Coaxial center servo riveter

Abstract

Coaxial servo spin riveter, relate to spin riveter technical field, including shell, the inside of shell is installed with rotation connection main shaft, the bottom of main shaft is fixedly installed with spin riveting head mounting seat, the bottom of spin riveting head mounting seat is installed with spin riveting head, the one end of main shaft in shell inside is installed with main shaft gear, the lower end of one side of shell is equipped with integral molding transmission seat, the upper end of transmission seat is fixedly installed with servo motor, and servo motor transmits rotary drive force to main shaft on shell side surface, the top of shell is fixedly installed with lifting cylinder through screw, the top of lifting cylinder is installed with lifting cylinder drive device, the top of main shaft is installed with bearing joint, the scheme solves the problem that the existing servo spin riveter exists that the sliding block riveting shakes, and the workpiece thickness and pressure cannot be monitored in real time.

Description

Technical Field

[0001] This utility model relates to the field of riveting machine technology, specifically a coaxial servo riveting machine. Background Technology

[0002] A riveting machine is a specialized piece of machinery that uses a motor or hydraulic system to drive the rivet head to rotate at high speed and apply axial pressure. This process involves cold plastic deformation of the rivet (such as a solid rivet or a semi-hollow rivet) and the workpiece to be joined (mostly metal components, but some can be adapted to non-metallic materials), thereby achieving a tight and secure connection between the two. It is widely used in automobile manufacturing, aerospace, electronics, hardware tools, and other fields. It features high connection strength, no surface damage, fast processing efficiency, and relatively simple operation. It can meet the riveting needs of workpieces of different thicknesses and materials and is one of the important pieces of equipment in modern manufacturing that replaces traditional stamping riveting and welding processes.

[0003] For example, the Chinese authorized patent CN208303768U, entitled "A riveting machine", includes a base, a frame mounted on the base, a motor, a cylinder, a transmission rod, and a controller. The motor is mounted on the frame, one end of the cylinder is connected to the motor, and the other end is connected to the upper end of the transmission rod. The controller is mounted on one side of the frame and is electrically connected to the motor and the cylinder. A riveting head is connected to the lower end of the transmission rod, and a riveting seat is correspondingly mounted below the riveting head. The workpiece is placed on the riveting seat, and the motor and cylinder drive the transmission rod to drive the riveting head to rivet the workpiece.

[0004] While existing technologies can achieve basic riveting functions, they lack functionality or are insufficient in areas such as pre-riveting defect screening, real-time monitoring of the riveting process, and height monitoring of special components (such as shims). Either they cannot detect the initial height of the workpiece before riveting to screen out defective parts, leading to wasted riveting operations, or they cannot monitor pressure changes in real time during the riveting process, making it difficult to ensure the stability of riveting quality. Furthermore, for scenarios requiring shim-assisted riveting, there is a lack of effective shim height monitoring methods, further limiting the applicability and processing reliability of the equipment. Therefore, they do not meet current needs. To address this, we propose a coaxial servo riveting machine. Utility Model Content

[0005] The purpose of this invention is to provide a coaxial servo riveting machine to solve the problems of slider riveting wobbling and the inability to monitor workpiece thickness and pressure in real time in existing servo riveting machines mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a coaxial servo riveting machine, comprising a housing, a rotatably connected spindle installed inside the housing, a riveting head mounting seat fixedly installed at the bottom of the spindle, a riveting head mounted at the bottom of the riveting head mounting seat, a spindle gear mounted at one end of the spindle inside the housing, a transmission seat integrally formed therewith at the lower end of one side of the housing, a servo motor fixedly installed at the upper end of the transmission seat, and the servo motor transmitting rotational driving force to the spindle from the side of the housing, a lifting cylinder fixedly installed at the top of the housing by screws, a lifting cylinder drive device installed at the top of the lifting cylinder, and a bearing joint installed at the top of the spindle.

[0007] Preferably, a drive gear is rotatably mounted on one side inside the transmission base, and the output shaft of the servo motor is connected to the drive gear. A transmission gear is rotatably mounted at the middle position inside the transmission base, and the transmission gear is meshed with the drive gear and the main shaft gear respectively.

[0008] Preferably, a laser rangefinder is installed on one side of the bottom of the housing to detect the distance between the riveting head and the workpiece in the initial state. The signal output terminal of the laser rangefinder is connected to a microcontroller, and the output terminal of the microcontroller is connected to an early warning device.

[0009] Preferably, the upper end of the bearing joint is provided with a pressure detection mechanism, which includes a first connector and a second connector. The first connector is fixed to the shaft at the upper end of the bearing joint, and a limiting groove is provided on the outer wall of the first connector. The second connector is fixedly installed on the movable end of the lifting cylinder, and a limiting protrusion is provided on the second connector, which slides and limits the movement of the limiting protrusion and the limiting groove.

[0010] Preferably, the second connector has a detection cavity inside, and a pressure sensor is fixedly installed inside the detection cavity. The lower end of the pressure sensor has a detection block that is slidably connected to the detection cavity, and the detection block is aligned with the top end of the first connector.

[0011] Preferably, the signal output terminal of the pressure sensor is connected to a microcontroller, and the output terminal of the microcontroller is connected to the lifting cylinder drive device.

[0012] Preferably, the main shaft and the axis of the lifting cylinder are on the same vertical line.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. The rotating shaft and the vertical moving shaft of this utility model are designed to be coaxial, which eliminates the motion offset and shaking problems that are prone to occur in non-coaxial layouts from the core structural level of the equipment. This design ensures that the rotational power of the rotating shaft and the feed action of the vertical moving shaft are always on the same axial trajectory, making the movement of the actuator more stable and precise during the riveting process. It ensures that the riveting tool can always be accurately aligned with the riveting point of the workpiece, avoids uneven force on the riveting part caused by structural deviation, reduces damage to the workpiece caused by misalignment and shaking, and greatly improves the stability and reliability of the equipment in long-term operation, thus extending the service life of the equipment.

[0015] 2. The pressure detection function of this utility model provides real-time quality monitoring and assurance for the riveting process. During the riveting operation, the pressure detection module can continuously sense and capture the dynamic changes in riveting pressure. Once it is found that the pressure exceeds the preset reasonable range, such as the workpiece deformation or over-riveting that may be caused by a sudden increase in pressure, or the weak riveting that may be caused by insufficient pressure, the abnormal signal can be fed back to the control unit in time. The control unit can then quickly adjust the riveting parameters or stop the operation to avoid the production of defective products. This real-time monitoring mechanism effectively avoids quality fluctuations caused by uncontrolled pressure, ensures that the riveting quality of each workpiece is consistent, and improves the overall yield rate of production.

[0016] 3. Before the workpiece enters the formal riveting process, the height detection module of this utility model will conduct a comprehensive inspection of the height status of the workpiece, accurately identify workpieces whose height does not meet the standard, and prevent them from entering the subsequent riveting process and causing invalid processing by screening out these unqualified workpieces in advance. This reduces the material loss and energy waste caused by riveting defective workpieces, and also saves the subsequent rework or scrapping process for defective riveted parts, laying the foundation for subsequent accurate riveting. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present utility model;

[0018] Figure 2 This is a rear view of the present invention;

[0019] Figure 3 This is a schematic diagram of the internal structure of the present invention;

[0020] Figure 4 For the present utility model Figure 3 Enlarged view of a portion of region A in the middle.

[0021] In the diagram: 1. Housing; 2. Spindle; 3. Spindle gear; 4. Riveting head mounting base; 5. Riveting head; 6. Transmission base; 7. Servo motor; 8. Transmission gear; 9. Bearing joint; 10. Pressure detection mechanism; 11. Lifting cylinder; 12. Lifting cylinder drive device; 13. Laser rangefinder sensor; 14. Drive gear; 15. First connector; 16. Second connector; 17. Limiting groove; 18. Limiting protrusion ring; 19. Detection cavity; 20. Pressure sensor; 21. Detection block. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Please see Figure 1-4 An embodiment of this utility model provides a coaxial servo riveting machine, including a housing 1, a rotatably connected spindle 2 installed inside the housing 1, a riveting head mounting seat 4 fixedly installed at the bottom of the spindle 2, a riveting head 5 installed at the bottom of the riveting head mounting seat 4, a spindle gear 3 installed at one end of the spindle 2 inside the housing 1, a transmission seat 6 integrally formed with the lower end of one side of the housing 1, a servo motor 7 fixedly installed at the upper end of the transmission seat 6, and the servo motor 7 transmits rotational driving force to the spindle 2 from the side of the housing 1, a lifting cylinder 11 fixedly installed at the top of the housing 1 by screws, a lifting cylinder drive device 12 installed at the top of the lifting cylinder 11, a bearing joint 9 installed at the top of the spindle 2, a drive gear 14 rotatably installed on one side inside the transmission seat 6, and the output shaft of the servo motor 7 is connected to the drive gear 14, and a transmission gear 8 rotatably installed at the middle position inside the transmission seat 6, and the transmission gear 8 meshes with the drive gear 14 and the spindle gear 3 respectively.

[0024] The servo motor 7 drives the spindle gear 3 to rotate via the drive gear 14 and transmission gear 8, which in turn drives the spindle 2 to rotate. Simultaneously, the lifting cylinder, under the action of the drive device, lifts the spindle 2 and the riveting head 5 as a whole, realizing the riveting action. The integrated power transmission and lifting structure makes the equipment operation more compact, reduces power loss, and improves the operation response speed.

[0025] Please see Figure 1A laser rangefinder 13 is installed on one side of the bottom of the outer casing 1 to detect the distance between the riveting head 5 and the workpiece in the initial state. The signal output terminal of the laser rangefinder 13 is connected to a microcontroller, and the output terminal of the microcontroller is connected to an early warning device. Before riveting, the laser rangefinder 13 emits a laser to the surface of the workpiece, calculates the initial distance between the riveting head 5 and the workpiece by calculating the laser reflection time, and transmits the distance data to the microcontroller. The microcontroller compares the distance with a preset standard range, and if it exceeds the range, it controls the early warning device to issue an alarm. This process screens out workpieces with unqualified heights in advance, avoids invalid riveting operations, reduces material and energy waste, and reminds operators to handle abnormalities in a timely manner, ensuring the accuracy of subsequent processing.

[0026] Please see Figure 3 and Figure 4 The upper end of the bearing joint 9 is equipped with a pressure detection mechanism 10, which includes a first connector 15 and a second connector 16. The first connector 15 is fixed to the shaft at the upper end of the bearing joint 9, and a limiting groove 17 is provided on the outer wall of the first connector 15. The second connector 16 is fixedly installed on the movable end of the lifting cylinder 11, and a limiting protrusion 18 is fixedly provided on the second connector 16. The limiting protrusion 18 slides and limits the movement of the second connector 16 with the lifting cylinder 11, and the limiting protrusion 18 slides in the limiting groove 17. This allows for relative lifting and lowering of the two while limiting radial displacement, ensuring that the pressure detection mechanism 10 can still work stably when the main shaft 2 rotates. The limiting structure ensures the stability and accuracy of pressure detection, avoids the radial shaking caused by the rotation of the main shaft 2 from affecting the accuracy of pressure detection, and provides a reliable foundation for subsequent pressure monitoring.

[0027] Please see Figure 4 The second connector 16 has a detection chamber 19 inside, and a pressure sensor 20 is fixedly installed inside the detection chamber 19. A detection block 21, which is slidably connected to the detection chamber 19, is located at the lower end of the pressure sensor 20 and is aligned with the top of the first connector 15. The signal output of the pressure sensor 20 is connected to a microcontroller, and the output of the microcontroller is connected to the lifting cylinder drive device 12. During riveting, the first connector 15 descends with the spindle 2 and contacts the detection block 21, transmitting the riveting force to the pressure sensor 20. The pressure sensor 20 converts the pressure signal into an electrical signal and transmits it to the microcontroller. The microcontroller compares the pressure to a preset range; if the pressure exceeds the range, it controls the lifting cylinder drive device 12 to adjust the output force of the lifting cylinder 11 or stop its operation. Real-time monitoring and dynamic adjustment of the riveting pressure prevents excessive pressure from causing workpiece deformation or insufficient pressure from causing weak riveting, ensuring that the riveting strength of each workpiece meets the standard and improving product quality stability.

[0028] Please see Figure 3The axes of the main shaft 2 and the lifting cylinder 11 are on the same vertical line, and the rotation center of the main shaft 2 is on the same straight line as the driving force direction of the lifting cylinder 11. This ensures that the axial force applied by the lifting cylinder 11 can be fully applied to the main shaft 2 and the riveting head 5, and that no additional radial eccentric force is generated when the main shaft 2 rotates. Structurally, this eliminates the force offset and wobbling caused by the non-coaxial design, ensuring that the riveting head 5 is always accurately aligned with the riveting position during lifting and rotation, reducing damage to the workpiece caused by positioning deviation, and improving the stability of equipment operation and riveting accuracy.

[0029] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A coaxial servo riveting machine, comprising a housing (1), characterized in that: The main shaft (2) is rotatably connected inside the housing (1). A riveting head mounting seat (4) is fixedly installed at the bottom of the main shaft (2). A riveting head (5) is installed at the bottom of the riveting head mounting seat (4). A main shaft gear (3) is installed at one end of the main shaft (2) inside the housing (1). A transmission seat (6) integrally formed with the main shaft (1) is provided at the lower end of one side of the housing (1). A servo motor (7) is fixedly installed at the upper end of the transmission seat (6). The servo motor (7) transmits the rotational driving force to the main shaft (2) from the side of the housing (1). A lifting cylinder (11) is fixedly installed at the top of the housing (1) by screws. A lifting cylinder drive device (12) is installed at the top of the lifting cylinder (11). A bearing joint (9) is installed at the top of the main shaft (2).

2. The coaxial servo riveting machine according to claim 1, characterized in that: A drive gear (14) is rotatably mounted on one side inside the transmission seat (6), and the output shaft of the servo motor (7) is connected to the drive gear (14). A transmission gear (8) is rotatably mounted in the middle position inside the transmission seat (6), and the transmission gear (8) is meshed with the drive gear (14) and the main shaft gear (3) respectively.

3. The coaxial servo riveting machine according to claim 1, characterized in that: A laser rangefinder (13) is installed on one side of the bottom of the housing (1) to detect the distance between the riveting head (5) and the workpiece in the initial state. The signal output terminal of the laser rangefinder (13) is connected to the microcontroller, and the output terminal of the microcontroller is connected to an early warning device.

4. The coaxial servo riveting machine according to claim 1, characterized in that: The upper end of the bearing joint (9) is provided with a pressure detection mechanism (10). The pressure detection mechanism (10) includes a first connector (15) and a second connector (16). The first connector (15) is fixed to the shaft at the upper end of the bearing joint (9). The outer wall of the first connector (15) is provided with a limiting groove (17). The second connector (16) is fixedly installed on the movable end of the lifting cylinder (11). The second connector (16) is fixedly provided with a limiting protrusion ring (18), and the limiting protrusion ring (18) slides and limits the limiting groove (17).

5. The coaxial servo riveting machine according to claim 4, characterized in that: The second connector (16) has a detection cavity (19) inside, and a pressure sensor (20) is fixedly installed inside the detection cavity (19). The lower end of the pressure sensor (20) is provided with a detection block (21) that is slidably connected to the detection cavity (19), and the detection block (21) is aligned with the top end of the first connector (15).

6. The coaxial servo riveting machine according to claim 5, characterized in that: The signal output terminal of the pressure sensor (20) is connected to the microcontroller, and the output terminal of the microcontroller is connected to the lifting cylinder drive device (12).

7. The coaxial servo riveting machine according to claim 1, characterized in that: The axis of the main shaft (2) and the lifting cylinder (11) are on the same vertical line.

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