End cover sealing structure of cement screw conveyor

Abstract

The utility model relates to the technical field of aerated concrete production, and provides a cement screw conveyor end cover sealing structure which comprises an end cover body, a rotating shaft, a bearing pack, a first framework oil seal, a second framework oil seal, a first gland and a second gland. The end cover sealing structure of the cement spiral conveyor is suitable for connection between a driving unit and a spiral conveying unit of the spiral conveyor, rotary sealing is effectively and stably achieved, and compared with an existing packing sealing structure, the step of replacing filler can be reduced, and the production cost is reduced; compared with an existing bearing transmission structure, oil filling operation is simpler, the oil filling requirement for the bearing set, the first framework oil seal and the second framework oil seal can be met at the same time through one oil filling nozzle, operation such as shell disassembling and blank cap disassembling is not needed during oil filling, convenience and rapidness are achieved, and the maintenance efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of aerated concrete production, in particular to a sealing structure for the end cover of a cement screw conveyor. Background Technique

[0002] In the production process of aerated concrete products, a screw conveyor is used to convey concrete (i.e., cement). In the current cement screw conveyor, a packing seal or a bearing drive seal structure is mostly used to achieve the rotary seal between the rotating shaft and the end cover;

[0003] The packing seal is a way of forming a seal by pressing a filling material into a gasket where two metal surfaces contact. In the packing seal, the filling material is usually a soft and malleable metal or non-metal material. When two measuring tool surfaces contact, the filling material will fill the gap between them. As the filling material is compressed, they will start to flow and adapt to the shape of the surface. The characteristic of this sealing method is to rely on the flow of the packing material to achieve the seal. Therefore, it is more suitable for the stress characteristics of screw conveying. However, the filling material in the packing seal needs to be replaced regularly. The short replacement period (up to 3 - 5 months, as short as 1 - 2 months) increases the production cost, and during the installation and disassembly of the filling material, the operation is inconvenient and time-consuming.

[0004] For example, a bearing drive seal such as a screw conveyor bearing seal device with the publication number CN204384328U uses the cooperation of a bearing and a skeleton oil seal to achieve rotary sealing, and two oil filling holes are also provided to inject oil into the two skeleton oil seals respectively; however, when performing the oil filling operation, the external blank cover needs to be removed first to expose the oil filling holes, which is inconvenient to operate; and one of the oil filling holes is located inside the bolt conveyor, making it inconvenient to fill oil; in addition, this sealing device cannot be used for the connection between the drive unit and the screw conveying unit. Content of the Utility Model

[0005] In view of this, the utility model provides a sealing structure for the end cover of a cement screw conveyor, aiming to achieve the rotary seal between the drive unit and the screw conveying unit in the screw conveyor and facilitate maintenance.

[0006] The technical solution of the utility model is realized as follows:

[0007] A sealing structure for the end cover of a cement screw conveyor, comprising:

[0008] An end cover body, a rotating shaft, a bearing group, a first skeleton oil seal, a second skeleton oil seal, a first gland, and a second gland;

[0009] The end cover body includes a first flange and a second flange that are relatively spaced apart. Between the first flange and the second flange, a plurality of support rods are provided, and the plurality of support rods are arranged at intervals in the circumferential direction. One end of the second flange close to the first flange extends out an installation cylinder, an axial shaft hole is formed in the installation cylinder, an oil filling nozzle is arranged outside the installation cylinder, the oil filling nozzle is communicated with the shaft hole, and a channel is formed between two adjacent support rods.

[0010] The rotating shaft is arranged in the shaft hole, the bearing set is arranged between the rotating shaft and the shaft hole, the first skeleton oil seal and the second skeleton oil seal are both arranged in the bearing and are respectively arranged at both ends of the bearing set, and the first gland and the second gland are respectively fixed at both ends of the shaft hole.

[0011] As a further optional solution, the bearing set includes a ball bearing and a thrust bearing.

[0012] As a further optional solution, the end of the second flange where the installation cylinder is arranged is defined as the first end, and the end of the second flange far from the installation cylinder is defined as the second end. The interior of the shaft hole is sequentially formed with a first hole section, a second hole section and a third hole section from the first end to the second end. The diameter of the second hole section is smaller than the diameters of the first hole section and the third hole section. A first positioning shoulder is formed between the first hole section and the second hole section, and a second positioning shoulder is formed between the second hole section and the third hole section. The bearing set and the first skeleton oil seal are arranged in the first hole section, and the second skeleton oil seal is arranged in the third hole section.

[0013] As a further optional solution, the oil filling nozzle is communicated with the first hole section.

[0014] As a further optional solution, the first gland is connected to the first end of the installation cylinder by bolts, and the second gland is connected to the second end of the second flange by bolts.

[0015] As a further optional solution, there are at least four support rods, the thickness of the support rods is equal to or greater than the thicknesses of the first flange and the second flange, and the width of the support rods is at least three times their thickness.

[0016] The end cover sealing structure of the cement screw conveyor of the present application has at least the following beneficial effects compared with the prior art:

[0017] The end cover sealing structure of this cement screw conveyor is applicable to the connection between the driving unit and the screw conveying unit of the screw conveyor, effectively and stably achieving rotary sealing. Compared with the existing packing sealing structure, it can reduce the steps of replacing the packing and lower the production cost; compared with the existing bearing transmission structure, the refueling operation is simpler. Through one refueling nozzle, the oil injection requirements for the bearing group, the first skeleton oil seal, and the second skeleton oil seal can be satisfied simultaneously. When refueling, there is no need to disassemble the housing, gland cover, etc., which is convenient and fast and improves the maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic structural diagram of an end cover sealing structure of a cement screw conveyor according to an embodiment of the present invention;

[0020] Figure 2 It is an exploded view of an end cover sealing structure of a cement screw conveyor according to an embodiment of the present invention;

[0021] Figure 3 It is a cross-sectional view of the end cover body;

[0022] Figure 4 It is a mating schematic diagram of the rotating shaft passing through the end cover body;

[0023] Figure 5 It is a distribution schematic diagram of multiple support rods.

[0024] In the figure: 1. End cover body; 11. First flange; 12. Second flange; 13. Support rod; 131. Channel; 14. Installation cylinder; 141. Shaft hole; 141a. First hole section; 141b. Second hole section; 141c. Third hole section; 141d. First positioning shoulder; 141e. Second positioning shoulder; 15. Refueling nozzle; 2. Rotating shaft; 3. Bearing group; 31. Ball bearing; 32. Thrust bearing; 4. First skeleton oil seal; 5. Second skeleton oil seal; 6. First gland; 7. Second gland. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The technical solutions in the embodiments of the present utility model will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0026] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0027] In the present utility model, unless otherwise clearly defined and limited, the terms "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0028] Reference Figures 1-5 , an embodiment of the present utility model shows a sealing structure for the end cover of a cement screw conveyor, including an end cover body 1, a rotating shaft 2, a bearing group 3, a first skeleton oil seal 4, a second skeleton oil seal 5, a first gland 6, and a second gland 7; the end cover body 1 includes a first flange 11 and a second flange 12 that are relatively spaced apart, and a plurality of support rods 13 are arranged between the first flange 11 and the second flange 12, and the plurality of support rods 13 are arranged at intervals in the circumferential direction; one end of the second flange 12 close to the first flange 11 extends out an installation cylinder 14, an axial shaft hole 141 is formed in the installation cylinder 14, an oil filling nozzle 15 is arranged outside the installation cylinder 14, the oil filling nozzle 15 is communicated with the shaft hole 141, and a channel 131 is formed between two adjacent support rods 13; the rotating shaft 2 is inserted into the shaft hole 141, the bearing group 3 is arranged between the rotating shaft 2 and the shaft hole 141, the first skeleton oil seal 4 and the second skeleton oil seal 5 are both arranged in the bearing and are respectively arranged at both ends of the bearing group 3, and the first gland 6 and the second gland 7 are respectively fixed at both ends of the shaft hole 141.

[0029] Among them, the first flange 11 can be used to connect the reducer housing of the driving unit (not shown) in the screw conveyor, and the second flange 12 can be used to connect the housing of the screw conveying unit (not shown) in the screw conveyor. One end of the rotating shaft 2 is in transmission connection with the reducer of the driving unit, and the other end of the rotating shaft 2 can be connected to the screw conveyor shaft in the screw conveying unit through a coupling; the bearing group 3 is used to make the rotating shaft 2 rotate stably, and the first skeleton oil seal 4 and the second skeleton oil seal 5 can prevent cement and dust from entering the shaft hole 141. On the one hand, it avoids cement leakage, and on the other hand, it avoids affecting the rotation smoothness between the bearing group 3 and the rotating shaft 2, ensuring the stable operation of the cement screw conveyor.

[0030] When lubricating oil needs to be filled, the lubricating oil can be injected into the grease nipple 15 through the channel 131. On the one hand, the bearing group 3 is lubricated to reduce friction and wear. On the other hand, the lubricating oil forms an oil film between the first skeleton oil seal 4 / the second skeleton oil seal 5 and the rotating shaft 2. This oil film has the characteristics of fluid lubrication and prevents the leakage of the working medium (i.e., cement) under the action of the liquid surface tension. In this embodiment, through one grease nipple 15, the oil filling requirements of the bearing group 3, the first skeleton oil seal 4 and the second skeleton oil seal 5 can be satisfied at the same time. When filling oil, there is no need to perform operations such as disassembling the housing and the blind cover, which is convenient and fast and improves the maintenance efficiency.

[0031] Specifically, the above solution, the bearing group 3 includes a ball bearing 31 and a thrust bearing 32. Among them, the ball bearing 31 mainly bears the load of the rotating shaft 2 in a rolling manner, and the thrust bearing 32 mainly bears the load of the rotating shaft 2 in a sliding manner. By using the ball bearing 31 and the thrust bearing 32 in combination, it can better adapt to the load of the spiral action borne by the rotating shaft 2.

[0032] In some embodiments, to make the installation and positioning of the first skeleton oil seal 4, the bearing group 3 and the second skeleton oil seal 5 easier, as Figure 3 and Figure 4 shown, the end of the second flange 12 where the mounting cylinder 14 is provided is defined as the first end, and the end of the second flange 12 away from the mounting cylinder 14 is defined as the second end; a first hole section 141a, a second hole section 141b and a third hole section 141c are sequentially formed inside the shaft hole 141 from the first end to the second end. The diameter of the second hole section 141b is smaller than the diameters of the first hole section 141a and the third hole section 141c. A first positioning shoulder 141d is formed between the first hole section 141a and the second hole section 141b, and a second positioning shoulder 141e is formed between the second hole section 141b and the third hole section 141c. The bearing group 3 and the first skeleton oil seal 4 are arranged in the first hole section 141a, and the second skeleton oil seal 5 is arranged in the third hole section 141c.

[0033] Among them, the outer ring of the bearing in the bearing group 3 abuts against the first positioning shoulder 141d, and the inner ring of the bearing is fixedly sleeved on the rotating shaft 2, facilitating the rapid positioning of the rotating shaft 2. The second skeleton oil seal 5 is quickly positioned through the second positioning shoulder 141e; in addition, the first gland 6 is connected to the first end of the mounting cylinder 14 by bolts, and the second gland 7 is connected to the second end of the second flange 12 by bolts, ensuring the stable installation of the first skeleton oil seal 4, the bearing group 3, and the second skeleton oil seal 5.

[0034] Specifically in the above solution, the grease nipple 15 communicates with the first hole section 141a. When lubricating oil is injected through the grease nipple 15, the bearing group 3 and the first skeleton oil seal 4 in the first hole section 141a can be lubricated with the lubricating oil. There is a certain gap between the second hole section 141b and the rotating shaft 2, and the lubricating oil in the first hole section 141a enters the third hole section 141c through this gap to lubricate the second skeleton oil seal 5.

[0035] Specifically in the above solution, to ensure the structural stability of the end cover body 1, as Figure 5 shown, there are at least four support rods 13. The thickness of the support rods 13 is equal to or greater than the thickness of the first flange 11 and the second flange 12, and the width of the support rods 13 is at least three times its thickness. In this embodiment, the support rods 13 are arc-shaped metal plates, and the width of the support rods 13 can be regarded as its arc length.

[0036] In summary, the present utility model discloses an end cover sealing structure of a cement screw conveyor. This end cover sealing structure of the cement screw conveyor is applicable to the connection between the driving unit and the screw conveying unit of the screw conveyor, effectively and stably achieving rotary sealing. Compared with the existing packing sealing structure, it can reduce the steps of replacing the packing and lower the production cost; compared with the existing bearing transmission structure, the refueling operation is simpler. Through one grease nipple 15, it can simultaneously meet the oil injection requirements for the bearing group 3, the first skeleton oil seal 4, and the second skeleton oil seal 5. When refueling, there is no need to perform operations such as disassembling the housing and the blank cover, which is convenient and fast, improving the maintenance efficiency.

[0037] In the above embodiments, the descriptions of each embodiment have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0038] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A sealing structure for the end cover of a cement screw conveyor, characterized in that Comprising: A end cover body, a rotating shaft, a bearing set, a first skeleton oil seal, a second skeleton oil seal, a first gland, and a second gland; The end cover body includes a first flange and a second flange that are relatively spaced apart. A plurality of support rods are provided between the first flange and the second flange, and the plurality of support rods are arranged at intervals in the circumferential direction. One end of the second flange close to the first flange extends out an installation cylinder, an axial hole is formed in the installation cylinder, an oil filling nozzle is provided outside the installation cylinder, the oil filling nozzle communicates with the axial hole, and a channel is formed between two adjacent support rods; The rotating shaft is arranged in the axial hole, the bearing set is arranged between the rotating shaft and the axial hole, the first skeleton oil seal and the second skeleton oil seal are both arranged in the bearing and are respectively arranged at both ends of the bearing set, and the first gland and the second gland are respectively fixed at both ends of the axial hole.

2. The end cover sealing structure of the cement screw conveyor according to claim 1, wherein, The bearing set includes a ball bearing and a thrust bearing.

3. The end cover sealing structure of the cement screw conveyor according to claim 1 or 2, characterized in that, Define the end of the second flange with the installation cylinder as the first end, and the end of the second flange far from the installation cylinder as the second end; The interior of the axial hole sequentially forms a first hole section, a second hole section, and a third hole section from the first end to the second end. The diameter of the second hole section is smaller than the diameters of the first hole section and the third hole section. A first positioning shoulder is formed between the first hole section and the second hole section, and a second positioning shoulder is formed between the second hole section and the third hole section. The bearing set and the first skeleton oil seal are arranged in the first hole section, and the second skeleton oil seal is arranged in the third hole section.

4. The end cover sealing structure of the cement screw conveyor according to claim 3, characterized in that, The oil filling nozzle communicates with the first hole section.

5. The end cover sealing structure of the cement screw conveyor according to claim 3, characterized in that, The first gland is connected to the first end of the installation cylinder by bolts, and the second gland is connected to the second end of the second flange by bolts.

6. The end cover sealing structure of the cement screw conveyor according to claim 1, characterized in that, There are at least four support rods, the thickness of the support rods is equal to or greater than the thicknesses of the first flange and the second flange, and the width of the support rods is at least three times their thickness.

Images