EP0487725B1 - Appareil d'affichage de l'elevation du crochet d'une grue et methode de determination - Google Patents

Appareil d'affichage de l'elevation du crochet d'une grue et methode de determination Download PDF

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Publication number
EP0487725B1
EP0487725B1 EP90909368A EP90909368A EP0487725B1 EP 0487725 B1 EP0487725 B1 EP 0487725B1 EP 90909368 A EP90909368 A EP 90909368A EP 90909368 A EP90909368 A EP 90909368A EP 0487725 B1 EP0487725 B1 EP 0487725B1
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EP
European Patent Office
Prior art keywords
crane
rope
hook structure
boom
hook
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EP90909368A
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German (de)
English (en)
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EP0487725A1 (fr
EP0487725A4 (en
Inventor
Akinori Ichiba
Yukio Tsutsumi
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Kato Works Co Ltd
Kato Seisakusho Co Ltd
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Kato Works Co Ltd
Kato Seisakusho Co Ltd
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Priority to AT90909368T priority Critical patent/ATE134358T1/de
Publication of EP0487725A1 publication Critical patent/EP0487725A1/fr
Publication of EP0487725A4 publication Critical patent/EP0487725A4/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/18—Control systems or devices
    • B66C13/46—Position indicators for suspended loads or for crane elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/88—Safety gear
    • B66C23/90—Devices for indicating or limiting lifting moment

Definitions

  • the present invention relates to an apparatus for calculating and displaying a crane hook lifting distance.
  • a crane safety apparatus has been proposed (in Japanese Patent Publication No.56-47117) in which various operation parameters (such as boom length, boom angle, outrigger extension, and jibbing) of a crane are detected by sensors, a digital memory storing rated loads for various operation states determined by the specification of the crane is accessed to retrieve the rated load specific to the detected operation parameters, the retrieved rated load is compared with the actual load, and warning is issued when the actual load reaches a value near the rated load or the crane is automatically stopped when the actual load reaches the rated load.
  • various operation parameters such as boom length, boom angle, outrigger extension, and jibbing
  • a conventional crane safety apparatus does not have a function of correctly indicating a hook lifting distance.
  • the hook lifting distance is known from the present state of the hook structure.
  • an apparatus has not been proposed which schematially displays a hook structure on a display within a target or operation range fixedly set by an operator, and allows the operator to monitor the hoisting and lowering operation of the hook structure.
  • JP-A-5430754 describes a system for detecting the extension length of a hook rope.
  • a wheel is rotated which drives potentiometers, one of which is selected according to an operation selector switch, for forming an output signal.
  • JP-A-5823883 shows an indicator panel on which a crane pattern picture is displayed. Indicators are aligned on the panel so as to correspond to the crane pattern, so that a user can visually ascertain the quantity represented by the data displayed on the panel.
  • the invention provides a method for determining a crane hook lifting distance (L-l) by obtaining a maximum lifting distance (L) in accordance with a preset crane mechanism setting, and obtaining a hanging length (l) of a hook structure hung by a rope from a boom of the crane mechanism, said method characterised by: detecting shifting movement of the rope over a predetermined time interval; determining rope extension as an accumulated value of rope shift distances; determining the hanging length (1) in accordance with the accumulated value of shift distances; detecting when the hook structure reaches an overhoist position corresponding to a maximum lifting position; and resetting the accumulated value when the hook structure is detected at the overhoist position.
  • the invention provides apparatus for determining a crane hook lifting distance (L-l) by obtaining a maximum lifting distance L in accordance with a preset crane mechanism setting, and obtaining a hanging length l of a hook structure hung by a rope from a boom of the crane mechanism, said apparatus characterised by: means for detecting shifting movement of the rope over a predetermined time interval in order to obtain a rope extension amount as an accumulated value of rope shift distances; means for determining the hanging length (l) in accordance with the accumulated value of rope shift distances; and means for resetting the accumulated value when the hook structure is detected at an overhoist position corresponding to a maximum lifting position.
  • an apparatus for displaying the hook lifting distance or hook structure position calculated by the above method or apparatus together with an operation range limit pattern, on a display screen.
  • a crane operator can place the hook structure on an actual target position and pushes a key. Then, the target position is set to the reference point (e.g., 0) fixedly displayed on the screen. The actual distance between the target and hook structure is displayed on the screen in correspondence with the distance on the screen between the schematic hook structure graphic image and reference point.
  • the fundamental structure of a crane safety apparatus is shown in Fig.1A.
  • the apparatus is constructed of a main unit A and a display unit B.
  • a main unit CPU and a display unit CPU always exchange commands and data.
  • a crane operation state (such as the number of outrigger stages, and the number of jib stages) is set at the display unit.
  • An operator selects an operation state setting mode from a plurality of display modes displayed on a display B'', by manipulating a predetermined key in a setting key group.
  • the display unit has a memory which stores the operation state setting mode display as graphics data.
  • CPU reads the display data in accordance with a display control program in ROM, and writes the data in a video RAM to display a display mode graphic image on the display B''.
  • Data such as the number of outrigger stages set by the operator using a setting key is fetched by the display unit CPU.
  • the display unit CPU modifies the display mode graphic image in accordance with the setting data, and sends the setting data to the main unit A as data D B , to thereafter complete the settings for the operation state mode.
  • the operator selects a monitor mode necessary for the crane operation, and reads the display data from the memory to display it on the screen.
  • the main unit A receives the crane operation state setting data D B sent from the display unit B, and fetches from a sensor group A' operation parameter data (boom length 1, boom angle 8, swing angle ⁇ , rope extension amount, jib offset angle, and the like) representative of the state of the crane mechanism changing from time to time as the crane is operated.
  • the operation parameter data is, directly or after processed by CPU, sent to the display unit B as data D A .
  • the display unit B modifies the display data on the display B'' from time to time so that the present operation state of the crane can be monitored as a schematic graphic image.
  • the main unit A stores data determined by the specification of the crane. Typical data is maximum rated loads at various crane operation states. For example, Fig.1B shows rated load data curves under the operation state settings of a middle outrigger (5.9 m), extension (side), and no jib, with the boom length of 8.9 m. Rated total load curves of the crane are determined for each of various operation state settings and boom lengths. Such a great amount of data is stored in ROM of the main unit A.
  • the main unit A accesses the maximum rated load data stored in ROM corresponding to the crane operation state at that time.
  • the maximum rated load data obtained or processed is compared with an actual load. If the present crane operation state is within a danger range, the main unit sends a signal for controlling the crane mechanism A'' so that warning is issued and/or the crane is automatically stopped.
  • the memory of the display unit B stores a plurality of display data for a plurality of display modes.
  • a desired display mode is selected from a plurality of display modes including a hook lifting display mode by using a setting key.
  • An operator can set the operation state and monitor the crane operation while referring to the display mode graphic image on the screen including the above-described and conventionally used automatic crane safety monitor mode graphic image.
  • the main unit A and display unit B run on their own programs. Transfer of commands and data between the main unit A and display unit B is carried out by an interrupt process.
  • the main unit CPU 200 is inputted with actual load data from a pressure sensor 201, and other crane operator parameter data from a swing angle sensor 202, boom length sensor 203, boom angle sensor 204, boom overground top angle sensor 205, jib overground angle sensor 206, wire rope extension amount sensor 207, and pressure sensor 208 respectively mounted on various positions of the crane mechanism.
  • the data from the sensors 205 to 208 at the boom top is collected at a top terminal 209, and sent to a cord reel 210 at the boom bottom via optical fibers.
  • the data is then converted into electric signals which are sent to the main unit CPU 200.
  • the display unit CPU 211 is powered by the main unit CPU 200 via lines 217.
  • a display 212 is a matrix type, dynamically driven liquid crystal display (LCD). LCD is more preferable from the viewpoint of easy-to-monitor than CRT, LED, plasma display and the like because a crane is generally used outdoors and exposed to strong light. LCD 212 is back-lighted in the night.
  • the setting key switch group has a plurality of touch keys corresponding to a plurality of setting items. Signals for controlling the crane mechanism are outputted to plungers 218, electromagnetic valves and the like.
  • a crane main frame 31 is supported by a fixedly mounted outrigger.
  • the main unit CPU 200 mounted within an operation cabinet of the crane main frame.
  • the sensors are mounted on the crane mechanism at predetermined positions.
  • a hook structure 34 is hung by a wire rope 33 from the top of a boom 32.
  • the hook structure 34 is hoisted or lowered when the rope 33 is wound about or released from a winch 35.
  • a jib 37 is additionally mounted.
  • An overhoist sensor 36 or 38 detects that the hook structure 34 was hoisted to the position lower than the top of the boom by a predetermined distance (overhoist length), and causes the winch-hoisting to automatically stop in order to prevent collision of the hook structure against the boom top.
  • the predetermined distance from the boom top and hook structure is called an overhoist length which takes a value specific to the crane mechanism.
  • the overground height of the hook structure at the overhoist length is a maximum lifting distance.
  • Hook lifting distance maximum lifting distance - (rope extension amount - rope extension amount caused by boom length shift - rope extension amount caused by jib offset angle shift)/number of ropes on hook
  • the maximum lifting distance is the length between the position (overhoist position) lower than the boom or jib top by the predetermined distance) and ground.
  • This maximum lifting distance is calculated by the main unit CPU 200 shown in Fig.2 in accordance with the setting state of the boom and jib measured with the various sensor.
  • a pulse type rope extension amount sensor 39 is mounted on the boom at the upper position thereof. Specifically, each time the rope moves by a predetermined distance, the sensor 39 generates one pulse which is supplied to the main unit CPU 200. The main unit CPU 200 forms therein a software up/down counter to count pulses from the sensor.
  • the up/down counter is switched to an up counter when an operation lever is manipulated to cause the winch 35 to lower the hook structure, and to a down counter when it is manipulated to cause the winch 35 to hoist the hook structure.
  • the sensor 36 detects that the hook structure 34 is at the overhoist position, it outputs a signal in response to which the up/down counter is automatically reset to "0".
  • the rope extension amount i.e., rope winding or releasing amount, is determined using as a reference the state that the hook structure 34 is at the overhoist position.
  • One or more ropes are extended from the boom or jib top to the hook structure 34.
  • the rope length from the overhoist position to the hook structure 34 can be calculated by dividing the rope length by the number of ropes.
  • Data from the various sensors 201 to 208 and setting switch key group 213 shown in Fig.2 is supplied from the display unit CPU 211 to the main unit CPU 200 to calculate the hook lifting distance.
  • the amount of winding the wire rope about or releasing it from the winch is not given as an absolute value, but it is given as a relative rope extension amount from the reference position by the pulse sensor 207.
  • This relative rope extension amount is supplied to the main unit CPU 200.
  • the overhoist position sensor 36 or 38 detects that the hook structure is overhoist at the boom angle 30° or more and stays above the overhoist position several seconds or more and then the overhoist state is released. This overhoist position is used as the reference position for calculating the rope extension amount caused by the rope winding or releasing.
  • the reason why the overhoist position of the hook structure is used as the reference position is that this position can be easily set under any condition with less error.
  • the reason why the boom angle is set to 30° or more is that it is preferable to determine the reference position at the running state (normally the boom angle is set to 30° or less) of the crane. The reference position is therefore set immediately after starting crane operation.
  • the reason of introducing the condition that the hook structure stays several seconds or more, is to exclude the case where the hook structure swings and becomes in contact with the overhoist sensor.
  • the software register within CPU 200 may sometimes store "+3" for example instead of "0" as the rope extension amount.
  • the register is automatically reset to "0". Namely, the reference position is automatically renewed to eliminate the accumulated error.
  • the crane safety apparatus uses the hook lifting distance calculated by CPU 200, in the following manner.
  • the hook lifting distance calculated at a predetermined time period is supplied to the display unit CPU 211.
  • the display unit CPU 211 After setting the operation state mode, the display unit CPU 211 automatically enters an automatic crane safety monitor mode for displaying a graphic image such as shown in Fig.6. In accordance with the information supplied from the main unit CPU 200, the display unit CPU 211 displays the present crane operation state, including an outrigger setting 604, swing position 605, operation radius 606, boom angle 607, lifting load 610, hook lifting 609, boom length 602, and maximum lifting 614.
  • the boom length is schematically shown as an expansion bar 603.
  • the present crane operation state is indicated by a bar graph 611 showing the safety limit of the crane.
  • the numerical value representing the safety is indicated at 613.
  • a limit (maximum) load for a given crane operation state is numerically shown at 608.
  • the present crane operation state is monitored by the main CPU 200 using data from the various sensors.
  • the main unit CPU 200 accesses the memory to retrieve the maximum load for the crane operation state at that time and checks whether the actual load is equal to or less than the maximum load.
  • the main unit CPU 200 outputs a signal for locking the crane operation mechanism when the actual load becomes the maximum load of the crane operation at that time.
  • similar warning and automatic stop are effected by the display unit CPU 211 not only when the actual load becomes the maximum load but alto when the actual operation range enters the limit operation range set by the operator.
  • One of the unique graphic images of this embodiment is an automatic stop cause 612.
  • an automatic stop cause 612. When the crane is automatically stopped during the automatic crane safety monitor mode, it is difficult for an operator to quickly locate the cause of the automatic stop. It is difficult to locate the cause particularly when the crane is tumbled down or broken due to an overload or when the crane operation range is set in the monitor mode. If the rope having a predetermined length is wound in an idle state in excess of the rope length during the crane operation, a reverse winding will occur. Even in such a case, an automatic stop is carried out and its cause is illustratively shown at 612.
  • the display unit CPU Upon actuation of the mode selection key, the display unit CPU enters the target mode showing a graphic image such as shown in Fig.7.
  • the target mode is used when an operator sitting on the seat cannot see a hanging load.
  • Target index marks 705 and 706 indicated by solid lines in Fig.7 are used for setting two target points on the horizontal plane.
  • One side of the innermost target index mark corresponds to an actual distance of 15 cm in the radial direction, that of the next mark corresponds to 40 cm, and that of the outermost mark corresponds to 60 cm.
  • the sides correspond respectively to +/- 5°, +/-10°, and +/- 15° in the circumferential direction.
  • Indices 715 and 716 indicate the lifting distance of the hook structure in the vertical direction of the two target points in the horizontal plan.
  • a mark 718 represents the overhoist position
  • a mark 719 represents the target position (0 point) in the vertical direction
  • a mark 717 represents the actual position of the hook structure.
  • a hanging load is placed at the target position in the vertical and horizontal directions by operating the crane, and then the setting key is actuated to set the target position as the first target.
  • the target position is set as the 0 point of the coordinate system.
  • the position of the hanging load in the horizontal plane is displayed on the target index mark display area as a distance from the 0 point.
  • the target position of the hook structure in the vertical direction corresponds to the mark 719, and the actual position of the hook structure is indicated by the mark 717.
  • the crane operation often includes an operation of moving a hanging load from the first point to second point by swinging the boom.
  • the target index marks 705 and 716 are used for setting the first point
  • the target index marks 706 and 716 are used for setting the second point.
  • the index marks 705 and 715, and the index marks 706 and 716 are used for displaying different and independent coordinate systems.
  • the two sets of index marks 705 and 715, and 706 and 716 show the effective display area of the coordinate systems of the first and second points, and correspond to the actual size, e.g., of 100 cm square.
  • a hanging load within the effective area is represented by a mark.
  • the mark moves onto a broken line as indicated at 707 so that the operator can know the direction of the hanging load. While referring to the mark displayed relative to the target index mark, the operator can carry out repetitive operations of moving the hanging load between the first and second points in the horizontal and vertical directions, even if the operator cannot visually confirm the actual position of the hanging load.
  • Distance of the hanging load to the first and second points in the horizontal and vertical directions are displayed at the upper area of the display screen at 703 and 704. Displayed for convenience sake at the lower left of the display screen area an outrigger setting 709 and a boom swing position 708. Displayed for reference sake are a load 712 and a maximum load 711.
  • Reference numeral 701 represents a mode
  • reference numeral 702 represents a numerical value of safety degree.
  • An actual hanging load position is calculated by the main unit CPU from data of the various sensors and crane setting data, and is given to the display unit CPU as the hanging load position data and crane lifting distance.
  • the display unit CPU sets the lifting position data at that time as the 0 point of the index marks 705 and 715.
  • an overground distance (hook lifting distance) display mode is switchably provided wherein the lower area of the index 715 is displayed in different color.
  • the overhoist position distance display mode the upper area of the index 715 is displayed in different color.
  • the index 7115 is used for displaying the primary hoisting hook structure position
  • the index 716 is used for the sub-hoisting hook structure position (refer to Fig.8).
  • the symbols representing the hook structure in the indices 715 and 716 display a difference between the positions of the primary hoisting and sub-hoisting. For example, if the primary hoisting hook is higher than the sub-hoisting hook by 1 m, then the symbol of the primary hoisting hook is displayed higher than the middle position of the index. In this case, the hooks are made horizontal by hoisting the primary hoisting hook or by lowering the sub-hoisting hook.
  • preset is the operation range of the hook structure within which the hook structure and hanging load do not become in contact with nearby building or the like. If the boom or rope extension exceeds the preset range, warning is issued or the crane is automatically stopped.
  • graphic images such as shown in Fig.9 and 10 are displayed. The boom and jib are illustrated at A on the display screen and the position of the hook structure is indicated at F. This graphical illustration changes as the crane moves.
  • setting the operation limit of the hook structure an operator moves the hook structure with an actual lifting load to limit points (upper and lower limits).
  • Fig.9 illustrates the absolute upper and lower limit positions of the hook structure.
  • Fig.10 illustrates the limits of distance of the hook structure from the overhoist position near the boom or jib top.
  • the limit lines U and L are changed and displayed correspondingly. While monitoring such graphic illustrations, a crane operator manages the F mark not to move outside of the limit range.
  • the hook structure In setting the limit range, the hook structure is actually moved to the limit points and the setting key is actuated at that time. This setting is carried out not by entering limit values an operator determined, but by actually moving the hook structure. This setting is advantageous in that the operation range can be set by actually moving the hook structure on site.
  • the operation sequence of the apparatus according to the embodiment of the present invention is controlled by programs independently running on the main unit and display unit CPUs.
  • the main unit CPU receives the operation parameters from the various sensors and the operation range setting data from the display unit CPU, calculates the actual load, operation range radius, limit load, maximum lifting distance, hook lifting distance, and the like, automatically stops the crane mechanism, and sends the data to the display unit CPU.
  • the display unit CPU displays a graphic image of the selected mode in accordance with the data from the main unit CPU, modifies the graphic image in accordance with the data inputted from setting keys, and transmits the inputted setting data to the main unit CPU.
  • the sequences of the main unit and display unit CPUs run independently from each other, while transferring commands and data upon occurrence of an interrupt.
  • Programs for sequence control of the main unit and display unit CPUs are stored in ROM.
  • the display unit has a video RAM which stores display graphic data of a selected display mode. The contents of the graphic data are modified as the crane operation state changes.
  • the graphic data in the video RAM is transferred to the display at an interval of 150 ms for example to update the graphic image.
  • Data D A and D B are transferred between the main unit and display unit by start-stop synchronization of data communication.
  • the main unit CPU receives a transmission request interrupt to transmit data.
  • the display unit then receives a reception request interrupt to receive the data.
  • Data is transmitted from the display unit and received by the main unit in a similar manner.
  • Data from the various sensors representative of the crane operation state is received by the main unit CPU via an A/D converter.
  • the main unit CPU reads the sensor data.
  • a key input at the display unit is checked at a predetermined cycle to execute the process suitable for a depressed key.
  • a timer interrupt is received by the main unit and display unit CPUs to execute a process at a predetermined time interval.
  • the display unit CPU writes graphic data in the video RAM in accordance with the data received at the display unit to display a graphic image, and supplies the operation limit setting data and the like to the main unit.
  • the main unit CPU calculates a boom radius, lifting distance, actual load, and limit load in accordance with the data received at the main unit, compares them with the performance data defined by the crane specification, and outputs a control signal for automatically stopping the crane and other control signals.
  • the main unit In response to powering or resetting the apparatus, the main unit performs the main flow sequence at steps S 1a to S 6a .
  • the first step S 1as checks whether the apparatus is in a proper state and initializes the CPU settings for achieving the proper execution at the following steps. Prior to this initializing, an interrupt is inhibited, and after completion of the initializing, an interrupt inhibition is released at step S 2a .
  • step S 3a it is checked whether data to be transmitted to the display or data received from the display is present. If present, the data is subjected to transmission/reception. Data transmitted to the main unit is received upon execution of a hardware interrupt similar to the case of receiving data from sensors.
  • step S 4a various calculation processes are executed for the received and processed data. Specifically, parameters representative of the crane operation state including an actual load, boom radius, maximum lifting distance, hook lifting distance, and the like are obtained from data such as a boom length, boom angle, pressure, rope extension amount, and the like. A limit load is obtained from the parameters and a preset limit load data defined by the crane specification.
  • step S 5a the safety degree of the crane operation is calculated from the results obtained at the step S 4a , the crane operation state is compared with the operation limit value, and an automatic stop process is executed by generating a stop signal if the crane operation state is in the danger range or over the operation limit.
  • the main unit CPU enters a stop (HALT) state at step S 6a .
  • a hardware interrupt request (IREQ) for receiving data is received from the external component
  • the main unit CPU in the stop state executes the interrupt process and thereafter returns to the loop start point. If there is no hardware interrupt, the main unit CPU remains at step S 6a .
  • a hardware interrupt is set between step S 6a and the loop start point, this interrupt may be set at a desired point in the sequence at steps S 3a to S 6a .
  • data reception at the main unit and data transmission to the display unit are activated by an interrupt. After transmission/reception of new data, the data is processed and the automatic stop process is executed.
  • Fig.12 shows the main flow of the display unit.
  • the first step S 1b initializes the display unit CPU settings for achieving the proper execution at the following steps.
  • an interrupt inhibition is released.
  • the graphic image for the crane operation state is first written in the video RAM.
  • the graphic image data is read from the video RAM at a predetermined time interval, e.g., 150 ms and displayed on the display. In this manner, the contents of the graphic image on the display are updated at the interval of 150 ms.
  • coordinate values of each line segment constituting an image are stored as the graphic image data. If a display update flag is being set at step S 3b , then at step S 4b the graphic image data is transferred from the video RAM to the display to update the displayed image.
  • the initial display data stored in the video RAM set at step S 1b is displayed. Thereafter, CPU enters in a stop (HALT) state at step S 5b and maintains as it is until a hardware interrupt is received.
  • HALT stop
  • a hardware interrupt to the display unit CPU includes a timer interrupt and a data transmission/reception interrupt relative to the main unit CPU.
  • the display unit CPU transmits or receives the data for a given type of hardware interrupt.
  • a process for a selected mode is executed at step S 6b .
  • a graphic image for the selected mode is written in the video RAM in accordance with new data. This process for a selected mode is activated always by a hardware interrupt.
  • a hardware interrupt is allowed also during this graphic image processing, but it is not allowed during a short time period while a hardware interrupt is processed.
  • the updated graphic image in the video RAM is displayed on the display at steps S 3b and S 4b .
  • Calculation of a hook lifting distance by CPU 200 is carried out by the routine shown in Fig.13 which is activated at a predetermined time interval.
  • the pulse sensor generates a pulse each time the rope is extended by a predetermined amount.
  • the count in the counter buffer is read as a new pulse number.
  • the new pulse number is subtracted from an old pulse number read at the previous count time and stored in a software register.
  • the resultant pulse count is the number of pulses generated during the period from the previous count time and present count time as the rope is extended. If the resultant pulse count is 0 at step S 3c , it means that the rope was not extended during this period.
  • the rope shift distance is set to 0 at step S 4c . If the pulse count is not 0, at step S 5c the new pulse number is replaced by the old pulse number stored in the software register. At step S 6c , the rope shift distance is calculated from (pulse count) ⁇ (rope extension amount per one pulse). At step S 7c it is checked if the winch lever is for winding or releasing. If not winding, at step S 8c the present rope extension amount is obtained by adding this rope shift distance to an old rope extension amount calculated at the previous count time and stored in a software register. If winding, at step S 9c the present rope extension amount is obtained by subtracting this rope shift distance from the old rope extension amount. This present rope extension amount is replaced by the old rope extension amount stored in the software register.
  • a boom length shift amount is obtained by subtracting the old boom length detected at the previous count time from the present boom length.
  • the rope extension amount obtained at step S 8c or S 9c is subtracted by the rope extension amount corresponding to the boom length shift amount and by the rope extension amount corresponding to the jib offset angle shift.
  • the resultant rope extension amount is divided by the number or ropes on hook to obtain m representing the rope length hanging down from the overhoist position described before. Therefore, the hook lifting distance is obtained at step S 11c by subtracting m from the maximum lifting distance calculated from the crane operation state.
  • an interrupt routine shown in Fig.14 starts running.
  • step S 1d it is checked if the boom angle is 30° or more. If lower than 30°, the timer is reset at step S 2d .
  • step S 3d if 30° or more and the timer is not operating (that the timer is operating means that the overhoist position sensor was turned on and its process is being executed), the timer is caused to start at step S 3d .
  • an interrupt routine shown in Fig.15 starts to forcibly reset to 0 the rope extension amount calculated by the process shown in Fig.13 and stored in the software register.
  • the reference point for the rope extension amount is automatically modified. If the hook structure moves away from the overhoist position and the sensor turns off before time-out of the timer, the timer is reset by an interrupt routine shown in Fig.16 at step S 12f . Namely, only when the hook structure remains at the overhoist position during the predetermined time period, the reference point of the rope extension amount is modified.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Control And Safety Of Cranes (AREA)
  • Jib Cranes (AREA)

Abstract

On détecte le déplacement d'un câble à l'aide d'une grandeur de variation du déplacement du câble mesurée à des intervalles de temps prédéterminés, et l'on obtient la grandeur de déplacement du câble à partir de la valeur accumulée des grandeurs de variation. Lorsqu'un crochet atteint une position d'extension en spirale, la valeur accumulée du déplacement du câble se remet automatiquement à zéro de manière à actualiser la position de référence du déplacement du câble, et les erreurs de mesure du déplacement du câble sont corrigées. On détermine la distance entre l'extrémité d'une flèche ou d'un bras et le crochet suspendu à celui-ci à partir de la grandeur de déplacement du câble ainsi obtenue, et l'on calcule l'élévation dudit crochet. L'élévation du crochet, c'est-à-dire sa position, ainsi calculée s'affiche sur un dispositif d'affichage avec référence à un indice ou une configuration fixe afin que l'opérateur puisse contrôler le comportement dudit crochet.

Claims (13)

  1. Procédé pour déterminer une distance de levage de crochet de grue (L-l) en obtenant une distance de levage maximale (L) selon un réglage de mécanisme de grue préfixé, et en obtenant une longueur de suspension (l) d'une structure formant crochet (34) suspendue par un câble (33) à partir d'une flèche (32) du mécanisme de grue, ledit procédé étant caractérisé par :
       la détection d'un mouvement de déplacement du câble sur un intervalle de temps prédéterminé ;
       la détermination d'une étendue de câble en tant que valeur accumulée de distances de déplacement de câble ;
       la détermination de la longueur de suspension (l) selon la valeur accumulée des distances de déplacement ;
       la détection du moment où la structure formant crochet atteint une position de levage supérieure correspondant à une position de levage maximale ; et
       la réinitialisation de la valeur accumulée lorsque la structure formant crochet est détectée au niveau de la position de levage supérieure.
  2. Procédé selon la revendication 1, comprenant, de plus, l'étape de détermination de l'angle de la flèche, et dans lequel l'étape de remise à l'état initial de la valeur accumulée comprend la remise à l'état initial de la valeur accumulée seulement si l'angle de flèche dépasse un angle de fonctionnement prédéterminé lorsque la structure formant crochet est détectée au niveau de la position de levage supérieure, de sorte que la valeur puisse être remise à l'état initial dans un état de fonctionnement de la grue immédiatement après le démarrage du fonctionnement de la grue.
  3. Procédé selon la revendication 2, dans lequel ledit angle de fonctionnement prédéterminé est d'environ 30°.
  4. Procédé selon la revendication 1, 2 ou 3, dans lequel le déplacement de câble est détecté en tant que mouvement du câble par rapport à la flèche.
  5. Procédé selon la revendication 4, comprenant, de plus, l'étape de détection d'une quantité de déplacement dans la longueur de flèche sur un intervalle de temps prédéterminé, et de modification de ladite longueur de suspension (l) en réponse au déplacement de longueur de flèche.
  6. Procédé selon la revendication 1, 2, 3 ou 4, comprenant, de plus, la détection d'une quantité de déplacement dans un angle de décalage de bras sur un intervalle de temps prédéterminé, et la modification de ladite longueur de suspension (l) en réponse au déplacement d'angle de décalage de bras.
  7. Procédé selon l'une quelconque des revendications précédentes, dans lequel la valeur accumulée est remise à l'état initial seulement lorsque la structure formant crochet est au niveau de la position de levage supérieure pendant une période plus longue qu'une période de temps prédéterminée.
  8. Appareil pour déterminer une distance de levage de crochet de grue (L-l) en obtenant une distance de levage maximale (L) selon un réglage de mécanisme de grue préfixé, et en obtenant une longueur de suspension (l) d'une structure formant crochet (34) suspendue par un câble (33) à partir d'une flèche (32) du mécanisme de grue, ledit appareil étant caractérisé par :
       un moyen (39) pour détecter un mouvement de déplacement du câble sur un intervalle de temps prédéterminé afin d'obtenir une quantité d'étendue de câble en tant que valeur accumulée de distances de déplacement de câble ; et
       un moyen (200) pour déterminer la longueur de suspension (l) selon la valeur accumulée des distances de déplacement de câble ; et
       un moyen (36 ; 39 ; 200) pour réinitialiser la valeur accumulée lorsque la structure formant crochet est détectée au niveau d'une position de levage supérieure correspondant à une position de levage maximale.
  9. Appareil selon la revendication 8, dans lequel le moyen pour remettre à l'état initial la valeur accumulée comprend un moyen (200) pour remettre à l'état initial la valeur accumulée seulement si l'angle de la flèche dépasse un angle de fonctionnement prédéterminé lorsque la structure formant crochet est détectée au niveau de la position de levage supérieure, de sorte que la valeur accumulée puisse être remise à l'état initial dans un état de fonctionnement de la grue immédiatement après le démarrage du fonctionnement de la grue.
  10. Appareil selon la revendication 9, dans lequel l'angle de fonctionnement prédéterminé est d'environ 30°.
  11. Appareil selon la revendication 8, 9 ou 10, comprenant, de plus, une unité d'affichage de structure formant crochet (211 à 213), ladite unité d'affichage de structure formant crochet comprenant :
       un écran d'affichage (212) ;
       un moyen d'affichage de représentation schématique de structure formant crochet (211) pour afficher, de façon dynamique, une représentation schématique d'une structure formant crochet sur ledit écran à une position déterminée selon l'étendue de câble calculée ; et
       un moyen (211, 213) comprenant une touche (213) pour afficher, de manière fixe, un motif de plage limite de fonctionnement sur ledit écran par rapport à ladite représentation schématique sur ledit écran, en réponse à une entrée de touche par un opérateur lorsque ladite structure formant crochet est sélectionnée et déplacée vers ladite position cible.
  12. Dispositif de sécurité de grue comprenant l'appareil comme défini dans la revendication 11.
  13. Dispositif de grue comprenant l'appareil comme défini dans l'une quelconque des revendications 8 à 12.
EP90909368A 1990-06-15 1990-06-15 Appareil d'affichage de l'elevation du crochet d'une grue et methode de determination Expired - Lifetime EP0487725B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90909368T ATE134358T1 (de) 1990-06-15 1990-06-15 Sichtanzeigegerät und bestimmverfahren für die höhenlage eines kranhakens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1990/000784 WO1991019665A1 (fr) 1990-06-15 1990-06-15 Appareil d'affichage de l'elevation du crochet d'une grue

Publications (3)

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EP0487725A1 EP0487725A1 (fr) 1992-06-03
EP0487725A4 EP0487725A4 (en) 1992-12-02
EP0487725B1 true EP0487725B1 (fr) 1996-02-21

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Country Link
EP (1) EP0487725B1 (fr)
KR (1) KR0153459B1 (fr)
DE (2) DE487725T1 (fr)
RU (1) RU2096307C1 (fr)
WO (1) WO1991019665A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4228392A1 (de) * 1992-07-06 1994-01-13 Liebherr Werk Nenzing Verfahren zur Steuerung des Greifers eines Seilbaggers
WO1996027548A1 (fr) * 1995-03-03 1996-09-12 Komatsu Ltd. Dispositif destine a indiquer la plage de mobilite d'un vehicule a grue mobile
JP2002241082A (ja) * 2001-02-16 2002-08-28 Tadano Ltd 作業機の作動状態表示装置
US7677401B2 (en) * 2008-07-16 2010-03-16 Manitowoc Crane Companies, Inc. Load monitoring and control system with selective boom-up lockout
CN101723239B (zh) * 2009-11-20 2012-05-02 三一汽车制造有限公司 吊钩姿态检测装置和起重机
JP7180966B2 (ja) 2016-01-29 2022-11-30 マニタウォック クレイン カンパニーズ， エルエルシー 視覚的アウトリガー監視システム
US11130658B2 (en) 2016-11-22 2021-09-28 Manitowoc Crane Companies, Llc Optical detection and analysis of a counterweight assembly on a crane
CN114476959B (zh) * 2022-04-07 2022-08-05 杭州杰牌传动科技有限公司 一种塔式起重机变幅机构预警系统
CN115190243B (zh) * 2022-07-08 2024-04-05 上海西派埃智能化系统有限公司 一种行车停止位监测系统及方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5430754Y2 (fr) * 1974-01-31 1979-09-27
JPS5823883U (ja) * 1982-07-07 1983-02-15 株式会社多田野鉄工所 クレ−ンの作業状態表示器
JPS60107710U (ja) * 1983-12-27 1985-07-22 石川島播磨重工業株式会社 巻上装置
JPS62205993A (ja) * 1986-03-07 1987-09-10 株式会社小松製作所 クレ−ンのフツク位置検出装置
JPS63178291U (fr) * 1987-05-11 1988-11-18

Also Published As

Publication number Publication date
DE487725T1 (de) 1992-09-24
EP0487725A1 (fr) 1992-06-03
WO1991019665A1 (fr) 1991-12-26
EP0487725A4 (en) 1992-12-02
DE69025477D1 (de) 1996-03-28
KR0153459B1 (ko) 1999-02-18
RU2096307C1 (ru) 1997-11-20
DE69025477T2 (de) 1996-07-18

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