A sealing structure for a stirring shaft of a kneader

Abstract

The utility model relates to a sealing structure, concretely relates to a kind of sealing structure for stirring shaft of kneader. Including bottom plate, the upper side of the bottom plate is fixedly connected with mounting plate, the side of mounting plate close to cylinder is rotatably connected with two transmission shafts by bearing, the end of transmission shaft away from mounting plate is coaxially driving connection with rotating shaft by shaft coupling, the upper side of the bottom plate is equipped with two sealing mechanisms. The utility model, sealing ring is installed in the outside of rotating shaft by fixed frame and semicircle mounting ring, under the extrusion of sealing ring, its contact position with rotating shaft bifurcates to both sides, sealing ring seals the gap between rotating shaft and cylinder to reduce material outflow, after the abrasion of rotating friction sealing ring, the two sides of sealing ring bifurcation rebound inward, so that sealing ring and rotating shaft always keep contact, extend the time of sealing ring to gap sealing, reduce its replacement frequency.

Description

Technical Field

[0001] This utility model relates to a sealing structure, specifically, to a sealing structure for a mixing shaft of a kneader. Background Technology

[0002] A kneader is an ideal piece of equipment for kneading, mixing, vulcanizing, and polymerizing high-viscosity, elasto-plastic materials. It can be used to produce silicone rubber, sealants, hot melt adhesives, food-grade gum bases, pharmaceutical preparations, etc. The kneader mainly consists of a cylinder 3, a rotating shaft 31 rotatably connected to the side wall of the cylinder 3, and stirring blades 32 fixedly connected to the rotating shaft 31. An external drive motor drives the rotating shaft 31 and stirring blades 32 to rotate and mix the materials inside the cylinder 3. To prevent materials from flowing out of the gap between the rotating shaft 31 and the cylinder 3, PTFE packing or other sealing rings are typically used to seal the gap. During the rotation of the rotating shaft 31... Damage to the sealing ring caused by rotational friction leads to a gap between the sealing ring and the rotating shaft 31, reducing its sealing effect on the gap between the rotating shaft 31 and the cylinder 3. Therefore, the sealing ring needs to be replaced frequently, affecting the efficiency of the kneader. In addition, during the replacement of the sealing ring, it is usually necessary to remove the protective shell and drive components such as the motor on the outside of the rotating shaft 31, and then use special tools to remove the sealing ring from the gap between the rotating shaft 31 and the cylinder 3. This results in a long replacement time and reduced replacement efficiency, affecting the overall efficiency of the kneader. In view of this, we propose a sealing structure for the mixing shaft of a kneader. Utility Model Content

[0003] The purpose of this invention is to provide a sealing structure for the mixing shaft of a kneader, so as to solve the problem mentioned in the background art that the sealing ring needs to be replaced frequently and the replacement time is long, which leads to a decrease in the overall efficiency of the kneader.

[0004] To address the aforementioned problems, the present invention aims to provide a sealing structure for a mixing shaft of a kneader, comprising a base plate, an mounting plate fixedly connected to the upper side of the base plate, two drive shafts rotatably connected to the side of the mounting plate near the cylinder via bearings, and a drive shaft coaxially connected to a rotating shaft at the end away from the mounting plate via a coupling. Two sealing mechanisms are provided on the upper side of the base plate, located between the cylinder and the mounting plate, and are used to seal the gap between the rotating shaft and the cylinder. Each sealing mechanism includes an adjusting component and a supporting component, the adjusting component connecting the supporting component and the base plate together.

[0005] As a further improvement to this technical solution, the adjustment assembly includes a mounting flange rotatably connected to the outside of the drive shaft via a bearing. The mounting flange and the cylinder are symmetrically connected by bolts to two fixing frames. Each fixing frame consists of a semi-circular arc plate and semi-circular rings fixed at both ends of the arc plate. The two fixing frames are located on the outside of the coupling.

[0006] As a further improvement to this technical solution, two semi-circular mounting rings are provided between the two fixing brackets near the cylinder body, and the two fixing brackets press the two combined semi-circular mounting rings against the side wall of the cylinder body.

[0007] As a further improvement to this technical solution, a sealing ring is provided between the two semi-circular mounting rings. The sealing ring is sleeved on the outside of the rotating shaft, and a bifurcated groove is opened on the surface of the sealing ring near the rotating shaft. The sealing ring is used to seal the gap between the rotating shaft and the cylinder body.

[0008] As a further improvement to this technical solution, the surface of the semi-circular mounting ring near the sealing ring is provided with a mounting groove, and the outer side of the sealing ring is located inside the mounting groove. The sealing ring is installed after the two semi-circular mounting rings are assembled together.

[0009] As a further improvement to this technical solution, the adjustment assembly also includes a hydraulic rod fixedly connected to the upper side of the base plate. The piston rod of the hydraulic rod is fixedly connected to the top of the mounting block, and the mounting flange is fixedly connected to the upper side of the mounting block. During the extension and retraction of the piston rod of the hydraulic rod, the mounting block and the mounting flange move in the vertical direction.

[0010] As a further improvement to this technical solution, the support assembly includes a mounting bracket fixedly connected to the side of the mounting block near the cylinder body. The side of the mounting bracket near the cylinder body is bolted to a support bracket, which is used to support the side of the cylinder body near the mounting bracket.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This kneader uses a mixing shaft sealing structure. The sealing ring is installed on the outside of the rotating shaft through a fixing frame and a semi-circular mounting ring. Under the compression of the sealing ring, the position where it contacts the rotating shaft splits to both sides. The sealing ring seals the rotating shaft and the cylinder to reduce material outflow. As the rotating shaft rotates and the sealing ring wears due to friction, the two sides of the forked sealing ring spring back inward, keeping the sealing ring in contact with the rotating shaft at all times. This prolongs the sealing time of the sealing ring and reduces the frequency of sealing ring replacement, thereby improving the efficiency of the kneader.

[0012] 2. This kneader uses a mixing shaft sealing structure. When the sealing ring needs to be replaced, the operator removes the fixing bracket and then disassembles the coupling to separate the rotating shaft and the transmission shaft. Subsequently, the operator disassembles the semi-circular mounting ring to release its fixation on the sealing ring, making it easy to remove and replace the sealing ring with a new one. The sealing ring is installed using the semi-circular mounting ring and then fixed by the fixing bracket, thus completing the sealing ring replacement. This eliminates the need for the operator to remove the protective shell or other protective equipment and use special tools to remove the sealing ring, significantly reducing the time required for sealing ring replacement and further improving the overall efficiency of the kneader. Attached Figure Description

[0013] Figure 1 This is one of the overall structural schematic diagrams of this utility model; Figure 2 This is the second schematic diagram of the overall structure of this utility model; Figure 3 This is a schematic diagram of the sealing mechanism in this utility model; Figure 4 This is one of the cross-sectional views of the sealing mechanism in this utility model; Figure 5 This is one of the cross-sectional views of the sealing mechanism in this utility model; Figure 6 This is an exploded view of the semi-circular mounting ring and sealing ring in this utility model; Figure 7 This is a cross-sectional view of the assembly of the semi-circular mounting ring and the sealing ring in this utility model.

[0014] The meanings of the labels in the diagram are as follows: 1. Base plate; 2. Sealing mechanism; 21. Hydraulic rod; 211. Mounting block; 212. Mounting flange; 213. Fixing bracket; 22. Semi-circular mounting ring; 221. Mounting groove; 222. Sealing ring; 23. Mounting bracket; 231. Support bracket; 3. Cylinder body; 31. Rotating shaft; 32. Agitator blades; 4. Mounting plate; 41. Drive shaft. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Example 1 Please see Figure 1 and Figure 2 As shown, the purpose of this embodiment is to provide a sealing structure for the mixing shaft of a kneader, including a base plate 1. A mounting plate 4 is fixedly connected to the upper side of the base plate 1. Two drive shafts 41 are rotatably connected to the side of the mounting plate 4 near the cylinder 3 via bearings. The end of the drive shaft 41 away from the mounting plate 4 is coaxially connected to the rotating shaft 31 via a coupling. A transmission component is fixedly connected to the top of the side of the mounting plate 4 away from the cylinder 3. The transmission component connects the two drive shafts 41 together. The transmission component includes a mounting shell fixed on the mounting plate 4 and a coupling fixedly connected to the two drive shafts 41. The two sprockets on the drive shaft 41 have different diameters. The two gears are meshed with a chain on their outer sides. A motor and a reducer are fixedly connected to the side of the mounting shell away from the mounting plate 4. The input and output ends of the reducer are coaxially connected to the output shaft of the motor and one of the drive shafts 41 through a coupling. The output shaft of the motor drives the drive shaft 41, the rotating shaft 31 and the stirring blade 32 to rotate through the reducer. Because the two sprockets have different diameters, the two stirring blades 32 rotate at different speeds. The stirring blades 32 stir and mix the material inside the cylinder 3. Two sealing mechanisms 2 are provided on the upper side of the base plate 1. The sealing mechanism 2 is located between the cylinder body 3 and the mounting plate 4. The sealing mechanism 2 is used to seal the gap between the rotating shaft 31 and the cylinder body 3. The sealing mechanism 2 includes an adjustment component and a support component. The adjustment component connects the support component and the base plate 1 together.

[0017] refer to Figure 3 - Figure 7 The adjusting assembly includes a mounting flange 212 rotatably connected to the outside of the drive shaft 41 via bearings. Two fixing brackets 213 are symmetrically connected to the cylinder body 3 via bolts. Each fixing bracket 213 consists of a semi-circular arc plate and semi-circular rings fixed to both ends of the arc plate. The two fixing brackets 213 are located outside the coupling and are assembled into a circular cylinder. There is a gap between the fixing brackets 213 and the coupling and rotating shaft 31 to prevent friction between the rotating shaft 31 and the inner wall of the fixing brackets 213 during rotation, ensuring normal rotation of the rotating shaft 31. The adjusting assembly also includes a hydraulic rod 21 fixedly connected to the upper side of the base plate 1. The hydraulic rod 21... A mounting block 211 is fixedly connected to the top of the piston rod, and a mounting flange 212 is fixedly connected to the upper side of the mounting block 211. During the extension and retraction of the piston rod of the hydraulic rod 21, the mounting block 211 and the mounting flange 212 are moved vertically to adjust the position of the mounting flange 212, ensuring that the mounting flange 212 coincides with the central axis of the drive shaft 41, making it suitable for different models of kneaders. The end of the drive shaft 41 away from the mounting plate 4 passes through the mounting flange 212 and extends outward. The mounting flange 212 supports the end of the drive shaft 41 away from the mounting plate 4, reducing the probability of the end of the drive shaft 41 swaying during rotation, thereby improving the stability of the drive shaft 41 during rotation. Two semi-circular mounting rings 22 are provided between two fixed brackets 213 near the cylinder body 3. The fixed brackets 213 have a limiting groove on the side near the cylinder body 3. The limiting groove is adapted to the cross-sectional size of the semi-circular mounting rings 22. The two fixed brackets 213 press the two combined semi-circular mounting rings 22 against the side wall of the cylinder body 3. At this time, the semi-circular mounting rings 22 are located inside the limiting groove. The limiting groove restricts the position of the semi-circular mounting rings 22, reduces the shaking amplitude of the semi-circular mounting rings 22, improves the stability of the semi-circular mounting rings 22 during use, and prevents the semi-circular mounting rings 22 from separating from the side wall of the cylinder body 3. The surface of the semi-circular mounting rings 22 near the sealing ring 222 has a mounting groove 221. A sealing ring 222 is provided between the two semicircular mounting rings 22. The sealing ring 222 is made of nitrile rubber. The surface of the sealing ring 222 near the rotating shaft 31 has a bifurcated groove. The diameter of the inner circle of the sealing ring 222 is smaller than the diameter of the rotating shaft 31. The outer side of the sealing ring 222 is located inside the mounting groove 221. After the two semicircular mounting rings 22 are assembled together, the sealing ring 222 is installed. The sealing ring 222 is sleeved on the outer side of the rotating shaft 31. The sealing ring 222 is used to seal the gap between the rotating shaft 31 and the cylinder 3. At this time, the part of the sealing ring 222 near the rotating shaft 31 is squeezed by the sealing ring 222 and bifurcates to both sides, so that the sealing ring 222 seals the gap. The seal prevents material inside the cylinder 3 from flowing out through the gap, reducing material waste. When the surface of the seal ring 222 in contact with the rotating shaft 31 wears, the two sides of the forked seal ring 222 spring back inward, keeping the seal ring 222 in contact with the rotating shaft 31, further improving the sealing effect of the seal ring 222 on the gap, extending the sealing time of the seal ring 222, and reducing the replacement frequency of the seal ring 222. Lubricating oil is added between the seal ring 222 and the side wall of the rotating shaft 31 to reduce the friction between the seal ring 222 and the rotating shaft 31, thereby reducing the damage to the seal ring 222 caused by friction and extending the service life of the seal ring 222. When lubricating oil needs to be added to the sealing ring 222, the operator removes the two fixing brackets 213 between the cylinder body 3 and the mounting flange 212, exposing the rotating shaft 31, coupling, semi-circular mounting ring 22, and sealing ring 222. This facilitates the subsequent addition of lubricating oil between the rotating shaft 31 and the sealing ring 222. In addition, when the sealing ring 222 needs to be replaced, the coupling between the rotating shaft 31 and the drive shaft 41 is removed using a wrench, separating the rotating shaft 31 and the drive shaft 41. Subsequently, the operator uses a wrench to disassemble the two semi-circular mounting rings 22, releasing them from the fixing of the sealing ring 222, so that the sealing ring 222 can be replaced. This shortens the operation time required for adding lubricating oil and replacing the sealing ring 222, and improves the overall efficiency of material mixing inside the cylinder body 3.

[0018] refer to Figure 3 - Figure 5 The support assembly includes a mounting bracket 23 fixedly connected to the mounting block 211 on the side near the cylinder body 3. The mounting bracket 23 on the side near the cylinder body 3 is bolted to a support bracket 231. The support bracket 231 is used to support the side of the cylinder body 3 near the mounting bracket 23. During the replacement of the seal ring 222, the bottom of the cylinder body 3 is supported by the mounting bracket 23 and the support bracket 231 to prevent the cylinder body 3 from tilting. This ensures that the central axes of the rotating shaft 31 and the transmission shaft 41 remain aligned during the replacement of the seal ring 222. This facilitates the connection of the rotating shaft 31 and the transmission shaft 41 together by a coupling after the seal ring 222 is replaced, further shortening the time required for the replacement of the seal ring 222.

[0019] When using this device: During the replacement of the seal ring 222, the rotating shaft 31 stops rotating. The staff uses a wrench to loosen the bolts to release the fixing bracket 213, remove the fixing bracket 213 from between the cylinder body 3 and the mounting flange 212, and remove the fixing bracket 213 from the rotating shaft 31, coupling, semi-circular mounting ring 22 and seal ring 222. Subsequently, the workers removed the coupling with a wrench to separate the rotating shaft 31 and the transmission shaft 41. The workers then used a wrench to separate the two assembled semi-circular mounting rings 22, releasing the semi-circular mounting rings 22 from fixing the sealing ring 222. The workers then removed the sealing ring 222 from the rotating shaft 31 and replaced it with a new sealing ring 222. At this time, the new sealing ring 222 is located on the rotating shaft 31 near the cylinder 3. After the sealing ring 222 is replaced, the workers use a wrench and bolts to assemble the two semi-circular mounting rings 22 together to fix the sealing ring 222. The rotating shaft 31 and the transmission shaft 41 are connected together coaxially by a coupling. Then, the workers add lubricating oil between the rotating shaft 31 and the sealing ring 222, and use bolts to install the fixing bracket 213 between the cylinder body 3 and the mounting flange 212, so that the fixing bracket 213 presses the semi-circular mounting ring 22 against the side wall of the cylinder body 3, ensuring that the sealing ring 222 seals the gap between the rotating shaft 31 and the cylinder body 3.

[0020] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A sealing structure for a mixing shaft of a kneader, comprising a base plate (1), wherein a mounting plate (4) is fixedly connected to the upper side of the base plate (1), and two drive shafts (41) are rotatably connected to the side of the mounting plate (4) near the cylinder (3) via bearings, wherein the end of the drive shaft (41) away from the mounting plate (4) is coaxially connected to a rotating shaft (31) via a coupling, characterized in that: The upper side of the base plate (1) is provided with two sealing mechanisms (2). The sealing mechanism (2) is located between the cylinder (3) and the mounting plate (4). The sealing mechanism (2) is used to seal the gap between the rotating shaft (31) and the cylinder (3). The sealing mechanism (2) includes an adjustment component and a support component. The adjustment component connects the support component and the base plate (1) together.

2. The sealing structure for the mixing shaft of a kneader according to claim 1, characterized in that: The adjustment assembly includes a mounting flange (212) rotatably connected to the outside of the drive shaft (41) via a bearing. The mounting flange (212) and the cylinder (3) are symmetrically connected by bolts to two fixing brackets (213). The fixing brackets (213) consist of a semi-circular arc plate and semi-circular rings fixed at both ends of the arc plate. The two fixing brackets (213) are located on the outside of the coupling.

3. A seal for a mixing shaft of a kneader according to claim 2, characterized in that: Two semi-circular mounting rings (22) are provided between the two fixing brackets (213) near the cylinder body (3), and the two fixing brackets (213) press the two combined semi-circular mounting rings (22) against the side wall of the cylinder body (3).

4. A seal for a mixing shaft of a kneader according to claim 3, characterized in that: A sealing ring (222) is provided between the two semi-circular mounting rings (22). The sealing ring (222) is sleeved on the outside of the rotating shaft (31). A bifurcated groove is opened on the surface of the sealing ring (222) near the rotating shaft (31). The sealing ring (222) is used to seal the gap between the rotating shaft (31) and the cylinder (3).

5. A seal for a mixing shaft of a kneader according to claim 4, characterized in that: The semicircular mounting ring (22) has a mounting groove (221) on its surface near the sealing ring (222). The outer side of the sealing ring (222) is located inside the mounting groove (221). The two semicircular mounting rings (22) are assembled together to install the sealing ring (222).

6. The sealing structure for the mixing shaft of a kneader according to claim 2, characterized in that: The adjustment assembly also includes a hydraulic rod (21) fixedly connected to the upper side of the base plate (1). The top of the piston rod of the hydraulic rod (21) is fixedly connected to a mounting block (211). The mounting flange (212) is fixedly connected to the upper side of the mounting block (211). During the extension and retraction process, the piston rod of the hydraulic rod (21) drives the mounting block (211) and the mounting flange (212) to move in the vertical direction.

7. The seal for a kneader shaft as claimed in claim 1, characterized in that: The support assembly includes a mounting bracket (23) fixedly connected to the mounting block (211) on the side near the cylinder body (3). The mounting bracket (23) is bolted to a support bracket (231) on the side near the cylinder body (3). The support bracket (231) is used to support the side of the cylinder body (3) near the mounting bracket (23).

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