SU1253749A1 - Hold-down device for shears - Google Patents

Description

The invention relates to the processing of metals by pressure, namely to the design of the clamping devices of the shears for metal cutting, and can be used in the procurement of engineering enterprises in the preparation of blanks.

The aim of the invention is to increase the productivity of the device by eliminating the possibility of placing the remainder of the cut-rolled between the upper knife of the shears and the compression beam, and then reducing it. 1 abarntov and metal.

Fig, 1 shows a clamping device to the scissors, a general view; in fig. 2 - Sechena A-A in FIG. 1 (the first embodiment of the implementation is: beams by me); in fig. 3 - the same (second embodiment of the clamping beam); in fig. 4 prizhsh-pue device to but Shizami, general view (second embodiment of the implementation); Fig. 5, the same (third embodiment). I. ...

PrISh1mnoe device to scissors

contains (Fig. 1) an inclined guide 2 rigidly mounted on the scissor base 1 and placed with a movable right-angle boom 3 having a working surface 4, which is connected through the axis 5 with a thrust made in the form of plates 6 and 7 covering the pressure beam 3 from two sides and provided with a strap 8 rigidly connected with them, with which one of the blunt elastic element, for example a spring 9, is connected to one end. The second end of the spring 9 is connected to the axis. 10, rigidly mounted on the bed 1 of the scissors, below the hinge joint of the rod with pressure beam 3, i.e. below the axis 5. At that, the position of the fastening of the axis 10 on the base 1 is chosen in such a way that the force of deformation P of the spring 9 is directed in the direction of displacement of the clamping beam 3 to the working position and creates the last tilting moment relative to the axis 1I of the hinged connection two-arm driving lever 12, and therefore provides a constant contact of the pressure beam 3 with the guide 2. The position of the pin 5 on the pressure beam 3 is chosen so that the surfaces of the pressure beam 3 and the Guide 2 interacting with each other located on either side of the perpendicular to the restored to these

0 5

5 0 5

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surfaces from the center of axis 5. Such an arrangement of axis 5 excludes rotation of the clamping beam 3 around it, which, under the influence of the tilting moment created by the rod 9, is constantly in contact with guide 2.

With a thrust, through the axis 11, one shoulder of the two shoulders lever 12, mounted for rotation on the axis 13, rigidly mounted on the bed 1 of the scissors, is pivotally connected. The second shoulder of the two shoulders lever 12 interacts with the roller 14, installed on the slider 15 to the left of its swing axis 16. The pressure beam 3 is provided with a surface 19, which is mating with the pressure of the first fifth and inclined to the fixed 17 and movable 18 knives 19 (Fig. 2 and 3), which makes up the angle of the horizontal receiving table 20 and lies within (} ° {.: 90 ° - tf, where (| - is the angle of self-locking of interacting materials. - material of the COMBINED blade and the material of the workpiece, and the ratio of height II from naiveELS; the neck above the receiving table 20 points inclined towards the knives surface 19 to receiving surface

table 20 to the distance L from the highest point above the receiving stop 20 points

inclined toward the knives, the surface 19 to the upper movable knife 18 is within the arctan (p

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cutting rolled any thickness).

If the inclination angle of the guide 2 to the receptacles (at table 20 is 1 less than the angle с (the angle of self-locking of materials and materials - pressure bar 3 and guide 2), then pressure bar 3 is used, the cross section of KOTOPOII It is shown in Fig. 2. In this case, the pressure beam 3 under the influence of the ciin arising during the cutting process does not move away from the rolled 21 due to the fact that the frictional forces between the npi shim beam 3 and the guide 2 are greater than the specified forces.

The angle of inclination of the guide 2 to the receiving table 20, equal to or less than the angle cf, is possible only on scissors intended for cutting rolled products of small thickness (up to 16 mm).

- Pr11 changing this angle of inclination of the guide 2 on the scissors using

It is possible to use large thicknesses for the rental river, because, due to the small angle q (7 °), the pressure beam 3 will move more, For example, when tolling a rolled steel up to mm and inclination

ten

t5

20

a guide 2 to the receiving table 20 of 7, the stroke length of the presser beam of the beam 3 is 370 t-fM. This increases the operating time of the cutting device, and also increases its metal intensity by making a guide 2 of considerable length, corresponding to the course of the pressure beam 3.

To reduce the length of the stroke of the clamping unit 3, the guide 2 is set at an angle exceeding the angle Cf. Thus, for example, with the angle of inclination of the guide 2 to the receiving table 20 equal to 22, the stroke of the clamping beam 3 is only 120 mm.

However, in this case, the forces arising in the process of cutting and affecting the clamping pin 4 of the clamping 25 beam 3 exceed the friction forces, the return between the guide 2 and the bushing 3, as a result of which from rental 21.

In order to eliminate this drawback, pressure bar 3 is used, the cross section of which is shown in FIG. 3. B of said clamping beam 3, the presser pin (surface 4) with which the inclined surface 19 is associated is displaced relative to the longitudinal axis of symmetry of the guide 2. As a result, the forces arising during the cutting process and acting on the npj-racHMiiyra n tu { surface 4) tends to turn the beam 3 and thereby jam it in the guides 2, excluding the departure from the rolled 21.

Thus, the clamping beam 3, depicted on. 2 is simple in design, but can be used - only on scissors intended for cutting small rolled stock (up to 16 mm). Pressure beam 3, image; -kenna in FIG. 3. has a more concise structure: and is more laborious to manufacture, but can be used on scissors., Intended for cutting rolled steel of any thickness.

FIG. 4 shows a clamping device, in which the spring 9 is connected at one end with the clamping beam 3, in particular with the axis 5, fixed

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55

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The clamping beam 3, and the second end, with the axis 1.0, is fixed on the rail 2 or on the scissors base above the hinged connection of the clamp with the pressure beam 3 (i.e., axis 5). The position of the fastening of the axis 10 is chosen in such a way that one of which the deformation force P of the spring 9 is deployed is directed in the direction opposite to the direction of the force of weight Q of the cautery beam 3, and the second towards the displaced pressure beam 3 in the working position. Thus, the spring 9 ensures the constant contact of the beam 3 between me and the beam 2 with the guide 2 and the movement of the beam 3 into the working position.

 FIG. 5 shows a clamping device in which the ha ha 7 is sariirno connected by means of an axis 11 with one shoulder of the two shoulders lever 12 in its middle part. In this case, one end of the hinge is articulated, as in the described embodiments, with clamping block 3 via axis 5, and the other end of pin 9 is connected with the second arm of the double lever of which lever 12. In this case, the citna deformation of the spring beam 3 is in a working position and creates a tilting moment for it relative to axis 11, and therefore ensures constant contact of clamp beam 3 with guide 2.

The scissor hold-down device works in the following way.

35

The rental 21 is laid in bondage on the pressure table 20 and fed into the solution between the blades 17 and 18, after which the scissors drive is activated. When the working stroke of the slider 15 (sub 1: the knife 18 moves to the fixed knife 17), the roller 14 moves away from the two shoulders 12. The right beam 3 under its own weight and the power element, for example spring (Fig. 1, 4 and 5) is mixed the guide 2 to the working position for rolling 21. Together with the clamping beam 3, the vehicle moves 7, turning clockwise on the axis 13 of the two shoulders 12, one arm of which is pivotally connected to the rod 1 by means of the axis 11. As a result of this rotation of the two shoulders his second shoulder constantly interacts with roller 14. Moving to work

position, the pressure beam 3 first acts on the rolling stock 21, evenly distributing it on the receiving table 20, along the fixed 17, then pressing the rolling 21 by the pressure pin (surface 4) on the table 20.

After the end of the cut, the slider 15 reverses, with the roller 14, acting on the double-arm lever 12, turns it on the axis 13 counterclockwise, overcoming the resistance of the strength element - spring 9 and the weight of the pressure beam 3. In the course of its rotation, the double-arm lever 12 moves in the opposite direction from 7 to 7 sec with an ismnaja beam 3 releasing the cat 21. Next, the car 21 is again fed into the solution between the blades 17 and 18.

The operation of all variants of the scissor clamping device shown in FIGS. 1, 4 and 5 is completely similar to that described. The difference between these options in the implementation and fixing of the power element, which are caused by the design features of the scissors, on which the clamping device is used.

On an inclined surface area 19, if the residue is in contact with it

of the rolled metal, there are no conditions for jamming, since the remainder of the rolled metal is always free of movement (movement from the inclined surface 19 to

reception table 20), and if the remainder occupies the position shown in FIG. 2 and 3 dash-dotted & g lines, then, since in this case the angle of inclination of the remainder of the rolled stock

the greater the angle if,. and according to the operating conditions of all the clamping devices, they first press the rolled steel, and then the movable knife 18 fits the car, and in the above case

First, the knife 18 is freed from the remainder of the rolled steel 21 (rises above it), and then the retaining of the pressure beam 3 begins to its original position and the load on the parts of the pressure device does not increase, but will be the same as when the rolled four) .

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Editor T. Parfenova

Compiled by V. Shebalkin

Tehrel M. Khodanich Proofreader V. Butt ha,

Order 4666/16

Circulation 1001

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5

Production and printing company, Uzhgorod, st. Project, 4

Subscription

Claims (6)

1. CLIPPING DEVICE FOR SCISSORS, comprising a clamping beam with a working surface mounted in an inclined guide, and a mechanism for moving the clamping beam along the guide, including a two-arm lever mounted to interact with one shoulder with a movable roller, and a power element in the form of a spring, characterized in that, in order to increase productivity and reliability by eliminating the possibility of jamming the remainder of the cut steel between the upper knife and the pressure beam, the latter is made with inclination the surface of the knives, conjugated at an obtuse angle with the working surface of the beam. 2. The device according to p. 1, characterized in that, in order to reduce dimensions and metal consumption, the working surface of the pressure beam is offset relative to the longitudinal axis of symmetry. 3. The device according to claim 1, wherein the mechanism for moving the presser beam is provided with a rod pivotally connected to one end with the middle part of the presser beam and the other with the free shoulder of the two-shouldered lever, while the roller is mounted on a scissor slide . 4. The device according to paragraphs. 1 and 3, characterized in that the spring 'of the mechanism for moving the clamping beam at one end is connected to the thrust and the other to the bed of scissors at a point located below the articulation of the thrust with the clamping beam with the possibility of directing the deformation force of the spring towards the movement of the clamping beam into the working position and the creation of the last tilting moment directed in the direction opposite to the moment from the gravity of the pressure beam. 5. The device according to 'paragraphs. 1 and 3, characterized in that the spring 'on the mechanism for moving the clamping beam at one end is connected with the clamping beam, and the other - with the guide' or the bed of scissors at a point located above the hinged connection of the rod with the clamping beam with the possibility of directing one of the components of the force deformation of the spring in the direction opposite to the direction of action of the mass force of the pressure beam, and the other in the direction of movement of the pressure beam in the working position. 6. The device according to paragraphs. 1 and 3, about τη, and that the spring of the mechanism for moving the clamping beam at one end is connected to the shoulder of the lever in contact with the roller, and the other / end is connected to the rod at a point remote from the hinge of its connection with the two-arm lever in the direction opposite to the hinge - ru connection with the clamping beam.