Equipment for monitoring and controlling temperature difference of welded steel plates in real time

Abstract

The utility model provides equipment for monitoring and controlling temperature difference of welded steel plates in real time, which comprises a heat-conducting oil storage device, one side of the heat-conducting oil storage device is connected with an electric heating device, the other side of the heat-conducting oil storage device is connected with a heat-conducting oil circulating pipeline, and the heat-conducting oil circulating pipeline is sequentially connected with a circulating pump and a heat-conducting oil heating plate. A hollow oil groove communicated with the heat conduction circulating pipeline is formed in the heat conduction oil heating plate, the heat conduction oil heating plate is connected with an optical fiber sensing temperature monitoring device, and the optical fiber sensing temperature monitoring device and the electric heating device are both connected with a programmable control device. The heating temperature of the steel plate weldment is monitored in real time and regulated in real time; the electric heating device is simple in structure, economical and environment-friendly, heat conduction oil can be recycled, heat energy loss is small in the working process, and the oil temperature can be maintained only with small power after the starting period of the electric heating device.

Description

Technical Field

[0001] The utility model relates to the technical field of steel plate welding, in particular to a method for real-time monitoring and controlling the temperature difference of welded steel plates. Background Art

[0002] When welding steel plates, the initial temperature of the steel plates is relatively low, while the arc temperature during welding is as high as 1250-1300 degrees Celsius. The local temperature at the weld is too different from the temperature of other parts of the steel plate, and the temperature of the steel plate changes suddenly between hot and cold, which causes stress deformation in the heat-affected zone of the weld of the steel plate, a decrease in the strength of the steel plate, and is prone to hot cracks and cold cracks. In current actual production and manufacturing, stress control and crack avoidance of steel plate welding are mostly reflected in the welding process, mainly using positioning welding, multi-layer and multi-pass welding, inspection during welding, and local infrared electric heating and post-weld heat treatment. Although preheating and crack control have been achieved to a certain extent in terms of process technology, there are still problems such as stress concentration of steel plates, difficulty in controlling interlayer temperature, high energy consumption, and insufficient real-time temperature monitoring. Utility Model Content

[0003] The purpose of this utility model is to overcome the deficiencies of the above-mentioned prior art and provide a device for real-time monitoring and control of the temperature difference of welded steel plates, which can solve the problems of stress concentration, difficulty in interlayer temperature control, high energy consumption and insufficient real-time temperature monitoring during steel plate welding.

[0004] To this end, the utility model adopts the following technical solutions:

[0005] 14. The heat transfer oil storage device as claimed in claim 13, wherein the heat transfer oil storage device is connected to an electric heating device, and the electric heating device is used to heat the heat transfer oil in the heat transfer oil storage device; the heat transfer oil storage device is connected to a heat transfer oil circulation pipe on the other side, and the two ends of the heat transfer oil circulation pipe are respectively connected to the oil outlet and the oil inlet of the heat transfer oil storage device; the heat transfer oil circulation pipe is connected to a circulation pump and a heat transfer oil heating plate in sequence, the circulation pump is located between the oil outlet of the heat transfer oil storage device and the heat transfer oil heating plate, the heat transfer oil heating plate is provided with a hollow oil tank connected to the heat transfer circulation pipe, and the heat transfer oil heating plate is used to heat the steel plate weldment; the heat transfer oil heating plate is connected to a fiber optic sensing temperature monitoring device, and the fiber optic sensing temperature monitoring device is used to monitor the temperature of the heat transfer oil heating plate in real time; the fiber optic sensing temperature monitoring device and the electric heating device are both connected to a programmable control device, and the programmable control device is used to receive temperature feedback from the fiber optic sensing temperature monitoring device and to regulate the power of the electric heating device in real time.

[0006] On the basis of adopting the above technical solutions, the present invention may also adopt the following further technical solutions, or use these further technical solutions in combination:

[0007] The optical fiber sensing temperature monitoring device includes an optical fiber connector, which is connected to the thermal oil heating plate. The optical fiber connector is used to monitor the temperature of the thermal oil heating plate in real time and feed the data back to the optical fiber sensing temperature monitoring device.

[0008] The thermal oil heating plate includes two upper and lower heating plates, each of which is hollow inside and is connected to the heat circulation pipe respectively, and the steel plate weldment is placed between the two heating plates.

[0009] A control valve is respectively provided between each heating plate and the circulation pump.

[0010] An exhaust device is also connected to the heat transfer circulation pipeline, and the exhaust device is located between the heat transfer oil heating plate and the oil inlet of the heat transfer oil storage device. The exhaust device is communicated with the heat transfer circulation pipeline, and an oil recovery tank is provided on one side of the exhaust device. One end of the exhaust device is communicated with the oil recovery tank through an exhaust pipe. A pipeline valve is provided on the exhaust pipe, and the pipeline valve is used to control the exhaust volume of the exhaust pipe of the exhaust device, thereby controlling the leakage of gas generated under high temperature and high pressure. The oil recovery tank is used to recover overflowed oil separated by the exhaust device.

[0011] The thermal oil storage device is also connected to a heat exchanger, which is connected to a cooling box and a compressor in sequence through a cooling pipe. An expansion valve is provided on the cooling pipe, and the expansion valve is located between the cooling box and the heat exchanger. A refrigerant is provided in the cooling box, and the refrigerant is used to cool the steel plate weldment. After absorbing heat, the refrigerant enters the heat exchanger through the cooling pipe and the compressor to release heat. The heat exchanger is used to transport heat to the thermal oil storage device for auxiliary heating. After heat release, the refrigerant returns to the cooling box via the expansion valve and the cooling pipe.

[0012] The thermal oil storage device, the circulating pump, the thermal oil heating plate, the exhaust device and the oil recovery tank are all located in the working box. The working box is made of heat-insulating and high-temperature resistant materials to reduce internal heat loss.

[0013] The heating temperature of the thermal oil heating plate is between 220°C and 250°C.

[0014] Compared with the prior art, the utility model has the following advantages and beneficial effects: by arranging an electric heating device, a programmable control device and an optical fiber sensing temperature monitoring device, real-time monitoring and immediate regulation of the heating temperature of the steel plate weldment can be achieved; it is economical and environmentally friendly, the heat transfer oil can be recycled and reused, and its heat energy is less lost during operation, and the electric heating device only needs a small power to maintain the oil temperature after the startup period; the heat transfer oil heating plate is heated evenly and has small thermal inertia, and heat is efficiently transferred to the steel plate weldment that needs to be preheated. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the present utility model. DETAILED DESCRIPTION

[0016] In order to enable those skilled in the art to better understand the technical solution of the present invention, the preferred implementation scheme of the present invention is described below in conjunction with specific embodiments. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar numbers throughout represent elements with the same or similar functions. However, it should be understood that the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. In order to better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted, and the positional relationship described in the drawings is only used for illustrative purposes and cannot be understood as limiting the present invention.

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0018] The utility model provides a device for real-time monitoring and control of the temperature difference of welding steel plates, comprising a heat transfer oil storage device 1, one side of the heat transfer oil storage device 1 is connected to an electric heating device 2, the electric heating device 2 is used to heat the heat transfer oil in the heat transfer oil storage device 1; the other side of the heat transfer oil storage device 1 is connected to a heat transfer oil circulation pipe 4, the two ends of the heat transfer oil circulation pipe 4 are respectively connected to the oil outlet and the oil inlet of the heat transfer oil storage device 1, the heat transfer circulation pipe 4 is sequentially connected to a circulation pump 3 and a heat transfer oil heating plate 7, the circulation pump 3 is located at the outlet of the heat transfer oil storage device 1 Between the oil port and the thermal oil heating plate 7, a hollow oil tank connected to the heat circulation pipe 4 is provided inside the thermal oil heating plate 7, and the thermal oil heating plate 7 is used to heat the steel plate weldment 15; the thermal oil heating plate 7 is connected to a fiber optic sensing temperature monitoring device 9, and the fiber optic sensing temperature monitoring device 9 is used to monitor the temperature of the thermal oil heating plate 7 in real time; the fiber optic sensing temperature monitoring device 9 and the electric heating device 2 are both connected to a programmable control device 8, and the programmable control device 8 is used to receive temperature feedback from the fiber optic sensing temperature monitoring device 9 and adjust the power of the electric heating device 2 in real time.

[0019] In this embodiment, the thermal oil circulation pipe 4 uses a 20# steel pipe in accordance with GB / T 8163 and is insulated and sealed with 500°C anaerobic adhesive. One end of the thermal oil circulation pipe 4 is connected to the oil outlet of the thermal oil storage device 1, and the other end of the thermal oil circulation pipe 4 is connected to the oil inlet of the thermal oil storage device 1. Oil circulation is achieved through the circulation pump 3.

[0020] The optical fiber sensing temperature monitoring device 9 includes an optical fiber connector 91 , which is connected to the thermal oil heating plate 7 . The optical fiber connector 91 is used to monitor the temperature of the thermal oil heating plate 7 in real time and feed the data back to the optical fiber sensing temperature monitoring device 9 .

[0021] The thermal oil heating plate 7 includes two upper and lower heating plates. Each heating plate is hollow inside and is connected to the heat circulation pipe 4 respectively. The steel plate weldment 15 is placed between the two heating plates.

[0022] A control valve 41 is provided between each heating plate and the circulation pump 3 .

[0023] An exhaust device 5 is also connected to the heat transfer circulation pipeline 4. The exhaust device 5 is located between the heat transfer oil heating plate 7 and the oil inlet of the heat transfer oil storage device 1. The exhaust device 5 is communicated with the heat transfer circulation pipeline 4. An oil recovery tank 16 is provided on one side of the exhaust device 5. One end of the exhaust device 5 is communicated with the oil recovery tank 16 through an exhaust pipe. A pipeline valve 6 is provided on the exhaust pipe. The pipeline valve 6 is used to control the exhaust volume of the exhaust pipe of the exhaust device 5, thereby controlling the leakage of gas generated under high temperature and high pressure. The oil recovery tank 16 is used to recover the overflowed oil separated by the exhaust device 5.

[0024] In one embodiment, the thermal oil storage device 1 is also connected to a heat exchanger 13, and the heat exchanger 13 is connected to a cooling box 11 and a compressor 12 in sequence through a cooling pipe. An expansion valve 14 is provided on the cooling pipe, and the expansion valve 14 is located between the cooling box 11 and the heat exchanger 13. A refrigerant is provided in the cooling box 11, and the refrigerant is used to cool the steel plate weldment 15. After absorbing heat, the refrigerant enters the heat exchanger 13 through the cooling pipe and the compressor 12 to release heat. The heat exchanger 13 is used to transport heat to the thermal oil storage device 1 for auxiliary heating. After the heat release is completed, the refrigerant returns to the cooling box 11 via the expansion valve 14 and the cooling pipe.

[0025] By providing the cooling box 11 , the welded steel plate weldment 15 can be slowly cooled, thereby reducing cold cracks generated by a sudden drop in temperature of the steel plate weldment 15 after welding.

[0026] By providing the compressor 12 and the heat exchanger 13, the heat lost by the steel plate weldment 15 can be recovered and the recovered heat can be transported to the thermal oil storage device 1 to assist in heating the thermal oil therein, thereby reducing heat loss.

[0027] The thermal oil storage device 1, the circulating pump 3, the thermal oil heating plate 7, the exhaust device 5 and the oil recovery tank 16 are all located in the working box 10. The working box 10 is made of heat-insulating and high-temperature resistant materials to reduce internal heat loss.

[0028] By providing a heat-insulating and sealed working box 10, the temperature of the steel plate weldment 15 after welding can be maintained, thereby avoiding sudden temperature drops and reducing the temperature difference between the heat-affected zone of the weld and other parts.

[0029] The heating temperature of the thermal oil heating plate 7 is between 220° C. and 250° C. In this embodiment, the heating temperature of the thermal oil heating plate 7 is selected to be 220° C.

[0030] The method of using the utility model comprises the following steps:

[0031] 1. Turn on the electric heating device 2 to heat the thermal oil in the thermal oil storage device 1, open the oil outlet and oil return valves of the thermal oil storage device 1 and start the circulation pump 3, so that the thermal oil enters the thermal oil circulation pipeline and starts circulating to release heat;

[0032] Second, place the steel plate weldment 15 in the thermal oil heating plate 7 for preheating. The optical fiber sensing temperature monitoring device 9 includes an optical fiber connector 91. The optical fiber connector 91 is connected to the junction of the thermal heating plate 7 and the steel plate weldment 15. The optical fiber connector 91 feeds back the monitored temperature data to the optical fiber sensing temperature monitoring device 9 in real time. The temperature data should be between 220°C and 250°C.

[0033] 3. The optical fiber sensing temperature monitoring device 9 feeds back the temperature data to the programmable control device 8 in real time. When the temperature data monitored in step 2 is not between 220°C and 250°C, the programmable control device 8 adjusts the power of the electric heating device 2 in real time, thereby heating the thermal oil in the thermal oil storage device 1, thereby controlling the heating temperature of the thermal heating plate 7 within an appropriate range;

[0034] 4. After the steel plate weldment 15 is preheated, it is taken out from the heat conduction heating plate 7 and welded;

[0035] 5. Place the welded steel plate weldment 15 into the cooling box 11. The refrigerant in the cooling box 11 absorbs heat from the steel plate weldment 15, thereby cooling the steel plate weldment 15. The refrigerant after absorbing heat enters the heat exchanger 13 through the cooling pipe and the compressor 12 to release heat. After the heat release is completed, the refrigerant returns to the cooling box 11 through the expansion valve 14 and the cooling pipe to work. The heat in the heat exchanger 13 is transported to the thermal oil storage device 1 for auxiliary heating.

[0036] According to the description and drawings of the present invention, those skilled in the art can easily manufacture or use the device of the present invention for real-time monitoring and controlling the temperature difference of welded steel plates, and can produce the positive effects described in the present invention.

[0037] It should be noted that the terms "including" and "having" in the specification and claims of the present invention and the above-mentioned drawings, as well as any variations thereof, are intended to cover non-exclusive inclusions. The terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two mechanisms, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0038] In the description of this utility model, it should be understood that terms such as "one end," "the other end," "outer side," "inner side," "horizontal," "end," "length," "outer end," "left," and "right" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are used solely to facilitate the description of this utility model and to simplify the description. They do not indicate or imply that the mechanisms or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. The terms "first" and "second" are used solely for brevity of description and do not indicate or imply relative importance.

[0039] Furthermore, in practicing the claims of the present invention, those skilled in the art may understand and effect variations to the disclosed embodiments by studying the drawings, the disclosure, and the appended claims. Furthermore, in the claims and the specification, words such as "comprising" and "including" do not exclude other elements or steps, and non-plural nouns do not exclude their plural forms.

[0040] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. All equivalent changes and modifications made based on the present invention are covered by the scope of the claims of the present invention and will not be listed one by one here.

Claims

1. A device for real-time monitoring and control of temperature difference of welded steel plates, characterized in that: The invention comprises a thermal oil storage device (1), one side of which is connected to an electric heating device (2), and the electric heating device (2) is used to heat the thermal oil in the thermal oil storage device (1); the other side of the thermal oil storage device (1) is connected to a thermal oil circulation pipe (4), the two ends of the thermal oil circulation pipe (4) are respectively connected to the oil outlet and the oil inlet of the thermal oil storage device (1), and the thermal oil circulation pipe (4) is connected to a circulation pump (3) and a thermal oil heating plate (7) in sequence, and the circulation pump (3) is located between the oil outlet of the thermal oil storage device (1) and the thermal oil heating plate (7). The heat transfer oil heating plate (7) is provided with a hollow oil tank connected to the heat transfer oil circulation pipe (4), and the heat transfer oil heating plate (7) is used to heat the steel plate weldment (15); the heat transfer oil heating plate (7) is connected to a fiber optic sensing temperature monitoring device (9), and the fiber optic sensing temperature monitoring device (9) is used to monitor the temperature of the heat transfer oil heating plate (7) in real time; the fiber optic sensing temperature monitoring device (9) and the electric heating device (2) are both connected to a programmable control device (8), and the programmable control device (8) is used to receive temperature feedback from the fiber optic sensing temperature monitoring device (9) and to regulate the power of the electric heating device (2) in real time.

2. The device for real-time monitoring and controlling the temperature difference of welded steel plates according to claim 1, characterized in that: The optical fiber sensing temperature monitoring device (9) comprises an optical fiber connector (91), wherein the optical fiber connector (91) is connected to the thermal oil heating plate (7), and the optical fiber connector (91) is used to monitor the temperature of the thermal oil heating plate (7) in real time and feed the data back to the optical fiber sensing temperature monitoring device (9).

3. The device for real-time monitoring and controlling the temperature difference of welded steel plates according to claim 1, characterized in that: The thermal oil heating plate (7) comprises two upper and lower heating plates, each of which is hollow inside and is connected to the thermal oil circulation pipe (4). A steel plate weldment (15) is placed between the two heating plates.

4. The device for real-time monitoring and controlling the temperature difference of welded steel plates according to claim 3, characterized in that: A control valve (41) is provided between each heating plate and the circulation pump (3).

5. The device for real-time monitoring and controlling the temperature difference of welded steel plates according to claim 1, characterized in that: The heat transfer oil circulation pipeline (4) is also connected to an exhaust device (5), the exhaust device (5) is located between the heat transfer oil heating plate (7) and the oil inlet of the heat transfer oil storage device (1), the exhaust device (5) is communicated with the heat transfer oil circulation pipeline (4), an oil recovery tank (16) is provided on one side of the exhaust device (5), one end of the exhaust device (5) is communicated with the oil recovery tank (16) through an exhaust pipe, a pipeline valve (6) is provided on the exhaust pipe, the pipeline valve (6) is used to control the exhaust volume of the exhaust pipe of the exhaust device (5), thereby controlling the leakage of gas generated under high temperature and high pressure, and the oil recovery tank (16) is used to recover the overflowed oil separated by the exhaust device (5).

6. The device for real-time monitoring and controlling the temperature difference of welded steel plates according to claim 1, characterized in that: The thermal oil storage device (1) is further connected to a heat exchanger (13), which is connected to a cooling box (11) and a compressor (12) in sequence through a cooling pipe. An expansion valve (14) is provided on the cooling pipe. The expansion valve (14) is located between the cooling box (11) and the heat exchanger (13). A refrigerant is provided in the cooling box (11), and the refrigerant is used to cool the steel plate weldment (15). After absorbing heat, the refrigerant enters the heat exchanger (13) through the cooling pipe and the compressor (12) to release heat. The heat exchanger (13) is used to transport heat to the thermal oil storage device (1) for auxiliary heating. After the heat release is completed, the refrigerant returns to the cooling box (11) via the expansion valve (14) and the cooling pipe.

7. The device for real-time monitoring and controlling the temperature difference of welded steel plates according to claim 5, characterized in that: The thermal oil storage device (1), the circulating pump (3), the thermal oil heating plate (7), the exhaust device (5) and the oil recovery tank (16) are all located in a working box (10). The working box (10) is made of heat-insulating and high-temperature-resistant materials, thereby reducing internal heat loss.

8. The device for real-time monitoring and controlling the temperature difference of welded steel plates according to claim 1, characterized in that: The heating temperature of the thermal oil heating plate (7) is between 220°C and 250°C.

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