Sealing device of kneading equipment

Abstract

The utility model belongs to the technical field of energetic material processing, and particularly discloses a kneading equipment sealing device which is used for energetic material processing. The sealing device for the transmission shaft of the energetic material kneading equipment adopts the design of the fibrofelt, the sealing seat and the packing gland, and is made of a non-ignition material, the transmission shaft rotates and is in sealing friction with the fibrofelt during kneading work, and the sealing device has good characteristics of wear resistance, high temperature resistance, static prevention, flame retardance and the like and is made of a soft material, so that the sealing effect is good. The transmission shaft cannot generate instant high temperature or static electricity, so that the condition of igniting an explosive point of an energetic material medicament cannot be met, and the production safety is ensured while the sealing effect is achieved; the device is simple in structure, low in machining precision requirement, convenient to maintain, low in cost, short in time and reliable in production and use performance, and all parts are matched without occupying other spaces.

Description

Technical Field

[0001] This utility model belongs to the field of energetic material processing technology, and specifically discloses a sealing device for kneading equipment. Background Technology

[0002] A kneader is an ideal device for kneading and polymerizing high-viscosity, elasto-plastic materials. Currently, most conventional weapons use chemical energy as their propulsion. The manufacturing process using a kneader involves mixing these energetic materials, adding a certain amount of solvent, and processing them through stirring and kneading. The kneading method uses a horizontal bottom kneading system. The top of the kneader is open, and two stirring and kneading paddles extend through the bottom of the kneader. During the kneading process, the stirring and kneading paddles rotate in opposite directions, continuously stirring and compressing the material. This kneading method is highly efficient, produces good kneading results, and is suitable for processing most energetic materials.

[0003] However, the bottom kneading method concentrates energetic materials at the bottom. Two agitator drive shafts, passing through the bottom of the kneader, are fixedly connected to the side wall of the kneader using bearing bushes. The bearing bushes and drive shafts cooperate to provide sealing and connection. During rotation, friction between the drive shaft and bearing bushes is inevitable. Energetic materials are mostly in powder form, easily entering the gaps between the shaft and bearing bushes. Furthermore, energetic materials have high friction sensitivity, and this friction can easily ignite the energetic materials, leading to fire and explosion. In addition, the solvents added during the kneading process are mostly organic solvents, making it difficult to achieve a good seal using only the drive shaft and bearing bushes. This sealing connection method is difficult to meet process and safety requirements; therefore, a new sealing device needs to be designed.

[0004] Therefore, there is a need to develop equipment for extruding energetic materials to overcome the above technical problems. Utility Model Content

[0005] This utility model is achieved through the following technical solution:

[0006] A sealing device suitable for kneading equipment of energetic materials includes fiber felt 3, sealing seat 4, and packing gland 5;

[0007] The drive shaft 2 of the kneading equipment passes through the shaft hole 1 in the cylinder wall of the kneading equipment. The diameter of the shaft hole 1 in the cylinder wall is larger than the diameter of the drive shaft 2 and does not contact the drive shaft 2.

[0008] A sealing seat 4 is fixed on the outside of the cylinder wall through-shaft hole 1; the sealing seat 4 is a cylindrical shell with an annular end face inside one end of the opening and an annular surface outside the other end of the opening, forming a small-diameter end and a large-diameter end respectively; the small-diameter end is connected to the cylinder wall and corresponds to the small-diameter of the cylinder wall through-shaft hole 1.

[0009] The outer side of the sealing seat 4 is connected to the packing gland 5; the packing gland 5 is a cylindrical shell with an open end and an outer ring surface; the ring surface of the packing gland 5 corresponds to the outer ring surface of the large diameter end of the sealing seat 4, and the two are connected by a connector.

[0010] The drive shaft 2 passes through the through hole in the middle of the sealing seat 4 and the packing gland 5; the non-circular end of the packing gland 5 is inserted into the cavity of the sealing seat 4, and the cavity of the sealing seat 4 and the non-circular end of the packing gland 5 are filled with fiber felt 3; the fiber felt 3 is in contact with the drive shaft 2, and the drive shaft 2 rubs against the fiber felt 3 when it rotates.

[0011] Preferably, the fiber felt 3 is wool felt.

[0012] Preferably, the fiber felt 3 is integrally formed using a non-warp and weft interlacing process.

[0013] Preferably, the contact surface between the fiber felt 3 and the drive shaft 2 is coated with lubricating oil.

[0014] Preferably, the annular surface of the packing gland 5 is a flange, and the flange has through holes that correspond to the screw holes on the outer annular surface of the sealing seat 4.

[0015] Furthermore, the packing gland 5 and the sealing seat 4 are connected by bolts to compact the fiber felt 3.

[0016] Preferably, the sealing seat 4 and the packing gland 5 are made of non-sparking metal.

[0017] Furthermore, the non-sparking metal is copper or stainless steel.

[0018] Working principle:

[0019] When the kneader is working, the fiber felt 3, which is filled between the packing gland 5, the sealing seat 4 and the drive shaft 2, is in contact with the drive shaft 2. After the fiber felt 3 is compressed, some of the solvent added to the kneader will evaporate or soak into the sealing fiber felt 3 along the gap of the drive shaft 2. The fiber felt 3 will expand slightly after being soaked in the solvent, and the sealing effect will be better when it is in contact with the drive shaft 2, the packing gland 5 and the sealing seat 4. The energetic material powder is less likely to enter the gap of the transmission mechanism.

[0020] The beneficial effects of this utility model are:

[0021] The sealing device of the drive shaft of the energetic material kneading equipment designed in this utility model adopts a design of fiber felt, sealing seat, and packing gland, and is made of non-sparking material. During the kneading operation, the drive shaft rotates and rubs against the fiber felt seal. Because the fiber felt has good properties such as wear resistance, high temperature resistance, antistatic properties, and flame retardancy, and is a soft material, the drive shaft will not generate instantaneous high temperature or static electricity, thus not reaching the conditions for igniting the explosive point of the energetic material agent. This achieves the sealing effect while ensuring the safety of production. The device has a simple structure, does not require high processing precision, and the fit between the parts does not occupy other space. It is easy to maintain, low in cost, and quick to install. Its performance in production use is reliable. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the sealing device structure of this utility model;

[0023] Figure 2 This is a schematic cross-sectional view of the packing gland structure of this utility model;

[0024] Figure 3 This is a schematic diagram of the sealing seat structure of this utility model. Detailed Implementation

[0025] To better illustrate the purpose, technical solution, and advantages of this utility model, further explanation is provided below in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments are only used to illustrate the technical effects of this utility model and are not intended to limit the scope of protection of this utility model.

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] Example 1

[0028] A sealing device suitable for kneading equipment of energetic materials includes fiber felt 3, sealing seat 4, and packing gland 5;

[0029] The drive shaft 2 of the kneading equipment passes through the shaft hole 1 in the cylinder wall of the kneading equipment. The diameter of the shaft hole 1 in the cylinder wall is larger than the diameter of the drive shaft 2 and does not contact the drive shaft 2.

[0030] A sealing seat 4 is fixed on the outside of the cylinder wall through-shaft hole 1; the sealing seat 4 is a cylindrical shell with an annular end face inside one end of the opening and an annular surface outside the other end of the opening, forming a small-diameter end and a large-diameter end respectively; the small-diameter end is connected to the cylinder wall and corresponds to the small-diameter of the cylinder wall through-shaft hole 1.

[0031] The outer side of the sealing seat 4 is connected to the packing gland 5; the packing gland 5 is a cylindrical shell with an open end and an outer ring surface; the ring surface of the packing gland 5 corresponds to the outer ring surface of the large diameter end of the sealing seat 4, and the two are connected by a connector.

[0032] The drive shaft 2 passes through the through hole in the middle of the sealing seat 4 and the packing gland 5; the non-circular end of the packing gland 5 is inserted into the cavity of the sealing seat 4, and the cavity of the sealing seat 4 and the non-circular end of the packing gland 5 are filled with fiber felt 3; the fiber felt 3 is in contact with the drive shaft 2, and the drive shaft 2 rubs against the fiber felt 3 when it rotates.

[0033] The fiber felt 3 is wool felt, integrally formed using a non-warp and weft interlacing process. Lubricating oil is applied to the contact surface between the fiber felt 3 and the drive shaft 2.

[0034] The annular surface of the packing gland 5 is a flange, and the flange has through holes that correspond to the screw holes on the outer annular surface of the sealing seat 4. The packing gland 5 and the sealing seat 4 are connected by bolts to compact the fiber felt 3.

[0035] The sealing seat 4 is made of copper, and the packing gland 5 is made of stainless steel.

[0036] The packing gland 5 and the sealing seat 4 work together to press the wool felt together to achieve a sealing effect. The wool felt is integrally formed by a non-weft interlacing process, with high density and strong toughness. It has the characteristics of wear resistance, high temperature resistance, anti-static and flame retardant properties. When in use, a certain amount of lubricating oil is applied to the contact surface between the wool felt and the drive shaft 2 for lubrication. The sealing effect has been tested and found to be reliable. Only periodic inspection and replacement of the wool felt are required.

[0037] The above description is merely a specific example of this utility model and does not constitute any limitation on this utility model. Those skilled in the art, after understanding the content and principles of this utility model, may make various modifications and changes in form and detail without departing from the principles and structure of this utility model; however, these modifications and changes based on the concept of this utility model are still within the protection scope of the claims of this utility model.

Claims

1. A sealing device suitable for kneading equipment of energetic materials, characterized in that, Includes fiber felt (3), sealing seat (4), and packing gland (5); The drive shaft (2) of the kneading device passes through the shaft hole (1) in the cylinder wall of the kneading device. The diameter of the shaft hole (1) in the cylinder wall is larger than the diameter of the drive shaft (2) and does not contact the drive shaft (2). A sealing seat (4) is fixed on the outside of the cylinder wall through-shaft hole (1); the sealing seat (4) is a cylindrical shell with an annular end face inside one end and an annular surface outside the other end, forming a small diameter end and a large diameter end respectively; the small diameter end is connected to the cylinder wall and corresponds to the small diameter of the cylinder wall through-shaft hole (1); The sealing seat (4) is connected to the packing gland (5) on the outside; the packing gland (5) is a cylindrical shell with an annular surface on the outside of one end of the opening; the annular surface of the packing gland (5) corresponds to the annular surface on the outside of the large diameter end of the sealing seat (4), and the two are connected by a connector. The drive shaft (2) passes through the middle through hole of the sealing seat (4) and the packing gland (5); the non-circular end of the packing gland (5) is inserted into the cavity of the sealing seat (4), and a fiber felt (3) is provided between the cavity of the sealing seat (4) and the non-circular end of the packing gland (5); the fiber felt (3) is in contact with the drive shaft (2), and the drive shaft (2) rubs against the fiber felt (3) when it rotates.

2. The sealing device for kneading equipment of energetic materials according to claim 1, characterized in that, The fiber felt (3) is wool felt.

3. The sealing device for kneading equipment of energetic materials according to claim 1, characterized in that, The fiber felt (3) is integrally formed by a non-warp and weft interlacing process.

4. The sealing device for kneading equipment of energetic materials according to claim 1, characterized in that, Lubricating oil is applied to the contact surface between the fiber felt (3) and the drive shaft (2).

5. The sealing device for kneading equipment of energetic materials according to claim 1, characterized in that, The annular surface of the packing gland (5) is a flange, and the flange has through holes that correspond to the screw holes on the outer annular surface of the sealing seat (4).

6. The sealing device for kneading equipment of energetic materials according to claim 1, characterized in that, The packing gland (5) and the sealing seat (4) are connected by bolts.

7. The sealing device for kneading equipment of energetic materials according to claim 1, characterized in that, The sealing seat (4) and packing gland (5) are made of non-sparking metal.

8. The sealing device for kneading equipment of energetic materials according to claim 7, characterized in that, The non-sparking metal is copper or stainless steel.

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