Abstract: A method analyzes global average grayscale change of tundish ink tracing experiment. The method includes the following steps: building a water model based on a prototype size and production parameters of a tundish; carrying out experiments by using the water model to obtain a video file of the ink tracing; processing the video file and extracting a characteristic curve of a global average grayscale changing with the time; analyzing the characteristic curve, and extracting a global peak grayscale time, a global tracer residual volume and a global emptying time as indicators for evaluating a tundish structure and flow characteristics of the tundish structure.

Abstract: A method analyzes global average grayscale change of tundish ink tracing experiment. The method includes the following steps: building a water model based on a prototype size and production parameters of a tundish; carrying out experiments by using the water model to obtain a video file of the ink tracing; processing the video file and extracting a characteristic curve of a global average grayscale changing with the time; analyzing the characteristic curve, and extracting a global peak grayscale time, a global tracer residual volume and a global emptying time as indicators for evaluating a tundish structure and flow characteristics of the tundish structure.

Abstract: A method for predicting floating times of inclusions during refinements of molten steel includes: predicting a macroscopic multiphase flow field of the molten steel refining, injecting the inclusions into the multiphase flow field uniformly and randomly, determining a capture condition of the inclusions, calculating motion trajectories of the inclusions injected into the multiphase flow field, outputting captured inclusions' information through comparing the motion trajectory of the inclusion and the capture condition, and obtaining an average floating time, a relationship between a removal rate and the floating time, and the complete floating time through analyzing the captured inclusions' information.

Abstract: Disclosed example systems include: a collecting device, a weighing device, and a control device. The collecting device is disposed in a cooling zone, and is configured to collect contaminants. The collecting device is mounted on the weighing device. The weighing device is configured to weigh the collecting device to obtain weight information of the collecting device. The control device is configured to determine whether the reflow oven needs to be cleaned based on the weight information of the collecting device. The method comprises collecting contaminants in a cooling zone by a collecting device, weighing the collecting device to obtain weight information of the collecting device, and determining whether the reflow oven needs to be cleaned based on the weight information of the collecting device.

Abstract: The present disclosure discloses a reflow oven, comprising a heating zone, a cooling zone, a barrier and exhaust zone, a gas exhaust passage, a gas exhaust power device, and a detection device. The heating zone comprises a heating zone inlet and a heating zone outlet. The cooling zone comprises a cooling zone inlet and a cooling zone outlet. The barrier and exhaust zone is located between the heating zone outlet and the cooling zone inlet. An inlet of the gas exhaust passage is communicated with the barrier and exhaust zone. The gas exhaust power device is disposed on the gas exhaust passage. The detection device is disposed on the gas exhaust passage and used for detecting parameters of gas in the gas exhaust passage, wherein the parameters of the gas reflect a blockage condition of the gas exhaust power device.

Abstract: The present application provides a cleaning frame, for keeping a waste gas purification apparatus (150) in a cleaning solution, the waste gas purification apparatus comprising an end plate (132) and a connecting component (131) located above the end plate, and the cleaning frame comprising a bottom (101) and a sidewall (103). The bottom is provided with a channel running through the bottom. The sidewall is formed by upward extension from the bottom around the channel; the sidewall and the bottom enclose a holding cavity. The cleaning frame is configured such that the waste gas purification apparatus can be kept floating in the cleaning solution by the cleaning frame, and the sidewall (103) of the cleaning frame can at least partially float above the surface of the cleaning solution, so as to isolate the connecting component of the waste gas purification apparatus from the cleaning solution.

Abstract: The present application discloses a gas control system for a reflow oven, a hearth thereof comprising a preheating zone, a peak zone and a cooling zone. The gas control system comprises: an oxygen detection apparatus, a first valve apparatus, a second valve apparatus and a controller. The controller is configured to control the degree of opening of the first valve apparatus and/or the second valve apparatus when the oxygen concentration detected by the oxygen detection apparatus does not satisfy a preset value, in order to enable the oxygen concentration in the peak zone to satisfy the preset value by adjusting the flow rate of working gas and/or air inputted into the peak zone. The gas control system and reflow oven of the present application first perform rough adjustment of gas in the hearth, such that the oxygen concentration in the hearth is substantially close to the preset value.

Abstract: The present disclosure discloses a reflow oven, comprising a heating zone, a cooling zone, a barrier and exhaust zone, a gas exhaust passage, a gas exhaust power device, and a detection device. The heating zone comprises a heating zone inlet and a heating zone outlet. The cooling zone comprises a cooling zone inlet and a cooling zone outlet. The barrier and exhaust zone is located between the heating zone outlet and the cooling zone inlet. An inlet of the gas exhaust passage is communicated with the barrier and exhaust zone. The gas exhaust power device is disposed on the gas exhaust passage. The detection device is disposed on the gas exhaust passage and used for detecting parameters of gas in the gas exhaust passage, wherein the parameters of the gas reflect a blockage condition of the gas exhaust power device.

Abstract: The present application discloses a fitting apparatus (100) for fitting a sealing member (110) onto a solder paste nozzle (230), the sealing member having a sealing member mounting hole (112), and the fitting apparatus comprising: a support plate (116); at least two first power sources (101, 102, 103, 104); at least two insertion members (121) and a second power source (105). By controlling the driving directions and driving sequence of multiple power sources, the fitting apparatus of the present application completes the work of expanding the sealing member mounting hole in a mechanical fashion; an operator then only needs to pass the base plate of the nozzle through the sealing member mounting hole in order to complete the fitting of the sealing member to the nozzle, so the operation is convenient and saves manpower.

Abstract: An oxygen content detection system, comprising: a zirconia analyser, an air source, a mass flow valve and a first throttle valve. The zirconia analyser comprises: a signal processing apparatus, a housing and a probe.

Abstract: The present disclosure discloses a reflow oven, comprising a heating zone, a cooling zone, a barrier and exhaust zone, a gas exhaust passage, a gas exhaust power device, and a detection device. The heating zone comprises a heating zone inlet and a heating zone outlet. The cooling zone comprises a cooling zone inlet and a cooling zone outlet. The barrier and exhaust zone is located between the heating zone outlet and the cooling zone inlet. An inlet of the gas exhaust passage is communicated with the barrier and exhaust zone. The gas exhaust power device is disposed on the gas exhaust passage. The detection device is disposed on the gas exhaust passage and used for detecting parameters of gas in the gas exhaust passage, wherein the parameters of the gas reflect a blockage condition of the gas exhaust power device.

Abstract: The present disclosure discloses an exhaust gas purification device for purifying exhaust gas in a reflow oven hearth, the exhaust gas purification device comprising: a filtering unit; a filtering component provided in the filtering unit; a controllable gas passage that controllably communicates an interior of the filtering unit with an external environment containing oxygen, the controllable gas passage being configured to controllably introduce gas containing oxygen into the filtering unit; a heating component provided in the filtering unit, wherein the heating component is configured to be capable of heating the gas in the filtering unit to an oxidation temperature at which carbon in adherent substances on the filtering component is capable of chemically reacting to produce a gas. The exhaust gas purification device of the present disclosure has a long maintenance period, which can greatly reduce the maintenance cost.

Abstract: The present disclosure discloses a reflow oven for processing a circuit board, the reflow oven comprising a heating zone, a plurality of heating devices and a start-stop device. The heating zone comprises a plurality of heating sub-zones, the plurality of heating devices are arranged in corresponding heating sub-zones of the plurality of heating sub-zones, and each of the plurality of heating devices is configured such that a working temperature of the corresponding heating sub-zone is in a predetermined temperature interval.