Vacuum melting furnace auxiliary material adding device, vacuum melting furnace and auxiliary material adding method

Abstract

The auxiliary material adding device comprises a material storage box and an adding box, and further comprises a weighing box and a feeding port formed in the top in the adding box, the weighing box is located in the adding box and located below the feeding port, a partition plate is fixedly connected into the adding box, and the partition plate is fixedly connected with the feeding port. The inner bottom of the weighing box is communicated with a discharging pipe, a valve is arranged on the discharging pipe, the discharging pipe penetrates through the partition plate, and a weighing assembly is arranged in the adding box and used for weighing auxiliary materials entering the weighing box. The device has the advantages of being capable of achieving precise weighing of auxiliary materials, efficient sealing, negative pressure pretreatment and automatic recycling of redundant materials, meanwhile, the corresponding vacuum melting furnace and an adding method are matched, so that the stability, efficiency and product quality of the vacuum melting technology are improved, and the production requirement of high-quality metal materials is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vacuum melting furnaces, in particular to a vacuum melting furnace auxiliary material adding device, a vacuum melting furnace and an auxiliary material adding method. BACKGROUND

[0002] In the fields of metallurgy and material preparation, a vacuum melting furnace is a key equipment for smelting high-quality metals and alloys because it can isolate air and reduce impurity pollution. Precise addition of auxiliary materials (such as deoxidizers and alloy element additives) directly affects the composition uniformity, purity and mechanical properties of the smelted products, and is an indispensable link in the vacuum smelting process.

[0003] Currently, the auxiliary material addition of the vacuum melting furnace mainly has the following technical pain points: 1. Low weight control accuracy: Traditional auxiliary material addition relies on manual estimation or simple volume measurement, making it difficult to accurately control the amount of each addition. Some systems that use weighing devices may have auxiliary material accumulation or spillage during the conveying process, resulting in a large deviation between the actual weight of the auxiliary material entering the melting furnace and the preset value, which in turn affects the stability of product quality, especially for high-purity alloy smelting, where small weight errors may cause composition to exceed the standard.

[0004] 2. Gas interference with smelting environment: The vacuum melting furnace requires a high vacuum degree in the furnace to avoid the reaction of gases (such as oxygen and nitrogen) with molten metal to generate oxides and nitrides. The existing adding device often fails to seal the addition channel or does not perform negative pressure pretreatment before the auxiliary material is conveyed to the furnace body, resulting in external air entering the furnace along with the auxiliary material, which destroys the vacuum environment and increases the risk of smelting defects. Although some devices have sealing structures, the sealing timing does not match the weighing process, and problems such as "sealing before weighing is completed" or "gas remaining after sealing" may occur.

[0005] 3. Material waste and recycling difficulties: During the auxiliary material conveying process of existing equipment, when the added auxiliary material reaches the preset value, the excess auxiliary material is easily spilled into the internal or external part of the adding device due to the presence of some auxiliary material in the adding device, resulting in material waste and potential device blockage due to auxiliary material accumulation, which increases equipment maintenance costs. Some recycling structures are complex and require additional power to drive, and impurities may be introduced during the recycling process, further affecting the purity of the auxiliary material.

[0006] Therefore, it is necessary to design a vacuum melting furnace auxiliary material adding device, a vacuum melting furnace and an auxiliary material adding method to solve the above problems. SUMMARY

[0007] The application aims to solve the problems in the prior art, and provides a vacuum melting furnace auxiliary material adding device, a vacuum melting furnace and an auxiliary material adding method, which have the advantages of precise auxiliary material weighing, efficient sealing, negative pressure pretreatment and automatic recovery of excess material, and the corresponding vacuum melting furnace and adding method are matched to improve the stability, efficiency and product quality of the vacuum melting process, and meet the production requirements of high-quality metal materials.

[0008] To achieve the above-mentioned purpose, the application adopts the following technical solutions: The vacuum melting furnace auxiliary material adding device comprises a storage tank and an adding box, and further comprises a weighing box and a feed inlet arranged at the top of the adding box, wherein the weighing box is located in the adding box and below the feed inlet, a partition plate is fixedly connected in the adding box, a blanking pipe is communicated with the inner bottom of the weighing box, a valve is arranged on the blanking pipe, the blanking pipe penetrates through the partition plate, and a weighing assembly is arranged in the adding box to weigh the weight of the auxiliary material entering the weighing box. The sealing assembly is located above the adding box, and comprises two guide rails arranged above the adding box, a closing plate is slidably connected to the two guide rails, a hydraulic rod is installed on the right side of the adding box, the extension end of the hydraulic rod is connected to the right side of the closing plate through a connecting plate, the connecting plate is L-shaped, and the adding box is closed when the weight of the auxiliary material in the weighing box reaches a preset weight; and a negative pressure pump is communicated with the top space of the adding box through a connecting pipe to extract the gas in the adding box after the adding box is closed.

[0009] Preferably, the first spiral conveying assembly and the second spiral conveying assembly are further included, the first spiral conveying assembly comprises two fixed plates fixedly connected to the right side of the storage tank, adjacent sides of the two fixed plates are fixedly connected with a slope box, a first rotating rod is rotatably connected in the slope box, a first conveying spiral vane is fixedly connected to the outer wall of the first rotating rod, a second motor is installed on the left side of the slope box, the output shaft end of the second motor is fixedly connected to the first rotating rod, a feed hopper is communicated with the upper end of the slope box, and a discharge port is communicated with the lower end of the slope box, and the first spiral conveying assembly is used for conveying the auxiliary material conveyed by the second spiral conveying assembly into the weighing box.

[0010] Preferably, the second screw conveying assembly comprises a vertical box fixedly connected to the inner bottom of the storage tank, the vertical box is provided with a feeding port on the left and right sides, a second rotating rod is rotatably connected in the vertical box, a second screw conveying blade is fixedly connected to the outer wall of the second rotating rod, a discharging plate is fixedly connected to the right side of the vertical box, the discharging plate is arranged in an inclined downward manner, the right side of the discharging plate extends to the outside and is located above the feeding hopper, the second screw conveying assembly runs to convey the auxiliary materials to the upper side and then the auxiliary materials fall into the feeding hopper through the discharging plate, a first motor is installed at the lower end of the storage tank, the lower end of the second rotating rod extends to the outside, and a bevel gear is installed on the output shaft of the second rotating rod and the first motor and the bevel gears are meshed with each other.

[0011] Preferably, a material returning assembly is arranged above the adding box, the material returning assembly comprises two fixed blocks fixedly connected above the adding box, adjacent sides of the two fixed blocks are rotatably connected with a rotating shaft, two square blocks are fixedly connected to the rotating shaft, a switching plate is fixedly connected to the upper ends of the two square blocks, the switching plate is located below the discharging port, a rotating gear is installed on the rotating shaft, a rack is fixedly connected to the left side of the closing plate and is meshed with the rotating gear, an opening is arranged on the right side of the storage tank, a material returning plate is fixedly connected in the opening and cooperates with the switching plate, and the initial state is a right-tilting state, through the operation of the first screw conveying assembly and the second screw conveying assembly, the materials are conveyed into the weighing box, when the materials in the weighing box reach a preset value, the switching plate is switched to a left-tilting state, and the excess materials fall into the storage tank.

[0012] Preferably, a material returning assembly is arranged above the adding box, the material returning assembly comprises two fixed blocks fixedly connected above the adding box, adjacent sides of the two fixed blocks are rotatably connected with a rotating shaft, two square blocks are fixedly connected to the rotating shaft, a switching plate is fixedly connected to the upper ends of the two square blocks, the switching plate is located below the discharging port, a rotating gear is installed on the rotating shaft, a rack is fixedly connected to the left side of the closing plate and is meshed with the rotating gear, an opening is arranged on the right side of the storage tank, a material returning plate is fixedly connected in the opening and cooperates with the switching plate, and the initial state is a right-tilting state, through the operation of the first screw conveying assembly and the second screw conveying assembly, the materials are conveyed into the weighing box, when the materials in the weighing box reach a preset value, the switching plate is switched to a left-tilting state, and the excess materials fall into the storage tank.

[0013] Preferably, the weighing assembly comprises protrusions fixedly connected to four sides of the weighing box, the inner walls of four sides of the adding box are fixedly connected with weighing half-rings, the inner walls of each weighing half-ring are provided with a pressure sensor, and the four protrusions are located on the corresponding weighing half-rings.

[0014] The application also provides a vacuum melting furnace, which comprises a furnace body and an auxiliary material adding device, the auxiliary material adding device is a vacuum melting furnace auxiliary material adding device, and the lower end of the adding box is in space communication with the top of the furnace body.

[0015] The application also provides a method for adding auxiliary materials by using the vacuum melting furnace auxiliary material adding device, which comprises the following steps: S1: start the second screw conveying assembly to convey the auxiliary materials in the storage tank into the first screw conveying assembly; and simultaneously start the first screw conveying assembly to convey the auxiliary materials into the weighing box; S2: Real-time monitoring of the weight of the auxiliary material in the weighing box through the pressure sensor of the weighing assembly; S3: When the weight of the auxiliary material in the weighing box reaches the preset value, the sealing assembly closes the feeding port, and the switching plate switches to the left tilting state; at the same time, the electromagnet is energized to repel, so that the baffle moves down, and the excess auxiliary material slides into the storage box; S4: Start the negative pressure pump, and extract the gas in the adding box through the connecting pipe, open the valve on the dropping pipe after the adding box reaches the preset negative pressure value, and the auxiliary material falls into the vacuum smelting furnace body through the dropping pipe, and the auxiliary material adding is completed.

[0016] The present application has the following beneficial effects: 1. Compared with the prior art, the auxiliary material is accurately weighed and automatically controlled. Through the cooperation of the weighing half ring and the protrusion in the weighing assembly, the pressure sensor can monitor the weight of the auxiliary material in the weighing box in real time and accurately, avoiding the weight deviation caused by manual estimation or simple measurement; at the same time, when the weight reaches the preset value, the sealing assembly and the material returning assembly are linked to quickly switch the tilting direction of the switching plate and trigger the material blocking assembly, effectively preventing excess auxiliary material from entering the weighing box, further improving the adding accuracy, ensuring the stability of the smelting product composition, and especially suitable for precise smelting needs of high-purity alloys; 2. Compared with the prior art, the sealing assembly drives the sealing plate to slide along the guide rail through the hydraulic rod, which can quickly close the adding box after weighing is completed, avoiding continuous entry of external air; cooperating with the negative pressure pump to extract the residual gas in the adding box through the connecting pipe, the adding box can be pretreated to a preset negative pressure state before the auxiliary material enters the furnace body, completely eliminating the problem of air carried by the auxiliary material destroying the vacuum environment in the furnace, reducing the generation of impurities such as oxides and nitrides, and improving the purity and mechanical properties of the smelting product; 3. Compared with the prior art, the material returning assembly drives the rack and the rotating gear to mesh by moving the sealing plate, realizing automatic switching of the tilting direction of the switching plate, and the excess auxiliary material blocked by the material blocking assembly can slide along the switching plate to the material returning plate and finally flow back to the storage box, without the need for additional power drive, the structure is simple and efficient in recycling; 4. Compared with the prior art, the conveying assembly, the weighing assembly, the sealing assembly, the material returning assembly and the material blocking assembly form a close linkage mechanism: after the weighing assembly monitors that the weight meets the standard, the sealing assembly can be triggered to start the closing action, the material returning assembly can switch the tilting direction, and the material blocking assembly can perform the blocking operation simultaneously, without manual intervention, effectively shortening the response delay of each link, avoiding the error accumulation caused by the asynchronous action of the components in the intermediate stage between "weighing meets the standard" and "closure is completed"; the whole adding process is automatically operated, reducing the labor intensity, improving the overall adding efficiency, and adapting to the industrial continuous production demand.

[0017] In summary, the present application aims at the problems of low weighing precision, easy interference in vacuum environment, serious material waste and poor component synergy of the existing auxiliary material adding device of vacuum melting furnace, through integrated design, the functions of precise weighing, efficient sealing, negative pressure pretreatment, automatic material returning and real-time blocking are organically combined, not only the auxiliary material adding precision and the melting product quality are significantly improved, but also the material waste is reduced, the maintenance cost is reduced and the automation level is improved, reliable technical support is provided for efficient and stable operation of the vacuum melting process, and the present application has high practical value and popularization prospect. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The structure schematic view of the auxiliary material adding device of the vacuum melting furnace provided by the present application is shown in the figure. Figure 2 The structure schematic view of the auxiliary material adding device of the vacuum melting furnace provided by the present application is shown in the figure. Figure 1 The structure schematic view of the auxiliary material adding device of the vacuum melting furnace provided by the present application is shown in the figure. Figure 3 The structure schematic view of the auxiliary material adding device of the vacuum melting furnace provided by the present application is shown in the figure. Figure 1 The structure schematic view of the auxiliary material adding device of the vacuum melting furnace provided by the present application is shown in the figure. Figure 4 The structure schematic view of the auxiliary material adding device of the vacuum melting furnace provided by the present application is shown in the figure. Figure 1 The structure schematic view of the auxiliary material adding device of the vacuum melting furnace provided by the present application is shown in the figure. Figure 5 The structure schematic view of the auxiliary material adding device of the vacuum melting furnace provided by the present application is shown in the figure. Figure 3 The structure schematic view of the auxiliary material adding device of the vacuum melting furnace provided by the present application is shown in the figure. Figure 6 The structure schematic view of the auxiliary material adding device of the vacuum melting furnace provided by the present application is shown in the figure.

[0019] In the figure: 1 storage box, 2 adding box, 3 negative pressure pump, 4 connecting pipe, 5 hydraulic rod, 6 connecting plate, 7 inclined box, 8 fixed plate, 9 feeding hopper, 10 discharging plate, 11 material returning plate, 12 first motor, 13 guide rail, 14 closing plate, 15 rack, 16 rotating shaft, 17 fixed block, 18 rotating gear, 19 switching plate, 20 rectangular block, 21 electromagnet, 22 baffle, 23 spring, 24 discharge port, 25 bevel gear, 26 second rotating rod, 27 second motor, 28 blanking pipe, 29 weighing box, 30 rectangular port, 31 first conveying helical blade, 32 first rotating rod, 33 vertical box, 34 second helical conveying blade, 35 feeding port, 36 weighing half ring, 37 protruding block, 38 furnace body. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

[0021] Reference Figures 1-6Vacuum smelting furnace auxiliary material adding device, including a storage tank 1 for storing auxiliary materials to be added and an adding box 2 for temporarily storing the weighed auxiliary materials and realizing negative pressure pretreatment, also including: an auxiliary material weighing box 29 for receiving and temporarily storing the delivered auxiliary materials and a feeding port 35 provided at the top of the adding box 2 and communicating with the outside, the weighing box 29 is located in the adding box 2 and below the feeding port 35, ensuring that the auxiliary materials falling from the feeding port 35 can completely enter the weighing box 29, a partition plate is fixedly connected in the adding box 2, which separates the adding box 2 into two independent spaces above and below, the upper space is used for installing the weighing box 29 and cooperating with the sealing assembly to realize sealing, and the lower space is used for communicating with the vacuum smelting furnace, the inner bottom of the weighing box 29 is communicated with a blanking pipe 28, the blanking pipe 28 is provided with a valve (preferably an electromagnetic valve, which can be automatically controlled through a control module), the blanking pipe 28 penetrates through the partition plate, and the adding box 2 is provided with a weighing assembly for weighing the weight of the auxiliary materials entering the weighing box 29, the weighing assembly includes protrusions 37 fixedly connected to four sides of the weighing box 29, the inner walls of the four sides of the adding box 2 are all fixedly connected with weighing half-rings 36, the inner walls of each weighing half-ring 36 are all provided with a pressure sensor, the pressure sensor is electrically connected with an external control module, can convert the pressure signal into weight data in real time and transmit to the control module, and the four protrusions 37 are located on the corresponding weighing half-rings 36, and the weight of the weighing box 29 and the internal auxiliary materials is transmitted to the pressure sensor of the weighing half-ring 36 through the protrusions 37; The sealing assembly is located above the adding box 2 and covers the area where the feeding port 35 is located, is used for sealing the top opening of the adding box 2 after weighing is completed, avoids outside air from entering, and includes two guide rails 13 provided above the adding box 2, a sealing plate 14 which is slidably connected to the two guide rails 13, a hydraulic rod 5 installed at the right side of the adding box 2, the hydraulic rod 5 is electrically connected with the control module, can receive the control module signal to realize the telescopic action, the telescopic end of the hydraulic rod 5 is connected with the right side of the sealing plate 14 through a connecting plate 6, the connecting plate 6 is L-shaped, one end of the connecting plate 6 is welded and fixed with the telescopic end of the hydraulic rod 5, and the other end is bolted with the right side wall of the sealing plate 14, so that the subsequent maintenance and disassembly are facilitated, when the weight of the auxiliary materials in the weighing box 29 reaches the preset weight, the control module sends a signal to the hydraulic rod 5, the hydraulic rod 5 is retracted to drive the sealing plate 14 to move leftwards along the guide rail 13, and the top opening of the adding box 2 is completely sealed until the top opening of the adding box 2 is completely sealed; a negative pressure pump 3, the negative pressure pump 3 is communicated with the top space of the adding box 2 through a connecting pipe 4, is used for pumping out the air and residual gas in the adding box 2 after the adding box 2 is sealed, so that a preset negative pressure environment is formed in the adding box 2, and the subsequent auxiliary materials entering the furnace body 38 do not carry gas to destroy the vacuum smelting environment.

[0022] The first screw conveying assembly comprises two fixed plates 8 fixedly connected to the right side of the storage box 1, and the adjacent sides of the two fixed plates 8 are fixedly connected with a slanted box 7. The slanted box 7 is arranged in an inclined manner, with the right end being higher than the left end, so as to facilitate the upward movement of the auxiliary materials under the action of gravity and the thrust of the screw blades. The slanted box 7 is rotatably connected with a first rotating rod 32, and the outer wall of the first rotating rod 32 is fixedly connected with first conveying screw blades 31. The pitch of the first conveying screw blades 31 is set according to the size of the auxiliary material particles, so as to ensure the stable movement of the auxiliary materials and avoid the blockage of the auxiliary materials. A second motor 27 is installed on the left side of the slanted box 7. The second motor 27 is a servo motor and is electrically connected with the control module, so as to realize the speed adjustment and further control the conveying speed of the auxiliary materials. The output shaft of the second motor 27 is fixedly connected with the first rotating rod 32. The slanted box 7 is communicated with a feeding hopper 9 at the upper end. The feeding hopper 9 is in the shape of a funnel, and the lower end thereof is in sealed communication with the inside of the slanted box 7, and the upper end thereof has a large opening size, so as to facilitate the receiving of the auxiliary materials. The lower end of the slanted box 7 is communicated with a discharge port 24. The first screw conveying assembly is used for conveying the auxiliary materials conveyed by the second screw conveying assembly into the weighing box 29.

[0023] The second screw conveying assembly comprises a vertical box 33 fixedly connected to the inner bottom of the storage box 1. The left and right sides of the vertical box 33 are provided with feeding ports 35. The vertical box 33 is rotatably connected with a second rotating rod 26. The outer wall of the second rotating rod 26 is fixedly connected with second screw conveying blades 34. The right side of the vertical box 33 is fixedly connected with a discharge plate 10 arranged in an inclined manner downward. The right side of the discharge plate 10 extends to the outside and is located above the feeding hopper 9. When the second screw conveying assembly operates, the second screw conveying blades 34 rotate to convey the auxiliary materials upward to the top of the vertical box 33. After the auxiliary materials overflow from the top of the vertical box 33, the auxiliary materials fall on the discharge plate 10 and slide to the feeding hopper 9 through the discharge plate 10. The lower outer wall of the storage box 1 is installed with a first motor 12 (the first motor 12 is a servo motor and is electrically connected with the control module, so as to be synchronously started and stopped with the second motor 27 and ensure the conveying cooperation) for driving the second rotating rod 26 to rotate. The lower end of the second rotating rod 26 extends to the outside through the bottom of the storage box 1. The part of the second rotating rod 26 located outside and the output shaft of the first motor 12 are both installed with bevel gears 25 (the modulus and the number of teeth of the two bevel gears 25 are consistent, so as to ensure stable transmission and convert the horizontal rotation of the first motor 12 into the vertical rotation of the second rotating rod 26).

[0024] The upper part of the adding box 2 is provided with a material returning assembly, the material returning assembly comprises two fixed blocks 17 fixedly connected above the adding box 2, the adjacent sides of the two fixed blocks 17 are commonly rotationally connected with a rotating shaft 16, the rotating shaft 16 is fixedly connected with two square blocks, the upper ends of the two square blocks are commonly fixedly connected with a switching plate 19, the surface of the switching plate 19 is smooth, and the edge is provided with a leakage prevention plate to avoid side leakage of the auxiliary material, the switching plate 19 is located below a discharge port 24, the rotating shaft 16 is installed with a rotating gear 18, the left side of the closing plate 14 is fixedly connected with a rack 15 engaged with the rotating gear 18, the length direction of the rack 15 is consistent with the moving direction of the closing plate 14, and the pitch of the rack 15 is matched with the pitch of the rotating gear 18, so that the engagement transmission is stable, the right side of the storage box 1 is provided with an opening, the opening is fixedly connected with a material returning plate 11 matched with the switching plate 19, the material returning plate 11 is obliquely arranged, one end of the material returning plate 11 is welded and fixed with the opening of the storage box 1, and the other end extends to below the left side of the switching plate 19, so that the excess auxiliary material on the switching plate 19 can fall on the material returning plate 11, and the initial state of the switching plate 19 is a right oblique state (in the initial state, the right side of the switching plate 19 is lower than the left side, and the auxiliary material slides to the adding box 2 inlet 35 along the switching plate 19), through the operation of the first spiral conveying assembly and the second spiral conveying assembly, the material is conveyed to the switching plate 19, and then falls to the weighing box 29 through the switching plate 19, when the material in the weighing box 29 reaches the preset value, the closing plate 14 moves to the left to drive the rack 15 to engage the rotating gear 18, so that the rotating shaft 16 drives the switching plate 19 to rotate, and the switching plate 19 switches to a left oblique state (at this time, the left side of the switching plate 19 is lower than the right side), and the excess material slides to the material returning plate 11 along the switching plate 19, and then flows back to the storage box 1 through the material returning plate 11.

[0025] The switching plate 19 is provided with a material blocking assembly, the material blocking assembly comprises a rectangular block 20 fixedly connected on the switching plate 19, the right side of the rectangular block 20 is provided with a moving groove, the inner top of the moving groove is provided with an electromagnet 21, and the moving groove is slidably connected with a baffle 22, and the adjacent sides of the electromagnet 21 and the baffle 22 are elastically connected through a plurality of springs 23.

[0026] The vacuum melting furnace comprises a furnace body 38 and an auxiliary material adding device, the auxiliary material adding device is the auxiliary material adding device of the vacuum melting furnace in any one of the above, and the lower end of the adding box 2 is in space communication with the top of the furnace body 38.

[0027] A method for adding auxiliary material by using the auxiliary material adding device of the vacuum melting furnace in any one of the above, comprising the following steps: S1: starting the second spiral conveying assembly, conveying the auxiliary material in the storage box 1 to the first spiral conveying assembly; and simultaneously starting the first spiral conveying assembly to convey the auxiliary material to the weighing box 29; S2: monitoring the weight of the auxiliary material in the weighing box 29 in real time through the pressure sensor of the weighing assembly; S3: When the weight of the auxiliary material in the weighing box 29 reaches the preset value, the sealing assembly closes the feeding port 35, and the switching plate 19 is switched to the left tilting state; at the same time, the electromagnet 21 is energized to repel, so that the baffle 22 moves downward, and the excess auxiliary material falls into the storage box 1; S4: Start the negative pressure pump 3, and extract the gas in the adding box 2 through the connecting pipe 4, open the valve on the blanking pipe 28 after the adding box 2 reaches the preset negative pressure value, and the auxiliary material falls into the vacuum smelting furnace body 38 through the blanking pipe 28, and the auxiliary material adding is completed.

[0028] The function principle of the present application can be described as follows: first, the auxiliary material conveying stage is entered, and stable feeding is realized through layered linkage in this stage, the first motor 12 is started, the second rotating rod 26 and the second spiral conveying blade 34 are driven to rotate through the meshing transmission of the bevel gear 25, the auxiliary material in the storage box 1 enters the inside of the vertical box 33 through the feeding port 35 on both sides of the vertical box 33, and is conveyed upward under the spiral thrust of the second spiral conveying blade 34, and finally conveyed to the discharge plate 10 from the top of the vertical box 33; because the discharge plate 10 is arranged in a downward inclined manner, the auxiliary material naturally slides along the discharge plate 10 to the feeding hopper 9 of the first spiral conveying assembly, and at the same time, the second motor 27 is started to drive the first rotating rod 32 and the first conveying spiral blade 31 to rotate in the inclined box 7, the auxiliary material in the feeding hopper 9 is rolled into the inclined box 7, moves to the discharge port 24 at the lower end of the inclined box 7 along with the rotation of the first conveying spiral blade 31, and finally discharged from the discharge port 24, and falls on the switching plate 19 which is initially inclined to the right, and then slides along the switching plate 19 to the feeding port 35 at the top of the adding box 2, and enters the weighing box 29 below the feeding port 35, and the layered conveying of the auxiliary material is completed.

[0029] Then the weighing monitoring stage is entered, and accurate quantity control is realized through real-time feedback, the protrusions 37 on four sides of the weighing box 29 are respectively arranged on the corresponding weighing half rings 36 on the inner wall of the adding box 2, the pressure sensor on the inner wall of the weighing half ring 36 monitors the pressure signal transmitted by the protrusion 37 in real time, and converts the signal into the weight data of the auxiliary material in the weighing box 29; the staff can preset the auxiliary material adding weight threshold, the pressure sensor continuously compares the real-time weight data with the preset threshold, when the real-time weight does not reach the threshold, the conveying assembly keeps running and the material blocking assembly is in the initial state, so as to ensure that the auxiliary material stably enters the weighing box 29; when the real-time weight reaches the preset threshold, the pressure sensor sends a signal to the control module to trigger the subsequent linkage operation.

[0030] Subsequently, the excess material processing stage is entered, and efficient recovery is achieved through synchronous switching. After the control module receives the weighing standard signal, the sealing assembly and the material return assembly are synchronously started: on the one hand, the hydraulic rod 5 is retracted to drive the sealing plate 14 to move leftward along the guide rail 13, the rack 15 on the left side of the sealing plate 14 is engaged with the rotating gear 18 on the rotating shaft 16, the rotating shaft 16 and the switching plate 19 are driven to rotate, so that the switching plate 19 is switched from the rightward tilting state to the leftward tilting state; on the other hand, the electromagnet 21 is electrified to generate magnetism, and the repulsive force is generated on the baffle 22, so that the baffle 22 moves downward to block the right side of the switching plate 19, so that the excess auxiliary materials cannot fall down, and the weight of the materials in the weighing box is ensured to be the preset value. At this time, the first screw conveying assembly is still conveying the excess auxiliary materials, which fall from the discharge port 24 onto the switching plate 19 that tilts leftward, slide along the switching plate 19 to the material return plate 11 on the right side opening of the storage tank 1, and then flow back to the storage tank 1 through the material return plate 11, so as to avoid the excess auxiliary materials from entering the weighing box 29 or being wasted due to falling, and realize the recycling of the materials.

[0031] Finally, the negative pressure sealing and adding stage is entered, which guarantees the vacuum environment to realize precise feeding. The sealing plate 14 continuously moves leftward under the drive of the hydraulic rod 5 until it completely covers the top of the adding box 2, so as to isolate the inside of the adding box 2 from the outside. Then, the negative pressure pump 3 is started, and the negative pressure pump 3 extracts the gas in the adding box 2 through the connecting pipe 4, so that a preset negative pressure state is formed in the adding box 2, and the residual air in the box is completely discharged to avoid that the air carried by the subsequent auxiliary materials destroys the vacuum smelting environment when the auxiliary materials enter the furnace body 38. After the negative pressure value in the adding box 2 reaches the preset standard, the control module controls the valve on the feeding pipe 28 to open, and the auxiliary materials that have been accurately measured in the weighing box 29 fall downward through the feeding pipe 28 under the action of gravity, and finally enter the furnace body 38 of the vacuum smelting furnace, so as to complete the entire auxiliary material adding process. Through the above operation mode, the components form a complete functional chain of "conveying-weighing-recycling-sealing-adding", and the precise addition of auxiliary materials, the guarantee of the vacuum environment and the efficient utilization of materials are coordinated and unified, which fully reflects the technical advantages of the present application.

[0032] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacement or change within the technical range disclosed by the present application according to the technical solution and the inventive concept of the present application, which should be covered within the protection scope of the present application.

Claims

1. A vacuum melting furnace auxiliary material adding device, comprising a storage tank (1) and an adding box (2), characterized in that, Also includes: Weighing box (29) and feed inlet (35) set at the top of the addition box (2). The weighing box (29) is located inside the addition box (2) and below the feed inlet (35). A partition is fixedly connected inside the addition box (2). A discharge pipe (28) is connected to the bottom of the weighing box (29). A valve is provided on the discharge pipe (28). The discharge pipe (28) passes through the partition. A weighing component is provided inside the addition box (2) for weighing the weight of the auxiliary materials entering the weighing box (29). A sealing assembly is located above the addition box (2). The sealing assembly includes two guide rails (13) set above the addition box (2). A sealing plate (14) is slidably connected on the two guide rails (13). A hydraulic rod (5) is installed on the right side of the addition box (2). The telescopic end of the hydraulic rod (5) is connected to the right side of the sealing plate (14) through a connecting plate (6). The connecting plate (6) is L-shaped and is used to seal the addition box (2) when the weight of the auxiliary material in the weighing box (29) reaches the preset weight. The negative pressure pump (3) is connected to the top space of the addition box (2) through the connecting pipe (4) and is used to extract the gas in the addition box (2) after the addition box (2) is closed.

2. The auxiliary material adding device for a vacuum melting furnace according to claim 1, characterized in that: It also includes a first spiral conveying assembly and a second spiral conveying assembly. The first spiral conveying assembly includes two fixed plates (8) fixedly connected to the right side of the storage box (1). The adjacent sides of the two fixed plates (8) are fixedly connected to an inclined box (7). A first rotating rod (32) is rotatably connected inside the inclined box (7). A first conveying spiral blade (31) is fixedly connected to the outer wall of the first rotating rod (32). A second motor (27) is installed on the left side of the inclined box (7). The output shaft end of the second motor (27) is fixedly connected to the first rotating rod (32). The upper end of the inclined box (7) is connected to a feed hopper (9). The lower end of the inclined box (7) is connected to a discharge port (24). The first spiral conveying assembly is used to convey the auxiliary materials conveyed by the second spiral conveying assembly to the weighing box (29).

3. The auxiliary material adding device for a vacuum melting furnace according to claim 2, characterized in that: The second spiral conveying assembly includes a vertical box (33) fixedly connected to the bottom of the storage box (1). The vertical box (33) has inlets (35) on both the left and right sides. A second rotating rod (26) is rotatably connected inside the vertical box (33). A second spiral conveying blade (34) is fixedly connected to the outer wall of the second rotating rod (26). A discharge plate (10) is fixedly connected to the right side of the vertical box (33). The discharge plate (10) is inclined downward. The right side of the discharge plate (10) extends to the outside and is located above the feed hopper (9). The second spiral conveying assembly transports the auxiliary material to the top and then slides down into the feed hopper (9) through the discharge plate (10). A first motor (12) is installed at the lower end of the storage box (1). The lower end of the second rotating rod (26) extends to the outside. Meshing bevel gears (25) are installed on the output shafts of the second rotating rod (26) and the first motor (12).

4. The auxiliary material adding device for a vacuum melting furnace according to claim 2, characterized in that: A return assembly is provided above the adding box (2). The return assembly includes two fixed blocks (17) fixedly connected above the adding box (2). The adjacent sides of the two fixed blocks (17) are rotatably connected to a rotating shaft (16). Two square blocks are fixedly connected to the rotating shaft (16). The upper ends of the two square blocks are fixedly connected to a switching plate (19). The switching plate (19) is located below the discharge port (24). A rotating gear (18) is installed on the rotating shaft (16). The closing plate (14) The left side of the storage box (1) is fixedly connected to a rack (15) that meshes with the rotating gear (18). The right side of the storage box (1) has an opening, and a return plate (11) that cooperates with the switching plate (19) is fixedly connected inside the opening. The initial state is tilted to the right. Through the operation of the first spiral conveying assembly and the second spiral conveying assembly, the material is conveyed to the weighing box (29). When the material in the weighing box (29) reaches the preset value, the switching plate (19) switches to the state of tilting to the left, and the excess material slides into the storage box (1).

5. The auxiliary material adding device for a vacuum melting furnace according to claim 4, characterized in that: The switching plate (19) is provided with a baffle assembly, which includes a rectangular block (20) fixedly connected to the switching plate (19). The right side of the rectangular block (20) is provided with a moving groove, and an electromagnet (21) is provided at the top of the moving groove. A baffle (22) is slidably connected in the moving groove. The adjacent sides of the electromagnet (21) and the baffle (22) are elastically connected by multiple springs (23).

6. The auxiliary material adding device for a vacuum melting furnace according to claim 1, characterized in that: The weighing assembly includes protrusions (37) fixedly connected to the four sides of the weighing box (29). Weighing half-rings (36) are fixedly connected to the inner walls of the four sides of the adding box (2). Each weighing half-ring (36) is provided with a pressure sensor on its inner wall. The four protrusions (37) are located on the corresponding weighing half-rings (36).

7. A vacuum melting furnace, comprising a furnace body (38) and an auxiliary material adding device, characterized in that: The auxiliary material adding device is the vacuum melting furnace auxiliary material adding device according to any one of claims 1-6, and the lower end of the adding box (2) is connected to the top space of the furnace body (38).

8. A method for adding auxiliary materials using the auxiliary material adding device for a vacuum melting furnace according to any one of claims 2-6, characterized in that, Includes the following steps: S1: Start the second spiral conveyor assembly to convey the auxiliary material in the storage box (1) to the first spiral conveyor assembly; at the same time, start the first spiral conveyor assembly to convey the auxiliary material to the weighing box (29); S2: The weight of the auxiliary materials in the weighing box (29) is monitored in real time by the weighing component; S3: When the weight of the auxiliary material in the weighing box (29) reaches the preset value, the sealing component will close the feed port (35) and the switching plate (19) will switch to the left tilting state; S4: Start the negative pressure pump (3) and extract the gas in the addition box (2) through the connecting pipe (4). After the addition box (2) reaches the preset negative pressure value, open the valve on the discharge pipe (28) and the auxiliary material falls into the vacuum melting furnace through the discharge pipe (28) to complete the addition of auxiliary material.

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