Sealing device of middle roller type crusher

Abstract

The utility model discloses a sealing device of a middle roller crusher, which comprises a roller crusher body, the roller crusher body comprises a roller part, a closed cavity is formed on the peripheral side of one end of the roller part, and a tooth roller shaft is arranged at the axis of the roller part; the pneumatic sealing device is arranged on the peripheral side of the end, where the cavity is formed, of the tooth roller shaft, the pneumatic sealing device comprises a pneumatic sealing piece, a ventilation cavity is formed in the pneumatic sealing piece, and the ventilation cavity penetrates through the closed cavity. The pneumatic sealing device is used for controlling the flowing direction of compressed air to offset impact of high-temperature dust, the high-temperature dust is prevented from scouring the tooth roller shaft and corroding the sealing device, and meanwhile the compressed air in the pneumatic sealing device can also reduce the temperature of the surface of the tooth roller shaft.

Description

Technical Field

[0001] The utility model relates to the technical field of cement production equipment, in particular to a sealing device for a central roller crusher. Background Art

[0002] The existing central roller crusher is used in the process of cement clinker production. This crusher has less maintenance and relatively stable equipment operation. As shown in the attached Figure 1 figure, the central roller crusher mainly consists of a roller part 11, a housing part 12, a support device 13, a sealing device 14, and a transmission device 15. The roller part 11 includes a toothed roller shaft 111 at the axis. The toothed roller shaft 111 is divided into left and right sections according to different diameters. The left section is the enclosed working space 16 of the central roller crusher. The right section is connected with a transmission device 15 and a support device 13 from left to right in sequence. A limiting member 112 with a U-shaped cross-section is arranged on the outer peripheral side of the right end of the left section of the toothed roller shaft 111. A sealing housing 122 is arranged in the recess of the limiting member 112. A sealing space 121 is formed between the sealing housing 122 and the right end of the left section of the toothed roller shaft 111. The support device 13 arranged at the middle position of the right section of the toothed roller shaft 111 includes a bearing arranged on the outer peripheral side of the toothed roller shaft 111 and a bearing seat 132 fixed on the outer peripheral side of the bearing.

[0003] Generally, the sealing space 121 in the central roller crusher should be under negative pressure. A large gap between the sealing housing 122 and the limiting member 112 will not cause material leakage. Even if a small amount of dust leaks out, it will gather in the sealing space 121 and then fall from below the toothed roller shaft 111 below, without affecting the use of the toothed roller shaft 111. However, in order to increase the secondary air temperature, the first-row fan has a small draft in the central roller crusher. At the same time, the air intake at the kiln head is far from the roller crusher position, resulting in positive pressure around the roller crusher from time to time. This causes the pressure in the working space 16 to be higher than the pressure in the sealing space 121. As a result, the dust in the working space 16 will pass through the gap between the sealing housing 122 and the limiting member 112 and enter the sealing space 121. After repeated times, the high-temperature dust in the sealing space 121 will gather, continuously scour the toothed roller shaft 111, and gradually corrode the toothed roller shaft 111 by the high-temperature dust, affecting its use. In addition, when positive pressure appears around the roller crusher, the high-temperature dust will continuously erode the sealing device 14, causing the sealing device 14 to age and wear rapidly. As a result, the high-temperature dust can overflow from the sealing space 121 and continuously gather towards the bearing seat 132, eroding the bearing seat 132 and the bearing 131, affecting the service life. Summary of the Utility Model

[0004] The utility model provides a sealing device for a central roller crusher, which can solve the problem that when there is positive pressure in the sealing space, high-temperature dust scours the toothed roller shaft and the sealing device at a certain speed, affecting their service lives, and even damaging the sealing device and then overflowing from the sealing space and gathering at the support device, wearing the bearing and the bearing seat. The technical solution is as follows:

[0005] A sealing device for a center roll crusher, characterized in that it includes a roll crusher body, the roll crusher body includes a roll part and a housing part, a sealing space is formed on the circumferential side at one end of the housing part, and a toothed roll shaft is arranged at the axis of the roll part; a pneumatic sealing device is arranged at one end of the toothed roll shaft close to the sealing space, the pneumatic sealing device includes a pneumatic seal, and the pneumatic seal forms a ventilation cavity, and the ventilation cavity penetrates the sealing space.

[0006] Preferably, the pneumatic sealing device further includes an auxiliary seal, a groove is formed on one side of the auxiliary seal close to the pneumatic seal, and the groove can cover part of the ventilation cavity along the radial projection direction of the toothed roll shaft.

[0007] Preferably, the pneumatic seal is arranged at one end of the toothed roll shaft to form a tortuous air duct with the groove, one end of the air duct communicates with the ventilation cavity, and the other end of the air duct communicates with the sealing space.

[0008] Preferably, it further includes an oil seal device arranged on the circumferential side of the toothed roll shaft close to one end of the pneumatic sealing device, the oil seal device is also arranged on the side of the pneumatic sealing device away from the toothed roll shaft, and the oil seal device includes a sealing ring arranged on the circumferential side of the toothed roll shaft.

[0009] Preferably, an oil injection channel is formed along the radial direction of the sealing ring of the oil seal device, and the oil injection channel communicates the outside with the sealing ring.

[0010] From the above technical solutions, the present utility model has the following beneficial effects:

[0011] The present utility model controls the flow direction of compressed air through the pneumatic sealing device to offset the impact of high-temperature dust, avoiding the erosion of the high-temperature dust on the toothed roll shaft and the corrosion of the sealing device. At the same time, the compressed air in the pneumatic sealing device can also reduce the surface temperature of the toothed roll shaft. The present utility model can further improve the sealing effect of the present utility model on high-temperature dust by being able to inject lubricating oil so that the sealing ring of the oil seal device can withstand the high temperature of the high-temperature dust. Description of the Drawings

[0012] Figure 1 It is a schematic structural diagram of a partial cross-sectional view of an existing center roll crusher;

[0013] Figure 2 It is a schematic structural diagram of a partial cross-sectional view of a center roll crusher installed with an embodiment of the present utility model;

[0014] Figure 3 For Figure 2 It is a schematic structural diagram of a partial enlarged view at A in.

[0015] In the figure: 1. Roll crusher body, 2. Pneumatic sealing device, 3. Oil seal device;

[0016] 11. Roller part, 12. Housing part, 13. Support device, 14. Sealing device, 15. Transmission device,

[0017] 16. Enclosed working space, 111. Tooth roller shaft, 112. Limiting part, 121. Sealing space, 122. Sealing housing, 131. Bearing, 132. Bearing seat;

[0018] 21. Auxiliary seal, 22. Pneumatic seal, 23. Air duct, 31. Sealing ring, 32. Oil injection hole duct, 211. Groove, 221. Ventilation cavity. Specific embodiments

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "inner", "outer", "upper", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention 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 therefore cannot be understood as a limitation to the present invention.

[0021] As Figure 2 shown, the embodiment of the present invention includes a roller part 11. A tooth roller shaft 111 is provided at the axis of the roller part 11. The tooth roller shaft 111 is divided into left and right two sections with different diameters. A limiting part 112 with a U-shaped cross-section is fixedly connected to the right end of its left section, and is bolted to a sealing housing 122. The sealing housing 122 and the tooth roller shaft 111 form a sealing space 121. An airtight sealing device 2 is arranged in the sealing space 121 around the tooth roller shaft 111. An oil seal device 3 is fixedly connected to the right side of the airtight sealing device 2.

[0022] As Figure 3As shown in the figure, the pneumatic sealing device 2 in the embodiment of the present utility model includes a pneumatic seal 22 welded to the sealing housing 122 and an auxiliary seal 21 welded to the right side of the limiting member 112. The pneumatic seal 22 and the auxiliary seal 21 are both connected together by bolts in a piecewise manner. In this embodiment, a two-piece type is preferably used, which is convenient for the transformation of the existing center roller crusher. It only needs to place the two sections of the pneumatic seal 22 and the auxiliary seal 21 on the outer peripheral side of the tooth roller shaft 111 and connect them with bolts, and then directly weld them to determine their specific positions.

[0023] Specifically, the pneumatic seal 22 is formed with a ventilation cavity 221. The left section of the ventilation cavity 221 is a hollow cylinder with an inner diameter about 6 mm larger than the diameter of the left section of the tooth roller shaft 111, and its axis coincides with the axis of the tooth roller shaft 111; the right section of the ventilation cavity 221 is a hollow housing welded to the right side of the sealing housing 122, which is not in the sealing space 121, and it is formed with an injection port for injecting compressed air, so that the compressed air can enter the sealing space 121 along the internal channel of the ventilation cavity 221.

[0024] Specifically, the auxiliary seal 21 is divided into two sections. Its left section is a hollow cylinder with an inner diameter about 6 mm larger than the outer diameter of the tooth roller shaft 111, that is, the gap between the inner peripheral side of the auxiliary seal 21 and the outer peripheral side of the tooth roller shaft 111 is kept at 3 mm. After the pneumatic seal 22 is fixed in position, the auxiliary seal 21 can adjust its own position and the screw-in length of the bolt so that its axis coincides with the pneumatic seal 22. In this way, when the auxiliary seal 21 rotates with the tooth roller shaft 111, it will not collide with the pneumatic seal 22. The right section of the auxiliary seal 21 is formed with a groove 211 about 4 mm larger than the outer diameter of the left section of the pneumatic seal 22, and the projection of the groove 211 on the left section of the ventilation cavity 221 can cover a part of it. The groove 211, the left section of the pneumatic seal 22 and the ventilation cavity 221 together form a tortuous air duct 23.

[0025] Compressed air can enter the ventilation cavity 221 from the injection port, and then enter the sealing space 121 through the air duct 23. When the high-temperature dust moves at high speed under the positive pressure drive in the sealing space 121, the compressed air can evenly counteract the impact force of the high-temperature dust along the air duct 23, forming a good pneumatic seal, avoiding the high-temperature dust from scouring the tooth roller shaft 111 and contacting the sealing device 14 to cause its aging and wear.

[0026] In addition, an oil seal device 3 is fixed on the right side of the pneumatic sealing device 2. The oil seal device 3 includes a sealing ring 31 arranged on the outer peripheral side of the tooth roller shaft 111, and the oil seal device 3 is formed with an oil injection channel 32 along the radial direction of the sealing ring 31, so that the lubricating oil can timely infiltrate the sealing ring 31 to play a role in cooling and lubrication.

[0027] The pneumatic sealing device 2 can counteract the impact force of high-temperature dust, and the oil seal device 3 can resist the high-temperature corrosion of high-temperature dust. The combined action of the two can improve the sealing performance of the center roll crusher.

[0028] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sealing device for a central roller crusher, characterized in that, including a roll crusher body (1), the roll crusher body (1) comprising a roll part (11) and a housing part (12), a sealing space (121) being formed on the circumferential side of one end of the housing part (12), and a toothed roll shaft (111) being arranged at the axis of the roll part (11); a pneumatic sealing device (2) arranged at one end of the toothed roll shaft (111) close to the sealing space (121), the pneumatic sealing device (2) comprising a pneumatic seal (22), the pneumatic seal (22) being formed with a ventilation cavity (221), and the ventilation cavity (221) penetrating through the sealing space (121).

2. The sealing device according to claim 1, wherein: The pneumatic sealing device (2) further comprises an auxiliary seal (21), a groove (211) being formed on the side of the auxiliary seal (21) close to the pneumatic seal (22), and the groove (211) being able to cover a part of the ventilation cavity (221) when projected along the radial direction of the toothed roll shaft (111).

3. The sealing device according to claim 2, characterized in that: The pneumatic seal (22) is arranged at one end of the toothed roll shaft (111) and forms a zigzag air duct (23) with the groove (211), one end of the air duct (23) being in communication with the ventilation cavity (221), and the other end of the air duct (23) being in communication with the sealing space (121).

4. The sealing device according to claim 1, characterized in that: It further comprises an oil seal device (3) arranged on the circumferential side of one end of the toothed roll shaft (111) close to the pneumatic sealing device (2), the oil seal device (3) also being arranged on the side of the pneumatic sealing device (2) away from the toothed roll shaft (111), and the oil seal device (3) comprising a sealing ring (31) arranged on the circumferential side of the toothed roll shaft (111).

5. The sealing device according to claim 4, characterized in that: The oil seal device (3) forms an oil injection channel (32) along the radial direction of the sealing ring (31), and the oil injection channel (32) communicates the outside with the sealing ring (31).

6. The sealing device according to claim 2, wherein: The clearance between the inner circumferential surface of the auxiliary seal (21) and the outer circumferential surface of the toothed roll shaft (111) is maintained at 3 mm.

7. The sealing device according to claim 3, characterized in that: Both the auxiliary seal (21) and the pneumatic seal (22) adopt a segmented structure.

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