generate CAD, an image of a cylinder and part number file name should appear in the center of the window.  Please allow time for the file to generate.  Select Information to view the file type information, Download, or Delete to update parameters.  (See Help below for additional information on special file types to determine if additional advice, downloads, or support is needed for using the files).

Help – Most files are simple and downloads easy to import, however for those interested in advanced features or for those using CATIA (CATIA Support) and SolidWorks (SolidWorks Support), viewing the help files is recommended to ensure smooth and successful results.  Configurator Help reviews items that affect the ability to operate the online viewer and what file types are available.  Typically customers have a smooth experience, however, the configurator does require that JAVA (Chrome and Firefox) is installed and enabled and will prompt for the installation of Active X if not installed.  Different browsers may require other plug-ins, such as Chrome (Chrome Plug-In).  Please try these recommended solutions on the CADENAS Part Solutions Main Support Page or call PFA for assistance.