A rotating shaft assembly device

Abstract

This invention relates to the field of workpiece assembly technology, specifically disclosing a rotating shaft assembly device, comprising: a frame, an upper press mounted on the frame, and an upper conveying mechanism for conveying bearings. The pressing sleeve mechanism includes two semi-arc plates rotatably mounted on the lower end of the upper press. When the two semi-arc plates are closed, they form a sleeve structure for abutting against the inner ring of the bearing. A guiding mechanism is used to push the two semi-arc plates away from each other and open when the upper press rises. When the bearing is conveyed to the installation position, the two semi-arc plates close and abut against the upper end face of the bearing inner ring. The lower press pushes the shaft upward, so that the upper end of the shaft is inserted into the bearing inner ring to complete the pressing. The upper press drives the two semi-arc plates to move upward, and the two semi-arc plates rotate around their respective rotation axes and open. Subsequently, the upper conveying mechanism drives the bearing to move out along the opening formed between the two semi-arc plates. The beneficial effects of this invention are: it can improve assembly efficiency and assembly accuracy.

Description

Technical Field

[0001] This invention relates to the field of workpiece assembly technology, and more specifically to a rotating shaft assembly device. Background Technology

[0002] During the assembly of shafts and bearings, the quality of bearing installation directly affects the rotational stability of the shaft and the service life of the equipment. Therefore, press-fitting equipment is usually required to install the bearings onto the shaft. In existing shaft assembly processes, a press is often used to drive a sleeve downwards to press the inner ring of the bearing while simultaneously inserting the shaft into the inner ring to complete the assembly. This avoids damage to the bearing rolling elements during press-fitting. However, in the continuous assembly of long shaft-type workpieces, the traditional integral sleeve needs to be completely detached from the upper end of the shaft after press-fitting before the installed shaft can be removed. This results in a large idle stroke of the press, affecting the efficiency of continuous assembly. Therefore, a technical means is needed to quickly release the shaft after press-fitting.

[0003] Chinese patent document CN117817304B discloses an installation device and method for a dual-bearing encoder, including a base and a pressing assembly and a pressure-bearing assembly mounted on the base. The pressure-bearing assembly includes a shaft top member with its bottom fixed to the base and a central hole on its end face, and a support ring block sleeved on the end of the shaft top member, capable of being in a pre-pressed or pressed position. The encoder shaft of the dual-axis encoder is inserted into the central hole and its upper end passes through the support ring block. When the support ring block is in the pre-pressed position, its upper end face is higher than the shoulder face of the encoder shaft; when the support ring block is in the pressed position, its upper end face is lower than the shoulder face of the encoder shaft. The pressing assembly is used to press the bearing to be installed onto the encoder shaft. The pressure-bearing assembly also includes multiple stepped shafts, which are mounted on the base and arranged circumferentially along the support ring block. The support ring block includes a sleeve structure and an extension connected to the outer wall of the sleeve structure. The sleeve structure is fitted onto the end of the shaft top member. The extension has multiple through holes, each extending circumferentially along the support ring block. Each of the multiple stepped shafts passes through a corresponding through hole and can slide between a first position and a second position along the inner wall of the through hole. When the stepped shaft is in the first position, the support ring block is in the pre-pressed position. When the stepped shaft is in the second position, the support ring block is in the press-fit position. Its main feature is that it uses a press-fit sleeve to press-fit the inner ring of the bearing, thereby avoiding damage to the bearing caused by knocking. However, the press-fit sleeve used is usually an integral structure. In the press-fitting process of long shaft workpieces, after the press-fitting is completed, it is necessary to wait for the sleeve to completely exit above the rotating shaft before the rotating shaft can be removed, resulting in a slow press-fitting cycle, which is difficult to meet the requirements of continuous automatic assembly.

[0004] In addition, existing shaft assembly equipment has the following drawbacks: First, traditional integral press sleeves cannot quickly release the shaft laterally after press-fitting, resulting in a large idle stroke and low continuous assembly efficiency. Second, during the conveying process, there is a play between the inner and outer rings of the bearing, and the bearing's placement on the conveyor belt may be off-center, which can easily lead to misalignment between the bearing's inner ring and the press sleeve, thus affecting the assembly accuracy of the shaft and bearing. Third, existing equipment usually requires additional positioning fixtures or manual correction of the bearing position, resulting in a complex equipment structure and low automation. Fourth, existing positioning structures are difficult to automatically avoid the shaft after press-fitting, which can easily affect the normal assembly of the shaft and bearing. Summary of the Invention

[0005] This invention provides a rotating shaft assembly device, which aims to solve the problem in the continuous assembly process of long shaft workpieces in related technologies that, after the traditional integral sleeve is pressed, it needs to be completely detached from the upper end of the rotating shaft before the installed rotating shaft can be moved out, resulting in a large idle stroke of the press and affecting the efficiency of continuous assembly.

[0006] A shaft assembly device includes a frame, an upper press mounted on the frame, and an upper conveying mechanism for conveying bearings, and further includes: The lower conveyor mechanism, located below the upper conveyor mechanism, is used to convey the shaft; The press-fit sleeve mechanism includes two semi-arc plates rotatably mounted on the lower end of the upper press. When the two semi-arc plates are closed, they form a sleeve structure for abutting against the inner ring of the bearing. The guide mechanism, mounted on the frame, is used to push the two semi-circular plates away from each other and open them when the upper press rises; A lower press is located below the lower conveying mechanism, and the lower press is used to push the shaft upward; After the bearing is delivered to the installation position, the two semi-circular plates close together and abut against the upper end face of the bearing inner ring. The lower press pushes the shaft upward, so that the upper end of the shaft is inserted into the bearing inner ring to complete the press installation. After the pressing is completed, the upper press drives the two semi-arc plates to move upward. The two semi-arc plates rotate around their respective rotation axes and open. Then, the upper conveying mechanism drives the bearing to move out along the opening formed between the two semi-arc plates. This eliminates the need to wait for the pressing sleeve to completely detach from the upper end of the shaft before removing the shaft, reducing the press's idle stroke and improving continuous assembly efficiency.

[0007] Preferably, the rotation axes of the two semi-arc plates are located at one end of the corresponding semi-arc plate along the circumferential direction, and the rotation axes of the two semi-arc plates are parallel to the axis of the semi-arc plate, so that the two semi-arc plates can rotate stably around the corresponding rotation axis and form a complete sleeve structure when closed.

[0008] Preferably, the guiding mechanism includes a guide plate fixedly mounted on the frame. The lower end of the guide plate is provided with two opposing guide ramps. When the upper press drives the two semi-arc plates to move upward, the upper ends of the two semi-arc plates abut against the corresponding guide ramps, thereby causing the two semi-arc plates to rotate and open around their respective rotation axes. Thus, the opening of the semi-arc plates is automatically achieved by utilizing the return stroke of the upper press, without the need for an additional driving mechanism.

[0009] Preferably, torsion springs are provided between the two semi-circular plates and the upper press. The torsion springs are used to drive the two semi-circular plates to move closer to each other and maintain a closing tendency, so that the two semi-circular plates can automatically close during the descent process, thereby improving the pressing stability.

[0010] Preferably, the frame is provided with a clearance groove, and the upper conveying mechanism includes two upper conveyor belts located in the clearance groove. A gap is formed between the two upper conveyor belts for the shaft to pass through, thereby facilitating the shaft to be inserted into the inner ring of the bearing from below and ensuring the stability of the bearing during the conveying process.

[0011] Preferably, the lower conveying mechanism includes a lower conveyor belt mounted on a frame. The lower conveyor belt has multiple through holes, and the shaft is inserted into the holes. The shaft is provided with a ring platform for contacting the lower conveyor belt, thereby keeping the shaft stable during the conveying process and preventing the shaft from falling off the lower conveyor belt.

[0012] Preferably, the upper press is further provided with a positioning mechanism, which includes an elastic telescopic rod coaxially mounted on the upper press. The elastic telescopic rod is coaxially mounted with a sleeve formed by two semi-arc plates, and the lower end of the elastic telescopic rod extends beyond the lower ends of the two semi-arc plates, so that the elastic telescopic rod can extend into the inner ring of the bearing before the semi-arc plates for positioning.

[0013] Preferably, the lower end of the elastic telescopic rod is hinged with multiple positioning rods, which are evenly distributed along the circumference of the elastic telescopic rod. A collar is slidably sleeved on the elastic telescopic rod, and a spring is provided between the collar and the elastic telescopic rod. A connecting rod is hinged between the collar and the positioning rod. The spring is used to drive the collar to reset and drive the multiple positioning rods to maintain an open trend. When the collar moves along the elastic telescopic rod, the collar drives the multiple positioning rods to open or close synchronously through the connecting rod, thereby realizing the synchronous linkage of the multiple positioning rods and improving the bearing positioning accuracy.

[0014] Preferably, each of the plurality of positioning rods has a roller rotatably mounted at the end away from the elastic telescopic rod. When the elastic telescopic rod is inserted into the inner ring of the bearing, the plurality of rollers abut against the inner ring of the bearing and push the inner ring of the bearing to move horizontally during the retraction of the positioning rod, so that the inner ring of the bearing is coaxial with the elastic telescopic rod, thereby realizing the automatic correction of the inner ring of the bearing and improving the coaxiality of the shaft and bearing assembly.

[0015] Preferably, a limiting plate is provided on the inner side of the semi-arc plate. When the two semi-arc plates are opened, the limiting plate abuts against the ring platform on the elastic telescopic rod to restrict the elastic telescopic rod from extending downward, thereby preventing the elastic telescopic rod from extending too far downward in the standby state and affecting the subsequent bearing conveying.

[0016] By adopting the above technical solution, the beneficial effects of the present invention are as follows: 1. By setting up a semi-arc plate that can open automatically, the bearing after press-fitting can be moved directly out through the opening formed between the semi-arc plates without waiting for the press sleeve to completely exit the upper end of the shaft before taking out the shaft, thereby reducing the idle stroke of the press and improving the efficiency of continuous assembly. 2. By setting guide plates and guide ramps, the two semi-circular plates can automatically open during the return stroke of the upper press, thus eliminating the need for an additional drive mechanism and reducing the complexity of the equipment structure; 3. By setting torsion springs, the two semi-circular plates can automatically close during descent, thereby improving the stability of the sleeve structure during the pressing process; 4. By setting up upper and lower conveying mechanisms, bearings and shafts can be automatically conveyed to the installation position, thereby improving the automation level of the equipment; 5. By setting a positioning mechanism, the elastic telescopic rod can enter the inner ring of the bearing before the semi-circular plate for positioning, thereby improving the bearing positioning accuracy; 6. By setting multiple positioning rods that can open and retract synchronously, multiple rollers push the inner ring of the bearing to move during the retraction process, thereby realizing the automatic correction of the inner ring of the bearing and improving the coaxiality of the shaft and bearing assembly. 7. By setting a limit plate, the downward movement of the elastic telescopic rod can be restricted when the semi-circular plate is opened. This prevents the elastic telescopic rod from releasing rapidly after the top of the shaft separates from the contact point, which would cause the lower end of the elastic telescopic rod to hit the newly installed bearing. It also avoids affecting the subsequent bearing conveying and improves the stability of equipment operation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is a cross-sectional view of the frame of the present invention.

[0019] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0020] Figure 4 This is a schematic diagram of the press-fit sleeve mechanism of the present invention.

[0021] Figure 5 This is a top view of the two semi-circular plates of the present invention when they are opened.

[0022] Figure label: 1. Frame; 2. Upper press; 3. Upper conveying mechanism; 4. Lower conveying mechanism; 5. Pressing sleeve mechanism; 51. Semi-arc plate; 52. Limiting plate; 6. Guide mechanism; 61. Guide plate; 7. Lower press; 8. Positioning mechanism; 81. Elastic telescopic rod; 82. Positioning rod; 83. Roller; 84. Collar; 85. Spring; 86. Connecting rod. Detailed Implementation

[0023] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0024] like Figures 1-5 As shown, an embodiment of the present invention provides a shaft assembly device, comprising a frame 1, an upper press 2 mounted on the frame 1, an upper conveying mechanism 3 for conveying bearings, a lower conveying mechanism 4 for conveying shafts, a pressing sleeve mechanism 5, a guiding mechanism 6, a lower press 7, and a positioning mechanism 8. When the upper conveying mechanism 3 conveys the bearing to the installation position, the positioning mechanism 8 first positions the inner ring of the bearing, ensuring that the inner ring is coaxial with the shaft. Then, the upper press 2 drives the pressing sleeve mechanism 5 downwards to press against the upper end face of the inner ring of the bearing. Afterwards, the lower press 7 pushes the shaft upwards, inserting the upper end of the shaft into the inner ring of the bearing to complete the pressing. After pressing, the upper press 2 drives the pressing sleeve mechanism 5 upwards, and then the upper conveying mechanism 3 drives the bearing to move to the right. All components work together to achieve continuous automatic pressing of the bearing and shaft, improving assembly efficiency and ensuring assembly accuracy. The positioning mechanism 8 and the guiding mechanism 6 work together to ensure that the bearing automatically corrects the inner ring position after being conveyed to the correct position and is smoothly removed after pressing, without manual intervention.

[0025] like Figures 1-2 As shown, the upper press 2 is mounted above the frame 1 and can move vertically to drive the pressing sleeve mechanism 5 to move.

[0026] like Figures 1-4 As shown, the upper conveying mechanism 3 includes two upper conveyor belts that convey in the left and right directions. The upper conveyor belts are in the shape of a ring. A clearance groove is provided on the frame 1 that runs through the left and right. Both upper conveyor belts are set in the clearance groove. The two upper conveyor belts are arranged in the front and back directions, and a gap is formed between the two upper conveyor belts to allow the shaft to pass through.

[0027] like Figures 1-5As shown, the press-fitting sleeve mechanism 5 includes two semi-arc plates 51. The two semi-arc plates 51 are respectively mounted on the lower end of the upper press 2 through their respective rotating shafts. The rotating shaft is located at one end of the semi-arc plate 51 along the circumferential direction and is parallel to the axis of the semi-arc plate 51. After the two semi-arc plates 51 are closed, they form a sleeve structure for abutting against the inner ring of the bearing. A torsion spring (not shown in the figure) is provided between the semi-arc plate 51 and the upper press 2 to drive the semi-arc plate 51 to close together during the descent of the upper press 2, so as to ensure the stability of the sleeve structure during the press-fitting process.

[0028] like Figures 2-4 As shown, the guide mechanism 6 includes a guide plate 61 fixedly installed on the frame 1. The lower end of the guide plate 61 is provided with a corresponding guide slope. When the upper press 2 drives the semi-arc plate 51 to rise, the upper end of the semi-arc plate 51 contacts the guide slope, causing the semi-arc plate 51 to rotate and open around the rotation axis, providing an opening for the bearing and shaft to move to the right after the press is completed.

[0029] The lower conveyor mechanism 4 is located below the upper conveyor mechanism 3 and is used to convey the shaft in the left-right direction. The lower conveyor mechanism 4 includes an annular lower conveyor belt with multiple through holes. The shaft is inserted into the holes, and there is an annular platform on the shaft that abuts against the lower conveyor belt. The shaft is inserted into the holes to ensure that it will not fall off during the conveying process, and at the same time, it ensures that the shaft can remain coaxial with the upper press 2 and the semi-arc plate 51 in the pressing position. The lower press 7 is located inside the lower conveyor belt and is used to push the shaft upward so that the upper end of the shaft is accurately inserted into the inner ring of the bearing to complete the pressing. The lower conveyor belt and the lower press 7 cooperate with the upper press 2 and the semi-arc plate 51 to fully realize the interference fit between the bearing and the shaft and maintain stability throughout the pressing process.

[0030] like Figures 1-5 As shown, the positioning mechanism 8 includes an elastic telescopic rod 81 coaxially mounted on the upper press 2. In its original length state, the lower end of the elastic telescopic rod 81 extends beyond the lower end of the semi-arc plate 51, and extends into the inner ring of the bearing for positioning before the bearing reaches its final position. Multiple positioning rods 82 are hinged to the lower end of the elastic telescopic rod 81, evenly distributed along the circumference of the elastic telescopic rod 81. Rollers 83 are mounted on the ends of the positioning rods 82 for contacting the inner ring of the bearing. A collar 84 is slidably fitted onto the elastic telescopic rod 81 in the vertical direction, and a connecting rod is provided between the collar 84 and the positioning rods 82. 86. The two ends of the connecting rod 86 are hinged to the collar 84 and the positioning rod 82 respectively. A spring 85 is provided between the collar 84 and the elastic telescopic rod 81. The spring 85 is used to keep the collar 84 in the reset position and drive the positioning rod 82 to keep it in the open state. When the collar 84 moves along the elastic telescopic rod 81, the connecting rod 86 drives multiple positioning rods 82 to open or retract synchronously, realizing the automatic correction of the bearing inner ring, making it coaxial with the elastic telescopic rod 81, ensuring that the shaft can maintain coaxial cooperation with the bearing inner ring during the insertion process, and improving the assembly accuracy. A limiting plate 52 is provided on the inner side of the semi-circular plate 51 located at the front. When the semi-circular plate 51 is opened, the limiting plate 52 abuts against the ring platform on the elastic telescopic rod 81, restricting the elastic telescopic rod 81 from extending downward. This prevents the elastic telescopic rod 81 from releasing quickly after it disengages from the top of the shaft, causing the lower end of the elastic telescopic rod 81 to hit the newly installed bearing.

[0031] The specific working principle of the rotating shaft assembly device of the present invention is as follows: In use, the bearing to be installed is first placed on the two upper conveyor belts. The two upper conveyor belts rotate in the left and right directions, thereby driving the bearing to move in the left and right directions and moving the bearing to the installation position. At the same time, the shaft to be installed is inserted into the placement hole on the lower conveyor belt. The ring on the shaft abuts against the upper surface of the lower conveyor belt, thereby preventing the shaft from falling out of the placement hole. When the lower conveyor belt rotates, it drives the shaft to move synchronously and moves the shaft below the installation position.

[0032] After the bearing and shaft are moved to their respective installation positions, the upper and lower conveyor belts stop rotating. At this time, the upper press 2 begins to move downward. During the descent of the upper press 2, due to the torsion springs installed between the two semi-arc plates 51 and the upper press 2, the two semi-arc plates 51 gradually approach each other under the action of the torsion springs and gradually form a sleeve structure. At the same time, during the process of the two semi-arc plates 51 approaching each other, the limiting plate 52 on the semi-arc plate 51 disengages from the ring platform on the elastic telescopic rod 81, and then the elastic telescopic rod 81 is released. Since the lower end of the elastic telescopic rod 81 is lower than the lower end of the two semi-arc plates 51, the lower end of the elastic telescopic rod 81 enters the inner ring of the bearing first.

[0033] As the elastic telescopic rod 81 moves downward, the rollers 83 at the lower ends of the multiple positioning rods 82 first abut against the upper edge of the inner ring of the bearing. At this time, since the multiple positioning rods 82 are in an open state, the multiple rollers 83 are located outside the inner diameter of the inner ring of the bearing. Subsequently, as the elastic telescopic rod 81 continues to descend, the upper edge of the inner ring of the bearing gradually pushes the multiple rollers 83 to move inward, thereby driving the multiple positioning rods 82 to rotate around the corresponding hinge point. When the multiple positioning rods 82 rotate, they drive the collar 84 to move upward along the elastic telescopic rod 81 through the connecting rod 86, and compress the spring 85.

[0034] As multiple rollers 83 gradually enter the inner side of the bearing inner ring, they gradually come into contact with the inner wall of the bearing inner ring. Since the lower ends of the two semi-arc plates 51 have not yet come into contact with the upper end face of the bearing inner ring, the bearing inner ring can move in the horizontal direction. When there is a deviation between the axis of the bearing inner ring and the axis of the elastic telescopic rod 81, after the multiple rollers 83 come into contact with the inner wall of the bearing inner ring, the multiple rollers 83 will continue to push the bearing inner ring to move in the horizontal direction until the axis of the bearing inner ring coincides with the axis of the elastic telescopic rod 81.

[0035] After the bearing inner ring is positioned, the upper press 2 continues to move downward. At this time, the lower ends of the two semi-arc plates 51 gradually come into contact with the upper end face of the bearing inner ring and form an axial limit on the bearing inner ring. Then the lower press 7 begins to move upward and pushes the shaft upward, so that the upper end of the shaft gradually inserts into the bearing inner ring.

[0036] As the shaft gradually moves upward, the upper end of the shaft gradually comes into contact with the lower end of the elastic telescopic rod 81. Then the shaft continues to move upward and pushes the elastic telescopic rod 81 to retract upward, thereby causing the elastic telescopic rod 81 to gradually disengage from the inner ring of the bearing. During the upward retraction of the elastic telescopic rod 81, the collar 84 gradually resets downward under the action of the spring 85, and drives multiple positioning rods 82 to gradually open outward.

[0037] After the shaft is fully inserted into the inner ring of the bearing, an interference fit is formed between the shaft and the bearing. At this time, the press fitting is completed, and the upper press 2 begins to move upward. During the upward movement of the upper press 2, the two semi-arc plates 51 move upward synchronously, and the upper ends of the two semi-arc plates 51 gradually come into contact with the guide slope at the lower end of the guide plate 61.

[0038] As the upper press 2 continues to rise, the guide ramp gradually pushes the two semi-arc plates 51 to rotate around their corresponding rotation axes, causing the two semi-arc plates 51 to move away from each other and gradually open. At the same time, the limiting plate 52 set on the inner side of the two semi-arc plates 51 gradually approaches the ring platform on the elastic telescopic rod 81. When the two semi-arc plates 51 open to the predetermined angle, the limiting plate 52 abuts against the lower end of the ring platform, thereby restricting the elastic telescopic rod 81 from moving downward. This prevents the elastic telescopic rod 81 from releasing rapidly after the top of the shaft separates from the abutment, causing the lower end of the elastic telescopic rod 81 to hit the newly installed bearing. Then the lower press 7 begins to reset downward.

[0039] Subsequently, the upper conveyor belt starts to rotate again. Since an opening facing the right has been formed between the two semi-arc plates 51, the installed bearing and shaft can move to the right along the opening formed between the two semi-arc plates 51 and disengage from between the two semi-arc plates 51. Since the shaft and bearing are interference fit, the shaft can move synchronously with the bearing during the movement.

[0040] After the bearings and shafts are removed after installation, the lower conveyor belt continues to rotate, moving the next shaft to be installed below the installation position. Simultaneously, the upper conveyor belt moves the next set of bearings to be installed to the installation position, thus entering the next assembly cycle.

[0041] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A shaft assembly device, comprising a frame (1), an upper press (2) mounted on the frame (1), and an upper conveying mechanism (3) for conveying bearings, characterized in that, Also includes: The lower conveying mechanism (4) is located below the upper conveying mechanism (3) and is used to convey the shaft; The press sleeve mechanism (5) includes two semi-arc plates (51) rotatably mounted on the lower end of the upper press (2). When the two semi-arc plates (51) are closed, they form a sleeve structure for abutting against the inner ring of the bearing. The guide mechanism (6) is set on the frame (1) and is used to push the two semi-arc plates (51) away from each other and open when the upper press (2) rises; The lower press (7) is located below the lower conveying mechanism (4), and the lower press (7) is used to push the shaft upward; When the bearing is delivered to the installation position, the two semi-arc plates (51) close together and abut against the upper end face of the bearing inner ring. The press (7) pushes the shaft upward so that the upper end of the shaft is inserted into the bearing inner ring to complete the press installation. After the pressing is completed, the upper press (2) drives the two semi-arc plates (51) to move upward. The two semi-arc plates (51) rotate around their respective rotation axes and open. Then the upper conveying mechanism (3) drives the bearing to move out along the opening formed between the two semi-arc plates (51).

2. The rotating shaft assembly device according to claim 1, characterized in that, The rotation axes of the two semi-arc plates (51) are respectively located at one end of the corresponding semi-arc plate (51) along the circumferential direction, and the rotation axes of the two semi-arc plates (51) are parallel to the axis of the semi-arc plate (51).

3. The rotating shaft assembly device according to claim 2, characterized in that, The guiding mechanism (6) includes a guide plate (61) fixedly installed on the frame (1). The lower end of the guide plate (61) is provided with two oppositely arranged guide slopes. When the upper press (2) drives the two semi-arc plates (51) to move upward, the upper ends of the two semi-arc plates (51) respectively abut against the corresponding guide slopes, thereby causing the two semi-arc plates (51) to rotate around their respective rotation axes and open.

4. A rotating shaft assembly device according to claim 3, characterized in that, A torsion spring is provided between each of the two semi-arc plates (51) and the upper press (2). The torsion spring is used to drive the two semi-arc plates (51) to move closer to each other and maintain a closed tendency.

5. A rotating shaft assembly device according to claim 1, characterized in that, The frame (1) is provided with a clearance groove, and the upper conveying mechanism (3) includes two upper conveyor belts located in the clearance groove, with a gap between the two upper conveyor belts for the shaft to pass through.

6. A rotating shaft assembly device according to claim 5, characterized in that, The lower conveying mechanism (4) includes a lower conveyor belt set on the frame (1). The lower conveyor belt has multiple through holes, and the shaft is inserted into the holes. The shaft has a ring platform for contacting the lower conveyor belt.

7. A rotating shaft assembly device according to claim 1, characterized in that, The upper press (2) is also provided with a positioning mechanism (8), which includes an elastic telescopic rod (81) coaxially arranged on the upper press (2). The elastic telescopic rod (81) is coaxially arranged with the sleeve formed by the two semi-arc plates (51), and the lower end of the elastic telescopic rod (81) extends beyond the lower end of the two semi-arc plates (51).

8. A rotating shaft assembly device according to claim 7, characterized in that, The lower end of the elastic telescopic rod (81) is hinged with multiple positioning rods (82), which are evenly distributed along the circumference of the elastic telescopic rod (81). A collar (84) is slidably sleeved on the elastic telescopic rod (81). A spring (85) is provided between the collar (84) and the elastic telescopic rod (81). A connecting rod (86) is hinged between the collar (84) and the positioning rods (82). The spring (85) is used to drive the collar (84) to reset and drive the multiple positioning rods (82) to maintain an opening trend. When the collar (84) moves along the elastic telescopic rod (81), the collar (84) drives the multiple positioning rods (82) to open or contract synchronously through the connecting rod (86).

9. A rotating shaft assembly device according to claim 8, characterized in that, Each of the multiple positioning rods (82) has a roller (83) rotatably mounted on one end away from the elastic telescopic rod (81). When the elastic telescopic rod (81) is inserted into the inner ring of the bearing, the multiple rollers (83) abut against the inner ring of the bearing and push the inner ring of the bearing to move horizontally during the retraction of the positioning rod (82) so that the inner ring of the bearing is coaxial with the elastic telescopic rod (81).

10. A rotating shaft assembly device according to claim 9, characterized in that, A limiting plate (52) is provided on the inner side of the semi-arc plate (51). When the two semi-arc plates (51) are opened, the limiting plate (52) abuts against the ring platform on the elastic telescopic rod (81) to restrict the elastic telescopic rod (81) from extending downward.

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