EP1398292A1 - Dispositif de commande pour plates-formes de levage - Google Patents

Dispositif de commande pour plates-formes de levage Download PDF

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Publication number
EP1398292A1
EP1398292A1 EP03019590A EP03019590A EP1398292A1 EP 1398292 A1 EP1398292 A1 EP 1398292A1 EP 03019590 A EP03019590 A EP 03019590A EP 03019590 A EP03019590 A EP 03019590A EP 1398292 A1 EP1398292 A1 EP 1398292A1
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EP
European Patent Office
Prior art keywords
transmitter
receiver
control device
lifting
sound
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP03019590A
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German (de)
English (en)
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EP1398292B1 (fr
Inventor
Anton Knestel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maha Maschinenbau Haldenwang GmbH and Co KG
Maha GmbH and Co KG
Original Assignee
Maha Maschinenbau Haldenwang GmbH and Co KG
Maha GmbH and Co KG
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Publication date
Application filed by Maha Maschinenbau Haldenwang GmbH and Co KG, Maha GmbH and Co KG filed Critical Maha Maschinenbau Haldenwang GmbH and Co KG
Publication of EP1398292A1 publication Critical patent/EP1398292A1/fr
Application granted granted Critical
Publication of EP1398292B1 publication Critical patent/EP1398292B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
    • B66F7/28—Constructional details, e.g. end stops, pivoting supporting members, sliding runners adjustable to load dimensions

Definitions

  • the invention relates to a control device for lifting platforms, which detects a lifting height h of the lifting platform and adjusts it according to a predetermined target height H 0 .
  • Lifts especially for vehicles, usually have one or several lifting units for lifting or lowering a platform, on which the object to be lifted stands.
  • Known Lifting units are, for example, punch or scissor hoists.
  • a vehicle to be lifted is placed on a single or multi-part platform the lift (driving surface), which is used to work on the Vehicle is lifted by the lifting unit (s).
  • the vehicle can also be lifted from a structure, with a or grab several support arms under the vehicle and lift it. Some lifts have the for each axle or wheel to be lifted vehicle provided a separate lifting unit.
  • EP 0 866 306 describes a device for distance measurement, where a friction wheel rolls on a cylinder piston rod. With this non-form-fitting path measurement it can, however Pollution will cause slip problems, especially on one smooth, oily cylinder rod of a lifting cylinder.
  • the object of the present invention is a control device to create lifts that are easy and accurate to grasp and control of the lift height of the lift.
  • the control device has at least one ultrasonic transmitter for emitting ultrasonic waves and at least an ultrasound receiver.
  • An evaluation device determines the lifting height h der based on the signals from the transmitter and receiver Lift.
  • An ultrasonic displacement measurement to determine the lifting height h is contactless, maintenance-free, suitable for larger lifting heights, insensitive to contamination and inexpensive.
  • the ultrasonic path measurement enables a precise determination of the Lifting height h. In contrast to an optical or magnetic scanning system effort and costs are independent of the travel or Scan path.
  • the control device can have at least one adjusting device for raising or lowering the lifting platform and a control unit for controlling the adjusting device on the basis of the determined lifting height h.
  • a control device enables precise setting of the desired lifting height H 0 over a wide range from a few centimeters to several meters.
  • the control device according to the invention can be used, for example, for activation of motor vehicle lifts, height-adjustable work platforms, especially for performing work on Buildings, and mobile height-adjustable work equipment, in particular used for transporting containers or the like become. Due to the very precise determination of the lifting height by means of the ultrasonic measurement, the control device can be precise Setting the height of a platform for loading and unloading Vehicles, ships or aircraft are used.
  • control unit In order to set the lifting platform to the desired target height H 0 , it is expedient for the control unit to compare the determined lifting height h with the predetermined target height H 0 and to control the adjusting device of the lifting platform as a function of the comparison result.
  • the control unit can have a controller known per se with a predetermined control characteristic and / or a power amplifier for controlling the adjusting device or a hydraulic unit which generates a fluid pressure for operating the adjusting device.
  • the transmitter can emit ultrasound pulses of a predetermined length of time send out and the evaluation device a sound propagation time T of the ultrasonic pulses determine from sender to receiver.
  • the evaluation device can take the receiver into account the speed of sound c the distance covered Determine sound wave. Due to the known arrangement of The transmitter and receiver can use the evaluation device the lifting height h the lift. Because the signal energy of an ultrasonic pulse The length of the ultrasound pulse depends on the duration of the pulse to be chosen so that a sufficiently reliable detection the pulse is guaranteed by the receiver.
  • the transmitter emits an ultrasound pulse (burst) of a certain length, e.g. 1 ms, sends out.
  • the receiver detects the emitted ultrasound pulse, after covering the distance from sender to receiver Has.
  • the evaluation device can the time delay T between sending and receiving the ultrasound pulse by, for example, an electronic circuit with one of the Determine transmitter signal S triggered counter.
  • the counter counts the Counts of a clock until the received signal E the threshold of a Schmitt trigger. This runtime measurement can be repeated periodically, for example every 10 or 100 ms.
  • the ultrasonic transmitter can advantageously use digital control signals controlled to send digital ultrasound signals become.
  • the evaluation device can be continuously distinguished generate digital code words in the form of pulse trains from the transmitter be sent.
  • the individual code words can be random or can be generated according to a specified scheme. It is special advantageous to generate optimally discriminatory code words that for example a maximum (inhibitory) distance from a code word to the next code word or which are orthogonal to each other are.
  • the digital code words change from sender to receiver transmitted and arrive there with a time delay T.
  • the evaluation device can expediently be a correlation device which have the time delay T between the Sending a code word and receiving the code word determined.
  • the correlation device can be a digital correlator have, which determines the correspondence of binary signals. This is preferably done by moving one of the two signals in a shift register and the detection of the signal match.
  • the maximum of this digital cross-correlation function between sent code word and received Signal can have the signal runtime with a temporal resolution of one Clock period can be determined. For example, at a transmitter frequency of 40 kHz, a path resolution of 8.25 mm can be achieved.
  • the code length is expediently chosen so that a detection is guaranteed with sufficient security.
  • Longer code words have the advantage that due to the larger number of bits are easier to discriminate and a larger signal Have energy, which increases the detection reliability of the receiver can be increased.
  • a phase evaluation device can expediently be located in the evaluation device to determine the phase relationship between the transmitter signal S and the receiver signal E may be provided. This can be done, for example, by measuring the time between one Edge of the transmitter signal S and an edge of the receiver signal E. happen. By detecting a change in this phase relationship can change the distance between transmitter and receiver be determined. To record the relative movement between The phase evaluation device compares the transmitter and receiver the excitation signal S of the transmitter with that detected by the receiver Signal E and determines the phase relationship between them generally periodic signals.
  • the evaluation of the phase relationship has the advantage that transmitter and receiver are in one steady-state operation can be, causing swelling and decay the vibrations of the transmitter and receiver at the beginning and end of a pulse can be prevented and the measurement accuracy increases.
  • the maximum resolution of the distance measurement is essentially by the accuracy of the phase evaluation, i.e. determined by a time measurement. Because time measurements with very high Accuracies are possible, the lifting height h can also be precise be determined
  • the absolute sound propagation time T from the transmitter to the receiver is determined become. This can be done, for example, by evaluating the cross-correlation function between the transmitter signal S and the receiver signal E done. From the maximum of the cross correlation function can determine the time delay between these two signals become.
  • the sound propagation time can be determined by a digital one Send pulse train with the evaluation of the phase relationship between Transmitter signal S and receiver signal E can be combined.
  • the absolute distance measurement allows the distance between transmitter at any time and determine the receiver, regardless of any malfunctions, which, for example, the sound propagation between transmitter and Interfering with the recipient at short notice.
  • To get the maximum resolution of the absolute displacement measurement by the wavelength of the ultrasonic waves or the time it takes to send an ultrasonic pulse or a digital transmission pulse sequence is required, is determined, can also increase the phase relationship between transmitter signal S and receiver signal E are evaluated.
  • Such one Gate switching can, for example, by means of appropriate logic gates and a flip-flop can be realized. Instead of the rising flanks the phase can also be evaluated on falling edges.
  • the counting pulses of a clock generator reach one Counter that counts the incoming counts.
  • the phase relationship between transmission signal S and receiver signal E results from the counter reading Z of the counter and the clock rate TR of the clock generator.
  • the temporal resolution of the phase evaluation device can from the ratio of the clock rate TR of the clock generator to the transmission frequency f of the transmitter can be determined. This ratio determines TR / f also the maximum meter reading, i.e. the counter reading of the with a phase relationship of 360 ° between the signals S and E. occurs.
  • the counter can up to a predetermined number of counts N count and at the next incoming count pulse to a specific one Value to be reset. It is particularly beneficial if the counter at the by the ratio of clock rate to transmitter frequency TR / f certain number of counts reset becomes.
  • the counter can for example up to this number N incoming Add pulses and reset to zero on the next pulse or starts at N counts and subtracts incoming pulses until the counter reading Z reaches zero.
  • the evaluation device can determine the lifting height h on the basis of the counter reading Z and the number R of resets of the counter. With an increase in the distance between the transmitter and the receiver, the phase shift between S and E and thus the counter reading Z increases until there is a phase jump when there is a change in distance of a wavelength ⁇ of the transmitter signal. This phase jump is detected by the phase evaluation device on the basis of the reset signal R of the counter.
  • the distance a between the transmitter and receiver results from the number of phase jumps R that occurred during the movement of the transmitter or receiver, multiplied by the wavelength ⁇ , of the ultrasound signal.
  • the measurement accuracy of this phase evaluation is ⁇ N and can be easily adapted to the given requirements for the measuring accuracy of the lifting height h by appropriate selection of N.
  • the speed of sound can be determined on the basis of the determined temperature t c, the sound propagation time T, the phase relationship between the signals S and E and / or the lifting height h determined or corrected become. This is particularly useful if there are different Parts of the lift other temperature conditions occur, e.g. by sun exposure or blown hot air a heater.
  • the control device can provide at least one temperature sensor, which is the air temperature t in the vicinity of the ultrasonic measuring section detected. To different temperatures in several positions of the lift, it is advisable to use several temperature sensors provided.
  • the speed of sound c can, for example based on a temperature characteristic with a linear Connection or a root connection between Temperature t and speed of sound c can be determined. Based on this temperature compensation, the measurement accuracy the ultrasonic displacement measurement can be increased.
  • the direction of propagation of the sound waves emitted by the transmitter to influence it is advantageous to provide a focusing device. Since conventional ultrasound transmitters have a cardioid radiation pattern have, sound signals are also not direct Away from the sender to the receiver. Sound signals can, for example from a building wall or part of the lift be reflected and then reach the recipient with a longer one Sound path. Depending on the phase position of the direct Sounds to the reflected sound at the receiver can be added or subtraction of the signals interference that occurs Can affect distance measurement. By one attached to the transmitter Sound horn can affect the radiation characteristics of the transmitter be influenced and the sound waves are bundled. The biggest Part of the radiated sound energy can be directed to the direct sound path be concentrated between sender and receiver. Meßsignalverbibschept through reflections or interference are reduced.
  • the receiver can be used to select incoming sound waves a corresponding device, in particular an aperture or a Tube. Because this selection device is preferred Transmits sound waves of a predetermined direction of propagation it is possible to suppress sound waves from other directions of propagation or suppress.
  • the selection device is preferred the receiver is aimed at the direct connection to the transmitter, to dampen reflected sound waves.
  • a reflector for reflecting that from the transmitter emitted sound waves may be provided.
  • the transmitter and receiver are on one moving part the lift or arranged together stationary on the lift.
  • the sender and receiver are on the bottom the platform's height-adjustable platform.
  • the transmitter emits ultrasonic signals towards the ground on which the Lift is arranged from.
  • the lifting height h is half the distance a, which is the ultrasonic signal from sender to receiver. If that's the Object reflecting sound waves (e.g. the platform of the lift) has sufficient sound hardness and sufficient The proportion of the incident sound waves reflected is the attachment a separate reflector is not required.
  • the transmitter and receiver can be used as a combined ultrasound transducer be trained.
  • the converter is used, for example, with a burst excited of 1 ms length. Then the converter is on reception switched. The reflected signal corresponds to the lifting height received by the converter with a delay. After stimulation by the Transmit burst, however, a certain waiting time must be observed, before the transmission signal has subsided and the converter as Receiver can be used. This results in a minimal Path length that the signal from the transmitter to the receiver or from Transducer to the reflector and back must travel.
  • transmitters and Receiver designed as separate transmitting and receiving units his. These should preferably be arranged so that between the transmitter and receiver no structure-borne noise coupling occurs.
  • the sending and receiving unit for example, be arranged side by side. However, it is also possible for direct path measurement of the transmitter and receiver without operating a reflection of the sound waves. Send- and the receiving unit are at the two ends of the measuring distance arranged.
  • the transmitter can, for example, be stationary on the lifting platform or the Floor or the foundation on which the lift is placed his.
  • By arranging the receiver on a movable Part of the lift can be the distance a between the transmitter and receiver be determined. For example, if the recipient is on a height-adjustable platform of the lifting platform or a supporting structure arranged to raise the load, the distance a between Transmitter and receiver essentially the lifting height h Lift. Should the receiver not be directly on the part of the lift attached, the lifting height h of which can be determined, can this by evaluating the geometric relationships (lever arms, Angles, ratios, etc.) between the parts of the lift become. A reverse arrangement is of course also possible of sender and receiver possible.
  • Transmitter and receiver can be adjusted on the lift be arranged around a travel path v of the adjusting device to determine.
  • the evaluation device determines the lifting height h based on the travel path v and the geometric relationships (lever arms) the lift.
  • An arrangement of transmitter and receiver on the adjustment device is structurally simple and has the Advantage that the measuring section between transmitter and receiver against an accidental interruption of sound propagation largely is protected.
  • the adjusting device can preferably be a hydraulic cylinder or a pressurized cylinder.
  • the transmitter or receiver can fall on the one hand on the cylinder housing and on the other hand on the movable piston rod or one be arranged with this connected component.
  • Other adjustment devices e.g. on Spindle drive, possible.
  • the evaluation device expediently determines on the basis of of the respective travel paths v of the adjustment devices, the lifting height h the lift. Depending on the arrangement of the adjustment devices to consider their travels v accordingly. For example are the travel paths in a series connection of the adjustment devices to add v.
  • Multiple transmitters can determine at multiple locations and receiver can be provided.
  • the evaluation device detects the corresponding sound paths between the respective transmitters and Receiver and determines the lifting height h of the lift.
  • the evaluation device preferably determines the lifting heights h a , h b of different parts of the lifting platform, in particular of a plurality of lifting platforms, lifting arms or cantilevers of the lifting platform. This is particularly expedient if the lifting platform is constructed in several parts and the individual parts have their own adjustment devices.
  • lifting platforms for motor vehicles can have separate platforms or driving surfaces for the left and right wheels of the vehicle. These separate driving surfaces are usually moved by separate hydraulic cylinders.
  • the control unit controls the adjustment devices.
  • the control path v and / or the speed of the adjustment movement can be synchronized by the control.
  • the control unit can compare the lifting heights h a , h b determined by the evaluation device and / or their changes over time and determine deviations. If deviations are found, the control unit can, for example, briefly stop a leading adjustment device and / or influence its adjustment speed. This can be done by a corresponding control of a hydraulic unit for generating hydraulic pressure for the adjusting devices and / or an actuation of hydraulic valves.
  • the control unit preferably controls the adjustment devices, the hydraulic unit and / or the valves in order to achieve a uniform height h of the platform or uniform lifting heights h a , h b of the platforms of multi-part lifting platforms.
  • the lift can be positioned very precisely due to the precise ultrasonic displacement measurement and the possible precise control of the lifting height or lifting heights. This is particularly important when carrying out measurements on the object standing on the lift or raised by it.
  • the control device according to the invention allows, for example, multi-part driving surfaces of motor vehicle lifts to be positioned so precisely that wheel alignment on vehicles is possible.
  • the control unit can also carry out a predetermined control function. For example, warning signals and / or lighting can be switched on and off by the control unit.
  • the control unit can also automatically start a measurement or test program.
  • Fig. 1 shows schematically an embodiment of the invention Control device for lifting platforms.
  • the control device has an ultrasound transmitter 1 for emitting ultrasound signals, e.g. with a frequency of 40 kHz.
  • the ultrasonic transmitter 1 sends ultrasonic pulses, e.g. with a length of 1 ms.
  • the This ultrasonic pulse is emitted by an evaluation device 3 controlled and monitored.
  • the transmitter 1 In order to influence the direction of propagation of the emitted sound waves, the transmitter 1 has a sound horn 13.
  • the Schallhorn 13 bundles the emitted sound waves in a preferred direction of radiation, to reduce unwanted reflections of the sound waves.
  • the sound waves emitted by the transmitter 1 meet a movable one Part of the lift 10 and are reflected there. Because in the shown Embodiment the sound waves on the underside of a height-adjustable Platform 16 of the lift 10 hit and the Reflection coefficient of the platform 16 sufficient reflection of the No additional reflector is provided for sound waves.
  • the reflected sound waves are from an ultrasound receiver 2, which is connected to the evaluation device 3, detected.
  • Channel In this example, 1 and receiver 2 are separate transmitters Receiving units designed to a structure-borne noise coupling to prevent and send and receive the sound waves without waiting time when switching from transmit to receive mode enable. Since the receiver 2 is not due to the decay of the transmission signal must wait in transmitter 1, there is no minimum signal runtime for to comply with the sound waves.
  • the transmission of the ultrasound pulses from the transmitter 1 is initiated by the evaluation device 3 at predetermined intervals.
  • the evaluation device 3 determines the signal propagation time T of the ultrasound pulses from the transmitter 1 to the platform 16 and back to the receiver 2.
  • a second receiver 11 is provided at a predetermined fixed distance d from the transmitter 1.
  • the lifting height h determined by the evaluation device is fed to a control unit 4. This compares the determined lifting height h with a predetermined target height Ho and controls the adjusting device 5, here a hydraulic cylinder, in such a way that the target lifting height H 0 of the lifting platform 10 is reached.
  • control unit 4 can also carry out further control functions, such as, for example, switching warning tones and / or lights on and off.
  • Evaluation device 3 and control unit 4 are preferably designed as an electronic unit, for example a microcontroller or a programmable control unit.
  • the target height H 0 can be entered manually, for example using a keyboard or another input device. It is also possible for the target height H 0 to be specified by a measuring or control computer.
  • FIG. 2 shows a schematic illustration to explain a Evaluation device 3 according to the invention.
  • the transmitter 1 is on the movable Cylinder rod 23 of a hydraulic cylinder 5 is arranged.
  • the Receiver 2 is located on the cylinder housing 24 of the hydraulic cylinder 5.
  • the evaluation device 3 determines the phase relationship the travel distance between transmitter signal S and receiver signal E. v of the hydraulic cylinder 5. Due to the known geometric Arrangement of the lifting platform 10 can be based on the Travel v the lifting height h of the lifting platform 10 can be calculated.
  • the evaluation device 3 has a phase evaluation device 8 on which the phase relationship between the transmitter signal S and the receiver signal E determined.
  • the signals E and S are over two comparators (Schmitt trigger) 19 converted into square wave signals.
  • the phase evaluation device 8 measures the time between the rising edge of the transmitter signal S and the rising edge of the receiver signal E.
  • a gate circuit 6 is provided for this purpose, which opens with a rising edge of the signal S and with a rising edge of signal E closes. With the gate open Count pulses from a clock 7 added in a counter 12. additionally the counter reading is at an edge of the transmitter signal S. the previous measurement.
  • the lifting platform 10 If the lifting platform 10 is moved, i.e. Move transmitter and receiver relative to each other, the phase relationship between changes Transmitter signal S and receiver signal E. Moving transmitter and receiver apart for example, the phase shift and the value Z of the counter increases until it reaches the maximum number of counting pulses N reached. After reaching N the Counter again with zero. When the lift is lowered, the counter reading Z correspondingly smaller to zero when the value is reached to jump back to N. At a speed of sound of 340 m / s and an excitation frequency of 40 kHz is reset of the counter after changing the sound path by 8.5 mm.
  • a speed of sound determination device 12 and a temperature sensor 9 are provided.
  • the temperature sensor 9 is preferably arranged in the vicinity of the measuring section between transmitter 1 and receiver 2 and measures the air temperature t there.
  • the speed of sound determination device 12 determines the speed of sound c on the basis of a temperature characteristic:
  • the lift height h can be set precisely.
  • the temperature influences on the individual Adjustment devices are corrected, which results in synchronous lifting and lowering also possible at different temperatures is.
  • part of the lift can be in a climatic chamber be arranged.
  • Another part of the lift is e.g. illuminated by the sun or blown by a heater
  • a tube 14 is attached to the receiver 2.
  • the tube 14 is achieved that preferably sound waves with a Direction of propagation in the axial pipe direction reach the receiver 2 can. Reflected sound signals with different directions of propagation are suppressed.
  • the recipient 2 can move in the tube 14 together with the lifting platform 10, the transmitter 1 the tube 14 at a predetermined distance, e.g. 10 cm, illuminates. This way only the sound waves get in the measuring tube, which is essentially the direct path between the transmitter 1 and receiver 2 correspond.
  • the receiver signal E is essential more stable because modulation with reflected sound is reduced becomes.
  • the two-part lifting platform 10 has two platforms 16a, 16b. There is a combined ultrasound transducer on each of the two platforms 16a, 16b 17a, 17b provided. Are in the ground or foundation Reflectors 15a, 15b attached by the ultrasonic transducers 17a, 17b reflect emitted sound waves.
  • the evaluation device 3 determines the heights h a , h b of the two platforms 16a, 16b of the lifting platform 10. These lifting heights h a , h b are fed to a control unit 4. To control the lifting heights h a , h b , the control unit 4 forms the control deviations h a - H 0 , h b - H 0 and, if appropriate, h a - h b . These differences are evaluated by a control device 20 in order to control the lifting heights h a , h b of the platforms 16a, 16b synchronously. Power elements 21a, 21b control a hydraulic unit 22 for generating the respective hydraulic pressure for the adjusting devices 5a, 5b. The control device 20 can carry out a height control and / or a speed control of the adjustment devices 5a, 5b. In this way it is possible to raise or lower the platforms 16a, 16b synchronously.
  • proportional or binary switching actuators e.g. Hydraulic valves can be provided to perform the control functions.
  • the actuators can by the control device 20 or the power elements 21a, 21b are actuated and the pressure in affect the hydraulic cylinders 5a, 5b. Since in this case the The hydraulic cylinders 5a, 5b are controlled via the actuators, it is possible to provide a simpler hydraulic unit 22 which creates a constant pressure.
  • a signal generator 25 generates square-wave signals A (e.g. at 40 kHz) that via an electronic controlled by the evaluation device 3 Switch 26 and a signal amplifier 27 to the ultrasound transmitter 1 are fed.
  • the signal to control the switch 26 is denoted by B and the signal fed to the transmitter denoted by C.
  • the switch 26 the continuous wave signal A is cyclically switched on and off.
  • the receiver 2 receives the ultrasound signal and conducts it the received signal D via a signal amplifier 28 of the evaluation device 3 to. This leads to the determination of the distance between Transmitter 1 and receiver 2 using the signals A shown in FIG. 4b, B, D through. With appropriate arrangement of transmitter 1 and receiver 2 this distance corresponds to the lifting height h of the lift.
  • the incremental distance measurement takes place after the principle of phase evaluation between transmit and Reception signal. This measurement can be done with high accuracy and provides an exact indication of the travel path of the lift. However, the sound path between transmitter 1 and receiver 2 interrupted, the evaluation device 3 can synchronize lose between transmit and receive signal and count pulses can be lost. Usually the lift is an emergency stop and a manual return of the lift to a reference position required.
  • the double distance measurement can be carried out cyclically, as in Fig. 4a, b shown.
  • the continuous wave signal A is periodically by the Switch 26 modulated. Based on the received signal D is then both the transit time T and the phase relationship p are determined and evaluated.
  • the runtime measurement is preferably carried out at times when the Lift is not moved. Then the continuous wave operation can be interrupted without disturbing the phase evaluation. For example when the control device receives a drive command that Sound propagation time in pulse mode determined before the lift moves and the transmitter for phase evaluation on continuous wave operation is set. In this way, a control value can be set before starting for the lifting height h determined by the absolute displacement measurement become. This control value can be compared with a constant, Non-volatile memory stored actual value for the lift control be compared to determine if the altitude measurement was carried out without errors. Such an approach enables an additional control of the lift position and thus increases operational safety.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
EP20030019590 2002-09-13 2003-09-03 Dispositif de commande pour plates-formes de levage Expired - Lifetime EP1398292B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2002142672 DE10242672A1 (de) 2002-09-13 2002-09-13 Steuervorrichtung für Hebebühnen
DE10242672 2002-09-13

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EP1398292A1 true EP1398292A1 (fr) 2004-03-17
EP1398292B1 EP1398292B1 (fr) 2006-11-15

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DE (2) DE10242672A1 (fr)
DK (1) DK1398292T3 (fr)
ES (1) ES2275050T3 (fr)

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EP2428481A1 (fr) * 2010-09-13 2012-03-14 MAHA Maschinenbau Haldenwang GmbH & Co. KG Pont elévateur
CN103771297A (zh) * 2014-01-24 2014-05-07 南通剑桥输送设备有限公司 一种简易升降平台
CN109568055A (zh) * 2019-01-11 2019-04-05 四川海盛杰低温科技有限公司 一种具备内循环且低能耗的液氮冷疗舱

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DE102006042186A1 (de) 2006-09-08 2008-03-27 Giesecke & Devrient Gmbh Verfahren für die Vernichtung von Banknoten
DE102008048307A1 (de) * 2008-07-09 2010-01-21 Moba-Mobile Automation Ag Vorrichtung und Verfahren zur Bestimmung einer Ausfahrlänge von einem ausfahrbaren Maschinenteil
CN102515054B (zh) * 2011-12-09 2013-09-25 佛山市新泰隆环保设备制造有限公司 一种浮力式自动升降平台
DE102013019722A1 (de) * 2013-11-27 2015-05-28 Otto Nussbaum Gmbh & Co. Kg Hubvorrichtung zum Heben schwerer Lasten
WO2016043998A1 (fr) 2014-09-15 2016-03-24 Crown Equipment Corporation Chariot élévateur comprenant une structure de détection de charge optique

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DK1398292T3 (da) 2007-03-26
DE10242672A1 (de) 2004-03-25
EP1398292B1 (fr) 2006-11-15
DE50305668D1 (de) 2006-12-28

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