Tightening device

Abstract

This invention discloses a tightening device, comprising a clamping part, a supporting part, and a telescopic part. The clamping part is used to clamp a fastener. One end of the supporting part is fixedly connected to the clamping part, and the other end of the supporting part is connected to the telescopic part. The telescopic part extends and retracts in a direction parallel to the moving direction of the fastener. The telescopic part is configured to extend and retract as the fastener rotates along its own axis, so that the clamping part and the fastener are always clamped. The fastener is clamped by the clamping part of the tightening device. The support part rotates, causing the fastener to rotate around its own axis, thereby tightening or loosening the fastener. During this rotation, the telescopic part extends and retracts in a direction parallel to the moving direction of the fastener, while the clamping part always maintains a clamping state on the fastener, increasing the safety of the user. Compared to existing technologies where the fastener needs to be disengaged from the tightening device, leading to damage to the fastener, this invention reduces the risk of damage to the fastener during this process.

Description

Technical Field

[0001] This invention relates to the field of fastening, and particularly to a tightening device. Background Technology

[0002] The high-pressure rotor of an aero-engine consists of a high-pressure compressor rotor and a high-pressure turbine rotor. The two rotors are connected and fastened by dozens of bolts and nuts. Because the connection is located inside the rotor cavity, the openness is poor, and it is difficult to tighten the nuts.

[0003] The existing technology CN201410512757.9 uses a gear mechanism to place and tighten the nut inside the rotor cavity. The gear structure is complex, and because the connecting nut is close to the inner wall of the rotor, the end drive gear cannot be selected with a large module, resulting in a small tooth width and weak strength, thus failing to provide a large tightening torque. Furthermore, during the tightening process, the nut rotates and generates axial displacement. Because the nut is inside the rotor cavity, the engagement between the device and the nut cannot be directly observed, making it prone to slippage and damage to the nut and the device.

[0004] In summary, existing devices cannot guarantee that the nut will not slip off from the tightening device during the tightening or loosening process, thus preventing damage to the nut. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defect in the prior art that the nut and the tightening device cannot maintain engagement at all times during the tightening process, and to provide a tightening device.

[0006] The present invention solves the above-mentioned technical problems through the following technical solution:

[0007] A tightening device includes a clamping part, a supporting part, and a telescopic part. The clamping part is used to clamp a fastener. One end of the supporting part is fixedly connected to the clamping part, and the other end of the supporting part is connected to the telescopic part. The telescopic direction of the telescopic part is parallel to the moving direction of the fastener. The telescopic part is configured to extend and retract when the fastener rotates along its own axis so that the clamping part and the fastener always maintain a clamping state.

[0008] In this solution, the fastener is clamped by the clamping part of the tightening device. Through the rotational movement of the support part, torque is applied to the fastener, causing it to rotate around its own axis, thus tightening or loosening it. During the rotation of the fastener, the telescopic part extends and retracts parallel to the direction of movement of the fastener, while the clamping part maintains a clamping state on the fastener at all times, increasing the safety of the user of the tightening device. Compared to existing technologies where the fastener often needs to disengage from the tightening device during the tightening or loosening process, leading to damage, this solution significantly reduces the defect of fastener damage during this process and improves the service life of the fastener.

[0009] Preferably, the telescopic part includes a sleeve and a movable part, one end of the movable part is disposed outside the sleeve, the other end of the movable part is disposed inside the sleeve, and the movable part is movable relative to the sleeve.

[0010] In this solution, the above structure is adopted. By moving the moving part, the telescopic part can compensate for the distance that the fastener rotates around its own axis, thereby ensuring that the fastener is always clamped to the tightening device during the tightening and loosening process.

[0011] Preferably, the moving part includes an elastic element and a rod, one end of the rod is disposed outside the sleeve, the other end of the rod is disposed inside the sleeve and abuts against one end of the elastic element, and the other end of the elastic element abuts against the inner wall of the sleeve along the moving direction of the moving part.

[0012] In this solution, the aforementioned structure is used to compensate for the distance the fastener moves after rotating around its own axis by moving the rod within the sleeve. The elastic element is connected to the rod, so that the movement of the rod within the sleeve is subject to elastic force. This allows the rod and the elastic element to combine into a deformable body during the tightening or loosening of the fastener, compensating for the displacement generated during the tightening or loosening process.

[0013] Preferably, the tightening device further includes a connector, the outer side of the sleeve is provided with a groove, the moving part is provided with a first through hole, the connector passes through the first through hole and the groove, and the moving part moves to allow the connector to slide in the groove.

[0014] In this solution, the above structure is adopted, and the connecting part moves in the groove. On the one hand, the distance of movement of the moving part can be limited, and on the other hand, after the tightening device tightens or loosens the fastener, the tightening device and the fastener can be separated by manually moving the connecting part.

[0015] Preferably, the groove is provided with a first groove and a second groove, which are interconnected. The extension direction of the first groove is parallel to the movement direction of the moving part, and the extension direction of the second groove forms an angle with the extension direction of the first groove. When the tightening device tightens the fastener, the connector moves in the first groove along the extension direction of the telescopic part. When the tightening device tightens the fastener to the correct position, the connector can slide from the first groove to the second groove.

[0016] In this solution, the tightening device can be removed from the fastener or moved to the position of the next fastener after the tightening device has tightened or loosened the fastener by moving the connector in the first or second groove.

[0017] Preferably, the second groove and the first groove are L-shaped as a whole.

[0018] In this design, the length of the first groove is greater than the length of the second groove, which allows the tightening device to tighten or loosen the fastener within a larger range, thus increasing the applicability of the tightening device. The second groove is horizontal, which facilitates the movement of the connector from the first groove to the second groove, so that after the tightening device loosens or tightens the fastener, the tightening device can be removed from the fastener.

[0019] Preferably, the tightening device further includes an indexing device with a recess, one end of the telescopic part is connected to the support part, and the other end of the telescopic part is disposed in the recess.

[0020] In this solution, an indexing device is used. When dealing with fasteners with many mounting positions, and when the position of the fastener to be tightened needs to be moved, the telescopic part of the tightening device can be moved to the position of the indexing device. The recess on the indexing device facilitates the telescopic part and the support part to rotate as a whole around the structure in which the telescopic part is set in the recess.

[0021] Preferably, the tightening device further includes a bearing, which is fixed in the recess, one end of the telescopic part is connected to the support part, and the other end of the telescopic part is disposed in the inner ring of the bearing.

[0022] In this design, the bearing is provided to facilitate the rotation of the support and telescopic parts as a whole around the bearing during the tightening process, thereby reducing axial pressure and radial friction.

[0023] Preferably, the recess is a second through hole, and one end of the telescopic part disposed in the recess is engaged with the second through hole.

[0024] In this design, the telescopic part is engaged with the second through hole, which facilitates the telescopic part to extend and retract along its own axis during the tightening process. It also facilitates the telescopic part to be moved out of the second through hole when the tightening device needs to be moved.

[0025] Preferably, the indexing device is an indexing disk, and the second through holes are evenly distributed along the circumferential direction on the indexing disk.

[0026] In this design, the second through holes are evenly distributed along the indexing plate, and the tightening device can be used for equipment that requires fasteners to be installed evenly.

[0027] Based on common knowledge in the field, the above preferred solutions can be freely combined to obtain various preferred embodiments of the present invention.

[0028] The significant advantages of this invention are as follows: The fastener is clamped by the clamping part of the tightening device. Through the rotational movement of the supporting part, a torque is applied to the fastener, causing it to rotate around its own axis, thus tightening or loosening it. During the rotation of the fastener, the telescopic part extends and retracts along a direction parallel to the fastener's movement, while the clamping part maintains a clamping state on the fastener, increasing the safety of the user of the tightening device. Compared to existing technologies where the fastener often needs to detach from the tightening device during tightening or loosening, leading to damage, this solution greatly reduces the risk of damage during this process and improves the service life of the fastener. Attached Figure Description

[0029] Figure 1 This is a cross-sectional structural schematic diagram of a tightening device according to an embodiment of the present invention.

[0030] Figure 2 This is a cross-sectional structural schematic diagram of the telescopic part of the tightening device according to an embodiment of the present invention.

[0031] Figure 3 This is a three-dimensional structural diagram of the indexing device of a tightening device according to an embodiment of the present invention.

[0032] Figure 4 This is a three-dimensional structural diagram of a C-type wrench tightening device according to an embodiment of the present invention.

[0033] Figure 5 This is a three-dimensional structural diagram of the sleeve of a tightening device according to an embodiment of the present invention.

[0034] Figure 6 This is a three-dimensional structural diagram of the telescopic part of the tightening device according to an embodiment of the present invention.

[0035] Figure 7 This is a three-dimensional structural diagram of the telescopic part of the tightening device in a compressed state according to an embodiment of the present invention.

[0036] Figure 8 This is a schematic diagram of the process of inserting or removing the tightening device according to an embodiment of the present invention.

[0037] Figure 9a This is a cross-sectional view of a fastener placed in a fastener according to an embodiment of the present invention.

[0038] Figure 9b This is a cross-sectional view of the telescopic part of a tightening device according to an embodiment of the present invention in its working state.

[0039] Figure 9c This is a schematic diagram illustrating the process of installing the ratchet head of the tightening device onto a fastener according to an embodiment of the present invention.

[0040] Figure 10 This is a three-dimensional structural diagram showing the position of the telescopic part on the indexing plate during the tightening process of a tightening device according to an embodiment of the present invention.

[0041] Figure 11 This is a three-dimensional structural diagram of the tightening device after tightening according to an embodiment of the present invention.

[0042] Explanation of reference numerals in the attached figures

[0043] Tightening device 1

[0044] Clamping part 2

[0045] Support section 3

[0046] Telescopic part 4

[0047] Sleeve 41

[0048] Slot 411

[0049] First slot 412

[0050] Second slot 413

[0051] Square Hole 414

[0052] Mobile Unit 42

[0053] Elastic element 421

[0054] Member 422

[0055] First through hole 423

[0056] Connector 5

[0057] Indexing device 6

[0058] 60-inch indexing plate

[0059] Recess 61

[0060] Second through hole 625

[0061] Bearing 7

[0062] Fastener 8

[0063] Wrench body 11

[0064] Input axis 12

[0065] Ratchet head 13 Detailed Implementation

[0066] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments.

[0067] A tightening device 1 is used in the tightening process of a high-pressure rotor of an aero engine, the high-pressure rotor comprising a high-pressure compressor rotor and a high-pressure turbine rotor, such as... Figure 1 The two rotors shown are fixed together by dozens of bolts and nuts. Because the connection point is located inside the rotor cavity, the opening is poor, making tightening relatively difficult. Figures 1-11 As shown, the tightening device 1 in this embodiment includes a clamping part 2, a supporting part 3, and a telescopic part 4. The clamping part 2 is used to clamp the fastener 8. One end of the supporting part 3 is fixedly connected to the clamping part 2, and the other end of the supporting part 3 is connected to the telescopic part 4. The telescopic direction of the telescopic part 4 is parallel to the moving direction of the fastener 8. The telescopic part 4 is configured to extend and retract when the fastener 8 rotates along its own axis so that the clamping part 2 and the fastener 8 always maintain a clamping state, thereby realizing the placement and tightening of the nut in the rotor cavity.

[0068] In this design, the fastener 8 is clamped by the clamping part 2 of the tightening device 1. Through the rotational movement of the support part 3, torque is applied to the fastener 8, causing it to rotate around its own axis, thus tightening or loosening it. During the rotation of the fastener 8, the telescopic part 4 extends and retracts along a direction parallel to the movement of the fastener 8. Simultaneously, the clamping part 2 maintains a clamping state on the fastener 8, increasing the safety of the user of the tightening device 1. Compared to existing technologies where the fastener 8 often needs to detach from the tightening device 1 during tightening or loosening, leading to damage, this solution significantly reduces the risk of damage to the fastener 8 during this process, thus improving its service life.

[0069] In this embodiment, the support portion 3 is C-shaped, such as... Figure 4As shown, the C-type wrench includes a wrench body 11, an input shaft 12, and a ratchet head 13. The input shaft 12 is fixed to one end of the wrench body 11; the ratchet head 13 is fixed to the other end of the wrench body 11; the axis of the input shaft 12 is coaxial with the axis of the ratchet head 13. The tightening device 1 uses a C-type wrench for force transmission, which provides good torque transmission. A built-in spring at the torque input end can lift the entire device, ensuring that the tightening tool and the nut remain engaged during tightening. The clamping part 2 includes a ratchet mechanism, and the support part 3 reciprocates to cause the ratchet mechanism to reciprocate along a fixed axis.

[0070] In this embodiment, as Figure 2 , Figure 3 As shown, the telescopic part 4 includes a sleeve 41 and a movable part 42. One end of the movable part 42 is disposed outside the sleeve 41, and the other end of the movable part 42 is disposed inside the sleeve 41, and the movable part 42 can move relative to the sleeve 41. With this structure, the movement of the movable part 42 allows the telescopic part 4 to compensate for the distance the fastener 8 rotates around its own axis, thereby ensuring that the fastener 8 remains clamped to the tightening device 1 during tightening and loosening.

[0071] Specifically, the moving part 42 includes an elastic member 421 and a rod 422. One end of the rod 422 is disposed outside the sleeve 41, and the other end of the rod 422 is disposed inside the sleeve 41 and abuts against one end of the elastic member 421. The other end of the elastic member 421 abuts against the inner wall of the sleeve 41 along the moving direction of the moving part 42. The rod 422 includes a stepped portion, one end of the elastic member 421 is sleeved on the stepped portion, and the other end of the elastic member 421 abuts against the inner wall of the sleeve 41. Figure 2 As shown, the built-in spring at the tightening torque input end can lift the C-type wrench and the entire device when the rod 422 is fixed, ensuring that the tightening tool and the nut are always engaged, increasing tool safety. In this embodiment, when the nut is finally tightened, the spring can limit the movement to ensure that the spring's clamping force does not act on the nut, avoiding increasing the friction on the nut's end face, reducing the tightening effect, and avoiding the influence of the spring's clamping force on the nut's tightening torque.

[0072] In this structure, the movement of the rod 422 within the sleeve 41 compensates for the distance the fastener 8 moves after rotating around its own axis. The elastic element 421 is connected to the rod 422 so that the movement of the rod 422 within the sleeve 41 is subject to elastic force. This allows the rod 422 and the elastic element 421 to combine into a deformable body during the tightening or loosening of the fastener 8, thus compensating for the displacement of the fastener 8 during tightening or loosening.

[0073] In this embodiment, the tightening device 1 further includes a connector 5. A groove 411 is provided on the outer side of the sleeve 41, and a first through hole 423 is provided on the moving part 42. The connector 5 passes through the first through hole 423 and the groove 411. The moving part 42 moves to allow the connector 5 to slide within the groove 411. With this structure, the movement of the connector 5 within the groove 411 limits the distance the moving part 42 can travel. Furthermore, after the tightening device 1 tightens or loosens the fastener 8, the tightening device 1 and the fastener 8 can be separated by manually moving the connector 5.

[0074] In this embodiment, as Figure 5 As shown, the sleeve 41 includes a first groove 412, a second groove 413, a vertical groove 411 disposed in the second groove 413, and a square hole 414. The square hole 4141d is a torque wrench input interface. The connector 5 passes through the rotating shaft 2 and is engaged in the groove 411 of the input shaft 12, thereby limiting the position of the rod 422 on the input shaft 12.

[0075] Specifically, the groove 411 is provided with a first groove 412 and a second groove 413, which are connected to each other. The extension direction of the first groove 412 is parallel to the movement direction of the moving part 42, and the extension direction of the second groove 413 is at an angle to the extension direction of the first groove 412. When the tightening device 1 tightens the fastener 8, the connecting member 5 moves in the first groove 412 along the extension direction of the telescopic part 4. When the tightening device 1 tightens the fastener 8 into place, the connecting member 5 can slide from the first groove 412 to the second groove 413.

[0076] The tightening device 1 can be removed from the fastener 8 or moved to the position of the next fastener 8 after the tightening device 1 is tightened or loosened by the movement of the connector 5 in the first groove 412 or the second groove 413.

[0077] In this embodiment, the second groove 413 and the first groove 412 are generally L-shaped. The length of the first groove 412 is greater than the length of the second groove 413, which allows the tightening device 1 to tighten or loosen the fastener 8 over a larger range, thus increasing the applicability of the tightening device 1. The second groove 413 is horizontal, which facilitates the movement of the connector 5 from the first groove 412 to the second groove 413, so that after the tightening device 1 loosens or tightens the fastener 8, the tightening device 1 can be removed from the fastener 8.

[0078] In this embodiment, the tightening device 1 further includes an indexing device 6. The indexing device 6 has a recess 61. One end of the telescopic part 4 is connected to the support part 3, and the other end of the telescopic part 4 is disposed in the recess 61. By using the indexing device 6, when dealing with fasteners 8 with multiple mounting positions, and when the position of the fastener 8 to be tightened needs to be moved, the telescopic part 4 of the tightening device 1 can be moved to the position of the indexing device 6. The recess 61 on the indexing device 6 facilitates the rotation of the telescopic part 4 and the support part 3 as a whole around the structure in which the telescopic part 4 is disposed in the recess 61.

[0079] In this embodiment, the tightening device 1 further includes a bearing 7, which is fixed in the recess 61. One end of the telescopic part 4 is connected to the support part 3, and the other end of the telescopic part 4 is disposed in the inner ring of the bearing 7. The bearing 7 facilitates the rotation of the support part 3 and the telescopic part 4 as a whole around the bearing 7 during the tightening process, reducing axial pressure and radial friction. As shown in the figure, the bearing 7 in this embodiment is a rolling bearing 7, and a rolling bearing 7 is disposed at the torque input rod 422. Figure 2 As shown, the inner ring of the bearing 7 is fixed to the lower end of the rod 422, while the outer ring of the bearing 7 can rotate freely. In this example, the rolling bearing 7 is a deep groove ball bearing 7, which can withstand both axial and radial forces. When the operator operates the torque wrench to input torque, both axial and radial pressures are generated simultaneously. The rolling bearing 7 is used to reduce the frictional force generated by these axial and radial pressures. This further reduces torque transmission losses and ensures the authenticity of the tightening torque.

[0080] In this embodiment, the recess 61 is a second through hole 625, and one end of the telescopic part 4 disposed in the recess 61 is engaged with the second through hole 625. The telescopic part 4 is engaged with the through hole, which facilitates the telescopic part 4 to extend and retract along its own axis during the tightening process of the tightening device 1, and also facilitates the telescopic part 4 to move out of the second through hole 625 when the tightening device 1 needs to move its position.

[0081] Specifically, the indexing device 6 is an indexing plate 60, and the second through holes 625 are evenly distributed along the circumference of the indexing plate 60. By using the evenly distributed second through holes 625 along the indexing plate 60, the tightening device 1 can be used with equipment requiring uniform installation of fasteners 8. A rolling bearing 7 is installed between the rod 422 of the tightening device 1 and the indexing plate 60 to reduce the friction generated at the limiting shaft during tool rotation, further improving torque transmission efficiency. The second through holes 625 on the indexing plate 60 are stepped holes, evenly distributed circumferentially, the same number as the rotor connecting nuts. The stepped holes are coaxial with the nuts to be tightened and mate with the outer ring of the rolling bearing 7. The indexing device 6 is fixed at the rear shaft of the rotor, achieving the positioning of the entire device.

[0082] The steps for using the tightening device 1 in this embodiment are as follows:

[0083] Step 1: Tightening device 1 is located outside the rotor, with the input end of the C-wrench in its initial state, such as... Figure 6 As shown; the nut is manually tightened into the bolt until it enters the self-locking thread section; the indexing device 6 is fixed at the rear end of the rotor. Second step: Press and rotate the rod 422 to make the connecting piece 5 engage in the first groove 412. At this point, the rod 422 is furthest from the ratchet head 13, and will not interfere when placed inside the rotor. Figure 7 As shown. Step 3: Insert the tightening tool diagonally into the rotor, as shown. Figure 8 As shown; Step 4: The rolling bearing 7 is embedded in the second through hole 625, and the ratchet head 13 is located on the underside of the nut, as shown. Figures 9a-9c As shown. Step 5: Press the input shaft 12 against the wall and rotate the connecting piece 5 and the rod 422, so that the connecting piece 5 enters the first groove 412. Under the action of the spring, the C-type wrench rises upward, and the ratchet head 13 engages with the nut, as shown. Figure 10 As shown. Step 6: Rotate the C-shaped wrench forward and reverse. The ratchet head 13 drives the nut to tighten. During the tightening process, the nut is displaced upward, the spring continues to rise, and the connecting piece 5 moves within the first groove 412. The ratchet head 13 remains in contact with the nut. Step 7: When the connecting piece 5 reaches the bottom of the first groove 412, as shown... Figure 11 There is a small gap between the nut and the rotor end face; continue to tighten the nut, the nut moves up and touches the rotor end face, the ratchet head 13 and the nut are still within the engagement range, at this time the spring force no longer works, no extra axial clamping force is generated on the nut, ensuring the final tightening torque, and completing the application of the final tightening torque.

[0084] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A tightening device, characterized in that The tightening device includes: A clamping part, the clamping part being used to clamp fasteners; The fastener includes a support portion and a telescopic portion. One end of the support portion is fixedly connected to the clamping portion, and the other end of the support portion is connected to the telescopic portion. The telescopic direction of the telescopic portion is parallel to the moving direction of the fastener. The telescopic part is configured to extend and retract when the fastener rotates along its own axis so that the clamping part and the fastener always remain in a clamping state. The telescopic part includes a sleeve and a movable part. One end of the movable part is disposed outside the sleeve, and the other end of the movable part is disposed inside the sleeve, and the movable part is movable relative to the sleeve. The tightening device also includes a connector, the sleeve has a groove on its outer side, the moving part has a first through hole, the connector passes through the first through hole and the groove, and the moving part moves to allow the connector to slide in the groove; The groove is provided with a first groove and a second groove, which are connected to each other. The extension direction of the first groove is parallel to the movement direction of the moving part, and the extension direction of the second groove is at an angle to the extension direction of the first groove. When the tightening device tightens the fastener, the connector moves within the first groove along the extension and retraction direction of the telescopic part; When the tightening device tightens the fastener into place, the connector can slide from the first slot to the second slot.

2. The tightening device according to claim 1, characterized in that The moving part includes an elastic element and a rod. One end of the rod is disposed outside the sleeve, and the other end of the rod is disposed inside the sleeve and abuts against one end of the elastic element. The other end of the elastic element abuts against the inner wall of the sleeve along the moving direction of the moving part.

3. The tightening device of claim 1, wherein The second groove and the first groove are L-shaped as a whole.

4. The tightening device as described in claim 1, characterized in that, The tightening device also includes an indexing device, which has a recess. One end of the telescopic part is connected to the support part, and the other end of the telescopic part is disposed in the recess.

5. The tightening device as described in claim 4, characterized in that, The tightening device also includes a bearing, which is fixed in the recess. One end of the telescopic part is connected to the support part, and the other end of the telescopic part is disposed in the inner ring of the bearing.

6. The tightening device as described in claim 4, characterized in that, The recess is a second through hole, and one end of the telescopic part disposed in the recess is engaged with the second through hole.

7. The tightening device as described in claim 6, characterized in that, The indexing device is an indexing disk, and the second through holes are evenly distributed along the circumferential direction on the indexing disk.

Images