CN203281784U - Flow control system of forging hydraulic press - Google Patents
Flow control system of forging hydraulic press Download PDFInfo
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- CN203281784U CN203281784U CN2013202879245U CN201320287924U CN203281784U CN 203281784 U CN203281784 U CN 203281784U CN 2013202879245 U CN2013202879245 U CN 2013202879245U CN 201320287924 U CN201320287924 U CN 201320287924U CN 203281784 U CN203281784 U CN 203281784U
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Abstract
The utility model discloses a flow control system of a forging hydraulic press. The flow control system comprises no less than one double-pump. Each double-pump comprises a high-power constant delivery pump and a small-power pump, wherein the rated output flow of the high-power constant delivery pump is twice that of the small-power pump, the small-power pump internally comprises at least one proportional variable pump, and therefore, the flow control system can meet the requirement of the hydraulic press on the rapid increasing of oil supply, and simultaneously can be used for reducing the impact of the output flow on a hydraulic press pipeline during operation. As the rated output flow of each high-power constant delivery pump is twice that of the corresponding small-power pump, the output flow preset by the system can be controlled through the matching between different quantities of high-power constant delivery pumps and small-power pumps, and a dead zone, which the output flow cannot reach, does not exist. In addition, the flow control system also comprises the proportional variable pump and can be used for realizing the infinitely variable control of output flow.
Description
Technical field
The utility model relates to a kind of control system that is applied to pump group flow; Particularly, be a kind of hydraulic forging press that is applied to the many duplex pumps of large flow, the system of carrying out flow-control.
Background technology
Develop rapidly along with the rolling metal industry, tonnage demand for hydraulic press is also more and more higher, be directed to especially the high speed forging hydraulic press that requires operating rate high, be directed to large flow large-tonnage hydraulic pressure pump group flow control system and corresponding flow control methods arises at the historic moment.
the general control system that includes the high-power proportional variable pump of many groups that adopts of existing hydraulic forging press is controlled the output flow of hydraulic press, the technical scheme that this control system adopts for the control of output flow is: because high-power proportional variable pump has advantages of, can regulate according to user's demand percentage the output flow of pump, therefore can and regulate a plurality of rate variable pump startups, to realize the step-less adjustment of output flow, alleviated the impact of large flowed fluctuation to system pipeline, and can realize the step-less adjustment of flow, the control accuracy of such control system is higher, be applicable to the industry that has higher requirements for control accuracy.
Yet there is following defect in this control system:
(1) high-power proportional variable pump is when improving output flow, and dynamic response contrast is slow, is difficult to meet the working condition requirement that improves fast output flow in the hydraulic forging press short time.
(2) cost of the design of high-power proportional variable pump and debugging is high: high-power proportional variable pump is because manufacture process requirement is high, the use field is relatively narrow and small, the general imported product that all concentrates on several foreign brand names, proportional variable pump need to shift to an earlier date a very long time and order carrying out hydraulic press when design, and be difficult to determine the time of advent of this high-power proportional variable pump,, if can't reach on time, will affect hydraulic press in the installation and debugging progress; In addition, high-power proportional variable pump and the swash plate device that matches thereof and proportioning valve are in the process of installation and debugging, and every proportional variable pump all needs to carry out the debugging of performance graph, this debugging needs veteran staff to specialize in, the length that expends time in, efficiency is low, and cost is high.
(3) use cost of high-power proportional variable pump is high: high-power proportional variable pump is with respect to the more simple high-power constant displacement pump of structure, be not easy to safeguard in daily production and application process, be not easy maintenance if there is fault, the use cost in later stage is higher.
The utility model content
The purpose of this utility model, be for solving the above-mentioned defect of prior art, and a kind of control system that is applied to the flow of hydraulic forging press be provided;
The utility model provides a kind of flow control system of hydraulic forging press, comprising:
Be no less than the duplex pump that is used for controlling this hydraulic press main oil pipe hydraulic fluid flow rate output of a group;
Be used for driving the motor of described duplex pump, and the motor control assembly that is used for controlling described electric motor starting;
Be respectively used to control a control valve group and No. two control valve groups of the two pumps flow output of described duplex pump;
Flow measurement device for the output flow of measuring described flow control system; And
The default output flow that is used for setting control system, and the input/output unit that shows and control the output flow of control system;
It is characterized in that:
Described every duplex pump includes a high-power constant displacement pump and a small-power pump, and wherein the specified output flow of high-power constant displacement pump is two times of specified output flow of small-power pump; Small-power pump in each duplex pump has at least one to be proportional variable pump; Described flow control system also includes for the swash plate device of regulating the rate variable POF, and the proportional servo valve that is used for controlling this swash plate device operation.
Preferably, a described control valve group is with to control valve block structures No. two identical, included pressure-reducing valve, inserted valve, No. two inserted valves, No. three inserted valves and directional control valve; The oil-out of wherein said high-power constant displacement pump/small-power pump is connected with the main hydraulic fluid port F of the main hydraulic fluid port C of the main hydraulic fluid port B of a described inserted valve, No. two inserted valves, No. three inserted valves, the input port of pressure-reducing valve and the input port of directional control valve respectively; The main hydraulic fluid port F of No. three inserted valves is communicated in the oil return pipe of the control valve group at place, the main hydraulic fluid port E of No. three inserted valves is communicated with the main hydraulic fluid port D of No. two inserted valves, No. three inserted valves and the oil pipe composition direction control circuit that is communicated in its directional control valve of controlling mouthful and No. three inserted valves and is connected; The oil pipe of pressure-reducing valve and the number of being connected inserted valve and connection thereof forms pressure-reducing valve group loop; The main hydraulic fluid port A of an inserted valve is communicated in the oil-out of this control valve group.
Preferably, a described control valve group and/or No. two control valve groups are equipped with the oil-out pressure-detecting device.
Preferably, the operation of described motor control assembly is controlled by described input/output unit.Therefore, can also control the work of motor control assembly when described control system can be by described input/output unit centralized displaying and setting control system output flow, thereby control the operation of the motor that is connected with motor control assembly, realized the centralized Control of control system.
Therefore, with respect to prior art, the beneficial effect that the utlity model has is: this control system includes many groups by same motor-driven duplex pump, this duplex pump comprises high-power constant displacement pump and a small-power pump of one, compared to the collocation of adopting high-power proportional variable pump as hydraulic press main oil pipe flow output device fully, originally can be rapider for the raising of output flow, more can meet the demand of the fast large flow of hydraulic press output flow; Before the high-power constant displacement pump of operation, first move the small-power pump, to reduce high-power pump in the impact for the hydraulic press pipeline of the flow of when operation output; Two times of specified output flow of small-power pump due to the specified output flow of high-power constant displacement pump, therefore can reach the default output flow of control system by the high-power constant displacement pump of varying number and the collocation of small-power pump, there is not the blind area that can't accurately reach in output flow, in addition, this control system also includes proportional variable pump, thus, control system can realize the step-less adjustment of output flow; This control system has reduced the use of high-power proportional variable pump, be easy to purchase and low power proportional variable pump that the haul-cycle time more easily guarantees and use, so hydraulic press is guaranteed in the cycle of installation and debugging, and design and the cost of debugging are lower; In addition, because this control system can reduce the use of proportional variable pump as much as possible, and be replaced into be easy to debug, the constant displacement pump of maintenance and later maintenance, the use cost in later stage is lower.
Description of drawings
Fig. 1 is the system block diagram of the embodiment of the control system in the utility model;
Fig. 2 is the hydraulic schematic diagram of part of duplex pump 1, motor 2 and the control valve group 3 of control system;
Fig. 3 is the hydraulic schematic diagram of the control valve group 3 in control system;
Fig. 4 is the schematic flow sheet of the using method of control system.
In figure:
1, duplex pump; 1-1, high-power constant displacement pump; 1-2, small-power pump; 1-21, proportional variable pump; 1-22, small-power constant displacement pump;
2, motor;
3, control valve group; 3-1, a control valve group; 3-2, No. two control valve groups; 3-31, swash plate device; 3-32, proportional servo valve; 3-41, pressure-reducing valve; 3-42, an inserted valve; 3-43, No. two inserted valves; 3-44, No. three inserted valves; 3-45, directional control valve; 3-5, pressure-detecting device;
4, motor control assembly;
5, flow measurement device;
6, input/output unit.
The specific embodiment
, for further understanding utility model content of the present utility model, Characteristic, hereby exemplify following examples, and coordinate accompanying drawing to be described in detail as follows:
For realizing purpose of the present invention, reach corresponding effect, each pump group of using in the present invention is a duplex pump 1.A kind of flow control system of hydraulic forging press comprises:
Be no less than the duplex pump 1 that is used for controlling this hydraulic press main oil pipe hydraulic fluid flow rate output of a group;
Be used for driving the motor 2 of described duplex pump 1, and be used for controlling the motor control assembly 4 that described motor 2 starts; As a kind of embodiment, specifically, motor control assembly 4 can be the multiple circuit for controlling motor that forms by in electric motor starting and stop button, breaker A.C. contactor, electrothermal relay, the time relay and motor start circuit.
Be used for controlling the control valve group 3 of the flow output of described duplex pump 1, be respectively used to control a control valve group 3-1 and No. two control valve group 3-2 of the two pumps flow output of described duplex pump 1;
The default output flow that is used for setting control system, and the input/output unit 6 that shows and control the output flow of control system; Motor control assembly 4 receives the signal of input/output unit 6, and according to this signal, motor 2 is controlled.As a kind of embodiment, specifically, input/output unit 6 is by touch-screen and the programmable controller of intercommunication with it, the user presets the default output stream value of described control system by touch-screen, and will preset the output stream value and send the programmable controller of intercommunication with it to, programmable controller compares after judgement according to different judged results the motor control assembly 4 corresponding signals of output the output flow of default output flow and control system by its internal processes; The real-time output flow that the user can feed back to by touch-screen observed volume measurement mechanism 5, and can carry out by programmable controller next step operation; As another kind of embodiment, input/output unit 6 is industrial computer.Preferably, the operation of described motor control assembly 4 is also controlled by described input/output unit 6.
Described every duplex pump 1 includes a high-power constant displacement pump 1-1 and a small-power pump, and wherein the specified output flow of high-power constant displacement pump 1-1 is two times of specified output flow of small-power pump; Small-power pump in each duplex pump 1 has at least one to be proportional variable pump 1-21, and other small-power pump can be small-power constant displacement pump 1-22; In particular, motor 2 drivings are worked simultaneously by high-power constant displacement pump 1-1 and a small-power pump that shaft coupling connects; The oil-in of a control valve group 3-1 is communicated with the oil-out of described high-power constant displacement pump 1-1, and the oil-in of No. two control valve group 3-2 is communicated with the oil-out of described small-power pump; As a kind of preferred version, a described control valve group 3-1 and/or No. two control valve group 3-2 are equipped with oil-out pressure-detecting device 3-5.Described flow control system also includes for the swash plate device 3-31 that regulates proportional variable pump 1-21 output flow, and the proportional servo valve 3-32 that is used for controlling this swash plate device 3-31 operation.
Please refer to Fig. 3, a described control valve group 3-1 is identical with No. two control valve group 3-2 structures, has included pressure-reducing valve 3-41, inserted valve 3-42, No. two inserted valve 3-43, No. three inserted valve 3-44 and directional control valve 3-45; The oil-out of wherein said high-power constant displacement pump 1-1/ small-power pump is connected with the input port of main hydraulic fluid port F, the pressure-reducing valve 3-41 of the main hydraulic fluid port C of the main hydraulic fluid port B of a described inserted valve 3-42, No. two inserted valve 3-43, No. three inserted valve 3-44 and the input port of directional control valve 3-45 respectively; The main hydraulic fluid port F of No. three inserted valve 3-44 is communicated in the oil return pipe of the control valve group 3 at place, the main hydraulic fluid port E of No. three inserted valve 3-44 is communicated with the main hydraulic fluid port D of No. two inserted valve 3-43, No. three inserted valve 3-44 and the oil pipe composition direction control circuit that is communicated in its directional control valve 3-45 that controls mouthful and No. three inserted valve 3-44 and is connected; The oil pipe of pressure-reducing valve 3-41 and the number of being connected inserted valve 3-43 and connection thereof forms pressure-reducing valve group loop; The main hydraulic fluid port A of an inserted valve 3-42 is communicated in the oil-out of the control valve group 3 at place.The operation principle of control valve group 3 is such: when control valve group 3 is in original state, the control mouth oil pressure of No. three inserted valve 3-44 that directional control valve 3-45 is communicated with is very little or without pressure, when hydraulic oil enters No. three inserted valve 3-44 by the main hydraulic fluid port F of No. three inserted valve 3-44, the spool floating of No. three inserted valve 3-44, hydraulic oil by high-power constant displacement pump 1-1/ small-power pump input is expelled to oil return pipe from the main hydraulic fluid port G by No. three inserted valve 3-44, and the high-power constant displacement pump 1-1/ small-power pump that this control valve group 3 is communicated with does not produce flow output to described control system; When described input/output unit 6 is controlled described directional control valve 3-45 generation evolution, the oil pressure of the control mouth of No. three inserted valve 3-44 increases, the hydraulic oil of high-power constant displacement pump 1-1/ small-power pump input, by the main hydraulic fluid port A output of an inserted valve 3-42, is exported thereby make control system produce flow; When the oil pressure in control valve group 3 is too high, pressure-reducing valve 3-41 opens, the control mouth oil pressure of No. two inserted valve 3-43 that pressure-reducing valve 3-41 is communicated with diminishes, the spool floating of No. two inserted valve 3-43, the hydraulic oil of control valve group 3 inputs inputs to the main hydraulic fluid port E of No. three inserted valve 3-44 by the main hydraulic fluid port D of No. two inserted valve 3-43, hydraulic oil is expelled to oil return pipe by the main hydraulic fluid port G of No. three inserted valve 3-44, and control system does not produce flow output.
Please refer to Fig. 4, the using method of flow control system provided by the utility model, comprise the steps:
1) user presets the default output flow of described control system, and the rated output power of described high-power constant displacement pump 1-1 and small-power pump 1-2;
2) starter motor 2, and described motor 2 drives and is used for reaching the default required duplex pump 1 of output flow;
3) the flow measurement device 5 output flow data that will record input to input/output unit 6, the output flow of the input/output unit 6 described control systems of judgement: if the difference of the output flow of control system and default output flow is less than the specified output flow of described small-power pump, input/output unit 6 outputs signal to motor control assembly 4, load running is also regulated described proportional variable pump 1-21, continue simultaneously judgement, so that the output flow of described control system reaches default output flow; If the difference of the output flow of control system and default output flow is greater than the specified output flow of small-power pump 1-2 and less than the specified output flow of high-power constant displacement pump 1-1, input/output unit 6 outputs signal to motor control assembly 4,2 of load runnings include the small-power pump 1-2 of proportional variable pump 1-21 and regulate, input/output unit 6 continues judgement simultaneously, so that the output flow of control system reaches default output flow; If the difference of the output flow of control system and default output flow is greater than the specified output flow of described high-power constant displacement pump 1-2, motor 2 drives described small-power pump 1-2 load running to specified output flow, and the operation next step;
4) the flow measurement device 5 output flow data that will record input to input/output unit 6, the output flow of the input/output unit 6 described control systems of judgement, if the difference of the output flow of control system and default output flow is less than the specified output flow of described small-power pump 1-2, input/output unit 6 outputs signal to motor control assembly 4, increase operation 1 proportional variable pump 1-21 load and regulate, input/output unit 6 continues judgement simultaneously, to reach default output flow; If the difference of input/output unit 6 judgement output flows and default output flow is greater than the specified output flow of small-power pump 1-2 and less than the specified output flow of high-power constant displacement pump 1-1, input/output unit 6 outputs signal to motor control assembly 4 increases by 2 of load runnings and includes the small-power pump 1-2 of proportional variable pump 1-21 and regulate, input/output unit 6 continues judgement simultaneously, so that the output flow of control system reaches default output flow; If described difference is greater than the specified output flow of described high-power constant displacement pump 1-1, input/output unit 6 outputs signal to the motor control assembly 4 high-power constant displacement pump 1-1 of load running to its specified output flow, and to other duplex pump 1 implementation step 3) running.
Obviously, it may occur to persons skilled in the art that, the output flow of hydraulic press control system belongs to a kind of dynamic physical quantity, it in actual applications, all there is the deviation with default output flow, particularly, as long as the deviation of the output flow of control system and default output flow can think that the output flow of control system reaches default output flow within 0.6% scope.
Claims (4)
1. the flow control system of a hydraulic forging press, include
Be no less than the duplex pump that is used for controlling this hydraulic press main oil pipe hydraulic fluid flow rate output of;
Be used for driving the motor of described duplex pump, and the motor control assembly that is used for controlling described electric motor starting;
Be respectively used to control a control valve group and No. two control valve groups of the two pumps flow output of described duplex pump;
Flow measurement device for the output flow of measuring described flow control system; And
Be used for the default output flow of setting control system and the input/output unit that shows and control the output flow of control system;
It is characterized in that:
Described every duplex pump includes a high-power constant displacement pump and a small-power pump, and wherein the specified output flow of high-power constant displacement pump is two times of specified output flow of small-power pump; Include proportional variable pump in small-power pump in each duplex pump; Described flow control system also includes for the swash plate device of regulating the rate variable POF, and the proportional servo valve that is used for controlling this swash plate device operation.
2. control system according to claim 1 is characterized in that: a described control valve group is with to control valve block structures No. two identical, included pressure-reducing valve, inserted valve, No. two inserted valves, No. three inserted valves and directional control valve; The oil-out of wherein said high-power constant displacement pump/small-power pump is connected with the main hydraulic fluid port F of the main hydraulic fluid port C of the main hydraulic fluid port B of a described inserted valve, No. two inserted valves, No. three inserted valves, the input port of pressure-reducing valve and the input port of directional control valve respectively; The main hydraulic fluid port F of No. three inserted valves is communicated in the oil return pipe of the control valve group at place, the main hydraulic fluid port E of No. three inserted valves is communicated with the main hydraulic fluid port D of No. two inserted valves, No. three inserted valves and the oil pipe composition direction control circuit that is communicated in its directional control valve of controlling mouthful and No. three inserted valves and is connected; The oil pipe of pressure-reducing valve and the number of being connected inserted valve and connection thereof forms pressure-reducing valve group loop; The main hydraulic fluid port A of an inserted valve is communicated in the oil-out of this control valve group.
According to claim 1 and 2 in the described control system of any one, it is characterized in that: a described control valve group and/or No. two control valve groups are equipped with the oil-out pressure-detecting device.
According to claim 1 and 2 in the described control system of any one, it is characterized in that: the operation of described motor control assembly is controlled by described input/output unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202879245U CN203281784U (en) | 2013-05-22 | 2013-05-22 | Flow control system of forging hydraulic press |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202879245U CN203281784U (en) | 2013-05-22 | 2013-05-22 | Flow control system of forging hydraulic press |
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| CN203281784U true CN203281784U (en) | 2013-11-13 |
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| CN2013202879245U Withdrawn - After Issue CN203281784U (en) | 2013-05-22 | 2013-05-22 | Flow control system of forging hydraulic press |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103286250A (en) * | 2013-05-22 | 2013-09-11 | 天津市天锻压力机有限公司 | Control system and control method for flow of pump set of forging hydraulic machine |
| CN104775953A (en) * | 2015-04-10 | 2015-07-15 | 河北工程大学 | Multi-path energy saving fuel oil supply system |
| CN105268890A (en) * | 2014-06-20 | 2016-01-27 | 天津市天锻压力机有限公司 | Pull rod heating pre-tightening electrical system of isothermal hydraulic forging press |
| CN106862455A (en) * | 2017-02-03 | 2017-06-20 | 清华大学 | Have the heavy difunctional press Moving beam balance control loop of backhaul and loading function concurrently |
-
2013
- 2013-05-22 CN CN2013202879245U patent/CN203281784U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103286250A (en) * | 2013-05-22 | 2013-09-11 | 天津市天锻压力机有限公司 | Control system and control method for flow of pump set of forging hydraulic machine |
| CN103286250B (en) * | 2013-05-22 | 2017-11-03 | 天津市天锻压力机有限公司 | The control system and its control method of hydraulic forging press pump group flow |
| CN105268890A (en) * | 2014-06-20 | 2016-01-27 | 天津市天锻压力机有限公司 | Pull rod heating pre-tightening electrical system of isothermal hydraulic forging press |
| CN104775953A (en) * | 2015-04-10 | 2015-07-15 | 河北工程大学 | Multi-path energy saving fuel oil supply system |
| CN106862455A (en) * | 2017-02-03 | 2017-06-20 | 清华大学 | Have the heavy difunctional press Moving beam balance control loop of backhaul and loading function concurrently |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20131113 Effective date of abandoning: 20171103 |
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| AV01 | Patent right actively abandoned |