Belt type circulating screen exchanger

Abstract

The utility model discloses a belt type circulating screen exchanger, belongs to the field of melt purification screen exchangers in plastic extrusion production, and can be recycled for multiple times of filtration to improve the filtering effect on a melt. The screen exchanger comprises a screen exchanger body, a filter screen and a driving device, and the screen exchanger body is provided with a melt channel allowing melt to pass through and two containing grooves perpendicular to the melt channel and penetrating through the screen exchanger body; the filter screen comprises a first filter part and a second filter part, the first filter part and the second filter part are arranged in the corresponding containing grooves and can filter melt passing through the melt channel, and the driving mechanisms are located on the two sides of the exterior of the screen exchanger body and used for supporting the filter screen and driving the filter screen to move in the screen exchanger body; according to the melt filtering device, the driving mechanism drives the filter screen to move in the containing groove, melt is filtered circularly, the melt can be filtered twice, the filter screen can be fully utilized, the filtering effect on the melt is improved, and then the quality of produced products can be guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of melt purification screen changers in plastic extrusion production, and particularly relates to a belt-type circulating screen changer. Background Art

[0002] A screen changer is used to filter out foreign particles and impurities when the plasticized material flows through the filter screen. These impurities may include aged or deteriorated particulate matter generated during the production process, particulate matter of low precision grade in recycled materials, various non-plastic substances in recycled materials, and plastics with incompatible properties, etc. Through filtration, the screen changer can ensure the purity of the raw materials of the production line, reduce the generation of defective products and waste products. Insufficient filtration will lead to die head blockage and problems with the quality of the produced products. Due to the continuous increase in the pressure at the feed end of the screen changer, some impurities may pass through the filter screen, making it difficult to ensure the purity of the melt.

[0003] The belt-type circulating screen filter with the publication number CN103878969B uses a closed-loop filter screen to filter the plastic melt, but it can only filter the melt once, making it difficult to ensure the filtering effect, and only one side of the filter screen is used, so the filter screen cannot be fully utilized.

[0004] For example, the anti-flushing mesh belt screen changer disclosed in the publication number CN107738431A uses a first filter mesh belt and a second filter mesh belt to filter the melt. Although two filter mesh belts are used, it can only filter the melt once, making it difficult to ensure the filtering effect. Due to the use of two filter mesh belts, its volume is also relatively large. Utility Model Content

[0005] The present application provides a belt-type circulating screen changer to solve the problems of insufficient utilization of the filter screen and poor filtering effect in the above-mentioned prior art, and adopts the following technical solutions:

[0006] The belt-type circulating screen changer includes a screen changer body, and a melt passage for the melt to pass through is provided on the screen changer body, and two receiving grooves vertically penetrating the screen changer body and perpendicular to the melt passage;

[0007] A filter screen, the filter screen is connected end to end to form a closed loop, the filter screen includes a first filtering part and a second filtering part, and both the first filtering part and the second filtering part are arranged in the corresponding receiving grooves and can respectively filter the melt passing through the melt passage. The filter screen can be fully utilized, and the melt can be filtered twice, further improving the filtering effect on the melt.

[0008] Preferably, it further includes a driving mechanism, the driving mechanism is located on both sides outside the screen changer body, and is used to support the filter screen and drive the filter screen to move in the screen changer body.

[0009] Further preferably, the driving mechanism includes a driving roller and a driven roller, and a power device drivingly connected to the driving roller, and the filter screen is sleeved outside the driving roller and the driven roller. The driving mechanism can drive the filter screen to move in the receiving groove or rotate around the driving mechanism, so as to realize the recycling of the filter screen.

[0010] Preferably, the 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, and they are detachably connected to each other. It is convenient for disassembly, maintenance and transportation.

[0011] Further preferably, the intermediate cover plate and the second cover plate are respectively provided with perforated plates corresponding to the melt channels. It can play a supporting role for the filter screen and avoid the filter screen from being deformed by force.

[0012] Preferably, a sealing structure is further included, and the sealing structure is respectively arranged on both sides of the changer. To prevent the leakage of the melt.

[0013] Further preferably, the sealing structure includes a heating device and a cooling device, and the heating device and the cooling device are arranged alternately. Reduce the overall volume and the occupied space.

[0014] Further preferably, an isolation groove is further provided on the changer body. It can avoid affecting the melt in the melt channel.

[0015] The beneficial effects of the present application compared with the prior art are as follows:

[0016] (1) The filter screen with the head and tail connected is adopted, and both the first filtering part and the second filtering part of the filter screen are arranged on the changer body. The filter screen is driven to move in the receiving groove by the driving mechanism, and the melt is filtered cyclically, so that the melt can be filtered twice to improve the filtering effect on the melt, and further ensure the quality of the produced products.

[0017] (2) The changer body is divided into a first cover plate, an intermediate cover plate and a second cover plate, and they are detachably connected to each other, which is convenient for disassembly, transportation and replacement of the filter screen. Brief Description of the Drawings

[0018] Figure 1 is a three-dimensional schematic diagram of the present application;

[0019] Figure 2 is a front view of the present application;

[0020] Figure 3 is a sectional view taken along line D-D of the present application.

[0021] In the figure:

[0022] 1. changer body, 11. first cover plate, 12. intermediate cover plate, 13. second cover plate;

[0023] 2. Filter screen, 21. First filtering part, 22. Second filtering part;

[0024] 3. Driving mechanism, 31. Driving roller, 32. Tensioning roller, 33. Driven roller;

[0025] 4. Perforated plate;

[0026] 5. Sealing structure, 51. Heating device, 52. Cooling device;

[0027] 6. Receiving groove;

[0028] 100. Feed end, 200. Discharge end. Specific embodiments

[0029] 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.

[0030] Refer to Figures 1 to 3 , and further illustrate the present application:

[0031] Combined with Figure 1 , a belt-type circulating screen changer, including a screen changer body 1, the screen changer body 1 is a split and detachable structure, the screen changer body 1 includes 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 is convenient for transportation, disassembly and maintenance. Of course, the screen changer body 1 can also be an integral structure. The screen changer body 1 is provided with a melt passage for the melt to pass through, and two receiving grooves 6 vertically penetrating the screen changer body 1 and perpendicular to the melt passage. In this embodiment, the receiving grooves 6 are respectively arranged on the first cover plate 11 and the second cover plate 13; the melt passage includes a feed end 100 on the first cover plate 11, and the feed end 100 is used to connect to a feeding device; a discharge end 200 on the second cover plate 13, and the discharge end 200 is used to connect to a forming device; a transition section (not shown) on the intermediate cover plate 12, and the transition section is used to connect the feed end 100 and the discharge end 200.

[0032] The filter screen 2, the filter screen 2 includes a first filtering part 21 and a second filtering part 22, and the first filtering part 21 and the second filtering part 22 are both arranged in the corresponding receiving grooves 6, and can respectively filter the melt passing through the melt passage. Combined with Figure 3, the filter screen 2 is a filter net connected end to end. During operation, the melt flows from the feed end 100 to the discharge end 200. In this process, the melt will successively pass through the first filtering part 21 and the second filtering part 22, which can filter the melt multiple times, improve the filtering effect of the melt, and ensure the product quality and yield of the produced products.

[0033] In order to enable the filter screen to be recycled; a driving mechanism 3 is further included. The driving mechanism 3 is located on both outer sides of the changer body 1, and is used to support the filter screen 2 and drive the filter screen 2 to move within the changer body 1. The driving mechanism can drive the filter screen to be recycled, which can greatly shorten the time for replacing the filter screen and improve production efficiency.

[0034] Among them, the driving mechanism 3 includes a driving roller 31 and a driven roller 33, and a power device drivingly connected to the driving roller 31. The filter screen 2 is sleeved outside 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 filter screen 2 to move along the receiving groove 6. At least one tension roller 32 is provided on one side of the driving roller 31. The tension roller 32 abuts against the outer side of the filter screen 2 to tension the filter screen 2, so that the filter screen 2 can closely fit on the surface of the driving roller 31 to facilitate driving the filter screen 2 to move.

[0035] In some embodiments, porous plates 4 corresponding to the melt channels are respectively provided on the intermediate cover plate 12 and the second cover plate 13. The porous plates 4 can support the filter screen 2, prevent the filter screen 2 from deforming, and at the same time can further improve the filtering effect.

[0036] Combined Figure 1 and Figure 3 , in order to prevent the melt from flowing out of the changer body 1 along the receiving groove 6; a sealing structure 5 is further included on the changer body 1. The sealing structure 5 is respectively located on the left and right sides of the changer, and forms a sealing area on both sides of the changer body 1. The sealing structure 5 is used to seal the receiving groove 6 in the sealing areas on both sides of the changer body 1 to prevent the melt from flowing to the outside of the changer body 1 along the receiving groove 6.

[0037] Combined Figure 3, the sealing structure 5 includes a heating device 51 and a cooling device 52, which are arranged alternately between the heating device 51 and the cooling device 52. The cooling device 52 is used to cool the melt entering the sealing structure 5, so that the melt solidifies from a liquid state to a 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 converted into a liquid state, so that the driving mechanism 3 can drive the filter screen 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 heat or cool down the sealing structure; the cooling device and the heating device are arranged together, so that the overall volume can be reduced.

[0038] It should be noted that the heating device 51 and the cooling device 52 work independently. When the filter screen needs to be replaced, the heating device 51 heats and melts the solid melt blocking the receiving groove 6, and pulls out the filter screen with impurities attached to the melt passage to the outside of the screen changer body, and replaces it with a new filter screen. After the screen change is completed, the cooling device 52 cools the sealing area, and then solidifies the melt to block the receiving groove 6.

[0039] In some embodiments, an isolation groove is further provided on the screen changer body, and 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.

Claims

1. A belt-type circulating screen changer, comprising a screen changer body, characterized in that: The screen changer body is provided with a melt channel for the melt to pass through, and two receiving grooves perpendicular to the melt channel and penetrating the screen changer body; The filter screen is connected end to end to form a closed loop, and includes a first filter part and a second filter part. 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 respectively.

2. The belt-type circulating screen changer according to claim 1, characterized in that: It also includes a driving mechanism, which is located on both sides of the outside of the screen changer body and is used to support the filter screen and drive the filter screen to move within the screen changer body.

3. The belt-type circulating screen changer according to claim 2 is characterized in that: The driving mechanism comprises a driving roller and a driven roller, and a power device connected to the driving roller through transmission, and the filter screen is sleeved outside the driving roller and the driven roller.

4. The belt-type circulating 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.

5. The belt-type circulating screen changer according to claim 4 is characterized in that: The middle cover plate and the second cover plate are respectively provided with porous plates corresponding to the molten material channels.

6. The belt-type circulating 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.

7. The belt-type circulating screen changer according to claim 6, 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.

8. The belt-type circulating screen changer according to any one of claims 1 to 7, characterized in that: The screen changer body is also provided with an isolation groove.

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