RU58969U1 - SCISSORS FOR CUTTING SHEET MATERIAL - Google Patents

Abstract

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. The 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 a knife beam mounted on the eccentric neck of the drive crank shaft 5 installed in the frame, the beam 3 is pivotally connected by the beam 6 to the bed. New is that the scissors are equipped with a mechanism for regulating the horizontal gap between the knives 2 and 4, made in the form of vertical wedge guides 7, mounted in pairs on each side of the knife beam 3, with the possibility of moving in the vertical direction and interacting with the side planes of the knife beam 3, with each pair of wedge guides 7 is pivotally connected by rods 8 with two shoulders levers 9, the shoulders of which on the one hand interact with gear drives 10 mounted on the frame 1, are high-speed the ends of which are connected with each other and with electric motors 11. In this case, the knife beam 3 is connected to the beam 6 by an axis 12, and the beam 6 is connected to the frame 1 by a hinge 13. 3 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 (RU 2058859 C1, 6 V 23 D 15/06 , 04/27/96). When it comes to trimming edges, the rental has a different thickness. This leads to wear of the upper movable knife of the slitting unit as a result of friction that occurs in contact between the longitudinal edge of the cut sheet and the working surfaces of the knife. To increase the durability of the knives of the slitting unit and expanding technological capabilities when cutting materials of different thicknesses, the knives are equipped with a mechanism for regulating the horizontal gap between the upper and lower knives of the unit for longitudinal cutting. The mechanism for adjusting the horizontal gap is made in the form of a cam-lever mechanism associated with a knife beam, which is pivotally connected with a lever-connecting rod drive.

Despite the presence of a mechanism for regulating the horizontal position of the fixed and movable knife, in these scissors there is a high probability of skewing of 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, as well as the absence of precise guides for the knife beam of the movable a knife.

Closest to the proposed technical solution for designation and the technical result achieved are shears 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 an eccentric neck mounted in the bed of the drive eccentric a shaft pivotally connected to a beam with a bed. (RU Patent No. 20144968 B 23 D 15/00 06/30/94)., These scissors for increasing the reliability of work are equipped with clips mounted on eccentric shafts with two shoulders diametrically located relative to their center and mounted on a knife beam and spring-loaded to the shoulders of the clips. The scissors also have bushings mounted on the corresponding main necks of the crank shaft, and are pivotally connected to the levers located on the bed, spring-loaded to the bed. The crank shaft is located in the middle of the knife beam.

This design of scissors allows to increase the reliability of their work due to the selection of backlash in bearings and clearances in articulated joints in a vertical plane.

A disadvantage of the known scissors is that there is no regulation between the cutting edges of the knives in the horizontal plane and there are no rigid vertical guides for the knife beam of the movable knife, which does not allow for reliable cutting of materials, when such scissors work, the cutting edges of the knives can skew relative to each other in the horizontal plane .

The objective of the proposed scissors is to increase the reliability and durability of the scissors by stabilizing and regulating the horizontal gap between the knives.

The problem is solved in that the 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 the eccentric neck of the drive crank shaft mounted in the bed, pivotally connected to the bed with a beam, equipped with a mechanism for regulating the horizontal clearance between the knives, made in the form of vertical wedge guides mounted in pairs on each side of the knife beam with the ability to move in the vertical direction and interact with the side surfaces of the knife beams, while each pair of wedge guides is connected by rods with two-arm levers, the shoulders of which on the one hand interact tvuyut with gear drive mounted on the frame, a two-armed levers swing axis parallel to the lower stationary knife and coaxial with each other.

Such a constructive implementation of scissors for cutting sheet material allows you to cut the rolling of different thicknesses, and the synchronization of a pair of wedges with two shoulders levers simplifies the design.

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

Scissors consist of a bed 1 with a fixed knife 2 fixed in it, a knife beam 3 with a movable knife 4, a crank shaft 5, a rocker arm 6, a horizontal clearance between the knives 2, 4, made in the form of vertical wedge guides 7 installed in pairs with each sides of the knife beam 3, with the ability to move in the vertical direction and interact with the lateral planes of the knife beam 3, while each pair of wedge guides 7 is connected by rods 8 with two shoulders levers 9, the shoulders of which are on one side cooperate with gear drives 10 mounted on the frame 1, high-speed

the ends of which are interconnected and with electric motors 11. In this case, the knife beam 3 is connected to the beam 6 by an axis 12, and the beam 6 is connected to the frame 1 by a hinge 13. The knife beam 3 is mounted on the eccentric neck of the crank shaft 5, which is connected to the electric drive (in the drawing not shown).

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, to improve the quality of the cut edge. To do this, turn on the electric motors 11 and through the gearbox 10 and two shoulders levers 9 move the wedge guides 7 in a vertical plane. One pair of wedge guides goes down, while the other pair rises up, as they are pivotally connected with two shoulders 9. The wedge guides 7 act on the knife beam 3 and move it horizontally along the eccentric neck of the crank shaft 5, thereby changing the gap between knives 2 and 4.

The sheet is defined between the fixed 2 and movable 4 knives. When the drive is turned on (not shown in the drawing), the crank shaft 5 moves the knife beam 3, while the movable upper knife 4 cuts the sheet.

This kinematic scheme of scissors provides improved quality of the cut 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 mounted in the bed and articulated by a beam with a bed, characterized in that the scissors are equipped with a regulation mechanism horizontal clearance between the knives, made in the form of vertical wedge guides installed in pairs on each side of the knife beam with the possibility of movement in verti cial direction and interacting with the side planes of the blade beam, wherein each pair of wedge guide coupled rods with a two-armed levers, of which the shoulders on the one hand cooperate with gear drive mounted on the frame, and the swing axis two-armed levers are parallel to the lower stationary knife and interconnected.