An adaptive centering and clamping device for welding of workpieces

Abstract

The application discloses an adaptive centering and pressing device for workpiece welding, which comprises a tool main body mechanism, a servo transmission system, a tool height positioning mechanism, a lead screw transmission mechanism and a centering and pressing mechanism. The tool main body mechanism is connected with a positioner to provide rotary support; the servo transmission system drives the lead screw transmission mechanism; the tool height positioning mechanism temporarily supports the workpiece; the lead screw transmission mechanism is connected with the centering and pressing mechanism to realize automatic centering positioning and pressing. Through cooperation of a servo motor and a speed reducer, the inner circle of the workpiece is automatically positioned, the precision and efficiency are improved; the lead screw transmission mechanism cooperates with the centering and pressing mechanism to ensure accurate centering positioning and reliable pressing of the workpiece. The device realizes automation, reduces manual operation, reduces labor intensity, eliminates safety hazards, improves production efficiency and welding quality, promotes enterprise production automation and intelligentization, and is suitable for various workpieces with inner circles.

Description

Technical Field

[0001] This utility model relates to the field of workpiece welding fixture technology, specifically to an adaptive centering and clamping device for workpiece welding. Background Technology

[0002] In the field of workpiece welding, traditional tooling for workpieces with inner circles, such as vehicle frames, uses manual positioning pins for positioning and manual clamping with pressure plates. However, this positioning method has many drawbacks for different types of workpieces. Manually adjusting the positioning pins is cumbersome, inefficient, and prone to errors, causing the robot to repeatedly seek positioning during welding, severely impacting production progress. Furthermore, manual clamping increases the workload and physical exertion of workers, and poses numerous safety hazards, threatening worker safety. With the development of industrial automation and intelligence, this traditional manual operation method can no longer meet the demands of modern production for high efficiency, precision, and safety. Therefore, developing a device that can automatically center, position, and clamp workpieces is of significant practical importance. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the above-mentioned technical defects and provide an adaptive centering and clamping device for workpiece welding.

[0004] To solve the above-mentioned technical problems, the technical solution provided by this utility model is: an adaptive centering and clamping device for workpiece welding, comprising: a tooling main body mechanism, a servo transmission system, a tooling height positioning mechanism, a lead screw transmission mechanism, and a centering and clamping mechanism;

[0005] The main tooling structure is used to connect with the on-site positioner and provide rotational support;

[0006] The servo transmission system is mounted on the main tooling mechanism and is used to drive the lead screw transmission mechanism;

[0007] The tooling height positioning mechanism is installed on the main body and is used to temporarily support the workpiece;

[0008] The lead screw drive mechanism is connected to the centering and clamping mechanism, enabling the centering and clamping mechanism to achieve automatic centering and clamping of the workpiece, thereby realizing the automatic centering and clamping of the workpiece.

[0009] As a preferred embodiment of this application, the main tooling structure includes a rotary frame, a gearbox, a drive shaft, and a drive gear;

[0010] The gearbox is fixed at the center of the upper surface of the rotary frame;

[0011] The drive shaft is rotatably located inside the gearbox, and the drive gear is mounted on the drive shaft.

[0012] As a preferred embodiment of this application, the servo drive system includes a servo motor, a planetary reducer, a reducer mounting base, and a connecting shaft;

[0013] The servo motor is fixedly connected to the planetary reducer, and the output end of the servo motor is connected to the input end of the planetary reducer. The planetary reducer is fixed below the rotary frame by a reducer mounting base, and the output end of the planetary reducer is connected to the transmission shaft through a connecting shaft.

[0014] As a preferred embodiment of this application, the tooling height positioning mechanism is provided in several groups and is circumferentially distributed above the rotary frame. Each group of tooling height positioning mechanisms includes two height support seats arranged opposite each other, and a pad is installed above the height support seats.

[0015] As a preferred embodiment of this application, the lead screw transmission mechanism is provided in several groups and is circumferentially distributed above the rotary frame;

[0016] Each screw drive mechanism includes a tooling support, a movable slide plate, a connecting block, a sliding seat, a transmission screw, a nut seat, and a driven transmission gear;

[0017] The tooling support is fixed on the rotary frame. There are two tooling supports, which are respectively installed at the two ends above the tooling support. The transmission screw is rotatably connected between the two tooling supports, and the end of the transmission screw extends into the gearbox.

[0018] The driven transmission gear is installed at one end of the transmission screw that extends into the gearbox and meshes with the driving transmission gear for transmission.

[0019] The sliding seat is fixed above the tooling support, and the movable slide plate is slidably disposed above the sliding seat;

[0020] The nut seat is fixed below the movable slide plate and is threadedly engaged with the transmission lead screw.

[0021] As a preferred embodiment of this application, the centering and clamping mechanism includes a connecting seat, a centering shaft, a pressure plate, and a hydraulic cylinder;

[0022] The connecting seat is installed above the mobile skateboard;

[0023] The center axis is provided in two sets and is symmetrically arranged above the connecting seat through mounting parts;

[0024] The hydraulic cylinder is mounted on the connecting seat, and the pressure plate is mounted on the end of the piston rod of the hydraulic cylinder.

[0025] This application offers significant advantages over existing technologies. By utilizing a servo motor and reducer, it achieves automatic centering and positioning of the inner circle of the workpiece frame, eliminating the tedious manual adjustment of positioning pins, greatly improving positioning accuracy and efficiency, and avoiding production delays caused by human error. The lead screw drive mechanism and the centering and clamping mechanism work together to ensure precise centering and reliable clamping of the workpiece, guaranteeing welding quality. The entire process is automated, reducing manual operation, lowering worker labor intensity, eliminating safety hazards associated with manual clamping, significantly improving production efficiency and welding quality, and powerfully promoting the automation and intelligentization of enterprise production. It is suitable for centering and clamping various workpieces with inner circles. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of an adaptive centering and clamping device for workpiece welding according to this application.

[0027] Figure 2 This is a schematic diagram of the installation of the servo drive system of this application;

[0028] Figure 3 This is a schematic diagram of the main structure of the tooling in this application;

[0029] Figure 4 This is a schematic diagram of the servo drive system structure of this application;

[0030] Figure 5 This is a schematic diagram of the tooling height positioning mechanism in this application;

[0031] Figure 6 This is a schematic diagram of the screw drive mechanism of this application;

[0032] Figure 7 This is a schematic diagram of the centering and clamping mechanism of this application.

[0033] As shown in the figure: 01. Main tooling mechanism; 011. Rotary frame; 012. Gearbox; 013. Drive shaft; 014. Drive gear;

[0034] 02. Servo drive system; 021. Servo motor; 022. Servo motor; 023. Gearbox mounting base; 024. Connecting shaft;

[0035] 03. Tooling height positioning mechanism; 031. Height support seat; 032. Pad;

[0036] 04. Screw drive mechanism; 041. Tooling support; 042. Moving slide plate; 043. Connecting block; 044. Sliding seat; 045. Drive screw; 046. Nut seat; 047. Driven gear;

[0037] 05. Centering and clamping mechanism; 051. Connecting seat; 052. Centering shaft; 053. Pressure plate; 054. Hydraulic cylinder. Detailed Implementation

[0038] The present invention will now be described in further detail with reference to the accompanying drawings.

[0039] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. Identical components are indicated by the same reference numerals.

[0040] It should be noted that the terms “front,” “back,” “left,” “right,” “up,” and “down” used in the following description refer to the directions shown in the attached diagram, while the terms “inside” and “outside” refer to the directions toward or away from the geometric center of a specific component, respectively.

[0041] To make the content of this utility model easier to understand, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0042] See attached document Figure 1 -Appendix Figure 7 To solve the above-mentioned technical problems, the technical solution provided by this utility model is: an adaptive centering and clamping device for workpiece welding, comprising: a tooling main body mechanism 01, a servo transmission system 02, a tooling height positioning mechanism 03, a lead screw transmission mechanism 04, and a centering and clamping mechanism 05.

[0043] The tooling main body mechanism 01 is used to connect with the field positioner and provide rotational support. It is the basic architecture for the stable operation of the entire device and provides a reliable physical platform for the installation and collaborative work of other mechanisms.

[0044] The servo transmission system 02 is installed on the tooling main body mechanism 01 and is used to drive the lead screw transmission mechanism 04. Its precise control capability ensures that the lead screw transmission mechanism can move according to the predetermined parameters, providing power guarantee for the precise centering and positioning of the workpiece.

[0045] The tooling height positioning mechanism 03 is installed on the main body mechanism 01 and is used to temporarily support the workpiece. Through the precise height adjustment function, it can adapt to the positioning requirements of workpieces of different specifications in the height direction, and ensure that the initial position of the workpiece before welding is accurate.

[0046] The lead screw drive mechanism 04 is connected to the centering and clamping mechanism 05, enabling the centering and clamping mechanism 05 to realize automatic centering and clamping operation of the workpiece. Its stable transmission performance and precise displacement control are the key links to realize the automated operation of the workpiece.

[0047] The centering and clamping mechanism 05, as an actuating component that directly acts on the workpiece, can accurately center and reliably clamp the workpiece through a reasonable structural design, ensuring the stability of the workpiece's position during the welding process and thus guaranteeing the welding quality.

[0048] The main tooling mechanism 01 serves as the foundational support for the entire device, connecting to the field positioner and providing stable rotational support. Its design fully considers the stability and reliability of the device under different operating conditions. When connecting to the field positioner, a high-precision connection method is employed to ensure that there is no shaking or offset during rotation, providing a solid foundation for the precise operation of the entire device.

[0049] Specifically, the main tooling mechanism 01 includes a rotating frame 011, a gearbox 012, a drive shaft 013, and a drive gear 014. The gearbox 012 is fixed to the center of the upper surface of the rotating frame 011 with high-strength bolts. This fixing method not only ensures the connection strength between the gearbox and the rotating frame but also guarantees the stability and accuracy of the transmission system through precise positioning design. The drive shaft 013 is rotatably mounted inside the gearbox 012 via precision bearings. The use of precision bearings effectively reduces friction during rotation, achieving low-friction, high-efficiency rotation, while also being able to withstand large loads, ensuring that the drive shaft will not wear or deform during long-term operation. The drive gear 014 is mounted on the drive shaft 013 via a key connection. This key connection ensures a secure connection between the drive gear and the drive shaft, enabling precise power transmission and ensuring precise meshing with the driven gear, thereby achieving stable power transmission and precise distribution.

[0050] In one embodiment of this application, the servo transmission system 02 is mounted on the main tooling mechanism 01 and is the core component driving the lead screw transmission mechanism 04 to achieve precise movement. Its selection and design fully consider the working requirements of the device, and it features high precision, high response speed, and high reliability, which can meet the precise control requirements of centering, positioning, and clamping operations for different workpieces.

[0051] Specifically, the servo transmission system 02 includes a servo motor 021, a planetary reducer 022, a reducer mounting base 023, and a connecting shaft 024. The servo motor 021 and the planetary reducer 022 are fixedly connected via a flange. This connection method ensures coaxiality between the two and reduces vibration and errors caused by inaccurate connections. Furthermore, the output end of the servo motor 021 is connected to the input end of the planetary reducer 022 via a coupling. The coupling has good elasticity and compensation capability, absorbing minor deviations between the motor and the reducer, ensuring efficient and smooth power transmission. The planetary reducer 022 is securely fixed to the underside of the rotary frame 011 via the reducer mounting base 023 and bolts. Its output end is connected to the transmission shaft 013 via the connecting shaft 04, achieving precise power transmission. The design of the planetary reducer increases output torque and reduces speed, better adapting to the working requirements of the screw drive mechanism. Simultaneously, its compact structural design saves installation space and improves the overall integration of the device.

[0052] The tooling height positioning mechanism 03 is mounted on the main body mechanism 01 and is mainly used to temporarily support the workpiece and ensure its accurate positioning in the height direction. The design of this mechanism fully considers the height differences of different workpieces, and through flexible adjustment, it can quickly and accurately adapt to the support and positioning needs of various workpieces, thus improving the versatility and applicability of the device.

[0053] Specifically, the tooling height positioning mechanism 03 is provided in several groups (four groups in this embodiment) and circumferentially distributed above the rotary frame 011. This circumferential distribution can evenly support the workpiece and ensure its stability in the horizontal direction. Each group of tooling height positioning mechanisms 03 includes two opposing height support seats 031. The height support seats 031 are made of high-strength materials and have good load-bearing capacity and stability. An adjustable height pad 032 is also installed above the height support seats 031. The height of the pad 032 can be flexibly adjusted through a threaded adjustment mechanism or other precise adjustment methods to adapt to the support and positioning requirements of workpieces of different heights. In actual operation, the operator can quickly and accurately adjust the height of the pad according to the height of the workpiece to place the workpiece at a suitable height position, providing convenience for subsequent centering, positioning and clamping operations.

[0054] In one embodiment of this application, the lead screw drive mechanism 04 is connected to the centering and clamping mechanism 05, and is a key component for realizing automatic centering, positioning, and clamping operations of the workpiece. Its structure is rationally designed, with high transmission accuracy, enabling it to accurately move the centering and clamping mechanism to a designated position, ensuring the centering and positioning accuracy and clamping effect of the workpiece.

[0055] Specifically, the lead screw drive mechanism 04 has several groups (four groups in this embodiment) and is circumferentially distributed above the rotary frame 011. This layout allows for simultaneous centering and positioning of the workpiece from multiple directions, improving the efficiency and accuracy of centering and positioning. Each group of lead screw drive mechanisms 04 includes a tooling support 041, a movable slide plate 042, a connecting block 043, a sliding seat 044, a drive screw 045, a nut seat 046, and a driven drive gear 047.

[0056] The tooling supports 041 are fixed to the rotary frame 011 with high-strength bolts, and one is installed on each side, providing a stable support foundation for the entire screw drive mechanism. The drive screw 045 is rotatably connected between the tooling supports 041 at both ends through precision bearings, ensuring the rotational accuracy and stability of the drive screw. Furthermore, the end of the drive screw 045 extends into the gearbox 012, facilitating connection with the power transmission system.

[0057] Driven gear 047 is installed at one end of the lead screw 045 that extends into the gearbox 012 and meshes with the driving gear 014 to distribute and transmit power. This gear transmission method features accurate transmission ratio and high transmission efficiency, ensuring synchronous movement of multiple lead screw transmission mechanisms, thereby achieving precise centering and positioning of the workpiece. The sliding seat 044 is bolted to the tooling support 041, providing a sliding track for the movable slide plate 042. The sliding seat is designed with high-precision machining to ensure the straightness and smoothness of the sliding track, reducing friction and resistance during sliding. The movable slide plate 042 slides above the sliding seat 044, while the nut seat 046 is fixed below the movable slide plate 042 and threadedly engages with the lead screw 045. When the lead screw rotates, the nut seat reciprocates linearly along the lead screw, thereby driving the movable slide plate to slide on the sliding seat, achieving horizontal movement of the centering and clamping mechanism.

[0058] In one embodiment of this application, the centering and clamping mechanism 05 includes a connecting seat 051, a centering shaft 052, a pressure plate 053, and a hydraulic cylinder 054, and is the final execution component for achieving precise centering and clamping of the workpiece. Its structure is compact, its operation is reliable, and it can be precisely adjusted according to the shape and size of the workpiece, ensuring that the workpiece maintains a stable position throughout the welding process.

[0059] Specifically, the connecting seat 051 is bolted to the top of the movable slide plate 042 to ensure that it moves synchronously with the movable slide plate 042. This connection method is simple and reliable and can accurately transmit the movement of the movable slide plate to other components of the centering and pressing mechanism.

[0060] Two sets of center shafts 052 are symmetrically positioned above the connecting seat 051 via mounting components. These shafts are used to abut against the inner surface of the inner cylindrical workpiece for precise centering. The center shafts are designed with a special shape and material, allowing for a good fit with the inner surface of the workpiece and providing sufficient centering force to ensure the workpiece does not shift during centering. Furthermore, the installation position of the center shafts can be adjusted appropriately according to the workpiece size, improving the adaptability of the device.

[0061] Hydraulic cylinder 054 is mounted on connecting seat 051, with pressure plate 053 installed at the end of its piston rod. This pressure plate is used to perform a clamping operation after the workpiece is aligned, ensuring stability during the welding process. The hydraulic cylinder features high output force and smooth operation, providing appropriate clamping force according to the welding process requirements. The pressure plate is designed with a shape that conforms to the workpiece surface, ensuring uniform pressure application and preventing workpiece deformation due to uneven pressure. In actual operation, after the workpiece is aligned and positioned, the hydraulic cylinder is activated. The piston rod extends, driving the pressure plate downwards to firmly press it against the upper surface of the workpiece, achieving reliable clamping.

[0062] Working principle: In practical applications, the annular workpiece is first placed on the surrounding pads 032. The height of the pads 032 is adjusted to suit the workpiece's requirements. When adjusting the pad height, the operator can use specialized adjustment tools to precisely adjust the pads according to the actual height of the workpiece, ensuring that the workpiece is horizontal in the height direction, providing good initial conditions for subsequent centering and positioning operations.

[0063] When workpiece centering and positioning are required, servo motor 021 is activated. Servo motor 021 drives the transmission shaft 013 and the drive gear 014 to rotate via planetary reducer 022. At startup, the servo motor's internal control system precisely controls its speed and torque according to preset parameters, ensuring the motor can smoothly and quickly reach the set working state. The planetary reducer further reduces the motor's output speed while increasing the output torque, providing sufficient power to the transmission shaft.

[0064] The driving gear 014 meshes with the driven gears 047 in four directions, thereby simultaneously driving the rotation of the transmission screw 045. During gear meshing, the high machining precision of the gears and the use of appropriate lubrication methods ensure the smoothness and accuracy of gear transmission, reducing noise and vibration during transmission. The rotation of the transmission screw 045 drives the four movable slide plates 042 to move linearly through the nut seat 046. When the movable slide plates 042 slide on the sliding seat 044, the high design precision of the sliding seat and the reasonable fit clearance between the movable slide plates and the sliding seat ensure smooth and stable movement of the movable slide plates, enabling them to move accurately along the predetermined trajectory.

[0065] The movable slide plate 042 further drives the connecting seat 051 and the centering shaft 052 to move outward until the centering shaft 052 abuts against the inner surface of the inner cylindrical workpiece, achieving centering and positioning. When the centering shaft abuts against the inner surface of the workpiece, it will be subjected to a reaction force from the workpiece. However, due to the sufficient design strength of the centering shaft and its secure installation, it can withstand this reaction force without deformation or damage. At the same time, the good fit between the centering shaft and the inner surface of the workpiece ensures that the workpiece will not shift during the centering process, achieving accurate centering and positioning.

[0066] Subsequently, hydraulic cylinder 054 is activated. The control system of hydraulic cylinder 054 precisely controls the extension speed and pressure of the piston rod according to preset clamping force parameters. The pressure plate 053 at the output end of hydraulic cylinder 054 presses down onto the upper surface of the workpiece, performing a clamping operation to ensure the workpiece remains stable during welding. During clamping, the pressure plate makes full contact with the upper surface of the workpiece, applying pressure evenly and avoiding workpiece deformation due to excessive local pressure. Simultaneously, the pressure-holding function of the hydraulic cylinder ensures that the pressure plate maintains constant clamping force on the workpiece throughout the welding process, guaranteeing welding quality. The entire process achieves automatic workpiece centering, positioning, and clamping, significantly improving production efficiency and welding quality, reducing errors and labor intensity from manual operation, and providing strong support for the automation and intelligentization of enterprise production.

[0067] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. An adaptive centering and clamping device for workpiece welding, characterized in that, include: The tooling main body (01), servo transmission system (02), tooling height positioning mechanism (03), screw transmission mechanism (04) and centering and clamping mechanism (05); The tooling main body (01) is used to connect with the field positioner and provide rotational support; The servo transmission system (02) is installed on the tooling main body mechanism (01) and is used to drive the lead screw transmission mechanism (04). The tooling height positioning mechanism (03) is installed on the main body mechanism (01) and is used to temporarily support the workpiece; The lead screw drive mechanism (04) is connected to the centering and clamping mechanism (05), enabling the centering and clamping mechanism (05) to realize the automatic centering and clamping operation of the workpiece, thereby realizing the automatic centering and clamping operation of the workpiece.

2. The adaptive centering and clamping device for workpiece welding according to claim 1, characterized in that, The main tooling mechanism (01) includes a rotating frame (011), a gearbox (012), a drive shaft (013), and a drive gear (014). The gearbox (012) is fixed at the center of the upper surface of the rotary frame (011); The drive shaft (013) is rotatably disposed inside the gearbox (012), and the drive gear (014) is mounted on the drive shaft (013).

3. The adaptive centering and clamping device for workpiece welding according to claim 2, characterized in that, The servo drive system (02) includes a servo motor (021), a planetary reducer (022), a reducer mounting base (023), and a connecting shaft (024). The servo motor (021) is fixedly connected to the planetary reducer (022), and the output end of the servo motor (021) is connected to the input end of the planetary reducer (022). The planetary reducer (022) is fixed below the rotary frame (011) through the reducer mounting base (023), and the output end of the planetary reducer (022) is connected to the transmission shaft (013) through the connecting shaft (024).

4. The adaptive centering and clamping device for workpiece welding according to claim 2, characterized in that, The tooling height positioning mechanism (03) is provided in several groups and is circumferentially distributed above the rotary frame (011). Each group of the tooling height positioning mechanism (03) includes two height support seats (031) arranged opposite to each other. A pad (032) is also installed above the height support seat (031).

5. The adaptive centering and clamping device for workpiece welding according to claim 4, characterized in that, The lead screw transmission mechanism (04) is provided in several groups and is distributed circumferentially above the rotary frame (011); Each screw drive mechanism (04) includes a tooling support (041), a movable slide plate (042), a connecting block (043), a sliding seat (044), a drive screw (045), a nut seat (046), and a driven drive gear (047). The tooling support (041) is fixed on the rotary frame (011). There are two tooling supports (041) installed at both ends above the tooling support (041). The transmission screw (045) is rotatably connected between the two tooling supports (041) and the end of the transmission screw (045) extends into the gearbox (012). The driven transmission gear (047) is installed at one end of the transmission screw (045) that extends into the gearbox (012) and meshes with the driving transmission gear (014) for transmission. The sliding seat (044) is fixed above the tooling support (041), and the movable slide plate (042) is slidably disposed above the sliding seat (044); The nut seat (046) is fixed below the movable slide plate (042) and is threadedly engaged with the transmission screw (045).

6. The adaptive centering and clamping device for workpiece welding according to claim 5, characterized in that, The centering and pressing mechanism (05) includes a connecting seat (051), a centering shaft (052), a pressure plate (053), and a hydraulic cylinder (054); The connecting seat (051) is installed above the movable sliding plate (042); The central axis (052) is provided in two sets and is symmetrically arranged above the connecting seat (051) via mounting parts; The hydraulic cylinder (054) is mounted on the connecting seat (051), and the pressure plate (053) is mounted on the piston rod end of the hydraulic cylinder (054).

Images