A connecting fastening device

Abstract

The present application relates to the technical field of fastener, in particular to a connecting fastening device. The device comprises a hydraulic drive mechanism and an adapter sleeve; the hydraulic drive mechanism comprises a hydraulic motor; one end of the adapter sleeve is connected with the hydraulic motor, and the other end is connected with a threaded fastener; the hydraulic motor is used to drive the adapter sleeve to rotate towards the locking direction of the threaded fastener, so as to apply a pre-tightening torque to the threaded fastener. The connecting fastening device provided by the present application is used in the following way: the hydraulic motor drives the adapter sleeve to rotate towards the locking direction of the threaded fastener, so as to apply a pre-tightening torque to the threaded fastener, thereby keeping the pre-tightening force of the threaded fastener within a set range. In addition, when the threaded fastener reversely drives the adapter sleeve to rotate due to loosening tendency, the hydraulic motor generates a hydraulic torque resisting the reverse rotation in the un-unloaded hydraulic oil circuit, so as to form a damping effect of inhibiting the relative sliding of the threaded fastener.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fastener, in particular to a connecting fastening device. BACKGROUND

[0002] Threaded fastener is a mechanical element that realizes detachable connection or fixing function through thread structure. Its core working principle is to convert the applied rotary torque into axial pre-tightening force by utilizing the screw transmission characteristics of internal and external threads, and to realize reliable connection of multiple components by relying on the friction resistance generated on the contact surface of the threaded pair and the connected parts.

[0003] In order to prevent the threaded fastener from loosening during use, a passive anti-loosening mechanism is usually adopted during the fastening process. The passive anti-loosening mechanism mainly realizes mechanical locking, increases friction or material deformation through the structure of the threaded fastener itself or accessories (such as spring washers, lock nuts and split pins), so as to inhibit the rotation tendency of the threaded fastener.

[0004] However, since the passive anti-loosening mechanism itself does not generate or maintain pre-tightening force, the threaded fastener is prone to micro-amplitude relative slip under the action of continuous high-frequency vibration or alternating impact load, which further causes the pre-tightening force of the threaded fastener to gradually decay, thereby affecting the reliability of the connection and the stability of the equipment operation. SUMMARY

[0005] The present application provides a connecting fastening device to solve the problem that the threaded fastener is prone to micro-amplitude relative slip under the action of continuous high-frequency vibration or alternating impact load due to the passive anti-loosening mechanism itself not generating or maintaining pre-tightening force, which further causes the pre-tightening force of the threaded fastener to gradually decay.

[0006] In order to solve the above technical problems, the technical scheme provided by the present application is as follows:

[0007] A connecting fastening device:

[0008] The connecting fastening device comprises a hydraulic drive mechanism and an adapter sleeve. The hydraulic drive mechanism comprises a hydraulic motor. One end of the adapter sleeve is connected with the hydraulic motor, and the other end is connected with the threaded fastener. The hydraulic motor is used to drive the adapter sleeve to rotate towards the locking direction of the threaded fastener, so as to apply a pre-tightening torque to the threaded fastener. When the threaded fastener is driven to rotate in the opposite direction due to loosening tendency, the hydraulic motor generates a hydraulic torque in the unloading hydraulic oil circuit to resist the reverse rotation, so as to form a damping effect to inhibit the relative slip of the threaded fastener.

[0009] Furthermore, the hydraulic drive mechanism further comprises a torque control structure. The torque control structure comprises an electromagnetic clutch. The electromagnetic clutch is arranged in series between the hydraulic motor and the adapter sleeve.

[0010] Further, the torque regulating structure further comprises a torque sensor; the torque sensor is arranged in series between the electromagnetic clutch and the adapter sleeve, and is used to detect the transmission torque between the electromagnetic clutch and the adapter sleeve.

[0011] Further, the electromagnetic clutch is configured to: when the torque sensor detects that the transmission torque exceeds an upper threshold b, the friction pair enters a slip control state to transmit part of the torque; when the torque sensor detects that the transmission torque is lower than a lower threshold a, the friction pair returns to a full engagement state; the lower threshold is less than the upper threshold, so as to form a hysteresis interval E∈(a, b) to prevent frequent switching.

[0012] Further, a plurality of the adapter sleeves are further included; the hydraulic drive mechanism further comprises a synchronous transmission structure; a plurality of the adapter sleeves are respectively connected with different threaded fasteners; the hydraulic motor drives a plurality of the adapter sleeves to rotate in the same direction through the synchronous transmission structure, so as to simultaneously apply a pre-tightening torque to a plurality of the threaded fasteners.

[0013] Further, a plurality of the torque regulating structures are further included; an input end of the synchronous transmission structure is connected with the hydraulic motor, a plurality of output ends of the synchronous transmission structure are respectively connected with a plurality of the electromagnetic clutches in one-to-one correspondence; a plurality of the torque sensors are arranged in series between the corresponding electromagnetic clutches and the adapter sleeves.

[0014] Further, when at least two of the plurality of the torque sensors respectively detect that the transmission torque is in the hysteresis interval E∈(a, b) and reaches the lower threshold a: the electromagnetic clutch connected with the torque sensor detecting that the transmission torque is in the hysteresis interval E∈(a, b) enters the slip control state to transmit part of the torque; the electromagnetic clutch connected with the torque sensor detecting that the transmission torque reaches the lower threshold a returns to the full engagement state.

[0015] Further, the electromagnetic clutch is further configured to: when a plurality of the adapter sleeves are respectively and positionally installed with a plurality of the threaded fasteners, the friction pair is in a disengaged state, so that a plurality of the adapter sleeves can rotate independently.

[0016] Further, the synchronous transmission structure comprises a driving gear and a plurality of follower gears.

[0017] The driving gear is connected with an output end of the hydraulic motor; a plurality of the follower gears are respectively connected with a plurality of the electromagnetic clutches away from the torque sensors, and are all engaged with the driving gear.

[0018] Further, the synchronous transmission structure further comprises a synchronous support; the driving gear and the plurality of the follow-up gears are rotatably installed on the synchronous support.

[0019] In summary, the technical effects achieved by the present application are as follows:

[0020] 1. The connection fastening device provided by the present application drives the adaptive sleeve to rotate towards the locking direction of the threaded fastener by the hydraulic motor to apply a pre-tightening torque to the threaded fastener, so that the pre-tightening force of the threaded fastener is maintained within a set range.

[0021] In addition, when the threaded fastener is driven to rotate in the opposite direction due to the loosening tendency, the hydraulic motor generates a hydraulic torque in the un-unloaded hydraulic oil circuit to resist the reverse rotation, thereby forming a damping effect to inhibit the relative slip of the threaded fastener.

[0022] 2. The connection fastening device provided by the present application configures the electromagnetic clutch to enter a slip control state when the torque sensor detects that the transmission torque exceeds the upper threshold b, so as to avoid overloading damage of the threaded fastener.

[0023] During this process, the electromagnetic clutch in the slip control state consumes part of the reverse stress generated by the loosening tendency of the threaded fastener, and the remaining reverse stress is offset by the pre-tightening force of the threaded fastener itself, which is used to reduce the relative slip amplitude of the threaded fastener.

[0024] When the torque sensor detects that the transmission torque is lower than the lower threshold a, the friction pair of the electromagnetic clutch returns to the fully engaged state, so that the adaptive sleeve applies a pre-tightening torque to the threaded fastener, thereby restoring the pre-tightening force of the threaded fastener, so as to avoid loosening of the threaded fastener caused by subsequent impact.

[0025] 3. The connection fastening device provided by the present application drives a plurality of adaptive sleeves to rotate in the same direction through a synchronous transmission structure, and a plurality of adaptive sleeves apply pre-tightening torques to a plurality of threaded fasteners respectively, so as to realize synchronous pre-tightening of a plurality of threaded fasteners, thereby adapting to the connection scene of multiple threaded fasteners.

[0026] 4. The connection fastening device provided by the present application is configured to detect and control the torque of a plurality of threaded fasteners by connecting a plurality of torque regulating structures in series between the synchronous transmission structure and the plurality of adaptive sleeves, thereby adapting to the scene where a plurality of threaded fasteners need to maintain different pre-tightening forces.

[0027] 5. The connecting fastening device provided by the application, by configuring the electromagnetic clutch as: when different torque sensors respectively detect that the transmission torque is in the hysteresis interval E∈(a, b) and reaches the lower threshold a, the electromagnetic clutch connected with the torque sensor detecting that the transmission torque is in the hysteresis interval E∈(a, b) enters the slip control state to transmit part of the torque, so that the torque sensor slides relative to the output end of the synchronous transmission structure; and the electromagnetic clutch connected with the torque sensor detecting that the transmission torque reaches the lower threshold a restores the full engagement state to make the synchronous transmission structure only drive the torque sensor sensing shaft rotating when the transmission torque reaches the lower threshold a, and then restore the pre-tightening force of the threaded fastener through the adapter sleeve, thereby dynamically responding to the loosening trend of multiple threaded fasteners. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the specific embodiments or related art, the drawings needed to be used in the specific embodiments or related art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0029] Figure 1 The structural schematic diagram of the connecting fastening device provided by the embodiment of the application;

[0030] Figure 2 The front view of the connecting fastening device provided by the embodiment of the application;

[0031] Figure 3 The right view of the connecting fastening device provided by the embodiment of the application;

[0032] Figure 4 The bottom view of the connecting fastening device provided by the embodiment of the application;

[0033] Figure 5 The sectional view of the connecting fastening device provided by the embodiment of the application.

[0034] Figure:

[0035] 100-hydraulic drive mechanism; 110-hydraulic motor; 120-torque control structure; 121-electromagnetic clutch; 122-torque sensor; 130-synchronous transmission structure; 131-driving gear; 132-follower gear; 133-synchronous support; 134-driving shaft; 135-follower shaft; 136-bear with seat; 137-serial support; 140-bearing plate; 200-adapter sleeve; 300-overhead support. DETAILED DESCRIPTION

[0036] Since the passive anti-loosening mechanism itself does not generate or maintain the pretightening force, the threaded fastener is prone to micro relative slip under the action of continuous high-frequency vibration or alternating impact load, and then the pretightening force of the threaded fastener gradually attenuates, thereby affecting the reliability of the connection and the stability of the equipment operation.

[0037] Therefore, the present application provides a connection fastening device, which comprises a hydraulic drive mechanism 100 and an adapter sleeve 200.

[0038] The following will be described in detail Figures 1-5 The structure and shape of the connection fastening device will be described in detail:

[0039] The hydraulic drive mechanism 100 comprises a hydraulic motor 110; one end of the adapter sleeve 200 is connected with the hydraulic motor 110, and the other end is connected with the threaded fastener; the hydraulic motor 110 is used to drive the adapter sleeve 200 to rotate towards the locking direction of the threaded fastener, so as to apply a pretightening torque to the threaded fastener; when the threaded fastener reversely drives the adapter sleeve 200 to rotate due to loosening tendency, the hydraulic motor 110 generates a hydraulic torque in the un-unloaded hydraulic oil circuit to resist the reverse rotation, so as to form a damping effect of inhibiting the relative slip of the threaded fastener.

[0040] In the embodiment, the hydraulic motor 110 drives the adapter sleeve 200 to rotate towards the locking direction of the threaded fastener, so as to apply a pretightening torque to the threaded fastener, thereby keeping the pretightening force of the threaded fastener in a set range.

[0041] In addition, when the threaded fastener reversely drives the adapter sleeve 200 to rotate due to loosening tendency, the hydraulic motor 110 generates a hydraulic torque in the un-unloaded hydraulic oil circuit to resist the reverse rotation, so as to form a damping effect of inhibiting the relative slip of the threaded fastener.

[0042] In order to improve the flexibility of transmitting torque to the threaded fastener:

[0043] As shown in Figures 2-3 The hydraulic drive mechanism 100 further comprises a torque regulating structure 120; the torque regulating structure 120 comprises an electromagnetic clutch 121; the electromagnetic clutch 121 is arranged in series between the hydraulic motor 110 and the adapter sleeve 200.

[0044] In order to be able to control the electromagnetic clutch 121 according to the needs:

[0045] The torque regulating structure 120 further comprises a controller; the controller is electrically connected with the electromagnetic clutch 121, so as to control the on-off and controllable slip connection of the electromagnetic clutch 121.

[0046] In this embodiment, the controller controls the on-off and controllable slip connection of the electromagnetic clutch 121 as needed to adjust the on-off and size of the torque transmitted by the hydraulic motor 110 to the adapter sleeve 200, thereby improving the flexibility of the torque transmitted to the threaded fastener.

[0047] When the hydraulic motor 110 starts, the controller adjusts the excitation current of the electromagnetic clutch 121 to make the friction pair of the electromagnetic clutch 121 enter the slip control state, so as to gradually increase the pretightening torque transmitted by the hydraulic motor 110 to the threaded fastener through the adapter sleeve 200, thereby avoiding damage to the threaded fastener caused by the instantaneous torque impact generated during the start of the hydraulic motor 110.

[0048] In order to detect the pretightening torque acting on the threaded fastener in real time:

[0049] As shown in Figure 3 The torque regulating structure 120 further includes a torque sensor 122; the torque sensor 122 is arranged in series between the electromagnetic clutch 121 and the adapter sleeve 200, and is used to detect the transmission torque between the electromagnetic clutch 121 and the adapter sleeve 200.

[0050] In order to adjust the output torque of the hydraulic motor 110:

[0051] The hydraulic drive mechanism 100 further includes an electrically controlled pressure regulating valve; the electrically controlled pressure regulating valve is communicated with the working oil port of the hydraulic motor 110, and is used to adjust the hydraulic oil pressure entering the hydraulic motor 110; the controller is electrically connected with the electrically controlled pressure regulating valve, and is used to control the opening degree of the electrically controlled pressure regulating valve; the torque sensor 122 is electrically connected with the controller, and is used to transmit the transmission torque between the electromagnetic clutch 121 and the adapter sleeve 200 to the controller in real time.

[0052] In order to fix the electromagnetic clutch 121 and the torque sensor 122:

[0053] The hydraulic drive mechanism 100 further includes a bearing plate 140; the electromagnetic clutch 121 and the torque sensor 122 are both mounted on the bearing plate 140, and are used to limit the rotation of the whole electromagnetic clutch 121 and torque sensor 122.

[0054] In this embodiment, the torque sensor 122 is arranged in series between the electromagnetic clutch 121 and the adapter sleeve 200 to detect the transmission torque between the electromagnetic clutch 121 and the adapter sleeve 200 in real time, and then the torque applied by the adapter sleeve 200 to the threaded fastener is obtained.

[0055] When it is necessary to adjust the torque applied by the adapter sleeve 200 to the threaded fastener, the torque sensor 122 transmits the transmission torque between the electromagnetic clutch 121 and the adapter sleeve 200 to the controller, and the controller controls the opening degree of the electrically controlled pressure regulating valve according to the transmission torque, thereby adjusting the pressure of the hydraulic oil entering the hydraulic motor 110 to change the output torque of the hydraulic motor 110, so as to adjust the torque applied by the adapter sleeve 200 to the threaded fastener.

[0056] In order to dynamically respond to the loosening trend of the threaded fastener to avoid damage to the threaded fastener caused by alternating impact:

[0057] As shown in Figure 3 The electromagnetic clutch 121 is configured to enter a slip control state to transmit part of the torque when the torque sensor 122 detects that the transmission torque exceeds the upper threshold b, and the friction pair of the electromagnetic clutch 121 returns to the full engagement state when the torque sensor 122 detects that the transmission torque is lower than the lower threshold a. The lower threshold is less than the upper threshold to form a hysteresis interval E∈(a, b) to prevent frequent switching.

[0058] In this embodiment, when the torque sensor 122 detects that the transmission torque exceeds the upper threshold b, the controller adjusts the excitation current of the electromagnetic clutch 121 to change the electromagnetic suction strength in the electromagnetic clutch 121, thereby controlling the friction torque between the hydraulic motor 110 and the torque sensor 122, so that the electromagnetic clutch 121 in the slip control state transmits a torque not exceeding the upper threshold b between the torque sensor 122 and the hydraulic motor 110, to avoid overloading damage to the threaded fastener, and consume part of the reverse stress generated by the loosening trend of the threaded fastener. The remaining reverse stress is offset by the pretightening force of the threaded fastener itself.

[0059] In addition, by transmitting part of the torque between the torque sensor 122 and the hydraulic motor 110 through the electromagnetic clutch 121, the torque sensor 122 can detect that the transmission torque between the torque sensor 122 and the hydraulic motor 110 is less than the upper threshold b.

[0060] When the torque sensor 122 detects that the transmission torque is lower than the lower threshold a, the controller adjusts the excitation current of the electromagnetic clutch 121 to make the friction pair of the electromagnetic clutch 121 return to the full engagement state, and then the hydraulic motor 110 applies a pretightening torque to the threaded fastener through the electromagnetic clutch 121, the torque sensor 122 and the adapter sleeve 200, thereby restoring the pretightening force of the threaded fastener.

[0061] The adaptive scenarios of the above operation include, but are not limited to, threaded fasteners subjected to cyclic fluctuating loads or vibrations. When the peak of fluctuating loads or vibrations exceeds the upper threshold b, the friction pair of the electromagnetic clutch 121 enters the slip control state to cause slight relative slip of the threaded fastener. When the peak of fluctuating loads or vibrations is below the lower threshold a, the friction pair of the electromagnetic clutch 121 returns to the fully engaged state to cause the adapter sleeve 200 to apply a pre-tightening torque to the threaded fastener, thereby restoring the pre-tightening force of the threaded fastener.

[0062] In the above process, the upper threshold b is less than the maximum allowable reverse torque of the threaded fastener, and the lower threshold a is greater than the minimum pre-tightening torque required for the threaded fastener to maintain reliable connection, thereby providing sufficient safety factor.

[0063] In order to simultaneously apply pre-tightening torque to multiple threaded fasteners:

[0064] As shown in Figure 2 and Figure 4 , it further comprises a plurality of adapter sleeves 200; the hydraulic drive mechanism 100 further comprises a synchronous transmission structure 130; the plurality of adapter sleeves 200 are respectively connected to different threaded fasteners; the hydraulic motor 110 drives the plurality of adapter sleeves 200 to rotate in the same direction through the synchronous transmission structure 130 to simultaneously apply pre-tightening torque to the plurality of threaded fasteners.

[0065] In this embodiment, the hydraulic motor 110 drives the plurality of adapter sleeves 200 to rotate in the same direction through the synchronous transmission structure 130, and the plurality of adapter sleeves 200 respectively apply pre-tightening torque to the plurality of threaded fasteners to achieve synchronous pre-tightening of the plurality of threaded fasteners, thereby adapting to the scenario of multiple threaded fastener connections.

[0066] In order to adapt to the scenario where multiple threaded fasteners need to maintain different pre-tightening forces:

[0067] As shown in Figures 2-3 , it further comprises a plurality of torque regulating structures 120; the input end of the synchronous transmission structure 130 is connected to the hydraulic motor 110, and its multiple output ends are respectively connected to the plurality of electromagnetic clutches 121 in one-to-one correspondence; the plurality of torque sensors 122 are respectively arranged in series between the corresponding electromagnetic clutches 121 and the adapter sleeves 200.

[0068] In order to improve the adaptability of the device to low installation environments:

[0069] As shown in Figure 2 , the hydraulic motor 110 is installed at the bottom of the bearing plate 140 and located between the plurality of torque sensors 122; the synchronous transmission structure 130 is located on the upper side of the bearing plate 140 to reduce the height of the device.

[0070] In this embodiment, in a special design scenario, it is necessary to deliberately set the pre-tightening forces of multiple threaded fasteners to be different, for example, in a non-symmetrical force component, the threaded fastener on the tension side applies a higher pre-tightening force to balance the external bending moment.

[0071] Therefore, each threaded fastener corresponds to a different hysteresis interval E∈(a, b), and its pre-tightening force is located in the hysteresis interval E∈(a, b). By respectively connecting multiple torque sensors 122 between corresponding electromagnetic clutches 121 and adapter sleeves 200, multiple torque sensors 122 respectively detect the torque between multiple threaded fasteners and electromagnetic clutches 121; at the same time, the controller adjusts the excitation current of multiple electromagnetic clutches 121 to adjust the part of the torque transmitted between the torque sensor 122 and the hydraulic motor 110 to the threaded fastener corresponding electromagnetic clutch 121, thereby realizing the detection and control of the torque of multiple threaded fasteners, thereby adapting to the scenario where multiple threaded fasteners need to maintain different pre-tightening forces.

[0072] In order to dynamically respond to the loosening trend of multiple threaded fasteners:

[0073] As shown in Figure 3 When different torque sensors 122 respectively detect that the transmission torque is in the hysteresis interval E∈(a, b) and reaches the lower threshold a: the electromagnetic clutch 121 connected with the torque sensor 122 that detects that the transmission torque is in the hysteresis interval E∈(a, b) enters the slip control state to transmit part of the torque; the electromagnetic clutch 121 connected with the torque sensor 122 that detects that the transmission torque reaches the lower threshold a restores the fully engaged state.

[0074] In this embodiment, in the above dynamic response to the loosening trend of the threaded fastener, the electromagnetic clutch 121 connected with the torque sensor 122 that detects that it is in the hysteresis interval E∈(a, b) can have a slip control state or a fully engaged state.

[0075] Regarding how the electromagnetic clutch 121 connected with the torque sensor 122 that detects that it is in the hysteresis interval E∈(a, b) has a controllable slip state or a fully engaged state:

[0076] When the torque sensor 122 detects that the transmission torque exceeds the upper threshold b, the electromagnetic clutch 121 enters the slip control state to cause the threaded fastener to micro- relative slip, and as the reverse stress generated by the threaded fastener decreases, the torque sensor 122 determines the pretightening force of the threaded fastener according to the detected transmission torque. When the torque sensor 122 detects that the transmission torque is in the hysteresis interval E∈(a, b), the electromagnetic clutch 121 remains in the slip control state; when the torque sensor 122 detects that the transmission torque is below the lower threshold a, the electromagnetic clutch 121 returns to the fully engaged state, thereby restoring the pretightening force of the threaded fastener through the adapter sleeve 200, so that the torque sensor 122 detects that the transmission torque returns to the hysteresis interval E∈(a, b).

[0077] In the above case, when the hydraulic motor 110 drives the adapter sleeve 200 connected to the torque sensor 122 that detects that the transmission torque is below the lower threshold a, it may also drive the adapter sleeve 200 connected to the torque sensor 122 that detects that the transmission torque is in the hysteresis interval E∈(a, b) to rotate synchronously.

[0078] To solve the above problem, when different torque sensors 122 respectively detect that the transmission torque is in the hysteresis interval E∈(a, b) and reaches the lower threshold a, the electromagnetic clutch 121 connected to the torque sensor 122 that detects that the transmission torque is in the hysteresis interval E∈(a, b) enters the slip control state to transmit part of the torque, thereby causing the torque sensor 122 to slide relative to the output end of the synchronous transmission structure 130; at the same time, the electromagnetic clutch 121 connected to the torque sensor 122 that detects that the transmission torque reaches the lower threshold a returns to the fully engaged state, so that the synchronous transmission structure 130 only drives the torque sensor 122 sensing shaft whose transmission torque reaches the lower threshold a to rotate, thereby restoring the pretightening force of the threaded fastener through the adapter sleeve 200, so that the loosening trend of multiple threaded fasteners can be dynamically responded.

[0079] To improve the convenience of connecting the device to the threaded fastener:

[0080] As shown in Figure 3 , the electromagnetic clutch 121 is further configured to be in a disconnected state when the multiple adapter sleeves 200 are respectively installed in position with the multiple threaded fasteners, so that the multiple adapter sleeves 200 can rotate independently.

[0081] In this embodiment, because some threaded fasteners need to be installed in position, such as bolts or nuts, the adapter sleeve 200 needs to be fitted onto the head of the bolt or the nut to transmit torque to the threaded fastener, and the multiple bolts or nuts are at different angles of the set pretightening force, so the multiple adapter sleeves 200 need to be connected to the corresponding threaded fasteners at different angles.

[0082] Therefore, when the plurality of adapter sleeves 200 are respectively installed in position with the plurality of threaded fasteners, the friction pair of the electromagnetic clutch 121 is in a disconnected state to release the rigid connection between the torque sensor 122 and the synchronous transmission structure 130, and then the adapter sleeve 200 is manually rotated around its own axis to enable the adapter sleeve 200 to be sleeved on the threaded fastener, thereby adapting to different installation angles of the threaded fastener.

[0083] In order to realize the same direction rotation of the plurality of adapter sleeves 200 driven by the hydraulic motor 110 through the synchronous transmission structure 130:

[0084] As shown in Figure 5 , the synchronous transmission structure 130 comprises a driving gear 131 and a plurality of follower gears 132; the driving gear 131 is connected with the output end of the hydraulic motor 110; the plurality of follower gears 132 are respectively connected with the plurality of electromagnetic clutches 121 away from the torque sensor 122, and are all engaged with the driving gear 131.

[0085] In this embodiment, the hydraulic motor 110 drives the driving gear 131 to rotate around its own axis, the driving gear 131 drives the plurality of follower gears 132 to synchronously rotate around their own axes, and the plurality of follower gears 132 respectively drive the input shafts of the plurality of electromagnetic clutches 121 to rotate, thereby realizing the same direction rotation of the plurality of adapter sleeves 200 driven by the hydraulic motor 110 through the synchronous transmission structure 130.

[0086] In order to reduce the deviation of the driving gear 131 and the follower gears 132 during rotation:

[0087] As shown in Figure 5 , the synchronous transmission structure 130 further comprises a synchronous bracket 133; the driving gear 131 and the plurality of follower gears 132 are all rotationally installed on the synchronous bracket 133.

[0088] In order to reduce the friction force of the driving gear 131 and the plurality of follower gears 132 with the synchronous bracket 133 during rotation:

[0089] As shown in Figure 3 , the synchronous transmission structure 130 further comprises a driving shaft 134, a plurality of follower shafts 135 and a plurality of seat bearings 136; the driving shaft 134 is inserted into the driving gear 131 and is connected with the hydraulic motor 110; the plurality of follower shafts 135 are respectively inserted into the plurality of follower gears 132 and are respectively connected with the plurality of electromagnetic clutches 121; the plurality of seat bearings 136 are all installed on the synchronous bracket 133; the driving shaft 134 and the plurality of follower shafts 135 are respectively installed on the plurality of seat bearings 136 in interference fit.

[0090] In order to improve the stability of the synchronous bracket 133 during operation:

[0091] As shown in Figure 3As shown, the synchronous transmission structure 130 also includes a series support 137; one end of the series support 137 is connected to the synchronous support 133, and the other end is connected to the bearing plate 140, for fixing the synchronous support 133.

[0092] In this embodiment, by rotatably mounting the drive gear 131 and multiple follower gears 132 on the synchronization bracket 133, the relative positions of the drive gear 131 and the follower gears 132 are fixed, avoiding the offset of the drive gear 131 and the follower gears 132 during rotation, thereby ensuring the meshing accuracy of the drive gear 131 and the follower gears 132, and reducing the deviation of the drive gear 131 and the follower gears 132 during rotation.

[0093] To reduce the axial impact of threaded fasteners on the appropriate sleeve 200:

[0094] like Figure 1 As shown, it also includes an overhead support 300; multiple torque sensors 122 are installed on the overhead support 300 to suspend the adapter sleeve 200 and avoid axial contact between the adapter sleeve 200 and the threaded fastener.

[0095] In this embodiment, by mounting multiple torque sensors 122 on the overhead bracket 300, the adapter sleeve 200 is suspended, thereby avoiding axial contact between the adapter sleeve 200 and the threaded fastener. This provides axial space during the slight relative sliding of the threaded fastener, thus preventing the threaded fastener from directly impacting the adapter sleeve 200 and reducing the axial impact of the threaded fastener on the adapter sleeve 200.

[0096] The present invention also provides a first method of using the connecting fastening device, comprising the following steps:

[0097] OP0 Threaded Fastener Locking: The threaded fastener is locked using a torque tool so that the preload of the threaded fastener reaches the corresponding hysteresis interval E∈(a,b).

[0098] OP1 connection fastener connection with threaded fastener: Fit the appropriate sleeve 200 onto the locking threaded fastener.

[0099] In this step:

[0100] By stopping the power supply to the electromagnetic clutch 121, the friction pair of the electromagnetic clutch 121 is disengaged, thereby releasing the rigid connection between the torque sensor 122 and the synchronous transmission structure 130. Then, the adapter sleeve 200 is manually rotated around its own axis to adjust the adapter sleeve 200 to the installation angle corresponding to the threaded fastener, thereby fitting the adapter sleeve 200 onto the locked threaded fastener.

[0101] OP2 connecting fastener fixation: the connecting fastener is fixed to the threaded fastener mounting position by the overhead support 300.

[0102] In this step:

[0103] In the process of fitting the adapter sleeve 200 to the threaded fastener, the overhead support 300 moves synchronously with the adapter sleeve 200 to the threaded fastener mounting position, and the overhead support 300 fixes the two after they are attached, at which time the overhead support 300 overheadly arranges the adapter sleeve 200 to avoid axial contact between the adapter sleeve 200 and the threaded fastener, thereby providing axial space during the slight relative sliding of the threaded fastener, thereby supporting the subsequent device in dynamically responding to the loosening trend of the threaded fastener.

[0104] In addition, the overhead support 300 overheadly arranges the adapter sleeve 200 to provide axial space during the slight relative sliding of the threaded fastener, thereby avoiding direct impact of the adapter sleeve 200 during the slight relative sliding of the threaded fastener, thereby reducing the axial impact of the threaded fastener on the adapter sleeve 200.

[0105] OP3 actively pre-tighten the threaded fastener: the hydraulic motor 110 drives the adapter sleeve 200 to rotate towards the locking direction of the threaded fastener, so as to apply a pre-tightening torque to the threaded fastener, so that the pre-tightening force of the threaded fastener is maintained within a set range.

[0106] In this step:

[0107] When the threaded fastener reversely drives the adapter sleeve 200 to rotate due to the loosening trend, the hydraulic motor 110 generates a hydraulic torque in the unloading hydraulic circuit to resist the reverse rotation, thereby forming a damping effect to suppress the relative sliding of the threaded fastener.

[0108] In order to dynamically respond to the loosening trend of the threaded fastener and avoid damage to the threaded fastener caused by alternating impact:

[0109] When the torque sensor 122 detects that the transmission torque exceeds the upper threshold b, the controller adjusts the excitation current of the electromagnetic clutch 121 to make the friction pair of the electromagnetic clutch 121 enter the slip control state, thereby transmitting a torque not exceeding the upper threshold b between the torque sensor 122 and the hydraulic motor 110, to avoid overloading damage to the threaded fastener.

[0110] In this process, the electromagnetic clutch 121 in the slip control state consumes part of the reverse stress generated by the loosening trend of the threaded fastener, and the remaining reverse stress is offset by the pre-tightening force of the threaded fastener itself, which is used to reduce the relative sliding amplitude of the threaded fastener.

[0111] When the torque sensor 122 detects that the transmission torque is lower than the lower threshold a, the controller adjusts the excitation current of the electromagnetic clutch 121 to restore the friction pair of the electromagnetic clutch 121 to the fully engaged state, and then the hydraulic motor 110 applies the pre-tightening torque to the threaded fastener through the adapter sleeve 200, thereby restoring the pre-tightening force of the threaded fastener to prevent subsequent impact from causing the threaded fastener to loosen.

[0112] In order to adapt the device to the scene of actively pre-tightening multiple threaded fasteners:

[0113] The hydraulic motor 110 drives the multiple adapter sleeves 200 to rotate in the same direction through the synchronous transmission structure 130, and the multiple adapter sleeves 200 respectively apply pre-tightening torque to the multiple threaded fasteners to achieve synchronous pre-tightening of the multiple threaded fasteners.

[0114] In order to adapt to the scene where multiple threaded fasteners need to maintain different pre-tightening forces:

[0115] The multiple torque regulating structures 120 are respectively connected in series between the output end of the synchronous transmission structure 130 and the multiple adapter sleeves 200, so that the multiple torque sensors 122 respectively detect the torque between the multiple threaded fasteners and the electromagnetic clutch 121, and the controller adjusts the excitation current of the electromagnetic clutch 121 according to the detection data of the torque sensor 122, so that the electromagnetic clutch 121 connected with the threaded fastener with the smallest pre-tightening force enters the slip control state, and then the electromagnetic clutch 121 applies a corresponding pre-tightening force to the threaded fastener through the adapter sleeve 200.

[0116] In order to be able to dynamically respond to the loosening trend of multiple threaded fasteners:

[0117] When the different torque sensors 122 respectively detect that the transmission torque is in the hysteresis interval E∈(a,b) and reaches the lower threshold a, the electromagnetic clutch 121 connected with the torque sensor 122 that detects that the transmission torque is in the hysteresis interval E∈(a,b) enters the slip control state to transmit part of the torque, thereby causing the torque sensor 122 to slide relative to the output end of the synchronous transmission structure 130; at the same time, the electromagnetic clutch 121 connected with the torque sensor 122 that detects that the transmission torque reaches the lower threshold a restores the fully engaged state to make the synchronous transmission structure 130 only drive the torque sensor 122 sensing shaft to rotate when the transmission torque reaches the lower threshold a, and then restore the pre-tightening force of the threaded fastener through the adapter sleeve 200.

[0118] The application also provides a second use method of the connecting fastening device, comprising the following steps:

[0119] OP0 connects the connecting fastening device with the threaded fastener: the adapter sleeve 200 is sleeved on the threaded fastener.

[0120] In this step:

[0121] By manually rotating the adapter sleeve 200 around its own axis, or manually rotating the threaded fastener, the installation angle of the adapter sleeve 200 and the threaded fastener is made to correspond, so that the adapter sleeve 200 is sleeved onto the threaded fastener.

[0122] OP1 Connect the fastening device to the installation position of the threaded fastener through the overhead support 300.

[0123] In this step:

[0124] During the process of sleeving the adapter sleeve 200 onto the threaded fastener, the overhead support 300 moves synchronously with the adapter sleeve 200 to the installation position of the threaded fastener, and the overhead support 300 is fixed after being attached to the installation position. At this time, the overhead support 300 suspends the adapter sleeve 200 to avoid axial contact between the adapter sleeve 200 and the threaded fastener, thereby providing axial space during the slight relative sliding of the threaded fastener, thereby supporting the subsequent device in responding to the loosening trend of the threaded fastener.

[0125] In addition, by suspending the adapter sleeve 200 through the overhead support 300, axial space is provided during the slight relative sliding of the threaded fastener, thereby avoiding direct impact of the adapter sleeve 200 during the slight relative sliding of the threaded fastener, thereby reducing the axial impact of the threaded fastener on the adapter sleeve 200.

[0126] OP2 Threaded fastener locking: The hydraulic motor 110 locks the threaded fastener through the adapter sleeve 200. During this process, the transmission torque between the adapter sleeve 200 and the electromagnetic clutch 121 is detected in real time through the torque sensor 122, so that the pretightening force of the threaded fastener reaches the corresponding hysteresis interval E∈(a,b).

[0127] In this step:

[0128] In order to adapt the device to the scene of locking multiple threaded fasteners:

[0129] A plurality of torque regulating structures 120 are connected in series between the output end of the synchronous transmission structure 130 and the plurality of adapter sleeves 200, so that a plurality of torque sensors 122 detect the torque between the plurality of threaded fasteners and the electromagnetic clutch 121. The controller adjusts the excitation current of the electromagnetic clutch 121 according to the detection data of the torque sensor 122, so that the electromagnetic clutch 121 connected to the threaded fastener reaching the set pretightening force enters the slip control state. After the plurality of threaded fasteners are all locked, the plurality of electromagnetic clutches 121 return to the fully engaged state.

[0130] In order to adapt the device to the scene that multiple threaded fasteners are locked with different pre-tightening forces:

[0131] By setting multiple threaded fasteners to different pre-tightening forces, the electromagnetic clutch 121 connected to the threaded fastener reaching the set pre-tightening force enters the slip control state, and after multiple threaded fasteners are all locked according to the set pre-tightening force, the multiple electromagnetic clutches 121 restore to the fully engaged state.

[0132] In the above process, the reason for controlling the electromagnetic clutch 121 connected to the threaded fastener reaching the set pre-tightening force to enter the slip control state is to adapt the sleeve 200 to continuously transmit the pre-tightening torque to the threaded fastener, so that after the pre-tightening torque of the threaded fastener is affected during the locking process of other threaded fasteners, the pre-tightening torque restores the pre-tightening force of the threaded fastener to the set value.

[0133] In order to lock multiple threaded fasteners according to the set sequence:

[0134] The controller controls the electromagnetic clutch 121 connected to the first locking sequence threaded fastener to enter the fully engaged state according to the set sequence, and then the hydraulic motor 110 drives the threaded fastener to lock through the adaptive sleeve 200. During this process, the torque sensor 122 detects the transmission torque between the adaptive sleeve 200 and the electromagnetic clutch 121 in real time, and the controller adjusts the excitation current of the electromagnetic clutch 121 according to the detection data of the torque sensor 122, so that the electromagnetic clutch 121 connected to the threaded fastener reaching the set pre-tightening force enters the slip control state. Then the controller controls the electromagnetic clutch 121 connected to the second locking sequence threaded fastener to enter the fully engaged state according to the set sequence, and repeats the above steps to lock multiple threaded fasteners in turn.

[0135] OP3 actively pre-tighten threaded fastener: This step is the same as the "OP3 actively pre-tighten threaded fastener" step in the first use method of connecting the fastening device.

[0136] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A connection fastening device, characterized in that: comprising a hydraulic drive mechanism (100) and an adapter sleeve (200); the hydraulic drive mechanism (100) comprises a hydraulic motor (110); one end of the adapter sleeve (200) is connected with the hydraulic motor (110), and the other end is connected with a threaded fastener; the hydraulic motor (110) is used to drive the adapter sleeve (200) to rotate towards the locking direction of the threaded fastener, so as to apply a pre-tightening torque to the threaded fastener; when the threaded fastener reverses due to the loosening trend, the hydraulic motor (110) generates a hydraulic torque in the unloading hydraulic oil circuit to resist the reverse rotation, so as to form a damping effect of inhibiting the relative slip of the threaded fastener; the hydraulic drive mechanism (100) further comprises a torque regulating structure (120); the torque regulating structure (120) comprises an electromagnetic clutch (121); the electromagnetic clutch (121) is arranged in series between the hydraulic motor (110) and the adapter sleeve (200); the torque regulating structure (120) further comprises a torque sensor (122); the torque sensor (122) is arranged in series between the electromagnetic clutch (121) and the adapter sleeve (200), and is used to detect the transmission torque between the electromagnetic clutch (121) and the adapter sleeve (200); the electromagnetic clutch (121) is configured to: when the torque sensor (122) detects that the transmission torque exceeds an upper threshold value b, the friction pair enters a slip control state to transmit part of the torque; when the torque sensor (122) detects that the transmission torque is lower than a lower threshold value a, the friction pair returns to a full engagement state; the lower threshold value is less than the upper threshold value, so as to form a hysteresis interval E∈(a, b) to prevent frequent switching; further comprising a plurality of the adapter sleeves (200); the hydraulic drive mechanism (100) further comprises a synchronous transmission structure (130); a plurality of the adapter sleeves (200) are respectively connected with different threaded fasteners; the hydraulic motor (110) drives a plurality of the adapter sleeves (200) to rotate in the same direction through the synchronous transmission structure (130), so as to simultaneously apply a pre-tightening torque to a plurality of threaded fasteners.

2. The connection fastening device according to claim 1, characterized in that: further comprising a plurality of the torque regulating structures (120); an input end of the synchronous transmission structure (130) is connected with the hydraulic motor (110), a plurality of output ends thereof are respectively connected with a plurality of the electromagnetic clutches (121), and are one-to-one corresponding; a plurality of the torque sensors (122) are respectively arranged in series between the corresponding electromagnetic clutches (121) and the adapter sleeves (200).

3. The connection fastening device according to claim 2, characterized in that: when at least one of a plurality of the torque sensors (122) detects that the transmission torque is in the hysteresis interval E∈(a, b), and at least another one detects that the transmission torque reaches the lower threshold value a: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The electromagnetic clutch (121) connected with the torque sensor (122) detecting that the transmission torque is in the hysteresis interval E ∈ (a, b) enters a slip control state to transmit partial torque; The electromagnetic clutch (121) connected with the torque sensor (122) detecting that the transmission torque reaches the lower threshold a resumes a full engagement state.

4. The connecting fastening device according to claim 3, characterized in that: The electromagnetic clutch (121) is further configured to: When a plurality of the adaptive sleeves (200) are respectively positioned and installed with a plurality of threaded fasteners, the friction pairs are in a disengaged state, so that the plurality of the adaptive sleeves (200) can rotate independently.

5. The connecting fastening device according to claim 4, characterized in that: The synchronous transmission structure (130) comprises a driving gear (131) and a plurality of follower gears (132); The driving gear (131) is connected with the output end of the hydraulic motor (110); A plurality of the follower gears (132) are respectively connected with a plurality of the electromagnetic clutches (121) away from the torque sensor (122), and are all engaged with the driving gear (131).

6. The connecting fastening device according to claim 5, characterized in that: The synchronous transmission structure (130) further comprises a synchronous support (133); The driving gear (131) and a plurality of the follower gears (132) are all rotationally installed on the synchronous support (133).

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