Sealing assembly and coal mill base sealing device

Abstract

The utility model discloses a sealing assembly and a coal mill base sealing device, and belongs to the technical field of coal mill base sealing. The sealing assembly comprises an outer sealing piece, wherein a containing groove used for containing an inner sealing piece is formed in the inner side wall of the outer sealing piece; the containing groove divides the inner wall of the outer sealing piece into an upper part and a lower part, and each part is provided with at least one sealing part. A spine part is formed on the inner wall of the inner sealing piece and is used for forming linear contact with a main shaft; a pre-tightening piece is arranged on the peripheral wall of the inner sealing piece in a sleeving mode. According to the utility model, the spine part is arranged, so that the inner sealing piece is in linear contact with the main shaft; and in cooperation with the use of the pre-tightening piece, the pre-tightening force of the pre-tightening piece on the line contact position between the spine part and the main shaft is more concentrated, the contact pressure of the line contact position is increased, and therefore the sealing performance is improved, and coal powder leakage is prevented.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of coal mill base seal, more specifically, relates to a sealing assembly and coal mill base sealing device. BACKGROUND

[0002] When the coal mill is working, in order to make the coal powder smoothly sent out of the coal mill along with the airflow, the hot air will form a large wind pressure in the coal mill, which on the one hand plays a drying role on the sent-out coal powder, and on the other hand sends the coal powder out of the coal mill from the coal powder outlet at the upper part of the coal mill, which will cause the coal powder to appear the phenomenon of finding a gap to drill under the action of internal wind pressure. And the main shaft is in a rotating state when working, so there will be a gap between the main shaft and the coal mill shell. Therefore, the coal powder will drill out from the gap between the main shaft and the coal mill shell under the action of wind pressure, causing a large amount of coal powder leakage and environmental pollution.

[0003] Therefore, the existing coal mill generally sets a sealing air chamber around the main shaft below the grinding disc, and installs a sealing element between the sealing air chamber and the main shaft. When the coal mill is working, the sealing air chamber is blown with sealing air to compensate the wind pressure of the hot air in the coal mill, preventing the coal powder from leaking under the action of hot air.

[0004] After searching, there are related patents disclosed about the sealing device at the main shaft of the coal mill base, and the applicant has been committed to the research and development design and structure optimization of the base seal. For example, in the patent CN112797163A, a coal mill is disclosed. The coal mill of the application includes a main shaft, a grinding disc and a shell, and has a grinding disc sealing structure between the grinding disc and the shell and a sealing base and a sealing ring between the main shaft and the shell. The sealing base is installed at the bottom of the shell and has a central hole through which the rotating shaft passes, and an annular sealing cavity opening towards the central hole is formed in the sealing base. The sealing ring is annular in structure and has an installation hole, which is sleeved on the main shaft through the installation hole. The annular main body of the sealing ring extends outwardly on the circumference of the outer side wall and extends outwardly on the circumference of the outer side wall. The main lip extends into the sealing cavity and contacts the inner wall of the sealing cavity for sealing, and the auxiliary lip extends into the sealing cavity and contacts the inner wall of the sealing cavity for sealing or is located outside the sealing cavity and contacts the outer wall of the sealing cavity for sealing.

[0005] For another example, in the patent CN219388613U, a double-layer sealing assembly and a coal mill base sealing structure are disclosed. The first compensation groove is formed on the inner side wall of the second sealing element, which divides the inner side wall of the second sealing element into two parts. When the main shaft and the second sealing element appear relative displacement, the second sealing element can swing to a certain extent in the sealing cavity of the first sealing element to adapt to the radial swing of the main shaft. At the same time, the first compensation groove can compensate the displacement of the two parts of the inner side wall to a certain extent to reduce the wear of the inner side wall of the second sealing element and ensure the sealing effect.

[0006] However, in actual use, it is found that the lip corresponding to the fastener and the main shaft are in surface contact, so that the locking force of the fastener at the contact surface is relatively dispersed, and the pre-tightening force cannot be provided to the entire contact surface. Especially during the oscillation of the main shaft, a gap is easily formed between the lip and the main shaft, thereby causing sealing failure. Content of the Utility Model

[0007] 1. Problem to be solved

[0008] In view of the problem that the sealing lip and the main shaft are in surface contact, and the locking force is not easy to concentrate when locking with the fastener, thereby affecting the sealing effect, the utility model provides a sealing assembly and a coal mill base sealing device, which can effectively increase the contact pressure between the sealing member and the main shaft and ensure the sealing performance through the linear contact between the sealing member and the main shaft.

[0009] 2. Technical scheme

[0010] In order to solve the above problem, the technical scheme adopted by the utility model is as follows:

[0011] The utility model discloses a sealing assembly, which comprises an outer sealing member, a containing groove for containing an inner sealing member is formed on the inner side wall of the outer sealing member, the containing groove divides the inner wall of the outer sealing member into two parts, and at least one sealing part exists on each part.

[0012] A sharp part is formed on the inner wall of the inner sealing member, and the sharp part is used for forming linear contact with the main shaft.

[0013] A pre-tightening member is sleeved on the outer peripheral wall of the inner sealing member, and the pre-tightening member is used for increasing the linear contact pressure between the sharp part and the main shaft.

[0014] In some embodiments, the sharp part is provided with two sharp parts, a third compensation groove is formed between the two sharp parts, a second mounting groove for mounting the pre-tightening member is arranged on the outer peripheral wall of the inner sealing member, and the two sharp parts are located on the upper and lower sides of the center line of the second mounting groove respectively.

[0015] In some embodiments, the two sharp parts are symmetrically distributed on the two sides of the center line of the third compensation groove, and the center line of the second mounting groove and the center line of the third compensation groove coincide with each other.

[0016] In some embodiments, the outer peripheral wall of the inner sealing member is divided into two outer lips distributed in an upper and lower manner after being divided by the second mounting groove, and in a state that the two outer lips are naturally unfolded, the size in the axial direction of the inner sealing member is greater than the axial size of the containing groove, and the size in the radial direction of the inner sealing member is less than the radial size of the containing groove.

[0017] In some embodiments, the pre-tightening member is a spring or a clamp; and the accommodating groove is connected to a sealed air.

[0018] In some embodiments, the outer sealing member comprises a body and a ring table arranged below the body; wherein the inner wall of the body is divided by the accommodating groove to form a first sealing part and a second sealing part, and the ring table is formed with a third sealing part.

[0019] The second sealing part and the third sealing part are formed with a first compensation groove, and a second compensation groove extending to the outer wall of the outer sealing member is arranged in the first compensation groove; and the outer peripheral wall of the ring table is sleeved with a pre-tightening member.

[0020] In some embodiments, the second sealing part forms a surface contact with the main shaft, and the third sealing part forms a line contact with the main shaft; a first installation groove for clamping the pre-tightening member is arranged on the outer peripheral wall of the third sealing part, and the tip part of the third sealing part is located in the axial area occupied by the first installation groove.

[0021] In some embodiments, the first sealing part forms a surface contact with the main shaft, and the top of the first sealing part is formed with an inclined surface.

[0022] The utility model also provides a coal mill base sealing device for sleeving on the main shaft, which comprises a sealing base and a sealing assembly arranged in the sealing base, and the sealing assembly is the above-mentioned sealing assembly, wherein the third sealing part extends out of the sealing base.

[0023] In some embodiments, the sealing base comprises an upper pressing plate, a lower pressing plate and locking bolts for connecting the upper and lower pressing plates; wherein the upper pressing plate is arranged on the top of the body, and the lower pressing plate is arranged in the clamping groove formed between the body and the outer peripheral wall of the convex ring.

[0024] 3, beneficial effects

[0025] Compared with the prior art, the utility model has the beneficial effects that:

[0026] (1) the utility model discloses a sealing assembly, which comprises inner and outer inner sealing members and outer sealing members, the inner wall of the outer sealing member is divided into two parts by the accommodating groove, and at least one sealing part exists on each part, and the sealing performance of the inner sealing member is added; in this way, multiple sealing places can be formed in the axial direction of the main shaft, which is beneficial to guarantee the sealing effect of the main shaft. Meanwhile, the inner wall of the inner sealing member is formed with a thorn part, and the thorn part forms a line contact with the main shaft; in combination with the use of the pre-tightening member, the pre-tightening force of the pre-tightening member on the line contact between the thorn part and the main shaft is more concentrated, which is beneficial to increase the contact pressure of the line contact, thereby improving the sealing performance and preventing coal dust leakage.

[0027] (2) The utility model discloses a sealing assembly, and two sharp parts are formed on the inner wall of the inner sealing piece, and the two sharp parts are located on the two sides of the center line of the second installation groove respectively. In this way, on the one hand, the stability of the contact between the inner sealing piece and the main shaft can be ensured; on the other hand, the contact pressure between the two sharp parts and the main shaft can be ensured simultaneously.

[0028] (3) The utility model discloses a sealing assembly, and the size of the inner sealing piece in the axial direction is less than the axial size of the containing groove when the two outer lips are naturally unfolded, so that the two outer lips can be extruded to form a good seal when being in contact with the groove wall of the containing groove. At the same time, the size of the containing groove in the radial direction is greater than the radial size of the inner sealing piece, so that the inner sealing piece can move radially in the containing groove when being extruded radially by the main shaft to adapt to the swing of the main shaft.

[0029] (4) The utility model discloses a sealing assembly, and a slope is formed on the top of the first sealing part to guide the coal powder, avoid the accumulation of the coal powder between the first sealing part and the main shaft, and reduce the risk of the coal powder entering the sealing surface between the two. At the same time, the slope can also clean the coal powder adhered to the main shaft.

[0030] (5) The utility model discloses a sealing assembly, and the first compensation groove and the second compensation groove are formed between the second sealing part and the third sealing part. Through the setting of the two compensation grooves, the third sealing part can be deformed more easily when being extruded radially by the pre-tightening piece, so as to better fit the surface of the main shaft and ensure the sealing performance. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a structure schematic view of the sealing assembly of the utility model;

[0032] Figure 2 It is an internal structure schematic view of the sealing assembly of the utility model;

[0033] Figure 3 It is a structure schematic view of the outer sealing piece in the utility model;

[0034] Figure 4 It is Figure 3 It is a local enlarged schematic view of A in the utility model;

[0035] Figure 5 It is a structure schematic view of the inner sealing piece in the utility model;

[0036] Figure 6 It is Figure 5 It is a local enlarged schematic view of B in the utility model;

[0037] Figure 7The utility model discloses a structure diagram of a coal mill base sealing device.

[0038] In the drawing: 100, outer sealing piece;110, containing groove;120, first sealing part;130, second sealing part;140, third sealing part;150, first compensation groove;160, second compensation groove;170, first installation groove;180, inclined plane;190, clamping groove;

[0039] 200, inner sealing piece;210, sharp part;220, third compensation groove;230, second installation groove;240, outer lip;

[0040] 300, pre-tightening piece;400, sealing base;410, upper pressing plate;420, lower pressing plate;430, locking bolt;500, main shaft. DETAILED DESCRIPTION

[0041] In order to further understand the content of the utility model, the utility model is described in detail in combination with the drawings.

[0042] In the description of the utility model, it is explained that the orientation or position relation of the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relation shown in the drawing, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it can not be understood as the limitation of the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and can not be understood as indicating or implying relative importance.

[0043] As said in the background art, in the traditional base sealing device, the contact area between the sealing piece and the main shaft is generally increased to improve the sealing performance, that is, the contact between the sealing piece and the main shaft is surface contact. But through the actual operation of the inventor, it is found that when the contact between the sealing piece and the main shaft is surface contact and cooperates with the locking piece, the pre-tightening force of the locking piece at the contact surface is relatively dispersed, and can not provide good pre-tightening force for the whole contact surface. Especially in the process of main shaft swing, although the elasticity of the sealing piece can adapt to the swing of the main shaft and hold the main shaft, but since the locking force of the locking piece is not fully utilized, after long time work, gap is easy to form between the sealing piece and the main shaft, thereby leading to sealing failure.

[0044] The most effective way that can be thought of for the above problems is to increase the locking force of the locking member. Although the greater locking force can increase the holding force between the sealing member and the main shaft, the over-tight holding force also increases the resistance of the main shaft when moving in the axial direction. In severe cases, not only the normal movement of the main shaft is affected, but also the friction loss between the sealing member and the main shaft is increased, which is not conducive to the maintenance of the sealing performance. Therefore, the utility model aims to provide a sealing assembly which, when used in cooperation with the pre-tightening member, can maximize the use of the locking force provided by the pre-tightening member, so that the sealing member can be more tightly attached to the main shaft, and the axial movement of the main shaft is not easily interfered, so as to reduce the risk of leakage.

[0045] The utility model will be further described below in combination with specific embodiments.

[0046] As shown in Figure 1 , Figure 2 and Figure 7 , the sealing assembly of the embodiment is wholly sleeved on the main shaft 500, is used for sealing the main shaft 500, and can adapt to the axial movement and radial swing of the main shaft 500. The sealing assembly comprises an inner sealing member 200 and an outer sealing member 100 which are sleeved inside and outside. The inner sealing member 200 and the main shaft 500 can form linear contact. Meanwhile, the outer peripheral wall of the inner sealing member 200 is sleeved with a pre-tightening member 300, which is used for increasing the linear contact pressure between the sharp part 210 and the main shaft 500.

[0047] The sealing assembly of the embodiment realizes linear contact sealing between the inner sealing member 200 and the main shaft 500, so that the contact area between them is small. At this time, the pre-tightening force of the pre-tightening member 300 can be more concentrated on the linear contact, so that the contact pressure of the linear contact between the inner sealing member 200 and the main shaft 500 can be effectively improved. Under the same swing frequency, the gap at the linear contact is obviously improved, which is obviously beneficial to the sealing effect. Meanwhile, since the contact area between the inner sealing member 200 and the main shaft 500 is smaller, compared with the traditional surface contact, the resistance to the axial movement of the main shaft 500 will be smaller under the same pressure.

[0048] It should be noted that the linear contact described above does not refer to the geometric linear contact, but allows a certain width (the dimension along the axial direction of the main shaft), only the width is greatly reduced compared with the traditional surface contact, so it can be approximately regarded as linear contact.

[0049] Specifically, reference is made to Figure 3 , Figure 5 and Figure 6As shown, a receiving groove 110 is formed on the inner wall of the outer seal 100, which divides the inner wall of the outer seal 100 into two parts. In this way, a first sealing part 120 is formed on the upper part of the inner wall, and a second sealing part 130 is formed on the lower part of the inner wall.

[0050] The inner seal 200 is located in the receiving groove 110, and a sharp part 210 is formed on the inner circumferential wall of the inner seal 200, which is used to form a line contact with the main shaft 500. A second mounting groove 230 is formed on the outer circumferential wall of the inner seal 200 for mounting the pre-tightening member 300. The pre-tightening member 300 can be a spring, a clamp or other existing component that can provide pre-tightening force to the inner seal 200, which is not specifically limited here. At the same time, the outer circumferential wall of the inner seal 200 is divided by the second mounting groove 230 to form two outer lips 240 distributed in an upper and lower manner. The free ends of the two outer lips 240 are arranged away from each other and are in sealing contact with the upper and lower groove walls of the receiving groove 110.

[0051] In this embodiment, through the arrangement of the first sealing part 120, the second sealing part 130 and the sharp part 210, multiple sealing positions can be formed in the axial direction of the main shaft 500, which is beneficial to ensure the sealing effect of the main shaft 500. More importantly, through the line contact between the sharp part 210 and the main shaft 500, when used in cooperation with the pre-tightening member 300, the holding force of the sharp part 210 on the main shaft 500 can be effectively increased. Of course, in order to further improve the sealing effect, sealing air can be introduced into the receiving groove 110, and the sealing air can form a certain pressure difference between the inside and outside of the receiving groove 110, which can also prevent the leakage of coal powder.

[0052] In some embodiments, the axial dimension of the inner seal 200 in the state where the two outer lips 240 naturally expand is greater than the axial dimension of the receiving groove 110; so that when the two outer lips 240 are in contact with the groove walls of the receiving groove 110, they can be subjected to a certain extrusion to form a good seal. At the same time, the radial dimension of the inner seal 200 is smaller than the radial dimension of the receiving groove 110, so that the inner seal 200 can have a certain radial movement space in the receiving groove 110 when subjected to radial extrusion of the main shaft 500, to adapt to the swing of the main shaft 500.

[0053] As Figure 3 , Figure 4As shown, in some other embodiments, the outer seal 100 comprises a body and a ring table below the body. The accommodating groove 110 is formed on the body. The first sealing part 120 and the second sealing part 130 formed on the body are in surface contact with the main shaft 500 to increase the contact area. The third sealing part 140 is formed on the ring table and is in line contact with the main shaft 500. Meanwhile, the first mounting groove 170 for mounting the pre-tightening member 300 is formed on the outer wall of the third sealing part 140.

[0054] Preferably, a slope 180 is formed on the top of the first sealing part 120. The slope 180 is used to guide the falling coal powder and avoid the coal powder from accumulating at the contact between the first sealing part 120 and the main shaft 500, thereby reducing the risk of the coal powder entering the sealing surface between the first sealing part 120 and the main shaft 500. In addition, the slope 180 can be used to clean the coal powder adhered to the main shaft 500 when the main shaft 500 moves axially, so as to prevent the adhered coal powder from entering the sealing surface of the first sealing part 120 with the movement of the main shaft 500, thereby accelerating the wear of the first sealing part 120.

[0055] Meanwhile, the tip part (the part for forming line contact with the main shaft) of the third sealing part 140 is located in the axial area occupied by the first mounting groove 170, so that the locking force of the pre-tightening member 300 can be more concentrated on the tip part of the third sealing part 140, thereby further increasing the line contact pressure between the third sealing part 140 and the main shaft 500.

[0056] Further, the first compensation groove 150 is formed between the second sealing part 130 and the third sealing part 140, and the second compensation groove 160 extending to the outer wall of the outer seal 100 is formed on the inner wall of the first compensation groove 150. By providing two compensation grooves between the second sealing part 130 and the third sealing part 140, the third sealing part 140 can be deformed more easily when subjected to the radial locking force provided by the pre-tightening member 300, so as to better fit the surface of the main shaft 500 and ensure the sealing performance.

[0057] It is worth mentioning that, in the above embodiments, the outer seal 100 is divided into two parts, the body and the ring table, which is only for the convenience of introducing the structure of the outer seal 100. It does not mean that the outer seal 100 must be connected by two parts. In fact, the outer seal 100 can be integrally formed.

[0058] In the embodiment, only one contact is formed between the inner seal 200 and the main shaft 500 through the spike 210, and the contact is a line contact. In actual assembly, it is found that the inner seal 200 is inevitably tilted to one side when it is sleeved on the main shaft 500. This will result in that the locking force of the pre-tightening member 300 cannot be well concentrated on the line contact, thereby greatly weakening the locking force of the pre-tightening member 300 on the line contact. At the same time, due to the tilt of the inner seal 200, the extrusion force between the two outer lips 240 and the groove wall of the accommodating groove 110 is unbalanced, which is also not conducive to the improvement of the sealing performance.

[0059] To solve the above problems, referring to FIG. 1, in the embodiment, two spikes 210 are formed on the inner wall of the inner seal 200, a third compensation groove 220 is formed between the two spikes 210, and the two spikes 210 are respectively located on the upper and lower sides of the center line of the second mounting groove 230. This design forms two line contacts between the inner seal 200 and the main shaft 500, which is conducive to ensuring the stability of the assembly therebetween. At the same time, through the design of the positions between the two spikes 210 and the second mounting groove 230, the locking force of the pre-tightening member 300 can be more evenly distributed to the two spikes 210, thereby ensuring the contact pressure between each spike 210 and the main shaft 500. Of course, more spikes 210 can be provided, such as 3, 4, etc. However, only when the spikes 210 are provided as two, the contact pressure of each spike 210 can be more balanced. Figure 6 In some embodiments, to further ensure the contact pressure between each spike 210 and the main shaft 500, the two spikes 210 are symmetrically distributed on both sides of the center line (the dashed line portion in FIG. 2) of the third compensation groove 220, and the center line of the second mounting groove 230 and the center line of the third compensation groove 220 coincide with each other.

[0060] Figure 6 In the embodiment, the two spikes 210 are symmetrically distributed on both sides of the center line of the third compensation groove 220, and the center line of the second mounting groove 230 and the center line of the third compensation groove 220 coincide with each other.

[0061] The embodiment also provides a sealing device for a mill stand, which comprises a sealing base 400 and the sealing assembly described above. Specifically, as shown in FIG. 3 and FIG. 4, the sealing base 400 comprises an upper pressing plate 410, a lower pressing plate 420, and a locking bolt 430 for connecting the upper and lower pressing plates. The upper pressing plate 410 is arranged on the top of the body of the outer seal 100. At the same time, a clamping groove 190 is formed between the body and the outer peripheral wall of the convex ring. The end of the lower pressing plate 420 can be clamped into the clamping groove 190, so that the third sealing part 140 can extend out of the sealing base 400. Of course, in order to enable the sealing assembly to adapt to the radial swing of the main shaft 500, a certain space is left between the inner wall of the upper pressing plate 410 and the first sealing part 120, and between the inner wall of the clamping groove 190 and the lower pressing plate 420. Figure 3 Figure 7 Of course, in order to enable the sealing assembly to adapt to the radial swing of the main shaft 500, a certain space is left between the inner wall of the upper pressing plate 410 and the first sealing part 120, and between the inner wall of the clamping groove 190 and the lower pressing plate 420. ​​

[0062] The above describes the utility model and its embodiments in a schematic way, which is not restrictive, and the drawings only show one of the embodiments of the utility model, and the actual structure is not limited thereto. Therefore, if a person of ordinary skill in the art is inspired thereby, without departing from the creative purpose of the utility model, similar structural modes and embodiments are not created by creativity, which should all belong to the protection scope of the utility model.

Claims

1. A sealing assembly comprising an outer sealing member (100), an accommodating groove (110) being formed on an inner side wall of the outer sealing member (100) for accommodating an inner sealing member (200); the accommodating groove (110) divides the inner wall of the outer sealing member (100) into two parts, and there is at least one sealing part on each part; characterized in that: The inner wall of the inner seal (200) is provided with a thorn part (210) for forming line contact with the main shaft (500); The outer wall of the inner seal (200) is provided with a pre-tightening part (300) for increasing the line contact pressure between the thorn part (210) and the main shaft (500).

2. A seal assembly according to claim 1, wherein: The thorn part (210) is provided with two thorn parts (210) forming a third compensation groove (220) between the two thorn parts (210); the outer wall of the inner seal (200) is provided with a second mounting groove (230) for mounting the pre-tightening part (300), and the two thorn parts (210) are located on the upper and lower sides of the center line of the second mounting groove (230).

3. A seal assembly according to claim 2, wherein: The two thorn parts (210) are symmetrically distributed on the two sides of the center line of the third compensation groove (220), and the center line of the second mounting groove (230) coincides with the center line of the third compensation groove (220).

4. A seal assembly according to claim 2, wherein: The outer wall of the inner seal (200) is divided by the second mounting groove (230) to form two outer lips (240) distributed above and below; in the natural expansion state of the two outer lips (240), the axial dimension of the inner seal (200) is greater than the axial dimension of the accommodating groove (110), and the radial dimension of the inner seal (200) is less than the radial dimension of the accommodating groove (110).

5. A seal assembly according to claim 1, wherein: The pre-tightening part (300) is a spring or a clamp; the accommodating groove (110) is connected to the sealing air.

6. A seal assembly according to any one of claims 1-5, characterized in that: The outer seal (100) comprises a body and a ring table arranged below the body; wherein the inner wall of the body is divided by the accommodating groove (110) to form a first sealing part (120) and a second sealing part (130), and the ring table is provided with a third sealing part (140); The second sealing part (130) and the third sealing part (140) form a first compensation groove (150), and a second compensation groove (160) extending to the outer wall of the outer seal (100) is arranged in the first compensation groove (150); and the outer wall of the ring table is provided with a pre-tightening part (300).

7. A seal assembly according to claim 6, wherein: The second sealing part (130) forms a surface contact with the main shaft (500); the third sealing part (140) forms a line contact with the main shaft (500); the outer wall of the third sealing part (140) is provided with a first mounting groove (170) for clamping the pre-tightening part (300), and the tip of the third sealing part (140) is located in the axial area occupied by the first mounting groove (170).

8. A seal assembly according to claim 6, wherein: The first sealing part (120) forms a surface contact with the main shaft (500), and the top of the first sealing part (120) forms an inclined surface (180).

9. A mill stand seal assembly for fitting on a main shaft (500), comprising a seal base (400) and a seal assembly disposed in the seal base (400), characterized in that: The sealing assembly is the sealing assembly of claim 6, wherein the third sealing part (140) extends out of the sealing base (400).

10. A mill base seal as claimed in claim 9, wherein: The sealing base (400) comprises an upper pressing plate (410), a lower pressing plate (420) and locking bolts (430) for connecting the upper and lower pressing plates; wherein the upper pressing plate (410) is arranged on the top of the body, and the lower pressing plate (420) is arranged in the clamping groove (190) formed between the body and the outer peripheral wall of the convex ring.

Images