A rotary granulator
By using a stepper motor to drive the guide plate in the rotary pellet mill, the dynamic adjustment of the pellet falling position is achieved, which solves the problem of traditional rotary pellet mills requiring shutdown to change containers, and improves production efficiency and continuity.
Patent Information
- Application Number
- CN202522418014.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-14
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-11-14
AI Technical Summary
Traditional rotary granulators need to be stopped and replaced after the container is full, which interrupts the production process, reduces production efficiency, and increases labor costs.
The front and rear guide plates are driven by stepper motors, which enables dynamic adjustment of the falling position of the granules and allows the container to be changed without stopping the machine.
This achieves continuity and stability in the production process, reduces production interruption time caused by downtime, and improves production efficiency.
Smart Images
Figure CN224926058U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of granulator technology, specifically a rotary granulator. Background Technology
[0002] Traditional rotary granulators are commonly used equipment in industrial production for granulating powder materials. With their convenient operation and wide applicability, they are widely used in many fields such as chemical, building materials, and food. The rotation of the equipment causes powder materials to agglomerate into uniform granular products under certain conditions. In the production process of traditional rotary granulators, when the container for receiving granular products reaches its rated capacity, it is often necessary to stop the operation of the entire equipment and manually change the container. This not only directly interrupts the original continuous production rhythm, causing the production process to slow down and thus affecting the overall production efficiency, but also requires additional time costs for the entire process of container replacement, which increases the overall consumption in the production process. Utility Model Content
[0003] The purpose of this invention is to provide a rotary granulator to solve the problem that in the production process of traditional rotary granulators, when the container is full, the machine usually needs to be stopped to replace the container. This not only interrupts the production process and reduces production efficiency, but also increases the cost and time of manual operation.
[0004] To achieve the above objectives, this utility model provides the following technical solution:
[0005] A rotary granulator includes a frame, a feeding seat mounted on the top of the frame, a guide hopper fixedly connected to the top of the feeding seat, an opening on the circumferential surface of the guide hopper facing the feeding port of the feeding seat, a granulation cylinder fixedly connected to the top of the guide hopper, a front guide plate and a rear guide plate rotatably connected to the top of the feeding seat, the front guide plate and the rear guide plate being symmetrically arranged on the front and rear sides of the opening on the circumferential surface of the guide hopper, and the bottom ends of the front guide plate and the rear guide plate being attached to the top surface of the feeding seat.
[0006] Preferably, the granulation cylinder includes a feeding cylinder and an extrusion screen cylinder, the lower end of the extrusion screen cylinder is fixedly connected to the guide hopper, and the upper end of the extrusion screen cylinder is coaxially fixedly connected to the lower end of the feeding cylinder.
[0007] Preferably, the bottom of the guide hopper is an inclined surface that slopes towards the material drop outlet.
[0008] Preferably, the front guide plate and the rear guide plate are rotatably connected to the unloading seat via a rotating shaft, and the rotating shaft is located near the end of the guide hopper. Two stepper motors are fixedly installed on the surface of the frame, and the output ends of the two stepper motors are coaxially fixed with the rotating shafts of the front guide plate and the rear guide plate, respectively.
[0009] Preferably, the rotation radius of the front guide plate and the rear guide plate is greater than the straight-line distance from the material feeding seat to the opening on the circumferential surface of the guide hopper.
[0010] Compared with the prior art, the beneficial effects of this utility model are:
[0011] 1. The front and rear guide plates are driven by stepper motors, thereby rotating the guide plates and changing the falling position of the granules from the bottom of the feed seat. This achieves dynamic adjustment of the granule falling point, allowing the granules to be easily loaded into the next container without stopping the machine, effectively solving the problem of traditional granulators requiring machine stoppage for container replacement. Attached Figure Description
[0012] Figure 1 This is a front view of the entire utility model;
[0013] Figure 2 This is a top view of the entire utility model.
[0014] In the diagram: 1. Frame; 2. Feed hopper; 3. Front guide plate; 4. Feeding seat; 5. Feeding cylinder; 6. Extrusion screen cylinder; 7. Stepper motor; 8. Rear guide plate. Detailed Implementation
[0015] 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.
[0016] Please see Figures 1 to 2 This utility model provides a technical solution.
[0017] A rotary granulator includes a frame 1, a feeding seat 4 mounted on the top of the frame 1, a guide hopper 2 fixedly connected to the top of the feeding seat 4, an opening on the circumferential surface of the guide hopper 2 facing the discharge direction of the feeding seat 4, a granulation cylinder fixedly connected to the top of the guide hopper 2, a cutter disc assembled inside the granulation cylinder, and a drive motor installed inside the frame 1. The output end of the drive motor sequentially passes through the feeding seat 4, the guide hopper 2, and extends into the granulation cylinder, and is coaxially fixedly connected to the cutter disc. Activating the drive assembly drives the cutter disc to rotate, and the raw material is granulated. Inside the cylinder, the material is transformed into granules through rotational extrusion. The top of the feeding seat 4 is rotatably connected to a front guide plate 3 and a rear guide plate 8. The front guide plate 3 and the rear guide plate 8 are located on the front and rear sides of the opening on the circumferential surface of the guide hopper 2 and are arranged symmetrically. The bottom ends of the front guide plate 3 and the rear guide plate 8 are attached to the top surface of the feeding seat 4, which can change the falling position of the granules from the bottom of the feeding seat 4. This makes it convenient to adjust the falling position of the granules after the previous container is full and load them into the next container, which is beneficial for changing the container without stopping the machine.
[0018] The granulation cylinder includes a feeding cylinder 5 and an extrusion screen cylinder 6. The lower end of the extrusion screen cylinder 6 is fixedly connected to the guide hopper 2, and the upper end of the extrusion screen cylinder 6 is coaxially fixedly connected to the lower end of the feeding cylinder 5. The two are fixedly connected by a quick-release flange. The raw material is fed from the opening of the feeding cylinder 5, and after being squeezed by the rotating cutter disc, it is extruded from the grid of the extrusion screen cylinder 6 to form granules, which fall onto the guide hopper 2. The bottom of the guide hopper 2 is an inclined surface (e.g., an inclined surface at 30°) that is inclined downwards towards the drop outlet of the material seat 4, which facilitates the granules to slide along the inclined surface towards the drop outlet.
[0019] After the drive motor starts, the cutter disc rotates at high speed and generates a strong centrifugal force. Under the action of centrifugal force, the material is quickly pushed towards the screen holes of the extrusion cylinder 6. In this process, the material is squeezed and sheared by the cutter disc and gradually shaped into particles that match the shape and size of the screen holes. By using the gap between the cutter disc and the screen of different granulators, the particle density and surface roughness can be controlled.
[0020] Both the front guide plate 3 and the rear guide plate 8 are rotatably connected to the unloading seat 4 via a rotating shaft, and the rotating shaft is close to one end of the guide hopper 2. Two stepper motors 7 are fixedly installed on the surface of the frame 1. The output ends of the two stepper motors 7 are coaxially fixed with the rotating shafts of the front guide plate 3 and the rear guide plate 8, respectively. Starting the stepper motors 7 can control the rotating shafts to rotate, thereby driving the front guide plate 3 and the rear guide plate 8 to rotate.
[0021] One end of the rotating shaft is fixedly connected to the front guide plate 3 or the rear guide plate 8, and the other end is connected to the output shaft of the stepper motor 7. The rotation of the guide plate is realized by controlling the stepper motor 7.
[0022] The rotation radius of the front guide plate 3 and the rear guide plate 8 is greater than the straight-line distance from the drop opening of the feed seat 4 to the circumferential surface of the guide hopper 2. This ensures that after the two guide plates rotate, their outer ends can still extend outward beyond the bottom drop opening of the feed seat 4. The rotation radius of the two guide plates is designed to exceed the drop opening of the feed seat 4, ensuring that the guide plates can fully cover the drop opening range of the feed seat 4 during rotation, thus achieving effective switching of the drop point of the granular material.
[0023] The specific details of this plan are as follows:
[0024] Based on the required particle density and surface roughness for actual production, operators can select a granulator with a corresponding gap between the cutter head and the extrusion cylinder screen. During the operation of the granulator, operators need to observe the filling status of the first container in real time. When the granules in the container are about to be full and reach the set filling height, it indicates that the container needs to be replaced. At this time, due to the special design of this rotary granulator, subsequent container replacement operations can be carried out without stopping the machine, which greatly improves production efficiency and reduces production interruption time caused by downtime.
[0025] When it is determined that the container needs to be changed, the operator starts the stepper motor 7. Its output shaft drives the rotating shafts of the front guide plate 3 and the rear guide plate 8 to rotate. Since the front guide plate 3 and the rear guide plate 8 are both rotatably connected to the feed seat 4 through the rotating shaft, and the rotating shaft is close to one end of the feed hopper 2, the rotation of the rotating shaft can smoothly drive the two guide plates to rotate. Since the rotation radius of the two guide plates is greater than the straight distance from the drop opening of the feed seat 4 to the opening of the feed hopper 2, the outer ends of the two guide plates will extend outward beyond the drop opening of the feed seat 4 during the rotation, thereby changing the falling position of the granular material.
[0026] When adjusting the position of the guide plate, the operator needs to control the rotation angle of the stepper motor 7 according to the position of the next container. For example, if the next container is behind the current container, the operator needs to control the stepper motor 7 to rotate the front guide plate 3 and the rear guide plate 8 clockwise by a certain angle; if it is in front, it rotates counterclockwise. Here, the angle can be controlled by controlling the number of pulses according to the working principle of the stepper motor 7. For example, if the step angle of the stepper motor 7 is 1.8 degrees, and a 36-degree rotation is required, 20 pulses are input. In this way, the granules can be accurately dropped into the next container, ensuring the continuity and stability of the production process.
[0027] The drive motor is a three-phase asynchronous motor, with power options ranging from 5.5 to 15kW. This type of motor has advantages such as simple structure, reliable operation, and convenient maintenance, and can meet the power requirements of different production scales and material characteristics. To achieve precise control of the cutter head speed, the motor is equipped with a frequency converter. The frequency converter achieves stepless speed regulation of the motor by changing the frequency and voltage of the motor power supply. During operation, the operator can flexibly adjust the motor speed through the frequency converter according to the characteristics of the material and the requirements of the granulation process, thereby achieving precise control of the cutter head speed. The motor output shaft is connected to the drive shaft through a coupling, and the drive shaft transmits the motor power to the gear reduction box. The gear reduction box uses gear transmission to output power to the cutter head. Through a reasonable gear ratio design, the high speed of the motor is reduced to the working speed range required by the cutter head, while increasing the output torque, ensuring that the cutter head can provide sufficient extrusion and shearing forces during rotation, so that the material can be smoothly extruded into granules.
[0028] To achieve precise control of the front guide plate 3 and the rear guide plate 8, two stepper motors 7 are used to drive them respectively. A stepper motor is an actuator that converts electrical pulse signals into angular or linear displacement. It has advantages such as high precision, fast response speed, and simple control. A stepper motor with a step angle of 1.8° means that the motor shaft will rotate 1.8° for each pulse signal received. By precisely controlling the number and frequency of pulse signals, the rotation angle of the guide plate can be precisely controlled. The stepper motor has a built-in encoder, which can provide real-time feedback of the position signal of the motor shaft. When the stepper motor receives the control pulse signal and starts to rotate, the encoder will synchronously detect the position change of the motor shaft and feed the position signal back to the control system. The control system compares the feedback position signal with the preset target position and adjusts the output of the pulse signal in real time, thereby achieving precise closed-loop control of the guide plate position. This is a common motor control method without any innovation or improvement, and will not be described in detail here.
[0029] 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 rotary granulator, comprising a frame (1), characterized in that: The top of the frame (1) is equipped with a feeding seat (4), and the top of the feeding seat (4) is fixedly connected to a guide hopper (2). The circumferential surface of the guide hopper (2) has an opening, and the opening direction is towards the drop direction of the feeding seat (4). The top of the guide hopper (2) is fixedly connected to a granulation cylinder. The top of the feeding seat (4) is rotatably connected to a front guide plate (3) and a rear guide plate (8). The front guide plate (3) and the rear guide plate (8) are respectively located on the front and rear sides of the opening on the circumferential surface of the guide hopper (2) and are symmetrically arranged. The bottom ends of the front guide plate (3) and the rear guide plate (8) are both attached to the top surface of the feeding seat (4).
2. The rotary granulator according to claim 1, characterized in that, The granulation cylinder includes a feeding cylinder (5) and an extrusion screen cylinder (6). The lower end of the extrusion screen cylinder (6) is fixedly connected to the guide hopper (2), and the upper end of the extrusion screen cylinder (6) is coaxially fixedly connected to the lower end of the feeding cylinder (5).
3. The rotary granulator according to claim 1, characterized in that, The bottom of the guide hopper (2) is an inclined surface that slopes towards the drop outlet of the material seat (4).
4. The rotary granulator according to claim 1, characterized in that... The front guide plate (3) and the rear guide plate (8) are rotatably connected to the feed seat (4) through a rotating shaft, and the rotating shaft is close to one end of the guide hopper (2). Two stepper motors (7) are fixedly installed on the surface of the frame (1). The output ends of the two stepper motors (7) are coaxially fixed with the rotating shafts of the front guide plate (3) and the rear guide plate (8), respectively.
5. A rotary granulator according to claim 1, characterized in that, The rotation radius of the front guide plate (3) and the rear guide plate (8) is greater than the straight-line distance between the drop outlet of the feed seat (4) and the opening on the circumferential surface of the guide hopper (2).