Screen changer for extrusion granulation system

Abstract

A screen changer for an extrusion granulation system comprises a shell, two through holes for sliding columns to penetrate through are formed in the shell, the two through holes are vertically and symmetrically distributed in a spaced mode, and a feeding port and a discharging port are formed in the positions, on the two sides of the plane where the center lines of the two through holes are located, of the outer wall of the shell respectively. And branch runners are arranged between the feed port and the side walls of the two through holes and between the discharge port and the side walls of the two through holes, so that materials can flow through the screen exchanger and are filtered as long as the radial runner of one sliding column is aligned with the branch runners, and at the moment, the other sliding column can move to the radial runner to extend out of the shell, so that the materials can be filtered. And the plurality of filter screens in the radial flow channel are respectively mounted on the cup-shaped bracket in a pluggable manner, so that the filter screens can be replaced in a pluggable manner under the condition that the screen changer is not stopped, fasteners such as bolts are not needed in the replacement process of the filter screens, and the operation is simple and convenient. A heat source runner is machined in the shell, cold water jackets are installed at the two ends of the installation sliding column, melt is automatically sealed after being cooled and solidified, and material leakage is effectively prevented.

Description

Technical Field

[0001] The utility model relates to the field of extrusion granulation systems, in particular to a screen changer used in extrusion granulation systems. Background Art

[0002] The mixing, extrusion, and granulation unit mixes, plasticizes, extrudes, pelletizes, separates, and dries materials, ultimately processing them into uniform pellets. The extrusion granulation system is a key component of the mixing, extrusion, and granulation unit, primarily consisting of a melt gear pump, screen changer, die plate, and pelletizer. The molten material is conveyed by the melt gear pump, first passes through the screen changer for filtration, then passes through the die plate and enters the pelletizer as strips. The pelletizer's cutter disc cuts the material into pellets and carries them away in the water flow. The screen changer primarily consists of a housing, a slide column, and a filter screen. After the gear pump generates pressure, the material passes through the screen changer to remove impurities before being extruded through the die body and die plate. Existing screen changers are prone to material leakage, and when the filter screen becomes clogged and needs to be replaced, the machine must be shut down for replacement, impacting production efficiency. Utility Model Content

[0003] The utility model aims to provide a screen changer for an extrusion granulation system, which can realize the replacement of the filter screen without stopping the machine and prevent material leakage.

[0004] The technical solution adopted by the utility model to solve the above-mentioned technical problems is: a screen changer for an extrusion granulation system, comprising a shell, wherein two through holes for passing sliding posts are provided in the shell, and the two through holes are symmetrically spaced apart in an upper and lower direction, and an outer wall of the shell located on both sides of the plane where the center lines of the two through holes are located is respectively provided with a feed port and a discharge port, and a branch channel is provided between the feed port and the side walls of the two through holes, and between the discharge port and the side walls of the two through holes; the outer wall of the shell is connected to the support plate through a plurality of support rods, and two oil cylinders are installed on the support plate, and the piston rods of the oil cylinders pass through the support plate and are connected to the limit plate, and the two limit plates are respectively installed at the ends of the two sliding posts, and the limit plate extends radially toward one of the support rods and semi-encloses one side of the support rod through the U-shaped opening, thereby preventing the limit plate from rotating relative to the support rod;

[0005] A radial flow channel is respectively provided in the middle of the two sliding columns, and a porous card plate is installed in the radial flow channel. A plurality of cup-shaped brackets are screwed on the multiple threaded through holes of the porous card plate, and a cup-shaped filter is detachably sleeved on the outer side of the cup-shaped bracket. The multiple filter screens are parallel to each other and distributed in an array. The piston rod can drive the sliding column to move to the radial flow channel and align and connect with the two branch channels at the same time, so that the multiple filter screens can cooperate to filter the material. The piston rod can also drive the sliding column to move to the radial flow channel and extend from the shell to facilitate the plugging and replacement of the filter screen; a heat source flow channel for heating the material is provided in the shell, and two cold water jackets are provided on the sliding column. The two cold water jackets are respectively installed on the outer walls on both sides of the shell, and a cooling flow channel for cooling the sliding column is provided in the cold water jacket.

[0006] Preferably, a plurality of sensors are mounted on the piston rod.

[0007] According to the above technical solution, the beneficial effects of the utility model are:

[0008] The utility model is equipped with two sliding posts, and the through holes where the two sliding posts are located are connected to the inlet and outlet through two branch channels respectively. During operation, only the radial flow channel of one of the sliding posts needs to be aligned with the branch channel, and the material can flow through the screen changer and be filtered, while the other sliding post can move to the radial flow channel and extend from the shell, and the multiple filter screens in the radial flow channel can be plugged and installed on the cup-shaped bracket respectively. Therefore, the filter screen can be plugged and replaced without stopping the screen changer. The replacement process of the filter screen does not require fasteners such as bolts, and the operation is simple.

[0009] The utility model installs a limit plate at the end of the sliding column, and the limit plate semi-encloses one side of the support rod through the U-shaped opening to prevent the limit plate from rotating relative to the support rod, thereby ensuring that the port of the radial flow channel of the sliding column is always aligned with the branch channel, ensuring that the flow channel is unobstructed.

[0010] The utility model has a heat source flow channel processed inside the shell, and cold water jackets are installed at both ends of the sliding column. The heating effect of the heat source flow channel can maintain the melt temperature and make the melt have better fluidity. The cold water jacket can cool the melt leaking from the gap between the sliding column and the shell, so that the melt cools and solidifies and seals itself, effectively preventing material leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a main schematic diagram of the screen changer;

[0012] Figure 2 for Figure 1 AA cross-sectional view of ;

[0013] Figure 3 Schematic diagram of the position of the limit plate.

[0014] Markings in the figure: 1. Shell, 2. Sliding column, 3. Support rod, 4. Support plate, 5. Cylinder, 6. Piston rod, 7. Sensor, 8. Limit plate, 9. Cold water jacket, 10. Feed port, 11. Discharge port, 12. Branch channel, 13. Multi-porous card plate, 14. Cup-shaped bracket, 15. Heat source flow channel. DETAILED DESCRIPTION

[0015] With reference to the accompanying drawings, the specific implementation is as follows:

[0016] like Figure 1 As shown, a screen changer for an extrusion granulation system includes a shell 1. Two through holes for passing a slide column 2 are provided in the shell 1. The two through holes are symmetrically spaced apart in an upper and lower direction. A feed port 10 and a discharge port 11 are respectively provided on the outer wall of the shell 1 on both sides of the plane where the center lines of the two through holes are located. A diversion channel 12 is provided between the feed port 10 and the side walls of the two through holes, and between the discharge port 11 and the side walls of the two through holes.

[0017] like Figure 1 、 3 As shown, the outer wall of the shell 1 is connected to the support plate 4 through a plurality of support rods 3, and two oil cylinders 5 are installed on the support plate 4. The piston rods 6 of the oil cylinders 5 pass through the support plate 4 and are connected to the limit plates 8. The two limit plates 8 are respectively installed at the ends of the two sliding columns 2. The limit plate 8 extends radially toward one of the support rods 3 and is semi-enclosed on one side of the support rod 3 through a U-shaped opening, thereby preventing the limit plate 8 from rotating relative to the support rod 3.

[0018] Figure 2 As shown, radial flow channels are respectively defined in the middle of the two slide posts 2. A porous card 13 is installed in the radial flow channels. Multiple cup-shaped brackets 14 are screwed onto the multiple threaded through holes of the porous card 13. A cup-shaped filter screen is removably mounted on the outer side of the cup-shaped bracket 14. The multiple filter screens are arranged parallel to each other and arranged in an array. The piston rod 6 can drive the slide post 2 to move until the radial flow channel is aligned and connected to the two branch channels 12, allowing the multiple filter screens to cooperate in filtering the material. The piston rod 6 can also drive the slide post 2 to move until the radial flow channel extends from the housing 1, facilitating the insertion and removal of the filter screens. In this embodiment, multiple sensors 7 are also installed on the piston rod 6 to facilitate monitoring the movement position of the slide post 2.

[0019] A heat source flow channel 15 for heating the material is provided in the shell 1, and two cold water jackets 9 are provided on the slide column 2. The two cold water jackets 9 are respectively installed on the outer walls on both sides of the shell 1. A cooling flow channel for cooling the slide column 2 is provided in the cold water jacket 9. The heating effect of the heat source flow channel 15 can maintain the melt temperature and make the melt have better fluidity. The cold water jacket 9 can cool the melt leaking from the gap between the slide column 2 and the shell 1, so that the melt cools and solidifies and seals itself, effectively preventing material leakage.

[0020] During operation, only the radial flow channel of one of the slide posts 2 needs to be aligned with the branch channel 12, and the material can flow through the screen changer and be filtered. At this time, the other slide post 2 can move to the radial flow channel and extend from the shell 1, and the multiple filter screens in the radial flow channel can be plugged in and installed on the cup-shaped bracket 14 respectively. Therefore, the filter screens can be plugged in and replaced without stopping the screen changer. The replacement process of the filter screen does not require fasteners such as bolts, and the operation is simple.

Claims

1. A screen changer for an extrusion granulation system, characterized by: The invention comprises a shell (1), wherein two through holes for passing through the slide column (2) are provided in the shell (1), the two through holes are symmetrically spaced apart from each other, and the outer wall of the shell (1) located on both sides of the plane where the center lines of the two through holes are located is respectively provided with a feed port (10) and a discharge port (11), and a diversion channel (12) is provided between the feed port (10) and the side walls of the two through holes, and between the discharge port (11) and the side walls of the two through holes; the outer wall of the shell (1) is connected to the support plate (4) through a plurality of support rods (3), and two oil cylinders (5) are installed on the support plate (4), and the piston rods (6) of the oil cylinders (5) pass through the support plate (4) and are connected to the limit plates (8), and the two limit plates (8) are respectively installed at the ends of the two slide columns (2), and the limit plates (8) extend radially toward one of the support rods (3) and semi-enclose one side of the support rod (3) through the U-shaped opening, thereby preventing the limit plates (8) from rotating relative to the support rod (3); The middle of the two slide columns (2) are respectively provided with radial flow channels, and a porous card plate (13) is installed in the radial flow channels. A plurality of cup-shaped brackets (14) are screwed on the plurality of threaded through holes of the porous card plate (13). The outer side of the cup-shaped bracket (14) is detachably sleeved with a cup-shaped filter screen. The plurality of filter screens are parallel to each other and arranged in an array. The piston rod (6) can drive the slide column (2) to move to the radial flow channel and align and connect with the two branch flow channels (12) at the same time, so that the plurality of filter screens can cooperate to filter the material. The piston rod (6) can also drive the slide column (2) to move to the radial flow channel extending from the shell (1) so as to facilitate the plugging and replacement of the filter screen. A heat source flow channel (15) for heating the material is provided in the shell (1). Two cold water jackets (9) are sleeved on the slide column (2). The two cold water jackets (9) are respectively installed on the outer walls of both sides of the shell (1). A cooling flow channel for cooling the slide column (2) is provided in the cold water jacket (9).

2. The screen changer for an extrusion granulation system according to claim 1, characterized in that: A plurality of sensors (7) are mounted on the piston rod (6).

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