Fly cutter shaft sealing structure and mixing equipment

Abstract

The utility model relates to a fly-cutter shaft sealing structure and mixing equipment, the fly-cutter shaft sealing structure comprises a static ring, a moving ring and a fly-cutter shaft, the outer circumferential surface of the static ring is provided with a first sealing assembly, and the inner circumferential surface of the static ring is provided with a second sealing assembly; at least part of the moving ring is arranged outside the static ring in a sleeving mode, and the first sealing assembly is connected between the outer circumferential face of the static ring and the inner circumferential face of the moving ring in an abutting mode. The fly-cutter shaft is sequentially inserted into the static ring and the movable ring, and the second sealing assembly is connected between the inner circumferential face of the static ring and the outer circumferential face of the fly-cutter shaft in an abutting mode. According to the fly-cutter shaft sealing structure, through the first sealing assembly and the second sealing assembly, two barriers are arranged on the feeding path of materials, and the materials can be prevented from entering the fly-cutter assembly along fit clearances of all the parts; the total amount of powder materials entering the fly-cutter assembly is greatly reduced while it is guaranteed that the movable ring can rotate relative to the static ring, the materials are prevented from entering an oil seal and a bearing, normal work of the fly-cutter assembly is guaranteed, and the service life of the fly-cutter assembly is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of material mixing, and in particular to a flying cutter shaft sealing structure and a mixing device. Background Art

[0002] In existing mixing equipment such as a plowshare mixer, a flying knife assembly is usually used to shear and stir the materials in the inner cavity of the mixer barrel to prevent the materials from agglomerating and achieve uniform mixing of the materials.

[0003] The existing flying knife shaft sealing structure usually includes a bearing, an oil seal, a static ring and a dynamic ring which are sequentially sleeved on the flying knife shaft, wherein an air outlet gap is formed between the end faces of the static ring and the dynamic ring. In order to prevent the static ring and the dynamic ring from getting stuck due to a small air outlet gap, the air outlet gap needs to be increased and maintained within a certain size range. When the air outlet gap increases, the pressure in the air outlet gap decreases, and the powder material can easily overcome the gas pressure and enter the air outlet gap, and then enter the oil seal and the bearing through the air outlet gap, which will cause damage to the oil seal, powder ingress to the bearing, abnormal noise from the motor, and other problems, which will affect the normal operation of the flying knife assembly, and in severe cases, even affect the service life of the flying knife assembly, resulting in increased maintenance costs for the equipment. Utility Model Content

[0004] The present application provides a knife shaft sealing structure and a mixing device to solve the technical problem in the prior art that when the knife shaft sealing structure is sealed through the end faces of a static ring and a dynamic ring, the air outlet gap is too large and easily causes materials to enter the air outlet gap.

[0005] In a first aspect, the present application provides a flying cutter shaft sealing structure, comprising:

[0006] A stationary ring, wherein a first sealing assembly is disposed on an outer circumferential surface of the stationary ring and a second sealing assembly is disposed on an inner circumferential surface of the stationary ring;

[0007] A dynamic ring, at least a part of which is sleeved on the outside of the static ring, and a first sealing assembly is abutted between the outer circumference of the static ring and the inner circumference of the dynamic ring;

[0008] The flying cutter shaft is inserted in the stationary ring and the dynamic ring in sequence, and the second sealing component abuts between the inner circumference of the stationary ring and the outer circumference of the flying cutter shaft.

[0009] Optionally, the first sealing assembly and the second sealing assembly each include a plurality of sealing rings, and end surfaces of two adjacent sealing rings are arranged in abutment with each other.

[0010] Optionally, the stationary ring, the dynamic ring and the flying cutter shaft are connected to form a labyrinth gap having a plurality of bending portions, and the first sealing assembly is arranged at the front section of the labyrinth gap.

[0011] Optionally, the flying cutter shaft sealing structure also includes a flying cutter mounting seat, which is arranged around the outer circumference of the static ring. The flying cutter mounting seat has a first air inlet hole, and a second air inlet hole is provided on the side wall of the static ring. The first air inlet hole is connected to the second air inlet hole and the labyrinth gap in sequence.

[0012] Optionally, an air cavity is provided between the stationary ring and the flying cutter shaft, and the air cavity is communicated with the second air inlet hole and the labyrinth gap respectively.

[0013] Optionally, a third sealing assembly is provided on the outer circumferential surface of the stationary ring, and the third sealing assembly abuts between the outer circumferential surface of the stationary ring and the inner circumferential surface of the flying cutter mounting seat.

[0014] Optionally, the flying cutter shaft sealing structure further comprises a bearing seat, an oil seal is embedded in one end of the bearing seat close to the second sealing assembly, and a barrier is provided between the oil seal and the second sealing assembly.

[0015] Optionally, the diameter of the barrier is greater than the diameter of the second sealing assembly, and the inner circumferential surface of the stationary ring has a first limiting step surface matching the barrier and the second sealing assembly;

[0016] The diameter of the barrier is greater than the diameter of the oil seal, and the inner circumferential surface of the bearing seat has a second limiting step surface matching the stationary ring and the oil seal, and at least part of the second limiting step surface abuts against the end surface of the barrier.

[0017] Optionally, an elastic member is provided on a side of the oil seal away from the blocking member.

[0018] In a second aspect, the present application provides a mixing device, including the flying cutter shaft sealing structure provided in the first aspect of the present application.

[0019] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0020] The flying knife shaft sealing structure provided in the embodiment of the present application sets at least part of the moving ring on the outer circumference of the static ring, and a first sealing component is provided between the inner circumference of the moving ring and the outer circumference of the static ring. When the moving ring rotates relative to the static ring, the first sealing component will only produce a small deformation gap. Compared with the prior art, while ensuring that the moving ring can rotate relative to the static ring, the total amount of powder material entering the flying knife assembly can be greatly reduced. The second sealing component abuts between the inner circumference of the static ring and the outer circumference of the flying knife shaft, which can prevent a small amount of material passing through the deformation gap from further entering the oil seal and the bearing through the radial gap between the outer circumference of the flying knife shaft and the inner circumference of the static ring, which is conducive to ensuring the normal operation of the flying knife assembly, prolonging the service life of the flying knife assembly, and reducing the maintenance cost of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0023] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0024] Figure 1 A partial cross-sectional view of a mixing device provided in an embodiment of the present application;

[0025] Figure 2 A cross-sectional view of a flying cutter shaft sealing structure provided in an embodiment of the present application;

[0026] Figure 3 Provided in the embodiments of this application Figure 2 A magnified view of a local detail, wherein the dotted arrows indicate the feeding path of the material;

[0027] Figure 4 Provided in the embodiments of this application Figure 3 A magnified view of local details.

[0028] Description of reference numerals:

[0029] 1. static ring; 110. second air inlet; 120. third sealing assembly; 130. first limiting step surface; 131. first inclined surface; 140. second inclined surface;

[0030] 2. First sealing assembly; 210. First sealing ring;

[0031] 3. Second sealing assembly; 310. Second sealing ring;

[0032] 4. dynamic ring; 410. fourth sealing assembly;

[0033] 5. Flying knife shaft;

[0034] 6. Flying knife mounting seat; 610. First air inlet hole;

[0035] 7. bearing seat; 710. second limiting step surface;

[0036] 8. Oil seal;

[0037] 9. Barriers;

[0038] 10. Elastic parts;

[0039] 11. Driving motor;

[0040] 12. Motor flange;

[0041] 13. Bushing;

[0042] 14. Bearings;

[0043] 15. Locking nut;

[0044] 16. Lock washer. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0046] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0047] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0048] In order to solve the technical problem in the prior art that when the flying knife shaft sealing structure is sealed through the end faces of the static ring 1 and the dynamic ring 4, the air outlet gap is too large, which easily causes materials to enter the air outlet gap, the present application provides a flying knife shaft sealing structure and a mixing device, at least a part of the dynamic ring 4 is sleeved on the outer circumference of the static ring 1, and a first sealing component 2 is provided between the inner circumference of the dynamic ring 4 and the outer circumference of the static ring 1, which can greatly reduce the feed gap, and a second sealing component 3 is provided between the outer circumference of the flying knife shaft 5 and the inner circumference of the static ring 1, which can prevent materials from entering the oil seal 8 and the bearing 14, thereby avoiding affecting the normal operation and service life of the flying knife assembly.

[0049] See also Figures 1 to 4 In a first aspect, an embodiment of the present application provides a flying cutter shaft sealing structure, comprising a stationary ring 1, a dynamic ring 4 and a flying cutter shaft 5, wherein a first sealing component 2 is provided on the outer circumference of the stationary ring 1, and a second sealing component 3 is provided on the inner circumference of the stationary ring 1; at least a portion of the dynamic ring 4 is sleeved on the outside of the stationary ring 1, and the first sealing component 2 is abutted between the outer circumference of the stationary ring 1 and the inner circumference of the dynamic ring 4, such as Figure 2 and Figure 3As shown. In order to allow the moving ring 4 to rotate relative to the stationary ring 1 and avoid the flying knife assembly from getting stuck, there is a first radial gap between the outer circumference of the stationary ring 1 and the inner circumference of the moving ring 4. In order to prevent the material from entering the flying knife assembly along the first radial gap, the first sealing component 2 is abutted between the outer circumference of the stationary ring 1 and the inner circumference of the moving ring 4. When the moving ring 4 rotates relative to the stationary ring 1, the first sealing component 2 will only produce a small deformation gap, which can greatly reduce the total amount of powder material entering the flying knife assembly. Specifically, the deformation gap is only 0.05 to 0.15 times the first radial gap and / or the air outlet gap in the existing equipment. Compared with the prior art, while ensuring that the moving ring 4 can rotate relative to the stationary ring 1, the total amount of powder material entering the flying knife assembly can be greatly reduced.

[0050] The flying cutter shaft 5 is inserted in the stationary ring 1 and the dynamic ring 4 in sequence. In order to allow the flying cutter shaft 5 to rotate relative to the stationary ring 1, there is a second radial gap between the outer circumference of the flying cutter shaft 5 and the inner circumference of the stationary ring 1; the second sealing assembly 3 abuts between the inner circumference of the stationary ring 1 and the outer circumference of the flying cutter shaft 5, which can prevent a small amount of material passing through the deformation gap from further entering the oil seal 8 and the bearing 14 through the second radial gap.

[0051] It should be noted that, in the present application, by providing the first sealing component 2 and the second sealing component 3, Figure 3 Two barriers are set on the feeding path of the material shown, which can prevent the material from entering the inside of the flying cutter assembly along the matching gaps of the components. In order to facilitate the assembly of the first sealing component 2 and the second sealing component 3, it is preferred to set an annular groove for embedding the first sealing component 2 on the outer peripheral surface of the static ring 1, which is used to limit the first sealing component 2 and prevent the first sealing component 2 from shifting when the dynamic ring 4 rotates. The second sealing component 3 is first sleeved on the outer peripheral surface of the flying cutter shaft 5, and then matched with the static ring 1.

[0052] It should be noted that, in order to make the movable ring 4 and the flying knife shaft 5 rotate synchronously, the movable ring 4 and the flying knife shaft 5 are transition fit or interference fit, and a fourth sealing component 410 is provided between the outer circumference of the flying knife shaft 5 and the inner circumference of the movable ring 4 to prevent materials from entering the matching surface between the movable ring 4 and the flying knife shaft 5. Specifically, the fourth sealing component 410 includes at least one O-ring.

[0053] In some embodiments of this application, please refer to Figure 2 and Figure 3The first sealing assembly 2 and the second sealing assembly 3 each include a plurality of sealing rings, and the end faces of two adjacent sealing rings are arranged in abutment to form a continuous multi-stage seal, thereby enhancing the sealing effect of the first sealing assembly 2 and the second sealing assembly 3. In a specific embodiment of the present application, the first sealing assembly 2 includes two first sealing rings 210, and the second sealing assembly 3 includes three second sealing rings 310, and the reliability of the seal can be enhanced through multi-stage sealing.

[0054] It should be noted that the cross-sectional shape of the first sealing ring 210 and the second sealing ring 310 can be circular or rectangular. In some preferred embodiments of the present application, the cross-sectional shape of the first sealing ring 210 and the second sealing ring 310 is rectangular, which can reduce the gap between the end faces of adjacent sealing rings and avoid the accumulation of materials in the end face gaps of adjacent sealing rings.

[0055] In some embodiments of this application, please refer to Figure 3 The stationary ring 1, the dynamic ring 4 and the flying cutter shaft 5 are connected to form a labyrinth gap with multiple bending parts. The first sealing component 2 is arranged at the front section of the labyrinth gap, which can block the material from the front section of the material feeding path, thereby reducing the total amount of material entering the flying cutter component.

[0056] In some embodiments of this application, please refer to Figure 2 and Figure 3 The flying cutter shaft sealing structure also includes a flying cutter mounting seat 6, which is arranged around the outer circumference of the stationary ring 1. The flying cutter mounting seat 6 has a first air inlet hole 610. A second air inlet hole 110 is arranged on the side wall of the stationary ring 1. The first air inlet hole 610 is connected with the second air inlet hole 110 and the labyrinth gap in sequence. High-pressure compressed gas can be introduced into the second air inlet hole 110 and the labyrinth gap through the first air inlet hole 610 to form an airtight seal inside the labyrinth gap.

[0057] It should be noted that the air seal is formed at the front end of the second sealing component 3, which can further reduce the material moving to the second sealing component 3 along the feeding path.

[0058] In some embodiments of this application, please refer to Figure 3 There is an air cavity between the stationary ring 1 and the flying cutter shaft 5, and the air cavity is connected with the second air inlet 110 and the labyrinth gap respectively. A large amount of high-pressure gas is filled in the air cavity, and an air seal is also formed at the air cavity.

[0059] It should be noted that the air cavity is arranged at the front end of the second sealing component 3, which can also further reduce the material moving along the feeding path to the second sealing component 3. The air cavity has a second inclined surface 140 on one side close to the labyrinth gap, which reduces the area of ​​the gas flow cross section, increases the flow rate and pressure of the compressed gas, and enables the gas entering the labyrinth gap to achieve a better sealing effect.

[0060] In some embodiments of this application, please refer to Figure 2 The outer circumference of the stationary ring 1 is provided with a third sealing assembly 120, which abuts between the outer circumference of the stationary ring 1 and the inner circumference of the flying cutter mounting seat 6 to prevent high-pressure gas from leaking from the matching gap between the flying cutter mounting seat 6 and the stationary ring 1. Specifically, the third sealing assembly 120 includes at least one O-ring.

[0061] In some embodiments of this application, please refer to Figure 2 and Figure 3 The knife shaft sealing structure also includes a bearing seat 7, the interior of the bearing seat 7 is provided with a bearing 14 and a sleeve 13, and the knife shaft 5 is along the Figure 2 From left to right in the middle, it is inserted into the left bearing 14, the sleeve 13 and the right bearing 14 in sequence, wherein the inner ring of the bearing 14 cooperates with the flying knife shaft 5, and the outer ring of the bearing 14 cooperates with the bearing seat 7, so that the flying knife shaft 5 can rotate relative to the bearing seat 7.

[0062] An oil seal 8 is embedded in one end of the bearing seat 7 close to the second sealing assembly 3. The oil seal 8 is located between the bearing 14 and the second sealing assembly 3 to prevent the lubricating grease in the bearing 14 from flowing into the second sealing assembly 3, the air cavity, the labyrinth gap and the first sealing assembly 2.

[0063] A barrier 9 is provided between the oil seal 8 and the second sealing assembly 3 to prevent materials from moving from the deformation gap of the second sealing assembly 3 to the oil seal 8 and causing damage to the oil seal 8 .

[0064] It should be noted that in the prior art, the oil seal 8 is usually assembled inside the stationary ring 1, and the radial assembly tolerance of the oil seal 8 is affected by four components, namely, the fly cutter shaft 5, the bearing seat 7, the stationary ring 1, and the fly cutter mounting seat 6 sleeved outside the stationary ring 1. In the present application, the oil seal 8 is arranged in the bearing seat 7, so that the radial assembly tolerance of the oil seal 8 is not affected by the tolerance of the stationary ring 1, which facilitates the assembly of the oil seal 8 and improves the overall installation accuracy of the oil seal 8.

[0065] In some embodiments of this application, please refer to Figure 4 The diameter of the barrier member 9 is greater than the diameter of the second sealing assembly 3 , and the inner circumferential surface of the stationary ring 1 has a first limiting step surface 130 that matches the barrier member 9 and the second sealing assembly 3 , which can further enhance the barrier effect of the barrier member 9 on the material.

[0066] It should be noted that a first inclined surface 131 is provided on the side of the first limiting step surface 130 close to the air cavity. When the barrier 9 presses the second sealing assembly 3, the second sealing assembly 3 is elastically deformed to fill the cavity below the first inclined surface 131, thereby reducing the probability of material leakage to the oil seal 8 and ensuring the service life of the oil seal 8. Preferably, the angle between the first inclined surface 131 and the vertical direction is 10° to 30°, so that the end surface of the second sealing ring 310 in the second sealing assembly 3 is deformed and fits with the first inclined surface 131 to achieve sealing.

[0067] In some embodiments of this application, please refer to Figure 4 , the diameter of the barrier 9 is larger than the diameter of the oil seal 8, the inner circumference of the bearing seat 7 has a second limiting step surface 710 matching the stationary ring 1 and the oil seal 8, and at least part of the second limiting step surface 710 abuts against the end surface of the barrier 9. When the left end of the stationary ring 1 is embedded in the bearing seat 7, the end surfaces on both sides of the barrier 9 can be limited by the first limiting step surface 130 and the second limiting step surface 710, respectively, to ensure that the barrier 9 will not shift during use, and to ensure the barrier 9's blocking effect on materials.

[0068] In some preferred embodiments of the present application, the blocking member 9 is an annular pressure plate sleeved on the flying cutter shaft 5 .

[0069] In some embodiments of this application, please refer to Figure 2 and Figure 4 The side of the oil seal 8 away from the barrier 9 is provided with an elastic member 10, which can press the oil seal 8 against one end surface of the barrier 9 to enhance the sealing effect between the oil seal 8 and the barrier 9. Preferably, the elastic member 10 is a retaining spring embedded in the bearing seat 7, which can ensure the sealing effect between the oil seal 8 and the barrier 9 while ensuring that the bearing 14 and the flying cutter shaft 5 cannot move axially.

[0070] In some embodiments of this application, please refer to Figure 2 The fly cutter shaft 5 is also provided with a locking nut 15 and a stop washer 16 to prevent the fly cutter shaft 5 from axial movement.

[0071] In the above example, see Figure 2 and Figure 3 Along the material feeding path, the first sealing component 2, the labyrinth gap, the air seal, the second sealing component 3, the barrier 9 and the oil seal 8 form multiple barriers to the material, which can greatly reduce the total amount of material entering the gap of the flying cutter component, and avoid problems such as damage to the oil seal 8, powder inflow to the bearing 14, and abnormal noise from the motor. This is conducive to ensuring the normal operation of the flying cutter component, prolonging the service life of the flying cutter component, and reducing the maintenance cost of the equipment.

[0072] See also Figure 1In the second aspect of the present application, a mixing device is provided, including the knife shaft sealing structure described in the above embodiment. It also includes a driving motor 11 and a motor flange 12, wherein the output shaft of the driving motor 11 is connected to the knife shaft 5 through a coupling, and is used to drive the knife shaft 5 to rotate, so that the knife assembled on the knife shaft 5 can shear the material by rotation. The knife mounting seat 6 is fixedly connected to the motor flange 12, and one side of the knife mounting seat 6 has an arc surface that fits the wall of the mixing device cylinder, and the moving ring 4, the knife shaft 5 and part of the static ring 1 extend into the inner cavity of the mixing device. When the material in the inner cavity moves along the feed path, it will be subject to multiple obstructions of the first sealing component 2, the labyrinth gap, the air seal, the second sealing component 3, the barrier 9 and the oil seal 8, to ensure the normal operation of the knife assembly, so that the mixing device meets the needs of the current industry, that is, to meet the principles of low maintenance, high practicality and high life.

[0073] See also Figures 1 to 4 In some embodiments of the present application, the assembly process of the flying cutter shaft sealing structure is as follows:

[0074] Step 1: Assemble the elastic member 10 (i.e., the retaining ring), the right bearing 14, the knife shaft 5 and the bearing seat 7, and then assemble the sleeve 13 and the sleeve 13 from the left side of the knife shaft 5 to the inside of the bearing seat 7, and then install the stop washer 16 and the locking nut 15.

[0075] Step 2: embed the oil seal 8 between the bearing seat 7 and the fly cutter shaft 5, push in the barrier 9 and the second sealing assembly 3, then push in the stationary ring 1 equipped with the first sealing assembly 2 and the third sealing assembly 120, and finally push in the dynamic ring 4.

[0076] It should be noted that after the moving ring 4 is installed, the flying blade and the fixing nut can be installed at the free end (ie the right end) of the flying cutter shaft 5 to complete the assembly of the flying cutter assembly.

[0077] Step three: Assemble the bearing seat 7 in the motor flange 12 , sleeve the fly cutter mounting seat 6 on the outside of the stationary ring 1 and the bearing seat 7 , and fix the fly cutter mounting seat 6 to the motor flange 12 .

[0078] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0079] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0080] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A flying cutter shaft sealing structure, characterized in that: include: A stationary ring (1), wherein a first sealing component (2) is provided on the outer circumferential surface of the stationary ring (1), and a second sealing component (3) is provided on the inner circumferential surface of the stationary ring (1); A dynamic ring (4), at least a portion of which is sleeved on the outside of the stationary ring (1), and the first sealing component (2) is in contact between the outer peripheral surface of the stationary ring (1) and the inner peripheral surface of the dynamic ring (4); The flying cutter shaft (5) is inserted into the stationary ring (1) and the dynamic ring (4) in sequence, and the second sealing component (3) is in contact between the inner peripheral surface of the stationary ring (1) and the outer peripheral surface of the flying cutter shaft (5).

2. The flying cutter shaft sealing structure according to claim 1, characterized in that: The first sealing assembly (2) and the second sealing assembly (3) both comprise a plurality of sealing rings, and the end faces of two adjacent sealing rings are arranged in abutment with each other.

3. The flying cutter shaft sealing structure according to claim 1 or 2, characterized in that: The stationary ring (1), the dynamic ring (4) and the flying cutter shaft (5) are connected to form a labyrinth gap having a plurality of bending parts, and the first sealing component (2) is arranged at the front section of the labyrinth gap.

4. The flying cutter shaft sealing structure according to claim 3 is characterized in that: The flying knife shaft sealing structure also includes a flying knife mounting seat (6), the flying knife mounting seat (6) is arranged around the outer circumference of the static ring (1), the flying knife mounting seat (6) has a first air inlet hole (610), and a second air inlet hole (110) is provided on the side wall of the static ring (1), and the first air inlet hole (610) is connected with the second air inlet hole (110) and the labyrinth gap in sequence.

5. The flying cutter shaft sealing structure according to claim 4 is characterized in that: An air cavity is provided between the stationary ring (1) and the flying cutter shaft (5), and the air cavity is communicated with the second air inlet hole (110) and the labyrinth gap respectively.

6. The flying cutter shaft sealing structure according to claim 4, characterized in that: The outer circumferential surface of the stationary ring (1) is provided with a third sealing component (120), and the third sealing component (120) abuts between the outer circumferential surface of the stationary ring (1) and the inner circumferential surface of the flying cutter mounting seat (6).

7. The flying cutter shaft sealing structure according to claim 1 or 2, characterized in that: The flying cutter shaft sealing structure also includes a bearing seat (7), an oil seal (8) is embedded in one end of the bearing seat (7) close to the second sealing component (3), and a barrier (9) is provided between the oil seal (8) and the second sealing component (3).

8. The flying cutter shaft sealing structure according to claim 7, characterized in that: The diameter of the barrier (9) is greater than the diameter of the second sealing assembly (3), and the inner circumferential surface of the stationary ring (1) has a first limiting step surface (130) matching the barrier (9) and the second sealing assembly (3); The diameter of the barrier member (9) is greater than the diameter of the oil seal (8), and the inner circumferential surface of the bearing seat (7) has a second limiting step surface (710) that matches the static ring (1) and the oil seal (8), and at least a portion of the second limiting step surface (710) abuts against the end face of the barrier member (9).

9. The flying cutter shaft sealing structure according to claim 7, characterized in that: An elastic member (10) is provided on a side of the oil seal (8) away from the blocking member (9).

10. A mixing device, characterized in that: It comprises a flying cutter shaft sealing structure as described in any one of claims 1 to 9.

Images