On-line measuring device for welding temperature of welded pipe

Abstract

The application discloses a kind of welded pipe welding temperature on-line measuring device, the device includes the support for being set to the upper of welded pipe welding equipment, support plate and the vertical driving device for driving support plate to move up and down are installed on support, vertical driving device is installed on support by transverse driving device;The support plate is installed in the driving end of vertical driving device, detection plate is also installed on support plate, temperature measuring sensor for on-line measuring welded pipe welding temperature and distance measuring sensor for measuring the distance between temperature measuring sensor and welded pipe are installed on detection plate, detection plate is installed on support plate by support shaft, power equipment for driving support shaft to drive detection plate to swing adjustment is also installed on support plate.This application can accurately, real-time measure welded pipe welding temperature, so as to adjust welding parameter in time, guarantee welded pipe quality.

Description

Technical Field

[0001] This utility model relates to the field of welded pipe welding technology, and in particular to an online temperature measurement device for welded pipe welding. Background Technology

[0002] In welded pipe production, welding temperature is one of the key parameters affecting weld quality. A suitable welding temperature ensures the strength, toughness, and sealing of the weld, preventing defects such as incomplete penetration, overheating, and cracks. In the existing technological system, thermocouples and resistance temperature detectors (RTDs) are commonly used temperature measurement methods. These two sensors, with their mature technology and relatively stable performance, have been applied to a certain extent in the field of welded pipe temperature measurement. However, they also reveal significant limitations in practical applications: their structures are usually relatively fixed, and their positions are difficult to adjust flexibly after installation. During welded pipe production, due to the diversity of welding processes and the continuous changes in welded pipe specifications, the welding position and heat source distribution may dynamically change. However, existing thermocouple or RTD temperature measurement devices cannot adjust accordingly to these changes, always measuring temperature in a fixed posture and position. This leads to the inability to accurately capture the true temperature of the welding area in some cases, resulting in measurement data deviations, which in turn affects the accurate assessment and control of weld quality, making it difficult to fully meet the demands of modern welded pipe production for high-precision and highly adaptable temperature measurement. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an online welding temperature measuring device for welded pipes that can accurately and in real time measure the welding temperature of welded pipes, so as to adjust the welding parameters in a timely manner and ensure the quality of welded pipes, in order to overcome the shortcomings of the existing technology.

[0004] The technical problem to be solved by this utility model is achieved through the following technical solution. This utility model is an online welding temperature measurement device for welded pipes. The device includes a bracket positioned directly above the welded pipe welding equipment. A support plate and a vertical drive device for driving the support plate to move up and down are mounted on the bracket. The vertical drive device is mounted on the bracket via a horizontal drive device. The support plate is mounted on the drive end of the vertical drive device. A horizontally positioned detection plate is also mounted on the support plate. A temperature sensor for online measurement of the welded pipe welding temperature and a distance sensor for measuring the distance between the temperature sensor and the welded pipe are mounted on the detection plate. The detection plate is mounted on the support plate via a support shaft. A power device for driving the support shaft to swing and adjust the detection plate is also mounted on the support plate.

[0005] The technical problem to be solved by this utility model can also be further achieved through the following technical solution: For the above-mentioned online measurement device for welded pipe welding temperature, the vertical driving device is an electric push rod, which is installed upside down and the support plate is installed on the push rod end of the electric push rod.

[0006] The technical problem to be solved by this utility model can also be further achieved through the following technical solution: For the online measurement device for welding temperature of welded pipe described above, the horizontal driving device is a ball screw, the vertical driving device is installed on the nut of the ball screw, the screw of the ball screw is installed on the bracket through bearings and bearing seats, and a reduction motor that is connected to the screw of the ball screw is also installed on the bracket.

[0007] The technical problem to be solved by this utility model can also be further achieved through the following technical solution: for the above-mentioned online temperature measurement device for welded pipes, the temperature sensor is an infrared temperature sensor and the distance sensor is a laser distance sensor.

[0008] The technical problem to be solved by this utility model can also be further achieved through the following technical solution: for the above-mentioned online measurement device for welded pipe welding temperature, the power equipment is a servo motor, and the motor shaft of the servo motor is connected to the support shaft for transmission.

[0009] The technical problem to be solved by this utility model can also be further achieved through the following technical solution: For the above-mentioned online welding temperature measurement device for welded pipes, a control box is also installed on the bracket, and a PLC controller is installed in the control box. The vertical drive device, the horizontal drive device, and the power device are all connected to the output terminal of the PLC controller, and the temperature sensor and the distance sensor are all connected to the input terminal of the PLC controller.

[0010] The technical problem to be solved by this utility model can also be further achieved through the following technical solution: For the above-mentioned online measurement device for welded pipe welding temperature, a display screen and an audible and visual alarm connected to the PLC controller are also installed on the control box.

[0011] The technical problem to be solved by this utility model can also be further achieved through the following technical solution: For the above-mentioned online measurement device for welded pipe welding temperature, a wireless communication module is also installed in the control box to facilitate the connection between the PLC controller and the external host computer.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1. Precise real-time temperature measurement: By integrating a high-precision temperature sensor, this device can accurately and in real-time measure the temperature of the welding area of ​​the welded pipe, providing key data support for the welding process;

[0014] 2. Dynamic distance compensation: This utility model utilizes a distance sensor to monitor the distance between the temperature sensor and the welded pipe in real time, which facilitates timely adjustment of the position of the temperature sensor to effectively eliminate the influence of distance changes on temperature measurement accuracy and ensure the accuracy of measurement results;

[0015] 3. Flexible spatial positioning: Through the setting of vertical drive equipment, horizontal drive equipment and power equipment, this device can realize flexible positioning in three-dimensional space (lifting up and down, horizontal translation, swing adjustment), adapt to the needs of welded pipes of different specifications and complex welding processes, and improve the versatility of measurement.

[0016] 4. Advantages of non-contact measurement: This utility model adopts a non-contact temperature measurement method, avoiding the problems of traditional contact sensors being easily affected by welding spatter, electromagnetic interference, etc., and significantly improving the reliability and service life of the device. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of one structure of the present utility model. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] Reference Figure 1 An online temperature measurement device for welded pipes employs three-dimensional spatial positioning and non-contact sensing technology to achieve real-time and accurate temperature monitoring during the welding process. Its features include:

[0020] The device includes a bracket 1 for mounting directly above the pipe welding equipment 2. The bracket 1 is made of high-strength aluminum alloy or carbon steel and is treated with anti-corrosion coating to ensure long-term stable operation in high temperature and high humidity welding environment. The bottom of the bracket 1 is designed with adjustable anchor bolts for easy on-site installation and leveling.

[0021] A support plate and a vertical drive device 8 for driving the support plate to move up and down are mounted on the bracket 1. The vertical drive device 8 is mounted on the bracket 1 via a horizontal drive device. The support plate is mounted on the drive end of the vertical drive device 8. A horizontally arranged detection plate 6 is also mounted on the support plate. A temperature sensor 4 for online measurement of the welding temperature of the welded pipe 3 and a distance sensor 5 for measuring the distance between the temperature sensor 4 and the welded pipe 3 are mounted on the detection plate 6. The vertical drive device 8 drives the support plate and the detection plate 6 to move the temperature sensor 4 and the distance sensor 5 vertically to achieve height adjustment. Preferably, the vertical drive device 8... The driving device 8 is an electric push rod, which is installed upside down, and the support plate is installed on the push rod end of the electric push rod; the horizontal driving device is used to drive the vertical driving device 8 to move horizontally, so as to realize the horizontal position adjustment of the temperature sensor 4 and the distance sensor 5. Preferably, the horizontal driving device is a ball screw, and the vertical driving device 8 is installed on the nut 10 of the ball screw. The screw 9 of the ball screw is installed on the bracket 1 through a bearing and a bearing seat. A geared motor 11 that is connected to the screw 9 of the ball screw is also installed on the bracket 1. In order to ensure stability, a guide structure, such as a guide rod and a guide sleeve, is also installed between the nut 10 of the ball screw and the bracket.

[0022] To further improve temperature measurement accuracy, the detection plate 6 is mounted on a support plate via a support shaft. A power device 7 is also installed on the support plate to drive the support shaft and adjust the swing of the detection plate 6. The power device 7 is used to adjust the swing of the detection plate 6 as needed, thereby adjusting the angle of the temperature sensor 4. Preferably, the power device 7 is a servo motor, with its motor shaft connected to the support shaft via a transmission connection, such as by meshing transmission gears installed on the motor shaft and the support shaft.

[0023] Preferably, the temperature sensor 4 is an infrared temperature sensor, such as a high-precision infrared temperature sensor (e.g., Melexis MLX90614), with a temperature measurement range of 50-1200℃ and a response time of ≤50ms. A silicon nitride protective film can also be added to the surface of the infrared temperature sensor lens to prevent welding spatter and metal dust contamination. The transmittance of the protective film is ≥95%, ensuring the accuracy of temperature measurement. The distance sensor 5 is a laser distance sensor, such as (e.g., Sharp GP2Y0A21YK0F), with a distance measurement range of 10-80cm and a resolution of 1cm.

[0024] In actual use, to better achieve measurement and control, a control box 12 is also installed on the bracket 1. A PLC controller is installed in the control box. The vertical drive device 8, the horizontal drive device, and the power device 7 are all connected to the output terminal of the PLC controller. The temperature sensor 4 and the distance sensor 5 are all connected to the input terminal of the PLC controller. Preferably, a high-performance PLC controller is selected, such as the Siemens S7-1200 series, CPU model 1214C DC / DC / DC, integrating 14DI / 10DO, 2AI / 2AO, supporting PROFINET communication, and having a program storage capacity of 100KB. This meets the requirements of multi-axis linkage control and complex logic processing. The start, stop, and direction of the electric push rod and servo motor are controlled through the digital output module. The voltage signal of the distance sensor 5 is collected through the analog input module. The infrared temperature sensor 4 is communicated through the RS485 interface.

[0025] The control box 12 is also equipped with a display screen 13 and an audible and visual alarm 14 connected to the PLC controller. The display screen 13 is a 7-inch TFT LCD touch screen (such as Kunlun Tongtai TPC7062Ti) with a resolution of 800×480. It supports the MODBUS TCP protocol and displays temperature measurement data, distance measurement data, equipment status and alarm information in real time. The audible and visual alarm 14 is a combined alarm (such as AD16-22SM) with an alarm volume ≥105dB and programmable light color (red / yellow / green). The alarm output is controlled by the DO point of the PLC controller.

[0026] The control box 12 is also equipped with a wireless communication module that facilitates the connection between the PLC controller and an external host computer. The wireless communication module is connected to the PLC via an RS485 bus and uploads temperature measurement data and equipment status to the cloud platform or host computer software (such as SCADA system) in real time. It supports remote parameter configuration and firmware upgrades, making it convenient for workers to remotely view the welding temperature of the welded pipe 3.

[0027] The workflow for this application is as follows:

[0028] 1. Initialization Phase

[0029] After the PLC is powered on, the detection board is moved to a safe position by the horizontal drive device, and the temperature sensor is adjusted to the initial height (e.g., 30cm from the surface of the welded pipe) by the vertical drive device.

[0030] The distance sensor is activated to measure the distance to the surface of the welded pipe in real time. The compensation coefficient is calculated by the PLC to calibrate the temperature measurement data.

[0031] 2. Measurement Phase

[0032] After welding begins, the PLC dynamically adjusts the position of the detection plate according to the preset welding process parameters (such as pipe specifications and welding speed) through the vertical and horizontal drive devices to ensure that the temperature sensor is always aligned with the center of the weld.

[0033] Infrared temperature sensors collect temperature data in real time, and PLC filters the data (such as moving average filtering) to eliminate the effects of welding spatter and electromagnetic interference.

[0034] When the temperature reading exceeds a preset threshold (e.g., 1200℃), the PLC triggers an audible and visual alarm and sends an alarm message to the host computer via a wireless communication module.

[0035] 3. Data storage and analysis

[0036] The PLC stores temperature measurement data, distance measurement data, and alarm records to a local SD card (capacity ≥32GB) and simultaneously uploads them to the host computer via a wireless communication module.

[0037] The host computer can analyze historical data and generate temperature curves and statistical reports, providing data support for welding process optimization. (The host computer software used can be implemented by those skilled in the art. For example, the host computer software is developed based on the .NET Framework and supports functions such as centralized monitoring of multiple devices, historical data query, report generation, and alarm threshold setting. It communicates with the PLC through the OPC UA protocol to achieve bidirectional data interaction and supports remote access via mobile APP (VPN or edge computing gateway needs to be configured).

[0038] This device achieves intelligent monitoring of the welding temperature of welded pipes through full-process management, including installation and commissioning, pre-welding preparation, real-time monitoring, data analysis, and equipment maintenance. Its core advantage lies in:

[0039] 1. High precision: Non-contact temperature measurement and dynamic compensation technology ensure temperature error ≤ ±1℃;

[0040] 2. High reliability: Multi-level alarm and emergency stop mechanisms ensure welding quality and equipment safety;

[0041] 3. High efficiency: Data is automatically stored and analyzed, reducing manual intervention and improving production efficiency;

[0042] 4. Applicable to welding quality control in fields such as welded pipe manufacturing, petrochemicals, and aerospace.

Claims

1. An online measuring device for welding temperature of welded pipes, characterized in that: The device includes a bracket positioned directly above the pipe welding equipment. A support plate and a vertical drive device for moving the support plate vertically are mounted on the bracket. The vertical drive device is mounted on the bracket via a horizontal drive device. The support plate is mounted on the drive end of the vertical drive device. A horizontally positioned detection plate is also mounted on the support plate. A temperature sensor for online measurement of the pipe welding temperature and a distance sensor for measuring the distance between the temperature sensor and the pipe are mounted on the detection plate. The detection plate is mounted on the support plate via a support shaft. A power device for driving the support shaft to swing and adjust the detection plate is also mounted on the support plate.

2. The online welding temperature measurement device for welded pipes according to claim 1, characterized in that: The vertical drive device is an electric push rod, which is installed upside down, and a support plate is installed on the push rod end of the electric push rod.

3. The online welding temperature measurement device for welded pipes according to claim 1 or 2, characterized in that: The lateral drive device is a ball screw, the vertical drive device is mounted on the nut of the ball screw, the screw of the ball screw is mounted on the bracket through bearings and bearing seats, and a geared motor that is connected to the screw drive of the ball screw is also mounted on the bracket.

4. The online welding temperature measurement device for welded pipes according to claim 1, characterized in that: The temperature sensor is an infrared temperature sensor, and the distance sensor is a laser distance sensor.

5. The online welding temperature measurement device for welded pipes according to claim 1, characterized in that: The power equipment is a servo motor, and the motor shaft of the servo motor is connected to the support shaft via a transmission connection.

6. The online welding temperature measurement device for welded pipes according to claim 1, characterized in that: A control box is also installed on the bracket, and a PLC controller is installed inside the control box. The vertical drive equipment, horizontal drive equipment, and power equipment are all connected to the output terminal of the PLC controller, and the temperature sensor and distance sensor are all connected to the input terminal of the PLC controller.

7. The online welding temperature measurement device for welded pipes according to claim 6, characterized in that: The control box is also equipped with a display screen and an audible and visual alarm that are connected to the PLC controller.

8. The online welding temperature measurement device for welded pipes according to claim 6, characterized in that: The control box also contains a wireless communication module that facilitates connection between the PLC controller and an external host computer.

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