Electrically powered rivet gun

Abstract

The application discloses an electric pull-riveting gun, which comprises a shell assembly, an electric cylinder, a bearing seat, an upper transmission shaft, a motor, a transmission sleeve, a middle transmission shaft, a lower transmission shaft, a pull-riveting rod, a second reset spring and a stop pin.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of non-cutting processing or handling of metal plates or tubes, rods or profiles, and in particular to an electric rivet gun. BACKGROUND

[0002] A rivet gun is a tool for fastening riveting processing, which deforms the rivet by tension to firmly process metal plates, tubular profiles and other components together. The rivet gun uses a hydraulic cylinder to move the rivet rod axially, and uses a pneumatic motor to rotate the rivet rod, thereby realizing the action of tension and rotation of the rivet. However, the hydraulic cylinder needs to be matched with a hydraulic pipe, which is prone to oil leakage. Therefore, the market has appeared a rivet gun using an electric cylinder and a motor as a driving source, such as the servo rivet gun disclosed in CN119016609A on November 26, 2024. However, only the electric cylinder and the motor are used to drive, and real-time feedback of the rivet cannot be implemented, and the quality cannot be guaranteed. SUMMARY

[0003] To overcome the above-mentioned shortcomings, the purpose of the present application is to provide an electric rivet gun which is small in size, simple in structure, stable in transmission, free of oil leakage and capable of detecting the riveting condition.

[0004] To achieve the above purpose, the technical scheme adopted by the present application is as follows: an electric rivet gun, comprising:

[0005] a shell assembly;

[0006] an electric cylinder, which is installed at the upper end of the shell assembly, and an annular pressure sensor is arranged on the telescopic shaft of the electric cylinder;

[0007] a bearing seat, which is located in the shell assembly and has its upper end connected and fixed with the end of the telescopic shaft of the electric cylinder, and the bearing seat can move up and down;

[0008] an upper transmission shaft, the upper end of which is rotatably arranged in the lower half of the bearing seat, the lower end of which extends out of the bearing seat, and a driven gear is fixed on the upper transmission shaft extending out of the bearing seat, and a proximity switch is arranged on the top of the upper transmission shaft;

[0009] a motor, which is fixedly installed on the shell assembly, and a driving gear is arranged on the output shaft of the motor, and the driving gear is engaged with the driven gear;

[0010] a transmission sleeve, the upper end of which is threadedly connected with the lower end of the upper transmission shaft;

[0011] The middle transmission shaft is hung on the lower end of the inner wall of the transmission sleeve with an active gap, the top of the middle transmission shaft is inserted into the bottom of the upper transmission shaft, the middle transmission shaft can move in the active gap, the top of the middle transmission shaft is provided with a trigger body which penetrates the upper transmission shaft and can move towards the proximity switch;

[0012] The lower transmission shaft is threadedly connected with the lower end of the middle transmission shaft;

[0013] The top of the rotation-stopping pin is elastically connected with the lower transmission shaft;

[0014] The rotation-stopping pin is inserted into the top of the pull-riveting rod, the rotation-stopping pin and the pull-riveting rod can move up and down relative to each other in the axial direction, the rotation-stopping pin and the pull-riveting rod can rotate synchronously, the outer wall of the upper end of the pull-riveting rod is threadedly connected with the inner wall of the lower end of the lower transmission shaft, and the lower end of the pull-riveting rod extends out of the bottom of the shell assembly;

[0015] The second reset spring is sleeved on the pull-riveting rod, the upper end of the second reset spring abuts against the bottom of the lower transmission shaft, and the lower end of the second reset spring is limited on the inner wall of the shell assembly.

[0016] Preferably, the shell assembly comprises:

[0017] The tubular shell is located in the bearing seat sleeve;

[0018] The gear box shell is detachably installed at the lower end of the tubular shell, the lower end of the upper transmission shaft penetrates the gear box shell, the driven gear is located in the gear box shell, and the motor is installed on one side of the gear box shell;

[0019] The conical sleeve shell is installed at the bottom of the gear box shell, the lower end of the upper transmission shaft extends into the conical sleeve shell, and the transmission sleeve is located in the conical sleeve shell;

[0020] The pull-riveting shell is detachably installed at the bottom of the conical sleeve shell, the lower end of the transmission sleeve extends into the pull-riveting shell, the middle transmission shaft and the lower transmission shaft are located in the pull-riveting shell, and the lower end of the second reset spring is limited on the bottom wall of the shell assembly;

[0021] The pull-riveting nozzle shell is detachably installed at the bottom of the pull-riveting shell, the pull-riveting rod is located in the pull-riveting nozzle shell, and the lower end of the pull-riveting rod extends out of the pull-riveting nozzle shell.

[0022] Preferably, the upper end of the upper transmission shaft is rotatably arranged in the bearing seat sleeve through an upper bearing set, and the upper bearing set comprises:

[0023] A first upper bearing is arranged in a bearing groove of the top of the upper transmission shaft;

[0024] A second upper bearing is arranged above a limiting flange of the upper end of the upper transmission shaft;

[0025] A third upper bearing is arranged below the limiting flange.

[0026] Preferably, the outer wall of the upper transmission shaft is integrally formed with a first engaging gear ring extending longitudinally along the tooth groove, the outer part of the first engaging gear ring is sleeved with a gear sleeve, the inner wall of the gear sleeve is provided with a second engaging gear ring engaged with the first engaging gear ring, the outer part of the gear sleeve is provided with a flange ring, and the flange ring is fixed with the driven gear through bolted fastening.

[0027] Preferably, the upper end and the lower end of the outer wall of the gear sleeve are provided with bearing mounting grooves, and each bearing mounting groove is provided with a gear bearing.

[0028] Preferably, the upper end of the outer wall of the middle transmission shaft is provided with a flange, the inner wall of the lower end of the transmission sleeve is provided with a hanging platform, the flange is hung on the hanging platform, and the movable gap is formed between the flange and the hanging platform.

[0029] Preferably, the top of the middle transmission shaft is provided with an insertion block, the bottom of the upper transmission shaft is provided with an insertion slot, the insertion block extends into the insertion slot, and the insertion block can move in the insertion slot with a movable distance of the movable gap.

[0030] Preferably, the bottom of the lower transmission shaft is provided with a spring mounting groove, and a first return spring is arranged between the spring mounting groove and the top of the rotation-stopping pin.

[0031] Preferably, the opposite sides of the spring mounting groove are provided with longitudinal waist holes, the rotation-stopping pin is provided with a transverse limiting rod penetrating therethrough, and the two ends of the limiting rod are respectively inserted into the two longitudinal waist holes.

[0032] Preferably, the bottom of the rotation-stopping pin is provided with a polygonal transmission column, the top of the pull-riveting rod is provided with a polygonal connecting slot, the polygonal connecting slot can be inserted into the polygonal transmission column, and the polygonal transmission column can move up and down in the polygonal connecting slot.

[0033] Preferably, the upper half of the pull-riveting rod has a larger diameter than the lower half, the upper half and the lower half are guided by a connecting platform, the bottom outlet of the pull-riveting nozzle shell is provided with a limiting platform matched with the connecting platform, and the pull-riveting rod can rotate and move up and down in the pull-riveting nozzle shell.

[0034] Preferably, the pull rivet rod is externally sleeved with a spring sleeve, the spring sleeve is movable up and down along the outer wall of the pull rivet rod, the top surface of the spring sleeve abuts against the bottom surface of the lower transmission shaft, and the upper end of the second return spring is limited below the spring sleeve.

[0035] Preferably, the movable gap is 2-3 mm.

[0036] The electric pull rivet gun has the advantages that: the electric cylinder is used instead of the hydraulic cylinder, and no hydraulic pipe is needed, so that no oil leakage occurs; the transmission cooperation of the bearing seat sleeve, the upper transmission shaft, the transmission sleeve, the middle transmission shaft, the lower transmission shaft and the rotation-stopping pin is small in size and stable in transmission; the setting of the proximity switch can detect whether the pull riveting is completed, feed back signals to the pull riveting system and implement monitoring; and the setting of the annular pressure sensor can monitor whether the pulling force required during the pull riveting is within a reasonable range, so that the pull riveting quality is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 It is a perspective view of the embodiment;

[0038] Figure 2 It is a perspective view of the embodiment with part of the gear box shell removed;

[0039] Figure 3 It is a sectional view of the embodiment;

[0040] Figure 4 It is Figure 3 It is a local enlarged view of A in the middle;

[0041] Figure 5 It is Figure 4 It is a perspective view of the embodiment;

[0042] Figure 6 It is a sectional view of the embodiment with part of the shell removed;

[0043] Figure 7 It is a perspective view of the engagement of the driving gear and the driven gear of the embodiment;

[0044] Figure 8 It is an exploded view of the upper transmission shaft and the lower transmission shaft of the embodiment;

[0045] Figure 9 It is a perspective view of the gear sleeve of the embodiment;

[0046] Figure 10 It is a perspective view of the cooperation of the middle transmission shaft, the lower transmission shaft, the rotation-stopping pin and the pull rivet rod of the embodiment;

[0047] Figure 11 It is an exploded view of the middle transmission shaft, the lower transmission shaft, the rotation-stopping pin and the pull rivet rod of the embodiment;

[0048] Figure 12The exploded view of the stop pin and the pull-rivet rod in this embodiment;

[0049] Figure 13 The exploded view of the stop pin and the pull-rivet rod in this embodiment.

[0050] In the drawings:

[0051] 10, housing assembly; 11, tubular housing; 12, gear box housing; 13, conical sleeve housing; 14, pull-rivet housing; 15, pull-rivet nozzle housing; 15a, limiting platform;

[0052] 20, electric cylinder; 21, telescopic shaft; 22, annular pressure sensor;

[0053] 30, bearing seat sleeve;

[0054] 40, upper transmission shaft; 40a, transmission shaft bearing groove; 40b, limiting flange; 41, upper bearing set; 41a, first upper bearing; 41b, second upper bearing; 41c, third upper bearing; 42, insertion slot; 43, proximity switch; 44, through hole; 45, first meshing gear ring; 46, gear sleeve; 46a, second meshing gear ring; 46b, flange ring; 46c, bearing mounting groove; 47, gear bearing;

[0055] 50, transmission sleeve; 51, hanging platform; 52, movable gap;

[0056] 60, middle transmission shaft; 61, boss; 62, insertion block; 63, trigger body;

[0057] 70, lower transmission shaft; 71, spring mounting groove; 72, longitudinal waist hole;

[0058] 80, stop pin; 81, limiting rod; 82, first reset spring; 83, polygonal transmission column;

[0059] 90, pull-rivet rod; 91, polygonal connecting groove; 92, connecting platform;

[0060] 100, electric motor; 101, driving gear; 102, driven gear; 103, bolt;

[0061] 110, second reset spring; 111, spring sleeve. DETAILED DESCRIPTION

[0062] The preferred embodiments of the present application are described in detail below with reference to the accompanying drawings, so that the advantages and features of the present application can be more easily understood by those skilled in the art, and the scope of protection of the present application is more clearly defined.

[0063] Referring to Figures 1 to 13 the drawings, the present embodiment discloses an electric pull-rivet gun, which comprises:

[0064] The shell assembly 10;

[0065] The electric cylinder 20 is installed at the upper end of the shell assembly 10, and an annular pressure sensor 22 is arranged on the telescopic shaft 21 of the electric cylinder 20. The annular pressure sensor 22 can be a JHHM-4 weighing hollow hole force sensor.

[0066] The bearing seat 30 is located in the shell assembly 10, and the upper end thereof is fixedly connected with the end of the telescopic shaft 21 of the electric cylinder 20. The bearing seat 30 can move up and down.

[0067] The upper transmission shaft 40 is rotatably arranged in the lower half of the bearing seat 30. The upper end of the upper transmission shaft 40 is not connected with any component, so as to ensure that the upper transmission shaft 40 is disconnected with the telescopic shaft 21. When the upper transmission shaft 40 rotates, the telescopic shaft 21 will not rotate with it. The lower end of the upper transmission shaft 40 extends out of the bearing seat 30. The upper transmission shaft 40 extending out of the bearing seat 30 is fixedly provided with a driven gear 102. The top of the upper transmission shaft 40 is provided with a proximity switch 43. A through hole 44 is arranged through the upper transmission shaft 40 below the proximity switch 43.

[0068] The motor 100 is fixedly installed on the shell assembly 10. The output shaft of the motor 100 is provided with a driving gear 101. The driving gear 101 is engaged with the driven gear 102.

[0069] The transmission sleeve 50 is threadedly connected with the lower end of the upper transmission shaft 40.

[0070] The middle transmission shaft 60 is hung on the inner wall of the lower end of the transmission sleeve 50, and a movable gap 52 of 2-3 mm is left between the middle transmission shaft 60 and the transmission sleeve 50. The top of the middle transmission shaft 60 is inserted into the bottom of the upper transmission shaft 40. The middle transmission shaft 60 can move in the movable gap 52. The top of the middle transmission shaft 60 is provided with a trigger body 63. The trigger body 63 penetrates through the through hole 44 of the upper transmission shaft 40, and can move towards the proximity switch 43 until the proximity switch 43 senses the trigger body 63.

[0071] The lower transmission shaft 70 is threadedly connected with the lower end of the middle transmission shaft 60.

[0072] The rotation-stopping pin 80 is elastically connected between the top of the rotation-stopping pin 80 and the lower transmission shaft 70.

[0073] The pull rivet rod 90 is provided with the bottom of the rotation-stopping pin 80 inserted into the top thereof. The rotation-stopping pin 80 and the pull rivet rod 90 can move up and down in the axial direction. The pull rivet rod 90 and the rotation-stopping pin 80 can rotate synchronously. The outer wall of the upper end of the pull rivet rod 90 is threadedly connected with the inner wall of the lower end of the lower transmission shaft 70. The lower end of the pull rivet rod 90 extends out of the bottom of the shell assembly 10.

[0074] The second reset spring 110 is sleeved on the pull rivet rod 90, the upper end of the second reset spring 110 abuts against the bottom of the lower transmission shaft 70, and the lower end of the second reset spring 110 is limited on the inner wall of the shell assembly 10.

[0075] As shown in Figure 1 , Figure 3 , the shell assembly 10 of the embodiment comprises:

[0076] The tubular shell 11, the bearing seat sleeve 30 is located in the tubular shell 11;

[0077] The gear box shell 12, the gear box shell 12 is detachably installed at the lower end of the tubular shell 11, the lower end of the upper transmission shaft 40 passes through the gear box shell 12, the driven gear 102 is located in the gear box shell 12, and the motor 100 is installed on one side of the gear box shell 12;

[0078] The conical sleeve shell 13, the conical sleeve shell 13 is installed at the bottom of the gear box shell 12, the lower end of the upper transmission shaft 40 extends into the conical sleeve shell 13, and the transmission sleeve 50 is located in the conical sleeve shell 13;

[0079] The pull rivet shell 14, the pull rivet shell 14 is detachably installed at the bottom of the conical sleeve shell 13, the lower end of the transmission sleeve 50 extends into the pull rivet shell 14, the middle transmission shaft 60 and the lower transmission shaft 70 are located in the pull rivet shell 14, and the lower end of the second reset spring 110 is limited on the bottom wall of the shell assembly 10;

[0080] The pull rivet nozzle shell 15, the pull rivet nozzle shell 15 is detachably installed at the bottom of the pull rivet shell 14, the pull rivet rod 90 is located in the pull rivet nozzle shell 15, and the lower end of the pull rivet rod 90 extends out of the pull rivet nozzle shell 15.

[0081] As shown in Figure 7 , Figure 8 , the upper end of the upper transmission shaft 40 is rotatably arranged in the bearing seat sleeve 30 through the upper bearing set 41, and the upper bearing set 41 comprises:

[0082] The first upper bearing 41a, the top of the upper transmission shaft 40 is provided with a circle of transmission shaft bearing grooves 40a, and the first upper bearing 41a is installed in the transmission shaft bearing grooves 40a;

[0083] The second upper bearing 41b, a circle of limiting flanges 40b is arranged on the side wall of the upper end of the upper transmission shaft 40, and the second upper bearing 41b is arranged above the limiting flanges 40b;

[0084] The third upper bearing 41c, the third upper bearing 41c is arranged below the limiting flanges 40b.

[0085] As shown in Figure 8As shown, the outer wall of the upper transmission shaft 40 is integrally formed with a first meshing gear ring 45 with longitudinally extending gear slots, the first meshing gear ring 45 is externally sleeved with a gear sleeve 46, the inner wall of the gear sleeve 46 is provided with a second meshing gear ring 46a engaged with the first meshing gear ring 45, the outer part of the gear sleeve 46 is provided with a flange ring 46b, and the flange ring 46b is fixedly connected with the driven gear 102 through a bolt 103. The driven gear 102 is movably connected with the upper transmission shaft 40 through the gear sleeve 46, and the first meshing gear ring 45 and the second meshing gear ring 46a are arranged in cooperation, the gear slots of the first meshing gear ring 45 extend longitudinally, which can ensure that the upper transmission shaft 40 can move up and down in the gear sleeve 46 while being driven to rotate by the second meshing gear ring 46a of the gear sleeve 46.

[0086] As shown in Figure 8 , Figure 9 , the upper end and the lower end of the outer wall of the gear sleeve 46 are provided with bearing mounting grooves 46c, and each bearing mounting groove 46c is provided with a gear bearing 47.

[0087] As shown in Figure 4 , Figure 10 , Figure 11 , the upper end of the middle transmission shaft 60 is provided with a ring-shaped boss 61, and the inner wall of the lower end of the transmission sleeve 50 is provided with a ring-shaped hanging platform 51, and the boss 61 is hung on the hanging platform 51.

[0088] As shown in Figure 10 , Figure 11 , the top of the middle transmission shaft 60 is provided with an insertion block 62, and as shown in Figure 8 , the bottom of the upper transmission shaft 40 is provided with an insertion slot 42, and the insertion block 62 and the insertion slot 42 in this embodiment are in a linear shape, and of course other polygonal shapes or special shapes can also be used, as long as the middle transmission shaft 60 can drive the upper transmission shaft 40 to rotate, the insertion block 62 extends into the insertion slot 42, and the insertion block 62 can move in the insertion slot 42, and the moving distance is the movement gap 52.

[0089] As shown in Figure 6 , the bottom of the lower transmission shaft 70 is provided with a spring mounting groove 71, and a first return spring 82 is mounted between the spring mounting groove 71 and the top of the rotation-stopping pin 80.

[0090] As shown in Figure 10 , Figure 11 , the opposite sides of the spring mounting groove 71 are provided with longitudinal waist holes 72, and the rotation-stopping pin 80 is provided with a transverse limiting rod 81 penetrating through, and the two ends of the limiting rod 81 are respectively inserted into the two longitudinal waist holes 72.

[0091] As shown in Figure 11As shown, the bottom of the anti-rotation pin 80 is provided with a polygonal transmission column 83, and the top of the rivet rod 90 is provided with a polygonal connecting groove 91. The polygonal connecting groove 91 allows the polygonal transmission column 83 to be inserted, and the polygonal transmission column 83 can move up and down within the polygonal connecting groove 91.

[0092] like Figure 13 As shown, the upper half of the rivet rod 90 has a larger diameter than the lower half. The upper half and the lower half are guided by the connecting platform 92. The bottom outlet of the rivet nozzle housing 15 is provided with a limiting platform 15a that matches the connecting platform 92. The rivet rod 90 can rotate (circumferential rotation) and move up and down (axial movement) within the rivet nozzle housing 15.

[0093] A spring sleeve 111 is fitted on the outside of the rivet rod 90. The spring sleeve 111 can move up and down along the outer wall of the rivet rod 90. The top surface of the spring sleeve 111 abuts against the bottom surface of the lower drive shaft 70. The upper end of the second return spring 110 is limited below the spring sleeve 111.

[0094] The working principle of this embodiment is as follows:

[0095] Before riveting, in the initial state, the elastic force of the second return spring 110 in its natural state forces the spring sleeve 111 to move upward. Under the action of the spring sleeve 111, the transmission shaft 70 moves upward. Under the action of the lower transmission shaft 70, the middle transmission shaft 60 moves upward. The boss 61 of the middle transmission shaft 60 first pulls away from the mounting plate 51 at the lower end of the transmission sleeve 50 until the middle transmission shaft 60 can no longer move relative to the transmission sleeve 50, forming an activity gap of 2-3mm. The trigger body 63 at the top of the middle transmission shaft 60 also moves upward and approaches the proximity switch 43.

[0096] During riveting, after the rivet rod 90 of the electric rivet gun moves above the rivet nut to be riveted in coordination with the servo linear module, the rivet rod 90 is driven to rotate, and the rivet nut is driven to perform the riveting action. Then, the rivet nut at the bottom of the rivet rod 90 is pulled up, causing the rivet nut to deform and complete the riveting action.

[0097] The action principle of the pull rivet rod 90 rotating is that the motor 100 drives the driving gear 101 to rotate, the driven gear 102 engaged with the driving gear 101 rotates, the gear sleeve 46 fixed with the driven gear 102 rotates, the first engagement gear ring 45 and the second engagement gear ring 46a are engaged to drive the upper transmission shaft 40 to rotate in the first direction, the bearing seat sleeve 30 does not rotate with the upper transmission shaft 40 due to the arrangement of the upper bearing set 41, the upper transmission shaft 40 drives the middle transmission shaft 60 to rotate in the first direction through the cooperation of the T-shaped insertion block 62 and the insertion slot 42 in the embodiment, and the lower transmission shaft 70 fixed with the middle transmission shaft 60 at the bottom rotates, the stop pin 80 is forced to rotate because the limiting rod 81 of the stop pin 80 passes through the longitudinal waist hole 72 of the spring installation slot 71, and the stop pin 80 drives the polygonal connection slot 91 at the top of the pull rivet rod 90 through the polygonal transmission column 83 at the bottom to make the pull rivet rod 90 also rotate in the first direction, and the rivet nut is pulled up.

[0098] The action principle of the pull rivet rod 90 rotating is that the motor 100 drives the driving gear 101 to rotate, the driven gear 102 engaged with the driving gear 101 rotates, the gear sleeve 46 fixed with the driven gear 102 rotates, the first engagement gear ring 45 and the second engagement gear ring 46a are engaged to drive the upper transmission shaft 40 to rotate in the first direction, the bearing seat sleeve 30 does not rotate with the upper transmission shaft 40 due to the arrangement of the upper bearing set 41, the upper transmission shaft 40 drives the middle transmission shaft 60 to rotate in the first direction through the cooperation of the T-shaped insertion block 62 and the insertion slot 42 in the embodiment, and the lower transmission shaft 70 fixed with the middle transmission shaft 60 at the bottom rotates, the stop pin 80 is forced to rotate because the limiting rod 81 of the stop pin 80 passes through the longitudinal waist hole 72 of the spring installation slot 71, and the stop pin 80 drives the polygonal connection slot 91 at the top of the pull rivet rod 90 through the polygonal transmission column 83 at the bottom to make the pull rivet rod 90 also rotate in the first direction, and the rivet nut is pulled up.

[0099] After the pull rivet rod 90 is pulled, the servo linear module is reset.

[0100] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application, and any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. An electrically powered rivet gun characterized by: The utility model relates to a kind of automatic reset type hydraulic pressure sensor, including: Shell assembly (10); Electric cylinder (20), the electric cylinder (20) is installed in the upper end of shell assembly (10), annular pressure sensor (22) is provided on the telescopic shaft (21) of the electric cylinder (20); Bearing bush (30), the bearing bush (30) is located in shell assembly (10), and its upper end is fixedly connected with the end of the telescopic shaft (21) of the electric cylinder (20), the bearing bush (30) can move up and down; Upper transmission shaft (40), the upper end of the upper transmission shaft (40) is rotatably arranged in the lower half section of bearing bush (30), the lower end of the upper transmission shaft (40) extends out of bearing bush (30), the upper transmission shaft (40) is fixed on the driving gear (102) extending out of the bearing bush (30), the top of the upper transmission shaft (40) is provided with proximity switch (43); Motor (100), the motor (100) is fixedly installed on shell assembly (10), the output shaft of the motor (100) is provided with driving gear (101), and the driving gear (101) is engaged with driven gear (102); Transmission sleeve (50), the upper end of the transmission sleeve (50) is threadedly connected with the lower end of the upper transmission shaft (40); Middle transmission shaft (60), the upper end of the middle transmission shaft (60) is hung in the lower end of the inner wall of transmission sleeve (50), and an activity gap (52) is left between the two, the top of the middle transmission shaft (60) is inserted in the bottom of the upper transmission shaft (40), the middle transmission shaft (60) can move in the activity gap (52), the top of the middle transmission shaft (60) is provided with trigger body (63), the trigger body (63) penetrates the upper transmission shaft (40) and can move towards proximity switch (43); Lower transmission shaft (70), the upper end of the lower transmission shaft (70) is threadedly connected with the lower end of the middle transmission shaft (60); Rotation-stopping pin (80), the top of the rotation-stopping pin (80) is elastically connected with the lower transmission shaft (70); Pull rivet rod (90), the top of the pull rivet rod (90) is inserted into the bottom of the rotation-stopping pin (80), the rotation-stopping pin (80) and the pull rivet rod (90) can move up and down relative in axial direction, the pull rivet rod (90) and the rotation-stopping pin (80) can rotate synchronously, the outer wall of the upper end of the pull rivet rod (90) is threadedly connected with the inner wall of the lower end of the lower transmission shaft (70), and the lower end of the pull rivet rod (90) extends out of the bottom of shell assembly (10); Second reset spring (110), the second reset spring (110) is sleeved on the pull rivet rod (90), and the upper end thereof abuts against the bottom of the lower transmission shaft (70), and the lower end thereof is limited on the inner wall of shell assembly (10).

2. The electric powered rivet gun of claim 1, wherein: The shell assembly (10) includes: Tubular shell (11), the bearing bush (30) is located in tubular shell (11); Gear box shell (12), the gear box shell (12) is detachably installed in the lower end of tubular shell (11), the lower end of the upper drive shaft (40) passes through the gear box shell (12), the driven gear (102) is located in the gear box shell (12), the motor (100) is installed in the side of gear box shell (12); Conical sleeve shell (13), the conical sleeve shell (13) is installed at the bottom of gear box shell (12), the lower end of the upper drive shaft (40) extends into the conical sleeve shell (13), the transmission sleeve (50) is located in the conical sleeve shell (13); Pull the riving nut shell (14), the pull riving nut shell (14) is detachably installed at the bottom of conical sleeve shell (13), the lower end of the transmission sleeve (50) extends into the pull riving nut shell (14), the middle transmission shaft (60), the lower transmission shaft (70) is located in the pull riving nut shell (14), the lower end of the second return spring (110) is limited on the bottom wall of shell assembly (10); Pull the riving nut shell (15), the pull riving nut shell (15) is detachably installed at the bottom of pull riving nut shell (14), the pull riving rod (90) is located in the pull riving nut shell (15), and the lower end thereof extends out of the pull riving nut shell (15).

3. The electric powered pull riv gun of claim 1, wherein: The upper end of the upper drive shaft (40) is rotatably arranged in the bearing seat sleeve (30) through the upper bearing set (41), and the upper bearing set (41) comprises: First upper bearing (41a), the top of the upper drive shaft (40) is provided with a circle of transmission shaft bearing groove (40a), and the first upper bearing (41a) is installed in the transmission shaft bearing groove (40a); Second upper bearing (41b), a circle of limiting flange (40b) is arranged on the side wall of the upper end of the upper drive shaft (40), and the second upper bearing (41b) is arranged above the limiting flange (40b); Third upper bearing (41c), the third upper bearing (41c) is arranged below the limiting flange (40b).

4. The electric powered rivet gun of claim 1, wherein: The outer wall of the upper drive shaft (40) is integrally formed with a first meshing gear ring (45) with a longitudinal extending gear slot, the first meshing gear ring (45) is sleeved with a gear sleeve (46) outside, the inner wall of the gear sleeve (46) is provided with a second meshing gear ring (46a) meshing with the first meshing gear ring (45), the outer part of the gear sleeve (46) is provided with a flange ring (46b), and the flange ring (46b) is fixed with the driven gear (102) through bolt locking.

5. The electric powered pull riv gun of claim 4, wherein: The upper end and the lower end of the outer wall of the gear sleeve (46) are provided with bearing mounting grooves (46c), and each bearing mounting groove (46c) is provided with a gear bearing (47).

6. The electric powered pull riv gun of claim 1, wherein: The upper end of the middle transmission shaft (60) is provided with a circle of boss (61), the inner wall of the lower end of the transmission sleeve (50) is provided with a circle of hanging platform (51), the boss (61) is hung on the hanging platform (51), and the movable gap (52) is formed between the boss (61) and the hanging platform (51).

7. The electric powered pull riv gun of claim 1, wherein: The top of the middle transmission shaft (60) is provided with an insertion block (62), the bottom of the upper transmission shaft (40) is provided with an insertion slot (42), the insertion block (62) extends into the insertion slot (42), and the insertion block (62) can move in the insertion slot (42) by a distance of the movable gap (52).

8. The electric powered pull riv gun of claim 1, wherein: The bottom of the lower transmission shaft (70) is provided with a spring mounting slot (71), and a first reset spring (82) is mounted between the spring mounting slot (71) and the top of the rotation-stopping pin (80).

9. The electric powered pull riv gun of claim 8, wherein: The opposite sides of the spring mounting slot (71) are provided with longitudinal waist holes (72), the rotation-stopping pin (80) is provided with a transverse limiting rod (81) penetrating therethrough, and the two ends of the limiting rod (81) are respectively inserted into the two longitudinal waist holes (72).

10. The electric powered pull riv gun of claim 1, wherein: The bottom of the rotation-stopping pin (80) is provided with a polygonal transmission column (83), the top of the pull-riveting rod (90) is provided with a polygonal connecting slot (91), the polygonal connecting slot (91) can accommodate the polygonal transmission column (83), and the polygonal transmission column (83) can move up and down in the polygonal connecting slot (91).

11. The electric powered pull riv gun of claim 2, wherein: The upper half of the pull-riveting rod (90) has a larger diameter than the lower half, the upper half and the lower half are guided by a connecting table (92), the bottom outlet of the pull-riveting nozzle shell (15) is provided with a limiting table (15a) matched with the connecting table (92), and the pull-riveting rod (90) can rotate and move up and down in the pull-riveting nozzle shell (15).

12. The electric powered pull riv gun of claim 11, wherein: The pull-riveting rod (90) is externally provided with a spring sleeve (111), the spring sleeve (111) can move up and down along the outer wall of the pull-riveting rod (90), the top surface of the spring sleeve (111) abuts against the bottom surface of the lower transmission shaft (70), and the upper end of the second reset spring (110) is limited below the spring sleeve (111).

13. The electric powered pull riv gun of claim 1, wherein: The movable gap (52) is 2-3 mm.

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