EP1150019B1 - Counter for registering the quantity of lifts of a crane - Google Patents
Counter for registering the quantity of lifts of a crane Download PDFInfo
- Publication number
- EP1150019B1 EP1150019B1 EP01104876A EP01104876A EP1150019B1 EP 1150019 B1 EP1150019 B1 EP 1150019B1 EP 01104876 A EP01104876 A EP 01104876A EP 01104876 A EP01104876 A EP 01104876A EP 1150019 B1 EP1150019 B1 EP 1150019B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- crane
- lifting
- load
- hydraulic
- pressure
- 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.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C15/00—Safety gear
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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
- B66C13/16—Applications of indicating, registering, or weighing devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
- F15B19/005—Fault detection or monitoring
Definitions
- the present invention relates to a hydraulic crane, according to the preamble of claim 1, preferably a lorry crane, a method, according to claim 7, for calculation of the fatigue stress of such a crane and a method, according to claim 5, for registration of the lifting up and putting down of a load in such a crane.
- Such a hydraulic crane is known from JP 57 154504.
- a hydraulic crane is, like all other mechanical constructions, subjected to an accumulating fatigue stress during use.
- the fatigue stress has reached a certain value large risks of crane breakdowns ensue, which can result in serious personal injuries or expensive damages to the crane itself or objects in the vicinity of the crane.
- a method today used for calculation of the accumulated fatigue stress of hydraulic cranes is based on that the operating time of the crane is registered by means of a time counter. In this connection it is normally registered the time during which the pump included in the hydraulic system is switched in. However, this constitutes a relatively bad measure of the accumulated fatigue stress of the crane, since one and the same crane often is used for many types of working operations having a very varying intensity.
- the object of the present invention is to achieve a hydraulic crane in which it is possible to calculate the accumulated fatigue stress of the crane in a simple and efficient manner.
- the crane comprises means connected to a pressure sensor in the lifting cylinder of the crane, which means is adapted to register the lifting up and the putting down of a load by detecting the velocity of the pressure variations in said cylinder, said registration means being adapted to register a lifting up and a putting down, respectively, of a load when the velocity of a detected pressure variation exceeds a predetermined value.
- Each lifting cycle is namely contributing in increasing the fatigue stress of the crane and the duration of a lifting cycle can vary from for instance 30 seconds, when the crane is used for excavation with a hydraulic bucket, up to several hours, when the crane is used in assembly work in order to for instance lift and position a transformer and to keep this in place until it has been fixed on the intended place.
- the total fatigue stress of the crane will be considerably higher than in the last mentioned case during one and the same time period.
- said registration means is connected to one or several sensors arranged to deliver information to said registration means concerning the control and/or movements of the crane, said registration means being adapted to determine by means of this information whether or not a lowering movement of the crane is taking place.
- the means is adapted not to register a lifting up of load when a rapid pressure variation in the cylinder is detected in connection with a determined lowering movement. In this way the means is prevented from being “fooled” by the rapid pressure variation caused by the induced pressure on the piston side of the cylinder that can ensue during lowering movements due to the fact that a certain pressure is required on the piston stem side in order to open the load holding valve of the hydraulic system.
- the invention also relates to a method for registration of the lifting up and putting down of a load in a hydraulic crane according to claim 5 and a method for calculation of the fatigue stress of a hydraulic crane according to claim 7.
- the expression operating means is used to designate the hydraulic force members which execute the crane movements ordered by the operator of the crane.
- the expression operating means consequently embraces the hydraulic cylinders 8, 9, 10, 14, 17 and 19 mentioned hereinbelow.
- the expression control device refers to the devices, for instance operating levers, by means of which the operator regulates the valve members included in the control system which control the flow of hydraulic fluid to the respective operating means.
- said valve members consist of so-called directional-control-valve sections.
- a hydraulic crane 1 attached to a frame 2 is shown, which frame for instance can be connected to a lorry chassis.
- the frame is provided with adjustable support legs 3 for supporting the crane 1.
- the crane comprises a column 4, which is rotatable in relation to the frame 2 around an essentially vertical axis.
- the crane further comprises an inner boom 5 articulately fastened to the column 4, an outer boom 6 articulately fastened to the inner boom 5 and an extension boom 7 displaceably fastened to the outer boom 6.
- the inner boom 5 is operated by means of a hydraulic lifting cylinder 8, the outer boom 6 by means of a hydraulic outer boom cylinder 9 and the extension boom 7 by means of a hydraulic extension boom cylinder 10.
- a rotator 11 is articulately fastened at the outer and of the extension boom, which rotator in its turn carries a hydraulic grab tool in the form of a bucket 12.
- Two bucket parts 13 included in the bucket 12 can be operated in relation to each other by means of a hydraulic grab cylinder 14 for opening and closing of the bucket 12.
- the rotator 11 is rotatable in relation to the extension boom 7 by means of not shown hydraulic operating means.
- the crane 1 is equipped for performing excavations.
- the rotator 11 and the bucket 12 can be removed and replaced by a lifting hook.
- the rotator 11 and the bucket 12 are replaced by a jib 15, see fig 2.
- the jib 15 comprises a jib boom 16, which is articulately fastened in relation to the extension boom 7 and operated by means of a hydraulic jib boom cylinder 17.
- the jib can further comprise an extension boom 18 which can be operated by means of a hydraulic extension boom cylinder 19.
- One and the same crane can consequently be used for a large number of different working operations, the intensity (lifting frequency) of which varies considerably.
- the crane 1 can also be provided with a hydraulically controllable winch, which can be used in combination with a lifting hook either with or without jib 15.
- the crane 1 can also be provided with other types of hydraulic grab tools than a bucket, for instance grab tools for handling scrap or pallets with building material such as stone or building plates.
- the control system for controlling the different crane functions i.e. lifting/lowering by means of the lifting cylinder 8, tilting by means of the outer boom cylinder 9, extension/retraction by means of the extension boom cylinder 10 etc, comprises a pump 20 which pumps hydraulic fluid from a reservoir 21 to a directional-control-valve block 22.
- the directional-control-valve block 22 comprises a directional-control-valve section 23 for each of the hydraulic operating means 8, 9, 10, 14, 17, 19, to which hydraulic fluid is supplied in a conventional manner depending on the position of the slide member in the respective valve section 23.
- the position of the slide members in the directional-control-valve sections 23 is controlled either via a number of control devices in the form of control levers 24, each of which being connected to its own slide member, or by remote control via a control unit 25, see fig 4, comprising a control lever for the respective slide member.
- control signals are transmitted via cable or a wireless connection from the control unit 25 to a microprocessor, which in its turn controls the position of the slide members in the valve sections 23 of the directional-control-valve block 22 depending on the magnitude of the respective control signal from the control unit 25.
- Each separate directional-control-valve section 23 consequently controls the size and the direction of the flow of hydraulic fluid to a specific operating means and thereby controls a specific crane function.
- a specific operating means for which a specific operating means is illustrated in fig 3.
- the directional-control-valve block 22 further comprises a shunt valve 26 pumping excessive hydraulic fluid back to the reservoir 21, and an electrically controlled dump valve 27 which can be caused to return the entire hydraulic flow from the pump directly to the reservoir 21.
- the directional-control-valve block.22 is of load-sensing and pressure-compensating type, which implies that the hydraulic flow supplied to an operating means is at all times proportional to the position of the slide member in the corresponding directional-control-valve section 23, i.e. proportional to the position of the lever 24.
- the directional-control-valve section 23 comprises a pressure-limiting device 28, a pressure-compensating device 29 and the directional-control-valve 30 proper.
- Directional-control-valve blocks and directional-control-valve sections of this type are well-known and available on market. However, also other types of directional-control-valves than the one described here can be used.
- a load holding valve 31 is arranged between the respective operating means and the associated directional-control-valve section 23, which load holding valve makes sure that the load will remain hanging when the hydraulic system runs out of pressure owing to the dump valve 27 being caused to return the entire hydraulic flow from the pump 20 directly to the reservoir 21.
- a sensor 32 is arranged on each of the directional-control-valve sections 23 in order to detect the movements of the valve slide member in the respective directional-control-valve section 23.
- These sensors 32 are connected to a processing unit 33 suitably constituted by a microprocessor.
- the processing unit 33 can obtain information that a certain valve slide member is influenced and thereby how the crane is controlled.
- the processing unit 33 can instead be adapted to obtain information about how the crane is controlled by reading the control signals transmitted from the control unit 25.
- the crane further comprises a load sensing means in the form of a pressure sensor 34 adapted to measure the hydraulic pressure in the lifting cylinder 8.
- the pressure sensor 34 is, just as the sensors 32 in the valve sections 23, connected to the processing unit 33.
- the crane 1 further comprises a means 36 adapted to register when the crane lifts up and puts down, respectively, a load.
- the means 36 which henceforth is denominated "lifting counter", registers this by detecting the velocity of the pressure variations in the lifting cylinder 8 of the crane, which pressure variations are measured by the pressure sensor 34 associated with the lifting cylinder 8.
- the pressure in the lifting cylinder 8 very rapidly increases just at the moment when the load is lifted up from the underlay and becomes free hanging. The same rapid pressure variation occurs when the load is put down and no more is carried by the crane.
- the lifting counter-36 via the sensors which register the movements of the slide members in the directional-control-valve sections 23, obtains information whether or not a lowering movement of the crane is taking place or not.
- the lifting counter 36 is adapted not to register a lifting up of a load when a rapid pressure variation in the lifting cylinder 8 takes place in connection with a simultaneous registration of a lowering movement.
- the crane can also be provided with other types of sensors than the ones here described in order to give the lifting counter 36 information whether or not the crane performs a lowering movement by detection of the control and/or the movements of the crane.
- the lifting counter 36 is suitably constituted by a microprocessor and is preferably connected to the processing unit 33, to which it transmits information concerning registered liftings up and puttings down of a load.
- the lifting counter 36 is shown as a unit separated from the processing unit 33, but it can with advantage be integrated with this.
- the crane 1 further comprises means 35, preferably integrated with the processing unit 33, for calculation of the accumulated fatigue stress of the crane, this means 35 being adapted to calculate said fatigue stress based on the number of registered liftings up and puttings down of a load by the lifting counter 36. It is here realised that a lifting up and a subsequent putting down of a load correspond to one performed lifting cycle.
- the calculated fatigue stress is presented to the operator and/or maintenance personal of the crane by means of suitable display means. It is also possible to let the processing unit 33 emit a signal or an alarm when the accumulated fatigue stress has attained a certain predetermined value.
- the information from a lifting counter 36 of the type here described can also be used for other functions in a crane than for calculation of accumulated fatigue stress.
- the information can for- instance be used in a system for controlling the maximum allowed lifting force of a hydraulic crane, as more closely described in a patent application filed simultaneously with the present patent application.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Control And Safety Of Cranes (AREA)
- Jib Cranes (AREA)
Abstract
Description
- The present invention relates to a hydraulic crane, according to the preamble of
claim 1, preferably a lorry crane, a method, according toclaim 7, for calculation of the fatigue stress of such a crane and a method, according toclaim 5, for registration of the lifting up and putting down of a load in such a crane. - Such a hydraulic crane is known from JP 57 154504.
- A hydraulic crane is, like all other mechanical constructions, subjected to an accumulating fatigue stress during use. When the fatigue stress has reached a certain value large risks of crane breakdowns ensue, which can result in serious personal injuries or expensive damages to the crane itself or objects in the vicinity of the crane. In order to make possible a safe and trouble-free operation of a crane it is therefor a great need of calculating the accumulated fatigue stres's of the crane. Based on such a calculated fatigue stress, it is possible to estimate the condition of the crane and its need of maintenance.
- A method today used for calculation of the accumulated fatigue stress of hydraulic cranes is based on that the operating time of the crane is registered by means of a time counter. In this connection it is normally registered the time during which the pump included in the hydraulic system is switched in. However, this constitutes a relatively bad measure of the accumulated fatigue stress of the crane, since one and the same crane often is used for many types of working operations having a very varying intensity.
- The object of the present invention is to achieve a hydraulic crane in which it is possible to calculate the accumulated fatigue stress of the crane in a simple and efficient manner.
- According to the present invention, this object is achieved in that the crane comprises means connected to a pressure sensor in the lifting cylinder of the crane, which means is adapted to register the lifting up and the putting down of a load by detecting the velocity of the pressure variations in said cylinder, said registration means being adapted to register a lifting up and a putting down, respectively, of a load when the velocity of a detected pressure variation exceeds a predetermined value.
- In this way liftings up and puttings down of load performed by the crane can be registered in a very simple manner and with simple and cheap means. By means of the liftings up and puttings down of load registered by the means it will be possible to determine the number of lifting cycles performed by the crane, which constitutes a measure well related to the accumulated fatigue stress of the crane. It has appeared that the number of performed lifting cycles constitutes a considerably better measure of the fatigue stress of the crane than the time during which the crane has been in operation. Each lifting cycle is namely contributing in increasing the fatigue stress of the crane and the duration of a lifting cycle can vary from for
instance 30 seconds, when the crane is used for excavation with a hydraulic bucket, up to several hours, when the crane is used in assembly work in order to for instance lift and position a transformer and to keep this in place until it has been fixed on the intended place. In the first mentioned case, the total fatigue stress of the crane will be considerably higher than in the last mentioned case during one and the same time period. - According to a preferred embodiment of the invention, said registration means is connected to one or several sensors arranged to deliver information to said registration means concerning the control and/or movements of the crane, said registration means being adapted to determine by means of this information whether or not a lowering movement of the crane is taking place. In this connection the means is adapted not to register a lifting up of load when a rapid pressure variation in the cylinder is detected in connection with a determined lowering movement. In this way the means is prevented from being "fooled" by the rapid pressure variation caused by the induced pressure on the piston side of the cylinder that can ensue during lowering movements due to the fact that a certain pressure is required on the piston stem side in order to open the load holding valve of the hydraulic system.
- The invention also relates to a method for registration of the lifting up and putting down of a load in a hydraulic crane according to
claim 5 and a method for calculation of the fatigue stress of a hydraulic crane according toclaim 7. - With reference to the enclosed drawings, a more specific description of embodiment examples of the invention will follow hereinbelow. It is shown in:
- Fig 1
- a sectional view of a hydraulic crane provided with a bucket,
- Fig 2
- a sectional view of a hydraulic crane provided with a jib,
- Fig 3
- a schematic view of an embodiment of the invention, and
- Fig 4
- a schematic view of a control unit with a number of control devices for control of different crane functions.
- In this description the expression operating means is used to designate the hydraulic force members which execute the crane movements ordered by the operator of the crane. The expression operating means consequently embraces the
hydraulic cylinders - In fig 1 a
hydraulic crane 1 attached to a frame 2 is shown, which frame for instance can be connected to a lorry chassis. The frame is provided withadjustable support legs 3 for supporting thecrane 1. The crane comprises a column 4, which is rotatable in relation to the frame 2 around an essentially vertical axis. The crane further comprises aninner boom 5 articulately fastened to the column 4, an outer boom 6 articulately fastened to theinner boom 5 and anextension boom 7 displaceably fastened to the outer boom 6. Theinner boom 5 is operated by means of ahydraulic lifting cylinder 8, the outer boom 6 by means of a hydraulicouter boom cylinder 9 and theextension boom 7 by means of a hydraulicextension boom cylinder 10. In the shown example a rotator 11 is articulately fastened at the outer and of the extension boom, which rotator in its turn carries a hydraulic grab tool in the form of abucket 12. Two bucket parts 13 included in thebucket 12 can be operated in relation to each other by means of ahydraulic grab cylinder 14 for opening and closing of thebucket 12. The rotator 11 is rotatable in relation to theextension boom 7 by means of not shown hydraulic operating means. - In the example shown in fig 1, the
crane 1 is equipped for performing excavations. When thecrane 1 is to be used for proper lifting operations the rotator 11 and thebucket 12 can be removed and replaced by a lifting hook. In order to perform lifting operations requiring a great range, the rotator 11 and thebucket 12 are replaced by ajib 15, see fig 2. Thejib 15 comprises ajib boom 16, which is articulately fastened in relation to theextension boom 7 and operated by means of a hydraulicjib boom cylinder 17. The jib can further comprise anextension boom 18 which can be operated by means of a hydraulicextension boom cylinder 19. One and the same crane can consequently be used for a large number of different working operations, the intensity (lifting frequency) of which varies considerably. - Besides the crane elements shown in fig 1 and 2, the
crane 1 can also be provided With a hydraulically controllable winch, which can be used in combination with a lifting hook either with or withoutjib 15. Thecrane 1 can also be provided with other types of hydraulic grab tools than a bucket, for instance grab tools for handling scrap or pallets with building material such as stone or building plates. - The control system for controlling the different crane functions, i.e. lifting/lowering by means of the
lifting cylinder 8, tilting by means of theouter boom cylinder 9, extension/retraction by means of theextension boom cylinder 10 etc, comprises a pump 20 which pumps hydraulic fluid from a reservoir 21 to a directional-control-valve block 22. The directional-control-valve block 22 comprises a directional-control-valve section 23 for each of the hydraulic operating means 8, 9, 10, 14, 17, 19, to which hydraulic fluid is supplied in a conventional manner depending on the position of the slide member in the respective valve section 23. The position of the slide members in the directional-control-valve sections 23 is controlled either via a number of control devices in the form ofcontrol levers 24, each of which being connected to its own slide member, or by remote control via acontrol unit 25, see fig 4, comprising a control lever for the respective slide member. In case of remote control, the control signals are transmitted via cable or a wireless connection from thecontrol unit 25 to a microprocessor, which in its turn controls the position of the slide members in the valve sections 23 of the directional-control-valve block 22 depending on the magnitude of the respective control signal from thecontrol unit 25. - Each separate directional-control-valve section 23 consequently controls the size and the direction of the flow of hydraulic fluid to a specific operating means and thereby controls a specific crane function. For the sake of clarity, only the directional-control-valve section 23 for the
lifting cylinder 8 is illustrated in fig 3. - The directional-control-
valve block 22 further comprises a shunt valve 26 pumping excessive hydraulic fluid back to the reservoir 21, and an electrically controlled dump valve 27 which can be caused to return the entire hydraulic flow from the pump directly to the reservoir 21. - In the shown embodiment, the directional-control-valve block.22 is of load-sensing and pressure-compensating type, which implies that the hydraulic flow supplied to an operating means is at all times proportional to the position of the slide member in the corresponding directional-control-valve section 23, i.e. proportional to the position of the
lever 24. The directional-control-valve section 23 comprises a pressure-limitingdevice 28, a pressure-compensating device 29 and the directional-control-valve 30 proper. Directional-control-valve blocks and directional-control-valve sections of this type are well-known and available on market. However, also other types of directional-control-valves than the one described here can be used. - A
load holding valve 31 is arranged between the respective operating means and the associated directional-control-valve section 23, which load holding valve makes sure that the load will remain hanging when the hydraulic system runs out of pressure owing to the dump valve 27 being caused to return the entire hydraulic flow from the pump 20 directly to the reservoir 21. - A sensor 32 is arranged on each of the directional-control-valve sections 23 in order to detect the movements of the valve slide member in the respective directional-control-valve section 23. These sensors 32 are connected to a
processing unit 33 suitably constituted by a microprocessor. By means of these sensors 32 theprocessing unit 33 can obtain information that a certain valve slide member is influenced and thereby how the crane is controlled. In case the valve slide members are regulated via aremote control unit 25, theprocessing unit 33 can instead be adapted to obtain information about how the crane is controlled by reading the control signals transmitted from thecontrol unit 25. - The crane further comprises a load sensing means in the form of a
pressure sensor 34 adapted to measure the hydraulic pressure in thelifting cylinder 8. Thepressure sensor 34 is, just as the sensors 32 in the valve sections 23, connected to theprocessing unit 33. - The
crane 1 further comprises ameans 36 adapted to register when the crane lifts up and puts down, respectively, a load. The means 36, which henceforth is denominated "lifting counter", registers this by detecting the velocity of the pressure variations in thelifting cylinder 8 of the crane, which pressure variations are measured by thepressure sensor 34 associated with thelifting cylinder 8. During lifting up of a load, the pressure in thelifting cylinder 8 very rapidly increases just at the moment when the load is lifted up from the underlay and becomes free hanging. The same rapid pressure variation occurs when the load is put down and no more is carried by the crane. These pressure variations are much more rapid than the pressure variations caused by the normal natural oscillations which at all times are present in the steel structure of the crane, and hereby the liftingcounter 36 can separate "liftings up" and "oscillations". A lifting up and a putting down, respectively, of a load is consequently registered when the velocity of the pressure variation in thelifting cylinder 8 exceeds a certain predetermined value. - When it comes to loads which are very small for the crane (approximately smaller than 10 % of the maximum capacity of the crane) it might be problematic to register a lifting up and a putting down of a load in the above described way. However, these small loads bring about a so small contribution to the accumulated fatigue stress that they can be neglected in this connection. However, a more serious complication for the lifting
counter 36 is the induced pressure on the piston side of the lifting cylinder that can ensue during lowering movements due to the fact that a certain pressure is required on the piston stem side in order to open theload holding valve 31 associated with thelifting cylinder 8. Practical tests have shown that this can give such a rapid pressure variation that it "fools" the lifting counter. However, this problem can be solved in that the lifting counter-36, via the sensors which register the movements of the slide members in the directional-control-valve sections 23, obtains information whether or not a lowering movement of the crane is taking place or not. In this connection, the liftingcounter 36 is adapted not to register a lifting up of a load when a rapid pressure variation in thelifting cylinder 8 takes place in connection with a simultaneous registration of a lowering movement. The crane can also be provided with other types of sensors than the ones here described in order to give the liftingcounter 36 information whether or not the crane performs a lowering movement by detection of the control and/or the movements of the crane. - The lifting
counter 36 is suitably constituted by a microprocessor and is preferably connected to theprocessing unit 33, to which it transmits information concerning registered liftings up and puttings down of a load. In fig 3 the liftingcounter 36 is shown as a unit separated from theprocessing unit 33, but it can with advantage be integrated with this. - The
crane 1 further comprises means 35, preferably integrated with theprocessing unit 33, for calculation of the accumulated fatigue stress of the crane, this means 35 being adapted to calculate said fatigue stress based on the number of registered liftings up and puttings down of a load by the liftingcounter 36. It is here realised that a lifting up and a subsequent putting down of a load correspond to one performed lifting cycle. The calculated fatigue stress is presented to the operator and/or maintenance personal of the crane by means of suitable display means. It is also possible to let theprocessing unit 33 emit a signal or an alarm when the accumulated fatigue stress has attained a certain predetermined value. - The information from a lifting
counter 36 of the type here described can also be used for other functions in a crane than for calculation of accumulated fatigue stress. The information can for- instance be used in a system for controlling the maximum allowed lifting force of a hydraulic crane, as more closely described in a patent application filed simultaneously with the present patent application. - The invention is of course not limited to the embodiments described above, a number of modifications thereof are on the contrary possible within the scope of the subsequent claims.
Claims (8)
- A hydraulic crane (1) comprising an inner boom (5), a hydraulic cylinder (8) for operating the inner boom (5), and a pressure sensor (34) arranged to measure the pressure in the hydraulic cylinder (8), characterized in that the crane (1) further comprises a means (36) connected to the pressure sensor (34), which means is adapted to register the lifting up and the putting down of a load by detecting the velocity of the pressure variations in said cylinder (8), said registration means (36) being adapted to register a lifting up and a putting down, respectively, of a load when the velocity of a detected pressure variation exceeds a predetermined value.
- A crane according to claim 1, characterized in that the means (36) consists of a microprocessor.
- A crane according to any of the preceding claims, characterized in that said registration means (36) is connected to one or several sensors (32) which are adapted to deliver information to said registration means (36) concerning the control and/or the movements of the crane, said registration means (36) being adapted to determine by means of this information whether or not a lowering movement of the crane (1) is taking place, and that said registration means (36) is adapted not to register a lifting up of a load when a rapid pressure variation in said cylinder (8) is detected in connection with a determined lowering movement.
- A crane according to any of the preceding claims, characterized in that the crane (1) further comprises means (35) for calculating the fatigue stress of the crane (1), said calculating means (35) being adapted to calculate the fatigue stress based on the number of liftings up and puttings down of load registered by the registration means (36).
- A method for registration of lifting up and putting down of a load in a hydraulic crane (1) comprising an inner boom (5), a hydraulic cylinder (8) for operating the inner boom (5), and a pressure sensor (34) for measuring the pressure in the hydraulic cylinder (8), characterized in that the lifting up and the putting down, respectively, of a load is registered by detection of the velocity of the pressure variations in said cylinder (8), a lifting up and a putting down, respectively, of a load being registered when the velocity of a detected pressure variation exceeds a predetermined value.
- A method according to claim 5, characterized in that it is determined by means of information from a sensor (32) concerning the controls and/or the movements of the crane whether or not a lowering movement of the crane (1) is taking place, and that a lifting up of a load is not registered when a rapid pressure variation in said cylinder (8) is detected in connection with a determined lowering movement.
- A method for calculation of the fatigue stress of a hydraulic crane (1) comprising an inner boom (5), a hydraulic cylinder (8) for operating the inner boom (5), and a pressure sensor (34) for measuring the pressure in the hydraulic cylinder (8), characterized in that the lifting up and the putting down, respectively, of a load is registered by detection of the velocity of the pressure variations in said cylinder (8), a lifting up and a putting down, respectively, of a load being registered when the velocity of a detected pressure variation exceeds a predetermined value, and that the fatigue stress is calculated based on the number of registered liftings up and puttings down of load.
- A method according to claim 7, characterized in that it is determined by means of information from sensors (32) concerning the control and/or the movements of the crane whether or not a lowering movement of the crane (1) is taking place, and that a lifting up of a load is not registered when a rapid pressure variation in said cylinder (8) is detected in connection with a determined lowering movement.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0001608A SE515089C2 (en) | 2000-04-28 | 2000-04-28 | Hydraulic crane with means for registration of lifting and reduction of load, procedure for such registration and method for calculating the fatigue load of such crane |
SE0001608 | 2000-04-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1150019A1 EP1150019A1 (en) | 2001-10-31 |
EP1150019B1 true EP1150019B1 (en) | 2003-08-13 |
Family
ID=20279513
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01104876A Expired - Lifetime EP1150019B1 (en) | 2000-04-28 | 2001-02-28 | Counter for registering the quantity of lifts of a crane |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1150019B1 (en) |
AT (1) | ATE247235T1 (en) |
DE (1) | DE60100577T2 (en) |
ES (1) | ES2204771T3 (en) |
SE (1) | SE515089C2 (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITMI20020891A1 (en) * | 2002-04-24 | 2003-10-24 | Cifa Spa | SYSTEM FOR THE CONTROL AND SURVEILLANCE OF THE OPERATION OF SELF-PROPELLED ARTICULATED ARM MACHINERY SUCH AS CONCRETE AND METAL PUMPS |
DE20208992U1 (en) | 2002-06-10 | 2003-10-23 | HAWE Hydraulik GmbH & Co. KG, 81673 München | Electro-hydraulic clamping device |
SE530761C2 (en) | 2005-12-14 | 2008-09-09 | Cargotec Patenter Ab | Hydraulic crane with registration of lifting and / or reduction of load, procedure for such registration and method for calculating the fatigue load of a hydraulic crane |
DE102009041661A1 (en) * | 2009-09-16 | 2011-03-24 | Liebherr-Werk Nenzing Gmbh, Nenzing | System for the automatic detection of load cycles of a machine for handling loads |
CN101746675B (en) * | 2009-12-31 | 2012-05-02 | 三一汽车制造有限公司 | Crane super lifting device, control system and control method thereof |
EP2982868B1 (en) * | 2014-08-06 | 2019-03-20 | Padoan S.r.l. | Hydraulic system and method for controlling hydraulic systems |
CA2971748C (en) * | 2014-12-24 | 2022-08-30 | Cqms Pty Ltd | A system and method of estimating fatigue in a lifting member |
DE102018105907A1 (en) * | 2018-03-14 | 2019-09-19 | Terex Deutschland GmbH | Method for determining the weight of a load and loading machine picked up by a loading machine therefor |
CN109058232A (en) * | 2018-10-09 | 2018-12-21 | 南京奥特自动化有限公司 | A kind of hydraulic lifting pressure measuring unit |
CN113479775B (en) * | 2021-06-28 | 2024-07-02 | 杭州鸿泉物联网技术股份有限公司 | Crane lifting load identification method and identification system |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57154504A (en) * | 1981-03-18 | 1982-09-24 | Komatsu Ltd | Load detector for unilateral-rod cylinder |
DE29503416U1 (en) * | 1995-03-02 | 1995-07-20 | Höhn, Carsten, Dipl.-Ing, 28832 Achim | Device for determining the dynamic stress on components, systems and machines |
DE19514050C2 (en) * | 1995-04-13 | 1999-06-02 | Bruger & Fischer Krananlagen U | Method and device for detecting loads on lifting and pulling devices |
-
2000
- 2000-04-28 SE SE0001608A patent/SE515089C2/en not_active IP Right Cessation
-
2001
- 2001-02-28 AT AT01104876T patent/ATE247235T1/en not_active IP Right Cessation
- 2001-02-28 DE DE60100577T patent/DE60100577T2/en not_active Expired - Lifetime
- 2001-02-28 EP EP01104876A patent/EP1150019B1/en not_active Expired - Lifetime
- 2001-02-28 ES ES01104876T patent/ES2204771T3/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
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SE0001608D0 (en) | 2000-04-28 |
ATE247235T1 (en) | 2003-08-15 |
ES2204771T3 (en) | 2004-05-01 |
DE60100577T2 (en) | 2004-06-24 |
SE0001608L (en) | 2001-06-11 |
DE60100577D1 (en) | 2003-09-18 |
EP1150019A1 (en) | 2001-10-31 |
SE515089C2 (en) | 2001-06-11 |
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