Quick die screen changing and self-cleaning device

Abstract

The utility model is suitable for mould head technical field provides mould head quick screen change self -cleaning device, its mould head body has through installation chamber, built -in coaxial fixed installation carrier, and the carrier side wall opens two groups of parallel limit guide slot, main filter screen, spare filter screen sliding fit among them, all are board -like and with guide rail contact; The mould head body top is equipped with electric push rod, and the movable rod is connected with the receiving plate, and the receiving plate both sides extend fixed block, its abutting face fixed heating type blow head, this device is equipped with main, spare filter screen in installation carrier, and the main filter screen can quickly use the spare filter screen when it is out of order, guarantees the continuous stability of production, avoids single filter screen damage and causes production stagnation, quality fluctuation, and can clean different side edge filter screen flexibly, simplifies the impurity cleaning procedure, improves the cleaning efficiency, reduces the operator's burden, and improves the equipment maintenance efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of mold head technology, and in particular relates to a quick screen replacement and self-cleaning device for mold heads. Background Technology

[0002] In traditional die-head filtration technology applications, only a single filter screen is typically used. During long-term production operations, impurities in the material continuously accumulate on the filter screen surface. As the amount of impurities increases, the filtration efficiency of the filter screen gradually decreases, and in severe cases, it can even lead to filter screen damage. Once the filter screen malfunctions, the entire production process must be interrupted due to the lack of backup plans to replace or repair the filter screen. Such production interruptions not only waste time and increase production costs but may also affect the overall operational efficiency of the enterprise due to disruptions in production plans, resulting in economic losses. For example, in some continuous production chemical enterprises, production line shutdowns can lead to a series of problems such as waste of raw materials, increased product defect rates, and delayed order delivery.

[0003] Traditional cleaning methods for filter screens are often cumbersome, requiring operators to manually disassemble the filter screen for cleaning. This cleaning method is not only complicated and time-consuming, but also difficult to guarantee the cleaning effect. Furthermore, the process of disassembling and installing the filter screen can easily damage it, affecting its service life.

[0004] Furthermore, due to the inconvenience of the cleaning process, operators may extend the cleaning cycle of the filter screen in order to reduce workload, resulting in excessive accumulation of impurities on the filter screen, which further affects the filtration effect and production quality. For example, in some plastic extrusion molding industries, traditional filter screen cleaning methods result in low maintenance efficiency of production equipment and make it difficult to effectively control the quality stability of products. Utility Model Content

[0005] This utility model provides a quick-change self-cleaning device for the die head, which aims to solve the problems of existing die head filtration technology that is equipped with only a single filter screen, which is prone to reduced filtration effect and damage due to the accumulation of impurities, leading to production interruption, wasted time, increased costs and reduced operating efficiency, and other economic losses; in addition, its filter screen cleaning method is cumbersome, time-consuming and labor-intensive, the effect is not guaranteed, and it is also easy to damage the filter screen.

[0006] This utility model is implemented as follows: a quick-change self-cleaning device for the die head, comprising:

[0007] The mold head body has a through mounting chamber inside for installing the filter unit;

[0008] The filter unit includes:

[0009] The mounting carrier is coaxially arranged with the mold head body and fixed in the mounting cavity; the side wall of the mounting carrier has two sets of parallel and spaced limiting guide grooves along the axial direction, each set of limiting guide grooves is limited by two opposite groove walls, and the inner surface of the groove wall is provided with guide rails.

[0010] The main filter and the backup filter are slidably fitted into two sets of limiting guide grooves; both the main filter and the backup filter are plate-shaped structures, and their two sides are in sliding contact with the guide rails of the corresponding limiting guide grooves.

[0011] An electric push rod is located on the top of the die head body. Its fixed end is fixedly connected to the die head body through a mounting base, and the free end of the movable rod passes through the side wall of the die head body and is fixedly connected to the receiving plate.

[0012] The receiving plate is located between the mounting carrier and the electric push rod, with fixing blocks extending from both sides of it;

[0013] The heated nozzle is fixed to the contact surface of the fixed block, and the heated nozzle is positioned opposite to the surfaces of the main filter and the spare filter.

[0014] Preferably, two sets of rectangular limiting grooves are provided at the bottom of the mounting carrier, and limiting protrusions are provided on one side of the limiting grooves corresponding to the bottom of the main filter and the spare filter.

[0015] Preferably, a set of mounting grooves is opened through the top of the mold head body, the main filter and the spare filter extend to the outside of the mounting grooves, and a handle is provided at the extended end.

[0016] Preferably, a through hole is provided on the outer groove bottom of the die head body near the main filter screen, and the through hole communicates with the bottom of the die head body; a sealing cap is threaded onto the bottom of the die head body.

[0017] Preferably, a sealing sleeve is provided between the movable rod of the electric push rod and the side wall of the mold head body, and the sealing sleeve is made of a certain material.

[0018] Preferably, the fixing block and the receiving plate are fixed by vulcanization bonding, and the thickness of the fixing block is greater than that of the main filter screen and the spare filter screen, and there is an movable gap between the main filter screen and the spare filter screen and the installation carrier.

[0019] Preferably, the filter holes of the main filter and the backup filter have a gradient structure, with the diameter of the filter holes near the inlet side of the installation chamber being larger than that of the outlet side.

[0020] Preferably, it also includes a pressure sensor and a controller; the pressure sensor is located on the upstream side of the mounting chamber near the main filter screen, and the controller is located on the outside of the mold head body, and the controller is electrically connected to the pressure sensor and the electric push rod.

[0021] Compared with the prior art, the embodiments of this application have the following main advantages:

[0022] Firstly, this device is equipped with a main filter and a backup filter inside the mounting carrier. When the main filter is damaged or its filtration effect is severely reduced due to prolonged use, accumulation of impurities, or other reasons, the backup filter can be quickly activated. This ensures that the production process is not affected, maintains the continuity and stability of production, and avoids inconveniences such as production stoppages and product quality fluctuations that may be caused by the damage of a single filter. At the same time, this device is equipped with a height-adjustable heated spray head. By adjusting the height of the heated spray head, the main filter and the backup filter at different positions on different sides of the mounting carrier can be effectively cleaned.

[0023] Secondly, this device simplifies the operation steps for cleaning impurities, making the cleaning process more convenient and efficient; on the other hand, it greatly reduces the workload of operators and ultimately improves the maintenance efficiency of the equipment. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0025] Figure 2 This is a three-dimensional structural schematic diagram of the present invention;

[0026] Figure 3 This is a front sectional view of the structure of this utility model;

[0027] Figure 4 This is a top view structural diagram of this utility model;

[0028] Figure 5 This is a front structural diagram of the present invention;

[0029] In the diagram: 1. Mold head body; 2. Mounting carrier; 3. Limiting guide groove; 4. Guide rail; 5. Main filter screen; 6. Spare filter screen; 7. Electric push rod; 8. Receiving plate; 9. Fixing block; 10. Heated blow nozzle; 11. Limiting groove; 12. Limiting protrusion; 13. Mounting groove; 14. Handle; 15. Through hole; 16. Sealing cap; 17. Sealing sleeve; 18. Pressure sensor; 19. Controller. Detailed Implementation

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0031] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0032] This utility model embodiment provides a quick screen replacement and self-cleaning device for the die head, such as... Figure 1-5 As shown, the mold head body 1 has a through mounting chamber inside for installing the filter unit;

[0033] The filter unit includes:

[0034] The mounting carrier 2 is coaxially arranged with the mold head body 1 and fixed in the mounting cavity; the side wall of the mounting carrier 2 has two sets of parallel and spaced limiting guide grooves 3 along the axial direction, each set of limiting guide grooves 3 is limited by two opposite groove walls, and the inner surface of the groove wall is provided with guide rails 4.

[0035] The main filter 5 and the spare filter 6 are slidably fitted into two sets of limiting guide grooves 3 respectively; both the main filter 5 and the spare filter 6 are plate-shaped structures, and their two sides are in sliding contact with the guide rails 4 of the corresponding limiting guide grooves 3.

[0036] An electric push rod 7 is located on the top of the mold head body 1. Its fixed end is fixedly connected to the mold head body 1 through a mounting base, and the free end of the movable rod passes through the side wall of the mold head body 1 and is fixedly connected to the receiving plate 8.

[0037] The receiving plate 8 is located between the mounting carrier 2 and the electric push rod 7, with fixing blocks 9 extending from both sides of it; the fixing blocks 9 are made of material;

[0038] The heated nozzle 10 is fixed on the abutting surface of the fixing block 9, and the heated nozzle 10 is arranged opposite to the surfaces of the main filter screen 5 and the spare filter screen 6.

[0039] It should be noted that existing mold head filtration technology is equipped with only a single filter screen, which is prone to reduced filtration efficiency and damage due to impurity accumulation, leading to production interruptions, wasted time, increased costs, and reduced operational efficiency. Furthermore, its filter screen cleaning method is cumbersome, time-consuming, labor-intensive, and its effectiveness is unpredictable, and it is also prone to damaging the filter screen. This solution incorporates main and backup filters 6 inside the mounting carrier 2. When the main filter screen 5 malfunctions, the backup filter screen 6 can be quickly activated, ensuring continuous and stable production and avoiding the inconvenience of production stoppages and product quality fluctuations caused by the damage of a single filter screen. Simultaneously, it is equipped with an adjustable-height heated blower head, which can flexibly clean filters at different side positions, and simplifies the impurity cleaning process, making cleaning more convenient and efficient, reducing the workload of operators, and improving equipment maintenance efficiency.

[0040] Specifically, in this embodiment, the solution mainly includes a die head body 1. During normal production, the main filter screen 5 is in the working position to filter the material flowing through the die head. As the usage time increases, more impurities will gradually adhere to the surface of the main filter screen 5, resulting in a decrease in the filtration effect. At this time, if it is necessary to clean the main filter screen 5, the electric push rod 7 set on the top of the die head body 1 can be activated.

[0041] After the electric push rod 7 is started, its movable rod will extend outward or retract inward, thereby driving the support plate 8 fixedly connected to it to move; the fixed blocks 9 extending from both sides of the support plate 8 will also move synchronously; since the heated blow head 10 is fixed on the abutting surface of the fixed block 9, during the movement of the support plate 8, the heated blow head 10 will blow along the surface of the filter screen, thereby effectively removing impurities on the filter screen and realizing the self-cleaning function;

[0042] If it is determined that the main filter 5 can no longer restore its filtration effect through cleaning and needs to be replaced, the main filter 5 can be slid upward along the corresponding limiting guide groove 3 on the side wall of the mounting carrier 2 and moved out of the mounting chamber; at the same time, the spare filter 6, which was originally in the standby position, is slid along another set of limiting guide grooves 3 to the original working position of the main filter 5, so as to quickly complete the switching between the main filter 5 and the spare filter 6, thereby ensuring the continuity and stability of production.

[0043] In a further preferred embodiment of this utility model, such as Figure 3 As shown, two sets of rectangular limiting grooves 11 are provided at the bottom of the mounting carrier 2, and limiting protrusions 12 are provided on one side of the bottom of the main filter screen 5 and the spare filter screen 6 corresponding to the limiting grooves 11.

[0044] In this embodiment, the limiting protrusion 12 is precisely embedded in the limiting groove 11 at the bottom of the mounting carrier 2. The cooperation between the limiting protrusion 12 and the limiting groove 11 ensures the accuracy of the spare filter 6 during movement and positioning, quickly completing the switching between the main filter 5 and the spare filter 6, and ensuring the continuity and stability of production.

[0045] In a further preferred embodiment of this utility model, such as Figure 1-2 As shown, a set of mounting grooves 13 are opened through the top of the mold head body 1, the main filter screen 5 and the spare filter screen 6 extend to the outside of the mounting grooves 13, and a handle 14 is provided at the extended end.

[0046] In this embodiment, the operator can use the handle 14 at the extended end to pull upwards, causing the limiting protrusion 12 to slide upwards along the rectangular limiting groove 11 at the bottom of the mounting carrier 2, and smoothly move it out of the mounting chamber; then, by holding the handle 14 at the extended end of the spare filter 6, the operator can slide the spare filter 6 downwards along the limiting guide groove 3 on the side wall of the mounting carrier 2, so that its bottom limiting protrusion 12 is precisely embedded in the rectangular limiting groove 11 at the corresponding working position at the bottom of the mounting carrier 2, quickly completing the switching between the main filter 5 and the spare filter 6, and ensuring continuous and stable production.

[0047] In a further preferred embodiment of this utility model, such as Figure 3 As shown, a through hole 15 is provided on the bottom of the outer groove of the mold head body 1 near the main filter screen 5, and the through hole 15 is connected to the bottom of the mold head body 1; a sealing cap 16 is threadedly fitted to the bottom of the mold head body 1.

[0048] In this embodiment, when cleaning impurities, the operator can slowly loosen the sealing cap 16 at the bottom of the die head body 1, so that the impurities accumulated near the through hole 15 can be discharged outside the installation chamber through the through hole 15 under the action of gravity, and discharged from the die head body 1 through the loosened sealing cap 16. After cleaning, the sealing cap 16 is tightened again to ensure the sealing of the die head body 1.

[0049] In a further preferred embodiment of this utility model, such as Figure 3 As shown, a sealing sleeve 17 is provided between the movable rod of the electric push rod 7 and the side wall of the mold head body 1. The sealing sleeve 17 is made of material.

[0050] In this embodiment, during the movement of the movable rod, the sealing sleeve 17, with its good elasticity and flexibility, can deform with the extension and retraction of the movable rod, always tightly wrapping the movable rod and maintaining a good fit with the movable rod and the side wall of the mold head body 1. In this way, whether the movable rod is extended or retracted, the sealing sleeve 17 can effectively seal the gap between the movable rod and the side wall, preventing leakage of internal materials or entry of external impurities due to the movement of the movable rod when cleaning the filter screen, ensuring that the cleaning process is carried out in a stable environment without affecting the cleaning effect and normal operation of the mold head.

[0051] In a further preferred embodiment of this utility model, such as Figure 3 As shown, the fixing block 9 and the receiving plate 8 are fixed by vulcanization bonding, and the thickness of the fixing block 9 is greater than that of the main filter screen 5 and the spare filter screen 6, and there is an movable gap between the main filter screen 5 and the spare filter screen 6 and the mounting carrier 2.

[0052] In this embodiment, the heated blower head 10, under the action of the fixing block 9, can thoroughly and effectively clean the surface of the filter screen, brushing off impurities. Furthermore, during the cleaning process, the movable gap between the filter screen and the mounting carrier 2 allows the filter screen to experience slight shaking or displacement under the action of the heated blower head 10. This slight movement helps the heated blower head 10 to more deeply remove impurities from the filter screen surface, improving the cleaning effect and preventing the heated blower head 10 from applying excessive pressure to the filter screen, thus ensuring that the cleaning process is both effective and safe.

[0053] In a further preferred embodiment of this utility model, such as Figure 3 As shown, the filter holes of the main filter 5 and the backup filter 6 have a gradient structure, with the diameter of the filter holes near the inlet side of the installation chamber being larger than that of the outlet side.

[0054] In this embodiment, and in a further preferred embodiment of the present invention, such as Figure 1-2 As shown, it also includes a pressure sensor 18 and a controller 19; the pressure sensor 18 is located on the upstream side of the mounting chamber near the main filter screen 5, and the controller 19 is located on the outside of the mold head body 1. The controller 19 is electrically connected to the pressure sensor 18 and the electric push rod 7.

[0055] In this embodiment, when processing materials with high impurity content, the large-diameter filter holes on the inlet side of the main filter screen 5 quickly intercept a large number of large particles of impurities. However, the accumulation of impurities will cause the pressure to rise faster. The pressure sensor 18 (Siemens SITRANS P DSIII) promptly transmits the signal to the controller 19. The controller 19 flexibly adjusts the movement frequency and force of the electric push rod 7 to enhance the cleaning of the main filter screen 5. If the pressure of the main filter screen 5 continues to rise and cannot return to normal after multiple cleanings, it indicates that the main filter screen 5 may be severely clogged or damaged. The controller 19 (NJ501-1100) issues an alarm signal to remind the operator to replace the filter screen.

[0056] Working principle: During normal production, the main filter screen 5 is in the working position, filtering the material flowing through the die head body 1. Its filter screen adopts a gradient pore structure. When the material that has undergone preliminary filtration passes through these smaller diameter pores, the tiny impurity particles are further intercepted, achieving fine filtration. This gradient pore structure allows the filtration accuracy to gradually increase as the material passes through the filter screen, which can more effectively remove impurities of different particle sizes and ensure the purity of the material flowing out of the outlet. Moreover, since the change in pore diameter is gradual, the flow speed of the material in the filter screen is relatively uniform, avoiding the problem of local accumulation or poor flow caused by the sudden reduction in pore size, thus ensuring the uniformity and stability of the output.

[0057] As the usage time increases, more impurities will gradually accumulate on the surface of the main filter screen 5, leading to a decrease in filtration efficiency. At this time, if it is necessary to clean the main filter screen 5, the electric push rod 7 located on the top of the mold head body 1 can be activated. After the electric push rod 7 is activated, its movable rod will extend outward or retract inward, thereby driving the receiving plate 8 fixedly connected to it to move. During the movement of the movable rod, the sealing sleeve 17, with its good elasticity and flexibility, can deform with the extension and retraction of the movable rod, always tightly wrapping the movable rod and maintaining a good fit with the movable rod and the side wall of the mold head body 1. In this way, no matter whether the movable rod extends or retracts, the sealing sleeve 17 can effectively seal the gap between the movable rod and the side wall, preventing the leakage of internal materials or the entry of external impurities due to the movement of the movable rod when cleaning the filter screen, ensuring that the cleaning process is carried out in a stable environment without affecting the cleaning effect and the normal operation of the mold head.

[0058] Fixing blocks 9 extend from both sides of the receiving plate 8. Since the heating nozzle 10 is fixed on the contact surface of the fixing block 9, and the heating nozzle 10 always maintains contact with the surface of the main filter screen 5 and the spare filter screen 6, the heating nozzle 10 will blow along the surface of the filter screen during the movement of the receiving plate 8.

[0059] The movable gap between the filter screen and the mounting carrier 2 allows the filter screen to produce slight shaking or displacement under the action of the heated blow head 10. This slight movement helps the heated blow head 10 to remove impurities from the surface of the filter screen more thoroughly, improving the cleaning effect. At the same time, it avoids the heated blow head 10 from applying excessive pressure to the filter screen and damaging it, ensuring that the cleaning process is both effective and safe, thereby effectively removing impurities from the filter screen and achieving a self-cleaning function.

[0060] If it is determined that the main filter 5 cannot restore its filtration effect through cleaning and needs to be replaced, the main filter 5 can be slid upward along the corresponding limiting guide groove 3 on the side wall of the mounting carrier 2 and moved out of the mounting chamber. The operator can use the handle 14 at the extended end of the main filter 5 to pull it upward, so that the limiting protrusion 12 slides upward along the rectangular limiting groove 11 at the bottom of the mounting carrier 2 and moves it out of the mounting chamber smoothly. At the same time, the spare filter 6, which was originally in the standby position, is slid into the mounting carrier 2 along another set of limiting guide grooves 3. The cooperation between the limiting protrusion 12 and the limiting groove 11 ensures the accuracy of the spare filter 6 in the process of movement and positioning, and quickly completes the switching between the main filter 5 and the spare filter 6, thereby ensuring the continuity and stability of production.

[0061] When cleaning impurities, the operator can slowly loosen the sealing cap 16 at the bottom of the die head body 1, so that the impurities accumulated near the through hole 15 can be discharged from the outside of the installation chamber through the through hole 15 under the action of gravity. After cleaning, tighten the sealing cap 16 again to ensure the sealing of the die head body 1.

[0062] It should be noted that, for the sake of simplicity, the foregoing embodiments are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to the present invention. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0063] It should be understood that the disclosed apparatus can be implemented in other ways, given the several embodiments provided in this application. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of units described above may be implemented in other ways in practice. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or communication connections shown or discussed may be through some interfaces; indirect coupling or communication connections between devices or units may be telecommunications or other forms.

[0064] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0065] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Although this utility model has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of this utility model according to the circumstances without conflict or creative effort, thereby obtaining different technical solutions that do not fundamentally depart from the concept of this utility model. These technical solutions are also within the scope of protection of this utility model.

Claims

1. A quick-change, self-cleaning device for the die head, characterized in that, include: The mold head body has a through mounting chamber inside for installing the filter unit; The filter unit includes: The mounting carrier is coaxially arranged with the mold head body and fixed in the mounting cavity; the side wall of the mounting carrier has two sets of parallel and spaced limiting guide grooves along the axial direction, each set of limiting guide grooves is limited by two opposite groove walls, and the inner surface of the groove wall is provided with guide rails. The main filter and the backup filter are slidably fitted into two sets of limiting guide grooves; both the main filter and the backup filter are plate-shaped structures, and their two sides are in sliding contact with the guide rails of the corresponding limiting guide grooves. An electric push rod is located on the top of the die head body. Its fixed end is fixedly connected to the die head body through a mounting base, and the free end of the movable rod passes through the side wall of the die head body and is fixedly connected to the receiving plate. The receiving plate is located between the mounting carrier and the electric push rod, with fixing blocks extending from both sides of it; The heated nozzle is fixed to the contact surface of the fixed block, and the heated nozzle is positioned opposite to the surfaces of the main filter and the spare filter.

2. The self-cleaning device for quick screen replacement of the die head as described in claim 1, characterized in that, Two sets of rectangular limiting grooves are provided at the bottom of the mounting carrier, and limiting protrusions are provided on one side of the corresponding limiting grooves at the bottom of the main filter and the spare filter.

3. The self-cleaning device for quick screen replacement of the die head as described in claim 2, characterized in that, A set of mounting slots is opened through the top of the mold head body, and the main filter and spare filter extend to the outside of the mounting slots, with a handle at the extended end.

4. The self-cleaning device for quick screen changing of the die head as described in claim 3, characterized in that, A through hole is provided on the bottom of the outer groove of the die head body near the main filter screen, and the through hole is connected to the bottom of the die head body; a sealing cap is threaded on the bottom of the die head body.

5. The self-cleaning device for quick screen changing of the die head as described in claim 1, characterized in that, A sealing sleeve is provided between the movable rod of the electric push rod and the side wall of the mold head body. The sealing sleeve is made of a certain material.

6. The self-cleaning device for quick screen changing of the die head as described in claim 3, characterized in that, The fixing block and the receiving plate are fixed by vulcanization bonding, and the thickness of the fixing block is greater than that of the main filter screen and the spare filter screen. There is an movable gap between the main filter screen, the spare filter screen and the installation carrier.

7. The self-cleaning device for quick screen changing of the die head as described in claim 6, characterized in that, The filter holes of the main filter and the backup filter have a gradient structure, with the diameter of the filter holes near the inlet of the installation chamber being larger than that of the outlet side.

8. The self-cleaning device for quick screen changing of the die head as described in claim 7, characterized in that, It also includes a pressure sensor and a controller; the pressure sensor is located on the upstream side of the installation chamber near the main filter screen, and the controller is located on the outside of the mold head body. The controller is electrically connected to the pressure sensor and the electric push rod.

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