Double-screw granulation melt filter

Abstract

The utility model discloses a twin-screw granulation melt filter, which comprises a box body and is characterized in that a first filter chamber and a second filter chamber which are distributed left and right are arranged in the box body, a medium outlet and a medium inlet are arranged on the box body, and pressure detectors are respectively arranged at the medium outlet and the medium inlet. The outer end of the medium inlet is communicated with a melt extrusion opening of the double-screw extruder, the inner end of the medium inlet is communicated with an inlet of the booster pump, the corresponding booster pump is arranged in the box body and provided with a motor and a frequency converter control system of the motor, the frequency converter control system is in signal connection with the pressure detector, and the motor is arranged at the upper end of the box body. The outlet of the booster pump is communicated with the inlets of the first filter chamber and the second filter chamber through a three-way A switching valve; and the medium outlet is communicated with the outlets of the first filter chamber and the second filter chamber through a three-way B switching valve. The frequency converter control system controls the conveying pressure of the booster pump through inlet and outlet pressure signal feedback, and the pressure requirement of a double-screw granulation system is met.

Description

Technical Field

[0001] The utility model relates to an improved invention of a filter, in particular to an improved invention of a twin-screw granulation melt filter. Background Art

[0002] The granulation melt of a twin-screw extruder needs to be filtered through a filter, and the melt passing through the filter needs to have a certain pressure, and filtration is achieved under the action of the pressure. However, the extrusion pressure of the twin-screw extruder is relatively low, because when the pressure is too high, the screw will automatically trip to protect it, resulting in unstable conveying pressure of the melt filter, so the pressure requirement of the melt filter cannot be met. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a twin-screw granulation melt filter.

[0004] To solve the above technical problem, the utility model is implemented by adopting the following technical scheme: the twin-screw granulation melt filter includes a box body, and is characterized in that: a first filtration chamber and a second filtration chamber are arranged left and right in the box body, a medium outlet and a medium inlet are arranged on the box body, pressure detectors are respectively arranged at the medium outlet and the medium inlet, the outer end of the medium inlet is communicated with the melt extrusion outlet of the twin-screw extruder, the inner end of the medium inlet is communicated with the inlet of a booster pump, the corresponding booster pump is arranged in the box body, the booster pump is equipped with a motor and its frequency converter control system, and the frequency converter control system is connected with the pressure detector by signal, the motor is arranged at the upper end of the box body, the outlet of the booster pump is communicated with the inlets of the first filtration chamber and the second filtration chamber through a three-way A switching valve, and the medium outlet is communicated with the outlets of the first filtration chamber and the second filtration chamber through a three-way B switching valve.

[0005] Both the three-way A switching valve and the three-way B switching valve are three-way switching valves driven by a handwheel.

[0006] The box body is a heat-insulating box body.

[0007] The beneficial effect of the utility model is that for the improved twin-screw granulation melt filter, a booster pump with a constant conveying pressure and inlet and outlet pressure detectors are arranged at the inlet end of the filter to match the pressure requirement of the twin-screw granulation system, and the frequency converter control system controls the conveying pressure of the booster pump through the feedback of the inlet and outlet pressure signals; the booster pump is arranged inside the filter body, and the motor is also arranged above the filter, which has the technical characteristics of compact structure, convenient heating and convenient operation. Description of the Drawings

[0008] The following further details the specific implementation manners of the utility model with reference to the drawings.

[0009] Figure 1 It is a structural schematic diagram of the utility model.

[0010] Figure 2 This is the side view of the structure of the present utility model.

[0011] Figure 3 This is the top view of the structure of the present utility model. Specific embodiments

[0012] The attached drawings show the structure of the present utility model, and the relevant details will be further described below in conjunction with the attached drawings. In this embodiment, refer to the attached Figures 1-3 , the twin-screw granulation melt filter includes a box body 1 with a heating structure inside for ensuring that the filtered melt is in a molten state. A first filtration chamber 2 and a second filtration chamber 3 are arranged left and right in the box body 1. A medium outlet 4 and a medium inlet 5 are provided on the box body 1. Pressure detectors are respectively provided at the medium outlet 4 and the medium inlet 5. The outer end of the medium inlet 5 is communicated with the melt extrusion outlet of the twin-screw extruder, and the inner end of the medium inlet 5 is communicated with the inlet of a booster pump 6. The corresponding booster pump 6 is arranged inside the box body 1 to play a role in heating and heat preservation. The booster pump 6 is equipped with a motor 7 and its frequency converter control system, and the frequency converter control system is signal-connected to the pressure detectors. The motor 7 is arranged at the upper end of the box body 1, with a compact structure and convenient operation. The outlet of the booster pump 6 is communicated with the inlets of the first filtration chamber 2 and the second filtration chamber 3 through a three-way A switching valve 8. The medium outlet 4 is communicated with the outlets of the first filtration chamber 2 and the second filtration chamber 3 through a three-way B switching valve 9. The frequency converter control system is used to control the boosting magnitude of the booster pump 6, which is a conventional structure and will not be specifically described here.

[0013] The working principle of the present utility model is as follows: First, the three-way A switching valve 8 and the three-way B switching valve 9 are switched in advance to select the use of the first filtration chamber 2 or the second filtration chamber 3. Then, the melt extruded by the twin-screw extruder enters the booster pump 6 through the medium inlet 5. The booster pump 6 is driven by the motor 7, and the frequency converter control system realizes the constant-pressure control of the melt through the pressure signals fed back by the pressure detectors at the medium outlet 4 and the medium inlet 5 to meet the melt filtration pressure requirements of the filter and match the pressure requirements of the twin-screw granulation system. Finally, the boosted melt enters the first filtration chamber 2 or the second filtration chamber 3 to complete the filtration and is then discharged through the medium outlet 4.

[0014] As a specific embodiment of further improvement, both the three-way A switching valve 8 and the three-way B switching valve 9 are handwheel-driven three-way switching valves, which are stable and reliable and are used to switch the use of the first filtration chamber 2 or the second filtration chamber 3.

[0015] As a specific embodiment of further improvement, the box body 1 is a heat-insulating box body 1, which better ensures that the filtered melt is in a molten state in the filtration chamber and the booster pump 6.

[0016] In summary, the above is only the preferred embodiment of the present utility model and is not intended to limit the protection scope of the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. Twin-screw granulation melt filter, including a box, characterized in that: The box body is provided with a first filter chamber and a second filter chamber distributed on the left and right, and a medium outlet and a medium inlet are provided on the box body. The medium outlet and the medium inlet are respectively provided with pressure detectors. The outer end of the medium inlet is connected to the melt extrusion port of the twin-screw extruder, and the inner end of the medium inlet is connected to the inlet of the booster pump. The corresponding booster pump is arranged in the box body, and the booster pump is equipped with a motor and its inverter control system, and the inverter control system is connected to the pressure detector signal. The motor is arranged at the upper end of the box body, and the booster pump outlet is connected to the inlet of the first filter chamber and the second filter chamber via a three-way A switching valve, and the medium outlet is connected to the outlet of the first filter chamber and the second filter chamber via a three-way B switching valve.

2. The twin-screw granulation melt filter according to claim 1, characterized in that: The three-way A switching valve and the three-way B switching valve are both handwheel-driven three-way switching valves.

3. The twin-screw granulation melt filter according to claim 1, characterized in that: The box body is a heat-insulating box body.

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