Lightweight handheld electric rivet gun

Abstract

The application relates to the technical field of industrial manufacturing, and discloses a light-weight handheld electric pull-riveting gun, in order to solve the problems of limited operation space and large airflow noise caused by pneumatic energy supply, the rotation of a pull-riveting head is powered by a frameless motor, thereby completing the up-and-down rivet action, the left-and-right movement of the pull-riveting head is powered by a servo motor, thereby realizing the pull-riveting action, therefore, when the rivet is installed, power supply can be realized by using a storage battery, the application of an air pump is not needed, the pull-riveting gun has a compact structure, impact sound and high-speed airflow friction sound caused by gas compression and release are avoided, the noise level during operation can be greatly reduced, and finally, the motor energy supply makes the pull-riveting gun not limited by a use scene and has the advantages of small noise.

Description

Technical Field

[0001] This invention relates to the field of industrial manufacturing technology, and in particular to a lightweight handheld electric rivet gun. Background Technology

[0002] Riveting is a widely used cold joining technique, primarily used to securely connect two or more metal sheets together. In this system, rivet nuts (also known as rivet caps or rivet heads) play a crucial role, being widely used in fastening operations in the manufacturing of various metal sheets and pipes. The advantage of rivet nuts is that no pre-tapping of internal threads is required during the riveting process, which simplifies the operation and ensures the strength and reliability of the connection.

[0003] In the aerospace field, which demands extremely stringent requirements for material properties and manufacturing processes, aluminum alloys are widely used in the manufacture of critical structural components such as aircraft fuselages, wings, and engine nacelles due to their advantages such as low density, high specific strength, good corrosion resistance, and processability. However, welding aerospace-grade aluminum alloys presents numerous challenges, as their weldability is relatively poor, and defects such as cracks and bubbles are easily generated during welding. Cracks severely weaken the strength of the welded joint, potentially leading to premature structural failure under complex loads during aircraft flight; while bubbles create stress concentration points within the material, reducing the fatigue life of the structure and threatening flight safety. Therefore, to ensure the connection strength and reliability of aerospace structural components, riveting has gradually become a commonly used connection method in this field. Riveting tightly connects two or more parts together using rivets, eliminating the need for high-temperature melting of materials like welding, thus avoiding many problems associated with welding and effectively ensuring the integrity and stability of the connection. However, currently, the tools used to install rivet nuts are mainly pneumatic-hydraulic rivet guns, which have revealed some significant problems in practical use. First, pneumatic hydraulic riveting guns generate significant noise during operation, posing a potential threat to the operator's hearing and potentially disrupting the surrounding work environment. Furthermore, their use may be limited by location constraints, requiring a stable air supply and sufficient operating space. Second, oil leaks and dirt accumulation are also major concerns, proving difficult to clean and potentially negatively impacting the working environment and product quality. These issues collectively limit the application of pneumatic hydraulic riveting guns in modern industrial automotive sectors and in automated and intelligent equipment. Summary of the Invention

[0004] This invention proposes a lightweight handheld electric riveting gun that has the advantage of being powered by an electric motor, thereby solving the problems of limited operating space and high airflow noise caused by pneumatic power supply mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a lightweight handheld electric rivet gun, comprising: a rivet housing, inside which are installed a servo motor and a frameless motor controlled by a rivet switch assembly; a nut assembly is rotated on the output shaft of the servo motor via a reduction gearbox, and a ball screw is threadedly connected to the inner side of the nut assembly, reciprocating left and right along the inner side of the rivet housing; a rivet spindle is movably mounted inside the ball screw, and a rivet head is movably mounted at the end of the rivet spindle; a frameless motor is fixedly mounted inside the rivet housing and movably mounted to the rivet spindle, and the rotor of the frameless motor is movably mounted to the rivet spindle; the frameless motor drives the rivet spindle to rotate the rivet head, thereby screwing the rivet head into / out of the nut rivet; the servo motor, based on the transmission of the nut assembly and the ball screw, realizes the axial pulling of the rivet head on the nut rivet.

[0006] Furthermore, a holster is threadedly connected to the end of the rivet housing, and a pull rod guide sleeve for positioning and guiding the rivet head is threadedly connected to the end of the holster.

[0007] Furthermore, symmetrical limit grooves are provided on the side of the riveting spindle, and quick-release heads that are pushed outward by springs are symmetrically installed on the outer side of the riveting head.

[0008] Furthermore, a pressure plate that is pushed outward by a spring is movably installed inside the riveting spindle.

[0009] Furthermore, a core-pulling rivet rod is installed inside the rivet spindle, a pressure-boosting sleeve is installed inside the gun sleeve, and pressure-boosting top rods are symmetrically and movably installed on the outside of the rivet spindle. Springs are installed between the two pressure-boosting top rods and the core-pulling rivet rod. A core-pulling cavity is opened inside the rivet head, and an installation groove is opened on the side of the rivet head. A positioning bearing bracket is movably installed inside the pull rod directional sleeve, and a rivet clamp is fixedly installed at the outer end of the core-pulling rivet rod. The core shaft of the core-pulling rivet can be fixed by using the rivet clamp.

[0010] Furthermore, the inner side of the booster sleeve has two inner walls with different inner diameters, which are transitioned by a slope.

[0011] Furthermore, an electrical slip ring assembly is movably installed inside the holster, and electrical contact switches are correspondingly installed at the two ends of the riveted spindle located in the limiting groove.

[0012] The present invention has the following beneficial effects:

[0013] The present invention provides a lightweight handheld electric rivet gun, which can bring a series of outstanding effects when assembling aluminum forgings for aerospace applications.

[0014] In terms of noise reduction, the rivet gun uses a frameless motor as its core power source. Compared to traditional power units, the frameless motor has a more compact structure and operates more smoothly. This motor directly drives the rivet head to rotate, a design that cleverly simplifies the power transmission path and reduces additional noise caused by friction and collision of mechanical transmission components. During the riveting process, the rivet head can smoothly achieve the initial positioning and preparation of the upper and lower rivets, and the entire process is quiet and efficient. At the same time, in order to complete the key action of riveting, namely the left and right movement of the rivet head to clamp and break the rivet, this product introduces a servo motor. The servo motor has high-precision control capabilities and stable operating characteristics. It can accurately control the movement speed and force of the rivet head, avoiding noise caused by unstable movement. Moreover, the application of the servo motor not only ensures the smoothness and accuracy of the riveting action, but also greatly improves work efficiency and riveting quality, reducing additional noise caused by operational errors or equipment instability from the source.

[0015] More importantly, the electric rivet gun completely eliminates the air pump required by traditional pneumatic rivet guns. Traditional pneumatic rivet guns require constant gas compression and release during operation, a process that generates a strong impact sound, while the high-speed airflow friction within the pipes also produces sharp noise. This rivet gun, however, uses a battery as its power supply system. This not only makes the overall structure more compact and lightweight, facilitating portability and operation, but also significantly improves work efficiency, especially in space-constrained environments like aerospace manufacturing workshops where frequent tool movement is necessary. More importantly, it fundamentally eliminates the noise source generated by gas-related operations, resulting in a substantial reduction in noise during operation. For operators, this means working in a quieter, more comfortable environment, effectively reducing the potential hearing damage caused by long-term exposure to high noise levels, and minimizing distraction and operational errors due to noise interference, further ensuring work quality and production safety.

[0016] In the assembly of aerospace aluminum forgings, this low-noise characteristic offers unique advantages. Aerospace manufacturing demands extremely high standards for the working environment; a quiet environment allows operators to clearly hear subtle sound feedback regarding equipment operation and component assembly, facilitating the timely detection of potential problems. Furthermore, in aerospace testing or production processes with stringent acoustic requirements, the low-noise characteristics of the rivet gun described in this application can prevent interference with related equipment and test results, ensuring the smooth operation of the entire production process and the stable and reliable quality of the products. Attached Figure Description

[0017] The accompanying drawings, which form part of this specification, illustrate embodiments of the invention and, together with the specification, serve to explain the principles of the invention.

[0018] The invention will be more clearly understood with reference to the accompanying drawings and the following detailed description, wherein:

[0019] Figure 1 This is a schematic diagram of the overall external three-dimensional structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the overall internal three-dimensional structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the three-dimensional structure of the rivet head of the present invention;

[0022] Figure 4 This is a schematic diagram showing the position and three-dimensional structure of the internal components of the holster in this invention;

[0023] Figure 5 This is a top-view cross-sectional view of the inside of the holster in this invention;

[0024] Figure 6 This is a schematic diagram showing the position and three-dimensional structure of the internal components of the tie rod directional sleeve of the present invention;

[0025] Figure 7 This is a schematic diagram showing the position and three-dimensional structure of the internal components of the riveting spindle of the present invention.

[0026] In the diagram: 1. Riveting housing; 2. Riveting switch assembly; 3. Gun holster; 4. Pull rod directional sleeve; 5. Servo motor; 6. Gearbox; 7. Nut assembly; 8. Ball screw; 9. Riveting spindle; 900. Limit groove; 901. Pressure boosting rod; 10. Frameless motor; 11. Riveting head; 110. Core-pulling cavity; 111. Mounting groove; 12. Quick-release head; 13. Positioning bearing bracket; 14. Pressure plate; 15. Electrically connected slip ring assembly; 150. Electrically connected contact switch; 16. Core-pulling rivet rod; 162. Riveting clamp plate; 17. Pressure boosting sleeve. Detailed Implementation

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

[0028] Example 1, Rivet Gun Body Reference Figure 1 and Figure 2 The riveting housing 1 houses a servo motor 5 and a frameless motor 10, both controlled by the riveting switch assembly 2. Battery power is the preferred power source. Figure 2It can be clearly seen that a reduction gearbox 6 is fixedly mounted on the output shaft of the servo motor 5, which increases the transmitted torque. The output end of the reduction gearbox 6 drives the screw nut assembly 7 to rotate synchronously via a coupling sleeve. The screw nut assembly 7 is movably mounted in the riveting housing 1 using bearings, forcing the screw nut assembly 7 to rotate only. The inner side of the screw nut assembly 7 is threadedly connected to a ball screw 8, which can only reciprocate left and right along the inner side of the riveting housing 1. When the screw nut assembly 7 moves in both directions, the ball screw 8 can reciprocate left and right.

[0029] The ball screw 8 has a movably mounted riveting spindle 9 inside. It should be noted that the riveting spindle 9 and the ball screw 8 can not only rotate relative to each other, but the ball screw 8 can also drive the riveting spindle 9 to reciprocate left and right. Since the end of the riveting spindle 9 is movably mounted with a riveting head 11, when the riveting spindle 9 moves left and right, the riveting head 11, which is screwed into the nut rivet, can apply an axial tensile force to it, thereby limiting the nut rivet to the required position.

[0030] Regarding how the thread at the end of the rivet head 11 is screwed into / out of the nut rivet, combined with... Figure 2 As can be seen, a frameless motor 10 is fixedly installed inside the riveting housing 1 and is movably installed on the riveting spindle 9. The rotor of the frameless motor 10 is movably installed on the riveting spindle 9. On the one hand, the frameless motor 10 can drive the riveting spindle 9 to rotate in both directions using the rotor. On the other hand, the riveting spindle 9 can also move back and forth along the axial direction of the frameless motor 10.

[0031] In practical applications, the rivet head 11 is mounted on the rivet spindle 9, enabling the rivet spindle 9 to drive the rivet head 11 to rotate and move left and right. When it is necessary to install and fix the nut rivet, the frameless motor 10 is controlled to rotate by the rivet switch assembly 2, so that the rivet head 11 is screwed into the nut rivet in the forward direction.

[0032] After the nut and rivet are inserted into the desired position, the servo motor 5 is rotated by the rivet switch assembly 2. After being decelerated by the gearbox 6, the nut assembly 7 is forced to rotate synchronously. During the rotation of the nut assembly 7, it drags the ball screw 8 towards the servo motor 5. The ball screw 8 synchronously drags the rivet head 11 through the rivet spindle 9. The rivet head 11 pulls the nut and rivet to complete the rivet fixing work. Finally, the frameless motor 10 drives the rivet spindle 9 to rotate in the opposite direction, so that the rivet head 11 can be disengaged from the nut and rivet.

[0033] from Figure 1 and Figure 2As can be seen, a holster 3 is threadedly connected to the end of the rivet housing 1, and a pull rod guide sleeve 4 is threadedly connected to the end of the holster 3 to position and guide the rivet head 11. As mentioned above, when the rivet head 11 is pulled towards the rivet housing 1, the end of the pull rod guide sleeve 4 will naturally abut against the workpiece to be connected. The position constraint of the pull rod guide sleeve 4 ensures that the rivet head 11 has sufficient strength to pull the nut rivet, ensuring that the nut rivet can be fixed in the required position.

[0034] Example 2 is a further improvement on Example 1. Since the thread size at the end of the rivet head 11 varies, when it is necessary to replace rivet heads 11 of different sizes, please refer to [reference needed]. Figure 3 and Figure 4 As can be seen, symmetrical limiting grooves 900 are formed on the side of the riveting spindle 9. Correspondingly, quick-release heads 12, which are pushed outward by springs, are symmetrically and movably installed on the outer side of the riveting head 11. When the quick-release head 12 is pressed into the limiting groove 900, it is pushed by the spring to abut against the limiting groove 900, thus preventing the quick-release head 12 from disengaging from the limiting groove 900. Similarly, when disassembly is required, the operator only needs to simultaneously squeeze the quick-release head 12 to compress the spring and retract it to the side of the riveting head 11, thereby disengaging the quick-release head 12 from the limiting groove 900. Thus, it can be seen that the arrangement of the quick-release head 12 can meet the requirements for quick installation / disassembly of the riveting head 11.

[0035] Furthermore, to ensure that the rivet head 11 does not move axially within the limiting groove 900, from... Figure 5 and Figure 7 As can be seen, a pressure plate 14 is movably installed inside the riveting spindle 9 and is pushed outward by a spring. When the rivet head 11 is installed inside the riveting spindle 9, the pressure plate 14 makes the rivet head 11 always have the tendency to push outward, ensuring that the rivet head 11 will not move axially in the riveting spindle 9 after installation.

[0036] Example 3 is a further improvement on Example 2. In practical applications, due to different rivet types, such as blind rivets and nut rivets, the use of the rivet head 11 is limited, only applicable to nut rivets. To expand the application range of the rivet head 11, from... Figure 2 , Figure 5 and Figure 7 As can be seen, there are two core-pulling rivet rods 16 on the inner side of the rivet spindle 9, which are movably installed via a positioning pin. The two core-pulling rivet rods 16 can only move relatively closer to each other, guided by the positioning pin.

[0037] The inner side of the holster 3 has a pressure-boosting sleeve 17 that is bolted on. Figure 5It can be seen that there are two inner walls with different inner diameters on the inner side of the pressure-boosting sleeve 17, which are connected by a bevel. Correspondingly, pressure-boosting rods 901 are symmetrically and movably installed on the outer side of the riveting spindle 9. Springs are installed between the two pressure-boosting rods 901 and the core-pulling riveting rods 16. Under normal conditions, the springs not only push the core-pulling riveting rods 16 closer together, but also push the pressure-boosting rods 901 outward and against the inner wall of the holster 3. Figure 5 As shown, when the riveting spindle 9 moves to the right, the inner wall of the pressure sleeve 17 will cause the pressure push rod 901 to squeeze the core-pulling riveting rod 16, thereby increasing the contact strength between the two core-pulling riveting rods 16.

[0038] refer to Figure 3 and Figure 6 As can be seen, the rivet head 11 has a core-pulling cavity 110 inside, which provides space for the core rod when the core rivet is inserted into the core-pulling cavity 110. Furthermore, the rivet head 11 has a mounting groove 111 on its side, which is a rectangular groove open on one side. Correspondingly, a positioning bearing bracket 13 is movably mounted inside the pull rod directional sleeve 4. The positioning bearing bracket 13 is mainly connected by a bearing and a radially mounted shaft. When the rivet head 11 is installed on the rivet spindle 9, the shaft is inserted into the mounting groove 111. A rivet clamp 162 is fixedly mounted on the outer end of the core-pulling rivet rod 16, which can be used to fix the core shaft of the core rivet. Figure 5 As shown, when the spring pushes the pressure plate 14 to move to the left, the rivet head 11 will tend to move to the left, causing the quick-release head 12 to normally be attached to the left side of the limit groove 900.

[0039] Moreover, reference Figure 2 and Figure 5 As can be seen, an electrical slip ring assembly 15 is movably installed inside the holster 3. The electrical slip ring assembly 15 includes an electrical brush that can move axially along the holster 3 and an electrical ring fixed to the outer side of the end of the riveting spindle 9. The electrical brush is attached to the outer side of the electrical ring, ensuring electrical connection between the electrical brush and the electrical ring even when the riveting spindle 9 rotates. Electrical contact switches 150 are correspondingly installed at the two ends of the riveting spindle 9 located in the limiting groove 900, as shown in the reference. Figure 5 As shown, when the quick-release head 12 contacts the left-side power contact switch 150, it indicates that the rivet head 11 is screwed into the nut rivet. Correspondingly, when the quick-release head 12 contacts the right-side power contact switch 150, it indicates that the rivet head 11 is fitted with a pop rivet. Only when the power contact switch 150 is pressed will an electrical signal be sent to the rivet switch assembly 2, and the servo motor 5 will start working using the rivet switch assembly 2. Similarly, when the power contact switch 150 is not pressed, pressing the rivet switch assembly 2 will cause the frameless motor 10 to rotate first.

[0040] In actual work, under normal circumstances, such as Figure 5 As shown, the pressure boosting rod 901 is located at the left end of the pressure boosting sleeve 17. The spring pushes the pressure plate 14 to the left, causing the rivet head 11 to push to the left until the quick-release head 12 abuts against the left-side electrical contact switch 150.

[0041] When installing a nut and rivet, the nut and rivet are placed in the position to be tightened. The rivet head 11 is pressed against the nut and rivet, and the pull rod guide sleeve 4 is simultaneously pressed against the surface of the workpiece to be connected. At this time, because there is a certain gap between the thread of the nut and rivet and the workpiece, when the pull rod guide sleeve 4 is pressed against the workpiece, the rivet head 11 is not pressed and will not cause the quick-release head 12 to press against the right-side electrical contact switch 150. At the same time, the quick-release head 12 is positioned between the two electrical contact switches 150, i.e. Figure 5 The location shown.

[0042] As the riveting switch assembly 2 is activated, the frameless motor 10 rotates and screws the rivet head 11 into the nut rivet. As the rivet head 11 is screwed in deeper, the quick-release head 12 gradually moves towards the left-side electrical contact switch 150. When the quick-release head 12 contacts the electrical contact switch 150, it transmits an electrical signal to the riveting switch assembly 2 via the electrical slip ring assembly 15. This signal informs the riveting switch assembly 2 that the rivet head 11 has been screwed in. Next, the servo motor 5 is controlled to rotate, causing the gearbox 6 to drive the screw thread assembly 7 to rotate synchronously. The screw thread assembly 7 then causes the ball screw 8 to pull the riveting spindle 9 and the rivet head 11 to the right, completing the riveting action. After the riveting action is complete, the frameless motor 10 rotates in the opposite direction to remove the rivet head 11 from the rivet, and the servo motor 5 rotates in the opposite direction to return the ball screw 8 to its left-side position.

[0043] When the blind rivet needs to be installed, the rivet's core is inserted into the blind cavity 110 and held by the rivet clamp 162. After the blind rivet is inserted into the position to be fixed through the sleeve 3, the rivet housing 1 applies pressure towards the workpiece. Since the blind rivet is located on the workpiece surface, the pull rod guide sleeve 4 will eventually abut against the workpiece. At the same time, the positioning bearing bracket 13 abuts against the end of the mounting groove 111, and the quick-release head 12 will also abut against the right-side power contact switch 150. When the rivet switch assembly 2 is pressed again, since the power contact switch 150 is now turned on, the servo motor 5 will rotate directly and pull the rivet spindle 9 to the right.

[0044] The riveting spindle 9 synchronously drives the pressure boosting rod 901 to move to the right. The rightward-moving pressure boosting rod 901 abuts against the inner wall of the pressure boosting sleeve 17, further pressurizing the spring. This brings the two pull-riveting rods 16 closer together, increasing the clamping strength and the clamping strength of the pull-riveting clamp plate 162 on the core rod of the pull-riveting rivet. When the pull-riveting rod 16 moves to the right, it pulls the core rod until it breaks, thus completing the fixing action of the pull-riveting rivet. Afterwards, from... Figure 5 As can be seen, after the booster rod 901 continues to move to the right and enters the inner wall of the booster sleeve 17 with a larger diameter, the rivet clamp 162 will relatively reduce the clamping force on the core rod. As the core-pulling rivet rod 16 moves further to the right, the core rod will abut against the positioning bearing bracket 13 and slide relative to the rivet clamp 162.

[0045] Finally, when the gearbox 6 drives the riveting spindle 9 to move to the left to reset, the riveting clamp 162 keeps the core rod clamped. After the riveting spindle 9 has reset and is in its normal position, the riveting clamp 162 pushes the core rod out of the core-pulling cavity 110. At this time, the core rod of the pull rivet extends from the end of the riveting head 11. When used again, the end of the core rod can be removed.

Claims

1. A lightweight hand-held electric powered pull-rivet gun characterized by, The utility model relates to a kind of pull-riveting device, including: Pull-riveting shell (1) is internally provided with servo motor (5) and frameless motor (10) controlled by pull-riveting switch assembly (2); Servo motor (5) output shaft is rotated using reduction box (6) to make screw nut assembly (7), and the inside of screw nut assembly (7) is threadedly connected with ball screw (8) reciprocating along the inside of pull-riveting shell (1) left and right; Ball screw (8) is movably installed in pull-riveting main shaft (9), and pull-riveting main shaft (9) end movably installs pull-riveting head (11); Pull-riveting shell (1) inside is fixedly installed with frameless motor (10) movably installed with pull-riveting main shaft (9), and frameless motor (10) rotor is movably installed with pull-riveting main shaft (9); Frameless motor (10) drives pull-riveting main shaft (9) to drive pull-riveting head (11) to rotate, realizes that pull-riveting head (11) is screwed in / out from nut rivet; Servo motor (5) is driven according to screw nut assembly (7) and ball screw (8), realizes that pull-riveting head (11) is axially pulled to nut rivet; Pull-riveting main shaft (9) side is symmetrically provided with limit groove (900), and pull-riveting head (11) outside is symmetrically movably installed with quick release head (12) pushed outward by spring; Pull-riveting main shaft (9) inside is movably installed with pressing plate (14) pushed outward by spring; Pull-riveting main shaft (9) inside is installed with core-pulling pull-riveting rod (16), gun cover (3) inside is installed with booster sleeve (17), and pull-riveting main shaft (9) outside is symmetrically movably installed with booster ejector rod (901), and spring is installed between two booster ejector rods (901) and core-pulling pull-riveting rod (16); Pull-riveting head (11) inside is provided with core-pulling cavity (110), and pull-riveting head (11) side is provided with mounting groove (111), and pull rod directional sleeve (4) inside is movably installed with locating bearing frame (13), and pull-riveting clamp plate (162) is fixedly installed at the outside end of core-pulling pull-riveting rod (16), and the core of core-pulling rivet can be fixed using pull-riveting clamp plate (162).

2. The lightweight electric hand pull stud rifle gun according to claim 1, characterized in that, Pull-riveting shell (1) end is threadedly connected with gun cover (3), and gun cover (3) end is threadedly connected with pull rod directional sleeve (4) for positioning and guiding pull-riveting head (11).

3. The lightweight, hand-held electric powered pull stud gun of claim 1 wherein, Booster sleeve (17) inside has two inner walls with different inner diameters and uses slope transition.

4. The lightweight, hand-held electric powered pull stud gun of claim 1 wherein, Gun cover (3) inside movably installs electricity contact ring assembly (15), and electricity contact point switch (150) is installed in the inside of pull-riveting main shaft (9) and at the both ends of limit groove (900) correspondingly.

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