RU1834812C - Safety device on power force - Google Patents

Description

The invention relates to the processing of metals by pressure, and in particular to safety devices for mechanical presses,

The basis of the invention is the creation of a force fuse for mechanical presses, the design of which would not only be simpler, but also reliable in operation, and would also provide an extension of the range of regulation of the power parameters of the fuse.

The proposed design is simpler and the worst of the prototype, it allows minimizing the number of interacting assembly units and performing them with a sufficient margin of safety, as well as simplifying the assembly and adjustment process. At the same time, the placement of the said elastic element made in in the form of a steel cup with slots on the tank surface, in the cavity of the slider with a gap, the presence of a support ring mounted with the possibility of vertical movement on the protrusions of the figured disk, passed through the slots on the side surface the spine of the cup and the disk mounted on the drive rod passing through the bottom of the cup, allows you to move the support ring over the entire height of the cup and thus in a fairly wide range to set the required stiffness of the elastic element and the corresponding actuation force of the fuse without compromising its reliability and complicating the design .

Thus, it is possible to avoid the restriction of adjustment that occurs when using traditional elastic elements - Belleville, coil and other springs, which have a narrow range of either draft or compression forces, and as a result predetermine the increased dimensions of the fuses and their unreliable work.

Figure 1 shows a cutaway fuse built into the actuator of a mechanical press; figure 2 is a section aa in figure 1.

An elastic element made in the form of a steel cup 3 with slots 4 on the side surface is built into a cavity with a cylindrical lateral surface of the slider 1 moving in the guides 2. The bottom part 5 of the cup 3 abuts against the bottom 6 of the cavity of the slider 1. The upper end 7 of the cup 3 having a tapered bevel abuts against the counter surface 8 of the drive joint 9 fixed by a nut 10 in the upper part of the cavity of the slider 1 and connected through the earring 11 and the stud 12 with lead. general lever 13 of the actuator. In the diametrical gap 14 between the side walls of the cavity of the slider 1 and the cup 3, there is a support ring 15, mounted on the protrusions 16 of the figured disc 17, passed through the slots 4 on the side surface of the cup 3. The figured disc 17 is fixed with a split washer 18 on the drive rod 19, passing through the bottom of StakiaZ.

The fuse operates as follows.

To adjust the fuse to the required actuation force. By turning 5, the rod 19 moves the bearing ring 15 located on the protrusions 16 of the figured disk 17 connected with the rod 19 in the vertical direction to the corresponding height relative to the bottom of the glass 3.

0 thereby choosing the necessary stiffness of the fuse by limiting the opening of the petals of the side surface of the cup 3 and, accordingly, the actuation force.

After the settings are made, the fuse is ready for operation. When overloaded, the fuse operates as follows.

The slider 1, not reaching the lowest position, stops, and the crank (not shown) continues to rotate, moving the drive lever 13. which transmits the movement through the studs 12 and the earring 11 to the drive joint 9. As a result of the opening 5, the petals of the glass Z. within adjusting the position of the support ring 15, thereby selecting the remainder of the travel of the drive joint 9. After passing the lowest position during reverse travel, the pre- is restored. the guard in the initial position, i.e. returning the petals to their original undisclosed state.

Example. For mechanical press

5 with a force of pH 60 kN, intended for pressing metal-powder products, in particular electrodes for micro-power supplies, a sharp increase in the force at the end of the stroke is characteristic, which is unreliable

0 fuse leads to rupture of the frame.

The proposed fuse design is designed according to the following source data.

From the condition of inscribing the existing dimensions of the cavity of the slider, the outer 00c of the cup is 56 mm and the inner 00Bn is 40 mm. The maximum length of the petals of a split glass I is 120 mm. the number of petals is n 4. The maximum stroke (opening) is 0.3 mm. Overload coefficient Kp 1.2. The taper angle / 3 must exceed the friction angle (to restore the elastic element after being triggered).

We take the friction coefficient f tg f 0.1, then / 15 °. Calculation according to well-known formulas for bending an elastic beam determines the deflections fi and h at the initial and final moments of fuse operation

fv

R-g

3 E I / 4 r-, 4

 3 F. p. 0.2

I / -. R . | 3 f2 - 0.72 MM.

0.6 mm

 0.29 mm

. ZE I

Fuse response

3 12 fU. Ml tg (/ P-) o, 42

which corresponds to the maximum stroke when pressing an electrode of powder material. With a smaller working stroke, it is possible to increase the rigidity of the fuse mechanism (which will increase the accuracy of the product) by moving the support ring and reducing the free length I of the glass petals.

The invention can be used in various industries using mechanical presses and automatic presses to increase their performance and ensure uninterrupted

press work in automated complexes and lines,

Claims (1)

SUMMARY OF THE INVENTION A mechanical press fuse comprising a cup mounted in a central limited cylindrical lateral surface of a slider cavity kinematically connected to a drive joint, an elastic member, and 10 a rod placed in the through hole of the bottom of the cup with the possibility of rotation and reciprocating movement about its axis, characterized in that. that the glass is placed with a gap 15 relative to the side surface of the cavity of the slider and is made of steel with cuts on the walls from the side of the bottom end opposite to it and with a conical bevel facing the inside of the glass 20 end, the bottom part of the glass is mated to the bottom of the cavity of the slider, the drive hinge. with a conical surface mating with the conical bevel of the glass, the elastic element is made in the form of placed 25 between the slots of the glass of the sections of its wall, and the rod (equipped with a curly disk fixed to it with protrusions located in the slot of the glass and a support ring mounted on the protrusions of the disk 30 with vertical movement in said gap. / b U5 ®ur.Ј