Four-grip extrusion type bearing outer ring non-destructive uniform push-in installation tool and assembling method

Abstract

This invention relates to a four-grip, compression-type bearing outer ring non-destructive and uniform push-in installation tool and assembly method. It includes a central load-bearing base, four sets of radially adjustable grippers evenly arranged circumferentially, a synchronous adjustment and locking mechanism, a striking force-bearing top platform, and a non-metallic anti-damage buffer layer. The four sets of radially adjustable grippers are evenly distributed along the circumference of the central load-bearing base at 90° intervals. The four sets of radially adjustable grippers can synchronously expand and contract radially. Each set of radially adjustable grippers has an arc-shaped contact surface at its outer end, on which a non-metallic anti-damage buffer layer is fixedly installed. The striking force-bearing top platform is integrally located at the top of the central load-bearing base. The central load-bearing base contains a synchronous adjustment and locking mechanism for driving the synchronous opening and closing of the four sets of radially adjustable grippers. This invention has a simple and reasonable overall structure, is practical and convenient, and effectively solves the problems of traditional striking methods that easily damage the cage, cause force misalignment, damage to the workpiece, and have poor versatility.

Description

Technical Field

[0001] This invention belongs to the technical field of mechanical equipment bearing assembly and maintenance tooling, specifically involving a four-grip extrusion bearing outer ring non-destructive uniform pushing and installation tool and assembly method, which is applicable to the non-destructive assembly, pressing, and pushing into place of various rolling bearing outer rings in power generation, mining, water pumps, fans, and motors. Background Technology

[0002] When replacing bearings during on-site equipment maintenance, traditional bearing installation methods often involve directly striking the bearing outer ring with a copper rod or hammer, or using simple sleeves or single-jaw tools to assist in the assembly. However, this approach has several drawbacks in practice, including: 1) The striking position is difficult to control precisely, and it is easy to accidentally strike the bearing cage during the process, causing cage deformation and roller misalignment, leading to premature bearing failure and significantly increasing equipment maintenance costs; 2) Traditional tooling often applies force at single or two points, resulting in uneven force distribution and potential misalignment of the bearing outer ring, leading to jamming or misalignment during assembly. 1) Damage to bearing coaxiality and interference fit accuracy; 2) Direct hard contact between metal tools and bearing outer ring and bearing housing can easily cause indentations, scratches and impact damage on mating surfaces, reducing bearing assembly accuracy and shortening the overall service life of equipment; 3) Traditional tooling has fixed structural specifications, and a single tooling can only be used for a single type of bearing. For multi-specification bearing assembly scenarios, multiple sets of tooling equipment are required, resulting in high equipment procurement costs, cumbersome storage and management, and low work efficiency; 4) Manual direct hammering operations are prone to loss of force control, flying debris and other situations, posing significant personal safety hazards.

[0003] To address this issue, a four-grip extrusion bearing outer ring non-destructive and uniform push-in installation tool and assembly method were designed to overcome the aforementioned problems. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a simple and reasonable four-grip compression bearing outer ring non-destructive uniform push-in installation tool and assembly method that is universally applicable to multiple specifications, reusable, provides uniform impact force, is easy to operate, and is safe and hazard-free. This invention can effectively achieve uniform force application at four circumferential points, universal assembly of bearings of multiple specifications, and, combined with a flexible protective structure, achieve non-destructive assembly. Furthermore, the tooling as a whole can be reused for a long period.

[0005] This invention is achieved through the following technical solution: a four-grip compression bearing outer ring non-destructive and uniform push-in installation tool, comprising a central force-bearing base, four sets of radially adjustable grippers evenly arranged circumferentially, a synchronous adjustment and locking mechanism, a striking force-bearing top platform, and a non-metallic anti-damage buffer layer. The four sets of radially adjustable grippers are evenly distributed along the circumference of the central force-bearing base at 90°, and the four sets of radially adjustable grippers can synchronously achieve radial extension and retraction. Each set of radially adjustable grippers has an arc-shaped contact surface at its outer end. A non-metallic anti-damage buffer pad is fixedly installed on the arc-shaped contact surface; the impact force-bearing top platform is integrally set at the top of the central force-bearing base, and a synchronous adjustment and locking mechanism is installed inside the central force-bearing base to drive the four sets of radially adjustable claws to open and close synchronously; when external pressure is applied to the impact force-bearing top platform, the load is evenly transmitted to the four sets of radially adjustable claws through the central force-bearing base, so that the four sets of radially adjustable claws only adhere to the outer ring end face of the bearing to push it in, and do not contact the bearing cage and rollers throughout the process.

[0006] Preferably, the synchronous adjustment locking mechanism is a central screw-screw linkage structure. By rotating and adjusting the screw cap, the central screw and linkage can be linked to drive the four sets of radially adjustable claws to open outward or close inward synchronously, so as to realize stepless adjustment of the opening degree and adapt to the assembly of bearing outer rings of various outer diameter specifications.

[0007] Preferably, the adjusting cap is exposed at the center of the impact-receiving platform, the central screw is vertically mounted at the center of the central force-receiving base, and one end of the four sets of connecting rods is hinged to the central screw, and the other end is correspondingly hinged to each set of radially adjustable claws, forming a circumferential linkage telescopic structure to realize the synchronous opening and closing action of the four sets of radially adjustable claws.

[0008] Preferably, the central force-bearing base is a disc-shaped structure. The disc of the central force-bearing base has four radial grooves that correspond one-to-one with the radially adjustable claws. The four radial grooves are evenly distributed along the circumference of the central force-bearing base at 90°. The four sets of radially adjustable claws are respectively embedded in the corresponding radial grooves and can slide linearly along the radial grooves. The radial adjustment is completed in conjunction with the screw and connecting rod linkage structure.

[0009] As a preferred embodiment, the four sets of radially adjustable grippers are equipped with a radial stroke limiting structure. The radial stroke limiting structure matches the extension and retraction stroke setting of the lead screw linkage structure. The extreme position of the gripper's radial retraction does not intrude into the bearing cage area. Through physical structural isolation, it is used to prevent accidental damage to the bearing cage during force application, thereby eliminating bearing damage and operational safety hazards.

[0010] As a preferred embodiment, the end face of the central force-bearing base is engraved with specification scale markings, which correspond one-to-one with the outer diameter specifications of different bearings. This allows for quick alignment and matching of bearing specifications with the synchronous adjustment and locking mechanism, reducing repeated trial and adjustment operations and improving assembly efficiency.

[0011] Preferably, the impact-receiving platform is a convex circular structure to ensure that the force is not eccentric and to avoid skewing or jamming during hammering or press operation.

[0012] Preferably, the non-metallic anti-damage buffer pad is made of polyurethane or polytetrafluoroethylene and is attached to the outer ring contact surface of the bearing to avoid scratches and impact damage to the bearing outer ring and bearing housing mating surface caused by hard metal contact, thereby achieving non-destructive assembly of the bearing.

[0013] An assembly method for a four-grip extrusion bearing outer ring non-destructive and uniform push-in installation tool includes the following steps: S1. Selection and alignment: Based on the outer diameter of the outer ring of the bearing to be installed, refer to the scale markings on the center force base, rotate the center adjustment cap, and adjust the opening of the four sets of radially adjustable claws so that the claw opening is slightly larger than the outer diameter of the bearing outer ring. S2. Fitting and positioning: Align the four sets of radially adjustable claws with the upper outer edge of the bearing outer ring, and finely adjust the adjusting cap to make the non-metallic anti-damage buffer pad layer on the arc-shaped contact surface of the claws evenly and tightly adhere to the outer edge of the bearing outer ring. S3. Safety Confirmation: Check the inner clearance of the four sets of radially adjustable grippers to ensure that the grippers and pads do not touch or squeeze the bearing cage and rollers, and confirm that the assembly clearance is qualified. S4. Apply force evenly: straighten the tool to keep it vertical, and use a copper hammer or wooden hammer to strike the top of the platform evenly from light to heavy, or use a press to slowly and evenly apply force. S5. Removal: After the outer ring of the bearing is smoothly pushed into the set assembly position of the bearing housing, stop applying force; rotate the adjusting cap in the opposite direction to retract the four sets of radially adjustable claws, and complete the tool removal.

[0014] The beneficial effects of this invention are as follows: 1) Prevent bearing damage: Structural limiting + four-point pressure only on the outer ring, completely avoiding contact with the cage and rollers, thus preventing deformation, breakage and premature damage from the source; 2) Even and unbiased force application: The force is applied synchronously at four points around the circumference, the striking force is evenly distributed, the bearing is pushed in vertically and smoothly, without skewing or jamming, ensuring the coaxiality and interference fit quality of the assembly. 3) Versatile for multiple specifications: The four-grip synchronous stepless adjustment covers the outer diameter of commonly used large, medium and small bearings. One set of tools can replace multiple sets of special tooling, saving costs and facilitating on-site management. 4) Non-destructive protection: The contact surface is made of a special non-metallic buffer material, which will not scratch the outer ring of the bearing or bump the bearing housing bore, thus protecting the precision mating surfaces; 5) Safe and convenient: The whole enclosure is designed for stress distribution, eliminating the risk of splashing or localized collapse. It can be operated by a single person, and the adjustment is simple and the alignment is quick. 6) Durable and recyclable: The main body is forged from high-strength alloy steel, which is impact-resistant, non-deformable, and wear-resistant. It can be repeatedly used for many years and has a long service life. Attached Figure Description

[0015] Figure 1 This is a top view of the overall structure of the tool of the present invention; Figure 2 This is a side view of the overall structure of the tool of the present invention; Figure 3 This is a longitudinal center sectional view of the tool of the present invention; Figure 4 This is a three-dimensional structural diagram of the tool and bearing assembly of the present invention; Figure 5 This is a schematic diagram of the synchronous adjustment mechanism. Detailed Implementation

[0016] To enable those skilled in the art to more clearly understand the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0017] In the description of this invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "lateral", and "vertical" is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing this invention, and is not intended to indicate or imply that the device or component referred to must have a specific orientation, and therefore should not be construed as a limitation of this invention.

[0018] The invention will now be described in detail with reference to the accompanying drawings: Figure 1-3 As shown, a four-grip compression bearing outer ring non-destructive and uniform push-in installation tool includes a central force-bearing base 1, four sets of radially adjustable grippers 2 evenly arranged circumferentially, a synchronous adjustment and locking mechanism 3, a striking force-bearing top platform 4, and a non-metallic anti-damage buffer layer 5. The four sets of radially adjustable grippers 2 are evenly distributed along the circumference of the central force-bearing base 1 at 90°. The four sets of radially adjustable grippers 2 can synchronously achieve radial extension and retraction. An arc-shaped contact surface is provided at the outer end of each set of radially adjustable grippers 2, and the arc-shaped contact surface is fixed. A non-metallic anti-damage buffer pad 5 is fixedly installed; the impact-receiving top platform 4 is integrally set on the top of the central force-receiving base 1, and the central force-receiving base 1 is equipped with a synchronous adjustment locking mechanism 3, which is used to drive four sets of radially adjustable claws 2 to open and close synchronously; when external pressure is applied to the impact-receiving top platform 4, the load is evenly transmitted to the four sets of radially adjustable claws 2 through the central force-receiving base 1, so that the four sets of radially adjustable claws 2 only adhere to the outer ring end face of the bearing to push in, and do not contact the bearing cage and rollers throughout the process.

[0019] The synchronous adjustment locking mechanism 3 is a central screw-screw linkage structure. By rotating and adjusting the screw cap, the central screw and linkage can be linked to drive the four sets of radially adjustable claws 2 to open outward or close inward synchronously, so as to realize stepless adjustment of the opening degree and adapt to the assembly operation of bearing outer rings of various outer diameter specifications.

[0020] The adjustable screw cap is exposed at the center of the impact-receiving platform 4. The central screw is vertically mounted at the center of the central force-receiving base 1. One end of the four sets of connecting rods is hinged to the central screw, and the other end is correspondingly hinged to each set of radially adjustable claws 2, forming a circumferential linkage telescopic structure to realize the synchronous opening and closing action of the four sets of radially adjustable claws 2.

[0021] The central force-bearing base 1 is a disc-shaped structure. Four radial grooves corresponding to the radially adjustable claws 2 are opened on the disc body of the central force-bearing base 1. The four radial grooves are evenly distributed along the circumference of the central force-bearing base 1 at 90°. The four sets of radially adjustable claws 2 are respectively embedded in the corresponding radial grooves and can slide linearly along the radial grooves. The radial adjustment is completed in conjunction with the screw and connecting rod linkage structure.

[0022] The four sets of radially adjustable grippers 2 are equipped with a radial stroke limiting structure. The radial stroke limiting structure matches the extension stroke setting of the lead screw linkage structure. The extreme position of the gripper's radial retraction does not intrude into the bearing cage area. Through physical structural isolation, it is used to prevent accidental damage to the bearing cage during the application of force, and eliminate bearing damage and operational safety hazards.

[0023] The end face of the central force-bearing base 1 is engraved with specification scale markings (not shown in the figure). The scale markings correspond one-to-one with the outer diameter specifications of different bearings. They can be used in conjunction with the synchronous adjustment locking mechanism 3 to quickly align and match the bearing specifications, reduce repeated trial and adjustment operations, and improve assembly efficiency.

[0024] The impact-receiving top platform 4 is a convex circular structure to ensure that the force is not eccentric and to avoid skewing or jamming during hammering or press operation.

[0025] The non-metallic anti-damage buffer layer 5 is made of polyurethane or polytetrafluoroethylene and is attached to the outer ring contact surface of the bearing to avoid scratches and impact damage to the bearing outer ring and bearing housing mating surface caused by hard metal contact, so as to achieve non-destructive assembly of the bearing.

[0026] like Figure 4-5 As shown, an assembly method for a four-grip extrusion bearing outer ring non-destructive and uniform push-in installation tool includes the following steps: S1. Selection and alignment: Based on the outer diameter of the outer ring of the bearing to be installed, refer to the scale markings on the center force base 1, rotate the center adjustment cap, and adjust the opening of the four sets of radially adjustable claws 2 so that the claw opening is slightly larger than the outer diameter of the bearing outer ring. S2, Fitting and positioning: Align the four sets of radially adjustable claws 2 with the outer edge of the upper end of the bearing outer ring, and finely adjust the adjusting cap so that the non-metallic anti-damage buffer pad 5 on the arc-shaped contact surface of the claws is evenly and tightly attached to the outer edge of the bearing outer ring. S3. Safety Confirmation: Check the inner clearance of the four sets of radially adjustable grippers 2 to ensure that the grippers and pads do not touch or squeeze the bearing cage and rollers, and confirm that the assembly clearance is qualified. S4. Apply force evenly: straighten the tool to keep it vertical, and use a copper hammer or wooden hammer to strike the top platform 4 evenly from light to heavy, or use a press to slowly and evenly apply force. S5. Removal: After the outer ring of the bearing is smoothly pushed into the set assembly position of the bearing housing, stop applying force; rotate the adjusting cap in the opposite direction to close the four sets of radially adjustable claws 2, and complete the tool removal.

[0027] This invention relates to a four-grip compression bearing outer ring non-destructive and uniform push-in installation tool, used for power plant motor bearing installation. It can effectively achieve: pushing only the bearing outer ring without touching the cage; uniform force distribution at four circumferential points; adjustable and universal for multiple specifications; special soft contact material that does not damage the bearing and housing; simple operation, safety and reliability, and reusability.

[0028] The installation and maintenance precautions for this invention are as follows: 1) During assembly operations, it is strictly forbidden to use a hammer to strike the work. Only a copper hammer or wooden hammer may be used to gently tap or to apply pressure slowly and evenly with a press to avoid excessive impact load that could cause tool deformation, damage, or bearing damage. 2) Before each use, the radially adjustable gripper and the non-metallic anti-damage buffer pad should be checked for overall condition. If there are defects such as cracks, peeling, or deformation, the parts should be replaced in time. Tools with defects are prohibited from being used. 3) When adjusting the tool opening, the four sets of grippers must be opened and closed synchronously by adjusting the screw cap. It is forbidden to forcibly pry open a single gripper to avoid deformation of the internal screw and connecting rod structure and transmission failure. 4) During assembly, it is forbidden to apply force by pressing the radially adjustable claw against the bearing cage or roller position, so as to prevent damage to the bearing structure caused by improper operation; 5) After using the tools, wipe off the surface stains and apply anti-rust oil. Store them flat to avoid bumps, drops, heavy loads, and pressure, which will effectively extend the service life of the tools. 6) This tool is only suitable for pushing the outer ring of the bearing into the assembly. It is strictly prohibited to use it for other non-pre-set operations such as hoisting, prying workpieces, or overloading.

[0029] The design features of this invention are as follows: 1) The central load-bearing base is a disc-shaped high-strength alloy steel structure with four 90° evenly distributed radial grooves on the circumference; four sets of radially adjustable claws are respectively embedded in the radial grooves and can slide freely along the radial direction; a synchronous adjustment and locking mechanism is set in the center, which consists of an adjustment cover, a central screw, and four sets of linkage rods. Rotating the adjustment cover will drive the linkage rods to push and pull the four sets of claws synchronously to open and close.

[0030] 2) The outer end of each set of grippers is machined with an arc-shaped mating surface that matches the outer ring of the bearing. A non-metallic anti-damage buffer pad is bonded or vulcanized to the arc-shaped mating surface. The radial stroke of the grippers is designed to be limited, and the inner limit position always avoids the bearing cage area, thus structurally isolating the risk of accidental impact.

[0031] 3) The upper end of the central load-bearing base is integrally formed with a hammer-bearing top platform, which is a full-surface circular boss that can withstand hammering or hydraulic pressure. It evenly distributes the axial load to four sets of claws, which act vertically on the outer ring end face of the bearing, and smoothly push the bearing into the bearing housing.

[0032] The working principle and process of this invention are as follows: During use, according to the outer diameter of the bearing outer ring to be installed, rotate the top adjusting cap to drive the four sets of claws to open synchronously, so that the arc-shaped pads of the four claws are evenly attached to the upper outer edge of the bearing outer ring; after confirming that all four claws are on the bearing outer ring and have not touched the inner cage and rollers, straighten the tool so that the center striking force platform is vertically upward; use a copper hammer to gently tap or a press to slowly apply pressure to the force platform, the force is evenly distributed to the four sets of claws through the center base, and the four points synchronously and vertically downward and inward evenly squeeze the bearing outer ring, and smoothly push it into the bearing seat hole into place.

[0033] After installation, rotate the adjusting cap in the opposite direction to allow the four grips to retract synchronously and detach from the bearing outer ring. The tool can then be removed and used directly for assembling the next bearing of a different specification, allowing for repeated use.

[0034] The specific embodiments described herein are merely illustrative of the principles and effects of the invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this invention should still be covered by the claims of this invention.

Claims

1. A four-grip compression bearing outer ring non-destructive uniform push-in installation tool, comprising a central force-bearing base (1), four sets of radially adjustable grippers evenly arranged circumferentially (2), a synchronous adjustment locking mechanism (3), a striking force-bearing top platform (4), and a non-metallic anti-damage buffer layer (5), characterized in that: The four sets of radially adjustable claws (2) are evenly distributed along the 90° circumference of the central force base (1). The four sets of radially adjustable claws (2) can synchronously achieve radial extension and retraction opening and closing. An arc-shaped contact surface is provided at the outer end of each set of radially adjustable claws (2). A non-metallic anti-damage buffer pad layer (5) is fixedly installed on the arc-shaped contact surface. The impact force top platform (4) is integrally set at the top of the central force base (1). The central force base (1) is equipped with a synchronous adjustment locking mechanism (3) to drive the four sets of radially adjustable claws (2) to open and close synchronously. When external pressure is applied to the impact force top platform (4), the load is evenly transmitted to the four sets of radially adjustable claws (2) through the central force base (1), so that the four sets of radially adjustable claws (2) only contact the outer ring end face of the bearing to push in, and do not contact the bearing cage and rollers throughout the process.

2. The four-grip extrusion bearing outer ring non-destructive and uniform push-in installation tool according to claim 1, characterized in that: The synchronous adjustment locking mechanism (3) is a central screw screw linkage structure. By rotating and adjusting the screw cap, the central screw screw and linkage can be linked to drive the four sets of radially adjustable claws (2) to open outward or close inward synchronously, so as to realize stepless adjustment of the opening degree and adapt to the assembly operation of bearing outer rings of various outer diameter specifications.

3. The four-grip extrusion bearing outer ring non-destructive and uniform push-in installation tool according to claim 2, characterized in that: The adjustment cap is exposed at the center of the striking force-bearing top platform (4), the central screw is vertically mounted at the center of the central force-bearing base (1), one end of the four sets of connecting rods is hinged to the central screw, and the other end is correspondingly hinged to each set of radially adjustable claws (2), forming a circumferential linkage telescopic structure to realize the synchronous opening and closing action of the four sets of radially adjustable claws (2).

4. The four-grip extrusion bearing outer ring non-destructive and uniform push-in installation tool according to claim 1, characterized in that: The central force-bearing base (1) is a disc structure. Four radial grooves corresponding to the radially adjustable claws (2) are provided on the disc body of the central force-bearing base (1). The four radial grooves are evenly distributed along the circumference of the central force-bearing base (1) at 90°. The four sets of radially adjustable claws (2) are respectively embedded in the corresponding radial grooves and can slide linearly along the radial grooves. The radial adjustment is completed in conjunction with the screw and connecting rod linkage structure.

5. The four-grip extrusion bearing outer ring non-destructive and uniform push-in installation tool according to claim 1, characterized in that: The four sets of radially adjustable grippers (2) are equipped with a radial stroke limiting structure. The radial stroke limiting structure is matched with the extension stroke setting of the screw connecting rod linkage structure. The extreme position of the gripper's radial retraction does not invade the bearing cage area. Through physical structure isolation, it is used to prevent accidental damage to the bearing cage during the force application process, and eliminate bearing damage and operational safety hazards.

6. The four-grip extrusion bearing outer ring non-destructive and uniform push-in installation tool according to claim 2, characterized in that: The end face of the central force-bearing base (1) is engraved with specification scale markings, which correspond one-to-one with the outer diameter specifications of different bearings. It can be used in conjunction with the synchronous adjustment locking mechanism (3) to quickly align and match the bearing specifications, reduce repeated trial and adjustment operations, and improve assembly efficiency.

7. The four-grip extrusion bearing outer ring non-destructive and uniform push-in installation tool according to claim 1, characterized in that: The impact-bearing top platform (4) is a convex circular structure to ensure that the force is not eccentric and to avoid skewing or jamming during hammering or press operation.

8. The four-grip extrusion bearing outer ring non-destructive and uniform push-in installation tool according to claim 1, characterized in that: The non-metallic anti-damage buffer layer (5) is made of polyurethane or polytetrafluoroethylene and is attached to the outer ring contact surface of the bearing to avoid scratches and bumps on the bearing outer ring and bearing housing mating surface caused by hard metal contact, so as to achieve non-destructive assembly of the bearing.

9. An assembly method based on the tool according to any one of claims 1-8, characterized in that, Includes the following steps: S1. Selection and alignment: According to the outer diameter of the outer ring of the bearing to be installed, refer to the scale markings on the center force base (1), rotate the center adjustment cap, and adjust the opening of the four sets of radially adjustable claws (2) so that the claw opening is slightly larger than the outer diameter of the bearing outer ring. S2, Fitting and positioning: Align the four sets of radially adjustable claws (2) with the outer edge of the upper end of the bearing outer ring, and finely adjust the adjusting cap so that the non-metallic anti-damage buffer pad (5) on the arc-shaped contact surface of the claws is evenly and tightly attached to the outer edge of the bearing outer ring. S3. Safety confirmation: Check the inner clearance of the four sets of radially adjustable claws (2) to ensure that the claws and pads do not touch or squeeze the bearing cage and rollers, and confirm that the assembly clearance is qualified. S4. Apply force evenly: straighten the tool to keep it vertical, and use a copper hammer or wooden hammer to strike the top platform of the force evenly from light to heavy (4), or use a press to slowly and evenly press down the force. S5. Retrieve from position: After the outer ring of the bearing is smoothly pushed into the set assembly position of the bearing seat, stop applying force; rotate the adjusting cap in the opposite direction to close the four sets of radially adjustable claws (2), and complete the tool disassembly and removal.

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