RU2283233C1 - Drive for slide of mechanical press - Google Patents

Abstract

FIELD: mechanical engineering.

SUBSTANCE: drive comprises driving crankshaft with flywheel, connecting rod of the driving crankshaft pivotally connected with the driving crankshaft, additional connecting rod pivotally connected with the connecting rod of the driving crankshaft, crankshaft of the additional connecting rod pivotally connected with the additional connecting rod, clutch, and flywheel. The drive additionally has locator of the slide and crankshaft of the slide pivotally connected with the slide. The crankshaft of the slide is pivotally connected with the connecting rod of the driving crankshaft and additional connecting rod. The lengths of the radii of the cranks of all crankshafts are equal.

EFFECT: enhanced reliability.

4 dwg

Description

The invention relates to the field of forging press engineering and can be used in the design of the press drive.

The known design [1] of the drive of the slider with an adjustable radius of the crank mechanism, containing two crank shafts with eccentric bushings, each placed in the frame supports, mounted on the crank shafts of the flywheel, connected by gears to the corresponding gears, a reducer mounted on the bed with a carrier, the main and auxiliary electric motors associated with the press electrical system and the corresponding flywheels and articulated with a connecting rod slider, while the main electric motor is connected to one of crankshafts, the shaft is equipped with an additional connecting rod, traverse, additional bearings in the frame for placing the crank shafts, a rotary angle adjuster of the crank shaft, a rotational angle indicator of the carrier, an adjuster of the rotational angle of the carrier, a sensor for monitoring the extreme working position of the slider are attached to it a device for monitoring the extreme working position of the slider with a functional converter.

The disadvantage of this design is the increased complexity associated with the introduction of an intermediate traverse.

Closest to the claimed combination of essential features is a mechanical press slide drive [2] containing a crank shaft articulated with a connecting rod, two flywheels connected by gears to the corresponding gears of the differential gear mounted on the frame with a locking unit, the main and auxiliary electric motors associated with the electrical system the press and the corresponding flywheels, as well as couplings and brakes, while in order to increase reliability and expand technological capabilities Due to in-cycle regulation and control of the technological effort, speed and stroke of the slide, the ECA is equipped with an additional crank shaft with a brake coaxially with the main crank shaft, two eccentric bushings, sensors for monitoring the technological force, the speed and stroke of the slider and the position of the additional crank shaft, as well as a control unit associated with the aforementioned sensors and by means of the electrical system - with an auxiliary electric motor, eccentric bushings are located in and connected to the cranks of the said shafts, while the input of the differential gearbox is connected to the main electric motor.

Thus, the device [2] comprises a drive crank shaft equipped with a flywheel, a connecting rod of the drive crank shaft, pivotally connected to the drive crank shaft, a connecting rod pivotally connected to the connecting rod of the drive crank shaft, a crank shaft of the connecting rod, pivotally connected to the hooked rod clutch and flywheel.

The disadvantage of this device is that the closed height of the die space is reduced in comparison with conventional crank presses by about two lengths of cranks due to the kinematically required location of the top dead center (TDC); eccentric bushings are located cantilever, which leads to distortions in the hinges under load; as well as the fact that there is a need for two electric drives of crank shafts and the need for a power device to turn on the drive on the slide.

The invention is aimed at eliminating these disadvantages.

This is achieved by the fact that in the drive of the slider of the mechanical press containing the drive crank shaft, equipped with a flywheel, the connecting rod of the drive crank shaft, which is pivotally connected to the drive crank shaft, the connecting rod, which is pivotally connected to the connecting rod of the drive crank shaft, the crank shaft of the trailer connecting rod, pivotally connected to a hook-on connecting rod and equipped with a clutch and a flywheel, while the drive further comprises a slider lock and a slider crank shaft, which is pivotally connected to the slider, etc. and this crank shaft of the slider is connected with coaxial joints with the connecting rod of the drive crank shaft and the connecting rod, and the lengths of the radii of the cranks of all the crank shafts are equal to each other.

The achievement of the technical result is due to the presence of the crank shaft of the slider connected to two connecting rods.

The invention is illustrated by drawings, in which Fig. 1 shows the kinematic diagram of the press, Fig. 2 shows the position of the slider in the standing position, Fig. 3 shows the position of the slider in the mode of protecting the press from overload by force, and Fig. 4 shows the clamp of the slider in hydraulic version.

The press slider drive contains:

a crank drive shaft 1 provided with a flywheel 2; connecting rod of the drive crank shaft 3; trailed connecting rod 4, pivotally connected to the connecting rod of the drive crank shaft 3; the crank shaft 5 of the trailer connecting rod, equipped with a clutch 6 and a flywheel 7; the crank shaft of the slider 8, pivotally connected to the slider, connected by another hinge to the connecting rods of the drive crank shaft and the crank shaft of the trailer connecting rod, coaxial with the hinge connecting these rods; the slide of the slide containing the controlled valve 9, the hydraulic cylinder 10, the safety valve 11, the throttle 12 and the compensator for leakage of fluid 13.

The lengths of the radii of the cranks of the crank shafts 1, 5 and 8 are made equal to each other.

The drive operates as follows.

The slider stand-up mode at TDC is ensured by synchronous rotation of the flywheels 2, 7 due to synchronous-in-phase rotation of the crank shafts 1, 5, 8, the mutual arrangement (in-phase) of which is ensured by the equal lengths of the radii of the cranks and shown in Fig. 2.

The mode of protecting the press from overload by force on the slider in the specified range of the working stroke from the bottom dead center (BDC). The principle of operation of the drive during hard impact is shown in Fig.3.

In this position, the crank shaft of the slider 8 under the action of the connecting rod of the drive crank shaft 1 and the trailer connecting rod 4 has the ability to rotate about its axis in the direction of the arrow. The magnitude of the force acting on the slider is determined by the flywheel masses of the drive, their angular accelerations. Therefore, the magnitude of the maximum force on the slider within the permissible limits can be structurally limited.

In the mode of turning on the drive to the working stroke of the slider in a predetermined position of the drive crank shaft 1 is provided by accelerating the rotation of the latter.

In the fixing mode, the position of the slider in the jogging mode when adjusting the stamp is provided by the clamp of the slider associated with it. A variant of the hydraulic device is shown in FIG. In this device, a controlled crane 9 either communicates with each other the cavity of the hydraulic cylinder 10 for the free movement of the slider, or disconnects the cavity to stop it.

In the single-stroke mode of the slider, the position and condition of the drive elements are as follows:

the slider is located at the TDC, the flywheels 2, 7 rotate, the clutch 6 is turned on, the slide lock is turned off, the flywheel 2 is accelerated in the given angular position of the crank shaft 1, the slider moves to the BDC, the drive performs technological work by moving the slider in the stamp to the stop, kinematic links bring the slider from the position of the spread of the mechanism and move it to the TDC, the slide lock 9 is on.

In idle mode (without a stamp) of a single stroke of the slider, the position and condition of the drive elements are as follows:

the slider is at TDC, the flywheels 2, 7 rotate, the clutch 6 is turned on, the lock of the slider 9 is turned off, the flywheel 2 is accelerated in the predetermined angular position of the crank shaft 1, the slider moves to the BDC, the kinematic links move the slider from the BDC position and move it to the TDC, lock Slider 9 is included.

When operating in continuous mode, the position and condition of the drive elements are as follows:

the slider is at TDC, the handwheels 2, 7 rotate, the clutch 6 is turned on, the lock of the slider 9 is turned off, the flywheel 2 is accelerated in the predetermined angular position of the crank shaft 1, the slider moves to the BDC, the drive performs technological work by moving the slider in the die to the stop, the slider moves towards TDC.

The advantage of the drive is that it ensures compliance with current Russian and foreign standards for the functions of mechanical presses and safety measures.

Information sources

1. A.S. USSR No. 1638028 / G.P. Bolshakov, I.A. Remikh, N.Ya. Yuryev - Method for controlling the drive of a press ram with an adjustable radius of the crank mechanism and the drive of a press ram with an adjustable radius of the crank mechanism. / Publ. BI No. 12, 1991, B 30 V 15/14.

2. A.c. USSR No. 1442427 / G.P. Bolshakov, I.A. Remikh - drive of a slider of a mechanical press. / Publ. BI 45, 1988, 30 V 15/28.

Claims (1)

A slider drive of a mechanical press, comprising a drive crank shaft with a flywheel, a connecting rod of the drive crank shaft, pivotally connected to the drive crank shaft, a connecting rod, pivotally connected to the connecting rod of the drive crank shaft, the crank shaft of the connecting rod, pivotally connected to the coupling rod and provided with a connecting rod and flywheel, characterized in that it is additionally equipped with a slider lock and a slider crank shaft pivotally connected to the slider and by means of coaxial joints with a connecting rod one crank shaft and a trailed connecting rod, and the lengths of the radii of the cranks of all the crank shafts are equal to each other.

Images