A screening device for recycled plastic particles

Abstract

The present invention belongs to the field of plastic processing, and specifically relates to a screening device for recycled plastic particles, comprising a screening machine, wherein a feeding end for feeding is arranged on the top of the screening machine, a discharging end for discharging is arranged on the bottom, and an openable material taking door is installed at intervals on the side wall; a sieve plate mechanism is arranged in sequence along the transmission direction of the plastic particles, comprising a vibration part and a sieve plate part arranged outside and inside the screening machine, the sieve plate part comprises a sieve plate frame and a sieve plate, and sieve holes are arranged on the sieve plate; a flap mechanism comprises a flap arranged on one side of the sieve plate, and the flap is controlled by a direction adjustment part to rotate along the clamping gap between the sieve plate and the screening machine; a support plate of the cleaning mechanism is movably arranged, and when the support plate and the sieve plate are attached, a push rod penetrates the sieve holes opened on the sieve plate, and pushes the plastic particles retained in the sieve holes out of the sieve holes, so as to prevent the sieve holes from being blocked, automatically complete the cleaning of the sieve holes, and ensure that the screening channel of the plastic particles is in a smooth state.

Description

Technical Field

[0001] The invention relates to the field of plastic processing, and in particular to a screening device for recycled plastic particles. Background Art

[0002] Recycled plastic particles belong to the category of plastic particles. Recycled plastics are plastics produced by recycle used new materials or waste plastics through screw extrusion, and then cut into granular plastic particles by a pelletizer. Recycled plastic particles have a wide range of applications. In daily life, recycled particles can be used to make various plastic bags, buckets, basins, toys, furniture, stationery and other daily necessities and various plastic products. In the clothing industry, it can be used to make clothing, ties, buttons, zippers. In terms of building materials, the derivative plastic wood profiles of recycled plastic particles are used to manufacture various building components, plastic doors and windows, etc. In the chemical industry, it can be used to make reactors, pipes, containers, pumps, valves, etc., and is used in chemical production sites to solve corrosion and wear. In agriculture, it can be used to make agricultural films, water pipes, agricultural machinery, fertilizer packaging bags, and cement packaging bags. In addition, recycled particles are also widely used in the electrical industry and the telecommunications industry.

[0003] The prior art has the following problems:

[0004] When screening recycled plastic particles, the sieve holes will be blocked by large plastic particles, resulting in the inability of qualified particles to fall into the next sieve hole for secondary screening. Since there are many plastic particles on the sieve plate during screening, it is difficult to quickly clean the blocked sieve holes, resulting in screening obstruction and affecting efficiency. Summary of the invention

[0005] 1. Purpose of the invention

[0006] In order to solve the technical problems existing in the background technology, the present invention provides a screening device for recycled plastic particles, which has the characteristics of automatically cleaning the sieve holes and improving the screening progress.

[0007] (II) Technical solution

[0008] In order to solve the above technical problems, the present invention provides a screening device for recycled plastic particles, comprising a screening machine, wherein the top of the screening machine is provided with a feeding end for feeding, the bottom is provided with a discharging end for discharging, and the side wall is provided with an openable material taking door at intervals;

[0009] The sieve plate mechanism is sequentially arranged along the transmission direction of the plastic particles, including a vibration part and a sieve plate part arranged outside and inside the screening machine, the sieve plate part includes a sieve plate frame and a sieve plate, and the sieve plate is provided with sieve holes;

[0010] The flap mechanism comprises a flap arranged on one side of the sieve plate, and the flap is controlled by the direction adjustment part to rotate along the clamping gap between the sieve plate and the screening machine platform;

[0011] The cleaning mechanism comprises a supporting plate arranged below the sieve plate, on which a push rod matched with the sieve hole is installed, and which is controlled by the push of the top extension structure to approach or move away from the sieve plate.

[0012] Preferably, at least two groups of sieve plate mechanisms are arranged along the conveying direction of the plastic particles, and the number of sieve holes of each sieve plate in the conveying direction increases successively.

[0013] Preferably, the sieve plate is adapted to the specifications of the adjacent push rod.

[0014] Preferably, the vibration part of the screen plate mechanism includes a vibration table frame installed on the outer wall of the screening machine, a vibration motor is installed on the vibration table, the output end of the vibration motor is connected to the screen plate frame in the inner cavity of the screening machine through a conduction rod, and the screen plate frame and the screen plate vibrate synchronously.

[0015] Preferably, the adjustment part of the flap mechanism includes a motor and an axis frame symmetrically installed on the outer wall of the screening machine, and the output end of the motor is equipped with an adjustment shaft rotating along the axial hole of the axis frame, and the outer wall of the adjustment shaft is sleeved with the flap, and the flap is attached to the inner wall of the screening machine in an initial state.

[0016] Preferably, the extension portion of the cleaning mechanism comprises a cylinder mounted on the inner wall of the screening machine, a telescopic rod movable up and down is mounted on the output end of the cylinder, the other end of the telescopic rod is connected to an inclined support, and the top of the support is connected to the support plate.

[0017] Preferably, a plastic transmission gap is left between the support plate and the sieve plate, and a plastic transmission gap is left between adjacent push rods. When the support plate and the sieve plate are attached, the push rods penetrate the sieve holes opened on the sieve plate.

[0018] Preferably, the rod adjusting mechanism includes a pulley arranged on the support plate, the pulley is connected to an external driving device through a wheel axle, a rotatable belt is installed on the wheel axle, a first rod frame and a second rod frame are installed on the opposite side of the belt, a top rod is installed on the first rod frame and the second rod frame respectively, the first rod frame and the second rod frame have the same displacement distance and opposite displacement directions.

[0019] Preferably, the first rod frame and the second rod frame are long strip structures, and a number of top rods matching the sieve plate are installed at intervals on the long strips.

[0020] Preferably, an air induction device for air intake is installed at the bottom of the flap, and an air outlet grille penetrating the upper surface of the flap is installed at the output end of the air induction device, and air outlet slots are spaced apart on the air outlet grille.

[0021] The above technical solution of the present invention has the following beneficial technical effects:

[0022] 1. The support plate of the cleaning mechanism is movable. When the support plate and the sieve plate are attached, the push rod penetrates the sieve holes opened on the sieve plate, and pushes the plastic particles retained in the sieve holes out of the sieve holes to prevent the sieve holes from being blocked. The sieve holes are cleaned automatically to ensure that the screening channel of the plastic particles is in a smooth state.

[0023] 2. Adjust the fixed push rod to a movable design. Because the belt is set to rotate and is controlled by a driving device connected to the wheel shaft, the belt rotates on the pulley, and the first rod frame rises to drive the push rod to penetrate into the sieve holes of the sieve plate to push out the plastic particles. At this time, the second rod frame descends to drive the push rod away from the sieve holes of the sieve plate, exposing the sieve holes on one side to be unobstructed. Normal screening of plastic particles can be carried out in the sieve holes in the unobstructed state, so that half of the sieve holes are in a cleaning state and the other half of the sieve holes are in an unobstructed state, which can solve the problem of screening stopping during the cleaning process and improve the screening efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 It is a cross-sectional structural schematic diagram of the present invention;

[0026] Figure 3 It is a schematic diagram of the separation structure of the sieve plate mechanism and the cleaning mechanism of the present invention;

[0027] Figure 4 It is a schematic diagram of the combined structure of the sieve plate mechanism and the cleaning mechanism of the present invention;

[0028] Figure 5 It is a schematic diagram of the coordination structure of the sieve plate mechanism and the cleaning mechanism of the present invention;

[0029] Figure 6 It is a schematic diagram of the structure of the flap mechanism of the present invention;

[0030] Figure 7 It is a schematic structural diagram of a first embodiment of the rod adjusting mechanism of the present invention;

[0031] Figure 8 It is a schematic structural diagram of a second embodiment of the rod adjusting mechanism of the present invention.

[0032] Reference numerals:

[0033] 1. Screening machine; 11. Feed end; 12. Discharge end; 13. Reclaiming door; 21. Vibration table; 22. Vibration motor; 23. Conducting rod; 24. Screen plate frame; 25. Screen plate; 31. Motor; 32. Shaft frame; 33. Adjustment shaft; 34. Flap; 41. Cylinder; 42. Telescopic rod; 43. Support; 44. Support plate; 45. Push rod; 51. Air induction device; 52. Air outlet grille; 61. Pulley; 62. Axle; 63. Belt; 64. First rod frame; 65. Second rod frame. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0035] like Figure 1-6 As shown, a screening device for recycled plastic particles proposed by the present invention comprises a screening machine 1, wherein a feeding end 11 for feeding is arranged at the top of the screening machine 1, a discharging end 12 for discharging is arranged at the bottom, and an openable material taking door 13 is installed at intervals on the side wall;

[0036] The sieve plate mechanism is sequentially arranged along the transmission direction of the plastic particles, including a vibration part and a sieve plate part arranged outside and inside the screening machine 1, and the sieve plate part includes a sieve plate frame 24 and a sieve plate 25, and the sieve plate 25 is provided with sieve holes;

[0037] When screening plastic particles, the finished plastic particles are first provided to the screening machine 1 from the feed end 11, and the plastic particles are screened through the sieve plate mechanism. The plastic particles that meet the requirements of the last screening are removed from the discharge end 12, and the remaining plastic particles in the other screenings are taken out by the openable material taking door 13;

[0038] The flap mechanism includes a flap 34 arranged on one side of the screen plate 25, and the flap 34 is controlled by the adjustment part to rotate along the clamping gap between the screen plate 25 and the screening machine 1;

[0039] The cleaning mechanism comprises a support plate 44 arranged below the sieve plate 25 , on which a push rod 45 matching the sieve holes is mounted, and which is moved closer to or away from the sieve plate 25 under the control of the push of the push-out structure.

[0040] It should be noted that: at least two groups of sieve plate mechanisms are arranged along the transmission direction of the plastic particles. In the present application, three groups of sieve plate mechanisms are arranged. The number of sieve holes of each sieve plate 25 in the transmission direction increases successively, and it is divided into primary screening, secondary screening and tertiary screening. After graded screening by the three sieve plate mechanisms, the plastic particles are divided into four grades.

[0041] The sieve hole specifications of the sieve plate 25 on each sieve plate mechanism are adapted to the specifications of the adjacent push rod 45 , so as to push the plastic particles out of the sieve hole by the upward push of the push rod 45 .

[0042] As an example of the working of the sieve plate mechanism: The vibration of the sieve plate mechanism comes from the vibrating part:

[0043] The vibration part of the screen plate mechanism includes a vibration table 21 installed on the outer wall of the screening machine 1, and a vibration motor 22 is installed on the vibration table 21. The output end of the vibration motor 22 is connected to the screen plate frame 24 in the inner cavity of the screening machine 1 through a conduction rod 23. The output end of the vibration motor 22 outputs a vibration of a certain frequency, and the vibration is transmitted to the screen plate frame 24 through the conduction rod 23. The screen plate frame 24 and the screen plate 25 vibrate synchronously. The vibration amplitude of the screen plate 25 can be adjusted according to the output frequency of the vibration motor 22. The plastic particles are flipped up and down under the vibration of the screen plate 25, and the plastic particles smaller than the sieve hole specifications fall into the next screen plate mechanism for re-screening.

[0044] The combination of the screen frame 24 and the screen plate 25 is an inclined structure. Compared with a flat screen surface, the inclined screen surface provides the plastic particles with an additional downward tilting force, which, combined with the falling gravity, makes it easier for the plastic particles to fall during the screening process.

[0045] like Figure 6 As shown, the adjustment part of the flap mechanism includes a motor 31 and an axis frame 32 symmetrically installed on the outer wall of the screening machine 1, and an adjustment shaft 33 rotating along the axis hole of the axis frame 32 is installed at the output end of the motor 31. The outer wall of the adjustment shaft 33 is sleeved with a flap 34, and the flap 34 is attached to the inner wall of the screening machine 1 in the initial state.

[0046] Among them, in the initial state, the flap 34 is attached to the inner wall of the screening machine 1, and the end surface of the flap 34 attached to the screening machine 1 corresponds to the opening of the material taking door 13, which is used to take out the plastic particles retained on the sieve plate 25 and the flap 34;

[0047] During the upward rotation process, the motor 31 drives the adjustment shaft 33 to rotate upward along the axial hole of the shaft frame 32, driving the flap 34 and the screen plate 25 to form an "L-shaped" structure. During the vibration screening of plastic particles by the screen plate 25, the plastic particles are always retained in the "L-shaped" structure to prevent the plastic particles from sliding to the flat flap 34 and causing leakage.

[0048] During the downward rotation, the screen plate 25, the flap 34 and the closed end faces of the inner wall of the screening machine 1 can be opened, and the plastic particles retained in the upper part can all fall to the lower layer by tilting downward, and are uniformly collected through the discharge end 12.

[0049] It should be supplemented that: an air induction device 51 for air intake is installed at the bottom of the flap 34, and an air outlet grille 52 penetrating the upper surface of the flap 34 is installed at the output end of the air induction device 51, and air outlet slots are spaced apart on the air outlet grille 52.

[0050] Among them, a blowing structure is installed on the flap 34, and the gas is sucked in through the draft device 51. When the flap 34 and the sieve plate 25 are combined into an "L-shaped" structure, the gas is blown onto the plastic particles of the "L-shaped" structure through the air outlet groove of the air outlet grille 52. On the one hand, the floating dust in the plastic particles can be blown up, and on the other hand, the plastic particles can be blown to float to the upper part of the inclined sieve plate 25, so that the plastic particles are always in an active state, which is convenient for screening.

[0051] like Figure 3-5 As shown, the top extension part of the cleaning mechanism includes a cylinder 41 installed on the inner wall of the screening machine 1, and a telescopic rod 42 that can move up and down is installed at the output end of the cylinder 41. The other end of the telescopic rod 42 is connected to an inclined support 43, and a support plate 44 is connected to the top of the support 43.

[0052] Among them, a plastic transmission gap is left between the support plate 44 and the screen plate 25, and a plastic transmission gap is left between adjacent top rods 45. After the plastic particles are filtered through the sieve holes of the screen plate 25, the plastic particles fall onto the inclined support plate 44 and fall along the inclined support plate 44 to the next screening mechanism.

[0053] As a working example of the cleaning mechanism: the cylinder 41 drives the telescopic rod 42 at the output end to drive the support 43 to move upward, and the support plate 44 is close to the sieve plate 25. When the support plate 44 and the sieve plate 25 are attached, the push rod 45 penetrates the sieve holes opened on the sieve plate 25, and pushes the plastic particles retained in the sieve holes out of the sieve holes to prevent the sieve holes from being blocked. The sieve holes are cleaned automatically to ensure that the screening channel of the plastic particles is in a smooth state.

[0054] It should be added that when the cleaning mechanism is used to clean the sieve holes of the sieve plate 25, the screening is temporarily stopped until the plastic particles blocked in the sieve holes are ejected.

[0055] like Figure 7 As shown, the rod adjusting mechanism includes a pulley 61 arranged on the support plate 44, the pulley 61 is connected to an external driving device through a wheel shaft 62, a rotatable belt 63 is installed on the wheel shaft 62, a first rod frame 64 and a second rod frame 65 are installed on the opposite side of the belt 63, and the first rod frame 64 and the second rod frame 65 are respectively installed with a top rod 45, the first rod frame 64 and the second rod frame 65 have the same displacement distance, and the displacement direction is opposite.

[0056] As an optional embodiment, the cleaning mechanism is improved by adjusting the fixed push rod 45 to a movable design. Since the belt 63 is a rotating device controlled by a driving device connected to the wheel shaft 62, the belt 63 rotates on the pulley 61, and the first rod frame 64 rises to drive the push rod 45 to penetrate into the sieve holes of the sieve plate 25 to push out the plastic particles. At this time, the second rod frame 65 descends to drive the push rod 45 away from the sieve holes of the sieve plate 25, exposing the sieve holes on one side to be unobstructed. The plastic particles can be normally screened in the sieve holes in the unobstructed state, so that half of the sieve holes are in a cleaning state and the other half of the sieve holes are in an unobstructed state. This can solve the problem of screening stopping during the cleaning process and improve the screening efficiency.

[0057] As an optional embodiment, the first rod frame 64 and the second rod frame 65 are improved into a long strip structure, on which a number of top rods 45 matching the sieve plate 25 are installed at intervals. The top rods 45 on the same rod frame can be driven to extend upward or retract downward at the same time, so as to facilitate the control of the cleaning use of the top rods 45.

[0058] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. A screening device for recycled plastic particles, characterized in that: The screening machine (1) comprises a screening machine (1), wherein the top of the screening machine (1) is provided with a feeding end (11) for feeding materials, the bottom is provided with a discharging end (12) for discharging materials, and an openable material taking door (13) is installed at intervals on the side wall; The sieve plate mechanism is arranged in sequence along the plastic particle transmission direction, and comprises a vibration part and a sieve plate part arranged outside and inside the screening machine (1); the sieve plate part comprises a sieve plate frame (24) and a sieve plate (25); and sieve holes are provided on the sieve plate (25); The flap mechanism comprises a flap (34) arranged on one side of the sieve plate (25), and the flap (34) is controlled by the direction adjustment part to rotate along the clamping gap between the sieve plate (25) and the screening machine (1); The cleaning mechanism comprises a support plate (44) arranged below the sieve plate (25); a push rod (45) matching the sieve hole is mounted on the support plate (44) and is controlled by a push of a push-out structure to move closer to or farther from the sieve plate (25); The rod adjustment mechanism comprises a pulley (61) arranged on the support plate (44); the pulley (61) is connected to an external driving device via a wheel shaft (62); a rotatable belt (63) is mounted on the wheel shaft (62); a first rod frame (64) and a second rod frame (65) are mounted on opposite sides of the belt (63); a top rod (45) is mounted on the first rod frame (64) and the second rod frame (65), respectively; the first rod frame (64) and the second rod frame (65) have the same displacement distance and opposite displacement directions.

2. A screening device for recycled plastic particles according to claim 1, characterized in that: At least two groups of sieve plate mechanisms are arranged along the plastic particle transmission direction, and the number of sieve holes of each sieve plate (25) in the transmission direction increases sequentially.

3. A screening device for recycled plastic particles according to claim 2, characterized in that: The sieve plate (25) is adapted to the specifications of the adjacent push rod (45).

4. A screening device for recycled plastic particles according to claim 1, characterized in that: The vibrating portion of the sieve plate mechanism comprises a vibrating frame (21) mounted on the outer wall of the screening machine (1), a vibrating motor (22) being mounted on the vibrating frame (21), an output end of the vibrating motor (22) being connected to a sieve plate frame (24) in the inner cavity of the screening machine (1) via a conducting rod (23), and the sieve plate frame (24) and the sieve plate (25) vibrate synchronously.

5. The screening device for recycled plastic particles according to claim 1, characterized in that: The adjustment part of the flap mechanism comprises a motor (31) and an axis frame (32) symmetrically mounted on the outer wall of the screening machine (1); an adjustment shaft (33) rotating along an axis hole of the axis frame (32) is mounted on the output end of the motor (31); the flap (34) is sleeved on the outer wall of the adjustment shaft (33); and the flap (34) is attached to the inner wall of the screening machine (1) in an initial state.

6. The screening device for recycled plastic particles according to claim 1, characterized in that: The top extension portion of the cleaning mechanism comprises a cylinder (41) mounted on the inner wall of the screening machine (1), a telescopic rod (42) movable up and down is mounted on the output end of the cylinder (41), the other end of the telescopic rod (42) is connected to an inclined support (43), and the top of the support (43) is connected to the support plate (44).

7. The screening device for recycled plastic particles according to claim 1, characterized in that: A plastic transmission gap is left between the support plate (44) and the sieve plate (25), and a plastic transmission gap is left between adjacent push rods (45); when the support plate (44) and the sieve plate (25) are attached, the push rods (45) penetrate the sieve holes opened on the sieve plate (25).

8. The screening device for recycled plastic particles according to claim 1, characterized in that: The first rod frame (64) and the second rod frame (65) are long strip structures, and a number of top rods (45) matching the number of the sieve plates (25) are installed at intervals on the long strips.

9. The screening device for recycled plastic particles according to claim 1, characterized in that: An air induction device (51) for air intake is installed at the bottom of the flap (34), and an air outlet grille (52) penetrating the upper surface of the flap (34) is installed at the output end of the air induction device (51), and air outlet slots are provided at intervals on the air outlet grille (52).

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