A filter chamber with a flow guide structure

Abstract

The present invention discloses a filter chamber with a flow guide structure, which belongs to the field of material melt filtration. The present invention greatly improves the flow speed and flow smoothness of the filtered material in the outlet slot area just above the eye-shaped sealing island by adding a new expansion flow channel and cooperating with a depth-gradient outlet slot, thereby improving the effective filtration area, filtration efficiency and filtration volume of the filter chamber, reducing the residual material when changing the screen, and making the exhaust speed of the new filter faster, thereby solving the technical problems that the material is easily blocked in this area and the material melt pressure fluctuates greatly when the filter screen is moved out for changing or returning for exhaust; at the same time, it can greatly alleviate the impact of the filtered material on the eye-shaped sealing island, ensure the sealing effect, and extend the service life of the device; since the filtered material does not need to rely on the expansion of the height of the outlet slot to achieve smooth flow, it is not necessary to increase the thickness of the porous plate and the reciprocating plate, thereby reducing consumables and reducing costs, and the height of the outlet slot can be appropriately reduced to compensate for the increase in the thickness of the porous plate, thereby improving the rigidity, strength and pressure resistance of the porous plate.

Description

Technical Field

[0001] The invention relates to the technical field of material melt filtration during the pelletizing process or production and recycling of high molecular polymers, and more specifically to a filter chamber with a flow guide structure, which is particularly suitable for a dual-channel online screen changing device. Background Art

[0002] In 2019, the applicant filed a patent application with the patent number 201921483151.1 and the name "A non-stop screen changing device for polystyrene carbon dioxide extrusion foaming" and obtained authorization. Since the non-stop screen changing device is provided with two slide plate filter units, which are respectively inserted into the two through-hole slide grooves in the main body of the screen changing device, the filter screen is in the filter channel after being inserted in place. When the filtering is working normally, the two filter channels and the two slide plate filter units work at the same time. When the filter needs to be replaced, the other slide plate filter unit and the filter channel continue to work, and the slide plate filter unit to be replaced is pushed forward to the screen changing position under the action of the oil cylinder, and the corresponding filter channel is closed at the same time. After the dirty filter screen is removed and replaced with a clean filter screen, it is pulled back to the working position. Repeating the operation can change the filter screen in another slide plate filter unit. Therefore, the non-stop screen changing device can conveniently and quickly realize non-stop screen changing and ensure normal and continuous production. At the same time, since the dynamic sealing ring and the static sealing ring in the non-stop net changing device are tightly fitted on the upper and lower ends of the filter unit base plate to form a mechanical flexible seal, and then with the extrusion effect of the adjustment spring, there is no natural gap between the sealing surfaces after assembly, and they are completely fitted together. The pressure of the plastic melt itself is used to seal the filter unit, and there is no matching gap, no air leakage, no material leakage, and zero leakage sealing is achieved in the working state; even in the process of changing the net, the filter unit can slide back and forth freely, and can automatically compensate after wear to achieve zero leakage sealing in the process of changing the net; therefore, the non-stop net changing device can also achieve zero leakage sealing and lasting sealing in the working state or during the process of changing the net. In addition, the slide plate filter unit in the non-stop net changing device is an integral structure. When changing the net, it is only necessary to push the slide plate filter unit to the net changing position to replace the clean new filter net, and then pull it back to the working position. There is no need to manually disassemble the net block, and there is no need for personnel to contact the high-temperature filter unit. The operation is simple, the use is safe, and the labor intensity is greatly reduced. In summary, since the non-stop screen changing device solves the technical problem of non-stop screen changing and ensuring normal continuous production, solves the sealing problem of zero leakage in the working state or during the screen changing process, and also has the advantages of simple operation, safe use, and low labor intensity, the non-stop screen changing device is widely used in the plastic processing industry and is suitable for the production of any plastic products except heat-sensitive or thermosetting plastics, especially for the production of XPS (polystyrene carbon dioxide extruded foam board), KT board and other extruded plastic products.

[0003] Although the above-mentioned non-stop screen changing device has been widely promoted and applied, the applicant has found the following areas that need to be optimized and improved when tracking and summarizing the after-sales feedback from customers, as shown below:

[0004] 1. Since an eye-shaped sealing island is designed on the outlet plate substrate, that is, an eye-shaped protruding sealing island is horizontally extended toward the center of the post-filter cavity of the filter chamber, the space between the filter unit substrate plate in the slide-type filter unit and the post-filter cavity outlet slot of the filter chamber is relatively narrow. During normal filtering production, the flow of filtered materials with an area equal to the eye-shaped sealing island is blocked, which can easily cause material blockage and reduce the filtering capacity of the entire screen changing device.

[0005] 2. The filtered materials here will also impact the sealing island, reducing the sealing effect and service life of the sealing island and the entire sealing system, especially for corrosive materials.

[0006] 3. Although the outlet slot space height of the filter chamber in Patent 201921483151.1 is designed to be larger than that of a conventional screen changing device, it still does not reach the same height as the inlet slot. If the outlet slot space continues to increase, the overall thickness of the carrier reciprocating plate of the filter chamber will increase, the manufacturing cost will rise, and other side effects will follow, such as: the larger the space, the more materials can be accommodated, and the greater the waste of each screen change; in addition, the space left after the screen is changed and the materials are cleaned will also increase, and the pressure drop generated when entering the work will also be greater, affecting the stability and continuity of production.

[0007] 4. The outlet slot space height of the filter chamber in Patent 201921483151.1 is designed to be larger than that of the conventional screen changing device, resulting in a large waste of screen changing each time; in addition, the pressure drop generated when the new screen is replaced and then put into work is also large, affecting the stability and continuity of production. Summary of the invention

[0008] The purpose of the present invention is to provide a filter chamber with a flow guide structure to address the deficiencies in the above-mentioned prior art. The present invention greatly improves the flow speed and flow smoothness of the filtered material in the outlet slot area directly above the eye-shaped sealing island from the filter chamber to the post-filter chamber by adding a new expansion channel and cooperating with a depth-gradient outlet slot, thereby improving the effective filtering area, filtering efficiency and filtering volume of the entire filter chamber, reducing the residual material when changing the screen, and the exhaust speed of the new filter screen is faster, solving the technical problems that the material in the traditional filter chamber is easily blocked in this area and the material melt pressure fluctuates greatly when the filter screen is removed or returned for exhaust; at the same time, the smooth flow of the filtered material can greatly alleviate the impact of the filtered material on the eye-shaped sealing island, ensure the sealing effect, and extend the service life of the device; in addition, since the filtered material of the present invention does not need to rely on the height of the expanded outlet slot to achieve smooth flow, it is not necessary to increase the thickness of the porous plate and the reciprocating plate, reduce consumables and reduce costs, and the height of the overall outlet slot can be appropriately reduced to compensate for the increase in the thickness of the porous plate, that is, it can also improve the rigidity, strength and pressure resistance of the porous plate.

[0009] The purpose of the present invention can be achieved by the following technical measures:

[0010] The filter chamber with a flow guide structure of the present invention comprises a filter chamber whose upper end is connected to a pre-filter chamber in an inlet plate of a main body, a post-filter chamber in an outlet plate of a main body, and a filter chamber located at the left and right center of the front end of a reciprocating plate (on the one hand, the filter chamber is used to embed a filter screen and a porous plate; on the other hand, as the reciprocating plate moves to a filtering working position, the filter chamber is connected with the pre-filter chamber and the post-filter chamber to form a filtering flow channel for materials), and a filter screen and a porous plate embedded in the filter chamber from top to bottom (the filter screen and the porous plate are stacked and embedded in the filter chamber of the reciprocating plate, impurities in the material can be filtered through the filter screen, and the porous plate is used to support the filter screen); the filter chamber is composed of an inlet slot, a filter screen embedding slot, a porous plate mounting hole, and a depth gradient outlet The invention discloses a four-step columnar hole structure composed of an orifice groove (the filter mesh embedding groove is used for embedding the filter mesh; the porous plate mounting hole is used for embedding the porous plate; the inlet groove and the depth-gradient outlet groove serve as material channels before and after filtration on the one hand, and avoid surface contact and friction between the porous plate and the main body inlet plate and the main body outlet plate on the other hand); a new expansion flow channel is provided at the outlet end of the porous plate, which is concave upwards, has a positive projection similar to the shape of the eye-shaped sealing island in the main body outlet plate directly below, and is connected to the depth-gradient outlet groove at the bottom (in addition to changing the traditional outlet groove of the same depth into the depth-gradient outlet groove, the invention also greatly improves the flow speed and flow rate of the filtered material in the outlet groove area directly above the eye-shaped sealing island from the filter chamber to the post-filter chamber by adding a new expansion flow channel The smooth flow improves the effective filtration area, filtration efficiency and filtration volume of the entire filter chamber, with less residual material when changing the filter screen and faster exhaust speed of the new filter screen, solving the technical problems that the material in the traditional filter chamber is easily blocked in this area and the material melt pressure fluctuates greatly when it is moved out to change the filter screen or returned for exhaust; at the same time, the smooth flow of filtered materials can greatly alleviate the impact of filtered materials on the eye-shaped sealing island (3-1), ensuring the sealing effect and extending the service life of the device; in addition, since the filtered materials do not need to rely on the expansion of the height of the outlet slot to achieve smooth flow, the height of the overall outlet slot can be appropriately reduced to compensate for the increase in the thickness of the porous plate, thereby improving the rigidity, strength and compressive resistance of the porous plate). The concave curved surface of the newly expanded flow channel is formed by the flow from the vertical direction. The newly expanded flow channel has a streamlined design with a jujube core shape, which is formed by connecting the flow channel slope surface I, the flow channel horizontal surface and the flow channel slope surface II in sequence (the jujube core streamlined design is the best shape choice for the material melt flow channel, which is convenient for the smooth flow of materials). In the inner cavity of the newly expanded flow channel, a number of guide ribs extending along the length direction of the main body outlet plate are arranged (on the one hand, the guide ribs have the function of diverting and guiding flow, so that the material can flow orderly and quickly in the inner cavity of the newly expanded flow channel; on the other hand, the guide ribs can improve the rigidity, strength and pressure resistance of the porous plate and extend the service life of the device; in addition, due to the addition of the newly expanded flow channel, the material in the inlet slot area is concentrated, and the guide ribs can be used to hold the material for a short time, so that the material melt in the inlet slot area can be prevented from sagging due to gravity during the process of replacing the filter screen until the screen replacement is completed quickly).

[0011] In the present invention, the maximum depth of the newly expanded flow channel is the position section where the horizontal plane of the flow channel is located, and the maximum depth of the flow channel is equal to the depth of the inlet groove (because the material throughput here is the largest, in order to ensure the smooth flow of materials, the deepest flow channel is designed to be a plane); the depths of the flow channel slope surface I and the flow channel slope surface II are both designed to be gradually changed from zero to the maximum depth of the flow channel (from the outside to the inside until the horizontal plane of the flow channel, the flow rate of the filtered material from the front end to the rear end of the eye-shaped sealing island increases with the increase of the filtration area (the pushing direction of the reciprocating plate is the front end), and the flow channel corresponding to this section is also Gradually deepens, so the depth of flow channel slope Ⅰ changes gradually from zero to the maximum flow channel depth; and when the material flows through the horizontal surface of the flow channel, it must be designed to flow away quickly, without obstacles and without retention. A buffer slope must be designed for the closing, so the horizontal surface of the flow channel is also designed gradually), and the slope of flow channel slope Ⅰ is less than the slope of flow channel slope Ⅱ (the greater the slope of flow channel slope Ⅱ, the greater the material pressure and the flow rate, which meets the flow requirements of rapid, unobstructed and non-retention flow of materials in this section; the smaller the slope of flow channel slope Ⅰ, the smaller the initial material flow rate, which meets the flow requirements of gradually increasing the material flow rate in this section and avoiding retention).

[0012] The orthographic projection annular surfaces of the flow channel slope surface I, the flow channel horizontal surface, and the flow channel slope surface II described in the present invention are coaxial annular surfaces, and the axial annular surface is coaxial with the eye-shaped sealing island in the main body outlet plate directly below in the normal filtering state (only when the orthographic projection annular surfaces of each component in the newly expanded flow channel are coaxial annular surfaces and are arranged coaxially with the eye-shaped sealing island, can the newly expanded flow channel most directly and effectively improve the flow speed and flow smoothness of the filtered material in the outlet groove area directly above the eye-shaped sealing island from the filter chamber to the post-filter chamber, thereby improving the effective filtering area, filtering efficiency and filtering amount of the entire filter chamber, and further solving the technical problem that the material in the traditional filter chamber is easily blocked in this area); at this time, the flow channel horizontal plane is located directly above the outer edge of the eye-shaped sealing island (here is the maximum flow channel depth position of the newly expanded flow channel, the cross-sectional pressure is minimum, and the impact on the outer edge of the eye-shaped sealing island is greatly reduced), and the width of the orthographic projection annular surfaces of the flow channel slope surface I and the flow channel slope surface II spans the inner and outer sides of the outer edge of the eye-shaped sealing island.

[0013] The apertures of the inlet slot and the depth-gradient outlet slot of the filter chamber described in the present invention are smaller than the aperture of the filter screen embedding slot and smaller than the aperture of the porous plate mounting hole (to facilitate smooth installation of the porous plate and ensure that the filter screen is firmly embedded).

[0014] The depth of the depth-gradient outlet groove described in the present invention is gradual without considering the newly expanded flow channel, and its depth gradually deepens from the front end and the rear end to the middle part at the same time (the end where the newly expanded flow channel is located is the front end), the starting point depth is one-third of the end point depth, and the depth end point intersects with the rear end edge of the flow channel slope II (the effect of this design is that when the filter chamber is moved out to change the filter screen, at least the depth-gradient outlet groove is reduced in the process of movement, and the depth of the depth-gradient outlet groove is shallower, which effectively prevents the overflow of the material melt and the reduction of the pressure of the material melt in the chamber after the filter; similarly, when the filter chamber completes the replacement of the filter screen and returns to work, it needs to be exhausted during movement. Since the volume of the gradient outlet groove is smaller, there is less residual material after changing the screen, and the return exhaust speed is The invention is faster, and at this time, in the process of moving, the depth-gradient outlet groove increases with the flow surface of the post-filter chamber, and the depth of the depth-gradient outlet groove also increases from shallow to deep, which has the effect of extruding exhaust, effectively preventing the rapid entry of the material melt and the pressure drop of the material melt in the post-filter chamber). The spatial height design of the terminal depth of the depth-gradient outlet groove is the same as the height design of the traditional outlet groove of the same depth in the conventional screen changing device (because the post-filter material of the present invention does not need to rely on the expansion of the height of the outlet groove to achieve smooth flow, not only does it not need to increase the thickness of the porous plate and the reciprocating plate, reducing consumables and costs, but also the height of the overall outlet groove can be appropriately reduced to compensate for the increase in the thickness of the porous plate, that is, it can also improve the rigidity, strength and compressive resistance of the porous plate).

[0015] The design principle of the present invention is as follows:

[0016] The present invention adds a new expanded flow channel at the outlet end of the porous plate, which is concave upward, has a positive projection similar to the shape of the eye-shaped sealing island in the main body outlet plate directly below, and is connected to the outlet groove at the bottom, and the traditional outlet groove of the same depth is changed into a depth-gradient outlet groove, which greatly improves the flow speed and flow smoothness of the filtered material from the filter chamber to the post-filter chamber in this area, reduces the residual material when changing the screen, and the exhaust speed of the new filter screen is faster, thereby improving the effective filtration area, filtration efficiency and filtration volume of the entire filter chamber, and solves the technical problems that the material in the traditional filter chamber is easily blocked in this area and the pressure fluctuation is large when it is moved out to change the screen or returned for exhaust. More specifically, firstly, the concave curved surface of the newly expanded flow channel added in the present invention is a jujube-core streamlined design formed by connecting the flow channel slope surface I, the flow channel horizontal surface, and the flow channel slope surface II in sequence from the vertical direction, and the jujube-core streamlined design is the best shape choice for the material melt flow channel, which is convenient for the smooth flow of the material; a plurality of guide ribs extending along the length direction of the main body outlet plate are arranged in the inner cavity of the newly expanded flow channel, and the guide ribs not only It has the function of diverting and guiding flow, and can make the material flow in the inner cavity of the newly expanded flow channel in an orderly and rapid manner. On the other hand, the guide ribs can improve the rigidity, strength and pressure resistance of the porous plate and extend the service life of the device. In addition, due to the addition of the newly expanded flow channel, the material in the outlet slot area is concentrated, and the guide ribs can be used to hold the material for a short time, so that the material melt in the outlet slot area can be prevented from sagging due to gravity during the process of replacing the filter screen until the screen replacement is completed quickly; in the present invention, the channel slope surface I, the channel horizontal surface, and the positive projection annular surface of the channel slope surface II in the newly expanded flow channel are coaxial annular surfaces, and the axial annular surface is coaxial with the eye-shaped sealing island in the main body outlet plate directly below in the normal filtering state, so that the newly expanded flow channel can most directly and effectively improve the flow speed and flow smoothness of the filtered material in the outlet slot area directly above the eye-shaped sealing island from the filter chamber to the post-filter chamber, thereby improving the effective filtering area, filtering efficiency and filtering amount of the entire filter chamber, and then solving the technical problem that the material in the traditional filter chamber is easily blocked in this area. Secondly, the depth of the depth-gradient outlet groove of the present invention is gradual without considering the newly expanded flow channel, and its depth gradually deepens from the front end and the rear end to the middle part (the end where the newly expanded flow channel is located is the front end), the starting depth is one third of the end depth, and the depth end intersects with the rear end edge of the flow channel slope II. The spatial height design of the end depth of the depth-gradient outlet groove is the same as the height design of the traditional outlet groove of the same depth in the conventional screen changing device.The effect of the gradual design is that when the filter chamber is moved out to change the filter screen, at least the depth of the gradual outlet groove decreases during the movement, and the depth of the gradual outlet groove becomes shallower, which effectively prevents the overflow of the material melt and the reduction of the pressure of the material melt in the chamber after the filter; similarly, when the filter chamber completes the replacement of the filter screen and returns to work, it needs to be exhausted during movement. Since the volume of the gradual outlet groove is smaller, there is less residual material after the filter screen change, and the return exhaust speed is faster, and at this time, the depth of the gradual outlet groove increases during the movement, and the depth of the gradual outlet groove increases from shallow to deep, which has the effect of squeezing exhaust, effectively preventing the rapid entry of the material melt and the reduction of the pressure of the material melt in the chamber after the filter, and solves the technical problem of large pressure fluctuations when the traditional filter chamber is moved out to change the screen or returned for exhaust. At the same time, the spatial height design of the terminal depth of the depth gradient outlet slot is the same as the height design of the outlet slot of the same depth in the conventional screen changing device. The reason is that the filtered material of the present invention does not need to rely on the expansion of the height of the outlet slot to achieve smooth flow. It not only does not need to increase the thickness of the porous plate and the reciprocating plate, reducing consumables and costs, but also can appropriately reduce the height of the overall outlet slot to compensate for the increase in the thickness of the porous plate, that is, it can also improve the rigidity, strength and pressure resistance of the porous plate. In addition, since the filtered material of the present invention can flow smoothly along the newly expanded flow channel toward the filtered chamber, it can also greatly alleviate the impact of the filtered material on the eye-shaped sealing island, ensure the sealing effect, and extend the service life of the device.

[0017] The beneficial technical effects of the present invention are as follows:

[0018] The present invention greatly improves the flow speed and flow smoothness of the filtered material in the outlet groove area just above the eye-shaped sealing island from the filter chamber to the post-filter chamber by adding a new expanded flow channel and cooperating with a depth-gradient outlet groove, thereby improving the effective filtering area, filtering efficiency and filtering volume of the entire filter chamber, reducing the residual material when changing the screen, and making the exhaust speed of the new filter screen faster, thereby solving the technical problems that the material in the traditional filter chamber is easily blocked in this area and the material melt pressure fluctuates greatly when the filter screen is moved out for replacement or returned for exhaust; at the same time, the smooth flow of the filtered material can greatly alleviate the impact of the filtered material on the eye-shaped sealing island, ensure the sealing effect, and extend the service life of the device; in addition, since the filtered material of the present invention does not need to rely on the expansion of the height of the outlet groove to achieve smooth flow, it is not necessary to increase the thickness of the porous plate and the reciprocating plate, thereby reducing consumables and reducing costs, and the height of the overall outlet groove can be appropriately reduced to compensate for the increase in the thickness of the porous plate, that is, the rigidity, strength and pressure resistance of the porous plate can also be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the use state of the present invention (one reciprocating plate is in the filtering state, and one reciprocating plate is in the screen changing state).

[0020] Figure 2 yes Figure 1 AA section view.

[0021] Figure 3 yes Figure 1 BB cross-sectional view.

[0022] Figure 4 yes Figure 1 CC cross-sectional view.

[0023] Figure 5 yes Figure 4 A partial enlarged view of point D in the middle (i.e., a vertical cross-sectional view of the newly expanded flow channel in the filtering state).

[0024] Figure 6 It is a schematic diagram of the structure of the filtration chamber in the present invention after the filter screen is removed and the holes in the porous plate are hidden.

[0025] Explanation of the part numbers in the figure: 1. Main body inlet plate; 2. Pre-filter chamber; 3. Main body outlet plate, 3-1. Eye-shaped sealing island; 4. Post-filter chamber; 5. Reciprocating plate; 6. Filter chamber, 6-1. Inlet slot; 6-2. Filter screen embedding slot; 6-3. Perforated plate mounting hole; 6-4. Depth gradient outlet slot; 7. Filter screen; 8. Perforated plate; 9. Newly expanded flow channel; 9-1. Flow channel slope Ⅰ; 9-2. Flow channel horizontal surface; 9-3. Flow channel slope Ⅱ; 9-4. Guide rib; 10. Pad strip; 11. Through-hole slide; 12. Herringbone inlet main channel; 13. Herringbone outlet main channel; 14. Oil cylinder. DETAILED DESCRIPTION

[0026] The present invention will be further described below in two embodiments with reference to the accompanying drawings:

[0027] like Figure 1 to Figure 6As shown, a filter chamber with a flow guide structure of the present invention comprises a pre-filter chamber 2 connected to a main body inlet plate 1 at the upper end, a post-filter chamber 4 connected to a main body outlet plate 3 at the lower end, and a filter chamber 6 opened at the left and right center of the front end of a reciprocating plate 5 (on the one hand, the filter chamber 6 is used to embed a filter screen 7 and a porous plate 8; on the other hand, as the reciprocating plate 5 moves to the filtering working position, the filter chamber 6 is connected with the pre-filter chamber 2 and the post-filter chamber 4 to form a filtering flow channel for the material), and a filter screen 7 and a porous plate 8 embedded in the filter chamber from top to bottom (the filter screen 7 and the porous plate 8 are stacked and embedded in the filter chamber 6 of the reciprocating plate 5, and impurities in the material can be filtered through the filter screen 7, and the porous plate 8 is used to support the filter screen 7); the filter chamber 6 is composed of The inlet groove 6-1, the filter screen embedding groove 6-2, the porous plate mounting hole 6-3, and the depth-gradient outlet groove 6-4 constitute a four-step columnar hole structure (the filter screen embedding groove 6-2 is used to embed the filter screen 7; the porous plate mounting hole 6-3 is used to embed the porous plate 8; the inlet groove 6-1 and the depth-gradient outlet groove 6-4 are used as material channels before and after filtration on the one hand, and on the other hand, to avoid surface contact and friction between the porous plate 8 and the main body inlet plate 1 and the main body outlet plate 3); at the outlet end of the porous plate 8, a new expansion flow channel 9 is provided, which is concave upward, has a positive projection similar to the shape of the eye-shaped sealing island 3-1 in the main body outlet plate 3 directly below, and is connected to the depth-gradient outlet groove 6-4 at the bottom (the present invention changes the traditional outlet groove of the same depth into a depth-gradient outlet groove 6-4 in addition to changing the traditional outlet groove of the same depth into a depth-gradient outlet groove 6-4). In addition to the outlet groove 6-4, the newly expanded flow channel 9 is added to greatly improve the flow speed and flow smoothness of the filtered material from the filter chamber 6 to the filtered chamber 4 in the outlet groove area just above the eye-shaped sealing island, thereby improving the effective filtering area, filtering efficiency and filtering volume of the entire filter chamber, reducing the residual material when changing the screen, and the exhaust speed of the new filter screen is faster, thus solving the technical problems that the material in the traditional filter chamber is easily blocked in this area and the material melt pressure fluctuates greatly when the filter screen is moved out for replacement or returned for exhaust; at the same time, the smooth flow of the filtered material can greatly alleviate the impact of the filtered material on the eye-shaped sealing island 3-1, thereby ensuring the sealing effect and extending the service life of the device; in addition, since the filtered material does not need to rely on the expansion of the height of the outlet groove to achieve smooth flow, it can be appropriately reduced. The height of the overall outlet groove is used to compensate for the thickness of the porous plate, thereby improving the rigidity, strength and pressure resistance of the porous plate). The concave curved surface of the newly expanded flow channel 9 is a jujube-core streamlined design formed by the flow channel slope surface Ⅰ9-1, the flow channel horizontal surface 9-2, and the flow channel slope surface Ⅱ9-3 connected in sequence from the vertical direction (the jujube-core streamlined design is the best shape choice for the material melt flow channel, which is convenient for the smooth flow of the material). In the inner cavity of the newly expanded flow channel 9, a plurality of guide ribs 9-4 extending along the length direction of the main body outlet plate are arranged (on the one hand, the guide ribs 9-4 have the function of diverting and guiding, so that the material can flow in the inner cavity of the newly expanded flow channel 9 in an orderly and rapid manner; on the other hand, the guide ribs 9-4 can improve the rigidity, strength and pressure resistance of the porous plate 8, and extend the service life of the device;In addition, the material in the inlet slot 6-1 area is concentrated by adding the new expansion channel 9, and the material can be supported for a short time by means of the guide rib 9-4, so that the material melt in the inlet slot 6-1 area can be prevented from sagging due to gravity during the process of replacing the filter screen 7 until the screen replacement is completed quickly). ;

[0028] In the present invention, the maximum depth of the newly expanded flow channel 9 is the position section where the flow channel horizontal plane 9-2 is located, and the maximum depth of the flow channel is equal to the depth of the inlet groove 6-1 (because the material throughput here is the largest, in order to ensure the smooth flow of materials, the deepest flow channel is designed as a plane); the depths of the flow channel slope surface I 9-1 and the flow channel slope surface II 9-3 are both designed to be gradually changed from zero to the maximum depth of the flow channel (from the outside to the inside until the flow channel horizontal plane 9-2, the flow rate of the filtered material from the front end to the rear end of the eye-shaped sealing island 3-1 increases with the increase of the filtration area (the pushing direction of the reciprocating plate 5 is the front end), and the flow channel corresponding to this section is also Gradually deepens, so the depth of the flow channel slope surface Ⅰ9-1 changes gradually from zero to the maximum flow channel depth; and when the material flows through the flow channel horizontal surface 9-2, a buffer slope must be designed to close in order to flow away quickly, without obstacles and without retention, so the flow channel horizontal surface 9-2 is also designed gradually), and the slope of the flow channel slope surface Ⅰ9-1 is smaller than the slope of the flow channel slope surface Ⅱ9-3 (the greater the slope of the flow channel slope surface Ⅱ9-3, the greater the material pressure and the flow rate, which meets the flow requirements of rapid, unobstructed and non-retention flow of the material in this section; the smaller the slope of the flow channel slope surface Ⅰ9-1, the smaller the initial material flow rate, which meets the flow requirements of gradually increasing the material flow rate in this section and avoiding retention).

[0029] The orthographic projection annular surfaces of the flow channel slope surface I 9-1, the flow channel horizontal surface 9-2, and the flow channel slope surface II 9-3 described in the present invention are coaxial annular surfaces, and the axial annular surface is coaxial with the eye-shaped sealing island 3-1 in the main body outlet plate 3 directly below in the normal filtering state (only when the orthographic projection annular surfaces of each component in the newly expanded flow channel 9 are coaxial annular surfaces and are arranged coaxially with the eye-shaped sealing island 3-1, can the newly expanded flow channel 9 most directly and effectively improve the flow velocity and flow rate of the filtered material in the outlet slot area directly above the eye-shaped sealing island from the filter chamber to the post-filter chamber). The smoothness of the flow is improved, thereby increasing the effective filtration area, filtration efficiency and filtration volume of the entire filter chamber, and further solving the technical problem that materials in the traditional filter chamber are easily blocked in this area); at this time, the flow channel horizontal plane 9-2 is located directly above the outer edge of the eye-shaped sealing island 3-1 (this is the position where the flow channel depth of the newly expanded flow channel 9 is at its maximum value, and the cross-sectional pressure is minimum, which greatly reduces the impact on the outer edge of the eye-shaped sealing island 3-1), and the width of the positive projection annular surface of the flow channel slope surface I 9-1 and the flow channel slope surface II 9-3 spans the inner and outer sides of the outer edge of the eye-shaped sealing island 3-1.

[0030] The apertures of the inlet slot 6-1 and the depth-gradient outlet slot 6-4 of the filter chamber 6 in the present invention are smaller than the aperture of the filter screen embedding slot 6-2 and smaller than the aperture of the porous plate mounting hole 6-3 (to facilitate the smooth installation of the porous plate 8 and ensure that the filter screen 7 is firmly embedded).

[0031] The depth of the depth-gradient outlet groove 6-4 described in the present invention is gradual without considering the newly expanded flow channel 9, and its depth gradually deepens from the front end and the rear end to the middle part at the same time (the end where the newly expanded flow channel 9 is located is the front end), the starting depth is one-third of the end depth, and the depth end intersects with the rear end edge of the flow channel slope II 9-3 (the effect of this design is: when the filter chamber 6 is moved out to change the filter screen, at least the depth-gradient outlet groove 6-4 is reduced in the process of movement, and the depth of the depth-gradient outlet groove 6-4 is shallower, which effectively prevents the overflow of the material melt and the reduction of the pressure of the material melt in the filter chamber 4; similarly, when the filter chamber 6 is replaced and the return work is completed, it is necessary to exhaust during the movement. Since the volume of the gradient outlet groove 6-4 is smaller, there is less residual material for changing the screen, and the return The exhaust speed is faster, and at this time, the depth-gradient outlet groove 6-4 increases with the flow surface of the post-filter chamber 4 during the movement, and the depth of the depth-gradient outlet groove 6-4 also increases from shallow to deep, which has the effect of squeezing exhaust, effectively preventing the rapid entry of the material melt and the pressure drop of the material melt in the post-filter chamber 4). The spatial height design of the terminal depth of the depth-gradient outlet groove 6-4 is the same as the height design of the traditional outlet groove of the same depth in the conventional screen changing device (because the post-filter material of the present invention does not need to rely on the expansion of the height of the outlet groove to achieve smooth flow, not only does it not need to increase the thickness of the porous plate and the reciprocating plate, reducing consumables and costs, but also the height of the overall outlet groove can be appropriately reduced to compensate for the increase in the thickness of the porous plate, that is, it can also improve the rigidity, strength and compressive resistance of the porous plate).

[0032] The specific use of the present invention is as follows:

[0033] First, assemble the various components of the present invention according to the above structural description - that is, first embed the porous plate 8 in the porous plate mounting hole 6-3 in the filter chamber 6 of the reciprocating plate 5 to support the filter screen 7, and then embed the filter screen 7 in the filter screen embedding groove 6-2 in the filter chamber 6; then, the two reciprocating plates 5 are respectively inserted as a whole into the two through-hole slide grooves 11 composed of the main body inlet plate 1 and the main body outlet plate 3 and the matching gasket strip 10. After being inserted into place, the filter chamber 6 in the reciprocating plate 5 is connected with the pre-filter chamber 2 in the main body inlet plate 1 and the post-filter chamber 4 in the main body outlet plate 3 to form a filter channel.

[0034] During the first normal filtering operation, the valve controlling the external feed pipe is opened, and the plastic melt containing impurities enters the herringbone inlet main channel 12 in the non-stop screen changing device from the external feed pipe, and is diverted to the two pre-filter chambers 2 along the herringbone inlet main channel 12, and then flows through the filter chambers 6 in their respective corresponding reciprocating plates 5 for impurity filtering - that is, the material melt flows through the filter screen 7 and the porous plate 8 embedded in the filter chamber from top to bottom in turn to filter out impurities, and the clean material melt after filtration flows out of the porous plate 8 and merges into the depth gradient outlet groove 6-4 of the filter chamber 6, and then flows into the post-filter chamber 4, and then flows out along the herringbone outlet main channel 13 in the non-stop screen changing device, and finally enters the external discharge pipe. The invention provides a new expansion flow channel 9 at the outlet end of the porous plate 8, which is concave upwards, has a positive projection similar to the shape of the eye-shaped sealing island 3-1 in the main body outlet plate 3 directly below, and is connected to the depth-gradient outlet groove 6-4 at the bottom, which greatly improves the flow speed and flow smoothness of the filtered material from the filter chamber to the post-filter chamber in the outlet groove area directly above the eye-shaped sealing island, improves the effective filtering area, filtering efficiency and filtering amount of the entire filter chamber, has less residual material when changing the screen, and has a faster exhaust speed for the new filter screen, which solves the problem that the material in the traditional filter chamber is easily trapped in this area Technical difficulties in clogging in the area and large pressure fluctuations of the material melt when the filter is removed or returned for exhaust - more specifically, first, the concave curved surface of the newly expanded flow channel 9 added in the present invention is a jujube-core streamlined design formed by the flow channel slope surface Ⅰ9-1, the flow channel horizontal surface 9-2, and the flow channel slope surface Ⅱ9-3 connected in sequence from the vertical direction, and the jujube-core streamlined design is the best shape choice for the material melt flow channel, which is convenient for the smooth flow of the material; a plurality of guide ribs 9-4 extending along the length direction of the main body outlet plate are arranged in the inner cavity of the newly expanded flow channel 9, and the guide ribs 9-4 are not It only has the function of diverting and guiding, which can make the material flow in the inner cavity of the newly expanded flow channel 9 in an orderly and rapid manner. On the other hand, the guide rib 9-4 can improve the rigidity, strength and pressure resistance of the porous plate and extend the service life of the device. In addition, due to the addition of the newly expanded flow channel 9, the material in the outlet slot area is concentrated, and the guide rib 9-4 can be used to hold the material for a short time, so that the material melt in the outlet slot area can avoid sagging due to gravity during the process of replacing the filter screen until the screen is quickly replaced; in the present invention, the flow channel slope surface I 9-1 and the flow channel horizontal surface 9-2 in the newly expanded flow channel 9 are added. , the positive projection annular surface of the flow channel slope II9-3 is a coaxial annular surface, and the axial annular surface is coaxial with the eye-shaped sealing island 3-1 in the main body outlet plate 3 directly below in the normal filtering state. In this way, the newly expanded flow channel can most directly and effectively improve the flow velocity and flow smoothness of the filtered material in the outlet groove area directly above the eye-shaped sealing island 3-1 from the filter chamber 6 to the post-filter chamber 4, thereby improving the effective filtering area, filtering efficiency and filtering amount of the entire filter chamber, and further solving the technical problem that the material in the traditional filter chamber is easily blocked in this area.Secondly, the depth of the depth-gradient outlet groove 6-4 of the present invention is gradual without considering the newly expanded flow channel 9, and its depth gradually deepens from the front end and the rear end to the middle part (the end where the newly expanded flow channel 9 is located is the front end), and the starting depth is one third of the end depth. The depth end intersects with the rear end edge of the flow channel slope II 9-3. The spatial height design of the end depth of the depth-gradient outlet groove 6-4 is the same as the height design of the traditional outlet groove of the same depth in the conventional screen changing device. The effect of the gradual design is that when the filter chamber 6 is moved out to change the filter screen, at least the depth of the gradual outlet groove 6-4 is reduced in the process of movement, and the depth of the gradual outlet groove 6-4 is shallower, which effectively prevents the overflow of the material melt and the reduction of the pressure of the material melt in the chamber after the filter; similarly, when the filter chamber completes the replacement of the filter screen 7 and returns to work, it needs to be exhausted during movement. Since the volume of the gradual outlet groove 6-4 is smaller, there is less residual material after the filter screen change, and the return exhaust speed is faster, and at this time, the depth of the gradual outlet groove 6-4 is increased in the process of movement, and the depth of the gradual outlet groove is also from shallow to deep, which has the effect of squeezing exhaust, effectively preventing the rapid entry of the material melt and the reduction of the pressure of the material melt in the chamber after the filter, and solves the technical problem of large pressure fluctuations when the traditional filter chamber is moved out to change the screen or returned for exhaust. At the same time, the spatial height design of the terminal depth of the depth gradient outlet slot 6-4 is the same as the height design of the outlet slot of the same depth in the conventional screen changing device. The reason is that the filtered material of the present invention does not need to rely on the expansion of the height of the outlet slot to achieve smooth flow. It is not only unnecessary to increase the thickness of the porous plate 8 and the reciprocating plate 5, reducing consumables and costs, but also the height of the overall outlet slot can be appropriately reduced to compensate for the increase in the thickness of the porous plate 8, that is, it can also improve the rigidity, strength and pressure resistance of the porous plate 8. In addition, since the filtered material of the present invention can flow smoothly along the newly expanded flow channel 9 toward the filtered chamber 4, it can also greatly alleviate the impact of the filtered material on the eye-shaped sealing island 3-1, ensure the sealing effect, and extend the service life of the device.

[0035] When the filter screen 7 is clogged and needs to be replaced, the other reciprocating plate 5 and the filter channel continue to work. The reciprocating plate 5 to be replaced is pushed forward to the screen changing position under the action of the oil cylinder 14, and the corresponding filter channel is closed at the same time. After the dirty filter screen 7 is removed and replaced with a clean filter screen 7, it is pulled back to the working position. In addition, during the screen changing process, the material in the depth gradient outlet groove 6-4 area is concentrated due to the addition of the new expansion channel 9. The material can be supported for a short time with the help of the guide rib 9-4, which can prevent the material melt in the depth gradient outlet groove 6-4 area from sagging due to gravity during the process of replacing the filter screen until the screen change is completed quickly. Repeat the operation to replace the filter screen 7 in another reciprocating plate 5. In this way, it is convenient and fast to achieve non-stop screen change and ensure normal continuous production.

Claims

1. A filter chamber with a flow guide structure, characterized in that: The filter chamber comprises a pre-filter chamber (2) whose upper end is connected to a main body inlet plate (1), a post-filter chamber (4) whose lower end is connected to a main body outlet plate (3), and a filter chamber (6) located at the left and right center of the front end of the reciprocating plate (5), and a filter screen (7) and a porous plate (8) embedded in the filter chamber from top to bottom; the filter chamber (6) is a four-step columnar hole structure consisting of an inlet slot (6-1), a filter screen embedding slot (6-2), a porous plate mounting hole (6-3), and a depth-gradient outlet slot (6-4); in the porous plate ( The outlet end of the expansion channel (8) is provided with a new expansion channel (9) which is concave upwards, has a shape similar to the eye-shaped sealing island (3-1) in the main body outlet plate (3) directly below, and is connected to the depth gradient outlet groove (6-4) at the bottom. The concave curved surface of the new expansion channel (9) is a jujube-core streamlined design formed by connecting the channel slope surface I (9-1), the channel horizontal surface (9-2), and the channel slope surface II (9-3) in sequence when viewed from the vertical direction. A plurality of guide ribs (9-4) extending along the length direction of the main body outlet plate are provided in the inner cavity of the new expansion channel (9); The maximum flow depth in the newly expanded flow channel (9) is the location of the flow channel horizontal plane (9-2), and the maximum flow channel depth is equal to the depth of the inlet groove (6-1); the depths of the flow channel slope surface I (9-1) and the flow channel slope surface II (9-3) are both designed to gradually change from zero to the maximum flow channel depth, and the slope of the flow channel slope surface I (9-1) is less than the slope of the flow channel slope surface II (9-3); the positive projection annular surfaces of the flow channel slope surface I (9-1), the flow channel horizontal plane (9-2), and the flow channel slope surface II (9-3) are coaxial annular surfaces, and the axial annular surface is coaxial with the eye-shaped sealing island (3-1) in the main body outlet plate (3) directly below in the normal filtering state; at this time, the flow channel horizontal plane The surface (9-2) is located directly above the outer edge of the eye-shaped sealing island (3-1), and the width of the positive projection annular surface of the flow channel slope surface I (9-1) and the flow channel slope surface II (9-3) spans the inner and outer sides of the outer edge of the eye-shaped sealing island (3-1); the depth of the depth-gradient outlet groove (6-4) is gradual without considering the newly expanded flow channel (9), and its depth gradually deepens from the front end and the rear end to the middle part at the same time, and the starting depth is one third of the end depth, and the depth end intersects with the rear end edge of the flow channel slope surface II (9-3). The spatial height design of the end depth of the depth-gradient outlet groove (6-4) is the same as the height design of the traditional outlet groove of the same depth in a conventional screen changing device.

2. The filter chamber with a flow guide structure according to claim 1, characterized in that: The apertures of the inlet slot (6-1) and the depth-gradient outlet slot (6-4) of the filter chamber (6) are both smaller than the aperture of the filter screen embedding slot (6-2) and smaller than the aperture of the porous plate mounting hole (6-3).

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