Vertical circular mold granulator for biomass particle production

Abstract

The invention relates to the technical field of circular mold granulation machines, in particular to a vertical circular mold granulation machine for biomass particle production, which comprises a mounting table for vertically mounting a circular mold, a bracket and a material blocking cover arranged on the mounting table, a barrel mounted on the bracket, and a mounting cavity formed in the barrel, the conveying belt is used for conveying biomass particle raw materials, the humidity adjusting assembly is arranged on the support and in the mounting cavity, the double-curved-surface pressing roller sets are symmetrically arranged in the mounting cavity and work in cooperation with the circular mold, and the pelletizing mechanism is arranged at the bottom of the barrel. According to the circular mold granulator, the modular design is adopted, compared with a traditional horizontal circular mold granulator which usually needs to disassemble the whole granulator during circular mold replacement operation, the circular mold granulator is lower in process difficulty in the circular mold replacement operation, operation of professionals is not needed, the disassembly and assembly operation of the circular mold can be achieved only by rotating the circular mold, and the production efficiency is improved. And the maintenance cost of the circular mold granulator can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of ring die pellet machines, and in particular to a vertical ring die pellet machine for producing biomass pellets. Background Art

[0002] Ring die pellet machine is a feed pelletizing equipment. It is a feed processing machine that directly presses pellets from crushed materials such as corn, soybean meal, straw, grass, rice husk, etc.

[0003] The traditional horizontal ring die pellet machine has the following problems in actual use: First, the feed port of the horizontal ring die pellet machine is usually located above the ring die. The material is easily accumulated at the bottom of the ring die under the action of gravity, resulting in insufficient material in the upper part of the ring die and excessive material in the lower part, which in turn causes uneven force on the ring die and aggravated local wear. In addition, the ring die and pressure roller of the horizontal ring die pellet machine are subjected to large radial force and friction during operation, resulting in rapid wear. If the ring die cannot be used any more, the staff needs to disassemble the ring die biomass pellet machine first, and then replace the ring die. Finally, the ring die biomass pellet machine is assembled. The staff needs to be equipped with professional tools for disassembly and assembly operations, which increases the complexity of the process and the fatigue of the staff.

[0004] Second, the horizontal ring die pellet machine has high requirements on the humidity characteristics of the material and poor adaptability, which leads to the need for pre-treatment of the material in advance, resulting in high cost of material pre-treatment and difficulty in processing diversified raw materials. Summary of the invention

[0005] The purpose of the present invention is to solve the problems that the structural design of the horizontal ring die pellet machine in the prior art leads to complicated replacement and maintenance of the ring die and the pressure roller, long maintenance time, and requires professional technicians to operate, high material pretreatment cost, and difficulty in processing diversified raw materials, and a vertical ring die pellet machine for biomass pellet production is proposed.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A vertical ring die pellet machine for producing biomass pellets, comprising: Mounting table for vertical mounting of ring dies; A bracket and a material blocking cover arranged on the mounting platform; A cylinder mounted on the bracket; A mounting cavity is provided on the cylinder; A conveyor belt for conveying raw materials of biomass particles, wherein an output end of the conveyor belt is arranged correspondingly to an upper end of the installation cavity; A humidity regulating component disposed on the bracket and in the mounting cavity; A hyperbolic roller set symmetrically arranged in the installation cavity and cooperating with the ring die; A granulation mechanism arranged at the bottom of the cylinder body, and the granulation mechanism is used to cooperate with the ring die and the hyperbolic roller set to produce biomass particles.

[0007] Preferably, the surface of the ring die has a tungsten carbide coating. The installation table is composed of a rectangular platform and multiple support rods. An installation round hole for sliding and sleeving the ring die is provided on the installation table. Two limiting rods are fixedly connected to the bottom end of the ring die. A limiting port and a limiting cavity that communicate up and down are provided on the installation table. The geometric shape of the inner wall of the limiting port is completely matched with the outer hub of the limiting rod. The internal space of the limiting cavity is accurately divided into two independent regions with equal volumes. The geometric shape of each independent region is completely matched with the outer hub of the limiting rod. One of the independent regions is arranged corresponding to the limiting port up and down, and a magnetic sheet for magnetically fixing the limiting rod is arranged on one side of the other independent region away from the limiting port.

[0008] Preferably, the material blocking cover is an annular structure with a notch on one side, and an inclined downward material guiding groove is provided at the corresponding position of the installation table and the notch of the material blocking cover.

[0009] Preferably, the cavity of the installation cavity is successively a first frustum-shaped cavity, a drum-shaped cavity, a second frustum-shaped cavity and a cylindrical cavity from top to bottom. The first frustum-shaped cavity, the drum-shaped cavity, the second frustum-shaped cavity and the cylindrical cavity are seamlessly connected in the vertical direction and form a composite space structure. The smaller-diameter ends of one of the frustum-shaped cavities of the installation cavity are arranged in the same direction as the smaller-diameter ends of the other frustum-shaped cavity of the installation cavity.

[0010] Preferably, the humidity adjustment component includes: A capacitive sensor installed on the bracket, the probe of the capacitive sensor is embedded in the powder on the conveyor belt, and a self-cleaning sensor for preventing powder adhesion to the probe by ultrasonic vibration is provided on the capacitive sensor; Multiple groups of heating wires installed on the curved end surface of the drum-shaped cavity, and the capacitive sensor is electrically connected to the heating wires.

[0011] Preferably, the hyperbolic roller set is composed of multiple rollers, a frequency conversion drive system and an installation frame.

[0012] Preferably, the roller has a hyperbolic geometric structure, the curvature radius of the roller surface is 50 - 100 mm, and the gap between the hyperbolic roller set and the ring die is 0.1 - 0.3 mm.

[0013] Preferably, the variable-frequency drive system is used to adjust the pressure and rotation speed of the pressure roller. The variable-frequency drive system consists of a motor box with a built-in variable-frequency motor, a hydraulic device, a drive bracket, a drive rod, and an intelligent control module. The drive brackets are arranged on both the upper and lower sides of the pressure roller. The drive rod is fixed at the center position of the drive bracket. A positioning sleeve for slidably sleeving the lower end of the drive rod is arranged at the center position of the inner bottom end of the ring die. The variable-frequency motor adjusts the rotation speed of the pressure roller in real time through the drive rod and the drive bracket. The hydraulic device is used to adjust the pressure of the pressure roller in real time. The intelligent control module is used to feedback compression parameters in real time and automatically optimize compression parameters. The top end of the motor box is of a pyramidal structure. The mounting frame is composed of four mounting rods. The longitudinal section of the mounting rod is of a triangular structure, and the mounting rod is fixedly connected to the motor box.

[0014] Preferably, the pelletizing mechanism includes: A driving gear ring rotatably mounted on the mounting table, and tooth teeth are arranged on the outer wall of the lower end of the driving gear ring; A plurality of pelletizing knives arranged on the upper surface of the driving gear ring; A driving member mounted on the mounting table and used to drive the driving gear ring to rotate.

[0015] Preferably, the driving member consists of a motor bracket, a motor, and a gear. The motor bracket is fixedly connected to the mounting table. The motor is mounted on the motor bracket. The gear is mounted on the output end of the motor, and the gear is meshed with the driving gear ring.

[0016] Compared with the prior art, the present invention has the following advantages: 1. The ring die pellet mill in the present invention adopts a modular design. Compared with the traditional horizontal ring die pellet mill, which usually requires the disassembly of the whole machine during the ring die replacement operation, this ring die pellet mill has a higher replacement efficiency and lower process difficulty during the ring die replacement operation. It does not require professional operation and only needs to rotate the ring die to achieve the disassembly and assembly operation of the ring die, which helps to reduce the maintenance cost of the ring die pellet mill.

[0017] 2. The ring die pellet mill in the present invention adopts a vertical layout, which makes the movement track of the biomass pellet raw material tend to be stable after entering the ring die pellet mill, helps to ensure the uniformity of the gravity distribution of the biomass pellet raw material, and the transmission system of this ring die pellet mill is simpler than that of the traditional ring die pellet mill, thereby reducing the equipment volume and energy consumption.

[0018] 3. In the present invention, the humidity adjustment component senses the humidity of the biomass pellet raw material, and judges whether to start the heating wire according to the humidity of the biomass pellet raw material, and dries it through the heating wire, so as to ensure that the humidity of the biomass pellet raw material is qualified, which helps to improve the adaptability of the ring die pellet mill to different biomass pellet raw materials. Description of the Drawings

[0019] Figure 1 Schematic diagram of the overall structure proposed by the present invention; Figure 2 Schematic diagram of the structure from another perspective proposed by the present invention; Figure 3 Proposed by the present invention Figure 1 Side sectional view in; Figure 4 Schematic diagram of the pelletizing mechanism structure proposed by the present invention; Figure 5 Upper sectional view of the mounting table proposed by the present invention; Figure 6 Schematic diagram of the connection structure between the ring die and the limiting rod proposed by the present invention.

[0020] In the figure: 1. Ring die; 101. Limiting rod; 2. Mounting table; 201. Limiting port; 202. Limiting cavity; 203. Feeding chute; 3. Bracket; 4. Material blocking cover; 5. Cylinder; 6. Installation cavity; 7. Conveyor belt; 8. Humidity adjustment component; 801. Capacitive sensor; 802. Heating wire; 9. Hyperbolic roll group; 901. Roll; 902. Variable frequency drive system; 903. Mounting frame; 10. Pelletizing mechanism; 1001. Driving gear ring; 1002. Pelletizing knife; 1003. Driving part. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0022] The present invention provides the following preferred embodiments: Embodiment 1 Refer to Figures 1 to 6 As shown, this embodiment provides a vertical ring die pellet mill for biomass pellet production. The biomass pellet raw material is wood chip pellets, the moisture content of the biomass pellet raw material is 12%, and the temperature is 80 °C; It includes a ring die 1, a limiting rod 101, a mounting table 2, a limiting port 201, a limiting cavity 202, a feeding chute 203, a bracket 3, a material blocking cover 4, a cylinder 5, an installation cavity 6, a conveyor belt 7, a hyperbolic roll group 9 and a pelletizing mechanism 10. The components are arranged as follows: The mounting table 2 is used for vertically mounting the ring die 1. The ring die 1 has a pore diameter of 8 mm and a tungsten carbide coating on its surface. It should be noted that the tungsten carbide coating has the advantages of good thermal stability, good wear resistance, excellent impact resistance, and good workability, which helps to improve the service life of the ring die 1. The mounting table 2 consists of a rectangular platform and multiple support rods. An installation round hole for slidably sleeving the ring die 1 is provided on the mounting table 2, providing a disassembly and assembly space for the ring die 1.

[0023] Two limiting rods 101 are fixedly connected to the bottom end of the ring die 1. A limiting port 201 and a limiting cavity 202 that communicate up and down are provided on the mounting table 2. The geometric shape of the inner wall of the limiting port 201 completely matches the geometric shape of the outer hub of the limiting rod 101. The internal space of the limiting cavity 202 is precisely divided into two independent regions of equal volume, and the geometric shape of each independent region completely matches the geometric shape of the outer hub of the limiting rod 101. One of the independent regions is arranged corresponding to the limiting port 201 up and down, and a magnetic sheet for magnetically fixing the limiting rod 101 is arranged on one side of the other independent region away from the limiting port 201. It should be noted that the material of the limiting rod 101 is iron. The magnetic fixation between the limiting rod 101 and the magnetic sheet ensures the stability of the ring die 1 during operation, and enables the staff to disassemble the ring die 1 alone, and the disassembly and assembly operation of the ring die 1 can be realized without professional tools and professional personnel, which helps to reduce the process difficulty and maintenance cost; The bracket 3 and the material baffle cover 4 are arranged on the mounting table 2. The material baffle cover 4 is a circular ring structure with a notch on one side. An inclined downward material guiding groove 203 is provided at the corresponding position of the mounting table 2 and the notch of the material baffle cover 4, so that the biomass particles are discharged through the material guiding groove 203 under the action of gravity; The cylinder body 5 is installed on the bracket 3. An installation cavity 6 is provided on the cylinder body 5. The cavity of the installation cavity 6 is successively a first frustum-shaped cavity, a drum-shaped cavity, a second frustum-shaped cavity, and a cylindrical cavity from top to bottom. The first frustum-shaped cavity, the drum-shaped cavity, the second frustum-shaped cavity, and the cylindrical cavity are seamlessly connected in the vertical direction and form a composite space structure. One end with a smaller diameter of one of the frustum-shaped cavities of the installation cavity 6 is arranged in the same direction as one end with a smaller diameter of the other frustum-shaped cavity of the installation cavity 6; The conveyor belt 7 is used for transporting the biomass particle raw materials. The output end of the conveyor belt 7 is arranged corresponding to the upper end of the installation cavity 6 up and down, so that the biomass particle raw materials directly fall vertically into the cylinder body 5 under the action of gravity. The hyperbolic roller group 9 is symmetrically arranged in the installation cavity 6 and cooperates with the ring die 1. The hyperbolic roller group 9 consists of multiple rollers 901, a variable frequency drive system 902, and a mounting frame 903.

[0024] The pressure roller 901 has a hyperboloid geometric structure, with a pressure of 12 MPa on the pressure roller 901. The radius of curvature of the curved surface of the pressure roller 901 is 50 - 100 mm. The gap between the hyperboloid pressure roller group 9 and the ring die 1 is 0.1 - 0.3 mm. It should be noted that: the surface of the pressure roller 901 is designed as a hyperboloid, and its radius of curvature forms a conjugate surface with the inner wall curvature of the ring die, ensuring that the contact line is continuous and the pressure distribution is uniform. The curvature along the axis of the pressure roller 901 matches the circumferential curvature of the ring die 1, reducing the edge stress concentration. The radial curvature of the pressure roller 901 is complementary to the inner wall curvature of the ring die 1, forming a dynamic meshing surface. The contact mode between the pressure roller 901 and the biomass particle raw material is surface contact, thereby reducing the area pressure of the pressure roller 901 and further reducing local wear. Moreover, the curvature change of the hyperboloid of the pressure roller 901 forms a progressive pressure gradient. The curvature of the feeding end of the pressure roller 901 is gentle and the pressure is low, realizing the pre-compression of the material. The curvature of the discharging end of the pressure roller 901 is steep and the pressure suddenly increases, ensuring the dense molding of the particles.

[0025] The variable-frequency drive system 902 is used to adjust the pressure and speed of the pressure roller 901. The variable-frequency drive system 902 consists of a motor box with an internal variable-frequency motor, a hydraulic device, a drive bracket, a drive rod, and an intelligent control module. The drive brackets are arranged on the upper and lower sides of the pressure roller 901, thereby preventing the lower end of the pressure roller 901 from directly contacting the inner bottom end of the ring die 1, which helps to reduce the wear of the lower end of the pressure roller 901. The drive rod is fixed at the center position of the drive bracket. A positioning sleeve for slidably sleeving the lower end of the drive rod is arranged at the center position of the inner bottom end of the ring die 1. The variable-frequency motor adjusts the speed of the pressure roller 901 in real time through the drive rod and the drive bracket. The hydraulic device is used to adjust the pressure of the pressure roller 901 in real time. The compression ratio of the hydraulic device is 1:6. The position of the pressure roller 901 is adjusted in real time through the hydraulic device to compensate for the wear and deformation of the ring die 1 and the pressure roller 901, and automatically reduce the distance between the two after the pressure roller 1 is worn. The intelligent control module is used to feedback the compression parameters in real time and automatically optimize the compression parameters. The intelligent control module dynamically adjusts the pressure of the pressure roller 901 through the PID algorithm. The top of the motor box is a pyramidal structure. The mounting frame 903 is composed of four mounting rods. The longitudinal section of the mounting rod is a triangular structure, thereby preventing the biomass particle raw material from adhering to the motor box and the mounting rods, and the mounting rods are fixedly connected to the motor box, thereby preventing the variable-frequency drive system 902 from being suspended.

[0026] The granulation mechanism 10 is arranged at the bottom of the cylinder body 5. The granulation mechanism 10 is used to cooperate with the ring die 1 and the hyperboloid pressure roller group 9 to produce biomass particles. The granulation mechanism 10 includes a driving gear ring 1001, a granulation knife 1002, and a driving part 1003. The settings of each component are as follows: The driving gear ring 1001 is rotatably installed on the mounting table 2. The outer wall of the lower end of the driving gear ring 1001 is provided with teeth. A plurality of pelletizing knives 1002 are arranged on the upper surface of the driving gear ring 1001. The driving member 1003 is installed on the mounting table 2 and is used to drive the driving gear ring 1001 to rotate. The driving member 1003 is composed of a motor bracket, a motor and a gear. The motor bracket is fixedly connected to the mounting table 2. The motor is installed on the motor bracket. The gear is installed on the output end of the motor, and the gear is meshed with the driving gear ring 1001. The driving member 1003 drives the driving gear ring 1001 to rotate through the gear, thereby driving the pelletizing knives 1002 to perform circular motion. And the bottom end of the mounting table 2 located inside the pelletizing knives 1002 is connected with a support rod. The friction force between the support rod and the ground and the self-weight of the ring die granulator prevent the inner ring of the mounting table 2 from being affected by the rotation of the pelletizing knives 1002, thereby ensuring the normal operation of the ring die granulator.

[0027] When using the ring die granulator in the above implementation method, operate according to the following steps: Step S1: Align the limiting rod 101 with the limiting port 201 and push it upward so that the limiting rod 101 enters the limiting cavity 202. Then rotate the ring die 1 so that the limiting rod 101 is in movable contact with the magnetic sheet, and use the magnetic sheet to magnetically fix the limiting rod 101, thereby completing the installation operation of the ring die 1. At this time, the driving rod enters the positioning sleeve. Step S2: The biomass pellet raw material enters the upper end of the installation cavity 6 through the conveyor belt 7. The biomass pellet raw material enters the lower end of the installation cavity 6, and uses the geometric characteristics of the hyperboloid of the pressure roller 901 to generate a centrifugal slip effect when the pressure roller 901 rotates, and pushes the biomass pellet raw material to flow out of the holes on the ring die 1. Meanwhile, start the driving member 1003 to drive the driving gear ring 1001 to rotate. The driving gear ring 1001 drives the pelletizing knives 1002 to rotate, thereby cutting off the biomass pellet raw material extruded from the holes on the ring die 1 and discharging it under the guidance of the material guiding groove 203. Step S3: When the ring die 1 is damaged and needs to be disassembled and replaced, place a cotton pad for buffering in advance at the bottom of the ring die 1. Take a cylinder matching the geometric structure of the holes on the ring die 1 and insert it into one of the holes opened on the ring die 1. Then rotate the ring die 1 through the cylinder so that the limiting rod 101 is separated from the attraction of the magnetic sheet. After the ring die 1 rotates, pull out the cylinder, and then the staff manually rotates the ring die 1. It should be noted that: the staff needs to wear corresponding protective gloves. The ring die 1 drives the limiting rod 101 to rotate. When the limiting rod 101 corresponds to the limiting port 201 up and down, it slides downward under the influence of gravity. At this time, the staff feels the downward acting force and stays away from the ring die granulator. The ring die 1 contacts the cotton pad, thereby avoiding damage to the ring die 1 and the equipment placement area. The staff repeats step S1 to complete the installation operation of the ring die 1.

[0028] Example 2 Reference Figure 1 As shown in Figure 3 Based on the first implementation method, this implementation method further refines the ring die pellet mill and introduces a humidity adjustment component 8 to detect the humidity of the biomass pellet raw material and determine whether the humidity meets the processing requirements. The specific implementation method is as follows: The humidity adjustment component 8 is arranged on the bracket 3 and in the installation cavity 6. The following are multiple implementation methods of the humidity adjustment component 8 for selection: Multiple groups of heating wires 802 are installed on the curved surface of the drum-shaped cavity to dry when the humidity is too high, so as to ensure that the humidity of the biomass pellet raw material is qualified. Through the curved surface design, the biomass pellet raw material will not adhere to the heating wires 802 during the vertical falling process; Detection method based on electrical characteristics: The capacitive induction method is adopted. The specific principle is to utilize the characteristic that the dielectric constant of the powder changes with humidity, and calculate the humidity through the change of the capacitance value; Implementation method: Embed the sensor probe into the powder and measure the capacitance change through high-frequency signals to reduce the conductive interference.

[0029] Detection based on microwave or radio frequency: The microwave transmission method is adopted. The specific principle is that when the microwave passes through the powder, its attenuation and phase change are related to the humidity; Implementation method: Install a microwave transmitter and a receiver on both sides of the conveyor belt 7, and analyze the signal attenuation rate to calculate the humidity.

[0030] Optical detection technology: Near-infrared spectroscopy is adopted. The specific principle is that water molecules have characteristic absorption peaks in the near-infrared band, and the humidity is calculated through the absorbance; Implementation method: Install an NIR probe on the conveyor belt 7 to scan the powder surface in real time, and establish a humidity prediction model in combination with the chemometrics model.

[0031] Thermodynamic method: The rapid drying method is adopted. The specific principle: By heating the powder and monitoring the mass loss in real time, the initial humidity is deduced; Implementation method: Use infrared heating or microwave drying to shorten the time, and integrate a weighing sensor and a temperature control system to achieve automation.

[0032] The detection time of the capacitive induction method is in milliseconds, the detection accuracy is ±1%RH, and the economic cost is low; The detection time of the microwave transmission method is in seconds, the detection accuracy is ±0.5%RH, and the economic cost is high; The detection time of the near-infrared spectroscopy is in seconds, the detection accuracy is ±0.3%RH, and the economic cost is extremely high; The detection time of the rapid microwave drying method is 1 - 5 minutes, the detection accuracy is ±0.2%RH, and the economic cost is extremely high for laboratory verification or small-batch detection; The present implementation method finally decides to adopt the capacitive sensing method. The reason for choosing the capacitive sensing method is that it has low cost and high detection efficiency. Therefore, a capacitive sensor 801 electrically connected to the heating wire 802 is introduced into the humidity adjustment component 8.

[0033] The capacitive sensor 801 is mounted on the bracket 3. Since most biomass particle raw materials are in a powdery structure, a self-cleaning sensor is provided on the capacitive sensor 801 to prevent the powder from adhering to the probe through ultrasonic vibration.

[0034] Embodiment 3 refer to Figures 1 to 6 As shown, this embodiment provides a vertical ring die pellet machine for producing biomass pellets. The structure of this embodiment is basically the same as that of the first embodiment, except that the raw material of the biomass pellets is straw pellets, the moisture content of the raw material is 15%, the temperature is 70°C, the aperture of the ring die 1 is 10mm, the compression ratio of the hydraulic device is 1:5, and the pressure of the pressure roller 901 is 10MPa.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A vertical ring die pellet machine for biomass pellet production, characterized in that: include: A mounting platform (2) for vertically mounting the ring die (1); A bracket (3) and a material blocking cover (4) arranged on the mounting platform (2); A cylinder (5) mounted on the bracket (3); A mounting cavity (6) provided on the cylinder (5); A conveyor belt (7) for conveying biomass particle raw materials, wherein an output end of the conveyor belt (7) is arranged correspondingly to an upper end of the installation cavity (6); A humidity adjustment component (8) arranged on the bracket (3) and in the installation cavity (6); A hyperbolic pressure roller group (9) symmetrically arranged in the installation cavity (6) and cooperating with the ring die (1); A pelletizing mechanism (10) is arranged at the bottom of the cylinder (5), and the pelletizing mechanism (10) is used to cooperate with the ring die (1) and the hyperbolic roller group (9) to produce biomass pellets.

2. A vertical ring die pellet machine for biomass pellet production according to claim 1, characterized in that: The surface of the ring die (1) is provided with a tungsten carbide coating. The mounting platform (2) is composed of a rectangular platform and a plurality of support rods. The mounting platform (2) is provided with a mounting circular hole for slidingly fitting the ring die (1). Two limiting rods (101) are fixedly connected to the bottom end of the ring die (1). The mounting platform (2) is provided with a limiting opening (201) and a limiting cavity (202) which are connected up and down. The inner wall of the limiting opening (201) completely matches the geometric shape of the outer hub of the limiting rod (101). The internal space of the limiting cavity (202) is precisely divided into two independent areas of equal volume. The geometric shape of each independent area completely matches the geometric shape of the outer hub of the limiting rod (101). One of the independent areas is arranged correspondingly to the limiting opening (201) up and down, and the other independent area is provided with a magnetic attraction sheet for magnetically fixing the limiting rod (101) on a side away from the limiting opening (201).

3. A vertical ring die pellet machine for biomass pellet production according to claim 1, characterized in that: The material blocking cover (4) is a circular ring-shaped structure with a notch on one side, and a material guide groove (203) inclined downward is provided at a position corresponding to the notch of the mounting platform (2) and the material blocking cover (4).

4. A vertical ring die pellet machine for biomass pellet production according to claim 1, characterized in that: The cavity of the installation cavity (6) is composed of a first truncated cone-shaped cavity, a drum-shaped cavity, a second truncated cone-shaped cavity and a cylindrical cavity from top to bottom. The first truncated cone-shaped cavity, the drum-shaped cavity, the second truncated cone-shaped cavity and the cylindrical cavity are seamlessly connected in the vertical direction to form a composite space structure. The end with a smaller diameter of one truncated cone-shaped cavity of the installation cavity (6) is arranged in the same direction as the end with a smaller diameter of another truncated cone-shaped cavity of the installation cavity (6).

5. A vertical ring die pellet machine for biomass pellet production according to claim 4, characterized in that: The humidity adjustment component (8) comprises: a capacitive sensor (801) mounted on the bracket (3), a probe of the capacitive sensor (801) embedded in the powder on the conveyor belt (7), and a self-cleaning sensor for preventing the powder from adhering to the probe through ultrasonic vibration provided on the capacitive sensor (801); A plurality of groups of heating wires (802) are mounted on the curved end surface of the drum-shaped cavity, and the capacitive sensor (801) is electrically connected to the heating wires (802).

6. A vertical ring die pellet machine for biomass pellet production according to claim 1, characterized in that: The hyperbolic pressure roller group (9) is composed of a plurality of pressure rollers (901), a variable frequency drive system (902) and a mounting frame (903).

7. A vertical ring die pellet machine for biomass pellet production according to claim 6, characterized in that: The pressing roller (901) has a hyperbolic geometric structure, the curvature radius of the pressing roller (901) is 50-100 mm, and the gap between the hyperbolic pressing roller group (9) and the ring die (1) is 0.1-0.3 mm.

8. A vertical ring die pellet machine for biomass pellet production according to claim 6, characterized in that: The variable frequency drive system (902) is used to adjust the pressure and speed of the pressure roller (901). The variable frequency drive system (902) is composed of a motor box with a variable frequency motor installed therein, a hydraulic device, a drive bracket, a drive rod and an intelligent control module. The drive bracket is arranged on the upper and lower sides of the pressure roller (901). The drive rod is fixed at the center of the drive bracket. A positioning sleeve for slidingly sleeved on the lower end of the drive rod is arranged at the center of the bottom end of the ring die (1). The variable frequency motor adjusts the speed of the pressure roller (901) in real time through the drive rod and the drive bracket. The hydraulic device is used to adjust the pressure of the pressure roller (901) in real time. The intelligent control module is used to feedback compression parameters in real time and automatically optimize the compression parameters. The top of the motor box is a pyramidal structure. The mounting frame (903) is composed of four mounting rods. The longitudinal cross-section of the mounting rod is a triangular structure, and the mounting rod is fixedly connected to the motor box.

9. A vertical ring die pellet machine for biomass pellet production according to claim 1, characterized in that: The pelletizing mechanism (10) comprises: A driving gear ring (1001) rotatably mounted on the mounting platform (2), wherein the outer wall of the lower end of the driving gear ring (1001) is provided with teeth; A plurality of pelletizing knives (1002) arranged on the upper surface of the driving gear ring (1001); A driving member (1003) mounted on the mounting platform (2) and used to drive the driving gear ring (1001) to rotate.

10. A vertical ring die pellet machine for biomass pellet production according to claim 9, characterized in that: The driving member (1003) is composed of a motor bracket, a motor and a gear, the motor bracket is fixedly connected to the mounting platform (2), the motor is mounted on the motor bracket, the gear is mounted on the output end of the motor, and the gear is meshedly connected to the driving gear ring (1001).

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