RU2622203C2 - Device for cable 3-d bending and cable feed mechanism for this device - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: device contains a cable feed mechanism, a cable bending mechanism and a mechanism for rotating the cable bending mechanism mounted on the frame. The cable transfer unit is made in the form of two rollers, with concave working surfaces facing each other for the cable accommodation. The cable bending mechanism is equipped with a rotation drive of one of the rollers and a cable feeding mechanism. The cable bending mechanism rotation mechanism is made in the form of a cantilever on which a cable bending mechanism is mounted, which can be rotated about the cable axis through a radial bearing. And the electric motors of all the device drives are located outside the zone of cable movement and its bending and are kinematically connected with the drive elements of the mechanisms. In this case, a cable feed mechanism is used which is made in the form of two pairs of cams rigidly connected to the drive shaft, each pair of cams is displaced relative to the other one by 180° and through pushers is connected to the transfer pins located along the tube and connected to slides made with grippers for cable movement in the interaction of the pushers with the cams working surface.

EFFECT: expanded technological capabilities of the device.

2 cl, 7 dwg

Description

The invention relates to the field of material processing, in particular to devices or devices for bending a cable consisting of one or more insulated conductors (cores) or optical fibers enclosed in a sheath. In addition to cores and insulation, the cable may contain a screen, a core, a filler, a metal sheath, an outer sheath. A feature of such cables is either the stiffness of the sheath or conductor, or the softness of the screen sheath, which can be damaged (wrinkled) with large contact stresses (like wire benders). The crushing of the screen sheath is unacceptable, as this leads to a significant deterioration of the radio technical properties of the cable. This creates difficulties when bending, that is, changing the spatial position of one part of the cable relative to another. This distinguishes the cable bending process from the wire bending process - steel, copper or aluminum, where sharp transitions are possible without changing the structure of the material.

A device for bending wire is known from US 7,188,504. This device includes a wire feed mechanism, a rotation mechanism, and a bending mechanism — a bending head carrying two bending tools. The device is equipped with a mechanical device for driving the bending tools in two different directions and for moving the bending tools in a plane perpendicular to the axis around which the bending tools can rotate. The device may include a controller to control the simultaneous operation of mechanical devices, the movement of wire and bending tools.

The invention described in US2005056071 relates to an apparatus for bending pipes. The apparatus for bending pipes in accordance with the invention comprises a fixed supporting frame on which a movable support is connected, connected with a lever of the feeding mechanism, driven around a horizontal axis and forming a unit with a bending head including two rollers.

JPH 08224631 discloses a wire bending apparatus. This device is equipped with a wire feed mechanism in one direction, a tool for clamping the wire, a bending mechanism that bends the wire by rotating the clamping part, and a wire cutting mechanism.

In CN 203367729, H01R 43/28, H02G 1/12, publ. 12/25/2013, a device for stripping and bending a cable is disclosed. The bending mechanism contains a pair of positioning rollers located at the outlet of the cable stripping device, a rod for forming the cable and a pneumatic mechanism, pairs of positioning rollers are located respectively on both sides of the cable, the cable passes through the central position between the pair of rollers, the rod is located next to the rollers and is located on one side of the cable and connected to a pneumatic mechanism. The pneumatic mechanism is associated with a control mechanism for actuating the rod with reciprocating motion in the radial direction of the cable.

This device for bending cable in two directions (in the same plane), contains a cable feed mechanism and a cable bending mechanism mounted on the frame, while the cable feed mechanism is a cable moving assembly along the guides to the cable bending mechanism made in the form of two rollers facing concave working surfaces towards each other to place the cable in the profile formed by the working surfaces of the rollers to bend this cable around the circumference of the working surface of one of the rollers

This decision was made as a prototype.

Existing known solutions have a significant drawback: a significant part of the bending zone is occupied by structural elements that do not allow bending of complex and spatially extended cables, since these elements are often located or moving in the space where the bent cable should be. This significantly narrows the technological capabilities of the discussed devices.

In addition, the known solutions, including the prototype, allow bending at the end sections of the cables, in only one direction and do not have cable orientation nodes in space.

The present invention aims to achieve a technical result, which consists in increasing the efficiency for the ability to bend more complex and longer cables by freeing up space, moving the cable from a collision of a bent cable with moving elements of the device mechanisms.

The specified technical result is achieved by the fact that the device for 3-D cable bending, containing mounted on the frame of the cable feed mechanism and the cable bending mechanism, while the cable feed mechanism is a node for moving the cable along the guides to the cable bending mechanism, made in the form of two rollers, facing concave work surfaces towards each other to place the cable in the profile formed by the working surfaces of the rollers to bend this cable around the circumference of the working surface of one of the roles forged, equipped with a rotation mechanism of the cable bending mechanism, the cable bending mechanism is equipped with a rotation drive of one of the rollers, the cable feed mechanism includes at least two pairs of cams rigidly connected to the drive shaft, each pair of cams is 180 ° offset relative to the other and through pushers connected with transmitting pins located along the tube used to pull the cable, and associated with sliders made with grippers for moving the cable when the pushers interact with the working surface of the cams, the rotation mechanism of the cable bending mechanism is made in the form of a console on which the cable bending mechanism is fixed, which is rotatably mounted around the cable axis through a radial bearing, while the electric motors of the rotation mechanisms of the cable bending mechanism, the rotation of one of the rollers of the cable bending mechanism and the cam pair drive motor placed outside the zone of movement of the cable and its bending and are connected kinematically with the drive elements of the mechanisms.

The specified technical result is also achieved by the fact that the cable feed mechanism for the cable bending device includes two pairs of cams rigidly connected to the drive shaft, each pair of cams is 180 ° offset relative to the other and connected to transmitting pins located along the tube via pushers, used for pulling the cable, and associated with the sliders, made with grippers to cover the rubberized lips of the cable and move it when the pushers interact with the working surface of the cams.

These features are significant and are interconnected with the formation of a stable set of essential features sufficient to obtain the desired technical result.

The present invention is illustrated by a specific example of execution, which, however, is not the only possible, but clearly demonstrates the possibility of achieving the desired technical result.

In FIG. 1 shows a General view of the device for 3-D bending;

FIG. 2 is a section AA in FIG. 1, a plain bearing is shown;

FIG. 3 is a view A of FIG. one;

FIG. 4 shows a bending mechanism;

FIG. 5 is a section BB in FIG. four;

FIG. 6 is a kinematic diagram of a cable feed mechanism;

FIG. 7 - cable gripping unit of the cable feed mechanism.

According to the present invention, there is considered a design of a device for 3-D bending of a cable by the method of successive bends with rotation of the bending plane and feeding the cable along the axis from one bend point to the next.

In general, a device for 3-D cable bending comprises a cable feed mechanism mounted on a frame, a cable bending mechanism, and a rotation mechanism of the cable bending mechanism. The cable feed mechanism is a cable moving unit along the guide tube to the cable bending mechanism, made in the form of two rollers facing concave working surfaces towards each other to place the cable in the profile formed by the working surfaces of the rollers to bend this cable around the circumference of the working surface of one of the rollers,

The cable bending mechanism is equipped with a rotational drive of one of the rollers, the cable feed mechanism includes at least two pairs of cams rigidly connected to the drive shaft, each pair of cams is 180 ° offset from the other and connected to transmitting pins located along the tube via pushers, used for pulling the cable, and associated with the sliders made with rubber grips for moving the cable during the interaction of the pushers with the working surface of the cams.

The rotation mechanism of the cable bending mechanism is made in the form of a console on which a cable bending mechanism is mounted, which is rotatably mounted around the cable axis through a radial bearing.

And the electric motors of the mechanisms of rotation of the cable bending mechanism, the rotation of one of the rollers of the cable bending mechanism and the electric drive of the pair of cams are located outside the cable movement zone and are flexible and are kinematically connected with the drive elements of the mechanisms.

The following is an example embodiment of the invention.

A device for 3-D bending of the cable (hereinafter referred to as the device) consists of 3 functional units (feed mechanism 1, rotation mechanism 2, bending mechanism 3) as well as the frame 4 and the casing (not shown). The feed mechanism 1 moves the cable along its axis, providing the necessary distance between the bend points. The rotation mechanism 2 rotates the bending mechanism around the axis of the cable, providing the necessary angle of the plane of the bend. The bending mechanism 3 bends the cable to the desired angle.

In order to make the bending area as free as possible and minimize the possibility of a collision of the product (bent cable) with moving elements of the device mechanisms, all large-sized structural elements (drives) are removed from the bending area. The release of the bending area will allow bending of more complex, longer cables, which expands the technological capabilities of the device. To do this, the following activities.

- The feed mechanism is mounted on an elongated tube 5 (console), and the necessary forces are transmitted using transmitting pins 6 located in close proximity to the tube 5 and parallel to it. The drive is a cam software with an engine located outside the bending zone.

- The bending mechanism is mounted on the console of the rotation mechanism and receives the necessary effort from the shaft 7, located in the immediate vicinity of the console. The shaft 7 receives the necessary torque from the conical pair 8, and it, in turn, from the drive - the motor 9.

- The reactive force arising during bending is perceived by the radial bearing 10, which connects the console of the feed mechanism to the console of the rotation mechanism. This solution eliminates the inaccuracy of bending associated with the elastic movement of both the console of the rotation mechanism and the console of the feed mechanism, which increases the accuracy of the angle of bending.

Feed drive. From the shaft 11 with a system of cams 12 and 13 (Fig. 1), the reciprocating movement is transmitted to the studs 6; the movement of the studs 6 is converted by the feed mechanism 1 into the translational movement of the cable from one bend point to another. The feed mechanism is mounted on the tube 5.

The cable feed mechanism (FIGS. 6 and 7) consists of a cam program device that sets the law of operation of the mechanisms, which include two pairs of cams 12 and 13, sitting on the shaft 11 and receiving rotation from it. The cam software also includes transmitting pins 6 and cable gripping and pulling units. The cam mechanism (cam program device) is reversible, that is, it works both in one direction and in the other direction like a rack and pinion transmission.

The programmable device is a shaft 11 with two pairs of cams 12 (catch cams) and 13 (feed cams - feed). Each pair of cams controls its grip and pull unit and consists of a grip cam and cable pull cam. A pair of cams 12, conditionally controlling the first node of the grip and broach, differs from a similar pair 13 that controls the second node of the grip and broach in that it is 180 ° offset from the other. Thus, when one node of the grip and broach ends the broach and is ready to unclench the jaws 14 of the grip, the second node begins to clamp and pull the cable. In this case, the cable never remains free; it is always clamped by one or both of the gripping and pulling units, and when the shaft rotates, it always moves forward.

The studs 6 from the roller pushers (cams) receive a reciprocating movement according to the law specified by the corresponding cam, and transmit it to the gripping and pulling unit. With the cams 12 and 13 are connected pushers 14 connected to the transmitting studs 6 associated with the sliders of the grip 15 and broach 16.

The cable gripping and pulling unit (two of them) is a combination of six sliders, coupled to each other by a thorn-groove connection, through which forces are transmitted, forcing the corresponding movement of each part. Grip is as follows (Fig. 7).

The slider of the grip 15, restrained in the details of the housing 17 and 18, moves progressively from the stud 6 along the axis of the cable. The catch slider 15 is coupled to the sliders 19 and 20 with a thorn-groove connection with a direction at an angle to the cable axis. The sliders 19 and 20 are also associated with a part of the housing 17, allowing movement of the sliders 19 and 20 only perpendicular to the axis of the cable. The sliders 19 and 20 force the jaws 21 to close around the cable 21. The jaws 21 are connected to the sliders 19 and 20 with a thorn-groove connection that allows movement only perpendicular to the cable axis on one side and, with a slider 22 with a thorn-groove connection that only allows movement along the axis of the cable. Thus, the sliders 19 and 20 force the jaws 21 to close around the cable, clamping it, and the slider 22 forces the jaws 21 to translate along the axis of the cable. The slider 22, also bewildered in the details of the housing 17 and 18, forces the pin 23 to move.

Since the screen shell can be soft, it can be damaged (wrinkled) at high contact stresses. The crushing of the screen sheath is unacceptable, as this leads to a significant deterioration of the radio technical properties of the cable. It is to reduce contact stress that the jaws are rubberized at the point of contact.

The cable is bent by the bending mechanism 3 (Figs. 4 and 5), which is located on the console next to the end elements 24 of the feed mechanism 1 and is driven by a rotating shaft 7, which, in turn, receives rotational movement through a conical pair 8 from the electric motor 9 The cable is bent by planetary rotation of the roller 25 relative to the stationary roller 26. The rollers on the working surface have a profile that repeats the profile of the cable.

The angle of the plane of bending of the cable is changed using the rotation mechanism 27. The rotation mechanism is a worm pair 28 12 receiving rotational motion from the engine 29.

Design features of the device are:

a) the separation in space of the details of the bending mechanism 3 and the motor 9 and the relationship between them using the shaft 7 and the conical pair 8. This solution allowed us to reduce the distance between the points of inflection of the cable; which expanded the technological capabilities of the device.

b) a rigid connection between the console of the bending mechanism 3 and the console of the feed mechanism using a radial bearing 10, which does not allow the movement of these consoles and feed mechanisms and the bending mechanism relative to each other. This solution allowed to significantly increase the rigidity of the structure; increase the accuracy of the angle of bending of the cable, which improved the quality characteristics of the manufactured cables.

Claims (2)

1. A device for bending a cable, comprising a cable bending mechanism mounted on a frame, made in the form of two rollers, one of which is connected to a rotation drive facing concave working surfaces towards each other to accommodate the cable in the profile formed by the working surfaces of the rollers to bend this cable along the circumference of the working surface of one of the rollers, a console in the form of an elongated tube for moving the cable, a cable feed mechanism along said console to the cable bending mechanism, characterized in that about equipped with a rotation mechanism of the cable bending mechanism mounted on the console by means of a radial bearing rotatably around the cable axis, while this rotation mechanism of the cable bending mechanism is made in the form of a worm pair mounted on the console, and the electric motors of the rotation mechanism of the bending and rotation mechanism the bending mechanism rollers are located outside the cable movement zone and are bending and are kinematically connected with them. 2. The cable feed mechanism of the cable bending device, characterized in that it is made in the form of two pairs of cams, rigidly connected to the drive shaft, each pair of cams is 180 ° offset from the other and connected to the transmission studs for pulling the cable through the pushers, which are connected with sliders, made with grippers for covering the jaws of the cable and its movement during the interaction of the pushers with the working surface of the cams.

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