CN115285389B - Plastic grain filling machine - Google Patents

Abstract

The invention belongs to the field of plastic particle filling, and particularly relates to a plastic particle filling machine which comprises a support A, a screening mechanism and a bag supporting mechanism, wherein the screening mechanism arranged at the top end of the support A is provided with a structure for completely separating unsatisfactory eccentric long plastic particles from qualified plastic particles and a structure for filling the qualified plastic particles into nylon bags after accurate quantitative weighing. According to the screening mechanism disclosed by the invention, a switch valve for allowing the plastic particles to pass through the filling is omitted, the weighing cylinder at the lower end of the screening mechanism can drop the plastic particles with approximate weight onto the baffle C through the switch of the baffle A without considering the blocking problem of the plastic particles in the screening mechanism, the pressure sensor on the baffle C is used for weighing the plastic particles on the baffle C, and the weight of the plastic particles on the baffle C is accurately regulated through the switch of the baffle B, so that the purpose of accurately and quantitatively filling the plastic particles into the nylon bag below is realized.

Description

Plastic grain filling machine

Technical Field

The invention belongs to the field of plastic particle filling, and particularly relates to a plastic particle filling machine.

Background

The plastic particles refer to granular plastic, and in daily life, the regenerated particles can be used for manufacturing various plastic bags, barrels, basins, toys, furniture, stationery and other living appliances and various plastic products. The produced plastic particles are in a fine cylindrical shape and are required to be filled and packaged.

Most of the composite materials of the finished products of the plastic particles with inconsistent lengths are required, but a small part of the plastic particles with longer lengths mixed in the composite materials are disqualified products, and the plastic particles are required to be screened and removed by a screening machine. In the process of screening the plastic particles with the longer length by using the screening machine, the plastic particles with the longer length screened by the screen mesh can splash back into the qualified plastic particles on the screen mesh due to vibration, so that the efficiency of screening unqualified products by the screen mesh and the overall qualification rate of the plastic particles are reduced.

In the process of filling plastic particles into packaging bags by using a filling machine after screening and finishing, the plastic particles often block tubular channels or screens and must be stopped for manual cleaning, so that the screening and filling efficiency is reduced. Meanwhile, in the filling process, plastic particles entering the packaging bag have certain residual temperature to be in a softened state, the plastic particles at the bottom of the packaging bag are likely to deform due to extrusion, the yield of finished products of the plastic particles is reduced, and the use requirement is not met.

In addition, in the process of pipe rotation of plastic particles, under the consideration of anti-blockage, the control precision of the opening and closing amplitude of the valve is low, so that the quantitative weighing of the plastic particles before entering the packaging bag is inaccurate.

The invention designs filling equipment suitable for plastic particles with different lengths to solve the problems.

Disclosure of Invention

In order to solve the defects in the prior art, the invention discloses a plastic grain filling machine which is realized by adopting the following technical scheme.

The plastic grain filling machine comprises a bracket A, a screening mechanism and a bag supporting mechanism, wherein the screening mechanism arranged at the top end of the bracket A is provided with a structure for completely separating unsatisfactory eccentric long plastic grains from qualified plastic grains and a structure for filling the qualified plastic grains into nylon bags after accurate quantitative weighing; the screening mechanism is also provided with a structure for preventing the plastic particles moving in the screening mechanism from blocking the screening mechanism; the bag opening mechanism can simultaneously place a plurality of nylon bags and simultaneously open the bag openings of each nylon bag, and after the screening mechanism fills qualified plastic particles in a certain amount into the nylon bags, the bag openings of the nylon bags are closed and the nylon bags are sealed by hot melting.

As a further improvement of the technology, the screening mechanism comprises a screening shell, an inclined part, a screening channel, a vertical part, a hopper and a material weighing cylinder, wherein the screening shell consists of a material feeding vertical part and an inclined part which only allows plastic particles to move obliquely downwards in a single-layer state; the inclined part is internally provided with a plurality of screening channels which allow plastic particles to move obliquely downwards in a single head-to-tail arrangement mode, and each screening channel only allows the disqualified plastic particles with the length to move obliquely downwards along the length direction; the bottom of the tail end of each screening channel is provided with a screening hole which only allows qualified plastic particles to fall off and does not influence the continuous inclined downward movement of the longer unqualified plastic particles, and the upper end of each screening channel is provided with a cone opening which enables the longer unqualified columnar plastic particles rolling downwards around the axis in the inclined part of the screening shell to slide into the screening channel obliquely downwards along the axis; a weighing cylinder for filling qualified plastic particles into the nylon bag below is arranged below the screening hole, and a structure for accurately and quantitatively weighing the entered plastic particles is arranged on the weighing cylinder; the screening shell is provided with a structure for drying and shaping plastic particles moving between the vertical part and the screening channel; the junction of the vertical part of the screening shell and the inclined part of the screening shell is provided with a structure for preventing the blocking of plastic particles at the junction; the top end of the vertical part of the screening shell is provided with a hopper, and the vertical part of the screening shell is internally provided with a structure for enabling plastic particles to transversely and uniformly fall from the hopper to the inclined part.

As a further improvement of the technology, hot air holes communicated with a hot air cavity on the inclined part are uniformly distributed on the inclined part of the screening shell and positioned at the top between the vertical part and the screening channel, and the hot air cavity is communicated with an air heating blowing device through a heat conducting pipe; a plurality of guide plates which enable plastic particles to transversely and uniformly enter the inclined part are arranged in the vertical part of the screening shell.

As a further improvement of the technology, a roller B is arranged at the top of the upper end of the inclined part of the screening shell, and the axis of the roller B is parallel to the width of the inclined part; the bottom of the upper end of the inclined part of the screening shell is provided with two rollers A which are distributed at intervals along the inclined downward direction and are parallel to the rollers B, and the two rollers A are provided with a conveying belt with the upper surface being flush with the inner bottom of the inclined part; the roller shaft on which the roller A is positioned is provided with a gear A, the roller shaft on which the roller B is positioned is provided with a gear C, the gear C is in transmission connection with the gear A through the gear B, and the gear A is meshed with a gear D arranged on an output shaft of an external motor of the screening shell.

As a further improvement of the technology, the distance between the roller B and the conveying belt is 1.15 times of the average diameter of the qualified plastic particles; the vertical spacing of the space in the inclined part of the screening shell is 1.5 times of the average diameter of the qualified plastic particles; the transverse width of the screening channel is 1.2 times of the average length of the qualified plastic particles, the maximum transverse width of the cone opening at the upper end of the screening channel is 1.5 times of the average length of the unqualified plastic particles, and the depth of the cone opening at the upper end of the screening channel is 0.5 times of the maximum transverse width of the cone opening.

As a further improvement of the technology, a baffle A which is used for switching the guide sleeve A and is driven by an electric push rod A is horizontally moved in a guide sleeve A of the side wall of the upper end of the weighing cylinder; a baffle C which is used for switching the weighing cylinder and is driven by a hydraulic cylinder is hinged in the lower end of the weighing cylinder through a horizontal swing shaft, and a pressure sensor for accurately and quantitatively weighing plastic particles falling on the baffle C is arranged on the baffle C; the side wall of the weighing barrel is provided with an adjusting opening for finely adjusting the weight of plastic particles on the baffle C, and the baffle B which is used for switching the baffle C and is driven by the electric push rod B and the guide barrel for guiding the plastic particles from the adjusting opening are vertically moved at the adjusting opening.

As a further improvement of the technology, two swing rods fixedly connected through a synchronizing shaft are symmetrically arranged at two ends of the swing shaft, a connecting rod is rotatably matched on the synchronizing shaft, and the other end of the connecting rod is hinged with a sliding rod which vertically slides in a guide sleeve B of the side wall of the weighing cylinder and is driven by a hydraulic rod.

As a further improvement of the technology, the bag supporting mechanism comprises a bracket B, wheels, a supporting plate, a sliding seat, an electric push rod C, an electric push rod D, a clamping plate, a bag supporting plate, a guide sleeve C, a heat sealing device and an electric push rod E, wherein the bracket B with the wheels is provided with a plurality of square grooves which are horizontally distributed along a straight line, and an inclined supporting plate which corresponds to the square grooves and is used for supporting a bottom to support a nylon bag is arranged below each square groove; two sliding seats which are synchronously driven by the same electric push rod C are arranged in each square groove in a sliding way in opposite directions or opposite directions, bag supporting plates which extend into the bag openings of the nylon bags on the corresponding supporting plates and support the bag openings of the nylon bags along with the opposite movement of the two sliding seats are arranged at the lower ends of the two sliding seats, and clamping plates which tightly support the bag opening ends of the nylon bags on the corresponding bag supporting plates under the drive of the two electric push rods D are arranged at the lower ends of the two sliding seats; the heat sealing device which is driven by the electric push rod E and clamps and seals the mouth of the nylon bag is arranged in the guide sleeve C at one side of the square groove along the direction perpendicular to the movement of the sliding seat.

As a further improvement of the technology, two racks are symmetrically arranged on two sliding seats in the square groove, and two racks positioned on the same side of the two sliding seats are simultaneously meshed with the gear E; a sliding seat in the square groove is driven by an electric push rod C arranged on a bracket B.

Compared with the traditional plastic particle filling equipment, the plastic particle filling equipment can realize the one-time effective separation of qualified plastic particles and overlength plastic particles through the screening channel in the screening mechanism and the screening holes at the bottom of the tail end of the screening channel, thereby improving the screening quality and efficiency of the plastic particles and further ensuring the qualification rate of the plastic particles finally filled into nylon bags.

The plastic particles are effectively dried and shaped by hot air entering the screening shell from the hot air cavity through the hot air holes in the moving process from the top end of the inclined part of the screening shell to the screening channel, so that the plastic particles are prevented from deforming due to extrusion after being filled into nylon bags, and the product qualification rate of the plastic particles is further improved.

According to the invention, the conveying belt and the roller B which are arranged at the junction of the vertical part and the inclined part of the screening shell can effectively prevent plastic particles entering the screening shell from a hopper from blocking between the vertical part and the inclined part of the screening shell, so that the manual cleaning process caused by blocking of the plastic particles in the screening shell is saved, and the efficiency is higher.

According to the screening mechanism disclosed by the invention, a switch valve for allowing the plastic particles to pass through the filling is omitted, the weighing cylinder at the lower end of the screening mechanism can drop the plastic particles with approximate weight onto the baffle C through the switch of the baffle A without considering the blocking problem of the plastic particles in the screening mechanism, the pressure sensor on the baffle C is used for weighing the plastic particles on the baffle C, and the weight of the plastic particles on the baffle C is accurately regulated through the switch of the baffle B, so that the purpose of accurately and quantitatively filling the plastic particles into the nylon bag below is realized.

The invention has simple structure and better use effect.

Drawings

FIG. 1 is a schematic illustration of the cooperation of a screening mechanism and a bag opening mechanism.

FIG. 2 is a schematic cross-sectional view of the combination of the screening mechanism and the bag opening mechanism.

Fig. 3 is a schematic view of a screening mechanism.

Fig. 4 is a schematic cross-sectional view of a screening channel in a screening housing ramp.

Fig. 5 is a schematic view of the structure on a weighing cylinder and its cross section.

Fig. 6 is a schematic cross-sectional view of the internal structure of the vertical section of the sieving housing.

Fig. 7 is a schematic cross-sectional view of the belt engaging roller B.

Fig. 8 is a schematic cross-sectional view of a sieving housing.

Fig. 9 is a schematic view of a weighing cartridge and its cross-section.

Fig. 10 is a schematic view of a bag opening mechanism.

FIG. 11 is a schematic cross-sectional view of the bag-opening mechanism mated with a nylon bag from two perspectives.

Fig. 12 is a schematic diagram of a motion synchronization structure of two carriages in the same square groove.

Fig. 13 is a schematic view of a stent B.

Reference numerals in the figures: 1. a bracket A; 2. a screening mechanism; 3. screening the shell; 4. a bevel portion; 5. a sieving passage; 6. screening holes; 7. a hot air hole; 9. a vertical portion; 10. a hopper; 11. a guide plate; 12. a roller A; 13. a transmission belt; 14. a gear A; 15. a gear B; 16. a gear C; 17. a roller B; 18. a gear D; 19. a motor; 20. a hot air chamber; 21. a heat conduction pipe; 22. weighing a charging barrel; 23. an adjustment port; 24. a guide sleeve A; 25. a guide cylinder; 26. a baffle A; 27. an electric push rod A; 28. a baffle B; 29. an electric push rod B; 30. a baffle C; 31. a pressure sensor; 32. a pendulum shaft; 33. swing rod; 34. a synchronizing shaft; 35. a connecting rod; 36. a slide bar; 37. guide sleeve B; 38. a hydraulic cylinder; 39. a receiving cylinder A; 40. a receiving cylinder B; 41. a bag supporting mechanism; 42. a bracket B; 43. a square groove; 44. a guide groove; 45. a wheel; 46. a bearing plate; 47. a slide; 48. a guide block; 49. a rack; 50. a gear E; 51. an electric push rod C; 52. an electric push rod D; 53. a clamping plate; 54. a bag supporting plate; 55. a guide sleeve C; 56. a heat sealing device; 57. an electric push rod E; 58. nylon bags.

Detailed Description

The drawings are schematic representations of the practice of the invention to facilitate understanding of the principles of operation of the structure. The specific product structure and the proportional size are determined according to the use environment and the conventional technology.

As shown in fig. 1 and 2, the device comprises a bracket A1, a screening mechanism 2 and a bag supporting mechanism 41, wherein the screening mechanism 2 arranged at the top end of the bracket A1 is provided with a structure for completely separating unsatisfactory long plastic particles from qualified plastic particles and a structure for filling the qualified plastic particles into a nylon bag 58 after precisely and quantitatively weighing the qualified plastic particles; the screening mechanism 2 is also provided with a structure for preventing the plastic particles moving in the screening mechanism from blocking the screening mechanism; the bag opening mechanism 41 which can simultaneously place a plurality of nylon bags 58 and simultaneously open the bag opening of each nylon bag 58 closes the bag opening of the nylon bag 58 and heat-seals the nylon bag 58 after the screening mechanism 2 fills qualified plastic particles in the nylon bags 58.

As shown in fig. 3 and 4, the screening mechanism 2 comprises a screening shell 3, a bevel part 4, a screening channel 5, a vertical part 9, a hopper 10 and a weighing cylinder 22, wherein, as shown in fig. 8, the screening shell 3 consists of a feeding vertical part 9 and a bevel part 4 which only allows plastic particles to move obliquely downwards in a single-layer state; as shown in fig. 4 and 8, the inclined part 4 is internally provided with a plurality of screening channels 5 which allow the plastic particles to move obliquely downwards in a single end-to-end arrangement manner, and each screening channel 5 only allows the disqualified plastic particles with the partial length to move obliquely downwards along the length direction; the bottom of the tail end of each screening channel 5 is provided with a screening hole 6 which only allows the qualified plastic particles to fall off and does not influence the longer unqualified plastic particles to continue to move obliquely downwards, and the upper end of each screening channel 5 is provided with a conical opening which enables the longer unqualified columnar plastic particles rolling downwards around the axis in the inclined part 4 of the screening shell 3 to slide into the screening channel 5 obliquely downwards along the axis; as shown in fig. 2, 3 and 5, a weighing cylinder 22 for filling qualified plastic particles into a nylon bag 58 below is arranged below the screening hole 6, and a structure for accurately and quantitatively weighing the entered plastic particles is arranged on the weighing cylinder 22; as shown in fig. 2, 3 and 8, the sieving shell 3 is provided with a structure for drying and shaping plastic particles moving between the vertical part 9 and the sieving channel 5; as shown in fig. 7, the junction between the vertical part 9 of the screening shell 3 and the inclined part 4 of the screening shell 3 is provided with a structure for preventing the plastic particles from being blocked at the junction; as shown in fig. 6 and 8, the top end of the vertical portion 9 of the sieving case 3 is provided with a hopper 10, and the vertical portion 9 of the sieving case 3 is internally provided with a structure for enabling plastic particles to be transversely and uniformly discharged from the hopper 10 to the inclined portion 4.

As shown in fig. 2, 3 and 8, the top of the inclined part 4 of the screening shell 3, which is positioned between the vertical part 9 and the screening channel 5, is uniformly provided with hot air holes 7 communicated with a hot air cavity 20 on the inclined part 4, and the hot air cavity 20 is communicated with an air heating blowing device through a heat conducting pipe 21; as shown in fig. 6, a plurality of guide plates 11 which enable plastic particles to transversely and uniformly enter the inclined part 4 are arranged in the vertical part 9 of the screening shell 3.

As shown in fig. 6 and 7, a roller B17 is mounted on the top of the upper end of the inclined part 4 of the screening shell 3, and the axis of the roller B17 is parallel to the width of the inclined part 4; the bottom of the upper end of the inclined part 4 of the screening shell 3 is provided with two rollers A12 which are distributed at intervals along the inclined downward direction and are parallel to the rollers B17, and the two rollers A12 are provided with a conveying belt 13 with the upper surface being level with the bottom of the inclined part 4; the roller shaft where the roller A12 is arranged is provided with a gear A14, the roller shaft where the roller B17 is arranged is provided with a gear C16, the gear C16 is in transmission connection with the gear A14 through a gear B15, and the gear A14 is meshed with a gear D18 arranged on the output shaft of a motor 19 outside the screening shell 3.

As shown in fig. 2, 4 and 7, the distance between the roller B17 and the conveyor belt 13 is 1.15 times the average diameter of the qualified plastic particles; the vertical space of the space in the inclined part 4 of the screening shell 3 is 1.5 times of the average diameter of the qualified plastic particles; the transverse width of the screening channel 5 is 1.2 times of the average length of the qualified plastic particles, the maximum transverse width of the cone opening at the upper end of the screening channel 5 is 1.5 times of the average length of the unqualified plastic particles, and the depth of the cone opening at the upper end of the screening channel 5 is 0.5 times of the maximum transverse width of the cone opening.

As shown in fig. 5 and 9, a baffle plate a26 which is opened and closed and driven by an electric push rod a27 is horizontally moved in a guide sleeve a24 of the side wall of the upper end of the weighing cylinder 22; a baffle C30 which is used for switching the weighing cylinder 22 and is driven by a hydraulic cylinder 38 is hinged in the lower end of the weighing cylinder 22 through a horizontal swinging shaft 32, and a pressure sensor 31 which is used for accurately and quantitatively weighing plastic particles falling on the baffle C30 is arranged on the baffle C30; the side wall of the weighing barrel 22 is provided with an adjusting opening 23 for finely adjusting the weight of plastic particles on a baffle C30, a baffle B28 which is vertically moved at the adjusting opening 23 and is driven by an electric push rod B29, and a guide barrel 25 for guiding the plastic particles from the adjusting opening 23.

As shown in fig. 5, two swing rods 33 are symmetrically installed at two ends of the swing shaft 32 and are fixedly connected through a synchronizing shaft 34, a connecting rod 35 is rotatably matched on the synchronizing shaft 34, and the other end of the connecting rod 35 is hinged with a sliding rod 36 which vertically slides in a guide sleeve B37 on the side wall of the weighing barrel 22 and is driven by a hydraulic rod.

As shown in fig. 10, the bag supporting mechanism 41 includes a bracket B42, wheels 45, a supporting plate 46, a sliding seat 47, an electric push rod C51, an electric push rod D52, a clamping plate 53, a bag supporting plate 54, a guide sleeve C55, a heat sealing device 56, and an electric push rod E57, wherein, as shown in fig. 11, 12 and 13, the bracket B42 with the wheels 45 is provided with a plurality of square grooves 43 distributed horizontally along a straight line, and an inclined supporting plate 46 corresponding to the square grooves 43 and used for supporting a nylon bag 58 is installed below each square groove 43; two sliding seats 47 which are synchronously driven by the same electric push rod C51 are arranged in each square groove 43 in a sliding way in opposite directions or opposite directions, bag supporting plates 54 which extend into the bag openings of the nylon bags 58 on the corresponding supporting plates 46 and support the bag openings of the nylon bags 58 along with the opposite movement of the two sliding seats 47 are arranged at the lower ends of the two sliding seats 47, and clamping plates 53 which tightly support the bag opening ends of the nylon bags 58 on the corresponding bag supporting plates 54 under the driving of the two electric push rods D52 are arranged at the lower ends of the two sliding seats 47; a heat sealing device 56 which is driven by an electric push rod E57 and clamps and seals the mouth of a nylon bag 58 is arranged in the guide sleeve C55 at one side of the square groove 43 along the direction perpendicular to the movement of the slide seat 47.

As shown in fig. 12, two racks 49 are symmetrically installed on two sliding seats 47 in the square groove 43, and two racks 49 positioned on the same side of the two sliding seats 47 are simultaneously meshed with a gear E50; one slide 47 in the square groove 43 is driven by an electric push rod C51 mounted on the bracket B42.

As shown in fig. 12 and 13, the slide 47 has two symmetrically distributed guide blocks 48, and the two guide blocks 48 slide in the two guide grooves 44 on the inner wall of the corresponding square groove 43.

In the present invention, the electric putter a27, the electric putter B29, the electric putter C51, the electric putter D52, and the electric putter E57 are all conventional technologies.

The hydraulic cylinder 38, the pressure sensor 31 and the motor 19 of the present invention are all of the prior art.

The working flow of the invention is as follows: in the initial state, the baffle A26 in the screening mechanism 2 is symmetrical to the charging barrel 22 in a closed state, the baffle B28 is in a closed state for the adjusting port 23, and the baffle C30 is symmetrical to the charging barrel 22 in an open state. The distance between the two sliding seats 47 in the bag supporting mechanism 41 is maximized, the heat sealing device 56 is positioned outside the corresponding square groove 43 without interfering with the installation of the nylon bag 58, and a gap is reserved between the clamping plate 53 and the corresponding bag supporting plate 54.

When the invention needs to be used for effectively separating unqualified and long plastic particles from plastic particles and quantitatively filling the plastic particles, all the electric push rods C51 in the bag supporting mechanism 41 are started, and the electric push rods C51 drive the corresponding two sliding seats 47 to move oppositely through the two racks 49 and the gear E50, so that the distance between the two bag supporting plates 54 in each square groove 43 is smaller than the size of the bag opening of the nylon bag 58, and the bag opening of the nylon bag 58 can be conveniently and smoothly nested on the two bag supporting plates 54. Then, nylon bags 58 are placed on each supporting plate 46, the bag opening of each nylon bag 58 is manually opened and is nested on the two bag opening plates 54 in the corresponding square groove 43, then, the electric push rods D52 on the sliding seats 47 in each square groove 43 are synchronously started, the four electric push rods D52 in each square groove 43 drive the corresponding two clamping plates 53 to clamp the parts, which are used for respectively nesting the bag openings of the nylon bags 58 on the bag opening plates 54, of the corresponding two sliding seats 47 to open and tightly support the bag openings of the corresponding nylon bags 58, and the electric push rods C51 on each square groove 43 are started to drive the corresponding two sliding seats 47 to move back to back.

The bag supporting mechanism 41 is pushed to the lower part of the weighing cylinder 22, so that the mouth of the nylon bag 58 is opposite to the weighing cylinder 22.

Then, hot air is blown into the inclined part 4 of the screening shell 3 through the heat-conducting pipe 21 and the hot air cavity 20, the motor 19 is started, the motor 19 drives the conveying belt 13 to run through the gear D18, the gear A14 and the roller A12, the gear A14 drives the roller B17 to rotate through the gear B15 and the gear C16, and the running direction of the roller B17 is opposite to that of the conveying belt 13. Meanwhile, the just-molded plastic particles are conveyed into the hopper 10 through the conveying equipment, and the plastic particles transversely and uniformly fall to the junction of the inclined part 4 and the vertical part 9 of the screening shell 3 through the guidance of the guide plates 11 in the vertical part 9 of the screening shell 3. The plastic particles reaching the inclined part 4 of the sieving shell 3 move to the lower end of the inclined part 4 under the conveying of the conveying belt 13, and meanwhile, the rotation of the roller B17 enables the plastic particles in the vertical state to incline, so that the plastic particles move into the inclined part 4 in a single-layer state. The plastic particles entering the inclined part 4 are automatically adjusted in the moving process and are quickly dried under the action of hot air fed from the top end of the inclined part 4, and the plastic particles sliding up and down along the axis of the plastic particles are automatically adjusted to be in a downward rolling state around the axis of the plastic particles in the moving process.

When the plastic particles reach the cone opening of the sieving channel 5, the qualified plastic particles can enter the sieving channel 5 in any state to move downwards continuously, and the unqualified long plastic particles can twist from a rolling state under the action of the side wall of the cone opening and finally enter the sieving channel 5 to slide downwards continuously along the length direction or positively or obliquely. When the qualified plastic particles reach the screening holes 6 at the tail end of the screening channel 5, the plastic particles automatically fall onto the baffle C30 through the screening holes 6. The pressure sensor 31 on the baffle C30 weighs the plastic particles falling to the baffle C30 at any time. When the pressure sensor 31 displays that the plastic particles on the baffle C30 reach the required weight, the electric push rod A27 is started to drive the baffle A26 to close the upper end of the symmetrical charging barrel 22 and prevent the plastic particles from continuously falling onto the baffle C30.

In the process of closing the baffle plate A26, a small amount of plastic particles still fall onto the baffle plate C30 to cause overweight of the plastic particles on the baffle plate C30, so after the symmetrical feed cylinder 22 of the baffle plate A26 is closed, the electric push rod B29 is started to drive the baffle plate B28 to slowly open a small gap to the regulating port 23, the plastic particles on the baffle plate C30 leak outwards through the gap of the slowly opened regulating port 23, and the leaked plastic particles enter the receiving cylinder A39 for centralized recovery by the guide cylinder 25.

When the weight of the plastic particles on the baffle C30 reaches the requirement, the electric push rod B29 is started immediately to drive the baffle B28 to close the adjusting port 23 quickly. Starting a hydraulic rod, and driving a baffle C30 to open at the lower end of the symmetrical charging barrel 22 by a hydraulic cylinder 38 through a slide bar 36, a connecting rod 35, a synchronizing shaft 34 and a swing rod 33, wherein quantitative plastic particles on the baffle C30 fall into a nylon bag 58 below along the inclined baffle C30. After the plastic particles on the baffle C30 completely enter the nylon bag 58, the hydraulic cylinder 38 is started to drive the baffle C30 to close the lower end of the symmetrical charging barrel 22, the electric push rod A27 is started to drive the baffle A26 to open the upper end of the symmetrical charging barrel 22 again, and the plastic particles accumulated on the baffle A26 continue to fall onto the baffle C30. At the same time, the bag support mechanism 41 is pushed to move one square groove 43 so that the next empty nylon bag 58 is positioned below the weighing cylinder 22.

When the weight of plastic particles on the baffle C30 is overweight, the electric push rod B29 is started to drive the baffle B28 to open the regulating port 23, so that the weight of the plastic particles on the baffle C30 can be accurately regulated.

The unqualified and long plastic particles moving in the screening channel 5 continue to move downwards beyond the screening holes 6 due to the large length and the unqualified and long plastic particles finally fall into the receiving cylinder B40 below the tail end of the screening shell 3, so that the unqualified and long plastic particles are effectively and completely separated and screened from the qualified plastic particles.

When the nylon bag 58 is filled with plastic particles, the empty nylon bag 58 is replaced under the charging barrel 22. At this time, the electric push rod C51 on the square groove 43 where the nylon bag 58 filled with plastic particles is located is started, and the electric push rod C51 drives the corresponding two sliding seats 47 to move in opposite directions and finally completes the closing of the mouth of the nylon bag 58. The electric push rod E57 is started, the electric push rod E57 drives the heat sealing device 56 to move from the side direction to the opening of the closed nylon bag 58 and finally form a clamping state for the opening of the closed nylon bag 58, the heat sealing device 56 is started, and the opening of the closed nylon bag 58 is sealed by the heat sealing device 56 in a heat capacity mode.

After the mouth of the nylon bag 58 is sealed by heat capacity, the electric push rod E57 is started to drive the heat sealing device 56 to reset and separate from the mouth of the nylon bag 58, the four electric push rods D52 on the two sliding seats 47 where the nylon bag 58 filled with plastic particles is positioned are started, and the electric push rods D52 drive the two clamping plates 53 to reset relative to the corresponding bag supporting plates 54 and release the clamping of the mouth of the nylon bag 58.

Then, the packaged nylon bags 58 are laterally removed from the corresponding supporting plates 46, new empty nylon bags 58 are prevented, and the opening and the tightening of the bag openings of the empty nylon bags 58 are completed.

In summary, the beneficial effects of the invention are as follows: the invention can realize the one-time effective separation of qualified plastic particles and overlength plastic particles through the screening channel 5 in the screening mechanism 2 and the screening hole 6 at the bottom of the tail end of the screening channel 5, thereby improving the screening quality and efficiency of the plastic particles and further ensuring the qualification rate of the plastic particles finally filled in the nylon bags 58.

The plastic particles are effectively dried and shaped by hot air entering the screening shell 3 from the hot air cavity 20 through the hot air holes 7 in the process of moving from the top end of the inclined part 4 of the screening shell 3 to the screening channel 5, so that the plastic particles are prevented from deforming due to extrusion after being filled into the nylon bags 58, and the product qualification rate of the plastic particles is further improved.

According to the invention, the conveying belt 13 and the roller B17 which are arranged at the junction of the vertical part 9 and the inclined part 4 of the screening shell 3 can effectively prevent plastic particles entering the screening shell 3 from the hopper 10 from blocking between the vertical part 9 and the inclined part 4 of the screening shell 3, so that the manual cleaning process caused by blocking of the plastic particles in the screening shell 3 is saved, and the efficiency is higher.

The screening mechanism 2 omits a switch valve which allows the plastic particles to pass through the filling process quantitatively, the weighing cylinder 22 at the lower end of the screening mechanism 2 can drop the plastic particles with approximate weight onto the baffle C30 through the switch of the baffle A26 without considering the blocking problem of the plastic particles in the screening mechanism 2, the pressure sensor 31 on the baffle C30 is used for weighing the plastic particles on the plastic particles, and the switch of the baffle B28 is used for accurately regulating the weight of the plastic particles on the baffle C30, so that the purpose of accurately and quantitatively filling the plastic particles into the nylon bags 58 below is realized.

Claims (7)

1. A plastic grain liquid filling machine, its characterized in that: the device comprises a bracket A, a screening mechanism and a bag supporting mechanism, wherein the screening mechanism arranged at the top end of the bracket A is provided with a structure for completely separating non-satisfactory eccentric plastic particles from qualified plastic particles and a structure for filling the qualified plastic particles into nylon bags after accurate quantitative weighing; the screening mechanism is also provided with a structure for preventing the plastic particles moving in the screening mechanism from blocking the screening mechanism; the bag opening mechanism can simultaneously place a plurality of nylon bags and simultaneously open the bag openings of each nylon bag, and after the screening mechanism fills qualified plastic particles in the nylon bags, the bag openings of the nylon bags are closed and the nylon bags are sealed by hot melting;

the screening mechanism comprises a screening shell, an inclined part, a screening channel, a vertical part, a hopper and a weighing cylinder, wherein the screening shell consists of a feeding vertical part and an inclined part which only allows plastic particles to move obliquely downwards in a single-layer state; the inclined part is internally provided with a plurality of screening channels which allow plastic particles to move obliquely downwards in a single head-to-tail arrangement mode, and each screening channel only allows the disqualified plastic particles with the length to move obliquely downwards along the length direction; the bottom of the tail end of each screening channel is provided with a screening hole which only allows qualified plastic particles to fall off and does not influence the continuous inclined downward movement of the longer unqualified plastic particles, and the upper end of each screening channel is provided with a cone opening which enables the longer unqualified columnar plastic particles rolling downwards around the axis in the inclined part of the screening shell to slide into the screening channel obliquely downwards along the axis; a weighing cylinder for filling qualified plastic particles into the nylon bag below is arranged below the screening hole, and a structure for accurately and quantitatively weighing the entered plastic particles is arranged on the weighing cylinder; the screening shell is provided with a structure for drying and shaping plastic particles moving between the vertical part and the screening channel; the junction of the vertical part of the screening shell and the inclined part of the screening shell is provided with a structure for preventing the blocking of plastic particles at the junction; the top end of the vertical part of the screening shell is provided with a hopper, and the vertical part of the screening shell is internally provided with a structure for enabling plastic particles to transversely and uniformly fall from the hopper to the inclined part;

the bag supporting mechanism comprises a bracket B, wheels, supporting plates, a sliding seat, an electric push rod C, an electric push rod D, clamping plates, a bag supporting plate, a guide sleeve C, a heat sealing device and an electric push rod E, wherein the bracket B with the wheels is provided with a plurality of square grooves which are horizontally distributed along a straight line, and an inclined supporting plate which corresponds to the square grooves and is used for supporting a bottom to support a nylon bag is arranged below each square groove; two sliding seats which are synchronously driven by the same electric push rod C are arranged in each square groove in a sliding way in opposite directions or opposite directions, bag supporting plates which extend into the bag openings of the nylon bags on the corresponding supporting plates and support the bag openings of the nylon bags along with the opposite movement of the two sliding seats are arranged at the lower ends of the two sliding seats, and clamping plates which tightly support the bag opening ends of the nylon bags on the corresponding bag supporting plates under the drive of the two electric push rods D are arranged at the lower ends of the two sliding seats; the heat sealing device which is driven by the electric push rod E and clamps and seals the mouth of the nylon bag is arranged in the guide sleeve C at one side of the square groove along the direction perpendicular to the movement of the sliding seat.

2. A plastic pellet filling machine as claimed in claim 1, wherein: the top of the screening shell inclined part, which is positioned between the vertical part and the screening channel, is uniformly provided with hot air holes communicated with a hot air cavity on the inclined part, and the hot air cavity is communicated with an air heating blowing device through a heat conducting pipe; a plurality of guide plates which enable plastic particles to transversely and uniformly enter the inclined part are arranged in the vertical part of the screening shell.

3. A plastic pellet filling machine as claimed in claim 1, wherein: a roller B is arranged at the top of the upper end of the inclined part of the screening shell, and the axis of the roller B is parallel to the width of the inclined part; the bottom of the upper end of the inclined part of the screening shell is provided with two rollers A which are distributed at intervals along the inclined downward direction and are parallel to the rollers B, and the two rollers A are provided with a conveying belt with the upper surface being flush with the inner bottom of the inclined part; the roller shaft on which the roller A is positioned is provided with a gear A, the roller shaft on which the roller B is positioned is provided with a gear C, the gear C is in transmission connection with the gear A through the gear B, and the gear A is meshed with a gear D arranged on an output shaft of an external motor of the screening shell.

4. A plastic pellet filling machine as claimed in claim 3, wherein: the distance between the roller B and the conveying belt is 1.15 times of the average diameter of the qualified plastic particles; the vertical spacing of the space in the inclined part of the screening shell is 1.5 times of the average diameter of the qualified plastic particles; the transverse width of the screening channel is 1.2 times of the average length of the qualified plastic particles, the maximum transverse width of the cone opening at the upper end of the screening channel is 1.5 times of the average length of the unqualified plastic particles, and the depth of the cone opening at the upper end of the screening channel is 0.5 times of the maximum transverse width of the cone opening.

5. A plastic pellet filling machine as claimed in claim 1, wherein: a baffle A which is used for switching the guide sleeve A and is driven by an electric push rod A is horizontally moved in the guide sleeve A on the side wall of the upper end of the weighing cylinder; a baffle C which is used for switching the weighing cylinder and is driven by a hydraulic cylinder is hinged in the lower end of the weighing cylinder through a horizontal swing shaft, and a pressure sensor for accurately and quantitatively weighing plastic particles falling on the baffle C is arranged on the baffle C; the side wall of the weighing barrel is provided with an adjusting opening for finely adjusting the weight of plastic particles on the baffle C, and the baffle B which is used for switching the baffle C and is driven by the electric push rod B and the guide barrel for guiding the plastic particles from the adjusting opening are vertically moved at the adjusting opening.

6. The plastic pellet filling machine according to claim 5, wherein: two swing rods fixedly connected through a synchronous shaft are symmetrically arranged at two ends of the swing shaft, a connecting rod is rotatably matched on the synchronous shaft, and the other end of the connecting rod is hinged with a sliding rod which vertically slides in a guide sleeve B on the side wall of the weighing cylinder and is driven by a hydraulic rod.

7. A plastic pellet filling machine as claimed in claim 1, wherein: two racks are symmetrically arranged on two sliding seats in the square groove, and the two racks positioned on the same side of the two sliding seats are meshed with the gear E at the same time; a sliding seat in the square groove is driven by an electric push rod C arranged on a bracket B.

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