Ultrasonic tool bit with bridle

Abstract

The technical scheme belongs to the technical field of bridle machine tool bits, and particularly relates to a bridle ultrasonic tool bit which comprises a machine core frame, a mounting seat arranged on the inner side of the machine core frame and a tool assembly, the tool assembly sequentially comprises a rear tool, a welding tool, a cutting tool and a front tool, and the rear tool, the front tool and the cutting tool are all movably arranged relative to the machine core frame. The welding knife is connected to the mounting seat in a sliding manner and can stretch up and down relative to the mounting seat; a driving mechanism I and a driving mechanism II are also arranged on the machine core frame; the driving mechanism I independently controls the front cutter to lift up and down; the driving mechanism II simultaneously controls the rear cutter and the welding cutter to lift up and down; the upper end of the rear knife is used for abutting against the bridle. The cutter is used for cutting off the bridle; the welding knife is used for welding the bridle; after the cutter cuts off the bridle, the first driving mechanism independently controls the front cutter to descend and enables a receding cavity to be formed between the upper end of the front cutter and the bridle; after the abdicating cavity is formed, the welding knife welds the laminated bridle, and the tail end of the bridle is brought into the abdicating cavity, so that the bundling is smoother, and the packaging quality is improved.

Description

Technical Field

[0001] The present technical solution relates to the technical field of cutter heads for banding machines, and in particular to an ultrasonic cutter head for banding machines. Background Art

[0002] The strapping machine is a kind of packaging equipment that can be used to automatically pack and tie items. The straps are used to bundle the items. The packaging equipment is equipped with a three-knife assembly to tighten, weld and cut the wound straps, which are performed in sequence by the front knife, cutting knife and welding knife in the three-knife assembly.

[0003] For example, Chinese patent CN204773573U discloses a three-knife assembly structure of an ultrasonic banding machine, including a workbench, on which a front knife, a cutting knife, and a welding knife are arranged in sequence. The workbench is provided with a longitudinal through hole, and the welding knife extends into the through hole from the bottom of the workbench, and the welding knife head extends out of the through hole. The welding knife is movably connected to the workbench and can move up and down relative to the workbench, so that it slides relative to the front knife and the cutting knife. The welding knife generates high-frequency vibration through a high-frequency vibration generating device to rub the surface of the band.

[0004] The above-mentioned ultrasonic banding machine welding knife structure adopts ultrasonic welding, and its working principle is to use a transducer to convert electrical energy into mechanical energy of corresponding frequency. After the high-frequency vibration wave is transmitted to the surface of the packaging film to be welded, under pressure, the joints of the packaging film are rubbed against each other, so that the molecules at the joints of the packaging film penetrate each other and are welded together.

[0005] In the existing three-knife assembly structure, the front knife and the cutting knife are relatively fixed on the workbench, and the welding knife (ultrasonic knife head) is used in a relatively sliding manner. There is also a structure in which the front knife, the rear knife, the cutting knife and the welding knife are all fixed in use. After the strap is superimposed, the operation of cutting first and then welding is performed. During welding, the front knife cannot be retracted, which will cause obstruction, resulting in the curling of the end of the strap that has completed the welding, affecting the final forming, which needs to be improved. Summary of the invention

[0006] In order to improve the problem that the front knife cannot be retracted independently, resulting in the curling of the end of the strap during welding, the present technical solution provides an ultrasonic knife head for the strap.

[0007] The purpose of this technical solution is achieved in this way:

[0008] A belted ultrasonic cutter head comprises a core frame, a mounting seat arranged inside the core frame and a cutter assembly, wherein the cutter assembly comprises a rear cutter, a welding cutter, a cutting cutter and a front cutter in sequence, wherein the rear cutter, the front cutter and the cutting cutter are all movably arranged relative to the core frame, and the welding cutter is slidably connected to the mounting seat and can be extended and retracted up and down relative to the mounting seat.

[0009] The movement frame is also provided with a driving mechanism 1 and a driving mechanism 2;

[0010] The driving mechanism 1 independently controls the up and down movement of the front knife;

[0011] The second driving mechanism controls the lifting and lowering of the rear knife and the welding knife simultaneously;

[0012] The upper end of the rear knife is used to tighten the strap;

[0013] The cutter is used to cut the strap;

[0014] The welding knife is used for welding the strap;

[0015] After the cutter cuts the band, the driving mechanism controls the front knife to descend independently so that a clearance cavity is formed between the upper end of the front knife and the band;

[0016] After the clearance cavity is formed, the welding knife welds the laminated straps.

[0017] Through the above technical scheme, when the ultrasonic blade head of the strap is used normally, the strap is fed in through the front blade and passes through the top of the cutting blade, the welding blade and the rear blade in sequence. After the strap is wrapped around the outside of the object to be packaged, it is stacked with the strap at the feeding position to the top of the rear blade, thereby forming upper and lower layers of straps. At this time, the driving mechanism one drives the front blade to move up and press against the upper strap. After the excess strap is withdrawn and tightened, the driving mechanism two drives the rear blade to move up and press against the stacked strap. The driving mechanism one drives again to make the cutting blade cut the lower strap. After cutting, the front blade is driven downward in the opposite direction to form a clearance cavity between the top of the front blade and the upper strap at its position. At this time, the welding blade generates heat and performs welding operation close to the stacked strap. Based on the existence of the clearance cavity, the end of the strap will be naturally brought into the clearance cavity during welding, so that the strap is bundled more smoothly, which improves the appearance quality of the strap and thus improves the packaging quality.

[0018] Preferably, the driving mechanism 1 comprises a front driving seat, a connecting member 1, a sliding member 1, and a transmission rod 1 arranged on the sliding member 1;

[0019] The movement frame is provided with a limit groove, a transmission rod 1 is located in the limit groove, and the transmission rod 1 moves up and down along the limit groove to drive the sliding member 1 to slide, a connecting member 1 is connected between the front driving seat and the sliding member 1, and a guide rail 1 is installed on the opposite sides of the movement frame corresponding to the sliding member 1, which is used to guide the sliding of the sliding member 1;

[0020] The front knife includes a front knife seat arranged on the front driving seat and a front knife push rod arranged on the front knife seat. A channel for the lower layer of belt to pass through is formed between the front knife push rod and the front knife seat. When the lower layer of belt is fed through the channel, the front driving seat drives the front knife push rod to tighten the upper layer of belt.

[0021] Through the above technical solution, the power source (rotating shaft) on the movement support drives the first transmission rod to repeatedly lift or lower through the cam structure. One end of the first transmission rod passes through the limiting groove and abuts against the cam structure. The limiting groove can standardize the movement range and space of the first transmission rod. The other end of the first transmission rod is connected to the first slider, so as to drive the first slider to move synchronously. A first connecting piece is also fixed on the other side of the first slider. Based on the connection of the first connecting piece between the first slider and the front driving seat, the first connecting piece can drive the front knife to move, so as to realize the independent operation of the front knife.

[0022] Two first guide rails are arranged on both sides of the first slider to guide its movement, provide movement stability and achieve precise control. The channel between the front knife abutting rod and the front knife seat is for the lower layer of the strap to pass through. When the driving seat drives it to move upward, the front knife seat approaches the front knife abutting plate to tightly abut the lower layer of the strap, so as to position the imported lower layer of the strap, facilitating the cutting knife to cut.

[0023] Preferably, the second driving mechanism includes a second slider, the rear knife is arranged on the second slider, and the mounting seat is connected to the second slider;

[0024] An installation groove one is opened on the second slider close to the mounting seat, and an installation groove two is arranged at the corresponding position of the mounting seat. The installation groove one and the installation groove two cooperate to allow the welding knife to pass through and realize axial movement.

[0025] Through the above technical solution, the second slider bears the rear knife and allows the rear knife to move in a specific direction. The openings of the installation groove one and the installation groove two are coplanar. The openings of the two installation grooves are spliced opposite to each other to form a space adapted to the welding knife, so that the mounting seat and the second slider can be detachably connected by bolts to realize the installation of the welding knife and move freely axially, improving its positioning ability and installation convenience.

[0026] Preferably, the front driving seat is located above the mounting seat, and a relief groove is opened on the front driving seat corresponding to the welding knife.

[0027] Through the above technical solution, the relief groove provides a relief for the welding knife, so that the front driving seat is arranged closer to the mounting seat and can abut against the mounting seat to obtain support, making the layout more optimized and compact.

[0028] Shorten the distance between the front knife and the welding knife to reduce the distance between the cutting position and the welding position of the strap, thereby reducing the margin at the end of the strap and further making the strap bundling quality better.

[0029] Preferably, the front knife abutting rod is slidably connected to the front driving seat, and a first elastic member is further arranged between the front knife abutting rod and the front driving seat, and its elastic force makes the front knife abutting rod tend to move away from the front driving seat relative to the front driving seat;

[0030] The front drive seat is provided with a positioning groove. The front knife abutting rod is provided with a positioning rod passing through the positioning groove. A guide sleeve is sleeved on the upper end of the positioning rod, and the first elastic member is sleeved on the lower end of the positioning rod.

[0031] A limiting block is fixed to one end of the guide rod away from the front knife abutting rod. The limiting block is used to limit the front knife abutting rod from disengaging from the front drive seat.

[0032] Through the above technical solution, the guide rod passes through the guide groove in a sliding fit. The guide rod sleeve is sleeved on the guide rod. The size of the guide rod sleeve is adapted to the gap between the guide groove and the guide rod, avoiding the direct contact between the guide rod (screw rod) and the inner wall of the guide groove during sliding, reducing thread wear. The upper end of the guide rod is fixed to the front knife abutting rod, and a limiting portion is fixed to the other end, thereby restricting the guide rod from disengaging from the guide groove and positioning the guide rod.

[0033] The front knife abutting rod is slidably connected to the front drive seat. The first elastic member abuts against the lower end of the guide sleeve and the front drive seat respectively. The elastic force makes the guide sleeve have a tendency to push the front knife abutting rod away from the front drive seat. When the front knife abutting rod abuts against the binding belt, the first elastic member is compressed to provide elastic yielding for adaptive adjustment, enabling the front knife abutting rod to move flexibly when subjected to an external force and reset when the external force disappears. The elastic force provides a pressing force for the front knife abutting rod against the binding belt and maintains a continuous pressing force, thereby improving the stability of the guiding belt.

[0034] Preferably, the front knife seat and the front knife abutting rod slide relative to each other so as to move closer to each other to tightly press the lower binding belt between the front knife seat and the front knife abutting rod.

[0035] A second elastic member is provided between the front knife seat and the front drive seat. The second elastic member makes the front knife seat and the front drive seat have a tendency to move away from each other.

[0036] The cutting knife is fixed to the front drive seat. A cutting groove is formed in the front knife abutting rod corresponding to the moving direction of the cutting knife for making way for the cutting head of the cutting knife. When the front drive seat slides, it can drive the cutting knife to cut the lower binding belt.

[0037] Through the above technical solution, after the front knife abutting rod abuts, the front drive seat is continuously lifted. During this process, the front knife seat is driven to abut against the lower part of the front knife abutting rod, thereby tightly pressing the lower binding belt between the front knife seat and the front knife abutting rod. Based on the second elastic member provided between the two, the front drive seat compresses the second elastic member to approach the front knife seat, providing a pressing force for the front knife seat against the binding belt through the elastic force and continuously applying the pressing force, improving the positioning effect of the binding belt.

[0038] At this time, the cutting knife moves upward following the front drive seat to cut the binding tape. The top of the cutting knife beyond the cutting action can be accommodated in the cutting groove, avoiding the collision of the top of the cutting knife with the front knife abutting rod, playing a protective role, and thus improving the safety of operation.

[0039] Preferably, a high-frequency vibration generating device is provided at the bottom of the welding knife, and an elastic shock-absorbing assembly is provided between the welding knife and the mounting seat.

[0040] Through the above technical solution, the welding knife adopts an ultrasonic tool head, and the temperature is increased through the high-frequency vibration generating device, so that the binding tape interface quickly melts and then fills the gap between the interfaces, thereby completing the welding. When the welding knife is subjected to an impact force, a large impact force and vibration are generated, and these energies are absorbed and dispersed by the elastic shock-absorbing assembly, alleviating the vibration amplitude, thereby protecting the equipment and improving the welding stability.

[0041] Preferably, the elastic shock-absorbing assembly includes a fixed sleeve, a return spring and a guide rod. The fixed sleeve is fixed on the tool body of the welding knife;

[0042] The fixed sleeve is provided with a guide groove. The guide rod penetrates through the guide groove. One end of the guide rod passes through the fixed sleeve and is provided with a lower limit portion, and the other end passes through the mounting seat and is provided with an upper limit portion for restricting the sliding of the fixed sleeve and the welding knife between the upper limit portion and the lower limit portion. The return spring is sleeved on the guide rod, and its elastic force acts between the fixed sleeve and the lower limit portion respectively.

[0043] Through the above technical solution, the welding knife operates under high-frequency vibration. The guide rod is guided to slide within a limited range through the guide groove on the fixed sleeve. The upper and lower limit portions at both ends of the guide rod limit the maximum up and down movement distance boundaries of the welding knife and the fixed sleeve. The return spring is sleeved on the guide rod, and the elastic force will offset part of the impact force during welding and provide a return force, so that the welding knife can return smoothly to the initial position after use, preparing for the next welding operation, and thus making the whole process stable and efficient, improving the welding quality and the service life of the equipment.

[0044] Preferably, the second driving mechanism further includes a rear drive seat arranged at the upper end of the second sliding member and a second transmission rod arranged on one side of the second sliding member. The second transmission rod can drive the second sliding member to slide;

[0045] The rear knife is slidably arranged on the rear drive seat, and a third elastic member is arranged between the rear knife and the rear drive seat, and its elastic force makes the rear knife and the rear drive seat tend to move away from each other.

[0046] Through the above technical solution, another power source (rotating shaft) on the movement frame drives the second transmission rod to repeatedly lift or lower through a cam structure. One end of the second transmission rod abuts against the cam structure, and the other end is connected to the second sliding member to drive it to move synchronously. Based on the rear cutter being installed on the second sliding member, the lifting and abutting as well as the landing of the rear cutter are realized.

[0047] The third elastic member is arranged between the rear cutter and the rear driving seat. When the rear cutter presses against the binding belt, the elastic force of the third elastic member continuously acts, causing the rear cutter and the rear driving seat to move away from each other. The elastic force provides a continuous pressing force for pressing against the binding belt, improving the positioning effect of the binding belt. At the same time, it provides elastic yielding for adaptive adjustment to avoid impact damage.

[0048] Preferably, a second connecting member is provided between the second sliding member and the movement frame. The second connecting member is provided with second guide rails on the opposite sides corresponding to the second sliding member one by one for guiding the sliding of the second sliding member.

[0049] Through the above technical solution, one side of the second connecting member is fixed on the movement frame, and the other side is used for the installation and sliding of the second sliding member. The second connecting member provides a space for the cam structure and makes the structure more compact. The two second guide rails are arranged on both sides of the second sliding member to guide its movement, providing movement stability and achieving precise control.

[0050] The prominent and beneficial technical effects of this technical solution compared with the prior art are:

[0051] 1. After the cutting knife executes the action of cutting the binding belt in this technical solution, the first driving mechanism drives the front cutter to descend, forming a yielding cavity between the top end of the front cutter and the upper binding belt at the position. Then, the welding knife performs the welding operation. Based on the existence of the yielding cavity, the end of the binding belt will be naturally brought into the yielding cavity during welding, making the binding of the binding belt more flat, improving the appearance quality of the binding belt, and thus improving the packing quality;

[0052] 2. In this technical solution, the mounting seat is detachably connected to the second sliding member, and the welding knife body is installed in the space formed by the splicing of the first installation groove and the second installation groove, enabling the welding knife to achieve axial movement, improving its positioning ability and installation convenience. Description of the Drawings

[0053] Figure 1 is the overall structural schematic diagram of this embodiment;

[0054] Figure 2 is the partial exploded schematic diagram of this embodiment;

[0055] Figure 3 is the partial cross-sectional schematic diagram of the front cutter in the embodiment;

[0056] Figure 4 is the partial exploded schematic diagram of the first driving mechanism in the embodiment;

[0057] Figure 5 Schematic partial cross-sectional view of the soldering tool in the embodiment;

[0058] Figure 6 Schematic partial exploded view of the soldering tool in the embodiment;

[0059] Figure 7 Schematic partial exploded view of the second driving mechanism in the embodiment.

[0060] Reference numerals: 1, movement frame; 2, mounting base; 3, rear tool; 4, soldering tool; 5, cutting tool; 6, front tool; 61, front tool seat; 62, front tool abutting rod; 7, first driving mechanism; 71, front driving seat; 72, first connecting member; 73, first sliding member; 74, first transmission rod; 8, second driving mechanism; 81, rear driving seat; 82, second sliding member; 83, second transmission rod; 9, limiting groove; 10, first guide rail; 11, first mounting groove; 12, second mounting groove; 13, relief groove; 14, first elastic member; 15, positioning groove; 16, positioning rod; 17, guide sleeve; 18, limiting block; 19, second elastic member; 20, cutting groove; 21, elastic shock absorption assembly; 211, fixed sleeve; 212, return spring; 213, guide rod; 22, guide groove; 23, lower limiting portion; 24, upper limiting portion; 25, third elastic member; 26, second connecting member; 27, second guide rail; 28, relief cavity. Detailed implementation manners

[0061] The following further elaborates in detail on the specific implementation manners of the present technical solution in conjunction with the accompanying drawings.

[0062] Embodiment:

[0063] Refer to Figure 1 , an ultrasonic tool head for a strap, including a movement frame 1, with a tool assembly arranged inside the movement frame 1. The tool assembly successively includes a rear tool 3, a soldering tool 4, a cutting tool 5, and a front tool 6. The rear tool 3, the front tool 6, and the cutting tool 5 are all movably arranged relative to the movement frame 1. In this embodiment, the situation where two rotating shafts penetrate through opposite sides of the movement frame 1 and a cam mechanism rotating shaft arranged on the corresponding rotating shaft is shown. The driving rotating shaft drives the cam mechanism to rotate synchronously. The up-and-down lifting of the rear tool 3 and the soldering tool 4 is driven by one corresponding cam mechanism, and the up-and-down lifting of the cutting tool 5 and the front tool 6 is driven by the other cam mechanism. A relief cavity 28 is left between the upper end of the front tool 6 and the strap.

[0064] Refer to Figure 2 and Figure 4, a driving mechanism I (7) is provided on the movement mechanism frame (1). The driving mechanism I (7) independently controls the up-and-down movement of the front cutter (6). The driving mechanism I (7) includes a front driving seat (71), a connecting member I (72), a sliding member I (73), and a transmission rod I (74). A limiting groove (9) is formed in the movement mechanism frame (1) at a position corresponding to the transmission rod I (74). The length direction of the limiting groove (9) is vertically arranged along the moving direction of the front cutter (6). The transmission rod I (74) is located in the limiting groove (9). One end of the transmission rod abuts against the cam mechanism, and the other end passes through the limiting groove (9) and is fixed on the sliding member I (73), so as to drive the sliding member I (73) to synchronously slide. On one side of the movement mechanism frame (1) close to the sliding member I (73), two guide rails I (10) are installed. The two guide rails I (10) are arranged corresponding to the opposite sides of the sliding member I (73). The space formed between the two guide rails I (10) is adapted to the sliding member I (73). In this embodiment, the opposite end faces of the two shown guide rails I (10) are both provided with guide grooves. One side wall of the guide groove is an inclined side wall. The inclined direction of the inclined side wall is such that the width of the guide groove expands towards the notch end. The part of the sliding member I (73) embedded in the guide groove has an inclined surface adapted to the inclined side wall. The sliding member I (73) is inserted between the two guide rails I (10) from above. The inclined surface fits the inclined side wall, and the other side wall correspondingly fits the corresponding side wall in the guide groove, for guiding the sliding of the sliding member I (73).

[0065] The connecting member I (72) is located between the front driving seat (71) and the sliding member I (73) and is fixed to both of them respectively, so that the sliding member I (73) drives the connecting member I (72) to move, and then drives the front driving seat (71) to move. An installation seat (2) is further provided inside the movement mechanism frame (1). The position of the front driving seat (71) in the vertical direction is above the installation seat (2). A relief groove (13) adapted to the welding cutter (4) is formed on one side of the sliding member I (73) close to the welding cutter (4).

[0066] The cutting cutter (5) is fixed to the front driving seat (71) by bolts and is located on the side of the front driving seat (71) close to the welding cutter (4).

[0067] See Figure 3 and Figure 4 , the front cutter (6) includes a front cutter seat (61) and a front cutter abutting rod (62). The front cutter seat (61) and the front cutter abutting rod (62) are both slidably arranged on the front driving seat (71). Their sliding directions are parallel to each other, and the front cutter seat (61) and the front cutter abutting rod (62) slide relative to each other. The front cutter seat (61) is located above the front driving seat (71). The front cutter abutting rod (62) is erected above the front cutter seat (61). A channel is formed between the front cutter abutting rod (62) and the front cutter seat (61) for the belt to be introduced through.

[0068] The front drive seat 71 is provided with positioning grooves 15. There are two positioning grooves 15, and the two positioning grooves 15 are arranged on the opposite sides of the front drive seat 71 in a one-to-one correspondence. The length direction of each positioning groove 15 is set vertically. A positioning rod 16 is inserted into each positioning groove 15. The upper end of the positioning rod 16 is connected to the front knife abutting rod 62, and the other end has a limit block 18. The limit block 18 restricts the positioning rod 16 from detaching from the upper opening of the positioning groove 15. Each positioning rod 16 is also sleeved with a guide sleeve 17. The guide sleeve 17 is sleeved on the upper end of the positioning rod 16 and is located between the positioning rod 16 and the inner wall of the positioning groove 15, which is used to reduce the collision and wear between the positioning rod 16 and the inner wall.

[0069] A first elastic member 14 is provided between the front knife abutting rod 62 and the front drive seat 71. The first elastic member 14 is a spring. There are two first elastic members 14, and the two first elastic members 14 are arranged in a one-to-one correspondence with the two positioning rods 16. The corresponding first elastic member 14 is sleeved on the lower end of the positioning rod 16 and is located below the guide sleeve 17. Its upper end abuts against the lower end face of the guide sleeve 17, and the other end abuts against the front drive seat 71. The elastic force makes the front knife abutting rod 62 have a tendency to lift away from the front drive seat 71.

[0070] There are two second elastic members 19 between the front knife seat 61 and the front drive seat 71. The second elastic member 19 is a spring. One end of the second elastic member 19 is connected to the lower end of the front knife seat 61, and the other end is embedded in the front drive seat 71. The elastic force makes the front knife seat 61 and the front drive seat 71 have a tendency to move away from each other. When the sliding member approaches to tightly press the lower layer of the strap between the front knife seat 61 and the front knife abutting rod 62, the first elastic member 14 and the second elastic member 19 are compressed so that the cutter 5 passes through the channel, so that the cutter 5 cuts the strap at the channel. A cutting groove 20 is opened on the lower end face of the front knife abutting rod 62 corresponding to the moving direction of the cutter 5. After the cutter 5 cuts, the cutting head of the cutter 3 is embedded in the cutting groove 20, which is used to provide a space to avoid collision with the front knife abutting rod 62.

[0071] See Figure 2 and Figure 7 As shown in and, a second driving mechanism 8 is further provided on the movement frame 1. The second driving mechanism 8 simultaneously controls the up and down lifting of the rear knife 3 and the welding knife 4. The second driving mechanism 8 includes a rear drive seat 81, a sliding member two 82 and a transmission rod two 83. One end of the transmission rod two 83 abuts against another cam mechanism, and the other end is fixed on the sliding member two 82, so as to drive the sliding member two 82 to slide synchronously.

[0072] The movement frame 1 is provided with a connecting member 26, which is fixedly connected between the sliding member 82 and the movement frame 1. Two guide rails 27 are installed on the end surface of the connecting member 26 close to the sliding member 82. The two guide rails 27 are arranged one by one corresponding to the opposite sides of the sliding member 82. The space formed between the two guide rails 27 is adapted to the sliding member 82. This embodiment shows that the structure of the guide rail 27 is similar to that of the guide rail 10. The sliding member 82 is embedded between the two guide rails 27 from above, and the two guide rails 27 cooperate to achieve guided sliding.

[0073] The rear driving seat 81 is arranged on the sliding member 82, and the rear knife 3 is arranged above the rear driving seat 81. The rear knife 3 slides relative to the rear driving seat 81. Two third elastic members 25 are arranged between the rear knife 3 and the rear driving seat 81. The third elastic member 25 adopts a spring. One end of the third elastic member 25 is connected to the lower end of the rear knife 3, and the other end is embedded in the rear driving seat 81. The elastic force makes the rear knife 3 and the rear driving seat 81 tend to move away from each other.

[0074] The end surface of the sliding member 82 near the mounting seat 2 is provided with a mounting groove 11, and the mounting groove 11 is adapted to the welding knife 4. Figure 6 As shown, a second mounting groove 12 is provided at the corresponding position of the fixing seat, and the first mounting groove 11 and the second mounting groove 12 are spliced ​​to form a clearance space, which is adapted to the blade body of the welding knife 4, so that when the mounting seat 2 is bolted to the second sliding member 82, the welding knife 4 is embedded in the mounting grooves on both sides for positioning, thereby realizing its axial movement.

[0075] See also Figure 5 and Figure 6 The welding knife 4 adopts an ultrasonic knife head. The welding knife 4 is slidably connected in the mounting seat 2 and extends up and down relative to the mounting seat 2. A high-frequency vibration generating device is provided at the bottom of the welding knife 4. The high-frequency vibration generating device is a prior art and will not be described here. The temperature is increased through the high-frequency vibration generating device, the strap interface is quickly melted, and then the gap between the interfaces is filled to complete the welding.

[0076] An elastic shock-absorbing component 21 is provided between the welding knife 4 and the mounting seat 2. The elastic shock-absorbing component 21 includes a fixing sleeve 211, a reset spring 212 and a guide rod 213. The fixing sleeve 211 is fixed on the knife body of the welding knife 4. Two guide rods 213 are provided. The two guide rods 213 pass through the fixing sleeve 211 and the opposite sides of the mounting seat 2 one by one. Each guide rod 213 passes through the upper end of the mounting seat 2 and is provided with an upper limit portion 24. The lower end of the guide rod 213 passing through the fixing sleeve 211 is also provided with a lower limit portion 23. The upper limit portion 24 cooperates with the lower limit portion 23 to limit the fixing sleeve 211 and the welding knife 4 from sliding between the upper limit portion 24 and the lower limit portion 23. The reset spring 212 is sleeved on the guide rod 213, and the reset spring 212 is located between the lower limit portion 23 and the fixing sleeve 211, so that the structure is compact and easy to assemble. The lower limit portion 23 and the guide rod 213 can be integrally arranged and made into the form of a long bolt.

[0077] The upper limit portion 24 is threadedly connected to the guide rod 213 to adjust the tightness of the spring. The adjustable tightness of the reset spring 212 can meet the needs of different working conditions. If the reset spring 212 is loosened, the up and down vibration amplitude of the welding knife 4 becomes larger, and vice versa. However, if it is too small, it will not have a shock absorbing effect, and if it is too large, the noise will be severe. The upper limit portion 24 can be adjusted to a reasonable choice, and the upper limit portion 24 can be made in the form of a nut.

[0078] When the strap is introduced, the strap passes through the channel between the front knife push rod 62 and the front knife seat 61, and passes over the welding knife 4 and the top of the rear knife 3 in turn. After the strap wraps around the strap frame for one circle, the initial end is superimposed on the strap at the introduction point to form stacked upper and lower layers of straps. The front knife 6 is driven so that the front knife push rod 62 presses the upper layer of strap against the object to be packaged. At this time, the excess strap is withdrawn and tightened. The rear knife 3 is driven to press against the stacked strap. Before driving, the driving seat 71 is driven so that the cutter 5 cuts the strap. The driving mechanism 7 drives the front knife 6 to descend and retreat, so that a clearance cavity 28 is formed between the upper end of the front knife 6 and the strap. After the clearance cavity 28 is formed, the welding knife 4 welds the stacked strap. Based on the fact that the strap has certain toughness and elasticity, the excess strap at the end will be brought into the clearance cavity 28, making the strapping more fitting and neat.

[0079] The specific working process of this program is as follows:

[0080] The present technical solution forms upper and lower layers of straps by wrapping the strap around the object to be packaged and stacking it with the strap at the feeding position above the rear knife 3. At this time, the driving mechanism 1 7 drives the front knife 6 to move upward and press against the upper layer of strap. After the excess strap is withdrawn and tightened, the driving mechanism 2 8 drives the rear knife 3 to move upward and press against the stacked strap. The driving mechanism 1 7 drives again to cause the cutter 5 to cut the lower layer of strap. After cutting, the front knife 6 is driven downward in the reverse direction to form a clearance cavity 28 between the top end of the front knife 6 and the upper layer of strap at the location. At this time, the welding knife 4 generates heat and performs welding operation close to the stacked strap. Based on the existence of the clearance cavity 28, the end of the strap will be naturally brought into the clearance cavity 28 during welding, so that the strapping is smoother, the appearance quality of the strap is improved, and thus the packaging quality is improved.

[0081] The above shows and describes the basic principle and main features of the technical solution and the advantages of the technical solution. The technicians in this industry should understand that the technical solution is not limited by the above embodiments. The above embodiments and the description are only to illustrate the principle of the technical solution. Without departing from the spirit and scope of the technical solution, the technical solution will have various changes and improvements, which fall within the scope of the technical solution to be protected. The scope of protection claimed by the technical solution is defined by the attached claims and their equivalents.

Claims

1. A belted ultrasonic cutter head, comprising a core frame (1), a mounting seat (2) arranged on the inner side of the core frame (1), and a cutter assembly, wherein the cutter assembly comprises a rear cutter (3), a welding cutter (4), a cutting cutter (5), and a front cutter (6) in sequence, wherein the rear cutter (3), the front cutter (6), and the cutting cutter (5) are all movably arranged relative to the core frame (1), and the welding cutter (4) is slidably connected to the mounting seat (2) and can be extended and retracted up and down relative to the mounting seat (2), characterized in that: The movement frame (1) is also provided with a driving mechanism 1 (7) and a driving mechanism 2 (8); The driving mechanism 1 (7) independently controls the up and down movement of the front knife (6); The second driving mechanism (8) simultaneously controls the upward and downward movement of the rear knife (3) and the welding knife (4); The upper end of the rear knife (3) is used to tighten the strap; The cutter (5) is used to cut the strap; The welding knife (4) is used for welding the strap; After the cutter (5) cuts the belt, the driving mechanism (7) controls the front knife (6) to descend independently so that a clearance cavity (28) is formed between the upper end of the front knife (6) and the belt; After the clearance cavity (28) is formed, the welding knife (4) welds the laminated straps.

2. The ultrasonic knife head of the cincture according to claim 1, characterized in that: The driving mechanism 1 (7) comprises a front driving seat (71), a connecting member 1 (72), a sliding member 1 (73) and a transmission rod 1 (74) arranged on the sliding member 1 (73); The movement frame (1) is provided with a limit groove (9), a transmission rod (74) is located in the limit groove (9), the transmission rod (74) moves up and down along the limit groove (9) to drive the sliding member (73) to slide, a connecting member (72) is connected between the front driving seat (71) and the sliding member (73), and guide rails (10) are installed on opposite sides of the movement frame (1) corresponding to the sliding member (73) one by one, for guiding the sliding of the sliding member (73); The front knife (6) comprises a front knife seat (61) arranged on the front driving seat (71) and a front knife push rod (62) arranged on the front knife seat (61); a channel for the lower layer belt to pass through is formed between the front knife push rod (62) and the front knife seat (61); when the lower layer belt passes through the channel for supplying the belt, the front driving seat (71) drives the front knife push rod (62) to tighten the upper layer belt.

3. The ultrasonic knife head of the girdle according to claim 1, characterized in that: The second driving mechanism (8) comprises a second sliding member (82), the rear knife (3) is arranged on the second sliding member (82), and the mounting seat (2) is connected to the second sliding member (82); The second sliding member (82) is provided with a mounting groove (11) near the mounting seat (2), and the mounting seat (2) is provided with a mounting groove (12) at a corresponding position. The mounting groove (11) and the mounting groove (12) cooperate to allow the welding knife (4) to pass through and realize axial movement.

4. The ultrasonic knife head of the girdle according to claim 2, wherein: The front driving seat (71) is located above the mounting seat (2), and a clearance groove (13) is provided in the front driving seat (71) corresponding to the welding knife (4).

5. The ultrasonic knife head of the girdle according to claim 2, characterized in that: The front tool pressing rod (62) is slidably connected to the front drive seat (71), and a first elastic member (14) is further provided between the front tool pressing rod (62) and the front drive seat (71), and its elastic force causes the front tool pressing rod (62) to have a tendency to move away from the front drive seat (71); The front drive seat (71) is provided with a positioning groove (15), the front tool pressing rod (62) is provided with a positioning rod (16) passing through the positioning groove (15), a guide sleeve (17) is sleeved on the upper end of the positioning rod (16), and the first elastic member (14) is sleeved on the lower end of the positioning rod (16); One end of the positioning rod (16) away from the front tool pressing rod (62) has a limiting block (18) for restricting the front tool pressing rod (62) from detaching from the front drive seat (71).

6. The ultrasonic knife head of the girdle according to claim 5, wherein: The front tool seat (61) and the front tool pressing rod (62) slide relative to each other so as to move closer to each other to press the lower layer of the strap tightly between the front tool seat (61) and the front tool pressing rod (62); A second elastic member (19) is provided between the front tool seat (61) and the front drive seat (71), and the second elastic member (19) causes the front tool seat (61) and the front drive seat (71) to have a tendency to move away from each other; The cutting tool (5) is fixed on the front drive seat (71), and a cutting groove (20) is formed in the front tool pressing rod (62) corresponding to the moving direction of the cutting tool (5) for making way for the tool head of the cutting tool (5). When the front drive seat (71) slides, it can drive the cutting tool (5) to cut the lower layer of the strap.

7. The ultrasonic knife head of the girdle according to claim 1, characterized in that: A high-frequency vibration generating device is provided at the bottom of the welding tool (4), and an elastic shock-absorbing assembly (21) is provided between the welding tool (4) and the mounting seat (2).

8. The ultrasonic knife head of the girdle according to claim 7, wherein: The elastic shock-absorbing assembly (21) includes a fixed sleeve (211), a return spring (212) and a guide rod (213), and the fixed sleeve (211) is fixed on the tool body of the welding tool (4); The fixed sleeve (211) is provided with a guide groove (22), the guide rod (213) passes through the guide groove (22), one end of the guide rod (213) passes through the fixed sleeve (211) and is provided with a lower limiting portion (23), and the other end passes through the mounting seat (2) and is provided with an upper limiting portion (24) for restricting the fixed sleeve (211) and the welding tool (4) from sliding between the upper limiting portion (24) and the lower limiting portion (23). The return spring (212) is sleeved on the guide rod (213), and its elastic force acts between the fixed sleeve (211) and the lower limiting portion (23).

9. The ultrasonic cutter head of the girdle according to claim 3, characterized in that: The second driving mechanism (8) further includes a rear drive seat (81) provided at the upper end of the sliding member two (82) and a transmission rod two (83) provided at one side of the sliding member two (82), and the transmission rod two (83) can drive the sliding member two (82) to slide; The rear tool (3) is slidably arranged on the rear drive seat (81), and a third elastic member (25) is provided between the rear tool (3) and the rear drive seat (81), and its elastic force causes the rear tool (3) and the rear drive seat (81) to have a tendency to move away from each other.

10. The ultrasonic knife head of the girdle according to claim 9, wherein: A second connecting member (26) is provided between the second sliding member (82) and the movement frame (1). Guide rails (27) are mounted on opposite sides of the second sliding member (82) corresponding to the second connecting member (26) one by one, for guiding the sliding of the second sliding member (82).

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