Main shaft sealing structure

Abstract

The utility model relates to the technical field of dry-mixed mortar zero-gravity stirrers. The utility model aims to provide a main shaft sealing structure for a dry-mixed mortar agravic mixer. The sealing structure has the advantages of good sealing effect and long service life. According to the technical scheme, the main shaft sealing structure is arranged at the joint of a main shaft and a side plate of a box body; the sealing structure is characterized by comprising a labyrinth sealing piece, a sealing seat, a packing sealing piece, a sealing cavity flange and a packing pressing plate which are arranged on the periphery of the main shaft in a sleeving mode and are sequentially arranged in the axial direction of the main shaft; the labyrinth sealing element is arranged on the inner side of the box body side plate; the sealing seat, the packing sealing piece, the sealing cavity flange and the packing pressure plate are all arranged on the outer side of the box body side plate; the end, close to the sealing seat, of the packing sealing piece is sealed through the second framework oil seal, and the end, close to the sealing cavity flange, of the packing sealing piece is sealed through the packing pressing disc.

Description

Technical Field

[0001] The utility model relates to the technical field of dry mortar gravity-free mixers, in particular to a main shaft sealing structure. Background Art

[0002] Dry mortar refers to a granular or powdered material that is physically mixed in a certain proportion of dried and sieved aggregates (such as quartz sand), inorganic cementitious materials (such as cement) and additives (such as polymers). It is transported to the construction site in bags or bulk and can be used directly after adding water and mixing. It is also called mortar dry powder, dry mix, and dry mix powder. Some construction adhesives also belong to this category. Dry mortar plays a bonding, cushioning, protective and decorative role in the construction industry in a thin layer. It is widely used in construction and decoration projects. In the production process of dry mortar, a mixer is needed to mix the raw materials.

[0003] The existing dry mortar mixer main shaft seal uses packing seal to prevent dust from spilling out. However, as the use time accumulates, more and more dust will enter the packing, which will rub against the rotating main shaft, causing the main shaft to wear. The main shaft wear poses a greater risk to the safe and stable operation of the mixer and reduces the service life of the main shaft. On the other hand, due to the increased friction between the packing and the main shaft, the sealing performance of the packing is weakened, and the packing needs to be replaced frequently, resulting in poor sealing effect. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies of the above-mentioned background technology and provide a main shaft sealing structure that can be used for a dry mortar zero-gravity mixer. The sealing structure should have the advantages of good sealing effect and long service life.

[0005] The technical solution adopted by the utility model is:

[0006] A main shaft sealing structure, which is arranged at the connection between the main shaft and the side plate of the box body; it is characterized in that: the sealing structure includes a labyrinth seal, a sealing seat, a packing seal, a sealing cavity flange and a packing pressure plate which are sleeved on the outer periphery of the main shaft and arranged in sequence along the axial direction of the main shaft; the labyrinth seal is arranged on the inner side of the side plate of the box body; the sealing seat, the packing seal, the sealing cavity flange and the packing pressure plate are all arranged on the outer side of the side plate of the box body; the end of the packing seal close to the sealing seat is sealed by the second skeleton oil seal, and the end of the packing seal close to the sealing cavity flange is sealed by the packing pressure plate.

[0007] A wear-resistant sleeve is sleeved on the main shaft; an interference fit is adopted between the main shaft and the wear-resistant sleeve; the sealing seat, the second skeleton oil seal, the packing seal and the packing pressure plate are all sleeved on the outer periphery of the wear-resistant sleeve.

[0008] An O-ring is installed between one end of the wear-resistant sleeve close to the box side plate and the main shaft.

[0009] The labyrinth seal comprises a dynamic sealing ring and a static sealing ring which are sequentially sleeved on the outer periphery of the main shaft along the radial direction of the main shaft; the dynamic sealing ring is fixedly connected to the main shaft; the static sealing ring is fixedly connected to the side plate of the box body; the dynamic sealing ring and the static sealing ring cooperate to form a labyrinth seal.

[0010] A portion of the dynamic sealing ring close to the side plate of the box body is sleeved on the outer periphery of the wear-resistant sleeve; a first skeleton oil seal is arranged between the dynamic sealing ring and the wear-resistant sleeve.

[0011] The packing seal comprises a packing ring which is sleeved on the outer circumference of the main shaft and forms an annular cavity with the main shaft, and a plurality of packings filled in the annular cavity; an oil cup which is connected to the annular cavity is arranged on the outer wall of the packing ring; and an oil guide ring corresponding to the position of the oil cup is arranged between the packings.

[0012] One end of the packing pressure plate is provided with a first sealing lip that abuts against the outermost packing and fits with the wear-resistant sleeve; the other end of the packing pressure plate is provided with a second sealing lip that fits with the wear-resistant sleeve; a storage cavity is formed among the first sealing lip, the packing pressure plate, the second sealing lip and the wear-resistant sleeve to store lubricating grease; the outer end of the packing pressure plate is sealed by a third skeleton oil seal.

[0013] The packing ring is formed by splicing two semicircular outer rings.

[0014] The static sealing ring and the sealing seat are fixedly connected to the side plate of the box body through the first threaded part; the sealing cavity flange is fixedly connected to the side plate of the box body through the second threaded part; the packing pressure plate is fixedly connected to the sealing cavity flange through the third threaded part; the dynamic sealing ring is fixedly connected to the main shaft through the fourth threaded part.

[0015] The second skeleton oil seal is arranged in the sealing seat.

[0016] The beneficial effects of the utility model are:

[0017] (1) The utility model can effectively prevent the dust in the box from spilling out by combining the labyrinth seal and the packing seal, and has a good sealing effect. The labyrinth seal blocks most of the dust in the box from entering the sealing seat, and the packing seal blocks a small amount of dust passing through the sealing seat. Since only a small amount of dust reaches the packing, the friction between the packing and the wear-resistant sleeve can be greatly reduced, thereby increasing the service life of the packing.

[0018] (2) A wear-resistant sleeve is provided on the main shaft to prevent the packing from directly contacting the main shaft and causing main shaft wear, thereby ensuring safe and stable operation of the mixer and increasing the service life of the main shaft.

[0019] (3) The utility model is provided with three skeleton oil seals to prevent the leakage of lubricating oil. The first skeleton oil seal can prevent the leakage of lubricating oil between the dynamic sealing ring and the static sealing ring; the second skeleton oil seal and the packing pressure plate can prevent the leakage of lubricating oil in the annular cavity of the packing ring; and the third skeleton oil seal can prevent the leakage of lubricating grease in the storage cavity of the packing pressure plate.

[0020] (4) The packing seal of the utility model is composed of two semicircular outer rings spliced ​​together and adopts a split structure, which is convenient for disassembly, assembly and maintenance; an oil guide ring is arranged between the packings, through which the lubricating oil can be transported to the friction part between the packing and the wear-resistant sleeve, thereby reducing the wear of the packing and increasing the service life of the packing.

[0021] (5) An O-ring is provided between the main shaft and the wear-resistant sleeve to prevent small dust particles passing through the labyrinth and the first skeleton oil seal from entering between the main shaft and the wear-resistant sleeve, thereby avoiding wear on the main shaft and increasing the service life of the main shaft.

[0022] (6) A storage cavity is set on the inner wall of the packing plate to store lubricating grease and reduce working resistance during compression. At the same time, a third skeleton oil seal is added at the tail to prevent oil spillage and pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the main structure of the sealing structure of the utility model installed on the main shaft.

[0024] Figure 2 for Figure 1 AA section view in.

[0025] Figure Number:

[0026] 1. Spindle; 1-1. Wear-resistant sleeve; 2. Box side panel; 3. Labyrinth seal; 3-1. Dynamic seal ring; 3-2. Static seal ring; 4. Seal seat; 5. Packing seal; 5-1. Packing ring; 5-2. Packing; 5-3. Oil cup; 5-4. Oil guide ring; 6. Sealing chamber flange; 7. Packing pressure plate; 7-1. First sealing lip; 7-2. Second sealing lip; 8. First skeleton oil seal; 9. Second skeleton oil seal; 10. Third skeleton oil seal; 11. First threaded part; 12. Second threaded part; 13. Third threaded part; 14. Fourth threaded part; 15. O-ring; 16. Oil seal pressure plate; 17. Fifth threaded part; 18. Storage chamber. DETAILED DESCRIPTION

[0027] The following is a further description with reference to the embodiments shown in the accompanying drawings.

[0028] like Figure 1 , Figure 2The main shaft sealing structure shown can be applied to a dry mortar zero-gravity mixer. The sealing structure is installed at the connection between the main shaft 1 and the box side plate 2 to prevent dust in the box from spilling out. The sealing structure includes a labyrinth seal 3, a sealing seat 4, a packing seal 5, a sealing cavity flange 6 and a packing pressure plate 7, which are sleeved on the outer periphery of the main shaft 1 and arranged in sequence along the axial direction of the main shaft 1. The labyrinth seal 3 is arranged on the inner side of the box side plate 2 (i.e. Figure 1 The sealing seat 4, the packing seal 5, the sealing cavity flange 6 and the packing pressure plate 7 are arranged on the outside of the box side plate 2 (ie Figure 1 Specifically, the sealing seat 4 is fixedly connected to the box side plate 2 through a first threaded member 11; the sealing cavity flange 6 is fixedly connected to the box side plate 2 through a second threaded member 12; and the packing pressure plate 7 is fixedly connected to the sealing cavity flange 6 through a third threaded member 13.

[0029] Compared with the existing dry mortar mixer main shaft seal that only uses packing seal, the sealing structure of the utility model uses a combination of labyrinth seal and packing seal, which can effectively prevent the dust in the box from overflowing and has a better sealing effect. The labyrinth seal 3 can block most of the dust in the box from entering the sealing seat 4, and the packing seal 5 can block a small amount of dust entering the sealing seat 4, thereby greatly reducing the friction between the packing and the main shaft 1, increasing the service life of the packing, and reducing the replacement frequency of the packing.

[0030] The labyrinth seal 3 includes a dynamic sealing ring 3-1 and a static sealing ring 3-2; the dynamic sealing ring 3-1 and the static sealing ring 3-2 are sequentially sleeved on the outer periphery of the main shaft 1 along the radial direction of the main shaft 1. The dynamic sealing ring 3-1 is fixedly connected to the main shaft 1 through the fourth threaded member 14, and the static sealing ring 3-2 is fixedly connected to the side plate 2 of the box body through the second threaded member 12. The dynamic sealing ring 3-1 and the static sealing ring 3-2 cooperate to form a labyrinth seal to block most of the dust in the box body, and only a small amount of dust will pass through the labyrinth seal 3 to reach the sealing seat 4. During operation, a small amount of lubricating oil needs to be added between the dynamic sealing ring 3-1 and the static sealing ring 3-2 to reduce the friction between the dynamic sealing ring 3-1 and the static sealing ring 3-2 to extend the service life.

[0031] The main shaft 1 is sleeved with a wear-resistant sleeve 1-1 to prevent the packing seal 5 from directly contacting the main shaft and preventing the packing from wearing the main shaft 1, thereby increasing the service life of the main shaft 1 and ensuring safe and stable operation of the mixer. An interference fit is adopted between the main shaft 1 and the wear-resistant sleeve 1-1.

[0032] In this embodiment, the end of the wear-resistant sleeve 1-1 extends into the dynamic seal ring 3-1, so that a portion of the dynamic seal ring 3-1 close to the box side plate 2 is sleeved on the outer periphery of the wear-resistant sleeve 1-1. In order to prevent the lubricating oil between the dynamic seal ring 3-1 and the static seal ring 3-2 from flowing into the wear-resistant sleeve 1-1 and the main shaft 1 and causing pollution, a first skeleton oil seal 8 is provided between the dynamic seal ring 3-1 and the wear-resistant sleeve 1-1. An O-ring 15 is installed between the end of the wear-resistant sleeve 1-1 close to the box side plate 2 and the main shaft 1 to prevent small particles of dust from passing through the labyrinth seal 3 and the first skeleton oil seal 8 from entering between the main shaft 1 and the wear-resistant sleeve 1-1, thereby avoiding wear on the main shaft 1 and increasing the service life of the main shaft.

[0033] The packing seal 5 includes a packing ring 5-1 and a plurality of packings 5-2. The packing ring 5-1 is sleeved on the outer circumference of the main shaft 1, and an annular cavity is formed between the packing ring 5-1 and the main shaft 1 to fill the packing 5-2. Preferably, the packing ring 5-1 is arranged in a split structure, and the packing ring 5-1 is spliced ​​and fixed by two semicircular outer rings, which is convenient for disassembly and maintenance. The outer wall of the packing ring 5-1 is provided with an oil cup 5-3 connected to the annular cavity. An oil guide ring 5-4 is arranged between the packings, and the lubricating oil can be transported to the friction part between the packing 5-2 and the wear-resistant sleeve 1-1 through the oil guide ring 5-4, which can reduce the wear of the packing 5-2 and increase the service life of the packing 5-2.

[0034] Since the packing 5-2 needs to be added with lubricating oil during operation, in order to prevent the lubricating oil in the packing seal 5 from leaking, a second skeleton oil seal 9 is provided at one end of the packing seal 5 close to the sealing seat 4 for sealing, and the end of the packing seal 5 close to the sealing cavity flange 6 is sealed by the packing pressure plate 7.

[0035] The two ends of the packing pressure plate 7 are respectively provided with a first sealing lip 7-1 and a second sealing lip 7-2 that fit with the wear-resistant sleeve 1-1; the first sealing lip 7-1 abuts against the outermost packing. A storage cavity 18 is formed between the first sealing lip 7-1, the second sealing lip 7-2 and the wear-resistant sleeve 1-1, which is used to store lubricating grease and reduce the working resistance during compression; the outer end of the packing pressure plate 7 (i.e., the end where the second sealing lip 7-2 is provided) is installed with a third skeleton oil seal 10 to prevent the lubricating grease from leaking out and causing pollution. The outer end of the third skeleton oil seal 10 is provided with an oil seal pressure plate 16, which is fixedly connected to the packing pressure plate 7 through a fifth threaded member 17.

[0036] The first skeleton oil seal 8, the sealing seat 4, the second skeleton oil seal 9, the packing seal 5, the packing pressure plate 7, and the third skeleton oil seal 10 are all sleeved on the outer periphery of the wear-resistant sleeve 1-1.

[0037] The installation method of the utility model is as follows:

[0038] First, the wear-resistant sleeve 1-1 and the main shaft 1 are interference fit, and the wear-resistant sleeve 1-1 is fixed at a suitable position on the shaft end. The labyrinth seal 3 is pre-set in the middle position of the main shaft 1. After the main shaft 1 is inserted into the box, the labyrinth seal 3 is moved to the inner side of the box side plate, and the fourth bolt 14 is tightened to fix the dynamic sealing ring 3-1 to the main shaft 1, and the position of the labyrinth seal 3 is positioned. Then, the first skeleton oil seal 8 is sleeved on the wear-resistant sleeve 1-1 and pushed into the dynamic seal ring 3-1 for oil sealing; the seal seat 4 is sleeved on the wear-resistant sleeve 1-1 and moved to the outer side of the box side plate 2, and the first threaded member 11 passes through the seal seat 4, the box side plate 2, and the static seal ring 3-2 in sequence and then tightens; the second skeleton oil seal 9 is sleeved on the wear-resistant sleeve 1-1 and pushed into the seal seat 4; the split packing ring 5-1 is sleeved on the outer periphery of the wear-resistant sleeve 1-1 and close to the seal seat 4, and the packing 5-2 is filled into the packing ring 5-1. Next, the sealing cavity flange 6 is sleeved on the wear-resistant sleeve 1-1, and the second threaded member 12 passes through the sealing cavity flange 6, the seal seat 4, the box side plate 2, and the static seal ring 3-2 in sequence and then tightens. Finally, the packing pressure plate 7 is sleeved on the wear-resistant sleeve 1-1, and the third threaded member 13 passes through the packing pressure plate 7 and the sealing chamber flange 6 and is tightened, so that the first sealing lip 7-1 is tightly against the outermost packing; the third skeleton oil seal 10 is sleeved on the wear-resistant sleeve 1-1 and pushed into the packing pressure plate 7, and fits tightly with the second sealing lip 7-2; the oil seal pressure plate 16 is fixedly connected to the packing pressure plate 7 through the fifth threaded member 17. In this way, the sealing of the connection between the main shaft 1 and the box side plate 2 can be completed.

[0039] During operation, the labyrinth seal 3 blocks most of the dust inside the box, and only a small amount of dust passes through the labyrinth to reach the sealing seat 4. The packing seal 5 blocks the small amount of dust passing through the sealing seat 4. Due to the combination of the labyrinth seal 3 and the packing seal 5, the dust inside the box can be effectively prevented from overflowing, and the sealing effect is good. Since only a small amount of dust reaches the packing, the friction between the packing 5-2 and the wear-resistant sleeve 1-1 can be greatly reduced, the service life of the packing 5-2 can be increased, and the replacement frequency of the packing 5-2 can be reduced. In addition, the sealing structure is provided with three skeleton oil seals, which can avoid pollution caused by leakage of lubricating oil during operation, and the wear-resistant sleeve 1-1 is installed on the main shaft 1, and the packing 5-2 will not directly contact and rub with the main shaft 1, which can increase the service life of the main shaft 1 and avoid affecting the safe and stable operation of the mixer due to the wear of the main shaft 1.

[0040] It should be noted that the application of the sealing structure of the utility model is not limited to the dry mortar zero-gravity mixer, but also includes other equipment or machinery that requires the main shaft to be sealed, such as concrete mixers, food mixers, chemical equipment, etc. It is only necessary to install and apply the sealing structure of the utility model according to the actual situation of the specific equipment or machinery.

[0041] The utility model has a simple structure, is easy to install and maintain, can greatly improve the service life of the main shaft 1 and the packing 5-2, effectively prevents dust from overflowing from the box, and can prevent lubricating oil from leaking, has a good sealing effect, and is suitable for popularization and application.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A main shaft sealing structure, which is arranged at the connection between the main shaft (1) and the side plate (2) of the box body; characterized in that: The sealing structure comprises a labyrinth seal (3), a sealing seat (4), a packing seal (5), a sealing cavity flange (6) and a packing pressure plate (7) which are sleeved on the outer periphery of the main shaft (1) and arranged in sequence along the axial direction of the main shaft (1); the labyrinth seal (3) is arranged on the inner side of the box side plate (2); the sealing seat (4), the packing seal (5), the sealing cavity flange (6) and the packing pressure plate (7) are all arranged on the outer side of the box side plate (2); the end of the packing seal (5) close to the sealing seat (4) is sealed by the second skeleton oil seal (9), and the end of the packing seal (5) close to the sealing cavity flange (6) is sealed by the packing pressure plate (7).

2. The main shaft sealing structure according to claim 1, characterized in that: A wear-resistant sleeve (1-1) is sleeved on the main shaft (1); an interference fit is adopted between the main shaft (1) and the wear-resistant sleeve (1-1); the sealing seat (4), the second skeleton oil seal (9), the packing seal (5) and the packing pressure plate (7) are all sleeved on the outer periphery of the wear-resistant sleeve (1-1).

3. The main shaft sealing structure according to claim 2, characterized in that: An O-ring (15) is installed between the end of the wear-resistant sleeve (1-1) close to the box side plate (2) and the main shaft.

4. The main shaft sealing structure according to claim 2, characterized in that: The labyrinth seal (3) comprises a dynamic seal ring (3-1) and a static seal ring (3-2) which are sequentially sleeved on the outer circumference of the main shaft along the radial direction of the main shaft; the dynamic seal ring (3-1) is fixedly connected to the main shaft (1); the static seal ring (3-2) is fixedly connected to the box side plate (2); the dynamic seal ring (3-1) and the static seal ring (3-2) cooperate to form a labyrinth seal.

5. The main shaft sealing structure according to claim 4, characterized in that: A portion of the dynamic sealing ring (3-1) close to the box side plate (2) is sleeved on the outer periphery of the wear-resistant sleeve (1-1); a first skeleton oil seal (8) is arranged between the dynamic sealing ring (3-1) and the wear-resistant sleeve (1-1).

6. The main shaft sealing structure according to any one of claims 2 to 5, characterized in that: The packing seal (5) comprises a packing ring (5-1) sleeved on the outer circumference of a main shaft (1) and forming an annular cavity with the main shaft, and a plurality of packings (5-2) filled in the annular cavity; an oil cup (5-3) communicating with the annular cavity is arranged on the outer wall of the packing ring (5-1); and an oil guide ring (5-4) corresponding to the position of the oil cup is arranged between the packings.

7. The main shaft sealing structure according to claim 6, characterized in that: The packing ring (5-1) is formed by splicing two semicircular outer rings.

8. The main shaft sealing structure according to claim 6, characterized in that: One end of the packing pressure plate (7) is provided with a first sealing lip (7-1) that abuts against the outermost packing (5-2) and fits with the wear-resistant sleeve (1-1); the other end of the packing pressure plate (7) is provided with a second sealing lip (7-2) that fits with the wear-resistant sleeve (1-1); a storage cavity (18) is formed between the first sealing lip (7-1), the packing pressure plate (7), the second sealing lip (7-2) and the wear-resistant sleeve (1-1) for storing lubricating grease; the outer end of the packing pressure plate is sealed by a third skeleton oil seal (10); the outer end of the third skeleton oil seal (10) is provided with an oil seal pressure plate (16) fixedly connected to the packing pressure plate (7).

9. The main shaft sealing structure according to claim 4 or 5, characterized in that: The static sealing ring (3-2) and the sealing seat (4) are fixedly connected to the box side plate (2) via a first threaded member (11); the sealing cavity flange (6) is fixedly connected to the box side plate (2) via a second threaded member (12); the packing pressure plate (7) is fixedly connected to the sealing cavity flange (6) via a third threaded member (13); and the dynamic sealing ring (3-1) is fixedly connected to the main shaft (1) via a fourth threaded member (14).

10. The main shaft sealing structure according to claim 1, characterized in that: The second skeleton oil seal (9) is arranged in the sealing seat (4).

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