A plastic particle production screening device

Abstract

This utility model discloses a screening device for plastic granule production, relating to the field of plastic granule screening devices. The device includes a main support and side frames. A vibrating screen frame is inclinedly mounted on the upper side of the main support, with a fixed feeding hopper above it. The vibrating screen frame contains a material trough and a screen. A first collecting frame is located below the screen within the main support. An inverted conical moving frame is slidably configured within the vibrating screen frame. A motor on the side frames drives the moving frame to move via a rotating wheel and connecting rod. Sensor probes are embedded in the side plates of the vibrating screen frame. This device evenly spreads granules through the dynamic displacement of the moving frame. Combined with sensor probe monitoring and motor-driven control, it avoids screen accumulation and improves screening efficiency and accuracy.

Description

Technical Field

[0001] This utility model relates to the field of plastic particle screening devices, and in particular to a plastic particle production screening device. Background Technology

[0002] In the production of plastic granules, the screening process is crucial for ensuring uniform particle size. Existing plastic granule screening devices typically use vibrating screens in conjunction with inclined troughs to achieve particle grading. The working principle is as follows: the feed hopper conveys the granules to the surface of the vibrating screen; the screen vibration and the inclination angle of the trough cause the granules to slide along the screen surface. Particles smaller than the screen aperture fall into the collection frame, while larger particles are discharged from the discharge end. However, this type of device has the following significant drawbacks in practical applications:

[0003] First, when the amount of material discharged from the hopper is large or the particles have poor flowability, the particles are prone to local accumulation on the screen surface, which reduces the effective screening area of ​​the screen and prevents fine particles from passing through the screen holes in time, resulting in a significant decrease in screening efficiency.

[0004] Second, although increasing the vibration frequency or adjusting the tilt angle of the trough can disperse the particles to some extent, uneven distribution of vibration energy can easily lead to accumulation in some areas that cannot be eliminated. Furthermore, excessively high vibration frequencies can exacerbate equipment wear and increase energy consumption. The adjustment range of the tilt angle is also limited by the available space and particle flow, making it difficult to meet the needs of different working conditions.

[0005] In summary, existing screening methods may cause some fine particles that should pass through the screen to be trapped by larger particles and discharged from the discharge end without being screened, resulting in a decrease in screening accuracy and a lower finished product qualification rate.

[0006] In summary, how to make the particle distribution on the screen surface more uniform, ensure that fine particles have sufficient time to pass through the screen, and effectively improve screening efficiency has become a technical problem that needs to be solved. Utility Model Content

[0007] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0008] This utility model provides a screening device for producing plastic granules, including a main support and a side frame. An inclined vibrating screen frame is mounted on the upper side of the main support, and a fixed feeding hopper is positioned above the vibrating screen frame. The vibrating screen frame includes a material trough and a screen located at the bottom of the material trough. A first collecting frame is placed inside the main support, located below the screen. A movable frame is slidably mounted inside the vibrating screen frame. The movable frame has an inverted conical vertical cross-section and includes a feeding trough that matches the bottom outlet of the feeding hopper. A feeding port communicating with the feeding trough is opened at the bottom of the movable frame. A motor is fixedly mounted on the upper side of the side frame. The output side of the motor is rotatably connected to a rotating wheel. One side of a connecting rod is movably connected to the side of the rotating wheel, and the other side of the connecting rod is movably connected to the upper end of the movable frame. Multiple equally spaced sensor probes are embedded in the side plate of the vibrating screen frame.

[0009] As a preferred technical solution of the screening device of this utility model: the main support is provided with an inclined frame, and the vibrating screen frame is configured above the inclined frame through a vibration mechanism.

[0010] As a preferred technical solution of the screening device of this utility model: a sliding ramp is provided at the high position of the material trough of the vibrating screen frame, a discharge ramp is connected at the low position of the material trough of the vibrating screen frame, and a second collection frame is arranged below the discharge ramp.

[0011] As a preferred technical solution of the screening device of this utility model: guide rails are provided on both sides of the vibrating screen frame, and guide wheels are provided on the outer sides of both sides of the moving frame, with the guide wheels positioned at the guide rails.

[0012] As a preferred technical solution of the screening device of this utility model: a first rotating shaft is provided at the connection position between the moving frame and the connecting rod, and a second rotating shaft is provided at the connection position between the rotating wheel and the connecting rod.

[0013] As a preferred technical solution of the screening device of this utility model: the upper opening of the feeding trough of the movable frame that moves within the vibrating screen frame is kept directly below the bottom outlet of the feeding bin.

[0014] As a preferred technical solution of the screening device of this utility model: the range of motion of the feed port at the bottom of the moving frame corresponds to the distribution range of multiple sensor probes on the side plate of the vibrating screen frame.

[0015] Compared with existing technologies, the beneficial effects of this utility model are:

[0016] In this invention, the moving frame moves laterally along the vibrating screen frame under the drive of a motor. Its inverted conical structure, combined with the dynamic displacement of the feeding port, can evenly spread the particles output from the feeding hopper to different areas of the screen, avoiding the accumulation problem caused by traditional fixed feeding points. When the sensor probe detects that the particle accumulation height at a certain point on the screen exceeds the threshold, the motor speed is controlled to increase the moving speed of the moving frame, reducing the amount of material fed into the accumulation area and preventing excessive particles from accumulating in the same area. This "on-demand feeding" enables a more uniform distribution of particles on the screen surface, ensuring that fine particles have sufficient time to pass through the screen and effectively improving screening efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the screening device of this utility model.

[0018] Figure 2 for Figure 1 A magnified structural diagram of part A in the middle.

[0019] Figure 3 for Figure 1 A magnified structural diagram of section B in the middle.

[0020] Wherein: 1-Main support, 101-Inclined frame; 2-Side frame; 3-Vibrating screen frame, 301-Material trough, 302-Sliding ramp, 303-Screen, 304-Guide rail, 305-Discharge ramp; 4-Sensing probe; 5-First collection frame; 6-Discharge bin; 7-Moving frame, 701-Discharge trough, 702-Discharge port, 703-Guide wheel, 704-First rotating shaft; 8-Motor; 9-Rotating wheel, 901-Second rotating shaft; 10-Connecting rod; 11-Second collection frame. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0022] Example 1, Combination Figure 1 , Figure 2 , Figure 3 The plastic granule production screening device provided by this utility model mainly consists of a main support 1, a side frame 2, a vibrating screen frame 3, a feeding bin 6, a moving frame 7, a motor 8, a rotating wheel 9, a connecting rod 10, a sensor probe 4, a first collection frame 5, and a second collection frame 11, etc., as detailed below:

[0023] Main support 1: As the main support structure of the device, its internal space is used to place the first collection frame 5. The main support 1 is equipped with a slant bracket 101 for supporting the vibrating screen frame 3.

[0024] Side frame 2: Fixedly mounted on the side of the device for mounting motor 8.

[0025] Vibrating screen frame 3: Inclinedly mounted on the upper side of the main support 1, and installed above the inclined frame 101 via a vibration mechanism, it vibrates to screen plastic granules. The vibrating screen frame 3 includes a material trough 301, with a sliding ramp 302 at its higher position to facilitate the sliding of plastic granules; a discharge ramp 305 is connected at its lower position to discharge larger granules that do not pass through the screen. A second collection frame 11 is positioned below the discharge ramp 305 to collect larger granules. A screen 303 is installed at the bottom of the vibrating screen frame 3 to screen the plastic granules; granules smaller than the screen aperture fall through the screen into the first collection frame 5. Guide rails 304 are provided on both side plates of the vibrating screen frame 3 to facilitate the movement of the moving frame 7. Multiple equally spaced sensor probes 4 are embedded in the side plates of the vibrating screen frame 3 to monitor the accumulation of granules on the screen surface.

[0026] Feeding bin 6: Positioned above the vibrating screen frame 3, it is used to store and convey plastic granules downwards.

[0027] The movable frame 7 is slidably disposed within the vibrating screen frame 3. Its vertical cross-section is an inverted cone. The movable frame 7 includes a discharge trough 701 that mates with the bottom outlet of the discharge bin 6, used to receive plastic granules discharged from the discharge bin 6. A discharge port 702, communicating with the discharge trough 701, is opened at the bottom of the movable frame 7, through which the plastic granules fall onto the surface of the screen 303. Guide wheels 703 are provided on the outer sides of both side plates of the movable frame 7. The guide wheels 703 cooperate with the guide rails 304 on both side plates of the vibrating screen frame 3, allowing the movable frame 7 to move laterally within the vibrating screen frame 3. A first rotating shaft 704 is provided at the connection point between the movable frame 7 and the connecting rod 10, used to achieve a movable connection between the movable frame 7 and the connecting rod 10.

[0028] The movable frame 7 moves directly below the bottom outlet of the feeding hopper 6, ensuring that the upper opening of the feeding chute 701 is always directly below the bottom outlet of the feeding hopper 6 to receive the particles discharged from the feeding hopper 6. The range of motion of the feeding port 702 at the bottom of the movable frame 7 corresponds to the distribution range of multiple sensor probes 4 on the side plate of the vibrating screen frame 3. When the sensor probes 4 detect accumulation, the moving speed of the movable frame 7 can be controlled to adjust the feeding amount.

[0029] Motor 8: Fixedly mounted on the side of the frame 2, its output side is rotatably connected to the wheel 9, providing power for the movement of the entire device.

[0030] Rotating wheel 9: Connected to the output side of motor 8, it rotates and drives the moving frame 7 to move through connecting rod 10. Its end side is movably connected to connecting rod 10 through second rotating shaft 901.

[0031] Link 10: One end is movably connected to the wheel 9 via the second rotating shaft 901, and the other end is movably connected to the upper edge of the moving frame 7 via the first rotating shaft 704. It is used to transmit the movement of the wheel 9 and drive the moving frame 7 to move laterally within the vibrating screen frame 3.

[0032] Sensor 4: Embedded on the side plate of the vibrating screen frame 3, multiple sensors are evenly spaced to monitor the accumulation height of particles on the surface of the screen 303. When the accumulation height exceeds the threshold, a signal is sent to control the speed of the motor 8, increasing the moving speed of the moving frame 7 and reducing the amount of material discharged from the accumulation area.

[0033] First collection box 5: placed inside the main support 1, below the screen 303, for collecting fine particles that pass through the screen 303.

[0034] Second collection frame 11: Located below the discharge inclined plate 305, it is used to collect larger particles that do not pass through the screen 303.

[0035] Example 2: The working principle of this utility model's plastic granule screening device is as follows:

[0036] Plastic granules enter the feeding trough 701 of the moving frame 7 from the bottom outlet of the feeding bin 6, and then fall onto the surface of the screen 303 through the feeding port 702.

[0037] Motor 8 drives the rotating wheel 9 to rotate. The rotating wheel 9 drives the moving frame 7 to move laterally along the guide rail 304 inside the vibrating screen frame 3 via the connecting rod 10, so that the plastic particles can be evenly spread to different areas of the screen 303 and avoid local accumulation.

[0038] The vibrating screen frame 3 vibrates under the action of the vibrating mechanism, causing the plastic particles on the screen 303 to jump continuously. Small particles fall into the first collection frame 5 through the screen holes, while larger particles move down the feed trough 301 and enter the second collection frame 11 through the discharge inclined plate 305.

[0039] The sensor probe 4 monitors the particle accumulation height at various points on the surface of the screen 303 in real time. When the accumulation height at a certain point exceeds the threshold, the sensor probe 4 sends a signal to control the motor 8 to increase its speed, thereby increasing the moving speed of the moving frame 7, reducing the amount of material fed into that area, and preventing excessive particle accumulation. When no accumulation signal is detected, the moving frame 7 maintains its normal preset speed.

[0040] In this invention, the inverted conical structure and dynamic displacement design of the movable frame 7 can evenly spread the particles output from the feeding bin 6 to different areas of the screen 303, effectively avoiding the accumulation problem caused by the traditional fixed feeding point.

[0041] Moreover, the linkage control between the sensor probe 4 and the motor 8 enables "on-demand feeding". When accumulation is detected, the moving speed of the moving frame 7 is adjusted in time to ensure that the particles on the surface of the screen 303 are evenly distributed, so that fine particles have enough time to pass through the screen 303, which greatly improves screening efficiency and accuracy.

[0042] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A screening device for producing plastic granules, characterized in that: Includes a main support (1) and a side frame (2). The main support (1) is equipped with an inclined vibrating screen frame (3). A fixed feeding bin (6) is arranged above the vibrating screen frame (3). The vibrating screen frame (3) includes a trough (301) and a screen (303) located at the bottom of the trough (301). A first collection frame (5) located below the screen (303) is placed inside the main support (1). The vibrating screen frame (3) is slidably equipped with a movable frame (7) inside. The movable frame (7) has an inverted cone vertical section. The movable frame (7) includes a feeding trough (701) that matches the bottom outlet position of the feeding bin (6). The bottom of the movable frame (7) has a feeding port (702) that communicates with the feeding trough (701). The side frame (2) is fixedly equipped with a motor (8), the output side of the motor (8) is rotatably connected to a wheel (9), the side of the wheel (9) is movably connected to one end of a connecting rod (10), and the other end of the connecting rod (10) is movably connected to the upper end of the moving frame (7) along the position. The vibrating screen frame (3) has multiple equally spaced sensor probes (4) embedded in its side plate.

2. The plastic pellet production screening device according to claim 1, characterized in that: The main support (1) is provided with an inclined frame (101), and the vibrating screen frame (3) is arranged above the inclined frame (101) through a vibration mechanism.

3. The plastic pellet production screening device according to claim 1, characterized in that: A material sliding ramp (302) is provided at the high position of the material trough (301) of the vibrating screen frame (3), and a discharge ramp (305) is connected at the low position of the material trough (301) of the vibrating screen frame (3). A second collection frame (11) is arranged below the discharge ramp (305).

4. The plastic pellet production screening device according to claim 1, characterized in that: The vibrating screen frame (3) has guide rails (304) on both sides, and guide wheels (703) are provided on the outer sides of both sides of the moving frame (7), with the guide wheels (703) positioned at the guide rails (304).

5. A plastic pellet production screening device according to claim 1, characterized in that: A first rotating shaft (704) is provided at the connection position between the movable frame (7) and the connecting rod (10), and a second rotating shaft (901) is provided at the connection position between the rotating wheel (9) and the connecting rod (10).

6. The plastic pellet production screening device according to claim 1, characterized in that: The upper opening of the feed chute (701) of the movable frame (7) that moves within the vibrating screen frame (3) is located directly below the bottom outlet of the feed bin (6).

7. The plastic pellet production screening device according to claim 1, characterized in that: The range of motion of the discharge port (702) at the bottom of the movable frame (7) corresponds to the distribution range of multiple sensor probes (4) on the side plate of the vibrating screen frame (3).

Images