CN204338832U - A kind of low pressure liquid level pressurizing control system - Google Patents
A kind of low pressure liquid level pressurizing control system Download PDFInfo
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- CN204338832U CN204338832U CN201420811315.XU CN201420811315U CN204338832U CN 204338832 U CN204338832 U CN 204338832U CN 201420811315 U CN201420811315 U CN 201420811315U CN 204338832 U CN204338832 U CN 204338832U
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Abstract
A kind of low pressure liquid level pressurizing control system, for the control to low pressure casting machine holding furnace inner metal liquid liquid level, air inlet main road is provided with successively the manual ball valve be connected with source of the gas, 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, the first branch road is provided with proportioning valve; Between the first pressure-reducing valve and the second main road on-off valve, be provided with the second branch road, be provided with the 3rd branch road between the second main road on-off valve and holding furnace, the 3rd branch road is provided with air bleeding valve and on-off valve; Be provided with the first backfeed loop and second feed back loop in holding furnace, the 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.This utility model effectively achieves pressure detecting in holding furnace and adjusts in real time pressure data, ensure that casting quality.
Description
Technical field
The utility model 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.
Utility model content
For overcoming problems of the prior art, the utility model provides a kind of pressure detecting and controls feedback effects well, the low pressure liquid level pressurizing control system that yield rate is high.
The technical scheme in the invention for solving the technical problem is: 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 utility model 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 the utility model Control system architecture schematic diagram.
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 utility model below in conjunction with accompanying drawing, illustrated embodiment, only for explaining the utility model, not limits protection domain of the present utility model 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 preferred embodiment of the present utility model; not scope of the present invention is limited; under the prerequisite not departing from the utility model design spirit; relevant technical staff in the field, to various distortion of the present utility model and improvement, all should expand in the determined protection domain of the utility model claims.
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.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420811315.XU CN204338832U (en) | 2014-12-18 | 2014-12-18 | A kind of low pressure liquid level pressurizing control system |
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| CN201420811315.XU CN204338832U (en) | 2014-12-18 | 2014-12-18 | A kind of low pressure liquid level pressurizing control system |
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| CN204338832U true CN204338832U (en) | 2015-05-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104384479A (en) * | 2014-12-18 | 2015-03-04 | 济南圣元机械工程有限公司 | Low-pressure liquid level pressurization control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104384479A (en) * | 2014-12-18 | 2015-03-04 | 济南圣元机械工程有限公司 | Low-pressure liquid level pressurization control system |
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