DE2623518A1 - ROTATING SHEARS FOR CUTTING HIGH SPEED ROLLED MATERIAL - Google Patents

Description

DEMAG Aktiengesellschaft ^ May 20, 197 &

Wolfgang-Reuter-Platz 5824

41 Duisburg

Rotating shears for cutting rolling stock moving at high speed

The main patent (patent application P 24 56 431.6-14)

refers to rotating scissors for cutting rolling stock running at high speed, e.g. B. wire, with rotating at about rolling speed Material guides arranged displaceably Knives that are moved out of their rest position into the cutting position for the cut and moved back after the cut and come to a standstill in the starting position, as a shift drive for the knife in the rotating material guides arranged and rotating with these servo-hydraulically controlled piston-cylinder units are provided.

With the proposed scissors, the problem is solved, the incoming at a much higher speed than before Cutting the shear material cleanly, precisely and reliably by keeping the moving masses low and by servo-hydraulically controlled piston-cylinder units with servo valves arranged directly on them

5624 - Pa / We -? - May 20, 1976

262351Θ

optimally short knife movement times can be achieved will. This object is also to be achieved by the present invention.

In addition, the present invention is based on the object, the piston-cylinder units of the described To design scissors so that with it the required knife movements in the sense of the fastest possible Movement of the knife in the cutting position and immediately thereafter back to the rest position fulfilled can be, whereby emphasis is placed on low wear of the moving parts.

To achieve the object, it is proposed that the piston be in two volumenve.ränderliche form of the working space Double pressurizable annular pistons that divide chambers and have piston rods sealed against the cylinder on both sides is formed and the piston stroke is limited by stops arranged outside the working space is that the confluences of the supply and discharge lines for the pressure medium in the chambers are not covered by the piston are.

Line piston-cylinder unit designed in this way has the advantage that it is arranged outside the working space Stops and the proposed stroke limitation an immediate application of the entire piston area is possible that otherwise, z. B. by a stop collar or a ring in the working chamber in the end positions the piston would be reduced in size for quick response of the piston, however, it is important to have the entire piston area available immediately. It is It is also important that the confluences of the supply and discharge lines of the pressure medium are not made smaller by the pistons, so that the working chambers can be reached as quickly as possible.

709 & 49 / O282 ofuojnm. inspected

- Pa / We - £ - May 20, 1976

According to a preferred feature of the invention, it is proposed that a ring collar is provided as a stop for the stroke limitation on at least one of the piston rods is, which is in a chamber dimensioned according to the working stroke of the piston with its end faces can be placed against the end walls of the chamber.

At the very high speeds with corresponding acceleration and deceleration on a short stroke, the Movement of the piston can be safely and permanently intercepted. The proposed solution enables that Formation of a large stop surface and thus the distribution of the forces that occur over a large area the resulting low wing loading.

according to a further advantageous feature of the invention suggested that the ring collar of the piston rod in the manner of a piston in the under atmospheric pressure standing chamber and is sealed against it in such a way that the pressure reduction during the working stroke of the Piston in the chamber compressed air forming a cushioning cushion takes place with a delay.

In this way, it is very easy to dampen the strong impacts with the help of the stops provided achieve without additional attenuators provided Need to become.

An embodiment of the invention is shown in the drawing shown.

The piston-cylinder unit is designated by Λ , which consists of the cylinder housing part 2 and the piston which can be displaced therein. The piston 3 is designed as an annular piston which provides piston rods 6 on both sides. The working space of the cylinder is divided by the piston 3 into two chambers 4 and into which the pressure medium is introduced through the lines 7. The piston 3 is limited in its stroke so that the junctions 7a and 7b of the lines 7 in the

709849/0282

5824 - Pa / We - ^ - May 20, 1976

End positions of the piston 3 are not covered. In the drawing, an end position of the piston 3 is shown, the other end position is also shown in dashed lines.

To limit the piston stroke, the piston rod 6 is provided with a ring collar 8 outside the working space, which in a chamber 11 ui "is the amount of the piston stroke is movable. The ring collar 8 lies with its end face in one end position of the piston 8b to the end wall 10 of the chamber, in its other end position with the end face 6a to the end wall 9 of the Chamber and thus limits the stroke.

through the junction 7 a of the line .7 a pressure medium guided by the servo valve, not shown, into the chamber 4, ao the piston 3 moves at high speed in the position shown in dashed lines. Like the piston 3 on the piston rod 6, the ßing-collar makes this movement in the chamber 11 with, the one in the chamber 11 being under atmospheric pressure Air is compressed and thus damping before the end face 8a hits the end wall 9 of the chamber causes. The sealing of the ring collar 8 is chosen so that the air can escape past the ring collar, this so only acts as a dampening agent. By 'that the junctions 7a and 7b are not covered by the piston 3 and because the stops 8a, 8b of the piston 3 are located outside the working chambers, it is possible that immediately the entire annular surface of the piston 3 acted upon with pressure medium will. In this way, the piston 3i can be moved very quickly both in the working position and in the rest position possible, the knife being arranged at one of the free ends of the piston rod 6.

The plate labeled 12 in the drawing is a wearing part thought and can be exchanged.

709949/0282

Claims (3)

- Pa / We - jf - 20th quay 19--6 262351a Claims Listing scissors for cutting with. high speed rolling stock, e.g. B. wire, with rotating, rotating material guides which are displaceably arranged, which are moved out of their initial position in the cutting position for the cut and are moved back after the cut and come back to the starting position, where a! Is a displacement drive for The Hesser can be arranged in rotating material feelers and with these rotating servo-ij.ydiaulically controlled Koiben cylinder units are provided (according to iratent latent anmelcung i- Z ^ 'jO 4 ^ 1.6-14 ;, characterized, that the piston (3; as a working space in two volume-variable jvammex-n (A, ^) under part end ei double pressurizable liing piston with bilateral piston sealed against the cylinder (? j refueling (6;) and the piston stroke through outside the The stops (, ba, bb, 9 and 10) arranged in the working space are limited in such a way that the linings (7a, 7 & J of the inlet and outlet lines C / J for the pressure medium in the working chambers (4, ^ j c by the piston {Z) are not covered are. ^ßAD ί> 824 - Pa / we - ßf - May 20, 1976 2. doping scissors according to claim 1, characterized in that that as a stop (.8a, Ob; for the stroke limitation an iting collar (8) is provided on at least one of the piston rods (6), which in a corresponding the working stroke of the piston (3) dimensioned chamber (11) with its end faces the end walls (9, 10) of the chamber (11) can be placed. 3 .. listing scissors according to claim 1 and 2, characterized in that that the ring collar (8; the piston rod (6; in the Type of a piston in the chamber under atmospheric pressure (11 j guided and against this is sealed in such a way that the pressure reduction of the compressed during the working stroke of the piston (3; in the chamber (11), air forming a cushioning cushion takes place with a delay. 709849/028?