CN211104214U - Paper tube cutting machine - Google Patents

Abstract

The utility model discloses a paper tube cutting machine, which comprises a frame and a control system, wherein one end of the frame is provided with a mandrel fixing device and a driving device, and the other end is provided with a clamping and rotating device; the central position of the mandrel fixing device is provided with a central roller, the edge of the central roller is provided with N mandrels, N is an even number, and every two mandrels form a mandrel group; the rack is also provided with a horizontal moving device, and a cutter device is arranged above the horizontal moving device. The utility model discloses a dabber fixing device can effectively fix the dabber, avoids the dabber shake. Meanwhile, the outer side of the mandrel is fixed through the adjusting seat, the axis of the mandrel can be finely adjusted through the central adjusting screw, the mandrel can be fixed to avoid shaking, the axis of the mandrel can be adjusted, the axis of the mandrel is guaranteed to meet the requirement of the collimation degree in the machining process, and the machining quality is improved. The utility model discloses a have 4 groups 8 dabbers altogether, every group has the function of oneself respectively, cooperates two cutters, can improve the machining efficiency more than one time.

Description

Paper tube cutting machine

Technical Field

The utility model belongs to the technical field of paper tube processing equipment technique and specifically relates to a paper tube cutting machine for cutting paper tube open.

Background

The paper tube is a common product in daily life and has wide application, for example, products such as adhesive tapes, roll paper, plastic films and the like are all selected as an inner core. When the paper tube is manufactured, paper with certain thickness and hardness is matched with glue, and hard paper is wound into the paper tube on special tube winding equipment. The paper tube is long and cannot be directly applied to products such as adhesive tapes and roll paper, and therefore special paper tube cutting equipment is needed to cut the long paper tube into small paper tubes with specified lengths. However, the prior art paper tube cutting apparatus has many technical problems.

First, in the prior art, the paper tube cutting device is provided with only one or two mandrels, the diameter of each mandrel is slightly smaller than the inner diameter of each paper tube, and the paper tubes are sleeved on the mandrels and cannot swing radially to a large extent. The paper tube is cut into small sections of paper tubes with certain length by a cutter of the paper tube cutting equipment, and after one long paper tube is cut, a worker sleeves the other long paper tube on the mandrel for cutting. Because the existing paper tube cutting equipment only has one mandrel for cutting or alternatively cuts two mandrels, when the equipment is used for processing the paper tube with small diameter, the processing efficiency is very low.

Secondly, cutting equipment during operation, the paper tube is rotatory at a high speed under the drive of chuck, and the cutter is close to the paper tube and tangent with the paper tube of high-speed rotation, utilizes frictional force between the two to cut off the paper tube, but cutting machine self can't confirm when the cutter cuts off the paper tube, consequently usually sets for a great cutter amount of advancing among the prior art, ensures that the cutter has sufficient cutting volume, cuts off the paper tube completely. But the inside metal dabber that is of paper tube, the interval between paper tube inner wall and the dabber is very little moreover, and the cutter is after cutting off the paper tube, and it is very easy to collide with the dabber at the in-process that continues to advance, leads to the cutter to roll up the sword, causes the incision unsmooth in the follow-up cutting process, influences the paper tube quality, even causes and scrap to need frequently to change the cutter, reduce machining efficiency. Moreover, because cutter and dabber often collide, the cutter is with dabber surface fish tail, after a period of time, the dabber surface is scratched the trace by the cutter, causes dabber surface unevenness, leads to the paper tube to be unstable when high-speed the rotation easily, also can cause the incision unsmooth, influences the cutting quality to need to change the dabber, increase the processing cost.

SUMMERY OF THE UTILITY MODEL

The applicant provides a novel paper tube cutting machine, can cut two paper tubes simultaneously, improves machining efficiency, can respond to the position of cutter in addition, avoids cutter and dabber collision and damage, reduces the maintenance cost, improves cutting machine machining efficiency to among the current paper tube cutting machine, the machining efficiency that exists is low to and unable automated inspection cutter position, lead to cutter and dabber collision to cause the damage, influence machining efficiency, increase maintenance cost scheduling problem.

The utility model discloses the technical scheme who adopts as follows:

a paper tube cutting machine comprises a frame and a control system, wherein one end of the frame is provided with a mandrel fixing device and a driving device, and the other end of the frame is provided with a clamping rotating device; the central position of the mandrel fixing device is provided with a central roller, the edge of the central roller is provided with N mandrels, N is an even number, and every two mandrels form a mandrel group; the rack is also provided with a horizontal moving device, and a cutter device is arranged above the horizontal moving device.

As a further improvement of the above technical solution:

the mandrel fixing device comprises a first fixing disc and a second fixing disc, and the two fixing discs are connected through a connecting sleeve; the edge of the first fixed disk and the edge of the second fixed disk are provided with mandrel mounting holes, the mandrel mounting holes are provided with adjusting seats, the side surfaces of the adjusting seats are provided with central adjusting screws, and the adjusting seats are provided with central through holes communicated with the mandrel mounting holes; the mandrel is fixed in the adjusting seat and the mandrel mounting hole.

4 pin shaft holes are uniformly distributed on the edge of the first fixed disc, and two mandrels are arranged between every two pin shaft holes; the mandrel fixing device further comprises a third air cylinder, and a piston rod of the third air cylinder is connected with a fixing rod.

The diameter of the mandrel is in clearance fit with the aperture of the mandrel mounting hole, or is slightly smaller than the aperture of the mandrel mounting hole.

N is 4 or 6 or 8; the distance between two mandrels in the same mandrel group is larger than the distance between two adjacent mandrels in the two mandrel groups.

The quantity of dabber is 4, evenly distributed at the edge of fixed disk.

The cutter device comprises a second cylinder, a piston rod of the second cylinder is connected with a sliding block, the sliding block is arranged on a guide rail, and the guide rail is fixed on the base; an insulating seat is fixed on the sliding block and is provided with an insulating material, a through hole is processed in the insulating material, and a conductive connecting shaft is arranged in the through hole; one end of the connecting shaft is connected with a cutter fixing disc, a cutter is arranged on the cutter fixing disc, and the other end of the connecting shaft is connected with a cutter rotating mechanism; and a signal wire is arranged on the insulating seat, one end of the signal wire is electrically conducted with the connecting shaft, the other end of the signal wire is communicated with the control system, and the cutter is communicated with the control system through the cutter fixing disc, the connecting shaft and the signal wire in sequence.

The insulating base is provided with a metal conductive bolt, the conductive bolt penetrates through the insulating material and then contacts with the connecting shaft, and the outside of the conductive bolt is connected with a signal wire.

The cutter rotating mechanism is composed of a stepping motor and a reduction gear, and the reduction gear is made of insulating materials.

The cutter device is provided with an upper set and a lower set, and the two sets of cutter devices are fixed together.

And a bearing hole is further formed in the rack, one end of the central roller is fixed on the mandrel fixing device, and the other end of the central roller is inserted into the bearing hole and is connected with a piston rod of the fourth cylinder.

The clamping and rotating device comprises a chuck and an ejector rod behind the chuck, and the chuck is opposite to the free end of the mandrel for cutting; a conical ejector rod head is installed at one end, close to the chuck, of the ejector rod, and the other end of the ejector rod is connected with a piston rod of the first air cylinder.

The horizontal moving device comprises a second motor, an output shaft of the second motor is connected with a screw rod, connecting seats are installed at two ends of the screw rod, and the cutter device is installed on a screw rod nut.

The driving device comprises a third motor, the third motor is connected with a speed reducer, and an output shaft of the speed reducer is connected with the mandrel fixing device.

The utility model has the advantages as follows:

the utility model discloses a dabber fixing device adopts two fixed disks and dead lever around, can effectively fix the dabber, avoids the dabber shake. Meanwhile, the outer side of the mandrel is fixed through the adjusting seat, the axis of the mandrel can be finely adjusted through the central adjusting screw, the mandrel can be fixed to avoid shaking, the axis of the mandrel can be adjusted, the axis of the mandrel is guaranteed to meet the requirement of the collimation degree in the machining process, and the machining quality is improved.

The utility model discloses a have 4 groups 8 dabbers altogether, every group has the function of oneself respectively, cooperates two cutters, not only can make things convenient for the operator to operate, compares prior art moreover, can improve the machining efficiency more than one time.

The utility model discloses a cutters installs the cutter on the insulator seat, constitutes the electric current route in the twinkling of an eye when cutter and dabber contact, produces the electric current in the whole route, and after control system listened the current signal, control the cutter immediately and return, can avoid cutter and dabber bump, prevent to damage the cutting edge of cutter and the surface of dabber, improve the life of cutter and dabber, reduce the production and processing cost to can reduce the change number of times, improve production efficiency greatly.

The utility model discloses a cutters installs cutter slewing mechanism, in the course of working, after the cutting edge operation certain time of a position of cutter or cutting a certain quantity, cutter slewing mechanism drives the cutter and rotates certain angle, makes new cutting edge part aim at the paper tube and cuts, avoids all the time with the cutting edge cutting of a position, improves the life of cutter.

Drawings

Fig. 1 is a front view of the paper tube cutting machine of the present invention.

Fig. 2 is a right side view of the paper tube cutting machine of the present invention.

Fig. 3 is a top view of the paper tube cutting machine of the present invention, in which the clamping and rotating device is not shown.

Fig. 4 is a schematic structural view of the clamping and rotating device of the present invention.

Fig. 5 is a schematic structural diagram of the driving device and the mandrel fixing device of the present invention.

Fig. 6 is a perspective view of the mandrel and the mandrel fixing device of the present invention.

Fig. 7 is a right side view of fig. 6.

Fig. 8 is an enlarged view of the mandrel fixing structure of fig. 5.

Fig. 9 is a schematic diagram of the cutter device and the mandrel of the present invention.

Fig. 10 is a plan view of the cutter device of the present invention.

Fig. 11 is a cross-sectional view taken along direction AA of fig. 10, showing the structure of only one cutter.

Fig. 12 is a cross-sectional view taken along direction BB in fig. 10, showing only the structure of one cutter.

In the figure: 1. a frame; 2. a clamping and rotating device; 3. a cutter device; 4. a horizontal moving device; 5. a mandrel fixing device; 6. a drive device; 7. a control system; 8. a mandrel; 9. a center roller; 10. a mandrel group; 21. a claw; 22. a head of the ejector; 23. a top rod; 24. a first cylinder; 25. a first motor; 26. a transmission belt; 27. a driven wheel; 28. a bearing bore; 29. a fourth cylinder; 31. a cutter; 32. a second cylinder; 33. a cutter rotating mechanism; 34. an insulating base; 35. a connecting shaft; 36. a conductive bolt; 37. a signal line; 39. fixing the bolt; 40. a base; 41. a cutter fixing disc; 42. a second motor; 43. a screw rod; 44. a connecting seat; 45. a guide rail; 46. a slider; 51. a first fixed disk; 52. a second fixed disk; 53. connecting sleeves; 54. a pin shaft hole; 55. a third cylinder; 56. fixing the rod; 57. an adjusting seat; 58. a center adjustment screw; 59. a bolt; 61. a third motor; 62. and a speed reducer.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

As shown in fig. 1 and 3, the utility model discloses a paper tube cutting machine's overall structure, including frame 1 and control system 7, dabber fixing device 5 and drive arrangement 6 are installed to the one end of frame 1, and the tight rotary device 2 of other end installation clamp, and drive arrangement 6 is connected certainly with dabber fixing device 5 for drive dabber fixing device 5 rotates and horizontal migration, can play the effect of fixed dabber fixing device 5 position simultaneously. The central position of dabber fixing device 5 installs central roller 9, and many dabbers 8 are installed to the edge, and the one end fixed mounting of dabber 8 is on dabber fixing device 5, and the other end just presss from both sides tight rotary device 2. Still install horizontal migration device 4 on the frame 1, horizontal migration device 4 installs cutters 3 in the top, and horizontal migration device 4 can drive cutters 3 and carry out horizontal migration, and through removing certain distance at every turn, cutters 3 cuts the paper tube of suit on dabber 8, forms the little paper tube of certain length.

As shown in fig. 5, the driving device 6 of the present invention includes a third motor 61, the third motor 61 is connected to a speed reducer 62, and an output shaft of the speed reducer 62 is connected to an outer side of the first fixing plate 51 of the spindle fixing device 5. The third motor 61 is decelerated by the decelerator 62 and used for driving the mandrel fixing device 5 to rotate precisely, for example, by 90 degrees. As shown in fig. 5 to 8, the mandrel fixing device 5 of the present invention includes a first fixed disk 51 on the left side and a second fixed disk 52 on the right side, and the two fixed disks are connected together by a connecting sleeve 53. The central roller 9 is installed at the central position of the mandrel fixing device 5, and one end of the central roller 9 can be fixed at the central position of the second fixing disc 52 or can pass through the second fixing disc 52 to be fixed by the two fixing discs. The edges of the first fixed disk 51 and the second fixed disk 52 are respectively provided with 8 mandrel mounting holes and 4 pin shaft holes 54, the 4 pin shaft holes 54 are uniformly distributed at the edge of the fixed disk at 90 degrees, and two mandrel mounting holes are arranged between every two pin shaft holes 54. An adjusting seat 57 is installed at the position of each mandrel installation hole, the adjusting seat 57 is provided with a central through hole, the through hole is communicated with the mandrel installation hole, and the adjusting seat 57 is fixed on the fixed disc through a bolt 59. The mandrel 8 is arranged in the adjusting seat 57 and the mandrel mounting hole in a penetrating mode, and the mandrel 8 is fixed through a plurality of central adjusting screws 58 on the periphery of the adjusting seat 57. The diameter of the mandrel 8 is in clearance fit with the aperture of the mandrel mounting hole, or the aperture of the mandrel mounting hole is slightly smaller.

As shown in fig. 5, the mandrel fixing device 5 of the present invention further includes a third cylinder 55, the piston rod of the third cylinder 55 is connected with a fixing rod 56, the diameter of the fixing rod 56 is slightly smaller than the diameter of the pin hole 54, and the third cylinder 55 can push the fixing rod 56 into the pin hole 54 of the first fixing plate 51. The utility model discloses a cutting machine during operation, drive arrangement 6 drive dabber fixing device 5 rotate to wait to cut the position after, dead lever 56 just right with one of them round pin shaft hole 54, and third cylinder 55 pushes away round pin shaft hole 54 with dead lever 56, can play the effect of fixed dabber fixing device 5 and dabber 8 position, avoids in cutting process, and dabber 8 deflects and leads to the paper tube cutting unusual.

When the paper tube cutting machine performs cutting processing, the paper tube sleeved on the mandrel 8 needs to rotate at a high speed and is tangent to the cutter to complete cutting, so that the requirement on the collimation degree of the axis of the mandrel 8 is very high, if the axis of the mandrel 8 deviates, the paper tube shakes at a high speed, the processing quality of the paper tube notch flatness and the paper tube is affected, and even the cutter collides with the mandrel 8 to damage the mandrel 8 and the cutter. Therefore, the utility model discloses a two fixed disk installation dabbers 8 around can prevent that dabber 8 from taking place the shake in the cutting machine course of work. And simultaneously, the utility model discloses a central adjusting screw 58 both can be in the same place dabber 8 with adjusting seat 57 is fixed, simultaneously, through the distance of adjusting different central adjusting screws 58, also can realize the fine setting of dabber 8 axis for the axis of dabber 8 accords with the requirement of collimation degree in the course of working. Moreover, the fixed disc is positioned by the fixed rod 56, so that the whole mandrel fixing device 5 can be prevented from shaking, and the mandrel 8 is ensured not to deflect in the machining process.

In the present embodiment, the number of the mandrels 8 is N, N is an even number, and preferably 4, 6 or 8, and every two mandrels 8 form a mandrel group 10 for cutting 2 paper tubes at the same time. The utility model discloses a two sets of cutters about cutters 3 installed, but because the restriction of cutter size, for the installation cutters 3 of being convenient for, the utility model discloses the distance of two dabbers 8 of well same dabber group 10 is greater than the distance between two dabbers 8 that dabber group 10 is adjacent.

Referring to fig. 9, during the operation of the paper tube cutting machine, 4 sets of mandrel groups 10 are formed by 8 mandrels and have different functions respectively, one set of mandrel group 10 is formed by two mandrels 8 vertically arranged on the right side, one paper tube is sleeved on each mandrel 8, the cutter device 3 is provided with an upper cutter and a lower cutter, two paper tubes can be cut simultaneously, and the cutting efficiency is doubled compared with that of a single paper tube in the prior art. The top mandrel set 10 has been sleeved with two paper tubes to be cut. The left mandrel group 10 faces the operator, when the cutting machine cuts the right paper tube, the operator takes down the small paper tube which is cut previously and carries out preliminary inspection, and meanwhile, a new long paper tube is sleeved on the mandrel 8. And the two mandrels 8 of the mandrel group 10 positioned at the lowest part are sleeved with small paper tubes which are cut, but the two mandrels are positioned at the lowest part, so that the operation is inconvenient and the two mandrels are used as transition areas. After two paper tubes on the right side are cut, the control system 7 of the cutting machine controls the third motor 61 to work, the speed is reduced through the speed reducer 62, the mandrel fixing device 5 is driven to rotate 90 degrees accurately, the mandrel group 10 on the top of the mandrel fixing device rotates to the right side at the moment, the next group of cutting is carried out, and meanwhile, the other 3 groups of mandrel groups 10 also rotate to the next procedure.

The utility model discloses preferably adopt 4 8 dabbers of group, every group has the function of oneself respectively, not only can make things convenient for the operator to operate, and the cooperation has the cutters 3 of two sets of cutters moreover, can improve the machining efficiency more than one time.

Of course, the utility model discloses also can adopt 4 dabbers, 4 dabbers evenly distributed are at the edge of fixed disk, and the effect of 4 dabbers is the same with the effect of above-mentioned 4 dabbers group 10 respectively, but compares 8 dabbers, and cutting efficiency can be doubled slowly.

Of course, the number of the mandrels may be N, where N is an even number and N ≧ 4, and each two mandrels 8 form a mandrel group 10, for example, only the mandrel group 10 for feeding and discharging on the left side and the mandrel group 10 for cutting on the right side.

As shown in fig. 3, the horizontal movement device 4 of the present invention includes a second motor 42, an output shaft of the second motor 42 is connected to a lead screw 43, connecting seats 44 are installed at both ends of the lead screw 43, and the cutter device 3 is installed on the lead screw nut. When the second motor 42 works, the cutter device 3 is driven to move horizontally by the screw rod 43. The length of the paper tube product is set in the cutting machine control system 7, after the cutting device 3 finishes one-time cutting, the horizontal moving device 4 drives the cutting device 3 to horizontally move for the distance which is the same as the length of the paper tube product, next cutting is carried out, and the whole long paper tube is cut in sequence. After the whole long paper tube is cut, the horizontal moving device 4 drives the cutter device 3 to return to the initial position to prepare for cutting the next long paper tube.

As shown in fig. 9, the cutter device 3 of the present invention includes an upper cutter and a lower cutter, and the two cutters are fixed together. Taking the above cutter as an example, as shown in fig. 10, 11 and 12, the cutter device 3 includes the second cylinder 32, the piston rod of the second cylinder 32 is connected with the slider 46, the slider 46 is mounted on the guide rail 45, and the guide rail 45 is fixed on the base 40. The insulating seat 34 is mounted above the sliding block 46 through a fixing bolt 39, and the insulating seat 34 is made of insulating materials. The insulating base 34 is provided with a central through hole perpendicular to the axis of the second cylinder 32 in the horizontal direction, a connecting shaft 35 is arranged in the central through hole, the connecting shaft 35 can conduct electricity, one end of the connecting shaft is provided with a cutter rotating mechanism 33, the other end of the connecting shaft is connected with a cutter fixing disc 41, and a cutter 31 is arranged on the cutter fixing disc 41. In this embodiment, the cutter rotating mechanism 33 is composed of a stepping motor and a reduction gear, the reduction gear is made of an insulating material to ensure that the connecting shaft 35 is electrically isolated from the stepping motor, and the cutter rotating mechanism 33 is used for driving the connecting shaft 35 and the cutter 31 to rotate by a certain angle. A metal conductive bolt 36 is arranged above the insulating seat 34, the conductive bolt 36 penetrates through the upper half part of the insulating seat 34 and is in contact with the connecting shaft 35, meanwhile, a signal wire 37 is connected to the outside of the conductive bolt 36, the signal wire 37 is connected with the control system 7, and a safety voltage is controlled and applied through the control system 7. Through the above structure, the signal line 37 is communicated with the cutter 31 sequentially through the conductive bolt 36, the connecting shaft 35 and the cutter fixing disc 41.

When the cutter device 3 starts to work, the cutter 31 is not in contact with the paper tube, and the voltage is applied to the cutter 31, but no current flows. The second cylinder 32 pushes the slide block 46 and the cutter 31 to move to the position of the mandrel 8, and the slide block and the cutter are tangent to the paper tube rotating at high speed to cut the paper tube. After the paper tube is cut, the cutter 31 continues to move forward, and when the cutter 31 contacts the mandrel 8, the mandrel 8 is made of metal material, and a passage is formed through the whole cutting machine. Therefore, the moment the cutting knife 31 contacts the mandrel 8 forms a current path, current flows in the whole path, and at the moment, current also flows in the signal wire 37, and the control system 7 controls the second air cylinder 32 to retreat immediately after detecting the current signal of the signal wire 37, so that the cutting knife 31 retreats to the initial position. Through the insulation of above difference and conductive structure's cooperation, control system 7 can just monitor the electric current in the twinkling of an eye at cutter 31 and the contact of dabber 8, and control cutter 31 returns, and cutter 31 can not collide with dabber 8, avoids damaging the cutting edge of cutter 31 and the surface of dabber 8, improves the life of cutter 31 and dabber 8, reduces the production and processing cost to can reduce the change number of times, improve production efficiency greatly.

In the process of cutting the paper tube, because the cutter 31 does not need to rotate at a high speed, if the paper tube is cut at one position of the cutter 31 all the time, the blade of the cutter 31 is inevitably curled, and the quality of the cut of the paper tube is influenced. The utility model discloses a set up cutter slewing mechanism 33, after the cutting edge operation certain time of cutter 31 a position perhaps cuts a certain quantity, cutter slewing mechanism 33 drives cutter 31 and rotates certain angle, makes new cutting edge part aim at the paper tube and cuts, avoids cutting with the cutting edge of a position all the time, improves cutter 31's life.

As shown in fig. 4, the utility model discloses a press from both sides tight rotary device 2 and be used for pressing from both sides tight paper tube to drive the paper tube and carry out high-speed rotation, ejector pin 23 including two chucks and chuck rear, two chucks are just being used for the free end of two dabbers 8 of cutting process, every chuck has two at least jack catchs 21, jack catch quantity is preferred three or four, conical ejector pin head 22 is installed to the one end of ejector pin 23 next-door neighbour chuck, the piston rod of first cylinder 24 is connected to the other end, first cylinder 24 can promote ejector pin 23 horizontal migration, be used for jack-up jack catch 21, the tight paper tube that is pressed from both sides is released.

As shown in fig. 2, the clamping and rotating device 2 of the present invention further includes a first motor 25, the first motor 25 is connected to two driven wheels 27 through a transmission belt 26 or a gear box, the driven wheels 27 are connected to the chuck, and the connection structure between the driven wheels 27 and the chuck is a conventional technology, which is not specifically explained in the present invention. In operation, the first motor 25 drives the chuck and the paper tube clamped by the chuck to rotate at high speed through the driven wheel 27, thereby completing the cutting process. The frame 1 beside the driven wheel 27 is also provided with a bearing hole 28, one end of the central roller 9 is fixed on the mandrel fixing device 5, and the other end is inserted into the bearing hole 28 and connected with a piston rod of a fourth air cylinder 29. Through the location of dabber fixing device 5 and dead eye 28, can guarantee that center roller 9 is stable at cutting machine axis of operation, and then ensure that the axis of dabber 8 on dabber fixing device 5 does not take place the skew, improve cutting quality. After the paper tube is cut, the paper tube is loosened by the clamping jaws 21, the fourth air cylinder 29 pushes the central roller 9 and the mandrel fixing device 5 to move horizontally in the direction away from the chuck, the free end of the mandrel 8 and the paper tube leave the chuck, then the mandrel fixing device 5 rotates by 90 degrees, the next group of mandrels 8 enter a cutting station, the fourth air cylinder 29 pulls the central roller 9 and the mandrel fixing device 5 to enable the free end of the mandrel 8 and the paper tube to enter the position clamped by the chuck, and the paper tube is clamped by the clamping jaws 21 to be cut next time.

The above description is illustrative of the present invention and is not intended to limit the present invention, and the present invention may be modified in any manner without departing from the spirit of the present invention.

Claims (14)

1. A paper tube cutting machine is characterized in that: the device comprises a rack (1) and a control system (7), wherein one end of the rack (1) is provided with a mandrel fixing device (5) and a driving device (6), and the other end of the rack is provided with a clamping rotating device (2); a central roller (9) is arranged at the central position of the mandrel fixing device (5), N mandrels (8) are arranged at the edge of the central roller, N is an even number, and every two mandrels (8) form a mandrel group (10); the machine frame (1) is also provided with a horizontal moving device (4), and a cutter device (3) is arranged above the horizontal moving device (4).

2. The paper tube cutting machine according to claim 1, characterized in that: the mandrel fixing device (5) comprises a first fixed disk (51) and a second fixed disk (52), and the two fixed disks are connected through a connecting sleeve (53); the edge of the first fixed disk (51) and the edge of the second fixed disk (52) are provided with mandrel mounting holes, the mandrel mounting holes are provided with adjusting seats (57), the side surfaces of the adjusting seats (57) are provided with central adjusting screws (58), and the adjusting seats (57) are provided with central through holes communicated with the mandrel mounting holes; the mandrel (8) is fixed in the adjusting seat (57) and the mandrel mounting hole.

3. The paper tube cutting machine according to claim 2, characterized in that: 4 pin shaft holes (54) are uniformly distributed on the edge of the first fixed disc (51), and two mandrels (8) are arranged between every two pin shaft holes (54); the mandrel fixing device (5) further comprises a third air cylinder (55), and a piston rod of the third air cylinder (55) is connected with a fixing rod (56).

4. The paper tube cutting machine according to claim 2, characterized in that: the diameter of the mandrel (8) is in clearance fit with the aperture of the mandrel mounting hole, or is slightly smaller than the aperture of the mandrel mounting hole.

5. The paper tube cutting machine according to claim 1, characterized in that: n is 4 or 6 or 8; the distance between two mandrels (8) of the same mandrel group (10) is larger than the distance between two mandrels (8) adjacent to the two mandrel groups (10).

6. The paper tube cutting machine according to claim 1, characterized in that: the number of the mandrels (8) is 4, and the mandrels are uniformly distributed on the edge of the fixed disk.

7. The paper tube cutting machine according to claim 1, characterized in that: the cutter device (3) comprises a second air cylinder (32), a piston rod of the second air cylinder (32) is connected with a sliding block (46), the sliding block (46) is installed on a guide rail (45), and the guide rail (45) is fixed on the base (40); an insulating seat (34) is fixed on the sliding block (46), the insulating seat (34) is provided with insulating materials, through holes are processed in the insulating materials, and a conductive connecting shaft (35) is installed in the through holes; one end of the connecting shaft (35) is connected with a cutter fixing disc (41), a cutter (31) is installed on the cutter fixing disc (41), and the other end of the connecting shaft (35) is connected with a cutter rotating mechanism (33); a signal wire (37) is mounted on the insulating seat (34), one end of the signal wire (37) is electrically conducted with the connecting shaft (35), the other end of the signal wire (37) is communicated with the control system (7), and the cutter (31) is communicated with the control system (7) sequentially through the cutter fixing disc (41), the connecting shaft (35) and the signal wire (37).

8. The paper tube cutting machine according to claim 7, characterized in that: the insulating base (34) is provided with a metal conductive bolt (36), the conductive bolt (36) penetrates through an insulating material and then contacts with the connecting shaft (35), and the outside of the conductive bolt (36) is connected with a signal wire (37).

9. The paper tube cutting machine according to claim 7, characterized in that: the cutter rotating mechanism (33) is composed of a stepping motor and a reduction gear, and the reduction gear is made of insulating materials.

10. The paper tube cutting machine according to claim 7, characterized in that: the cutter device is provided with an upper set and a lower set, and the two sets of cutter devices are fixed together.

11. The paper tube cutting machine according to claim 1, characterized in that: and a bearing hole (28) is further formed in the rack (1), one end of the central roller (9) is fixed on the mandrel fixing device (5), and the other end of the central roller is inserted into the bearing hole (28) and is connected with a piston rod of a fourth cylinder (29).

12. The paper tube cutting machine according to claim 1, characterized in that: the clamping and rotating device (2) comprises a chuck and an ejector rod (23) behind the chuck, and the chuck is over against the free end of the mandrel (8) for cutting; one end of the ejector rod (23) close to the chuck is provided with a conical ejector rod head (22), and the other end of the ejector rod is connected with a piston rod of a first air cylinder (24).

13. The paper tube cutting machine according to claim 1, characterized in that: the horizontal moving device (4) comprises a second motor (42), an output shaft of the second motor (42) is connected with a screw rod (43), connecting seats (44) are installed at two ends of the screw rod (43), and the cutter device (3) is installed on a screw rod nut.

14. The paper tube cutting machine according to claim 1, characterized in that: the driving device (6) comprises a third motor (61), the third motor (61) is connected with a speed reducer (62), and an output shaft of the speed reducer (62) is connected with the mandrel fixing device (5).

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