Floating tightening device

Abstract

The application discloses a floating tightening device, which is characterized in that a plurality of ball sets are clamped between a sliding ring and a floating ring, and the side of the sliding ring facing the floating ring is provided with a spherical surface for abutting against the ball sets, that is, the floating assembly is supported by a thrust ball bearing. In this way, when the floating tightening device is used for tightening operation, the tightening shaft assembly is connected to a target piece, and under the action of the target piece, the tightening shaft assembly and the floating assembly can move axially relative to the housing to realize axial movement compensation. Moreover, since the tightening shaft assembly is supported on the housing by the thrust ball bearing, the tightening shaft assembly can drive the floating ring to rotate and swing in any direction in a plane perpendicular to the tightening shaft assembly, so that the tightening shaft assembly can continuously move in any direction, achieving high-precision universal floating compensation, which is helpful to realize reliable automatic tightening operation.

Description

Technical Field

[0001] This application relates to the field of robotic arm technology, and in particular to a floating tightening device. Background Technology

[0002] During the construction of wind turbine units, pitch bearings or main shaft flanges need to be bolted together. Manually performing this work using heavy-duty hydraulic torque wrenches presents drawbacks such as high labor intensity, high safety risks, inconsistent tightening quality, and difficulty in tracking work data. Therefore, a tightening device can be mounted on a robotic arm, allowing for remote manual operation of the robotic arm to perform the tightening operation and record and store the operation data for later maintenance.

[0003] During bolt tightening, precise positioning based on the bolt's location is crucial to avoid damage. However, existing tightening devices suffer from drawbacks such as a lack of effective float compensation, limited float compensation direction, and low equipment rigidity. Furthermore, the torque of existing tightening devices is typically below 3000 Nm, with a float of 2-3 mm, making it difficult to meet the needs of larger-sized products. Summary of the Invention

[0004] The purpose of this application is to provide a floating tightening device that can provide automatic high-precision multi-directional floating compensation with a large floating amount, which helps to achieve reliable automated tightening operations.

[0005] To solve the above-mentioned technical problems, this application provides a floating tightening device, comprising: case; A tightening shaft assembly passes through the housing along its own axial direction. The tightening shaft assembly has a first end and a second end opposite to each other. The first end and the second end are respectively located outside the housing. The first end is used to connect to a power source, and the second end is used to connect to a target component. The floating assembly includes a floating ring, a sliding ring, and a plurality of ball bearing assemblies, all located within the housing. The floating ring is arranged around the outer periphery of the tightening shaft assembly, and the sliding ring is arranged around the outer periphery of the floating ring. The sliding ring has a spherical surface that is recessed away from the floating ring on one side facing the floating ring. The plurality of ball bearing assemblies are arranged at intervals around the tightening shaft assembly and sandwiched between the floating ring and the sliding ring, with the ball bearing assemblies abutting against the spherical surface.

[0006] The floating tightening device of this application includes multiple ball bearing sets sandwiched between a sliding ring and a floating ring. The sliding ring has a spherical surface on the side facing the floating ring to abut against the ball bearing sets; that is, the floating assembly is supported by a thrust ball bearing. Thus, when using the floating tightening device for tightening operations, the tightening shaft assembly connects to the target component. Under the action of the target component, the tightening shaft assembly and the floating assembly can move axially relative to the housing, achieving axial movement compensation. Furthermore, since the tightening shaft assembly is supported by the housing via the thrust ball bearing, it can drive the floating ring to rotate and oscillate in any direction within a plane perpendicular to the tightening shaft assembly. This allows the tightening shaft assembly to move continuously in any direction, achieving high-precision omnidirectional floating compensation, which helps to realize reliable automated tightening operations. Moreover, simulation calculations show that the floating tightening device of this application can achieve a floating amount of 8mm-10mm in any direction, meeting the needs of more application scenarios.

[0007] Optionally, the floating assembly further includes a plurality of ball seats, which are spaced apart around the outer periphery of the floating ring. Each ball seat has a groove, and the plurality of ball sets are correspondingly disposed in the plurality of grooves.

[0008] Optionally, the floating assembly further includes a plurality of ball bearing caps, which are arranged correspondingly to the ball bearing seat and located on the side of the sliding ring facing the floating ring. The ball bearing caps are provided with the spherical surface on the side of the floating ring facing the floating ring.

[0009] Optionally, the ball assembly includes a plurality of balls, which are arranged at axial intervals along the tightening shaft assembly.

[0010] Optionally, the floating tightening device further includes a plurality of telescopic components, which are arranged around the outer periphery of the tightening shaft assembly. One end of each telescopic component is connected to the inner wall of the housing, and the other end is connected to the sliding ring. The telescopic components are capable of extending and retracting along the axial direction of the tightening shaft assembly.

[0011] Optionally, the housing further includes a first flange, a second flange, and a side plate, all arranged around the outer periphery of the tightening shaft assembly. The first flange and the second flange are arranged axially spaced along the tightening shaft assembly. The side plate is connected between the first flange and the second flange. The sliding ring is located between the side plate and the floating ring. The floating tightening device further includes a mounting frame sleeved on the outside of the housing. The mounting frame is provided with a first rolling element group and a second rolling element group, both of which are rotatably arranged. The first rolling element group and the second rolling element group are arranged axially spaced along the tightening shaft. The first rolling element group is located on the side of the first flange away from the second flange, and the second rolling element group is located on the side of the second flange away from the first flange.

[0012] Optionally, the mounting frame may further include a rotatable third set of rolling elements, which are arranged around the outer periphery of the side plate and abut against the surface of the side plate opposite to the floating ring.

[0013] Optionally, the floating tightening device further includes a reaction arm, which is arranged around the tightening shaft assembly and fixed to the side of the housing near the second end. The reaction arm is used to cooperate with the second end to fix the housing.

[0014] Optionally, the floating tightening device further includes a mounting frame and a telescopic locking member. The mounting frame is sleeved on the outside of the housing. The housing is rotatably connected to the mounting frame with the axis of the tightening shaft assembly as the axis of rotation. The telescopic locking member is located on the side of the mounting frame near the first end. One end of the telescopic locking member is connected to the sliding ring, and the other end of the telescopic locking member is connected to the housing.

[0015] Optionally, the floating tightening device further includes a visual positioning mechanism, which is disposed in the housing and is used to identify the target part that is not tightened. And / or, the floating tightening device further includes a marking mechanism disposed in the housing, the marking mechanism being used to mark the target component that has been tightened.

[0016] The floating tightening device of this application has at least the following advantages over the prior art: The floating tightening device of this application, when used for tightening operations, connects the tightening shaft assembly to the target component. Under the action of the target component, the tightening shaft assembly and the floating assembly can move axially relative to the housing, achieving axial movement compensation. Furthermore, since the tightening shaft assembly is supported by the housing via thrust ball bearings, it can drive the floating ring to rotate and oscillate in any direction within a plane perpendicular to the tightening shaft assembly. This allows the tightening shaft assembly to move continuously in any direction, achieving high-precision omnidirectional floating compensation, which contributes to reliable automated tightening operations. Moreover, simulation calculations show that the floating tightening device of this application can achieve a floating amount of 8mm-10mm in any direction, meeting the needs of more application scenarios. Attached Figure Description

[0017] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0018] Figure 1 This is a schematic diagram of the floating tightening device in the embodiments of this application; Figure 2 yes Figure 1 A side view of the floating tightening device is shown; Figure 3 yes Figure 2 A cross-sectional schematic diagram of the floating tightening device is shown; Figure 4 yes Figure 3 Enlarged view of region A in the middle; Figure 5 yes Figure 1 The above diagram shows a top view of the floating tightening device; Figure 6 yes Figure 1 The above is a front view of the floating tightening device.

[0019] Explanation of reference numerals in the attached figures 1. Floating tightening device; 10. Housing; 10a. Opening; 100. First flange; 101. Second flange; 1010. Limiting seat; 1010a. Limiting groove; 102. Side plate; 1020. First guide; 103. First limiting pin; 11. Tightening shaft assembly; 11a. First end; 11b. Second end; 110. Tightening shaft; 1100. Spring; 111. Sleeve; 112. Sliding sleeve; 12. Floating assembly; 120. Floating ring; 121. Sliding ring; 121a. Spherical surface; 122. Ball assembly; 1220. Ball; 123. First shoulder flange; 124. Second shoulder flange; 125. Ball seat; 125a 126. Groove; 13. Ball bearing cap; 14. Telescopic assembly; 15. Reaction arm component; 16. Reaction arm sleeve; 17. Reaction arm; 18. Wear-resistant part; 19. Mounting frame; 10. First mounting plate; 10. Connecting shaft; 11. Second mounting plate; 12. Support plate; 13. Second limit pin; 14. First rolling element group; 15. Second rolling element group; 15. Third rolling element group; 16. Telescopic locking element; 17. Vision positioning mechanism; 18. Camera; 19. Light source; 10. Camera bracket; 11. Light source bracket; 12. Marking mechanism; 19. Nozzle; 10. Nozzle telescopic element; 11. Connecting element. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the various embodiments of this application will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been presented in the various embodiments of this application to facilitate a better understanding of the application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0021] In the embodiments of this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.

[0022] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0023] Furthermore, the terms "installation," "setup," "equipped with," "opening," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0024] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0025] In automated tightening operations, precise positioning of the object to be tightened is crucial. Simultaneously, the tightening process must adapt to potential positional changes, such as vibrations, to prevent damage caused by external forces. For example, when tightening bolts connecting a wheel hub and flange, combined radial and angular deviations can easily lead to thread pull-up or uneven preload. If this floating is not effectively compensated for, the workpiece will be damaged. The inventors attempted to use simple universal joints or spring floating joints for floating compensation, but these only achieve displacement compensation in limited directions and cannot adapt to multi-dimensional angular deviations, especially failing to meet the requirements of inclined wheel hub working surfaces. Furthermore, insufficient overall rigidity under high torque can easily cause vibration or decreased accuracy. The inventors also attempted to use a combination of cylinders and cam followers to give the tightening device some floating compensation capability, but this relies on line contact to transmit torque, making it prone to deformation or displacement under high loads, and posing a risk of single-point failure, resulting in low reliability and high maintenance costs.

[0026] To address the aforementioned technical problems, one embodiment of this application provides a floating tightening device. When using the floating tightening device for tightening operations, the tightening shaft assembly is connected to the target component. Under the action of the target component, the tightening shaft assembly and the floating assembly can move axially relative to the housing, achieving axial movement compensation. Furthermore, since the tightening shaft assembly is supported by the housing via a thrust ball bearing, it can drive the floating ring to rotate and oscillate in any direction within a plane perpendicular to the tightening shaft assembly. This allows the tightening shaft assembly to move continuously in any direction, achieving high-precision omnidirectional floating compensation, which helps to realize reliable automated tightening operations. Moreover, simulation calculations show that the floating tightening device of this application can achieve a floating amount of 8mm-10mm in any direction, meeting the needs of more application scenarios.

[0027] The following is a detailed description of the implementation details of the floating tightening device in this embodiment. The following content is only for the convenience of understanding and is not necessary for implementing this solution.

[0028] Please see also Figures 1 to 4 , Figure 1 This is a schematic diagram of the floating tightening device in the embodiments of this application. Figure 2 yes Figure 1 The side view of the floating tightening device shown is shown. Figure 3 yes Figure 2 The diagram shows a cross-sectional view of the floating tightening device. Figure 4 yes Figure 3 An enlarged schematic diagram of region A in the middle.

[0029] This application provides a floating tightening device 1, which includes a housing 10, a tightening shaft assembly 11, and a floating assembly 12. The tightening shaft assembly 11 is used to connect a target part, such as a bolt (not shown), and the floating assembly 12 is connected between the housing 10 and the tightening shaft assembly 11 to achieve multi-directional displacement compensation of the tightening shaft assembly 11.

[0030] The tightening shaft assembly 11 passes through the housing 10 along its own axial direction. The tightening shaft assembly 11 has a first end 11a and a second end 11b opposite to each other. The first end 11a and the second end 11b are located outside the housing 10, respectively. The first end 11a is used to connect to a power source, such as a robotic arm (not shown), and the second end 11b is used to connect to a target part, such as the bolt mentioned above.

[0031] The floating assembly 12 includes a floating ring 120, a sliding ring 121, and a plurality of ball bearing assemblies 122, all located within the housing 10. The floating ring 120 is arranged around the outer periphery of the tightening shaft assembly 11 and is fixedly connected to the tightening shaft assembly 11. The sliding ring 121 is arranged around the outer periphery of the floating ring 120, and a spherical surface 121a is provided on the side of the sliding ring 121 facing the floating ring 120. The spherical surface 121a is concave in the direction away from the floating ring 120. The plurality of ball bearing assemblies 122 are arranged circumferentially spaced around the tightening shaft assembly 11 and sandwiched between the floating ring 120 and the sliding ring 121, with the ball bearing assemblies 122 abutting against the spherical surface 121a. Thus, when the floating tightening device 1 is used for tightening operations, the tightening shaft assembly 11 is connected to the target component. Under the action of the target component, the tightening shaft assembly 11 and the floating assembly 12 can move axially relative to the housing 10, achieving axial movement compensation. Furthermore, since the tightening shaft assembly 11 is supported on the housing 10 by a thrust ball bearing, it can drive the floating ring 120 to rotate and swing in any direction within a plane perpendicular to the tightening shaft assembly 11. This allows the tightening shaft assembly 11 to move continuously in any direction, achieving high-precision omnidirectional floating compensation, which helps to realize reliable automated tightening operations. Moreover, simulation calculations show that the floating tightening device 1 can achieve a floating amount of 8mm-10mm in any direction, meeting the needs of more application scenarios.

[0032] It should be noted that the floating ring 120 is fixed to the outer periphery of the tightening shaft assembly 11. When the tightening shaft assembly 11 moves / rotates / oscillates, the floating ring 120 can be driven by the tightening shaft assembly 11 and move / rotate / oscillate synchronously.

[0033] In some embodiments, the housing 10 includes a first flange 100, a second flange 101, and a side plate 102. The first flange 100 and the second flange 101 are arranged axially spaced on opposite sides of the floating assembly 12 along the tightening shaft assembly 11. For example, the first flange 100 is disposed near the first end 11a, and the second flange 101 is disposed near the second end 11b. The side plate 102 is arranged around the outer periphery of the sliding ring 121 and is fixedly connected between the first flange 100 and the second flange 101. As can be seen, the first flange 100, the second flange 101, and the side plate 102 constitute a hollow housing 10, the floating assembly 12 is located inside the housing 10, and the tightening shaft assembly 11 passes through the housing 10.

[0034] It is understood that both the first flange 100 and the second flange 101 have openings 10a, the two openings 10a are arranged correspondingly and are distributed at intervals along the axial direction of the tightening shaft assembly 11, and the tightening shaft assembly 11 passes through the two openings 10a in sequence.

[0035] In some embodiments, the side plate 102 is an annular member that extends continuously along the circumference of the sliding ring 121, and the first flange 100 and the second flange 101 are respectively fixedly connected to opposite ends of the side plate 102 in the axial direction of the tightening shaft assembly 11. In this way, the overall sealing level of the housing 10 can be improved, preventing external dust and debris from entering the interior of the housing 10 and affecting the normal use of the floating assembly 12.

[0036] In other embodiments, the side plates 102 can be multiple plate-like components, arranged circumferentially around the sliding ring 121, with the ends of the multiple side plates 102 respectively fixedly connected to the first flange 100 and the second flange 101. In this way, the housing 10 can form multiple gaps. When using the floating tightening device 1 for tightening operations, the larger gaps help to transfer the heat generated by friction inside the floating tightening device 1 to the outside of the housing 10.

[0037] This application does not limit the specific shape, structure and setting method of the side plate 102. The specific setting scheme can be selected according to actual needs.

[0038] In some embodiments, the housing 10 is further provided with a first limiting pin 103 on its inner side. The first limiting pin 103 extends axially along the tightening shaft assembly 11, and the first limiting pin 103 and the sliding ring 121 are arranged opposite each other in the axial direction of the tightening shaft assembly 11. The first limiting pin 103 is used to limit the movement distance of the sliding ring 121 relative to the housing 10 in the axial direction of the tightening shaft assembly 11.

[0039] Specifically, the first limiting pin 103 is located on the side of the sliding ring 121 facing away from the second end 11b in the axial direction of the tightening shaft assembly 11, and the first limiting pin 103 and the sliding ring 121 are spaced apart in the axial direction of the tightening shaft assembly 11. With this configuration, the sliding ring 121 can move axially along the tightening shaft assembly 11 under the influence of the tightening shaft assembly 11 and the floating ring 120, but its movement distance is limited by the first limiting pin 103. That is, the axial floating compensation distance of the floating assembly 12 is constrained by the first limiting pin 103, which can prevent excessive axial displacement of the floating assembly 12. In practical applications, the distance between the first limiting pin 103 and the sliding ring 121 can be selected and set according to actual usage requirements.

[0040] In some embodiments, the tightening shaft assembly 11 includes a tightening shaft 110 and a sleeve 111. The tightening shaft 110 has the aforementioned first end 11a and second end 11b. The second end 11b of the tightening shaft 110 passes sequentially through the openings 10a of the first flange 100 and the second flange 101. The sleeve 111 is movably connected to the tightening shaft 110 along its axial direction and is used to connect to the target part. During the tightening operation, the tightening shaft 110 is driven to rotate about its own axis, which in turn drives the sleeve 111 to rotate, thereby causing the sleeve 111 to rotate the target part, thus completing the tightening operation.

[0041] In some embodiments, the tightening shaft 110 may integrate sensors (not shown), such as torque sensors, pressure sensors, encoders, etc., to record the pressure borne by the tightening shaft 110, the rotational speed of the tightening shaft 110, the number of rotations, etc., during the tightening process, to obtain complete tightening data, and to correlate the corresponding data with the specific type and specifications of the target part. In this way, when tightening the same type of target part later, the corresponding data can be retrieved before tightening, ensuring consistent tightening quality for different target parts of the same type and specification. Furthermore, if a fault occurs in the tightened target part later, the recorded data can be analyzed, i.e., data traceability, to determine whether the fault was caused by improper operation during tightening or substandard tightening parameters, thereby analyzing and determining the fault type.

[0042] In some embodiments, a portion of the sleeve 111 may be fitted onto a portion of the second end 11b of the tightening shaft 110, and the sleeve 111 is configured to be movable relative to the tightening shaft 110 along the axial direction of the tightening shaft 110, but not to rotate relative to the tightening shaft 110. The sleeve 111 is axially movable relative to the tightening shaft 110, and axial displacement compensation can also be achieved during the tightening operation.

[0043] In some embodiments, a spring 1100 may be provided on the outer periphery of the tightening shaft 110, with the opposite ends of the spring 1100 abutting against the tightening shaft 110 and the sleeve 111, respectively. Thus, during the tightening operation, the sleeve 111 moves under the action of the target component, compressing the spring 1100 and achieving axial displacement compensation. After being compressed, the spring 1100 applies a reaction force to the sleeve 111, ensuring a tight fit between the sleeve 111 and the target component, preventing slippage or even detachment. Furthermore, after the tightening operation is completed, the sleeve 111 separates from the target component, is no longer subject to external force, and the spring 1100 returns to its original state, driving the sleeve 111 to automatically reset.

[0044] In some embodiments, the tightening shaft assembly 11 further includes a sliding sleeve 112, which is slidably fitted onto the second end 11b of the tightening shaft 110 along the axial direction and is configured to be non-rotatable relative to the tightening shaft 110. The end of the sliding sleeve 112 facing away from the tightening shaft 110 is fixedly connected to a sleeve 111. Specifically, the sleeve 111 can be fastened to the tightening shaft 110 circumferentially by a plurality of spaced screws / bolts. Understandably, in this case, the opposite ends of the spring 1100 abut against the tightening shaft 110 and the sliding sleeve 112, respectively.

[0045] In some embodiments, the opposing ends of the sliding sleeve 112 and the sleeve 111 may also be provided with grooves and protrusions alternately arranged in the circumferential direction of the tightening shaft 110. This allows the protrusions of the sleeve 111 to engage with the grooves of the sliding sleeve 112, and vice versa, when the sleeve 111 and the sliding sleeve 112 are engaged. This configuration helps increase the torque that the sleeve 111 can transmit. Alternatively, when the tightening shaft 110 and the sleeve 111 are directly engaged, they can also be fastened with screws / bolts, or engaged with protrusions and grooves. These configurations significantly improve the torque transmitted by the tightening shaft assembly 11. Simulation calculations show that the floating tightening device 1 can provide a torque of over 5000 Nm, thus meeting the needs of various applications, such as the tightening operations of megawatt-class and larger wind turbine hubs.

[0046] In some embodiments, the floating assembly 12 further includes a first shoulder flange 123 and a second shoulder flange 124, both disposed around the outer periphery of the tightening shaft 110. The first shoulder flange 123 and the second shoulder flange 124 are arranged axially spaced along the tightening shaft assembly 11, and a floating ring 120 is connected between the first shoulder flange 123 and the second shoulder flange 124. In the radial direction of the tightening shaft 110, the size of the opening 10a is smaller than the size of both the first shoulder flange 123 and the second shoulder flange 124. Thus, due to the size limitation of the opening 10a, neither the first shoulder flange 123 nor the second shoulder flange 124 can move to the outside of the housing 10, thereby preventing the floating assembly 12 from moving from the opening 10a of the second flange 101 to the outside of the housing 10.

[0047] In some embodiments, the ball assembly 122 includes a plurality of balls 1220, which are spaced apart along the axial direction of the tightening shaft 110. This allows the plurality of balls 1220 to provide multi-point support along the axial direction of the tightening shaft 110, improving its stability, preventing it from wobbling, and avoiding situations where the tightening shaft 110 causes the sleeve 111 to wobble, resulting in kinking, twisting, or bending of the target component.

[0048] Optionally, there may be three, four, or more ball sets 122. For example, there may be six ball sets 122, which are arranged circumferentially spaced along the floating ring 120, such as in a rotationally symmetrical arrangement. Each ball set 122 includes two balls 1220, which are arranged axially spaced along the tightening shaft 110.

[0049] In this application, by setting the ball bearing 1220 and the spherical surface 121a of the sliding ring 121 to contact, the floating ring 120 can move relative to the sliding ring 121 in different directions. That is, during the tightening operation, when the tightening shaft 110 floats, the floating ring 120 can follow the tightening shaft 110 to move in different directions to achieve compensation, thereby enabling the floating tightening device 1 to achieve universal floating compensation.

[0050] See you again Figure 3 and Figure 4In some embodiments, the floating assembly 12 further includes a plurality of ball bearing seats 125, which are spaced apart around the outer periphery of the floating ring 120. Each ball bearing seat 125 has a groove 125a, and a plurality of balls 1220 are correspondingly disposed in the groove 125a. This arrangement allows the grooves 125a to limit the movement of the balls 1220, preventing the balls 1220 from disengaging from the floating ring 120 and the sliding ring 121 during floating adjustment, thus avoiding reduced floating compensation accuracy or even failure of the floating compensation function. Furthermore, using the ball bearing seats 125 to accommodate the balls 1220 prevents direct contact between the balls 1220 and the floating ring 120, thereby preventing wear on the floating ring 120 caused by the rolling of the balls 1220.

[0051] For example, there can be six ball bearing seats 125, which are arranged one-to-one with the six ball bearing groups 122. Each ball bearing seat 125 is provided with a plurality of grooves 125a arranged at intervals along the axial direction of the tightening shaft 110, such as two grooves 125a, so that two balls 1220 in each ball bearing group 122 are arranged corresponding to two grooves 125a.

[0052] Understandably, the opening of the groove 125a faces the sliding ring 121, and the depth of the groove 125a is less than the diameter of the ball 1220 to ensure that the ball 1220 can abut against the sliding ring 121. Of course, the width of the groove 125a, that is, the dimension of the groove 125a in the direction perpendicular to its own depth, should be greater than the diameter of the ball 1220 so that the ball 1220 can roll to achieve floating compensation during the tightening operation.

[0053] In some embodiments, at least a portion of the plurality of ball seats 125 may be constructed as an integral structure, that is, the ball seats 125 are configured as members that extend continuously in the circumference of the floating ring 120, and grooves 125a are provided on the ball seats 125 at intervals in the circumference of the floating ring 120.

[0054] In some embodiments, the floating assembly 12 further includes a plurality of ball bearing caps 126, which are disposed on the side of the sliding ring 121 facing the floating ring 120. Each ball bearing cap 126 has a corresponding spherical surface 121a on the side facing the floating ring 120. By providing ball bearing caps 126 on the inner side of the sliding ring 121 and providing spherical surfaces 121a on the side of the ball bearing caps 126 facing the floating ring 120 to abut against the balls 1220, direct contact between the balls 1220 and the sliding ring 121 can be avoided, thereby preventing wear of the sliding ring 121 caused by the rolling of the balls 1220.

[0055] In some embodiments, a plurality of ball bearing caps 126 are arranged in a one-to-one correspondence with a plurality of ball bearing seats 125. That is, the plurality of ball bearing caps 126 are arranged at intervals along the circumference of the sliding ring 121.

[0056] In some embodiments, the ball bearing cap 126 can be arranged in a one-to-one correspondence with a plurality of balls 1220. In this case, every two ball bearing caps 126 correspond to one ball bearing seat 125, and the two ball bearing caps 126 corresponding to one ball bearing seat 125 are arranged axially spaced on the tightening shaft 110.

[0057] Preferably, in the floating tightening device 1, the ball bearing seat 125 and the ball bearing cap 126 can be provided simultaneously.

[0058] In some embodiments, the floating tightening device 1 further includes a plurality of telescopic components 13 arranged around the outer periphery of the tightening shaft 110, with one end of each telescopic component 13 connected to the inner wall of the housing 10 and the other end connected to the sliding ring 121. The telescopic components 13 are capable of extending and retracting along the axial direction of the tightening shaft 110. Thus, when the floating ring 120 and the sliding ring 121 are driven by the axial movement of the tightening shaft 110, the telescopic components 13 can adapt to the movement of the sliding ring 121 and extend or retract accordingly. While ensuring the floating compensation of the tightening shaft 110, the stability of the floating ring 120 and the tightening shaft 110 can be improved by the multiple telescopic components 13, enabling the floating tightening device 1 to achieve continuous, stable, and precise floating compensation.

[0059] Understandably, one end of the telescopic assembly 13 is connected to the first flange 100, and the other end is connected to the sliding ring 121.

[0060] Optionally, the number of telescopic components 13 can be two, three, four, or more, depending on actual needs. In this embodiment, six telescopic components 13 are used as an example for illustration, but it is not intended to imply that the following content applies only to this example.

[0061] Optionally, the telescopic component 13 can be a pneumatic cylinder or a hydraulic cylinder. Before tightening, pressurization of the pneumatic or hydraulic cylinder can fix the sliding ring 121, thereby fixing the floating ring 120 and the tightening shaft 110, ensuring the tightening shaft 110 remains in a stable position and accurately aligns with the target part. After the tightening shaft 110 aligns with the target part, the pneumatic or hydraulic cylinder can be at least partially depressurized, allowing it to extend or retract to accommodate the floating of the floating ring 120.

[0062] Please see also Figure 5 and Figure 6 , Figure 5 yes Figure 1 The diagram shown is a top view of the floating tightening device. Figure 6 yesFigure 1 The above is a front view of the floating tightening device.

[0063] In some embodiments, the floating tightening device 1 further includes a reaction arm member 14, which is arranged around the outer periphery of the tightening shaft 110 and fixed to the side of the housing 10 near the second end 11b. The reaction arm member 14 is used to cooperate with the second end 11b to fix the position of the housing 10. Specifically, during the tightening operation, if the torque acting on the sleeve 111 by the target part is too large, it may cause the floating assembly 12 to rotate as a whole, thus preventing tightening. The reaction arm member 14 can provide a second connection fulcrum by engaging with the target part that has already been tightened, or other positions on the workpiece. In this way, during the tightening process, the reaction arm member 14 can withstand most of the torque and prevent the floating assembly 12 from rotating.

[0064] In some embodiments, the reaction arm component 14 includes a reaction arm sleeve 140 and a reaction arm 141. The reaction arm sleeve 140 is sleeved on the outer periphery of the tightening shaft 110 and is rotatable relative to the tightening shaft 110. The reaction arm 141 is fixedly connected to the side of the reaction arm sleeve 140 near the sleeve 111 and extends in the direction from the first shoulder flange 123 to the second shoulder flange 124. The end of the reaction arm 141 away from the second shoulder flange 124 is used to engage with the target part or workpiece to provide a second connection fulcrum. By making the reaction arm sleeve 140 rotatable, when the specific shape of the workpiece and / or the distribution of the target part changes, the position of the reaction arm 141 can be adjusted by rotating the reaction arm sleeve 140 so that the reaction arm 141 can engage with the target part or workpiece. Of course, after the reaction arm 141 engages with the target part or workpiece, the reaction arm sleeve 140 can be locked so that the reaction arm sleeve 140 cannot rotate relative to the tightening shaft 110 after locking, thus ensuring that the floating tightening device 1 remains stable throughout the tightening process. For example, the reaction arm 141 can be L-shaped.

[0065] Understandably, when the reaction arm sleeve 140 is fitted onto the outer periphery of the tightening shaft 110, a limiting seat 1010 surrounding the tightening shaft 110 can be fixedly installed on the side of the second flange 101 facing the second end 11b. The limiting seat 1010 has a limiting groove 1010a surrounding the tightening shaft 110, and the reaction arm sleeve 140 is arranged around the limiting seat 1010 and located in the limiting groove 1010a. In this way, the axial position of the reaction arm sleeve 140 on the tightening shaft 110 can be limited by the limiting seat 1010, and the reaction arm sleeve 140 can rotate relative to the tightening shaft 110.

[0066] In some embodiments, a rotary bearing (not shown) may be provided between the limiting seat 1010 and the reaction arm sleeve 140 to reduce the frictional resistance between them. Alternatively, grease may be provided between the limiting seat 1010 and the reaction arm sleeve 140 to reduce the frictional force between them. Or, both a rotary bearing and grease may be provided simultaneously.

[0067] In some embodiments, the reaction arm component 14 further includes a wear-resistant component 142, which is fixed to the end of the reaction arm 141 away from the second shoulder flange 124. The wear-resistant component 142 has high hardness and wear resistance, which can extend the service life of the reaction arm component 14.

[0068] In some embodiments, the floating tightening device 1 further includes a mounting frame 15 and a telescopic locking member 16. The mounting frame 15 is sleeved on the outside of the housing 10, and the housing 10 is rotatably connected to the mounting frame 15 about the axis of the tightening shaft 110. The telescopic locking member 16 is located on the side of the mounting frame 15 near the first end 11a, with one end of the telescopic locking member 16 connected to the housing 10 and the other end connected to the mounting frame 15. When the telescopic locking member 16 extends or retracts, it can drive the floating assembly 12 and the reaction arm member 14 to rotate as a whole. When the reaction arm member 14 is rotated to the appropriate position by the telescopic locking member 16, the telescopic locking member 16 can be locked, so that the reaction arm member 14 remains in a stable position. In addition, through the cooperation of the reaction arm member 14 and the telescopic locking member 16, most of the reaction torque generated during the tightening process acts on the reaction arm member 14, which can significantly improve the stability and reliability of the floating tightening device 1 during the tightening process.

[0069] Of course, the telescopic locking element 16 can also be provided on the side of the mounting frame 15 away from the reaction arm member 14. Alternatively, corresponding telescopic locking elements 16 can be provided on opposite sides of the mounting frame 15 in the axial direction of the tightening shaft 110.

[0070] It is understood that the two ends of the telescopic locking member 16 are respectively hinged to the second flange 101 and the mounting frame 15. The telescopic locking member 16 can be a pneumatic cylinder, a hydraulic cylinder, or an electric cylinder.

[0071] In some embodiments, the mounting frame 15 includes a first mounting plate 150, a second mounting plate 151, and a support plate 152 connected between the first mounting plate 150 and the second mounting plate 151. The first mounting plate 150 and the second mounting plate 151 are located on opposite sides of the housing 10 in the axial direction of the tightening shaft 110, i.e., the first flange 100 and the second flange 101 are located between the first mounting plate 150 and the second mounting plate 151. The support plate 152 is arranged around the outer periphery of the side plate 102. The support plate 152 can be an integral component, enclosing and connecting the first mounting plate 150 and the second mounting plate 151; alternatively, there can be multiple support plates 152, arranged at intervals around the outer periphery of the housing 10, and connected between the first mounting plate 150 and the second mounting plate 151.

[0072] It is understandable that the end of the telescopic locking member 16 connected to the mounting frame 15 can be connected to the first mounting plate 150 or the support plate 152.

[0073] In some embodiments, a second limiting pin 153 extending radially along the tightening shaft 110 may be provided on the first mounting plate 150 and / or the second mounting plate 151. The second limiting pin 153 is used to limit the rotational stroke of the floating assembly 12 to prevent the rotational stroke of the floating assembly 12 from exceeding the maximum stroke of the telescopic locking member 16 and causing damage to the telescopic locking member. The rotational stroke of the floating assembly 12 refers to the stroke of the floating assembly 12 rotating about the axis of rotation of the tightening shaft 110.

[0074] For example, a second limiting pin 153 can be provided on the side of the second mounting plate 151 facing the reaction arm member 14. The second limiting pin 153 extends radially along the tightening shaft 110 to be opposite the second flange 101. Specifically, the second limiting pin 153 can be configured such that, during the extension of the telescopic locking member 16 and the rotation of the floating assembly 12, when the telescopic locking member 16 is about to reach or has just reached its maximum stroke, the end of the telescopic locking member 16 connecting to the second flange 101 abuts against the second limiting pin 153, preventing the floating assembly 12 from continuing to rotate, thereby ensuring that the rotational stroke of the floating assembly 12 does not exceed the maximum stroke of the telescopic locking member 16.

[0075] Another example is that a limiting block (not shown) can be provided on the side of the second flange 101 facing the reaction arm member 14. During the process of the telescopic locking member 16 extending and driving the floating assembly 12 to rotate, when the telescopic locking member 16 is about to reach or just reaches its maximum stroke, the end of the telescopic locking member 16 connected to the second flange 101 abuts against the limiting block, so that the floating assembly 12 cannot continue to rotate, thereby ensuring that the rotation stroke of the floating assembly 12 does not exceed the maximum stroke of the telescopic locking member 16.

[0076] It should be understood that, regardless of whether the second limiting pin 153 restricts the rotational travel of the floating assembly 12 by abutting against the telescopic locking member 16 or the limiting block, the restriction of the travel of the floating assembly 12 by the second limiting pin 153 can be adjusted according to actual needs. For example, the rotational travel of the floating assembly 12 can be limited to one-quarter, one-third, one-half or other ratios of the maximum travel of the telescopic locking member 16, and this embodiment does not specifically limit this.

[0077] In other embodiments, the second limiting pin 153 may be disposed on the side of the first mounting plate 150 opposite to the second mounting plate 151. Alternatively, both the first mounting plate 150 and the second mounting plate 151 may be provided with the second limiting pin 153.

[0078] In some embodiments, the housing 10 is further provided with a rotatable first rolling element group 154 ​​and a second rolling element group 155, which are arranged axially spaced along the tightening shaft assembly 11 and located on opposite sides of the floating assembly 12 in the axial direction of the tightening shaft 110. For example, the first rolling element group 154 ​​is located on the side of the first flange 100 opposite to the second flange 101, and the second rolling element group 155 is located on the side of the second flange 101 opposite to the first flange 100. The first rolling element group 154 ​​and the second rolling element group 155 are used to limit the floating assembly 12 in the axial direction of the tightening shaft assembly 11 to prevent the floating assembly 12 from detaching from the housing.

[0079] Specifically, the first rolling element group 154 ​​and the second rolling element group 155 are respectively disposed on the opposite side of the first mounting plate 150 and the second mounting plate 151, and the first rolling element group 154 ​​can be arranged opposite to the second flange 101. When the second flange 101 moves along the axial direction of the tightening shaft 110 to abut against the first rolling element group 154 ​​or the second rolling element group 155, the second flange 101 cannot continue to move in the original direction of movement.

[0080] Understandably, the first rolling element group 154 ​​and the second rolling element group 155 constrain the axial position of the floating assembly 12 on the tightening shaft 110 by limiting the axial position of the first flange 100 and the second flange 101 on the tightening shaft 110.

[0081] It should be noted that the first rolling element group 154 ​​and the second rolling element group 155 are configured to be rotatable. Specifically, when the first rolling element group 154 ​​contacts the first flange 100 and the first flange 100 rotates, the first rolling element group 154 ​​can roll on the surface of the first flange 100; or, when the second rolling element group 155 contacts the second flange 101 and the second flange 101 rotates, the second rolling element group 155 can roll on the surface of the second flange 101. In this way, the impact of the first rolling element group 154 ​​and the second rolling element group 155 on the housing 10 can be reduced, and the impact on the floating compensation of the floating assembly 12 in the circumferential direction of the tightening shaft assembly 11 can be avoided.

[0082] In some embodiments, both the first rolling element group 154 ​​and the second rolling element group 155 are roller groups, that is, both the first rolling element group 154 ​​and the second rolling element group 155 include a plurality of rollers. The rollers of the first rolling element group 154 ​​are arranged circumferentially on the first flange 100 along the tightening shaft assembly 11, and the rollers of the second rolling element group 155 are arranged circumferentially on the second flange 101 along the tightening shaft assembly 11. The rotation axes of all rollers extend radially along the tightening shaft assembly 11, that is, the rotation axes of all rollers are perpendicular to the axis of the tightening shaft assembly 11.

[0083] In some embodiments, at least one rotary bearing (not shown) may be provided between the housing 10 and the mounting frame 15, allowing the housing 10 to rotate relative to the mounting frame 15. For example, the rotary bearing may be fitted around the outer periphery of the side plate 102.

[0084] In other embodiments, the housing 10 is further provided with a rotatable third rolling element group 156, which is arranged around the outer periphery of the side plate 102 and abuts against the surface of the side plate 102 opposite to the floating ring 120. The third rolling element group 156 is used to limit and constrain the side plate 102 in the radial direction, thereby limiting the floating assembly 12.

[0085] Optionally, the third rolling element group 156 can be disposed on the first flange 100, or the third rolling element group 156 can be disposed on the second flange 101, or both the first flange 100 and the second flange 101 are provided with the third rolling element group 156. In this embodiment, the example of both the first flange 100 and the second flange 101 being provided with the third rolling element group 156 is used for illustration, but it is not to be assumed that the following content applies only to this example.

[0086] In some embodiments, the third rolling element group 156 includes a plurality of rollers arranged at intervals around the outer periphery of the sliding ring 121, and all rollers are rotatably in contact with the surface of the side plate 102. That is, the rotation axes of all rollers are parallel to the axis of the side plate 102.

[0087] In some embodiments, the first mounting plate 150 is also used to connect a robotic arm (not shown), which drives the mounting frame 15 to move the floating assembly 12, thereby achieving automated tightening operations. Specifically, a connecting shaft 1500 may be provided on the first mounting plate 150 for connecting to the robotic arm, for example, it may be fixedly connected to the end flange of a six-axis industrial robot.

[0088] In some embodiments, the floating tightening device 1 further includes a vision positioning mechanism 17, which is mounted on the mounting frame 15 and connected to the housing 10 via the mounting frame 15. The vision positioning mechanism 17 is used to identify the target part. During tightening operations, the vision positioning mechanism 17 can first identify the target part, confirm its specific position, and guide the movement of the robotic arm so that the sleeve 111 can accurately align with the target part.

[0089] In some embodiments, the visual positioning mechanism 17 can acquire visual information of target parts that have completed tightening operations and those that have not, and determine the position of the target parts that have not been tightened through the system in order to guide the movement of the robotic arm.

[0090] In some embodiments, the visual positioning mechanism 17 includes a camera 170 and a light source 171, both of which are fixed to the mounting frame 15. The camera 170 and the light source 171 may be fixed to a second mounting plate 151 or a support plate 152, or one of the camera 170 and the light source 171 may be fixed to the second mounting plate 151 and the other to the support plate 152. The camera 170 is used to acquire relevant information about the target object, and the light source 171 is used to provide illumination to the camera 170, enabling the camera 170 to acquire the necessary information even in low-light environments.

[0091] Understandably, the camera 170 can be fixedly connected to the mounting frame 15 via the camera bracket 172, while the light source 171 can be fixedly connected to the mounting frame 15 via the light source bracket 173.

[0092] In some embodiments, the floating tightening device 1 further includes a marking mechanism 18, which is mounted on the mounting frame 15 and connected to the housing 10 via the mounting frame 15. The marking mechanism 18 is used to mark target parts that have been tightened. Specifically, when a target part is tightened, the marking mechanism 18 can form a preset pattern on the target part or workpiece corresponding to the position of the target part to indicate that the target part has been tightened. In this embodiment, the shape, size, color, etc., of the pattern formed by the marking mechanism 18 are not specifically limited.

[0093] In some embodiments, the marking mechanism 18 includes a nozzle 180 disposed on the mounting frame 15. The nozzle 180 is capable of spraying dye onto the target part that has been tightened, so that the dye forms a preset pattern on the target part or workpiece at the position corresponding to the target part.

[0094] In some embodiments, the marking mechanism 18 further includes a nozzle telescopic member 181, which is disposed on the mounting frame 15. The nozzle 180 is connected to the nozzle telescopic member 181, and the nozzle 180 is driven to move closer to or away from the target through the nozzle telescopic member 181.

[0095] In some embodiments, the marking mechanism 18 may further include a connector 182, which is connected between the nozzle 180 and the nozzle telescopic member 181 to provide installation space for the nozzle 180.

[0096] Understandably, the nozzle telescopic component 181 can be a pneumatic cylinder, an electric cylinder, a hydraulic cylinder, or a motor. When the nozzle telescopic component 181 is a motor, the connecting component 182 can be composed of a screw (not shown) and a slider (not shown) threaded to the outer periphery of the screw. The screw is coaxially and fixedly connected to the output shaft of the motor, and the slider is set to not rotate with the screw. The nozzle 180 is mounted on the slider.

[0097] In some embodiments, a solenoid valve 19 may be provided on the mounting frame 15. The solenoid valve 19 is connected to at least one of the telescopic assembly 13, the telescopic locking member 16, and the nozzle telescopic member 181, and is used to control the operation of at least one of the telescopic assembly 13, the telescopic locking member 16, and the nozzle telescopic member 181.

[0098] Of course, multiple solenoid valves 19 can be configured, and multiple solenoid valves are connected to the telescopic assembly 13, the telescopic locking member 16 and the nozzle telescopic member 181 respectively to control the operation of the telescopic assembly 13, the telescopic locking member 16 and the nozzle telescopic member 181 respectively.

[0099] It is understood that in this embodiment, the sensors, cameras, etc. in the tightening shaft 110 can be electrically or communicatively connected to a control device (not shown), such as a computer. Taking a computer as an example, the computer can acquire and store the data collected by the sensors and cameras, and can also control the robotic arm and the power source that drives the tightening shaft 110 to rotate based on this data.

[0100] To more clearly describe the floating tightening device 1 of this embodiment, the process of using the floating tightening device 1 for tightening operations will be described in detail below.

[0101] In summary, the entire tightening operation includes a cap identification stage and a tightening stage. The cap identification stage primarily involves identifying and locating the target component (such as a bolt or nut) to be tightened, and engaging the sleeve 111 with the target component after identification. After cap identification, the tightening stage begins. At this stage, the telescopic locking member 16 moves the reaction arm member 14 to the anti-torque working position and locks it in place. Then, the power source drives the tightening shaft assembly 11 to perform the tightening operation. After tightening is complete, the telescopic locking member 16 is released, and the telescopic assembly 13 drives the floating assembly 12 to reset. For a more detailed workflow, please refer to the following text.

[0102] First, the position of the target part to be tightened is determined by the visual positioning mechanism 17. The operator can control the robotic arm according to the determined position, or the control device can automatically control it so that the robotic arm drives the floating tightening device 1 to move to the target part to be tightened and the sleeve 111 is fitted onto the outer periphery of the target part.

[0103] It should be noted that during the docking process between the sleeve 111 and the target part, the telescopic assembly 13 should be in a pressurized state. The telescopic assembly 13 can keep the positions of the floating assembly 12 and the tightening shaft 110 stable, ensuring that the sleeve 111 can accurately fit onto the target part. Furthermore, after the sleeve 111 accurately fits onto the target part, the telescopic assembly 13 is depressurized. Thus, when the floating assembly 12 compensates for the float according to the target part, the telescopic assembly 13 extends and retracts to adapt to the movement of the tightening shaft 110 and the sliding ring 121.

[0104] Secondly, the reaction arm component 14 is driven to rotate by the telescopic locking component 16 until the wear-resistant component 142 is fixed to other positions of the target component or workpiece that has been tightened. Then the telescopic locking component 16 is locked to fix the position of the wear-resistant component 142.

[0105] Next, the tightening shaft 110 is driven to rotate by a power source to tighten the target part. During the tightening process, the telescopic assembly 13 remains in a depressurized state.

[0106] Finally, after tightening is completed, the power source stops driving the tightening shaft 110. Then, the robotic arm moves the floating tightening device 1 away from the target part, and the marking mechanism 18 marks the target part that has been tightened. At the same time, the telescopic assembly 13 pressurizes, driving the floating assembly 12 and the tightening shaft 110 to reset.

[0107] The floating tightening device 1 of this embodiment, through the drive compensation structure formed by the floating assembly 12 and multiple telescopic components 13, can compensate for the problems of uneven thread pull-up or preload caused by the combined deviations of displacement and angle in various directions during wheel hub bolt assembly. Specifically, the thrust ball bearing provides angular floating during multi-dimensional floating compensation, and the multiple telescopic components 13 provide radial displacement floating. Based on the multiple telescopic components 13, combined with the axial guidance between the floating assembly 12 and the housing 10, rapid centering and precise reset can be achieved. The floating tightening device 1 can also be used in conjunction with control devices such as sensors to improve the level of automation and the recording and traceability of work data, enabling rapid identification of fault types and causes and facilitating maintenance. Furthermore, the floating tightening device 1 of this embodiment can also achieve omnidirectional displacement compensation with large torque and large floating amount.

[0108] The floating tightening device provided by the embodiments of this application has been described in detail above. Specific examples have been used in this document to illustrate the principle and implementation of this application. The description of the above embodiments is only for the purpose of helping to understand the idea of ​​this application. There may be changes in the specific implementation and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A floating tightening device, characterized in that, include: case; A tightening shaft assembly passes through the housing along its own axial direction. The tightening shaft assembly has a first end and a second end opposite to each other. The first end and the second end are respectively located outside the housing. The first end is used to connect to a power source, and the second end is used to connect to a target component. The floating assembly includes a floating ring, a sliding ring, and a plurality of ball bearing assemblies, all located within the housing. The floating ring is arranged around the outer periphery of the tightening shaft assembly, and the sliding ring is arranged around the outer periphery of the floating ring. The sliding ring has a spherical surface that is recessed away from the floating ring on one side facing the floating ring. The plurality of ball bearing assemblies are arranged at intervals around the tightening shaft assembly and sandwiched between the floating ring and the sliding ring, with the ball bearing assemblies abutting against the spherical surface.

2. The floating tightening device according to claim 1, characterized in that, The floating assembly also includes a plurality of ball seats, which are spaced apart around the outer periphery of the floating ring. Each ball seat has a groove, and the plurality of ball sets are correspondingly disposed in the plurality of grooves.

3. The floating tightening device according to claim 2, characterized in that, The floating assembly also includes multiple ball bearing caps, which are arranged correspondingly to the ball bearing seats and located on the side of the sliding ring facing the floating ring. The multiple ball bearing caps have spherical surfaces on the side facing the floating ring.

4. The floating tightening device according to any one of claims 1-3, characterized in that, The ball assembly includes a plurality of balls, which are arranged at axial intervals along the tightening shaft assembly.

5. The floating tightening device according to claim 1, characterized in that, The floating tightening device also includes multiple telescopic components, which are arranged around the outer periphery of the tightening shaft assembly. One end of each telescopic component is connected to the inner wall of the housing, and the other end is connected to the sliding ring. The telescopic components are capable of extending and retracting along the axial direction of the tightening shaft assembly.

6. The floating tightening device according to claim 1, characterized in that, The housing further includes a first flange, a second flange, and a side plate, all arranged around the outer periphery of the tightening shaft assembly. The first flange and the second flange are arranged axially spaced along the tightening shaft assembly. The side plate is connected between the first flange and the second flange. The sliding ring is located between the side plate and the floating ring. The floating tightening device further includes a mounting frame sleeved on the outside of the housing. The mounting frame is provided with a first rolling element group and a second rolling element group, both of which are rotatably arranged. The first rolling element group and the second rolling element group are arranged axially spaced along the tightening shaft. The first rolling element group is located on the side of the first flange away from the second flange, and the second rolling element group is located on the side of the second flange away from the first flange.

7. The floating tightening device according to claim 6, characterized in that, The mounting frame is further provided with a rotatable third rolling element group, which is arranged around the outer periphery of the side plate and abuts against the surface of the side plate opposite to the floating ring.

8. The floating tightening device according to claim 1, characterized in that, The floating tightening device further includes a reaction arm, which is arranged around the tightening shaft assembly and fixed to the side of the housing near the second end. The reaction arm is used to cooperate with the second end to fix the housing.

9. The floating tightening device according to claim 8, characterized in that, The floating tightening device further includes a mounting frame and a telescopic locking member. The mounting frame is sleeved on the outside of the housing. The housing is rotatably connected to the mounting frame with the axis of the tightening shaft assembly as the axis of rotation. The telescopic locking member is located on the side of the mounting frame near the first end. One end of the telescopic locking member is connected to the sliding ring, and the other end of the telescopic locking member is connected to the housing.

10. The floating tightening device according to claim 1, characterized in that, The floating tightening device also includes a visual positioning mechanism, which is located in the housing and is used to identify the target part that is not tightened. And / or, the floating tightening device further includes a marking mechanism disposed in the housing, the marking mechanism being used to mark the target component that has been tightened.

Images