A rivet nut gun
Patent Information
- Application Number
- CN202522210360.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-20
- Publication Date
- 2026-10-23
- Estimated Expiration
- 2035-10-20
AI Technical Summary
[0002]铆螺母枪作为钣金加工、机械装配领域的核心铆接设备，主要用于在无预设螺纹孔的工件（如钣金件、铝合金壳体）上实现螺纹连接，通过“拧入 - 拉铆”一体化操作，将铆螺母牢固固定在工件孔位处，为后续螺栓连接提供基础；其凭借操作便捷、连接强度高的优势，广泛应用于汽车制造、家电组装、航空航天零部件生产等场景；然而，现有铆螺母枪在实际应用中仍存在诸多技术缺陷，难以满足高精度、高稳定性的铆接需求，具体问题包括：缺乏预定位触发机制，易引发误操作：现有设备无行程开关与限位支架的联动设计，通电启动不受工件对准状态约束；操作人员若未将枪嘴精准对准工件孔位，或铆螺母未平稳套设，误启动驱动机构后易导致铆螺母歪斜、工件孔位损坏，甚至引发设备卡滞故障，增加返工成本；拧入过程无有效检测，易出现虚拧：现有驱动机构（如普通电机）仅通过预设转速控制拧入动作，缺乏扭力检测模块与圈数计数功能；实际操作中，仅依赖操作人员经验判断铆螺母是否拧入到位，若出现铆螺母螺纹卡顿、工件表面不平整等情况，易导致“未拧入即停止”或“过度拧入损坏螺纹”，后续拉铆时易出现铆接松动等问题；为此，提出一种新的铆螺母枪
[0011]本实用新型整体结构稳定，通过行程开关与限位支架的联动触发，仅在枪嘴对准孔位后才通电，彻底避免误操作导致的设备与工件损坏；伺服电机与多边形连轴杆的传动结构，配合扭力与圈数双重检测，确保铆螺母精准拧入到位，无虚拧或过度拧入问题；液压压力与位移的双重检测机制，覆盖不同工件厚度的适配需求，大幅降低不合格品率；行程复位弹簧实现自动复位，无需人工调整，满足批量生产需求。
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Figure CN224880449U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of riveting equipment technology, and more specifically, it relates to a rivet nut gun. Background Technology
[0002] As a core riveting device in sheet metal processing and mechanical assembly, the rivet nut gun is mainly used to achieve threaded connections on workpieces without pre-set threaded holes (such as sheet metal parts and aluminum alloy housings). Through an integrated "screwing-riveting" operation, the rivet nut is firmly fixed to the workpiece hole, providing a foundation for subsequent bolt connections. Due to its advantages of convenient operation and high connection strength, it is widely used in automotive manufacturing, home appliance assembly, and aerospace component production. However, existing rivet nut guns still have many technical defects in practical applications, making it difficult to meet the requirements of high-precision and high-stability riveting. Specific problems include: lack of a pre-positioning trigger mechanism, easily leading to misoperation; existing equipment lacks a linkage design between the travel switch and the limit bracket, and the power-on start is not constrained by the workpiece alignment state; if the operator does not accurately align the nozzle with the workpiece hole, or the rivet nut is not properly aligned... The existing drive mechanism is prone to misalignment of the rivet nut, damage to the workpiece hole, and even equipment jamming after accidental activation, increasing rework costs. Furthermore, the lack of effective detection during the tightening process leads to incomplete tightening: existing drive mechanisms (such as ordinary motors) only control the tightening action through preset speed, lacking torque detection modules and rotation counting functions. In actual operation, operators rely solely on their experience to judge whether the rivet nut is properly tightened. If the rivet nut thread is stuck or the workpiece surface is uneven, it can easily lead to "stopping before tightening" or "over-tightening and damaging the thread," resulting in loosening of the riveting joint during subsequent riveting. Therefore, a new rivet nut gun is proposed. Utility Model Content
[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a rivet nut gun to solve the technical problems existing in the background art.
[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a rivet nut gun, comprising: a gun body, a gun head, a gun nozzle, a rivet nut mechanism, a drive mechanism for press riveting the rivet nut mechanism, a hydraulic mechanism for pull riveting the rivet nut mechanism, a displacement sensor, a limit switch, a limit bracket, and a control mechanism; the hydraulic mechanism and the drive mechanism are sequentially arranged inside the gun body along the length direction of the gun body; the gun nozzle and the gun head are sequentially arranged at one end of the gun body near the hydraulic mechanism; one end of the rivet nut mechanism passes through the gun head and the gun nozzle sequentially and is placed outside the gun nozzle; the other end of the rivet nut mechanism... One end passes through the gun body and is fixedly connected to the first output end of the hydraulic mechanism, and its extended end passes through the hydraulic mechanism and is drivenly connected to the output end of the drive mechanism; the limiting bracket is disposed in the gap between the hydraulic mechanism and the drive mechanism, and is fixedly connected to the second output end of the hydraulic mechanism; the limit switch is fixedly connected to the rivet nut mechanism and is located on the side of the limiting bracket closer to the hydraulic mechanism; the displacement sensor is installed on the other side of the limiting bracket away from the hydraulic mechanism and can abut against the limiting bracket; the control mechanism is electrically connected to the drive mechanism, the hydraulic mechanism, the displacement sensor and the limit switch respectively.
[0005] Optionally, the rivet nut mechanism includes: a rivet nut rod, a connecting rod, a guide rod, and a cap; one end of the rivet nut rod is movably mounted on the nozzle, and its extended end passes through the nozzle and is positioned outside the nozzle; one end of the connecting rod is slidably sleeved on the other end of the rivet nut rod; the connecting rod is slidably installed inside the gun head; the other end of the connecting rod is fixedly connected to one end of the guide rod; the other end of the guide rod can abut against the output end of the hydraulic mechanism, and its extended end passes through the hydraulic mechanism and is fixedly connected to the cap; the limit switch is installed on the cap.
[0006] Optionally, a stroke return spring is also included; the outer wall of the end of the guide rod near the cap is provided with a mounting groove; the stroke return spring is sleeved in the groove, and its two ends abut against the guide rod and the limiting bracket respectively.
[0007] Optionally, the driving mechanism includes: a drive motor and a connecting rod; the motor is installed inside the gun body, and its output end is fixedly connected to one end of the connecting rod; a polygonal receiving groove is provided at one end of the guide rod near the cap; the other end of the connecting rod passes through the limiting bracket and the stroke return spring in sequence and can be slidably placed in the receiving groove; a polygonal structure adapted to the receiving groove is provided on the outer wall of one end of the connecting rod near the guide rod; a torque detection module is provided on the drive motor; the drive motor and the torque detection module are electrically connected to the control mechanism respectively.
[0008] Optionally, the control mechanism includes: a controller and a push-button switch; a grip handle is provided on the gun body; the push-button switch is installed on the grip handle; the controller is installed inside the gun body and is electrically connected to the push-button switch, the drive motor, the hydraulic mechanism, the displacement sensor, and the limit switch respectively.
[0009] Optionally, the hydraulic mechanism includes: a piston, a piston rod, a hydraulic sensor, and a hydraulic drive module; a hydraulic chamber is provided inside the gun body; the piston is slidably installed inside the hydraulic chamber, and one end of it is fixedly connected to the limiting bracket; the other end of the piston is fixedly connected to one end of the piston rod; the other end of the piston rod passes through the gun body and is placed inside the gun head; the end of the guide rod away from the connecting rod passes through the piston rod and the piston in sequence and is fixedly connected to the cap, and the outer wall of the guide rod abuts against the inner wall of the piston rod; a hydraulic oil circuit is provided on the gun body; the hydraulic drive module is connected to the hydraulic chamber through the hydraulic oil circuit; the piston and the piston rod are integrally formed; the hydraulic sensor is disposed in the hydraulic oil circuit.
[0010] Optionally, a hydraulic return spring is also included; the hydraulic return spring is sleeved on the connecting rod, and its two ends respectively abut against the interior of the limiting bracket and the gun body.
[0011] This utility model features a stable overall structure. Through the linkage triggering of the limit switch and the limit bracket, power is only applied after the nozzle is aligned with the hole, completely preventing damage to the equipment and workpiece due to misoperation. The transmission structure of the servo motor and the polygonal coupling rod, combined with dual torque and rotation count detection, ensures that the rivet nut is precisely screwed in, without any issues of loose or over-tightening. The dual detection mechanism of hydraulic pressure and displacement covers the adaptation requirements of different workpiece thicknesses, significantly reducing the defect rate. The stroke return spring enables automatic reset, eliminating the need for manual adjustment and meeting the needs of mass production. Attached Figure Description
[0012] Figure 1 This is an assembly drawing of this utility model; Figure 2 This is a schematic diagram of the structure of this utility model during assembly; Figure 3 yes Figure 1 A sectional view; Figure 4 This is a schematic diagram of the drive mechanism and its components in this utility model.
[0013] In the diagram: 1. Gun body; 2. Gun head; 3. Gun nozzle; 4. Riveting nut mechanism; 41. Riveting nut rod; 42. Connecting rod; 43. Guide rod; 44. Screw cap; 45. Stroke return spring; 5. Drive mechanism; 51. Drive motor; 52. Connecting shaft; 6. Hydraulic mechanism; 61. Piston; 62. Piston rod; 63. Hydraulic oil circuit; 64. Hydraulic return spring; 7. Control mechanism; 71. Push button switch; 8. Displacement sensor; 9. Limit switch; 10. Limit bracket; 11. Grip handle. Detailed Implementation
[0014] To make the objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein.
[0015] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.
[0016] In this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. The terms "vertical," "horizontal," "left," "right," "above," "below," and similar expressions are for illustrative purposes only and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as limiting the invention.
[0017] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0018] like Figure 1 As shown, this utility model provides a rivet nut gun, including: a gun body 1, a gun head 2, a nozzle 3, a rivet nut mechanism 4, a drive mechanism 5 for press riveting of the rivet nut mechanism 4, a hydraulic mechanism 6 for pull riveting of the rivet nut mechanism 4, a displacement sensor 8, a limit switch 9, a limit bracket 10, and a control mechanism 7; the hydraulic mechanism 6 and the drive mechanism 5 are sequentially arranged inside the gun body 1 along the length direction of the gun body 1; the nozzle 3 and the gun head 2 are sequentially arranged at one end of the gun body 1 near the hydraulic mechanism 6; one end of the rivet nut mechanism 4 passes through the gun head 2 and the nozzle 3 and is placed outside the nozzle 3; the other end of the rivet nut mechanism 4 passes through the gun body. The first output end of the hydraulic mechanism 6 is fixedly connected to the first output end of the hydraulic mechanism 6, and its extended end passes through the hydraulic mechanism 6 and is connected to the output end of the drive mechanism 5; the limiting bracket 10 is disposed in the gap between the hydraulic mechanism 6 and the drive mechanism 5, and is fixedly connected to the second output end of the hydraulic mechanism 6; the limit switch 9 is fixedly connected to the rivet nut mechanism 4 and is located on the side of the limiting bracket 10 close to the hydraulic mechanism 6; the displacement sensor 8 is installed on the other side of the limiting bracket 10 away from the hydraulic mechanism 6 and can abut against the limiting bracket 10; the control mechanism 7 is electrically connected to the drive mechanism 5, the hydraulic mechanism 6, the displacement sensor 8 and the limit switch 9 respectively.
[0019] In this embodiment, as Figure 1-2As shown, the gun body 1 is a hollow, elongated structure, internally divided into a hydraulic mounting area and a drive mounting area along its length: the end closer to the nozzle 3 is the hydraulic mounting area, and the end farther from the nozzle 3 is the drive mounting area; the gun head 2 is a cylindrical structure, coaxially fixed to the end of the gun body 1 near the hydraulic mounting area, and has a stepped sliding cavity inside; the nozzle 3 is a conical sleeve structure, coaxially fixed to the end of the gun head 2 away from the gun body 1, and has a through hole in its center. The diameter of the through hole is clearance-fitted with the outer diameter of the riveting end of the rivet nut mechanism 4, ensuring both flexible rotation of the rivet nut mechanism 4 and preventing radial wobbling of the riveting end of the rivet nut mechanism 4; the conical end face of the nozzle 3 can fit against the surface of the sheet metal workpiece, ensuring coaxiality of the holes during riveting; the limit bracket 10 is a "U"-shaped structure, set in the gap between the hydraulic mechanism 6 and the drive mechanism 5. The function of the limit bracket 10 is to provide a trigger reference for the limit switch 9 and to provide displacement... Sensor 8 provides mounting support; the limit switch 9 is a contact trigger switch with its trigger end facing the limit bracket 10. When the trigger end of the limit switch 9 contacts the limit bracket 10, it can send an electrical signal to the control mechanism 7 to realize the function of energizing after alignment; the displacement sensor 8 is a linear displacement sensor 8 (such as a grating sensor), which is installed on the side of the limit bracket 10 away from the hydraulic mechanism 6 through the bracket, and its detection end abuts against the end face of the limit bracket 10; the displacement sensor 8 can indirectly obtain the axial displacement of the rivet nut mechanism 4 through the displacement change of the limit bracket 10; in use, the operator puts the rivet nut to be riveted on the exposed working end of the rivet nut rod 41 to ensure that the rivet nut and the rivet nut rod 41 are threadedly engaged; then, the operator holds the handle 11 of the gun body 1, puts the conical end face of the nozzle 3 against the surface of the sheet metal workpiece, aligns the rivet nut with the preset hole position of the workpiece, and slowly presses the gun body 1 down towards the workpiece. During the pressing process, the rivet nut is subjected to the reaction force of the workpiece surface, which drives the rivet nut mechanism to move into the gun body (closer to the hydraulic mechanism), thereby driving the limit switch 9 to move closer to the limit bracket 10. When the trigger end of the limit switch 9 is fully in contact with the end face of the limit bracket 10, the limit switch 9 sends an "alignment in place" electrical signal to the control mechanism 7. After receiving the signal, the control mechanism 7 connects the power supply circuit of the drive mechanism 5 and the hydraulic mechanism 6, and the equipment enters the "standby working state". The overall structure is stable and easy to install.
[0020] Further, the rivet nut mechanism 4 includes: a rivet nut rod 41, a connecting rod 42, a guide rod 43, and a cap 44; one end of the rivet nut rod 41 is movably mounted on the nozzle 3, and its extended end passes through the nozzle 3 and is positioned outside the nozzle 3; one end of the connecting rod 42 is slidably sleeved on the other end of the rivet nut rod 41; the connecting rod 42 is slidably installed inside the gun head 2; the other end of the connecting rod 42 is fixedly connected to one end of the guide rod 43; the other end of the guide rod 43 can abut against the output end of the hydraulic mechanism 6, and its extended end passes through the hydraulic mechanism 6 and is fixedly connected to the cap 44; the limit switch is installed on the cap 44.
[0021] In this embodiment, as Figure 1-4 As shown, the rivet nut rod 41 is a stepped screw rod. One end (working end) is movably inserted through the through hole of the nozzle 3 and extends to the outside of the nozzle 3 for fitting the rivet nut to be riveted. The outer wall of the other end is provided with sliding grooves, which slide in cooperation with the inner wall of one end of the connecting rod 42, so that the connecting rod 42 can slide along the axial direction of the rivet nut rod 41, but when rotating, it drives the rivet nut rod 41 to rotate simultaneously. The connecting rod 42 is a hollow rod body, which is slidably installed in the sliding cavity of the gun head 2. Its end away from the rivet nut rod 41 is fixedly connected to one end of the guide rod 43 by welding to realize the transmission of force and motion. The guide rod 43 is a long rod structure. Its end away from the connecting rod 42 passes through the center hole of the piston rod 62 and the center hole of the piston 61 in sequence, and then connects with the cap 44. The piston rod 62 is fixed by threads; the center hole of the piston rod 62 and the center hole of the piston 61 cooperate to form a T-shaped elongated guide rod 43 with a limiting protrusion, so that the piston rod 62 can drive the guide rod 43 to move synchronously by abutting against the limiting protrusion for riveting action; the outer wall of the guide rod 43 near the cap 44 has an annular mounting groove for installing the stroke return spring 45; at the same time, this end also has a polygonal receiving groove (such as a regular hexagonal groove) for cooperating with the connecting rod 52; the cap 44 has a disc-shaped structure, and in addition to being fixed to the guide rod 43, the side of it near the limiting bracket 10 is also equipped with a limit switch 9 by screws to ensure that the limit switch 9 can move synchronously with the guide rod 43.
[0022] Furthermore, it also includes a stroke return spring 45; the outer wall of the end of the guide rod 43 near the cap 44 is provided with a mounting groove; the stroke return spring 45 is sleeved in the groove, and its two ends abut against the guide rod 43 and the limiting bracket 10 respectively.
[0023] In this embodiment, as Figure 1-4As shown, the stroke return spring 45 is a cylindrical helical compression spring, which is sleeved in the mounting groove of the guide rod 43. One end of the spring abuts against the end face of the groove of the guide rod 43, and the other end abuts against the end face of the limit bracket 10. During riveting, the guide rod 43 moves backward, compressing the stroke return spring 45. After the riveting is completed and the pressure is released, the spring releases its elastic force and pushes the guide rod 43 forward to return to the initial position, preparing for the next riveting.
[0024] Further, the drive mechanism 5 includes: a drive motor 51 and a connecting rod 52; the motor is installed inside the gun body 1, and its output end is fixedly connected to one end of the connecting rod 52; the guide rod 43 has a polygonal receiving groove at one end near the cap 44; the other end of the connecting rod 52 passes through the limiting bracket 10 and the stroke return spring 45 in sequence and can be slidably placed in the receiving groove; the outer wall of the connecting rod 52 near one end of the guide rod 43 is provided with a polygonal structure adapted to the receiving groove; the drive motor 51 is provided with a torque detection module; the drive motor 51 and the torque detection module are electrically connected to the control mechanism 7 respectively.
[0025] In this embodiment, as Figure 1-4 As shown, the drive motor 51 is a servo motor, which is fixed to the drive mounting area of the gun body 1 by bolts. Its output shaft is fixedly connected to one end of the connecting rod 52 by a coupling, which can realize forward and reverse control. The connecting rod 52 is a long rod structure, and its end away from the servo motor is processed into a polygonal structure. After passing through the center hole of the limit bracket 10 and the inner hole of the stroke return spring 45 in sequence, the connecting rod 52 slides into the polygonal receiving groove of the guide rod 43. This polygonal mating structure can ensure that when the connecting rod 52 rotates, it drives the guide rod 43 to rotate synchronously without affecting the axial movement of the guide rod 43. The torque detection module is integrated at the output end of the servo motor, which can detect the output torque of the servo motor in real time and transmit the data to the control mechanism 7 to determine whether the rivet nut is screwed in properly.
[0026] Furthermore, the control mechanism 7 includes: a controller and a push-button switch 71; a grip handle 11 is provided on the gun body 1; the push-button switch 71 is installed on the grip handle 11; the controller is installed inside the gun body 1 and is electrically connected to the push-button switch 71, the drive motor 51, the hydraulic mechanism 6, the displacement sensor 8 and the limit switch 9 respectively.
[0027] In this embodiment, the controller is an embedded controller (such as an STM32 series microcontroller), installed in the control chamber inside the gun body 1. It is electrically connected to the push button switch 71, servo motor, torque detection module, hydraulic drive module, hydraulic sensor, displacement sensor 8, and limit switch 9 via wires to realize signal acquisition, logic judgment, and action control. The controller also has a built-in parameter storage module, which can preset the number of turns, torque threshold, riveting pressure, and displacement threshold, and is equipped with a buzzer and LED indicator for alarm prompts. The push button switch 71 is a self-resetting button, embedded in the grip handle 11 of the gun body 1 for easy operation by the operator. The push button switch 71 is a riveting trigger button, which is only effective after the limit switch 9 is triggered to avoid accidental triggering. In other embodiments, the controller can be an external PLC or an industrial computer, etc., that controls the orderly operation of various electrical components.
[0028] Further, the hydraulic mechanism 6 includes: a piston 61, a piston rod 62, a hydraulic sensor, and a hydraulic drive module; a hydraulic chamber is provided inside the gun body 1; the piston 61 is slidably installed in the hydraulic chamber, and one end of it is fixedly connected to the limiting bracket 10; the other end of the piston 61 is fixedly connected to one end of the piston rod 62; the other end of the piston rod 62 passes through the gun body 1 and is placed inside the gun head 2; the end of the guide rod 43 away from the connecting rod 42 passes through the piston rod 62 and the piston 61 in sequence and is fixedly connected to the cap 44, and the outer wall of the guide rod 43 abuts against the inner wall of the piston rod 62; a hydraulic oil circuit 63 is provided on the gun body 1; the hydraulic drive module is connected to the hydraulic chamber through the hydraulic oil circuit 63; the hydraulic sensor is disposed in the hydraulic oil circuit 63.
[0029] In this embodiment, as Figure 1-4 As shown, the hydraulic chamber is a cylindrical cavity within the hydraulic mounting area of the gun body 1. Its inner wall is precision polished to ensure smooth sliding of the piston 61. The piston 61 is a rubber-sealed piston, slidably mounted within the hydraulic chamber, with its outer wall tightly fitted to the inner wall of the hydraulic chamber. One end of the piston 61 is fixed to the limiting bracket 10 by bolts, and the other end is integrally formed with the piston rod 62. The piston rod 62 is a stepped rod, with one end fixed to the piston 61 and the other end passing through the connection between the gun body 1 and the gun head 2, extending into the sliding cavity of the gun head 2. Its central hole allows the guide rod 43 to pass through. The hydraulic drive module can be a micro electric hydraulic pump, hydraulic station, air-liquid booster, or servo hydraulic booster, etc., and can be configured according to actual conditions. It is located outside the drive mounting area of the gun body 1 and connected to the hydraulic chamber 13 via the hydraulic oil circuit 63, used to inject or extract hydraulic oil into the hydraulic chamber. A hydraulic sensor is connected in series on the hydraulic oil circuit 63 to detect the pressure value within the oil circuit in real time.
[0030] Furthermore, it also includes a hydraulic return spring 64; the hydraulic return spring 64 is sleeved on the connecting rod 52, and its two ends respectively abut against the interior of the limiting bracket 10 and the gun body 1.
[0031] In this example, the hydraulic reset spring 64 is a cylindrical helical compression spring, which is sleeved on the connecting rod 52 and abuts against the inside of the limiting bracket 10 and the gun body 1 respectively, so that after the hydraulic mechanism 6 completes the riveting operation, it pushes the piston 61 and the piston rod 62 to reset.
[0032] This utility model discloses a rivet nut gun that uses a limit switch and a limit bracket for linkage triggering, ensuring that power is only applied after the nozzle is aligned with the hole, thus completely avoiding damage to the equipment and workpiece caused by misoperation. The transmission structure of the servo motor and the polygonal coupling rod, combined with dual detection of torque and number of turns, ensures that the rivet nut is accurately screwed in, without any issues of loose or over-tightening. The dual detection mechanism of hydraulic pressure and displacement covers the adaptation requirements of different workpiece thicknesses, significantly reducing the defect rate. The stroke return spring enables automatic reset, eliminating the need for manual adjustment and meeting the needs of mass production.
[0033] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.
Claims
1. A rivet nut gun, characterized in that, include: The gun comprises a gun body, a gun head, a nozzle, a rivet nut mechanism, a drive mechanism for press-fitting the rivet nut mechanism, a hydraulic mechanism for pull-fitting the rivet nut mechanism, a displacement sensor, a limit switch, a limit bracket, and a control mechanism. The hydraulic mechanism and the drive mechanism are sequentially arranged within the gun body along its length. The nozzle and gun head are sequentially arranged at one end of the gun body near the hydraulic mechanism. One end of the rivet nut mechanism passes through the gun head and nozzle and is positioned outside the nozzle. The other end of the rivet nut mechanism passes through the gun body and is fixedly connected to the first output end of the hydraulic mechanism, and its extended end passes through the hydraulic mechanism and is drively connected to the output end of the drive mechanism. The limit bracket is disposed within the gap between the hydraulic mechanism and the drive mechanism and is fixedly connected to the second output end of the hydraulic mechanism. The limit switch is fixedly connected to the rivet nut mechanism and is located on the limit bracket near the hydraulic mechanism. The displacement sensor is installed on the limit bracket away from the hydraulic mechanism and can abut against the limit bracket. The control mechanism is electrically connected to the drive mechanism, the hydraulic mechanism, the displacement sensor, and the limit switch.
2. The rivet nut gun according to claim 1, characterized in that, The rivet nut mechanism includes: a rivet nut rod, a connecting rod, a guide rod, and a cap; one end of the rivet nut rod is movably inserted through the nozzle, and its extended end passes through the nozzle and is positioned outside the nozzle; one end of the connecting rod is slidably sleeved on the other end of the rivet nut rod; the connecting rod is slidably installed inside the nozzle; the other end of the connecting rod is fixedly connected to one end of the guide rod; the other end of the guide rod can abut against the output end of the hydraulic mechanism, and its extended end passes through the hydraulic mechanism and is fixedly connected to the cap; the limit switch is installed on the cap.
3. A rivet nut gun according to claim 2, characterized in that, It also includes a stroke return spring; the outer wall of the end of the guide rod near the cap is provided with a mounting groove; the stroke return spring is sleeved in the groove, and its two ends abut against the guide rod and the limiting bracket respectively.
4. A rivet nut gun according to claim 3, characterized in that, The driving mechanism includes: a drive motor and a connecting rod; the motor is installed inside the gun body, and its output end is fixedly connected to one end of the connecting rod; a polygonal receiving groove is provided at one end of the guide rod near the cap; the other end of the connecting rod passes through the limiting bracket and the stroke return spring in sequence and can be slidably placed in the receiving groove; a polygonal structure adapted to the receiving groove is provided on the outer wall of one end of the connecting rod near the guide rod; a torque detection module is provided on the drive motor; the drive motor and the torque detection module are electrically connected to the control mechanism respectively.
5. A rivet nut gun according to claim 4, characterized in that, The control mechanism includes: a controller and a push-button switch; a grip handle is provided on the gun body; the push-button switch is installed on the grip handle; the controller is electrically connected to the push-button switch, the drive motor, the hydraulic mechanism, the displacement sensor and the limit switch respectively.
6. A rivet nut gun according to claim 5, characterized in that, The hydraulic mechanism includes: a piston, a piston rod, a hydraulic sensor, and a hydraulic drive module; a hydraulic chamber is provided inside the gun body; the piston is slidably installed inside the hydraulic chamber, and one end of it is fixedly connected to the limiting bracket; the other end of the piston is fixedly connected to one end of the piston rod; the other end of the piston rod passes through the gun body and is placed inside the gun head; the end of the guide rod away from the connecting rod passes through the piston rod and the piston in sequence and is fixedly connected to the cap, and the outer wall of the guide rod abuts against the inner wall of the piston rod; a hydraulic oil circuit is provided on the gun body; the hydraulic drive module is connected to the hydraulic chamber through the hydraulic oil circuit; the piston and the piston rod are integrally formed; the hydraulic sensor is disposed in the hydraulic oil circuit.
7. A rivet nut gun according to claim 6, characterized in that, It also includes a hydraulic return spring; the hydraulic return spring is sleeved on the connecting rod, and its two ends respectively abut against the inside of the limiting bracket and the gun body.