JP2928900B2 - External semiconductive layer cutting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an external semiconductive layer cutting device.

[0002]

2. Description of the Related Art In a rubber or plastic insulated power cable such as a CV cable, an outer semiconductive layer having a thickness of about 0.1 mm to 2.0 mm is coated on an insulating layer made of rubber or plastic. When connecting the power cable, it is necessary to remove the outer semiconductive layer of the cable terminal.
The outer semiconductive layer had been removed by hand shaving with a piece of glass by an operator.

[0003]

Therefore, there is a problem that the shaving state of the outer semiconductive layer greatly differs depending on the skill of the operator, which adversely affects the quality and performance of the power cable.

Accordingly, an object of the present invention is to provide an external semiconductive layer cutting device capable of eliminating variations in the cutting state of the external semiconductive layer and achieving a uniform quality.

[0005]

SUMMARY OF THE INVENTION The present invention, in order to achieve the above object, an outer semiconductive layer cutting device detachably attached to the power cable to expose the outer semiconductive layer, the electric power cable Reciprocate in the axial direction of
The outer semiconductive layer that can rotate around the axis of the power cable
And a brightness detector that detects the brightness of the cut portion of the external semiconductive layer, and compares the brightness detected by the brightness detector with a determination reference value. And a rotation feeder for intermittently driving the cutting head to rotate about the axis of the power cable based on a result of the determination by the brightness determiner.

[0006]

According to the present invention, the outer semiconductive layer can be cut by moving the cutting head in the axial direction of the power cable. At that time, the brightness of the cut portion of the outer semiconductive layer is detected by the brightness detector, and the brightness determination unit compares and determines the brightness detected by the brightness detector with the determination reference value. Until the remaining uncut portion of the external semiconductive layer determined based on the predetermined ratio, repeatedly cut in the axial direction,
Variations in the cutting removal state can be eliminated.

[0007] Based on the determination result of the brightness determination means,
If the cutting head is intermittently rotated by the rotary feed means and at each rotation position, the external semiconductive layer is cut in the axial direction,
The entire circumference can be cut.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments.

FIG. 1 is a sectional side view of an external semiconductive layer cutting device according to the present invention, and FIG. 2 exemplifies a sectional front view thereof.

In FIG. 1, reference numerals 1 and 1 denote a pair of cable holders arranged at a predetermined interval, which are detachably attached at a predetermined interval in the axial direction to a power cable 3 from which the external semiconductive layer 2 is exposed. Can be

As shown in FIGS. 1 and 3, the cable holder 1 has semicircular holder halves 4 and 4 along the outer periphery of the outer semiconductive layer 2.

The outer semiconductive layers 2 are formed by the holder halves 4 and 4.
, And the protruding pieces 5, 5 of the two holder halves 4, 4 are tightened with fixing members 6, such as bolts and nuts, which are omitted by dashed lines, and are fixed in a gripping state.

The power cable 3 includes a center conductor 7, a thick insulating layer 8 made of rubber or plastic (eg, crosslinked PE), and a thin outer semiconductive layer 2 of about 0.1 to 2.0 mm. And a sheath (not shown) that covers the outer semiconductive layer 2.
Is fixed to the external semiconductive layer 2, but one (left side in the figure) cable holder 1 may be fixed to the sheath. The outer semiconductive layer 2 is usually made of EVA, EEA or the like containing carbon black, and its hardness tends to be slightly lower than that of the crosslinked PE insulating layer 8.

As shown in FIGS. 1 and 2, each cable holder 1 is provided with a base block 9 connected thereto.
The pair of base blocks 9, 9 are connected by cylindrical slide shafts 10, 10 in the axial direction of the power cable 3.

The slide shafts 10 and 10 are arranged in parallel, and a screw shaft 11 parallel to the slide shaft 10 is provided at an intermediate portion thereof.
Are rotatably pivotally attached to the base blocks 9 and 9.

One end of the screw shaft 11 projects outward from one of the base blocks 9, and a timing pulley 12 is attached to the one end.

Further, a motor 13 is fixed to one base block 9, and a timing pulley 14 is attached to a rotation output shaft of the motor 13.

A timing belt 15 is wound around both timing pulleys 12 and 14 so as to mesh with each other.
The forward / reverse rotation of the screw shaft 11 causes the screw shaft 11 to rotate forward / backward around its axis.

The slide shafts 10 are provided with a frame 16.
A reciprocating plate 18 having a cutting head 17 and a reciprocating plate 18 is slidably mounted. The cutting head 17 is intermittently driven to rotate.

Specifically, the frame 16 has a plate-shaped base 19.
And a cylindrical boss 20 projecting from the base 19 in the axial direction.
The power cable 3 is inserted into the shaft hole 21 of the boss 20.
Is inserted.

At the lower end of the base 19, a pair of insertion holes 22, 22 is provided.
And a screw hole 23 are formed respectively. The slide shafts 10 and 10 are slidably inserted into the insertion holes 22 and 22, respectively.
The screw shaft 11 is screwed into 23.

Therefore, when the screw shaft 11 is rotated by the driving of the motor 13, the reciprocating plate 18 advances and retreats, and the slide shaft 10,
Move along 10. The motor 13, screw shaft 11, timing pulleys 12, 14, timing belt 15, and screw hole 23
Thus, the linear feed means 24 is configured.

At the other end of the screw shaft 11, a position detector 43 such as a rotary encoder is provided so that the axial position of the reciprocating disk 18 can be detected.

A stepping motor 25 is fixed to the upper end of the base 19, and a pinion gear 26 is mounted on a rotation shaft of the stepping motor 25.

Next, the cutting head 17 includes a cylindrical portion 27, a flange portion 28 projecting from one end of the cylindrical portion 27 in the outer radial direction,
Consists of

The inner peripheral surface of the cylindrical portion 27 is pivotally connected to the outer peripheral surface of the boss portion 20 via a bearing 29 so that the cutting head 17 can rotate around the axis of the power cable 3.

Further, a gear 30 is provided on the outer peripheral surface of the cylindrical portion 27, and a pinion gear 26 meshes with the gear 30.

Therefore, when the stepping motor 25 is driven to rotate by a predetermined angle, the cutting head 17 rotates by a predetermined angle via the pinion gear 26 and the gear 30. The stepping motor 25, the pinion gear 26, the gear 30, and the like constitute a rotation feed means 31.

On the end face of the flange portion 28 of the cutting head 17 and the end face of the base 19 of the frame 16, three auxiliary wheels 33 are provided via support members 32, respectively.

The auxiliary wheels 33 can roll on the outer peripheral surface of the outer semiconductive layer 2 in the axial direction thereof.
The power cable 3 is additionally supported during the 18 reciprocating movements.

Further, the cutting head 17 is provided with a cutting blade 34 so as to freely contact and separate from the outer semiconductive layer 2 from the outer diameter direction.

Specifically, a fluid cylinder 35 driven by hydraulic pressure or pneumatic pressure and a fluid cylinder 35
The slide member 36 which reciprocates in the radial direction by the drive is mounted, and the cutting blade 34 is fixed to the slide member 36 via a fixing member 37.

The cutting blade 34 is pressed against the outer semiconductive layer 2 from the outer diameter direction by driving the fluid cylinder 35, and the reciprocating moving plate
By moving 18 (cutting head 17) along the slide shafts 10, 10, the cutting blade 34 can cut the external semiconductive layer 2 in a band shape in the axial direction (see FIG. 6).

Reference numeral 38 denotes a pressing force detector for detecting the pressing force of the cutting blade 34 against the external semiconductive layer 2, and a load cell or the like is used.

The cutting blade 34 has a plate shape, and its cutting edge 39 is formed in an arc shape as shown in FIG. 4 or in a straight line as shown in FIG.

Then, as shown in FIG. 7, the pressing force of the cutting blade 34 against the external semiconductive layer 2 is controlled by the pressing force control means 47.
The predetermined value set by the setting device 48 is controlled.

The pressing force control means 47 includes a pressure proportional control valve 49,
A signal from the pressing force detector 38 is fed back to the pressure proportional control valve 49 to control the pressure of the fluid cylinder 35 and the pressing force of the cutting blade 34 to the pressure proportional control valve 49. It is kept at a predetermined value.

As shown in FIG. 1, a radial displacement of each part of the band-shaped cut portion R (see FIG. 6) of the external semiconductive layer 2 is provided on the end surface of the flange portion 28 via a mounting piece 40. A displacement sensor 41 that detects (for example, a cutting allowance) and a brightness detector 42 that detects the brightness of each part of the cut portion R are attached.
As the brightness detector 42, a color sensor or a reflection type optical sensor is used.

As shown in FIG. 6 and FIG.
Is white, and the external semiconductive layer 2 is black, so that the external semiconductive layer 2 is completely removed by cutting to expose the insulating layer 8 (white). And a (black) portion such as uncut portion of the outer semiconductive layer 2 (hereinafter referred to as an uncut portion M) can be detected by the brightness detector 42.

Based on the brightness data detected by the brightness detector 42, the brightness determination means 46 comprising a comparator 44 and a setting device 45 completes the cutting of the predetermined cut portion R in the external semiconductive layer 2. It is determined whether or not it has been done.

That is, by the comparator 44, the uncut portion M /
(Cut part S + non-cut part M), that is, the ratio of black / (white + black) and the determination reference value (for example, 5
%) And is compared, and if it is less than the judgment reference value,
It is determined that the cutting of the corresponding cut portion R has been completed.

The judgment result of the lightness judgment means 46 is based on the cutting control means.
If it is determined that the cutting has been completed, a command is given from the cutting control means 53 to the stepping motor 25, as shown in FIGS. 1, 6 and 7, and the cutting head 17 until the cutting portion R _1, it is driven to rotate with a preset angle of rotation.

The axial direction of the cutting head 17, ie, the cutting blade 34, corresponding to the black uncut portion M (detected by the position detector 43) in the brightness data detected by the brightness detector 42. The position is stored in the storage means 52.

The cutting control means 53 gives a command to the motor 13 and the pressure proportional control valve 49 to cut only the uncut portion M stored in the storage means 52.

Next, the displacement sensor 41 stores the radial position of each portion of the cut portion R before cutting, detects the displacement of each portion of the cut portion R after cutting, and detects the cutting allowance. .

The cutting allowance detected by the displacement sensor 41 is compared with the limit value of the cutting allowance set by the setting device 50 by the comparator 51. Regardless of the completion determination result, a command is given to the stepping motor 25 through the cutting control
The adapted to rotate to the next of the cutting site R _1.

In this way, excessive cutting of the insulating layer 8 can be prevented, and the required thickness can be secured, so that the use of high-voltage power is safe. In addition, it also functions as an alarm for abnormal irregularities on the cutting surface.

An example of a procedure for cutting the outer semiconductive layer 2 by the outer semiconductive layer cutting apparatus configured as described above will now be described.

The outer semiconductive layer 2 is connected to the cable holders 1, 1
When the apparatus is started in the state clamped by, the command is given to the motor 13 from the cutting control means 53 and the cutting blade 34
Moves in the axial direction while pressing the first cut portion R with a predetermined pressure, and cuts the outer semiconductive layer 2.

At the same time, the cutting allowance is detected by the displacement sensor 41 and the brightness is detected by the brightness detector 42.

When the outer semiconductive layer 2 is cut in the axial direction by a required length, the cutting blade 34 returns to the original position, the first cutting of the first cut portion R is completed, and the lightness judging means 46 It is determined whether or not the cutting has been completed, and the comparator 51 determines whether or not the cutting allowance has exceeded a limit value.

If the cutting allowance has not exceeded the limit value and the cutting has not been completed yet, the uncut portion of the first cut portion R will remain until the cutting allowance exceeds the limit value or the cutting is completed. Only M is pressed at a predetermined pressure by the cutting blade 34 and is repeatedly cut.

[0053] or cutting allowance exceeds the limit value, or if the cutting is completed, the cutting head 17 is rotated to the next of the cutting site R _1.

Then, the same procedure as described above is repeated,
The outer semiconductive layer 2 is cut over the entire circumference.

In the above-mentioned cutting procedure, there may be a case where the entire cutting portion R including the cutting portion S is repeatedly cut without repeatedly cutting only the uncut portion M.

As described above, when the power cable 3 is connected, the external semiconductive layer 2 of the cable terminal can be easily and automatically removed, thereby saving labor and labor.

At this time, in order to perform a cutting operation in a clean booth like a prefabricated joint, a portion to be cut is covered, and the cut pieces are collected to prevent environmental pollution due to residual foreign substances and the like.

Further, although the power cable 3 is subjected to a straightening operation for straightening by removing the curl of the drum or the bending at the time of pulling in before the connection, it is extremely difficult to make the power cable 3 completely straight. Therefore, even when the power cable 3 is not in a straight state at the time of cutting, the pressing force control means 47
By controlling the pressing force of the cutting blade 34 to a predetermined value, the external semiconductive layer 2 can be satisfactorily and smoothly cut and removed.

Furthermore, even if the thickness of the external semiconductive layer 2 is partially different or partially uneven,
Since only the memorized uncut portion M can be cut by the cooperation of the position detector 42 and the position detector 43, the cut portion S (insulating layer 8) is not cut excessively, and the uncut portion can be reliably eliminated. Becomes

[0060]

Since the present invention is configured as described above, the following significant effects can be obtained.

The brightness determination means 46 determines the completion of cutting of each cut portion R of the external semiconductive layer 2 of the power cable 3,
In addition, in cooperation with the rotary feed means 31, the external semiconductive layer 2 can be automatically cut in a predetermined cutting state over the entire circumference.

As described above, the external semiconductive layer 2 can be safely and automatically removed without manual operation, and the variation in the cutting and removing state of the external semiconductive layer 2 can be eliminated, so that the external semiconductive layer 2 has uniform quality. Can be finished.

[Brief description of the drawings]

FIG. 1 is a sectional side view showing an embodiment of the present invention.

FIG. 2 is a sectional front view.

FIG. 3 is a front view of the cable holder.

FIG. 4 is an enlarged front view of a main part of the cutting blade.

FIG. 5 is an enlarged front view of a main part of a modified example of the cutting blade.

FIG. 6 is a plan view showing a cutting state of an external semiconductive layer.

FIG. 7 is a block diagram showing an overall configuration.

[Explanation of symbols]

 2 External semiconductive layer 3 Power cable 17 Cutting head 31 Rotary feed means 42 Lightness detector 46 Lightness judgment means R Site to be cut

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tadashi Asai 8 Nishinocho, Higashikojima, Amagasaki City, Hyogo Prefecture Inside Mitsubishi Cable Industries, Ltd. (58) Field surveyed (Int.Cl. ⁶ , DB name) H02G 1/12

Claims (1)

(57) [Claims] 1. A An electric cutting machine is detachably attached to outer semiconductive layer in a power cable is exposed, the conjunction reciprocates in the axial direction of the power cable
The outer semiconductive layer that can rotate around the axis of the power cable
And a brightness detector that detects the brightness of the cut portion of the external semiconductive layer, and compares the brightness detected by the brightness detector with a determination reference value. An external semiconductive layer cutting device, comprising: lightness determining means; and rotation feed means for intermittently driving the cutting head to rotate about the axis of the power cable based on the determination result of the lightness determining means. .