SE525907C2 - Method of a system with a pressurized medium for use and control of a lifting device especially in association with a working machine - Google Patents
Method of a system with a pressurized medium for use and control of a lifting device especially in association with a working machineInfo
- Publication number
- SE525907C2 SE525907C2 SE9801290A SE9801290A SE525907C2 SE 525907 C2 SE525907 C2 SE 525907C2 SE 9801290 A SE9801290 A SE 9801290A SE 9801290 A SE9801290 A SE 9801290A SE 525907 C2 SE525907 C2 SE 525907C2
- Authority
- SE
- Sweden
- Prior art keywords
- piston
- pressure chamber
- boom
- pressurized medium
- actuator
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000007246 mechanism Effects 0.000 claims abstract description 35
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 230000008901 benefit Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
-
- 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
- F15B11/044—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the return line, i.e. "meter out"
- F15B11/0445—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the return line, i.e. "meter out" with counterbalance valves, e.g. to prevent overrunning or for braking
-
- 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/06—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with jibs mounted for jibbing or luffing movements
- B66C23/08—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with jibs mounted for jibbing or luffing movements and adapted to move the loads in predetermined paths
- B66C23/10—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with jibs mounted for jibbing or luffing movements and adapted to move the loads in predetermined paths the paths being substantially horizontal; Level-luffing jib-cranes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/54—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with pneumatic or hydraulic motors, e.g. for actuating jib-cranes on tractors
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/30—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom
- E02F3/301—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom with more than two arms (boom included), e.g. two-part boom with additional dipper-arm
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/36—Component parts
- E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
- E02F3/43—Control of dipper or bucket position; Control of sequence of drive operations
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/36—Component parts
- E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
- E02F3/43—Control of dipper or bucket position; Control of sequence of drive operations
- E02F3/435—Control of dipper or bucket position; Control of sequence of drive operations for dipper-arms, backhoes or the like
- E02F3/436—Control of dipper or bucket position; Control of sequence of drive operations for dipper-arms, backhoes or the like for keeping the dipper in the horizontal position, e.g. self-levelling
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2203—Arrangements for controlling the attitude of actuators, e.g. speed, floating function
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2221—Control of flow rate; Load sensing arrangements
- E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2221—Control of flow rate; Load sensing arrangements
- E02F9/2225—Control of flow rate; Load sensing arrangements using pressure-compensating valves
- E02F9/2228—Control of flow rate; Load sensing arrangements using pressure-compensating valves including an electronic controller
-
- 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/20—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors controlling several interacting or sequentially-operating members
- F15B11/205—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors controlling several interacting or sequentially-operating members the position of the actuator controlling the fluid flow to the subsequent actuator
-
- 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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/3056—Assemblies of multiple valves
- F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/31—Directional control characterised by the positions of the valve element
- F15B2211/3105—Neutral or centre positions
- F15B2211/3116—Neutral or centre positions the pump port being open in the centre position, e.g. so-called open centre
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
- F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
- F15B2211/50545—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using braking valves to maintain a back pressure
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
- F15B2211/505—Pressure control characterised by the type of pressure control means
- F15B2211/50563—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure
- F15B2211/50581—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure using counterbalance valves
- F15B2211/5059—Pressure control characterised by the type of pressure control means the pressure control means controlling a differential pressure using counterbalance valves using double counterbalance valves
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/615—Filtering means
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
- F15B2211/7051—Linear output members
- F15B2211/7053—Double-acting output members
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
- F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
- F15B2211/7114—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators
- F15B2211/7121—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators the chambers being connected in series
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Analytical Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Automation & Control Theory (AREA)
- Fluid-Pressure Circuits (AREA)
- Forklifts And Lifting Vehicles (AREA)
- Operation Control Of Excavators (AREA)
Abstract
Description
En lyftbomsinrättning av ovan nämnd typ manövreras på ett så- dant sätt att t ex när lasten skall flyttas i riktning mot huvudbom- men, används den första kolvcylindermekanismen för att svänga den mellanliggande bommen uppåt och samtidigt sänks den fria änden hos ytterbommen med den andra kolvcylindermekanismen på motsvarande sätt, varvid manövreringen givetvis utförs i om- vänd ordning för att förflytta lasten i riktning från huvudbommen. A lifting boom device of the above-mentioned type is operated in such a way that, for example, when the load is to be moved in the direction of the main boom, the first piston-cylinder mechanism is used to pivot the intermediate boom upwards and at the same time lower the free end of the outer boom with the second piston-cylinder mechanism in a corresponding manner, whereby the maneuvering is of course carried out in reverse order to move the load in the direction from the main boom.
Lastens vikt kommer att inducera en viss trycknivå i varje kolvcy- lindermekanism. För överföring av kraften iväg från huvudbom- men kommer inget tryck från trycksättningsenheten att krävas för styrning av den första kolvcylindermekanismen på grund av gra- vitationseffekten, medan fullt tryck krävs för styrning av den andra kolvcylindermekanismen. Således kommer, i ett hydraul- system där kolvcylindermekanismerna är anslutna till hydraul- systemet med fullständigt oberoende flödeskanaler i enlighet med den tidigare tekniken, arbetstrycket alltid vara bestämt av det erforderliga maximaltrycket. Som en konsekvens därav kom- mer, om båda kolvcylindermekanismerna är lika till storleken, hälften av energin producerad med trycksättningsenheten alltid att omvandlas till värmeförluster. Vidare underkastas cylindrarna mycket lätt för kavitation. Detta beror på faktumet att trycket or- sakat av lasten och av massan hos lyftbomsinrättningen själv di- rigerar ett starkt flöde till returportarna hos kolvcylindermeka- nismerna, och det är inte möjligt att tillhandahålla en ersättning av det trycksatta medlet genom ventilarrangemangen till inloppen med en tillräcklig hastighet. Dessutom är det svårt att använda lyftbomsinrättningen för flyttning av en last eller liknande spe- ciellt i horisontalriktnlngen, därför att samtidig användning av båda kolvcylindermekanismerna är nödvändig, och dessa styrs separat men samtidigt med två arbetsventiler. Ändamålet med förfarandet enligt uppfinningen är att tillhanda- hålla en klar reducering av problemen presenterade ovan och således förbättra den tidigare tekniken väsentligt. För att nå detta ändamål är förfarandet enligt uppfinningen primärt känne- 10 15 20 25 30 35 tecknat av det som presenteras i den kännetecknande delen av det bifogade patentkravet 1.The weight of the load will induce a certain pressure level in each piston-cylinder mechanism. To transfer the force away from the main boom, no pressure from the pressurizing unit will be required to control the first piston-cylinder mechanism due to the gravitational effect, while full pressure is required to control the second piston-cylinder mechanism. Thus, in a hydraulic system where the piston-cylinder mechanisms are connected to the hydraulic system with completely independent flow channels in accordance with the prior art, the working pressure will always be determined by the required maximum pressure. As a consequence, if both piston-cylinder mechanisms are equal in size, half of the energy produced with the pressurizing unit will always be converted into heat losses. Furthermore, the cylinders are very easily subjected to cavitation. This is due to the fact that the pressure caused by the load and by the mass of the boom assembly itself directs a strong flow to the return ports of the piston-cylinder mechanisms, and it is not possible to provide a replacement of the pressurized means through the valve arrangements to the inlets with a sufficient speed. In addition, it is difficult to use the lifting boom device for moving a load or the like especially in the horizontal direction, because simultaneous use of both piston-cylinder mechanisms is necessary, and these are controlled separately but simultaneously with two working valves. The object of the method according to the invention is to provide a clear reduction of the problems presented above and thus to significantly improve the prior art. To achieve this object, the method according to the invention is primarily characterized by what is presented in the characterizing part of the appended claim 1.
De viktigaste generella fördelarna med förfarandet enligt denna uppfinning inkluderar dess enkelhet, realiserbarhet och effektivi- tet. Vid användande av förfarandet är det möjligt att göra även mycket massiva konstruktioner med tryckenheter och kolvcylin- dermekanismer med väsentligt mindre kapaciteter än de hos konventionella system. Vidare är det möjligt att reducera kvanti- teten av det trycksatta mediet som cirkuleras så mycket som till hälften av kvantiteten använd i nuvarande system. Dessutom, speciellt i lyftbomsinrättningar, reduceras krafterna och momen- ten riktade från kolvcylindermekanismerna till lyftbomsinrätt- ningen signifikant jämfört med de nuvarande; som en konsekvens härav är det t o m möjligt att göra konstruktionen av lyftbomsin- rättningen mindre komplex och om nödvändigt mindre massiv.The main general advantages of the method of this invention include its simplicity, feasibility and efficiency. When using the method, it is possible to make even very massive constructions with pressure units and piston-cylinder mechanisms with significantly smaller capacities than those of conventional systems. Furthermore, it is possible to reduce the quantity of the pressurized medium that is circulated as much as to half the quantity used in the current system. In addition, especially in lifting boom devices, the forces and torques directed from the piston-cylinder mechanisms to the lifting boom device are significantly reduced compared to the current ones; as a consequence, it is even possible to make the construction of the boom structure less complex and, if necessary, less massive.
Således har uppfinningen i detta hänseende också fördelen av signifikant bättre effektivitet och verkningsgrad än nuvarande förfaranden. En annan fördel med förfarandet i enlighet med uppfinningen är lättare styrning av systemet med trycksatt me- dium, varvid applikationen av förfarandet oftast inte kräver styr- ning av två oberoende kolvcylindermekanismer med separata ar- betsventiler. Förfarandet enligt uppfinningen gör det också möj- ligt att väsentligt reducera problemen med kavitation.Thus, in this respect, the invention also has the advantage of significantly better efficiency and effectiveness than current methods. Another advantage of the method according to the invention is easier control of the system with pressurized medium, whereby the application of the method usually does not require control of two independent piston-cylinder mechanisms with separate working valves. The method according to the invention also makes it possible to significantly reduce the problems of cavitation.
Fördelaktiga utföringsformer av förfarandet enligt uppfinningen kommer att presenteras i beroendekraven relaterade till förfaran- det. l den följande beskrivningen kommer uppfinningen att beskrivas i detalj med hänvisning till de bifogade ritningarna, i vilka Fig 1 visar ett fördelaktigt funktionsschema relaterat till ett sy- stem med trycksatt medium vid applicering av förfarandet enligt uppfinningen, och 10 15 20 25 30 35 Fig 2 visar en fördelaktig lyftbomsinrättning med applicering av förfarandet och system med trycksatt medium i enlighet med uppfinningen, sedd från sidan.Advantageous embodiments of the method according to the invention will be presented in the dependent claims related to the method. In the following description, the invention will be described in detail with reference to the accompanying drawings, in which Fig. 1 shows an advantageous operating diagram related to a system with pressurized medium when applying the method according to the invention, and Fig. 2 shows an advantageous lifting boom device with application of the method and system with pressurized medium in accordance with the invention, seen from the side.
Uppfinningen avser ett förfarande för ett system med trycksatt medium innefattande åtminstone två kolvcylindermekanismer 1, 2 (senare manövreringsorgan) som använder ett trycksatt medium; en tryckenhet P, såsom en eller flera pumpar för trycksättning av mediumet; och en styrenhet V med ett ventiiarrangemang 4, 5 för manövrering av nämnda manövreringsorgan 1, 2 genom tran- sportering av trycksatt medium till deras tryckkamrar som skall fyllas vid den tidpunkten och, på ett motsvarande sätt, genom deplacering av trycksatt medium från deras tryckkamrar som skall tömmas vid tidpunkten. För att förbättra effektiviteten hos systemet med trycksatt medium, speciellt under samtida använd- ning av manövreringsorganen 1, 2, är manövreringsorganen 1, 2 kopplade för att arbeta i serie så att trycksatt medium som skall bortskaffas transporteras från tryckkammaren hos ett manövre- ringsorgan 1 eller 2, som skall tömmas, till tryckkammaren hos det andra manövreringsorganet 2 eller 1, som skall fyllas. Det trycksatta mediumet returernas till styrenheten V från tryckkam- maren hos det andra manövreringsorganet 2 eller 1, som skall tömmas.The invention relates to a method for a system with pressurized medium comprising at least two piston-cylinder mechanisms 1, 2 (later actuators) using a pressurized medium; a pressure unit P, such as one or more pumps for pressurizing the medium; and a control unit V having a valve arrangement 4, 5 for actuating said actuators 1, 2 by transporting pressurized medium to their pressure chambers to be filled at that time and, correspondingly, by displacing pressurized medium from their pressure chambers which shall be emptied at the time. To improve the efficiency of the pressurized medium system, especially during simultaneous use of the actuators 1, 2, the actuators 1, 2 are connected to operate in series so that pressurized medium to be disposed of is transported from the pressure chamber of an actuator 1 or 2, to be emptied, to the pressure chamber of the second actuator 2 or 1, to be filled. The pressurized medium is returned to the control unit V from the pressure chamber of the second actuator 2 or 1, which is to be emptied.
Förfarandet enligt uppfinningen appliceras fördelaktigt, i enlighet med arbetsprincipen visad i fig 1, i ett system med trycksatt me- dium som har två manövreringsorgan 1, 2, vilka styrs av två ar- betsventiler 4, 5 hos styrenheten V medelst trycksatt medium le- vererat via ett flödesarrangemang, såsom primära 6a, 7a och se- kundära ledningar 6b, 7b, anslutna till arbetsventilerna 4, 5. Åt- minstone under samtidig användning av manövreringsorganen 1, 2 leds trycksatt medium med styrenheten V, såsom av den första eller andra arbetsventilen 4 eller 5, till ett manövreringsorgan, såsom till den första eller den andra tryckcylindern 1 eller 2, från vilken det trycksatta mediumet som skall bortskaffas vidare transporteras till nästa manövreringsorgan 2 eller 1 och returne- ras till styrenheten V. 10 15 20 25 30 35 l en speciellt fördelaktig utföringsform, fortfarande med hänvis- ning till principen visad i fig 1, transporteras under samtidig an- vändning av manövreringsorgan 1, 2 trycksatt medium med styr- enheten V, t ex från den primära porten 5A hos den andra ar- betsventilen 5 till den andra tryckkammaren C2 hos det första manövreringsorganet 1, som skall fyllas. Därnåst transporteras det trycksatta mediumet vidare från den första tryckkammaren C1 hos det första manövreringsorganet 1, som skall tömmas, till den andra tryckkammaren D2 hos det andra manövreringsorganet 2, som skall fyllas. Efter detta returneras det trycksatta mediumet från den första tryckkammaren D1 hos det andra manövrerings- organet 2, som skall tömmas, till styrenheten V, t ex till den se- kundära porten 5B hos den andra arbetsventilen 5.The method according to the invention is advantageously applied, in accordance with the working principle shown in Fig. 1, in a system with pressurized medium having two operating means 1, 2, which are controlled by two working valves 4, 5 of the control unit V by means of pressurized medium delivered via a flow arrangement, such as primary 6a, 7a and secondary lines 6b, 7b, connected to the working valves 4, 5. At least during simultaneous use of the operating means 1, 2, pressurized medium is led with the control unit V, as by the first or second working valve 4 or 5, to an actuator, such as to the first or the second pressure cylinder 1 or 2, from which the pressurized medium to be disposed of is further transported to the next actuator 2 or 1 and returned to the control unit V. 10 15 20 25 30 35 In a particularly advantageous embodiment, still with reference to the principle shown in Fig. 1, is transported under simultaneous use of operating means 1, 2 pressurized medium with the control unit V, for example from the primary port 5A of the second working valve 5 to the second pressure chamber C2 of the first actuator 1 to be filled. Next, the pressurized medium is transported further from the first pressure chamber C1 of the first actuator 1 to be emptied to the second pressure chamber D2 of the second actuator 2 to be filled. After this, the pressurized medium is returned from the first pressure chamber D1 of the second actuator 2, which is to be emptied, to the control unit V, for example to the secondary port 5B of the second working valve 5.
I en situation då systemet med trycksatt medium används i om- vänd ordning transporteras under samtidig användning av ma- növreringsorgan 1, 2 trycksatt medium via styrenheten V, dvs från den sekundära porten 5B hos den andra arbetsventilen 5, till den första tryckkammaren D1 hos det andra manövreringsorga- net 2, som skall fyllas, varefter det trycksatta mediumet tran- sporteras vidare från den andra tryckkammaren D2 hos det andra manövreringsorganet 2, som skall tömmas, till den första tryck- kammaren C1 hos det första manövreringsorganet 1, som skall fyllas. Det trycksatta mediumet returneras sedan från den andra tryckkammaren C2 hos det första manövreringsorganet 1, som skall tömmas, till styrenheten V, dvs till den primära porten 5A hos den andra arbetsventilen 5.In a situation where the system with pressurized medium is used in reverse order, during simultaneous use of operating means 1, 2 pressurized medium is transported via the control unit V, i.e. from the secondary port 5B of the second working valve 5, to the first pressure chamber D1 of the the second actuator 2 to be filled, after which the pressurized medium is transported further from the second pressure chamber D2 of the second actuator 2 to be emptied to the first pressure chamber C1 of the first actuator 1 to be filled. The pressurized medium is then returned from the second pressure chamber C2 of the first actuator 1 to be emptied to the control unit V, i.e. to the primary port 5A of the second working valve 5.
I en speciellt fördelaktig utföringsform av förfarandet hänvisas till fig 2 som visar ett system med trycksatt medium i anslutning till en så kallad lyftbomsinrättning. Denna typ av en hydraulisk lyft- bomsinrättning X skall placeras i förbindelse med en arbetsma- skin, såsom en traktor, en skogsavverkningsmaskin eller en grävmaskin, och i sin driftsituation innefattar lyftbomsinrättningen en väsentligen vertikal huvudbom X1 med sin undre, första ände förbunden med arbetsmaskinen och dess andra ände är lagrad i 10 15 20 25 30 35 r' fx " 4* 51-] den första änden hos mellanliggande bom X2 vilken vidare är, i sin andra ände, lagrad i den första änden av ytterbommen X3, varvid den andra änden hos ytterbommen X3 är anordnad med medel för fixering av en last, arbetsverktyg eller liknande som skall flyttas med lyftbomsinrättningen. Lyftbomsinrättningen är företrädesvis manövrerad med två kolvcylindermekanismer 1, 2 (senare manövreringsorgan), varvid det första manövreringsor- ganet 1 som ansluter huvudbommen X1 och den mellanliggande bommen X2 används för att effektuera en förflyttning av den andra änden hos ytterbommen X3 väsentligen i den vertikala riktningen och, på ett motsvarande sätt, effektueras den hori- sontella förflyttningen av den andra änden hos ytterbommen X3 med användning av det andra manövreringsorganet 2, som för- binder den mellanliggande bommen X2 med ytterbommen X3, tillsammans med nämnda första manövreringsorgan 1. l en utfö- ringsform av detta slag utnyttjas förfarandet enligt uppfinningen under samtidigt användande av manövreringsorgan 1, 2, dvs till exempel vid horisontella förflyttningar av änden hos lyftbomsin- rättningen, genom användning av deplaceringsenergin hos det trycksatta mediumet levererat till manövreringsorganet 1 för drift av det andra manövreringsorganet 2 genom koppling av flödes- kanalerna hos flödesarrangemanget så att de går ihop och är åt- minstone delvis gemensamma som visat i schemat i fig 1; den första sektionen 7I av primärledningen 7a hos det andra manöv- reringsorganet 2 till den sekundära ledningen 6b hos den första tryckcylindern 1 för transportering av trycksatt medium till tryck- kammaren C2, och den andra sektionen 7II av primärledningen 7a till primärledningen 6a hos den första tryckcylindern 1 för an- slutning av tryckkammaren C1 till tryckkammaren D2 hos den andra tryckcylindern 2. Som en konsekvens härav sker änd- ringarna i längd av manövreringsorganen 1, 2 i samma riktning.In a particularly advantageous embodiment of the method, reference is made to Fig. 2, which shows a system with pressurized medium in connection with a so-called lifting boom device. This type of hydraulic boom device X is to be placed in connection with a work machine, such as a tractor, a logging machine or an excavator, and in its operating situation the boom device comprises a substantially vertical main boom X1 with its lower, first end connected to the machine and its second end is mounted in the first end of the intermediate boom X2 which is further, at its second end, mounted in the first end of the outer boom X3, the second end of the outer boom X3 is provided with means for fixing a load, work tool or the like to be moved with the lifting boom device.The lifting boom device is preferably operated by two piston-cylinder mechanisms 1, 2 (later operating means), the first actuating member 1 connecting the main boom X1 and the main boom intermediate boom X2 is used to effect a movement of the other end of the outer boom X3 substantially in the vertical direction and, in a corresponding manner, the horizontal movement of the second end of the outer boom X3 is effected using the second actuator 2, which connects the intermediate boom X2 to the outer boom X3, together with said first actuator 1. in a embodiment of this kind, the method according to the invention is used while simultaneously operating actuators 1, 2, i.e. for example in horizontal movements of the end of the boom device, by using the displacement energy of the pressurized medium supplied to the actuator 1 for operation of the second actuator 2 by coupling the flow channels of the flow arrangement so that they merge and are at least partially common as shown in the diagram in Fig. 1; the first section 7I of the primary line 7a of the second actuator 2 to the secondary line 6b of the first pressure cylinder 1 for transporting pressurized medium to the pressure chamber C2, and the second section 7II of the primary line 7a to the primary line 6a of the first pressure cylinder 1 for connecting the pressure chamber C1 to the pressure chamber D2 of the second pressure cylinder 2. As a consequence, the changes in the length of the actuators 1, 2 take place in the same direction.
I ett annat fördelaktigt utförande levereras trycksatt medium från primärporten 5A hos arbetsventilen 5 till tryckkammaren C2 hos det första manövreringsorganet 1, som skall fyllas. På ett mot- svarande sätt avlägsnas trycksatt medium från tryckkammaren C1 hos det första manövreringsorganet 1, som skall tömmas, till 10 15 20 25 30 35 tryckkammaren D2 hos det andra manövreringsorganet 2, som skall fyllas, varefter det trycksatta mediumet först returneras från tryckkammaren D1 hos det andra manövreringsorganet 2, som skall tömmas, till sekundärporten 5b hos den andra arbetsventi- len 5. Ovanstående process motsvarar t ex förflyttning en last vid änden av Iyftbomsinrättningen utåt, varvid den mellanliggande bommen X2 svänger nedåt och samtidigt trycker den andra än- den hos ytterbommen X3 iväg från huvudbommen X1. Vid appli- kation av förfarandet inducerar vikten av lasten ett väsentligen lika stort tryck på båda manövreringsorganen 1, 2. Vidare är det i detta sammanhang möjligt att använda lämpliga manövreringsor- gansvolymer för att uppnå deras lämpliga förflyttningsrelationer, speciellt vid en strävan att underlätta väsentligen horisontella förflyttningar. Således kommer, vid användning av systemet med trycksatt medium enligt uppfinningen för att flytta en last, ett op- timalt lågt tryck att krävas, därför att trycket hos lyftmanövre- ringsorganet 1 självt används direkt för drift av det andra manöv- reringsorganet 2. Av samma skäl är också den erforderliga ol- jekvantiteten så liten som möjligt, därför att olja levereras nu en- dast till det första manövreringsorganet 1.In another advantageous embodiment, pressurized medium is delivered from the primary port 5A of the working valve 5 to the pressure chamber C2 of the first actuator 1 to be filled. Correspondingly, pressurized medium is removed from the pressure chamber C1 of the first actuator 1 to be emptied to the pressure chamber D2 of the second actuator 2 to be filled, after which the pressurized medium is first returned from the pressure chamber D1. of the second actuator 2 to be emptied to the secondary port 5b of the second working valve 5. The above process corresponds, for example, to moving a load at the end of the lifting boom device outwards, the intermediate boom X2 pivoting downwards and at the same time pushing the other end of the outer boom X3 away from the main boom X1. When applying the method, the weight of the load induces a substantially equal pressure on both actuators 1, 2. Furthermore, in this context it is possible to use suitable actuator volumes to achieve their suitable displacement relations, especially in an effort to facilitate substantially horizontal transfers. Thus, when using the system with pressurized medium according to the invention to move a load, an optimally low pressure will be required, because the pressure of the lifting actuator 1 itself is used directly for operation of the second actuator 2. By the same For this reason, the required quantity of oil is also as small as possible, because oil is now only delivered to the first actuator 1.
För att flytta lasten i riktning mot huvudbommen X1 levereras trycksatt medium på ett motsvarande sätt från sekundärporten 5B hos den andra arbetsventilen 5 till tryckkammaren D1 hos det andra manövreringsorganet 2, som skall fyllas. Trycksatt medium avlägsnas från tryckkammaren D2 hos det andra manövrerings- organet 2, som skall tömmas, på ett motsvarande sätt till tryck- kammaren C1 hos det första manövreringsorganet 1, som skall fyllas. Därefter returneras hydraulfluidumet från tryckkammaren C2 hos det första manövreringsorganet 1, som skall tömmas, till primärporten 5A hos den andra arbetsventilen 5. Också i detta fall är det erforderliga drifttrycket så lågt som möjligt, därför att den mellanliggande bommen X2 inducerar ett tryck i manövre- ringsorganet 2, som således tenderar att förlänga det första ma- növreringsorganet 1. l enlighet med vad som presenterades ovan är kvantiteten av oljan som skall cirkuleras också i detta fall 10 15 20 25 30 35 hälften av den som krävs vid användning av konventionella förfa- randen.To move the load in the direction of the main boom X1, pressurized medium is delivered in a corresponding manner from the secondary port 5B of the second working valve 5 to the pressure chamber D1 of the second actuator 2, which is to be filled. Pressurized medium is removed from the pressure chamber D2 of the second actuator 2 to be emptied in a corresponding manner to the pressure chamber C1 of the first actuator 1 to be filled. Thereafter, the hydraulic fluid is returned from the pressure chamber C2 of the first actuator 1 to be emptied to the primary port 5A of the second working valve 5. Also in this case, the required operating pressure is as low as possible, because the intermediate boom X2 induces a pressure in the actuator. thus tending to extend the first actuator 1. In accordance with what has been presented above, the quantity of oil to be circulated is also in this case half of that required when using conventional procedures. the edges.
Som visat i fig 1 och 2 kan den rena lyftförflyttningen, dvs sväng- ningen uppåt av den mellanliggande bommen X2, fördelaktigt för- rättas genom leverering av det trycksatta mediumet genom ut- gångsporten hos den första arbetsventilen 4, dvs genom primär- porten 4A, till den första tryckkammaren C1 hos det första ma- növreringsorganet 1, varvid den andra tryckkammaren C2 år för- bunden med returporten hos den första arbetsventilen, dvs med sekundärporten 4B. När den andra arbetsventilen 5 är stängd är också den första tryckkammaren D1 hos det andra manövre- ringsorganet 2 stängd, och detta andra manövreringsorgan 2 är förhindrat att röra sig fastän trycket är verksamt i dess andra tryckkammare D2. På ett motsvarande sätt förrättas den rena sänkningsrörelsen, dvs svängningen nedåt av den mellanlig- gande bommen X2, i motsatt ordning genom leverering av de trycksatta fluidumet genom sekundärporten 4B hos den första ar- betsventilen 4 till den andra tryckkammaren C2 hos det första manövreringsorganet 1, varvid, på ett motsvarande sätt, dess första tryckkammare C1 är ansluten till primärporten 4A hos den första arbetsventilen. Också i detta fall är den andra arbetsven- tilen 5 stängd, och trycket har ingen effekt någon annanstans.As shown in Figs. 1 and 2, the pure lifting movement, i.e. the upward oscillation of the intermediate boom X2, can advantageously be performed by delivering the pressurized medium through the outlet port of the first working valve 4, i.e. through the primary port 4A, to the first pressure chamber C1 of the first actuator 1, the second pressure chamber C2 being connected to the return port of the first working valve, i.e. to the secondary port 4B. When the second working valve 5 is closed, the first pressure chamber D1 of the second actuator 2 is also closed, and this second actuator 2 is prevented from moving even though the pressure is effective in its second pressure chamber D2. In a corresponding manner, the pure lowering movement, i.e. the downward oscillation of the intermediate boom X2, is performed in the opposite order by delivering the pressurized fluid through the secondary port 4B of the first working valve 4 to the second pressure chamber C2 of the first actuator 1, wherein, in a corresponding manner, its first pressure chamber C1 is connected to the primary port 4A of the first working valve. Also in this case the second working valve 5 is closed, and the pressure has no effect elsewhere.
För balansering av operationerna beskrivna ovan inkluderar funktionsschemat i fig 1 också en så kallad Iastsänkningsventil 3 för förhindrandet av några oavsiktliga förflyttningar av det andra manövreringsorganet 2.To balance the operations described above, the operating diagram in Fig. 1 also includes a so-called lowering valve 3 for preventing any unintentional movements of the second actuator 2.
Det är uppenbart att arbetsventilerna 4 och 5 också kan använ- das samtidigt, i det fallet då förflyttning av lyftbomsinrättningen är en komplex förflyttning innefattande dynamiska komponenter valda i enlighet med behovet och producerade å ena sidan med drift av den första arbetsventilen 4 som beskriven ovan, och å andra sidan med funktioner hos den andra arbetsventilen 5 som beskriven ovan. Som en konsekvens härav gör förfarandet enligt uppfinningen det möjligt att utföra en förflyttning i en viss riktning med enkel styrning, såväl som att utföra banorna fullständigt (fritt/godtyckligt) om nödvändigt. Dessa mångsidiga operationer kan styras med endast två arbetsventiler 4, 5.It is obvious that the working valves 4 and 5 can also be used simultaneously, in the case where movement of the lifting boom device is a complex movement comprising dynamic components selected according to the need and produced on the one hand with operation of the first working valve 4 as described above. and on the other hand with functions of the second working valve 5 as described above. As a consequence of this, the method according to the invention makes it possible to carry out a movement in a certain direction with simple control, as well as to carry out the paths completely (freely / arbitrarily) if necessary. These versatile operations can be controlled with only two working valves 4, 5.
Claims (4)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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FI955172A FI955172A0 (en) | 1995-10-30 | 1995-10-30 | Foerfarande i ett tryckmediumsystem och ett tryckmediumsystem |
PCT/FI1996/000559 WO1997016372A1 (en) | 1995-10-30 | 1996-10-22 | Method in a pressure medium system for employing and controlling a lifting boom unit particularly in connection with a work machine |
Publications (3)
Publication Number | Publication Date |
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SE9801290L SE9801290L (en) | 1998-04-15 |
SE9801290D0 SE9801290D0 (en) | 1998-04-15 |
SE525907C2 true SE525907C2 (en) | 2005-05-24 |
Family
ID=8544278
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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SE9801290A SE525907C2 (en) | 1995-10-30 | 1998-04-15 | Method of a system with a pressurized medium for use and control of a lifting device especially in association with a working machine |
Country Status (5)
Country | Link |
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CA (1) | CA2231498C (en) |
DE (1) | DE19681624B4 (en) |
FI (2) | FI955172A0 (en) |
SE (1) | SE525907C2 (en) |
WO (1) | WO1997016372A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
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FI111938B (en) * | 1999-07-06 | 2003-10-15 | Plustech Oy | Boom control system for off-road machine |
DE102006018706A1 (en) | 2006-04-21 | 2007-10-25 | Robert Bosch Gmbh | Hydraulic control arrangement |
DE102007029355A1 (en) | 2007-06-26 | 2009-01-02 | Robert Bosch Gmbh | Hydraulic control arrangement |
DE102007029358A1 (en) | 2007-06-26 | 2009-01-02 | Robert Bosch Gmbh | Method and hydraulic control arrangement for pressure medium supply at least one hydraulic consumer |
CN102605786B (en) * | 2012-04-09 | 2014-07-16 | 山河智能装备股份有限公司 | Pile pressing-in back stroke control system of static pile pressing-in machine and operation method of pile pressing-in back stroke control system |
DE102012023562B3 (en) * | 2012-12-01 | 2013-12-19 | Festo Ag & Co. Kg | Lifting device has control unit that is coupled for limiting the movement of movable wall portion, and primary and secondary chambers that are filled with an incompressible fluid from closed-force-feedback fluid system |
FI124684B (en) * | 2012-12-03 | 2014-12-15 | Ponsse Oyj | Crane |
CN108516467B (en) * | 2018-06-20 | 2019-10-25 | 徐州重型机械有限公司 | The hydraulic control system and hoisting machinery of hoisting machinery |
CN115231485A (en) * | 2022-07-18 | 2022-10-25 | 湖南星邦智能装备股份有限公司 | Leveling hydraulic control system and aerial work platform |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3884359A (en) * | 1968-11-27 | 1975-05-20 | Hopper Inc | Level luffing crane |
AT303647B (en) * | 1970-06-23 | 1972-12-11 | Boehler & Co Ag Geb | Drill support |
SE416538B (en) * | 1979-04-02 | 1981-01-19 | Hiab Foco Ab | DEVICE FOR HYDRAULIC CRANES |
JPS57195904A (en) * | 1981-05-26 | 1982-12-01 | Shimadzu Corp | Hydraulic cylinder system |
GB8404005D0 (en) * | 1984-02-15 | 1984-03-21 | Boart Int Ltd | Drilling boom |
SE454351B (en) * | 1986-09-01 | 1988-04-25 | Osa Ab | DEVICE FOR LEVELING A TOOL FITTING TO A WEEKLY CRANE |
DE4009163A1 (en) * | 1990-03-02 | 1991-09-05 | Schwing Gmbh F | EXCAVATORS WITH AUTOMATIC PARALLEL POSITIONING HIS HAND-CONTROLLABLE WORK TOOL AND ARM SYSTEM THROUGH SENSORS |
FI90584C (en) * | 1991-04-10 | 1994-02-25 | Seppo Ensio Nisula | Method and apparatus for conducting a pressure medium to actuators |
-
1995
- 1995-10-30 FI FI955172A patent/FI955172A0/en not_active Application Discontinuation
-
1996
- 1996-10-22 CA CA002231498A patent/CA2231498C/en not_active Expired - Fee Related
- 1996-10-22 DE DE19681624T patent/DE19681624B4/en not_active Revoked
- 1996-10-22 WO PCT/FI1996/000559 patent/WO1997016372A1/en active Application Filing
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1998
- 1998-03-12 FI FI980558A patent/FI122922B/en not_active IP Right Cessation
- 1998-04-15 SE SE9801290A patent/SE525907C2/en unknown
Also Published As
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DE19681624B4 (en) | 2007-10-04 |
FI980558A0 (en) | 1998-03-12 |
WO1997016372A1 (en) | 1997-05-09 |
SE9801290L (en) | 1998-04-15 |
DE19681624T1 (en) | 1998-12-10 |
FI955172A0 (en) | 1995-10-30 |
FI122922B (en) | 2012-08-31 |
CA2231498C (en) | 2005-12-13 |
CA2231498A1 (en) | 1997-05-09 |
SE9801290D0 (en) | 1998-04-15 |
FI980558A (en) | 1998-03-12 |
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