EP4149878A1 - Verfahren zum betreiben eines hebegeräts und hebegerät zur durchführung eines verfahrens - Google Patents
Verfahren zum betreiben eines hebegeräts und hebegerät zur durchführung eines verfahrensInfo
- Publication number
- EP4149878A1 EP4149878A1 EP21720718.2A EP21720718A EP4149878A1 EP 4149878 A1 EP4149878 A1 EP 4149878A1 EP 21720718 A EP21720718 A EP 21720718A EP 4149878 A1 EP4149878 A1 EP 4149878A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sensor
- lifting device
- receiving part
- determined
- difference
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 49
- 230000009471 action Effects 0.000 claims abstract description 5
- 230000001960 triggered effect Effects 0.000 claims abstract description 5
- 230000006870 function Effects 0.000 claims description 24
- 238000001514 detection method Methods 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000010354 integration Effects 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims description 3
- 238000002604 ultrasonography Methods 0.000 claims 1
- 230000008901 benefit Effects 0.000 description 14
- 230000008859 change Effects 0.000 description 4
- 230000001419 dependent effect Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000000418 atomic force spectrum Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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
- B66F17/00—Safety devices, e.g. for limiting or indicating lifting force
- B66F17/003—Safety devices, e.g. for limiting or indicating lifting force for fork-lift trucks
-
- 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
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/0755—Position control; Position detectors
Definitions
- the invention relates to a method for operating a lifting device and a lifting device for carrying out a method.
- a lifting device is provided for lifting an object received on a receiving part.
- a lifting mechanism is known from WO 2019/130425 A1 as the closest prior art.
- the rope is not wound or unwound during operation and / or the rope tension does not change substantially in this hoist during operation.
- a lifting mechanism arranged on a vehicle is known from US 2013/0 341 124 A1.
- JP 2020- 7 078 A A method for recognizing an abnormal situation in an elevator is known from JP 2020- 7 078 A.
- the invention is therefore based on the object of developing the safety of a lifting device.
- the object is achieved in the lifting device according to the features specified in claim 10 and in the method according to the features specified in claim 1 or 9.
- the lifting device has a receiving part for receiving an object and a rope which can be at least partially wound up on a cable drum, the cable drum being drivable by a drive, in particular being rotatable, wherein the drive has a first sensor, wherein a first position of the receiving part can be determined from the values captured by the first sensor, a second sensor being arranged on the lifting device, wherein a second position of the receiving part can be determined from the values captured by the second sensor , wherein a first difference from the first and the second position is determined in a first time span, wherein a second difference from the first and the second position is determined in a second time span, wherein an action is triggered, in particular warning information is displayed and / or is forwarded to a computer connected to the lifting device, in particular to the control of the lifting device, by means of a data transmission channel, if the amount of the difference between the first and the second difference exceeds a permissible amount of deviation.
- the advantage here is that the rope elongation can be monitored by the two sensors.
- the first sensor is arranged via the electric motor and the cable drum essentially at the first end of the cable and the second sensor essentially detects the other end of the cable.
- a position of the receiving part can thus be determined with each of the two sensors, in particular in a first time span and later in a second time span.
- the second time period is advantageously at a great distance in time from the first time period.
- the rope elongation is brought about by the operation of the lifting device carried out between the first and second time periods, that is to say by the load on the rope during operation.
- the receiving part can be moved back and forth along a guide formed on the lifting device, in particular on the frame of the lifting device. from The advantage here is that the receiving part can be moved linearly by means of the winding or unwinding of the cable on the cable drum.
- the guide improves the precision of the movement.
- the first sensor is used to record values of a first physical variable, in particular the angular position of the rotor shaft of the electric motor driving the cable drum, on a first region of the cable, in particular close to the cable drum, and the second sensor to record them of values of a second physical variable in a second area spaced from the first area, in particular wherein the second physical variable is the distance between the second sensor attached to the frame and the receiving part, or wherein the second physical variable is the force transmitted through the rope.
- a first physical variable in particular the angular position of the rotor shaft of the electric motor driving the cable drum
- the second sensor to record them of values of a second physical variable in a second area spaced from the first area, in particular wherein the second physical variable is the distance between the second sensor attached to the frame and the receiving part, or wherein the second physical variable is the force transmitted through the rope.
- a first method step the receiving part is steered towards a first target position, in particular a first target position related to the frame of the lifting device is steered
- the first difference is determined within the first time period is, according to which the position of the receiving part is steered towards at least a second target position and / or to other target positions, with the receiving part being steered toward the first target position in a third method step, with a fourth method step carried out after the third method step within the second time period the second difference is determined, after which the action is triggered if the amount of the difference between the first and the second difference exceeds a permissible amount of deviation.
- the receiving part can be controlled towards a position and can subsequently also be moved along a position-time curve.
- the drive has an inverter which feeds the electric motor in such a way that the position detected by the first sensor is adjusted to a target position specified for the respective magazine.
- the receiving part can thus then be guided along a trajectory.
- the object received on the receiving part each has the same mass.
- the advantage here is that the kinematic movement is carried out in both measurements with the same mass and a comparison can therefore be carried out very precisely.
- no object is received on the receiving part in the second and fourth method step.
- the lifting device has a receiving part for receiving an object and a rope that can be at least partially wound up on a cable drum, the cable drum being drivable, in particular rotatable, by a drive Drive has a first sensor, wherein a first position, in particular a position value, of the receiving part can be determined from the values detected by the first sensor, a second sensor being arranged on the lifting device, a second position from the values detected by the second sensor , in particular a position value, of the receiving part can be determined, wherein in a first method step the receiving part is moved along a path curve with a path speed profile during a first time period, the profile of the values detected by the second sensor being the first as a function of the values detected by the first sensor Function saved is confirmed wherein in a second method step arranged temporally after the first method step, the receiving part is again moved along the path curve with the path speed curve, the curve of the values recorded by the second sensor being stored as a second function as
- the first sensor is an angle sensor for detecting the angular position of the rotor shaft of the electric motor of the drive, the second sensor being designed to detect a position of the receiving part.
- the advantage here is that the position of the receiving part can be determined in two different ways.
- the acquisition of values of a first physical variable namely the angular position of the rotor shaft of the electric motor driving the cable drum, can be carried out by means of the first sensor on a first area of the cable, in particular close to the cable drum, and the acquisition of values of a second physical variable , namely the distance between the second sensor, which is fastened to the frame, and the receiving part or the force passed through the cable, at a second area spaced apart from the first area.
- the rope elongation that occurs over time during operation between the first and second areas can thus be detected.
- the drive is designed as an electric motor or gear motor, in particular an electric motor with a gear.
- position control can be carried out. This is because the position of the receiving part can be adjusted to a target position by means of a converter-fed or inverter-fed electric motor.
- the second sensor is arranged on the frame of the lifting device, in particular the second sensor being an optical distance sensor and / or a laser distance sensor.
- the second sensor being an optical distance sensor and / or a laser distance sensor.
- the second sensor is arranged between the cable and the receiving part, in particular wherein the second sensor has a bolt which is connected to the cable and to the receiving part and a strain gauge is connected to the bolt, and / or with twofold Integration of the value profile detected by the second sensor, a position of the receiving part can be determined.
- the advantage here is that the position of the receiving part can be determined with the first sensor in a first area and with the second sensor in another area of the rope. In this case, however, the value curves recorded by the second sensor must be integrated over time.
- the lifting device has rotatably mounted wheels, by means of which the lifting device can be moved on a floor of a system.
- the advantage here is that the lifting device can be moved within the system.
- the lifting device can be used as a storage and retrieval unit in a system designed as a warehouse.
- a contactless writable and / or readable memory in particular an RFID tag
- an RFID reading and / or writing device is arranged on the lifting device, in particular on the frame of the lifting device.
- FIG. 1 A lifting device according to the invention is shown schematically in FIG. 1
- a vertical machine axis is arranged on a frame that can be moved on wheels 11 on a floor of a system.
- This machine axis has a guide 7, along which a receiving part 8 can be moved back and forth.
- the machine axis is preferably aligned vertically so that the receiving part 8 can be raised and lowered.
- An object 9 is received by the receiving part 8 or, in the simplest case, is only deposited on the receiving part 8.
- the object has a memory, in particular an RFID tag, which can be queried in a contactless manner, in particular by means of electromagnetic waves, in particular by means of radio waves.
- a corresponding reading device by means of which data can be queried from the memory, is attached to the receiving part 8.
- the mass of the object 9 is also included in the data.
- the reader is connected to an electronic control of the lifting device so that the mass can be taken into account in the provisions described below.
- a cable 5 is fastened with its first end to the receiving part 8 and is arranged so that it can be rolled up on a cable drum 4 at its other end.
- Deflection rollers 6 arranged on the lifting device allow a compact construction of the lifting device.
- a drive that drives the cable drum 4 can be arranged as low as possible so that the center of gravity of the lifting device is at a small distance from the ground.
- the drive has an electric motor fed by an inverter, which drives the cable drum 4 either directly or via an intermediate gear.
- the drive is attached to the lifter.
- the linear movement, in particular to and fro movement, of the receiving part 8 is guided by a guide 7, in particular a linear guide.
- a second sensor 2, which determines the linear position of the receiving part 8, is attached to the lifting device.
- the drive has a first sensor 1, by means of which the angular position of the rotor shaft of the electric motor 3 is detected.
- the first sensor 1 and the second sensor 2 are connected to the controller.
- the control also determines the linear position of the receiving part 8 from the angular position of the rotor shaft of the electric motor 3 detected by the first sensor 1, taking into account the geometric data of the cable 5 and the cable drum 4.
- the difference between the linear position determined from the values detected with the first sensor 1 and the linear position determined from the values detected with the second sensor 2 can thus be determined.
- a first determination of the difference is carried out and stored as the first value in a non-volatile memory of the controller.
- the difference is determined in a recurring manner as the second respective second value and, if a first impermissibly high degree of deviation between the first and the second value is exceeded, warning information is displayed, forwarded and / or outputted in good time by the control system indicates an impermissibly high rope elongation.
- the rope 5 can then be replaced in good time before a mechanical overload occurs.
- the guide 7 for the receiving part 8 which is linearly movable relative to the frame 10 along the guide 7 is attached to the frame 10.
- the second sensor 2 is also attached to the frame 10.
- the second sensor 2 is arranged in such a way that it can detect the position of the receiving part 8.
- the second sensor 2 preferably detects the position of the receiving part 8 in relation to the frame 10 in a contactless manner.
- the second sensor 2 is as Executed optical distance detection system, so that the distance between the second sensor 2 and the receiving part 8 is used as a position.
- the angular position of the rotor shaft is detected by means of the first sensor 1 and, if necessary, taking into account the translation of a transmission driven by the electric moor from the detected value of the angle, taking into account that radius related to the axis of rotation of the cable drum 4, on which the cable 5 is on the cable drum 4 is wound, the linear position of the receiving part 8 is determined.
- An offset between the linear positions determined by the two sensors 1 and 2 can, but does not have to be taken into account.
- the frame 10, in particular the vehicle frame, of the lifting device can preferably be moved on the floor of an industrial plant by means of wheels 11 rotatably mounted on it.
- Deflection rollers 6 are rotatably mounted on the frame 10, so that the rope 5 unwound from the cable drum 4 is guided over the deflection rollers to the receiving part 8.
- the receiving part 8 may thus be arranged on the side of the frame 10 facing away from the drive.
- the time-recurring determination of the linear position by the two sensors 1 and 2 is preferably carried out as comparable as possible.
- the actual position of the receiving part 8 is adjusted to a target position by the drive, the values detected by the first sensor 1 being used to determine the actual position.
- the linear positions determined from the first sensor 1 or from the second sensor 2 are used to determine the current difference, which is then based on the impermissibly high level Deviation is monitored.
- no object 9 is preferably received on the receiving part, so that the mass of the receiving part 8 is the same for each determination of the difference.
- the receiving part 8 is also always understood to be a receiving unit.
- the difference is stored in a first time period as a function of that linear position which is determined by the values detected by the first sensor 1, and in a second time period, which is temporally spaced from the first time period, the updated difference is stored as a function that linear position which is determined by the values detected by the first sensor 1. If this updated difference deviates impermissibly from the difference determined for the first period of time, the warning information is displayed, forwarded and / or output in good time, which indicates an impermissibly high rope elongation. Thus, the rope 5 can then be replaced in good time before a mechanical overload occurs.
- a surface area in particular a metallic surface area, reflects the radiation emitted by the second sensor, so that the sensor signal generated by the second sensor contains information about the distance between the surface area and the receiving part 8.
- the receiving part 8 is made in several parts, that is to say in several parts.
- control with the inverter is designed as an integrated device.
- the second sensor 2 is not attached to the frame, but rather is designed as a load measuring pin with strain gauges, with the load measuring pin is arranged between the cable 5 and the receiving part 8.
- a first area of the load measuring pin is connected to the receiving part 8 and a second area, which is spaced from the first area, of the load measuring pin is connected to the cable 5.
- the same kinematic sequence is brought about by the drive in a second time span as in a first time span, which is arranged temporally before the second time span.
- the same mass of the object 9 is received on the receiving part 8.
- the course of the linear position based on the values detected by the second sensor 2 is stored as a first function as a function of the linear position based on the values detected by the first sensor 1.
- a second function is formed when it expires in the second period of time. Then the maximum value of the convolution of the first with the second function is determined. The maximum value represents a shift of the second function against the first function. Then the integral of the amount of the difference between the first and the second function in a range of the linear positions is determined or the integral of the square of the difference between the first and the second function is determined .
- the warning information is displayed, forwarded and / or output in good time, which indicates an inadmissibly high rope elongation.
- the warning information is displayed, forwarded and / or output in good time, which indicates an impermissibly high rope elongation.
- I first sensor in particular first position detection sensor 2 second sensor, in particular second position detection sensor
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Civil Engineering (AREA)
- Control And Safety Of Cranes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020002810 | 2020-05-12 | ||
| PCT/EP2021/060124 WO2021228501A1 (de) | 2020-05-12 | 2021-04-19 | Verfahren zum betreiben eines hebegeräts und hebegerät zur durchführung eines verfahrens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4149878A1 true EP4149878A1 (de) | 2023-03-22 |
Family
ID=75639887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21720718.2A Pending EP4149878A1 (de) | 2020-05-12 | 2021-04-19 | Verfahren zum betreiben eines hebegeräts und hebegerät zur durchführung eines verfahrens |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4149878A1 (de) |
| DE (1) | DE102021002021A1 (de) |
| WO (1) | WO2021228501A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115043357B (zh) * | 2022-08-15 | 2022-11-04 | 烟台东方瑞创达电子科技有限公司 | 一种库内搬运整垛周转箱的专用agv与夹抱方法 |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4782920A (en) * | 1987-02-04 | 1988-11-08 | Cascade Corporation | Load-lifting mast especially adapted for use with automatically-guided vehicles |
| FI110454B (fi) * | 2001-06-20 | 2003-01-31 | Fastems Oy Ab | Menetelmä kuorman punnitsemiseksi ja kuormituksen valvomiseksi |
| US20060208893A1 (en) * | 2005-02-28 | 2006-09-21 | Anson Gary S | Weight audit methods and systems utilizing data reader |
| US10160395B2 (en) | 2012-06-21 | 2018-12-25 | James Allen Robinson | Vehicle-attached lifting and tool support device |
| WO2019130425A1 (ja) | 2017-12-26 | 2019-07-04 | 三菱電機株式会社 | エレベーター |
| JP2020007078A (ja) | 2018-07-05 | 2020-01-16 | 東芝エレベータ株式会社 | 報知装置及び報知方法 |
-
2021
- 2021-04-19 EP EP21720718.2A patent/EP4149878A1/de active Pending
- 2021-04-19 WO PCT/EP2021/060124 patent/WO2021228501A1/de not_active Ceased
- 2021-04-19 DE DE102021002021.9A patent/DE102021002021A1/de active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE102021002021A1 (de) | 2021-11-18 |
| WO2021228501A1 (de) | 2021-11-18 |
| CN115605423A (zh) | 2023-01-13 |
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