A handheld servo riveting gun

Abstract

This application relates to the technical field of riveting devices, and discloses a handheld servo riveting gun, which includes a gun body. On one side of the gun body, a frameless motor is fixedly arranged. Inside the frameless motor, a connecting shaft is drivingly connected. One end of the connecting shaft is fixedly connected with an inner screw rod. A driving mechanism is arranged inside the gun body. On one side of the gun body, a fixed sleeve is fixedly arranged. On one side of the fixed sleeve, a plurality of pressure sensors are fixedly arranged. The frameless motor cooperates with the connecting shaft to drive the inner screw rod to be sleeved with a rivet nut. In the present invention, the perpendicularity of the rivet nut is detected by the servo feedback of the pressure sensor and the frameless motor before the riveting action, so as to ensure the quality of subsequent riveting. And by filling the gas in the first fixed cylinder into the space between the fixed sleeve, the rivet nut and the riveted part after the riveting action, the airtightness of the riveting is detected, reducing subsequent detection processes and facilitating the traceability of later products.

Description

Technical Field

[0001] The present application relates to the technical field of riveting devices, and particularly to a handheld servo riveting gun. Background Art

[0002] In the process of processing and fastening various industrial workpieces such as metal plates or pipes, a servo riveting gun is required to perform blind riveting and fastening on a rivet nut and a workpiece to be riveted without tapping an internal thread. The existing servo riveting gun includes a servo motor. The servo motor cooperates with a transmission mechanism to drive a riveting gun screw to rotate. First, the rivet nut is sleeved on the screw, and the rivet nut only moves axially relative to the screw until it contacts the gun head. Then, the screw moves axially relative to the gun body, and the part of the screw sleeved with the rivet nut moves towards the gun head. The gun head abuts against the end face of the rivet nut, causing the thin-walled area of the rivet nut to deform on the back of the workpiece to be riveted to form a circle to abut against the riveted part, completing the riveting of the rivet nut and the riveted part.

[0003] However, during the use of the traditional servo riveting gun, when manually holding the servo riveting gun to abut the rivet nut against the workpiece to be riveted, it is difficult to ensure that the riveting action is performed when the axis of the rivet nut is parallel to the axis of the riveting hole. As a result, the thin wall of the rivet nut after deformation cannot maintain contact with the riveting surface, affecting the quality of the riveting. This leads to a decrease in the yield rate of products when manually operating the servo riveting gun for workpiece fastening in cases where stable riveting quality and good airtightness of the contact surface between the rivet nut and the riveted part are required. Summary of the Invention

[0004] The present application provides a handheld servo riveting gun, which has the advantages of detecting the perpendicularity of the rivet nut before the riveting action and facilitating the detection of the airtightness of the contact surface between the rivet nut and the riveted part, so as to solve the problem that it is difficult for a manually held servo riveting gun to ensure that the axis of the rivet nut is perpendicular to the riveting surface before riveting.

[0005] To achieve the above object, the present application adopts the following technical solution: A handheld servo riveting gun includes a gun body. An edgeless motor is fixedly arranged on one side of the gun body. A connecting shaft is drivingly connected to the inside of the edgeless motor. One end of the connecting shaft is fixedly connected to an inner screw. A driving mechanism is arranged inside the gun body. A fixing sleeve is fixedly arranged on one side of the gun body. A plurality of pressure sensors are fixedly arranged on one side of the fixing sleeve.

[0006] The edgeless motor cooperates with the connecting shaft to drive the inner screw to be sleeved with the rivet nut. The pressure sensors are used to detect the pressure value between the fixing sleeve and the contact surface of the workpiece to be riveted. The driving mechanism starts the riveting action when the servo feedback value of the edgeless motor and the feedback value of the pressure sensors are within the rated range. The driving mechanism is used to drive the screw to move axially.

[0007] Further, the driving mechanism includes a moving cylinder which is rotationally clamped to the connecting shaft. One end of the moving cylinder is fixedly connected with a moving lead screw. One side of the inner wall of the gun body is fixedly connected with a third support plate which is slidably sleeved on the moving cylinder. One side of the inner wall of the gun body is fixedly connected with a first support plate. The bottom of the first support plate is rotationally sleeved with a rotating nut which is threadedly sleeved on the moving lead screw.

[0008] The rotating nut cooperates with the moving lead screw to drive the axial movement of the moving cylinder, and the third support plate restricts the relative rotation of the moving cylinder 7.

[0009] Further, one side of the inner wall of the gun body is fixedly provided with a second support plate. The top of the second support plate is fixedly connected with a first fixing cylinder. One side of the fixing sleeve is fixedly provided with a pressure sensor. The middle position near the top of the first fixing cylinder is fixedly connected with a connecting pipe. A gas supply mechanism is arranged in the first fixing cylinder. The gas supply mechanism can, after the riveting action is completed, fill the gas in the cavity of the first fixing cylinder into the inner side of the cavity formed by the riveting nut, the riveted part and the fixing sleeve through the connecting pipe.

[0010] By pressurizing the cavity between the riveting nut, the riveted part 12 and the fixing sleeve, it is judged whether the gas can pass through the gap between the riveting nut and the riveted part 12 to detect the sealing performance of the riveting.

[0011] Further, the gas supply mechanism includes a first sliding plug which is slidably sleeved inside the first fixing cylinder. One side of the first sliding plug is fixedly connected with a first connecting rod which is fixedly connected with the moving cylinder. A vent hole is opened on one side of the first fixing cylinder;

[0012] One side of the bottom of the first fixing cylinder is fixedly connected with a first air inlet pipe. A one-way valve is fixedly arranged on the pipe body of the first air inlet pipe. The first air inlet pipe cooperates with the one-way valve to enable air to pass through the first air inlet pipe unidirectionally into the cavity of the first fixing cylinder. One side of the first fixing cylinder is fixedly connected with an elastic air bag. One side of the first sliding plug is fixedly connected with a sealing plate for closing the opening of the connecting pipe. A through hole is opened on one side of the sealing plate.

[0013] The movement of the moving cylinder cooperates with the first connecting rod to drive the sliding plug to compress the gas during the riveting process, so that the elastic air bag stores energy. After the riveting action is completed, the elastic air bag releases energy to provide air pressure.

[0014] Further, an outer screw rod is rotationally clamped on one side of the gun body. A moving sleeve is threadedly sleeved on the outer side of the outer screw rod. The moving sleeve is slidably clamped between the moving sleeve and the fixing sleeve. The outer screw rod is slidably clamped with the inner screw rod. A cleaning mechanism is arranged on one side inside the gun body. The cleaning mechanism can provide gas to pass through the meshing gap between the inner screw rod and the riveting nut during the process of the inner screw rod pushing out the riveting nut.

[0015] Make the moving sleeve keep in contact with the end face of the rivet nut during the process of sleeving and disengaging with the rivet nut and the inner screw, so as to ensure the cleaning of the inner screw during the process of the inner screw disengaging.

[0016] Furthermore, the cleaning mechanism includes a second fixed cylinder, the second fixed cylinder is fixedly connected with the first fixed cylinder, a through hole is opened on one side of the second fixed cylinder, a second sliding plug is slidably sleeved inside the second fixed cylinder, and a second connecting rod is fixedly connected to one side of the second sliding plug;

[0017] A fixed pipe is fixedly connected to one side of the second fixed cylinder, a second air inlet pipe is fixedly connected to one side of the top of the second fixed cylinder, a one-way valve is fixedly arranged on the pipe body of the second air inlet pipe, and the second air inlet pipe cooperates with the one-way valve to enable air to pass through the second air inlet pipe unidirectionally into the cavity of the second fixed cylinder. A moving pipe is fixedly sleeved at the bottom of the moving sleeve, the moving pipe is slidably sleeved with the fixed pipe, and a fixed block is fixedly arranged on one side inside the gun body, and the fixed block is slidably sleeved with the moving cylinder.

[0018] Drive the second connecting rod to act through the connecting shaft, so that the process of the second sliding plug compressing the second fixed cylinder matches the action of the inner screw disengaging from the rivet nut, and the moving pipe moves axially relative to the fixed pipe following the movement of the moving sleeve to keep communicating.

[0019] Furthermore, the number of the third support plates is set to two, a rotating sleeve is rotatably arranged on the top of the third support plates, the rotating sleeve and the connecting shaft are slidably clamped, a moving block is movably arranged on the outer side of the rotating sleeve, a moving rod is fixedly connected to one side of the moving block, the moving rod is fixedly connected with the second connecting rod, the moving rod is slidably connected with the third support plate, a guiding block is fixedly arranged inside the moving block, and a guiding groove is opened on the outer side of the rotating sleeve, and the guiding groove is spiral and the pitch of the spiral increases axially.

[0020] Make the rotating sleeve rotate at a rated speed to drive the moving block to move axially at different speeds, so that the rate of the second sliding plug compressing the second fixed cylinder is adapted to the length of the engagement area between the inner screw and the rivet nut.

[0021] Furthermore, a sliding cavity is opened on one side of the moving sleeve, a sealing block is slidably arranged inside the sliding cavity, the sealing block is used for sealing the gap between the rivet nut and the moving sleeve, and a connecting hole is opened at the top of the inner wall of the sliding cavity.

[0022] The sealing block is pushed up by air pressure to open the connecting hole, ensuring that the sealing block seals the gap between the moving sleeve and the rivet nut during the process of the inner screw disengaging from the rivet nut.

[0023] Further, the outer diameter of one side of the movable sleeve is adapted to the inner diameter of the rivet nut, and an elastic diaphragm is fixedly arranged on one side of the movable sleeve.

[0024] The elastic diaphragm increases the additional friction and reduces the possibility of synchronous rotation during the process of the rivet nut sleeving on the inner screw.

[0025] Further, a servo motor is fixedly arranged on one side inside the gun body, a speed reducer is fixedly arranged on one side inside the gun body, and a switch is arranged at the bottom of the gun body.

[0026] The process of sleeving the inner screw with the rivet nut, riveting, and separating the inner screw from the rivet nut is started through the switch.

[0027] The beneficial effects of the present invention are as follows:

[0028] A handheld servo riveting gun provided by the present application, through the cooperation of the servo feedback of the frameless motor and the pressure sensor, detects the perpendicularity between the rivet nut and the riveting part and the sleeving position of the rivet nut before the riveting action, so as to perform the riveting action when the gun body is perpendicular to the riveting part, achieving the effect of ensuring the riveting quality of the servo riveting gun. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only the embodiments of the present invention, and for those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts:

[0030] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0031] Figure 2 It is a schematic cross-sectional view of the overall structure of the present application;

[0032] Figure 3 It is a schematic cross-sectional view of the structure of the inner screw cooperating with the rivet nut of the present application;

[0033] Figure 4 For the present application Figure 3 The enlarged view of the structure at A in;

[0034] Figure 5 It is a schematic cross-sectional view of the structure at the movable cylinder of the present application;

[0035] Figure 6 For the present application Figure 5 The enlarged view of the structure at B in;

[0036] Figure 7 It is a schematic diagram of the connection relationship between the movable sleeve and the fixed sleeve of the present application.

[0037] In the figure: 1 - gun body, 2 - frameless motor, 3 - connecting shaft, 4 - inner screw rod, 5 - servo motor, 6 - reducer, 7 - moving cylinder, 8 - rotating nut, 9 - moving screw rod, 10 - first support plate, 11 - rivet nut, 12 - riveting part, 13 - switch, 14 - pressure sensor, 15 - connecting pipe, 16 - first fixing cylinder, 17 - first connecting rod, 18 - first sliding plug, 19 - first air inlet pipe, 20 - second support plate, 21 - fixing sleeve, 22 - moving sleeve, 23 - outer screw rod, 24 - air pressure sensor, 25 - moving pipe, 26 - fixing pipe, 27 - second fixing cylinder, 28 - second sliding plug, 29 - second connecting rod, 30 - second air inlet pipe, 31 - fixing block, 32 - sliding cavity, 33 - sealing block, 34 - connecting hole, 35 - elastic diaphragm, 36 - third support plate, 37 - rotating sleeve, 38 - moving block, 39 - guiding groove, 40 - guiding block, 41 - moving rod, 42 - elastic airbag, 43 - sealing plate, 44 - ventilation hole. Specific implementation mode

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] Embodiment 1, as Figures 1-5 and Figure 7 , a handheld servo riveting gun, including a gun body 1, a frameless motor 2 is fixedly arranged on one side of the gun body 1, and a connecting shaft 3 is drivingly connected inside the frameless motor 2. Specifically, the stator of the frameless motor 2 is fixedly connected to the inner wall of the gun body 1, a shaft sleeve is fixedly sleeved on the rotor of the frameless motor 2, the inner side of the shaft sleeve is fixedly sleeved with the connecting shaft 3, one end of the connecting shaft 3 is fixedly connected with an inner screw rod 4, and the other end of the connecting shaft 3 is rotationally clamped with a moving cylinder 7 for driving the inner screw rod 4 to axially move. One end of the moving cylinder 7 is fixedly connected with a moving screw rod 9. Refer to Figure 5 , one side of the inner wall of the gun body 1 is fixedly connected with a third support plate 36, the third support plate 36 is slidably sleeved with the moving cylinder 7, and the third support plate 36 restricts the rotation of the moving cylinder 7 relative to the gun body 1.

[0040] Refer to Figure 2, on one side of the inner wall of the gun body 1, a first support plate 10 is fixedly connected. A rotating nut 8 is rotatably sleeved at the bottom of the first support plate 10. The rotating nut 8 is threadedly sleeved with a moving screw rod 9. The rotating nut 8 can be set as a ball screw nut. A servo motor 5 is fixedly arranged on one side inside the gun body 1, and a speed reducer 6 is fixedly arranged on one side inside the gun body 1. The output end of the servo motor 5 is drivingly connected to the input end of the speed reducer 6. The output end of the speed reducer 6 is drivingly connected to the rotating nut 8 through a rotating shaft. A switch 13 is arranged at the bottom of the gun body 1. A fixing sleeve 21 is fixedly arranged on one side of the gun body 1. A pressure sensor 14 is fixedly arranged on one side of the fixing sleeve 21. The number of the pressure sensors 14 is set to be several, and several pressure sensors 14 are arranged at equal intervals on the fixing sleeve 21.

[0041] Refer to Figure 3 , during use, place the rivet nut 11 into the through hole of the workpiece to be riveted 12. Hold the gun body 1 by hand and insert the inner screw rod 4 into the threaded hole of the rivet nut 11. Start the switch 13. The frameless motor 2 rotates. The frameless motor 2 drives the inner screw rod 4 to rotate, so that the threaded parts of the inner screw rod 4 and the rivet nut 11 are engaged in a threaded sleeve manner. The inner screw rod 4 extends into the rivet nut 11 until the rivet nut 11 axially moves relative to the inner screw rod 4 and contacts the fixing sleeve 21. According to the servo feedback of the frameless motor 2, judge whether the end face of the rivet nut 11 fits against the side wall of the fixing sleeve 21. The pressure sensor 14 contacts the workpiece to be riveted 12, and judge whether the difference between the feedback values of different pressure sensors 14 exceeds the threshold value, so as to ensure that before the riveting action, it is judged whether the axis of the inner screw rod 4 of the hand-held servo riveting gun is perpendicular to the workpiece to be riveted 12, and it is convenient to adjust the angle of holding the gun body 1 according to the feedback value to ensure the quality of riveting.

[0042] When the difference is less than the threshold value and the end face of the rivet nut 11 fits against the side wall of the fixing sleeve 21, at this time, the axis of the inner screw rod 4 drives the rivet nut 11 to be perpendicular to the end face of the workpiece to be riveted 12. The frameless motor 2 stops output, and the servo motor 5 starts. The servo motor 5 cooperates with the speed reducer 6 to drive the rotating nut 8 to rotate. The rotation of the rotating nut 8 drives the moving screw rod 9 to axially move. The movement of the moving screw rod 9 drives the moving cylinder 7 to move. The moving cylinder 7 drives the connecting shaft 3 to move. The connecting shaft 3 drives the inner screw rod 4 to move and contract into the gun body 1. The movement of the inner screw rod 4 drives the threaded part of the rivet nut 11 to move towards one side of the riveting part 12. One end face of the rivet nut 11 abuts against the side wall of the fixing sleeve 21. Thus, the thin wall of the rivet nut 11 deforms under the action of riveting, and the riveting of the rivet nut 11 and the riveting part 12 is completed.

[0043] Refer to Figure 5, on one side of the inner wall of the gun body 1, a second support plate 20 is fixedly arranged. On the top of the second support plate 20, a first fixing cylinder 16 is fixedly connected. Inside the first fixing cylinder 16, a first sliding plug 18 is slidably sleeved. At a position near the midpoint on one side of the first sliding plug 18, a first connecting rod 17 is fixedly connected. The first connecting rod 17 is fixedly connected to the moving cylinder 7. Refer to Figure 5 , on one side of the first fixing cylinder 16, a ventilation hole 44 is opened. On one side of the bottom of the first fixing cylinder 16, a first intake pipe 19 is fixedly connected. A one-way valve is fixedly arranged on the pipe body of the first intake pipe 19. The first intake pipe 19 and the one-way valve cooperate to enable air to pass through the first intake pipe 19 unidirectionally and enter the cavity of the first fixing cylinder 16. At a position near the middle on the top of the first fixing cylinder 16, a connecting pipe 15 is fixedly connected. On one side of the first fixing cylinder 16, an elastic airbag 42 is fixedly connected. On one side of the first sliding plug 18, a sealing plate 43 for closing the opening of the connecting pipe 15 is fixedly connected. A through hole is opened on one side of the sealing plate 43. The ventilation hole 44 and the elastic airbag 42 are respectively arranged on both sides of the first fixing cylinder 16. The first sliding plug 18 separates the cavity of the first fixing cylinder 16 where the ventilation hole 44 and the elastic airbag 42 are respectively arranged.

[0044] Refer to Figure 5 , Figure 7 , on one side of the fixing sleeve 21, two sealing members are arranged. The sealing members can be set as O-rings. When the riveting nut 11 contacts the fixing sleeve 21, a seal is formed between the fixing sleeve 21 and the riveting nut 11, and between the fixing sleeve 21 and the workpiece to be riveted 12. One end of the pipe body of the connecting pipe 15 is fixedly sleeved with the fixing sleeve 21. When performing the riveting action, the moving cylinder 7 moves to drive the first connecting rod 17 to move. The first connecting rod 17 drives the first sliding plug 18 to move. The first sliding plug 18 moves to press the gas in the cavity of the first fixing cylinder 16 into the elastic airbag 42 until the position of the through hole of the sealing plate 43 corresponds to the opening position of the connecting pipe 15, and the elastic airbag 42 contracts. Thus, after the riveting action is completed, the gas is pressed into the inner side of the cavity surrounded by the workpiece to be riveted 12, the riveting nut 11 and the fixing sleeve 21. On one side of the fixing sleeve 21, a pressure sensor 24 is fixedly arranged. According to the gas pressure value fed back by the pressure sensor 24, it is judged whether the gas passes through the contact surface between the riveting nut 11 and the workpiece to be riveted 12, and then the airtight performance between the riveting nut 11 and the riveted part 12 after riveting is judged, which is convenient for detecting the airtight performance of each riveting position and convenient for subsequent product traceability.

[0045] The internal screw 4 and the rivet nut 11 are riveted while being threadedly sleeved. Fine debris that is likely to adhere to the internal screw 4 accumulates after long-term use. The accumulated debris can easily cause blockage during the threaded sleeving process between the internal screw 4 and the rivet nut 11, resulting in errors in the feedback value of the frameless motor 2. This may cause the riveting action to occur when the end face of the rivet nut 11 does not contact the fixed sleeve 21, affecting the quality of riveting, causing the feedback of the pressure sensor 14 to fail, and easily affecting the sealing performance between the subsequent fixed sleeve 21, the rivet nut 11, and the riveted part 12.

[0046] Embodiment 2, as Figures 1-7 , on the basis of Embodiment 1, an external screw 23 is rotatably clamped on one side of the gun body 1. The external screw 23 can only rotate relative to the gun body 1. A moving sleeve 22 is threadedly sleeved on the outer side of the external screw 23. Refer to Figure 7 , the moving sleeve 22 and the fixed sleeve 21 are slidably clamped. The moving sleeve 22 can only slide axially relative to the fixed sleeve 21. The external screw 23 and the internal screw 4 are slidably clamped by a flat key. The internal screw 4 can axially move relative to the external screw 23 and can drive the external screw 23 to rotate. Refer to Figure 5 , one side of the first fixed cylinder 16 is fixedly connected to a second fixed cylinder 27. A through hole is opened on one side of the second fixed cylinder 27.

[0047] A second sliding plug 28 is slidably sleeved inside the second fixed cylinder 27. One side of the second sliding plug 28 is fixedly connected to a second connecting rod 29. One side of the second fixed cylinder 27 is fixedly connected to a fixed pipe 26. One side of the top of the second fixed cylinder 27 is fixedly connected to a second air inlet pipe 30. A one-way valve is fixedly arranged on the pipe body of the second air inlet pipe 30. The second air inlet pipe 30 and the one-way valve cooperate to enable air to pass through the second air inlet pipe 30 unidirectionally into the cavity of the second fixed cylinder 27. Refer to Figure 3 , the bottom of the moving sleeve 22 is fixedly sleeved with a moving pipe 25. The moving pipe 25 is slidably sleeved with the fixed pipe 26. A fixed block 31 is fixedly arranged on one side inside the gun body 1. The fixed block 31 and the moving cylinder 7 are slidably sleeved. A sliding sealing mechanism is arranged between the fixed block 31 and the moving cylinder 7. The sliding sealing mechanism can be set as an O-ring.

[0048] When the internal screw 4 abuts against the threaded part of the rivet nut 11, the moving sleeve 22 fits against the end face of the rivet nut 11. The internal screw 4 rotates to complete the sleeving with the rivet nut 11. At this time, the internal screw 4 rotates to drive the external screw 23 to rotate. The external screw 23 rotates to drive the moving sleeve 22 to axially move relative to the fixed sleeve 21. The rivet nut 11 approaches the gun body 1, and the fixed sleeve 21 synchronously moves towards one side of the gun body 1. The fixed sleeve 21 always remains in contact with the rivet nut 11 until the internal screw 4 completes the sleeving with the rivet nut 11. At this time, the side wall of the gun body 1 abuts against the moving sleeve 22. The gun body 1 and the moving sleeve 22 cooperate to provide support for the rivet nut 11 during the riveting action.

[0049] After the riveting is completed, the inner screw rod 4 rotates away from the rivet nut 11. At this time, the second connecting rod 29 moves to drive the second sliding plug 28 to move. The second sliding plug 28 allows the air in the cavity to enter the cavity between the moving sleeve 22 and the rivet nut 11 through the fixed pipe 26 and the moving pipe 25, enabling the gas to pass through the thread gap between the inner screw rod 4 and the rivet nut 11, thereby cleaning the surface of the inner screw rod 4 with the air flow, ensuring smooth transmission between the inner screw rod 4 and the rivet nut 11, ensuring the accuracy of the servo feedback value of the frameless motor 2, avoiding deviation of the feedback value of the pressure sensor 14, ensuring the quality of subsequent riveting and the stability of airtightness detection, reducing the additional wear of the inner screw rod 4, improving the reliability of the use of this servo riveting gun, and using the thread locking force between the inner screw rod 4 and the rivet nut 11 to ensure the fit between the fixed sleeve 22 and the rivet nut 11 during the cleaning process, facilitating hand-held operation.

[0050] Specifically, the number of the third support plates 36 is set to two. A rotating sleeve 37 is rotatably arranged on the top of the third support plate 36. Refer to Figure 6 , the rotating sleeve 37 and the connecting shaft 3 are slidably clamped in a keyway manner. The connecting shaft 3 can axially slide relative to the rotating sleeve 37 and can drive the rotating sleeve 37 to rotate. A moving block 38 is movably arranged on the outer side of the rotating sleeve 37. One side of the moving block 38 is fixedly connected with a moving rod 41. The moving rod 41 is L-shaped and fixedly connected with the second connecting rod 29. The moving rod 41 is slidably connected with the third support plate 36. The third support plate 36 restricts the rotation of the moving rod 41. A guiding block 40 is fixedly arranged inside the moving block 38. A guiding groove 39 is formed on the outer side of the rotating sleeve 37. The guiding groove 39 is spiral and the pitch of the spiral increases axially, that is, when the connecting shaft 3 rotates a rated angle, the guiding block 40 drives the rotating sleeve 37 to rotate by an increasing angle.

[0051] The rotation of the rotating sleeve 37 drives the guiding block 40 to slide along the guiding groove 39, thereby driving the moving block 38 to move. The moving block 38 drives the moving rod 41 to move. The moving rod 41 drives the second connecting rod 29 to move, and then the gas in the cavity of the second fixed cylinder 27 is pressed into the moving sleeve 22 to clean the inner screw rod 4. During the process of the inner screw rod 4 being pushed out of the rivet nut 11, the gun body 1 moves away from the rivet nut 11. At this time, the inner screw rod 4 cooperates with the outer screw rod 23 to drive the moving sleeve 22 to move, so that the moving sleeve 22 remains in contact with the rivet nut 11. Under the guiding action of the guiding groove 39, the axial movement amount of the guiding block 40 gradually increases, increasing the air supply amount when the length of the threaded socket part between the inner screw rod 4 and the rivet nut 11 decreases, ensuring that the air supply amount increases when the thread gap between the inner screw rod 4 and the rivet nut 11 decreases, and increasing the air flow rate to ensure the cleaning efficiency when the gas more easily passes through the thread gap.

[0052] Refer to Figure 4, a sliding cavity 32 is formed on one side of the moving sleeve 22. A sealing block 33 is slidably arranged inside the sliding cavity 32. The sealing block 33 is used to seal the gap between the rivet nut 11 and the moving sleeve 22. A connecting hole 34 is formed at the top of the inner wall of the sliding cavity 32. The connecting hole 34 is used to lead out the gas in the sliding cavity 32 to clean the debris on the inner screw rod 4. When the gas in the second fixed cylinder 27 passes through the fixed pipe 26 and the moving pipe 25, it enters the sliding cavity 32, pushing the sealing block 33 out of the moving sleeve 22. At the same time, the sealing block 33 moves away from the shielding of the connecting hole 34. During the process of the inner screw rod 4 withdrawing from the rivet nut 11, the air pressure is used to increase the sealing pressure on the sealing block 33, ensuring the sealing reliability between the rivet nut 11 and the moving sleeve 22 and the cleaning effect on the inner screw rod 4.

[0053] The outer diameter of one side of the moving sleeve 22 is adapted to the inner diameter of the rivet nut 11, which is convenient for positioning the moving sleeve 22 and the rivet nut 11. An elastic diaphragm 35 is fixedly arranged on one side of the moving sleeve 22. When the moving sleeve 22 extends into the inner side of the rivet nut 11, the elastic diaphragm 35 abuts against the inner wall of the rivet nut 11, providing additional friction force to prevent the rivet nut 11 from rotating with the inner screw rod 4 during the process of the rivet nut 11 being sleeved on the inner screw rod 4, ensuring the fitting between the rivet nut 11 and the moving sleeve 22, and further improving the reliability of the servo riveting gun.

[0054] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A handheld servo riveting gun, comprising a gun body (1), characterized in that, On one side of the gun body (1), a frameless motor (2) is fixedly arranged. Inside the frameless motor (2), a connecting shaft (3) is drivingly connected. One end of the connecting shaft (3) is fixedly connected to an inner screw rod (4). Inside the gun body (1), a driving mechanism is arranged. On one side of the gun body (1), a fixed sleeve (21) is fixedly arranged. On one side of the fixed sleeve (21), a plurality of pressure sensors (14) are fixedly arranged; The frameless motor (2) cooperates with the connecting shaft (3) to drive the inner screw rod (4) to be sleeved with a riveting nut (11). The pressure sensor (14) is used to detect the pressure value between the joint surface of the fixed sleeve (21) and the workpiece to be riveted (12). The driving mechanism starts the riveting action when the servo feedback value of the frameless motor (2) and the feedback value of the pressure sensor (14) are within the rated range. The driving mechanism is used to drive the screw rod (4) to axially move; The driving mechanism includes a moving cylinder (7). The moving cylinder (7) is rotationally clamped with the connecting shaft (3). One end of the moving cylinder (7) is fixedly connected to a moving lead screw (9). On one side of the inner wall of the gun body (1), a third support plate (36) is fixedly connected. The third support plate (36) is slidably sleeved with the moving cylinder (7). On one side of the inner wall of the gun body (1), a first support plate (10) is fixedly connected. At the bottom of the first support plate (10), a rotating nut (8) is rotationally sleeved. The rotating nut (8) is threadedly sleeved with the moving lead screw (9); On one side of the inner wall of the gun body (1), a second support plate (20) is fixedly arranged. On the top of the second support plate (20), a first fixing cylinder (16) is fixedly connected. On one side of the fixed sleeve (21), a pneumatic sensor (24) is fixedly arranged. At the middle position near the top of the first fixing cylinder (16), a connecting pipe (15) is fixedly connected. Inside the first fixing cylinder (16), a gas supply mechanism is arranged. The gas supply mechanism can, after the riveting action is completed, fill the gas in the cavity of the first fixing cylinder (16) into the inner side of the cavity surrounded by the riveting nut (11), the riveted part (12) and the fixed sleeve (21) through the connecting pipe (15); The gas supply mechanism includes a first sliding plug (18). The first sliding plug (18) is slidably sleeved inside the first fixing cylinder (16). On one side of the first sliding plug (18), a first connecting rod (17) is fixedly connected. The first connecting rod (17) is fixedly connected to the moving cylinder (7). On one side of the first fixing cylinder (16), a ventilation hole (44) is opened; One side of the bottom of the first fixed cylinder (16) is fixedly connected with a first air inlet pipe (19). A one-way valve is fixedly arranged on the pipe body of the first air inlet pipe (19). The first air inlet pipe (19) and the one-way valve cooperate to enable air to pass through the first air inlet pipe (19) unidirectionally and enter the cavity of the first fixed cylinder (16). One side of the first fixed cylinder (16) is fixedly connected with an elastic air bag (42). One side of the first sliding plug (18) is fixedly connected with a sealing plate (43) for closing the opening of the connecting pipe (15). A through hole is arranged on one side of the sealing plate (43).

2. The hand-held servo riveting gun according to claim 1, characterized in that, One side of the gun body (1) is rotatably clamped with an external screw rod (23). A moving sleeve (22) is threadedly sleeved on the outside of the external screw rod (23). The moving sleeve (22) is slidably clamped with the fixed sleeve (21). The external screw rod (23) is slidably clamped with the internal screw rod (4). A cleaning mechanism is arranged on one side in the gun body (1). The cleaning mechanism can provide gas to pass through the engagement gap between the internal screw rod (4) and the riveting nut (11) during the process of the internal screw rod (4) pushing out the riveting nut (11).

3. The hand-held servo riveting gun according to claim 2, characterized in that, The cleaning mechanism includes a second fixed cylinder (27). The second fixed cylinder (27) is fixedly connected with the first fixed cylinder (16). A through hole is arranged on one side of the second fixed cylinder (27). A second sliding plug (28) is slidably sleeved inside the second fixed cylinder (27). One side of the second sliding plug (28) is fixedly connected with a second connecting rod (29). One side of the second fixed cylinder (27) is fixedly connected with a fixed pipe (26). One side of the top of the second fixed cylinder (27) is fixedly connected with a second air inlet pipe (30). A one-way valve is fixedly arranged on the pipe body of the second air inlet pipe (30). The second air inlet pipe (30) and the one-way valve cooperate to enable air to pass through the second air inlet pipe (30) unidirectionally and enter the cavity of the second fixed cylinder (27). The bottom of the moving sleeve (22) is fixedly sleeved with a moving pipe (25). The moving pipe (25) is slidably sleeved with the fixed pipe (26). A fixed block (31) is fixedly arranged on one side in the gun body (1). The fixed block (31) is slidably sleeved with the moving cylinder (7).

4. The hand-held servo riveting gun according to claim 3, wherein The number of the third support plates (36) is set to two. A rotating sleeve (37) is rotatably arranged on the top of the third support plates (36). The rotating sleeve (37) is slidably clamped with the connecting shaft (3). A moving block (38) is movably arranged on the outside of the rotating sleeve (37). One side of the moving block (38) is fixedly connected with a moving rod (41). The moving rod (41) is fixedly connected with the second connecting rod (29). The moving rod (41) is slidably connected with the third support plates (36). A guiding block (40) is fixedly arranged inside the moving block (38). A guiding groove (39) is arranged on the outside of the rotating sleeve (37). The guiding groove (39) is spiral and the pitch of the spiral increases axially.

5. The hand-held servo riveting gun according to claim 3, wherein A sliding cavity (32) is formed on one side of the movable sleeve (22). A sealing block (33) is slidably arranged inside the sliding cavity (32). The sealing block (33) is used to seal the gap between the rivet nut (11) and the movable sleeve (22). A connecting hole (34) is formed at the top of the inner wall of the sliding cavity (32).

6. The hand-held servo riveting gun according to claim 3, characterized in that, The outer diameter of one side of the movable sleeve (22) is adapted to the inner diameter of the rivet nut (11). An elastic diaphragm (35) is fixedly arranged on one side of the movable sleeve (22).

7. A hand-held servo riveting gun according to claim 1, characterized in that, A servo motor (5) is fixedly arranged on one side inside the gun body (1). A speed reducer (6) is fixedly arranged on one side inside the gun body (1). A switch (13) is arranged at the bottom of the gun body (1).

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