Circulating filtration screen exchanger

Abstract

The utility model discloses a circulating filtration screen exchanger which comprises a screen exchanger body, a mesh belt, a driving mechanism, an impurity removal mechanism and a melt channel arranged on the screen exchanger body, the mesh belt is connected end to end to form a closed loop, and two containing grooves perpendicular to the melt channel are formed in the screen exchanger body; the mesh belt comprises a first filtering part and a second filtering part, and the first filtering part and the second filtering part are arranged in the corresponding containing grooves and can filter the melt; the driving mechanism is used for supporting the mesh belt and driving the mesh belt to move in the accommodating groove; the impurity removal mechanisms are respectively arranged on one side of the belt outlet end of the first filtering part and one side of the belt outlet end of the second filtering part; the first filtering part and the second filtering part can filter the melt, the filtering effect is improved, meanwhile, impurities on the mesh belt are cleaned through the impurity removing mechanism, follow-up recycling of the mesh belt is guaranteed, the service life is prolonged, and the production efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of plastic melt filtration and purification, and particularly relates to a circulating filtration screen changer. Background Art

[0002] A screen changer can be installed on an extruder, a melt pump, a reactor or other extrusion production lines to filter impurities in the melt and provide a clean and impurity-free plastic melt for subsequent processes. This not only improves the product quality, but also improves the plasticization and homogenization effects of raw materials, making the product texture more uniform and the surface quality and finish better. It is difficult to clean the impurities in the mesh holes of the existing screen changer, and the mesh belt needs to be frequently replaced.

[0003] For an active mesh belt screen changer with the existing publication number CN107584746A, the coiled mesh belt is arranged in a mesh box, and one end of the mesh belt is dragged to move by a hydraulic driving device. When a roll of mesh belt is used up, the mesh belt needs to be replaced again. The steps of replacing the new mesh belt are cumbersome, time-consuming and laborious, and the mesh belt cannot be recycled, and the melt can only be filtered once, and its filtering effect is not good.

[0004] For the belt-type circulating filter screen filter with the publication number CN103878969B, it uses a closed-loop filter screen to filter the plastic melt, but it can only filter the melt once, it is difficult to ensure the filtering effect, and only one side of the mesh belt is used, and the mesh belt cannot be fully utilized. Utility Model Content

[0005] The present application provides a circulating filtration screen changer to solve the problems that the existing technology cannot circulate and filter the melt and the filtering effect is not good, and adopts the following technical solutions:

[0006] The circulating filtration screen changer includes a screen changer body, a mesh belt, and a melt passage provided on the screen changer body. The mesh belt is connected end to end to form a closed loop, and two receiving grooves perpendicular to the melt passage are provided on the screen changer body;

[0007] The mesh belt includes a first filtering part and a second filtering part. The first filtering part and the second filtering part are both arranged in the corresponding receiving grooves and can respectively filter the melt passing through the melt passage multiple times;

[0008] A driving mechanism, which is used to support the mesh belt and drive the mesh belt to move in the receiving groove;

[0009] An impurity removing mechanism, which is respectively arranged on one side of the outlet ends of the first filtering part and the second filtering part to respectively remove the impurities remaining on the mesh belt.

[0010] Preferably, the impurity removing mechanism includes a housing, a gas supply device and a heating component. A through groove for the mesh belt to pass through is provided in the housing. At least one air blowing groove is provided on the side wall of the through groove. The gas supply device is communicated with the air blowing groove for supplying gas to the air blowing groove. The heating component is used for heating the gas supplied to the air blowing groove.

[0011] More preferably, at least one scraper is further provided on the housing. The scraper is inclined and abuts against the mesh belt on the side opposite to the air blowing groove.

[0012] Preferably, the impurity removing mechanism is arranged on the side where the mesh belt moves out of the receiving groove.

[0013] Preferably, the screen changer body is of a split structure and sequentially includes a first cover plate, an intermediate cover plate and a second cover plate from front to back, which are detachably connected to each other.

[0014] More preferably, porous plates corresponding to the melt channels are respectively provided on the intermediate cover plate and the second cover plate.

[0015] Preferably, a sealing structure is further included, and the sealing structure is respectively arranged on both sides of the screen changer body.

[0016] More preferably, the sealing structure includes a heating device and a cooling device, and the heating device and the cooling device are arranged alternately.

[0017] More preferably, a detection component is further included, and the detection component is arranged on the screen changer body for detecting the pressure in the melt channel.

[0018] Preferably, a controller is further included, and the controller is electrically connected to the driving mechanism, the detection component and the sealing structure.

[0019] The beneficial effects of this application relative to the prior art are as follows:

[0020] (1) By driving the closed-loop mesh belt connected end to end through the driving mechanism, the first filtering part and the second filtering part of the mesh belt can realize two-stage filtering of the melt, which can improve the filtering effect of the melt. Moreover, with impurity removing mechanisms respectively arranged on both sides outside the screen changer, impurities remaining on the mesh belt can be removed, so that the mesh belt can be recycled. Without damage to the mesh belt, there is no need to replace it, which improves the service life of the mesh belt, production efficiency and quality.

[0021] (2) The impurity removing mechanism can easily and cleanly blow out the impurities in the pores of the mesh belt by spraying gas with a certain temperature from the side opposite to the side with impurities, and can comprehensively remove the impurities on the mesh belt, providing guarantee for subsequent recycling.

[0022] (3) The controller can control the sealing structure, the driving mechanism and the impurity removal mechanism to work according to the feedback of the detection component, realize automatic screen changing without manual intervention, and can reduce the working intensity of the operator. Description of the Drawings

[0023] Figure 1 is a three-dimensional schematic diagram of the present application;

[0024] Figure 2 is a three-dimensional schematic diagram of the screen changer body of the present application;

[0025] Figure 3 is a half-sectional schematic diagram of the present application;

[0026] Figure 4 is a partial enlarged view at A of the present application.

[0027] In the figure:

[0028] 1. Screen changer body, 11. First cover plate, 12. Intermediate cover plate, 13. Second cover plate;

[0029] 2. Mesh belt, 21. First filtering part, 22. Second filtering part;

[0030] 3. Driving mechanism, 31. Driving roller, 32. Tensioning roller, 33. Driven roller;

[0031] 4. Perforated plate;

[0032] 5. Sealing structure, 51. Heating device, 52. Cooling device;

[0033] 6. Accommodating groove;

[0034] 7. Impurity removal mechanism, 70. Housing, 71. Blowing groove, 72. Scraper, 73. Through groove;

[0035] 100. Feed end, 200. Discharge end. Specific Embodiments

[0036] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings of the present application. Obviously, the described embodiments of the present application are only partial embodiments of the present application, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0037] In combination with Figures 1 to 4 , the present application is further described:

[0038] In combination with Figure 1 and Figure 2The circulating filtering screen changer comprises a screen changer body and a screen belt, and a melt channel arranged on the screen changer body. The screen changer body 1 is a split and detachable structure. The screen changer body 1 comprises a first cover plate 11, an intermediate cover plate 12 and a second cover plate 13, and are arranged in sequence from front to back, which can be convenient for transportation, disassembly and maintenance. Of course, the screen changer body 1 can also be an integrated structure.

[0039] The screen changer body 1 is provided with a melt channel for the melt to pass through, and two receiving grooves 6 that penetrate the screen changer body 1 perpendicularly to the melt channel. In this embodiment, the receiving grooves 6 are respectively arranged on the first cover plate 11 and the second cover plate 13; the melt channel includes a feed end 100 on the first cover plate 11, and the feed end 100 is used to connect to the feeding device; a discharge end 200 on the second cover plate 13, and the discharge end 200 is used to connect to the molding device; a transition section (not shown) on the middle cover plate 12, and the transition section is used to connect the feed end 100 and the discharge end 200.

[0040] Combination Figure 1 and Figure 3 The mesh belt 2 includes a first filter portion 21 and a second filter portion 22, both of which are arranged in the corresponding receiving groove 6, and can filter the melt passing through the melt channel respectively.

[0041] Combination Figure 3 The first filter part and the second filter part are connected end to end to form a closed loop, and the inner and outer sides of the mesh belt form the inner and outer peripheral surfaces for melt filtering; when working, the melt flows to the discharge end 200 through the feed end 100. During this process, the melt will pass through the first filter part 21 and the second filter part 22 in sequence, and the melt can be filtered multiple times, thereby improving the effect of melt filtering to ensure the quality of the output products and the yield of the products.

[0042] A driving mechanism, wherein the driving mechanism is used to support the mesh belt and drive the mesh belt to move in the containing groove 6.

[0043] Wherein, the driving mechanism 3 includes a driving roller 31 and a driven roller 33, and a power device (not shown) that is connected to the driving roller 31; the mesh belt 2 is sleeved on the outside of the driving roller 31 and the driven roller 33; the power device can be a motor; the driving roller 31 is driven by the power device to drive the mesh belt 2 to move along the accommodating groove 6, and at least one tensioning roller 32 is provided on one side of the driving roller 31, and the tensioning roller 32 abuts against the outer side of the mesh belt 2 to tension the mesh belt 2 so that the mesh belt 2 can fit tightly against the surface of the driving roller 31, so as to drive the mesh belt 2 to move.

[0044] Combined with Figure 1 and Figure 3 , in order to facilitate the removal of impurities on the surface and in the mesh holes of the mesh belt 2; a cleaning mechanism 7 is further included. The cleaning mechanism 7 is arranged along the moving direction of the mesh belt 2 in the receiving groove 6, and is respectively arranged on both sides of the mesh belt changer body, and is used to respectively remove the impurities remaining on the mesh belt 2. Among them, the cleaning mechanism 7 is respectively arranged on the side of the outlet end of the first filtering part 21 and the second filtering part 22, that is, the side where the mesh belt moves out of the mesh belt changer body; it is ensured that the impurities can be removed from the mesh belt in time to avoid being difficult to remove after cooling.

[0045] Combined with Figure 4 , taking the removal of impurities on the outer peripheral surface of the mesh belt as an example, the cleaning mechanism 7 includes a housing 70, a gas supply device and a heating component. A through groove 73 for accommodating the mesh belt is arranged in the housing 70. A blowing groove 71 is arranged on the side wall of the through groove 73. The gas supply device is communicated with the blowing groove 71 and is used to supply gas to the blowing groove 71. The heating component is used to heat the gas supplied to the blowing groove. The heating component can be a heating wire or a heating rod, etc.; the blowing groove 71 is longitudinally arranged on the housing 70; the blowing groove 71 is located on the side of the inner peripheral surface of the mesh belt; since the melt has a certain viscosity, by spraying gas with a certain temperature, the impurities in the mesh holes can be blown out more easily.

[0046] Combined with Figure 4 , at least one scraper 72 is further arranged on the housing 70. The scraper 72 is obliquely arranged on the side opposite to the blowing groove 71 and abuts against the mesh belt 2. The number of the scrapers 72 is the same as that of the blowing grooves 71. In this embodiment, both the scraper 72 and the blowing groove 71 are two; the impurities in the mesh holes are blown out to the side where the scraper 72 is arranged so that the scraper 72 can scrape them. Multiple scrapers 72 can more comprehensively remove the impurities on the mesh belt, providing a guarantee for subsequent recycling.

[0047] In some embodiments, porous plates 4 corresponding to the melt channels are respectively arranged on the intermediate cover plate 12 and the second cover plate 13. The porous plates 4 can support the mesh belt 2 to prevent the mesh belt from deforming.

[0048] Combined with Figure 1 and Figure 3 , in order to prevent the melt from flowing out of the mesh belt changer body 1 along the receiving groove 6; a sealing structure 5 is further included on the mesh belt changer body 1. The sealing structure 5 is respectively located on the left and right sides of the mesh belt changer, and forms a sealing area on both sides of the mesh belt changer body 1. The sealing structure 5 is used to seal the receiving groove 6 in the sealing area on both sides of the mesh belt changer body 1 to prevent the melt from flowing to the outside of the mesh belt changer body 1 along the receiving groove 6.

[0049] Combined with Figure 3 , the sealing structure 5 includes a heating device 51 and a cooling device 52. The heating device 51 and the cooling device 52 can be arranged alternately. The cooling device 52 is used to cool down the melt entering the sealing structure 5, so that the melt solidifies from liquid state to solid state, blocking the receiving groove 6 at the sealing structure 5 to prevent the melt from flowing out; the heating device 51 is used to melt the solid melt blocking the receiving groove 6, so that the solid melt is transformed into liquid state, so that the driving mechanism 3 can drive the mesh belt 2 to move in the receiving groove 6; wherein, the heating device can be a heating rod, and the cooling device can be cooled by circulating cooling water, as long as it can realize heating or cooling down of the sealing structure. Setting the heating device and the cooling device together can reduce the overall volume.

[0050] In some embodiments, an isolation groove is further provided on the screen changer body, such as Figure 3 , the isolation groove can separate the sealing area from the screen changer body, thereby reducing the influence of the temperature change in the sealing area on the melt flowing in the melt passage.

[0051] It further includes a controller (not shown) and a detection component (not shown). The detection component is arranged on the screen changer body and is used to detect the pressure in the melt passage. Among them, the detection component can be a pressure sensor; the controller is electrically connected to the detection component, the sealing structure, the impurity removal mechanism 7 and the driving mechanism. The controller can control the driving mechanism and the sealing structure to work according to the feedback signal of the detection component, so as to realize automatic screen changing without manual screen changing, and can reduce the working intensity of the operator.

[0052] During normal operation, the mesh belt normally filters the melt, and the controller controls the sealing structure to cool down the melt flowing into the sealing area to block the sealing area, so as to ensure that the mesh belt can normally filter the melt.

[0053] When the impurities on the mesh belt at the melt passage increase and the pressure increases, the detection component feeds back the signal to the controller. The controller controls the sealing structure to heat the sealing area, so that the melt blocking the sealing area flows. The driving mechanism drives the mesh belt to move, conveying the mesh belt with the remaining impurities outwards, and the clean part of the mesh belt moves to the melt passage to continue filtering; and so on in a cycle. During this process, the equipment does not need to stop.

[0054] When the mesh belt with the impurity part moves into the impurity removal mechanism 7, the impurity removal mechanism 7 blows out the impurities in the mesh holes of the mesh belt by spraying high-temperature gas on the mesh belt, so that the scraper 72 can completely remove the impurities on the mesh belt for subsequent recycling of the mesh belt.

Claims

1. A circulating filter screen changer, comprising a screen changer body and a screen belt, and a melt channel provided on the screen changer body, wherein the screen belt is connected end to end to form a closed loop, and is characterized in that: The screen changer body is provided with two receiving grooves perpendicular to the melt channel; The mesh belt comprises a first filter part and a second filter part, wherein the first filter part and the second filter part are both arranged in the corresponding receiving groove, and can filter the melt passing through the melt channel for multiple times respectively; A driving mechanism, the driving mechanism is used to support the mesh belt and drive the mesh belt to move in the containing groove; The impurity removal mechanism is respectively arranged on one side of the belt outlet end of the first filter part and the second filter part, and is used to remove impurities remaining on the mesh belt respectively.

2. The circulating filter screen changer according to claim 1, characterized in that: The impurity removal mechanism includes a shell, an air supply device and a heating component. The shell is provided with a through slot for the mesh belt to pass through. The side wall of the through slot is provided with at least one blowing slot. The air supply device is connected to the blowing slot to supply air to the blowing slot. The heating component is used to heat the gas supplied to the blowing slot.

3. The circulating filter screen changer according to claim 2, characterized in that: At least one scraper is also provided on the shell, and the scraper is tilted and arranged at a side opposite to the blowing groove to abut against the mesh belt.

4. The circulating filter screen changer according to claim 1, characterized in that: The impurity removing mechanism is arranged on the side where the mesh belt moves out of the containing groove.

5. The circulating filter screen changer according to claim 1, characterized in that: The screen changer body is a split structure, and comprises a first cover plate, a middle cover plate and a second cover plate from front to back, which are detachably connected to each other.

6. The circulating filter screen changer according to claim 5, characterized in that: The middle cover plate and the second cover plate are respectively provided with porous plates corresponding to the molten material channels.

7. The circulating filter screen changer according to claim 1, characterized in that: It also includes a sealing structure, which is respectively arranged on both sides of the screen changer body.

8. The circulating filter screen changer according to claim 7, characterized in that: The sealing structure comprises a heating device and a cooling device, and the heating device and the cooling device are arranged alternately.

9. The circulating filter screen changer according to claim 8, characterized in that: It also includes a detection component, which is arranged on the screen changer body and is used to detect the pressure in the melt channel.

10. The circulating filter screen changer according to claim 9, characterized in that: It also includes a controller, which is electrically connected to the driving mechanism, the detection component and the sealing structure.

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