Sealing structure for main shaft of kneading machine

Abstract

The utility model relates to a sealing structure for a main shaft of a kneading machine. The sealing structure comprises a polytetrafluoroethylene sealing ring, a polytetrafluoroethylene woven packing and a labyrinth seal, the polytetrafluoroethylene sealing ring and the polytetrafluoroethylene braided packing are installed on a shaft neck of a main shaft of the kneading machine, the polytetrafluoroethylene sealing ring is located in front of the polytetrafluoroethylene braided packing and is a static seal, and a gap delta is formed between the polytetrafluoroethylene sealing ring and the shaft neck of the main shaft of the kneading machine through accurate control or running-in; the shaft neck of the kneading machine main shaft is further provided with a movable ring and a static ring, the movable ring and the static ring are located between the polytetrafluoroethylene sealing ring and the polytetrafluoroethylene woven packing, the static ring is arranged on the outer side of the movable ring in a sleeved mode, and an axial labyrinth is formed between the static ring and the movable ring to form a labyrinth seal. The sealing structure can block leakage of materials in a container, achieves the effect of sealing the shaft neck of the main shaft of the kneading machine, and meanwhile can effectively prevent abrasive dust generated by abrasion of packing forming sealing from invading the kneading machine to cause pollution.

Description

Technical Field

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

[0002] Traditional kneaders also employ a multi-seal + labyrinth seal design for their main shaft sealing structure (such as patent 202020836462.8, a kneader main shaft seal). Their design focuses on preventing leakage, but they cannot effectively prevent wear debris generated by the packing material from entering the kneader and causing contamination. Utility Model Content

[0003] This invention proposes a sealing structure for the main shaft of a kneader, which can block material leakage from the container and achieve the effect of sealing the journal of the kneader's main shaft. At the same time, it can effectively prevent the wear debris generated by the wear of the packing that constitutes the seal from entering the kneader and causing pollution.

[0004] A sealing structure for a kneader spindle includes a polytetrafluoroethylene (PTFE) sealing ring, a PTFE braided packing, and a labyrinth seal. The PTFE sealing ring and the PTFE braided packing are installed on the journal of the kneader spindle. The PTFE sealing ring is located in front of the PTFE braided packing and forms a static seal. The gap δ between the PTFE sealing ring and the journal of the kneader spindle is precisely controlled or formed through running-in. The journal of the kneader spindle also has a moving ring and a stationary ring installed between the moving ring and the PTFE braided packing. The stationary ring is sleeved on the outside of the moving ring, and an axial labyrinth is formed between the stationary ring and the moving ring, constituting a labyrinth seal.

[0005] Further refining the above technical solution, the moving ring is a half-ring, and the stationary ring is a polytetrafluoroethylene cup-shaped stationary ring.

[0006] Further refining the above technical solution, a half-connecting disc is fixed to the kneader hopper by bolts, and the polytetrafluoroethylene sealing ring and stationary ring are embedded in the half-connecting disc.

[0007] To further refine the above technical solution, the mounting tongue and groove of the half-connector disc is smaller than the axial labyrinth gap.

[0008] The advantages of this invention are its reasonable design and simple structure. The extremely small gap δ between the PTFE seal and the journal of the kneader's main shaft effectively serves as a material stop and primary seal; the smaller the value, the better the effect of preventing material or grinding debris from entering the kneader. The labyrinth seal design disrupts the direct trajectory of grinding debris, forcing it to remain within the labyrinth and preventing it from entering the kneader and causing contamination. (Due to the guaranteed manufacturing precision, the total amount of grinding debris is limited, and maintenance and cleaning can be performed according to the conventional three-month or six-month maintenance period.) Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the installation of the sealing structure of the kneader main shaft.

[0010] Figure 2 yes Figure 1 A magnified view of a portion of the image.

[0011] The diagram shows the sealing structure 1, PTFE sealing ring 1-1, PTFE braided packing 1-2, labyrinth seal 1-3, half-ring 1-3-1, PTFE cup-shaped stationary ring 1-3-2, axial labyrinth 1-3-3, half-connecting disc 1-4; kneader main shaft 2; kneader hopper 3. Detailed Implementation

[0012] like Figure 1-2 As shown, a kneader main shaft sealing structure, sealing structure 1 includes a polytetrafluoroethylene (PTFE) sealing ring 1-1, a PTFE braided packing 1-2, and a labyrinth seal 1-3; the PTFE sealing ring 1-1 and the PTFE braided packing 1-2 are installed on the journal of the kneader main shaft 2, with the PTFE sealing ring 1-1 located in front of the PTFE braided packing 1-2, forming a static seal. The gap δ between the PTFE sealing ring 1-1 and the journal of the kneader main shaft 2 is precisely controlled or formed through running-in. The journal of the kneader main shaft 2 is also equipped with a half-rotating ring 1-3-1 and a polytetrafluoroethylene (PTFE) cup-shaped stationary ring 1-3-2. The half-rotating ring 1-3-1 and the PTFE cup-shaped stationary ring 1-3-2 are located between the PTFE sealing ring 1-1 and the PTFE braided packing 1-2. The PTFE cup-shaped stationary ring 1-3-2 is sleeved on the outside of the half-rotating ring 1-3-1, and an axial labyrinth 1-3-3 is formed between it and the half-rotating ring 1-3-1, which constitutes the labyrinth seal 1-3.

[0013] The half-connecting disc 1-4 is fixed to the kneader hopper 3 by bolts. The polytetrafluoroethylene sealing ring 1-1 and the polytetrafluoroethylene cup-shaped stationary ring 1-3-2 are embedded in the half-connecting disc 1-4. The installation tongue and groove of the half-connecting disc 1-4 is smaller than the axial labyrinth 1-3-3 gap.

[0014] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A sealing structure for the main shaft of a kneader, the sealing structure comprising a polytetrafluoroethylene (PTFE) sealing ring, a PTFE braided packing, and a labyrinth seal; characterized in that, The PTFE sealing ring and PTFE braided packing are installed on the journal of the kneader main shaft. The PTFE sealing ring is located in front of the PTFE braided packing and forms a static seal. The gap δ between the PTFE sealing ring and the journal of the kneader main shaft is precisely controlled or formed through running-in. The journal of the kneader main shaft is also equipped with a moving ring and a stationary ring. The moving ring and the stationary ring are located between the PTFE sealing ring and the PTFE braided packing. The stationary ring is sleeved on the outside of the moving ring, and an axial labyrinth is formed between the stationary ring and the moving ring to form a labyrinth seal.

2. The sealing structure for the main shaft of a kneader according to claim 1, characterized in that, The moving ring is a half-ring, and the stationary ring is a polytetrafluoroethylene cup-shaped stationary ring.

3. The kneader spindle sealing structure according to claim 1, characterized in that, A half-connecting disc is fixed to the kneader hopper by bolts, and the polytetrafluoroethylene sealing ring and stationary ring are embedded in the half-connecting disc.

4. The kneader spindle sealing structure according to claim 3, characterized in that, The mounting tongue and groove of the HAF connector is smaller than the axial labyrinth gap.

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