Sealing device for rotary screen main shaft

Abstract

The sealing device comprises a stuffing box arranged on the main shaft in a sleeving mode, the two ends of the main shaft are rotationally connected with a shaft supporting bearing seat and a screening machine shell correspondingly, the stuffing box is embedded in the screening machine shell, and a stuffing sealing cavity is formed between the main shaft and the stuffing box. A plurality of fillers are arranged in the filler sealing cavity and sequentially arranged on the main shaft in a stacked and sleeved mode in the axial direction of the main shaft, the main shaft is further sleeved with a filler box gland located at the outer end of the filler box, and the end, close to the filler box, of the filler box gland extends into the filler sealing cavity and is connected with the filler on the outermost side in a blocking mode. Compared with the prior art, the packing box has the advantages that the packing box structure is ingeniously designed, the multi-layer graphite oil immersion packing is adopted, and an adjusting and gas sealing mechanism is additionally arranged, so that the sealing performance, the operation continuity and the maintenance efficiency of the drum screen are remarkably improved, and material leakage is effectively prevented.

Description

Technical Field

[0001] This utility model relates to the field of drum screen sealing technology, specifically to a sealing device for the main shaft of a drum screen. Background Technology

[0002] Rotary drum screens are widely used machines in sorting technology. They separate particles by size using a drum mounted on the casing, offering high sorting accuracy. The drum of a rotary drum screen is typically divided into several sections, each with screen holes of the same diameter, arranged from small to large to accommodate materials of different particle sizes.

[0003] A rotary drum screen mainly consists of a motor, reducer, drum assembly, frame, sealing cover, and inlet / outlet. The sealing device is a crucial component of the rotary drum screen, used to prevent material leakage from the shaft seal. (See attached image) Figure 1 As shown, wool felt 15 is currently widely used for sealing, and then sealed with a sealing cap 16. After a certain period of use, wool felt 15 is prone to failure, leading to material leakage and high dust levels in the work environment. After failure, the machine needs to be shut down, the sealing cap removed, and the wool felt replaced. Frequent shutdowns for maintenance not only affect the environment and equipment stability but also seriously impact production capacity. Utility Model Content

[0004] To solve the above problems, the present invention provides a sealing device for the main shaft of a drum screen, the core of which lies in the stuffing box structure cleverly installed on the main shaft.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows: a sealing device for the main shaft of a drum screen, including a stuffing box sleeved on the main shaft, the two ends of the main shaft being rotatably connected to a shaft support bearing seat and a screening machine housing, respectively, the stuffing box being embedded in the screening machine housing, a stuffing sealing cavity being formed between the main shaft and the stuffing box, a plurality of packings being provided in the stuffing sealing cavity and the plurality of packings being stacked and sleeved on the main shaft in sequence along the axial direction of the main shaft, a stuffing box cover located at the outer end of the stuffing box being sleeved on the main shaft, and the end of the stuffing box cover near the stuffing box extending into the stuffing sealing cavity and blocking the outermost packing.

[0006] Furthermore, the outer circumference of the stuffing box is provided with several adjusting bolts, the stuffing box cover is provided with positioning holes corresponding to the adjusting bolts, and the stuffing box cover is sleeved on the adjusting bolts through the positioning holes. The adjusting bolts are also threaded with adjusting nuts for tightening the stuffing box.

[0007] Furthermore, the inner ring of the stuffing box cover is provided with several gas sealing grooves, and the gas sealing grooves and the main shaft form a gas sealing cavity. The end of the stuffing box cover away from the stuffing box is provided with an air inlet channel that communicates with the several gas sealing grooves.

[0008] Further, the air inlet of the air inlet channel is provided with an air pipe quick connector.

[0009] Further, the inner ring of the packing gland is further provided with a first O-shaped sealing ring at the outer end of the gas sealing cavity.

[0010] Further, the outer ring of the packing gland is further provided with a second O-shaped sealing ring in the packing sealing cavity.

[0011] Further, the packing is graphite oil-immersed packing.

[0012] In the above technical solution, the technical effects and advantages of the utility model are that: first, the packing gland structure is ingeniously installed on the main shaft and embedded in the screen shell, which not only saves installation space, but also facilitates the installation and replacement of the packing, and significantly improves the maintenance efficiency. Compared with the traditional wool felt sealing method, the introduction of the multi-layer graphite oil-immersed packing fundamentally solves the problems of easy wear and frequent replacement, and greatly improves the sealing performance and operation continuity of the drum screen.

[0013] Secondly, the packing gland is improved, and adjusting bolts and adjusting nuts are added, so that the pre-tightening force of the packing can be easily adjusted to ensure that the sealing effect is optimal. This design not only improves the reliability of the seal, but also enables the packing to be quickly replaced after wear, greatly reducing maintenance costs and downtime.

[0014] Furthermore, the inner ring of the packing gland is further provided with a first O-shaped sealing ring at the outer end of the gas sealing cavity.

[0015] In summary, the novel drum screen material sealing device of the application is superior to the prior art in terms of structural design, material selection, and maintenance efficiency, and has brought significant improvement in the sealing performance and service life of the drum screen. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic diagram of the sealing structure in the prior art.

[0017] Figure 2 is a schematic diagram of the sealing device for the main shaft of the drum screen.

[0018] Figure 3 is a schematic diagram of the internal structure of the sealing device for the main shaft of the drum screen.

[0019] Figure 4 is Figure 3A structure of the middle A is shown in a zoomed-in view.

[0020] As shown in the figure: 1, main shaft, 2, stuffing box, 3, shaft support bearing seat, 4, screen housing, 5, filler, 6, stuffing box gland, 7, adjusting bolt, 8, adjusting nut, 9, gas seal groove, 10, gas seal cavity, 11, gas inlet channel, 12, gas pipe quick connector, 13, first O-shaped sealing ring, 14, second O-shaped sealing ring, 15, wool felt, 16, sealing cover. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0022] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0023] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0024] Furthermore, the technical solutions of each embodiment of the present application can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the scope of protection required by the present application.

[0025] Referring to the drawings Figure 2 -Appendix Figure 3The application provides a sealing device for a drum screen main shaft, which is characterized by a cleverly installed packing gland 2 structure on the main shaft 1. The two ends of the main shaft 1 are rotatably connected to the shaft support bearing seat 3 and the screening machine shell 4, and the packing gland 2 is cleverly embedded in the screening machine shell 4 to form a packing sealing cavity together with the main shaft 1. In the application, the packing gland 2 can be designed to be embedded in the screening machine shell 4 by welding, which can save the installation space of the packing gland 2 while ensuring the distance between the original shaft support bearing seat 3 and the screening machine shell 4, thereby facilitating the installation and replacement of the packing 5. In the packing sealing cavity, multiple layers of packing 5 are carefully stacked along the axial direction of the main shaft 1 to form a solid sealing barrier. The introduction of the multiple layers of packing 5 fundamentally solves the problem of frequent replacement of the traditional wool felt seal which is easy to wear and affects the production efficiency, and significantly improves the sealing performance and operation continuity of the drum screen.

[0026] In another embodiment, the packing gland 2 is further improved, and a plurality of adjusting bolts 7 are cleverly added to the outer circumference of the packing gland 2. The adjusting bolts 7 not only provide accurate positioning points for the packing gland cover 6, but also ensure the concentricity of the packing gland cover 6 and the packing gland through the cooperating positioning holes. Further, the adjusting nuts 8 threaded on the adjusting bolts 7 enable the application to easily adjust the pre-tightening force of the packing 5, ensuring that the sealing effect reaches the best. When the packing 5 is worn out due to long-term use, simply rotating the adjusting nuts 8 counterclockwise can easily release the packing gland cover 6, realizing the quick replacement of the packing 5, and greatly reducing the maintenance cost and downtime.

[0027] Referring to the drawings Figure 4 In another embodiment of the application, the inner circle of the packing gland cover 6 is further provided with three gas sealing grooves 9, and the three gas sealing grooves 9 and the main shaft 1 form a gas sealing cavity 10. The end of the packing gland cover 6 away from the packing gland 2 is provided with an air inlet channel 11 communicating with the three gas sealing grooves 9, and the air inlet of the air inlet channel 11 is provided with an air pipe quick connector 12. The application is connected to the gas source through the air pipe quick connector 12, and when the positive pressure gas is introduced into the gas sealing grooves 9 and the gas sealing cavity 10 through the air inlet channel 11, the positive pressure sealing can be realized, forming an additional sealing barrier, which greatly improves the reliability of the sealing and the material leakage prevention ability.

[0028] In order to ensure the integrity of the gas sealing cavity 10, the inner circle of the packing gland cover 6 is further provided with a first O-shaped sealing ring 13 located at the outer end of the gas sealing cavity 10, and the design of the first O-shaped sealing ring 13 can prevent the gas in the gas sealing cavity 10 from leaking out. The outer circle of the packing gland cover 6 is further provided with a second O-shaped sealing ring 14 located in the packing sealing cavity, and the second O-shaped sealing ring 14 can seal the gap between the packing gland cover 6 and the inner wall of the packing gland 2.

[0029] Finally, the graphite oil-impregnated packing is particularly selected as the packing 5. When the packing 5 is subjected to pressure, not only can it deform in the longitudinal direction to form a tight seal, but also can extrude the internal impregnated graphite oil to form an additional lubricating and sealing layer, thereby greatly improving the sealing efficiency and durability and effectively preventing material from leaking from the tiny gap between the main shaft and the screen housing, thereby providing a solid guarantee for the long-term stable operation of the trommel screen.

[0030] In the specific use process, first, the connection stability of the shaft support bearing seat 3 and the screen housing 4 is checked under the premise that the trommel screen is stopped and the power is disconnected. The packing gland 2 is pre-embedded on the screen housing 4 and is fixedly connected with the screen housing 4 in a welding manner, and the packing gland 2 and the main shaft 1 jointly form a packing seal cavity. Next, a plurality of graphite oil-impregnated packings 5 are prepared. These packings 5 have excellent deformation ability and sealing performance and can tightly fit the surface of the main shaft 1 when the main shaft 1 rotates. The packings 5 are stacked into a ring layer by layer and are inserted into the packing seal cavity. After the installation of the packings 5 is completed, the packings 5 are pre-tightened by using the adjusting bolt 7 and the adjusting nut 8, and the packing gland 6 is tightly fitted on the packings by rotating the adjusting nut 8 clockwise. The purpose of this step is to form an effective sealing barrier to prevent material leakage. At the same time, the graphite oil-impregnated packing can extrude graphite oil when subjected to pressure to form an additional lubricating and sealing layer, thereby further improving the sealing efficiency and durability. Then, the gas pipe quick connector 12 is connected with the gas source, and the positive pressure gas is introduced into the gas sealing groove 9 and the gas sealing cavity 10. The introduction of the positive pressure gas can form an additional sealing barrier, thereby greatly improving the reliability of the sealing and the material leakage prevention ability.

[0031] The above describes the present application and its embodiments, which are not limited, and the embodiments shown in the drawings are only one of the embodiments of the present application, and the actual structure is not limited thereto. In summary, if a person skilled in the art is inspired thereby, without departing from the creative purpose of the present application, similar structural modes and embodiments can be designed without creativity, which should all belong to the protection scope of the present application.

Claims

1. A sealing device for a main shaft of a drum screen, comprising a stuffing box (2) sleeved on the main shaft (1), both ends of the main shaft (1) are rotatably connected with a shaft support bearing seat (3) and a screen housing (4) respectively, characterized in that, The stuffing box (2) is embedded in the screening machine housing (4). A stuffing sealing cavity is formed between the main shaft (1) and the stuffing box (2). A number of packings (5) are provided in the stuffing sealing cavity and the packings (5) are stacked and sleeved on the main shaft (1) in sequence along the axial direction of the main shaft (1). A stuffing box cover (6) located at the outer end of the stuffing box (2) is also sleeved on the main shaft (1). The end of the stuffing box cover (6) near the stuffing box (2) extends into the stuffing sealing cavity and blocks the outermost packing (5).

2. A seal for a trommel shaft as claimed in claim 1, wherein, The outer circumference of the stuffing box (2) is provided with several adjusting bolts (7). The stuffing box cover (6) is provided with positioning holes corresponding to the adjusting bolts (7), and the stuffing box cover (6) is sleeved on the adjusting bolts (7) through the positioning holes. The adjusting bolts (7) are also threaded with adjusting nuts (8) for pressing the stuffing box (2).

3. A sealing device for a drum screen main shaft according to claim 1 or 2, characterized in that, The inner ring of the stuffing gland cover (6) is also provided with a number of gas sealing grooves (9), and the number of gas sealing grooves (9) and the main shaft (1) form a gas sealing cavity (10). The end of the stuffing gland cover (6) away from the stuffing gland (2) is provided with an air inlet channel (11) that communicates with the number of gas sealing grooves (9).

4. A seal for a trommel shaft as claimed in claim 3, wherein, The air inlet of the air intake channel (11) is equipped with a quick-connect air pipe connector (12).

5. A seal for a trommel shaft as claimed in claim 4, wherein, The inner ring of the stuffing gland cover (6) is also provided with a first O-ring (13) located at the outer end of the gas sealing cavity (10).

6. A seal for a trommel shaft as claimed in claim 5, wherein, The outer ring of the stuffing gland cover (6) is also provided with a second O-ring (14) located in the stuffing sealing cavity.

7. A seal for a trommel shaft as claimed in claim 6, wherein, The filler (5) is a graphite oil-impregnated filler.

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