CN205021077U

CN205021077U - Camber beam car is frame welding jig for sample

Info

Publication number: CN205021077U
Application number: CN201520756220.7U
Authority: CN
Inventors: 王亚军; 彭天一
Original assignee: Lifan Industry Group Co Ltd
Current assignee: Lifan Technology Group Co Ltd
Priority date: 2015-09-28
Filing date: 2015-09-28
Publication date: 2016-02-10
Anticipated expiration: 2025-09-28

Abstract

The utility model discloses a camber beam car is frame welding jig for sample, a serial communication port, welding jig includes that upper surface and all side surfaces all arrange the three -dimensional mounting platform of a plurality of mounting holes according to the constant spacing array to and the frame proterosoma positioning fixture structure, the anterior fixed -position welding anchor clamps structure of back beam pipe, the back beam that set up on three -dimensional mounting platform manage rear portion fixed -position welding anchor clamps structure and the back beam rectal cauda fixed -position welding of portion anchor clamps structure. The utility model discloses can simplify the solder mount process, have easy operation, low cost to can make things convenient for the advantages such as trial -production adjustment of camber beam car sample.

Description

A kind of beam bending bicycle sample welding clamp of vehicle frame

Technical field

The utility model relates to frame of motorcycle manufacture field, relates to a kind of beam bending bicycle sample welding clamp of vehicle frame especially.

Background technology

Bent-beam motorcycle refers to that at the motorcycle girder in seat cushion front be the right front motor cycle type be bent downwardly backward to form a downward space in seat cushion front.Bent-beam motorcycle is present modal motorcycle, and in motorcycle family, its persistence and the feature such as simple to operation firmly get liking of consumer.Bent-beam motorcycle, as a economical and practical vehicle, becomes the popular car that various consumption strata is all suitable for.Motorcycle is in R&D process simultaneously, often needs first R & D design to go out sample product, carries out testing inspection, to ensure the dependable with function of final finished.

Be in the trendy bent-beam motorcycle of LF110 in a model, its body frame structure for automotive comprises the back rest tubular construction being positioned at anterior vehicle frame proterosoma structure and being positioned at rear portion, described vehicle frame proterosoma structure mainly comprises the standpipe being positioned at front end, the main-beam pipe that on rear side of standpipe, connecting overall is bending to the back lower place backward, main-beam pipe rear end is also fixedly welded with an engine suspension installing plate, the cover type structure that engine suspension installing plate is symmetrical and upper end cover and are overlapped on main-beam pipe rear end and are welded and fixed, in the middle part of engine suspension installing plate, left and right horizontal running through is fixedly installed a bottom fork axis, back rest tubular construction mainly comprises about the two rear upper beam pipes be set up in parallel and two rear lower beam pipes be set up in parallel, rear upper beam pipe front end overlap joint is weldingly fixed on main-beam pipe postmedian, oblique back upper place, rear end is obliquely installed, rear lower beam pipe front end overlap joint is weldingly fixed on engine suspension installing plate, and rear end extends rear laminating obliquely and is weldingly fixed on lower surface after rear upper beam pipe, add man-hour, also need consider after two between upper beam pipe forward position be welded and fixed an inverted U-shaped fuel tank fore-stock and a cushion rack from front to back successively, after two, upper beam pipe rear positions also needs to install rear elastic axis, rear elastic axis laterally to run through that being fixed on raises up and is connected to after two of upper beam pipe rear upper surface after two on elastic axis journal stirrup, after two elastic axis journal stirrup upper end also laterally run through be fixed with one after elastic axis journal stirrup web beam, rear elastic axis journal stirrup is exposed and respectively towards being front welded with a fuel tank after-poppet in rear elastic axis journal stirrup web beam two ends, and is successively welded with a car body covering journal stirrup, after two, upper beam pipe tail end is also upwards welded with the cushion lock support that an entirety is inverted U-shaped frame structure, and cushion lock support is each side welded and fixed a hood journal stirrup.

The frame of curved beam motorcycle of said structure, when motorcycle research and development sample is produced, after normally completing the processing of vehicle frame proterosoma structure, first complete back rest tubular construction being welded and fixed separately of each annex on it one by one, finally integral solder is formed as one vehicle frame again.Like this, there is operation various, complicated operation, the defect of high cost.Particularly producing due to sample usually needs the minor structure such as Accessory Members to some local to adjust, and like this, each adjustment all adopts the weld jig of fixed structure to realize welding, greatly increases cost, constrains the expansion of sample research and development.

Utility model content

For above-mentioned the deficiencies in the prior art, technical problem to be solved in the utility model is: how to provide one to simplify operation, make it simple to operate, with low cost, and conveniently can manufacture experimently the beam bending bicycle sample welding clamp of vehicle frame of adjustment further.

In order to solve the problems of the technologies described above, the utility model have employed following technical scheme: when describing in scheme, is arranged on the state after on vehicle frame for orientation describes benchmark with it.

A kind of beam bending bicycle sample welding clamp of vehicle frame, it is characterized in that, described weld jig comprises upper surface and all side surfaces all have some installing holes three-dimensional mounting platform according to constant spacing arranged in arrays, and is arranged on vehicle frame proterosoma positioning fixture structure, the anterior positioning welding clamp structure of back rest pipe, back rest pipe rear portion positioning welding clamp structure and the back rest pipe afterbody positioning welding clamp structure on three-dimensional mounting platform; Described vehicle frame proterosoma positioning fixture structure is for realizing the location to vehicle frame proterosoma; The anterior positioning welding clamp structure of described back rest pipe is for realizing the location of, fuel tank fore-stock anterior to anterior, the rear upper beam pipe of rear lower beam pipe and cushion rack; Described back rest pipe rear portion positioning welding clamp structure is for realizing the location to rear lower beam pipe rear portion, rear elastic axis journal stirrup, rear elastic axis, fuel tank after-poppet and car body covering journal stirrup; Described back rest pipe afterbody positioning welding clamp structure is for realizing the location to rear upper beam pipe rear portion, cushion lock support and hood journal stirrup.

Like this, the weld jig of such scheme, can realize the Set and Positioning on vehicle frame proterosoma, back rest tubular construction and back rest tubular construction between each Accessory Members simultaneously, after making it locate, can directly adopt the disposable realization of welding gun to being welded and fixed between each component.Make each component relative-position error reliable and welding operation is convenient and swift, provide cost savings.

As optimization, described vehicle frame proterosoma positioning fixture structure comprises standpipe positioning component and bottom fork axis positioning component;

Described standpipe positioning component comprises the standpipe location standard square chest of a rectangular body structure of entirety, the each side of standard square chest is all furnished with some installing holes according to the spacing consistent with the installing hole on three-dimensional mounting platform and array of apertures in described standpipe location, standpipe location standard square chest is also upwards extended by being bolted to three-dimensional mounting platform front Middle face, described standpipe positioning component also comprises the standpipe location standard angle device that is fixed on standpipe location standard square chest upper surface, described standpipe location standard angle device comprises the fixed block and moving block separately with a hinged end and a folding end, the hinged end of fixed block and moving block rotatably hinged and be provided with in hinged place for realize rotational angle location rotational angle alignment pin, described fixed block is all furnished with some installing holes according to the spacing consistent with the installing hole on three-dimensional mounting platform and array of apertures with on moving block, the fixed block folding end of described standpipe location standard angle device is arranged forward and is horizontally fixed on standpipe location standard square chest upper surface by bolt, the moving block upper surface middle part of described standpipe location standard angle device is upwards fixedly installed standpipe positioning round table, described standpipe positioning round table diameter and lower riser end external diameter coupling and standpipe positioning round table axle center place coaxial on be provided with standpipe internal diameter coupling standpipe locating dowel, standpipe locating dowel movable upper end is combined with the discoidal standpipe for compressing location rear profile tube and is fixed block,

Described bottom fork axis positioning component comprises the bottom fork axis positioning support angle bar of two rectangular ladder-shaped frame structures of entirety, each side is all furnished with some installing holes according to the spacing consistent with the installing hole on three-dimensional mounting platform and array of apertures with described bottom fork axis positioning support angle bar, and bottom fork axis positioning support angle bar lower end is oppositely arranged by being bolted in the middle part of three-dimensional mounting platform and left and right; Bottom fork axis positioning support angle bar hypotenuse arranges backward and medial surface is fixedly installed the bottom fork axis locating piece extended forward, width coupling in the Distance geometry engine suspension installing plate left and right sides between two bottom fork axis locating pieces, two front upper ends of bottom fork axis locating piece are provided with bottom fork axis locating slot and for realizing the location to bottom fork axis two ends.

Like this, during use, the angle first adjusting standpipe location standard angle device opens up into required angle, and then standpipe is inserted into standpipe locating dowel and its lower end and standpipe positioning round table abutted support and the location realizing standpipe, be then fixed block compression standpipe upper end realization being completely fixed standpipe by standpipe; Then the engine suspension installing plate at vehicle frame proterosoma rear portion is dropped between two bottom fork axis positioning support angle bar, and the bottom fork axis end that the engine suspension installing plate left and right sides is exposed drops into the interior location realized bottom fork axis two ends of bottom fork axis locating slot on bottom fork axis locating piece.Like this, to achieve with simple structure by the mode of three-point fix the location of vehicle frame proterosoma is clamped.Ensure that the reliable of follow-up welding, make each component relative-position error reliable and welding operation is convenient and swift, provide cost savings.Simultaneously, realize being connected and coordinating owing to have employed between standard square chest, support angle, standard angle device and three-dimensional mounting platform and other non-standard align members, make each location structure can carry out adjustment flexibly and easily as required to install, make it be suitable for very much sample trial-production to need to use when adjusting each component partial member position, dramatically saves on R&D costs.Meanwhile, the bottom fork axis positioning support angle bar of setting conveniently can also install follow-up realization to back rest pipe and the installation of the assembly of annex location on it, is beneficial to and saves space and simplify cost.

As optimization, the anterior positioning welding clamp structure of described back rest pipe comprises the anterior positioning component of rear upper beam pipe anterior positioning component, fuel tank fore-stock positioning component, cushion rack positioning component and rear lower beam pipe;

The anterior positioning component of described rear upper beam pipe comprises the anterior positioning support angle bar of rear upper beam pipe of two entirety rectangular ladder-shaped frame structures, the anterior each side of positioning support angle bar is all furnished with some installing holes according to the spacing consistent with the installing hole on three-dimensional mounting platform and array of apertures to described rear upper beam pipe, and the anterior positioning support angle bar lower end of rear upper beam pipe is oppositely arranged by being bolted in the middle part of three-dimensional mounting platform and left and right, rear upper beam pipe anterior positioning support angle bar hypotenuse arrange backward and leading flank be fixedly connected with one after the anterior localization criteria protractor of upper beam pipe, the anterior localization criteria protractor of described rear upper beam pipe comprises the fixed block and moving block separately with a hinged end and a folding end, the hinged end of fixed block and moving block rotatably hinged and be provided with in hinged place for realize rotational angle location rotational angle alignment pin, described fixed block is all furnished with some installing holes according to the spacing consistent with the installing hole on three-dimensional mounting platform and array of apertures with on moving block, the fixed block of described rear upper beam pipe anterior location standard angle device vertically arrange and folding end downwards and by being horizontally fixed on rear upper beam pipe front portion positioning support angle bar leading flank by bolt, after two upper beam pipe anterior location standard angle device moving block between be laterally fixedly connected with a lateral connection block, upper beam pipe anterior location boss after upper beam pipe forward position is provided with two after corresponding two of lateral connection block upper surface, rear upper beam pipe anterior location boss medial surface is provided with for the anterior positioning step of rear upper beam pipe with laminating realization location, downside outside rear upper beam pipe front portion,

Described fuel tank fore-stock positioning component is included in described lateral connection block upper surface between the boss of upper beam pipe anterior location and fuel tank fore-stock location division extended to form forward after two, described fuel tank fore-stock location division upper surface is provided with a fuel tank fore-stock positioning boss, fuel tank fore-stock positioning boss upper surface is used for and the laminating of fuel tank fore-stock middle lower surface realizes location, on described fuel tank fore-stock positioning boss, the installing hole of corresponding fuel tank fore-stock is provided with fuel tank fore-stock locating hole and fuel tank fore-stock fastening screw and fixing for what realize after to fuel tank fore-stock location,

Described cushion rack positioning component is included in described lateral connection block upper surface between the boss of upper beam pipe anterior location and cushion rack location division formed that extends back after two, cushion rack location division upper surface is provided with two cushion rack locating dowels upwards, and two cushion rack locating dowel upper ends are provided with for inserting cushion rack positioning round table cushion rack realizing in two installing holes locate;

The anterior positioning component of described rear lower beam pipe comprises the anterior positioning support angle bar of rear lower beam pipe of two entirety rectangular ladder-shaped frame structures, the anterior each side of positioning support angle bar is all furnished with some installing holes according to the spacing consistent with the installing hole on three-dimensional mounting platform and array of apertures to described rear lower beam pipe, and positioning support angle bar lower end, rear lower beam pipe front portion is by being bolted to three-dimensional mounting platform postmedian and left and right is oppositely arranged, rear lower beam pipe anterior positioning support angle bar hypotenuse arrange backward and leading flank be fixedly connected with one after the anterior localization criteria protractor of lower beam pipe, the anterior localization criteria protractor of described rear lower beam pipe comprises the fixed block and moving block separately with a hinged end and a folding end, the hinged end of fixed block and moving block rotatably hinged and be provided with in hinged place for realize rotational angle location rotational angle alignment pin, described fixed block is all furnished with some installing holes according to the spacing consistent with the installing hole on three-dimensional mounting platform and array of apertures with on moving block, the fixed block of described rear lower beam pipe anterior location standard angle device vertically arrange and folding end downwards and by being horizontally fixed on rear lower beam pipe front portion positioning support angle bar leading flank by bolt, after two lower beam pipe anterior location standard angle device moving block between be laterally fixedly connected with one after lower beam pipe anterior location contiguous block, lower beam pipe anterior location boss after lower beam pipe forward position is provided with two after corresponding two of rear lower beam pipe anterior location contiguous block upper surface, rear lower beam pipe anterior location boss is provided with two confession rear lower beam pipe forward positions and snaps in the anterior locating slot of the rear lower beam pipe realizing location.

Like this, during use, first adjusting rear upper beam pipe anterior localization criteria protractor opening angle makes its moving block direction parallel with rear upper beam pipe, then upper beam pipe front end and laminating location, the main-beam pipe postmedian installation site after locating after two is made, then, after making rear upper beam pipe front waist section drop into two in the anterior positioning step of upper beam pipe, the location to rear upper beam pipe front waist section is realized; Fuel tank fore-stock medium position is fitted on fuel tank fore-stock positioning boss, two ends leg fits on rear upper beam pipe and corresponding installation site realizes locate, then leans on the installing hole of latch insertion fuel tank fore-stock and fuel tank fore-stock locating hole to realize fixing after to fuel tank fore-stock location; Again the installing hole of two on cushion rack is nested on the positioning round table of cushion rack locating dowel upper end, and makes cushion rack two ends leg fit to the location of realization to cushion rack, corresponding installation site on rear upper beam pipe; Adjust the opening angle of the anterior localization criteria protractor of rear lower beam pipe again, make its moving block parallel with rear lower beam pipe, then by corresponding installation site laminating on the engine suspension installing plate behind rear lower beam pipe front end and location, and rear lower beam pipe front portion is made to drop in the anterior locating slot of corresponding rear lower beam pipe the location realized rear lower beam pipe forward position.Like this, just achieve back rest pipe front waist section and the location of each Accessory Members on it, the disposable realization of welding gun can be adopted rear upper beam pipe and rear between lower beam pipe and vehicle frame proterosoma, and fuel tank fore-stock and being welded and fixed between cushion rack and rear upper beam pipe.Make each component relative-position error reliable and welding operation is convenient and swift, provide cost savings.Simultaneously, realize being connected and coordinating owing to have employed between support angle, standard angle device and three-dimensional mounting platform and other non-standard align members, make each location structure can carry out adjustment flexibly and easily as required to install, make it be suitable for very much sample trial-production to need to use when adjusting each component partial member position, dramatically saves on R&D costs.Meanwhile, wherein the non-standard align member of part can realize the location to multiple component simultaneously, and vibrational power flow is ingenious and ensure that the precision of mutual alignment.

As optimization, described back rest pipe rear portion positioning welding clamp structure comprises rear lower beam pipe rear portion positioning component, rear elastic axis and rear elastic axis journal stirrup positioning component, fuel tank after-poppet positioning component and car body covering journal stirrup positioning component;

Described rear lower beam pipe rear portion positioning component comprises the rear lower beam pipe rear portion positioning support angle bar of two entirety rectangular ladder-shaped frame structures, the each side of positioning support angle bar is all furnished with some installing holes according to the spacing consistent with the installing hole on three-dimensional mounting platform and array of apertures at described rear lower beam pipe rear portion, and positioning support angle bar lower end, rear lower beam pipe rear portion is by being bolted to three-dimensional mounting platform postmedian and left and right is oppositely arranged; Rear lower beam pipe rear portion positioning support angle bar hypotenuse arrange backward and medial surface upper position be fixedly connected with one after lower beam pipe rear portion locating piece, described rear lower beam pipe rear portion locating piece is provided with the rear lower beam pipe rear portion locating slot for embedding location for rear lower beam pipe rear portion;

Described rear elastic axis and rear elastic axis journal stirrup positioning component comprise the rear elastic axis locating piece that two are separately fixed at lower beam pipe rear portion positioning support angle bar top leading flank after two, inside front, rear elastic axis locating piece front end bend extend and after front end upper side is provided with elastic axis locating slot for realizing the location to rear elastic axis and rear elastic axis journal stirrup;

Described car body covering journal stirrup positioning component comprise two be separately fixed at two after positioning support angle bar top, lower beam pipe rear portion be positioned at the car body covering journal stirrup locating piece of the medial surface of position on rear elastic axis locating piece, car body covering journal stirrup locating piece has one and extends forward and the car body covering journal stirrup location division of lower surface for locating for the laminating of car body covering journal stirrup lower surface, installing hole on the corresponding car body covering of car body covering journal stirrup location division lower surface is provided with car body covering journal stirrup positioning bolt hole, car body covering journal stirrup positioning bolt hole is used for screwing in by bolt the location and clamping that realize car body covering journal stirrup,

Described fuel tank after-poppet positioning component comprises two and is symmetrically arranged and the fuel tank after-poppet positioning supports angle bar of overall L-shaped frame structure, two each sides of fuel tank after-poppet positioning supports angle bar is all furnished with some installing holes according to the spacing consistent with the installing hole on three-dimensional mounting platform and array of apertures and lower beam pipe rear portion positioning support angle bar anterior position after being arranged at two respectively; Two fuel tank after-poppet positioning supports angle bar medial surfaces are respectively fixedly installed a fuel tank after-poppet locating piece, fuel tank after-poppet locating piece has the fuel tank after-poppet location division that extends the location and lower surface is fitted for oil feeding reservoirs after-poppet upper surface rearwardly and upwardly, installing hole on the corresponding fuel tank after-poppet of fuel tank after-poppet location division lower surface is provided with fuel tank after-poppet positioning bolt hole, and fuel tank after-poppet positioning bolt hole is used for screwing in by bolt the location and clamping that realize fuel tank after-poppet.

Like this, during use, first oriented for front portion rear lower beam pipe rear portion is embedded in the locating slot of rear lower beam pipe rear portion, realizes the location to rear lower beam pipe; Again rear elastic axis is inserted in the rear damping axis hole of elastic axis journal stirrup after two, adjust rear elastic axis journal stirrup on rear elastic axis right position and after making elastic axis journal stirrup lower end fit to after corresponding installation site on upper beam pipe, and rear elastic axis two ends are dropped in rear elastic axis locating slot, realize the location to rear elastic axis and rear elastic axis journal stirrup simultaneously; Then car body covering journal stirrup front underside is fitted to corresponding installation site on rear elastic axis, after rear end upper surface and the laminating of car body covering journal stirrup location division lower surface, also screw in by bolt the location and the locking that realize car body covering journal stirrup; By corresponding installation site laminating on fuel tank after-poppet rear end and rear elastic axis, and its front end upper surface and the laminating of fuel tank after-poppet location division lower surface is made to screw in the location and the locking that realize fuel tank after-poppet again by bolt.Like this, just achieve back rest pipe rear section and the location of each Accessory Members on it, the disposable realization of welding gun being welded and fixed Accessory Members on it can be adopted.Make each component relative-position error reliable and welding operation is convenient and swift, provide cost savings.Simultaneously, realize being connected and coordinating owing to have employed between support angle, standard angle device and three-dimensional mounting platform and other non-standard align members, make each location structure can carry out adjustment flexibly and easily as required to install, make it be suitable for very much sample trial-production to need to use when adjusting each component partial member position, dramatically saves on R&D costs.Meanwhile, wherein the non-standard align member of part can realize the location to multiple component simultaneously, and vibrational power flow is ingenious and ensure that the precision of mutual alignment.

As optimization, described back rest pipe afterbody positioning welding clamp structure comprises rear upper beam pipe rear portion positioning component, cushion lock support positioning component and hood journal stirrup positioning component;

Described rear upper beam pipe rear portion positioning component comprises location, the rear upper beam pipe rear portion standard square chest of a rectangular body structure of entirety, the each side of standard square chest, location is all furnished with some installing holes according to the spacing consistent with the installing hole on three-dimensional mounting platform and array of apertures at described rear upper beam pipe rear portion, location, rear upper beam pipe rear portion standard square chest is by being bolted to three-dimensional mounting platform rear end medium position, described rear upper beam pipe rear portion positioning component also comprises a transverse direction and is fixed on upper beam pipe rear portion locating piece after of location, rear upper beam pipe rear portion standard square chest front side surface upper position, the left and right sides, locating piece front upper surface position, described rear upper beam pipe rear portion correspondence raises up and is formed with rear upper beam pipe rear portion positioning boss, rear upper beam pipe rear portion positioning boss is provided with the rear upper beam pipe rear portion locating slot for embedding location for rear upper beam pipe rear portion,

Described cushion lock support positioning component comprises the two cushion lock support locating dowels be symmetrical set in standard square chest upper surface, location, rear upper beam pipe rear portion, and cushion lock support locating dowel upper end is provided with cushion lock support positioning boss and realizes location for inserting for two installing holes of seat cushion lock support afterbody;

Described hood journal stirrup positioning component comprises two the hood journal stirrup location angle bar be symmetrical set in standard square chest left and right side, location, rear upper beam pipe rear portion upper end position, hood journal stirrup is located the overall L-shaped frame structure of angle bar and each side is all furnished with some installing holes according to the spacing consistent with the installing hole on three-dimensional mounting platform and array of apertures, angle bar bottom, hood journal stirrup location there is one backward laterally extending section and fixing by bolt after on front side of the standard square chest of location, upper beam pipe rear portion, the upper outside projection of hood journal stirrup location angle bar medial surface is equipped with hood journal stirrup locating piece, on hood journal stirrup locating piece, the installing hole of corresponding hood journal stirrup is provided with tapped through hole and screws in the location and clamping that realize hood journal stirrup by bolt.

Like this, during use, the rear portion first front portion having been completed the rear upper beam pipe of location drops in corresponding rear upper beam pipe rear portion locating slot, realizes the location to rear upper beam pipe rear portion; Then cushion lock pedestal lower end is fitted to installation site corresponding on rear upper beam pipe, and after making cushion lock support, two installing holes of upper end are nested on the positioning boss of cushion lock support locating dowel upper end, realize the location to cushion lock support; Again two hood journal stirrup the inners are fitted to the corresponding installation site on the cushion lock support behind location, and make two hood journal stirrup outer ends and the laminating of hood journal stirrup locating piece, screw in the installing hole on hood journal stirrup and the tapped through hole on hood journal stirrup locating piece by bolt again, realize the location of two hood journal stirrups and lock.Like this, just achieve rear upper beam pipe afterbody and the location of each Accessory Members on it, the disposable realization of welding gun being welded and fixed Accessory Members on it can be adopted.Make each component relative-position error reliable and welding operation is convenient and swift, provide cost savings.Simultaneously, realize being connected and coordinating owing to have employed between support angle, standard square chest and three-dimensional mounting platform and other non-standard align members, make each location structure can carry out adjustment flexibly and easily as required to install, make it be suitable for very much sample trial-production to need to use when adjusting each component partial member position, dramatically saves on R&D costs.Meanwhile, wherein the non-standard align member of part can realize the location to multiple component simultaneously, and vibrational power flow is ingenious and ensure that the precision of mutual alignment.

In sum, the utility model can simplify assemble welding operation, has simple to operate, with low cost, and can facilitate the advantages such as the trial-production adjustment of beam bending bicycle sample.

Accompanying drawing explanation

Fig. 1 is the side view of the optimum embodiment of the utility model.

Fig. 2 is the top view of the optimum embodiment of the utility model.

Side view when Fig. 3 is the embodiment use of the utility model optimum.

Top view when Fig. 4 is the embodiment use of the utility model optimum.

Detailed description of the invention

Below in conjunction with optimum embodiment and accompanying drawing, the utility model is described in further detail.When describing in scheme, be arranged on the state after on vehicle frame for orientation with it and describe benchmark.The bent-beam motorcycle frame of model LF110 described in vehicle frame described in scheme and background technology.

Optimum embodiment: as Figure 1-4, a kind of beam bending bicycle sample welding clamp of vehicle frame, wherein, described weld jig comprises upper surface and all side surfaces all have some installing holes three-dimensional mounting platform 1 according to constant spacing arranged in arrays, and is arranged on vehicle frame proterosoma positioning fixture structure, the anterior positioning welding clamp structure of back rest pipe, back rest pipe rear portion positioning welding clamp structure and the back rest pipe afterbody positioning welding clamp structure on three-dimensional mounting platform 1; Described vehicle frame proterosoma positioning fixture structure is for realizing the location to vehicle frame proterosoma; The anterior positioning welding clamp structure of described back rest pipe is for realizing the location of, fuel tank fore-stock 2 anterior to anterior, the rear upper beam pipe of rear lower beam pipe and cushion rack 3; Described back rest pipe rear portion positioning welding clamp structure is for realizing the location to rear lower beam pipe rear portion, rear elastic axis journal stirrup 4, rear elastic axis 5, fuel tank after-poppet 6 and car body covering journal stirrup 7; Described back rest pipe afterbody positioning welding clamp structure is for realizing the location to rear upper beam pipe rear portion, cushion lock support 8 and hood journal stirrup 9.

Wherein, described vehicle frame proterosoma positioning fixture structure comprises standpipe positioning component and bottom fork axis positioning component;

Described standpipe positioning component comprises the standpipe location standard square chest 10 of a rectangular body structure of entirety, the each side of standard square chest 10 is all furnished with some installing holes according to the spacing consistent with the installing hole on three-dimensional mounting platform 1 and array of apertures in described standpipe location, standpipe location standard square chest 10 is also upwards extended by being bolted to three-dimensional mounting platform 1 front Middle face, described standpipe positioning component also comprises the standpipe location standard angle device 11 that is fixed on standpipe location standard square chest 10 upper surface, described standpipe location standard angle device 11 comprises the fixed block and moving block separately with a hinged end and a folding end, the hinged end of fixed block and moving block rotatably hinged and be provided with in hinged place for realize rotational angle location rotational angle alignment pin, described fixed block is all furnished with some installing holes according to the spacing consistent with the installing hole on three-dimensional mounting platform and array of apertures with on moving block, the fixed block folding end of described standpipe location standard angle device 11 is arranged forward and is horizontally fixed on standpipe location standard square chest 10 upper surface by bolt, the moving block upper surface middle part of described standpipe location standard angle device 11 is upwards fixedly installed standpipe positioning round table 12, described standpipe positioning round table 12 diameter and lower riser end external diameter coupling and standpipe positioning round table axle center place coaxial on be provided with standpipe internal diameter coupling standpipe locating dowel 13, standpipe locating dowel 13 movable upper end is combined with the discoidal standpipe for compressing location rear profile tube and is fixed block 14, during concrete enforcement, standpipe is fixed block 14 and is screwed in a screwed hole at axle center place, standpipe locating dowel top by the threaded post arranged along its axis, realize standpipe in the mode by screwing by threaded post screw thread and be fixed the compression of block to location rear profile tube, structure is simple and compress convenient to operation.

Described bottom fork axis positioning component comprises the bottom fork axis positioning support angle bar 15 of two rectangular ladder-shaped frame structures of entirety, each side is all furnished with some installing holes according to the spacing consistent with the installing hole on three-dimensional mounting platform and array of apertures with described bottom fork axis positioning support angle bar 15, and bottom fork axis positioning support angle bar 15 lower end is oppositely arranged by being bolted in the middle part of three-dimensional mounting platform and left and right; Bottom fork axis positioning support angle bar 15 hypotenuse arranges backward and medial surface is fixedly installed the bottom fork axis locating piece 16 extended forward, width coupling in the Distance geometry engine suspension installing plate left and right sides between two bottom fork axis locating pieces 16, two front upper ends of bottom fork axis locating piece 16 are provided with bottom fork axis locating slot and for realizing the location to bottom fork axis two ends.

Wherein, the anterior positioning welding clamp structure of described back rest pipe comprises the anterior positioning component of rear upper beam pipe anterior positioning component, fuel tank fore-stock positioning component, cushion rack positioning component and rear lower beam pipe;

The anterior positioning component of described rear upper beam pipe comprises the anterior positioning support angle bar of rear upper beam pipe of two entirety rectangular ladder-shaped frame structures, the anterior each side of positioning support angle bar is all furnished with some installing holes according to the spacing consistent with the installing hole on three-dimensional mounting platform and array of apertures to described rear upper beam pipe, the anterior positioning support angle bar lower end of rear upper beam pipe is by be bolted in the middle part of three-dimensional mounting platform 1 and left and right is oppositely arranged (when specifically implementing, the anterior positioning support angle bar of described rear upper beam pipe and aforesaid bottom fork axis positioning support angle bar 15 are same component, more efficiently to utilize space dexterously, saving member also reduces costs), rear upper beam pipe anterior positioning support angle bar hypotenuse arrange backward and leading flank be fixedly connected with one after the anterior localization criteria protractor 17 of upper beam pipe, the anterior localization criteria protractor 17 of described rear upper beam pipe comprises the fixed block and moving block separately with a hinged end and a folding end, the hinged end of fixed block and moving block rotatably hinged and be provided with in hinged place for realize rotational angle location rotational angle alignment pin, described fixed block is all furnished with some installing holes according to the spacing consistent with the installing hole on three-dimensional mounting platform 1 and array of apertures with on moving block, the fixed block of described rear upper beam pipe anterior location standard angle device 17 vertically arrange and folding end downwards and by being horizontally fixed on rear upper beam pipe front portion positioning support angle bar leading flank by bolt, after two upper beam pipe anterior location standard angle device 17 moving block between be laterally fixedly connected with a lateral connection block 18, upper beam pipe anterior location boss 19 after upper beam pipe forward position is provided with two after corresponding two of lateral connection block 18 upper surface, rear upper beam pipe anterior location boss 19 medial surface is provided with for the anterior positioning step of rear upper beam pipe with laminating realization location, downside outside rear upper beam pipe front portion,

Described fuel tank fore-stock positioning component be included in described lateral connection block upper surface be positioned at two after upper beam pipe anterior location boss 19 between and the fuel tank fore-stock location division extended to form forward, described fuel tank fore-stock location division upper surface is provided with a fuel tank fore-stock positioning boss 20, fuel tank fore-stock positioning boss 20 upper surface is used for and the laminating of fuel tank fore-stock middle lower surface realizes location, on described fuel tank fore-stock positioning boss 20, the installing hole of corresponding fuel tank fore-stock is provided with fuel tank fore-stock locating hole and fuel tank fore-stock fastening screw 21 and fixing for what realize after to fuel tank fore-stock location,

Described cushion rack positioning component is included in described lateral connection block upper surface between upper beam pipe anterior location boss 19 and cushion rack location division formed that extends back after two, cushion rack location division upper surface is provided with two cushion rack locating dowels upwards, 22, two cushion rack locating dowel 22 upper ends and is provided with for inserting cushion rack positioning round table cushion rack realizing in two installing holes locate;

The anterior positioning component of described rear lower beam pipe comprises the anterior positioning support angle bar 23 of rear lower beam pipe of two entirety rectangular ladder-shaped frame structures, the anterior each side of positioning support angle bar 23 is all furnished with some installing holes according to the spacing consistent with the installing hole on three-dimensional mounting platform and array of apertures to described rear lower beam pipe, and positioning support angle bar 23 lower end, rear lower beam pipe front portion is by being bolted to three-dimensional mounting platform postmedian and left and right is oppositely arranged, rear lower beam pipe anterior positioning support angle bar 23 hypotenuse arrange backward and leading flank be fixedly connected with one after the anterior localization criteria protractor 24 of lower beam pipe, the anterior localization criteria protractor 24 of described rear lower beam pipe comprises the fixed block and moving block separately with a hinged end and a folding end, the hinged end of fixed block and moving block rotatably hinged and be provided with in hinged place for realize rotational angle location rotational angle alignment pin, described fixed block is all furnished with some installing holes according to the spacing consistent with the installing hole on three-dimensional mounting platform and array of apertures with on moving block, the fixed block of described rear lower beam pipe anterior location standard angle device 24 vertically arrange and folding end downwards and by being horizontally fixed on rear lower beam pipe front portion positioning support angle bar 23 leading flank by bolt, after two lower beam pipe anterior location standard angle device 24 moving block between be laterally fixedly connected with one after lower beam pipe anterior location contiguous block 25, lower beam pipe anterior location boss 26 after lower beam pipe forward position is provided with two after corresponding two of rear lower beam pipe anterior location contiguous block 25 upper surface, rear lower beam pipe anterior location boss 26 is provided with two confession rear lower beam pipe forward positions and snaps in the anterior locating slot of the rear lower beam pipe realizing location.

Wherein, described back rest pipe rear portion positioning welding clamp structure comprises rear lower beam pipe rear portion positioning component, rear elastic axis and rear elastic axis journal stirrup positioning component, fuel tank after-poppet positioning component and car body covering journal stirrup positioning component;

Described rear lower beam pipe rear portion positioning component comprises the rear lower beam pipe rear portion positioning support angle bar of two entirety rectangular ladder-shaped frame structures, the each side of positioning support angle bar is all furnished with some installing holes according to the spacing consistent with the installing hole on three-dimensional mounting platform and array of apertures at described rear lower beam pipe rear portion, positioning support angle bar lower end, rear lower beam pipe rear portion is by being bolted to three-dimensional mounting platform postmedian and left and right is oppositely arranged (when specifically implementing, described rear lower beam pipe rear portion positioning support angle bar and the anterior positioning support angle bar 23 of aforesaid rear lower beam pipe are same component, more efficiently to utilize space dexterously, saving member also reduces costs), rear lower beam pipe rear portion positioning support angle bar hypotenuse arrange backward and medial surface upper position be fixedly connected with one after lower beam pipe rear portion locating piece 27, described rear lower beam pipe rear portion locating piece 27 is provided with the rear lower beam pipe rear portion locating slot for embedding location for rear lower beam pipe rear portion,

Described rear elastic axis and rear elastic axis journal stirrup positioning component comprise the rear elastic axis locating piece 28 that two are separately fixed at lower beam pipe rear portion positioning support angle bar top leading flank after two, inside front, rear elastic axis locating piece 28 front end bend extend and after front end upper side is provided with elastic axis locating slot for realizing the location to rear elastic axis and rear elastic axis journal stirrup;

Described car body covering journal stirrup positioning component comprise two be separately fixed at two after positioning support angle bar top, lower beam pipe rear portion be positioned at the car body covering journal stirrup locating piece 29 of the medial surface of position on rear elastic axis locating piece, car body covering journal stirrup locating piece 29 has one and extends forward and the car body covering journal stirrup location division of lower surface for locating for the laminating of car body covering journal stirrup lower surface, installing hole on the corresponding car body covering of car body covering journal stirrup location division lower surface is provided with car body covering journal stirrup positioning bolt hole, car body covering journal stirrup positioning bolt hole is used for screwing in by bolt the location and clamping that realize car body covering journal stirrup,

Described fuel tank after-poppet positioning component comprises two and is symmetrically arranged and the fuel tank after-poppet positioning supports angle bar 30 of overall L-shaped frame structure, two each sides of fuel tank after-poppet positioning supports angle bar 30 are all furnished with some installing holes according to the spacing consistent with the installing hole on three-dimensional mounting platform and array of apertures and lower beam pipe rear portion positioning support angle bar anterior position (when specifically implementing after being arranged at two respectively, described fuel tank after-poppet positioning supports angle bar 30 lower surface is by being bolted to rear upper beam pipe anterior positioning support angle bar upper surface, more efficiently to utilize space dexterously, saving member also reduces costs), two fuel tank after-poppet positioning supports angle bar 30 medial surfaces are respectively fixedly installed a fuel tank after-poppet locating piece 31, fuel tank after-poppet locating piece 31 has the fuel tank after-poppet location division that extends the location and lower surface is fitted for oil feeding reservoirs after-poppet upper surface rearwardly and upwardly, installing hole on the corresponding fuel tank after-poppet of fuel tank after-poppet location division lower surface is provided with fuel tank after-poppet positioning bolt hole, and fuel tank after-poppet positioning bolt hole is used for screwing in by bolt the location and clamping that realize fuel tank after-poppet.

Wherein, described back rest pipe afterbody positioning welding clamp structure comprises rear upper beam pipe rear portion positioning component, cushion lock support positioning component and hood journal stirrup positioning component;

Described rear upper beam pipe rear portion positioning component comprises location, the rear upper beam pipe rear portion standard square chest 32 of a rectangular body structure of entirety, the each side of standard square chest 32 is all furnished with some installing holes according to the spacing consistent with the installing hole on three-dimensional mounting platform and array of apertures to location, described rear upper beam pipe rear portion, location, rear upper beam pipe rear portion standard square chest 32 is by being bolted to three-dimensional mounting platform 1 rear end medium position, described rear upper beam pipe rear portion positioning component also comprises a transverse direction and is fixed on upper beam pipe rear portion locating piece 33 after of location, rear upper beam pipe rear portion standard square chest 32 front side surface upper position, the left and right sides, locating piece 33 front upper surface position, described rear upper beam pipe rear portion correspondence raises up and is formed with rear upper beam pipe rear portion positioning boss 34, rear upper beam pipe rear portion positioning boss 34 is provided with the rear upper beam pipe rear portion locating slot for embedding location for rear upper beam pipe rear portion,

Described cushion lock support positioning component comprises the two cushion lock support locating dowels 35 be symmetrical set in standard square chest upper surface, location, rear upper beam pipe rear portion, and cushion lock support locating dowel 35 upper end is provided with cushion lock support positioning boss and realizes location for inserting for two installing holes of seat cushion lock support afterbody;

Described hood journal stirrup positioning component comprises two the hood journal stirrup location angle bar 36 be symmetrical set in standard square chest 32 left and right side, location, rear upper beam pipe rear portion upper end position, hood journal stirrup is located the overall L-shaped frame structure of angle bar 36 and each side is all furnished with some installing holes according to the spacing consistent with the installing hole on three-dimensional mounting platform and array of apertures, angle bar 36 bottom, hood journal stirrup location there is one backward laterally extending section and fixing by bolt after on front side of location, upper beam pipe rear portion standard square chest 32, the upper outside projection of hood journal stirrup location angle bar 36 medial surface is equipped with hood journal stirrup locating piece 37, on hood journal stirrup locating piece 37, the installing hole of corresponding hood journal stirrup is provided with tapped through hole and screws in the location and clamping that realize hood journal stirrup by bolt.

Claims

1. A frame welding fixture for a curved beam vehicle sample, characterized in that, the welding fixture includes a three-dimensional mounting platform with several mounting holes arranged in a fixed-space array on the upper surface and the peripheral side surface, and is arranged on a three-dimensional mounting platform. The positioning fixture structure of the front half of the frame on the platform, the positioning welding fixture structure of the front part of the rear beam tube, the positioning welding fixture structure of the rear part of the rear beam tube, and the positioning welding fixture structure of the rear part of the rear beam tube; The positioning of the front half of the vehicle frame; the positioning welding fixture structure of the front part of the rear beam tube is used to realize the positioning of the front part of the rear lower beam tube, the front part of the rear upper beam tube, the front bracket of the fuel tank and the seat cushion bracket; The internal positioning welding fixture structure is used to realize the positioning of the rear part of the rear lower beam tube, the rear shock absorbing shaft lug, the rear shock absorbing shaft, the fuel tank rear bracket and the vehicle body cover lug; the rear beam tube tail positioning welding fixture structure It is used to realize the positioning of the rear part of the rear upper beam tube, the seat cushion lock bracket and the tail cover lug.

2. The frame welding fixture for curved beam vehicle samples according to claim 1, wherein the positioning fixture structure for the front half of the frame includes a riser positioning assembly and a flat fork shaft positioning assembly;

The standpipe positioning assembly includes a standard square box for standpipe positioning with an overall rectangular structure, and each side of the standard square box for standpipe positioning is arrayed according to the same spacing and aperture as the installation holes on the three-dimensional installation platform A number of installation holes are arranged, and the standard square box for standpipe positioning is fixed on the middle part of the front side of the three-dimensional installation platform by bolts and extended upwards. A standard angler for pipe positioning, the standard angler for standpipe positioning includes a fixed block and a rotating block each having a hinged end and an opening and closing end, the hinged ends of the fixed block and the rotating block can be rotatably hinged, and a useful To realize the rotation angle positioning pin of the rotation angle positioning, several installation holes are arranged on the fixed block and the rotation block according to the same spacing and aperture array as the installation holes on the three-dimensional installation platform, and the standard angler is used for the positioning of the standpipe The opening and closing end of the fixed block is arranged forward and fixed horizontally on the upper surface of the standard square box for standpipe positioning by bolts. The middle part of the upper surface of the rotating block of the standard angler for standpipe positioning is fixed upward with a standpipe positioning round table. The diameter of the standpipe positioning round platform matches the outer diameter of the lower end of the standpipe, and the axis of the standpipe positioning round platform is coaxially provided with a standpipe positioning column matching the inner diameter of the standpipe, and the upper end of the standpipe positioning column is movable. The standpipe compression fixing block used to compress the standpipe after positioning;

The flat fork shaft positioning assembly includes two flat fork shaft positioning and supporting angle irons with an overall right-angled trapezoidal frame structure, and each side of the flat fork shaft positioning and supporting angle irons is at the same distance as the installation holes on the three-dimensional installation platform There are several installation holes arranged in the aperture array, and the lower end of the positioning support angle iron of the flat fork shaft is fixed on the middle part of the three-dimensional installation platform by bolts and arranged opposite to the left and right; The extended flat fork shaft positioning block, the distance between the two flat fork shaft positioning blocks matches the width of the left and right sides of the engine suspension mounting plate, the front upper end of the two flat fork shaft positioning blocks is provided with a flat fork shaft positioning groove and is used to achieve alignment The positioning of both ends of the fork shaft.

3. The frame welding fixture for curved beam vehicle samples according to claim 1, wherein the fixture structure for positioning the front portion of the rear beam tube includes a positioning assembly for the front portion of the rear upper beam tube, a positioning assembly for the front bracket of the fuel tank, Seat cushion bracket positioning assembly and rear lower beam tube front positioning assembly;

The positioning assembly for the front part of the rear upper beam tube includes two positioning and supporting angle irons for the front part of the rear upper beam tube in a right-angled trapezoidal frame structure. The installation holes on the installation platform are arranged in a consistent spacing and aperture array with several installation holes. The lower end of the positioning support angle iron at the front of the rear upper beam tube is fixed to the middle of the three-dimensional installation platform by bolts and is set opposite to the left and right; the front positioning support of the rear upper beam tube The hypotenuse of the angle iron is arranged backward and the front side is fixedly connected with a standard angler for positioning the front part of the rear upper beam tube. And the rotating block, the hinged ends of the fixed block and the rotating block can be rotatably hinged and the rotating angle positioning pin for realizing the positioning of the rotating angle is arranged at the hinge, and the fixing block and the rotating block are all according to the mounting holes on the three-dimensional installation platform A number of mounting holes are arranged in a uniform spacing and aperture array, and the front part of the rear upper beam tube is positioned vertically with a fixed block of a standard angler, and the opening and closing end is downward and horizontally fixed on the front part of the rear upper beam tube by bolts The front side of the positioning support angle iron; a horizontal connecting block is fixedly connected horizontally between the rotating blocks of the standard angler used for positioning the front of the two rear upper beam tubes, and the upper surface of the horizontal connecting block is set corresponding to the front positions of the two rear upper beam tubes There are two bosses for positioning the front part of the rear upper beam tube, and the inner side of the boss for positioning the front part of the rear upper beam tube is provided with a front part of the rear upper beam tube for positioning with the outer and lower sides of the front part of the rear upper beam tube positioning steps;

The fuel tank front bracket positioning assembly includes a fuel tank front bracket positioning part that is formed on the upper surface of the transverse connection block between the two rear upper beam tube front positioning bosses and extends forward. The fuel tank front bracket positioning part The upper surface is provided with a fuel tank front bracket positioning boss, the upper surface of the fuel tank front bracket positioning boss is used to fit the lower surface of the fuel tank front bracket middle part to achieve positioning, and the fuel tank front bracket positioning boss corresponds to the installation hole of the fuel tank front bracket It is provided with the positioning hole of the front support of the fuel tank and the positioning pin of the front support of the fuel tank, and is used to realize the fixing after the positioning of the front support of the fuel tank;

The seat cushion bracket positioning assembly includes a seat cushion bracket positioning part formed on the upper surface of the transverse connecting block between the front positioning bosses of the two rear upper beam tubes and extending backward, the upper surface of the seat cushion bracket positioning part There are two upward seat cushion bracket positioning columns, and the upper ends of the two seat cushion bracket positioning columns are provided with seat cushion bracket positioning round tables for inserting into the two mounting holes on the seat cushion bracket for positioning;

The positioning assembly for the front part of the rear lower beam tube includes two positioning and supporting angle irons for the front part of the rear lower beam tube in a right-angled trapezoidal frame structure. The installation holes on the installation platform are arranged in a consistent spacing and aperture array with several installation holes. The lower end of the positioning support angle iron at the front of the rear lower beam tube is fixed to the middle and rear of the three-dimensional installation platform by bolts and is set opposite to the left and right; the front of the rear lower beam tube The hypotenuse of the positioning support angle iron is arranged backwards and the front side is fixedly connected with a positioning standard angler at the front of the rear lower beam tube. The standard angler at the front of the rear lower beam tube includes a hinged end and an opening end respectively The fixed block and the rotating block, the hinge ends of the fixed block and the rotating block can be rotatably hinged and the rotation angle positioning pin for realizing the rotation angle positioning is arranged at the hinge, and the fixed block and the rotating block are all according to the three-dimensional installation platform. The installation holes are arranged in a consistent spacing and aperture array with a number of installation holes. The front part of the rear lower beam tube is positioned vertically with a fixed block of a standard angler, and the opening and closing ends are downward and fixed horizontally on the rear lower beam tube by bolts. The front side of the front positioning support angle iron; the rotating blocks of the standard angler used for positioning the front of the two rear lower beam tubes are horizontally fixedly connected with a connecting block for positioning the front part of the rear lower beam tube, and the front positioning of the rear lower beam tube The upper surface of the connecting block corresponds to the front positions of the two rear lower beam tubes, and there are two rear lower beam tube front positioning bosses, and the rear lower beam tube front positioning bosses are provided with two rear lower beam tube positioning bosses. The front position snaps into the positioning groove at the front of the rear lower beam tube for positioning.

4. The frame welding fixture for curved beam vehicle samples according to claim 1, wherein the fixture structure for positioning welding at the rear of the rear beam tube includes a positioning assembly at the rear of the rear lower beam tube, a rear shock absorber shaft and a rear Lug positioning assembly for shock absorbing shaft, positioning assembly for fuel tank rear bracket and positioning assembly for lug positioning assembly of car body cover;

The positioning assembly at the rear of the rear lower beam tube includes two positioning support angle irons at the rear of the rear lower beam tube in a right-angled trapezoidal frame structure. The installation holes on the installation platform are arranged in a consistent spacing and aperture array with a number of installation holes. The lower end of the positioning support angle iron at the rear of the rear lower beam tube is fixed to the middle and rear of the three-dimensional installation platform by bolts and is set opposite to the left and right; the rear of the rear lower beam tube The hypotenuse of the positioning support angle iron is arranged backward, and the upper position of the inner surface is fixedly connected with a positioning block at the rear of the rear lower beam tube. The positioning groove at the rear of the rear lower beam tube;

The rear shock absorber shaft and the rear shock absorber shaft lug positioning assembly include two rear shock absorber shaft positioning blocks respectively fixed on the front side of the upper part of the positioning support angle iron at the rear of the two rear lower beam tubes, and the rear shock absorber shaft positioning block The front end is bent and extended inwardly and forwardly, and a rear shock absorber shaft positioning groove is provided on the upper side of the front end to realize the positioning of the rear shock absorber shaft and the rear shock absorber shaft lug;

The vehicle body cover lug positioning assembly includes two vehicle body cover lug positioning components respectively fixed on the inner side of the upper part of the positioning support angle iron at the rear of the two rear lower beam tubes above the positioning block of the rear shock absorber shaft. Block, the positioning block of the vehicle body cover lug has a vehicle body cover lug positioning part that extends forward and the lower surface is used for positioning the lower surface of the vehicle body cover lug. The mounting holes on the surface corresponding to the body cover are provided with positioning bolt holes for the lugs of the body cover, and the positioning bolt holes for the lugs of the body cover are used for positioning and clamping the lugs of the body cover by screwing in the bolts ;

The fuel tank rear bracket positioning assembly includes two left and right symmetrical arrangements and an overall L-shaped frame structure for positioning and supporting angle irons for the fuel tank rear brackets. The hole spacing and hole diameter array are arranged with a number of installation holes, which are respectively set in the front of the positioning support angle iron at the rear of the two rear lower beam tubes; the inner sides of the positioning support angle iron of the two fuel tank rear brackets are each fixed with a fuel tank rear support Positioning block, the positioning block of the fuel tank rear bracket has a fuel tank rear bracket positioning part extending backward and upward and the lower surface is used for fitting and positioning the upper surface of the fuel tank rear bracket. The lower surface of the fuel tank rear bracket positioning part is set corresponding to the installation hole on the fuel tank rear bracket There are positioning bolt holes for the rear support of the fuel tank, and the positioning bolt holes for the rear support of the fuel tank are used for positioning and clamping the rear support of the fuel tank by screwing in the bolts.

5. The frame welding fixture for curved beam vehicle samples according to claim 1, wherein the positioning welding fixture structure at the tail of the rear beam tube includes a positioning assembly at the rear of the rear upper beam tube, a positioning assembly for a seat cushion lock bracket and Tail cover lug positioning assembly;

The rear upper beam tube rear positioning assembly includes a standard square box for positioning the rear upper beam tube rear with a rectangular structure as a whole. The installation holes on the installation platform are arranged in a consistent spacing and aperture array with a number of installation holes. The rear part of the rear upper beam tube is positioned in the middle of the rear end of the three-dimensional installation platform with a standard square box. The rear part of the rear upper beam tube is positioned The assembly also includes a positioning block at the rear of the rear upper beam tube which is horizontally fixed on the upper part of the front surface of the standard square box used for positioning the rear of the rear upper beam tube. The two sides correspondingly protrude upward to form a positioning boss at the rear of the rear upper beam tube, and the positioning boss at the rear of the rear upper beam tube is provided with a positioning groove at the rear of the rear upper beam tube for embedded positioning at the rear of the rear upper beam tube;

The seat cushion lock bracket positioning assembly includes two seat cushion lock support positioning columns symmetrically arranged on the upper end surface of the standard square box for positioning the rear upper beam tube, and the seat cushion lock support positioning column is provided with a seat cushion lock bracket positioning column. The boss is used to insert into the two mounting holes at the end of the seat cushion lock bracket to achieve positioning;

The tail cover lug positioning assembly includes two tail cover lug positioning angle irons symmetrically arranged on the upper ends of the left and right sides of the standard square box for positioning the rear upper beam tube. The tail cover lug positioning angle iron is L-shaped as a whole. Frame structure and a number of installation holes are arranged on each side according to the same spacing and aperture array as the installation holes on the three-dimensional installation platform. The lower part of the tail cover lug positioning angle iron has a backward transverse extension and is fixed by bolts The front side of the standard square box is used for positioning the rear of the beam tube. The tail cover lug positioning block is provided on the inner side of the tail cover lug positioning angle iron. The threaded through hole is screwed in by the bolt to realize the positioning and clamping of the lug of the tail cover.