CN114905266B - Automatic flexible rivet nut device - Google Patents

Abstract

The invention discloses an automatic flexible rivet nut device which comprises an automatic rivet nut gun, a moving device for driving the automatic rivet nut gun to move, a control device for controlling the moving device to act, a nut conveying device, a part conveying belt, a part fixing mechanism for positioning a part and a positioning device, wherein the positioning device comprises a support and a positioning pin capable of vertically lifting, the upper end of the positioning pin is movably arranged on the support, the lower end of the positioning pin is conical, when the part is positioned at a rivet position, the positioning pin descends, the lower end of the conical shape is inserted into a rivet hole of the part, when the axis of the positioning pin deviates from the center of the rivet hole, the rivet hole enables the positioning pin to move and automatically center, and the control device records the axis position of the positioning pin at the moment, so that the corrected rivet hole size is obtained. The invention can improve the production efficiency, reduce the labor intensity and is suitable for the nut riveting processing of sheet metal parts with low accuracy and poor consistency of the riveting position.

Description

Automatic flexible rivet nut device

Technical Field

The invention relates to the technical field of riveting equipment, in particular to an automatic flexible rivet nut pulling device.

Background

The connection mode of the screw and the nut is the most commonly used connection mode in the mechanical industry, has the advantages of convenience, reliability, low manufacturing cost and the like, and generally, a threaded hole can be directly machined on a part so as to be connected with the screw; or a screw through hole is processed on the part, and then the screw penetrates through the screw through hole and is connected with the movable nut. When the thickness of the part is thin, particularly, for a thin plate part formed by sheet metal working, it is impossible to directly work to form the screw hole, and if a movable nut is used, connection with a screw is troublesome, so that it is difficult to realize automatic production. For this purpose, a blind rivet nut has been invented, and the existing blind rivet nut generally comprises a cylindrical section, one end of the cylindrical section is provided with a threaded hole for being connected with a screw, the other end of the cylindrical section is provided with a through hole coaxially communicated with the threaded hole, and one end, close to the through hole, of the cylindrical section is provided with a flange extending radially outwards. When the rivet nut is required to be fixed on a part, the cylindrical section of the rivet nut can be firstly arranged in a rivet hole of the part, a flange of the rivet screw is abutted against the front surface of the part, then a rivet head with external threads of a rivet nut gun penetrates through a through hole to be in threaded connection with the threaded hole of the cylindrical section, the rivet head pulls the cylindrical section upwards, and the through hole section of the cylindrical section expands outwards and is pressed against the back surface of the part, so that the rivet nut is reliably riveted on the part.

In the prior art, the blind rivet nut generally adopts the following two operation modes: one is to manually hold a blind rivet nut gun, push the nut onto a rivet gun pull rod with one hand, and move the rivet gun to a preset position with one hand to carry out blind rivet nut operation. The manual rivet nut pulling operation mode has the advantages of low production efficiency, high cost, poor product consistency, high labor intensity and poor safety, and is difficult to adapt to the existing automatic production line with higher requirements; the other is to use a moving device and a control system to control the rivet nut gun rivet nut, firstly, the control system is internally provided with a part rivet hole position size for storing the rivet nut to be installed, then, the part with the rivet hole is conveyed to a fixed position by a part conveying belt to be fixed, the rivet nut is conveyed to the position by the rivet nut conveying device, at the moment, the control system controls the moving device to drive the rivet nut gun to move to the rivet hole position, and the rivet nut gun can automatically rivet the rivet nut in the rivet hole of the part. The automatic rivet nut pulling device has the advantages of high production efficiency, low labor intensity and the like, but still has the following technical defects: because the sheet metal part is subjected to sheet metal processing such as bending, the original rivet hole position is extremely easy to deviate, that is to say, the position accuracy of the rivet hole on the part is lower, the size consistency is poor, thus the rivet hole position size set in advance by the control system can deviate greatly from the actual position size of the rivet hole of the part, thereby causing rivet difficulty, and even causing rivet failure when serious, further causing poor production flexibility, narrow application range and unsatisfactory working efficiency and product quality.

Disclosure of Invention

The invention aims to provide an automatic flexible rivet nut device which can improve production efficiency, reduce labor intensity, is suitable for nut rivet processing of sheet metal parts with low rivet hole position accuracy and poor consistency, has good production flexibility and wider application range, and further improves product quality.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

the utility model provides an automatic flexible blind rivet nut device, includes the work platform that is equipped with automatic blind rivet device, is used for carrying the nut conveyor of blind rivet nut, is used for carrying the part conveyer belt of part, is used for the part fixed establishment of location part, be equipped with the blind rivet hole on the part, automatic blind rivet device includes automatic blind rivet nut rifle, drives the mobile device that automatic blind rivet nut rifle removed, the controlling means of controlling the action of mobile device, automatic blind rivet device still includes the positioner that is used for confirming the blind rivet hole position, the positioner includes the support, but the locating pin of vertical lift, the upper end of locating pin movably sets up on the support, the lower extreme of locating pin is conical, when the part conveyer belt carries the part to the position, part fixed establishment is with the part location in blind rivet position, the locating pin descends, the conical lower extreme of locating pin inserts in the blind rivet hole of part, and when the axle center of locating pin has the deviation with the center of blind rivet hole, the blind rivet hole makes the locating pin remove and automatic centering, and the controlling means records the axle center position of locating pin, then the locating pin moves on the automatic locating pin and rivets the blind rivet nut of this moment.

When the rivet nut is required to be riveted into a rivet hole of a part, on one hand, a part formed by a metal plate is conveyed to a rivet position by a part conveying belt, and the part is reliably fixed by a part fixing mechanism so as to avoid the position displacement during rivet; on the other hand, the nut conveying device conveys the rivet nut to a set position close to the rivet hole of the part, and at the moment, the moving device moves the automatic rivet nut gun to the position above the rivet hole according to the position size set by the control device, so that the rivet nut and the part can be riveted.

In particular, the invention also comprises a positioning device for determining the position of the rivet hole, wherein the positioning device comprises a positioning pin which can vertically lift and the lower end of the positioning pin is conical. Thus, after the part is positioned, the positioning pin descends and is inserted into the rivet hole of the part. It is understood that the conical locating pin and the rivet hole can realize automatic centering. That is, even if the rivet hole of the part has a certain deviation, the locating pin can still enter the rivet hole, the rivet hole can enable the locating pin to translate and automatically center, the control device can detect and record the axis position of the locating pin at the moment, and the moving device is controlled to move the automatic rivet nut gun to the position above the corrected rivet hole according to the position size, so that the height superposition of the automatic rivet nut gun and the rivet hole is ensured, and the adverse effect of the deviation of the rivet hole on rivet is effectively avoided.

Preferably, the part conveyor belt comprises a frame and a conveyor belt arranged on the frame and associated with the power element, wherein brushes are arranged on two sides of the conveyor belt and are flush with the conveyor belt in height.

When the parts are placed on the conveying belt, if the parts have high points, the soft hairbrushes on the two sides can be appropriately bent, so that the weight of the parts is supported on the conveying belt, the parts are driven by the conveying belt to move forwards, and in the process, the parts and the hairbrushes move relatively to remove granular impurities on the lower sides of the parts. Thus, when the part is conveyed to the rivet position, the part fixing mechanism is convenient to reliably clamp the part and fix the part. It should be noted that, when the part is positioned and fixed, the lower side surface of the part can be used as a positioning reference in the height direction, and the clean lower side surface of the part is favorable for accurate positioning.

Preferably, a position sensor for sensing the part is arranged beside the conveyor belt, and when the part moves to be close to the position sensor on the conveyor belt, the position sensor outputs a signal to a control device, and the control device reduces the speed of the power element, so that the moving speed of the part is reduced.

When the part moves to the position of the position sensor, the position sensor can output signals to the control device, and the control device reduces the speed of the power element, so that the moving speed of the part is reduced, and the part is positioned at the rivet pulling position accurately.

Preferably, the part conveyor belt further comprises a roller group arranged outside the hairbrush, and the roller group is provided with an outward inclined guide strip near the starting end of the conveyor belt.

The leading-in strip of the roller set front end in both sides is the splayed, is convenient for the entering of part, and the roller set of both sides can make the part accurate positioning in the left and right directions on the one hand, is convenient for its forward movement again.

Preferably, the roller set comprises a roller mounting strip arranged along the conveying direction of the conveying belt and a plurality of rollers arranged on the upper side of the roller mounting strip at intervals, a long round blind hole arranged transversely is formed in the roller mounting strip, a roller shaft of the roller is arranged in the long round blind hole, a pressure spring propping against the outer side of the roller shaft is arranged in the long round blind hole, and when the width of a part is larger than a gap between the rollers corresponding to the roller sets on two sides, the roller shaft enables the pressure spring to compress and move outwards synchronously, so that the center line of the part is kept unchanged.

When the width dimension of the part is bigger, the side edge of the part can extrude the roller outwards, and the roller shaft overcomes the elasticity of the pressure spring and moves outwards in the long round blind hole, so that good self-adaption is realized with the actual width dimension of the part. It can be understood that the elastic force of the compression springs of the rollers at the two sides is consistent, so that the rollers at the two sides can be ensured to synchronously move outwards, and the central line of the part in the length direction is ensured to be unchanged all the time. Of course, the gap between the corresponding rollers at the left and right sides in the initial state can be smaller than the design width of the part, so as to ensure the elastic clamping and positioning of the rollers on the part.

Preferably, the part fixing mechanism comprises a bracket, a lower supporting rod and an upper pressing rod, wherein the lower supporting rod and the upper pressing rod are arranged on the bracket in a vertically movable mode, a pressing block is arranged at the lower end of the upper pressing rod, a positioning block is arranged on one side of the lower supporting rod, when the part moves to a rivet pulling position, the lower supporting rod ascends, the front side of the part abuts against the lower supporting rod to be positioned and supported on the positioning block, then the upper pressing rod moves downwards, and the pressing block presses the part to fix the part.

When the part is conveyed to a position close to the rivet pulling position, the lower supporting rod drives the positioning block to ascend, the front side of the part at the moment is propped against the lower supporting rod to be positioned in the front-rear direction, meanwhile, the front side of the part is supported on the positioning block of the lower supporting rod to be positioned in the height direction, then the upper pressing rod moves downwards, the pressing block presses the part to fix the part, and further accurate positioning and fixing of the part at the rivet pulling position are completed. In addition, the parts are basically not acted by the acting force in the up-down direction in the riveting process, so that the upper pressing rod and the lower supporting rod can be reliably positioned in the height direction.

Preferably, the moving device comprises an upper support and a lower support for supporting the automatic rivet nut gun, wherein the lower support comprises a lower support block with a spherical cavity and a connecting ring which is matched in the spherical cavity, the center of the connecting ring is provided with a connecting through hole, and the lower support block is provided with a mounting through hole which penetrates through the spherical center of the spherical cavity and penetrates through the upper side and the lower side; the automatic rivet nut gun comprises a connecting rod on the upper portion, the connecting rod is matched in a connecting through hole of a connecting ring, the upper end of the connecting rod extending out of the connecting ring is located in the positioning hole, a plurality of tension springs radially connected with the connecting rod are arranged on the inner side wall of the positioning hole, and the tension springs are evenly distributed in the circumferential direction.

When the moving device drives the automatic rivet nut gun to move to the position above the rivet pulling hole and start rivet pulling connection, if the center position of the rivet pulling hole is deviated from the axis of the connecting rod of the automatic rivet nut gun, lateral bending stress is formed on the rivet pulling head of the automatic rivet nut gun, the accuracy of the automatic rivet nut gun is reduced, and the service life of the automatic rivet nut gun is shortened. For this reason, the automatic rivet nut gun is positioned and supported by the upper support and the lower support, and of course, the connecting rod should be coaxially arranged with the rivet head of the automatic rivet nut gun.

Because the connecting ring is fit in the spherical cavity, the connecting ring can rotate 360 degrees around the center of the spherical cavity. In addition, the upper end of the connecting rod is elastically positioned by the tension spring supported by the upper support, so that the connecting rod can slightly swing 360 degrees around the spherical center of the spherical cavity, the connecting rod and the rivet head of the automatic rivet nut gun are ensured to be coaxial with the rivet hole, lateral bending stress born by the rivet head of the rivet nut gun in the rivet pulling process is effectively eliminated, and the service life of the automatic rivet nut gun is prolonged.

Preferably, the lower end surface of the lower supporting block is provided with a rectangular hole, the center line of the rectangular hole penetrates through the sphere center of the spherical cavity, the depth of the rectangular hole extends to the sphere center of the spherical cavity, the width of the rectangular hole is 1.1-1.2 times of the thickness of the connecting ring, and the length of the rectangular hole is 1.01-1.03 times of the diameter of the spherical cavity.

Because the lower end face of the lower supporting block is provided with a rectangular hole, the width of the rectangular hole is larger than the thickness of the connecting circular ring, and the length of the rectangular hole is larger than the diameter of the spherical cavity. Therefore, when assembling, we can make the connecting ring rotate 90 degrees, that is, put into the rectangular hole with the thickness of the connecting ring until the sphere center of the outer sphere of the connecting ring coincides with the sphere center of the spherical cavity, at this time, the connecting ring rotates 90 degrees again, so that the outer sphere of the connecting ring fits in the spherical cavity. The connecting rod on the automatic rivet nut gun can be connected in the connecting through hole of the connecting ring through the mounting through hole, and the connecting ring can be prevented from falling out of the spherical cavity, so that the assembling and the disassembling of the automatic rivet nut gun are greatly facilitated.

Because the elasticity of each tension spring in the locating hole is consistent, the upper end of the connecting rod can be ensured to be accurately positioned at the center position of the locating hole, and the connecting rod only needs to overcome the elasticity formed by the tension spring stay cord at one side when generating tiny swing, thereby being beneficial to self-adaption on the automatic rivet nut gun.

Preferably, the upper support comprises a round upper support block provided with the positioning hole, a plurality of radial through holes are formed in the outer circumferential surface of the upper support block, movable adjusting sleeves are arranged in the radial through holes, adjusting screws are connected in the adjusting sleeves in a threaded manner, the inner ends of the adjusting sleeves are connected with corresponding tension springs, and when the adjusting screws rotate positively, the adjusting sleeves can be driven to move outwards axially, so that the tension springs are tensioned.

When the adjusting screw is gradually screwed down, the adjusting screw cannot continuously move inwards and axially under the stop of the screw head, so that the adjusting sleeve can be driven to move outwards axially, and the tension spring is tensioned. It should be noted that we can make the shape of the adjusting sleeve and the same hollow square; or an axial limit groove is arranged on the outer side of the adjusting sleeve, and a limit pin which is slidably arranged in the limit groove is arranged on the inner side of the radial through hole, so that the adjusting sleeve is effectively prevented from rotating in the radial through hole.

Preferably, the support is rotatably connected with one end of a first rotating rod through a rotating shaft, the other end of the first rotating rod is hinged with one end of a second rotating rod, the other end of the second rotating rod is provided with a vertical cylinder, a downward piston rod of the cylinder is provided with the locating pin, an angle sensor for detecting the rotating angle of the first rotating rod is arranged between the first rotating rod and the rotating shaft, an angle sensor for detecting the rotating angle of the second rotating rod relative to the first rotating rod is arranged at the hinged position of the first rotating rod and the second rotating rod, an included angle between the first rotating rod and the support is alpha, the length of the first rotating rod is alpha, an included angle between the first rotating rod and the second rotating rod is beta, the length of the second rotating rod is b, and when the locating pin is inserted and positioned in the rivet hole, the rectangular coordinate size of the rivet hole relative to the rotating shaft is:

x＝acosα-bcos(β-α)，

y＝asinα+bsin(β-α)。

it will be appreciated that the position of the locating pin may be varied as the first and second levers are rotated. In the prior art, people usually realize the position movement in a plane through two mutually perpendicular sliding rails, such as a large carriage and a small carriage of a lathe, but the structure has the problem that the power required by the movement is large, that is, the small movement of the positioning pin is difficult to drive the movement of the large carriage. The invention creatively utilizes the rotation of the first rotating rod and the second rotating rod to realize the position adjustment of the locating pin, thereby not only effectively reducing the resistance in moving, but also conveniently calculating and obtaining the rectangular coordinate size of the locating pin through the angle sensor.

Therefore, the invention has the following beneficial effects: the nut riveting machine not only can improve production efficiency and reduce labor intensity, but also is suitable for nut riveting processing of sheet metal parts with low accuracy and poor consistency of riveting position, has good production flexibility and wider application range, and further improves product quality.

Drawings

Fig. 1 is a schematic structural view of the part.

Fig. 2 is a schematic view of a structure of the present invention.

Fig. 3 is a schematic view of a structure of the positioning device.

Fig. 4 is a schematic view of a structure of the part conveyor.

Fig. 5 is a schematic view of a roller set.

Fig. 6 is a schematic view of another construction of the roller set.

Fig. 7 is a schematic structural view of the part fixing structure.

Fig. 8 is a schematic diagram of a connection structure of the automatic blind rivet nut gun with the upper support and the lower support.

Fig. 9 is a schematic view of a connection structure of the connection rod and the upper support.

FIG. 10 is a schematic diagram of the connection structure of the locating pin with the first and second rotating rods.

In the figure: 1. part 11, rivet hole 2, work platform 21, automatic rivet nut gun 211, connecting rod 22, moving device 3, nut transporting device 4, part conveyor 41, frame 42, conveyor belt 43, brush 44, roller group 441, roller mounting bar 442, roller 443, oblong blind hole 444, pressure spring 45, lead-in bar 5, part fixing mechanism 51, bracket 52, upper pressure bar 521, press block 53, lower support bar 531, positioning block 6, positioning device 61, positioning pin 62, first rotating rod 62, second rotating rod 7, upper support 71, upper support block 711, positioning hole 712, radial through hole 713, adjustment sleeve 714, adjustment screw 72, tension spring 8, lower support 81, lower support block 811, spherical cavity 812, rectangular hole 82, connecting ring.

Detailed Description

The invention is further described below with reference to the drawings and detailed description.

The utility model provides an automatic flexible rivet nut device, it is applicable to the rectangular part 1 of sheet metal shaping as shown in figure 1, is equipped with and draws the riveting hole 11 at part width direction's side, specifically, as shown in figure 2, automatic flexible rivet nut device is including being equipped with automatic work platform 2 that draws the riveting device, is used for carrying the nut conveyor 3 that draws the riveting nut, is used for carrying the part conveyer belt 4 of part, is used for locating the part fixed establishment 5 of part, automatic rivet device includes automatic rivet nut rifle 21, drives the mobile device 22 that automatic rivet nut rifle removed, the controlling means of controlling the mobile device action.

It is known that, for the sheet metal formed part, after the side provided with the rivet hole is formed by several bending processes, the original rivet hole position generates larger deviation (usually less than 5 mm), and for this purpose, the automatic rivet device further comprises a positioning device 6 for determining the actual rivet hole position as shown in fig. 3, the positioning device comprises a bracket and a positioning pin 61 capable of vertically lifting, the upper end of the positioning pin is movably arranged on the bracket, and the lower end of the positioning pin is conical. When the part conveyor belt conveys the part in place and the part fixing mechanism positions the part at the rivet pulling position, the locating pin descends, the conical lower end of the locating pin is inserted into the rivet pulling hole of the part, when the axis of the locating pin deviates from the center of the rivet pulling hole, the rivet pulling hole enables the locating pin to transversely move and automatically center, the control device records the axis position of the locating pin at the moment, namely the new axis position after adjustment, then the locating pin moves upwards, and the control device enables the automatic rivet pulling nut gun to start riveting of the rivet pulling nut and the part according to the new axis position.

It is understood that the conical locating pin and the rivet hole can realize automatic centering. That is, even if the rivet hole of the part has a certain deviation, the locating pin can still enter the rivet hole, the rivet hole can enable the locating pin to translate and automatically center, the control device can detect and record the axis position of the locating pin at the moment, and the moving device is controlled to move the automatic rivet nut gun to the position above the corrected rivet hole according to the position size, so that the height superposition of the automatic rivet nut gun and the rivet hole is ensured, and the adverse effect of the deviation of the rivet hole on rivet is effectively avoided.

It should be noted that the deviation of the rivet hole position should not be larger than the radius of the rivet hole, so as to avoid that the positioning pin cannot enter the rivet hole. In addition, the automatic rivet pulling device, the automatic rivet pulling nut gun, the nut conveying device, the part conveying belt, the part fixing mechanism and the like can all adopt the devices existing in the prior art.

Preferably, as shown in fig. 4, the part conveyor comprises a frame 41, a conveyor 42 arranged on the frame in association with the power element, and brushes 43 arranged on both sides of the conveyor, said brushes being level with the conveyor.

When the part is placed on the conveying belt, the parts are bent at the high points by appropriately pressing the soft brushes on the two sides, so that the weight of the part is supported on the conveying belt, the conveying belt is convenient for driving the part to move forwards, and in the process, the part and the brushes move relatively to remove granular impurities on the lower side of the part. Thus, when the part is conveyed to the rivet position, the part fixing mechanism is convenient to reliably clamp the part and fix the part. It should be noted that, when the part is positioned and fixed, the lower side surface of the part can be used as a positioning reference in the height direction, and the clean lower side surface of the part is favorable for accurate positioning.

Further, a position sensor for sensing the parts can be arranged beside the conveyor belt. Therefore, the parts can be conveyed on the conveying belt at a higher speed, when the parts move to be close to the position sensor on the conveying belt, the position sensor outputs signals to the control device, the control device reduces the speed of the power element, and then the moving speed of the parts is reduced, so that the parts can be positioned at the rivet pulling position accurately.

Still further, the part conveyor belt further includes roller sets disposed outside the brushes at each side, as shown in fig. 5, the roller sets 44 are provided with guiding strips 45 inclined outwards near the start end of the conveyor belt, the guiding strips at the front ends of the roller sets at both sides are splayed, so that the parts can be conveniently entered, and the roller sets at both sides can accurately position the parts in the left-right direction on one hand and facilitate the forward movement of the parts. Of course, the gap between the roller sets at the two sides should be slightly larger than the width dimension of the part, so as to ensure that the scarf can enter between the roller sets at the left side and the right side.

In order to ensure accurate positioning of the parts entering between the roller groups in the left-right direction, as shown in fig. 5 and 6, the roller groups comprise roller mounting strips 441 arranged along the conveying direction of the conveying belt, and a plurality of rollers 442 arranged on the upper sides of the roller mounting strips at intervals and provided with roller shafts, the roller mounting strips are provided with long round blind holes 443 arranged along the transverse direction, and the roller shafts of the rollers are arranged in the long round blind holes. And a pressure spring 444 which is used for pressing the outer side of the roller shaft is arranged at the outer side in the long round blind hole, so that the roller is driven to move relatively to the inner side in the axial direction. That is, in the initial state, the gap between the rollers on the left and right sides may be smaller than the minimum dimension of the part width. When the width of the part is larger than the gap between the rollers corresponding to the roller groups on the two sides, the part can push the rollers to move outwards, and at the moment, the roller shaft enables the pressure spring to compress and move outwards synchronously, so that good self-adaption is realized with the actual width size of the part. Because the elastic force of the compression springs of the rollers at the two sides is consistent, the rollers at the two sides can be ensured to synchronously move outwards, and the central line of the part in the length direction is ensured to be unchanged all the time.

In order to facilitate the reliable positioning of the parts at the rivet position, as shown in fig. 7, the part fixing mechanism comprises a bracket 51, a lower supporting rod 53 and an upper pressing rod 52, wherein the lower supporting rod 53 and the upper pressing rod 52 are arranged on the bracket in a vertically movable manner, a pressing block 521 is arranged at the lower end of the upper pressing rod, and a positioning block 531 is arranged at one side of the lower supporting rod close to the parts. When the part moves to the rivet pulling position, the lower supporting rod rises, the front side of the part, provided with the rivet pulling hole, is propped against the lower supporting rod to be positioned and supported on the positioning block, then the upper pressing rod moves downwards, and the pressing block and the positioning block jointly act to press and position the part. In addition, the parts are basically not acted by the acting force in the up-down direction in the riveting process, so that the upper pressing rod and the lower supporting rod can be reliably positioned in the height direction.

As another preferred solution, as shown in fig. 8, the moving device comprises an upper support 7 and a lower support 8 for supporting the automatic rivet nut gun, the lower support comprises a lower support block 81 with a spherical cavity 811, and a connecting ring 82 fitted in the spherical cavity, that is, the outer circumference of the connecting ring is a sphere fitted with the spherical cavity, so that the connecting ring can rotate 360 degrees around the center of the spherical cavity, and of course, a connecting through hole should be arranged at the center of the connecting ring. In addition, the lower supporting block is provided with a mounting through hole which penetrates through the sphere center of the spherical cavity and penetrates through the upper side and the lower side; the upper support comprises a positioning hole 711 coaxial with the mounting through hole, the automatic rivet nut gun comprises a connecting rod 211 at the upper part, the connecting rod is adapted in the connecting through hole of the connecting ring, the upper end of the connecting rod extending out of the connecting ring is positioned in the positioning hole, a plurality of tension springs 72 radially connected with the connecting rod are arranged on the inner side wall of the positioning hole, and the tension springs are uniformly distributed in the circumferential direction. That is, the connecting ring is limited in the height direction of the connecting rod, and the tension spring in the positioning hole positions the upper end of the connecting rod, so that the connecting rod is in a vertical state in the initial state.

Because the lower part of the connecting rod is positioned in the spherical cavity through the connecting ring, and the upper end of the connecting rod is elastically positioned by the upper supporting tension spring, when the moving device drives the automatic rivet nut gun to move to the position above the rivet hole and start rivet connection, if the center position of the rivet hole is deviated from the axis of the connecting rod of the automatic rivet nut gun, the rivet head of the automatic rivet nut gun can form lateral bending stress, and at the moment, the connecting rod can slightly swing 360 degrees around the spherical center of the spherical cavity, so that the connecting rod, the rivet head of the automatic rivet nut gun and the rivet hole are coaxial, the lateral bending stress born by the rivet head of the rivet nut gun in the rivet process is effectively eliminated, and the service life of the automatic rivet nut gun is prolonged.

It should be noted that, we can make the connecting rod form threaded connection with the connection through-hole that connects the ring to be located the connecting rod and connect the ring downside and set up the location shoulder, be located the connecting rod and connect the ring upside and set up lock nut, thereby can ensure the reliable location of connecting rod in the direction of height. That is, the upper support at this time does not need to provide a supporting force in the height direction.

For convenient assembly, a rectangular hole 812 can be arranged on the lower end surface of the lower supporting block, the center line of the rectangular hole penetrates through the sphere center of the spherical cavity, the depth of the rectangular hole extends to the sphere center of the spherical cavity, the width of the rectangular hole is 1.1-1.2 times of the thickness of the connecting circular ring, and the length of the rectangular hole is 1.01-1.03 times of the diameter of the spherical cavity.

Thus, when the connecting ring is required to be assembled into the spherical cavity, the connecting ring can be rotated by 90 degrees, and the axis of the connecting through hole of the connecting ring is approximately perpendicular to the central line of the rectangular hole. Then the connecting ring is placed into the rectangular hole with the thickness of the connecting ring until the spherical center of the outer spherical surface of the connecting ring coincides with the spherical center of the spherical cavity, and the connecting ring is rotated by 90 degrees at the moment, so that the outer spherical surface of the connecting ring is adapted to the spherical cavity. The connecting rod on the automatic rivet nut gun can be connected in the connecting through hole of the connecting ring through the mounting through hole, and the connecting ring can be prevented from falling out of the spherical cavity, so that the assembling and the disassembling of the automatic rivet nut gun are greatly facilitated.

Because the elasticity of each tension spring in the locating hole is consistent, the upper end of the connecting rod can be ensured to be accurately positioned at the center position of the locating hole, and the connecting rod only needs to overcome the elasticity formed by the tension spring at one side when generating tiny swing, thereby being beneficial to self-adaption on the automatic rivet nut gun.

Further, as shown in fig. 8 and 9, the upper support includes a circular upper support block 71 provided with the positioning hole, a plurality of radial through holes 712 are provided on the outer circumference of the upper support block, a movable adjusting sleeve 713 is provided in the radial through holes, an adjusting screw 714 is screwed in the adjusting sleeve, and the inner end of the adjusting sleeve is connected with a corresponding tension spring.

When the adjusting screw is rotated forward and gradually screwed down, the adjusting screw cannot move inwards and axially continuously under the stop of the screw head, so that the adjusting sleeve can be driven to move outwards axially, and the tension spring is tensioned. It should be noted that we can make the shape of the adjusting sleeve and the same hollow square; or an axial limit groove is arranged on the outer side of the adjusting sleeve, and a limit pin which is slidably arranged in the limit groove is arranged on the inner side of the radial through hole, so that the adjusting sleeve is effectively prevented from rotating in the radial through hole.

For the horizontal migration of locating pin, the support rotates through the one end of axis of rotation and a horizontally first bull stick 62 to be connected, and the other end of first bull stick articulates with the one end of a horizontally second bull stick 63 mutually, and the other end of second bull stick is equipped with vertical cylinder, is equipped with on the decurrent piston rod of cylinder locating pin is equipped with the angle sensor that is used for detecting first bull stick turned angle between first bull stick and axis of rotation, is equipped with the angle sensor that is used for detecting the relative first bull stick turned angle of second bull stick in the articulated department of first bull stick and second bull stick. In addition, we can set the contained angle between first bull stick and the support to be alpha, and the length of first bull stick is set to a, and the contained angle between first bull stick and the second bull stick is set to beta, and the length of second bull stick is set to b, and when the locating pin pegged graft and is fixed in the riveting hole, the rectangular coordinate size of riveting hole relative to the axis of rotation is:

x＝acosα-bcos(β-α)，

y＝asinα+bsin(β-α)。

in the prior art, the position movement in two directions of X, Y in a plane, such as a large carriage and a small carriage of a lathe, is usually realized by two mutually perpendicular slide rails, but the structure has the problem that the power required for movement is large, that is, the small movement of the positioning pin is difficult to drive the synchronous movement of the large carriage and the small carriage. The invention creatively utilizes the rotation of the first rotating rod and the second rotating rod to realize the position adjustment of the locating pin, thereby not only effectively reducing the resistance in moving, but also conveniently calculating and obtaining the rectangular coordinate size of the locating pin through the angle sensor.

Claims (8)

1. The utility model provides an automatic flexible blind rivet nut device, includes the work platform that is equipped with automatic blind rivet device, is used for carrying the nut conveyor of blind rivet nut, is used for carrying the part conveyer belt of part, is used for the part fixed establishment of location part, be equipped with the blind rivet hole on the part, automatic blind rivet device includes automatic blind rivet nut rifle, drives the mobile device that automatic blind rivet nut rifle removed, the controlling means of controlling the action of mobile device, characterized by, the part conveyer belt includes the frame, sets up the conveyer belt that associates with the power component in the frame, is equipped with the brush in the both sides of conveyer belt, the brush is high with the conveyer belt to be leveled, part fixed establishment of institution is including the support, can set up lower back-up lever on the support with the back-up lever, and the lower extreme of back-up lever is equipped with the briquetting, and part one side is close to the lower back-up lever is equipped with the locating piece, automatic blind rivet device still includes the locating device that is used for confirming the blind rivet hole position, but locating pin's upper end movably sets up on the support, the lower extreme of locating pin is conical, the locating pin is the end, and is the taper-shaped, and when setting up and the locating pin is located the position of the mandrel, and the locating pin is located the automatic blind rivet nut that the mandrel is located in the position, when the position of part is fixed, and the mandrel is located in the position of the mandrel, when the rivet device is located the mandrel.

2. An automated clinch nut apparatus as claimed in claim 1, wherein a position sensor is provided adjacent the conveyor for sensing the part, the position sensor outputting a signal to a control device which reduces the speed of the power element and in turn slows the speed of movement of the part as the part moves on the conveyor to approach the position sensor.

3. The automatic flexible blind rivet nut device as recited in claim 1, further comprising a roller set disposed outside of said brush, said roller set being provided with an outwardly inclined lead-in bar near a start end of said conveyor.

4. The automatic flexible rivet nut device according to claim 3, wherein the roller group comprises a roller mounting bar arranged along the conveying direction of the conveying belt and a plurality of rollers arranged on the upper side of the roller mounting bar at intervals, a long round blind hole arranged along the transverse direction is formed in the roller mounting bar, a roller shaft of the rollers is arranged in the long round blind hole, a pressure spring pressing the outer side of the roller shaft is arranged in the long round blind hole, and when the width of a part is larger than the gap between rollers corresponding to the roller groups on two sides, the roller shaft enables the pressure spring to compress and move outwards synchronously, so that the center line of the part is kept unchanged.

5. The automatic flexible blind rivet nut device according to claim 1, wherein the moving device comprises an upper support and a lower support for supporting the automatic blind rivet nut gun, the lower support comprises a lower support block with a spherical cavity, a connecting circular ring which is matched in the spherical cavity, a connecting through hole is arranged in the center of the connecting circular ring, and a mounting through hole which penetrates through the spherical center of the spherical cavity and penetrates through the upper side and the lower side is arranged on the lower support block; the automatic rivet nut gun comprises a connecting rod on the upper portion, the connecting rod is matched in a connecting through hole of a connecting ring, the upper end of the connecting rod extending out of the connecting ring is located in the positioning hole, a plurality of tension springs radially connected with the connecting rod are arranged on the inner side wall of the positioning hole, and the tension springs are evenly distributed in the circumferential direction.

6. The automatic flexible rivet nut device according to claim 5, wherein a rectangular hole is formed in the lower end face of the lower support block, the center line of the rectangular hole penetrates through the center of the spherical cavity, the depth of the rectangular hole extends to the center of the spherical cavity, the width of the rectangular hole is 1.1-1.2 times the thickness of the connecting ring, and the length of the rectangular hole is 1.01-1.03 times the diameter of the spherical cavity.

7. The automatic flexible rivet nut device according to claim 5, wherein the upper support comprises a round upper support block provided with the positioning holes, a plurality of radial through holes are formed in the outer circumferential surface of the upper support block, movable adjusting sleeves are arranged in the radial through holes, adjusting screws are connected in the adjusting sleeves in a threaded manner, the inner ends of the adjusting sleeves are connected with corresponding tension springs, and when the adjusting screws rotate positively, the adjusting sleeves can be driven to move outwards axially, so that the tension springs are tensioned.

8. The automatic flexible rivet nut device according to claim 1, wherein the bracket is rotatably connected with one end of a first rotating rod through a rotating shaft, the other end of the first rotating rod is hinged with one end of a second rotating rod, the other end of the second rotating rod is provided with a vertical cylinder, the downward piston rod of the cylinder is provided with the locating pin, an angle sensor for detecting the rotating angle of the first rotating rod is arranged between the first rotating rod and the rotating shaft, an angle sensor for detecting the rotating angle of the second rotating rod relative to the first rotating rod is arranged at the hinged position of the first rotating rod and the second rotating rod, the included angle between the first rotating rod and the bracket is alpha, the length of the first rotating rod is a, the included angle between the first rotating rod and the second rotating rod is beta, the length of the second rotating rod is b, and when the locating pin is inserted and located in the rivet hole, the rectangular coordinate size of the rivet hole relative to the rotating shaft is as follows: x=acos a-bcos (β -a),

y＝asinα+bsin(β-α)。

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