Double-plunger screen changing device

Abstract

The utility model relates to the technical field of plastic production, in particular to a double-plunger screen changer which comprises a screen changer body. The screen exchanger further comprises a material opening, a material conveying channel, plunger bodies, an annular groove and a hydraulic oil cylinder, first mounting grooves are formed in the upper end and the lower end of the right side of the screen exchanger body correspondingly, and the plunger bodies are arranged in the two first mounting grooves correspondingly; through the arrangement of the material port, the material conveying channel, the plunger body, the annular groove and the hydraulic oil cylinder, the hydraulic oil cylinder can drive the plunger body to move left and right, when the plunger body is blocked, the plunger body can be adjusted towards the left side, and at the moment, filtering can be conducted through the plunger body on the other side, so that non-stop screen replacement is achieved, and after the annular groove is cleaned, the material conveying channel is replaced. The annular exhaust groove in the plunger body is adjusted to be slightly larger than the left side of the first mounting groove through the hydraulic oil cylinder, at the moment, plastic can be extruded into the annular groove, when the plastic overflowing from the annular exhaust groove is annular, it is indicated that all air is exhausted, and the phenomenon that air is exhausted incompletely is avoided.

Description

Technical Field

[0001] This utility model relates to the field of plastic production technology, and in particular to a dual-plunger screen changing device. Background Technology

[0002] The dual-plunger screen changing device is a piece of equipment used in high-requirement continuous production processes such as plastic extrusion, granulation, and pipe production. It adopts a dual-plunger, dual-flow-channel design, enabling two filters to operate simultaneously. When a filter needs to be replaced, the filter on one plunger continues to operate while the filter on the other plunger is replaced, thus ensuring the continuity and stability of material flow during production and avoiding production interruptions. This equipment is typically used in applications requiring screen changing without shutting down the system, such as in the production of granulation, PE, PPR, PERT pipes, sheets, plates, cast films, and chemical fiber spinning. It ensures no leakage or seepage under high temperature and pressure, and effectively reduces the pressure on the hydraulic system. Furthermore, the dual-plunger screen changing device features a well-designed sealing structure and optimized material priming and venting functions, reducing pressure fluctuations during screen changing and improving product quality and production continuity.

[0003] Most existing dual-plunger screen changing devices only have one to three vent holes for venting. This can easily lead to a situation where material is discharged from all vent holes, but the internal air is not completely expelled. Air may remain inside the material, which can affect the quality of subsequent product production.

[0004] Therefore, addressing the issue that most existing dual-plunger screen changing devices only have one to three vent holes for venting, which can lead to a situation where material is discharged from all vent holes but internal air is not completely expelled, potentially leaving air inside the material and affecting the quality of subsequent products, a new dual-plunger screen changing device can be designed. This device incorporates a material inlet, a conveying channel, a plunger body, an annular groove, and a hydraulic cylinder. When one side of the plunger body is blocked, the hydraulic cylinder drives the plunger body to move to the left. After the annular groove is cleared, the hydraulic cylinder adjusts the annular venting groove on the plunger body to be slightly larger than the left side of the installation groove. At this point, the plastic can be squeezed into the annular groove. When the plastic overflowing from the annular venting groove forms a ring, it indicates that all air has been expelled, thus avoiding incomplete air expulsion. Utility Model Content

[0005] To overcome the problem that most existing dual-plunger screen changing devices only have one to three vent holes for venting, which easily leads to the phenomenon that when all the material is discharged from the vent holes, the internal air is not completely removed, and the air may remain inside the material, thus affecting the quality of subsequent product production.

[0006] The technical solution of this utility model is as follows: a double plunger screen changing device, including a screen changing device body; it also includes a material inlet, a material conveying channel, a plunger body, an annular groove, and a hydraulic cylinder. The upper and lower right sides of the screen changing device body are each provided with an installation groove. A plunger body is installed inside each of the upper two installation grooves. Material inlets are provided on both the front and rear sides of the screen changing device body. Two material conveying channels are opened at the other end of each material inlet. The other ends of the two material conveying channels are respectively opened on the outer sides of the upper and lower installation grooves. An annular groove is opened on the left outer side of the plunger body. An annular venting groove is opened on the left inner side of the annular groove. Connecting rods are connected to the four corners of the right side of the screen changing device body. An installation plate is connected to the right end of each connecting rod. A hydraulic cylinder is installed on the right side of the installation plate.

[0007] Preferably, the hydraulic cylinder is activated, which drives the plunger body to move left and right, thereby replacing the plunger body. When one side of the plunger body is blocked, the hydraulic cylinder is activated to drive the plunger body to move to the left. At this time, the plunger body can block the material conveying channel on the first mounting groove on that side, and the plastic can be filtered through the plunger body on the other side, thus achieving screen replacement without stopping the machine. After cleaning the annular groove on the plunger body, the hydraulic cylinder is activated to adjust the plunger body to the right, adjusting the annular venting groove to be slightly larger than the left side of the first mounting groove. At this time, the plastic can flow into the annular groove through the material inlet and the material conveying channel. The plastic is squeezed and gradually fills the annular groove, and finally overflows through the annular venting groove. When the overflowing plastic is in the shape of an annular ring, it means that all the air has been removed, and the hydraulic cylinder can be used again to drive the plunger body to completely adjust the annular groove into the interior of the first mounting groove.

[0008] Preferably, a connecting plate is installed on the right side of the plunger body, and the output end of the hydraulic cylinder is installed on the right side of the connecting plate.

[0009] Preferably, the plunger body has a material hopper inside and a discharge channel at the upper end.

[0010] Preferably, the hopper is located inside the annular groove, and the discharge channel is connected to the hopper.

[0011] Preferably, there is a second mounting slot on the inner and outer sides of the first mounting slot, and there are two second mounting slots.

[0012] Preferably, the second mounting groove is located inside the right side of the first mounting groove, and a sealing ring is provided inside the second mounting groove.

[0013] Preferably, mounting holes are provided on both the front and rear sides of the screen changer body, and the mounting holes are located around the material inlet.

[0014] The beneficial effects of this utility model are:

[0015] 1. By setting up a material inlet, conveying channel, plunger body, annular groove, and hydraulic cylinder, the hydraulic cylinder can drive the plunger body to move left and right. When the plunger body is blocked, it can be adjusted to the left. At this time, the filter can be carried out through the plunger body on the other side, thus realizing screen replacement without stopping the machine. After the annular groove is cleaned, the hydraulic cylinder adjusts the annular vent groove on the plunger body to be slightly larger than the left side of the installation groove. At this time, the plastic can be squeezed into the annular groove. When the plastic overflowing from the annular vent groove is in the shape of an annular ring, it means that all the air has been discharged, avoiding the phenomenon of incomplete air discharge. Attached Figure Description

[0016] Figure 1 The diagram shown is a three-dimensional structural schematic of a dual-plunger screen changing device according to this utility model.

[0017] Figure 2 The diagram shown is a three-dimensional cross-sectional view of the screen changer of a dual-plunger screen changing device according to this utility model.

[0018] Figure 3 The diagram shown is a three-dimensional cross-sectional view of the plunger body of a dual-plunger screen changing device according to this utility model.

[0019] Figure 4 The diagram shows a three-dimensional structural representation of the plunger body of a dual-plunger screen changing device according to this utility model. Reference numerals: 1. Screen changing device body; 2. Mounting groove one; 3. Material inlet; 4. Material conveying channel; 5. Plunger body; 6. Annular groove; 7. Connecting rod; 8. Mounting plate; 9. Hydraulic cylinder; 10. Connecting disc; 11. Material bin; 12. Discharge channel; 13. Mounting groove two; 14. Sealing ring; 15. Mounting hole; 16. Annular exhaust groove. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Please see Figures 1-4This utility model provides an embodiment: a double-plunger screen changing device, including a screen changing body 1; it also includes a material inlet 3, a material conveying channel 4, a plunger body 5, an annular groove 6, and a hydraulic cylinder 9. The upper and lower right sides of the screen changing body 1 are provided with mounting grooves 2, and the upper two mounting grooves 2 are each fitted with a plunger body 5. The front and rear sides of the screen changing body 1 are provided with material inlets 3, and the other ends of the material inlets 3 are provided with two material conveying channels 4. The other ends of the two material conveying channels 4 are respectively located inside and outside the upper and lower mounting grooves 2. The left outer side of the plunger body 5 is provided with an annular groove 6, and the left inner side of the annular groove 6 is provided with an annular venting groove 16. Connecting rods 7 are connected to the four corners of the right side of the screen changing body 1, and the right ends of the connecting rods 7 are connected to mounting plates 8. A hydraulic cylinder 9 is installed on the right side of the mounting plate 8. Activating the hydraulic cylinder 9 drives the plunger body 5 to the left and right sides. The plunger body 5 is moved to the right, which allows for the replacement of the plunger body 5. When one side of the plunger body 5 is blocked, the hydraulic cylinder 9 is activated to drive the plunger body 5 to move to the left. At this time, the plunger body 5 can block the material conveying channel 4 on the mounting groove 2 on that side. The plastic can be filtered through the plunger body 5 on the other side, thus achieving screen replacement without stopping the machine. After cleaning the annular groove 6 on the plunger body 5, the hydraulic cylinder 9 is activated to adjust the plunger body 5 to the right, adjusting the annular venting groove 16 to be slightly larger than the left side of the mounting groove 2. At this time, the plastic can flow into the annular groove 6 through the material inlet 3 and the material conveying channel 4. The plastic is squeezed and gradually fills the annular groove 6. Finally, it overflows through the annular venting groove 16. When the overflowing plastic is in the shape of an annular ring, it means that all the air has been removed. The hydraulic cylinder 9 can then drive the plunger body 5 again to completely adjust the annular groove 6 into the interior of the mounting groove 2.

[0022] Please see Figures 1-4 In this embodiment, a connecting plate 10 is installed on the right side of the plunger body 5, and the output end of the hydraulic cylinder 9 is installed on the right side of the connecting plate 10. A material hopper 11 is opened inside the plunger body 5, and a discharge channel 12 is opened at the upper end of the plunger body 5. The material hopper 11 is located inside the annular groove 6, and the discharge channel 12 communicates with the material hopper 11. A filter hole is provided on the annular groove 6. The plastic filtered by the annular groove 6 can enter the interior of the material hopper 11, and then be discharged to the next process through the discharge channel 12. The setting of the connecting plate 10 facilitates the installation between the plunger body 5 and the hydraulic cylinder 9.

[0023] Please see Figure 3 In this embodiment, there are two mounting grooves 13 on the inner and outer sides of the mounting groove 1 2. The mounting groove 13 is located on the inner right side of the mounting groove 1 2. A sealing ring 14 is provided inside the mounting groove 13. The mounting groove 13 facilitates the installation of the sealing ring 14. The sealing ring 14 can seal the plunger body 5.

[0024] Please see Figure 1 In this embodiment, mounting holes 15 are provided on both the front and rear sides of the screen changer body 1. The mounting holes 15 are located around the material inlet 3. The opening of the mounting holes 15 facilitates the connection between the screen changer body 1 and the feeding and discharging mechanism.

[0025] During operation, plastic flows through the feed inlet 3 and conveying channel 4 on one side into the annular groove 6 on the plunger body 5. After being filtered by the filter holes on the annular groove 6, the plastic enters the hopper 11 and is finally discharged through the discharge channel 12. When one side of the plunger body 5 is blocked, the hydraulic cylinder 9 is activated to drive the plunger body 5 to move to the left. At this time, the plunger body 5 can block the conveying channel 4 on the mounting groove 2 on that side, and the plastic can be filtered through the plunger body 5 on the other side, thus achieving screen replacement without stopping the machine. After cleaning the groove 6, start the hydraulic cylinder 9 to adjust the plunger body 5 to the right, and adjust the annular vent groove 16 to be slightly larger than the left side of the installation groove 2. At this time, the plastic can flow into the annular groove 6 through the material port 3 and the material conveying channel 4. The plastic is squeezed and can gradually fill the annular groove 6. Finally, it overflows through the annular vent groove 16. When the overflowing plastic is in the shape of an annular ring, it means that all the air has been discharged. Then, the hydraulic cylinder 9 can drive the plunger body 5 to adjust the annular vent groove 16 completely into the interior of the installation groove 2 for production operation.

[0026] Through the above steps, by setting up the material inlet 3, the material conveying channel 4, the plunger body 5, the annular groove 6, and the hydraulic cylinder 9, when one side of the plunger body 5 is blocked, the hydraulic cylinder 9 can drive the plunger body 5 to move to the left. After the annular groove 6 is cleaned, the hydraulic cylinder 9 adjusts the annular venting groove 16 on the plunger body 5 to be slightly larger than the left side of the installation groove 2. At this time, the plastic can be squeezed into the annular groove 6. When the plastic overflowing from the annular venting groove 16 is in the shape of an annular ring, it indicates that all the air has been discharged, thus avoiding the phenomenon of incomplete air discharge. This solves the problem that most existing double plunger screen changing devices only open one to three venting holes for venting, which easily leads to the phenomenon that when all the material is discharged from the venting holes, the internal air is still not completely discharged. The air may remain inside the material, which will affect the quality of subsequent product production.

Claims

1. A dual-plunger screen changing device, comprising a screen changing body (1); characterized in that: It also includes a material inlet (3), a material conveying channel (4), a plunger body (5), an annular groove (6), and a hydraulic cylinder (9). The upper and lower ends of the right side of the screen changer body (1) are provided with mounting slots (2). The upper two mounting slots (2) are provided with plunger bodies (5). The front and rear sides of the screen changer body (1) are provided with material inlets (3). The other end of the material inlets (3) is provided with two material conveying channels (4). The other ends of the two material conveying channels (4) are respectively provided on the inner and outer sides of the upper and lower mounting slots (2). The left side of the plunger body (5) is provided with an annular groove (6). The left side of the annular groove (6) is provided with an annular exhaust groove (16). The four corners of the right side of the screen changer body (1) are connected with connecting rods (7). The right end of the connecting rods (7) is connected with a mounting plate (8). The right side of the mounting plate (8) is provided with a hydraulic cylinder (9).

2. The dual-plunger screen changing device according to claim 1, characterized in that: A connecting plate (10) is installed on the right side of the plunger body (5), and the output end of the hydraulic cylinder (9) is installed on the right side of the connecting plate (10).

3. The dual-plunger screen changing device according to claim 1, characterized in that: The plunger body (5) has a material hopper (11) inside and a discharge channel (12) at the upper end of the plunger body (5).

4. The dual-plunger screen changing device according to claim 3, characterized in that: The hopper (11) is located inside the annular groove (6), and the discharge channel (12) is connected to the hopper (11).

5. The dual-plunger screen changing device according to claim 1, characterized in that: There are two mounting slots (13) on the inner and outer sides of mounting slot 1 (2).

6. A dual-plunger screen changing device according to claim 5, characterized in that: Mounting slot 2 (13) is located inside the right side of mounting slot 1 (2), and a sealing ring (14) is provided inside mounting slot 2 (13).

7. The dual-plunger screen changing device according to claim 1, characterized in that: The screen changer body (1) has mounting holes (15) on both the front and rear sides, and the mounting holes (15) are located around the feed inlet (3).

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