Vacuum filtering device of screw extruder

Abstract

The utility model belongs to the technical field of extruders, and particularly relates to a vacuum filtering device of a screw extruder, which comprises a pipe body, an inlet end of the pipe body is connected with a first pipeline of the extruder through a first detachable structure, an outlet end of the pipe body is connected with a second pipeline of a vacuum pump water tank through a second detachable structure, and the pipe body is provided with a filtering channel and a chilled water channel. The chilled water channel is located on the peripheral side of the filtering channel, a water inlet and a water outlet which are communicated with the chilled water channel are formed in the pipe body, and chilled water is injected into the water inlet to enter the chilled water channel to cool the filtering channel; the filter channel is communicated with the first pipeline and the second pipeline, a filter mesh bag is arranged in the filter channel, and an opening of the filter mesh bag faces the first pipeline. The device effectively prevents the blockage problem of the vacuum pipeline, and ensures the normal operation of the extruder and the quality of plastic products. When cleaning or maintenance is needed, due to the fact that a detachable structure is adopted, the whole vacuum filtering device can be easily detached, and cleaning work can be conveniently and rapidly completed.

Description

Technical Field

[0001] The utility model belongs to the technical field of extruders, and in particular relates to a vacuum filtering device for a screw extruder. Background Art

[0002] Plastics have the advantages of low density, corrosion resistance, good insulation, and easy molding and processing. In practice, it is found that through the blending and modification technology, special properties can be given to plastic materials and the application range of plastics can be broadened. This process generally requires the use of a screw extruder to heat, melt, extrude, cool, shape, and pelletize the formulated materials to obtain modified plastic particles that meet various needs. Among them, in the process of heating, melting and extruding the materials, a vacuum system is required to apply a certain degree of vacuum to remove some volatile substances and water vapor at high temperatures, etc., to make the materials more compact. If some materials are not vacuumed well, they will break during cold drawing, or the materials will be hydrolyzed due to insufficient water vapor extraction, which will have an adverse effect on the various properties of the product.

[0003] The vacuum systems of screw extruders currently on the market are all directly connected to vacuum pumps via pipes to achieve the purpose of vacuuming. Volatile substances at high temperatures will solidify and adhere to the inner wall of the vacuum pipe when they are cooled. Due to long-term operation of the equipment, volatile substances continue to accumulate in the vacuum pipe, causing blockage in the vacuum system. When cleaning, the entire vacuum system needs to be disassembled for cleaning, which brings great trouble to the cleaning work. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] The utility model mainly aims at the above problems and proposes a vacuum filtering device for a screw extruder, the purpose of which is to solve the problem that the vacuum pipeline is easy to be blocked and difficult to clean.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned purpose, the utility model provides a screw extruder vacuum filtration device, including a tube body, the inlet end of the tube body is connected to the first pipe of the extruder through a first detachable structure, and the outlet end of the tube body is connected to the second pipe of the vacuum pump water tank through a second detachable structure, wherein the tube body has a filtration channel and a chilled water channel, the chilled water channel is located on the circumference of the filtration channel, and the tube body is provided with a water inlet and a water outlet connected to the chilled water channel, so as to inject chilled water into the chilled water channel through the water inlet to cool the filtration channel; the filtration channel is connected to the first pipe and the second pipe, and a filter mesh bag is provided in the filtration channel, and the opening of the filter mesh bag faces the first pipe.

[0008] Furthermore, a filter bag frame is arranged inside the filter mesh bag.

[0009] Furthermore, the filter bag skeleton includes an upper ring seat, and a plurality of cross-arranged U-shaped rods are arranged along one side of the upper ring seat. The filter mesh bag is sleeved outside the U-shaped rods, and the opening of the filter mesh bag is fixed on the upper ring seat.

[0010] Furthermore, the filter bag skeleton includes an upper ring seat and a lower ring seat, the upper ring seat and the lower ring seat are connected by a plurality of groups of vertical rods, the filter mesh bag is sleeved outside the plurality of groups of vertical rods, and the opening of the filter mesh bag is fixed on the upper ring seat.

[0011] Furthermore, the tube body is coaxially arranged with the filter channel, and the axes of the tube body and the filter channel are inclined with respect to a horizontal plane, wherein the height of the tube body inlet end from the ground is greater than the height of the tube body outlet end from the ground.

[0012] Furthermore, the water inlet is arranged at the lower end of the tube body and is disposed on a side close to the inlet end of the tube body, and the water outlet is arranged at the upper end of the tube body and is disposed on a side close to the outlet end of the tube body.

[0013] Furthermore, a valve and a pressure gauge are provided on the first pipeline.

[0014] Furthermore, a water inlet valve is provided on the water inlet, and a water outlet valve is provided on the water outlet.

[0015] Furthermore, the second pipeline is a steel wire hose.

[0016] Furthermore, the length of the tube body is shorter than the length of the filter bag.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the utility model provides a screw extruder vacuum filter device, which solves the technical problem by introducing a uniquely designed tube structure. The tube structure not only includes a filter channel with a filter bag to effectively intercept and filter out volatile substances and impurities such as water vapor generated at high temperature, but also has a chilled water channel designed on its circumference. The chilled water channel can be injected with chilled water through the water inlet to cool the filter channel to improve the interception efficiency of volatile substances at high temperature. The volatile substances at high temperature are sucked into the filter channel under the action of vacuum. Due to the action of the chilled water, the volatile substances are directly solidified by cold in the filter channel, and are thus intercepted by the filter bag. When cleaning, it is only necessary to remove the filter bag in this section of the tube body, clean it, and then reinstall it. In addition, the inlet and outlet ends of the tube body are connected to the pipes of the extruder and the vacuum pump water tank through a detachable structure, so that the entire vacuum filter device can be easily disassembled and reassembled, which not only ensures the effective connection of the device, but also greatly facilitates cleaning and maintenance work. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of a screw extruder vacuum filtration device disclosed in this application.

[0020] Figure 2 These are a stereoscopic view and three-view drawing of a filter bag skeleton disclosed in this application.

[0021] The reference numerals shown in the figure are: 1. tube body; 2. first detachable structure; 3. first pipeline; 4. second detachable structure; 5. second pipeline; 6. filter channel; 7. chilled water channel; 8. water inlet; 9. water outlet; 10. filter mesh bag; 11. filter bag frame; 12. valve; 13. pressure gauge; 14. water inlet valve; 15. water outlet valve; 110. upper ring seat; 111. U-shaped rod. DETAILED DESCRIPTION

[0022] The present invention will be described in detail below in conjunction with the accompanying drawings, and the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0025] See also Figure 1 The figure is a schematic diagram of the structure of a screw extruder vacuum filtration device provided in a preferred embodiment of the present application. Figure 1 In the embodiment shown, the device includes a specially designed tube body 1, the inlet end of which is connected to the first pipe 3 of the extruder through the first detachable structure 2, and the outlet end is connected to the second pipe 5 of the vacuum pump water tank through the second detachable structure 4. The tube body 1 is divided into two parts: a filter channel 6 and a chilled water channel 7, wherein the chilled water channel 7 is located on the peripheral side of the filter channel 6 and is not connected to the filter channel 6, and the filter channel 6 is connected to the first pipe 3 and the second pipe 5. A filter mesh bag 10 is provided in the filter channel 6, and the opening of the filter mesh bag 10 faces the first pipe 3, which is used to capture and filter volatile substances and impurities such as water vapor. The cooling of the filter channel 6 is the responsibility of the chilled water channel 7. By injecting chilled water into the water inlet 8, the chilled water enters the chilled water channel 7, and the flowing chilled water transfers the low temperature to the filter channel 6 in the chilled water channel 7 to reduce the temperature of the filter channel 6, so that the volatile substances are directly solidified by cold in the filter channel 6, and are thus intercepted by the filter mesh bag 10.

[0026] During the processing of the screw extruder, after the complex is heated and melted, a certain amount of volatile substances and water vapor will be generated. These substances flow into the filter channel 6 with the material. In the filter channel 6, the chilled water injected into the chilled water channel 7 cools the filter channel 6, so that the volatile substances are directly solidified by cold in the filter channel 6, and are then intercepted by the filter bag 10. In this way, the device effectively prevents the blockage of the vacuum pipeline, ensures the normal operation of the extruder and the quality of the plastic product. When cleaning or maintenance is required, due to the detachable structure, the entire vacuum filtration device can be easily disassembled, and the cleaning work can be completed conveniently and quickly.

[0027] In some embodiments, the inlet end of the tube body 1 is connected to the first pipe 3 by threads or flanges. When it is a threaded connection, the first detachable structure 4 is an internal thread or external thread connection structure, and the second detachable structure 4 is the same as the first detachable structure 2.

[0028] In this embodiment, a structure for supporting the filter bag 10 is installed inside the filter bag 10. The supporting structure is a filter bag frame 11, which is intended to maintain the shape of the filter bag 10 and prevent it from deforming or collapsing during the filtration process, thereby ensuring the filtration effect.

[0029] like Figure 2 As shown, in the first embodiment of the filter bag frame 11, the filter bag frame 11 is composed of an upper ring seat 110 and a plurality of U-shaped rods 111. The U-shaped rods 111 are arranged crosswise to form a columnar structure. The filter mesh bag 10 is covered on the outside of the U-shaped rods 111, and the opening part of the filter mesh bag 10 is fixed on the upper ring seat 110.

[0030] Different from the first embodiment of the filter bag frame 11, in the second embodiment of the filter bag frame 11, the filter bag frame 11 comprises an upper ring seat and a lower ring seat (not shown), which are connected by a plurality of vertical rods. The filter mesh bag 10 is sleeved outside these vertical rods, and its opening is also fixed on the upper ring seat.

[0031] In this embodiment, the tube body 1 and the filter channel 6 are coaxially arranged, and their axes are inclined at a certain angle to the horizontal plane, wherein the height of the inlet end of the tube body 1 from the ground is greater than the height of the outlet end of the tube body 1 from the ground. The purpose of this inclined design is to prevent the generated condensed water from flowing back into the extruder, causing the material to hydrolyze and affecting the product quality.

[0032] In this embodiment, the water inlet 8 is arranged at the lower end of the tube body 1, and close to the inlet end of the tube body 1, while the water outlet 9 is arranged at the upper end of the tube body 1, and close to the outlet end of the tube body 1. This design reasonably guides the direction of water flow, ensuring that the water flowing in from the water inlet 8 can be filtered and then flow out from the water outlet 9, so that the circulation mode of the chilled water is bottom-in and top-out, so as to improve the cooling efficiency.

[0033] In this embodiment, a valve 12 and a pressure gauge 13 are provided on the first pipeline 3 to control the on / off of the water flow and monitor the pressure change during the filtration process, so as to ensure the normal operation of the filtration system and timely adjust the filtration conditions.

[0034] In this embodiment, a water inlet valve 15 is provided on the water inlet 8, and a water outlet valve 15 is provided on the water outlet 9, so that the water flow can be better controlled, the water source can be quickly cut off when necessary, and the safety of the system can be improved.

[0035] A steel wire hose is selected as the second pipe 5. The pipe made of this material has good flexibility and pressure resistance and is suitable for complex or changing installation environments.

[0036] Preferably, the filter bag 10 is composed of a filter cloth or other filter mesh having a filtering function. For example, the filter bag 10 should be made of an acid-resistant, alkali-resistant, organic solvent-resistant, heat-resistant, washable and reusable material or a disposable heat-resistant material.

[0037] Preferably, the filter bag frame 11 is embedded in the filter channel 6 of the tube body 1 .

[0038] Preferably, the length of the tube body 1 should be shorter than the length of the filter bag 10 placed in the tube body 1 to prevent volatile substances from accumulating behind the filter and making it difficult to clean.

[0039] Therefore, no matter from which point of view, the embodiments should be regarded as illustrative and non-restrictive, and the scope of the present application is limited by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present application. Any figure mark in the claims should not be regarded as limiting the claims involved. In addition, it is obvious that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple units or devices stated in the device claim can also be implemented by the same unit or device through software or hardware. The words first, second, etc. are used to indicate names, and do not indicate any particular order.

[0040] The above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the preferred embodiments, a person skilled in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A screw extruder vacuum filtration device, characterized in that: It includes a tube body, the inlet end of the tube body is connected to the first pipe of the extruder through a first detachable structure, and the outlet end of the tube body is connected to the second pipe of the vacuum pump water tank through a second detachable structure, wherein the tube body has a filter channel and a chilled water channel, the chilled water channel is located on the periphery of the filter channel, and the tube body is provided with a water inlet and a water outlet connected to the chilled water channel, so as to inject chilled water into the chilled water channel through the water inlet to cool the filter channel; the filter channel is connected to the first pipe and the second pipe, and a filter mesh bag is provided in the filter channel, and the opening of the filter mesh bag faces the first pipe.

2. A screw extruder vacuum filtration device according to claim 1, characterized in that: A filter bag frame is arranged inside the filter mesh bag.

3. A screw extruder vacuum filtration device according to claim 2, characterized in that: The filter bag frame comprises an upper ring seat, a plurality of cross-arranged U-shaped rods are arranged along one side of the upper ring seat, the filter mesh bag is sleeved outside the U-shaped rods, and the opening of the filter mesh bag is fixed on the upper ring seat.

4. A screw extruder vacuum filtration device according to claim 2, characterized in that: The filter bag skeleton comprises an upper ring seat and a lower ring seat, wherein the upper ring seat and the lower ring seat are connected via a plurality of groups of vertical rods, the filter mesh bag is sleeved outside the plurality of groups of vertical rods, and the opening of the filter mesh bag is fixed on the upper ring seat.

5. A screw extruder vacuum filtration device according to claim 1, characterized in that: The tube body is coaxially arranged with the filter channel, and the axes of the tube body and the filter channel are inclined with respect to a horizontal plane, wherein the height of the tube body inlet end from the ground is greater than the height of the tube body outlet end from the ground.

6. A screw extruder vacuum filtration device according to claim 1, characterized in that: The water inlet is arranged at the lower end of the tube body and is disposed close to the inlet end of the tube body, and the water outlet is arranged at the upper end of the tube body and is disposed close to the outlet end of the tube body.

7. A screw extruder vacuum filtration device according to claim 1, characterized in that: The first pipeline is provided with a valve and a pressure gauge.

8. A screw extruder vacuum filtration device according to claim 1, characterized in that: The water inlet is provided with a water inlet valve, and the water outlet is provided with a water outlet valve.

9. A screw extruder vacuum filtration device according to claim 1, characterized in that: The second pipeline is a steel wire hose.

10. A screw extruder vacuum filtration device according to claim 1, characterized in that: The length of the tube body is shorter than the length of the filter bag.

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