Blender and sealing method thereof

Abstract

The application provides a mixer and a sealing method thereof, the mixer comprising a main body, a stirring shaft, a pneumatic valve, a lubricating pump and a gas source, the main body being provided with a discharge port, a gas inlet and a lubricating medium inlet; a shaft end of the stirring shaft is configured with a sealing cavity communicating with the gas inlet and the lubricating medium inlet respectively; the pneumatic valve is configured to control the opening and closing of the discharge port; the lubricating pump is connected with the lubricating medium inlet through a medium conveying pipeline; and the gas source is configured to be switchably connected with the gas inlet and the pneumatic valve through a gas conveying pipeline. The mixer provided by the application combines the lubricating medium sealing and the gas sealing, utilizes the gas sealing to form a gas curtain barrier and an activation and flow assisting effect on the slurry, improves the reliability of the shaft end sealing and the slurry stirring effect, reduces the consumption of the lubricating medium, reduces the adverse effect of the lubricating medium on the slurry solidification effect, and solves the problem of the influence of the shaft end sealing of the existing mixer on the slurry solidification.

Description

Technical Field

[0001] This invention relates to the field of engineering machinery technology, specifically to a mixer and its sealing method. Background Technology

[0002] Tailings mixers are widely used in mining backfilling, chemical industry and other fields. The performance of the mixer is related to the structural strength and filling efficiency of the backfill material. However, traditional mixers have a high frequency of shaft end leakage and shaft end bearing wear, which can easily lead to problems such as component failure, equipment failure and shutdown.

[0003] Existing mixer shaft end seals mainly employ mechanical seals or grease-lubricated seals. For example, Chinese patent document CN109268505A discloses a shaft end seal structure for a full tailings paste mixer, which uses double-row tapered roller bearings to reduce the radial runout of the mixing shaft and sets up a combination of sealing rings such as packing, dust seals, and YX rings in the sealing cavity, combined with grease lubrication to achieve sealing. This solution improves the sealing performance to a certain extent, but because the sealing medium (grease) is continuously and passively supplied, the consumption is large, and the grease can easily enter the interior of the slurry, which will adversely affect the mixing and solidification effect of the slurry.

[0004] Therefore, the existing shaft end seal of the mixer has the problem of affecting the solidification of the slurry, and there is an urgent need for a mixer with better slurry mixing and solidification effect. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a mixer and its sealing method, which at least solves the problem of the existing mixer shaft end seal affecting the solidification of slurry.

[0006] To achieve the above objectives, the present invention provides the following technical solution: In a first aspect, embodiments of the present invention provide a mixer, including a main body, a stirring shaft, a pneumatic valve, a lubrication pump, and a gas source. The main body is provided with a discharge port, a gas inlet, and a lubrication medium inlet. The shaft end of the stirring shaft is constructed with a sealed cavity that communicates with the gas inlet and the lubrication medium inlet respectively. The pneumatic valve is configured to control the opening and closing of the discharge port. The lubrication pump is connected to the lubrication medium inlet through a medium delivery pipeline. The gas source is configured to be switchably connected to the gas inlet and the pneumatic valve through a gas delivery pipeline.

[0007] Furthermore, the mixer also includes a filter pressure regulating valve, a primary solenoid valve, and a secondary solenoid valve. The filter pressure regulating valve is located between the gas source and the primary solenoid valve. The primary solenoid valve is connected to the gas inlet and the secondary solenoid valve, respectively. The secondary solenoid valve is connected to the pneumatic valve.

[0008] Furthermore, the secondary solenoid valve has an air inlet, a first air outlet, and a second air outlet. The air inlet is connected to the primary solenoid valve, and the first air outlet and the second air outlet are respectively connected to the opening control port and the closing control port of the pneumatic valve.

[0009] Furthermore, the main body includes a main stirring mechanism and a secondary stirring mechanism, both of which are provided with mounting bases, and each of the two mounting bases is provided with a gas inlet and a lubricating medium inlet.

[0010] Furthermore, the primary solenoid valve has a first outlet and a second outlet. The first outlet is connected to the two gas inlets via two gas pipelines, and the second outlet is connected to the secondary solenoid valve.

[0011] Furthermore, the mixer also includes a manual lubrication mechanism, which is connected to both the main mixing mechanism and the auxiliary mixing mechanism.

[0012] Furthermore, a floating seal ring is provided on the stirring shaft of the main stirring mechanism, and the manual lubrication mechanism includes a first lubrication point and a second lubrication point. The first lubrication point is connected to the outer side of the floating seal ring, and the second lubrication point is connected to the inner side of the floating seal ring.

[0013] Furthermore, the manual lubrication mechanism also includes a third lubrication point, which is connected to the sealed cavity of the auxiliary stirring mechanism.

[0014] Furthermore, the mixer also includes a pressure regulating valve and a one-way valve, which are installed in the gas supply pipeline, with the one-way valve located near the gas inlet.

[0015] Secondly, embodiments of the present invention also provide a mixer sealing method, applied to the mixer proposed in the first aspect, the method comprising: Control the lubrication pump to deliver lubrication medium to the lubrication medium inlet, so that the lubrication medium enters the sealed cavity; The gas source is controlled to continuously supply compressed gas to the gas inlet, so that the compressed gas enters the sealed cavity; When it is necessary to empty the slurry in the mixer, the gas source is switched from being connected to the gas inlet to being connected to the pneumatic valve, so as to control the pneumatic valve to open the discharge port.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention combines a lubricating medium (such as grease) seal with a compressed gas seal. The two sealing methods work synergistically. The gas seal forms an air curtain barrier, effectively preventing slurry intrusion and significantly improving the reliability of the shaft end seal. Furthermore, the gas is evenly distributed along the sealing cavity, activating and aiding the flow of the slurry within the mixer while simultaneously achieving a seal, promoting uniform suspension of slurry particles and further enhancing the mixing effect. In this invention, the gas source is not only used for sealing but can also automatically open and close the discharge port by switching pneumatic valves, eliminating the need for additional power sources or electrical actuators, thus reducing equipment costs and potential failure points. Based on the gas seal, the consumption of the lubricating medium can be reduced, thereby mitigating the adverse effects of the lubricating medium on the slurry solidification effect and solving the problem of existing mixer shaft end seals affecting slurry solidification. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the sealing principle of the mixer according to an embodiment of the present invention; Figure 2 This is a schematic diagram of a partial structure of the main stirring unit in an embodiment of the present invention; Figure 3 This is a schematic diagram of the mixer according to an embodiment of the present invention. Detailed Implementation

[0019] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. 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.

[0020] The mixer provided in this invention can solve the problem of the shaft end seal of existing mixers affecting the solidification of slurry. The invention will be further described in detail below with reference to the accompanying drawings.

[0021] like Figures 1 to 3As shown, an embodiment of the present invention provides a mixer 100, which includes a main body, a stirring shaft, a pneumatic valve 60, a lubrication pump 40, and an air source. The main body is provided with a discharge port, a gas inlet 11, and a lubrication medium inlet 12. The shaft end of the stirring shaft is constructed with a sealed cavity 13 that communicates with the gas inlet 11 and the lubrication medium inlet 12 respectively. The pneumatic valve 60 is configured to control the opening and closing of the discharge port. The lubrication pump 40 is connected to the lubrication medium inlet 12 through a medium delivery pipeline. The air source is configured to be switchably connected to the gas inlet 11 and the pneumatic valve 60 through a gas delivery pipeline.

[0022] The mixer 100 provided in this embodiment includes a main body and a stirring shaft. The main body includes a motor and a stirring tank. The stirring shaft is installed inside the stirring tank and is drivenly connected to the motor. The stirring tank is provided with a discharge port for discharging the slurry inside the tank. In an optional embodiment, the main body also includes a mounting base 14 and a sealing assembly. A gas inlet 11 and a lubricating medium inlet 12 are disposed on the mounting base 14. A sealing cavity 13 is disposed in the mounting base 14 and the sealing assembly and communicates with the gas inlet 11 and the lubricating medium inlet 12.

[0023] Based on the above embodiments, the mixer 100 proposed in this embodiment can achieve airtight or lubricating medium sealing. When the gas source is connected to the gas inlet 11 through the gas pipeline, it can deliver compressed air into the sealed cavity 13; the lubricating pump 40 can deliver lubricating medium into the sealed cavity 13 through the medium delivery pipeline.

[0024] Furthermore, the lubricating medium can be grease, or other lubricating media besides grease, such as synthetic lubricating oil (polyalphaolefin, synthetic ester oil), semi-fluid lubricating grease, water-based lubricating medium, or solid lubricant (such as PTFE-based self-lubricating composite material). The specific selection of the lubricating medium can be determined according to the properties of the actual material being stirred and the ambient temperature of the working environment; this embodiment does not impose specific limitations on this.

[0025] Based on the above embodiments, the air source can continuously supply compressed air to the sealed cavity 13, and the lubrication pump 40 can intermittently supply lubricating medium to the sealed cavity 13. The supply interval and the amount supplied each time can be adjusted according to the operating conditions of the mixer 100 (such as speed, load, slurry concentration, etc.). For example, the supply interval can be appropriately shortened under high concentration and high wear conditions; the supply interval can be extended or the oil supply can be reduced under light load conditions. In this embodiment, based on the continuous supply of compressed gas, by adjusting the supply amount of lubricating medium, the consumption of lubricating medium can be minimized while ensuring the sealing effect, thereby reducing the impact of the lubricating medium on the slurry.

[0026] Furthermore, in this embodiment, the air source can also be connected to the pneumatic valve 60. When the air source is connected to the pneumatic valve 60, the air source is disconnected from the gas inlet 11 and the sealing cavity 13. At this time, the sealing cavity 13 is sealed with a lubricating medium to ensure the sealing effect. When the air source is connected to the pneumatic valve 60, the pneumatic valve 60 can control the discharge port of the mixer 100 to open or close.

[0027] For example, when the mixer 100 is working normally, the lubrication pump 40 intermittently delivers lubricating medium, which enters the sealing cavity 13 and forms a grease sealing layer at the shaft end. At the same time, the air source continuously delivers compressed air. After the compressed air enters the sealing cavity 13, it is evenly distributed along a specific channel in the shaft end sealing structure to form an air curtain seal, preventing external slurry from intruding. When it is necessary to empty the slurry in the mixer 100, the air source is switched to be connected to the pneumatic valve 60. The pneumatic valve 60 controls the opening of the discharge port for discharge. After the discharge is completed, the pneumatic valve 60 controls the closing of the discharge port. Since the switching process is extremely short and the lubricating medium ensures the seal, this embodiment does not affect the shaft end sealing effect. Moreover, since the air source can automatically open and close the discharge port by switching the pneumatic valve 60, the mixer 100 does not need to be equipped with an additional power source or complex electronic control actuator, which reduces equipment costs and potential failure points.

[0028] Furthermore, such as Figure 1 As shown, the mixer 100 also includes a filter pressure regulating valve 31, a primary solenoid valve 32, and a secondary solenoid valve 33. The filter pressure regulating valve 31 is located between the gas source and the primary solenoid valve 32. The primary solenoid valve 32 is connected to the gas inlet 11 and the secondary solenoid valve 33, respectively. The secondary solenoid valve 33 is connected to the pneumatic valve 60. The secondary solenoid valve 33 has an air inlet, a first air outlet, and a second air outlet. The air inlet of the secondary solenoid valve 33 is connected to the primary solenoid valve 32, and the first and second air outlets of the secondary solenoid valve 33 are connected to the opening control port and the closing control port of the pneumatic valve 60, respectively.

[0029] In one alternative implementation, such as Figure 1 As shown, the main body includes a main stirring mechanism 101 and a secondary stirring mechanism 102. The main stirring mechanism 101 and the secondary stirring mechanism 102 can be arranged side by side, each with its own stirring tank. They can be equipped with separate or shared mounting bases 14. In this embodiment, it is taken that each of the two stirring mechanisms is equipped with a mounting base 14. Both mounting bases 14 of the two stirring mechanisms are provided with a gas inlet 11 and a lubricating medium inlet 12. Both the main stirring mechanism 101 and the secondary stirring mechanism 102 are equipped with mounting bases 14. Both mounting bases 14 are provided with a gas inlet 11 and a lubricating medium inlet 12. The main stirring mechanism 101 includes a main stirring shaft 151, and the secondary stirring mechanism 102 includes a secondary stirring shaft 152. Both mounting bases 14 and the sealing assembly form a sealing cavity 13 at the shaft end of the stirring shaft.

[0030] For further information, please refer to [link / reference]. Figure 1 The primary solenoid valve 32 has a first outlet and a second outlet. The first outlet is connected to two gas inlets 11 via two gas supply lines, and the second outlet is connected to the secondary solenoid valve 33. Accordingly, the gas system of the mixer 100 in this embodiment includes a gas source, which can be an air compressor. The outlet of the air compressor is connected to a filter pressure regulating valve 31. The filter pressure regulating valve 31 is used to filter moisture and impurities in the compressed gas and adjust the inlet pressure to a set value. The other side of the filter pressure regulating valve 31 is connected to the primary solenoid valve 32. The primary solenoid valve 32 has a first outlet and a second outlet. The first outlet is connected to the gas inlets 11 on the mounting base 14 of the main mixing mechanism 101 and the auxiliary mixing mechanism 102 via two gas supply lines, respectively. The second outlet is connected to the inlet of the secondary solenoid valve 33. The secondary solenoid valve 33 has a first outlet and a second outlet. The first outlet is connected to the opening control port of the pneumatic valve 60, and the second outlet is connected to the closing control port of the pneumatic valve 60.

[0031] Based on the above embodiments, the mixer 100 further includes a pressure regulating valve 34 and a one-way valve 35, which are installed in the gas supply pipeline, with the one-way valve 35 located near the gas inlet 11. In an optional embodiment, such as... Figure 1 As shown, the first outlet of the primary solenoid valve 32 is connected to the gas inlet 11 on the mounting base 14 of the main stirring mechanism 101 and the auxiliary stirring mechanism 102 via two gas supply lines. One set of pressure regulating valves 34 and one-way valves 35 is installed on the gas supply line connecting the main stirring mechanism 101, and another set of pressure regulating valves 34 and one-way valves 35 is installed on the gas supply line connecting the auxiliary stirring mechanism 102. Both sets of one-way valves 35 are located close to the mounting base 14, i.e., close to the gas inlet 11. In this embodiment, the pressure regulating valves 34 are used to adjust the gas pressure and flow rate on each branch to ensure gas pressure balance; the one-way valves 35 are used to prevent slurry backflow into the gas supply line when the gas source is suddenly interrupted, thus improving the reliability of the mixer 100.

[0032] Based on the above implementation methods, such as Figure 1 As shown, the lubrication pump 40 can be an electric lubrication pump, which has two discharge ports. The two discharge ports are connected to the lubrication medium inlets 12 on the mounting base 14 of the main stirring mechanism 101 and the auxiliary stirring mechanism 102 respectively through two medium conveying pipelines. Furthermore, the mounting base 14 of the main stirring mechanism 101 is also provided with a lubrication medium outlet, which is connected to a waste box 42 through a pipeline. The waste box 42 is used to collect the discharged lubrication medium and other waste materials.

[0033] Furthermore, such as Figure 1As shown, the mixer 100 also includes a manual lubrication mechanism 50, which is connected to the main mixing mechanism 101 and the auxiliary mixing mechanism 102 respectively. Based on the above embodiment, a tee 41 is provided on each of the two medium delivery pipelines connecting the lubrication pump 40 to the main mixing mechanism 101 and the auxiliary mixing mechanism 102. The third port of the tee 41 is used to communicate with the manual lubrication mechanism 50 in this embodiment so that lubricating medium can be manually injected when the lubrication pump 40 fails.

[0034] Based on the above embodiments, a floating seal ring 110 is provided on the stirring shaft of the main stirring mechanism 101, and the manual lubrication mechanism 50 includes a first lubrication point 51, a second lubrication point 52, and a third lubrication point 53. The first lubrication point 51 communicates with the outer side of the floating seal ring 110 to prevent slurry intrusion and further improve the sealing effect. The second lubrication point 52 communicates with the inner side of the floating seal ring 110 to lubricate and dissipate heat from the sealing surface of the floating seal ring 110. The third lubrication point 53 communicates with the sealing cavity 13 of the auxiliary stirring mechanism 102 to prevent slurry intrusion and further improve the sealing effect. Furthermore, the first lubrication point 51, the second lubrication point 52, and the third lubrication point 53 are centrally mounted on the same mounting plate and labeled for easy operator access.

[0035] In summary, the mixer 100 proposed in the first aspect of the present invention has the following beneficial effects: The mixer 100 proposed in this embodiment has a compact structure, simple control, and reliable sealing. By simultaneously employing lubricating medium sealing and compressed gas sealing, the two sealing methods work synergistically. The gas sealing forms an air curtain barrier, effectively preventing slurry intrusion and significantly improving the reliability of the shaft end seal. After entering the shaft end sealing cavity 13 from the bottom of the mounting base, the compressed gas is evenly distributed along a specific channel, which can also activate and aid the flow of the slurry in the tank, promoting uniform suspension of slurry particles and improving the mixing effect. Moreover, compressed air is a clean medium, readily available, and low in cost. The lubricating medium can be controlled by the lubrication pump 40 to be intermittent. The continuous supply method, while ensuring sealing with compressed air, reduces the consumption of lubricating medium and mitigates its adverse effects on the final solidification of the stirred slurry. The system utilizes a switchable connection between the gas inlet 11 and the pneumatic valve 60, achieving dual-use from a single source. This simplifies the system, eliminating the need for additional power sources or complex electrical control actuators, thus reducing equipment costs and potential failure points. Furthermore, the manual lubrication mechanism 50 allows for manual injection of sealing medium at the lubrication pump 40 in case of a malfunction, preventing equipment damage due to seal failure and enhancing the emergency response capability and reliability of the mixer 100.

[0036] An embodiment of the second aspect of the present invention provides a method for sealing a mixer, applied to the mixer 100 proposed in the first aspect. The method includes controlling a lubrication pump 40 to deliver lubrication medium to a lubrication medium inlet 12, so that the lubrication medium enters a sealing cavity 13; controlling a gas source to continuously deliver compressed gas to a gas inlet 11, so that the compressed gas enters the sealing cavity 13; and when it is necessary to empty the slurry in the mixer 100, switching the gas source from being connected to the gas inlet 11 to being connected to a pneumatic valve 60, so as to control the pneumatic valve 60 to open the discharge port.

[0037] In this embodiment, the lubrication pump 40 can intermittently supply lubrication medium to the lubrication medium inlet 12. During normal operation, lubrication medium and compressed gas can be supplied simultaneously or alternately. For example, at the initial stage of stirring shaft startup, a certain amount of lubrication medium can be supplied first to form an initial sealing layer. Then, the seal is mainly maintained by the continuously supplied compressed gas, and the lubrication medium is replenished periodically. This further reduces the total consumption of lubrication medium. When it is necessary to drain the slurry, in addition to switching the air source to drive the pneumatic valve 60, the supply of lubrication medium can be reduced during the draining process to avoid waste caused by the large amount of lubrication medium discharged with the slurry.

[0038] In one optional embodiment, when the mixer 100 is working normally, the lubrication pump 40 is controlled to intermittently supply lubrication medium to the lubrication medium inlet 12, for example, supplying oil once at a certain time interval. The lubrication medium enters the sealing cavity 13 and forms a grease sealing layer at the shaft end. At the same time, the air source is controlled to continuously supply compressed air to the gas inlet 11. Specifically, the compressed air passes through the filter pressure regulating valve 31, the first outlet of the first-stage solenoid valve 32, the pressure regulating valve 34, and the one-way valve 35. After entering the sealing cavity 13 from the bottom mounting base 14 of the main mixing mechanism 101 and the auxiliary mixing mechanism 102, it is evenly distributed along a specific channel in the shaft end sealing structure to form an air curtain seal, preventing external slurry from intruding. Moreover, the upward direction of the airflow is consistent with the direction of the slurry flow field inside the mixer 100, which can also suspend and assist the slurry.

[0039] When it is necessary to empty the slurry in the mixer 100, such as after the mixing operation is completed, this embodiment switches the gas source from being connected to the gas inlet 11 to being connected to the pneumatic valve 60. Specifically, the first-stage solenoid valve 32 is energized, the first outlet of the first-stage solenoid valve 32 is closed, and the second outlet is opened. The compressed gas then enters the second-stage solenoid valve 33. By controlling the reversal of the second-stage solenoid valve 33, the compressed gas enters the opening control port of the pneumatic valve 60, thereby opening the discharge port. After the slurry is completely emptied, the second-stage solenoid valve 33 can be controlled to reverse the reversal, allowing the compressed gas to enter the closing control port of the pneumatic valve 60, closing the discharge port. During this process, the compressed gas entering the sealing cavity 13 is interrupted. Since the switching process is extremely short, this process does not affect the sealing effect of the shaft end of the mixer 100, and since the lubrication pump 40 can provide lubricating medium, the sealing effect is further guaranteed.

[0040] The mixer sealing method proposed in this embodiment has the same technical effect as the mixer 100 proposed in the first aspect embodiment, and will not be described again here.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0042] The embodiments of the present invention have been described in detail above. Those skilled in the art can design and modify the device and its usage within the scope of the present invention according to the on-site construction conditions. The various embodiments in this specification are described in a related manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments.

[0043] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A mixer, characterized in that, include: The main body is provided with a discharge port, a gas inlet and a lubricating medium inlet; The stirring shaft has a sealed cavity at its shaft end that is respectively connected to the gas inlet and the lubricating medium inlet; A pneumatic valve, configured to control the opening and closing of the discharge port; A lubrication pump, wherein the lubrication pump is connected to the lubrication medium inlet via a medium delivery pipeline; The gas source is configured to be switchably connected to the gas inlet and the pneumatic valve via a gas pipeline, a filter pressure regulating valve, a primary solenoid valve, and a secondary solenoid valve. The filter pressure regulating valve is located between the gas source and the primary solenoid valve. The primary solenoid valve is connected to the gas inlet and the secondary solenoid valve respectively, and the secondary solenoid valve is connected to the pneumatic valve.

2. The mixer according to claim 1, characterized in that, The secondary solenoid valve has an air inlet, a first air outlet, and a second air outlet. The air inlet is connected to the primary solenoid valve, and the first air outlet and the second air outlet are respectively connected to the opening control port and the closing control port of the pneumatic valve.

3. The mixer according to claim 1, characterized in that, The main body includes a main stirring mechanism and a secondary stirring mechanism. Both the main stirring mechanism and the secondary stirring mechanism are provided with mounting bases, and each of the two mounting bases is provided with a gas inlet and a lubricating medium inlet.

4. The mixer according to claim 3, characterized in that, The primary solenoid valve has a first outlet and a second outlet. The first outlet is connected to the two gas inlets via two gas pipelines, and the second outlet is connected to the secondary solenoid valve.

5. The mixer according to claim 3, characterized in that, The mixer also includes a manual lubrication mechanism, which is connected to the main mixing mechanism and the auxiliary mixing mechanism respectively.

6. The mixer according to claim 5, characterized in that, The main stirring mechanism has a floating seal ring on its stirring shaft. The manual lubrication mechanism includes a first lubrication point and a second lubrication point. The first lubrication point is connected to the outer side of the floating seal ring, and the second lubrication point is connected to the inner side of the floating seal ring.

7. The mixer according to claim 6, characterized in that, The manual lubrication mechanism also includes a third lubrication point, which is connected to the sealed cavity of the auxiliary stirring mechanism.

8. The mixer according to claim 1, characterized in that, The mixer also includes a pressure regulating valve and a one-way valve, which are installed in the gas pipeline, with the one-way valve located near the gas inlet.

9. A method for sealing a mixer, applied to the mixer according to any one of claims 1-8, characterized in that, include: Control the lubrication pump to deliver lubrication medium to the lubrication medium inlet, so that the lubrication medium enters the sealed cavity; The gas source is controlled to continuously supply compressed gas to the gas inlet, so that the compressed gas enters the sealed cavity; When it is necessary to empty the slurry in the mixer, the gas source is switched from being connected to the gas inlet to being connected to the pneumatic valve, so as to control the pneumatic valve to open the discharge port.

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