A shaft end sealing device for a dual-shaft mixed acid machine

Abstract

The utility model discloses a kind of double-shaft mixed acid machine shaft end sealing devices, it contains mixed acid machine tank and stirring shaft, one end of the stirring shaft penetrates the tank end plate of the mixed acid machine tank, spiral blade is provided on the stirring shaft, a dynamic sealing ring is fixed on the stirring shaft of the tank end plate inside, a sealing seat is sleeved on the stirring shaft of the tank end plate outside, the sealing seat is connected with the tank end plate by connecting bolt, the contact surface of dynamic sealing ring and sealing seat uses the labyrinth seal structure of convex and concave alternation, sealing cavity is arranged between the sealing seat and the stirring shaft, sealing packing is arranged in the sealing cavity, the outer end surface of the sealing packing is in contact with sealing gland, the sealing gland is connected with the sealing seat by gland bolt. The utility model uses the triple sealing of mechanical+labyrinth+packing, guarantees the reliability of sealing, avoids material leakage, simultaneously reduces use and maintenance cost.

Description

Technical Field

[0001] This utility model relates to a rotating shaft sealing technology, and in particular to a shaft end sealing device for a dual-shaft acid mixing machine. Background Technology

[0002] The twin-shaft acid mixer is mainly used in the lithium battery industry for mixing acidified materials during the acid roasting process of spodumene, lepidolite powder, etc. The materials mixed in the acid mixer have a very fine particle size, around 200 mesh, and the environment is acidic. Conventional single-filler seals cannot meet the sealing requirements and will leak from the sealing cap. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of existing calibration technology and provide a shaft end sealing device for a biaxial mixing acid machine that is reasonably designed and adopts multiple seals.

[0004] The technical solution of this utility model is: A shaft end sealing device for a dual-shaft acid mixing machine includes an acid mixing machine tank and a stirring shaft. One end of the stirring shaft penetrates the end plate of the acid mixing machine tank. The stirring shaft is equipped with helical blades. A dynamic sealing ring is fixedly fitted on the stirring shaft inside the end plate of the tank. A sealing seat is fitted on the stirring shaft outside the end plate of the tank. The sealing seat is connected to the end plate of the tank by connecting bolts. The contact surface between the dynamic sealing ring and the sealing seat adopts a labyrinth-type sealing structure with alternating convex and concave shapes. A sealing cavity is provided between the sealing seat and the stirring shaft. Sealing packing is provided in the sealing cavity. The outer end face of the sealing packing contacts a sealing gland. The sealing gland is connected to the sealing seat by gland bolts, and the inner end of the sealing gland can press against the sealing packing.

[0005] Furthermore: the dynamic sealing ring is provided with screw holes, and fastening screws are used to fix the dynamic sealing ring on the stirring shaft through the screw holes. There are at least two screw holes along the circumference.

[0006] Furthermore, a polytetrafluoroethylene (PTFE) wear-resistant plate is provided on the labyrinthine sealing surface of the dynamic sealing ring. The shape of the PTFE wear-resistant plate matches the dynamic sealing ring. A spring clamping mechanism is provided axially through the dynamic sealing ring, which enables the PTFE wear-resistant plate to form a contact seal with the sealing seat.

[0007] The beneficial effects of this utility model are: 1. This utility model adopts a triple seal of mechanical + labyrinth + packing, which ensures the reliability of the seal, avoids material leakage, and reduces the cost of use and maintenance.

[0008] 2. This utility model uses polytetrafluoroethylene wear-resistant plate as the contact surface, which has high wear resistance and long service life. During use, there is no need to frequently replace easily worn parts, thus reducing the frequency of maintenance.

[0009] 3. This utility model utilizes a spring clamping mechanism to adjust the axial position of the polytetrafluoroethylene wear-resistant plate, thereby improving the sealing effect.

[0010] 4. This utility model utilizes a sealing cap to press the sealing packing, ensuring close contact between the sealing packing and the stirring shaft, thereby guaranteeing the sealing effect of the stirring shaft.

[0011] 5. This utility model has a reasonable design, good sealing effect, wide applicability, is easy to promote and implement, and has good economic benefits. Attached Figure Description

[0012] Figure 1 This is a structural diagram of a shaft end sealing device for a biaxial acid mixing machine; Figure 2 for Figure 1 View from A in the middle. Detailed Implementation

[0013] Example 1: See Figure 1 -- Figure 2 In the figure, 1-mixing acid tank, 2-stirring shaft, 3-sealing cover, 4-sealing seat, 5-sealing packing, 6-spiral blade, 7-dynamic sealing ring, 8-polytetrafluoroethylene wear-resistant plate, 9-spring clamping mechanism.

[0014] A shaft end sealing device for a dual-shaft acid mixing machine includes an acid mixing tank 1 and a stirring shaft 2. One end of the stirring shaft 2 penetrates the end plate of the acid mixing tank 1. Spiral blades 6 are installed on the stirring shaft 2 to quickly push away the material and prevent material accumulation at the end of the tank. A dynamic sealing ring 7 is fixedly fitted on the stirring shaft 2 inside the end plate of the tank, and the dynamic sealing ring 7 rotates with the stirring shaft 2. A sealing seat 4 is fitted on the stirring shaft 2 outside the end plate of the tank, and the sealing seat 4 is connected to the end plate of the tank by connecting bolts (the connecting bolts are not shown in the figure). As the stirring shaft 2 rotates, the contact surface of the dynamic sealing ring 7 and the sealing seat 4 adopts a labyrinthine sealing structure with alternating convex and concave shapes. A sealing cavity is provided between the sealing seat 4 and the stirring shaft 2, and a sealing packing 5 (which can be graphite packing) is provided in the sealing cavity. The outer end face of the sealing packing 5 contacts the sealing gland 3. The sealing gland 3 is connected to the sealing seat 4 by gland bolts, and the inner end of the sealing gland can press against the sealing packing 5. The pressure on the sealing packing 5 can be adjusted and the sealing effect changed by adjusting the engagement length of the gland bolts as needed.

[0015] Preferred solution: The dynamic sealing ring 7 is provided with screw holes, and the fastening screws fix the dynamic sealing ring 7 to the stirring shaft 2 through the screw holes, which can be disassembled and assembled. There are at least two screw holes along the circumference.

[0016] Furthermore: a polytetrafluoroethylene wear-resistant plate 8 is provided on the labyrinth-type sealing surface of the dynamic sealing ring 7. The shape of the polytetrafluoroethylene wear-resistant plate 8 matches the dynamic sealing ring 7. A spring clamping mechanism 9 is provided through the dynamic sealing ring along the axial direction. The spring clamping mechanism 9 enables the polytetrafluoroethylene wear-resistant plate 8 to form a contact seal with the sealing seat 4.

[0017] The structure of the spring clamping mechanism 9 is as follows: a threaded hole is machined on the outer end face of the dynamic sealing ring 7 perpendicular to the axial direction. A spring is installed inside the threaded hole, and a set screw is installed on the outer side. The spring clamps the polytetrafluoroethylene wear-resistant plate 8 to form a contact seal with the sealing seat 4. This mechanism is not afraid of acidic substances. The problem can also be solved by material issues, such as by adding a polytetrafluoroethylene sleeve to the end of the threaded hole.

[0018] When in use, first set the above components on the stirring shaft 2, ensure that the dynamic sealing ring 7 is firmly connected to the stirring shaft 2, adjust the inner extension position of the sealing gland 3 so that the sealing packing 5 expands under pressure and fits tightly with the stirring shaft 2 to improve the sealing effect.

[0019] Labyrinth seals, through material selection, are suitable for acidic environments inside tanks and are easy to maintain, requiring no frequent replacement of worn parts.

[0020] Example 2: This example is basically the same as Example 1, and the similarities will not be repeated. The difference is that: no polytetrafluoroethylene wear-resistant plate is set, and the dynamic sealing ring and sealing seat are made of wear-resistant material, simplifying the structure.

[0021] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications made based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A shaft end sealing device for a dual-shaft acid mixing machine, comprising an acid mixing machine tank and a stirring shaft, one end of the stirring shaft penetrating the tank end plate of the acid mixing machine tank, and the stirring shaft being provided with helical blades, characterized in that: A dynamic sealing ring is fixedly fitted on the stirring shaft inside the end plate of the tank body, and a sealing seat is fitted on the stirring shaft outside the end plate of the tank body. The sealing seat is connected to the end plate of the tank body by connecting bolts. The contact surface of the dynamic sealing ring and the sealing seat adopts a labyrinth-type sealing structure with alternating convex and concave shapes. A sealing cavity is provided between the sealing seat and the stirring shaft. A sealing filler is provided in the sealing cavity. The outer end face of the sealing filler contacts the sealing gland. The sealing gland is connected to the sealing seat by gland bolts, and the inner end of the sealing gland can press against the sealing filler.

2. The shaft end sealing device of a twin-shaft acid mixing machine according to claim 1, characterized in that: The dynamic sealing ring is provided with screw holes, and fastening screws are used to fix the dynamic sealing ring to the stirring shaft through the screw holes. There are at least two screw holes along the circumference.

3. The shaft end sealing device for a twin-shaft acid mixing machine according to claim 1, characterized in that: A polytetrafluoroethylene (PTFE) wear-resistant plate is provided on the labyrinthine sealing surface of the dynamic sealing ring. The shape of the PTFE wear-resistant plate matches the dynamic sealing ring. A spring clamping mechanism is provided axially through the dynamic sealing ring, which enables the PTFE wear-resistant plate to form a contact seal with the sealing seat.

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