RU64967U1 - SCISSORS FOR CUTTING SHEET MATERIAL - Google Patents

Abstract

The utility model relates to the processing of metals by pressure and can be used at the cutting sites of rolling mills. Scissors for cutting sheet material, containing a bed 1 with a fixed knife 2 fixed therein, a knife beam 3 with an upper movable knife 4 fixed on it, mounted on an eccentric neck of the drive crank shaft 5 mounted in the frame 1, and connected by the beam 6 to the frame 1, the mechanism 7 for regulating the horizontal gap between the upper movable knife 4 and the lower fixed knife 2, including vertical wedge guides 8, is equipped with a mechanism for removing the upper movable knife 4 during the reverse stroke of the knife bar lki 3, made in the form of vertical wedge guides 9 with a drive for moving them. The wedge guides 9 are installed between the bed 1 and the wedge guides 8 of the horizontal clearance adjustment mechanism 7 from the side of the knife beam 3 opposite to the upper movable knife 4 with the possibility of movement in the vertical direction and are connected by connecting rods 10 with a drive of their movement, including an eccentric shaft 11 mounted in supports 12 and connected by a coupling 13 to an electric motor 14. Also, the scissors are equipped with a clamping mechanism 17 for constantly pressing the knife beam 3 to the wedge guides 8, 9, installed m on the bed 1 from the side of the upper knife 4 and made in the form of a spring mechanism or hydraulic cylinder 2 z.p. f. 4 ill.

Description

The utility model relates to the processing of metals by pressure, namely, to shears for cutting sheet material, and can be used in cutting lines of rolling shops, as well as in procurement workshops of engineering plants.

Known scissors for trimming the edges of metal sheet metal containing nodes of longitudinal and transverse cutting of sheet metal, each of which has a lower fixed knife mounted in the housing, and an upper movable knife mounted on a knife beam, a mechanism for adjusting the horizontal clearance between the upper and lower knives of the node longitudinal cutting and the removal mechanism of the upper knife, made in the form of a copier mounted on the crank shaft of the transverse cutting unit. (RU 2058859 B23D 15/06, 04/27/96).

Despite the existence of a mechanism for regulating the horizontal clearance between the upper and lower knives, as well as a mechanism for removing the upper knife, these scissors are more likely to skew the upper movable knife relative to the lower fixed knife due to backlash in the supports of the knife beam and its articulated connections with the drive, and also the lack of precise guides for the knife beam of the movable knife. A disadvantage of the known scissors is also the complexity of the structural implementation.

The closest to the proposed technical solution for the purpose, design and technical result achieved are scissors for cutting sheet material containing a lower fixed knife fixed in a bed and an upper movable knife fixed in a knife beam mounted on an eccentric neck mounted in the bed of the crank drive shaft and pivotally connected to the beam with the bed, the mechanism for regulating the horizontal clearance between the knives in the form of vertical wedge guides, in pairs connected with two shoulders levers, (Patent RU No. 588969, IPC B23D 15/06, 12/10/2006)

A disadvantage of the known scissors is that there is no retraction of the upper knife from the cutting plane during the reverse stroke of the knife beam. During the reverse stroke of the upper knife, the edge of the sheet that remains on the table is bent due to the high friction force between the plane of the sheet and the upper knife, while the sheet is still clamped by clamps. Increased wear of the upper knife also occurs.

The objective of the proposed scissors is to increase the reliability and durability of the scissors by eliminating the bending of the sheet edge during the reverse stroke of the knife beam and increasing the durability of the upper knife.

The problem is solved in that the known scissors for cutting sheet material containing a lower fixed knife fixed in the bed and an upper movable knife fixed in a knife beam mounted on the eccentric neck of the drive crank shaft mounted in the bed, articulated with the beam with the bed, the regulation mechanism the horizontal gap between the knives, made in the form of vertical wedge guides installed in pairs on each side of the knife beam with the ability to move vertically direction, equipped with a mechanism for removing the upper movable knife during the reverse stroke of the knife beam, made in the form of vertical wedge guides installed between the bed and the wedge guides of the side clearance adjustment mechanism from the side of the knife beam opposite the upper knife, with the possibility of movement in the vertical direction, the drive moving them , the scissors are also equipped with a mechanism for constantly tightening the knife beam to the vertical wedge guides, while the mechanism for constantly tightening the lips Credited on the frame side and the upper knife is designed as a spring mechanism or a hydraulic cylinder.

Such a constructive implementation of scissors for cutting sheet material allows you to eliminate the bending of the edge of the sheet during the reverse stroke upward of the knife beam and increase the service life of the upper knife.

The proposed scissors for cutting sheet material are presented in the drawings.

Figure 1 shows a top view of the scissors.

Figure 2 shows a section aa in figure 1

Figure 3 shows a section bB in figure 2

Figure 4 shows a section bb in figure 2

Scissors consist of a bed 1 with a fixed knife 2 fixed therein, a knife beam 3 with an upper movable knife 4, a crank shaft 5, a rocker arm 6, a horizontal clearance control mechanism 7 between the knives 2, 4 with wedge guides 8 mounted in pairs on each side of the knife beam 3, the removal mechanism of the upper knife 4, made in the form of vertical wedge guides 9 installed between the frame 1 and the wedge guides 8, the mechanism 7 for adjusting the lateral clearance from the side of the knife beam 3, opposite the upper movable knife 4 with the ability to move to

vertical direction. The wedge guides 9 by means of connecting rods 10 are connected to a drive drive for the wedge guides 9, including an eccentric shaft 11 mounted in bearings 12 and connected by a coupling 13 to an electric motor 14. In this case, the knife beam 3 is connected to the beam 6 by an axis 15, and the beam 6 is connected to the bed 1 by the axis 16. The knife beam 3 is mounted on the eccentric neck of the crank shaft 5 with the possibility of movement along the axis of the crank shaft 5 and with constant pressing against the wedge guides 8 and 9 using the clamping mechanism 17 mounted on Anino by the upper knife 4 in the form of a spring mechanism or a hydraulic cylinder.

Scissors work as follows.

Before cutting the sheet, a horizontal lateral gap is set between the knives 2 and 4, depending on the thickness of the sheet, and the scissors are turned on for cutting. At the end of the cut, before the knife beam 3 goes up, the drive for moving the wedge guides 9 is turned on and the wedge guides 9 are lowered down, forming a gap the size of which moves the knife beam 3 with the upper movable knife 4 under the action of the clamping mechanism 17. As a result of the displacement knife beam 3 on the eccentric neck of the crank shaft 5 between the sheet and the upper movable knife 4, a gap is formed, which allows the knife beam 3 to rise without friction on the sheet.

When the upper movable knife 4 leaves the sheet zone, the drive for moving the wedge guides 9 is turned on and the wedge guides 9 return the knife beam 3 to its original position.

This kinematic scheme of scissors provides improved quality of the cut edge of the sheet.

Claims (3)

1. Scissors for cutting sheet material, comprising a lower fixed knife fixed in the bed and an upper movable knife fixed in a knife beam mounted on the eccentric neck of the drive crank shaft mounted in the bed with the possibility of movement along the axis of the shaft and pivotally connected with the beam to the bed, a mechanism for adjusting the horizontal gap between the knives, including vertical wedge guides mounted in pairs on each side of the knife beam with the possibility of vertical movement i, characterized in that the scissors are equipped with a mechanism for retracting the upper movable knife during the reverse movement of the knife beam, made in the form of vertical wedge guides installed between the bed and the wedge guides of the side clearance adjustment mechanism from the side of the knife beam opposite the upper knife, with the possibility of movement in the vertical direction and drive movement of the wedge guides are also equipped with a clamping mechanism for constantly pressing the knife beam to the vertical wedge guides him, while the clamping mechanism is mounted on the bed from the upper knife. 2. Scissors for cutting sheet material according to claim 1, characterized in that the clamping mechanism for constantly pressing the knife beam to the vertical wedge guides is made in the form of a spring mechanism. 3. Scissors for cutting sheet material according to claim 1, characterized in that the clamping mechanism for constantly pressing the knife beam to the vertical wedge guides is made in the form of a hydraulic cylinder.