Bearing structure for outer rotor mining flame-proof permanent magnet electric roller

Abstract

The utility model discloses a bearing structure for an outer rotor mining flame-proof permanent magnet electric roller, which relates to the technical field of electric rollers and comprises a rotating shaft which is a transmission core shaft body. The outer bearing sleeve is mounted on the outer circle of the spherical roller bearing; the bearing inner cover is connected to the rotating shaft in a sleeving manner; the end cover is mounted on the outer bearing sleeve; the spherical roller bearing is connected to the rotating shaft in a sleeving manner; the bearing outer cover is connected to the rotating shaft in a sleeving manner; and the elastic check ring for the shaft is arranged in the groove of the rotating shaft, and the elastic check ring for the shaft is used for limiting the axial movement of the spherical roller bearing on the rotating shaft. According to the utility model, through the interference fit between the outer bearing sleeve and the rotating shaft, the influence of the fit clearance between the bearing outer ring and the end cover bearing chamber is eliminated, and the minimum clearance of the explosion-proof surface of the rotating shaft is increased from 5 threads (0.05 mm) to 15 threads (0.15 mm) only by considering the self clearance of the bearing, so that the locking risk is obviously reduced.

Description

Technical Field

[0001] This utility model relates to the field of electric drum technology, specifically to a bearing structure for an external rotor explosion-proof permanent magnet electric drum for mining. Background Technology

[0002] A permanent magnet electric drum is a high-efficiency and energy-saving drive device that integrates a permanent magnet motor and a drive drum. It is widely used in material conveying systems such as belt conveyors. The working principle of the permanent magnet electric drum is based on the characteristics of a permanent magnet synchronous motor. It uses high-performance permanent magnet materials (such as neodymium iron boron) to create a strong magnetic field. When a three-phase alternating current of a specific frequency is applied, a rotating magnetic field is generated, thereby driving the drum to rotate. The bearing structure of the permanent magnet electric drum is one of the key components for its efficient and reliable operation.

[0003] Traditional external rotor explosion-proof permanent magnet electric drums for mining use use spherical roller bearings (self-aligning roller bearings). These bearings have large clearances, and the fit clearances between the inner cover stop and the end cover bearing chamber, as well as between the outer ring of the bearing and the end cover bearing chamber, further reduce the already small gap of the explosion-proof surface of the shaft, often leading to the shaft explosion-proof surface seizing up. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art; to this end, the present invention proposes a bearing structure for an external rotor explosion-proof permanent magnet electric drum for mining.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A bearing structure for an external rotor explosion-proof permanent magnet electric drum used in mining, comprising:

[0007] A rotating shaft, which is the core shaft of the transmission system;

[0008] An outer bearing sleeve is mounted on the outer circumference of a spherical roller bearing;

[0009] The bearing inner cover is sleeved on the rotating shaft;

[0010] End cap, which is mounted on the outer bearing sleeve;

[0011] A spherical roller bearing, wherein the spherical roller bearing is fitted onto a rotating shaft;

[0012] A bearing outer cover, which is fitted onto the rotating shaft;

[0013] A shaft retaining ring is installed in a groove of a rotating shaft and is used to restrict the axial movement of the spherical roller bearing on the rotating shaft.

[0014] A skeleton oil seal is installed in a groove in the outer cover of the bearing and is used for sealing.

[0015] As a further embodiment of this utility model: the bearing outer cover is fixed to the end cover by an internal hexagon screw.

[0016] As a further aspect of this utility model, the inner ring of the spherical roller bearing is interference-fitted with the shaft.

[0017] As a further embodiment of this utility model: the outer bearing sleeve is interference-fitted with the outer ring of the spherical roller bearing and its axial position is fixed by an end cap.

[0018] As a further embodiment of this utility model: the outer bearing sleeve cooperates with the rotating shaft to form an explosion-proof surface, the inner bearing cover cooperates with the outer bearing sleeve to form a cylindrical explosion-proof surface, and the inner bearing cover cooperates with the end cover to form a planar explosion-proof surface.

[0019] As a further aspect of this utility model, the minimum gap between the axial explosion-proof surfaces is not less than 15 mils.

[0020] As a further embodiment of this utility model: the shaft is fitted with an elastic retaining ring that is inserted into the groove of the rotating shaft and fits tightly against the inner end face of the rotating shaft.

[0021] As a further embodiment of this utility model: the lip of the skeleton oil seal is in a movable seal with the rotating shaft.

[0022] The beneficial effects of this utility model are:

[0023] (1) In this utility model, the interference fit between the outer bearing sleeve and the shaft eliminates the influence of the fit clearance between the outer ring of the bearing and the bearing chamber of the end cover. Only the bearing clearance itself needs to be considered. The minimum clearance of the explosion-proof surface of the shaft is increased from 5 mils (0.05 mm) to 15 mils (0.15 mm), which significantly reduces the risk of seizure.

[0024] (2) In this utility model, by relaxing the machining tolerance requirements of the explosion-proof surface of the rotating shaft, the traditional copper sleeve structure is eliminated, reducing manufacturing costs and maintenance difficulty. Furthermore, the axial displacement of the spherical roller bearing is limited by the elastic retaining ring of the shaft, and the skeleton oil seal prevents dust intrusion and extends the bearing life. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] Figure 1 This is a cross-sectional structural diagram of the present invention. Figure 1 ;

[0027] Figure 2 This is a cross-sectional structural diagram of the present invention. Figure 2 ;

[0028] Figure 3 This is a cross-sectional structural diagram of the outer bearing sleeve of this utility model.

[0029] In the diagram: 1. Shaft; 2. Outer bearing sleeve; 3. Inner bearing cover; 4. End cover; 5. Spherical roller bearing; 6. Outer bearing cover; 7. Shaft retaining ring; 8. Oil seal; 9. Socket head screw. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0031] Example

[0032] Please see Figures 1-3 As shown, this utility model is a bearing structure for an external rotor explosion-proof permanent magnet electric drum used in mining, characterized by comprising:

[0033] Rotating shaft 1, rotating shaft 1 is the core shaft of the transmission;

[0034] It should be noted that shaft 1, as the core shaft for power transmission, bears the outer rotor and load torque.

[0035] Outer bearing sleeve 2 is mounted on the outer circle of spherical roller bearing 5;

[0036] It should be noted that the outer bearing sleeve 2 is a key component that fixes the outer ring of the spherical roller bearing 5 to form the explosion-proof surface.

[0037] Bearing inner cover 3, bearing inner cover 3 is sleeved on rotating shaft 1;

[0038] It should be noted that the function of the bearing inner cover 3 is to provide composite explosion protection and axial positioning.

[0039] End cap 4, which is installed on the outer bearing sleeve 2;

[0040] It should be noted that the end cap 4 is used to seal the bearing chamber and support the outer bearing sleeve 2.

[0041] Spherical roller bearing 5 is sleeved on shaft 1;

[0042] It should be noted that the spherical roller bearing 5 is used to support the rotating shaft 1 and adapt to the eccentric load of the outer rotor, providing a self-aligning function.

[0043] Bearing outer cover 6, bearing outer cover 6 is sleeved on rotating shaft 1;

[0044] It should be noted that the bearing outer cover 6 is used to seal the bearing chamber and fix the skeleton oil seal 8.

[0045] A shaft elastic retaining ring 7 is installed in the groove of the rotating shaft 1. The shaft elastic retaining ring 7 is used to limit the axial movement of the spherical roller bearing 5 on the rotating shaft 1.

[0046] It should be noted that the shaft elastic retaining ring 7 is used to limit the axial displacement of the spherical roller bearing 5.

[0047] The skeleton oil seal 8 is installed in the groove of the bearing outer cover 6 and is used for sealing.

[0048] It should be noted that the skeleton oil seal 8 is used to prevent external dust from entering the bearing chamber and to retain lubricating grease.

[0049] In a preferred embodiment, the bearing outer cover 6 is threaded onto the end cover 4 by an internal hex screw 9.

[0050] As a preferred embodiment, the inner ring of the spherical roller bearing 5 is interference-fitted with the shaft 1.

[0051] In a preferred embodiment, the outer bearing sleeve 2 is interference-fitted with the outer ring of the spherical roller bearing 5 and its axial position is fixed by the end cover 4.

[0052] In a preferred embodiment, the outer bearing sleeve 2 and the rotating shaft 1 cooperate to form an explosion-proof surface, the inner bearing cover 3 and the outer bearing sleeve 2 cooperate to form a cylindrical explosion-proof surface, and the inner bearing cover 3 and the end cover 4 cooperate to form a planar explosion-proof surface.

[0053] As a preferred implementation, the minimum gap between the axial explosion-proof surfaces is not less than 15 micrometers.

[0054] In a preferred embodiment, the shaft elastic retaining ring 7 is inserted into the groove of the rotating shaft 1 and fits tightly against the inner end face of the rotating shaft 1.

[0055] As a preferred embodiment, the lip of the skeleton oil seal 8 is in a movable seal with the rotating shaft 1.

[0056] The working principle of this utility model is as follows: the rotating shaft 1 and the outer bearing sleeve 2 are interference-fitted on the outer ring of the spherical roller bearing 5 and form a rotating shaft explosion-proof surface (15 mil gap) with the rotating shaft 1. The interference fit eliminates the problem of gap superposition in the traditional structure.

[0057] It is fitted onto the rotating shaft 1 and forms a cylindrical explosion-proof surface with the cylindrical stop of the outer bearing sleeve 2. At the same time, it forms a planar explosion-proof surface with the planar stop of the end cover 4, providing a double seal to prevent the transmission of explosive gas.

[0058] The end cap 4 and the bearing outer cover 6 are fixed by hexagon socket screws 9. The groove of the bearing outer cover 6 is embedded with a skeleton oil seal 8 to achieve dynamic sealing and block external dust and moisture.

[0059] The shaft elastic retaining ring 7 is inserted into the groove of the rotating shaft 1 to limit the axial displacement of the spherical roller bearing 5 and ensure stable bearing clearance;

[0060] The explosion pressure is gradually attenuated through multiple explosion-proof surfaces (axial explosion-proof surface, cylindrical explosion-proof surface, and planar explosion-proof surface) to prevent the flame or high-temperature gas from being transmitted to the external environment.

[0061] The sealing design of the skeleton oil seal 8 and the bearing outer cover 6 further prevents dust from entering the bearing cavity, avoiding the risk of explosion caused by friction heating.

[0062] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A bearing structure for an external rotor explosion-proof permanent magnet electric drum used in mining, characterized in that, include Rotating shaft (1), wherein the rotating shaft (1) is the core shaft of the transmission; An outer bearing sleeve (2) is mounted on the outer circle of a spherical roller bearing (5); The bearing inner cover (3) is sleeved on the rotating shaft (1); End cap (4), said end cap (4) is mounted on outer bearing sleeve (2); A spherical roller bearing (5) is fitted onto a rotating shaft (1); Bearing outer cover (6), which is sleeved on the rotating shaft (1); A shaft elastic retaining ring (7) is installed in a groove of the rotating shaft (1) and is used to restrict the axial movement of the spherical roller bearing (5) on the rotating shaft (1). A skeleton oil seal (8) is installed in a groove of the bearing outer cover (6) and is used for sealing.

2. The bearing structure for an external rotor explosion-proof permanent magnet electric drum for mining as described in claim 1, characterized in that, The bearing cover (6) is threaded onto the end cover (4) by an internal hexagon screw (9).

3. The bearing structure for an external rotor explosion-proof permanent magnet electric drum for mining as described in claim 1, characterized in that, The inner ring of the spherical roller bearing (5) is interference-fitted with the shaft (1).

4. The bearing structure for an external rotor explosion-proof permanent magnet electric drum for mining as described in claim 1, characterized in that, The outer bearing sleeve (2) is interference-fitted with the outer ring of the spherical roller bearing (5) and its axial position is fixed by the end cover (4).

5. The bearing structure for an external rotor explosion-proof permanent magnet electric drum for mining as described in claim 1, characterized in that, The outer bearing sleeve (2) and the rotating shaft (1) cooperate to form an explosion-proof surface, the inner bearing cover (3) and the outer bearing sleeve (2) cooperate to form a cylindrical explosion-proof surface, and the inner bearing cover (3) and the end cover (4) cooperate to form a planar explosion-proof surface.

6. The bearing structure for an external rotor explosion-proof permanent magnet electric drum for mining as described in claim 5, characterized in that, The minimum gap between the explosion-proof surfaces of the shaft is not less than 15 mils.

7. The bearing structure for an external rotor explosion-proof permanent magnet electric drum for mining as described in claim 1, characterized in that, The shaft uses an elastic retaining ring (7) to be inserted into the groove of the rotating shaft (1) and to fit tightly against the inner end face of the rotating shaft (1).

8. The bearing structure for an external rotor explosion-proof permanent magnet electric drum for mining as described in claim 1, characterized in that, The lip of the skeleton oil seal (8) is in a movable seal with the rotating shaft (1).

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