SU1445986A2 - System for controlling pump-accumulator station of hydraulic presses - Google Patents

Abstract

The invention relates to the field of mechanical engineering, namely to control systems of pump-accumulator stations of presses. The purpose of the invention is to increase efficiency. In the control system, there is a setpoint for the minimum pump capacity and flow meters installed on the pressure lines of the pumps, electrically 1 connected to the input of the microprocessor controlling the operation of the pump-accumulator station. This allows the station to include the optimal number of pumps, depending on their actual capacity and average fluid consumption by the presses, 1 sludge.

Description

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The invention relates to mechanical engineering, namely to control systems of pump and accumulator stations, hydraulic presses, and is an improvement of the invention according to the author. St. 1283117,

The purpose of the invention is to increase the efficiency i by automatically turning on the optimal number of pumps, depending on their actual performance.

The drawing shows a schematic diagram of a pump-accumulator station control.

Control system of the pump-accumulator station of hydraulic presses; contains accumulator 1, connected by a pressure line through valve 2 minimum with pumps 3 by pumping liquid to presses 4 and equipped with unloading valves 5 and electric drives 6, flow meter 7 installed in the main line between pumps 3 and presses 4, sensors 8 controlling the level of fluid installed on the accumulator 1, the setting devices 9 of the fluid flow rate installed on the presses 4, the microprocessor 10, the inputs of which are connected to the sensors 8, the setting devices 9 and the flow meter 7, and the outputs - with the valve 2 minimum level, c times ruzochnot valves 5 and 6 electric pump 3, the sensor 11 za- minimum capacity of the pumps 3 and 12 ravhodome set forth flowline each pump 3. Outputs zadat- snip flowmeters 11 and 12 are connected to inputs of the microprocessor 10.

The control system operates as follows.

The setpoint 9 of each press 4 sets the average fluid flow rate. Information from setters 9 enters microprocessor 10, where the number of pumps 3 is summed up and calculated to ensure the required flow rate.

When the station is turned on, the microprocessor 10, according to the control algorithm, drives the minimum valve 2 and the electric actuators 6 and the discharge valves 5 of the required number of pumps. 3. When the unit is loaded, the valve 2 opens.

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at a minimum level, the hydraulic cylinder of the accumulator 1 is connected to the pressure line which feeds the presses 4. If the presses 4 do not consume liquid or consume it less than the total capacity of the pumps 3 that are loaded, the excess liquid is pumped into the accumulator 1 to the upper operating level, after which, according to the signal from sensor 8, microprocessor 10 turns off discharge valves 5, in the process of switching on the estimated number of pumps 3 into operation, flow meters 12 measure their actual performance, and flow meters 12 is supplied to the microprocessor 10 where it is summed and compared with a value equal to the sum sredpesekundnyh intakes fluid presses. In order to ensure non-stop operation of i presses, it is necessary to fulfill the condition whereby the total pump capacity of the pumps is equal to or greater than the average fluid consumption of the presses, and if this condition is not fulfilled, the additional number of pumps 3 is simultaneously compared. performance set on the setting device 11. In case the actual performance of the pump 3 is less than the minimum flaxally permissible, at the command of microprocessor 10, commands are received to shut off the loading valves 5 and electric drives 6 of pump 3, which has a capacity lower than the minimum permissible, and instead of the pump that is turned off, a backup pump is turned on.

Upon further liquid extraction by presses 4. the fluid level in accumulator 1 is lowered and, according to the signal from sensors 8, microprocessor 10 turns on unloading valves 5, pumps 3 begin to inject fluid into the pressure line to presses 4.

Flow meter 7 measures the current consumption of liquidity by presses 4 and its information enters microprocessor 10, where it is summed up over a conditional system operation cycle.

Then, the consumption value is compared in the microprocessor 10 with the total actual capacity of the pumps 3 involved in the operation and the additional number of pumps to be included in the work or excluded from the load is calculated.

If there is a shortage of fluid in battery 1, a signal is sent from sensor 8 through microprocessor 10 to close minimum valve 2, a command to unload relief valves 5 is confirmed, and a signal is sent to presses to stop liquid extraction by presses. After filling the aktschul torto 1 with liquid to the upper working level, the normal operation of the pumping and accumulator station is restored.

The economic effect of the implementation is achieved by increasing efficiency.

Claims (1)

Invention Formula Control system of pump-accumulator station of hydraulic presses according to author. St. 9 1283117, characterized in that, in order to increase efficiency by automatically turning on the optimal number of pumps depending on their actual performance, it is equipped with additional flow meters installed on the pressure lines of the pumps with an electric output and setpoint of the minimum pump performance, This electrical outputs of the additional flow meters and the setpoint of the minimum performance of the pumps are connected to the microprocessor. gp