RU2419545C2 - Crank-operated press overload protection device - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to press forging equipment and may be used in crank-operated presses to protect them against overloads. Press slide block is provided with groove receiving rod support to make a space between groove bottom and support. Overload protection device comprises rod with roller pivoted therewith, master cam in contact with said roller and ball. Compression springs are arranged in aforesaid space between slide block bottom and rod support. Ball enters the groove made in rod support to be pressed by rod via stack of plate springs.

EFFECT: longer life and efficient operation.

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Description

The invention relates to forging and mechanical engineering and can be used to protect against overloads of crank presses.

A device is known for protecting against overloads of a press with a double-stand type bed, comprising a sleeve with a flange mounted in a bore of a slider, in which a connecting rod support is mounted, wherein cavities and protrusions are made on the sleeve flange and the connecting rod cover, and the sleeve flange protrusion, the flange bushings mounted on a slider with a pin and a spring, the flange fastening pin is made with a groove, which includes a ball pressed by a spring located in the radial hole of the flange interacting counter on the left side with a rod with a roller pivotally attached to its end in contact with the copier, an adjustable flange stop is made in the bed, and the cavity between the connecting rod support and the bottom of the slide of the slide is filled with a high viscosity fluid.

The disadvantages of this device are the design complexity and the likelihood of leakage of the working fluid from the cavity between the connecting rod support and the bottom of the slide of the slider.

The claimed invention solves the problem of increasing the durability and efficiency of the device by simplifying the design and eliminating the need for the use of a working fluid.

This is achieved by the fact that the device for overload protection of the crank press, the slider of which is made with a bore, in which the connecting rod support is mounted, comprising a rod with a roller pivotally mounted at its end, a copier located in contact with the said roller, and a ball, while supporting the connecting rod is mounted in the bore of the slider with the formation of a cavity between the bottom of the bore and the support, unlike the prototype is equipped with compression springs installed in the cavity between the bottom of the bore of the slide and the support of the connecting rod, and the latter is made with a can Application Serial, which includes a ball-urging pack of disc springs, which have the ability to interact with the second side of the stem.

The invention is illustrated in the drawing, which shows a section of a safety device.

A support 2 of the connecting rod 3 is placed in the bore of the slider 1. The support 2 is made with a groove interacting with the ball 4 (or a roller, with one or two on both sides of the slide), which is pressed with the necessary force by the rod 5 through the disk spring package 6. On the protruding from the slider, the end of the rod 5 is pivotally fixed to the roller 7 in contact with the copier 8. The compression springs 10 are inserted in the cavity 9 formed in the slider between the connecting rod support and the bottom of the bore.

The device operates as follows.

When an overload occurs, the slider 1 stops, and the support 2 with the connecting rod 3 moves downward, moving the ball 4 with the groove and squeezing the disk spring package 6 to the required force, so that the ball 4 comes out of the groove and starts to contact the cylindrical surface of the support 2. Then the support 2 of the connecting rod 3 falls down to its lowest position, compressing the springs 10, the crank shaft rotates, and all press mechanisms are protected from overload.

In the case when the overload occurs when the slider 1 is less profitable to its lowest position than the nominal profit, the roller 7 is not in contact with the straight, but with the curvilinear section of the copier profile 8, moving forward with the rod 5. Compression of the spring pack 6 decreases, reducing the locking force of the ball 4 of the support 2 and, therefore, the actuation force of the safety device to a value corresponding to the force allowed on the slider 1 at this value of non-profit.

When the slider 1 moves upwards due to the energy of the press drive, the compression springs 10 return the support 2 of the connecting rod 3 to their original position so that the ball 4 fits into the groove of the support 2. Thus, the safety device restores its working state.

This device allows to increase the durability and efficiency of the device by simplifying the design and eliminating the need for the use of a working fluid.

Information sources

1. N.V. Petrov, N.V. Leonova, N.P. Katkov. Device for protecting the press from overloads. RF patent 2304514 C1, B30B 15/28, 08.20.2007. Bull. Number 23.

Claims (1)

A device for protecting against overloads of the crank press, the slider of which is made with a bore, in which the connecting rod support is mounted with the formation of a cavity between the bottom of the bore and the support, containing a rod with a roller pivotally mounted on its end, a copier located in contact with the said roller, and a ball, characterized in that it is equipped with compression springs installed in the cavity between the bottom of the bore of the slider and the support of the connecting rod, and the latter is made with a groove in which the ball enters, pressed by a packet of Belleville springs, which e opposite side interact with the stem.

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