Welding device for electric bicycle frame production and welding method thereof

Abstract

The invention relates to the technical field of machining, in particular to a welding device for electric bicycle frame production and a welding method thereof, and the welding device is matched with automatic and semi-automatic electric arc welding equipment for use and comprises a mounting plate, a clamping plate and a hydraulic cylinder. The welding device comprises a fixing plate, a clamping mechanism, a reset mechanism, a limiting mechanism, a thermal reaction mechanism, a piston mechanism and a mounting base, during welding, the temperature rises, liquid in the thermal reaction mechanism evaporates and expands to push the piston mechanism to stretch out, and when the piston mechanism stretches out, the limiting mechanism relieves limiting on the clamping mechanism; and meanwhile, the reset mechanism pulls the clamping mechanism to be away from the high-temperature position of the pipe fitting frame. By means of the mode that the clamping mechanism is heated to be separated under the action of the thermal reaction mechanism, the problems that when a frame is welded, materials are softened due to the fact that the temperature around a welding point rises, and a pipe fitting frame positioning device cannot change the clamping force according to the material change, and consequently the positioning device extrudes and deforms the frame are solved.

Description

Technical Field

[0001] This invention relates to the field of machining technology, specifically to a welding device and welding method for the production of electric bicycle frames. Background Technology

[0002] Electric bicycle frames are mostly manufactured using automatic or semi-automatic arc welding equipment for welding and fixing. During the welding process, brackets are needed to support and position the various components of the frame for welding and fixing. Electric bicycle frames are mostly made of materials such as aluminum alloy, steel, or carbon fiber. Among them, aluminum alloy frames are prone to rapid heating of the material around the weld due to heat conduction during welding. The heat-affected zone of aluminum alloy will undergo coarsening, melting, or recrystallization, which will destroy the strengthening mechanism of the material and cause softening.

[0003] Currently, the fixed positioning devices used in the welding production process of electric bicycle frames employ clamping plates to hold positions close to the welding point on the frame to ensure accurate positioning between frames during welding and stability of the frame after welding. This improves the stability of the weld connection. The clamping method for the parts to be welded often uses cylinder-driven clamping plates or screw-positioned clamping plates to enhance clamping stability. This clamping method continuously applies clamping force to the parts to be welded. If the aluminum alloy frame softens at the clamped area due to heat transfer during welding, the clamping force applied by the clamping plate can deform the clamped area. To address this issue, segmented welding is often used to reduce the heat conduction rate, thereby lowering the temperature at the clamped area and preventing clamping deformation. However, segmented welding requires intermittent spot welding, which lengthens the welding time. This can affect delivery efficiency for large-volume production orders, ultimately reducing the processing efficiency of electric bicycle frames.

[0004] To address this, a welding device and welding method for the production of electric bicycle frames are proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a welding device and welding method for the production of electric bicycle frames. By using a clamping mechanism that detaches upon heating, the invention solves the problem that during frame welding, the material softens due to increased temperature around the welding point, and the clamping mechanism cannot adjust its clamping force according to the material change, resulting in the clamping mechanism squeezing and deforming the frame. The invention has the effect of preventing the frame from being deformed by clamping when high temperature softens around the frame welding point, while avoiding the effect of segmented welding which increases welding time and reduces processing efficiency.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A welding apparatus for the production of electric bicycle frames includes components used in conjunction with automatic or semi-automatic arc welding equipment. These components include a mounting plate, a vertical plate, a head tube, a pipe frame, a fixed base, a clamping plate, and a hydraulic cylinder. The apparatus also includes a fixed plate, a clamping mechanism, a reset mechanism, a limiting mechanism, a thermal reaction mechanism, a piston mechanism, and a mounting base. The fixed plate and the mounting base are symmetrically mounted on the top surface of the mounting plate. The clamping mechanism is slidably connected to the top surface of the mounting base. The reset mechanism and the limiting mechanism are both connected to the top surface of the mounting plate, and the reset mechanism is connected to the clamping mechanism. The thermal reaction mechanism is connected to one side of the clamping mechanism. The piston mechanism communicates with the thermal reaction mechanism and extends above the limiting mechanism. During welding, as the temperature rises, the liquid inside the thermal reaction mechanism evaporates and expands, pushing the piston mechanism outward. When the piston mechanism extends, the limiting mechanism releases its restriction on the clamping mechanism. Simultaneously, the reset mechanism pulls the clamping mechanism away from the high-temperature area of ​​the pipe frame.

[0007] In the above design, by pushing the clamping mechanism, the pipe fitting rack to be welded can be moved towards the head pipe, and the welding point of the pipe fitting rack is brought into contact with the welding point of the head pipe. With the cooperation of the limiting mechanism, the clamping mechanism remains stable after the pipe fitting rack is in contact with and positioned with the head pipe, thereby preventing the weld point from shifting during the welding process. When the area around the welding point of the pipe fitting rack becomes hot due to the influence of the weld point, causing the material around the weld point to soften, the heat reaction mechanism promptly takes action to push the piston mechanism downward, thereby pushing the limiting mechanism to disengage from the clamping mechanism through the piston mechanism, causing the clamping mechanism to disengage from the limiting mechanism. Under the action of the reset mechanism, the limiting mechanism is also disengaged from the pipe fitting rack, thereby preventing the clamping mechanism from clamping and deforming the overheated part of the pipe fitting rack.

[0008] Preferably, the clamping mechanism includes a push plate, a connecting block, a slider, and an arc plate. The push plate slides against the top surface of the mounting base. The connecting blocks are symmetrically fixedly connected to both sides of the push plate, and the two connecting blocks extend to both sides of the mounting base respectively. The mounting base has symmetrical grooves on both sides. The two sliders are slidably connected inside the two grooves respectively, and one side of each slider is fixedly connected to the connecting block.

[0009] In the above design, the two sets of connecting blocks and sliders on the side wall of the push plate in the clamping mechanism slide along the groove opened on the side wall of the mounting base, which can effectively limit the sliding direction of the push plate and further improve the stability of the push plate when sliding.

[0010] Preferably, the arc-shaped plate is fixedly connected to the side of the push plate near the pipe fitting rack, and the inner diameter of the arc-shaped plate matches the curvature of the side wall of the pipe fitting rack.

[0011] In the above design, thanks to the matching of the inner diameter of the arc plate with the curvature of the outer wall of the pipe fitting rack, the contact area between the arc plate and the pipe fitting rack can be increased, thereby further improving the stability of the arc plate when it squeezes and limits the pipe fitting rack.

[0012] Preferably, the reset mechanism includes a fixing block and a spring. The fixing block is fixedly connected to the top surface of the mounting base, one end of the spring is symmetrically fixedly connected to the side wall of the fixing block, and the other end of the spring is fixedly connected to the side wall of the push plate.

[0013] In the above design, the spring does not need to be a high-strength spring. It only needs to be able to pull the clamping mechanism back to its initial state after the clamping mechanism is disengaged from the limit mechanism.

[0014] Preferably, the limiting mechanism includes a locking block, a push spring, and a mounting groove. The mounting groove is formed on the top surface of the mounting base. The locking block is slidably connected inside the mounting groove. One end of the push spring is symmetrically and fixedly connected to the bottom of the locking block, and the other end of the push spring is fixedly connected to the lower end of the inside of the mounting groove.

[0015] In the above design, the outer wall of the card block slides and fits into the inner wall of the mounting groove, thereby limiting the sliding direction of the card block through the mounting groove and preventing the card block from shaking significantly in the mounting groove, which would reduce the stability of the card block.

[0016] Preferably, one end of the card block extends above the mounting groove, and the top surface of the card block near the fixing block is arc-shaped.

[0017] In the above design, the arc-shaped surface of the top of the card block is the priority contact end with the push plate in the clamping mechanism. This ensures that when the push plate is pushed to move towards the limiting mechanism, the push plate will first contact the arc-shaped surface of the card block. As pressure is applied to the push plate, the card block can be pushed into the mounting groove and compressed, thereby automatically passing over the limiting mechanism and being limited and fixed by the limiting mechanism without the need for personnel intervention.

[0018] Preferably, the thermal reaction mechanism includes an arc-shaped block, an arc-shaped cavity, and a connecting pipe. The arc-shaped block is connected to the side of the arc-shaped plate near the welding point. The arc-shaped cavity is opened inside the arc-shaped block. The connecting pipe is fixedly connected to the arc-shaped block, and the arc-shaped cavity communicates with the connecting pipe.

[0019] Preferably, the piston mechanism includes a piston tube, a push rod, a piston block, and a tension spring. The piston tube is connected to the end of a connecting pipe near its top surface. The piston block is slidably connected inside the piston tube. The top surface of the push rod is fixedly connected to the bottom of the piston block. The top surface of the tension spring is fixedly connected to the upper inside of the piston tube. The bottom of the tension spring is connected to the top surface of the piston block. The push rod extends downward to the outside of the piston tube, and the bottom of the push rod extends to the top surface of the locking block.

[0020] In the above design, the arc-shaped cavity is filled with distilled water. When the pipe rack connected to the arc-shaped block reaches a high temperature, the temperature will be conducted to the distilled water in the arc-shaped cavity in real time. The distilled water will gradually boil and generate high-pressure steam, which will enter the piston tube in the piston mechanism through the connecting pipe. The piston in the piston tube will push the push rod to move, and the push rod will push the locking block in the limiting mechanism to disengage from the push plate in the clamping mechanism, thereby contacting the limit of the clamping mechanism and disengaging the clamping mechanism from the high-temperature pipe rack, preventing the clamping mechanism from clamping and deforming the pipe rack.

[0021] Preferably, a support frame is symmetrically fixedly connected to the side of the push plate away from the arc plate, and a limit block is fixedly connected to the bottom end of the support frame. Two limit grooves are symmetrically opened on the top surface of the mounting base, and the two limit blocks are slidably connected inside the two limit grooves respectively.

[0022] In the above design, when the push plate slides, it will simultaneously drive the support frame to slide, and drive the limiting block fixedly connected to the bottom of the support frame to slide along the limiting groove opened on the top surface of the mounting seat, thereby further improving the stability of the push plate when sliding. In addition, the support frame is triangular, which can further improve the longitudinal strength of the push plate.

[0023] A welding method, applicable to welding apparatus for the production of electric bicycle frames, includes the following steps: S1. The head tube in the frame is fixed by the upright plate. Then the tube frame is placed between two sets of fixed seats and clamping plates. Then the push plate in the clamping mechanism is pushed to move the arc plate closer to the tube frame and push the tube frame to fit with the head tube. When the push plate passes the limiting mechanism, the push spring in the limiting mechanism will push the locking block to limit the push plate, thereby positioning the tube frame. At this time, the clamping plate is pushed by two hydraulic cylinders to clamp the tube frame between the clamping plate and the fixed seat, thereby further improving the stability of the tube frame. At this time, the head tube and the tube frame can be welded by automatic and semi-automatic electric arc welding equipment. S2. When the push plate is pushed to one side of the pipe fitting rack, the push plate stretches the two springs in the reset mechanism. At the same time, thanks to the arc-shaped limited contact end between the locking block in the limiting mechanism and the push plate, when the push plate contacts the arc-shaped surface of the locking block, as the push plate continues to push, the locking block will retract into the mounting groove and compress the push spring until the push plate passes the locking block. Then, the push spring pushes the locking block to move upward to limit and fix the push plate. At the same time, the arc-shaped plate on one side of the push plate will push the pipe fitting rack to position and fit with the head tube. S3. The heat reaction mechanism is installed on the side of the arc-shaped plate near the weld point. During welding, the heat from the weld point is transferred through the pipe fitting frame and preferentially contacts the heat reaction mechanism. As the weld point continues to weld, the heat from the weld point will spread on the pipe fitting frame, causing the temperature at the heat reaction mechanism to rise continuously. The liquid in the arc-shaped cavity inside the mechanism boils and evaporates, generating high-temperature and high-pressure gas. When the heat around the weld point of the pipe fitting frame is sufficient to evaporate the liquid in the arc-shaped cavity, the pipe fitting frame and the head pipe are tightly connected by the welding action. At this time, even if the clamp is released, there will be no separation. The high-temperature and high-pressure gas is input into the piston tube in the piston mechanism through the connecting pipe and pushes the piston in the piston tube to move downward. When the piston moves, it pushes the push rod to extend. The push rod retracts the locking block connected to its bottom into the mounting groove and compresses the spring again. When the locking block moves to the bottom of the push plate, the push plate will be pulled by the two springs, thereby causing the arc-shaped plate to separate from the pipe fitting frame and preventing the clamping plate from squeezing and deforming the pipe fitting frame due to excessive temperature.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention uses a clamping mechanism and a limiting mechanism to position and fix the pipe fitting frame, so that the welding points of the pipe fitting frame and the head pipe are closely connected to each other, thereby facilitating the positioning welding between the pipe fitting frame and the head pipe, improving the connection stability between the pipe fitting frame and the head pipe, and preventing displacement during welding. 2. In this invention, the heat reaction mechanism contacts the weld points of the pipe fitting frame. When the temperature around the weld points is too high, which can easily cause the material of the pipe fitting frame to soften, the temperature around the weld points of the pipe fitting frame causes the liquid in the heat reaction mechanism to boil and evaporate, generating high-pressure gas. The high-pressure gas enters the piston tube in the piston mechanism through the connecting pipe and pushes the piston block and push rod in the piston tube to move down. When the push rod moves down, it pushes the locking block in the limiting mechanism to retract into the mounting groove until the locking block disengages from the push plate. Then, the reset mechanism drives the push plate and the arc plate to disengage from the pipe fitting frame, preventing the arc plate from squeezing and deforming the high-temperature pipe fitting frame. 3. In the present invention, under normal circumstances, the piston in the piston mechanism is positioned at the bottom of the connection between the piston tube and the connecting pipe by the tension of the tension spring. This allows the piston block to move upward as the tension spring pulls the high-pressure gas in the piston tube, so that the condensate in the piston tube is pushed by the piston block and discharged into the arc-shaped cavity through the connecting pipe again, preventing liquid from accumulating in the piston tube. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 Enlarged diagram of part A in the middle; Figure 3 This is a schematic diagram of the mounting base, reset mechanism, and limiting mechanism in this invention; Figure 4 This is a schematic diagram of the clamping mechanism, thermal reaction mechanism, and piston mechanism in this invention; Figure 5 This is a cross-sectional view of the arc-shaped block and the connecting pipe in this invention; Figure 6 This is a cross-sectional view of the piston tube in this invention; Figure 7 This is a schematic diagram showing the connection between the arc-shaped plate and the arc-shaped block in this invention; Figure 8 This is a schematic diagram of the structure of the fixing plate in this invention.

[0026] In the diagram: 1. Mounting plate; 2. Vertical plate; 3. Head tube; 4. Pipe rack; 5. Fixed seat; 6. Clamping plate; 7. Hydraulic cylinder; 8. Fixed plate; 9. Clamping mechanism; 901. Push plate; 902. Connecting block; 903. Slider; 904. Arc plate; 10. Reset mechanism; 1001. Fixed block; 1002. Spring; 11. Limiting mechanism; 1101. Mounting groove; 1102. Push spring; 1103. Locking block; 12. Thermal reaction mechanism; 1201. Arc block; 1202. Arc cavity; 1203. Connecting pipe; 13. Piston mechanism; 1301. Piston tube; 1302. Push rod; 1303. Piston block; 1304. Tension spring; 14. Mounting seat; 15. Support frame; 16. Limiting block; 17. Limiting groove. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figures 1 to 8 This invention provides a welding device and welding method for the production of electric bicycle frames, the technical solution of which is as follows: Reference Figures 1 to 8A welding device for the production of electric bicycle frames, used in conjunction with automatic and semi-automatic arc welding equipment, includes a mounting plate 1, a vertical plate 2, a head tube 3, a pipe fitting rack 4, a fixing seat 5, a clamping plate 6, and hydraulic cylinders 7. The vertical plate 2 is vertically fixedly installed on one side of the top surface of the mounting plate 1, and a positioning sleeve is fixedly installed on the side wall of the vertical plate 2. The head tube 3 is fixed to one side of the vertical plate 2 by the positioning sleeve. The fixing seat 5 and the clamping plate 6 are symmetrically fixedly installed on the top surface of the mounting plate 1. The hydraulic cylinders 7 are symmetrically fixedly installed on the top surface of the mounting plate 1, and the telescopic ends of the two hydraulic cylinders 7 are respectively fixedly connected to the side walls of the two clamping plates 6. The pipe fitting rack 4 is placed between the two sets of fixing seats 5 and clamping plates 6. The device also includes a fixing plate 8, a clamping mechanism 9, a reset mechanism 10, a limiting mechanism 11, a thermal reaction mechanism 12, a piston mechanism 13, and a mounting seat 14. The fixing plate 8 and the mounting seat 14 are symmetrically installed on the top surface of the mounting plate 1. An arc-shaped baffle is fixedly connected to the side of the fixing plate 8 near the mounting seat 14. The arc-shaped baffle matches the outer side of the pipe rack 4. The clamping mechanism 9 is slidably connected to the top surface of the mounting base 14, and the height of the clamping mechanism 9 is the same as the height of the fixing plate 8. In order to ensure the accuracy of the positioning between the frames during welding and the stability of the frames after welding, the clamping position of the clamping mechanism 9 on the pipe rack 4 will be close to the position on the pipe rack 4 that is closer to the welding point, thereby improving the stability of the welding connection. The reset mechanism 10 and the limiting mechanism 11 are both connected to the top surface of the mounting plate 1, and the reset mechanism 10 is connected to the clamping mechanism 9. The thermal reaction mechanism 12 is connected to one side of the clamping mechanism 9. The piston mechanism 13 is connected to the thermal reaction mechanism 12 and extends above the limiting mechanism 11. When the temperature rises during welding, the liquid inside the thermal reaction mechanism 12 evaporates and expands, pushing the piston mechanism 13 to extend. When the piston mechanism 13 extends, the limiting mechanism 11 releases the limiting of the clamping mechanism 9. At the same time, the reset mechanism 10 pulls the clamping mechanism 9 away from the high temperature of the pipe rack 4.

[0029] Reference Figure 1 , Figure 2 , Figure 4The clamping mechanism 9 includes a push plate 901, a connecting block 902, a slider 903, and an arc-shaped plate 904. The push plate 901 slides against the top surface of the mounting base 14. The connecting blocks 902 are symmetrically fixedly connected to both sides of the push plate 901, and the two connecting blocks 902 extend to both sides of the mounting base 14. The mounting base 14 has symmetrically opened grooves on both sides. The two sliders 903 are slidably connected inside the two grooves, and one side of each slider 903 is fixedly connected to the connecting block 902. Both connecting blocks 902... The mounting base 14 is L-shaped, with two connecting blocks 902 extending to both sides. The push plate 901 is limited and slides on the top surface of the mounting base 14 under the action of the two connecting blocks 902 and the sliders 903. The two sliders 903 further improve the stability of the push plate 901 during sliding and also enhance its longitudinal strength. An arc-shaped plate 904 is fixedly connected to the side of the push plate 901 near the pipe fitting bracket 4, and the inner diameter of the arc-shaped plate 904 matches the curvature of the side wall of the pipe fitting bracket 4. The curvature of the arc-shaped baffle on the side wall of the fixed plate 8 matches the curvature of the arc-shaped baffle. When the push plate 901 drives the arc-shaped plate 904 to push the pipe fitting frame 4 towards the fixed plate 8, the pipe fitting frame 4 can be clamped between the arc-shaped plate 904 and the arc-shaped baffle. At this time, because the curvature of the inner wall of the arc-shaped plate 904 and the arc-shaped baffle matches the curvature of the outer wall of the pipe fitting frame 4, the clamping stability of the pipe fitting frame 4 can be further improved. A support frame 15 is symmetrically fixedly connected to the side of the push plate 901 away from the arc-shaped plate 904. The bottom end of the support frame 15 is fixed. The mounting base 14 has two symmetrically opened limiting grooves 17 on its top surface. The two limiting blocks 16 are slidably connected inside the two limiting grooves 17 respectively. When the push plate 901 slides, it will synchronously drive the support frame 15 to slide, and drive the limiting blocks 16 fixedly connected to the bottom of the support frame 15 to slide along the limiting grooves 17 opened on the top surface of the mounting base 14, thereby further improving the stability of the push plate 901 when sliding. In addition, the support frame 15 is triangularly set, which can further improve the longitudinal strength of the push plate 901.

[0030] Reference Figure 2 , Figure 3The reset mechanism 10 includes a fixing block 1001 and a spring 1002. The fixing block 1001 is fixedly connected to the top surface of the mounting base 14. One end of the spring 1002 is symmetrically fixedly connected to the side wall of the fixing block 1001, and the other end of the spring 1002 is fixedly connected to the side wall of the push plate 901. The springs 1002 in the upper reset mechanism 10 are arranged symmetrically, which can achieve a relatively uniform distribution of tension when the reset mechanism 10 pulls the clamping mechanism 9 to move, thereby preventing the clamping mechanism 9 from tilting or jamming when sliding. The limiting mechanism 11 includes a locking block 1103, a push spring 1102, and a mounting groove 1101. The mounting groove 1101 is opened on the top surface of the mounting base 14. The locking block 1103 is slidably connected inside the mounting groove 1101. One end of the push spring 1102 is symmetrically fixedly connected to the bottom of the locking block 1103. The other end of 02 is fixedly connected to the lower end of the interior of the mounting groove 1101. One end of the locking block 1103 extends to the top of the mounting groove 1101, and the top surface of the locking block 1103 is arc-shaped near the fixing block 1001. Thanks to the arc-shaped arrangement of the priority contact end between the top surface of the locking block 1103 and the push plate 901 in the clamping mechanism 9, the locking block 1103 can be pushed by the push plate 901 to apply a pushing force to the locking block 1103, which can drive the locking block 1103 to retract into the mounting groove 1101 until the push plate 901 passes the locking block 1103. After the push plate 901 passes the locking block 1103, the compressed push spring 1102 will push the locking block 1103 to reset again, thereby fixing and limiting the push plate 901 in the clamping mechanism 9. After the push plate 901 passes the locking block 1103, the arc plate 904 on the side wall of the push plate 901 will also complete the squeezing and positioning of the pipe frame 4.

[0031] Reference Figure 4 , Figure 5The thermal reaction mechanism 12 includes an arc-shaped block 1201, an arc-shaped cavity 1202, and a connecting pipe 1203. The arc-shaped block 1201 is connected to the side of the arc-shaped plate 904 near the welding point. The arc-shaped cavity 1202 is formed inside the arc-shaped block 1201. The connecting pipe 1203 is fixedly connected to the arc-shaped block 1201, and the arc-shaped cavity 1202 is connected to the connecting pipe 1203. Two symmetrical connecting slots are formed in the arc-shaped cavity 1202 and connected to the connecting pipe 1203. The upper connecting slot can conduct high-pressure gas to the connecting pipe 1203 when the liquid in the arc-shaped cavity 1202 evaporates. After the high-pressure gas in the connecting pipe 1203 condenses, it can flow back to the arc-shaped cavity 1202 through the lower connecting slot. The connecting pipe 1203 is slightly inclined, which can further... To facilitate the return of condensate, the inner wall curvature of the arc-shaped block 1201 is the same as that of the arc-shaped plate 904. Therefore, when the inner wall of the arc-shaped plate 904 is attached to the side wall of the pipe fitting rack 4, the inner wall of the arc-shaped block 1201 will also be attached to the side wall of the pipe fitting rack 4 simultaneously. Furthermore, the opening point of the arc-shaped cavity 1202 in the arc-shaped block 1201 is close to the inner wall of the arc-shaped block 1201. This allows the temperature to be conducted to the arc-shaped cavity 1202 immediately when the pipe fitting rack 4 at the contact position of the arc-shaped block 1201 reaches a high temperature, and to exchange heat with the liquid in the arc-shaped cavity 1202. At the same time, thanks to the fact that the arc-shaped block 1201 is connected to the side of the arc-shaped plate 904 near the welding point, when the temperature of the welding point is conducted to the area around the welding point, the arc-shaped block 1201 can preferentially contact the high-temperature point and react as quickly as possible.

[0032] Reference Figure 4 , Figure 5The piston mechanism 13 includes a piston tube 1301, a push rod 1302, a piston block 1303, and a tension spring 1304. The piston tube 1301 is connected to the end of the connecting pipe 1203 near its top surface. The piston block 1303 is slidably connected inside the piston tube 1301. A high-temperature resistant rubber gasket is fixedly sleeved on the side wall of the piston block 1303 to further improve its sealing performance. The top surface of the push rod 1302 is fixedly connected to the bottom of the piston block 1303. The top surface of the tension spring 1304 is fixedly connected to the upper inside of the piston tube 1301. The bottom of the tension spring 1304 is connected to the top surface of the piston block 1303. Here, the tension spring 1304 does not need to be a high-strength spring; it only needs to assist the piston block 1303 in resetting when the high-pressure gas condenses. The push rod 1302 extends downward to the outside of the piston tube 1301, and the bottom of the push rod 1302 extends to the locking block 1103. On the top surface, the bottom of the push rod 1302 slides and fits against the top surface of the clamping block 1103. Therefore, when the push rod 1302 is pushed by the piston block 1303, the push rod 1302 can transmit the downward pressure to the clamping block 1103 immediately, push the clamping block 1103 to move, and realize the separation of the clamping mechanism 9 from the limiting mechanism 11. At this time, under the action of the reset mechanism 10, the clamping mechanism 9 will be driven to separate from the pipe frame 4, preventing the clamping mechanism 9 from clamping and deforming the pipe frame 4. When the temperature around the weld point of the pipe frame 4 is enough to make the liquid in the thermal reaction mechanism 12 boil and evaporate, then part of the weld between the pipe frame 4 and the head tube 3 will also be welded and fixed. The welded and fixed part is sufficient to ensure that the pipe frame 4 will not separate from the head tube 3 after it is separated from the clamping of the arc plate 904. When the clamping mechanism 9 is separated from the pipe frame 4, the fixed seat 5 and the clamping plate 6 are still stably clamped on the pipe frame 4 under the action of the hydraulic cylinder 7.

[0033] A welding method, applicable to a welding apparatus for the production of electric bicycle frames, includes the following steps: S1. The head tube 3 in the frame is fixed by the upright plate 2. Then the tube frame 4 is placed between the two sets of fixed seats 5 and the clamping plate 6. Then the push plate 901 in the clamping mechanism 9 is pushed to drive the arc plate 904 to move closer to the tube frame 4 and push the tube frame 4 to fit with the head tube 3. When the push plate 901 passes the limiting mechanism 11, the push spring 1102 in the limiting mechanism 11 will push the card block 1103 to limit the push plate 901, thereby positioning the tube frame 4. At this time, the clamping plate 6 is pushed by two hydraulic cylinders 7 to clamp the tube frame 4 between the clamping plate 6 and the fixed seat 5, thereby further improving the stability of the tube frame 4. At this time, the head tube 3 and the tube frame 4 can be welded by automatic and semi-automatic electric arc welding equipment. S2. When the push plate 901 is pushed to move to one side of the pipe fitting frame 4, the push plate 901 stretches the two springs 1002 in the reset mechanism 10. At the same time, thanks to the arc-shaped limited contact end between the locking block 1103 in the limiting mechanism 11 and the push plate 901, when the push plate 901 contacts the arc-shaped surface of the locking block 1103, as the push plate 901 continues to push, the locking block 1103 will retract into the mounting groove 1101 and compress the push spring 1102 until the push plate 901 passes the locking block 1103. Then, the push spring 1102 pushes the locking block 1103 to move upward and limit and fix the push plate 901. At the same time, the arc-shaped plate 904 on one side of the push plate 901 will push the pipe fitting frame 4 to position and fit the head tube 3. S3. The heat reaction mechanism 12 is installed on the side of the arc-shaped plate 904 near the weld point. During welding, the heat from the weld point is transferred through the pipe fitting frame 4 and preferentially contacts the heat reaction mechanism 12. As the weld point continues to weld, the heat from the weld point will spread on the pipe fitting frame 4, causing the temperature at the heat reaction mechanism 12 to rise continuously. The liquid in the arc-shaped cavity 1202 inside the mechanism boils and evaporates, generating high-temperature and high-pressure gas. When the heat around the weld point on the pipe fitting frame 4 is sufficient to evaporate the liquid in the arc-shaped cavity 1202, the pipe fitting frame 4 and the head pipe 3 are also tightly connected by the welding action. At this time, even if the clamp is released, there will be no separation. The body is fed into the piston tube 1301 in the piston mechanism 13 through the connecting pipe 1203, and pushes the piston block 1303 in the piston tube 1301 to move downward. When the piston block 1303 moves, it pushes the push rod 1302 to extend. The push rod 1302 retracts the locking block 1103 connected to its bottom into the mounting groove 1101 and compresses the spring 1002 again. When the locking block 1103 moves to the bottom of the push plate 901, the push plate 901 will be pulled by the two springs 1002, thereby causing the arc plate 904 to disengage from the pipe bracket 4, preventing the clamping plate from squeezing and deforming the pipe bracket 4 which is too hot.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A welding device for the production of electric bicycle frames, used in conjunction with automatic and semi-automatic electric arc welding equipment, comprising a mounting plate (1), a vertical plate (2), a head tube (3), a pipe frame (4), a fixing seat (5), a clamping plate (6), and a hydraulic cylinder (7), characterized in that: It also includes a fixing plate (8), a clamping mechanism (9), a reset mechanism (10), a limiting mechanism (11), a thermal reaction mechanism (12), a piston mechanism (13), and a mounting base (14). The fixing plate (8) and the mounting base (14) are symmetrically mounted on the top surface of the mounting plate (1). The clamping mechanism (9) is slidably connected to the top surface of the mounting base (14). The reset mechanism (10) and the limiting mechanism (11) are both connected to the top surface of the mounting plate (1), and the reset mechanism (10) and the clamping mechanism (9) are connected. Next, the thermal reaction mechanism (12) is connected to one side of the clamping mechanism (9). The piston mechanism (13) is connected to the thermal reaction mechanism (12) and extends above the limiting mechanism (11). When welding, the temperature rises and the liquid inside the thermal reaction mechanism (12) evaporates and expands, pushing the piston mechanism (13) to extend. When the piston mechanism (13) extends, the limiting mechanism (11) releases the limiting of the clamping mechanism (9). At the same time, the reset mechanism (10) pulls the clamping mechanism (9) away from the high temperature of the pipe rack (4).

2. The welding apparatus for producing electric bicycle frames according to claim 1, characterized in that: The clamping mechanism (9) includes a push plate (901), a connecting block (902), a slider (903), and an arc plate (904). The push plate (901) slides against the top surface of the mounting base (14). The connecting blocks (902) are symmetrically fixedly connected to both sides of the push plate (901), and the two connecting blocks (902) extend to both sides of the mounting base (14). The mounting base (14) has symmetrically provided grooves on both sides. The two sliders (903) slide in the two grooves respectively, and one side of the two sliders (903) is fixedly connected to the connecting block (902).

3. The welding apparatus for producing electric bicycle frames according to claim 2, characterized in that: The arc plate (904) is fixedly connected to the side of the push plate (901) near the pipe rack (4), and the inner diameter of the arc plate (904) matches the curvature of the side wall of the pipe rack (4).

4. The welding apparatus for producing electric bicycle frames according to claim 3, characterized in that: The reset mechanism (10) includes a fixing block (1001) and a spring (1002). The fixing block (1001) is fixedly connected to the top surface of the mounting base (14). One end of the spring (1002) is symmetrically fixedly connected to the side wall of the fixing block (1001), and the other end of the spring (1002) is fixedly connected to the side wall of the push plate (901).

5. The welding apparatus for producing electric bicycle frames according to claim 1, characterized in that: The limiting mechanism (11) includes a locking block (1103), a push spring (1102), and a mounting groove (1101). The mounting groove (1101) is opened on the top surface of the mounting base (14). The locking block (1103) is slidably connected inside the mounting groove (1101). One end of the push spring (1102) is symmetrically fixedly connected to the bottom of the locking block (1103), and the other end of the push spring (1102) is fixedly connected to the lower end of the mounting groove (1101).

6. The welding apparatus for producing electric bicycle frames according to claim 5, characterized in that: One end of the card block (1103) extends above the mounting groove (1101), and the top surface of the card block (1103) near the fixing block (1001) is arc-shaped.

7. The welding apparatus for producing electric bicycle frames according to claim 1, characterized in that: The thermal reaction mechanism (12) includes an arc-shaped block (1201), an arc-shaped cavity (1202), and a connecting pipe (1203). The arc-shaped block (1201) is connected to the side of the arc plate (904) near the welding point. The arc-shaped cavity (1202) is opened inside the arc-shaped block (1201). The connecting pipe (1203) is fixedly connected to the arc-shaped block (1201), and the arc-shaped cavity (1202) is connected to the connecting pipe (1203).

8. The welding apparatus for producing electric bicycle frames according to claim 6, characterized in that: The piston mechanism (13) includes a piston tube (1301), a push rod (1302), a piston block (1303), and a tension spring (1304). The piston tube (1301) is connected to the end of a connecting pipe (1203) near its top surface. The piston block (1303) is slidably connected inside the piston tube (1301). The top surface of the push rod (1302) is fixedly connected to the bottom of the piston block (1303). The top surface of the tension spring (1304) is fixedly connected to the upper inside of the piston tube (1301). The bottom of the tension spring (1304) is connected to the top surface of the piston block (1303). The push rod (1302) extends downward to the outside of the piston tube (1301), and the bottom of the push rod (1302) extends to the top surface of the locking block (1103).

9. The welding apparatus for producing electric bicycle frames according to claim 3, characterized in that: The push plate (901) is symmetrically fixedly connected to a support frame (15) on the side away from the arc plate (904). The bottom end of the support frame (15) is fixedly connected to a limiting block (16). The top surface of the mounting base (14) is symmetrically opened with two limiting grooves (17). The two limiting blocks (16) are slidably connected inside the two limiting grooves (17).

10. A welding method applicable to the welding apparatus for producing electric bicycle frames as described in any one of claims 1-9, characterized in that: Includes the following steps: S1. Fix the head tube (3) in the frame by means of the upright plate (2), then place the tube frame (4) between the two sets of fixed seats (5) and the clamping plate (6), and then push the push plate (901) in the clamping mechanism (9) to drive the arc plate (904) to approach the tube frame (4) and push the tube frame (4) to fit with the head tube (3). When the push plate (901) passes the limit mechanism (11), the push spring (1102) in the limit mechanism (11) will push the card block (1103) to limit the push plate (901) and thus position the tube frame (4). At this time, the clamping plate (6) is pushed by two hydraulic cylinders (7) to clamp the tube frame (4) between the clamping plate (6) and the fixed seat (5), thereby further improving the stability of the tube frame (4). At this time, the head tube (3) and the tube frame (4) can be welded by automatic and semi-automatic electric arc welding equipment. S2. When the push plate (901) moves to one side of the pipe fitting frame (4), the push plate (901) stretches the two springs (1002) in the reset mechanism (10). At the same time, thanks to the arc-shaped limited contact end between the locking block (1103) in the limiting mechanism (11) and the push plate (901), when the arc-shaped surface of the push plate (901) contacts the locking block (1103), as the push plate (901) continues to push, the locking block (1103) will retract into the mounting groove (1101) and compress the push spring (1102) until the push plate (901) passes the locking block (1103). Then, the push spring (1102) pushes the locking block (1103) to move upward to limit and fix the push plate (901). At the same time, the arc-shaped plate (904) on one side of the push plate (901) will push the pipe fitting frame (4) to position and fit with the head tube (3). S3. The heat reaction mechanism (12) is installed on the side of the arc plate (904) near the weld point. During welding, the heat of the weld point is transferred through the pipe frame (4) and comes into contact with the heat reaction mechanism (12) first. As the weld point is continuously welded, the heat of the weld point will spread on the pipe frame (4), causing the temperature at the heat reaction mechanism (12) to rise continuously. The liquid in the arc cavity (1202) inside it boils and evaporates to generate high-temperature and high-pressure gas. When the heat around the weld point of the pipe frame (4) is sufficient to evaporate the liquid in the arc cavity (1202), the pipe frame (4) and the head pipe (3) are also tightly connected under the action of welding. At this time, even if the clamp is loosened, there will be no separation. The high-temperature and high-pressure gas passes through the connection. The tube (1203) is fed into the piston tube (1301) in the piston mechanism (13) and pushes the piston block 1303 in the piston tube (1301) to move downward. When the piston block 1303 moves, it pushes the push rod (1302) to extend. The push rod (1302) retracts the locking block (1103) connected to its bottom into the mounting groove (1101) and compresses the spring (1002) again. When the locking block (1103) moves to the bottom of the push plate (901), the push plate (901) will be pulled by the two springs (1002), thereby causing the arc plate (904) to separate from the pipe bracket (4) and preventing the clamping plate from squeezing and deforming the pipe bracket (4) which is too hot.

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