A hot melt self-tapping drill rivet automatic nail feeding device and quality monitoring method

Abstract

The present invention proposes a hot melt self-tapping drill rivet automatic nail feeding device and quality monitoring method, which belongs to the field of riveting technology. The device includes a rivet silo mechanism for storing rivets, a vibration plate mechanism for arranging rivets neatly, a nail blowing mechanism for blowing rivets, a rivet flipping mechanism for turning the direction of rivets, a cap-finding and tightening mechanism for providing rotational torque and axial pressure, and a control mechanism. The device of the present invention has a high degree of automation and has a precise control and feedback mechanism to ensure the accuracy and efficiency of the riveting process; the quality monitoring method includes the steps of starting the device, obtaining the performance parameters of the connected parts, setting the initial processing parameters, real-time monitoring and data collection, adjustment and control, recording data and optimizing parameters, and quality inspection. The present invention uses the length-to-thickness ratio k of the conical section formed after drilling and riveting as the quality control standard to adjust the processing parameters in real time to ensure the consistency and reliability of the riveted structure and improve product quality.

Description

Technical Field

[0001] The invention relates to the technical field of riveting, and in particular to a hot-melt self-tapping drill riveting automatic nail feeding device and a quality monitoring method. Background Art

[0002] With the continuous development of the automotive industry, lightweighting has become an important trend to improve fuel efficiency, reduce emissions and improve overall performance. In order to meet this demand, modern white bodies are increasingly using high-strength, low-density materials such as aluminum alloys. These materials can not only effectively reduce the weight of the body, but also improve the strength and safety of the vehicle. However, the connection process of high-strength materials such as aluminum alloys faces many challenges. Traditional connection processes, such as spot welding and riveting, although widely used in steel connections, have obvious limitations in the connection of high-strength materials such as aluminum alloys. Spot welding is prone to problems such as poor welding and insufficient weld strength in aluminum alloy connections. Due to the good thermal conductivity of aluminum alloys, the heat-affected zone is easily enlarged during welding, thereby affecting the mechanical properties of the material. In addition, spot welding has high requirements for the surface treatment of the material, which increases the production cost and process complexity.

[0003] Therefore, hot melt drilling and riveting technology came into being and became an ideal solution. This technology heats the conical head of the self-tapping screw to soften it at high temperature and drill holes in materials such as aluminum alloys, while cutting the self-tapping thread to form a strong connection. However, the existing hot melt drilling and riveting equipment has a low degree of automation and still relies on manual feeding. It has a low degree of automation and a high error rate. It lacks precise control and feedback mechanisms, and cannot monitor the position and direction of the rivets in real time. The rivet position deviation may occur during the feeding process, resulting in the rivet not being accurately delivered to the predetermined position, thereby affecting the smoothness of subsequent operations.

[0004] Secondly, the existing hot melt drilling and riveting technology often lacks real-time monitoring of key indicators that directly affect the structural strength. There is no real-time measurement or evaluation method for the actual connection strength after riveting, which means that the problem of insufficient connection strength cannot be discovered in time during the production process. It can only be discovered through subsequent sampling inspection, which has serious lags. When the problem of insufficient connection strength in a batch of products is discovered through sampling inspection, a large number of products may have been completed, and the entire batch of products may need to be retested or reworked, which will consume a lot of time and resources. In addition, there is a risk of missed inspections in sampling inspections, which may cause products with connection strength problems to enter the market, affecting the overall quality and safety of the products.

[0005] In view of the above technical defects, it is urgent to design a hot-melt self-tapping drill rivet automatic nail feeding equipment and quality monitoring method to solve the existing technical bottlenecks. Summary of the invention

[0006] The purpose of the present invention is to provide a hot melt self-tapping drill riveting automatic nail feeding device and a quality monitoring method to solve the above technical problems.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A hot-melt self-tapping drill rivet automatic nail feeding device, comprising a workbench, a rivet hopper mechanism, a vibration plate mechanism, a nail blowing mechanism, a rivet turning mechanism, a cap-finding and tightening mechanism, and a control mechanism;

[0009] The rivet silo mechanism is used to store rivets, and includes a support column, a silo, a feeding belt and a reduction motor. The support column is fixed to the workbench, and the silo is provided on the top of the support column. The top of the silo is a feeding port, and a discharge port is provided on the side opposite to the feeding port. The discharge port cooperates with the input end of the feeding belt. The reduction motor drives the feeding belt to move, and then drives the rivets on the feeding belt to enter the vibration plate mechanism. The reduction motor is electrically connected to the control mechanism.

[0010] The vibration plate mechanism is used to arrange the rivets neatly, and comprises a support frame, a vibration plate and a pulse electromagnet. The support frame is mounted on the workbench, the pulse electromagnet is mounted on the support frame, the pulse electromagnet is electrically connected to the control mechanism, the vibration plate is movably mounted on the support frame through an inclined spring sheet, and a discharge pipe is provided at the output end of the vibration plate, and the output end of the discharge pipe is connected to the input end of the rivet blowing mechanism;

[0011] The nail blowing mechanism is used to blow rivets to the rivet flipping mechanism, and the nail blowing mechanism includes a first feed channel, a nail separating device, a first nail blowing device and a first discharge channel. The input end of the first feed channel is connected to the output end of the discharge pipe, and the nail separating device is arranged between the output end of the first feed channel and the input end of the first discharge channel. A nail separating cylinder is arranged in the nail separating device, which is used as a power source for nail separating operation. The first nail blowing device is arranged on one side of the nail separating device and opposite to the first discharge channel. The first nail blowing device is provided with a nail blowing nozzle, which is embedded in the output end of the nail separating device and coaxially aligned with the output end of the nail separating device and the input end of the first discharge channel, and is used to blow the rivets in the output end of the nail separating device to the first discharge channel. The output end of the first discharge channel is connected to the input end of the rivet flipping mechanism, and the rivets are transported to the rivet flipping mechanism for flipping operation.

[0012] The rivet flipping mechanism is used to reverse the direction of the rivet, and a second feed channel, a flipping device and a second discharge channel are connected in sequence between the input end and the output end of the rivet flipping mechanism, the input end of the second feed channel is connected to the output end of the first discharge channel, the flipping device comprises a rivet dropping tray, a stepper motor and a second nail blowing device, the rivet dropping tray is arranged between the output end of the second feed channel and the input end of the second discharge channel, the rivet dropping tray is connected to the rotating shaft of the stepper motor, and the rivet dropping tray is driven by the stepper motor to rotate an angle θ to complete the flipping operation of the rivet posture, the output end of the second nail blowing device cooperates with the input end of the rivet dropping tray after the rotation angle θ, and is used to blow the rivet that has completed the flipping operation out of the second discharge channel, the output end of the second discharge channel is connected to the input end of the cap-finding and tightening mechanism, and the flipped rivet is transported to the cap-finding and tightening mechanism for drilling and riveting operation;

[0013] A rotating rod is arranged inside the cap-finding and tightening mechanism, and the cap-finding and tightening mechanism drives the rotating rod to provide a rotating torque and an axial pressure to the rivet so as to pierce the connected part and complete the drilling and riveting operation.

[0014] As a preferred technical solution of the present invention, a driving wheel is provided at the output end of the reduction motor, the reduction motor drives the driving wheel to rotate, and the driving wheel drives the driven wheel arranged on the feeding belt to rotate through a transmission belt.

[0015] As a preferred technical solution of the present invention, a vibrating disk sorting track is fixedly connected to the inner surface wall of the vibrating disk, and the output end of the vibrating disk sorting track is connected to the input end of the discharge pipe.

[0016] As a preferred technical solution of the present invention, a feed channel rivet detection sensor is provided on the first feed channel, a split nail detection sensor is provided on the split nail device, and a rivet blow-out sensor is provided on the first nail blowing device, and the split nail cylinder, the nail blowing nozzle, the feed channel rivet detection sensor, the split nail detection sensor and the rivet blow-out sensor are all electrically connected to the control mechanism;

[0017] The nail separation device comprises a nail separation cover plate, a nail separation base, a nail separation block and a baffle plate, wherein the nail separation cover plate is arranged on the top of the nail separation base, and the baffle plate is arranged on the left and right ends of the nail separation base, and a chamber for accommodating the nail separation block is formed by the nail separation cover plate, the nail separation base and the baffle plate, and the nail separation cylinder is connected to the nail separation block through a floating joint to drive the nail separation block to slide back and forth in the chamber, and the nail separation base is installed on the vertical plate, and a first notch for transmitting rivets is provided at the connection between the nail separation cover plate and the first feed channel, and a second notch adapted to the first notch is provided on the nail separation block for receiving rivets from the discharge pipe, and buffers are provided on the baffle plates, and the first discharge channel is arranged on the nail separation cover plate and receives rivets from the nail separation block; a through hole is provided on the nail separation base, and the through hole is aligned with the input end of the first discharge channel, and one end of the nail blowing nozzle is connected to the through hole through an air pipe, and the other end is connected to an air source, and the air source provides power for the nail blowing operation.

[0018] As a preferred technical solution of the present invention, the stepper motor drives the rivet drop plate to rotate at an angle θ that matches the included angle α between the second feed channel and the second discharge channel. The rotation angle θ of the rivet drop plate is based on the axis of the second feed channel and rotates toward the axis of the second discharge channel. A nail feed port detection sensor is provided on the second feed channel, and a nail outlet detection sensor is provided on the second discharge channel. Both the nail feed port detection sensor and the nail outlet detection sensor are electrically connected to the control mechanism.

[0019] As a preferred technical solution of the present invention, the cap-finding tightening mechanism includes a main body and a servo pressure mechanism, the servo pressure mechanism includes a servo pressure motor, a screw rod, a pre-tightening cylinder, a pre-tightening floating joint and a nozzle, the servo pressure motor is fixedly mounted on the bottom plate of the slide, the output end of the servo pressure motor is provided with the screw rod, the bottom plate of the slide is provided with a linear guide rail for the slide to slide, the slide is fixedly mounted on the end of the screw rod, when the servo pressure motor drives the screw rod to telescopic movement, the slide is driven to slide on the linear guide rail, the slide and the The pre-stressing cylinder is connected, the output end of the pre-stressing cylinder is provided with the pre-stressing floating joint, the nozzle is connected to the pre-stressing floating joint through a sliding plate, the input end of the nozzle is connected to the output end of the second discharge channel through a pipeline, and the nozzle is provided with a nozzle clamping cylinder electrically connected to the control mechanism, which is used to drive the clamping force of the nozzle; the main body is installed on the slide, and the main body includes a high-speed rotating motor and the rotating rod arranged at the output end of the high-speed rotating motor, and the rotating rod is penetrated into the nozzle to drive the rivet to rotate at high speed.

[0020] The present invention provides a quality monitoring method for a hot melt self-tapping drill riveting automatic nail feeding device, comprising the following steps:

[0021] S1. Start the hot-melt self-tapping drill rivet automatic nail feeding device: start the device, run the device without loading rivets, and observe whether the working status of each mechanism is normal;

[0022] S2. Obtaining performance parameters of the connected parts: including the thickness t and yield strength σ of the connected parts;

[0023] S3, setting initial processing parameters: including the torque M, the number of revolutions n, and the axial pressure N output by the cap-finding and tightening mechanism, wherein the number of revolutions n represents the number of rotations output by the cap-finding and tightening mechanism on the rivet per second;

[0024] S4, real-time monitoring and data acquisition: a pressure sensor and a rotation speed sensor electrically connected to the control mechanism are installed on the cap-finding and tightening mechanism, the pressure sensor monitors and collects the axial pressure N of the rotating rod in real time, the rotation speed sensor monitors and collects the rotation speed n of the rotating rod in real time, and the torque sensor monitors and collects the torque M of the rotating rod in real time, and feeds back the collected axial pressure N signal, rotation speed n signal and torque M signal to the control mechanism;

[0025] S5, adjustment and control: the control mechanism analyzes in real time whether the signal obtained by real-time monitoring in step S4 meets the drilling and riveting processing quality requirements, and makes corresponding adjustment operations on the relevant parameters of steps S2 to S3 according to the analysis results, and stops the adjustment operation after the drilling and riveting process meets the processing quality requirements;

[0026] The drilling and riveting processing quality requirements include that the length-to-thickness ratio k of the tapered cross section formed by the connected parts after drilling and riveting should meet the design requirements, wherein the length-to-thickness ratio k can be obtained by data fitting to satisfy the following relationship:

[0027]

[0028] Wherein, β1, β2, β3 are adjustment coefficients, wherein β1 and β2 are dimensionless, the unit of β3 is N, N is the axial pressure output by the cap-finding tightening mechanism, the unit is N, n is the number of revolutions output by the cap-finding tightening mechanism, dimensionless, σ is the yield strength of the connected part, the unit is MPa, t is the thickness of the connected part, the unit is mm, and M is the torque output by the cap-finding tightening mechanism, the unit is N·m;

[0029] The length-to-thickness ratio k of the tapered cross-section formed after the connected parts are drilled and riveted is directly related to the strength and stability of the riveted structure. A suitable length-to-thickness ratio k can ensure that the force of the rivet can be evenly distributed when it is under load to avoid stress concentration. Therefore, the present invention uses the length-to-thickness ratio k as a standard for quality control of drilling and riveting processing. By monitoring and controlling the length-to-thickness ratio k, the consistency and reliability of the riveted structure are ensured, thereby improving product quality.

[0030] Among them, the relationship between the aspect ratio k of the tapered section and various parameters is analyzed as follows:

[0031] The greater the axial pressure N, the greater the force applied by the rivet when penetrating the connected parts, causing the rivet to penetrate deeper, thereby increasing the length of the tapered section. On the other hand, the increase in the axial pressure N will cause the material to generate more heat during the drilling process, increasing the plasticity of the connected parts, thereby reducing the thickness of the tapered section. Therefore, the greater the length-to-thickness ratio k of the tapered section, the greater the axial pressure N is proportional to the length-to-thickness ratio k.

[0032] The greater the number of revolutions n, the faster the relative movement speed of the contact part between the rivet and the connected part, which means that the number of revolutions n of the rivet and the connected part increases in the same time, and the heat generated by friction increases, causing the material of the connected part to soften faster, making the material at the contact part in a hot-melt state, and the material at the bottom is squeezed out more. Most of the hot-melt material flows to the bottom of the drill hole to form a metal front, increasing the undercut of the joint, that is, the length of the tapered section, and reducing the remaining thickness at the bottom of the joint, that is, the thickness of the tapered section. Therefore, the greater the length-to-thickness ratio k of the tapered section, the greater the number of revolutions n and the length-to-thickness ratio k.

[0033] The larger the torque M, the easier and faster it is for the rivet to drill into the material, resulting in the accelerated formation process of the tapered section, causing the material to tear or over-extrusion near the tapered section. The length of the tapered section cannot be increased as expected, and the length may even be reduced due to the irregular deformation of the material. On the other hand, a larger torque will exert a greater torsional force on the material, causing the material to be more strongly extruded at the tapered section, and the thickness of the tapered section will increase. Therefore, the smaller the length-to-thickness ratio k of the tapered section, the number of revolutions n is inversely proportional to the length-to-thickness ratio k.

[0034] The larger the thickness t of the connected part, the thicker the material the rivet needs to penetrate to complete the riveting. Under the same processing parameter settings, the distribution and transfer of heat in the thicker material will affect the softening and deformation of the material. Due to the relative stability of the heat distribution, the degree and range of material softening are relatively stable, so that the length of the tapered section does not change much. On the other hand, when the thickness t of the connected part increases, more material is squeezed to the lower part of the drill hole under the axial pressure N of the rivet, resulting in an increase in the thickness of the tapered section. Therefore, the smaller the length-to-thickness ratio k of the tapered section, the thickness t of the connected part is inversely proportional to the length-to-thickness ratio k.

[0035] The greater the yield strength σ of the connected part, the greater the plastic deformation that the material can withstand without breaking under the same force. When the same processing parameters are set, the material's deformation resistance is enhanced and the rivet penetration depth is reduced, resulting in a decrease in the length of the tapered section. On the other hand, a larger yield strength σ will make the material more inclined to maintain its original shape when subjected to drilling and riveting. Under the same processing parameters, the material is not easily squeezed and deformed, and more material will accumulate at the tapered section, so the thickness of the tapered section will be greater. Therefore, the smaller the length-to-thickness ratio k of the tapered section, the yield strength σ of the connected part is inversely proportional to the length-to-thickness ratio k.

[0036] When the length-to-thickness ratio k is too large, it means that the total length of the tapered section is too large relative to the root thickness. This is caused by the tapered section being too long or the root thickness being too thin. From the perspective of force, when subjected to tension or pressure, the longer tapered section is more likely to bend and deform during the force transmission process. Because the longer part is relatively thin, its ability to resist bending is weak, and the connection strength, stability and rigidity of the overall structure are poor. Under the action of tension, the tapered section bends like a slender rod, resulting in uneven force transmission. Therefore, the overall strength of the structure with a tapered section with an excessively large length-to-thickness ratio k is weak. Since the tapered section is prone to bending and deformation, when subjected to a large load, damage may first occur at the tapered section, such as fracture or excessive deformation, thereby affecting the stability and reliability of the entire drill-and-rivet connection structure.

[0037] When the length-to-thickness ratio k is too small, it means that the total length of the tapered section is too small relative to the root thickness. This is caused by the tapered section being too short or the root thickness being too thick. From the perspective of force, this structure is not conducive to force dispersion. When the tapered section is too short and the root is too thick, the force cannot be effectively and evenly diffused to the connected parts through the tapered part during the transmission process. The force transmission area between the connected parts and the rivets is insufficient, resulting in stress concentration in the contact area between the root and the connected parts, and the force cannot be well dispersed through the tapered part. This will cause excessive local stress in the structure and reduce the fatigue life of the structure. Under the condition of long-term alternating loads, cracks are easily generated in the root stress concentration area, which in turn affects the strength, reliability and stability of the structure.

[0038] Therefore, a suitable length-to-thickness ratio k can balance the tensile strength and shear strength of the drilled rivet point and ensure the overall performance of the riveted structure. Secondly, a suitable length-to-thickness ratio k helps to increase the interference between the rivet and the connected parts, thereby improving the riveting quality, ensuring the structural stability and bearing capacity of the rivet after forming, and avoiding the reduction of the bearing capacity of the component due to local instability.

[0039] S6. Recording data and optimizing parameters: recording the data of the axial pressure N, number of revolutions n, torque M, aspect ratio k of the rotating rod and the corresponding dynamic adjustment during each drilling and riveting process, comprehensively analyzing the dynamic adjustment of several drilling and riveting points, and optimizing the initial processing parameters in step S3 according to the analysis results, and applying the optimized initial processing parameters to subsequent drilling and riveting work;

[0040] S7. Quality inspection: After the drilling and riveting operation is completed, the tensile strength and shear strength of the drilling and riveting point are evaluated in combination with the length-to-thickness ratio k of the tapered section of the drilling and riveting point, and the hidden defects of the drilling and riveting point are detected using non-destructive testing technology.

[0041] As a preferred technical solution of the present invention, the axial pressure N and the number of revolutions n in step S3 satisfy the following relationship:

[0042]

[0043]

[0044]

[0045] Where D is the diameter of the rivet tail, σ is the yield strength of the connected part, γ is the equilibrium coefficient, μ is the friction coefficient between the rivet and the connected part, m is the mass of the drilled riveted area of ​​the connected part, c is the specific heat capacity of the connected part, and ΔT is the heat of the connected part from the initial temperature T initial Heating to softening temperature T soft The temperature difference.

[0046] As a preferred technical solution of the present invention, the balance coefficient γ is determined by the temperature sensitivity of the connected part. The higher the temperature sensitivity of the connected part, the larger the balance coefficient γ. High temperature sensitivity represents that the melting point of the connected part is lower than 400°C, and the balance coefficient γ is 1.25-1.35; medium temperature sensitivity represents that the melting point of the connected part is between 400°C and 1000°C, and the balance coefficient γ is 1.15-1.25; low temperature sensitivity represents that the melting point of the connected part is higher than 1000°C, and the balance coefficient γ is 1.05-1.15.

[0047] As a preferred technical solution of the present invention, the aspect ratio k is the ratio of the total length L of the tapered section to the thickness b of the root of the tapered section.

[0048] In summary, compared with the prior art, the present invention has the following beneficial effects:

[0049] The hot-melt self-tapping drilling and riveting automatic nail feeding equipment of the present invention realizes the automatic storage, arrangement, transportation, flipping and drilling and riveting operations of rivets through the coordinated work of a series of precisely designed mechanisms, and is suitable for rivets of different specifications. The rivet silo mechanism is responsible for storing rivets and feeding the rivets into the vibration plate mechanism through the feeding belt. The vibration plate mechanism uses high-frequency and low-amplitude vibration to automatically arrange and orient the rivets, and then blows the rivets to the rivet flipping mechanism through the nail blowing mechanism. The rivet flipping mechanism adjusts the direction of the rivet so that the nail tail is in front and the nail cap is in the back, so as to facilitate the drilling and riveting operation of the cap-finding and tightening mechanism. During the whole process, the control mechanism monitors and adjusts the working status of each mechanism in real time to ensure that the rivets are sent to the drilling and riveting position in the correct posture and sequence, completing efficient and precise automated riveting operations;

[0050] The quality monitoring method of the present invention ensures that each link in the drilling and riveting process is in the best state by real-time monitoring of key parameters such as axial pressure, number of revolutions and torque, thereby effectively improving the connection quality. At the same time, the length-to-thickness ratio k of the tapered section formed after drilling and riveting is used as the quality control standard, and the processing parameters are adjusted in real time according to this standard, which not only ensures the accuracy of the riveting process, but also enhances the adaptability of the equipment to different materials and thicknesses, and improves its flexibility. By precisely controlling these key parameters, the tensile strength and shear strength of the connection can be ensured, thereby improving the consistency and reliability of the riveted structure. Compared with traditional methods, the present invention can more efficiently adapt to different processing requirements, reduce human operation errors, improve the stability of the processing process, and significantly improve the quality of the final product. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a schematic diagram of the rivet silo mechanism, the vibration plate mechanism and the rivet blowing mechanism of the present invention;

[0052] Figure 2 It is a schematic diagram of the rivet silo mechanism of the present invention;

[0053] Figure 3 is a schematic diagram of a nail blowing mechanism of the present invention;

[0054] Figure 4 It is a schematic diagram of the nail separation device of the present invention;

[0055] Figure 5 It is a schematic diagram of the rivet flipping mechanism of the present invention;

[0056] Figure 6 It is a schematic diagram of the combination of the cap-finding and tightening mechanism and the rivet flipping mechanism of the present invention;

[0057] Figure 7 It is a schematic diagram of the cap-finding and tightening mechanism of the present invention;

[0058] Figure 8It is a flow chart of a quality monitoring method of a hot melt self-tapping drill and riveting automatic nail feeding device of the present invention;

[0059] Fig. 9 is a graph of the aspect ratio k and the number of revolutions n of this embodiment;

[0060] Fig.10 It is a schematic diagram of the conical cross section formed after the connected parts are drilled and riveted;

[0061] In the figure, 1-rivet hopper mechanism, 11-hopper, 12-feeding belt, 13-reduction motor, 131-driving wheel, 132-transmission belt, 133-passive wheel, 14-support column, 2-vibration plate mechanism, 21-support frame, 22-vibration plate, 23-discharging pipe, 3-nailing blowing mechanism, 31-first feeding channel, 32-nailing device, 321-nailing cover plate, 322-nailing base, 3221-perforation, 323-nailing block, 324-baffle, 325-nailing cylinder, 326-floating joint, 327-first notch, 328-second notch, 329-buffer, 331-nailing blowing nozzle, 34-first discharging channel, 35-rivet detection sensor of the material channel, 36-nailing Detection sensor, 37-rivet blowing sensor, 38-vertical plate, 4-rivet turning mechanism, 41-second feed channel, 42-turning device, 421-rivet dropping tray, 422-stepping motor, 423-second nail blowing device, 43-second discharge channel, 44-nail inlet detection sensor, 45-nail outlet detection sensor, 5-cap-finding and tightening mechanism, 51-servo pressure mechanism, 511-servo pressure motor, 513-pre-tightening cylinder, 515-nozzle, 516-slide base plate, 517-linear guide, 518-slide, 519-slide plate, 520-pipeline, 521-nozzle clamping cylinder, 53-body, 531-high-speed rotating motor, 532-rotating rod, 6-workbench. DETAILED DESCRIPTION

[0062] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments given here are only used to illustrate and explain the present invention, and cannot be used to limit the present invention.

[0063] like Figures 1 to 7 As shown, a hot melt self-tapping drill rivet automatic nail feeding device of the present invention comprises a workbench 6, a rivet hopper mechanism 1, a vibration plate mechanism 2, a nail blowing mechanism 3, a rivet turning mechanism 4, a cap-finding and tightening mechanism 5 and a control mechanism (not shown in the figure);

[0064] The rivet silo mechanism 1 is used to store rivets, and includes a support column 14, a silo 11, a feeding belt 12, and a reduction motor 13. The support column 14 is fixed on the workbench 6. The top of the support column 14 is provided with a silo 11. The top of the silo 11 is a feed port, and a discharge port is provided on the side opposite to the feed port. The discharge port matches the input end of the feeding belt 12. The reduction motor 13 drives the feeding belt 12 to move, thereby driving the rivets on the feeding belt 12 to enter the vibration plate mechanism 2. The reduction motor 13 is electrically connected to the control mechanism;

[0065] The vibration plate mechanism 2 is used to arrange the rivets neatly, and includes a support frame 21, a vibration plate 22 and a pulse electromagnet (not shown in the figure). The support frame 21 is installed on the workbench 6, and a pulse electromagnet is installed on the support frame 21. The pulse electromagnet is electrically connected to the control mechanism. The vibration plate 22 is movably installed on the support frame 21 through an inclined spring sheet (not shown in the figure). A discharge pipe 23 is provided at the output end of the vibration plate 22, and the output end of the discharge pipe 23 is connected to the input end of the nail blowing mechanism 3;

[0066] The vibration disk mechanism 2 generates on-off power under the action of electric current through the pulse electromagnet, so that the vibration disk 22 vibrates in the vertical direction, and the inclined spring sheet drives the vibration disk 22 to perform torsional vibration around its vertical axis. The rivets in the vibration disk 22 rise along the spiral track provided in the vibration disk 22 due to this vibration. During the rising process, the rivets are screened or changed in posture through a series of tracks. The rivets can be uniformly transported to the rivet blowing mechanism 3 through the discharge pipe 23 according to the assembly requirements, thereby achieving the purpose of automatic, efficient arrangement and transportation of rivets.

[0067] The nail blowing mechanism 3 is used to blow the rivets to the rivet flipping mechanism 4. The nail blowing mechanism 3 includes a first feed channel 31, a nail separating device 32, a first nail blowing device and a first discharge channel 34. The input end of the first feed channel 31 is connected to the output end of the discharge pipe 23. The nail separating device 32 is arranged between the output end of the first feed channel 31 and the input end of the first discharge channel 34. A nail separating cylinder 325 is arranged in the nail separating device 32, which is used as a power source for nail separating operation. The first nail blowing device is arranged on one side of the nail separating device 32 and opposite to the first discharge channel 34. The first nail blowing device is provided with a nail blowing nozzle 331. The nail blowing nozzle 331 is embedded in the output end of the nail separating device 32 and is coaxially aligned with the output end of the nail separating device 32 and the input end of the first discharge channel 34, and is used to blow the rivets in the output end of the nail separating device 32 to the first discharge channel 34. The output end of the first discharge channel 34 is connected to the input end of the rivet flipping mechanism 4, and the rivets are transported to the rivet flipping mechanism 4 for flipping operation.

[0068] The first feeding channel 31 is connected to the output end of the discharge pipe 23 and the input end of the nail separation device 32, and is used to transport the rivets neatly arranged in the vibration disk mechanism 2 to the nail separation device 32 for nail separation operation. The rivets at the front end of the rivet row are separated by the nail separation cylinder 325, so that they enter the first nail blowing device alone to complete the nail blowing operation. The first nail blowing device is fixed at the lower side of the nail separation device 32 to ensure that the nail blowing nozzle 331 is aligned with the outlet of the nail separation device 32, and the nail blowing direction is consistent with the rivet conveying path to avoid air flow deviation. The nail blowing nozzle 331 is directly embedded in the outlet of the nail separation device 32 to form a closed air path to prevent the rivets from being scattered or stuck during the blowing process. The blown rivets are transported along the first discharge channel 34 to the rivet flipping mechanism 4 for flipping operation.

[0069] The rivet flipping mechanism 4 is used to turn the direction of the rivet. The second feed channel 41, the flipping device 42 and the second discharge channel 43 are connected in sequence between the input end and the output end of the rivet flipping mechanism 4. The input end of the second feed channel 41 is connected to the output end of the first discharge channel 34. The flipping device 42 includes a rivet drop tray 421, a stepping motor 422 and a second nail blowing device 423. The rivet drop tray 421 is arranged between the output end of the second feed channel 41 and the input end of the second discharge channel 43. The rivet drop tray 421 is connected to the rotating shaft of the stepper motor 422, and the stepper motor 422 drives the rivet drop tray 421 to rotate at an angle θ to complete the flipping operation of the rivet posture. The output end of the second nail blowing device 423 cooperates with the input end of the rivet drop tray 421 after the rotation angle θ, and is used to blow the rivets that have completed the flipping operation out of the second discharge channel 43. The output end of the second discharge channel 43 is connected to the input end of the cap-finding and tightening mechanism, and the flipped rivets are transported to the cap-finding and tightening mechanism for drilling and riveting operations.

[0070] A rotating rod 532 is provided in the cap-finding and tightening mechanism 5 , and the cap-finding and tightening mechanism 5 drives the rotating rod 532 to provide a rotational torque and an axial pressure to the rivet so as to pierce the connected parts, thereby completing the drilling and riveting operation.

[0071] Furthermore, a driving wheel 131 is provided at the output end of the reduction motor 13 , and the reduction motor 13 drives the driving wheel 131 to rotate, and the driving wheel 131 drives a driven wheel 133 disposed on the feeding belt 12 to rotate through a transmission belt 132 .

[0072] Furthermore, a vibration disk sorting track (not shown) is fixedly connected to the inner surface wall of the vibration disk 22, and the output end of the vibration disk sorting track is connected to the input end of the discharge pipe.

[0073] Furthermore, a feed channel rivet detection sensor 35 is provided on the first feed channel 31, a split nail detection sensor 36 is provided on the split nail device 32, and a rivet blow-out sensor 37 is provided on the first nail blowing device. The split nail cylinder 325, the nail blowing nozzle, the feed channel rivet detection sensor 35, the split nail detection sensor 36 and the rivet blow-out sensor 37 are all electrically connected to the control mechanism.

[0074] The nail separation device 32 includes a nail separation cover plate 321, a nail separation base 322, a nail separation block 323 and a baffle plate 324. The nail separation cover plate 321 is arranged on the top of the nail separation base 322, and the baffle plate 324 is arranged on the left and right ends of the nail separation base 322. The nail separation cover plate 321, the nail separation base 322 and the baffle plate 324 enclose a chamber for accommodating the nail separation block 323. The nail separation cylinder 325 is connected to the nail separation block 323 through a floating joint 326 to drive the nail separation block 323 to slide left and right in the chamber. The nail separation base 322 is installed on the vertical plate 38. The nail separation cover plate 321 is connected to the first feed channel 31. A first notch 327 for transmitting rivets is provided at the split nail block 323, a second notch 328 matched with the first notch 327 is provided on the split nail block 323, and is used to receive rivets from the discharge pipe 23, a buffer 329 is provided on the baffle 324, the first discharge channel 31 is provided on the split nail cover plate 321, and receives rivets from the split nail block 323; a through hole 3221 is provided on the split nail base 322, and the through hole 3221 is aligned with the input end of the first discharge channel 34, one end of the nail blowing nozzle 331 is connected to the through hole 3221 through an air pipe, and the other end is connected to an air source (not shown in the figure), and the air source provides power for the nail blowing operation.

[0075] The material channel rivet detection sensor 35 is used to detect whether there are rivets on the first feed channel 31. When the material channel rivet detection sensor 35 cannot detect the existence of rivets, the control mechanism will control the vibration disk mechanism 2 to transfer the rivets into the nail separation device 32. When the nail separation detection sensor 36 in the nail separation device 32 detects that a rivet has entered, the control mechanism starts the nail separation cylinder 325 to push the rivet to the first nail blowing device, and the first nail blowing device blows the rivet to the rivet flipping mechanism 4. When the rivet blowing sensor 37 detects that the rivet has been blown out, the control mechanism controls the nail separation cylinder 325 to return to its original position and wait for the next cycle. Specifically, the nail separation operation is performed by the second notch 328 on the nail separation block 323 receiving the rivet from the discharge pipe 23. After the reception is completed, the nail separation cylinder 325 drives the floating joint 326 to contract, driving the nail separation block 323 and the rivet to slide in the chamber until the second notch 328 slides to the input end of the first discharge channel 34. At this time, the nail separation cylinder 325 stops the floating joint 326, so that the rivet, the second notch 328, the perforation and the input end of the first discharge channel 34 are in the same straight line. At this time, the air source works, and the rivet in the second notch 328 is blown into the first discharge channel 34 through the nail blowing nozzle, completing the nail blowing operation.

[0076] Furthermore, the stepper motor 422 drives the rivet dropping tray 421 to rotate at an angle θ, which matches the angle α between the second feed channel 41 and the second discharge channel 43. The rotation angle θ of the rivet dropping tray 421 is based on the axis of the second feed channel 41 and rotates toward the axis of the second discharge channel 43. The second feed channel 41 is provided with a nail feed port detection sensor 44, and the second discharge channel 43 is provided with a nail feed port detection sensor 45. The nail feed port detection sensor 44 and the nail discharge port detection sensor 45 are both electrically connected to the control mechanism.

[0077] In this embodiment, the angle α between the second feed channel 41 and the second discharge channel 43 is 90°. When the rivet flipping mechanism 4 is not working, the rivet drop tray 421 is coaxial with the second feed channel 41 and smoothly receives the rivets from the nail blowing mechanism 3. When the nail inlet detection sensor 44 detects that there are rivets in the second feed channel 41, the rivets enter the flipping device 42 with the nail cap in front and the nail tail in the back. At this time, the nail inlet detection sensor 44 feeds back the detection data to the control mechanism, and the control mechanism drives the stepper motor 422 to rotate at an angle θ, thereby driving the rivet drop tray 421 and the rivet drop tray 421 to rotate at an angle θ. The rivet in 1 rotates from the axis of the second feed channel 41 to the axis of the second discharge channel 43 by an angle θ, wherein the angle θ is 90°, so that the posture of the rivet is changed to that the rivet tail is in front and the rivet cap is in the back. At this time, the rivet and the rivet drop tray 421 are coaxial with the second discharge channel 43, and the flipping operation is completed. The control mechanism drives the second rivet blowing device 423 to blow the rivet that has completed the flipping operation away from the second discharge channel 43. When the rivet outlet detection sensor 45 on the second discharge channel 43 detects that the rivet has been blown out, the control mechanism drives the stepping motor 422 to reset and wait for the next cycle.

[0078] Furthermore, the cap-finding and tightening mechanism 5 includes a body 53 and a servo pressure mechanism 51, the servo pressure mechanism 51 includes a servo pressure motor 511, a screw (not shown in the figure), a pre-pressing cylinder 513, a pre-pressing floating joint (not shown in the figure) and a nozzle 515, the servo pressure motor 511 is fixedly mounted on a slide base plate 516, a screw is provided at the output end of the servo pressure motor 511, a linear guide 517 is provided on the slide base plate 516 for the slide 518 to slide, the slide 518 is fixedly mounted on the end of the screw, when the servo pressure motor 511 drives the screw to telescope, the slide 518 is driven to slide on the linear guide 517, and the slide 5 18 is connected to the pre-pressing cylinder 513, the output end of the pre-pressing cylinder 513 is provided with a pre-pressing floating joint, the nozzle 515 is connected to the pre-pressing floating joint through a sliding plate 519, the input end of the nozzle 515 is connected to the output end of the second discharge channel 41 through a pipe 520, and the nozzle 515 is provided with a nozzle clamping cylinder 521 electrically connected to the control mechanism, which is used to drive the clamping force of the nozzle 515; the main body 53 is installed on the slide 518, and the main body 53 includes a high-speed rotating motor 531 and a rotating rod 532 arranged at the output end of the high-speed rotating motor 531, and the rotating rod 532 is penetrated into the nozzle 515 to drive the rivet to rotate at high speed.

[0079] The working principle of the hot-melt self-tapping drilling and riveting automatic nail feeding equipment of the present invention is as follows: the rivet hopper mechanism 1 is responsible for storing rivets, and feeds the rivets into the vibration disk mechanism 2 through the feeding belt 12, the vibration disk mechanism 2 uses vibration to automatically arrange and orient the rivets, and then transports the rivets to the nail blowing mechanism 3 through the discharge pipe 23, the nail blowing mechanism 3 further blows the rivets to the rivet flipping mechanism 4, and reverses the direction to ensure that the rivet enters the cap-finding and tightening mechanism 5 with the correct posture, and the cap-finding and tightening mechanism 5 finally applies high-speed rotational torque and axial pressure to the rivet, the rotational torque causes the rivet tail to rub with the connected part at high speed to generate heat to soften the connected part, and the axial pressure causes the rivet to pierce the connected part and form a conical extension ring around the rivet until the rivet cap contacts the upper material and encounters a huge surface friction force and stops, at which time the special thread on the rivet tightly connects the rivet and the connected part together to complete the drilling and riveting operation on the connected part. During the entire process, the control mechanism monitors each key link in real time to ensure the correct delivery and precise positioning of the rivets, thereby achieving efficient and automated riveting operations.

[0080] like Figures 8 to 10 As shown, a quality monitoring method of a hot melt self-tapping drill rivet automatic nail feeding device of the present invention comprises the following steps:

[0081] S1. Start the hot melt self-tapping drill rivet automatic nail feeding equipment: Start the equipment, run the equipment without loading rivets, and observe whether the working status of each mechanism is normal;

[0082] S2. Obtaining performance parameters of the connected parts: including the thickness t and yield strength σ of the connected parts;

[0083] S3, setting initial processing parameters: including the torque M, the number of revolutions n, and the axial pressure N output by the cap-finding and tightening mechanism 5, where the number of revolutions n represents the number of rotations output by the cap-finding and tightening mechanism 5 on the rivet per second;

[0084] S4, real-time monitoring and data collection: a pressure sensor and a rotation speed sensor electrically connected to the control mechanism are installed on the cap-finding and tightening mechanism 5, the pressure sensor monitors and collects the axial pressure N of the rotating rod in real time, the rotation speed sensor monitors and collects the rotation speed n of the rotating rod in real time, and the torque sensor monitors and collects the torque M of the rotating rod in real time, and feeds back the collected axial pressure N signal, rotation speed n signal and torque M signal to the control mechanism;

[0085] S5, adjustment and control: the control mechanism analyzes in real time whether the signal obtained by real-time monitoring in step S4 meets the drilling and riveting processing quality requirements, and makes corresponding adjustment operations on the relevant parameters of steps S2 to S3 according to the analysis results, and stops the adjustment operation after the drilling and riveting process meets the processing quality requirements;

[0086] The quality requirements for drilling and riveting include that the length-to-thickness ratio k of the tapered section formed by the connected parts after drilling and riveting should meet the design requirements. The length-to-thickness ratio k can be obtained by data fitting to satisfy the following relationship:

[0087]

[0088] Wherein, β1, β2, β3 are adjustment coefficients, wherein β1 and β2 are dimensionless, the unit of β3 is N, N is the axial pressure output by the cap-finding tightening mechanism 5, the unit is N, n is the number of revolutions output by the cap-finding tightening mechanism 5, dimensionless, σ is the yield strength of the connected part, the unit is MPa, t is the thickness of the connected part, the unit is mm, M is the torque output by the cap-finding tightening mechanism 5, the unit is N·m; the aspect ratio k is the ratio of the total length L of the tapered section to the thickness b of the root of the tapered section;

[0089] S6. Recording data and optimizing parameters: Recording the data of the axial pressure N, number of revolutions n, torque M, length-to-thickness ratio k of the rotating rod and the corresponding dynamic adjustment during each drilling and riveting process, comprehensively analyzing the dynamic adjustment of several drilling and riveting points, and optimizing the initial processing parameters in step S3 according to the analysis results, and applying the optimized initial processing parameters to subsequent drilling and riveting work;

[0090] S7. Quality inspection: After the drilling and riveting operation is completed, the tensile strength and shear strength of the drilling and riveting point are evaluated based on the length-to-thickness ratio k of the tapered section of the drilling and riveting point, and the hidden defects of the drilling and riveting point are detected using non-destructive testing technology.

[0091] like Fig. 9 As shown, in this embodiment, a rivet with a nail tail diameter D of 3mm is used to connect and fasten two aluminum alloy plates by hot-melt self-tapping drilling and riveting. The thickness of the upper plate is 2.0mm, and the thickness of the lower plate is 2.5mm. Their yield strength is 140MPa. The upper plate is provided with a through hole for inserting the rivet. The diameter of the through hole is larger than the diameter of the rivet body and smaller than the diameter of the rivet cap. Therefore, when the two aluminum alloy plates need to be drilled and riveted, it is only necessary to rivet the rivet on the lower plate with a thickness of 2.5mm. That is, the thickness t of the connected part in this embodiment is 2.5mm. According to the material of the plate, its melting point is about 550℃, between 400℃ and 1000℃, which is medium temperature sensitive. Therefore, the balance coefficient γ is taken as 1.18. The calculation formula of the axial pressure N can be used to obtain the minimum axial pressure N of this embodiment is 838N, which satisfies the following relationship:

[0092]

[0093] Combined with processing experience, the axial pressure N in this implementation is 1200N.

[0094] Since the temperature of aluminum alloy at room temperature is 20°C, that is, the initial temperature T initial The softening temperature is 20℃, T soft The melting temperature is 550℃, and the connected parts are initial Heating to softening temperature T soft The temperature difference ΔT is 550℃-20℃=530℃, where the specific heat capacity of aluminum alloy is 0.88×10 3 J / (kg·℃), the friction coefficient μ between the aluminum alloy plate and the rivet is 0.22. According to the simulation model analysis, the mass m of the drilled and riveted area of ​​the connected part is 0.00053kg. Therefore, under the above conditions, the number of revolutions per second n required to complete the drilling and riveting work can be obtained to satisfy the following relationship:

[0095]

[0096]

[0097] Combined with processing experience, the torque M output by the cap-finding tightening mechanism 5 is set to 12N·m. By adjusting the number of revolutions per second n output by the cap-finding tightening mechanism 5, the length-to-thickness ratio k data corresponding to each set of revolutions n are obtained. The length-to-thickness ratio k of the conical section formed by the connected parts after drilling and riveting can be accurately measured by three-dimensional scanning measurement technology, and then the length-to-thickness ratio k is obtained by software analysis. By fitting several groups of representative data, the adjustment coefficients β1, β2, and β3 are 8.414, 17.80, and 91N, respectively. The length-to-thickness ratio k satisfies the following relationship:

[0098]

[0099] Since the length-to-thickness ratio k should not be too large or too small, otherwise the overall strength of the structure will be weak or the stress will be concentrated at the root to cause cracks. Therefore, the value range of the length-to-thickness ratio k is set to be between 7.385 and 7.620. According to the relationship between the length-to-thickness ratio k and the number of revolutions n, the corresponding value range of the number of revolutions n can be obtained to be between 100 and 120, which meets the requirement of the minimum number of revolutions n.

[0100] It should be understood that the above embodiments are one or more embodiments of the present invention. There are many other embodiments and variations thereof based on the present invention. For example, when the connected plates have no openings or through holes, that is, rivets are required to drill and rivet two plates at the same time, then when calculating the number of revolutions n and the axial pressure N output by the cap-finding and tightening mechanism 5, the yield strength σ and specific heat capacity c of the connected parts take the larger values ​​of the two plates, the mass m of the drilling and riveting area takes the sum of the masses of the heat-softened areas of the two plates during the drilling and riveting process, and the balance coefficient γ is determined by the less temperature-sensitive of the two plates. The deformation and modifications made by ordinary technicians in this industry through the present invention when no pioneering innovations are made are all within the scope of protection of the present invention.

Claims

1. A hot melt self-tapping drill riveting automatic nail feeding device, characterized in that: It includes a rivet silo mechanism, a vibration plate mechanism, a rivet blowing mechanism, a rivet turning mechanism, a cap-finding and tightening mechanism, and a control mechanism; The rivet silo mechanism is used to store rivets, and includes an open silo, a feeding belt and a reduction motor. The silo is provided with a discharge port, and the discharge port cooperates with the input end of the feeding belt. The reduction motor drives the feeding belt to move, thereby driving the rivets on the feeding belt to enter the vibration plate mechanism. The reduction motor is electrically connected to the control mechanism. The vibration plate mechanism is used to arrange the rivets neatly, and comprises a support frame, a vibration plate and a pulse electromagnet. The pulse electromagnet is mounted on the support frame, and the pulse electromagnet is electrically connected to the control mechanism. The vibration plate is movably mounted on the support frame through an inclined spring sheet. A discharge pipe is provided at the output end of the vibration plate, and the output end of the discharge pipe is connected to the input end of the rivet blowing mechanism. The nail blowing mechanism is used to blow rivets to the rivet flipping mechanism. A first feed channel, a nail separating device, a first nail blowing device and a first discharge channel are sequentially connected between the input end and the output end of the nail blowing mechanism. The input end of the first feed channel is connected to the output end of the discharge pipe. A nail separating cylinder is provided in the nail separating device, which is used as a power source for nail separating operation. A nail blowing nozzle is provided in the first nail blowing device, which is used to blow rivets in the nail separating device to the first discharge channel. The output end of the first discharge channel is connected to the input end of the rivet flipping mechanism to transport the rivets to the rivet flipping mechanism for flipping operation. The first feed channel is provided with a channel rivet detection sensor, the nail separation device is provided with a nail separation detection sensor, the first nail blowing device is provided with a rivet blowing sensor, and the nail separation cylinder, the nail blowing nozzle, the feed channel rivet detection sensor, the nail separation detection sensor and the rivet blowing sensor are all electrically connected to the control mechanism; The nail separation device comprises a nail separation cover plate, a nail separation base, a nail separation block and a baffle plate, wherein the nail separation cover plate is arranged on the top of the nail separation base, and the baffle plate is arranged on the left and right ends of the nail separation base, and a chamber for accommodating the nail separation block is formed by the nail separation cover plate, the nail separation base and the baffle plate, and the nail separation cylinder is connected to the nail separation block through a floating joint to drive the nail separation block to slide back and forth in the chamber, and the nail separation base is installed on the vertical plate, and a first notch for transmitting rivets is provided at the connection between the nail separation cover plate and the first feed channel, and a second notch adapted to the first notch is provided on the nail separation block for receiving rivets from the discharge pipe, and buffers are provided on the baffle plate, and the first discharge channel is provided on the nail separation cover plate and receives rivets from the nail separation block; a through hole is provided on the nail separation base, and the through hole is aligned with the input end of the first discharge channel, and one end of the nail blowing nozzle is connected to the through hole through an air pipe, and the other end is connected to an air source, and the air source provides power for the nail blowing operation; The rivet flipping mechanism is used to reverse the direction of the rivet, and a second feed channel, a flipping device and a second discharge channel are connected in sequence between the input end and the output end of the rivet flipping mechanism, the input end of the second feed channel is connected to the output end of the first discharge channel, the flipping device comprises a rivet dropping tray, a stepper motor and a second nail blowing device, the rivet dropping tray is arranged between the output end of the second feed channel and the input end of the second discharge channel, the rivet dropping tray is connected to the rotating shaft of the stepper motor, and the rivet dropping tray is driven by the stepper motor to rotate an angle θ to complete the flipping operation of the rivet posture, the output end of the second nail blowing device cooperates with the input end of the rivet dropping tray after the rotation angle θ, and is used to blow the rivet that has completed the flipping operation out of the second discharge channel, the output end of the second discharge channel is connected to the input end of the cap-finding and tightening mechanism, and the flipped rivet is transported to the cap-finding and tightening mechanism for drilling and riveting operation; The cap-finding and tightening mechanism is used to provide rotational torque and axial pressure to the rivet to pierce the connected parts and complete the drilling and riveting operation; The cap-finding tightening mechanism includes a main body and a servo pressure mechanism, and the servo pressure mechanism includes a servo pressure motor, a screw rod, a pre-tightening cylinder, a pre-tightening floating joint and a nozzle. The servo pressure motor is fixedly mounted on the slide base plate, and the output end of the servo pressure motor is provided with the screw rod. The slide base plate is provided with a linear guide rail for the slide to slide, and the slide is fixedly mounted on the end of the screw rod. When the servo pressure motor drives the screw rod to telescopically move, the slide is driven to slide on the linear guide rail. The slide is connected to the pre-tightening cylinder, and the output end of the pre-tightening cylinder is provided with the pre-tightening floating joint. The nozzle is connected to the pre-tightening floating joint through a sliding plate, and the input end of the nozzle is connected to the output end of the second discharge channel through a pipeline. The nozzle is provided with a nozzle clamping cylinder electrically connected to the control mechanism for driving the clamping force of the nozzle. The main body is mounted on the slide, and the main body comprises a high-speed rotating motor and a rotating rod arranged at the output end of the high-speed rotating motor, and the rotating rod is penetrated into the nozzle to drive the rivet to rotate at a high speed.

2. The automatic nail feeding device for hot melt self-tapping drill rivet according to claim 1 is characterized by: It also includes a fixed frame, and the rivet hopper mechanism, the vibration disk mechanism and the nail blowing mechanism are all installed on the fixed frame; a driving wheel is provided at the output end of the reduction motor, and the reduction motor drives the driving wheel to rotate, and the driving wheel drives the passive wheel arranged on the feeding belt to rotate through a transmission belt.

3. The automatic nail feeding device for hot melt self-tapping drill rivet according to claim 1 is characterized by: The inner surface wall of the vibration plate is fixedly connected with a vibration plate sorting track, and the output end of the vibration plate sorting track is connected with the input end of the discharge rail pipe.

4. The automatic nail feeding device for hot melt self-tapping drill rivet according to claim 1 is characterized by: The angle θ at which the stepper motor drives the rivet drop plate to rotate matches the included angle α between the second feed channel and the second discharge channel. The rotation angle θ of the rivet drop plate is based on the axis of the second feed channel and rotates toward the axis of the second discharge channel. A nail inlet detection sensor is provided on the second feed channel, and a nail outlet detection sensor is provided on the second discharge channel. Both the nail inlet detection sensor and the nail outlet detection sensor are electrically connected to the control mechanism.

5. A quality monitoring method for a hot melt self-tapping drill rivet automatic nail feeding device, used for the hot melt self-tapping drill rivet automatic nail feeding device according to claim 1, characterized in that The following steps are involved: S1. Start the hot-melt self-tapping drill rivet automatic nail feeding device: start the device, run the device without loading rivets, and observe whether the working status of each mechanism is normal; S2. Obtaining performance parameters of the connected parts: including the thickness t and yield strength σ of the connected parts; S3, setting initial processing parameters: including the torque M, the number of revolutions n, and the axial pressure N output by the cap-finding and tightening mechanism, wherein the number of revolutions n represents the number of rotations output by the cap-finding and tightening mechanism on the rivet per second; S4, real-time monitoring and data acquisition: a pressure sensor and a rotation speed sensor electrically connected to the control mechanism are installed on the cap-finding and tightening mechanism, the pressure sensor monitors and collects the axial pressure N of the punch rod in real time, the rotation speed sensor monitors and collects the rotation speed n of the punch rod in real time, and the torque sensor monitors and collects the torque M of the punch rod in real time, and feeds back the collected axial pressure N signal, rotation speed n signal and torque M signal to the control mechanism; S5, adjustment and control: the control mechanism analyzes in real time whether the signal obtained by real-time monitoring in step S4 meets the drilling and riveting processing quality requirements, and makes corresponding adjustment operations on the relevant parameters of steps S2 to S3 according to the analysis results, and stops the adjustment operation after the drilling and riveting process meets the processing quality requirements; The drilling and riveting processing quality requirements include that the length-to-thickness ratio k of the tapered cross section formed by the connected parts after drilling and riveting should meet the design requirements, wherein the length-to-thickness ratio k can be obtained by data fitting to satisfy the following relationship: Wherein, β1, β2, β3 are adjustment coefficients, wherein β1 and β2 are dimensionless, the unit of β3 is N, N is the axial pressure output by the cap-finding tightening mechanism, the unit is N, n is the number of revolutions output by the cap-finding tightening mechanism, dimensionless, σ is the yield strength of the connected part, the unit is MPa, t is the thickness of the connected part, the unit is mm, and M is the torque output by the cap-finding tightening mechanism, the unit is N·m; S6. Recording data and optimizing parameters: recording the data of the axial pressure N, number of revolutions n, torque M, aspect ratio k of the punch rod and the corresponding dynamic adjustment during each drilling and riveting process, comprehensively analyzing the dynamic adjustment of several drilling and riveting points, and optimizing the initial processing parameters in step S3 according to the analysis results, and applying the optimized initial processing parameters to subsequent drilling and riveting work; S7. Quality inspection: After the drilling and riveting operation is completed, the tensile strength and shear strength of the drilling and riveting point are evaluated in combination with the length-to-thickness ratio k of the tapered section of the drilling and riveting point, and the hidden defects of the drilling and riveting point are detected using non-destructive testing technology.

6. The quality monitoring method of a hot melt self-tapping drill rivet automatic nail feeding device according to claim 5 is characterized in that: In step S3, the axial pressure N and the number of revolutions n satisfy the following relationship: Where D is the diameter of the rivet tail, σ is the yield strength of the connected part, γ is the equilibrium coefficient, μ is the friction coefficient between the rivet and the connected part, m is the mass of the drilled riveted area of ​​the connected part, c is the specific heat capacity of the connected part, and ΔT is the heat of the connected part from the initial temperature T initial Heating to softening temperature T soft The temperature difference.

7. The quality monitoring method of a hot melt self-tapping drill rivet automatic nail feeding device according to claim 6 is characterized in that: The balance coefficient γ is determined by the temperature sensitivity of the connected component. The higher the temperature sensitivity of the connected component, the larger the balance coefficient γ. High temperature sensitivity represents that the melting point of the connected component is lower than 400°C, and the balance coefficient γ is 1.25-1.35; medium temperature sensitivity represents that the melting point of the connected component is between 400°C and 1000°C, and the balance coefficient γ is 1.15-1.25; low temperature sensitivity represents that the melting point of the connected component is higher than 1000°C, and the balance coefficient γ is 1.05-1.

15.

8. The quality monitoring method of a hot melt self-tapping drill rivet automatic nail feeding device according to claim 5 is characterized by: The aspect ratio k is the ratio of the total length L of the tapered section to the thickness b of the root of the tapered section.

Images