RU2293628C2 - Flying shears - Google Patents

Abstract

FIELD: metallurgical machine engineering.

SUBSTANCE: shears include housing; shearing mechanism arranged in housing and having upper cutter holder with upper cutter and lower cutter holder joined with upper cutter holder through hinges and having lower cutter; main drive eccentric shaft. In order to perform flying shearing and stationary shearing shears are provided with hydraulic cylinders having bodies and rods jointly coupled with upper cutter holder and also with additional eccentric shaft joined by means of two connecting rods with lower cutter holder. In order to provide motion of both cutter holders one towards other, main eccentric shaft is joined with lower cutter holder and it has two additional eccentrics carrying with possibility of rotation bodies of said hydraulic cylinders. Main and additional eccentric shafts are joined through gear transmissions at gear ratio 0.5.

EFFECT: enlarged manufacturing possibilities of shears.

2 cl, 2 dwg

Description

The invention relates to the field of metallurgical engineering, and in particular to cutting devices used to separate a moving strip on the move and installed in the rolling mill lines in front of the finishing group of stands for cutting off the non-standard ends of the strip.

Flying scissors are known (A.A. Korolev. Mechanical equipment of rolling shops of ferrous and non-ferrous metallurgy. M., Metallurgy, 1976, pp. 268-269), in the frame of which are installed upper and lower drums with knives connected between a cylindrical gear with oblique teeth mounted on the ends of the shafts of the drums from the drive side. The lower drum of the scissors is driven and is connected with an electromechanical drive.

When the drums rotate, the knives receive rotational motion along circular paths, at certain points of which they are aligned to cut, while their horizontal speed coincides with the speed of the strip moving through the scissors.

Disadvantages of scissors:

- on scissors it is possible to cut only a moving strip, because knives are combined to cut when moving along circular paths.

As a prototype, flying scissors were selected for cutting a hot-rolled strip according to the USSR author's certificate No. 1704962 A1, MKI B 23 D 25/06.

The scissors contain a cutting mechanism located in the bed, consisting of an upper knife holder with an upper knife and connected to it through hinges of the lower knife holder with a lower knife, and also a drive eccentric shaft, which is connected to the upper knife by the holder. When working with scissors, the rotation of the eccentric shaft is converted into vertical and horizontal movement of the upper and lower knife holders with knives.

In the scissors of the prototype, some of the disadvantages inherent in the previous design of scissors are eliminated.

In these scissors, the connection of the upper and lower knife holders is carried out through a hinged-lever system, which eliminates the rigid relationship between the horizontal and vertical components of the speed of the knives, as in the described drum scissors.

Disadvantages of scissors:

- the clearance between the knives depends on the eccentricity of the eccentrics of the drive shaft and in real scissors does not exceed 200 mm;

- limited thickness of the cut metal (12-15 mm) in connection with the implementation of vertical and horizontal movement of the knives from one eccentric shaft. Therefore, the capture of metal by knives can occur only when their horizontal speed coincides with the speed of the strip, which is possible only if the cut begins in the angular position of the eccentricity of the eccentric shaft, not more than 30-45 ° from the vertical;

- the location of the main drive eccentric shaft above the strip also limits the upper limit of its thickness;

- the inability due to the design of the drive to use scissors for both volatile and stationary cutting.

The basis of the invention is the task of expanding the technological capabilities of flying scissors.

This problem is solved due to the technical result, which consists in creating the ability to use flying shears for both flying and stationary cutting, as well as by increasing the range of processed strips in thickness.

To achieve the above result, flying shears containing a bed with a cutting mechanism located therein in the form of an upper knife holder with an upper knife and connected to the upper knife holder by means of hinges of the lower knife holder with a lower knife and the main drive eccentric shaft, according to the invention, are equipped with two volatile and stationary cuts having casings with hydraulic cylinders, the rods of which are pivotally connected to the upper knife holder, and an additional eccentric shaft connected via In order to ensure oncoming movement of the upper and lower knife holders, the main eccentric shaft is connected to the lower knife holder and is made with two additional eccentrics, which are mounted to rotate the cylinder body, while the main and additional eccentric shafts are interconnected by gear gears with a total gear ratio of 0.5.

In addition, in the scissors, the upper and lower knife holders are connected by hinges and eccentric axes mounted in the lower knife holder with the possibility of their rotation.

As a result of a comparative analysis of the proposed solution with the prototype, it was found that they have the following common features:

- bed;

- upper knife holder with a knife;

- lower knife holder with a knife;

- main drive eccentric shaft;

as well as distinguishing features:

- two hydraulic cylinders;

- an additional eccentric shaft and two connecting rods connecting this shaft with the lower knife holder;

- the main drive eccentric shaft is made with two additional eccentrics;

- the main drive eccentric shaft is connected to the lower knife holder;

- the housing of the hydraulic cylinders are mounted for rotation on additional eccentrics of the main eccentric shaft;

- the rods of the hydraulic cylinders are pivotally connected to the upper knife holder;

- the main drive eccentric shaft and the additional eccentric shaft are interconnected by means of gears with a total gear ratio of 0.5;

- hinges connecting the upper and lower knife holders are equipped with eccentric axes mounted in the lower knife holder with the possibility of rotation.

Thus, the proposed design of flying scissors has new structural elements, new relationships of nodes and parts, new forms of execution of parts and nodes.

Between the distinguishing features and the achieved technical result, there is a causal relationship.

Due to the fact that the scissors are equipped with an additional eccentric shaft and two connecting rods connecting this shaft with the lower knife holder, it became possible to separate the mechanisms that communicate the horizontal movement of the knives and their movement to the cut, and with the same size of the eccentrics of the main drive eccentric shaft, increase the thickness of the cut strips.

Thus, the range of application of scissors is expanded.

In addition, due to the fact that the scissors are equipped with two hydraulic cylinders and two additional eccentrics made on the main drive eccentric shaft connected to the lower knife holder, while the cylinder bodies are mounted for rotation on additional eccentrics, and the cylinder rods are pivotally connected to the upper knife holder, possible:

- carry out both volatile and stationary strip cutting;

- increase the clearance between the knives in the initial position with the same value of the eccentrics of the main shaft and increase the thickness of the processed strip.

It also expands the range of application of scissors.

Further, due to the fact that the main drive eccentric shaft and the additional eccentric shaft are interconnected by means of gears with a gear ratio of 0.5, it became possible to optimally use the eccentric shafts of the scissors to inform the knives of horizontal and vertical movement to the cut and with the same amount of eccentrics of the main shaft to increase the thickness of the cut strip, which also extends the range of application of scissors.

Further, due to the fact that the hinges connecting the upper and lower knife holders are equipped with eccentric axes mounted in the lower knife holder with the possibility of rotation, for example, connected via levers with hydraulic cylinders mounted on the lower knife holder, it became possible to quickly change the gap between the knives and expand thickness range of cut strips.

Due to the possibility of carrying out both volatile and stationary cutting in a wide range of strip thicknesses, scissors can be used both in lines of continuous and semi-continuous broadband mills, and in reversing mills with coilers in furnaces where it is necessary to cut off the ends of strips in a wide range of thicknesses as with strip movement , and at her stops.

The exception from the above set of distinctive features of at least one does not ensure the achievement of a technical result.

The claimed technical solution has an inventive step, because the proposed design of flying shears for specialists does not explicitly follow from the prior art.

The claimed technical solution is unknown from the prior art, and therefore it is new.

The claimed invention is industrially applicable, because its technological and technical performance is not difficult. According to this technical solution, the technical project of flying scissors for mill 1500 of OJSC Novolipetsk Metallurgical Plant was completed.

Thus, the claimed invention may be granted legal protection, as it is new, has an inventive step and is industrially applicable, i.e. meets all the criteria of the invention.

The invention is illustrated by drawings, which depict:

figure 1 is a kinematic diagram of flying scissors;

figure 2 is a kinematic diagram of the cutting mechanism.

Flying scissors consist of a bed 1, a cutting mechanism, including an upper knife holder 2 with an upper knife 3, a lower knife holder 4 with a lower knife 5.

The connection of the upper 2 and lower 4 knife holders is carried out through hinges with eccentric axes 6, 7, connected through levers 8, 9 with hydraulic cylinders 10, 11, (Fig.2) mounted on the lower knife holder.

The lower knife holder 4 is mounted on the eccentrics 12, 13 of the main drive eccentric shaft 14 connected to the drive 15 through the gear 16.

On additional eccentrics 17, 18 of the drive eccentric shaft 14, hydraulic cylinder bodies 19, 20 are installed, the rods of which 21, 22 are pivotally connected to the upper knife holder 2.

In the bed of scissors 1, an additional eccentric shaft 23 is installed, connected through the connecting rods 24, 25 with the lower knife holder 4 and through the gears 26, 27 with the drive 15.

The total gear ratio of the gears between the main eccentric shaft 14 and the additional eccentric shaft 23, i.e. W14 / W23 is 0.5.

Flying scissors work as follows.

1. Flying cut mode.

The drive eccentric shaft 14 receives rotation from the drive 15 through the gear 16. At the same time, fluid pressure is supplied to the rod cavities of the hydraulic cylinders 19,20, the rods of which 21,22 are lowered to the lower position relative to the eccentric shaft 14, the upper knife holder 2 for the time preceding the start of the cut. The force of the hydraulic cylinders corresponds to the cutting force.

Oncoming movement to the upper upper and lower 4 knife holders receive from rotating eccentrics 12, 13 and 17, 18.

The horizontal speed when cutting the moving strip, the upper 2 and lower 3 knife holders receive through the connecting rods 24, 25 from the additional eccentric shaft 23 rotating through the gears 27, 26, the rotation speed of which is 2 times lower than the rotation speed of the drive eccentric shaft 14.

While the rotation angle of the eccentrics 12, 13, 17, 18 during the cutting period can be 90 ° (for a strip of large thickness), the rotation angle of the additional eccentric shaft 23 is 45 °, which allows matching with an accuracy of about 10-15% the speed of the strip and the speed of the knives during the cutting period and to provide a high-quality flying cut. After the strip sections, the main drive eccentric shaft 14 and the additional eccentric shaft 23 are stopped in the initial position, and the hydraulic cylinders 19, 20 additionally raise the upper knife holder 2 to the upper position for passing metal.

2. Stationary cut mode.

From the drive 15 through the gear 16, the main drive eccentric shaft 14 is rotated to a position in which the eccentrics 17, 18 are lowered vertically downward and the eccentrics 12, 13 are raised vertically upward. Using an additional eccentric shaft 23, the knives 3, 5 are installed in a vertical or close plane. In this position, the scissors are fixed by the drive 15.

Pressure is applied to the rod cavities of the hydraulic cylinders 19, 20, the upper knife holder 2 is lowered to the extreme position, and after the strip is cut, the upper knife holder 2 rises to its original position. The eccentric shafts 14, 23 are also returned by the actuator 15 to its original position.

The clearance between the knives 3, 5 is adjusted by rotating the eccentric axes 6, 7 through the levers 8, 9 from the hydraulic cylinders 10, 11 and fixing them from the same hydraulic cylinders in a predetermined position.

From the foregoing, it can be seen that the proposed flying scissors allow cutting the strip in a wide range of thicknesses and in two modes: stationary and volatile, which allows the use of scissors of this design both in traditionally accepted continuous and semi-continuous mills, and in reversing mills for cutting defective end sections of the strip, in reversing mills with winders in furnaces, i.e. they have wide technological capabilities and a wide range of applications.

Claims (2)

1. Flying scissors containing a bed with a cutting mechanism located on it in the form of an upper knife holder with an upper knife and connected to the upper knife holder by means of hinges of the lower knife holder with a lower knife and the main drive eccentric shaft, characterized in that they are equipped with a flying and stationary cut two hydraulic cylinders having housings, the rods of which are pivotally connected to the upper knife holder, and an additional eccentric shaft connected by means of two connecting rods to the lower knife holder body, to ensure the oncoming movement of the upper and lower knife holders, the main eccentric shaft is connected to the lower knife holder and is made with two additional eccentrics, which are mounted with the ability to rotate the housing of the hydraulic cylinders, while the main and additional eccentric shafts are connected by gears with a common gear ratio of 0, 5. 2. Flying scissors according to claim 1, characterized in that the upper and lower knife holders are connected by hinges and eccentric axes mounted in the lower knife holder with the possibility of rotation.

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