Rotary assembly instrument and bearing assembly device

Abstract

This disclosure relates to the field of bearing assembly technology, and in particular to a rotary assembly apparatus and bearing assembly device. The rotary assembly apparatus provided in this disclosure includes a base; a mounting plate fixed to the base; a turntable and a mounting plate spaced apart along the height direction Z, the turntable and the mounting plate being coaxially arranged and rotatably connected to the base; a ball lowering mechanism disposed on the mounting plate; a ball pressing mechanism disposed on the mounting plate; the assembly mechanism includes a first pushing assembly, a second pushing assembly, and a biasing assembly, the first pushing assembly being disposed on the mounting plate, the second pushing assembly being disposed on the base, the second pushing assembly being disposed opposite to the first pushing assembly, and the biasing assembly being disposed on the base; the first pushing assembly is used to push the outer ring of the bearing, and the second pushing assembly is used to push the inner shaft of the bearing, so that the outer ring of the bearing and the inner shaft of the bearing move towards each other radially along the bearing, causing the central axis of the inner shaft of the bearing to coincide with the central axis of the outer ring of the bearing.

Description

Technical Field

[0001] This disclosure relates to the field of bearing assembly technology, and in particular to a rotary fitting instrument and bearing assembly device. Background Technology

[0002] Assembly refers to the process of assembling the inner shaft, outer ring, rolling elements, and cage of a bearing together according to certain precision requirements.

[0003] Traditional bearing assembly methods mostly rely on manual operation or semi-automated equipment. When assembling manually, workers need to rely on experience to assemble the inner shaft, outer ring, and rolling elements. This is not only labor-intensive and inefficient, but also makes it difficult to ensure consistent assembly precision. Improper operation can easily lead to damage to components, affecting the quality of the bearing. Summary of the Invention

[0004] This disclosure provides a rotary assembly instrument and a bearing assembly device to at least solve the above-mentioned technical problems existing in the prior art.

[0005] The first aspect of this disclosure provides a rotary fitting device, comprising:

[0006] Base;

[0007] Mounting plate, fixed to the base;

[0008] A turntable is provided at intervals along the height direction Z from the mounting plate. The turntable is coaxial with the mounting plate and is rotatably connected to the base.

[0009] A ball-feeding mechanism is provided on the mounting plate, and the ball-feeding mechanism is used to place steel balls into the groove between the inner shaft of the bearing and the outer ring of the bearing.

[0010] A ball-pressing mechanism is provided on the mounting plate, and the ball-pressing mechanism is used to embed the steel ball into the groove;

[0011] The assembly includes a first pushing component, a second pushing component, and a deflection component. The first pushing component is disposed on the mounting plate, the second pushing component is disposed on the base, the second pushing component is disposed opposite to the first pushing component, and the deflection component is disposed on the base.

[0012] The push-off assembly is used to push the outer ring of the bearing so that the central axis of the outer ring of the bearing is offset from the central axis of the inner shaft of the bearing, so that the lower ball mechanism can place the steel ball between the inner shaft of the bearing and the outer ring of the bearing.

[0013] The first jacking assembly is used to push the outer ring of the bearing, and the second jacking assembly is used to push the inner shaft of the bearing. The first jacking assembly and the second jacking assembly are arranged opposite to each other, so that the outer ring of the bearing and the inner shaft of the bearing move towards each other in the radial direction of the bearing so that the central axis of the inner shaft of the bearing coincides with the central axis of the outer ring of the bearing.

[0014] Furthermore, the first pushing assembly includes a first cylinder and a first positioning block, the cylinder body of the first cylinder is connected to the mounting plate, and the telescopic end of the first cylinder is connected to the first positioning block.

[0015] The second pushing assembly includes a second cylinder and a second positioning block. The cylinder body of the second cylinder is connected to the base, and the telescopic end of the second cylinder is connected to the second positioning block. The second positioning block is disposed opposite to the first positioning block.

[0016] Furthermore, the push assembly includes a third cylinder and a push block, the cylinder body of the third cylinder is connected to the base, and the piston rod of the third cylinder is connected to the push block.

[0017] Furthermore, the mounting plate is provided with a first slide rail, which extends in the horizontal direction X. The first slide rail is provided with a first slider, which slides in cooperation with the first slide rail. The lower ball mechanism and the pressing ball mechanism are both disposed on the first slider.

[0018] Furthermore, the first slider is provided with a second slide rail and a third slide rail, both of which extend along the height direction Z;

[0019] The second slide rail is provided with a second slider, the second slider is slidably engaged with the second slide rail, and the lower ball mechanism is disposed on the second slider;

[0020] The third slide rail is provided with a third slider, the third slider is slidably engaged with the third slide rail, and the ball pressing mechanism is disposed on the third slider.

[0021] Furthermore, the ball-feeding mechanism includes a ball-injection mold, a ball-poke rod, and a ball-poke cylinder, with both the ball-injection mold and the ball-poke cylinder disposed on the second slider;

[0022] The output of the ball-poke cylinder is connected to the upper end of the ball-poke rod, and a ball-injection nozzle is connected below the ball-injection mold. The lower end of the ball-poke rod extends into the ball-injection mold to poke the steel ball in the ball-injection mold into the bearing through the ball-injection nozzle.

[0023] Furthermore, the ball-pressing mechanism includes a ball-pressing cylinder, the cylinder body of which is connected to the third slider, and the telescopic end of which is connected to the crescent plate.

[0024] Furthermore, an elastic element is provided between the telescopic end of the ball-pressing cylinder and the crescent plate.

[0025] Furthermore, it also includes a ball-shifting mechanism for adjusting the distribution of the steel balls and a correction mechanism for correcting the position of the steel balls.

[0026] A second aspect of this disclosure provides a bearing assembly apparatus, including the rotary fitting device described in the first aspect.

[0027] The technical solution provided in this disclosure has the following advantages compared with the prior art:

[0028] The rotary assembly apparatus provided in this embodiment includes a base, a mounting plate, and a turntable, with the mounting plate fixed to the base. The turntable and mounting plate are spaced apart along the height direction Z, coaxially arranged, and rotatably connected to the base. A ball-feeding mechanism is located on the mounting plate, used to place steel balls into the groove between the inner shaft and outer ring of the bearing. A ball-pressing mechanism is located on the mounting plate, used to embed the steel balls into the groove. The ball-feeding mechanism, ball-pressing mechanism, and assembly mechanism are arranged around the turntable and mounting plate, cooperating with the rotation of the turntable to achieve continuous conveying of the bearing between various processes.

[0029] The assembly mechanism includes a first pushing assembly, a second pushing assembly, and a offset pushing assembly. The offset pushing assembly pushes the outer ring of the bearing, causing its central axis to deviate from the central axis of the inner shaft of the bearing, facilitating the placement of the steel ball. This allows the ball-laying mechanism to smoothly insert the steel ball between the inner shaft and the outer ring. The first pushing assembly pushes the outer ring, and the second pushing assembly pushes the inner shaft. The first and second pushing assemblies are positioned opposite each other, causing the outer ring and inner shaft to move radially towards each other so that the central axis of the inner shaft coincides with the central axis of the outer ring. The rotary assembly apparatus provided in this disclosure, compared to manual assembly, can improve assembly efficiency while ensuring assembly accuracy.

[0030] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0031] The above and other objects, features, and advantages of this disclosure will become readily apparent from the following detailed description of exemplary embodiments, taken in conjunction with the accompanying drawings. Several embodiments of this disclosure are illustrated in the drawings by way of example and not limitation, in which:

[0032] In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0033] Figure 1A schematic diagram of the structure of the rotary fitting instrument provided in the embodiments of this disclosure is shown. Figure 1 ;

[0034] Figure 2 A schematic diagram of the structure of the rotary fitting instrument provided in the embodiments of this disclosure is shown. Figure 2 ;

[0035] Figure 3 A partial structural schematic diagram of the rotary fitting apparatus provided in this embodiment is shown. Figure 1 ;

[0036] Figure 4 A partial structural schematic diagram of the rotary fitting apparatus provided in this embodiment is shown. Figure 2 .

[0037] The following are the labeling instructions in the diagram: 11. Base; 12. Mounting plate; 13. Turntable; 2. Ball lowering mechanism; 21. Ball injection mold; 22. Ball-poke rod; 23. Ball-poke cylinder; 24. Ball injection nozzle; 3. Ball pressing mechanism; 31. Ball pressing cylinder; 32. Crescent plate; 41. Ball-pushing mechanism; 42. Correction mechanism; 5. First pushing assembly; 51. First cylinder; 52. First positioning block; 6. Second pushing assembly; 61. Second cylinder; 62. Second positioning block; 7. Pushing assembly; 71. Third cylinder; 72. Push block; 81. First slide rail; 82. First slider; 83. First adjusting cylinder; 84. Second slide rail; 85. Second slider; 86. Second adjusting cylinder; 87. Third slide rail; 88. Third slider; 89. Third adjusting cylinder. Detailed Implementation

[0038] To make the objectives, features, and advantages of this disclosure more apparent and understandable, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0039] Combination Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the rotary assembly apparatus provided in this embodiment includes a base 11, a mounting plate 12, and a turntable 13. The mounting plate 12 is fixed to the base 11. The turntable 13 and the mounting plate 12 are spaced apart along the height direction Z, and the turntable 13 and the mounting plate 12 are coaxially arranged. The turntable 13 is rotatably connected to the base 11. A ball-feeding mechanism 2 is disposed on the mounting plate 12, and the ball-feeding mechanism 2 is used to place steel balls into the groove between the inner shaft and the outer ring of the bearing. A ball-pressing mechanism 3 is disposed on the mounting plate 12, and the ball-pressing mechanism 3 is used to embed the steel balls into the groove. The ball-feeding mechanism 2, the ball-pressing mechanism 3, and the assembly mechanism are arranged around the turntable 13 and the mounting plate 12, and the rotation of the turntable 13 is used to realize the continuous conveying of the bearing between each process.

[0040] The assembly mechanism includes a first pushing component 5, a second pushing component 6, and a deflection component 7. The first pushing component 5 is disposed on the mounting plate 12, the second pushing component 6 is disposed on the base 11, and the second pushing component 6 is disposed opposite to the first pushing component 5. The deflection component 7 is disposed on the base 11. The deflection component 7 is used to push the outer ring of the bearing so that the central axis of the outer ring of the bearing deviates from the central axis of the inner shaft of the bearing, so that the lower ball mechanism 2 can place the steel ball between the inner shaft of the bearing and the outer ring of the bearing. The first pushing component 5 is used to push the outer ring of the bearing, and the second pushing component 6 is used to push the inner shaft of the bearing. The first pushing component 5 and the second pushing component 6 are disposed opposite to each other so that the outer ring of the bearing and the inner shaft of the bearing move towards each other in the radial direction of the bearing so that the central axis of the inner shaft of the bearing and the central axis of the outer ring of the bearing coincide.

[0041] The first and second pushing components 5 and 6 are positioned opposite each other to push the outer ring and inner shaft of the bearing, respectively, which improves the smoothness of bearing assembly. The offset component 7, before the ball-feeding mechanism 2 lowers the steel ball, causes the outer ring and inner shaft of the bearing to become eccentric, facilitating the injection of the steel ball. The first and second pushing components 5 and 6, positioned opposite each other, push the outer ring and inner shaft of the bearing to move towards each other, aligning the central axis of the inner shaft with that of the outer ring, ensuring consistent fit between the steel ball and the inner and outer raceways. The rotary assembly apparatus provided in this disclosure, compared to manual assembly, can improve assembly efficiency while ensuring assembly accuracy.

[0042] The bearing assembly instrument provided in this embodiment can ensure high precision in bearing assembly and improve production efficiency. It is suitable for large-scale, high-quality bearing assembly scenarios and has strong practical value and technical advantages.

[0043] In some specific embodiments, the first pushing assembly 5 includes a first cylinder 51 and a first positioning block 52. The cylinder body of the first cylinder 51 is connected to the mounting plate 12, and the telescopic end of the first cylinder 51 is connected to the first positioning block 52. The second pushing assembly 6 includes a second cylinder 61 and a second positioning block 62. The cylinder body of the second cylinder 61 is connected to the base 11, and the telescopic end of the second cylinder 61 is connected to the second positioning block 62. The second positioning block 62 is arranged opposite to the first positioning block 52. The design of the first pushing assembly 5 (including the first cylinder 51 and the first positioning block 52) and the second pushing assembly 6 (including the second cylinder 61 and the second positioning block 62) achieves efficient and precise pushing of the inner shaft of the bearing through the coordinated action of the first cylinder 51 driving the first positioning block 52 and the second cylinder 61 driving the second positioning block 62. The first pushing assembly 5 and the second pushing assembly 6 have simple structures and high integration, making them easy to install on the mounting plate 12 and the base 11. They form a compact layout with the push-off assembly 7 of the assembly mechanism, reducing the space occupied by the equipment.

[0044] In some specific embodiments, the push-off assembly 7 includes a third cylinder 71 and a pusher block 72. The cylinder body of the third cylinder 71 is connected to the base 11, and the piston rod of the third cylinder 71 is connected to the pusher block 72. The third cylinder 71, as a drive source, provides stable thrust. The extension and retraction of the piston rod drives the pusher block 72 to move linearly, allowing control over the direction and stroke of the force applied by the pusher block 72 to the outer ring of the bearing. This ensures that the outer ring can move smoothly radially (i.e., perpendicular to the bearing's central axis). The eccentricity between the outer ring and the inner shaft of the bearing facilitates the injection of steel balls.

[0045] In some specific embodiments, the mounting plate 12 is provided with a first slide rail 81, which extends horizontally in the X direction. The first slide rail 81 is provided with a first slider 82, which slides in cooperation with the first slide rail 81. The cylinder body of the first adjusting cylinder 83 is connected to the first slide rail 81, and the telescopic end of the first adjusting cylinder 83 is connected to the first slider 82. The lowering ball mechanism 2 and the pressing ball mechanism 3 are both located on the first slider 82, allowing the first slider 82 to drive the lowering ball mechanism 2 and the pressing ball mechanism 3 to slide in the X direction, thereby flexibly adjusting their relative positions to the bearings on the rotating disc 13. Since both the lowering ball mechanism 2 and the pressing ball mechanism 3 are located on the same first slider 82, they can achieve synchronous position adjustment through the sliding of the first slider 82, realizing the lowering and pressing ball operations on the bearings. The compact layout reduces the space occupied.

[0046] In some specific embodiments, the first slider 82 is provided with a second slide rail 84 and a third slide rail 87, both of which extend along the height direction Z. The second slide rail 84 is provided with a second slider 85, which slides in cooperation with the second slide rail 84. The ball-dropping mechanism 2 is disposed on the second slider 85. The cylinder body of the second adjusting cylinder 86 is connected to the second slide rail 84, and the telescopic end of the second adjusting cylinder 86 is connected to the second slider 85, for driving the ball-dropping mechanism 2 to move up and down along the height direction. Optionally, the cylinder body of the second adjusting cylinder 86 is connected to the first slider 82, and the telescopic end of the second adjusting cylinder 86 is connected to the second slide rail 84. The ball-dropping mechanism 2 can adjust its height according to the vertical position of the channel (such as the height from the turntable 13) to ensure that the steel ball can fall accurately into the channel and avoid the steel ball getting stuck in the gap between the inner and outer rings or deviating from the channel due to height deviation.

[0047] The third slide rail 87 is equipped with a third slider 88, which slides in conjunction with the third slide rail 87. The ball pressing mechanism 3 is located on the third slider 88. The cylinder body of the third adjusting cylinder 89 is connected to the third slide rail 87, and the telescopic end of the second adjusting cylinder 86 is connected to the third slider 88, used to drive the ball pressing mechanism 3 to move up and down in the height direction. Optionally, the cylinder body of the third adjusting cylinder 89 is connected to the third slider 88, and the telescopic end of the second adjusting cylinder 86 is connected to the third slide rail 87. The ball pressing mechanism 3 can adjust its height according to the embedding depth of the steel ball in the groove to ensure that the pressure head can be vertically aligned with the center of the steel ball to apply effective pressure. The height (thickness) of the inner shaft and outer ring of the bearing will vary with the model, and the installation height of the steel ball in the groove also needs to be adjusted accordingly. The second slide rail 84 (ball lowering mechanism 2) and the third slide rail 87 (ball pressing mechanism 3) extend in the Z direction (height direction), so that their heights can be independently adjusted by the second slider 85 and the third slider 88, respectively.

[0048] In some specific embodiments, the ball-feeding mechanism 2 includes a ball-injection mold 21, a ball-push rod 22, and a ball-push cylinder 23. Both the ball-injection mold 21 and the ball-push cylinder 23 are mounted on the second slider 85. The output of the ball-push cylinder 23 is connected to the upper end of the ball-push rod 22. A ball-injection nozzle 24 is connected below the ball-injection mold 21. The lower end of the ball-push rod 22 extends into the ball-injection mold 21 to push the steel ball inside the mold 21 into the bearing through the ball-push nozzle 24. The ball-injection mold 21 typically has a cavity or channel matching the size of the steel ball, which can temporarily store and position the steel ball, ensuring that the steel ball is in a preset posture before being released. The lower end of the ball-push rod 22 extends into the ball-injection mold 21, precisely matching the mold cavity, and can push a single steel ball (or a preset number of steel balls) from inside the mold along a fixed trajectory to the ball-push nozzle 24. The outlet position of the ball nozzle 24 can be designed at a specific angle (such as oblique or vertical) according to the bearing groove design. Combined with the height adjustment of the second slider 85 in the Z direction, the steel ball can be accurately dropped into the designated position in the groove.

[0049] In some specific embodiments, the ball-pressing mechanism 3 includes a ball-pressing cylinder 31. The cylinder body of the ball-pressing cylinder 31 is connected to the third slider 88, and the telescopic end of the ball-pressing cylinder 31 is connected to the crescent plate 32. The ball-pressing cylinder 31 serves as a power source, providing a stable and adjustable thrust. When the steel ball is placed into the channel by the ball-dropping mechanism 2, the cylinder drives the telescopic end to extend, causing the crescent plate 32 to apply vertical or oblique pressure to the steel ball, causing the steel ball to spread out and tightly adhere to the inner wall of the channel.

[0050] In some specific embodiments, an elastic element is provided between the telescopic end of the ball-pressing cylinder 31 and the crescent plate 32. The elastic element can absorb the instantaneous impact force of the telescopic end of the ball-pressing cylinder 31, transforming rigid pressure into flexible pressure. When the crescent plate 32 contacts the steel ball, the elastic element buffers the pressure through its own deformation (such as spring compression or rubber deformation), avoiding "hard impact" caused by excessive cylinder thrust, excessively fast response, or positioning error—preventing the steel ball from being deformed and the bearing groove from being damaged.

[0051] In some specific embodiments, the system also includes a ball-distributing mechanism 41 for adjusting the distribution of steel balls and a correction mechanism 42 for correcting the position of the steel balls. To address the potential issues of "piling up and uneven spacing" of steel balls after the ball-dropping mechanism 2, the ball-distributing mechanism 41 can evenly distribute the steel balls along the circumference of the bearing groove. The correction mechanism 42 can solve the problems of "skewness and deviation from the groove center" that may occur after the steel balls are dropped or distributed, ensuring that the steel balls are fully embedded in the groove and maintain the correct posture. Each rotation of the turntable 13 (approximately 2-3 seconds) simultaneously completes the processes of dropping, pressing, distributing, correcting, and assembling the bearing, improving assembly efficiency.

[0052] The bearing assembly apparatus provided in this disclosure includes the rotary assembly apparatus provided in this disclosure. Since the bearing assembly apparatus provided in this disclosure and the rotary assembly apparatus provided in this disclosure have the same advantages, they will not be described again here.

[0053] It should be understood that the various forms of processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this invention disclosure can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this embodiment can be achieved, and this is not limited herein.

[0054] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means two or more, unless otherwise explicitly specified.

[0055] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A rotary fitting instrument, characterized in that, include: Base (11); Mounting plate (12) is fixed to the base (11); A turntable (13) is spaced apart from the mounting plate (12) along the height direction (Z). The turntable (13) is coaxial with the mounting plate (12). The turntable (13) is rotatably connected to the base (11). A ball lowering mechanism (2) is provided on the mounting plate (12), and the ball lowering mechanism (2) is used to put steel balls into the groove between the inner shaft of the bearing and the outer ring of the bearing; A ball-pressing mechanism (3) is disposed on the mounting plate (12), and the ball-pressing mechanism (3) is used to embed the steel ball into the groove; The assembly includes a first pushing component (5), a second pushing component (6), and a deflection component (7). The first pushing component (5) is disposed on the mounting plate (12), the second pushing component (6) is disposed on the base (11), the second pushing component (6) is disposed opposite to the first pushing component (5), and the deflection component (7) is disposed on the base (11). The push-off assembly (7) is used to push the outer ring of the bearing so that the central axis of the outer ring of the bearing deviates from the central axis of the inner shaft of the bearing so that the lower ball mechanism (2) places the steel ball between the inner shaft of the bearing and the outer ring of the bearing. The first push assembly (5) is used to push the outer ring of the bearing, and the second push assembly (6) is used to push the inner shaft of the bearing. The first push assembly (5) and the second push assembly (6) are arranged opposite to each other so that the outer ring of the bearing and the inner shaft of the bearing move towards each other in the radial direction of the bearing so that the central axis of the inner shaft of the bearing coincides with the central axis of the outer ring of the bearing.

2. The rotary fitting instrument according to claim 1, characterized in that, The first push assembly (5) includes a first cylinder (51) and a first positioning block (52). The cylinder body of the first cylinder (51) is connected to the mounting plate (12), and the telescopic end of the first cylinder (51) is connected to the first positioning block (52). The second pushing assembly (6) includes a second cylinder (61) and a second positioning block (62). The cylinder body of the second cylinder (61) is connected to the base (11), and the telescopic end of the second cylinder (61) is connected to the second positioning block (62). The second positioning block (62) is arranged opposite to the first positioning block (52).

3. The rotary fitting instrument according to claim 1, characterized in that, The push assembly (7) includes a third cylinder (71) and a push block (72). The cylinder body of the third cylinder (71) is connected to the base (11), and the piston rod of the third cylinder (71) is connected to the push block (72).

4. The rotary fitting instrument according to claim 1, characterized in that, The mounting plate (12) is provided with a first slide rail (81), which extends in the horizontal direction (X). The first slide rail (81) is provided with a first slider (82), which slides in cooperation with the first slide rail (81). The lower ball mechanism (2) and the pressing ball mechanism (3) are both located on the first slider (82).

5. The rotary fitting apparatus according to claim 4, characterized in that, The first slider (82) is provided with a second slide rail (84) and a third slide rail (87), both of which extend along the height direction (Z); The second slide rail (84) is provided with a second slider (85), the second slider (85) is slidably engaged with the second slide rail (84), and the lower ball mechanism (2) is disposed on the second slider (85); The third slide rail (87) is provided with a third slider (88), the third slider (88) is slidably engaged with the third slide rail (87), and the ball pressing mechanism (3) is disposed on the third slider (88).

6. The rotary fitting instrument according to claim 5, characterized in that, The ball-feeding mechanism (2) includes a ball-feeding mold (21), a ball-feeding rod (22), and a ball-feeding cylinder (23), wherein the ball-feeding mold (21) and the ball-feeding cylinder (23) are both disposed on the second slider (85); The output of the ball-poke cylinder (23) is connected to the upper end of the ball-poke rod (22). A ball-injection nozzle (24) is connected below the ball-injection mold (21). The lower end of the ball-poke rod (22) extends into the ball-injection mold (21) to poke the steel ball in the ball-injection mold (21) into the bearing through the ball-injection nozzle (24).

7. The rotary fitting apparatus according to claim 5, characterized in that, The ball pressing mechanism (3) includes a ball pressing cylinder (31), the cylinder body of which is connected to the third slider (88), and the telescopic end of which is connected to the crescent plate (32).

8. The rotary fitting instrument according to claim 7, characterized in that, An elastic element is provided between the telescopic end of the ball-pressing cylinder (31) and the crescent plate (32).

9. The rotary fitting instrument according to claim 1, characterized in that, It also includes a ball-distributing mechanism (41) for adjusting the distribution of the steel balls and a correction mechanism (42) for correcting the position of the steel balls.

10. A bearing assembly device, characterized in that, Includes the rotary fitting device as described in any one of claims 1 to 9.

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