Automatic liquid level control device

Abstract

The utility model relates to an automatic liquid level control device which comprises a standing furnace, a filter box, a degassing box and a flow table, the standing furnace is provided with a PLC, molten aluminum is contained in the standing furnace and enters the flow table through the filter box and the degassing box, a rear flow groove of the flow table is provided with a first liquid level monitoring module, and the first liquid level monitoring module is used for detecting the liquid level of the rear flow groove of the flow table. A second liquid level monitoring module is arranged above a front flow groove of the flow table, the first liquid level monitoring module and the second liquid level monitoring module both comprise non-contact liquid level sensors, and the output ends of the non-contact liquid level sensors are connected with the input end of the PLC; the second liquid level monitoring module is provided with an installation mechanism, the installation mechanism is provided with a heat dissipation mechanism, and the heat dissipation mechanism is electrically connected with the PLC. The second liquid level monitoring module is additionally arranged at the front end of the flow table, the first liquid level monitoring module is combined to monitor the liquid level in the flow table, and a hardware basis is provided for high-low comparison of the liquid level in the flow table through the PLC.

Description

Technical Field

[0001] The utility model belongs to the field of aluminum processing, and particularly relates to a liquid level automatic control device. Background Technique

[0002] During the casting process of aluminum ingots, automatic flow control is realized through the tilting liquid level control of the holding furnace. At present, during casting, the molten aluminum passes through a filter box, a degassing box, tube filtration or deep bed filtration and then enters the flow pan. The pipeline of the middle chute is too long and there is no liquid level signal feedback. Once there is a problem with the filter box or the degassing box, the flow rate of the molten aluminum becomes abnormal, which is likely to cause the phenomenon of flow interruption or liquid level overflow. Once the liquid level is too high, a large amount of molten aluminum overflows onto the platform and enters the casting well, which is extremely likely to cause an explosion accident and there are potential safety hazards.

[0003] Therefore, there is an urgent need for a centering automatic measuring device that can detect whether the placement position of the aluminum ingot is appropriate and provide detection data for adjustment. Summary of the Invention

[0004] The utility model provides a liquid level automatic control device to solve the problem that the pipeline of the middle chute is too long and there is no liquid level signal feedback. A second liquid level monitoring module is installed at the front end of the flow pan, and together with the first liquid level monitoring module, it monitors the liquid level in the flow pan, providing a hardware basis for the PLC controller to compare the high and low liquid levels in the flow pan.

[0005] To achieve the above object, the utility model provides a liquid level automatic control device, including a holding furnace, a filter box, a degassing box and a flow pan. The holding furnace is provided with a PLC controller, and there is molten aluminum in the holding furnace. The molten aluminum enters the flow pan through the filter box and the degassing box. A first liquid level monitoring module is arranged in the rear chute of the flow pan, and the first liquid level monitoring module is used to detect the liquid level of the rear chute of the flow pan. A second liquid level monitoring module is arranged above the front chute of the flow pan. Both the first liquid level monitoring module and the second liquid level monitoring module include non-contact liquid level sensors, and the output end of the non-contact liquid level sensor is connected to the input end of the PLC controller;

[0006] The second liquid level monitoring module is provided with an installation mechanism, and a heat dissipation mechanism is arranged on the installation mechanism. The heat dissipation mechanism is electrically connected to the PLC controller.

[0007] Furthermore, the non-contact liquid level sensor includes a laser ranging sensor, and the probe of the laser ranging sensor faces downward and is perpendicular to the flow pan.

[0008] The temperature of the molten aluminum is relatively high. The non-contact liquid level sensor is not affected by temperature and has high detection accuracy.

[0009] Further, the installation mechanism includes a housing and a bracket. The housing is a box structure with a hollow interior and an open side. A detection hole is provided at the bottom of the housing, and a box door is hinged at the open end of the housing.

[0010] A square installation hole is provided on the housing, and a heat dissipation mechanism is fixedly arranged at the position of the installation hole.

[0011] The housing is provided to protect the second liquid level monitoring module. Since the temperature of the molten aluminum is relatively high, the heat dissipation mechanism is provided to dissipate heat from the second liquid level monitoring module, ensuring the normal operation of the second liquid level monitoring module in a high-temperature environment.

[0012] Further, the bracket is a T-shaped structure. The housing is arranged on the horizontal section of the bracket. The horizontal section of the bracket and the housing are fixed by bolts, and the vertical section of the bracket is fixed to the ground.

[0013] The bracket is provided. The bracket is used to arrange the housing and the second liquid level monitoring module above the front flow groove of the flow pan, providing a stable detection platform for the second liquid level monitoring module.

[0014] In order to reduce the influence of the high temperature of the molten aluminum on the second liquid level monitoring module, the vertical section of the bracket has a certain height so that the horizontal section of the bracket is far from the ground.

[0015] Further, the heat dissipation mechanism includes an exhaust fan. A relay is arranged between the exhaust fan and the PLC controller. The coil of the relay is connected to the output end of the PLC controller, the normally open contact of the relay is connected to the exhaust fan, and the exhaust fan forms a loop by connecting to the power supply through the normally open contact of the relay.

[0016] Through the above technical solutions, the beneficial effects of the present utility model are as follows:

[0017] 1. The present utility model realizes the liquid level detection at the front and rear ends of the flow pan. The first liquid level monitoring module and the second liquid level monitoring module adopt non-contact liquid level sensors, which are not affected by the environment and have high detection accuracy.

[0018] 2. The PLC controller of the present utility model controls the tilting of the stationary furnace. The PLC controller compares the liquid levels before and after the flow pan. The PLC controller judges the front and rear height differences of the liquid level in the flow pan through comparison, and then the PLC controller controls the tilting of the stationary furnace to avoid the occurrence of the situation that the molten aluminum breaks off due to too large a height difference.

[0019] If the PLC controller judges that the liquid level in the flow pan suddenly rises before and after, the PLC controller controls the stationary furnace to stop tilting to avoid the overflow of the molten aluminum.

[0020] 3. The present utility model is provided with a heat dissipation mechanism. The heat dissipation mechanism is electrically connected to the PLC controller, and the heat dissipation mechanism dissipates heat from the second liquid level monitoring module. Ensure the normal operation of the second liquid level monitoring module in a high-temperature environment. Description of the Drawings

[0021] Figure 1 This is a schematic structural diagram of an automatic liquid level control device of the present utility model;

[0022] Figure 2 This is a circuit diagram of an automatic liquid level control device of the present utility model.

[0023] Reference numerals in the drawings: 1 is a PLC controller, 2 is a pouring pan, 3 is a first liquid level monitoring module, 4 is a second liquid level monitoring module, 5 is a laser ranging sensor, 6 is a housing, 7 is a bracket, 8 is an exhaust fan, and 9 is a relay. Detailed Embodiment

[0024] The present utility model will be further described below in conjunction with the drawings and specific embodiments:

[0025] Embodiment 1

[0026] As Figures 1-2 shown, an automatic liquid level control device includes a stationary furnace, a filter box, a degassing box, and a pouring pan 2. The stationary furnace is provided with a PLC controller 1, and there is molten aluminum in the stationary furnace. The molten aluminum enters the pouring pan 2 through the filter box and the degassing box. A first liquid level monitoring module 3 is provided in the rear flow groove of the pouring pan 2. The first liquid level monitoring module 3 is used to detect the liquid level of the rear flow groove of the pouring pan 2. A second liquid level monitoring module 4 is provided above the front flow groove of the pouring pan 2. Both the first liquid level monitoring module 3 and the second liquid level monitoring module 4 include non-contact liquid level sensors, and the output ends of the non-contact liquid level sensors are connected to the input end of the PLC controller 1;

[0027] The second liquid level monitoring module 4 is provided with an installation mechanism, and a heat dissipation mechanism is provided on the installation mechanism. The heat dissipation mechanism is electrically connected to the PLC controller 1.

[0028] The non-contact liquid level sensor includes a laser ranging sensor 5. The probe of the laser ranging sensor 5 faces downward and is perpendicular to the pouring pan 2.

[0029] The installation mechanism includes a housing 6 and a bracket 7. The housing 6 is a box structure with a hollow interior and an open side. A detection hole is provided at the bottom of the housing 6, and a box door is hinged at the open end of the housing 6;

[0030] A square installation hole is provided on the housing 6, and the heat dissipation mechanism is fixedly arranged at the position of the installation hole.

[0031] The bracket 7 is a T-shaped structure. The housing 6 is arranged on the horizontal section of the bracket 7. The horizontal section of the bracket 7 is fixed to the housing 6 by bolts, and the vertical section of the bracket 7 is fixed to the ground.

[0032] The heat dissipation mechanism includes an exhaust fan 8, and a relay 9 is arranged between the exhaust fan 8 and the PLC controller 1. The coil of the relay 9 is connected to the output end of the PLC controller 1, and the normally open contact of the relay 9 is connected to the exhaust fan 8. The exhaust fan 8 forms a loop by connecting to the power supply through the normally open contact of the relay 9.

[0033] During operation, the PLC controller 1 controls the tilting of the holding furnace to send the molten aluminum in the holding furnace into the filter box, degassing box, tube filtration or deep bed filtration and then into the runner plate 2. At this time, the second liquid level monitoring module 4 above the front runner of the runner plate 2 detects the liquid level at this position, and the laser ranging sensor 5 completes the liquid level detection and sends the detection parameters to the PLC controller 1. The molten aluminum continuously enters the runner plate 2 and flows in the runner plate 2. The first liquid level monitoring module 3 detects the liquid level at the position of the rear runner, and the laser ranging sensor 5 completes the liquid level detection and sends the detection parameters to the PLC controller 1.

[0034] The PLC controller 1 compares the detection parameters of the second liquid level monitoring module 4 and the detection parameters of the first liquid level monitoring module 3, that is, compares the liquid levels before and after the runner plate, and obtains the liquid level difference before and after in the runner plate 2. A liquid level difference threshold before and after is set in the PLC controller 1. The PLC controller 1 compares the liquid level difference before and after in the runner plate 2 with the liquid level difference threshold before and after, and the PLC controller 1 controls the tilting amplitude of the holding furnace to increase to avoid the occurrence of the situation that the molten aluminum flow is interrupted due to too large a difference.

[0035] The PLC controller 1 is provided with a sampling interval. The PLC controller 1 compares the detection parameters of the second liquid level monitoring module 4 for two consecutive times, and the PLC controller 1 also compares the detection parameters of the first liquid level monitoring module 3 for two consecutive times. If the PLC controller 1 judges that the liquid level difference for two consecutive times is large, it indicates that the liquid level in the runner plate 2 suddenly rises before and after, and the PLC controller 1 controls the holding furnace to stop tilting to avoid the overflow of molten aluminum.

[0036] The above-described embodiments are only the preferred embodiments of the present invention and do not limit the scope of implementation of the present invention. Therefore, all equivalent changes or modifications made according to the structure, features and principles described in the scope of the present invention patent should be included in the scope of the patent application of the present invention.

Claims

1. An automatic liquid level control device, comprising a stationary furnace, a filtration tank, a degassing tank and a pouring ladle (2). The stationary furnace is provided with a PLC controller (1). There is molten aluminum in the stationary furnace. The molten aluminum enters the pouring ladle (2) through the filtration tank and the degassing tank. A first liquid level monitoring module (3) is arranged in the rear flow groove of the pouring ladle (2). The first liquid level monitoring module (3) is used for detecting the liquid level of the rear flow groove of the pouring ladle (2), and is characterized in that, A second liquid level monitoring module (4) is arranged above the front flow channel of the flow tray (2). Both the first liquid level monitoring module (3) and the second liquid level monitoring module (4) include non-contact liquid level sensors, and the output ends of the non-contact liquid level sensors are connected to the input end of the PLC controller (1); The second liquid level monitoring module (4) is provided with a mounting mechanism, and a heat dissipation mechanism is arranged on the mounting mechanism. The heat dissipation mechanism is electrically connected to the PLC controller (1).

2. The automatic liquid level control device according to claim 1, characterized in that, The non-contact liquid level sensor includes a laser ranging sensor (5). The probe of the laser ranging sensor (5) faces downward and is perpendicular to the flow tray (2).

3. An automatic liquid level control device according to claim 1, characterized in that, The mounting mechanism includes a housing (6) and a bracket (7). The housing (6) is a box structure with a hollow interior and an open side. A detection hole is arranged at the bottom of the housing (6), and a box door is hinged at the open end of the housing (6); A square mounting hole is formed in the housing (6), and the heat dissipation mechanism is fixedly arranged at the position of the mounting hole.

4. An automatic liquid level control device according to claim 3, characterized in that, The bracket (7) is of a T-shaped structure. The housing (6) is arranged on the horizontal section of the bracket (7). The horizontal section of the bracket (7) is fixed to the housing (6) by bolts, and the vertical section of the bracket (7) is fixed to the ground.

5. An automatic liquid level control device according to claim 3, characterized in that The heat dissipation mechanism includes an exhaust fan (8). A relay (9) is arranged between the exhaust fan (8) and the PLC controller (1). The coil of the relay (9) is connected to the output end of the PLC controller (1), the normally open contact of the relay (9) is connected to the exhaust fan (8), and the exhaust fan (8) forms a loop by connecting to the power supply through the normally open contact of the relay (9).

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