Internal and external circulation device of screw extruder

Abstract

The utility model relates to the technical field of screw extruders, in particular to an internal and external circulation device of a screw extruder, which comprises an extruder, a cooling pipe is arranged in the middle of the inside of the extruder, a cleaning piece is arranged in the middle of the cooling pipe and used for cleaning the cooling pipe, and a filter piece is arranged on the lower portion of the cooling pipe and used for filtering the cooling pipe. The internal and external circulation device comprises a cooling pipe and a cleaning part, the cooling pipe is arranged in the middle of the cooling pipe and used for containing and filtering cooling liquid, the cleaning part comprises a pipeline arranged in the middle of the cooling pipe, filtering holes are formed in the front end and the rear end of the pipeline, a plurality of evenly-distributed cleaning beads are slidably connected to the interior of the pipeline, and an electromagnetic valve is arranged on the left portion of the pipeline. The cleaning beads are pushed to the cooling pipe along the pipeline under the pressure of the cleaning liquid and then enter the pipeline again, scale on the inner wall of the cooling pipe can be rubbed and cleaned away when the cleaning beads move, the scale is pushed by the cooling liquid to pass through the filter holes and then enter the storage box, and therefore the function of cleaning the cooling pipe can be achieved.

Description

Technical Field

[0001] This utility model relates to the field of screw extruder technology, specifically to an internal and external circulation device for a screw extruder. Background Technology

[0002] The internal and external circulation device for screw extruders is an auxiliary device used in screw extruder production. The internal circulation device can make the material mix more evenly, while the external circulation device can keep the material at a suitable temperature.

[0003] The internal circulation device, based on the special design of the screw and barrel, allows the material to circulate within the extruder, ensuring uniform distribution of each component. The external circulation device, consisting of pipes, a circulating pump, and a heat exchanger, is connected to the extruder through various connection methods, which can prevent overheating degradation or ensure a suitable plasticizing temperature.

[0004] After long-term use, existing external circulation devices accumulate a large amount of scale on the inner wall of their pipes. This scale reduces the heat exchange efficiency of the pipes. Existing devices use chemical methods to clean the inner wall of the pipes, which requires shutdown and replacement of coolant. This increases the complexity of pipe cleaning and leads to long-term machine downtime. To address this, we propose an internal and external circulation device for screw extruders. Utility Model Content

[0005] One of the technical problems this application aims to solve is that chemical cleaning of the inner wall of pipes increases the complexity of pipe cleaning and leads to long-term machine downtime.

[0006] To solve the above-mentioned technical problems, this application provides an internal and external circulation device for a screw extruder, including an extruder, a cooling pipe is provided in the middle of the extruder, a cleaning component is provided in the middle of the cooling pipe for cleaning the cooling pipe, and a filter component is provided at the lower part of the cooling pipe for holding and filtering coolant.

[0007] Preferably, the cleaning component includes a pipe disposed in the middle of the cooling pipe, with filter holes at both ends of the pipe, and multiple evenly distributed cleaning beads slidably connected inside the pipe, a solenoid valve disposed on the left side of the pipe, and a working component disposed in the middle of the pipe for driving the cleaning beads to move, wherein the diameter of the cleaning beads is the same as the inner diameter of the cooling pipe.

[0008] Preferably, the working part includes a protective shell disposed in the middle of the pipe, with two evenly distributed drive blocks rotatably connected to the inner center of the protective shell, and a drive member disposed at the front of the protective shell for driving the drive blocks to rotate.

[0009] Preferably, the spacing between the two drive blocks is consistent with the diameter of the cleaning bead.

[0010] Preferably, the driving component includes a motor disposed at the lower front part of the protective shell, the driving end of the motor being disposed at the front part of the lower driving block, and a gear being disposed at the rear part of the driving block, with the two gears meshing with each other.

[0011] Preferably, the filter element includes a storage box disposed at the lower part of the cooling pipe, a water pump disposed at the lower rear part of the cooling pipe, a filter box slidably connected inside the storage box, a handle disposed at the front part of the filter box, a cooler disposed at the rear part of the storage box, the input end of the cooler disposed at the left rear part of the storage box, and the output end of the cooler disposed at the right rear part of the storage box.

[0012] Preferably, a pin is slidably connected to the front interior of the storage box, a limiting plate is provided on the upper part of the pin, a spring is sleeved on the outer periphery of the middle part of the pin, a sliding groove is opened in the middle of the interior of the storage box, the limiting plate slides inside the sliding groove, the upper end of the spring abuts against the lower part of the limiting plate, and the lower end of the spring abuts against the interior of the sliding groove.

[0013] This utility model has at least the following beneficial effects:

[0014] 1. Through the cooperation between the motor, two drive blocks and two gears, the two drive blocks can maintain the same speed and control the number and spacing of cleaning beads passing through the protective shell. Under the pressure of the cleaning fluid, the cleaning beads are pushed through the solenoid valve and along the pipeline to the cooling pipe, and then re-enter the movement trajectory of the pipeline. During the movement of the cleaning beads, the cleaning beads will rub and clean the scale on the inner wall of the cooling pipe, and then be pushed by the coolant through the filter holes and then into the interior of the storage tank, thereby realizing the function of cleaning the cooling pipe.

[0015] 2. The water pump draws coolant from inside the storage tank and flows it back into the storage tank through the cooling pipe. As the coolant flows, it carries away some of the heat generated by the extruder. Scale is pushed by the coolant through the filter holes and into the storage tank. The scale particles are filtered out by the filter box, and the coolant can flow into the lower part of the storage tank through the filter box, thus realizing the function of coolant circulation and filtration. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the cooling pipe structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the pipeline structure of this utility model;

[0019] Figure 4This is a schematic diagram of the protective shell structure of this utility model;

[0020] Figure 5 This is a schematic diagram of the storage box structure of this utility model;

[0021] Figure 6 This is a schematic diagram of the structure of Embodiment 2 of this utility model.

[0022] In the diagram: 1. Extruder; 2. Cooling pipe; 3. Cleaning component; 31. Pipe; 32. Filter hole; 33. Solenoid valve; 34. Cleaning bead; 4. Working component; 41. Protective shell; 42. Drive block; 5. Drive component; 51. Motor; 52. Gear; 6. Filter component; 61. Water pump; 62. Storage box; 63. Filter box; 64. Handle; 65. Cooler; 66. Pin; 67. Limiting plate; 68. Spring; 69. Slide groove. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1: Please refer to Figure 1-5 This utility model provides a technical solution: an internal and external circulation device for a screw extruder, including an extruder 1, a cooling pipe 2 is provided in the middle of the extruder 1, a cleaning component 3 is provided in the middle of the cooling pipe 2 for cleaning the cooling pipe 2, and a filter component 6 is provided at the lower part of the cooling pipe 2 for holding and filtering coolant.

[0025] Cooling pipe 2 can provide cooling for extruder 1.

[0026] Furthermore, the cleaning component 3 includes a pipe 31 located in the middle of the cooling pipe 2. Filter holes 32 are provided at both ends of the pipe 31. Multiple evenly distributed cleaning beads 34 are slidably connected inside the pipe 31. A solenoid valve 33 is provided on the left side of the pipe 31. A working component 4 is provided in the middle of the pipe 31 to drive the cleaning beads 34 to move. The diameter of the cleaning beads 34 is the same as the inner diameter of the cooling pipe 2.

[0027] Pipe 31 provides temporary storage space for cleaning beads 34 and allows cleaning beads 34 to circulate along the passage from cooling pipe 2 to pipe 31. Solenoid valve 33 provides access to close and open pipe 31. Filter orifice 32 prevents cleaning beads 34 from leaving the passage from cooling pipe 2 to pipe 31 and provides space for the flow of coolant and impurities. Cleaning beads 34 can circulate within the internal passage from cooling pipe 2 to pipe 31. During movement, cleaning beads 34 can rub and scrape away solid condensate from the inner wall of cooling pipe 2.

[0028] Furthermore, the working part 4 includes a protective shell 41 disposed in the middle of the pipe 31. Two evenly distributed drive blocks 42 are rotatably connected in the middle of the interior of the protective shell 41. A drive member 5 is disposed at the front of the protective shell 41 for driving the drive blocks 42 to rotate.

[0029] The protective shell 41 can protect the internal structure from external interference, and the drive block 42 can keep the number and time interval of the cleaning beads 34 passing through the protective shell 41 constant, preventing the cleaning beads 34 from getting too close to each other, which would cause the passage to be blocked and collisions to occur.

[0030] Furthermore, the spacing between the two drive blocks 42 is consistent with the diameter of the cleaning bead 34.

[0031] Furthermore, the driving component 5 includes a motor 51 located at the lower front part of the protective shell 41, the driving end of the motor 51 is located at the front part of the lower driving block 42, and a gear 52 is located at the rear part of the driving block 42, with the two gears 52 meshing with each other.

[0032] The motor 51 can drive the lower drive block 42 and gear 52 to rotate. The rotation of the lower gear 52 can drive the upper gear 52 and drive block 42 to rotate, so that the two drive blocks 42 rotate at the same speed.

[0033] Furthermore, the filter element 6 includes a storage box 62 located at the lower part of the cooling pipe 2, a water pump 61 located at the lower rear part of the cooling pipe 2, a filter box 63 slidably connected inside the storage box 62, a handle 64 located at the front of the filter box 63, a cooler 65 located at the rear of the storage box 62, an input end of the cooler 65 located at the rear left side of the storage box 62, and an output end of the cooler 65 located at the rear right side of the storage box 62.

[0034] The water pump 61 can draw coolant from the inside of the storage tank 62 and move it along the cooling pipe 2. The storage tank 62 can provide a space for storing and filtering coolant. The filter box 63 can filter solid particles in the coolant. The handle 64 can pull out the filter box 63 to clean solid particles. The cooler 65 can reduce the temperature of the coolant and prevent the coolant from overheating.

[0035] When the extruder 1 is running, the water pump 61 and cooler 65 will also start. The water pump 61 can draw coolant from the storage tank 62, pass it through the cooling pipe 2, and then flow back into the storage tank 62. As the coolant flows, it carries away some of the heat generated by the extruder 1, thus preventing overheating. The cooler 65 lowers the temperature of the coolant. To prevent excessive scale buildup on the inner wall of the cooling pipe 2, which would reduce its heat exchange efficiency, the inner wall of the cooling pipe 2 needs to be cleaned regularly. After the extruder 1 stops running, the cooling system of the device is kept running. Then, the motor 51 is started and the solenoid valve 33 is opened. At this time, the motor 51 drives the lower drive block 42 and gear 52 to rotate. The lower gear 52 drives the upper gear 52 to rotate, and the upper gear 52 drives the upper protection... The housing 41 rotates, thereby keeping the two drive blocks 42 at the same speed. At this time, under the pressure of the cleaning fluid, the cleaning beads 34 are pushed towards the solenoid valve 33. The two drive blocks 42 can control the number and spacing of the cleaning beads 34 passing through the protective housing 41. The cleaning beads 34 pass through the solenoid valve 33 and move along the pipe 31 to the cooling pipe 2, and then re-enter the interior of the pipe 31. During the movement of the cleaning beads 34, the cleaning beads 34 will rub away the scale on the inner wall of the cooling pipe 2, and then be pushed by the coolant through the filter hole 32 and into the interior of the storage tank 62. This can realize the cleaning function of the cooling pipe 2. The scale particles will be filtered out by the filter box 63, and the coolant can flow into the lower part of the storage tank 62 through the filter box 63, thereby realizing the circulation and filtration function of the coolant.

[0036] Example 2: Please refer to Figure 6 Based on Embodiment 1, this utility model provides another technical solution: a pin 66 is slidably connected inside the front part of the storage box 62, a limiting plate 67 is provided on the upper part of the pin 66, a spring 68 is sleeved on the outer periphery of the middle part of the pin 66, a sliding groove 69 is opened in the middle of the storage box 62, the limiting plate 67 slides inside the sliding groove 69, the upper end of the spring 68 abuts against the lower part of the limiting plate 67, and the lower end of the spring 68 abuts against the inside of the sliding groove 69;

[0037] The pin 66 can lock the position of the filter box 63. The spring 68 can push the limiting plate 67 to move upward. The limiting plate 67 can push the pin 66 to abut against the lower part of the filter box 63. The slide groove 69 provides movement space for the pin 66, the limiting plate 67 and the spring 68. When the pin 66 abuts against the lower part of the filter box 63, it can prevent the filter box 63 from being accidentally pulled out. Only after the pin 66 is pushed downward to move downward, the pin 66 drives the limiting plate 67 to move downward. The pin 66 releases the lock on the filter box 63. The limiting plate 67 can squeeze the spring 68 to retract. Only then can the handle 64 be pulled to take out the filter box 63 for cleaning.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A screw extruder internal and external circulation device comprising an extruder (1) characterized by: The middle part of the interior of the extruder (1) is provided with a cooling pipe (2), the middle part of the cooling pipe (2) is provided with a cleaning piece (3) for cleaning the cooling pipe (2), and the lower part of the cooling pipe (2) is provided with a filtering piece (6) for containing and filtering the cooling liquid.

2. The screw extruder internal / external circulation device of claim 1, wherein: The cleaning piece (3) comprises a pipe (31) arranged in the middle part of the cooling pipe (2), the front and rear ends of the pipe (31) are provided with filter holes (32), the inside of the pipe (31) is slidably connected with a plurality of cleaning beads (34) uniformly distributed, the left part of the pipe (31) is provided with an electromagnetic valve (33), the middle part of the pipe (31) is provided with a working piece (4) for driving the cleaning beads (34) to move, and the diameter of the cleaning beads (34) is consistent with the inner diameter of the cooling pipe (2).

3. The screw extruder internal / external circulation device of claim 2, wherein: The working piece (4) comprises a protection shell (41) arranged in the middle part of the pipe (31), the inside of the protection shell (41) is rotatably connected with two driving blocks (42) uniformly distributed, and the front part of the protection shell (41) is provided with a driving piece (5) for driving the driving blocks (42) to rotate.

4. The screw extruder internal / external circulation apparatus of claim 3, wherein: The distance between the two driving blocks (42) is consistent with the diameter of the cleaning beads (34).

5. The screw extruder internal / external circulation apparatus of claim 3, wherein: The driving piece (5) comprises a motor (51) arranged in the front lower part of the protection shell (41), the driving end of the motor (51) is arranged in the front part of the lower driving block (42), the rear part of the driving block (42) is provided with a gear (52), and the two gears (52) are meshed with each other.

6. The screw extruder internal / external circulation apparatus of claim 1 wherein: The filtering piece (6) comprises a storage box (62) arranged in the lower part of the cooling pipe (2), the rear lower part of the cooling pipe (2) is provided with a water pump (61), the inside of the storage box (62) is slidably connected with a filter box (63), the front part of the filter box (63) is provided with a handle (64), the rear part of the storage box (62) is provided with a cooler (65), the input end of the cooler (65) is arranged at the rear left side of the storage box (62), and the output end of the cooler (65) is arranged at the rear right side of the storage box (62).

7. The screw extruder internal / external circulation apparatus of claim 6, wherein: The front inside of the storage box (62) is slidably connected with a latch (66), the upper part of the latch (66) is provided with a limiting plate (67), the middle part of the latch (66) is sleeved with a spring (68) on the outer periphery, the inside of the middle part of the storage box (62) is provided with a sliding groove (69), the limiting plate (67) slides in the inside of the sliding groove (69), the upper end of the spring (68) abuts against the lower part of the limiting plate (67), and the lower end of the spring (68) abuts against the inside of the sliding groove (69).

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