Synchronous adjustment of variable pitch multi-wire sawing device

Abstract

The utility model provides a kind of variable pitch's multi-wire cutting device of synchronous regulation, including rack, variable pitch driving mechanism, roller wheel group, cutting line and second driving mechanism and synchronous transmission mechanism, variable pitch driving mechanism includes the first driving mechanism for driving outer roller wheel rotation realizes cutting operation and the variable pitch component for adjusting roller wheel group pitch, the utility model can not disassemble roller wheel group when adjusting pitch, only through motor control can the pitch of roller wheel group be synchronously regulated, in the variable pitch multi-wire cutting machining process, the stable operation of wire cutting machine can be realized, benefit from the small step angle of stepping motor, the high transmission ratio of worm and worm gear and the wide range transmission ratio of planetary gear set in the aspect of adjustment, so that the pitch adjustment of the utility model has the characteristics of high efficiency, high stability, high precision, high flexibility, suitable for the production scene with high efficiency, high precision, wide cutting range machining demand, so that the utility model is easy to popularize and apply.

Description

TECHNICAL FIELD

[0001] The utility model relates to cutting equipment technical field, specifically, relate to a synchronous regulation variable spacing's multi -wire cutting device. BACKGROUND

[0002] The currently commonly used multi -wire cutting equipment is limited in cutting interval adjustment range, cannot be adjusted simultaneously and cannot be automatically controlled, therefore the application range is limited, is only suitable for cutting specific specification's stone product, and cutting efficiency is limited, flexibility is poor, cutting width range is limited.

[0003] Therefore, the applicant specifically proposes the present application after studying the prior art. CONTENT OF UTILITY MODEL

[0004] The utility model provides a synchronous regulation variable spacing's multi -wire cutting device, aims at improving at least one of above -mentioned technical problem.

[0005] In order to solve above technical problem, the utility model provides a synchronous regulation variable spacing's multi -wire cutting device, including frame, roller wheel group and the cutting line of being connected on roller wheel group, still including variable spacing drive mechanism, two groups of variable spacing drive mechanism are parallelly arranged on the both sides of frame, and multiple roller wheel groups are configured on variable spacing drive mechanism;Variable spacing drive mechanism includes first drive mechanism and variable spacing assembly, roller wheel group is connected with first drive mechanism and is arranged, to drive the rotation of roller wheel group;Variable spacing assembly is connected with each roller wheel group and is arranged, to adjust the spacing between each roller wheel group on variable spacing drive mechanism;Still including second drive mechanism, second drive mechanism is connected with one side variable spacing assembly and is arranged, to be used as the driving source of variable spacing assembly, and second drive mechanism is arranged on the side of roller wheel group away from the output end of first drive mechanism;Still including synchronous transmission mechanism, and synchronous transmission mechanism is connected and is arranged between both sides variable spacing assembly.

[0006] As further optimization, roller wheel group includes inner roller, outer roller and first bearing, first bearing is connected and is arranged between the outer peripheral circle of inner roller and the inner peripheral circle of outer roller, and cutting line is configured on outer roller.

[0007] As further optimization, first drive mechanism includes first drive motor, drive base plate, driven base plate and multiple drive rods, first drive motor is installed and is fixed on frame, the output end of first drive motor is coaxially fixed on drive base plate, driven base plate is rotatably connected on frame, drive rod is fixedly connected between drive base plate and driven base plate, and multiple drive rods are arranged in circumferential array on drive base plate;Drive rod passes through outer roller and is slidably connected.

[0008] As a further optimization, the variable distance assembly comprises a planetary gear set and a plurality of variable distance screws, the planetary gear set is coaxially arranged with the roller wheel set; the variable distance screws are coaxially fixed on the planetary gears of the planetary gear set; two groups of variable distance thread groove groups are symmetrically arranged on the variable distance screws, the variable distance thread groove groups are provided with a plurality of thread grooves with different pitches, one end of the thread grooves gradually converges to the middle part of the variable distance screw, and the other end gradually diverges away from the middle part; the thread grooves are arranged at equal intervals on the same generatrix of the variable distance screw; the inner roller is provided with a connecting hole through which the variable distance screw passes, and a protrusion adapted to slide with the thread groove is formed on the inner side wall of the connecting hole.

[0009] As a further optimization, the planetary gear set comprises a sun gear, a planetary gear and an inner ring gear, the inner ring gear is fixed on the frame, and a plurality of planetary gears are meshingly arranged between the sun gear and the inner ring gear; the second driving mechanism comprises a second driving motor, a worm gear and a worm, a flat key shaft is coaxially arranged on the sun gear, the worm gear is coaxially connected to the other end of the flat key shaft, the output end of the second driving motor is coaxially fixedly connected with the worm, and the worm is in transmission connection with the worm gear.

[0010] As a further optimization, the synchronous transmission mechanism comprises a synchronous belt and two synchronous wheels, the synchronous wheels are coaxially arranged on the flat key shaft, and the synchronous belt is connected between the two synchronous wheels of the two variable distance driving mechanisms.

[0011] As a further optimization, the synchronous belt and the synchronous wheel are in meshing transmission.

[0012] As a further optimization, a second bearing is connected between the driven bottom plate and the frame.

[0013] As a further optimization, the pitch of the thread groove at one end close to the middle part of the variable distance screw is the same as the thickness of the roller wheel set.

[0014] As a further optimization, the pitch of the thread groove is calculated according to the following formula: Wherein, m represents the thread groove required to calculate the pitch of the same group of variable distance thread groove groups, n=2m; D is the maximum distance between the thread grooves, and d is the minimum distance between the thread grooves.

[0015] By adopting the above technical scheme, the present application has the following beneficial effects:

[0016] 1. The utility model discloses a first drive mechanism is as the rotation source of roller wheel group, makes the drive rod can be in the stable transmission torque while not constraint roller wheel group's displacement in the axial direction, and through setting roller wheel group on the variable distance assembly, and the accurate variable distance control of multiple roller wheel groups can be realized through the variable distance assembly.

[0017] 2. The utility model discloses a first drive mechanism drives the rotation of outer roller wheel to realize the high -speed cutting of cutting line, and the inner roller wheel is kept relatively static under the restriction of variable distance assembly, thereby guaranteeing the position stability when rotating and cutting.

[0018] 3. Through the synchronous transmission mechanism cooperation of the synchronous wheel and synchronous belt of toothed connection, realize the synchronous transmission between two groups of drive variable distance drive mechanism, thereby realizing the accurate synchronous variable distance operation of roller wheel group on both sides, can not disassemble roller wheel group when adjusting the interval, and only through the control motor can the interval of roller wheel group be adjusted synchronously.

[0019] 4. The utility model discloses a second drive mechanism as the driving source, through the self -lock of worm wheel and worm and the continuous keeping of torsion of second drive motor, can realize the stable operation of cutting device, with stepper motor as second drive motor, realize the high transmission ratio of smaller step angle cooperation worm wheel worm and the wide range transmission ratio of planetary gear set, make that the interval adjustment of the utility model discloses has the characteristics of high efficiency, high stability, high precision, high flexibility, is applicable to the production scene of high efficiency, high precision, wide cutting range processing demand, make the utility model discloses easy to popularize and application. DRAWINGS

[0020] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be simply introduced to the drawing needed to be used in the embodiment, and should understand, the following drawing only shows some embodiments of the utility model, therefore should not be regarded as the limitation to the range, for ordinary skilled person in the art, under the premise of not paying the creative labor, still can obtain other related drawings according to these drawings.

[0021] Figure 1 It is a three-dimensional structure schematic diagram of the utility model discloses a synchronous regulation variable interval's multiple line cutting device;

[0022] Figure 2 It is a side structure schematic diagram of the utility model discloses a synchronous regulation variable interval's multiple line cutting device;

[0023] Figure 3 It is the schematic diagram of the local structure of the second drive mechanism of the utility model;

[0024] Figure 4It is the schematic diagram of the local structure of the second driving mechanism of the utility model;

[0025] Figure 5 It is the schematic diagram of the section structure of the upper roller wheel group of the variable distance driving mechanism of the embodiment;

[0026] Figure 6 It is the schematic diagram of the local structure of the converging one end of the screw groove.

[0027] Marked in the figure: 1, rack; 2, roller wheel group; 3, cutting line; 4, first driving mechanism; 5, variable distance assembly; 6, second driving mechanism; 7, synchronous transmission mechanism; 201, inner roller; 202, outer roller; 203, first bearing; 401, first driving motor; 402, driving bottom plate; 403, driven bottom plate; 404, driving rod; 405, second bearing; 501, planetary gear set; 502, variable distance screw rod; 601, second driving motor; 602, worm wheel; 603, worm; 701, synchronous belt; 702, synchronous wheel; 2011, connecting hole; 2012, protruding block; 5011, sun gear; 5012, planetary gear; 5013, inner gear ring; 5014, flat key shaft; 5021, variable distance screw groove group; 50211, screw groove. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0029] By Figures 1 to 6The utility model discloses a kind of synchronous regulation variable pitch's multi-wire cutting device, including rack 1, variable pitch driving mechanism, roller group 2 and cutting line 3, two groups of variable pitch driving mechanism are fixed on the both sides of rack 1, and are parallelly arranged, multiple roller groups 2 are configured on variable pitch driving mechanism, and cutting line 3 is connected and set between corresponding roller group 2 on two groups of variable pitch driving mechanism;Variable pitch driving mechanism includes first driving mechanism 4 and variable pitch assembly 5, roller group 2 is set on the output shaft of first driving mechanism 4, to drive roller group 2 rotation, when roller group 2 rotates, cutting line 3 is driven to cut, wherein, two groups of variable pitch driving mechanism should keep proper distance, to guarantee the tension degree required when cutting line 3 cuts;Roller group 2 is connected and set on variable pitch assembly 5, and the distance between each roller group 2 on the same variable pitch driving mechanism is adjusted by variable pitch assembly 5;Wherein, synchronous transmission mechanism 7 of transmission connection between two groups of variable pitch driving mechanism is further provided, to realize that two groups of variable pitch assembly 5 are synchronous when variable pitch, so that two roller groups 2 on the same cutting line 3 are synchronous variable, ensure the stability when cutting.

[0030] Further comprising second driving mechanism 6, the output end of second driving mechanism 6 is connected with the input end of the variable pitch assembly 5 on one side and is arranged, and variable pitch assembly 5 is adjusted by second driving mechanism 6, and then multiple roller groups 2 on variable pitch assembly 5 are driven to variable pitch, wherein, the variable pitch here refers to the distance change between multiple roller groups 2 on the same variable pitch driving mechanism.

[0031] Preferably, roller group 2 includes inner roller 201, outer roller 202 and first bearing 203, first bearing 203 is connected and arranged between the outer periphery of inner roller 201 and the inner periphery of outer roller 202, and cutting line 3 is configured on outer roller 202, wherein, first bearing 203 is small radial cylindrical roller bearing.

[0032] Further, the first driving mechanism 4 comprises a first driving motor 401, a driving base plate 402, a driven base plate 403 and a plurality of driving rods 404, the first driving motor 401 is fixedly installed on the frame 1, wherein the first driving motor 401 is arranged on one side of the variable distance driving mechanism, in this embodiment, on the right side, the output end of the second driving mechanism 6 is arranged on the other side, i.e. the left side, and is in transmission connection with the input end of the variable distance assembly 5, so that the two do not affect each other. The output end of the first driving motor 401 is coaxially fixed on the driving base plate 402, the driven base plate 403 is rotatably connected to the frame 1 through a second bearing 405, the second bearing 405 is a large-diameter cylindrical roller bearing, the driving rods 404 are fixedly connected between the driving base plate 402 and the driven base plate 403 through nuts, and the plurality of driving rods 404 are arranged in a circumferential array on the driving base plate 402; the driving rods 404 pass through the outer roller wheel 202 and are in sliding connection, so as not to constrain the axial displacement movement of the outer roller wheel 202 on the driving rods 404. In this embodiment, three driving rods 404 are arranged, the three driving rods 404 are equidistantly arranged, and the distance from the axis of the roller wheel set 2 is also the same, so that when the first driving motor 401 is driven, the outer roller wheel 202 can be driven to rotate by the driving base plate 402 and the driving rods 404, and the three driving rods 404 can drive the outer roller wheel 202 to rotate, so as to effectively ensure the stability of the first driving mechanism 4.

[0033] In this embodiment, the first driving motor 401 is a servo motor.

[0034] Preferably, the variable distance assembly 5 comprises a planetary gear set 501 and a plurality of variable distance screws 502, wherein the planetary gear set 501 comprises a sun gear 5011, a plurality of planetary gears 5012 and an inner ring gear 5013, the inner ring gear 5013 is fixedly arranged on a mounting seat of the frame 1, and the two sides are communicated, a plurality of planetary gears 5012 are arranged in meshing between the sun gear 5011 and the inner ring gear 5013, and in the embodiment, three planetary gears 5012 are arranged on the outer periphery of the sun gear 5011; the planetary gear set 501 is coaxially arranged with the roller wheel set 2; correspondingly, the three variable distance screws 502 are coaxially fixed on the three planetary gears 5012 of the planetary gear set 501. The variable distance screw 502 is symmetrically provided with two groups of variable distance thread groove groups 5021, the two groups of variable distance thread groove groups 5021 are symmetrically arranged on the variable distance screw 502, the variable distance thread groove group 5021 is provided with a plurality of thread grooves 50211 with different pitches, and the pitch here refers to the length of the thread groove 50211, wherein in the embodiment, each group of variable distance thread groove groups 5021 is provided with five thread grooves 50211, and each variable distance screw 502 is provided with ten thread grooves 50211. One end of the thread groove 50211 gradually converges at the middle part of the variable distance screw 502, and the other end gradually diverges away from the middle part. The left five thread grooves 50211 are dispersed to the left from one end to the other end of the middle part, and the right five thread grooves 50211 are dispersed to the right from one end to the other end of the middle part, forming symmetry. Among them, on the same generatrix of the variable distance screw 502, even on any generatrix, the ten thread grooves 50211 in the embodiment are arranged at equal intervals between adjacent ones. It should be noted that when the two thread grooves 50211 closest to the middle of the variable distance screw 502 are arranged at equal intervals at their ends, the equal interval arrangement of the total ten thread grooves 50211 of the left and right groups can be realized. Further, the inner roller 201 is provided with a connecting hole 2011 through which the variable distance screw 502 passes, and the inner side wall of the connecting hole 2011 is formed with a protrusion 2012 which is in sliding connection with the thread groove 50211. Conversely, the embodiment is provided with ten groups of roller wheel sets 2, each group of roller wheel set 2 is arranged on each thread groove 50211, and the adjacent intervals of the ten groups of roller wheel sets 2 are the same. When arranged, the protrusions 2012 of the ten groups of roller wheel sets 2 are located in each thread groove 50211 on the same generatrix, so that each roller wheel is also arranged at equal intervals. When the second driving mechanism 6 drives the planetary gear set 501 to operate, the three variable distance screws 502 are simultaneously driven to rotate, thereby stably enabling the protrusions 2012 to move along the thread grooves 50211 with the rotation of the variable distance screws 502, thereby realizing the simultaneous reduction or expansion of the intervals between the roller wheel sets 2 after rotation while maintaining equal interval arrangement. And because the inner roller 201 and the outer roller 202 can rotate relative to each other, the outer roller 202 and the inner roller 201 do not affect each other while changing the size of the interval.It should be noted that the three pitch screws 502 are arranged in parallel with equal intervals, and the angles of the pitch screw thread groove groups 5021 are also the same, so that the three pitch screws 502 can rotate synchronously, and since the three pitch screws 502 pass through the connecting inner rollers 201 at the same time, the inner rollers 201 are limited to rotate in the radial direction, so that the inner rollers 201 can be driven to realize axial displacement when the pitch screws 502 rotate.

[0035] Further, the second driving mechanism 6 includes a second driving motor 601, a worm gear 602 and a worm 603, a flat key shaft 5014 is coaxially arranged on the sun gear 5011, the worm gear 602 is coaxially connected and arranged at the other end of the flat key shaft 5014, in the embodiment, the second driving motor 601 is a step motor, the output end thereof is coaxially fixedly connected with the worm 603 to drive the worm 603 to rotate, the worm 603 is in meshing transmission connection with the worm gear 602, so that the worm gear 602 drives the sun gear 5011 through the flat key shaft 5014 when rotating, and then drives the pitch screw 502 to rotate through the planetary gear set 501 to realize pitch changing of the roller set 2.

[0036] Preferably, the synchronous transmission mechanism 7 is further included, the synchronous transmission mechanism 7 includes a synchronous belt 701 and two synchronous wheels 702, the synchronous wheels 702 are coaxially arranged on the flat key shaft 5014, the two synchronous wheels 702 are arranged on the flat key shaft 5014 of the respective pitch changing driving mechanism on both sides respectively, and are connected and arranged on the two synchronous wheels 702 through the synchronous belt 701 to drive, so that when the second driving motor 601 on one side drives the pitch changing assembly 5, the synchronous transmission mechanism 7 drives the pitch changing assembly 5 on the other side to realize synchronous pitch changing on both sides. The synchronous belt 701 and the synchronous wheel 702 are in meshing transmission, which avoids the phenomenon of slipping, realizes accurate synchronous transmission with a constant transmission ratio, and then accurately controls the pitch changing.

[0037] Preferably, in the embodiment, the interval of the thread groove 50211 near one end of the middle part of the pitch screw 502, that is, the shortest interval, is the same as the thickness of the roller set 2. That is, when the roller set 2 is adjusted to the thread groove 50211 near one end of the middle part by the pitch changing control, each roller set 2 can be completely attached, so that the minimum cutting distance of the cutting line 3 is the thickness of the roller set 2. It should be noted that the intervals between the thread grooves 50211 refer to the intervals between adjacent thread grooves 50211, which will not be described in detail below.

[0038] Preferably, the pitch calculation formula of the thread groove 50211 is: Wherein, m refers to the same group of variable pitch thread groove group 5021 required to calculate the pitch of the thread groove 50211, n=2*m, n is also the total number of roller wheel groups 2 on a variable pitch drive mechanism; D is the maximum distance between the thread grooves 50211, and d is the minimum distance between the thread grooves 50211.

[0039] Preferably, in the present embodiment, on the same variable pitch screw 502, two groups of left and right symmetrical variable pitch thread groove groups 5021 are arranged, each group has 5 threads, a total of 10 thread grooves 50211, the left side is left-handed thread, and the right side is right-handed thread, wherein the interval distance of the converging end of the thread groove 50211, that is, the minimum distance d is 6mm, which is also the minimum cutting distance, and the thickness of the roller wheel group 2 is also 6mm; the interval distance of the farthest dispersed end of the thread groove 50211, that is, the maximum distance D is 50mm, which is also the maximum cutting distance; the total length of the variable pitch screw 502 is 456mm, and the diameter is 15mm; the calculated pitch P m mm, 66mm, 110mm, 154mm, 198mm. When calculating, the maximum pitch of one thread groove 50211 can also be calculated first, for example: P max =198mm, then the pitch of the adjacent smaller one is: P4=P5-(D-d) 154mm.

[0040] Therefore, the utility model discloses two variable pitch drive mechanisms are arranged on the both sides of the rack 1, and synchronous transmission control variable pitch is carried out through the synchronous transmission mechanism 7, so that the interval distance of the roller wheel group 2 is changed synchronously when the second drive mechanism 6 controls the variable pitch assembly 5, and then the cutting interval distance of the cutting line 3 is changed, and cutting operation is carried out, wherein the cutting line 3 is a diamond wire. Meanwhile, the first drive mechanism 4 is matched with the outer roller 202 through the driving rod 404, so that the outer roller 202 can slide along the axial direction of the driving rod 404 when the driving rod 404 transmits torque to the outer roller 202, so as to realize variable pitch. At this time, the cutting line 3 is matched with the outer roller 202 to drive rotation and realize cutting function, and the inner roller 201 is in a relatively static state. When variable pitch is implemented, the first drive mechanism 4 is stopped first, and then variable pitch is realized after the second drive mechanism 6 is adjusted and controlled. It should be noted that the second drive motor 601 needs to be powered throughout the process, so that the second drive motor 601 continuously maintains torque throughout the process, so as to further ensure the stability of the variable pitch multi-wire cutting process.

[0041] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-wire saw device for synchronous adjustment of variable spacing, comprising a frame, a roller wheel set and a cutting wire connected to the roller wheel set, characterized in that, Further comprising variable distance driving mechanisms, two groups of variable distance driving mechanisms are arranged in parallel on two sides of the frame, and a plurality of roller groups are arranged on the variable distance driving mechanisms; The variable distance driving mechanism comprises a first driving mechanism and a variable distance assembly, the roller group is arranged in connection with the first driving mechanism to drive the roller group to rotate, and the variable distance assembly is arranged in connection with each roller group to adjust the distance between each roller group on the variable distance driving mechanism; Further comprising a second driving mechanism, the second driving mechanism is arranged in connection with one side of the variable distance assembly to serve as the driving source of the variable distance assembly, and the second driving mechanism is arranged on the side of the roller group away from the output end of the first driving mechanism; further comprising a synchronous transmission mechanism, the synchronous transmission mechanism is arranged in connection between the two variable distance assemblies.

2. The apparatus of claim 1, wherein The roller group comprises an inner roller, an outer roller and a first bearing, the first bearing is arranged in connection between the outer periphery of the inner roller and the inner periphery of the outer roller, and the cutting line is arranged on the outer roller.

3. A synchronous regulating variable-pitch multi-wire saw device according to claim 2, characterized in that The first driving mechanism comprises a first driving motor, a driving base plate, a driven base plate and a plurality of driving rods, the first driving motor is fixedly mounted on the frame, the output end of the first driving motor is coaxially fixed on the driving base plate, the driven base plate is rotatably connected to the frame, the driving rods are fixedly connected between the driving base plate and the driven base plate, and a plurality of driving rods are arranged in a circumferential array on the driving base plate; the driving rods pass through the outer roller and are arranged in sliding connection.

4. The apparatus of claim 2, wherein The variable distance assembly comprises a planetary gear set and a plurality of variable distance screws, the planetary gear set is arranged coaxially with the roller group; the variable distance screws are coaxially fixed on the planetary gears of the planetary gear set; the variable distance screws are symmetrically arranged with two groups of variable distance thread grooves, the variable distance thread grooves are provided with a plurality of thread grooves with different pitches, one end of the thread grooves gradually converges to the middle part of the variable distance screw, and the other end gradually disperses away from the middle part; on the same generatrix of the variable distance screw, the thread grooves are arranged at equal intervals; the inner roller is provided with a connecting hole through which the variable distance screw passes, and a protrusion is formed on the inner side wall of the connecting hole for sliding connection with the thread groove.

5. A synchronous regulating variable-pitch multi-wire saw device according to claim 4, characterized in that The planetary gear set comprises a sun gear, a planetary gear and an inner ring gear, the inner ring gear is fixedly arranged on the frame, and a plurality of planetary gears are arranged in meshing between the sun gear and the inner ring gear; The second driving mechanism comprises a second driving motor, a worm gear and a worm, the sun gear is coaxially provided with a key shaft, the worm gear is coaxially arranged on the other end of the key shaft, the output end of the second driving motor is coaxially fixedly connected with the worm, and the worm is in transmission connection with the worm gear.

6. A synchronous regulating variable-pitch multi-wire saw device according to claim 5, characterized in that The synchronous transmission mechanism comprises a synchronous belt and two synchronous wheels, the synchronous wheels are coaxially arranged on the key shaft, and the synchronous belt is arranged in connection between the two synchronous wheels of the two variable distance driving mechanisms.

7. A synchronous regulating variable-pitch multi-wire saw device according to claim 6, characterized in that The synchronous belt and the synchronous wheel are in meshing transmission.

8. The apparatus of claim 3, wherein A second bearing is arranged in connection between the driven base plate and the frame.

9. The apparatus of claim 4, wherein The thread groove is of the same thickness as the roller wheel set at the end near the middle of the variable pitch screw rod.

10. The apparatus of claim 4, wherein the plurality of wires are simultaneously adjusted to vary the spacing between the wires. The pitch calculation formula of the thread groove is: Wherein, m refers to the thread groove required to calculate the pitch of the same group of variable pitch thread groove group, n=2·m; D is the maximum distance between the thread grooves, and d is the minimum distance between the thread grooves.

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