DSH screw jack
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DSH screw jack Product description DSH screw jack Conventional screw jack applications consist of one or more screw jacks. Usually they are driven by one electric motor and typically connected via drive shafts or couplings resulting in efficiency losses within the drive train. Screw jacks fitted with worm/wormwheel or bevel gear sets often reach their maximum limit when operating with high duty cycles or high linear speeds. These are two of the main reasons for the development of our new quiet and efficient lifting system. After a long development program with the supprt of local universities the new DSH screw jack has been created. The INKOMA-DSH screw jacks have no internal gear system. Instead a special Torque motor is used to directly drive the ballscrew spindle resulting in smooth backlash free rotation. In the DSH system there are virtually no mechanical losses. Specially selected bearings ensure the spindle can withstand both tensile and compressive loads. The compact drive unit has a rigid construction and is suitable for high dynamic applications. Cycle times of 7 cycles per second and lifting speeds of 32m/min are achievable. Repeatable positioning accuracy is also very high. The DSH-units can be synchronised when working together within a system, allowing the screw jacks to be positioned at different levels within the application. The DSH-system has high energy efficiency. During operation the torque motor is used to control the speed and hold position of the ballscrew spindle. An integrated brake is also available for increased safety. The spindle can be mounted on either side of the DSH unit. The DSH unit is available with a complete control system (Siemens system used on standard version). Alternatively other manufacturers equipment can also be specified. In addition to the basic versions, customer specific executions are also possible e.g. spindle diameter, spindle pitch, mounting dimensions. Please contact us with your special requirements.

Contents list DSH screw jacks with rotating spindle and translating spindle Technical information requirements, advantages and application areas comparison between DSH and HSG lifting units Selection DSH screw jack selection of the DSH and the spindle (pitch) ball screw spindle, ball screw spindle, flanged nut to DIN 69051 for ball screw spindle accessories for rotating version (R)

DSH screw jack Versions Rotating and translating spindle Two versions exist: • Rotating version • Translating version For both versions ballscrew spindles (KGS) are used. In rotating version (R) the ballscrew spindle is fixed in the rotor of the DSH-unit. Linear motion of the nut results from rotation of the spindle. In translating version (S) linear lifting motion results from the movement of the non rotating spindle through a special rotating integral nut. The spindle is guided through the DSH unit and must not be allowed to rotate. This can be done by customers design, e.g. with a guide....

DSH screw jack Technical information Requirements, advantages and application areas Requirements for the DSH-system • Fast cycle times and high duty applications (e.g. testing machines, packaging machines, printing machines) • High lifting speed with large lifting forces (e.g. machine tools, woodworking machines, special purpose machines) • Large centre distances between spindles and different height levels between lifting units (e.g. entertainment equipment, theatre lifting system) • Backlash free and repeatable high positional accuracy (e.g. testing machines, machine tools, printing...

DSH screw jack Technical information Comparison between DSH and HSG lifting units Conventional screw jack application (HSG) For applications with different height levels between lifting units and when using conventional screw jacks like our HSG range, it is usually necessary to use bevel gearboxes and cardan shafts to connect each screw jack and transmit torque. This method may cause backlash to be present within the system and can mean that all of the scew jacks are not moving at the same time and therefore accurate parallel lifting of the load is not possible. DSH -System The DSH units...

DSH screw jack Selection DSH screw jack Method: 1. Preselection of the DSH-unit with the max. static lifting load Fstat. (see page 09/11) 2. Selection of the DSH and the spindle (pitch) with the graph (see page 07) See example shown below right. DSH- testing machine Explanations of the graphs: The graphs are valid for air cooled motors. The lifting force and lifting speed are dependent on the duty cycle. The duty ED [%/h] is derived from the time in operation (lifting and lowering) and the inactive time between successive operations Total cycle time Example for the duty cycle Explanation of...

DSH screw jack Selection Selection of the DSH and the spindle (pitch) DSH-1 lifting speed [m/min] lifting speed [m/min] lifting speed [m/min] lifting speed [m/min] lifting speed [m/min] Attention! The graphs are using theoretical and sampled data. It is necessary to use a suitable safety factor. Please do not hesiste to contact our Technical Sales Staff should you need assistance with product selection and design with the lifting system.

DSH screw jack Dimensions DSH-1 - DSH-5 Ball screw spindle, translating version (SA, SVA) Versions: Translating spindle with travel limiter Translating spindle with rotation prevention and travel limiter OB: without additional brake MB: with additional brake see page 15 Ordering example: DSH screw jack Size 3 Translating spindle with rotation prevention and travel limiter Stroke 100 mm Ball screw / size Without additional brake

DSH screw jack max. static load 1) Effective load Order code specification of the max. lifting force is only a guide to enable pre-selection of the inital DSH-size. The actual dynamic lifting force possible is dependant upon the operating conditions. 2) Higher lifting speeds are available on request. 3) The rated speeds are valid for an operating duty of 20%/h. Higher duty cycles are possible but are dependant upon the application, and additional cooling the DSH-unit may be required. Dimensions [mm] Order code