CN108891185B

CN108891185B - Full-automatic crystal bead serial connection method

Info

Publication number: CN108891185B
Application number: CN201810581693.6A
Authority: CN
Inventors: 蒙臻; 史雨; 冯凯; 盛华龙; 倪敬
Original assignee: Hangzhou Dianzi University
Current assignee: Hangzhou Dianzi University
Priority date: 2018-06-07
Filing date: 2018-06-07
Publication date: 2020-11-24
Anticipated expiration: 2038-06-07
Also published as: CN108891185A

Abstract

A high-precision full-automatic crystal bead serial connection method. The invention discloses a high-precision full-automatic bead stringing method. The existing bead stringing device has higher requirement on the size of the hole of the crystal bead, and along with the aging and the abrasion of a machine, the precision degree of a crochet hook is reduced. The bead stringing device adopted by the invention comprises a bottom plate, a vibrating disc discharging mechanism, a rotary material moving mechanism, a material moving mechanical arm, a four-station clamping mechanism and a wire winding and looping mechanism. The material moving mechanical arm comprises a lifting motor, a lifting eccentric wheel, a lifting gear wheel disc, a square shaft, a sliding seat, a lifting seat, a transfer motor and a pneumatic clamping jaw. The four-station clamping mechanism comprises a rotating shaft assembly, a station conversion driving assembly, a bead clamping driving assembly and a clamping frame. The crystal bead clamp comprises a slide rail, a fixed clamping block, a movable clamping block, a bead clamping spring and a clamping pin. The wire winding and looping mechanism comprises a looping cutting assembly, a straightening assembly, a looping frame and a looping cutting driving assembly. The invention can realize the one-by-one continuous series connection of the double-hole crystal octagonal beads and realize the high automation of the series connection of the double-hole crystal octagonal beads.

Description

Full-automatic crystal bead serial connection method

Technical Field

The invention belongs to the technical field of automatic production of crystal beads, and particularly relates to a full-automatic crystal bead serial connection method.

Background

The double-hole crystal octagonal bead is a popular traditional Chinese hand-knitted product, and is deeply popular with customers in the decoration fields of curtain decoration, lamp decoration and the like by means of exquisite appearance design and various styles and styles. However, in the conventional manual processing mode, the beads can only be connected in a needle and thread mode, so that the production efficiency is low, the labor cost is high, and the market development of the beads is greatly limited. Although some automatic bead stringing machines appear on an e-commerce platform, the automation of the bead stringing machines is extremely low, a large amount of manual assistance is needed, the style of the beads is also greatly limited, and the production efficiency is not greatly improved compared with the manual operation.

In view of the above, some fully automatic bead stringing machines with higher integration and automation degree have come into play. For example, patent application No. CN104057760A discloses an automatic bead knotting machine for curtain pendants, which realizes series connection of beads mainly by passing bead hooks through bead holes. The device mainly comprises four modules of fixing, driving, bead feeding and knotting, has the advantages of convenient part replacement, reduced manual workload, capability of sequentially arranging the beads and the like. But the disadvantage is also obvious, which can only realize the stacking of the beads and is difficult to realize a more complex knotting mode, but the connection of the beads is not only the connection of the silk threads. Secondly, due to the working principle of the bead string, the size of the hole of the bead string is also greatly limited. And as the machine ages, wears out, it is more difficult for the crochet hook to catch the lifting rope as accurately as it is at first. Therefore, the invention is particularly important for the automation device which can simply and quickly realize the serial connection of the beads.

Disclosure of Invention

The invention aims to provide a full-automatic crystal bead serial connection method.

The bead stringing device adopted by the invention comprises a bottom plate, a vibrating disc discharging mechanism, a rotary material moving mechanism, a material moving mechanical arm, a four-station clamping mechanism and a wire winding and looping mechanism. The vibration disc discharging mechanism comprises a vibration disc, a straight vibration device, a conveying rail bar, a discharging block, a material blocking block and a material blocking spring. The vibration disk is fixed on the bottom plate. The conveying rail is fixed with the vibration disk. The top surface of the conveying rail bar is provided with a conveying chute. The bottom surface of the conveying rail bar is fixed with the straight vibration device. The inlet end of the conveying chute is communicated with the discharge hole of the vibrating disc. The inlet end of the discharging block is fixed with the outlet end of the conveying chute. The top surface of the discharging block is provided with a discharging groove. The exit end of the bottom surface of the discharging groove is provided with a yielding through groove. The abdicating through groove is communicated with the end face of the outlet end of the discharging block. The two material blocking blocks are arranged at the outlet end of the material discharging block in a centering manner; the distance between the two material blocking blocks is smaller than the width of the discharge chute; one ends of the two material blocking springs are fixed to one ends of the two material blocking blocks respectively, and the other ends of the two material blocking springs are fixed to the discharging block.

The rotary material moving mechanism comprises a material moving frame, a material moving motor, a synchronous belt pulley, a tensioning block, a tensioning shaft, a material moving plate, a sliding table cylinder, an upper support seat, a lower support seat, an upper clamping pipe, a lower clamping pipe, an optical fiber laser correlation sensor and a rotary motor. The material moving frame is fixed on the bottom plate. The tensioning block and the material moving frame form a sliding pair and are fixed through a set screw. The tensioning shaft is fixed on the tensioning block. The material moving motor is fixed on the material moving frame, and an output shaft of the material moving motor is coaxially fixed with a synchronous belt wheel. The other synchronous pulley is supported on the tension shaft. The two synchronous pulleys are connected through a synchronous belt. The material moving plate and the material moving frame form a sliding pair and are fixed with the synchronous belt. The sliding table cylinder is fixed with the material moving plate. The upper supporting seat, the lower supporting seat and the two sliding blocks of the sliding table cylinder are respectively fixed. The top end of the upper clamping pipe and the upper support seat form a revolute pair. The rotary motor is fixed with the lower support seat. And an output shaft of the rotary motor is fixed with the bottom end of the lower clamping pipe. The upper clamping pipe and the lower clamping pipe are coaxially arranged. And the transmitter and the receiver of the optical fiber laser correlation sensor are respectively fixed on the upper supporting seat and the lower supporting seat.

The material moving mechanical arm comprises a lifting motor, a lifting wheel, a lifting gear wheel disc, a square shaft, a sliding seat, a lifting seat, a connecting plate, a transfer motor and a pneumatic clamping jaw. The sliding seat and the lifting motor are fixed on the material moving frame through the connecting plate. The output shaft of the lifting motor is horizontally arranged and is eccentrically fixed with the lifting wheel. The square shaft and the sliding seat form a sliding pair. And the two lifting gear wheel discs are fixed on the square shaft. The lifting gear wheel disc is provided with a lifting moving plate. The lifting wheel is positioned between the lifting plates in the two lifting gear wheel discs. The diameter of the lifting wheel is equal to the distance between the two lifting plates. The lifting seat is fixed with the bottom end of the square shaft. The transfer motor is fixed on the lifting seat. The output shaft of the transfer motor is vertically arranged and fixed with the pneumatic clamping jaw.

The four-station clamping mechanism comprises a rotating shaft assembly, a station conversion driving assembly, a bead clamping driving assembly and a clamping frame. The clamping frame is fixed with a looping frame in the wire winding looping mechanism. The rotating shaft assembly comprises a central rotating shaft, a rotating drum, an inner mounting column, an outer mounting disc and a crystal bead clamp. The inner end of the central rotating shaft is supported on the clamping frame, the middle part of the central rotating shaft is fixed with the inner mounting column, and the outer end of the central rotating shaft is fixed with the outer mounting plate. Four first mounting grooves which are circumferentially and uniformly distributed along the axis of the inner mounting column are formed in the end face of the inner mounting column. The rotary drum is sleeved on the outer side of the inner mounting column and fixed with the inner mounting column. Four second mounting grooves which are uniformly distributed along the axial direction of the outer mounting disc are formed in the end face of the outer end of the outer mounting disc. The cross section of the second mounting groove is identical to that of the first mounting groove. The four first mounting grooves correspond to the four second mounting grooves in position respectively.

The crystal bead clamp comprises a slide rail, a fixed clamping block, a movable clamping block, a bead clamping spring and a clamping pin. The inner end of the working side face of the slide rail is provided with a limiting bulge, and the outer end of the slide rail is fixed with the fixed clamping block. The movable clamping block and the middle part of the working side surface of the slide rail form a sliding pair. The two ends of the ball clamping spring are respectively fixed with the limiting bulge and the end surface of the opposite end of the movable clamping block. The inner end of the clamping pin is fixed with the movable clamping block. The number of the crystal bead clamps is four. The four crystal bead clamps are respectively fixed in the four first mounting grooves and the second mounting groove.

The station conversion driving assembly comprises a station conversion motor, a coding disc and a station detection sensor. The station detection sensor adopts a photoelectric sensor. The station switching motor is fixed with the clamping frame. One output shaft of the station switching motor is fixed with the inner end of the central rotating shaft. And the other output shaft of the station switching motor is fixed with the coding disc. Four detection holes are uniformly distributed along the circumferential direction of the axis of the coding disc. The station detection sensor is fixed with the clamping frame. The detection head of the station detection sensor is arranged towards the coding disc, and the distance from the detection head to the axis of the coding disc is equal to the distance from the axis of the detection hole to the axis of the coding disc.

The ball clamping driving assembly comprises a first air cylinder, a second air cylinder, a first shifting plate and a second shifting plate. The first cylinder and the second cylinder are both fixed with the clamping frame. The push-out rods of the first cylinder and the second cylinder are respectively fixed with the first shifting plate and the second shifting plate. The first shifting plate is positioned right above the rotating shaft assembly. The second dial plate is positioned on one side of the rotating shaft component. The distance from the first shifting plate and the second shifting plate to the axis of the central rotating shaft is smaller than the distance from the end face of the outer end of the clamping pin to the axis of the central rotating shaft.

The four crystal bead clamps correspond to four stations. The four stations are respectively a feeding station, a first wire threading station, a second wire threading station and a discharging station which are sequentially arranged in a ring shape along the circumferential direction of the central rotating shaft. The working side surface of the slide rail in the crystal bead clamp at the feeding station faces to the right upper side.

The wire winding and looping mechanism comprises a looping cutting assembly, a straightening assembly, a looping frame and a looping cutting driving assembly. The looper frame is fixed on the bottom plate. The straightening assembly comprises an adjusting bolt, an adjusting slide block, a U-shaped bearing and a straightening frame. The straight grinding frame is provided with n adjusting slide blocks which are sequentially arranged along the length direction of the straight grinding frame, and n is more than or equal to 3 and less than or equal to 20. All the adjusting slide blocks and the straight grinding frame form a sliding pair which slides along the width direction of the straight grinding frame. N adjusting bolt groups are arranged on the vertical rolling frame. The adjusting bolt group consists of two adjusting bolts. The n adjusting bolt groups correspond to the n adjusting sliding blocks one by one. Two adjusting bolts in the same adjusting bolt group are respectively positioned at two sides of the vertical rolling frame and respectively abut against two ends of the corresponding adjusting slide blocks. And U-shaped bearings are supported on the n adjusting sliding blocks. And sequencing the n adjusting slide blocks in sequence along the length direction of the straight grinding frame. The adjusting slide block with the odd serial number is the first adjusting slide block. The adjusting slide block with even number is the second adjusting slide block. The U-shaped bearings on all the first adjusting sliding blocks are aligned in the width direction of the straight grinding frame. And U-shaped bearings on all the second adjusting sliding blocks are aligned in the width direction of the straightening frame. The U-shaped bearing on the first adjusting sliding block and the U-shaped bearing on the second adjusting sliding block are arranged in a staggered mode in the width direction of the vertical rolling frame.

The number of the straightening assemblies is two. The axes of the U-shaped bearings in the two straightening assemblies are perpendicular to each other. The rolling target lines of the two rolling assemblies are overlapped. The rolling target line of the straightening component is the intersection line of the transverse rolling target surface and the longitudinal rolling target surface. The transverse rolling target surface is a symmetrical surface of two end surfaces of the U-shaped bearing. The longitudinal rolling target surface is a plane with equal distance from the axes of all U-shaped bearings.

The looper cut-off assembly comprises an adjusting bolt, a compression spring, an adjusting block, a first grinding wheel, a second grinding wheel, a cut-off cam, a cut-off rocker arm, a cutter mounting block, a looper knife, a reset spring, a first yarn guide frame and a second yarn guide frame. The second grinding wheel is supported on the looper frame. The adjusting block and the looping frame form a sliding pair. The adjusting bolt is in threaded connection with the looping frame. Two ends of the compression spring are respectively fixed with the adjusting block and the adjusting bolt. The first grinding wheel is supported on the adjusting block. The first grinding wheel is positioned right above the second grinding wheel. The first yarn guide frame and the second yarn guide frame are fixed on the coiling frame, and opposite ends of the first yarn guide frame and the second yarn guide frame are respectively close to a gap between the first rolling wheel and the second rolling wheel. Wire guiding holes are formed in the first wire guiding frame and the second wire guiding frame. The axes of the wire guide holes on the first wire guide frame and the second wire guide frame are coincided with the rolling target lines of the two rolling assemblies.

The cutter mounting block and the looping frame form a sliding pair. And two ends of the reset spring are respectively fixed with the cutter mounting block and the looper frame. The looper knife is fixed on the top of the cutter mounting block. The looper knife is provided with a first looper groove and a second looper groove. The first looping groove and the second looping groove are arc-shaped and are abutted together. The central lines of the first looping groove and the second looping groove are on the same characteristic spiral line.

The cutting cam is supported on the looper frame. The middle part of the cutting rocker arm and the looping frame form a rotating pair. One end of the cutting rocker arm is fixed with a round mounting block, and the other end of the cutting rocker arm props against the bottom of the cutter mounting block. The circular mounting block is in contact with the side of the cutoff cam. The looper cut-off driving component comprises a looper driving component and a cut-off driving component. The first rolling wheel and the second rolling wheel are driven by the looping driving piece. The cut-off cam is driven by a cut-off driver. The full-automatic bead stringing method comprises a pre-preparation method, a feeding method, a material transferring method and a wire threading method.

The preparation method comprises the following specific steps:

the double-hole crystal octagonal bead is loaded into a vibration disk. And the processing end of the iron wire penetrates through the space between the U-shaped bearing on the first adjusting slide block and the U-shaped bearing on the second adjusting slide block in the two straightening assemblies, penetrates through the wire guide holes on the first wire guide frame and the second wire guide frame and then abuts against the inlet end of the first coiling groove on the coiling knife.

The feeding method comprises the following specific steps:

step one, starting the vibration disc and the straight vibration device. The double-hole crystal octagonal beads enter the conveying rail bars and the discharging blocks one by one under the driving of the vibration disk. The double-hole crystal octagonal bead which is positioned at the position farthest away from the vibration disk reaches between the upper clamping pipe and the lower clamping pipe,

and step two, starting the sliding table cylinder to enable the upper clamping pipe and the lower clamping pipe to slide oppositely to clamp the double-hole crystal octagonal bead.

And step three, the material moving motor rotates forwards to enable the material moving plate to slide towards the material moving mechanical arm. The clamped double-hole crystal octagonal bead leaves the discharge chute.

In the sliding process of the material moving plate, if the receiver of the optical fiber laser correlation sensor cannot detect the light emitted by the emitter, the rotary motor rotates until the receiver of the optical fiber laser correlation sensor detects the light emitted by the emitter.

And step four, stopping the material moving motor after the material moving plate reaches the rotary track of the pneumatic clamping jaw. And if the pneumatic clamping jaw is not at the initial position, keeping the upper clamping tube and the lower clamping tube still, and waiting for the pneumatic clamping jaw to reach the initial position. If the pneumatic clamping jaw is located at the initial position, the pneumatic clamping jaw clamps two opposite sides of the double-hole crystal octagonal bead. The sliding table cylinder drives the upper clamping pipe and the lower clamping pipe to slide back to back, and the double-hole crystal octagonal beads are loosened. And entering the step five.

And step five, reversing the material moving motor to reset the material moving plate, and repeatedly executing the step two, the step three and the step four.

The material transferring method comprises the following specific steps:

step one, if the double-hole crystal octagonal bead is clamped on the pneumatic clamping jaw, the motor is transferred to rotate forwards, so that the double-hole crystal octagonal bead on the pneumatic clamping jaw reaches the position above the crystal bead clamp at the feeding station.

And step two, if the crystal bead clamp at the feeding station clamps the double-hole crystal octagonal bead, keeping the pneumatic clamping jaw still, and waiting for the crystal bead clamp which does not clamp the double-hole crystal octagonal bead to enter the feeding station.

If the crystal bead clamp at the feeding station does not clamp the double-hole crystal octagonal bead, the first cylinder of the crystal bead clamp at the feeding station retracts, so that the movable clamping block in the crystal bead clamp at the feeding station slides towards the direction departing from the fixed clamping block.

And step three, the lifting motor rotates forwards to enable the square shaft to slide downwards, and the double-hole crystal octagonal bead on the pneumatic clamping jaw reaches a position between a movable clamping block and a fixed clamping block in the crystal bead clamp at the feeding station.

And step four, pushing out the first cylinder, so that the movable clamping block and the fixed clamping block in the crystal bead clamp at the feeding station clamp the double-hole crystal octagonal bead.

And fifthly, loosening the double-hole crystal octagonal bead by the pneumatic clamping jaw, and reversely rotating the lifting motor to enable the square shaft to slide upwards for resetting. And entering a sixth step.

And step six, reversing the transfer motor, resetting the pneumatic clamping jaw, and repeatedly executing the step one, the step two, the step three, the step four and the step five.

The wire threading method comprises the following specific steps:

step one, if the crystal bead clamp at the feeding station does not clamp the double-hole crystal octagonal bead, waiting for the pneumatic clamping jaws to load the double-hole crystal octagonal bead into the crystal bead clamp at the feeding station.

If the crystal bead clamp at the feeding station clamps the double-hole crystal octagonal bead, the station switching motor rotates, so that the crystal bead clamp at the feeding station reaches the first wire threading station. And then executing the step two.

And step two, if the crystal bead clamp on the second wire feeding station does not clamp the double-hole crystal octagonal bead, executing the step one again.

And if the crystal bead clamps on the first wire feeding station and the second wire feeding station clamp the double-hole crystal octagonal bead, entering the third step.

And step three, the wire feeding motor and the wire discharging motor rotate, and the first grinding wheel and the second grinding wheel drive the processing end of the iron wire to slide on the inlet end of the first looping groove. After being bent in the first looping groove, the iron wire slides out of the outlet end of the first looping groove and penetrates through the wire penetrating holes of the double-hole crystal octagonal beads on the first wire penetrating station and the second wire penetrating station. And after the iron wire is wound into a ring shape, the iron wire slides into the inlet end of the second looping groove.

And step four, stopping the wire feeding motor and the wire discharging motor after the processing end of the iron wire reaches the outlet end of the second looping groove, and rotating the cutting motor to enable the looping knife to slide upwards, so that the iron wire is cut off from the inlet end of the first looping groove.

And step five, if the crystal bead clamp at the feeding station does not clamp the double-hole crystal octagonal bead, waiting for the pneumatic clamping jaws to load the double-hole crystal octagonal bead into the crystal bead clamp at the feeding station.

If the crystal bead clamp at the feeding station clamps the double-hole crystal octagonal bead, the station switching motor rotates to enable the crystal bead clamp at the second wire threading station to reach the discharging station.

And step six, retracting the second cylinder to enable the movable clamping block in the crystal bead clamp at the blanking station to slide towards the direction departing from the fixed clamping block, and enabling the double-hole crystal octagonal bead clamped by the crystal bead clamp at the blanking station to fall off. And entering the step seven.

And seventhly, pushing out by the second cylinder to reset the movable clamping block in the crystal bead clamp at the blanking station. And repeatedly executing the steps II, III, IV, V and VI.

Furthermore, the bead stringing device adopted by the invention also comprises a wire feeding mechanism. The wire feeding mechanism comprises a wire outlet motor, a wire feeding disc, a wire feeding support, a wire loading rod, an outer guide pillar, an outer guide sleeve, a wire guide rod, a wire outlet assembly and a detection assembly. The wire feeding disc is supported on the wire feeding bracket. The wire outlet motor is fixed on the wire feeding support. The output shaft of the wire outlet motor is coaxially arranged with the wire feeding disc. Four adjusting grooves radially arranged along the wire feeding disc are formed in the wire feeding disc, and the bottom ends of four wire loading rods uniformly distributed along the circumferential direction of the wire feeding disc are respectively fixed in the four adjusting grooves of the wire feeding disc. The bottom ends of four outer guide posts which are uniformly distributed along the circumferential direction of the wire feeding disc are fixed with the top of the wire feeding support. The four outer guide sleeves and the four outer guide pillars respectively form sliding pairs and are fixed through set screws respectively. The four outer guide sleeves are respectively fixed with the bottom ends of the four wire guide rods. The top ends of the four wire guide rods are provided with first wire guide rings. The yarn outlet assembly is positioned between two adjacent yarn guide rods. The wire outlet assembly comprises a wire outlet shell, a rocker and a wire outlet spring. The wire outlet shell is fixed with the wire feeding support. The inner end of the rocker is hinged with the wire outlet shell. Two ends of the wire outlet spring are respectively fixed with the wire feeding support and the rocker. The outer end of the rocker is provided with a second yarn guide ring.

The detection assembly comprises a non-silk detection piece and a silk outlet delay detection piece. The wireless detection piece comprises four annular Hall sensors. The detection ports of the four annular Hall sensors are coaxially fixed with the first wire guide rings on the four wire guide rods. The wire outlet hysteresis detection piece comprises a detection metal block and two hysteresis Hall sensors; the detection metal block is fixed on the rocker; the two hysteresis Hall sensors are both fixed in the wire outlet shell; the distances from the detection metal block and the two lag Hall sensors to the rocker and the hinge shaft of the wire outlet shell are equal. The two lag Hall sensors form an angle of 120 degrees with the connecting line of the rocker and the hinge shaft of the wire outlet shell. And under the state that the outer end of the rocker is not stressed, the detection metal block approaches one of the hysteresis Hall sensors. The other hysteresis hall sensor is located on the side of the rocker near the straightening assembly.

Furthermore, two material blocking spring pieces are arranged on the end face of the outlet end of the discharging block in a centering manner. The distance between the two material blocking spring pieces is smaller than the width of the discharge chute.

Furthermore, the rotary material moving mechanism further comprises a contact piece, a starting point limit sensor and an end point limit sensor. The starting point limit sensor and the end point limit sensor both adopt photoelectric sensors and are fixed on the material moving frame. The top of the material moving plate is fixed with one end of the contact piece.

The distance between a laser emitting head of an emitter of the optical fiber laser correlation sensor and the axis of the upper clamping pipe is equal to the distance between the axis of the wire penetrating hole in the double-hole crystal octagonal bead and the central axis of the double-hole crystal octagonal bead.

Further, when the upper clamping tube and the lower clamping tube are located at the end limit positions, the double-hole crystal octagonal bead between the upper clamping tube and the lower clamping tube is located on the rotation track of the upper jaw body of the pneumatic clamping jaw. The crystal bead clamp at the feeding station is positioned on the rotation track of the claw body on the pneumatic clamping jaw.

Furthermore, the first mounting groove is a through groove, and the cross section of the first mounting groove is square. Four mounting holes which are uniformly distributed along the circumferential direction of the axis of the outer mounting disc are formed in the side face of the outer mounting disc. The bottom of four mounting holes communicates respectively with four first mounting grooves. Four bayonet lock chutes which are uniformly distributed along the circumferential direction of the axis of the inner mounting column are arranged on the side surface of the inner mounting column. The bottom ends of the four bayonet lock sliding grooves are respectively communicated with the four second mounting grooves. Four limiting sliding grooves are formed in the side face of the rotary drum and are circumferentially and uniformly distributed along the axis of the rotary drum. The four limiting sliding grooves and the four clamping pin sliding grooves respectively correspond to each other along the circumferential direction of the rotary drum.

And the outer side surface of the movable clamping block is provided with an inserting rod hole. The outer side surface of the fixed clamping block is provided with a threaded hole. The working side surfaces of the sliding rails in the four crystal bead clamps face the direction departing from the axis of the central rotating shaft. The four end bolts respectively penetrate through the four mounting holes in the outer mounting disc and are respectively in threaded connection with threaded holes of the clamping blocks in the four crystal bead clamps. The inner ends of the clamping pins of the four crystal bead clamps respectively penetrate through the four clamping pin chutes and extend into the corresponding insertion rod holes. The outer ends of the clamping pins of the four crystal bead clamps extend out of the four limiting sliding grooves respectively. The middle part of the clamping pin is provided with an annular bulge. The annular projection of the capture pin is located between the drum and the inner mounting post.

The two side edges of the end faces of the opposite ends of the movable clamping block and the fixed clamping block are provided with locking bead blocks. The edges, which are adjacent to each other, on the side surfaces, far away from the movable clamping block, of the two locking bead blocks on the movable clamping block are provided with locking bead grooves. The edges, which are adjacent to each other, of the two locking bead blocks on the fixed clamping block, far away from the side surface of the fixed clamping block are provided with locking bead grooves.

Furthermore, the first shifting plate and the second shifting plate are both positioned on one side of the four clamping pins close to the outer mounting plate.

Furthermore, when the looping cutter is positioned at the lower extreme point, the end of the wire guide hole on the second wire guide frame, which is far away from the first wire guide frame, is opposite to the inlet end of the first looping groove. And under the state that the looping cutter is positioned at the upper extreme point, the end of the wire guide hole on the second wire guide frame, which is far away from the first wire guide frame, is lower than the inlet end of the first looping groove.

Furthermore, the looper driving piece comprises a first transmission shaft, a second transmission shaft, a wire feeding motor, a first belt wheel, a second belt wheel, a first gear and a second gear. The first transmission shaft and the second transmission shaft are both supported on the looper frame. The wire feeding motor is fixed on the looping frame. One end of the first transmission shaft is fixed with the first gear, and the other end of the first transmission shaft is fixed with the first grinding wheel. One end of the second transmission shaft is fixed with the second gear and the second belt wheel, and the other end of the second transmission shaft is fixed with the second grinding wheel. The second gear is engaged with the first gear. An output shaft of the wire feeding motor is fixed with the first belt pulley. The first belt wheel is connected with the second belt wheel through a first transmission belt.

The cutting driving piece comprises a third transmission shaft, a cutting motor, a third belt wheel and a fourth belt wheel. The third transmission shaft is supported on the looping frame. The cutting motor is fixed on the looping frame. One end of the third transmission shaft is fixed with the fourth belt pulley, and the other end of the third transmission shaft is fixed with the cam. The output shaft of the cutting motor is fixed with the third belt wheel. The third belt wheel is connected with the fourth belt wheel through a second transmission belt.

Further, the characteristic spiral line is a cylindrical spiral line. The diameters of the wire guiding holes on the first wire guiding frame and the second wire guiding frame, the distance between the first rolling wheel and the second rolling wheel and the lead of the characteristic spiral line are equal. The crystal bead clamps at the first threading station and the second threading station all clamp double-hole crystal octagonal beads, and two threading holes of the double-hole crystal octagonal beads are respectively positioned in states corresponding to two sides of the crystal bead clamp, so that a characteristic circle can pass through the threading holes on the crystal bead clamps at the first threading station and the second threading station, wherein the two threading holes are close to each other. The diameter of the characteristic circle is equal to that of the characteristic spiral line, and the circle center is on the central axis of the characteristic spiral line. The characteristic circle is intersected with the first looping groove or the second looping groove.

The invention has the beneficial effects that:

1. the invention can realize the one-by-one continuous series connection of the double-hole crystal octagonal beads and realize the high automation of the series connection of the double-hole crystal octagonal beads.

2. The four-station clamping mechanism can synchronously carry out feeding, beading and blanking.

3. The rotary material moving mechanism can detect and adjust the spatial pose of the double-hole crystal octagonal bead without manually screening materials.

4. The double-hole crystal octagonal bead conveying mechanism can arrange and convey double-hole crystal octagonal beads to the rotary material moving mechanism one by one.

5. The wire feeding mechanism can detect whether an iron wire exists or not and whether the wire is discharged or not.

Drawings

FIG. 1 is a schematic view of the overall structure of a bead stringing apparatus according to the present invention;

FIG. 2 is a perspective view of a vibratory plate discharge mechanism in a bead stringing apparatus according to the present invention;

FIG. 3 is a perspective view of a discharge block in a bead apparatus used in the present invention;

FIG. 4 is a perspective view of a rotary material moving mechanism in a beading apparatus employed in the present invention;

FIG. 5 is a perspective view of a material moving robot arm in a bead stringing apparatus according to the present invention;

FIG. 6 is a perspective view of a four-station clamping mechanism in a bead stringing apparatus according to the present invention;

FIG. 7 is a perspective view of a spindle assembly of a bead apparatus in accordance with the present invention;

FIG. 8 is a perspective view of a crystal bead holder in a bead stringing apparatus according to the present invention;

FIG. 9 is a schematic view of the assembly of the station change drive assembly and the bead clamping drive assembly in the bead stringing apparatus according to the present invention;

FIG. 10 is a perspective view of a wire winding and looping mechanism in a bead stringing apparatus according to the present invention;

FIG. 11 is a perspective view of a straightening assembly in a beading apparatus used in the present invention;

FIG. 12 is a perspective view of a looping and severing assembly of the bead apparatus utilized in the present invention;

FIG. 13 is a perspective view of a looping cut-off drive assembly in a beading apparatus utilized in the present invention;

fig. 14 is a perspective view of a wire feeder in a beading apparatus employed in the present invention.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1, 2 and 3, a bead stringing device adopted by a full-automatic crystal bead stringing method comprises a bottom plate 1, a vibrating disc discharging mechanism 2, a rotary material moving mechanism 3, a material moving mechanical arm 4, a four-station clamping mechanism 5, a wire winding and looping mechanism 6 and a wire feeding mechanism. The vibrating disc discharging mechanism 2 comprises a vibrating disc 2-1, a linear vibrator, a conveying rail bar 2-2, a discharging block 2-3, a material blocking block 2-5 and a material blocking spring. A plurality of double-hole crystal octagonal beads to be threaded are placed in the vibration disk 2-1. The vibrating disk 2-1 is fixed on the bottom plate 1. The conveying rail 2-2 is fixed with the vibration disk 2-1. The top surface of the conveying rail bar 2-2 is provided with a conveying chute. The groove width of the conveying chute is equal to the distance between two opposite edges of the double-hole crystal octagonal bead. The conveying chute is not communicated with the bottom surface of the conveying rail bar 2-2. A rectilinear vibration device is fixed on the bottom surface of the conveying rail bar 2-2. The inlet end of the conveying chute is communicated with the discharge hole of the vibrating disk 2-1. The inlet end of the discharging block 2-3 is fixed with the outlet end of the conveying chute. The top surface of the discharging block 2-3 is provided with a discharging groove. The outlet end of the conveying chute on the conveying rail bar 2-2 is communicated with the inlet end of the discharging chute on the discharging block 2-3. The cross section of the discharge chute is the same as that of the conveying chute. The outlet end of the bottom surface of the discharging groove is provided with a yielding through groove 2-4. The abdicating through groove 2-4 is communicated with the end face of the outlet end of the discharging block 2-3. Two material blocking blocks 2-5 are arranged at the outlet end of the material discharging block 2-3 in a centering way. The middle part of the material blocking block 2-5 is hinged with the material discharging block 2-3. One end of each of the two material blocking springs is fixed with one end of each of the two material blocking blocks 2-5, and the other end of each of the two material blocking springs is fixed with the discharging block. The distance between the two material blocking blocks 2-5 is smaller than the groove width of the discharge chute, so that the material blocking blocks 2-5 can block the double-hole crystal octagonal bead on the discharge chute, and the double-hole crystal octagonal bead cannot slide out and fall under the action of the vertical vibrator.

As shown in figures 1 and 4, the rotary material moving mechanism 3 comprises a material moving frame 3-1, a material moving motor, a synchronous belt 3-3, a tensioning block, a tensioning shaft, a synchronous belt wheel 3-4, a material moving plate 3-5, a sliding table cylinder 3-6, an upper support seat 3-7, a lower support seat 3-8, an upper clamping tube 3-9, a lower clamping tube 3-10, an optical fiber laser correlation sensor 3-11, a contact piece, a starting point limit sensor 3-12, an end point limit sensor 3-13 and a rotary position motor 3-2. Photoelectric sensors are adopted for the starting point limit sensors 3-12 and the end point limit sensors 3-13. The starting point limit sensor 3-12 and the end point limit sensor 3-13 which are arranged at equal height are both fixed on the material moving frame 3-1. The material moving frame 3-1 is fixed on the bottom plate 1. The tensioning block and the material moving frame form a sliding pair and are fixed through a set screw. The tensioning shaft is fixed on the tensioning block. The material moving motor is fixed on the material moving frame, and an output shaft of the material moving motor is coaxially fixed with a synchronous belt wheel. The other synchronous pulley 3-4 is supported on the tensioning shaft. The two synchronous pulleys 3-4 are connected through a synchronous belt. The tensioning of the synchronous belt 3-3 can be realized by adjusting the position of the tensioning block. The material moving plate 3-5 and the material moving frame 3-1 form a sliding pair and are fixed with the synchronous belt 3-3.

The top of the material moving plate 3-5 is fixed with one end of the contact piece. And under the condition that the material moving plate 3-5 moves to the starting point limit position, the other end of the contact piece is close to the starting point limit sensor 3-12. And under the condition that the material moving plate 3-5 moves to the end limit position, the other end of the contact piece is close to the end limit sensor 3-13. The contact piece is aligned with the starting point limit sensor 3-12 and the end point limit sensor 3-13 in the vertical direction.

The model of the sliding table air cylinder 3-6 is MHF 2-16D. The sliding table cylinder 3-6 is fixed with the material moving plate 3-5. The upper support seat 3-7 and the lower support seat 3-8 are respectively fixed with the two slide blocks of the sliding table cylinder 3-6. The top end of the upper clamping tube 3-9 and the upper supporting seat 3-7 form a revolute pair. The rotary motor 3-2 is fixed with the lower support base 3-8. An output shaft of the rotary motor 3-2 is fixed with the bottom end of the lower clamping pipe 3-10. The upper clamping pipe 3-9 and the lower clamping pipe 3-10 are coaxially arranged.

The emitter and the receiver of the optical fiber laser correlation sensor 3-11 are respectively fixed on the upper supporting seat 3-7 and the lower supporting seat 3-8. The emitters and receivers of the fiber laser correlation sensors 3-11 are arranged up and down. The distance between the laser emitting head of the emitter of the fiber laser correlation sensor 3-11 and the axis of the upper clamping tube 3-9 is equal to the distance between the axis of the wire through hole on the double-hole crystal octagonal bead and the central axis of the double-hole crystal octagonal bead. The two sliding table cylinders 3-6 are respectively used for driving the upper supporting seats 3-7 and the lower supporting seats 3-8 to slide in the opposite direction or in the opposite direction, so that the upper clamping tubes 3-9 and the lower clamping tubes 3-10 clamp the double-hole crystal octagonal beads at the outlet end of the conveying track. The rotary motor 3-2 is used for driving the double-hole crystal octagonal bead to rotate around the axis of the double-hole crystal octagonal bead. If the receiver of the fiber laser correlation sensor 3-11 detects the infrared light emitted by the emitter, the wire passing hole on the double-hole crystal octagonal bead reaches between the receiver of the fiber laser correlation sensor 3-11 and the emitter, and the double-hole crystal octagonal bead is regarded as reaching the preset spatial pose. Therefore, each double-hole crystal octagonal bead can be conveyed to the material-moving mechanical arm 4 in the same spatial pose.

As shown in figures 1 and 5, the material transferring mechanical arm 4 comprises a lifting motor 4-1, a lifting wheel 4-2, a lifting wheel disc 4-3, a square shaft 4-4, a sliding seat 4-5, a lifting seat 4-6, a transfer motor 4-7 and a pneumatic clamping jaw 4-8. The sliding seat 4-5 and the lifting motor 4-1 are fixed on the material moving frame 3-1 through a connecting plate. The output shaft of the lifting motor 4-1 is horizontally arranged and eccentrically fixed with the lifting wheel 4-2. The cross section of the lifting wheel 4-2 is round. The sliding seats 4-5 are provided with square holes with central axes vertically arranged. The square shaft 4-4 and the square hole on the sliding seat 4-5 form a sliding pair. The two lifting gear wheels 4-3 are both fixed on the square shaft 4-4. The lifting gear wheel disc 4-3 is provided with a lifting plate. The lifting wheel 4-2 is positioned between the lifting shifting plates in the two lifting gear wheel discs 4-3. And the diameter of the lifting wheel 4-2 is equal to the distance between the two lifting plates. Because the output shaft of the lifting motor 4-1 is eccentrically arranged with the lifting wheel 4-2, when the lifting motor 4-1 drives the lifting wheel 4-2 to rotate, the two lifting gear wheel discs 4-3 drive the square shaft 4-4 to slide up and down. The lifting seat 4-6 is fixed with the bottom end of the square shaft 4-4. The transfer motor 4-7 is fixed on the lifting seat 4-6. The output shaft of the transfer motor 4-7 is vertically arranged and fixed with the pneumatic clamping jaw 4-8.

When the upper clamping pipe and the lower clamping pipe are positioned at the terminal limit positions, the double-hole crystal octagonal bead between the upper clamping pipe and the lower clamping pipe is positioned on the rotating track of the upper jaw body of the pneumatic clamping jaw 4-8.

As shown in fig. 1, 6 and 7, the four-station clamping mechanism 5 comprises a rotating shaft assembly 7, a station conversion driving assembly 8, a bead clamping driving assembly 9 and a clamping frame 10. The clamping frame 10 is fixed with a looping frame in the wire winding looping mechanism. The rotating shaft assembly 7 comprises a central rotating shaft 7-1, a rotating drum 7-2, an inner mounting column 7-3, an outer mounting disc 7-4 and a crystal bead clamp 7-5. The inner end of the central rotating shaft 7-1 is supported on the clamping frame 10, the middle part of the central rotating shaft is fixed with the inner mounting column 7-3, and the outer end of the central rotating shaft is fixed with the outer mounting disc 7-4. Four first mounting grooves which are uniformly distributed along the circumferential direction of the axis of the inner mounting column 7-3 are formed in the end face of the outer end of the inner mounting column 7-3. The first mounting groove is a through groove, and the cross section of the first mounting groove is square. The rotary drum 7-2 is sleeved outside the inner mounting column 7-3 and fixed with the inner mounting column 7-3.

Four second mounting grooves which are uniformly distributed along the circumferential direction of the axis of the outer mounting disc 7-4 are formed in the end face of the outer end of the outer mounting disc 7-4. The cross section of the second mounting groove is identical to that of the first mounting groove. The four first mounting grooves correspond to the four second mounting grooves in position respectively. Four mounting holes which are uniformly distributed along the circumferential direction of the axis of the outer mounting disc 7-4 are formed in the side surface of the outer mounting disc. The bottom of four mounting holes communicates respectively with four first mounting grooves. Four bayonet pin sliding grooves which are uniformly distributed along the circumferential direction of the axis of the inner mounting column 7-3 are formed in the side surface of the inner mounting column. The bottom ends of the four bayonet lock sliding grooves are respectively communicated with the four second mounting grooves. Four limiting sliding grooves which are uniformly distributed along the circumferential direction of the axis of the rotating drum 7-2 are formed in the side surface of the rotating drum. The four limiting sliding grooves correspond to the four bayonet pin sliding grooves in position respectively.

As shown in figures 1, 6, 7 and 8, the crystal bead clamp 7-5 comprises a slide rail 7-5-1, a fixed clamping block 7-5-2, a movable clamping block 7-5-3, a bead clamping spring and a clamping pin 7-5-4. The inner end of the working side surface of the slide rail 7-5-1 is provided with a limiting bulge, and the outer end of the slide rail is fixed with the fixed clamping block 7-5-2. The movable clamping block 7-5-3 and the middle part of the working side surface of the sliding rail 7-5-1 form a sliding pair. Two ends of the ball clamping spring are respectively fixed with the limiting bulge and the end surface of the opposite end of the movable clamping block 7-5-3. The two side edges of the end faces of the opposite ends of the movable clamping block 7-5-3 and the fixed clamping block 7-5-2 are provided with locking bead blocks. The edges of the two locking bead blocks on the movable clamping block 7-5-3, which are far away from the movable clamping block 7-5-3 and are adjacent to each other, are provided with locking bead grooves. The edges of the two locking bead blocks on the fixed clamping block 7-5-2, which are far away from the fixed clamping block 7-5-2 and are adjacent to each other, are provided with locking bead grooves. The outer side surface of the fixed clamping block 7-5-2 is provided with a threaded hole. The outer side surface of the movable clamping block 7-5-3 is provided with a jack rod hole. The cross section of the crystal bead clamp 7-5 after the clamping pin 7-5-4 is removed is completely the same as that of the first mounting groove.

The number of the crystal bead clamps 7-5 is four. The four crystal bead clamps 7-5 respectively extend into the four first mounting grooves and the four second mounting grooves. The working side surfaces of the sliding rails 7-5-1 in the four crystal bead clamps 7-5 face the direction departing from the axis of the central rotating shaft 7-1. The four end bolts respectively pass through the four mounting holes on the outer mounting disc 7-4 and are respectively in threaded connection with threaded holes of the inner fixed clamping blocks 7-5-2 of the four crystal bead clamps 7-5. The inner ends of the clamping pins 7-5-4 of the four crystal bead clamps 7-5 respectively penetrate through the four clamping pin chutes and extend into the corresponding insertion rod holes. The outer ends of the clamping pins 7-5-4 of the four crystal bead clamps 7-5 respectively extend out of the four limiting sliding grooves. The middle part of the position clamping pin 7-5-4 is provided with an annular bulge. The annular projection of the capture pin 7-5-4 is located between the drum 7-2 and the inner mounting post 7-3.

As shown in fig. 1, 6 and 9, the station changing drive assembly 8 includes a station changing motor 8-1, a code wheel 8-2 and a station detection sensor 8-3. The station detection sensor 8-3 adopts a diffuse reflection type photoelectric sensor. The station conversion motor 8-1 is a motor with double output shafts. The station conversion motor 8-1 is fixed with the clamping frame 10. One output shaft of the station switching motor 8-1 is fixed with the inner end of the central rotating shaft 7-1, so that the station switching motor 8-1 can drive the central rotating shaft 7-1 to rotate. The other output shaft of the station conversion motor 8-1 is fixed with the coding disc 8-2. Four detection holes are uniformly distributed along the circumferential direction of the axis of the coding disc 8-2. The station detection sensor 8-3 is fixed with the clamping frame 10. The detection head of the station detection sensor 8-3 is arranged towards the coding disc 8-2, and the distance from the axis of the coding disc 8-2 is equal to the distance from the axis of the detection hole to the axis of the coding disc 8-2. And when the station detection sensor 8-3 changes from detecting no detection hole to detecting the detection hole, the station switching is considered to be completed once.

The ball clamping driving assembly 9 comprises a first air cylinder 9-1, a second air cylinder 9-4, a first shifting plate 9-2 and a second shifting plate 9-3. The first cylinder 9-1 and the second cylinder 9-4 are both fixed with the clamping frame 10. The push-out rods of the first cylinder 9-1 and the second cylinder 9-4 are respectively fixed with the first shifting plate 9-2 and the second shifting plate 9-3. The first dial plate 9-2 is positioned right above the rotating shaft assembly 7. The second dial plate 9-3 is positioned at one side of the rotating shaft component 7. The distance from the first shifting plate 9-2 and the second shifting plate 9-3 to the axis of the central rotating shaft 7-1 is less than the distance from the end surface of the outer end of the clamping pin 7-5-4 to the axis of the central rotating shaft 7-1. The first shifting plate 9-2 and the second shifting plate 9-3 are both positioned on one side of the four clamping pins 7-5-4 close to the outer mounting plate 7-4. The crystal bead clamp 7-5 positioned right above and the clamping pin 7-5-4 in the crystal bead clamp 7-5 corresponding to the second shifting plate 9-3 can be pushed to move by the extension of the first air cylinder 9-1 and the second air cylinder 9-4, so that the sliding of the movable clamping block 7-5-3 is realized.

The four crystal bead clamps 7-5 correspond to four stations. The four stations are respectively a feeding station, a first wire threading station, a second wire threading station and a discharging station which are sequentially arranged in a ring shape along the circumferential direction of the central rotating shaft 7-1. The working side surface of the slide rail 7-5-1 in the crystal bead clamp 7-5 at the feeding station faces to the right upper side. The feeding station corresponds to the first shifting plate 9-2. The blanking station corresponds to the position of the second shifting plate 9-3. The crystal bead clamp 7-5 at the feeding station is positioned on the rotation track of the upper jaw body of the pneumatic clamping jaw 4-8.

As shown in fig. 1, 10 and 11, the wire-winding looping mechanism 6 includes a looping and cutting assembly 11, a straightening assembly 12, a looping frame 13, and a looping and cutting drive assembly 14. The looper 13 is fixed on the bottom plate. The straightening assembly 12 comprises an adjusting bolt 12-1, an adjusting slide block 12-2, a U-shaped bearing 12-3 and a straightening frame 12-4. Seven adjusting slide blocks 12-2 which are sequentially arranged along the length direction of the straight grinding frame 12-4 are arranged on the straight grinding frame 12-4. All the adjusting slide blocks 12-2 and the straight grinding frame 12-4 form a sliding pair which slides along the width direction of the straight grinding frame 12-4. Seven adjusting bolt groups are arranged on the vertical rolling frame 12-4. The adjusting bolt group consists of two adjusting bolts 12-1. The seven adjusting bolt 12-1 groups correspond to the seven adjusting sliding blocks 12-2 one by one. Two adjusting bolts 12-1 in the same adjusting bolt 12-1 group are respectively positioned at two sides of the vertical rolling frame 12-4 and respectively abut against two ends of the corresponding adjusting slide block 12-2. U-shaped bearings 12-3 are supported on the seven adjusting sliders 12-2. Seven adjusting slide blocks 12-2 are sequentially sequenced along the length direction of the straight grinding frame 12-4. The adjustment slide block 12-2 with the odd number is the first adjustment slide block. The adjustment slide block 12-2 with even number is the second adjustment slide block. The U-shaped bearings 12-3 on all the first adjustment blocks are aligned in the width direction of the straightening frame 12-4. The U-shaped bearings 12-3 on all the second adjusting sliders are aligned in the width direction of the straightening frame 12-4. The U-shaped bearing 12-3 on the first adjusting slide block and the U-shaped bearing 12-3 on the second adjusting slide block are arranged in a staggered mode in the width direction of the straight grinding frame 12-4.

The position of the adjusting slide block 12-2 can be adjusted by rotating two adjusting bolts 12-1 in the same adjusting bolt 12-1 group, so that the staggering degree of the U-shaped bearing 12-3 on the first adjusting slide block and the U-shaped bearing 12-3 on the second adjusting slide block is adjusted, and the clamping degree of the U-shaped bearing 12-3 to the iron wire is changed.

As shown in fig. 1, 10 and 12, there are two straightening assemblies. The axes of the U-shaped bearings 12-3 in the two straightening assemblies are perpendicular to each other. The rolling target lines of the two rolling assemblies are overlapped. The rolling target line of the straightening component is the intersection line of the transverse rolling target surface and the longitudinal rolling target surface. The transverse rolling target surface is a symmetrical surface of two end surfaces of the U-shaped bearing 12-3 in the straightening component. The longitudinal rolling target surface is a plane with equal distance to the axes of all U-shaped bearings 12-3 in the straightening assembly.

The looping and cutting assembly 11 comprises an adjusting bolt, a pressing spring, an adjusting block, a first rolling wheel 11-1, a second rolling wheel 11-2, a cutting cam 11-3, a cutting rocker arm 11-4, a cutter mounting block 11-5, a looping cutter 11-6, a return spring, a first yarn guide frame 11-7 and a second yarn guide frame 11-8. The second grinding wheel 11-2 is supported on the looper frame 13. The adjusting block and the looping frame form a sliding pair. The adjusting bolt is in threaded connection with the looping frame. Two ends of the compression spring are respectively fixed with the adjusting block and the adjusting bolt. The adjusting bolt is positioned right above the adjusting block. The first grinding wheel 11-1 is supported on the adjusting block. The first roller 11-1 is positioned right above the second roller 11-2. By rotating the adjusting bolt, the distance between the adjusting bolt and the adjusting block can be changed, so that the pressure of the compression spring on the first grinding wheel is changed, and the force of the first grinding wheel 11-1 and the second grinding wheel 11-2 for extruding the iron wires is changed. The rotation of the first rolling wheel 11-1 and the second rolling wheel 11-2 drives the iron wires to be looped to be conveyed to the looping knife 11-6.

The first godet frame 11-7 and the second godet frame 11-8 are fixed on the looping frame 13, and opposite ends are respectively close to a gap between the first rolling wheel 11-1 and the second rolling wheel 11-2. The first yarn guide frame 11-7 and the second yarn guide frame 11-8 are both provided with yarn guide holes. The axes of the yarn guide holes in the first yarn guide frame 11-7 and the second yarn guide frame 11-8 are superposed with the rolling target lines of the two straightening assemblies.

The cutter mounting block 11-5 and the looper frame 13 form a sliding pair which slides along the vertical direction. Two ends of the return spring are respectively fixed with the cutter mounting block 11-5 and the looper frame 13. The looper knife 11-6 is fixed on the top of the knife mounting block 11-5. The looping knife 11-6 is provided with a first looping groove and a second looping groove. The first looping groove and the second looping groove are arc-shaped and are abutted together. The central lines of the first looping groove and the second looping groove are on the same characteristic spiral line. The spiral line is characterized by being a cylindrical spiral line with the lead equal to the diameter of the iron wire to be looped and the diameter equal to the diameter of the iron wire to be looped.

The cutting cam 11-3 is supported on the looper frame 13. The middle part of the cutting rocker arm 11-4 and the looper frame 13 form a rotating pair. One end of the cutting rocker arm 11-4 is fixed with a round mounting block, and the other end of the cutting rocker arm props against the bottom of the cutter mounting block 11-5. The circular mounting block is in contact with the side of the cutting cam 11-3. The looper knife 11-6 can be driven to slide up and down by the rotation of the cutting cam 11-3. When the looping knife 11-6 is positioned at the lower extreme point, the end of the wire guide hole on the second wire guide frame 11-8 far away from the first wire guide frame 11-7 is opposite to the inlet end of the first looping groove. When the looping knife 11-6 is located at the upper extreme point, the end of the wire hole of the second wire guide frame 11-8 far away from the first wire guide frame 11-7 is lower than the inlet end of the first looping groove. When the cutting cam 11-3 pushes the circular mounting block to move away from the rotation axis of the cutting cam 11-3, the cutting rocker arm 11-4 pushes the cutter mounting block 11-5 to slide upwards, so that the inlet of the looping cutter 11-6 cuts the iron wire.

As shown in fig. 1, 10 and 13, the looper cut-off drive assembly 14 includes a first drive shaft, a second drive shaft, a third drive shaft, a wire feed motor 14-4, a cut-off motor 14-5, a first pulley 14-6, a second pulley 14-7, a third pulley 14-8, a fourth pulley 14-3, a first gear 14-1 and a second gear 14-2. The first transmission shaft, the second transmission shaft and the third transmission shaft are all supported in the looper frame 13. The wire feeding motor 14-4 and the cutting motor 14-5 are both fixed in the looping frame 13. One end of the first transmission shaft is fixed with the first gear 14-1, and the other end is fixed with the first grinding wheel 11-1. One end of the second transmission shaft is fixed with the second gear 14-2 and the second belt wheel 14-7, and the other end is fixed with the second grinding wheel 11-2. The second gear 14-2 meshes with the first gear 14-1. One end of the third transmission shaft is fixed with the fourth belt wheel 14-3, and the other end is fixed with the cam. The output shaft of the wire feeding motor 14-4 is fixed with the first belt wheel 14-6. The first pulley 14-6 is connected to the second pulley 14-7 via a first drive belt. The output shaft of the cut-off motor 14-5 is fixed to the third pulley 14-8. The third belt pulley 14-8 is connected with the fourth belt pulley 14-3 through a second transmission belt.

The crystal bead clamps 7-5 at the first threading station and the second threading station clamp the double-hole crystal octagonal bead, and under the condition that two threading holes of the double-hole crystal octagonal bead are respectively positioned at two sides of the corresponding crystal bead clamps 7-5, a characteristic circle simultaneously passes through the threading holes at which the double-hole crystal octagonal beads on the crystal bead clamps 7-5 at the first threading station and the second threading station are adjacent to each other. The diameter of the characteristic circle is equal to that of the characteristic spiral line, and the circle center is on the central axis of the characteristic spiral line. The characteristic circle is intersected with the first looping groove or the second looping groove. Therefore, the iron wire ring processed by the looping knife 11-6 directly passes through the threading holes on the two double-hole crystal octagonal beads, so that the two double-hole crystal octagonal beads are connected.

As shown in figures 1 and 14, the wire feeding mechanism comprises a wire discharging motor 15-1, a wire feeding disc 15-2, a wire feeding bracket 15-3, a wire loading rod 15-4, an outer guide post 15-5, an outer guide sleeve 15-6, a wire guide rod 15-7, a wire discharging assembly 15-8 and a detection assembly. The wire feeding bracket 15-3 is fixed with the bottom plate 1. The wire feeding disc 15-2 is supported on the wire feeding support 15-3. The wire outlet motor 15-1 is fixed on the wire feeding bracket 15-3. The output shaft of the wire outlet motor 15-1 is coaxially arranged with the wire feeding disc 15-2. Four adjusting grooves arranged along the radial direction of the wire feeding disc are formed in the wire feeding disc, and the bottom ends of four wire loading rods 15-4 uniformly distributed along the circumferential direction of the wire feeding disc 15-2 are fixed with the top surface of the wire feeding disc 15-2. The bottom ends of four outer guide posts 15-5 uniformly distributed along the circumferential direction of the wire feeding disc 15-2 are respectively fixed in four adjusting grooves of the wire feeding support 15-3. The four outer guide sleeves 15-6 and the four outer guide posts 15-5 respectively form sliding pairs and are fixed through set screws respectively. The four outer guide sleeves 15-6 are respectively fixed with the bottom ends of the four wire guide rods 15-7. The top ends of the four wire guide rods 15-7 are provided with first wire guide rings. The first yarn guiding rings of the four yarn guiding rods 15-7 are sequentially heightened along the circumferential direction of the yarn feeding disc 15-2. The thread take-off assembly 15-8 is located between the uppermost thread guide rod 15-7 and the lowermost thread guide rod 15-7. The wire outlet assembly 15-8 comprises a wire outlet shell, a rocker and a wire outlet spring. The wire outlet shell is fixed with the wire feeding bracket 15-3. The inner end of the rocker is hinged with the wire outlet shell. Two ends of the wire outlet spring are respectively fixed with the wire feeding support 15-3 and the rocker. The outer end of the rocker is provided with a second yarn guide ring.

The detection assembly comprises a non-silk detection piece and a silk outlet delay detection piece. The wireless detection piece comprises four annular Hall sensors. The detection ports of the four annular Hall sensors are coaxially fixed with the first wire guide rings on the four wire guide rods. The iron wire passes through the detection port of the annular Hall sensor, and the annular Hall sensor can output signals when no wire or broken wires exist. The wire outlet hysteresis detection piece comprises a detection metal block and two hysteresis Hall sensors; the detection metal block is fixed on the rocker; the two hysteresis Hall sensors are both fixed in the wire outlet shell; the distances from the detection metal block and the two lag Hall sensors to the rocker and the hinge shaft of the wire outlet shell are equal. The connecting line of the two lagging Hall sensors to the rocker and the hinge shaft of the wire outlet shell forms an angle of 120 degrees. And under the state that the outer end of the rocker is not stressed, the detection metal block approaches one of the hysteresis Hall sensors. The other hysteresis hall sensor is located on the side of the rocker near the straightening assembly. When the wire is discharged and lagged, the rocker is stressed to rotate, and the detection metal block is driven to deflect from one lagging Hall sensor to the other lagging Hall sensor to output signals; when the wire is not delayed any more, the rocker is reset under the action of the spring, so that the metal block deflects to delay the original position of the Hall sensor.

The full-automatic bead stringing method comprises a pre-preparation method, a feeding method, a material transferring method and a wire threading method.

The preparation method comprises the following specific steps:

a plurality of double-hole crystal octagonal beads are loaded into the vibration disk 2-1. The processing end of an iron wire passes through a first wire guide ring on four wire guide rods 15-7, a second wire guide ring on a rocker, a U-shaped bearing 12-3 on a first adjusting slide block and a U-shaped bearing 12-3 on a second adjusting slide block in two straightening assemblies 12, passes through wire guide holes on a first wire guide frame 11-7 and a second wire guide frame 11-8, is pressed by a first rolling wheel and a second rolling wheel and then abuts against the inlet end of a first coiling groove on a coiling knife 11-6.

The feeding method comprises the following specific steps:

step one, the vibration disk 2-1 and the straight vibration device are started. The double-hole crystal octagonal beads enter the conveying rail bar 2-2 and the discharging block 2-3 one by one under the driving of the vibrating disc 2-1. The double-hole crystal octagonal bead which is positioned at the position farthest away from the vibration disk reaches between the upper clamping tube 3-9 and the lower clamping tube 3-10,

and step two, starting the sliding table cylinder 3-6 to enable the upper clamping pipe 3-9 and the lower clamping pipe 3-10 to slide oppositely to clamp the double-hole crystal octagonal bead.

And step three, the material moving motor rotates forwards to enable the material moving plates 3-5 to slide towards the material moving mechanical arm 4. The clamped double-hole crystal octagonal bead pushes the two material blocking blocks 2-5 to rotate on the material moving plate. The clamped double-hole crystal octagonal bead leaves the discharge chute.

In the sliding process of the material moving plate 3-5, if the receiver of the optical fiber laser correlation sensor 3-11 cannot detect the light emitted by the emitter, the rotary motor 3-2 rotates until the receiver of the optical fiber laser correlation sensor 3-11 detects the light emitted by the emitter. At the moment, the double-hole crystal octagonal bead between the upper clamping tube 3-9 and the lower clamping tube 3-10 reaches a preset spatial pose.

And step four, stopping the material moving motor after the end point limit sensors 3-13 detect the contact pieces on the material moving plates 3-5. If the pneumatic clamping jaws 4-8 are not in the initial position, the upper clamping tube 3-9 and the lower clamping tube 3-10 are kept still, and the pneumatic clamping jaws 4-8 are waited to reach the initial position. If the pneumatic clamping jaws 4-8 are located at the initial positions, the material moving motor rotates, so that the double-hole crystal octagonal bead between the upper clamping tube 3-9 and the lower clamping tube 3-10 reaches the clamping range of the pneumatic clamping jaws 4-8, and the pneumatic clamping jaws 4-8 clamp two opposite sides of the double-hole crystal octagonal bead. The sliding table cylinder 3-6 drives the upper clamping tube 3-9 and the lower clamping tube 3-10 to slide back to each other, and the double-hole crystal octagonal beads are loosened. And entering the step five.

And step five, reversing the material moving motor to reset the material moving plates 3-5, and repeatedly executing the step two, the step three and the step four.

The material transferring method comprises the following specific steps:

step one, if the double-hole crystal octagonal bead is clamped on the pneumatic clamping jaw 4-8, the transfer motor 4-7 rotates forwards, so that the double-hole crystal octagonal bead on the pneumatic clamping jaw 4-8 reaches the position above a crystal bead clamp 7-5 at a feeding station.

And step two, if the crystal bead clamp 7-5 at the feeding station clamps the double-hole crystal octagonal bead, keeping the pneumatic clamping jaw 4-8 still, and waiting for the crystal bead clamp 7-5 which does not clamp the double-hole crystal octagonal bead to enter the feeding station.

If the crystal bead clamp 7-5 at the feeding station does not clamp the double-hole crystal octagonal bead, the first air cylinder 9-1 of the crystal bead clamp 7-5 at the feeding station retracts, so that the movable clamping block 7-5-3 in the crystal bead clamp 7-5 at the feeding station slides in the direction departing from the fixed clamping block.

And step three, the lifting motor 4-1 rotates forwards to enable the square shaft 4-4 to slide downwards, and the double-hole crystal octagonal bead on the pneumatic clamping jaw 4-8 reaches a position between the movable clamping block 7-5-3 and the fixed clamping block in the crystal bead clamp 7-5 at the feeding station.

And step four, the first air cylinder 9-1 is pushed out, so that the movable clamping block 7-5-3 and the fixed clamping block in the crystal bead clamp 7-5 at the feeding station clamp the double-hole crystal octagonal bead.

And fifthly, loosening the double-hole crystal octagonal bead by the pneumatic clamping jaw 4-8, and reversely rotating the lifting motor 4-1 to enable the square shaft 4-4 to slide upwards for resetting. And entering a sixth step.

And step six, reversing the transfer motor 4-7, resetting the pneumatic clamping jaw 4-8, and repeatedly executing the step one, the step two, the step three, the step four and the step five.

The wire threading method comprises the following specific steps:

step one, if the crystal bead clamp 7-5 at the feeding station does not clamp the double-hole crystal octagonal bead, waiting for the pneumatic clamping jaws 4-8 to load the double-hole crystal octagonal bead into the crystal bead clamp 7-5 at the feeding station.

If the crystal bead clamp 7-5 at the feeding station clamps the double-hole crystal octagonal bead, the station switching motor 8-1 rotates to enable the crystal bead clamp 7-5 at the feeding station to reach the first wire threading station. And then executing the step two.

And step two, if one of the crystal bead clamps 7-5 on the first wire threading station and the crystal bead clamps 7-5 on the second wire threading station does not clamp the double-hole crystal octagonal bead, executing the step one again.

And if the crystal bead clamps 7-5 on the first wire feeding station and the second wire feeding station clamp the double-hole crystal octagonal beads, entering the third step.

And step three, the wire feeding motor 14-4 and the wire discharging motor 15-1 rotate, and the first grinding wheel 11-1 and the second grinding wheel 11-2 drive the processing end of the iron wire to slide on the inlet end of the first looping groove. After being bent in the first looping groove, the iron wire slides out of the outlet end of the first looping groove and penetrates through the wire penetrating holes of the double-hole crystal octagonal beads on the first wire penetrating station and the second wire penetrating station. And after the iron wire is wound into a ring shape, the iron wire slides into the inlet end of the second looping groove.

And step four, after the processing end of the iron wire reaches the outlet end of the second looping groove, stopping the wire feeding motor 14-4 and the wire discharging motor 15-1, and rotating the cutting motor 14-5 to enable the looping knife to slide upwards, so that the iron wire is cut off from the inlet end of the first looping groove. The cut part of the iron wire becomes a new processing end.

And step five, if the crystal bead clamp 7-5 at the feeding station does not clamp the double-hole crystal octagonal bead, waiting for the pneumatic clamping jaws 4-8 to load the double-hole crystal octagonal bead into the crystal bead clamp 7-5 at the feeding station.

If the crystal bead clamp 7-5 at the feeding station clamps the double-hole crystal octagonal bead, the station switching motor 8-1 rotates to enable the crystal bead clamp 7-5 at the second wire threading station to reach the blanking station.

And step six, retracting the second air cylinder to enable the movable clamping block 7-5-3 in the crystal bead clamp 7-5 at the blanking station to slide in the direction departing from the fixed clamping block, and enabling the double-hole crystal octagonal bead clamped by the crystal bead clamp 7-5 at the blanking station to fall off. And entering the step seven.

And seventhly, pushing out by the second cylinder to reset the movable clamping blocks 7-5-3 in the crystal bead clamp 7-5 at the blanking station. And repeatedly executing the steps II, III, IV, V and VI.

Claims

1. A full-automatic crystal bead serial connection method is characterized in that: the adopted bead stringing device comprises a bottom plate, a vibrating disc discharging mechanism, a rotary material moving mechanism, a material moving mechanical arm, a four-station clamping mechanism, a wire winding and looping mechanism and a wire feeding mechanism; the vibrating disc discharging mechanism comprises a vibrating disc, a linear vibrator, a conveying rail bar, a discharging block, a material blocking block and a material blocking spring; the vibrating disk is fixed on the bottom plate; the conveying rail bar is fixed with the vibration disc; the top surface of the conveying rail bar is provided with a conveying chute; the bottom surface of the conveying rail bar is fixed with the straight vibration device; the inlet end of the conveying chute is communicated with the discharge hole of the vibrating disc; the inlet end of the discharging block is fixed with the outlet end of the conveying chute; the top surface of the discharging block is provided with a discharging groove; an outlet end of the bottom surface of the discharging groove is provided with a yielding through groove; the abdicating through groove is communicated with the end face of the outlet end of the discharging block; the two material blocking blocks are arranged at the outlet end of the material discharging block in a centering manner; the distance between the two material blocking blocks is smaller than the width of the discharge chute; one end of each of the two material blocking springs is fixed with one end of each of the two material blocking blocks, and the other end of each of the two material blocking springs is fixed with the discharging block;

the rotary material moving mechanism comprises a material moving frame, a material moving motor, a synchronous belt pulley, a tensioning block, a tensioning shaft, a material moving plate, a sliding table air cylinder, an upper support seat, a lower support seat, an upper clamping pipe, a lower clamping pipe, an optical fiber laser correlation sensor and a rotary position motor; the material moving frame is fixed on the bottom plate; the tensioning block and the material moving frame form a sliding pair and are fixed through a set screw; the tensioning shaft is fixed on the tensioning block; the material moving motor is fixed on the material moving frame, and an output shaft of the material moving motor is coaxially fixed with a synchronous belt pulley; the other synchronous pulley is supported on the tensioning shaft; the two synchronous belt wheels are connected through a synchronous belt; the material moving plate and the material moving frame form a sliding pair and are fixed with the synchronous belt; the sliding table cylinder is fixed with the material moving plate; the upper supporting seat, the lower supporting seat and the two sliding blocks of the sliding table cylinder are respectively fixed; the top end of the upper clamping pipe and the upper support seat form a revolute pair; the rotary motor is fixed with the lower support seat; an output shaft of the rotary motor is fixed with the bottom end of the lower clamping pipe; the upper clamping pipe and the lower clamping pipe are coaxially arranged; the transmitter and the receiver of the optical fiber laser correlation sensor are respectively fixed on the upper supporting seat and the lower supporting seat;

the material moving mechanical arm comprises a lifting motor, a lifting wheel, a lifting gear wheel disc, a square shaft, a sliding seat, a lifting seat, a connecting plate, a transfer motor and a pneumatic clamping jaw; the sliding seat and the lifting motor are fixed on the material moving frame through a connecting plate; an output shaft of the lifting motor is horizontally arranged and is eccentrically fixed with the lifting wheel; the square shaft and the sliding seat form a sliding pair; the two lifting gear wheel discs are fixed on the square shaft; the lifting gear wheel disc is provided with a lifting plate; the lifting wheel is positioned between the lifting plates in the two lifting gear wheel discs; the diameter of the lifting wheel is equal to the distance between the two lifting plates; the lifting seat is fixed with the bottom end of the square shaft; the transfer motor is fixed on the lifting seat; an output shaft of the transfer motor is vertically arranged and fixed with the pneumatic clamping jaw;

the four-station clamping mechanism comprises a rotating shaft assembly, a station conversion driving assembly, a bead clamping driving assembly and a clamping frame; the clamping frame is fixed with a looping frame in the wire winding looping mechanism; the rotating shaft assembly comprises a central rotating shaft, a rotating drum, an inner mounting column, an outer mounting disc and a crystal bead clamp; the inner end of the central rotating shaft is supported on the clamping frame, the middle part of the central rotating shaft is fixed with the inner mounting column, and the outer end of the central rotating shaft is fixed with the outer mounting plate; four first mounting grooves which are uniformly distributed along the circumferential direction of the axis of the inner mounting column are formed in the end surface of the inner mounting column; the rotary drum is sleeved outside the inner mounting column and is fixed with the inner mounting column; four second mounting grooves which are uniformly distributed along the axial direction of the outer mounting disc are formed in the end face of the outer end of the outer mounting disc; the cross section of the second mounting groove is completely the same as that of the first mounting groove; the four first mounting grooves correspond to the four second mounting grooves in position respectively;

the crystal bead clamp comprises a slide rail, a fixed clamping block, a movable clamping block, a bead clamping spring and a clamping pin; the inner end of the working side surface of the slide rail is provided with a limiting bulge, and the outer end of the slide rail is fixed with the fixed clamping block; the movable clamping block and the middle part of the working side surface of the slide rail form a sliding pair; two ends of the ball clamping spring are respectively fixed with the limiting bulge and the end surface of the opposite end of the movable clamping block; the inner end of the clamping pin is fixed with the movable clamping block;

the first mounting groove is a through groove, and the cross section of the first mounting groove is square; four mounting holes are uniformly distributed along the circumferential direction of the axis of the outer mounting disc on the side surface of the outer mounting disc; the bottom ends of the four mounting holes are respectively communicated with the four first mounting grooves; four bayonet lock sliding grooves which are uniformly distributed along the circumferential direction of the axis of the inner mounting column are formed in the side surface of the inner mounting column; the bottom ends of the four bayonet lock sliding grooves are respectively communicated with the four second mounting grooves; four limiting sliding chutes which are uniformly distributed along the circumferential direction of the axis of the rotating drum are formed in the side surface of the rotating drum; the four limiting sliding chutes and the four clamping pin sliding chutes respectively correspond to the circumferential positions of the rotary drum; the outer side surface of the movable clamping block is provided with an inserting rod hole; the outer side surface of the fixed clamping block is provided with a threaded hole;

the number of the crystal bead clamps is four; the four crystal bead clamps are respectively fixed in the four first mounting grooves and the four second mounting grooves; the working side surfaces of the sliding rails in the four crystal bead clamps face the direction departing from the axis of the central rotating shaft; the four end bolts respectively penetrate through the four mounting holes on the outer mounting disc and are respectively in threaded connection with threaded holes of the clamping blocks in the four crystal bead clamps; the inner ends of the clamping pins of the four crystal bead clamps respectively penetrate through the four clamping pin chutes and extend into the corresponding insertion rod holes; the outer ends of the clamping pins of the four crystal bead clamps respectively extend out of the four limiting sliding grooves; the middle part of the clamping pin is provided with an annular bulge; the annular bulge of the clamping pin is positioned between the rotary drum and the inner mounting column; the two side edges of the end faces of the opposite ends of the movable clamping block and the fixed clamping block are provided with locking bead blocks; lock bead grooves are formed in the mutually adjacent edges of the two lock bead blocks on the movable clamping block, which are far away from the side surfaces of the movable clamping block; lock bead grooves are formed in the edges, adjacent to each other, of the two lock bead blocks on the fixed clamping block, far away from the side faces of the fixed clamping block;

the station conversion driving assembly comprises a station conversion motor, a coding disc and a station detection sensor; the station detection sensor adopts a photoelectric sensor; the station switching motor is fixed with the clamping frame; one output shaft of the station switching motor is fixed with the inner end of the central rotating shaft; the other output shaft of the station switching motor is fixed with the coding disc; four detection holes are uniformly distributed along the circumferential direction of the axis of the coding disc; the station detection sensor is fixed with the clamping frame; the detection head of the station detection sensor is arranged towards the coding disc, and the distance from the detection head to the axis of the coding disc is equal to the distance from the axis of the detection hole to the axis of the coding disc;

the ball clamping driving assembly comprises a first air cylinder, a second air cylinder, a first shifting plate and a second shifting plate; the first cylinder and the second cylinder are both fixed with the clamping frame; the push-out rods of the first cylinder and the second cylinder are respectively fixed with the first shifting plate and the second shifting plate; the first shifting plate is positioned right above the rotating shaft assembly; the second shifting plate is positioned on one side of the rotating shaft component; the distance from the first shifting plate and the second shifting plate to the axis of the central rotating shaft is smaller than the distance from the end surface of the outer end of the clamping pin to the axis of the central rotating shaft;

the four crystal bead clamps correspond to four stations; the four stations are respectively a feeding station, a first wire threading station, a second wire threading station and a discharging station which are sequentially arranged in a ring shape along the circumferential direction of the central rotating shaft; the working side surface of the slide rail in the crystal bead clamp at the feeding station faces to the right upper side;

the wire winding and looping mechanism comprises a looping cutting assembly, a straightening assembly, a looping frame and a looping cutting driving assembly; the looper frame is fixed on the bottom plate; the straightening component comprises an adjusting bolt, an adjusting slide block, a U-shaped bearing and a straightening frame; n adjusting slide blocks which are sequentially arranged along the length direction of the straight grinding frame are arranged on the straight grinding frame, and n is more than or equal to 3 and less than or equal to 20; all the adjusting slide blocks and the straight grinding frame form a sliding pair which slides along the width direction of the straight grinding frame; n adjusting bolt groups are arranged on the vertical rolling frame; the adjusting bolt group consists of two adjusting bolts; the n adjusting bolt groups correspond to the n adjusting slide blocks one by one; two adjusting bolts in the same adjusting bolt group are respectively positioned at two sides of the vertical rolling frame and respectively abut against two ends of the corresponding adjusting slide blocks; u-shaped bearings are supported on the n adjusting sliding blocks; sequencing the n adjusting slide blocks in sequence along the length direction of the straight grinding frame; the adjusting slide block with the odd serial number is a first adjusting slide block; the adjusting slide block with the even number is a second adjusting slide block; the U-shaped bearings on all the first adjusting sliding blocks are aligned in the width direction of the straight grinding frame; all the U-shaped bearings on the second adjusting sliding blocks are aligned in the width direction of the straightening frame; the U-shaped bearing on the first adjusting slide block and the U-shaped bearing on the second adjusting slide block are arranged in a staggered manner in the width direction of the vertical rolling frame;

the number of the straightening assemblies is two; the axes of the U-shaped bearings in the two straightening assemblies are vertical to each other; the rolling target lines of the two rolling assemblies are overlapped; the rolling target line of the straightening component is the intersection line of the transverse rolling target surface and the longitudinal rolling target surface; the transverse rolling target surface is a symmetrical surface of two end surfaces of the U-shaped bearing; the longitudinal rolling target surface is a plane with equal distances to the axes of all the U-shaped bearings;

the looping and cutting assembly comprises an adjusting bolt, a compression spring, an adjusting block, a first grinding wheel, a second grinding wheel, a cutting cam, a cutting rocker arm, a cutter mounting block, a looping cutter, a return spring, a first yarn guide frame and a second yarn guide frame; the second grinding wheel is supported on the looper frame; the adjusting block and the looping frame form a sliding pair; the adjusting bolt is in threaded connection with the looping frame; two ends of the compression spring are respectively fixed with the adjusting block and the adjusting bolt; the first grinding wheel is supported on the adjusting block; the first grinding wheel is positioned right above the second grinding wheel; the first yarn guide frame and the second yarn guide frame are fixed on the coiling frame, and the opposite ends of the first yarn guide frame and the second yarn guide frame are respectively close to the gap between the first rolling wheel and the second rolling wheel; wire guide holes are formed in the first wire guide frame and the second wire guide frame; the axes of the wire guide holes on the first wire guide frame and the second wire guide frame are superposed with the rolling target lines of the two rolling assemblies;

the cutter mounting block and the looping frame form a sliding pair; two ends of the reset spring are respectively fixed with the cutter mounting block and the looper frame; the looper knife is fixed at the top of the cutter mounting block; the looping cutter is provided with a first looping groove and a second looping groove; the first looping groove and the second looping groove are arc-shaped and are abutted together; the central lines of the first looping groove and the second looping groove are on the same characteristic spiral line;

the characteristic spiral line is a cylindrical spiral line; the diameters of the wire guide holes on the first wire guide frame and the second wire guide frame, the distance between the first rolling wheel and the second rolling wheel and the lead of the characteristic spiral line are equal; the crystal bead clamps at the first wire feeding station and the second wire feeding station clamp the double-hole crystal octagonal bead, and under the condition that two wire feeding holes of the double-hole crystal octagonal bead are respectively positioned at two sides of the corresponding crystal bead clamp, a characteristic circle simultaneously passes through the wire feeding holes at the positions, adjacent to each other, of the double-hole crystal octagonal bead clamps at the first wire feeding station and the second wire feeding station; the diameter of the characteristic circle is equal to that of the characteristic spiral line, and the circle center is on the central axis of the characteristic spiral line; the characteristic circle is intersected with the first looping groove or the second looping groove;

the cutting cam is supported on the looper frame; the middle part of the cutting rocker arm and the looping frame form a rotating pair; one end of the cutting rocker arm is fixed with a round mounting block, and the other end of the cutting rocker arm props against the bottom of the cutter mounting block; the round mounting block is contacted with the side surface of the cutting cam; the looper cut-off driving component comprises a looper driving piece and a cut-off driving piece; the first grinding wheel and the second grinding wheel are both driven by a looping driving piece; the cutting cam is driven by the cutting driving piece; the full-automatic bead stringing method comprises a preposed preparation method, a feeding method, a material transferring method and a wire threading method;

the wire feeding mechanism comprises a wire discharging motor, a wire feeding disc, a wire feeding support, a wire loading rod, an outer guide pillar, an outer guide sleeve, a wire guide rod, a wire discharging assembly and a detection assembly; the wire feeding disc is supported on the wire feeding bracket; the wire outlet motor is fixed on the wire feeding support; an output shaft of the wire outlet motor is coaxially arranged with the wire feeding disc; four adjusting grooves arranged along the radial direction of the wire feeding disc are formed in the wire feeding disc, and the bottom ends of four wire loading rods uniformly distributed along the circumferential direction of the wire feeding disc are respectively fixed in the four adjusting grooves of the wire feeding disc; the bottom ends of four outer guide posts which are uniformly distributed along the circumferential direction of the wire feeding disc are fixed with the top of the wire feeding support; the four outer guide sleeves and the four outer guide pillars respectively form sliding pairs and are fixed through set screws respectively; the four outer guide sleeves and the bottom ends of the four wire guide rods are respectively fixed; the top ends of the four wire guide rods are provided with first wire guide rings;

the wire outlet assembly is positioned between two adjacent wire guide rods; the wire outlet assembly comprises a wire outlet shell, a rocker and a wire outlet spring; the wire outlet shell is fixed with the wire feeding support; the inner end of the rocker is hinged with the wire outlet shell; two ends of the wire outlet spring are respectively fixed with the wire feeding support and the rocker; the outer end of the rocker is provided with a second yarn guide ring;

the detection assembly comprises a non-silk detection piece and a silk outlet delay detection piece; the wire-free detection piece comprises four annular Hall sensors; the detection ports of the four annular Hall sensors are coaxially fixed with first wire guide rings on the four wire guide rods; the wire outlet hysteresis detection piece comprises a detection metal block and two hysteresis Hall sensors; the detection metal block is fixed on the rocker; the two hysteresis Hall sensors are both fixed in the wire outlet shell; the distances from the detection metal block and the two lag Hall sensors to the rocker and the hinge shaft of the wire outlet shell are equal; the connecting lines of the two lag Hall sensors, the rocker and the hinge shaft of the wire outlet shell form an angle of 120 degrees; under the state that the outer end of the rocker is not stressed, the metal block is detected to be close to one of the hysteresis Hall sensors; the other hysteresis Hall sensor is positioned on one side of the rocker close to the straightening assembly;

the preparation method comprises the following specific steps:

loading the double-hole crystal octagonal beads into a vibration disc; the processing end of the iron wire penetrates through the space between the U-shaped bearing on the first adjusting slide block and the U-shaped bearing on the second adjusting slide block in the two straightening assemblies, penetrates through wire guide holes in the first wire guide frame and the second wire guide frame and then abuts against the inlet end of the first looping groove in the looping knife;

the feeding method comprises the following specific steps:

firstly, starting a vibration disc and a straight vibration device; the double-hole crystal octagonal beads enter the conveying rail bars and the discharging blocks one by one under the driving of the vibration disc; the double-hole crystal octagonal bead which is positioned at the position farthest away from the vibration disk reaches between the upper clamping pipe and the lower clamping pipe,

step two, starting a sliding table cylinder to enable the upper clamping pipe and the lower clamping pipe to slide oppositely to clamp the double-hole crystal octagonal bead;

rotating the material moving motor forward to enable the material moving plate to slide towards the material moving mechanical arm; the clamped double-hole crystal octagonal bead leaves the discharge chute;

in the sliding process of the material moving plate, if the receiver of the optical fiber laser correlation sensor cannot detect the light emitted by the emitter, the rotary position motor rotates until the receiver of the optical fiber laser correlation sensor detects the light emitted by the emitter;

fourthly, stopping the material moving motor after the material moving plate reaches the rotary track of the pneumatic clamping jaw; if the pneumatic clamping jaw is not at the initial position, the upper clamping tube and the lower clamping tube are kept static, and the pneumatic clamping jaw is waited to reach the initial position; if the pneumatic clamping jaw is located at the initial position, the pneumatic clamping jaw clamps two opposite sides of the double-hole crystal octagonal bead; the sliding table cylinder drives the upper clamping pipe and the lower clamping pipe to slide back to back, and the double-hole crystal octagonal beads are loosened; entering the step five;

step five, reversing the material moving motor to reset the material moving plate, and repeatedly executing the step two, the step three and the step four;

the material transferring method comprises the following specific steps:

step one, if the double-hole crystal octagonal bead is clamped on the pneumatic clamping jaw, the motor is transferred to rotate forwards, so that the double-hole crystal octagonal bead on the pneumatic clamping jaw reaches the position above a crystal bead clamp at a feeding station;

step two, if the crystal bead clamp at the feeding station clamps the double-hole crystal octagonal bead, keeping the pneumatic clamping jaw still, and waiting for the crystal bead clamp which does not clamp the double-hole crystal octagonal bead to enter the feeding station;

if the crystal bead clamp at the feeding station does not clamp the double-hole crystal octagonal bead, the first cylinder of the crystal bead clamp at the feeding station retracts, so that the movable clamping block in the crystal bead clamp at the feeding station slides towards the direction departing from the fixed clamping block;

rotating the lifting motor forwards to enable the square shaft to slide downwards, and enabling the double-hole crystal octagonal beads on the pneumatic clamping jaw to reach a position between a movable clamping block and a fixed clamping block in the crystal bead clamp at the feeding station;

pushing out the first cylinder to enable the movable clamping block and the fixed clamping block in the crystal bead clamp at the feeding station to clamp the double-hole crystal octagonal bead;

fifthly, loosening the double-hole crystal octagonal bead by the pneumatic clamping jaw, and reversely rotating the lifting motor to enable the square shaft to slide upwards for resetting; entering a sixth step;

sixthly, reversing the transfer motor, resetting the pneumatic clamping jaw, and repeatedly executing the first step, the second step, the third step, the fourth step and the fifth step;

the wire threading method comprises the following specific steps:

step one, if the crystal bead clamp at the feeding station does not clamp the double-hole crystal octagonal bead, waiting for the pneumatic clamping jaws to load the double-hole crystal octagonal bead into the crystal bead clamp at the feeding station;

if the crystal bead clamp at the feeding station clamps the double-hole crystal octagonal bead, the station switching motor rotates to enable the crystal bead clamp at the feeding station to reach a first wire threading station; then executing the step two;

step two, if the crystal bead clamp on the second wire feeding station does not clamp the double-hole crystal octagonal bead, executing the step one again;

if the crystal bead clamps on the first wire feeding station and the second wire feeding station clamp the double-hole crystal octagonal bead, entering a third step;

thirdly, the wire feeding motor and the wire discharging motor rotate, and the first grinding wheel and the second grinding wheel drive the processing end of the iron wire to slide on the inlet end of the first looping groove; after being bent in the first looping groove, the iron wire slides out of the outlet end of the first looping groove and penetrates through the wire penetrating holes of the double-hole crystal octagonal beads on the first wire penetrating station and the second wire penetrating station; after being wound into a ring shape, the iron wire slides into the inlet end of the second looping groove;

step four, after the processing end of the iron wire reaches the outlet end of the second looping groove, stopping the wire feeding motor and the wire discharging motor, and rotating the cutting motor to enable the looping knife to slide upwards, so that the iron wire is cut off from the inlet end of the first looping groove;

step five, if the crystal bead clamp at the feeding station does not clamp the double-hole crystal octagonal bead, waiting for the pneumatic clamping jaws to load the double-hole crystal octagonal bead into the crystal bead clamp at the feeding station;

if the crystal bead clamp at the feeding station clamps the double-hole crystal octagonal bead, the station switching motor rotates to enable the crystal bead clamp at the second wire threading station to reach the blanking station;

step six, retracting the second air cylinder to enable the movable clamping block in the crystal bead clamp at the blanking station to slide towards the direction departing from the fixed clamping block, and enabling the double-hole crystal octagonal bead clamped by the crystal bead clamp at the blanking station to fall off; entering a seventh step;

pushing out by a second cylinder to reset a movable clamping block in the crystal bead clamp at the blanking station; and repeatedly executing the steps II, III, IV, V and VI.

2. The full-automatic crystal bead serial connection method according to claim 1, characterized in that: two material blocking spring pieces are arranged on the end face of the outlet end of the discharging block in a centering manner; the distance between the two material blocking spring pieces is smaller than the width of the discharge chute.

3. The full-automatic crystal bead serial connection method according to claim 1, characterized in that: the rotary material moving mechanism further comprises a contact piece, a starting point limit sensor and an end point limit sensor; the starting point limit sensor and the end point limit sensor both adopt photoelectric sensors and are fixed on the material moving frame; the top of the material moving plate is fixed with one end of the contact piece;

4. The full-automatic crystal bead serial connection method according to claim 1, characterized in that: when the upper clamping pipe and the lower clamping pipe are positioned at the terminal limit positions, the double-hole crystal octagonal bead between the upper clamping pipe and the lower clamping pipe is positioned on the rotation track of the upper jaw body of the pneumatic clamping jaw; the crystal bead clamp at the feeding station is positioned on the rotation track of the claw body on the pneumatic clamping jaw.

5. The full-automatic crystal bead serial connection method according to claim 1, characterized in that: the first shifting plate and the second shifting plate are both positioned on one side of the four clamping pins close to the outer mounting plate.

6. The full-automatic crystal bead serial connection method according to claim 1, characterized in that: when the looping cutter is positioned at the lower extreme point, the end of the wire guide hole on the second wire guide frame, which is far away from the first wire guide frame, is opposite to the inlet end of the first looping groove; and under the state that the looping cutter is positioned at the upper extreme point, the end of the wire guide hole on the second wire guide frame, which is far away from the first wire guide frame, is lower than the inlet end of the first looping groove.