PLA particle vibrating screening equipment

Abstract

This utility model discloses a PLA particle vibrating screening device, relating to the field of PLA screening technology. It includes a screening chamber with a feed inlet at the top and an inclined screen at the bottom of the inner side. An air outlet is located above the screen on the inner side of the screening chamber, with several nozzles connected through the lower surface of the air outlet. An electric guide rail is located on one side of the inner wall of the screening chamber, and an mounting rod is slidably mounted on the electric guide rail. The end of the mounting rod is fixedly connected to the center of the upper surface of the air outlet. An installation groove is located on the other side of the inner wall of the screening chamber. This utility model utilizes the air outlet's linear movement on the screen surface to simultaneously direct a strong airflow generated by a powerful blower into the screening chamber. The high-speed airflow is precisely sprayed through the nozzles onto the screening chamber and the surface PLA particles. The strong air pressure effectively removes dust adsorbed on the screen surface, clears screen blockages in real time, and continuously maintains the screen's permeability.

Description

Technical Field

[0001] This utility model relates to the field of PLA screening technology, specifically to PLA particle vibrating screening equipment. Background Technology

[0002] PLA granules are bio-based polymer materials polymerized from lactic acid. They are white or transparent, biodegradable and biocompatible, and can be used to make biodegradable plastic bags, tableware, and mulch films. During processing, PLA granules usually need to be screened using a screening device. Screening can remove oversized or undersized particles to ensure that the product particle size meets production requirements and avoid problems such as uneven melting and unstable flowability caused by size differences during processing.

[0003] Existing PLA particle vibrating screening equipment typically has a closed screen box with a screen inside. The vibration is generated by a vibrating motor, causing the PLA particles to jump and be screened on the screen. The equipment has a feed inlet and multiple discharge outlets, which are used for feeding and discharging particles of different sizes.

[0004] During the PLA particle screening process, due to the electrostatic adsorption effect of particles and dust, a large amount of ultrafine dust with a particle size much smaller than the screen opening will adhere tightly to the surface of the screen due to the static electricity generated by friction, and may even agglomerate together, forming stubborn clumps in the screening equipment, clogging the screen opening and reducing screening efficiency. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a PLA particle vibrating screening device, which solves the problems mentioned in the background section.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: PLA particle vibrating screening equipment, including a screening chamber, a feed inlet at the top of the screening chamber, and an inclined screen at the bottom of the inner side of the screening chamber; An air outlet is located above the screen inside the screening chamber. Several nozzles are connected through the lower surface of the air outlet. An electric guide rail is provided on one side of the inner wall of the screening chamber. An installation rod is slidably installed on the electric guide rail. The end of the installation rod is fixedly connected to the center of the upper surface of the air outlet. An installation groove is opened on the other side of the inner wall of the screening chamber. A placement plate is provided on the outer wall of the screening chamber near the installation groove. A sliding groove is opened on the surface of the placement plate. A connecting pipe is fixedly connected to one end of the air outlet. The other end of the connecting pipe passes through the installation groove and extends to the outside of the screening chamber. A slider is sleeved on the surface of the connecting pipe. The slider is slidably connected inside the sliding groove. A corrugated pipe is fixedly connected to the end of the connecting pipe located on the outside of the screening chamber.

[0007] A powerful blower is installed on one side of the top of the screening chamber, and the output end of the powerful blower is fixedly connected to the corrugated pipe.

[0008] The top of the screening chamber is fixedly equipped with a material distribution box, and the bottom of the material distribution box is provided with a discharge port. The discharge port at the bottom of the material distribution box is connected to the inlet at the top of the screening chamber. The discharge port of the material distribution box is fixedly connected to an inlet box that extends into the screening chamber.

[0009] The inner side of the material distribution box is equipped with a material distribution roller. Both ends of the material distribution roller are fixedly connected to a rotating shaft, which is rotatably connected to the material distribution box. One of the rotating shafts passes through the material distribution box and extends to the outside of the material distribution box.

[0010] The outer wall of the material distribution box is fixedly equipped with a drive motor, and the output end of the drive motor is fixedly connected to the rotating shaft located on the outside of the material distribution box.

[0011] The screen is fixedly connected to one end of the inner side of the screening chamber. The two sides of the screen that is tilted upward are elastically connected to the mounting plate by springs. The screen that is tilted downward is rotatably connected to the front side of the inner wall of the screening chamber. A vibration motor is fixedly installed on the lower surface of the screen.

[0012] The top of the material distribution box is fixedly connected to a feeding hopper, and the opening at the bottom of the feeding hopper is connected to the inlet at the top of the material distribution box.

[0013] The bottom of the screening chamber is equipped with a storage box, and a handle is fixedly connected to the front of the storage box. The storage box is located directly below the screen.

[0014] This utility model provides a vibrating screening device for PLA particles, which has the following beneficial effects: 1. This utility model uses an air outlet to move linearly across the screen surface, simultaneously delivering a powerful airflow generated by a powerful blower into the screening chamber. The high-speed airflow is precisely sprayed through nozzles onto the screening chamber and the surface PLA particles. With strong wind pressure, the dust adsorbed on the screen surface is effectively stripped away, and the screen holes are cleared in real time, maintaining the screen's permeability.

[0015] 2. This utility model, by setting a distributing roller at the feed inlet and providing it with continuous and stable rotational power by a drive motor, forms a dynamic conveying path during the PLA particle feeding process, allowing the particles to fall precisely into the loading groove on the roller surface. As the distributing roller rotates at a uniform speed, the particles in the loading groove are orderly and quantitatively fed to the screen in batches, effectively avoiding the problem of PLA particle accumulation caused by one-time feeding, and greatly improving screening efficiency and accuracy. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall front structure of this utility model; Figure 2 This is a schematic diagram of the overall rear structure of this utility model; Figure 3 This is a side sectional view of the present invention. Figure 4 This is a cross-sectional view of the present invention. Figure 5 This utility model Figure 3 Enlarged schematic diagram of the structure at point A in the middle.

[0017] In the diagram: 1. Screening bin; 11. Mounting plate; 12. Electric guide rail; 13. Placement plate; 131. Slide chute; 2. Screen; 21. Vibrating motor; 22. Spring; 3. Air outlet; 31. Nozzle; 32. Mounting rod; 33. Connecting pipe; 34. Sliding block; 35. Corrugated pipe; 36. Powerful blower; 4. Distribution box; 41. Distribution roller; 42. Rotating shaft; 43. Drive motor; 44. Feed box; 5. Feed hopper; 6. Storage box; 61. Handle. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0019] Please see Figures 1 to 5 This utility model provides a technical solution: PLA particle vibrating screening equipment, including screening chamber 1, with a feed inlet at the top of screening chamber 1, and an inclined screen 2 at the bottom of the inner side of screening chamber 1. An air outlet duct 3 is provided on the inner side of the screening chamber 1 above the screen 2. Several nozzles 31 are connected through the lower surface of the air outlet duct 3. An electric guide rail 12 is provided on one side of the inner wall of the screening chamber 1. An installation rod 32 is slidably installed on the electric guide rail 12. The end of the installation rod 32 is fixedly connected to the center of the upper surface of the air outlet duct 3. An installation groove is opened on the other side of the inner wall of the screening chamber 1. A placement plate 13 is provided on the outer wall of the screening chamber 1 near the installation groove. A sliding groove 131 is opened on the surface of the placement plate 13. A connecting pipe 33 is fixedly connected to one end of the air outlet duct 3. The other end of the connecting pipe 33 passes through the installation groove and extends to the outside of the screening chamber 1. A dustproof curtain for sealing can be installed on the inner side of the installation groove to prevent the material from being blown out of the installation groove without affecting the sliding of the connecting pipe 33 in the installation groove. A slider 34 is sleeved on the surface of the connecting pipe 33. The slider 34 is slidably connected to the inside of the sliding groove 131. A corrugated pipe 35 is fixedly connected to one end of the connecting pipe 33 on the outside of the screening chamber 1. A long strip-shaped air outlet duct 3 is installed above the screen 2. The air outlet duct 3 is driven by an electric guide rail 12 and moves back and forth continuously on the surface of the screen 2. Several nozzles 31 are set on the lower side of the air outlet duct 3. The spray direction of the nozzles 31 is precisely aimed at the working surface of the screen 2. When the system is running, compressed air is delivered to the connecting pipe 33 through the corrugated pipe 35, and then delivered to the internal channel of the air outlet duct 3 and sprayed out at high speed from the nozzles 31, forming a stable airflow barrier. This can effectively remove dust particles attached to the surface of the screen 2, thereby maintaining the continuous permeability of the screen 2 and ensuring screening efficiency.

[0020] Among them, a powerful blower 36 is installed on one side of the top of the screening chamber 1, and the output end of the powerful blower 36 is fixedly connected to the corrugated pipe 35. The powerful blower 36 serves as the power source of the system, continuously generating high-pressure airflow. The airflow is then stably delivered to the interior of the connecting pipe 33 through the retractable corrugated pipe 35. The corrugated pipe 35 is contractile and can extend and move with the movement of the air outlet 3. The connecting pipe 33 is made of wear-resistant and pressure-resistant composite material hose. When the system is running, the airflow generated by the powerful blower 36 enters the connecting pipe 33 through the corrugated pipe 35, then enters the air outlet 3 and is blown out through the nozzle 31, forming a stable purging airflow.

[0021] Among them, a material distribution box 4 is fixedly installed at the top of the screening bin 1, and a material discharge port is opened at the bottom of the material distribution box 4. The material discharge port at the bottom of the material distribution box 4 is connected to the material inlet at the top of the screening bin 1. A material inlet box 44 extending into the interior of the screening bin 1 is fixedly connected to the material discharge port of the material distribution box 4. The material distribution box 4 is used to install the material distribution roller 41. The rotation of the material distribution roller 41 can realize the batch feeding of materials. The feed box 44 is fixedly connected to the feed port of the material distribution box 4. Its function is to transport PLA particles to the higher side of the screen 2 to ensure that the material can smoothly enter the screening bin 1 and be screened on the screen 2.

[0022] The inner side of the material distribution box 4 is provided with a material distribution roller 41. Both ends of the material distribution roller 41 are fixedly connected to a rotating shaft 42. The rotating shaft 42 is rotatably connected to the material distribution box 4. One of the rotating shafts 42 passes through the material distribution box 4 and extends to the outside of the material distribution box 4. The distributing roller 41 is connected to the inner wall of the distributing box 4 by rotating shafts 42 at both ends. The cylindrical surface of the distributing roller 41 has several circular cross-sections of loading grooves evenly opened along the circumference. The volume of each loading groove is precisely calculated to accommodate standard-measured PLA particles. When the system is working, the PLA particles fed above the distributing roller 41 fall into the loading grooves under the action of gravity. As the distributing roller 41 continues to rotate, the loading grooves filled with material rotate to the predetermined position below and automatically complete the unloading, realizing a precise batch feeding function.

[0023] Among them, a drive motor 43 is fixedly installed on the outer wall of the material distribution box 4, and the output end of the drive motor 43 is fixedly connected to the rotating shaft 42 located on the outside of the material distribution box 4. The drive motor 43 is fixed to a special mounting bracket by high-strength bolts. The mounting bracket is fixedly connected to the main body of the material distribution box 4 by welding. The drive motor 43 is a servo motor, which is directly driven by the material distribution roller 41 through the rotating shaft 42.

[0024] Among them, a mounting plate 11 is fixedly connected to one end of the inner side of the screening chamber 1, and the two sides of the upward inclined end of the screen 2 are elastically connected to the mounting plate 11 by springs 22 respectively. The downward inclined end of the screen 2 is rotatably connected to the front side of the inner wall of the screening chamber 1, and a vibration motor 21 is fixedly installed on the lower surface of the screen 2. The screen 2 adopts an inclined installation structure. Its high end is elastically mounted on the mounting plate 11 via a shock-absorbing spring 22. The spring 22 is made of stainless steel and has a pre-compression design to provide stable support. The bottom end is rotatably connected to the front wall of the inner cavity of the screening chamber 1 via a rotating shaft 42, allowing the screen 2 to vibrate freely within a certain angle range. A vibration motor 21 is installed at the bottom of the screen 2. This motor generates high-frequency excitation force through the rotation of the eccentric block, driving the entire screen 2 to vibrate in an elliptical trajectory, so that the material forms a uniform throwing motion on the screen surface, achieving efficient particle size classification. An extension plate is installed at the opening of the distribution box 4. Its top plane is slightly lower than the edge of the opening of the chamber, forming a smooth transition structure. At the same time, the inclination angle of the extension plate is precisely matched with the inclination angle of the screen 2, ensuring that when the material slides from the distribution box 4 to the screen 2, it can smoothly transition at the most suitable speed and angle, effectively avoiding material accumulation or splashing, and providing an efficient and stable connection guarantee for the screening process.

[0025] Among them, the top of the material distribution box 4 is fixedly connected to the feeding hopper 5, and the opening at the bottom of the feeding hopper 5 is connected to the feeding port at the top of the material distribution box 4. The feed hopper 5 adopts a conical structure design and is fixed at the top feed inlet of the screening chamber 1. The upper part of the feed hopper 5 is provided with a square feeding port, and the lower part of the discharge port is connected to the inside of the distribution box 4 to form a flow channel. The inner wall of the feed hopper 5 is polished and the side wall is set in an inclined mode to ensure that PLA particles can slide smoothly by gravity.

[0026] Among them, a storage box 6 is movably installed at the bottom of the screening bin 1, and a handle 61 is fixedly connected to the front side of the storage box 6. The storage box 6 is located directly below the screen 2. The storage bin 6 is located on the lower side of the screening bin 1, directly below the screen 2. The screening bin 1 can be pulled out from the opening on the lower side of the screening bin 1 through the handle 61. It is mainly used to collect the fine dust generated during the screening of PLA particles.

[0027] In summary, when using this PLA particle vibrating screening equipment, first start the drive system to bring all operating components to their rated operating speed. Then, the operator can feed the PLA particles to be screened through the feeding port of the feed hopper 5. The material falls evenly into the loading trough of the distribution roller 4 through the guiding effect of the feed hopper 5. The distribution roller 4 rotates at a uniform speed under the drive of the drive motor 43, quantitatively and batch-wise feeding the PLA particles onto the working surface of the screen 2. Under the high-frequency excitation of the vibrating motor 21 and the elastic support of the spring 22, the screen 2 generates stable three-dimensional vibration. The installation inclination angle of the screen 2 causes the PLA particles to form a continuous throwing motion on the screen surface, allowing particles that meet the particle size requirements to be screened. Qualified products retained on the surface of screen 2 through the sieve holes slide down the inclined sieve surface to the discharge port of the extension plate and enter the finished product collection process. The powerful blower 36 provides a stable airflow to the air outlet 3 through the corrugated pipe 35 and the connecting pipe 33. The air outlet 3, which moves back and forth on the surface of screen 2, forms a dynamic blowing airflow curtain through the nozzles 31 on its surface, effectively removing dust particles that are electrostatically adsorbed in the mesh of screen 2. The removed dust falls into the storage box 6 for centralized recycling under the action of gravity. This device achieves continuous self-cleaning of screen 2 through the synergistic effect of mechanical vibration and pneumatic cleaning, ensuring that the screening process is carried out efficiently and stably, and avoiding the mesh clogging problem common in traditional screening equipment.

[0028] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A PLA granule vibrating sieving apparatus comprising a sieving bin (1), characterized in that: The top of the screening chamber (1) is provided with a feed inlet, and the bottom of the inner side of the screening chamber (1) is provided with an inclined screen (2). An air outlet (3) is provided on the inner side of the screening chamber (1) above the screen (2). Several nozzles (31) are connected through the lower surface of the air outlet (3). An electric guide rail (12) is provided on one side of the inner wall of the screening chamber (1). An installation rod (32) is slidably installed on the electric guide rail (12). The end of the installation rod (32) is fixedly connected to the center of the upper surface of the air outlet (3). An installation groove is provided on the other side of the inner wall of the screening chamber (1). The outer wall of the screening chamber (1) is close to the installation groove. A placement plate (13) is provided at the position. A groove (131) is provided on the surface of the placement plate (13). A connecting pipe (33) is fixedly connected to one end of the air outlet (3). The other end of the connecting pipe (33) passes through the mounting groove and extends to the outside of the screening chamber (1). A slider (34) is sleeved on the surface of the connecting pipe (33). The slider (34) is slidably connected inside the groove (131). A corrugated pipe (35) is fixedly connected to one end of the connecting pipe (33) located outside the screening chamber (1).

2. The PLA particle vibration sieving apparatus according to claim 1, characterized in that: A powerful blower (36) is provided on one side of the top of the screening chamber (1), and the output end of the powerful blower (36) is fixedly connected to the corrugated pipe (35).

3. The PLA particle vibration sieving apparatus of claim 1, wherein: A material distribution box (4) is fixedly installed at the top of the screening bin (1). A material discharge port is opened at the bottom of the material distribution box (4). The material discharge port at the bottom of the material distribution box (4) is connected to the material inlet at the top of the screening bin (1). A material inlet box (44) extending into the interior of the screening bin (1) is fixedly connected at the material discharge port of the material distribution box (4).

4. The PLA particle vibration sieving apparatus of claim 3, wherein: The inner side of the material distribution box (4) is provided with a material distribution roller (41). Both ends of the material distribution roller (41) are fixedly connected with a rotating shaft (42). The rotating shaft (42) is rotatably connected to the material distribution box (4). One of the rotating shafts (42) passes through the material distribution box (4) and extends to the outside of the material distribution box (4).

5. The PLA particle vibration sieving apparatus according to claim 4, wherein: A drive motor (43) is fixedly installed on the outer wall of the material distribution box (4), and the output end of the drive motor (43) is fixedly connected to the rotating shaft (42) located on the outside of the material distribution box (4).

6. The PLA particle vibration sieving apparatus of claim 1, wherein: An installation plate (11) is fixedly connected to one end of the inner side of the screening chamber (1). The two sides of the upwardly inclined end of the screen (2) are elastically connected to the installation plate (11) by springs (22). The downwardly inclined end of the screen (2) is rotatably connected to the front side of the inner wall of the screening chamber (1). A vibration motor (21) is fixedly installed on the lower surface of the screen (2).

7. The PLA particle vibration sieving apparatus of claim 3, wherein: The top of the material distribution box (4) is fixedly connected to the feed hopper (5), and the opening at the bottom of the feed hopper (5) is connected to the feed inlet at the top of the material distribution box (4).

8. The PLA particle vibration sieving apparatus of claim 1, wherein: The bottom of the screening bin (1) is movably provided with a storage box (6), and a handle (61) is fixedly connected to the front side of the storage box (6). The storage box (6) is located directly below the screen (2).

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