Bearing limiting structure type vibrating screen vibrating motor

Abstract

This invention relates to the field of screening equipment technology, specifically to a vibrating motor for a bearing-limiting structure vibrating screen. It includes a motor stator housing with a motor rotor rotatably mounted within its inner cavity, and further includes: two bearing seats, symmetrically and detachably mounted at both ends of the motor stator housing, each with a shaft cavity at its center and a bearing cavity on one side for mounting the bearing body; two motor end caps, detachably and symmetrically mounted outside the bearing seats, each with a shaft hole at its center; and a gradient diameter shaft along the axial direction of the motor rotor, which is sequentially inserted through the shaft cavity, bearing body, and shaft hole from the inside out. This invention solves the problems of frequent bearing seizure and bearing damage in traditional motors, allowing the production line to operate continuously and stably for extended periods, thus increasing output. It also features multiple protective structures to prevent wear and tear on the bearing body and motor rotor under high-frequency vibration, thus preventing vibrating motor failures at their structural root.

Description

Technical Field

[0001] This invention relates to the field of screening equipment technology, and specifically to a vibrating motor for a bearing-limiting structure vibrating screen. Background Technology

[0002] In the production process of povidone, the vibrating screen is the core equipment in the product screening process. The vibrating motor installed at the bottom of the screen drives the screen body to vibrate by generating high-frequency excitation force, thereby realizing the classification and screening of materials. In the existing technology, the vibrating screens matched with this type of production line usually adopt conventional structure vibrating motors. Their bearing systems are only equipped with standard bearing seats and general bearings. The rotor does not have an axial limit structure, nor does it have an independent bearing cover. When the equipment is running, it relies on the excitation force of the motor to drive the screen body to complete the material screening operation.

[0003] The conventional vibratory motors described above have many shortcomings under long-term high-frequency vibration conditions: due to the lack of an effective axial locking and limiting structure for the bearings, the bearings are prone to axial movement under continuous excitation, which can lead to bearing seizure, bearing wear and damage, and other faults. The motor has a short service life, and the equipment requires frequent maintenance and a large amount of maintenance work. At the same time, the bearings are prone to excessive temperature rise and seizure, resulting in high manual maintenance costs and seriously affecting the continuity of production, making it difficult to meet the needs of continuous and large-scale production. In view of this, we propose a vibratory motor for vibrating screens with a bearing limiting structure. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings mentioned in the background section and provide a bearing-limiting structure type vibrating screen vibrating motor.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A bearing-limiting structure type vibrating screen vibrating motor includes a motor stator housing in which a motor rotor is rotatably mounted, and further includes: Two bearing housings are symmetrically and detachably installed at both ends of the motor stator base housing, and a shaft cavity is provided at the shaft center. A bearing cavity for embedding the bearing body is provided on one side of the shaft cavity. Two motor end caps are used to restrict the axial movement of the bearing body. They are detachably and symmetrically installed on the outside of the bearing housing, and have shaft holes at the center of the shaft. The motor rotor is provided with a gradient diameter shaft along the axial direction. The gradient diameter shaft is inserted into the shaft cavity, the bearing body and the shaft hole in sequence from the inside to the outside.

[0006] Preferably, the bearing housing includes a cover base and an embedded protrusion disposed at the inner end of the cover base; The motor stator base shell has mounting ring edge plates on the outer periphery of both ends, and a packaging card slot with an inner diameter larger than the inner diameter of the inner cavity is provided at the inner edge of the mounting ring edge plates. The cover base is embedded in the slot of the encapsulation card, and the embedded protrusion is embedded in the inner cavity.

[0007] Preferably, the inner diameter of the bearing cavity is larger than the inner diameter of the shaft cavity, and the bearing cavity is located near the side of the motor end cover; The bearing body is rotatably disposed within the bearing cavity, and axial movement is restricted by the bearing cavity.

[0008] Preferably, a shaft clip is installed on the gradient diameter shaft and at the outer end of the bearing body, the shaft clip being used to prevent the motor rotor from axially moving.

[0009] Preferably, the outer periphery of the cover base is provided with a fastening ring edge plate corresponding to the position of the mounting ring edge plate, and the fastening ring edge plate and the mounting ring edge plate are detachably connected by fastening bolts.

[0010] Preferably, the inner side of the motor end cover is provided with a press-fitting protrusion for insertion into the bearing cavity, and the press-fitting protrusion is used to press inward against the outer end face of the bearing seat to prevent movement. The outer diameter of the press-fitted convex ring is consistent with the inner diameter of the bearing cavity; The motor end cover is detachably mounted on the outer end of the bearing housing using sealing screws.

[0011] Preferably, a sealing cavity is provided at the center of the motor end cover and inside the shaft hole, and an oil seal is provided in the sealing cavity. The inner ring of the oil seal is sealed and installed on the gradient diameter shaft.

[0012] Preferably, the gradient diameter shaft has a diameter that decreases in a stepwise manner from the inside to the outside, and includes shaft segments that are adapted to the shaft cavity, the inner ring of the bearing body, the oil seal, or the shaft hole, respectively.

[0013] Preferably, the inner diameter of the shaft cavity is larger than the inner ring of the bearing body and smaller than the inner diameter of the outer ring of the bearing body, and an axial positioning step surface for positioning the bearing body is formed between the shaft cavity and the bearing cavity.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. The bearing-limiting structure type vibrating screen vibrating motor can solve the problems of frequent bearing seizure and bearing damage in the original motor, extend the motor maintenance cycle, significantly reduce the frequency of replacement and maintenance, and enable the production line to operate continuously and stably for a long time, which is conducive to increasing output. 2. This application has multiple protective structures, which can prevent the bearing body and motor rotor from shifting and wearing under high-frequency vibration, thus preventing vibration motor failure from the structural source. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the overall structural installation relationship of the present invention; Figure 2 This is a schematic diagram of the bearing housing structure of the present invention; Figure 3 This is a schematic diagram of the motor end cover structure of the present invention; Figure 4 This is a schematic diagram of the motor stator base shell of the present invention; Figure 5 This is a schematic diagram of the motor rotor of the present invention.

[0016] The meanings of the labels in the diagram are as follows: 1. Motor stator housing; 101. Inner cavity; 102. Encapsulation card slot; 11. Mounting ring edge plate; 2. Motor rotor; 21. Gradient diameter shaft; 3. Bearing housing; 31. Cover base; 33. Embedded protrusion plate; 32. Fastening ring edge plate; 301. Bearing cavity; 302. Shaft cavity; 4. Bearing body; 5. Motor end cover; 51. Press-fit protrusion ring; 501. Shaft hole; 502. Sealing cavity; 6. Oil seal; 7. Shaft clip; 8. Fastening bolt; 9. Encapsulation screw. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figures 1-5 The present invention will describe the above technical solution in detail through the following embodiments: This embodiment provides a bearing-limiting structure type vibrating screen vibrating motor, specifically including a motor stator base 1, a motor rotor 2, a bearing housing 3, a bearing body 4, a motor end cover 5, an oil seal 6, a shaft clip 7, fastening bolts 8, and sealing screws 9.

[0019] like Figure 1 , Figure 4As shown, the motor stator housing 1 in this embodiment is an integral cylindrical shell structure with an axially penetrating inner cavity 101. The inner cavity 101 is used to accommodate the motor rotor 2 and provide movement space for rotor rotation. The outer periphery of both ends of the motor stator housing 1 extends outward to form annular mounting ring plates 11. The mounting ring plates 11 are evenly provided with a plurality of bolt holes along the circumference for fastening connection with the bearing seat 3. At both ends of the motor stator housing 1 and at the inner edge of the mounting ring plates 11, there are inwardly recessed encapsulation slots 102. The inner diameter of the encapsulation slots 102 is larger than the inner diameter of the inner cavity 101, thereby forming a radial stepped surface between the encapsulation slots 102 and the inner cavity 101. This stepped surface is used for the mounting and positioning of the bearing seat 3, ensuring the coaxiality between the bearing seat 3 and the motor stator housing 1, and avoiding bearing wear due to assembly deviation.

[0020] like Figure 1 , Figure 5 As shown, the motor rotor 2 is provided with a gradient diameter shaft 21 along the axial direction. The diameter of the gradient diameter shaft 21 decreases in a stepwise manner from the inside to the outside, forming multiple shaft segments with different diameters. Specifically, the gradient diameter shaft 21 includes a first shaft segment, a second shaft segment, a third shaft segment, and an outermost connecting shaft segment arranged sequentially from the inside to the outside. The first shaft segment has the largest diameter and is used for rotational engagement with the shaft cavity 302 of the bearing housing 3. The second shaft segment has a smaller diameter and is used for interference fit with the inner ring of the bearing body 4. The third shaft segment has a smaller diameter and is used to pass through the shaft hole 501 of the motor end cover 5 and seal with the inner ring of the oil seal 6. The outermost end is connected to the external power source of the shaft end; the shaft segments are transitioned by radial stepped surfaces and can abut against the inner ring end face of the bearing body 4 to achieve axial positioning; the stepped structure design of the gradient diameter shaft 21 in this embodiment allows the rotor shaft to undertake different functions in different parts; the inner shaft segment undertakes the main radial support and rotational fit functions, the middle shaft segment undertakes the bearing installation and positioning functions, and the outer shaft segment undertakes the sealing and penetration functions. The diameter of each segment is set as needed, which not only ensures the structural strength and fit accuracy, but also avoids material waste and assembly interference caused by the whole shaft having the same diameter.

[0021] like Figure 2As shown, there are two bearing housings 3, which are symmetrically and detachably installed at both ends of the motor stator housing 1 in this embodiment. The bearing housing 3 has an overall ring-shaped structure with a flange, including a cover base 31 and an embedded protrusion 33 at the inner end of the cover base 31. The cover base 31 is the main body of the bearing housing 3, which is cylindrical and has a shaft cavity 302 formed axially through its axis. The shaft cavity 302 allows the gradient diameter shaft 21 to pass through and rotate with the first shaft segment. Inside the cover base 31 and on the side close to the motor end cover 5, a bearing cavity 301 is radially expanded outward. The inner diameter of the bearing cavity 301 is larger than that of the shaft. The inner diameter of cavity 302 forms an axial positioning step surface between bearing cavity 301 and shaft cavity 302. Bearing cavity 301 is used to install bearing body 4. The outer ring of bearing body 4 is installed in bearing cavity 301. The inner ring of bearing body 4 is interference-fitted with the second shaft section of gradient diameter shaft 21. The inner diameter of shaft cavity 302 is larger than the inner diameter of the inner ring of bearing body 4 and smaller than the inner diameter of the outer ring of bearing body 4, so that the axial positioning step surface just abuts against the end face of the outer ring of bearing body 4, axially limiting bearing body 4 from the inside and preventing bearing body 4 from moving inward under vibration.

[0022] It is important to note that, such as Figure 1 , Figure 2 and Figure 4 As shown, in this embodiment, the embedded protrusion 33 extends inward from the inner end face of the cover base 31, forming an annular protrusion structure. Its outer diameter is adapted to the inner diameter of the inner cavity 101 of the motor stator base shell 1. During assembly, the embedded protrusion 33 is fitted into the port of the inner cavity 101, forming a radial fit with the inner wall of the inner cavity 101, thereby ensuring the coaxiality between the bearing seat 3 and the motor stator base shell 1. The inner end face of the cover base 31 abuts against the bottom step surface of the encapsulation card slot 102, realizing the axial positioning of the bearing seat 3. The dual embedding and positioning structure of the embedded protrusion 33 and the encapsulation card slot 102 enables the bearing seat 3 to obtain precise positioning in both the radial and axial directions, effectively avoiding possible skewing and misalignment during assembly.

[0023] In this embodiment, a fastening ring plate 32 extends radially outward from the outer periphery of the cover base 31. The position of the fastening ring plate 32 corresponds to the mounting ring plate 11 on the motor stator base 1. Several bolt holes are evenly distributed circumferentially on the fastening ring plate 32. During assembly, the fastening ring plate 32 and the mounting ring plate 11 fit together, and the bearing seat 3 is fastened to the end of the motor stator base 1 by fastening bolts 8 passing through the bolt holes of both. In this embodiment, the fastening bolts 8 are evenly distributed circumferentially to ensure the reliability of the connection and the uniformity of the force. The bolt detachable connection method facilitates the disassembly and maintenance of the bearing seat 3. When it is necessary to replace the bearing or repair the internal structure, the bearing seat 3 can be removed as a whole simply by removing the fastening bolts 8, which is convenient.

[0024] In this embodiment, two bearing bodies 4 are provided, which are respectively embedded in the bearing cavities 301 of the two bearing seats 3. The bearing body 4 is a rolling bearing suitable for vibration conditions. Its outer ring forms an interference fit or transition fit with the inner wall of the bearing cavity 301, and its inner ring forms an interference fit with the second shaft section of the gradient diameter shaft 21. The inner end face of the bearing body 4 abuts against the bearing cavity 301, and is axially limited from the inside by the stepped surface therein. The outer end face of the bearing body 4 is axially pressed from the outside by the press-fitting protrusion 51 of the motor end cover 5, thereby realizing the bidirectional axial positioning of the bearing body 4 and effectively preventing the bearing from axially moving under high frequency vibration.

[0025] like Figure 1 , Figure 3 As shown, there are two motor end covers 5, which are detachably and symmetrically installed on the outside of the two bearing seats 3. The motor end cover 5 is generally disc-shaped, with a shaft hole 501 at its center, through which the third shaft section of the gradient diameter shaft 21 passes. The inner end face of the motor end cover 5 is provided with an inwardly extending press-fitting protrusion ring 51. The press-fitting protrusion ring 51 has an annular boss structure, and its outer diameter is consistent with the inner diameter of the bearing cavity 301. During assembly, the press-fitting protrusion ring 51 is inserted into the bearing cavity 301, and the inner end face of the press-fitting protrusion ring 51 presses against the outer ring end face of the bearing body 4, applying axial clamping force to the bearing body 4 from the outside. Together with the axial positioning step surface on the inside, the bearing body 4 is firmly clamped and fixed in the bearing cavity 301, completely eliminating the axial movement clearance of the bearing under vibration conditions. The insertion and fit between the press-fitting protrusion ring 51 and the bearing cavity 301 also plays a role in radial positioning, ensuring the coaxiality between the motor end cover 5 and the bearing seat 3.

[0026] like Figure 1 , Figure 3 As shown, in this embodiment, a sealing cavity 502 is provided axially inward at the axis of the motor end cover 5 and inside the shaft hole 501. The sealing cavity 502 is coaxially connected with the shaft hole 501. An oil seal 6 is provided inside the sealing cavity 502. The oil seal 6 is a lip seal, with its outer ring embedded and fixed on the inner wall of the sealing cavity 502, and its inner ring sealingly fitted on the third shaft section of the gradient diameter shaft 21, forming a dynamic sealing fit with the shaft surface. The oil seal 6 effectively prevents external dust and moisture from entering the motor, while also preventing internal grease leakage, ensuring a clean lubrication environment for the bearings and the inside of the motor, and extending the service life of the bearings.

[0027] In this embodiment, the motor end cover 5 is detachably mounted on the outer end face of the bearing housing 3 by means of encapsulation screws 9. The encapsulation screws 9 are evenly distributed along the circumference of the motor end cover 5, pass through the screw holes on the motor end cover 5 and are screwed into the corresponding threaded holes on the outer end face of the bearing housing 3 to achieve a tight connection between the motor end cover 5 and the bearing housing 3. The method of using encapsulation screws 9 to connect makes the disassembly and assembly of the motor end cover 5 very convenient. When it is necessary to replace the oil seal 6 or adjust the bearing preload, only the encapsulation screws 9 need to be removed to remove the motor end cover 5 without disassembling the entire bearing housing 3, which improves maintenance efficiency.

[0028] like Figure 1 As shown, in this embodiment, a shaft clip 7 is installed on the gradient diameter shaft 21 at the outer end of the bearing body 4. The shaft clip 7 is an elastic retaining ring, which is clipped into the shaft clip mounting groove opened at the corresponding position on the gradient diameter shaft 21. The outer diameter of the shaft clip 7 is larger than the inner diameter of the inner ring of the bearing body 4. The inner end face of the shaft clip 7 abuts against the end face of the inner ring of the bearing body 4, axially limiting the motor rotor 2 from the outside and preventing the motor rotor 2 from axially moving under vibration. The cooperation between the shaft clip 7 and the inner ring of the bearing body 4 realizes the axial positioning of the rotor relative to the bearing, ensuring the uniform air gap between the rotor and the stator, and avoiding faults such as rotor rubbing against the stator and bearing wear caused by rotor movement.

[0029] The assembly process of the bearing-limiting structure type vibrating screen vibrating motor of the present invention is as follows: First, two bearing bodies 4 are respectively press-fitted onto the second shaft sections at both ends of the gradient diameter shaft 21 of the motor rotor 2, so that the inner ring of the bearing is interference-fitted with the shaft section; then, the shaft clips 7 are respectively clipped into the shaft clip mounting slots at both ends of the gradient diameter shaft 21, so that the shaft clips 7 abut against the outer end face of the inner ring of the bearing, completing the pre-assembly of the rotor assembly; next, two bearing seats 3 are respectively fitted into the motor rotor 2 from both ends, so that the first shaft section of the gradient diameter shaft 21 passes through the shaft cavity 302, the outer ring of the bearing body 4 is embedded in the bearing cavity 301, and the inner end face of the bearing body 4 abuts against the axial positioning step surface between the bearing cavity 301 and the shaft cavity 302. At this time, the embedded protrusion 33 is located inside the bearing housing 3, facing the direction of the motor stator base 1; then, the motor rotor 2, which is equipped with the bearing housing 3 and the bearing body 4, is installed into the inner cavity 101 of the motor stator base 1, so that the embedded protrusion 33 of the bearing housing 3 at both ends are respectively embedded into the inner cavity 101 ports at both ends of the motor stator base 1, and the inner end face of the cover base 31 abuts against the bottom step surface of the encapsulation card slot 102; at the same time, the fastening ring edge plate 32 of the bearing housing 3 and the mounting ring edge plate 11 of the motor stator base 1 are fitted and aligned with each other; then, the fastening bolts 8 are inserted into the bolt holes on the fastening ring edge plate 32 and the mounting ring edge plate 11 in sequence and tightened to complete the fastening connection between the bearing housing 3 and the motor stator base 1.

[0030] Finally, the oil seals 6 are installed into the sealing cavities 502 of the two motor end covers 5 respectively, and then the two motor end covers 5 are installed on the outer sides of the bearing seats 3 at both ends respectively, so that the press-fitting convex rings 51 are inserted into the bearing cavity 301 and press against the outer ring end face of the bearing body 4. The third shaft section of the gradient diameter shaft 21 passes through the shaft hole 501 and seals with the inner ring of the oil seal 6. Then, the sealing screws 9 are screwed through the motor end cover 5 into the threaded hole of the bearing seat 3 and tightened to complete the installation of the motor end cover 5. At this point, the entire vibratory motor assembly is complete. After the motor is powered on, the motor rotor 2 rotates at high speed in the inner cavity 101 of the motor stator base 1, generating high-frequency excitation force, which drives the vibrating screen body to vibrate, realizing the material screening operation. Under continuous high-frequency vibration conditions, the bearing body 4 bears alternating radial loads and axial impact loads. This invention effectively solves the problem of bearing movement in the vibratory motor through the synergistic effect of multiple axial limiting structures.

[0031] Specifically, a multi-layered limiting structure is formed. The first layer of limiting is achieved by the axial positioning step surface inside the bearing housing 3 pressing against the outer ring end face of the bearing body 4 from the inside, restricting the bearing from moving inwards. The second layer of limiting is achieved by the press-fitting protrusion 51 of the motor end cover 5 pressing against the outer ring end face of the bearing body 4 from the outside, restricting the bearing from moving outwards. The combined action of the inner and outer layers firmly fixes the outer ring of the bearing body 4 within the bearing cavity 301, eliminating axial movement clearance of the bearing outer ring. The third layer of limiting is achieved by the shaft clip 7 on the gradient diameter shaft 21 abutting against the inner ring end face of the bearing body 4, restricting the axial movement of the motor rotor 2 relative to the bearing, ensuring the relative positional stability between the rotor and stator.

[0032] Through the synergistic protection of the above-mentioned triple axial limiting structure, there is no axial movement clearance between the outer ring of the bearing and the bearing housing 3, and between the inner ring of the bearing and the rotor shaft, which fundamentally eliminates faults such as bearing seizure and bearing wear caused by movement. At the same time, the radial fitting between the inner protrusion 33 of the bearing housing 3 and the inner cavity 101 of the motor stator base shell 1, as well as the positioning function of the encapsulation card slot 102, ensure the coaxiality between the bearing housing 3 and the stator base shell, and avoid bearing wear caused by assembly deviation.

[0033] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0034] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A bearing-limiting structure type vibrating screen vibrating motor, comprising a motor stator base shell (1) in which a motor rotor (2) is rotatably mounted in an inner cavity (101), characterized in that: Also includes: Two bearing housings (3) are symmetrically and detachably installed at both ends of the motor stator base shell (1), and a shaft cavity (302) is provided at the shaft center. A bearing cavity (301) for embedding the bearing body (4) is provided on one side of the shaft cavity (302). Two motor end caps (5) are used to restrict the bearing body (4) from moving axially. They are detachably and symmetrically installed on the outside of the bearing seat (3), and a shaft hole (501) is provided at the shaft center. The motor rotor (2) is provided with a gradient diameter shaft (21) along the axial direction. The gradient diameter shaft (21) is inserted into the shaft cavity (302), the bearing body (4) and the shaft hole (501) in sequence from the inside to the outside.

2. The bearing-limiting structure type vibrating screen vibrating motor as described in claim 1, characterized in that: The bearing housing (3) includes a cover base (31) and an embedded protrusion (33) disposed at the inner end of the cover base (31). The motor stator base shell (1) has mounting ring plates (11) on the outer periphery of both ends, and a packaging card slot (102) with an inner diameter larger than the inner diameter of the inner cavity (101) is provided at the inner edge of the mounting ring plate (11). The cover base (31) is fitted into the encapsulation card slot (102), and the embedded protrusion (33) is fitted into the inner cavity (101).

3. The bearing-limiting structure type vibrating screen vibrating motor as described in claim 2, characterized in that: The inner diameter of the bearing cavity (301) is larger than the inner diameter of the shaft cavity (302), and the bearing cavity (301) is located near the side of the motor end cover (5); The bearing body (4) is rotatably disposed in the bearing cavity (301), and axial movement is restricted by the shaft cavity (302).

4. The bearing-limiting structure type vibrating screen vibrating motor as described in claim 3, characterized in that: A shaft clip (7) is installed on the gradient diameter shaft (21) and at the outer end of the bearing body (4). The shaft clip (7) is used to restrict the motor rotor (2) from axial movement.

5. The bearing-limiting structure type vibrating screen vibrating motor as described in claim 2, characterized in that: The outer periphery of the cover base (31) is provided with a fastening ring edge plate (32) corresponding to the position of the mounting ring edge plate (11), and the fastening ring edge plate (32) and the mounting ring edge plate (11) are detachably connected by fastening bolts (8).

6. The bearing-limiting structure type vibrating screen vibrating motor as described in claim 3, characterized in that: The inner side of the motor end cover (5) is provided with a press-fitting protrusion (51) for insertion into the bearing cavity (301). The press-fitting protrusion (51) is used to press inward against the outer end face of the bearing seat (3) to prevent movement. The outer diameter of the press-fitted protruding ring (51) is consistent with the inner diameter of the bearing cavity (301); The motor end cover (5) is detachably installed at the outer end of the bearing seat (3) by means of a sealing screw (9).

7. The bearing-limiting structure type vibrating screen vibrating motor as described in claim 1, characterized in that: The motor end cover (5) is provided with a sealing cavity (502) at the center of the shaft and inside the shaft hole (501). An oil seal (6) is provided in the sealing cavity (502). The inner ring of the oil seal (6) is sealed and installed on the gradient diameter shaft (21).

8. The bearing-limiting structure type vibrating screen vibrating motor as described in claim 7, characterized in that: The gradient diameter shaft (21) has a stepped diameter that decreases from the inside to the outside, and includes shaft segments that are adapted to the shaft cavity (302), the inner ring of the bearing body (4), the oil seal (6), or the shaft hole (501).

9. The bearing-limiting structure type vibrating screen vibrating motor as described in claim 3, characterized in that: The inner diameter of the shaft cavity (302) is larger than the inner ring of the bearing body (4) and smaller than the inner diameter of the outer ring of the bearing body (4). An axial positioning step surface for positioning the bearing body (4) is formed between the shaft cavity (302) and the bearing cavity (301).

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