Multi-shafting rotary sealing mechanism, stirring mechanism and spiral metering stock bin

Abstract

The invention discloses a multi-shafting rotary sealing mechanism, a stirring mechanism and a spiral metering stock bin, and relates to the technical field of multi-shafting sealing, the multi-shafting rotary sealing mechanism is applied between an inner shafting and an outer shafting and is matched with the inner shafting and the outer shafting to achieve sealing, and the outer shafting is arranged on the outer side of the inner shafting in a sleeving mode; the multi-shafting rotary sealing mechanism comprises a sealing base and at least one sealing piece. The sealing base is installed on the inner shaft system, and the sealing base is matched with the corresponding end of the outer shaft system to form a first sealing structure. The sealing element is mounted on the outer shaft system, and the sealing element is matched with the corresponding surface of the inner shaft system to form a second sealing structure; the stirring mechanism adopts a multi-shafting rotary sealing mechanism, and the spiral metering stock bin comprises the stirring mechanism; and the inner shaft system and the outer shaft system are fully sealed through two sealing structures.

Description

Technical Field

[0001] The invention relates to the technical field of multi-shaft system sealing, and in particular to a multi-shaft system rotary sealing mechanism, a stirring mechanism and a spiral metering silo. Background Art

[0002] As an advanced equipment that integrates feeding, metering and storage functions, the spiral metering silo has shown significant advantages and broad application prospects in the field of material processing, especially in the processing of granular and powdered materials. The spiral metering silo achieves efficient, accurate metering and stable storage of materials through a precisely controlled spiral conveying mechanism, greatly improving production efficiency and the convenience of material management.

[0003] However, while pursuing high efficiency and precision, the sealing mechanism of the traditional spiral metering silo also faces severe challenges in specific application environments. Traditional sealing methods mainly rely on the setting of sealing rings to ensure effective isolation between the transmission structures of the silo to prevent material leakage and external environmental pollution. Although this design performs well in most industrial scenarios, it has great limitations in special processing fields with extremely strict impurity control requirements, such as pharmaceutical processing, especially the production of powder injection drugs.

[0004] The pharmaceutical processing industry, especially when it comes to powder injection products that are directly injected into the human body, has almost stringent requirements on the cleanliness of the production environment and the purity of materials. The application of spiral metering silos in pharmaceutical processing first faces the problem of debris impurities caused by friction during the operation of the transmission structure. These tiny impurities may be negligible in the production of conventional industrial products, but in the field of pharmaceutical processing, they pose a serious safety hazard. Once these impurities are mixed into the drugs, they may not only affect the effectiveness of the drugs, but are more likely to cause unpredictable health risks or even life-threatening after use by patients.

[0005] In addition, the powder particles used in pharmaceutical processing are often very small in size. These tiny particles have strong penetration ability and may penetrate the tiny gaps of traditional seals and invade the mechanical internal transmission structure of the silo. This may not only cause blockage and wear of mechanical parts such as bearings, affecting the normal operation and maintenance costs of the equipment, but more seriously, once these powders contaminated by mechanical parts accumulate to a certain extent, they may reversely penetrate back into the silo and directly contaminate the pharmaceutical raw materials to be processed, forming a vicious cycle and seriously damaging the overall quality and safety of the drugs.

[0006] Therefore, for special processing fields with extremely high requirements for impurity control, such as pharmaceutical processing, the existing spiral metering silo sealing mechanism and transmission structure design have obvious deficiencies and cannot meet the industry's extremely high standards for material purity and production process cleanliness. Summary of the invention

[0007] The object of the present invention is to provide a multi-axis rotary sealing mechanism, a stirring mechanism and a spiral metering silo. By arranging the multi-axis rotary sealing mechanism in the spiral metering silo, sufficient sealing is performed to solve the problem that chips generated by friction during the operation of the transmission structure enter the material and the problem that powder contaminated by mechanical parts accumulates to a certain extent and reversely permeates back into the silo, directly contaminating the raw materials to be processed.

[0008] The purpose of the present invention can be achieved through the following technical solutions:

[0009] A multi-shaft system rotary sealing mechanism is used between an inner shaft system and an outer shaft system and cooperates with the inner shaft system and the outer shaft system to achieve sealing, wherein the outer shaft system is sleeved on the outer side of the inner shaft system;

[0010] The multi-shaft rotary sealing mechanism comprises a sealing base and at least one sealing element;

[0011] The sealing base is installed on the inner shaft system, and the sealing base cooperates with the corresponding end of the outer shaft system to form a first sealing structure;

[0012] The sealing member is installed on the outer shaft system, and the sealing member cooperates with the corresponding surface of the inner shaft system to form a second sealing structure.

[0013] As a further solution of the present invention: a collecting chamber is provided on the side of the sealing base facing the outer shaft system, a through assembly hole is provided at the center of the bottom surface of the collecting chamber, and the assembly hole is threadedly connected to the inner shaft system.

[0014] As a further solution of the present invention: the depth of the collecting chamber is greater than the depth of the sealing ring groove.

[0015] As a further solution of the present invention: at least one sealing ring groove is provided on the outer wall of the collecting chamber, and the sealing ring groove divides the outer wall of the collecting chamber into a plurality of concentrically arranged matching annular parts.

[0016] As a further solution of the present invention: the mating end surfaces of the outer shaft and the sealing base are provided with a mating annular groove mating with the mating annular portion.

[0017] As a further solution of the present invention: the matching annular groove and the matching annular portion are clearance matched, and the matching clearance is ≤0.5mm.

[0018] As a further solution of the present invention: a collecting part is provided at the bottom of the collecting chamber, and the collecting part includes a material guide slope 1 close to the inner shaft system, a material collection bin is provided at the other end of the material guide slope 1, a blocking part is provided at the other end of the material collection bin, and a material guide slope 2 is provided at the other end of the blocking part, and the material guide slope 2 is connected to the side wall of the collecting chamber.

[0019] As a further solution of the present invention: the sealing member is annular, and at least one group of cavities is formed on the side of the sealing member facing the inner shaft system, and the inner side surface of the sealing member is clearance-matched with the outer side surface of the inner shaft system.

[0020] As a further solution of the present invention: the fitting clearance between the seal and the inner shaft system is 0.1 mm.

[0021] As a further solution of the present invention: at least one set of retaining rings is arranged on the outer side surface of the sealing member, and the retaining rings include two half rings, and the half rings are arranged in close contact with the outer shaft system.

[0022] As a further solution of the present invention: the material of the half ring is copper.

[0023] As a further solution of the present invention: a stirring mechanism comprises a rotating shaft, a rotating sleeve is sleeved on the outer side of the rotating shaft, a fixed sleeve is sleeved on the outer side of the rotating sleeve, a first sealing mechanism is arranged between the rotating shaft and the rotating sleeve, and a second sealing mechanism is arranged between the rotating sleeve and the fixed sleeve;

[0024] The first sealing mechanism and / or the second sealing mechanism adopts the above-mentioned multi-axis rotary sealing mechanism.

[0025] As a further solution of the present invention: a spiral metering silo, comprising the above-mentioned stirring mechanism and a base, wherein a mounting frame is provided on the top of the base, a driving member 1 and a driving member 2 are installed on the mounting frame, and the driving member 1 and the driving member 2 are respectively connected to the rotating shaft and the rotating sleeve in a transmission manner;

[0026] It also includes a silo, the bottom of which is connected with a conveying pipe, and the stirring mechanism is extended into the silo.

[0027] Beneficial effects of the present invention:

[0028] The present invention fully seals the inner shaft system and the outer shaft system by setting a first sealing structure and a second sealing structure, wherein the first sealing structure cooperates with the outer shaft system through a sealing base to reduce the entry path space of tiny particles, further extend the entry path, and change the path trajectory to make the path more tortuous, thereby more effectively blocking the entry of tiny particles; the second sealing structure cooperates with the structure of the gap and the cavity, so that when tiny impurities that enter between the inner shaft system and the outer shaft system through the first sealing structure pass through the gap between the inner side surface of the seal and the outer side surface of the inner shaft system, the fluid resistance increases, and a greater air pressure is required to overcome these resistances, so that it is more difficult for the tiny impurities to pass through the gap, and even if they pass through the gap, the flow rate will slow down after entering the cavity, making it more difficult to pass through the next gap, and because the volume of the cavity is relatively large, the interaction force between the tiny impurities is enhanced or mutual collision and extrusion will occur during the deceleration process, resulting in an increase in the pressure on the tiny impurities as a whole, further blocking the possibility of tiny impurities entering from the outside passing through the gap.

[0029] The present invention arranges a multi-axis rotary sealing mechanism in the spiral metering silo, which can fully seal in special processing fields with extremely high requirements for impurity control, such as pharmaceutical processing, to prevent chips generated by friction during the operation of the transmission structure from entering the material, and also to prevent powder contaminated by mechanical parts from accumulating to a certain extent and reversely permeating back into the silo to directly contaminate the pharmaceutical raw materials to be processed. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described below in conjunction with the accompanying drawings.

[0031] Figure 1 It is a structural schematic diagram of Embodiment 1 of the present invention;

[0032] Figure 2 yes Figure 1 A schematic diagram of the enlarged structure of the middle A area;

[0033] Figure 3 yes Figure 1 Schematic diagram of the enlarged structure of the middle B area;

[0034] Figure 4 It is a structural schematic diagram of Embodiment 2 of the present invention;

[0035] Figure 5 This is a structural schematic diagram of a sealing member in Embodiment 2 of the present invention;

[0036] Figure 6 is a schematic cross-sectional structural diagram of a multi-shaft rotary sealing mechanism of Embodiment 1 adopted in Embodiment 3 of the present invention;

[0037] Figure 7 is a schematic cross-sectional structural diagram of a multi-shaft rotary sealing mechanism of Embodiment 2 adopted in Embodiment 3 of the present invention;

[0038] Figure 8 is a schematic structural diagram of Embodiment 3 of the present invention;

[0039] Fig. 9 This is a schematic diagram of the structure of the fourth embodiment of the present invention. Figure 1 ;

[0040] Fig.10 This is a schematic diagram of the structure of the fourth embodiment of the present invention. Figure 2 ;

[0041] Fig.11 This is a schematic diagram of the structure of the fourth embodiment of the present invention. Figure 3 ;

[0042] Fig.12 This is a schematic diagram of the structure of the fourth embodiment of the present invention. Figure 4 .

[0043] In the figure: 1, inner shaft system; 2, outer shaft system; 21, matching ring groove; 3, sealing base; 31, collecting chamber; 32, collecting bottom surface; 33, sealing ring groove; 34, collecting part; 341, material guide slope 1; 342, collecting bin; 343, blocking part; 344, material guide slope 2; 4, sealing element; 41, sealing ring; 42, cavity; 43, snap ring; 5, rotating shaft; 51, transmission gear; 52, conveying auger; 6, rotating sleeve; 61, bearing 1; 6 2. Partition limit sleeve; 63. Gasket; 64. Oil seal 1; 65. Agitator rod; 66. Transmission gear sleeve; 7. Fixed shaft sleeve; 71. Bearing 2; 72. Oil seal 2; 8. First sealing mechanism; 9. Second sealing mechanism; 101. Synchronous belt 1; 102. Drive member 1; 103. Synchronous belt 2; 104. Drive member 2; 105. Silo; 106. Base; 107. Mounting frame; 108. Delivery pipe; 109. Sealing shell; 110. Feed inlet. DETAILED DESCRIPTION

[0044] 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.

[0045] Embodiment 1

[0046] like Figure 1-Figure 3As shown, this embodiment provides a multi-axis rotary sealing mechanism, which is used between the inner axis system 1 and the outer axis system 2, and cooperates with the inner axis system 1 and the outer axis system 2 to achieve a sealing effect, and includes a sealing base 3 and at least one sealing member 4. The sealing base 3 is installed on the inner axis system 1, and cooperates with the corresponding end of the outer axis system 2 to form a first sealing structure. The sealing member 4 is installed inside the outer axis system 2, and cooperates with the outer side surface of the inner axis system 1 to form a second sealing structure. The inner axis system 1 and the outer axis system 2 are fully sealed by the two seals.

[0047] It should be noted in this embodiment that the above-mentioned outer shaft system 2 is sleeved on the outside of the inner shaft system 1, and the structures of the inner shaft system 1 and the outer shaft system 2 are not specifically limited. For example, the inner shaft system 1 can be a central transmission shaft structure, or a sleeve structure sleeved on the outside of the central transmission shaft, and the outer shaft system 2 can be a sleeve structure sleeved on the outside of the inner shaft system 1 and adjacent to the inner shaft system 1.

[0048] Further Figure 2 As shown, the sealing base 3 is provided with a collecting chamber 31 at the center of one side facing the end of the outer shaft system 2, and an assembly hole penetrating the sealing base 3 is provided at the center of the bottom surface of the collecting chamber 31. The sealing base 3 is fixedly installed on the inner shaft system 1 through the assembly hole, and the sealing base 3 is coaxially arranged with the inner shaft system 1 after installation.

[0049] Furthermore, in order to facilitate the installation and disassembly of the sealing base 3, the sealing base 3 can be cleaned or replaced regularly, thereby preventing tiny particles from entering between the inner shaft system 1 and the outer shaft system 2 to form impurities, produce accumulation, and reversely permeate polluted materials. The sealing base 3 of this embodiment is threadedly connected to the inner shaft system 1, and can be easily disassembled when cleaning and replacement are required, without causing damage to the inner shaft system 1, thereby saving parts costs.

[0050] Furthermore, in the present embodiment, at least one sealing ring groove 33 is provided in the middle portion of the outer side wall of the collecting chamber 31 of the sealing base 3. The sealing ring groove 33 divides the outer side wall of the collecting chamber 31 into a plurality of mating annular portions which are concentrically arranged inside and outside. The plurality of mating annular portions cooperate with the corresponding mating end faces of the outer shaft system 2 to form a seal. By extending the path for external tiny particles (such as powder) to enter the area between the inner shaft system 1 and the outer shaft system 2, it becomes more difficult for the materials to enter, thereby playing a certain sealing role.

[0051] Furthermore, in order to make the first sealing effect more effective, on the basis of not increasing the diameter size of the sealing base 3, a matching annular groove 21 is provided on the matching end surface of the outer shaft system 2 to match the matching annular portion of the sealing base 3, thereby reducing the path space, further extending the material entry path, and changing the path trajectory to make the path more tortuous, so as to make the blocking effect on the entry of materials more effective. Figure 2As shown, a gap is set between the matching annular groove 21 and the matching annular portion of the sealing base 3, and the gap is less than or equal to 0.5 mm. When the gap is greater than 0.5 mm, the tiny particle material, due to its tiny size, can easily enter between the inner shaft system 1 and the outer shaft system 2 along a tortuous path under the action of external force, thereby affecting the transmission structure between the inner shaft system 1 and the outer shaft system 2.

[0052] It should be noted that in this embodiment, the bottom of the collecting chamber 31 is the collecting bottom surface 32, and the depth of the collecting chamber 31 is greater than the depth of the sealing ring groove 33, that is, the collecting bottom surface 32 is lower than the bottom of the sealing ring groove 33 in the vertical direction, making it more difficult for impurities that enter between the inner shaft system 1 and the outer shaft system 2 and are collected in the collecting chamber 31 to overflow.

[0053] Furthermore, if Figure 3 As shown, the seal 4 is annular, arranged between the inner shaft system 1 and the outer shaft system 2, and fixedly installed with the outer shaft system 2. The seal 4 is provided with at least one group of cavities 42 on the side facing the inner shaft system 1, and a gap is set between the inner side surface of the seal 4 and the outer side surface of the inner shaft system 1, and the gap is 0.1 mm. The structure of the gap and the cavity 42 is coordinated so that when tiny impurities that enter between the inner shaft system 1 and the outer shaft system 2 through the first sealing structure pass through the gap between the inner side surface of the seal 4 and the outer side surface of the inner shaft system 1, the fluid resistance increases, and a greater air pressure is required to overcome these resistances, so that it is more difficult for tiny impurities to pass through the gap, and even if they pass through the gap, after entering the cavity 42, the flow rate will slow down, and it will be more difficult to pass through the next gap. Moreover, since the volume of the cavity 42 is relatively large, the interaction force between the tiny impurities is enhanced or mutual collision and extrusion will occur during the deceleration process, resulting in an increase in the pressure on the tiny impurities as a whole, further blocking the possibility of tiny impurities entering from the outside passing through the gap.

[0054] It should be noted that in this embodiment, in order to achieve a better sealing effect, the seal 4 is provided with multiple groups of cavities 42, and the multiple groups of cavities 42 are arranged in sequence along the vertical direction. Through the coordination of the multi-level gaps and the structure of the cavities 42, the difficulty of tiny impurities passing through is increased, thereby improving the sealing effect.

[0055] It should be noted that in this embodiment, a sealing groove is provided on the outer side of the seal 4, and a sealing ring 41 is provided in the sealing groove. The seal 4 cooperates with the inner side of the outer shaft system 2 through the sealing ring 41 to achieve sealing and positioning. A gap is set between the outer side of the seal 4 and the outer shaft system 2 for easy installation.

[0056] Embodiment 2

[0057] like Figure 4 and Figure 5 As shown, based on the first embodiment, the present embodiment improves the structures of the sealing base 3 and the sealing member 4 to enhance the sealing effect and adapt to different working environments.

[0058] Specific as Figure 4 As shown, the difference between the sealing base 3 in this embodiment and the embodiment 1 is that the collecting portion 34 is used to replace the collecting bottom surface 32 at the bottom of the collecting chamber 31 of the sealing base 3, wherein the collecting portion 34 includes a material guiding slope 1 341 close to the inner shaft system 1, and a material collecting bin 342 is arranged at the other end of the material guiding slope 1 341, and a blocking portion 343 is arranged at the other end of the material collecting bin 342, and a material guiding slope 2 344 is arranged at the other end of the blocking portion 343, and the material guiding slope 2 344 is connected to the side wall of the collecting chamber 31 and is inverted with a rounded transition, and the material guiding slope 1 341 is arranged downwardly from the transfer hole to the material collecting bin 342, and the material guiding slope 2 344 is arranged upwardly from the blocking portion 343 to the side wall of the collecting chamber 31, wherein the material collecting bin 342 is located below the blocking portion 343, and the blocking portion 343 has a certain blocking effect on the vertical direction of the material collecting bin 342.

[0059] The other structures of the sealing base 3 in this embodiment are consistent with those in the first embodiment.

[0060] In this embodiment, the collecting portion 34 is provided to stably collect the tiny impurities passing through the first seal, and the tiny impurities entering are made to slide into the collecting bin 342 through the material guiding slope 1 341 and the material guiding slope 2 344, and the collecting bin 342 is semi-hidden (such as Figure 4 As shown in the figure, the effective collision between the impurities entering later and the impurities entering earlier is reduced, the kinetic energy of the impurities is reduced, and the deposited impurities are avoided from being knocked up, thereby accelerating the diffusion of the impurities to the second seal; and the second seal blocks the falling new impurities (powder particles entering the gap between the seal 4 and the inner shaft system 1 are easily deformed by friction, causing the raw materials to become impurities or debris caused by friction of the transmission mechanism), which will slide into the collection bin 342, and the ability to diffuse to the outside is weakened, and when the external air pressure change decreases, the impurities in the internal collection bin 342 are blocked by the blocking part 343, making it more difficult to penetrate outward, thereby improving the overall sealing performance and being more adaptable to different internal and external pressure change environments.

[0061] In addition, the collection bin 342 in this embodiment penetrates deep into the sealing base 3, collects more impurities, and combined with regular cleaning, solves the reverse infiltration phenomenon caused by impurity accumulation. The blocking part 343 blocks the collection bin 342 in the vertical direction, making the impurity infiltration path inward, making it more difficult to infiltrate outward.

[0062] Specific as Figure 4 and Figure 5 As shown, the difference between the seal 4 in this embodiment and the embodiment 1 is that a retaining ring 43 is provided on the outer side of the seal 4 in this embodiment, and the retaining ring 43 includes two copper half rings, which are clamped from the side in the installation groove opened on the outer side of the seal 4, wherein the outer side diameter of the retaining ring 43 is consistent with the diameter of the fitting surface of the outer shaft system 2 and the seal 4.

[0063] The other structures of the sealing member 4 in this embodiment are consistent with those in the first embodiment.

[0064] In this embodiment, a copper retaining ring 43 that fits with the outer shaft system 2 is provided on the outer side surface of the seal 4 to accurately position the seal 4, so that the seal 4 can transitionally fit with the inside of the outer shaft system 2 during the assembly process, thereby avoiding a slight positional offset or deflection of the seal 4 due to the elasticity of the sealing ring 41 during the assembly process, making the installation of the inner shaft system 1 more convenient (when the seal 4 is slightly offset or deflected, since the gap between the seal 4 and the inner shaft system 1 is also very small, the inner shaft system 1 is likely to produce friction or interference with the seal 4 during installation, resulting in poor installation of the inner shaft system 1 and easy damage), and the gap between the inner shaft system 1 and the inner side surface of the seal 4 is more uniform, so that the sealing effect is more uniform and sufficient (when the gap is uneven, it will inevitably lead to a smaller gap on one side and a larger gap on the other side. The larger gap will inevitably lead to poor sealing effect, while the smaller gap will easily produce friction and damage the inner shaft system 1).

[0065] In this embodiment, the retaining ring 43 is made of copper. Since copper is relatively soft, it is not easy to damage the outer shaft system 2 when it is in transition matching and friction with the inner wall of the outer shaft system 2. In addition, the damaged retaining ring 43 is easy to replace and the cost is lower.

[0066] Furthermore, the retaining ring 43 in this embodiment connects the seal 4 to the outer shaft system 2, so that the heat of the inner shaft system 1 and the seal 4 can be quickly transferred to the outer shaft system 2, thereby extending the service life of the inner shaft system 1 and the seal 4.

[0067] The copper clamping ring 43 is used to dissipate heat from the seal 4 on the one hand, and to precisely limit the position of the seal 4 on the other hand.

[0068] It should be further explained that the number and position of the snap ring 43 in this embodiment are not specifically limited; Figure 4 As shown), it can also be two snap rings 43 (as shown Figure 5 As shown), the snap ring 43 may or may not be in contact with the sealing ring 41. In the present application, the snap ring 43 is preferably arranged in the middle of the sealing member 4 to make the limiting more stable.

[0069] Embodiment 3

[0070] like Figure 6-Figure 8 As shown, this embodiment provides a stirring mechanism, which includes a rotating shaft 5, a rotating sleeve 6 is sleeved on the outer side of the rotating shaft 5, a fixed sleeve 7 is sleeved on the outer side of the rotating sleeve 6, a first sealing mechanism 8 is arranged between the rotating shaft 5 and the rotating sleeve 6, and a second sealing mechanism 9 is arranged between the rotating sleeve 6 and the fixed sleeve 7.

[0071] The first sealing mechanism 8 and the second sealing mechanism 9 adopt the multi-axis rotary sealing mechanism in embodiment one or embodiment two. In this embodiment, when the rotating shaft 5 cooperates with the rotating sleeve 6, the rotating shaft 5 is the inner shaft system 1 and the rotating sleeve 6 is the outer shaft system 2. When the rotating sleeve 6 cooperates with the fixed sleeve 7, the rotating sleeve 6 is the inner shaft system 1 and the fixed sleeve 7 is the outer shaft system 2.

[0072] The first sealing mechanism 8 is applied between the rotating shaft 5 and the rotating sleeve 6, and cooperates with the rotating shaft 5 and the rotating sleeve 6 to achieve a sealing effect. The second sealing mechanism 9 is applied between the rotating sleeve 6 and the fixed sleeve 7, and cooperates with the rotating sleeve 6 and the fixed sleeve 7 to achieve a sealing effect.

[0073] Furthermore, a transmission gear 51 is provided on the top of the rotating shaft 5 and is connected to an external driving device to drive the rotating shaft 5 to rotate. A conveying auger 52 is connected to the bottom of the rotating shaft 5 to realize the conveying function.

[0074] Furthermore, the rotating sleeve 6 is sleeved on the outside of the rotating shaft 5, and two groups of bearings 61 are arranged inside the upper end of the rotating sleeve 6, a separation limit sleeve 62 is arranged between the two groups of bearings 61, a gasket 63 is arranged opposite to the bearing 61 at the bottom, the gasket 63 cooperates with the step surface opened inside the rotating sleeve 6, the rotating shaft 5 passes through the two groups of bearings 61, a plurality of oil seals 64 are arranged inside the lower end of the rotating sleeve 6, and the plurality of oil seals 64 are separated by gaskets 63, and the oil seal 64 located at the lowest end is also separated from the seal 4 in the first sealing mechanism 8 by the gasket 63, the lower end of the rotating sleeve 6 cooperates with the sealing base 3 in the first sealing mechanism 8, a stirring rod 65 is connected to the outer side of the bottom end of the rotating sleeve 6 for stirring the material, and a transmission gear sleeve 66 is also arranged on the outer side of the upper end of the rotating sleeve 6 for connecting with an external driving device, thereby driving the rotating sleeve 6 to rotate.

[0075] Furthermore, the above-mentioned fixed sleeve 7 is sleeved on the outside of the rotating sleeve 6, two sets of bearings 71 are arranged inside the upper end of the fixed sleeve 7, the rotating sleeve 6 is arranged through the two sets of bearings 71, and an oil seal 72 is arranged inside the lower end of the fixed sleeve 7. The oil seal 72 is in contact with the seal 4 of the second sealing mechanism 9, and the lower end of the fixed sleeve 7 cooperates with the sealing base 3 of the second sealing mechanism 9.

[0076] By setting the bearing 1 61 and the bearing 2 71, the rotating sleeve 6 is rotatably set inside the fixed sleeve 7, and the rotating shaft 5 is rotatably set inside the rotating sleeve 6, thereby realizing multi-axis movement, and stirring and conveying do not interfere with each other.

[0077] Embodiment 4

[0078] like Figure 9-12As shown, this embodiment provides a spiral metering silo, which uses the stirring mechanism in the third embodiment, and includes a base 106, a mounting frame 107 is arranged on the top of the base 106, and a driving member 102 and a driving member 2 104 are installed on the mounting frame 107, wherein the driving member 102 is connected to the transmission gear 51 through a synchronous belt 101, and the driving member 2 104 is connected to the transmission gear sleeve 66 through a synchronous belt 2 103;

[0079] Specifically, driving member 102 drives the rotating shaft 5 to rotate, and then drives the conveying auger 52 to rotate for conveying, and driving member 2 104 drives the rotating sleeve 6 to rotate, and then drives the stirring rod 65 to rotate for stirring, and driving member 102 and driving member 2 104 are mechanisms that can provide driving force, including but not limited to rotating cylinders, motors, etc.

[0080] Furthermore, a silo 105 is provided outside the stirring mechanism, a cover plate is provided on the top of the silo 105, a fixed sleeve 7 is fixed on the cover plate, the stirring rod 65 is located in the silo 105, and a conveying pipe 108 is connected to the bottom of the silo 105, and a conveying auger 52 is located in the conveying pipe 108 to realize conveying.

[0081] Furthermore, a sealing shell 109 is provided on the top of the mounting frame 107 for protecting the driving member 102 and the driving member 2 104, and a plurality of feed ports 110 are provided on the cover plate for feeding.

[0082] The spiral metering silo in this embodiment is provided with the multi-axis rotary sealing mechanism of the first or second embodiment. In special processing fields with extremely high requirements for impurity control, such as pharmaceutical processing, it can be fully sealed to prevent chips generated by friction during the operation of the transmission structure from entering the material, and also to prevent powder contaminated by mechanical parts from accumulating to a certain extent and reversely permeating back into the silo to directly contaminate the pharmaceutical raw materials to be processed.

[0083] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation, and therefore, cannot be understood as a limitation on the present invention. In addition, "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0084] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0085] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A multi-axis rotary sealing mechanism, characterized in that: It is used between the inner shaft system (1) and the outer shaft system (2), and cooperates with the inner shaft system (1) and the outer shaft system (2) to achieve sealing, and the outer shaft system (2) is sleeved on the outside of the inner shaft system (1); The multi-shaft rotary sealing mechanism comprises a sealing base (3) and at least one sealing element (4); The sealing base (3) is installed on the inner shaft system (1), and the sealing base (3) cooperates with the corresponding end of the outer shaft system (2) to form a first sealing structure; The sealing member (4) is installed on the outer shaft system (2), and the sealing member (4) cooperates with the corresponding surface of the inner shaft system (1) to form a second sealing structure.

2. A multi-shaft rotary sealing mechanism according to claim 1, characterized in that: The sealing base (3) is provided with a collecting chamber (31) on the side facing the outer shaft system (2), and a through assembly hole is provided at the center of the bottom surface of the collecting chamber (31), and the assembly hole is threadedly connected to the inner shaft system (1).

3. A multi-shaft rotary sealing mechanism according to claim 2, characterized in that: At least one sealing ring groove (33) is provided on the outer wall of the collecting chamber (31), and the sealing ring groove (33) divides the outer wall of the collecting chamber (31) into a plurality of coaxially arranged matching annular portions, and the depth of the collecting chamber (31) is greater than the depth of the sealing ring groove (33).

4. A multi-shaft rotary sealing mechanism according to claim 3, characterized in that: The mating end surfaces of the outer shaft system (2) and the sealing base (3) are provided with a mating annular groove (21) mating with the mating annular portion, and the mating annular groove (21) and the mating annular portion are loosely matched, and the mating clearance is ≤0.5 mm.

5. A multi-shaft rotary sealing mechanism according to claim 4, characterized in that: A collecting portion (34) is provided at the bottom of the collecting chamber (31), and the collecting portion (34) comprises a material guiding slope 1 (341) close to the inner shaft system (1), a material collecting bin (342) is provided at the other end of the material guiding slope 1 (341), a blocking portion (343) is provided at the other end of the material collecting bin (342), and a material guiding slope 2 (344) is provided at the other end of the blocking portion (343), and the material guiding slope 2 (344) is connected to the side wall of the collecting chamber (31).

6. The multi-shaft rotary sealing mechanism according to claim 1, characterized in that: The sealing member (4) is annular and has at least one group of cavities (42) formed on the side of the sealing member (4) facing the inner shaft system (1). The inner side surface of the sealing member (4) is clearance-matched with the outer side surface of the inner shaft system (1).

7. A multi-shaft rotary sealing mechanism according to claim 6, characterized in that: The matching clearance between the sealing element (4) and the inner shaft system (1) is 0.1 mm.

8. The multi-shaft rotary sealing mechanism according to claim 7, characterized in that: At least one group of snap rings (43) is arranged on the outer side surface of the sealing member (4), and the snap rings (43) include two half rings, and the half rings are arranged in close contact with the outer shaft system (2).

9. A stirring mechanism, characterized in that: The invention comprises a rotating shaft (5), a rotating shaft sleeve (6) is sleeved on the outer side of the rotating shaft (5), a fixed shaft sleeve (7) is sleeved on the outer side of the rotating shaft sleeve (6), a first sealing mechanism (8) is arranged between the rotating shaft (5) and the rotating shaft sleeve (6), and a second sealing mechanism (9) is arranged between the rotating shaft sleeve (6) and the fixed shaft sleeve (7); The first sealing mechanism (8) and / or the second sealing mechanism (9) adopts the multi-axis rotary sealing mechanism according to any one of claims 1 to 8.

10. A spiral metering silo, characterized in that: The stirring mechanism comprises the stirring mechanism and the base (106) as claimed in claim 9, wherein a mounting frame (107) is arranged on the top of the base (106), a driving member 1 (102) and a driving member 2 (104) are mounted on the mounting frame (107), and the driving member 1 (102) and the driving member 2 (104) are respectively connected to the rotating shaft (5) and the rotating sleeve (6); It also comprises a silo (105), the bottom of which is connected to a delivery pipe (108), and the stirring mechanism is extended into the silo (105).

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