CN111451772A

CN111451772A - Needle tubing automatic cutout machine

Info

Publication number: CN111451772A
Application number: CN202010359405.XA
Authority: CN
Inventors: 曹胜德; 黄麒璋
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-05-08
Filing date: 2020-04-30
Publication date: 2020-07-28

Abstract

An automatic needle tube cutting machine comprises a rack, a straightening device, a traction device, a feeding device, a cutting device, a blanking device and a pre-storage disc, wherein the rack is provided with a workbench, a power input main shaft and a transmission mechanism, the feeding device and the cutting device are arranged on the workbench, the power input main shaft drives the transmission mechanism to work, the cutting device comprises a cutter rest, a motor and a rotary cutter head, the motor drives the cutter rest to rotate, the cutter rest is provided with a cutter head swing rod, a pushing inclined block and a cutter head installation groove, the rotary cutter head is arranged on the cutter rest and comprises a pre-cutting cutter head and a chamfering cutter head, the pre-cutting cutter head is a sharp cutter head, the chamfering cutter head is a blunt cutter head with a trapezoidal cutter head cross section, the other ends of the two cutter head seats are matched with the cutter head swing rod, the cutter head comprises a cutter head end, a pushing end and a hinge point, the cutter head, and drives the rotary cutter head to feed in the radial direction of the rotation axis through the cutter head end.

Description

Needle tubing automatic cutout machine

Technical Field

The invention relates to an automatic cutting machine for needle tubes.

Background

The traditional needle tube cutting procedure is that the whole roll of needle tube raw material is straightened and cut into the length of about one meter, then the needle tubes with the length of about one meter are bundled together for fixed-length cutting, but the cutting adopts the abrasive wheel cutting, the length of the thickness of the grinding wheel is lost by cutting in the cutting process, and the tail material of the needle tube with the length less than the fixed length is lost after cutting, for the needle tube with higher raw material price, the losses bring high economic losses, and burrs are generated on the excircle of the end face of the needle tube after the cutting by the grinding wheel, because the needle tube is sleeved with the needle seat when being processed into the needle, the end surface of the needle tube is needed to be ground in order to avoid scratching the inner wall of the needle seat, therefore, the additive mode of firstly cutting into a longer length and then cutting into a fixed length needs more working procedures in the processing process, is not suitable for automatic production and has lower production efficiency.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the needle tube automatic cutting machine is low in cutting loss, suitable for automatic production, simplified in machining process and high in production efficiency.

In order to solve the technical problems, the invention adopts the following technical scheme: an automatic needle tube cutting machine comprises a machine frame, a straightening device, a traction device, a feeding device, a cutting device, a blanking device and a pre-storage disc, wherein a workbench, a power input main shaft and a transmission mechanism are arranged on the machine frame, the feeding device and the cutting device are arranged on the workbench, the power input main shaft drives the transmission mechanism to work, the transmission mechanism comprises a feeding transmission device, a cutting transmission device and a blanking transmission device which work synchronously, the feeding transmission device, the cutting transmission device and the blanking transmission device respectively drive the feeding device, the cutting device comprises a knife rest, a motor and a rotary knife head, the motor drives the knife rest to rotate, a knife head swing rod, a propelling inclined block and a knife head mounting groove are arranged on the knife rest, the rotary knife head comprises a pre-cutting knife head and a chamfering knife head, the pre-cutting knife head and the chamfering knife head are respectively mounted in the knife head mounting groove in a vertical relative position through a knife head base, the pre-cutting tool bit is sharp tool bit, and the chamfer tool bit is trapezoidal blunt tool bit for the tool bit cross-section, two tool bit seat one end cooperate with pre-cutting tool bit and chamfer tool bit respectively, and the other end and the tool bit pendulum rod of two tool bit seats cooperate, the tool bit pendulum rod includes tool bit end, propulsion end and pin joint, tool bit end and rotatory tool bit cooperation, the propulsion end cooperatees with the propulsion sloping block, the cutting transmission drives and impels the sloping block carry, impel the sloping block to promote the propulsion end and make the tool bit pendulum rod rotate around the pin joint to drive the radial direction feed of rotatory tool bit edge rotation axis through the tool bit end.

The invention has the beneficial effects that: the disc-shaped needle tube raw material is pulled by a traction device to be straightened by a straightening device, the disc-shaped needle tube raw material is prestored in a prestored disc to conveniently adjust the balance of feeding speed and straightening speed, the disc-shaped needle tube raw material is fed to a cutting device in a fixed length mode by the feeding device, the cutting device adopts a motor to drive a cutter frame to rotate so as to drive a rotary cutter head to rotate, the rotary cutter head is driven to feed along the radial direction of a rotation axis to the surface of the excircle of the needle tube under the action of a cutter head swing rod, the excircle of the needle tube is simultaneously pre-cut and chamfered by arranging a pre-cutting cutter head and a chamfering cutter head which are arranged at opposite positions from top to bottom, the feed distance of the rotary cutter head is controlled by matching a propelling inclined block and a propelling end, the feed distance of the rotary cutter head is controlled, the pre-cutting cutter head is controlled to be a sharp-pointed cutter head and the chamfering cutter head of a, the needle tube is pre-cut and chamfered, only a small part of wall thickness is left, and a processing groove formed by pre-cutting and chamfering is reserved, the needle tube can be directly broken and blanked by a needle tube winding and folding blanking device of a 201520455220.3 needle tube automatic splitting machine in the next procedure by utilizing the characteristics of metal materials, no cutting loss exists in the whole process, the outer circle of the end face of the needle tube subjected to broken and blanked is chamfered, continuous and uninterrupted processing can be realized, and the needle tube chamfering machine is suitable for automatic production.

Furthermore, the chamfering tool bit is a circular tool bit, is fixed on the tool bit seat through a fixed shaft and is matched with the tool bit seat in a rolling manner, a needle tube positioning piece is further arranged on the tool bit seat where the chamfering tool bit is located, the needle tube positioning piece is formed by two positioning pieces which are used for clamping a needle tube on the left side and the right side, the two positioning pieces are arranged on the end surface of the tool bit seat close to one side of the tool bit seat where the pre-cutting tool bit is located, an adjusting groove is formed in each positioning piece, a fastening screw is arranged on each adjusting groove and fixes the positioning pieces on the tool bit seat, the chamfering tool bit is set to be a circular tool bit which can reduce friction and abrasion in processing, meanwhile, the needle tube positioning pieces are respectively arranged on the end surfaces of the tool bit seat through the two positioning pieces, the needle tube is clamped from the left, and the positioning block can be adjusted and compensated forwards after being worn.

Further, between the tool bit end of tool bit pendulum rod and the precutting tool bit to and the tool bit end of tool bit pendulum rod and the chamfer tool bit all are equipped with adjusting screw, adjusting screw adjusts precutting tool bit and the initial position of chamfer tool bit along the radial direction of knife rest rotation axis, and under the fixed prerequisite of the feed stroke that impels the sloping block to impel and bring, can adjust the final position of feed through adjusting screw, can conveniently adjust the required precutting of needle tubing of different materials, different pipe diameters and the radial degree of depth of chamfer, make ready for next rupture unloading process.

Furthermore, the workbench is provided with a transverse guide strip and a longitudinal guide strip, the feeding device comprises a pressing mechanism and a feeding mechanism, the pressing mechanism comprises a pressing table, a lifting table, a first lifting inclined block and a pressing rod, the feeding mechanism comprises a feeding table and a pressing plate, the first lifting inclined block is fixedly arranged on the pressing table, the lifting table is fixed on the workbench through a spring piece, the spring piece provides downward elastic force for the lifting table, the lifting table extends along the longitudinal direction, the lifting table is matched with the upper surface of the first lifting inclined block and can lift up and down along with the left and right movement of the first lifting inclined block, the cutting device further comprises a pressing cutting mechanism, the pressing cutting mechanism is arranged on the pressing table, the pressing cutting mechanism comprises two pressing blocks, two pressing rods, a connecting rod and a second lifting inclined block, and the second lifting inclined block is fixedly arranged on the pressing table, the two compression blocks are respectively matched with corresponding compression rods, the middle part of the connecting rod is hinged and fixed on the workbench, one end of the connecting rod is fixedly connected with the two compression rods, the lower surface of the other end of the connecting rod is matched with the upper surface of the second lifting inclined block and can be lifted up and down along with the left-right movement of the second lifting inclined block, the first lifting inclined block and the second lifting inclined block sequentially comprise a high plane section, an inclined plane section and a low plane section from high to low, the direction of the first lifting inclined block from high to low is opposite to the direction of the second lifting inclined block from high to low, the middle part of the compression rod is hinged and fixed on the feeding table, the lower surface of one end of the compression rod is abutted with the lifting table, the lower surface of the other end of the compression rod is abutted with the compression plate, the compression plate is fixed on the feeding table, elastic open compression seams are respectively arranged on the compression plate and the compression blocks, the horizontal guide groove is matched with the horizontal guide strip, a longitudinal guide groove is arranged below the feeding table and matched with the longitudinal guide strip, the feeding transmission comprises a horizontal transmission connecting rod and a longitudinal transmission connecting rod, the horizontal transmission connecting rod drives the pressing table to do horizontal reciprocating motion, and the longitudinal transmission connecting rod drives the feeding table to do longitudinal reciprocating motion.

The beneficial effect of the above improvement is: the power input spindle transmits the power of a motor through a transmission mechanism and simultaneously realizes the transverse reciprocating motion of the pressing mechanism, the longitudinal reciprocating motion of the feeding mechanism and the transverse reciprocating motion of the pressing cutting mechanism, in the process of the transverse reciprocating motion of the pressing mechanism and the pressing cutting mechanism, the pressing table enables the transverse reciprocating motion to be more stable and reliable under the matching action of the transverse guide groove and the transverse guide strip, because the first lifting inclined block and the second lifting inclined block respectively comprise a high plane section, an inclined plane section and a low plane section, the direction from high to low of the first lifting inclined block is opposite to the direction from high to low of the second lifting inclined block, the vertical motion of the lifting table and the pressing rod is realized through the matching of the first lifting inclined block and the lifting table and the matching of the second inclined block and the connecting rod, in the matching process of the lifting table and the high plane section of the first lifting inclined block, the connecting rod is matched with the low plane of the second lifting inclined block, the lifting platform is always in a raised state, one end of the compression rod matched with the lifting platform is raised at the moment, the compression rod is hinged and fixed on the feeding platform by the middle part, the other end of the compression rod matched with the compression plate is pressed, the compression plate is in a compression state, two compression blocks of the compression cutting mechanism are in a release state under the action of an elastically-opened compression crack, the longitudinal reciprocating motion of the feeding mechanism is combined to complete the feeding process, the compression platform continues to move leftwards and rightwards at the moment to drive the first lifting inclined block and the second lifting inclined block to move, when the lifting platform moves to a position opposite to a low plane section of the first lifting inclined block, the compression plate is pressed to be matched with a low plane section of the lifting inclined block under the action of downward elastic force of the spring piece, the connecting rod moves leftwards and rightwards to a position opposite to a high plane section of the second lifting inclined block to be lifted, and the compression, and two pressing blocks pressing the cutting mechanism are in a pressing state, the feeding mechanism returns and cutting processing is carried out simultaneously, when the returning of the feeding mechanism is finished, the cutting processing is also finished, the pressing table moves to a station starting feeding at the moment, and the whole process is stable in operation, high in efficiency and reliable in performance

Further, it comprises the outer location fender that the preliminary deposit dish was kept off with annular distribution by the interior location of both sides splint, annular distribution, interior location is kept off and is equipped with interior sensor, outer location is kept off and is equipped with outer sensor, interior location keep off and outer location keep off and both sides splint form an annular space, and the needle tubing raw materials prestores in the annular space after the round in the annular space.

The beneficial effect of the above improvement is: the needle tube raw material is straightened by the straightening device and carried to the next process by the traction device, in the process, the straightened needle tube is pre-stored in an annular space formed by the inner positioning baffle, the outer positioning baffle and the two side clamping plates after being wound for one circle due to the elastic performance of the metal material as long as the straightened needle tube is not bent greatly, the needle tube still keeps in the straightening state, when the diameter of the circle wound by the needle tube in the annular space is close to the circumferential diameter of the outer positioning baffle, the needle tube can touch an outer sensor on the outer positioning baffle to trigger a signal that the pre-storage amount reaches the maximum, the subsequent process is slow in carrying, the traction device is carried too fast, at the moment, the traction motor is decelerated through the information control of a single chip microcomputer, and when the diameter of the circle wound by the needle tube is close to the circumferential diameter of the inner positioning baffle, the needle tube can touch an inner sensor on the inner positioning baffle, the signal that the triggering pre-storage has reached the minimum shows that the carry of the subsequent process is fast, the carry of the traction device is too slow, and the traction motor is accelerated by the information control of the single chip microcomputer at the moment, so that the subsequent process is not influenced.

Further, a leakage detection device is arranged between the pre-storage disc and the feeding device and is fixed on the workbench through a mounting support, the leakage detection device comprises a main body, an air inlet, an air outlet and two end sealing ports, the main body is a hollow tube structure and is sleeved on the excircle of the needle tube, the air inlet and the air outlet are both arranged on the main body, the air inlet is externally connected with a pressure air source to provide air pressure in the main body, the air outlet is provided with an ejector pin, the two end sealing ports are in sealing fit with the excircle of the needle tube to form a closed pressure space formed by the two end sealing ports, the excircle of the needle tube and the inner cavity of the main body, the two end sealing ports comprise a sealing rubber tube sleeve and a sealing pressing knob, the sealing rubber tube sleeve is sleeved on the excircle surface of the needle tube, the sealing pressing knob provides sealing pressing force between the sealing rubber tube, so as to maintain the high pressure in the pressure space, and when the pressure in the pressure space leaks, the thimble moves downwards under the action of gravity and is separated from the sealing fit with the exhaust port.

The beneficial effect of the above improvement is: before the needle tube raw material is not cut, the needle tube passes through the two end sealing ports of the main body of the leakage detection device, so that the excircle of the needle tube in the main body and the inner cavity of the main body form a closed annular tubular space under the action of the two end sealing ports, then air pressure is provided for the main body through an air inlet and an external pressure air source, so that the annular tubular space can be kept in a high pressure state, the thimble at the exhaust port props against and seals the exhaust port from inside to outside, only when the surface of the needle tube has a leak hole, the air leaks into the inner cavity of the needle tube from the excircle surface of the needle tube through the leak hole, the annular tubular space cannot be kept in a high pressure state, the thimble moves downwards under the action of gravity and is separated from the sealing fit with the exhaust port, so that the leak hole on the surface of the needle tube can be timely and effectively detected, and the sealing rubber, meanwhile, when the needle tube moves relative to the leakage detection device to the next process, the outer surface of the needle tube cannot be abraded, and the needle tubes with different tube diameters can achieve the sealing effect only by adjusting the tightness of the sealing compression knob.

Drawings

Fig. 1 is a schematic structural diagram of an automatic needle tube cutting machine provided by the invention.

Fig. 2 is a schematic view of the cutting apparatus of fig. 1.

Fig. 3 is an exploded schematic view of fig. 2.

Fig. 4 is an exploded view from another angle of fig. 3.

Fig. 5 is a schematic view of fig. 2 with the tool holder removed.

FIG. 6 is a schematic view of the needle cannula after pre-cutting and chamfering.

FIG. 7 is a schematic view of the needle cannula in cooperation with the pre-cutting bit and the chamfering bit and the two locating blocks.

Fig. 8 is a schematic structural view of the table of fig. 1.

Fig. 9 is another angular schematic of fig. 8.

Fig. 10 is an enlarged schematic view at a in fig. 8.

Fig. 11 is a schematic view of the structure of the leak detector.

Fig. 12 is a schematic diagram of the structure of a pre-stored disk.

Fig. 13 is a schematic view of the structure of fig. 12 with one side clamping plate removed.

Detailed Description

In order to realize the technical means, novel features and functions of the present invention, the present invention will be further described below.

As shown in the figure, a needle tubing automatic cutout machine, include frame 20, alignment device 19, draw gear 13, material feeding unit 4, cutting device 5, unloader 6 and prestore dish 7, be equipped with workstation 1, power input main shaft 2, drive mechanism 3 on the frame 20, material feeding unit 4 and cutting device 5 set up on workstation 1, power input main shaft 2 drives drive mechanism 3 work, drive mechanism 3 includes synchronous work's pay-off transmission 31, cutting transmission 32 and unloading transmission 33, pay-off transmission 31, cutting transmission 32 and unloading transmission 33 drive material feeding unit 4, cutting device 5 and unloader 6 work respectively, cutting device 5 includes knife rest 51, motor 52 and rotatory tool bit 53, motor 52 drives knife rest 51 and rotates, be equipped with tool bit pendulum rod 54, impel the mounting groove 55 and tool bit 56 on the knife rest 51, the rotary cutter head 53 is mounted on the cutter frame 51, the rotary cutter head 53 comprises a pre-cutting cutter head 53-1 and a chamfering cutter head 53-2, the pre-cutting cutter head 53-1 and the chamfering cutter head 53-2 are respectively mounted in the cutter head mounting groove 56 in a vertically opposite position through a cutter head seat 59, the pre-cutting cutter head 53-1 is a sharp cutter head, the chamfering cutter head 53-2 is a blunt cutter head with a trapezoidal cutter head section, one end of each of the two cutter head seats 59 is respectively matched with the pre-cutting cutter head 53-1 and the chamfering cutter head 53-2, the other end of each of the two cutter head seats 59 is matched with a cutter head swing rod 54, the cutter head swing rod 54 comprises a cutter head end 54-1, a pushing end 54-2 and a hinge point 54-3, the cutter head end 54-1 is matched with the rotary cutter head 53, and the pushing end 4, the cutting transmission 32 drives the pushing inclined block 55 to carry, and the pushing inclined block 55 pushes the pushing end 54-2 to make the cutter head swing rod 54 rotate around the hinge point 54-3, and drives the rotary cutter head 53 to feed along the radial direction of the rotation axis through the cutter head end 54-1.

The chamfering tool bit 53-2 is a circular hobbing tool bit and is fixed on the tool bit seat 59 through a fixing shaft and is matched with the tool bit seat 59 in a rolling manner, a needle tube positioning piece is further arranged on the tool bit seat 59 where the chamfering tool bit 53-2 is located, the needle tube positioning piece is two positioning pieces 53-3 which are used for clamping a needle tube on the left side and the right side, the two positioning pieces 53-3 are arranged on the end face of the tool bit seat 59 close to one side of the tool bit seat 59 where the pre-cutting tool bit 53-1 is located, an adjusting groove 11 is formed in each positioning piece 53-3, a fastening screw 12 is arranged on each adjusting groove 11, and each positioning piece 53-3 is.

Adjusting screws 58 are arranged between the cutter head end 54-1 of the cutter head swing rod 54 and the precutting cutter head 53-1, and between the cutter head end 54-1 of the cutter head swing rod 54 and the chamfering cutter head 53-2, and the adjusting screws 58 adjust the initial positions of the precutting cutter head 53-1 and the chamfering cutter head 53-2 along the radial direction of the rotation axis of the cutter holder 51.

The automatic feeding device is characterized in that a transverse guide strip 1-1 and a longitudinal guide strip 1-2 are arranged on the workbench 1, the feeding device 4 comprises a pressing mechanism 4-1 and a feeding mechanism 4-2, the pressing mechanism 4-1 comprises a pressing table 4-11, an elevating table 4-12, a first elevating inclined block 4-13 and a pressing rod 4-14, the feeding mechanism 4-2 comprises a feeding table 4-21 and a pressing plate 4-22, the first elevating inclined block 4-13 is fixedly arranged on the pressing table 4-11, the elevating table 4-12 is fixed on the workbench 1 through a spring piece 10, the spring piece 10 provides downward elastic force for the elevating table 4-12, the elevating table 4-12 extends along the longitudinal direction, the elevating table 4-12 is matched with the upper surface of the first elevating inclined block 4-13, the cutting device 5 also comprises a pressing cutting mechanism which is arranged on a pressing table 4-11 and comprises two pressing blocks 5-1, two pressing rods 5-2, a connecting rod 5-3 and a second lifting inclined block 5-4, the second lifting inclined block 5-4 is fixedly arranged on the pressing table 4-11, the two pressing blocks 5-1 are respectively matched with the corresponding pressing rods 5-2, the middle part of the connecting rod 5-3 is hinged and fixed on the working table 1, one end of the connecting rod 5-3 is fixedly connected with the two pressing rods 5-2, the lower surface of the other end of the connecting rod 5-3 is matched with the upper surface of the second lifting inclined block 5-4 and is lifted up and down along with the left-right movement of the second lifting inclined block 5-4, the first lifting inclined block 4-13 and the second lifting inclined block 5-4 sequentially comprise a high plane section 14, an inclined plane section 15 and a low plane section 16 from high to low, the direction from high to low of the first lifting inclined block 4-13 is opposite to the direction from high to low of the second lifting inclined block 5-4, the middle part of the compression bar 4-14 is hinged and fixed on a feeding table 4-21, the lower surface of one end of the compression bar 4-14 is abutted with the lifting table 4-12, the lower surface of the other end of the compression bar 4-14 is abutted with the compression plate 4-22, the compression plate 4-22 is fixed on the feeding table 4-21, the compression plate 4-22 and the compression block 5-1 are respectively provided with an elastically opened compression crack 13, a transverse guide groove 17 is arranged below the compression table 4-11, the transverse guide groove 17 is matched with a transverse guide strip 1-1, a longitudinal guide groove 18 is arranged below the feeding table 4-21, the longitudinal guide groove 18 is matched with the longitudinal guide strip 1-2, the feeding transmission 31 comprises a transverse transmission connecting rod 3-1 and a longitudinal transmission connecting rod 3-2, the transverse transmission connecting rod 3-1 drives the pressing table 4-11 to do transverse reciprocating motion, and the longitudinal transmission connecting rod 3-2 drives the feeding table 4-21 to do longitudinal reciprocating motion.

The pre-storage disk 7 is composed of two side clamping plates 78, inner positioning blocks 79 distributed in an annular mode and outer positioning blocks 70 distributed in an annular mode, an inner sensor 76 is arranged on each inner positioning block 79, an outer sensor 77 is arranged on each outer positioning block 70, an annular space 71 is formed by each inner positioning block 79, each outer positioning block 70 and the two side clamping plates 78, needle tube raw materials are pre-stored in the annular space 71 after being wound for one circle in the annular space 71,

a leakage detection device 8 is further arranged between the pre-storage disc 7 and the feeding device 4, the leakage detection device 8 is fixed on the workbench 1 through a mounting support 81, the leakage detection device 8 comprises a main body 83, an air inlet 84, an air outlet 85 and two end sealing ports 86, the main body 83 is in a hollow tube structure and is sleeved on the excircle of the needle tube, the air inlet 84 and the air outlet 85 are both arranged on the main body 83, the air inlet 84 is externally connected with a pressure air source to provide air pressure in the main body 83, an ejector pin 87 is arranged on the air outlet 85, the two end sealing ports 86 are in sealing fit with the excircle of the needle tube to form a closed pressure space formed by the two end sealing ports 86, the excircle of the needle tube and the inner cavity of the main body 83, the two end sealing ports 86 comprise a sealing rubber tube sleeve 88 and a sealing pressing knob 89, the sealing rubber tube 88 is sleeved on the excircle surface, and, the thimble 87 seals the exhaust port 85 when the pressure in the plenum is at a high pressure to maintain the high pressure in the plenum, and when the pressure in the plenum leaks, the thimble 87 moves downward under the force of gravity and out of sealing engagement with the exhaust port 85.

The above description is provided as a preferred embodiment of the present invention, and should not be construed as limiting the scope of the present invention, as products made by the present technology are within the scope of the present invention.

Claims

1. The utility model provides a needle tubing automatic cutout machine, includes frame (20), aligning device (19), draw gear (13), material feeding unit (4), cutting device (5), unloader (6) and prestores dish (7), be equipped with workstation (1), power input main shaft (2), drive mechanism (3) on frame (20), material feeding unit (4) and cutting device (5) set up on workstation (1), power input main shaft (2) drive mechanism (3) work, its characterized in that: the cutting device is characterized in that the transmission mechanism (3) comprises a feeding transmission (31), a cutting transmission (32) and a blanking transmission (33) which work synchronously, the feeding transmission (31), the cutting transmission (32) and the blanking transmission (33) respectively drive the feeding device (4), the cutting device (5) and the blanking device (6) to work, the cutting device (5) comprises a cutter rest (51), a motor (52) and a rotary cutter head (53), the motor (52) drives the cutter rest (51) to rotate, a cutter head swing rod (54), a pushing inclined block (55) and a cutter head installation groove (56) are arranged on the cutter rest (51), the rotary cutter head (53) is installed on the cutter rest (51) and comprises a pre-cutting cutter head (53-1) and a chamfering cutter head (53-2), the pre-cutting cutter head (53-1) and the chamfering cutter head (53-2) are installed in the cutter head installation groove (56) in an up-down relative position through a cutter head seat (59) respectively, the pre-cutting tool bit (53-1) is a sharp pointed tool bit, the chamfering tool bit (53-2) is a blunt tool bit with a trapezoidal tool bit section, one end of each of the two tool bit seats (59) is respectively matched with the pre-cutting tool bit (53-1) and the chamfering tool bit (53-2), the other end of each of the two tool bit seats (59) is matched with the tool bit swing rod (54), each tool bit swing rod (54) comprises a tool bit end (54-1), a pushing end (54-2) and a hinge point (54-3), the tool bit ends (54-1) are matched with the rotating tool bit (53), the pushing ends (4-2) are matched with the pushing inclined blocks (55), the cutting transmission (32) drives the pushing inclined blocks (55) to move, the pushing inclined blocks (55) push the pushing ends (54-2) to enable the tool bit swing rods (54) to rotate around the hinge points (54-3), and the rotary cutter head (53) is driven by the cutter head end (54-1) to feed along the radial direction of the rotation axis.

2. The automatic needle tube cutting machine according to claim 1, wherein: the chamfering tool bit (53-2) is a circular hobbing tool bit and is fixed on the tool bit seat (59) through a fixing shaft and matched with the tool bit seat (59) in a rolling manner, a needle tube positioning piece is further arranged on the tool bit seat (59) where the chamfering tool bit (53-2) is located, the needle tube positioning piece is used for clamping a needle tube by the left side and the right side of two positioning blocks (53-3), the two positioning blocks (53-3) are arranged on the end face, close to one side of the tool bit seat (59) where the precutting tool bit (53-1) is located, of the tool bit seat (59), an adjusting groove (11) is formed in each positioning block (53-3), a fastening screw (12) is arranged on each adjusting groove (11), and the positioning blocks (53-3) are fixed on the tool bit seat.

3. The automatic needle tube cutting machine according to claim 2, wherein: adjusting screws (58) are arranged between the tool bit end (54-1) of the tool bit swing rod (54) and the precutting tool bit (53-1), and between the tool bit end (54-1) of the tool bit swing rod (54) and the chamfering tool bit (53-2), and the adjusting screws (58) adjust the initial positions of the precutting tool bit (53-1) and the chamfering tool bit (53-2) along the radial direction of the rotation axis of the tool rest (51).

4. The automatic needle tube cutting machine according to claim 1, wherein: the automatic feeding device is characterized in that the workbench (1) is provided with a transverse guide strip (1-1) and a longitudinal guide strip (1-2), the feeding device (4) comprises a pressing mechanism (4-1) and a feeding mechanism (4-2), the pressing mechanism (4-1) comprises a pressing table (4-11), a lifting table (4-12), a first inclined lifting block (4-13) and a pressing rod (4-14), the feeding mechanism (4-2) comprises a feeding table (4-21) and a pressing plate (4-22), the first inclined lifting block (4-13) is fixedly arranged on the pressing table (4-11), the lifting table (4-12) is fixed on the workbench (1) through a spring piece (10), and the spring piece (10) provides downward elastic force for the lifting table (4-12), the cutting device comprises a lifting table (4-12), a cutting device (5) and a pressing and cutting mechanism, wherein the lifting table (4-12) extends along the longitudinal direction, the lifting table (4-12) is matched with the upper surface of a first lifting inclined block (4-13) and moves up and down along with the left and right movement of the first lifting inclined block (4-13), the cutting device (5) further comprises a pressing and cutting mechanism, the pressing and cutting mechanism is arranged on a pressing table (4-11), the pressing and cutting mechanism comprises two pressing blocks (5-1), two pressing rods (5-2), a connecting rod (5-3) and a second lifting inclined block (5-4), the second lifting inclined block (5-4) is fixedly arranged on the pressing table (4-11), the two pressing blocks (5-1) are respectively matched with the corresponding pressing rods (5-2), and the middle part of the connecting rod (5-3) is hinged and fixed on a workbench (1), one end of a connecting rod (5-3) is fixedly connected with two pressing rods (5-2), the lower surface of the other end of the connecting rod (5-3) is matched with the upper surface of a second lifting inclined block (5-4) and ascends and descends along with the left-right movement of the second lifting inclined block (5-4), the first lifting inclined block (4-13) and the second lifting inclined block (5-4) sequentially comprise a high plane section (14), an inclined plane section (15) and a low plane section (16) from high to low, the direction from high to low of the first lifting inclined block (4-13) is opposite to the direction from high to low of the second lifting inclined block (5-4), the middle part of the pressing rod (4-14) is hinged and fixed on a feeding table (4-21), the lower surface of one end of the pressing rod (4-14) is abutted to the lifting table (4-12), the lower surface of the other end of the compression rod (4-14) is abutted against a compression plate (4-22), the compression plate (4-22) is fixed on a feeding table (4-21), the compression plate (4-22) and a compression block (5-1) are respectively provided with an elastically opened compression crack (13), a transverse guide groove (17) is arranged below the compression table (4-11), the transverse guide groove (17) is matched with a transverse guide strip (1-1), a longitudinal guide groove (18) is arranged below the feeding table (4-21), the longitudinal guide groove (18) is matched with a longitudinal guide strip (1-2), the feeding transmission (31) comprises a transverse transmission connecting rod (3-1) and a longitudinal transmission connecting rod (3-2), and the transverse transmission connecting rod (3-1) drives the compression table (4-11) to transversely reciprocate, the longitudinal transmission connecting rod (3-2) drives the feeding table (4-21) to reciprocate longitudinally.

5. The automatic needle tube cutting machine according to claim 1, wherein: prestore dish (7) by both sides splint (78), the interior location of annular distribution keep off (79) and the outer location that the annular distributes keep off (70) and constitute, interior location is equipped with interior sensor (76) on keeping off (79), outer location is equipped with outer sensor (77) on keeping off (70), interior location keeps off (79) and outer location keep off (70) and both sides splint (78) form an annular space (71), and the needle tubing raw materials prestores in annular space (71) around the round after in annular space (71).

6. The automatic needle tube cutting machine according to claim 1, wherein: a leakage detection device (8) is further arranged between the pre-storage disc (7) and the feeding device (4), the leakage detection device (8) is fixed on the workbench (1) through a mounting support (81), the leakage detection device (8) comprises a main body (83), an air inlet (84), an air outlet (85) and two end sealing ports (86), the main body (83) is in a hollow tube structure sleeved on the excircle of the needle tube, the air inlet (84) and the air outlet (85) are both arranged on the main body (83), an external pressure air source of the air inlet (84) provides air pressure in the main body (83), a thimble (87) is arranged on the air outlet (85), the two end sealing ports (86) are in sealing fit with the excircle of the needle tube to form a closed pressure space by the two end sealing ports (86), the excircle of the needle tube and the inner cavity of the main body (83), and the two end sealing ports (86) comprise a sealing rubber tube sleeve (88) and a sealing, the sealing rubber tube (88) is sleeved on the outer circular surface of the needle tube, the sealing pressing knob (89) provides sealing pressing force between the sealing rubber tube (88) sleeve and the needle tube, the ejector pin (87) seals the exhaust port (85) when the pressure space is in high pressure so as to keep the high pressure in the pressure space, and when the pressure in the pressure space leaks, the ejector pin (87) moves downwards under the action of gravity and is separated from sealing fit with the exhaust port (85).