Biomass briquetting device with online cleaning function

Abstract

The present application belongs to the technical field of biomass fuel production equipment, and discloses a biomass briquetting fuel forming device with an online cleaning function. The forming device comprises a rack, a forming die, a compression roller set and a cleaning device. The forming die is rotatably installed on the rack, and a plurality of die holes are formed in the forming die. The compression roller set comprises a plurality of compression rollers, and each compression roller is arranged along the circumferential direction of the forming die. The compression roller set leaves a vacant position in the circumferential direction of the forming die, and the cleaning device is fixedly installed on the rack and located at the vacant position. The rotating direction of the forming die is opposite to the rotating direction of the compression rollers. When the forming die rotates, the die holes pass through the extrusion area of the compression rollers in sequence to complete forming, and then pass through the cleaning device at the vacant position for online cleaning. The cleaning device can be a gas explosion cleaning device or a mechanical cleaning device. The present application completes the online cleaning of the die holes during the rotation of the forming die, without the need to stop the machine, and has a simple structure and flexible and selectable cleaning mode.

Description

Technical Field

[0001] This invention relates to the field of biomass briquetting technology, specifically to a biomass briquetting device with online cleaning function. Background Technology

[0002] Biomass briquetted fuel is a solid fuel made from biomass raw materials such as crop straw, sawdust, and fruit shells through processes such as drying, crushing, and pressing. It has advantages such as being renewable and having low carbon emissions. The biomass briquetted fuel forming device is the core equipment of the biomass fuel production line. Its function is to extrude the crushed and mixed biomass raw materials under high pressure into high-density pellets or rod-shaped fuel. The forming device typically includes pressure rollers and forming molds. The forming molds have multiple die holes. The pressure rollers crush the raw materials and force them into the die holes. After being compressed and formed within the die holes, the raw materials are extruded from the die hole outlet and cut into pellet-shaped fuel by a cutter.

[0003] During the operation of molding equipment, die clogging is a prominent problem affecting production efficiency and equipment lifespan. Raw material powder easily clumps and remains on the inner wall of the die during high-pressure extrusion, gradually reducing the effective diameter of the die until it becomes completely blocked, causing frequent equipment shutdowns for cleaning. Existing technologies already offer some solutions to the die clogging problem. For example, patent CN121946923A discloses a molding device for biomass fuel processing, which achieves die cleaning through a unidirectional transmission design of a motor rotating in both forward and reverse directions, using an elastic pawl and a ratchet disc: when the motor rotates forward, the elastic pawl and ratchet disc slip, driving only the pressure roller and cutter to complete the molding operation; when cleaning the die is required, the motor is switched to rotate in reverse, the elastic pawl engages with the ratchet disc, and the end face cam rotates to trigger the cleaning process. The solution has the following drawbacks: it involves multiple mechanical transmission components such as end face cam, ratchet disk, and elastic pawl, which require high manufacturing precision. After long-term operation, mechanical wear will increase the risk of transmission failure; the motor direction needs to be switched when cleaning the mold hole, and the molding operation is interrupted during the cleaning process; the entire mold hole is cleaned uniformly, which makes it impossible to clean a single blocked mold hole accurately, resulting in low cleaning efficiency and high energy consumption.

[0004] To address the above problems, the present invention provides a biomass compression fuel molding device with online cleaning function. Summary of the Invention

[0005] The purpose of this invention is to provide a biomass briquetting fuel forming device with online cleaning function, which aims to solve the technical problems of existing die hole cleaning solutions, such as complex structure, need for machine shutdown operation, and inability to clean individual die holes independently and accurately.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: The technical solution adopted by the present invention to solve its technical problem is: a biomass briquetting fuel molding device with online cleaning function, characterized in that it includes: a frame, a molding die, a pressure roller group, a cleaning device and a controller.

[0007] The forming mold is a ring-shaped or disc-shaped structure, rotatably mounted on the frame. Multiple mold holes are formed on the forming mold, evenly distributed along its circumference. The forming mold is driven by a drive motor to rotate uniformly around its axis.

[0008] The pressure roller assembly includes multiple pressure rollers, each arranged along the circumference of the forming mold on its working surface. A pressing gap is formed between each pressure roller and the working surface of the forming mold, used to press the raw material into the mold cavity for forming.

[0009] The pressure rollers in the pressure roller group are not evenly distributed along the circumference of the forming mold, but rather leave a gap. No pressure roller is placed at this gap.

[0010] The cleaning device is fixedly installed on the frame at the vacant position. The working end of the cleaning device faces the discharge end of the die hole.

[0011] The rotation direction of the forming mold is opposite to that of each pressure roller. When the forming mold rotates, each die hole passes through the extrusion area of ​​each pressure roller in sequence to complete the forming process, and then passes through the working range of the cleaning device at the empty position for cleaning.

[0012] The controller is electrically connected to the cleaning device and is used to control the cleaning device to clean the mold holes currently within its working range at a preset frequency.

[0013] Preferably, the cleaning device is a gas explosion cleaning device, comprising: an external air source, a high-pressure nozzle, a gas distribution pipeline, and a solenoid valve. The high-pressure nozzle is fixedly installed on the frame at an empty position, with its outlet facing the discharge end of the die hole, and its inlet connected to the external air source. The gas distribution pipeline connects the outlet of the external air source to the high-pressure nozzle. The solenoid valve is located on the gas distribution pipeline and is electrically connected to the controller.

[0014] Preferably, the high-pressure nozzle is a tapered nozzle, and the cross-sectional area of ​​its internal flow channel gradually decreases from the inlet end to the outlet end.

[0015] Preferably, there are M high-pressure air nozzles arranged from top to bottom, where M is equal to the number of rows of the die holes, and the axis of each high-pressure air nozzle coincides with the axis of its corresponding die hole.

[0016] Preferably, the cleaning device is a mechanical cleaning device, comprising: a drive mechanism and a cleaning probe, wherein the cleaning probe is fixedly installed on the frame at a vacant position; the cleaning probe is fixedly installed at the output end of the drive mechanism, the drive mechanism having a telescopic mechanism, allowing the cleaning probe to extend into the mold hole and retract, the axis of the cleaning probe coinciding with the axis of the mold hole; the diameter of the cleaning probe is smaller than the diameter of the mold hole.

[0017] Preferably, the cleaning probes are M in number, arranged from top to bottom, where M is equal to the number of rows of the mold holes, and the axis of each cleaning probe coincides with the axis of its corresponding mold hole.

[0018] Compared with the prior art, the beneficial effects of the present invention are: 1. Online cleaning, no machine downtime required. The cleaning device is located in an empty position in the pressure roller layout. During the rotation of the forming die, it is sequentially squeezed by the pressure rollers and cleaned by the cleaning device. The cleaning process is carried out simultaneously with the forming process, and the entire machine does not need to be stopped, ensuring continuous production. Each die hole is cleaned regularly at a preset frequency, removing the deposits on the inner wall of the die hole before clogging occurs, achieving preventive maintenance and fundamentally avoiding die hole clogging.

[0019] 2. Unobstructed cleaning for thorough results. No pressure rollers are installed at the location of the cleaning device, ensuring the die holes are not obstructed during cleaning. The working medium (high-pressure gas or probe) of the cleaning device can directly act on the inside of the die holes, resulting in a thorough cleaning effect.

[0020] 3. Improve molding efficiency. The presence of gaps in the pressure roller layout does not affect molding efficiency—on the contrary, by rationally setting the number of pressure rollers and the angle of the gaps, molding and cleaning can be performed concurrently while ensuring sufficient extrusion molding area. Simultaneously, the design of the pressure rollers rotating in opposite directions to the die increases the relative speed, further improving extrusion molding efficiency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the biomass compression molding fuel forming device of the present invention; Figure 2 This is a top view schematic diagram of the layout and gap positions of the pressure rollers of the present invention; Figure 3 This is a schematic diagram of the gas explosion cleaning device of the present invention; Figure 4 This is a schematic diagram of the mechanical cleaning device of the present invention.

[0022] In the diagram: 1. Frame, 2. Molding mold, 3. Pressure roller assembly, 4. Cleaning device, 5. Controller, 21. Mold hole, 31. Pressure roller, 32. Empty position, 41. External air source, 42. High-pressure air nozzle, 43. Gas distribution pipeline, 44. Solenoid valve, 45. Drive mechanism, 46. Cleaning probe. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Example 1 Please see Figure 1-3 The present invention provides a technical solution: a biomass briquetting fuel forming device with online cleaning function, characterized in that it includes: a frame 1, a forming mold 2, a pressure roller group 3 and a cleaning device 4.

[0025] The molding die 2 is a ring-shaped structure and is rotatably mounted on the frame 1. Multiple die holes 21 are provided on the molding die 2, and these holes 21 are evenly distributed along the circumference of the molding die 2. The molding die 2 is driven by a drive motor to rotate uniformly around its axis.

[0026] The pressure roller assembly 3 includes multiple pressure rollers 31, each of which is arranged inside the annular mold along the circumferential direction of the forming mold 2. An extrusion gap is formed between each pressure roller 31 and the inner working surface of the forming mold 2. The pressure rollers 31 are not evenly distributed in the circumferential direction; instead, there is a gap 32 where no pressure roller is installed.

[0027] The cleaning device 4 is fixedly installed on the frame 1 at the empty position 32.

[0028] In this embodiment, the cleaning device 4 is an air-explosion cleaning device, including an external air source 41, a high-pressure nozzle 42, a gas distribution pipeline 43, a solenoid valve 44, and a controller 5. The high-pressure nozzle 42 is fixedly installed on the frame 1, located at the empty position 32, with the outlet of the nozzle 42 facing the discharge end of the die hole 21. The high-pressure nozzle 42 is a tapered nozzle, with M nozzles arranged sequentially from top to bottom, M being equal to the number of rows of die holes 21, and the axis of each high-pressure nozzle 42 coincides with the axis of its corresponding die hole 21. The gas distribution pipeline 43 connects the outlet of the external air source 41 to the high-pressure nozzle 42. The solenoid valve 44 is installed on the gas distribution pipeline 43 and electrically connected to the controller 5.

[0029] The rotation direction of the molding die 2 is opposite to the rotation direction of each pressure roller 31. The controller 5 has a preset cleaning frequency, which is one cleaning cycle per die hole spacing or one cleaning cycle every N die hole spacings, where N is a positive integer from 2 to 10. The cleaning frequency can be set according to the working conditions. The controller 5 may also be equipped with a timer. When the rotation speed of the molding die 2 changes, the timer automatically adjusts the cleaning trigger time to ensure that the cleaning device 4 starts when the die hole 21 is within its working range.

[0030] During equipment operation, the drive motor drives the forming mold 2 to rotate at a constant speed. Each mold hole 21 passes through the extrusion area of ​​each pressure roller 31 in sequence. The pressure roller 31 and the forming mold 2 rotate relative to each other, pressing the raw material into the mold hole 21 to complete the forming. Since the forming mold 2 and the pressure roller 31 rotate in opposite directions, the relative speed increases, and the extrusion efficiency is improved. After forming, the mold hole 21 continues to rotate with the forming mold 2 to the empty position 32. At this time, the mold hole 21 has left the extrusion area of ​​the pressure roller 31 and is no longer blocked by the pressure roller. The controller 5 controls the solenoid valve 44 to open, and the high-pressure gas in the gas storage tank 41 is ejected through the high-pressure air nozzle 42. The high-speed airflow blows into the mold hole 21, blowing away the deposits on the inner wall of the mold hole 21. The high-pressure air nozzle 42 can be set as a tapered nozzle, and the cross-sectional area of ​​its internal flow channel gradually decreases from the air inlet end to the air outlet end. When the gas flows in the nozzle, the gas velocity can be further increased, thereby increasing the cleaning efficiency. After cleaning, the die hole 21 continues to rotate with the forming die 2 and re-enters the extrusion area of ​​the pressure roller 31 to perform the forming operation again. The whole machine does not need to be stopped during the entire process.

[0031] Example 2 Please see Figure 1-4 The difference between this embodiment and Embodiment 1 is that the cleaning device 4 is a mechanical cleaning device, including a drive mechanism 45, a cleaning probe 46, and a controller 5. The drive mechanism 45 is an electric push rod, fixedly installed on the frame 1, located at the empty position 32. The cleaning probe 46 is fixedly installed at the output end of the drive mechanism 45. The drive mechanism 45 has a telescopic mechanism, allowing the cleaning probe 46 to extend into the mold hole 21 and retract. There are M cleaning probes 46, arranged sequentially from top to bottom, with M equal to the number of rows of mold holes 21. The axis of each cleaning probe 46 coincides with the axis of its corresponding mold hole 21, and the diameter of the cleaning probe 46 is 70%-90% of the diameter of the mold hole 21.

[0032] During equipment operation, the molded hole 21, after molding, rotates with the molding die 2 to the empty position 32. The controller 5 controls the drive mechanism 45 to drive the cleaning probe 46 to extend into the molded hole 21, pushing away the deposits on the inner wall of the molded hole 21. Then, the drive mechanism 45 drives the cleaning probe 46 to exit the molded hole 21. After cleaning, the molded hole 21 resumes feeding and molding operations.

Claims

1. A biomass briquetting fuel forming device with online cleaning function, comprising a frame (1), a forming mold (2), a pressure roller group (3), and a cleaning device (4), characterized in that: The forming mold (2) is a ring structure or a disc structure, and is rotatably mounted on the frame (1). The forming mold (2) has multiple mold holes (21). The pressure roller group (3) includes multiple pressure rollers (31), each pressure roller (31) is arranged on the working surface of the forming mold (2) along the circumferential direction of the forming mold (2), and an extrusion gap is formed between each pressure roller (31) and the mold hole (21) of the forming mold (2); Each pressure roller (31) in the pressure roller group (3) has a gap (32) in the circumferential direction of the forming mold (2), and no pressure roller is set at the gap (32); The cleaning device (4) is fixedly installed on the frame (1) and located outside the mold hole (21) corresponding to the vacant position (32). The working end of the cleaning device (4) faces the discharge end of the mold hole (21). The rotation direction of the forming mold (2) is opposite to the rotation direction of each pressure roller (31); It also includes a controller (5), which is electrically connected to the cleaning device (4) and is used to control the cleaning device (4) to clean the mold hole (21) currently located within its working range at a preset frequency.

2. The biomass compression fuel forming device according to claim 1, characterized in that, The cleaning device (4) is a gas explosion cleaning device, comprising: External air source (41); The high-pressure air nozzle (42) is fixedly installed on the frame (1) at the empty position (32). The outlet of the high-pressure air nozzle (42) faces the discharge end of the die hole (21), and its air inlet is connected to an external air source. Gas distribution pipeline (43) connects the outlet of external gas source (41) to high-pressure gas nozzle (42); The solenoid valve (44) is installed on the gas distribution pipeline (43) and is electrically connected to the controller (5).

3. The biomass compression molding fuel forming device according to claim 2, characterized in that, The high-pressure nozzle (42) is a tapered nozzle, and the cross-sectional area of ​​its internal flow channel gradually decreases from the inlet end to the outlet end.

4. The biomass compression molding fuel forming device according to claim 3, characterized in that, The high-pressure air nozzle (42) has M units, arranged from top to bottom, with M equal to the number of rows of the die hole (21), and the axis of each high-pressure air nozzle (42) coincides with the axis of its corresponding die hole (21).

5. The biomass compression fuel forming device according to claim 1, characterized in that, The cleaning device (4) is a mechanical cleaning device, comprising: The drive mechanism (45) is fixedly installed on the frame (1) and located at the empty position (32); A cleaning probe (46) is fixedly installed at the output end of a drive mechanism (45). The drive mechanism (45) has a telescopic mechanism, which allows the cleaning probe (46) to extend into the mold hole (21) and retract. The axis of the cleaning probe (46) coincides with the axis of the mold hole (21). The diameter of the cleaning probe (46) is smaller than the diameter of the mold hole (21).

6. The biomass compression fuel forming apparatus according to claim 5, characterized in that, The cleaning probes (46) are M in number, arranged from top to bottom, with M equal to the number of rows of the mold holes (21), and the axis of each cleaning probe (46) coincides with the axis of its corresponding mold hole (21).

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