Temperature measuring gun for nodular cast iron ladle
By integrating non-contact and contact temperature measuring elements, the temperature gun for ductile iron ladles solves the problems of worker safety and high cost, achieving a dual improvement in safety and economy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JINING ANTAI MINING EQUIP MFG CO LTD
- Filing Date
- 2025-11-07
- Publication Date
- 2026-06-26
AI Technical Summary
Existing methods for measuring the temperature of ductile iron ladles pose safety hazards to workers and are costly. Infrared temperature measurement is inaccurate, while thermocouple temperature measurement is expensive, and reliance on worker experience leads to unstable product quality.
A temperature gun integrating non-contact and contact temperature measuring elements was designed. The temperature of molten iron is estimated by non-contact temperature measurement, and contact temperature measurement is only performed when the expected temperature is reached, which reduces the amount of thermocouples used, improves safety and reduces costs.
This significantly reduces the use of thermocouples, decreases the number of times workers need to get close to the temperature, improves operational safety, and reduces temperature measurement costs, while maintaining high temperature measurement accuracy.
Smart Images
Figure CN224416245U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a temperature measuring gun for ductile iron casting ladles. Background Technology
[0002] Ductile iron is a preferred material for the automotive industry, cast pipes and fittings, and various industrial equipment and mechanical components due to its near-steel strength and toughness, excellent wear resistance, and relatively low cost compared to steel. However, while its cost is relatively low, ductile iron is extremely sensitive to temperature from tapping and spheroidization to inoculation and pouring; even small temperature changes during pouring can have a significant impact on the performance of the final product.
[0003] Common methods for measuring ladle temperature include infrared thermography and thermocouple temperature gun measurement. Infrared thermography is a non-contact method, offering relatively good safety and preventing damage to the infrared thermography device. However, despite its advantages such as low cost and convenient operation in frequent use environments, the extremely high temperature of molten iron (typically 1400℃~1460℃ when tapping from the furnace, and further heating is required during spheroidizing, resulting in temperatures typically between 1450℃~1500℃) causes an oxide film to form on the surface of the molten iron, affecting measurement accuracy. Under these conditions, workers often need to bring their hands close to the molten iron, increasing the risk of burns and resulting in inaccurate measurements.
[0004] Therefore, to obtain high temperature measurement accuracy, a contact temperature measurement method is required, and the aforementioned thermocouple temperature gun method is a common contact temperature measurement method. The thermocouples used in thermocouple temperature guns are consumables; therefore, steel mills need to stock a large number of thermocouples, and the cost of temperature measurement increases with the number of measurements. Consequently, many workshops reduce the number of pre-pouring temperature measurements for cost considerations, making the control of pouring temperature more reliant on worker experience, significantly reducing the stability of product quality. Therefore, it is necessary to design a temperature measurement device that can both protect workers and save costs.
[0005] It should be noted that the above background technology is technical information that the inventor has acquired in order to deduce the relevant technical problems or obtained in the process of designing this utility model, and does not mean that the above background technology was already prior art before this utility model application, especially the technical content of the cognition and confirmation of the relevant technical problems. Utility Model Content
[0006] The purpose of this invention is to provide a temperature measuring gun for ductile iron ladles that can balance worker safety and cost savings.
[0007] According to an embodiment of this utility model, a temperature measuring gun for ductile iron ladles is provided, comprising:
[0008] The gun body has a built-in temperature measurement circuit unit;
[0009] The main barrel has one end connected to the gun body and the other end used to install a temperature measuring head. The temperature measuring head is equipped with a thermocouple pair. The main tube cavity of the main barrel is used to pass through a first cable, which is used to connect the thermocouple pair to the temperature measuring circuit unit.
[0010] The secondary barrel assembly is arranged in parallel with the main barrel, with one end connected to the gun body and the other end equipped with a non-contact temperature measuring element. The secondary barrel cavity of the secondary barrel assembly is used to pass through a second cable, which is used to connect the non-contact temperature measuring element to the temperature measuring circuit unit.
[0011] Optionally, the secondary barrel assembly includes:
[0012] The secondary barrel is fixedly connected to the gun body at one end and forms an access port at the other end;
[0013] The telescopic tube is nested at its tail end into the secondary barrel and guided by the secondary barrel; the telescopic tube and the secondary barrel achieve telescopic extension and retraction and holding after telescopic adjustment based on predetermined damping, or achieve telescopic adjustment and position locking after telescopic adjustment based on the sleeve formed by nesting and combined with locking components.
[0014] Optionally, the secondary barrel is a single-layer tube structure or a double-layer tube structure;
[0015] If it is a single-layer pipe structure, the telescopic pipe is guided by the inner wall of the single pipe or by the guide strip formed on the inner wall of the single pipe;
[0016] If it is a double-layered tube structure, the telescopic tube is guided by the inner tube in the double-layered tube.
[0017] Optionally, a reset device for resetting the telescopic tube forward is provided in the secondary barrel assembly;
[0018] Accordingly, an adjustment hole extending axially from the secondary barrel assembly is provided on the tube wall of the secondary barrel assembly, and an actuating part connected to the telescopic tube and having an extension extending out of the adjustment hole is provided to adjust the extension amount of the telescopic tube.
[0019] Optionally, the actuating part is a locking screw or a lever;
[0020] When using a lever, the lever and the telescopic tube are connected by a second spring guide post, and the second spring adapted to the second spring guide post is a tension spring.
[0021] Optionally, the reset device is a first compression spring;
[0022] The telescopic tube is provided with an annular push block at its tail end. One end of the first compression spring is supported by the annular push block, and the other end is supported by an annular protrusion or cover inside the secondary barrel.
[0023] Optionally, the temperature measuring head includes an encapsulation body formed of refractory material and a thermocouple pair embedded in the encapsulation body;
[0024] The package has leads or connectors at the tail end.
[0025] Optionally, the rear end of the gun body has a display and operation terminal.
[0026] Optionally, a grip is provided on the lower side of the rear end of the gun body.
[0027] Optionally, the gun body and the grip are integrally injection molded;
[0028] The injection-molded body that forms the gun body has a skeleton.
[0029] The temperature measuring gun for ductile iron ladle according to this utility model integrates two temperature measuring components: a non-contact temperature measuring element and a thermocouple pair. In use, the non-contact temperature measuring element is first used to estimate whether the molten iron temperature has reached the expected tapping temperature. If not, thermocouple temperature measurement is unnecessary. Only when the expected tapping temperature is reached is the thermocouple used to accurately determine the tapping temperature. Under these conditions, the number of thermocouples used can be significantly reduced, thus reducing the number of thermocouples worn out and significantly lowering the temperature measuring cost. Due to the gun-type structure, the barrel extends the operator's operating distance and reduces the number of thermocouple temperature measurements, i.e., reducing the number of close-range measurements, greatly improving operator safety. Attached Figure Description
[0030] Figure 1 This is a block diagram of the electrical principle of a temperature measuring gun for a ductile iron ladle in one embodiment.
[0031] Figure 2 This is a schematic diagram of the main structure of a temperature measuring gun for a ductile iron ladle in one embodiment.
[0032] Figure 3 for Figure 2 Enlarged view of Part I.
[0033] Figure 4 This is a schematic diagram of the main cross-section of a temperature measuring gun used in a ductile iron ladle in one embodiment.
[0034] Figure 5 for Figure 4 Enlarged view of Part II.
[0035] Figure 6This is a right-side cross-sectional view of a temperature measuring gun used in a ductile iron ladle in one embodiment (5:1 enlargement).
[0036] In the diagram: 1. Temperature sensor mounting tube, 2. Infrared sensor, 3. Main barrel, 4. Telescopic tube, 5. Extension adjustment section, 6. Secondary barrel, 7. Gun body, 8. Grip, 9. Display and operation end, 10. Locking screw, 11. First spring, 12. Adjustment hole, 13. Outer tube, 14. Main tube cavity, 15. Annular push block, 16. Inner tube, 17. Secondary tube cavity, 18. Toggle block, 19. Secondary return spring. Detailed Implementation
[0037] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of this utility model focus on the integration of non-contact and contact temperature measurement, while for... Figure 1 The two temperature measurement circuit units in the illustrated electrical principle block diagram of the temperature measuring gun for ductile iron ladle are both temperature measurement circuit units corresponding to conventional temperature measurement methods in this field. They are integrated into a temperature measuring circuit for the temperature measuring gun for ductile iron ladle.
[0038] For two temperature sensing circuit units, a changeover switch can be used to connect them to the main circuit unit. Figure 1 In the illustrated structure, a switching switch can be installed at the analog-to-digital converter (ADC). The thermocouple, cold junction compensation circuit, and signal conditioning circuit adapted to this path constitute the first circuit unit; while the infrared thermopile sensor, ambient temperature compensation sensor, and signal conditioning circuit adapted to this path constitute the second circuit unit. As mentioned earlier, the first and second circuit units are existing technologies and will not be described in detail here. The subsequent components, including the analog-to-digital converter and display / control unit, can serve as either the main circuit unit or the back-end circuit unit. Complex control is not required; integration via, for example, a switching switch is sufficient. Control elements such as controllers are not necessary; only devices for displaying the sampled data, such as a display screen or touchscreen, can be configured.
[0039] It should be understood that, for the temperature measuring component, the end where the temperature measuring head is located is the head end, also known as the front end, and the opposite end is the rear end. Therefore, in the embodiments of this utility model, the front and rear are defined. Based on this, the left and right are also defined. However, it should be noted that in the embodiments of this utility model, terms such as up, down, left, right, inner, outer, front, and rear, as well as similar expressions, are for illustrative and explanatory purposes only, and are intended to avoid misunderstanding by those skilled in the art.
[0040] Similarly, statements that are mutually explanatory, such as vertical or horizontal, are also for the purpose of explanation or clarification.
[0041] In addition, in the field of mechanics, it should be known that the front-to-back direction is also called longitudinal, head-to-tail, or length direction, while the left-to-right direction is also called transverse, width direction, or width direction.
[0042] In addition, to facilitate the description of the relationship between one component or component and another component or component shown in the accompanying drawings, spatially relative terms such as "lower," "upper," and similar terms may be used in embodiments of this invention. It should be understood that the spatially relative terms are intended to cover different orientations of the device during use and operation, in addition to those depicted in the accompanying drawings.
[0043] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention.
[0044] Furthermore, as a special note, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0045] It should be understood that in the field of mechanics, standard geometric terms are typically used to describe approximate mechanical structures, without implying that the mechanical mechanism possesses the exact geometric features corresponding to those terms. For example, a circular tube is actually a tube with a cylindrical outline. In the field of mechanics, describing a component using a specific, explicit feature is a common descriptive method, but this does not mean that the component necessarily contains the exact geometric shape corresponding to that explicit feature.
[0046] The following description, following the content above, will first describe the electrical structure of the temperature measuring gun for ductile iron ladles, in order to assist in describing the mechanical structure of the temperature measuring gun for ductile iron ladles.
[0047] See Figure 1 In the embodiments of this utility model, the temperature measuring head still adopts a disposable temperature measuring head, which includes a thermocouple. Such temperature measuring heads are conventional configurations in the field. The main problem solved by the technical solution of this utility model is the large consumption of such disposable temperature measuring heads. As for the composition of the disposable temperature measuring head, the connection relationship between the disposable temperature measuring head and the rest of the first circuit unit, and the composition of the first circuit unit, they are all prior art and will not be described in detail here.
[0048] Similarly, the infrared thermopile sensor and the configuration of the second circuit unit are also prior art. Their usage frequency in the temperature measuring gun for ductile iron ladles is higher than that of the first circuit unit, thereby reducing the frequency of using disposable temperature measuring heads and lowering their consumption. The configuration of the second circuit unit is also prior art and will not be described further.
[0049] It should be noted that, in order to reduce the thermal impact, the first and second circuit units, except for the disposable temperature measuring head and the infrared thermopile sensor, are mainly located inside the gun body 7. For ease of explanation, the circuit unit located inside the gun body 7 is referred to as the temperature measuring circuit unit, and the disposable temperature measuring head and the infrared thermopile sensor are connected to the temperature measuring circuit unit through cables.
[0050] Correspondingly, the barrel is mainly used for wiring. Since it does not contain other circuit components, the requirements for the barrel are relatively low, and the range of barrel materials is relatively wide. It should be noted that if the inner cavity of the barrel is suitable for housing other components, such as the cold end compensation circuit in the first circuit unit, it can also be used as a cavity for, for example, the cold end compensation circuit.
[0051] Furthermore, conceptually speaking, for example, the cold junction in a cold junction compensation circuit is relative to the end of the thermocouple used for temperature measurement; it is merely a relative concept, not a concept of degree.
[0052] It should also be understood that for cables used to connect, for example, an infrared thermopile sensor and a temperature measuring circuit unit, any cable that satisfies the electrical connection between the two can be used. Therefore, in some embodiments, the cables used to connect the infrared thermopile sensor and the temperature measuring circuit unit are selected to be relatively soft, thereby adaptable to the extension and retraction of, for example, the telescopic tube 4.
[0053] In some embodiments, an automatic cable release device, such as an automatic cable releaser / automatic cable release device, can also be adapted to accommodate the extension and retraction of the telescopic tube 4.
[0054] It should also be noted that since infrared thermometry is a non-contact method, there is no need to get excessively close to the object for measurement. In other words, even without the telescopic tube 4, temperature measurement can still be completed without damaging the disposable temperature sensor. In particular, non-contact temperature measurement in this embodiment focuses on coarse measurement and does not have excessively high requirements for temperature measurement accuracy. In other words, in this embodiment, the inclusion of the telescopic tube 4 is a preferred embodiment, but not a necessary component in all embodiments.
[0055] In this embodiment of the invention, the gun body 7 is the base portion, while the gun barrel is the extension portion. As mentioned above, the gun barrel, as the extension portion, is mainly used for wiring and defining the detection space range, for example, suitable for inserting the thermocouple pair of the head into the molten iron. Under this condition, the inner cavity of the gun body 7 is mainly used to house the temperature measuring circuit unit.
[0056] The gun barrel is primarily made of metal, and its diameter can be as small as possible, while still allowing for cable accommodating purposes, to reduce overall weight. In terms of rigidity alone, for example, with a stainless steel barrel, even if the barrel wall thickness is less than or equal to 0.8mm, the rigidity is essentially not considered as a design parameter in this embodiment of the invention, as the barrel does not bear any weight during use.
[0057] The barrel is mainly made of low-carbon steel or stainless steel. As mentioned above, its rigidity is basically not a concern. Under relatively short temperature measurement time conditions, i.e., short heating time conditions, the barrel will not deform or change.
[0058] It should be noted that when using thermocouples for temperature measurement, the measurement time is usually between 1.24s and 5s, which is very short. Although the thermocouple needs to be inserted into the molten steel to avoid interference from things like slag, the gun barrel usually does not need to be replaced after the temperature measurement is completed because the heating time is short.
[0059] Considering the need for quick barrel replacement, the barrel and the gun body can be assembled using a threaded connection, for example, with a threaded hole in the barrel assembly structure and external threads at the base of the barrel, allowing for quick connection.
[0060] In addition, to achieve better thermal insulation, the barrel is sealed at the nozzle using materials such as aluminum oxide after the wire is threaded through.
[0061] In an embodiment of this utility model, the gun barrel includes a main gun barrel 3 and a secondary gun barrel 6, which are arranged side by side.
[0062] The tail end of the main barrel 3 is connected to the gun body 7 by means of, for example, a threaded connection, or by means of, a ferrule connection to achieve a quick connection.
[0063] The head end of the main barrel 3 is used to mount a temperature sensor, which is equipped with a thermocouple pair, forming a configuration as follows: Figure 1 As mentioned above, the disposable temperature probe shown in this embodiment focuses on how to reduce the amount of disposable temperature probes used. The connection between the disposable temperature probe and the main gun tube 3, as well as the basic structure of the main gun tube 3, are conventional technical means in this field and will not be described in detail here.
[0064] Accordingly, the main tube cavity 14 of the main gun barrel 3 is used to pass through a first cable, which is used for, for example, the connection of a thermocouple pair in a disposable temperature measuring head to the temperature measuring circuit unit.
[0065] For distinction, in embodiments of this utility model, the term "sub-barrel assembly" is used to refer to a concept parallel to the main barrel 3, but the sub-barrel assembly may only include, for example, the following: Figure 2 The secondary barrel 6 shown, but not including Figure 2 The telescopic tube 4 shown in the figure.
[0066] Secondary barrel 6 Figure 2 The middle barrel and the main barrel are arranged side by side, because in Figure 2 In the illustrated structure, the secondary barrel assembly includes a telescopic tube 4, where the length of the secondary barrel 6 is much smaller than the length of the main barrel 3. However, it should be noted that since the temperature measurement method of, for example, the infrared sensor 2 is non-contact, the measurement distance can be relatively large, and it is a coarse measurement. Therefore, under the condition that the infrared sensor 2 can perform temperature measurement, the main barrel 2 equipped with a disposable temperature measuring head is far away from the molten steel being measured, which will not cause damage to the disposable temperature measuring head. In other words, even without the telescopic tube 4, the need for coarse measurement can be met.
[0067] Meanwhile, during precision measurement, the disposable temperature probe is inserted into the molten steel. At this time, the auxiliary gun barrel 6 is outside the molten steel, which can ensure that the infrared sensor 2 will not be melted.
[0068] The connection method between the secondary barrel 6 and the gun body 7 is the same as the connection method between the main barrel 3 and the gun body 7 described above, and will not be repeated here.
[0069] Correspondingly, the tip of the secondary barrel 6 is used to mount a non-contact temperature sensing element, which includes, but is not limited to, the infrared sensor 2, and only needs to meet the requirements of non-contact coarse measurement. Disposable temperature probes are only used for fine measurement when the operator deems it necessary, rather than requiring fine measurement every time. Under these conditions, the usage of disposable temperature probes can be significantly reduced, as can the number of times the operator approaches the temperature sensor, thus greatly improving safety.
[0070] Furthermore, the secondary chamber 17 of the secondary barrel assembly is used to carry a second cable, which is used to connect the non-contact temperature sensing element to the temperature sensing circuit unit.
[0071] In a preferred embodiment, the secondary barrel assembly includes a secondary barrel 6 and a telescopic tube 4, wherein the rear end of the secondary barrel 6 is fixedly connected to the gun body 7, and the head end of the secondary barrel 6 constitutes an intervention end with an intervention port for the intervention of the telescopic tube 4.
[0072] The tail end of the telescopic tube 4 is nested into the secondary barrel 6 and guided by the secondary barrel 6. That is, the extension amount of the telescopic tube 4 can be adjusted by means of cooperation with the secondary barrel 6.
[0073] Furthermore, the telescopic tube 4 and the secondary barrel 6 can achieve telescopic extension and retraction, as well as positional adjustment, based on predetermined damping. Their structural configuration is similar to, for example, a telescopic antenna; this is common knowledge in the mechanical field and will not be elaborated upon here. The telescopic tube 4 and the secondary barrel 6 can also achieve telescopic adjustment and positional locking based on a sleeve formed by their nesting and a locking mechanism. For example… Figure 2 and Figure 3 The locking screw 10 shown can be, for example, a wing screw or a handwheel screw, for easy manual operation. The locking screw 10 is also used for push-pull operation by the operator.
[0074] When using, for example, an infrared sensor 2 for coarse measurement, the telescopic tube 4 can be extended to expand the temperature measurement range of the infrared sensor 2. After the coarse measurement is completed, the telescopic tube 4 can be stored in the secondary gun barrel 6 to reduce the potential damage or destruction to the infrared sensor 2 during fine measurement.
[0075] Furthermore, the secondary barrel 6 can adopt a single-layer tube structure or a double-layer tube structure. If a single-layer tube structure is adopted, the telescopic tube 4 is guided by the inner wall of the single tube or by a guide strip formed on the inner wall of the single tube. The guide strip is similar to a linear guide rail in this case.
[0076] It should be noted that the guidance of the secondary barrel 6 to the telescopic tube 4 does not require a relatively tight fit between the two. As long as the two are coaxial, the gap between them should not be greater than 3mm and not less than 0.5mm.
[0077] If the secondary barrel 6 adopts a double-tube structure, the telescopic tube 4 is guided by the inner tube 16 within the double-tube structure. This structure facilitates the installation of, for example, a first return spring 11. The first return spring 11 can be either a tension spring or a compression spring. When a tension spring is used, if the secondary barrel 6 and the telescopic tube 4 are disengaged, the telescopic tube 4 will retract into the secondary barrel 6 under the action of the tension spring. If a compression spring is used, assuming the telescopic tube 4 is manually retracted into the secondary barrel 6, the telescopic tube 4 will pop out under the condition of disengagement, facilitating rapid operation.
[0078] It should also be noted that, for example, when a structure similar to a telescopic antenna is adopted by means of damping, the extension and retraction of the telescopic tube 4 can be manually controlled without the need for a reset device.
[0079] Therefore, regardless of whether manual reset is used or reset by means of, for example, the first reset spring 11, the telescopic tube 4 needs to be manually operated to be in a non-reset position, which can be, for example, the working position or the storage position.
[0080] Correspondingly, an adjustment hole 12 extending axially from the secondary barrel assembly is provided on the tube wall of the secondary barrel assembly, and an actuating part connected to the telescopic tube 4 and having an extension extending out of the adjustment hole 12 is provided to adjust the extension amount of the telescopic tube 4.
[0081] exist Figure 3 In the illustrated structure, the actuating part is a locking screw 10, while... Figure 6 In the illustrated structure, the actuating part is the toggle block 18.
[0082] When using the lever 18, the lever 18 and the telescopic tube 4 are connected by a second spring guide post. The second spring adapted to the second spring guide post is a tension spring. The tension spring causes a predetermined frictional force to be formed between the telescopic tube 4 and the secondary gun barrel 6. The pushing and pulling of the lever 18 is used to overcome this frictional force to realize the retraction or extension of the telescopic tube 4.
[0083] In addition, Figure 5 In the illustrated structure, the tail end of the telescopic tube 4 is provided with an annular push block 15. For example, one end of the first compression spring is supported on the annular push block 15, and the other end is supported on the annular protrusion or cover inside the secondary barrel 6, thereby providing a restoring force for the telescopic tube 4 to extend outward.
[0084] Figure 6 In the structure shown, the predetermined damping can also be obtained by means of the friction between the lever 18 and the outer wall of the outer tube 13, such as... Figure 6 The second return spring 19 shown is a compression spring. The second return spring 19 pushes the lever 18 outward, so that there is a predetermined positive pressure between the lever and the outer wall of the outer tube 13.
[0085] As mentioned earlier, disposable temperature probes are prefabricated consumable components, typically made of refractory materials (such as paper tubes or ceramic tubes). Internally, they encapsulate a thermocouple pair that forms the core of the temperature measurement. This thermocouple pair is usually formed by welding or melting two different base metal wires (such as tungsten-rhenium series) at the measuring end to create a hot junction. Electrical insulation and physical fixation between the thermocouple wires and between the thermocouple wires and the external protective tube are achieved through filling with refractory powder (such as alumina).
[0086] The cold junction extension circuit arranged inside the main gun barrel 3 is a standard thermocouple signal transmission system. Its core includes a cold junction compensation circuit composed of a pair of compensating wires. The positive and negative conductor materials of the compensating wire pair are matched in a corresponding ratio so that their thermoelectric characteristics match the thermocouple pair in the front disposable temperature measuring head within the ambient temperature range when the temperature measuring gun is working.
[0087] Basic insulation and connection: The conductor of each compensating wire is covered with a basic insulation layer. The front end of the compensating wire is electrically connected to the cold end of the thermocouple wire led out from the end of the disposable temperature measuring head through a corresponding mechanical terminal block or quick-connect fitting.
[0088] Signal output terminal: The compensation wire starts from the corresponding cold end connection point, passes through the wire channel of the main gun barrel 3, and extends backward. Its tail end terminates at a standard electrical output interface, which is used to output the thermoelectric potential signal to an external display or recording instrument.
[0089] Furthermore, regarding the gun body 7, its rear end has a display and operation terminal 9, and the gun body 7 has a cavity for accommodating a basic circuit board, such as a temperature measurement circuit unit. This basic circuit board includes:
[0090] Signal conditioning unit: An amplifier circuit consisting of low-noise, high-input-impedance operational amplifiers, used to perform preliminary amplification and impedance matching of the weak voltage signal from the front end.
[0091] Analog-to-digital converter: Converts the conditioned and compensated analog voltage signal into a digital signal.
[0092] Main control and computing unit: Embedded basic firmware, which calculates the corresponding target object temperature value based on preset calibration parameters (such as emissivity) and digital signals.
[0093] Display and output interface: typically includes an LCD screen and necessary buttons for displaying temperature measurement results and system parameters.
[0094] The infrared temperature measurement system consists of an infrared sensor 2 located at the front end of the telescopic tube 4. Its core is an infrared detection element, which is encapsulated in a metal cap or similar housing. The front end is usually integrated with an optical window (such as a germanium or silicon wafer). This window has high transmittance for the predetermined infrared band and also serves to protect the internal sensitive elements.
[0095] Part of the circuitry of the second circuit unit is arranged inside the telescopic tube 4, and its core includes:
[0096] Flexible wire pair: This wire pair is directly connected to the output pin of the infrared sensor module and is responsible for transmitting the weak analog signal generated by, for example, infrared sensor 2. To reduce signal attenuation and interference, this wire is usually shielded.
[0097] Compensation element: Depending on the characteristics of, for example, infrared sensor 2, the circuit may integrate a basic negative temperature coefficient thermistor or other reference element required for temperature compensation. Its leads are also laid in the telescopic tube 4 to compensate for the drift of the sensor itself caused by changes in ambient temperature.
[0098] The gun body 7 and the grip 8, which facilitates worker operation, can be integrally injection molded from a flame-retardant ABS+PC alloy. The grip 8 is covered with a non-slip rubber layer. The gun body 7 has an internal metal frame (not shown) to enhance overall strength and is designed with slots and screw posts for mounting the main control circuit board.
[0099] The above description is illustrative in conjunction with the accompanying drawings and is not intended to limit the scope of this utility model. Within the concept of this utility model, the above embodiments or different embodiments can be combined without conflict. Although the utility model has been described in detail in the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A temperature measuring gun for ductile iron ladles, characterized in that, include: The gun body has a built-in temperature measurement circuit unit; The main barrel has one end connected to the gun body and the other end used to install a temperature measuring head. The temperature measuring head is equipped with a thermocouple pair. The main tube cavity of the main barrel is used to pass through a first cable, which is used to connect the thermocouple pair to the temperature measuring circuit unit. The secondary barrel assembly is arranged in parallel with the main barrel, with one end connected to the gun body and the other end equipped with a non-contact temperature measuring element. The secondary barrel cavity of the secondary barrel assembly is used to pass through a second cable, which is used to connect the non-contact temperature measuring element to the temperature measuring circuit unit.
2. The temperature measuring gun for ductile iron ladle according to claim 1, characterized in that, The secondary barrel assembly includes: The secondary barrel is fixedly connected to the gun body at one end and forms an access port at the other end; The telescopic tube is nested at its tail end into the secondary barrel and guided by the secondary barrel; the telescopic tube and the secondary barrel achieve telescopic extension and retraction and holding after telescopic adjustment based on predetermined damping, or achieve telescopic adjustment and position locking after telescopic adjustment based on the sleeve formed by nesting and combined with locking components.
3. The temperature measuring gun for ductile iron ladle according to claim 2, characterized in that, The secondary barrel is a single-layer or double-layer barrel structure; If it is a single-layer pipe structure, the telescopic pipe is guided by the inner wall of the single pipe or by the guide strip formed on the inner wall of the single pipe; If it is a double-layered tube structure, the telescopic tube is guided by the inner tube in the double-layered tube.
4. The temperature measuring gun for ductile iron ladle according to claim 2 or 3, characterized in that, The secondary barrel assembly is provided with a reset device for resetting the telescopic tube forward. Accordingly, an adjustment hole extending axially from the secondary barrel assembly is provided on the tube wall of the secondary barrel assembly, and an actuating part connected to the telescopic tube and having an extension extending out of the adjustment hole is provided to adjust the extension amount of the telescopic tube.
5. The temperature measuring gun for ductile iron ladles according to claim 4, characterized in that, The actuating part is a locking screw or a lever; When using a lever, the lever and the telescopic tube are connected by a second spring guide post, and the second spring adapted to the second spring guide post is a tension spring.
6. The temperature measuring gun for ductile iron ladles according to claim 4, characterized in that, The reset device is a first compression spring; The telescopic tube is provided with an annular push block at its tail end. One end of the first compression spring is supported by the annular push block, and the other end is supported by an annular protrusion or cover inside the secondary barrel.
7. The temperature measuring gun for ductile iron ladle according to claim 1, characterized in that, The temperature measuring head includes a refractory material encapsulation body and a thermocouple pair embedded in the encapsulation body; The package has leads or connectors at the tail end.
8. The temperature measuring gun for ductile iron ladle according to claim 1, characterized in that, The gun body has a display and operation terminal at the rear end.
9. The temperature measuring gun for ductile iron ladle according to claim 1 or 8, characterized in that, The gun body is equipped with a grip on the lower side of the rear end.
10. The temperature measuring gun for ductile iron ladles according to claim 9, characterized in that, The gun body and the grip are integrally injection molded; The injection-molded body that forms the gun body has a skeleton.