Horizontal shaft assembly and crusher

Abstract

The invention provides a horizontal shaft assembly and a crusher. The horizontal shaft assembly comprises a first end cover, a shell, a second end cover, a shaft penetrating through the first end cover, the shell and the second end cover, a gear arranged at the end, close to the first end cover, of the shaft, a first sealing assembly arranged between the first end cover and the shaft and abutting against the first end cover and the shaft, and a second sealing assembly arranged between the first end cover and the shaft and abutting against the second end cover. The first sealing assembly comprises at least two first sealing parts which abut against each other. The second sealing assembly is arranged between the second end cover and the shaft, abuts against the second end cover and the shaft and comprises at least two second sealing parts which abut against each other. By means of the scheme, the speed that lubricating oil loaded in the cavity of the horizontal shaft assembly leaks to the external environment and other parts of the crusher can be reduced, the probability of clamping stagnation faults of the horizontal shaft assembly is reduced, the oil sealing time of the horizontal shaft assembly is prolonged, the shutdown frequency of the cone crusher is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ore crushing, and in particular to a horizontal shaft assembly and a crusher. Background Art

[0002] In the iron ore crushing process, cone crusher is an important production equipment. Cone crusher is a tool used to crush ore, and the quality of cone crusher has a great impact on production. In the process of crushing iron ore, the horizontal shaft assembly of cone crusher is prone to oil leakage and other problems, which leads to high maintenance frequency of cone crusher, which has a great impact on production efficiency. Summary of the invention

[0003] In view of this, the present invention proposes a horizontal shaft assembly and a crusher, which solve the problems of lubricating oil cross-cone and leakage that are prone to occur in the horizontal shaft assembly of related cone crusher equipment.

[0004] On the one hand, an embodiment of the present invention provides a horizontal shaft assembly for a crusher, the horizontal shaft assembly comprising: A first end cover, a housing, and a second end cover connected in sequence; a shaft passing through the first end cap, the housing, and the second end cap; A gear, arranged at one end of the shaft close to the first end cover; A first sealing assembly is disposed between the first end cover and the shaft and abuts against the first end cover and the shaft respectively, the first sealing assembly comprising at least two first sealing components abutting against each other; The second sealing assembly is arranged between the second end cover and the shaft and abuts against the second end cover and the shaft respectively. The second sealing assembly includes at least two second sealing components abutting against each other.

[0005] In some embodiments, the first sealing assembly includes two first sealing components abutting against each other; the second sealing assembly includes two second sealing components abutting against each other; The first end cover is provided with a first groove, and the second end cover is provided with a second groove; The first sealing assembly is arranged in the first groove and sleeved on the shaft; The second sealing component is arranged in the second groove and sleeved on the shaft.

[0006] In some embodiments, the horizontal axis assembly further comprises: a third sealing member; The outer side of the shell is provided with an assembly surface for assembling with the lower frame assembly of the crusher. The assembly surface is provided with a third groove, and the third sealing component is clamped in the third groove.

[0007] In some embodiments, the third sealing component is an O-ring, and a cross-sectional length of the O-ring along the first direction is greater than a depth of the third groove along the first direction.

[0008] In some embodiments, the horizontal axis assembly further comprises: A first spacer sleeve is connected to the shaft and arranged opposite to the first end cover, and at least two first sealing components are sleeved on the first spacer sleeve.

[0009] In some embodiments, the horizontal axis assembly further comprises: A second spacer sleeve is connected to the shaft and arranged opposite to the second end cover, and at least two second sealing components are sleeved on the second spacer sleeve.

[0010] In some embodiments, the horizontal axis assembly further comprises: A first bearing located at an end of the first end cover away from the gear and abutting against the shaft; The second end cover is located at one end close to the gear and abuts against the second bearing on the shaft.

[0011] In some embodiments, the first sealing component and the second sealing component are both O-rings.

[0012] On the other hand, an embodiment of the present invention further provides a crusher, the crusher comprising a horizontal shaft assembly, the horizontal shaft assembly comprising: A first end cover, a housing, and a second end cover connected in sequence; a shaft passing through the first end cap, the housing, and the second end cap; A gear, arranged at one end of the shaft close to the first end cover; A first sealing assembly is disposed between the first end cover and the shaft and abuts against the first end cover and the shaft respectively, the first sealing assembly comprising at least two first sealing components abutting against each other; The second sealing assembly is arranged between the second end cover and the shaft and abuts against the second end cover and the shaft respectively. The second sealing assembly includes at least two second sealing components abutting against each other.

[0013] In some embodiments, the first sealing assembly includes two first sealing components abutting against each other; the second sealing assembly includes two second sealing components abutting against each other; The first end cover is provided with a first groove, and the second end cover is provided with a second groove; The first sealing assembly is arranged in the first groove and sleeved on the shaft; The second sealing component is arranged in the second groove and sleeved on the shaft.

[0014] In some embodiments, the horizontal shaft assembly of the crusher further comprises: a third sealing member; The outer side of the shell is provided with an assembly surface for assembling with the lower frame assembly of the crusher. The assembly surface is provided with a third groove, and the third sealing component is clamped in the third groove.

[0015] The present invention has at least the following beneficial effects: The present invention provides a horizontal shaft assembly and a crusher. The horizontal shaft assembly provided by the present invention may include: a first end cover, a shell, and a second end cover connected in sequence, a shaft passing through the first end cover, the shell, and the second end cover, a gear arranged at one end of the shaft close to the first end cover, at least two first sealing components abutting against each other, and at least two second sealing components abutting against each other. The first end cover is provided with a first groove, and the second end cover is provided with a second groove. At least two first sealing components abutting against each other are arranged in the first groove, and at least two second sealing components abutting against each other are arranged in the second groove. The scheme of the present invention, by providing a plurality of sealing components, greatly slows down the speed at which the lubricating oil loaded in the cavity of the horizontal shaft assembly leaks to the external environment and other components of the cone crusher, reduces the probability of a stuck fault of the horizontal shaft assembly, prolongs the oil sealing time of the horizontal shaft assembly, reduces the downtime frequency of the cone crusher, and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the structure of a horizontal shaft assembly provided by an embodiment of the present invention; Figure 2a A schematic structural diagram of a third sealing component of a horizontal shaft assembly provided by an embodiment of the present invention; Figure 2b for Figure 2a The schematic cross-sectional view of the third sealing component along the AA direction is shown.

[0018] [Description of Reference Numerals] 10: first end cover; 11: first groove; 20: housing; 21: assembly surface; 22: third groove; 30: second end cover; 31: second groove; 40: shaft; 50: gear; 60: first sealing component; 70: second sealing component; 80: third sealing component; 90: first spacer; 100: second spacer; 110: first bearing; 120: second bearing. DETAILED DESCRIPTION

[0019] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0020] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0021] In the iron ore crushing process, cone crusher is an important production equipment. Cone crusher is a tool used to crush iron ore. The reliability of cone crusher has a great impact on production. In the process of crushing iron ore, the horizontal shaft assembly of cone crusher is prone to oil leakage and other problems, which leads to high maintenance frequency of cone crusher, which has a great impact on production efficiency.

[0022] In some examples, the related cone crusher includes a lower frame assembly and a horizontal shaft assembly, and there is a clearance fit between the lower frame assembly and the horizontal shaft.

[0023] The lower frame assembly has an independent circulating lubrication system, through which the lubricating oil flows out from the main lubrication tank under the action of pressure, enters the lower frame assembly through the oil inlet of the lower frame assembly, lubricates the eccentric sleeve, gears and other components of the lower frame assembly, and returns to the main lubricating oil tank from the lubricating oil outlet of the lower frame assembly.

[0024] The horizontal shaft assembly has an independent circulation lubrication system, which lubricates the bearings and other parts of the horizontal shaft assembly. The lubricating oil of the circulation lubrication system of the horizontal shaft assembly flows out from the horizontal shaft lubricating oil tank, enters the horizontal shaft assembly through the oil inlet of the horizontal shaft assembly, and returns to the horizontal shaft lubricating oil tank from the oil outlet of the horizontal shaft assembly.

[0025] The horizontal shaft assembly has oil seals at both ends along the horizontal direction, and the oil seals are single oil seals. After the oil seal at one end of the horizontal shaft assembly close to the external environment is damaged, the lubricating oil in the horizontal shaft assembly will leak into the external environment, thereby polluting the environment, and with the leakage of the lubricating oil, the lubrication effect will gradually decrease, which may easily cause the horizontal shaft to get stuck and other faults. After the oil seal at one end of the horizontal shaft assembly close to the lower frame assembly is damaged, the lubricating oil in the horizontal shaft assembly will leak into the lower frame assembly and return to the main lubricating oil tank from the oil outlet of the lower frame assembly, causing oil cross-talk, polluting the lubricating oil in the main lubricating oil tank, and affecting the lubrication effect.

[0026] In addition, due to the clearance fit between the lower frame assembly and the horizontal shaft, the lubricating oil in the lower frame assembly enters the cavity formed between the lower frame assembly and the horizontal shaft assembly through the inner assembly surface. After the sealant coated on the outer assembly surface ages and breaks, the lubricating oil of the lower frame assembly leaked into the cavity will leak into the external environment through the outer assembly surface, thereby polluting the environment, affecting the lubrication effect, and causing the horizontal shaft assembly to jam and other faults.

[0027] In order to ensure that the horizontal axis will not have malfunctions caused by damaged oil seals, the cone crusher needs to be shut down for maintenance frequently, which greatly affects the production efficiency of the cone crusher. In addition, since the maintenance environment is not dust-free, maintenance of the horizontal axis assembly of the cone crusher in a dusty environment is also likely to cause the oil seal of the horizontal axis assembly to be damaged, increasing operating costs and the probability of accidents.

[0028] In view of this, in order to solve at least one of the above technical problems, the present invention provides a horizontal shaft assembly and a crusher. The present invention is described in detail below in conjunction with embodiments and drawings.

[0029] A first aspect of an embodiment of the present invention provides a horizontal shaft assembly that can be used in a crusher, such as a cone crusher, but is not limited thereto, and can also be other crushers used for crushing metal ores.

[0030] like Figure 1 As shown, the horizontal shaft assembly provided by the embodiment of the present invention may include: a first end cover 10, a shell 20, and a second end cover 30 connected in sequence, a shaft 40 passing through the first end cover 10, the shell 20 and the second end cover 30, a gear 50 arranged at one end of the shaft close to the first end cover, a first sealing component arranged between the first end cover 10 and the shaft 40 and respectively abutting against the first end cover 10 and the shaft 40, the first sealing component including at least two first sealing components 60 abutting against each other; a second sealing component arranged between the second end cover 30 and the shaft 40 and respectively abutting against the second end cover 30 and the shaft 40, the second sealing component including at least two second sealing components 70 abutting against each other.

[0031] The embodiment of the present invention greatly reduces the speed at which the lubricating oil loaded in the cavity of the horizontal shaft assembly leaks to the external environment and other components of the cone crusher by arranging multiple first sealing components between the first end cover and the shaft and arranging multiple second sealing components between the second end cover and the shaft, reduces the probability of the horizontal shaft assembly jamming, prolongs the oil sealing time of the horizontal shaft assembly, reduces the shutdown frequency of the cone crusher, and improves production efficiency.

[0032] In some embodiments of the present invention, Figure 1As shown, the first sealing assembly may include two first sealing components 60 abutting against each other; the second sealing assembly may include two second sealing components 70 abutting against each other. The first end cover 10 is provided with a first groove 11, and the second end cover 30 is provided with a second groove 31; the two first sealing components 60 abutting against each other of the first sealing assembly are arranged in the first groove 11 and sleeved on the shaft 40; the two second sealing components 70 abutting against each other of the second sealing assembly are arranged in the second groove 31 and sleeved on the shaft 40.

[0033] Specifically, the material of the first end cover 10 can be metal, such as stainless steel, to improve the overall strength and reliability of the horizontal shaft assembly and reduce the probability of failure of the horizontal shaft assembly.

[0034] The material of the housing 20 may be metal, such as stainless steel, to improve the overall strength and reliability of the horizontal shaft assembly and reduce the probability of failure of the horizontal shaft assembly.

[0035] The material of the second end cover 30 can be metal, such as stainless steel, to improve the overall strength and reliability of the horizontal shaft assembly.

[0036] The connection between the first end cover 10, the housing 20 and the second end cover 30 may be a detachable connection, such as a detachable connection by bolts, so that the horizontal shaft assembly can be easily repaired and parts replaced.

[0037] The connection between the shaft 40 and the housing 20 is a rotational connection, and the rotational connection between the shaft 40 and the housing 20 is achieved by assembling a rotatable component, such as a bearing, on the shaft 40.

[0038] The material of the gear 50 can be metal, such as stainless steel, to improve the overall strength and reliability of the horizontal shaft assembly and reduce the probability of failure of the horizontal shaft assembly.

[0039] The gear 50 and the shaft may be fixedly connected, for example, by welding, so as to improve the overall strength and reliability of the horizontal shaft assembly and reduce the probability of failure of the horizontal shaft assembly.

[0040] The first sealing component 60 and the second sealing component 70 may be made of non-metallic materials, such as rubber. The first sealing component 60 and the second sealing component 70 may be sealing rings, such as O-rings.

[0041] A cavity is formed between the first end cover 10, the housing 20, the second end cover 30 and the shaft of the horizontal shaft assembly. When the horizontal shaft assembly is in operation, the first sealing component 60 close to the second end cover 30 and the second sealing structure 70 close to the first end cover 10 are in direct contact with the lubricating oil loaded in the cavity, respectively, and the other first and second sealing structures do not contact the lubricating oil. The first sealing component 60 close to the second end cover and the second sealing structure 70 close to the first end cover 10 will contact the lubricating oil only after being worn out due to long-term use. Therefore, by setting up multiple sealing components, the speed at which the lubricating oil loaded in the cavity of the horizontal shaft assembly leaks to the external environment and other components of the cone crusher is greatly slowed down, the probability of the horizontal shaft assembly being stuck is reduced, the oil sealing time of the horizontal shaft assembly is extended, the downtime frequency of the cone crusher is reduced, and the production efficiency is improved.

[0042] In some embodiments of the present invention, Figure 1 The horizontal shaft assembly shown may include: two first sealing components 60 disposed in the first groove 11 and abutting against each other; and two second sealing components 71 disposed in the second groove 31 and abutting against each other. Thus, the length of the horizontal shaft assembly is reduced, and the space occupied by the horizontal shaft assembly is reduced.

[0043] In some embodiments of the present invention, Figure 1 The horizontal shaft assembly shown may further include a third sealing component 80. The outer side of the housing has an assembly surface 21 for assembly with the lower frame assembly of the crusher. The assembly surface 21 is provided with a third groove 22, and the third sealing component 80 is clamped in the third groove 22.

[0044] The assembly surface 21 is the assembly surface of the horizontal axis assembly close to the external environment. By clamping the third sealing component 80 in the third groove of the assembly surface 21, the lubricating oil can be prevented from leaking into the cavity formed by the lower frame assembly and the horizontal axis assembly and leaking into the external environment through the assembly surface 21, thereby avoiding pollution of the external environment and reduction in the lubrication effect of the lower frame assembly due to the leakage of lubricating oil into the external environment, thereby reducing the probability of a sticking failure of the horizontal axis assembly.

[0045] In some embodiments of the present invention, reference Figure 1 and Figure 2a , Figure 2b The third sealing component 80 of the horizontal shaft assembly is an O-type sealing ring. The cross-sectional length D1 of the O-type sealing ring along the first direction X is greater than the depth of the third groove 22 along the first direction X.

[0046] By making the cross-sectional length D1 of the O-ring along the first direction X greater than the depth of the third groove 22 along the first direction X, the sealing effect of the horizontal axis assembly and the lower frame assembly at the assembly surface can be ensured, thereby preventing the lubricating oil leaking into the cavities of the lower frame assembly and the horizontal axis assembly from leaking to the external environment and polluting the external environment, thereby reducing the probability of a sticking failure of the horizontal axis assembly.

[0047] In some examples, in order to facilitate the assembly of the horizontal shaft assembly and the lower frame assembly while ensuring the sealing effect of the horizontal shaft assembly and the lower frame assembly at the assembly surface, the difference between the cross-sectional length D1 of the O-ring along the first direction X and the depth of the third groove 22 along the first direction X can be made D satisfies the following relationship: 1mm≤ D≤5mm.

[0048] In some embodiments of the present invention, Figure 1 The horizontal shaft assembly shown may further include: a first spacer sleeve 90 connected to the shaft 40 and disposed opposite to the first end cover 10. At least two first sealing components 60 may be sleeved on the first spacer sleeve 90.

[0049] The material of the first spacer 90 can be metal, such as stainless steel, to improve the overall strength and reliability of the horizontal shaft assembly.

[0050] The first spacer 90 and the shaft 40 may be connected in a detachable manner. For example, the first spacer 90 may be pressed onto the shaft 40 by ensuring that the dimensions of the first spacer 90 and the shaft 40 are interference fit.

[0051] By fitting the first sealing member 60 onto the first spacer 90, the shaft can be prevented from being worn out during long-term use, thereby reducing the sealing effect. The wear of the shaft 40 is replaced by the wear of the first spacer 90, so that the shaft can be avoided from being replaced due to excessive wear.

[0052] In some embodiments of the present invention, Figure 1 The horizontal shaft assembly shown may further include: a second spacer sleeve 100 connected to the shaft 40 and disposed opposite to the second end cover 30. At least two second sealing components 70 may be sleeved on the second spacer sleeve 100.

[0053] The material of the second spacer 100 can be metal, such as stainless steel, to improve the overall strength and reliability of the horizontal shaft assembly.

[0054] The second spacer 100 and the shaft 40 may be detachably connected. For example, the second spacer 100 may be pressed onto the shaft 40 by ensuring that the dimensions of the second spacer 100 and the shaft 40 are interference fit.

[0055] By fitting the second sealing member 70 onto the second spacer 100, the shaft can be prevented from being worn out during long-term use, thereby reducing the sealing effect. The wear of the shaft 40 is replaced by the wear of the second spacer 100, so that the shaft can be avoided from being replaced due to excessive wear.

[0056] In some embodiments of the present invention, Figure 1 The horizontal shaft assembly shown may also include: a first bearing 110 located at an end of the first end cover 10 away from the gear 50 and abutting against the shaft 40; and a second bearing 120 located at an end of the second end cover 30 close to the gear 50 and abutting against the shaft 40.

[0057] By arranging the first bearing 110 and the second bearing 120 on the shaft 40 , a rotatable connection between the shaft 40 and the housing 20 is achieved.

[0058] Based on the same inventive concept, according to another aspect of the present invention, an embodiment of the present invention further provides a crusher, the crusher includes a horizontal shaft assembly, and the horizontal shaft assembly may include: A first end cover, a housing, and a second end cover connected in sequence; a shaft passing through the first end cap, the housing, and the second end cap; A gear, arranged at one end of the shaft close to the first end cover; A first sealing assembly is disposed between the first end cover and the shaft and abuts against the first end cover and the shaft respectively, the first sealing assembly comprising at least two first sealing components abutting against each other; The second sealing assembly is arranged between the second end cover and the shaft and abuts against the second end cover and the shaft respectively. The second sealing assembly includes at least two second sealing components abutting against each other.

[0059] The crusher of the embodiment of the present invention, by arranging multiple sealing components in the horizontal shaft assembly of the crusher, slows down the speed at which the lubricating oil loaded in the cavity of the horizontal shaft assembly leaks to the external environment and the lower frame assembly of the crusher, avoids oil cross-talk between the horizontal shaft assembly and the lower frame assembly, reduces the probability of sticking failure of the horizontal shaft assembly, extends the oil sealing time of the horizontal shaft assembly, reduces the shutdown frequency of the cone crusher, and improves production efficiency.

[0060] In some embodiments of the present invention, the first sealing assembly includes two first sealing components abutting against each other; the second sealing assembly includes two second sealing components abutting against each other; The first end cover is provided with a first groove, and the second end cover is provided with a second groove; The first sealing assembly is arranged in the first groove and sleeved on the shaft; The second sealing component is arranged in the second groove and sleeved on the shaft.

[0061] In some embodiments of the present invention, the horizontal shaft assembly of the crusher may further include: a third sealing member; The outer side of the shell is provided with an assembly surface for assembling with the lower frame assembly of the crusher. The assembly surface is provided with a third groove, and the third sealing component is clamped in the third groove.

[0062] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A horizontal shaft assembly, characterized in that: For crushers, including: A first end cover, a housing, and a second end cover connected in sequence; a shaft passing through the first end cap, the housing, and the second end cap; a gear, disposed at one end of the shaft close to the first end cover; a first sealing assembly disposed between the first end cover and the shaft and abutting against the first end cover and the shaft respectively, wherein the first sealing assembly comprises at least two first sealing components abutting against each other; A second sealing assembly is disposed between the second end cover and the shaft and abuts against the second end cover and the shaft respectively, wherein the second sealing assembly includes at least two second sealing components abutting against each other.

2. The horizontal shaft assembly according to claim 1, characterized in that: The first sealing assembly includes two first sealing components abutting against each other; the second sealing assembly includes two second sealing components abutting against each other; The first end cover is provided with a first groove, and the second end cover is provided with a second groove; The first sealing assembly is disposed in the first groove and sleeved on the shaft; The second sealing assembly is disposed in the second groove and sleeved on the shaft.

3. The horizontal shaft assembly according to claim 1, characterized in that: Also includes: a third sealing member; The outer side of the shell has an assembly surface for assembling with the lower frame assembly of the crusher, and the assembly surface is provided with a third groove, and the third sealing component is clamped in the third groove.

4. The horizontal shaft assembly according to claim 3, characterized in that: The third sealing component is an O-type sealing ring, and a cross-sectional length of the O-type sealing ring along a first direction is greater than a depth of the third groove along the first direction.

5. The horizontal shaft assembly according to claim 1, characterized in that: Also includes: A first spacer sleeve is connected to the shaft and arranged opposite to the first end cover, and the at least two first sealing components are sleeved on the first spacer sleeve.

6. The horizontal shaft assembly according to claim 5, characterized in that: Also includes: A second spacer sleeve is connected to the shaft and arranged opposite to the second end cover, and the at least two second sealing components are sleeved on the second spacer sleeve.

7. The horizontal shaft assembly according to claim 1, characterized in that: Also includes: A first bearing located at an end of the first end cover away from the gear and abutting against the shaft; The second end cover is located at one end close to the gear and abuts against the shaft.

8. The horizontal shaft assembly according to claim 1, characterized in that: The first sealing component and the second sealing component are both O-rings.

9. A crusher, characterized in that: The invention comprises a horizontal shaft assembly, wherein the horizontal shaft assembly comprises: A first end cover, a housing, and a second end cover connected in sequence; a shaft passing through the first end cap, the housing, and the second end cap; a gear, disposed at one end of the shaft close to the first end cover; a first sealing assembly disposed between the first end cover and the shaft and abutting against the first end cover and the shaft respectively, wherein the first sealing assembly comprises at least two first sealing components abutting against each other; A second sealing assembly is disposed between the second end cover and the shaft and abuts against the second end cover and the shaft respectively, wherein the second sealing assembly includes at least two second sealing components abutting against each other.

10. The crusher according to claim 9, characterized in that The first sealing assembly includes two first sealing components abutting against each other; the second sealing assembly includes two second sealing components abutting against each other; The first end cover is provided with a first groove, and the second end cover is provided with a second groove; The first sealing assembly is disposed in the first groove and sleeved on the shaft; The second sealing assembly is disposed in the second groove and sleeved on the shaft.

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