EP0557390A1 - Method and device for preventing the puncture of a load-sensing and pressure-compensating control system for a hydraulic crane. - Google Patents
Method and device for preventing the puncture of a load-sensing and pressure-compensating control system for a hydraulic crane.Info
- Publication number
- EP0557390A1 EP0557390A1 EP91920481A EP91920481A EP0557390A1 EP 0557390 A1 EP0557390 A1 EP 0557390A1 EP 91920481 A EP91920481 A EP 91920481A EP 91920481 A EP91920481 A EP 91920481A EP 0557390 A1 EP0557390 A1 EP 0557390A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- flow
- crane
- control
- maximum
- hydraulic
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
Definitions
- the present invention relates to a method for pre ⁇ venting the puncture of a load-sensing and pressure-com ⁇ pensating control system for a hydraulic crane when the hydraulic flow requested to the different functions of th crane exceeds the maximum hydraulic flow available.
- the invention further concerns a device for implementing the metho .
- Fig. 1 illustrates a conventional hydraulic crane which includes a body 1, a first boom section 2 articu ⁇ lated to the body 1 , an outer boom 3 articulated to the first boom section 2, and an extension boom 4 fixed to th outer boom 3.
- the first boom section is operated by means of a hydraulic lifting cylinder 5
- the outer boom 3 is operated by means of a hydraulic outer boom cylinder 6
- the extension boom 4 is operated by means of a hydraulic extension boom cylinder 7.
- the control.system for controlling the different crane functions (lifting/lowering by means of the lifting cylinder, tilting by means of the outer boom cylinder, and extending/retracting by means of the extension boom cylinder) comprises a pump 10 which pumps hydraulic fluid from a tank 9 to a directional-control-valve block 12 containing a directional-control-valve section for each of the cylinders 5-7, to which the hydraulic fluid is supplied in conventional manner as a function of the position of the slide member in each valve section.
- the directional-control-valve sections are remote-controlled by a control means 13 with one lever for each crane func ⁇ tion.
- the signals from the control means 13 are trans ⁇ mitted via a cable or a wireless connection to a micro- processor 16 which in turn controls the position of the slide members in the valve sections of the directional- control-valve block 12 as a function of the value of the respective control signal from the control means.
- the control system In advanced cranes, the control system, or more pre ⁇ cisely the directional-control-valve block 12, can be load-sensing and pressure-compensating, which means that a certain lever position on the control means 13 produces a certain flow to the associated crane function, regard ⁇ less of the load on this function and regardless of the flow to and load on the remaining crane functions.
- this only applies as long as the sum of the hydraulic flows requested by the levers of the control means 13 to the different crane functions, is smaller than or equal to the maximum hydraulic flow that the pump 10 can provide.
- the flow is primarily directed to the crane function(s) with the lightest load.
- the object of the present invention is, therefore, t provide a method and a device which solve the above-men ⁇ tioned problem and make it possible to use pumps with lower maximum flow without risking a puncture of the con ⁇ trol system.
- step c) is preferably repeated after the scaling down.
- the scale factors may then be so chosen that there is only a slight scaling down, since there will be a renewed check on whether the sum is smaller than the maximum-flow value, so that the scaling down can be repeated if need be.
- the scale factors can be the same for all the func ⁇ tions or, as recited in appended claim 3, be different for different crane functions, so that certain functions may be prioritised.
- the invention also concerns a device for implementing the method, which shows the features recited in appended claim 5.
- the invention can be applied to hydraulic cranes with load-sensing and pressure-compensating control systems.
- the crane functions of such a crane may, for instance, include lifting/lowering the first boom section, tilting the outer boom, extending/retracting the extension boom, lifting/lowering the jib boom, and rotating the crane.
- An embodiment of the present invention will be described below with reference to the accompanying draw ⁇ ings, in which Fig. 1, which already has been described, illustrates a conventional hydraulic crane with associated con ⁇ trol system, and Fig. 2 is a flow chart for implementing the method.
- the control signals from the control means are processed in the following manner (see the flow chart in Fig. 2).
- a first step 20 is measured the value of each of the control signals Q--Q N representing a flow requested to a crane function and being transmitted from the control means 13 to the micro ⁇ processor 16.
- the thus-estab ⁇ lished values of the control signals Q-,-Q N are added up, which gives the sum Q .
- the sum Q is, in step 22, compared with a maximum-flow value Q representing the maximum hydraulic flow available from the pump.
- the control signals Q. are, in step 24, scaled down to q., and the adding up of step 21 and the comparison of step 22 are repeated.
- the sum Q for the requested hydraulic flow still exceed the maximum-flow value Qma , another scaling down of the control signals is performed. If, on the other hand, the sum Q is smaller than or equal to the tr maximum-flow value Qmax, the control signals are, in step
- control-signal value need not be measured directly after the control means 13, but may instead be measured by establishing the displacement of the slide member in the valve 12 caused by the signal.
- the thus-established values are returned to the microprocessor 16, whereupon the method is implemented in the manner described above.
- This variant may be used not only in remote-controlled systems, but also in hand- lever-controlled, load-sensing and pressure-compensating valves.
Landscapes
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- Control And Safety Of Cranes (AREA)
- Jib Cranes (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9003656A SE467408B (en) | 1990-11-16 | 1990-11-16 | SETTING AND DEVICE FOR THE PREVENTION OF PUNCTIONING OF A LOADING AND PRESSURE COMPENSATING CONTROL SYSTEM FOR A HYDRAULIC CRANE |
SE9003656 | 1990-11-16 | ||
PCT/SE1991/000773 WO1992008666A1 (en) | 1990-11-16 | 1991-11-14 | Method and device for preventing the puncture of a load-sensing and pressure-compensating control system for a hydraulic crane |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0557390A1 true EP0557390A1 (en) | 1993-09-01 |
EP0557390B1 EP0557390B1 (en) | 1995-02-15 |
Family
ID=20380929
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91920481A Revoked EP0557390B1 (en) | 1990-11-16 | 1991-11-14 | Method and device for preventing the puncture of a load-sensing and pressure-compensating control system for a hydraulic crane |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0557390B1 (en) |
JP (1) | JPH06504512A (en) |
AT (1) | ATE118459T1 (en) |
DE (1) | DE69107472T2 (en) |
ES (1) | ES2068612T3 (en) |
SE (1) | SE467408B (en) |
WO (1) | WO1992008666A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0779239B2 (en) * | 1995-12-13 | 2006-09-13 | Liebherr-Werk Ehingen GmbH | Crane hoist control |
DK1490288T3 (en) * | 2001-11-28 | 2015-05-11 | Hojbjerg Maskinfabrik As | Load control system, preferably for boom cranes |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3638211A (en) * | 1969-10-08 | 1972-01-25 | Litton Systems Inc | Crane safety system |
US4222491A (en) * | 1978-08-02 | 1980-09-16 | Eaton Corporation | Crane operating aid and sensor arrangement therefor |
FR2504701A1 (en) * | 1981-04-22 | 1982-10-29 | Camiva | DEVICE FOR CONTROLLING AUTOMATIC CORRECTION OF DEVERS FOR DEPLOYABLE ORIENTABLE SCALE OR ARM-LIKE ARMOR ON VEHICLE |
DE3605462A1 (en) * | 1986-02-24 | 1987-08-27 | Mo N Proizv Ob Str Dorozh Mash | METHOD FOR SECURING SAFE OPERATION OF SELF-DRIVING Jib Cranes, AND SYSTEM FOR CARRYING OUT THE SAME |
-
1990
- 1990-11-16 SE SE9003656A patent/SE467408B/en not_active IP Right Cessation
-
1991
- 1991-11-14 ES ES91920481T patent/ES2068612T3/en not_active Expired - Lifetime
- 1991-11-14 AT AT91920481T patent/ATE118459T1/en not_active IP Right Cessation
- 1991-11-14 JP JP4500573A patent/JPH06504512A/en active Pending
- 1991-11-14 WO PCT/SE1991/000773 patent/WO1992008666A1/en not_active Application Discontinuation
- 1991-11-14 EP EP91920481A patent/EP0557390B1/en not_active Revoked
- 1991-11-14 DE DE69107472T patent/DE69107472T2/en not_active Revoked
Non-Patent Citations (1)
Title |
---|
See references of WO9208666A1 * |
Also Published As
Publication number | Publication date |
---|---|
SE9003656D0 (en) | 1990-11-16 |
ATE118459T1 (en) | 1995-03-15 |
SE467408B (en) | 1992-07-13 |
DE69107472T2 (en) | 1995-06-14 |
WO1992008666A1 (en) | 1992-05-29 |
SE9003656L (en) | 1992-05-17 |
ES2068612T3 (en) | 1995-04-16 |
DE69107472D1 (en) | 1995-03-23 |
JPH06504512A (en) | 1994-05-26 |
EP0557390B1 (en) | 1995-02-15 |
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