CN216398676U

CN216398676U - Fastening device for front cover assembly

Info

Publication number: CN216398676U
Application number: CN202122884883.5U
Authority: CN
Inventors: 周俊; 李坤; 翟志余
Original assignee: Sichuan Guoruan Technology Group Co Ltd
Current assignee: Sichuan Guoruan Technology Group Co Ltd
Priority date: 2021-11-19
Filing date: 2021-11-19
Publication date: 2022-04-29
Anticipated expiration: 2031-11-19

Abstract

The utility model relates to a fastening device for a front cover assembly, which comprises a support frame and at least three sets of pre-screwing assemblies for adapting bolts, wherein each pre-screwing assembly is rotatably arranged on the support frame respectively, the pre-screwing assemblies are uniformly arranged along the circumferential direction of the same circle respectively, and one end of each pre-screwing assembly is respectively provided with a torsion part for adapting the head part of the bolt; the electric motor is respectively used for driving a torsion part in the pre-screwing assembly to rotate; this fastener, compact structure, reasonable in design through all disposing solitary motor for every subassembly of screwing in advance to utilize each motor to drive each portion of twisting respectively and rotate, both can the torque of each portion of twisting output of independent control, can adjust the pretightning force according to the fastening needs of reality again, and can screw up each bolt in the front shroud subassembly in step, can show the fastening efficiency that improves the bolt, be particularly useful for fastening each bolt in the front shroud subassembly.

Description

Fastening device for front cover assembly

Technical Field

The utility model relates to the technical field of automatic assembly of bolts in a front cover assembly, in particular to a fastening device for the front cover assembly.

Background

In the technical field of rail transit equipment, a wheel pair is an important part which is in contact with a steel rail on a locomotive, a front cover assembly is usually required to be installed at the shaft end of a wheel shaft in the wheel pair, and the front cover assembly usually comprises a front cover (or called an end cover and a pressing plate), a nameplate, a stop plate and a plurality of bolts, wherein through holes are respectively arranged at corresponding positions on the front cover, the nameplate and the stop plate, and the bolts are respectively sleeved in the through holes, as shown in fig. 1; the axle end of the wheel axle is correspondingly provided with threaded holes (the number is usually three or more, and each threaded hole is uniformly distributed along the circumferential direction), the bolts are respectively sleeved in the through holes and are used for connecting the threaded holes at the axle end of the wheel axle, namely, each through hole or each bolt in the front cover assembly is distributed on the same base circle, and each through hole and each bolt are uniformly distributed along the circumferential direction, as shown in fig. 1;

in the assembly process of the front cover assembly, the conventional process usually adopts manual operation to correspondingly screw bolts in the front cover assembly into threaded holes of the shaft ends, so as to realize the assembly of the front cover assembly and the wheel shaft; the pre-screwing device disclosed in the chinese patent CN 111890278A is constructed with at least three rotating shafts, and each rotating shaft is uniformly distributed along the circumferential direction so as to be adapted to each bolt in the front cover assembly, and each rotating shaft is in transmission connection with the driving motor, so that the purpose of synchronously pre-screwing each bolt in the front cover assembly can be achieved, and thus, the automatic pre-screwing and assembling of the front cover assembly can be realized; because there is the model difference in the wheel pair, lead to the corresponding front shroud subassembly to have the model difference, the most direct embodiment is: in the front cover assemblies of different models, the distances between the bolts and the central axis of the front cover assembly are different, namely the diameters of base circles where the bolts are located are different, so that the front cover assemblies are adapted to two models, in the pre-screwing device disclosed in chinese patent CN 111890278A, an adjusting part is further added for synchronously adjusting the positions of the rotating shafts in the radial direction so as to be adapted to the front cover assemblies of different sizes, specifically, the adjusting part is configured with at least two groups of clamping parts, each group of clamping parts respectively comprises at least three limiting grooves which are uniformly distributed in the circumferential direction and used for restricting the rotating shafts, the distance between the limiting grooves in the clamping parts and the rotation center is the same as the radius of the base circles, and the distances between the limiting grooves in different clamping parts and the rotation center are different, so that when the rotating shafts in the pre-screwing device are clamped in different limiting grooves, the distances between the rotating shafts and the rotation center can be changed, to accommodate bolts in different models of front cover assemblies.

In the operation specification of the bolt, the bolt needs to be pre-screwed and fastened (i.e. the pretightening force of the bolt reaches the pretightening force required by the design) in two stages, however, the pre-screwing device disclosed in the chinese patent CN 111890278A is only suitable for the pre-screwing operation of the bolt, is not suitable for fastening the bolt in the front cover assembly, and needs to be solved urgently.

Disclosure of Invention

The utility model aims to solve the problems that the existing pre-screwing device is only suitable for pre-screwing of bolts and is not suitable for fastening the bolts in a front cover assembly, and provides fastening equipment which can fasten the bolts in the front cover assembly, wherein the main concept is as follows:

a fastening device for a front cover assembly comprises a support frame and at least three sets of pre-screwing assemblies used for adapting bolts, wherein each pre-screwing assembly is rotatably arranged on the support frame respectively and is uniformly arranged along the circumferential direction of the same circle, one end of each pre-screwing assembly is provided with a torsion part adapted to the head of the bolt respectively,

the electric motor is respectively used for driving the twisting part in the pre-twisting assembly to rotate. In the scheme, each pre-screwing assembly is provided with an independent motor so as to respectively drive each twisting part to rotate by using each motor, the torque output by each twisting part can be independently controlled, the pre-tightening force can be adjusted according to actual fastening requirements, each bolt in the front cover assembly can be synchronously screwed, the fastening efficiency of the bolt can be obviously improved, and the pre-screwing assembly is particularly suitable for fastening each bolt in the front cover assembly.

In order to solve the problem of accurately controlling and setting the tightening force, the motor is further a servo tightening machine. The servo tightening machine is provided with a torque sensor so as to monitor the torque in the tightening process, thereby achieving the purposes of accurately controlling, monitoring and setting the tightening force.

In order to control the fastening process, the fastening device further comprises a controller, and each motor is electrically connected with the controller. The controller is used for controlling each motor, so that not only can the fastening process be accurately controlled, but also the remote adjustment and automatic control can be realized; in addition, through the cooperation of controller and servo tightening machine, can accomplish the screw-up work of different model bolts better, more efficient.

Preferably, the controller is a single chip microcomputer, a PC (personal computer) or a PLC (programmable logic controller) and the like.

In order to facilitate assembly, the electric vehicle further comprises a plurality of mounting frames, the pre-screwing assemblies are respectively mounted on the mounting frames, and the motors are respectively mounted on the mounting frames. That is, in this scheme, install one on each mounting bracket respectively and twist subassembly and motor in advance, and the motor with twist the subassembly transmission in advance and be connected, the transmission of not only being convenient for makes the motor moreover with what correspond twist the subassembly in advance and can connect as an organic wholely through the mounting bracket to make each functional unit modularization, subsequent integral erection, regulation and dismantlement of being convenient for.

In order to solve the problem of adapting to the front cover assemblies with different models, the front cover assembly further comprises an adjusting part,

the position of each pre-screwing assembly can be adjusted along the radial direction of the circle,

the adjusting part is rotatably arranged on the supporting frame and is positioned on the inner side of each pre-screwing component, the adjusting part is constructed with at least two groups of clamping parts, each group of clamping parts respectively comprises at least three limiting grooves which are uniformly distributed along the circumferential direction and used for restricting the pre-screwing components, in the same group of clamping parts, the distance between each limiting groove and the rotation center of the adjusting part is the same, and the distance between the limiting grooves in different clamping parts and the rotation center of the adjusting part is different. In the scheme, the adjusting part is arranged, at least two groups of clamping parts are constructed in the adjusting part, each group of clamping parts comprises at least three limiting grooves which are uniformly distributed along the circumferential direction and used for restraining the pre-screwing components, and the limiting grooves in the same group of clamping parts are in a common circle so as to be adapted to the front cover assembly with one type, so that the radius of a base circle where each bolt in the front cover assembly is located is equal to the radius of a circle where each pre-screwing component in the equipment is located, the radial position of each pre-screwing component is accurately positioned, and the purpose of adapting to the front cover assembly with the corresponding type is achieved; in this scheme, the spacing groove of different group's card portion of holding is not the same circle, and the radius that each spacing groove place circle in different group's card portion of holding is different promptly to fix a position each in advance to radial different positions department, thereby solve the purpose of the different model front shroud subassemblies of adaptation.

In order to solve the problem of utilizing the rotation smooth adjustment of adjusting part to twist the radial position of subassembly in advance, further, the spacing groove in two sets of adjacent card holders links to each other, just the spacing groove is the groove of arc structure. Through linking to each other two adjacent spacing grooves, be favorable to realizing in succession, steady regulation, and the groove of arc structure is more convenient for cooperate with the surface of twisting the subassembly in advance pivot or bearing frame, avoids taking place card pause, collision scheduling problem at the in-process of adjusting.

In order to solve the problem of automatically adjusting the radial position of each front cover component, the automatic adjusting device further comprises a telescopic device, one end of the telescopic device is hinged to the adjusting component, the other end of the telescopic device is hinged to the supporting frame, the controller is electrically connected with the telescopic device, and the telescopic device drives the adjusting component to rotate relative to the supporting frame through stretching/shrinking. In the scheme, the telescopic device is arranged, and two ends of the telescopic device are respectively hinged with the adjusting part and the support frame, so that the adjusting part can be driven to rotate relative to the support frame through the telescopic/contracting action of the telescopic device, the radial positions of the pre-twisted assemblies can be synchronously adjusted in a manner of rotating the adjusting part, the purpose of high-efficiency adjustment is achieved, the telescopic/contracting line driving of the telescopic device is realized, manpower consumption is avoided, the labor cost can be effectively reduced, remote adjustment and automatic control can be realized through controlling the telescopic device, and the problems in the prior art are effectively solved; in addition, in this scheme, utilize the flexible device as drive adjustment part for support frame pivoted power, can install the flexible device in one side of support frame to can solve because structural space restriction leads to the installation motor of being inconvenient for, and then can not utilize motor drive adjustment part pivoted problem.

Preferably, the telescopic device adopts an air cylinder, a hydraulic cylinder or an electric push rod.

In order to facilitate installation, the telescopic device further comprises a support, the support is arranged on one side of the support frame and is fixedly connected to the support frame, the telescopic device is located on one side of the support frame, and two ends of the telescopic device are respectively hinged to the adjusting part and the support.

In order to solve the problem of rotatable installation of the adjusting component, further, at least one side of the adjusting component is configured with an outward convex installation shaft, the installation shaft is rotatably installed on the supporting frame,

the adjusting component is provided with a transmission arm, and one end of the telescopic device is hinged to the transmission arm. Not only is the rotatable installation of the adjusting part convenient, but also the transmission of the telescopic device and the adjusting part is convenient.

Preferably, the telescopic device comprises two adjusting parts which are parallel to each other, the transmission arms of the two adjusting parts are connected through a connecting piece, and one end of the telescopic device is hinged to the connecting piece.

Further, still include the connector, the one end fixed connection of flexible device in the connector, the connector is constructed with the hinge hole, the connecting piece is constructed with the adaptation the shaft part of hinge hole, the rotatable connection of connector in the shaft part. Thereby achieving the purpose of hinging.

In order to solve the problem that the position of the pre-screwing assembly can be adjusted along the radial direction, the pre-screwing assembly further comprises at least three sets of guide assemblies, each guide assembly comprises a sliding block and a guide structure matched with the sliding block, the guide structures are constructed on the supporting frame and are arranged along the radial direction of the circle, the sliding blocks are movably constrained on the guide structures and are used for moving along the guide structures,

the pre-screwing assembly is rotatably connected to the slider. The pre-screwing assemblies can not only rotate relative to the sliding block to achieve the purpose of screwing the bolt, but also can move along with the sliding block along the radial direction so as to adjust the radial position of each pre-screwing assembly and adapt to front cover assemblies of different models.

Preferably, the two sides of the sliding block are respectively provided with a restraining groove, the support frame is provided with a strip-shaped clamping groove which is distributed along the radial direction of the circle, the two sides of the strip-shaped clamping groove are respectively provided with a strip-shaped bulge which is matched with the restraining groove, the width of the sliding block is matched with the strip-shaped clamping groove, and the sliding block is movably restrained in the strip-shaped clamping groove. The problem of the direction and the restraint to the slider is solved.

In order to solve the problems of synchronous transmission and elastic constraint of each pre-screwing component, the device further comprises a belt transmission mechanism, wherein the belt transmission mechanism comprises a driving belt wheel rotatably arranged on the support frame, a driven belt wheel respectively arranged on each pre-screwing component, a transmission belt and a tensioning mechanism, the transmission belt respectively bypasses the driving belt wheel and each driven belt wheel, each driven belt wheel is respectively positioned on the inner side of the transmission belt, and the tensioning mechanism is used for tensioning the transmission belt. In the scheme, the transmission belt is wound on the outer side of each pre-screwing component, and then the tensioning mechanism is matched, so that the transmission belt can be used for providing pressure towards the rotation center of the adjusting part for each pre-screwing component, the adjusting part is arranged on the inner side of each pre-screwing component, and the limiting groove in the adjusting part can play a role in limiting the pre-screwing component, so that each pre-screwing component can keep balance under the double effects of the transmission belt and the limiting groove, and the problems of positioning and limiting the pre-screwing component are solved; and through constructing the tensioning mechanism, the transmission belt can be tensioned, and the purpose of elastically restricting each adjusting part is achieved, so that each adjusting part can rotate and each pre-screwing assembly can be driven to move along the radial direction.

Preferably, the subassembly of twisting in advance includes the pivot, driven pulleys install in the pivot, the portion of twisting constructs in the one end of pivot, just the pivot passes through the bearing and connects in the slider, the slider connect in the mounting bracket.

In order to facilitate the forming, the pre-screwing assembly further comprises a twisting head, the twisting head is mounted at one end of the rotating shaft, and the twisting part is configured on the twisting head. The processing and the molding of the torsion part are convenient.

In order to be convenient to be matched with the head of the bolt, the torsion part is preferably a hexagonal hole, a dodecagonal hole, a hexagonal prism, a dodecagonal prism, a linear bulge or a cross-shaped bulge matched with the head of the bolt. So that the bolt of adaptation different models, the commonality is better.

Compared with the prior art, the fastening device for the front cover assembly provided by the utility model has a compact structure and a reasonable design, and is particularly suitable for fastening bolts in the front cover assembly, and the fastening device is provided with a single motor for each pre-screwing assembly so as to drive each torsion part to rotate by using each motor respectively, so that the torque output by each torsion part can be controlled independently, the pretightening force can be adjusted according to the actual fastening requirement, and the bolts in the front cover assembly can be synchronously screwed.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural view of a conventional front cover assembly.

Fig. 2 is a schematic structural diagram of a fastening device for a front cover assembly according to an embodiment of the present invention, not showing a belt transmission mechanism.

Fig. 3 is a front view of fig. 2.

Fig. 4 is a schematic view illustrating an internal structure of a fastening device for a front cover assembly according to an embodiment of the present invention.

Fig. 5 is a schematic view of a pre-tightening assembly in driving connection with a servo tightening machine in a fastening device for a front cover assembly according to an embodiment of the present invention.

Fig. 6 is a partial structural view of an adjusting member of a fastening device for a front cover assembly according to an embodiment of the present invention.

Fig. 7 is a front view of an adjustment member in a fastening device for a front cover assembly according to an embodiment of the present invention.

Fig. 8 is a schematic view of a fastening device for a front cover assembly according to an embodiment of the present invention, in which an adjusting member restrains each of the pre-screw assemblies at one position, wherein a dotted line represents a circle on which each of the pre-screw assemblies is located.

Fig. 9 is a schematic view of the adjusting part restraining each pre-screwing assembly at another position in the fastening device for the front cover assembly according to the embodiment of the present invention, wherein the dotted line represents a circle where each pre-screwing assembly is located.

Fig. 10 is one of the partial cross-sectional views of fig. 2.

Fig. 11 is a partial structural view of a fastening device for a front cover assembly according to an embodiment of the present invention, not showing a telescopic device.

Fig. 12 is a second partial cross-sectional view of fig. 2.

Description of the drawings

Support 100, strip-shaped slot 101 and strip-shaped protrusion 102

Pre-screwing assembly 200, twisting head 201, twisting part 202, rotating shaft 203, bearing 204 and mounting rack 205

Slider 300

Adjusting part 400, clamping part 401, limiting groove 402, first limiting groove 403, second limiting groove 404, mounting shaft 405, telescopic device 406, bracket 407, transmission arm 408, connecting piece 409 and connecting head 410

Driving pulley 501, driven pulley 502, transmission belt 503, frame 504, tension member 505

Front cover 601, nameplate 602, stop piece 603 and bolt 604

An electric machine 700.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

Referring to fig. 2 to 12, in the present embodiment, a fastening device for a front cover assembly is provided, which includes a supporting frame 100 for supporting and at least three sets of pre-screwing assemblies 200 for adapting to bolts, as shown in fig. 2, each pre-screwing assembly 200 is rotatably mounted on the supporting frame 100, each pre-screwing assembly 200 is uniformly arranged along a circumferential direction of a same circle, that is, central axes of each pre-screwing assembly 200 are concentric, positions of each pre-screwing assembly 200 can be adjusted along a radial direction of the circle, and one end of each pre-screwing assembly 200 is configured with a torsion portion 202 for adapting to a bolt head, so as to drive the bolt to rotate; in specific implementation, the number of the pre-screwing assemblies 200 may be determined according to actual requirements, and is usually adapted to the number of the bolts in the front cover assembly, for example, in the embodiment, as shown in fig. 2 to 4, three sets of the pre-screwing assemblies 200 are installed on the supporting frame 100, and the three sets of the pre-screwing assemblies 200 are respectively and uniformly distributed along the circumferential direction so as to be adapted to the three bolts in the front cover assembly, so that each pre-screwing assembly 200 can correspond to each bolt one to one.

The fastening device provided by the embodiment further includes an adjusting component 400, wherein the adjusting component 400 is rotatably mounted on the supporting frame 100 and is located inside each of the pre-screwing components 200, and a rotation center of the adjusting component coincides with a center of the circle, as shown in fig. 8 and 9; each adjusting part 400 is respectively configured with at least two groups of clamping parts 401, each group of clamping parts 401 respectively comprises at least three limiting grooves 402 which are uniformly distributed along the circumferential direction and used for restricting the pre-screwing assembly 200, as shown in fig. 6-10, in the same clamping part 401, the number of the limiting grooves 402 is the same as that of the pre-screwing assembly 200 and the number of the bolts in the front cover assembly, for example, in the present embodiment, two clamping parts 401 are included, and the same clamping part 401 respectively comprises three limiting grooves 402, as shown in fig. 6-10, for the convenience of distinction, the limiting groove 402 of one clamping part 401 is referred to as a first limiting groove 403, and the limiting groove 402 of the other clamping part 401 is referred to as a second limiting groove 404, as shown in fig. 6-10; in the same group of clamping parts 401, the distance between each limiting groove 402 and the rotation center of the adjusting part 400 is the same, that is, the limiting grooves 402 in the same group of clamping parts 401 are in a common circle so as to be adapted to a front cover assembly of a certain model, so that the radius of a base circle where each bolt in the front cover assembly is located is equal to the radius of a circle where each pre-screwing assembly 200 in the fastening device is located, and the radial position of each pre-screwing assembly 200 (namely, the radial position taking the circle center of the circle where each pre-screwing assembly 200 is located as a reference, which is not described in detail later) is accurately positioned so as to adapt to the purpose of corresponding to the front cover assembly of the corresponding model; the spacing between the limiting grooves 402 in different clamping parts 401 and the rotation center of the adjusting part 400 is different, that is, the limiting grooves 402 in different groups of clamping parts 401 are not in a same circle, that is, the radius of the circle where each limiting groove 402 in different groups of clamping parts 401 is located is different, so that different clamping parts 401 can constrain each pre-screwing assembly 200 to different distances from the rotation center of the adjusting part 400, so as to adapt to front cover assemblies of different models.

To visualize manual adjustment, the adjustment member 400 may be configured with a handle to manually rotate the adjustment member 400; in order to realize automatic adjustment, in another scheme, the device further comprises a telescopic device 406, as shown in fig. 2 to 4, in this embodiment, one end of the telescopic device 406 is hinged to the adjusting part 400, and the other end of the telescopic device 406 is hinged to the support frame 100, so that the telescopic device 406 can drive the adjusting part 400 to rotate relative to the support frame 100 through extension/retraction, not only can the radial position of each pre-screwing assembly 200 be synchronously adjusted through rotating the adjusting part 400, and the purpose of efficient adjustment is achieved, but also can be driven through extension/retraction of the telescopic device 406, without manpower consumption, so that not only can the labor cost be effectively reduced, but also remote adjustment and automatic control can be realized by controlling the telescopic device 406, and thus the problems in the prior art are effectively solved; in addition, in this embodiment, the retractable device 406 is used as the power for driving the adjusting part 400 to rotate relative to the supporting frame 100, and the retractable device 406 can be installed on one side of the supporting frame 100, so that the problem that the motor cannot be installed conveniently due to structural space limitation, and the adjusting part 400 cannot be driven to rotate by the motor can be solved.

In this embodiment, the telescopic device 406 may preferably adopt an air cylinder, a hydraulic cylinder or an electric push rod, etc., and in a further scheme, the fastening device further comprises a bracket 407, the bracket 407 is disposed on one side of the supporting frame 100 and is fixedly connected to the supporting frame 100, as shown in fig. 2-4, accordingly, the telescopic device 406 is disposed on one side of the supporting frame 100, and two ends of the telescopic device 406 are respectively hinged to the adjusting component 400 and the bracket 407.

In a preferred embodiment, the limiting grooves 402 in two adjacent sets of clamping parts 401 may be connected to each other, which is beneficial for continuous and smooth adjustment, and in this embodiment, the limiting grooves 402 may preferably adopt grooves with an arc structure, as shown in fig. 2 to 12, which is more convenient for matching with the outer surface of the rotating shaft 203 or the bearing 204 seat in the pre-screwing assembly 200, so as to avoid the problems of jamming, collision and the like during adjustment, and thus, the radial position of each pre-screwing assembly 200 can be smoothly adjusted by using the rotation of the adjusting part 400.

For the sake of simplifying the structure, in this embodiment, the adjusting member 400 may be a plate-shaped structure, and the limiting grooves 402 are respectively configured at the outer contour of the adjusting member 400, as shown in fig. 2-10, and for the convenience of installing the adjusting member 400, in a further aspect, at least one side of the adjusting member 400 is configured with an installation shaft 405 protruding outwards, and the installation shaft 405 is rotatably installed on the supporting frame 100, for example, the installation shaft 405 may be connected to the supporting frame 100 through a bearing 204, and the adjusting member 400 is further configured with a transmission arm 408, as shown in fig. 6 and 7, one end of the telescopic device 406 is hinged to the transmission arm 408, so as to facilitate the transmission between the telescopic device 406 and the adjusting member 400.

The number of the adjusting components 400 may be one, two or more, for example, in a preferred implementation manner, as shown in fig. 2 to 6, the two adjusting components 400 are included, the two adjusting components 400 have a set distance therebetween, and the two adjusting components 400 are parallel to each other, and by arranging the two adjusting components 400, two constraints can be formed on the pre-screwing assembly 200, thereby facilitating more stable and firm constraint of the pre-screwing assembly 200; the transmission arms 408 of the two adjusting parts 400 are connected into a whole through a connecting part 409, so that the two adjusting parts 400 can synchronously act, and one end of the telescopic device 406 is hinged to the connecting part 409, as shown in fig. 6, in a more perfect scheme, the adjusting device further comprises a connector 410, as shown in fig. 6, one end of the telescopic device 406 is fixedly connected to the connector 410, the connector 410 is provided with a hinge hole, the connecting part 409 is provided with a shaft section matched with the hinge hole, and the connector 410 is rotatably connected to the shaft section, so that the purpose of hinging is achieved; for example, as shown, the connector 409 may take a cylindrical configuration to fit the hinge bore.

It will be appreciated that the other end of the telescopic member 406 may be hinged to the support 407 using a conventional hinge structure, as shown in fig. 2, which is not illustrated here.

As shown in fig. 2-3, in the present embodiment, the telescopic device 406 can drive the adjusting component 400 to rotate, so that each pre-screwing assembly 200 can be synchronously disengaged from the limiting groove 402 in the current clamping part 401 and smoothly clamped into the limiting groove 402 in another clamping part 401, thereby achieving the purpose of automatically and synchronously adjusting the radial position of each pre-screwing assembly 200, and thus being adapted to front cover assemblies of different models; in order to realize remote adjustment and control, the fastening device further comprises a controller, wherein the controller is electrically connected with the telescopic device 406 so as to control the telescopic device 406 by using the controller, such as controlling the starting/stopping, extending/contracting amount and the like of the telescopic device 406, thereby being beneficial to realizing remote adjustment and automatic control; in specific implementation, the controller may preferably adopt a single chip microcomputer, a PC or a PLC.

Since each pre-screwing assembly 200 can move along the radial direction in the process of adjusting the radial position of each pre-screwing assembly 200, in a further scheme, the fastening device for the front cover assembly further comprises at least three sets of guide assemblies, wherein each guide assembly comprises a sliding block 300 and a guide structure matched with the sliding block 300, the guide structures are mounted or directly constructed on the support frame 100 and are arranged along the radial direction of the circle (namely the circle where each pre-screwing assembly 200 is located), and the sliding block 300 is movably constrained to the guide structures, so that the sliding block 300 can move along the guide structures, and the purpose of moving along the radial direction of the circle is achieved;

accordingly, in the present embodiment, each of the pre-screwing assemblies 200 is rotatably connected to the corresponding sliding block 300, that is, the number of the guiding assemblies is equal to the number of the pre-screwing assemblies 200, and in the present embodiment, three guiding assemblies are included, as shown in fig. 2, 3, 10 and 12, so that the pre-screwing assemblies 200 can not only rotate relative to the sliding block 300 for the purpose of screwing the bolts, but also move along with the sliding block 300 in the radial direction, so as to adjust the radial position of each of the pre-screwing assemblies 200, so as to adapt to different models of front cover assemblies.

Since the guide assembly functions as a guide, there are various embodiments, for example, the guide structure may be a rail to which the slider 300 is movably constrained; the guide structure may be a guide groove, at this time, the slider 300 may be movably constrained in the guide groove, the guide structure may be a guide rod, at this time, the slider 300 may be movably sleeved on the guide rod, and both the guide structure and the guide rod can play a role in guiding; in the preferred embodiment provided by this embodiment, the two sides of the slider 300 are respectively configured with a constraining groove, as shown in fig. 10-12, the supporting frame 100 is configured with a strip-shaped slot 101 distributed along the radial direction of the circle, the two sides of the strip-shaped slot 101 are respectively configured with a strip-shaped protrusion 102 adapted to the constraining groove, as shown in fig. 10-12, and the width of the slider 300 is adapted to the strip-shaped slot 101, so that the slider 300 can be movably constrained in the strip-shaped slot 101, at this time, the slider 300 can be configured with a bearing 204 hole to mount the bearing 405, and the pre-screwing assembly 200 can be connected to the bearing 204.

In order to solve the problem of elastic constraint of each pre-screwing assembly 200, in a more sophisticated scheme, as shown in fig. 10-12, the fastening device further comprises a belt transmission mechanism, wherein the belt transmission mechanism comprises a driving pulley 501 rotatably mounted on the support frame 100, a driven pulley 502 respectively mounted on each pre-screwing assembly 200, a transmission belt 503, and a tensioning mechanism, wherein the transmission belt 503 is wound around the driving pulley 501 and the driven pulleys 502 respectively, as shown in fig. 11 and 12, each driven pulley 502 can be mounted between two adjusting members 400 respectively, each driven pulley 502 is located on the inner side of the transmission belt 503, and the tensioning mechanism is used for tensioning the transmission belt 503, specifically, in this embodiment, by winding the transmission belt 503 on the outer side of each pre-screwing assembly 200, and cooperating with the tensioning mechanism, the transmission belt 503 can be used for providing pressure towards the rotation center of the adjusting members 400, the adjusting part 400 is arranged on the inner side of each pre-screwing assembly 200, and the limiting groove 402 in the adjusting part 400 can play a role in limiting the pre-screwing assemblies 200, so that each pre-screwing assembly 200 can keep balance under the double actions of the driving belt 503 and the limiting groove 402, and the problems of positioning and limiting the pre-screwing assemblies 200 are solved; by constructing the tensioning mechanism, the driving belt 503 can be tensioned to achieve the purpose of elastically constraining each adjusting member 400, so that each pre-screwing assembly 200 can synchronously move in the radial direction under the action of the adjusting member 400 when the adjusting member 400 rotates, thereby achieving the purpose of adjusting the radial position.

The tensioning mechanism has various installation manners, for example, the tensioning mechanism may include a tensioning wheel to tension the transmission belt 503 by using the tensioning wheel, but in a preferred embodiment, as shown in fig. 11 and 12, the tensioning mechanism includes a frame 504 and a tensioning member 505, the frame 504 is movably (rotatably) connected to the support frame 100, one end of the frame 504 is sleeved with a torsion spring, one end of the torsion spring is fixed to the support frame 100, the other end of the torsion spring is fixed to the frame 504, the tensioning member 505 is arranged at the other end of the frame 504, the torsion spring drives the tensioning member 505 to press the transmission belt 503 by an elastic force, so as to achieve the purpose of tensioning the transmission belt 503, the tensioning member 505 may be a rod-shaped structure, or the tensioning member 505 is sleeved with a roller or a bearing 204 or the like for contacting the transmission belt 503 so as to reduce friction, as shown in fig. 11 and 12, this embodiment employs two tensioning mechanisms, the two tensioning mechanisms are symmetrically arranged on two sides of the transmission belt 503, and respectively press the transmission belt 503 towards the inner side of the transmission belt 503 through the tensioning members 505, so as to achieve the purpose of tensioning.

The pre-screwing assembly 200 has various embodiments, for example, as shown in fig. 2 to 5, the pre-screwing assembly 200 includes a rotating shaft 203, the driven pulley 502 may be mounted on the rotating shaft 203, the torsion portion 202 may be configured at one end of the rotating shaft 203, and the rotating shaft 203 may be connected to the slider 300 through a bearing 204, and the slider 300 may be connected to the mounting bracket 205, that is, each pre-screwing assembly 200 may be mounted on one mounting bracket 205, respectively, as shown in fig. 2, 4 and 5, the adjusting member 400 is used for supporting the rotating shaft 203, and the limiting groove 402 in the adjusting member 400 may directly contact and abut against the rotating shaft 203 or may contact and abut against the bearing 204 mounted on the rotating shaft 203, as shown in fig. 2 to 12, so as to reduce the friction between the limiting groove 402 and the rotating shaft 203 using the bearing 204.

In this embodiment, the torsion portion 202 may be a hexagonal hole, a dodecagonal hole, a hexagonal prism, a dodecagonal prism, a linear protrusion, or a cross protrusion, etc. adapted to the head of the bolt, so as to adapt to bolts of different types, and the universality is better; for example, in the present embodiment, the torsion portion 202 is a hexagonal hole adapted to the head of the bolt so as to be adapted to a hexagonal bolt, and the torsion portion 202 may be directly configured on the rotating shaft 203 or configured on a torsion head 201, and the torsion head 201 is mounted on one end of the rotating shaft 203, as shown in fig. 2 and 3, so as to facilitate the processing and forming of the torsion portion 202.

In a more complete scheme, the fastening device further comprises at least three motors 700, as shown in fig. 2, 4 and 5, each motor 700 is respectively in transmission connection with each pre-screwing assembly 200, and the motors 700 are respectively used for driving the torsion portions 202 in the pre-screwing assemblies 200 to rotate; each pre-screwing assembly 200 is provided with a single motor 700, so that each motor 700 is utilized to drive each twisting part 202 to rotate, the torque output by each twisting part 202 can be controlled independently, the pre-tightening force can be adjusted according to the actual fastening requirement, each bolt in the front cover assembly can be synchronously screwed, the fastening efficiency of the bolt can be obviously improved, and the pre-screwing assembly is particularly suitable for fastening each bolt in the front cover assembly.

In specific implementation, the motor 700 may preferably adopt a servo tightening machine with a torque sensor, so as to monitor the torque during the tightening process, thereby achieving the purpose of accurately controlling, monitoring and setting the tightening force; as an example, the servo tightening machine may preferably employ a fully automatic servo tightening machine of the ESTIC asteke in order to achieve precise control of the bolt tightening force.

In the present embodiment, the motors 700 are electrically connected to the controller, respectively. The motors 700 are controlled by the controller, so that not only can the fastening process be accurately controlled, but also the remote adjustment and automatic control can be realized; in addition, through the cooperation of controller and servo tightening machine, can accomplish the screw-up work of different model bolts better, more efficient.

In order to facilitate assembly, in a further scheme, as shown in fig. 5, each motor 700 may be respectively mounted on the mounting frame 205, that is, one pre-screwing assembly 200 and one motor 700 are respectively mounted on each mounting frame 205, and the motor 700 is in transmission connection with the pre-screwing assembly 200, which not only facilitates transmission, but also enables the motor 700 and the corresponding pre-screwing assembly 200 to be connected into a whole through the mounting frame 205, so as to modularize each functional unit and facilitate subsequent overall installation, adjustment and disassembly.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.

Claims

1. The utility model provides a fastener for front shroud subassembly, includes the support frame and at least three sets of subassembly of twisting in advance that are used for the adaptation bolt, each is twisted the subassembly in advance and is rotatably installed in the support frame respectively, and each is twisted the subassembly in advance and evenly arranges along the circumferencial direction of same circle respectively, and each one end of twisting the subassembly in advance is constructed the torsion portion that has adaptation bolt head respectively, its characterized in that still includes at least three motor, each the motor is respectively transmission connection each is twisted the subassembly in advance, and the motor is arranged in the drive to twist the torsion portion rotation in the subassembly in advance respectively.

2. The fastening device for a front cover assembly according to claim 1, wherein the motor employs a servo tightening machine;

and/or the motor controller also comprises a controller, and each motor is electrically connected with the controller;

and/or the electric vehicle also comprises a plurality of mounting frames, the pre-screwing assemblies are respectively mounted on the mounting frames, and the motors are respectively mounted on the mounting frames.

3. The fastening device for a front cover assembly according to claim 2, further comprising an adjustment member,

the adjusting part is rotatably arranged on the supporting frame and is positioned on the inner side of each pre-screwing component, the adjusting part is constructed with at least two groups of clamping parts, each group of clamping parts respectively comprises at least three limiting grooves which are uniformly distributed along the circumferential direction and used for restricting the pre-screwing components, in the same group of clamping parts, the distance between each limiting groove and the rotation center of the adjusting part is the same, and the distance between the limiting grooves in different clamping parts and the rotation center of the adjusting part is different.

4. The fastening device for a front cover assembly according to claim 3, further comprising at least three sets of guide assemblies, wherein the guide assemblies comprise a slider and a guide structure adapted to the slider, the guide structure is configured on the supporting frame and arranged along the radial direction of the circle, the slider is movably constrained to the guide structure for moving along the guide structure,

the pre-screwing assembly is rotatably connected to the slider.

5. The fastening device for a front cover assembly according to claim 4, wherein the slider is configured with a constraining groove on each side, the supporting frame is configured with a strip-shaped clamping groove distributed along the radial direction of the circle, the strip-shaped clamping groove is configured with a strip-shaped protrusion matched with the constraining groove on each side, the width of the slider is matched with the strip-shaped clamping groove, and the slider is movably constrained in the strip-shaped clamping groove.

6. The fastening device for a front cover assembly according to claim 4, further comprising a belt transmission mechanism including a driving pulley rotatably mounted to the support frame, driven pulleys mounted to the respective pre-screwing assemblies, respectively, wherein the driving belt is wound around the driving pulley and the respective driven pulleys, and the respective driven pulleys are located inside the driving belt, and a tensioning mechanism for tensioning the driving belt.

7. The fastening device for a front cover assembly according to claim 6, wherein the pre-screwing assembly comprises a rotating shaft, the driven pulley is mounted on the rotating shaft, the torsion portion is configured at one end of the rotating shaft, and the rotating shaft is connected to a slider through a bearing, the slider being connected to the mounting bracket.

8. The fastening device for a front cover assembly according to claim 7, wherein the pre-screwing assembly further comprises a twisting head mounted at one end of the rotating shaft, the twisting part being configured at the twisting head;

and/or the torsion part is a hexagonal hole, a dodecagonal hole, a hexagonal prism, a dodecagonal prism, a linear protrusion or a cross protrusion matched with the head of the bolt;

and/or the controller adopts a singlechip, a PC (personal computer) or a PLC (programmable logic controller).

9. The fastening device for a front cover assembly according to any one of claims 3 to 8, further comprising a telescopic device, wherein one end of the telescopic device is hinged to the adjusting member, the other end of the telescopic device is hinged to the support frame, the controller is electrically connected with the telescopic device, and the telescopic device drives the adjusting member to rotate relative to the support frame through extension/contraction.

10. The fastening device for a front cover assembly according to claim 9, wherein the telescopic means is a cylinder, a hydraulic cylinder or an electric push rod;

and/or at least one side of the adjusting component is provided with an outwards convex installation shaft which is rotatably installed on the supporting frame, the adjusting component is provided with a transmission arm, and one end of the telescopic device is hinged to the transmission arm;

and/or the telescopic device comprises two adjusting parts which are parallel to each other, the transmission arms of the two adjusting parts are connected through a connecting piece, and one end of the telescopic device is hinged to the connecting piece.