CN211819876U - Sequence control loop for servo motor driven constant delivery pump - Google Patents
Sequence control loop for servo motor driven constant delivery pump Download PDFInfo
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- CN211819876U CN211819876U CN202020308764.8U CN202020308764U CN211819876U CN 211819876 U CN211819876 U CN 211819876U CN 202020308764 U CN202020308764 U CN 202020308764U CN 211819876 U CN211819876 U CN 211819876U
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Abstract
A sequential control loop for a servo motor driven fixed displacement pump, characterized by: the oil-return device comprises an oil outlet pipeline, an oil return pipeline and a duplex pump driven by a servo motor, wherein the duplex pump comprises a first constant delivery pump and a second constant delivery pump which are coaxially arranged, the oil outlet of the first constant delivery pump is communicated with the oil outlet pipeline, and the oil outlet of the second constant delivery pump is communicated with the oil outlet pipeline through a branch; the branch is provided with a reversing valve with an oil inlet, a first working port and an oil return port, the oil inlet of the reversing valve is communicated with the oil outlet of the second constant displacement pump, the first working port of the reversing valve is communicated with the oil outlet pipeline, the oil return port of the reversing valve is communicated with the oil return pipeline, the oil inlet of the reversing valve is communicated with the first working port when the oil pressure of the oil outlet pipeline is lower than a set pressure, and the oil inlet and the oil return port of the reversing valve are communicated when the oil pressure of the oil outlet pipeline reaches the set pressure. The utility model relates to a sequence control return circuit for servo motor drive constant delivery pump, more energy-conserving and can reduce hydraulic system's calorific capacity.
Description
Technical Field
The utility model belongs to the technical field of the driving system technique and specifically relates to a sequence control return circuit for servo motor drive constant delivery pump is related to.
Background
The hydraulic transmission system of rolling mill includes 5 portions of power element, actuator, control element, auxiliary element (attachment) and working medium, the power element can be used for converting mechanical energy of power machine into pressure energy of working medium, the control element can be used for controlling pressure, flow rate and flow direction of working medium and transferring the pressure energy of working medium to actuator, and the actuator can be used for converting the pressure energy of working medium into mechanical energy, outputting force and speed (i.e. linear movement) or torque and rotating speed (i.e. rotary movement). Wherein, the power element and the power machine jointly form a power source of a hydraulic transmission system of the rolling mill.
At present, in order to meet the control requirements of the output flow and pressure of a power source, the power source of a hydraulic transmission system of a rolling mill mainly comprises the following two modes:
the first one is variable pump power source, which provides one rotation power of fixed rotation speed via three-phase asynchronous motor to make the variable pump set in the flow rate value set in the upper computer, and has the oil pump with the actual displacement regulated by the displacement proportional valve and the proportional pressure valve to regulate the pressure required by the executing element. When the actuating element actuating pressure is larger than a set value, oil discharged by the oil pump flows back to the oil tank through the proportional pressure valve.
The second is a servo power source, mainly adopts a servo driver to control a servo synchronous motor to output different rotating speeds so as to drive a constant delivery pump to output different flows, and carries out closed-loop control on the rotating motion of the motor through a rotating speed encoder so as to stabilize the flow output by the constant delivery pump during the same action in each period, and also carries out closed-loop control on the torque of the rotating motion of the motor through a pressure sensor so as to stabilize the pressure of the same action in each period. The overflow valve plays a safety protection role in the system. The servo power system can provide more accurate pressure and flow according to the action requirements, does not generate redundant flow loss, is more energy-saving than the first variable pump system, and is widely applied.
Generally, when an actuating element of a hydraulic transmission system of a rolling mill is started, a large flow is needed, the requirement is low under normal working conditions, and due to the fact that the hydraulic transmission system has certain internal leakage, in order to keep the pressure of the hydraulic system stable, no matter which power source is used, a single pump runs in a high-pressure and low-flow state under the normal working conditions, redundant hydraulic oil flows back to an oil tank through an overflow valve, a large amount of power loss is caused, energy conversion efficiency is low, the lost power is converted into heat, the temperature of the hydraulic transmission system is increased, the service life of the hydraulic system is shortened, and therefore the power source still needs to be further improved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a sequence control return circuit for servo motor drive constant delivery pump is provided to foretell technical current situation, more energy-conserving and can reduce hydraulic transmission system's calorific capacity.
The utility model provides a technical scheme that foretell technical problem adopted does: a sequential control loop for a servo motor driven fixed displacement pump, characterized by: the oil return device comprises an oil outlet pipeline, an oil return pipeline and a dual pump driven by a servo motor, wherein the dual pump comprises a first constant delivery pump and a second constant delivery pump which are coaxially arranged, the oil outlet of the first constant delivery pump is communicated with the oil outlet pipeline, and the oil outlet of the second constant delivery pump is communicated with the oil outlet pipeline through a branch;
the oil pressure of the oil outlet pipeline is lower than the set pressure, the oil inlet and the first working port of the reversing valve are communicated, the oil pressure of the oil outlet pipeline reaches the set pressure, and the oil inlet and the oil return port of the reversing valve are communicated.
In a hydraulic station of a rolling mill, an actuating element is mainly a pressing oil cylinder, and the difference value between the large flow required when the actuating element is started and the small flow required when the actuating element is in a normal working condition is not large, so that the first constant displacement pump is a large-flow low-pressure pump, and the second constant displacement pump is a small-flow high-pressure pump in order to better adapt to the power requirement of the actuating element of the rolling mill. Under normal operating mode, this power supply still continues the fuel feeding through large-traffic low-pressure pump, makes the actuating element that the power supply can support move the more kind, and this power supply application scope is wider.
In order to control the reversing of the reversing valve conveniently, the reversing valve further comprises an oil unloading pipeline and a sequence valve used for controlling the reversing valve to change the flowing state of hydraulic oil in the reversing valve, the sequence valve is provided with an oil inlet and an oil outlet, the oil inlet of the sequence valve is communicated with the oil outlet pipeline, and the opening pressure of the sequence valve is the set pressure; the reversing valve is a hydraulic reversing valve with a control port, one path of the control port of the hydraulic reversing valve is communicated with an oil outlet of the sequence valve, and the other path of the control port of the hydraulic reversing valve is communicated with the oil discharge pipeline.
When the oil pressure of the oil outlet pipeline is lower than the opening pressure of the sequence valve, the valve port of the sequence valve is closed, the oil inlet and the oil outlet of the hydraulic reversing valve are communicated, and the second constant delivery pump and the first constant delivery pump supply oil simultaneously; when the oil pressure of the oil outlet pipeline rises to the opening pressure of the sequence valve, the valve port of the sequence valve is opened, the oil at the control port of the hydraulic reversing valve enters oil to enable the oil inlet and the oil return port of the hydraulic reversing valve to be communicated, the second constant delivery pump unloads the oil, and only the first constant delivery pump supplies the oil; when the oil pressure of the oil outlet pipeline is reduced to the opening pressure of the sequence valve due to the working conditions of large-flow action and the like, the valve port of the sequence valve is closed again, the control port of the hydraulic reversing valve does not feed oil any more, and the residual oil flows into the oil unloading pipeline through the control port of the hydraulic reversing valve, so that the hydraulic reversing valve is reset, the oil inlet and the oil outlet of the hydraulic reversing valve are communicated again, and the second constant delivery pump and the first constant delivery pump feed oil again at the same time.
The hydraulic reversing valve is controlled to reverse through the sequence valve, and compared with an electromagnetic reversing valve which needs to be controlled by combining an external controller, the hydraulic control mode of the reversing valve not only can realize self-control, so that control signal transmission is more reliable, and errors are not easy to occur in operation; moreover, hydraulic oil flowing out of the low-flow high-pressure pump can generate large impact when the reversing valve is reversed, and the hydraulic control mode can delay the impact, so that the control system can run more stably.
In order to delay the reset action of the hydraulic reversing valve, a damper used for adjusting the reset time of the hydraulic reversing valve is arranged between the control port of the hydraulic reversing valve and the oil unloading pipeline or on the oil unloading pipeline. The setting of attenuator can play the effect of protection control circuit and switching-over valve.
In order to accelerate unloading of the second fixed displacement pump, the reversing valve is further provided with a second working port communicated with the oil return pipeline, and an oil inlet of the reversing valve is communicated with the second working port when the oil pressure of the oil outlet pipeline reaches a set pressure. And when the oil pressure of the oil outlet pipeline reaches the set pressure, the hydraulic oil flowing out of the oil outlet of the second constant delivery pump is unloaded through the second working port and the oil return port of the reversing valve at the same time, so that the unloading is quicker.
In order to enable hydraulic oil flowing out of the second working port of the reversing valve to quickly enter the oil return pipeline, a first one-way valve is arranged between the second working port of the reversing valve and the oil return pipeline, an inlet of the first one-way valve is communicated with the second working port of the reversing valve, and an outlet of the first one-way valve is communicated with the oil return pipeline.
In order to enable hydraulic oil of the dual pump to rapidly enter the oil outlet pipeline, a second one-way valve is arranged on the oil outlet pipeline, a third one-way valve located behind the reversing valve is arranged on the branch, an inlet of the third one-way valve is communicated with a first working port of the reversing valve, and an outlet of the third one-way valve and an oil outlet of the first dosing pump are communicated with an inlet of the second one-way valve. Therefore, the hydraulic oil flowing out of the second fixed displacement pump flows out of the third one-way valve and is merged with the hydraulic oil flowing out of the first fixed displacement pump to enter the second one-way valve.
In order to protect the control loop, the control loop further comprises a first overflow valve with an oil inlet and an oil outlet, the oil inlet of the first overflow valve is communicated with the oil outlet pipeline, and the oil outlet of the first overflow valve is communicated with the oil return pipeline.
Similarly, in order to protect the control circuit, the control circuit also comprises a second overflow valve with an oil inlet and an oil outlet, wherein the oil inlet of the second overflow valve is communicated with the branch, and the oil outlet of the second overflow valve is communicated with the oil return pipeline.
In order to detect the pressure of hydraulic oil, be equipped with first manometer on the oil outlet pipeline, be equipped with the second manometer on the branch road.
Compared with the prior art, the utility model has the advantages of: the double pump driven by the servo motor is used as a power source of a hydraulic transmission system of the rolling mill, when an execution element is started, the first constant delivery pump and the second constant delivery pump are combined to supply oil, the servo motor operates at a high rotating speed to meet the large flow required when the execution element is started, and when the normal working condition is met, the reversing valve responds to the oil pressure of an oil outlet pipeline to reverse, so that the second constant delivery pump is unloaded, only the first constant delivery pump supplies oil, and the servo motor operates at a low rotating speed to meet the small flow required when the execution element normally operates, so that the power loss can be effectively reduced, the energy conversion efficiency can be improved, the heat productivity of the hydraulic system can be reduced, and the service life of the hydraulic system can; the first constant delivery pump is a high-flow low-pressure pump, the second constant delivery pump is a low-flow high-pressure pump, and the power source can still supply oil to the high-flow low-pressure pump under normal working conditions, so that the power source can better adapt to the power requirement of an executing element of a rolling mill, the types of actions of the executing element which can be supported by the power source are more, and the application range of the power source is wider; compared with an electromagnetic reversing valve which needs to be used in combination with a control element, the hydraulic reversing valve is controlled to reverse through the sequence valve, so that self-control can be realized, control signal transmission is more reliable, errors are not easy to occur in operation, impact generated when hydraulic oil flowing out of the low-flow high-pressure pump reverses in the reversing valve can be delayed, and the operation of a control system is more stable.
Drawings
Fig. 1 is a schematic connection diagram of a sequence control loop for a servo motor driven fixed displacement pump according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
As shown in fig. 1, the sequence control circuit for a servo motor driven fixed displacement pump according to the present embodiment includes a servo motor 1, a dual pump, an oil outlet pipe 31, an oil return pipe 32, an oil discharge pipe 33, a branch pipe 34, a reversing valve 4, a sequence valve 5, a damper 6, a first check valve 71, a second check valve 72, a third check valve 73, a first overflow valve 81, a second overflow valve 82, a first pressure gauge 91, and a second pressure gauge 92.
As shown in fig. 1, the tandem pump is driven by a servo motor 1. The double pump comprises a first fixed displacement pump 11 and a second fixed displacement pump 12 which are coaxially arranged, the oil outlet of the first fixed displacement pump 11 is communicated with the oil outlet pipeline 31, and the oil outlet of the second fixed displacement pump 12 is communicated with the oil outlet pipeline 31 through a branch 34. The branch 34 is provided with a reversing valve 4 having an oil inlet, a first working port and an oil return port, the oil inlet of the reversing valve 4 is communicated with the oil outlet of the second fixed displacement pump 12, the first working port of the reversing valve 4 is communicated with the oil outlet pipeline 31, and the oil return port of the reversing valve 4 is communicated with the oil return pipeline 32. The direction change valve 4 changes the flow direction of the oil in the direction change valve 4 in response to the oil pressure in the oil outlet line 31. Specifically, the oil inlet of the reversing valve 4 is communicated with the first working port in a state that the oil pressure of the oil outlet pipeline 31 is lower than a set pressure; when the oil pressure of the oil outlet pipeline 31 reaches the set pressure, the oil inlet and the oil return port of the reversing valve 4 are communicated.
In the sequential control loop for the servo motor to drive the fixed displacement pumps in the embodiment, the servo motor 1 drives the dual pump to serve as a power source, the first fixed displacement pump 11 and the second fixed displacement pump 12 are combined to supply oil when the execution element is started, the servo motor 1 operates at a high rotating speed to meet the large flow required when the execution element is started, and the reversing valve 4 responds to the oil pressure of the oil outlet pipeline 31 to reverse under normal working conditions, so that the second fixed displacement pump 12 is unloaded, only the first fixed displacement pump 11 supplies oil, and the servo motor 1 operates at a low rotating speed to meet the small flow required when the execution element normally operates, so that power loss can be effectively reduced, the energy conversion efficiency is improved, compared with the prior art, the sequential control loop is more energy-saving in power source, the heat productivity of a hydraulic system can be reduced, and the service life of the hydraulic system.
In a hydraulic station of a rolling mill, an actuating element is mainly a pressing oil cylinder, and the difference value between the large flow required when the actuating element is started and the small flow required when the actuating element is in a normal working condition is not large, so that the first constant displacement pump 11 is a large-flow low-pressure pump, and the second constant displacement pump 12 is a small-flow high-pressure pump in order to better adapt to the power requirement of the actuating element of the rolling mill. The power source continuously supplies oil through the high-flow low-pressure pump under normal working conditions, so that the actuating elements which can be supported by the power source are more in action types, and the power source is wider in application range.
As shown in fig. 1, in order to accelerate unloading of the second fixed displacement pump 12, the selector valve 4 further has a second working port communicating with the oil return line 32, and the oil inlet of the selector valve 4 is also communicated with the second working port in a state where the oil pressure of the oil outlet line 31 reaches a set pressure. A first one-way valve 71 is arranged between the second working port of the reversing valve 4 and the oil return pipeline 32, an inlet of the first one-way valve 71 is communicated with the second working port of the reversing valve 4, and an outlet of the first one-way valve 71 is communicated with the oil return pipeline 32.
As shown in fig. 1, the sequence valve 5 is used to control the change valve 4 to change the flow direction of the hydraulic oil therein in response to the oil pressure of the oil outlet line 31. The sequence valve 5 is provided with an oil inlet and an oil outlet, wherein the oil inlet of the sequence valve 5 is communicated with the oil outlet pipeline 31, and the opening pressure of the sequence valve 5 is the set pressure; the reversing valve 4 is a hydraulic reversing valve with a control port, one path of the control port of the hydraulic reversing valve is communicated with the oil outlet of the sequence valve 5, and the other path of the control port of the hydraulic reversing valve is communicated with the oil discharge pipeline 33. In the embodiment, the sequence valve 5 is used for controlling the hydraulic reversing valve to reverse, and compared with an electromagnetic reversing valve which needs to be used in combination with a control element, the hydraulic reversing valve not only can realize self-control and ensure that control signal transmission is more reliable, and operation is not easy to make mistakes, but also can delay impact generated when hydraulic oil flowing out of a low-flow high-pressure pump reverses in the reversing valve, so that a control system can operate more stably.
As shown in fig. 1, in order to delay the reset action of the hydraulic directional control valve, a damper 6 for adjusting the reset time of the hydraulic directional control valve is arranged on the oil discharge line 33. The damper 6 is provided to protect the control circuit and the selector valve 4.
As shown in fig. 1, in order to enable the hydraulic oil of the tandem pump to rapidly enter the oil outlet pipeline 31, a second check valve 72 is arranged on the oil outlet pipeline 31, and a third check valve 73 positioned behind the reversing valve 4 is arranged on the branch pipeline 34. In this embodiment, an inlet of the third check valve 73 is communicated with the first working port of the reversing valve 4, an outlet of the third check valve 73 and an oil outlet of the first metering pump 11 are both communicated with an inlet of the second check valve 72, so that the hydraulic oil flowing out of the second metering pump 12 flows out through the third check valve 73, is merged with the hydraulic oil flowing out of the first metering pump 11, and then enters the second check valve 72.
As shown in fig. 1, in order to protect the control circuit, a first relief valve 81 and a second relief valve 82 are further included, and each of the first relief valve 81 and the second relief valve 82 has an oil inlet and an oil outlet. The oil inlet of the first relief valve 81 is communicated with the oil outlet line 31, and the oil outlet of the first relief valve 81 is communicated with the oil return line 32, so that the first relief valve 81 functions as a relief valve for adjusting the oil pressure of the oil outlet line 31. The oil inlet of the second overflow valve 81 is communicated with the branch 34, and the oil outlet of the second overflow valve 82 is communicated with the oil return line 32, so that the second overflow valve 82 serves as a safety valve for setting the oil pressure of the branch 34.
As shown in fig. 1, in order to detect the pressure of the hydraulic oil, a first pressure gauge 91 is disposed on the oil outlet pipe 31, and a second pressure gauge 92 is disposed on the branch pipe 34.
As shown in fig. 1, the operation principle of the sequential control loop for the servo motor to drive the fixed displacement pump in the present embodiment is as follows:
when the oil pressure of the oil outlet pipeline 31 is lower than the opening pressure of the sequence valve 5, the valve port of the sequence valve 5 is closed, the oil inlet and the oil outlet of the hydraulic reversing valve are communicated, the second fixed displacement pump 12 and the first fixed displacement pump 11 supply oil simultaneously, and the servo motor 1 runs at a high rotating speed to meet the large flow required when the execution element is started; when the oil pressure of the oil outlet pipeline 31 rises to the opening pressure of the sequence valve 5, the valve port of the sequence valve 5 is opened, the oil inlet of the control port of the hydraulic reversing valve enables the oil inlet and the oil return port of the hydraulic reversing valve to be communicated, the second constant displacement pump 12 is unloaded, only the first constant displacement pump 11 supplies oil, the servo motor 1 runs at a low rotating speed to meet the small flow required by the normal operation of an executing element, the pressure of the oil outlet pipeline 31 continuously rises until the set pressure of the first overflow valve 81, and in the process, the sequence valve 5 keeps the valve port open state and the hydraulic reversing valve keeps the reversing state; when the oil pressure of the oil outlet pipeline 31 is reduced to the opening pressure of the sequence valve 5 due to the working conditions of large flow action and the like, the valve port of the sequence valve 5 is closed again, the control port of the hydraulic reversing valve does not feed oil any more, and the residual oil flows into the oil unloading pipeline 33 through the control port of the hydraulic reversing valve, so that the hydraulic reversing valve is reset, the oil inlet and the oil outlet of the hydraulic reversing valve are conducted again, and the second fixed displacement pump 12 and the first fixed displacement pump 11 supply oil again at the same time.
Claims (10)
1. A sequential control loop for a servo motor driven fixed displacement pump, characterized by: the oil return device comprises an oil outlet pipeline (31), an oil return pipeline (32) and a dual pump driven by a servo motor (2), wherein the dual pump comprises a first quantitative pump (11) and a second quantitative pump (12) which are coaxially arranged, the oil outlet of the first quantitative pump (11) is communicated with the oil outlet pipeline (31), and the oil outlet of the second quantitative pump (12) is communicated with the oil outlet pipeline (31) through a branch (34);
be equipped with reversing valve (4) that have oil inlet, first working opening and oil return opening on branch road (34), the oil inlet of reversing valve (4) with the oil-out intercommunication of second constant displacement pump (12), the first working opening of reversing valve (4) with go out oil pipe way (31) intercommunication, the oil return opening of reversing valve (4) with oil return pipeline (32) intercommunication, the oil pressure of going out oil pipe way (31) is less than under the state of set pressure, the oil inlet and the first working opening of reversing valve (4) switch on, the oil pressure of going out oil pipe way (31) reaches under the state of set pressure, the oil inlet and the oil return opening of reversing valve (4) switch on.
2. A sequential control loop for a servo motor driven fixed displacement pump according to claim 1, wherein: the first fixed displacement pump (11) is a high-flow low-pressure pump, and the second fixed displacement pump (12) is a low-flow high-pressure pump.
3. A sequential control loop for a servo motor driven fixed displacement pump according to any of claims 1-2, wherein: the hydraulic control system is characterized by further comprising an oil unloading pipeline (33) and a sequence valve (5) used for controlling the reversing valve (4) to change the flowing state of hydraulic oil in the reversing valve (4), wherein the sequence valve (5) is provided with an oil inlet and an oil outlet, the oil inlet of the sequence valve (5) is communicated with the oil outlet pipeline (31), and the opening pressure of the sequence valve (5) is the set pressure; the reversing valve (4) is a hydraulic reversing valve with a control port, one path of the control port of the hydraulic reversing valve is communicated with an oil outlet of the sequence valve (5), and the other path of the control port of the hydraulic reversing valve is communicated with the oil discharging pipeline (33).
4. A sequential control loop for a servo motor driven fixed displacement pump according to claim 3, wherein: and a damper (6) for adjusting the reset time of the hydraulic reversing valve is arranged between the control port of the hydraulic reversing valve and the oil unloading pipeline (33) or on the oil unloading pipeline (33).
5. A sequential control loop for a servo motor driven fixed displacement pump according to claim 1, wherein: the reversing valve (4) is also provided with a second working port communicated with the oil return pipeline (32), and an oil inlet of the reversing valve (4) is also communicated with the second working port when the oil pressure of the oil outlet pipeline (31) reaches a set pressure.
6. A sequential control loop for a servo motor driven fixed displacement pump according to claim 5, wherein: a first one-way valve (71) is arranged between a second working port of the reversing valve (4) and the oil return pipeline (32), an inlet of the first one-way valve (71) is communicated with the second working port of the reversing valve (4), and an outlet of the first one-way valve (71) is communicated with the oil return pipeline (32).
7. A sequential control loop for a servo motor driven fixed displacement pump according to claim 1 or 2 or 4 or 5 or 6, wherein: the oil outlet pipeline (31) is provided with a second one-way valve (72), the branch (34) is provided with a third one-way valve (73) located behind the reversing valve (4), an inlet of the third one-way valve (73) is communicated with a first working port of the reversing valve (4), and an outlet of the third one-way valve (73) and an oil outlet of the first dosing pump (11) are communicated with an inlet of the second one-way valve (72).
8. A sequential control loop for a servo motor driven fixed displacement pump according to claim 1 or 2 or 4 or 5 or 6, wherein: the oil return device is characterized by further comprising a first overflow valve (81) with an oil inlet and an oil outlet, the oil inlet of the first overflow valve (81) is communicated with the oil outlet pipeline (31), and the oil outlet of the first overflow valve (81) is communicated with the oil return pipeline (32).
9. A sequential control loop for a servo motor driven fixed displacement pump according to claim 8, wherein: the oil return device is characterized by further comprising a second overflow valve (82) with an oil inlet and an oil outlet, the oil inlet of the second overflow valve (82) is communicated with the branch circuit (34), and the oil outlet of the second overflow valve (82) is communicated with the oil return pipeline (32).
10. A sequential control loop for a servo motor driven fixed displacement pump according to claim 1 or 2 or 4 or 5 or 6, wherein: and a first pressure gauge (91) is arranged on the oil outlet pipeline (31), and a second pressure gauge (92) is arranged on the branch (34).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020308764.8U CN211819876U (en) | 2020-03-12 | 2020-03-12 | Sequence control loop for servo motor driven constant delivery pump |
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| CN202020308764.8U CN211819876U (en) | 2020-03-12 | 2020-03-12 | Sequence control loop for servo motor driven constant delivery pump |
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| CN211819876U true CN211819876U (en) | 2020-10-30 |
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| CN202020308764.8U Active CN211819876U (en) | 2020-03-12 | 2020-03-12 | Sequence control loop for servo motor driven constant delivery pump |
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