EP0027743B1 - Regelungssystem für eine Hydraulikanlage mit einer Mehrzahl paralleler Pumpen veränderlichen Förderstromes - Google Patents
Regelungssystem für eine Hydraulikanlage mit einer Mehrzahl paralleler Pumpen veränderlichen Förderstromes Download PDFInfo
- Publication number
- EP0027743B1 EP0027743B1 EP19800303741 EP80303741A EP0027743B1 EP 0027743 B1 EP0027743 B1 EP 0027743B1 EP 19800303741 EP19800303741 EP 19800303741 EP 80303741 A EP80303741 A EP 80303741A EP 0027743 B1 EP0027743 B1 EP 0027743B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pumps
- delivery
- pump
- control system
- maximum
- 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
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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
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
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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
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
- F15B2211/20553—Type of pump variable capacity with pilot circuit, e.g. for controlling a swash plate
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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
- F15B2211/30—Directional control
- F15B2211/305—Directional control characterised by the type of valves
- F15B2211/30505—Non-return valves, i.e. check 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
- F15B2211/30—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
- F15B2211/30575—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 in a Wheatstone Bridge arrangement (also half bridges)
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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
- F15B2211/30—Directional control
- F15B2211/32—Directional control characterised by the type of actuation
- F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
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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
- F15B2211/30—Directional control
- F15B2211/32—Directional control characterised by the type of actuation
- F15B2211/329—Directional control characterised by the type of actuation actuated by fluid pressure
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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
- F15B2211/50—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
- F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief 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
- F15B2211/50—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
- F15B2211/50536—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using unloading valves controlling the supply pressure by diverting fluid to the return line
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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
- F15B2211/50—Pressure control
- F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
- F15B2211/5151—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a directional control valve
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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
- F15B2211/50—Pressure control
- F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
- F15B2211/5153—Pressure control characterised by the connections of the pressure control means in the circuit being connected to an output member and a directional control valve
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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
- F15B2211/50—Pressure control
- F15B2211/55—Pressure control for limiting a pressure up to a maximum pressure, e.g. by using a pressure relief valve
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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
- F15B2211/60—Circuit components or control therefor
- F15B2211/63—Electronic controllers
- F15B2211/6303—Electronic controllers using input signals
- F15B2211/6336—Electronic controllers using input signals representing a state of the output member, e.g. position, speed or acceleration
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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
- F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
- F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve 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
- F15B2211/60—Circuit components or control therefor
- F15B2211/665—Methods of control using electronic components
- F15B2211/6651—Control of the prime mover, e.g. control of the output torque or rotational speed
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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
- F15B2211/665—Methods of control using electronic components
- F15B2211/6653—Pressure control
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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
- F15B2211/7052—Single-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
- F15B2211/705—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
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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
- F15B2211/7107—Multiple output members, e.g. multiple hydraulic motors or cylinders the output members being mechanically linked
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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
- F15B2211/7128—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators the chambers being connected in parallel
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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
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/88—Control measures for saving energy
Definitions
- This invention relates to a control system for use in a hydraulic circuit supplying pressurized oil or fluid from a plurality of parallel connected variable delivery pumps to a hydraulic appliance.
- variable delivery pumps are used then it is conventional, when the amount of oil or fluid is less than the maximum which can be pumped by all of the pumps, to run all the pumps together but at the same fraction of their maximum output. Thus if, for example, only half of the maximum oil or fluid which can be pumped by all of the pumps is required, then each of the pumps will operate at half of its maximum output.
- the control for such a system is simple since all of the variable pumps can be controlled together.
- the present invention provides a control system for use in a hydraulic circuit including a plurality of parallel pumps; said control system comprising means for bringing a variable number of pumps into a loaded state dependent on the required volume of pressure fluid, characterised in that the pumps are variable delivery pumps and the control system controls the plurality of pumps so that when the required volume of pressure fluid does not exceed the maximum ⁇ oIume ⁇ deliverabIe from one pump, one only of said pumps is in a loaded state for delivering the required volume of pressure fluid and the other pumps are in an unloaded state, and when the required volume of pressure fluid exceeds the maximum volume deliverable from one or more pumps, one or more of said pumps are in their substantially maximum delivery state, one only of the other pumps is in an intermediate delivery state and the remaining pumps are in an unloaded state.
- the quantity of fluid delivered from each of the pumps is controlled by the control system dynamically and according to the demanded quantity required by the appliance which may be an extrusion press.
- the system ensures the pumps operate in an optimum manner to reduce energy losses and power consumption.
- Figure 1 shows a hydraulic circuit of an extrusion press, which comprises variable-delivery (11, 12, 13 and 14), pump driving motors (21, 22, 23 and 24), delivery regulators (31,32,33 and 34) one for each of the pumps, loading control valves (41, 42, 43 and 44) for loading and unloading the respective pumps, relief valves (45, 46, 47 and 48), direction switching solenoid valves (51,52,53,54, 55 and 56), a pilot controlled check valve (57), relief valves (58 and 59) an extrusion press (60) having a main cylinder (61), side cylinders (62 and 63) and a stem ⁇ (64), and pilot pumps (71 and 72). These hydraulic component parts are interconnected as shown in Figure 1.
- variable-delivery pumps 11, 12, 13 and 14
- the volume of pressure fluid e.g. oil
- the volume of pressure fluid e.g. oil
- programmed electric signals are fed from a control panel not shown to actuate one or more of the solenoid valves (51, 52, 53, 54, 55 and 56), thus establishing flow paths between the cylinders (61, 62 and 63) and the pumps or an oil reservoir and actuating the cylinders (61, 62 and 63) according to the control program.
- the operation speed of the stem (64), that is, the volume of oil supplied to each of the cylinders (61, 62 and 63) is controlled by switching on and off the loading control valves (41, 42, 43 and 44) which in turn govern the delivery of each of the respective pumps (11, 12, 13 and 14).
- the operation speed of the stem (64) (this is referred to as "extrusion speed” hereinafter) is monitored with a sensor (81) operatively associated with a stem speed setting (80) installed on the extrusion press (60).
- the function of the sensor is to detect the demanded extrusion speed in terms of percentage wherein rated maximum speed is denoted as 100%.
- the output of the sensor (81) is converted into an AC or DC signal and supplied to a controller (82) which in turn provides individual signals (C1, C2, C3 and C4) for the delivery regulators (31, 32, 33 and 34) and individual signals (C1', C2', C3' and C4') for the loading control solenoid valves (41, 42, 43 and 44 in response to a previously programmed extrusion start signal.
- a controller which in turn provides individual signals (C1, C2, C3 and C4) for the delivery regulators (31, 32, 33 and 34) and individual signals (C1', C2', C3' and C4') for the loading control solenoid valves (41, 42, 43 and 44 in response to a previously programmed extrusion start signal.
- the delivery regulators (31, 32, 33 and 34) are supplied with a given pilot pressure (Pa) from the pilot pump (71).
- the respective solenoid valves (41, 42, 43 and 44) are switched on and off to load and unload the respective pumps (11, 12, 13 and 14) according to the extrusion speed or the required volume of oil for each of the cylinders (61, 62 and 63) as seen from Figure 3.
- Figure 3 shows four vertical columns, the first vertical column between the lines 0 and 25 relating to the situation when the extrusion speed is between 0 and 25% of the rated specified maximum speed.
- the second column is indicated between 25 and 50 and similarly indicates the situation when the extrusion speed is rated between 25 and 50% of the specified maximum speed and similarly for the third and fourth columns between the 50 and 75 line and the 75 and 100 line.
- the state of load of each pump 11, 12,13 and 14 which is listed to the left of the first column is indicated by a hatched area.
- the hatched area indicates whether, in respect of pump 11, the electromagnetic valve 41 is on and with respect to pump 12 the electromagnetic valve 42 is on and with respect to pumps 13 and 14 whether the electromagnetic valves 43, 44 respectively are on.
- the solenoid valve 41 is energised (indicated by hatching in the first vertical column of Figure 3) to load only one pump (11) of which the inclination is varied by the delivery regulator (31) (as indicated by Figures 0% to 100% in first vertical column of Figure 4) in accordance with control signals C1 (as indicated in Figure 4) to control its delivery output within the range of 0 to 100%.
- the solenoid valves (41 and 42) are energised (indicated by hatching in the second vertical column of Figure 3) to load the two pumps (11 and 12).
- the delivery regulator (31) increases the inclination of one of the two pumps (11) to its maximum (100%) and the delivery of that pump (11) to its maximum (100%).
- the delivery regulator (32) controls the inclination of the other pump (12) and regulates its delivery within the range of 0-100% (as indicated in the second column of Figure 4 alongside pump (12)).
- the 100% delivery pump (11) combined with the other pump (12) which supplies the deficiency of oil, provides exactly the required volume of oil for actuation of the stem (64).
- the solenoid valves (43 and 44) are disenergised to unload the remaining pumps (13 and 14) and place the same into no-load state (indicated by no hatching in the second vertical column of Figure 3).
- the pumps (11, 12, 13 and 14) are loaded in the numerical order in this manner (the reverse of order with a decrease in oil requirement).
- One or more 100% delivery pumps and one supplemental pump under half-load state satisfy exactly the oil requirement, while the remaining pump or pumps are maintained under no-load state with no delivery.
- This control method ensures up to 40% power saving as compared with the conventional method wherein all of the pumps are loaded at one time.
- a particular pump is adapted to start inclining after 100% inclination of the preceding pump.
- the particular pump may start inclining subsequent to 95% inclination.ofthe preceding pump, for example, in order to provide smooth and continuous operation as a whole.
- the relationship between the extrusion speed and the inclination speed is controlled to be one half of that with only one pump.
- variable-delivery pump the volume efficiency and the overall efficiency vary in dependence on the inclination (a) or the delivery volume of oil delivered as shown in Figure 5 and 6.
- the characteristic of the variable-delivery pump is that its volume efficiency amount to maximum values when it operates with its rated maximum delivery (maximum inclination).
- the operation speed of the stem within the extrusion press is varied frequently and within a wide range so that the volume of oil supplied and the delivery of the pump are varied frequently and within a wide range.
- the respective pumps operate less frequently with its rated maximum speed (the required volume of oil is equal to the total of the maximum deliveries of the overall pumps).
- the present invention only a minimum number of the pumps are loaded depending upon oil requirement and the remaining pumps are unloaded, thus reducing power consumption. Moreover, only one of the loaded pumps is held in half-load state while all of the remaining pumps operate with full or 100% delivery. This leads to a substantial increase in the total efficiency of the pumps and remarkable energy-saving characteristics.
- the motor (24) is disenergized when the pump (11) is in 100% delivery state and the pump (12) is in half-load state.
- the motor (23) is disenergized when the delivery control signal (C3) for the pump (12) is less than 70% and energized when the same exceeds 70%.
- the pump (13) is maintained in no-load state.
- the line (a) depicts power saving when the extrusion speed is 25% of the rated value, while the line (b) power saving when the extrusion speed is 50% of the rated speed. It is clear from Figure 7, that the present invention ensures 20-40% power saving in the case of the line (a) and 8-18% power saving in the case of the line (b). The lower the extrusion pressure (remarkable especially with less than 50 kg/cm 2 ) and the extrusion speed, the greater the power saving effect.
- the present invention provides effective and power-saving actuation of the pumps.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Control Of Presses (AREA)
- Press Drives And Press Lines (AREA)
Claims (2)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13661879A JPS5659005A (en) | 1979-10-22 | 1979-10-22 | Controller for hydraulic circuit including plural variable-capacity pumps in parallel |
JP136618/79 | 1979-10-22 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0027743A1 EP0027743A1 (de) | 1981-04-29 |
EP0027743B1 true EP0027743B1 (de) | 1985-05-15 |
Family
ID=15179505
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19800303741 Expired EP0027743B1 (de) | 1979-10-22 | 1980-10-22 | Regelungssystem für eine Hydraulikanlage mit einer Mehrzahl paralleler Pumpen veränderlichen Förderstromes |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0027743B1 (de) |
JP (1) | JPS5659005A (de) |
DE (1) | DE3070650D1 (de) |
Families Citing this family (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5821505U (ja) * | 1981-08-04 | 1983-02-09 | 富士レビオ株式会社 | 瓶 |
JPS58174704A (ja) * | 1982-04-07 | 1983-10-13 | Uchida Yuatsu Kiki Kogyo Kk | 合流回路に於ける流量制御方法 |
JPS60208605A (ja) * | 1984-03-31 | 1985-10-21 | Ishikawajima Harima Heavy Ind Co Ltd | 船上甲板機械の制御装置 |
JPS60245806A (ja) * | 1984-05-18 | 1985-12-05 | Nissei Plastics Ind Co | 合流回路 |
JPS60245805A (ja) * | 1984-05-18 | 1985-12-05 | Nissei Plastics Ind Co | 合流回路 |
DE3614967C2 (de) * | 1986-05-02 | 1994-08-18 | Paals Packpressen Fabrik Gmbh | Ballenpresse |
JPS6353002U (de) * | 1986-09-24 | 1988-04-09 | ||
DE3901475C2 (de) * | 1989-01-19 | 1994-07-14 | Danfoss As | Fluidgesteuerte Servoanordnung |
JPH0752390Y2 (ja) * | 1989-11-27 | 1995-11-29 | 油研工業株式会社 | 油圧供給装置 |
US5128335A (en) * | 1990-10-15 | 1992-07-07 | Merck & Co., Inc. | 2-heteroarylphenyl-carbapenem antibacterial agents |
JP2580999Y2 (ja) * | 1990-10-30 | 1998-09-17 | 三菱重工業株式会社 | 液圧供給装置を有する射出成形機 |
US6004264A (en) | 1994-07-04 | 1999-12-21 | Asahi Kogaku Kogyo Kabushiki Kaisha | Portable endoscope system |
US6128900A (en) * | 1998-01-28 | 2000-10-10 | Case Corporation | Hydraulic fluid supply system |
AT411784B (de) * | 2000-05-03 | 2004-05-25 | Weber Walter | Steuervorrichtung für doppeltwirkende hydraulische arbeitszylinder |
JP2010164086A (ja) * | 2009-01-13 | 2010-07-29 | Isuzu Motors Ltd | マルチ推力合成プランジャ機構 |
JP2011224644A (ja) * | 2010-04-23 | 2011-11-10 | Ube Machinery Corporation Ltd | 押出プレス装置 |
JP5834517B2 (ja) * | 2011-06-15 | 2015-12-24 | 宇部興産機械株式会社 | 押出プレス |
JP5846483B2 (ja) * | 2011-10-25 | 2016-01-20 | 宇部興産機械株式会社 | 押出プレスの制御方法 |
DE102012009182A1 (de) * | 2012-05-10 | 2013-11-14 | Sms Meer Gmbh | Hydraulische Strangpresse sowie Verfahren zum Betrieb einer hydraulischen Strangpresse |
CN105143685B (zh) * | 2013-04-11 | 2017-04-26 | 日立建机株式会社 | 作业机械的驱动装置 |
JP5769859B1 (ja) * | 2014-11-03 | 2015-08-26 | 日本エアロフォージ株式会社 | 液圧鍛造プレス装置及びその制御方法 |
US10281709B2 (en) | 2015-10-28 | 2019-05-07 | Acera, Llc | Handheld mobile light source |
JP6704716B2 (ja) * | 2015-11-26 | 2020-06-03 | 株式会社モリタ環境テック | 切断処理装置及び切断処理装置の運転方法 |
EP3311997A1 (de) * | 2016-10-18 | 2018-04-25 | Automation, Press and Tooling, A.P. & T AB | Servohydraulische presse |
JP6834508B2 (ja) * | 2017-01-17 | 2021-02-24 | 宇部興産機械株式会社 | 押出プレスにおけるメインラムの押出速度制御方法および押出プレス |
CA3125671A1 (en) | 2019-01-02 | 2020-07-09 | Acera LLC | Positioning a tube in a lumen via transillumination |
JP7375603B2 (ja) * | 2020-02-20 | 2023-11-08 | Ubeマシナリー株式会社 | 押出プレス装置 |
CN111572083B (zh) * | 2020-04-17 | 2021-04-13 | 江苏国力锻压机床有限公司 | 一种玻璃钢制品液压机 |
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Publication number | Priority date | Publication date | Assignee | Title |
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US2947317A (en) * | 1953-06-12 | 1960-08-02 | Electraulic Presses Ltd | Unloading valves for hydraulic pumps |
US2811838A (en) * | 1954-06-15 | 1957-11-05 | American Steel Foundries | Hydraulic press circuit |
FR1410250A (fr) * | 1964-06-16 | 1965-09-10 | Compteurs Comp D | Dispositif de commande automatique d'une station de pompage |
US3744932A (en) * | 1971-04-30 | 1973-07-10 | Prevett Ass Inc | Automatic sequence control system for pump motors and the like |
JPS5091010A (de) * | 1973-12-17 | 1975-07-21 | ||
JPS526890A (en) * | 1975-07-07 | 1977-01-19 | Hitachi Ltd | Speed control device for an apparatus driven by oil pressure |
JPS5364241A (en) * | 1976-11-19 | 1978-06-08 | Denki Kagaku Kogyo Kk | Adhesive compositions |
JPS5432806U (de) * | 1977-08-08 | 1979-03-03 |
-
1979
- 1979-10-22 JP JP13661879A patent/JPS5659005A/ja active Granted
-
1980
- 1980-10-22 DE DE8080303741T patent/DE3070650D1/de not_active Expired
- 1980-10-22 EP EP19800303741 patent/EP0027743B1/de not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPH0258482B2 (de) | 1990-12-07 |
DE3070650D1 (en) | 1985-06-20 |
JPS5659005A (en) | 1981-05-22 |
EP0027743A1 (de) | 1981-04-29 |
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