An eccentric sleeve oil film bearing drawing device

Abstract

The application relates to a eccentric sleeve oil film bearing drawing device, and relates to the technical field of bearing dismounting. In order to solve the problem that the existing drawing device is difficult to dismount, the device comprises a rotating screw rod and a fixing sleeve, the rotating screw rod penetrates through the fixing sleeve and is in threaded connection with the fixing sleeve, a plurality of sets of expansion mechanisms are arranged on the rotating screw rod, the expansion mechanisms comprise inner stretching inclined slide keys, outer stretching inclined slide keys, a drawing cutter seat and drawing cutter blades, the inner stretching inclined slide keys are fixedly connected to the rotating screw rod, the outer stretching inclined slide keys are in inclined surface matching with the inner stretching inclined slide keys, the drawing cutter seat is fixedly connected to the outer stretching inclined slide keys, the drawing cutter blades are arranged on the drawing cutter seat, and the drawing cutter blades are driven to move in the radial direction by rotating the rotating screw rod. The application ensures the integrity of the bearing after dismounting, realizes safe, lossless and efficient dismounting of the oil film bearing, and has the effect of adapting to the dismounting requirements of bearings of different specifications.

Description

Technical Field

[0001] This application relates to the field of bearing assembly and disassembly technology, and in particular to a device for pulling out an eccentric sleeve oil film bearing. Background Technology

[0002] In metallurgical rolling mill equipment, the roller box is a core transmission component, and its stable operation is crucial. During the regular maintenance of the roller box, the inspection and replacement of the oil film bearing installed in the eccentric sleeve is a routine but highly technical operation; for a long time, the pull-out method has been commonly used on site to remove the bearing.

[0003] However, in practical applications, due to differences in the design concepts and process details of the eccentric sleeve and oil film bearing mating structure among different equipment manufacturers, the positioning structure on the eccentric sleeve used to fix the oil film bearing is diverse, which brings severe challenges to bearing removal. Especially when encountering specially designed bearing positioning structures, such as the flange structure used for precise axial positioning whose dimensions exceed the outer edge of the bearing inner ring, although this design can effectively prevent axial movement and ensure transmission accuracy during equipment assembly, it becomes an insurmountable structural interference barrier during the maintenance cycle.

[0004] In related technologies, when using conventional bearing pullers, commonly known as pullers, for disassembly, the puller's claws need to firmly grip the bearing's inner ring's end face or outer cylindrical surface, which is specifically designed for bearing stress, to apply a smooth axial pulling force. However, at this moment, the high-protruding positioning edge acts like a wall, completely blocking the path of the claws to reach down and grip. The claws either cannot effectively reach the bearing's stress-bearing part or can only make contact with a very unstable tilt angle, making it impossible to form a reliable and centered clamping. This causes the traditional radial force-applying puller to fail. Forced operation not only leads to disassembly failure but may also cause irreversible damage to the eccentric sleeve positioning surface, affecting the long-term operational stability of the equipment. At the same time, there are safety risks of tool damage and personnel injury, so improvements are needed. Utility Model Content

[0005] To address the problem of difficult disassembly of existing pullers, this application provides an eccentric sleeve oil film bearing puller.

[0006] The eccentric sleeve oil film bearing pull-out device provided in this application adopts the following technical solution: An eccentric sleeve oil film bearing pulling device includes a rotating screw and a fixed sleeve. The rotating screw passes through the fixed sleeve and is threadedly connected to it. Multiple expansion mechanisms are provided on the rotating screw. Each expansion mechanism includes an inner tensioning oblique key, an outer tensioning oblique key, a pulling tool holder, and a pulling blade. The inner tensioning oblique key is fixedly connected to the rotating screw. The outer tensioning oblique key engages with the inclined surface of the inner tensioning oblique key. The pulling tool holder is fixedly connected to the outer tensioning oblique key. The pulling blade is arranged on the pulling tool holder. Rotating the rotating screw drives the pulling blade to move radially.

[0007] By adopting the above technical solution, including a rotating screw and a fixed sleeve, the rotating screw is rotatably mounted on the fixed sleeve, and multiple sets of expansion mechanisms are mounted on the rotating screw. The expansion mechanism includes an inner tensioning oblique slide key, an outer tensioning oblique slide key, a pull-out knife holder, and a pull-out blade. When disassembling an oil film bearing, first measure the diameter of the eccentric sleeve positioning flange and the inner ring diameter of the oil film bearing. Based on the measurement data, select a replaceable puller blade of the appropriate specification and install it on the puller holder. Adjust the opening of the puller device so that the outer edge of the blade is between the measured diameter of the eccentric sleeve positioning flange and the inner ring diameter of the oil film bearing. Insert the puller device into the eccentric sleeve until the puller blade reaches the gap between the inner ring end face of the bearing and the positioning flange. Rotate the handle at the end of the screw to drive the inner tensioning oblique slide key to move axially. The oblique surface engagement causes the outer tensioning oblique slide key to drive the puller holder to expand radially until the puller blade is inserted into the gap to the designed depth. At this time, pull the handle in the opposite direction. The blade applies a uniform axial force to the bearing. With the push action on the other side, safe and non-destructive disassembly can be achieved in a limited space. With its simple overall structure, incorporating a rotating screw, fixed sleeve, and expansion mechanism, the bearing is pulled out as a whole during removal, ensuring its integrity. By pushing from the other side of the bearing in reverse, a safe, uniform, and powerful axial force is created within a limited and irregular space, enabling safe, non-destructive, and efficient disassembly of oil film bearings. This effectively protects the oil film bearing and its mounting surface, preventing scratches or deformation during disassembly, ensuring the quality of subsequent installation, and extending the equipment's service life. Furthermore, the device can be easily adapted to disassembly requirements of bearings of different specifications through convenient blade replacement, enhancing its versatility and applicability. The entire disassembly process is stable and reliable, avoiding damage to the shaft and surrounding components.

[0008] Optionally, the expansion mechanism further includes a smooth key, and the fixed sleeve has a smooth keyway. One end of the smooth key is connected to the drawing tool holder, and the other end of the smooth key is slidably connected in the smooth keyway.

[0009] By adopting the above technical solution, the expansion mechanism also includes a smooth key, and a smooth keyway is opened on the fixed sleeve; by setting the smooth key and smooth keyway, the movement trajectory of the drawing tool holder during the radial expansion process is effectively limited, ensuring that it always moves smoothly along the preset direction, and avoiding jamming or shaking caused by force deviation.

[0010] Optionally, a beveled bolt for connection is provided between the inner tensioning oblique slide key and the rotating screw.

[0011] By adopting the above technical solution, the internal tensioning oblique slide key is connected to the rotating screw through the oblique bolt. The oblique bolt is used to ensure a stable connection between the bolt and the rotating screw, effectively avoiding loosening or displacement that may occur during operation. At the same time, it is easy to disassemble and assemble, improving maintenance efficiency.

[0012] Optionally, a fixing bolt for connection is provided between the smooth key and the puller holder.

[0013] By adopting the above technical solution, the smooth key is connected to the puller holder through a fixing bolt; the setting of the fixing bolt ensures a reliable connection, ensuring the stability of the smooth key and the puller holder under complex stress conditions, and effectively preventing the connection from loosening due to vibration or impact during operation.

[0014] Optionally, a connecting bolt is provided between the external tensioning oblique slide key and the pull-out tool holder for connection.

[0015] By adopting the above technical solution, the external tensioning oblique slide key is connected to the drawing tool holder through connecting bolts; the setting of connecting bolts ensures the reliability of the connection between the external tensioning oblique slide key and the drawing tool holder, and avoids the risk of connection failure due to deformation under stress during operation.

[0016] Optionally, the pull blade is a replaceable structure, and the pull blade holder is detachably mounted on the pull blade holder.

[0017] By adopting the above technical solution, the puller blade has a replaceable structure; the detachable puller blade can quickly adapt to the disassembly requirements of bearings of different specifications. Only the blade of the corresponding size needs to be replaced to complete the operation under different working conditions, which shortens the maintenance time and improves the versatility of the device.

[0018] Optionally, the number of expansion mechanisms is three sets, and the three sets of expansion mechanisms are evenly arranged along the circumference of the rotating screw.

[0019] By adopting the above technical solution, the number of expansion mechanisms is three. By setting the number of expansion mechanisms, the pulling device can form a balanced radial force during operation, effectively avoiding the problem of bearing overload or local stress concentration on the positioning surface that may be caused by single-point force application, ensuring stable bearing disassembly and improving the safety of operation.

[0020] Optionally, the end of the rotating screw is provided with a handle for lifting.

[0021] By adopting the above technical solution, the handrail is installed on the rotating screw; the handrail provides the operator with a manual force application point, enabling them to control the rotation of the rotating screw through the handrail, effectively improving the operating comfort.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. With its simple overall structure consisting of a rotating screw, fixed sleeve, and expansion mechanism, the bearing is pulled out as a whole during removal, ensuring its integrity after disassembly. By pushing from the other side of the bearing in reverse, a safe, uniform, and powerful axial force is generated for the bearing in a limited and irregular space, enabling safe, non-destructive, and efficient disassembly of the oil film bearing. This effectively protects the oil film bearing and its mounting surface, preventing scratches or deformation during disassembly, ensuring the quality of subsequent installation, and extending the service life of the equipment. Furthermore, the device can be easily adapted to the disassembly needs of bearings of different specifications by replacing the blades, improving its versatility and applicability. The entire disassembly process is stable and reliable, avoiding damage to the shaft and surrounding components. 2. By setting smooth keys and smooth keyways, the movement trajectory of the drawing tool holder during the radial expansion process is effectively limited, ensuring that it always moves smoothly along the preset direction, avoiding jamming or shaking caused by force deviation. 3. The removable design of the pull-out blade allows for quick adaptation to the disassembly requirements of bearings of different specifications. Simply replacing the blade with the corresponding size is sufficient to complete operations under different working conditions, shortening maintenance time and improving the versatility of the device. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of an eccentric sleeve oil film bearing pull-out device in an embodiment of this application.

[0024] Figure 2 This is a bottom view of an eccentric sleeve oil film bearing pull-out device according to an embodiment of this application.

[0025] Figure 3 This is a schematic diagram of an eccentric sleeve oil film bearing pull-out device according to an embodiment of this application.

[0026] Figure 4This is a schematic diagram of the shrinkage of an eccentric sleeve oil film bearing pull-out device in an embodiment of this application.

[0027] Figure 5 This is a schematic diagram illustrating the pulling of the inner oil film bearing of the eccentric sleeve in the embodiments of this application.

[0028] Explanation of reference numerals in the attached diagram: 1. Rotating screw; 2. Fixed sleeve; 3. Inner tension sliding key; 4. Outer tension sliding key; 5. Pulling tool holder; 6. Pulling blade; 7. Smoothing key; 8. Fixing bolt; 9. Connecting bolt; 10. Handrail. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0030] This application discloses a pull-out device for an eccentric sleeve oil film bearing. (Refer to...) Figure 1 The eccentric sleeve oil film bearing pulling device includes a rotating screw 1 and a fixed sleeve 2. The rotating screw 1 passes through the fixed sleeve 2 and is threadedly connected to the fixed sleeve 2. In this embodiment, the length of the rotating screw 1 is greater than the length of the fixed sleeve 2. At the same time, a handle 10 is installed at the end of the rotating screw 1. The handle 10 provides the operator with a manual force application point, so that the operator can control the rotation of the rotating screw 1 through the handle 10.

[0031] Reference Figure 1 and Figure 2 Multiple sets of expansion mechanisms are installed on the rotating screw 1. These expansion mechanisms are evenly arranged around the circumference of the rotating screw 1. In this embodiment, three sets of expansion mechanisms are preferred, so that the pulling device can form a balanced radial force during operation. This effectively avoids the problem of bearing overload or local stress concentration on the positioning surface that may be caused by single-point force application, ensuring stable bearing disassembly and improving the safety of operation.

[0032] Reference Figure 1 and Figure 2 The expansion mechanism includes a smooth key 7, an inner tensioning oblique key 3, an outer tensioning oblique key 4, a pull-out knife holder 5, and a pull-out blade 6. The inner tensioning oblique key 3 is fixedly installed on the rotating screw 1. In this embodiment, an oblique bolt is installed between the inner tensioning oblique key 3 and the rotating screw 1. The bolt provides a stable connection, ensuring that the inner tensioning oblique key 3 and the rotating screw 1 are reliably fixed, effectively avoiding loosening or displacement that may occur during operation. It is also easy to disassemble and assemble, improving maintenance efficiency.

[0033] Reference Figure 1 and Figure 3The outer stretching oblique slide key 4 and the inner stretching oblique slide key 3 are engaged on their inclined surfaces. Specifically, the inclined surfaces of the outer stretching oblique slide key 4 and the inner stretching oblique slide key 3 are fitted together at a specific angle, and an anti-disengagement structure, such as mutually fitting protrusions and grooves, is provided at the inclined surface engagement point to prevent accidental separation during relative sliding, thus ensuring the stability of the engagement. The pull-out knife holder 5 is fixedly connected to the outer stretching oblique slide key 4. In this embodiment, a connecting bolt 9 is installed between the outer stretching oblique slide key 4 and the pull-out knife holder 5, ensuring the reliability of the connection between the outer stretching oblique slide key 4 and the pull-out knife holder 5 and avoiding the risk of connection failure due to deformation under stress during operation.

[0034] Reference Figure 1 and Figure 4 The drawing blade 6 is arranged on the drawing blade holder 5. In this embodiment, the drawing blade 6 is a replaceable structure. The drawing blade holder 5 can be detachably installed on the drawing blade holder 5. By rotating the rotating screw 1, the drawing device blade is inserted into the tiny gap between the bearing inner ring end face and the retaining edge to a certain depth. It can quickly adapt to the disassembly requirements of bearings of different specifications. Only the corresponding size blade needs to be replaced to complete the operation under different working conditions, shortening the maintenance time and improving the versatility of the device.

[0035] Reference Figure 1 and Figure 5 The fixed sleeve 2 is provided with a smooth keyway. One end of the smooth key 7 is connected to the puller holder 5, and the other end of the smooth key 7 is slidably connected in the smooth keyway. In this embodiment, a fixing bolt 8 is installed between the smooth key 7 and the puller holder 5 to achieve a reliable connection and ensure the stability of the smooth key 7 and the puller holder 5 under complex stress conditions, effectively preventing the connection from loosening due to vibration or impact during operation.

[0036] The implementation principle of the eccentric sleeve oil film bearing pull-out device in this application embodiment is as follows: When disassembling the oil film bearing, first measure the diameter of the eccentric sleeve positioning flange and the diameter of the inner ring of the oil film bearing to be disassembled. Select the corresponding specification of replaceable pull-out blade 6 according to the measurement data and install it on the pull-out tool holder 5. Adjust the opening of the pull-out device so that the outer edge of the blade is between the measured diameter of the eccentric sleeve oil film bearing positioning flange and the diameter of the inner ring of the oil film bearing. Insert the pull-out device into the eccentric sleeve until the pull-out blade 6 reaches the gap between the end face of the bearing inner ring and the positioning flange. Rotate the end handle 10 of the screw 1 to drive the inner tensioning oblique slide key 3 to move axially. The oblique surface cooperation causes the outer tensioning oblique slide key 4 to drive the pull-out tool holder 5 to expand radially until the pull-out blade 6 is inserted into the gap to the designed depth. At this time, pull the handle 10 in the opposite direction. The blade applies a uniform axial force to the bearing. With the push action on the other side, safe and non-destructive disassembly is achieved in a limited space. With its simple overall structure consisting of a rotating screw 1, a fixed sleeve 2, and an expansion mechanism, the bearing is removed as a whole by pulling it out, ensuring its integrity after removal. By pushing from the other side of the bearing in reverse, a safe, uniform, and powerful axial force is created for the bearing in a limited and irregular space, enabling safe, non-destructive, and efficient disassembly of the oil film bearing. This effectively protects the oil film bearing and its mounting surface, preventing scratches or deformation during disassembly, ensuring the quality of subsequent installation, and extending the service life of the equipment. Furthermore, the device can be easily adapted to the disassembly needs of bearings of different specifications by conveniently replacing the blades, improving its versatility and applicability. The entire disassembly process is stable and reliable, avoiding damage to the shaft and surrounding components.

[0037] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for pulling out an eccentric sleeve oil film bearing, characterized in that: The device includes a rotating screw and a fixed sleeve. The rotating screw passes through the fixed sleeve and is threadedly connected to it. The rotating screw is equipped with multiple expansion mechanisms, each of which includes an inner tensioning oblique key, an outer tensioning oblique key, a pull-out blade holder, and a pull-out blade. The inner tensioning oblique key is fixedly connected to the rotating screw, and the outer tensioning oblique key engages with the inclined surface of the inner tensioning oblique key. The pull-out blade holder is fixedly connected to the outer tensioning oblique key, and the pull-out blade is arranged on the pull-out blade holder. By rotating the rotating screw, the pull-out blade is driven to move radially.

2. The eccentric sleeve oil film bearing pull-out device according to claim 1, characterized in that: The expansion mechanism also includes a smooth key, and a smooth keyway is provided on the fixed sleeve. One end of the smooth key is connected to the drawing tool holder, and the other end of the smooth key is slidably connected in the smooth keyway.

3. The eccentric sleeve oil film bearing pull-out device according to claim 1, characterized in that: An inclined bolt for connection is provided between the internal tensioning oblique slide key and the rotating screw.

4. The eccentric sleeve oil film bearing pull-out device according to claim 2, characterized in that: A fixing bolt is provided between the smooth key and the puller holder for connection.

5. The eccentric sleeve oil film bearing pull-out device according to claim 1, characterized in that: A connecting bolt is provided between the external tensioning oblique slide key and the drawing tool holder for connection.

6. The eccentric sleeve oil film bearing pull-out device according to claim 1, characterized in that: The drawing blade is replaceable, and the drawing blade holder is detachably mounted on the drawing blade holder.

7. The eccentric sleeve oil film bearing pull-out device according to claim 1, characterized in that: The expansion mechanism consists of three sets, which are evenly arranged along the circumference of the rotating screw.

8. The eccentric sleeve oil film bearing pull-out device according to claim 1, characterized in that: The end of the rotating screw is provided with a handle for lifting.

Images