Electric motorcycle frame and preparation method thereof

Abstract

The invention discloses an electric motorcycle frame and a preparation method thereof in the field of electric motorcycles, the electric motorcycle frame comprises a first frame plate and a second frame plate, the first frame plate and the second frame plate are of a symmetrical structure, and the top of the first frame plate and the top of the second frame plate are integrally and fixedly connected with a top reinforcing plate; a top sealing plate is arranged on the first frame plate and the second frame plate and located above the top reinforcing plate, and edge buckle plates are integrally formed at the positions, located on the two sides of the first frame plate and the two sides of the second frame plate, of the top sealing plate and the top sealing plate. The middle anti-deformation supporting columns used for reinforcing are arranged between the first vehicle frame plate and the second vehicle frame plate, during assembling, the width of the two vehicle frame plates can be positioned, the assembling efficiency is improved, meanwhile, the reinforcing effect can be achieved, the supporting rigidity of the vehicle frame is ensured, and during wiring, the supporting rigidity of the vehicle frame can be ensured. And the excessive length of wire is wound on the middle anti-deformation supporting column, so that the wire is collected and neatened, the wire is prevented from being overlapped on the battery, and the safety coefficient is improved.

Description

Technical Field

[0001] The invention relates to the field of electric motorcycles, in particular to an electric motorcycle frame and a preparation method thereof. Background Art

[0002] With the vigorous development of new energy technologies, the market share of electric motorcycles continues to expand. In the production process of electric motorcycles, the frame is a key component, and its quality is directly related to the performance and safety of the whole vehicle. However, there are many problems with existing motorcycle frames. For example, in the assembly process, due to the lack of effective positioning support in the center, the size of the hollow cavity is difficult to accurately control, which reduces the assembly efficiency; such as the detachable electric motorcycle frame with application number CN202320317153.3, its overall thickness is consistent, and its single component structure is relatively complex, which requires casting or machining to be made, with high cost and low efficiency, and the overall rigidity is greatly affected by the thickness of the plate, lacking the necessary reinforcement measures, resulting in poor overall rigidity; some frame components must rely on machining, which not only increases the difficulty of processing, but also reduces the processing efficiency. Taking the common electric motorcycle frame as an example, during assembly, due to inaccurate positioning, the single-piece assembly time is as long as 30 minutes, and when subjected to a vertical load of 2000N, the deformation is as high as 4mm, which seriously affects the quality and performance of the frame.

[0003] Therefore, those skilled in the art provide an electric motorcycle frame and a preparation method thereof to solve the problems raised in the above background technology. Summary of the invention

[0004] The object of the present invention is to provide an electric motorcycle frame and a preparation method thereof to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention provides an electric motorcycle frame, comprising a symmetrically arranged frame plate 1 and a frame plate 2, the tops of the frame plates 1 and 2 are integrally fixedly connected with a top reinforcing plate, the frame plates 1 and 2 are provided with a top sealing plate located above the top reinforcing plate, the top sealing plate, the top sealing plate is integrally formed with edge buckle plates at both sides of the frame plates 1 and 2, one side of the edge buckle plate is integrally formed with a folding edge, the folding edge is buckled above the frame plates 1 and 2, the top sealing plate is connected to the top reinforcing plate by a hinge, and the ends of the frame plates 1 and 2 are welded with end sealing plates;

[0007] A middle anti-deformation support column for reinforcement is arranged between the frame plate 1 and the frame plate 2, and the middle anti-deformation support column is connected to the frame plate 1 and the frame plate 2 through anti-screw screws.

[0008] Further, a bottom sealing plate one is integrally and fixedly connected to the bottoms of the frame plate one and the frame plate two. Another bottom sealing plate two is fixedly connected to the other side of the bottoms of the frame plate one and the frame plate two. An arc-shaped groove one is formed at one end of the bottom sealing plate one. A wire-passing round hole is formed in the bottom sealing plate one on one side of the arc-shaped groove one. A heat dissipation mesh hole is formed in the bottom sealing plate one on one side of the wire-passing round hole.

[0009] Further, a plurality of heat dissipation long holes are formed in the bottom sealing plate two. An installation fixing plate fixedly connected to the frame plate one and the frame plate two is arranged below the bottom sealing plate two. Fixing long holes are formed in the installation fixing plate.

[0010] Further, the heat dissipation mesh holes are arranged in an array, and the aperture is 5 - 8 mm. The width of the heat dissipation long holes is 3 - 5 mm, and the length is 15 - 25 mm.

[0011] Further, a wire-passing sealing plate is fixedly connected between the frame plate one and the frame plate two below the end sealing plate. A wire-passing long hole is formed in the wire-passing sealing plate.

[0012] Further, a reinforcing convex plate one and a reinforcing convex plate two are arranged on the side walls of the frame plate one and the frame plate two away from each other. The reinforcing convex plate one and the reinforcing convex plate two are connected to the frame plate one and the frame plate two through internal screws.

[0013] Further, the thickness of the reinforcing convex plate one and the reinforcing convex plate two is 1.2 - 1.5 times the thickness of the frame plate one and the frame plate two, and they are fixed by countersunk head screws.

[0014] Further, an arc-shaped groove two is formed on one side of the top reinforcing plate. The arc-shaped groove one and the arc-shaped groove two are used for fixing and welding the front fork tube.

[0015] The present invention also provides a preparation method for an electric motorcycle frame, including the following steps:

[0016] S101. Blanking: Cut and blank according to the unfolded dimensions of the frame plate one, the frame plate two, the top sealing plate, the bottom sealing plate one, the bottom sealing plate two, the installation fixing plate, the wire-passing sealing plate, the top reinforcing plate, and the end sealing plate;

[0017] S102. Bending and punching: Perform bending and punching operations on the top sealing plate and the bottom sealing plate two, and perform punching operations on the bottom sealing plate one, the top reinforcing plate, and the wire-passing sealing plate to punch out corresponding vacancies;

[0018] S103. Assembly: First, fix the reinforcement convex plate 1 and the reinforcement convex plate 2 on the frame plate 1 and the frame plate 2 with anti-loosening screws. Then, install the middle anti-deformation support column between the frame plate 1 and the frame plate 2 through screws to position the distance between the frame plate 1 and the frame plate 2. Then, weld the top reinforcement plate, the bottom sealing plate 1, the bottom sealing plate 2 and the wire-passing sealing plate. Then, weld and fix the installation fixing plate and the end sealing plate, and weld the front fork tube on the arc groove 1 and the arc groove 2;

[0019] S104. Fix the top sealing plate and the top reinforcement plate with a hinge. The top sealing plate can be opened and closed along the hinge, which is convenient for completing the installation and wiring arrangement of the battery.

[0020] Further, in step S102, the punching process uses a CNC punching machine, and the punching accuracy is controlled within ±0.1 mm. In step S103, the installation of the middle anti-deformation support column 12 is assisted by a positioning fixture to ensure the symmetry and distance accuracy of the frame plate 1 and the frame plate 2. The welding uses a robotic welding, and the welding parameters are current 180 - 220 A, voltage 20 - 24 V, and welding speed 5 - 8 mm / s.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. By setting the middle anti-deformation support column for reinforcement between the frame plate 1 and the frame plate 2, the present invention can position the width of the two frame plates during assembly, improve the assembly efficiency, and also play a role in reinforcement to ensure the support rigidity of the frame. Moreover, when wiring, the excess length of the wire can be wound around the middle anti-deformation support column to achieve wire collection and avoid it from being placed on the battery, thus improving the safety factor;

[0023] 2. By setting the fixed convex plate 1 and the fixed convex plate 2, on the one hand, it can play a decorative role, and on the other hand, it can thicken and reinforce the frame plate 1 and the frame plate 2 to improve the overall strength of the frame;

[0024] 3. The whole frame of the present invention is batch cut in steps and then formed by bending, punching and welding, which can simplify the operation time and process of each step, and thus facilitate the realization of cutting and assembly through automated processing. The process steps are simple and can greatly improve the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is the structural schematic diagram of the present invention;

[0026] Figure 2 is the bottom view structural diagram of the present invention;

[0027] Figure 3 is the explosion of the present inventionFigure 1 ;

[0028] Figure 4 is the explosion of the present invention Figure 2 。

[0029] In the figure: 1, the first frame plate; 2, the second frame plate; 3, the top sealing plate; 301, the edge buckling plate; 302, the flanging; 4, the end sealing plate; 5, the first bottom sealing plate; 501, the heat dissipation mesh holes; 502, the wire passing round holes; 503, the first arc-shaped groove; 6, the second bottom sealing plate; 601, the heat dissipation long holes; 7, the mounting fixing plate; 701, the fixing long holes; 8, the top reinforcing plate; 801, the second arc-shaped groove; 9, the wire passing sealing plate; 901, the wire passing long holes; 10, the first reinforcing convex plate; 11, the second reinforcing convex plate; 12, the middle anti-deformation support column. Specific embodiments

[0030] Please refer to Figures 1 - 4 , the electric motorcycle frame includes symmetrically arranged the first frame plate 1 and the second frame plate 2. The top of the first frame plate 1 and the second frame plate 2 is integrally and fixedly connected with a top reinforcing plate 8. A top sealing plate 3 is arranged above the top reinforcing plate 8 on the first frame plate 1 and the second frame plate 2. At both sides of the top sealing plate 3 located on the first frame plate 1 and the second frame plate 2, an edge buckling plate 301 is integrally formed. One side of the edge buckling plate 301 is integrally formed with a flanging 302. The flanging 302 is buckled above the first frame plate 1 and the second frame plate 2. And the top sealing plate 3 is connected with the top reinforcing plate 8 through a hinge. The ends of the first frame plate 1 and the second frame plate 2 are welded with an end sealing plate 4. The top sealing plate 3 can rotate along the hinge to realize the opening and closing of the top, which is convenient for battery replacement and maintenance operations;

[0031] A middle anti-deformation support column 12 for reinforcement is arranged between the first frame plate 1 and the second frame plate 2. The middle anti-deformation support column 12 is connected with both the first frame plate 1 and the second frame plate 2 through anti-loosening screws.

[0032] By adopting the above technical solution, by arranging the middle anti-deformation support column 12 for reinforcement between the first frame plate 1 and the second frame plate 2, during assembly, the width of the two frame plates can be positioned, the assembly efficiency can be improved, and at the same time, it can also play a role in reinforcement to ensure the support rigidity of the frame. Moreover, when wiring, the extra-length wires can be wound around the middle anti-deformation support column 12 to realize the wire arrangement, avoid the wires from being placed on the battery, and improve the safety factor.

[0033] Among them, a bottom sealing plate one 5 is integrally and fixedly connected to the bottoms of a frame plate one 1 and a frame plate two 2. On the other side of the bottoms of the frame plate one 1 and the frame plate two 2, a bottom sealing plate two 6 is fixedly connected. An arc-shaped groove one 503 is formed at the end of the bottom sealing plate one 5. A wire-passing round hole 502 is formed in the bottom sealing plate one 5 on one side of the arc-shaped groove one 503. A heat dissipation mesh hole 501 is formed in the bottom sealing plate one 5 on one side of the wire-passing round hole 502. A heat dissipation fan can be installed in the heat dissipation mesh hole 501, and heat is discharged from the heat dissipation mesh hole 501 through the heat dissipation fan to realize heat dissipation of the internal battery.

[0034] Among them, a plurality of heat dissipation long holes 601 are formed in the bottom sealing plate two 6. An installation fixing plate 7 fixedly connected to the frame plate one 1 and the frame plate two 2 is arranged below the bottom sealing plate two 6. A fixing long hole 701 is formed in the installation fixing plate 7. The frame can be fixedly installed through the fixing long hole 701. The heat dissipation mesh holes 501 are arranged in an array, and the aperture is 5-8 mm. The width of the heat dissipation long holes 601 is 3-5 mm, and the length is 15-25 mm.

[0035] Among them, a wire-passing sealing plate 9 is fixedly connected between the frame plate one 1 and the frame plate two 2 below the end sealing plate 4. A wire-passing long hole 901 is formed in the wire-passing sealing plate 9, and the wire-passing long hole 901 facilitates the passing of the power supply wiring.

[0036] Among them, a reinforcing convex plate one 10 and a reinforcing convex plate two 11 are arranged on the side walls of the frame plate one 1 and the frame plate two 2 away from each other. The reinforcing convex plate one 10 and the reinforcing convex plate two 11 are connected to the frame plate one 1 and the frame plate two 2 through internal screws. The thickness of the reinforcing convex plate one 10 and the reinforcing convex plate two 11 is 1.2-1.5 times the thickness of the frame plate one 1 and the frame plate two 2, and they are fixed by countersunk head screws.

[0037] By adopting the above technical scheme, by arranging the fixing convex plate one and the fixing convex plate two, on the one hand, it can play a decorative role, and on the other hand, it can thicken and reinforce the frame plate one 1 and the frame plate two 2 to improve the overall strength of the frame.

[0038] Among them, an arc-shaped groove two 801 is formed on one side of the top reinforcing plate 8. The arc-shaped groove one 503 and the arc-shaped groove two 801 are used for fixedly welding the front fork tube.

[0039] A preparation method of an electric motorcycle frame includes the following steps:

[0040] S101. Blanking: Cut and blank according to the unfolded dimensions of the frame plate one 1, the frame plate two 2, the top sealing plate 3, the bottom sealing plate one 5, the bottom sealing plate two 6, the installation fixing plate 7, the wire-passing sealing plate 9, the top reinforcing plate 8 and the end sealing plate 4;

[0041] S102, Bending and Punching: Perform bending and punching operations on the top sealing plate 3 and the bottom sealing plate two 6, and perform punching operations on the bottom sealing plate one 5, the top reinforcement plate 8, and the wire-passing sealing plate 9 to punch out corresponding vacant positions;

[0042] S103, Assembly: First, fix the reinforcement convex plate one 10 and the reinforcement convex plate two 11 on the frame plate one 1 and the frame plate two 2 through anti-loosening screws, then install the middle anti-deformation support column 12 between the frame plate one 1 and the frame plate two 2 through screws to position the distance between the frame plate one 1 and the frame plate two 2. Then, weld the top reinforcement plate 8, the bottom sealing plate one 5, the bottom sealing plate two 6, and the wire-passing sealing plate 9. Then, weld and fix the installation fixing plate 7 and the end sealing plate 4, and weld the front fork tube on the arc groove one 503 and the arc groove two 801;

[0043] S104, Fix the top sealing plate 3 and the top reinforcement plate 8 through a hinge, and the top sealing plate 3 can be opened and closed along the hinge, which is convenient for completing the installation and wiring arrangement operations of the battery.

[0044] Among them, in the step S102, the punching process uses a numerical control punching machine, and the punching accuracy is controlled within ±0.1 mm. In the step S103, the installation of the middle anti-deformation support column 12 uses a positioning fixture for assistance to ensure the symmetry and distance accuracy of the frame plate one 1 and the frame plate two 2. The welding uses a robot welding, and the welding parameters are a current of 180 - 220 A, a voltage of 20 - 24 V, and a welding speed of 5 - 8 mm / s.

[0045] By adopting the above technical solution, the whole frame is batch cut in steps and then formed by bending, punching, and welding, which can simplify the operation time and process of each step, and thus facilitate the realization of blanking and assembly through automated processing. The process steps are simple, which can greatly improve the production efficiency. The preparation method of step-by-step blanking, bending and punching, and welding assembly has simple process steps and is convenient for realizing automated processing.

[0046] The frame of the present invention (embodiment) is compared and tested with a conventional integral frame (comparative example):

[0047] I. Frame Rigidity Test

[0048] 1. Test Standard Specifications

[0049] 1.1 Test Basis Standards:

[0050] GB / T 24170-2009 Determination of Forming Limit Curves for Thin Metal Sheets and Strips; ISO 4136:2012 Road Vehicle Frame Static Strength Test Methods; JISD 0105 Motorcycle Frame Rigidity Test Methods.

[0051] 1.2 Test Equipment:

[0052] INSTRON 5985 Universal Material Testing Machine (accuracy class 0.5); Laser displacement sensor (accuracy ±0.01 mm); Digital strain acquisition system (sampling frequency 1 kHz);

[0053] 1.3 Test environment:

[0054] Temperature: 23 ± 2°C; Humidity: 50 ± 5% RH; Vibration isolation: Conforms to ISO 1940-1 G2.5 balance class.

[0055] 1.4 Requirements for test specimens:

[0056] Parameter Frame of the example Frame of the comparative example Material 6061-T6 Q235 Thickness (mm) 2.0±0.1 2.5±0.1 Surface treatment Anodizing Galvanizing

[0057] 2. Rigidity test comparison data table

[0058] 2.1 Static bending rigidity test:

[0059] Test item Data of the example Data of the comparative example Improvement rate Deformation under 3000N load (mm) 2.12±0.08 3.85±0.12 45.0％ Stiffness value (N / mm) 1415±25 779±18 81.6％ Elastic recovery rate (%) 99.2 97.5 1.7％

[0060] 2.2 Torsional rigidity test (200 Nm torque):

[0061] Parameter Example Comparative example Improvement rate Torsion angle (°) 1.23±0.05 2.37±0.08 48.1％ Stiffness (Nm / °) 162.6±3.2 84.4±2.7 92.7％ Residual deformation (mm) 0.15 0.38 60.5％

[0062] 2.3 Dynamic fatigue test:

[0063] Number of cycles (in ten thousands) Status of the example Status of the control example 10 No visible deformation Micro-cracks in the weld 20 Normal Deformation of 1.2mm 50 Slight deformation Fracture

[0064] 2.4 Modal analysis results:

[0065] Vibration mode Frequency of the example (Hz) Frequency of the control example (Hz) Improvement First order 58.7 42.3 38.8％ Second order 127.4 89.6 42.2％

[0066] 3. Analysis of test results

[0067] 3.1 Effect of structural optimization:

[0068] The middle anti-deformation support column contributes approximately 35% to the stiffness improvement; The reinforced raised plate design contributes approximately 20% to the increase in modal frequency; The symmetric structure design reduces the stress concentration coefficient by up to 40%;

[0069] 3.2 Weight comparison:

[0070] Item Example Control example Change Total weight (kg) 8.7 10.2 -14.7％ Weight-stiffness ratio 0.163 0.131 +24.4％

[0071] II. Heat dissipation effect test:

[0072] 1. Battery compartment temperature comparison (ambient temperature 25°C):

[0073] Test condition Example (temperature) Comparative example (temperature) Continuous operation for 1 hour 38℃ 45℃ Continuous operation for 2 hours 42℃ 52℃

[0074] 2. Optimization effect of heat dissipation holes:

[0075] The combined design of the heat dissipation mesh holes (501) and the long heat dissipation holes (601) increases the air flow rate by 35%; the temperature uniformity test shows that the maximum temperature difference in the battery compartment is reduced from 8°C in the traditional design to 3°C; Test method: Use a FLIR T1020 infrared thermal imager, and the test condition is continuous discharge at rated power.

[0076] III. Verification of improved assembly efficiency

[0077] Batch production test data:

[0078] 1. Assembly time for a single frame:

[0079] Traditional process: 25.3 minutes

[0080] Process of the present invention: 16.8 minutes

[0081] Efficiency improvement: (25.3 - 16.8) / 25.3 × 100% = 33.6%

[0082] 2. Comparison of qualification rates:

[0083] Example: 98.7% (n = 1000);

[0084] Control example: 92.3% (n = 1000);

[0085] 3. Positioning accuracy:

[0086] Error of the distance between the frame plates: ±0.15 mm (±0.5 mm for the traditional process);

[0087] Position degree of the welding of the front fork tube: 0.2 mm (0.8 mm for the traditional process).

[0088] The frame plate one and the frame plate two are positioned through the middle anti-deformation support column, effectively shortening the assembly time.

[0089] IV. Optimization effect of wiring management

[0090] 1. Wiring harness fixing test:

[0091] Loosening rate of the wiring harness after the vibration test (50,000 times) of the traditional frame: 23%;

[0092] Loosening rate of the wiring groove structure of the present invention: 2%;

[0093] 2. Wiring efficiency:

[0094] Example: Average wiring time is 3.2 minutes;

[0095] Control example: Average wiring time is 5.8 minutes.

[0096] As described above, it is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes should be covered within the protection scope of the present invention.

Claims

1. An electric motorcycle frame, comprising a frame plate 1 (1) and a frame plate 2 (2) symmetrically arranged, characterized in that: The top of the frame plate 1 (1) and the frame plate 2 (2) are integrally fixedly connected with a top reinforcing plate (8); a top sealing plate (3) is arranged on the frame plate 1 (1) and the frame plate 2 (2) above the top reinforcing plate (8); the top sealing plate (3) is integrally formed with edge buckle plates (301) at both sides of the frame plate 1 (1) and the frame plate 2 (2); a folding edge (302) is integrally formed on one side of the edge buckle plate (301); the folding edge (302) is buckled above the frame plate 1 (1) and the frame plate 2 (2); the top sealing plate (3) is connected to the top reinforcing plate (8) by a hinge; and end sealing plates (4) are welded to the ends of the frame plate 1 (1) and the frame plate 2 (2); A middle anti-deformation support column (12) for reinforcement is arranged between the frame plate 1 (1) and the frame plate 2 (2); the middle anti-deformation support column (12) is connected to the frame plate 1 (1) and the frame plate 2 (2) via anti-screw screws.

2. The electric motorcycle frame according to claim 1, characterized in that: The bottom of the frame plate 1 (1) and the frame plate 2 (2) are integrally fixedly connected with a bottom sealing plate 1 (5), and the other side of the bottom of the frame plate 1 (1) and the frame plate 2 (2) is fixedly connected with a bottom sealing plate 2 (6), an arc-shaped groove 1 (503) is provided at the end of the bottom sealing plate 1 (5), a wire passing circular hole (502) is provided on the bottom sealing plate 1 (5) at one side of the arc-shaped groove 1 (503), and a heat dissipation mesh hole (501) is provided on the bottom sealing plate 1 (5) at one side of the wire passing circular hole (502).

3. The electric motorcycle frame according to claim 2, characterized in that: The bottom sealing plate 2 (6) is provided with a plurality of long heat dissipation holes (601), and a mounting fixing plate (7) fixedly connected to the frame plate 1 (1) and the frame plate 2 (2) is provided below the bottom sealing plate 2 (6), and the mounting fixing plate (7) is provided with a fixed long hole (701).

4. The electric motorcycle frame according to claim 3, characterized in that: The heat dissipation mesh holes (501) are distributed in an array and have a hole diameter of 5-8 mm. The heat dissipation long holes (601) have a width of 3-5 mm and a length of 15-25 mm.

5. The electric motorcycle frame according to claim 1, characterized in that: A wire passing sealing plate (9) is fixedly connected between the frame plate 1 (1) and the frame plate 2 (2) and located below the end sealing plate (4), and a wire passing long hole (901) is provided on the wire passing sealing plate (9).

6. The electric motorcycle frame according to claim 1, characterized in that: The frame plate 1 (1) and the frame plate 2 (2) are both provided with a reinforcing protruding plate 1 (10) and a reinforcing protruding plate 2 (11) on one side wall away from each other, and the reinforcing protruding plate 1 (10) and the reinforcing protruding plate 2 (11) are connected to the frame plate 1 (1) and the frame plate 2 (2) by built-in screws.

7. The electric motorcycle frame according to claim 1, characterized in that: The thickness of the reinforcing protruding plate 1 (10) and the reinforcing protruding plate 2 (11) is 1.2-1.5 times the thickness of the frame plate 1 (1) and the frame plate 2 (2), and they are fixed by countersunk screws.

8. The electric motorcycle frame according to claim 1, characterized in that: A second arc groove (801) is provided on one side of the top reinforcing plate (8), and the first arc groove (503) and the second arc groove (801) are used for fixing and welding the front fork tube.

9. A method for preparing an electric motorcycle frame, applied to the electric motorcycle frame according to any one of claims 1 to 6, characterized in that: The steps include: S101, cutting: cutting according to the unfolded dimensions of the frame plate 1 (1), the frame plate 2 (2), the top sealing plate (3), the bottom sealing plate 1 (5), the bottom sealing plate 2 (6), the mounting fixing plate (7), the wire-passing sealing plate (9), the top reinforcing plate (8) and the end sealing plate (4); S102, bending and punching: bending and punching the top sealing plate (3) and the second bottom sealing plate (6), and punching the first bottom sealing plate (5), the top reinforcing plate (8), and the over-line sealing plate (9) to punch out corresponding spaces; S103, assembly: first, fix the reinforcing protruding plate 1 (10) and the reinforcing protruding plate 2 (11) on the frame plate 1 (1) and the frame plate 2 (2) by means of anti-screw screws, then install the middle anti-deformation support column (12) between the frame plate 1 (1) and the frame plate 2 (2) by means of screws to achieve the positioning of the distance between the frame plate 1 (1) and the frame plate 2 (2), then weld the top reinforcing plate (8), the bottom sealing plate 1 (5), the bottom sealing plate 2 (6) and the wire sealing plate (9), then weld and fix the fixing plate (7) and the end sealing plate (4), and weld the front fork tube on the arc groove 1 (503) and the arc groove 2 (801); S104, the top sealing plate (3) and the top reinforcing plate (8) are fixed by hinges, and the top sealing plate (3) can be opened and closed along the hinges, so as to facilitate the installation of the battery and the wiring arrangement operation.

10. The method for preparing an electric motorcycle frame according to claim 7, characterized in that: In step S102, the punching process uses a CNC punching machine, and the punching accuracy is controlled within ±0.1mm. In step S103, the installation of the middle anti-deformation support column (12) is assisted by a positioning fixture to ensure the symmetry and spacing accuracy of the frame plate 1 (1) and the frame plate 2 (2). Robot welding is used for welding, and the welding parameters are current 180-220A, voltage 20-24V, and welding speed 5-8mm / s.

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