The present invention relates to a kind of forcing press, particularly the forcing press of two driven by motor main shafts.
Existing forcing press is seen Fig. 2, generally comprise: a main shaft, two eccentric blocks, a flywheel, a clutch, a motor, flywheel, clutch and motor are positioned at a side of main shaft, the motor-driven flywheel, effect by clutch drives the main shaft rotation, main shaft moves up and down by the effect driving slide block of two eccentric blocks, when main shaft rotated, application point and forcing press that clutch acts on main shaft arrived away from the distance between the point of application of that end of flywheel less than this application point near the distance between the point of application of that end of flywheel like this.
A this motor-driven forcing press, because main shaft is an elastomer, the torsional interaction of flywheel causes two point of applications to have phase difference in two point of applications, produces hysteresis, and the distance between two point of applications is big more, and it is serious more to produce hysteresis.Suppose that main shaft is with direction rotation as shown in Figure 2, flywheel is on the right side of main shaft, the moment of torsion that transmits is T1, and wheel action is respectively a and b in two point of application 5a of the application point of main shaft and forcing press and the distance of 5b, as shown in Figure 2, a＜b as seen from the figure, in addition also because main shaft is an elastomer, so when the moment of torsion of flywheel was delivered to two point of applications, two point of applications can produce certain phase difference, shown in Fig. 2 a and 2b view, slide block tilt phenomenon will occur when motion like this.
As known from the above, when slide block drops to bottom dead centre, because a＜b and main shaft are elastomers, so the moment of torsion of flywheel is delivered to two eccentric block 5a and 5b, make eccentric block 5a arrive bottom dead centre earlier, arrive bottom dead centre behind the eccentric block 5b, as the right views of Fig. 2 a, when the eccentric block 5a of heavy line arrives bottom dead centre, the eccentric block 5b of fine line is also at shown position, and the no show bottom dead centre, two eccentric blocks produce phase difference α, and just slide block the right arrives bottom dead centre earlier, and arrive bottom dead centre behind the left side, the slider tilt phenomenon will appear like this, the situation shown in Fig. 2 a, and 7 pairs of guide rails 6 of slide block and 12 produce F1 and two power of F2 like this.
When slide block rises to top dead-centre, it is same because a＜b and main shaft are elastomers, the moment of torsion of flywheel is delivered to two eccentric block 5a and 5b, make eccentric block 5a arrive top dead-centre earlier, arrive top dead-centre behind the eccentric block 5b, right views as Fig. 2 b, when the eccentric block 5a of heavy line arrived top dead-centre, the eccentric block 5b of fine line was also at shown position, and the no show top dead-centre, two eccentric blocks also produce phase difference α, just slide block the right arrives top dead-centre earlier, and arrives top dead-centre behind the left side, the slider tilt phenomenon occurs, situation shown in Fig. 2 b, same 7 pairs of guide rails 6 of slide block and 12 also produce F1 and two power of F2.
To F1 that guide rail produced and the power of F2, increased the wearing and tearing of guide rail, make guiding accuracy reduce, thereby influence the precision of workpiece that slider tilt makes forcing press bear unbalance loading, influences the service life of other moving component and forcing press and mould.Owing to slide block occurs tilting, big to the friction change of guide rail, the infringement of build-up of pressure machine and mould, the while has also been reduced the precision of product.
When the left side of flywheel at main shaft, also top situation can appear.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of forcing press for the defective of improving above forcing press existence, it adopts two flywheels, two clutches to be installed in the both sides of main shaft respectively, utilization is positioned at two motors while drive shaft of main shaft both sides, slide block is risen simultaneously or descend, and tilt phenomenon can not occur.
The present invention solves the problems of the technologies described above the technical scheme that is adopted:
A kind of forcing press, it comprises: a main shaft, two eccentric blocks, driver, first flywheel and second flywheel, first clutch and second clutch, first flywheel and first clutch are positioned at main shaft one side, second flywheel and second clutch are positioned at the main shaft opposite side, driver drives two flywheels simultaneously and rotates, two flywheels pass through main shaft rotation of effect drive of two clutches, two eccentric blocks are installed on the main shaft, main shaft moves up and down by the effect driving slide block of two eccentric blocks, thereby the patrix that drives the forcing press mould that is installed in the slide block baseplane pumps.
Described driver has two, is hydraulic motor or electro-motor.
Described driver is in flywheel one side that it drove.
Described two eccentric blocks are separately respectively near first flywheel and second flywheel.
Distance between described first flywheel and adjacent eccentric block and second flywheel equate with distance between adjacent eccentric block.
Compared with prior art, the invention has the advantages that:
Adopt two flywheels, two clutches respectively in the both sides of main shaft, drive same main shaft simultaneously, the main shaft two ends are all stressed, two flywheels equate respectively with distance between two point of applications, the motion phase of such two eccentric blocks is just identical, make two point of applications of main shaft can not produce phase difference, just can rise or descend simultaneously in the slide block both sides like this, and tilt phenomenon can not occur.
Description of drawings
Fig. 1 is the structural representation of embodiment of the invention forcing press.
Fig. 2 is the kinematic sketch of existing principal axis of pressing machine and two point of applications.
Fig. 3 is the kinematic sketch of principal axis of pressing machine of the present invention and two point of applications.
The specific embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
Forcing press as shown in Figure 1, comprise a fuselage 10, working plate 11 is installed in the fuselage 10, the counterdie 9 of forcing press mould is installed on the working plate 11, two eccentric block 5a and 5b are installed in respectively on the main shaft 4, and slide block 7 is connected with main shaft 4 with 5b by two eccentric block 5a, and the patrix 8 of forcing press mould is installed on the baseplane of slide block 7, relative with counterdie 9, by the processing of slide block workpiece between the reciprocating motion between top dead-centre and the bottom dead centre is finished upper die and lower die.
The first motor 1a and the second motor 1b are installed in fuselage 10 tops respectively, two motor pulley 13a and 13b are installed in respectively on two motor transmission shafts, by belt 14a and 14b respectively with main shaft on the first flywheel 2a that installs be connected with the second flywheel 2b, first clutch 3a is connected with two flywheels respectively with second clutch 3b, also be connected simultaneously with main shaft 4, the first motor 1a and the second motor 1b, the first flywheel 2a and the second flywheel 2b and first clutch 3a and second clutch 3b lay respectively at the both sides of main shaft 4, as shown in Figure 1.
When operation, the first motor 1a drive pulley 13a, by the belt 14a transmission first flywheel 2a, first flywheel is by the effect drive shaft 4 of first clutch 3a, meanwhile, the second motor 1b drive pulley 13b, by the belt 14b transmission second flywheel 2b, the second flywheel 2b also drives same main shaft 4 by the effect of second clutch 3b, and then the effect of two eccentric block 5a and 5b by forcing press, two eccentric block 5a and 5b pass motion to slide block 7 as two point of applications of forcing press, and slide block 7 is pumped in fuselage guide rail 6 and 12, pump and finish the press work of workpiece thereby drive patrix 8.
This forcing press is to drive a main shaft simultaneously with two motors, and the moment of torsion of flywheel is delivered to two point of applications of forcing press, can not produce phase difference between two point of applications.Suppose that main shaft is with direction rotation as shown in Figure 3, the moment of torsion that flywheel 2a transmits is T1, the moment of torsion that flywheel 2b transmits is T2, flywheel 2a acts on the application point of main shaft and the distance of forcing press first point of application 5a is a1, flywheel 2b acts on the application point of main shaft and the distance of forcing press second point of application 5b is a2, because T1=T2, a1=a2, when the moment of torsion of flywheel transmission arrives two point of applications like this, two point of applications can not produce phase difference, hysteresis occurs, slide block tilt phenomenon can not occur yet when motion.
When slide block dropped to bottom dead centre, two eccentric blocks arrived bottom dead centre simultaneously, and as shown in Figure 3, slide block tilt phenomenon can not occur.When slide block rose the arrival top dead-centre, two eccentric blocks also arrive top dead-centre simultaneously, and were not shown in the figures equally.