• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The mechanism has hydraulic rocker cylinders (10, 20) carrying out a rocking movement of a crane cantilever arm. A pressure sensor (30) monitors a function of a hydraulic cylinder of the rocker cylinders. The sensor is arranged as per the rocker cylinders in such a manner that the pressure is measured on a piston surface of the rocker cylinders. The sensor is arranged in the mechanism such that the pressure in a region of a piston rod of the rocker cylinders is measured. A communication unit forwards sensor data to a local or central receiving and/or controlling unit. An independent claim is also included for a crane comprising a logic unit.
    公开号:NL2006337A
    申请号:NL2006337
    申请日:2011-03-03
    公开日:2011-09-06
    发明作者:Markus Burger
    申请人:Liebherr Werk Nenzing；
    IPC主号:
    专利说明:

    Crane rocker device and crane
    The present invention relates to a rocker device for a crane with at least one hydraulic rocker cylinder for performing a rocker movement of a crane arm. The invention further relates to a crane with such a rocking device.
    A crane, the arm of which can be rocked around a horizontal rocker axis, generally has a rocking device mounted on the superstructure for performing a rocking movement of the crane arm about a horizontal rocking axis. In addition to the known technical operation of the rocker device by means of a rocker winch and traction rope, there is also the possibility of effecting the rocker movement of the arm by means of a hydraulic rocker system.
    The hydraulic system of the rocker device consists of at least one hydraulic rocker cylinder, the relative movement of which between piston and cylinder body causes the rocker movement of the arm. In order to guarantee the reliability of the crane, in particular the reliability of the crane's arm system, the hydraulic rocker system must be tested and maintained at regular distances in leaky places or other sources of error. So far, the investigations of the rocker have been carried out by a trained person skilled in the art, who checks the essential components of the rocker for their functionality.
    The object of the present invention is to show a person skilled in the art a solution direction that enables the automatic monitoring or control of the hydraulic rocker device in a rocker-mounted crane arm system.
    This object is achieved by a rocker device according to the features of claim 1. A rocker rocker device is therefore presented, which consists of at least one hydraulic rocker cylinder for performing a rocker movement of a crane arm. According to the invention, one or more monitoring means in the form of sensors, in particular in the form of pressure sensors, are arranged in or on at least one rocker cylinder, which perform a monitoring of the hydraulic function of the rocker device. The sensors enable continuous monitoring of the hydraulic function and signal faulty functions in the hydraulic system under certain circumstances. By way of example, internal leakages in the cylinder body, in particular between the piston surface and the ring surface of the cylinder body, can be detected and diagnosed.
    The sensors check preferably defined operating parameters in the hydraulic system of the rocker.
    The rocker cylinders are preferably designed as differential cylinders in a manner known per se. Primarily, the use of the pressure sensors allows the registration of the hydraulic pressure in the cylinder body and therefore the recognition of internal leaks in the cylinder body, in particular between piston surface and ring surface. For this purpose, at least one sensor per rocker cylinder is advantageously arranged in such a way that the hydraulic pressure on the piston surface of the rocker cylinder can be measured. A hydraulic rocker with at least two identical hydraulic rocker cylinders arranged parallel to each other has, under normal operating conditions, identical pressure ratios on the piston surfaces of the rocker cylinder, if no rocking movement of the arm system is performed. The attachment of at least one sensor per rocker cylinder allows the determination of the pressure difference of the prevailing hydraulic pressures in the area of the piston surfaces of the rocker cylinders. Too large a deviation makes an incorrect function in the rocker cylinder obvious.
    It is also conceivable that at least one sensor is arranged such that the hydraulic pressure in the area of the piston rod of at least one rocker cylinder can be measured. The pressure measurement in the region of the piston rod of at least one rocker cylinder serves to recognize possible leaks in the sealing package at the head of the cylinder body, in particular in the exit and entry area of the piston rod in the cylinder bodies. Because the respective pressure ranges around the piston rods, i.e. the ring surfaces of the rocker cylinders, are preferably coupled to each other in the hydraulic system, a single sensor is effective for all rocker cylinders. Of course, one rocker sensor for the pressure measurement in the area of the ring surfaces in the cylinder body can of course always be provided.
    For assessing the recorded measurement data, there is preferably provided at least one communication means, which collects the individual measurement values from the sensors used and transmits them to a local and / or central receiving and / or control unit. It is conceivable that the communication means performs a first error analysis and possibly has a pointing means for signaling an occurring error. Alternatively, it may be provided that the communication means serves solely for forwarding the measurement data to a central control unit. By way of example, the communication means of the rocker device can be coupled to a central bus system of a crane.
    The present invention further relates to a crane with a rockable arm as well as a rocking device according to one of the above-mentioned characteristics for effecting the rocking movement of the arm.
    In a particularly preferred embodiment of the crane according to the invention, it provides a crane control with an implemented logic for monitoring the rocker device by means of the recorded sensor data. The sensor values, in particular the measurement values that characterize the hydraulic pressure in the rocker cylinder, can be transmitted to the crane control by means of the communication means of the rocker device and analyzed on the basis of the implemented logic.
    Advantageously, the logic of the crane control provides means for comparing one or more sensor values of the rocker with one or several reference values. The reference values are advantageously stored in the control and characterize the correct operating parameters of the rocker. Due to the comparator of the crane control logic, deviations between the recorded measured values and the prescribed operating values can be determined, and an error diagnosis for locating the error can also be set up.
    In a possible embodiment of the invention, the crane control logic has a means for calculating the difference between two or more sensor values. As a result, differences between the pressure values in the area of the piston surfaces of the rocker cylinders can be determined. The calculated difference is preferably by comparing the comparator with a stored reference value. If the difference value or measured value has a deviation from the reference value that exceeds or exceeds a tolerable range, then an error diagnosis takes place and further targeted measures can be taken by the crane controller.
    For displaying the monitoring function of the rocker device, the crane expediently has at least one indicating means. This serves, for example, for displaying the recorded sensor measurement values of the rocker, or for issuing any error messages and / or status messages from the crane control logic.
    A storage of the recorded measurement values or the analysis results for later assessment is also possible.
    Further advantages and details of the invention are elucidated with reference to the following exemplary embodiment and the accompanying image.
    The only figure shows the hydraulic circuit for a possible embodiment of the crane according to the invention with a hydraulic rocker. The hydraulic rocking device consists of the identical rocking cylinders 10, 20, which are connected in parallel in the hydraulic circuit. The hydraulic pump 1 serves to adjust the hydraulic pressure, in particular in the area of the piston surfaces 11, 21 of the rocker cylinders 10, 20, which is connected to the rocker cylinders 10, 20 via the valve arrangement 2. A pressure change in the hydraulic circuit by means of the pump 1 changes the force which acts on the piston surfaces 11, 21 of the rocker cylinders 10, 20, whereby a rocking movement of the crane arm about its horizontal rocker axis is effected.
    For measuring the hydraulic pressure on the piston surfaces 11, 21 of the rocker cylinders 10, 20, one pressure sensor 30, 40 per rocker cylinder 10, 20 is always provided. In the embodiment of the figure, the pressure sensor 30 registers the hydraulic pressure force which acts on the piston surface 11 of the rocker cylinder 10 and the pressure sensor 40 the pressure force on the piston surface 21 of the rocker cylinder 20. The prevailing pressure in the area of the ring surfaces 12, 22 of the rocker cylinders 10, 20 is recorded by the single pressure sensor 50. Because the ring surfaces 12, 22 of the rocker cylinders 10, 20 are coupled to each other in the hydraulic circuit, the use of a single pressure sensor 50 for measuring the hydraulic pressure prevailing there is sufficient.
    For the assessment of the measurement results, the sensor data from the pressure sensors 30, 40, 50 are transmitted to a crane control (not shown) by means of the communication means. For the analysis of the data or for the establishment of an error diagnosis, the crane control provides a logic implemented for the rocker, which has a comparator. The two pressure sensors 30, 40 continuously measure the prevailing pressure in the area of the piston surfaces 11,12 of the rocker cylinders 10, 20 and transmit this to the comparator of the crane control. After receiving the data, this calculates the measurement difference and compares the determined difference value with a reference value stored in the crane control. Ideally, identical pressure ratios prevail in the area of the piston surfaces in the identical rocking cylinders 10, 20 as long as the rocking device does not perform a rocking movement. The stored reference value indicates a tolerable deviation between the pressure ratios of the two rocker cylinders 10, 20. If the calculated difference exceeds the stored reference value, an error behavior in the rocker is recognized by the logic of the crane control and possibly delivered via an indicating means. The excessive deviation of the pressure difference can be traced either to a faulty behavior of the check valve or to a leak in the seal between piston and ring surface in one of the rocker cylinders 10, 20. The error message triggered by the crane control can be issued via an indicating means, or alternatively or additionally stored in a memory provided for this purpose of the crane control as an error protocol. Furthermore, the specified error message calls on the crane operator to secure or set down the hanging load and to set the operation of the crane to correct the error.
    On the basis of the measured values of the pressure sensor 50, a possibly non-sealed location in the sealing package at the head of the cylinder body, in particular in the entry and exit areas of the piston rod of the rocker cylinders 10, 20, can be discovered. The recorded measured value of the pressure sensor 50 is also sent to the tap control and compared by the comparator with a stored reference value. If the measured pressure of the pressure sensor 50 falls below the corresponding reference value, then a leak in the cylinder head sealing package of one of the rocker cylinders 10, 20 is diagnosed. As a consequence, the crane control also generates an error message, which is issued via the pointing device of the crane control. Under certain circumstances, error recognition triggers targeted control measures of the crane control.
    The present invention enables automatic and continuous monitoring of the hydraulic rocker for the first time. By installing the sensor system and the associated programming of the crane control, existing cranes can be equipped particularly easily. The logic of the crane control also enables reliable error recognition as well as error diagnosis in the rocker device, as a result of which suitable measures for solving errors can be taken particularly quickly, automatically or manually. This leads to a significant increase in operational reliability with cranes with rocker arm systems.
    权利要求:
    Claims (9)
    [1]
    Clamping device for a crane with at least one hydraulic rocker cylinder for performing a rocking movement of a crane arm, characterized in that at least one sensor, in particular a pressure sensor, is provided for monitoring the hydraulic cylinder function of at least one one rocker cylinder.
    [2]
    Rocker device according to claim 1, characterized in that at least one sensor per rocker cylinder is arranged such that the pressure on the piston surface of the rocker cylinder can be measured.
    [3]
    Rocker device according to claim 1 or 2, characterized in that at least one sensor is arranged in the rocker device such that the pressure in the area of the piston rod of at least one rocker cylinder can be measured.
    [4]
    Rocker device according to one of claims 1 to 3, characterized in that a communication means is provided for transmitting the sensor data to a local or central receiving or control unit.
    [5]
    Crane with a rocker arm and a rocker device according to one of claims 1 to 4.
    [6]
    Crane according to claim 5, characterized in that a crane control with an implemented logic is provided for monitoring the rocker device by means of the registered sensor data.
    [7]
    Crane according to claim 6, characterized in that the logic has means for comparing one or more sensor values of the rocker with one or more reference values.
    [8]
    Faucet according to one of claims 6 or 7, characterized in that the logic has means for calculating the difference between two or more sensor values.
    [9]
    Crane according to one of claims 5 to 8, characterized in that the crane or the crane control has indicating means for displaying the sensor data of the rocker and / or for issuing error messages and / or status messages.
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    同族专利:
    公开号 | 公开日
    NL2006337C2|2012-05-15|
    DE102010010386B4|2014-11-20|
    NO20110345A1|2011-09-06|
    DE102010010386A1|2011-09-08|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP0007816A1|1978-08-02|1980-02-06|Eaton Corporation|Method and apparatus for aiding the operation of a crane|
    JPH07285787A|1994-04-20|1995-10-31|Furukawa Co Ltd|Overload preventing device for crane|
    WO1997016371A1|1995-11-02|1997-05-09|Lars Bruun|Arrangement for a crane|
    AT203488T|1998-09-08|2001-08-15|Palfinger Ag|CRANE|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102010010386.1A|DE102010010386B4|2010-03-05|2010-03-05|Device and method for monitoring a crane luffing work and crane|
    DE102010010386|2010-03-05|
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