A polypropylene particle screening device

Abstract

The application discloses a polypropylene particle screening device, and relates to the technical field of particle screening devices, which comprises a bottom plate, a hopper obliquely arranged on the bottom plate, a stirring rod for uniformly stirring polypropylene particles rotatably arranged in the hopper, a vibrating screen mechanism for screening polypropylene particles of different sizes slidably arranged at the bottom of the hopper, a feeding cover plate rotatably arranged at one end of the hopper with a higher horizontal height, a discharging mechanism arranged at one end of the hopper with a lower horizontal height, the discharging mechanism and the feeding cover plate being connected with each other through a linkage mechanism, the linkage mechanism being used for ensuring that when one group of the discharging cover plate or the discharging mechanism is open, the other group is closed, a driving mechanism arranged on the bottom plate, the driving mechanism comprising a driving assembly, a transmission assembly and a triggering assembly, the driving assembly driving the stirring rod to stir, and driving the transmission assembly and the triggering assembly to move at the same time, the transmission assembly driving the vibrating screen mechanism to vibrate in the hopper, and the triggering assembly triggering the discharging mechanism to move.

Description

Technical Field

[0001] This invention relates to the field of particle screening equipment, and in particular to a polypropylene particle screening equipment. Background Technology

[0002] Existing screening devices are all placed on a horizontal surface and vibrate vertically for rapid screening. This results in low screening efficiency and makes it difficult to handle qualified and unqualified products, further reducing the efficiency of the screening process.

[0003] In the prior art, such as Chinese utility model patent with publication number CN214521310U, a layered adjustment device for screening polypropylene particles is disclosed, including a box body. A hopper is installed on the top of the box body, and a stirring rod is installed inside the hopper. A screening chamber is fixedly installed inside the box body. A first screening screen, a second screening screen, and a coarse material screening screen are installed in the screening chamber. The bottom of the coarse material screening screen is connected to the screening chamber through a mounting block of a vibration device. The surface of the second screening screen is connected to the bottom of the first screening screen. One end of the second screening screen is connected to an adjustment mechanism through gear meshing. The motor of the adjustment mechanism is fixedly mounted on the surface of the connecting plate. The two ends of the connecting plate are fixedly connected to the surface of the screening chamber and the inner wall of the box. This utility model adjusts the position of the second screening screen through the adjustment mechanism. However, the screening efficiency of this prior art is low. This invention improves the screening efficiency of the device when screening polypropylene particles through an integrated design. At the same time, it makes it simple and quick to pick up and put in qualified and unqualified products. When adding raw materials, the device is sealed and unqualified products can be quickly removed. At the same time, the aperture of the screening screen can be easily and quickly adjusted to select the required polypropylene particle diameter. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention uses a vibrating screen mechanism to continuously vibrate the material, increasing screening efficiency; this invention ensures that the discharge port is sealed when adding materials, preventing the discharge port from being open during material addition; this invention allows for simple and quick adjustment of the screen mesh aperture, enabling arbitrary selection of the polypropylene particle diameter to be screened.

[0005] The technical solution adopted by this invention to solve its technical problem is as follows: a polypropylene particle screening device, including a base plate, a hopper inclinedly arranged on the base plate, a stirring rod for uniformly stirring polypropylene particles rotatably installed inside the hopper, a vibrating screen mechanism for screening polypropylene particles of different sizes slidably installed at the bottom of the hopper, a feed cover plate rotatably installed at the higher end of the hopper, and a discharge mechanism installed at the lower end of the hopper. The discharge mechanism and the feed cover plate are interconnected by a linkage mechanism. When the feed cover plate is open, the discharge mechanism is closed; when the discharge mechanism is open, the feed cover plate is closed. A drive mechanism is arranged on the base plate, including a drive component, a transmission component, and a trigger component. The drive component drives the stirring rod to stir while simultaneously driving the transmission component and the trigger component to move. The transmission component drives the vibrating screen mechanism to vibrate inside the hopper, and the trigger component triggers the discharge mechanism to move.

[0006] Furthermore, the vibrating screen mechanism includes a sliding shell slidably installed at the bottom of the hopper. The sliding shell has a through hole one, and the bottom of the hopper has a processing hole corresponding to the position of the through hole one. Screen one and screen two are slidably installed inside the sliding shell. One end of screen one is fixedly connected to rack one, and one end of screen two is fixedly connected to rack two. The hopper is provided with an adjustment component for adjusting one of screen one and screen two to communicate with the through hole one. Rack one and rack two are respectively engaged with the adjustment component.

[0007] Furthermore, the adjustment assembly includes a motor 1 mounted on the hopper, a gear 1 and a gear 4 fixedly mounted on the output shaft of the motor 1, and a gear 2 and a gear 3 rotatably mounted on the output shaft of the motor 1. The gear 2 and the gear 3 are connected by a sleeve. The rack 1 meshes with the gear 2, and the rack 2 meshes with the gear 1. The hopper is rotatably mounted with a gear 5 and a gear 6, and the gear 3 and the gear 4 mesh with the gear 6, and the gear 3 and the gear 4 mesh with the gear 5, respectively.

[0008] Furthermore, the discharge mechanism includes a discharge baffle rotatably mounted on the hopper, a connecting rod rotatably connected to the discharge baffle for driving the discharge baffle to open and close, the connecting rod rotatably connected to the triggering component, a connecting rod rotatably connected to the connection between the connecting rod rotatably and the discharge baffle, a slider rotatably mounted on the hopper, the slider rotatably connected to the connecting rod rotatably, and the slider rotatably connected to the linkage mechanism.

[0009] Furthermore, the linkage mechanism includes a second slider that is slidably mounted on the hopper, a third connecting rod that is rotatably mounted on one side of the second slider, the other end of the third connecting rod that is rotatably connected to the first slider, and a pin that is fixedly mounted on the other side of the second slider to restrict the opening of the feed cover.

[0010] Furthermore, a second through hole is provided on the feed cover plate, and the pin slides within the second through hole.

[0011] Furthermore, the drive assembly includes a second motor mounted on the base plate, a seventh gear fixedly mounted on the output shaft of the second motor, the seventh gear meshing with the transmission assembly and the trigger assembly, a universal joint fixedly mounted on the central shaft of the seventh gear, and the other end of the universal joint fixedly connected to the stirring rod.

[0012] Furthermore, the transmission assembly includes a gear eight rotatably mounted on the base plate, gear eight meshing with gear seven, a pulley fixedly mounted on the central shaft of gear eight, a roller shaft rotatably mounted on the base plate, the roller shaft and the pulley being connected by a transmission belt, turntables fixedly mounted at both ends of the roller shaft, a connecting rod four rotatably connected to the eccentric part of the turntable, a connecting rod five rotatably connected to the other end of the connecting rod four, the connecting rod five sliding in a groove opened in the hopper, and the connecting rod five being fixedly connected to the sliding shell.

[0013] Furthermore, the triggering component includes a bracket mounted on a base plate, a lead screw rotatably mounted on the bracket, a gear nine fixedly connected to one end of the lead screw, gear nine meshing with gear seven, a mating block threaded onto the lead screw, the mating block slidably connected to the bracket, and a pressure plate fixedly mounted on the mating block to restrict the movement of connecting rod six, connecting rod six rotatably mounted on the base plate, and a spring fixedly connected to connecting rod six, the other end of the spring fixedly connected to the base plate, and connecting rod seven rotatably connected to the other end of connecting rod six, a sliding groove one and a sliding groove two provided on the base plate, the central axes of sliding groove one and sliding groove two being perpendicular to each other, a slider three slidably connected in sliding groove one, a slider four slidably connected in sliding groove two, connecting rod seven rotatably connected to slider three, a connecting rod eight rotatably mounted on slider three, connecting rod eight rotatably connected to slider four, and slider four rotatably connected to connecting rod one.

[0014] Furthermore, a locking pin for engaging the connecting rod six is ​​rotatably mounted on the pressure plate, a torsion spring for resetting the locking pin is provided at the mounting location of the locking pin, and a release groove for releasing the connecting rod six is ​​provided on the pressure plate.

[0015] The advantages of this invention compared with the prior art are: (1) This invention uses a vibrating screen mechanism to continuously vibrate the material, thereby increasing the screening efficiency; (2) This invention ensures that the outlet is sealed when the worker adds the material, preventing the outlet from being open when the material is added; (3) This invention can easily and quickly adjust the aperture of the screen mesh and arbitrarily select the diameter of the polypropylene particles to be screened. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 This is a schematic diagram of the overall structure of the present invention from another angle.

[0018] Figure 3 This is a schematic diagram of the stirring rod structure of the present invention.

[0019] Figure 4 This is a schematic diagram of the vibrating screen mechanism of the present invention.

[0020] Figure 5 This is a schematic diagram of the adjustment component structure of the present invention.

[0021] Figure 6 This is a schematic diagram of the material discharge mechanism of the present invention.

[0022] Figure 7 This is a schematic diagram of the linkage mechanism of the present invention.

[0023] Figure 8 For the present invention Figure 7 Enlarged view of the structure at point A in the middle.

[0024] Figure 9 This is a schematic diagram of the drive mechanism structure of the present invention.

[0025] Figure 10 This is a schematic diagram of the driving component structure of the present invention.

[0026] Figure 11 This is a schematic diagram of the transmission component structure of the present invention.

[0027] Figure 12 This is a schematic diagram of the trigger component structure of the present invention.

[0028] Figure 13 This is a schematic diagram of the pressure plate structure of the present invention.

[0029] In the diagram: 1. Base plate; 2. Hopper; 3. Agitator; 4. Vibrating screen mechanism; 5. Feed cover plate; 6. Discharge mechanism; 7. Linkage mechanism; 8. Drive mechanism; a. Through hole one; b. Through hole two; c. Sliding groove one; d. Sliding groove two; e. Release groove; 401. Sliding shell; 402. Screen one; 403. Screen two; 404. Adjustment component; 405. Rack one; 406. Rack two; 40401. Motor one; 40402. Gear one; 40403. Gear two; 40404. Gear three; 40405. Gear four; 40406. Gear five; 40407. Gear six; 601. Discharge baffle; 602. Connecting rod one; 603. Connecting rod two; 604. Slider one; 701. Slider II; 702. Connecting Rod III; 703. Pin; 801. Drive Assembly; 802. Transmission Assembly; 803. Trigger Assembly; 80101. Motor II; 80102. Gear VII; 80103. Universal Joint; 80201. Gear VIII; 80202. Pulley; 80203. Roller; 80204. Turntable; 80205. Connecting Rod IV; 80206. Connecting Rod V; 80301. Bracket; 80302. Lead Screw; 80303. Gear IX; 80304. Mating Block; 80305. Pressure Plate; 80306. Connecting Rod VI; 80307. Connecting Rod VII; 80308. Slider III; 80309. Connecting Rod VIII; 80310. Slider IV. Detailed Implementation

[0030] In the following description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0031] In the following description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "setting," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; or they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0032] The present invention will now be further described with reference to the accompanying drawings and exemplary embodiments. The illustrative embodiments and descriptions herein are used to explain the invention, but are not intended to limit the invention. Furthermore, detailed descriptions of known technologies that are unnecessary to illustrate the features of the present invention are omitted.

[0033] Example: Figures 1-3 As shown, a polypropylene granule screening device includes a base plate 1, on which a hopper 2 is fixedly mounted at an incline. A stirring rod 3 for uniformly stirring polypropylene granules is rotatably mounted inside the hopper 2. A vibrating screen mechanism 4 for screening polypropylene granules of different sizes is slidably mounted at the bottom of the hopper 2. A feed cover plate 5 is rotatably mounted at the higher end of the hopper 2, and a discharge mechanism 6 is provided at the lower end of the hopper 2. The discharge mechanism 6 and the feed cover plate 5 are interconnected by a linkage mechanism 7. When the feed cover plate 5 is open, the discharge mechanism 6 is closed; when the discharge mechanism 6 is open, the feed cover plate 5 is closed. A drive mechanism 8 is provided on the base plate 1. The drive mechanism 8 includes a drive component 801, a transmission component 802, and a trigger component 803. The drive component 801 drives the stirring rod 3 to stir while simultaneously driving the transmission component 802 and the trigger component 803 to move. The transmission component 802 drives the vibrating screen mechanism 4 to vibrate within the hopper 2, and the trigger component 803 triggers the discharge mechanism 6 to move.

[0034] like Figure 1 , Figure 4 As shown, the vibrating screen mechanism 4 includes a sliding shell 401 slidably installed at the bottom of the hopper 2. The sliding shell 401 has a through hole a, and the bottom of the hopper 2 has a machining hole corresponding to the position of the through hole a. A screen 402 and a screen 403 are slidably installed inside the sliding shell 401. The screen aperture diameters of screen 402 and screen 403 are different, allowing for screen switching to change the size of the screened particles. One end of screen 402 is fixedly connected to a rack 405, and one end of screen 403 is fixedly connected to a rack 406. The hopper 2 is provided with a mechanism for adjusting screen 402. 402, 403, and one of the screens are connected to the through hole a. An adjustment component 404 is connected to the screen. Racks 405 and 406 are engaged with the adjustment component 404. When the adjustment component 404 is activated, it drives racks 405 and 406 to slide in opposite directions. Rack 405 drives screen 402 to slide, and rack 406 drives screen 403 to slide, so that one of the screens is connected to the through hole a. The adjustment component 404 allows the screen to be replaced, either screen 402 or screen 403, so that the present invention can screen out particles of different sizes as needed.

[0035] like Figure 1 , Figure 4 , Figure 5As shown, the adjusting assembly 404 includes a motor 40401 fixedly mounted on the hopper 2. Gear 40402 and gear 40405 are fixedly mounted on the output shaft of the motor 40401, and gear 40403 and gear 40404 are rotatably mounted on the output shaft of the motor 40401. Gear 40403 and gear 40404 are connected by a sleeve. Rack 405 meshes with gear 40403, and rack 406 meshes with gear 40402. Gear 40402 and gear 40403 move in opposite directions. Gear 5 40406 and gear 6 40407 are rotatably mounted on the hopper 2. Gear 3 40404 and gear 40405 mesh with gear 6 40407, and gear 3 40404 and gear 40405 mesh with gear 5 40406. All gears, including gears 3 (40404), 4 (40405), 5 (40406), and 6 (40407), are bevel gears. When the screen needs to be replaced, motor 1 (40401) is started. Motor 1 (40401) drives gears 1 (40402) and 4 (40405) to rotate. Gear 4 (40405) drives gears 5 (40406) and 6 (40407) to rotate. Gears 5 (40406) and 6 (40407) drive gear 3 (40404) to rotate. Gear 3 (40404) drives gear 2 (40403) to rotate, causing gears 1 (40402) and 2 (40403) to move in opposite directions. This, in turn, drives racks 1 (405) and 2 (406) to move in opposite directions. When the screen to be used is connected to through hole 1a, motor 1 (40401) is stopped, thus realizing the function of replacing the screen.

[0036] like Figure 1 , Figure 6 As shown, the discharge mechanism 6 includes a discharge baffle 601 rotatably mounted on the hopper 2. A connecting rod 602 for driving the discharge baffle 601 to open and close is rotatably connected to the discharge baffle 601. The connecting rod 602 is rotatably connected to the trigger assembly 803. A connecting rod 603 is rotatably connected to the connection between the connecting rod 602 and the discharge baffle 601. A slider 604 is slidably mounted on the hopper 2. The slider 604 is rotatably connected to the connecting rod 603 and is also rotatably connected to the linkage mechanism 7. When the trigger assembly 803 is running, the trigger assembly 803 drives the connecting rod 602 to swing. The connecting rod 602 drives the discharge baffle 601 to rotate and simultaneously drives the connecting rod 603 to swing. The discharge baffle 601 rotates, opening the discharge channel of the hopper 2, allowing large particles that cannot be screened to fall from the discharge channel. When the connecting rod 603 swings, it drives the slider 604 to slide, and the slider 604 drives the linkage mechanism 7 to move.

[0037] like Figure 1 , Figure 7 , Figure 8 As shown, the linkage mechanism 7 includes a second slider 701 slidably mounted on the hopper 2. A third connecting rod 702 is rotatably mounted on one side of the second slider 701, and the other end of the third connecting rod 702 is rotatably connected to a first slider 604. A pin 703 for restricting the opening of the feed cover 5 is fixedly mounted on the other side of the second slider 701. The feed cover 5 has a through hole 2b, and the pin 703 slides within the through hole 2b. When the first slider 604 slides, it drives the third connecting rod 702 to swing, and the third connecting rod 702 drives the second slider 701 to slide. Block 2 701 drives pin 703 to move. When pin 703 moves toward the feed cover plate 5, it inserts into through hole 2b, preventing the feed cover plate 5 from opening. At this time, the discharge mechanism 6 is in the open state. When pin 703 moves in the opposite direction of the feed cover plate 5, it slides out of through hole 2b, allowing the feed cover plate 5 to open. At this time, the discharge mechanism 6 is in the closed state. The linkage mechanism 7 ensures that when the operator opens the feed cover plate 5 to feed material into the hopper 2, the discharge mechanism 6 closes, preventing material from falling directly from the discharge channel without being screened.

[0038] like Figure 1 , Figure 9 , Figure 10 As shown, the drive assembly 801 includes a second motor 80101 fixedly mounted on the base plate 1. A seventh gear 80102 is fixedly mounted on the output shaft of the second motor 80101. The seventh gear 80102 is a bevel gear. The seventh gear 80102 meshes with the transmission assembly 802 and the trigger assembly 803. A universal joint 80103 is fixedly mounted on the central shaft of the seventh gear 80102. The other end of the universal joint 80103 is fixedly connected to the stirring rod 3. When the second motor 80101 is started, the second motor 80101 drives the seventh gear 80102 and the universal joint 80103 to rotate. The seventh gear 80102 drives the transmission assembly 802 and the trigger assembly 803 to move. The universal joint 80103 drives the stirring rod 3 to rotate, so as to fully stir the particles inside the hopper 2.

[0039] like Figure 1 , Figure 9 , Figure 11As shown, the transmission assembly 802 includes a gear 80201 rotatably mounted on the base plate 1. Gear 80201 is a bevel gear, and it meshes with gear 80102. A pulley 80202 is fixedly mounted on the central shaft of gear 80201. A roller 80203 is rotatably mounted on the base plate 1. The roller 80203 and the pulley 80202 are connected by a transmission belt. Turntables 80204 are fixedly mounted at both ends of the roller 80203. A connecting rod 80205 is rotatably connected to the eccentric part of the turntable 80204, and a connecting rod 80205 is rotatably connected to the other end of the connecting rod 80205. 0206, connecting rod five 80206 slides in the groove opened in hopper 2, and connecting rod five 80206 is fixedly connected to sliding shell 401; when gear seven 80102 drives gear eight 80201 to rotate, gear eight 80201 drives pulley 80202 to rotate, pulley 80202 drives roller shaft 80203 through transmission belt, roller shaft 80203 drives turntable 80204 to rotate, turntable 80204 drives connecting rod four 80205 to move, connecting rod four 80205 drives connecting rod five 80206 to slide, connecting rod five 80206 drives sliding shell 401 to slide up and down, playing the role of vibrating screen.

[0040] like Figure 1 , Figure 9 , Figure 12 , Figure 13As shown, the triggering component 803 includes a bracket 80301 fixedly mounted on the base plate 1. A lead screw 80302 is rotatably mounted on the bracket 80301. One end of the lead screw 80302 is fixedly connected to a gear 9 80303, which is a bevel gear. The gear 9 80303 meshes with the gear 7 80102. A mating block 80304 is threaded onto the lead screw 80302. The mating block 80304 is slidably connected to the bracket 80301. A pressure plate 80305 for limiting the movement of the connecting rod 6 80306 is fixedly mounted on the mating block 80304. The connecting rod 6 80306 is rotatably mounted on the base plate 1, and a spring is fixedly connected to the connecting rod 6 80306. (See attached diagram not shown). The other end of the spring is fixedly connected to the base plate 1. The other end of the connecting rod 6 80306 is rotatably connected to the connecting rod 7 80307. The base plate 1 has a sliding groove 1 c and a sliding groove 2 d, and the central axes of the sliding groove 1 c and the sliding groove 2 d are perpendicular to each other. A slider 3 80308 is slidably connected in the sliding groove 1 c, and a slider 4 80310 is slidably connected in the sliding groove 2 d. The connecting rod 7 80307 is rotatably connected to the slider 3 80308. A connecting rod 80309 is rotatably installed on the slider 3 80308. The connecting rod 80309 is rotatably connected to the slider 4 80310. The slider 4 80310 is rotatably connected to the connecting rod 1 602. The pressure plate 80305... A locking pin is rotatably installed to engage the connecting rod 80306. A torsion spring is provided at the locking pin mounting location for pin reset, and a release groove e is provided on the pressure plate 80305 for releasing the connecting rod 80306. In the initial state, one end of the connecting rod 80306 abuts against the bottom surface of the pressure plate 80305. When the gear 80303 rotates, the gear 80303 drives the lead screw 80302 to rotate. The lead screw 80302 drives the mating block 80304 to slide on the bracket 80301. The mating block 80304 drives the pressure plate 80305 to move. During the movement of the pressure plate 80305, the release groove e on the pressure plate 80305 moves to the connecting rod 80306, and the connecting rod 80306... One end of 306 loses the pressure of the pressure plate 80305 and bounces upward under the force of the spring. After one end of connecting rod 6 80306 bounces up, the other end of connecting rod 6 80306 swings downward, causing connecting rod 7 80307 to swing. Connecting rod 7 80307 causes slider 3 80308 to slide in sliding groove 1c. Slider 3 80308 causes connecting rod 8 80309 to swing. Connecting rod 8 80309 causes slider 4 80310 to slide in sliding groove 2d. Slider 4 80310 causes connecting rod 1 602 of discharge mechanism 6 to swing, pressing one end of connecting rod 6 80306 against the locking pin. The locking pin swings and presses connecting rod 6 80306 back onto the bottom surface of pressure plate 80305.

[0041] The working principle of this invention is as follows: The adjusting component 404 in the vibrating screen mechanism 4 is activated. The adjusting component 404 replaces the screen in the vibrating screen mechanism 4 according to the required particle screening specifications. The feed cover plate 5 is opened, and polypropylene particles are poured into the hopper 2. The driving component 801 in the driving mechanism 8 is activated. The driving component 801 drives the stirring rod 3 to fully stir the polypropylene particles in the hopper 2, while simultaneously driving the transmission component 802 and the trigger component 803 to move. The transmission component 802 drives the vibrating screen mechanism 4 to slide within the hopper 2, assisting in the vibrating screen. Mechanism 4 completes the screening more efficiently. The screened polypropylene granules fall through the screen and the processing hole at the bottom of the hopper 2. The granules that are too large and do not meet the screening standards remain in the hopper 2. At this time, the trigger component 803 drives the discharge mechanism 6 to move. After the discharge mechanism 6 is opened, the oversized material falls from the discharge mechanism 6. When the discharge mechanism 6 is opened, it drives the linkage mechanism 7 to move. The linkage mechanism 7 prevents the feed cover 5 from being opened, thus avoiding the addition of polypropylene granules into the hopper 2 due to the negligence of the staff when the discharge mechanism 6 is open.

[0042] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Those skilled in the art can modify the technical solutions described in the above embodiments, or make equivalent substitutions for some of the technical features; and all such modifications and substitutions should fall within the protection scope of the appended claims of the present invention.

Claims

1. A polypropylene particle screening device, comprising a bottom plate (1), characterized in that: A hopper (2) is inclinedly mounted on the base plate (1). A stirring rod (3) for uniformly stirring polypropylene granules is rotatably installed inside the hopper (2). A vibrating screen mechanism (4) for screening polypropylene granules of different sizes is slidably installed at the bottom of the hopper (2). A feed cover plate (5) is rotatably mounted at the higher end of the hopper (2). A discharge mechanism (6) is provided at the lower end of the hopper (2). The discharge mechanism (6) and the feed cover plate (5) are interconnected through a linkage mechanism (7). When the feed cover plate (5) is opened, the discharge mechanism... (6) Close. When the discharge mechanism (6) is opened, the feed cover (5) is closed. A drive mechanism (8) is provided on the bottom plate (1). The drive mechanism (8) includes a drive component (801), a transmission component (802), and a trigger component (803). The drive component (801) drives the stirring rod (3) to stir while driving the transmission component (802) and the trigger component (803) to move. The transmission component (802) drives the vibrating screen mechanism (4) to vibrate in the hopper (2). The trigger component (803) triggers the discharge mechanism (6) to move. The vibrating screen mechanism (4) includes a sliding shell (401) slidably installed at the bottom of the hopper (2). A through hole (a) is provided on the sliding shell (401). A processing hole corresponding to the position of the through hole (a) is provided at the bottom of the hopper (2). A screen (402) and a screen (403) are slidably installed inside the sliding shell (401). A rack (405) is fixedly connected to one end of the screen (402), and a rack (406) is fixedly connected to one end of the screen (403). An adjustment component (404) is provided on the hopper (2) for adjusting one of the screens (402) and the screen (403) to communicate with the through hole (a). The racks (405) and (406) respectively mesh with the adjustment component (404). The discharge mechanism (6) includes a discharge baffle (601) rotatably mounted on the hopper (2), a connecting rod (602) rotatably connected to the discharge baffle (601) for driving the discharge baffle (601) to open and close, the connecting rod (602) rotatably connected to the trigger component (803), a connecting rod (603) rotatably connected to the connection between the connecting rod (602) and the discharge baffle (601), a slider (604) slidably mounted on the hopper (2), the slider (604) rotatably connected to the connecting rod (603), and the slider (604) rotatably connected to the linkage mechanism (7); The linkage mechanism (7) includes a second slider (701) that is slidably mounted on the hopper (2). A third connecting rod (702) is rotatably mounted on one side of the second slider (701). The other end of the third connecting rod (702) is rotatably connected to a first slider (604). A pin (703) for limiting the opening of the feed cover (5) is fixedly mounted on the other side of the second slider (701).

2. The polypropylene particle screening device according to claim 1, characterized in that: The adjusting assembly (404) includes a motor (40401) mounted on the hopper (2). Gear 1 (40402) and gear 4 (40405) are fixedly mounted on the output shaft of motor 1 (40401), and gear 2 (40403) and gear 3 (40404) are rotatably mounted on the output shaft of motor 1 (40401). Gear 2 (40403) and gear 3 (40404) are connected by a sleeve. Gear 1 (405) meshes with gear 2 (40403), rack 2 (406) meshes with gear 1 (40402), gear 5 (40406) and gear 6 (40407) are rotatably mounted on hopper (2), gear 3 (40404) and gear 4 (40405) mesh with gear 6 (40407) respectively, and gear 3 (40404) and gear 4 (40405) mesh with gear 5 (40406) respectively.

3. The polypropylene particle screening device according to claim 2, characterized in that: The feed cover plate (5) has a through hole two (b), and the pin (703) slides in the through hole two (b).

4. The polypropylene particle screening device according to claim 1, characterized in that: The drive assembly (801) includes a second motor (80101) mounted on a base plate (1). A seventh gear (80102) is fixedly mounted on the output shaft of the second motor (80101). The seventh gear (80102) meshes with the transmission assembly (802) and the trigger assembly (803). A universal joint (80103) is fixedly mounted on the central shaft of the seventh gear (80102). The other end of the universal joint (80103) is fixedly connected to the stirring rod (3).

5. A polypropylene particle screening device according to claim 4, characterized in that: The transmission assembly (802) includes a gear eight (80201) rotatably mounted on a base plate (1), gear eight (80201) meshing with gear seven (80102), a pulley (80202) fixedly mounted on the central shaft of gear eight (80201), a roller shaft (80203) rotatably mounted on the base plate (1), the roller shaft (80203) and the pulley (80202) being connected by a transmission belt, a turntable (80204) fixedly mounted at both ends of the roller shaft (80203), a connecting rod four (80205) rotatably connected at the eccentric part of the turntable (80204), a connecting rod five (80206) rotatably connected at the other end of the connecting rod four (80205), the connecting rod five (80206) sliding in the groove opened in the hopper (2), and the connecting rod five (80206) fixedly connected to the sliding shell (401).

6. A polypropylene particle screening device according to claim 5, characterized in that: The triggering component (803) includes a bracket (80301) mounted on a base plate (1). A lead screw (80302) is rotatably mounted on the bracket (80301). One end of the lead screw (80302) is fixedly connected to a gear nine (80303). The gear nine (80303) meshes with a gear seven (80102). A mating block (80304) is threaded onto the lead screw (80302). The mating block (80304) is slidably connected to the bracket (80301). A pressure plate (80305) for limiting the movement of a connecting rod six (80306) is fixedly mounted on the mating block (80304). The connecting rod six (80306) is rotatably mounted on the base plate (1). A spring is fixedly connected to the connecting rod six (80306). The other end of the spring is fixedly connected to the base plate (1). The other end of the connecting rod six (80306) is rotatably connected to the connecting rod seven (80307). The base plate (1) is provided with sliding groove one (c) and sliding groove two (d), and the central axes of sliding groove one (c) and sliding groove two (d) are perpendicular to each other. Sliding slider three (80308) is slidably connected in sliding groove one (c). Sliding slider four (80310) is slidably connected in sliding groove two (d). Connecting rod seven (80307) is rotatably connected to sliding slider three (80308). Connecting rod eight (80309) is rotatably installed on sliding slider three (80308). Connecting rod eight (80309) is rotatably connected to sliding slider four (80310). Sliding slider four (80310) is rotatably connected to connecting rod one (602).

7. A polypropylene particle screening device according to claim 6, characterized in that: The pressure plate (80305) is rotatably mounted with a locking pin for engaging the connecting rod six (80306). A torsion spring for resetting the locking pin is provided at the mounting location of the locking pin, and a release groove (e) for releasing the connecting rod six (80306) is provided on the pressure plate (80305).

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