Particle screening device for plastic pelletizing production line

Abstract

The invention relates to the technical field of particle screening devices, in particular to a particle screening device for a plastic pelletizing production line, which comprises a support frame, protective covers are fixedly mounted on the inner side of the support frame in a bilateral symmetry manner, and a screening roller is mounted between the two protective covers in bilateral symmetry; a plurality of grooves are formed in the inner side wall and the outer side wall of the screening roller in an annular array mode, a strip-shaped groove is formed in the bottom of the inner side of each groove in a penetrating mode, a plurality of first semicircular grooves are formed in one inner side wall of each strip-shaped groove at equal intervals, and contraction grooves are formed in the inner side walls, away from the first semicircular grooves, of the strip-shaped grooves. The plastic particle screening device has the beneficial effects that the circular shaft drives the limiting circular plate to rotate, the limiting circular plate drives the screening roller to rotate, when the screening roller rotates, the lifting plate on the inner side of the screening roller is driven to rotate, plastic particles continuously ascend and descend through the lifting plate, and the plastic particle screening efficiency is greatly improved through the reciprocating operation.

Description

Technical Field

[0001] This invention relates to the field of particle screening equipment technology, specifically to a particle screening device for a plastic pelletizing production line. Background Technology

[0002] Plastic granulation is a core process in plastics machining, processing plastic raw materials into granular products through steps such as heating and plasticizing, and extrusion molding. During plastic pelletizing, the size of the resulting granules must meet certain requirements. Some larger granules are inevitably produced during pelletizing, and these larger granules need to be screened out during collection. Currently, the method used is to employ vibration methods such as filters, allowing sized granules to fall out while larger granules are screened out. During screening, the granules are shaken or bounced back and forth to achieve screening. However, inevitably, large plastic granules become stuck in the sieve holes, preventing sized granules from passing through and falling for collection. Because there are many plastic granules on the sieve plate during screening, it is difficult to quickly clear the clogging, leading to screening obstruction and reduced efficiency. Furthermore, once some large granules are stuck in the sieve holes, other granules continue to press against them, causing some plastic granules to become firmly stuck in the sieve holes, greatly increasing the difficulty of subsequent sieve hole cleaning and hindering practical use. Summary of the Invention

[0003] The purpose of this invention is to provide a particle screening device for a plastic pelletizing production line to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a particle screening device for a plastic pelletizing production line, comprising a support frame, wherein protective covers are symmetrically fixedly installed on the inner side of the support frame, and a screening roller is installed between the two symmetrical protective covers. The inner and outer walls of the screening roller are provided with multiple grooves in a circular array. A strip groove is provided through the bottom of the inner side of each groove. Multiple first semi-circular grooves are provided at equal intervals on one inner wall of the strip groove. A shrinkage groove is provided on one inner wall of the strip groove away from the first semi-circular groove. An opening and closing mechanism is installed in each shrinkage groove. The screening roller has a loading and unloading port through its side, and a sealing cover is fixedly installed inside the loading and unloading port. Limiting circular plates are symmetrically fixedly installed at the left and right ends of the screening roller. Multiple transmission mechanisms are installed in a circular array inside each of the two limiting circular plates. The side of each limiting circular plate away from the screening roller is rotatably connected to the support frame through a circular shaft. One of the circular shafts is driven by the motor shaft of a servo motor fixedly installed outside the support frame. Locking mechanisms for locking the transmission mechanisms are installed inside both protective covers.

[0005] As a further embodiment of the present invention, the inner wall of the screening roller is fixedly connected with multiple lifting plates in a ring array, the protective cover is sleeved on the outside of the limiting circular plate, and the limiting circular plate is in rotational contact with the inner wall of the protective cover.

[0006] As a further embodiment of the present invention, the opening and closing mechanism includes a strip-shaped inner plate that is slidably installed in the shrinkage groove. The strip-shaped inner plate has a plurality of second semi-circular grooves equidistantly opened on the side near the first semi-circular groove. Each second semi-circular groove is spliced ​​with the adjacent first semi-circular groove to form a complete circular groove. Multiple spring pieces are equidistantly installed on the side of the strip inner plate away from the second semi-circular groove. One side of the spring piece abuts against the inner side of the shrinkage groove. The two ends of the strip inner plate are symmetrically fixedly connected with mating plates. The mating plates extend into the limiting circular plate and are inserted into the adjacent transmission mechanism.

[0007] As a further embodiment of the present invention, the side of the limiting circular plate is provided with a plurality of limiting grooves in a circular array, the limiting grooves are connected to the adjacent strip grooves and shrinkage grooves, the docking plate extends into the adjacent limiting grooves, each limiting groove is provided with an unlocking groove on its inner side, the side of the limiting circular plate is provided with a plurality of mounting grooves in a circular array, and one end of the locking mechanism is installed in the mounting groove. The transmission mechanism includes a sector-shaped slider installed in a limiting groove. One end of the sector-shaped slider has a through-hole groove, and a docking plate is inserted into the docking groove. A positioning groove is through-hole on the side of the sector-shaped slider. A transmission block is fixedly connected to the end of the fan-shaped slider away from the screening drum. The transmission block has a movable groove, and a retraction mechanism is installed in the movable groove.

[0008] As a further embodiment of the present invention, both the limiting groove and the sector slider have T-shaped cross-sections, and the sector slider is slidably connected to the limiting groove.

[0009] As a further embodiment of the present invention, the retraction mechanism includes a convex block slidably installed in the movable groove. The protrusion of the convex block passes through one end of the transmission block and extends to the outside. A pressing slope is provided on one side of the protrusion of the convex block outside the transmission block. A round rod is fixedly connected to one end of the convex block in the movable groove, and a return spring is sleeved on the round rod.

[0010] As a further embodiment of the present invention, the end of the round rod away from the convex block passes through the transmission block, and both the convex block and the round rod are slidably connected to the transmission block. The two ends of the return spring abut against the inner sidewall of the movable groove and one end of the convex block, respectively.

[0011] As a further embodiment of the present invention, the locking mechanism includes a plurality of positioning seats, which are slidably installed in adjacent mounting slots. One end of each positioning seat extends through the mounting slot into a limiting slot. A movable rod is rotatably mounted on the side of each positioning seat via a hinge. The end of the movable rod away from the positioning seat is rotatably connected to a slide block via a hinge. A T-shaped groove is provided on the side of the slide block, and a drive assembly is installed on the side of the slide block within a protective cover.

[0012] As a further embodiment of the present invention, the positioning seat is slidably connected to the limiting circular plate, and one end of the positioning seat located in the limiting groove is inserted into the positioning groove.

[0013] As a further embodiment of the present invention, the driving assembly includes an annular plate installed inside a protective cover. Hydraulic cylinders are symmetrically fixedly installed on both outer sides of the support frame. The ends of the inner rods of the hydraulic cylinders are connected to the annular plate via flanges. Guide plates are symmetrically fixedly connected to the sides of the annular plate. The ends of the two guide plates away from the annular plate penetrate the side of the support frame and are slidably connected to the support frame. Multiple extrusion columns are fixedly connected in a ring array on the side of the annular plate away from the guide plates. An annular guide rail is fixedly connected to the side of the annular plate inside the multiple extrusion columns. The slide block is engaged on the annular guide rail. The cross-section of the annular guide rail is T-shaped, and the T-groove is slidably connected to the annular guide rail.

[0014] The beneficial effects of this invention are: 1. The servo motor drives the circular shaft to rotate, which in turn drives the limiting circular plate to rotate. The limiting circular plate then drives the screening drum to rotate. As the screening drum rotates, it drives the lifting plate on its inner side to rotate. The lifting plate causes the plastic particles to rise and fall continuously, thus greatly improving the screening efficiency of the plastic particles.

[0015] 2. When the first and second semicircular grooves of the screening roller become clogged after prolonged use, affecting screening, the inner rod of the hydraulic cylinder is extended to push the annular plate closer to the limiting circular plate. This causes one end of the positioning seat in the locking mechanism to move out of the positioning groove of the fan-shaped slider, moving the extrusion column onto the path of the rotating convex block. At this time, the servo motor is started. When the convex block in the transmission mechanism contacts the extrusion column, the transmission mechanism cannot rotate synchronously with the limiting circular plate. The limiting circular plate continues to rotate until the unlocking groove on the limiting circular plate rotates to one end of the transmission block, aligning one end of the round rod with the unlocking groove. The extrusion column then presses the extrusion slope of the convex block, causing the convex block to retract into the movable groove, allowing one end of the round rod to insert into the unlocking groove. At the same time, the fan-shaped slider keeps the inner strip plate stationary through the docking plate, causing the side of the inner strip plate with the second semi-circular groove to slowly separate from the side of the strip groove with the first semi-circular groove; when the limiting circular plate drives the convex block in the transmission mechanism to separate from the extrusion column, the spring mechanism is reset, and the side of the inner strip plate with the second semi-circular groove contacts the side of the strip groove with the first semi-circular groove, causing the inner strip plate to reset, and the inner strip plate drives the transmission mechanism to reset. Repeat the above operation repeatedly, so that the side of the inner strip with the second semi-circular groove is separated from the side of the strip with the first semi-circular groove, and then they are merged. This causes the plastic particles stuck between the first and second semi-circular grooves to fall out, thus cleaning the plastic particles stuck in the screen holes. The cleaning process can be operated automatically, which greatly improves the cleaning efficiency.

[0016] 3. During the merging of the first and second semicircular grooves, the inner strip plate collides with the strip groove under the action of the spring force, which can effectively dislodge the particles stuck between the first and second semicircular grooves and improve the cleaning effect. After the plastic particles blocking the screening drum are cleaned, the servo motor is stopped, the inner rod of the hydraulic cylinder retracts and resets, and the drive assembly and locking mechanism are reset. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural view of the particle screening device used in a plastic pelletizing production line according to the present invention; Figure 2 This is a cross-sectional view of the particle screening device for a plastic pelletizing production line according to the present invention; Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point A in the middle; Figure 4 This is a side sectional view of the particle screening device for a plastic pelletizing production line according to the present invention; Figure 5 This is an exploded view of the structure of the particle screening device for a plastic pelletizing production line according to the present invention; Figure 6 This is a side sectional view of the structure of the screening roller, the limiting circular plate, and the transmission mechanism of the present invention; Figure 7 This is a cross-sectional view of the screening roller, lifting plate, and opening / closing mechanism of the present invention; Figure 8 This is a schematic diagram of the screening roller, sealing cover, and opening / closing mechanism of the present invention; Figure 9 This is an exploded view of the limiting circular plate, transmission mechanism, locking mechanism and drive assembly of the present invention; Figure 10 This is a schematic diagram of the structure of the present invention, in which the extrusion column is located on the rotation path of the convex block.

[0018] In the diagram: 1. Support frame; 11. Protective cover; 2. Screening roller; 21. Groove; 22. Strip groove; 23. First semi-circular groove; 24. Shrinkage groove; 25. Sealing cover; 26. Lifting plate; 3. Strip inner plate; 31. Second semi-circular groove; 32. Spring piece; 33. Butt joint plate; 4. Limiting circular plate; 41. Limiting groove; 42. Mounting groove; 43. Unlocking groove; 5. Fan-shaped slider; 51. Butt joint groove; 52. Positioning groove; 6. Transmission block; 61. Movable groove; 62. Convex block; 63. Extrusion inclined surface; 64. Round rod; 65. Return spring; 7. Annular plate; 71. Hydraulic cylinder; 72. Guide plate; 73. Extrusion column; 74. Annular guide rail; 8. Positioning seat; 81. Movable rod; 82. Slide seat; 83. T-groove. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1 to 10 This invention provides a technical solution: a particle screening device for a plastic pelletizing production line, comprising a support frame 1, characterized in that: protective covers 11 are symmetrically fixedly installed on the inner side of the support frame 1, and a screening roller 2 is installed between the two symmetrical protective covers 11. The inner and outer walls of the screening roller 2 are provided with multiple grooves 21 in a circular array. The multiple grooves 21 on the inner wall of the screening roller 2 and the multiple grooves 21 on the outer wall of the screening roller 2 are aligned one-to-one. A strip groove 22 is provided through the bottom of the inner side of each groove 21. The two grooves 21 aligned on the inner and outer walls of the screening roller 2 are connected through the strip groove 22. A multiple first semi-circular grooves 23 are provided at equal intervals on one inner wall of the strip groove 22. A shrinkage groove 24 is provided on one inner wall of the strip groove 22 away from the first semi-circular grooves 23. The two ends of the strip groove 22 and the shrinkage groove 24 are both through the two ends of the screening roller 2. An opening and closing mechanism is installed in each shrinkage groove 24. The side of the screening roller 2 has a through-hole for loading and unloading. A sealing cover 25 is fixedly installed inside the loading and unloading hole. The sealing cover 25 is detachably connected to the screening roller 2. Limiting circular plates 4 are symmetrically fixedly installed at the left and right ends of the screening roller 2. Multiple transmission mechanisms are installed in a circular array in both limiting circular plates 4. The number of transmission mechanisms is the same as the number of opening and closing mechanisms. The side of the two limiting circular plates 4 away from the screening roller 2 is rotatably connected to the support frame 1 through a circular shaft. The circular shaft is rotatably connected to the support frame 1 through a bearing. One of the circular shafts is driven by the motor shaft of a servo motor fixedly installed on the outside of the support frame 1. Locking mechanisms for locking the transmission mechanisms are installed in both protective covers 11.

[0021] The round shaft and the limiting round plate 4 are connected by a flange, and the motor shaft and the round shaft are connected by a coupling or flange. The motor shaft of the servo motor drives the round shaft to rotate, the round shaft drives the limiting round plate 4 to rotate, and the limiting round plate 4 drives the screening drum 2 to rotate.

[0022] Please see Figure 7 and Figure 8 The inner wall of the screening roller 2 is fixedly connected with multiple lifting plates 26 in a ring array. The position of the lifting plates 26 is offset from the position of the groove 21. The protective cover 11 is sleeved on the outside of the limiting circular plate 4. The side of the protective cover 11 is provided with an observation port. A transparent protective plate or transparent glass plate is installed in the observation port. The limiting circular plate 4 is in rotational contact with the inner wall of the protective cover 11.

[0023] When the screening drum 2 rotates, it drives the lifting plate 26 on its inner side to rotate. As the lifting plate 26 rotates upward from the bottom, it pushes the plastic particles inside the screening drum 2 upward. When the lifting plate 26 rotates upward from the bottom at an angle of more than 90 degrees, that is, when the screening drum 2 drives the lifting plate 26 to rotate to a downward tilted position, the plastic particles on the lifting plate 26 will slide down along the tilted lifting plate 26, causing the plastic particles to fall onto the inner wall of the screening drum 2 for screening. By continuously causing the plastic particles to rise and fall, the screening efficiency of plastic particles is greatly improved.

[0024] Please see Figures 6 to 8 The opening and closing mechanism includes a strip inner plate 3 that is slidably installed in the shrinkage groove 24. A plurality of second semi-circular grooves 31 are equally spaced on the side of the strip inner plate 3 near the first semi-circular groove 23. The number of second semi-circular grooves 31 is the same as the number of first semi-circular grooves 23 that are opened on the inner side of a strip groove 22. Each second semi-circular groove 31 is spliced ​​with the adjacent first semi-circular groove 23 to form a complete circular groove. Plastic particles are screened through the complete circular groove. Plastic particles that meet the requirements fall down through the complete circular groove, while larger plastic particles cannot pass through, thus completing the screening. Multiple spring pieces 32 are equidistantly installed on the side of the strip inner plate 3 away from the second semi-circular groove 31. One side of the spring piece 32 abuts against the inner side of the shrinkage groove 24. The spring piece 32 applies elastic force to the strip inner plate 3. Under the action of the elastic force of the spring piece 32, the side of the strip inner plate 3 with the second semi-circular groove 31 contacts the side of the strip groove 22 with the first semi-circular groove 23. That is, the second semi-circular groove 31 and the adjacent first semi-circular groove 23 are spliced ​​to form a complete circular groove. The two ends of the strip inner plate 3 are symmetrically fixedly connected with the mating plate 33. The mating plate 33 extends into the limiting circular plate 4 and is inserted into the adjacent transmission mechanism.

[0025] The inner strip plate 3 is an arc-shaped plate. The arc of the inner strip plate 3 is the same as that of the strip groove 22 and the shrinkage groove 24, so that the inner strip plate 3 can slide stably along the strip groove 22 and the shrinkage groove 24. The two ends of the inner strip plate 3 are on the same vertical plane as the two ends of the shrinkage groove 24, that is, the two ends of the inner strip plate 3 are on the same vertical plane as the two ends of the screening roller 2.

[0026] Please see Figure 2 , Figure 3 , Figure 9 and Figure 10 The side of the limiting circular plate 4 is provided with multiple limiting grooves 41 in a circular array. The limiting grooves 41, strip grooves 22 and shrinkage grooves 24 are all curved arc grooves, and the curvature of the limiting grooves 41, strip grooves 22 and shrinkage grooves 24 is the same. The number of limiting grooves 41 is the same as the number of strip grooves 22. The limiting grooves 41 are connected to the adjacent strip grooves 22 and shrinkage grooves 24. The docking plate 33 extends into the adjacent limiting grooves 41. The inner side of each limiting groove 41 is provided with an unlocking groove 43. The side of the limiting circular plate 4 is provided with multiple mounting grooves 42 in a circular array. The mounting grooves 42 are distributed inside the multiple limiting grooves 41, that is, the mounting grooves 42 are closer to the central axis of the limiting circular plate 4. One end of the locking mechanism is installed in the mounting groove 42. The transmission mechanism includes a sector-shaped slider 5 installed in the limiting groove 41. One end of the sector-shaped slider 5 is provided with a docking groove 51, and the docking plate 33 is inserted into the docking groove 51. The side of the sector-shaped slider 5 is provided with a positioning groove 52. The two ends of the fan-shaped slider 5 are respectively on the same vertical plane as the two sides of the limiting circular plate 4. The end of the fan-shaped slider 5 away from the screening roller 2 is fixedly connected to the transmission block 6. The transmission block 6 has a movable groove 61, and a retraction mechanism is installed in the movable groove 61.

[0027] Please see Figure 3 , Figure 9 and Figure 10 The cross-sections of the limiting groove 41 and the fan-shaped slider 5 are both T-shaped. The fan-shaped slider 5 is slidably connected to the limiting groove 41. Through the limiting groove 41, the fan-shaped slider 5 is firmly installed between the limiting circular plate 4 and the screening roller 2.

[0028] The retraction mechanism includes a convex block 62 that is slidably installed in the movable groove 61. The protrusion of the convex block 62 passes through one end of the transmission block 6 and extends to the outside. A pressing slope 63 is provided on one side of the protrusion of the convex block 62 outside the transmission block 6. A round rod 64 is fixedly connected to one end of the convex block 62 in the movable groove 61. A return spring 65 is sleeved on the round rod 64.

[0029] The end of the round rod 64 away from the convex block 62 passes through the transmission block 6. The convex block 62 and the round rod 64 are slidably connected to the transmission block 6. The two ends of the return spring 65 abut against the inner wall of the movable groove 61 and one end of the convex block 62, respectively. The return spring 65 applies elastic force to the convex block 62.

[0030] In the initial position, the side of the inner strip plate 3 with the second semi-circular groove 31 is in contact with the side of the strip groove 22 with the first semi-circular groove 23. At this time, the fan-shaped slider 5 is at one end of the limiting groove 41, and the transmission block 6 is offset from the unlocking groove 43. At this time, the end of the round rod 64 away from the convex block 62 abuts against the limiting round plate 4.

[0031] At this time, when the screening roller 2 rotates, it will drive the limiting circular plate 4 to rotate synchronously. The limiting circular plate 4 drives the multiple transmission mechanisms on it to rotate synchronously. When the convex block 62 in the transmission mechanism is obstructed by external force and cannot rotate with the limiting circular plate 4, the limiting circular plate 4 continues to rotate, while the transmission mechanism is obstructed by other objects and cannot rotate, causing the transmission mechanism and the limiting circular plate 4 to slide relative to each other. At this time, the limiting groove 41 on the limiting circular plate 4 slides along the fan-shaped slider 5 for a distance until the fan-shaped slider 5 contacts the other end of the limiting groove 41. At this time, the unlocking groove 43 on the limiting circular plate 4 rotates to one end of the transmission block 6, so that one end of the circular rod 64 is aligned with the unlocking groove 43; at this time, the limiting circular plate 4 continues to rotate, which will drive the transmission mechanism to rotate. The pressing inclined surface 63 of the convex block 62 in the transmission mechanism slides along the obstacle. The obstacle presses the pressing inclined surface 63 of the convex block 62, causing the convex block 62 to retract into the movable groove 61. The convex block 62 presses the reset spring 65. At the same time, the convex block 62 drives the circular rod 64 to move synchronously, so that one end of the circular rod 64 is inserted into the unlocking groove 43.

[0032] When the fan-shaped slider 5 is obstructed and cannot rotate synchronously with the limiting circular plate 4, the fan-shaped slider 5 keeps the strip inner plate 3 stationary through the docking plate 33. When the limiting circular plate 4 drives the screening roller 2 to rotate, the strip inner plate 3 does not rotate synchronously with the screening roller 2. At this time, the shrinkage groove 24 on the screening roller 2 rotates onto the strip inner plate 3, so that the shrinkage groove 24 fits onto the strip inner plate 3. The strip inner plate 3 squeezes the spring 32. At the same time, the side of the strip inner plate 3 with the second semi-circular groove 31 slowly separates from the side of the strip groove 22 with the first semi-circular groove 23.

[0033] After the convex block 62 retracts into the movable groove 61, the obstruction can no longer prevent the convex block 62 from rotating with the limiting circular plate 4; When the limiting circular plate 4 causes the convex block 62 in the transmission mechanism to separate from the obstruction, the protrusion of the convex block 62 moves to the outside of the transmission block 6 under the action of the return spring 65, so that the convex block 62 is reset. At the same time, the convex block 62 drives the round rod 64 to move into the movable groove 61, so that one end of the round rod 64 moves out from the unlocking groove 43. At this time, under the action of the elastic force of the spring plate 32, the strip inner plate 3 moves outward along the shrinkage groove 24. The side of the strip inner plate 3 with the second semi-circular groove 31 contacts the side of the strip groove 22 with the first semi-circular groove 23, so that the strip inner plate 3 is reset. The strip inner plate 3 drives the transmission mechanism to reset through the docking plate 33, so that the fan-shaped slider 5 slides back along the limiting groove 41. The fan-shaped slider 5 drives the transmission block 6 to be misaligned with the unlocking groove 43.

[0034] When the limiting circular plate 4 drives the convex block 62 to contact the obstruction again, the transmission mechanism and the strip inner plate 3 can no longer rotate. The above operation is repeated, and so on, so that the side of the strip inner plate 3 with the second semi-circular groove 31 and the side of the strip groove 22 with the first semi-circular groove 23 are separated and then merged, so that the plastic particles stuck between the first semi-circular groove 23 and the second semi-circular groove 31 fall off, and the plastic particles stuck in the screen holes are cleaned. The cleaning process can be operated automatically, which greatly improves the cleaning efficiency. Moreover, by separating the first semi-circular groove 23 and the second semi-circular groove 31, the particles stuck between the first semi-circular groove 23 and the second semi-circular groove 31 can be effectively dropped, improving the cleaning effect.

[0035] Please see Figure 3 , Figure 5 and Figure 9 The locking mechanism includes multiple positioning seats 8, the number of which is the same as the number of mounting slots 42. The multiple positioning seats 8 are slidably installed in adjacent mounting slots 42. One end of the positioning seat 8 extends through the mounting slot 42 into the limiting slot 41. A movable rod 81 is rotatably mounted on the side of the positioning seat 8 via a hinge. The end of the movable rod 81 away from the positioning seat 8 is rotatably connected to a slide 82 via a hinge. A T-shaped groove 83 is opened on the side of the slide 82. A drive assembly is installed on the side of the slide 82 inside the protective cover 11.

[0036] The positioning seat 8 is slidably connected to the limiting circular plate 4, and one end of the positioning seat 8 located in the limiting groove 41 is inserted into the positioning groove 52.

[0037] Please see Figure 2 , Figure 4 , Figure 5 and Figure 9The drive assembly includes an annular plate 7 installed inside the protective cover 11. Hydraulic cylinders 71 are symmetrically fixedly installed on the left and right outer sides of the support frame 1. The hydraulic cylinders 71 are installed through the side of the support frame 1. The end of the inner rod of the hydraulic cylinder 71 is connected to the annular plate 7 through a flange. Guide plates 72 are symmetrically fixedly connected to the side of the annular plate 7. The ends of the two guide plates 72 away from the annular plate 7 both penetrate through the side of the support frame 1, and the guide plates 72 are slidably connected to the support frame 1. When the annular plate 7 moves, it drives the guide plates 72 to slide along the support frame 1, so that the annular plate 7 can move stably. Multiple extrusion columns 73 are fixedly connected in an annular array on the side of the annular plate 7 away from the guide plates 72. An annular guide rail 74 is fixedly connected to the side of the annular plate 7 inside the multiple extrusion columns 73. The slide block 82 is locked on the annular guide rail 74. The cross-section of the annular guide rail 74 is T-shaped, and the T-groove 83 is slidably connected to the annular guide rail 74.

[0038] When the extrusion column 73 moves a certain distance close to the limiting circular plate 4, the extrusion column 73 is on the path of the rotating convex block 62. At this time, when the convex block 62 rotates with the limiting circular plate 4, the convex block 62 will come into contact with the extrusion column 73, and the extrusion column 73 will prevent the convex block 62 from continuing to rotate.

[0039] In the initial position, the inner rod of the hydraulic cylinder 71 is in a retracted state. At this time, the annular plate 7 is away from the limiting circular plate 4, and the extrusion column 73 is away from the limiting circular plate 4. At this time, the limiting circular plate 4 can drive the transmission mechanism to rotate normally. At the same time, one end of the positioning seat 8 is inserted into the positioning groove 52, and the fan-shaped slider 5 and the limiting circular plate 4 are relatively fixed through the positioning seat 8.

[0040] Multiple hydraulic cylinders 71 are controlled by a hydraulic system to control the direction and flow of liquid, ensuring that multiple hydraulic cylinders 71 expand and contract with the same speed and force. The movement status of each cylinder is monitored in real time by displacement sensors and a control system, and adjustments are made as needed to maintain synchronization. The control system receives feedback signals from the displacement sensors, processes them through algorithms, and adjusts the opening of the control valve group to achieve precise synchronization of displacement between the hydraulic cylinders 71. The control system also adjusts the movement commands of the four hydraulic cylinders 71, thereby achieving synchronous extension and retraction of the four hydraulic cylinders 71.

[0041] Working principle: When it is necessary to screen out larger plastic granules, first open the sealing cover 25, pour the plastic granules to be screened into the inner cavity of the screening drum 2 along the loading and unloading port, and then fix the sealing cover 25 on the loading and unloading port to complete the loading.

[0042] At this point, by adjusting, the positioning seat 8 in the locking mechanism is locked to the sector slider 5, so that the driving component is in the initial position, that is, the extrusion column 73 is away from the limiting circular plate 4. At this time, the limiting circular plate 4 can drive the transmission mechanism to rotate normally.

[0043] The servo motor drives the circular shaft to rotate, which in turn drives the limiting circular plate 4 to rotate. The limiting circular plate 4 then drives the screening drum 2 to rotate. As the screening drum 2 rotates, it drives the lifting plate 26 on its inner side to rotate. As the lifting plate 26 rotates upward from the bottom, it pushes the plastic particles inside the screening drum 2 upward. When the screening drum 2 drives the lifting plate 26 to rotate to a downward tilted position, the plastic particles on the lifting plate 26 will slide down along the tilted lifting plate 26, causing the plastic particles to fall onto the inner wall of the screening drum 2 for screening. The plastic particles that meet the requirements pass through the first semi-circular groove 23 and the second semi-circular groove 31 and fall downward, while larger plastic particles cannot pass through, thus completing the screening. By continuously causing the plastic particles to rise and fall, the screening efficiency of plastic particles is greatly improved.

[0044] When the limiting circular plate 4 rotates, it drives the transmission mechanism and the locking mechanism to rotate synchronously. At this time, the slide 82 in the locking mechanism rotates along the annular guide rail 74.

[0045] During screening, a collection box or conveyor belt is placed below the screening drum 2 to collect the screened particles.

[0046] After screening, open the sealing cover 25 and remove and collect the larger plastic particles from the screening roller 2.

[0047] When the screening roller 2 becomes clogged in the first semi-circular groove 23 and the second semi-circular groove 31 after prolonged use, affecting screening, first stop the rotation of the servo motor shaft. At this time, observe the position of the extrusion column 73 through the observation port on the side of the protective cover 11, and make the position of the extrusion column 73 and the convex block 62 staggered, that is, when the extrusion column 73 moves close to the limiting circular plate 4, it will not directly hit the convex block 62. If the position of the extrusion column 73 and the convex block 62 is aligned at this time, adjust by starting the servo motor to ensure that the position of the extrusion column 73 and the convex block 62 is staggered.

[0048] By controlling the extension of the inner rod of the hydraulic cylinder 71, the annular plate 7 is pushed to move closer to the limiting circular plate 4. At this time, the annular plate 7 drives the guide plate 72 to slide along the support frame 1, so that the annular plate 7 can move stably left and right. The annular plate 7 drives the slide block 82 to move synchronously through the annular guide rail 74. The slide block 82 pushes one end of the movable rod 81 to move closer to the limiting circular plate 4. At this time, the other end of the movable rod 81 pushes the positioning seat 8 to slide along the mounting groove 42. At this time, the positioning seat 8 moves closer to the central axis of the limiting circular plate 4, so that one end of the positioning seat 8 moves out of the positioning groove 52 of the fan-shaped slider 5. When the annular plate 7 moves, it drives the extrusion column 73 to move closer to the limiting circular plate 4. When one end of the positioning seat 8 separates from the positioning groove 52, the extrusion column 73 moves to the path of the rotating convex block 62.

[0049] At this time, the servo motor is started, causing the limiting circular plate 4 and the screening roller 2 to rotate. The limiting circular plate 4 drives multiple transmission mechanisms on it to rotate synchronously. When the convex block 62 in the transmission mechanism contacts the extrusion column 73, the limiting column 73 blocks the convex block 62, preventing the transmission mechanism from rotating synchronously with the limiting circular plate 4. At this time, the limiting circular plate 4 continues to rotate, causing the limiting groove 41 on the limiting circular plate 4 to slide along the fan-shaped slider 5 for a certain distance until the fan-shaped slider 5 contacts the other end of the limiting groove 41. At this time, the unlocking groove 43 on the limiting circular plate 4 rotates to one end of the transmission block 6, so that one end of the round rod 64 is aligned with the unlocking groove 43; at this time, the limiting circular plate 4 continues to rotate, which will drive the transmission mechanism to rotate. The pressing inclined surface 63 of the convex block 62 in the transmission mechanism slides along the pressing column 73. The pressing column 73 presses the pressing inclined surface 63 of the convex block 62, causing the convex block 62 to retract into the movable groove 61. At the same time, the convex block 62 drives the round rod 64 to move synchronously, so that one end of the round rod 64 is inserted into the unlocking groove 43.

[0050] When the transmission mechanism is blocked by the extrusion column 73 and cannot rotate, the fan-shaped slider 5 cannot rotate synchronously with the limiting circular plate 4. The fan-shaped slider 5 keeps the strip inner plate 3 stationary through the docking plate 33, so that the strip inner plate 3 cannot rotate synchronously with the screening roller 2. At this time, the shrinkage groove 24 on the screening roller 2 rotates onto the strip inner plate 3, so that the shrinkage groove 24 fits onto the strip inner plate 3. The strip inner plate 3 extrudes the spring 32, and at the same time, the side of the strip inner plate 3 with the second semi-circular groove 31 slowly separates from the side of the strip groove 22 with the first semi-circular groove 23.

[0051] Once the convex block 62 retracts into the movable groove 61, the extrusion column 73 can no longer block the convex block 62 from rotating with the limiting circular plate 4; When the limiting circular plate 4 causes the convex block 62 in the transmission mechanism to separate from the extrusion column 73, the protrusion of the convex block 62 moves to the outside of the transmission block 6 under the action of the return spring 65, so that the convex block 62 is reset. At the same time, the convex block 62 drives the round rod 64 to move into the movable groove 61, so that one end of the round rod 64 moves out of the unlocking groove 43. At this time, under the action of the elastic force of the spring plate 32, the strip inner plate 3 moves outward along the shrinkage groove 24. The side of the strip inner plate 3 with the second semi-circular groove 31 contacts the side of the strip groove 22 with the first semi-circular groove 23, so that the strip inner plate 3 is reset. The strip inner plate 3 drives the transmission mechanism to reset through the docking plate 33, so that the fan-shaped slider 5 slides back along the limiting groove 41. The fan-shaped slider 5 drives the transmission block 6 to be misaligned with the unlocking groove 43.

[0052] When the limiting circular plate 4 drives the convex block 62 in the transmission mechanism to contact the extrusion column 73 again, the transmission mechanism and the strip inner plate 3 will be unable to rotate again. Repeat the above operation, so that the side of the strip inner plate 3 with the second semi-circular groove 31 and the side of the strip groove 22 with the first semi-circular groove 23 are separated and then merged, so that the plastic particles stuck between the first semi-circular groove 23 and the second semi-circular groove 31 fall off, and the plastic particles stuck in the screen holes are cleaned. The cleaning process can be operated automatically, which greatly improves the cleaning efficiency. Furthermore, during the process of merging the first semi-circular groove 23 and the second semi-circular groove 31, the inner strip plate 3 and the strip groove 22 collide under the action of the elastic force of the spring piece 32, which can effectively dislodge the particles stuck between the first semi-circular groove 23 and the second semi-circular groove 31, thereby improving the cleaning effect.

[0053] After the plastic particles clogging the screening roller 2 are cleared, the servo motor is stopped, the inner rod of the hydraulic cylinder 71 retracts and resets, the drive assembly and locking mechanism are reset, the extrusion column 73 is moved away from the path of the rotating convex block 62, and the positioning seat 8 is inserted into the positioning groove 52 to complete the reset.

[0054] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A granule screening device for plastic pellet production line, comprising a support frame (1), characterized in that: The inner side of the support frame (1) is fixedly installed with protective covers (11) in left-right symmetry, two protective covers (11) in left-right symmetry are installed with screening drums (2) between them, the inner side wall and the outer side wall of the screening drum (2) are both annular arrays and are provided with a plurality of grooves (21), the inner side bottom of each groove (21) is provided with a strip-shaped groove (22) penetratingly, one inner side wall of the strip-shaped groove (22) is provided with a plurality of first semicircular grooves (23) equidistantly, one inner side wall of the strip-shaped groove (22) away from the first semicircular groove (23) is provided with a contraction groove (24), and each contraction groove (24) is installed with an opening and closing mechanism; The side of the screening drum (2) is provided with a loading and unloading opening penetratingly, the loading and unloading opening is fixedly installed with a sealing cover (25), and the left and right ends of the screening drum (2) are fixedly installed with limiting circular plates (4) in symmetry, a plurality of transmission mechanisms are installed in the two limiting circular plates (4) in annular arrays, and the sides of the two limiting circular plates (4) away from the screening drum (2) are both rotationally connected with the support frame (1) through a circular shaft, one of the circular shafts is driven by the motor shaft of a servo motor fixedly installed on the outer side of the support frame (1), and the two protective covers (11) are both installed with locking mechanisms for locking the transmission mechanisms.

2. A granule screening device for a plastic pellet production line according to claim 1, characterized in that: The inner side wall of the screening drum (2) is fixedly connected with a plurality of lifting plates (26) in annular arrays, the protective cover (11) is sleeved on the outer side of the limiting circular plate (4), and the limiting circular plate (4) is in rotational contact with the inner side wall of the protective cover (11).

3. A granule screening device for a plastic pellet production line according to claim 1, characterized in that: The opening and closing mechanism comprises a strip-shaped inner plate (3) slidingly installed in the contraction groove (24), a plurality of second semicircular grooves (31) are equidistantly provided on the side of the strip-shaped inner plate (3) close to the first semicircular groove (23), and each second semicircular groove (31) is spliced with the adjacent first semicircular groove (23) into a complete circular groove. A plurality of elastic sheets (32) are equidistantly installed on the side of the strip-shaped inner plate (3) away from the second semicircular groove (31), one side of the elastic sheet (32) is in abutment with the inner side of the contraction groove (24), the both ends of the strip-shaped inner plate (3) are fixedly connected with butt plates (33), the butt plates (33) extend into the limiting circular plate (4), and the butt plates (33) are inserted with the adjacent transmission mechanisms.

4. A granule screening device for a plastic pellet production line according to claim 3, characterized in that: The side of the limiting circular plate (4) is provided with a plurality of limiting grooves (41) in annular arrays, the limiting grooves (41) are communicated with the adjacent strip-shaped grooves (22) and contraction grooves (24), the butt plates (33) extend into the adjacent limiting grooves (41), the inner side of each limiting groove (41) is provided with an unlocking groove (43), the side of the limiting circular plate (4) is provided with a plurality of installation grooves (42) in annular arrays, and one end of the locking mechanism is installed in the installation groove (42); The transmission mechanism comprises a sector-shaped sliding block (5) installed in the limiting groove (41), one end of the sector-shaped sliding block (5) is provided with a butt groove (51) penetratingly, the butt plate (33) is inserted with the butt groove (51), and the side of the sector-shaped sliding block (5) is provided with a positioning groove (52) penetratingly. A transmission block (6) is fixedly connected to one end of the fan-shaped slider (5) away from the screening drum (2). A movable groove (61) is provided in the transmission block (6), and a retraction mechanism is installed in the movable groove (61).

5. A granule screening device for a plastic pellet production line according to claim 4, characterized in that: The cross-sections of the limiting groove (41) and the fan-shaped slider (5) are both T-shaped, and the fan-shaped slider (5) is slidably connected to the limiting groove (41).

6. A granule screening device for a plastic pellet production line according to claim 4, characterized in that: The retraction mechanism includes a convex block (62) slidably installed in the movable groove (61). The protrusion of the convex block (62) passes through one end of the transmission block (6) and extends to the outside. A pressing slope (63) is provided on one side of the protrusion of the convex block (62) outside the transmission block (6). A round rod (64) is fixedly connected to one end of the convex block (62) in the movable groove (61). A return spring (65) is sleeved on the round rod (64).

7. A granule screening device for a plastic pellet production line according to claim 6, characterized in that: The end of the round rod (64) away from the convex block (62) passes through the transmission block (6). The convex block (62) and the round rod (64) are slidably connected to the transmission block (6). The two ends of the return spring (65) abut against the inner wall of the movable groove (61) and one end of the convex block (62), respectively.

8. A granule screening device for a plastic pellet production line according to claim 4, characterized in that: The locking mechanism includes multiple positioning seats (8), which are slidably installed in adjacent mounting slots (42). One end of the positioning seat (8) extends through the mounting slot (42) into the limiting slot (41). A movable rod (81) is rotatably mounted on the side of the positioning seat (8) via a hinge. The end of the movable rod (81) away from the positioning seat (8) is rotatably connected to a slide (82) via a hinge. A T-shaped groove (83) is provided on the side of the slide (82). A drive assembly is installed on the side of the slide (82) inside the protective cover (11).

9. A granule screening device for a plastic pellet production line according to claim 8, characterized in that: The positioning seat (8) is slidably connected to the limiting circular plate (4), and one end of the positioning seat (8) located in the limiting groove (41) is inserted into the positioning groove (52).

10. A granule screening device for a plastic pellet production line according to claim 8, characterized in that: The drive assembly includes an annular plate (7) installed inside the protective cover (11). Hydraulic cylinders (71) are symmetrically fixedly installed on the left and right outer sides of the support frame (1). The end of the inner rod of the hydraulic cylinder (71) is connected to the annular plate (7) through a flange. Guide plates (72) are symmetrically fixedly connected to the side of the annular plate (7). The ends of the two guide plates (72) away from the annular plate (7) penetrate the side of the support frame (1) and the guide plates (72) are slidably connected to the support frame (1). Multiple extrusion columns (73) are fixedly connected in an annular array on the side of the annular plate (7) away from the guide plates (72). An annular guide rail (74) is fixedly connected to the side of the annular plate (7) inside the multiple extrusion columns (73). The slide block (82) is stuck on the annular guide rail (74). The cross-section of the annular guide rail (74) is T-shaped, and the T-groove (83) is slidably connected to the annular guide rail (74).

Images