A continuous molten steel temperature measuring device for a ladle

Abstract

The present invention discloses a continuous molten steel temperature measuring device for a ladle, which includes an infrared temperature measuring probe, a transmission cable, and a signal processing unit. The infrared temperature measuring probe is connected to one end of the transmission cable through a cable interface, and the signal processing unit is connected to the other end of the cable. The signal processing unit processes the received infrared temperature measuring signal and sends it out for display on a display. The infrared temperature measuring probe includes a sleeve, and an infrared light detection rod is arranged inside the sleeve. A cooling gas channel is arranged between the infrared light detection rod and the sleeve. The infrared light detection rod is provided with infrared light detection holes from front to back. A condenser convex lens, a fixed aperture diaphragm, and an infrared detection chip are respectively arranged in the infrared light detection holes from front to back. Infrared light passes through the fixed aperture diaphragm after being condensed by the condenser convex lens and reaches the infrared detection chip. An adjustable aperture diaphragm is arranged between the infrared detection chip and the fixed aperture diaphragm, and the adjustment knob of the adjustable aperture diaphragm is adjusted and locked through an adjustment locking mechanism.

Description

Technical Field

[0001] The present invention relates to the field of infrared temperature measurement, and particularly to a continuous molten steel temperature measurement device for a ladle, which is applicable to real-time continuous temperature measurement of molten steel in an intermediate ladle for continuous casting. Background Art

[0002] The traditional continuous molten steel temperature measurement instrument for an intermediate ladle is connected with a large display screen, and the large display screen is placed on the wall for easy observation. The temperature measurement probe of the temperature measurement instrument is an infrared temperature measurement probe. The infrared temperature measurement probe needs to be close to the ladle to detect the temperature and is in a high-temperature working environment. The infrared temperature measurement probe needs to lead the signal to the temperature measurement instrument through a signal transmission cable. Although the infrared temperature measurement probe is in a high-temperature working environment and the infrared temperature measurement probe device needs to be cooled by a cooling structure, a signal processing interface circuit cannot be arranged following behind the probe. Therefore, the signal processing interface circuit needs to be separately arranged as an interface circuit box body at the other end far from the temperature measurement probe and connected to the signal transmission cable. Since the traditional infrared temperature measurement probe is a non-standard design, due to processing and assembly errors, the output signal needs to be calibrated through a signal processing circuit. Therefore, every time the infrared temperature measurement probe fails and needs to be repaired and replaced, the infrared temperature measurement probe needs to be mailed to the manufacturer together with the cable and the signal processing interface circuit for repair and replacement. The transmission cable is thick and long, and mailing is extremely inconvenient. During the replacement process, the infrared temperature measurement probe needs to be recalibrated. The infrared temperature measurement probe needs to be matched with the signal processing interface circuit, and users must order the whole set, which is extremely inconvenient for maintenance and increases the maintenance cost of users. Summary of the Invention

[0003] The purpose of the present invention is to provide a continuous molten steel temperature measurement device for a ladle. By improving the infrared temperature measurement probe, an infrared optical path adjustment mechanism is added, so that it can directly output a calibrated standard signal, completely changing the maintenance concept. Maintenance only requires replacing the infrared temperature measurement probe, which greatly facilitates the maintenance of users.

[0004] To achieve the above purpose, the technical solution of the present invention is: a continuous molten steel temperature measurement device for a ladle, including an infrared temperature measurement probe, a transmission cable, and a signal processing unit. The infrared temperature measurement probe is connected to one end of the transmission cable through a cable interface, and the signal processing unit is connected to the other end of the cable. The signal processing unit processes the received infrared temperature measurement signal and sends it out for display on a display. The infrared temperature measurement probe includes a sleeve, an infrared light detection rod is arranged inside the sleeve, a cooling gas channel is arranged between the infrared light detection rod and the sleeve, the infrared light detection rod is provided with infrared light detection holes from front to back, a condenser convex lens, a fixed aperture diaphragm, and an infrared detection chip are respectively arranged in the infrared light detection holes from front to back. Infrared light passes through the condenser convex lens and then passes through the fixed aperture diaphragm to the infrared detection chip. Among them, an adjustable aperture diaphragm is arranged between the infrared detection chip and the fixed aperture diaphragm, and the adjustment knob of the adjustable aperture diaphragm is adjusted and locked through an adjustment locking mechanism.

[0005] The further solution is that: the adjustment and locking mechanism includes an adjustment hole arranged radially on the infrared light detection rod. The adjustment hole deviates from the radial center of the infrared light detection rod and is on the side of the adjustable aperture diaphragm. The adjustment knob of the adjustable aperture diaphragm penetrates radially through the adjustment hole. The adjustment knob can swing back and forth along the axial direction of the adjustment hole in the adjustment hole. Threads are respectively arranged on both sides of the adjustment knob in the adjustment hole. Two adjustment screws are respectively screwed into the adjustment hole from both ends of the adjustment hole. The adjustment knob is adjusted and locked by the adjustment method of screwing one adjustment screw out and screwing the other adjustment screw in.

[0006] The further solution is that: there are two fixed aperture diaphragms between the adjustable aperture diaphragm and the condenser convex lens. The two fixed aperture diaphragms are arranged at intervals and are respectively the first fixed aperture diaphragm and the second fixed aperture diaphragm. The first fixed aperture diaphragm is closely attached to the plane side of the condenser convex lens. The second fixed aperture diaphragm is arranged at a distance not greater than 10 mm from the adjustable aperture diaphragm. A third fixed aperture diaphragm is arranged between the adjustable aperture diaphragm and the infrared detection chip. The fixed apertures of the first fixed aperture diaphragm, the second fixed aperture diaphragm and the third fixed aperture diaphragm are different. The first fixed aperture diaphragm is used to limit the condenser aperture. The second fixed aperture diaphragm and the third fixed aperture diaphragm are used to limit the field angle of the infrared light passing through.

[0007] The further solution is that: a protective cover is arranged at the front end of the infrared light detection rod. The protective cover includes a sleeve. One end of the sleeve is sleeved on the outer side of the front end of the infrared light detection rod. The other end of the sleeve extends out of the tube sleeve. A gap is left between the sleeve and the tube sleeve. Cooling gas is blown out from the gap. The center of the sleeve is a through hole. A dust-proof filter lens is arranged at the front end of the condenser convex lens in the through hole.

[0008] The further solution is that: there are at least two dust-proof filter lenses, and the two dust-proof filter lenses are arranged at intervals.

[0009] The further solution is that: arc-shaped or rhombic protrusions are arranged on the outer circumference of the infrared light detection rod. The arc-shaped or rhombic protrusions are used to increase the disturbance when the cooling gas passes through to improve the cooling efficiency.

[0010] The further solution is that: the signal lead-out wire of the infrared detection chip is led out through a transmission cable and connected to a signal processing unit. A cooling gas delivery channel is simultaneously arranged in the transmission cable. The cooling gas delivery channel is communicated with the cooling gas channel of the infrared temperature measurement probe through a cable interface.

[0011] The beneficial effects of the present invention are as follows: By adjusting the adjustable diaphragm, for a temperature measurement probe within the same temperature measurement range, at the same temperature point, with an amplifier circuit having the same fixed gain, the temperature measurement probe can output signals of the same magnitude, enabling the display instrument to display the same temperature; the temperature measurement probes within the same temperature measurement range can be interchanged, and the display instruments within the same temperature measurement range can be interchanged; the production of temperature measurement probes and display instruments can be simplified and standardized; users can order and replace temperature measurement probes and display instruments separately, which is convenient for maintenance and use and reduces costs; the manufacturer can reduce the after-sales service volume, save expenses, and improve efficiency.

[0012] By improving the infrared temperature measurement probe, the present invention adds an infrared optical path adjustment mechanism, enabling it to directly output calibrated standard signals, completely changing the maintenance concept. For maintenance, only the infrared temperature measurement probe needs to be replaced, and there is no longer a need to mail the connecting cable and the signal processing interface circuit together, greatly facilitating user maintenance, reducing the user's maintenance cost, alleviating the labor intensity, and improving work efficiency.

[0013] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. Description of the Drawings

[0014] Figure 1 is a schematic structural diagram of the present invention;

[0015] Figure 2 is a schematic structural diagram of the infrared temperature measurement probe of the present invention;

[0016] Figure 3 is a schematic structural diagram of the adjustment and locking mechanism of the adjustable aperture diaphragm of the present invention;

[0017] Figure 4 is a schematic diagram of the adjustable aperture diaphragm adjusted to a moderate aperture state;

[0018] Figure 5 is a schematic diagram of the adjustable aperture diaphragm adjusted to a large aperture state. Detailed Embodiment

[0019] A molten steel continuous temperature measurement device for a ladle is used for real-time continuous temperature measurement of molten steel in an intermediate ladle for continuous casting. As Figure 1 and Figure 2As shown in the figure, the continuous molten steel temperature measuring device includes an infrared temperature measuring probe 1, a transmission cable 2, a signal processing unit 3, and a display 4. One end of the infrared temperature measuring probe is connected to one end of the transmission cable through a cable interface 5. The signal processing unit is connected to the other end of the cable. The signal processing unit is arranged in a housing and connected to the other end of the cable through a plug-in connector. The signal processing unit processes the received infrared temperature measuring signal and sends it to the display for display. The display can be encapsulated in a housing together with the processing unit. In this embodiment, the display is a large-screen display and is separately hung on the wall from the signal processing unit. The infrared temperature measuring probe measures the temperature of the molten steel by sensing the infrared signal 7 of the molten steel in the ladle 6 at a distance of about 1 meter above the molten steel. Among them: As Figure 2 As shown in the figure, the infrared temperature measuring probe includes a sleeve 101, which is a stainless steel sleeve. An infrared light detection rod 102 is arranged inside the sleeve 101. A cooling gas channel 103 is arranged between the infrared light detection rod and the sleeve. The infrared light detection rod is provided with an infrared light detection through hole 104 from front to back. A condenser convex lens 105, a fixed aperture diaphragm, and an infrared detection chip 106 are respectively arranged in the infrared light detection hole from front to back. The infrared detection chip is a silicon photocell and is arranged on a circuit board. The fixed aperture diaphragm is used to limit the infrared light passing through, and the number of sheets can be adjusted and set according to the need of the aperture. In this embodiment, two fixed aperture diaphragms are provided. The two fixed aperture diaphragms are arranged at intervals and are respectively the first fixed aperture diaphragm 107 and the second fixed aperture diaphragm 108. The first fixed aperture diaphragm is closely attached to the plane side of the condenser convex lens. The second fixed aperture diaphragm is arranged at a distance not greater than 10 mm from the adjustable aperture diaphragm. The first fixed aperture diaphragm is used to limit the condenser aperture. The hole of the second fixed aperture diaphragm is a tapered hole used to limit the field angle of the infrared light passing through. The infrared light passes through the condenser convex lens and then passes through the fixed aperture diaphragm to the infrared detection chip. An adjustable aperture diaphragm 109 is arranged between the infrared detection chip 106 and the fixed aperture diaphragm (the first fixed aperture diaphragm and the second fixed aperture diaphragm). The adjustment knob of the adjustable aperture diaphragm is adjusted and locked through an adjustment locking mechanism.

[0020] With the above structure, an infrared temperature standard source is provided at the front end of the infrared temperature measurement probe 1. The infrared light signal obtained by the condenser convex lens 105 is corrected by adjusting the adjustable aperture diaphragm 109 so that the infrared detection chip outputs a standard signal. In this way, the measurement error problem of the standard source caused by the installation error of the infrared optical lens formed by the processing precision error is overcome. By adjusting the adjustable diaphragm, for the temperature measurement probes within the same temperature measurement range, at the same temperature point, an amplifier circuit with the same fixed gain is used, so that the temperature measurement probes output signals of the same size, thereby enabling the display instrument to display the same temperature, realizing the interchangeability of the temperature measurement probes within the same temperature measurement range and the interchangeability of the display instruments within the same temperature measurement range, and simplifying and standardizing the production of the temperature measurement probes and display instruments. Therefore, the problem of having to mail the cable and signal processing unit together during the maintenance process is solved. Only the infrared temperature measurement probe 1 needs to be replaced. It can be seen that the setting of the adjustable aperture diaphragm 109 brings unexpected effects.

[0021] To improve the calibration accuracy and stability, a third fixed aperture diaphragm 110 is provided between the adjustable aperture diaphragm and the infrared detection chip. The aperture of the third fixed aperture diaphragm is also a tapered hole to further limit the field angle of the infrared light passing through. The distance between the third fixed aperture diaphragm and the infrared detection chip is adjusted and set between 30 and 100 mm. Due to different functions, the fixed apertures of the first fixed aperture diaphragm, the second fixed aperture diaphragm, and the third fixed aperture diaphragm are different. The settings of the first fixed aperture diaphragm, the second fixed aperture diaphragm, and the third fixed aperture diaphragm provide guarantees for reducing the spot diameter (measurement point diameter) and improving the measurement accuracy. The fixed aperture diaphragm can be directly processed according to the shape and size of the aperture, and the adjustable aperture diaphragm can be directly purchased on the market.

[0022] In the embodiment, the adjustment and locking mechanism can be realized in various structural ways. For example, a snap buckle pressing plate or a setscrew is provided at the adjustment knob of the adjustable aperture diaphragm. After adjustment, the adjustment knob of the adjustable aperture diaphragm is locked by tightening with a screw through the snap buckle pressing plate or tightening with a setscrew. In this embodiment, a double-setscrew adjustment mechanism is adopted to realize it. As Figure 3 、 Figure 4 and Figure 5 shown, the adjustment and locking mechanism includes an adjustment hole 102-1 provided radially on the infrared light detection rod. The adjustment hole deviates from the radial center of the infrared light detection rod and is on the side of the adjustable aperture diaphragm. The adjustment knob 109-1 of the adjustable aperture diaphragm penetrates radially through the adjustment hole. The adjustment knob 109-1 can swing back and forth along the axial direction of the adjustment hole in the adjustment hole 102-1. Threads are respectively provided in the adjustment holes on both sides of the adjustment knob. Two adjustment screws 8 and 9 are respectively screwed into the adjustment hole from both ends of the adjustment hole. The adjustment knob is adjusted and locked by the adjustment method of screwing one adjustment screw out and screwing the other adjustment screw in.

[0023] Figure 3 It shows the state where the aperture is adjusted to be smaller. Figure 4 It shows the state where the aperture is adjusted to be moderate. Figure 5 It shows the state where the aperture is adjusted to be larger.

[0024] In the embodiment: A protective cover is provided at the front end of the infrared light detection rod. The protective cover includes a sleeve 10. One end of the sleeve 10 is sleeved on the outer side of the front end of the infrared light detection rod, and the other end of the sleeve extends out of the pipe sleeve 101. A gap is left between the sleeve and the pipe sleeve, and the cooling gas is blown out from the gap. The center of the sleeve is a through hole, and a dust-proof filter lens is provided at the front end of the condenser convex lens in the through hole. Among them, there are at least two dust-proof filter lenses 11 and 12, and the two dust-proof filter lenses are arranged at intervals.

[0025] In order to improve the heat dissipation effect, arc or rhombus protrusions 102-2 are provided on the outer circumference of the infrared light detection rod. The arc or rhombus protrusions are used to increase the disturbance when the cooling gas passes through to improve the cooling efficiency.

[0026] And: The signal lead wire 13 of the infrared detection chip is led out through a transmission cable and connected to the signal processing unit. A cooling gas delivery channel is also provided in the transmission cable, and the cooling gas delivery channel is communicated with the cooling gas channel of the infrared temperature measurement probe through a cable interface.

Claims

1. A continuous molten steel temperature measuring device for a ladle, comprising an infrared temperature measuring probe, a transmission cable, and a signal processing unit. The infrared temperature measuring probe is connected to one end of the transmission cable through a cable interface, and the signal processing unit is connected to the other end of the cable. The signal processing unit processes the received infrared temperature measuring signal and sends it out for display on a display. The infrared temperature measuring probe includes a sleeve, an infrared light detecting rod is arranged inside the sleeve, a cooling gas channel is arranged between the infrared light detecting rod and the sleeve, the infrared light detecting rod is provided with infrared light detecting holes from front to back, a condenser convex lens, a fixed aperture diaphragm, and an infrared detection chip are respectively arranged in the infrared light detecting holes from front to back. Infrared light passes through the fixed aperture diaphragm after being condensed by the condenser convex lens and reaches the infrared detection chip. It is characterized in that an adjustable aperture diaphragm is arranged between the infrared detection chip and the fixed aperture diaphragm, the adjustment knob of the adjustable aperture diaphragm is adjusted and locked through an adjustment locking mechanism, an infrared temperature standard source is arranged at the front end of the infrared temperature measuring probe, and the infrared temperature measuring probe corrects the obtained standard source infrared light signal by adjusting the adjustable aperture diaphragm and outputs a standard signal, so that the infrared temperature measuring probes at one end of the transmission cable can be interchanged under the condition that the signal processing unit remains unchanged in the same temperature measuring range.

2. The continuous molten steel temperature measuring device for a ladle according to claim 1, It is characterized in that the adjustment locking mechanism includes an adjustment hole arranged radially on the infrared light detecting rod, the adjustment hole deviates from the radial center of the infrared light detecting rod and is on the side of the adjustable aperture diaphragm, the adjustment knob of the adjustable aperture diaphragm penetrates radially through the adjustment hole, the adjustment knob can swing back and forth along the axial direction of the adjustment hole in the adjustment hole, threads are respectively arranged in the adjustment holes on both sides of the adjustment knob, and two adjustment screws are respectively screwed into the adjustment hole from both ends of the adjustment hole. The adjustment knob is adjusted and locked by the adjustment method of screwing out one adjustment screw and screwing in the other adjustment screw.

3. The continuous molten steel temperature measuring device for a ladle according to claim 1, It is characterized in that there are two fixed aperture diaphragms between the adjustable aperture diaphragm and the condenser convex lens. The two fixed aperture diaphragms are arranged at intervals and are respectively a first fixed aperture diaphragm and a second fixed aperture diaphragm. The first fixed aperture diaphragm is closely attached to the plane side of the condenser convex lens, the second fixed aperture diaphragm is arranged at a distance not greater than 10 mm from the adjustable aperture diaphragm, a third fixed aperture diaphragm is arranged between the adjustable aperture diaphragm and the infrared detection chip, and the fixed apertures of the first fixed aperture diaphragm, the second fixed aperture diaphragm, and the third fixed aperture diaphragm are different. The first fixed aperture diaphragm is used to limit the condensing aperture, and the second fixed aperture diaphragm and the third fixed aperture diaphragm are used to limit the field angle of infrared light passing through.

4. The continuous molten steel temperature measuring device for a ladle according to claim 1, It is characterized in that a protective cover is arranged at the front end of the infrared light detecting rod. The protective cover includes a sleeve. One end of the sleeve is sleeved on the outer side of the front end of the infrared light detecting rod, the other end of the sleeve extends out of the sleeve, a gap is left between the sleeve and the sleeve, cooling gas is blown out from the gap, the center of the sleeve is a through hole, and a dust-proof filter lens is arranged at the front end of the condenser convex lens in the through hole.

5. The continuous molten steel temperature measuring device for ladle according to claim 4, characterized in that, there are at least two dust-proof filters, and the two dust-proof filters are arranged at intervals.

6. The continuous molten steel temperature measuring device for ladle according to claim 1, characterized in that, arc-shaped or rhombic protrusions are arranged on the outer circumference of the infrared light detection rod, and the arc-shaped or rhombic protrusions are used to increase the disturbance when the cooling gas passes through to improve the cooling efficiency.

7. The continuous molten steel temperature measuring device for ladle according to claim 1, characterized in that, the signal lead-out wire of the infrared detection chip is led out through a transmission cable and connected to the signal processing unit, and a cooling gas delivery channel is arranged in the transmission cable at the same time, and the cooling gas delivery channel is communicated with the cooling gas channel of the infrared temperature measuring probe through a cable interface.

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