CN111113129B

CN111113129B - Bar cutting equipment

Info

Publication number: CN111113129B
Application number: CN202010007523.4A
Authority: CN
Inventors: 王亚炳
Original assignee: Ningbo Hengyuan Shaft Industry Co ltd
Current assignee: Ningbo Hengyuan Shaft Industry Co ltd
Priority date: 2020-01-04
Filing date: 2020-01-04
Publication date: 2021-09-24
Anticipated expiration: 2040-01-04
Also published as: CN111113129A

Abstract

The invention relates to bar cutting equipment which comprises a rack, a pneumatic chuck and a workbench, wherein the pneumatic chuck and the workbench are arranged on the rack, the bar cutting equipment also comprises a feeding unit used for feeding bars into the pneumatic chuck, and the feeding unit comprises a feeding slide rail and a transfer component which are sequentially arranged along the bar conveying direction; the feeding slide rail extends along the axial direction of the pneumatic chuck; the transfer assembly comprises a transfer seat and a feeding rod, wherein the transfer seat is arranged at the output end of the feeding slide rail and the input end of the pneumatic chuck in a sliding mode, the feeding rod is coaxial with the pneumatic chuck, a storage channel is arranged on the transfer seat, the storage channel is parallel to the axis of the pneumatic chuck, and the feeding rod is arranged in a sliding mode along the axis direction of the feeding rod. The automatic feeding device has the advantages that the rods are fed into the pneumatic chuck one by one through the feeding hopper, the feeding slide rail and the transfer device, the purpose of automatic feeding is achieved, and the production quality and the production efficiency are improved.

Description

Bar cutting equipment

Technical Field

The invention relates to the technical field of shaft machining equipment, in particular to bar stock cutting equipment.

Background

A lathe is a machine tool for turning a rotating workpiece mainly with a turning tool. The lathe can also be used for corresponding processing by using a drill bit, a reamer, a screw tap, a die, a knurling tool and the like.

The numerical control lathe comprises a machine frame placed on the ground, a workbench arranged on the machine frame and used for moving, a machining tool used for machining a part and a pneumatic chuck used for clamping the part. In the production of bar stock cutting, a bar stock needs to be manually conveyed into a pneumatic chuck, then the pneumatic chuck clamps and fixes the bar stock, cutting is carried out, and after the cutting is finished, the pneumatic chuck rapidly pushes out the bar stock to finish the blanking work.

The above prior art solutions have the following drawbacks:

in the scheme, the bars need to be manually conveyed into the pneumatic chuck one by one, the positioning accuracy of the bars during feeding is greatly deviated by different working experience personnel, the feeding efficiency is low, and the production quality and the production efficiency are influenced.

Disclosure of Invention

Aiming at the defects in the prior art, one of the purposes of the invention is to provide bar stock cutting equipment, wherein bars are fed into a pneumatic chuck one by one through a feed hopper, a feeding slide rail and a transfer device, so that the purpose of automatic feeding is realized, and the production quality and efficiency are improved.

The above object of the present invention is achieved by the following technical solutions:

a bar cutting device comprises a rack, a pneumatic chuck and a workbench which are arranged on the rack, and a feeding unit for feeding bars to the pneumatic chuck, wherein the feeding unit comprises a feeding slide rail and a transfer component which are sequentially arranged along the bar conveying direction;

the feeding slide rail extends along the axial direction of the pneumatic chuck;

the transfer assembly comprises a transfer seat and a feeding rod, wherein the transfer seat is arranged at the output end of the feeding slide rail and the input end of the pneumatic chuck in a sliding mode, the feeding rod is coaxial with the pneumatic chuck, a storage channel is arranged on the transfer seat, the storage channel is parallel to the axis of the pneumatic chuck, and the feeding rod is arranged in a sliding mode along the axis direction of the feeding rod.

Through adopting above-mentioned technical scheme, place the bar on the pay-off slide rail one by one, then promote the bar and remove along the pay-off slide rail, the bar gets into in the storage channel, until the bar breaks away from the pay-off slide rail completely, then shift the seat and remove to storage channel and pneumatic chuck alignment, and drive the material loading pole and remove, the material loading pole promotes the bar in the storage channel and gets into in the pneumatic chuck, and make the bar break away from the storage channel, realize automatic material loading's purpose, then shift the seat and remove to the pay-off slide rail again, carry out the processing to the bar simultaneously, after the processing is accomplished, the pneumatic chuck will help the lining to release the unloading fast, repeat foretell action, realize automatic material loading, the purpose of processing and unloading, production quality and efficiency have been promoted promptly.

The present invention in a preferred example may be further configured to: the feeding unit is characterized by further comprising a feeding hopper arranged on one side of the width direction of the feeding slide rail, the feeding hopper comprises a support plate inclined towards the direction of the feeding slide rail and a baffle plate located between the feeding slide rail and the support plate, the baffle plate extends along the vertical direction, a guide plate is arranged on one side of the baffle plate facing the feeding slide rail, one end, away from the baffle plate, of the guide plate extends onto the feeding slide rail, a pushing plate is arranged on one side of the baffle plate along the vertical direction in a sliding mode, and an inclined plane parallel to the support plate is arranged at the upper end of the pushing plate.

Through adopting above-mentioned technical scheme, drop into a large amount of bars in the feeder hopper, the bar rolls to the butt in the striker plate along the backup pad to there is the bar joint between the upper end of scraping wings and striker plate, feeding cylinder pulling scraping wings rebound, the scraping wings drives the butt upwards in the bar on inclined plane, crosses the striker plate until this bar, and the bar rolls to the pay-off slide rail along the guide board again in, realizes the purpose of material loading one by one in the pay-off slide rail.

The present invention in a preferred example may be further configured to: the top of guide board and the one side that is close to the pay-off slide rail are provided with the barrier plate that goes up and down along vertical direction, the lower extreme that blocks the board stops the bar with the guide board cooperation and rolls along the guide board, just the barrier plate sets up with the slip opposite direction of scraping wings.

Through adopting above-mentioned technical scheme, when stopping that the cylinder stretches out, the one end butt that the barrier plate is close to the pay-off slide rail with the guide board, and set for the slip opposite direction of barrier plate and scraping wings, when scraping wings rebound promptly, the barrier plate downstream, make the bar temporarily exist between barrier plate and guide board, make the bar stop rolling, and make the bar be on a parallel with the pay-off slide rail, and then when scraping wings rebound, the barrier plate rebound, the bar continues to roll a segment distance along the guide board and gets into in the pay-off slide rail, realize the purpose of stabilizing the pay-off in the pay-off slide rail, the purpose of pay-off one by one in the pay-off slide rail is realized to the action of repetition foretell realization.

The present invention in a preferred example may be further configured to: the transfer seat goes up and down along the vertical direction, a pair of opposite or back-to-back rotating clamping pieces are hinged to the transfer seat, the storage channel is formed between the clamping pieces, the rotating axis of the clamping pieces is parallel to the axis direction of the bar, and a material pushing rod for pushing the bar is arranged in the feeding slide rail in a sliding mode.

By adopting the technical scheme, when the storage channel is aligned with the feeding slide rail, a bar is pushed into the material storage cylinder, when the transfer seat is moved to the position where the storage channel is coaxial with the pneumatic chuck, the piston end of the feeding cylinder is coaxial with the pneumatic chuck, the feeding rod extends out and pushes the bar in the storage channel to enter the pneumatic chuck, finally the transfer seat moves towards the feeding slide rail to start to process the bar, after the processing is finished, the pneumatic chuck rapidly pushes out the bar, and the actions are repeated to realize the automatic feeding, processing and discharging of the bar.

The present invention in a preferred example may be further configured to: the transfer seat is provided with a pair of pivot that is used for articulated holder, the cover is equipped with the torsional spring in the pivot, the one end of torsional spring is fixed with the transfer seat, and the other end is fixed with the holder, just the torsional spring has the relative pivoted trend of drive holder.

Through adopting above-mentioned technical scheme, when the bar was pushed to the memory channel in, the bar extrusion gets into between the holder, realize the purpose of holder pre-fixing bar promptly, avoid removing the in-process bar and dropping at the transfer seat, when the bar in the memory channel is pushed pneumatic chuck simultaneously, the bar still has the part to stay between the holder, when the transfer seat is direct upwards, the bar is fixed by pneumatic chuck, make holder looks back of the body rotate, realize the purpose of stably shifting the bar.

The present invention in a preferred example may be further configured to: the upper end of holder slides and pegs graft and has the butt piece, the butt piece slides along the direction of perpendicular to pivot, the one end of shifting the seat towards the holder is provided with the V-arrangement groove, the V-arrangement groove extends the setting in the direction of pivot on a parallel with, the butt piece is respectively in the inner wall slip butt in the V-arrangement groove.

Through adopting above-mentioned technical scheme, when the butt piece upwards stretches out, the butt piece slides the butt with the inner wall in V-arrangement groove, back of the body rotation between the holder for the storage channel slightly is greater than the bar, the frictional force that receives when reducing the bar and getting into the storage channel, the fish tail degree in the bar transportation has been reduced promptly, after the bar got into the storage channel, the butt piece is controlled again and is removed to keeping away from the V-arrangement groove, the torsional spring drives the holder once more and rotates to pressing from both sides tight bar relatively, guarantee the stability of bar transportation.

The present invention in a preferred example may be further configured to: the utility model discloses a support spring, including the clamping piece, the clamping piece is provided with the butt piece, the butt piece is provided with the thrust spring that pushes away the slip piece relative movement in the clamping piece, the butt piece is provided with the supporting spring that pushes away to the removal of V-arrangement groove in the clamping piece, the butt piece is provided with the stress surface with the bar slip butt towards one side of pay-off slide rail.

Through adopting above-mentioned technical scheme, when pushing the bar into storage channel, the tip of bar and the atress face slip butt of extrusion piece for moving back and forth between the extrusion piece, the face of leading simultaneously and the butt that slides between the butt piece make butt piece downstream, realize the purpose that the holder rotated relatively and presss from both sides tight bar promptly.

The present invention in a preferred example may be further configured to: install the transfer cylinder that the drive shifted the seat in the frame, the one end that the holder is relative just is located storage channel's downside and is provided with pressure sensor, pressure sensor: the piston rod is used for receiving the pressure signal and starting the extension of the piston rod of the transfer cylinder.

Through adopting above-mentioned technical scheme, get into the storage material way when the bar and make the holder rotate relatively gradually, make the pressure that pressure sensor received increase gradually, pressure that receives when pressure sensor reaches the default, represent that the bar breaks away from the pay-off slide rail completely promptly, the control shifts the seat simultaneously and moves to storage material way and aligns with pneumatic chuck, then when the bar is pushed into pneumatic chuck, the bar moves when breaking away from and extruding the butt of piece, pressure sensor receives the pressure and reduces, control to shift the seat promptly and move to the pay-off slide rail, realize automatic material loading process.

In summary, the invention includes at least one of the following beneficial technical effects:

the bars are stacked in the feed hopper, the material pushing plates send the bars to the feeding slide rail one by one, then the bars are pushed into the space between the clamping pieces, and finally the bars are sent into the pneumatic chuck through the transfer assembly, so that automatic feeding is realized, and the production quality and the efficiency are improved.

Drawings

FIG. 1 is a schematic view of the general assembly of a bar stock cutting apparatus;

FIG. 2 is a schematic view of the structure of a loading unit;

FIG. 3 is a schematic diagram illustrating the position of the transfer unit in the rack;

FIG. 4 is a schematic diagram of a transfer assembly used in one embodiment;

FIG. 5 is a schematic view of a transfer unit according to a second embodiment;

FIG. 6 is a schematic view of a holder structure used in the second embodiment;

fig. 7 is a schematic view for embodying a sliding structure of the driving abutting piece.

In the figure, 1, a frame; 2. a pneumatic chuck; 3. a feeding frame; 4. a feed hopper; 41. a side plate; 42. a support plate; 43. a striker plate; 44. a material pushing plate; 45. a feed cylinder; 46. a guide plate; 5. an extension frame; 51. a blocking cylinder; 52. a blocking plate; 6. a feeding slide rail; 61. a support rail; 62. an extension pipe; 63. a material pushing cylinder; 7. a transfer cylinder; 8. a transfer seat; 81. an ear plate; 82. a rotating shaft; 83. a torsion spring; 84. a V-shaped groove; 9. a clamping member; 91. a storage channel; 92. abutting the sheet; 93. extruding the sheet; 931. a guide surface; 932. a stress surface; 94. an extension piece; 95. a thrust spring; 96. a support spring; 10. a feeding cylinder; 11. a pressure sensor; 12. a work bench.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The first embodiment is as follows:

as shown in fig. 1, a bar stock cutting device comprises a rack 1, a pneumatic chuck 2 arranged in the rack 1 and a workbench 12, wherein the workbench 12 can move along a direction vertical to or parallel to the axis of the pneumatic chuck 2, a cutter is fixed on the workbench 12, a bar stock is fixed in the pneumatic chuck 2, the pneumatic chuck 2 drives the bar stock to rotate at a high speed, and then the workbench 12 is driven to drive the cutter to move, so that the bar stock cutting operation is realized.

As shown in fig. 1 and 2, a feeding frame 3 and a feeding slide rail 6 are fixed outside the machine frame 1, the feeding slide rail 6 includes a support rail 61 and an extension pipe 62, the support rail 61 is fixed at the upper end of the feeding frame 3, a material clamping groove extending along the direction parallel to the axial line of the pneumatic chuck 2 is arranged at the upper end of the supporting rail 61, one end of the extension pipe 62 is aligned with one end of the supporting rail 61 close to the frame 1, the extension pipe 62 is transmitted into the frame 1, and a material pushing cylinder 63 is fixed at one end of the material loading frame 3, which is positioned at the supporting rail 61 and is far away from the machine frame 1, the piston end of the material pushing cylinder 63 moves in the material clamping groove, wherein the feeding frame 3 is also provided with a feed hopper 4, when a bar material in the feed hopper 4 is placed in the clamping groove, the piston end of the pushing cylinder 63 pushes the bar material to enter the machine frame 1 through the extension pipe 62, a transfer assembly for transferring the rod material in the extension pipe 62 to the pneumatic chuck 2 is provided in the housing 1.

As shown in fig. 2, wherein the feeding hopper 4 is located at one side of the width direction of the supporting rail 61, the feeding hopper 4 comprises a pair of parallel side plates 41 and a supporting plate 42 fixed between the side plates 41, the side plates 41 extend along the length direction of the sliding rail, the supporting plate 42 is disposed obliquely to the direction of the supporting rail 61, a material baffle plate 43 is fixed at one end of the side plate 41 close to the support rail 61, a material pushing plate 44 is arranged between the material baffle plate 43 and the support plate 42, the upper end of the material pushing plate 44 is provided with an inclined plane parallel to the support plate 42, a feeding cylinder 45 is fixed at the upper end between the side plates 41, a connecting part is arranged between the piston end of the feeding cylinder 45 and the material pushing plate 44, the feeding cylinder 45 drives the feeding plate to lift in the vertical direction, meanwhile, a guide plate 46 is fixed at the upper end of the material baffle plate 43 and on the side away from the support plate 42, the guide plate 46 is inclined towards the feeding slide rail 6, and the lower end of the guide plate 46 is abutted against the feeding slide rail 6;

a large amount of bars are put into the feeding hopper 4, the bars roll to the butt on the material blocking plate 43 along the supporting plate 42, the bars are clamped between the upper end of the material pushing plate 44 and the material blocking plate 43, the feeding cylinder 45 pulls the material pushing plate 44 to move upwards, the material pushing plate 44 drives the butt on the inclined plane to move upwards until the bars cross the material blocking plate 43, the bars roll to the material blocking groove along the guiding plate 46 again, and the purpose of feeding the materials one by one into the feeding slide rail 6 is achieved.

As shown in fig. 2, an extension frame 5 is fixed between the side plates 41 and on one side of the striker plate 43 facing the feeding slide rail 6, a blocking cylinder 51 is fixed on the extension frame 5, and a blocking plate 52 is fixed on a piston end of the blocking cylinder; when the blocking cylinder 51 extends out, the blocking plate 52 is abutted against one end of the guide plate 46 close to the feeding slide rail 6, and the sliding direction of the blocking plate 52 is set to be opposite to that of the pushing plate 44, namely when the pushing plate 44 moves upwards, the blocking plate 52 moves downwards, so that the bar stock temporarily exists between the blocking plate 52 and the guide plate 46, the bar stock stops rolling and is parallel to the feeding slide rail 6, then when the pushing plate 44 moves downwards, the blocking plate 52 moves upwards, the bar stock continues to roll for a short distance along the guide plate 46 to enter the clamping groove, the purpose of stable feeding in the feeding slide rail 6 is realized, and the purpose of feeding one by one into the feeding slide rail 6 is realized by repeating the actions.

As shown in fig. 3 and 4, the transfer assembly includes a transfer cylinder 7 fixed in the frame 1, a piston end of the transfer cylinder 7 extends and retracts in a vertical direction, a transfer seat 8 is fixed at the piston end of the transfer cylinder 7, a pair of clamping members 9 is hinged at the lower end of the transfer seat 8, a storage channel 91 is formed between the clamping members 9, the storage channel 91 is parallel to the axis of the pneumatic chuck 2, when the piston end of the transfer cylinder 7 contracts, the storage channel 91 is aligned with the extension pipe 62, a rod is pushed into the storage cylinder through the pushing cylinder 63, then the piston end of the transfer cylinder 7 extends out, so that the storage channel 91 is coaxial with the pneumatic chuck 2, a feeding cylinder 10 is fixed on the worktable 12, the worktable 12 is moved to make the piston end of the feeding cylinder 10 coaxial with the pneumatic chuck 2, a feeding rod is fixed at the piston end of the feeding cylinder 10, the feeding rod extends out and pushes the rod in the storage channel 91 into the pneumatic chuck 2, and finally, the piston end of the transfer cylinder 7 is withdrawn, the bar is machined, after the machining is finished, the pneumatic chuck 2 rapidly ejects the bar, and the actions are repeated to realize the automatic feeding, machining and discharging of the bar.

As shown in fig. 3 and 4, two sets of ear plates 81 extend from the lower end of the transfer seat 8, a rotating shaft 82 is installed between the ear plates 81, the clamping member 9 fixes the rotating shaft 82, and a torsion spring 83 is sleeved on the rotating shaft 82, one end of the torsion spring 83 is fixed with the transfer seat 8, the other end is fixed with the clamping member 9, and the diameter of the storage channel 91 is slightly smaller than that of the bar stock, when the bar stock is pushed into the storage channel 91, the bar stock is squeezed into the clamping member 9, namely, the purpose of pre-fixing the bar stock by the clamping member 9 is achieved, the bar stock is prevented from falling off in the moving process of the transfer seat 8, meanwhile, when the bar stock in the storage channel 91 is pushed into the pneumatic chuck 2, the bar stock still partially remains between the clamping members 9, when the transfer seat 8 is directly upward, the bar stock is fixed by the pneumatic chuck 2, so that the clamping member 9 rotates oppositely, and the purpose of stably transferring the bar stock is achieved.

The implementation principle of the embodiment is as follows:

the method comprises the steps of putting bars into a feeding hopper 4, jacking the bars one by a material pushing plate 44, enabling the bars to cross a material blocking plate 43 and roll to a feeding slide rail 6, then jacking the bars into a storage channel 91 by a material pushing cylinder 63, extruding and fixing the bars between clamping pieces 9, driving the bars to descend to be aligned with a pneumatic chuck 2 by a transfer seat 8, driving feeding by a feeding cylinder 10 to jack the bars into the pneumatic chuck 2, starting processing the bars after the transfer seat 8 rises, rapidly jacking the bars by the pneumatic chuck 2 after processing is completed, and repeating the actions to realize automatic feeding, processing and discharging of the bars.

The second embodiment is different from the first embodiment in that:

as shown in fig. 5 to 7, the lower end of the transfer seat 8 is provided with a V-shaped groove 84, the V-shaped groove 84 extends along a length direction parallel to the storage channel 91, an insertion groove is formed in the upper end of the clamping piece 9 along the vertical direction, a contact piece 92 is embedded in the insertion groove in a sliding manner, when the contact piece 92 extends upwards, the contact piece 92 slides and contacts with the inner wall of the V-shaped groove 84, the clamping piece 9 rotates back and forth, so that the storage channel 91 is slightly larger than a bar, the friction force applied when the bar enters the storage channel 91 is reduced, namely, the scratch degree in the bar transportation process is reduced, after the bar enters the storage channel 91, the contact piece 92 is controlled to move away from the V-shaped groove 84, the torsion spring 83 drives the clamping piece 9 to rotate relatively to clamp the bar again, and the stability of the bar transportation is ensured.

A communicating groove is formed in the clamping piece 9 and located in the storage channel 91, the communicating groove extends in the direction perpendicular to the storage channel 91 and is communicated with the inserting groove, a pressing piece 93 is embedded in the communicating groove, an extending piece 94 is fixed at one end, opposite to the end between the pressing pieces 93, the extending piece 94 penetrates through the abutting piece 92 in a sliding mode, a guide surface 931 is arranged between the lower end surface of the extending piece 94 and the lower end surface of the pressing piece 93, the guide surface 931 is arranged in an inclined mode, the guide surface 931 is in sliding abutting connection with the abutting piece 92, meanwhile, a supporting spring 96 pushing the abutting piece 92 to move upwards is installed in the inserting groove, thrust springs 95 pushing the pressing pieces 93 to move relatively are installed in the communicating groove respectively, and a force bearing surface 932 facing the feeding slide way is arranged at the opposite end between the pressing pieces 93;

when pushing bar stock into storage channel 91, the tip of bar stock slides the butt with the atress face 932 of extrusion piece 93 for back of the body moves between the extrusion piece 93, and the butt that slides between guide surface 931 and the butt piece 92 simultaneously makes butt piece 92 remove downwards, realizes the purpose that holder 9 rotated relatively and presss from both sides tight bar stock promptly.

And a pressure sensor 11 is arranged at one end opposite to the clamping piece 9 and positioned at the lower side of the storage channel 91, when the bar stock enters the storage channel 91, the clamping piece 9 gradually rotates relatively, so that the pressure received by the pressure sensor 11 gradually increases, when the pressure received by the pressure sensor 11 reaches a preset value, the bar stock is completely separated from the feeding slide rail 6, and meanwhile, a signal is sent to the transfer cylinder 7, so that the piston end of the transfer cylinder 7 extends out, and then when the bar stock is pushed into the pneumatic chuck 2, the bar stock moves to be separated from the butt joint with the extrusion sheet 93, the pressure received by the pressure sensor 11 decreases, namely, the piston end of the transfer cylinder 7 is controlled to be withdrawn, so that an automatic feeding process is realized.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. The utility model provides a bar stock cutting equipment, includes frame (1), sets up pneumatic chuck (2) and workstation (12) on frame (1), its characterized in that: the feeding unit is used for feeding the bars into the pneumatic chuck (2), and comprises a feeding slide rail (6) and a transfer component which are sequentially arranged along the bar conveying direction;

the feeding slide rail (6) extends along the axial direction of the pneumatic chuck (2);

the transfer assembly comprises a transfer seat (8) arranged at the output end of the feeding slide rail (6) and the input end of the pneumatic chuck (2) in a sliding manner and a feeding rod coaxial with the pneumatic chuck (2), wherein a storage channel (91) is arranged on the transfer seat (8), the storage channel (91) is parallel to the axis of the pneumatic chuck (2), and the feeding rod is arranged in a sliding manner along the axis direction of the pneumatic chuck (2);

the transfer seat (8) is lifted along the vertical direction, a pair of clamping pieces (9) capable of rotating oppositely and reversely are hinged to the transfer seat (8), a storage channel (91) is formed between the clamping pieces (9), the rotating axis of each clamping piece (9) is parallel to the axis direction of the bar stock, and a material pushing rod for pushing the bar stock is arranged in the feeding slide rail (6) in a sliding manner;

the transfer seat (8) is provided with a pair of rotating shafts (82) used for hinging the clamping pieces (9), the rotating shafts (82) are sleeved with torsion springs (83), one ends of the torsion springs (83) are fixed with the transfer seat (8), the other ends of the torsion springs (83) are fixed with the clamping pieces (9), and the torsion springs (83) have the tendency of driving the clamping pieces (9) to rotate relatively;

the upper end of the clamping piece (9) is inserted with a contact piece (92) in a sliding and inserting mode, the contact piece (92) slides along the axial direction perpendicular to the rotating shaft (82), one end, facing the clamping piece (9), of the transfer seat (8) is provided with a V-shaped groove (84), the V-shaped groove (84) extends in the axial direction parallel to the rotating shaft (82), and the two contact pieces (92) are respectively in sliding contact with the inner wall of the V-shaped groove (84);

the opposite ends of the clamping pieces (9) are respectively provided with a communicating groove in the storage channel (91), the communicating groove extends along the axial direction vertical to the rotating shaft (82), the extruding sheet (93) is embedded in the communicating groove in a sliding way, an extending sheet (94) which penetrates through the abutting sheet (92) extends from one end of the pressing sheets (93) which is opposite to the other end, and a guide surface (931) which pushes the abutting piece (92) to slide away from the V-shaped groove (84) is arranged between the extending piece (94) and the pressing piece (93), a thrust spring (95) for pushing the extrusion sheet (93) to move relatively is arranged in the clamping piece (9), a supporting spring (96) which pushes the abutting piece (92) to move towards the V-shaped groove (84) is arranged in the clamping piece (9), and a force bearing surface (932) which is in sliding and abutting joint with the bar stock is arranged on one side, facing the feeding slide rail (6), of the extrusion sheet (93).

2. A bar cutting apparatus according to claim 1, wherein: the feeding unit is still including setting up feeder hopper (4) in pay-off slide rail (6) width direction one side, feeder hopper (4) include backup pad (42) to pay-off slide rail (6) direction slope and be located striker plate (43) between pay-off slide rail (6) and backup pad (42), striker plate (43) extend along vertical direction and set up, striker plate (43) are provided with guide board (46) towards one side of pay-off slide rail (6), the one end that striker plate (43) were kept away from in guide board (46) extends to on pay-off slide rail (6), striker plate (43) slide along vertical direction towards one side of backup pad (42) and are provided with scraping wings (44), the upper end of scraping wings (44) is provided with the inclined plane parallel with backup pad (42).

3. A bar cutting apparatus according to claim 2, wherein: the device is characterized in that a blocking plate (52) which ascends and descends along the vertical direction is arranged above the guide plate (46) and on one side close to the feeding slide rail (6), the lower end of the blocking plate (52) is matched with the guide plate (46) to block a bar stock to roll along the guide plate (46), and the blocking plate (52) and the material pushing plate (44) are arranged in the opposite sliding direction.

4. A bar cutting apparatus according to claim 1, wherein: install transfer cylinder (7) that the drive shifted seat (8) on frame (1), the downside that holder (9) relative one end just is located storage channel (91) is provided with pressure sensor (11), pressure sensor (11): for receiving the pressure signal and starting the extension of the piston rod of the transfer cylinder (7).