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

Abstract

The utility model 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 utility model relates to multi -shaft system sealing technical field, concretely relates to a kind of multi -shaft system rotary sealing mechanism, stirring mechanism and spiral metering bin. BACKGROUND

[0002] Spiral metering bin as a kind of advanced equipment integrating feeding, metering and storage function in one, in material handling field, especially in the processing of granular and powdery material, has shown significant advantages and extensive application prospect.Spiral metering bin realizes the efficient, accurate metering and stable storage of material by accurately controlled spiral conveying mechanism, greatly improves production efficiency and the convenience of material management.

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

[0004] Pharmaceutical processing industry, especially powder injection products directly injected into the human body, has almost strict requirements on the cleanliness of production environment and the purity of material.The application of spiral metering bin in pharmaceutical processing first faces the problem of debris impurities generated by friction during the operation of 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 drug, they may not only affect the effectiveness of the drug, but also may cause unpredictable health risks and even life-threatening risks to patients after use.

[0005] In addition, the powder particles used in pharmaceutical processing are usually extremely small, and these tiny particles have strong penetration ability, which may penetrate the tiny gap of the traditional sealing ring and invade the internal transmission structure of the bin.This not only may cause blockage and wear of mechanical parts such as bearings, affecting the normal operation of the equipment and maintenance cost, but more seriously, once these powder contaminated by mechanical parts accumulate to a certain extent, they may penetrate back into the bin, directly contaminating the raw materials for processing, forming a vicious cycle, and seriously damaging the overall quality and safety of the drug.

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

[0007] The purpose of this utility model is to provide a multi-axis rotary sealing mechanism, a stirring mechanism, and a spiral metering hopper. By setting a multi-axis rotary sealing mechanism in the spiral metering hopper, sufficient sealing is achieved, which solves the problem of dust generated by friction during the operation of the transmission structure entering the material and the problem of powder contaminated by mechanical parts accumulating to a certain extent and then seeping back into the hopper, directly contaminating the raw materials to be processed.

[0008] The objective of this utility model can be achieved through the following technical solutions:

[0009] A multi-shaft 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 outside of the inner shaft system;

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

[0011] The sealing base is installed on the inner shaft system, and the sealing base and the corresponding ends of the outer shaft system cooperate to form the first sealing structure;

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

[0013] As a further embodiment of this utility model: the sealing base has a collection cavity on the side facing the outer shaft system, and a through assembly hole is formed at the center of the bottom surface of the collection cavity, which is threadedly connected to the inner shaft system.

[0014] As a further aspect of this invention, the depth of the collecting cavity is greater than the depth of the sealing ring groove.

[0015] As a further embodiment of this utility model: at least one sealing ring groove is provided on the outer wall of the collecting cavity, and the sealing ring groove divides the outer wall of the collecting cavity into a plurality of concentrically arranged mating annular portions.

[0016] As a further embodiment of this utility model: the outer shaft system and the sealing base have a mating annular groove on their mating end face that mates with the mating annular portion.

[0017] As a further embodiment of this utility model: the mating annular groove and the mating annular portion are in clearance fit, and the clearance is ≤0.5mm.

[0018] As a further scheme of the utility model: the collecting cavity bottom is provided with a collecting part, the collecting part includes a material guiding slope one close to the inner shaft system, the other end of the material guiding slope one is provided with a material collecting bin, the other end of the material collecting bin is provided with a blocking part, the other end of the blocking part is provided with a material guiding slope two, and the material guiding slope two is connected with the side wall of the collecting cavity.

[0019] As a further scheme of the utility model: the sealing piece is annular, at least one group of cavities are formed in the side surface of the sealing piece towards the inner shaft system, and the inner side surface of the sealing piece is in clearance fit with the outer side surface of the inner shaft system.

[0020] As a further scheme of the utility model: the clearance fit between the sealing piece and the inner shaft system is 0.1mm.

[0021] As a further scheme of the utility model: the outer side surface of the sealing piece is provided with at least one group of clamping rings, the clamping ring includes two half rings, and the half rings are arranged in adhesion with the outer shaft system.

[0022] As a further scheme of the utility model: the material of the half ring is copper.

[0023] As a further scheme of the utility model: a stirring mechanism, including a rotating shaft, the outer side of the rotating shaft is provided with a rotating shaft sleeve, the outer side of the rotating shaft sleeve is provided with a fixed shaft sleeve, a first sealing mechanism is arranged between the rotating shaft and the rotating shaft sleeve, and a second sealing mechanism is arranged between the rotating shaft sleeve and the fixed shaft sleeve.

[0024] The first sealing mechanism and / or the second sealing mechanism adopt the multi-shaft system rotary sealing mechanism.

[0025] As a further scheme of the utility model: a spiral metering bin, including the above-mentioned stirring mechanism and base, the top of the base is provided with a mounting frame, the mounting frame is provided with a driving part one and a driving part two, the driving part one and the driving part two are respectively in transmission connection with the rotating shaft and the rotating shaft sleeve.

[0026] Further including a bin, the bottom of the bin is connected with a conveying pipe, and the stirring mechanism extends into the bin.

[0027] The utility model has the advantages of:

[0028] The utility model discloses a first sealing structure and second sealing structure are set up to the full sealing between inner shaft system and outer shaft system, wherein the first sealing structure is matched with outer shaft system through sealing base, and the path space of tiny particle is reduced, and the entering path is further lengthened, and the path trajectory is changed, so that the blocking effect of the tiny particle is more sufficient, and the second sealing structure is matched with the structure of gap and cavity, so that the tiny impurity between inner shaft system and outer shaft system through the first sealing structure increases fluid resistance when passing the gap between the inboard surface of sealing element and the outboard surface of inner shaft system, needs greater air pressure to overcome these resistances, then the tiny impurity is more difficult through the gap, and even if through the gap, after entering the cavity, the flow rate will slow down, and it is more difficult to pass the next gap, and because the volume of cavity is relatively large, the interaction force between tiny impurities is enhanced or the mutual collision and extrusion in the deceleration process, so that the pressure of the whole tiny impurity increases, and the possibility of the tiny impurity of outside entering through the gap is further blocked.

[0029] The utility model discloses a multi-axle system rotary sealing mechanism is set up in spiral metering bin, in the special processing field of extremely high impurity control requirement, such as medicine processing, can be fully sealed, prevent the chip of the friction of transmission structure operation process to enter the material, also avoid the powder of being contaminated by mechanical parts to accumulate to a certain degree, reverse osmosis back to the inside of bin, directly pollute the medicine raw material of being processed. ACCURACY

[0030] The utility model makes further explanation in combination with the drawings.

[0031] Figure 1 It is structure schematic diagram of the utility model embodiment one;

[0032] Figure 2 It is Figure 1 It is structure schematic diagram of A area in the enlargement of;

[0033] Figure 3 It is Figure 1 It is structure schematic diagram of B area in the enlargement of;

[0034] Figure 4 It is structure schematic diagram of the utility model embodiment two;

[0035] Figure 5 It is one structure schematic diagram of sealing element in the utility model embodiment two;

[0036] Figure 6 It is cross section structure schematic diagram of the utility model embodiment three adopts the multi-axle system rotary sealing mechanism of embodiment one;

[0037] Figure 7is a cross-sectional structure schematic view of the multi-shaft system rotary sealing mechanism of the embodiment two adopted in the embodiment three of the utility model;

[0038] Figure 8 is a structure schematic view of the utility model embodiment three;

[0039] Figure 9 is a structure schematic view of the utility model embodiment four Figure 1 ;

[0040] Figure 10 is a structure schematic view of the utility model embodiment four Figure 2 ;

[0041] Figure 11 is a structure schematic view of the utility model embodiment four Figure 3 ;

[0042] Figure 12 is a structure schematic view of the utility model embodiment four Figure 4 .

[0043] In the drawing: 1, inner shaft system;2, outer shaft system;21, matching ring groove;3, sealing base;31, collection cavity;32, collection bottom surface;33, sealing ring groove;34, collection part;341, first material guide slope;342, material collection bin;343, blocking part;344, second material guide slope;4, sealing piece;41, sealing ring;42, cavity;43, snap ring;5, rotating shaft;51, transmission gear;52, conveying auger;6, rotating shaft sleeve;61, bearing one;62, separation limiting sleeve;63, gasket ring;64, oil seal one;65, stirring rod;66, transmission gear sleeve;7, fixed shaft sleeve;71, bearing two;72, oil seal two;8, first sealing mechanism;9, second sealing mechanism;101, synchronous belt one;102, driving piece one;103, synchronous belt two;104, driving piece two;105, material bin;106, base;107, mounting frame;108, conveying pipe;109, sealing shell;110, feeding port. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0045] Embodiment one

[0046] As Figures 1-3As shown, the embodiment provides a multi-shaft system rotary sealing mechanism, which is applied 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 realize the sealing effect. The 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 cooperates with the corresponding end of the outer shaft system 2 to form the first sealing structure. The sealing element 4 is installed inside the outer shaft system 2 and cooperates with the outer side of the inner shaft system 1 to form the second sealing structure. The inner shaft system 1 and the outer shaft system 2 are fully sealed through the two sealing structures.

[0047] It should be noted that the outer shaft system 2 is sleeved on the outer side of the inner shaft system 1. The structures of the inner shaft system 1 and the outer shaft system 2 are not limited, for example, the inner shaft system 1 can be a central transmission shaft structure or a shaft sleeve structure sleeved on the outer side of the central transmission shaft. The outer shaft system 2 can be a shaft sleeve structure sleeved on the outer side of the inner shaft system 1 and adjacent to the inner shaft system 1.

[0048] Further as shown, Figure 2 The sealing base 3 is provided with a collecting cavity 31 in the center of the side facing the end of the outer shaft system 2. A through sealing base 3 assembly hole is formed in the bottom surface center of the collecting cavity 31. The sealing base 3 is fixedly installed on the inner shaft system 1 through the assembly hole. After installation, the sealing base 3 is coaxially arranged with the inner shaft system 1.

[0049] Further, in order to facilitate the installation and removal of the sealing base 3, the sealing base 3 can be regularly cleaned or replaced, thereby avoiding the entry of small particles from the outside into the space between the inner shaft system 1 and the outer shaft system 2, forming impurities, causing accumulation, and permeating pollutants in the opposite direction. The sealing base 3 of the embodiment is threadedly connected with the inner shaft system 1. When cleaning and replacement are required, the sealing base 3 can be easily removed without damaging the inner shaft system 1, thereby saving part costs.

[0050] Further, at least one sealing ring groove 33 is formed in the middle of the outer side wall of the collecting cavity 31 of the sealing base 3 in the embodiment. The sealing ring groove 33 divides the outer side wall of the collecting cavity 31 into a plurality of cooperating annular portions arranged concentrically inside and outside. The plurality of cooperating annular portions cooperate with the corresponding cooperating end surface of the outer shaft system 2 to form a seal. By lengthening the path of the small particles (such as powder) from the outside into the space between the inner shaft system 1 and the outer shaft system 2, the entry of the material is made more difficult, thereby achieving a certain sealing effect.

[0051] Further, in order to make the first sealing effect more sufficient, without increasing the diameter of the sealing base 3, a cooperating ring groove 21 is formed in the cooperating end surface of the outer shaft system 2, which cooperates with the cooperating annular portion of the sealing base 3. The path space is reduced, the material entry path is further lengthened, the path trajectory is changed, the path is more bent, the blocking effect of the material entry is more sufficient, and specific as Figure 2As shown, and the cooperation ring groove 21 and the cooperation ring gap of the sealing base 3 is set, the gap is less than or equal to 0.5mm, when the gap is greater than 0.5mm, the small particle material is easy to enter between the inner shaft system 1 and the outer shaft system 2 along the bending path under the action of external force, which affects the transmission structure between the inner shaft system 1 and the outer shaft system 2.

[0052] It needs to be explained in this embodiment that the bottom of the collection cavity 31 is the collection bottom surface 32, and the depth of the collection cavity 31 is greater than the depth of the sealing ring groove 33, that is, the collection bottom surface 32 is lower than the groove bottom of the sealing ring groove 33 in the vertical direction, so that it is more difficult for the impurities entering between the inner shaft system 1 and the outer shaft system 2 and collected in the collection cavity 31 to overflow.

[0053] Further, as shown in the drawings, Figure 3 The sealing member 4 is annular, is arranged between the inner shaft system 1 and the outer shaft system 2, and is fixedly installed with the outer shaft system 2. At least one group of cavities 42 are formed in the side surface of the sealing member 4 facing the inner shaft system 1, and the inner side surface of the sealing member 4 is arranged in a gap with the outer side surface of the inner shaft system 1, and the gap is 0.1mm. Through the structural cooperation of the gap and the cavity 42, the fluid resistance of the small impurities entering between the inner shaft system 1 and the outer shaft system 2 through the first sealing structure is increased when passing through the gap between the inner side surface of the sealing member 4 and the outer side surface of the inner shaft system 1, and a greater air pressure is required to overcome these resistances, so that it is more difficult for the small impurities to pass through the gap. Even if the small impurities pass through the gap, the flow rate will slow down when entering the cavity 42, making it more difficult to pass through the next gap. Moreover, due to the relatively large volume of the cavity 42, the interaction force between the small impurities is enhanced or the mutual collision and extrusion occurs during the deceleration process, resulting in an increase in the overall pressure of the small impurities, which further blocks the possibility of the small impurities entering from the outside through the gap.

[0054] It needs to be explained in this embodiment that in order to achieve better sealing effect, the sealing member 4 is provided with a plurality of groups of cavities 42, which are arranged in sequence along the vertical direction. Through the structural cooperation of the multi-stage gap and the cavity 42, the difficulty of passing through is improved, and the sealing effect is improved.

[0055] It needs to be explained in this embodiment that the outer side surface of the sealing member 4 is provided with a sealing groove, and a sealing ring 41 is arranged in the sealing groove. The sealing member 4 is positioned and sealed with the inner side surface of the outer shaft system 2 through the sealing ring 41. The gap between the outer side surface of the sealing member 4 and the outer shaft system 2 is arranged to facilitate installation.

[0056] Embodiment two

[0057] As shown in the drawings, Figure 4 and Figure 5 On the basis of the first embodiment, the structure of the sealing base 3 and the sealing member 4 is improved to improve the sealing effect and adapt to different working environments.

[0058] Specifically as Figure 4 The difference between the sealing base 3 in the embodiment and the sealing base 3 in the first embodiment is that the collection cavity 31 in the sealing base 3 in the embodiment is replaced by a collection part 34, wherein the collection part 34 comprises a guide slope one 341 close to the inner shaft system 1, the guide slope one 341 is provided with a collection bin 342 at the other end, the collection bin 342 is provided with a blocking part 343 at the other end, and the blocking part 343 is provided with a guide slope two 344 at the other end, the guide slope two 344 is connected with the side wall of the collection cavity 31 and is provided with a round corner transition, the guide slope one 341 is provided in a downward slope from the transition hole to the collection bin 342, the guide slope two 344 is provided in an upward slope from the blocking part 343 to the side wall of the collection cavity 31, the collection bin 342 is located below the blocking part 343, and the blocking part 343 has a certain blocking effect on the vertical direction of the collection bin 342.

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

[0060] The collection part 34 in the embodiment is used to stably collect the small impurities passing through the first sealing, the guide slope one 341 and the guide slope two 344 are used to make the entering small impurities slide into the collection bin 342, the collection bin 342 is semi-hidden (as shown in Figure 4 The collection bin 342 is semi-hidden (as shown in

[0061] The collection bin 342 in the embodiment is deep into the inside of the sealing base 3, the amount of collected impurities is more, and the reverse penetration phenomenon caused by the accumulation of impurities is solved by regular cleaning, and the blocking part 343 blocks the vertical direction of the collection bin 342, so that the direction of the outward penetration path of the impurities is inward, and it is more difficult for the impurities to penetrate outward.

[0062] Specifically as Figure 4 and Figure 5 The difference between the sealing part 4 in the embodiment and the sealing part 4 in the first embodiment is that the sealing part 4 in the embodiment is provided with a snap ring 43 on the outside, the snap ring 43 comprises two copper half rings, and the snap ring 43 is clamped in the installation groove on the outside of the sealing part 4 from the side, wherein the diameter of the outside of the snap ring 43 is consistent with the diameter of the contact surface between the outer shaft system 2 and the sealing part 4.

[0063] The other structure of the sealing member 4 in the embodiment is consistent with that in Embodiment 1.

[0064] In the embodiment, the copper snap ring 43 is arranged on the outer side of the sealing member 4 and is in contact with the outer shaft system 2, so that the sealing member 4 is accurately positioned, the sealing member 4 is in transition fit with the inner part of the outer shaft system 2 during assembly, and then the slight position deviation or deflection of the sealing member 4 caused by the elasticity of the sealing ring 41 during assembly is avoided, the inner shaft system 1 is more convenient to install (when the sealing member 4 has slight deviation or deflection, the inner shaft system 1 is prone to friction or interference with the sealing member 4 due to the small gap between the sealing member 4 and the inner shaft system 1, which leads to poor installation of the inner shaft system 1 and is prone to damage), and the gap between the inner shaft system 1 and the inner side of the sealing member 4 is more uniform, and then the sealing effect is more uniform and sufficient (when the gap is not uniform, the sealing effect on the side with large gap is poor, and the side with small gap is prone to friction and damage to the inner shaft system 1).

[0065] In the embodiment, the copper material is used for the snap ring 43, and when the snap ring 43 is in transition fit and friction with the inner wall of the outer shaft system 2, the outer shaft system 2 is not easily damaged, and the damaged snap ring 43 is easy to replace and has low cost.

[0066] Further, the snap ring 43 in the embodiment connects the sealing member 4 and the outer shaft system 2, so that the heat of the inner shaft system 1 and the sealing member 4 can be quickly transferred to the outer shaft system 2, and the service life of the inner shaft system 1 and the sealing member 4 is prolonged.

[0067] The copper snap ring 43 can dissipate heat from the sealing member 4 and accurately position the sealing member 4.

[0068] It needs to be further explained that the number and position of the snap ring 43 in the embodiment are not limited, and the snap ring 43 can be one (as shown in Figure 4 ), or two (as shown in Figure 5 ), the snap ring 43 can be in contact with the sealing ring 41 or not, and in the application, the snap ring 43 is preferably arranged at the middle part of the sealing member 4 to make the positioning more stable.

[0069] Embodiment Three

[0070] As shown in Figures 6-8 , the embodiment provides a stirring mechanism, which comprises a rotating shaft 5, a rotating shaft sleeve 6 arranged outside the rotating shaft 5, a fixed shaft sleeve 7 arranged outside the rotating shaft sleeve 6, a first sealing mechanism 8 arranged between the rotating shaft 5 and the rotating shaft sleeve 6, and a second sealing mechanism 9 arranged between the rotating shaft sleeve 6 and the fixed shaft sleeve 7.

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

[0072] The first sealing mechanism 8 is applied between the rotary shaft 5 and the rotary shaft sleeve 6 and cooperates with the rotary shaft 5 and the rotary shaft sleeve 6 to realize the sealing effect; the second sealing mechanism 9 is applied between the rotary shaft sleeve 6 and the fixed shaft sleeve 7 and cooperates with the rotary shaft sleeve 6 and the fixed shaft sleeve 7 to realize the sealing effect.

[0073] Further, the top of the rotary shaft 5 is provided with a transmission gear 51 connected with the driving device outside to drive the rotary shaft 5 to rotate, and the bottom of the rotary shaft 5 is connected with a conveying auger 52 to realize the conveying function.

[0074] Further, the rotary shaft sleeve 6 is sleeved outside the rotary shaft 5, the upper end of the rotary shaft sleeve 6 is internally provided with two groups of bearings one 61, a separation limiting sleeve 62 is arranged between the two groups of bearings one 61, a gasket ring 63 is arranged opposite to the bearing one 61 at the bottom, the gasket ring 63 cooperates with the step surface formed in the rotary shaft sleeve 6, the rotary shaft 5 passes through the two groups of bearings one 61, a plurality of oil seals one 64 are arranged in the lower end of the rotary shaft sleeve 6, the plurality of oil seals one 64 are separated by the gasket ring 63, the oil seal one 64 at the lowermost end is also separated from the sealing element 4 in the first sealing mechanism 8 by the gasket ring 63, the lower end of the rotary shaft sleeve 6 cooperates with the sealing base 3 in the first sealing mechanism 8, a stirring rod 65 is connected to the outside of the bottom end of the rotary shaft sleeve 6 to stir the material, and a transmission gear sleeve 66 is arranged outside the upper end of the rotary shaft sleeve 6 to be connected with the driving device outside to drive the rotary shaft sleeve 6 to rotate.

[0075] Further, the above-mentioned fixed shaft sleeve 7 is sleeved outside the rotary shaft sleeve 6, the upper end of the fixed shaft sleeve 7 is internally provided with two groups of bearings two 71, the rotary shaft sleeve 6 passes through the two groups of bearings two 71, and an oil seal two 72 is arranged in the lower end of the fixed shaft sleeve 7, the oil seal two 72 contacts the sealing element 4 of the second sealing mechanism 9, and the lower end of the fixed shaft sleeve 7 cooperates with the sealing base 3 of the second sealing mechanism 9.

[0076] Through the bearings one 61 and the bearings two 71, the rotary shaft sleeve 6 is arranged to rotate inside the fixed shaft sleeve 7, and the rotary shaft 5 is arranged to rotate inside the rotary shaft sleeve 6, thereby realizing the multi-shaft system movement, and the stirring and the conveying do not interfere with each other.

[0077] Embodiment four

[0078] As Figures 9-12As shown, the embodiment provides a screw metering bin, which uses the stirring mechanism in embodiment three, and comprises a base 106, a mounting frame 107 is arranged on the top of the base 106, a driving part one 102 and a driving part two 104 are mounted on the mounting frame 107, wherein the driving part one 102 is in driving connection with the transmission gear 51 through a synchronous belt one 101, and the driving part two 104 is in driving connection with the transmission gear sleeve 66 through a synchronous belt two 103;

[0079] Specifically, the driving part one 102 drives the rotating shaft 5 to rotate, thereby driving the conveying auger 52 to rotate for conveying, the driving part two 104 drives the rotating shaft sleeve 6 to rotate, thereby driving the stirring rod 65 to rotate for stirring, and the driving part one 102 and the driving part two 104 are mechanisms capable of providing driving force, including but not limited to rotary air cylinders, motors and the like.

[0080] Further, a bin 105 is arranged outside the stirring mechanism, a cover plate is arranged on the top of the bin 105, a fixing shaft sleeve 7 is fixed on the cover plate, the stirring rod 65 is located in the bin 105, and a conveying pipe 108 is connected to the bottom of the bin 105, and the conveying auger 52 is located in the conveying pipe 108, so that conveying is realized.

[0081] Further, a sealing shell 109 is arranged on the top of the mounting frame 107, for protecting the driving part one 102 and the driving part two 104, and a plurality of feeding ports 110 are arranged on the cover plate, for feeding.

[0082] The screw metering bin in the embodiment is provided with the multi-shaft sealing mechanism in embodiment one or embodiment two, and in the special processing field with extremely high impurity control requirements, such as medicine processing, the screw metering bin can be fully sealed, so that the dust generated due to friction in the transmission structure during operation is prevented from entering the material, and the powder contaminated by mechanical parts is also prevented from accumulating to a certain degree and then reversely penetrating into the inside of the bin to directly contaminate the medicine raw materials to be processed.

[0083] In the description of the utility model, it is to be understood that the terms "upper", "lower", "left", "right" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements indicated must have a specific orientation, a specific orientation structure and operation, therefore, it cannot be understood as a limitation on the utility model. In addition, "first", "second" is only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0084] In the description of the utility model, it is necessary to explain, unless another explicit provision and limitation, the term "installation" "link" "connection" and so on should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, can also be electrical connection;Can be directly connected, also can pass through the indirect connection of intermediate medium, can be two elements inside the communication. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0085] The above one embodiment of the utility model has been described in detail, but the content described is only the preferred embodiment of the utility model, and cannot be considered to limit the implementation range of the utility model. Any equivalent change and improvement made within the scope of the utility model application shall still belong to the patent coverage range of the utility model.

Claims

1. A multi-axis rotary sealing mechanism, characterized in that, It is applied 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 a seal, wherein the outer shaft system (2) is sleeved on the outside of the inner shaft system (1); The multi-axis rotary sealing mechanism includes 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) and the corresponding ends of the outer shaft system (2) cooperate to form the first sealing structure; The seal (4) is installed on the outer shaft system (2), and the seal (4) and the corresponding surfaces of the inner shaft system (1) cooperate to form a second sealing structure.

2. The multi-axis rotary sealing mechanism according to claim 1, characterized in that, The sealing base (3) has a collection cavity (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 collection cavity (31), which is threadedly connected to the inner shaft system (1).

3. The multi-axis 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 collection cavity (31). The sealing ring groove (33) divides the outer wall of the collection cavity (31) into a plurality of concentrically arranged mating annular portions. The depth of the collection cavity (31) is greater than the depth of the sealing ring groove (33).

4. The multi-axis rotary sealing mechanism according to claim 3, characterized in that, The outer shaft system (2) and the sealing base (3) have a mating annular groove (21) that mates with the mating annular part. The mating annular groove (21) and the mating annular part are in clearance fit, and the clearance is ≤0.5mm.

5. A multi-axis rotary sealing mechanism according to claim 4, characterized in that, The bottom of the collection chamber (31) is provided with a collection part (34), which includes a first guide slope (341) near the inner shaft system (1), a collection bin (342) is provided at the other end of the first guide slope (341), a blocking part (343) is provided at the other end of the collection bin (342), and a second guide slope (344) is provided at the other end of the blocking part (343). The second guide slope (344) is connected to the side wall of the collection chamber (31).

6. A multi-axis rotary sealing mechanism according to claim 1, characterized in that, The seal (4) is annular, and at least one set of cavities (42) are provided on the side of the seal (4) facing the inner shaft system (1). The inner side of the seal (4) is clearance-fitted with the outer side of the inner shaft system (1).

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

8. A multi-axis rotary sealing mechanism according to claim 7, characterized in that, The outer side of the seal (4) is provided with at least one set of retaining rings (43), the retaining rings (43) including two half rings, the half rings being fitted to the outer shaft system (2).

9. A stirring mechanism, characterized in that, Includes a rotating shaft (5), a rotating bushing (6) is sleeved on the outside of the rotating shaft (5), a fixed bushing (7) is sleeved on the outside of the rotating bushing (6), a first sealing mechanism (8) is provided between the rotating shaft (5) and the rotating bushing (6), and a second sealing mechanism (9) is provided between the rotating bushing (6) and the fixed bushing (7). The first sealing mechanism (8) and / or the second sealing mechanism (9) adopts a multi-axis rotary sealing mechanism as described in any one of claims 1-8.

10. A spiral metering silo, characterized in that, Includes the stirring mechanism and base (106) as described in claim 9, wherein the base (106) is provided with a mounting bracket (107) on the top, and a first driving component (102) and a second driving component (104) are mounted on the mounting bracket (107), and the first driving component (102) and the second driving component (104) are respectively connected to the rotating shaft (5) and the rotating bushing (6) for transmission. It also includes a hopper (105), the bottom of which is connected to a conveying pipe (108), and the stirring mechanism extends into the hopper (105).

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