CN2228816Y - Stock support mechanism for bar stock clipping machine - Google Patents

Abstract

The utility model relates to a stock support mechanism for bar stock cutting machines, which comprises an oscillating oil cylinder which has fulcra which are all arranged on a shears arm, a support lever which has a stock support head arranged on the front end, and a pair of upper shears which is in alignment with the stock support head. The back end of the support lever is connected with the front end of the piston rod of the oil cylinder by a suite of hinged toggle mechanisms (linkage levers or lever cam mechanisms). The stock support force is changed into the internal force of the shears arm by thetoggle mechanisms. The cutting force consumption is reduced, and the mechanical efficiency of the utility model is improved. The utility model has the advantages of energy saving, big support force, stable and reliable work, little component abrasion, and good processing quality.

Description

Material carrying mechanism on a kind of bar shears

The utility model relates to a kind of metal bar material punching shear mechanical.

Employed bar shears adopts machine driving straight line punching mode mostly in the current domestic and international machinery manufacturing industry, for example China Shenyang Forging Press Factory imitates the Q42 series bar shears of Japanese chestnut our company production, this machine has a very heavy fuselage, riser before and after being welded with on it, be welded with down tool rest between riser and be shaped on and supply the straight-line guide rail of cutting punch (also claiming slide block), motor drives drift by transmission system drive crankshaft rotating and carries out the punching campaign, on, down shear blade is loaded on respectively on drift and the following tool rest, bar is sent to by the rollaway type feed appliance during punching, compress by stock stop location and pneumatic eccentric eccentric swage, workpiece is parallel to be moved in order to keep in the shear history, reduce flexural deformation as far as possible, be provided with a material carrying mechanism again in the bottom of cutter, it only is a cylinder that is fixed on the fuselage usually, its piston rod upper end is fixed with a retainer head rest and lives workpiece, so, the punching shear of drift has been offset greatly by the uplift force of material carrying mechanism, not only serious waste the energy, also obviously reduced the maximum shear diameter of machine, no wonder many manufactories or user have just cancelled material carrying mechanism, like this, bar becomes to cut off to bending and fractures, cross section quality is very poor, be serpentine, end surface inclination can be up to 4 °, also strengthened error in length, not only reduced mass output rate, wasted a large amount of raw material, also strengthened allowance, the axial drag of cutter and drift workpiece generation is by bending simultaneously impacted, accelerated wear test or damage, even used the retainer device, because of cylinder dimensions and pressure are restricted, it is very big to add the compressible ratio of medium itself again, be difficult to the retainer power that provides enough and stable, make and shear the workpiece cross section quality and can not get guaranteeing at all.

Task of the present utility model provides the material carrying mechanism on a kind of bar shears, and should guarantee to have enough retainer power and rigidity and effectively improve nominal shearing and the workpiece cross section quality and the precision of machine, and mass output rate, but energy savings also simultaneously.

The design of finishing above-mentioned task is material carrying mechanism all to be fixed on together with its power source the cutting on the arm (being equivalent to drift) of scissors is housed, this material carrying mechanism comprises that fulcrum all is located at oscillating oil cylinder and the Tuo Li lever of cutting on the arm, the front end of holder power lever is equipped with a retainer head that aligns with last scissors, between the rear end of holder power lever and the front end of oil cylinder piston bar, connect with a cover force-increasing mechanism, connected mode has two kinds, a kind of is the lever interlock force-increasing mechanism that adopts hinge joint, another kind is to use the lever cam force-increasing mechanism of hinge joint, be that the fulcrum of lever is located at and cuts on the arm, the upper end of lever and the hinge joint of piston rod front end, the lower end of lever is made cam curve and is pressed in the rear end of holder power lever.

Bar is sent to by feed appliance during work, after stock stop location and eccentric swage compress, cutting arm moves downward when making a cutter near workpiece, the oil cylinder piston bar of material carrying mechanism protracts, to ask the power lever rear end to pressing down by force-increasing mechanism, then the retainer head of its front end promptly upwards is close on workpiece, be actually with last scissors workpiece locking is embraced, and move downward synchronously with cutting arm, the corresponding counter-force balance of retainer power here and cutter becomes cuts arm internal force, passes to the shearing force of cutting arm with transmission system and has nothing to do, thereby improved the complete machine mechanical efficiency, reduce energy consumption and enlarged the machine works scope, promptly improved machine nominal shearing.Again because the utility model has secondary force-increasing mechanism (lever or cam) at least, and the compression ratio of oil cylinder working media own is minimum, can adopt hydraulic oil again, fuel feeding adopts the unidirectional blocking formula, so the retainer head can obtain enough rigidity and support force stably, workpiece is cut off in pure shear, not only improved the dimensional accuracy of workpiece and cross section quality and also made parts be subjected to horizontal drag less and alleviate wearing and tearing, prolonged service life of a machine.

The embodiment that provides below in conjunction with accompanying drawing is replenished description to the utility model.

Fig. 1 is the material carrying mechanism sketch when adopting linkage lever mechanism to make force-increasing mechanism;

Fig. 2 is the material carrying mechanism sketch when adopting lever and cam as force-increasing mechanism.

Arrive as seen from Figure 1, the support 1 of bar shears and fulcrum 2 swings that can be on support cut arm 4, material carrying mechanism comprises that fulcrum all is located at oscillating oil cylinder 5 and the Tuo Li lever of cutting on the arm 8, the front end of holder power lever is equipped with retainer head 3, the piston rod front end of oil cylinder 5 and lever 6 hinge joints connect with the rear end strand of connecting rod 7 with lever 6 and Tuo Li lever 8 again.For making more compact structure, lever 6 can be made into triangle.For further reinforcement, connecting rod 7 also can be designed to lever.

By the shape that Fig. 2 can show lever and cam in second kind of force-increasing mechanism, these lever 9 fulcrums are located to be cut on the arm 4, lever upper end and piston rod twisted joint, and the lever lower end is made cam 10 and is pressed in the rear end of holder power lever 8.Change part for the ease of the optimum distance of adjusting different size workpiece and retainer head 3 with being convenient to wear and tear, lever 9 lower ends are preferably made and be fixed on to this cam 10 separately.For mechanism weares and teares with reducing flexibly, holder power lever rear end preferably is equipped with roller 11, and the curve of cam 10 is pressed on this roller 11.In addition, for increasing work efficiency and strengthening force increasing ratio, cam curve is preferably made more than two sections or two sections, and first section curve lift angle is bigger, realizes the quick convergence workpiece of retainer head, and later curve lift angle reduces piecemeal to improve force increasing ratio.

Claims (5)

1, the material carrying mechanism on a kind of bar shears, it is characterized in that this mechanism comprises that fulcrum all is located at oscillating oil cylinder (5) and the holder power lever of cutting on the arm (4) (8), the front end of holder power lever is equipped with a retainer head (3) that aligns with last scissors, is connected with (7) with the lever that the links force-increasing mechanism (6) that links between the rear end of holder power lever and the front end of oil cylinder piston bar.

2, material carrying mechanism according to claim 1 is characterized in that in the said hinge joint lever interlock force-increasing mechanism triangular in shape with the lever (6) of piston rod twisted joint.

3, the material carrying mechanism on a kind of bar shears, it is characterized in that this mechanism comprises that fulcrum all is located at oscillating oil cylinder (5) and the holder power lever of cutting on the arm (4) (8), the front end of holder power lever is equipped with a retainer head (3) that aligns with last scissors, lever cam force-increasing mechanism (9) with hinge joint between the rear end of holder power lever and the front end of oil cylinder piston bar is connected with (10), be that the fulcrum of lever (9) is located at and cuts on the arm (4), the upper end of lever and the hinge joint of piston rod front end, the lower end of lever is made cam curve (10) and is pressed in the rear end of holder power lever (8).

4, material carrying mechanism according to claim 3, it is characterized in that the cam (10) in the said hinge joint lever cam force-increasing mechanism is to make and be fixed on lever (9) lower end separately, roller (11) is equipped with in holder power lever (8) rear end, and the curve of cam (10) is pressed on this roller.

5, according to claim 3 or 4 described material carrying mechanisms, it is characterized in that the curve on the said cam (10) has two sections at least, wherein first section curve lift angle is bigger, and later curve lift angle reduces piecemeal.