Granular hot melt adhesive discharging screening device and method

Abstract

The present invention relates to the technical field of hot melt adhesive screening, and discloses a granular hot melt adhesive discharging and screening device and method, comprising a device box, a transmission mechanism, a plurality of cutting barrels, and a central axis. A screening barrel is arranged in the device box. The granular hot melt adhesive discharging and screening device and method, a motor drives a screw rod to rotate, and with the cooperation of the screw rod, the transmission mechanism and the screening barrel, the screening barrel is driven to rotate and screen. The screened material enters a return material mechanism, enters a return material box through the return material mechanism, falls on a first screening net for secondary screening, and materials of qualified size fall into a first collecting box and are transported through a lifting pipe and a rotating screw rod. Materials of qualified size will be lifted into a second collecting box and discharged through a discharging channel, while materials larger than the qualified size will enter a cutting barrel for cutting processing, and will be processed into materials of qualified size.

Description

Technical Field

[0001] The invention relates to the technical field of hot melt adhesive screening, and in particular to a device and method for screening granular hot melt adhesive discharge. Background Art

[0002] In the early stage of hot melt adhesive production, various raw materials (such as basic resin, tackifier, viscosity modifier, antioxidant, etc.) will be precisely proportioned and mixed. The mixed raw materials will be sent to the extruder, and through the action of heating and extrusion die, continuous rubber strips or rubber lines will be formed, but the extruded rubber strips or rubber lines that have not yet reached the required particle size will quickly pass through the cooling device to quickly cool and solidify them. The cooled and solidified rubber strips or rubber lines will be sent to the pelletizer to be cut into particles, and then the pelletized hot melt adhesive particles need to be further graded and screened by the screening device. This step helps to remove particles that do not meet the requirements (such as particles that are too large or too small), thereby improving the uniformity of the particles.

[0003] Some screening devices currently on the market: for example, the utility model patent with authorization announcement number CN206464225U discloses a rotary screening device, which can screen materials into three different granular forms by setting a primary screening cylinder and a secondary screening cylinder with different mesh aperture sizes. However, when the device is in use, it can only screen the materials. During the screening process, it is impossible to process the materials of unqualified sizes to increase the number of qualified sized materials. On the other hand, when the device is exporting materials, it is necessary to stop the motor and operate the third solenoid valve, the second solenoid valve and the first solenoid valve through the buttons on the control panel, and then export the materials separately. This discharging method is more troublesome and requires shutdown, which greatly affects the production efficiency.

[0004] Therefore, we propose a granular hot melt adhesive discharging screening device and method to solve the above-mentioned problems. Summary of the invention

[0005] The purpose of the present invention is to solve the problems of some current screening devices. When the device is in use, it can only screen materials. During the screening process, it is impossible to process materials of unqualified sizes to increase the number of materials of qualified sizes. On the other hand, when the device is exporting materials, it is necessary to stop the motor and operate the third solenoid valve, the second solenoid valve, and the first solenoid valve through the buttons on the control panel, and then export the materials respectively. This discharge method is more troublesome and the machine needs to be shut down during discharge, which greatly affects the production efficiency.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a granular hot melt adhesive discharging and screening device and method, comprising: a device box, a screening cylinder is arranged in the device box, and a discharge pipe is arranged at the bottom of the device box, a support frame is arranged at the top of the device box, a motor and a feeding pipe are arranged on the support frame, a spiral rod connected to the motor is arranged in the feeding pipe, a return box is arranged on the screening cylinder, the bottom end of the feeding pipe is located in the return box, and a first collecting box is arranged at the bottom end of the feeding pipe, a first screening net is arranged between the top of the first collecting box and the feeding pipe, and a mechanism box is arranged at the bottom of the first collecting box;

[0007] A transmission mechanism is arranged in the mechanism box, and the transmission mechanism is connected to the screw rod;

[0008] A plurality of cutting cylinders are arranged in the screening cylinder and are connected to the material return box, wherein a rotating shaft is arranged on the cutting cylinder, and a large bevel gear is arranged at one end of the rotating shaft;

[0009] A central shaft is fixed in the screening drum, the central shaft is connected to the transmission mechanism, and a small bevel gear meshing with the large bevel gear is arranged on the central shaft;

[0010] A material return mechanism is provided between the screening cylinder and the material return box, and a material feed channel is provided on the screening cylinder, and a material feed bin is provided on the material feed channel;

[0011] A driving mechanism is arranged on the supporting frame, and the driving mechanism is used to drive the material returning mechanism;

[0012] The lifting pipe is provided with a second material collecting box, and the side of the second material collecting box is provided with a material discharging channel.

[0013] Further, the screening drum comprises an upper drum cover, a lower drum cover, and a rotating ring, the lower surface of the upper drum cover is connected to a fixing ring, and a fixing column is connected between the lower surface of the upper drum cover and a device box, a second screening net is arranged between the rotating ring and the lower drum cover, and a plurality of evenly distributed connecting rods are fixed between the rotating ring and the lower drum cover, the connecting rods are located at the outside of the second screening net, a first annular limiting plate is connected to the lower surface of the fixing ring, a first limiting groove slidably connected to the first annular limiting plate is provided on the rotating ring, a second annular limiting plate is connected to the side of the rotating ring, an adapting hole matched with the rotating ring is provided on the device box, a second limiting groove slidably connected to the second annular limiting plate is provided on the inner wall of the adapting hole, one end of the return material mechanism is connected with the fixing ring, and the other end of the return material mechanism is connected with the return material box.

[0014] Furthermore, the transmission mechanism includes two first gears, a connecting shaft, and a large gear and a small gear. The connecting shaft is rotatably connected in the mechanism box, and the two first gears are respectively sleeved on the bottom end of the spiral rod and the connecting shaft, and the two first gears are meshed with each other. The large gear is sleeved on the connecting shaft, and the small gear is sleeved on the central shaft, and the large gear and the small gear are meshed with each other.

[0015] Furthermore, the cutting barrel includes two side plates, a partition plate is connected between the two side plates, and a rotating drum is arranged between the two side plates, the rotating drum is sleeved on the rotating shaft, the side plates and the partition plate constitute a material discharge channel, a plurality of evenly distributed material grooves are provided on the rotating drum, an arc-shaped material limiting plate and an arc-shaped cutting knife are connected between the two side plates, a compression groove is provided at the bottom end of the partition plate close to the arc-shaped material limiting plate, a baffle is arranged in the compression groove, a compression spring is arranged between the baffle plate and the top wall of the compression groove, and the side surface of the baffle plate is arranged as an arc-shaped structure, and the side surfaces of the two side plates are connected to connecting columns.

[0016] Further, the return mechanism includes a first diverter box and a second diverter box located above the return box, and a piston cylinder, the first diverter box is located above the second diverter box, and a connecting pipe is connected between the first diverter box and the second diverter box, a first return pipe is connected between the fixed ring and the first diverter box, a second return pipe is connected between the first diverter box and the piston cylinder, a partition net is arranged in the second return pipe near the piston cylinder, a third return pipe is connected between the second diverter box and the return box, a first cover plate is rotatably connected in the first diverter box, a second cover plate is rotatably connected in the second diverter box, a torsion spring is arranged at the connection between the first cover plate and the first diverter box, the second cover plate is obliquely arranged in the second diverter box, a piston plate is arranged in the piston cylinder, a piston rod is arranged on the side of the piston plate, and a limiting bead is arranged near one end of the piston rod, when the piston plate is not moving, the first cover plate will cover the pipe mouth of the first return pipe under the action of the torsion spring, and the second cover plate will cover part of the pipe mouth of the third return pipe.

[0017] Furthermore, the support frame includes a frame body and a support box, the motor is arranged on the top of the support box, the driving mechanism includes an L-shaped protective box, a receiving ring and a driving ring, a receiving plate is arranged in the horizontal box body of the L-shaped protective box, a first driving shaft is rotatably connected to the receiving plate, and a second driving shaft is rotatably connected to the vertical box body of the L-shaped protective box, first bevel gears are symmetrically arranged at both ends of the first driving shaft, second bevel gears meshing with the first bevel gears are arranged near the top of the spiral rod and the second driving shaft, and the second driving shaft is arranged near the bottom A driving gear is arranged, a plurality of grooves are provided on the driving ring, and a sliding groove slidably connected to the piston rod is provided on the inner ring surface of the driving ring, a limiting track groove matched with the limiting bead is provided in the sliding groove, a plurality of evenly distributed latch teeth are provided on the outer ring surface of the driving ring, the latch teeth are meshed with the driving gear, a connecting ring is connected to the driving ring, a ring groove slidably connected to the connecting ring is provided on the lower surface of the receiving ring, the cross sections of the connecting ring and the ring groove are both arranged to be T-shaped structures, and a plurality of receiving rods are connected between the upper surface of the receiving ring and the frame body.

[0018] Furthermore, a feed port is provided on the surface of the material lifting tube near the bottom end, and the feed port corresponds to the first material collecting box. A discharge port is provided on the surface of the material lifting tube near the top end, and the discharge port corresponds to the second material collecting box.

[0019] Furthermore, a plurality of evenly distributed balls are disposed on the first annular limiting plate and the second annular limiting plate, and ball grooves are formed on the inner walls of the first limiting groove and the second limiting groove.

[0020] A screening method based on the above-mentioned granular hot melt adhesive discharge screening device comprises the following steps:

[0021] S1: First, start the motor and put the granular hot melt adhesive material to be screened into the feed bin. The material will enter the screening cylinder through the feed channel. The screening cylinder will rotate under the cooperation of the motor, screw rod, transmission mechanism and central axis. The material will be preliminarily screened by the centrifugal force. The material smaller than the qualified size will fall into the device box and be discharged through the discharge pipe.

[0022] S2: After the initial screening, the qualified size materials and the materials larger than the qualified size will enter the return material box under the cooperation of the return material mechanism and the driving mechanism, and then fall on the first screening net for secondary screening. The qualified size materials fall into the first collection box and are transported through the lifting pipe and the rotating screw rod. The qualified size materials will be lifted into the second collection box and discharged through the discharge channel;

[0023] S3: After the secondary screening, the materials larger than the qualified size will fall to the bottom of the return box, and then enter the cutting barrel, where they will be cut into materials of the qualified size. Then the waste materials and materials of the qualified size generated by the cutting will fall into the screening barrel for screening, and steps S1-S3 will be repeated.

[0024] The beneficial effects of the present invention are as follows: the spiral rod is driven by a motor to rotate, and the spiral rod, the transmission mechanism and the screening drum cooperate to drive the screening drum to rotate, and the granular hot melt adhesive material in the screening drum will be moved along the second screening net under the action of centrifugal force. At the same time, the screen holes of the second screening net will screen the material, and the material smaller than the qualified size will be screened out, fall into the device box, and be discharged through the discharge pipe, while the material of the qualified size and the material larger than the qualified size will move upward along the second screening net, and then, under the cooperation of the return mechanism and the driving mechanism, the airflow generated by the centrifugal force and the negative pressure enters the return box, falls on the first screening net for secondary screening, and the qualified Materials of qualified size fall into the first collecting box and are transported through the lifting pipe and the rotating screw rod. Materials of qualified size will be lifted into the second collecting box and discharged through the discharge channel. Materials larger than the qualified size will enter the cutting barrel for cutting and be processed into materials of qualified size. The waste materials and materials of qualified size generated by cutting will fall into the screening barrel for screening. The above steps are then repeated to process materials of unqualified size in the process of screening materials to increase the number of materials of qualified size. In the screening process, there is no need to stop the machine to discharge materials, which facilitates continuous production and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the granular hot melt adhesive discharging and screening device of the present invention;

[0026] Figure 2 It is a schematic cross-sectional view of the granular hot melt adhesive discharging and screening device of the present invention;

[0027] Figure 3 It is a schematic diagram of the three-dimensional cross-sectional structure of the granular hot melt adhesive discharging and screening device of the present invention;

[0028] Figure 4 The present invention Figure 3 A magnified schematic diagram of the local structure A;

[0029] Figure 5 Yes, this invention Figure 3 A magnified schematic diagram of the local structure B;

[0030] Figure 6 It is a partial structural schematic diagram of the granular hot melt adhesive discharging and screening device of the present invention;

[0031] Figure 7 It is a schematic diagram of the first structure of the cutting barrel of the granular hot melt adhesive discharging and screening device of the present invention;

[0032] Figure 8 It is a second structural schematic diagram of the cutting barrel of the granular hot melt adhesive discharging and screening device of the present invention;

[0033] Fig. 9 It is a schematic diagram of the cross-sectional structure of the cutting barrel of the granular hot melt adhesive discharging and screening device of the present invention;

[0034] Fig.10 The present invention Fig. 9 A magnified schematic diagram of the local structure C;

[0035] Fig.11 It is a schematic diagram of a partial structure of a 3D cross-section of a granular hot melt adhesive discharging and screening device of the present invention;

[0036] Fig.12 It is a schematic diagram of the driving ring structure of the granular hot melt adhesive discharging and screening device of the present invention.

[0037] The names corresponding to the marks in the figure are:

[0038] 1. Device box; 2. Screening cylinder; 201. Upper cylinder cover; 202. Lower cylinder cover; 203. Rotating ring; 204. Fixed ring; 205. Fixed column; 206. Second screening net; 207. Connecting rod; 208. First annular stop plate; 209. Second annular stop plate; 210. Ball bearing; 3. Discharge pipe; 4. Support frame; 41. Frame; 42. Support box; 5. Motor; 6. Lifting pipe; 61. Feed inlet; 62 , discharge port; 7, spiral rod; 8, return box; 9, first collection box; 10, first screening net; 11, cutting barrel; 111, side plate; 112, partition; 113, rotating drum; 114, trough; 115, arc-shaped limiting plate; 116, arc-shaped cutting knife; 117, baffle; 118, compression spring; 119, connecting column; 12, rotating shaft; 13, large bevel gear; 14, center shaft; 15, small bevel gear; 16, return Feeding mechanism; 1601, first diverter box; 1602, second diverter box; 1603, piston cylinder; 1604, connecting pipe; 1605, first return pipe; 1606, second return pipe; 1607, separation net; 1608, third return pipe; 1609, first cover plate; 1610, second cover plate; 1611, piston plate; 1612, piston rod; 1613, limit bead; 17, feeding channel; 18, feeding bin ; 19. Second collecting box; 20. Discharging channel; 21. First gear; 22. Connecting shaft; 23. Large gear; 24. Small gear; 25. L-shaped protection box; 26. Receiver ring; 27. Drive ring; 28. Receiver plate; 29. ​​First drive shaft; 30. Second drive shaft; 31. First bevel gear; 32. Second bevel gear; 33. Drive gear; 34. Groove; 35. Gear; 36. Connecting ring; 37. Receiver rod. DETAILED DESCRIPTION

[0039] 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 belong to the scope of protection of the present invention.

[0040] Embodiments of the present invention:

[0041] like Figure 1-Figure 4As shown, the present invention provides a granular hot melt adhesive discharging and screening device, including a device box 1, a transmission mechanism, a plurality of cutting cylinders 11, a central shaft 14 and a driving mechanism, a screening cylinder 2 is arranged in the device box 1, and a discharge pipe 3 is arranged at the bottom of the device box 1, a support frame 4 is arranged on the top of the device box 1, a motor 5 and a feeding pipe 6 are arranged on the support frame 4, a screw rod 7 connected to the motor 5 is arranged in the feeding pipe 6, a return box 8 is arranged on the screening cylinder 2, the bottom end of the feeding pipe 6 is located in the return box 8, and the bottom end of the feeding pipe 6 is provided with a first collecting A material box 9, a first screening net 10 is arranged between the top of the first material collecting box 9 and the material lifting pipe 6, the first screening net 10 is arranged in a conical structure, the first screening net 10 is used to separate the materials of qualified size from the materials larger than the qualified size, and the setting of the conical structure of the first screening net 10 facilitates the sliding of the separated materials larger than the qualified size, a mechanism box is arranged at the bottom of the first material collecting box 9, a return mechanism 16 is arranged between the screening cylinder 2 and the return box 8, the driving mechanism is arranged on the support frame 4, and the driving mechanism is used to drive the return mechanism 16;

[0042] like Figure 1-Figure 5 As shown, the return mechanism 16 includes a first diverter box 1601 and a second diverter box 1602 located above the return box 8, and a piston cylinder 1603. The first diverter box 1601 is located above the second diverter box 1602, and a connecting pipe 1604 is connected between the first diverter box 1601 and the second diverter box 1602. A first return pipe 1605 is connected between the fixing ring 204 and the first diverter box 1601, and a second return pipe 1606 is connected between the first diverter box 1601 and the piston cylinder 1603. A partition net 1607 is provided in the second return pipe 1606 near the piston cylinder 1603. The partition net 1607 is used to block the material and prevent it from entering the piston cylinder 1603. A third diverter box 1602 is connected between the second diverter box 1602 and the return box 8. The return pipe 1608, the first shunt box 1601 is rotatably connected with the first cover plate 1609, the second shunt box 1602 is rotatably connected with the second cover plate 1610, a torsion spring is provided at the connection between the first cover plate 1609 and the first shunt box 1601, the second cover plate 1610 is tiltedly provided in the second shunt box 1602, a piston plate 1611 is provided in the piston cylinder 1603, a piston rod 1612 is provided on the side of the piston plate 1611, and a limiting bead 1613 is provided near one end of the piston rod 1612. When the piston plate 1611 is not moving, the first cover plate 1609 will cover the pipe opening of the first return pipe 1605 under the action of the torsion spring, and the second cover plate 1610 will cover part of the pipe opening of the third return pipe 1608;

[0043] like Figure 1-Figure 5 ,as well as Figure 11-12As shown, the support frame 4 includes a frame body 41 and a support box 42, the motor 5 is arranged on the top of the support box 42, the driving mechanism includes an L-shaped protection box 25, a receiving ring 26 and a driving ring 27, a receiving plate 28 is arranged in the horizontal box body of the L-shaped protection box 25, a first driving shaft 29 is rotatably connected to the receiving plate 28, and a second driving shaft 30 is rotatably connected to the vertical box body of the L-shaped protection box 25, first bevel gears 31 are symmetrically arranged at both ends of the first driving shaft 29, and second bevel gears meshing with the first bevel gear 31 are arranged near the top of the spiral rod 7 and the second driving shaft 30. The second drive shaft 30 is provided with a driving gear 33 near the bottom, a plurality of grooves 34 are provided on the driving ring 27, and a slide groove slidably connected to the piston rod 1612 is provided on the inner ring surface of the driving ring 27, and a limit track groove matched with the limit bead 1613 is provided in the slide groove, a plurality of evenly distributed latch teeth 35 are provided on the outer ring surface of the driving ring 27, and the latch teeth 35 are meshed with the driving gear 33, a connecting ring 36 is connected to the driving ring 27, and an annular groove slidably connected to the connecting ring 36 is provided on the lower surface of the receiving ring 26, and the connecting ring 36 and the ring The cross-section of the shaped grooves is set to a T-shaped structure. A plurality of receiving rods 37 are connected between the upper surface of the receiving ring 26 and the frame body 41. When the spiral rod 7 rotates, the driving ring 27 is rotated through the transmission cooperation between the first bevel gear 31, the second bevel gear 32, the first drive shaft 29, the second drive shaft 30, the drive gear 33, and the latch 35. Then, the piston plate 1611 will reciprocate and push the piston plate 1611 to move under the cooperation of the limiting bead 1613 and the limiting track groove, thereby generating negative pressure, which will cause the flow of air, and the third return pipe When the air in 1608 flows upward, it will push the second cover plate 1610 to cover the pipe opening of the connecting pipe 1604. Then, under the action of negative pressure, the air in the first return pipe 1605 will push open the first cover plate 1609 covering the pipe opening of the first return pipe 1605. During the process of the piston plate 1611 pushing back, the first cover plate 1609 will continue to cover the pipe opening of the first return pipe 1605 under the action of the torsion spring, and the air will pass through the only passage and enter the return box 8 through the third return pipe 1608.

[0044] like Figure 1-Figure 6As shown, the screening drum 2 includes an upper drum cover 201 and a lower drum cover 202, and a rotating ring 203. The lower surface of the upper drum cover 201 is connected with a fixing ring 204, and a fixing column 205 is connected between the lower surface of the upper drum cover 201 and the device box 1. A second screening net 206 is arranged between the rotating ring 203 and the lower drum cover 202. The second screening net 206 is arranged in a conical structure. Through such an arrangement, the granular hot melt adhesive material in the screening drum 2 will be subjected to the centrifugal force and move upward along the second screening net 206. In this process, the materials smaller than the qualified size are separated. The material will be screened out, while the material of qualified size or larger than qualified size will move upward along the second screening net 206, and the airflow generated by the centrifugal force and the negative pressure of the material return mechanism 16 will make the material of qualified size or larger than qualified size enter the material return mechanism 16 through the first material return pipe 1605, and fall onto the first screening net 10 of the material return box 8 through the push back of the piston plate 1611, wherein the push back of the piston plate 1611 will accelerate the flow rate of air, thereby accelerating the material to fall into the material return box 8, thereby improving efficiency, and under the action of pressure, it can prevent material blockage;

[0045] like Figure 1-Figure 10 As shown, a plurality of evenly distributed connecting rods 207 are fixed between the rotating ring 203 and the lower cylinder cover 202, and the connecting rods 207 are located outside the second screening net 206. A first annular limiting plate 208 is connected to the lower surface of the fixed ring 204, and a first limiting groove slidably connected to the first annular limiting plate 208 is provided on the rotating ring 203, and a second annular limiting plate 209 is connected to the side of the rotating ring 203. An adapting hole adapted to the rotating ring 203 is provided on the device box 1, and a second limiting groove slidably connected to the second annular limiting plate 209 is provided on the inner wall of the adapting hole. A plurality of evenly distributed balls 210 are arranged on the first annular limiting plate 208 and the second annular limiting plate 209, and ball grooves are provided on the inner walls of the first limiting groove and the second limiting groove. The setting can reduce friction and facilitate rotation. A feed channel 17 is provided on the screening cylinder 2, a feed bin 18 is provided on the feed channel 17, a second collecting box 19 is provided on the lifting pipe 6, and a discharge channel 20 is provided on the side of the second collecting box 19. A feed port 61 is provided on the surface of the lifting pipe 6 near the bottom end, and the feed port 61 corresponds to the first collecting box 9. A discharge port 62 is provided on the surface of the lifting pipe 6 near the top end, and the discharge port 62 corresponds to the second collecting box 19. Materials of qualified sizes separated by the first screening net 10 will fall into the first collecting box 9, enter the lifting pipe 6 through the feed port 61, and are transported by the rotating screw rod 7, and then are introduced into the second collecting box 19 through the discharge port 62, and are discharged through the discharge channel 20;

[0046] like Figure 1-Figure 4As shown, the transmission mechanism is arranged in the mechanism box, the transmission mechanism is connected with the spiral rod 7, the transmission mechanism comprises two first gears 21, a connecting shaft 22, a large gear 23 and a small gear 24, the connecting shaft 22 is rotatably connected in the mechanism box, the two first gears 21 are respectively sleeved on the bottom end of the spiral rod 7 and the connecting shaft 22, and the two first gears 21 are meshed with each other, the large gear 23 is sleeved on the connecting shaft 22, the small gear 24 is sleeved on the central shaft 14, and the large gear 23 and the small gear 24 are meshed with each other, wherein the number of teeth of the large gear 23 is greater than the number of teeth of the small gear 24, the meshing of the two first gears 21 and the meshing of the large gear 23 and the small gear 24 can form a linkage between the spiral rod 7 and the central shaft 14, so that in the screening work of the screening drum 2, the material can be transported and exported, and the difference in the number of teeth of the large gear 23 and the small gear 24 can speed up the rotation speed of the screening drum 2, thereby increasing the centrifugal force;

[0047] like Figure 2-Figure 10As shown, a plurality of cutting barrels 11 are arranged in the screening barrel 2 and are connected to the return box 8. A rotating shaft 12 is arranged on the cutting barrel 11. A large bevel gear 13 is arranged at one end of the rotating shaft 12. A central shaft 14 is fixed in the screening barrel 2. The central shaft 14 is connected to the transmission mechanism, and a small bevel gear 15 meshing with the large bevel gear 13 is arranged on the central shaft 14. The number of teeth of the large bevel gear 13 is greater than the number of teeth of the small bevel gear 15. The cutting barrel 11 includes two side plates 111, and a partition plate 11 is connected between the two side plates 111. 2, and a rotating drum 113 is arranged between the two side plates 111, the rotating drum 113 is sleeved on the rotating shaft 12, the side plates 111 and the partition 112 form a material discharge channel, a plurality of evenly distributed material troughs 114 are opened on the rotating drum 113, the size of the material trough 114 is the same as the size of the qualified material, an arc-shaped material limiting plate 115 and an arc-shaped material cutting knife 116 are connected between the two side plates 111, a compression groove is opened at the bottom of the partition 112 near the arc-shaped material limiting plate 115, and a baffle 117 is arranged in the compression groove, and the baffle 117 is arranged in the compression groove. A compression spring 118 is arranged between 7 and the top wall of the compression groove, and the side of the baffle 117 is arranged in an arc-shaped structure. The sides of the two side plates 111 are connected with connecting columns 119. The materials larger than the qualified size separated by the first screening net 10 will fall into the bottom of the return box 8, and then fall onto the drum 113 through the material discharge channel. The drum 113 will rotate through the rotating shaft 12 under the meshing cooperation of the large bevel gear 13 and the small bevel gear 15. As the drum 113 rotates, the materials larger than the qualified size falling into the trough 114 will be The materials of the qualified size will also rotate, and the part of the materials extending out of the trough 114 will contact the arc-shaped structural surface of the baffle 117, lift the baffle 117, and then pass through the arc-shaped limiting plate 115 and contact the arc-shaped cutting knife 116, and the arc-shaped cutting knife 116 will cut off the extended part, and then the materials in the trough 114 will become the materials of the qualified size. The difference in the number of teeth of the large bevel gear 13 and the small bevel gear 15 can reduce the rotation speed of the drum 113, so that the materials larger than the qualified size can fall into the trough 114.

[0048] According to the granular hot melt adhesive discharging screening device of the embodiment of the present invention, the screening method thereof comprises the following steps:

[0049] S1: First, start the motor 5 and put the granular hot melt adhesive material to be screened into the feed bin 18. The material will enter the screening drum 2 through the feed channel 17. The screening drum 2 will rotate under the cooperation of the motor 5, the screw rod 7, the transmission mechanism and the central shaft 14. The material is preliminarily screened by the action of centrifugal force. The granular hot melt adhesive material in the screening drum 2 will move upward along the second screening net 206 of the conical structure under the action of centrifugal force. In this process, materials smaller than the qualified size will be screened out, and materials of the qualified size and larger than the qualified size will move upward along the second screening net 206. Materials smaller than the qualified size will fall into the device box 1 and be discharged through the discharge pipe 3.

[0050] S2: After the preliminary screening, under the cooperation of the return mechanism 16 and the driving mechanism, when the screw rod 7 rotates, the driving ring 27 rotates, and then the piston plate 1611 will push the piston plate 1611 back and forth to move under the cooperation of the limiting bead 1613 and the limiting track groove, thereby generating negative pressure and causing the flow of air. When the air in the third return pipe 1608 flows upward, it will push the second cover plate 1610 to cover the pipe mouth of the connecting pipe 1604 to form a seal. Then, under the action of negative pressure, the air in the first return pipe 1605 will push open the first cover plate 1609 covering the pipe mouth of the first return pipe 1605. At the same time, materials of qualified size and materials larger than qualified size will enter the return pipe through the first return pipe 1605 due to centrifugal force and negative pressure airflow. Mechanism 16, during the process of the piston plate 1611 being pushed back, the first cover plate 1609 will continue to cover the mouth of the first return pipe 1605 under the action of the torsion spring to form a closure, and the qualified size materials and the materials larger than the qualified size will pass through the only passage along with the air, enter the return box 8 through the third return pipe 1608, and then fall on the first screening net 10 of the conical structure for secondary screening, the first screening net 10 is used to separate the qualified size materials and the materials larger than the qualified size, the qualified size materials fall into the first collecting box 9, enter the lifting pipe 6 through the feed port 61, and are transported through the lifting pipe 6 and the rotating screw rod 7, and then the qualified size materials will be lifted to the discharge port 62, introduced into the second collecting box 19 through the discharge port 62, and discharged through the discharge channel 20;

[0051] S3: After the secondary screening, the materials larger than the qualified size will fall into the bottom of the return box 8, and then enter the cutting barrel 11, and fall onto the rotating drum 113 through the material discharge channel, and are cut by the cutting barrel 11. The rotating drum 113 rotates through the rotating shaft 12 under the meshing cooperation of the large bevel gear 13 and the small bevel gear 15. As the rotating drum 113 rotates, the materials larger than the qualified size that fall into the trough 114 will also rotate, and the part of the materials extending out of the trough 114 will contact the arc-shaped structural surface of the baffle 117. , lift up the baffle 117, then pass through the arc-shaped limiting plate 115 and contact the arc-shaped cutting knife 116, and the arc-shaped cutting knife 116 cuts off the protruding part. At this time, the material in the trough 114 becomes material of qualified size. The difference in the number of teeth of the large bevel gear 13 and the small bevel gear 15 can reduce the rotation speed of the rotating drum 113, making it convenient for materials larger than the qualified size to fall into the trough 114, and then the waste generated by cutting and the material of qualified size will fall into the screening drum 2 for screening, and repeat steps S1-S3.

Claims

1. A granular hot melt adhesive discharging and screening device, characterized in that: include: A device box (1), wherein a screening drum (2) is arranged in the device box (1), and a discharge pipe (3) is arranged at the bottom of the device box (1), a support frame (4) is arranged at the top of the device box (1), a motor (5) and a lifting pipe (6) are arranged on the support frame (4), a screw rod (7) connected to the motor (5) is arranged in the lifting pipe (6), a return box (8) is arranged on the screening drum (2), the bottom end of the lifting pipe (6) is located in the return box (8), and a first collecting box (9) is arranged at the bottom end of the lifting pipe (6), a first screening net (10) is arranged between the top of the first collecting box (9) and the lifting pipe (6), and a mechanism box is arranged at the bottom of the first collecting box (9); A transmission mechanism is arranged in the mechanism box, and the transmission mechanism is connected to the screw rod (7); A plurality of cutting barrels (11) are arranged in the screening barrel (2) and are connected to the return box (8); a rotating shaft (12) is arranged on the cutting barrel (11); a large bevel gear (13) is arranged at one end of the rotating shaft (12); A central shaft (14) is fixed in the screening drum (2), the central shaft (14) is connected to the transmission mechanism, and a small bevel gear (15) meshing with the large bevel gear (13) is provided on the central shaft (14); A material return mechanism (16) is provided between the screening cylinder (2) and the material return box (8), and a material feed channel (17) is provided on the screening cylinder (2), and a material feed bin (18) is provided on the material feed channel (17). The screening cylinder (2) comprises an upper cylinder cover (201), a lower cylinder cover (202), and a rotating ring (203), and a fixing ring (204) is connected to the lower surface of the upper cylinder cover (201); A driving mechanism, disposed on the support frame (4), the driving mechanism being used to drive the material returning mechanism (16); The lifting pipe (6) is provided with a second material collecting box (19), and a material discharge channel (20) is provided on the side of the second material collecting box (19); The material return mechanism (16) comprises a first flow diverter box (1601) and a second flow diverter box (1602) located above the material return box (8), and a piston cylinder (1603); the first flow diverter box (1601) is located above the second flow diverter box (1602), and a connecting pipe (1604) is connected between the first flow diverter box (1601) and the second flow diverter box (1602); a first material return pipe (1605) is connected between the fixing ring (204) and the first flow diverter box (1601); a second material return pipe (1606) is connected between the first flow diverter box (1601) and the piston cylinder (1603); a partition net (1607) is provided in the second material return pipe (1606) at a position close to the piston cylinder (1603); a third material return pipe (1608) is connected between the second flow diverter box (1602) and the material return box (8); the first flow diverter box (1601) is connected to the second flow diverter box (1602); and the second flow diverter box (1602) is connected to the material return box (8). A first cover plate (1609) is rotatably connected in the piston cylinder (1603), a second cover plate (1610) is rotatably connected in the second diverter box (1602), a torsion spring is provided at the connection between the first cover plate (1609) and the first diverter box (1601), the second cover plate (1610) is tiltedly arranged in the second diverter box (1602), a piston plate (1611) is arranged in the piston cylinder (1603), a piston rod (1612) is arranged on the side of the piston plate (1611), and a limiting bead (1613) is arranged near one end of the piston rod (1612), when the piston plate (1611) does not move, the first cover plate (1609) will cover the pipe opening of the first return pipe (1605) under the action of the torsion spring, and the second cover plate (1610) will cover part of the pipe opening of the third return pipe (1608).

2. A granular hot melt adhesive discharging and screening device according to claim 1, characterized in that: A fixing column (205) is connected between the lower surface of the upper cylinder cover (201) and the device box (1); a second screening net (206) is arranged between the rotating ring (203) and the lower cylinder cover (202); and a plurality of evenly distributed connecting rods (207) are fixed between the rotating ring (203) and the lower cylinder cover (202); the connecting rods (207) are located outside the second screening net (206); a first annular limiting plate (208) is connected to the lower surface of the fixing ring (204); a first limiting groove slidably connected to the first annular limiting plate (208) is provided on the rotating ring (203); a second annular limiting plate (209) is connected to the side surface of the rotating ring (203); and an adapting hole adapted to the rotating ring (203) is provided on the device box (1); and a second limiting groove slidably connected to the second annular limiting plate (209) is provided on the inner wall of the adapting hole.

3. A granular hot melt adhesive discharging and screening device according to claim 1, characterized in that: The transmission mechanism comprises two first gears (21), a connecting shaft (22), a large gear (23) and a small gear (24); the connecting shaft (22) is rotatably connected in the mechanism box; the two first gears (21) are respectively sleeved on the bottom end of the spiral rod (7) and the connecting shaft (22), and the two first gears (21) are meshed with each other; the large gear (23) is sleeved on the connecting shaft (22), and the small gear (24) is sleeved on the central shaft (14), and the large gear (23) and the small gear (24) are meshed with each other.

4. A granular hot melt adhesive discharging and screening device according to claim 1, characterized in that: The cutting barrel (11) comprises two side plates (111), a partition plate (112) is connected between the two side plates (111), and a rotating drum (113) is arranged between the two side plates (111), the rotating drum (113) is sleeved on the rotating shaft (12), the side plates (111) and the partition plate (112) form a material discharge channel, and a plurality of evenly distributed material grooves (114) are provided on the rotating drum (113). An arc-shaped material limiting plate (115) and an arc-shaped cutting knife (116) are connected therebetween; a compression groove is provided at the bottom end of the partition plate (112) close to the arc-shaped material limiting plate (115); a baffle plate (117) is provided in the compression groove; a compression spring (118) is provided between the baffle plate (117) and the top wall of the compression groove; and a side surface of the baffle plate (117) is provided in an arc-shaped structure; and the sides of the two side plates (111) are both connected to connecting columns (119).

5. A granular hot melt adhesive discharging and screening device according to claim 1, characterized in that: The support frame (4) comprises a frame body (41) and a support box (42); the motor (5) is arranged on the top of the support box (42); the driving mechanism comprises an L-shaped protection box (25), a receiving ring (26) and a driving ring (27); a receiving plate (28) is arranged in the horizontal box body of the L-shaped protection box (25); a first driving shaft (29) is rotatably connected to the receiving plate (28); and a second driving shaft (30) is rotatably connected to the vertical box body of the L-shaped protection box (25); first bevel gears (31) are symmetrically arranged at both ends of the first driving shaft (29); second bevel gears (32) meshing with the first bevel gear (31) are arranged near the top of the spiral rod (7) and the second driving shaft (30); and a second bevel gear (32) meshing with the first bevel gear (31) is arranged near the bottom of the second driving shaft (30). A driving gear (33) is arranged on the drive ring (27), a plurality of grooves (34) are provided on the drive ring (27), a sliding groove slidably connected to the piston rod (1612) is provided on the inner ring surface of the drive ring (27), a limiting track groove matched with the limiting bead (1613) is provided in the sliding groove, a plurality of evenly distributed latch teeth (35) are provided on the outer ring surface of the drive ring (27), the latch teeth (35) are meshed with the driving gear (33), a connecting ring (36) is connected to the drive ring (27), a ring groove slidably connected to the connecting ring (36) is provided on the lower surface of the receiving ring (26), the cross sections of the connecting ring (36) and the ring groove are both arranged in a T-shaped structure, and a plurality of receiving rods (37) are connected between the upper surface of the receiving ring (26) and the frame (41).

6. A granular hot melt adhesive discharging and screening device according to claim 1, characterized in that: A feed port (61) is provided on the surface of the material lifting pipe (6) near the bottom end, and the feed port (61) corresponds to the first material collecting box (9). A discharge port (62) is provided on the surface of the material lifting pipe (6) near the top end, and the discharge port (62) corresponds to the second material collecting box (19).

7. A granular hot melt adhesive discharging and screening device according to claim 2, characterized in that: The first annular limiting plate (208) and the second annular limiting plate (209) are both provided with a plurality of evenly distributed balls (210), and the inner walls of the first limiting groove and the second limiting groove are both provided with ball grooves.

8. A method for screening granular hot melt adhesive discharge, used in the granular hot melt adhesive discharge screening device as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: S1: First, the motor (5) is started and the granular hot melt adhesive material to be screened is put into the feed bin (18). The material will enter the screening drum (2) through the feed channel (17). The screening drum (2) will rotate under the cooperation of the motor (5), the screw rod (7), the transmission mechanism and the central shaft (14). The material is initially screened by the action of centrifugal force. The material smaller than the qualified size will fall into the device box (1) and be discharged through the discharge pipe (3); S2: After the initial screening, the qualified size materials and the materials larger than the qualified size will enter the return material box (8) under the cooperation of the return material mechanism (16) and the driving mechanism, and then fall on the first screening net (10) for secondary screening. The qualified size materials fall into the first collecting box (9) and are transported through the lifting pipe (6) and the rotating screw rod (7). The qualified size materials will be lifted into the second collecting box (19) and discharged through the discharge channel (20); S3: After secondary screening, materials larger than the qualified size will fall into the bottom of the return box (8) and then enter the cutting cylinder (11). The cutting cylinder (11) will cut the materials into materials of the qualified size. Then, the waste materials and materials of the qualified size generated by the cutting will fall into the screening cylinder (2) for screening, and steps S1 to S3 will be repeated.

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