RU2323805C2 - Cable cutting device - Google Patents

Abstract

FIELD: mechanics.

SUBSTANCE: device consists of bed, cable supporting unit and cutting tool. Cutting tool consists of fixed and movable part. The fixed part is connected to the cable support unit. The movable part is installed in a holder which is connected to the electrical drive of the cutting tool. Device is equipped with movable frame and movement mechanism of the same frame comprising an electrical cable of the frame, horizontal guides and limit stop. Cable support device and cutting tool are secured on the frame. At that the cable support device has at least two bearing rollers and at least one clamping roller located over the first bearing roller. Bearing rollers are situated at the same level in the upper portion of the frame from its opposite ends and have parallel axes and a common upper tangent portion which defines the movement line of the cable through the frame. The first and the second bearing rollers are located so that the length of the cable movement line is between them in the cutting zone. The fixed part of the cutting tool in the form of a knife is able to perform forced reciprocating movements in the cutting zone and is located below the said cable movement line.

EFFECT: provides upgraded cut quality.

4 cl, 1 dwg

Description

FIELD OF THE INVENTION

The invention relates to cutting machines using metal cutting with scissors or the like.

The cable cutting device is intended for use in cable manufacturing. It can also be used when shipping cable products to the consumer by rewinding the cable from one reel to another with a measure of a given meter. In fact, it is an electromechanical scissors with counter-parallel cutting elements. Carries out a quick qualitative cut of the cable, the thickness of which varies over a wide range. The cutting process is carried out without stopping the movement of the cable, that is, it can be used in an automated line with continuous cable pulling.

State of the art

In cable production, when winding the manufactured cable onto shipping drums or coils, as well as at enterprises that rewind a cable of a given length from the pickup drum to the pickup drum, the question arises of how to quickly cut the cable at the right time. For a cable of large diameter (more than 60 mm), some time is required to carry out this manipulation. The most common way is to manually cut the cable (or using some kind of drive) with special scissors, and with the rewinding process stopped. And since the ends of the cable at the cutting site should not be deformed (flattened), the cutting force and the duration of the manipulation should be optimal, corresponding to the thickness and type of the specific cable (i.e. the braid material and core material).

On the website of JSC “Production of winding equipment” www.namotka.com, the process of working on the PS-30-600 rewinder is shown in pictures, where one of the operations is to cut the cable using special mechanical scissors fixed on the bed of the rewinder in the cutting zone.

There are many models of scissors designed for cutting cables of any sections and various materials. for example

- Sector scissors for cutting the NS-3M cable, designed for cutting aluminum (3 × 240 mm ² ) and copper (3 × 150 mm ² ) cables with a maximum diameter of 70 mm.

- Sector scissors NS-04-60BS BSEC designed for cutting aluminum and copper cables, including armored, with a diameter of up to 60 mm, total cross-section up to 960 mm ² .

- Sector cable shears NS-95, designed for cutting copper cable with a cross section up to 4 × 95 mm ² and aluminum cable with a cross section up to 4 × 120 mm ² , diameter up to 52 mm. Unlike manual scissors in this tool, the force is transmitted through the gear mechanism (ratchet mechanism). Despite the small size of the scissors, it is possible to work with cables of large cross sections.

The disadvantage of using scissors is not a very high-quality cut and the need to stop the cable pulling for the duration of the manipulation.

There are known designs of special devices for cutting wires and cables, the cutting knife of which consists of two parts - fixed and movable.

Thus, in a cutting device according to US Pat. No. 4,131,040, intended for accurately profiling the ends of a flat cable, the cutting device consists of a fixed and a movable part arranged vertically one above the other. The fixed part is two knives mounted vertically and parallel to each other at the base, the distance between which is equal to the required width of the end of the flat cable. And the moving part is the press located above these knives, the width of which is equal to the distance between the knives. The press rests on the substrate, on which the end of the cut-off cable is laid, and this substrate itself is spring-loaded connected to the base in the middle between the knives. The press drops sharply down between the knives, and the cable end fixed between it and the substrate is in the path of the knives that cut off the protruding edges from the cable. The spring lifts the substrate with the cable up after the termination of the force on the press.

This device can only be used to cut the ends of a flat cable and is not intended to cut a round cable, especially during movement.

According to this principle, where the cutting tool consists of two parts - fixed and movable, the relative movement of which is directed towards each other, cutting devices for round cable can be made.

As a prototype, you can take the well-known device for cutting cable and wires according to the USSR copyright certificate No. 948502. This device contains a housing on one side of which the knife and support for the cut product are fixedly fixed. The fixed knife is mounted so that its blade can touch the cut product. The profile of the blade is curved, equidistant to the profile of the lodgement of the support. The movable knife is mounted on the gear rack of the rack and pinion gear. The rail can be run on a gear wheel, which is fixed motionless relative to the housing on an axis on which the carrier is mounted in the form of tension springs, and is equipped with a traction that can be attached to one of the known drives. The device operates as follows. A cable is laid on a support. When moving the rod, the gear rack rotates about the axis with the movable knife, rolling around the gear wheel. The movable knife moves radially in the direction of the cut product and at the same time along the tangent to its cross section, that is, it moves in accordance with the law of the involute curve, providing “shaving” cutting over the entire cross section of the cut cable. This device can be controlled automatically and provides a quality cut, but provided that the cable is in a static state and laid on a profile lodgement.

A distinctive feature of modern cable production is automation and process continuity. The equipment of production allows continuous winding of its assortment of products on shipping drums with a wide range of sizes. Automated lines are equipped with control panels that provide the ability to set the necessary settings for automated winding: meter, cable type, cable diameter, drum type. Therefore, it is important to automate and manipulate cable cutting at a certain point after measuring the required footage. Moreover, the time of the cutting process itself should be selected optimally so that the cut is smooth and high-quality, and the winding process does not have failures due to forced stops.

The technical solution of the cable cutting device proposed in the present application for the invention allows to fulfill all these conditions.

Disclosure of invention

The invention consists in the design of the inventive device.

Cable cutting devices are mounted on a bed on which a first electric drive is installed, which provides reciprocating movement of the structure mounted on a movable frame and which includes a cable support device, a cutting tool and a second electric drive designed to ensure the functioning of this cutting tool. The area of movement of the frame is limited mechanically, for example by a protrusion on the bed. The frame can be made, for example, in the form of a transparent structure of the upper and lower rungs and vertical racks between them.

The cable support device is mounted on the upper rungs of the frame and contains two support rollers with parallel axes located at the same level, and a pressure roller located above the first support roller. A line of cable movement runs along the upper tangent to the support rollers. The portion of this line between the rollers defines the cable cutting area. The pinch roller can be connected to any speed sensor, for example, to the axis of the tachogenerator.

The cutting tool consists of a fixed and movable part, namely a stop and a knife. The emphasis can be made in the form of a rectangular prism. The knife can be made in the form of a truncated prism, one of the upper horizontal edges of which forms the blade of the knife. In this case, the lateral faces of both parts of the cutting knife facing each other are located in one vertical plane perpendicular to the cable line of movement. Above the cutting area on the upper rungs of the frame, an emphasis is attached, and a knife is located under the cutting area. The knife is mounted in the holder and has the possibility of vertical reciprocating motion. For more convenient operation of the knife, a platform can be used, on the upper surface of which the knife holder is attached, and the lower surface is connected to a second electric drive mounted on the lower crossbars of the frame. Vertical frame racks serve as guides when the platform moves up and down under the influence of a second electric drive.

The speed of movement of the frame in its area of movement can be set equal to the speed of movement of the cable from the transmitter to the receiver due to the coordinated control of both electric drives. A tachogenerator connected to a pressure roller can serve as a controller: when the above-mentioned speeds are equalized, its angular velocity becomes equal to zero and, accordingly, the output voltage level from it is equal to zero. In this case, the beginning of the cutting process can be controlled by a zero signal from the tachogenerator, and the cutting operation itself is carried out as if in a stationary state of the cable relative to the cutting tool. The initial vertical positions of the stop and knife are set in advance according to the installation data of the rewound material. The length of the frame movement section is quite sufficient to have time to cut the cable at the optimum speed to ensure a high-quality cut depending on the type and thickness of the cable, and is calculated first at the stage of designing the device for a specific technical task. Management and coordination of parameters during the cutting operation is carried out using the engine control unit of both electric drives.

The technical result of the invention lies in the fact that the cutting process is carried out in a state of rest of the cable relative to the cutting tool by moving the cutting tool with the speed of the cable and in the same direction. This provides excellent cut quality, virtually the same level as when cutting with a fixed cable. In this case, there is a complete coordination of the operation of the electric drives, including the initial settings of the cutting tool, the beginning and end of the cutting operation, the rotation speed of the electric motors, due to the use of a common control device, which receives signals from sensors, for example, from a meter meter sensor and from a tachogenerator.

The drawing shows the design of the device for cutting cable in the form of a picture indicating the position numbers of the main elements.

1 - cable

2 - bed

3 - the first electric drive (for the frame)

4 - upper crossbars of the frame

5 - lower crossbeams of a frame

6 - vertical frame racks

7 - engine of the first electric drive

8 - restrictive ledge (on the bed)

9 - cable support device

10 - the first support roller

11 - second support roller

12 - pressure roller

13 - stationary part of the cutting tool - emphasis

14 - movable part of the cutting tool - knife

15 - knife holder

16 - movable platform (for feeding the knife into the cutting zone)

17 - holes in the movable platform

18 - second electric drive (for cutting tool)

19 - engine of the second electric drive

20 - guide frames for moving along the bed

21 - box (for control device)

The implementation of the invention

A cable cutting device is installed between the transmitter and the receiver of the winding cable 1.

The device comprises a frame 2, on which a first electric drive 3 is installed, which provides reciprocating movement of a structure based on a frame made, for example, of upper rails 4, lower rails 5 and vertical struts 6. The section of movement of the frame is limited, on the one hand, by the engine 7 of the first electric drive, on the other hand, by the restrictive protrusion 8 on the bed.

On the upper crossbars 4, a support device 9 for the cable is fixed. It includes a first support roller 10, a second support roller 11, a pressure roller 12 (can be connected to a tachogenerator). The rollers are used to move the cable in the cutting zone on the way from the transmitter to the receiver. The cutting zone is located between the first and second support rollers.

For the cutting operation, a cutting tool is intended, consisting of a fixed part - an abutment 13, rigidly fixed on the upper crossbars 4 of the frame above the cable line in the cutting zone, and a movable part - knife 14, mounted in the holder 15 and located under the cable line in the zone cutting. The knife is made in the form of a truncated prism, one of the upper horizontal edges of which forms the blade of the knife. The emphasis is made in the form of a rectangular prism. The lateral faces of both parts of the cutting tool facing each other are located in one vertical plane perpendicular to the cable line of movement.

The knife holder 15 is fixed to the platform 16, which has through holes 17 through which the vertical racks 6 of the frame pass, playing the role of guides when the platform 16 moves up and down.

On the lower crossbars 5 of the frame, a second electric drive 18 is installed with its own engine 19, providing up-down movement of the platform 16 with a knife 14 for performing the cutting operation.

The guides 20 of the frame, mounted on the frame 2 between the engine 7 and the limiter 8, provide a stable movement of the frame under the influence of the first electric drive 3.

The control unit 17 is electrically connected to both motors of the electric drives (7, 19) and to the tachogenerator 12.

As components in the inventive device, you can use:

first electric drive: linear movement mechanism, for example, type ATL 30;

second electric drive: screw electric jack, for example, type MA-80;

tachogenerator: for example, type TGP;

meter counter: for example, type SM-1.

The control device can be based, for example, on an industrial controller type MK 6040 from Octagon systems, USA.

Description of work (in accordance with the presented drawing)

A cable cutting device is located between the cable pickup 1 and its receiver. Cable 1 is passed through this device so that it lies on the support rollers 10 and 11 of the supporting device 9, which is mounted on the upper crossbars 4 of the frame. A spring-loaded pinch roller 12 connected to the axis of the tachogenerator presses the cable 1 in the region of the first support roller 10. The cutting tool has a range between the first and second support rollers. The control device located in the box 21, according to the known parameters of the rewind cable, gives a control signal to the engine 19, which allows using the electric drive 18 to move the platform 16 with the knife 14 fixed on it to the initial position, providing the desired distance between the knife blade 14 and the stop 13. The same control device generates a signal to the engine 7, and the drive 3 ensures the movement of the frame also in the initial position (extreme to the engine 7).

When the cable is rewound, until the required number of meters is measured out, the meter and the frame and cutting tool are in their initial position. After applying the signal from the meter meter sensor to the control device located in the box 21, a control signal is generated to the motor 7, and the drive 3 starts moving the frame with the cutting tool along the cable. The pressure roller 12, connected to the tachogenerator, as the speed of the frame increases, it begins to slow down and stops at some point, that is, its angular velocity becomes zero. At this moment, the tachogenerator gives a zero signal to the control device, which generates a control signal to the engine 19, which drives platform 16 with the help of electric drive 18. It starts to rise up together with the holder 15 and knife 14 fixed on it, the cable rests on the stop 13 and the blade knife 14 cuts the cable, continuing to slide along the flat face of prismatic stop 13. The relative linear movement of the cable 1 and the cutting tool at this time is zero. The length of the movement of the frame along the guides 20 under the action of the electric drive 3 is calculated in advance at the design stage of the device and is quite sufficient for the cutting tool to cut the cable, providing a high-quality undeformed cut.

Claims (4)

1. A device for cutting a cable comprising a bed, a support device for a cable, a cutting tool consisting of a fixed part connected to a cable support device and a movable part mounted in a holder connected to an electric drive of the cutting tool, characterized in that it is provided a movable frame and a mechanism for moving said frame containing an electric drive of the frame, horizontal guides and a motion limiter mounted on the bed, a supporting device for cable and cutting the first tool is mounted on the frame, and the supporting device has at least two support rollers and at least one pressure roller located above the first support roller, the support rollers are located at the same level in the upper part of the frame from its opposite edges and have parallel axes and a common the upper tangent defining the line of movement of the cable through the frame, the first and second support rollers are located with the placement of a segment of the line of movement of the cable between them in the cutting zone, in which the fixed and movable parts are placed cutting tool, while the stationary part of the cutting tool is made in the form of a stop and fixed above the line of movement of the cable, and the moving part is in the form of a knife and placed under the line of movement of the cable with the possibility of forced vertical reciprocating motion in the cutting zone with the intersection of the line of movement of the cable under the impact of the electric cutting tool, mounted in the lower part of the frame. 2. The device according to claim 1, characterized in that it is equipped with a horizontal platform, on the upper surface of which a holder with a knife is fixed, and the frame is made in the form of upper and lower crossbars and vertical racks, while the cutting tool stop is fixed on the upper crossbar of the frame, an electric drive of the cutting tool is installed on the lower crossbeam of the frame, which is connected to the lower surface of the platform, and the vertical racks are used as vertical guides of the platform during its reciprocating motion. 3. The device according to claim 1, characterized in that the knife is made in the form of a truncated prism, one of the upper horizontal ribs of which forms a knife blade, and the emphasis is made in the form of a rectangular prism, while the side faces of both parts of the cutting knife facing each other are located in one vertical plane perpendicular to the cable line. 4. The device according to claim 1, characterized in that it is equipped with a tachogenerator, the axis of rotation of which is connected to the axis of rotation of the pinch roller.