Screening device for plastic particle production

Abstract

The invention belongs to the technical field of plastic particle screening, and discloses a screening device for plastic particle production, which comprises a support, and further comprises a screening plate assembly mounted at the top of the support; the vibration assembly is mounted on the sieve plate assembly; and the discharging assembly is arranged on the support and used for feeding materials to the sieve plate assembly. According to the scheme, the motor is operated to drive the eccentric hammer to rotate, so that the material plate and the linear sieve plate generate vibration perpendicular to the extension line direction of the material plate and the linear sieve plate, and plastic particles above the linear sieve plate are subjected to reciprocating vibration screening perpendicular to the guide direction of the linear sieve plate so as to prolong the screening time; small plastic particles fall onto the material plate through the linear sieve plate, at the moment, the cam jacks up the material plate through the reduction gear box and the connecting frame, and the material plate and the linear sieve plate incline with the hinged position of the material plate and the base as the axis so that the guidance quality of the material plate and the linear sieve plate on screened plastic can be improved; and therefore, the screening efficiency of the plastic particles is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of plastic particle screening, in particular to a screening device for plastic particle production. Background Art

[0002] In the plastic processing industry, plastic particles are the basic raw materials for the production of plastic products. Plastic particles are usually made by cutting strips of plastic extruded from a mixer or internal mixer through a granulator. During the injection molding process, if the particle size difference of the plastic particles is too large, the flow characteristics of the plastic melt in the mold cavity will be unstable, causing problems such as dimensional deviation and surface defects in the molded products. Therefore, after the granulation is completed, it is usually necessary to screen the plastic particles of different particle sizes through a particle screening machine. At present, linear screening machines are also commonly used for the screening of plastic particles. They are screened by setting multiple groups of sieve plates in the vertical direction and driving the sieve plates to vibrate through a vibration motor at the bottom of the screening machine. However, this vibration mode can easily cause the plastic particles to move too fast along the sieve plate, which can easily cause the plastic particles in the upper layer with a smaller particle size to be unable to be effectively screened out, thereby reducing the screening efficiency of the device. Therefore, in order to solve the above problems, a screening device for plastic particle production is proposed. Summary of the invention

[0003] In order to solve the problems raised in the above background technology, the present invention provides a screening device for plastic particle production, which solves the problem that some plastic particles cannot be effectively screened due to excessively fast feeding during vibration of the existing linear screening machine.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A screening device for producing plastic particles, comprising a support, and further comprising: a screen plate assembly, which is installed on the top of the support; a vibration assembly, which is installed on the screen plate assembly; a material discharge assembly, which is arranged on the support and is used to feed materials to the screen plate assembly;

[0005] The screen plate assembly includes a base fixed to the top of the support, a material plate is hinged at one end of the top of the base, a group of pillars for supporting the bottom of the material plate are symmetrically fixed to the other end of the top of the base, two groups of spring damping rods 2 are symmetrically fixed at the top edge of the material plate, a linear screen plate located above the material plate is fixed to the top of the spring damping rods 2, and a material port 2 and a discharge port 1 are respectively provided at the ends of the linear screen plate and the material plate.

[0006] Preferably, the vibration assembly comprises a connecting frame fixed to the bottom of the material plate, a group of motors are symmetrically fixed to the connecting frame, and an eccentric weight is fixed to the output shaft end of the motor;

[0007] A reduction gear box is fixedly connected to the middle of the connecting frame, and a cam is fixedly connected to the output end of the reduction gear box. A synchronous belt is also installed on the output shaft of the motor, and the output shaft of the motor is transmission-connected to the input end of the reduction gear box through the synchronous belt.

[0008] When the cam rotates, the raised portion thereof can abut against the upper surface of the base.

[0009] Preferably, two groups of spring damping rods 1 are symmetrically arranged on the top of the support, and the bottom of the base is fixedly connected to the top of the support through the spring damping rods 1.

[0010] Preferably, the output shaft direction of the motor is perpendicular to the output shaft direction of the reduction gear box;

[0011] The rotation direction of the eccentric weight is perpendicular to the extension direction of the material plate.

[0012] Preferably, the support column is divided into a rod body portion and a rubber pad portion at the top end;

[0013] The top of the support rod body part has magnetic energy for attracting the bottom surface of the material plate, and the rubber pad part of the support is in contact with the bottom of the material plate.

[0014] Preferably, baffles are fixedly connected equidistantly to the top of the linear sieve plate, the baffles are inclined and a gap is left between the bottom and the plate surface of the linear sieve plate, and the gaps between several baffles and the linear sieve plate in a direction from the support to the discharge port decrease successively.

[0015] Preferably, a group of symmetrical frames 1 are provided at one end of the top of the support away from the unloading assembly, and a bellows is fixedly connected to the top of the frame 1. The tops of the two groups of bellows are fixedly connected to the discharge port 1 and the discharge port 2 respectively.

[0016] Preferably, the material unloading assembly comprises a bracket fixedly connected to the top of the support, a storage hopper located above the linear screen plate is fixedly connected to the top of the bracket, a block is movably connected to the bottom of the storage hopper, and the block is used to block the bottom of the storage hopper in the initial state, and straight slots are symmetrically provided at both ends of the storage hopper, and a limiting cross bar that can slide in the straight slots is fixedly connected to both ends of the block, and the limiting cross bar extends to the outside of the storage hopper, and the cross section of the limiting cross bar has a group of left-right symmetrical vertical surfaces and is in contact with the inner wall of the straight slot;

[0017] A group of vertical rods located below the limiting cross bar are symmetrically fixed on the material plate, and an oblique rod is fixed on the top of the vertical rod. When the oblique rod rotates upward with the material plate, it can squeeze the limiting cross bar upward;

[0018] When both ends of the limit cross bar move upward or downward, they can isolate the storage hopper cavity from being connected to the outside through the straight slot.

[0019] Preferably, the material discharge assembly further comprises spring combination push rods symmetrically and elastically connected to both ends of the outside of the storage hopper;

[0020] In the initial state, the bottom end of the spring combination push rod is in contact with the limit cross bar due to its own elastic force.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The above scheme drives the eccentric hammer to rotate by running the motor, so that the material plate and the linear screen plate vibrate perpendicular to the direction of their own extension lines, so that the plastic particles above the linear screen plate are subjected to reciprocating vibration screening perpendicular to the guide direction of the linear screen plate to improve the screening time, and make smaller plastic particles fall onto the material plate through the linear screen plate. When the motor is running, it also drives the cam to rotate through the synchronous belt and the reduction gear box. During the rotation of the cam, the raised part of the cam will abut against the bottom of the base. At this time, the cam will lift the material plate through the reduction gear box and the connecting frame, and make the material plate and the linear screen plate tilt with the hinge between the material plate and the base as the axis to improve the guiding property of the material plate and the linear screen plate for the screened plastic, thereby achieving the screening efficiency of the plastic particles.

[0023] In the above scheme, when the material plate and the linear screen plate rotate, the screened plastic particles above the two will be discharged through the discharge port 1 and the material port 2 respectively. By arranging bellows at the bottom of the two and fixing the bellows to the support through the frame 1, it is ensured that when the discharge port 1 and the material port 2 discharge the screened plastic particles, the discharge position will not deviate due to the inclination of the material plate and the linear screen plate;

[0024] The above scheme rotates the material plate so that one end of it will drive the vertical rod and the oblique rod upward, so that the oblique rod squeezes the limiting cross bar to drive the block upward inside the storage hopper, thereby connecting the bottom of the storage hopper with the outside world. At this time, the plastic particles inside the storage hopper can fall onto the top of the linear screen plate through the gap between the bottom of the storage hopper and the block. When the material plate and the linear screen plate are reset, the limiting cross bar will be driven by the flowing plastic particles inside the storage hopper and the bottom of the storage hopper will be blocked under the action of the spring combination top rod supporting the limiting cross bar downward, thereby realizing intermittent feeding of unscreened plastic particles to avoid accumulation and improve the screening effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0027] Figure 3 It is a front plan view of the present invention;

[0028] Figure 4 It is a structural schematic diagram of the sieve plate assembly of the present invention;

[0029] Figure 5 for Figure 4 The enlarged view of point B in the middle;

[0030] Figure 6 It is a schematic diagram of the structure of the vibration component of the present invention;

[0031] Figure 7 It is a structural schematic diagram of the support assembly of the present invention;

[0032] Figure 8 It is a schematic diagram of the front cross-sectional structure of the storage hopper of the present invention.

[0033] In the figure: 1. support; 11. spring damping rod 1; 12. frame 1; 13. bellows; 2. sieve plate assembly; 21. base; 22. material plate; 221. discharge port 1; 222. vertical rod; 223. oblique rod; 23. pillar; 24. linear sieve plate; 241. discharge port 2; 242. baffle; 25. spring damping rod 2; 3. vibration assembly; 31. connecting frame; 311. reduction gear box; 312. cam; 32. motor; 321. synchronous belt; 33. eccentric hammer; 4. unloading assembly; 41. bracket; 42. storage hopper; 421. straight slot; 43. block; 44. limit cross bar; 45. spring combination top rod. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] like Figures 1 to 8 As shown, the present invention provides a screening device for plastic granule production, comprising a support 1, and further comprising: a screen plate assembly 2, which is installed on the top of the support 1; a vibration assembly 3, which is installed on the screen plate assembly 2; a material discharge assembly 4, which is arranged on the support 1 and is used to feed material to the screen plate assembly 2;

[0036] The screen plate assembly 2 includes a base 21 fixed to the top of the support 1, a material plate 22 is hinged at one end of the top of the base 21, a group of pillars 23 for supporting the bottom of the material plate 22 are symmetrically fixed at the other end of the top of the base 21, two groups of spring damping rods 25 are symmetrically fixed at the top edge of the material plate 22, a linear screen plate 24 located above the material plate 22 is fixed at the top of the spring damping rods 25, and a material port 241 and a discharge port 1 221 are respectively provided at the ends of the linear screen plate 24 and the material plate 22;

[0037] The vibration assembly 3 includes a connecting frame 31 fixed to the bottom of the material plate 22, a group of motors 32 are symmetrically fixed to the connecting frame 31, and an eccentric weight 33 is fixed to the output shaft end of the motor 32;

[0038] A reduction gear box 311 is fixedly connected to the middle of the connecting frame 31, and a cam 312 is fixedly connected to the output end of the reduction gear box 311. A synchronous belt 321 is also installed on the output shaft of the motor 32, and the output shaft of the motor 32 is transmission-connected to the input end of the reduction gear box 311 through the synchronous belt 321;

[0039] When the cam 312 rotates, its raised portion can abut against the upper surface of the base 21;

[0040] Two sets of spring damping rods 11 are symmetrically arranged on the top of the support 1, and the bottom of the base 21 is fixedly connected to the top of the support 1 through the spring damping rods 11;

[0041] The output shaft direction of the motor 32 is perpendicular to the output shaft direction of the reduction gear box 311 ; the rotation direction of the eccentric weight 33 is perpendicular to the extension direction of the material plate 22 .

[0042] By adopting the above scheme, the eccentric hammer 33 is driven to rotate by running the motor 32, so that the material plate 22 and the linear screen plate 24 generate vibrations perpendicular to the direction of their own extension lines, so that the plastic particles above the linear screen plate 24 are subjected to reciprocating vibration screening perpendicular to the guide direction of the linear screen plate 24 to improve the screening time, and make smaller plastic particles fall onto the material plate 22 through the linear screen plate 24. When the motor 32 is running, the cam 312 is also driven to rotate through the synchronous belt 321 and the reduction gear box 311. During the rotation of the cam 312, the raised part thereof will abut against the bottom of the base 21. At this time, the cam 312 will lift the material plate 22 through the reduction gear box 311 and the connecting frame 31, and make the material plate 22 and the linear screen plate 24 tilt with the hinge between the material plate 22 and the base 21 as the axis to improve the guiding property of the material plate 22 and the linear screen plate 24 for the screened plastic, thereby achieving the screening efficiency of the plastic particles.

[0043] It is worth noting that by using a spring damping rod 11 to connect the support 1 and the base 21, the influence of the vibration generated by the vibration component 3 on the support 1 can be effectively reduced.

[0044] like Figure 1 , Figure 3 and Figure 4 As shown, the support 23 is divided into a rod body part and a rubber pad part at the top; the top of the rod body part of the support 23 has magnetic properties for attracting the bottom surface of the material plate 22, and the rubber pad part of the support 23 is in contact with the bottom of the material plate 22;

[0045] By adopting the above solution, the rubber pad can reduce the impact and scratching between the material plate 22 and the base 21;

[0046] At the same time, since the top of the rod part of the support 23 is magnetic, it attracts the bottom of the sheet 22, preventing the sheet 22 from shaking up and down before it rotates, causing the sheet 22 to collide with the top of the support 23 and be damaged.

[0047] like Figure 1-Figure 4 As shown, baffles 242 are fixedly connected to the top of the linear sieve plate 24 at equal distances, the baffles 242 are arranged obliquely, and a gap is left between the bottom and the plate surface of the linear sieve plate 24, and the gaps between the baffles 242 and the linear sieve plate 24 in the direction from the support 23 to the discharge port 221 are reduced in sequence;

[0048] By adopting the above solution, the design of the baffle 242 can effectively avoid the accumulation of a large amount of plastic particles on the linear screen plate 24, thereby improving the screening effect of the linear screen plate 24 on the plastic particles.

[0049] like Figure 1 , Figure 3 and Figure 7 As shown, a symmetrical frame 12 is provided at one end of the top of the support 1 away from the material discharge assembly 4, and a bellows 13 is fixedly connected to the top of the frame 12. The tops of the two sets of bellows 13 are fixedly connected to the discharge port 1 221 and the discharge port 2 241 respectively;

[0050] By adopting the above scheme, when the material plate 22 and the linear screen plate 24 rotate, the screened plastic particles above the two will be discharged through the discharge port 1 221 and the material port 2 241 respectively. By arranging the bellows 13 at the bottom of the two and fixing the bellows 13 to the support 1 through the frame 12, it is ensured that when the discharge port 1 221 and the material port 241 discharge the screened plastic particles, the discharge position will not deviate due to the tilt of the material plate 22 and the linear screen plate 24.

[0051] like Figure 1-Figure 3 and Figure 8 As shown, the material discharge assembly 4 includes a bracket 41 fixed to the top of the support 1, a storage hopper 42 located above the linear screen plate 24 is fixed to the top of the bracket 41, a stopper 43 is movably connected to the bottom of the storage hopper 42, and the stopper 43 is used to block the bottom of the storage hopper 42 in the initial state, and straight slots 421 are symmetrically opened at both ends of the storage hopper 42, and a limiting cross bar 44 that can slide in the straight slot 421 is fixed to both ends of the stopper 43, and the limiting cross bar 44 extends to the outside of the storage hopper 42, and the cross section of the limiting cross bar 44 has a group of left-right symmetrical vertical surfaces and is in contact with the inner wall of the straight slot 421;

[0052] A set of vertical rods 222 located below the limiting cross bar 44 are symmetrically fixed to the material plate 22, and an inclined rod 223 is fixed to the top of the vertical rod 222. When the inclined rod 223 rotates upward with the material plate 22, it can squeeze the limiting cross bar 44 upward;

[0053] When both ends of the limit cross bar 44 move upward or downward, they can isolate the cavity of the storage hopper 42 from the outside through the straight slot 421;

[0054] The material discharge assembly 4 further includes a spring combination push rod 45 symmetrically and elastically connected to both ends of the outside of the storage hopper 42; in the initial state, the bottom end of the spring combination push rod 45 abuts against the limit cross bar 44 under the action of its own elastic force;

[0055] By adopting the above scheme, the material plate 22 is rotated so that one end of it will drive the vertical rod 222 and the inclined rod 223 to move upward, so that the inclined rod 223 squeezes the limiting cross bar 44 to drive the block 43 to move upward inside the storage hopper 42, so that the bottom of the storage hopper 42 is connected with the outside world. At this time, the plastic particles inside the storage hopper 42 can fall onto the top of the linear screen plate 24 through the gap between the bottom of the storage hopper 42 and the block 43. When the material plate 22 and the linear screen plate 24 are reset, the limiting cross bar 44 will be driven by the flowing plastic particles inside the storage hopper 42 and the bottom of the storage hopper 42 will be blocked under the action of the spring combination top rod 45 on the limiting cross bar 44 to support it downward, thereby realizing intermittent feeding of unscreened plastic particles to avoid accumulation and improve the screening effect.

[0056] The working principle and use process of the present invention:

[0057] The eccentric hammer 33 is driven to rotate by running the motor 32, and the material plate 22 and the linear screen plate 24 are vibrated perpendicularly to the direction of their own extension lines, so that the plastic particles above the linear screen plate 24 are subjected to reciprocating vibration screening perpendicular to the guide direction of the linear screen plate 24 to improve the screening time, and smaller plastic particles are allowed to fall onto the material plate 22 through the linear screen plate 24. At the same time, when the motor 32 is running, the cam 312 is driven to rotate through the synchronous belt 321 and the reduction gear box 311. During the rotation of the cam 312, the raised part thereof abuts against the bottom of the base 21. At this time, the cam 312 lifts the material plate 22 through the reduction gear box 311 and the connecting frame 31, and the material plate 22 and the linear screen plate 24 are tilted with the hinge between the material plate 22 and the base 21 as the axis to improve the guiding property of the material plate 22 and the linear screen plate 24 for the screened plastic.

[0058] When the material plate 22 and the linear screen plate 24 rotate, the screened plastic particles above the two will be discharged through the discharge port 1 221 and the discharge port 2 241 respectively. By arranging the bellows 13 at the bottom of the two and fixing the bellows 13 to the support 1 through the frame 1 12, it is ensured that the discharge port 1 221 and the discharge port 2 241 will not be tilted with the material plate 22 and the linear screen plate 24 when discharging the screened plastic particles, causing the discharge position to deviate;

[0059] When the material plate 22 rotates, one end thereof will drive the vertical rod 222 and the oblique rod 223 upward, and the oblique rod 223 will squeeze the limiting cross bar 44 to drive the stopper 43 upward inside the storage hopper 42, so that the bottom of the storage hopper 42 is connected with the outside world. At this time, the plastic particles inside the storage hopper 42 can pass through the gap between the bottom of the storage hopper 42 and the stopper 43 and fall onto the top of the linear sieve plate 24. When the material plate 22 and the linear sieve plate 24 are reset, the limiting cross bar 44 will be driven by the flowing plastic particles inside the storage hopper 42 and the bottom of the storage hopper 42 will be blocked under the action of the spring combination top rod 45 on the limiting cross bar 44 to push downward.

[0060] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0061] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A screening device for producing plastic particles, comprising a support (1), characterized in that: Also includes: A sieve plate assembly (2) mounted on the top of the support (1); A vibration assembly (3) mounted on the screen plate assembly (2); A material discharge assembly (4), which is arranged on the support (1) and is used for feeding materials to the screen plate assembly (2); The sieve plate assembly (2) comprises a base (21) fixedly connected to the top of the support (1); a material plate (22) is hingedly connected to one end of the top of the base (21); a group of pillars (23) for supporting the bottom of the material plate (22) are symmetrically fixedly connected to the other end of the top of the base (21); two groups of spring damping rods (25) are symmetrically fixedly connected to the top edge of the material plate (22); a linear sieve plate (24) located above the material plate (22) is fixedly connected to the top of the spring damping rods (25); and a material port (241) and a discharge port (221) are respectively provided at the ends of the linear sieve plate (24) and the material plate (22).

2. The screening device for plastic granule production according to claim 1, characterized in that: The vibration assembly (3) comprises a connecting frame (31) fixedly connected to the bottom of the material plate (22), a group of motors (32) are symmetrically fixedly connected to the connecting frame (31), and an eccentric weight (33) is fixedly connected to the output shaft end of the motor (32); A reduction gear box (311) is fixedly connected to the middle of the connecting frame (31), and a cam (312) is fixedly connected to the output end of the reduction gear box (311). A synchronous belt (321) is also installed on the output shaft of the motor (32), and the output shaft of the motor (32) is transmission-connected to the input end of the reduction gear box (311) through the synchronous belt (321); When the cam (312) rotates, its raised portion can abut against the upper surface of the base (21).

3. The screening device for producing plastic particles according to claim 2, characterized in that: Two groups of spring damping rods (11) are symmetrically arranged on the top of the support (1), and the bottom of the base (21) is fixedly connected to the top of the support (1) via the spring damping rods (11).

4. The screening device for producing plastic particles according to claim 3, characterized in that: The output shaft direction of the motor (32) is perpendicular to the output shaft direction of the reduction gear box (311); The rotation direction of the eccentric weight (33) is perpendicular to the extension direction of the material plate (22).

5. The screening device for producing plastic particles according to claim 4, characterized in that: The support column (23) is divided into a rod body portion and a rubber pad portion at the top end; The top of the rod body of the support (23) has magnetic properties for attracting the bottom surface of the material plate (22), and the rubber pad portion of the support (23) is in contact with the bottom of the material plate (22).

6. The screening device for plastic granule production according to claim 5, characterized in that: Baffles (242) are fixedly connected to the top of the linear sieve plate (24) at equal intervals. The baffles (242) are arranged in an inclined manner and a gap is left between the bottom end and the plate surface of the linear sieve plate (24). The gaps between the baffles (242) and the linear sieve plate (24) in a direction from the support (23) to the discharge port (221) are reduced in sequence.

7. The screening device for producing plastic particles according to claim 6, characterized in that: A group of symmetrical frames (12) are provided at one end of the top of the support (1) away from the unloading assembly (4), and a bellows (13) is fixedly connected to the top of the frame (12). The top ends of the two groups of bellows (13) are fixedly connected to the discharge port 1 (221) and the discharge port 2 (241), respectively.

8. The screening device for producing plastic particles according to claim 7, characterized in that: The material discharge assembly (4) comprises a bracket (41) fixedly connected to the top of the support (1); a storage hopper (42) located above the linear screen plate (24) is fixedly connected to the top of the bracket (41); a stopper (43) is movably connected to the bottom of the storage hopper (42); in an initial state, the stopper (43) is used to block the bottom of the storage hopper (42); straight slots (421) are symmetrically provided at both ends of the storage hopper (42); a limiting cross bar (44) capable of sliding in the straight slots (421) is fixedly connected to both ends of the stopper (43); the limiting cross bar (44) extends to the outside of the storage hopper (42); a cross section of the limiting cross bar (44) has a group of left-right symmetrical vertical surfaces and cooperates with the inner wall of the straight slot (421); A group of vertical rods (222) located below the limiting cross bar (44) are symmetrically fixed to the material plate (22), and an inclined rod (223) is fixed to the top of the vertical rod (222). When the inclined rod (223) rotates upward with the material plate (22), it can press the limiting cross bar (44) upward; When both ends of the limit cross bar (44) move upward or downward, they can isolate the storage hopper (42) cavity from being connected to the outside through the straight slot (421).

9. The screening device for producing plastic particles according to claim 8, characterized in that: The material discharge assembly (4) further comprises a spring combination push rod (45) symmetrically and elastically connected to two ends of the outside of the storage hopper (42); In the initial state, the bottom end of the spring combination push rod (45) is in contact with the limit cross rod (44) due to its own elastic force.

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