Hydrogen detection ventilation system for aluminum or aluminum alloy casting workshop

Abstract

The utility model provides a hydrogen detection ventilation system for an aluminum or aluminum alloy casting workshop, which belongs to the technical field of aluminum alloy casting and comprises an exhaust pipeline mounted on a roof of the workshop, an exhaust fan is mounted on the exhaust pipeline, a hydrogen detection sensor is further mounted on the exhaust pipeline and is in communication connection with a control box, and the control box is in communication connection with the exhaust fan. A hydrogen detector in communication connection with the hydrogen detection sensor is installed in the control box, a PLC in communication connection with the hydrogen detector is fixedly installed on one side of the hydrogen detector of the control box, and the PLC is in communication connection with the exhaust fan and an external upper computer. The hydrogen concentration is detected and analyzed through cooperation of the hydrogen detection sensor and the hydrogen detector, then the PLC adjusts the frequency of the exhaust fan according to the analysis result, variable-frequency control over the exhaust power according to the hydrogen concentration is achieved, it can be guaranteed that hydrogen is exhausted in time, and energy consumption can be reduced.

Description

Technical Field

[0001] This utility model belongs to the field of aluminum alloy casting technology, and in particular relates to a hydrogen detection and ventilation system for aluminum or aluminum alloy casting workshops. Background Technology

[0002] The casting of aluminum or aluminum alloys involves heating raw metal to a molten state and then casting it into the desired shape. During the casting process, water cooling is often used to control temperature and improve production efficiency. However, when molten aluminum comes into contact with water, a reaction occurs, producing hydrogen gas and aluminum oxide. If this hydrogen gas is not removed promptly, it will accumulate in the workshop and gradually reach explosive concentrations, posing a safety hazard.

[0003] Therefore, casting workshops need to maintain good ventilation to reduce hydrogen concentration and ensure a safe production environment, hence the installation of ventilation systems. However, most current casting workshop ventilation systems are fixed-frequency controlled and do not adjust their power according to hydrogen concentration, resulting in energy waste and increased production costs. Summary of the Invention

[0004] Based on the aforementioned problems in the existing technology, this utility model provides a hydrogen detection ventilation system for aluminum or aluminum alloy casting workshops, including an exhaust pipe installed on the workshop roof, an exhaust fan installed on the exhaust pipe, a hydrogen detection sensor installed on the exhaust pipe, the hydrogen detection sensor being communicatively connected to a control box, a hydrogen detector being installed in the control box and communicatively connected to the hydrogen detection sensor, and a PLC controller being fixedly installed on one side of the control box and communicatively connected to the hydrogen detector, the PLC controller being communicatively connected to the exhaust fan and an external host computer.

[0005] The control box also contains a touch control screen that communicates with the PLC controller.

[0006] The exhaust pipe is connected to the workshop at one end and to the small diameter end of the first reducing pipe at the other end. The large diameter end of the first reducing pipe is connected to a soft canvas pipe, which is then connected to the large diameter end of the second reducing pipe. The small diameter end of the second reducing pipe is then connected to the exhaust fan.

[0007] The soft canvas tube includes two connecting rings and a canvas section connecting the two connecting rings. The diameters of the two connecting rings are respectively matched with the large diameter ends of the first and second reducing pipes, and are respectively connected to the large diameter ends of the corresponding reducing pipes.

[0008] The exhaust fan includes an exhaust turbine connected to the smaller diameter end of the second reducing pipe. The exhaust turbine is driven by a gearbox, which in turn is connected to a drive motor.

[0009] The top of the exhaust pipeline is provided with a mounting ring column, the upper outer side of the mounting ring column is provided with a connecting thread, the hydrogen detection sensor is provided with a connecting ring cover, the inner side of the connecting ring cover is mounted to the upper outer side of the mounting ring column through the connecting thread, the center of one side of the connecting ring cover is fixedly provided with a sensor main body, the sensor main body penetrates the mounting ring column and extends into the exhaust pipeline, and the other side of the connecting ring cover is provided with a communication line.

[0010] The upper inner side of the mounting ring column is provided with a slanting pressing surface which is gradually reduced in diameter downwards, a sealing rubber ring is mounted between the sensor main body and the connecting ring cover, the inner side of the sealing rubber ring is provided with a slanting pressing part which is in pressing contact with the slanting pressing surface, the peripheral side of the slanting pressing part is provided with a flat pressing part which extends outwards, the flat pressing part is in pressing contact with the upper surface of the mounting ring column, and the outer side of the flat pressing part is in clearance fit with the inner side of the connecting ring cover.

[0011] The inner side of the sealing rubber ring is in interference fit with the outer side of the sensor main body.

[0012] The hydrogen detection sensor is mounted on the exhaust pipeline, the hydrogen detection sensor is in communication connection with the hydrogen detector and the PLC controller, the hydrogen concentration is detected and analyzed through cooperation of the hydrogen detection sensor and the hydrogen detector, then the PLC controller adjusts the frequency of the exhaust fan according to the analysis result, frequency conversion control of the exhaust power is realized according to the hydrogen concentration, timely exhaust of hydrogen can be ensured, and the energy consumption can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a three-dimensional structure schematic view of a hydrogen detection ventilation system for an aluminum or aluminum alloy melting and casting workshop.

[0014] Figure 2 It is a three-dimensional structure schematic view of a hydrogen detection ventilation system for an aluminum or aluminum alloy melting and casting workshop.

[0015] Figure 3 It is a plane connection schematic view of a hydrogen detection ventilation system for an aluminum or aluminum alloy melting and casting workshop.

[0016] Figure 4 It is a communication connection schematic view in the control box.

[0017] Figure 5 It is a three-dimensional structure schematic view of a first reducing pipe, a second reducing pipe and a soft canvas pipe.

[0018] Figure 6 It is a plane structure schematic view of a first reducing pipe, a second reducing pipe and a soft canvas pipe.

[0019] Figure 7 It is Figure 6A magnified view of point A.

[0020] Figure 8 This is a diagram illustrating the disassembly of the hydrogen detection sensor.

[0021] Figure 9 This is a cross-sectional structural diagram of the hydrogen detection sensor and the mounting ring.

[0022] Figure 10 yes Figure 9 Enlarged view of point B. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0024] As attached Figures 1-10 The diagram illustrates a hydrogen detection ventilation system for an aluminum or aluminum alloy smelting and casting workshop. It includes an exhaust pipe 1 installed on the workshop roof, composed of multiple pipe sections, including an intake pipe 2 leading into the workshop. The intake pipe 2 is connected to a 90° bend 3, which in turn connects to a main exhaust pipe 4. At the other end of the main exhaust pipe 4, opposite the bend 3, is a first reducer 5 with a smaller diameter end. The larger diameter end of the first reducer 5 is connected to a flexible canvas pipe 6, which is then connected to the larger diameter end of a second reducer 7. The smaller diameter end of the second reducer 7 is connected to an exhaust fan 8. The exhaust fan 8 includes an exhaust turbine 9 connected to the smaller diameter end of the second reducer 7. The exhaust turbine 9 is driven by a gearbox 10. The other end of 10 is connected to the drive motor 11 via a transmission gear and a transmission belt. The soft canvas tube 6 can compensate for slight misalignment at both ends of the exhaust pipe 1 caused by installation and production errors by using a soft connection, thereby improving the fault tolerance of the equipment. The soft canvas tube 6 includes two connecting rings 12 and a canvas section 13 connecting the two connecting rings 12. The diameters of the two connecting rings 12 are respectively matched with the large diameter ends of the first reducing pipe 5 and the second reducing pipe 7, and are respectively connected to the large diameter ends of the corresponding reducing pipes. Reducing pipes are provided at both ends of the soft canvas tube 6, so that the diameter of the soft canvas tube 6 is larger than the diameter of the pipes on both sides, thereby slowing down the air flow and air pressure in the soft canvas tube 6, reducing the wear of the soft canvas tube 6, and improving the service life and stability of the equipment. The second reducing pipe 7 and the exhaust turbine 9 are mounted on a protective frame 14. The protective frame 14 covers the exhaust turbine 9 to prevent it from colliding with external objects during rotation and causing damage or safety accidents. A mounting bracket 15 is also fixedly installed at the bottom of the protective frame 14. The gearbox 10 and the drive motor 11 are both fixedly installed on the mounting bracket 15.

[0025] The exhaust pipe 1 is also provided with a hydrogen detection sensor 16 on the top of the main exhaust pipe 4 near one end of the elbow pipe 3, which is connected to a control box 17 through a signal line, and the control box 17 is provided with a hydrogen detector 18 connected to the hydrogen detection sensor 16, and the hydrogen detection response time of the hydrogen detector 18 is 6-10 seconds, and the control box 17 is fixedly provided with a PLC controller 19 connected to the hydrogen detector 18 on one side of the hydrogen detector 18, which is a Siemens s7-200 SMART controller connected to the hydrogen detector 18 through an RS485 communication line, and the PLC controller 19 is also connected to the exhaust fan 8, an external upper computer and a touch control screen 20 fixedly installed on the control box 17, which is used to display the current hydrogen concentration and set the hydrogen concentration alarm value.

[0026] As a preferred embodiment, the top of the exhaust pipe 1 is provided with a mounting ring column 21, and the outer side of the upper part of the mounting ring column 21 is provided with a connecting thread, and the hydrogen detection sensor 16 is provided with a connecting ring cover 22, and the inner side of the connecting ring cover 22 is connected to the outer side of the upper part of the mounting ring column 21 through the connecting thread, and the center of one side of the connecting ring cover 22 is fixedly provided with a sensor body 23, and the sensor body 23 penetrates into the exhaust pipe 1 through the mounting ring column 21, and the other side of the connecting ring cover 22 is provided with a communication line. The upper inner side of the mounting ring column 21 is provided with a beveled surface 24 which gradually reduces in diameter downward, a sealing rubber ring 25 is installed between the sensor body 23 and the connecting ring cover 22, the inner side of the sealing rubber ring 25 is in interference fit with the outer side of the sensor body 23, the inner side of the sealing rubber ring 25 is provided with a beveled part 26 which is in compressive contact with the beveled surface 24, and the outer side of the sealing rubber ring 25 is provided with a flat part 27 which extends outwardly, and the flat part 27 is in compressive contact with the upper surface of the mounting ring column 21, and during the installation of the hydrogen detection sensor 16 to the mounting ring column 21, the sealing rubber ring 25 is continuously extruded by the screwing, which can improve the connection sealing between the hydrogen detection sensor 16 and the mounting ring column 21, avoid the leakage at the installation position, and affect the detection result, and the beveled part 26 and the flat part 27 of the sealing rubber ring 25 can improve the extrusion contact area and the sealing performance.

[0027] The ventilation system provided by the embodiment can detect the hydrogen concentration in the exhaust pipeline 1 in real time, and then adjust the power of the exhaust fan 8 according to the hydrogen concentration, so that the power of the exhaust fan 8 is increased when the hydrogen concentration is high, the hydrogen is discharged at a high speed, the power of the exhaust fan 8 is reduced when the hydrogen concentration is low, and the energy consumption is reduced. When it is detected that the hydrogen concentration exceeds the preset safety value, a signal can be sent to the alarm system to start the alarm system to alarm.

[0028] The above embodiment only expresses one embodiment of the utility model, the description is more specific and detailed, but it cannot be understood as the limitation of the utility model patent range. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which belong to the protection range of the utility model. Therefore, the protection range of the utility model patent should be subject to the appended claims.

Claims

1. A hydrogen detection ventilation system for an aluminum or aluminum alloy foundry plant, comprising an exhaust duct (1) installed to the roof of the plant house, an exhaust fan (8) installed to the exhaust duct (1), characterized in that, The exhaust pipe (1) is further provided with a hydrogen detection sensor (16) which is in communication connection with a control box (17), the control box (17) is internally provided with a hydrogen detector (18) which is in communication connection with the hydrogen detection sensor (16), and the control box (17) is fixedly provided with a PLC controller (19) which is in communication connection with the hydrogen detector (18) on one side of the hydrogen detector (18), and the PLC controller (19) is in communication connection with an exhaust fan (8) and an external host computer.

2. A hydrogen detection ventilation system for an aluminum or aluminum alloy melting and casting plant according to claim 1, characterized in that, The control box (17) is further fixedly provided with a touch control screen (20) which is in communication connection with the PLC controller (19).

3. A hydrogen detection ventilation system for an aluminum or aluminum alloy melting plant according to claim 2, characterized in that, One end of the exhaust pipe (1) is communicated with a workshop, and the other end of the exhaust pipe (1) is connected with a small-diameter end of a first reducing pipe (5), the large-diameter end of the first reducing pipe (5) is connected with a soft canvas pipe (6), the large-diameter end of the second reducing pipe (7) is further connected to the exhaust fan (8).

4. A hydrogen detection and ventilation system for an aluminum or aluminum alloy melting plant according to claim 3, characterized in that, The soft canvas pipe (6) comprises two connecting rings (12) and a canvas section (13) connecting the two connecting rings (12), the diameters of the two connecting rings (12) are matched with the large-diameter ends of the first reducing pipe (5) and the second reducing pipe (7) respectively, and the two connecting rings (12) are connected with the large-diameter ends of the corresponding reducing pipes respectively.

5. A hydrogen detection and ventilation system for an aluminum or aluminum alloy melting plant as defined in claim 3, wherein The exhaust fan (8) comprises an exhaust turbine (9) which is connected with the small-diameter end of the second reducing pipe (7), the exhaust turbine (9) is in transmission connection with a gear box (10), and the gear box (10) is further in transmission connection with a driving motor (11).

6. A hydrogen detection and ventilation system for an aluminum or aluminum alloy melting plant according to any one of claims 1-5, characterized in that, The top of the exhaust pipe (1) is provided with a mounting ring column (21), the upper outer side of the mounting ring column (21) is provided with connecting threads, the hydrogen detection sensor (16) is provided with a connecting ring cover (22), the inner side of the connecting ring cover (22) is mounted to the upper outer side of the mounting ring column (21) through the connecting threads, the center of one side of the connecting ring cover (22) is fixedly provided with a sensor main body (23), the sensor main body (23) penetrates through the mounting ring column (21) and extends into the exhaust pipe (1), and the other side of the connecting ring cover (22) is provided with a communication line.

7. A hydrogen detection and ventilation system for an aluminum or aluminum alloy melting plant according to claim 6, characterized in that, The upper inner side of the mounting ring column (21) is provided with a tapered surface (24) which is gradually reduced in diameter downward, a sealing rubber ring (25) is mounted between the sensor main body (23) and the connecting ring cover (22), the inner side of the sealing rubber ring (25) is provided with a tapered portion (26) which is in compressive contact with the tapered surface (24), the outer side of the sealing rubber ring (25) is provided with a flat portion (27) which extends outward on the circumferential side of the tapered portion (26), the flat portion (27) is in compressive contact with the upper surface of the mounting ring column (21), and the outer side of the flat portion (27) is in clearance fit with the inner side of the connecting ring cover (22).

8. A hydrogen detection and ventilation system for an aluminum or aluminum alloy melting plant according to claim 7, characterized in that, The inner side of the sealing rubber ring (25) is in interference fit with the outer side of the sensor main body (23).

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