High-frequency brazing machine

Abstract

The invention discloses a high-frequency brazing machine. The high-frequency brazing machine comprises a supporting structure, a machine shell, a control system, a heating module, a driving module and a detection module. The heating module is a high-frequency heating machine, the heating end of the heating module is an induction heating coil extending by a preset distance in the horizontal direction parallel to the top face of the supporting structure, and the heating module is arranged on one side of the top of the supporting structure. The driving module corresponds to and is adjacent to the heating module and is arranged at the top of the supporting structure; a driving end movement range of the driving module covers a heating area of the induction heating coil; the detection module corresponds to and is adjacent to the driving module and is arranged at the top of the supporting structure; the detection range of the detection module covers the driving end movement range of the driving module; the control system is in control connection with the heating module, the driving module and the detection module. According to the high-frequency brazing machine, the heating module is arranged to be the induction heating coil extending by the preset distance in the horizontal direction, and a linear heating area with a certain length is formed.

Description

Technical Field

[0001] This invention relates to the field of brazing machine technology, and in particular to a high-frequency brazing machine. Background Technology

[0002] High-frequency induction brazing is an advanced process that utilizes the principle of high-frequency electromagnetic induction to generate eddy current heat in a localized area of ​​the workpiece to achieve material bonding. Due to its advantages such as rapid heating, small heat-affected zone, ease of automation, and clean, pollution-free operation, this technology is widely used in aerospace, automotive manufacturing, and precision instrument industries, and is particularly suitable for welding heat-sensitive or structurally precise components.

[0003] Traditional high-frequency brazing equipment and processes generally employ a relatively static heating mode: the workpiece to be welded is typically fixed in a specific fixture or clamping mechanism, and then the brazing area on the workpiece is heated at a fixed point and continuously using an induction coil until the solder melts, wets, and completes the connection. However, this traditional mode based on static heating has gradually revealed several inherent defects in practical applications, especially when facing precision welding tasks with stringent requirements for heating uniformity, where its limitations become more pronounced.

[0004] Metallic materials inherently possess thermal inertia, meaning that the transfer of heat within the material is limited in rate and spatially gradient. In static fixed-point heating mode, the heat energy generated by the induction coil is continuously input to a local area of ​​the workpiece. Due to thermal inertia, the heat cannot diffuse uniformly and instantaneously, causing a rapid temperature rise in the local area directly below the coil, while areas further away heat up slowly. This easily leads to uneven heating of the workpiece, manifesting as follows: the area near the center of the coil may become excessively hot due to heat accumulation, posing a risk of overheating, grain coarsening, or even melting of the base material; while the edge areas may suffer from insufficient heat, resulting in incomplete melting of the solder, poor fluidity, and poor wetting, leading to defects such as incomplete soldering or cold solder joints. This severe non-uniformity of the temperature field is a fundamental technical obstacle restricting the consistency and reliability of welded joint quality. Therefore, there is an urgent need in this field for a new type of high-frequency brazing machine and its control method that can fundamentally overcome the problem of uneven heating caused by thermal inertia, achieve precise, uniform, and dynamic heating of the workpiece during the brazing process, and improve the stability, consistency, and process adaptability of welding quality through highly automated and intelligent control. Summary of the Invention

[0005] Therefore, it is necessary to provide a high-frequency brazing machine to address the technical problem of uneven heating of workpieces and solder paste in existing high-frequency brazing machines.

[0006] A high-frequency brazing machine includes a support structure integrating a cooling system, a housing covering the top of the support structure, a control system, a heating module, a drive module, and a detection module mounted on one side of the housing. The heating module is configured as a high-frequency heater, with its heating end being an induction heating coil extending a predetermined distance in a horizontal direction parallel to the top surface of the support structure. The heating module is located on one side of the top of the support structure. The drive module is positioned corresponding to and adjacent to the heating module on the top of the support structure, with its drive end's movement range covering the heating area of ​​the induction heating coil. The detection module is positioned corresponding to and adjacent to the drive module on the top of the support structure, with its detection range covering the movement range of the drive end of the drive module. The control system is connected to the heating module, drive module, and detection module.

[0007] In one embodiment, the driving module and the detection module are respectively disposed on opposite sides of the induction heating coil along its extension direction.

[0008] In one embodiment, the drive module includes a mechanical gripper moving mechanism and a first pneumatic mechanical gripper mounted on its drive end.

[0009] In one embodiment, the mechanical gripper moving mechanism is a dual-axis drive mechanism consisting of a horizontal linear guide rail and a first lifting linear guide rail; the horizontal linear guide rail is mounted parallel to the top surface of the support structure, and its slide moves through the heating area of ​​the induction heating coil; the first lifting linear guide rail is vertically mounted on the slide of the horizontal linear guide rail; the first pneumatic mechanical gripper is mounted on the slide of the first lifting linear guide rail.

[0010] In one embodiment, the detection module is a laser thermometer, which is movably mounted to the support structure via a second lifting linear guide rail, and the detection end of the laser thermometer is positioned facing the working area of ​​the induction heating coil and the first pneumatic mechanical gripper.

[0011] In one embodiment, the slag discharge structure is located on the bottom side of the induction heating coil and mounted on the top surface of the support structure.

[0012] In one embodiment, the slag discharge structure is a guide plate inclined at a preset angle, and the bottom end of the guide plate extends to the outer edge of the top surface of the support structure.

[0013] In one embodiment, the high-frequency brazing machine further includes a clamping unit for clamping another workpiece to be welded. The clamping unit is configured as a second pneumatic gripper, and the second pneumatic gripper is movably mounted to the support structure via a third lifting linear guide rail, and is arranged on the other side of the induction heating coil in conjunction with the first pneumatic mechanical gripper.

[0014] In one embodiment, a level gauge for detecting the liquid level of the cooling system is provided on one side of the support structure.

[0015] In one embodiment, the casing is provided with a hinged door that flips up and down on one side corresponding to the slag discharge structure.

[0016] In one embodiment, the control system is configured to execute the following workflow: controlling the drive module to move the first pneumatic mechanical gripper holding the workpiece coated with solder paste to a preset position at the induction heating coil for preheating; after the preset preheating time is reached, controlling the heating module to adjust the heating current and controlling the drive module to drive the workpiece to reciprocate relative to the induction heating coil for heating; based on the signal from the detection module that the workpiece temperature has reached the melting point of the solder paste, controlling the heating module to stop heating, and the other workpiece held by the clamping unit to mate with the welding end of the workpiece coated with molten solder paste to complete the initial welding, and then controlling the drive module to move the workpiece to a preset cooling position for cooling; after the preset cooling time is reached, the welding process is completed.

[0017] In one embodiment, the sliding direction of the horizontal linear guide rail is parallel to or at a predetermined angle to the extension direction of the induction heating coil.

[0018] The aforementioned high-frequency brazing machine forms a linear heating zone of a certain length by setting the heating module as an induction heating coil extending a preset distance horizontally, rather than a point heat source. Thermal inertia causes a delay and gradient in heat transfer within the workpiece. Therefore, compared to a point heat source, the linear heat source can input energy to a larger axial range of the workpiece in the initial stage, pre-establishing a broader initial temperature field. This helps to mitigate severe temperature unevenness caused by heat diffusion from a single focal point. The drive module's drive end travels over the heating zone of the induction heating coil, clamping the workpiece and moving it along a preset trajectory within this zone. By causing the workpiece to pass through the linear heating zone at a uniform or variable speed, the concentrated, static heating process is transformed into a dispersed, dynamic scanning heating process. Thus, the coil only heats any part of the workpiece. The use of a time-limited heating method, rather than continuous heating, directly avoids the runaway temperature rise caused by continuous energy input at a fixed point. When a part of the workpiece moves out of the strongest induction zone of the coil, due to thermal inertia, the temperature of that part will not drop immediately, but will continue to conduct inward or dissipate through thermal radiation and convection. At the same time, the strategy of the drive module moving the workpiece back and forth can intentionally utilize this "residual heat" to preheat or keep the adjacent area warm, so that the temperature of the entire area to be welded is balanced in time and space, promoting the uniformity of the overall temperature. The three modules of heating, driving, and detection are correspondingly and adjacent to each other on the top of the support structure, thereby shortening the response path and physical distance of thermal management commands. The drive module can quickly position the workpiece to any point in the heating zone, the detection module can capture temperature changes accurately at close range, and the system command transmission is highly efficient. The close collaboration of the three ensures the response speed and control accuracy of using relative motion to homogenize heat and real-time adjustment through feedback to counteract thermal inertia, so that the uniform heating strategy can be effectively implemented. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a high-frequency brazing machine in one embodiment; Figure 2 This is a schematic diagram of the structure of a high-frequency brazing machine in one embodiment; Figure 3 for Figure 2 An enlarged structural diagram of part M in the illustrated embodiment. Detailed Implementation

[0020] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0021] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0026] Please see Figures 1 to 3 This invention discloses a high-frequency brazing machine, which includes a support structure 1 integrating a cooling system, a housing 2 covering the top of the support structure 1, a control system 3 installed on one side of the housing 2, a heating module 4, a drive module 5, and a detection module 6. The heating module 4 is configured as a high-frequency heater, with its heating end being an induction heating coil 41 extending a predetermined distance in a horizontal direction parallel to the top surface of the support structure 1. The heating module 4 is located on one side of the top of the support structure 1. The drive module 5 is located on the top of the support structure 1, corresponding to and adjacent to the heating module 4, and its driving end's movement range covers the heating area of ​​the induction heating coil 41. The detection module 6 is located on the top of the support structure 1, corresponding to and adjacent to the drive module 5, and its detection range covers the movement range of the drive end of the drive module 5. The control system 3 is connected to the heating module 4, the drive module 5, and the detection module 6. The high-frequency brazing machine achieves compact structure and functional integration by centrally mounting the three functional modules of heating, driving, and detection on the top of the support structure 1 and defining their relative positions and ranges of action. The induction heating coil 41 extends horizontally to form a linear heating zone, providing a structural basis for the subsequent drive module 5 to move the workpiece linearly for heating. The control system 3 coordinates all modules, providing hardware support for a fully automated brazing process including preheating, dynamic heating, temperature feedback, and cooling, effectively improving welding consistency and efficiency.

[0027] Furthermore, the drive module 5 and the detection module 6 are respectively positioned opposite each other on both sides of the induction heating coil 41 along its extension direction. This symmetrical or split-side layout, where the drive module 5 (actuator) and the detection module 6 (sensor) are positioned on opposite sides of the induction coil, ensures that they do not interfere with each other spatially, avoiding obstruction of the detection optical path by moving parts or direct impact of thermal radiation on the sensor. Simultaneously, the split-side arrangement facilitates wiring and maintenance, optimizes the utilization of internal space, and makes the structure clearer and more rational.

[0028] Furthermore, the drive module 5 includes a mechanical gripper moving mechanism and a first pneumatic mechanical gripper 51 mounted on its drive end; the mechanical gripper moving mechanism is a dual-axis drive mechanism composed of a horizontal linear guide rail 52 and a first lifting linear guide rail 53; the horizontal linear guide rail 52 is parallel to the top surface of the support structure 1, and its sliding direction extends through the heating area of ​​the induction heating coil 41; the first lifting linear guide rail 53 is vertically mounted on the sliding seat of the horizontal linear guide rail 52; the first pneumatic mechanical gripper 51 is mounted on the sliding seat of the first lifting linear guide rail 53. The high-frequency brazing machine adopts a dual-axis drive mechanism composed of a horizontal guide rail and a lifting guide rail, which gives the first pneumatic mechanical gripper 51 precise and flexible movement capabilities in both the horizontal and vertical directions. Horizontal movement allows it to smoothly drive the workpiece through the heating area to achieve uniform heating; lifting movement facilitates the clamping, positioning, and picking up and placing of the workpiece before and after heating. The pneumatic mechanical gripper provides a stable and reliable clamping force. This structure is a key execution unit for realizing the movement of the workpiece along a preset trajectory and completing the automated brazing process.

[0029] Furthermore, the detection module 6 is a laser temperature sensor, which is movably mounted to the support structure 1 via a second lifting linear guide rail 61, with the detection end of the laser temperature sensor facing the working area of ​​the induction heating coil 41 and the first pneumatic mechanical gripper 51. Laser temperature measurement has the advantages of being non-contact, having a fast response, and being highly accurate, enabling real-time and precise measurement of the surface temperature of the heated workpiece. By adjusting the height of the laser temperature sensor via the second lifting linear guide rail 61, it is possible to flexibly adapt to the temperature measurement requirements of workpieces of different sizes and find the optimal temperature measurement point, ensuring that the temperature measurement range can effectively cover the key areas of the workpiece during the heating process, providing accurate signals for temperature feedback control.

[0030] Furthermore, the high-frequency brazing machine also includes a slag removal structure 7, which is located on the bottom side of the induction heating coil 41 and installed on the top surface of the support structure 1. The slag removal structure 7 is a guide plate inclined at a preset angle, with its bottom end extending to the outer edge of the top surface of the support structure 1. During brazing, impurities such as welding slag, spatter, or detached flux may be generated. The inclined guide plate located below the heating coil can automatically collect these waste materials and allow them to slide down the inclined surface to a predetermined collection point outside the equipment by gravity. This structure effectively prevents the accumulation of waste materials in critical areas of the equipment (such as near the heating coil and on the guide rails), reduces equipment contamination and cleaning and maintenance workload, and ensures the cleanliness and stability of the equipment during long-term operation.

[0031] Furthermore, the high-frequency brazing machine also includes a clamping unit 8 for holding another workpiece to be welded. The clamping unit 8 is configured as a second pneumatic gripper, which is movably mounted to the support structure 1 via a third lifting linear guide rail 81 and is positioned on the other side of the induction heating coil 41 in conjunction with the first pneumatic mechanical gripper 51. The first pneumatic mechanical gripper 51 holds one workpiece for heating, while the second pneumatic gripper holds the other workpiece in a fixed position. The height of the clamped workpiece can be adjusted via the third lifting linear guide rail 81 to ensure precise alignment with the moving heated workpiece. This structure enables dual-station collaborative operation, expanding the equipment's application range, and is particularly suitable for butt brazing processes requiring stable support of one side of the workpiece, improving the accuracy and convenience of welding assembly.

[0032] Furthermore, a level gauge 11 for detecting the coolant level in the cooling system is provided on one side of the support structure 1. Since high-frequency heating equipment generates a large amount of heat during operation, the stable operation of the integrated cooling system (typically water-cooled) is crucial. The external level gauge 11 provides an intuitive and convenient window for observing the coolant level without opening the casing 2 or performing complex operations. Operators can quickly understand the coolant status, replenish it in a timely manner, and prevent equipment overheating damage due to insufficient coolant, greatly improving the convenience of equipment maintenance and operational safety.

[0033] Furthermore, a hinged door 21 with a vertical tilting mechanism is provided on one side of the housing 2 corresponding to the slag discharge structure 7. The hinged door 21 is simple to open and close and occupies little space. Its placement on the corresponding side of the slag discharge structure 7 facilitates quick opening and operation when cleaning accumulated waste at the end of the guide plate or for inspection. Simultaneously, the door 21 also serves as a passage for equipment maintenance and observation; its targeted design further optimizes human-machine interaction and equipment maintainability.

[0034] Furthermore, the control system 3 is configured to execute the following workflow: The drive module 5 is controlled to move the first pneumatic mechanical gripper 51, holding the workpiece coated with solder paste, to a preset position on the induction heating coil 41 for preheating; after a preset preheating time is reached, the heating module 4 is controlled to adjust the heating current, and the drive module 5 is controlled to move the workpiece back and forth relative to the induction heating coil 41 for heating; based on the signal from the detection module 6 that the workpiece temperature has reached the solder paste melting point, the heating module 4 is controlled to stop heating, and the other workpiece held by the clamping unit 8 is mated to the welding end of the workpiece coated with molten solder paste to complete the initial welding; then, the drive module 5 is controlled to move the workpiece to a preset cooling position for cooling; after a preset cooling time is reached, the welding process is completed. Dynamic moving heating helps to utilize thermal inertia to ensure uniform heating of the workpiece and avoid local overheating. Using the detected actual melting point temperature as the trigger signal to stop heating, rather than a fixed time or power, significantly improves the accuracy and adaptability of the welding process control, ensuring the reliability and consistency of welding quality, and is a core method for achieving high-quality automated brazing.

[0035] Furthermore, the sliding direction of the horizontal linear guide 52 is parallel to or at a preset angle to the extending direction of the induction heating coil 41. Parallel alignment is the most common and efficient method, allowing the workpiece to move along the length of the heating coil, resulting in optimal matching of the heating path with the coil shape. Allowing a preset angle provides greater process flexibility. For example, by adjusting the angle, the heating trajectory or velocity component of the workpiece relative to the coil can be changed, thereby achieving better adaptation to complex-shaped workpieces or special heating modes (such as oblique scanning heating), enhancing the equipment's versatility and process adjustment capabilities.

[0036] In summary, the high-frequency brazing machine disclosed in this invention forms a linear heating area of ​​a certain length by setting the heating module as an induction heating coil extending a preset distance in the horizontal direction, rather than a point heat source. Thermal inertia causes a delay and gradient in heat transfer within the workpiece. Therefore, compared to a point heat source, the linear heat source can input energy to a larger axial range of the workpiece in the initial stage, pre-establishing a broader initial temperature field. This helps to mitigate the severe temperature unevenness caused by heat diffusion from a single focus to the surrounding areas. The driving end of the drive module covers the heating area of ​​the induction heating coil, enabling it to clamp the workpiece and move it along a preset trajectory within this area. By making the workpiece pass through the linear heating area at a uniform or variable speed, the concentrated, static heating process is transformed into a dispersed, dynamic scanning heating process. Thus, the coil can provide heat to any part of the workpiece. The heating process only operates for a limited time, rather than providing continuous heating. This directly avoids the runaway temperature rise caused by continuous energy input at a fixed point. When a part of the workpiece moves out of the coil's strongest induction zone, due to thermal inertia, the temperature of that part will not immediately drop, but will continue to conduct inward or dissipate through thermal radiation and convection. At the same time, the strategy of the drive module moving the workpiece back and forth can intentionally utilize this "residual heat" to preheat or keep adjacent areas warm, so that the temperature of the entire area to be welded is balanced in time and space, promoting overall temperature uniformity. The three modules of heating, driving, and detection are correspondingly and adjacent to each other on the top of the support structure, thereby shortening the response path and physical distance of thermal management commands. The drive module can quickly position the workpiece to any point in the heating zone, and the detection module can accurately capture temperature changes at close range, ensuring efficient transmission of control system commands. The close collaboration of the three ensures the response speed and control accuracy of using relative motion to homogenize heat and real-time adjustment through feedback to counteract thermal inertia, enabling the effective execution of the uniform heating strategy.

[0037] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0038] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A high-frequency brazing machine, characterized in that, include: The system includes a support structure with an integrated cooling system, a housing covering the top of the support structure, a control system, a heating module, a drive module, and a detection module installed on one side of the housing. The heating module is configured as a high-frequency heater, and its heating end is an induction heating coil that extends a predetermined distance in a horizontal direction parallel to the top surface of the support structure. The heating module is located on one side of the top of the support structure. The drive module is disposed on the top of the support structure corresponding to and adjacent to the heating module, and the driving end of the drive module has a range of motion covering the heating area of ​​the induction heating coil. The detection module is disposed on the top of the support structure corresponding to and adjacent to the drive module, and the detection range of the detection module covers the movement range of the drive end of the drive module; The control system is connected to the heating module, the drive module, and the detection module respectively.

2. The high-frequency brazing machine according to claim 1, characterized in that, The driving module and the detection module are respectively disposed on both sides of the induction heating coil along its extension direction.

3. The high-frequency brazing machine according to claim 2, characterized in that, The drive module includes a mechanical gripper moving mechanism and a first pneumatic mechanical gripper mounted on its drive end.

4. The high-frequency brazing machine according to claim 3, characterized in that, The mechanical gripper moving mechanism is a dual-axis drive mechanism consisting of a horizontal linear guide rail and a first lifting linear guide rail; the horizontal linear guide rail is mounted parallel to the top surface of the support structure, and its slide moves through the heating area of ​​the induction heating coil; the first lifting linear guide rail is vertically mounted on the slide of the horizontal linear guide rail; the first pneumatic mechanical gripper is mounted on the slide of the first lifting linear guide rail.

5. The high-frequency brazing machine according to claim 4, characterized in that, The detection module is a laser thermometer, which is movably mounted to the support structure via a second lifting linear guide rail, and the detection end of the laser thermometer is positioned facing the working area of ​​the induction heating coil and the first pneumatic mechanical gripper.

6. The high-frequency brazing machine according to claim 5, characterized in that, The slag discharge structure is located on the bottom side of the induction heating coil and installed on the top surface of the support structure.

7. The high-frequency brazing machine according to claim 6, characterized in that, The slag discharge structure is a guide plate with a preset angle, and the bottom end of the guide plate extends to the outer edge of the top surface of the support structure.

8. The high-frequency brazing machine according to claim 7, characterized in that, The high-frequency brazing machine also includes a clamping unit for clamping another workpiece to be welded. The clamping unit is configured as a second pneumatic gripper, and the second pneumatic gripper is movably mounted to the support structure via a third lifting linear guide rail, and is located on the other side of the induction heating coil in conjunction with the first pneumatic mechanical gripper.

9. The high-frequency brazing machine according to claim 8, characterized in that, A level gauge for detecting the liquid level in the cooling system is provided on one side of the support structure.

10. The high-frequency brazing machine according to claim 9, characterized in that, The casing is provided with a hinged door that flips up and down on one side corresponding to the slag discharge structure.

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