Fly cutter sealing device of coulter type mixer

Abstract

The utility model discloses a fly cutter sealing device of a coulter type mixing machine. Relates to the field of fly-cutter sealing and comprises a fly-cutter shaft, a shaft sleeve is fixedly sleeved on the fly-cutter shaft, a static grinding sleeve is sleeved outside the shaft sleeve, the static grinding sleeve is fixedly connected with a fly-cutter seat, and a gap is reserved between the static grinding sleeve and the shaft sleeve; a plurality of through holes are formed in the shaft sleeve and are arranged at intervals in the length direction and the circumferential direction of the shaft sleeve; a floating ring is connected into the through hole in a sliding mode and slides to abut against the fly cutter shaft or the static grinding sleeve. Through the arrangement of the static grinding sleeve, the shaft sleeve and the floating ring, under the condition of high-speed rotation, the floating ring is thrown out of the through hole under the action of centrifugal force, so that the floating ring is tightly attached to the inner wall of the static grinding sleeve to rotate, the sealing effect is achieved, and the sealing structure is sealed when rotating and stops sealing; and the situation that the friction ring collapses and is locked due to the fact that materials are solidified on the sealing ring and the next starting torque is too large is prevented.

Description

Technical Field

[0001] The utility model relates to the field of flying knife sealing, in particular to a flying knife sealing device of a plowshare mixer. Background Art

[0002] The plowshare mixer can solve the agglomeration problem during the material mixing process. In the plowshare mixer, the knife shaft is rotatably connected to the knife seat, and the knife shaft drives the knife to rotate at high speed. The material lifted by the plowshare is sheared and diffused at high speed when passing through the high-speed rotating knife. In order to avoid leakage of materials in the cylinder, the knife shaft is often required to be sealed, and the existing knife shaft sealing device is mainly an oil seal and an air seal structure. However, when facing the mixing of high-hardness and strong acid slurry, the existing structure is not applicable, especially under the working condition that compressed air is not allowed to pass through the cavity, the traditional air seal is even more unreliable. The traditional air seal requires the introduction of compressed air to clean the internal sealing gap, and the air pressure required is higher than the air pressure in the cavity, so that the air seal can achieve the sealing effect. The reliability of the traditional oil seal is poor when facing the sealing of high-hardness materials, and the lip is seriously heated. Utility Model Content

[0003] In order to effectively seal the coulter cutter shaft, the present application provides a coulter-type mixer cutter sealing device.

[0004] The present application provides a flying knife sealing device for a plowshare mixer, which adopts the following technical solution:

[0005] A flying knife sealing device for a plowshare mixer comprises a flying knife shaft, a shaft sleeve is provided on the fixed sleeve of the flying knife shaft, a static grinding sleeve is provided on the outer sleeve of the shaft sleeve, the static grinding sleeve is fixedly connected to the flying knife seat and a gap is left between the static grinding sleeve and the shaft sleeve; a plurality of through holes are provided on the shaft sleeve, and the plurality of through holes are arranged at intervals along the length direction and circumferential direction of the shaft sleeve; a floating ring is slidably connected in the through hole, and the floating ring slides to abut the flying knife shaft or the static grinding sleeve.

[0006] Optionally, a friction sleeve is fixedly provided on the flying cutter shaft, and a shoulder for limiting the sliding of the friction sleeve is also provided on the flying cutter shaft, one end of the friction sleeve abuts against the shoulder, and the other end abuts against the sleeve; the friction sleeve abuts against the static wear sleeve.

[0007] Optionally, the mating ends of the flying cutter shaft and the shaft sleeve are polyhedral shafts; and the inner hole of the shaft sleeve is a polygonal hole.

[0008] Optionally, the flying cutter shaft is also provided with a flat position for mounting the friction sleeve.

[0009] Optionally, the front section of the static grinding sleeve is conical, and the rear section is provided with a flat portion.

[0010] Optionally, a boss is provided at the front section of the static grinding sleeve; the gap between the shaft sleeve and the static grinding sleeve is 1-2 mm, and the gap between the boss and the shaft sleeve is 0.5-1 mm.

[0011] Optionally, a discharge hole is provided on the static grinding sleeve.

[0012] Optionally, the static wear sleeve is made of acid and alkali resistant material, and the floating ring and the friction ring are made of acid and alkali resistant, self-lubricating, and low expansion material.

[0013] In summary, this application includes the following beneficial technical effects:

[0014] The present application arranges a static grinding sleeve, a shaft sleeve and a floating ring. Under high-speed rotation, the floating ring is thrown out of the through hole by the centrifugal force, thereby rotating closely against the inner wall of the static grinding sleeve to play a sealing role. The sealing structure seals when rotating and does not seal when stopped. It prevents the material from solidifying on the sealing ring, which would cause the friction ring to collapse and lock due to excessive torque at the next startup. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a sectional view of the overall structure of a flying knife sealing device for a plowshare mixer of the present application;

[0016] Figure 2 yes Figure 1 The overall structure diagram of the middle flying knife shaft;

[0017] Figure 3 yes Figure 1 The overall structure diagram of the middle shaft sleeve;

[0018] Figure 4 yes Figure 1 The overall structure diagram of the friction ring;

[0019] Figure 5 yes Figure 1 The overall structure diagram of the static grinding sleeve.

[0020] Description of reference numerals:

[0021] 1. Flying knife; 2. Flying knife shaft; 21. Octahedral shaft; 3. Bushing; 31. Square hole; 32. Through hole; 4. Floating ring; 5. Friction ring; 6. Static grinding sleeve; 61. Boss; 62. Discharge hole; 7. Flying knife seat. DETAILED DESCRIPTION

[0022] The following is combined with Figure 1-5 This application is described in further detail.

[0023] The embodiment of the present application discloses a flying knife sealing device for a plowshare mixer, which is installed between a flying knife shaft 2 and a flying knife seat 7; it includes a sleeve 3, a static grinding sleeve 6, a friction ring 5 and a floating ring 4; wherein the sleeve 3 and the friction ring 5 are sleeved on the flying knife shaft 2, the inner hole of the sleeve 3 is a four-sided hole, the flying knife shaft 2 and the sleeve 3 matching section is an octahedral shaft 21, the square hole 31 in the sleeve 33 is in contact with the four sides of the flying knife shaft 22, thereby driving the sleeve 33 to rotate; a plurality of through holes 32 are provided on the sleeve 3; the through holes 32 are provided along the length direction and the circumferential direction of the sleeve 3 and are staggered; a floating ring 4 is embedded in each through hole 32; when the flying knife shaft 2 rotates, the floating ring 4 is thrown out under the action of centrifugal force.

[0024] The static grinding sleeve 6 is fixedly connected to the flying cutter seat 7 by bolts, and a gap of 1 mm is arranged between the static grinding sleeve 6 and the shaft sleeve 3; the side of the floating ring 4 close to the static grinding sleeve 6 is an arc surface, and its arc matches the inner diameter of the static grinding sleeve 6; therefore, when the floating ring 4 is thrown out, the floating ring 4 abuts against the static grinding sleeve 6, thereby completing the sealing effect.

[0025] A shoulder is provided on the flying cutter shaft 2, and the friction ring 5 is sleeved on the flying cutter shaft 2 and abuts against the shoulder, and the other end of the friction ring 5 abuts against the shaft sleeve 3; the friction ring 5 fits against the inner wall of the static grinding sleeve 6, and a flat position is left in the inner hole of the friction ring 5. Through the flat position, the friction ring 5 rotates together with the flying cutter shaft 2, and the friction ring 5 and the static grinding sleeve 6 have the effect of friction sealing.

[0026] The front end of the static grinding sleeve 6 is conical, and the rear end is provided with a flat position, which is convenient for clamping and tightening with a wrench; there is a boss 61 at the front end of the static grinding sleeve 6, and the gap between the boss 61 and the shaft sleeve 3 is controlled at 0.5-1mm. The conical static grinding sleeve 6 is immersed in the slurry in actual use, and the increase in the contact area has the effect of heat dissipation, which can effectively alleviate the friction temperature rise between the floating friction ring 5 and the static grinding sleeve 6. The conical design is not conducive to material accumulation and is helpful for sealing; at the same time, the setting of the boss 61 reduces the risk of material entering the interior of the sealing device and reduces the sealing pressure; a discharge hole 62 is provided on the static grinding sleeve 6 to re-introduce a trace amount of slurry entering the sealing cavity into the mixer. The hole can be opened or closed depending on the fluidity of the slurry, and can be closed by sealing with a plug.

[0027] The flying cutter 1, flying cutter shaft 2, bushing 3, static grinding sleeve 6, flying cutter seat 7 and octahedral shaft 21 are all made of corrosion-resistant metal materials, such as 304, 316L, 2025 and other alloy materials. The floating ring 4 and friction ring 5 are made of customized pure graphite or antimony-impregnated graphite, which are acid-resistant and alkali-resistant and have certain wear resistance. The inner wall of the static grinding sleeve 6 is chrome-plated or polished with an accuracy of Ra0.2 or above. At the same time, this structure is conducive to reducing processing accuracy and assembly difficulty. The fits at various locations are mostly clearance fits. The friction ring 5 is made of graphite material, which has lubricity and is also very easy to be installed in the static grinding sleeve 6.

[0028] The flying cutter 1, the shaft sleeve 3, the floating ring 4, the friction ring 5, and the static grinding sleeve 6 are all sequentially sleeved on the flying cutter shaft 2, avoiding the need for fastening with bolts and screws, and facilitating the later replacement and maintenance of the floating ring 4 and the friction ring 5 as wearing parts, and the operation can be performed without disassembling the rotating part of the flying cutter 1.

[0029] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A flying knife sealing device for a plowshare mixer, comprising a flying knife shaft, characterized in that: A shaft sleeve (3) is fixedly mounted on the flying cutter shaft (2), a static grinding sleeve (6) is disposed on the outer sleeve of the shaft sleeve (3), the static grinding sleeve (6) is fixedly connected to the flying cutter seat (7) and a gap is left between the static grinding sleeve (6) and the shaft sleeve (3); a plurality of through holes (32) are arranged at intervals along the length direction and the circumferential direction of the shaft sleeve (3); a floating ring (4) is slidably connected in the through hole (32), and the floating ring (4) slides to abut against the flying cutter shaft (2) or the static grinding sleeve (6).

2. A flying blade sealing device for a plowshare mixer according to claim 1, characterized in that: The fly cutter shaft (2) is also provided with a fixed sleeve of a friction ring (5), and the fly cutter shaft (2) is also provided with a shaft shoulder for limiting the sliding of the friction ring (5); one end of the friction ring (5) abuts against the shaft shoulder, and the other end abuts against the shaft sleeve (3); the friction ring (5) abuts against the static grinding sleeve (6).

3. A flying blade sealing device for a plowshare mixer according to claim 1, characterized in that: The mating ends of the flying cutter shaft (2) and the shaft sleeve (3) are polyhedral shafts; and the inner hole of the shaft sleeve (3) is a polygonal hole.

4. A flying blade sealing device for a plowshare mixer according to claim 2, characterized in that: The flying cutter shaft (2) is also provided with a flat position for installing the friction ring (5).

5. A flying blade sealing device for a plowshare mixer according to claim 1, characterized in that: The front section of the static grinding sleeve (6) is conical, and the rear section is provided with a flat portion.

6. A flying blade sealing device for a plowshare mixer according to claim 5, characterized in that: The front section of the static grinding sleeve (6) is provided with a boss (61); the gap between the shaft sleeve (3) and the static grinding sleeve (6) is 1-2 mm, and the gap between the boss (61) and the shaft sleeve (3) is 0.5-1 mm.

7. A flying blade sealing device for a plowshare mixer according to claim 6, characterized in that: The static grinding sleeve (6) is provided with a discharge hole (62).

8. A flying blade sealing device for a plowshare mixer according to claim 2, characterized in that: The static grinding sleeve (6) is made of acid and alkali resistant material, and the floating ring (4) and the friction ring (5) are made of acid and alkali resistant, self-lubricating, and low-expansion materials.

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