Welding device

Abstract

The utility model discloses a welding device which comprises a workpiece, a platform base, a clamping head, an up-and-down adjusting structure and a front-and-back moving ejector pin, the workpiece comprises a main shaft and chain wheels arranged at the two ends of the main shaft in a penetrating mode, and the clamping head is arranged on the platform base, located on one side of the main shaft and used for clamping the main shaft. The up-down adjusting structure is arranged below the workpiece and used for supporting the workpiece and adjusting the up-down position of the workpiece, the front-back moving ejector pin is arranged on the side opposite to the clamping head and used for pushing the main shaft in the clamping direction, and the main shaft is provided with a center rotating hole matched with the front-back moving ejector pin and can be coaxially positioned. And through cooperation of the clamping head, the front-back moving ejector pin and the up-down adjusting structure, precise positioning and clamping of the workpiece can be achieved, and the welding accuracy is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of welding, in particular to a welding device. Background Art

[0002] In the prior art, the structure and function of welding devices often have certain limitations and cannot meet the requirements of efficient, accurate and safe welding. For example, when welding workpieces with certain structures, problems such as inaccurate positioning, uneven heating, and inconvenient operation may occur, thereby affecting the welding quality and efficiency. Therefore, improvements are needed. Utility Model Content

[0003] The utility model aims to overcome the deficiencies of the prior art and provide a welding device.

[0004] The technical solution of the utility model provides a welding device, including a workpiece, a platform base, a clamping head, an up-and-down adjustment structure and a forward-and-backward movable ejector, the workpiece including a main shaft and sprockets passing through both ends of the main shaft, the clamping head is arranged on the platform base and located on one side of the main shaft, and is used to clamp the main shaft, the up-and-down adjustment structure is arranged below the workpiece, and is used to support the workpiece and adjust the up-and-down position of the workpiece, the forward-and-backward movable ejector is arranged on the side opposite to the clamping head, and is used to push the main shaft in the clamping direction, and the main shaft is provided with a central rotating hole cooperating with the forward-and-backward movable ejector, and can coaxially position the main shaft.

[0005] Furthermore, it also includes a bracket supporting the platform base and a platform swinging structure installed on the bracket, the platform swinging structure and the bracket are both connected to the bottom of the platform base, and the platform swinging structure can make the platform base swing 45 degrees left and right.

[0006] Furthermore, it also includes at least one induction heating structure, one end of which is slidably mounted on the platform base, and the other end of which is configured as an induction heating head that is in contact with and connected to the workpiece and is used to heat the workpiece.

[0007] Furthermore, the preheating requirements of the induction heating head are: preheating temperature is 200-300° C., and preheating time is greater than 90 seconds.

[0008] Furthermore, it also includes a cloth curtain, which is arranged around the welding device.

[0009] Furthermore, it also includes a preassembly mechanism, which includes an upper and lower lifting structure, a left concentric positioning structure and a right concentric positioning structure. The upper and lower lifting structures are arranged at the lower part to support the middle part of the main shaft, and the left concentric positioning structure and the right concentric positioning structure are respectively located on the left and right sides of the upper and lower lifting structures to ensure the concentricity of the sprocket teeth at both ends.

[0010] Furthermore, the preassembly mechanism also includes two manually tightened nuts, which are respectively sleeved on the two ends of the main shaft and located on the outside of each sprocket to complete the assembly of the main shaft and the sprockets at both ends.

[0011] Furthermore, the left concentric positioning structure includes two cross bars, which are arranged below the sprocket and respectively abut against two teeth of the sprocket.

[0012] Furthermore, the left concentric positioning structure includes two cross bars, which are arranged below the sprocket and respectively abut against two teeth of the sprocket.

[0013] After adopting the above technical solution, the following beneficial effects are achieved:

[0014] The utility model can realize accurate positioning and clamping of the workpiece and ensure the accuracy of welding through the cooperation of the clamping head, the front and rear moving ejector pin and the up and down adjustment structure. The setting of the platform swing structure increases the flexibility of the welding operation. The use of the induction heating structure ensures the uniformity and stability of the workpiece heating and improves the welding quality. The setting of the curtain improves the safety during the welding process. The existence of the pre-assembly mechanism can improve the assembly efficiency and accuracy.

[0015] For example, when welding a specific workpiece, the workpiece is adjusted to a suitable height through the up and down adjustment structure, the spindle is coaxially positioned by moving the ejector pin and the clamping head forward and backward, and then the workpiece is adjusted to the optimal welding angle through the platform swing structure. The induction heating structure heats the workpiece according to the predetermined preheating temperature and time to ensure that the welding part reaches good welding conditions. During the pre-assembly process, the left concentric positioning structure and the right concentric positioning structure can accurately ensure the concentricity of the sprocket teeth, and manually tightening the nut can complete the assembly quickly and conveniently.

[0016] In summary, the welding device provided by the utility model has the advantages of precise positioning, flexible operation, uniform heating, safety and reliability, and efficient assembly, and can effectively improve welding quality and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The disclosure of the present invention will become easier to understand with reference to the accompanying drawings. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings:

[0018] Figure 1 is a three-dimensional diagram of a welding device in one embodiment of the utility model;

[0019] Figure 2 It is a three-dimensional diagram of a welding device in one embodiment of the utility model from another angle;

[0020] Figure 3 It is a three-dimensional diagram of a pre-assembly mechanism in one embodiment of the utility model.

[0021] Reference table of reference numerals:

[0022] 1. Workpiece; 11. Spindle; 12. Sprocket; 2. Platform base; 3. Clamping head; 4. Up and down adjustment structure; 5. Front and rear moving ejector pin; 6. Bracket; 61. Platform swing structure; 7. Induction heating structure; 71. Induction heating head; 8. Cloth curtain; 9. Pre-assembly mechanism; 91. Up and down lifting structure; 92. Left concentric positioning structure; 93. Right concentric positioning structure; 94. Manually tighten the nut. DETAILED DESCRIPTION

[0023] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings.

[0024] It is easy to understand that according to the technical solution of the utility model, without changing the essential spirit of the utility model, a variety of structural modes and implementation modes can be replaced by those skilled in the art. Therefore, the following specific implementation methods and drawings are only exemplary descriptions of the technical solution of the utility model, and should not be regarded as the entirety of the utility model or as a limitation or restriction on the technical solution of the utility model.

[0025] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. They are relative concepts and may change accordingly according to their different positions and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above-mentioned in the present utility model can be understood according to the specific circumstances.

[0027] In some embodiments of the utility model, a workpiece 1, a platform base 2, a clamping head 3, an up-and-down adjustment structure 4 and a forward-and-backward movable ejector 5 are included. The workpiece 1 includes a spindle 11 and a sprocket 12 passing through both ends of the spindle 11. The clamping head 3 is arranged on the platform base 2 and is located on one side of the spindle 11, and is used to clamp the spindle 11. The up-and-down adjustment structure 4 is arranged below the workpiece 1 to support the workpiece 1 and adjust the up-and-down position of the workpiece 1. The forward-and-backward movable ejector 5 is arranged on the side opposite to the clamping head 3, and is used to push the spindle 11 in the clamping direction. The spindle 11 is provided with a central rotating hole cooperating with the forward-and-backward movable ejector 5, which can coaxially position the spindle 11.

[0028] Specifically, the workpiece 1 includes a spindle 11 and a sprocket 12 passing through both ends of the spindle 11. The workpiece 1 is placed on the platform base 2 and supported by the upper and lower adjustment structures 4. The workpiece 1 is the object of the welding operation, and the sprocket 12 is welded to the spindle 11 to form a complete assembly. The workpiece 1 structure of this design is suitable for specific production needs and is convenient for batch welding processing. The platform base 2 is placed on a stable working surface as the basis of the entire device. The platform base 2 provides an installation basis for other components and carries the workpiece 1, providing a stable support platform to ensure that the position of the workpiece 1 is stable during welding and reduce errors. The clamping head 3 is arranged on the platform base 2 and is located on one side of the spindle 11. The clamping head 3 is connected to the platform base 2 by bolts, welding or other fixing methods, and realizes the clamping action through a mechanical transmission structure (such as a lead screw, a slide rail, etc.), and is equipped with a servo motor. The clamping head 3 is used to clamp the spindle 11, and under the drive of the servo motor, the workpiece 1 can be rotated 360° so as to be welded from different angles. The clamping head 3 can ensure that the spindle 11 does not move during welding, and can also flexibly adjust the welding angle of the workpiece 1 to improve welding accuracy and efficiency. The up and down adjustment structure 4 is arranged below the workpiece 1, and the up and down adjustment structure 4 is connected to the platform base 2, and is usually moved up and down by means of a sliding track or a lifting screw. The up and down adjustment structure 4 supports the workpiece 1 and adjusts the up and down position of the workpiece 1 to adapt to different welding requirements. The up and down adjustment structure 4 can flexibly adjust the height of the workpiece 1 according to the welding process requirements to improve the convenience and quality of welding. The forward and backward moving ejector pin 5 is arranged on the other side opposite to the clamping head 3. The forward and backward moving ejector pin 5 is connected to the main body of the device through a transmission structure such as a slide rail and a screw to achieve forward and backward movement. The forward and backward moving ejector pin 5 is pushed in the clamping direction of the spindle 11, and cooperates with the center rotating hole of the spindle 11 to achieve coaxial positioning of the spindle 11. Ensure the accurate positioning of the spindle 11 in the forward and backward directions, and further improve the welding accuracy.

[0029] Working principle: When performing welding operation, first place the workpiece 1 on the platform base 2, and adjust the workpiece 1 to a suitable height by the up and down adjustment structure 4. Then, the clamping head 3 moves to clamp the spindle 11 from one side. At the same time, the forward and backward moving ejector pin 5 is pushed forward from the other opposite side and inserted into the center rotating hole of the spindle 11 to achieve coaxial positioning of the spindle 11. During the welding process, the servo motor of the clamping head 3 can be used to drive the workpiece 1 to rotate 360° as needed so as to perform welding operations from the best angle. For example, when it is necessary to weld the side of the workpiece 1, the servo motor is used to rotate the workpiece 1 to a suitable angle to ensure that the welding position is accurate and convenient. Through the coordinated work of the above-mentioned components, the workpiece 1 can be effectively clamped, positioned and adjusted in angle, thereby achieving high-quality, high-precision, and multi-angle welding operations. This welding device is suitable for welding a variety of workpieces 1 with similar structures, and has broad application prospects and practical value.

[0030] Some embodiments of the utility model also include a bracket 6 supporting the platform base 2 and a platform swing structure 61 installed on the bracket 6. The platform swing structure 61 and the bracket 6 are both connected to the bottom of the platform base 2. The platform swing structure 61 can make the platform base 2 swing 45° left and right.

[0031] Specifically, the bracket 6 is located below the platform base 2, and the bracket 6 is firmly connected to the platform base 2 by welding, bolt connection, etc. The bracket 6 provides stable support for the platform base 2 to ensure the stability of the entire device. The bracket 6 ensures that the platform base 2 will not sink or tilt when carrying the workpiece 1 and other components, thereby improving the reliability of the device. The platform swing structure 61 is installed on the bracket 6 and connected to the bottom of the platform base 2. The platform swing structure 61 is connected to the bracket 6 and the platform base 2 through components such as a transmission shaft and a hinge, and is equipped with a corresponding driving device (such as a motor, a hydraulic device, etc.) to achieve the swinging action. The platform swing structure 61 can make the platform base 2 swing 45° left and right, thereby driving the workpiece 1 to swing 45° left and right. When the workpiece 1 swings 45°, the weld is in a horizontal state, which is conducive to the flow of welding molten iron into the weld. The platform swing structure 61 makes the welding process smoother, improves the welding quality, and avoids welding defects such as molten iron accumulation and uneven welds.

[0032] Working principle: When welding at a specific angle is required, start the driving device of the platform swing structure 61. The driving device drives the platform base 2 to swing 45° left and right relative to the bracket 6 through transmission components such as a transmission shaft or a hinge, so that the workpiece 1 reaches the required angle. For example, when welding workpieces 1 of some special shapes, the workpiece 1 is swung 45°, and the weld is in a horizontal state. During the welding process, molten iron can flow naturally and evenly into the weld to form a uniform and firm weld. Through the synergistic effect of the bracket 6 and the platform swing structure 61, the welding device is provided with stable support and flexible angle adjustment functions, which meets different welding requirements and further improves the practicality and applicability of the welding device.

[0033] In some embodiments of the present invention, at least one induction heating structure 7 is further included. One end of the induction heating structure 7 is slidably mounted on the platform base 2 , and the other end is provided with an induction heating head 71 that is in contact with the workpiece 1 and is used to heat the workpiece 1 .

[0034] Specifically, the number of the induction heating structure 7 is at least one. One end of the induction heating structure 7 is slidably mounted on the platform base 2. The induction heating structure 7 is connected to the platform base 2 through a sliding track or a similar sliding device to ensure that it can move flexibly on the platform base 2. The induction heating head 71 is in contact with the workpiece 1. The induction heating structure 7 is used to heat the workpiece 1 to prepare for welding. The induction heating structure 7 can evenly heat the workpiece 1, improve the welding quality, reduce welding defects, and can flexibly adjust the heating position as needed. The working principle of the induction heating structure 7: before the welding operation, according to the welding part and heating requirements of the workpiece 1, move the induction heating structure 7 so that its induction heating head 71 contacts the corresponding part of the workpiece 1. Start the induction heating structure 7 and heat the workpiece 1 through the principle of electromagnetic induction. Due to the characteristics of induction heating, the temperature of the workpiece 1 can be quickly and evenly increased to reach a suitable welding temperature. For example, when a specific area of ​​the workpiece 1 needs to be welded, the induction heating structure 7 is slid to the corresponding position to heat the area to ensure a good fusion effect during welding and a firm and beautiful weld. By setting the induction heating structure 7, an efficient and accurate heating method is provided for the welding device, further improving the performance of the welding device and the welding effect.

[0035] In some embodiments of the present invention, the preheating requirements of the induction heating head 71 are: the preheating temperature is 200-300° C., and the preheating time is greater than 90 seconds.

[0036] Specifically, before the welding operation, the induction heating structure 7 is started, and the induction heating head 71 begins to heat the workpiece 1. Through precise temperature control and timing, ensure that the workpiece 1 reaches a preheating temperature of 200-300°C and maintains a heating time of more than 90 seconds. Such a preheating process can make the welding part of the workpiece 1 reach good welding conditions, reduce welding stress and deformation, and improve the strength and toughness of the weld. For example, for a workpiece 1 of a specific material, after preheating for more than 90 seconds, the internal structure of the welding part of the workpiece 1 is homogenized, and in the subsequent welding process, defects such as cracks and pores can be effectively avoided, thereby ensuring the stability and reliability of the welding quality. This clear preheating requirement provides a strong guarantee for the stable operation and high-quality welding of the welding device, so that it can adapt to the welding needs of workpieces 1 of different materials and specifications.

[0037] Some embodiments of the present invention further include a cloth curtain 8, which is arranged around the welding device.

[0038] Specifically, the curtain 8 is arranged around the welding device. The curtain 8 is fixed to the peripheral frame or structure of the welding device by means of fixing parts such as hooks, clips, and ropes. The function of the curtain 8 is to isolate the welding area from the outside world. The curtain 8 can effectively block the strong light, sparks and splashes generated during the welding process, protect the eyes and body of the operator from harm, and reduce the impact on the surrounding environment. When performing the welding operation, the curtain 8 surrounds the welding device to form a closed area. The strong light generated during the welding process is blocked by the curtain 8 to avoid directly irradiating the eyes of the operator; the sparks and splashes hit the curtain 8 and are blocked by it and will not spread outward, reducing the safety risk. For example, in actual welding work, the curtain 8 can prevent the surrounding personnel from mistakenly seeing the strong light of welding and damaging their eyesight, and can also prevent sparks from splashing onto nearby objects and causing accidents such as fire. The setting of the curtain 8 provides a relatively safe and isolated working environment for the welding operation, ensuring the safety of the operator and the smooth progress of the work.

[0039] In some embodiments of the utility model, a preassembly mechanism 9 is further included, which includes an upper and lower lifting structure 91, a left concentric positioning structure 92 and a right concentric positioning structure 93. The upper and lower lifting structure 91 is arranged at the bottom to support the middle part of the main shaft 11, and the left concentric positioning structure 92 of the sprocket 12 and the right concentric positioning structure 93 of the sprocket 12 are respectively located on the left and right sides of the upper and lower lifting structure 91 to ensure the concentricity of the teeth of the sprockets 12 at both ends.

[0040] Specifically, the preassembly mechanism 9 includes an upper and lower lifting structure 91 , and the upper and lower lifting structure 91 is arranged below the workpiece 1 .

[0041] The upper and lower lifting structures 91 are connected to the main body of the device by bolts, welding or other fixing methods, and the height adjustment is achieved through a transmission device (such as a lead screw, an electric push rod, etc.). The upper and lower lifting structures 91 are used to support the middle part of the main shaft 11, and can adjust the height to adapt to the main shaft 11 and sprockets 12 of different sizes. The upper and lower lifting structures 91 can flexibly adapt to workpieces 1 of different specifications, improve the versatility and convenience of pre-assembly, reduce the labor intensity of operators, and improve assembly efficiency. The left concentric positioning structure 92 is located on the left side of the upper and lower lifting structures 91. The left concentric positioning structure 92 abuts against the tooth position of the sprocket 12 to ensure the concentricity of the left sprocket 12 and the main shaft 11. The left concentric positioning structure 92 ensures that the sprocket 12 is accurately positioned during the assembly process and improves the assembly accuracy. The right concentric positioning structure 93 is located on the right side of the upper and lower lifting structures 91. The right concentric positioning structure 93 abuts against the tooth position of the sprocket 12 to ensure the concentricity of the right sprocket 12 and the main shaft 11. The right concentric positioning structure 93 ensures that the sprocket 12 is accurately positioned during the assembly process, thereby improving the assembly accuracy. When pre-assembling the workpiece 1, the spindle 11 is lifted to a suitable position by adjusting the height of the upper and lower lifting structures 91 according to the size of the spindle 11 and the sprocket 12. Then, the left concentric positioning structure 92 and the right concentric positioning structure 93 are respectively abutted against the teeth of the sprocket 12 to position the sprocket 12 and ensure the concentricity of the sprockets 12 at both ends with the spindle 11. For example, when assembling spindles 11 of different lengths or sprockets 12 of different specifications, by flexibly adjusting the height of the upper and lower lifting structures 91, it is possible to ensure that the concentric positioning structure accurately functions, thereby providing an accurate pre-assembly basis for subsequent welding operations and improving welding quality and production efficiency. The setting of the pre-assembly mechanism 9, especially the height adjustability of the upper and lower lifting structures 91, enables the welding device to better meet the diverse assembly requirements, further improving the practicality and adaptability of the device.

[0042] In some embodiments of the utility model, the preassembly mechanism 9 also includes two manually tightening nuts 94, which are respectively sleeved on the two ends of the main shaft 11 and located on the outside of each sprocket 12, for completing the assembly of the main shaft 11 and the sprockets 12 at both ends.

[0043] Specifically, the manually tightening nuts 94 are respectively sleeved on both ends of the main shaft 11 and are located on the outer side of each sprocket 12 .

[0044] It is connected to the main shaft 11 through a thread. The manually tightened nut 94 is used to complete the assembly of the main shaft 11 and the sprockets 12 at both ends, and the sprockets 12 are fastened to the designated position on the main shaft 11. The manually tightened nut 94 is simple and convenient to operate, low in cost, and can effectively fix the sprocket 12 to ensure that the sprocket 12 will not loosen or shift during welding and subsequent use. When pre-assembling the workpiece 1, the upper and lower lifting structures 91 are first used to lift the main shaft 11 to a suitable position, and the concentricity of the sprocket 12 and the main shaft 11 is ensured by the left concentric positioning structure 92 and the right concentric positioning structure 93. Then, the manually tightened nut 94 is sleeved on both ends of the main shaft 11 and manually tightened so that the sprocket 12 is firmly assembled on the main shaft 11. For example, in actual operation, the operator first adjusts the height of the upper and lower lifting structures 91, then positions the sprocket 12 through the concentric positioning structure, and finally manually tightens the nut 94. The entire pre-assembly process is fast and accurate, providing a good foundation for subsequent welding work.

[0045] In some embodiments of the present invention, the left concentric positioning structure 92 includes two cross bars, which are disposed below the sprocket 12 and respectively abut against two teeth of the sprocket 12 .

[0046] Specifically, the crossbar of the left concentric positioning structure 92 is arranged below the sprocket 12, and the two crossbars are respectively in contact with the two teeth of the sprocket 12, thereby ensuring the concentricity of the left sprocket 12 and the main shaft 11. The crossbar of the left concentric positioning structure 92 can accurately limit the position of the sprocket 12, ensuring that the concentricity of the sprocket 12 and the main shaft 11 reaches a high precision during the pre-assembly process, thereby improving the quality of subsequent welding and the performance of the product.

[0047] In some embodiments of the present invention, the right concentric positioning structure 93 includes two cross bars, which are disposed below the sprocket 12 and respectively abut against two teeth of the sprocket 12 .

[0048] Specifically, the crossbar of the right concentric positioning structure 93 is arranged below the sprocket 12, and the two crossbars are respectively in contact with the two teeth of the sprocket 12, thereby ensuring the concentricity of the right sprocket 12 and the main shaft 11. The crossbar of the right concentric positioning structure 93 can accurately limit the position of the sprocket 12, ensuring that the concentricity of the sprocket 12 and the main shaft 11 reaches a high precision during the pre-assembly process, thereby improving the quality of subsequent welding and the performance of the product.

[0049] The utility model can realize accurate positioning and clamping of the workpiece 1 through the cooperation of the clamping head 3, the front and rear movable ejector pin 5 and the up and down adjustment structure 4, thereby ensuring the accuracy of welding. The setting of the platform swing structure 61 increases the flexibility of the welding operation. The use of the induction heating structure 7 ensures the uniformity and stability of the heating of the workpiece 1 and improves the welding quality. The setting of the cloth curtain 8 improves the safety during the welding process. The existence of the pre-assembly mechanism 9 can improve the assembly efficiency and accuracy.

[0050] For example, when actually welding a specific workpiece 1, the workpiece 1 is adjusted to a suitable height by the up and down adjustment structure 4, the coaxial positioning of the spindle 11 is achieved by moving the ejector pin 5 and the clamping head 3 forward and backward, and then the workpiece 1 is adjusted to the optimal welding angle by the platform swing structure 61. The induction heating structure 7 heats the workpiece 1 according to the predetermined preheating temperature and time to ensure that the welding part reaches good welding conditions. During the pre-assembly process, the left concentric positioning structure 92 and the right concentric positioning structure 93 can accurately ensure the concentricity of the tooth position of the sprocket 12, and manually tightening the nut 94 can complete the assembly conveniently and quickly.

[0051] In summary, the welding device provided by the utility model has the advantages of precise positioning, flexible operation, uniform heating, safety and reliability, and efficient assembly, and can effectively improve welding quality and efficiency.

[0052] The above are only the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, on the basis of the principles of the present invention, several other modifications can be made, which should also be considered as the protection scope of the present invention.

Claims

1. A welding device, characterized in that: It includes a workpiece, a platform base, a clamping head, an up-and-down adjustment structure and a forward-and-backward movable ejector. The workpiece includes a spindle and a sprocket passing through both ends of the spindle. The clamping head is arranged on the platform base and located on one side of the spindle, and is used to clamp the spindle. The up-and-down adjustment structure is arranged below the workpiece to support the workpiece and adjust the up-and-down position of the workpiece. The forward-and-backward movable ejector is arranged on the side opposite to the clamping head, and is used to push the spindle in the clamping direction. The spindle is provided with a central rotating hole that cooperates with the forward-and-backward movable ejector, which can coaxially position the spindle.

2. The welding device according to claim 1, characterized in that: It also includes a bracket supporting the platform base and a platform swinging structure installed on the bracket. The platform swinging structure and the bracket are both connected to the bottom of the platform base. The platform swinging structure can make the platform base swing 45 degrees left and right.

3. The welding device according to claim 1, characterized in that: It also includes at least one induction heating structure, one end of which is slidably mounted on the platform base, and the other end of which is provided with an induction heating head that is in contact with and connected to the workpiece and is used to heat the workpiece.

4. The welding device according to claim 3, characterized in that: The preheating requirements of the induction heating head are: preheating temperature is 200-300°C, and preheating time is greater than 90 seconds.

5. The welding device according to claim 1, characterized in that: Also included is a shade curtain, which is disposed around the welding device.

6. The welding device according to claim 1, characterized in that: It also includes a preassembly mechanism, which includes an upper and lower lifting structure, a left concentric positioning structure and a right concentric positioning structure. The upper and lower lifting structures are arranged at the lower part to support the middle part of the main shaft, and the left concentric positioning structure and the right concentric positioning structure are respectively located on the left and right sides of the upper and lower lifting structures to ensure the concentricity of the sprocket teeth at both ends.

7. The welding device according to claim 6, characterized in that: The pre-assembly mechanism also includes two manually tightened nuts, which are respectively sleeved on the two ends of the main shaft and located on the outside of each sprocket to complete the assembly of the main shaft and the sprockets at the two ends.

8. The welding device according to claim 6, characterized in that: The left concentric positioning structure includes two cross bars, which are arranged below the sprocket and respectively abut against two tooth positions of the sprocket.

9. The welding device according to claim 6, characterized in that: The right concentric positioning structure includes two cross bars, which are arranged below the sprocket and respectively abut against two tooth positions of the sprocket.

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