Automatic sample adding device for intermediate frequency furnace melting and cleaning

Abstract

This invention relates to the field of metallurgical machinery technology and discloses an automatic sample feeding device for molten medium-frequency furnaces. The device includes a medium-frequency furnace, a sample feeding assembly, a temperature sensor for detecting the smelting temperature of the medium-frequency furnace, and a control device. Both the medium-frequency furnace and the temperature sensor are signal-connected to the control device. The sample feeding assembly includes a hopper, an opening assembly for controlling the opening and closing of the hopper, and a power assembly for moving the hopper. Both the opening assembly and the power assembly are signal-connected to the control device. The automatic sample feeding device for molten medium-frequency furnaces provided by this invention achieves automatic sample addition. Compared to manual sample feeding, it reduces workload, increases sampling efficiency, and avoids the harmful gases generated during molten metal addition that could endanger workers' health, making operation safer.

Description

Technical Field

[0001] This invention relates to the field of metallurgical machinery technology, and more specifically, to an automatic sampling device for melting and cleaning in a medium-frequency furnace. Background Technology

[0002] Shredded scrap steel is inexpensive and readily available in the market, making it suitable for steelmaking. To control the quality of shredded scrap steel, it is necessary to sample and disassemble the briquettes for testing. Typically, a 1kg sample of scrap steel is weighed and tested using a medium-frequency furnace melting method.

[0003] Currently, the crucible capacity used for the medium-frequency furnace melting and cleaning method is relatively small. A 1kg scrap steel sample cannot be added to the crucible at once. Workers need to observe the melting temperature of the crucible and add samples multiple times, which is labor-intensive and has low sample addition and testing efficiency. Melting and cleaning usually takes 15-20 minutes, and the harmful gases produced during melting and cleaning can damage the health of workers. It is difficult to meet the melting and cleaning inspection needs of about 20 samplings per day.

[0004] In summary, how to improve the sampling efficiency of the medium-frequency furnace melting and cleaning method is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide an automatic sample adding device for medium-frequency furnace melting, which realizes automatic addition of molten sample, reduces workload, increases sample adding efficiency, avoids the harm of harmful gases generated during melting to the health of workers, and makes operation safer.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An automatic sampling device for melting in a medium-frequency furnace includes a medium-frequency furnace, a sampling assembly, a temperature sensor for detecting the melting temperature of the medium-frequency furnace, and a control device. The medium-frequency furnace and the temperature sensor are both signal-connected to the control device.

[0008] The sample feeding assembly includes a hopper, an opening assembly for controlling the opening and closing of the hopper, and a power assembly for moving the hopper. Both the opening assembly and the power assembly are signal-connected to the control device.

[0009] Preferably, the power assembly includes a rotating gear, a drive gear, and a drive motor. The rotating gear is rotatably mounted on the top of the fixed column, and the drive gear is mounted on the output shaft of the drive motor.

[0010] The gear portion of the rotating gear meshes with the drive gear, and at least one hopper is provided on the outer edge of the connecting portion of the rotating gear. The hopper is connected to the connecting portion via a rotating arm.

[0011] Preferably, the output shaft of the drive motor and / or the shaft of the rotating gear are provided with an angle sensor for detecting the rotation angle.

[0012] Preferably, the bottom of the hopper is provided with a movable gate, the movable gate includes a gate and a rotating part, the rotating part is hinged to the mounting plate outside the hopper, and the end of the rotating part that is relatively away from the gate is provided with a sliding groove;

[0013] The opening assembly includes a push rod and a linear power mechanism for pushing the push rod, wherein the push rod is provided with a limiting protrusion that engages with the slide groove.

[0014] Preferably, at least one push rod mounting seat is provided below the rotating arm, and the push rod is installed in the mounting hole of the push rod mounting seat;

[0015] The push rod is provided with a fixed baffle at the end that is relatively far away from the hopper. The linear power mechanism includes an opening cylinder installed on the side wall of the fixed column. The push rod of the opening cylinder is positioned directly opposite the fixed baffle.

[0016] A reset spring is provided between the rotating part and the push rod mounting base to drive the movable gate plate to reset.

[0017] Preferably, it also includes a protective cover coaxially arranged with the crucible of the medium frequency furnace. The protective cover is slidably fitted onto the outside of the guide column via a guide sleeve. The guide sleeve is connected to the free end of the lifting power mechanism, and the lifting power mechanism is signal-connected to the control device.

[0018] When material needs to be added, the control device controls the protective cover to descend to a low position along the guide column so that the hopper can be placed inside the protective cover.

[0019] Preferably, when the protective cover is in the low position, the power component is in a safety interlock state, and the control device does not issue movement commands to the power component.

[0020] Preferably, the temperature sensor includes a laser thermometer, which is located at the top of the guide post.

[0021] Preferably, the lifting power mechanism includes a lifting power cylinder, the fixed end of which is connected to the guide column via a cylinder mounting bracket, and the free end of which is connected to the guide sleeve.

[0022] Preferably, the lifting power cylinder is equipped with a magnetic switch for limiting the height of the protective cover.

[0023] The automatic sample feeding device for medium-frequency furnace melting and cleaning provided by this invention first places part of the molten sample into the crucible of the medium-frequency furnace, and the remaining part into the hopper. Then, the control device controls the medium-frequency furnace to be powered on, and the molten sample in the crucible begins to melt. When the temperature sensor detects that the melting temperature has reached the first preset temperature T1, the control device controls the power component to move the hopper above the crucible and controls the hopper opening component to open the hopper, allowing the sample in the hopper to fall into the crucible. After unloading, the control device controls the hopper opening component to close the hopper and controls the power component to move the hopper away. The above process is repeated until all samples are placed in the crucible for melting. When the temperature sensor detects that the melting temperature has reached the second preset temperature T2, the control device controls the medium-frequency furnace to stop, completing one melting and cleaning process.

[0024] Therefore, the automatic sample adding device for medium frequency furnace melting provided by the present invention realizes the automatic addition of molten sample. Compared with manual sample adding, it has less workload, higher sample adding efficiency, and avoids the harmful gases generated by melting from endangering the health of workers, making the operation safer. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0026] Figure 1 A schematic diagram of a specific embodiment of the automatic sampling device for melting and cleaning of medium-frequency furnaces provided by the present invention;

[0027] Figure 2 for Figure 1 A top-down view;

[0028] Figure 3 This is a schematic diagram showing the opening and closing states of the movable gate of the silo.

[0029] Figures 1-3 middle:

[0030] 1 is an intermediate frequency furnace, 101 is a crucible, 2 is a fixed column, 3 is a power component, 301 is a drive motor, 302 is a drive gear, 303 is a rotary gear, 4 is a rotating arm, 401 is a push rod mounting base, 5 is a hopper, 501 is a movable gate, 5011 is a gate, 5012 is a rotating part, 6 is an opening assembly, 601 is a push rod, 602 is an opening cylinder, 603 is a return spring, 7 is a protective cover, 8 is a guide column, 9 is a guide sleeve, 10 is a lifting power cylinder, 11 is a laser thermometer, and 12 is a control device. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] The core of this invention is to provide an automatic sample adding device for medium-frequency furnace melting, which realizes automatic addition of molten sample, reduces workload, increases sample adding efficiency, and avoids the harm to workers' health caused by harmful gases generated during melting, making operation safer.

[0033] The automatic sampling device for melting and cleaning of medium frequency furnace provided by the present invention includes a medium frequency furnace 1, a sampling component, a temperature sensor for detecting the melting temperature of the medium frequency furnace 1, and a control device 12. The medium frequency furnace 1 and the temperature sensor are both connected to the control device 12 via signal.

[0034] The sample feeding assembly includes a hopper 5, an opening assembly 6 for controlling the opening and closing of the hopper 5, and a power assembly 3 for moving the hopper 5. Both the opening assembly 6 and the power assembly 3 are connected to the control device 12 via signals.

[0035] Please refer to Figure 1 The medium-frequency furnace 1 includes a medium-frequency furnace main unit and a crucible 101 for holding the molten sample. A heating coil is provided outside the crucible 101. The heating coil is connected to the medium-frequency furnace main unit through a conductive tube. The specific type and power of the medium-frequency furnace 1 are determined according to the actual production needs, and will not be described in detail here.

[0036] In order to detect the melting temperature inside the medium frequency furnace 1, the automatic sampling device is equipped with a temperature sensor. Considering the service life and measurement accuracy of the temperature sensor, the temperature sensor is usually not located inside the crucible 101, but is set above the crucible 101 by a sensor bracket, and the melting temperature of the crucible 101 below is measured by infrared, laser or other means.

[0037] The number of temperature sensors can be set to one, two, or more. To ensure that the temperature sensors can accurately reflect the melting temperature distribution inside the crucible 101, when there is only one temperature sensor, the temperature sensor is usually located on the axis of the crucible 101. When there is more than one temperature sensor, multiple temperature sensors are evenly distributed along the circumference of the axis of the crucible 101.

[0038] In addition, when the number of temperature sensors is greater than one, the actual melting temperature can be either the lowest value measured by each temperature sensor or the average value measured by each temperature sensor.

[0039] Preferably, the temperature sensor may include a laser thermometer 11, which is located at the top of the guide post 8.

[0040] Due to the limited capacity of the existing crucible 101, multiple samples need to be added during the scrap steel sample melting process. The specific quantity and capacity of the silo 5 are determined based on the sample quality detected in a single melting process during actual production and the capacity of the crucible 101.

[0041] For example, each melting process requires adding 1kg of scrap steel sample to crucible 101. Since the capacity of crucible 101 is 250g, an automatic sample adding device can be set up with 4 hoppers 5 of equal capacity, and the capacity of each hopper 5 is greater than or equal to 250g.

[0042] In order to control the automatic opening and closing of the hopper 5, the automatic sampling device is equipped with an opening component 6, the structure of which is related to the opening method of the hopper 5.

[0043] For example, if the movable gate 501 at the bottom of the hopper 5 is horizontally slidably connected to the hopper body, the opening assembly 6 can be set as a linear displacement mechanism that drives the movable gate 501 to slide horizontally.

[0044] If the movable gate 501 at the bottom of the hopper 5 is hinged to the hopper body, the opening assembly 6 can be set as a rotating mechanism that drives the movable gate 501 to rotate around the axis, or it can be set as a linear displacement mechanism connected to one end of the movable gate 501, using the linear displacement mechanism to push the movable gate 501 to rotate around the axis.

[0045] Since the automatic sampling device has multiple hoppers 5, in order to facilitate the hoppers 5 to move above the crucible 101 for sampling and to automatically leave after sampling, the automatic sampling device is equipped with a power component 3 for moving the hoppers 5. The type of power component 3 is related to the distribution of the hoppers 5.

[0046] The hoppers 5 can be set on the same straight line or on the same concentric circle. If the hoppers 5 are set on the same straight line, the power assembly 3 can be set as a common linear displacement mechanism such as a linear guide assembly or a ball screw assembly. If the hoppers 5 are set on the same concentric circle, the power assembly 3 can be set as a rotary power mechanism such as a gear assembly or a sprocket assembly.

[0047] The temperature sensor, the opening assembly 6, and the power assembly 3 are all connected to the control device 12 so that the control device 12 can determine whether a sample needs to be added based on the actual melting temperature, and when a sample needs to be added, control the hopper 5 to be above the crucible 101 and automatically open the hopper to add the sample.

[0048] In use, firstly, part of the molten sample is placed into the crucible 101 of the medium-frequency furnace 1, and the remaining part is placed into the hopper 5. Then, the control device 12 controls the medium-frequency furnace 1 to be powered on, and the molten sample in the crucible 101 begins to melt. When the temperature sensor detects that the melting temperature has reached the first preset temperature T1, the control device 12 controls the power component 3 to move the hopper 5 above the crucible 101, and controls the opening component 6 to open the hopper 5, allowing the sample in the hopper 5 to fall into the crucible 101. After unloading, the control device 12 controls the opening component 6 to close the hopper 5, and controls the power component 3 to move the hopper 5 away. The above process is repeated until all samples are placed into the crucible 101 for melting. When the temperature sensor detects that the melting temperature has reached the second preset temperature T2, the control device 12 controls the medium-frequency furnace 1 to stop, completing one melting and cleaning process.

[0049] The first preset temperature T1 and the second preset temperature T2 can be built into the control device 12, or they can be manually input by the user according to the specific type of sample to be melted.

[0050] In this embodiment, the automatic sample addition device for medium frequency furnace melting and cleaning realizes the automatic addition of melting samples. Compared with manual sample addition, it has less workload, higher sample addition efficiency, and avoids the harmful gases generated by melting and cleaning from endangering the health of workers, making the operation safer.

[0051] Based on the above embodiments, the structure of the power component 3 is further defined. The power component 3 may include a rotating gear 303, a drive gear 302 and a drive motor 301. The rotating gear 303 is rotatably sleeved on the top of the fixed column 2, and the drive gear 302 is sleeved on the output shaft of the drive motor 301.

[0052] The gear part of the rotating gear 303 meshes with the drive gear 302. The outer edge of the connecting part of the rotating gear 303 is provided with at least one hopper 5, and the hopper 5 is connected to the connecting part through the rotating arm 4.

[0053] Please refer to Figure 1 The rotating gear 303 includes an upper connecting part and a lower gear part. To ensure that the center of gravity of the rotating gear 303 is located on its axis, the connecting part and the gear part are coaxially arranged. The hoppers 5 are evenly distributed along the circumferential direction of the axis of the rotating gear 303.

[0054] The outer diameter of the connecting part can be as follows Figure 1 The outer diameter shown is larger than that of the gear part, but it can also be equal to or smaller than the outer diameter of the connecting part.

[0055] The specific tooth profile and transmission ratio of the gear section of the rotary gear 303 and the drive gear 302, as well as the type and power of the drive motor 301, are determined based on the needs of actual production and with reference to existing technologies, and will not be elaborated here.

[0056] For easier mounting of drive motor 301, please refer to... Figure 1 The drive motor 301 is connected to the side wall of the fixed column 2 via a motor mounting bracket.

[0057] When the hopper 5 needs to be moved, the control device 12 controls the drive motor 301 to rotate, which drives the drive gear 302 sleeved on the output shaft of the drive motor 301 to rotate, which in turn drives the rotating gear 303 meshing with the drive gear 302 to rotate, and finally drives the rotating arm 4 connected to the rotating gear 303 to rotate.

[0058] Preferably, in order to accurately control the position of the hopper 5, an angle sensor for detecting the rotation angle can be provided on the output shaft of the drive motor 301 and / or the rotating shaft of the rotating gear 303. The angle sensor can be specifically set as an encoder, etc.

[0059] When the angle sensor is installed on the output shaft of the drive motor 301, the angle sensor can measure the rotation angle of the drive gear 302, and the rotation angle of the rotary gear 303 can be calculated and determined according to the transmission ratio between the rotary gear 303 and the drive gear 302.

[0060] When the angle sensor is placed on the rotating shaft of the rotating gear 303, the angle sensor can directly measure the rotation angle of the rotating gear 303.

[0061] Based on the above embodiments, the bottom of the hopper 5 is provided with a movable gate 501. The movable gate 501 includes a gate 5011 and a rotating part 5012. The rotating part 5012 is hinged to the mounting plate outside the hopper 5. The end of the rotating part 5012 that is relatively far away from the gate 5011 is provided with a sliding groove.

[0062] The opening assembly 6 includes a push rod 601 and a linear power mechanism for pushing the push rod 601. The push rod 601 is provided with a limiting protrusion that is engaged in the slide groove.

[0063] Please refer to Figure 3 The side wall of the hopper 5 is provided with a protruding mounting plate. The movable gate 501 is hinged to the mounting plate by a pin, so that the movable gate 501 can rotate around the pin.

[0064] The movable gate 501 includes a gate 5011 for closing the bottom of the hopper 5 and a rotating part 5012 for connecting with the push rod 601. One end of the push rod 601 is engaged in the groove of the rotating part 5012, and the other end is set directly opposite the free end of the linear power mechanism.

[0065] When the hopper needs to be opened, the control device 12 controls the linear power mechanism to push the rotating part 5012 to move towards the side wall of the hopper 5. The movable gate 501 rotates counterclockwise around the axis, so that the gate 5011 is relatively far away from the bottom of the hopper 5. At this time, the sample can fall from the hopper 5.

[0066] The movable gate 501 can be reset manually by the user, or a reset spring 603 can be provided between the rotating part 5012 and the side wall of the hopper 5, or between the push rod 601 and the side wall of the hopper 5, or between the push rod 601 and the fixed end of the linear motion mechanism. The elastic restoring force of the reset spring 603 can be used to drive the movable gate 501 to reset.

[0067] Based on the above embodiments, the connection relationship between the push rod 601 and the linear motion mechanism is defined. At least one push rod mounting seat 401 can be provided below the rotating arm 4, and the push rod 601 is installed in the mounting hole of the push rod mounting seat 401.

[0068] The push rod 601 is provided with a fixed baffle at the end that is relatively far away from the hopper 5. The linear power mechanism includes an opening cylinder 602 installed on the side wall of the fixed column 2. The push rod of the opening cylinder 602 is set directly opposite the fixed baffle.

[0069] A reset spring 603 is provided between the rotating part 5012 and the push rod mounting base 401 to drive the movable gate 501 to reset.

[0070] Please refer to Figure 1 The lower part of the rotating arm 4 is provided with a push rod mounting seat 401. The center of the push rod mounting seat 401 is provided with a mounting hole. The push rod mounting seat 401 is mostly set as a plate-shaped structure or a block-shaped structure.

[0071] One end of the push rod 601 is slidably engaged in the groove of the rotating part 5012, and the other end is set on the fixed baffle. The fixed baffle is set directly opposite the push rod of the opening cylinder 602 to ensure that the thrust of the opening cylinder 602 is better applied to the push rod 601. The fixed baffle can be set as any geometric shape such as a rectangular plate or a circular plate.

[0072] A return spring 603 is provided between the rotating part 5012 and the push rod mounting base 401. One end of the return spring 603 is connected to the rotating part 5012, and the other end is connected to the end of the push rod mounting base 401 that is closer to the hopper 5.

[0073] When the hopper needs to be opened, the control device 12 controls the extension of the push rod of the opening cylinder 602. The push rod pushes the movable gate 501 to rotate counterclockwise around the pin shaft, so that the rotating part 5012 is relatively close to the side wall of the hopper 5 and the gate 5011 is relatively far away from the bottom of the hopper 5. The sample falls from the hopper 5 into the crucible 101. At this time, the reset spring 603 is stretched and accumulates elastic potential energy.

[0074] After the material is unloaded from the hopper 5, the control device 12 controls the push rod of the opening cylinder 602 to retract and reset. The push rod of the opening cylinder 602 disengages from the fixed baffle of the push rod 601, and the push rod 601 is no longer subjected to the pushing force of the opening cylinder 602. Under the action of the elastic restoring force of the reset spring 603, the movable gate 501 rotates clockwise around the pin shaft, so that the rotating part 5012 is relatively away from the side wall of the hopper 5, and the gate 5011 is relatively close to the bottom of the hopper 5, until the gate 5011 closes the bottom of the hopper 5 again.

[0075] In this embodiment, the reset spring 603 enables the hopper 5 to automatically reset after opening, eliminating the need for manual adjustment by the user. This simplifies operation, saves time, and also helps reduce the collision between the movable gate 501 and other structures during transfer.

[0076] Based on the above embodiments, the automatic sample feeding device may also include a protective cover 7 coaxially arranged with the crucible 101 of the medium frequency furnace 1. The protective cover 7 is slidably fitted onto the guide post 8 through a guide sleeve 9. The guide sleeve 9 is connected to the free end of the lifting power mechanism, and the lifting power mechanism is signal connected to the control device 12.

[0077] When material needs to be added, the control device 12 controls the protective cover 7 to descend to a low position along the guide column 8, so that the hopper 5 can be placed inside the protective cover 7. Figure 1 As shown.

[0078] It should be noted that even when the protective cover 7 is in a low position, the height of the protective cover 7 should not affect the normal operation of the opening component 6, power component 3, and other structures. Its specific height is determined based on the structure and dimensions of the hopper 5, opening component 6, and power component 3 in actual production.

[0079] Please refer to Figure 1 The protective cover 7 is a cylindrical structure with the upper and lower parts connected so that the laser of the laser thermometer 11 can pass smoothly through the inside of the protective cover 7. The protective cover 7 is placed outside the material hopper 5 to isolate the high temperature generated by the melting and cleaning of the sample by the crucible 101 to a certain extent, so as to protect the material hopper 5 and extend the service life of the material hopper 5.

[0080] When adjusting the height of the protective cover 7, the control device 12 can control the free end of the lifting power mechanism to rise and fall along the height direction of the guide column 8, thereby driving the guide sleeve 9 to rise and fall along the height direction of the guide column 8, and finally driving the protective cover 7 to rise and fall along the height direction of the guide column 8.

[0081] The lifting power mechanism can be specifically set as a common linear displacement mechanism such as an electric push rod, hydraulic cylinder, or pneumatic cylinder. Preferably, the lifting power mechanism can include a lifting power cylinder 10. The fixed end of the lifting power cylinder 10 is connected to the guide column 8 through a cylinder mounting bracket, and the free end of the lifting power cylinder 10 is connected to the guide sleeve 9. The structure is simple and the cost is low.

[0082] To limit the travel of the protective cover 7, preferably, the lifting power cylinder 10 is equipped with a magnetic switch for limiting the height of the protective cover 7. The magnetic switch is used to control the high and low positions of the protective cover 7.

[0083] Based on the above embodiments, in order to avoid collision between the protective cover 7 and the hopper 5, the power component 3 can be set to be in a safety interlock state when the protective cover 7 is in a low position, and the control device 12 will not issue a movement command to the power component 3.

[0084] Therefore, when the protective cover 7 is in a low position, the control device 12 does not control the displacement of the hopper 5 to avoid collision or movement interference between the two; when the protective cover 7 is in a high position, the control device 12 sends a movement command to the power component 3 to drive the hopper 5 to move.

[0085] In a specific embodiment, the automatic sampling device is provided with four material bins 5. The material bins 5 are evenly distributed on the outer edge of the rotating gear 303 via the rotating arm 4. When the medium frequency furnace 1 is started and stopped, the angle bisector of two adjacent material bins 5 located below the protective cover 7 is located in the vertical plane where the axis of the protective cover 7 is located.

[0086] When in use, first place part of the molten sample into the crucible 101 of the medium frequency furnace 1, and place the remaining part into the hopper 5. The control device 12 controls the medium frequency furnace 1 to be powered on, and the molten sample in the crucible 101 begins to melt.

[0087] When the temperature sensor detects that the melting temperature has reached the first preset temperature T1, the control device 12 controls the power component 3 to drive the hopper 5 to rotate 45° and move it above the crucible 101. Then, the control device 12 controls the lifting rod power cylinder 10 to retract, driving the protective cover 7 to descend from the high position to the low position. Then, the control device 12 controls the opening cylinder 602 to push the push rod 601, so that the rotating part 5012 rotates and the gate 5011 at the bottom of the hopper 5 opens, and the sample in the hopper 5 falls into the crucible 101.

[0088] After unloading is completed, the control device 12 controls the push rod of the opening cylinder 602 to retract, and the movable gate 501 automatically resets under the action of the reset spring 603. Then, the control device 12 controls the lifting power cylinder 10 to drive the protective cover 7 to rise to the high position. Then, the control device 12 controls the power component 3 to drive the hopper 5 to rotate 45° in the same direction.

[0089] Repeat the above process until all samples are placed in crucible 101 for melting.

[0090] When the temperature sensor detects that the melting temperature has reached the second preset temperature T2, the control device 12 controls the intermediate frequency furnace 1 to stop, completing one melting and cleaning process.

[0091] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0092] The above provides a detailed description of the automatic sampling device for melting and cleaning in a medium-frequency furnace provided by this invention. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. An automatic sampling device for melting and cleaning in a medium-frequency furnace, characterized in that, It includes an intermediate frequency furnace (1), a sample feeding assembly, a temperature sensor for detecting the melting temperature of the intermediate frequency furnace (1), and a control device (12), wherein the intermediate frequency furnace (1) and the temperature sensor are both signal connected to the control device (12); The sample feeding assembly includes a hopper (5), an opening assembly (6) for controlling the opening and closing of the hopper (5), and a power assembly (3) for moving the hopper (5). The opening assembly (6) and the power assembly (3) are both signal connected to the control device (12). The power assembly (3) includes a rotating gear (303), a drive gear (302) and a drive motor (301). The rotating gear (303) is rotatably mounted on the top of the fixed column (2), and the drive gear (302) is mounted on the output shaft of the drive motor (301). The gear part of the rotating gear (303) meshes with the drive gear (302), and at least one of the material bins (5) is provided on the outer edge of the connecting part of the rotating gear (303). The material bins (5) are connected to the connecting part through the rotating arm (4). An angle sensor for detecting rotation angle is provided on the output shaft of the drive motor (301) and / or the shaft of the rotary gear (303); The bottom of the hopper (5) is provided with a movable gate (501). The movable gate (501) includes a gate (5011) and a rotating part (5012). The rotating part (5012) is hinged to the mounting plate outside the hopper (5). The end of the rotating part (5012) that is relatively away from the gate (5011) is provided with a sliding groove. The opening assembly (6) includes a push rod (601) and a linear power mechanism for pushing the push rod (601), wherein the push rod (601) is provided with a limiting protrusion that engages with the slide groove.

2. The automatic sampling device for medium-frequency furnace melting and cleaning according to claim 1, characterized in that, At least one push rod mounting seat (401) is provided below the rotating arm (4), and the push rod (601) is installed in the mounting hole of the push rod mounting seat (401). The push rod (601) is provided with a fixed baffle at the end that is relatively far away from the hopper (5). The linear power mechanism includes an opening cylinder (602) installed on the side wall of the fixed column (2). The push rod of the opening cylinder (602) is set directly opposite the fixed baffle. A reset spring (603) is provided between the rotating part (5012) and the push rod mounting base (401) for driving the movable gate (501) to reset.

3. The automatic sampling device for melting and cleaning in a medium-frequency furnace according to claim 1 or 2, characterized in that, It also includes a protective cover (7) coaxially arranged with the crucible (101) of the medium frequency furnace (1). The protective cover (7) is slidably sleeved on the outside of the guide column (8) through the guide sleeve (9). The guide sleeve (9) is connected to the free end of the lifting power mechanism. The lifting power mechanism is signal connected to the control device (12). When material needs to be added, the control device (12) controls the protective cover (7) to descend to a low position along the guide column (8) so that the hopper (5) can be covered inside the protective cover (7).

4. The automatic sampling device for melting and cleaning in a medium-frequency furnace according to claim 3, characterized in that, When the protective cover (7) is in a low position, the power assembly (3) is in a safety interlock state, and the control device (12) does not issue a motion command to the power assembly (3).

5. The automatic sampling device for melting and cleaning in a medium-frequency furnace according to claim 3, characterized in that, The temperature sensor includes a laser thermometer (11), which is located on the top of the guide post (8).

6. The automatic sampling device for melting and cleaning in a medium-frequency furnace according to claim 3, characterized in that, The lifting power mechanism includes a lifting power cylinder (10), the fixed end of the lifting power cylinder (10) is connected to the guide column (8) through a cylinder mounting bracket, and the free end of the lifting power cylinder (10) is connected to the guide sleeve (9).

7. The automatic sampling device for melting and cleaning in a medium-frequency furnace according to claim 6, characterized in that, The lifting power cylinder (10) is equipped with a magnetic switch for limiting the height of the protective cover (7).

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