Sensor module for detecting water level of potassium nitrate in tempering furnace

Abstract

The sensing module for detecting the water level of potassium nitrate in the tempering furnace comprises a water level detecting unit arranged in the interior of the glass tempering furnace and arranged at the height equal to the water level line of the tempering solution to be filled into the tempering furnace, and generates an electrical signal above or below a preset critical value when in contact with the tempering solution to detect whether the tempering solution filled into the tempering furnace has reached the preset water level line of the tempering solution. The sensing module for detecting the water level of potassium nitrate in the tempering furnace of the present application can automatically identify whether the molten liquid state potassium nitrate in the tempering furnace has reached the preset water level line of the tempering furnace.

Description

Technical Field

[0001] This invention relates to a sensing module for detecting potassium nitrate level in a tempering furnace, specifically to a sensing module for detecting potassium nitrate level in a tempering furnace that can automatically detect whether the liquid state of potassium nitrate, which is used as a glass tempering solution, has reached a preset water level line in the tempering furnace. Background Technology

[0002] Generally, glass tempering is divided into physical tempering and chemical tempering.

[0003] Physical tempering is a method of enhancing the internal strength of glass by heating it to a temperature between 550°C and 700°C and then rapidly cooling it. It is mainly used in the production of tempered glass and automotive glass.

[0004] However, physical tempering is not suitable for thin glass sheets where there is not a sufficient temperature difference between the surface layer and the central layer. Tempering cannot be achieved in the case of glass with a small coefficient of thermal expansion, and there is a disadvantage of uneven temperature difference in the case of glass with complex shapes. Therefore, it needs to be operated at a high temperature (close to the softening temperature), which may lead to deformation.

[0005] On the other hand, the chemical tempering involves immersing thin glass sheets in a tempering furnace containing a potassium nitrate solution at 450°C for more than 3 hours, allowing the sodium ions in the glass to exchange with the potassium ions in the potassium nitrate solution. This method is mainly used for tempering thin glass sheets with a thickness of less than 2.0 mm.

[0006] The chemical tempering method first heats the glass to be tempered at a temperature below the transition temperature range of 300°C to 450°C, while simultaneously melting potassium nitrate at a temperature above 380°C. The heated glass is then immersed in the molten salt and held for a predetermined time to form a compressive stress layer on the glass surface, thereby achieving tempering.

[0007] On the other hand, an ultrasonic sensor or a floating sensor can be used to check the water level of liquefied potassium nitrate in the tempering furnace. However, the ultrasonic sensor cannot be used at temperatures above 200 degrees Celsius, and the floating sensor cannot measure the water level because the potassium nitrate cannot float.

[0008] On the other hand, prior art of this invention is disclosed in patent application number 10-2003-0081035, which discloses a multi-segment water level sensor. The multi-segment water level sensor is used to detect the water level in a water tank and output the detection signal to a water supply device. It includes a body combined with the water tank, a plurality of electrode rods of different lengths extending downward from the lower surface of the body, an insulator disposed in a surrounding manner on the upper part of the electrode rods as a part connected to the lower surface of the body, a comparator, and a signal output part. The comparator is used to receive and compare the capacitance values ​​of the electrode rods and the water in the water tank. The signal output part has a signal section for receiving the signal from the comparator and outputting a signal indicating which of the plurality of electrode rods the water has contacted. The longest of the electrode rods is grounded, and the signal section is built into the body.

[0009] Content of the invention

[0010] The technical problem that the invention aims to solve

[0011] To address the problems described above, the present invention provides a sensing module for detecting the potassium nitrate level in a tempering furnace, capable of automatically identifying whether the molten liquid potassium nitrate in the tempering furnace has reached the preset water level line of the tempering furnace.

[0012] Furthermore, another object of the present invention is to provide a potassium nitrate level detection module in a tempering furnace that can temper glass with an appropriate amount of potassium nitrate by automatically identifying whether the molten liquid state of potassium nitrate in the tempering furnace has reached the preset water level line of the tempering furnace.

[0013] Furthermore, another objective of the present invention is to provide a sensing module for detecting the potassium nitrate level in a tempering furnace by automatically identifying whether the molten liquid potassium nitrate in the tempering furnace has reached the preset water level line of the tempering furnace, thereby reducing the time and manpower wasted in adjusting the potassium nitrate level in the tempering furnace and realizing the glass tempering process.

[0014] Technical solutions for solving the problem

[0015] To achieve the aforementioned objective, according to a first embodiment, the potassium nitrate level detection sensor module M in the tempering furnace of the present invention includes a level detection unit C, disposed inside the glass tempering furnace F at a height equal to the water level line of the tempering solution to be filled into the tempering furnace F. When in contact with the tempering solution, it generates an electrical signal above or below a preset threshold value to detect whether the tempering solution filled into the tempering furnace F has reached the preset tempering solution water level line. Furthermore, in a first embodiment, the level detection unit C is a temperature sensing module 100 disposed at a height equal to the water level line of the tempering solution to be filled into the tempering furnace F and used for temperature detection. When the temperature detected by the temperature sensing module 100 is 330 degrees or higher, the level detection sensor module M detects whether the tempering solution filled into the tempering furnace F has reached the preset tempering solution water level line. According to the first embodiment, the water level detection sensing module M further includes: a first signal processing unit 101, used to adjust the output voltage range from the temperature sensing module 100 to the input voltage range of the input terminal in the first A / D converter 102; the first A / D converter 102, used to convert the analog voltage output from the first signal processing unit 101 into digital data; a temperature conversion unit 103, used to convert the digital data output from the first A / D converter 102 into the temperature value of the tempering solution; and a water level determination unit 104, which determines that the tempering solution filled into the tempering furnace F has reached the preset tempering solution water level line when the temperature value of the tempering solution converted by the temperature conversion unit 103 is above 330 degrees.

[0016] Furthermore, according to the second embodiment, the potassium nitrate level detection sensor module M in the tempering furnace of the present invention includes a level detection unit C, which is disposed inside the glass tempering furnace F at a height equal to the water level line of the tempering solution to be filled into the tempering furnace F. When in contact with the tempering solution, it generates an electrical signal above or below a preset threshold value to detect whether the tempering solution filled into the tempering furnace F has reached the preset tempering solution water level line. The tempering furnace F is a conductor, and the level detection unit C includes: a level detection measuring rod 200, disposed at a height equal to the water level line of the tempering solution to be filled into the tempering furnace F, and made of a conductor; and a resistance measuring module 201, used to measure the resistance value between the level detection measuring rod 200 and the tempering furnace F. When the resistance value between the water level detection measuring rod 200 and the tempering furnace F, as detected by the resistance measuring module 201, is within the range of 0.1 ohms to 100 ohms, the water level detection sensing module M determines that the tempering solution filled into the tempering furnace F has reached the preset tempering solution water level line. The resistance measurement module 201 includes: a constant current supply unit 202 for supplying a constant current to the water level detection measuring rod 200; a constant current measuring unit 203 for measuring the constant current value input from the constant current supply unit 202 to the water level detection measuring rod 200 in real time; a voltage difference detection unit 204 for measuring the voltage difference between the water level detection measuring rod 200 and the tempering furnace F; and a resistance measuring unit 205 for measuring the resistance value between the water level detection measuring rod 200 and the tempering furnace F using the voltage difference measured by the voltage difference detection unit 204 and the constant current value measured in real time by the constant current measuring unit 203. The voltage measuring unit 204 for voltage difference detection includes: a second signal processing unit 209, which adjusts the voltage difference between the water level measuring rod 200 and the tempering furnace F to the input voltage range of the input terminal of the second A / D converter 210; the second A / D converter 210, which converts the analog voltage output from the second signal processing unit 209 into digital data; and a voltage conversion unit 211, which converts the digital data converted by the second A / D converter 210 into voltage.

[0017] The effects of the invention

[0018] The potassium nitrate level detection sensor module of the present invention, constructed with this structure, can automatically identify whether the potassium nitrate in the molten liquid state of the tempering furnace has reached the preset water level line of the tempering furnace.

[0019] Furthermore, the present invention can temper glass with an appropriate amount of potassium nitrate by automatically identifying whether the molten liquid state of potassium nitrate in the tempering furnace has reached the preset water level line of the tempering furnace.

[0020] Furthermore, this invention can reduce the time and manpower wasted in adjusting the potassium nitrate water level in the tempering furnace and automate the glass tempering process.

[0021] Furthermore, this invention is not affected by the inaccurate sensitivity of traditional tempering solution level detection sensors or the frequent errors of tempering solution level detection sensors. When confirming the level of the tempering solution in the tempering furnace, it can automatically confirm whether the tempering solution in the tempering furnace has reached the preset level without manual confirmation.

[0022] Furthermore, this invention ensures operational stability and improves the mass production of tempered glass by automatically detecting the water level of the tempering solution in the tempering furnace. Attached Figure Description

[0023] Figure 1a This is an attached diagram showing the temperature value measured by the temperature sensing module when the tempering solution has not reached the preset water level.

[0024] Figure 1b This is an attached diagram showing the temperature value measured by the temperature sensor module when the tempering solution has reached the preset water level.

[0025] Figure 2 This is a control block diagram of the first embodiment of the present invention.

[0026] Figure 3a This is a conceptual diagram of the second embodiment of the present invention.

[0027] Figure 3b This is an attached diagram showing the resistance value between the measuring rod used for level detection and the tempering furnace when the tempering solution has not reached the preset water level line.

[0028] Figure 3c This is an attached diagram showing the resistance value between the measuring rod used for level detection and the tempering furnace when the tempering solution has reached the preset water level line.

[0029] Figure 4 This is a control block diagram of the second embodiment of the present invention.

[0030] Figure 5 This is an illustration showing the structural elements of a voltage measuring unit for voltage difference detection.

[0031] Figure 6 The attached diagram shows the voltage difference amplification section and the shift voltage circuit section.

[0032] Explanation of reference numerals in the attached figures

[0033] F: Tempering furnace C: Water level detection unit

[0034] M: Water level detection sensor module; 100: Temperature sensor module

[0035] 101: First signal processing unit; 102: First A / D converter

[0036] 103: Temperature conversion unit; 104: Water level determination unit

[0037] 105: First micro-voltage amplification section; 106: First filtering section

[0038] 107: First zero-point adjustment unit; 108: Real-time temperature storage unit

[0039] 109: Quantity Counting Unit; 110: Average Temperature Value Derivation Unit

[0040] 111: Initialization Unit; 112: Temperature Reference Value Storage Unit

[0041] 113: Temperature Comparison Unit 114: Final Judgment Unit

[0042] 200: Water level measuring rod; 201: Resistance measuring module

[0043] 202: Constant Current Supply Unit; 203: Constant Current Measurement Unit

[0044] 204: Voltage measuring unit for voltage difference detection; 205: Resistance measuring unit

[0045] 206: Shunt resistor for current measurement; 207: Voltage measuring unit for constant current detection.

[0046] 208: Constant Current Calculation Unit; 209: Second Signal Processing Unit

[0047] 210: Second A / D converter; 211: Voltage conversion unit

[0048] 212: Voltage difference amplification section; 213: Shift voltage circuit section

[0049] 214: Second filter section; 215: Potential difference meter circuit section

[0050] 216: First resistor; 217: Output voltage holding circuit section Detailed Implementation

[0051] The present invention will now be described in detail with reference to the accompanying drawings.

[0052] According to such Figure 1a and Figure 1bThe first embodiment shown in the invention includes a potassium nitrate level detection sensor module M in the tempering furnace, comprising a level detection unit C, which is disposed inside the glass tempering furnace F at a height equal to the water level line of the tempering solution to be filled into the tempering furnace F. When in contact with the tempering solution, it generates an electrical signal above or below a preset critical value to detect whether the tempering solution filled into the tempering furnace F has reached the preset tempering solution water level line.

[0053] According to such Figure 1a and Figure 1b In the first embodiment shown, the water level detection unit C is a temperature sensing module 100 set at the same height as the water level line of the tempering solution to be filled into the tempering furnace F and used to detect the temperature. When the temperature detected by the temperature sensing module 100 is above 330 degrees, the water level detection sensing module M detects whether the tempering solution filled into the tempering furnace F has reached the preset tempering solution water level line.

[0054] According to as such Figure 2 In the first embodiment shown, the water level detection sensing module M further includes: a first signal processing unit 101, used to adjust the output voltage range from the temperature sensing module 100 to the input voltage range of the input terminal in the first A / D converter 102; the first A / D converter 102, used to convert the analog voltage output from the first signal processing unit 101 into digital data; a temperature conversion unit 103, used to convert the digital data output from the first A / D converter 102 into a temperature value; and a water level determination unit 104, which determines that the tempering solution filled into the tempering furnace F has reached a preset tempering solution water level line when the temperature value converted by the mass production temperature conversion unit 103 is 330 degrees or higher.

[0055] like Figure 2 As shown, the first signal processing unit 101 includes: a first micro-voltage amplification unit 105 for amplifying the micro-voltage output from the temperature sensing module 100 with a predetermined gain; a first filtering unit 106 for attenuating the noise level output from the first micro-voltage amplification unit 105; and a first zero-point adjustment unit 107 for adjusting the DC offset voltage level of the analog voltage signal output from the first filtering unit 106.

[0056] The first filtering unit 106 uses a Butterworth low-pass filter with more than 2 poles.

[0057] like Figure 2As shown, the water level determination unit 104 includes: a real-time temperature storage unit 108, used to sequentially store 10 or more temperature values ​​received from the temperature conversion unit 103; a storage quantity counting unit 109, used to count the number of temperature values ​​stored in the real-time temperature storage unit 108 in real time, so as to store a preset number of temperature values ​​in the real-time temperature storage unit 108; an average temperature value derivation unit 110, used to calculate the average temperature value of the preset number of temperature values ​​stored in the real-time temperature storage unit 108; and an initialization unit 111, which initializes the unit after the average temperature value is calculated by the average temperature value derivation unit 110. At that time, the multiple temperature values ​​stored in the real-time temperature storage unit 108 are initialized; the temperature reference value storage unit 112 stores 330 degrees as the temperature reference value of the tempering solution; the temperature comparison unit 113 is used to compare the average temperature value calculated by the average temperature value derivation unit 110 with the temperature reference value of the tempering solution stored in the temperature reference value storage unit 112; and the final determination unit 114, when the comparison result of the temperature comparison unit 113 shows that the average temperature value is above the temperature reference value of the tempering solution, finally determines that the tempering solution in the tempering furnace F has reached the preset water level.

[0058] On the other hand, such as Figure 3a As shown, the second embodiment of the present invention includes a water level detection unit C, which is disposed inside the glass tempering furnace F at a height equal to the water level line of the tempering solution to be filled into the tempering furnace F. When in contact with the tempering solution, it generates an electrical signal above or below a preset critical value to detect whether the tempering solution filled into the tempering furnace F has reached the preset tempering solution water level line.

[0059] The tempering furnace F is a conductor, according to... Figure 3a The second embodiment shown includes a water level detection unit C comprising: a water level detection measuring rod 200, set at a height equal to the water level line of the tempering solution to be filled into the tempering furnace F, and made of a conductor; and a resistance measuring module 201 for measuring the resistance value between the water level detection measuring rod 200 and the tempering furnace F.

[0060] According to such Figure 3b and Figure 3c In the second embodiment shown, when the resistance value between the water level detection measuring rod 200 and the tempering furnace F, as detected by the resistance measuring module 201, is in the range of 0.1 ohms to 100 ohms, the water level detection sensing module M determines that the tempering solution filled into the tempering furnace F has reached the preset tempering solution water level line.

[0061] like Figure 4As shown, the resistance measuring module 201 includes: a constant current supply unit 202 for supplying a constant current to the water level measuring rod 200; a constant current measuring unit 203 for measuring the constant current value input from the constant current supply unit 202 to the water level measuring rod 200 in real time; a voltage difference measuring unit 204 for measuring the voltage difference between the water level measuring rod 200 and the tempering furnace F; and a resistance measuring unit 205 for measuring the resistance value between the water level measuring rod 200 and the tempering furnace F using the voltage difference measured by the voltage difference measuring unit 204 and the constant current value measured in real time by the constant current measuring unit 203.

[0062] like Figure 4 As shown, the constant current measuring unit 203 includes: a shunt resistor 206 for measuring current, connected in series between the constant current supply unit 202 and the water level measuring rod 200; a voltage measuring unit 207 for measuring constant current, used to detect the voltage difference across the shunt resistor 206; and a constant current calculation unit 208, which uses the voltage difference across the shunt resistor 206 detected by the voltage measuring unit 207 and the value of the shunt resistor 206 to calculate the constant current value.

[0063] According to such Figure 5 In the first embodiment shown, the voltage measuring unit 204 for voltage difference detection includes: a second signal processing unit 209 that adjusts the voltage difference between the water level measuring rod 200 and the tempering furnace F to the range of the input voltage of the input terminal of the second A / D converter 210; the second A / D converter 210 that converts the analog voltage output from the second signal processing unit 209 into digital data; and a voltage conversion unit 211 that converts the digital data converted by the second A / D converter 210 into voltage.

[0064] like Figure 5 As shown, the second signal processing unit 209 includes: a voltage difference amplification unit 212 for amplifying the small voltage difference between the water level detection measuring rod 200 and the tempering furnace F; a shift voltage circuit unit 213 for adjusting the DC bias voltage level of the voltage difference amplification unit 212; and a second filter unit 214 for attenuating the noise signal level output from the voltage difference amplification unit 212.

[0065] like Figure 5 and Figure 6In one embodiment shown, the shift voltage circuit section 213 includes: a potential difference meter circuit section 215, which divides the input DC voltage by a predetermined ratio and outputs it according to the internal resistance ratio; a first resistor 216, which is connected in series with the potential difference meter circuit section 215 and has one end grounded; and an output voltage holding circuit section 217, which transmits the output voltage of the potential difference meter circuit section 215 to the DC bias voltage input terminal of the voltage difference amplification section 212 in a non-attenuated state.

[0066] The shift voltage circuit section 213 can adjust the DC bias voltage level of the voltage difference amplification section 212 by changing the internal resistance ratio of the potential difference meter circuit section 215.

[0067] The second filtering unit 214 uses a Butterworth low-pass filter with more than 2 poles.

[0068] The potassium nitrate level detection sensor module M of the present invention, constructed with this structure, can automatically identify whether the molten liquid state of potassium nitrate in the tempering furnace F has reached the preset water level line of the tempering furnace F.

[0069] Furthermore, the present invention can temper glass with an appropriate amount of potassium nitrate by automatically identifying whether the molten liquid state of potassium nitrate in the tempering furnace F has reached the preset water level line of the tempering furnace F.

[0070] Furthermore, by automatically identifying whether the molten liquid potassium nitrate in the tempering furnace F has reached the preset water level line of the tempering furnace F, the present invention can reduce the time and manpower wasted in adjusting the potassium nitrate water level in the tempering furnace F and realize the automation of the glass tempering process.

Claims

1. A sensing module (M) for detecting potassium nitrate level in a tempering furnace, characterized in that, The system includes a water level detection unit (C), which is installed inside the glass tempering furnace (F) at a height equal to the water level line of the tempering solution to be filled into the furnace (F). When in contact with the tempering solution, it generates an electrical signal above or below a preset threshold value to detect whether the tempering solution filled into the furnace (F) has reached the preset tempering solution water level line. The tempering furnace (F) is a conductor. The water level detection unit (C) includes: A water level measuring rod (200), set at a height equal to the water level line of the tempering solution to be filled into the tempering furnace (F), is made of a conductor; and The resistance measuring module (201) is used to measure the resistance value between the water level measuring rod (200) and the tempering furnace (F); The resistance measuring module (201) includes: A constant current supply unit (202) is used to supply a constant current to the water level detection rod (200); The constant current measuring unit (203) is used to measure the constant current value input from the constant current supply unit (202) to the water level measuring rod (200) in real time; A voltage measuring unit (204) for detecting voltage difference is used to measure the voltage difference between the water level measuring rod (200) and the tempering furnace (F); and The resistance measuring unit (205) uses the voltage difference between the water level measuring rod (200) and the tempering furnace (F) measured by the voltage difference measuring unit (204) and the constant current value measured in real time by the constant current measuring unit (203) to measure the resistance value between the water level measuring rod (200) and the tempering furnace (F). The voltage measuring unit (204) for voltage difference detection includes: The second signal processing unit (209) adjusts the voltage difference between the water level detection measuring rod (200) and the tempering furnace (F) to the range of the input voltage of the input terminal of the second A / D converter (210); The second A / D converter (210) converts the analog voltage output from the second signal processing unit (209) into digital data; and The voltage conversion unit (211) converts the digital data converted by the second A / D converter (210) into voltage.

2. The sensing module (M) for detecting potassium nitrate level in a tempering furnace according to claim 1, characterized in that, When the resistance value between the water level detection measuring rod (200) and the tempering furnace (F) detected by the resistance measuring module (201) is in the range of 0.1 ohms to 100 ohms, the water level detection sensing module (M) determines that the tempering solution filled into the tempering furnace (F) has reached the preset tempering solution water level line.

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