Positioning system and ultrasonic welding method

Abstract

The invention provides a positioning system which comprises a rotating frame fixed in position, a rotating shaft is horizontally and rotatably arranged on the rotating frame, a rotating plate is arranged at one end of the rotating shaft, a motor used for driving the rotating shaft to rotate is arranged on the rotating frame, and the length direction of the rotating plate is the X direction; the adjusting pieces are movably connected to the rotating plate in a sleeving mode, the adjusting pieces can move in the X direction, and the multiple adjusting pieces are arranged on the rotating plate; the first positioning mechanism is used for fixing the position of the adjusting part; each adjusting part is provided with a pressing arm, the pressing arms are perpendicular to the adjusting parts, a plurality of adjusting holes are formed in the pressing arms in a penetrating mode, and the minimum distances between the different adjusting holes and the adjusting parts are different. Each pressing arm is provided with a pressing column, the pressing columns are perpendicular to the pressing arms, and the pressing columns can penetrate through any adjusting hole. The invention provides a novel positioning system.

Description

Technical Field

[0001] The invention belongs to the technical field of ultrasonic welding and relates to a positioning system and an ultrasonic welding method. Background Art

[0002] Ultrasonic welding is a process in which an ultrasonic generator converts a 50 / 60 Hz current into 15, 20, 30 or 40KHz electrical energy. The converted high-frequency electrical energy is converted again into mechanical motion of the same frequency by a transducer, and then the mechanical motion is transmitted to the welding head through a set of amplitude-changing rod devices that can change the amplitude. The welding head transmits the received vibration energy to the joint of the workpiece to be welded, where the vibration energy is converted into heat energy by friction, melting the plastic, and then the plastic can be connected as a whole after cooling and the welding is completed. Ultrasonic waves can not only be used to weld hard thermoplastics, but also to process fabrics and films.

[0003] At present, ultrasonic welding is used in the processing of some automobile parts in the market, such as the decorative parts on the lower part of the door, the decorative parts on the B-pillar, etc. (all of which are plastic parts); the parts to be ultrasonically welded all include two parts, namely the outer shell part and the inner plate part; when welding, the worker first needs to snap the inner plate part into the outer shell part, and then put the outer shell part upside down into the contoured groove of the support seat (matching the shape of the outer shell part), and then move downward through the positioning structure to press the inner plate part and the outer shell part, and make the inner plate part and the outer shell part fully fit; finally, the robot moves the ultrasonic welding head according to the set route, and acts on several positions of the inner plate part and the outer shell part, so as to complete the ultrasonic welding of the inner plate part and the outer shell part. Summary of the invention

[0004] The purpose of the present invention is to provide a positioning system, aiming to provide a new positioning system.

[0005] In order to achieve the above technical effects, the present invention provides a positioning system, comprising:

[0006] A fixed rotating frame, wherein a rotating shaft is arranged on the rotating frame for horizontal rotation, a rotating plate is arranged at one end of the rotating shaft, a motor for driving the rotating shaft to rotate is arranged on the rotating frame, and the length direction of the rotating plate is the X direction;

[0007] An adjusting member, the adjusting member is movably sleeved on the rotating plate, and the adjusting member can move along the X direction, and a plurality of the adjusting members are arranged on the rotating plate;

[0008] a first positioning mechanism, the first positioning mechanism being used to fix the position of the adjusting member;

[0009] A clamping arm, each of the adjusting members is provided with a clamping arm, and the clamping arm is perpendicular to the adjusting member, and a plurality of adjusting holes are formed through the clamping arm, and the minimum distances between different adjusting holes and the adjusting member are different;

[0010] A clamping column is provided on each of the clamping arms, and the clamping column is perpendicular to the clamping arm, and the clamping column can pass through any of the adjustment holes.

[0011] The present invention is further configured to include a fixed frame, a fixed platform is horizontally arranged on the top of the fixed frame, a support platform is detachably arranged on the top of the fixed platform, a contour groove is opened on the top of the support platform, and the contour groove is used to clamp the workpiece to be welded. When the rotating plate rotates, the clamping column can be against the top of the workpiece.

[0012] The present invention is further configured such that the adjusting member is annular, and the inner wall of the adjusting member is movably fitted to the rotating plate, both sides of the rotating plate are provided with long strip-shaped adjusting grooves, the length direction of the adjusting grooves is the X direction, and the longitudinal section of the adjusting grooves is a rectangle, the first positioning mechanism includes two positioning units, the two positioning units are located at both ends of the adjusting member, and the positioning units include:

[0013] A reset plate, the reset plate is movably located in the adjustment groove, and the reset plate is connected to the inner wall of the adjustment member;

[0014] A spreading piece, wherein the top and bottom of the spreading piece on the side facing away from the reset plate are provided with spreading grooves, the top and bottom of the spreading piece are movably fitted to the inner wall of the adjustment groove, and the depth of the spreading groove increases as the distance from the reset plate increases;

[0015] An adjusting mechanism, the adjusting mechanism is used to adjust the position of the spreading member and make the spreading member approach or move away from the reset plate;

[0016] A return spring, one end of which is connected to the return plate, and the other end of which is connected to the expansion member;

[0017] A linkage frame, one end of which is connected to the inner wall of the adjusting member, and two support frames are arranged opposite to each other on the side, and two vertical holes are arranged on each of the support frames, and the ends of the vertical holes away from the linkage frame are connected to each other and are provided with inclined holes in an inclined shape, and the distance between the free end of the inclined hole and the reset plate is smaller than the distance between the vertical hole and the reset plate;

[0018] A locking column, wherein both ends of the locking column are coaxially provided with locking parts, the diameter of the locking part is smaller than the diameter of the locking column, the locking part is movably located in the vertical hole or the oblique hole, and the diameter of the locking part is equal to the width of the vertical hole and the width of the oblique hole;

[0019] A first elastic member, wherein the first elastic member is continuously in an extended state, and two ends of the first elastic member are respectively connected to the two locking portions on the same side;

[0020] The locking column includes a locked state and an unlocked state;

[0021] When the locking column is in the locking state, the outer side of the locking column is in contact with the inner wall of the adjusting groove and the inner wall of the expansion groove, and the locking portion is located at the outer end of the vertical hole or in the oblique hole or at the connection between the vertical hole and the oblique hole;

[0022] When the locking column is in the unlocked state, the locking portion is located at the inner end of the vertical hole, and the end of the expansion member facing away from the reset plate is directly opposite to the two locking columns;

[0023] The locking column in one of the positioning units is located at the -X side of the corresponding reset plate, and the locking column in the other positioning unit is located at the X side of the corresponding reset plate.

[0024] The present invention is further configured such that the top and bottom of the spreading member are both provided with guide parts, the adjusting groove is provided with a guide groove, the guide part is movably fitted to the inner wall of the guide groove, two first elastic members are provided, the two spreading frames are both located between the two first elastic members, and the two ends of the locking column are movably fitted to the inner side of the spreading frame;

[0025] The top and bottom of the reset plate are both horizontally provided with a stop plate, and when the locking column is in the unlocked state, the propping member abuts against the stop plate.

[0026] The present invention is further configured such that a driving groove is provided on the outer side of the propping member, and the depth of the driving groove decreases as the distance between the propping member and the reset plate increases;

[0027] The regulating mechanism comprises:

[0028] An adjustment frame, the adjustment frame is U-shaped, and both ends of the adjustment frame are connected to the outer side of the adjustment member, and a positioning rod is hingedly provided in the middle of the adjustment frame;

[0029] A telescopic cylinder, the telescopic cylinder being horizontally arranged on the outer wall of the adjusting member;

[0030] A telescopic column, wherein the longitudinal section of the telescopic column is rectangular, the outer wall of the telescopic column is movably fitted to the inner wall of the telescopic tube, and the telescopic column movably passes through the adjusting member, and a driving wheel is rotatably provided at the inner end of the telescopic column, and the driving wheel movably contacts the inner wall of the driving groove, and when the locking column is in the locking state, the straight line where the telescopic column is located is collinear with the straight line where the positioning rod is located, and a second positioning mechanism for fixing the angle of the positioning rod is provided on the adjusting frame.

[0031] The present invention is further configured such that the second positioning mechanism includes a T-shaped positioning portion arranged at the top of the positioning rod, a movable seat is arranged at the top of one end of the adjustment frame, and movable grooves that penetrate through the two ends of the movable seat are opened on both sides of the movable seat, a positioning piece is horizontally movably sleeved on the movable seat, and the longitudinal section of the positioning piece is U-shaped with an opening downward, a movable bar is arranged on the inner wall of the positioning piece, and the movable bar is movably engaged with the movable groove, a second elastic piece is arranged between the positioning piece and the outer side of the adjustment piece, the bottom of the positioning portion abuts against the adjustment frame, and the top abuts against the positioning piece, and the second elastic piece is at its original length.

[0032] The present invention is further configured such that an inclined driving inclined plate is provided on a side of the positioning member away from the adjusting member, and an anti-slip plate is provided on a side close to the adjusting member, and the anti-slip plate is connected to the second elastic member, and when the positioning portion rotates toward the adjusting frame, the positioning portion can act on the upper side of the driving inclined plate, and drive the positioning member to move toward the adjusting member, and compress the second elastic member;

[0033] An unlocking handle is arranged on the top of the positioning member, a vertical portion perpendicular to the telescopic column is arranged on the outer top of the telescopic column, and a drag reduction ball is rotatably arranged on the free end of the positioning rod.

[0034] The present invention is further configured as follows: the clamping column includes a first threaded portion, a second threaded portion and a clamping portion that are connected in sequence, the first threaded portion and the second threaded portion have opposite rotation directions, the first threaded portion movably passes through the adjusting hole, the inner wall of the adjusting hole is smooth, a first threaded barrel is threadedly provided on the first threaded portion, a first disk portion is provided on the outer side of the end of the first threaded barrel, a second threaded barrel is threadedly provided on the second threaded portion, a second disk portion is provided on the outer wall of an end of the second threaded barrel away from the first threaded barrel, a cylindrical extension barrel is provided on the side of the second disk portion close to the first disk portion, the free end of the extension barrel is located between the first threaded barrel and the second threaded barrel, a third disk portion is provided on the outer side of the free end of the extension barrel, and the first disk portion and the third disk portion are attached to both sides of the clamping arm;

[0035] It also includes a fastening piece with a U-shaped cross-section, the fastening piece is made of elastic material, one end of the fastening piece is provided with a first fastening groove for the first threaded tube to be clamped, and the other end is provided with a second fastening groove for the extension tube to be clamped, the first disc part and the third disc part are respectively attached to the inner walls on both sides of the fastening piece, the inner wall of one end of the fastening piece is provided with a first fastening part, and the inner wall of the other end is provided with a second fastening part, the cross-sections of the first fastening part and the second fastening part are both triangular, the inner ends of the two first fastening parts on the side close to each other are provided with a first fitting groove, the first fitting groove is attached to the outer edge of the first disc part, the inner ends of the two second fastening parts on the side close to each other are provided with a second fitting groove, and the second fitting groove is attached to the outer edge of the third disc part;

[0036] When the fastening member moves toward the corresponding clamping arm, the first disk portion acts on the inner side surface of the first fitting portion and drives one side of the fastening member to elastically deform outward, and the third disk portion acts on the inner side surface of the second fitting portion and drives the other side of the fastening member to elastically deform outward.

[0037] The present invention is further configured that two adjusting rails are arranged facing each other on both sides of the top of the adjusting member, the two ends of the adjusting rails are flush with the two ends of the adjusting member, the cross-sections of the adjusting rails are all L-shaped, and an adjusting groove with a convex cross-section is formed between the two adjusting rails and the outer side of the adjusting member, an adjusting seat matching the adjusting groove is movably arranged in the adjusting groove, a transition seat is arranged at the outer end of the adjusting seat, the periphery of one end of the adjusting seat connected to the transition seat is located on the inner side of the edge of the transition seat, the end of the clamping arm is fixedly connected to the transition seat, and a plurality of triangular limiting grooves are opened at one end of the adjusting rail away from the adjusting member;

[0038] A through hole is horizontally provided through the transition seat, and two linkage holes are provided on a side of the through hole close to the adjustment seat, a linkage member is movably provided in the linkage hole, an operating member is provided between the tops of the two linkage members, both ends of the operating member are movably located outside the through hole, and a third elastic member which is continuously in a compressed state is provided between the top of the operating member and the inner wall of the through hole;

[0039] A synchronous member is horizontally arranged at one end of the linkage member away from the operating member, and a plurality of positioning strips are vertically arranged at the bottom of the synchronous member, and each of the positioning strips can be inserted into any of the limiting grooves.

[0040] The present invention also provides an ultrasonic welding method using a positioning system as described in any one of the above items, comprising the following steps:

[0041] S1, selecting the number of adjusting members required to be used according to the shape of the workpiece, and moving the adjusting members required to be used to corresponding positions on the rotating plate, and fixing the positions of the adjusting members by the first positioning mechanism;

[0042] S2, selecting the adjustment hole where the clamping column is located according to the shape of the workpiece;

[0043] S3, assembling the two workpieces to be welded together and placing them in corresponding positions;

[0044] S4, the motor drives the rotating shaft to rotate, and the rotating shaft drives the rotating plate to rotate, so that all the pressing columns are pressed at the set position of the workpiece;

[0045] S5, the robot moves the ultrasonic welding head and applies the ultrasonic welding head to the specified position of the workpiece;

[0046] S 6, after the ultrasonic welding is completed, the motor drives the rotating shaft to rotate, so that all the clamping columns are separated from the workpiece, waiting for the next time to clamp the workpiece.

[0047] Compared with the prior art, the present invention provides a positioning system, which selects the number of adjustment parts required to be used according to the shape of the workpiece, and moves the adjustment parts required to be used to the corresponding position on the rotating plate, and fixes the position of the adjustment parts by a first positioning mechanism; selects the adjustment hole where the clamping column is located according to the shape of the workpiece (such as the B-pillar decorative plate of the automobile); assembles the two workpieces to be welded together and places them in the corresponding position; the motor drives the rotating shaft to rotate, the rotating shaft drives the rotating plate to rotate, and all the clamping columns are clamped at the set position of the workpiece; the manipulator moves the ultrasonic welding head and acts on the specified position of the workpiece (where the manipulator and the ultrasonic welding head are both mature products directly purchased on the market); after the ultrasonic welding is completed, the motor drives the rotating shaft to rotate, so that all the clamping columns are separated from the workpiece and wait for the next time to clamp the workpiece. Even if the shape of the workpiece changes, it only needs to select the number of adjustment parts required to be used and adjust the position of the clamping column at the same time, so that different workpieces can be clamped and ultrasonically welded, so that one device can clamp multiple models of products, greatly saving the use cost.

[0048] It should also be understood that the positioning system of the present application is not only applicable to the positioning of workpieces in ultrasonic welding, but can be applied to all products that need to be pressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a structural schematic diagram of an embodiment of a positioning system of the present invention;

[0050] Figure 2 yes Figure 1A magnified view of part A;

[0051] Figure 3 yes Figure 2 A magnified view of part A1;

[0052] Figure 4 yes Figure 2 A magnified view of part A2;

[0053] Figure 5 yes Figure 2 A magnified view of the A3 section;

[0054] Figure 6 yes Figure 1 A magnified view of part B;

[0055] Figure 7 Schematic diagram of an embodiment of a first positioning mechanism part of a positioning system of the present invention Figure 1 ;

[0056] Figure 8 Schematic diagram of an embodiment of a first positioning mechanism part of a positioning system of the present invention Figure 2 ;

[0057] Fig. 9 yes Figure 8 Enlarged view of part C;

[0058] Fig.10 It is a schematic diagram of an embodiment of a linkage frame part in a positioning system of the present invention;

[0059] Fig.11 It is a schematic diagram of an embodiment of a propping-out member part of a positioning system of the present invention;

[0060] Fig.12 is a schematic diagram of an embodiment of an adjustment frame part of a positioning system of the present invention;

[0061] Fig.13 It is an internal schematic diagram of an embodiment of a positioning member part in a positioning system of the present invention;

[0062] Fig.14 is a cross-sectional view of an embodiment of an adjusting member part of a positioning system of the present invention;

[0063] Fig.15 is a schematic diagram of an embodiment of an operating element part of a positioning system of the present invention;

[0064] Fig.16 is a cross-sectional view of an embodiment of an operating member part of a positioning system of the present invention;

[0065] Fig.17 is a schematic diagram of an embodiment of a compression column part in a positioning system of the present invention;

[0066] Fig.18 It is an exploded view of an embodiment of a compression column part of a positioning system of the present invention;

[0067] Fig.19 is a schematic diagram of an embodiment of a fastening member in a positioning system of the present invention;

[0068] Fig. 20 It is a cross-sectional view of an embodiment of the second threaded barrel portion in a positioning system of the present invention.

[0069] Among them, 1, rotating frame; 2, rotating shaft; 3, rotating plate; 4, motor; 5, adjusting member; 6, clamping arm; 7, adjusting hole; 8, clamping column; 8a, first threaded portion; 8b, second threaded portion; 8c, clamping portion; 9, fixed frame; 10, fixed platform; 11, supporting platform; 12, contoured groove; 13, adjusting groove; 14, reset plate; 15, opening member; 16, opening groove; 17, reset spring; 18, linkage frame; 19, opening frame; 20, vertical hole; 21, oblique hole; 22, locking column; 23, locking portion; 24, first elastic member; 25, guide portion; 26, guide groove; 27, stop plate; 28, driving groove; 29, adjusting frame; 30, positioning rod; 31, telescopic cylinder; 32, telescopic column; 33, driving wheel; 34, positioning part; 35, movable seat; 36, movable groove; 37, positioning member; 38, movable strip; 39, second elastic member; 40, driving inclined plate; 41, anti-slip plate; 42, unlocking handle; 43, vertical part; 44, drag reduction ball; 45, first threaded cylinder; 46, first disc part; 47, second threaded cylinder; 48, second disc part; 49, extension cylinder; 50, third disc part; 51, fastening member; 52, first engaging groove; 53, second engaging groove; 54, first fastening part; 55, second fastening part; 56, first fitting groove; 57, second fitting groove; 58, adjusting rail; 59, adjusting seat; 60, transition seat; 61, limiting groove; 62, through hole; 63, linkage member; 64, operating member; 65, third elastic member; 66, synchronous member; 67, positioning strip. DETAILED DESCRIPTION

[0070] The following is a further detailed description of a positioning system and an ultrasonic welding method proposed by the present invention in combination with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer according to the following description. It should be noted that the accompanying drawings are in a very simplified form and are not in precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. The same or similar reference numerals in the accompanying drawings represent the same or similar components.

[0071] A positioning system such as Figures 1 to 20 As shown, including:

[0072] A rotating frame 1 is fixed in position, a rotating shaft 2 is horizontally rotatably arranged on the rotating frame 1, a rotating plate 3 is arranged at one end of the rotating shaft 2, a motor 4 for driving the rotating shaft 2 to rotate is arranged on the rotating frame 1, and the length direction of the rotating plate 3 is the X direction;

[0073] An adjusting member 5, wherein the adjusting member 5 is movably sleeved on the rotating plate 3, and the adjusting member 5 can move along the X direction, and a plurality of the adjusting members 5 are arranged on the rotating plate 3;

[0074] A first positioning mechanism, the first positioning mechanism is used to fix the position of the adjusting member 5;

[0075] A clamping arm 6, each of the adjusting members 5 is provided with a clamping arm 6, and the clamping arm 6 is perpendicular to the adjusting member 5, and a plurality of adjusting holes 7 are formed through the clamping arm 6, and the minimum distances between different adjusting holes 7 and the adjusting member 5 are different;

[0076] A clamping column 8 is provided on each of the clamping arms 6 , and the clamping column 8 is perpendicular to the clamping arm 6 . The clamping column 8 can pass through any of the adjusting holes 7 .

[0077] It also includes a fixing frame 9, a fixing platform 10 is horizontally arranged on the top of the fixing frame 9, a supporting platform 11 is detachably arranged on the top of the fixing platform 10, a profiling groove 12 is opened on the top of the supporting platform 11, and the profiling groove 12 is used to clamp the workpiece to be welded. When the rotating plate 3 rotates, the clamping column 8 can be against the top of the workpiece.

[0078] The adjusting member 5 is annular, and the inner wall of the adjusting member 5 is movably attached to the rotating plate 3. Both sides of the rotating plate 3 are provided with long strip-shaped adjusting grooves 13, the length direction of the adjusting grooves 13 is the X direction, and the longitudinal section of the adjusting grooves 13 is rectangular. The first positioning mechanism includes two positioning units, which are located at both ends of the adjusting member 5. The positioning units include:

[0079] A reset plate 14, wherein the reset plate 14 is movably located in the adjustment slot 13, and the reset plate 14 is connected to the inner wall of the adjustment member 5;

[0080] A spreading member 15, wherein a spreading groove 16 is formed at the top and the bottom of the side of the spreading member 15 facing away from the reset plate 14, and the top and the bottom of the spreading member 15 are movably fitted to the inner wall of the adjustment groove 13, and the depth of the spreading groove 16 increases as the distance from the reset plate 14 increases;

[0081] An adjusting mechanism, the adjusting mechanism is used to adjust the position of the propping member 15 and make the propping member 15 approach or move away from the reset plate 14;

[0082] A return spring 17, one end of which is connected to the return plate 14, and the other end of which is connected to the expansion member 15;

[0083] A linkage frame 18, one end of which is connected to the inner wall of the adjusting member 5, and two support frames 19 are arranged on the sides opposite to each other, and two vertical holes 20 are formed on the support frames 19, and the ends of the vertical holes 20 away from the linkage frame 18 are connected to each other and are provided with oblique holes 21 in an inclined shape, and the distance between the free end of the oblique hole 21 and the reset plate 14 is smaller than the distance between the vertical hole 20 and the reset plate 14;

[0084] A locking column 22, wherein both ends of the locking column 22 are coaxially provided with locking portions 23 (preferably, the locking portion 23 is columnar, and the locking column 22 is rotatably sleeved on the outer wall of the locking portion 23, and both ends of the locking portion 23 are located at the outer ends of the locking column 22), the diameter of the locking portion 23 is smaller than the diameter of the locking column 22, the locking portion 23 is movably located in the vertical hole 20 or the oblique hole 21, and the diameter of the locking portion 23 is equal to the width of the vertical hole 20 and the width of the oblique hole 21;

[0085] A first elastic member 24, wherein the first elastic member 24 is continuously in an extended state, and two ends of the first elastic member 24 are respectively connected to the two locking portions 23 on the same side;

[0086] The locking column 22 includes a locked state and an unlocked state;

[0087] When the locking column 22 is in the locking state, the outer side of the locking column 22 is in contact with the inner wall of the adjusting slot 13 and the inner wall of the opening slot 16, and the locking portion 23 is located at the outer end of the vertical hole 20 or in the oblique hole 21 or at the connection between the vertical hole 20 and the oblique hole 21;

[0088] When the locking column 22 is in the unlocked state, the locking portion 23 is located at the inner end of the vertical hole 20, and the end of the expansion member 15 facing away from the reset plate 14 is directly between the two locking columns 22;

[0089] The locking column 22 in one of the positioning units is located at the −X side of the corresponding reset plate 14 , and the locking column 22 in the other positioning unit is located at the X side of the corresponding reset plate 14 .

[0090] The top and bottom of the expansion member 15 are both provided with guide portions 25, the adjusting groove 13 is provided with a guide groove 26, the guide portion 25 is movably fitted to the inner wall of the guide groove 26, two first elastic members 24 are provided, the two expansion frames 19 are both located between the two first elastic members 24, and the two ends of the locking column 22 are movably fitted to the inner side of the expansion frame 19;

[0091] The top and bottom of the reset plate 14 are both horizontally provided with stop plates 27 . When the locking column 22 is in the unlocked state, the expansion member 15 abuts against the stop plates 27 .

[0092] A driving groove 28 is formed on the outer side of the propping member 15, and the depth of the driving groove 28 decreases as the distance from the reset plate 14 increases;

[0093] The regulating mechanism comprises:

[0094] An adjustment frame 29, wherein the adjustment frame 29 is U-shaped, and both ends of the adjustment frame 29 are connected to the outer side of the adjustment member 5, and a positioning rod 30 is hingedly provided in the middle of the adjustment frame 29;

[0095] A telescopic cylinder 31, wherein the telescopic cylinder 31 is horizontally arranged on the outer wall of the adjusting member 5;

[0096] The telescopic column 32 has a rectangular longitudinal section, the outer wall of the telescopic column 32 is movably fitted to the inner wall of the telescopic tube 31, and the telescopic column 32 is movably passed through the adjusting member 5 (with a hole for the telescopic column 32 to pass through), and a driving wheel 33 is rotatably provided at the inner end of the telescopic column 32, and the driving wheel 33 is movably abutted against the inner wall of the driving groove 28. When the locking column 22 is in the locking state, the straight line where the telescopic column 32 is located is collinear with the straight line where the positioning rod 30 is located, and a second positioning mechanism for fixing the angle of the positioning rod 30 is provided on the adjusting frame 29.

[0097] The second positioning mechanism includes a T-shaped positioning portion 34 arranged on the top of the positioning rod 30, a movable seat 35 is arranged on the top of one end of the adjustment frame 29, and movable grooves 36 that penetrate through the two ends of the movable seat 35 are opened on both sides of the movable seat 35. A positioning member 37 is horizontally and movably sleeved on the movable seat 35, and the longitudinal section of the positioning member 37 is U-shaped with an opening downward, and a movable bar 38 is arranged on the inner wall of the positioning member 37, and the movable bar 38 is movably engaged with the movable groove 36. A second elastic member 39 is arranged between the positioning member 37 and the outer side of the adjustment member 5, the bottom of the positioning portion 34 abuts against the adjustment frame 29, and the top abuts against the positioning member 37, and the second elastic member 39 is at its original length.

[0098] The side of the positioning member 37 facing away from the adjusting member 5 is provided with an inclined driving inclined plate 40, and the side close to the adjusting member 5 is provided with an anti-slip plate 41, and the anti-slip plate 41 is connected to the second elastic member 39. When the positioning portion 34 rotates toward the adjusting frame 29, the positioning portion 34 can act on the upper side of the driving inclined plate 40, and drive the positioning member 37 to move toward the adjusting member 5, and compress the second elastic member 39.

[0099] An unlocking handle 42 is disposed on the top of the positioning member 37 , a vertical portion 43 perpendicular to the telescopic column 32 is disposed on the outer top of the telescopic column 32 , and a drag reduction ball 44 is rotatably disposed on the free end of the positioning rod 30 .

[0100] The clamping column 8 includes a first threaded portion 8a, a second threaded portion 8b and a clamping portion 8c which are connected in sequence. The first threaded portion 8a and the second threaded portion 8b have opposite rotation directions. The first threaded portion 8a movably passes through the adjusting hole 7. The inner wall of the adjusting hole 7 is smooth. A first threaded barrel 45 is threadedly provided on the first threaded portion 8a. A first disc portion 46 is provided on the outer side of the end of the first threaded barrel 45. A second threaded barrel 47 is threadedly provided on the second threaded portion 8b. A second disc portion 48 is provided on the outer wall of an end of the second threaded barrel 47 away from the first threaded barrel 45. A cylindrical extension barrel 49 is provided on the side of the second disc portion 48 close to the first disc portion 46. The free end of the extension barrel 49 is located between the first threaded barrel 45 and the second threaded barrel 47. A third disc portion 50 is provided on the outer side of the free end of the extension barrel 49. The first disc portion 46 and the third disc portion 50 are attached to the two sides of the clamping arm 6.

[0101] The fastening member 51 is made of elastic material, one end of the fastening member 51 is provided with a first fastening groove 52 for the first threaded tube 45 to be inserted into, and the other end is provided with a second fastening groove 53 for the extension tube 49 to be inserted into, the first disk portion 46 and the third disk portion 50 are respectively attached to the inner walls on both sides of the fastening member 51, the inner wall of one end of the fastening member 51 is provided with a first fastening portion 54, and the inner wall of the other end is provided with a second fastening portion 55, the cross sections of the first fastening portion 54 and the second fastening portion 55 are both triangular, the inner ends of the two first fastening portions 54 on the side close to each other are provided with a first fitting groove 56, the first fitting groove 56 is attached to the outer edge of the first disk portion 46, the inner ends of the two second fastening portions 55 on the side close to each other are provided with a second fitting groove 57, the second fitting groove 57 is attached to the outer edge of the third disk portion 50;

[0102] When the fastening member 51 moves toward the corresponding clamping arm 6, the first disk portion 46 acts on the inner side surface of the first fitting portion and drives one side of the fastening member 51 to elastically deform outward, and the third disk portion 50 acts on the inner side surface of the second fitting portion and drives the other side of the fastening member 51 to elastically deform outward.

[0103] Two adjusting rails 58 are arranged facing each other on both sides of the top of the adjusting member 5, and the two ends of the adjusting rails 58 are flush with the two ends of the adjusting member 5. The cross-sections of the adjusting rails 58 are all L-shaped, and an adjusting groove 13 with a convex cross-section is formed between the two adjusting rails 58 and the outer side of the adjusting member 5. An adjusting seat 59 that matches the adjusting groove 13 is movably arranged in the adjusting groove 13, and a transition seat 60 is arranged at the outer end of the adjusting seat 59. The periphery of one end of the adjusting seat 59 connected to the transition seat 60 is located on the inner side of the edge of the transition seat 60, and the end of the clamping arm 6 is fixedly connected to the transition seat 60. A plurality of triangular limiting grooves 61 are opened at one end of the adjusting rail 58 away from the adjusting member 5;

[0104] A through hole 62 is horizontally formed through the transition seat 60, and two linkage holes are formed on one side of the through hole 62 close to the adjustment seat 59. A linkage member 63 is movably provided in the linkage hole, and an operating member 64 is provided between the tops of the two linkage members 63. Both ends of the operating member 64 are movably located outside the through hole 62, and a third elastic member 65 which is continuously in a compressed state is provided between the top of the operating member 64 and the inner wall of the through hole 62.

[0105] A synchronous member 66 is horizontally disposed at one end of the linkage member 63 away from the operating member 64 , and a plurality of positioning bars 67 are vertically disposed at the bottom of the synchronous member 66 . Each positioning bar 67 can be inserted into any of the limiting grooves 61 .

[0106] The present invention also provides an ultrasonic welding method using a positioning system as described in any one of the above items, comprising the following steps:

[0107] S1, select the number of adjusting members 5 required to be used according to the shape of the workpiece, move the adjusting members 5 required to be used to the corresponding positions on the rotating plate 3, and fix the positions of the adjusting members 5 by the first positioning mechanism;

[0108] S2, selecting the adjustment hole 7 where the pressing column 8 is located according to the shape of the workpiece;

[0109] S3, assembling the two workpieces to be welded together and placing them in corresponding positions;

[0110] S4, the motor 4 drives the rotating shaft 2 to rotate, and the rotating shaft 2 drives the rotating plate 3 to rotate, and all the pressing columns 8 are pressed at the set position of the workpiece;

[0111] S5, the robot moves the ultrasonic welding head and applies the ultrasonic welding head to the specified position of the workpiece;

[0112] S6, after the ultrasonic welding is completed, the motor 4 drives the rotating shaft 2 to rotate, so that all the pressing columns 8 are separated from the workpiece, waiting for the next time to press the workpiece.

[0113] The present invention provides a positioning system, which selects the number of adjusting members 5 required to be used according to the shape of the workpiece, and moves the adjusting members 5 required to be used to the corresponding position on the rotating plate 3, and fixes the position of the adjusting members 5 by a first positioning mechanism; selects the adjusting hole 7 where the clamping column 8 is located according to the shape of the workpiece (such as the B-pillar decorative plate of the automobile); assembles the two workpieces to be welded together and places them in the corresponding position; the motor 4 drives the rotating shaft 2 to rotate, and the rotating shaft 2 drives the rotating plate 3 to rotate, and all the clamping columns 8 are clamped at the position set by the workpiece; the manipulator moves the ultrasonic welding head and acts on the specified position of the workpiece (where the manipulator and the ultrasonic welding head are both mature products directly purchased on the market); after the ultrasonic welding is completed, the motor 4 drives the rotating shaft 2 to rotate, so that all the clamping columns 8 are separated from the workpiece and wait for the next time to clamp the workpiece. Even if the shape of the workpiece changes, it only needs to select the number of adjusting members 5 required to be used, and adjust the position of the clamping column 8 at the same time, so that different workpieces can be clamped and ultrasonically welded, so that one device can clamp multiple models of products, which greatly saves the use cost.

[0114] It should also be understood that the positioning system of the present application is not only applicable to the positioning of workpieces in ultrasonic welding, but can be applied to all products that need to be pressed.

[0115] In actual use, the support platform 11 to be used will be selected on the fixed platform 10 so as to be used for workpieces of different models; when used to press workpieces of different models, it is only necessary to remove the bolts fixing the old support platform 11, then remove the old support platform 11, and then place the new support platform 11 on the fixed platform 10, and then thread the bolts through the support platform 11 and connect them to the fixed platform 10, so that the adjustment of the support platform 11 can be completed. There are multiple groups of threaded holes on the fixed platform 10, which can be adapted to various types of support platforms 11. At the same time, the contoured grooves 12 on the tops of different support platforms 11 are different, so that different types of workpieces can be clamped.

[0116] Then, the position and number of the adjusting member 5 are selected according to the shape of the workpiece. In addition, the position of the clamping column 8 can be adjusted according to the shape characteristics of the workpiece. For example, if the thickness of the workpiece is thicker, the distance between the clamping portion 8c and the clamping arm 6 is smaller; if the width of the workpiece is larger, the first threaded portion 8a is inserted into the adjusting hole 7 farther or / and closer to the adjusting member 5, so that different types of workpieces can be clamped; if the length of the workpiece is longer, more adjusting members 5 are selected, which has a wide range of applications.

[0117] When adjusting the position of the adjusting member 5, it is only necessary to move the positioning member 37 toward the direction close to the adjusting member 5 through the unlocking handle 42, and the limiting effect of the positioning member 37 on the top of the positioning portion 34 disappears, and then the positioning portion 34 is rotated upward, and the drag reduction ball 44 is separated from the vertical portion 43. At this time, the telescopic column 32 is in a free state, and under the pulling force of the return spring 17 (automatic unlocking), the expansion member 15 moves toward the reset plate 14 until the reset plate 14 contacts the end plate 27; since the distance between the expansion member 15 and the linkage frame 18 increases at this time, the limiting effect of the expansion groove 16 on the locking column 22 disappears. At this time, under the pulling force of the first elastic member 24 (the two ends of which are rotationally connected to the two locking portions 23), the two locking portions 23 are close to each other, and finally the two locking portions 23 are moved to the inner end of the vertical hole 20, and the locking column 22 and the inner wall of the adjusting hole 7 are in a separated state.

[0118] After that, the adjusting member 5 can be directly moved along the direction of the rotating plate 3 until the adjusting member 5 moves to a suitable position. Then the worker only needs to rotate the positioning part 34 downward, and the positioning part 34 acts on the outer side of the vertical part 43 through the drag reduction ball 44, and drives the telescopic column 32 inward; and during the rotation of the positioning part 34, its lower side will move against the driving inclined plate 40, and drive the positioning member 37 to move toward the adjusting member 5 through the driving inclined plate 40; until the positioning rod 30 and the telescopic column 32 are in the same straight line, the positioning part 34 just passes over the driving inclined plate 40, at which time the positioning member 37 moves outward under the elastic force of the second elastic member 39, and together with the adjusting frame 29, it plays a role in limiting and clamping the positioning part 34, thereby ensuring the angle of the positioning part 34, and fixing the position of the telescopic column 32 at the same time.

[0119] When the telescopic column 32 moves toward the inside of the adjusting groove 13, the driving wheel 33 at its end moves and abuts against the inner wall of the driving groove 28, and at the same time drives the expansion member 15 to move toward the linkage frame 18; during the movement, the end of the expansion member 15 away from the reset plate 14 is inserted between the two locking columns 22, and finally makes the outer side of the locking column 22 abut against the inner wall of the adjusting groove 13, and at this time the locking portion 23 moves to the outer end of the vertical hole 20 or the inside of the oblique hole 21 or the connection between the vertical hole 20 and the oblique hole 21; in the present application, it is preferred to move to the connection between the vertical hole 20 and the oblique hole 21.

[0120] At this position, for example, the adjusting member 5 has a tendency to move toward the locking column 22. Since the outer side of the locking column 22 contacts the inner wall of the adjusting groove 13, and at the same time the support frame 19 does not drive the locking portion 23, the locking column 22 is not affected by the force of the support frame 19. The support frame 19 is limited by the driving wheel 33, and therefore also has a tendency to move toward the locking column 22. However, since the depth of the support groove 16 in this movement direction gradually decreases, but the diameter of the locking column 22 is fixed, the locking column 22 restricts the inner wall of the support groove 16, and the adjusting member 5 cannot move toward the locking column 22, that is, the locking column 22 and the support groove 16 can play a self-locking role on the adjusting member 5 in this direction.

[0121] At the same time, since in the positioning units at both ends of the adjusting member 5, one of the locking columns 22 is located on the X side of the reset plate 14, and the other locking column 22 is located on the -X side of the reset plate 14, the adjusting member 5 can be self-locked by the locking column 22 and the propping member 15 regardless of whether it is facing the X direction or the -X direction, so that the adjusting member 5 can stop at any position of the rotating plate 3 and has sufficient position stability.

[0122] When the adjusting member 5 is moved, the reset plate 14 and the linkage frame 18 are fixedly connected to the inner wall of the adjusting member 5, so that the opening frame 19, the locking column 22, etc. can be directly driven, and the reset plate 14 can also be directly driven, and the reset spring 17 between the reset plate 14 and the opening member 15 can drive the opening member 15, so that the opening member 15 can also be driven to move along the length direction of the adjusting groove 13; not only that, the guide parts 25 at the top and bottom of the opening member 15 are limited by the guide groove 26, so that the activity stability and position stability of the opening member 15 are better, and the free end of the opening member 15 can be stably inserted between the two locking columns 22. At the same time, in actual use, it is preferred that the diameter of the locking part 23 is slightly smaller than the width of the vertical hole 20 and the width of the oblique hole 21, so that the locking part 23 is easy to move.

[0123] After all the required adjusting members 5 are moved to the appropriate positions, the position of the pressing portion 8c (ultimately acting on the workpiece) needs to be adjusted, wherein the position includes both the distance between it and the edge of the adjusting member 5 (for adapting to the thickness of the workpiece) and the distance between it and the adjusting member 5 (for adapting to the width of the workpiece). In addition, the distance adjustment between the pressing portion 8c and the edge of the adjusting member 5 also includes large-range adjustment and fine adjustment.

[0124] First, when adjusting the distance between the clamping portion 8c and the adjusting member 5, it is only necessary to bend the two ends of the fastening member 51 outwards, so that the first fastening portion 54 and the second fastening portion 55 can be separated from the first disk portion 46 and the third disk portion 50 respectively (the fastening member 51 has elasticity and strength, which can not only be elastically deformed, but also limit the first disk portion 46 and the third disk portion 50), and then move the fastening member 51 toward the middle of the fastening member 51, and finally separate the fastening member 51 from the first disk portion 46 and the third disk portion 50. Then rotate the first threaded barrel 45, remove the first threaded barrel 45 from the first threaded portion 8a, and then directly extract the first threaded portion 8a from the adjusting hole 7 at this time, and insert it into the corresponding adjusting hole 7, and connect the first threaded barrel 45 to the first threaded portion 8a, so that the distance between the clamping portion 8c and the adjusting member 5 is adjusted.

[0125] When adjusting the distance between the clamping portion 8c and the edge of the adjusting member 5, a large range adjustment is first performed according to the situation. At this time, only two fingers are needed to buckle the two ends of the operating member 64, and the operating member 64 is lifted upward, and the third elastic member 65 is further compressed, and the linkage member 63, the synchronous member 66 and the positioning strip 67 are driven to move until all the positioning strips 67 are separated from the limiting groove 61. After that, the clamping arm 6, the adjusting seat 59 and the transition seat 60 can be directly moved along the length direction of the adjusting member 5. When the approximate position of the clamping portion 8c reaches a suitable position at this time, the operating member 64 is released, and the positioning strip 67 can be inserted into the limiting groove 61 under the elastic force of the third elastic member 65, so that the approximate position adjustment of the adjusting seat 59 is completed. In actual use, if the positioning strip 67 is not well aligned with the limiting groove 61, it is only necessary to adjust the position of the adjusting seat 59 (this adjustment is only a rough adjustment and does not need to be very precise).

[0126] Then the worker manually rotates the second disc 48 and separates the second disc 48 from the clamping arm 6. At this time, the third disc 50 and the first disc 46 are separated from the clamping arm 6, so that the first threaded portion 8a can be directly moved along the length direction of the first threaded portion 8a until the position of the clamping portion 8c is suitable, and then the second disc 48 and the first disc 46 are rotated to make the first disc 46 and the third disc 50 abut against both sides of the clamping arm 6; finally, the fastener 51 is fastened to the first threaded barrel from the side of the clamping arm 6. 45 and the outer wall of the extension tube 49, at this time, the inner wall of the fastener 51 can limit the first disk portion 46 and the third disk portion 50. Since the rotation directions of the first threaded portion 8a and the second threaded portion 8b are opposite, when the positions of the first disk portion 46 and the third disk portion 50 are fixed, the position between the first threaded portion 8a and the clamping arm 6 can be fully fixed, that is, no matter how it is used later, the clamping portion 8c and the clamping arm 6 remain relatively stationary, thereby ensuring the clamping stability of the workpiece.

[0127] At the same time, since the first fastening portion 54 and the second fastening portion 55 are triangular in shape, when the fastening member 51 is fastened to the first threaded tube 45 and the extension tube 49, the first plate portion 46 can act on the inner side of the first fastening portion 54, and the third plate portion 50 can act on the inner side of the second fastening portion 55, and both drive the fastening member 51 outward to elastically deform, so that the fastening member 51 can easily pass over the first plate portion 46 and the third plate portion 50; at the same time, the first fitting groove 56 and the second fitting groove 57 are respectively fitted on the outer edges of the first plate portion 46 and the third plate portion 50, so as to improve or ensure the position stability of the fastening member 51. At the same time, since the first engaging groove 52 is engaged on the first threaded tube 45 and the second engaging groove 53 is engaged on the extension tube 49, the fastening member 51 will not fall off.

[0128] Therefore, by combining the above large-range adjustment and small-range adjustment, the position adjustment range of the clamping portion 8c can be wider, and the stability after adjustment is extremely high, and the position will not move. The first threaded portion 8a is relatively long, and it always passes through the adjustment hole 7, and the second threaded barrel 47 does not act on the first threaded portion 8a. In actual production, the second threaded barrel 47 needs to be firstly threadedly connected to the second threaded portion 8b, and then the clamping portion 8c and the second threaded portion 8b are fixedly connected by welding or other methods.

[0129] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A positioning system, characterized in that: include: A rotating frame (1) is fixed in position, a rotating shaft (2) is arranged on the rotating frame (1) for horizontal rotation, a rotating plate (3) is arranged at one end of the rotating shaft (2), a motor (4) is arranged on the rotating frame (1) for driving the rotating shaft (2) to rotate, and the length direction of the rotating plate (3) is the X direction; An adjusting member (5), the adjusting member (5) being movably sleeved on the rotating plate (3), and the adjusting member (5) being movable along the X direction, and a plurality of the adjusting members (5) being arranged on the rotating plate (3); A first positioning mechanism, the first positioning mechanism being used to fix the position of the adjusting member (5); A clamping arm (6), each of the adjusting members (5) is provided with a clamping arm (6), and the clamping arm (6) is perpendicular to the adjusting member (5), and a plurality of adjusting holes (7) are formed through the clamping arm (6), and the minimum distances between different adjusting holes (7) and the adjusting member (5) are different; A clamping column (8), each of the clamping arms (6) is provided with the clamping column (8), and the clamping column (8) is perpendicular to the clamping arm (6), and the clamping column (8) can pass through any of the adjustment holes (7).

2. A positioning system according to claim 1, characterized in that: The invention also comprises a fixing frame (9), a fixing platform (10) being horizontally arranged on the top of the fixing frame (9), a supporting platform (11) being detachably arranged on the top of the fixing platform (10), a profiling groove (12) being provided on the top of the supporting platform (11), the profiling groove (12) being used for engaging a workpiece to be welded, and the pressing column (8) can be made to contact the top of the workpiece when the rotating plate (3) rotates.

3. A positioning system according to claim 1 or 2, characterized in that: The adjusting member (5) is annular, and the inner wall of the adjusting member (5) is movably fitted to the rotating plate (3). Both sides of the rotating plate (3) are provided with long strip-shaped adjusting grooves (13). The length direction of the adjusting groove (13) is the X direction, and the longitudinal section of the adjusting groove (13) is rectangular. The first positioning mechanism includes two positioning units, and the two positioning units are located at two ends of the adjusting member (5). The positioning units include: A reset plate (14), the reset plate (14) being movably located in the adjustment groove (13), and the reset plate (14) being connected to the inner wall of the adjustment member (5); A spreading piece (15), wherein the top and bottom of the spreading piece (15) on a side facing away from the reset plate (14) are both provided with spreading grooves (16), the top and bottom of the spreading piece (15) are both movably fitted to the inner wall of the adjustment groove (13), and the depth of the spreading groove (16) increases as the distance from the reset plate (14) increases; An adjusting mechanism, the adjusting mechanism being used to adjust the position of the spreading member (15) and to make the spreading member (15) approach or move away from the resetting plate (14); a return spring (17), one end of the return spring (17) being connected to the return plate (14), and the other end of the return spring (17) being connected to the expansion member (15); A linkage frame (18), one end of the linkage frame (18) is connected to the inner wall of the adjusting member (5), and two support frames (19) are arranged opposite to each other on the side, and two vertical holes (20) are provided on the support frames (19), and the ends of the vertical holes (20) away from the linkage frame (18) are connected to each other and are provided with inclined holes (21) in an inclined shape, and the distance between the free end of the inclined hole (21) and the reset plate (14) is smaller than the distance between the vertical hole (20) and the reset plate (14); A locking column (22), wherein both ends of the locking column (22) are coaxially provided with locking portions (23), the diameter of the locking portion (23) is smaller than the diameter of the locking column (22), the locking portion (23) is movably located in the vertical hole (20) or the oblique hole (21), and the diameter of the locking portion (23) is equal to the width of the vertical hole (20) and the width of the oblique hole (21); A first elastic member (24), wherein the first elastic member (24) is continuously in an extended state, and two ends of the first elastic member (24) are respectively connected to the two locking portions (23) on the same side; The locking column (22) includes a locking state and an unlocking state; When the locking column (22) is in the locking state, the outer side of the locking column (22) is in contact with the inner wall of the adjusting groove (13) and the inner wall of the expansion groove (16), and the locking portion (23) is located at the outer end of the vertical hole (20) or inside the oblique hole (21) or at the connection between the vertical hole (20) and the oblique hole (21); When the locking column (22) is in the unlocked state, the locking portion (23) is located at the inner end of the vertical hole (20), and the end of the expansion member (15) facing away from the reset plate (14) is directly between the two locking columns (22); The locking column (22) in one of the positioning units is located on the -X side of the corresponding reset plate (14), and the locking column (22) in the other positioning unit is located on the X side of the corresponding reset plate (14).

4. A positioning system according to claim 3, characterized in that: The top and bottom of the expansion member (15) are both provided with guide parts (25), a guide groove (26) is provided in the adjustment groove (13), the guide part (25) is movably fitted to the inner wall of the guide groove (26), two first elastic members (24) are provided, the two expansion frames (19) are both located between the two first elastic members (24), and the two ends of the locking column (22) are movably fitted to the inner side of the expansion frame (19); The top and bottom of the reset plate (14) are both horizontally provided with a stop plate (27), and when the locking column (22) is in the unlocked state, the expansion member (15) abuts against the stop plate (27).

5. A positioning system according to claim 3, characterized in that: A driving groove (28) is provided on the outer side of the propping member (15), and the depth of the driving groove (28) decreases as the distance from the reset plate (14) increases; The regulating mechanism comprises: An adjustment frame (29), the adjustment frame (29) is U-shaped, and both ends of the adjustment frame (29) are connected to the outer side of the adjustment member (5), and a positioning rod (30) is hingedly provided in the middle of the adjustment frame (29); A telescopic cylinder (31), wherein the telescopic cylinder (31) is horizontally arranged on the outer wall of the adjusting member (5); A telescopic column (32), wherein the longitudinal section of the telescopic column (32) is rectangular, the outer wall of the telescopic column (32) is movably fitted to the inner wall of the telescopic cylinder (31), and the telescopic column (32) movably passes through the adjusting member (5), and a driving wheel (33) is rotatably provided at the inner end of the telescopic column (32), and the driving wheel (33) movably contacts the inner wall of the driving groove (28), and when the locking column (22) is in the locking state, the straight line where the telescopic column (32) is located is colinear with the straight line where the positioning rod (30) is located, and a second positioning mechanism for fixing the angle of the positioning rod (30) is provided on the adjusting frame (29).

6. A positioning system according to claim 5, characterized in that: The second positioning mechanism comprises a T-shaped positioning portion (34) arranged at the top of the positioning rod (30); a movable seat (35) is arranged at the top of one end of the adjustment frame (29); both sides of the movable seat (35) are provided with movable grooves (36) running through the two ends of the movable seat (35); a positioning member (37) is horizontally and movably sleeved on the movable seat (35); the longitudinal section of the positioning member (37) is in a U-shape with an opening downward; a movable bar (38) is arranged on the inner wall of the positioning member (37); the movable bar (38) is movably engaged with the movable groove (36); a second elastic member (39) is arranged between the positioning member (37) and the outer side of the adjustment member (5); the bottom of the positioning portion (34) contacts the adjustment frame (29), and the top contacts the positioning member (37); the second elastic member (39) is at its original length.

7. A positioning system according to claim 6, characterized in that: An inclined driving inclined plate (40) is arranged on a side of the positioning member (37) away from the adjusting member (5), and an anti-slip plate (41) is arranged on a side close to the adjusting member (5), wherein the anti-slip plate (41) is connected to the second elastic member (39). When the positioning portion (34) rotates toward the adjusting frame (29), the positioning portion (34) can act on the upper side of the driving inclined plate (40), drive the positioning member (37) to move toward the adjusting member (5), and compress the second elastic member (39); An unlocking handle (42) is arranged at the top of the positioning member (37), a vertical portion (43) perpendicular to the telescopic column (32) is arranged at the outer top of the telescopic column (32), and a drag reduction ball (44) is rotatably arranged at the free end of the positioning rod (30).

8. A positioning system according to claim 1, characterized in that: The clamping column (8) comprises a first threaded portion (8a), a second threaded portion (8b) and a clamping portion (8c) which are connected in sequence. The first threaded portion (8a) and the second threaded portion (8b) have opposite rotation directions. The first threaded portion (8a) is movable through the adjustment hole (7). The inner wall of the adjustment hole (7) is smooth. A first threaded barrel (45) is threadedly connected to the first threaded portion (8a). A first disk portion (46) is disposed on the outer side of the end of the first threaded barrel (45). A second threaded barrel (46) is threadedly connected to the second threaded portion (8b). A threaded barrel (47), a second disc portion (48) is provided on the outer wall of one end of the second threaded barrel (47) away from the first threaded barrel (45), a cylindrical extension barrel (49) is provided on the side of the second disc portion (48) close to the first disc portion (46), a free end of the extension barrel (49) is located between the first threaded barrel (45) and the second threaded barrel (47), a third disc portion (50) is provided on the outer side of the free end of the extension barrel (49), and the first disc portion (46) and the third disc portion (50) are attached to both sides of the clamping arm (6); The invention also comprises a buckling piece (51) with a U-shaped cross section, wherein the buckling piece (51) is made of elastic material, one end of the buckling piece (51) is provided with a first buckling groove (52) for the first threaded tube (45) to be snapped in, and the other end is provided with a second buckling groove (53) for the extension tube (49) to be snapped in, the first disc portion (46) and the third disc portion (50) are respectively attached to the inner walls on both sides of the buckling piece (51), the inner wall of one end of the buckling piece (51) is provided with a first buckling portion (54), and the inner wall of the other end is provided with a second buckling portion (53). A second buckling portion (55) is provided on the inner wall of the end, the cross-sections of the first buckling portion (54) and the second buckling portion (55) are both triangular, the inner ends of the two first buckling portions (54) on the side close to each other are each provided with a first fitting groove (56), the first fitting groove (56) is fitted to the outer edge of the first plate portion (46), and the inner ends of the two second buckling portions (55) on the side close to each other are each provided with a second fitting groove (57), the second fitting groove (57) is fitted to the outer edge of the third plate portion (50); When the fastening member (51) moves toward the corresponding clamping arm (6), the first disk portion (46) acts on the inner side surface of the first fitting portion and drives one side of the fastening member (51) to elastically deform outward, and the third disk portion (50) acts on the inner side surface of the second fitting portion and drives the other side of the fastening member (51) to elastically deform outward.

9. A positioning system according to claim 8, characterized in that: Two adjustment rails (58) are arranged on both sides of the top of the adjustment member (5) facing each other, and the two ends of the adjustment rails (58) are flush with the two ends of the adjustment member (5). The cross-section of the adjustment rails (58) is L-shaped, and an adjustment groove (13) with a convex cross-section is formed between the two adjustment rails (58) and the outer side of the adjustment member (5). An adjustment seat (59) matched with the adjustment groove (13) is movably arranged in the adjustment groove (13). A transition seat (60) is arranged at the outer end of the adjustment seat (59). The periphery of one end of the adjustment seat (59) connected to the transition seat (60) is located on the inner side of the edge of the transition seat (60). The end of the clamping arm (6) is fixedly connected to the transition seat (60). A plurality of triangular limiting grooves (61) are opened at one end of the adjustment rail (58) away from the adjustment member (5); A through hole (62) is provided horizontally through the transition seat (60), and two linkage holes are provided on a side of the through hole (62) close to the adjustment seat (59), and a linkage member (63) is movably provided in the linkage hole, and an operating member (64) is provided between the tops of the two linkage members (63), and both ends of the operating member (64) are movably located outside the through hole (62), and a third elastic member (65) which is continuously in a compressed state is provided between the top of the operating member (64) and the inner wall of the through hole (62); A synchronous member (66) is horizontally arranged at one end of the linkage member (63) away from the operating member (64), and a plurality of positioning strips (67) are vertically arranged at the bottom of the synchronous member (66), and each of the positioning strips (67) can be inserted into any of the limiting grooves (61).

10. An ultrasonic welding method using a positioning system as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: S1, selecting the number of adjusting members (5) required to be used according to the shape of the workpiece, and moving the adjusting members (5) required to be used to corresponding positions on the rotating plate (3), and fixing the positions of the adjusting members (5) by a first positioning mechanism; S2, selecting the adjustment hole (7) where the pressing column (8) is located according to the shape of the workpiece; S3, assembling the two workpieces to be welded together and placing them in corresponding positions; S4, the motor (4) drives the rotating shaft (2) to rotate, and the rotating shaft (2) drives the rotating plate (3) to rotate, so that all the pressing columns (8) are pressed at the set position of the workpiece; S5, the robot moves the ultrasonic welding head and applies the ultrasonic welding head to the specified position of the workpiece; S6, after the ultrasonic welding is completed, the motor (4) drives the rotating shaft (2) to rotate, so that all the pressing columns (8) are separated from the workpiece, waiting for the next time to press the workpiece.

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