Negative pressure control system of quantitative furnace

Abstract

The utility model relates to the technical field of quantitative furnaces, in particular to a quantitative furnace negative pressure control system, which comprises a PLC (programmable logic controller), a gas source component, a proportioning valve, a vacuum generator and a negative pressure transmitter, and is characterized in that the PLC is electrically connected with the gas source component, the proportioning valve, the vacuum generator and the negative pressure transmitter respectively; the gas source assembly is connected with the vacuum generator, the other end of the vacuum generator is communicated with the hearth, the negative pressure transmitter is arranged on a pipeline branch where the vacuum generator is connected with the hearth, and the proportioning valve is arranged on a connecting pipeline between the vacuum generator and the gas source assembly. The control system is simple in structure, utilizes a feedback regulation mechanism, controls the proportioning valve and the vacuum generator through the PLC, monitors and regulates the negative pressure in the hearth in real time, and effectively prevents the influence of too high temperature on vacuum components.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of quantitative furnace, especially relates to a quantitative furnace negative pressure control system. BACKGROUND

[0002] Quantitative furnace is a very important equipment in die-casting die production, which plays a crucial role in improving the quality and production efficiency of die-casting parts by accurately controlling the supply amount and temperature of the metal liquid; quantitative furnace can accurately control the amount of metal liquid sent into the die-casting die to ensure the consistency of the metal liquid amount for each die-casting. Quantitative furnace can maintain the aluminum liquid at a suitable temperature to ensure the fluidity of the melt, so as to perfect the mold filling and reduce the casting defects caused by temperature fluctuation, such as pinhole, shrinkage, peeling, bubble and hot crack. Compared with the traditional soup feeding system, quantitative furnace can reduce the exposure time of aluminum water in the air, reduce the loss of aluminum and energy consumption, and at the same time improve the cleanliness of the aluminum liquid. The accurate metering function of quantitative furnace can reduce the waste of aluminum and reduce the heat loss, thereby improving the quality of the casting and reducing the production cost.

[0003] In the prior art, electric heating furnace or gas furnace is often used for heating and heat preservation of aluminum liquid. However, since the aluminum liquid is easily affected by oxygen and moisture in the air at high temperature, the aluminum liquid is oxidized and the hydrogen content is increased, which affects the quality of aluminum alloy. In order to solve this problem, some technical solutions use negative pressure control to reduce the air content in the furnace, thereby reducing the oxidation of aluminum liquid and the absorption of hydrogen. The existing negative pressure control system mostly uses simple mechanical valve adjustment, but it has defects in accurate control and response speed. Specifically, it is shown that:

[0004] 1. Slow response speed: the traditional valve control mode is not sensitive to the response, and it is difficult to adjust the furnace negative pressure in real time.

[0005] 2. Low efficiency: unable to realize efficient negative pressure maintenance, affecting the improvement of the quality of aluminum liquid.

[0006] Therefore, the above problems need to be solved. UTILITY MODEL CONTENT

[0007] The utility model relates to the technical field of quantitative furnace, especially relates to a quantitative furnace negative pressure control system.

[0008] Technical solution: In order to achieve the above-mentioned purpose, the utility model provides a kind of quantitative furnace negative pressure control system, including PLC controller, gas source component, proportional regulating valve, vacuum generator and negative pressure transmitter, the PLC controller is respectively in gas source component, proportional regulating valve, vacuum generator and negative pressure transmitter electrical connection;

[0009] The gas source component is connected with the vacuum generator, another end of the vacuum generator is communicated with the hearth, the negative pressure transmitter is arranged on the pipeline branch connected with the vacuum generator and the hearth, and the proportional regulating valve is arranged on the connecting pipeline between the vacuum generator and the gas source component. The negative pressure transmitter can obtain the negative pressure state in the hearth and feed back the information to the PLC controller, and the PLC controller can control the proportional regulating valve and the vacuum generator to adjust the negative pressure state.

[0010] Further, one end of the gas source component away from the vacuum generator is connected with a gas source supply pipe.

[0011] Further, a pressure gauge is arranged on the gas source component, and a silencer is arranged on the gas source component. The worker can directly see the gas source pressure through the pressure gauge, and the silencer can assist in eliminating the working noise.

[0012] Further, the proportional regulating valve is a direct-acting electromagnetic valve integrated with pressure compensation. The proportional regulating valve adopts a direct-acting electromagnetic valve integrated with pressure compensation, which provides dynamic and accurate regulating capacity even in the case of large nominal diameter, and meets various use scenarios.

[0013] Further, a silencer is arranged on the proportional regulating valve.

[0014] Further, the vacuum generator is a jet type atmospheric nozzle passage diameter vacuum generator. The jet type atmospheric nozzle passage diameter vacuum generator ensures rapid establishment of negative pressure.

[0015] Further, a silencer is arranged on the vacuum generator.

[0016] Further, the negative pressure transmitter is a high-precision negative pressure sensor. The high-precision negative pressure sensor can feed back the negative pressure information in the hearth to the PLC controller more accurately.

[0017] The above technical solution can be seen that, compared with prior art, the utility model has the following beneficial effects:

[0018] The utility model provides a kind of quantitative furnace negative pressure control system, compressed air is supplied to the entrance of gas source assembly and is adjusted to the air pressure required by system, the air pressure of vacuum generator air inlet is accurately adjusted by proportional regulating valve.The control of proportional regulating valve and vacuum generator can affect the flow of airflow, so as to adjust the speed of furnace extraction.The actual negative pressure value inside furnace is fed back by negative pressure transmitter, data is transmitted to PLC controller, and the speed of furnace extraction is dynamically adjusted by PLC controller, the negative pressure inside furnace is controlled to keep in preset range, ensure the stability and accuracy of control, and effectively prevent the influence of excessively high temperature on vacuum component. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the pneumatic schematic diagram of the quantitative furnace negative pressure control system of the utility model.

[0020] In the drawing: 1-gas source assembly, 11-pressure gauge, 2-proportional regulating valve, 3-vacuum generator, 4-negative pressure transmitter. DETAILED DESCRIPTION

[0021] It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.

[0022] As Figure 1 Shown, a kind of quantitative furnace negative pressure control system, including PLC controller, gas source assembly 1, proportional regulating valve 2, vacuum generator 3 and negative pressure transmitter 4, the PLC controller is electrically connected with gas source assembly 1, proportional regulating valve 2, vacuum generator 3 and negative pressure transmitter 4 respectively;In this embodiment, main controller uses PLC controller, it has real-time monitoring and control function, can program setting negative pressure range and alarm system.

[0023] The gas source assembly 1 is connected with the vacuum generator 3, the other end of the vacuum generator 3 is communicated with furnace, the negative pressure transmitter 4 is arranged on the pipe branch of vacuum generator 3 and furnace connection, the proportional regulating valve 2 is arranged on the connecting pipe between vacuum generator 3 and gas source assembly 1.

[0024] Specifically, the one end of the gas source assembly 1 away from the vacuum generator 3 is connected with gas source supply pipe.

[0025] Specifically, the pressure gauge 11 is equipped on the gas source assembly 1, and the silencer is arranged on the gas source assembly 1.Further optimization scheme, gas source assembly 2 selects freely combinable function module, is equipped with switch valve, pressure regulating valve, pressure sensor, to ensure that system is fast, reliably exhausts and exhausts.

[0026] The proportional regulating valve 2 is a direct-acting electromagnetic valve with integrated pressure compensation. The proportional regulating valve 2 amplifies the received instruction signal through a proportional amplifier, and outputs current to the proportional electromagnet of the proportional valve in proportion, and the proportional electromagnet outputs force and moves the valve core in proportion, so as to control the flow of gas in proportion. Even in the case of a large nominal diameter, the direct-acting electromagnetic valve with integrated pressure compensation provides dynamic and accurate regulation capability.

[0027] Preferably, the proportional regulating valve 2 is provided with a silencer.

[0028] Specifically, the vacuum generator 3 is a jet type atmospheric nozzle diameter vacuum generator.

[0029] Optionally or preferably, the vacuum generator 3 is provided with a silencer.

[0030] In addition, the negative pressure transmitter 4 is a high-precision negative pressure sensor.

[0031] In this embodiment, the PLC controller uses PID control to adjust the proportional regulating valve 2 and the vacuum generator 3. The specific working principle is as follows:

[0032] First, start the heater to heat the aluminum liquid to the set temperature, and then set the air extraction time period and air extraction time duty cycle. After the vacuum generator 3 is started, it begins to extract air in the furnace to form a negative pressure. The negative pressure transmitter 4 monitors the negative pressure state in the furnace in real time and transmits the negative pressure information to the PLC controller. The PLC controller adjusts the negative pressure state in real time to prepare for aluminum liquid transportation. Before the aluminum liquid is transported, a certain negative pressure state is maintained to prevent the aluminum liquid from contacting air.

[0033] As shown in Figure 1 The air source assembly 1 inlet supplies compressed air and adjusts the air pressure required by the system. The proportional regulating valve 2 accurately adjusts the air pressure at the air inlet of the vacuum generator 3. The control of the proportional regulating valve 2 and the vacuum generator 3 can affect the flow of air flow, so as to adjust the air extraction speed of the furnace. The actual negative pressure value inside the furnace is fed back through the negative pressure transmitter 4, and the data is transmitted to the PLC controller. The PLC controller dynamically adjusts the air extraction speed of the furnace to control the negative pressure inside the furnace to be kept in the preset range, and effectively prevents the influence of high temperature on the vacuum components.

[0034] In summary, the negative pressure control system can efficiently and stably realize the air extraction task through accurate negative pressure control, combined with the air source assembly, the proportional regulating valve, the vacuum generator, the negative pressure transmitter and the PLC controller.

[0035] The above merely is the preferred embodiment of the present application, it should be pointed out that, for ordinary skilled person in the art, without departing from the principles of the present application, can make a number of improvements, these improvements also should be considered as the protection scope of the present application.

Claims

1. A quantitative furnace negative pressure control system, characterized in that: It comprises a PLC controller, a gas source assembly (1), a proportional regulating valve (2), a vacuum generator (3) and a negative pressure transmitter (4), wherein the PLC controller is electrically connected with the gas source assembly (1), the proportional regulating valve (2), the vacuum generator (3) and the negative pressure transmitter (4) respectively. The gas source assembly (1) is connected with the vacuum generator (3), the other end of the vacuum generator (3) is communicated with a furnace, the negative pressure transmitter (4) is arranged on a branch pipeline of the vacuum generator (3) and the furnace, and the proportional regulating valve (2) is arranged on a connecting pipeline between the vacuum generator (3) and the gas source assembly (1).

2. The negative pressure control system for a batch oven of claim 1, wherein, One end of the gas source assembly (1) away from the vacuum generator (3) is connected with a gas source supply pipeline.

3. The negative pressure control system for a batch oven of claim 1, wherein, A pressure gauge (11) is arranged on the gas source assembly (1), and a silencer is arranged on the gas source assembly (1).

4. The negative pressure control system for a batch oven of claim 1, wherein, The proportional regulating valve (2) is a direct-acting electromagnetic valve with integrated pressure compensation.

5. The negative pressure control system for a batch oven of claim 1, wherein, A silencer is arranged on the proportional regulating valve (2).

6. The negative pressure control system for a batch oven of claim 1, wherein, The vacuum generator (3) is a jet type atmospheric nozzle diameter vacuum generator.

7. The negative pressure control system for a batch oven of claim 1, wherein, A silencer is arranged on the vacuum generator (3).

8. The negative pressure control system for a batch oven of claim 1, wherein, The negative pressure transmitter (4) is a high-precision negative pressure sensor.

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