Pre-tightening force applying auxiliary welding device

Abstract

The invention discloses a pre-tightening force applying auxiliary welding device. The pre-tightening force applying auxiliary welding device is composed of a pre-tightening force applying mechanism and a synchronous rotating mechanism. The pre-tightening force applying mechanism adopts spring buffering and integrates loading and measuring, a spring buffering structure is arranged at the mounting position of a force sensor, the stress concentration problem caused by welding micro-deformation is avoided, and the stability is guaranteed; according to the integrated design, lead screw loading, force sensing and pre-tightening force locking are fused, additional force measuring equipment is not needed, the operation process is simplified, and welding time consumption is shortened. The clamping end of the synchronous rotating mechanism adopts a four-jaw chuck to improve the coaxial precision, the speed and angle of rotation are accurately regulated and controlled by a servo motor, a bearing coupling structure is selected for transmission, pre-tightening force loading and the synchronous rotating function are decoupled, the torque requirement of the motor is reduced, and damage is prevented. By means of the bearing coupling and the high-strength pre-tightening force design, stability is excellent, the risk is small, the device is suitable for welding of small cylindrical elements, and the device has the advantages of being efficient in welding and convenient to carry.

Description

Technical Field

[0001] The invention belongs to the field of mechatronics, and in particular relates to a preload-applying auxiliary welding device. Background Art

[0002] In modern manufacturing, spin welding of small cylindrical components is widely used in advanced sensors, automobiles, aerospace and mechanical equipment, such as pressure sensors, fuel injectors in fuel injection systems, valve connections in cylinder blocks and accelerometers in flight control systems. Spin welding technology is highly favored due to its high efficiency and excellent welding quality. However, small cylindrical components often face challenges such as uneven preload, welding deformation and insufficient joint strength during welding.

[0003] The precise axial application of preload is crucial in the welding process. Appropriate preload can effectively offset the deformation caused by welding and ensure the geometric accuracy and strength of the welded joint. Traditional welding methods mainly rely on optimizing welding process parameters such as welding speed and heat input, but these methods cannot effectively solve the problem of quantitative control of preload application. The lack of accurate preload application means can easily lead to welding deformation, which in turn affects the welding quality.

[0004] Taking piezoelectric pressure sensors as an example, the application of prestress is the key to ensuring good contact between piezoelectric elements and other elements. Appropriate prestress can eliminate the gap between components, thereby improving the response speed and stability of the sensor. However, the application of prestress must be precisely controlled. Excessive prestress may cause damage to the piezoelectric element and affect the performance of the sensor. Therefore, accurate measurement and control of the applied prestress is crucial to correcting the characteristic curve of the sensor. Although there are devices for applying prestress and rotary welding equipment, there is no integrated device that can simultaneously achieve prestress application and rotary welding. This gap limits the quality and efficiency of welding.

[0005] From the above analysis, it can be seen that designing an auxiliary device that can achieve quantitative and accurate application of preload and synchronous rotation is the key to improving the welding quality and efficiency of small cylindrical components. The device should not only have a high-precision preload application function, but also be synchronized with the welding process to ensure that the optimal preload state is always maintained during the welding process, thereby effectively preventing welding deformation and improving the overall strength and stability of the structure.

[0006] The present invention proposes a novel preload auxiliary device for assisting the welding of small cylindrical components. The device not only overcomes the problems of cracks and deformation caused by the difficulty of synchronous rotation of small cylindrical components in traditional welding methods, but also improves the problem of the difficulty of accurately controlling the preload in traditional methods. By accurately applying the preload, the strength and stability of the welding part can be greatly improved, welding defects can be reduced, and the welding quality can be improved. At the same time, the device can be adjusted according to different welding requirements and has a wide range of applicability. Summary of the invention

[0007] The technology of the present invention solves the problem: a preload force applying auxiliary welding device is designed. The traditional auxiliary welding device has poor stability, low coaxiality, is relatively bulky, and requires additional force sensing equipment. And its preload force loading function and synchronous rotation function are coupled with each other, resulting in a higher risk of damage to the motor under high load conditions. Taking small cylindrical components as the object, a preload force applying auxiliary welding device is designed. Through the design of spring buffer structure, integrated design of preload force measurement and preload force applying structure, and bearing coupling structure design, the goal of reducing stress concentration during welding and accurately applying preload force is achieved; and the preload force loading function and the synchronous rotation function are decoupled to achieve good speed control under preload force loading and avoid the risk of motor damage.

[0008] In order to achieve the above object, the technical solution of the present invention is as follows:

[0009] The present invention discloses a preload force applying auxiliary welding device, comprising a preload force applying mechanism (1), a synchronous rotating mechanism (2) and a rotating hand wheel (3). The preload force applying mechanism (1) realizes preload force loading by rotating the hand wheel (3).

[0010] The preload force applying mechanism (1) mainly includes: a rotating hand wheel (3), a spring buffer structure (4), a force sensor (5), a sliding platform (6), a sliding guide rail (7), a ball screw (8) and a mounting hole (9). The design mainly adopts an integrated design of a spring buffer structure (4) and a force sensor (5). In order to prevent the stress concentration problem caused by slight deformation during welding, the installation position of the force sensor (5) in the preload force applying mechanism (1) adopts the design method of a spring buffer structure (4), thereby ensuring the stability of the preload force application. In the preload force applying mechanism (1), the connection between the rotating hand wheel (3) and the ball screw (8) is designed as a loading structure. The operator can easily drive the ball screw (8) by rotating the hand wheel (3), thereby enabling the sliding platform (6) to achieve relative movement on the sliding guide rail (7). At the same time, the operator can read the value of the force sensor (5) in real time to select a suitable preload force for application. In order to facilitate the installation of the device on the welding platform, multiple mounting holes (9) are designed on both sides of the preload force applying mechanism (1).

[0011] The synchronous rotation mechanism (2) mainly includes a servo motor (10), a coupling (11), a bearing (12), a four-jaw chuck (13) and a small cylindrical element (14). The function is to realize the rotation welding of the small cylindrical element (14) after the preload force is applied. In order to improve the coaxiality of the small cylindrical elements (14) at both ends, the clamping part of the synchronous rotation mechanism (2) adopts a four-jaw chuck (13) structure. The rotating part is provided with high-precision control by the servo motor (10), and the rotation speed and angle can be adjusted as needed to adapt to different application requirements. The synchronous rotation mechanism (2) adopts a bearing (12) and a coupling (11) structure in the transmission part to replace the traditional simple coupling. By introducing the bearing (12), the design realizes the decoupling of the preload force loading function and the synchronous rotation function, avoiding the servo motor (10) from directly bearing the load in the axial direction, thereby reducing the torque requirement during the rotation process. This improvement not only improves the overall performance of the system, but also significantly reduces the risk of damage to the servo motor (10) under high load conditions. The device can be used as an auxiliary welding device for applying pre-tightening force to small cylindrical components.

[0012] Principle of the present invention: The present invention mainly includes three parts: a preload applying mechanism (1), a synchronous rotation mechanism (2) and a rotating hand wheel (3). The preload applying mechanism (1) is intended to realize the preload loading during the welding process to ensure the stability and strength of the welding. The function of the synchronous rotation mechanism (2) is to realize the precise rotation welding of the cylindrical small element (14), while the rotating hand wheel (3) is used for the operator to manually control the preload. In order to achieve a good connection between the synchronous rotation mechanism (2) and the cylindrical small element (14) and the self-centering clamping of the cylindrical small element (14), the two cylindrical small elements (14) are first placed in the four-jaw chuck (13) and tightened during welding, thereby ensuring the coaxiality of the two cylindrical small elements (14) in the synchronous rotation mechanism (2). Then, the rotating hand wheel (3) is slowly rotated to drive the sliding platform (6) to translate on the sliding guide rail (7) through the ball screw (8), so that the two cylindrical small components (14) in the synchronous rotating mechanism (2) generate preload force, and the preload force is measured in real time through the force sensor (5). After the force sensor (5) shows that the preload force is the target value, the device is placed on the welding table and fixed using the mounting hole (9), and the servo motor (10) in the synchronous rotating mechanism (2) is driven through the coupling (11) and the bearing (12) to the four-claw chuck (13), so as to realize the synchronous rotation welding of the cylindrical component (14) after the preload force is quantitatively applied. The speed and rotation angle of the synchronous rotating mechanism (2) can be determined according to the welding requirements of the cylindrical small components (14).

[0013] The advantages of the present invention compared with the prior art are:

[0014] (1) Since the preload force applying mechanism (1) adopts a spring buffer structure (4) and realizes an integrated design with the force sensor (5), compared with the traditional direct application structure, the stability of the device is greatly improved, the accurate application of the preload force of the component to be welded is realized, the operation steps are reduced, and the welding time is shortened;

[0015] (2) The coupling (11) and bearing (12) of the synchronous rotation mechanism (2) are designed with a bearing coupling structure, which realizes the decoupling of the preload loading function and the synchronous rotation function, structurally avoids the servo motor (10) from directly bearing the axial load, reduces the torque requirement of the servo motor (10) during the rotation process, and ensures the reliability of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The figure is a schematic assembly diagram of a preload-applying auxiliary welding device of the present invention. Figure 2 is a schematic diagram of a preload force applying mechanism (1); Figure 3 It is a schematic diagram of the synchronous rotating mechanism (2).

[0017] The meanings of the reference numerals in the figure are:

[0018] 1 is a preload force applying mechanism, 2 is a synchronous rotating mechanism, 3 is a rotating hand wheel, 4 is a spring buffer mechanism, 5 is a force sensor, 6 is a sliding platform, 7 is a sliding guide rail, 8 is a ball screw, 9 is a mounting hole, 10 is a servo motor, 11 is a coupling, 12 is a bearing, 13 is a four-jaw chuck, and 14 is a small cylindrical component. DETAILED DESCRIPTION

[0019] A preload force applying auxiliary welding device of the present invention will be further described below in conjunction with the accompanying drawings.

[0020] The device structure diagram is as follows Figure 1 , Figure 2 and Figure 3As shown. The present invention mainly includes three parts: a preload applying mechanism (1), a new synchronous rotation mechanism (2) and a rotating hand wheel (3). The preload applying mechanism (1) is intended to realize the preload loading during the welding process to ensure the stability and strength of the welding. The function of the synchronous rotation mechanism (2) is to realize the precise rotation welding of the cylindrical small element (14), while the rotating hand wheel (3) is used for the operator to manually control the preload. In order to achieve a good connection between the synchronous rotation mechanism (2) and the cylindrical small element (14) and the self-centering clamping of the cylindrical small element (14), during welding, the two cylindrical small elements (14) are first placed in the four-jaw chuck (13) respectively and tightened and fixed, thereby ensuring the coaxiality of the two cylindrical small elements (14) in the synchronous rotation mechanism (2). Then, the rotating hand wheel (3) is slowly rotated to drive the sliding platform (6) to translate on the sliding guide rail (7) through the ball screw (8), so that the two cylindrical small components (14) in the synchronous rotating mechanism (2) generate preload force, and the preload force is measured in real time through the force sensor (5). After the force sensor (5) shows that the preload force is the target value, the device is placed on the welding table and fixed using the mounting hole (9), and the servo motor (10) in the synchronous rotating mechanism (2) is driven through the coupling (11) and the bearing (12) to the four-claw chuck (13), so as to realize the synchronous rotation welding of the cylindrical component (14) after the preload force is quantitatively applied. The speed and rotation angle of the synchronous rotating mechanism (2) can be determined according to the welding requirements of the cylindrical small components (14).

[0021] It can be seen that the device not only has the characteristics of compact structure, convenient operation, accurate application of preload and synchronous rotation. At the same time, due to the integrated structural design, spring buffer structure (4) and bearing coupling structure, stress concentration in the traditional preload application is avoided and the operation time required for rotation welding is reduced, the decoupling of the preload loading function and the synchronous rotation function is achieved, and the servo motor (10) is avoided from directly bearing the load in the axial direction, which significantly reduces the risk of damage to the servo motor (10) under high load conditions.

[0022] The device not only overcomes the problem of quantitative application of preload during welding, but also improves the problem that synchronous rotary welding is difficult to bear large loads and has low coaxiality. It is a good auxiliary device, especially for the rotary welding of cylindrical objects.

Claims

1. A preload force auxiliary welding device, characterized in that: include: The preload force applying mechanism (1), the synchronous rotating mechanism (2) and the rotating hand wheel (3) are composed of three parts. The preload force applying mechanism (1) realizes the preload force loading through the hand wheel (3). The preload force applying mechanism (1) mainly includes a rotating hand wheel (3), a spring buffer structure (4), a force sensor (5), a sliding platform (6), a sliding guide rail (7), a ball screw (8) and a mounting hole (9). The design mainly adopts an integrated design of a spring buffer structure (4) and a force sensor (5). In order to prevent the problem of stress concentration during welding, the installation position of the force sensor (5) in the preload force applying mechanism (1) adopts the design method of a spring buffer structure (4), thereby ensuring the stability of the preload force application. In the preload force applying mechanism (1), the connection between the rotating hand wheel (3) and the ball screw (8) is designed as a loading structure. The operator can drive the ball screw (8) by rotating the hand wheel (3), thereby enabling the sliding platform (6) to achieve relative movement on the sliding guide rail (7). At the same time, the rotating hand wheel (3) has a locking function, which can realize the locking of the preload force, thereby ensuring that the applied preload force remains stable during operation. The force sensor (5) can read the value in real time to select a suitable preload force for application. A plurality of mounting holes (9) are designed on both sides of the preload force applying mechanism (1) to facilitate stable fixing on the welding table. The synchronous rotating mechanism (2) mainly includes a servo motor (10), a coupling (11), a bearing (12), a four-jaw chuck (13) and a small cylindrical element (14). The function is to realize the rotation welding of the small cylindrical element (14) after the preload force is applied. In order to improve the coaxiality of the small cylindrical elements (14) at both ends, the clamping part of the synchronous rotating mechanism (2) adopts a four-jaw chuck (13) structure. The rotating part adopts a servo motor (10) to provide high-precision control, and can adjust the rotation speed and angle according to needs, which is suitable for different application requirements. The synchronous rotating mechanism (2) adopts a bearing (12) coupling (11) structure in the transmission part to replace the traditional simple coupling structure. By introducing the bearing (12), the design realizes the decoupling of the preload loading function and the synchronous rotation function, effectively avoiding the servo motor (10) from directly bearing the load in the axial direction, thereby reducing the torque requirement during the rotation process and significantly reducing the risk of damage to the servo motor (10) under high load conditions.

2. A preload force applying auxiliary welding device according to claim 1, characterized in that: The installation position of the force sensor (5) in the preload force applying mechanism (1) adopts the design mode of a spring buffer structure (4), thereby realizing the integration of the spring buffer structure (4) and the force sensor (5). At the same time, the rotating hand wheel (3) has a locking function, which can realize the locking of the preload force, thereby ensuring that the applied preload force remains stable during the operation.

3. The preload force applying auxiliary welding device according to claim 1, characterized in that: The synchronous rotation mechanism (2) adopts a bearing (12) coupling (11) structure in the transmission part. By introducing the bearing (12), the preload loading function and the synchronous rotation function are decoupled, the servo motor (10) is prevented from directly bearing the load in the axial direction, and the risk of damage to the servo motor (10) under high load conditions is reduced.

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