310 results about "Briquette" patented technology

The invention provides a preparation method for improving the performance and carbon sequestration rate of a steel slag carbonized product, and the preparation method specifically comprises the following steps: (1) weighing the following raw materials in percentage by mass: 50-100 parts of steel slag powder, 13-17 parts of deionized water and 1 part of alcohol amine; (2) mixing the weighed deionized water with alcohol amine to obtain an alcohol amine solution, stirring the alcohol amine solution in a magnetic stirrer, continuously introducing CO2 gas with the concentration of 99.9% to carbonate the alcohol amine solution, and controlling the gas introduction time to be 2 hours; (3) doping an alkylol amine solution subjected to carbonation treatment into the weighed steel slag powder, and uniformly stirring by using a neat paste stirrer; (4) pressing the steel slag mixture into steel slag product briquettes in a compression molding manner; and (5) putting the briquette into a carbonization kettle, and introducing CO2 gas with the purity of 99.9% to prepare a steel slag carbonized product. The problem that the interior of the steel slag carbonized product cannot be fully carbonated and maintained is solved, so that the comprehensive performance and the carbon sequestration rate of the steel slag carbonized product are remarkably improved.

The invention discloses an inorganic normal-temperature rapid-hardening coal-rock mass reinforcing and filling material, and relates to the technical field of mine reinforcement. The material comprises a liquid A and a liquid B, the liquid A is prepared from cement, fly ash, magnetic nano silicon dioxide, citric acid and a layered bimetal oxide-sodium hexametaphosphate compound; and the liquid B comprises water glass, superfine limestone and water. During use, the liquid A and the liquid B are mixed according to the volume ratio of 1: 1 and injected into a target area, and a 1.5 Tesla magnetic field is applied at the initial stage of grouting until the grout is initially set. Through the synergistic effect of the compound protection dispersing agent, the magnetic particles and an external magnetic field, the technical problems that an existing material is unstable in performance due to temperature change, nanoparticles are prone to agglomeration, and magnetic response is attenuated in an alkaline environment are effectively solved; the technical effects of rapid solidification, high strength and excellent durability in high-temperature, low-temperature and complex mine environments are achieved.

The invention relates to the technical field of steel smelting scrap steel briquette treatment, and particularly provides a neutron generator-based scrap steel briquette component online detection device and method. Neutrons generated through nuclear reaction of a neutron generator are absorbed and activated with elements such as Fe in the scrap steel, gamma rays with characteristic energy are emitted, then the energy intensity of the gamma rays is observed, contrasted and calibrated from the response of a detector, and therefore the content composition and the content proportion of all the elements, mainly the Fe element, in the scrap steel briquette are calculated, analyzed and determined. The device effectively avoids the low-quality employment risk in the detection of the scrap steel briquettes, solves the problems that the detection of the internal quality of the scrap steel briquettes is difficult, time-consuming and labor-consuming, remarkably improves the working efficiency and effect, and has remarkable economic benefits and popularization prospects.

This invention discloses a method for preparing high-reactivity blast furnace charge from magnetite concentrate with low carbon content, and the blast furnace charge itself, belonging to the field of iron and steel metallurgical technology. The method involves sequentially mixing iron-containing raw materials with an organic-inorganic composite binder, multifunctional additives, and water, followed by high-pressure roller molding and solidification to obtain the finished cold-pressed briquettes. By optimizing the particle size distribution of the raw materials and adding multifunctional additives, this method can significantly improve the strength and reducibility of the cold-pressed briquettes. The process is simple, requires no high-temperature treatment, and has low carbon emissions.

The invention discloses a method for preparing high-purity chromium metal through carbon reduction, which comprises the following steps: proportioning chromic oxide, carbon powder, starch and water according to a certain proportion, and carrying out primary compaction to obtain a wet blank; adding the wet blank into an electric arc furnace, and smelting and melting to obtain bulk carbon chromium; after being manually and coarsely crushed, the molten and cooled large carbon chromium blocks are sequentially fed into a jaw crusher and a column mill to be crushed; adding chromic oxide, starch and water into the crushed carbon chromium, mixing, and carrying out secondary compaction to obtain a briquette-like material; feeding the coal-like spherical material into a drying box, gradually heating, fully drying a green body, and then cooling; and after drying, loading the blank into a vacuum reduction furnace layer by layer, and carrying out vacuum reduction on chromium sesquioxide and carbon chromium in a four-side heating manner to obtain the high-purity metal chromium. According to the method, preparation of high-purity metal chromium is achieved, and the conversion rate of preparing metal lattice powder from chromium oxide can be greatly increased; and the content of impurities in the metal chromium is reduced.

The invention provides a coke nut distribution method and system for blast furnace top distribution, and relates to the field of blast furnace ironmaking. The method comprises the steps that three-dimensional modeling software is adopted, a three-dimensional geometric model is built for blast furnace top material distribution equipment, a material model is built for materials, physical attribute parameters between the materials are set, and an initial model is obtained; optimizing the physical attribute parameters among the materials to obtain an optimized material distribution model; a plurality of working conditions are preset according to the feeding states of the ores and the coke nuts, and the optimized material distribution model is adopted for simulation; and analyzing the simulation result of each working condition, and determining the optimal working condition of the coke nut distribution effect. According to the method, a three-dimensional simulation model established according to actual blast furnace top material distribution equipment is utilized, simulation is performed under different preset working conditions, the distribution behavior and rule of the coke nuts in the whole transfer process of entering the blast furnace throat from the under-tank system are analyzed, and finally the working condition of the optimal coke nut material distribution effect is determined; and interference and inhibition of nut coke on central airflow during blast furnace combustion are reduced.

The invention relates to the technical field of straw briquettes, and discloses straw briquette production equipment which comprises a first supporting bottom plate, a mounting block is fixedly connected to one side of the top of the first supporting bottom plate, and a transmission assembly is arranged in the mounting block. According to the device, an air cylinder serves as a power source, a connecting column is precisely driven to cooperatively drive a connecting frame and a limiting plate to execute reciprocating motion, mechanical quantitative stirring discharging operation is achieved, in the discharging process, the limiting plate moving in a reciprocating mode can push straw clamped at a feeding port, and feeding can be completed without manual stirring; in the discharging process, the continuity of the discharging process is guaranteed, the potential safety hazard that operators make contact with high-speed rotating parts is eliminated, the production safety and reliability are remarkably improved, automation, quantification and safety of material treatment are achieved through precise matching of mechanical structures, and the production efficiency is improved. And the technical advantages of a mechanical linkage system are fully shown.

The invention discloses high-strength sludge type carbon and a preparation method thereof, and belongs to the technical field of clean type carbon preparation. Municipal sludge and low-rank coal are used as main raw materials, different types of binders with different mass proportions are added, a full-automatic tablet press is used for pressing the mixed material into sludge briquette coal under a certain forming load, and low-temperature pyrolysis is performed in a fixed bed reactor at a certain heating rate and a certain pyrolysis temperature to prepare the high-strength sludge briquette coal. According to the invention, the cold pressing strength of the sludge type carbon is improved, so that the sludge type carbon meets the strength requirements of related technologies. The invention provides a clean and efficient method for resource utilization of municipal sludge.

The invention belongs to the technical field of collaborative and comprehensive utilization of metallurgical solid waste resources, and particularly relates to a method for preparing a high-nickel ferrochrome alloy from electric furnace refining dust and blast furnace dedusting ash. The method comprises the following steps: uniformly mixing electric furnace refining dust, blast furnace dedusting ash and coking coal, and carrying out hot press molding to obtain a mixed briquette; carrying out high-temperature carbon thermal reduction on the mixed briquette; cooling the high-temperature carbon thermal reduction product under the protection of inert gas to obtain a high-nickel ferrochrome alloy and self-pulverization slag; according to the method for preparing the high-nickel ferrochrome alloy, a flux and a binder are not used. According to the method, the electric furnace refining dust and the blast furnace dedusting ash are combined, and a large amount of C contained in the blast furnace dedusting ash is used for efficiently reducing metal elements such as Fe, Cr and Ni in the electric furnace refining dust, so that the effect of turning waste into wealth is achieved, flux, binder and the like do not need to be added in the process, and the cost is low. And the energy consumption can be reduced while the collaborative utilization of solid waste resources is realized.

The application provides a waste material block packaging device, and relates to the technical field of block wire penetrating, which comprises a feeding frame and a pressing bin connected with the feeding frame. A pressing assembly for extruding waste material is arranged in the feeding frame. A wire penetrating assembly for penetrating iron wire through the block is arranged on one side of the pressing bin. A shearing assembly for shearing the iron wire and a wire winding assembly symmetrically arranged on both sides of the shearing assembly are arranged on the other side of the pressing bin. A positioning assembly for driving the wire penetrating assembly, the shearing assembly and the wire winding assembly to automatically position corresponding positions of the pressing assembly to realize the bundling of blocks of different sizes is further arranged on the pressing bin. The application can penetrate and bundle the blocks of different sizes extruded, thereby improving the efficiency of extruding and packaging the waste material.

The invention provides a scrap steel quality inspection APP pressing block two-end dismounting prompting method, and relates to the technical field of scrap steel quality inspection in the iron and steel industry, and the method comprises the following steps: S1, material type selection: an acceptor selects a to-be-inspected scrap steel pressing block type in a scrap steel quality inspection APP system according to an actual condition; s2, inputting to-be-detected information: inputting specific information of a to-be-detected briquetting vehicle; and S3, two-end unpacking prompting: according to the input layer number, row number and column number of the to-be-detected briquette vehicle, dynamically generating an unpacking instruction by the APP, and prompting an acceptor to carry out unpacking detection. According to the scrap steel quality inspection APP pressing block two-end-disassembly prompting method, an unpredictable and tamper-resistant random unpacking mark generation system is constructed, dynamic generation of an unpacking instruction is achieved, the sampling rule is transparent, man-made interference is resisted, and the unpacking efficiency is improved. Therefore, the problems that the inspection efficiency is reduced due to full-amount disassembly of the two ends and the internal quality of the pressing block is possibly covered due to lack of randomness are solved, and the accuracy and the high efficiency of scrap steel inspection are effectively improved.

This utility model relates to the field of honeycomb briquette stove technology, and in particular discloses a honeycomb briquette stove with convenient slag removal, including a furnace frame and a furnace core mounted on the furnace frame for holding coal; it also includes a slag removal mechanism mounted on the furnace frame and used in conjunction with the furnace core. The slag removal mechanism includes a loading component, a slag pushing component movably mounted relative to the loading component, and a transmission mechanism that works in conjunction with the slag pushing component. The loading component is used to carry the coal located at the bottom of the furnace core. A first clearance space is provided between the loading component and the furnace core for the movement of the slag pushing component and the coal at the bottom of the furnace core. The user drives the slag pushing component to move back and forth through the transmission mechanism, so that the slag produced by the combustion of the coal at the bottom of the furnace core is pushed out. This utility model achieves rapid slag removal by setting a foot-operated transmission mechanism and using a mechanical slag pushing mechanism, avoiding the risks of manual operation and improving combustion efficiency; the setting of the limiting and dividing component further divides the slag during the removal process, preventing blockage and accumulation.

The present application provides a briquette pre-dust removal system and a briquette pre-dust removal method, which are used for modifying the briquette before the oxidation and carbonization processes, removing the coal dust on the surface of the briquette, and recycling the coal dust. The briquette pre-dust removal system comprises a gravity-free stirring device, a first separator and a second separator. The first separator has a first separation cavity, a first separation inlet, a first separation outlet and a first coal dust outlet, which are in communication with the first separation cavity. The second separator has a second separation cavity, a second separation inlet and a second separation outlet, which are in communication with the second separation cavity. The present application solves the problem that the existing briquette crushing material has a high dust removal rate during the carbonization process, and the fallen coal dust cannot be recycled.

The utility model discloses a kind of briquettes suitable for anti-accumulation of dust assembly, including briquette body, laminated part and frame, the briquette body includes two kinds of middle pressure and side pressure, the middle part of briquette body is equipped with mounting groove, the side of briquette body integrally formed with briquette assembly, the bottom of briquette assembly is hingedly arranged with pressing plate, pressing plate upper end integrally formed with carding member profile, the position of briquette assembly bottom carding member profile is equipped with clamping groove, the bottom of pressing plate integrally formed with three element ethylene propylene rubber.The utility model relates to a kind of briquettes suitable for anti-accumulation of dust assembly, solves the problem of hot anti-accumulation of dust assembly installation on market, and the installation step of conventional assembly is identical, need not add installation step, applicable to single glass or double glass assembly, non anti-accumulation of dust assembly can also be universal, power station end is free from switching, alleviate inventory pressure, EPDM exceeds briquette effectively avoid cutting surface when assembly is stressed to glass, more safe.

This invention relates to the field of solid waste utilization in stainless steel smelting, and a method for the efficient utilization of 0-3mm stainless steel slag, comprising the following steps: Step 1: Briquetting small-particle stainless steel slag; Step 2: Baking the slag steel briquettes; Step 3: Using the slag steel briquettes; Step 4: molten steel from AOD smelting undergoes LF refining before being continuously cast in the continuous casting process. The beneficial effects of this invention are: 1. By baking the small-particle slag steel briquettes and using them in the AOD furnace, the loss of chromium and nickel elements caused by high-temperature burning and oxidation in the electric furnace is reduced. 2. Baking after briquetting using high-temperature steam inside the factory improves baking efficiency and reduces baking costs. 3. Adding small-particle slag steel briquettes to the AOD furnace can replace expensive nickel-iron alloys for fine-tuning the composition, reducing smelting costs, realizing the recycling of waste resources, and reducing environmental pollution.

The utility model provides a crushing device for coal processing, which relates to the technical field of coal processing and comprises a crushing device feed hopper and a crushing cabin assembly, a feed hopper distributing inclined plate is fixedly mounted in the crushing device feed hopper, and the crushing cabin assembly is fixedly mounted below the crushing device feed hopper. A driving motor is fixedly installed on the surface of the rear side of the crushing cabin assembly, a discharging hopper is integrally arranged on the side face of the crushing cabin assembly, and a discharging conveying hose is fixedly connected to the outer end of the discharging hopper. According to the scheme, sampled briquettes are fed into the feeding hopper of the crushing device in a manner of feeding through the conveying belt, and are separated through the feeding hopper separation inclined plate in the feeding hopper of the crushing device, so that the fed briquettes enter separately, and the briquettes cannot be stuck at a feeding opening and are crushed through the crushing cabin assembly firstly; and then the briquette coal is ground into fine powder, so that the internal texture of the briquette coal can be conveniently inspected.

The invention relates to a method for producing briquettes (1), a briquette (1) from a waste material (2), and the use of a briquette (1) in the method according to the invention. The method involves providing a waste material (2) comprising at least one metal (3) and at least one organic material (4). The waste material (2) undergoes one- or multi-stage mechanical processing, and at least one first fraction (5) is separated from the waste material (2). A briquette mixture (6) containing the at least one first fraction (5) is produced, wherein the at least one first fraction (5) has a calorific value of 0 MJ / kg to 30 MJ / kg. The calorific value of the briquette mixture (6) is adjusted by varying at least the first fraction (5). The briquette mixture (6) is placed in a briquetting device (7) and compressed there into briquettes (1).Briquettes (1) with a calorific value of 5 MJ / kg to 30 MJ / kg and with a maximum copper content of 0.1 wt.% to 20 wt.% are produced.

1. Name of the designed product: barbecue charcoal block. 2. Use of the designed product: for burning. 3. Design points of the designed product: in shape. 4. Picture or photo best indicating the design points: perspective view.

The invention relates to the technical field of blast furnace ironmaking, and particularly discloses a method for cleaning a dead coke pile in a large blast furnace, a cleaning agent is added into the blast furnace, the cleaning agent adopts hot-melt briquettes or crushed iron particles, and the adding batch weight of the cleaning agent is controlled; controlling the material distribution angle and the material distribution turn number of the cleaning agent; an independent cleaning agent material is added after five batches of normal material distribution, and circulation is carried out; controlling the temperature of the molten iron and the mass percentage of Si element in the molten iron during cleaning of the dead coke pile; the dead coke stockpile cleaning is continuously carried out; according to the method, high-grade hot-melt briquettes or small-particle-size crushed iron particles are adopted as a cleaning agent to clean coke powder shells on the outer layer of the dead coke pile, so that the air permeability and liquid permeability of the dead coke pile are improved; on the basis that an existing material distribution mode is not changed, a group of special cleaning agents entering the blast furnace from special positions are periodically added and used for cleaning coke powder on the outer edge of a central dead coke pile; the furnace charge structure during normal production is not changed, and the furnace condition fluctuation of the blast furnace is avoided to the greatest extent.

The application discloses a large-koji briquetting device and belongs to the technical field of fermentation and brewing equipment. The device comprises a large-koji briquetting model for loading koji material of large koji, a model positioning table for positioning the large-koji briquetting model, a longitudinal assembly plate vertically arranged on the model positioning table, a vertical material bucket arranged above the large-koji briquetting model, a discharge port at the lower end of the vertical material bucket, a fine port at the upper end of the vertical material bucket, a sliding push rod arranged in the fine port, the sliding push rod sliding in the fine port, a briquetting push plate connected to the lower end of the sliding push rod and sliding in the vertical material bucket, a feeding channel arranged on one side of the upper end of the vertical material bucket for feeding the koji material of large koji into the vertical material bucket, an extrusion driving mechanism arranged at the upper end of the longitudinal assembly plate for driving the sliding push rod to move downward, the briquetting push plate extending into the large-koji briquetting model to extrude the koji material of large koji and form a large-koji briquette, and a lifting guide mechanism arranged on the longitudinal assembly plate for guiding the longitudinal moving direction of the vertical material bucket.

The invention relates to the technical field of compression forming processing, in particular to a diesel oil anti-wear agent waste raw material recycling and forming device which comprises a storage hopper and further comprises a compression mechanism arranged at the bottom of the storage hopper and used for receiving and continuously compressing waste falling from the storage hopper. The compression mechanism comprises a pressing die assembly and a segmented compression assembly, the segmented compression assembly is arranged in the pressing die assembly, and the segmented compression assembly and the pressing die assembly alternately act to achieve continuous compression forming of waste. The waste collecting device has the beneficial effects that waste is received and conveyed through intermittent rotation of the compression disc, meanwhile, the driving assembly and the compression disc alternately act, after the compression disc intermittently rotates, the driving assembly is driven to drive the compression plate to move, and due to the fact that the sizes of the multiple transmission arms and the shaft arms are gradually increased in the rotation direction of the compression disc, the waste is collected and conveyed. Waste materials can be compressed and formed in a segmented mode in the segmented compression bin, so that waste material fibers are arranged more evenly, and the compaction degree of waste material briquettes is improved.

The utility model discloses a pneumatic clamping device for carbon block sampling, which comprises a movable frame with an opening on one side, universal wheels which are uniformly distributed are arranged at the bottom of the movable frame, a horizontal cylinder is arranged on one side of the movable frame adjacent to the opening side of the movable frame, a push plate positioned in the movable frame is arranged at the telescopic end of the horizontal cylinder, and the push plate is connected with the movable frame. A rail assembly is arranged at the top of the movable frame, a sliding block is movably mounted on the rail assembly, a vertical air cylinder is arranged on the sliding block, and a mounting plate used for mounting a sampler is arranged at the telescopic end of the vertical air cylinder. According to the pneumatic clamping device for carbon block sampling, a carbon block can be clamped and fixed, a sampler can be installed and fixed, sampling operation can be carried out without transferring the carbon block, relative displacement or deflection between the carbon block and the sampler in the sampling process can be avoided, the influence on a sampling carbon rod can be reduced, and the sampling efficiency is improved. The device is beneficial to improving the accuracy of subsequent quality detection, and is simple in structure and convenient to operate.

The utility model provides a briquette coal blanking device and a blanking system, and relates to the field of briquette coal production. The briquette coal discharging device comprises a mounting frame, a conveying belt and a conveying belt, the air cylinder is arranged on the mounting frame; the material blocking assembly is at least provided with a material blocking head; the side, away from the material blocking head, of the material blocking assembly is rotationally arranged on the mounting frame. The material blocking assembly is provided with a first connecting piece, and the first connecting piece is rotationally connected with a telescopic rod of the air cylinder. The fixed end of the air cylinder is rotationally connected with the mounting frame, so that the telescopic rod can drive the material blocking head to be close to or away from the belt surface of the belt conveying rail when stretching out and drawing back; according to the utility model, briquette coal gangue on one conveying belt is automatically and quickly discharged into a plurality of different finished product bins respectively, the occupied space is small, and the working efficiency and the finished product rate can be improved.

Described are enhanced charcoal briquettes. Charcoal briquettes are formed from coal dust, a biomass material, sawdust, and / or the like. A combustible coating is disposed about at least part of the charcoal briquette. The combustible coating acts as an initial ignition material during initial lighting of a pile of enhanced charcoal briquettes. The charcoal briquette within the combustible coating acts as a main / primary ignition material. Effective and sustained ignition of the charcoal briquette is aided by the combustion of the initial ignition material at least partially coating / disposed about the charcoal briquette. When enhanced charcoal briquettes are piled together, the combustible coating disposed on and / or about at least part of each charcoal briquette functions as a spacer between adjacent briquettes to increase airflow through the pile of briquettes, leading to more effective secondary ignition of the charcoal briquettes following ignition / combustion of the combustible coating.

The invention relates to a process for producing briquettes (1), a briquette (1) from a waste material (2), and the use of a briquette (1) in the process according to the invention. The process involves providing a waste material (2) comprising at least one metal (3) and at least one organic material (4). The waste material (2) is mechanically treated in one or more stages, and at least a first fraction (5) is separated from the waste material (2). A briquette mixture (6) containing the at least a first fraction (5) is prepared, wherein the at least a first fraction (5) has a calorific value of 0 MJ / kg to 30 MJ / kg. The calorific value of the briquette mixture (6) is adjusted by varying the at least the first fraction (5). The briquette mixture (6) is fed into a briquetting machine (7) and compressed there to form briquettes (1).This produces briquettes (1) with a calorific value of 5 MJ / kg to 30 MJ / kg and with a maximum copper percentage of 0.1% by weight to 20% by weight.

The invention relates to the field of heavy metal sludge treatment devices, and discloses a heavy metal treatment device and method for reservoir sediment, the heavy metal treatment device comprises a mounting rack, the inner wall of the mounting rack is fixedly connected with a storage barrel, one end of the storage barrel is fixedly provided with a heat dissipation box, and the inner wall of the heat dissipation box is provided with a feeding assembly; the feeding assembly comprises a motor, one end of the motor is fixedly installed on the inner wall of the heat dissipation box, the output end of the motor is fixedly connected with a rotating shaft, one end of the rotating shaft is fixedly connected with an auger roller, the outer wall of the rotating shaft is fixedly connected with a synchronous wheel, and the outer wall of the synchronous wheel is provided with a synchronous belt. And a connecting shaft is fixedly connected to the interior of one synchronous wheel. The rotating shaft is driven by the motor to rotate, synchronous linkage of auger conveying and stirring operation is achieved, sludge is fully pre-stirred before entering the storage barrel, hardened bottom mud blocks are effectively scattered, and the reaction efficiency of subsequent chemical treatment is improved.

The invention relates to a carbonized solid mass for a blast furnace, comprising in the composition: at least one carbon source (10); at least one calcium source (11); and at least one binder (12); wherein, after the mechanical shaping (200) of the solid mass, the mass is subjected to a pyrolysis step (400) at a temperature greater than or equal to 600 DEG C and less than 800 DEG C; wherein the solid mass comprises 25 to 35 mass% of at least one calcium source (11). The invention also relates to a method for producing the proposed solid mass.

The invention discloses a production method of an iron ore block mass for a direct reduction reaction furnace. The production method comprises the following steps: dispersing a nano material in a binder; mixing with iron ore powder and / or steelmaking byproducts and additives; adjusting moisture; carrying out agglomeration; solidifying the block mass; the surface of the briquette is coated with a coating to reduce blocking effects in a direct reduction reaction furnace.

The present invention relates to a plant growing medium comprising a. shredded and dried green waste, b. shredded and dried animal manure, and c. cellulose. The invention further relates to a method for producing this plant growing medium. Finally, the invention also relates to the use of this plant growing medium, among other things, as a water-retaining and fertilizing peat substitute in agriculture, horticulture, or forestry, its use as a loose building material for insulation construction, and its use as insulation material. The invention further relates to a plant growing medium pressed into briquettes or pellets and the use of these briquettes or pellets as fuel.

The invention provides a circular mold forming machine for biomass compact briquette fuel processing, and relates to the field of biomass fuel processing, the circular mold forming machine comprises a forming machine main body, and a protective cover is hinged to the outer side of the top end face of the forming machine main body; the connecting shaft is hinged to the outer side of the upper end of the forming machine main body; the rotary positioning frame is rotationally arranged on the outer side below the ring mold in the forming machine main body; the transmission supporting disc is rotationally connected to the inner end of the rotary positioning frame; the two rotating fulcrum shafts are vertically and rotatably arranged below the connecting shaft in a bilateral symmetry manner; the locking auxiliary mechanism is arranged among the rotating fulcrum shaft, the driving auxiliary shaft and the connecting shaft; the protective cover can be prevented from being opened during equipment operation, so that the use safety of the circular mold forming machine in the actual application process is improved, and the normal operation and granulation quality of the circular mold forming machine are improved; the problem that normal operation and granulation quality of equipment are affected due to the fact that an operator directly opens a protective cover when the equipment is abnormal or in an emergency is solved.