Inoculant, preparation method and preparation device

Abstract

The present invention discloses an inoculant, a preparation method and a preparation device, relating to the field of inoculant production, including 70%-75% silicon, 1%-4% niobium, 1.5%-2% calcium, 0.8%-1.5% aluminum, 2%-4% barium and 14%-23% iron. For the inoculant provided by the present invention, 1%-4% niobium element is added to the components of the inoculant. The niobium element can not only increase the tensile strength, bending strength and impact toughness of cast iron, but also reduce the usage amount of the alloy due to the addition of the niobium element, thereby reducing the usage cost of the alloy.

Description

Technical Field

[0001] The present invention relates to the field of inoculant production, and specifically relates to an inoculant, a preparation method and a preparation device. Background Art

[0002] As is well known, an inoculant is an additive used in the production process of cast iron to improve the quality and performance of cast iron. It is usually an alloy containing elements such as iron and silicon. By adding it to molten iron, the chemical composition of cast iron can be adjusted, gases and impurities can be removed, and its fluidity and wear resistance can be improved. It enables cast iron to have better mechanical properties, improves its tensile strength, hardness and wear resistance, and at the same time can reduce the generation of shrinkage cavities and pores, and improve the surface quality of castings.

[0003] For example, in the patent document with the application number 201780040657.2, the application date of June 29, 2017, and the name "Cast Iron Inoculant and Method for Preparing Cast Iron Inoculant", it contains a granular ferrosilicon alloy, which contains about 40 to 80% by weight of silicon, about 0.1 to 10% by weight of calcium, 0 and 10% by weight of rare earths (for example, cerium and / or lanthanum), and up to 5% by weight of aluminum, with the balance being iron and normal accidental impurities, wherein the inoculant further contains 0.1 to 10% by weight of antimony oxide based on the total weight of the inoculant, wherein the antimony oxide is in granular form and is mixed or blended with the ferrosilicon alloy particles, or is added to cast iron simultaneously with the granular ferrosilicon alloy particles.

[0004] There are two main production methods for existing bainitic ductile iron: one is to subject the cast ductile iron to specific heat treatment to transform its structure into bainite; the other is to directly form bainite structure in the ductile iron during solidification by adding 3 - 4% nickel. The former saves alloying elements, but requires an increase in heat treatment equipment and heat treatment costs. The latter eliminates the trouble of heat treatment, but the large addition of nickel results in too high alloy costs. Summary of the Invention

[0005] The purpose of the present invention is to provide an inoculant, a preparation method and a preparation device to solve the above deficiencies in the prior art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] The inoculant includes 70% - 75% of silicon, 1% - 4% of niobium, 1.5% - 2% of calcium, 0.8% - 1.5% of aluminum, 2% - 4% of barium, and 14% - 23% of iron.

[0008] The preparation method of the inoculant is used to prepare the above-mentioned inoculant, and includes:

[0009] S1: Raw material ratio;

[0010] S2: Melting, which is used to melt the raw materials and then cast them into shape;

[0011] S3: Surface treatment, which is used to polish the formed raw materials;

[0012] S4: Crushing, which is used to break the formed raw materials into small particles;

[0013] S5: Screening, which is used to screen out qualified raw materials.

[0014] The preparation device of the inoculant, which is used to realize the screening step of the preparation method of the above-mentioned inoculant, includes a frame and a first screen and a second screen arranged on the frame. The mesh holes of the first screen are larger than those of the second screen. The first screen is located above the second screen, and a support mechanism is arranged below the first screen; the support mechanism includes a bracket, and the bracket is slidably arranged on the frame. When the frame vibrates, the bracket slides relative to the first screen.

[0015] The above-mentioned preparation device of the inoculant further includes a driving mechanism, and the driving mechanism is used to provide the power for the reciprocating swing of the frame.

[0016] In the above-mentioned preparation device of the inoculant, a chute is opened on the frame, a slider is arranged on the bracket, and the slider is slidably connected with the chute.

[0017] In the above-mentioned preparation device of the inoculant, the length of the first screen is greater than the length of the second screen.

[0018] In the above-mentioned preparation device of the inoculant, a top block is slidably arranged on the bracket, and a power assembly for driving the movement of the top block is further arranged on the bracket.

[0019] In the above-mentioned preparation device of the inoculant, the power assembly includes a gear and a cam fixedly connected to the gear. The gear is rotatably arranged on the slider, a toothed plate is arranged on the frame, the gear meshes with the toothed plate, a connecting rod is arranged between the plurality of top blocks, and a contact rod is further arranged on the top block, and the contact rod is located on the movement stroke of the cam.

[0020] In the above-mentioned preparation device of the inoculant, a blockage clearing part is arranged on the bracket.

[0021] In the above-mentioned preparation device of the inoculant, a feed hopper and a collection hopper are arranged on the frame.

[0022] In the above technical solution, the inoculant provided by the present invention adds 1%-4% of niobium element to the components of the inoculant. The niobium element can not only increase the tensile strength, flexural strength and impact toughness of cast iron, but also reduce the usage amount of the alloy due to the addition of the niobium element, thereby reducing the usage cost of the alloy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0024] Figure 1 Schematic diagram of the overall structure provided by an embodiment of the present invention;

[0025] Figure 2 Front view structure schematic diagram provided by another embodiment of the present invention;

[0026] Figure 3 For Figure 2 Overall sectional view structure diagram at a-a in

[0027] Figure 4 For Figure 2 Partial sectional view structure diagram at a-a in

[0028] Figure 5 For Figure 2 Partial sectional view structure diagram at b-b in

[0029] Figure 6 For Figure 4 Partial enlarged view of the local structure at A in

[0030] Figure 7 Effect of niobium on the tensile strength and flexural strength of gray cast iron (circular marks represent tensile strength, square marks represent flexural strength);

[0031] Figure 8 Effect of niobium on the impact toughness of gray cast iron;

[0032] Figure 9 Effect of niobium on the hardness of gray cast iron;

[0033] Figure 10 Effect of niobium on the relative wear rate of gray cast iron;

[0034] Figure 11 Effect of niobium on the tensile strength of undercooled gray cast iron;

[0035] Figure 12 Effect of niobium on the impact toughness of undercooled gray cast iron;

[0036] Figure 13 The effect of niobium content on the hardness of undercooled grey cast iron;

[0037] Figure 14 The effect of niobium on the tensile strength of chilled cast iron;

[0038] Figure 15 The effect of niobium on the impact toughness of chilled cast iron;

[0039] Figure 16 Effect of niobium on the hardness of chilled cast iron.

[0040] Description of reference numerals:

[0041] 1. Frame; 2. First screen; 3. Second screen; 4. Bracket; 5. Clearing part; 6. Slide; 7. Sliding block; 8. Top block; 9. Gear; 10. Cam; 1001. First part; 1002. Second part; 11. Tooth plate; 12. Connecting rod; 13. Abutting rod; 1301. First section; 1302. Second section; 14. First spring; 15. Mounting groove; 16. Feed hopper; 17. Collecting hopper; 18. Sliding frame; 19. Second spring; 20. Active cavity; 21. Third spring; 22. Sliding part; 23. Locking block; 24. Active groove; 25. Abutting part; 26. Mounting part; 27. Fourth spring; 28. Avoiding groove. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0043] In the description of the present invention, it is necessary to understand that Figure 6 The orientation of the middle tooth plate 11 relative to the gear 9 is up, and vice versa. The orientation of the first part 1001 relative to the second part 1002 is left, and vice versa. The orientation or position relationship indicated by the terms "center", "length", "width", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0044] Reference Figure 1-16 ;

[0045] Embodiment 1, including 70%-75% silicon, 1%-2% niobium, 1.5%-2% calcium, 0.8%-1.5% aluminum, 2%-4% barium and 14%-23% iron (the above ratio scheme is to calculate the content of metallic calcium and each component in ferrosilicon, ferroniobium, silicon-barium and other alloys separately).

[0046] The preparation method of the inoculant provided by the embodiment of the present invention is used to prepare the above-mentioned inoculant, and includes:

[0047] S1: Raw material ratio, quantitatively weighing the above various raw materials;

[0048] S2: Melting, which is used to melt the raw materials and then cast them into shape. Adjust the temperature of the induction furnace to 1600 °C, and add the above-matched raw materials into the induction furnace (the feeding order is 2 / 3 ferrosilicon alloy, metallic calcium, ferro-niobium alloy, ferrosilicon barium alloy, and the remaining 1 / 3 ferrosilicon alloy). Melt for 40 min. After the raw materials in the furnace are completely melted and clarified, stir and let stand for 30 seconds, then take out the furnace and cast it into a water-cooled mold. Take out the raw materials after cooling in the mold for 5 - 8 minutes;

[0049] S3: Surface treatment, during the melting process of the raw materials, the elements in the alloy will react with oxygen in the atmosphere to form oxides, and after the alloy liquid is melted and clarified, impurities float on the surface of the alloy. After the raw materials are formed, the impurities will adhere to the surface of the raw materials, and then the formed raw materials are polished to remove the impurities and oxides on the surface of the raw materials;

[0050] S4: Crushing, crushing the formed raw materials into small particles through a crusher;

[0051] S5: Screening, a vibrating screen is set below the crusher. The vibrating screen is provided with two layers of sieve meshes. The mesh size of the upper sieve mesh is 3 mm, and the mesh size of the lower sieve mesh is 1 mm. The size of the raw materials between the two layers of sieve meshes is 1 - 3 mm, and this size is also the size of the qualified products. Then collect the qualified products uniformly;

[0052] The raw materials above the upper sieve mesh will be finely crushed again;

[0053] The raw materials below the lower sieve mesh will be melted again, and the above steps are repeated.

[0054] Example 2: It includes 70% - 75% of silicon, 2% - 3% of niobium, 1.5% - 2% of calcium, 0.8% - 1.5% of aluminum, 2% - 4% of barium, and 14% - 23% of iron.

[0055] The preparation method is the same as that of Example 1.

[0056] Example 3: It includes 70% - 75% of silicon, 3% - 4% of niobium, 1.5% - 2% of calcium, 0.8% - 1.5% of aluminum, 2% - 4% of barium, and 14% - 23% of iron.

[0057] The preparation method is the same as that of Example 1.

[0058] Comparative example: 70%-75% silicon, 1.5%-2% calcium, 0.8%-1.5% aluminum, 2%-4% barium and 14%-23% iron.

[0059] The preparation method is the same as that of Example 1.

[0060] It should be noted that Figures 7-10 The value of the horizontal axis in is experimentally calculated, and the specific calculation method is as follows: 1 ton of molten iron is added with the inoculants of the above three embodiments and the comparative example, and the amount of inoculant added is 1 ton of molten iron plus 1%-1.6% of the inoculant by weight, and then sampling experiments are performed to obtain the niobium content in the molten iron, and then four points, namely the four numbers on the horizontal axis, are selected (two samples are taken in Example 3), and the residual value of niobium after burning and oxidation in the molten iron and being taken out with impurities (the horizontal axis 0 corresponds to the comparative example, the horizontal axis 0.06 corresponds to Example 1, the horizontal axis 0.19 corresponds to Example 2, and the horizontal axes 0.31 and 0.355 correspond to the two sets of values in Example 3, where Figures 7-10 The unit of the horizontal axis is ‰, and the unit of the vertical axis is MPa, J / cm2, HB, %).

[0061] Depend on Figures 7-10 It can be seen that before the niobium content is 0.31, with the increase of niobium content, the tensile strength, bending strength, impact toughness and hardness of gray cast iron show an overall upward trend. The graphite of gray cast iron containing niobium has no tendency to be overcooled. After the addition of niobium, the graphite is still flaky. Therefore, niobium gray cast iron maintains the excellent anti-friction performance of ordinary gray cast iron. In addition, niobium has no effect on the amount of pearlite. Its influence on the matrix structure of gray cast iron is to refine the eutectic group. After the addition of niobium, a large amount of niobium carbonitride is formed, which reduces the relative wear rate of gray cast iron.

[0062] It should be noted that Figures 11-13 The abscissa represents the content of niobium in the casting (where abscissa 0 corresponds to the comparative example, abscissas 0.022 and 0.028 correspond to the two sets of values in Example 1, abscissa 0.05 corresponds to Example 2, and abscissa 0.099 corresponds to Example 3, and Figures 11-13 The unit of the horizontal axis is ‰, and the unit of the vertical axis is MPa, J / cm2, HB).

[0063] Depend on Figures 11-13 It can be seen that before the niobium content is 0.05, the tensile strength, impact toughness and hardness of cold gray cast iron are improved with the increase of niobium content. When the niobium content increases to 0.05, the above indicators reach the maximum value. The mechanical properties decrease with the further increase of niobium content. The improvement of mechanical properties of cold gray cast iron is due to the fact that the addition of niobium increases the amount of ledeburite structure on the one hand, and at the same time, the eutectic austenite transformation product in the ledeburite structure is transformed into pearlite again.

[0064] It should be noted that Figures 14-16 The abscissa represents the content of niobium in the casting (wherein the abscissa 0 corresponds to the comparative example, the abscissas 0.022 and 0.028 correspond to the two sets of values in Example 1, the abscissa 0.05 corresponds to Example 2, and the abscissas 0.08 and 0.099 correspond to the two sets of values in Example 3, and Figures 14-16 The unit of the horizontal axis is ‰, and the unit of the vertical axis is MPa, J / cm2, HB).

[0065] Depend on Figures 14-16 It can be seen that before the niobium content is 0.05, as the niobium content increases, the tensile strength, impact toughness and hardness of the chilled cast iron increase. This is because the addition of niobium increases the amount of ledeburite structure and changes the eutectic austenite transformation product in the ledeburite structure from pearlite to bainite. However, further increasing the niobium content will reduce the amount of ledeburite and change the eutectic austenite transformation product of ledeburite back to pearlite.

[0066] In summary, adding an appropriate amount of niobium (i.e. the niobium content corresponding to the highest value in the figure) to the inoculant can not only increase the tensile strength, bending strength, impact toughness and hardness of cast iron, but also reduce the wear rate of gray cast iron, chilled gray cast iron and chilled cast iron.

[0067] Moreover, due to the addition of niobium, the amount of alloy used can be reduced, thereby reducing the cost of using the alloy.

[0068] The preparation device of the inoculant provided in an embodiment of the present invention is used to implement the screening step in the above-mentioned preparation method of the inoculant, including a frame 1 and a first screen 2 and a second screen 3 arranged on the frame 1, the mesh of the first screen 2 is larger than the mesh of the second screen 3, and the first screen 2 is located above the second screen 3, and a supporting mechanism is arranged below the first screen 2; the supporting mechanism includes a bracket 4, and the bracket 4 is slidably arranged on the frame 1, and when the frame 1 vibrates, the bracket 4 and the first screen 2 slide relative to each other.

[0069] Specifically, the frame 1 is preferably a square frame or a circular frame, and the corresponding sieve mesh is a rectangular sieve mesh or a circular sieve mesh. Preferably, the mesh size of the first sieve mesh 2 is 3 mm, and the mesh size of the second sieve mesh 3 is 1 mm. The raw materials to be screened are placed on the first sieve mesh 2, and the frame 1 is driven to vibrate by means of a vibrating motor or other mechanisms, thereby driving the first sieve mesh 2 and the second sieve mesh 3 to vibrate synchronously. This can make the raw materials with a diameter of 1-3 mm remain on the second sieve mesh 3, and then the raw materials on the second sieve mesh 3 can be collected uniformly. This is the prior art and will not be elaborated. One of the core innovations of the embodiments of the present invention is that in order to prevent the overall downward depression of the first sieve mesh 2, a bracket 4 is slidably arranged on the frame 1. The bracket 4 can be in the shape of a "well" character, a "rice" character or other grid shapes. The bracket 4 plays a supporting role for the first sieve mesh 2. Activity grooves 24 are opened inside the two side walls of the frame 1, and the ends of the bracket 4 slide horizontally in the activity grooves 24, and its upper surface fits with the lower surface of the first sieve mesh 2. The function of such a setting is that when the vibrating motor drives the frame 1 to vibrate, since the bracket 4 is slidably connected to the frame 1, the movement between the first sieve mesh 2 and the bracket 4 is asynchronous. Therefore, relative movement will occur between the bracket 4, the frame 1 and the first sieve mesh 2, so that the bracket 4 can slide relative to the lower surface of the first sieve mesh 2. On the one hand, it can play a supporting role for the first sieve mesh 2. On the other hand, since the main body part of the bracket 4 has a width and a length, its main body part will have a blocking effect on the falling of the raw materials, so that a small part of the raw materials will accumulate above the main body part of the bracket 4. In this embodiment, since the relative position between the bracket 4 and the first sieve mesh 2 is not fixed, the continuous accumulation of the materials above the main body part of the bracket 4 can be avoided.

[0070] It should be noted that when screening raw materials, some raw materials will be stuck inside the mesh holes of the first sieve mesh 2, which will affect the screening efficiency of the first sieve mesh 2. Further, a clogging clearing part 5 is arranged on the bracket 4. The radial cross-section of the clogging clearing part 5 is a right trapezoid, and the inclined surface corresponding to the hypotenuse of the right trapezoid is located below the first sieve mesh 2. Specifically, the bracket 4 includes a plurality of long rods and a plurality of short rods that are vertically and alternately arranged, and is in an overall grid shape, and the bracket 4 also slides horizontally along the axial direction of the short rods. The clogging clearing parts 5 are arranged in parallel along the length direction of the long rods and are symmetrically arranged on both sides of each long rod. The function of such a setting is that when the bracket 4 slides relative to the first sieve mesh 2, when raw materials are stuck inside the mesh holes, the inclined surface of the clogging clearing part 5 will abut against the stuck raw materials, thereby providing an upward driving force for the raw materials and pushing out the raw materials blocking the mesh holes, so as to play a role in clearing clogs.

[0071] Further, an inclined surface is arranged on the bottom wall of the activity groove 24. When the raw materials fall into the activity groove 24, they will slide down along the inclined surface onto the second sieve mesh 3, thereby avoiding the accumulation of raw materials inside the activity groove 24.

[0072] Furthermore, it further includes a driving mechanism for providing the power for the reciprocating swing of the frame 1. The driving mechanism can be a cooperating structure such as a motor, an elastic member, and an eccentric wheel, which is used to drive the frame 1 to move horizontally back and forth. This is prior art and will not be elaborated.

[0073] Preferably, a sliding groove 6 is formed on the frame 1, and a sliding block 7 is arranged on the bracket 4. The sliding block 7 is slidably connected to the sliding groove 6. Specifically, the sliding groove 6 is formed on the side wall of the movable groove 24, and the sliding block 7 is arranged above the bracket 4 and is slidably connected to the sliding groove 6. Through the sliding cooperation between the sliding block 7 and the sliding groove 6, the bracket 4 can stably slide below the first screen 2.

[0074] Furthermore, the length of the first screen 2 is greater than the length of the second screen 3. The function of this setting is that since the mesh diameter of the first screen 2 is larger than that of the second screen 3, at the same vibration frequency of the frame 1, the screening ability of the first screen 2 for the raw materials is greater than that of the second screen 3. If the feeding is based on the screening ability of the first screen 2 (if the feeding is based on the screening ability of the second screen 3, the overall screening efficiency will be reduced), excessive accumulation of raw materials will occur above the second screen 3, thus reducing the screening effect of the raw materials. Therefore, the first screen 2 is set to be longer, so that the materials above the second screen 3 have a larger screening space to adapt to the screening ability of the first screen 2.

[0075] Furthermore, a top block 8 is slidably arranged on the bracket 4, and the bracket 4 is further provided with a power assembly for driving the movement of the top block 8. Specifically, the top block 8 is vertically arranged, and an arc surface is arranged at its top end, and the arc surface abuts against the lower surface of the first screen 2. A plurality of top blocks 8 are evenly arranged on the bracket 4, and the power assembly is a linear reciprocating driving structure such as an electric push rod. The function of this setting is that during screening, the power assembly is started, and the power assembly drives the top block 8 to move upward, so that the first screen 2 can be actively lifted (causing the middle of the first screen 2 to bulge, or the first screen 2 is vertically slidably arranged on the frame 1 and the first screen 2 is lifted as a whole). Since the top block 8 is arranged on the main body part of the bracket 4, the first screen 2 corresponding to the main body part of the bracket 4 will be lifted, so that the raw materials on the first screen 2 corresponding to the main body part slide to both sides, that is, slide to a position far from the main body part of the bracket 4, thereby further avoiding the accumulation of raw materials above the bracket 4.

[0076] As another embodiment of the present invention, the power assembly includes a gear 9 and a cam 10 fixed to the side end surface of the gear 9, the gear 9 is rotatably set on the slider 7, a toothed plate 11 is provided on the frame 1, the gear 9 is meshed with the toothed plate 11, a connecting rod 12 is provided between the plurality of top blocks 8, an abutment rod 13 is also provided on the top block 8, the abutment rod 13 extends into the movable groove 24, and one end of the abutment rod 13 in the movable groove 24 is located on the movement stroke of the cam 10. Specifically, the gear 9 is rotatably set on the side wall of the slider 7, the toothed plate 11 is provided on the inner top wall of the movable groove 24, and is arranged corresponding to the position of the gear 9, and the gear 9 and the toothed plate 11 are each provided with two, so as to Figure 3 and 4 For example, the toothed plate 11 on the left is located above the gear 9, and the toothed plate 11 on the right is located below the gear 9, so that when the bracket 4 slides to the left, the cams 10 on both sides rotate upward synchronously, the cams 10 and the gear 9 are coaxially arranged, and the adjacent top blocks 8 are connected as a whole by the connecting rod 12. There are two abutment rods 13, which are in a 冂 shape, one end of which is fixed to the top block 8 at the edge position, and the other end is located on the movement stroke of the cam 10 away from the central axis of the gear 9. An avoidance groove 28 for lifting and lowering the connecting rod 12 and the top block 8 is provided inside the bracket 4. If the rod member composed of the bracket 4 is hollow, the inside is the avoidance groove 28, and the inner bottom wall of the avoidance groove 28 is provided with an installation groove 15, and a first spring 14 is provided between the top block 8 and the inner bottom wall of the installation groove 15. The effect of such a setting is that when the frame 1 is stationary, the first spring 14 is in a stretched state, and the top block 8 and the connecting rod 12 are at the bottom under the elastic force of the first spring 14. When screening, When the bracket 4 slides to the left relative to the movable groove 24, the slider 7 drives the gear 9 to move synchronously. Since the gear 9 is meshed with the toothed plate 11, the gear 9 will rotate itself during its movement, thereby driving the cams 10 on the left and right sides to rotate upward, so that the ends of the cams 10 on both sides abut against the lower surfaces of the ends of the two abutting rods 13 respectively, thereby driving the abutting rods 13, the connecting rods 12 and the top block 8 to move up passively to prevent the raw materials from accumulating above the main body of the bracket 4. When the connecting rods 12 and the top block 8 move up to the highest point, the bracket 4 slides to the left to the maximum value. At this time, the bracket 4 will slide to the right, thereby driving the cam 10 to rotate in the opposite direction, so that the abutting effect between the cam 10 and the abutting rod 13 disappears, and the abutting rod 13, the connecting rod 12 and the top block 8 are automatically reset under the action of the first spring 14. This is repeated, which will cause the first screen 2 to produce a vertical vibration effect, thereby accelerating the screening efficiency of the first screen 2.

[0077] Furthermore, a feed hopper 16 and a collection hopper 17 are provided on the frame 1. The feed hopper 16 is arranged above the frame 1 and is used for assisting in feeding materials onto the first screen 2. The collection hopper 17 is located below the second screen 3 and is used for uniformly collecting small particles and unqualified raw materials.

[0078] As another embodiment of the present invention, the abutting rod 13 includes a first section 1301 and a second section 1302. The first section 1301 is fixedly connected to the top block 8. A sliding frame 18 is provided on the bracket 4. The second section 1302 is slidably connected to the sliding frame 18, and the first section 1301 is located on the movement stroke of the second section 1302. A second spring 19 is provided between the second section 1302 and the sliding frame 18. Specifically, the sliding frame 18 is fixedly connected to the side surface of the bracket 4 and is L-shaped. The first section 1301 is fixedly connected to the top block 8. The second section 1302 is slidably arranged on the vertical section of the sliding frame 18 to achieve vertical movement limitation. The end of the first section 1301 is located above the end of the second section 1302. The second spring 19 is provided between the horizontal section of the sliding frame 18 and the second section 1302. The purpose of such a setting is that when the gear 9 drives the cam 10 to rotate upward, the cam 10 will abut against the second section 1302 and drive the second section 1302 to move upward. During the upward movement of the second section 1302, it will abut against the first section 1301, thereby driving the first section 1301 and the top block 8 to move upward passively and stretching the second spring 19. The cam 10 continues to rotate, causing the cam 10 to separate from the second section 1302. The second section 1302 automatically resets under the elastic force of the second spring 19. During the reset process of the second section 1302, vibrations will be generated, and during the vibration process, it will repeatedly impact the first section 1301, thereby driving the top block 8 to move upward repeatedly, and driving the first screen 2 to vibrate repeatedly to improve the screening efficiency. When the cam 10 rotates in the reverse direction, the cam 10 will abut against the upper surface of the second section 1302, causing the second section 1302 to move downward and compressing the second spring 19 to achieve avoidance. When the cam 10 is far away from the second section 1302, the second section 1302 automatically resets under the elastic force of the second spring 19, and the second section 1302 will still repeatedly impact the first section 1301 to achieve the effect of improving the screening efficiency.

[0079] As another embodiment of the present invention, the cam 10 includes a first part 1001 and a second part 1002 that are slidably connected to each other. An activity cavity 20 is formed inside the first part 1001. The second part 1002 is slidably connected to the activity cavity 20, and a third spring 21 is disposed between the second part 1002 and the activity cavity 20. Specifically, the first part 1001 is fixedly connected to the gear 9. A sliding part 22 is provided on the second part 1002. The sliding part 22 slides along the inner wall of the activity cavity 20. The third spring 21 is disposed between the side wall of the activity cavity 20 and the sliding part 22, and the third spring 21 is always in a stretched state. The effect of such a setting is that when the frame 1 vibrates at a high frequency, the relative sliding speed between the slider 7 and the chute 6 will increase, thereby driving the gear 9 to rotate at a high speed. The gear 9 will drive the cam 10 to rotate synchronously at a high speed. When the centrifugal force received by the second part 1002 is much greater than the elastic force of the third spring 21, it will drive the sliding part 22 to slide outward of the activity cavity 20, and further stretch the third spring 21. At the same time, the overall length of the cam 10 will increase, so that the contact area between the second part 1002 and the second section 1302 increases. Therefore, during the rotation of the cam 10, the upward movement distance of the second section 1302 will increase, so that the upward movement distance of the top block 8 is large. On the contrary, when the vibration frequency of the frame 1 is low, the overall length of the cam 10 is small, so that the contact area between the second part 1002 and the second section 1302 decreases, thereby reducing the upward movement distance of the top block 8. In this way, the jacking height of the top block 8 can be passively adjusted according to the vibration frequency of the frame 1.

[0080] It should be noted that when the vibration of the frame 1 is too fast (or the vibration amplitude is too large and the driving mechanism drives abnormally), the bracket 4 will severely impact the side wall of the movable slot 24, which may cause damage to the frame 1 or the bracket 4. And when the vibration of the frame 1 is too fast, the screening ability of the first screen 2 is already sufficient. At this time, it is not necessary for the bracket 4 to slide, and the screening can also be completed. Further, a high-speed self-locking mechanism is provided on the cam 10. The high-speed self-locking mechanism includes a locking block 23. The locking block 23 is elastically arranged on the side wall of the movable slot 24. An abutting portion 25 is provided on the second section 1302. The locking block 23 is located on the movement stroke of the abutting portion 25. Specifically, an installation portion 26 is provided on the side wall of the movable slot 24. The elastic arrangement means that a fourth spring 27 is provided between the locking block 23 and the installation portion 26. The top of the locking block 23 is provided with a wedge surface. The abutting portion 25 is arranged on the side surface of the second part 1002 close to the first part 1001. The abutting portion 25 is also provided with a wedge surface. When the rotation speed of the cam 10 is too fast, the wedge surface of the locking block 23 is located on the movement stroke of the wedge surface of the abutting portion 25. The function of such a setting is that when the vibration of the frame 1 is too fast or the vibration amplitude is too large, the rotation speed of the cam 10 will be too fast, which will cause the centrifugal force received by the second part 1002 to be too large, so that the sliding distance of the sliding portion 22 towards the outside of the movable cavity 20 increases. At this time, the wedge surface of the locking block 23 is located on the movement stroke of the wedge surface of the abutting portion 25. When the two are in mutual abutment, the locking block 23 will slide downward along the installation portion 26 and stretch the fourth spring 27. After the wedge surfaces of the two are in abutment, the locking block 23 will automatically reset under the elastic force of the fourth spring 27. At this time, the vertical surface of the locking block 23 abuts against the straight surface of the abutting portion 25, so that the cam 10 cannot rotate in the reverse direction, and thus the cam 10 is locked between the locking block 23 and the side wall of the movable slot 24. Since the cam 10 is fixedly connected to the gear 9, the gear 9 cannot rotate. And because the gear 9 meshes with the toothed plate 11, the bracket 4 can be prevented from sliding along the chute 6, so as to passively lock the position of the bracket 4 to avoid equipment damage caused by the too-fast vibration of the frame 1. After the screening is completed, the cam 10 can be manually reset after shutdown.

[0081] In an alternative embodiment, an independent support mechanism can also be added under the second screen 3, or the support mechanism under the second screen 3 can be connected to the support mechanism under the first screen 2 to achieve synchronous sliding support of the two.

[0082] Only some exemplary embodiments of the present invention have been described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, without departing from the spirit and scope of the present invention, the described embodiments can be modified in various different ways. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. Preparation device for inoculant, the inoculant comprising: Silicon with a weight percentage of 70%-75%, niobium of 1%-4%, calcium of 1.5%-2%, aluminum of 0.8%-1.5%, barium of 2%-4% and iron of 14%-23%. The preparation method of the inoculant includes: S1: raw material ratio; S2: melting, which is used to melt the raw materials and then cast them into shape; S3: surface treatment, which is used to polish the formed raw materials; S4: crushing, which is used to break the formed raw materials into small particles; S5: screening, which is used to screen out raw materials with different radial sizes. The preparation device of the inoculant is used to realize the screening step of the preparation method of the inoculant, including a frame and a first screen and a second screen arranged on the frame. The mesh of the first screen is larger than that of the second screen. The first screen is located above the second screen. It is characterized in that a support mechanism is arranged below the first screen; The support mechanism includes a bracket, and the bracket is slidably arranged on the frame. When the frame vibrates, the bracket and the first screen slide relative to each other; The bracket includes a plurality of long rods and a plurality of short rods arranged vertically and alternately, and the whole is in a grid shape; A chute is opened on the frame, a slider is arranged on the bracket, and the slider is slidably connected with the chute; A top block is slidably arranged on the bracket, and a power component for driving the top block to move is also arranged on the bracket; The power component includes a gear and a cam fixedly connected to the side end face of the gear. The gear is rotatably arranged on the slider. A toothed plate is arranged on the frame, and the gear meshes with the toothed plate. A connecting rod is arranged between the plurality of top blocks, and an abutting rod is also arranged on the top block. The abutting rod extends into the movable groove, and one end of the abutting rod in the movable groove is located on the movement stroke of the cam; When the frame vibrates, the movements of the first screen and the bracket are out of sync. Therefore, relative movements will occur between the bracket and the frame and the first screen, causing the lower surfaces of the bracket and the first screen to slide relative to each other; The abutting rod includes a first section and a second section; The cam includes a first part and a second part that are slidably connected to each other. An activity cavity is opened inside the first part, and the second part is slidably connected with the activity cavity, and a third spring is arranged between the second part and the activity cavity; A high-speed self-locking mechanism is arranged on the cam. The high-speed self-locking mechanism includes a locking block. The locking block is elastically arranged on the side wall of the activity groove. An abutting part is arranged on the second part, and the locking block is located on the movement stroke of the abutting part.

2. The preparation device of the inoculant according to claim 1, characterized in that, It also includes a driving mechanism, and the driving mechanism is used to provide the power for the reciprocating swing of the frame.

3. The preparation device of the inoculant according to claim 1, characterized in that, The length of the first screen is greater than the length of the second screen.

4. The preparation device of the inoculant according to claim 1, characterized in that, A clogging clearing part is arranged on the bracket.

5. The preparation device of the inoculant according to claim 1, characterized in that, A feed hopper and a collection hopper are arranged on the frame.

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