Fly cutter shaft clutch type moving shaft sealing device of coulter type mixer

Abstract

The utility model discloses a coulter type mixer fly cutter shaft clutch type moving shaft sealing device which comprises a fly cutter, a fly cutter shaft and a fly cutter seat, the fly cutter is installed at one end of the fly cutter shaft, and the fly cutter shaft and the fly cutter seat are assembled in a rotating mode. The device further comprises a spiral sleeve, a static ring, a movable ring, a springback structure and a pushing structure, the spiral sleeve and the movable ring are both assembled with the fly cutter shaft in a synchronous rotating and sleeving mode, a spiral groove is formed in the outer side wall of the spiral sleeve, the static ring is assembled outside the spiral sleeve in a clearance sleeving mode and fixedly assembled with the fly cutter base, and a spiral sealing structure is formed between the static ring and the spiral sleeve. A labyrinth sealing structure is formed between the static ring and the moving ring through staggered and meshed concave-convex structures; the springback structure and the pushing structure are installed on the two sides of the movable ring respectively. The sealing device has the advantages of being good in sealing performance, long in service life, low in cost and convenient to maintain and repair.

Description

Technical Field

[0001] The utility model relates to the technical field of dynamic shaft sealing, in particular to a flying cutter shaft clutch type dynamic shaft sealing device for a plowshare mixer. Background Art

[0002] The plowshare mixer uses high-speed rotating knives to achieve high-speed diffusion and shearing of materials to speed up material mixing and solve the problem of agglomeration during material mixing. According to feedback from a large number of plowshare mixer users, the current knife shaft dynamic shaft sealing device still cannot meet the use requirements when the plowshare mixer is processing high-hardness solid-liquid slurry. The main reason is that when mixing slurries with high-hardness solid particles, the solid particles cause severe wear on the seals. The liquid medium therein has strong fluidity and is even corrosive. Therefore, conventional contact seals are difficult to meet the use requirements. Non-contact dynamic shaft seals are particularly suitable for high-speed and high-hardness medium dynamic sealing occasions because they have no wear and do not generate frictional heat, but their main disadvantage is the insufficient sealing ability after shutdown. Therefore, it is very necessary to propose a plowshare mixer knife dynamic shaft sealing device suitable for mixing high-hardness slurries. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide a plowshare mixer fly blade shaft clutch type dynamic shaft sealing device, which has the advantages of good sealing performance, long service life, low cost and convenient maintenance.

[0004] The utility model solves the above problems through the following technical means:

[0005] The utility model provides a clutch type dynamic shaft sealing device for a plowshare mixer, comprising a plowshare, a plowshare shaft and a plowshare seat, wherein the plowshare is mounted at one end of the plowshare shaft, and the plowshare shaft is rotatably assembled with the plowshare seat; further comprising a spiral sleeve, a stationary ring, a moving ring, a rebound structure and a tightening structure, wherein the spiral sleeve and the moving ring are both synchronously rotatably sleeved and assembled with the plowshare shaft, a spiral groove is provided on the outer side wall of the spiral sleeve, the stationary ring is gap sleeved and assembled on the outside of the spiral sleeve and fixedly assembled with the plowshare seat, a spiral sealing structure is formed between the stationary ring and the spiral sleeve, and a labyrinth sealing structure is formed between the stationary ring and the moving ring by means of a staggered occlusal concave-convex structure; the rebound structure and the tightening structure are respectively mounted on both sides of the moving ring.

[0006] Furthermore, the rebound structure includes a bellows and an elastic body, the two ends of the bellows are fixedly connected to the end faces of the spiral sleeve and the dynamic ring respectively, and the elastic body is arranged in the bellows and between the spiral sleeve and the dynamic ring.

[0007] Furthermore, the pushing structure includes a thrust bearing and a piston, the thrust bearing is installed between the moving ring and the piston, the piston is sealingly and slidingly assembled with the flying knife seat, and the flying knife seat is provided with an air pressure pushing chamber for applying a driving force to the piston, and a compressed air inlet and a pressure relief hole connected to the air pressure pushing chamber.

[0008] Furthermore, a sealing liquid injection hole connected to the labyrinth sealing structure is provided on the flying knife seat. When the machine is stopped, a proper amount of sealing liquid is introduced from the sealing liquid injection hole to prevent the slurry from agglomerating in the sealing structure for a long time.

[0009] Furthermore, the flying knife seat is provided with a drainage hole connected with the labyrinth sealing structure, and the drainage hole is used to discharge the dirt in the sealing structure in time to avoid wearing the sealing structure.

[0010] Furthermore, one end of the spiral sleeve is positioned by a shaft shoulder, and the other end is positioned by a flying cutter.

[0011] Furthermore, the movable ring and the flying cutter shaft are positioned circumferentially by a key. Under the action of thrust, the movable ring can slide axially relative to the key.

[0012] Furthermore, a dust ring is installed between the assembly surface of the moving ring and the flying knife seat. The dust ring is arranged close to one side of the thrust bearing to isolate the bearing cavity and extend the service life of the bearing.

[0013] Furthermore, a sealing ring is installed between the assembly surface of the piston and the flying knife seat.

[0014] Furthermore, the flying knife shaft is rotatably assembled with the flying knife seat through a rolling bearing. The rolling bearing is installed in the flying knife seat, supports the flying knife shaft, and is axially positioned by a shaft shoulder and a bearing gland. The structure is compact.

[0015] Beneficial effects of the utility model:

[0016] The plowshare mixer blade shaft clutch type dynamic shaft sealing device of the present application, on the one hand, includes a spiral sealing structure and a labyrinth sealing structure arranged along the blade shaft; when working, the spiral sleeve rotates synchronously with the blade shaft, and the thrust generated by the spiral groove pushes the sealed medium back into the mixer cavity to avoid material leakage and form a primary seal; the labyrinth sealing structure constitutes a secondary seal to further avoid material unloading. On the other hand, when the blade shaft is running at high speed, the dynamic ring is pushed away from the static ring by the rebound structure, so that the sealing form of the labyrinth sealing structure is a non-contact seal, and when the blade stops running, the dynamic ring is pushed toward the static ring by the pushing structure, so that the sealing form of the labyrinth sealing structure is a contact seal. In this way, the advantages of contact seal and non-contact seal are comprehensively utilized, so that the entire sealing system has the advantages of good sealing performance, long service life, low cost, and convenient maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 It is a structural schematic diagram of an implementation method of the utility model.

[0019] Figure 2 yes Figure 1 Enlarged schematic diagram of the circled part.

[0020] Figure 3 It is a structural diagram of the flying knife shaft.

[0021] Figure 4 It is a schematic diagram of the structure of the spiral sleeve.

[0022] Figure 5 It is a structural diagram of the static ring.

[0023] Figure 6 It is a schematic diagram of the structure of an elastomer.

[0024] Figure 7 It is a structural diagram of the dynamic ring.

[0025] Figure 8 It is a schematic diagram of the structure of the piston.

[0026] Figure numerals: flying knife 1, flying knife shaft 2, spiral sleeve 3, static ring 4, bellows 5, elastomer 6, key 7, dynamic ring 8, dust ring 9, thrust bearing 10, sealing ring 11, piston 12, rolling bearing 13, flying knife seat 14, drain hole 1401, pressure relief hole 1402, sealing liquid injection hole 1403, compressed air inlet 1404, air pressure push chamber 1405. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with 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 of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing and simplifying the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0030] like Figures 1 to 8 As shown, this embodiment discloses a plowshare mixer fly-knife shaft clutch type dynamic shaft sealing device, comprising a fly-knife 1, a fly-knife shaft 2 and a fly-knife seat 14, wherein the fly-knife 1 is mounted at one end of the fly-knife shaft 2, and the fly-knife shaft 2 is rotatably assembled with the fly-knife seat 14 through a rolling bearing 13; the rolling bearing 13 is mounted in the fly-knife seat 14, supports the fly-knife shaft, and is axially positioned by a shaft shoulder and a bearing gland. The structure is compact.

[0031] It also includes a spiral sleeve 3, a stationary ring 4, a dynamic ring 8, a rebound structure and a push structure. The spiral sleeve 3 and the dynamic ring 8 are both synchronously rotated and sleeved with the flying cutter shaft 2. In this embodiment, one end of the spiral sleeve 3 is positioned by a shaft shoulder, and the other end is pressed and positioned by the flying cutter 1. The dynamic ring 8 and the flying cutter shaft 2 are circumferentially positioned by a key 7. Under the action of thrust, the dynamic ring can slide axially relative to the key; the outer wall of the spiral sleeve 3 is provided with a spiral groove, the stationary ring 4 is sleeved and assembled on the outside of the spiral sleeve 3 and fixedly assembled with the flying cutter seat 14, a spiral sealing structure is formed between the stationary ring 4 and the spiral sleeve 3, and a labyrinth sealing structure is formed between the stationary ring 4 and the dynamic ring 8 through a staggered concave-convex structure; the rebound structure and the push structure are respectively installed on both sides of the dynamic ring.

[0032] The rebound structure includes a bellows 5 and an elastic body 6. The two ends of the bellows 5 are fixedly connected to the end faces of the spiral sleeve 3 and the dynamic ring 8 respectively. The elastic body 6 is arranged in the bellows 5 and between the spiral sleeve 3 and the dynamic ring 8. The elastic body can be a wave spring, a round spring, etc., and the present embodiment uses a wave spring.

[0033] The thrust structure includes a thrust bearing 10 and a piston 12, wherein the thrust bearing 10 is installed between the moving ring 8 and the piston 12, the piston 12 is sealed and slidably assembled with the flying knife seat 14, and a sealing ring 11 is installed between the assembly surfaces of the piston 12 and the flying knife seat 14; the flying knife seat 14 is provided with an air pressure push chamber 1405 for applying a driving force to the piston, and a compressed air inlet 1404 and a pressure relief hole 1402 connected to the air pressure push chamber.

[0034] The flying knife seat 14 is provided with a sealing liquid injection hole 1403 communicated with the labyrinth sealing structure. When the machine is stopped, a proper amount of sealing liquid is introduced from the sealing liquid injection hole to prevent the slurry from agglomerating in the sealing structure for a long time.

[0035] The flying knife seat is provided with a drain hole 1401 connected with the labyrinth sealing structure. The drain hole 1401 is used to discharge the dirt in the sealing structure in time to avoid wearing the sealing structure.

[0036] A dust ring 9 is installed between the assembly surface of the moving ring 8 and the flying knife seat 14. The dust ring 9 is arranged close to one side of the thrust bearing 10 to isolate the bearing cavity and extend the service life of the bearing.

[0037] To make the above technical solution clearer, further explanation is given below:

[0038] The knife seat 14 is fixedly connected to the housing of the mixer, and the knife shaft 2 is sequentially constructed with a spiral sealing structure, a labyrinth sealing structure, a rebound structure and a pushing structure from the knife installation end to the driving end; the spiral sealing structure includes a spiral sleeve 3 and a static ring 4, the inner hole of the spiral sleeve 3 is connected to the knife shaft 2, one end of the spiral sleeve 3 is positioned by the shoulder of the knife shaft 2, and the other end is pressed by the assembled knife 1, and the torque is transmitted by the clamping force to achieve synchronous rotation with the knife shaft. A spiral groove is arranged on the outer wall of the spiral sleeve 3. In this embodiment, the spiral groove is a rectangular spiral groove with 3 thread lines and a pitch of 10mm. The number of thread turns is 3. The static ring 4 is fixedly connected to the knife seat by a thread, and the radial clearance between the inner hole of the static ring 4 and the spiral sleeve 3 is 0.5mm. The knife shaft drives the spiral sleeve to rotate at a high speed, and the material is pushed back into the mixer cavity by the driving force of the spiral groove, thereby preventing material leakage.

[0039] The labyrinth seal structure is composed of the sealing teeth on the end faces of the stationary ring 3 and the dynamic ring 8. Specifically, the end face of the stationary ring is coaxially provided with multiple circles of sealing teeth, and the end face of the dynamic ring is also coaxially provided with multiple circles of sealing teeth. The sealing teeth of the stationary ring and the sealing teeth of the dynamic ring are staggered and engaged with each other. The radial clearance between the engaged teeth is 1mm, and the tooth top clearance is also 1mm, that is, the labyrinth seal clearance is 1mm; the dynamic ring 8 has a certain degree of axial freedom of movement. The dynamic ring can be axially displaced under the push of the spring elastic force of the rebound separation structure and the thrust of the piston tightening structure, and can be separated or fitted with the stationary ring. The inner hole of the dynamic ring is matched with the shaft clearance, and grease is applied. The key has two functions: transmitting torque and guiding.

[0040] The wave spring 6 is selected as the shaft reference type, pre-compressed to the maximum elastic force and installed between the spiral sleeve and the moving ring to provide thrust when separating the moving ring. The bellows 5 has axial tensile and compression capabilities, and its two ends are fixedly connected to the spiral sleeve 3 and the end surface of the moving ring 8 respectively. It can change in length with the position of the moving ring to prevent the sealed medium from leaking from the gap between the moving ring and the fly cutter shaft to the bearing.

[0041] The piston 12 is annular and embedded in the flying knife seat, and the inner and outer ring surfaces are both equipped with sealing rings 11; compressed air is introduced into the air pressure push chamber 1405 through the compressed air inlet 1404, and the piston 12 extends, and the moving ring and the static ring are tightly attached through the thrust bearing 10. The two end surfaces of the thrust bearing 10 are respectively connected to the back of the moving ring and the end surface of the piston, isolating the rotating friction of the moving ring on the piston.

[0042] When the flying knife runs at high speed, the pressure relief port is connected to the atmosphere, and the air pressure pushes the cavity to relieve pressure; the rebound structure pushes the dynamic ring away from the static ring by elastic force, so that the labyrinth seal can be non-contact sealed when the flying knife runs at high speed, and the labyrinth seal structure prevents material leakage. When shutting down, an appropriate amount of sealing liquid is introduced from the sealing liquid injection hole 1403 to prevent the slurry placed in the sealing structure for a long time from agglomerating. After the flying knife shaft stops rotating, compressed air is introduced from the compressed air inlet and the pressure is maintained. Under the push of the piston, the top surface of the dynamic ring sealing tooth fits against the bottom of the groove of the static ring. At this time, the sealing form is a contact seal. The combination of the two sealing forms improves the durability of the seal and the ability to maintain the seal after shutdown.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A clutch type dynamic shaft sealing device for a plowshare mixer, comprising a flying knife (1), a flying knife shaft (2) and a flying knife seat (14), wherein the flying knife (1) is mounted on one end of the flying knife shaft (2), and the flying knife shaft (2) and the flying knife seat (14) are rotatably assembled; characterized in that: It also includes a spiral sleeve (3), a stationary ring (4), a dynamic ring (8), a rebound structure and a pushing structure. The spiral sleeve (3) and the dynamic ring (8) are both synchronously rotated and sleeved with the flying cutter shaft (2). The outer wall of the spiral sleeve (3) is provided with a spiral groove. The stationary ring (4) is sleeved on the outside of the spiral sleeve (3) and fixedly assembled with the flying cutter seat (14). A spiral sealing structure is formed between the stationary ring (4) and the spiral sleeve (3). A labyrinth sealing structure is formed between the stationary ring (4) and the dynamic ring (8) through a staggered interlocking concave-convex structure. The rebound structure and the pushing structure are respectively installed on both sides of the dynamic ring.

2. The plowshare mixer flyshaft clutch type dynamic shaft sealing device according to claim 1, characterized in that: The rebound structure comprises a bellows (5) and an elastic body (6); the two ends of the bellows (5) are respectively fixedly connected to the end faces of the spiral sleeve (3) and the movable ring (8); and the elastic body (6) is arranged inside the bellows (5) and between the spiral sleeve (3) and the movable ring (8).

3. The plowshare mixer flyshaft clutch type dynamic shaft sealing device according to claim 1, characterized in that: The thrust structure comprises a thrust bearing (10) and a piston (12), wherein the thrust bearing (10) is installed between a moving ring (8) and the piston (12), and the piston (12) is sealingly and slidingly assembled with a flying knife seat (14). The flying knife seat (14) is provided with an air pressure driving chamber for applying a driving force to the piston (12), and a compressed air inlet (1404) and a pressure relief hole (1402) which are connected to the air pressure driving chamber (1405).

4. The plowshare mixer flyshaft clutch type dynamic shaft sealing device according to claim 1, characterized in that: The flying knife seat (14) is provided with a sealing liquid injection hole (1403) which is in communication with the labyrinth sealing structure.

5. The plowshare mixer flyshaft clutch type dynamic shaft sealing device according to claim 1, characterized in that: The flying knife seat (14) is provided with a sewage discharge hole (1401) which is connected with the labyrinth sealing structure.

6. The plowshare mixer flyshaft clutch type dynamic shaft sealing device according to claim 1, characterized in that: One end of the spiral sleeve (3) is positioned by a shaft shoulder, and the other end is pressed and positioned by a flying cutter (1).

7. The plowshare mixer flyshaft clutch type dynamic shaft sealing device according to claim 1, characterized in that: The moving ring (8) and the flying cutter shaft (2) are positioned in the circumferential direction via a key (7).

8. The plowshare mixer flyshaft clutch type dynamic shaft sealing device according to claim 1, characterized in that: A dustproof ring (9) is installed between the assembly surfaces of the moving ring (8) and the flying knife seat (14).

9. The plowshare mixer flyshaft clutch type dynamic shaft sealing device according to claim 3, characterized in that: A sealing ring (11) is installed between the assembly surfaces of the piston (12) and the flying knife seat (14).

10. The plowshare mixer flyshaft clutch type dynamic shaft sealing device according to claim 1, characterized in that: The flying knife shaft (2) is rotatably assembled with the flying knife seat (14) via a rolling bearing (13).

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