Straw preparation biomass fuel forming die

Abstract

The utility model discloses a kind of straw preparation biomass fuel forming die, including the lower mould body being installed on base, the lower mould body top center is provided with mould cavity, the inner wall of mould cavity is sequentially provided with hardening layer and elastic stripping layer, the lower mould body is embedded with mesh heating element and temperature sensor, the lower mould body upper is provided with upper mould body, the upper mould body is installed in the lower of lifting seat, the lifting seat top is connected with hydraulic cylinder, the bottom of upper mould body is provided with pressing seat, detachably installed with wear-resistant bushing in the accommodating groove of pressing seat outer ring, the outside of wear-resistant bushing is provided with mounting hole, the bolt is screwed in the mounting hole. The utility model structure design scientific and reasonable, realizes the independent replacement of easy-wearing component, reduces maintenance cost, prolongs mould service life;While using the low adhesion characteristic of elastic stripping layer and the wear resistance characteristic of hardening layer, solve the problem that fuel is easy to adhere to mould cavity when traditional mould stripping, breakage rate is high.

Description

Technical Field

[0001] This utility model relates to the field of mold equipment technology, specifically a molding die for preparing biomass fuel from straw. Background Technology

[0002] Biomass fuel refers to fuel produced by burning biomass materials, primarily agricultural and forestry waste (such as straw, sawdust, bagasse, and rice husks). Currently, the molding dies for preparing biomass fuel from straw face the following prominent problems in practical applications: Traditional mold cavities often have metal inner walls that directly contact the raw materials, resulting in strong surface adhesion. This causes the formed biomass fuel to easily stick to the mold cavity, requiring additional external force during demolding and leading to a high fuel breakage rate, severely impacting the yield. Some molds use external heating, but the heating element distribution is unreasonable, resulting in a large temperature difference between the mold cavity perimeter and bottom. This prevents the lignin in the straw from softening evenly, leading to insufficient bonding force in the formed fuel and causing problems such as cracking and uneven density. Furthermore, because straw raw materials contain hard particles such as silica, the mold cavity inlet and pressing contact area of ​​traditional molds are subjected to long-term compression and wear, resulting in decreased mold cavity dimensional accuracy. This necessitates complete mold replacement, leading to frequent downtime maintenance and high costs. To address these issues, we propose a straw-based biomass fuel forming mold. Summary of the Invention

[0003] The purpose of this invention is to provide a molding die for preparing biomass fuel from straw, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a straw-to-biomass fuel molding die, comprising a lower die body mounted on a base, a mold cavity at the top center of the lower die body, a hardening layer on the inner wall of the mold cavity, an elastic release layer on the surface of the hardening layer, a mesh heating element and a temperature sensor embedded in the lower die body, an upper die body mounted above the lower die body, the upper die body mounted below a lifting seat, a hydraulic cylinder connected to the top of the lifting seat, a pressing seat at the bottom of the upper die body, a wear-resistant bushing detachably mounted in the clearance groove of the outer ring of the pressing seat, an installation hole on the outer side of the wear-resistant bushing, and a bolt screwed into the installation hole.

[0005] In the above scheme, a support column is provided on the top of the base, and a top plate is provided on the top of the support column. The top plate is fixedly connected to the cylinder body of the hydraulic cylinder.

[0006] In the above scheme, the mesh heating element is a resistance wire or a thermally conductive silicone sheet, and it is evenly distributed on the periphery and bottom of the mold cavity.

[0007] In the above scheme, the temperature sensor is connected to the display screen via a wire, and the display screen is electrically connected to the control switch and the power supply.

[0008] In the above scheme, the lifting seat has a through hole, and a guide rod is movably inserted into the through hole.

[0009] In the above scheme, a sealing ring is provided at the connection between the wear-resistant bushing and the pressing seat.

[0010] In the above scheme, the outer diameter of the pressing seat is the same as the inner diameter of the mold cavity, and a threaded hole is provided on the outer side of the pressing seat.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: This straw-to-biomass fuel molding die has a simple and reasonable structural design and strong practicality. The wear-resistant bushing, which can be detachably installed in the clearance groove of the outer ring of the pressing seat and fixed by bolts, allows for independent replacement of easily worn parts, reducing maintenance costs and extending the die's service life. Simultaneously, the wear-resistant bushing, made of high-hardness material and combined with the hardened layer on the inner wall of the mold cavity, solves the problem of mold cavity wear caused by hard components in the straw raw material. Utilizing the low adhesion characteristics of the elastic release layer and the wear-resistant characteristics of the hardened layer, it solves the problem of fuel easily adhering to the mold cavity and high breakage rate during demolding in traditional molds, improving demolding efficiency and reducing finished product loss. Furthermore, the mesh heating element embedded in the lower mold body is evenly distributed on the mold cavity's perimeter and bottom, and the temperature is monitored in real time by a temperature sensor, solving the problems of uneven temperature and insufficient lignin softening caused by external heating in traditional molds. This achieves precise temperature control of the mold cavity, improving the molding quality and thermal efficiency of the straw raw material. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] Figure 2 This utility model Figure 1 Schematic diagram of the structure at point A in the middle.

[0014] Figure 3 This is a schematic diagram of the electrical mechanism of this utility model.

[0015] In the diagram: 1. Base; 11. Support column; 12. Top plate; 13. Lower mold body; 14. Mold cavity; 15. Hardened layer; 16. Elastic demolding layer; 17. Mesh heating element; 18. Upper mold body; 19. Lifting seat; 2. Hydraulic cylinder; 21. Guide rod; 22. Pressing seat; 23. Relief groove; 24. Wear-resistant bushing; 25. Sealing ring; 26. Mounting hole; 27. Bolt; 28. Control switch; 29. ​​Power supply; 3. Display screen; 31. Temperature sensor. Detailed Implementation

[0016] 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.

[0017] Please see Figure 1-3 This utility model provides a technical solution: a straw-to-biomass fuel molding die, including a lower mold body 13 mounted on a base 1, a mold cavity 14 opened at the top center of the lower mold body 13, a hardening layer 15 and an elastic demolding layer 16 arranged sequentially on the inner wall of the mold cavity 14, a mesh heating element 17 and a temperature sensor 31 embedded in the lower mold body 13, an upper mold body 18 arranged above the lower mold body 13, the upper mold body 18 is mounted below a lifting seat 19, a hydraulic cylinder 2 is connected to the top of the lifting seat 19, a pressing seat 22 is arranged at the bottom of the upper mold body 18, a wear-resistant bushing 24 is detachably installed in the clearance groove 23 on the outer ring of the pressing seat 22, an installation hole 26 is opened on the outer side of the wear-resistant bushing 24, and a bolt 27 is screwed into the installation hole 26.

[0018] The hardened layer 15 (such as a nitriding or laser cladding layer) on the inner wall of the mold cavity and the elastic release layer 16 on the surface of the hardened layer 15 work together to solve the problem of wear on the mold cavity by hard particles in the straw raw material. At the same time, the low adhesion characteristics of the innermost elastic release layer are used to reduce the adhesion between the fuel and the mold cavity, improve the demolding efficiency and reduce the breakage of the finished product.

[0019] The embedded mesh heating element 17 and temperature sensor 31 enable uniform heating of the mold cavity walls and bottom, precisely control the heating temperature, ensure that the straw lignin is fully softened, and improve the bonding strength of the molded fuel.

[0020] The removable wear-resistant bushing 24 on the outer ring of the pressing seat is fixed by bolts, which solves the problem that the traditional mold needs to be replaced as a whole in the easily worn areas, and realizes local quick replacement, reducing maintenance costs.

[0021] In the above scheme, a support column 11 is provided on the top of the base 1, and a top plate 12 is provided on the top of the support column 11. The top plate 12 is fixedly connected to the cylinder body of the hydraulic cylinder 2. The support column 11 and the top plate 12 form a stable support structure, ensuring that the hydraulic cylinder 2 is installed vertically, so that the upper mold body 18 is subjected to uniform force during the pressing process, avoiding uneven compaction of raw materials caused by tilting, and ensuring the consistency of the molding fuel density.

[0022] In the above scheme, the mesh heating element 17 is a resistance wire or a thermally conductive silicone sheet, and it is evenly distributed on the periphery and bottom of the mold cavity 14. By using a resistance wire or a thermally conductive silicone sheet as the heating element, combined with a uniform distribution design, the heating efficiency of the mold cavity is significantly improved compared with traditional external heating methods, temperature gradients are eliminated, and molding defects (such as cracking and loosening) caused by local overheating or insufficient heating are reduced.

[0023] In the above scheme, the temperature sensor 31 is connected to the display screen 3 via a wire, and the display screen 3 is electrically connected to the control switch 28 and the power supply 29. The temperature sensor 31 monitors the mold cavity temperature in real time and feeds it back to the display screen 3. The operator can adjust the heating power through the control switch 28 to achieve precise control of the mold cavity temperature (e.g., adjustable from 180-220℃), avoiding unstable molding quality caused by temperature fluctuations.

[0024] In the above scheme, the lifting seat 19 has a through hole, and a guide rod 21 is movably inserted into the through hole. The guide rod 21 and the through hole of the lifting seat 19 cooperate to form a guiding mechanism, ensuring that the upper mold body 18 is vertically lifted and lowered under the drive of the hydraulic cylinder, avoiding lateral displacement during the pressing process, ensuring that the pressing seat 22 and the mold cavity 14 are coaxially aligned, and improving the uniformity of raw material compaction.

[0025] In the above scheme, a sealing ring 25 is provided at the connection between the wear-resistant bushing 24 and the pressing seat 22. The sealing ring 25 prevents straw powder or lubricant from seeping into the connection gap between the wear-resistant bushing and the pressing seat, avoiding bushing jamming or accelerated wear due to impurity accumulation, and ensuring the long-term reliability of the detachable structure.

[0026] In the above scheme, the outer diameter of the pressing seat 22 is the same as the inner diameter of the mold cavity 14, and a threaded hole is provided on the outer side of the pressing seat 22. The outer diameter of the pressing seat is consistent with the inner diameter of the mold cavity to ensure that the raw material is compacted without gaps in the mold cavity during pressing, avoiding material leakage at the edges or insufficient compaction; the threaded hole on the outer side can be used to fix the wear-resistant bushing, improving structural compatibility.

[0027] Working principle: The working process of this straw-to-biomass fuel molding die is as follows: The crushed straw raw material is poured into the feeding device, and the power supply 29 is turned on by the control switch 28. The mesh heating element 17 preheats the mold cavity to the set temperature (such as 200℃). The temperature sensor 31 monitors the temperature in real time and displays the temperature data on the display screen 3 to ensure that the mold cavity is heated evenly.

[0028] The raw material falls into the mold cavity 14 through the feed port. The hydraulic cylinder 2 drives the lifting seat 19 and the upper mold body 18 to move downward. The pressing seat 22 enters the mold cavity along with the upper mold body 18. The pressing seat 22, whose outer diameter is the same as the inner diameter of the mold cavity, applies uniform pressure to the raw material. During the pressing process, the guide rod 21 ensures that the upper mold moves vertically and avoids uneven pressure caused by tilting; the mesh heating element continuously heats the straw, softening the lignin and bonding it with the fiber to form the shape.

[0029] After holding the pressure for 10-30 seconds, the hydraulic cylinder 2 drives the upper mold body 18 to rise and reset. The elastic release layer 16 reduces the friction between the fuel and the mold cavity due to its low adhesion properties. The molded fuel quickly leaves the mold cavity under the action of gravity or the release rod.

[0030] When the wear-resistant bushing 24 shows obvious wear, the old bushing can be removed by unscrewing the bolt 27 and replaced with a new wear-resistant bushing. The replacement time is short and there is no need to stop the machine to inspect the entire mold.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A molding die for preparing biomass fuel from straw, comprising a lower mold body (13) mounted on a base (1), characterized in that: The lower mold body (13) has a mold cavity (14) at the top center. The inner wall of the mold cavity (14) is provided with a hardening layer (15). The surface of the hardening layer (15) is provided with an elastic demolding layer (16). The lower mold body (13) is embedded with a mesh heating element (17) and a temperature sensor (31). The upper mold body (18) is provided above the lower mold body (13). The upper mold body (18) is installed below the lifting seat (19). The top of the lifting seat (19) is connected to a hydraulic cylinder (2). The bottom of the upper mold body (18) is provided with a pressing seat (22). A wear-resistant bushing (24) is detachably installed in the relief groove (23) of the outer ring of the pressing seat (22). The outer side of the wear-resistant bushing (24) is provided with a mounting hole (26). A bolt (27) is screwed into the mounting hole (26).

2. The straw-to-biomass fuel molding die according to claim 1, characterized in that: The base (1) is provided with a support column (11) on top, and a top plate (12) is provided on top of the support column (11). The top plate (12) is fixedly connected to the cylinder body of the hydraulic cylinder (2).

3. The straw-to-biomass fuel molding die according to claim 1, characterized in that: The mesh heating element (17) is a resistance wire or a thermally conductive silicone sheet, and it is evenly distributed on the periphery and bottom of the mold cavity (14).

4. The straw-to-biomass fuel molding die according to claim 1, characterized in that: The temperature sensor (31) is connected to the display screen (3) via a wire, and the display screen (3) is electrically connected to the control switch (28) and the power supply (29).

5. The straw-to-biomass fuel molding die according to claim 1, characterized in that: The lifting seat (19) has a through hole, and a guide rod (21) is movably inserted into the through hole.

6. The straw-to-biomass fuel molding die according to claim 1, characterized in that: A sealing ring (25) is provided at the connection between the wear-resistant bushing (24) and the pressing seat (22).

7. The straw-to-biomass fuel molding die according to claim 1, characterized in that: The outer diameter of the pressing seat (22) is the same as the inner diameter of the mold cavity (14), and a threaded hole is provided on the outer side of the pressing seat (22).

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