JP7171988B2 - Cable end processing device and cable end processing method - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable terminal processing apparatus and a cable terminal processing method for peeling off the covering of the terminal portion of a current-carrying cable made of, for example, a toothed belt to expose a conductor.

In general, cables for conducting electricity are processed to strip off the covering of the terminal part so that the conductor is exposed and electrical connection is possible. After cutting it to length, it is often the case that the end coating is stripped off using a special tool.

However, as disclosed in Patent Document 1, for example, a toothed belt having a structure in which a conductive core wire is embedded in a belt body made of urethane resin or the like may be used as a cable. When exposing the core wires of the belt, it is not possible to peel off the belt main body as a coating with a tool used for removing the coating of copper wires or the like.

On the other hand, as a method of peeling off the belt body from the end portion of the toothed belt as a cable, a method of dissolving the belt body with a solvent and removing the belt body, and a method of heating and softening the belt body and removing it are conceivable. Of these methods, the method using a solvent not only requires a lot of work time to remove the belt body, but also involves dangerous work due to the difficulty in handling the solvent. It can be said that it is more preferable to employ a method of softening.

JP 2017-202907 A

By the way, when the belt main body at the end portion of the toothed belt is removed by heating and softening it, the temperature of the end portion of the toothed belt is increased using a mold heated by a heater, and the bonding portion between the belt main body and the cord is removed. After softening the core wire, the core wire as a conductor is often exposed from the end of the cable by pulling out the core wire from the belt body at the terminal portion.

However, when the end portion of the toothed belt is heated from the outside using a mold, it tends to take a long time to heat the belt body to the extent that the core wire inside can be pulled out. Excessive softening of the entire belt body may cause quality deterioration, such as residual urethane resin on the pulled cords.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cable terminal processing apparatus and a cable terminal processing method capable of heating the covering of the terminal portion of a cable in a short period of time just enough to remove the covering to expose the conductor.

In order to achieve the above object, a cable terminal processing apparatus according to the present invention is for stripping off the covering of the terminal portion of a cable to expose a conductor, and includes an induction coil surrounding the terminal portion of the cable, and an induction coil surrounding the terminal portion of the cable. An AC power supply that inductively heats the conductor at the end of the cable by passing an alternating current through the induction coil, a cable end clamping part that clamps the end of the cable, and a cable end clamping part that clamps the center part of the cable. and a cable center clamp that is movable in a relatively spaced apart direction.

According to the above configuration, since an alternating current is passed through the induction coil to induction-heat the conductor at the end of the cable, the heat transferred from the conductor softens the bonded portion between the conductor and the surrounding coating at the cable end. can be done. Thereby, the conductor can be pulled out from the cover of the terminal part of the cable by separating the cable central holding part from the cable terminal holding part, and the conductor can be exposed by removing the covering from the cable terminal part.

Furthermore, since the conductor is heated by induction heating without heating the cable end portion from the outside, it is possible to soften the bonding portion between the conductor and the coating and shorten the time required to remove the coating. Moreover, since the conductor is directly heated, the entire coating can be prevented from being excessively softened, and the shape of the coating is maintained to facilitate the removal of the conductor, while the melted coating remains on the conductor. can be suppressed, and the quality of the cable after processing can be improved.

Here, induction heating is heating by causing a high-frequency alternating current to flow through an induction coil to generate an eddy current in a conductor inside the induction coil. Appropriate processing conditions can be set by controlling the frequency and value of the current, the material of the conductor, the cross-sectional area and number of conductors, the heating time, etc. as parameters.

In addition, in the above configuration, the cable end holding portion is movable in a direction in which the cable end holding portion is relatively separated from the cable end holding portion. You may be able to move to the direction spaced apart relatively.

That is, the present invention is a cable terminal processing apparatus for stripping the coating of the terminal part of a cable to expose a conductor, comprising an induction coil surrounding the terminal part of the cable and an alternating current flowing through the induction coil. An AC power source that induction-heats the conductor at the end of the cable, a central cable clamping portion that clamps the center of the cable, and a movement in a direction relatively away from the center clamping portion while clamping the end of the cable. and a flexible cable end holding part.

In addition, a coil holder for holding the induction coil on the outer peripheral side is provided, and this coil holder is formed into a columnar shape made of an insulating material, and an insertion hole into which the terminal portion of the cable can be inserted is formed in the end face of the coil holder. good too.

According to this configuration, since the induction coil is held on the outer peripheral side of the coil holder made of an insulating material, the end portion of the cable is stabilized when the conductor is induction-heated by inserting the end portion of the cable into the coil holder. can be positioned inside the induction coil.

Also, the coil holder may be equipped with a cable end holding portion.

According to this configuration, when the conductor is induction-heated, the cable end portion can be clamped by the cable end clamping portion, and can be positioned inside the induction coil in a more stable state. In addition, the conductor can be pulled out from the covering of the terminal part of the cable simply by holding and separating the central part of the cable by the cable central holding part after the conductor is induction-heated to soften the adhesion part with the covering. .

Alternatively, the coil holder may be provided with a central cable clamping portion, and the central cable clamping portion may be arranged outside in the direction of the center line of the induction coil.

According to this configuration, when the conductor is induction-heated, the center portion of the cable can be clamped in addition to the cable end portion, so that the cable end portion can be positioned inside the induction coil in a more stable state. In addition, the conductor can be pulled out from the covering of the terminal part of the cable only by separating the cable center clamping part from the cable end clamping part after softening the adhesion part between the conductor and the coating. can be tooled to facilitate on-site use.

Alternatively, the cable may be a toothed belt having core wires that can be energized.

According to this configuration, since the core wire of the toothed belt is used as a conductor and the belt main body is used as a coating to form a cable for conducting electricity, the coating can be stripped off with a tool used for a general cable for conducting electricity. Although not possible, by using the cable end processing apparatus of the present invention, the coating can be stripped off, and a preferred aspect of the present invention can be provided.

Also, as the induction coil, a plurality of coils may be arranged side by side in the central axis direction.

According to this configuration, the number of turns and the current value of each coil can be individually set to prevent unevenness in the temperature of the conductor being induction-heated. A desired distribution can be set. As a result, it is possible to set a suitable temperature distribution for stripping the coating, prevent processing troubles due to excessive heating or insufficient heating, and improve quality and productivity.

Also, a conductive cover may be provided to cover the central portion of the cable and block electromagnetic waves.

According to this configuration, the conductive cover is made of a metal such as iron that blocks electromagnetic waves, and the conductive cover covers and protects the central portion of the cable. can be prevented.

The present invention also provides a cable end processing method for stripping the coating from the end of the cable to expose the conductor.

That is, the present invention inserts the terminal portion of a cable inside an induction coil, and causes an alternating current to flow through the induction coil to inductively heat the conductor of the terminal portion of the cable, thereby removing the coating of the terminal portion of the cable. An induction heating step of softening the bonded portion with the conductor, and a clamping step of clamping the cable end portion with the cable end clamping portion and clamping the center portion of the cable with the cable center clamping portion, comprising an induction heating step; A cable characterized in that a pull-out process is provided after the clamping process, in which the cable central clamping part is moved in a direction away from the cable terminal clamping part, and the conductor is pulled out from the covering of the terminal part of the cable. A terminal processing method is provided.

Further, according to the present invention, by inserting the end portion of a cable inside an induction coil and passing an alternating current through the induction coil to inductively heat the conductor of the end portion of the cable, the coating of the end portion of the cable is An induction heating step of softening a portion bonded to a conductor; A cable characterized in that a pull-out step is provided after the clamping step, in which the cable end clamping portion is moved in a direction away from the cable center clamping portion, and the conductor is pulled out from the coating of the end portion of the cable. A terminal processing method is provided.

According to these configurations, it is possible to obtain the same effects as those obtained by adopting the configuration of the above-described cable end processing apparatus.

In the method of the present invention, either the induction heating step or the clamping step may be performed first. For example, the clamping step is provided after the induction heating step, and the end portion of the cable that has been induction-heated is taken out from the inside of the induction coil. It is also possible to sandwich the terminal portion and the central portion of the cable.

According to this configuration, after the terminal portion of the cable is induction-heated and taken out from the inside of the induction coil, the terminal portion and the central portion of the cable are clamped, and the conductor is pulled out from the covering of the terminal portion of the cable. Dedicated devices can be used for the induction heating and the drawing of the conductor from the coating, and each device can be elaborated and simplified accordingly.

Contrary to this, an induction heating process may be provided after the sandwiching process, and the conductor may be induction heated by sandwiching the cable ends and the central part with the cable ends being inserted inside the induction coils. .

According to this configuration, the end portion of the cable is induction-heated while the end portion and the center portion of the cable are sandwiched. The conductor can be pulled out from the covering of the part. As a result, a device for induction heating the cable end portion and a device for pulling out the conductor from the coating can be integrated to form a tool for stripping the coating on site.

Further, when the induction heating process is provided after the clamping process, the conductor may be induction-heated while a force is applied to the cable central clamping part in a direction to separate it from the cable terminal clamping part.

According to this configuration, induction heating is performed while applying a force that pulls the conductor out of the sheath at the terminal portion of the cable, so the conductor is pulled out of the sheath when the bonded portion between the conductor and the sheath softens sufficiently. . As a result, the cable end portion can be induction-heated as much as necessary, and the coating can be prevented from being excessively softened.

Also, a cutting groove may be formed in the coating at the boundary between the terminal portion and the central portion of the cable.

According to this configuration, since cut grooves are formed in the coating by, for example, laser processing, after induction heating, the cut grooves serve as boundaries, and the coatings of the cable central portion and the cable end portion can be easily separated. As a result, when the conductor is pulled out from the covering of the terminal portion of the cable, the covering of the terminal portion of the cable and the covering of the central portion can be separated at a preset accurate position.

As described above, according to the present invention, the conductor at the cable end is induction-heated to soften the adhesive portion between the conductor and the surrounding coating at the cable end, and the conductor is pulled out from the cable end, thereby removing the cable. The conductor at the end is exposed.

As a result, the covering of the end portion of the cable can be heated in a short time without excessive softening, and the time required for heating can be shortened, and the labor for temperature control can be omitted. Moreover, since excessive softening of the coating is prevented, it is possible to remove the coating without leaving it on the conductor. Work efficiency can be improved.

Furthermore, even when a toothed belt is used as a cable, the coating can be easily stripped off like copper wire, so a cable of a predetermined length with the cable ends stripped in advance is prepared. However, the cable can be cut to a desired length on site and the covering of the terminal portion can be stripped off without any need, and the versatility of the cable can be enhanced.

1 is a perspective view of an induction heating device in a cable end processing device according to the present invention; FIG. FIG. 2 is a perspective view of a drawing device of the cable terminal processing device according to the present invention; A diagram for explaining a cable terminal processing method according to the present invention.

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the cable terminal processing apparatus and cable terminal processing method which concern on this invention is demonstrated using drawing.

As shown in FIGS. 1 and 2, the cable terminal processing apparatus 1 is for stripping the coating 4 from the terminal portion 3 of the cable 2 to expose the conductor 5, and the conductor 5 of the terminal portion 3 of the cable 2 is removed. It is composed of an induction heating device 6 for induction heating and a drawing device 7 for drawing the conductor 5 from the coating 4 of the terminal portion 3 of the cable 2 .

The cable 2 is, for example, a toothed belt having an electrically conductive core wire such as a steel cord.

The induction heating device 6 includes a cylindrical coil holder 8 made of an insulating material such as synthetic resin or ceramic, an induction coil 9 configured by spirally winding an electric wire around the outer circumference of the coil holder 8, and an induction coil. and an AC power supply 10 for supplying an AC current to 9 .

An insertion hole 11 is formed in the end face of the coil holder 8 , and by inserting the terminal portion 3 of the cable 2 into the insertion hole 11 , the terminal portion 3 is surrounded by the induction coil 9 . In this state, the conductor 5 of the terminal portion 3 of the cable 2 is induction-heated by supplying an alternating current from the AC power source 10 to the induction coil 9 .

The pull-out device 7 includes a cable end clamping portion 12 that clamps the terminal portion 3 of the cable 2, and a cable that can move in a direction away from the cable end clamping portion 12 while clamping the central portion 13 of the cable 2. and a central clamping portion 14 .

The cable end clamping portion 12 is composed of a metal fixed side base portion 15 that is immovably installed and a metal fixed side lid portion 16 that is mounted on the upper surface side of the base portion 15. The fixed side base portion 15 and the fixed side lid portion 16, the terminal portion 3 of the cable 2 can be vertically sandwiched, and the sandwiched terminal portion 3 can be kept warm.

The central cable holding portion 14 includes a slider 18 movable along a rail 17 , a metal movable base portion 19 fixed to the upper surface of the slider 18 , and a metal base portion 19 mounted on the upper surface side of the movable side base portion 19 . The center portion 13 of the cable 2 is sandwiched vertically between the moving side base portion 19 and the moving side lid portion 20 .

Next, a method for processing a cable end using the above cable end processing apparatus will be described.

First, as a preliminary preparation, a toothed belt is cut to a desired length and width to form a cable 2, and a cut groove 21 is formed in the coating 4 at the boundary between the terminal portion 3 and the central portion 13 by, for example, laser processing. to form

Next, as an induction heating step, the end portion 3 of the cable 2 is inserted into the insertion hole 11 of the coil holder 8 of the induction heating device 6 to insert the end portion 3 inside the induction coil 9, and in this state, , a high-frequency alternating current is supplied from the alternating current power supply 10 to the induction coil 9 for, for example, several seconds. As a result, a high-frequency alternating magnetic field is generated inside the induction coil 9, the conductor 5 of the terminal portion 3 is induction-heated by eddy current, and heat transfer from the conductor 5 heats the conductor 5 of the covering 4 of the terminal portion 3. The adhesive portion with the is softened, and its adhesive strength is reduced (see FIG. 3(a)).

As a sandwiching step, after the induction heating step, the terminal portion 3 of the cable 2 that has been induction-heated is taken out from the induction heating device 6, and the terminal portion 3 and the central portion 13 of the cable 2 are respectively sandwiched by the cable terminal sandwiching portion 12 and the cable central sandwiching portion. It is sandwiched by the portion 14 . At this time, the terminal portion 3 is vertically sandwiched between the fixed side base portion 15 and the fixed side lid portion 16 of the cable terminal sandwiching portion 12, and the movable side base portion 19 and the movable side lid portion of the cable central sandwiching portion 14 are held. The central part 13 is vertically sandwiched between the central part 13 and 20, and the sandwiched terminal part 3 is kept warm.

After the clamping step, the slider 18 of the cable center clamping portion 14 is moved along the rail 17 to the cable end clamping portion 12 in a state where the bonding strength of the bonding portion between the coating 4 and the conductor 5 of the terminal portion 3 is reduced. move away from As a result, as the slider 18 moves, the moving-side base portion 19 and the moving-side lid portion 20 that clamp the central portion 13 of the cable 2 are separated from the cable end clamping portion 12, and the coating 4 is separated at the position of the cut groove 21. After being torn, the conductor 5 is pulled out from the cover 4 of the terminal portion 3 sandwiched between the fixed base portion 15 and the fixed lid portion 16, exposing the conductor 5 of the terminal portion 3 of the cable 2 (see FIG. 3 ( b) see).

After that, the exposed conductor 5 is insulated with a shrinkable tube made of an insulating material, a caulking material such as hot melt, an insulating tape, or the like. At that time, depending on the purpose of use, a plurality of parallel conductors 5 are twisted together at the portion where the coating is removed to increase the scar so that the desired conductor resistance value is obtained, and then wrapped with a shrinkable tube. Just do it.

Furthermore, after attaching a part such as a crimp terminal or a connector that enables electrical wiring and electrical connection to the tip of the exposed conductor 5, the processed part is subjected to electrical inspection such as continuity, withstand voltage, insulation, resistance value, etc. After quality inspection including, cable end processing is completed.

According to the above configuration, for example, induction heating is used as a means for heating the end portion 3 of the toothed belt as the cable 2, and the core wire as the conductor 5 is heated without passing through the belt main body as the coating 4 at the end portion 3. is heated directly. Furthermore, by transferring the heat of the conductor 5, the bonded portion of the coating 4 and the conductor 5 is softened, and then the conductor 5 is pulled out from the coating 4 of the end portion 3 to expose the conductor 5 from the cable end. .

As a result, the bonding portion can be softened, for example, in a few seconds, and the processing time for the cable end can be greatly shortened. Residual adhesion can be suppressed, the labor of removing the resin adhering to the conductor 5 can be omitted, and workability in processing the cable 2 can be greatly improved. Furthermore, items that can be easily managed, such as the heating time and the number of conductors 5, can be used as parameters, making it easy to adjust the processing conditions.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications can be made as appropriate within the scope of the present invention. For example, instead of providing the clamping step after the induction heating step, the induction heating step may be provided after the clamping step. The conductor 5 may be induction-heated after the end portion 3 and the central portion 13 of 2 are sandwiched.

When the induction heating process is provided after the clamping process, in order to clamp the terminal part 3 of the cable 2, the cable terminal clamping part 12 is formed of an insulating material such as synthetic resin or ceramic, and is mounted on the coil holder 8. Just do it. Further, in order to clamp the central portion 13 of the cable 2 , the cable central clamping portion 14 may be provided so as to be positioned outside the induction coil 9 of the coil holder 8 . As a result, the cable terminal processing device 1 can be miniaturized to constitute a handy tool that can be used on-site.

Further, the conductor 5 may be induction-heated while a force is applied so as to separate the cable end clamping portion 12 from the cable end clamping portion 12 . As a result, the conductor 5 is automatically pulled out when the bonded portion is softened to the necessary minimum, so that the induction heating is minimized, the heating time is shortened as much as possible, and the residual adhesion of the resin to the conductor 5 is minimized. can be minimized.

Alternatively, the induction coil 9 may be configured by arranging a plurality of coils in parallel in the central axis direction. For example, by arranging three coils in the direction of the central axis, lowering the current value of electricity flowing through the central coil where the conductor 5 is likely to be heated, and increasing the current value of electricity flowing through the coils on both sides, the end of the cable 2 The conductor 5 of the portion 3 can be uniformly heated along its length. Besides the current value, the temperature distribution of the induction heating can be controlled by the heating time and the number of turns of the coil.

Only the portion inserted into the induction coil 9 can be softened by induction heating, but the central portion 13 of the cable 2 may be covered with a conductive cover to block electromagnetic waves. . As a result, the conductor 5 in the central portion 13 where the covering 4 is left is induction-heated, and softening of the bonded portion thereof can be more reliably prevented, and the quality of the cable 2 after terminal processing can be improved. .

REFERENCE SIGNS LIST 1 cable terminal processing device 2 cable 3 terminal portion 4 coating 5 conductor 6 induction heating device 7 extraction device 8 coil holder 9 induction coil 10 alternating current power supply 11 insertion hole 12 cable terminal clamping portion 13 center portion 14 cable center clamping portion 15 fixed side Base part 16 Fixed side cover part 17 Rail 18 Slider 19 Moving side base part 20 Moving side cover part 21 Cutting groove

Claims (14)

A cable terminal processing device for stripping the covering of the terminal part of a cable to expose a conductor,
an induction coil surrounding the end of the cable; an alternating current power supply for inductively heating the conductor at the end of the cable by passing an alternating current through the induction coil; a cable end clamping part for clamping the end of the cable; A cable end processing device, comprising: a cable center clamping portion that clamps a center portion and is movable in a direction away from the cable end clamping portion. A cable terminal processing device for stripping the covering of the terminal part of a cable to expose a conductor,
an induction coil surrounding the end of the cable; an alternating current power supply for inductively heating the conductor at the end of the cable by passing an alternating current through the induction coil; a central clamping portion for clamping the center of the cable; A cable terminal processing device, comprising: a cable terminal clamping section that clamps the terminal section and is movable in a direction in which the terminal section is relatively separated from the cable center clamping section. A coil holder is provided for holding the induction coil on the outer peripheral side, and the coil holder is formed in a columnar shape made of an insulating material, and an insertion hole is formed in an end face thereof into which a terminal portion of a cable can be inserted. 3. The cable end processing device according to claim 1 or 2, characterized in that: 4. The cable terminal processing apparatus according to claim 3, wherein the coil holder is provided with the cable terminal clamping portion. 5. The cable end processing apparatus according to claim 4, wherein the coil holder is provided with the cable center clamping portion, and the cable center clamping portion is arranged outside in the center line direction of the induction coil. 6. The cable end processing apparatus according to claim 1, wherein the cable is a toothed belt having a conductive core wire. 7. The cable terminal processing apparatus according to claim 1, wherein a plurality of coils are arranged in parallel in the central axis direction as the induction coil. 8. The cable end processing apparatus according to claim 1, further comprising a conductive cover that covers the central portion of the cable and blocks electromagnetic waves. A cable terminal processing method for stripping the coating of the terminal part of the cable to expose the conductor,
The end of the cable is inserted inside the induction coil, and an alternating current is passed through the induction coil to heat the conductor of the end of the cable by induction, thereby removing the portion of the coating of the end of the cable that is bonded to the conductor. An induction heating step for softening; and a clamping step for clamping the cable end portion by the cable end clamping portion and clamping the center portion of the cable by the cable center clamping portion. 1. A cable terminal processing method, comprising: a pulling step of moving a central clamping part in a direction away from a cable terminal clamping part to pull out a conductor from a coating of the terminal part of the cable. A cable terminal processing method for stripping the coating of the terminal part of the cable to expose the conductor,
The end of the cable is inserted inside the induction coil, and an alternating current is passed through the induction coil to heat the conductor of the end of the cable by induction, thereby removing the portion of the coating of the end of the cable that is bonded to the conductor. and a clamping step of clamping the center portion of the cable by the cable center clamping portion and clamping the terminal portion of the cable by the cable terminal clamping portion. 1. A method of processing a cable terminal, comprising a pulling step of moving the terminal clamping part in a direction away from the cable center clamping part to pull out the conductor from the covering of the terminal part of the cable. 10. The clamping step is provided after the induction heating step, wherein the terminal portion of the cable that has been induction-heated is taken out from the inside of the induction coil, and the terminal portion and the central portion of the cable are clamped. 11. The cable terminal processing method according to 10. The induction heating step is provided after the clamping step, wherein the terminal portion and the central portion of the cable are clamped with the terminal portion of the cable inserted inside the induction coil, and the conductor is induction-heated. The cable terminal processing method according to claim 9 or 10. 13. The cable terminal processing method according to claim 12, wherein the conductor is induction-heated while a force is applied to the cable central clamping part in a direction to move the cable terminal clamping part away from the cable terminal clamping part. 14. The cable terminal processing method according to any one of claims 9 to 13, wherein a cutting groove is formed in the covering of the boundary between the terminal portion and the central portion of the cable.

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