Automatic riveting press for contact silver dot and riveting method

Abstract

The application discloses a contact silver point automatic riveting and pressing machine and a riveting and pressing method, which have good mechanism reliability and uniform riveting and pressing structure. The technical scheme comprises a rotating disc, a workpiece clamp arranged in a circumferential arrangement mode at the edge of the rotating disc, and a rotating divider arranged at the bottom of the rotating disc. A contact feeding mechanism, a silver point feeding mechanism, a riveting and pressing mechanism, and a discharging mechanism are sequentially arranged at the periphery of the rotating disc. The riveting and pressing mechanism comprises a rack, an upper mounting seat, and a lower mounting seat. The upper mounting seat is provided with a transversely arranged first sliding groove and a second sliding groove perpendicular to the first sliding groove. The lower mounting seat is provided with a third sliding groove perpendicular to the second sliding groove.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of automation equipment, and particularly relates to a contact silver point automatic riveting press. BACKGROUND

[0002] The silver point contact is mainly used on the isolating switch, and its structure is shown in the figure, which comprises a bridge contact 69 and silver points 70 riveted at both ends of the contact. At present, the riveting and pressing between the bridge contact and the silver point is usually completed by using a contact silver point automatic riveting press. The structure of the conventional contact silver point automatic riveting press is shown in the Chinese patent for invention with the authorized announcement number of CN 219041004 U and the name of "silver point riveting press", which mainly realizes the riveting and pressing of the silver point by the pressure of the positioning block and the riveting rod oppositely arranged. Figure 16 The main defects are: 1. The riveting mechanism has poor reliability, and the shape of the silver point foot is uneven after being pressed flat, which affects the strength and quality of the product; 2. The stability of the pneumatic finger when clamping the contact is poor, which easily causes the falling and displacement of the contact; 3. When the negative pressure rod sucks the silver point, the position of the silver point is easily inclined due to the instability of the airflow, and then the silver point cannot be accurately loaded into the riveting hole at both ends of the bridge contact. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a contact silver point automatic riveting press and a riveting method, which have good mechanism reliability and uniform riveting structure.

[0004] To solve the above problems, the technical scheme adopted by the present application comprises: a rotating disc, workpiece clamps arranged in a circumferential arrangement manner at the edge of the rotating disc, and a rotating divider arranged at the bottom of the rotating disc, the periphery of the rotating disc is sequentially provided with a contact feeding mechanism, a silver point feeding mechanism, a riveting mechanism and a discharging mechanism, and the riveting mechanism comprises:

[0005] A rack is provided with an upper mounting seat and a lower mounting seat, the upper mounting seat is provided with a transversely arranged first sliding groove and a second sliding groove perpendicular to the first sliding groove, and the lower mounting seat is provided with a vertical third sliding groove;

[0006] A first sliding block is slidably arranged in the first sliding groove of the upper mounting seat, and the front end of the first sliding block is provided with a first inclined surface, and the rear end of the first sliding block is provided with a first cylinder for driving the first sliding block to slide forward and backward;

[0007] A second sliding block is slidably arranged in the second sliding groove of the upper mounting seat, and the upper end of the second sliding block is provided with a second inclined surface matched with the first inclined surface and a first return spring for driving the second sliding block to return upward;

[0008] A third sliding block is slidably arranged in the third sliding groove of the lower mounting seat, and the upper end of the third sliding block is provided with a connecting block, and the lower end of the third sliding block is provided with a second cylinder for driving the third sliding block to slide upward and downward, the connecting block is provided with a sheath mounting hole, and the sheath mounting hole is provided with a positioning step.

[0009] A positioning rod is fixed to the lower end of the second slider and has a silver dot head-shaped cavity at the bottom.

[0010] A sheath is telescopically arranged in the second sheath mounting hole of the connecting block, has a rivet pressing rod mounting hole in the center and a first positioning flange at the lower end.

[0011] A rivet pressing rod is slidably arranged in the rivet pressing rod mounting hole and has a second positioning flange at the lower end abutting against the third slider. A second return spring is arranged between the first and second positioning flanges. A silver dot foot-shaped cavity is formed between the top of the rivet pressing rod and the front end of the rivet pressing rod mounting hole.

[0012] The top of the rivet pressing rod is arranged with a group of four rhombic sharp parts.

[0013] The cross-sectional diameter R1 of the silver dot foot-shaped cavity is greater than the cross-sectional diameter R2 of the silver dot foot.

[0014] The contact head feeding mechanism comprises a first vibrating disc, a contact head conveying channel connected to the discharge port of the first vibrating disc, a pushing rod arranged at the discharge port of the contact head conveying channel, a pushing cylinder driving the pushing rod to move, and a 180° rotary pneumatic finger arranged in front of the pushing rod. The front end of the 180° rotary pneumatic finger is provided with an upper clamping finger and a lower clamping finger. The upper clamping finger is internally provided with a telescopic first pressing block. The upper end of the first pressing block is provided with a third return spring.

[0015] The silver dot feeding mechanism comprises an XY-axis sliding table, a negative pressure rod arranged on the XY-axis sliding table, a silver dot conveying channel arranged below the negative pressure rod, a second vibrating disc connected to the silver dot conveying channel, and a straight vibrator arranged at the lower end of the silver dot conveying channel. The center of the negative pressure rod is provided with an air channel. The lower end of the air channel is provided with a positioning cavity. The side wall of the positioning cavity is provided with a group of circumferentially arranged pressure equalizing grooves.

[0016] A detection and correction mechanism is arranged beside the contact head feeding mechanism. The detection and correction mechanism comprises a pin, a pin cylinder driving the pin to move up and down, and a pressure sensor arranged above the pin. The top of the pin is provided with a conical sharp part.

[0017] A material conveying mechanism is arranged at the discharge port of the silver dot conveying channel. The material conveying mechanism comprises a base, a material conveying slider and a third cylinder. The base is provided with a fourth sliding groove. The material conveying slider is slidably arranged in the fourth sliding groove and is provided with a U-shaped material conveying groove at the side wall. The third cylinder drives the material conveying slider to move forward and backward. When the material conveying slider is moved forward to a position, the U-shaped material conveying groove is aligned with the discharge port of the silver dot conveying channel. When the material conveying slider is moved backward to a position, the side wall of the material conveying slider blocks the discharge port of the silver dot conveying channel.

[0018] The workpiece clamp comprises a fixed clamping plate, a mounting seat arranged on the fixed clamping plate, a movable clamping plate hinged on the mounting seat, and a fourth reset spring arranged between the movable clamping plate and the mounting seat, and plastic protection strips are arranged on both sides of the movable clamping plate.

[0019] A riveting method is realized by the contact silver point automatic riveting machine, and comprises the following steps: before the silver point foot is riveted, the positioning rod is first pressed downward, the silver point head cavity is abutted against the upper end surface of the silver point, the sheath is moved upward, the top of the sheath is abutted against the lower end surface of the bridge type contact, and the silver point foot is arranged in the center of the silver point foot cavity, and finally the riveting rod is pressed upward, and the silver point foot is compressed.

[0020] The length of the silver point foot is compressed by 20%-50%.

[0021] The contact silver point automatic riveting machine and the riveting method have the following advantages: 1. After the silver point foot is compressed, the silver point foot cavity is used for forming, so that the riveting structure is uniform and has good strength; 2. The overall structure stability and reliability of the automatic riveting machine are better, and the workpiece can be more accurately extracted and fixed.

[0022] The application will be further described below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic diagram of the contact silver point automatic riveting machine of the application;

[0024] Figure 2 is a structural schematic diagram of the riveting mechanism of the application;

[0025] Figure 3 is a sectional view of the riveting mechanism of the application;

[0026] Figure 4 is an exploded view of the riveting rod assembly of the application;

[0027] Figure 5 is a partial enlarged view of Figure 3 ;

[0028] Figure 6 is a partial enlarged view of Figure 5 ;

[0029] Figure 7 is a structural schematic diagram of the first sliding block and the second sliding block of the application;

[0030] Figure 8 is a structural schematic diagram of the contact feeding mechanism of the application;

[0031] Figure 9 is a structural schematic diagram of the 180° rotary pneumatic finger of the application;

[0032] Figure 10 is the structural diagram of the first pressing block of the present application;

[0033] Figure 11 is the structural diagram of the silver dot feeding mechanism of the present application;

[0034] Figure 12 is the bottom view of the negative pressure rod of the present application;

[0035] Figure 13 is the structural diagram of the base and the material conveying slider of the present application;

[0036] Figure 14 is the structural diagram of the detection and correction mechanism of the present application;

[0037] Figure 15 is the structural diagram of the workpiece clamp of the present application;

[0038] Figure 16 is the structural diagram of the silver dot contact of the present application.

[0039] Wherein: 1, rotating disc; 2, workpiece clamp; 3, rotating divider; 4, contact feeding mechanism; 5, silver dot feeding mechanism; 6, riveting mechanism; 7, discharging mechanism; 8, frame; 9, first slider; 10, second slider; 11, third slider; 12, positioning rod; 13, sheath; 14, riveting rod; 15, upper mounting seat; 16, lower mounting seat; 17, first sliding groove; 18, second sliding groove; 19, third sliding groove; 20, first inclined surface; 21, first air cylinder; 22, second inclined surface; 23, first return spring; 24, connecting block; 25, second air cylinder; 26, sheath mounting hole; 27, positioning step; 28, silver dot head cavity; 29, riveting rod mounting hole; 30, first positioning flange; 31, second positioning flange; 32, second return spring; 33, silver dot foot cavity; 34, first vibrating disc; 35, contact conveying channel; 36, material pushing rod; 37, material pushing air cylinder; 38, 180° rotating pneumatic finger; 39, upper clamping finger; 40, lower clamping finger; 41, first pressing block; 42, third return spring; 43, XY axis sliding table; 44, negative pressure rod; 45, silver dot conveying channel; 46, straight vibrator; 47, air channel; 48, positioning cavity; 49, pressure equalizing groove; 50, four rhombus tip; 51, conical tip; 52, silver dot foot; 53, detection and correction mechanism; 54, pin; 55, pin air cylinder; 56, pressure sensor; 58, material conveying mechanism; 59, base; 60, material conveying slider; 61, third air cylinder; 62, fourth sliding groove; 63, U-shaped material conveying groove; 64, fixed clamping plate; 65, mounting seat; 66, movable clamping plate; 67, fourth return spring; 68, second vibrating disc; 69, bridge contact; 70, silver dot; 71, plastic protection strip. DETAILED DESCRIPTION Embodiment 1:

[0040] Referring to Figures 1-16 As shown in the drawings, the contact silver point automatic riveting presser of the present application comprises a rotating disc 1, workpiece clamps 2 arranged in a circumferential manner at the edge of the rotating disc 1, and a rotating divider 3 arranged at the bottom of the rotating disc 1. The periphery of the rotating disc 1 is sequentially provided with a contact feeding mechanism 4, a silver point feeding mechanism 5, a riveting mechanism 6, and a discharging mechanism 7. The riveting mechanism 6 comprises a rack 8, a first sliding block 9, a second sliding block 10, a third sliding block 11, a positioning rod 12, a sheath 13, and a riveting rod 14. The upper and lower ends of the rack 8 are respectively provided with an upper mounting seat 15 and a lower mounting seat 16. The upper mounting seat 15 is provided with a transversely arranged first sliding groove 17 and a second sliding groove 18 perpendicular to the first sliding groove 17, and the lower mounting seat 16 is provided with a vertical third sliding groove 19. The first sliding block 9 is slidably arranged in the first sliding groove 17 of the upper mounting seat 15. The front end of the first sliding block 9 is provided with a first inclined surface 20, and the rear end of the first sliding block 9 is provided with a first cylinder 21 for driving the first sliding block 9 to slide forward and backward. The second sliding block 10 is slidably arranged in the second sliding groove 18 of the upper mounting seat 15, and the upper end of the second sliding block 10 is provided with a second inclined surface 22 matched with the first inclined surface 20 and a first return spring 23 for driving the second sliding block 10 to return upward. The first return spring 23 is a tension spring. When the first sliding block 9 is pushed forward by the first cylinder 21, the second sliding block 10 is driven to press downward through the cooperation of the first inclined surface 20 and the second inclined surface 22. Meanwhile, the stability of sliding is ensured through the positioning of the upper mounting seat 15 and the lower mounting seat 16. The third sliding block 11 is slidably arranged in the third sliding groove 19 of the lower mounting seat 16, the upper end of the third sliding block 11 is provided with a connecting block 24, the lower end of the third sliding block 11 is provided with a second cylinder 25 for driving the third sliding block 11 to slide upward and downward, the connecting block 24 is provided with a sheath mounting hole 26, and the sheath mounting hole 26 is provided with a positioning step 27. The positioning rod 12 is fixed at the lower end of the second sliding block 10, and the bottom of the positioning rod 12 is provided with a silver point head-shaped cavity 28 matched with the end surface of a silver point 70. The sheath 13 is telescopically arranged in the second sheath mounting hole 26 of the connecting block 24, the center of the sheath 13 is provided with a riveting rod mounting hole 29, and the lower end of the sheath 13 is provided with a first positioning flange 30 matched with the positioning step 27. The riveting rod 14 is slidably arranged in the riveting rod mounting hole 29, and the lower end of the riveting rod 14 is provided with a second positioning flange 31 abutting against the third sliding block 11, and the first positioning flange 30 and the second positioning flange 31 are provided with a second return spring 32. The top of the riveting rod 14 and the front end of the riveting rod mounting hole 29 form a silver point foot-shaped cavity 33.

[0041] Preferably, the top of the riveting rod 14 is arranged with a set of four rhombic tips 50. The four rhombic tips 50 can more easily pierce into the silver dot foot 52, thereby facilitating the compression of the silver dot foot 52.

[0042] Preferably, the cross-sectional diameter R1 of the silver dot foot cavity 33 is greater than the cross-sectional diameter R2 of the silver dot foot 52. Thus, the silver dot foot 52 after being flattened can be better accommodated. The cross-sectional size of the silver dot foot cavity 33 is determined according to the compression ratio of the silver dot foot 52, and is usually 20%-50% greater than the cross-sectional area of the silver dot foot 52, to facilitate molding and demolding.

[0043] Preferably, the contact feeding mechanism 4 includes a first vibration disc 34, a contact conveying channel 35 connected to the discharge port of the first vibration disc 34, a pushing rod 36 arranged at the discharge port of the contact conveying channel 35, a pushing cylinder 37 driving the movement of the pushing rod 36, and a 180° rotary pneumatic finger 38 arranged in front of the pushing rod 36. The front end of the 180° rotary pneumatic finger 38 is provided with an upper clamping finger 39 and a lower clamping finger 40, the upper clamping finger 39 is internally provided with a retractable first pressing block 41, and the upper end of the first pressing block 41 is provided with a third return spring 42. When the 180° rotary pneumatic finger 38 rotates to the side of the contact conveying channel 35, it is connected to the discharge port of the contact conveying channel 35, and the contact in the contact conveying channel 35 is pushed into the space between the upper clamping finger 39 and the lower clamping finger 40 of the 180° rotary pneumatic finger 38 by the pushing rod 36, and is pressed by the first pressing block 41 to ensure the stability of clamping. Then the 180° rotary pneumatic finger 38 is reversely rotated by 180° to be connected to the workpiece clamp 2, and the contact in the 180° rotary pneumatic finger 38 is pushed into the workpiece clamp 2 by the pushing rod 36.

[0044] Preferably, the silver dot feeding mechanism 5 includes an XY-axis sliding table 43, a negative pressure rod 44 arranged on the XY-axis sliding table 43, a silver dot conveying channel 45 arranged below the negative pressure rod 44, a second vibration disc 68 connected to the silver dot conveying channel 45, and a straight vibrator 46 arranged at the lower end of the silver dot conveying channel 45. The center of the negative pressure rod 44 is provided with an air channel 47, the lower end of the air channel 47 is provided with a positioning cavity 48, and the side wall of the positioning cavity 48 is provided with a set of circumferentially arranged uniform pressure grooves 49. Due to the unevenness of the surface of the silver dot 70, after being sucked by the traditional negative pressure rod, the position of the silver dot is easily inclined due to the instability of the air pressure, thereby failing to be accurately loaded into the riveting hole at the two ends of the bridge-type contact. By arranging a set of circumferentially arranged uniform pressure grooves 49 on the side wall of the positioning cavity 48, the air pressure is more stable, thereby preventing the inclination of the position of the silver dot.

[0045] Preferably, the contact feeding mechanism 4 is provided with a detection and correction mechanism 53 beside it, which includes a needle 54, a needle cylinder 55 driving the needle 54 to move up and down, and a pressure sensor 56 provided above the needle 54. The top of the needle 54 is provided with a conical tip 51. When the workpiece clamp 2 with contacts rotates to the detection and correction mechanism 53 station, the needle cylinder 55 drives the needle 54 to move down. For example, if the needle 54 can be inserted into the riveting holes at both ends of the contact, it indicates normality. At the same time, the inclined surface of the conical tip 51 can correct the slightly displaced contact. For example, if the needle 54 cannot be inserted into the riveting holes at both ends of the contact, it will press the pressure sensor 56. The pressure sensor 56 sends a detection signal to the controller, and the controller issues an alarm and controls each mechanism to stop moving.

[0046] Preferably, the discharge port of the silver dot feeding channel 45 is provided with a material conveying mechanism 58, which includes a base 59, a material conveying slider 60, and a third cylinder 61. The base 59 is provided with a fourth sliding groove 62, and the material conveying slider 60 is slidably installed in the fourth sliding groove 62 and is provided with a U-shaped material conveying groove 63 on the side wall. The third cylinder 61 drives the material conveying slider 60 to move forward and backward. When the material conveying slider 60 moves forward to a position, the U-shaped material conveying groove 63 is aligned with the discharge port of the silver dot feeding channel 45, so that the silver dot 70 can enter the U-shaped material conveying groove 63. Then the material conveying slider 60 moves backward, and when it moves backward to a position, the side wall of the material conveying slider 60 blocks the discharge port of the silver dot feeding channel 45. At this time, the silver dot 70 in the U-shaped material conveying groove 63 can be sucked by the negative pressure rod 44 to realize the carrying of the silver dot 70.

[0047] Preferably, the workpiece clamp 2 includes a fixed clamp plate 64, a mounting seat 65 provided on the fixed clamp plate 64, a movable clamp plate 66 hingedly connected to the mounting seat 65, and a fourth reset spring 67 provided between the movable clamp plate 66 and the mounting seat 65. The movable clamp plate 66 is provided with plastic protection strips 71 on both sides. When the contact is pushed into the fixed clamp plate 64 and the movable clamp plate 66, the movable clamp plate 66 can be pressed against the contact by the action of the fourth reset spring 67 to realize stable clamping. At the same time, the plastic protection strips 71 can protect the surface of the contact from being scratched. Embodiment 2:

[0048] Reference Figures 1-16As shown, a riveting method of the present application is realized by the contact silver dot automatic riveting machine according to embodiment 1, and includes the following steps: before riveting the silver dot foot 52, the positioning rod 12 is first pressed down, the silver dot head cavity 28 is abutted against the upper end surface of the silver dot 70, at the same time, the sheath 13 is moved up, the top thereof is abutted against the lower end surface of the bridge contact 69, and the silver dot foot 52 is placed in the center of the silver dot foot cavity 33, finally, the riveting rod 14 is pressed up, and the silver dot foot 52 is compressed. The length of the silver dot foot 52 is compressed by 20%-50%.

[0049] As described above, the present application is not limited in any form, although the present application has been disclosed above with the preferred embodiments, however, it is not intended to limit the present application, any person skilled in the art can make some changes or modifications to the equivalent embodiments within the scope of the technical solutions of the present application by using the disclosed structures and technical contents, but any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present application, which does not deviate from the content of the technical solutions of the present application, still belongs to the scope of the technical solutions of the present application.

Claims

1. A contact silver dot automatic riveting press, comprising a rotating disc (1), a workpiece clamp (2) arranged in a circumferential arrangement on the edge of the rotating disc (1), and a rotating divider (3) arranged at the bottom of the rotating disc (1), the periphery of the rotating disc (1) is sequentially provided with a contact feeding mechanism (4), a silver dot feeding mechanism (5), a riveting mechanism (6), and a discharging mechanism (7), characterized in that, The riveting mechanism (6) comprises: A rack (8) is provided with an upper mounting seat (15) and a lower mounting seat (16), the upper mounting seat (15) is provided with a transversely arranged first sliding groove (17) and a second sliding groove (18) perpendicular to the first sliding groove (17), and the lower mounting seat (16) is provided with a third sliding groove (19) vertically arranged in the lower mounting seat (16); A first sliding block (9) is slidably arranged in the first sliding groove (17) of the upper mounting seat (15) and is provided with a first inclined surface (20) at the front end and a first cylinder (21) for driving the first sliding block (9) to slide forward and backward at the rear end; A second sliding block (10) is slidably arranged in the second sliding groove (18) of the upper mounting seat (15) and is provided with a second inclined surface (22) at the upper end for cooperating with the first inclined surface (20) and a first reset spring (23) for driving the second sliding block (10) to reset upward; A third sliding block (11) is slidably arranged in the third sliding groove (19) of the lower mounting seat (16) and is provided with a connecting block (24) at the upper end and a second cylinder (25) for driving the third sliding block (11) to slide upward and downward at the lower end, the connecting block (24) is provided with a sheath mounting hole (26) and is provided with a positioning step (27) in the sheath mounting hole (26); A positioning rod (12) is fixed at the lower end of the second sliding block (10) and is provided with a silver dot head-shaped cavity (28) at the bottom; A sheath (13) is telescopically arranged in the second sheath mounting hole (26) of the connecting block (24) and is provided with a riveting rod mounting hole (29) at the center, a first positioning flange (30) at the lower end; A riveting rod (14) is slidably arranged in the riveting rod mounting hole (29) and is provided with a second positioning flange (31) at the lower end for abutting against the third sliding block (11), a second reset spring (32) is arranged between the first positioning flange (30) and the second positioning flange (31), and a silver dot foot-shaped cavity (33) is formed between the top of the riveting rod (14) and the front end of the riveting rod mounting hole (29).

2. The automatic silver contact point riveter as claimed in claim 1, characterized in that: A group of four rhombic pointed portions (50) are arranged at the top of the riveting rod (14).

3. The automatic silver contact point riveter as claimed in claim 1, characterized in that: The cross-sectional diameter R1 of the silver dot foot-shaped cavity (33) is greater than the cross-sectional diameter R2 of the silver dot foot (52).

4. The automatic silver contact dot riveter as claimed in claim 1, wherein: The contact feeding mechanism (4) comprises a first vibrating disc (34), a contact conveying channel (35) connected to the discharge port of the first vibrating disc (34), a pushing rod (36) arranged at the discharge port of the contact conveying channel (35), a pushing cylinder (37) for driving the pushing rod (36) to move, and a 180° rotary pneumatic finger (38) arranged in front of the pushing rod (36); the 180° rotary pneumatic finger (38) is provided with an upper clamping finger (39) and a lower clamping finger (40) at the front end, the upper clamping finger (39) is provided with a first pressing block (41) telescopically arranged in the upper clamping finger (39), and the first pressing block (41) is provided with a third reset spring (42) at the upper end.

5. The automatic silver contact dot riveter as defined in claim 1, wherein: The silver dot feeding mechanism (5) comprises an XY axis sliding table (43), a negative pressure rod (44) arranged on the XY axis sliding table (43), a silver dot feeding channel (45) arranged below the negative pressure rod (44), a second vibrating disc (68) connected with the silver dot feeding channel (45), and a straight vibrator (46) arranged at the lower end of the silver dot feeding channel (45), the center of the negative pressure rod (44) is provided with an air channel (47), the lower end of the air channel (47) is provided with a positioning cavity (48), and a group of circumferentially arranged pressure equalizing grooves (49) are arranged on the side wall of the positioning cavity (48).

6. The automatic silver contact dot riveter as defined in claim 1, wherein: A detection and correction mechanism (53) is arranged beside the contact feeding mechanism (4), the detection and correction mechanism (53) comprises a pin (54), a pin cylinder (55) driving the pin (54) to move up and down, and a pressure sensor (56) arranged above the pin (54), and a conical tip (51) is arranged at the top of the pin (54).

7. The automatic silver contact dot riveter as claimed in claim 5, wherein: A material conveying mechanism (58) is arranged at the discharge port of the silver dot feeding channel (45), the material conveying mechanism (58) comprises a base (59), a material conveying slider (60) and a third cylinder (61), the base (59) is provided with a fourth sliding groove (62), the material conveying slider (60) is slidably arranged in the fourth sliding groove (62) and is provided with a U-shaped material conveying groove (63) on the side wall, the third cylinder (61) drives the material conveying slider (60) to move forward and backward, when the material conveying slider (60) is moved forward to a position, the U-shaped material conveying groove (63) is aligned with the discharge port of the silver dot feeding channel (45); when the material conveying slider (60) is moved backward to a position, the side wall of the material conveying slider (60) is blocked at the discharge port of the silver dot feeding channel (45).

8. The automatic silver contact dot riveter according to claim 1, wherein: The workpiece clamp (2) comprises a fixed clamping plate (64), a mounting seat (65) arranged on the fixed clamping plate (64), a movable clamping plate (66) hinged to the mounting seat (65), and a fourth reset spring (67) arranged between the movable clamping plate (66) and the mounting seat (65), and plastic protection strips (71) are arranged on both sides of the movable clamping plate (66).

9. A method of riveting, implemented by means of the automatic contact silver dot riveter according to any one of claims 1-8, characterized in that, The following steps are included: Before the silver dot foot (52) is riveted and pressed, the positioning rod (12) is first pressed down, the silver dot head cavity (28) is abutted against the upper end surface of the silver dot (70), the sheath (13) is moved up, the top is abutted against the lower end surface of the bridge contact (69), the silver dot foot (52) is arranged in the center of the silver dot foot cavity (33), and finally the riveting rod (14) is pressed up and the silver dot foot (52) is compressed.

10. The method of claim 9, wherein: The length of the silver dot foot (52) is compressed by 20%-50%.

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