A magnetic resistance type nail shooting and punching equipment

Abstract

This utility model relates to the field of riveting equipment, specifically a magnetic reluctance nail-shooting riveting device, comprising: a housing assembly and a buffer assembly; a mass block and an impact assembly sequentially arranged within the housing assembly along its length; the impact assembly includes: a launching tube, a projectile, an impact head assembly, a coil assembly, and a nail; an electromagnet is mounted on the mass block, and the electromagnet and the coil assembly are connected via a switch and a power supply; the electromagnet is used to attract or detach the projectile; the coil assembly is sleeved on the launching tube and generates a magnetic field when energized, driving the projectile to move within the launching tube to impact the impact head assembly, and under the reaction force of the impact, the mass block recoils along the guide assembly; the buffer assembly is disposed between the coil assembly and the top inner wall of the housing assembly to absorb the recoil energy of the mass block. This device effectively reduces the applied voltage, lowers the power requirements of the control power cabinet, and facilitates the miniaturization and energy saving of the equipment.

Description

Technical Field

[0001] This utility model relates to the field of riveting equipment, specifically to a magnetic reluctance nail shooting and riveting equipment. Background Technology

[0002] With the development of the automotive industry, automakers, especially those producing new energy vehicles, are focusing on lightweighting vehicle structures to reduce energy consumption and improve performance. Currently, automakers commonly use lightweight materials such as aluminum alloys, magnesium alloys, high-strength steel, and composite materials in their body structures. The application of these new materials also brings new challenges to connection technologies. For example, aluminum alloy spot welding requires a larger current and longer welding time compared to steel due to aluminum's low electrical resistance and high thermal conductivity, and the weld quality is difficult to guarantee. However, nail-shot connection technology, as a highly efficient connection technology that allows for unidirectional connection, high strength, and low cost, effectively solves these problems. This technology uses compressed gas to drive a piston pin at high speed, impacting the nail and causing it to penetrate multiple layers of sheet metal at high speed. The connection is achieved through an interlocking structure formed by the plastic deformation of the nail and the sheet metal. Nail-shot connection technology eliminates the need for drilling and offers fast installation, resulting in high production efficiency. It is currently being used in the body-in-white manufacturing of many vehicle models.

[0003] Currently, pneumatic nail guns are commonly used for nail installation, which places stringent requirements on equipment sealing. Furthermore, the pneumatic loading method struggles to precisely adjust the loading energy and impact waveform. Electromagnetic loading technology can precisely regulate the loading energy and impact waveform; however, traditional inductive electromagnetic loading relies on the electromagnetic repulsion between the loading coil and the secondary coil. The eddy current effect between the primary and secondary coils generates significant heat, reducing energy conversion efficiency and making the riveting force more prone to thermal decay, which is detrimental to long-term operation. In future applications requiring higher energy density and high-strength sheet metal nail connections, this will hinder the miniaturization and compactness of the equipment.

[0004] Therefore, there is a need to provide a magnetic reluctance nail-shooting and riveting device to solve the above problems. Utility Model Content

[0005] To address the problems of traditional induction electromagnetic loading methods that rely on the electromagnetic repulsion between the loading coil and the secondary coil for loading, and the eddy current effect between the primary and secondary coils causing a large amount of heat to be generated, which reduces the energy conversion efficiency of the loading to a certain extent and makes the riveting force of the equipment more prone to thermal decay, thus hindering the long-term operation of the equipment, this utility model provides a magnetic reluctance nail shooting and riveting device to solve the existing problems.

[0006] The present invention relates to a magnetic reluctance nail-shooting and riveting device, which adopts the following technical solution, including: The outer casing assembly includes a mass block and an impact component arranged sequentially within the outer casing assembly along its length. The impact assembly includes: a launching tube, coaxially mounted within the outer casing assembly, with a projectile slidably mounted therein; an impact head assembly slidably mounted within a cavity formed between the launching port of the launching tube and the head of the outer casing assembly, with a nail connected to one end of the impact head assembly extending out of the outer casing assembly; an electromagnet mounted on a mass block, the electromagnet and a coil assembly connected via a switch and a power supply, the electromagnet being used to attract or detach from the projectile; and a coil assembly mounted on the launching tube, used to generate a magnetic field when energized to drive the projectile to move within the launching tube to impact the impact head assembly, and under the reaction force of the impact, to drive the mass block to recoil along the guide assembly. It also includes a buffer assembly, which is disposed between the inner rear wall of the coil assembly and the housing assembly, for absorbing the recoil energy of the mass block.

[0007] A further technical solution of this utility model is as follows: the outer shell assembly includes a cylindrical body, both ends of which are sealed by end caps. One end cap is provided with a handle, and the other end cap is provided with a protrusion. The side of the protrusion facing the launching tube is a circular cavity. An installation hole for the impact head assembly is opened on the end face of the protrusion. The launching end of the launching tube is fixed on the inner side of the end cap with the installation hole. The launching port of the launching tube and the circular cavity of the protrusion form the cavity of the impact head assembly.

[0008] A further technical solution of this utility model is as follows: the coil assembly includes: a coil frame, which is sleeved on the transmitting tube, and a coil is wound on its outer ring, wherein the coil is connected to the power supply.

[0009] A further technical solution of this utility model is as follows: the coil frame includes a cylindrical body with a limiting flange at its end, wherein the coil is wound on the cylindrical body between the two limiting flanges.

[0010] A further technical solution of this utility model is as follows: the mass block is a hollow shell structure, which is sleeved on the launching tube, and a connecting flange is provided on one end of the sleeved on the launching tube. The connecting flange is connected to the limiting flange of the coil frame. A mounting sleeve for installing a buffer assembly is provided on the side of the connecting flange away from the limiting flange. The electromagnet is fixed inside the hollow shell.

[0011] A further technical solution of this utility model is as follows: The buffer assembly includes: a buffer, which is installed inside the mounting sleeve, and the end of the buffer facing away from the mounting sleeve is connected to a first adjusting seat through a connecting rod. A first screw is provided on the first adjusting seat, and the first screw passes through the end face of the outer shell assembly and is connected to a first nut.

[0012] A further technical solution of this utility model is: a return spring is also provided between the end of the mass block away from the launch tube and the inner wall of the outer shell assembly.

[0013] A further technical solution of this utility model is: the impact head assembly includes: an impact head, on which a mounting head for mounting nails is threadedly connected.

[0014] A further technical solution of this utility model is as follows: the guide assembly includes a guide rod, one end of which is fixed to the bottom end face of the outer shell assembly, and the other end of which is provided with a second adjusting seat. A second screw is provided on the second adjusting seat, and a second nut is provided at the end of the second screw that extends out of the top of the outer shell assembly. The middle part of the guide rod is connected by a linear bearing, a limiting flange, and a connecting flange.

[0015] A further technical solution of this utility model is that an elastic washer is provided between the end faces of the electromagnet and the transmitting tube.

[0016] The beneficial effects of this utility model are: 1. This novel device differs significantly from traditional induction electromagnetic loading devices in the mechanism of electromagnetic force generation. The reluctance electromagnetic loading principle utilized in this novel reluctance-type nail-shooting and riveting device allows the permanent magnet projectile to accelerate throughout the entire discharge cycle, whereas in traditional induction electromagnetic loading, the acceleration process of the disc-shaped secondary coil only occurs in the first half of the discharge cycle. This demonstrates the significant advantage of the reluctance electromagnetic loading principle in energy conversion efficiency. Specifically, the projectile in this invention is continuously accelerated by the attraction of the energized coil before reaching the geometric center of the coil, resulting in higher energy conversion efficiency. Therefore, compared to induction electromagnetic riveting devices, the reluctance electromagnetic loading principle effectively reduces the loading voltage, lowers the power supply capacity requirements of the control cabinet, and facilitates miniaturization and energy saving of the equipment.

[0017] 2. Secondly, this utility model features a smooth, integrated handle with a built-in buffer component, which improves the comfort of use. In addition, compared with traditional pneumatic riveting equipment, it does not require strict equipment sealing requirements or high-pressure air storage equipment, thus offering better safety. Furthermore, it has a faster response speed than pneumatic equipment, allowing for better control of impact force and loading energy. This enriches the application forms of magnetoresistive electromagnetic loading technology and broadens the application fields of electromagnetic loading equipment. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of a magnetic reluctance nail-shooting and riveting device according to the present invention; Figure 2 This is a schematic diagram of the outer shell of this utility model; Figure 3 This is a structural diagram of the coil assembly, mass block, and transmitting tube; Figure 4 This is a schematic diagram of the buffer component; Figure 5 This is a structural diagram of the guide component; Figure 6 This is a structural diagram of the impact assembly, projectile, and elastic washer; Figure 7 This is a schematic diagram of the driving circuit of this utility model.

[0020] In the diagram: 1. Handle; 2. Return spring; 3. Cylindrical body; 4. Mass block; 5. Guide rod; 6. Linear bearing; 7. Impact head; 8. Coil frame; 9. Launch tube; 10. Mounting head; 11. Nail; 12. First clamping plate; 13. Second clamping plate; 14. Coil; 15. Projectile; 16. Buffer; 17. Elastic washer; 18. Electromagnet; 19. First adjusting seat; 20. Second adjusting seat; 21. Transformer; 22. Rectifier silicon stack; 23. Capacitor bank; 24. Discharge thyristor; 25. Internal resistance of the circuit. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] An embodiment of the magnetic reluctance nail-shooting and riveting device of this utility model is as follows: Figure 1 As shown, it includes: a housing assembly and a buffer assembly, with a mass block 4 and an impact assembly sequentially arranged inside the housing assembly along its length; wherein, as... Figure 1 and Figure 3As shown, the impact assembly includes: a launching tube 9, which is coaxially disposed within the outer shell assembly. A projectile 15 is slidably disposed within the launching tube 9. An impact head assembly is slidably disposed within the cavity formed between the launching port of the launching tube 9 and the head of the outer shell assembly, and a nail 11 is connected to one end of the impact head assembly extending out of the outer shell assembly; an electromagnet 18 is disposed on the mass block 4, and the electromagnet 18 and the coil assembly are connected via a switch and a power supply. The electromagnet 18 is used to attract or detach from the projectile 15; the coil assembly is sleeved on the launching tube 9 and is used to generate a magnetic field when energized to drive the projectile 15 to move within the launching tube 9 to impact the impact head assembly, and under the reaction force of the impact, it drives the mass block 4 to recoil along the guide assembly; a buffer assembly is disposed between the coil assembly and the top inner wall of the outer shell assembly to absorb the recoil energy of the mass block 4.

[0023] It should be noted that in this embodiment, when the power supply and electromagnet 18 are connected by a switch, the electromagnet 18 is demagnetized. When the power supply and electromagnet 18 are disconnected by the switch, the electromagnet 18 becomes ferromagnetic. That is, when the power supply and electromagnet 18 are not connected, the electromagnet 18 attracts the projectile 15 to adhere to the electromagnet 18 at the initial loading position. When the electromagnet 18 is energized, the ferromagnetism of the electromagnet 18 disappears, the projectile 15 is released from the attraction of the electromagnet 18, and the projectile 15 can move inside the launching tube 9.

[0024] For example, such as Figure 2 As shown, in one specific embodiment, the outer shell assembly includes: a cylindrical body 3, both ends of which are sealed by end caps, the end caps being a head end cap and a tail end cap, wherein the tail end cap is provided with a handle 1, the head end cap has a protrusion, and a circular cavity is provided on the side of the protrusion facing the launching tube 9, and a mounting hole for the impact head assembly is opened on the end face of the protrusion, the edge of the mounting hole is rounded, and the launching end of the launching tube 9 is fixed on the inner side of the end cap with the mounting hole, wherein the launching port of the launching tube 9 and the circular cavity of the protrusion form the cavity of the impact head assembly.

[0025] For example, such as Figure 3As shown, in one specific embodiment, the coil assembly includes: a coil frame 8, which is sleeved on the transmitting tube 9, and a coil 14 is wound around the outer ring of the coil frame 8, wherein the coil 14 is connected to a power source; wherein the coil frame 8 includes: a cylindrical body, and a limiting flange is provided at the end of the cylindrical body, wherein the coil 14 is wound on the cylindrical body between the two limiting flanges. It should be noted that the coil frame 8 has a first coil lead hole at the point where the coil 14 is wound, and the mass block has a second lead hole at the corresponding position of the first coil lead hole of the coil frame 8. The lead wire holes of the first coil, the lead wire holes of the second coil, and the lead wire grooves provided on the mass block 4 allow the coil wires to pass through the coil frame 8 and the mass block 4 and connect to the power supply. When the coil 14 is energized, the electromagnet 18 loses its magnetism, and the coil 14 attracts the ferromagnetic projectile 15 from the tail of the launching tube 9 to the head, which hits the impact head assembly and generates an impact force, thereby nailing the nail 11 on the impact head assembly into the first sandwich plate 12 and the second sandwich plate 13 to achieve the riveting of the first sandwich plate 12 and the second sandwich plate 13.

[0026] For example, such as Figure 3 As shown, in one specific embodiment, the mass block 4 is a hollow shell structure. The mass block 4 is sleeved on the launching tube 9, and a connecting flange is provided on one end of the mass block 4 sleeved on the launching tube 9. The connecting flange is connected to the limiting flange of the coil frame 8. The side of the connecting flange away from the limiting flange is provided with a mounting sleeve for installing the buffer assembly. The electromagnet 18 is fixed inside the hollow shell. Specifically, the center of the mass block 4 is provided with a coaxial hole that fits with the launching tube 9. The end of the electromagnet 18 is provided with a threaded hole. The threaded hole is threadedly connected to the boss provided in the inner cavity of the mass block 4 to realize the connection between the mass block 4 and the electromagnet 18. Furthermore, a lead wire groove is provided at the installation position of the mass block and the electromagnet 18 for the lead wire of the electromagnet 18 to pass through the mass block 4. The tail end cap of the cylindrical body 3 of the outer shell assembly is covered with a lead wire tube, which allows the lead wire of the electromagnet 18 and the lead wire of the coil 14 to pass through the outer shell assembly.

[0027] For example, such as Figure 4 As shown, in one specific embodiment, the buffer assembly includes: a buffer 16, which is installed inside the mounting sleeve. The end of the buffer 16 facing away from the mounting sleeve is threadedly connected to a first adjusting seat 19 via a connecting rod. A first screw is provided on the first adjusting seat 19. After the first screw passes through the end face of the housing assembly, a first nut is connected to it. The buffer and the first adjusting seat 19 compensate for assembly errors by adjusting the distance of the engaged threads.

[0028] For example, such as Figure 1 As shown, in one specific embodiment, a return spring 2 is also provided between the end of the mass block 4 away from the launch tube 9 and the inner wall of the outer casing assembly.

[0029] For example, such as Figure 1 and Figure 6 As shown, in one specific embodiment, the impact head assembly includes: an impact head 7, on which a mounting head 10 for mounting a nail 11 is threadedly connected; a limiting boss is provided in the middle section of the impact head 7; the impact head 7 on one side of the limiting boss is slidably disposed in the firing tube 9; the impact head 7 on the other side of the limiting boss is slidably disposed in the cavity between the firing tube and the head cover plate of the cylindrical body 3; that is, the diameter of the limiting boss is larger than the inner diameter of the firing tube 9 and the diameter of the mounting hole on the head end cover of the cylindrical body 3; the center of the impact head 7 has an internal threaded hole and a set screw hole for connecting and fixing with the external thread at the tail of the mounting head 10; the impact head 7 can slide axially within the head of the cylindrical body 3; the mounting head 10 is made of permanent magnet material; the center of the mounting head 10 is provided with an auxiliary positioning groove adapted to different types of nails 11; before riveting, it can attract the ferromagnetic nails 11 into the positioning groove to prevent relative movement between the nails 11 and the mounting head 10 during the installation process; and it can be replaced according to the different nail head diameters of the nails 11.

[0030] For example, such as Figure 1 and 5 As shown, in one specific embodiment, the guiding assembly includes: a guide rod 5, one end of which is fixed to the bottom end face of the housing assembly, and the other end of which is threadedly connected to a second adjusting seat 20. A second screw is provided on the second adjusting seat 20, and a second nut is provided at the end of the second screw that protrudes from the top of the housing assembly. The middle part of the guide rod 5 is connected to a linear bearing 6, a limiting flange, and a connecting flange. That is, the guide rod 5 and the second adjusting seat 20 can compensate for assembly errors by adjusting the distance of the engaged threads. It should be noted that the linear bearing 6 is fixed to the corresponding mounting through holes on the limiting flange of the coil frame 8 and the connecting flange of the mass block 4. The guide rod 5 protrudes from the inside of the linear bearing. The head of the guide rod 5 is provided with a threaded hole and the tail is provided with an external thread. The head of the cylindrical body 3 is connected to the head of the guide rod 5 by screws. The tail end cap is provided with a through hole for the second adjusting seat 20 to pass through and a countersunk hole for the nut. The guide rod 5 passes through the movement hole of the linear bearing 6, and the guide rod 5 restricts the recoil direction of the mass block 4 and the coil assembly.

[0031] For example, in one specific embodiment, an elastic washer 17 is also provided between the end faces of the electromagnet 18 and the launching tube 9 to reduce the impact when the projectile 15 is attracted and reset by the electromagnet 18.

[0032] The following description, based on experimental data, illustrates this embodiment: The riveting test results of existing magnetic reluctance electromagnetic riveting guns, which operate on the same principle as the magnetic reluctance nail-shooting riveting equipment in this embodiment, are compared with those of existing induction electromagnetic riveting guns. The energy utilization efficiency of electromagnetic riveting is then considered. The calculation formula is as follows: ,in For plastic deformation energy, This represents the total capacitance of the capacitor bank. The values ​​represent the installation voltage. It should be noted that the purpose of this experimental data is to compare the inductive electromagnetic loading principle with the reluctance electromagnetic loading principle. Both the rivet gun and the nail-shooting device use the same reluctance electromagnetic loading principle. As shown in Table 1, when achieving the same riveting effect with 5mm diameter 2A12 aluminum alloy rivets, the inductive electromagnetic rivet gun reduces the riveting voltage by 145V and increases the energy conversion efficiency by 150%.

[0033] Table 1

[0034] Working principle like Figure 1 and Figure 7 As shown, the process of connecting the first sandwich plate 12 and the second sandwich plate 13 with magnetic reluctance nails is as follows: Step 1: Determine the mounting head 10 to be used based on the actual nail 11 used. Simultaneously, determine whether a material pretreatment process is needed based on the characteristics of the first and second sandwich panels 12 and 13 to be connected: If the first and second sandwich panels 12 and 13 to be connected are too thick or have high strength, they can be preheated before riveting. Preheating softens the material and prevents cracking during the riveting process. When riveting thick or high-strength materials, a top-holding fixture should be installed on the opposite side of the magnetic reluctance nail riveting equipment to prevent dents in the first and second sandwich panels 12 and 13 to be connected.

[0035] Step 2: Determine the installation voltage based on the first and second interlayer plates 12 and 13 to be connected and whether a pre-treatment process is required. Connect the magnetic reluctance nail-riveting equipment and the control power cabinet to form a drive circuit. Turn on the control power cabinet and input the installation voltage. After the nail 11 is attracted into the mounting positioning groove of the mounting head 10, press the magnetic reluctance nail-riveting equipment and the nail 11 against the first and second interlayer plates 12 and 13 to be connected.

[0036] Step 3: As Figure 7 As shown, when the charging button on the handle 1 of the magnetic reluctance nail shooting and riveting equipment is pressed, the 380 V AC power is stepped up by the transformer 21 and rectified by the rectifier silicon stack 22, and then charged to the capacitor bank 23 until the voltage reaches the value input to the control power cabinet in step two. At this time, the indicator light on the handle 1 lights up to indicate that the charging is complete. The internal resistance 25 in the circuit can limit the discharge current to prevent damage to the internal components of the circuit.

[0037] Step 4: Press the discharge button on the handle 1 of the reluctance nail gun riveting equipment. At this time, the control power cabinet controls the discharge thyristor 24 to discharge the coil 14 in the reluctance nail gun riveting equipment. At this time, the electromagnet 18 loses its magnetism due to the influence of the control circuit. The large current generated by the control power cabinet in a short time causes the coil 14 to generate strong magnetism, attracting the ferromagnetic projectile 15 to move towards the head of the equipment and hit the impact head 7 to generate impact force. At the same time, the coil frame 8 of the coil assembly drives the mass block 4 to recoil along the direction of the guide rod 5. The recoil force is reduced by the buffer assembly, and part of the recoil energy is absorbed by the reset spring 2.

[0038] Step 5: After the impact head 7 is subjected to the impact force, it drives the nail 11 to move at high speed to penetrate the first sandwich plate 12 and the second sandwich plate 13. The nail 11, the first sandwich plate 12 and the second sandwich plate 13 form an interlocking structure to complete the connection. At this time, the electromagnet 18 is disconnected by the control circuit and regains its magnetism.

[0039] Step Six: After the coil assembly and mass block 4 have sat back to their maximum displacement, the return spring 2 drives the mass block 4 and coil assembly to return to their initial position. By slightly tilting the magnetic reluctance nail-shooting and riveting device to the tail, the projectile 15 can be restored to its initial loading position and re-attracted to the electromagnet 18. At the same time, the impact head 7 returns to its initial position, thus completing the riveting cycle.

[0040] Step 7: Repeat steps 3 to 6 to complete the riveting work of nail 11.

[0041] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A reluctance pin shooting and riveting apparatus, characterized by, include: The outer casing assembly includes a mass block and an impact component arranged sequentially within the outer casing assembly along its length. The impact assembly includes: a launching tube, coaxially mounted within the outer casing assembly, with a projectile slidably mounted therein; an impact head assembly slidably mounted within a cavity formed between the launching port of the launching tube and the head of the outer casing assembly, with a nail connected to one end of the impact head assembly extending out of the outer casing assembly; an electromagnet mounted on a mass block, the electromagnet and a coil assembly connected via a switch and a power supply, the electromagnet being used to attract or detach from the projectile; and a coil assembly mounted on the launching tube, used to generate a magnetic field when energized to drive the projectile to move within the launching tube to impact the impact head assembly, and under the reaction force of the impact, to drive the mass block to recoil along the guide assembly. It also includes a buffer assembly, which is disposed between the inner rear wall of the coil assembly and the housing assembly, for absorbing the recoil energy of the mass block.

2. A magnetorheological shot peen riveting apparatus as defined in claim 1, wherein, The outer casing assembly includes a cylindrical body, both ends of which are sealed by end caps. One end cap is provided with a handle, and the other end cap is provided with a protrusion. The side of the protrusion facing the launching tube is a circular cavity. The end face of the protrusion is provided with a mounting hole for the impact head assembly to pass through. The launching end of the launching tube is fixed to the inner side of the end cap with the mounting hole. The launching port of the launching tube and the circular cavity of the protrusion form the cavity of the impact head assembly.

3. A magnetorheological shot peening and riveting apparatus as defined in claim 1, wherein, The coil assembly includes: a coil frame, which is fitted onto the transmitting tube, and a coil is wound around its outer ring, wherein the coil is connected to a power source.

4. A magnetorheological shot peening and riveting apparatus as defined in claim 3, wherein, The coil frame includes a cylindrical body with limiting flanges at its ends, wherein the coil is wound on the cylindrical body between two limiting flanges.

5. A magnetorquerteric pin shooting and riveting apparatus as defined in claim 4 wherein, The mass block is a hollow shell structure, which is sleeved on the launching tube, and a connecting flange is provided on one end of the sleeved on the launching tube. The connecting flange is connected to the limiting flange of the coil frame. A mounting sleeve for installing a buffer assembly is provided on the side of the connecting flange away from the limiting flange. The electromagnet is fixed inside the hollow shell.

6. A magnetorheological shot peen riveting apparatus as claimed in claim 5, wherein, The buffer assembly includes: a buffer installed inside the mounting sleeve, with one end of the buffer facing away from the mounting sleeve connected to a first adjusting seat via a connecting rod, a first screw provided on the first adjusting seat, and a first nut connected to the first screw after it passes through the end face of the housing assembly.

7. A magnetorheological shot peen riveting apparatus as defined in claim 1, wherein, A return spring is also provided between the end of the mass block away from the launch tube and the inner wall of the outer casing assembly.

8. A magnetorheological shot peen riveting apparatus as defined in claim 1, wherein, The impact head assembly includes an impact head with a threaded mounting head for mounting a nail.

9. A magnetorheological shot peen riveting apparatus as defined in claim 5, wherein, The guide assembly includes: a guide rod, one end of which is fixed to the bottom end face of the housing assembly, and the other end of which is provided with a second adjusting seat. A second screw is provided on the second adjusting seat, and a second nut is provided at the end of the second screw that protrudes from the top of the housing assembly. The middle part of the guide rod is connected to a linear bearing, a limiting flange, and a connecting flange.

10. A magnetorheological shot peen riveting apparatus as defined in claim 1, wherein, An elastic washer is also provided between the end face of the electromagnet and the transmitting tube.

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