Technical Data Sheet TI-F52 Locking Unit KFHL Certified by Lloyd s Register
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1 English translation of German original TI-F52 Locking Unit KFHL Certified by Lloyd s Register For a detailed functional description refer to Technical Information TI-F10. Further important practical advice is given in Operating Manual BA-F52. The Locking Unit KFHL clamps a shaft in any position. It is commonly used on a cylinder rod or an other round shaft and holds axial forces in both directions. The KFHL builds on the success of the SITEMA Locking Unit KFH in a specific way, as it has been developed to satisfy the particular requirements associated with maritime applications. Design measures have been adopted to ensure equipment is able to function safely, even under the difficult conditions experienced, for example, on the open sea. Among other measures, this is achieved by choosing suitable materials and a high level of corrosion protection for the clamping system. Additional sealing and a special encapsulation of the proximity switches prevent intrusion of sea water. SITEMA has placed particular emphasis on ensuring an adequate safety margin in terms of achievable clamping forces. The SITEMA Locking Unit KFHL makes a clear distinction between admissible load and holding force. The admissible load in kn denotes the maximum load that can be applied to a SITEMA Locking Unit KFHL. The actual holding force is twice as high and corresponds to the safety margin required by Lloyd's Register EMEA for the purposes of personal safety. T2 X +0,2 øz H8 Load direction 1 Load direction 2 ød f7/h6 ød L1 G L LL T see 1 Alternative port: see 4 pressure compensation HL H1 H2 H Rod diameter 18 mm - 40 mm 3x x Proximity switch port: 1 Signal load secured Proximity switch port: 2 Signal released Fig. 1: Dimensions Locking Unit KFHL (CAD-files download at 1 M is the admissible force the mass to be secured exerts on the Locking Unit KFHL. The holding (braking) force when delivered from factory is not less than 2 x M, but will not exceed 4 x M. p is the pressure required for releasing. The permissible working pressure is 160 bar. 2 Hydraulic operating volume Type Ident.-No. d M p D H L1 T2 G Z X VL HL H1 H2 Weight mm kn bar mm mm mm mm mm mm mm mm cm 3 mm mm mm kg KFHL 18 KFHL M G1/ ,5 5 KFHL 25 KFHL M G1/ , KFHL 28 KFHL KFHL 32 KFHL M G1/ ,5 77,5 17 KFHL 36 KFHL KFHL 40 KFHL M G1/ , Subject to modification without prior notice 3 Proximity switch holders are provided with standard proximity switches M8x1 with a nominal switching distance of 1.5 mm (flush mountable), pressure-resistant up to 10 bar and with a fixed cable of 30.5 mm length (e.g. BALLUFF BES SA17-05 ). 4 Plugged hydraulic port LL alternative to L, also useful for bleeding. 1/5
2 TI-F52 Locking Unit KFHL Certified by Lloyd s Register For a detailed functional description refer to Technical Information TI-F10. Further important practical advice is given in Operating Manual BA-F52. T2 T1 X +0,2 øz H8 Load direction 1 Load direction 2 ød f7/h6 ød L1 G L LL T see 1 Alternative port: see 4 pressure compensation HL H1 H2 Rod diameter 45 mm mm H 3x x Proximity switch port: 1 Signal load secured Proximity switch port: 2 Signal released Fig. 2: Dimensions Locking Unit KFHL (CAD-files download at Type Ident.-No. d M p D H L1 T1 T2 G Z X VL HL H1 H2 Weight mm kn bar mm mm mm mm mm mm mm mm mm cm 3 mm mm mm kg KFHL 45 KFHL KFHL 50 KFHL M G1/ KFHL 56 KFHL KFHL 60 KFHL M G1/ ,5 115,5 106,5 57 KFHL 70 KFHL KFHL 80 KFHL M G1/ KFHL 90 KFHL KFHL 100 KFHL M G3/ , KFHL 125 KFHL M G3/ , Subject to modification without prior notice 1 M is the admissible force the mass to be secured exerts on the Locking Unit KFHL. The holding (braking) force when delivered from factory is not less than 2 x M, but will not exceed 4 x M. p is the pressure required for releasing. The permissible working pressure is 160 bar. 2 Hydraulic operating volume. 3 Proximity switch holders are provided with standard proximity switches M8x1 with a nominal switching distance of 1.5 mm (flush mountable), pressure-resistant up to 10 bar and with a fixed cable of 30.5 mm length (e.g. BALLUFF BES SA17-05 ). 4 Plugged hydraulic port LL alternative to L, also useful for bleeding. 2/5
3 Choosing the right size The table shows the admissible load M of the various types. The value of M must be higher than the maximum axial force acting on the rod. The holding force of the Locking Unit KFHL is not less than 2 x M according to the requirements of the Safety Authorities. Ports T for pressure compensation / oil filling Internal volume changes during switching are compensated at ports T. For protection against corrosion, the unit is designed to be filled / flushed with oil. One of the ports T has to be connected to the hydraulic tank with a pressureless pipe. The other port T can be used to fill / flush the unit or has to be closed with a screw plug. A certain overpressure caused by height differences between tank and unit is admissible (approx. 1 bar). Higher pressure at ports T is not allowed, as it may lead to dysfunctions of the Locking Unit KFHL or to leakage. Design and attachment of the rod The Locking Unit KFHL will operate correctly only if the rod has a suitable surface: ISO tolerance field f7 or h6 Surface roughness: Rz = 1 to 4 µm Rod surface hardened (min. HRC 56) Lead-in chamfer min. 3x20, rounded An additional hard chrome plating 20 +/- 10 µm, HV is recommended. The following rod qualities are widely available and suitable: 1. Piston rods, hard chrome plated (ISO tolerance f7) Basic material: yield strength min. 580 N/mm² Induction hardened HRC 56-64, min. depth 1 mm Hard chrome plating: HV, min. depth 13 µm Surface finish: Ra 0,15-0,25 µm 2. Shafts for linear ball bearings (ISO tolerance h6) Induction hardened HRC > 60 Surface finish: Ra 0,15-0,25 mm The actual holding force of the Locking Unit KFHS is higher than the admissible load indicated in the data sheets and drawings, but will not be higher than four times this value. Therefore, all fixation elements carrying the load (rod, its attachment, etc.) have to be dimensioned for 4 x M. Please note that at dynamic loads (e.g. when braking), the full holding force (4 x M) can occur. Generally, the basic rod material has to have sufficient yield strength. In the case of compression-loaded rods, sufficient buckling resistance must be assured. Pressure fluid Hydraulic oil (HLP) in accordance with DIN must be used as pressure medium. Please consult SITEMA before using any other media. Control In most applications, an actuation as suggested in the sketch below is used. During every operational cycle, the 3/2-way valve is actuated electrically and releases the locking unit. In all other operational conditions including power failure, emergency stop etc., the locking unit engages and holds the rod or brakes the load. Likewise, the load is secured when the pressure line breaks. To prevent possible problems, the rod shall not be driven unless proximity switch 2 indicates the signal released. p *) **) Fig. 3: Schematic diagram of hydraulic circuit * In case impact noises due to excess pressure are audible when pressurizing the Locking Unit KFHL, these can be suppressed by means of a flow control valve in the p-line. ** In case the pressure is not sufficiently constant (e.g. pressure drop at the beginning of a downward stroke), we recommend a check valve in the p-connection of the valve. Under no circumstances must the hydraulic flow between port L and the tank be impaired by any additional components. If a particular quick response of the Locking Unit KFHL is required, the following preconditions must be met: Short piping distances large valve and pipe cross-sections fast valve response times appropriate control 3/5
4 Monitoring by proximity switches Proximity switch 1 "load secured" indicates the secure state and is used to authorise entrance to the danger area. Switch 2 "released" is used to activate the downward movement of the drive. For an automatic detection of failures, both signals are compared. In case both switches indicate the same state - apart from a short overlapping period - a dysfunction is present. Operating conditions The Locking Unit KFHL is principally designed for outdoor use. By connecting the T-ports to the tank, opperating at maritime conditions is possible. In case of heavy soiling conditions or extreme temperature, please contact SITEMA. Grease on the rod may reduce the holding force. Regular functional checks The Locking Unit KFHL must be functionally checked at regular intervals. Regular checking is the only way to ensure that the unit will operate safely in the long run. Please see the operation manual for further details. Required risk assessment It must be ensured that the dimensions and arrangement of a SITEMA Locking Unit KFHL used in safety-relevant applications meet the requirements of the risk evaluation DIN EN ISO 12100: and also comply with any further standards and regulations applicable for the intended use. The Locking Unit KFHL alone principally cannot form a complete safety solution. It is however suitable to be part of such a solution. Furthermore, all attachments and fixations have to be dimensioned correspondingly. This is generally the duty of the system manufacturer and the user. Type approval certficate The SITEMA Locking Unit KFHL has been tested and approved by Lloyd's Register. For further details to this Type Approval Certificate please see page 5. According to Lloyd s regulations, in additon to the type approval certificate all individual units have to be certified by an Lloyd's official in our factory. Maintenance Maintenance is limited to the regular test of the holding force as prescribed above. The Locking Unit KFHL is a safety element. Any repair or refurbishing must be carried out by SITEMA. SITEMA cannot take any responsibility for repairs by another party. 4/5
5 Type Approval Certificate 5/5
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