Soil-tamping device having adaptive drive regulation

Abstract

A tamping device comprises a drive motor which, via a spring mechanism, drives a soil contact element for compacting the soil. A detection device records the speed of rotation of the drive motor. An evaluation device evaluates the dynamic response of the speed of rotation and recognizes an aperiodic response. A control device prompts a change in the speed of rotation of the motor if an aperiodic response has been recognized.

1 . A tamping device comprising:
 a drive motor;   an upper mass which holds the drive motor;   a lower mass which is movably coupled to the upper mass via a spring device and which has a soil contact element for soil compaction;   a movement transmission device for transmitting a drive movement from the drive motor and for generating a periodic movement of the soil contact element;   a detection device for detecting a measurement parameter for the dynamic response of at least one component of the tamping device;   an evaluation device for evaluating the dynamic response and for identifying an aperiodic response; and   an indicator device for indicating that an aperiodic response is identified by the evaluation device.   
     
     
         2 . The tamping device as recited in  claim 1 , wherein
 rules are stored in the evaluation device for defining action recommendations for a user, such as changing the rotation speed of the drive motor, in order to reduce the aperiodic response;   an action recommendation is selected by the evaluation device as a function of the identified aperiodic response; and wherein   the selected action recommendation is indicated by the indicator device.   
     
     
         3 . A tamping device, comprising:
 a drive motor;   an upper mass which holds the drive motor;   a lower mass which is movably coupled to the upper mass via a spring device and which has a soil contact element for soil compaction;   a movement transmission device for transmitting a drive movement from the drive motor and for generating a periodic movement of the soil contact element;   a detection device for detecting a measurement parameter for the dynamic response of at least one component of the tamping device;   an evaluation device for evaluating the dynamic response and for identifying an aperiodic response; and   a control device for changing at least one dynamic parameter of at least one of the components of the tamping device when an aperiodic response is identified by the evaluation device.   
     
     
         4 . The tamping device as claimed in  claim 3 , further comprising an indicator device for indicating that an aperiodic response is identified by the evaluation device. 
     
     
         5 . The tamping device as claimed in  claim 1 , wherein the measurement parameter is selected from the group consisting of:
 a rotational speed of the drive motor;   load surges on a motor shaft of the drive motor;   a rotational speed of the movement transmission device;   a movement response of the component in question;   a relative movement between the upper mass and the lower mass;   an acceleration of the component in question;   an acceleration of the upper mass;   an acceleration of the lower mass;   an acceleration of a guide handle which is mounted on the upper mass and   a rotational angle between the guide handle and the upper mass.   
     
     
         6 . The tamping device as claimed in  claim 1 , wherein the dynamic parameter is selected from the group comprising:
 a rotational speed of the drive motor;   a torque of the drive motor;   a spring stiffness of the spring device between the upper mass and the lower mass;   damping properties of a damping device which is arranged between the upper mass and the lower mass,   an oscillation amplitude of the soil contact element; and   an oscillation frequency of the soil contact element.   
     
     
         7 . The tamping device as claimed in  claim 1 , wherein an aperiodic response is identified when the measurement parameter deviates from an ideally periodic response by a predefined amount. 
     
     
         8 . The tamping device as claimed in  claim 1 , wherein:
 the drive motor is a gasoline engine; and   a rotational speed, which can be changed as the dynamic parameter, is a rated or limit rotation speed.   
     
     
         9 . The tamping device as claimed in  claim 8 , wherein:
 the gasoline engine has a characteristic map-controlled ignition device; and wherein   the rotational speed of the gasoline engine has to be kept constant substantially at the value of the rated or limit rotation speed by the ignition device, with the aid of a variation in a ignition time.   
     
     
         10 . The tamping device as claimed in  claim 1 , wherein the control device is formed in such a way that the rotation speed of the drive motor is changed in accordance with predefined rules when an aperiodic response of the motor shaft is identified. 
     
     
         11 . The tamping device as claimed in  claim 1 , wherein at least one of the following are stored as rules in the evaluation device:
 prespecifications for taking a predefined control measure when an aperiodic response occurs;   characteristic curves;   characteristic maps; and   predefined operating points on characteristic curves or characteristic maps.   
     
     
         12 . The tamping device as claimed in  claim 3 , wherein the measurement parameter is selected from the group consisting of:
 a rotational speed of the drive motor;   load surges on a motor shaft of the drive motor;   a rotational speed of the movement transmission device;   a movement response of the component in question;   a relative movement between the upper mass and the lower mass;   an acceleration of the component in question;   an acceleration of the upper mass;   an acceleration of the lower mass;   an acceleration of a guide handle which is mounted on the upper mass and   a rotational angle between the guide handle and the upper mass.   
     
     
         13 . The tamping device as claimed in  claim 3 , wherein the dynamic parameter is selected from the group consisting of:
 a rotational speed of the drive motor;   a torque of the drive motor;   a spring stiffness of the spring device between the upper mass and the lower mass;   damping properties of a damping device which is arranged between the upper mass and the lower mass,   an oscillation amplitude of the soil contact element; and   an oscillation frequency of the soil contact element.   
     
     
         14 . The tamping device as claimed in  claim 3 , wherein an aperiodic response is identified when the measurement parameter deviates from an ideally periodic response by a predefined amount. 
     
     
         15 . The tamping device as claimed in  claim 3 , wherein:
 the drive motor is a gasoline engine; and wherein   the rotational speed, which can be changed as the dynamic parameter, is a rated or limit rotational speed.