CN108838316B

CN108838316B - Full-automatic punching riveting system and working process thereof

Info

Publication number: CN108838316B
Application number: CN201810767860.6A
Authority: CN
Inventors: 卫晓能; 徐从青
Original assignee: Suzhou Keytec Precision Components Co ltd
Current assignee: Suzhou Keytec Precision Components Co ltd
Priority date: 2018-07-13
Filing date: 2018-07-13
Publication date: 2024-02-02
Anticipated expiration: 2038-07-13
Also published as: CN108838316A

Abstract

The invention discloses a full-automatic punching and riveting system, which comprises a punching machine, a die, a feeder, a finished product discharging conveyor belt, a rivet conveying device, a positioning ejection device and a control center, wherein the punching machine is used for punching and riveting a workpiece; the punching machine is an automatic punching machine and is provided with an electronic cam, and the die is a stamping progressive die and comprises an upper die and a lower die; the rivet is conveyed to the corresponding pneumatic ejection gun through the rivet conveying device. When the full-automatic punching and riveting system works, the material belt to be processed is conveyed into a die on the punch press by the feeder, after the riveting holes and other holes are punched on the punching progressive die, a plurality of rivets are conveyed into corresponding riveting holes by the pneumatic ejection gun, riveting is completed by the punching force of the punch press, after all punching, riveting and bending processes are completed on the material belt, products are cut off and slide onto a finished product discharging conveying belt, and the finished product discharging conveying belt is conveyed out of the punch press. The full-automatic punching and riveting system is high in machining efficiency and yield of finished products.

Description

Full-automatic punching riveting system and working process thereof

Technical Field

The invention relates to an in-mold riveting device, in particular to a full-automatic punching riveting system and a working process thereof.

Background

In the field of stamping, a stamped product and a rivet are often required to be riveted, a semi-finished product is stamped in the traditional production process, then the riveting of the stamped semi-finished product and the rivet is completed through secondary processing, and then subsequent processing procedures such as cutting, bending and the like are continued. In the prior art, an electric cylinder is used for driving cantilever feeding or robot feeding, a clamp is matched for grabbing and placing rivets, but a punch press can only wait when the cantilever and the mechanical arm enter and exit, the efficiency of the punch press is affected, and the punch press is opened slowly to move the equipment disadvantageously.

Disclosure of Invention

The invention aims at: the full-automatic punching and riveting system and the working process thereof are efficient, stable and simple in structure.

The technical scheme of the invention is as follows: a full-automatic punching and riveting system comprises a punch press, a die, a feeder, a finished product discharging conveyor belt, a rivet conveying device, a positioning ejection device and a control center; the punch press is an automatic punch press and is provided with an electronic cam; the die is a stamping progressive die and comprises an upper die and a lower die, wherein the upper die comprises a stripper plate, a stop plate, a clamping plate, an upper base plate, an upper die holder and a cushion block which are sequentially arranged from bottom to top; a certain gap exists between the stop plate and the clamping plate in an initial state;

The rivet conveying device comprises a vibration arrangement conveying mechanism and a plurality of rivet conveying pipelines; the vibration arrangement conveying mechanism is fixedly arranged at the side of the punch; the positioning ejection device consists of a plurality of pneumatic ejection guns fixedly arranged on the die; each pneumatic ejection gun is connected with the vibration arrangement conveying mechanism through a rivet conveying pipeline; each pneumatic ejection gun comprises a gun barrel, a sleeve and a clamping mechanism; the upper port of each gun barrel is communicated with a corresponding rivet conveying pipeline; each sleeve is fixed on the die, and the lower end of the gun barrel is sleeved in the sleeve and is coaxially arranged with the sleeve; the clamping mechanism is arranged in the gun barrel and used for clamping and loosening rivets; the clamping mechanism is connected with the clamping plate through an elastic device, and the clamping mechanism is triggered to loosen the rivet through the downward movement of the clamping plate relative to the stop plate;

the rivet is conveyed into a rivet conveying pipeline according to a specified program through a vibration arrangement conveying mechanism, the rivet conveying pipeline is closed, and the pneumatic control loop is used for providing blowing pressure, so that the rivet obtains a certain movement speed in the conveying process and is conveyed into a corresponding pneumatic ejection gun; the opening and closing of the pneumatic control loop is controlled by an electric controller connected with the electronic cam;

When the full-automatic punching and riveting system works, the material belt to be processed is conveyed into a die on the punch press by the feeder, after the riveting holes are punched on the punching progressive die, the corresponding rivets are conveyed into the corresponding riveting holes by the pneumatic ejection gun, riveting is completed by the punching force of the punch press, after all punching, riveting and bending processes are completed on the material belt, products are cut off and slide onto a finished product discharging conveying belt, and the finished product discharging conveying belt is conveyed out of the punch press.

In the above technical solution, the positioning ejection device may be disposed on the upper mold, or may be disposed in an overhead layer between the upper mold and the lower mold, and these two technical solutions are described below respectively:

as an optimal technical scheme, the positioning ejection device is arranged on the upper die; the pneumatic ejection guns are fixedly arranged in the stripper plate, the lower end face of each pneumatic ejection gun is level with the lower end face of the stripper plate, and the upper end of each pneumatic ejection gun penetrates through the stripper plate and the stop plate to enable the upper end of each pneumatic ejection gun to be connected with the clamping plate; the positioning ejection device moves up and down along with the upper die.

As an optimal technical scheme, the positioning ejection device is fixedly connected to the lower die through an ejection gun mounting mechanism; the height dimension of each laminate of the ejection gun mounting mechanism is the same as that of the upper die, and when the clamping plate in the upper die moves downwards relative to the stop plate, the laminate corresponding to the clamping plate in the ejection gun mounting mechanism also moves downwards to trigger the clamping mechanism to loosen the rivet.

The system is used for riveting rivets, is of a nail-shaped structure with a cover cap at the upper end, the diameter of the lower end head part of the rivet is slightly smaller than that of the cover cap at the upper end, and the working principle of the clamping mechanism is as follows: in the initial state, the head of the rivet can pass through and plays a role in guiding, but the position of the cap with larger diameter can be blocked; loosening the rivet when the clamping mechanism is acted by external force to enable the rivet to fall into a rivet hole of the material belt (the rivet is ejected into the rivet hole under the pressure of compressed air); the following describes the technical scheme of five preferred pneumatic ejection guns respectively:

as a preferable technical scheme, the gun barrel consists of a movable gun barrel and an extension gun barrel; the upper end of the movable gun barrel is fixedly connected with the extension gun barrel, and the top of the extension gun barrel is connected with the rivet conveying pipeline; the lower part of the movable gun barrel is provided with a clamp spring, and the clamp spring is arranged below the lower end surface of the sleeve and is used for limiting the limit position of the upward movement of the movable gun barrel; the clamping mechanism consists of a plurality of balls arranged on the tube ring of the movable gun tube; the movable gun barrel comprises a movable gun barrel body, wherein a plurality of through holes are formed in a pipe ring of the movable gun barrel body, the through holes are uniformly distributed on the pipe ring and are positioned on the same horizontal plane, and a ball is arranged in each through hole; the inner diameter of the annular ring formed by the balls is smaller than the diameter of the tail part of the rivet and larger than the diameter of the head part of the rivet; the diameter of the through hole is larger at the outer side and smaller at the inner side, and is smooth in transition, the pore diameter of the through hole is smaller than the diameter of the ball at the position close to the inner wall of the movable gun barrel, and the pore diameter of the through hole is larger than the diameter of the ball at the position close to the outer wall of the movable gun barrel; the middle lower part of the inner cavity of the sleeve is provided with an annular groove, and the upper part and the lower part of the annular groove are provided with slopes; the elastic device comprises an in-tube spring and an on-tube elastic piece; the lower end of the spring in the tube is fixedly connected with a step surface on the inner wall of the sleeve, and the upper end of the spring in the tube is fixedly connected with the lower end surface of the extension gun tube; the lower end of the elastic piece on the pipe is fixedly connected with a step surface on the outer wall of the extended gun barrel, and the upper end of the elastic piece on the pipe is fixedly connected with the clamping plate; the lower end of the sleeve is also connected with a rubber spring, which plays an auxiliary role in dynamic guiding of the rivet;

When the movable gun barrel is positioned at the initial position, the tail part of the rivet is clamped by an annular ring formed by a plurality of balls; when the clamping plate moves downwards relative to the stop plate, the clamping plate applies downward acting force to the elastic piece on the pipe, so that the extending gun barrel drives the movable gun barrel to move downwards, the plurality of balls roll into the grooves, the inner diameter of an annular ring formed by the plurality of balls is enlarged, and the tail part of the rivet is loosened to enable the rivet to fall into a corresponding riveting hole; when the external force disappears, under the action of the restoring force of the spring in the pipe, the movable gun barrel and the extension gun barrel move upwards until the clamp spring contacts the sleeve, the movable gun barrel reaches the initial position, during the period, the movable gun barrel returns to the initial position under the guidance of the slope of the annular groove by a plurality of balls, and the inner diameter of the annular ring formed by the plurality of balls is restored to the minimum state for clamping the next rivet.

As a preferable technical scheme, the gun barrel consists of a movable gun barrel and a gun barrel connecting sleeve; the movable gun barrel is coaxially sleeved in the gun barrel coupling sleeve and the sleeve and can move up and down in the sleeve; the middle part of the movable gun barrel is fixedly connected with the gun barrel connecting sleeve, and the top of the movable gun barrel is connected with the rivet conveying pipeline; the clamping mechanism consists of a plurality of clamping claws arranged on the pipe ring at the lower end of the sleeve; each claw is connected with the sleeve through a rotating shaft, and torsion springs are arranged on the rotating shafts; the lower end part of the movable gun barrel is uniformly provided with a plurality of claw grooves which are used as movable spaces of a plurality of claws; the elastic device comprises an in-tube spring and an on-tube elastic piece; the lower end of the spring in the tube is fixedly connected with a step surface on the outer wall of the sleeve, and the upper end of the spring in the tube is fixedly connected with the lower end of the gun tube coupling sleeve; the outer circle of the boss of the sleeve is in clearance fit with an inner hole at the lower end of the gun barrel connecting sleeve, so that the gun barrel connecting sleeve is guided; the lower end of the upper elastic piece of the pipe is fixedly connected with the upper end face of the extended gun barrel, and the upper end of the upper elastic piece of the pipe is fixedly connected with the clamping plate;

When the movable gun barrel is positioned at the initial position, the clamping claws are in a folding state under the elasticity of the torsion springs, and the tail parts of the rivets are clamped; when the clamping plate moves downwards relative to the stop plate, the clamping plate applies downward acting force to the elastic piece on the pipe, so that the gun barrel connecting sleeve drives the movable gun barrel to move downwards, the top of the jaw groove of the movable gun barrel pushes down the jaw to loosen the rivet, and the rivet falls into the corresponding riveting hole; when the external force disappears, under the action of the restoring force of the spring in the pipe, the gun barrel connecting sleeve drives the movable gun barrel to move upwards until the movable gun barrel returns to the initial position, and simultaneously, the plurality of clamping jaws return to the folding state under the action of the elastic force of the torsion spring and are used for clamping the next rivet.

As a preferable technical scheme, the gun barrel consists of a movable gun barrel and a gun barrel connecting sleeve; the movable gun barrel is coaxially sleeved in the gun barrel coupling sleeve and the sleeve and can move up and down in the sleeve; the middle part of the movable gun barrel is fixedly connected with the gun barrel connecting sleeve, and the top of the movable gun barrel is connected with the rivet conveying pipeline; the clamping mechanism consists of a plurality of sliding block clamping claws arranged on the pipe ring at the lower end of the sleeve; each slider claw is in sliding connection with the sleeve through a sliding rail and a small pressure spring; the jaws of the sliding blocks at the original positions are in a closed state under the action of the elasticity of the small pressure springs, and the inner diameter of a circular ring formed by closing the jaws is smaller than the tail of the rivet and larger than the head of the rivet, so that the jaws are used for clamping the rivet; the lower end part of the movable gun barrel is uniformly provided with a plurality of slide block grooves on the barrel wall, and the slide block grooves are used as movable spaces of a plurality of slide blocks; the top of the sliding block groove of the movable gun barrel and the inner side of the sliding block claw are provided with matched inclined planes; the elastic device comprises an in-tube spring and an on-tube elastic piece; the lower end of the spring in the tube is fixedly connected with a step surface on the outer wall of the sleeve, and the upper end of the spring in the tube is fixedly connected with the lower end of the gun tube coupling sleeve; the outer circle of the boss of the sleeve is in clearance fit with an inner hole at the lower end of the gun barrel connecting sleeve, so that the gun barrel connecting sleeve is guided; the lower end of the upper elastic piece of the pipe is fixedly connected with the upper end face of the extended gun barrel, and the upper end of the upper elastic piece of the pipe is fixedly connected with the clamping plate;

When the movable gun barrel is positioned at the initial position, the sliding block clamping jaws are in a folding state under the elasticity of the small pressure spring, and the tail part of the rivet is clamped; when the clamping plate moves downwards relative to the stop plate, the clamping plate applies downward acting force to the elastic piece on the pipe, so that the gun barrel connecting sleeve drives the movable gun barrel to move downwards, the inclined surface at the lower end of the movable gun barrel pushes the sliding block claw open, and the rivet falls into the corresponding riveting hole; when the external force disappears, under the action of the restoring force of the spring in the pipe, the gun barrel connecting sleeve drives the movable gun barrel to move upwards until the movable gun barrel returns to the initial position, and simultaneously, the sliding block clamping jaws return to the folding state under the action of the elastic force of the small pressure spring and are used for clamping the next rivet.

As the preferable technical scheme, the gun barrel is a fixed gun barrel fixedly sleeved in the sleeve, and the top of the gun barrel is connected with the rivet conveying pipeline; the clamping mechanism consists of a plurality of clamping claws arranged on the pipe ring at the lower end of the sleeve; each claw is connected with the sleeve through a rotating shaft, and torsion springs are arranged on the rotating shafts; the lower end part of the gun barrel is uniformly provided with a plurality of claw grooves which are used as movable spaces of a plurality of claws; a plurality of sharp top pieces are arranged in the sleeve and can move up and down in the sleeve; each sharp top piece is in a step shape with a big top and a small bottom, the lower part of each sharp top piece is arranged in a tube ring of the gun tube, and the upper part of each sharp top piece radially penetrates through the tube wall of the sleeve; the elastic device comprises an in-tube spring and an on-tube elastic piece; the lower end of the spring in the pipe is fixedly connected with a step surface on the outer wall of the sleeve, and the upper end of the spring in the pipe is fixedly connected with the lower end surface of the step on the upper part of the pointed piece; the lower end of the upper elastic piece of the pipe is fixedly connected with the upper end face of the upper step of the sharp top piece, and the upper end of the upper elastic piece of the pipe is fixedly connected with the clamping plate;

When each pointed top piece is positioned at the initial position, the plurality of clamping jaws are in a folding state under the elasticity of the torsion spring, and the tail part of the rivet is clamped; when the clamping plate moves downwards relative to the stop plate, the clamping plate applies downward acting force to the elastic piece on the pipe to enable each pointed piece to move downwards, and the lower end part of each pointed piece props up the claw to loosen the rivet to enable the rivet to fall into the corresponding riveting hole; when the external force disappears, under the action of the restoring force of the springs in the pipe, each pointed piece moves upwards until each pointed piece returns to the initial position, and simultaneously, the plurality of clamping claws return to the folding state under the action of the elasticity of the torsion springs and are used for clamping the next rivet.

As the preferable technical scheme, the gun barrel is a fixed gun barrel fixedly sleeved in the sleeve, and the top of the gun barrel is connected with the rivet conveying pipeline; the clamping mechanism consists of a plurality of sliding blocks symmetrically arranged in a pipe ring at the lower end of the sleeve; each sliding block is in sliding connection with the sleeve through a sliding rail and a small pressure spring; the sliding blocks at the original positions are in a folding state under the action of the elasticity of the small pressure springs, and the inner diameter of a circular ring formed by folding is smaller than the tail part of the rivet and larger than the head part of the rivet; inclined surfaces are arranged on the upper end surfaces of the horizontal two ends of each sliding block, and V-shaped grooves are formed by the inclined surfaces of two adjacent sliding blocks; the elastic device is an elastic piece on the pipe; a plurality of sharp top pieces are arranged in the sleeve and can move up and down in the sleeve; each sharp-top piece is T-shaped, the lower end part of each sharp-top piece is a V-shaped sharp corner, and the upper end part of each sharp-top piece is fixedly connected with the clamping plate through an upper elastic piece of the pipe;

When the rivet is at the initial position, the sliding blocks are in the folding state under the elasticity of the small pressure springs, and the rivet is clamped; when the clamping plate moves downwards relative to the stop plate, the clamping plate applies downward acting force to the elastic piece on the pipe to enable each pointed piece to move downwards, the V-shaped sharp corner at the lower end of each pointed piece pushes the sliding block open through the inclined plane to loosen the rivet, and the rivet falls into the corresponding riveting hole; when the external force disappears, the sliding blocks are folded under the action of the restoring force of the small pressure springs, the V-shaped grooves push the pointed pieces to move upwards until the initial position, and meanwhile, the sliding blocks are restored to the folding state and used for clamping the next rivet.

As a preferable technical scheme, the vibration arrangement conveying mechanism comprises a vibration disc, a linear vibration row and a movable shifting fork mechanism; a go gauge type detector is arranged in the vibration disc, and a no-go gauge type detector is arranged in the linear vibration row; firstly forming preliminary arrangement of rivets in the length direction on a vibration disc, carrying out bayonet sorting, removing the rivets which are not passed through a conventional detector as defective products, enabling the qualified rivets to enter a linear vibration row, removing the rivets which are passed through the conventional detector as defective products, and conveying the qualified rivets to a rivet conveying pipeline through a shifting fork mechanism; the lower die is internally provided with a needle-tip-shaped guide nail for guiding and correcting the rivet with the hole; and a probe is arranged in the riveting punch in the die.

The working process of the full-automatic stamping riveting system comprises the following steps:

first), preparation of work: placing rivets into a vibration arrangement conveying mechanism according to the specification; simultaneously, placing the material belt to be processed on a feeder;

second), punching: leveling raw materials on a feeder, conveying the raw materials into a die on a punch press according to a specified action program, punching riveting holes and other through holes for riveting on a stamping progressive die through a punching procedure of at least one step, and continuously conveying the material belt forwards by one step by the feeder;

third), rivet conveying: firstly, rivets are sent to a rivet conveying pipeline through a vibration arrangement conveying mechanism according to a specified program, the rivet conveying pipeline is closed, and air blowing pressure is provided through a pneumatic control loop, so that the rivets obtain a certain movement speed in the conveying process and are conveyed to a corresponding pneumatic ejection gun; secondly, the die is closed, the clamping plate moves downwards relative to the stop plate under the action of continuous downward force of the upper die holder, the clamping mechanism is triggered to loosen the rivet, and after the rivet falls into the riveting hole, the feeder continuously conveys the material belt forwards for one step distance;

fourth), riveting: riveting is completed by using the stamping force of a punch press, and after riveting, the material belt is continuously conveyed forwards by a step distance by a feeder;

Fifthly), bending and cutting, namely processing the material plate into a finished product after the bending process of at least one step distance, cutting off the finished product, sliding the finished product onto a finished product discharging conveyor belt, and sending the finished product out of the punch press;

in the third step, the rivet is conveyed by adopting air pressure sectional type pneumatic conveying; the conveying start section and the conveying ascending section adopt relatively high air pressure for conveying, the conveying descending section and the conveying end section close to the conveying end section adopt relatively low air pressure for conveying, and partial compressed air is separated from the pipeline in the middle of conveying, so that the functions of reducing the conveying air pressure of the section and adjusting the running speed of rivets are achieved; the compressed air separated from the conveying pipeline can be used for self-cleaning of the mould and the vibration disc and the conveying device, is an energy-saving method for comprehensively utilizing the compressed air, and is the residual air from pneumatic conveying and pneumatic ejection;

in the third step, the control center is connected with an action signal from an electronic cam of the punch press, connected with rivet position signals from various sensors on the die, and used for controlling the cooperation action of the parts, the punch press and the die by using a PLC, and the pneumatic ejection time is controlled until the rivet head contacts with the riveting hole on the material plate when the die is closed, the tail part of the rivet is released by the pneumatic ejection gun, and the rivet is ejected into the riveting hole under the pressure of compressed air.

The invention has the advantages that:

1. according to the full-automatic punching and riveting system, the rivet riveting process of a punched product is added into the full-automatic continuous punching die, rivets are ejected into the riveting holes through the rivet conveying device and the positioning ejection device, a mechanical arm in the prior art is replaced, the efficiency of a punching machine is not affected by the fact that the mechanical arm enters and exits, and the processing efficiency of the product is effectively improved;

2. the positioning ejection device can be arranged in the upper die or in an overhead layer above the lower die according to actual requirements; when the positioning ejection device is arranged on the upper die, the part where the positioning ejection device is arranged does not change greatly, compared with the traditional progressive die, of each layer plate structure of the part of the die, the design is easier, but the positioning ejection device is arranged in each layer plate structure, so that the observation is inconvenient; when the positioning ejection device is arranged in the overhead layer above the lower die, an operator can directly observe the positioning ejection device, the adjustment and maintenance are convenient, but the local structure of the die is greatly changed compared with the traditional continuous die at the position where the positioning ejection device is arranged, and a corresponding space is needed to be reserved at the local part of the upper die during design;

3. the invention provides five technical schemes for positioning the ejection gun, and a proper pneumatic ejection gun can be selected according to the model of an actual rivet or various pneumatic ejection guns with different structures can be selected according to actual requirements;

4. The positioning ejection gun has a simple structure and a small volume, and can be arranged in a mould, when a product needs a large number of rivets to be riveted, the positioning ejection gun is suitable for processing by the equipment, and the riveting speed is effectively improved;

5. each positioning ejection gun has positioning guiding function on rivets, can accurately eject the rivets into the riveting holes, effectively improves the riveting efficiency and the qualification rate of products, and reduces the damage phenomenon of equipment;

6. the positioning ejection gun is connected with a clamping plate in the die through an elastic device, and the downward movement of the clamping plate relative to the stop plate is used for triggering the ejection action of the positioning ejection gun, so that the positioning ejection gun belongs to mechanical control, is accurate in control and is not easy to damage;

7. the automatic detection and defective product separation of each station are automatically carried out, the corresponding inductive switch or sensor does not generate due signals in a set time according to actions carried out in an action sequence, an alarm signal is automatically sent out and stopped, an operator is stopped after removing faults, the equipment is in an automatic state after being recovered to be normal, the equipment is effectively prevented from being damaged, and the defective rate of products is reduced.

Drawings

The invention is further described below with reference to the accompanying drawings and examples:

FIG. 1 is a schematic diagram of the full-automatic punch riveting system of the present invention;

FIG. 2 is a cross-sectional view of a die of a first embodiment of the full-automatic punch riveting system of the present invention;

FIG. 3 is a cross-sectional view of a die of a second embodiment of the fully automated punch riveting system of the present invention;

FIG. 4 is a schematic view of the structure of a first embodiment of the pneumatic ejection gun of the present invention (with rivets being clamped);

FIG. 5 is a schematic view of the structure of a first embodiment of the pneumatic ejection gun of the present invention (with rivets loosened);

FIG. 6 is a schematic structural diagram of a second embodiment of a pneumatic ejection gun according to the present invention;

FIG. 7 is a schematic illustration of another embodiment of a pneumatic ejection gun according to the present invention;

FIG. 8 is a schematic diagram of a pneumatic ejection gun of the present invention with a nut added (when the rivet is clamped);

FIG. 9 is a schematic diagram of a pneumatic ejection gun of the present invention with a nut added (when the rivet is loosened);

FIG. 10 is a schematic structural view of a third embodiment of a pneumatic ejection gun according to the present invention;

FIG. 11 is a schematic structural view of a fourth embodiment of a pneumatic ejection gun according to the present invention;

FIG. 12 is a schematic view of a fifth embodiment of a pneumatic ejection gun according to the present invention;

FIG. 13 is a cross-sectional view taken along A-A of FIG. 12;

FIG. 14 is a B-B cross-sectional view of FIG. 12;

fig. 15 is a schematic view showing a partial structure of a caulking punch in a die according to the present invention.

Detailed Description

Embodiment one:

as shown in fig. 1 and 2, the full-automatic punching and riveting system comprises a punching machine 1, a die 2, a feeder, a finished product discharging conveyor belt, a rivet conveying device 3, a positioning ejection device 4 and a control center; the feeder is used for providing a smooth material for the stamping progressive die, and stably finishing feeding at a proper speed according to the stroke precision requirement and matching with the actions of the stamping press and the die; the control center is used for controlling the punch, the die, the rivet conveying, positioning and detecting device and the feeder to be coordinated and consistent in action connection, so that the whole riveting system in the automatic punching die can safely and efficiently run; the punch 1 is an automatic punch and is provided with an electronic cam; in fig. 2, the leftmost part of the die 2 is a punching module, and punching of the gap part of the material belt including the structural hole and the riveting hole is completed; the middle is a pneumatic ejection and riveting module of the rivet; the rightmost side is a bending and cutting module; the die 2 is a stamping progressive die and comprises an upper die 21 and a lower die 22, wherein the upper die 21 comprises a stripper plate, a stop plate 23, a clamping plate 24, an upper base plate, an upper die holder and a cushion block 25 which are sequentially arranged from bottom to top; a certain gap exists between the stop plate 23 and the clamping plate 24 in the initial state; the rivet conveying device 3 comprises a vibration arrangement conveying mechanism 5 and a plurality of rivet conveying pipelines 6; the vibration arrangement conveying mechanism 5 is fixedly arranged at the side of the punch 1; the positioning ejection device 4 consists of a plurality of pneumatic ejection guns 7 fixedly arranged on the die 2; the positioning ejection device 4 is arranged on the upper die 21; the pneumatic ejection guns 7 are fixedly arranged in the stripper plate, the lower end face of each pneumatic ejection gun is level with the lower end face of the stripper plate, and the upper end parts of the pneumatic ejection guns penetrate through the stripper plate and the stop plate 23 to enable the upper ends of the pneumatic ejection guns to be connected with the clamping plates 24; the positioning ejection device 4 moves up and down along with the upper die 21; each pneumatic ejection gun 7 is connected with the vibration arrangement conveying mechanism 5 through a rivet conveying pipeline 6; each pneumatic ejection gun 7 comprises a gun barrel 71, a sleeve 72 and a clamping mechanism; the upper port of each of said barrels 71 communicates with a respective one of the rivet delivery conduits 6; the lower end of the gun tube 71 is sleeved in the sleeve 72 and is coaxially arranged with the sleeve 72; the clamping mechanism is arranged in the gun barrel 71 and is used for clamping and loosening rivets; the clamping mechanism is connected with the clamping plate 24 through an elastic device, and the clamping mechanism is triggered to loosen rivets through the downward movement of the clamping plate 24 relative to the stop plate 23; the rivets are sent to the rivet conveying pipeline 6 through the vibration arrangement conveying mechanism 5 according to a specified program, the rivet conveying pipeline 6 is closed, and the air blowing pressure is provided through the pneumatic control loop, so that the rivets obtain a certain movement speed in the conveying process and are conveyed to the corresponding pneumatic ejection gun 7; the opening and closing of the pneumatic control loop is controlled by an electric controller connected with the electronic cam.

As will be further described in the above description, the height of the spacer 25 depends on the minimum turning radius of the rivet delivery pipe 6, and the space in which the spacer 25 is supported in the upper die is required to ensure the installation of several rivet delivery pipes 6.

The vibration arrangement conveying mechanism 5 comprises a vibration disc, a linear vibration row and a movable shifting fork mechanism; a go gauge type detector is arranged in the vibration disc, and a no-go gauge type detector is arranged in the linear vibration row; firstly forming preliminary arrangement of rivets in the length direction on a vibration disc, carrying out bayonet sorting, removing the rivets which are not passed through a conventional detector as defective products, enabling the qualified rivets to enter a linear vibration row, removing the rivets which are passed through the conventional detector as defective products, and conveying the qualified rivets to a rivet conveying pipeline through a shifting fork mechanism; the operator only needs to put the rivets into the vibration disc, and the arrangement and detection are automatically finished by the machine; the tolerance of the external dimension can be detected, the through and the stop of the diameter of the thread can be detected, and the depth of the thread can be detected at the same time so as to judge whether the tooth depth is in place or not; the surface of the nut is not damaged by detection, and threads are not damaged in the process of detecting the go gauge and the no-go gauge; the rivet reaches the rivet conveying pipeline 6 through the shifting fork mechanism, the rivet conveying pipeline 6 is a hose, the inlet and the outlet of the hose are respectively provided with a sensor, and a signal can be measured when the rivet passes through, so that the conveying time of the rivet is obtained; the outlet of the rivet conveying pipeline 6 is connected with a pneumatic ejection gun, and rivets enter the riveting holes of the material plate through the pneumatic ejection gun. After the rivet enters the riveting hole of the material plate, a sensor is arranged at the rivet feeding position of the lower die of the stamping die, the position of the rivet is detected to confirm that the rivet is in the riveting hole of the material plate and is in place, a sensor with an anti-vibration type cylinder is adopted to transmit a signal to a control center, the machine continues the next action to feed and rivet the material belt, otherwise, the machine stops in an alarm mode; if the rivet is provided with a hole in the middle, the upper end of the middle part of the sensor at the corresponding feeding position is provided with a needle-shaped guide nail 26, so that the space is saved, and the problem of guide reliability of the rivet with the threaded hole is solved.

As shown in fig. 15, a probe 11 is arranged in a riveting punch in the die 2, when the rivet performs the riveting process, the probe 11 in the riveting punch is pressed onto the rivet first, and then the upper die continues to move downwards to perform riveting, so that the rivet is ensured not to shake, and the yield of riveting is effectively improved; the surface of the shell of the probe 11 is anodized and insulated with the punch, and the insulation can be realized by using a ceramic punch, so that the design can be used for measuring whether rivets exist in the rivet hole or not by using the probe before riveting, and if the abnormality is found, the process is stopped in time.

The system takes a metal strip as a raw material, and in the embodiment, an aluminum plate is used, and other metal or alloy materials can be used; when the full-automatic punching and riveting system works, raw materials are leveled and sent into a die 2 on a punch 1 according to a specified action program, after a riveting hole is punched on a punching progressive die, corresponding rivets are sent into corresponding riveting holes by a pneumatic ejection gun 7, riveting is completed by using the punching force of the punch, after all punching, riveting and bending processes are completed on a material belt, products are cut off and slide onto a finished product discharging conveying belt, and the finished product discharging conveying belt is sent out of the punch.

In this embodiment, at the position where the positioning ejection device is installed, the laminate structure of the mold part is not changed much compared with the conventional progressive mold, and the design is easier, but the positioning ejection device 4 is installed in the laminate structure, so that the observation is inconvenient, and if the failure occurs, the failure is not easy to be found and immediately removed.

Embodiment two:

as shown in fig. 1 and 3, the positioning ejection device 4 is fixedly connected to the lower die 22 through an ejection gun mounting mechanism 41; the height dimension of each laminate of the ejection gun mounting mechanism 41 is the same as that of the upper die, and when the clamping plate 24 in the upper die 21 moves downwards relative to the stop plate 23, the laminate corresponding to the clamping plate 24 in the ejection gun mounting mechanism 41 also moves downwards to trigger the clamping mechanism to release the rivet. The rest of the structure is the same as in the first embodiment.

In this embodiment, the positioning ejection device 4 is arranged in the overhead layer above the lower die, the ejection gun mounting mechanism can be provided with an observation hole, so that the rivet can be observed conveniently, when a fault occurs, an operator can directly observe the positioning ejection device 4, so that even if the fault is detected, the maintenance is convenient, but at the position where the positioning ejection device is mounted, the local structure of the die has larger change compared with the traditional continuous die, and corresponding space is required to be reserved at the local part of the upper die during design.

The full-automatic punching riveting system is used for riveting rivets, is of a nail-shaped structure with a cover cap at the upper end, the diameter of the lower end head part of the rivet is slightly smaller than that of the cover cap at the upper end, and the working principle of the clamping mechanism is as follows: in the initial state, the head of the rivet can pass through and plays a role in guiding, but the position of the cap with larger diameter can be blocked; loosening the rivet when the clamping mechanism is acted by external force to enable the rivet to fall into the rivet hole; the pneumatic ejection guns in the two embodiments can be selected from one pneumatic ejection gun or various pneumatic ejection guns with different structures according to actual requirements, and the following five preferred technical schemes of the pneumatic ejection guns are respectively described:

Pneumatic ejection gun embodiment one: as shown in fig. 4 and 5, the barrel 71 is composed of a movable barrel 711 and an extension barrel 712; the upper end of the movable gun barrel 711 is fixedly connected with the extension gun barrel 712, and the top of the extension gun barrel 712 is connected with the rivet conveying pipeline 6; a clamping spring 713 is arranged at the lower part of the movable gun tube 711, and the clamping spring 713 is arranged below the lower end surface of the sleeve 72 and is used for limiting the limit position of the upward movement of the movable gun tube 711; the clamping mechanism consists of a plurality of balls 714 arranged on a tube ring of the movable gun tube 711; a plurality of through holes 715 are formed in the tube ring of the movable gun tube 711, the through holes 715 are uniformly distributed on the tube ring and are positioned on the same horizontal plane, and a ball 714 is arranged in each through hole 715; an annular ring formed by a plurality of balls 714, the inner diameter of which is smaller than the diameter of the tail of the rivet and larger than the diameter of the head of the rivet; the diameter of the through hole 715 is larger at the outer side and smaller at the inner side, and is in smooth transition, the diameter of the through hole is smaller than the diameter of the ball 714 at the position close to the inner wall of the movable gun barrel 711, and the diameter of the through hole is larger than the diameter of the ball 714 at the position close to the outer wall of the movable gun barrel 711; an annular groove 721 is formed in the middle and lower part of the inner cavity of the sleeve 72, and slopes are formed on the upper part and the lower part of the annular groove 721; the elastic means includes an in-tube spring 722 and an on-tube elastic member 723; the lower end of the in-tube spring 722 is fixedly connected with a step surface on the inner wall of the sleeve 72, and the upper end is fixedly connected with the lower end surface of the extension gun barrel 712; the lower end of the upper elastic member 723 is fixedly connected with a step surface on the outer wall of the extension barrel 712, and the upper end is fixedly connected with the clamping plate 24; the lower end of the sleeve 72 is also connected with a rubber spring 724 which plays an auxiliary role in dynamic guiding of the rivet; the diameter of the middle of the rubber spring 724 is slightly larger than the diameter of the head of the rivet, a chamfer is arranged at the upper part of the hole, so that the rivet head is conveniently led in, the middle of the rubber spring 724 is split, when the movable gun barrel moves downwards, the lower end of the gun barrel pushes the split hole in the middle of the rubber spring open, so that the tail of the rivet can conveniently pass, and the section of the chamfer is preferably in the shape of an involute in consideration of the stability of movement of the tail of the rivet when the tail of the rivet passes and the service life of the rubber spring, so that the section of the chamfer can be properly simplified; the rubber spring 724 can be made of wear-resistant rubber such as polyurethane, and can be combined with metal to form a part, the metal sheet similar to a reed is used, the center Kong Kaicha of the metal reed is supported by the metal reed, and the periphery is made of rubber material, so that the rubber spring has good elasticity, is wear-resistant and is convenient to install and fix; for the rivet with high requirement on the guiding precision, the rubber spring can play a key role in improving the guiding precision, and for the rivet with low requirement on the guiding precision, the rubber spring can not be arranged.

When the movable gun barrel 711 is positioned at the initial position, the tail of the rivet is clamped by an annular ring formed by a plurality of balls 714; when the clamping plate 24 moves downwards relative to the baffle plate 23, the clamping plate 24 applies downward force to the elastic element 723 on the pipe, so that the extending gun barrel 712 drives the movable gun barrel 711 to move downwards, the plurality of balls 714 roll into the grooves 721, the inner diameter of an annular ring formed by the plurality of balls 714 is enlarged, and the tail of the rivet is loosened to enable the rivet to fall into a corresponding riveting hole; when the external force is removed, the movable barrel 711 and the extension barrel 712 move upward under the restoring force of the in-tube spring 722 until the snap spring 713 contacts the sleeve 72, and the movable barrel 711 reaches the initial position, during which the inner diameter of the annular ring composed of the plurality of balls 714 is restored to the minimum state for catching the next rivet under the guidance of the slope of the annular groove 721 by the plurality of balls 714.

Even if the scheme is that one layer of balls is adopted, two or more layers of balls can be arranged according to the length requirement of the rivet, and the balls of each layer are positioned on the same horizontal plane; the balls of each layer are correspondingly provided with a layer of annular groove with a slope, the movement mode of the annular groove is similar to that of a single-layer ball, and the multi-layer ball structure is used for guiding assistance of a long rivet.

The movable gun barrel can also have an inner layer and an outer layer, the through holes 715 formed in the inner layer are slightly smaller, the through holes 715 corresponding to the outer layer are slightly larger, the two layers are convenient to process the through holes 715, and the inner layer and the outer layer are in interference fit to form the movable gun barrel.

Pneumatic ejection gun embodiment II: as shown in fig. 6, the barrel 71 is composed of a movable barrel 711 and a barrel coupling sleeve 716; the movable gun tube 711 is coaxially sleeved in the gun tube coupling sleeve 716 and the sleeve 72 and can move up and down in the sleeve 72; the middle part of the movable gun tube 711 is fixedly connected with a gun tube connecting sleeve 716, can be connected through threads, can also be connected through interference fit or welding and the like, and the top of the movable gun tube 711 is connected with a rivet conveying pipeline 6; the clamping mechanism consists of a plurality of clamping claws 717 arranged on the pipe ring at the lower end of the sleeve 72; each claw 717 is connected with the sleeve 72 through a rotating shaft, the lug holes on the claws are matched with the rotating shaft, and torsion springs are arranged on each rotating shaft and can be replaced by leaf springs or other springs; the lower end part of the movable gun barrel 711 is uniformly provided with a plurality of claw grooves on the barrel wall, and the claw grooves are used as movable spaces of a plurality of claws; the elastic means includes an in-tube spring 722 and an on-tube elastic member 723; the lower end of the in-tube spring 722 is fixedly connected with a step surface on the outer wall of the sleeve 72, and the upper end of the in-tube spring is fixedly connected with the lower end of the gun tube coupling sleeve 716; the boss outer circle of the sleeve 72 is in clearance fit with the inner hole at the lower end of the gun barrel connecting sleeve 716, so that the gun barrel connecting sleeve 716 is guided, and the gun barrel connecting sleeve is fixedly connected with the movable gun barrel, so that the guiding effect is also the guiding effect on the movable gun barrel; the lower end of the upper elastic member 723 is fixedly connected with the upper end surface of the extension barrel 712, and the upper end thereof is fixedly connected with the clamping plate 24;

When the movable gun barrel 711 is positioned at the initial position, the plurality of clamping claws 717 are in a closed state under the elasticity of the torsion spring, and the tail parts of the rivets are clamped; when the clamping plate 24 moves downwards relative to the stop plate 23, the clamping plate 24 applies downward acting force to the elastic element 723 on the pipe, so that the barrel connecting sleeve 716 drives the movable barrel 711 to move downwards, the top of the jaw groove of the movable barrel 711 pushes down the jaw 717 to loosen the rivet, and the rivet falls into the corresponding riveting hole; when the external force disappears, under the action of the restoring force of the in-pipe spring 722, the gun barrel connecting sleeve 716 drives the movable gun barrel 711 to move upwards until the movable gun barrel 711 returns to the initial position, and simultaneously, the plurality of clamping jaws 717 return to the closed state under the action of the elastic force of the torsion spring so as to clamp the next rivet.

As shown in fig. 8 and 9, a nut 728 with an inclined surface on the upper end surface is arranged at the lower end of the movable gun barrel 711, an inclined surface is also arranged at the lower end of the claw 717, and the inclined surface of the nut 728 is matched with the inclined surface at the lower end of the claw 717; the ramp engagement also serves to control the end point of the upward movement of the movable barrel 711; when the movable gun barrel is at the original position, the inclined surface of the lower end of the claw is buckled by the inclined surface of the nut, so that the claw is in a folded and locked state, when the movable gun barrel moves downwards, the inclined surface of the lower end of the claw is loosened by the inclined surface of the nut, and the claw is pushed by the pressure of the tail part of the rivet and is pushed by the downward tip of the movable gun barrel, so that the tail part of the rivet can pass through. With the inclined plane matching, the rotating shaft can be provided with no torsion spring, so that the structure beside the rotating shaft is simplified, and the rotating shaft is suitable for miniaturized design. The inclined plane of the nut can be arranged at the position which is in contact with the lower end of the claw, and the rest parts still keep the plane end face like the common nut; the vertical section of the inclined plane of the nut can be an inclined straight line, an inclined fold line or an inclined curve, and the nut can drive the clamping jaw to move and position stably; after the nut is assembled and adjusted in place, screw locking measures are required to ensure that the screw thread does not loosen during operation; the structural design of the nut with the inclined surface on the upper end surface can be connected to the lower end of the movable gun barrel in an interference fit or welding mode without threaded connection, and the limit can be realized by adopting a clamp spring. The nut 728 is designed to fit the inner hole of the lower part of the sleeve in a clearance fit manner, and the clearance fit plays a role in guiding the movable gun barrel, so that the center of the movable gun barrel and the center of the sleeve are coaxial when the movable gun barrel moves up and down. Thereby ensuring that the center of the rivet is aligned with the rivet hole.

It should be noted that the outer circle of the nut with the inclined plane is in clearance fit with the inner hole at the lower part of the sleeve, the outer circle of the boss of the sleeve is in clearance fit with the inner hole at the lower end of the barrel coupling sleeve, the two clearance fits can play a role in guiding, and one of the two clearance fits can be selected or the two clearance fits are used together according to actual needs; when the two parts are matched together, the two parts are ensured to be coaxial, otherwise, the phenomenon of inflexible movement and even jamming can occur.

Regarding the structure of the jaw 717, the structure can be designed into a rotating shaft jaw type shown in fig. 6, and also can be designed into a swing rod jaw shown in fig. 7, the upper part of the swing rod jaw 717 is pressed by a gun barrel coupling sleeve 716, so that the swing rod jaw is opened, and the swing rod jaw is reset, and the swing rod jaw is pressed by a pressure spring at the lower part of the swing rod jaw, so that the function of the swing rod jaw can be realized by a torsion spring or other springs.

Pneumatic ejection gun embodiment three: as shown in fig. 10, the barrel 71 is composed of a movable barrel 711 and a barrel coupling sleeve 716; the movable gun tube 711 is coaxially sleeved in the gun tube coupling sleeve 716 and the sleeve 72 and can move up and down in the sleeve 72; the middle part of the movable gun tube 711 is fixedly connected with a gun tube coupling sleeve 716, and the top of the movable gun tube 711 is connected with a rivet conveying pipeline 6; the clamping mechanism consists of a plurality of slide block claws 718 arranged on the pipe ring at the lower end of the sleeve 72; each slider jaw 718 is slidably connected to the sleeve 72 by a slide rail 725 and a small compression spring 726; the sliding rail 725 is formed on the pipe wall of the sleeve 72 from inside to outside and obliquely downwards, when the sliding block claw 718 receives downward thrust, the inclined sliding rail 725 has small resistance, and the clamping phenomenon is not easy to occur; the sliding block claws 718 at the original positions are in a closed state under the action of the elasticity of the small pressure springs 726, and the inner diameter of a closed circular ring is smaller than the tail of the rivet and larger than the head of the rivet so as to clamp the rivet; the lower end part of the movable gun barrel 711 is uniformly provided with a plurality of slide block grooves on the barrel wall, and the slide block grooves are used as movable spaces of a plurality of slide blocks; the top of the sliding block groove of the movable gun barrel 711 and the inner side of the sliding block claw 718 are provided with matched inclined planes; the elastic means includes an in-tube spring 722 and an on-tube elastic member 723; the lower end of the in-tube spring 722 is fixedly connected with a step surface on the outer wall of the sleeve 72, and the upper end of the in-tube spring is fixedly connected with the lower end of the gun tube coupling sleeve 716; the outer circle of the boss of the sleeve 72 is in clearance fit with the inner hole at the lower end of the gun barrel coupling sleeve 716, so that the gun barrel coupling sleeve 716 is guided; the lower end of the upper elastic member 723 is fixedly connected with the upper end surface of the extension barrel 712, and the upper end thereof is fixedly connected with the clamping plate 24;

When the movable gun barrel 711 is positioned at the initial position, the sliding block claws 718 are in a closed state under the elasticity of the small pressure springs 726, and the tail parts of the rivets are clamped; when the clamping plate 24 moves downwards relative to the stop plate 23, the clamping plate 24 applies downward acting force to the elastic element 723 on the pipe, so that the barrel connecting sleeve 716 drives the movable barrel 711 to move downwards, the inclined surface at the lower end of the movable barrel 711 pushes the sliding block claw 718 open, and the rivet falls into the corresponding riveting hole; when the external force disappears, under the action of the restoring force of the in-pipe spring 722, the gun barrel connecting sleeve 716 drives the movable gun barrel 711 to move upwards until the movable gun barrel 711 returns to the initial position, and simultaneously, the plurality of slide block claws 718 return to the folding state under the action of the elastic force of the small pressure spring 726 for clamping the next rivet.

Fourth embodiment of pneumatic ejection gun: as shown in fig. 11, the gun tube 71 is a fixed gun tube fixedly sleeved in the sleeve 72, and the top of the gun tube is connected with the rivet conveying pipeline 6; the clamping mechanism consists of a plurality of clamping claws 717 arranged on the pipe ring at the lower end of the sleeve 72; each claw 717 is connected with the sleeve 72 through a rotating shaft, and torsion springs are arranged on the rotating shafts; the lower end part of the gun barrel 71 is uniformly provided with a plurality of claw grooves which are used as movable spaces of a plurality of claws; the sleeve 72 is also provided with a plurality of sharp-top pieces 719 which can move up and down in the sleeve 72; each tip 719 is stepped with a large upper part and a small lower part, the lower part of each tip is arranged in a tube ring of the gun tube 71, and the upper part of each tip radially penetrates through the tube wall of the sleeve 72; the elastic means includes an in-tube spring 722 and an on-tube elastic member 723; the lower end of the in-tube spring 722 is fixedly connected with a step surface on the outer wall of the sleeve 72, and the upper end of the in-tube spring is fixedly connected with the lower end surface of the upper step of the sharp top piece 719; the lower end of the upper elastic member 723 is fixedly connected with the upper end surface of the upper step of the tip member 719, and the upper end thereof is fixedly connected with the clamping plate 24; when each pointed top piece 719 is positioned at the initial position, the plurality of clamping jaws 717 are in a closed state under the elasticity of the torsion spring, and the tail of the rivet is clamped; when the clamping plate 24 moves downward relative to the stop plate 23, the clamping plate 24 applies downward force to the pipe upper elastic member 723 to move each of the pointed members 719 downward, the lower end portion of each pointed member 719 pushes open the claw 717 to release the rivet, and the rivet falls into the corresponding riveting hole; when the external force is removed, each of the pointed members 719 moves upward under the restoring force of the in-tube spring 722 until each of the pointed members 719 returns to the original position, and at the same time, the plurality of jaws 717 return to the closed state under the elastic force of the torsion spring for catching the next rivet.

Fifth embodiment of pneumatic ejection gun: as shown in fig. 12-14, the gun tube 71 is a fixed gun tube fixedly sleeved in the sleeve 72, and the top of the gun tube is connected with the rivet conveying pipeline 6; the clamping mechanism consists of a plurality of sliding blocks 727 symmetrically arranged in a pipe ring at the lower end of the sleeve 72; each sliding block 727 is slidably connected with the sleeve 72 through a sliding rail 725 and a small pressure spring 726; the sliding blocks 727 at the original positions are in a folded state under the action of the elasticity of the small pressure springs 726, and the inner diameter of a circular ring formed by folding is smaller than that of the tail part of the rivet and larger than that of the head part of the rivet; the upper end surfaces of the horizontal two ends of each sliding block 727 are provided with inclined surfaces, and the inclined surfaces of two adjacent sliding blocks 727 form a V-shaped groove; the elastic means is an on-tube elastic member 723; the sleeve 72 is also provided with a plurality of sharp-top pieces 719 which can move up and down in the sleeve 72; each sharp-top piece 719 is T-shaped, the lower end of each sharp-top piece is a V-shaped sharp corner, and the upper end of each sharp-top piece is fixedly connected with the clamping plate 24 through a pipe upper elastic piece 723;

when in an initial position, the sliding blocks 727 are in a closed state by the elasticity of the small pressure springs 726, and the rivets are clamped; when the clamping plate 24 moves downwards relative to the stop plate 23, the clamping plate 24 applies downward force to the upper elastic element 723 of the pipe to enable each pointed element 719 to move downwards, the V-shaped sharp corner at the lower end of each pointed element 719 pushes up the sliding block 727 through the inclined plane to loosen the rivet, and the rivet falls into the corresponding riveting hole; when the external force is removed, the sliding blocks 727 are folded under the action of the restoring force of the small pressure springs 726, the V-shaped grooves push the pointed pieces 719 to move upwards until the initial position, and meanwhile the sliding blocks 727 are restored to the folded state for clamping the next rivet.

In the above technical solution, the upper ends of the plurality of pointed members 719 may also be connected together to form an integral part, and the upper ends thereof form a ring and are sleeved outside the gun tube 71; the structural design of the integral part can ensure the simultaneity of up-and-down movement and can lead the rivet ejection to be more stable.

The pneumatic ejection gun according to the above five embodiments, the pressure of the downward movement of the upper mold clamping plate of the mold is transmitted and limited by the elastic member 723 on the pipe, when the upper mold clamping plate is closed downward, the elastic member 723 on the pipe is pressed, then the pressure is continuously transmitted downward, when the clamping mechanism is in the maximum opening state, the elastic member 723 on the pipe is closed downward, so that the force is absorbed by the elastic member 723 on the pipe, and the pneumatic ejection gun is not crushed, and the elastic member 723 on the pipe can be a spring, such as fig. 4 and 5, or a combination of a plurality of springs, such as fig. 6, 7 and 10-13, for example, a plurality of elements similar to measuring probes are used, and the elements of the probes are evenly distributed. By means of the structural design, a time window can be reserved for opening and closing of the clamping mechanism and ejection of the rivet, after the clamping mechanism is opened, the rivet is ejected, and the stamping die is continuously folded to be completely closed and pressed, and then is opened; the clamping mechanism and rivet have sufficient time to complete the relevant action.

The pneumatic ejection gun according to the second embodiment to the fifth embodiment may be provided with two or more jaws, and is generally uniformly distributed, for example, three jaws are generally uniformly distributed at an angle of 120 degrees, four jaws are generally uniformly distributed at an angle of 90 degrees, five jaws are generally uniformly distributed at an angle of 72 degrees, and six jaws are generally uniformly distributed at an angle of 60 degrees; for the sliding block clamping jaw, the even clamping jaw structure is more stable; in addition, the sharp-tipped member for jacking the slider claws also needs to be increased and adjusted accordingly according to the distribution of the slider claws. The lower part of the claw or the lower part of the claw of the sliding block can also adopt structures such as a roller micro bearing roller or a ball, and the like at the lower end surface of the claw of the sliding block changes the friction form between the claw of the sliding block and the workpiece of the material belt from sliding friction to rolling friction so as to reduce the friction force between the claw of the sliding block and the workpiece of the material belt when the claw of the sliding block moves and reduce the thrust force required by the claw of the sliding block; the inner side surface of the claw or the sliding block claw can be also provided with a roller or a ball and other structures, so that the friction mode between the rivet and the side wall of the claw is changed from sliding friction to rolling friction when the rivet moves downwards, the friction force between the rivet and the side wall of the sliding block claw when the rivet moves downwards is reduced, and meanwhile the abrasion of the sliding block claw is reduced.

The working process of the full-automatic punching and riveting system comprises the following steps:

1. work preparation: placing rivets into a vibration arrangement conveying mechanism 5 according to the specification; simultaneously, placing the material belt to be processed on a feeder;

2. punching: leveling raw materials on a feeder, conveying the raw materials into a die on a punch press according to a specified action program, arranging one or more steps on a stamping progressive die according to the number and arrangement of actual product holes to finish a punching process, and continuously conveying the material belt forwards by one step by the feeder after punching riveting holes and other through holes for riveting;

3. rivet conveying: firstly, rivets are sent into a rivet conveying pipeline 6 through a vibration arrangement conveying mechanism 5 according to a specified program, the rivet conveying pipeline 6 is closed, and blowing pressure is provided through a pneumatic control loop, so that the rivets obtain a certain movement speed in the conveying process and are conveyed into a corresponding pneumatic ejection gun 7; secondly, the die is closed, the clamping plate 24 moves downwards relative to the stop plate 23 under the action of continuous downward force of the upper die holder, the clamping mechanism is triggered to loosen rivets, and after the rivets fall into the riveting holes, the feeder continuously conveys the material belt forwards for one step distance;

4. Riveting: riveting is completed by using the stamping force of a punch press, and after riveting, the material belt is continuously conveyed forwards by a step distance by a feeder;

5. bending and cutting, namely arranging one or more steps according to the bending requirement of an actual product to finish the bending process, cutting off a finished product, sliding the finished product onto a finished product discharging conveying belt, and sending the finished product out of a punch press;

the rivet is conveyed in the third step by adopting air pressure sectional type pneumatic conveying; the conveying start section and the conveying ascending section adopt relatively high air pressure for conveying, the conveying descending section and the conveying end section close to the conveying end section adopt relatively low air pressure for conveying, and partial compressed air is separated from the pipeline in the middle of conveying, so that the functions of reducing the conveying air pressure of the section and adjusting the running speed of rivets are achieved; the compressed air separated from the conveying pipeline can be used for self-cleaning of the mould and the vibration disc and the conveying device, is an energy-saving method for comprehensively utilizing the compressed air, and is the residual air from pneumatic conveying and pneumatic ejection; the pneumatic transmission adopts a compressed air pressure regulating valve, a reversing valve, a pressure relief valve, a filter, a pressure relief separation component, a pipeline, a control unit and the like to form a local pneumatic loop, and the local air pressure of the loop is regulated and controlled according to the beat requirement of rivet transmission so as to achieve the optimal transmission effect; regarding the comprehensive utilization of the compressed air, the scheme of the comprehensive utilization is considered according to the different pressure of the residual compressed air, if the pressure of the partial compressed air separated from the pipeline in the middle of conveying is higher, the partial compressed air can be firstly connected to a vacuum generator for generating vacuum and used for places needing to suck the waste, for example: a vacuum pipeline is connected to a lower waste port of the stamping die and used for cleaning waste and dust at the lower waste port and the periphery of the lower waste port; the comprehensive utilization of the compressed air with lower pressure can be realized, an air blowing port is designed at the places where the waste scraps and dust are easy to collect, of the mold and the vibration disk, and the compressed air with lower pressure is connected with the residual air for blowing and cleaning; cleaning scraps and dust on the die, the material belt and the vibration disc through a cleaning measure of blowing-sucking combination; in addition, the design of the separating component of partial compressed air separated from the pipeline in the middle of rivet conveying can design the compressed air separating component to have a dust removing function, so that the self-cleaning effect on the conveying pipeline is achieved, the rivet is simultaneously removed with dust in the conveying process, the cleanliness of the product can be improved, and the system can be operated more stably;

In the third step, the control center accesses the action signal from the electronic cam of the punch press, accesses the rivet position signal from each sensor on the die, and controls the above components to cooperate with the punch press and the die by using the PLC, and the optimal state is as follows: and controlling the pneumatic ejection time until the rivet head just contacts the riveting hole on the aluminum plate during die assembly, and just releasing the tooth-shaped protruding structure at the tail part of the rivet by the ejection mechanism to start ejection.

When the rivet reaches the upper part of the pneumatic ejection gun through pneumatic conveying, a blocking piece can be additionally arranged above the pneumatic ejection gun, the rivet is blocked from going forward, the time required by the rivet to descend from the blocking piece to the balls or the clamping jaws of the pneumatic ejection gun is calculated according to the running beat of the punch press and the time required by the clearance between the upper die clamping plate and the stop plate of the stamping die to be closed, the time required by the blocking piece to be opened is calculated, the time required by the pneumatic ejection is controlled to be when the rivet head just contacts the riveting hole on the aluminum plate during die assembly, and the tooth-shaped protruding structure at the tail part of the rivet is just released by the ejection mechanism to start ejection. The blocking piece can be driven by an electromagnet, a small cylinder, and a mechanical structure when the rivet reaches a proper position of the upper die of the stamping die through the pressing down action of the upper die of the stamping die. The scheme that has the barrier above the pneumatic ejection rifle, can be more accurate control good ejection time, but its shortcoming is that this local structure has again complicacy, and this scheme is the further research direction in the technique of this application, because this structural principle is fairly simple, therefore does not draw the structure schematic diagram in detail in this application.

The control center is an electrical control system, the rivet can be automatically analyzed through monitoring and detecting the rivet at each position and editing the program, so that the optimal starting time of rivet conveying is obtained, and the process parameter can be automatically formed in a full-automatic state; the programs of the control center are divided into a single-action control program, a stepwise control program, a linkage control program, an automatic calculation linkage control program and the like; the main action sequence in the control program is as follows:

the starting conditions for the "vibrating" action of the vibrating disk are: the straight line section is not enough, and the action after reaching the starting condition is to automatically start vibration; the action ending condition is that the straight line section is full, and when the action ending condition is reached, the vibration is automatically stopped;

the starting conditions of the blanking action of the linear vibration section are as follows: the electronic cam of the punch press gives out a starting signal that the electronic cam of the signal is rotated to a set angle or an automatically calculated angle after the ejection is finished or the equipment is started last time, the end part of the straight line section is provided with a material, and the action after reaching the starting condition is that a moving shifting fork block with rivets is moved to a discharging pipe orifice; the action finishing condition is that an inductive switch below the blanking pipe orifice senses that the rivet passes through, and when the finishing condition is reached, the empty rivet moves the shifting fork block to move back to the end part of the straight line segment;

The starting conditions of the pneumatic ejection gun for rivet ejection are as follows: the inductive switch at the top of the pneumatic ejection gun senses that the rivet arrives, receives a start signal of the pneumatic ejection, and after the start signal is received, the action is to blow the pneumatic ejection gun barrel, the action is consistent with the triggering of the upper die clamping plate of the stamping die on the pneumatic ejection gun so as to realize the rivet ejection, and the action ending condition is that the lower die sensor senses that the rivet arrives in place, and when the ending condition is reached, the blowing of the pneumatic ejection gun barrel is stopped. For the scheme of adding the blocking piece above the pneumatic ejection gun, the time for opening the blocking piece is controlled, and the action of blowing the pneumatic ejection gun barrel and the action of opening the blocking piece are performed simultaneously.

Regarding the automatic calculation of parameters, a simple example will be described, for example: the starting operation parameters of rivet conveying can be automatically adjusted on the basis of automatically detected test data, an interface for adjusting the starting time of rivet conveying is arranged on an operation interface of a control center, the interface for adjusting the starting time of rivet conveying is opened, the automatic state is entered, the test data reaching the specified test times are automatically calculated, the calculated data are automatically used as operation parameter test operation verification, if the arrival time of rivet conveying is reflected in the feedback information of each sensor to be 0.1 second earlier than the standard (the values of multiple test operations are assumed to be about 0.1 second earlier than the standard and in a very close range), under the automatic state, the rivet conveying starting time is automatically delayed by 0.1 second, and after the automatically adjusted parameter is verified to reach the standard through the specified operation times, the verified and confirmed parameter is automatically stored as the formal operation parameter of the next stage. Of course, the actual problems may not be as simple, and there is a relatively complex functional relationship between the associated parameters, and a corresponding function needs to be established in the program, so as to automatically calculate the required operating parameters, and thus the designed program can be automatically adjusted to the optimal ejection state, that is: the pneumatic ejection time is controlled until the rivet head just contacts the riveting hole on the material plate when the stamping die is clamped, and the tooth-shaped protruding structure (also called as a cap structure) at the tail part of the rivet is just released by the ejection mechanism to start ejection. Other parameter automatic calculations are similar and will not be described in detail herein.

The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations which can be accomplished by persons skilled in the art without departing from the spirit and technical spirit of the present invention shall be covered by the appended claims.

Claims

1. The utility model provides a full-automatic punching press riveting system, includes punch press (1), mould (2), feeder and finished product ejection of compact conveyer belt, its characterized in that: the device also comprises a rivet conveying device (3), a positioning ejection device (4) and a control center; the punch (1) is an automatic punch and is provided with an electronic cam; the die (2) is a stamping progressive die and comprises an upper die (21) and a lower die (22), wherein the upper die (21) comprises a stripper plate, a stop plate (23), a clamping plate (24), an upper base plate, an upper die holder and a cushion block (25) which are sequentially arranged from bottom to top; a certain gap exists between the stop plate (23) and the clamping plate (24) in an initial state;

the rivet conveying device (3) comprises a vibration arrangement conveying mechanism (5) and a plurality of rivet conveying pipelines (6); the vibration arrangement conveying mechanism (5) is fixedly arranged at the side of the punch (1); the positioning ejection device (4) consists of a plurality of pneumatic ejection guns (7) fixedly arranged on the die (2); each pneumatic ejection gun (7) is connected with the vibration arrangement conveying mechanism (5) through a rivet conveying pipeline (6); each pneumatic ejection gun (7) comprises a gun barrel (71), a sleeve (72) and a clamping mechanism; the upper port of each gun barrel (71) is communicated with a corresponding rivet conveying pipeline (6); each sleeve (72) is fixed on the die (2), and the lower end of the gun barrel (71) is sleeved in the sleeve (72) and is coaxially arranged with the sleeve (72); the clamping mechanism is arranged in the gun barrel (71) and is used for clamping and loosening rivets; the clamping mechanism is connected with the clamping plate (24) through an elastic device, and the clamping mechanism is triggered to loosen rivets through the downward movement of the clamping plate (24) relative to the stop plate (23);

The rivets are conveyed into a rivet conveying pipeline (6) through a vibration arrangement conveying mechanism (5) according to a specified program, the rivet conveying pipeline (6) is closed, and blowing pressure is provided through a pneumatic control loop, so that the rivets obtain a certain movement speed in the conveying process and are conveyed into a corresponding pneumatic ejection gun (7); the opening and closing of the pneumatic control loop is controlled by an electric controller connected with the electronic cam;

when the full-automatic punching and riveting system works, the feeder sends a material belt to be processed into a die (2) on the punch press (1), after a riveting hole is punched on a punching progressive die, the corresponding rivet is sent into a corresponding riveting hole by using a pneumatic ejection gun (7), riveting is completed by using the punching force of the punch press, after all punching, riveting and bending processes are completed on the material belt, a product is cut off and slides onto a finished product discharging conveying belt to be sent out of the punch press.

2. A full-automatic punch riveting system as claimed in claim 1 wherein: the positioning ejection device (4) is arranged on the upper die (21); the pneumatic ejection guns (7) are fixedly arranged in the stripper plate, the lower end face of each pneumatic ejection gun is level with the lower end face of the stripper plate, and the upper end parts of the pneumatic ejection guns penetrate through the stripper plate and the stop plate (23) to enable the upper ends of the pneumatic ejection guns to be connected with the clamping plates (24); the positioning ejection device (4) moves up and down along with the upper die (21).

3. A full-automatic punch riveting system as claimed in claim 1 wherein: the positioning ejection device (4) is fixedly connected to the lower die (22) through an ejection gun mounting mechanism (41); the height dimension of each laminate of the ejection gun mounting mechanism (41) is the same as that of the upper die, and when the clamping plate (24) in the upper die (21) moves downwards relative to the stop plate (23), the laminate corresponding to the clamping plate (24) in the ejection gun mounting mechanism (41) also moves downwards to trigger the clamping mechanism to release rivets.

4. A full-automatic punch riveting system as claimed in claim 1 wherein: the gun barrel (71) consists of a movable gun barrel (711) and an extension gun barrel (712); the upper end of the movable gun barrel (711) is fixedly connected with the extension gun barrel (712), and the top of the extension gun barrel (712) is connected with the rivet conveying pipeline (6); a clamp spring (713) is arranged at the lower part of the movable gun barrel (711), and the clamp spring (713) is arranged below the lower end surface of the sleeve (72) and is used for limiting the limit position of the upward movement of the movable gun barrel (711); the clamping mechanism consists of a plurality of balls (714) arranged on a tube ring of the movable gun tube (711); a plurality of through holes (715) are formed in the pipe ring of the movable gun barrel (711), the through holes (715) are uniformly distributed on the pipe ring and are positioned on the same horizontal plane, and a ball (714) is arranged in each through hole (715); an annular ring formed by a plurality of balls (714) with an inner diameter smaller than the diameter of the tail of the rivet and larger than the diameter of the head of the rivet; the diameter of the through hole (715) is larger at the outer side and smaller at the inner side, and is in smooth transition, the pore diameter of the through hole is smaller than the diameter of the ball (714) at the position close to the inner wall of the movable gun barrel (711), and the pore diameter of the through hole is larger than the diameter of the ball (714) at the position close to the outer wall of the movable gun barrel (711); an annular groove (721) is formed in the middle lower portion of the inner cavity of the sleeve (72), and slopes are formed in the upper portion and the lower portion of the annular groove (721); the elastic device comprises an in-tube spring (722) and an on-tube elastic member (723); the lower end of the spring (722) in the tube is fixedly connected with a step surface on the inner wall of the sleeve (72), and the upper end of the spring is fixedly connected with the lower end surface of the extension gun tube (712); the lower end of the upper elastic piece (723) of the tube is fixedly connected with a step surface on the outer wall of the extension gun tube (712), and the upper end is fixedly connected with the clamping plate (24); the lower end of the sleeve (72) is also connected with a rubber spring (724) which plays an auxiliary role in dynamic guiding of the rivet;

When the movable gun barrel (711) is positioned at the initial position, the tail part of the rivet is clamped by an annular ring formed by a plurality of balls (714); when the clamping plate (24) moves downwards relative to the baffle plate (23), the clamping plate (24) applies downward acting force to the elastic piece (723) on the pipe, so that the extending gun pipe (712) drives the movable gun pipe (711) to move downwards, the plurality of balls (714) roll into the grooves (721), the inner diameter of an annular ring formed by the plurality of balls (714) is enlarged, and the tail part of the rivet is loosened to enable the rivet to fall into a corresponding riveting hole; when the external force disappears, under the action of the restoring force of the spring (722) in the pipe, the movable gun tube (711) and the extension gun tube (712) move upwards until the clamp spring (713) contacts the sleeve (72), the movable gun tube (711) reaches the initial position, during the period, the movable gun tube (711) returns to the initial position under the guidance of the slope of the annular groove (721), and the inner diameter of the annular ring formed by the plurality of balls (714) is restored to the minimum state for clamping the next rivet.

5. A full-automatic punch riveting system as claimed in claim 1 wherein: the gun tube (71) consists of a movable gun tube (711) and a gun tube coupling sleeve (716); the movable gun tube (711) is coaxially sleeved in the gun tube coupling sleeve (716) and the sleeve (72) and can move up and down in the sleeve (72); the middle part of the movable gun barrel (711) is fixedly connected with a gun barrel connecting sleeve (716), and the top of the movable gun barrel is connected with a rivet conveying pipeline (6); the clamping mechanism consists of a plurality of clamping claws (717) arranged on the pipe ring at the lower end of the sleeve (72); each claw (717) is connected with the sleeve (72) through a rotating shaft, and torsion springs are arranged on the rotating shafts; the lower end part of the movable gun barrel (711) is uniformly provided with a plurality of claw grooves on the barrel wall, and the claw grooves are used as movable spaces of a plurality of claws; the elastic device comprises an in-tube spring (722) and an on-tube elastic member (723); the lower end of the spring (722) in the tube is fixedly connected with a step surface on the outer wall of the sleeve (72), and the upper end of the spring is fixedly connected with the lower end of the gun tube coupling sleeve (716); the outer circle of the boss of the sleeve (72) is in clearance fit with the inner hole at the lower end of the gun barrel coupling sleeve (716), so that the gun barrel coupling sleeve (716) is guided; the lower end of the upper elastic piece (723) of the tube is fixedly connected with the upper end face of the extension gun tube (712), and the upper end of the upper elastic piece is fixedly connected with the clamping plate (24);

When the movable gun barrel (711) is positioned at the initial position, the clamping claws (717) are in a folding state under the elasticity of the torsion springs, and the tail parts of the rivets are clamped; when the clamping plate (24) moves downwards relative to the baffle plate (23), the clamping plate (24) applies downward acting force to the elastic piece (723) on the pipe, so that the barrel connecting sleeve (716) drives the movable barrel (711) to move downwards, the top of the jaw groove of the movable barrel (711) pushes down the jaw (717) to loosen the rivet, and the rivet falls into the corresponding riveting hole; when the external force disappears, under the action of the restoring force of the spring (722) in the pipe, the gun barrel connecting sleeve (716) drives the movable gun barrel (711) to move upwards until the movable gun barrel (711) returns to the initial position, and simultaneously, the plurality of clamping claws (717) return to the folding state under the action of the elastic force of the torsion spring so as to clamp the next rivet.

6. A full-automatic punch riveting system as claimed in claim 1 wherein: the gun tube (71) consists of a movable gun tube (711) and a gun tube coupling sleeve (716); the movable gun tube (711) is coaxially sleeved in the gun tube coupling sleeve (716) and the sleeve (72) and can move up and down in the sleeve (72); the middle part of the movable gun barrel (711) is fixedly connected with a gun barrel connecting sleeve (716), and the top of the movable gun barrel is connected with a rivet conveying pipeline (6); the clamping mechanism consists of a plurality of sliding block clamping claws (718) arranged on a pipe ring at the lower end of the sleeve (72); each slide block claw (718) is slidably connected with the sleeve (72) through a slide rail (725) and a small pressure spring (726); the jaws (718) of the sliding blocks at the original positions are in a closed state under the action of the elasticity of the small pressure springs (726), and the inner diameter of a circular ring formed by closing the jaws is smaller than that of the tail part of the rivet and larger than that of the head part of the rivet, so that the jaws are used for clamping the rivet; the lower end part of the movable gun barrel (711) is uniformly provided with a plurality of slide block grooves on the barrel wall, and the slide block grooves are used as movable spaces of a plurality of slide blocks; the top of the sliding block groove of the movable gun barrel (711) and the inner side of the sliding block claw (718) are provided with matched inclined planes; the elastic device comprises an in-tube spring (722) and an on-tube elastic member (723); the lower end of the spring (722) in the tube is fixedly connected with a step surface on the outer wall of the sleeve (72), and the upper end of the spring is fixedly connected with the lower end of the gun tube coupling sleeve (716); the outer circle of the boss of the sleeve (72) is in clearance fit with the inner hole at the lower end of the gun barrel coupling sleeve (716), so that the gun barrel coupling sleeve (716) is guided; the lower end of the upper elastic piece (723) of the tube is fixedly connected with the upper end face of the extension gun tube (712), and the upper end of the upper elastic piece is fixedly connected with the clamping plate (24);

When the movable gun barrel (711) is positioned at the initial position, the elastic force of the small pressure springs (726) of the sliding block clamping claws (718) is in a folding state, and the tail parts of the rivets are clamped; when the clamping plate (24) moves downwards relative to the baffle plate (23), the clamping plate (24) applies downward acting force to the elastic piece (723) on the pipe, so that the barrel connecting sleeve (716) drives the movable barrel (711) to move downwards, the inclined surface at the lower end of the movable barrel (711) pushes the sliding block clamping jaw (718) open, and the rivet falls into the corresponding riveting hole; when the external force disappears, under the action of the restoring force of the spring (722) in the pipe, the gun barrel connecting sleeve (716) drives the movable gun barrel (711) to move upwards until the movable gun barrel (711) returns to the initial position, and simultaneously, the sliding block clamping claws (718) return to the folding state under the action of the elastic force of the small pressure spring (726) for clamping the next rivet.

7. A full-automatic punch riveting system as claimed in claim 1 wherein: the gun barrel (71) is a fixed gun barrel fixedly sleeved in the sleeve (72), and the top of the gun barrel is connected with the rivet conveying pipeline (6); the clamping mechanism consists of a plurality of clamping claws (717) arranged on the pipe ring at the lower end of the sleeve (72); each claw (717) is connected with the sleeve (72) through a rotating shaft, and torsion springs are arranged on the rotating shafts; the lower end part of the gun barrel (71) is uniformly provided with a plurality of claw grooves on the barrel wall, and the claw grooves are used as movable spaces of a plurality of claws; a plurality of sharp top pieces (719) are arranged in the sleeve (72) and can move up and down in the sleeve (72); each sharp top piece (719) is in a step shape with a large upper part and a small lower part, the lower part of each sharp top piece is arranged in a tube ring of the gun tube (71), and the upper part of each sharp top piece radially penetrates through the tube wall of the sleeve (72); the elastic device comprises an in-tube spring (722) and an on-tube elastic member (723); the lower end of the spring (722) in the pipe is fixedly connected with a step surface on the outer wall of the sleeve (72), and the upper end of the spring is fixedly connected with the lower end surface of the step at the upper part of the sharp top piece (719); the lower end of the upper elastic piece (723) of the pipe is fixedly connected with the upper end face of the upper step of the tip piece (719), and the upper end of the upper elastic piece is fixedly connected with the clamping plate (24);

When each pointed top piece (719) is positioned at the initial position, the plurality of clamping jaws (717) are in a closed state under the elasticity of the torsion spring, and the tail of the rivet is clamped; when the clamping plate (24) moves downwards relative to the baffle plate (23), the clamping plate (24) applies downward acting force to the elastic piece (723) on the pipe to enable each pointed piece (719) to move downwards, the lower end part of each pointed piece (719) pushes open the claw (717) to loosen the rivet, and the rivet falls into the corresponding riveting hole; when the external force is eliminated, under the action of the restoring force of the springs (722) in the pipe, each pointed piece (719) moves upwards until each pointed piece (719) returns to the initial position, and simultaneously, the plurality of clamping jaws (717) return to the folding state under the action of the elasticity of the torsion springs so as to clamp the next rivet.

8. A full-automatic punch riveting system as claimed in claim 1 wherein: the gun barrel (71) is a fixed gun barrel fixedly sleeved in the sleeve (72), and the top of the gun barrel is connected with the rivet conveying pipeline (6); the clamping mechanism consists of a plurality of sliding blocks (727) symmetrically arranged in a pipe ring at the lower end of the sleeve (72); each sliding block (727) is in sliding connection with the sleeve (72) through a sliding rail (725) and a small pressure spring (726); the sliding blocks (727) at the original positions are in a folding state under the action of the elasticity of the small pressure springs (726), and the inner diameter of a circular ring formed by folding is smaller than that of the tail part of the rivet and larger than that of the head part of the rivet; inclined surfaces are arranged on the upper end surfaces of the horizontal two ends of each sliding block (727), and V-shaped grooves are formed on the inclined surfaces of two adjacent sliding blocks (727); the elastic means is an on-tube elastic member (723); a plurality of sharp top pieces (719) are arranged in the sleeve (72) and can move up and down in the sleeve (72); each sharp top piece (719) is in a T shape, the lower end part of each sharp top piece is in a V-shaped sharp angle, and the upper end part of each sharp top piece is fixedly connected with the clamping plate (24) through the upper elastic piece (723) of the pipe;

When in an initial position, the sliding blocks (727) are in a closed state under the elasticity of the small pressure springs (726), and the rivets are clamped; when the clamping plate (24) moves downwards relative to the stop plate (23), the clamping plate (24) applies downward acting force to the elastic piece (723) on the pipe to enable each pointed piece (719) to move downwards, and the V-shaped sharp angle at the lower end of each pointed piece (719) pushes up the sliding block (727) through the inclined plane to loosen the rivet, so that the rivet falls into the corresponding riveting hole; when the external force disappears, the sliding blocks (727) are folded under the action of the restoring force of the small pressure springs (726), the V-shaped grooves push the pointed top pieces (719) to move upwards until the initial position, and meanwhile the sliding blocks (727) are restored to the folding state and used for clamping the next rivet.

9. A full-automatic punch riveting system according to any one of claims 1-8 wherein: the vibration arrangement conveying mechanism (5) comprises a vibration disc, a linear vibration row and a movable shifting fork mechanism; a go gauge type detector is arranged in the vibration disc, and a no-go gauge type detector is arranged in the linear vibration row; firstly forming preliminary arrangement of rivets in the length direction on a vibration disc, carrying out bayonet sorting, removing the rivets which are not passed through a conventional detector as defective products, enabling the qualified rivets to enter a linear vibration row, removing the rivets which are passed through the conventional detector as defective products, and conveying the qualified rivets to a rivet conveying pipeline through a shifting fork mechanism;

A pointed guide nail (26) is arranged in the lower die (22) and is used for guiding the rivet with the hole;

a probe (11) is arranged in the riveting punch in the die (2);

the inlet and the outlet of the rivet conveying pipeline (6) are both provided with sensors.

10. A process for operating a fully automated punch riveting system as claimed in claim 9 wherein: the method comprises the following steps:

first), preparation of work: placing rivets into a vibration arrangement conveying mechanism (5) according to the specification; simultaneously, placing the material belt to be processed on a feeder;

third), rivet conveying: firstly, rivets are conveyed into a rivet conveying pipeline (6) through a vibration arrangement conveying mechanism (5) according to a specified program, the rivet conveying pipeline (6) is closed, and blowing pressure is provided through a pneumatic control loop, so that the rivets obtain a certain movement speed in the conveying process and are conveyed into a corresponding pneumatic ejection gun (7); secondly, the die is clamped, the clamping plate (24) moves downwards relative to the stop plate (23) under the action of continuous downward force of the upper die holder, the clamping mechanism is triggered to loosen rivets, and after the rivets fall into the riveting holes, the feeding machine continuously conveys the material belt forwards for one step distance;

in the third step, the rivet is conveyed by adopting air pressure sectional type pneumatic conveying;