Liquid crystal glass kiln flue gas pressure measuring device

Abstract

The utility model discloses a liquid crystal glass kiln flue gas pressure measuring device which is used for detecting and controlling the gas pressure in a kiln flue, a fan extracts redundant gas in the kiln flue through an exhaust pipe, and a pressure transmitter is communicated with the exhaust pipe through a pressure taking pipe so as to detect the gas pressure in the kiln flue in real time. The control assembly is electrically connected with the draught fan and the pressure transmitter so that when the pressure transmitter detects that the air pressure is lower than a preset threshold value, the draught fan can be controlled to stop working, micro-positive pressure of the kiln is guaranteed, and automatic control over the air pressure of the flue of the kiln is achieved. And the air pressure is controlled in real time, so that the suction force of the flue is stable, micro-positive pressure is kept in the kiln, and normal and stable production is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of liquid crystal glass production, and relates to an air pressure measuring device, in particular to an air pressure measuring device for a liquid crystal glass kiln flue. Background Art

[0002] In the production of TFT liquid crystal glass, after the glass is melted, it is necessary to ensure a slight positive pressure in the kiln according to the process requirements. Therefore, when using a fan to extract excess gas from the kiln, it is necessary to detect the suction force to ensure the slight positive pressure of the kiln. The traditional method mainly relies on manual measurement, which brings great trouble and uncertainty to process control. In addition, manual measurement cannot guarantee that the benchmark is the same every time. There are many human factors, no comparability, and relatively large errors. It is impossible to determine the actual change of the furnace pressure and cannot meet the normal process production requirements. Utility Model Content

[0003] In order to solve the technical problems existing in the background technology, the utility model proposes a liquid crystal glass kiln flue air pressure measuring device, which can accurately, effectively and conveniently measure the air pressure in the kiln flue, and control the air pressure in real time to ensure the stability of the flue suction force, so that a slight positive pressure is maintained in the kiln to achieve normal and stable production.

[0004] The purpose of the utility model can be achieved through the following technical solutions:

[0005] A liquid crystal glass kiln flue gas pressure measuring device comprises a fan, a pressure transmitter and a control component. The fan is connected to the flue of the kiln through an exhaust pipe to extract the gas in the kiln. The pressure transmitter is connected to the exhaust pipe through a pressure taking pipe to detect the air pressure information in the exhaust pipe in real time.

[0006] Furthermore, it also includes a filter assembly installed in the exhaust pipe, which is arranged between the flue and the pressure-taking pipe, so that the gas entering the exhaust pipe from the flue is filtered by the filter assembly before entering the pressure-taking pipe.

[0007] Furthermore, the filter assembly includes a filter screen, two relatively arranged guide rods, and two metal sliders slidably connected to the two guide rods. The two metal sliders are respectively fixedly connected to the two ends of the filter screen. One end of the guide rod is fixedly connected to the pipe wall of the exhaust pipe through an electromagnet, and the other end is provided with a limit block.

[0008] Furthermore, a spring is sleeved on the guide rod, one end of the spring is connected to the electromagnet, and the other end of the spring is connected to the metal slider.

[0009] Furthermore, a cross bar is connected between the two electromagnets, and one or more top blocks are arranged under the cross bar.

[0010] Furthermore, a scraper is provided on the outer side of the two metal sliders, one end of the scraper is connected to the metal slider, and the other end is slidably connected to the pipe wall of the exhaust pipe.

[0011] Furthermore, it also includes a control component electrically connected to the fan and the pressure transmitter respectively, so that when the air pressure detected by the pressure transmitter is lower than a preset threshold, the fan is controlled to stop working. The control component includes a distributor, an analog-to-digital conversion module, a display module and a control chip. The distributor is electrically connected to the fan and the pressure transmitter respectively, the analog-to-digital conversion module is connected to the distributor, and the display module and the control chip are both connected to the analog-to-digital conversion module.

[0012] Furthermore, the fan, the pressure transmitter and the distributor are all connected by high temperature resistant shielded cables.

[0013] Beneficial effects of the utility model: the liquid crystal glass kiln flue air pressure monitoring device provided by the utility model is used to detect and control the air pressure in the kiln flue, the fan extracts the excess gas in the kiln flue through the exhaust pipe, the pressure transmitter is connected with the exhaust pipe through the pressure taking pipe to detect the air pressure in the kiln flue in real time, the control component is electrically connected to the fan and the pressure transmitter respectively, so that when the air pressure detected by the pressure transmitter is lower than the preset threshold value, the fan is controlled to stop working to ensure the micro positive pressure of the kiln and realize automatic control of the kiln flue air pressure. The utility model can accurately, effectively and conveniently measure the air pressure in the kiln flue, and control the air pressure in real time to ensure the stability of the flue suction force, so that the kiln maintains a micro positive pressure to realize normal and stable production. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model.

[0015] Figure 2 for Figure 1 A local enlarged schematic diagram of point A in the middle.

[0016] Figure 3 It is a schematic diagram of the control component in the utility model. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] like Figure 1As shown, the utility model provides a liquid crystal glass kiln flue gas pressure measuring device, including a fan 1, a pressure transmitter 2, and a control component. The fan 1 is connected to the kiln flue 5 through an exhaust pipe 4 to extract excess gas in the kiln to meet the process requirements. The pressure transmitter 2 is connected to the exhaust pipe 4 through a pressure taking pipe 6 to detect the air pressure information in the exhaust pipe 4 in real time. Since the exhaust pipe 4 and the kiln flue 5 are interconnected, the air pressure in the exhaust pipe 4 is the air pressure in the kiln flue 5 at this time. The control component is electrically connected to the fan 1 and the pressure transmitter 2 respectively, so that when the air pressure detected by the pressure transmitter 2 is lower than a preset threshold value, the fan 1 is controlled to stop working to ensure a micro-positive pressure in the kiln, thereby realizing automatic control of the kiln flue gas pressure. A filter assembly 7 is installed in the exhaust pipe 4, and the filter assembly 7 is arranged between the flue 5 and the pressure taking pipe 6, so that the gas entering the exhaust pipe 4 from the flue 5 is filtered by the filter assembly 3 before entering the pressure taking pipe 6, thereby preventing smoke and dust in the gas from entering the pressure taking pipe 6 and causing blockage of the pressure taking pipe 6.

[0019] like Figure 2 As shown, the filter assembly 7 includes a filter screen 71, two relatively arranged guide rods 72, and two metal sliders 73 slidably connected to the two guide rods 72. The two metal sliders 73 are respectively fixedly connected to the two ends of the filter screen 71. One end of the guide rod 72 is fixedly connected to the pipe wall of the exhaust pipe 4 through an electromagnet 74, and the other end is provided with a limit block 75, so that the filter screen 71 can slide back and forth between the electromagnet 74 and the limit block 75 along the axial direction of the guide rod 72 through the two metal sliders 73. During specific use, the gas entering the exhaust pipe 4 through the flue 5 is filtered through the filter 71 to filter out the smoke and dust in the gas. After long-term use, the filter 71 is easily blocked by the smoke and dust attached to it. At this time, by energizing the two electromagnets 74, the two metal sliders 73 respectively drive the filter 71 to move upward along the guide rod 72 under the magnetic attraction of the two electromagnets 74, and then by de-energizing the two electromagnets 74, the filter 71 moves downward along the guide rod 72 under the action of gravity. Therefore, by controlling the on and off of the electromagnet 74, the filter 71 can be moved up and down along the guide rod 72 to shake off the smoke and dust attached to the filter 71, thereby ensuring the smooth flow of the filter 71.

[0020] A spring 76 is sleeved on the guide rod 72, one end of the spring 76 is connected to the electromagnet 74, and the other end is connected to the metal slider 73. Therefore, when the two electromagnets 74 are energized to drive the filter 71 to move axially upward along the guide rod 72, the two metal sliders 73 compress the two springs 76 respectively. When the springs 76 are compressed to the limit, the two electromagnets 74 are powered off. The two metal sliders 73 drive the filter 71 to vibrate up and down along the axial direction of the guide rod 72 under the rebound action of the two springs 76, and the smoke and dust attached to the filter 71 are shaken off. Therefore, the vibration of the filter 71 can be achieved without repeatedly controlling the on and off of the electromagnet 74, which is convenient and stable.

[0021] A cross bar 77 is connected between the two electromagnets 74, and one or more top blocks 78 are provided below the cross bar 77 to impact the middle of the filter 71 when the filter 71 moves axially upward along the guide rod 72, thereby further shaking off the smoke and dust attached to the filter 71.

[0022] A scraper 79 is provided on the outside of the two metal sliders 73. One end of the scraper 79 is connected to the metal slider 73, and the other end is slidably connected to the wall of the exhaust pipe 4, so as to remove smoke and dust attached to the wall of the exhaust pipe 4 during the axial movement of the filter screen 71 along the guide rod 72.

[0023] like Figure 3 As shown, the control component includes a distributor, an analog-to-digital conversion module, a display module and a control chip. The distributor is electrically connected to the fan 1 and the pressure transmitter 2 respectively, the analog-to-digital conversion module is connected to the distributor, and the display module and the control chip are both connected to the analog-to-digital conversion module. The fan 1, pressure transmitter 2 and the distributor are connected by high temperature resistant shielded cables. The distributor provides a DC 24V power supply to the fan 1 and pressure transmitter 2. The pressure transmitter 2 converts the measured air pressure data into a 4-20mA current signal and transmits it to the distributor, which then isolates and outputs it to the analog-to-digital conversion module. The analog-to-digital conversion module calculates and converts the current signal into pressure data and transmits it to the display module and the control chip to realize online detection of the kiln flue gas pressure. The range of the pressure transmitter 2 is determined according to the design requirements. For example, the range of the pressure transmitter 2 is -300---0Pa, -300Pa corresponds to 4mA, 0Pa corresponds to 20mA, then -1Pa is 18.75mA, if the current value received by the analog-to-digital conversion module is 12mA, then the air pressure data in the flue 5 is -150Pa. The control chip compares the air pressure data measured by the pressure transmitter 2 with the preset air pressure threshold. If the air pressure data measured by the pressure transmitter 2 is lower than the preset air pressure threshold, the control distributor stops supplying power to the fan 1, so that the fan 1 stops working, ensuring the micro positive pressure of the kiln and realizing automatic control of the kiln flue air pressure.

[0024] The above contents are merely examples and explanations of the structure of the utility model. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of the utility model.

Claims

1. A liquid crystal glass furnace flue gas pressure measuring device, characterized in that: The invention comprises a fan (1) and a pressure transmitter (2). The fan (1) is connected to a flue (5) of a kiln through an exhaust pipe (4), and the pressure transmitter (2) is connected to the exhaust pipe (4) through a pressure-taking pipe (6).

2. The flue gas pressure measuring device according to claim 1, characterized in that: It also includes a filter assembly (7) installed in the exhaust pipe (4), and the filter assembly (7) is arranged between the flue (5) and the pressure-taking pipe (6).

3. The flue gas pressure measuring device according to claim 2, characterized in that: The filter assembly (7) comprises a filter screen (71), two guide rods (72) arranged opposite to each other, and two metal sliders (73) slidably connected to the two guide rods (72). The two metal sliders (73) are respectively fixedly connected to the two ends of the filter screen (71). One end of the guide rod (72) is fixedly connected to the pipe wall of the exhaust pipe (4) through an electromagnet (74), and the other end is provided with a limit block (75).

4. The flue gas pressure measuring device according to claim 3, characterized in that: A spring (76) is sleeved on the guide rod (72), one end of the spring (76) is connected to the electromagnet (74), and the other end of the spring (76) is connected to the metal slide block (73).

5. The flue gas pressure measuring device according to claim 3, characterized in that: A crossbar (77) is connected between the two electromagnets (74), and one or more top blocks (78) are arranged below the crossbar (77).

6. The flue gas pressure measuring device according to claim 3, characterized in that: A scraper (79) is provided on the outside of the two metal sliders (73); one end of the scraper (79) is connected to the metal slider (73), and the other end is slidably connected to the pipe wall of the exhaust pipe (4).

7. The flue gas pressure measuring device according to claim 1, characterized in that: It also includes a distributor, an analog-to-digital conversion module, a display module and a control chip. The distributor is electrically connected to the fan (1) and the pressure transmitter (2) respectively, the analog-to-digital conversion module is connected to the distributor, and the display module and the control chip are both connected to the analog-to-digital conversion module.

8. The flue gas pressure measuring device according to claim 7, characterized in that: The fan (1), the pressure transmitter (2) and the distributor are all connected by high temperature resistant shielded cables.

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