RU80663U1 - 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 a beam to the bed 1, mechanism 7 regulating the horizontal clearance between the upper movable knife 4 and the lower fixed knife 2, including vertical wedge guides 8, the removal mechanism of the upper movable knife 4 during the reverse stroke of the knife beam 3. Furs ism withdrawal of the upper knife, made in the form of two vertical levers 9 mounted on the frame 1 from the side of the knife beam 3 opposite to the upper knife 4 with the possibility of rotation in the vertical plane and with the possibility of interaction with the wedge guides 8 of the clearance adjustment mechanism 7, while the upper ends of the levers 9 are mounted on a bed on the axis 10 with the possibility of rotation in a vertical plane, and the lower ends are connected by adjustable rods 11 with a rotary eccentric shaft 12 equipped with a gear drive 13 with a sensor 14 control the angle of rotation. 5 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 edge scissors containing a bed, 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 longitudinal cutting unit and the mechanism of removal 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.

Closest to the proposed technical solution for the purpose, design and technical result achieved are shears 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 shaft , a mechanism for regulating the horizontal gap between the knives in the form of vertical wedge guides, a mechanism for removing the upper movable knife with the opposite de knife beam, made in the form of vertical wedge guides mounted on the side of the knife beam opposite the upper knife, the clamping mechanism mounted on the bed from the side of the upper knife (Patent RU No. 64967, MPK B23D 15/06, 01/10/2008)

The disadvantage of the wedge mechanism of removal of the upper knife during the reverse stroke of the knife beam is that it is possible to jam wedges and slow down the movement, as well as the inability to set the amount of removal of the knife depending on the vertical

moving wedges, which leads to insufficient accuracy, reliability and speed of removal of the upper knife

The objective of the proposed scissors is to increase the reliability and durability of the scissors by eliminating the above disadvantages.

The problem is solved in that in the well-known 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 of a drive crank shaft installed in the bed, a mechanism for adjusting the horizontal clearance between the knives, including vertical wedge guides installed in pairs on each side of the knife beam with the possibility of vertical movement, push mechanism for constantly pressing the knife the first beam to the vertical wedge guides mounted on the frame from the upper knife side, the mechanism for removing the upper movable knife during the reverse stroke of the knife beam is made in the form of two vertical levers mounted on the frame from the side of the knife beam opposite the upper knife with the possibility of rotation in the vertical plane and with the possibility of interaction with the wedge guides of the clearance control mechanism, while the upper ends of the levers are fixed on the frame on horizontal axes, and the lower ends are connected by adjustable rods with a rotary eccentric shaft equipped with a gear drive with a sensor for the angle of rotation.

This constructive implementation of scissors for cutting sheet material allows you to eliminate the bending of the edge of the sheet during the reverse stroke 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 the scissors in plan view from the top.

Figure 2 shows a section aa in figure 1

Figure 3 shows a section bB in figure 1

Figure 4 shows a section bb in figure 3

Figure 5 shows a kinematic diagram of the mechanism of abduction of the upper knife.

Scissors consist of a bed 1 with a fixed knife 2 fixed in it, a knife beam 3 with an upper movable knife 4 fixed in it mounted on a drive crank shaft 5 and connected by a beam (not shown in the drawing) with a bed 1, mechanism 6 for adjusting the horizontal clearance between the knives 2, 4 with wedge guides 7 installed in pairs on each side of the knife beam 3 with the possibility of vertical movement, the removal mechanism of the upper knife 4

with the reverse stroke of the knife beam 3, made in the form of two vertical rotary levers 8 mounted on the frame 1 from the side of the knife beam 3, opposite the upper movable knife 4 with the possibility of rotation in the vertical plane and interact with the wedge guides 7 of the mechanism 6 for adjusting the clearance between the knives 2 , 4, while the upper ends of the pivoting levers 8 are fixed on the frame 1 on the horizontal axes 9, and the lower ends are connected by adjustable rods 10 with a mounted rotary eccentric shaft 11 equipped with a gear with a drive 12 and a sensor 13 for controlling the rotation angle of the eccentric shaft 12. 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 using push mechanisms 14 mounted on the frame 1 with side of the upper knife 4 in the form of a spring mechanism or hydraulic cylinder.

Scissors work as follows.

The sheet to be cut is centered on the roller table and fed into the cutting zone. Before cutting the sheet, a horizontal lateral gap is set between the knives 2 and 4, depending on the thickness of the sheet, which is fixed by the eccentric shaft 11. The scissors are cut and when the crank shaft 5 is turned, the knife beam 3 with the upper knife 4 is lowered, the sheet is cut. At constant pressure of the pressure mechanisms 14, the knife beam 3 with wedge guides 7 adjacent to its sides rests against the rotary eccentric shaft 11 through adjustable rods 10, fixing the horizontal clearance between the knives 2, 4. At the end of the cut, according to the signal of the crank shaft sensor 5 (in the drawing not shown) actuator 12 is activated, the eccentric shaft 11 is turned, and takes the levers 8 away from the wedge guides 7. Under the action of the pressure mechanisms 14, the knife beam 3 with the upper knife 4 forms a gap that allows the knife bar to be lifted ke 3 without friction on the sheet. When the upper movable knife 4 leaves the sheet zone, the gear drive 11 rotates the eccentric shaft 12 by an angle returning the knife beam 3 through the levers 9 to its original position. The rotation angle of the eccentric shaft 11 with a given accuracy is constantly monitored by the sensor 13.

Such a kinematic scheme of scissors provides an increase in the quality of the edge of the sheet.

Claims (1)

Shears 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 installed in the bed with the possibility of movement along the axis of the crank shaft, a mechanism for adjusting the horizontal clearance between the knives, including vertical wedge guides installed in pairs on each side of the knife beam with the possibility of vertical movement, the clamping mechanism for constant the second pressing of the knife beam to the vertical wedge guides mounted on the bed from the upper knife side, the mechanism of removal of the upper movable knife during the reverse stroke of the knife beam, characterized in that the mechanism of removal of the upper knife is made in the form of two vertical levers mounted on the bed from the side of the knife beam opposite to the upper knife with the ability to rotate in a vertical plane and interact with the wedge guides of the clearance adjustment mechanism, while the upper ends of the levers are fixed on one on the axis, and the lower ends are connected by adjustable rods to a rotary eccentric shaft equipped with a gear drive with a sensor for controlling the angle of rotation.