CN105364329B - A kind of anterior segment structure processing method of knight's car sample vehicle frame - Google Patents

Abstract

The invention discloses a kind of anterior segment structure processing method of knight's car sample vehicle frame, it is characterized in that, head tube is first completed using weld jig, preceding inclined tube, main-beam pipe front waist section, head tube connecting plate, direction limited block, radiator journal stirrup, the positioning of two engine front overhang hanging scrolls and fuel tank installation axle, being welded and fixed for above-mentioned component is disposably completed using welding gun again, the structure setting of main-beam pipe front waist section positioning is wherein realized on a component set along the longitudinal direction and the component rear end is located at immediately below main-beam pipe and connecting tube connecting position and rotatably regulation is set, complete after above-mentioned welding rotate adjust the component to connecting tube parastate after, the positioning to connecting tube is realized using the structure of main-beam pipe front waist section positioning is realized on the component, being welded and fixed for connecting tube is realized again.The present invention can simplify assemble welding process, with low cost with simple to operate, and can facilitate the advantages of trial-production of knight's car sample front waist section is adjusted.

Description

A processing method for the structure of the front section of the frame of a rider bike sample

technical field

The invention relates to the field of motorcycle frame processing, in particular to a method for processing the front section structure of a rider bike sample frame.

Background technique

Among the motorcycles, riding motorcycles, as a classic model, have the advantages of high power and good long-distance driving performance, and are deeply loved by consumers. At the same time, in the process of motorcycle research and development, it is often necessary to develop and design sample products first, and then conduct tests to ensure the reliability and practicability of the final product.

In a new riding motorcycle model LF-150-10b, the main structure of the frame includes a head tube. The front end of the main beam tube is connected backwards, the second half of the main beam tube is bent downward along the middle position and connected to the engine suspension mounting frame at the rear end, the rear middle of the head tube is fixedly connected with the head tube connecting plate, and the head tube is connected The top of the plate is fixed to the lower side of the front part of the main beam tube, the lower end of the head tube connecting plate is fixed to the front part of the front inclined tube, and the middle part of the rear upper side of the front inclined tube and the front lower surface of the bend in the middle of the main beam tube are also obliquely There is a connecting pipe for fixed connection; an upper pipe extending backward is respectively connected to the upper and rear sides of the bending part of the middle part of the main beam pipe, and two lower pipes are arranged extending backward and upward on both sides of the engine suspension mounting The rear upper ends of the two lower tubes are fixedly connected to the lower surface of the second half of the two upper tubes, and the end sections of the two upper tubes are juxtaposed to extend obliquely upward and backward.

The complete LF-150-10b new riding motorcycle frame, on the basis of the main structure of the above frame, also needs to install a direction limit block on the front side of the upper end of the head tube, and a fixed connection through the lower end of the front inclined tube There are two engine front suspension shafts, and a fuel tank installation shaft is horizontally penetrated and fixed in the middle of the head pipe connecting plate, and a radiator lug for installing the radiator needs to be fixedly welded on the left and right sides of the front half of the front inclined pipe. The left side and the rear side of the upper end of the rear section of the main beam tube also need to be welded and fixed with a battery lug for installing the battery, and a front reinforcement needs to be welded and fixed between the upper part of the rear section of the main beam tube and the front ends of the two upper tubes block, the upper and lower positions of the front side of the engine suspension mounting bracket need to be set horizontally through the upper rear suspension shaft of the engine and the lower rear suspension shaft of the engine, and a side cover lock support needs to be welded and fixed at the front position of the middle part of the right side of the engine suspension mounting bracket Ears, the middle part of the engine suspension mounting frame also needs to be set horizontally through the flat fork shaft. There is also an air filter bracket fixed horizontally between them; the upper end of the lower tube on the left is also welded and fixed with an electrical component lug, and the rear part of the upper tube and the front of the connection position of the lower tube are also welded and fixed downward with a side cover rear support There is also a rear reinforcing plate welded and fixed between the lower side of the lower tube and the lower side of the upper tube, and a cushion lock bracket is welded and fixed downward on the outer rear of the rear reinforcing plate. There is a fast seat cushion rear bracket fixed by the lap joint, and a tail cover bracket is welded and fixed horizontally under the tail end of the upper tube.

For the above-mentioned frame structure, during the production of motorcycle R&D samples, it is usually divided into steps to sequentially complete the welding and fixing of each component in the frame main body and each accessory component thereon; and then weld and fix the components of the frame body in sequence. Like this, there are numerous working procedures, complicated operation, and the defects that the cost is too high. In particular, since sample production often requires adjustments to the installation positions and installation angles of some local components, welding fixtures with fixed structures are used for each adjustment, which greatly increases the cost and restricts the expansion of sample research and development. Especially when the front section of the vehicle frame is welded and processed, the above-mentioned problems and defects are particularly prominent.

Contents of the invention

Aiming at the deficiencies of the above-mentioned prior art, the technical problem to be solved by the present invention is: how to provide a front part of the rider bike sample frame that can simplify the process, make it easy to operate, low in cost, and further make it convenient for trial production and adjustment. Segment structure processing method.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solution: when the solution involves orientation description, the state after installation is used as the orientation description reference.

A method for processing the structure of the front section of the frame of a knight car sample, which is characterized in that the head tube, the front inclined tube, the front section of the main beam tube, the head tube connecting plate, the direction limit block, and the radiator are firstly completed by using a welding fixture. The positioning of the lugs, the two front suspension shafts of the engine and the installation shaft of the fuel tank, and then use a welding torch to complete the welding and fixing of the above components at one time. The rear end of the component is located directly below the junction of the main beam tube and the connecting tube and can be rotated and adjusted. After the above-mentioned welding is completed, the component is rotated and adjusted to be parallel to the connecting tube, and the front section of the main beam tube is positioned on this component. The structure is used to realize the positioning of the connecting pipe, and then realize the welding and fixing of the connecting pipe.

In this way, the method can greatly improve the processing efficiency, and at the same time, can avoid interference, conveniently and quickly realize the clamping and welding of the connecting pipe, and greatly improve the overall welding efficiency of the vehicle frame.

The welding fixture used in it includes a three-dimensional installation platform with several mounting holes arranged in a fixed-space array on the upper surface and the peripheral surface, and a head tube positioning component for realizing the positioning of the head tube, and a positioning of the direction limit block. The direction limit block positioning assembly, the head pipe connection plate and fuel tank installation shaft positioning assembly for the positioning of the head pipe connection plate and the fuel tank installation shaft, the radiator lug positioning assembly for the radiator lug positioning, for The front inclined tube and the engine front suspension shaft positioning assembly for positioning the front inclined tube and the engine front suspension shaft, and the main beam tube front section and connecting tube positioning assembly for sequentially positioning the front section of the main beam tube and the connecting tube respectively.

In this way, the welding fixture structure can realize the positioning and installation of the main body of the front section of the rider bike sample frame and the auxiliary components on it. After positioning, it is convenient to use a welding torch to complete the welding and fixing between the components quickly and sequentially. The mutual position accuracy of each component is reliable and the welding operation is convenient and quick, which saves the cost.

As an optimization, the head tube positioning assembly includes a standard square box for head tube positioning with an overall rectangular structure, and each side of the standard square box for head tube positioning is at the same distance as the installation holes on the three-dimensional installation platform. There are several mounting holes arranged in the aperture array, and the standard square box for head tube positioning is fixed on the middle of the front side of the three-dimensional installation platform by bolts; the upper end of the standard square box for head tube positioning is fixedly provided with a standard angler for head tube positioning The standard angler for the positioning of the head tube 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 are rotatably hinged and are provided at the hinge for realizing rotation angle positioning The rotation angle positioning pin, the fixed block and the rotating block are arranged with a number of installation holes according to the same spacing and aperture array as the installation holes on the three-dimensional installation platform, and the opening and closing end of the fixed block of the standard angler is used for the positioning of the head tube Arranged forward and horizontally fixed on the upper end of the standard square box for head tube positioning by bolts, the middle part of the upper surface of the rotating block of the standard angler for the head tube positioning is fixed upwardly with a head tube positioning round table, the diameter of the head tube positioning round table and The outer diameter of the lower end of the head tube is matched, and a head tube positioning post matching the inner diameter of the head tube is arranged coaxially at the axis of the head tube positioning round table.

This is not only convenient for clamping and positioning, but also more convenient for its flexible adjustment to meet the requirements of sample adjustment.

As an optimization, the positioning assembly of the direction limiting block includes a supporting angle iron for positioning the direction limiting block with an overall L-shaped structure. There are several mounting holes arranged in an array of the same spacing and apertures on the mounting holes. The lower surface of the supporting angle iron for the positioning of the direction limiting block is fitted and fixed by bolts on the upper surface of the rotating block of the standard angler for positioning the head tube. The direction limiting block The upper part of the rear side of the supporting angle iron for positioning the position block is fixedly provided with a direction limiting block positioning block, one end of the direction limiting block positioning block is fixed on the upper part of the rear side of the supporting angle iron used for the positioning of the head tube accessories, and the other end extends backward and downward The end has a protrusion for inserting into the two grooves on the direction limiting block to realize the positioning of the direction limiting block.

This is not only convenient for clamping and positioning, but also more convenient for its flexible adjustment to meet the requirements of sample adjustment.

As an optimization, the head pipe connecting plate and the fuel tank installation shaft positioning assembly include two supporting angle irons for positioning the fuel tank installation shaft in an L-shaped structure as a whole. The installation holes on the three-dimensional installation platform are arranged in an array with consistent spacing and aperture. Several installation holes are arranged. The side surfaces of the supporting angle irons for the positioning of the two fuel tank installation shafts are respectively fitted and fixed on the left and right sides of the upper end of the standard square box for the positioning of the head tube by bolts. The upper side of the supporting angle iron for the positioning of the fuel tank installation shaft is a horizontal surface and an L-shaped connecting block for the positioning of the fuel tank mounting shaft is fixed on the rear part of the upper side by bolts, and the upper end of the connecting block for positioning the fuel tank mounting shaft is fixedly provided with a fuel tank mounting shaft Positioning block, fuel tank installation shaft The upper surface of the positioning block is provided with a fuel tank installation shaft positioning groove for the two ends of the fuel tank installation shaft to fall into and locate.

This is not only convenient for clamping and positioning, but also more convenient for its flexible adjustment to meet the requirements of sample adjustment.

As an optimization, the radiator lug positioning assembly includes two radiator lug positioning blocks, the lower surfaces of the two radiator lug positioning blocks are respectively fitted and fixed to the upper sides of the two oil tank installation shaft positioning support angle irons by bolts At the front position, the rear upper end of the radiator lug positioning block has a radiator lug positioning surface for fitting and positioning with the front lower side of the radiator lug, and the radiator lug positioning surface is provided with radiator lug positioning holes and The positioning pin of the radiator lug is used to pass through the lug hole on the radiator lug and the positioning hole of the radiator lug to realize the positioning and locking of the radiator lug.

This is not only convenient for clamping and positioning, but also more convenient for its flexible adjustment to meet the requirements of sample adjustment.

As an optimization, the front inclined pipe and the engine front suspension shaft positioning assembly include a standard square box for engine front suspension shaft positioning with a rectangular structure as a whole, and each side of the engine front suspension shaft positioning standard box is in accordance with The mounting holes on the three-dimensional installation platform are arranged in a consistent spacing and hole array. Several installation holes are arranged. The standard square box used for the positioning of the front suspension shaft of the engine is fixed to the corresponding position in the middle of the front end of the three-dimensional installation platform by bolts; the standard square box is used for the positioning of the front suspension shaft of the engine. The two sides are vertically fixed by bolts and provided with a positioning plate for the front suspension shaft of the engine. The rear end of the positioning plate for the front suspension shaft of the engine extends backward out of the standard square box used for positioning the front suspension shaft of the engine, and two front suspension shafts of the engine are arranged transversely opposite to each other. Positioning holes, the two engine front suspension shaft positioning holes are used for the two engine front suspension shaft ends to penetrate to achieve positioning.

This is not only convenient for clamping and positioning, but also more convenient for its flexible adjustment to meet the requirements of sample adjustment.

As an optimization, the front section of the main beam tube and the positioning assembly of the connecting tube include a standard square box for the front section of the main beam tube and the positioning of the connecting tube in an overall rectangular structure, the front section of the main beam tube and the connecting tube A number of installation holes are arranged on each side of the standard square box for positioning according to the same spacing and aperture array as the installation holes on the three-dimensional installation platform. The position on the right side of the rear of the standard square box used for positioning the front suspension shaft of the engine on the platform; the left side of the standard square box used for positioning the front section of the main beam tube and the connecting pipe is fixedly provided with a standard angle for positioning the front section of the main beam tube and the connecting pipe The standard angler for positioning the front section of the main beam tube and the connecting pipe 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 at the hinge There are rotation angle positioning pins for positioning the rotation angle, and 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. The front part of the main beam tube The opening and closing ends of the fixed block of the standard angler for the positioning of sections and connecting pipes are arranged downwards, and the fixed block is horizontally fixed on the front section of the main beam tube and the upper left side of the standard square box for positioning of the connecting pipes by bolts. The standard angler for positioning the front section and the connecting pipe The hinged end of the fixed block and the rotating block is located directly below the connection position between the front section of the main beam tube and the connecting pipe, and the standard angler for positioning the front section of the main beam tube and the connecting pipe The rotating block is arranged along the front-to-back direction, and the middle part of the upper surface is fixed upward with the front section of the main beam tube and the positioning block of the connecting tube. The front section of the main beam tube and the positioning block of the connecting tube are provided with the front section of the main beam tube and the positioning groove of the connecting pipe, and can be used to realize the sequential positioning of the front section of the main beam pipe and the connecting pipe.

In this way, when in use, first adjust the angle of the head tube positioning standard angler to the required angle, and then insert the head tube into the head tube positioning column so that the lower end and the head tube positioning round table abut and support and realize Positioning of the head tube: attach the rear end of the direction limit block to the installation position of the upper end of the head tube, and insert the protrusion at the rear end of the direction limit block positioning block into the two grooves abutting on the direction limit block , to realize the positioning of the limit block in the opposite direction; the upper front end of the front inclined tube is abutted against the corresponding position on the rear side of the head tube, so that the lower end of the front inclined tube falls between the two engine front suspension shaft positioning plates, and the two engine front The suspension shaft passes through the engine front suspension shaft positioning holes on the two engine front suspension shaft positioning plates and the installation hole on the front inclined pipe, so that the engine front suspension shaft and the front inclined pipe can be positioned at the same time; The inner end of the lug is attached to the corresponding installation position outside the front inclined pipe, so that the front and lower side of the outer end of the radiator lug is fitted to the radiator lug positioning surface on the radiator lug positioning block, and the radiator lug is adopted The positioning pin is inserted into the radiator lug hole and the radiator lug positioning hole to realize the positioning and locking of the radiator lug; to position the front section of the main beam tube and the connecting pipe, use the rotating block of the standard angler to rotate and adjust to the position of the main beam. The front section of the main beam tube is parallel to the position, and then the front end of the main beam tube is abutted against the corresponding installation position on the upper part of the rear side of the head tube, and the front section of the main beam tube falls into the main beam on the front section of the main beam tube and the positioning block of the connecting tube. The front section of the tube and the positioning groove of the connecting tube are used to locate the front section of the main beam tube; the front end, upper end and lower end of the connecting plate of the head tube are respectively installed correspondingly to the front section of the front tube, the front section of the main beam tube and the front inclined tube The positions are close to each other, and the fuel tank installation shaft is passed through the assembly hole on the head tube connecting plate horizontally, and the two ends of the fuel tank mounting shaft fall into the positioning groove of the fuel tank mounting shaft, so that the installation of the fuel tank shaft and the head tube connecting plate can be realized at the same time. After the positioning of the above-mentioned components is completed, the welding and fixing between the above-mentioned components can be completed at one time with a welding torch; then the front section of the main beam tube and the connecting tube are positioned with the front end of the rotating block of the standard angler downward Rotate and adjust to the parallel position with the connecting pipe, then respectively touch the two ends of the connecting pipe to the corresponding installation positions on the front inclined pipe and the main beam tube, and drop the middle of the connecting pipe into the front section of the main beam tube and the positioning block of the connecting pipe The front part of the main beam tube and the positioning groove of the connecting pipe on the upper part are used to realize the positioning of the connecting pipe; then the welding torch is used to complete the welding of the two ends of the connecting pipe; . The mutual position accuracy of each component is reliable and the welding operation is convenient and quick, which saves the cost. At the same time, due to the use of standard square boxes, supporting angle irons, standard anglers, three-dimensional installation platforms and other non-standard positioning components to achieve connection and cooperation, each positioning structure can be flexibly and conveniently adjusted and installed according to needs, making it very It is suitable for use when trial production of samples needs to adjust the position of local components of each component, which greatly saves the cost of research and development. At the same time, some of the non-standard positioning components can realize the positioning of multiple components at the same time, and the structural arrangement is ingenious and ensures the accuracy of mutual positions. In particular, the structural setting of the front section of the main beam tube and the positioning assembly of the connecting tube enables it to complete the clamping and welding of the front section of the main beam tube and the connecting tube in sequence, avoiding mutual interference, and greatly improving the overall welding efficiency of the frame .

To sum up, the present invention can simplify the welding and assembly process, has the advantages of simple operation, low cost, and can facilitate the trial production and adjustment of the front section of the rider bike sample.

Description of drawings

Fig. 1 is a front view of a frame welding jig for a rider bike sample required for the implementation of the present invention.

FIG. 2 is a top view of FIG. 1 .

Fig. 3 is a front view of Fig. 1 when in use.

FIG. 4 is a top view of FIG. 3 .

detailed description

The present invention will be further described in detail below in conjunction with a frame welding jig for a rider bike sample used when the method is implemented and the accompanying drawings.

Optimum implementation mode: as shown in Figure 1-4, a frame welding fixture for a rider bike sample required for the implementation of this method includes a number of mounting holes arranged in an array at fixed intervals on the upper surface and the peripheral side surface The three-dimensional installation platform 1, and the positioning welding fixture structure of the front section of the vehicle frame, the positioning welding fixture structure of the middle section of the vehicle frame and the positioning welding fixture structure of the rear section of the vehicle frame arranged on the three-dimensional installation platform 1; the front section of the vehicle frame The positioning welding fixture structure is used to realize the alignment of the head tube 2, the front inclined tube 3, the front section of the main beam tube 4, the head tube connecting plate 5, the connecting pipe 6, the direction limit block 7, the radiator lug 8, and the two engine The positioning of the front suspension shaft 9 and the fuel tank installation shaft 10; the positioning welding fixture structure of the middle section of the vehicle frame is used to realize the engine suspension installation frame 11, the upper suspension shaft 12 after the engine, the lower suspension shaft 13 and the flat fork shaft 14 after the engine , the positioning of side cover lock lug 15, battery lug 16, front reinforcement block 17, upper tube front section 18, air filter bracket 19, down tube front section 20 and side cover lower lug 21; the vehicle frame The rear section positioning welding fixture structure is used to realize the alignment of the rear section 22 of the lower tube, the electrical device lug 23, the side cover rear lug 24, the upper tube tail section 25, the rear reinforcement plate 26, the seat cushion lock bracket 27, and the seat cushion The positioning of the rear support 28 and the tail cover support 29.

In this way, the welding fixture of the above-mentioned solution can realize the clamping and positioning of the front, middle and rear parts of the frame main body and the auxiliary components thereon at the same time. After positioning, the welding gun can be directly used to quickly realize the welding and fixing between the components. . The mutual position accuracy of each component is reliable and the welding operation is convenient and fast, which greatly saves the cost.

Wherein, the positioning welding jig structure of the front section of the vehicle frame includes a head tube positioning assembly, a direction limit block positioning assembly, a head pipe connecting plate and a fuel tank installation shaft positioning assembly, a radiator lug positioning assembly, a front inclined pipe and an engine front Suspension shaft positioning components, main beam tube front section and connecting tube positioning components;

The head tube positioning assembly includes a standard square box 30 for head tube positioning with a rectangular structure as a whole, and each side of the standard square box 30 for head tube positioning is at a distance consistent with the mounting holes on the three-dimensional mounting platform and The aperture array is arranged with several installation holes, and the standard square box 30 for head tube positioning is fixed on the middle position of the front side of the three-dimensional installation platform 1 by bolts; the upper end of the standard square box 30 for head tube positioning is fixedly provided with a standard The angler 31, the standard angler 31 for the positioning of the head tube includes a fixed block and a rotating block each having a hinged end and an opening and closing end. The rotation angle positioning pin of the rotation angle positioning, the fixed block and the rotation block are arranged with a number of installation holes according to the same spacing and aperture array as the installation holes on the three-dimensional installation platform, and the head tube positioning is provided with a standard angler 31 The opening and closing end of the fixed block is arranged forward and fixed horizontally on the upper end of the standard square box 30 for positioning the head tube by bolts. The middle part of the upper surface of the rotating block of the standard angler 31 for positioning the head tube is fixedly provided with a round table 32 for positioning the head tube upward. The diameter of the head tube positioning round platform 32 is matched with the outer diameter of the lower end of the head tube, and the head tube positioning column 33 is arranged on the same axis as the head tube inner diameter at the center of the head tube positioning round platform;

The direction limiting block positioning assembly includes a supporting angle iron 34 for positioning the direction limiting block with an overall L-shaped structure, and each side of the supporting angle iron 34 for positioning the direction limiting block is in accordance with the three-dimensional installation platform 1 There are several mounting holes arranged in the same spacing and aperture array of the mounting holes on the top, and the lower surface of the support angle iron 34 for the positioning of the direction limit block is fitted and fixed on the upper surface of the rotating block of the standard angler 31 for the positioning of the head tube by bolts. The direction limit block positioning is fixedly provided with a direction limit block locating block 35 with the supporting angle iron 34 rear side upper part, and the direction limiting block locating block 35 one ends are fixed on the headstock pipe accessory positioning with the supporting angle iron rear side upper part, and the other end The rear bottom extends and has a protrusion at the end for inserting into the two grooves on the direction limiting block 7 to realize the positioning of the direction limiting block;

The head pipe connecting plate and the fuel tank installation shaft positioning assembly include two support angle irons 36 for fuel tank installation shaft positioning in an overall L-shaped structure. The mounting holes on the mounting platform are arranged in a consistent spacing and aperture array with a number of mounting holes, and the side surfaces of the supporting angle irons 36 for the positioning of the mounting shaft of the two fuel tanks are attached respectively and fixed on the left and right sides of the upper end of the standard square box 30 for positioning the head tube by bolts. On the side, the upper side of the supporting angle iron 36 for fuel tank mounting shaft positioning is a horizontal surface and an L-shaped connecting block 37 for fuel tank mounting shaft positioning is fixed on the rear part of the upper side by bolts, and the upper end of the fuel tank mounting shaft positioning is fixedly arranged on the connecting block 37 There is a fuel tank installation shaft positioning block 38, and the fuel tank installation shaft positioning block 38 upper surface is provided with a fuel tank installation shaft positioning groove for the two ends of the fuel tank installation shaft 10 to fall into the positioning;

The radiator support lug positioning assembly includes two radiator support lug positioning blocks 39, the lower surfaces of the two radiator support lug positioning blocks 39 are fitted respectively and fixed by bolts in front of the upper sides of the supporting angle irons used for the positioning of the two oil tank installation shafts. position, the upper rear end of the radiator lug positioning block 39 has a radiator lug positioning surface for fitting and positioning with the front lower side of the radiator lug, and the radiator lug positioning surface is provided with radiator lug positioning holes and Radiator lug positioning pin, the radiator lug positioning pin is used to pass through the lug hole on the radiator lug and the radiator lug positioning hole to realize the positioning and locking of the radiator lug 8;

The front inclined pipe and the engine front suspension shaft positioning assembly include a standard square box 40 for positioning the engine front suspension shaft as a whole in a rectangular structure. The mounting holes on the mounting platform are arranged with a number of mounting holes at the same spacing and aperture array, and the standard square box 40 for the positioning of the engine front suspension shaft is fixed on the corresponding position in the middle of the front end of the three-dimensional mounting platform 1 by bolts; the standard square box for positioning the engine front suspension shaft Case 40 both sides are respectively vertically fixedly provided with a suspension shaft positioning plate 41 by bolts, and the rear end of the suspension shaft positioning plate 41 rear end of the engine extends backward out of the standard square box for positioning the front suspension shaft of the engine and is arranged with two horizontally oppositely. The engine front suspension shaft positioning holes, the two engine front suspension shaft positioning holes are used for the two engine front suspension shafts 9 ends to penetrate to realize positioning;

The front section of the main beam tube and the positioning assembly of the connecting tube include a standard square box 42 for the positioning of the front section of the main beam tube and the connecting tube in a rectangular structure as a whole. Each side of the standard square box 42 is arranged with a number of installation holes according to the same spacing and aperture array as the installation holes on the three-dimensional installation platform. The position on the right side of the rear of the standard square box used for positioning the front suspension shaft of the engine on platform 1; the left side of the standard square box 42 for the positioning of the front section of the main beam tube and the connecting pipe The standard angler 43, the standard angler 43 for the positioning of the front section of the main beam tube and the connecting pipe includes a fixed block and a rotating block each having a hinged end and an opening and closing end, and the hinged ends of the fixed block and the rotating block can be rotatably hinged Moreover, a rotation angle positioning pin for realizing rotation angle positioning is provided at the hinge, and 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. The opening and closing ends of the fixed block of the standard angler 43 for the positioning of the front section of the beam tube and the connecting pipe are arranged downward, and the fixed block is horizontally fixed on the upper left side of the standard square box 42 for the positioning of the front section of the main beam tube and the connecting pipe by bolts , the hinged end of the fixed block and the rotating block in the standard angler 43 used for positioning the front section of the main beam tube and the connecting tube is located directly below the position where the front section 4 of the main beam tube is connected to the connecting tube 6, and the front part of the main beam tube The rotating blocks of the standard angler 43 for the positioning of sections and connecting pipes are arranged along the front-to-back direction, and the middle part of the upper surface is fixedly provided with the front section of the main beam tube and the positioning block 44 for the connecting pipe. The front section of the main beam tube and the connecting pipe are positioned The upper surface of the block 44 is provided with positioning grooves for the front section of the main beam tube and the connecting tube, and can be used to realize the sequential positioning of the front section of the main beam tube and the connecting tube.

In this way, when in use, first adjust the angle of the head tube positioning standard angler to the required angle, and then insert the head tube into the head tube positioning column so that the lower end and the head tube positioning round table abut and support and realize Positioning of the head tube: attach the rear end of the direction limit block to the installation position of the upper end of the head tube, and insert the protrusion at the rear end of the direction limit block positioning block into the two grooves abutting on the direction limit block , to realize the positioning of the limit block in the opposite direction; the upper front end of the front inclined tube is abutted against the corresponding position on the rear side of the head tube, so that the lower end of the front inclined tube falls between the two engine front suspension shaft positioning plates, and the two engine front The suspension shaft passes through the engine front suspension shaft positioning holes on the two engine front suspension shaft positioning plates and the installation hole on the front inclined pipe, so that the engine front suspension shaft and the front inclined pipe can be positioned at the same time; The inner end of the lug is attached to the corresponding installation position outside the front inclined pipe, so that the front and lower side of the outer end of the radiator lug is fitted to the radiator lug positioning surface on the radiator lug positioning block, and the radiator lug is adopted The positioning pin is inserted into the radiator lug hole and the radiator lug positioning hole to realize the positioning and locking of the radiator lug; to position the front section of the main beam tube and the connecting pipe, use the rotating block of the standard angler to rotate and adjust to the position of the main beam. The front section of the main beam tube is parallel to the position, and then the front end of the main beam tube is abutted against the corresponding installation position on the upper part of the rear side of the head tube, and the front section of the main beam tube falls into the main beam on the front section of the main beam tube and the positioning block of the connecting tube. The front section of the tube and the positioning groove of the connecting tube are used to locate the front section of the main beam tube; the front end, upper end and lower end of the connecting plate of the head tube are respectively installed correspondingly to the front section of the front tube, the front section of the main beam tube and the front inclined tube The positions are close to each other, and the fuel tank installation shaft is passed through the assembly hole on the head tube connecting plate horizontally, and the two ends of the fuel tank mounting shaft fall into the positioning groove of the fuel tank mounting shaft, so that the installation of the fuel tank shaft and the head tube connecting plate can be realized at the same time. After the positioning of the above-mentioned components is completed, the welding and fixing between the above-mentioned components can be completed at one time with a welding torch; then the front section of the main beam tube and the connecting tube are positioned with the front end of the rotating block of the standard angler downward Rotate and adjust to the parallel position with the connecting pipe, then respectively touch the two ends of the connecting pipe to the corresponding installation positions on the front inclined pipe and the main beam tube, and drop the middle of the connecting pipe into the front section of the main beam tube and the positioning block of the connecting pipe The front part of the main beam tube and the positioning groove of the connecting pipe on the upper part are used to realize the positioning of the connecting pipe; then the welding torch is used to complete the welding of the two ends of the connecting pipe; . The mutual position accuracy of each component is reliable and the welding operation is convenient and quick, which saves the cost. At the same time, due to the use of standard square boxes, supporting angle irons, standard anglers, three-dimensional installation platforms and other non-standard positioning components to achieve connection and cooperation (in specific implementation, the standard components themselves are all prior art and belong to It is a product that can be directly purchased in the market, so the specific structure is not disclosed in detail in the embodiment), so that each positioning structure can be adjusted and installed flexibly and conveniently according to the needs, making it very suitable for use when the sample trial production needs to adjust the position of the local components of each component , greatly saving R&D costs. At the same time, some of the non-standard positioning components can realize the positioning of multiple components at the same time, and the structural arrangement is ingenious and ensures the accuracy of mutual positions. In particular, the structural setting of the front section of the main beam tube and the positioning assembly of the connecting tube enables it to complete the clamping and welding of the front section of the main beam tube and the connecting tube in sequence, avoiding mutual interference, and greatly improving the overall welding efficiency of the frame .

Wherein, the positioning welding fixture structure of the middle section of the vehicle frame includes a battery lug positioning assembly, an engine rear suspension shaft positioning assembly, a flat fork shaft positioning assembly, a side cover lock lug positioning assembly, a side cover lower lug positioning assembly, Front reinforcement block positioning assembly, upper tube front section positioning assembly and air filter bracket positioning assembly;

The battery lug positioning assembly includes a standard square box 45 for battery lug positioning with a rectangular overall structure, and each side of the standard square box 45 for battery lug positioning is consistent with the mounting holes on the three-dimensional installation platform. There are several installation holes arranged in the spacing and aperture array, and the standard square box 45 for positioning the battery lugs is fixed on the three-dimensional installation platform by bolts on the position on the right side behind the standard square box for positioning the engine front suspension shaft (in specific implementation, the battery support The standard square box 45 for ear positioning and the standard square box 42 for positioning the front section of the main beam tube and the connecting pipe are the same component to better save components and simplify the fixture structure); the right side of the standard square box 45 for battery lug positioning The upper part of the surface is fixedly connected with a battery lug positioning plate 46 by bolts. The rear part of the battery lug positioning plate 46 extends backward and the upper and lower ends of the rear part extend to the corresponding positions of the two battery lug installation positions. The battery lug positioning plate The upper and lower ends of the rear part of 46 are respectively provided with a battery lug positioning hole horizontally, and a battery lug positioning pin is arranged in the battery lug positioning hole. The battery lug positioning pin is used to insert into the battery lug positioning hole and the corresponding battery. The ear hole of the lug 16 realizes the positioning of the battery lug;

The engine rear suspension shaft positioning assembly includes two overall vertically arranged engine rear suspension shaft positioning plates 47, and the front ends of the two engine rear suspension shaft positioning plates 47 are fixed on the left and right sides of the standard square box 45 lower part by bolts. Side, the rear end of the engine rear suspension shaft positioning plate 47 extends backward, and the upper and lower sides are respectively provided with engine rear suspension shaft positioning holes horizontally, and the engine rear suspension shaft positioning holes on the upper side of the rear end of the two engine rear suspension shaft positioning plates are arranged horizontally And it is used for the insertion and positioning of the two ends of the upper suspension shaft 12 after the engine, and the engine rear suspension shaft positioning holes on the lower side of the rear end of the two engine rear suspension shaft positioning plates are arranged horizontally and are used for insertion and positioning of the two ends of the rear lower suspension shaft 13 of the engine ;

The flat fork shaft positioning assembly includes two supporting angle irons 48 for the positioning of the flat fork shaft that are vertically triangular as a whole, and each side of the supporting angle irons 48 for the positioning of the flat fork shaft is consistent with the installation holes on the three-dimensional installation platform 1. There are a number of installation holes arranged in the spacing and aperture array, and the two support angle irons 48 for the positioning of the flat fork shaft are symmetrically arranged on the left and right sides behind the standard square box 45 for the positioning of the battery lugs, and are fixed on the three-dimensional installation platform 1 by bolts. On the surface, the front side of the support angle iron 48 for the positioning of the flat fork shaft is a vertical installation surface and an L-shaped flat fork shaft support transition block 49 is provided at the lower end of the front side, and the flat fork shaft supports the transition block 49. On each side of the block 49, several installation holes are arranged according to the same spacing and aperture array as the installation holes on the three-dimensional installation platform 1, and are fixed on the front side of the support angle iron 48 for the positioning of the flat fork shaft by bolts, and the flat fork shaft supports the transition The block 49 has a horizontal upper surface and the middle part of the upper surface is fixed with a flat fork shaft positioning block 50 by bolts. groove; the flat fork shaft positioning assembly also includes a flat fork shaft pressing mechanism, and the flat fork shaft pressing mechanism includes a flat fork shaft pressing pin installation rod 51 arranged horizontally above the flat fork shaft positioning block, and the flat fork shaft One end of the compression pin installation rod 51 is installed on the front side of the support angle iron 48 for the positioning of the flat fork shaft and the other end is screwed with a vertically arranged flat fork shaft compression pin 52, and the lower end of the flat fork shaft compression pin 52 is facing The positioning groove of the flat fork shaft is set and used to realize the compression of the end of the flat fork shaft 14 after positioning;

The side cover lock lug positioning assembly includes a side cover lock lug positioning block 57 which is fixed on the right side of the flat fork shaft supporting the transition block 49 in front of the front by bolts, and the upper end of the side cover lock lug positioning block 57 is formed by protruding upwards. The positioning part of the side cover lock lug, the positioning part of the side cover lock lug is provided with a side cover lock lug positioning hole in the transverse direction, and the positioning pin of the side cover lock lug is fitted in the positioning hole of the side cover lock lug, and the side cover lock support The lug positioning pin is used to insert the side cover lock lug positioning hole and the lug hole on the side cover lock lug to realize the positioning of the side cover lock lug 15;

The side cover lower lug positioning assembly includes a side cover lower lug positioning block 53 fixedly installed on the corresponding position in the middle of the inner surface of the support angle iron 48 for positioning the flat fork shaft by bolts, and the rear end of the side cover lower lug positioning block 53 is suspended. The positioning part of the lower ear of the side cover, the positioning part of the lower ear of the side cover is provided with the positioning hole of the lower ear of the side cover in the transverse direction, and the positioning pin of the lower ear of the side cover is fitted in the positioning hole of the lower ear of the side cover. The lug positioning pin is used to insert the lug hole on the lower lug of the side cover and the positioning hole of the lower lug of the side cover to realize the positioning of the lower lug 21 of the side cover;

The front reinforcement block positioning assembly includes a front reinforcement block positioning block 54 installed and fixed on the upper part of the front side of the two flat fork shaft positioning support angle irons 48 by bolts, and the front reinforcement block positioning block 54 front side has a front extending The positioning protrusion of the front reinforcement block, the positioning hole of the front reinforcement block is arranged transversely through the positioning protrusion of the front reinforcement block, and a positioning rod of the front reinforcement block is fitted in the positioning hole of the front reinforcement block transversely, and the positioning rod of the front reinforcement block is used for Realize the positioning of the front reinforcement block through the front reinforcement block positioning hole and the assembly hole on the front reinforcement block 17;

The front section positioning assembly of the upper tube includes two upper tube front section positioning blocks 55 respectively installed and fixed on the front sides of the two flat fork shaft positioning support angle irons 48 by bolts, and the upper tube front section positioning block 55 is located at At the position above the front reinforcing block positioning block 54, the upper surface of the upper tube front segment positioning block 55 is correspondingly provided with an upper tube front segment positioning groove for the upper tube front segment to fall into and position along the front and rear direction; the upper tube front segment positioning assembly It also includes a pressing mechanism for the front section of the upper tube. The pressing mechanism for the front section of the upper tube includes a support for pressing the front section of the upper tube that is vertically arranged and rotatably installed on the top of the support angle iron for positioning the flat fork shaft. Rod 56, the upper end of the support rod 56 for pressing the front section of the upper pipe is horizontally installed with a connecting rod for pressing the front section of the upper pipe. The front section pressing pin 58, the lower end of the front section pressing pin 58 of the upper pipe is set against the positioning groove of the front section of the upper pipe and is used to realize the pressing of the front section 18 of the upper pipe after positioning;

The air filter bracket positioning assembly includes an air filter bracket positioning plate 59, the two ends of the air filter bracket positioning plate 59 are detachably fixed to the flat fork shaft positioning above the two front section positioning blocks 55 of the upper pipe by bolts. On the front side of the supporting angle iron 48, the rear side of the air filter bracket positioning plate 59 is used to connect with the front side of the air filter bracket 19 to limit the position.

In this way, the positioning plate of the air filter bracket is disassembled before use, and the engine suspension mounting bracket is first placed in its installation position, and then the engine rear upper suspension shaft and the engine rear lower suspension shaft are respectively inserted transversely into the corresponding engine rear suspension shaft positioning holes and the mounting hole on the engine suspension mounting bracket, then insert the flat fork shaft into the mounting hole on the engine suspension mounting The positioning of the suspension shaft, the rear suspension shaft of the engine, and the flat fork shaft relies on the three positioning points of the triangle formed by the three components to realize the positioning of the engine suspension mounting bracket, and then rotate and adjust the flat fork shaft pressing pin to make it The lower end is downward to realize the compression and fixation of the flat fork shaft, and at the same time realize the fixation of the engine suspension mounting frame by its constraints; attach the mounting end of the side cover lock lug to the middle installation position on the right side of the engine suspension mounting frame, and The positioning pin of the side cover lock lug passes through the positioning hole of the side cover lock lug and the lug hole on the side cover lock lug to realize the positioning of the side cover lock lug; insert the lower end of the main beam tube into the engine suspension mounting bracket and Connect it to its installation position. When the engine suspension mounting frame is fixed, the positioning of the lower section of the main beam tube will be realized at the same time; the welding ends of the two battery lugs will be attached to the corresponding installation positions on the main beam tube, and the positioning pin of the battery lug will be fixed. Insert the positioning hole of the battery lug and the lug hole corresponding to the battery lug to realize the positioning of the battery lug; insert the front lower end of the down tube into the through hole on the engine suspension mounting bracket and make its end abut against the flat fork shaft to realize Positioning of the lower end of the lower tube; after the upper end of the lower tube is positioned by other positioning structures, fit the welding end of the lower lug of the side cover to the corresponding installation position on the lower tube, and place the positioning pin of the lower lug of the side cover Insert the positioning hole of the lower lug of the side cover and the lug hole on the lower lug of the side cover to realize the positioning of the lower lug of the side cover; fit the front end of the upper tube to the corresponding installation position on the main beam tube, so that the front section of the upper tube falls into the Go to the upper tube front section positioning groove on the upper tube front section positioning block to realize positioning, and then rotate and adjust the upper tube front section pressing pin so that the lower end is downward to realize pressing and fixing the upper tube front section; Attach the front end of the front reinforcement block to the installation position between the main beam tube and the upper tube, and pass the positioning rod of the front reinforcement block through the positioning hole of the front reinforcement block and the assembly hole on the front reinforcement block to realize the positioning of the front reinforcement block; After the positioning of the above-mentioned components, a welding torch can be used to complete the welding and fixing between the above-mentioned positioned components at one time; The support rod makes the pressing pin of the front section of the upper pipe rotate to the outer position of the support angle iron for positioning the flat fork shaft to avoid interference; then install the positioning plate of the air filter bracket, and install the air filter bracket between the two upper pipes Position, and make the front side of the air filter bracket and the rear side of the positioning plate of the air filter bracket meet and position, complete the welding between the air filter bracket and the upper pipe; complete the welding and fixing process of the middle section of the frame for the Knight car sample. The mutual position accuracy of each component is reliable and the welding operation is convenient and quick, which saves the cost. At the same time, due to the use of standard square boxes, supporting angle irons, pressing mechanisms, three-dimensional installation platforms and other non-standard positioning components to achieve connection and cooperation, each positioning structure can be flexibly and conveniently adjusted and installed according to needs, making it very It is suitable for use when trial production of samples needs to adjust the position of local components of each component, which greatly saves the cost of research and development. At the same time, some of the non-standard positioning components can realize the positioning of multiple components at the same time, and the structural arrangement is ingenious and ensures the accuracy of mutual positions. In particular, the rotatable setting of the pressing mechanism at the front section of the upper pipe and the detachable setting of the positioning plate of the air filter bracket enable the positioning welding of the front section of the upper pipe and the air filter bracket to be completed in sequence, avoiding mutual interference, and greatly The overall welding efficiency of the frame is improved.

Wherein, the frame rear section positioning welding fixture structure includes the rear section positioning assembly of the lower tube, the electrical device lug positioning assembly, the side cover rear lug and the rear reinforcement plate positioning assembly, the upper tube tail section positioning assembly, and the seat cushion Lock bracket positioning component, seat cushion rear bracket positioning component and tail cover bracket positioning component;

The positioning assembly for the rear section of the lower tube includes two standard square boxes 60 for the positioning of the rear section components of the vehicle frame in an overall rectangular structure. The installation holes on the installation platform 1 are arranged with a number of installation holes at the same spacing and aperture array, and the standard square boxes 60 used for the positioning of the rear section components of the two vehicle frames are respectively fixed on the left and right sides of the upper rear part of the three-dimensional installation platform 1 by bolts. The positioning assembly for the rear section of the lower tube also includes two supporting angle irons 61 for positioning the rear section of the lower tube in a triangular structure as a whole. There are a number of mounting holes arranged in an array with the same spacing and hole diameter, and the two supporting angle irons 61 for the positioning of the rear section of the lower tube are fixed by bolts to the middle of the front side of the standard square box 60 for positioning the rear section of the corresponding frame. The upper surface of the supporting angle iron 61 for the positioning of the rear section of the lower tube is a horizontal plane, and the positioning block 62 for the rear section of the lower tube is fixed on the inner surface of the front part of the supporting angle iron 61 for the positioning of the rear section of the lower tube. The positioning block 62 of the rear section of the tube is obliquely provided with a positioning groove for the rear section of the down tube and is used for positioning the rear section of the down tube;

The electrical device lug positioning assembly includes an electrical device lug positioning block 63, the electrical device lug positioning block 63 is horizontally arranged and the outer end is fixed by bolts and is arranged on the left side of the lower tube rear section positioning support angle iron 61. At the corresponding position on the front end of the horizontal upper surface, the inner end of the electrical device lug positioning block 63 is provided with an electrical device lug positioning hole and a matching electrical device lug positioning pin for realizing the positioning of the electrical device lug 23;

The side cover rear lug and rear reinforcement plate positioning assembly includes a vertically arranged side cover rear lug and a rear reinforcement plate positioning block 64, and the lower part of the side cover rear lug and the rear reinforcement plate positioning block 64 is fixed on the corresponding The inner surface of the supporting angle iron 61 for the positioning of the rear section of the lower tube, the front end of the side cover rear lug and the rear reinforcement plate positioning block 64 has a side cover rear lug positioning part extending upward, and the side cover rear lug positioning part is horizontally The side cover rear lug positioning hole is provided through and matched with the side cover rear lug positioning pin. The side cover rear lug positioning pin is used to insert into the lug hole on the side cover rear lug to realize the positioning of the side cover rear lug 24 , the rear lugs of the side cover and the rear reinforcing plate positioning block 64 have a rear reinforcing plate positioning portion extending upwards and backwards. The positioning hole of the reinforcing plate is equipped with a positioning pin of the rear reinforcing plate and is used for correspondingly inserting into the assembly hole on the rear reinforcing plate to realize the positioning of the rear reinforcing plate 26;

The seat cushion lock bracket positioning assembly includes a vertical seat cushion lock bracket positioning plate 65, and the lower end of the seat cushion lock bracket positioning plate 65 is fixed on the inner side of the standard square box 60 for positioning the rear section of the vehicle frame by bolts. In the upper part, the upper end of the seat cushion lock bracket positioning plate 65 extends obliquely forward and upward to the front side of the standard square box 60 for positioning the rear section of the vehicle frame and is provided with two seat cushion lock bracket positioning holes at the end. The seat cushion lock support positioning pin is matched with the seat cushion lock support positioning hole on the lock support bracket and is used to pass through the installation hole on the seat cushion lock support to realize the positioning of the seat cushion lock support 27;

The positioning assembly for the tail section of the upper tube includes a standard square box 66 for positioning the tail section of the upper tube with a rectangular structure as a whole. The standard square boxes 66 for positioning the tail section of the upper tube are all in accordance with the installation holes on the three-dimensional installation platform. A number of installation holes are arranged in a consistent spacing and aperture array. The standard square box 66 for the positioning of the tail section of the upper pipe is a horizontal long rectangular body, and the two ends are fixed horizontally by bolts and installed in the standard square box for the positioning of the rear section of the frame. 60, on the inner surface of the top, a standard square box 66 for the positioning of the upper tube tail section is fixed with an upper tube tail section positioning block 67 at the two ends of the upper surface. The tail section of the pipe falls into the positioning groove of the tail section of the upper pipe; the positioning assembly for the tail section of the upper pipe also includes a pressing mechanism for the tail section of the upper pipe, and the pressing mechanism for the tail section of the upper pipe includes a vertically arranged and rotatably mounted The support rod 68 for pressing the upper pipe tail section on the upper surface of the standard square box for the positioning of the rear section of the vehicle frame, and the upper end of the upper end of the upper pipe tail section for pressing the support rod 68 is horizontally equipped with a connecting rod for pressing the upper pipe tail section. One end of the connecting rod for pressing the tail section of the pipe is screwed and fitted with a pressing pin 69 for the tail section of the upper pipe. Compression of the pipe tail section 25;

The seat cushion rear bracket positioning assembly includes a vertically arranged seat cushion rear bracket positioning block 70, the lower end of the seat cushion rear bracket positioning block 70 is fixed on the front side of the middle part of the standard square box 66 for positioning the tail section of the upper tube, and the seat cushion The upper end of the rear support positioning block 70 is correspondingly provided with a seat cushion rear support positioning boss, and the seat cushion rear support positioning boss is used to insert upward into the positioning hole on the seat cushion rear support 28 top surface to realize the positioning of the seat cushion rear support 28 ;

The tail cap bracket positioning assembly includes two tail cap bracket positioning columns 71 correspondingly vertically arranged on the left and right sides behind the upper surface of the standard square box 66 for positioning the tail section of the upper tube, and the tail cap bracket positioning columns 71 are formed with a tail cap The bracket positioning boss is also used to correspondingly insert into the positioning hole on the lower bottom surface of the tail cap bracket to realize the positioning of the tail cap bracket 29 .

In this way, first place the tail cap bracket according to the installation position and make the two positioning holes on it fall into the tail cap bracket positioning bosses on the upper ends of the two tail cap bracket positioning posts respectively to realize the positioning of the tail cap bracket; When in use, drop the tail section of the upper tube into the positioning groove of the tail section of the upper tube to realize positioning, and then rotate and adjust the pressing pin of the tail section of the upper tube so that its lower end is downward to press and fix the tail section of the upper tube; put the rear upper end of the lower tube Butt against the corresponding installation position on the lower surface of the upper tube and make the rear section of the lower tube fall into the positioning groove of the rear section of the lower tube to achieve positioning; attach the mounting end of the electrical device lug to the upper installation position of the lower tube, and rely on the electrical device support Insert the lug positioning pin into the positioning hole of the electrical component lug and the lug hole of the electrical component lug to realize the positioning of the electrical component lug; attach the upper end of the rear lug of the side cover to the installation position on the upper tube, and lean against the rear support of the side cover Insert the lug positioning pin into the positioning hole of the rear lug of the side cover and the lug hole on the rear lug of the side cover to realize the positioning of the rear lug of the side cover; attach the upper side of the rear reinforcement plate to the rear lower side of the lower tube and the rear lower side of the upper tube The installation position between the sides, and the positioning of the rear reinforcement plate is realized by inserting the two positioning pins of the rear reinforcement plate into the corresponding positioning holes of the rear reinforcement plate and the assembly holes on the rear reinforcement plate; attach the mounting end of the seat cushion lock bracket to the To the rear installation position on the outer side of the rear reinforcement plate, the positioning pin of the seat cushion lock bracket passes through the positioning hole of the seat cushion lock bracket and the installation hole on the seat cushion lock bracket to realize the positioning of the seat cushion lock bracket; in this way, the positioning of the above-mentioned components is completed After positioning, a welding torch can be used to complete the welding and fixing of the above-mentioned positioned components at one time; then rotate and adjust to loosen the pressing pin of the tail section of the upper tube, and then rotate the support rod for pressing the tail section of the upper tube to make the tail of the upper tube The section pressing pin is screwed to the outside position of the standard square box used for positioning the rear section of the frame to avoid interference; then the seat cushion rear bracket is placed in its installation position so that both sides of the seat cushion rear bracket fall on the rear section of the upper tube surface, and make the positioning hole on the top surface of the rear bracket of the seat cushion fall into the positioning boss of the rear bracket of the seat cushion to realize the positioning of the rear bracket of the seat cushion, and complete the welding between the rear bracket of the seat cushion and the upper tube; The sample is processed by welding and fixing the components of the rear section of the frame. The mutual position accuracy of each component is reliable and the welding operation is convenient and quick, which saves the cost. At the same time, due to the use of standard square boxes, supporting angle irons, pressing mechanisms, three-dimensional installation platforms and other non-standard positioning components to achieve connection and cooperation, each positioning structure can be flexibly and conveniently adjusted and installed according to needs, making it very It is suitable for use when trial production of samples needs to adjust the position of local components of each component, which greatly saves the cost of research and development. At the same time, some of the non-standard positioning components can realize the positioning of multiple components at the same time, and the structural arrangement is ingenious and ensures the accuracy of mutual positions. In particular, the rotatable setting of the pressing mechanism at the tail section of the upper tube enables the positioning welding of the tail of the upper tube and the rear bracket of the seat cushion to be completed in sequence, avoiding mutual interference, and greatly improving the overall welding efficiency of the frame.

To sum up, the above-mentioned fixture can simplify the welding and assembly process, has the advantages of simple operation, low cost, and can facilitate the trial production and adjustment of the rider bike sample.

Claims (6)

1. A method for processing the structure of the front section of the rider's car sample frame is characterized in that, first adopt welding fixtures to complete the front section of the front tube, the front inclined tube, the main beam tube, the front tube connecting plate, the direction limit block, The positioning of the radiator lugs, the two front suspension shafts of the engine and the installation shaft of the fuel tank, and the welding and fixing of the above-mentioned components are completed at one time with a welding torch. and the rear end of the component is located directly below the junction of the main beam tube and the connecting tube, and can be rotated and adjusted. After the above-mentioned welding is completed, the component is rotated and adjusted to be parallel to the connecting tube, and the front part of the main beam tube is realized by using this component. The segment positioning structure is used to realize the positioning of the connecting pipe, and then realize the welding and fixing of the connecting pipe; The welding fixture includes a three-dimensional installation platform with several installation holes arranged in a fixed-space array on the upper surface and the peripheral side surface, and also includes a head tube positioning component for realizing the positioning of the head tube, and a direction for realizing the positioning of the direction limit block. Limiting block positioning assembly, head pipe connection plate and fuel tank installation shaft positioning assembly for positioning the head pipe connection plate and fuel tank installation shaft, radiator lug positioning assembly for radiator lug positioning, for realizing front The inclined tube and the front inclined tube for positioning the front suspension shaft of the engine and the positioning assembly for the front suspension shaft of the engine, the front section of the main beam tube and the positioning assembly for the connecting tube respectively used to realize the sequential positioning of the front section of the main beam tube and the connecting pipe; The front inclined pipe and the engine front suspension shaft positioning assembly include a standard square box for engine front suspension shaft positioning with a rectangular structure as a whole. There are a number of mounting holes arranged in an array of consistent spacing and apertures on the mounting holes. The standard square box used for positioning the engine front suspension shaft is fixed to the corresponding position in the middle of the front end of the three-dimensional installation platform by bolts; An engine front suspension shaft positioning plate is vertically fixed by bolts, and the rear end of the engine front suspension shaft positioning plate extends backward out of the standard square box for engine front suspension shaft positioning, and two engine front suspension shaft positioning holes are arranged transversely opposite to each other. The positioning holes of the two front suspension shafts of the engine are used for the ends of the two front suspension shafts of the engine to penetrate to realize positioning. 2. The method for processing the structure of the front section of the frame of the knight car sample as claimed in claim 1, wherein the head tube positioning assembly comprises a standard square box for the positioning of the head tube in a rectangular structure as a whole, and the A number of installation holes are arranged on each side of the standard square box for head tube positioning according to the same spacing and aperture array as the installation holes on the three-dimensional installation platform. The standard square box for head tube positioning is fixed on the middle of the front side of the three-dimensional installation platform by bolts position; the upper end of the standard square box for the positioning of the head tube is fixedly provided with a standard angler for the positioning of the head tube, and the standard angler for the positioning of the head tube 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 are provided with a rotating angle positioning pin for realizing the positioning of the rotating angle at the hinge. The aperture array is arranged with a number of installation holes, the opening and closing end of the fixed block of the standard angler for head tube positioning is arranged forward and fixed horizontally on the upper end of the standard square box for head tube positioning by bolts, the standard angler for head tube positioning The middle part of the upper surface of the rotating block is fixed upward with a head tube positioning round table, the diameter of the head tube positioning round table matches the outer diameter of the lower end of the head tube, and the head tube positioning round table axis is coaxially provided with a head tube matching the inside diameter of the head tube positioning post. 3. The method for processing the structure of the front section of the frame of the rider bike sample according to claim 2, wherein the positioning assembly of the direction limiting block includes a support angle for the positioning of the direction limiting block in an L-shaped structure as a whole. Iron, on each side of the supporting angle iron for the positioning of the direction limiting block, a number of mounting holes are arranged according to the same spacing and aperture array as the mounting holes on the three-dimensional installation platform, and the lower surface of the supporting angle iron for the positioning of the direction limiting block Fitted and fixed by bolts on the upper surface of the rotating block of the standard angler used for the positioning of the head tube, the upper part of the rear side of the supporting angle iron used for the positioning of the direction limiting block is fixedly provided with a direction limiting block positioning block, the direction limiting block positioning block One end is fixed on the upper part of the rear side of the supporting angle iron used for positioning the head tube accessories, and the other end extends backward and downward and has a protrusion at the end for inserting into the two grooves on the direction limit block to realize the positioning of the direction limit block. rise. 4. The method for processing the structure of the front section of the rider bike sample frame according to claim 2, wherein the head tube connecting plate and the fuel tank installation shaft positioning assembly include two fuel tank installation shafts in an L-shaped structure as a whole Supporting angle irons for positioning, and several mounting holes are arranged on each side of the supporting angle irons for positioning the fuel tank installation shafts according to the same spacing and aperture array as the mounting holes on the three-dimensional installation platform, and the two fuel tank installation shafts are used for positioning. The side surfaces of the angle irons are attached respectively and fixed by bolts on the left and right sides of the upper end of the standard square box for the positioning of the head tube. The oil tank installation shaft positioning connection block, the upper end of the oil tank installation shaft positioning connection block is fixed with the fuel tank installation shaft positioning block, and the oil tank installation shaft positioning block is provided with a fuel tank installation shaft positioning for the two ends of the fuel tank installation shaft to fall into the positioning groove. 5. The method for processing the structure of the front section of the frame of the knight car sample according to claim 4, wherein the radiator lug positioning assembly includes two radiator lug positioning blocks, two radiator lug positioning blocks, and two radiator lug positioning blocks. The lower surface of the positioning block is attached respectively and fixed by bolts on the upper side of the two supporting angle irons used for the positioning of the fuel tank installation shaft. The radiator lug positioning surface is provided with radiator lug positioning holes and radiator lug positioning pins, and the radiator lug positioning pins are used to pass through the lug holes on the radiator lugs and the positioning hole of the radiator lug to realize the positioning and locking of the radiator lug. 6. The method for processing the structure of the front section of the frame of the rider bike sample according to claim 2, wherein the front section of the main beam tube and the positioning assembly of the connecting tube comprise a main beam tube with a rectangular body structure as a whole The standard square box for the positioning of the front section and the connecting pipe, on each side of the standard square box for the positioning of the front section of the main beam tube and the connecting pipe, several The installation hole, the standard square box used for the positioning of the front section of the main beam tube and the connecting pipe are fixed on the three-dimensional installation platform by bolts on the right side behind the standard square box used for positioning the front suspension shaft of the engine; the front section of the main beam tube and the connecting pipe are used for positioning The left side of the standard square box is fixedly provided with a standard angler for positioning the front section of the main beam tube and the connecting pipe. The fixed block and the rotating block at the joint end, the hinged 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 installed according to the three-dimensional installation platform There are a number of mounting holes arranged in an array of consistent spacing and apertures on the mounting holes. The opening and closing ends of the fixing block of the standard angler for the positioning of the front section of the main beam tube and the connecting pipe are arranged downward, and the fixing block is horizontally fixed on the main beam by bolts. The upper part of the left side of the standard square box used for the positioning of the front section of the beam tube and the connecting pipe, the hinged ends of the fixed block and the rotating block in the standard angler for the positioning of the front section of the main beam tube and the connecting pipe are located at the front section of the main beam tube Directly below the position connected to the connecting pipe, the front section of the main beam tube and the rotating block of the standard angler used for positioning the connecting pipe are arranged along the front and rear directions, and the front section of the main beam tube and the positioning block of the connecting pipe are fixed upward in the middle of the upper surface. The upper surface of the front section of the main beam tube and the positioning block of the connecting tube is provided with positioning grooves for the front section of the main beam tube and the connecting tube, and can be used to realize the sequential positioning of the front section of the main beam tube and the connecting tube.