CN104384479A - Low-pressure liquid level pressurization control system - Google Patents
Low-pressure liquid level pressurization control system Download PDFInfo
- Publication number
- CN104384479A CN104384479A CN201410789159.6A CN201410789159A CN104384479A CN 104384479 A CN104384479 A CN 104384479A CN 201410789159 A CN201410789159 A CN 201410789159A CN 104384479 A CN104384479 A CN 104384479A
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- Prior art keywords
- pressure
- valve
- reducing valve
- control system
- liquid level
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/08—Controlling, supervising, e.g. for safety reasons
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Fluid Pressure (AREA)
Abstract
The invention discloses a low-pressure liquid level pressurization control system for controlling the level of a metal liquid inside a heat-preservation furnace of a low-pressure casting machine. A manual ball valve, a first filter, a first pressure gauge, a first pressure reducing valve, a first main path on/off valve, a second pressure reducing valve and a second main path on/off valve, which are connected with a gas source, are sequentially arranged on a main gas inlet path; a first branch is arranged between the pressure reducing valve and the second pressure reducing valve; a proportional valve is arranged on the first branch; a second bracket is arranged between the first pressure reducing valve and the second main path/on/off valve; a first feedback circuit and a second feedback circuit are arranged inside the heat-preservation furnace; a first pressure sensor and a second pressure sensor are arranged on the first feedback circuit; a third pressure sensor and a fourth pressure sensor are arranged on the second feedback circuit. By adopting the low-pressure liquid level pressurization control system, the pressure inside the heat-preservation furnace is effectively detected, the pressure data can be adjusted in a real-time manner, and the quality of a cast part is ensured.
Description
Technical field
The present invention relates to Casting Equipment technical field, particularly a kind of low pressure liquid level pressurizing control system.
Background technology
Low pressure liquid level pressurizing control system is the important component part of non-ferrous metal low pressure casting, is mainly used in controlling the liquid metal filling in low pressure casting process.The stability of low pressure casting pouring technology directly affects the yield rate of low pressure casting, the Liquid Level Pressure device with good repetition performance is the basis and the prerequisite that realize stable pouring technology, being the key components of low pressure casting, is the basic assurance of low-pressure casting casting quality.
The thing semi-closed loop system of the fluid level control system employing of existing most domestic air injection machine; and be provided with single pressure sensing control backfeed loop; when carrying out the detection being incubated furnace pressure; frequent meeting blockage phenomenon; because of feedback loop signal not in time or backfeed loop fault cause and can't detect feedback air pressure; cause leakage compensation and level compensation delayed; foundry goods is caused to fill type defect in process of production; fill in type and there is shrinkage cavity and shrinkage porosite, even directly cause the foundry goods of production defective.And not feeding back air pressure, air inlet main road is just suppressing the generation that ventilation easily causes accident always.
Summary of the invention
For overcoming problems of the prior art, the invention provides a kind of pressure detecting and controlling feedback effects well, the low pressure liquid level pressurizing control system that yield rate is high.
The present invention solves the technical scheme that its technical problem takes: this kind of low pressure liquid level pressurizing control system, comprise intake and exhaust road and holding furnace, it is characterized in that: described intake and exhaust road comprises air inlet main road, described air inlet main road is provided with the manual ball valve be connected with source of the gas successively, the first filter, the first Pressure gauge, the first pressure-reducing valve, the first main road on-off valve, the second pressure-reducing valve and the second main road on-off valve; Between the first pressure-reducing valve and the second pressure-reducing valve, be provided with the first branch road, described first branch road is provided with proportioning valve; The second branch road is provided with between the first pressure-reducing valve and the second main road on-off valve; Between the second main road on-off valve and holding furnace, be provided with the 3rd branch road, described 3rd branch road is provided with air bleeding valve and on-off valve; Two pressure feed back loop are provided with in holding furnace, i.e. the first backfeed loop and second feed back loop, first backfeed loop is provided with the first pressure sensor and the second pressure sensor, second feed back loop is provided with the 3rd pressure sensor and the 4th pressure sensor.
Further, the second filter is provided with between described air inlet main road first filter and Pressure gauge.
Further, the first described pressure-reducing valve delivery outlet is provided with Pressure gauge.
Further, described 3rd branch road on-off valve is also connected with source of the gas.
Further, described first pressure sensor, the second pressure sensor and the 3rd pressure sensor, the 4th pressure sensor input port are all connected with Pressure gauge.
Further, the second described pressure-reducing valve is high-flow pressure reducing valve.
To sum up, the beneficial effect of technique scheme of the present invention is as follows: by arranging two pressure feed back loop, two pressure feed back loop are detected separately, carry out data each other to compare, be input in control system by comparative result and process, control system adjusts data, thus actual pressure curve is overlapped as much as possible with the desired pressure curve of setting, can better controlled pressure, keep the stable of air pressure, realize controlling more accurately.Leakage compensation in holding furnace and level compensation accurately and timely can be compensated, and then effectively control defects such as filling type deficiency, shrinkage cavity and porosity, improve the qualification rate of foundry goods.
Accompanying drawing explanation
Fig. 1 is Control system architecture schematic diagram of the present invention.
In figure: 1 holding furnace, 2 pneumatic ball valves, 3 first filters, 4 Pressure gauges, 5 first pressure-reducing valves, 6 first main road on-off valves, 7 second pressure-reducing valves, 8 second main road on-off valves, 9 proportioning valves, 10 air bleeding valves, 11 on-off valves, 12 first pressure sensors, 13 second pressure sensors, 14 the 3rd pressure sensors, 15 the 4th pressure sensors, 16 second filters.
Detailed description of the invention
Be described in detail to characteristic sum principle of the present invention below in conjunction with accompanying drawing, illustrated embodiment, only for explaining the present invention, not limits protection scope of the present invention with this.
As shown in Figure 1, a kind of low pressure liquid level pressurizing control system, comprise intake and exhaust road and holding furnace 1, stalk and mould is provided with in holding furnace, compressed air enters in holding furnace by intake and exhaust road, and the molten metal of holding furnace rises along stalk under from the compressed-air actuated pressure effect of air inlet main road, is filled in mould, there is the situation revealed and cause liquid level rising not enough in this course, therefore need to carry out leakage compensation and level compensation by pressure detecting and FEEDBACK CONTROL.
Described intake and exhaust road comprises air inlet main road, described air inlet main road is provided with successively be connected with source of the gas manual ball valve (for realizing the break-make of pipeline), the first filter, the first Pressure gauge, the first pressure-reducing valve, the first main road on-off valve, the second pressure-reducing valve and the second main road on-off valve.First filter plays the filtration from source gas, ensures the degree of purity of gas, and reducing the impurity contained in gas affects casting quality.Be provided with Pressure gauge at the delivery outlet end of the first pressure-reducing valve, namely the input port of the first pressure-reducing valve and delivery outlet end are provided with Pressure gauge, respectively to detect the depressurization of the first pressure-reducing valve.First pressure-reducing valve, while serving depressurization, also ensure that downstream pressure is stabilized in certain scope, is transported in holding furnace, improves the castability of foundry goods by stable pressure through follow-up air inlet main road.
Between the first pressure-reducing valve and the second pressure-reducing valve, be provided with the first branch road, described first branch road is provided with proportioning valve.The second described pressure-reducing valve can select the pressure-reducing valve of large discharge, plays the effect of further lowering and stabilizing blood pressure; Described proportioning valve makes the pressure exported become certain ratio with the pressure of input, realizes the continuous control to flow.
The second branch road is provided with between the first pressure-reducing valve and the second main road on-off valve; Between the second main road on-off valve and holding furnace, be provided with the 3rd branch road, described 3rd branch road is provided with air bleeding valve and on-off valve, further, this on-off valve can be connected with source of the gas.Two pressure feed back loop are provided with in holding furnace, i.e. the first backfeed loop and second feed back loop, first backfeed loop is provided with the first pressure sensor and the second pressure sensor, second feed back loop is provided with the 3rd pressure sensor and the 4th pressure sensor.
Two described pressure feed back loop work independently, holding furnace pressure condition is detected by the pressure sensor on respective backfeed loop, after detection completes, by in pressure data input control system that two backfeed loops detect, control system is carried out contrast to data and is compared, and the data result according to comparing adjusts again to data.Pressure data after adjustment is input to proportioning valve again by control system, thus actual pressure curve is overlapped as much as possible with the desired pressure curve of setting (in control system, be provided with human-computer interaction interface, the adjustment situation seeing pressure curve can be known), pressure data after adjustment enters in holding furnace by air inlet main road, ensure that air pressure stable in holding furnace, achieve the Real-Time Monitoring to air pressure, controlling and adjustment.Ensure that the castability of foundry goods, improve the yield rate of foundry goods.
Further, and then the second filter can be set after the first filter, and the filtering accuracy of the second filter is higher, ensure that the gaseous mass entered in holding furnace fully, thus ensure the castability of foundry goods.
All Pressure gauge can also be connected with in the first pressure sensor, the second pressure sensor and the 3rd pressure sensor, the 4th pressure sensor input port.With the pressure condition of real-time monitored two pressure feed back loop.
Above-described embodiment is only the description carried out the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; relevant technical staff in the field, to various distortion of the present invention and improvement, all should expand in the determined protection domain of claims of the present invention.
Claims (6)
1. a low pressure liquid level pressurizing control system, comprise intake and exhaust road and holding furnace, it is characterized in that: described intake and exhaust road comprises air inlet main road, described air inlet main road is provided with successively the manual ball valve, the first filter, the first Pressure gauge, the first pressure-reducing valve, the first main road on-off valve, the second pressure-reducing valve and the second main road on-off valve that are connected with source of the gas; Between the first pressure-reducing valve and the second pressure-reducing valve, be provided with the first branch road, described first branch road is provided with proportioning valve; The second branch road is provided with between the first pressure-reducing valve and the second main road on-off valve; Between the second main road on-off valve and holding furnace, be provided with the 3rd branch road, described 3rd branch road is provided with air bleeding valve and on-off valve; Two pressure feed back loop are provided with in holding furnace, i.e. the first backfeed loop and second feed back loop, first backfeed loop is provided with the first pressure sensor and the second pressure sensor, second feed back loop is provided with the 3rd pressure sensor and the 4th pressure sensor.
2. a kind of low pressure liquid level pressurizing control system according to claim 1, is characterized in that: be provided with the second filter between described air inlet main road first filter and Pressure gauge.
3. a kind of low pressure liquid level pressurizing control system according to claim 1, is characterized in that: the first described pressure-reducing valve delivery outlet is provided with Pressure gauge.
4. a kind of low pressure liquid level pressurizing control system according to claim 1, is characterized in that: described 3rd branch road on-off valve is also connected with source of the gas.
5. a kind of low pressure liquid level pressurizing control system according to claim 1, is characterized in that: described first pressure sensor, the second pressure sensor and the 3rd pressure sensor, the 4th pressure sensor input port are all connected with Pressure gauge.
6. a kind of low pressure liquid level pressurizing control system according to claim 1, is characterized in that: the second described pressure-reducing valve is high-flow pressure reducing valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410789159.6A CN104384479A (en) | 2014-12-18 | 2014-12-18 | Low-pressure liquid level pressurization control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410789159.6A CN104384479A (en) | 2014-12-18 | 2014-12-18 | Low-pressure liquid level pressurization control system |
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| CN104384479A true CN104384479A (en) | 2015-03-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410789159.6A Pending CN104384479A (en) | 2014-12-18 | 2014-12-18 | Low-pressure liquid level pressurization control system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108580847A (en) * | 2018-07-26 | 2018-09-28 | 哈尔滨工业大学 | A kind of non-linear pressurizing control system of complexity metal component counter-pressure casting molding |
| CN111570763A (en) * | 2020-05-18 | 2020-08-25 | 江苏大学 | Low-pressure casting liquid level pressurization system, method and equipment |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61253158A (en) * | 1985-05-04 | 1986-11-11 | Sintokogio Ltd | Low-pressure casting device |
| CN2880326Y (en) * | 2005-11-21 | 2007-03-21 | 浙江万丰科技开发有限公司 | Liquid level pressurization system of low pressure casting machine |
| CN101786152A (en) * | 2010-03-19 | 2010-07-28 | 上海皮尔博格有色零部件有限公司 | Low-pressure casting machine and liquid level pressurizing control system |
| CN201684915U (en) * | 2010-03-19 | 2010-12-29 | 上海皮尔博格有色零部件有限公司 | Low pressure casting machine and liquid surface pressurization control system thereof |
| CN203887207U (en) * | 2014-06-11 | 2014-10-22 | 烟台路通精密铝业有限公司 | Closed-loop liquid level control system for low-pressure casting machine |
| CN204338832U (en) * | 2014-12-18 | 2015-05-20 | 济南圣元机械工程有限公司 | A kind of low pressure liquid level pressurizing control system |
-
2014
- 2014-12-18 CN CN201410789159.6A patent/CN104384479A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61253158A (en) * | 1985-05-04 | 1986-11-11 | Sintokogio Ltd | Low-pressure casting device |
| CN2880326Y (en) * | 2005-11-21 | 2007-03-21 | 浙江万丰科技开发有限公司 | Liquid level pressurization system of low pressure casting machine |
| CN101786152A (en) * | 2010-03-19 | 2010-07-28 | 上海皮尔博格有色零部件有限公司 | Low-pressure casting machine and liquid level pressurizing control system |
| CN201684915U (en) * | 2010-03-19 | 2010-12-29 | 上海皮尔博格有色零部件有限公司 | Low pressure casting machine and liquid surface pressurization control system thereof |
| CN203887207U (en) * | 2014-06-11 | 2014-10-22 | 烟台路通精密铝业有限公司 | Closed-loop liquid level control system for low-pressure casting machine |
| CN204338832U (en) * | 2014-12-18 | 2015-05-20 | 济南圣元机械工程有限公司 | A kind of low pressure liquid level pressurizing control system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108580847A (en) * | 2018-07-26 | 2018-09-28 | 哈尔滨工业大学 | A kind of non-linear pressurizing control system of complexity metal component counter-pressure casting molding |
| CN111570763A (en) * | 2020-05-18 | 2020-08-25 | 江苏大学 | Low-pressure casting liquid level pressurization system, method and equipment |
| CN111570763B (en) * | 2020-05-18 | 2021-12-21 | 江苏大学 | Low-pressure casting liquid level pressurization system, method and equipment |
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Application publication date: 20150304 |