A plastic extrusion granulation device

Abstract

The present invention relates to the technical field of granulation equipment, and specifically discloses a plastic extrusion granulation device, which includes an extruder, a cooling mechanism, and a pelletizer. The cooling mechanism includes a first water tank, a second water tank arranged above the first water tank, and a driving assembly. The left and right ends of the second water tank are respectively communicated with the first water tank through water pumps, and water outlet holes are respectively opened at the left and right ends of the second water tank. When the driving assembly drives the left end of the second water tank to swing upward and the right end to swing downward, the water pump connected to the left end of the second water tank pumps the cooling water in the first water tank into the second water tank. When the driving assembly drives the right end of the second water tank to swing upward and the left end to swing downward, the water pump connected to the right end of the second water tank pumps the cooling water in the first water tank into the second water tank. The plastic extrusion granulation device of the present invention can enable the strip-shaped plastic to be cooled more evenly during the traction process, and improve the problems of inconsistent quality or irregular shape of plastic particles caused by temperature differences.

Description

Technical Field

[0001] The present invention relates to the technical field of granulation equipment, and particularly relates to a plastic extrusion granulation device. Background Art

[0002] Plastic extrusion granulation devices are important equipment in the plastic processing industry, mainly used to process plastic raw materials through processes such as melting, extrusion, cooling, and cutting to produce granular plastic products. During the production process, after the molten plastic raw material enters the extruder, it is extruded by the extruder to form a strip of plastic. The strip of plastic falls into a water tank and is cooled by the cooling water in the water tank to reduce the temperature of the plastic strip, prevent adhesion, and at the same time, the cooled plastic strip is more easily cut into uniform small particles to ensure the quality and consistency of the finished product particles.

[0003] Since the temperature of the cooling water will increase after being used for a period of time, resulting in a reduced cooling effect, it is necessary to add new cooling water into the water tank to adjust the temperature and at the same time replenish the cooling water in the water tank. However, after adding new cooling water, the temperature in the water tank may drop suddenly, causing the strip of plastic to become too hard and prone to breaking during the traction of the strip of plastic.

[0004] Chinese Patent with Publication No. CN115742080B discloses a plastic granulator with an automatic sorting device, including a base, an extruder, a head, and a pelletizer. The extruder and the pelletizer are respectively installed at the left and right ends of the upper surface of the base, and the head is installed at the extrusion end of the extruder. It also includes a cooling mechanism, which includes a water tank, a controller, a solenoid valve, a heater, a lifting component, and a temperature sensor. When the water temperature in the water tank is too low, this patent uses the lifting component to lift the strip of plastic to reduce the contact area between the strip of plastic and the cooling water to prevent the problem that the strip of plastic is prone to breaking due to excessive cooling.

[0005] However, when adding new cooling water into the water tank in the above patent, the adding position is fixed, and the water temperature in the water tank varies, resulting in uneven cooling of the strip of plastic, which is likely to cause local overheating or local overcooling of the strip of plastic, making the quality of the produced plastic particles inconsistent or the shape irregular.

[0006] Therefore, there is a need in the art for a plastic extrusion granulation device to solve the above problems. Summary of the Invention

[0007] The present invention provides a plastic extrusion granulation device, aiming to solve the problem that after adding new cooling water in the granulation device in the related art, the water temperature difference in the water tank is large, which is likely to cause uneven cooling of the strip of plastic and affect the forming quality of the plastic particles.

[0008] A plastic extrusion granulation device of the present invention includes an extruder, a cooling mechanism, and a pelletizer. The strip-shaped plastic extruded by the extruder passes through the cooling mechanism from right to left. The cooling mechanism includes a first water tank, a second water tank arranged above the first water tank, and a driving component for driving the left and right ends of the second water tank to swing up and down. The left and right ends of the second water tank are respectively communicated with the first water tank through water pumps, and water outlet holes are respectively opened at the left and right ends of the second water tank;

[0009] When the driving component drives the left end of the second water tank to swing upward and the right end to swing downward, the water pump connected to the left end of the second water tank pumps the cooling water in the first water tank into the second water tank. When the driving component drives the right end of the second water tank to swing upward and the left end to swing downward, the water pump connected to the right end of the second water tank pumps the cooling water in the first water tank into the second water tank.

[0010] In the present invention, by arranging two water tanks, when new cooling water needs to be added, the cooling water is first added into the first water tank and is initially mixed with the original cooling water in the first water tank, and then is pumped into the second water tank through a water pump to be secondarily mixed with the cooling water in the second water tank, which can avoid the problem that the water temperature in the second water tank drops suddenly after the new cooling water is added, resulting in the breakage of the strip-shaped plastic due to excessive cooling; moreover, by driving the left and right ends of the second water tank to swing up and down through the driving component, the cooling water pumped into the second water tank can be quickly mixed with the original cooling water, reducing the temperature gradient of the water temperature in the second water tank, so that the strip-shaped plastic can be cooled more evenly during the traction process, improving the problem of inconsistent quality or irregular shape of the plastic particles caused by temperature differences; in addition, the cooling water flows left and right in the second water tank, which can effectively exchange heat with the strip-shaped plastic, take away heat, and cool it quickly, improving the cooling efficiency while ensuring the cooling effect.

[0011] Preferably, the second water tank is rotatably connected to the first water tank. The driving component includes automatic telescopic rods arranged on the left and right sides of the rotational connection between the second water tank and the first water tank. The automatic telescopic rods are fixedly installed on the first water tank, and the driving ends of the automatic telescopic rods are connected to the second water tank through connecting pieces.

[0012] Preferably, filtering components are respectively arranged at positions near the left and right ends in the second water tank. A backwashing component is arranged on the filtering component. A sewage discharge port is opened on the second water tank, and the backwashing component backwashes the impurities filtered on the filtering component into the sewage discharge port.

[0013] When the cooling water in the second water tank is discharged, the cooling water will pass through the filtering assembly. The filtering assembly removes impurities in the cooling water, and then the backwashing assembly backwashes the impurities attached to the filtering assembly to the sewage outlet for discharge, filtering and purifying the cooling water, avoiding the problems that impurities are mixed in the cooling water to reduce the heat conduction efficiency of the cooling water, and that impurities attached to the strip-shaped plastic will be brought into subsequent processes such as cutting, screening and packaging to contaminate the final product, and ensuring a good heat exchange effect between the cooling water and the strip-shaped plastic.

[0014] Preferably, the filtering assembly includes a filter plate fixedly connected in the second water tank. Filter holes and water inlet holes are formed in the filter plate. When the water pump pumps water into the second water tank, the cooling water enters the second water tank through the water inlet holes. When the left end or the right end of the second water tank swings downward, the cooling water in the second water tank is filtered by the filter plate at the corresponding end and then discharged into the first water tank through the water outlet holes.

[0015] Preferably, stop baffles are respectively arranged on one side of the two filter plates in the second water tank facing each other. The stop baffles are slidably connected to the second water tank in the vertical direction and are attached to the corresponding filter plates. A limiting structure is arranged between the stop baffles and the second water tank. The connecting piece is rotatably connected to the driving end of the corresponding automatic telescopic rod, and the connecting piece is slidably connected to the stop baffle in the left-right direction. When the automatic telescopic rod drives the stop baffle to move upward through the connecting piece until the limiting structure takes effect, the stop baffle drives one end of the second water tank to swing upward, and the stop baffle covers the filter holes on the filter plate.

[0016] When one of the left and right ends of the second water tank is at the lowest position, the stop baffle corresponding to this end is located below the filter holes on the filter plate, avoiding blocking the filter holes and blocking the water inlet holes on the filter plate, ensuring that the cooling water flows out of the filter holes smoothly and realizing the filtration of the cooling water; when water enters this end, the stop baffle blocks the filter holes and exposes the water inlet holes, so that the cooling water in the first water tank is pumped into the second water tank through the water inlet holes, avoiding impurities on the filter holes from entering the second water tank together with the cooling water.

[0017] Preferably, a backwashing cavity is formed on one side of the stop baffle facing the corresponding filter plate, and a pushing structure is arranged between the stop baffle and the filter plate. When the stop baffle moves upward along the filter plate, the pushing structure pushes the stop baffle to move away from the filter plate. When the limiting structure takes effect, the pushing structure pulls the stop baffle to fit on the filter plate. The filter holes are located in the backwashing cavity, and the backwashing cavity is communicated with the sewage outlet.

[0018] When the stop plate moves upward relative to the filter plate, the push structure will push the stop plate away from the filter plate, which can effectively prevent the stop plate from scraping impurities attached to the filter plate to the upper part during the rising process. This design helps the recoil chamber to better cover the filtered impurities, making it easier to recoil and centrally process the impurities.

[0019] Preferably, the recoil assembly comprises an installation box body with an opening at the top and a movable plug vertically slidably connected to the installation box body, the installation box body is located on the side of the two filter plates facing away from each other, the installation box body is provided with a recoil hole corresponding to the filter hole and a water through hole corresponding to the water outlet hole, the movable plug is provided with a leakage hole, and the movable plug is connected to a driving member, and the installation box body is connected to the stop plate; water in the second water tank enters the installation box body from the leakage hole after being filtered by the filter plate, and enters the water outlet hole from the water through hole to be discharged, when the stop plate drives the installation box body to move upward, the groove wall of the second water tank blocks the water through hole, and cooling water remains in the installation box body, when the limiting structure acts, the recoil hole is aligned with the filter hole, and the driving member drives the movable plug to move downward, squeezing the water in the installation box body to recoil the filter hole.

[0020] Preferably, a plurality of water storage chambers are provided in the installation box body at intervals along the front-to-back direction, the movable plug is slidably arranged in the corresponding water storage chamber along the up-down direction, and the bottom of the movable plug is elastically connected to the installation box body, and a one-way valve is provided at the leakage hole, and the one-way valve allows cooling water to enter the water storage chamber from the leakage hole.

[0021] By setting a one-way valve, when the driving member drives the movable plug to move downward along the water storage chamber, the cooling water in the water storage chamber will not overflow from the leakage hole, thereby ensuring that the cooling water effectively recoils the filter hole.

[0022] Preferably, the installation box body and the stop plate are connected through a portal frame, and the portal frame is slidably connected to the installation box body and the stop plate respectively along the front-to-back direction, and an extrusion block is provided at the bottom of the portal frame, and the driving member includes a motor and a lead screw, and the motor is fixedly mounted on the water tank two, the lead screw is rotatably connected to the water tank two and is transmission connected to the output end of the motor, and a movable block is vertically slidably connected on the portal frame, and the movable block is threadably matched with the lead screw, and inclined surfaces are respectively provided on the front and rear sides of the movable plug, and the motor drives the lead screw to drive the movable block to move along the front-to-back direction, and the movable block drives the portal frame and the extrusion block to move along the front-to-back direction, and the extrusion block drives the movable plug to move downward by extruding the inclined surface.

[0023] Preferably, the door-type frame includes a frame body 1 and a frame body 2 which are elastically connected, the frame body 1 being slidably connected to the stop plate, and the frame body 2 being slidably connected to the installation box body, the pushing structure including a pushing block fixedly installed on the filter plate, the upper and lower ends of the pushing block being respectively provided with inclined wedge surfaces, and the stop plate being provided with a pushing groove adapted to the pushing block, when the stop plate moves upward, the inclined wedge surface located at the lower end squeezes the groove surface of the pushing groove, so that the stop plate moves in a direction away from the filter plate, and when the stop plate passes over the pushing block, the frame body 1 drives the stop plate to fit against the filter plate, the recoil chamber cover is provided on the filter hole, and a brush is provided on the side of the frame body 1 facing the filter plate.

[0024] The beneficial effects of the present invention are as follows: the present invention provides two water tanks, and when new cooling water needs to be added, the cooling water is first added to the first water tank, and mixed with the original cooling water in the first water tank for the first time, and then pumped into the second water tank by a water pump, and mixed with the cooling water in the second water tank for the second time, which can avoid the problem of the strip plastic breaking due to excessive cooling caused by the sudden drop of the water temperature in the second water tank after the new cooling water is added;

[0025] Moreover, by driving the left and right ends of the second water tank to swing up and down through the driving component, the cooling water pumped into the second water tank can be quickly mixed with the original cooling water, reducing the temperature gradient of the water temperature in the second water tank, so that the strip plastic can be cooled more evenly during the traction process, improving the problem of inconsistent quality or irregular shape of plastic particles caused by temperature differences;

[0026] In addition, the cooling water flows left and right in the second water tank, which can effectively exchange heat with the strip plastic, take away the heat, and cool it down quickly, thereby ensuring the cooling effect and improving the cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a front view of a plastic extrusion granulation device of the present invention.

[0028] Figure 2 It is a schematic diagram of a cooling mechanism of a plastic extrusion granulation device of the present invention.

[0029] Figure 3 It is a schematic diagram of a filter plate at the left end of a water tank 2 of a plastic extrusion granulation device of the present invention.

[0030] Figure 4 The present invention is a schematic diagram of the positions of a stop plate and a filter plate at the right end of a water tank 2 of a plastic extrusion granulation device.

[0031] Figure 5 The utility model is a schematic diagram of an exploded view of a stop plate and a connecting piece of a plastic extrusion granulation device of the present invention.

[0032] Figure 6 It is a top view of the stop plate and the recoil assembly of a plastic extrusion granulation device of the present invention.

[0033] Figure 7 is Figure 6 A sectional view taken along the middle section A-A in

[0034] Figure 8 It is a sectional view of the recoil assembly of a plastic extrusion granulation device of the present invention.

[0035] Figure 9 It is a schematic diagram of the positions of the stop plate and the filter plate at the left end of the second water tank of a plastic extrusion granulation device of the present invention.

[0036] Reference numerals:

[0037] 1. Extruder; 2. First water tank; 3. Second water tank; 31. Water outlet hole; 32. Support rod; 33. Automatic telescopic rod; 34. Sewage outlet; 35. Slide groove; 4. Water pump; 5. Connecting piece; 51. Inverted T-shaped block; 6. Filter plate; 61. Filter hole; 62. Water inlet hole; 63. Thrust block; 64. Inclined wedge surface; 7. Stop plate; 71. Inverted T-shaped groove; 72. Recoil cavity; 73. Thrust groove; 8. Installation box body; 81. Movable plug; 82. Water storage cavity; 83. First spring; 84. Recoil hole; 85. Water passing hole; 86. Leakage hole; 87. Inclined surface; 9. Gantry; 91. First frame body; 92. Second frame body; 93. Extrusion block; 94. Movable block; 10. Motor; 101. Lead screw. Detailed implementation manners

[0038] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention and should not be construed as a limitation to the present invention.

[0039] As Figures 1 to 9 shown, a plastic extrusion granulation device of the present invention includes an extruder 1, a cooling mechanism, and a pelletizer (not shown in the figure). The strip-shaped plastic extruded by the extruder 1 passes through the cooling mechanism from right to left. The cooling mechanism includes a first water tank 2, a second water tank 3 arranged above the first water tank 2, and a driving assembly for driving the left and right ends of the second water tank 3 to swing up and down. The left and right ends of the second water tank 3 are respectively communicated with the first water tank 2 through a water pump 4, and water outlet holes 31 are respectively opened at the left and right ends of the second water tank 3. A heater (not shown in the figure) and a temperature sensor (not shown in the figure) are arranged in the second water tank 3. When the temperature sensor monitors that the temperature of the cooling water in the second water tank 3 is greater than the set maximum temperature value, an alarm is issued to prompt that new cooling water needs to be added to the first water tank 2. When the temperature sensor monitors that the temperature of the cooling water in the second water tank 3 is less than the set minimum temperature value, the heater is controlled to heat the cooling water in the second water tank 3.

[0040] When the driving component drives the left end of the second water tank 3 to swing upward and the right end to swing downward, the water pump 4 connected to the left end of the second water tank 3 pumps the cooling water in the first water tank 2 into the second water tank 3, and the cooling water in the second water tank 3 is discharged into the first water tank 2 through the water outlet hole 31 at its right end; when the driving component drives the right end of the second water tank 3 to swing upward and the left end to swing downward, the water pump 4 connected to the right end of the second water tank 3 pumps the cooling water in the first water tank 2 into the second water tank 3, and the cooling water in the second water tank 3 is discharged into the first water tank 2 through the water outlet hole 31 at its left end.

[0041] The middle part of the second water tank 3 is rotationally connected to the first water tank 2 through a support rod 32. The driving component includes automatic telescopic rods 33 corresponding to the left and right ends of the second water tank 3 respectively. The automatic telescopic rods 33 are symmetrically arranged on the front and rear sides of the second water tank 3. The bottom ends of the automatic telescopic rods 33 are fixedly installed on the first water tank 2, and the driving ends are connected to the second water tank 3 through a connecting piece 5. As an example, the automatic telescopic rod 33 is an electric push rod.

[0042] There may be impurities in the plastic raw materials and the pipelines of the extruder 1. The first water tank 2 and the second water tank 3 are exposed to the environment, and impurities may also fall in. The impurities mixed in the cooling water will reduce the heat conduction efficiency of the cooling water. Moreover, if the impurities adhere to the strip-shaped plastic, they may be brought into subsequent processes such as cutting, screening, and packaging, thus contaminating the final product. Therefore, in this embodiment, filtering components are respectively arranged at positions close to the left and right ends in the second water tank 3. A backwashing component is arranged on the filtering component, and a sewage discharge port 34 is opened on the second water tank 3. The backwashing component backwashes the impurities filtered on the filtering component into the sewage discharge port 34.

[0043] As Figure 2 and Figure 3 shown, the filtering component includes a filter plate 6 fixedly connected in the second water tank 3. Filter holes 61 and water inlet holes 62 are opened on the filter plate 6. When the water pump 4 pumps water into the second water tank 3, the cooling water enters the second water tank 3 through the water inlet holes 62. When the left end or the right end of the second water tank 3 swings downward, the cooling water in the second water tank 3 is filtered by the corresponding filter plate 6 and then discharged into the first water tank 2 through the water outlet hole 31.

[0044] As Figures 2 to 5 shown, stop baffles 7 are respectively arranged on the sides of the two filter plates 6 in the second water tank 3 facing each other. The stop baffles 7 are slidably connected to the second water tank 3 in the vertical direction and are attached to the corresponding filter plates 6. A limiting structure is arranged between the stop baffles 7 and the second water tank 3. The limiting structure includes a sliding groove 35 opened on the second water tank 3 and a sliding block (not shown in the figure) fixedly connected to the stop baffle 7. The top end of the sliding groove 35 is in a blocked state, and the sliding block is slidably connected in the sliding groove 35 in the vertical direction.

[0045] The connecting member 5 is rotatably connected to the driving end of the corresponding automatic telescopic rod 33, and an inverted T-shaped block 51 is fixedly connected to the bottom of the connecting member 5. An inverted T-shaped groove 71 adapted to the inverted T-shaped block 51 is formed at the top of the stop baffle 7. The connecting member 5 is slidably connected to the stop baffle 7 in the left-right direction through the cooperation of the inverted T-shaped block 51 and the inverted T-shaped groove 71. As Figure 3 and Figure 4 shown, taking the stop baffle 7 at the right end of the second water tank 3 as an example, when the right end of the second water tank 3 is at the lowest position, the stop baffle 7 is located below the filter holes 61 on the filter plate 6, avoiding blocking the filter holes 61 and blocking the water inlet holes 62 on the filter plate 6, ensuring that the cooling water flows out smoothly from the filter holes 61. When the automatic telescopic rod 33 drives the stop baffle 7 to move upward through the connecting member 5, the stop baffle 7 first moves upward relative to the filter plate 6. When the slider abuts against the top end of the sliding groove 35, the stop baffle 7 drives the left end of the second water tank 3 to swing upward. At this time, the stop baffle 7 covers the filter holes 61 on the filter plate 6 and exposes the water inlet holes 62 on the filter plate 6. The right end of the second water tank 3 starts to intake water, and the left end starts to drain water.

[0046] Continue to refer to Figure 3 and Figure 5 , a backwashing cavity 72 is formed on one side of the stop baffle 7 facing the corresponding filter plate 6, and a pushing structure is arranged between the stop baffle 7 and the filter plate 6. When the stop baffle 7 moves upward along the filter plate 6, the pushing structure pushes the stop baffle 7 to move away from the filter plate 6. When the slider abuts against the top end of the sliding groove 35, the pushing structure pulls the stop baffle 7 to fit on the filter plate 6. The filter holes 61 are located in the backwashing cavity 72, and the backwashing cavity 72 is communicated with the sewage outlet 34. During the process of the stop baffle 7 moving upward relative to the filter plate 6, the pushing structure pushes the stop baffle 7 away from the filter plate 6, which can prevent the impurities attached to the filter plate 6 from being scraped above the stop baffle 7 during the upward movement of the stop baffle 7, facilitating the backwashing cavity 72 to cover the filtered impurities, facilitating the backwashing of impurities and the centralized treatment of impurities.

[0047] As Figures 6 to 8 shown, the backwashing assembly includes a mounting box body 8 and a movable plug 81. The top of the mounting box body 8 is an open structure. A plurality of water storage cavities 82 are arranged in the mounting box body 8 at intervals in the front-rear direction. The movable plug 81 is slidably arranged in the corresponding water storage cavity 82 in the up-down direction, and the bottom of the movable plug 81 is elastically connected to the mounting box body 8 through a first spring 83. As Figure 2 , Figure 3 and Figure 8 shown, the mounting box body 8 is located on one side of the two filter plates 6 facing away from each other. The mounting box body 8 is provided with backwashing holes 84 corresponding to the filter holes 61 and water passing holes 85 corresponding to the water outlet holes 31. As Figure 7 and Figure 8As shown, a water leakage hole 86 is formed in the movable plug 81, and the movable plug 81 is connected with a driving member. The mounting box body 8 and the stop baffle 7 are connected through a portal frame 9.

[0048] As Figures 2 to 4 , Figure 7 and Figure 8 shown, when the stop baffle 7 and the mounting box body 8 are located below the filtering hole 61, the water in the water tank two 3 passes through the filter plate 6 and then enters the mounting box body 8 through the water leakage hole 86, and then enters the water outlet hole 31 through the water passing hole 85 and is discharged. When the connecting member 5 drives the stop baffle 7 to move upward, the stop baffle 7 drives the mounting box body 8 to move upward synchronously through the portal frame 9. The water passing hole 85 on the mounting box body 8 is blocked by the tank wall of the water tank two 3. Part of the cooling water remains in the water storage cavity 82 of the mounting box body 8. When the slider on the stop baffle 7 abuts against the top end of the sliding groove 35 on the water tank two 3, the counter punching hole 84 is aligned with the filtering hole 61, and the driving member drives the movable plug 81 to move downward, squeezing the cooling water in the water storage cavity 82 to perform back flushing on the filtering hole 61.

[0049] A one-way valve (not shown in the figure) is arranged at the water leakage hole 86. The one-way valve allows the cooling water to enter the water storage cavity 82 from the water leakage hole 86. When the driving member drives the movable plug 81 to move downward along the water storage cavity 82, the cooling water in the water storage cavity 82 will not overflow outward from the water leakage hole 86, so as to ensure the effective back flushing of the cooling water on the filtering hole 61.

[0050] As Figure 2 , Figure 3 , Figures 6 to 8 shown, the portal frame 9 includes a frame body one 91 and a frame body two 92. The frame body one 91 and the frame body two 92 are elastically connected in the left-right direction through a spring two. The frame body one 91 is slidably connected with the stop baffle 7 in the front-back direction. The frame body two 92 is slidably connected with the mounting box body 8 in the front-back direction, and an extrusion block 93 is fixedly connected to the bottom of the frame body two 92. The driving member includes a motor 10 and a lead screw 101. The motor 10 is fixedly installed on the water tank two 3. The lead screw 101 is rotatably connected to the water tank two 3 and is in transmission connection with the output end of the motor 10. A movable block 94 is slidably connected to the frame body two 92 in the vertical direction. The movable block 94 is in threaded cooperation with the lead screw 101. Inclined surfaces 87 are respectively arranged on the front and rear sides of the movable plug 81. The motor 10 drives the lead screw 101 to drive the movable block 94 to move in the front-back direction. The movable block 94 drives the portal frame 9 and the extrusion block 93 to move in the front-back direction. The extrusion block 93 drives the movable plug 81 to move downward by extruding the inclined surface 87. Since the movable plug 81 is elastically connected to the bottom of the mounting box body 8, after the movable plug 81 extrudes the cooling water in the water storage cavity 82 for back flushing, the movable plug 81 automatically moves upward and resets under the elastic force of the spring one 83.

[0051] As Figures 3 to 5 , Figure 7 and Figure 9As shown in the figure, the pushing structure includes a pushing block 63 fixedly installed on the filter plate 6. The upper and lower ends of the pushing block 63 are respectively provided with inclined wedge surfaces 64. A pushing groove 73 adapted to the pushing block 63 is formed on the stop baffle 7. When the stop baffle 7 is located below the filter hole 61 of the filter plate 6, the pushing block 63 is located in the pushing groove 73. When the stop baffle 7 moves upward relative to the filter plate 6, the inclined wedge surface 64 at the lower end of the pushing block 63 presses against the pushing groove 73, causing the stop baffle 7 to move away from the filter plate 6, and the second spring between the first frame 91 and the second frame 92 is stretched. When the stop baffle 7 continues to move upward until the bottom of it is located on the inclined wedge surface 64 at the upper end of the pushing block 63, the elastic force of the second spring between the first frame 91 and the second frame 92 pulls the stop baffle 7 to gradually move toward the filter plate 6 until the stop baffle 7 fits on the filter plate 6, and the backwashing cavity 72 covers the filter hole 61. When the movable plug 81 squeezes the cooling water in the water storage cavity 82 to backwash the filter plate 6, the impurities attached to the filter hole 61 are backwashed into the backwashing cavity 72 and discharged from the sewage outlet 34.

[0052] A brush (not shown in the figure) is provided on the side of the first frame 91 facing the filter plate 6. When the stop baffle 7 is located below the filter hole 61 and blocks the water inlet hole 62, and the cooling water in the second water tank 3 is discharged from the filter hole 61 to the first water tank 2, the control motor 10 is controlled to drive the lead screw 101 to drive the movable block 94 to move in the front-rear direction. When the movable block 94 drives the gantry 9 to move in the front-rear direction, the brush on the first frame 91 cleans the impurities on the filter plate 6, preventing the impurities from blocking the filter hole 61 and affecting the smooth discharge of the cooling water in the second water tank 3 into the first water tank 2, thereby avoiding the problem that the cooling water in the second water tank 3 and the first water tank 2 cannot circulate effectively.

[0053] The working principle of a plastic extrusion granulation device of the present invention is as follows: The extruder 1 melts the plastic raw material and extrudes it into a strip of plastic. After the strip of plastic is cooled from right to left through the second water tank 3, it enters the granulator for granulation;

[0054] During the process of cooling the strip of plastic, the automatic telescopic rod 33 cooperates to drive the left and right ends of the second water tank 3 to swing in the up-down direction. When the left end of the second water tank 3 is at the lowest position, the stop baffle 7 at the left end of the second water tank 3 is located below the filter hole 61 on the filter plate 6 and blocks the water inlet hole 62 on the filter plate 6. The water passing hole 85 on the mounting box body 8 at the left end of the second water tank 3 is communicated with the water outlet hole 31 at the left end of the second water tank 3. After the cooling water in the second water tank 3 flows out from the filter hole 61, it enters the water storage cavity 82 through the one-way valve on the movable plug 81, enters the water outlet hole 31 through the water passing hole 85, and finally is discharged into the first water tank 2;

[0055] The right end of the second water tank 3 is at the highest position at this time. The stop baffle 7 at the right end of the second water tank 3 covers the filter holes 61 on the filter plate 6 and exposes the water inlet holes 62 on the filter plate 6. The water pump 4 at the right end of the second water tank 3 pumps the cooling water in the first water tank 2 into the second water tank 3, and the cooling water flows leftward from the water inlet holes 62 on the filter plate 6. Control the motor 10 at the right end of the second water tank 3 to drive the lead screw 101 to drive the movable block 94 to move in the front-rear direction. The movable block 94 drives the gantry 9 and the extrusion block 93 to move in the front-rear direction. The extrusion block 93 drives the movable plug 81 to move downward through the extrusion inclined surface 87. The movable plug 81 squeezes the cooling water in the water storage cavity 82 to backflush the filter holes 61. The impurities and the backflushed cooling water enter the backflush cavity 72 of the stop baffle 7 and flow to the sewage outlet 34 for discharge;

[0056] After an interval of a set time period, control the water pump 4 at the right end of the second water tank 3 to stop working. Control the automatic telescopic rod 33 to drive the left end of the second water tank 3 to swing upward and the right end to swing downward. The stop baffle 7 at the left end of the second water tank 3 first moves upward relative to the filter plate 6 under the drive of the connecting member 5. During the moving process, the pushing structure pushes the stop baffle 7 to move away from the filter plate 6. When the slider on the stop baffle 7 abuts against the top end of the chute 35 on the second water tank 3, the pushing structure pulls the stop baffle 7 to fit on the filter plate 6. The stop baffle 7 exposes the water inlet holes 62 on the filter plate 6. As the automatic telescopic rod 33 continues to drive, the stop baffle 7 drives the left end of the second water tank 3 to move upward to the highest position;

[0057] Control the water pump 4 at the left end of the second water tank 3 to work, pump the cooling water in the first water tank 2 into the second water tank 3, and the cooling water flows rightward through the water inlet holes 62 on the left-end filter plate 6. Control the motor 10 at the left end of the second water tank 3 to work, so that the movable plug 81 squeezes the cooling water downward to backflush the filter holes 61 on the left-end filter plate 6;

[0058] At this time, the right end of the second water tank 3 moves to the lowest position, and the stop baffle 7 at the right end is located below the filter holes 61. After the cooling water in the second water tank 3 is filtered through the filter holes 61, it enters the water storage cavity 82 through the one-way valve on the movable plug 81 and is discharged into the first water tank 2 from the water outlet hole 31 at the right end of the second water tank 3 through the water passing hole 85;

[0059] After an interval of a set time period, control the automatic telescopic rod 33 to drive the left end of the second water tank 3 to swing downward and the right end to swing upward, and so on, to realize the reciprocating swing of the left and right ends of the second water tank 3 in the up-down direction.

[0060] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A plastic extrusion granulation device, comprising an extruder, a cooling mechanism and a pelletizer. The strip-shaped plastic extruded by the extruder passes through the cooling mechanism from right to left. It is characterized in that, The cooling mechanism includes a first water tank, a second water tank disposed above the first water tank, and a driving assembly for driving the left and right ends of the second water tank to swing up and down. The left and right ends of the second water tank are respectively communicated with the first water tank through water pumps, and water outlet holes are respectively formed in the left and right ends of the second water tank; When the driving assembly drives the left end of the second water tank to swing upward and the right end to swing downward, the water pump connected to the left end of the second water tank pumps the cooling water in the first water tank into the second water tank. When the driving assembly drives the right end of the second water tank to swing upward and the left end to swing downward, the water pump connected to the right end of the second water tank pumps the cooling water in the first water tank into the second water tank; The second water tank is rotatably connected to the first water tank. The driving assembly includes automatic telescopic rods disposed on both the left and right sides of the rotational connection between the second water tank and the first water tank. The automatic telescopic rods are fixedly installed on the first water tank, and the driving ends of the automatic telescopic rods are connected to the second water tank through connecting members; Filtering assemblies are respectively disposed at positions near the left and right ends in the second water tank. A backwashing assembly is disposed on the filtering assemblies. A sewage discharge port is formed in the second water tank. The backwashing assembly backwashes the impurities filtered on the filtering assemblies into the sewage discharge port; The filtering assembly includes a filter plate fixedly connected in the second water tank. Filter holes and water inlet holes are formed in the filter plate. When the water pump pumps water into the second water tank, the cooling water enters the second water tank through the water inlet holes. When the left or right end of the second water tank swings downward, the cooling water in the second water tank is filtered by the corresponding filter plate and then discharged into the first water tank through the water outlet holes.

2. The plastic extrusion granulation device according to claim 1, wherein Stop baffles are respectively disposed on one side of the two filter plates in the second water tank facing each other. The stop baffles are slidably connected to the second water tank in the vertical direction and are attached to the corresponding filter plates. A limiting structure is disposed between the stop baffles and the second water tank. The connecting member is rotatably connected to the driving end of the corresponding automatic telescopic rod, and the connecting member is slidably connected to the stop baffle in the left - right direction. When the automatic telescopic rod drives the stop baffle to move upward through the connecting member until the limiting structure takes effect, the stop baffle drives one end of the second water tank to swing upward, and the stop baffle covers the filter holes on the filter plate.

3. The plastic extrusion granulation device according to claim 2, characterized in that, A backwashing cavity is formed on one side of the stop baffle facing the corresponding filter plate, and a pushing structure is disposed between the stop baffle and the filter plate. When the stop baffle moves upward along the filter plate, the pushing structure pushes the stop baffle to move away from the filter plate. When the limiting structure takes effect, the pushing structure pulls the stop baffle to fit on the filter plate. The filter holes are located in the backwashing cavity, and the backwashing cavity is communicated with the sewage discharge port.

4. The plastic extrusion granulation device according to claim 3, characterized in that, The recoil assembly includes a mounting box body with an open top and a movable plug slidably connected vertically within the mounting box body. The mounting box body is located on one side of the two filter plates facing away from each other. The mounting box body is provided with a backflush hole corresponding to the filter hole and a water passage hole corresponding to the water outlet hole. The movable plug is provided with a water leakage hole, and the movable plug is connected with a driving member. The mounting box body is connected with the stop baffle; the water in the second water tank enters the mounting box body through the water leakage hole after being filtered by the filter plate, and enters the water outlet hole through the water passage hole and is discharged. When the stop baffle drives the mounting box body to move upward, the tank wall of the second water tank blocks the water passage hole, and the cooling water remains in the mounting box body. When the limiting structure acts, the backflush hole is aligned with the filter hole, and the driving member drives the movable plug to move downward, squeezing the water in the mounting box body to backflush the filter hole.

5. The plastic extrusion granulation device according to claim 4, characterized in that, A plurality of water storage cavities are spaced apart in the front-rear direction within the mounting box body. The movable plug is slidably arranged vertically within the corresponding water storage cavity, and the bottom of the movable plug is elastically connected with the mounting box body. A one-way valve is arranged at the water leakage hole, and the one-way valve allows the cooling water to enter the water storage cavity through the water leakage hole.

6. The plastic extrusion granulation device according to claim 5, characterized in that, The mounting box body and the stop baffle are connected through a portal frame, and the portal frame is slidably connected with the mounting box body and the stop baffle respectively in the front-rear direction. A pressing block is arranged at the bottom of the portal frame. The driving member includes a motor and a lead screw. The motor is fixedly installed on the second water tank. The lead screw is rotatably connected to the second water tank and is in transmission connection with the output end of the motor. A movable block is slidably connected vertically on the portal frame. The movable block is in threaded cooperation with the lead screw. Inclined surfaces are respectively arranged on the front and rear sides of the movable plug. The motor drives the lead screw to drive the movable block to move in the front-rear direction, and the movable block drives the portal frame and the pressing block to move in the front-rear direction. The pressing block drives the movable plug to move downward by pressing the inclined surface.

7. The plastic extrusion granulation device according to claim 6, characterized in that, The portal frame includes a frame body one and a frame body two elastically connected. The frame body one is slidably connected with the stop baffle, and the frame body two is slidably connected with the mounting box body. The top pushing structure includes a top pushing block fixedly installed on the filter plate. Wedge surfaces are respectively arranged at the upper and lower ends of the top pushing block. A top pushing groove adapted to the top pushing block is arranged on the stop baffle. When the stop baffle moves upward, the lower wedge surface presses the groove surface of the top pushing groove, causing the stop baffle to move away from the filter plate. When the stop baffle passes over the top pushing block, the frame body one drives the stop baffle to fit on the filter plate. The backflush cavity covers the filter hole, and a brush is arranged on one side of the frame body one facing the filter plate.

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