Polyethylene wax cracking molding device and molding method thereof

Abstract

The invention discloses a polyethylene wax cracking and forming device and a forming method thereof.The polyethylene wax cracking and forming device comprises a pyrolysis bin, a heating mechanism used for heating and pyrolysis is arranged in the pyrolysis bin, the heating mechanism comprises a protective shell, an interlayer, a first electric heating wire, a transmission rod, a functional bin, a second electric heating wire and a stirring rod, and the protective shell is fixedly arranged on the outer side of the pyrolysis bin; an interlayer is arranged between the protective shell and the pyrolysis bin, a first electric heating wire is arranged in the interlayer, a transmission rod is movably arranged in the middle of the inner side of the pyrolysis bin through a bearing, a functional bin is fixedly arranged on the surface of the lower end of the transmission rod, and a second electric heating wire is fixedly arranged in the functional bin. The polyethylene wax thermal cracking device is good in using effect, heating can be conducted from the inside and the outside of the device at the same time when polyethylene wax thermal cracking is conducted, heating is more uniform, the heating effect is better, and therefore catalytic thermal cracking work can be conveniently conducted.

Description

Technical Field

[0001] The invention relates to the technical field of polyethylene wax processing, in particular to a polyethylene wax cracking and molding device and a molding method thereof. Background Art

[0002] Polyethylene wax, also known as polymer wax or polyethylene wax for short, is widely used due to its excellent cold resistance, heat resistance, chemical resistance and wear resistance. In normal production, this part of wax can be directly added to polyolefin processing as an additive, which can increase the gloss and processing performance of the product. As a lubricant, it has stable chemical properties and good electrical properties.

[0003] In the prior art, when polyethylene wax is cracked and formed, the following steps are often used to clean and dry the raw materials to ensure the purity and consistency of the raw materials during the cracking process, and then the cracking reaction is carried out: under high temperature conditions (usually above 290°C), the polyethylene raw material undergoes a cracking reaction, the molecular weight decreases rapidly, and a low molecular weight polyethylene wax is generated. A catalyst may need to be added in the process to improve the cracking efficiency. The cracking reaction can be carried out under pressurized or normal pressure conditions, depending on the production process and equipment, and the products are finally collected and processed: the gas and liquid products produced by the cracking are collected separately. The liquid product contains polyethylene wax, which needs to be further processed such as distillation and separation to obtain a pure polyethylene wax product.

[0004] However, in the prior art, the following problems exist in the cracking of polyethylene wax: when performing thermal cracking of polyethylene wax, the temperature requirement is 290°C, so it is not suitable for water bath heating and generally requires electric heating. The heating wire of the electric heating pyrolysis furnace in the prior art is generally arranged on the periphery of the furnace, which leads to uneven heating temperature inside and outside the pyrolysis furnace, and slow melting and pyrolysis of internal particles. At the same time, such pyrolysis furnaces in the prior art need to be filtered after pyrolysis, and when the filter element of the filtering device is clogged, the filtering efficiency of the entire device is often affected during the process of removing the old filter element and replacing it with a new one. Therefore, in view of the above problems, it is necessary to improve a polyethylene wax cracking molding device and a molding method thereof. Summary of the invention

[0005] The object of the present invention is to provide a polyethylene wax cracking and molding device and a molding method thereof to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a polyethylene wax cracking and molding device, comprising a pyrolysis chamber, a heating mechanism for heating and pyrolysis is arranged inside the pyrolysis chamber, the heating mechanism comprises a protective shell, an interlayer, a first heating wire, a transmission rod, a functional chamber, a second heating wire, and a stirring rod, a protective shell is fixedly arranged on the outside of the pyrolysis chamber, an interlayer is arranged between the protective shell and the pyrolysis chamber, a first heating wire is arranged inside the interlayer, a transmission rod is movably arranged on the middle part of the inner side of the pyrolysis chamber through a bearing, a functional chamber is fixedly arranged on the lower end surface of the transmission rod, a second heating wire is fixedly arranged inside the functional chamber, a plurality of stirring rods are evenly fixedly arranged on the outer surface of the functional chamber, a rotating power supply mechanism for supplying power to the second heating wire is arranged at the upper end of the pyrolysis chamber, and a filtering mechanism for filtering polyethylene wax is arranged at the lower end of the pyrolysis chamber.

[0007] Preferably, the rotating power supply mechanism includes a copper column, a wire, a conductive block, and a conductive ring. The interior of the transmission rod is hollow, and a copper column is fixedly arranged in the middle of the inner side of the transmission rod. A wire is fixedly arranged on the upper end of the second heating wire, and the wire passes through the outer side of the transmission rod and extends to the inside of the transmission rod, and is electrically connected to the copper column. A conductive block is fixedly arranged on the upper end of the copper column, and a conductive ring is arranged on the outer side of the conductive block at the upper end of the pyrolysis chamber. Since the second heating wire of the device will continuously rotate due to stirring needs during operation, in order to prevent the power supply cable from being entangled, rotating power supply is required. Through the rotating power supply mechanism of the device, only the outside needs to power the conductive ring, and then the current can power the second heating wire through the conductive balls, conductive blocks, copper columns, and wires.

[0008] Preferably, a conductive ball is provided on one side of the conductive block close to the conductive ring through a slot for movable engagement. The conductive block contacts the inner side wall of the conductive ring through the conductive ball. The conductive ball replaces the conductive block in contact with the conductive ring, which can ensure rotational power supply while avoiding unnecessary friction loss.

[0009] Preferably, the filtering mechanism includes a rotating shaft, a fixing frame, and a filter element. The rotating shaft is fixedly provided in the middle part of the lower end of the pyrolysis chamber, and the fixing frame is fixedly provided at the lower end of the rotating shaft. Filter elements are movably engaged on both sides of the surface of the fixing frame. The catalytically processed polyethylene wax can be discharged from the discharge pipe and then filtered by the filter element. Finally, the polyethylene wax filtered by the filter element can flow into the next workstation for processing. As the filter element is filtered, it will gradually become clogged. When the filter element needs to be replaced, first temporarily close the control valve, then rotate the rotating shaft to swap the left and right filter elements, and then open the control valve again. At this time, there is sufficient time to clean the clogged filter element without affecting the filtering efficiency of the device. When the filter element needs to be replaced, the filter element can be quickly pulled out of the fixing frame to facilitate the replacement of the new filter element.

[0010] Preferably, a liquid inlet pipe is fixedly provided on one side of the upper end of the pyrolysis chamber, and the raw materials to be pyrolyzed and the corresponding catalyst can be conveniently injected into the pyrolysis chamber through the liquid inlet pipe.

[0011] Preferably, a connecting flange is fixedly provided at one end of the liquid inlet pipe, and the liquid inlet pipe can be conveniently connected to other pipelines through the connecting flange.

[0012] Preferably, a liquid outlet pipe is fixedly provided at the lower end of the pyrolysis chamber, and a control valve is fixedly provided in the middle of the liquid outlet pipe, and the polyethylene wax catalyzed by pyrolysis can be discharged through the liquid outlet pipe.

[0013] Preferably, a side wall of the inner layer of the interlayer away from the pyrolysis chamber is provided with a heat-insulating layer, which can prevent heat from dissipating to the outside of the interlayer, thereby ensuring that heat is transferred to the inner layer of the pyrolysis chamber.

[0014] Preferably, a worm gear reducer is provided at the upper end of the pyrolysis chamber, and an electric motor is provided on one side of the worm gear reducer. The power output shaft end of the worm gear reducer is transmission-connected to the transmission rod, and the power output end of the motor is transmission-connected to the power input end of the worm gear reducer. The worm gear reducer can be driven to rotate by the electric motor, thereby driving the transmission rod to rotate.

[0015] A polyethylene wax cracking and molding method; comprising the following steps: The first step is raw material injection processing: when using the device, the raw materials to be pyrolyzed and the corresponding catalyst can be conveniently injected into the pyrolysis chamber through the liquid inlet pipe, and then the device performs heating and cracking work. During heating, both the first heating wire and the second heating wire of the device can perform heating work, so that heating can be performed from the inside and outside of the device at the same time, so that the heating is more uniform and the heating effect is better, so that the catalytic pyrolysis work can be conveniently performed; Step 2: Processing power supply: The second heating wire of the device will rotate continuously due to the need for stirring during operation. In order to prevent the power supply cable from being entangled, it is necessary to perform rotational power supply. Through the rotational power supply mechanism of the device, only the conductive ring needs to be powered by the outside world, and then the current can be supplied to the second heating wire through the conductive balls, conductive blocks, copper columns, and wires; and at this time, the conductive balls are used instead of the conductive blocks to contact the conductive ring, which can ensure rotational power supply while avoiding unnecessary friction loss; The third step is material discharge and filtration: the polyethylene wax that has been pyrolyzed, melted and catalyzed inside the pyrolysis chamber can then be discharged from the drain pipe and filtered by the filter element. Finally, the polyethylene wax filtered by the filter element can flow into the next station for processing. As the filter element is filtered, it will gradually become clogged. When the filter element needs to be replaced, first temporarily close the control valve, then rotate the shaft to swap the left and right filter elements, and then open the control valve again. At this time, there is sufficient time to clean the clogged filter element without affecting the filtration efficiency of the device. When the filter element needs to be replaced, the filter element can be quickly pulled out from the fixing frame to facilitate the replacement of the new filter element.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. When heating, the first and second heating wires of the device can both perform heating work, so that heating can be performed from both inside and outside of the device at the same time, which makes the heating more uniform and has a better heating effect, thereby facilitating catalytic thermal cracking work.

[0017] 2. The rotating power supply mechanism of the present invention only needs to supply power to the conductive ring from the outside, and then the current can supply power to the second heating wire through the conductive balls, conductive blocks, copper columns, and wires; and at this time, the conductive balls replace the conductive blocks to contact the conductive ring, which can ensure the rotating power supply while avoiding unnecessary friction losses.

[0018] 3. When the filter element needs to be replaced, the control valve is temporarily closed first, and then the rotating shaft is rotated to swap the left and right filter elements, and then the control valve is opened again. At this time, there is sufficient time to clean the clogged filter element without affecting the filtering efficiency of the device. When the filter element needs to be replaced, the filter element can be quickly pulled out of the fixing frame to facilitate replacement of the new filter element. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of a polyethylene wax cracking and molding device of the present invention; Figure 2 A top view of a polyethylene wax cracking and molding device according to the present invention; Figure 3 A cross-sectional view of a polyethylene wax cracking and molding device according to the present invention Figure 1 ; Figure 4 A cross-sectional view of a polyethylene wax cracking and molding device according to the present invention Figure 2 ; Figure 5 The invention provides a polyethylene wax cracking and molding device and a molding method thereof. Figure 2 Magnified view at A in the middle; Figure 6 The invention provides a polyethylene wax cracking and molding device and a molding method thereof. Figure 4Magnified view at B.

[0020] In the figure: 1. pyrolysis chamber; 2. protective shell; 3. interlayer; 4. first heating wire; 5. transmission rod; 6. functional chamber; 7. second heating wire; 8. stirring rod; 9. copper column; 10. wire; 11. conductive block; 12. conductive ring; 13. conductive ball; 14. rotating shaft; 15. fixing frame; 16. filter element; 17. liquid inlet pipe; 18. connecting flange; 19. liquid outlet pipe; 20. control valve; 21. worm gear reducer; 22. electric motor. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0022] See also Figure 1-6 The present invention provides a technical solution: a polyethylene wax cracking molding device and a molding method thereof, comprising a pyrolysis chamber 1, wherein a heating mechanism for heating and pyrolysis is arranged inside the pyrolysis chamber 1, wherein the heating mechanism comprises a protective shell 2, an interlayer 3, a first electric heating wire 4, a transmission rod 5, a functional chamber 6, a second electric heating wire 7, and a stirring rod 8, wherein the protective shell 2 is fixedly arranged on the outer side of the pyrolysis chamber 1, an interlayer 3 is arranged between the protective shell 2 and the pyrolysis chamber 1, and the first electric heating wire 4 is arranged inside the interlayer 3, a transmission rod 5 is movably arranged at the middle part of the inner side of the pyrolysis chamber 1 through a bearing, a functional chamber 6 is fixedly arranged on the lower end surface of the transmission rod 5, a second electric heating wire 7 is fixedly arranged inside the functional chamber 6, and a plurality of stirring rods 8 are evenly fixedly arranged on the outer surface of the functional chamber 6, a rotating power supply mechanism for supplying power to the second electric heating wire 7 is arranged at the upper end of the pyrolysis chamber 1, and a filtering mechanism for filtering polyethylene wax is arranged at the lower end of the pyrolysis chamber 1.

[0023] The rotating power supply mechanism includes a copper column 9, a wire 10, a conductive block 11, and a conductive ring 12. The interior of the transmission rod 5 is hollow, and the copper column 9 is fixedly arranged in the middle of the inner side of the transmission rod 5. The upper end of the second electric heating wire 7 is fixedly arranged with a wire 10, and the wire 10 passes through the outer side of the transmission rod 5 and extends to the inside of the transmission rod 5, and is electrically connected to the copper column 9. The upper end of the copper column 9 is fixedly arranged with a conductive block 11, and the upper end of the pyrolysis chamber 1 is provided with a conductive ring 12 outside the conductive block 11. Since the second electric heating wire 7 of the device will continuously rotate due to stirring during operation, in order to prevent the power supply cable from being entangled, it is necessary to perform rotating power supply. Through the rotating power supply mechanism of the device, only the conductive ring 12 needs to be powered by the outside, and then the current can be supplied to the second electric heating wire 7 through the conductive ball 13, the conductive block 11, the copper column 9, and the wire 10; A conductive ball 13 is movably engaged with a groove on one side of the conductive block 11 close to the conductive ring 12. The conductive block 11 contacts the inner side wall of the conductive ring 12 through the conductive ball 13. The conductive ball 13 replaces the conductive block 11 in contact with the conductive ring 12, which can ensure rotation power supply while avoiding unnecessary friction loss. The filtering mechanism includes a rotating shaft 14, a fixing frame 15, and a filter element 16. The rotating shaft 14 is fixedly provided at the middle part of the lower end of the pyrolysis chamber 1, and the fixing frame 15 is fixedly provided at the lower end of the rotating shaft 14. The filter elements 16 are movably engaged on both sides of the surface of the fixing frame 15. The catalytically processed polyethylene wax can be discharged from the discharge pipe and then filtered by the filter element 16. Finally, the polyethylene wax filtered by the filter element 16 can flow into the next station for processing. As the filter element 16 is filtered, it will gradually become clogged. When the filter element 16 needs to be replaced, the control valve 20 is temporarily closed first, and then the rotating shaft 14 is rotated to swap the left and right filter elements 16. Then, the control valve 20 is opened again. At this time, there is sufficient time to clean the clogged filter element 16, and the filtering efficiency of the device will not be affected. When the filter element 16 needs to be replaced, the filter element 16 can be quickly pulled out from the fixing frame 15 to facilitate the replacement of the new filter element 16. A liquid inlet pipe 17 is fixedly provided on one side of the upper end of the pyrolysis chamber 1, and the raw materials to be pyrolyzed and the corresponding catalyst can be conveniently injected into the pyrolysis chamber 1 through the liquid inlet pipe 17; A connecting flange 18 is fixedly provided at one end of the liquid inlet pipe 17, and the liquid inlet pipe 17 can be conveniently connected to other pipelines through the connecting flange 18; The lower end of the pyrolysis chamber 1 is fixedly provided with a liquid outlet pipe 19, and the middle of the liquid outlet pipe 19 is fixedly provided with a control valve 20, through which the polyethylene wax after pyrolysis catalysis can be discharged; A heat-insulating layer is provided on the side wall of the inner layer 3 away from the pyrolysis chamber 1, and the heat-insulating layer can prevent the heat from dissipating to the outer side of the interlayer 3, thereby ensuring that the heat is transferred to the inner part of the pyrolysis chamber 1; A worm gear reducer 21 is arranged at the upper end of the pyrolysis chamber 1, and a motor 22 is arranged on one side of the worm gear reducer 21. The power output shaft end of the worm gear reducer 21 is transmission-connected to the transmission rod 5, and the power output end of the motor 22 is transmission-connected to the power input end of the worm gear reducer 21. The motor 22 can drive the worm gear reducer 21 to rotate, thereby driving the transmission rod 5 to rotate.

[0024] A polyethylene wax cracking and molding method; comprising the following steps: Step 1: Raw material injection processing: When using the device, the raw material to be pyrolyzed and the corresponding catalyst can be conveniently injected into the pyrolysis chamber 1 through the liquid inlet pipe 17, and then the device performs heating and cracking work. During heating, the first heating wire 4 and the second heating wire 7 of the device can both perform heating work, so that heating can be performed from the inside and outside of the device at the same time, so that the heating is more uniform and the heating effect is better, so that the catalytic thermal cracking work can be conveniently performed; Step 2: Processing power supply: The second heating wire 7 of the device will rotate continuously due to the need for stirring during operation. In order to prevent the power supply cable from being entangled, it is necessary to perform rotational power supply. Through the rotational power supply mechanism of the device, only the conductive ring 12 needs to be powered by the outside world, and then the current can be supplied to the second heating wire 7 through the conductive ball 13, the conductive block 11, the copper column 9, and the wire 10; and at this time, the conductive ball 13 replaces the conductive block 11 to contact the conductive ring 12, which can ensure rotational power supply while avoiding unnecessary friction loss; The third step is material discharge and filtration: the polyethylene wax that is pyrolyzed, melted and catalyzed inside the pyrolysis chamber 1 can then be discharged from the drain pipe and then filtered by the filter element 16. Finally, the polyethylene wax filtered by the filter element 16 can flow into the next station for processing. As the filter element 16 is filtered, it will gradually become clogged. When the filter element 16 needs to be replaced, first temporarily close the control valve 20, then rotate the shaft 14 to swap the left and right filter elements 16, and then open the control valve 20. At this time, there is sufficient time to clean the clogged filter element 16 without affecting the filtration efficiency of the device. When the filter element 16 needs to be replaced, the filter element 16 can be quickly pulled out from the fixing frame 15 to facilitate the replacement of the new filter element 16.

[0025] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A polyethylene wax cracking and molding device, comprising a pyrolysis chamber (1), characterized in that: A heating mechanism for heating and pyrolysis is arranged inside the pyrolysis chamber (1), and the heating mechanism comprises a protective shell (2), an interlayer (3), a first electric heating wire (4), a transmission rod (5), a functional chamber (6), a second electric heating wire (7), and a stirring rod (8). The protective shell (2) is fixedly arranged outside the pyrolysis chamber (1), an interlayer (3) is arranged between the protective shell (2) and the pyrolysis chamber (1), and the first electric heating wire (4) is arranged inside the interlayer (3). A transmission rod (5) is movably arranged in the middle part of the inner side of the pyrolysis chamber (1) via a bearing, and a functional chamber (6) is fixedly arranged on the lower end surface of the transmission rod (5), and a second electric heating wire (7) is fixedly arranged inside the functional chamber (6). A plurality of stirring rods (8) are evenly fixedly arranged on the outer surface of the functional chamber (6). A rotating power supply mechanism for supplying power to the second electric heating wire (7) is arranged at the upper end of the pyrolysis chamber (1), and a filtering mechanism for filtering polyethylene wax is arranged at the lower end of the pyrolysis chamber (1).

2. A polyethylene wax cracking and molding device according to claim 1, characterized in that: The rotating power supply mechanism comprises a copper column (9), a wire (10), a conductive block (11), and a conductive ring (12); the interior of the transmission rod (5) is hollow; the copper column (9) is fixedly arranged in the middle of the inner side of the transmission rod (5); the upper end of the second electric heating wire (7) is fixedly arranged with a wire (10); the wire (10) passes through the outer side of the transmission rod (5) and extends to the inside of the transmission rod (5), and is electrically connected to the copper column (9); the upper end of the copper column (9) is fixedly arranged with a conductive block (11); and the upper end of the pyrolysis chamber (1) is provided with a conductive ring (12) outside the conductive block (11).

3. A polyethylene wax cracking and molding device according to claim 2, characterized in that: A conductive ball (13) is movably engaged with a slot on one side of the conductive block (11) close to the conductive ring (12), and the conductive block (11) is in contact with the inner side wall of the conductive ring (12) via the conductive ball (13).

4. A polyethylene wax cracking and molding device according to claim 1, characterized in that: The filtering mechanism comprises a rotating shaft (14), a fixing frame (15), and a filter element (16); the rotating shaft (14) is fixedly arranged at the middle of the lower end of the pyrolysis chamber (1); the fixing frame (15) is fixedly arranged at the lower end of the rotating shaft (14); and the filter element (16) is movably engaged with both sides of the surface of the fixing frame (15).

5. A polyethylene wax cracking and molding device according to claim 1, characterized in that: A liquid inlet pipe (17) is fixedly arranged on one side of the upper end of the pyrolysis chamber (1).

6. A polyethylene wax cracking and molding device according to claim 5, characterized in that: A connecting flange (18) is fixedly provided at one end of the liquid inlet pipe (17).

7. A polyethylene wax cracking and molding device according to claim 1, characterized in that: A liquid outlet pipe (19) is fixedly provided at the lower end of the pyrolysis chamber (1), and a control valve (20) is fixedly provided in the middle of the liquid outlet pipe (19).

8. A polyethylene wax cracking and molding device according to claim 1, characterized in that: A heat-insulating layer is provided on a side wall of the inner part of the interlayer (3) which is away from the pyrolysis chamber (1).

9. A polyethylene wax cracking and molding device according to claim 1, characterized in that: A worm gear reducer (21) is disposed at the upper end of the pyrolysis chamber (1), and an electric motor (22) is disposed on one side of the worm gear reducer (21); a power output shaft end of the worm gear reducer (21) is transmission-connected to a transmission rod (5), and a power output end of the electric motor (22) is transmission-connected to a power input end of the worm gear reducer (21).

10. A polyethylene wax cracking and molding method according to claims 1-9, characterized in that: The following steps are involved: Step 1: Raw material injection processing: When using the device, the raw material to be pyrolyzed and the corresponding catalyst can be conveniently injected into the pyrolysis chamber (1) through the liquid inlet pipe (17), and then the device performs heating and cracking work. During heating, the first electric heating wire (4) and the second electric heating wire (7) of the device can both perform heating work, so that heating can be performed from both inside and outside of the device at the same time, so that the heating is more uniform and the heating effect is better, thereby facilitating the catalytic pyrolysis work; Step 2: Processing power supply: The second heating wire (7) of the device will rotate continuously due to the need for stirring during operation. In order to prevent the power supply cable from being entangled, it is necessary to perform rotational power supply. Through the rotational power supply mechanism of the device, only the outside world needs to supply power to the conductive ring (12), and then the current can be supplied to the second heating wire (7) through the conductive ball (13), the conductive block (11), the copper column (9), and the wire (10); and at this time, the conductive ball (13) replaces the conductive block (11) to contact the conductive ring (12), which can ensure rotational power supply while avoiding unnecessary friction loss; Step 3: Material discharge and filtration: The polyethylene wax that has been pyrolyzed and melted and catalyzed in the pyrolysis chamber (1) can then be discharged from the drain pipe and filtered by the filter element (16). Finally, the polyethylene wax filtered by the filter element (16) can flow into the next station for processing. As the filter element (16) is filtered, it will gradually become clogged. When the filter element (16) needs to be replaced, the control valve (20) is temporarily closed, and then the shaft (14) is rotated to swap the left and right filter elements (16). Then, the control valve (20) is opened again. At this time, there is sufficient time to clean the clogged filter element (16) without affecting the filtering efficiency of the device. When the filter element (16) needs to be replaced, the filter element (16) can be quickly pulled out from the fixing frame (15) to facilitate the replacement of the new filter element (16).

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