Belt-type servo rivet joint device

Abstract

To provide a belt-type servo rivet joint device.SOLUTION: This rivet joint device comprises: a C-shaped frame; a power mechanism; a conveyance mechanism; a feed mechanism; a traction mechanism; and a guide mechanism. The feed mechanism is connected to the power mechanism, and the belt output end of the conveyance mechanism is connected through a belt passage of the feed mechanism via a guide tube to the traction mechanism. The tail end of a punch hole is fitted to the guide mechanism, and a rivet is fed to a die via the guide mechanism, thus completing joining of the rivet to an object to be joined. Precise positioning with respect to the rivet is completed twice by combining the conveyance mechanism, the feed mechanism, and the traction mechanism. A positioning mechanism serves as a guide and a position limit with respect to a punch rod punched downward, and the probability of striking position shifting is lowered. When there is no rivet in a fitting hole, the punch rod does not strike a rivet until the head side edge of a next rivet abuts against a sensitive plate free end, and thus the probability of air-striking of the punch rod is lowered, and quality of a rivet joint is guaranteed.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a riveting device, and more particularly to a belt-type servo riveting device. [Background technology]

[0002] Riveting technology using self-piercing rivets (SPR) is a widely used and extremely important joining process in the automotive manufacturing industry. It is primarily used to join two or more metal components. By applying pressure to the rivet, it penetrates the joined components and forms an internal mechanical lock, achieving a solid mechanical joint. Accurate rivet positioning is essential to ensure the quality and stability of riveting. Current riveting equipment typically uses a pneumatic or hydraulic device to drive the rivet feed belt and a specialized jig to grip and position the rivet in one go before feeding it into the joined components. While this positioning method is simple and convenient for production, it has a high probability of punch position misalignment. It is difficult to ensure accurate rivet positioning by relying on a single positioning operation during the dynamic changes that occur during rivet penetration and locking. This hinders riveting quality and production efficiency. Summary of the Invention [Problem to be solved by the invention]

[0003] The present invention aims to solve the problems raised in the "Background Art" section above by providing a belt-type servo riveting device, namely, that in conventional technology, a specialized jig is used to grip and position the rivet in one go before feeding the rivet into the material to be joined, which means there is a high probability of the punch rod striking position being misaligned, and it is difficult to ensure the accuracy of the rivet position by relying only on one positioning during the dynamic change process as the rivet penetrates and locks, making it impossible to guarantee the quality and production efficiency of riveting.

[0004] In the above, the rivet used is typically a self-piercing rivet (SPR). [Means for solving the problem]

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] This belt-type servo riveting device includes a C-frame, a power mechanism, a transport mechanism, a feed mechanism, a traction mechanism, and a guide mechanism. The rivet is, for example, a self-piercing rivet (SPR). A vertical through-hole is provided in the upper part of the open side of the C-frame, and a die for attaching the workpiece to be riveted is provided correspondingly below the hole. The transport mechanism is fixed to the upper transition section of the non-open side of the C-frame via a vertical pillar.

[0007] The conveying mechanism includes a roller and a reel. The reel engages with the outside of the roller, and a belt is wound around the reel. The belt is provided with a row of mounting holes arranged at equal intervals along a center line, with rivets installed corresponding to each mounting hole, and a row of positioning holes arranged at equal intervals on each side of the belt's edge, with positions corresponding to each other. The positioning holes and the mounting holes are spaced apart from each other and are evenly spaced apart. A coil spring is provided within the roller to rotate the reel in reverse in conjunction with the reel, The feeding mechanism includes a feed body, a punch rod, and a positioning mechanism. The feed body includes an upper cylinder and a support, and a through-punch hole coaxial with the upper cylinder is provided in the support, and the punch rod passes through the punch hole.

[0008] The output end of the power mechanism passes vertically through the through-hole and is connected to the input end of the punch rod, and the upper cylinder is fitted onto the lower end of the power mechanism.

[0009] An arm is attached facing upward on the belt discharge direction side of the upper part of the support, the traction mechanism is fixedly connected to the arm, and grooves for attaching the positioning mechanisms are provided on both sides of the belt conveyance direction of the lower part of the support.

[0010] A belt path is provided near the ends of the grooves located on both sides of the lower part of the support, and the lower end of the positioning mechanism restricts the position of the punch rod moving downward and the rivet below the punch rod. The belt output end of the conveying mechanism passes through the belt path via a guide tube and is connected to the traction mechanism. The end of the punch hole is fitted into the guide mechanism, and the rivet is sent to the die via the guide mechanism, completing the riveting with the material to be joined.

[0011] As a preferred technical solution of the present invention, the positioning mechanism includes a first limit block, a second limit block, a locking member, a sensing plate, and a sensor. The groove is divided into a first groove and a second groove, the first groove being located on the belt supply port side of the support, and the second groove being located on the belt discharge port side of the support. The first limit block abuts against the locking member and is attached in the first groove, and the second limit block abuts against the sensing plate and is attached in the second groove.

[0012] The first limit block includes a first limit body, and a first extension portion is provided on the belt conveying direction side of the lower end of the first limit body, and a first arch-shaped abutment edge is provided on the first extension portion corresponding to the outer periphery of the rivet head edge portion.

[0013] An inclined protrusion is provided on one side of the bottom end of the first limit body, the locking member is placed on the inclined protrusion and fixedly connected to the first limit body, and a notched locking portion is provided at the bottom end of the locking member, and when the belt is pulled back by the reaction force of the coil spring, the notched locking portion catches on the positioning hole.

[0014] The second limit block includes a second limit body, and a second extension portion is provided on the opposite side of the belt conveyance direction from the lower end of the second limit body, and the second extension portion is provided with a second arch-shaped abutment edge symmetrical to the first arch-shaped abutment edge, and a sliding groove is provided from the arch-shaped abutment edge to the second extension portion along the center line of the belt conveyance direction.

[0015] The first arcuate abutment edge and the second arcuate abutment edge are vertically offset.

[0016] The sensing plate has a top end, wing tips, and a bottom free end. A torsion spring is fitted to the top end of the sensing plate, which is rotatably connected to the second limit body. When the head edge of a rivet on the belt presses against the free end during belt conveyance, the sensing plate slides in the conveyance direction within the sliding groove until the wing tips of the sensing plate come into contact with the sensor attached to the second limit body.

[0017] Furthermore, a rivet abutment is provided at the free end, and the rivet abutment and the wing tip extend in opposite directions, so that the head edge of the rivet on the belt presses against the rivet abutment during belt transport.

[0018] The roller further includes a member storage tube, a main shaft, and a rotating shaft. The main shaft penetrates the member storage tube, with one end of the main shaft fitted onto the rotating shaft and the other end of the main shaft extending from the neck of the member storage tube and connected to a fixed shaft. The fixed shaft is fixed to the upright post, and a bearing is further provided between the member storage tube and the main shaft. A position limiting shaft is connected to the end of the rotating shaft away from the main shaft, and the coil spring is fitted onto the position limiting shaft. A number of engaging devices for connecting reels are provided evenly distributed around the rear outer periphery of the member storage tube, and an end cover is provided on the rear end surface.

[0019] The towing mechanism further includes a first cylinder, a gear, and a towing base fixed on the arm, the towing base having a towing shaft mounted therein, the gear mounted on the towing shaft, and the first cylinder fixedly connected to the outside of the towing base, which drives the towing shaft to rotate.

[0020] Furthermore, the gears are two-row gears, the pitch of each gear in the two-row gears is the same as the pitch of adjacent positioning holes in the belt conveying direction, and the distance between the gears in the two rows is the same as the distance between the rows of positioning holes on the belt edge.

[0021] In a preferred technical solution of the present invention, the power mechanism includes a power head body, a servo motor connected to the outside of the power head body, and an output end of the servo motor connected to a second timing pulley, a planetary roller screw installed in the power head body, the planetary roller screw with a lead nut fitted thereon penetrates the power head body, and a thrust bearing is fixedly installed in the power head body, the thrust bearing is fitted on the planetary roller screw and is located at both ends of the lead nut.

[0022] A first timing pulley is fitted onto the screw nut, and the first timing pulley is connected to the second timing pulley via a timing belt, and a tension pulley is provided on the outside of the timing belt to adjust the tension of the timing belt.

[0023] The servo motor drives and rotates the planetary roller screw via the timing belt, and the planetary roller screw realizes up-and-down movement relative to the power head body in combination with the thrust bearing. A pressure sensor is installed above the thrust bearing, a limit sensor is further installed at the end of the planetary roller screw, and a rotary encoder is further installed at the rear end of the servo motor.

[0024] A preferred technical solution of the present invention further includes a pre-pressing mechanism, wherein a main rod penetrates through the pre-pressing mechanism, the output end of the power mechanism passes through the through-hole in a longitudinal direction and is connected to the input end of the main rod, and the output end of the main rod is connected to the input end of the punch rod.

[0025] A preferred technical solution of the present invention further includes a cutting mechanism, the cutting mechanism being located directly above the traction mechanism and attached to the arm, and the belt passes through the traction mechanism and enters the cutting mechanism.

[0026] A preferred technical solution of the present invention further includes a buffer mechanism, the buffer mechanism including a buffer base, the buffer base is fixed on the upright pole, and its installation direction is at an angle of 90° with the upright pole, and a second cylinder is connected to the bottom end of the buffer base, and the second cylinder is fixed to the non-opening side of the C-shaped frame via a connecting rod.

[0027] In summary, the advantageous effects of the present invention are as follows:

[0028] 1. The belt-type servo riveting device of the present invention completes two precise positioning steps for a rivet (typically a self-piercing rivet) by combining a conveying mechanism, a feeding mechanism, and a traction mechanism. First, the vertical offset between the first and second arched abutment edges on the positioning mechanism serves to guide and limit the position of the punch rod as it punches downward, reducing the likelihood of the punch rod being misaligned. At the same time, the gear pitch of the double-row gear in the traction mechanism and the spacing of the belt positioning holes are set in one-to-one correspondence. This allows the double-row gear and the belt to move synchronously, so that when the double-row gear moves one tooth, the belt also moves one tooth synchronously, allowing the rivet to be joined on the belt to precisely enter the positioning mechanism. When the edge of the rivet head pushes against the rivet abutment at the free end of the sensing plate, the wing tip of the sensing plate contacts the sensor, sending a signal to the traction mechanism, stopping the traction and completing the first positioning step. When the traction mechanism stops pulling, the coil spring in the roller on the transport mechanism pulls the reel to rotate in the reverse direction, and the belt on the reel moves in the opposite direction to the transport direction, causing the notched engaging part to enter the positioning hole as the belt moves in the reverse direction, completing the second positioning and achieving two precise positionings for the rivet.

[0029] 2. In this invention, if there is no rivet in the mounting hole on the belt during belt transport, the edge of the rivet head does not press against the free end of the sensing plate, and the punch rod does not drive the rivet. Only when there is a rivet in the mounting hole does the edge of the rivet head press against the free end of the sensing plate, causing the wing tip of the sensing plate to contact the sensor, which then sends a signal to the traction mechanism to stop the belt movement, and only then does the punch rod drive the rivet. This reduces the probability of the punch rod firing a blank and ensures the quality of riveted joints.

[0030] 3. The present invention installs a pre-pressure mechanism between the power mechanism and the feed mechanism to prevent the driving stroke from becoming too long when the planetary roller screw in the power mechanism is connected to the punch rod, ensuring accurate guidance of the punch rod and preventing deviation of the belt driving position. A pressure sensor is installed in the power mechanism to monitor the rivet driving pressure and prevent overload, and a rotary encoder is used to realize rivet driving displacement, making precise control easy. A buffer mechanism is also installed in the frame to eliminate the inertia of the servo motor's rivet impact. [Brief explanation of the drawings]

[0031] [Figure 1] 1 is a schematic diagram of the overall structure of the present invention. [Figure 2] 1 is a vertical cross-sectional view of the present invention. [Figure 3] 1 is a schematic diagram of a feeding mechanism and a guide mechanism of the present invention. [Figure 4] 2 is a schematic diagram of the positioning mechanism and belt of the present invention. [Figure 5] 1 is a schematic diagram of the structure of a locking member of the present invention. [Figure 6] 1 is a schematic diagram of the traction and cutting mechanism of the present invention. [Figure 7] 1 is a plan cross-sectional view of a power head body of the present invention; [Figure 8] FIG. 2 is a cross-sectional view of a roller of the present invention. [Figure 9] FIG. 2 is a cross-sectional view of the traction mechanism of the present invention. [Figure 10] FIG. 1 is a schematic diagram of the precise positioning of the punch rod of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0032] Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for the purpose of explanation and illustration only and are not intended to limit the present invention.

[0033] It should be noted that, in order to facilitate a thorough understanding of the present invention, many specific details are described in the following description, but the present invention may have other embodiments and modifications thereof, and therefore the scope of protection of the present invention is not limited to the specific examples disclosed below.

[0034] 1 and 2, a belt-type servo riveting device that uses self-piercing rivets (SPR) includes a C-frame 100, a power mechanism 200, a transport mechanism 300, a feed mechanism 400, a traction mechanism 500, and a guide mechanism 800. The guide mechanism 800 can be a guide mechanism for rivet feeding that is already available on the market, such as a guide mechanism that blows air pressure onto the rivet.

[0035] A vertical through hole is provided at the top of the opening side of the C-shaped frame 100, and a die 110 for attaching the material to be riveted is provided correspondingly below the hole, and the transport mechanism 300 is fixed to the upper transition section on the non-opening side of the C-shaped frame 100 via a vertical pillar 6.

[0036] 1 to 8, the conveying mechanism 300 includes a roller 320 and a reel 310, and the reel 310 engages with the outer side of the roller 320. A belt 1 is wound around the reel 310, and the belt 1 is provided with a row of mounting holes 3 arranged at equal intervals along its center line, with rivets 2 installed corresponding to each mounting hole 3. The belt 1 is provided with a row of positioning holes 4 arranged at equal intervals on each side of its edge, with positions corresponding to each other. The positioning holes 4 and the mounting holes 3 are spaced apart from each other and are evenly spaced apart at equal intervals.

[0037] A coil spring 326 is provided in the roller 320 to rotate the reel 310 in the reverse direction in conjunction with the roller 320. The coil spring 326 serves as a power source for a micromachine to rotate the reel 310 in the forward direction to complete one stroke without using electrical energy, and then rotates in the reverse direction to move the belt 1 in the reverse direction of the belt conveyance direction X in conjunction with the roller 320.

[0038] 2 to 6, the feeding mechanism 400 includes a feeding main body 410, a punch rod 420, and a positioning mechanism 430. The feeding main body 410 includes an upper cylindrical body 411 and a support body 412, and a through-punch hole coaxial with the upper cylindrical body 411 is provided in the support body 412.

[0039] The punch rod 420 passes through the punch hole, the output end of the power mechanism 200 passes vertically through the through hole and is connected to the input end of the punch rod 420, and the upper cylinder 411 is fitted to the lower end of the power mechanism 200.

[0040] An arm 5 is attached upward on the belt discharge direction side of the upper part of the support body 412, and the traction mechanism 500 is fixedly connected to the arm 5. Grooves 4120 for attaching the positioning mechanism 430 are provided on both sides of the lower part of the support body 412 in the belt conveying direction X, and belt paths 4121 are provided near the ends of the grooves 4120 located on both sides of the lower part of the support body 412.

[0041] The lower end of the positioning mechanism 430 limits the position of the punch rod 420 moving downward and the rivet 2 below the punch rod 420. The output end of the belt 1 on the conveying mechanism 300 passes through the belt path 4121 via a guide tube 7 and is connected to the pulling mechanism 500, the end of the punch hole 3 is fitted into the guide mechanism 800, and the rivet 2 is sent to the die 110 via the guide mechanism 800 to complete the riveting with the workpieces to be joined.

[0042] As shown in FIG. 3, the positioning mechanism 430 includes a first limit block 431 , a second limit block 433 , a locking member 432 , a sensing plate 434 , and a sensor 435 .

[0043] The groove 4120 is divided into a first groove and a second groove, the first groove being located on the belt supply port side of the support, and the second groove being located on the belt discharge port side of the support. The first limit block 431 abuts against a locking member 432 and is installed in the first groove, and the second limit block 433 abuts against a sensing plate 434 and is installed in the second groove.

[0044] 4, the second limit block 433 includes a second limit body 4330, and a second extension portion 4331 is provided on the side opposite to the belt conveying direction X of the lower end of the second limit body 4330, and the second extension portion 4331 is provided with a second arch-shaped abutment edge 4332 symmetrical to the first arch-shaped abutment edge 4312. A slide groove 4333 is provided from the arch-shaped abutment edge to the second extension portion 4331 along the center line of the belt conveying direction X.

[0045] The sensing plate 434 includes a top end 4340, wing tips 4341, and a bottom free end 4342. A torsion spring 436 is fitted to the top end 4340 of the sensing plate 434, and the top end 4340 is rotatably connected to the second limit body 4330 (the body of the second limit block 433). When the head edge of the rivet 2 on the belt 1 presses against the free end 4342 during the conveyance of the belt 1, the sensing plate 434 slides in the belt conveyance direction X within the sliding groove 4333 until the wing tips 4341 of the sensing plate 434 come into contact with the sensor 435 attached to the second limit body 4330, and the rivet 2 is positioned for the first time.

[0046] When the rivet is driven in and the head edge of the rivet 2 no longer presses against the free end 4342 of the sensing plate 434, the torsion spring 436 returns the sensing plate 434 to its original position, and the wing tip 4341 of the sensing plate 434 moves away from the sensor 435.

[0047] The first limit block 431 includes a first limit body 4310, and a first extension 4311 is provided on the belt conveyance direction X side of the lower end of the first limit body 4310. The first extension 4311 is provided with a first arch-shaped abutment edge 4312 that corresponds to the outer periphery of the peripheral portion of the head of the rivet.

[0048] An inclined protrusion 4313 is provided on one side of the bottom end of the first limit body 4310, and the locking member 432 is placed on the inclined protrusion 4313 and fixedly connected to the first limit body 4310. A notched locking portion 4320 is provided at the bottom end of the locking member 432, and when the belt 1 is pulled back by the reaction force of the coil spring 326, the notched locking portion 4320 gets caught in the positioning hole 4, and a second positioning of the rivet 2 is performed.

[0049] 10, the first arched abutment edge 4312 and the second arched abutment edge 4332 are offset in the vertical direction. Just before the punch rod 420 moves downward and contacts the head of the rivet 2, the first arched abutment edge 4312 positions one side of the punch rod 420, and when the punch rod 420 contacts the head of the rivet 2, the second arched abutment edge 4332 further positions the other side of the punch rod 420 and the edge of the head of the rivet 2, thereby achieving precise positioning of the punch rod 420.

[0050] 4, a rivet abutment 43420 is provided on the free end 4342, and the rivet abutment 43420 and the wing tip 4341 extend in opposite directions, so that the head edge of the rivet 2 on the belt 1 presses against the rivet abutment 43420 during belt transport. If there is no rivet 2 in the mounting hole 3 on the belt 1, the punch rod 420 will not drive in a rivet. Only when the rivet 2 is present in the mounting hole 3 does the head edge of the rivet 2 press against the rivet abutment portion 43420, and the free end 4342 of the sensing plate 434 slides in the conveying direction within the sliding groove 4333 until the wing tip 4341 of the sensing plate 434 comes into contact with the sensor 435, and the sensor 435 sends a signal to the traction mechanism 500 to stop the movement of the belt 1. Only then does the punch rod 420 drive the rivet, thereby preventing the punch rod from driving the rivet 2 into the gap.

[0051] 8, the roller 320 further includes a member receiving tube 322, a main shaft 323, and a rotating shaft 325. The main shaft 323 is installed through the member receiving tube 322, and the rotating shaft 325 is fitted onto one end of the main shaft 323, while the other end of the main shaft 323 extends from the neck of the member receiving tube 322 and is connected to a fixed shaft 321. The fixed shaft 321 is fixed on the upright column 6, and a bearing 328 is further installed between the member receiving tube 322 and the main shaft 323.

[0052] A position limiting shaft 327 is connected to the inside of the end of the rotating shaft 325 away from the main shaft 323, the coil spring 326 is fitted onto the position limiting shaft 327, and a number of engaging devices 329 for connecting reels 310 are provided so as to be evenly distributed around the outer periphery of the rear part of the member storage tube 322. The reels 310 are engaged with the rear part of the member storage tube 322 via the engaging devices 329, and an end cover 330 is provided on the rear end face of the member storage tube 322.

[0053] As shown in Figures 6 and 9, the traction mechanism 500 includes a first cylinder 510, a gear 530, and a traction base 520 fixed on the arm 5, a traction shaft 540 is provided in the traction base 520, the gear 530 is provided on the traction shaft 540, the first cylinder 510 is fixedly connected to the outside of the traction base 520, and the first cylinder 510 drives and rotates the traction shaft 540.

[0054] 9, the gear 530 is a double-row gear, and the pitch of each gear 530 in the double-row gear is the same as the pitch of adjacent positioning holes 4 in the belt conveying direction X. The distance between the gears in the two rows is the same as the distance between the two rows of positioning holes 4 on the edge of the belt 1. After passing through the positioning mechanism 430, the belt 1 moves upward along the arm 5 into the traction base 520, and the two rows of gears 530 on the double-row gear fit into the two rows of positioning holes 4 on the edge of the belt 1. The first cylinder 510 of the traction mechanism 500 is activated, rotating the gears 530 on the traction shaft 540 in conjunction with the rotation of the gears 530, and the belt 1 moves synchronously with the rotation of the gears 530.

[0055] 2 and 7, the power mechanism 200 includes a power head main body 220, to which a servo motor 210 is connected. The output end of the servo motor 210 is connected to a second timing pulley 226. A planetary roller screw 221 is installed within the power head main body 220, and the planetary roller screw 221, to which a lead nut 222 is fitted, penetrates the power head main body 220. A thrust bearing 223 is fixedly installed within the power head main body 220, and the thrust bearing 223 is fitted around the planetary roller screw 221 and located at both ends of the lead nut 222. A first timing pulley 224 is fitted around the lead nut 222, and the first timing pulley 224 is connected to the second timing pulley 226 via a timing belt 225. A tension pulley 227 is installed around the timing belt 225 to adjust the tension of the timing belt 225. The tension of the timing belt 225 is controlled by adjusting the position of the tension pulley 227, and the servo motor 210 drives and rotates the planetary roller screw 221 via the timing belt 225. The planetary roller screw 221, in combination with the thrust bearing 223, achieves up-and-down movement relative to the power head body 220. A pressure sensor 228 is installed above the thrust bearing 223. When the planetary roller screw 221 moves downward, the screw nut 222 exerts upward pressure, which is transmitted to the pressure sensor 228. The pressure sensor 228 sends a signal to the servo motor 210, which operates or turns off depending on the signal value. A limit sensor is further installed at the end of the planetary roller screw 221 to prevent the planetary roller screw 221 from moving beyond its limit position. A rotary encoder (not shown) is further installed at the rear end of the servo motor 210.

[0056] 2, the punch rod 420 further includes a pre-pressing mechanism 900, and a main rod 901 penetrates through the pre-pressing mechanism 900. The output end of the power mechanism 200 passes through the through-hole in the vertical direction and is connected to the input end of the main rod 901, and the output end of the main rod 901 is connected to the input end of the punch rod 420.

[0057] 2, the belt 1 further includes a cutting mechanism 600, which is attached to the arm 5 and located directly above the traction mechanism 500, and the belt 1 passes through the traction mechanism 500 and enters the cutting mechanism 600. The cutting mechanism 600 is used to cut the belt 1 according to requirements.

[0058] 1, the system further includes a buffer mechanism 700, which includes a buffer base 710. The buffer base 710 is fixed on the upright 6, and its installation direction is at an angle of 90° to the upright 6. A second cylinder 720 is connected to the bottom end of the buffer base 710, and the second cylinder 720 is fixed to the non-opening side of the C-shaped frame 100 via a connecting rod 730. The buffer mechanism 700 is used to eliminate the inertia of the rivet impact of the servo motor 210.

[0059] The operating principle of the belt-type servo riveting device using the SPR rivet of this embodiment is as follows.

[0060] A belt 1 with rivets 2 attached thereto is wound around a reel 310 on the conveying mechanism 300. The output end of the belt 1 passes through a guide tube 7, a positioning mechanism 430 below a support 412 of the feeding mechanism 400, and a belt path 4121, then moves upward along an arm 5 on one side of the support 412 into a traction base 520 of the traction mechanism 500, where two rows of positioning holes 4 on the edge of the belt 1 fit into two rows of teeth on a gear 530, and then continues upward into the cutting mechanism 600.

[0061] Servo motor 210 drives screw nut 222 via timing belt 225 to rotate, converting this into vertical linear motion for planetary roller screw 221. When planetary roller screw 221 moves downward and encounters resistance, screw nut 222 transmits the force it receives in the opposite direction to pressure sensor 228. Pressure sensor 228 is used to feed back the pressure generated when planetary roller screw 221 drives rivet 2, and determines whether rivet 2 has completed riveting with the workpieces based on the pressure value. When a predetermined value is reached, pressure sensor 228 sends a signal to servo motor 210, and servo motor 210 determines whether to stop operating based on the received signal.

[0062] In addition, the servo motor 210 rotates in the reverse direction in response to a signal from the pressure sensor 228 to raise the control planetary roller screw 221 .

[0063] To facilitate control of the displacement distance of the rivet 2, a rotary encoder (not shown) is further provided at the rear end of the servo motor 210. The rotation of the planetary roller screw 221 is directly driven by the servo motor 210, and the rotation angle of the servo motor 210 and the movement stroke of the planetary roller screw 221 are fixed. Therefore, the rotation angle of the servo motor 210 is detected by the rotary encoder to identify the movement distance of the planetary roller screw 221, and thereby the displacement value of the rivet 2 can be identified.

[0064] When the first cylinder 510 is activated, the gear 530 on the traction shaft 540 moves by one tooth, and the belt 1 also moves by one tooth in synchronization, and the rivet 2 to be joined on the belt 1 enters the positioning mechanism 430.

[0065] The edge of the head of the rivet 2 pushes and moves the rivet abutment portion 43420 of the free end 4342 of the sensing plate 434, causing it to slide in the sliding groove 4333 in the belt conveying direction X until the wing tip 4341 of the sensing plate 434 comes into contact with the sensor 435, and the sensor 435 transmits a signal to stop the first cylinder 510, completing the first positioning of the rivet 2.

[0066] At this time, the coil spring 326 in the roller 320 on the transport mechanism 300 pulls the reel 310 to rotate it in the reverse direction, causing the belt 1 on the reel 310 to move in the opposite direction to the belt transport direction X, and the notched locking portion 4320 at the end of the locking member 432 in the first limit block 431 enters the positioning hole 4 on the belt 1, completing the second positioning of the rivet 2. In this way, the two precise positionings of the rivet 2 are completed.

[0067] At this time, the servo motor 210 starts, and rotates the screw nut 222 in the forward direction via the timing belt 225, converting it into a downward linear motion of the planetary roller screw 221, which in turn moves the punch rod 420 at its bottom downward in an operative manner, and just before the punch rod 420 contacts the head of the rivet 2, the first arched abutment edge 4312 positions one side of the punch rod 420.

[0068] When the punch rod 420 contacts the rivet 2 head, the second arched abutment edge 4332 provides further positioning against the other side of the punch rod 420 and the rivet 2 head edge, completing the precise positioning of the punch rod 420.

[0069] Punch rod 420 pushes rivet 2 downward, and rivet 2 is sent to die 110 via guide mechanism 800, completing the riveting of the materials to be joined. The pressure generated when punch 420 drives the rivet is fed back to pressure sensor 228, which sends a signal to servo motor 210, which rotates in the opposite direction in response to the signal from pressure sensor 228, controlling the rise of planetary roller screw 221, and when the top of planetary roller screw 221 contacts the limit sensor, the rise of planetary roller screw 221 stops, completing one rivet joining by the belt-type servo riveting device.

[0070] After the riveting is completed, when the head edge of the rivet 2 no longer presses against the free end 4342 of the sensing plate 434, the torsion spring 436 returns the sensing plate 434 to its original position, the wing tip 4341 of the sensing plate 434 moves away from the sensor 435, and the sensor 435 transmits a signal to activate the first cylinder 510 and perform the next riveting.

[0071] It should be understood that the above-described embodiments are one or more embodiments of the present invention, and there are many other embodiments and variations thereof based on the present invention. Any variations and modifications made by those skilled in the art according to the present invention without pioneering innovation fall within the scope of protection of the present invention. [Industrial Applicability]

[0072] The present invention can be advantageously used as a belt-type servo riveting device. [Explanation of symbols]

[0073] 1 belt 2 rivets 3 Mounting holes 4 Positioning holes 5 Arm 6 standing pillars 7 Guide Tube 100 C-frame 110 Die 200 Power mechanism 210 Servo Motor 220 Power head body 221 Planetary Roller Screw 222 screw nut 223 Thrust bearing 224 First timing pulley 225 timing belt 226 Second timing pulley 227 Tension pulley 228 Pressure Sensor 229 Servo motor output terminal 300 Conveyor mechanism 310 reels 320 Roller 321 Fixed axis 322 Component storage tube 323 Main shaft 324 Shock Absorber 325 Rotational Axis 326 Coil Spring 327 Position limit axis 328 Bearings 329 Engagement Device 330 End cover 400 Feeding mechanism 410 Supply Body 411 Upper barrel 412 Support 4120 Groove 4121 Belt passage 420 Punch Rod 430 Positioning mechanism 431 First Limit Block 4310 First Limit Body 4311 First extension 4312 First arched abutment edge 4313 Slanted protrusion 432 Locking member 4320 Notched locking part 433 Second Limit Block 4330 Second Limit Body 4331 Second extension 4332 Second arched abutment edge 4333 Sliding groove 434 Sensing Plate 4340 Apex 4341 Wingtip 4342 Free end 43420 Rivet contact part 435 Sensor 436 Torsion Spring 500 traction mechanism 510 First Cylinder 520 Towing Base 530 Gears 540 Traction axle 600 cutting mechanism 700 Buffer mechanism 710 Buffer Base 720 Second Cylinder 730 connecting rod 800 Guide mechanism 900 Pre-pressure mechanism 901 Main Rod X Belt transport direction

Claims

1. The apparatus includes a C-frame, a power mechanism, a transport mechanism, a feed mechanism, a traction mechanism, and a guide mechanism; A through hole is provided in the upper part of the opening side of the C-shaped frame in the vertical direction, and a die for attaching the riveted material is provided correspondingly to the lower part of the through hole. The transport mechanism is fixed to the upper transition section of the non-opening side of the C-shaped frame via a vertical pillar. The conveying mechanism includes a roller and a reel, the reel is engaged with the outside of the roller, a belt is wound around the reel, the belt is provided with a row of mounting holes arranged at equal intervals along a center line, rivets are installed corresponding to each mounting hole, a row of positioning holes arranged at equal intervals on each side of the edge of the belt is provided with corresponding positions, the positioning holes and the mounting holes are spaced apart and evenly spaced apart, and a coil spring is provided within the roller for rotating the reel in reverse in conjunction with the reel, the feeding mechanism includes a supply body, a punch rod, and a positioning mechanism, the supply body includes an upper cylinder and a support, a through punch hole coaxial with the upper cylinder is formed in the support, the punch rod passes through the punch hole, an output end of the power mechanism passes vertically through the through hole and is connected to an input end of the punch rod, the upper cylinder is fitted to a lower end of the power mechanism, an arm is attached facing upward to the belt discharge direction side of the upper part of the support, the traction mechanism is fixedly connected to the arm, grooves for attaching the positioning mechanisms are formed on both sides of the lower part of the support in the belt conveyance direction, belt paths are formed near the ends of the grooves located on both sides of the lower part of the support, and a lower end of the positioning mechanism restricts the position of the punch rod and the rivet below the punch rod as they move downward, A belt-type servo riveting device characterized in that the belt output end on the conveying mechanism passes through the belt path via a guide tube and is connected to the traction mechanism, the end of the punch hole is fitted into the guide mechanism, and the rivet is fed to a die via the guide mechanism to complete the riveting with the workpiece.

2. the positioning mechanism includes a first limit block, a second limit block, a locking member, a sensing plate, and a sensor; the groove is divided into a first groove and a second groove; the first groove is provided on the belt supply port side of the support body, and the second groove is provided on the belt discharge port side of the support body; the first limit block abuts against the locking member and is attached in the first groove; the second limit block abuts against the sensing plate and is attached in the second groove; the first limit block includes a first limit body, a first extension portion is provided on the belt conveying direction side of the lower end of the first limit body, the first extension portion is provided with a first arch-shaped abutment edge corresponding to the outer periphery of the rivet head edge portion, an inclined protrusion is provided on one side of the bottom end of the first limit body, the locking member is placed on the inclined protrusion and fixedly connected to the first limit body, a notched locking portion is provided on the bottom end of the locking member, and when the belt is pulled back by the reaction force of the coil spring, the notched locking portion is caught in a positioning hole, the second limit block includes a second limit body, and a second extension portion is provided on the side of the lower end of the second limit body in the reverse belt conveyance direction, and a second arch-shaped abutment edge is provided on the second extension portion, the second arch-shaped abutment edge being symmetrical to the first arch-shaped abutment edge, and a slide groove is provided from the arch-shaped abutment edge to the second extension portion along a center line in the belt conveyance direction, the first arcuate abutment edge and the second arcuate abutment edge are vertically offset; 2. The belt-type servo riveting device of claim 1, wherein the sensing plate includes a top end, wing tips, and a bottom free end, the top end of the sensing plate is fitted with a torsion spring and rotatably connected to the second limit body, and when the head edge of a rivet on the belt presses against the free end during belt transport, the sensing plate slides in the sliding groove in the transport direction until the wing tips come into contact with the sensor attached to the second limit body.

3. 3. The belt-type servo riveting device according to claim 2, wherein a rivet abutment is provided at the free end, the rivet abutment and the wing tip extend in opposite directions, and the head edge of the rivet on the belt presses against the rivet abutment during the belt transport process.

4. 2. The belt-type servo riveting device of claim 1, wherein the roller further includes a component storage tube, a main shaft, and a rotating shaft, the main shaft extending through the component storage tube, one end of the main shaft fitted onto the rotating shaft, the other end of the main shaft extending from the neck of the component storage tube and connected to a fixed shaft, the fixed shaft being fixed to the upright column, a bearing further provided between the component storage tube and the main shaft, a position limiting shaft connected to an end of the rotating shaft remote from the main shaft, the coil spring fitted onto the position limiting shaft, a number of engagers for connecting reels provided evenly distributed around the outer periphery of the rear of the component storage tube, and an end cover provided on the rear end face.

5. 2. The belt-type servo riveting device according to claim 1, wherein the traction mechanism includes a first cylinder, a gear, and a traction base fixed on the arm, a traction shaft provided within the traction base, the gear provided on the traction shaft, the first cylinder fixedly connected to the outside of the traction base, and the first cylinder driving and rotating the traction shaft.

6. 6. The belt-type servo riveting device according to claim 5, wherein the gears are double-row gears, the pitch of each gear in the double-row gears is the same as the pitch of adjacent positioning holes in the belt conveying direction, and the distance between the gears in the two rows is the same as the distance between the rows of positioning holes on the belt edge.

7. The power mechanism includes a power head body, a servo motor is connected to the outside of the power head body, and an output end of the servo motor is connected to a second timing pulley; a planetary roller screw is provided within the power head body, the planetary roller screw having a screw nut fitted thereon penetrates the power head body, and thrust bearings are further fixedly provided within the power head body, the thrust bearings being fitted onto the planetary roller screw and positioned at both ends of the screw nut; a first timing pulley fitted onto the screw nut, the first timing pulley connected to the second timing pulley via a timing belt, and a tension pulley for adjusting the tension of the timing belt provided on the outside of the timing belt; the servo motor drives and rotates the planetary roller screw via the timing belt, and the planetary roller screw realizes up-and-down movement relative to the power head body in combination with the thrust bearing; 2. The belt-type servo riveting device according to claim 1, wherein a pressure sensor is provided above the thrust bearing, a limit sensor is further provided at an end of the planetary roller screw, and a rotary encoder is further provided at a rear end of the servo motor.

8. 2. The belt-type servo riveting device according to claim 1, further comprising a pre-pressure mechanism, a main rod extending through the pre-pressure mechanism, an output end of the power mechanism passing vertically through the through hole and connected to an input end of the main rod, and an output end of the main rod connected to an input end of the punch rod.

9. 2. The belt type servo riveting device according to claim 1, further comprising a cutting mechanism, said cutting mechanism being attached to said arm and positioned directly above said traction mechanism, said belt passing through said traction mechanism before entering said cutting mechanism.

10. 2. The belt-type servo riveting device according to claim 1, further comprising a buffer mechanism, the buffer mechanism including a buffer base, the buffer base being fixed on the upright pole with its mounting direction at an angle of 90° to the upright pole, a second cylinder being connected to a bottom end of the buffer base, and the second cylinder being fixed to the non-opening side of the C-shaped frame via a connecting rod.

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