Extrusion pelletizer
By introducing a secondary water spraying component into the extrusion pelletizer, the problem of lack of secondary water addition in the extrusion pelletizing of chromium concentrate powder was solved, which improved the pellet strength and particle size uniformity, and reduced the amount of binder and energy consumption.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 内蒙古自治区产业技术创新中心(内蒙古自治区科学技术检测实验中心)
- Filing Date
- 2025-07-09
- Publication Date
- 2026-07-14
AI Technical Summary
Existing chromium concentrate extrusion pelletizers lack a secondary water replenishment structure before extrusion, resulting in insufficient adhesion between particles, high porosity, and insufficient pellet strength, thus failing to effectively improve the quality of green pellets.
An extrusion pelletizer was designed, comprising a machine body, a side shell, a rotating extrusion die wheel, and a secondary water spraying assembly. The assembly is connected to the side shell via a connecting component to form an intermediate feeding hopper, and water is added within the extrusion space to achieve secondary water addition, reduce material bridging effect, and improve particle adhesion.
It achieves effective moisture replenishment during extrusion, reduces binder usage by 10%, has a short process flow and low energy consumption, and produces pellets with higher wet pellet compressive strength, dry pellet compressive strength and green pellet drop strength than traditional technologies, and has good particle size uniformity.
Smart Images
Figure CN224494276U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of chromium concentrate extrusion equipment technology, and in particular to an extrusion pelletizer. Background Technology
[0002] Currently, chromium ore resources are characterized by a large amount of low-grade ore. The raw material for chromium ore is chromium concentrate powder directly, without the need for grinding. The chromium concentrate powder is mixed with a binder, a small amount of water is added, and then extruded to form pellets of the target size.
[0003] In existing technologies, a complete processing flow includes multiple steps such as drying, batching, grinding, pelletizing, and drying. The key steps in the traditional process for chromium concentrate powder extrusion pelletizing technology are:
[0004] (1) First, dry the chromite powder. Then, mix the dried chromite powder with the binder in a certain proportion and perform dry grinding.
[0005] (2) The dry-ground mixture enters the moistening process. Before the mixture enters the moistening mill, a water atomizing device is used to add 6-7% water for pre-humidification. The moistening process requires grinding the mixture to ≥90% of 200 mesh.
[0006] Adding water before extrusion causes problems such as loose powder particles shifting under pressure, filling gaps, increasing packing density, overcoming friction and geometric resistance between particles, resulting in tighter particle arrangement, forcing particles to slide and roll, forming a more efficient packing structure (such as hexagonal close packing), and significantly reducing porosity.
[0007] In addition, when the pressure exceeds the yield strength of the particles, the particles undergo plastic deformation, the contact area increases, and mechanical interlocking is formed. During extrusion, the surface energy is reduced by adding water twice, which promotes adhesion between particles. Furthermore, the solid bridge formed after the water evaporates and is dried can further increase the strength of the pellets. The binder forms capillary forces at the particle contact points, which enhances the temporary bond.
[0008] In summary, the mixture of chromium concentrate powder after rubbing and grinding is transported to a disc pelletizer for pelletizing. If an appropriate amount of water (1-2%) is added during the pelletizing process, the quality and particle size of the green pellets can be improved. However, due to structural configuration, the existing extrusion pelletizer cannot effectively implement the corresponding water addition configuration. Utility Model Content
[0009] This invention aims to solve the technical problem of the lack of a secondary water replenishment structure in the chromium concentrate pelletizing process in the prior art, and provides an extrusion pelletizing machine.
[0010] To solve the above-mentioned technical problems, the specific technical solution of this utility model is as follows:
[0011] An extrusion pelletizing machine has a machine body, the machine body comprising:
[0012] A side shell, forming an extrusion space, wherein a rotating extrusion die wheel is provided within the extrusion space and is driven by a drive component, further comprising:
[0013] The hopper assembly is able to form a fixed connection with the connecting surface of the side shell through a connecting component;
[0014] The connecting component forms an intermediate feeding bin, which connects the hopper and the extrusion space;
[0015] The area of the connecting component in the horizontal cross section is larger than the area of the hopper in the horizontal cross section;
[0016] The connecting component is connected to a secondary water spraying assembly, which is used to replenish water to the intermediate feeding hopper, i.e., the extrusion space.
[0017] Preferably, one end of the extrusion space forms a connection port, and an isolation plate is provided on the inner wall of the side shell. The isolation plate is L-shaped, and the edge of the isolation plate is located at the connection port.
[0018] The long side of the isolation plate is attached to the inner wall of the side shell.
[0019] Preferably, a mounting component is fixedly connected to the connecting surface, and the first end of the mounting component is coplanar with the short side of the isolation plate;
[0020] The isolation plate is arranged adjacent to the mounting component.
[0021] Preferably, the hopper assembly includes:
[0022] A hopper connecting plate, which is connected to the hopper;
[0023] The hopper connecting plate is provided with a first connecting extension in the circumferential direction.
[0024] Preferably, the connecting component includes:
[0025] The first connecting compartment has a second connecting extension on both the upper and lower parts of its outer periphery;
[0026] The second connecting compartment has a third connecting extension on both the upper and lower parts of its outer periphery;
[0027] The first connecting extension, the second connecting extension, and the third connecting extension cooperate with each other to connect the first connecting compartment and the second connecting chamber.
[0028] The first connecting chamber is connected to the hopper;
[0029] The second connecting compartment is connected to the mounting component and supported by the short side of the partition plate.
[0030] Preferably, the first connecting extension, the second connecting extension, and the third connecting extension are provided with corresponding threaded connecting holes, and locking threaded fasteners are connected in the threaded connecting holes.
[0031] Preferably, the threaded connection holes are offset on the first connection extension, the second connection extension, and the third connection extension.
[0032] Preferably, the secondary water spraying assembly includes:
[0033] Multiple water inlet pipes are inserted circumferentially from the first connecting chamber and connected to a spray head that sprays in the direction of the compression space.
[0034] A spray hood can be screwed onto the spray head;
[0035] The multiple water inlet pipes are located outside the first connecting chamber and are connected to a water supply pipe at one end.
[0036] A control valve is installed on the water inlet pipe, and the water supply pipe is connected to a water supply bus.
[0037] This utility model has the following beneficial effects:
[0038] Firstly, this technical solution is particularly suitable for improvement on existing extrusion pelletizing machines, and is easy to disassemble, install, and maintain, which can greatly save costs and utilizes limited space to configure secondary water-adjacent components.
[0039] Secondly, the connecting components are designed to reduce the "bridging effect" of materials in the hopper. Specifically, the area of the connecting components in the horizontal cross-section is larger than the area of the horizontal cross-section of the hopper.
[0040] Thirdly, this technical solution can reduce the amount of binder used, and the actual total water consumption can also be reduced by about 10%. The process flow is short and the energy consumption is low. The wet ball compressive strength, dry ball compressive strength and green ball drop strength of the extrusion-molded pellet products are all higher than those of products produced by traditional production technology, and the particle size is uniform and the molding is more stable. Attached Figure Description
[0041] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0042] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;
[0043] Figure 2This is a schematic diagram of the connecting component of this utility model;
[0044] Figure 3 This is a schematic diagram of the first connecting extension and the second connecting extension of the present invention.
[0045] Figure 4 This is a schematic diagram of the locking threaded fastener of this utility model;
[0046] Figure 5 This is a schematic diagram of the secondary water spraying component of this utility model;
[0047] Figure 6 This is a schematic diagram of the spray head of this utility model.
[0048] The reference numerals in the figure are:
[0049] 1. Side shell; 2. Extrusion space; 3. Rotating extrusion die wheel;
[0050] Hopper assembly 10, connecting part 20, connecting surface 101, intermediate discharge bin 201;
[0051] 4 hoppers, 30 secondary water spraying components, and 111 isolation plates;
[0052] Mounting component 112, hopper connecting plate 12;
[0053] First connecting extension 110, second connecting extension 120, first connecting compartment 210;
[0054] Second connecting compartment 220, third connecting extension 130;
[0055] Threaded connection hole 140, locking threaded fastener 150;
[0056] Water inlet pipe 301, spray head 302, spray hood 303, water supply pipe 304, water supply main line 305. Detailed Implementation
[0057] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. It should be noted that, for ease of description, in this application, "left side" is referred to as "first end", "right side" as "second end", "upper side" as "first end", and "lower side" as "second end" in the current view. The purpose of such description is to clearly express the technical solution and should not be construed as an improper limitation of the technical solution of this application.
[0058] This invention addresses the technical problem of the lack of a secondary water replenishment structure in the existing chromium concentrate briquetting process. It provides an extrusion pelletizing machine that achieves secondary water addition during the extrusion process. Based on the principles and advantages of secondary water addition described in the background art, this technology directly uses chromium concentrate as the material and employs extrusion molding. Compared to traditional pelletizing technology, it reduces the amount of binder used, and the actual total water consumption can be reduced by 10%. The process flow is shorter, energy consumption is lower, and the wet pellet compressive strength, dry pellet compressive strength, and green pellet drop strength of the extruded pellets are all higher than those produced by traditional technology. Furthermore, the particle size is more uniform, and the molding is more stable. (See attached figure for details.) Figure 1 , 2 As shown, the extrusion pelletizing machine, similar to existing technologies, includes a machine body comprising a side shell 1 forming an extrusion space 2. The extrusion space 2 contains two sets of rotating extrusion die wheels 3, each set having a hemispherical die. The rotating extrusion die wheels 3 rotate to extrude material and form pellets. The rotating extrusion die wheels 3 are driven by a drive component. Existing technologies use two sets of meshing gears coaxially arranged with the corresponding rotating extrusion die wheels 3, driven by a motor or a sprocket. The difference from existing technologies lies in the inclusion of a hopper assembly 10 for secondary water replenishment and optimized pelletizing. The hopper assembly 10 can... The connecting component 20 is fixedly connected to the connecting surface 101 of the side shell 1. The connecting component 20 forms an intermediate feeding hopper 201, which connects the hopper 4 and the extrusion space 2. The connecting component 20 can also reduce the "bridging effect" of materials in the hopper 4. Specifically, the area of the horizontal cross-section of the connecting component 20 is larger than the area of the horizontal cross-section of the hopper 4. In a further configuration, the connecting component 20 is connected to a secondary water spraying component 30, which is used to replenish water to the intermediate feeding hopper 201, i.e., the extrusion space 2. Thus, this technical solution not only has a reasonable configuration of the secondary water spraying component 30, but the addition of the connecting component 20 can also avoid the bridging effect of materials. Moreover, this technical solution is particularly suitable for improvement on existing extrusion pelletizing machines, which can greatly save costs.
[0059] In one specific embodiment, please refer to Figure 2 As shown, one end of the extrusion space 2 forms a connection port, and an isolation plate 111 is provided on the inner wall of the side shell 1. The isolation plate 111 is L-shaped, and the edge of the isolation plate 111 is located at the connection port. The long side of the isolation plate 111 is attached to the inner wall of the side shell 1. The isolation plate 111 further provides a guarantee of configuration strength, can connect with the inner wall of the side shell 1, prevent material from sticking to the wall, and at the same time provide a support base for the configuration of the connecting component 20, ensuring stability.
[0060] In one specific embodiment, please refer to Figure 2 As shown, a mounting component 112 is fixedly connected to the connecting surface 101. The first end of the mounting component 112 is coplanar with the short side of the isolation plate 111. The isolation plate 111 and the mounting component 112 are arranged adjacent to each other.
[0061] In one specific embodiment, please refer to Figure 1 , 2 As shown in Figures 3 and 4, the hopper assembly 10 includes: a hopper connecting plate 12, which is connected to the hopper 4; the hopper connecting plate 12 is provided with a first connecting extension 110 in the circumferential direction.
[0062] In one specific embodiment, please refer to Figure 2 As shown, the connecting component 20 includes: a first connecting compartment 210, with second connecting extensions 120 provided on both the upper and lower outer periphery; a second connecting compartment 220, with third connecting extensions 130 provided on both the upper and lower outer periphery; the first connecting extensions 110, the second connecting extensions 120, and the third connecting extensions 130 cooperate with each other to connect the first connecting compartment 210 and the second connecting compartment 220.
[0063] The first connecting bin 210 is connected to the hopper 4;
[0064] The second connecting compartment 220 is connected to the mounting component 112 and is supported by the short side of the partition plate 111.
[0065] In one specific embodiment, please refer to Figure 3 As shown, the first connecting extension 110, the second connecting extension 120, and the third connecting extension 130 are provided with corresponding threaded connecting holes 140. A locking threaded fastener 150 is connected in the threaded connecting hole 140. The threaded connecting holes 140 are staggered on the first connecting extension 110, the second connecting extension 120, and the third connecting extension 130 for installation.
[0066] In one specific embodiment, please refer to Figure 2 , 5 As shown in Figure 6, the secondary water spraying component 30 includes:
[0067] Multiple water inlet pipes 301 are inserted circumferentially from the first connecting chamber 210 and connected to a spray head 302 with the spray direction facing the compression space 2.
[0068] A spray hood 303 can be screwed onto the spray head 302; one end of multiple water inlet pipes 301 located outside the first connecting chamber 210 is connected to a water supply pipe 304; a control valve is provided on the water inlet pipe 301, and the water supply pipe is connected to a water supply pipe bus 305.
[0069] The spray hood 303 prevents blockage caused by material splashing. In the above configuration, the first connecting chamber 210 and the second connecting chamber 220 are connected in sections, which makes it easy to install the spray head 302 and the spray hood 303. It is also very convenient to maintain during disassembly.
[0070] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.
Claims
1. An extrusion pelletizing machine, comprising a machine body, the machine body including: A side shell (1) forming an extrusion space (2), wherein a rotating extrusion die wheel (3) is provided within the extrusion space (2), the rotating extrusion die wheel (3) being driven by a drive component, characterized in that it further comprises: The hopper assembly (10) is fixedly connected to the connecting surface (101) of the side shell (1) via the connecting component (20); The connecting component (20) forms an intermediate discharge bin (201), which connects the hopper (4) and the extrusion space (2). The area of the connecting component (20) in the horizontal cross section is larger than the area of the hopper (4) in the horizontal cross section; The connecting component (20) is connected to a secondary water spraying assembly (30), which is used to replenish water to the intermediate feeding hopper (201), i.e., the extrusion space (2).
2. The extrusion pelletizer as described in claim 1, characterized in that, One end of the extrusion space (2) forms a connection port, and an isolation plate (111) is provided on the inner wall of the side shell (1). The isolation plate (111) is L-shaped, and the edge of the isolation plate (111) is located at the connection port. The long side of the isolation plate (111) is attached to the inner wall of the side shell (1).
3. The extrusion pelletizer as described in claim 2, characterized in that, An installation component (112) is fixedly connected to the connecting surface (101), and the first end of the installation component (112) is coplanar with the short side of the isolation plate (111); The isolation plate (111) is arranged adjacent to the mounting component (112).
4. The extrusion pelletizer as described in claim 3, characterized in that, The hopper assembly (10) includes: A hopper connecting plate (12) is connected to the hopper (4); The hopper connecting plate (12) is provided with a first connecting extension (110) in the circumferential direction.
5. The extrusion pelletizer as described in claim 4, characterized in that, The connecting component (20) includes: The first connecting compartment (210) has a second connecting extension (120) on its upper and lower outer periphery. The second connecting compartment (220) has a third connecting extension (130) on its upper and lower outer periphery. The first connecting extension (110), the second connecting extension (120), and the third connecting extension (130) cooperate to connect the first connecting compartment (210) and the second connecting compartment (220); The first connecting chamber (210) is connected to the hopper (4). The second connecting compartment (220) is connected to the mounting component (112) and is supported by the short side of the partition plate (111).
6. The extrusion pelletizer as described in claim 5, characterized in that, The first connecting extension (110), the second connecting extension (120), and the third connecting extension (130) are provided with corresponding threaded connecting holes (140), and a locking threaded fastener (150) is connected in the threaded connecting hole (140).
7. The extrusion pelletizer as described in claim 6, characterized in that, The threaded connection hole (140) is offset on the first connection extension (110), the second connection extension (120), and the third connection extension (130).
8. The extrusion pelletizer as described in claim 5, characterized in that, The secondary water spraying component (30) includes: Multiple water inlet pipes (301) are inserted circumferentially from the first connecting chamber (210) and connected to a spray head (302) with the spray direction facing the compression space (2). A spray hood (303) can be screwed onto the spray head (302). The multiple water inlet pipes (301) are connected to a water supply pipe (304) at one end outside the first connecting chamber (210). A control valve is installed on the water inlet pipe (301), and the water supply pipe is connected to a water supply pipe bus (305).