Sealing device with elastic compensation

Abstract

The utility model relates to the technical field of sealing of positive pressure type steel ball coal mills, and discloses a sealing device with elastic compensation, which comprises a box body, an auger shaft arranged in the box body, a fixed disc arranged on the outer side of the box body and positioned on the outer side of the auger shaft, a first mounting groove formed in the fixed disc, a packing arranged in the first mounting groove, a pressure plate arranged on the outer side of the auger shaft, and an elastic compensation device arranged on the outer side of the pressure plate, a second mounting groove is formed in the pressing disc, a plurality of mounting holes are formed in the second mounting groove, a spring is arranged in each mounting hole, a pressing ring is arranged in the second mounting groove, and the pressing ring is fixedly connected with the other end of each spring; and under the pushing of the spring, the tight contact between the pressing ring and the packing is realized, so that not only is the abrasion to the packing reduced, but also the air tightness of a dynamic sealing surface is further improved.

Description

Technical Field

[0001] The utility model relates to the field of positive pressure steel ball coal mill seals, in particular to a sealing device with elastic compensation. Background Art

[0002] The ball mill is a machine that breaks up coal blocks and grinds them into coal powder. It is an important auxiliary equipment for pulverized coal furnaces. Its main working methods are through crushing, smashing and grinding. Each mill is equipped with auger conveying devices at both ends. The function of the auger is to transport the coal from the coal drop pipe and the powder from the separator to the mill. One end of the auger is fixed inside the mill, and the other end passes through the hot air box shell of the mill. It is fixed by the support bearing outside the mill. The auger rotates with the mill. Since the auger of the ball mill is relatively long and has a certain deflection, radial deflection will occur during use, squeezing the shaft seal packing and increasing the wear of the packing. Because the inside of the mill is positive pressure hot air, when the auger passes through the hot air box shell, it needs to be sealed to prevent the hot air from leaking out.

[0003] The existing technology of auger sealing structure of ball mill has the following problems: the place where the auger shaft head passes through the hot air box is a compression packing sealing structure, the main function of which is to seal the positive pressure hot air in the mill. However, with long-term use, the hot air in the mill will carry coal powder into the sealing surface, thereby accelerating the wear of the packing, greatly reducing the service life of the packing, and further resulting in a reduction in the sealing effect of the packing. For this reason, we propose a sealing device with elastic compensation to solve the above problems. Utility Model Content

[0004] The utility model aims to provide a sealing device with elastic compensation to solve the problem that hot air carries coal powder into the sealing surface, thereby accelerating the wear of the packing and further reducing the sealing effect of the packing.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a sealing device with elastic compensation, including a box body, a screw shaft is arranged in the box body, a fixed disk is arranged on the outside of the box body, and the fixed disk is located on the outside of the screw shaft, a first mounting groove is opened in the fixed disk, a packing is arranged in the first mounting groove, a pressure plate is arranged on the outside of the screw shaft, a second mounting groove is opened in the pressure plate, a plurality of mounting holes are opened in the second mounting groove, a spring is arranged in each mounting hole, a pressure ring is arranged in the second mounting groove, and the pressure ring is fixedly connected to the other end of each spring.

[0006] The benefits of this program are:

[0007] 1. During the installation process, by adjusting the position of the pressure plate, the spring pushes the pressure ring to squeeze the packing, thereby applying a certain pre-pressure to the packing. Under the action of the pre-pressure, the packing is compressed in the first installation groove and forms a more closely contacted static sealing surface with the pressure ring. During operation, the spring will dynamically compensate the pressure ring, thereby reducing the loss of the packing and further improving the sealing effect.

[0008] 2. In the prior art, since the ball mill auger is overall longer and has a certain deflection, radial deflection will occur during use, squeezing the shaft seal packing and increasing the wear of the packing. In the present solution, the packing is compressed in the first mounting groove. At the same time, during operation, the spring will continuously provide pressure to the pressure ring, so that the packing squeezes the inner wall of the first mounting groove, thereby providing a certain pressure on the axis of the fixed disk, thereby having the ability to offset the radial deflection caused by the rotation of the auger shaft, thereby reducing the wear on the packing.

[0009] Preferably, as an improvement, a limiting sleeve is provided on the outer side of the auger shaft, a threaded hole is provided on the outer wall of the limiting sleeve, and a locking bolt is threadedly connected to the inner thread of the threaded hole.

[0010] The beneficial effect is that the limiting sleeve and the locking bolt cooperate with each other to adjust the position of the pressure plate, thereby adjusting the compression amount of the internal spring by adjusting the position of the pressure plate to ensure that a certain pre-pressure is always maintained between the pressure ring and the packing.

[0011] Preferably, as an improvement, the fixing plate is fixed to the box body by welding.

[0012] The beneficial effects are: increasing the stability of the fixed plate and preventing the fixed plate from shaking when the auger shaft deflects radially, thereby affecting the normal operation of the packing.

[0013] Preferably, as an improvement, the mounting holes are arranged in the second mounting groove at equal intervals, and the number of the mounting holes is set to 8.

[0014] The beneficial effect is that a spring is installed in each of the eight mounting holes, and the eight springs arranged at equal intervals can provide uniform pressure to the pressure ring, thereby improving the sealing performance between the pressure plate and the pressure ring.

[0015] Preferably, as an improvement, the packing is configured as a graphite packing.

[0016] The beneficial effects are: the graphite packing has an extremely low friction coefficient and good thermal conductivity, which enables it to quickly transfer heat during operation and reduces its own loss.

[0017] Preferably, as an improvement, high temperature resistant grease is filled between the pressure plate and the pressure ring.

[0018] The beneficial effects are: the high temperature resistant lubricating oil can further reduce the friction between the packing and the pressure ring, reduce the loss of the packing, and at the same time the high temperature resistant lubricating oil can fill the gap between the pressure plate and the pressure ring, thereby further improving the airtightness between the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the embodiment;

[0020] Figure 2 It is a schematic diagram of the pressure plate structure of an embodiment. DETAILED DESCRIPTION

[0021] The following is further described in detail through specific implementation methods:

[0022] The reference numerals in the drawings of the specification include: box body 1, auger shaft 2, fixing plate 3, first mounting groove 4, packing 5, pressure plate 6, second mounting groove 7, spring 8, pressure ring 9, limiting sleeve 10, locking bolt 11.

[0023] Example

[0024] The embodiment is basically as shown in the attached Figure 1-2 As shown, Figure 1 A sealing device with elastic compensation is shown, comprising a box body 1, in which an auger shaft 2 is installed for transverse rotation, a fixed plate 3 is fixed to the box body 1 by welding, and the fixed plate 3 is sleeved on the outside of the auger shaft 2, a first mounting groove 4 is opened in the fixed plate 3, the first mounting groove 4 is in a circular ring shape, and a packing 5 is inlaid in the first mounting groove 4, a pressure plate 6 is interference fitted on the outside of the auger shaft 2, a second mounting groove 7 is opened in the pressure plate 6, the second mounting groove 7 is in a circular ring shape, and the width is equal to that of the first mounting groove 4, a plurality of mounting holes are opened in the second mounting groove 7, the mounting holes are equidistantly opened in the second mounting groove 7 in a circular ring shape, a spring 8 is fixedly connected in each mounting hole, a pressure ring 9 is slidably installed in the second mounting groove 7, and the pressure ring 9 is fixedly connected to the other end of each spring 8.

[0025] The outer sliding sleeve of the auger shaft 2 has a limited position sleeve 10, such as Figure 1 As shown, the positional relationship between the limiting sleeve 10, the pressure plate 6 and the fixed plate 3 is that they are installed in sequence from left to right. A threaded hole is opened on the outer wall of the limiting sleeve 10, and a locking bolt 11 is threadedly connected to the inner thread of the threaded hole. The locking bolt 11 can be abutted against the outer wall of the auger shaft 2 through the threaded hole.

[0026] The pressure plate 6 and the pressure ring 9 are filled with high temperature resistant grease, and the high temperature resistant lubricating oil can fill the gap between the pressure plate 6 and the pressure ring 9, thereby further improving the airtightness between the two.

[0027] like Figure 2As shown, the mounting holes are arranged in a circular shape at equal intervals in the second mounting groove 7, and the number of the mounting holes is set to .

[0028] The specific implementation process is as follows:

[0029] During installation, first adjust the position of the pressure plate 6 so that each spring 8 has a certain amount of compression, thereby ensuring that a certain pre-pressure is always maintained between the packing 5 and the pressure ring 9. At this time, the locking bolt 11 is rotated to make it abut against the outer wall of the auger shaft 2, thereby locking the limit sleeve 10, and then fixing the pressure plate 6 to prevent the pressure plate 6 from being displaced when the auger shaft 2 rotates;

[0030] When working, the auger shaft 2 starts to rotate, thereby driving the limiting sleeve 10 and the pressure plate 6 on the outside of the auger shaft 2 to rotate. At this time, the pressure plate 6 with interference fit on the outer wall of the auger shaft 2 will rotate relative to the fixed plate 3, and then the pressure ring 9 and the packing 5 will also slide relatively. Under the push of the spring 8, the pressure ring 9 is in close contact with the packing 5, and at the same time, the contact surface of the two is filled with high-temperature resistant grease, which further increases the air tightness of the sealing surface. At the same time, the spring 8 will continuously provide pressure to the pressure ring 9, so that the packing 5 squeezes the inner wall of the first mounting groove 4, thereby providing a certain pressure on the axis of the fixed plate 3, thereby having the ability to offset the radial deflection caused by the rotation of the auger shaft 2, reducing the wear on the packing 5. The hot air inside the box body 1 first flows into the gap between the fixed plate 3 and the auger shaft 2, and then flows into the gap between the packing 5 and the pressure ring 9, and is finally blocked by the dynamic sealing surface formed between the packing 5 and the pressure ring 9, thereby achieving sealing of the hot air.

[0031] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A sealing device with elastic compensation, comprising a box body, in which a screw shaft is arranged, characterized in that: A fixed plate is provided on the outside of the box body, and the fixed plate is located on the outside of the auger shaft. A first mounting groove is opened in the fixed plate, and a packing is arranged in the first mounting groove. A pressure plate is provided on the outside of the auger shaft, and a second mounting groove is opened in the pressure plate. A plurality of mounting holes are opened in the second mounting groove, and a spring is arranged in each mounting hole. A pressure ring is provided in the second mounting groove, and the pressure ring is fixedly connected to the other end of each spring.

2. A sealing device with elastic compensation according to claim 1, characterized in that: A limiting shaft sleeve is arranged on the outer side of the auger shaft, a threaded hole is opened on the outer wall of the limiting shaft sleeve, and a locking bolt is connected with threads in the threaded hole.

3. A sealing device with elastic compensation according to claim 1, characterized in that: The fixing plate is fixed on the box body by welding.

4. A sealing device with elastic compensation according to claim 1, characterized in that: The mounting holes are arranged in the second mounting groove at equal intervals, and the number of the mounting holes is set to 8.

5. A sealing device with elastic compensation according to claim 1, characterized in that: The packing is set as graphite packing.

6. A sealing device with elastic compensation according to claim 1, characterized in that: The space between the pressure plate and the pressure ring is filled with high temperature resistant grease.

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