CN215033978U

CN215033978U - Rod cutting machine

Info

Publication number: CN215033978U
Application number: CN202120169903.8U
Authority: CN
Inventors: 林达云
Original assignee: Yuhuan Jiusheng Copper Co ltd
Current assignee: Yuhuan Jiusheng Copper Co ltd
Priority date: 2021-01-21
Filing date: 2021-01-21
Publication date: 2021-12-07
Anticipated expiration: 2031-01-21

Abstract

The utility model provides a rod cutting machine, it includes frame, cutting knife, be provided with in the frame and be used for ordering about the gyro wheel material feeding unit of rod intermittent type nature removal and be used for ordering about the cutting knife is reciprocating curve's cutting motion's drive arrangement, still be provided with in the frame and be used for pressing from both sides and put the last silo and the pneumatic loading attachment that are used for installing the rod side by side are arranged in the clamping device, the relative horizontal plane slope of the rod that gyro wheel material feeding unit carried and are used for, gyro wheel material feeding unit has and supplies the rod to wear to establish and the wide adjustable transport clearance in clearance, pneumatic loading attachment is used for ordering about go up the rod of silo lower extreme and carry clearance motion. The utility model discloses a silo in the cooperation of pneumatic loading attachment realizes the mechanized material loading operation of member to assist and carry out the centre gripping with clamping device to the member on the gyro wheel material feeding unit in cutting process, in order to avoid member material loading operation and cutting operation to be mutual interference, thereby improved the work efficiency of cutting machine.

Description

Rod cutting machine

Technical Field

The utility model belongs to the technical field of the technique of cutting machine and specifically relates to a member cutting machine is related to.

Background

The rod is a machined part frequently used in machining, the length of a raw material of the rod is large, and the rod needs to be cut into short rods so as to facilitate the continuous machining of the next procedure. At present, a cutting machine is generally used for cutting the rod.

Chinese patent No. CN210731208U discloses a rod cutting machine, which comprises a frame, wherein one end of the frame is rotatably provided with a connecting plate, the connecting plate is provided with a cutting device for cutting a rod, the frame is provided with a driving device for driving one end of the connecting plate to rotate in a reciprocating manner, so as to drive the cutting device to perform a cutting motion of a reciprocating curve, and the other end of the frame is provided with an automatic feeding device for driving the rod to move intermittently; the automatic feeding device comprises at least two driving rollers rotatably arranged on the rack, a guide rod vertically arranged on the rack and a sliding block sleeved on the guide rod, and the sliding block is rotatably provided with pressing rollers which are positioned above the driving rollers and have the same number with the driving rollers; the upper end level of guide bar is provided with the diaphragm that extends to one side, the one end that the guide bar was kept away from to the diaphragm rotates and is connected with the U type handle of cover in the guide bar both sides, the both sides of sliding block are rotated and are provided with the riser that upwards extends, two the one end that the riser upwards extends rotates with the both sides that U type handle is close to the guide bar and is connected.

The cutting machine drives the pressing rollers to move synchronously through manually controlling the U-shaped handle, so that the change of the gap width of the conveying gap between the pressing rollers and the driving rollers is realized, the rod piece is installed in the conveying gap, and intermittent feeding is carried out. However, the above prior art solutions have the following drawbacks: 1) when the cutting machine cuts the rod piece, the rod piece needs to be pressed by the pressing roller, so that the feeding operation and the cutting operation of the rod piece are mutually interfered, and the cutting efficiency is not improved; 2) the feeding operation of the rod piece needs to be finished manually, is greatly influenced by the manual technical level, can increase the feeding time of the rod piece, influences the cutting efficiency, and needs to be improved.

SUMMERY OF THE UTILITY MODEL

To the not enough that exists among the prior art, the utility model provides a rod cutting machine, it has solved the problem of how to improve cutting efficiency who exists among the prior art.

According to the utility model discloses an embodiment, a rod cutting machine, it includes frame, cutting knife, be provided with in the frame and be used for ordering about the gyro wheel material feeding unit of rod intermittent type nature removal with be used for ordering about the cutting knife is reciprocating curved cutting motion's drive arrangement, still be provided with in the frame and be used for pressing from both sides and put clamping device, the relative horizontal plane slope of the rod that gyro wheel material feeding unit carried are arranged and are used for installing the last silo and the pneumatic loading attachment of rod side by side, gyro wheel material feeding unit has and supplies the rod to wear to establish and the wide adjustable transport clearance in clearance, pneumatic loading attachment is used for ordering about the rod of going up the silo lower extreme is carried the clearance motion towards.

By adopting the technical scheme, in the actual cutting process, a plurality of rod pieces are arranged on the feeding trough in parallel in advance, and the rod pieces can move towards the lower end of the feeding trough under the action of gravity; when the roller feeding device needs to feed materials, the conveying gap of the roller feeding device is widened, the rod piece at the lower end of the feeding groove is transferred to the conveying gap through the pneumatic feeding device, and meanwhile, the clamping device keeps the clamping state of the rod piece conveyed by the roller feeding device, so that the rod piece is cut by the cutter; after the feeding is finished, the conveying gap of the roller feeding device is restored, and the rod piece conveyed by the roller feeding device and fed by the roller feeding device is abutted against the end part of the rod piece clamped by the clamping device; after cutting, the roller feeding device drives the rod piece to move again, so that the rod piece sequentially passes through the clamping device and the cutting knife, then the clamping device clamps the rod piece, and the cutting knife continuously cuts the rod piece; in the process, the pneumatic feeding device is matched with the feeding groove to realize mechanical feeding operation of the rod piece, and the clamping device is used for clamping the rod piece on the roller feeding device in the cutting process, so that the rod piece feeding operation and the cutting operation are prevented from interfering with each other, and the working efficiency of the cutting machine is improved.

The utility model discloses further set up to: clamping device including set up in centre gripping cylinder in the frame with lower holder, rotate connect in the frame and arrange in the punch holder of holder top down, centre gripping cylinder acts on the punch holder, so that the exposed core of punch holder is close to or keeps away from the motion of lower holder.

Through adopting above-mentioned technical scheme, form a centre gripping clearance that supplies the member to wear to establish between punch holder and the lower holder, simultaneously to the mode that the centre gripping cylinder compressed tightly the member as the driving source drive punch holder, can make and keep suitable clamp force between member and punch holder and the lower holder, avoid the member pressurized deformation.

The utility model discloses further set up to: the piston rod of the clamping cylinder is hinged with a positioning block, the positioning block is rotatably connected with a positioning screw rod, and the positioning screw rod is in threaded connection with the upper clamping plate.

By adopting the technical scheme, the upper clamping plate, the positioning screw rod and the piston rod of the clamping cylinder jointly form a connecting rod structure so as to realize the clamping and releasing action of the upper clamping plate; in addition, the length of the section of the positioning screw rod between the upper clamping plate and the piston rod of the clamping cylinder can be changed by rotating the positioning screw rod, so that the gap width of a clamping gap between the upper clamping plate and the lower clamping seat is adjusted, the clamping device is suitable for clamping rod pieces with different diameters, and the clamping device has good universality.

The utility model discloses further set up to: the roller feeding device comprises a support, a feeding motor, at least two lower driving wheels, a first belt driving part, at least two feeding cylinders and an upper driving wheel, wherein the support and the feeding motor are arranged on the rack, the at least two lower driving wheels are rotatably connected onto the support, the first belt driving part is arranged between an output shaft of the feeding motor and the lower driving wheels, the at least two feeding cylinders are arranged on the support, the upper driving wheel is arranged on a piston rod of each feeding cylinder, and a conveying gap is formed between the upper driving wheels and the lower driving wheels.

By adopting the technical scheme, the feeding motor is used as a driving source, and the first belt transmission part is used for realizing synchronous transmission among the lower transmission wheels, so that the lower transmission wheels drive the rod piece to advance together; meanwhile, the feeding air cylinders respectively drive the upper transmission wheels to lift, when the next rod piece is fed, other upper transmission wheels can also continuously carry out compression transmission on the previous rod piece, and therefore the cutting machine can keep better cutting efficiency; in addition, the mode that the feeding cylinder is used as a driving source to drive the upper driving wheel to press the rod piece enables the rod piece and the upper driving wheel and the lower driving wheel to keep proper pre-pressure, so that sequential transmission of the upper driving wheel, the rod piece and the lower driving wheel is realized.

The utility model discloses further set up to: the lower end of the feeding groove is provided with a self-rotating U-shaped rod and a torsion spring arranged between the U-shaped rod and the feeding groove, one end of the U-shaped rod is inserted between two lower driving wheels, the other end of the U-shaped rod is arranged on a feeding path of a rod piece of the pneumatic feeding device, and the torsion spring is used for forcing the U-shaped rod to turn upwards and shield the conveying gap.

Through adopting above-mentioned technical scheme, when member one end on the gyro wheel material feeding unit breaks away from U type pole, the torsional spring can force U type pole upwards to overturn, only when next member pack into conveying clearance and press on U type pole, U type pole just can be pressed and move down, simultaneously, this member just can be carried to contradict with the tip of last member by gyro wheel material feeding unit, can avoid the condition of mistake dress, can support the member at the in-process of member material loading again, guarantee the stability of member material loading.

The utility model discloses further set up to: pneumatic loading attachment including set up in material loading cylinder in the frame, rotate connect in movable plate in the frame, set up in movable plate upper end just is the recess of horn-shaped indent, the piston rod of material loading cylinder acts on the movable plate lower extreme and orders about the movable plate upset is in order to drive the member of going up the silo lower extreme passes through in proper order the lateral wall and the knuckle angle department of recess and orientation carry the clearance motion.

By adopting the technical scheme, the telescopic motion of the piston rod of the feeding cylinder can drive the movable plate to turn up and down according to a preset angle; when the rod piece is fed, the rod piece at the lower end of the feeding groove is in lap joint with the side wall of the groove, the movable plate is turned upwards at the moment and can drive the rod piece to move together along with the movable plate and be separated from the feeding groove, the rod piece falls to the folding angle of the groove under the guiding action of the side wall of the groove at the moment, then the movable plate is turned downwards, the rod piece moves together with the movable plate and is transferred to the upper driving wheel, then the movable plate continues to turn downwards and is separated from the rod piece, the rod piece on the feeding groove loses the blocking of the outer wall of the movable plate and falls to the side wall of the groove, and the operation is simple and rapid.

The utility model discloses further set up to: the frame is provided with a stop block for limiting the rod piece to move forwards continuously, and the stop block is arranged on one side, away from the clamping device, of the cutting knife.

By adopting the technical scheme, the length of the cut rod piece can be ensured to be consistent.

The utility model discloses further set up to: the adjustable clamp is characterized in that an adjusting nut and a sliding seat are arranged on the rack, an adjusting screw rod is connected to the adjusting nut in a threaded mode, and the stop block is arranged on the adjusting screw rod and connected to the sliding seat in a sliding mode.

Through adopting above-mentioned technical scheme, the screw rod transmission has the advantage that start-up moment is little, the auto-lock is good, through rotatory accommodate the lead screw, can fix a point and adjust the distance between dog and the cutting knife to can change the member length of cutting out comparatively accurately, make the cutting machine have good commonality.

The utility model discloses further set up to: the driving device comprises a driving motor and a driving cylinder which are arranged on the rack, a driving shaft which is coaxially arranged on the cutting knife, a second belt transmission piece which is arranged between an output shaft of the driving motor and the driving shaft, and a driving rod, wherein one end of the driving rod is rotatably connected to the driving shaft, and the other end of the driving rod is hinged to a piston rod of the driving cylinder.

Through adopting above-mentioned technical scheme, the second takes driving medium, drive shaft, actuating lever and drives actuating cylinder's piston rod to constitute the connecting rod structure jointly, under the condition that driving motor and drive actuating cylinder regard as the driving source respectively, realizes the rotation and the reciprocating curvilinear motion of cutting knife respectively to accomplish the cutting operation of cutting knife to the member.

The utility model discloses further set up to: and a discharge hole arranged below the cutting knife is arranged on the rack.

Through adopting above-mentioned technical scheme, the member after being cut by the cutting knife receives gravity whereabouts to directly pass through the discharge gate ejection of compact, the operation is simple and easy swift.

Compared with the prior art, the utility model discloses following beneficial effect has: the pneumatic feeding device is matched with the feeding groove to realize mechanical feeding operation of the rod piece, and the clamping device is used for clamping the rod piece on the roller feeding device in the cutting process, so that the rod piece feeding operation and the cutting operation are prevented from interfering with each other, and the working efficiency of the cutting machine is improved.

Drawings

Fig. 1 is a schematic structural view of a bar cutter according to an embodiment of the present invention.

Fig. 2 is a schematic view of a connection relationship between the feeding chute, the pneumatic feeding device and the roller feeding device of the embodiment of the present invention.

Fig. 3 is a schematic view of a connection relationship between the clamping device and the cutting unit according to an embodiment of the present invention.

In the above drawings: 1. a frame; 2. a feeding trough; 3. a pneumatic feeding device; 31. a feeding cylinder; 32. moving the plate; 33. a groove; 34. a U-shaped rod; 35. a torsion spring; 4. a roller feeding device; 41. a support; 42. a feeding motor; 43. a lower driving wheel; 44. a first belt drive; 441. a first driven wheel; 442. a first drive wheel; 443. a drive wheel; 444. a first drive belt; 45. a feeding cylinder; 46. a driving wheel is arranged; 5. a clamping device; 51. a clamping cylinder; 52. a lower clamping seat; 53. an upper splint; 54. positioning blocks; 55. positioning a screw rod; 6. a cutting unit; 7. a cutting knife; 8. a drive device; 81. a drive motor; 82. a driving cylinder; 83. a drive shaft; 84. a second belt drive; 841. a second drive wheel; 842. a second driven wheel; 843. a second belt; 844. a connecting plate; 85. a drive rod; 9. a length adjustment device; 91. adjusting the nut; 92. a slide base; 93. adjusting the screw rod; 94. a stopper; 10. and (4) a discharge port.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings and embodiments.

As shown in fig. 1, for the utility model discloses a rod cutting machine, including frame 1, be provided with feeding groove 2, pneumatic loading attachment 3, gyro wheel material feeding unit 4, clamping device 5, cutting unit 6 and discharge gate 10 on arranging in proper order on rod transport path in frame 1. Wherein, go up silo 2 and arrange and be used for installing the member side by side relatively the horizontal plane slope, gyro wheel material feeding unit 4 has and supplies the member to wear to establish and the wide adjustable conveying clearance in clearance and be used for ordering about member intermittent type nature removal, and pneumatic material feeding unit 3 is used for ordering about the member of going up silo 2 lower extreme and carries towards gyro wheel material feeding unit 4, and clamping device 5 is used for pressing from both sides the member of putting gyro wheel material feeding unit 4 transport. In addition, the cutting unit 6 comprises a cutting knife 7, a driving device 8 for driving the cutting knife 7 to make a reciprocating curvilinear cutting motion, and a length adjusting device 9 for limiting the rod piece to move forward continuously, and a discharge hole 10 is arranged below the cutting knife 7.

As shown in fig. 2, the roller feeding device 4 includes a bracket 41 and a feeding motor 42 disposed on the frame 1, two lower driving wheels 43 rotatably connected to the bracket 41, a first driving member 44 disposed between an output shaft of the feeding motor 42 and the lower driving wheels 43, two feeding cylinders 45 disposed on the bracket 41, and an upper driving wheel 46 disposed on a piston rod of the feeding cylinders 45, wherein a conveying gap is formed between the upper driving wheel 46 and the lower driving wheel 43. The first belt transmission member 44 includes a first driven wheel 441 disposed on the lower transmission wheel 43, two driving wheels 443 rotatably connected to the frame 1, a first driving wheel 442 disposed on the driving wheels 443, and three first transmission belts 444, wherein one of the first driving wheels 442 is disposed on the output shaft of the feeding motor 42, and the first transmission belts 444 are respectively sleeved between the first driving wheel 442 and the first driven wheel 441, and between the two driving wheels 443.

During feeding, the feeding motor 42 is used as a driving source, and the first belt transmission piece 44 is used for realizing synchronous transmission among the lower transmission wheels 43, so that the lower transmission wheels 43 jointly drive the rod pieces to advance. Meanwhile, the feeding air cylinder 45 drives the upper driving wheel 46 to lift, when the next rod piece is fed, other upper driving wheels 46 can also continuously compress and drive the previous rod piece, and the cutting machine can keep better cutting efficiency. In addition, the feeding cylinder 45 is used as a driving source to drive the upper transmission wheel 46 to press the rod piece, so that proper pre-pressure can be kept between the rod piece and the upper transmission wheel 46 and between the rod piece and the lower transmission wheel 43, and the sequential transmission of the upper transmission wheel 46, the rod piece and the lower transmission wheel 43 is realized.

The pneumatic feeding device 3 comprises a feeding cylinder 31 arranged on the frame 1, a moving plate 32 rotatably connected on the frame 1, and a groove 33 which is arranged at the upper end of the moving plate 32 and is in a horn shape and is concave inwards. The feeding cylinder 31 is arranged horizontally, a bar-shaped groove (not shown) perpendicular to the rotation axis of the moving plate 32 is arranged at the end of the piston rod of the feeding cylinder 31, and a pin shaft (not shown) slidably connected in the bar-shaped groove is arranged at the lower end of the moving plate 32. Therefore, the piston rod of the feeding cylinder 31 can act on the lower end of the moving plate 32 and drive the moving plate 32 to turn over, so as to drive the rod members at the lower end of the feeding chute 2 to sequentially pass through the side wall and the folding angle of the groove 33 and move towards the conveying gap. Because the rod piece only has the movable plate 32 to support the rod piece in the transferring process, in order to ensure the stability of the rod piece feeding, the lower end of the feeding groove 2 is provided with a U-shaped rod 34 capable of rotating and a torsion spring 35 arranged between the U-shaped rod 34 and the feeding groove 2. When pressed by the rod piece, one end of the U-shaped rod 34 is inserted between the two lower driving wheels 43, and the other end is arranged on the feeding path of the rod piece of the pneumatic feeding device 3. After the lever is disengaged from the U-shaped bar 34, the torsion spring 35 is used to force the U-shaped bar 34 to flip upwards and block the conveying gap.

When feeding, the telescopic motion of the piston rod of the feeding cylinder 31 can drive the moving plate 32 to turn up and down according to a predetermined angle. When the rod members are fed, the rod members at the lower end of the feeding groove 2 are lapped on the side walls of the grooves 33, the moving plate 32 is turned upwards at the moment, the rod members can be driven to move together with the moving plate 32 and be separated from the feeding groove 2, the rod members fall to the folding corners of the grooves 33 under the guiding action of the side walls of the grooves 33 at the moment, then the moving plate 32 is turned downwards, and the rod members move together with the moving plate 32 and are transferred to the upper driving wheels 46. Then the moving plate 32 continues to turn downwards and is separated from the rod, and the rod on the feeding chute 2 loses the block of the outer wall of the moving plate 32 and falls to the side wall of the groove 33, so that the operation is simple and quick.

As shown in fig. 3, in the cutting work area of the cutting machine, the clamping device 5 includes a clamping cylinder 51 and a lower holder 52 provided on the frame 1, and an upper clamp plate 53 rotatably connected to the frame 1 and disposed above the lower holder 52. Wherein, articulated on the piston rod of centre gripping cylinder 51 have a locating piece 54, rotate on the locating piece 54 and be connected with location lead screw 55, location lead screw 55 threaded connection is on the punch holder 53 to make the tip of punch holder 53 be close to or keep away from lower holder 52 motion.

The upper clamping plate 53, the positioning screw 55 and the piston rod of the clamping cylinder 51 together form a connecting rod structure to realize the clamping and releasing action of the upper clamping plate 53. Meanwhile, the clamping cylinder 51 is used as a driving source to drive the upper clamping plate 53 to compress the rod piece, so that a proper clamping force can be kept between the rod piece and the upper clamping plate 53 and between the rod piece and the lower clamping seat 52, and the rod piece is prevented from being deformed under pressure. In addition, by rotating the positioning screw 55, the length of the section of the positioning screw 55 between the upper clamp plate 53 and the piston rod of the clamping cylinder 51 can be changed, so that the gap width of the clamping gap between the upper clamp plate 53 and the lower clamp seat 52 can be adjusted to adapt to clamping of rod pieces with different diameters, and the clamping device 5 has good universality.

The driving device 8 includes a driving motor 81 and a driving cylinder 82 provided on the frame 1, a driving shaft 83 coaxially provided on the cutting blade 7, a second belt transmission member 84 provided between an output shaft of the driving motor 81 and the driving shaft 83, and a driving rod 85. One end of the driving rod 85 is rotatably connected to the driving shaft 83, and the other end is hinged to the piston rod of the driving cylinder 82. The second belt transmission member 84 includes a second driving wheel 841 disposed on the output shaft of the driving motor 81, a connecting plate 844 rotatably connected to the second driving wheel 841, a second driven wheel 842 rotatably connected to the connecting plate 844 and disposed on the driving seat, and a second transmission belt 843 sleeved between the second driving wheel 841 and the second driven wheel 842. The second belt transmission member 84, the driving shaft 83, the driving rod 85 and the piston rod of the driving cylinder 82 jointly form a connecting rod structure, and under the condition that the driving motor 81 and the driving cylinder 82 are respectively used as driving sources, the autorotation and the reciprocating curvilinear motion of the cutting knife 7 are respectively realized, so that the cutting operation of the cutting knife 7 on the rod piece is completed.

The length adjusting device 9 comprises an adjusting nut 91 and a sliding seat 92 which are arranged on the frame 1, an adjusting screw 93 which is in threaded connection with the adjusting nut 91, and a stop block 94 which is arranged at one end of the adjusting screw 93 close to the cutting knife 7 and is in sliding connection with the sliding seat 92. The screw rod transmission has the advantages of small starting torque and good self-locking, and the distance between the stop block 94 and the cutting knife 7 can be adjusted at a fixed point by rotating the adjusting screw rod 93, so that the length of the cut rod can be changed accurately, the length of the cut rod can be ensured to be consistent, and the cutting machine has good universality.

The detailed working process of the embodiment is as follows:

s1, arranging a plurality of rod pieces on the feeding chute 2 in parallel in advance, wherein the rod pieces can move towards the lower end of the feeding chute 2 under the action of gravity;

s2, when the roller feeding device 4 needs to feed, the conveying gap of the roller feeding device 4 is widened, the rod piece at the lower end of the feeding groove 2 is transferred to the conveying gap through the pneumatic feeding device 3, and meanwhile, the clamping device 5 keeps the clamping state of the rod piece conveyed by the roller feeding device 4, so that the rod piece is cut by the cutting knife 7;

s3, after the feeding is finished, the conveying gap of the roller feeding device 4 is restored, and the rod piece conveyed and fed by the roller feeding device 4 is abutted to the end part of the rod piece clamped by the clamping device 5;

s4, after the cutting is finished, the roller feeding device 4 drives the rod piece to move to abut against the stop block 94 again, so that the rod piece sequentially passes through the clamping device 5 and the cutting knife 7, then the clamping device 5 clamps the rod piece, and the cutting knife 7 continues to cut the rod piece;

s5 the rod piece cut by the cutting knife 7 falls by gravity and is directly discharged through the discharge hole 10.

Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims

1. The utility model provides a rod cutting machine, includes frame (1), cutting knife (7), be provided with on frame (1) and be used for driving about rod intermittent type nature removal roller material feeding unit (4) and be used for driving about cutting knife (7) are reciprocating curved cutting motion's drive arrangement (8), its characterized in that: still be provided with clamping device (5) that are used for pressing from both sides the member that roller material feeding unit (4) carried on frame (1), relative horizontal plane slope arrange and be used for installing last silo (2) and pneumatic loading attachment (3) of member side by side, roller material feeding unit (4) have supply the member to wear to establish and the wide adjustable conveying clearance in clearance, pneumatic loading attachment (3) are used for ordering about go up the member of silo (2) lower extreme and move towards conveying clearance.

2. A bar cutter according to claim 1, wherein: clamping device (5) including set up in centre gripping cylinder (51) and lower holder (52), rotation on frame (1) connect in on frame (1) and arrange in punch holder (53) of holder (52) top down, centre gripping cylinder (51) act on punch holder (53) go up, so that the exposed core of punch holder (53) is close to or keeps away from lower holder (52) motion.

3. A bar cutter according to claim 2, wherein: a positioning block (54) is hinged to a piston rod of the clamping cylinder (51), a positioning screw rod (55) is rotatably connected to the positioning block (54), and the positioning screw rod (55) is in threaded connection with the upper clamping plate (53).

4. A bar cutter according to claim 1, wherein: roller material feeding unit (4) including set up in support (41) and feeding motor (42), at least two on frame (1) rotate connect in lower drive wheel (43) on support (41), set up in first drive spare (44) between the output shaft of feeding motor (42) and these lower drive wheels (43), at least two set up in pay-off cylinder (45) on support (41) and set up in last drive wheel (46) on the piston rod of pay-off cylinder (45), form between these last drive wheel (46) and lower drive wheel (43) conveying clearance.

5. A bar cutter according to claim 4, wherein: the lower end of the feeding groove (2) is provided with a self-rotating U-shaped rod (34) and a torsion spring (35) arranged between the U-shaped rod (34) and the feeding groove (2), one end of the U-shaped rod (34) is inserted between two lower driving wheels (43), the other end of the U-shaped rod is arranged on a feeding path of a rod piece of the pneumatic feeding device (3), and the torsion spring (35) is used for forcing the U-shaped rod (34) to upwards overturn and shield the conveying gap.

6. A bar cutter according to claim 5, wherein: pneumatic loading attachment (3) including set up in material loading cylinder (31), rotation on frame (1) connect in movable plate (32) on frame (1), set up in movable plate (32) upper end just is recess (33) of horniness indent, the piston rod of material loading cylinder (31) acts on movable plate (32) lower extreme and orders about movable plate (32) upset, in order to drive go up the member of silo (2) lower extreme and pass through in proper order the lateral wall and the dog-ear department of recess (33) and orientation carry the clearance motion.

7. A bar cutter according to claim 1, wherein: the frame (1) is provided with a stop block (94) for limiting the rod piece to move forwards continuously, and the stop block (94) is arranged on one side, departing from the clamping device (5), of the cutting knife (7).

8. A bar cutter according to claim 7, wherein: the adjustable clamp is characterized in that an adjusting nut (91) and a sliding seat (92) are arranged on the rack (1), an adjusting screw rod (93) is connected to the adjusting nut (91) in a threaded mode, and a stop block (94) is arranged on the adjusting screw rod (93) and connected to the sliding seat (92) in a sliding mode.

9. A bar cutter according to claim 1, wherein: the driving device (8) comprises a driving motor (81) and a driving cylinder (82) which are arranged on the rack (1), a driving shaft (83) which is coaxially arranged on the cutting knife (7), a second belt transmission piece (84) which is arranged between an output shaft of the driving motor (81) and the driving shaft (83), and a driving rod (85), wherein one end of the driving rod (85) is rotatably connected to the driving shaft (83), and the other end of the driving rod is hinged to a piston rod of the driving cylinder (82).

10. A bar cutter according to claim 1, wherein: a discharge hole (10) arranged below the cutting knife (7) is arranged on the frame (1).