CN217861016U - Screwing device - Google Patents

Abstract

The utility model provides a revolve and twist device for revolve twist and install the nut at axle type part. The shaft parts are provided with connecting holes which are uniformly distributed in the circumferential direction, and the nuts comprise connecting structures which are centrosymmetric. The screwing device comprises a transmission device and a supporting and positioning device; in a rotor part of the transmission device, the axis of the inner circular surface is collinear with the rotation axis of the torque output interface, a first connecting part is used for being in transmission connection with a connecting structure of a nut, the first connecting part is of a central symmetry structure, and the symmetry center is positioned on the axis of the inner circular surface; the top supporting structure of the supporting and positioning device is connected with the stator part of the transmission device in a rotation-proof way; in the centering back shaft that supports positioner, the top is connected with top bearing structure, and first flange is located between top and the bottom, and the outer disc and the interior disc transition fit of first flange, the axis of outer disc and the axis collineation of centering back shaft, the second flange is located the bottom, including circumference evenly distributed's mounting hole, the mounting hole is used for being connected with the connecting hole.

Description

Screwing device

Technical Field

The utility model relates to an aeroengine assembles technical field, concretely relates to revolve and twist device.

Background

The aircraft engine assembly technology involves the installation and the disassembly of a large number of special nuts with complex structures, and whether the special nuts are installed in place plays a crucial role in the operation safety of the engine. The tightening torque of these nuts is large, and the nuts cannot be tightened directly by hand, and the torque is very strict during the tightening or loosening process, so that a special screwing device needs to be designed for operation. For example, when a compression nut of a high-pressure rotor is screwed, thousands of newton meters of torque are required to be input to ensure that the screw nut is pressed, and when the torque is input to the nut, an equivalent counter-torque force is also required to be provided.

The inventor is accomplishing the utility model discloses an in-process discovery, current wrong device that revolves exists that positioning accuracy is lower, moment transmission error is great scheduling problem, consequently, needs a new wrong device of revolving, can realize accurate location and the accurate transmission of moment to satisfy aeroengine's assembly and decompose the requirement.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a revolve and twist device can realize accurate location and the accurate transmission of moment.

The screwing device is used for screwing a nut installed on a shaft part, a plurality of circumferentially uniformly distributed connecting holes are formed in the end face of the shaft part, the nut comprises a connecting structure with central symmetry, the center of symmetry of the connecting structure is located on the axis of the nut, the screwing device comprises a transmission device and a supporting and positioning device, the transmission device comprises a stator part and a rotor part, the rotor part comprises a torque output interface, an inner circular surface and a first connecting part, the axis of the inner circular surface is collinear with the rotation axis of the torque output interface, the first connecting part is used for being in transmission connection with the connecting structure of the nut, the first connecting part is of a central symmetry structure, and the center of symmetry is located on the axis of the inner circular surface; the supporting and positioning device comprises a top supporting structure and a centering supporting shaft, the top supporting structure is connected with the stator piece in a rotation-proof mode, the centering supporting shaft comprises a top end, a bottom end, a first flange and a second flange, and the top supporting structure comprises a top end, a bottom end, a first flange and a second flange, wherein: the top end is connected with the top support structure; the first flange is positioned between the top end and the bottom end, the outer circular surface of the first flange is in transition fit with the inner circular surface, and the axis of the outer circular surface is collinear with the axis of the centering support shaft; the second flange is located the bottom, the second flange includes around the axis circumference evenly distributed's of centering back shaft a plurality of mounting holes, the mounting hole be used for with the connecting hole is connected.

In one or more embodiments of the screwing device, the stator member includes a housing, the top support structure includes a first support member, a connecting rod, and a support seat, the first support member is detachably connected to the centering support shaft, the support seat is connected to a lower side of the first support member through the connecting rod, and the support seat is configured to cooperate with a mounting end surface of the housing to support the stator member.

In one or more embodiments of the screwing device, an end cover is connected to the top end of the centering support shaft, the first support member is detachably connected to the end cover, the support positioning device further includes a second support member detachably connected to a radial outer side of the centering support shaft, and the second support member is disposed between the first support member and the housing and has a longitudinal gap with the first support member or the housing.

In one or more embodiments of the screwing device, the stator member includes a plurality of positioning pins, the first support member includes a plurality of positioning pin holes, the plurality of positioning pins correspond to the plurality of positioning pin holes one to one, and the positioning pins are in transition fit with the positioning pin holes.

In one or more embodiments of the screwing device, the first support member further includes a plurality of threaded holes, the plurality of threaded holes correspond to the plurality of positioning pin holes one to one, one end of each threaded hole is perpendicular to and communicates with the corresponding positioning pin hole, the other end of each threaded hole is located on the outer surface of the first support member, the top support structure further includes a plurality of tightening pins, and the plurality of tightening pins are in one-to-one threaded connection with the plurality of threaded holes, so that one end of each tightening pin can tighten against the positioning pin.

In one or more embodiments of the screwing device, the connecting rod comprises a threaded section for threaded connection with the first support.

In one or more embodiments of the screwing device, the top support structure further includes a plurality of pulling assemblies respectively connected to different portions of the upper surface of the first support.

In one or more embodiments of the screwing device, the torque amplification device includes a through hole, the through hole penetrates through the housing, the through hole includes a first hole and a second hole which are coaxial, the torque output interface is arranged on the inner side face of the second hole, and the cross section of the first hole is larger than that of the second hole.

In one or more embodiments of the screwing device, the transmission device includes a torque amplification device, which provides the torque output interface, and a torque transmission device, which provides the inner circumferential surface and the first connection portion, and is in transmission connection with the torque amplification device.

In one or more embodiments of the screwing device, the torque transmission device includes a hollow shaft, the first connection portion and the second connection portion are respectively located on two axial sides of the hollow shaft, and an inner hole of the hollow shaft provides the inner circular surface.

In one or more embodiments of the screwing device, a side wall of the hollow shaft is provided with an opening which extends through the side wall.

In one or more embodiments of the screwing device, the torque amplification device is a torque multiplier.

In one or more embodiments of the screwing device, the connecting structure includes clamping grooves uniformly distributed in the circumferential direction, the first connecting portion includes clamping teeth uniformly distributed in the circumferential direction around the axis of the inner circular surface, and the clamping teeth correspond to the clamping grooves in a one-to-one manner and are used for being inserted into the clamping grooves.

In one or more embodiments of the screwing device, a protrusion is formed between adjacent clamping grooves of the connecting structure, an end of the protrusion provides a first end surface, the first end surfaces are coplanar and perpendicular to the axis of the nut, a groove is formed between adjacent clamping teeth of the first connecting part, a bottom of the groove provides a second end surface, and the second end surfaces are coplanar and perpendicular to the axis of the inner circular surface.

In one or more embodiments of the screwing device, the shaft part comprises a first cylindrical surface, the axis of the first cylindrical surface is collinear with the axis of the shaft part, the bottom end of the centering support shaft comprises a second cylindrical surface, the axis of the second cylindrical surface is collinear with the axis of the centering support shaft, and the second cylindrical surface is used for transition fit with the first cylindrical surface.

The screwing device can support and position the transmission device by adopting the supporting and positioning device, can ensure accurate positioning by arranging a plurality of centering matching structures, enables torque to be stably transmitted without loss, can enable the screwing device to be in a reasonable spatial position relative to the shaft parts and the nuts, and ensures enough assembly space and screwing operation space. The screwing device has the advantages of fewer parts, simple and compact structure, easiness in processing, manufacturing and assembling, convenience in operation, capability of being quickly installed in a small space, improvement in screwing efficiency and improvement in comfort level of operators.

Drawings

The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings. It is to be noted that the figures are given by way of example only and are not to scale, and that the scope of protection of the invention as claimed in practice should not be limited thereby, and that components having similar relative characteristics or features may have the same or similar reference numerals.

Fig. 1 shows a perspective view of a screwing device.

Fig. 2 shows a cross-sectional schematic view of the screwing device.

Figure 3 shows a perspective view of the top support means connected to the intermediate centring means.

Figure 4 shows a schematic view in partial cross section of the top support means connected to the intermediate centring means.

Fig. 5 shows a partial schematic view of an intermediate centering device.

Fig. 6 shows a schematic view of the connection of the screwing device to the shaft part.

Fig. 7 shows a schematic view of a torque amplification device.

Fig. 8 shows a schematic view of a torque transmission device.

Detailed Description

The following discloses a variety of different implementation or examples implementing the subject technology. Specific examples of components and arrangements are described below to simplify the disclosure, but are by way of example only and are not limiting as to the scope of the invention. Furthermore, certain features, structures, or characteristics may be combined as suitable in one or more embodiments of the application.

Referring to fig. 1 to 8, a screwing device 1 according to an embodiment of the present invention is used for screwing a nut 3 installed on an axis part 2, the axis part 2 is, for example, a high-pressure rotor shaft of an aircraft engine, a labyrinth plate 4 is installed at an end 21 of the axis part 2, and the nut 3 is in threaded connection with the axis part 2 for compressing the labyrinth plate 4.

The screwing device 1 comprises a transmission device 5 and a supporting and positioning device 6. The transmission device 5 comprises a stator part and a rotor part, the rotor part is used for being in transmission connection with the nut 3, the output torque drives the nut 3 to rotate, the nut 3 is unscrewed or screwed, and the stator part is used for being connected with the supporting and positioning device 6.

The supporting and positioning device 6 is respectively connected with the transmission device 5 and the shaft part 2, and the supporting and positioning device 6 is used for supporting the transmission device 5, ensuring the accurate positioning of the transmission device 5 and transmitting the reaction torque opposite to the screwing torque direction. During the process of screwing the nut 3 by the screwing device 1, the shaft part 2 and the supporting and positioning device 6 are kept static, the shaft part 2 and the nut 3 receive the torque applied by the transmission device 5 on one hand and provide a reaction torque opposite to the screwing direction to the supporting and positioning device 6 on the other hand, and the supporting and positioning device 6 transmits the reaction torque to the transmission device 5 so as to keep the stress balance of the transmission device 5.

The transmission 5 comprises a torque amplification device 51 and a torque transmission device 52. The torque amplifying device 51 is used for amplifying the manually input torque to reduce the labor intensity of the operator or meet the torque requirement that the operator cannot complete the torque directly by manpower. The torque transmission device 52 is in transmission connection with the torque amplification device 51 and the nut 3 respectively.

The torque transmission device 52 is used for transmitting the torque output by the torque amplification device 51 to a target position, and by replacing the torque transmission device 52 with different specifications, the screwing device 1 can be suitable for the torque amplification devices 51 with different specifications or/and nuts 3 with different specifications, and can also be suitable for different distance requirements between the torque amplification device 51 and the nuts 3 under different use environments, so as to improve the universality of the screwing device 1.

Optionally, the torque amplification device 51 adopts a torque multiplier, the torque multiplier amplifies the torque through a reduction gear device, the structure is compact, the technology is mature and reliable, and the existing product can be purchased by a supplier, so that the design and manufacturing difficulty of the screwing device 1 is reduced, and the manufacturing period is shortened.

The torque amplification device 51 comprises a torque input interface 511, a torque output interface 512 and a housing 513. The housing 513 is a component of the stator member, the torque input interface 511 and the torque output interface 512 are components of the rotor member, and the torque input interface 511 and the torque output interface 512 are rotatably disposed in the housing 513.

The torque input interface 511 is used for inputting torque, for example, the torque input interface 511 is a hexagonal inner hole so as to be suitable for a conventional torque adapter. The input torque is converted from the transmission ratio, and assuming that the required output torque is N _ output and the transmission ratio is i _ ratio, the input torque is N _ output/i _ ratio. The torque output interface 512 is used for outputting the amplified torque, and the torque output interface 512 is in transmission connection with the torque transmission device 52.

The torque transfer device 52 includes a first connection portion 521, a second connection portion 522, and an inner circumferential surface 523. The first connecting portion 521 is used for being in transmission connection with the nut 3, and the second connecting portion 522 is used for being in transmission connection with the torque output interface 512. The inner surface 523 has a high degree of roundness for cooperation with the support and positioning means 6, as will be described in detail later.

The support and positioning means 6 comprise a top support structure 7 and intermediate centring means 8. The top supporting structure 7 is connected to the housing 513 of the torque amplifying device 51 in a rotation-proof manner, and is used for supporting the torque amplifying device 51 and positioning the transmission device 5 in cooperation with the centering supporting shaft 81, which will be described in detail later. The intermediate centering device 8 comprises a centering support shaft 81, the centering support shaft 81 comprising a top end 811, a bottom end 812, a first flange 813 and a second flange 814. The top end 811 and the bottom end 812 are respectively located at the two axial ends of the centering support shaft 81, the top end 811 is connected with the top support structure 7, and the bottom end 812 is used for being connected to the end 21 of the shaft part 2.

Therefore, the top support structure 7 and the moment amplifying device 51 are supported above the shaft part 2 through the centering support shaft 81, so that the screwing device 1 can be conveniently connected with the shaft part 2 and the nut 3, and the distance between the top support structure 7 and the moment amplifying device 51 and the end part 21 of the shaft part 2 is pulled, so that the method is suitable for the condition that the space near the end part 21 and the nut 3 is small, and the screwing device 1 can be conveniently installed and screwing operation is conveniently carried out.

In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the orientation words such as "upper", "lower", "top", "bottom", "vertical", "longitudinal", etc. is generally based on the orientation or positional relationship when screwing the nut 3, that is, the orientation or positional relationship shown in fig. 1 to 6.

The top support structure 7 comprises a first support 71, a connecting rod 72, a support seat 73 and a lifting assembly 74, the first support 71 is detachably connected to a top end 811 of the centering support shaft 81, the support seat 73 is connected to a lower side of the first support 71 through the connecting rod 72, and an upper end surface 731 of the support seat 73 is used for cooperating with a mounting end surface 516 of a housing 513 of the moment amplifying device 51 to support and lift the moment amplifying device 51.

Thus, the top support structure 7 and the torque amplifying device 51 form an assembly for facilitating the movement of the torque amplifying device 51 and the assembly of the screwing device 1, and the first support 71 is located on the top of the top support structure 7 so that the connection point of the top support structure 7 and the centering support shaft 81 is away from the end 21 of the shaft part 2, and sufficient operating space can be secured for facilitating the assembly.

The upper surface of the housing 513 of the torque amplifying device 51 is provided with a plurality of positioning pins 517, the first support member 71 includes a plurality of positioning pin holes 711, and the plurality of positioning pins 517 are inserted into the plurality of positioning pin holes 711 in a one-to-one correspondence, so as to connect the housing 513 and the first support member 71 in a rotation-proof manner. The positioning pin 517 serves to position the relative position of the torque amplifying device 51 with respect to the top support structure 7 to ensure accurate transmission of the screwing torque, and at the same time serves to transmit a reaction torque in a direction opposite to the screwing torque to maintain the force balance of the torque amplifying device 51.

The fit between the locating pin 517 and the locating pin hole 711 is a transition fit, which should be a small gap after the finished product is machined, to ensure that the locating pin 517 can be smoothly inserted into the locating pin hole 711, while ensuring the position requirement of the torque amplification device 51 relative to the top support structure 7.

The first support 71 further includes a plurality of threaded holes 712, the plurality of threaded holes 712 correspond to the plurality of positioning pin holes 711 one to one, one end of each threaded hole 712 is perpendicular to and communicates with the corresponding positioning pin hole 711, and the other end of the threaded hole 712 is located on the outer surface of the first support 71.

The top support structure 7 further includes a plurality of tightening pins 75, and the plurality of tightening pins 75 are screwed in the plurality of threaded holes 712 in one-to-one correspondence. One end of the knock-up pin 75 is used to knock up the positioning pin 517 of the housing 513 to lock the relative position of the torque amplification device 51 with respect to the top support structure 7, and the other end of the knock-up pin 75 protrudes out of the outer surface of the first support member 71 and is provided with a knob 751, the surface of the knob 751 is knurled to increase the friction force, thereby facilitating the manual force to screw the knock-up pin 75.

Optionally, the housing 513 of the torque amplification device 51 is further provided with a handrail 514, and the handrail 514 is used for assisting in adjusting the spatial position of the torque amplification device 514 when the torque amplification device 51 is initially placed.

The first supporting member 71 is a plate-shaped structure to simplify the structure of the first supporting member 71, and facilitate the manufacturing process. The first support 71 is provided with a weight-reduction opening 710 therethrough.

The lower end 721 of the connecting rod 72 is connected with the supporting seat 73, the upper end 722 of the connecting rod 72 includes a threaded section 723, the threaded section 723 is used for being in threaded connection with the first supporting member 71, so that assembly is facilitated, the distance between the torque amplifying device 51 and the end 21 of the shaft part 2 can be adjusted, the torque amplifying device is suitable for different use environments, and the universality of the screwing device 1 is improved.

A plurality of pulling assemblies 74 are attached to the upper side of the first support 71, distributed at different locations on the upper surface of the first support 71, to facilitate pulling and moving the top support structure 7 and the moment amplifying device 51 by the pulling assemblies 74. The number and location of the pull assemblies 74 may be designed based on the structural size, center of gravity location, weight, etc. of the assembly formed by the top support structure 7 and the torque amplification device 51.

Each lifting assembly 74 comprises a lifting ring 741, a lifting seat 742 and a connecting screw 743, wherein the lifting ring 741 is connected to the lifting seat 742, the lifting seat 742 is connected to the first support 71 through the connecting screw 743, and the lifting seat 742 can increase the force bearing area during lifting to improve the strength.

The strength of the pulling assembly 74 needs to be subjected to simulation calculation, meanwhile, the pulling assembly is subjected to a load test, after pulling, cracks of the pulling ring 741, the pulling seat 742 and the connecting screw 743 are detected through fluorescence detection, if the detection result has cracks, the load calculation needs to be carried out again, the test and the detection need to be carried out again, and the structural dimensions or/and the materials of the pulling ring 741, the pulling seat 742 and the connecting screw 743 are determined repeatedly and iteratively.

The top end 811 of the centering support shaft 81 is detachably attached with an end cap 85, and the first support 71 is detachably attached to the lower side of the end cap 85 by a bolt 86, the axis of the bolt 86 being parallel to the axis of the centering support shaft 81, for easy assembly. The tensile strength of the bolts 86 needs to be calculated and checked, the check result must meet the requirement of being able to support the weight of the top support structure 7 and the torque amplification device 51, and if the check result does not meet the requirement, the bolts 86 need to be replaced, and the structure or/and the material of the bolts 86 need to be changed.

The middle centering device 8 further comprises a second support 82, the second support 82 is arranged between the first support 71 and the housing 513 of the moment amplifying device 51, a longitudinal gap is reserved between the second support 82 and the first support 71 or the housing 513, the second support 82 is detachably connected with the centering support shaft 81 and is sleeved on the radial outer side of the centering support shaft 81, so that the top support structure 7 and the moment amplifying device 51 can be temporarily supported by the second support 82 before the first support 71 is connected with the end cover 85, the top support structure 7 can be conveniently installed, and after the bolt 86 is tightened, the top support structure 7 is pulled upwards, and the top support structure 7 and the moment amplifying device 51 are supported by the bolt 86.

The centering support shaft 81 includes a first positioning portion, and the second support 82 includes a second positioning portion, for example, the first positioning portion is provided as a shoulder 819 of the centering support shaft 81, and the second positioning portion is provided as a stepped surface 821 of a stepped hole inside the second support 82, and when the roof support structure 7 and the moment amplifying device 51 are temporarily supported by the second support 82, the second support 82 can be prevented from moving downward by the first positioning portion cooperating with the second positioning portion.

In another embodiment, the first support 71 is attached to the upper side of the end cap 85, and the end cap 85 may support the top support structure 7 and the moment amplifying device 51 before the bolts 86 are tightened, so that the second support 82 may not be provided.

With continued reference to fig. 1 to 8, the first flange 813 is located between the top end 811 and the bottom end 812 of the centering support shaft 81, and the first flange 813 is integrally formed with the centering support shaft 81 to ensure that the axis of the outer circular surface 815 of the first flange 813 is collinear with the axis of the centering support shaft 81 and the outer circular surface 815 has better roundness.

The torque transmission device 52 is sleeved outside the first flange 813, and the transition fit between the inner circular surface 523 of the torque transmission device 52 and the outer circular surface 815 of the first flange 813 should be a small gap after the finished product is processed, so as to facilitate assembly, and ensure that the axis of the inner circular surface 523 is collinear with the axis of the outer circular surface 815, so as to ensure that the axis of the inner circular surface 523 is collinear with the axis of the centering support shaft 81. Optionally, the first flange 813 is provided with a plurality of lightening holes 816 to reduce the burden on the operator.

The second flange 814 is located at the bottom end 812 of the centering support shaft 81, the second flange 814 comprises a plurality of mounting holes 817 which are uniformly distributed in the circumferential direction of the axis of the centering support shaft 81, the end surface 22 of the shaft part 2 is provided with a plurality of connecting holes 23 which are uniformly distributed in the circumferential direction of the axis of the shaft part 2, the mounting holes 817 correspond to the connecting holes 23 one by one and are connected with each other through the positioning screws 91 and the nuts 92, so that the axis of the shaft part 2, the axis of the centering support shaft 81 and the axis of the inner circular surface 523 of the torque transmission device 52 are collinear, and accurate positioning of the transmission device 5 and accurate transmission of torque are ensured.

The tightening torque of the positioning screws 91 affects the relative position between the axis of the shaft part 2 and the axis of the centering support shaft 81, the tightening torque needs to be checked in terms of strength, the strength requirements of each part cannot be exceeded while the second flange 814 is attached to the end face 22 of the shaft part 2, the calculation process needs to be performed through a plurality of test verification iterations, then the optimal tightening torque is selected, and a plurality of positioning screws 91 are tightened in a crisscross manner during assembly. For the sake of viewing, fig. 6 is a schematic view with a part of the nut 92 removed, and in actual use, one nut 92 corresponds to each set screw 91.

The positioning screw 91 is provided with a clamping ring (not shown), the inner side of the clamping ring is arranged on the positioning screw 91, and the outer side of the clamping ring is clamped in a clamping ring groove (not shown) of the connecting hole 23, so that the positioning screw 91 can be ensured to extend out of the connecting hole 23 without falling off in a vertical state, and the assembly is convenient.

Optionally, the end 21 of the shaft part 2 is provided with an inner cylindrical surface 24 at a position close to the end face 22, the inner cylindrical surface 24 has good roundness, the axis of the inner cylindrical surface 24 is collinear with the axis of the shaft part 2, the bottom end 812 of the centering support shaft 81 includes an outer cylindrical surface 818, the outer cylindrical surface 818 has good roundness, the axis of the outer cylindrical surface 818 is collinear with the axis of the centering support shaft 81, and the outer cylindrical surface 818 is used for being inserted into the inner cylindrical surface 24, so that the connection between the screwing device 1 and the shaft part 2 is more stable, and the function of assisting positioning is achieved. The fit of the outer cylindrical surface 818 and the inner cylindrical surface 24 is a transition fit with a small gap, so that the outer cylindrical surface 818 is inserted into the inner cylindrical surface 24, and the axis of the outer cylindrical surface 818 and the axis of the inner cylindrical surface 24 are collinear, so that the axis of the shaft part 2, the axis of the centering support shaft 81 and the axis of the inner cylindrical surface 523 of the torque transmission device 52 are collinear, and the accurate positioning of the transmission device 5 and the accurate transmission of the torque are ensured.

The torque amplification device 51 includes a through hole 515, and the through hole 515 penetrates the housing 513 so as to fit the torque amplification device 51 on the radially outer side of the centering support shaft 81. The through bore 515 comprises a first bore 518 and a second bore 519 which are coaxial, the torque output interface 512 being provided on an inner side of the second bore 519, the second bore 519 being provided below the first bore 518 to facilitate connection of the torque conducting means 52, the first bore 518 having a cross-sectional dimension greater than the cross-sectional dimension of the second bore 519, for example the torque output interface 512 being an internal spline, the internal diameter of the first bore 518 being greater than the external diameter of the internal spline, thereby increasing the space between the first bore 518 and the torque conducting means 52 to facilitate assembly and to make room for torque transmission.

By positioning the torque amplifying device 51 and the top support structure 7, positioning the torque conducting device 52 and the centering support shaft 81, and positioning the top support structure 7 and the centering support shaft 81, it can be ensured that the axis of the inner circular surface 523 of the torque conducting device 52 is collinear with the rotation axis of the torque output interface 512, thereby ensuring accurate transmission of torque.

With continued reference to fig. 1 to 8, the first connecting portion 521 is a structure with central symmetry, and the center of symmetry is located on the axis of the inner circular surface 523, the nut 3 includes the connecting structure 31, the connecting structure 31 is a structure with central symmetry, and the center of symmetry is located on the axis of the nut 3. For example, the connecting structure 31 includes clamping grooves 311 uniformly distributed on the outer circumferential surface of the nut 3 in the circumferential direction, the first connecting portion 521 includes clamping teeth 524 uniformly distributed in the circumferential direction around the axis of the inner circumferential surface 523, and the clamping teeth 524 correspond to the clamping grooves 311 one to one and are used for being inserted into the clamping grooves 311, so that the connection between the first connecting portion 521 and the connecting structure 31 makes the rotation axis of the nut 3 and the axis of the nut 3, the axis of the inner circumferential surface 523 and the rotation axis of the torque output interface 512 collinear, so as to ensure that the torque is smoothly and accurately transmitted from the torque output interface 512 to the nut 3.

Optionally, the locking slot 311 is a rectangular slot or a trapezoidal slot, and the locking tooth 524 is a rectangular tooth or a trapezoidal tooth, so as to have higher strength, and the structure is simple, and is convenient to manufacture and assemble. The latch 524 should be calibrated for strength calculations to ensure that it can withstand the required torque without deforming. The strength checking method of the latch 524 needs to take material characteristics and matching relations into consideration at the same time, the checking method of the latch 524 needs to be verified through tests, fluorescence detection is used for carrying out nondestructive inspection on the end face and the side face of the latch 524 in the test verification process, the nondestructive inspection result needs to meet the requirement of measurement and detection, if unrecoverable damage such as cracks and dents occurs, structural optimization needs to be carried out, specific optimized dimensions can be guided through simulation analysis, and iterative test verification needs to be carried out again after the dimensions are optimized until the requirements are met.

The adjacent catching grooves 311 of the nut 3 form projections 312 therebetween, ends of the projections 312 provide first end surfaces 313, and the plurality of first end surfaces 313 are coplanar and perpendicular to the axis of the nut 3. Adjacent latches 524 of the first connection portion 521 form grooves 525 therebetween, the bottom of the grooves 525 providing second end surfaces 526, the second end surfaces 526 being coplanar and perpendicular to the axis of the inner circular surface 523. The length of the latch 524 is not greater than the depth of the slot 311, and the surface of the second end surface 526 is processed to ensure that the second end surface 526 can be effectively and uniformly attached to the first end surface 313 when the latch 524 is matched with the slot 311, so that the connection between the nut 3 and the first connection portion 521 is more stable, the transmission of torque is more stable, and the axial positioning function is achieved, so that the installation is facilitated.

Alternatively, the torque transmission device 52 includes a hollow shaft, the first connection portion 521 and the second connection portion 522 are respectively located at both axial sides of the hollow shaft, and the inner hole of the hollow shaft provides the inner circular surface 523, so that the structure of the torque transmission device 52 can be simplified to facilitate manufacturing and assembly.

Optionally, the side wall of the hollow shaft is provided with a plurality of circumferentially uniform openings 527, the openings 527 penetrate through the side wall of the hollow shaft to enable visualization of the inside of the screwing device 1 during screwing, for example, for observing screwing conditions of the nut 3, and the like, and the openings 527 also have a weight reduction effect to reduce the burden of an operator. The number and diameter of the openings 527 are set to meet both the space requirements for viewing and the strength requirements for screwing to ensure that the torque conducting device 52 does not experience torsional failure and shape distortion during torque conduction.

The screwing device 1 can support and position the transmission device 5 by adopting the supporting and positioning device 6, can ensure accurate positioning by arranging a plurality of centering matching structures, enables torque to be stably transmitted without loss, can enable the screwing device 1 to be in reasonable spatial positions relative to the shaft part 2 and the nut 3, and ensures enough assembly space and screwing operation space. The screwing device 1 is few in parts, simple and compact in structure, easy to machine, manufacture and assemble, convenient to operate, capable of being rapidly installed in a small space, capable of improving screwing efficiency and improving comfort level of operators.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention, all without departing from the content of the technical solution of the present invention, fall within the scope of protection defined by the claims of the present invention.

Claims (15)

1. The screwing device is used for screwing a nut arranged on a shaft part, the end face of the shaft part is provided with a plurality of connecting holes which are uniformly distributed in the circumferential direction, the nut comprises a connecting structure with symmetrical center, the symmetrical center of the connecting structure is positioned on the axis of the nut, the screwing device comprises a transmission device and a supporting and positioning device, and the screwing device is characterized in that,

the transmission device comprises a stator part and a rotor part, the rotor part comprises a torque output interface, an inner circular surface and a first connecting part, the axis of the inner circular surface is collinear with the rotation axis of the torque output interface, the first connecting part is used for being in transmission connection with the connecting structure of the nut, the first connecting part is in a central symmetry structure, and the symmetry center is positioned on the axis of the inner circular surface;

the supporting and positioning device comprises a top supporting structure and a centering supporting shaft, the top supporting structure is connected with the stator piece in a rotation-proof mode, the centering supporting shaft comprises a top end, a bottom end, a first flange and a second flange, and the top supporting structure comprises a top end, a bottom end, a first flange and a second flange, wherein:

the top end is connected with the top support structure;

the first flange is positioned between the top end and the bottom end, the outer circular surface of the first flange is in transition fit with the inner circular surface, and the axis of the outer circular surface is collinear with the axis of the centering support shaft;

the second flange is located the bottom, the second flange includes around the axis circumference evenly distributed's of centering back shaft a plurality of mounting holes, the mounting hole be used for with the connecting hole is connected.

2. The screwing apparatus according to claim 1, wherein the stator member includes a housing, the top support structure includes a first support member detachably connected to the centering support shaft, a connecting rod, and a support seat connected to a lower side of the first support member through the connecting rod, the support seat being adapted to cooperate with a mounting end surface of the housing to support the stator member.

3. The screwing apparatus according to claim 2, wherein an end cap is attached to the top end of the centering support shaft, the first support member being detachably attached to the end cap, the support positioning apparatus further comprising a second support member detachably attached to a radially outer side of the centering support shaft, the second support member being disposed between the first support member and the housing with a longitudinal gap therebetween.

4. The screwing apparatus according to claim 2 or 3, wherein the stator member includes a plurality of dowel pins, the first support member includes a plurality of dowel pin holes, the plurality of dowel pins correspond one-to-one to the plurality of dowel pin holes, and the dowel pins are in transition fit with the dowel pin holes.

5. The screwing apparatus according to claim 4, wherein the first support member further includes a plurality of threaded holes corresponding one-to-one to the plurality of dowel holes, one end of each of the threaded holes being perpendicular to and communicating with the corresponding dowel hole, the other end of the threaded hole being located on the outer surface of the first support member, and the top support structure further includes a plurality of tightening pins threadedly coupled one-to-one to the plurality of threaded holes so that one end of the tightening pin can tighten against the dowel.

6. The screwing device according to claim 2 or 3, wherein the connecting rod comprises a threaded section for threaded connection with the first support.

7. The screwing apparatus of claim 2 or 3, wherein the top support structure further comprises a plurality of pulling assemblies respectively attached to different portions of the upper surface of the first support member.

8. Screwing device according to one of claims 1 to 3, wherein the transmission means comprise torque amplification means which provide the torque output interface and torque transmission means which provide the inner circumferential surface and the first connection, the torque transmission means being in driving connection with the torque amplification means.

9. The screw device of claim 8, wherein the stator member includes a housing, the torque amplification device includes a through bore extending through the housing, the through bore including a first bore and a second bore that are coaxial, the torque output port is disposed on an inner side of the second bore, and a cross-sectional dimension of the first bore is greater than a cross-sectional dimension of the second bore.

10. The screwing apparatus of claim 8, wherein the torque transmission means comprises a hollow shaft and a second connecting portion for driving connection with the torque output port, the first and second connecting portions being located on respective axial sides of the hollow shaft, the inner bore of the hollow shaft providing the inner circumferential surface.

11. The screwing device according to claim 10, wherein a side wall of the hollow shaft is provided with an opening which extends through the side wall.

12. The screwing apparatus of claim 9, wherein the torque amplification device is a torque multiplier.

13. The screwing device according to any one of claims 1 to 3, wherein the connecting structure comprises clamping grooves which are uniformly distributed in the circumferential direction, the first connecting part comprises clamping teeth which are uniformly distributed in the circumferential direction around the axis of the inner circular surface, and the clamping teeth correspond to the clamping grooves in a one-to-one mode and are used for being inserted into the clamping grooves.

14. The screw driving device according to claim 13, wherein a protrusion is formed between adjacent locking grooves of the connecting structure, an end of the protrusion provides a first end surface, a plurality of the first end surfaces are coplanar and perpendicular to the axis of the nut, a groove is formed between adjacent locking teeth of the first connecting portion, a bottom of the groove provides a second end surface, and a plurality of the second end surfaces are coplanar and perpendicular to the axis of the inner circular surface.

15. The screwing device according to one of claims 1 to 3, characterized in that said shaft element comprises a first cylindrical surface, the axis of which is collinear with the axis of said shaft element, and in that said bottom end of said centering support shaft comprises a second cylindrical surface, the axis of which is collinear with the axis of said centering support shaft, said second cylindrical surface being intended to be in transitional engagement with said first cylindrical surface.

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