CN109434904B

CN109434904B - Precise cutting method for teflon tube

Info

Publication number: CN109434904B
Application number: CN201811250745.8A
Authority: CN
Inventors: 李鲜元
Original assignee: Xinyi Xiyi High Tech Material Industry Technology Research Institute Co Ltd
Current assignee: Dawei Machine Tool Jiangsu Co ltd
Priority date: 2017-03-21
Filing date: 2017-03-21
Publication date: 2021-11-12
Anticipated expiration: 2037-03-21
Also published as: CN109434904A; CN107052432B; CN107052432A

Abstract

The invention provides a precise cutting method of a Teflon tube, which comprises the following steps: A. inserting: inserting the head of the Teflon pipe into the conveying mechanism through the cooling water tank; B. conveying and clamping: the conveying mechanism works to convey the Teflon tubes with fixed length into the clamping mechanism and is clamped; C. rotating: the cutting mechanism rotates; D. cutting and returning: the cutting driving mechanism works to drive the cutting mechanism to move forwards to the clamping mechanism to cut off the Teflon pipe and return; E. loosening: the clamping mechanism works to loosen the clamped Teflon pipe; F. and (5) conveying and ejecting: the conveying mechanism works again to convey the Teflon tubes with fixed length into the clamping mechanism, and meanwhile, the Teflon tubes conveyed upwards push the cut Teflon tubes upwards; G. and (3) re-clamping: the clamping mechanism works to clamp the Teflon tube; and D, returning to the step D, and repeating the cutting. The invention can effectively improve the length precision of the cut pipe, has good incision quality, and reduces or even eliminates the bending or flattening condition of the pipe.

Description

Precise cutting method for teflon tube

Technical Field

The invention relates to the technical field of industrial mechanical automation, in particular to a precise cutting method for a teflon pipe.

Background

In the operation is cut off to the teflon tubule, to a type tubular product, need cut the nozzle stub of multiple specific length usually, will guarantee tubular product length precision and incision quality and tubular product surface can not have the trace of bending or flattening, and the incision will level and smooth.

At present, for cutting a Teflon thin tube with a specific length, a roller is adopted for feeding materials, and then a blade is used for cutting the Teflon thin tube. Because the feeding is realized by pressing the thin tube through the roller, the contact surface is small, the pressure is manually adjusted and is not well controlled, the thin tube is hard and is easy to bend or flatten, or slips and deviates, the cutting length and precision are difficult to guarantee, the notch quality is poor, the oblique opening is easy to cut, the smaller the diameter of the thin tube is, the higher the feeding difficulty is, and the material waste caused by bending or flattening the thin tube is huge.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

Aiming at the prior art, the invention aims to provide a precise cutting method of a Teflon tube, which can effectively improve the length precision of the tube, has good incision quality and reduces or even eliminates the bending or flattening condition of the tube.

In order to solve the technical problem, the invention provides a precise cutting method of a teflon tube, which comprises the following steps:

A. inserting: inserting the head of the Teflon pipe into the conveying mechanism through the cooling water tank;

B. conveying and clamping: the conveying mechanism works to convey the Teflon tubes with fixed length into the clamping mechanism and is clamped;

C. rotating: the cutting mechanism rotates;

D. cutting and returning: the cutting driving mechanism works to drive the cutting mechanism to move forwards to the clamping mechanism to cut off the Teflon pipe and return;

E. loosening: the clamping mechanism works to loosen the clamped Teflon pipe;

F. and (5) conveying and ejecting: the conveying mechanism works again to convey the Teflon tubes with fixed length into the clamping mechanism, and meanwhile, the Teflon tubes conveyed upwards push the cut Teflon tubes upwards;

G. and (3) re-clamping: the clamping mechanism works to clamp the Teflon tube;

and D, returning to the step D, and repeating the cutting.

In a further improvement of the present invention, step B comprises the following substeps:

B1. the conveying motor drives the second belt to rotate through belt transmission;

B2. the second belt drives a third belt to convey the fixed-length Teflon tubes upwards together into the two clamping plates through the Teflon tubes;

B3. the finger cylinder works to drive the two clamping plates to clamp the Teflon tube.

In a further improvement of the present invention, step D comprises the following substeps:

D1. the linear motor drives the rotating cutting blade to move forwards through the slide block guide rail to the notch to cut off the Teflon tube;

D2. after cutting, the linear motor drives the rotating cutting blade to return together.

In a further improvement of the present invention, step F comprises the following substeps:

F1. the conveying motor works again to drive the second belt to rotate through belt transmission;

F2. the second belt drives a third belt to convey the fixed-length Teflon tubes upwards together into the two clamping plates through the Teflon tubes;

F3. meanwhile, the cut Teflon tubes are ejected upwards by the upward conveyed Teflon tubes.

Compared with the prior art, the cutting driving mechanism drives the cutting mechanism to cut off the Teflon tubes in the clamping mechanism. The invention also provides a precise cutting method of the Teflon tube, which comprises the following steps: A. inserting; B. conveying and clamping; C. rotating; D. cutting and returning; E. loosening; F. then conveying and ejecting; G. then clamping; and D, returning to the step D, and repeating the cutting. The invention can effectively improve the length precision of the cut pipe, has good incision quality, and reduces or even eliminates the bending or flattening condition of the pipe.

Drawings

FIG. 1 is a perspective view of an embodiment of the present invention;

fig. 2 is a combined perspective view of a base, a cooling water tank, a conveying mechanism, a clamping mechanism, a cutting mechanism and a cutting driving mechanism according to a first embodiment of the invention;

FIG. 3 is a perspective expanded view of FIG. 2 with the base removed;

FIG. 4 is a perspective view of a conveyor motor, a conveyor motor mounting plate, and a driving hose conveying assembly according to a first embodiment of the present invention;

FIG. 5 is a perspective expanded view of a driven roller tube assembly according to a first embodiment of the present invention;

FIG. 6 is a perspective exploded view of a clamping mechanism according to a first embodiment of the present invention;

FIG. 7 is a perspective exploded view of a cutting mechanism according to a first embodiment of the present invention;

fig. 8 is a perspective view of a clamping mechanism according to a second embodiment of the present invention;

FIG. 9 is a perspective expanded view of FIG. 8;

FIG. 10 is a flow chart of a method for precisely cutting a Teflon tube according to the present invention.

The names of the components in the figure are as follows:

1-a base;

2-a cooling water tank;

3, a conveying mechanism;

31-a conveying motor;

32-conveying motor mounting plate;

33-driving the tube conveying assembly;

3301 — first synchronizing wheel;

3302 — second synchronizing wheel;

3303-synchronous belt;

3304 — first drive wheel;

3305 — second drive wheel;

3306 — second belt;

3307 — first pin;

3308 — second pin;

3309 — driving wheel mounting block;

3310-third driven wheel;

3311 — first tensioning wheel;

34-a driven wheel tube-in-tube assembly;

341-first driven wheel;

342-a second driven wheel;

343-third belt;

344 — driven wheel mounting block;

345 — a fourth driven wheel;

346 — second tensioning wheel;

4, a clamping mechanism;

41-finger cylinder;

42-finger cylinder mounting seat;

43-a clamping plate;

431-circular arc groove;

432-a gap;

44-a main clamping block;

45-auxiliary clamping block;

46-a main clamping mounting block;

5, a cutting mechanism;

51, a backing plate;

52-a cutting motor;

53-cutting the motor mounting plate;

54 — a first pulley;

55-a second pulley;

56 — a first belt;

57-a rotating shaft;

58-rotating shaft mounting base;

59-cutting the slices;

6-a cutting driving mechanism;

61-linear motor;

62-linear motor mounting plate;

63-a slide block;

64-a guide rail;

7-a support frame;

71-a support column;

72-a top plate;

73-a base plate;

8-Teflon tube.

Detailed Description

The invention is further described with reference to the following description and embodiments in conjunction with the accompanying drawings.

The invention discloses a precise cutting device for a teflon tube, which has the following implementation mode:

as shown in fig. 1, a precision cutting device for teflon pipes comprises a base 1, a cooling water tank 2, a conveying mechanism 3, a clamping mechanism 4, a cutting mechanism 5, a cutting driving mechanism 6 and a supporting frame 7, wherein the supporting frame 7 is provided with at least 2 supporting columns 71; the cooling water tank 2, the conveying mechanism 3, the clamping mechanism 4 and the cutting driving mechanism 6 are respectively and fixedly arranged on the base 1, the cutting mechanism 5 is fixedly arranged on the cutting driving mechanism 6, and the base 1 is fixedly arranged on the supporting column 71; the Teflon tube 8 penetrates through the cooling water tank 2 and is inserted into the conveying mechanism 3, the conveying mechanism 3 conveys the Teflon tube 8 with the fixed length into the clamping mechanism 4 and is clamped, and the cutting driving mechanism 6 drives the cutting mechanism 5 to cut off the Teflon tube 8 in the clamping mechanism 4.

Specifically, as shown in fig. 2 to 5, the cooling water tank 2 is fixedly installed on the base 1, and the cooling water tank 2 can reduce the temperature of the teflon pipe 8, so that the teflon pipe 8 becomes harder. The conveying mechanism 3 comprises a conveying motor 31, a conveying motor mounting plate 32, a driving wheel pipe conveying assembly 33 and a driven wheel pipe conveying assembly 34, the conveying motor 31 is fixedly mounted on the conveying motor mounting plate 32, the conveying motor mounting plate 32 and the driving wheel pipe conveying assembly 33 are respectively and fixedly mounted on the base 1, the driven wheel pipe conveying assembly 34 is fixedly mounted on the driving wheel pipe conveying assembly 33, an output shaft of the conveying motor 31 is in driving connection with the driving wheel pipe conveying assembly 33, and the conveying motor 31 adopts a servo motor. The driving wheel pipe conveying assembly 33 comprises a first synchronizing wheel 3301, a second synchronizing wheel 3302, a synchronizing belt 3303, a first driving wheel 3304, a second driving wheel 3305, 2 second belts 3306, a first pin 3307, a second pin 3308, a driving wheel mounting block 3309, the driving wheel mounting block 3309 is fixedly installed on the base 1, the first pin 3307 passes through the lower end of the driving wheel mounting block 3309 and is fixedly connected with the output shaft of the conveying motor 31, the second pin 3308 passes through the upper end of the driving wheel mounting block 3309 and is rotatably connected therewith, the first pin 3307 is rotatably connected with the driving wheel mounting block 3309, the first synchronizing wheel 3301 is fixedly installed at one end of the first pin 3307, the second synchronizing wheel 3302 is fixedly installed at one end of the second pin 3308, the synchronizing belt 3303 is in belt transmission connection with the first synchronizing wheel 3301 and the second synchronizing wheel 3302, the first driving wheel 3304 is fixedly installed at the other end of the first pin 3307, the second driving wheel 3305 is fixedly installed at the other end of the second pin 3308, the second belt 3306 is in belt transmission connection with the first pin 3307 and the second pin 3308. The capstan tube assembly 33 further comprises 4 third driven wheels 3310, a first tensioning wheel 3311, 4 third driven wheels 3310 rotatably mounted in a line on the outer side of the capstan mounting block 3309, a first tensioning wheel 3311 rotatably mounted on the inner side of the capstan mounting block 3309, and a first tensioning wheel 3311 for tensioning 2 second belts 3306. The driven wheel pipe-feeding assembly 34 comprises a first driven wheel 341, a second driven wheel 342, 2 third belts 343 and a driven wheel mounting block 344, wherein the driven wheel mounting block 344 is fixedly mounted on the base 1, the first driven wheel 341 is rotatably mounted at the lower end of the driven wheel mounting block 344, the second driven wheel 342 is rotatably mounted at the upper end of the driven wheel mounting block 344, and the third belts 343 are in belt transmission connection with the first driven wheel 341 and the second driven wheel 342. The driven wheel pipe-feeding assembly 34 further comprises 4 fourth driven wheels 345 and a second tensioning wheel 346, wherein the 4 fourth driven wheels 345 are arranged in a straight line and rotatably mounted on the inner side edge close to the driven wheel mounting block 344, the second tensioning wheel 346 is rotatably mounted on the outer side edge close to the driven wheel mounting block 344, and the second tensioning wheel 346 is used for tensioning 2 third belts 343. The second belt 3306 and the third belt 343 are both circular belts made of rubber. The distance between the driving wheel mounting block 3309 and the driven wheel mounting block 344 is adjusted, so that the space enclosed by the 2 second belts 3306 and the 2 third belts 343 can just elastically accommodate the lower teflon tube 8, and the teflon tube 8 is clamped by the 2 second belts 3306 and the 2 third belts 343 in 4 directions of the outer circle, and the clamping mode can reduce or even eliminate the condition that the pipe is bent or flattened.

Specifically, as shown in fig. 2, 3 and 6, the clamping mechanism 4 includes a finger cylinder 41, a finger cylinder mounting seat 42 and a clamping plate 43; the front surface of the clamping plate 43 is provided with an arc-shaped groove 431 for clamping the Teflon tube 8, the arc-shaped groove 431 is designed according to the pipe diameter of the Teflon tube 8, and a soft material (such as rubber and the like) is arranged in the arc-shaped groove 431 for clamping the Teflon tube 8 so as not to deform; the side surface of the clamping plate 43 is provided with notches 432 for cutting, and the notches 432 are designed according to the length of the cut teflon tube 8, and can be uniformly designed in a plurality of numbers, namely 12 in the first embodiment of the invention; the finger cylinder 41 is fixedly mounted on the finger cylinder mounting seat 42, the finger cylinder mounting seat 42 is fixedly mounted on the base 1, and the clamping plate 43 is fixedly mounted on two fingers of the finger cylinder 41. The front surfaces of the two clamping plates 43 are provided with the arc-shaped grooves 431, soft materials are arranged in the arc-shaped grooves 431 to clamp the Teflon tubes 8, and the Teflon tubes 8 are stressed in the outer circumferential direction, so that the Teflon tubes 8 can be firmly clamped without deforming, the condition that the tubes are bent or flattened can be eliminated by the clamping mode, and the clamping is reliable and firm.

Specifically, as shown in fig. 2, 3 and 7, the cutting mechanism 5 includes a backing plate 51, a cutting motor 52, a cutting motor mounting plate 53, a first belt pulley 54, a second belt pulley 55, a first belt 56, a rotating shaft 57, 2 rotating shaft mounting seats 58, and a plurality of cutting blades 59, wherein the number of the cutting blades 59 is 12 according to the number of the cutting at one time; two ends of a rotating shaft 57 are respectively rotatably mounted on 2 rotating shaft mounting seats 58, the cutting motor mounting plate 53 and the rotating shaft mounting seats 58 are respectively and fixedly mounted on the backing plate 51, the cutting motor 52 is fixedly mounted on the cutting motor mounting plate 53, the first belt pulley 54 is fixedly mounted on an output shaft of the cutting motor 52, the second belt pulley 55 is fixedly mounted at one end of the rotating shaft 57, the first belt 56 is in belt transmission connection with the first belt pulley 54 and the second belt pulley 55, and 12 cutting pieces 59 are uniformly and fixedly mounted on the rotating shaft 57. The cutting motor 52 is a speed-adjustable motor. The rotary cutting blade 59 vertically cuts the Teflon tube 8 clamped by the two clamping plates 43, so that the cut is flat and good in quality.

Specifically, as shown in fig. 2 and 3, the cutting driving mechanism 6 includes a linear motor 61, a linear motor mounting plate 62, 4 sliding blocks 63, and 2 guide rails 64, the linear motor 61 is fixedly mounted on the linear motor mounting plate 62, the linear motor mounting plate 62 and the 2 guide rails 64 are respectively fixedly mounted on the base 1, the 4 sliding blocks 63 are respectively fixedly mounted on the backing plate 51, the backing plate 51 is fixedly connected with an output shaft of the linear motor 61, and the 4 sliding blocks 63 are respectively slidably connected with the 2 guide rails 64. The linear motor 61 is a through type stepping linear motor.

Specifically, as shown in fig. 1, the supporting frame 7 includes 4 supporting columns 71, a top plate 72 and a bottom plate 73, the top plate 72 is fixedly mounted on the 4 supporting columns 71, and the 4 supporting columns 71 are fixedly mounted on the bottom plate 73.

The invention relates to a second embodiment of a precise cutting device for a teflon tube:

as shown in fig. 8 and 9, the second embodiment is substantially the same as the first embodiment, except that the clamping mechanism 4 is different, the clamping mechanism 4 of the second embodiment includes a main clamping block 44, a plurality of auxiliary clamping blocks 45 are arranged on the front surface of the main clamping block 44, circular arc-shaped grooves 431 for clamping the teflon tubes 8 are arranged on the front surfaces of the main clamping block 44 and the auxiliary clamping blocks 45, notches 432 for cutting are arranged on the side surfaces of the main clamping block 44, the auxiliary clamping blocks 45 and the notches 432 are designed according to the length of the cut teflon tubes 8, the number of the auxiliary clamping blocks 45 and the notches 432 can be uniformly designed, and the second embodiment of the invention is designed to be 12; the main clamping block 44 is fixedly mounted on the base 1 by a main clamping mounting block 46.

The invention also comprises a control system which is used for controlling the work of the conveying motor 31, the finger air cylinder 41, the cutting motor 52 and the linear motor 61.

As shown in fig. 10, the invention also provides a precision cutting method of a teflon tube, which comprises the following steps:

A. inserting: the head of a Teflon pipe 8 penetrates through the cooling water tank 2 and is inserted into the conveying mechanism 3;

B. conveying and clamping: the conveying mechanism 3 conveys the Teflon tube 8 with fixed length into the clamping mechanism 4 and clamps the Teflon tube;

C. rotating: the cutting mechanism 5 works and rotates;

D. cutting and returning: the cutting driving mechanism 6 works to drive the cutting mechanism 5 to move forwards until the clamping mechanism 4 cuts off the Teflon tube 8 and returns;

E. loosening: the clamping mechanism 4 works to loosen the clamped Teflon pipe 8;

F. and (5) conveying and ejecting: the conveying mechanism 3 works again to convey the Teflon tubes 8 with fixed lengths into the clamping mechanism 4, and meanwhile, the Teflon tubes 8 conveyed upwards push the cut Teflon tubes 8 upwards;

G. and (3) re-clamping: the clamping mechanism 4 works to clamp the Teflon pipe 8;

and D, returning to the step D, and repeating the cutting.

Specifically, step a. interspersing: the head of the teflon tube 8 is inserted between the second belt 3306 and the third belt 343 through the cooling water tank 2 and clamped.

Specifically, step B includes the following substeps:

B1. the conveying motor 31 drives the second belt 3306 to rotate through belt transmission;

B2. the second belt 3306 drives the third belt 343 to convey the fixed-length teflon pipe 8 upward together through the teflon pipe 8 into the two clamping plates 43;

B3. the finger cylinder 41 works to drive the two clamping plates 43 to clamp the Teflon pipe 8.

Specifically, step c. rotate: the cutting motor 52 drives the rotating shaft 57 to rotate through belt transmission, and the rotating shaft 57 drives the cutting blade 59 to rotate together.

Specifically, step D includes the following substeps:

D1. the linear motor 61 drives the rotating cutting blade 59 to move forwards through the slide block guide rail to the notch 432 to cut off the Teflon tube 8;

D2. after cutting, the linear motor 61 carries the rotating cutting blade 59 to return.

Specifically, step e. unclamp: the finger cylinder 41 is operated and returned to drive the two clamping plates 43 to release the Teflon pipe 8.

Specifically, step F includes the following substeps:

F1. the conveying motor 31 works again to drive the second belt 3306 to rotate through belt transmission;

F2. the second belt 3306 drives the third belt 343 to convey the fixed-length teflon pipe 8 upward together through the teflon pipe 8 into the two clamping plates 43;

F3. meanwhile, the cut Teflon tube 8 is pushed upwards by the upward conveyed Teflon tube 8.

Specifically, step g. reclamping: the finger cylinder 41 works again to drive the two clamping plates 43 to clamp the Teflon pipe 8.

The working principle of the precise cutting device for the Teflon tube is as follows: the head of the teflon pipe 8 is inserted between the second belt 3306 and the third belt 343 through the cooling water tank 2 and clamped; the conveying motor 31 rotates to drive the first synchronizing wheel 3301 and the first driving wheel 3304 to rotate simultaneously, the first synchronizing wheel 3301 drives the second synchronizing wheel 3302 to rotate together through the synchronizing belt 3303, the second synchronizing wheel 3302 drives the second driving wheel 3305 to rotate together, so that the first driving wheel 3304 and the second driving wheel 3305 rotate simultaneously to drive 2 second belts 3306 to move upwards simultaneously, the 2 second belts 3306 drive 2 third belts 343 to convey the teflon tubes 8 clamped therein upwards together through friction force to enter the two clamping plates 43, the conveying length is fixed, and the finger cylinder 41 operates to drive the two clamping plates 43 to clamp the teflon tubes 8; the cutting motor 52 works and rotates to drive the first belt pulley 54 to rotate, the first belt pulley 54 drives the second belt pulley 55 to rotate through the first belt 56, and the second belt pulley 55 drives the plurality of cutting blades 59 to rotate together through the rotating shaft 57; when the linear motor 61 works, the backing plate 51 drives the plurality of rotary cutting blades 59 to move forwards along the guide rail 64 to the gap 432 to cut off the Teflon tube 8, and after the cutting is finished, the linear motor 61 works again to drive the rotary cutting blades 59 to return together; the finger cylinder 41 works and returns to drive the two clamping plates 43 to loosen the Teflon pipe 8; the conveying motor 31 works again to rotate and drive the first synchronizing wheel 3301 and the first driving wheel 3304 to rotate simultaneously, the first synchronizing wheel 3301 drives the second synchronizing wheel 3302 to rotate together through the synchronous belt 3303, the second synchronizing wheel 3302 drives the second driving wheel 3305 to rotate together, thereby the first driving wheel 3304 and the second driving wheel 3305 rotate and drive 2 second belts 3306 to move upwards simultaneously, 2 second belts 3306 drive 2 third belts 343 to convey the Teflon tubes 8 clamped therein upwards together through friction force to enter the two clamping plates 43, the conveying length is fixed, meanwhile, the Teflon tubes 8 conveyed upwards eject the cut Teflon tubes 8 upwards, and the finger cylinder 41 works again to drive the two clamping plates 43 to clamp the Teflon tubes 8.

The invention has the advantages that the Teflon tube 8 penetrates through the cooling water tank 2 and is inserted into the conveying mechanism 3, the conveying mechanism 3 conveys the Teflon tube 8 with fixed length into the clamping mechanism 4 and clamps the Teflon tube, and the cutting driving mechanism 6 drives the cutting mechanism 5 to cut off the Teflon tube 8 in the clamping mechanism 4. The invention also provides a precise cutting method of the Teflon tube, which comprises the following steps: A. inserting; B. conveying and clamping; C. rotating; D. cutting and returning; E. loosening; F. then conveying and ejecting; G. then clamping; and D, returning to the step D, and repeating the cutting. The invention can effectively improve the length precision of the cut pipe, has good incision quality, and reduces or even eliminates the bending or flattening condition of the pipe.

Compared with the prior art, the invention has the beneficial effects that:

1. the Teflon tube 8 is clamped by 4 circular belts on the outer circle in four directions to be conveyed upwards, and because the circular belts made of rubber are stressed in the four directions and are soft, the Teflon tube 8 cannot be deformed, bent or flattened, and the clamping mode can reduce or even eliminate the condition that the tube is bent or flattened;

2. the front surfaces of the two clamping plates 43 are provided with the arc-shaped grooves 431, soft materials are arranged in the arc-shaped grooves 431 to clamp the Teflon tubes 8, and the Teflon tubes 8 are stressed in the outer circumferential direction, so that the Teflon tubes 8 can be firmly clamped without deforming, the condition that the tubes are bent or flattened can be eliminated by the clamping mode, and the clamping is reliable and firm;

3. rotatory cutting piece 59 vertical cutting is by the teflon pipe 8 of two grip blocks 43 centre grippings, can not produce horizontal pulling force to teflon pipe 8 when adopting this cutting mode cutting, and the incision that cuts out is level and smooth, and the incision is of high quality.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims

1. A precise cutting method of a Teflon tube is characterized by comprising the following steps:

A. inserting: the head of the Teflon tube (8) passes through the cooling water tank (2) and is inserted into the conveying mechanism (3);

B. conveying and clamping: the conveying mechanism (3) conveys the Teflon tube (8) with fixed length into the clamping mechanism (4) and clamps the Teflon tube;

C. rotating: the cutting mechanism (5) works and rotates;

D. cutting and returning: the cutting driving mechanism (6) works to drive the cutting mechanism (5) to move forwards to the clamping mechanism (4) to cut off the Teflon tube (8) and return;

E. loosening: the clamping mechanism (4) works to loosen the clamped Teflon tube (8);

F. and (5) conveying and ejecting: the conveying mechanism (3) works again to convey the Teflon tubes (8) with fixed lengths into the clamping mechanism (4), and meanwhile, the Teflon tubes (8) conveyed upwards eject the cut Teflon tubes (8) upwards;

G. and (3) re-clamping: the clamping mechanism (4) works to clamp the Teflon tube (8);

returning to the step D, and repeating the cutting;

the step B comprises the following sub-steps:

B1. the conveying motor (31) drives the second belt (3306) to rotate through belt transmission;

B2. the second belt (3306) drives the third belt (343) through the Teflon tube (8) to convey the Teflon tube (8) with fixed length upwards into the two clamping plates (43);

B3. the finger cylinder (41) works to drive the two clamping plates (43) to clamp the Teflon pipe (8);

the step F comprises the following sub-steps:

F1. the conveying motor (31) works again to drive the second belt (3306) to rotate through belt transmission;

F2. the second belt (3306) drives the third belt (343) through the Teflon tube to convey the Teflon tube (8) with fixed length upwards into the two clamping plates (43);

F3. meanwhile, the cut Teflon tubes (8) are ejected upwards by the upward conveyed Teflon tubes (8);

the precise cutting device for the Teflon tube, which is applied to the precise cutting method for the Teflon tube, comprises a base (1), a cooling water tank (2), a conveying mechanism (3), a clamping mechanism (4), a cutting mechanism (5), a cutting driving mechanism (6) and a supporting frame (7), wherein the supporting frame (7) is provided with at least 2 supporting columns (71); the cooling water tank (2), the conveying mechanism (3), the clamping mechanism (4) and the cutting driving mechanism (6) are respectively arranged on the base (1), the cutting mechanism (5) is arranged on the cutting driving mechanism (6), and the base (1) is fixedly arranged on the supporting column (71); the Teflon tube (8) penetrates through the cooling water tank (2) and is inserted into the conveying mechanism (3), the conveying mechanism (3) conveys the Teflon tube (8) with a fixed length into the clamping mechanism (4) and clamps the Teflon tube, and the cutting driving mechanism (6) drives the cutting mechanism (5) to cut off the Teflon tube (8) in the clamping mechanism (4); the conveying mechanism (3) comprises a conveying motor (31), a conveying motor mounting plate (32), a driving wheel pipe conveying assembly (33) and a driven wheel pipe conveying assembly (34), the conveying motor (31) is mounted on the conveying motor mounting plate (32), the conveying motor mounting plate (32) and the driving wheel pipe conveying assembly (33) are respectively mounted on the base (1), the driven wheel pipe conveying assembly (34) is mounted on the driving wheel pipe conveying assembly (33), and an output shaft of the conveying motor (31) is in driving connection with the driving wheel pipe conveying assembly (33); drive wheel send pipe subassembly (33) including first synchronizing wheel (3301), second synchronizing wheel (3302), hold-in range (3303), first drive wheel (3304), second drive wheel (3305), second belt (3306), first round pin axle (3307), second round pin axle (3308), drive wheel installation piece (3309) is installed on base (1), first round pin axle (3307) pass drive wheel installation piece (3309) lower extreme and with delivery motor (31) output shaft fixed connection, second round pin axle (3308) pass drive wheel installation piece (3309) upper end and rotate with it and be connected, first round pin axle (3307) rotate with drive wheel installation piece (3309) and be connected, first synchronizing wheel (3301) are installed in the one end of first round pin axle (3307), the one end in second round pin axle (3308) is installed to second synchronizing wheel (3302), hold-in range (3303) and first synchronizing wheel (3301), The second synchronizing wheels (3302) are in belt transmission connection, the first driving wheel (3304) is mounted at the other end of the first pin shaft (3307), the second driving wheel (3305) is mounted at the other end of the second pin shaft (3308), the second belts (3306) are in belt transmission connection with the first pin shaft (3307) and the second pin shaft (3308), and the number of the second belts (3306) is 2; the driven wheel pipe conveying assembly (34) comprises a first driven wheel (341), a second driven wheel (342), 2 third belts (343) and a driven wheel mounting block (344), wherein the driven wheel mounting block (344) is fixedly mounted on the base (1), the first driven wheel (341) is rotatably mounted at the lower end of the driven wheel mounting block (344), the second driven wheel (342) is rotatably mounted at the upper end of the driven wheel mounting block (344), and the third belts (343) are in driving connection with the first driven wheel (341) and the second driven wheel (342); the distance between action wheel installation piece (3309) and follower installation piece (344) is adjusted, makes the space that encloses between 2 second belts (3306) and 2 third belts (343) just can the elasticity hold down teflon pipe (8), and teflon pipe (8) are held by 4 directions of 2 second belts (3306) and 2 third belts (343) at the excircle.

2. The method for precisely cutting the teflon tube as claimed in claim 1, wherein the step D comprises the following substeps:

D1. the linear motor (61) drives the rotating cutting blade (59) to move forwards through the slide block guide rail to the notch (432) to cut off the Teflon tube (8);

D2. after cutting, the linear motor (61) carries the rotary cutting blade (59) to return together.