Dual-lip negative pressure sealing device

Abstract

The application discloses a double-lip negative pressure sealing device, and belongs to the technical field of mixers. The device comprises a top cover, a mixing barrel, a fixing assembly, a baffle ring, a sealing lip and a negative pressure dust extraction assembly. The mixing barrel is rotatably arranged below the top cover. The first fixing assembly ring of the fixing assembly is arranged below the top cover, and the second fixing assembly ring is arranged on the inner sidewall of the mixing barrel. The first baffle ring is arranged below the top cover, and the second baffle ring is arranged on the inner wall of the mixing barrel. The sealing lip comprises a first sealing lip arranged on the first fixing assembly and a second sealing lip arranged on the second fixing assembly. The first sealing lip is in sliding contact with the second baffle ring, and the second sealing lip is in sliding contact with the first baffle ring. The pulse back-blowing dust collector of the negative pressure dust extraction assembly extracts air in the sealing cavity, so that the sealing cavity is in negative pressure when the mixing barrel rotates. The device extracts air in the sealing cavity, so that the air pressure in the sealing cavity is less than the atmospheric pressure outside, and dust particles cannot spread to the high-pressure outside, thereby enhancing the sealing property of the device.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mixers, and particularly relates to a double-lip negative-pressure sealing device. BACKGROUND

[0002] In engineering machinery, most of the mixing devices adopt the form of forced mixing of a mixing barrel and a driving device, that is, the driving device of the mixing barrel and the stirring mechanism are installed at fixed positions, the stirring mechanism is driven to rotate in the mixing barrel by the driving device, and the mixing of the material in the mixing barrel is realized. At present, the mixing barrel of part of the mixing devices on the market can rotate while the top cover remains stationary, so that the driving device installed on the top cover and the mixing barrel can rotate relatively, and the stirring mechanism simultaneously rotates and revolves in the mixing barrel. However, the sealing structure of the top cover and the mixing barrel is single, the sealing device needs to slide by friction when the mixing barrel rotates, and due to the influence of sliding, the sealing device is difficult to completely contact the sealing part, and it is difficult to achieve complete sealing, resulting in poor sealing performance. When mixing materials with a lot of dust, the dust is easy to be scattered outside the device, which is not conducive to environmental protection. SUMMARY

[0003] In view of the deficiencies in the related art, the application provides a double-lip negative-pressure sealing device to solve the problem of poor sealing effect of the current mixing barrel that can rotate.

[0004] The application provides a double-lip negative-pressure sealing device, which comprises:

[0005] a top cover;

[0006] a mixing barrel rotatably arranged below the top cover;

[0007] a fixing assembly, the fixing assembly comprising a first fixing assembly and a second fixing assembly, the first fixing assembly being annularly arranged below the top cover and extending into the mixing barrel from a top end port of the mixing barrel, and the second fixing assembly being annularly arranged on an outer wall of the mixing barrel;

[0008] a retaining ring, the retaining ring comprising a first retaining ring and a second retaining ring, the first retaining ring being arranged below the top cover and on an outer side of the first fixing assembly, and the second retaining ring being arranged on an inner wall of the mixing barrel;

[0009] a sealing lip, the sealing lip comprising a first sealing lip arranged on the first fixing assembly and a second sealing lip arranged on the second fixing assembly, the first sealing lip being annularly arranged at a bottom portion of the first fixing assembly, and the second sealing lip being annularly arranged at a top portion of the second fixing assembly, the bottom end of the first sealing lip being in sliding contact with the second retaining ring at one side, and the top end of the second sealing lip being in sliding contact with the first retaining ring at one side;

[0010] The negative pressure dust extraction assembly is arranged on the top cover, and comprises a pulse back-blowing dust collector and a hose. The first sealing lip and the second sealing lip are arranged in a radial direction and are spaced apart to form a sealing cavity in the shape of a ring around the top cover, the mixing barrel, the first sealing lip and the second sealing lip. The pulse back-blowing dust collector extracts air in the sealing cavity through the hose, so that the sealing cavity is in a negative pressure state when the mixing barrel rotates.

[0011] The first sealing lip arranged on the first fixing assembly and the second sealing lip arranged on the second fixing assembly are respectively in sliding connection with the second blocking ring and the first blocking ring, and an annular sealing cavity is formed between the second sealing lip and the first sealing lip. The negative pressure dust extraction assembly extracts air in the sealing cavity, so that the air pressure in the sealing cavity is less than the atmospheric pressure. When the mixture is mixed, the mixing barrel and the top cover slide relative to each other. While the sealing lip provides sealing, the dust of the material cannot spread to the outside due to the negative pressure state of the sealing cavity, thereby enhancing the sealing performance of the device when the mixture is rotated.

[0012] In some embodiments, the inner side surface of the first blocking ring is inclined, the outer side surface of the second sealing lip is in sliding contact with the inner side surface of the first blocking ring, and the first blocking ring pushes the second sealing lip inward to incline the top of the second sealing lip inward.

[0013] In the technical solution, the second sealing lip is in sliding contact with the top cover through the first blocking ring. The first blocking ring provides a force point for the second sealing lip, facilitates the pressing of the second sealing lip, avoids direct friction between the second sealing lip and the top cover, reduces wear and tear, and prolongs the service life. Meanwhile, the first blocking ring pushes the second sealing lip to deform, which enables the second sealing lip to press the first blocking ring under the action of its own elasticity, thereby enhancing the sealing effect.

[0014] In some embodiments, the first sealing lip extends into the mixing barrel through a port at the top end of the mixing barrel and is in sliding contact with the second blocking ring.

[0015] In the technical solution, the sliding of the first sealing lip into the mixing barrel can resist the flying of the material and reduce the diffusion of the dust of the material.

[0016] In some embodiments, the inner side surface of the second blocking ring is inclined, and the outer side surface of the first sealing lip is in sliding contact with the inner side surface of the second blocking ring. The second blocking ring pushes the first sealing lip inward to incline the bottom of the first sealing lip inward.

[0017] In the technical solution, the second blocking ring provides a force point for the sliding contact of the first sealing lip, avoids direct sliding of the first sealing lip on the barrel wall of the mixing barrel, reduces wear and tear of the sealing lip, and prolongs the service life. Meanwhile, the second blocking ring pushes the first sealing lip to bend, which enables the first sealing lip to press the second blocking ring under the action of its own elasticity, thereby further enhancing the sealing effect.

[0018] In some embodiments, the first fixing assembly comprises a first clamping piece, the first clamping piece further comprises a first sealing support ring, a first sealing gasket and a first clamping strip, the first sealing support ring is connected with the lower surface of the top cover, further, the first sealing support ring and the first clamping strip clamp the first sealing gasket in the middle, the longitudinal length of the first sealing gasket is less than the first sealing support ring and the first clamping strip, the first sealing support ring, the first sealing gasket and the first clamping strip constitute a concave structure, the first sealing lip is arranged at the notch between the first sealing support ring and the first clamping strip and abuts against the first sealing gasket.

[0019] In the technical solution, the first clamping piece is connected with the top cover through the first sealing support ring, the first sealing support ring, the first sealing gasket and the first clamping strip constitute a concave structure, the notch of the concave structure has a positioning effect, and the first sealing lip can be installed by being inserted from the notch, which is fast and convenient.

[0020] In some embodiments, the first fixing assembly further comprises a first fixing bolt, the first fixing bolt is arranged through the first clamping piece to fix the first clamping strip and the first sealing gasket on the first sealing support ring, and the first fixing bolt holds and fixes the first sealing lip on the first sealing support ring through the first clamping strip.

[0021] In the technical solution, the first fixing bolt is arranged through the first clamping piece, the structure is stable, the first fixing bolt can provide strong holding force, the first clamping piece cannot be loosened, and when the first clamping piece is replaced, the first fixing bolt can be loosened to complete disassembly, and the first fixing bolt can be tightened to enhance the fastening of the first sealing lip, so that the stability of the connection of the first sealing lip in the notch is ensured.

[0022] In some embodiments, the second fixing assembly comprises:

[0023] The fixing seat is arranged on the outer wall surface of the mixing barrel.

[0024] The second clamping piece is arranged on the side, away from the outer wall surface of the mixing barrel, of the fixing seat, the second clamping piece further comprises a second sealing support ring, a second sealing gasket and a second clamping strip, the second sealing support ring and the second clamping strip clamp the second sealing gasket in the middle, the longitudinal length of the second sealing gasket is less than the second sealing support ring and the second clamping strip, the second sealing support ring, the second sealing gasket and the second clamping strip constitute a concave structure, the second sealing lip is arranged at the notch between the second sealing support ring and the second clamping strip and abuts against the second sealing gasket.

[0025] The second fixing assembly adopts modular installation, the second clamping piece is installed on the fixing seat in a three-piece design, the second sealing support ring, the second sealing gasket and the second clamping strip are stacked and assembled, and the second sealing support ring, the second sealing gasket and the second clamping strip form a concave structure, the notch has a positioning function, the second sealing lip is inserted into the notch to complete positioning and installation, and the second sealing lip is simple and convenient without another limiting component.

[0026] In some embodiments, the second fixing assembly further comprises a second fixing bolt, the second fixing bolt is connected with the fixing seat after penetrating the second clamping piece, so that the second clamping piece is fixed on the fixing seat, and the second fixing bolt fixes the second sealing lip on the second sealing support ring through the second clamping strip.

[0027] In the technical scheme, the second fixing bolt fixes the second clamping piece on the positioning seat, the structure is stable, the second fixing bolt can provide strong pressing force to the second clamping piece, the stability is enhanced, the second fixing bolt is connected, the installation and disassembly are convenient, and maintenance and replacement are facilitated, and the second fixing bolt is tightened to enhance the fastening of the second sealing lip, and the stability of the connection of the second sealing lip in the notch is ensured.

[0028] In some embodiments, two air suction nozzles are oppositely arranged on the top cover above the sealing cavity, and the air suction nozzles are connected with the sealing cavity through a hose.

[0029] In the technical scheme, the hose is connected through the air suction nozzle, the hose is quickly installed and disassembled, maintenance and replacement are facilitated, two air suction nozzles are oppositely arranged, the air suction speed in the sealing cavity and the material is improved, and the working efficiency of the negative pressure dust suction assembly is improved.

[0030] In some embodiments, the pulse back-blowing dust collector is provided with a dust discharge port, the dust discharge port penetrates the top cover and is communicated with the internal space of the mixing barrel, and a valve is arranged on the dust discharge port.

[0031] In the technical scheme, the pulse back-blowing dust collector re-discharges the material dust sucked from the sealing cavity into the mixing barrel for mixing, reduces material waste, avoids corrosion of the sealing lip and other components caused by long residence time of the material in the sealing cavity, and the valve arranged on the dust discharge port can intermittently discharge the material in the pulse back-blowing dust collector into the mixing barrel to ensure the consistency of each batch of mixed material.

[0032] According to the technical scheme, the second fixed component on the mixing barrel is connected with the first blocking ring on the top cover through the second sealing lip, the first fixed component on the top cover is connected with the second blocking ring in the mixing barrel through the first sealing lip, and an annular sealing cavity is formed between the second sealing lip and the first sealing lip. The pulse back-blowing dust collector in the negative pressure dust extraction assembly extracts the air and material dust in the sealing cavity through the hose, so that the air pressure in the sealing cavity is less than the atmospheric pressure, and the material dust is prevented from corroding the sealing lip and other components. When the mixing barrel and the top cover rotate relative to each other, the double-layer sealing lips provide sealing, and the material dust cannot spread to the outside due to the negative pressure in the sealing cavity, so that the sealing of the device is enhanced when the material is mixed. The device has simple structure, is convenient to disassemble, and is convenient to use and maintain. BRIEF DESCRIPTION OF DRAWINGS

[0033] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and serve to explain the principles of the application. The drawings illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0034] Figure 1 is a schematic diagram of the overall structure of an embodiment of the double-lip negative pressure sealing device.

[0035] Figure 2 is a first fixed component partial enlarged view of an embodiment of the double-lip negative pressure sealing device.

[0036] Figure 3 is a second fixed component partial enlarged view of an embodiment of the double-lip negative pressure sealing device.

[0037] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and serve to explain the principles of the application. The drawings illustrate embodiments of the application and, together with the description, serve to explain the principles of the application. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0039] In the description of this invention, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0040] The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] like Figures 1-3 As shown in the schematic embodiment of the double-lip negative pressure sealing device of the present invention, the double-lip negative pressure sealing device includes a top cover 1, a mixing tank 2, a fixing component 3, a retaining ring 4, a sealing lip 5, and a negative pressure dust extraction component 6.

[0043] Top cover 1;

[0044] Mixing tank 2 is rotatably positioned below top cover 1;

[0045] The fixing component 3 includes a first fixing component 301 and a second fixing component 302. The first fixing component 301 is arranged around the bottom of the top cover 1 and extends into the mixing tank 2 from the top port of the mixing tank 2. The second fixing component 302 is arranged around the outer wall of the mixing tank 2.

[0046] The blocking ring 4 includes a first blocking ring 401 and a second blocking ring 402. The first blocking ring 401 is arranged below the top cover 1 and outside the first fixing assembly 301. The second blocking ring 402 is arranged on the inner wall of the mixing barrel 2.

[0047] The sealing lip 5 includes a first sealing lip 501 arranged on the first fixing assembly 301 and a second sealing lip 502 arranged on the second fixing assembly 302. The first sealing lip 501 is annularly arranged at the bottom of the first fixing assembly 301. The second sealing lip 502 is annularly arranged at the top of the second fixing assembly 302. The bottom end of the first sealing lip 501 is in sliding contact with the second blocking ring 402. The top end of the second sealing lip 502 is in sliding contact with the first blocking ring 401.

[0048] The negative pressure dust extraction assembly 6 is arranged on the top cover 1. The negative pressure dust extraction assembly 6 includes a pulse back-blowing dust collector 601 and a hose 602. The first sealing lip 501 and the second sealing lip 502 are arranged in a radial direction to form a sealing cavity 7 in the shape of a ring. The sealing cavity 7 is surrounded by the top cover 1, the mixing barrel 2, the first sealing lip 501, and the second sealing lip 502. The pulse back-blowing dust collector 601 extracts air in the sealing cavity 7 through the hose 602, so that the sealing cavity 7 is in a negative pressure state when the mixing barrel 2 rotates.

[0049] In the above-mentioned illustrative embodiment, the first fixing assembly 301 of the top cover 1 is arranged with the first sealing lip 501 and is in sliding connection with the second blocking ring 402 in the mixing barrel 2. The first fixing assembly 301 extends into the mixing barrel 2 to play a positioning role. The second fixing assembly 302 of the mixing barrel 2 is arranged with the second sealing lip 502 and is in sliding connection with the first blocking ring 401 of the top cover 1. After the first sealing lip 501 and the second sealing lip 502 are installed, an annular sealing cavity 7 is formed between them. The pulse back-blowing dust collector 601 in the negative pressure dust extraction assembly 6 extracts air and material dust in the sealing cavity 7 through the hose 602, so that the air pressure in the sealing cavity 7 is less than the atmospheric pressure. When the mixture is mixed, the top cover 1 is fixed and the mixing barrel 2 starts to rotate for mixing. While the double-layer sealing lip 5 provides sealing, the sealing cavity 7 is in a negative pressure state. Gases move from high pressure to low pressure, generating an airflow from the outside to the sealing cavity. The material dust in the sealing cavity 7 cannot spread to the outside and can only be sucked by the pulse back-blowing dust collector 601. In this way, the sealing property of the mixing device when rotating to mix the material is greatly enhanced. The material dust in the sealing cavity 7 is timely extracted, which avoids the material dust from adhering to the sealing lip 5 and other components for a long time, avoids corrosion to the components, and improves the service life of the sealing device. The overall structure of the device is simple, easy to disassemble, and convenient to use and maintain.

[0050] In some embodiments, as Figures 1-3As shown, the inner side surface of the first blocking ring 401 is inclined, the outer side surface of the second sealing lip 502 is in sliding contact with the inner side surface of the first blocking ring 401, the first blocking ring 401 pushes the second sealing lip 502 inward to make the top of the second sealing lip 502 inclined inward. The second sealing lip 502 is made of elastic synthetic material, and the first blocking ring 401 pushes the second sealing lip 502 to make the second sealing lip 502 deformed. Because the second sealing lip 502 is elastic, after being bent, the second sealing lip 502 produces elastic deformation, and the elastic force generated acts on the first blocking ring 401, achieving better sealing effect. The surface of the first blocking ring 401 is inclined, and the second sealing lip 502 is attached to the inclined surface after being bent. The inclined attachment surface can cooperate with the bent second sealing lip 502, increase the contact area of the attachment position of the two, improve the sealing performance, and also avoid that the attachment position of the first blocking ring 401 and the second sealing lip 502 is too sharp to damage the structure of the second sealing lip 502. The second sealing lip 502 is attached to the inclined surface on the inner side of the first blocking ring 401. Under the action of inertia, when the mixing barrel 2 rotates, the second sealing lip 502 will generate centrifugal force. The centrifugal force generated acts outward on the first blocking ring 401, so that the second sealing lip 502 is tightly pressed on the first blocking ring 401, thereby enhancing the attachment effect between the second sealing lip 502 and the first blocking ring 401, making it difficult for external air to enter the sealing cavity 7, and enhancing the negative pressure state of the sealing cavity 7.

[0051] In some embodiments, as shown in Figures 1-3 The first sealing lip 501 extends into the mixing barrel 2 through the port at the top end of the mixing barrel 2 and is in sliding contact with the second blocking ring 402. The sliding of the first sealing lip 501 into the mixing barrel 2 can completely block the annular gap between the top cover 1 and the mixing barrel 2, and play a blocking role when the material is flying, reducing the diffusion of the flying dust of the material.

[0052] In some embodiments, as shown in Figures 1-3As shown, the inner side surface of the second blocking ring 402 is inclined, the outer side surface of the first sealing lip 501 is in sliding contact with the inner side surface of the second blocking ring 402, the second blocking ring 402 pushes the first sealing lip 501 inward to make the bottom of the first sealing lip 501 inclined inward. The second blocking ring 402 pushes the first sealing lip 501 to bend, the first sealing lip 501 is made of elastic synthetic material, after bending, the first sealing lip 501 produces elastic deformation, the elastic force produced acts on the second blocking ring 402, and better sealing effect is achieved. At the same time, the surface of the second blocking ring 402 is inclined, the first sealing lip 501 is in contact with the inclined surface after bending, the inclined surface is arranged to cooperate with the bent first sealing lip 501, increase the contact area of the contact part of the two, improve the sealing performance, and also can avoid that the shape of the contact position of the second blocking ring 402 and the first sealing lip 501 is too sharp to damage the structure of the first sealing lip 501. The first sealing lip 501 is in contact with the inclined surface on the inner side of the second blocking ring 402, under the action of inertia, when the mixing barrel 2 rotates, the first sealing lip 501 will produce centrifugal force, the centrifugal force produced acts outward on the second blocking ring 402, so that the first sealing lip 501 is tightly pressed on the second blocking ring 402, so as to enhance the contact effect between the first sealing lip 501 and the second blocking ring 402, and avoid that the elastic force of the first sealing lip 501 is not enough to separate from the second blocking ring 402.

[0053] In some embodiments, as Figures 1-2As shown, the first fixing assembly 301 includes a first clamping piece 3011, which further includes a first sealing support ring 3011-1, a first sealing gasket 3011-2, and a first clamping strip 3011-3. The first sealing support ring 3011-1 is connected to the lower surface of the top cover 1. Further, the first sealing support ring 3011-1 and the first clamping strip 3011-3 clamp the first sealing gasket 3011-2 therebetween. The first sealing gasket 3011-2 has a longitudinal length smaller than that of the first sealing support ring 3011-1 and the first clamping strip 3011-3. The first sealing support ring 3011-1, the first sealing gasket 3011-2, and the first clamping strip 3011-3 form an inverted concave structure. The first sealing lip 501 is arranged at the notch between the first sealing support ring 3011-1 and the first clamping strip 3011-3 and abuts against the first sealing gasket 3011-2. The first sealing support ring 3011-1 is directly fixed below the top cover 1. The first clamping piece 3011 is connected to the top cover 1 through the first sealing support ring 3011-1. The first sealing support ring 3011-1 is welded on the top cover 1, which does not weaken the cross section of the component, saves steel, and is simple and convenient. Meanwhile, the first sealing gasket 3011-2 and the first clamping strip 3011-3 are stacked on the first sealing support ring 3011-1, which adopts a three-piece design and does not need to use an integrated assembly. The amount of mechanical processing of cutting pins is small. When disassembled, the whole does not need to be replaced, which reduces production costs. Meanwhile, the size can be freely selected for assembly according to the size of the first sealing lip 501. The inverted concave structure formed by the first sealing support ring 3011-1, the first sealing gasket 3011-2, and the first clamping strip 3011-3 has a positioning effect. The first sealing lip 501 is inserted along the notch to complete the installation. Meanwhile, the notch shape matches the first sealing lip 501, and other limiting assemblies do not need to be arranged.

[0054] In some embodiments, as Figures 1-2As shown, the first fixing assembly 301 further comprises a first fixing bolt 3012, the first fixing bolt 3012 is threaded through the first clamping piece 3011 to fix the first clamping strip 3011-3 and the first sealing gasket 3011-2 on the first sealing support ring 3011-1, and the first fixing bolt 3012 holds and fixes the first sealing lip 501 on the first sealing support ring 3011-1 through the first clamping strip 3011-3. The first fixing bolt 3012 holds and fixes the first sealing lip 501 on the first sealing support ring 3011-1 through the first clamping strip 3011-3. The first sealing support ring 3011-1 is provided with a threaded hole, and the first fixing bolt 3012 enters the threaded hole after being threaded through the first clamping piece 3011 and the first sealing gasket 3011-2, and the first fixing bolt 3012 is threaded and fixed, which is stable in structure. The first fixing bolt 3012 can provide strong holding force to the first clamping strip 3011-3 and the first sealing gasket 3011-2, so as to avoid loosening of the first clamping strip 3011-3 and the first sealing gasket 3011-2 and affect the sealing effect, and the disassembly can be completed by only unscrewing the first fixing bolt 3012 from the first sealing support ring 3011-1. When fixing, the first fixing bolt 3012 is tightened to exert greater holding force on the first clamping strip 3011-3, the contact area between the first fixing bolt 3012 and the first clamping strip 3011-3 can be increased by clamping the second sealing lip 502 with the first clamping strip 3011-3, the pressure of the first clamping strip 3011-3 on the first sealing lip 501 is increased, and the stability of the connection of the first sealing lip 501 in the notch is ensured. At the same time, the first sealing lip 501 is arranged in the notch, the first fixing bolt 3012 does not need to pass through the first sealing lip 501 when fixing, and when the first sealing lip 501 needs to be replaced, the first sealing lip 501 can be taken out from between the first sealing support ring 3011-1 and the first clamping strip 3011-3 by unscrewing the first fixing bolt 3012 with a tool.

[0055] In some embodiments, as shown in Figure 1 、 Figure 3 The second fixing assembly 302 comprises:

[0056] a fixing seat 3021 arranged on the outer wall of the mixing barrel 2;

[0057] The second clamping piece 3022 is arranged on the side of the fixing seat 3021 away from the outer wall surface of the mixing barrel 2. The second clamping piece 3022 further comprises a second sealing support ring 3022-1, a second sealing gasket 3022-2 and a second clamping strip 3022-3. The second sealing support ring 3022-1 and the second clamping strip 3022-3 clamp the second sealing gasket 3022-2 in the middle. The second sealing gasket 3022-2 has a longitudinal length smaller than the second sealing support ring 3022-1 and the second clamping strip 3022-3. The second sealing support ring 3022-1, the second sealing gasket 3022-2 and the second clamping strip 3022-3 form a concave structure. The second sealing lip 502 is arranged at the notch between the second sealing support ring 3022-1 and the second clamping strip 3022-3 and abuts against the second sealing gasket 3022-2. The second clamping piece 3022 is installed on the fixing seat 3021 and can be freely adjusted, quickly disassembled and assembled by using modular installation. In the second clamping piece 3022, the concave structure formed by the second sealing support ring 3022-1, the second sealing gasket 3022-2 and the second clamping strip 3022-3 adopts a three-piece design, does not need to use an integral component, has a small amount of mechanical processing cutting, and is quickly disassembled and assembled by using a stacking installation mode. When maintenance and replacement are needed, only the component needing maintenance needs to be disassembled, without the need for overall replacement. At the same time, the size of the second sealing lip 502 can be freely selected for assembly according to the size, has high flexibility and saves costs. The concave design has a positioning effect. The second sealing lip 502 is inserted into the notch to complete positioning and installation. The notch shape is matched with the second sealing lip 502. The device is simple and does not need to additionally arrange a limiting component, thereby saving costs.

[0058] In some embodiments, as Figure 1 , Figure 3As shown, the second fixing assembly 302 further comprises a second fixing bolt 3023, which is connected with the fixing seat 3021 after penetrating the second clamping piece 3022, so as to fix the second clamping piece 3022 on the fixing seat 3021. The second fixing bolt 3023 presses and fixes the second sealing lip 502 on the second sealing support ring 3022-1 through the second clamping strip 3022-3. The positioning seat is internally provided with a threaded hole matched with the second fixing bolt 3023, and the second fixing bolt 3023 is detachably installed in the threaded hole after penetrating the second clamping piece 3022. The overall structure of the device is stable, and when installing, the second fixing bolt 3023 can provide strong pressing force to the second clamping piece 3022, so as to firmly fix the second clamping piece 3022 on the fixing seat 3021. Meanwhile, the second fixing bolt 3023 is adopted for connection, and when disassembling, the second fixing bolt 3023 is only needed to be screwed out of the threaded hole in the positioning seat by using a tool, so that the second clamping piece 3022 can be separated from the fixing seat 3021, thereby facilitating maintenance and replacement. The second fixing bolt 3023 presses and fixes the second sealing lip 502 on the second sealing support ring 3022-1 through the second clamping strip 3022-3. When fixing, the second fixing bolt 3023 is tightened to exert greater pressing force on the second clamping strip 3022-3. The second clamping strip 3022-3 clamping the second sealing lip 502 can increase the contact area between the second fixing bolt 3023 and the second clamping strip 3022-3, and increase the pressure, so as to ensure the stability of the first sealing lip 501 connected in the notch. Meanwhile, the second sealing lip 502 is arranged at the notch, and the second fixing bolt 3023 does not need to penetrate the second sealing lip 502 when fixing. When the second sealing lip 502 needs to be replaced, the second sealing lip 502 can be taken out from between the second sealing support ring 3022-1 and the second clamping strip 3022-3 by loosening the second fixing bolt 3023 with a tool.

[0059] In some embodiments, as Figure 1As shown, two air suction nozzles 8 are oppositely arranged on the top cover 1 above the sealed cavity 7, and the air suction nozzles 8 are communicated with the sealed cavity 7 through the hoses 602. By connecting the hoses 602 and the sealed cavity 7 through the air suction nozzles 8, the hoses 602 and the air suction nozzles 8 are convenient to install, and when the sizes of the hoses 602 and the air suction nozzles 8 are not matched, only the air suction nozzles 8 of different specifications need to be replaced, without the need to open holes on the top cover 1, the air suction nozzles 8 can be recycled multiple times, saving costs, and the air suction nozzles 8 can be quickly installed and disassembled on the top cover 1, facilitating later maintenance and replacement. At the same time, two air suction nozzles 8 are oppositely arranged in the technical solution, and after connecting the pulse reverse blow dust collector 601 through two hoses 602, the pulse reverse blow dust collector 601 starts to suck air from both sides at the same time, which can improve the air extraction speed in the sealed cavity 7, so that the sealed cavity 7 can reach a negative pressure state faster, and simultaneously sucking air from both sides can improve the extraction efficiency of the material dust, avoiding the situation that the material dust far away from the air suction nozzles 8 cannot be sucked due to insufficient suction force of the pulse reverse blow dust collector 601.

[0060] In some embodiments, as shown in Figure 1 As shown, the pulse reverse blow dust collector 601 is provided with a dust discharge port 9, the dust discharge port 9 is communicated with the internal space of the mixing barrel 2 through the top cover 1, and the dust discharge port 9 is provided with a valve 10. The pulse reverse blow dust collector 601 re-discharges the material dust sucked from the sealed cavity 7 into the mixing barrel 2 through the dust discharge port 9 for mixing, reducing the waste of materials, and at the same time, the material dust sucked in the pulse reverse blow dust collector 601 will be automatically layered due to different densities, and the layered material can be intermittently discharged into the mixing barrel 2 through the valve 10, so as to ensure the consistency of the ingredients of each batch of mixed materials.

[0061] Finally, it should be noted that: the embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts of each embodiment can be referred to.

[0062] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit it; although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the specific embodiments of the present application can be modified or some technical features can be replaced by equivalents; without departing from the spirit of the technical solutions of the present application, they should be covered in the technical solution range of the present application.

Claims

1. A double-lip negative pressure sealing device, characterized in that, include: Top cover (1); A mixing tank (2) is rotatably disposed below the top cover (1); The fixing component (3) includes a first fixing component (301) and a second fixing component (302). The first fixing component (301) is arranged around the bottom of the top cover (1) and extends into the mixing tank (2) from the top port of the mixing tank (2). The second fixing component (302) is arranged around the outer wall of the mixing tank (2). The baffle ring (4) includes a first baffle ring (401) and a second baffle ring (402). The first baffle ring (401) is disposed below the top cover (1) and on the outside of the first fixing component (301). The second baffle ring (402) is disposed on the inner wall of the mixing tank (2). A sealing lip (5) includes a first sealing lip (501) mounted on the first fixing component (301) and a second sealing lip (502) mounted on the second fixing component (302). The first sealing lip (501) is annularly disposed at the bottom of the first fixing component (301), and the second sealing lip (502) is annularly disposed at the top of the second fixing component (302). The bottom end of the first sealing lip (501) is in sliding contact with the second retaining ring (402) for a circumference, and the outer surface of the first sealing lip (501) is in sliding contact with the inner surface of the second retaining ring (402). During rotation... Driven by the mixing tank (2), the top of the second sealing lip (502) slides in contact with the first retaining ring (401) around its circumference through centrifugal force, and the outer surface of the second sealing lip (502) slides in contact with the inner surface of the first retaining ring (401); the inner surface of the first retaining ring (401) is inclined, and the first retaining ring (401) pushes the second sealing lip (502) inward so that the top of the second sealing lip (502) tilts inward; the inner surface of the second retaining ring (402) is inclined, and the second retaining ring (402) pushes the first sealing lip (501) inward so that its bottom tilts inward; The negative pressure dust extraction assembly (6) is located on the top cover (1). The negative pressure dust extraction assembly (6) includes a pulse back-blowing dust collector (601) and a hose (602). The first sealing lip (501) and the second sealing lip (502) are arranged radially at intervals to form a sealed cavity (7) enclosed by the top cover (1), the mixing tank (2), the first sealing lip (501) and the second sealing lip (502) in an annular shape. The pulse back-blowing dust collector (601) extracts air from the sealed cavity (7) through the hose (602) so that the sealed cavity (7) is in a negative pressure state when the mixing tank (2) rotates.

2. The double-lip negative pressure sealing device according to claim 1, characterized in that: The first sealing lip (501) extends into the mixing barrel (2) from the port at the top of the mixing barrel (2) and slides in contact with the second retaining ring (402).

3. The double-lip negative pressure sealing device according to claim 1, characterized in that: The first fixing component (301) includes a first clamping member (3011), which further includes a first sealing support ring (3011-1), a first sealing gasket (3011-2), and a first clamping strip (3011-3). The first sealing support ring (3011-1) is connected to the lower surface of the top cover (1). Furthermore, the first sealing support ring (3011-1) and the first clamping strip (3011-3) clamp the first sealing gasket (3011-2) in the middle. The longitudinal length of the sealing gasket (3011-2) is less than that of the first sealing support ring (3011-1) and the first clamping strip (3011-3). The first sealing support ring (3011-1), the first sealing gasket (3011-2), and the first clamping strip (3011-3) form an inverted concave structure. The first sealing lip (501) is located at the recess between the first sealing support ring (3011-1) and the first clamping strip (3011-3) and abuts against the first sealing gasket (3011-2).

4. The double-lip negative pressure sealing device according to claim 3, characterized in that: The first fixing component (301) further includes a first fixing bolt (3012), which passes through the first clamping member (3011) to fix the first clamping bar (3011-3) and the first sealing gasket (3011-2) on the first sealing support ring (3011-1). The first fixing bolt (3012) presses and fixes the first sealing lip (501) on the first sealing support ring (3011-1) through the first clamping bar (3011-3).

5. The double-lip negative pressure sealing device according to claim 1, characterized in that: The second fixing component (302) includes: A fixing seat (3021) is installed on the outer wall surface of the mixing tank (2); The second clamping member (3022) is disposed on the side of the fixed base (3021) away from the outer wall of the mixing tank (2). The second clamping member (3022) further includes a second sealing support ring (3022-1), a second sealing gasket (3022-2), and a second clamping strip (3022-3). The second sealing support ring (3022-1) and the second clamping strip (3022-3) clamp the second sealing gasket (3022-2) in the middle. (3022-2) has a longitudinal length less than that of the second sealing support ring (3022-1) and the second clamping strip (3022-3). The second sealing support ring (3022-1), the second sealing gasket (3022-2) and the second clamping strip (3022-3) form a concave structure. The second sealing lip (502) is located at the recess between the second sealing support ring (3022-1) and the second clamping strip (3022-3) and abuts against the second sealing gasket (3022-2).

6. The double-lip negative pressure sealing device according to claim 5, characterized in that: The second fixing component (302) further includes a second fixing bolt (3023), which passes through the second clamping member (3022) and is connected to the fixing seat (3021) so that the second clamping member (3022) is fixed on the fixing seat (3021). The second fixing bolt (3023) presses and fixes the second sealing lip (502) on the second sealing support ring (3022-1) through the second clamping bar (3022-3).

7. The double-lip negative pressure sealing device according to claim 1, characterized in that: Two suction nozzles (8) are disposed opposite each other on the top cover (1) above the sealing cavity (7), and the suction nozzles (8) are connected to the hose (602) and the sealing cavity (7).

8. The double-lip negative pressure sealing device according to claim 1, characterized in that: The pulse jet dust collector (601) is provided with a dust discharge port (9), which passes through the top cover (1) and communicates with the internal space of the mixing tank (2). A valve (10) is provided on the dust discharge port (9).

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