Fly cutter shaft sealing device and coulter type mixer

Abstract

The utility model relates to a fly-cutter shaft sealing device and a coulter type mixing machine, the fly-cutter shaft sealing device comprises a mounting seat, a rotating shaft, a sealing static ring and a gas blocking ring, and a shaft hole is formed in the mounting seat in a penetrating manner; the first end of the rotating shaft is rotationally arranged in the shaft hole through a bearing, and the second end of the rotating shaft is connected with a fly-cutter set. The sealing static ring is connected with the mounting base, the sealing static ring is arranged on the outer side of the rotating shaft in a sleeving mode and located between the bearing and the fly-cutter set, an air inlet hole is formed in the sealing static ring, and the rotating shaft communicates with the outside through the air inlet hole; the gas blocking ring is arranged between the rotating shaft and the sealing static ring and connected with the sealing static ring, and a spiral structure is formed at the position, opposite to the gas blocking ring, of the peripheral side of the rotating shaft. The problems that a contact type seal is abraded in the using process, the seal loses efficacy when the contact type seal is abraded to a certain amount, materials leak, and the materials enter a bearing in a sealing device, so that the bearing is stuck are solved.

Description

Technical Field

[0001] The present application relates to the technical field of pneumatic conveying, and in particular to a flying cutter shaft sealing device and a plowshare mixer. Background Art

[0002] The plow blade mixer can solve the problems of agglomeration and agglomeration in the process of material mixing. When the plow blade mixer is running, the main shaft drives the plow blade to rotate, and the fly blade shaft drives the fly blade to rotate at high speed. The material in the cylinder is thrown up by the strong action of the plow blade. Part of the material moves in a circle along the cylinder wall, while the other part of the material is thrown to the center of the cylinder or scattered to the two ends of the cylinder along the normal direction of the plow blade wall, and the floating diffusion mixing is carried out. At the same time, when the material flows through the high-speed rotating fly blade, it is sheared and strongly diffused at high speed, and shearing diffusion mixing is carried out. Therefore, the movement tracks of the powder and particles in the mixer are crisscrossed and collide with each other, generating strong vortexes, and achieving uniform mixing in a very short time.

[0003] In order to avoid leakage of materials in the cylinder, it is often necessary to seal the knife shaft. The existing knife shaft seal adopts methods such as filler seal or skeleton oil seal, but the above sealing methods all adopt a contact method for rear end sealing from the overall structure. However, the contact seal will be worn during use. When it is worn to a certain amount, the seal will fail, resulting in material leakage. The material will enter the bearing in the sealing device and cause the bearing to get stuck. Utility Model Content

[0004] The present application provides a flying knife shaft sealing device and a plowshare mixer to solve the problem of seal failure caused by wear of the contact seal.

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

[0006] A mounting seat having an axial hole extending therethrough;

[0007] A rotating shaft, wherein the first end of the rotating shaft is rotatably disposed in the shaft hole through a bearing, and the second end of the rotating shaft is connected to a flying cutter assembly;

[0008] A sealing static ring connected to the mounting seat, the sealing static ring is sleeved on the outer side of the rotating shaft and is located between the bearing and the flying cutter assembly, an air inlet hole is opened on the sealing static ring, and the rotating shaft is connected to the outside through the air inlet hole; and

[0009] The air blocking ring is arranged between the rotating shaft and the sealing static ring and connected to the sealing static ring. A spiral structure is formed at the outer peripheral side of the rotating shaft and the position opposite to the air blocking ring.

[0010] In a possible implementation, the air blocking ring includes a coaxial air blocking first part and an air blocking second part, the diameter of the first air blocking part is larger than the diameter of the second air blocking part, the first air blocking part is arranged toward the first end, and the air inlet hole is connected to the spiral structure of the rotating shaft through the second air blocking part.

[0011] In a possible implementation, the sealing static ring includes a first static ring part and a second static ring part that are connected, and the first static ring part is used to cooperate with the air blocking ring; a sealing dynamic ring is connected to the rotating shaft, and the sealing dynamic ring is sleeved on the outside of the rotating shaft and contacts and cooperates with the second static ring part.

[0012] In a possible implementation manner, an air outlet gap is provided between a side of the sealing dynamic ring facing the first end and the sealing static ring.

[0013] In a possible implementation, the sealing dynamic ring includes a first dynamic ring part and a second dynamic ring part connected to each other, the second dynamic ring part is connected to the rotating shaft, the first dynamic ring part is sleeved on the outside of the second static ring part, and a retaining ring is arranged between them.

[0014] In a possible implementation, a material stopping groove is formed on the second portion of the stationary ring, the material stopping ring is disposed in the material stopping groove, and a groove depth of the material stopping groove is smaller than a height of the material stopping ring.

[0015] In a possible implementation, the retaining ring is an elastic member.

[0016] In a possible implementation manner, a baffle is provided on a side of the sealing static ring facing the bearing, and the baffle is sleeved on an outer side of the rotating shaft.

[0017] In a possible implementation, a skeleton oil seal is provided between the sealing static ring and the baffle.

[0018] In a second aspect, the present application provides a plowshare mixer, comprising the plowshare shaft sealing device described in the first aspect.

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

[0020] The knife shaft sealing device and plowshare mixer provided in this embodiment, the mounting seat is used to connect with other components, so as to connect the whole device to other components, so as to ensure the stability of the whole device. The rotating shaft is rotatably arranged in the axial hole of the mounting seat, and the stability of rotation is ensured by the mutual cooperation between the bearing and the axial hole. The sealing static ring is used for sealing and is connected to the mounting seat. The sealing static ring remains fixed. The rotating shaft is rotatably arranged inside the sealing static ring relative to the sealing static ring. Similarly, the air blocking ring is connected to the sealing static ring. During the rotation of the rotating shaft, the air blocking ring is also fixed. The second end of the rotating shaft is connected to the knife group, and the rotation of the rotating shaft drives the synchronous rotation of the knife group, so as to realize the stirring effect of the knife group. The rotating shaft will drive the spiral structure formed thereon to rotate synchronously during the rotation process. There is a tiny installation gap between the spiral structure and the air blocking ring. The high-speed rotation of the rotating shaft causes the installation gap formed between the spiral structure and the air blocking ring to form an air film pressure, which prevents the compressed air from flowing toward the first end of the rotating shaft, thereby causing the compressed air to flow toward the second end of the rotating shaft, that is, the compressed air flows toward one side of the flying knife group, thereby relying on the airflow to prevent the material from flowing in the reverse direction along the airflow flow route, thereby achieving a sealing effect. 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 This is a sectional view of the overall structure of a flying cutter shaft sealing device provided in an embodiment of the present application.

[0025] Figure 2 for Figure 1 Enlarged view of part A in the middle.

[0026] Figure 3 A three-dimensional diagram of a rotating shaft in a flying cutter shaft sealing device provided in an embodiment of the present application.

[0027] Figure 4A three-dimensional diagram of an air blocking ring in a flying cutter shaft sealing device provided in an embodiment of the present application.

[0028] Description of reference numerals:

[0029] 1. Mounting seat; 2. Rotation axis; 21. First end; 22. Second end; 23. Helical structure;

[0030] 3. Sealing static ring; 31. First part of static ring; 32. Second part of static ring; 33. Air inlet;

[0031] 4. Flying knife set; 5. Air blocking ring; 51. Air blocking part 1; 52. Air blocking part 2;

[0032] 6. Bearing; 7. Airflow clearance;

[0033] 8. Sealing dynamic ring; 81. Dynamic ring first part; 82. Dynamic ring second part;

[0034] 9. Material retaining ring; 10. Air outlet gap; 11. Baffle; 12. Skeleton oil seal. DETAILED DESCRIPTION

[0035] 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.

[0036] 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.

[0037] 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.

[0038] Reference Figure 1-Figure 4 , the embodiment of the present application provides a flying cutter shaft sealing device, comprising:

[0039] A mounting seat 1, on which an axial hole is formed;

[0040] A rotating shaft 2, wherein a first end 21 of the rotating shaft 2 is rotatably disposed in the shaft hole through a bearing 6, and a second end 22 of the rotating shaft 2 is connected to a flying cutter assembly 4;

[0041] A sealing static ring 3 is connected to the mounting seat 1, the sealing static ring 3 is sleeved on the outer side of the rotating shaft 2 and is located between the bearing 6 and the flying cutter assembly 4, and an air inlet 33 is opened on the sealing static ring 3, and the rotating shaft 2 is connected to the outside through the air inlet 33; and

[0042] The air blocking ring 5 is disposed between the rotating shaft 2 and the sealing static ring 3 and connected to the sealing static ring 3 . A spiral structure 23 is formed on the outer peripheral side of the rotating shaft 2 opposite to the air blocking ring 5 .

[0043] Among them, the mounting seat 1 is used to connect with other components, so as to connect the whole device to other components, so as to ensure the stability of the whole device. The rotating shaft 2 is rotatably set in the axial hole of the mounting seat 1, and the stability of rotation is ensured by the mutual cooperation between the bearing 6 and the axial hole. The sealing static ring 3 is used for sealing and is connected to the mounting seat 1. The sealing static ring 3 remains fixed. The rotating shaft 2 is rotatably set inside the sealing static ring 3 relative to the sealing static ring 3. Similarly, the air blocking ring 5 is connected to the sealing static ring 3. During the rotation of the rotating shaft 2, the air blocking ring 5 is also fixed. The second end 22 of the rotating shaft 2 is connected to the flying knife group 4. The rotation of the rotating shaft 2 drives the synchronous rotation of the flying knife group 4, so as to realize the stirring effect of the flying knife group 4. During the rotation process, the rotating shaft 2 will drive the spiral structure 23 formed thereon to rotate synchronously. There is a tiny installation gap between the spiral structure 23 and the air blocking ring 5. The high-speed rotation of the rotating shaft 2 causes the installation gap formed between the spiral structure 23 and the air blocking ring 5 to form an air film pressure, which prevents the compressed air from flowing toward the first end 21 of the rotating shaft 2, thereby causing the compressed air to flow toward the second end 22 of the rotating shaft 2, that is, the compressed air flows toward one side of the flying knife group 4, thereby relying on the airflow to prevent the material from flowing in the reverse direction along the airflow flow route, thereby achieving a sealing effect.

[0044] In some embodiments, two bearings 6 are disposed at intervals on the first end 21 of the rotating shaft 2 along its own axial direction to improve the stability of the rotating shaft 2 .

[0045] The sealing static ring 3 is connected to the outside and the rotating shaft 2 through the air inlet hole 33. The opening direction of the air inlet hole 33 is not limited in this application. Optionally, the air inlet hole 33 is set on the sealing static ring 3 along the radial direction of the rotating shaft 2.

[0046] Reference Figure 1-Figure 4 In some embodiments, the air blocking ring 5 includes a coaxial air blocking first part 51 and an air blocking second part 52, the diameter of the air blocking first part 51 is larger than the diameter of the air blocking second part 52, the air blocking first part 51 is arranged toward the first end 21, and the air inlet 33 is connected to the spiral structure 23 of the rotating shaft 2 through the air blocking second part 52. The air blocking first part 51 faces the first end 21 of the rotating shaft 2 and is connected to the sealing static ring 3, the diameter of the air blocking second part 52 is smaller than the diameter of the air blocking first part 51, so that the gas entering through the air inlet 33 flows toward the rotating shaft 2 through the air blocking second part 52, and in addition, the diameter of the air blocking first part 51 is larger than the diameter of the air blocking second part 52, which can also hinder the movement of air, and further prevent the air from moving toward the first end 21 of the rotating shaft 2.

[0047] Optionally, an airflow gap 7 is provided between the second air-blocking portion 52 and the sealing static ring 3 , and the air entering into the air-blocking ring 5 can be communicated with the rotating shaft 2 through the airflow gap 7 .

[0048] In some embodiments, the sealing static ring 3 includes a first static ring portion 31 and a second static ring portion 32 connected to each other, and the first static ring portion 31 is used to cooperate with the air blocking ring 5; the rotating shaft 2 is connected with a sealing dynamic ring 8, and the sealing dynamic ring 8 is sleeved on the outside of the rotating shaft 2 and contacts and cooperates with the second static ring portion 32. Among them, the air blocking ring 5 is arranged between the first static ring portion 31 and the rotating shaft 2, and the second static ring portion 32 is directly sleeved on the outside of the rotating shaft 2, so the diameter of the first static ring portion 31 is larger than that of the second static ring portion 32. In addition, a very small installation gap will be formed between the sealing dynamic ring 8 and the sealing static ring 3, and between the second part 32 of the static ring and the rotating shaft 2, which is connected with the air flow gap 7, the outer side of the second air blocking part 52 and the air inlet 33, forming an air flow channel; the air entering from the air inlet 33 will flow along the air flow channel under the action of the rotation of the rotating shaft 2 and the action of the spiral structure 23 on the rotating shaft 2, thereby moving in the direction away from the bearing 6, effectively avoiding the situation where the material is blown into the bearing 6, thereby ensuring the reliability of the sealing of the device.

[0049] An air outlet gap 10 is provided between the side of the sealing dynamic ring 8 facing the first end 21 and the sealing static ring 3; the air outlet gap 10 is connected to the installation gap between the sealing dynamic ring 8 and the sealing static ring 3, and the air outlet gap is also connected to the outside world, so the air outlet gap 10 also serves as an air outlet of the air flow channel, so that the material entering the inside of the device can be blown in a direction away from the bearing 6 and blown out of the device.

[0050] The sealing dynamic ring 8 includes a first dynamic ring part 81 and a second dynamic ring part 82 connected to each other, the second dynamic ring part 82 is connected to the rotating shaft 2, the first dynamic ring part 81 is sleeved on the outer side of the second static ring part 32, and a material retaining ring 9 is arranged between them; during the rotation of the rotating shaft 2, the outside air will enter the device through the air inlet 33, and flow through the outer side of the second air blocking part 52, the air flow gap 7, the gap between the second static ring part 32 and the rotating shaft 2, the gap between the second static ring part 32 and the sealing dynamic ring 8, and the gap between the second static ring part 32 and the first dynamic ring part 81 to the air outlet gap 10, and blown out from the device. This ensures that when material enters, it will be blown out from the inside of the device along the above-mentioned air flow channel by air, avoiding the situation where the material enters the bearing 6 and causes the bearing 6 to get stuck, and ensures the sealing effect. In addition, the retaining ring 9 is used to seal the gap between the first part of the dynamic ring 8 and the second part 32 of the static ring. The dynamic sealing ring 8 rotates synchronously with the high-speed rotation of the rotating shaft 2, and the static sealing ring 3 is fixed with the mounting seat 1. Therefore, the dynamic sealing ring 8 will rotate at a high speed relative to the static sealing ring 3. The retaining ring 9 will be continuously worn during the rotation, so that a gap will be formed between the retaining ring 9 and the dynamic sealing ring 8. The gap can be passed by the airflow, thereby not affecting the circulation of the above-mentioned airflow.

[0051] A material stopping groove is opened on the second part 32 of the static ring, and the material stopping ring 9 is arranged in the material stopping groove, and the groove depth of the material stopping groove is less than the height of the material stopping ring 9; the height of the material stopping ring 9 is set higher than the groove depth of the material stopping groove, so that after the material stopping ring 9 is embedded in the material stopping groove, a part of the material stopping ring 9 will protrude from the material stopping groove, and the part protruding from the material stopping groove is used to cooperate with the sealing dynamic ring 8 to achieve a sealing effect.

[0052] The retaining ring 9 is an elastic member. By setting the retaining ring 9 as an elastic member, when the rotating shaft 2 rotates at a high speed, it relies on its own elasticity to form a gap smaller than the design accuracy without causing interference; when the rotating shaft 2 does not rotate, its elastic recovery will seal between the sealing static ring 3 and the sealing dynamic ring 8, thereby better preventing materials from entering.

[0053] Reference Figure 1-Figure 4 In some embodiments, a baffle 11 is provided on the side of the sealing static ring 3 facing the bearing 6, and the baffle 11 is sleeved on the outer side of the rotating shaft 2; the baffle 11 is provided to hinder the movement of materials toward the bearing 6 to a certain extent, thereby preventing the materials from entering the bearing 6 and causing the bearing 6 to be stuck.

[0054] A skeleton oil seal 12 is provided between the sealing static ring 3 and the baffle 11. The skeleton oil seal 12 is used to play a sealing role. When the rotating shaft 2 does not rotate, the skeleton oil seal 12 seals the side of the air blocking ring 5 toward the first end 21 of the rotating shaft 2 to prevent the entry of materials, thereby achieving a parking seal effect. When the rotating shaft 2 rotates at a high speed in actual operation, the skeleton oil seal 12 only plays an auxiliary sealing role, so even if it is worn later, it will not cause sealing failure.

[0055] In summary, the knife shaft sealing device provided by the present application forms a high-pressure air film through the high-speed rotation of the spiral structure 23 and the extremely small gap between it and the air blocking ring 5, forming its non-contact air blocking structure, so that the airflow can efficiently flow along the guide line and form an isolation between the material and the seal to achieve the sealing effect; the non-contact structure is adopted, and the seal failure will not be caused by wear, which greatly improves the service life of the seal and reduces the maintenance cost; the first end 21 and the second end 22 of the entire rotating shaft 2 are provided with corresponding auxiliary structures to achieve the parking seal effect, so that the sealing effect can still be achieved when the rotating shaft 2 is stopped. In addition, a non-metallic retaining ring 9 is used between the sealing static ring 3 and the sealing dynamic ring 8, which can not only form a higher compressed air purge pressure that is much smaller than the metal design structure gap, thereby improving the sealing effect; but also achieve the parking seal effect when the rotating shaft 2 stops and the spiral air blocking structure does not work.

[0056] Reference Figure 1-Figure 4 , an embodiment of the present application provides a plowshare mixer, comprising a plowshare shaft sealing device as described in the above embodiment.

[0057] 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.

[0058] 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.

[0059] 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 device, characterized in that: include: A mounting seat having an axial hole extending therethrough; A rotating shaft, wherein the first end of the rotating shaft is rotatably disposed in the shaft hole through a bearing, and the second end of the rotating shaft is connected to a flying cutter assembly; A sealing static ring connected to the mounting seat, the sealing static ring is sleeved on the outer side of the rotating shaft and is located between the bearing and the flying cutter assembly, an air inlet hole is opened on the sealing static ring, and the rotating shaft is connected to the outside through the air inlet hole; and The air blocking ring is arranged between the rotating shaft and the sealing static ring and connected to the sealing static ring. A spiral structure is formed at the outer peripheral side of the rotating shaft opposite to the air blocking ring.

2. The flying cutter shaft sealing device according to claim 1, characterized in that: The air blocking ring includes a coaxial air blocking first part and an air blocking second part, the diameter of the air blocking first part is larger than the diameter of the air blocking second part, the air blocking first part is arranged toward the first end, and the air inlet is connected to the spiral structure of the rotating shaft through the air blocking second part.

3. The flying cutter shaft sealing device according to claim 1, characterized in that: The sealing static ring includes a first static ring part and a second static ring part connected to each other, and the first static ring part is used to cooperate with the air blocking ring; a sealing dynamic ring is connected to the rotating shaft, and the sealing dynamic ring is sleeved on the outside of the rotating shaft and contacts and cooperates with the second static ring part.

4. The flying cutter shaft sealing device according to claim 3, characterized in that: An air outlet gap is arranged between the side of the sealing dynamic ring facing the first end and the sealing static ring.

5. The flying cutter shaft sealing device according to claim 3, characterized in that: The sealing dynamic ring comprises a first dynamic ring part and a second dynamic ring part connected to each other, the second dynamic ring part is connected to the rotating shaft, the first dynamic ring part is sleeved on the outer side of the second static ring part, and a retaining ring is arranged between them.

6. The flying cutter shaft sealing device according to claim 5, characterized in that: A material-blocking groove is provided on the second portion of the stationary ring, the material-blocking ring is arranged in the material-blocking groove, and the groove depth of the material-blocking groove is smaller than the height of the material-blocking ring.

7. The flying cutter shaft sealing device according to claim 5, characterized in that: The retaining ring is an elastic member.

8. The flying cutter shaft sealing device according to any one of claims 1 to 7, characterized in that: A baffle is provided on the side of the sealing static ring facing the bearing, and the baffle is sleeved on the outer side of the rotating shaft.

9. The flying cutter shaft sealing device according to claim 8, characterized in that: A skeleton oil seal is arranged between the sealing static ring and the baffle.

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

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