Three-blade punching unit, copper strip automatic punching machine and processing method
Technical Field
The invention relates to the field of manufacturing of processing equipment, in particular to a three-blade punching unit, an automatic copper strip punching machine and a processing method.
Background
One of the electromagnetic suction plate materials is a copper strip, the copper strip is output by a copper strip plate, the copper strip is punched and cut into different lengths according to different specification requirements, and punching and notch punching operations are performed on the cut copper strip.
At present, the operations of cutting, punching and notching the copper strip need to be manually punched from a punch by using a die, and then the punching and notching are manually carried out, so that the waste materials in the operation steps are low in multiple efficiency. Automatic conveying, punching, notch punching and cutting equipment are also arranged on the market, but the three parts of the punching, notch punching and cutting are of separated structures, so that the equipment occupies a larger area and the purchase cost is higher.
Based on this, the present application is hereby proposed.
Disclosure of Invention
One of the purposes of the present invention is to provide a three-blade punching unit, which can complete three operations of punching, notching and cutting at the same unit, so as to solve the above-mentioned drawbacks.
The three-knife punching unit comprises a frame, wherein a bottom template and a punching driving part are fixed on the frame, a plurality of guide posts are fixed on the bottom template, a cutting template, a notch template, a punching template and a top template are arranged on the guide posts, an operation channel for allowing copper strips to enter is arranged on the bottom template, a waste hole for allowing waste to fall off is formed in the bottom surface of the operation channel, the cutting template, the notch template and the punching template are all in sliding connection with the guide posts, an elastic reset structure is arranged between the cutting template, the notch template and the punching template and the guide posts, and the top template is fixed with the guide posts;
the cutting die comprises a cutting die rod, a cutting die rod and a punching die rod, wherein rod holes for the cutting die rod, the cutting die rod and the punching die rod to pass through are formed in the cutting die plate, the punching die plate and the punching die plate, the cutting die rod is in clearance fit with the rod holes in the cutting die plate and is fixed with the rod holes in the cutting die plate, the punching die plate and the punching die plate, the punching die rod is fixed with the rod holes in the cutting die plate, the punching die rod is in clearance fit with the rod holes in the cutting die plate, the cutting die plate and the punching die plate and is fixed with the rod holes in the punching die plate, and cutter heads capable of entering an operation channel are arranged at the lower ends of the cutting die rod, the cutting die rod and the punching die rod;
The cutting knife bar, the notch knife bar and the punching knife bar all penetrate out of the top template upwards and are respectively fixed with a horizontal mounting plate, the action end of the punching driving part is provided with a liftable pressing block, one end of the horizontal mounting plate is positioned below the pressing block, the other end of the horizontal mounting plate is fixed with a linkage driving part, the horizontal mounting plate is provided with a sliding block, and the linkage driving part is used for driving the sliding block to enter or be far away from the lower part of the pressing block.
Further, a limit template is arranged on the guide post, is adjacent to the bottom template and is positioned above the bottom template, and the limit template is detachably and fixedly connected with the guide post and is used for controlling the height of the operation channel;
the limiting template is provided with rod holes for the cutting-off cutter bar, the notch cutter bar and the punching cutter bar to pass through, and the rod holes on the limiting template are in clearance fit with the cutting-off cutter bar, the notch cutter bar and the punching cutter bar.
The invention also aims to provide an automatic copper strip punching machine which comprises a feeding unit, a conveying unit and the three-cutter punching unit, wherein the feeding unit outputs a copper strip from a copper strip disc to the conveying unit, the conveying unit outputs the copper strip to the three-cutter punching unit, and the three-cutter punching unit performs punching, notch punching and cutting operations on the copper strip.
Further, the feeding unit comprises a feeding base, a turntable driving part, a turntable driving controller and a tensioning adjusting mechanism are arranged on the feeding base, and the turntable is used for placing copper tape reels;
The tensioning adjusting mechanism comprises a vertical rod and a rotating seat which is rotationally connected with the upper end of the vertical rod, an upper limit switch and a lower limit switch which are matched with the rotating seat are arranged at the upper end of the vertical rod, a swing arm I and a swing arm II which are vertically arranged are fixed on the rotating seat, a balancing weight is fixed at the end part of the swing arm I, which is far away from the rotating seat, the end part of the swing arm II, which is far away from the rotating seat, is of a ring-shaped structure, and a copper strip output by the copper strip disc passes through the ring-shaped structure of the swing arm II and then enters the conveying unit;
The output ends of the upper limit switch and the lower limit switch are connected with the input end of the turntable driving controller, the output end of the turntable driving controller is connected with the input end of the turntable driving part, and the turntable driving controller controls the start and stop of the turntable driving part according to feedback signals of the upper limit switch and the lower limit switch.
Further, a screw hole is formed in the balancing weight, a tightening screw is arranged on the screw hole, and the swing arm I is fixedly connected with the balancing weight through the tightening screw.
Further, the rotating seat is provided with a through second swing arm mounting hole, the rotating seat is provided with a screw hole, the screw hole is provided with a jacking screw, and the second swing arm passes through the second swing arm mounting hole and is fixedly connected with the rotating seat through the jacking screw.
Further, the conveying unit comprises a clamping cylinder conveying part, the clamping cylinder conveying part comprises a plurality of pairs of clamping cylinder groups, two mountain plates and a clamping cylinder driving part, the clamping cylinder driving part is used for driving the clamping cylinder groups to rotate, the clamping cylinder groups are arranged between the two mountain plates and along the conveying direction of the copper strips, the clamping cylinder groups comprise lower clamping cylinders and upper clamping cylinders, and the copper strips are clamped by the upper clamping cylinders and the lower clamping cylinders to be conveyed forwards.
Further, a clamping degree fine adjustment mechanism is arranged at the position of the mountain plate, which is positioned on the upper clamping cylinder, the clamping degree fine adjustment mechanism sequentially comprises a fine adjustment plate, a transition plate and an adjusting seat from bottom to top, a notch for the fine adjustment plate to be inserted is arranged at the upper edge of the mountain plate, and two ends of the upper clamping cylinder are arranged on the fine adjustment plate through bearings;
The two ends of the transition plate are provided with fixing screw holes positioned at two sides of the notch, fixing bolts fixedly connected with the mountain plate are arranged in the fixing screw holes, the middle part of the transition plate is provided with a lower adjusting screw hole, a jacking through hole is arranged between the lower adjusting screw hole and the fixing screw hole, a rubber rod is arranged in the jacking through hole, the lower end of the rubber rod jacks the fine tuning plate, and the upper end of the rubber rod protrudes out of the jacking through hole;
the middle part of adjusting seat is equipped with the regulation screw, is equipped with the adjusting bolt that can screw in down the regulation screw in the regulation screw, the both sides that the adjusting seat was located the regulation screw are equipped with the top that is opposite with the tight through-hole in top and sticis the inslot, and the rubber stick can get into the top and sticis the inslot, and the degree of depth in top sticis the groove is less than the height that the rubber stick protrusion was sticis the through-hole.
Further, the conveying unit comprises a limiting part positioned between the clamping cylinder conveying part and the feeding unit, the limiting part comprises a horizontal limiting plate and a plurality of vertical limiting plates fixed on the horizontal limiting plate, an upper limiting roller and a lower limiting roller are arranged between two adjacent vertical limiting plates, and the copper strip horizontally enters between two adjacent vertical limiting plates and passes through the upper limiting roller and the lower limiting roller.
The invention further aims to provide a processing method based on the copper strip automatic punching machine, which comprises the following steps of:
the copper strip enters an operation channel of a three-blade punching unit;
if the punching operation is needed at this time, the linkage driving part on the punching cutter bar drives the sliding block to move below the pressing block, the pressing block is pressed down, and the sliding block drives the punching cutter bar to undershoot, so that the punching is completed;
If notch punching operation is needed at this time, the linkage driving part on the notch cutter bar drives the sliding block to move below the pressing block, the pressing block is pressed down, and the notch cutter bar is driven to punch downwards through the sliding block, so that the notch is completed;
if the cutting operation is needed at this time, the linkage driving part on the cutting cutter bar drives the sliding block to move to the lower part of the pressing block, the pressing block is pressed down, and the cutting cutter bar is driven to undershoot through the sliding block, so that the cutting is completed.
The invention has the advantages that:
1. The punching, notch punching and cutting mechanisms are integrated in a set of device through the linkage driving part, so that the processes of punching, notch punching and cutting can be finished in continuous operation, the copper strips are not required to be transferred and conveyed for multiple times, the efficiency is high, the rejection rate is low, and the occupied area and the manufacturing cost of equipment are greatly reduced;
2. The heavy hammer type tensioning device and the limit switch are matched, so that the automatic start and stop control of the rotary table can be realized while the tensioning adjustment is realized, namely, the copper belt stops conveying during punching operation, the tension degree is reduced, the rotary table can automatically stop the output of the copper belt, after the punching operation is finished, the copper belt continues conveying, the tension degree is increased, and the rotary table automatically continues the output of the copper belt;
3. Although tensioning device has been set up, still can have certain distance between material loading unit and the conveying unit because the operation needs, in this section of distance, the copper strips of carrying are not necessarily horizontal transport, can take place the upset of slant for the copper strips that gets into the conveying unit have certain skew or deformation, through setting up the spacing portion that is located between clamp section of thick bamboo conveying part and the material loading unit, guaranteed that the copper strips are the horizontality and carry into clamp section of thick bamboo conveying part in the middle, guaranteed the quality that the copper strips were processed.
Drawings
FIG. 1 is a schematic view of a three-dimensional structure of the copper strip automatic punching machine in the embodiment;
FIG. 2 is a schematic three-dimensional structure of a feeding unit in the embodiment;
FIG. 3 is a schematic side view of a stopper portion of a conveying unit according to an embodiment;
FIG. 4 is a schematic view showing a three-dimensional configuration of a cartridge conveying section of the conveying unit in the embodiment;
FIG. 5 is a schematic cross-sectional view of a clamping degree fine adjustment mechanism in a cartridge transport section according to an embodiment;
FIG. 6 is a schematic view showing a three-dimensional configuration of a three-blade punching unit in the embodiment;
FIG. 7 is an assembly schematic diagram of parts related to punching operation in the three-blade punching unit according to the embodiment;
FIG. 8 is an assembly schematic diagram of the related parts of the slitting operation in the three-blade punching unit according to the embodiment;
FIG. 9 is an assembly schematic of the related parts of the cutting operation in the three-blade punching unit according to the embodiment;
fig. 10 is a schematic structural view of an elastic reset structure among a cutting die plate, a notch die plate, a stripper plate and a guide post in a three-blade punching unit.
Description of the reference numerals
1-Copper strips;
2-feeding units, 201-feeding bases, 202-turntables, 203-vertical rods, 204-rotating bases, 205-first swing arms, 206-second swing arms and 207-balancing weights;
3-conveying units, 301-limiting parts, 3011-horizontal limiting plates, 3012-vertical limiting plates, 3013-upper limiting rollers, 3014-lower limiting rollers, 302-cartridge conveying parts, 3021-mountain plates, 3022-cartridge driving parts, 3023-upper cartridges, 3024-lower cartridges, 3025-fine tuning plates, 3026-transition plates, 3027-adjusting seats, 3028-fixing bolts, 3029-rubber rods, 30210-top pressing grooves, 30211-adjusting bolts;
4-three-blade punching unit, 401-frame, 402-bottom die plate, 403-punching drive, 404-guide post, 405-cutting die plate, 406-cut die plate, 407-punch die plate, 408-top die plate, 409-working channel, 410-scrap hole, 411-elastic reset structure, 412-cutting blade bar, 413-cut blade bar, 414-punch blade bar, 415-bar hole, 416 a-cutting blade bar tool bit, 416 b-cutting blade bar tool bit, 416 c-punch blade bar tool bit, 417-horizontal mounting plate, 418-press block, 419 a-cutting linkage drive on blade bar, 419 b-linkage drive on cut blade bar, 419 c-linkage drive on punch blade bar, 420 a-cutting blade bar slide on 420 b-cutting blade bar, 420 c-punching blade bar slide on blade bar, 421-limit die plate.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like herein indicate an orientation or a positional relationship based on the orientation or the positional relationship shown in the drawings, and are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The embodiment provides an automatic copper strip punching machine, as shown in fig. 1, the automatic copper strip punching machine comprises a feeding unit 2, a conveying unit 3 and a three-cutter punching unit 4, wherein the feeding unit 2 outputs a copper strip from a copper strip disc to the conveying unit 3, the conveying unit 3 outputs the copper strip to the three-cutter punching unit 4, and the three-cutter punching unit 4 performs punching, notch punching and cutting operation on the copper strip.
As shown in fig. 2, the feeding unit 2 includes a feeding base 201, a turntable 202, a turntable driving part, a turntable driving controller and a tension adjusting mechanism are disposed on the feeding base 201, and a copper tape reel is placed on the turntable 202. The tensioning adjustment mechanism comprises a vertical rod 203, the lower end of the vertical rod 203 is fixed on a feeding base 201, the upper end of the vertical rod 203 is rotationally connected with a rotating seat 204, and the upper end of the vertical rod 203 is also provided with an upper limit switch and a lower limit switch (not shown in the figure) which are matched with the rotating seat 204. The swing seat 204 is fixedly provided with a swing arm I205 and a swing arm II 206 which are vertically arranged, wherein the end part of the swing arm I205, which is far away from the swing seat 204, is fixedly provided with a balancing weight 207, the end part of the swing arm II 206, which is far away from the swing seat 204, is of a ring-shaped structure, the ring-shaped structure is convenient for a copper strip to pass through, and simultaneously, the tensioning force is transmitted to the swing arm II 206, and the copper strip output by the copper strip disc enters the conveying unit 3 after passing through the ring-shaped structure of the swing arm II 206. In this embodiment, the output end of the upper limit switch and the output end of the lower limit switch are connected with the input end of the turntable driving controller, the output end of the turntable driving controller is connected with the input end of the turntable driving part, and the turntable driving controller controls the start and stop of the turntable driving part according to the feedback signals of the upper limit switch and the lower limit switch to realize the start and stop of the turntable 202.
The control flow of the turning disc start-stop of the feeding unit 2 is as follows:
When the turntable 202 is not started and the conveying unit 3 is started to convey the copper strips, the copper strips between the feeding unit 2 and the conveying unit 3 are tensioned, the swing arm II 206 is gradually lifted under the drive of the copper strips, the swing arm II 206 is lifted by a certain angle to trigger the upper limit switch, the upper limit switch sends a feedback signal to the turntable driving controller, the turntable driving controller controls the turntable driving part to start, and the turntable 202 rotates to enable the copper strips to be output from the copper strip tray;
when the three-blade punching unit 4 performs punching operation, the conveying unit 3 stops conveying the copper strips, the turntable 202 still continuously rotates at the moment, the copper strips between the feeding unit 2 and the conveying unit 3 are loosened, the swing arm II 206 is gradually lowered under the drive of the copper strips, the lower limit switch is triggered when the swing arm II 206 is lowered by a certain angle, the lower limit switch sends a feedback signal to the turntable driving controller, the turntable driving controller controls the turntable driving part to stop, the turntable 202 stops rotating, and the copper strips are not output to the conveying unit 3.
The heavy hammer type tensioning device is utilized, namely, the copper strip tensioning adjustment can be realized through the swing adjustment of the swing arm II. The automatic start-stop control of the turntable 202 can also be realized by utilizing the cooperation of the heavy hammer type tensioning device and the limit switch. In order to facilitate the adjustment of the counterweight on the swing arm I205, the counterweight 207 in this embodiment is provided with a screw hole, and a tightening screw is arranged on the screw hole, and the swing arm I205 is fixedly connected with the counterweight 207 through the tightening screw, so that the increase and decrease of the counterweight 207 can be realized by screwing the tightening screw. Further, the rotating seat 204 is provided with a through second swing arm mounting hole, the rotating seat 204 is provided with a screw hole, the screw hole is provided with a tightening screw, after the second swing arm 206 passes through the second swing arm mounting hole, the second swing arm 206 is fixedly connected with the rotating seat 204 through the tightening screw, and after the design, the adjustment of the length of the second swing arm 206 can be realized by unscrewing the tightening screw.
As shown in fig. 4, the conveying unit 3 includes a clip transporting portion 302, the clip transporting portion 302 includes a plurality of pairs of clip groups, two mountain plates 3021 and a clip driving portion 3022, the clip driving portion 3022 is used for driving the clip groups to rotate, the clip groups are mounted between the two mountain plates 3021 and are arranged along the copper strip transporting direction, the clip groups include a lower clip 3024 and an upper clip 3023, and the copper strip is transported forward by being clamped by the upper and lower clips 3023, 3024. The clamping force of the clamping cylinder group on the copper strip is convenient to adjust, and the clamping cylinder conveying part 302 of the embodiment is positioned at the upper clamping cylinder 3023 and is also provided with a clamping degree fine adjustment mechanism.
As shown in FIG. 5, the clamping degree fine adjustment mechanism sequentially comprises a fine adjustment plate 3025, a transition plate 3026 and an adjustment seat 3027 from bottom to top, wherein a notch (the depth of the notch is slightly larger than the height of the fine adjustment plate 3025) for allowing the fine adjustment plate 3025 to be inserted is formed in the upper edge of the mountain plate 3021, the two ends of the upper clamping cylinder 3023 are mounted on the fine adjustment plate 3025 through bearings, fixing screw holes (screw holes corresponding to the fixing screw holes are formed in the mountain plate) are formed in the two ends of the transition plate 3026, a fixing bolt 3028 fixedly connected with the mountain plate 3021 is arranged in the fixing screw holes, a lower adjustment screw hole is formed in the middle of the transition plate 3026, a jacking through hole is formed between the lower adjustment screw hole and the fixing screw hole, a rubber rod 3029 is arranged in the jacking through hole, the lower end of the rubber rod 3029 is jacked up to the fine adjustment plate screw hole, an upper adjustment screw hole is formed in the middle of the adjustment seat 3027, a lower adjustment screw hole is formed in the upper adjustment screw hole, a pressing groove 30225 is formed in the upper adjustment screw hole and can be screwed into the lower adjustment screw hole, and a pressing groove 3027 is formed in the pressing groove 10, and the pressing groove 10 is formed in the pressing groove is opposite to the pressing groove, and the pressing groove pressing the rubber rod 30210 is located in the pressing groove pressing tightly. When the clamping degree needs to be adjusted, the connection tightness between the adjusting seat 3027 and the transition plate 3026 can be achieved by screwing the adjusting bolt 30211, so that the downward jacking force applied to the rubber rod 3029 by the jacking groove 30210 is changed, and the fine adjustment of the clamping force between the upper clamping cylinder 3023 and the lower clamping cylinder 3024 is achieved by changing the downward jacking force of the fine adjustment plate 3025 by the rubber rod 3029.
Due to the operation requirement, a certain distance still exists between the feeding unit 2 and the conveying unit 3, in this distance, the conveyed copper strip is not necessarily conveyed horizontally, and oblique overturning may occur, so that the copper strip entering the conveying unit 3 has certain offset or deformation. To solve this disadvantage, as shown in fig. 1, the conveying unit 3 includes a limiting portion 301 located between the clip barrel conveying portion 302 and the feeding unit 2, the limiting portion 301 includes a horizontal limiting plate 3011 and a plurality of vertical limiting plates 3012 fixed on the horizontal limiting plate 3011, as shown in fig. 3, an upper limiting roller 3013 and a lower limiting roller 3014 are disposed between two adjacent vertical limiting plates 3012, and the copper strip horizontally enters between two adjacent vertical limiting plates 3012 and passes through between the upper and lower limiting rollers 3013 and 3014. The copper strip is guaranteed to be in a horizontal state and is conveyed into the clamping cylinder conveying part 302 in a centered mode, and the processing quality of the copper strip is guaranteed.
As shown in fig. 6 to 10, the three-blade punching unit 4 comprises a frame 401 with a rectangular frame structure, a bottom template 402 and a punching driving part 403 are fixed on the frame 401, four guide posts 404 are fixed on the bottom template 402, a limit template 421, a cutting template 405, a notch template 406, a punching template 407 and a top template 408 are sequentially arranged on the guide posts 404 from bottom to top, a working channel 409 for allowing copper strips to enter is formed between the bottom template 402 and the limit template 421, a waste hole 410 for allowing waste to fall off is formed in the bottom surface of the working channel 409 (the waste hole 410 penetrates through a lower workbench), the cutting template 405, the notch template 406 and the punching template 407 are all in sliding connection with the guide posts 404, an elastic reset structure 411 is arranged between the cutting template 405, the notch template 406 and the punching template 407 and the guide posts 404, and the limit template 421 and the top template 408 are all fixedly connected with the guide posts 404. As shown in fig. 10, this embodiment illustrates an elastic return structure 411, that is, the return of the relevant template is achieved by a spring force, and other structures may be used to achieve the return of the relevant template.
The three-blade punching unit 4 further comprises a cutting blade bar 412, a cutting blade bar 413 and a punching blade bar 414, wherein the limiting blade bar 421, the cutting blade bar 405, the cutting blade bar 406, the punching blade bar 407 and the top blade bar 408 are respectively provided with a bar hole 415 through which the cutting blade bar 412, the cutting blade bar 413 and the punching blade bar 414 pass, the cutting blade bar 412 is in clearance fit with the bar holes 415 on the limiting blade bar 421, the cutting blade bar 406, the punching blade bar 407 and the top blade bar 408 and is fixed with the bar holes 415 on the limiting blade bar 421, the cutting blade bar 405, the punching blade bar 407 and the top blade bar 408, the punching blade bar 414 is in clearance fit with the bar holes 415 on the limiting blade bar 421, the cutting blade bar 405, the cutting blade bar 413 and the top blade bar 414, and is fixed with the bar holes 415 on the punching blade bar 407, and the cutting blade bars 412, the cutting blade bar 413 and the lower ends of the punching blade bar 414 are provided with blade bits 416a, 416b and 416c capable of entering the working channel 409. The cutting knife bar 412, the notch knife bar 413 and the punching knife bar 414 all penetrate out of the top die plate 408, and are all fixed with a horizontal mounting plate 417, the actuating end of the punching driving portion 403 is provided with a liftable pressing block 418, one end of the horizontal mounting plate 417 is located below the pressing block 418, the other end is fixed with a linkage driving portion 419a, 419b, 419c, the horizontal mounting plate 417 is provided with sliding blocks 420a, 420b, 420c, and the linkage driving portion 419a, 419b, 419c is used for driving the sliding blocks 420a, 420b, 420c to enter or depart from the lower side of the pressing block 418.
Since the linkage operation processes of the three cutter bars are similar, the punching operation is taken as an example in the embodiment, and the operation process of the cutter bars is described in detail.
As shown in fig. 7, after the copper strip enters the working channel 409 and is in place, the system judges that the punching operation needs to be performed at this time, the linkage driving part 419c is started, so that the sliding block 420c slides to be right below the pressing block 418, the punching driving part 403 controls the pressing block 418 to be pressed down, the pressing block 418 moves down to enable the punching cutter bar 414 to move down through the sliding block 420c and the horizontal mounting plate 417, in the process of moving down the punching cutter bar 414, the notch template 406 and the cutting template 405 are not moved, the punching template 407 moves down along with the punching cutter bar 414, meanwhile, the punching cutter bar 414 drives the cutter head 416c at the lower end to punch down, the punching of the copper strip is completed, the punched waste is discharged through the waste hole 410, after the punching is completed, the punching driving part 403 and the linkage driving part 419c are reset, after the pressing force is lost, the punching template 407 is reset upwards under the action of the elastic reset structure 411, and the reset of the punching template 407 drives the lifting of the punching cutter bar 414 to reset.
The linkage control process of the three-blade punching unit 4 is as follows:
the copper strip enters an operation channel 409 of the three-blade punching unit 4;
if the punching operation is needed at this time, the linkage driving part 419c on the punching cutter bar 414 drives the sliding block 420c to move below the pressing block 418, the pressing block 418 presses down, and the sliding block 420c drives the punching cutter bar 414 to undershoot, so that the punching is completed;
if the notch punching operation is needed at this time, the linkage driving part 419b on the notch cutter bar 413 drives the sliding block 420b to move below the pressing block 418, the pressing block 418 is pressed down, and the notch cutter bar 413 is driven to undershoot through the sliding block 420b, so that the notch is completed;
if the cutting operation is required at this time, the linkage driving part 419a on the cutting blade bar 412 drives the slider 420a to move below the pressing block 418, the pressing block 418 is pressed down, and the cutting blade bar 412 is driven to undershoot by the slider 420a, so that the cutting is completed.
Preferably, the limiting template 421 of the present embodiment is detachably and fixedly connected to the guide post 404, so as to control the height of the working channel 409. Can dismantle fixed knot constructs can adopt the mode of tight screw in the top, through the loosening tightening bolt, can realize the reciprocates of spacing template 421 to change the height of operation passageway 409, with the copper strips of adaptation different specifications.
The above embodiments are only for illustrating the concept of the present invention and not for limiting the protection of the claims of the present invention, and all the insubstantial modifications of the present invention using the concept shall fall within the protection scope of the present invention.