RU1777570C - Device for producing fibers from wire - Google Patents

Abstract

Usage: in the manufacture of reinforcement for reinforced concrete. SUMMARY OF THE INVENTION The device comprises a bed, a spreader, an electric drive, a drive, a drive and a driven forming rollers mounted on the shafts, a movable knife with an electric drive. Gears fixed to the shafts are engaged with each other. The shaft is mounted in bearings mounted in an eccentric housing housed in a rack with the possibility of rotation. The roller is mounted on the shaft with an angular displacement relative to the gear coaxial with it by an angle a. tg which is determined from the ratio tg a Neke - (Rex-04d) / Rpon., where R9icc is the radius of the eccentricity of the body, mm; Nr0l. - roller radius, mm; d is the diameter of the wire, mm WITH

Description

The invention relates to equipment for the manufacture of reinforcement for reinforced concrete, in particular for the manufacture of wire steel fibers for fiber concrete.

A device is known for manufacturing fibers by cutting wire into measured lengths, comprising a coil holder, a wire feed mechanism in the form of two rolls, one of which is driven, and a cutting mechanism in the form of a rotatable drive disk, the drive roll and the drive disk being mounted directly on the motor shaft.

A disadvantage of this device is the lack of fiber profiling, which improves the adhesion of fibers to concrete.

A device for manufacturing fiber from a wire is also known, comprising an uncoiler, a drive, a bed with guides

for wire, a fiber-forming mechanism of wire with forming rollers in the form of mounted on shafts with the possibility of interaction of the driven roller with each other and connected to the drive of the driving roller and with a knife for cutting fibers. The gap between the rolls is adjusted using bolts and rubber gaskets - prototype.

This device allows profiling of fibers, but is not reliable and convenient in operation, because when using various wire gauges or manufacturing various profiles, it is necessary to adjust the bolted joint with the elastic gasket.

Such adjustment requires constant monitoring and does not allow stably obtaining a profile with high accuracy. In the process, the rollers slip through each other

V

about

V

with

CA

relative to a friend and this reduces the reliability of the device.

The aim of the invention is to increase reliability by eliminating the slipping of the forming rollers relative to each other and to improve the quality of the finished product by ensuring the constant geometric profile of the fibers.

To achieve this goal, a device for manufacturing fiber from a wire, comprising a bed with guides for wire, a mechanism for forming fibers from wire with forming rollers mounted on shafts so that the driven roller can interact with each other and connected to the drive of the drive roller and with a knife for fiber cutting, is equipped with an additional drive connected to a fiber cutting knife, a gear, the gears of which are placed on the shafts of the forming rollers. The forming rollers are mounted on the shafts by means of bearing bearings, the bearing support of the driven roller located in the housing made in the form of an eccentric, and the driving roller mounted on the shaft relative to the gear coaxial with it, at an angle whose tangent is determined from the dependence

tga

Cxx - (Cxx - 0.4 d) 2

Rpon

where Neke is the radius of the eccentricity of the housing for locating the bearing support of the driven roller;

d is the diameter of the processed wire;

Rpon is the radius of the leading formative roller.

In FIG. 1 shows a device, a General view; in FIG. 2 is a section along AA in FIG. 1, in FIG. 3 - the contact zone of the forming rollers with the wire and the engagement of the teeth of the gears mounted coaxially with the forming rollers; in FIG. 4 is a schematic illustration of the relative position of the forming rollers for calculating the magnitude of the angular displacement.

A device for manufacturing fiber from a wire (Fig. 1) comprises a frame 1, an uncoiler 2, an electric drive 3, guides 4 for a wire 5, a leading forming roller b, mounted on the shaft 7 in the bearing support 8, a driven forming roller 9, installed in the bearing support 11, a movable knife 12 for cutting fibers. The shaft 7 of the roller 6 is connected with an electric drive 3. Po0

5

the movable knife 12 is connected to an additional electric drive 13. On the shafts 7 and 10, gears 14 and 15 are mounted, respectively, forming an additional gear transmission. The shaft 10 of the roller 9 is mounted in bearings 16 located in the eccentric housing 17, fixed in the bearing support 11. The support 11 (Fig. 2) can be made detachable with a gap between the upper and lower parts, bolted together by bolts 18. Leading the roller 6 is mounted on the shaft 7 (Fig. 3) relative to the gear 14 aligned with it, at an angle a, determined from the expression

cabbage JR3Kc- (R3Kc-0.4d) 2 Krol

This expression was obtained by the calculation and experimental method. The angle Ј (Fig. 4) is determined from the ODE triangle in which. The value of f can be found from the right triangle abc

5

0

5

0

5

0

(2)

t v Wex (RSKC - Kn / id) where Rex is the radius of the eccentricity;

d is the diameter of the wire;

Kpl - coefficient of flattening wire.

In equation (2), the term Kp d is the gap between the forming rollers, which is set before the installation starts, taking into account the amount of wire flattening during shaping in the range of wire diameters used, the rigidity of the device nodes, the required accuracy of fiber manufacturing, etc.

Conducted experiments have established that CPL. is in the range of 0.3-0.5, which provides an approximate balance between the number of broken and withstand fibers in the calculated cross section of the stretched fiber-reinforced concrete element. With Kpl. 0.5, the fibers break due to pinch; with Kpl. 0.5, the number of aged fibers sharply increases. Calculations show that when changing the value of KPL. from 0.3 to 0.5, the angle a changes by less than 10, therefore, taking into account the accuracy of the manufacture of gears and the stiffness of the nodes of the device, it is advisable to take Kpl. 0.4 in the calculation. Thus, from the triangle ODE (Fig. 4) we find:

55

tga JUc - (. 4dy (1)

The device operates as follows.

The electric motor 3 drives the drive forming roller 6 and

through the synchronizing gears 14 and 15 the driven forming roller 9. The electric motor 13 drives the movable knife 12, the wire 5 from the unwinder 2, the passage along the guides 4, is captured by the rollers 6 and 9. crimped, acquiring the necessary profile and advancing to the knife 12 where it is cut into segments of equal length. If necessary, change the diameter of the wire being processed or change the profile of the fibers, i.e. the depths of the depressions and the heights of the protrusions, unscrew the bolts 18, thereby releasing the eccentric housing 17 in the bearing support 11, then the housing 17 is rotated by a certain angle corresponding to the necessary change in the clearance between the rollers 6 and 9 and the bolts 18 are tightened again. When the housing is rotated 17, the shaft 10 rotates simultaneously with the roller 9 and gear 15 fixed on it. Due to the fact that the roller 6 is mounted on the shaft 7 with an angular displacement calculated by formula (1), the rotation of the roller 9 does not distort the fiber profile in part get together Foot positioning projections and depressions on the fiber. When the roller 9 is rotated through an angle about its profiling elements will occupy the calculated position relative to the profiling elements of the roller 6. The increase in the interaxal clearance between the shafts 7 and 10 should increase the radial and lateral clearance between the teeth of the gears 14 and 15. The increase in the radial clearance causes only a slight displacement of the contact of the teeth from the tooth leg to the apex, i.e. does not lead to a noticeable deterioration of the engagement, and the lateral clearance is completely selected due to the rotation of the gear 15 through the housing 17, and thus

At the same time, gears 14 and 15 remain in close to optimal engagement.

Claims (1)

SUMMARY OF THE INVENTION A device for manufacturing fiber from a wire, comprising an uncoiler, a bed with guides for wire, a mechanism for forming fiber from a wire with forming rollers mounted on shafts so that the driven roller can communicate with each other and connected to the drive of the drive roller and to the knife for fiber cutting, characterized in that, in order to increase reliability by eliminating the slipping of the forming rollers relative to each other and improving the quality of the finished product by ensuring the constant geometric profile of the fibers, it is equipped with an additional drive connected to a fiber cutting knife, a gear transmission, the gears of which are located on the shafts of the forming rollers, the latter being mounted on the shafts by means of bearing bearings, the bearing support of the driven roller located in the housing, made in the form of an eccentric, and the drive roller is mounted on the shaft relative to the gear coaxial with it at an angle, the tangent of which is determined from the dependence tga JR32Kc- (Neke- 0.4 d) 2 Krol where RSKC is the radius of the eccentricity of the housing to accommodate the bearing support of the driven roller; d is the diameter of the processed wire; Rpon is the radius of the leading formative roller. The needle AND. Figl