Sealing device of reducing mill

Abstract

The utility model relates to a sealing device of a reducing mill. The sealing device comprises a sealing ring, an outer slip ring and an inner slip ring, the outer sliding ring and the inner sliding ring are oppositely arranged and are in butt joint to form an annular body, a sealing cavity is formed in the outer circumference of the annular body, and the sealing ring is arranged in the sealing cavity in a sleeved mode. The sealing ring comprises an annular middle ring part, a main lip part and auxiliary lip parts arranged at the two axial ends of the inner circumferential side of the middle ring part, and the auxiliary lip parts are closer to the central axis of the annular body than the main lip part. The outer circumferential surface and the inner circumferential surface of the main lip part are conical surfaces, and the conical angle of the inner circumferential surface of the main lip part is smaller than that of the outer circumferential surface of the main lip part. When the roller ring runs at a high speed, the outer slip ring, the inner slip ring and the sealing ring relatively rotate at a high speed, and the main lip part of the sealing ring is propped against the inner end surface of the sealing cavity to form sealing; cooling water can be prevented from entering gaps among the sealing ring, the outer slip ring and the inner slip ring through the opening end of the sealing cavity and then flowing into a lubricating oil system of the roller box.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing structures of diameter reducing machines, in particular to a sealing device of a diameter reducing machine. Background Art

[0002] In the processing of wires such as steel pipes, in order to meet the subsequent processing requirements, it is usually necessary to reduce the diameter of the wires through a reducing mill. The reducing mill rolls the high-temperature wires through roller rings. The power of the roller rings is transmitted through the roller shaft. One end of the roller shaft is set in the roller box and connected to the transmission mechanism in the roller box. The transmission mechanism in the roller box passes through lubricating oil. Since the roller ring is in direct contact with the high-temperature wire, in order to keep the roller ring at a suitable working temperature during the rolling process, the roller ring needs to be cooled by cooling water.

[0003] At present, the roller shaft and the roller box usually adopt the form of setting a single lip seal at the joint between the roller shaft and the roller box. Although the single lip seal has a simple structure and is easy to install and replace, it performs poorly when subjected to high pressure or harsh operating conditions, and is prone to side leakage or seal failure, causing cooling water to easily enter the roller box through the failed seal structure and affect the lubricating oil. Utility Model Content

[0004] The main purpose of the utility model is to provide a sealing device for a reducing mill, so as to solve the problem that the sealing structure between the roller shaft and the roller box of the existing reducing mill is easy to leak or fail, resulting in the cooling water easily flowing into the roller box.

[0005] To solve the above problems, the utility model is achieved as follows:

[0006] A sealing device for a reducing machine, comprising a sealing ring, an outer sliding ring, and an inner sliding ring; the outer sliding ring and the inner sliding ring are arranged opposite to each other and butted to form an annular body, the outer circumference of the annular body is arranged as a sealing cavity, and the sealing ring is sleeved in the sealing cavity;

[0007] The sealing ring includes an annular middle ring portion, main lips arranged at two axial ends of the middle ring portion, and auxiliary lips arranged at two axial ends of the inner circumference of the middle ring portion, wherein the auxiliary lips are closer to the central axis of the annular body than the main lips;

[0008] The outer circumferential surface and the inner circumferential surface of the main lip are both conical surfaces, and the conical angle of the inner circumferential surface of the main lip is smaller than the conical angle of the outer circumferential surface of the main lip.

[0009] Wherein, a pointed contact portion for contacting the end surface of the sealing cavity is provided at the end portion of the main lip portion away from the middle ring portion.

[0010] Wherein, the outer peripheral surface of the contact portion is a smooth straight cylindrical circular surface.

[0011] Wherein, annular abutment protrusions for contacting the corresponding auxiliary lip portions are arranged at both axial ends of the sealing cavity, and a surface of the abutment protrusion close to the central axis is arranged as a conical surface, and the conical surface of the abutment protrusion gradually shrinks in a direction away from the middle ring portion.

[0012] Wherein, the free end of the abutting protrusion is provided with an arc angle.

[0013] Wherein, annular gaskets for contacting the main lip are fitted at both axial ends of the sealing cavity, and the gasket is located on one side of the sealing cavity close to the outer circumferential surface of the annular body.

[0014] Wherein, an annular water retaining ring is arranged on the outer circumference of the outer sliding ring, and the free end of the water retaining ring is arranged opposite to the inner sliding ring.

[0015] The included angle between the two auxiliary lips is 180°.

[0016] Wherein, the inner circumferential surface of the middle ring portion is provided with an annular supporting protrusion protruding from the inner circumferential surface.

[0017] Wherein, the main lip is located at the junction of the middle ring portion and the main lip.

[0018] The beneficial effects of the utility model are:

[0019] When in use, the annular body composed of the outer sliding ring and the inner sliding ring is sleeved on the roller shaft. The annular body rotates at high speed with the roller shaft. The sealing ring is sleeved in the sealing cavity. The outer circumference of the middle ring part of the sealing ring is fixedly connected to the roller box (which can be a retaining frame, an eccentric disk, etc.). When the roller ring rotates at high speed, the annular body composed of the outer sliding ring and the inner sliding ring forms a relative high-speed rotation with the sealing ring. The main lip of the sealing ring abuts against the inner end face of the sealing cavity to form a seal, which can prevent cooling water from entering the gap between the sealing ring and the outer sliding ring and the inner sliding ring through the open end of the sealing cavity, and then flowing into the lubricating oil system of the roller box.

[0020] In addition, when the sealing structure of the utility model needs to be replaced, only one of the outer sliding ring or the inner sliding ring needs to be removed along the roller shaft and the sealing ring needs to be replaced, thereby realizing rapid replacement of the sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0022] Figure 1 It is a structural schematic diagram of the utility model;

[0023] Figure 2 yes Figure 1 The enlarged structure diagram of

[0024] Figure 3 It is a structural diagram of the sealing ring.

[0025] Description of Reference Numerals

[0026] 1. Sealing ring; 2. Outer sliding ring; 21. Water retaining ring; 3. Inner sliding ring; 4. Sealing cavity; 11. Middle ring portion; 12. Main lip portion; 121. Contact portion; 13. Auxiliary lip portion; 5. Sealing groove; 6. Abutment protrusion; 7. Gasket; 8. Support protrusion. DETAILED DESCRIPTION

[0027] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0028] like Figure 1 , Figure 2 As shown, a sealing device of a reducing machine of the utility model comprises a sealing ring 1, an outer sliding ring 2, and an inner sliding ring 3. The outer sliding ring 2 and the inner sliding ring 3 are arranged opposite to each other and butted to form an annular body, the outer circumference of the annular body is set as a sealing cavity 4, and the sealing ring 1 is sleeved in the sealing cavity 4. The sealing ring 1 is an elastic sealing ring, and the sealing ring 1 is made of rubber material, and the outer sliding ring 2 and the inner sliding ring 3 are both made of metal material. In this embodiment, the outer sliding ring 2 and the inner sliding ring 3 both include a cylindrical main ring part and an end plate coaxially arranged on the outer circumference of one axial end of the main ring part, the main ring part and the corresponding end plate are integrally formed, and an arc structure is arranged at the junction of the main ring part and the corresponding end plate, and the end plate of the outer sliding ring 2, the main ring part of the outer sliding ring 2, the end plate of the inner sliding ring 3, and the main ring part of the inner sliding ring 3 together form a sealing cavity 4. The inner circumference of the outer slip ring 2 is flush with the inner circumference of the inner slip ring 3, and the outer circumference of the outer slip ring 2 is flush with the outer circumference of the inner slip ring 3. The end plate of the outer slip ring 2 is arranged opposite to the end plate of the inner slip ring 3. In this embodiment, the inner circumference of the inner and outer slip rings refers to the side close to the central axis, that is, the circumference of one side sleeved on the roller shaft.

[0029] The sealing ring 1 includes an annular middle ring portion 11, a main lip portion 12 arranged at both axial ends of the middle ring portion 11, and auxiliary lip portions 13 arranged at both axial ends of the inner circumference of the middle ring portion 11, wherein the auxiliary lip portion 13 is closer to the central axis of the annular body than the main lip portion 12. The outer circumference and the inner circumference of the main lip portion 12 are both conical surfaces, and the conical angle of the inner circumference of the main lip portion 12 is smaller than the conical angle of the outer circumference of the main lip portion 12. This arrangement can make the thickness of the main lip portion 12 at the junction with the middle ring portion greater than the thickness of the free end, increase the connection strength of the main lip portion 12, and avoid excessive increase in the contact area between the main lip portion 12 and the sealing cavity 4 due to excessive elasticity when the main lip portion 12 abuts against the sealing cavity 4. In this embodiment, the conical angle of the inner circumference of the main lip portion 12 is between 10° and 20° smaller than the conical angle of the outer circumference of the main lip portion 12, and the structure formed by this angle difference is optimal. In this embodiment, the outer circumferential surface of the main lip 12 refers to the side thereof away from the central axis of the middle ring 11. A sealing groove 5 for installing an O-ring is provided on the inner circumference of the outer sliding ring 2 and the inner sliding ring 3. The main lip 12 is located at the junction of the middle ring 11 and the main lip 12. The inner sliding ring 3 is closer to the inside of the roller box than the outer sliding ring 2. In this embodiment, the annular body formed by the outer sliding ring 2 and the inner sliding ring 3 is sleeved on the roller shaft. The annular body rotates at high speed with the roller shaft. The sealing ring 1 is sleeved in the sealing cavity 4. The outer circumference of the middle ring of the sealing ring 1 is fixedly connected to the roller box (which can be a retaining frame, an eccentric disk, etc.). When the roller ring runs at high speed, the annular body formed by the outer sliding ring 2 and the inner sliding ring 3 forms a relative high-speed rotation with the sealing ring 1. The main lip 12 of the sealing ring abuts against the inner end surface of the sealing cavity 4 to form a seal, which can prevent cooling water from entering the gap between the sealing ring 1 and the outer sliding ring 2 and the inner sliding ring 3 through the open end of the sealing cavity 4, and then flowing into the lubricating oil system of the roller box. The setting of the auxiliary lip 13 abuts against the abutting protrusion 6 of the sealing cavity 4, which can play a further sealing role and prevent cooling water from entering the gap between the groove bottom of the sealing cavity 3 and the sealing ring 1. In addition, when the sealing structure of the utility model needs to be replaced, only one of the outer sliding ring 2 or the inner sliding ring 3 needs to be removed along the roller shaft and the sealing ring 1 can be replaced, thereby realizing rapid replacement of the sealing ring 1 .

[0030] Furthermore, the angle between the two auxiliary lips 13 is 180°, that is, the bottoms of the two auxiliary lips 13 are flush and coaxial with the middle ring portion 11. In this way, the friction between the auxiliary lips 13 and the sealing cavity 4 can be minimized while increasing the abutment strength between the auxiliary lips 13 and the abutment protrusion 6.

[0031] Refer to Figure 3The end of the main lip 12 away from the middle ring 11 is provided with a pointed contact portion 121 for contacting the end face of the sealing cavity 4. The outer circumference of the contact portion 121 is a smooth straight cylindrical circumference, which is coaxially arranged with the sealing cavity 4. The function of the contact portion 121 is to reduce the friction with the end face of the sealing cavity 4 as much as possible while contacting with the end face of the sealing cavity 4 to increase the sealing performance, and even if it is worn, the impact on the sealing effect is small, which can increase the service life of the sealing ring 1.

[0032] The two axial ends of the sealing cavity 4 are provided with annular abutting protrusions 6 for contacting the corresponding auxiliary lip portion 13. The surface of the abutting protrusion 6 close to the central axis is provided with a conical surface, and the conical surface of the abutting protrusion 6 gradually shrinks in the direction away from the middle ring portion 11. The setting of the conical surface of the abutting protrusion 6 can reduce the wear between the two while forming a contact seal with the auxiliary lip portion, thereby reducing the wear degree of the sealing ring 1. The free end of the abutting protrusion 6 is provided with an arc angle, which can reduce the wear and damage to other parts of the sealing ring 1.

[0033] The two axial ends of the sealing cavity 4 are fitted with annular gaskets 7 for contacting the main lip 12. The gasket 7 is located on one side of the sealing cavity 4 close to the outer circumferential surface of the annular body formed by the outer sliding ring 2 and the inner sliding ring 3. The gasket 7 contacts the contact portion 121 of the main lip 12 to form a sealing structure. Compared with the existing structure of "protrusions for forming a seal with the main lip at the corresponding ends of the inner and outer sliding rings", the vibration caused by collision during high-speed rotation can be reduced. In this embodiment, an annular groove for installing the gasket 7 is provided between the outer circumferential surface of the inner sliding ring and the outer circumferential surface of the abutting protrusion 6, and an annular water retaining ring 21 is provided on the outer circumference of the outer sliding ring 2. The water retaining ring 21 is integrally formed and connected with the outer sliding ring 2, and the water retaining ring 21 faces the inside of the sealing cavity 4. The gasket 7 of the outer sliding ring 2 is clamped between the inner circumference of the water retaining ring 21 and the outer circumference of the abutting protrusion 6. In this way, after the gasket 7 is worn, only the gasket 7 needs to be replaced, and the outer sliding ring 2 or the inner sliding ring 3 does not need to be replaced, which increases the service life of the outer sliding ring 2 or the inner sliding ring 3 and reduces the maintenance cost. The free end of the water retaining ring 21 is arranged opposite to the inner sliding ring 3, and the free end of the water retaining ring 21 protrudes from the inner end surface of the outer sliding ring 2. The arrangement of the water retaining ring 21 forms a high-speed airflow near the water retaining ring 21 when the outer sliding ring 2 rotates at a high speed with the roller shaft, which can prevent the cooling water outside from entering the gap between the opening end of the sealing cavity 4 and the sealing ring 1, and can preliminarily prevent the cooling water from entering the roller box.

[0034] The inner circumferential surface of the middle ring portion 11 is provided with an annular support protrusion 8 protruding from the inner circumferential surface. The support protrusion 8 is made of rubber material and is integrally formed with the middle ring portion 11. The provision of the support protrusion 8 can prevent the inner circumferential surface of the sealing ring 1 from excessively contacting the inner circumferential surface of the sealing cavity 4 when the inner and outer sliding rings rotate at high speed, and plays a supporting role.

[0035] Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

Claims

1. A sealing device for a reducing mill, characterized in that: It includes a sealing ring, an outer sliding ring and an inner sliding ring; the outer sliding ring and the inner sliding ring are arranged opposite to each other and connected to form an annular body, the outer circumference of the annular body is arranged as a sealing cavity, and the sealing ring is sleeved in the sealing cavity; The sealing ring includes an annular middle ring portion, main lips arranged at two axial ends of the middle ring portion, and auxiliary lips arranged at two axial ends of the inner circumference of the middle ring portion, wherein the auxiliary lips are closer to the central axis of the annular body than the main lips; The outer circumferential surface and the inner circumferential surface of the main lip are both conical surfaces, and the conical angle of the inner circumferential surface of the main lip is smaller than the conical angle of the outer circumferential surface of the main lip.

2. A sealing device for a reducing mill according to claim 1, characterized in that: An end portion of the main lip portion away from the middle ring portion is provided with a pointed contact portion for contacting the end surface of the sealing cavity.

3. The sealing device of a reducing mill according to claim 2, characterized in that: The outer peripheral surface of the contact portion is a smooth straight cylindrical circumferential surface.

4. The sealing device of a reducing mill according to claim 1, characterized in that: An annular abutment protrusion for contacting the corresponding auxiliary lip portion is arranged at both axial ends of the sealing cavity, and a surface of the abutment protrusion close to the central axis is arranged as a conical surface, and the conical surface of the abutment protrusion gradually shrinks in a direction away from the middle ring portion.

5. The sealing device of a reducing mill according to claim 4, characterized in that: The free end of the abutting protrusion is provided with an arc angle.

6. The sealing device of a reducing mill according to claim 1, characterized in that: An annular gasket for contacting the main lip is fitted at both axial ends of the sealing cavity, and the gasket is located on one side of the sealing cavity close to the outer circumferential surface of the annular body.

7. The sealing device of a reducing mill according to claim 1, characterized in that: An annular water retaining ring is arranged on the outer circumference of the outer sliding ring, and a free end of the water retaining ring is arranged opposite to the inner sliding ring.

8. The sealing device of a reducing mill according to claim 1, characterized in that: The included angle between the two auxiliary lips is 180°.

9. The sealing device of a reducing mill according to claim 1, characterized in that: The inner circumferential surface of the middle ring portion is provided with an annular supporting protrusion protruding from the inner circumferential surface.

10. The sealing device of a reducing mill according to claim 1, characterized in that: The main lip is located at the junction of the middle ring portion and the main lip.

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