An ultrasonic-assisted disassembly of threaded pair device

Abstract

The application relates to an ultrasonic auxiliary dismounting threaded pair device and belongs to the technical field of aviation assembly. The device comprises a supporting module, a power module, a torque transmission module and an output module, the main structure of the torque transmission module is a middle shaft, the middle shaft is assembled from top to bottom by a middle shaft upper part, a middle shaft middle part and a middle shaft lower part, wherein the longitudinal ultrasonic transducer is arranged in the hollow middle shaft middle part and is fixed with the upper plane of the middle shaft lower part; the outer surface of the middle shaft middle part is provided with two symmetrical side ear planes, and two torsional ultrasonic transducers are fixed on the two side ear planes of the middle shaft middle part. The device has low material cost and simple manufacturing and processing technology. The device is convenient and fast to operate, small in size and convenient to carry.

Description

Technical Field

[0001] This invention relates to an ultrasonic-assisted disassembly device for threaded joints, belonging to the field of aerospace assembly technology. Background Technology

[0002] Modern aero gas turbine engines mostly adopt a modular structure design, with each unit assembled and combined through various connection methods, improving engine maintainability. Among commonly used connection structures, the "flange-bolt" connection structure is the most widely used, typically in applications such as between discs, between discs and shafts, and between drums and discs, and between drums and shafts in aero engine rotor systems. The "flange-bolt" connection structure not only causes discontinuities in the aero engine structure but also introduces nonlinear factors such as contact, friction, and preload. Bolts generate significant working stress in the aero engine's operating environment, directly leading to an increase in the decomposed torque and reducing the quality of engine connections. This results in the difficulty of disassembling threaded pairs under high stress.

[0003] Currently, the main disassembly methods for high-stress applications are oil immersion and destructive methods. For difficult-to-disassemble threaded pairs, kerosene or diesel oil is first used for overall immersion, followed by disassembly after a period of time. If disassembly still fails, the nut is finally drilled out for destructive removal. This results in low bolt recycling rates and causes some damage to the workpiece surface during disassembly. In engine disassembly, ensuring the quality of the threaded pairs is a prerequisite for high-quality reassembly. Therefore, reducing the thread disassembly torque and minimizing damage to the threaded contact surfaces are crucial for improving engine disassembly efficiency and reassembly quality. Summary of the Invention

[0004] To address the aforementioned issues, an application of ultrasonic vibration to a threaded pair disassembly device is proposed. Ultrasonic vibration possesses both friction-reducing and softening effects. The friction-reducing effect can decrease the disassembly torque to a certain extent, while the softening effect can effectively reduce surface damage to the threaded pair contact surfaces. Therefore, ultrasonic transducers are installed in the longitudinal and torsional directions of the device, respectively. Activating the ultrasonic device during threaded pair disassembly assists in the process, thereby reducing disassembly torque and damage to the threaded pair contact surfaces while improving disassembly efficiency and the quality of secondary assembly.

[0005] The purpose of this invention is to solve the problem of difficult disassembly of threaded pairs due to high preload during the disassembly of aircraft engines, and to design a disassembly device that reduces disassembly torque and surface damage to the contact surfaces of the threaded pairs.

[0006] An ultrasonic-assisted disassembly device for threaded joints includes a support module, a power module, a torque transmission module, and an output module. The main structure of the torque transmission module is a central shaft, which is assembled from top to bottom into three components: an upper central shaft, a middle central shaft, and a lower central shaft.

[0007] The longitudinal ultrasonic transducer is placed in the middle of the hollow central shaft and fixed to the upper plane of the lower part of the central shaft; the outer surface of the central shaft is provided with two symmetrically arranged side ear planes, and the two torsional ultrasonic transducers are respectively fixed on the two side ear planes of the central shaft.

[0008] In the ultrasonic-assisted disassembly threaded assembly device of the present invention, the longitudinal ultrasonic transducer circuit is connected to the conductive slip ring through the through hole at the upper part of the central shaft, and the twisting ultrasonic transducer circuit is first connected to the conductive slip ring through the through holes on both sides of the middle part of the central shaft, and then through the through hole at the upper part of the central shaft; angular contact ball bearing I and angular contact ball bearing II are respectively fitted on the upper part and the lower part of the central shaft, respectively, with angular contact ball bearing I embedded in the bearing groove of the middle fixed plate and angular contact ball bearing II embedded in the bearing groove of the lower fixed plate.

[0009] In the ultrasonic-assisted disassembly device for threaded pairs described in this invention, a large gear is fitted into the upper part of the central shaft; the upper end of the quadrangular prism is inserted into the lower part of the central shaft, and the lower end is inserted into a replacement sleeve, thus forming an output module.

[0010] In the ultrasonic-assisted disassembly device for threaded pairs described in this invention, the support module includes an upper fixed plate, a middle fixed plate, and a lower fixed plate. Angle iron posts I and II located at the four corners of the support module fix the upper fixed plate, the middle fixed plate, and the lower fixed plate to form a frame structure. The front handle and the rear handle are respectively fixed to the lower fixed plate and the upper fixed plate.

[0011] In the ultrasonic-assisted disassembly threaded pair device of the present invention, the power module includes an AC motor, a pinion, and a conductive slip ring. The motor and the conductive slip ring are respectively connected to the upper fixed plate through the threaded pair. The pinion is connected to the output end of the motor. The conductive slip ring is electrically connected to the longitudinal ultrasonic transducer and the torsional ultrasonic transducer. The large gear and the pinion mesh with each other.

[0012] The beneficial effects of this invention are as follows: The device provided by this invention can not only be used for the disassembly of threaded pairs in various mechanical equipment such as aircraft engines, but also for the assembly of threaded pairs in various mechanical equipment. This device is easy to operate, labor-saving, and highly efficient, and can reduce surface damage to parts. The materials required for this device are inexpensive, and the manufacturing process is simple. The device is convenient and quick to operate, small in size, and easy to carry. Attached Figure Description

[0013] Figure 1 : Front view and cross-sectional view of the ultrasonic-assisted disassembly device for threaded joints described in this invention.

[0014] Figure 2 : Exploded view of the central axis of the ultrasonic-assisted disassembly device for threaded parts described in this invention.

[0015] Figure 3: Axonometric view of the ultrasonic-assisted disassembly device for threaded joints described in this invention.

[0016] Figure 4 : Front view of the ultrasonic-assisted disassembly device for threaded joints described in this invention.

[0017] Figure 5 : A top view of the ultrasonic-assisted disassembly device for threaded joints described in this invention. Figure 1 It is based on Figure 5 The AA section was viewed.

[0018] Figure 6 : A bottom view of the ultrasonic-assisted disassembly device for threaded joints described in this invention.

[0019] Figure 7 : Front view of the central axis of the ultrasonic-assisted disassembly device for threaded joints described in this invention.

[0020] Figure 8 : A bottom view of the central axis of the ultrasonic-assisted disassembly device for threaded joints described in this invention.

[0021] Figure 9 The left sectional view of the central axis of the ultrasonic-assisted disassembly threaded assembly device of the present invention is shown below. Figure 8 The BB was dissected.

[0022] In the diagram: 1-AC motor, 2-conductive slip ring, 3-rear handle, 4-upper fixed plate, 5-angle iron post I, 6-middle fixed plate, 7-angle iron post II, 8-lower fixed plate, 9-front handle, 10-quadrangular prism, 11-quick-change sleeve; 12-pinion, 13-gear, 14-angular contact ball bearing I, 15-upper part of central shaft, 16-longitudinal ultrasonic transducer, 17 middle part of central shaft, 18-torsional ultrasonic transducer, 19-lower part of central shaft, 20-angular contact ball bearing II. Detailed Implementation

[0023] This invention develops an ultrasonic-assisted device for disassembling threaded pairs, which reduces disassembly torque and surface damage to the threaded pair contact surfaces during disassembly. The device comprises four modules: a support module, a power module, a torque transmission module, and an output module, the combination of which is shown in the accompanying drawings. Figure 1 and Figure 2 To make the objectives, features, and advantages of the technical solution proposed in this invention more apparent and understandable, the embodiments of the technical solution proposed in this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the proposed technical solution, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0024] An ultrasonic-assisted disassembly device for threaded pairs includes a support module, a power module, a torque transmission module, and an output module. The support module runs the length of the device, with three fixed plates from top to bottom: the first fixed plate secures the motor and conductive slip ring, and a gear set consisting of large and small gears connects the motor output end and the upper part of the central shaft; the second and third fixed plates, through fixed bearings, further secure the central shaft, restricting its five degrees of freedom while retaining axial rotational freedom, and bonding longitudinal and torsional ultrasonic transducers to the central shaft, with the wiring ends connected to the conductive slip ring to achieve ultrasonic vibration assistance; the fixed plates are spaced apart by angle iron posts, with the rear handle aligned with the first fixed plate and the front handle aligned with the third fixed plate, and the threaded pair used for secure connection; finally, a square prism is inserted into the square hole at the bottom of the central shaft, and a quick-change sleeve is inserted into the square hole at the top of the prism. This completes the overall design and assembly process. During operation, the appropriate quick-change sleeve is selected according to the nut model of the threaded pair, aligned with the nut, and the motor and conductive slip ring are energized to disassemble the threaded pair.

[0025] Example 1

[0026] An ultrasonic-assisted disassembly device for threaded joints includes a support module, a power module, a torque transmission module, and an output module.

[0027] The support module includes an upper fixing plate 4, a middle fixing plate 6, a lower fixing plate 8, angle iron columns I5 and II7, a front handle 9, and a rear handle 3. It forms the frame of the entire device and serves to fix the power module, torque transmission module, and output module.

[0028] The power module includes an AC motor 1, a pinion gear 12, and a conductive slip ring 2. The motor 1 and the conductive slip ring 2 are connected to the upper fixing plate 4 via threaded connections. The pinion gear 12 is connected to the motor output. The conductive slip ring 2 provides power to the longitudinal ultrasonic transducer 16 and the torsional ultrasonic transducer 18, while also solving the problem of wire entanglement in the ultrasonic transducers during operation.

[0029] The torque transmission module includes a large gear 13, an angular contact ball bearing I14, an angular contact ball bearing II20, an upper part of the central shaft 15, a middle part of the central shaft 17, a lower part of the central shaft 19, a longitudinal ultrasonic transducer 16, and a torsional ultrasonic transducer 18. The longitudinal ultrasonic transducer 16 is bonded to the plane of the lower part 19 of the central shaft, and the lateral ultrasonic transducer 18 is bonded to the two side ear planes of the middle part 17 of the central shaft. The line of the longitudinal ultrasonic transducer 16 is connected to the conductive slip ring 2 through the through hole of the upper part 15 of the central shaft. The line of the lateral ultrasonic transducer 18 first passes through the through holes on both sides of the middle part 17 of the central shaft, and then through the through hole of the upper part 15 of the central shaft to connect to the conductive slip ring 2 to realize the power supply of the transducer. The upper part 15 of the central shaft is connected to the middle part 17 of the central shaft, and the middle part 17 of the central shaft is connected to the lower part 19 of the central shaft with a threaded pair. Angular contact ball bearing I14 and angular contact ball bearing II20 are respectively fitted on the upper part 15 of the central shaft and the lower part 19 of the central shaft. The angular contact ball bearing I14 is embedded in the bearing groove of the middle fixing plate 6, and the angular contact ball bearing II20 is embedded in the bearing groove of the lower fixing plate 8.

[0030] Fit the large gear 13 into the upper shaft of the central shaft 15. Connect the rear handle 3, upper fixing plate 4, angle iron column I5, middle fixing plate 6, and upper ends of angle iron column II7 through threaded connections. Connect the lower end of angle iron column II7, lower fixing plate 8, and front handle 9 through threaded connections. At this point, the basic assembly of the device is complete.

[0031] Finally, complete the output module by inserting the quadrangular prism 10 into the lower part 19 of the central shaft and inserting the quick-change sleeve 11 into the quadrangular prism 10.

[0032] During operation, hold the front handle 9 and the rear handle 3 with both hands respectively, align the quick-change sleeve 11 with the nut, and energize the AC motor 1 and the conductive slip ring 2 to disassemble the threaded pair.

[0033] Experimental verification proved that the disassembly device designed in this invention is feasible and can reduce disassembly torque and surface damage to the threaded pair contact surface to a certain extent.

[0034] Matters not covered in this invention are common knowledge. Furthermore, it should be understood that the above-described embodiments are only used to explain the invention in detail, but the invention is not limited to the detailed methods described above. For those skilled in the art, any improvements to the invention, equivalent substitutions of raw materials for the product, selection of specific methods, etc., within the spirit and principles of the invention, should be covered within the scope of protection and disclosure of this invention.

Claims

1. An ultrasonic assisted disassembly of threaded pair device, characterized by: The device comprises a support module, a power module, a torque transmission module and an output module, the torque transmission module is a middle shaft, the middle shaft is assembled from top to bottom by a middle shaft upper part (15), a middle shaft middle part (17) and a middle shaft lower part (19), wherein, A longitudinal ultrasonic transducer (16) is placed in the hollow middle shaft middle part (17) and fixed to the upper plane of the middle shaft lower part (19); the outer surface of the middle shaft middle part (17) is provided with two side ear planes arranged symmetrically, and two torsional ultrasonic transducers (18) are respectively fixed to the two side ear planes of the middle shaft middle part (17).

2. The apparatus of claim 1, wherein: The longitudinal ultrasonic transducer (16) line is connected to the conductive slip ring (2) through the through hole of the middle shaft upper part (15), and the torsional ultrasonic transducer (18) line is first connected to the conductive slip ring (2) through the through hole on the two sides of the middle shaft middle part (17) and then through the through hole of the middle shaft upper part (15); angular contact ball bearings I (14) and angular contact ball bearings II (20) are respectively sleeved on the middle shaft upper part (15) and the middle shaft lower part (19), the angular contact ball bearings I (14) are embedded in the bearing grooves of the middle fixed plate (6), and the angular contact ball bearings II (20) are embedded in the bearing grooves of the lower fixed plate (8).

3. The apparatus of claim 1, wherein: The large gear (13) is sleeved on the upper end shaft of the middle shaft upper part (15); the upper end of the four-prism (10) is inserted into the middle shaft lower part (19), and the lower end is inserted into the sleeve (11), forming an output module.

4. The apparatus of claim 1, wherein: The support module comprises an upper fixed plate (4), a middle fixed plate (6) and a lower fixed plate (8), the angle iron column I (5) and the angle iron column II (7) located at the four corners of the support module fix the upper fixed plate (4), the middle fixed plate (6) and the lower fixed plate (8) to form a frame structure; the front handle (9) and the rear handle (3) are respectively fixed to the lower fixed plate (8) and the upper fixed plate (4).

5. The apparatus of claim 1, wherein: The power module comprises an alternating current motor (1), a pinion (12) and a conductive slip ring (2), the motor (1) and the conductive slip ring (2) are respectively connected to the upper fixed plate (4) through a threaded pair, the pinion (12) is connected to the motor output end, the conductive slip ring (2) is electrically connected to the longitudinal ultrasonic transducer (16) and the torsional ultrasonic transducer (18); the large gear (13) and the pinion (12) are engaged with each other.

Images