JPH09270291A - Cold-welding connecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cold-welding connecting device provided with all of automatic or semi-automatic function of removing a coating of an electric wire, clod-welding, deburring a connected portion, testing strength of the connected portion, and applying insulation to the connected portion. SOLUTION: A cold-welding connecting device comprises: a coating removing unit A for automatically peeling off a coating at an end of an electric wire; a press-contacting, deburring and screening unit B provided with a function of making the ends of a coating-removed conductor abut against each other so as to automatically connect them by cold-welding, function of automatically removing a burr generated by welding connection, and a function of automatically inspecting strength of the welding connected portion; and a heating unit C for contracting an insulating tube applied onto the welding connected portion so as to bring it into close contact with the electric wire.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold pressure welding apparatus used for connecting a covered electric wire such as a communication cable.

[0002]

2. Description of the Related Art The work of connecting a covered electric wire is carried out by the steps of removing the end covering portion of the electric wire, connecting the exposed conductor, and insulating the connection. Conventionally, the work of connecting a covered electric wire having a relatively small diameter, such as an insulating core wire of a communication cable, has been performed as follows. (1) The removal of the coating on the end of the electric wire is performed manually using a nipper or a coating remover, and (2) the conductor is connected by pressure welding using a solder connection or a manual pressure welding tool. (3) For insulation of the connection part, a tube filled with an insulating mixture is used, or a heat-shrinkable tube is heat-shrinked to be closely attached to the electric wire. When the conductor connection of the above (2) is performed by pressure contact connection, the generated burr is not removed, and the burr is removed by hand using a nipper or the like. Currently, no strength inspection is performed.

[0003]

In the above-mentioned conventional work for connecting a covered electric wire, there are the following problems. (1) Since the coating on the end of the wire is manually removed using a coating remover, the length of the coating removal is not constant and the conductor may be damaged. (2) Solder connection or pressure contact connection using a manual pressure contact tool has a large degree of fatigue in the case of multiple cores, and solder connection requires skill. (3) Since the burr is not removed, the connection portion becomes thick. Further, when the burr is manually removed using a nipper or the like, fatigue is great. (4) Since the strength inspection of the connection portion is not performed, if there is a connection failure, especially in the case of a communication cable, the connection failure is fatal, and it is difficult to identify the broken point. (5) Since the tube filled with the insulating mixture for insulating the connection portion is manually crimped, the crimpability is not stable and there is a problem in the insulation treatment.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and, of course, removes the coating from the end of the wire and insulates the connection.
(EN) Provided is a cold pressure welding connection device capable of removing burrs at the time of pressure welding connection and performing strength inspection of the pressure welding connection part by one device. The coating removal part to be removed, the function to automatically connect the ends of the conductors from which the coating has been removed by butt cold welding, the function to automatically remove the burrs generated in the pressure welding connection part, and the strength inspection of the pressure welding connection part automatically A cold pressure connection device composed of a pressure welding, deburring, screening section with a screening function, and a heating heater section that heat-shrinks an insulating tube applied on the pressure connection section to bring it into close contact with the wire. is there.

[0005]

1 is a top view of a specific example of the cold pressure welding connection device of the present invention. As shown in the drawing, the motor 1
And a coating removing section A having a coating stripping machine 3 connected to both sides thereof via a coupling 2, a die 21, a V block 2
2, pressure contact connection part 2 having pressure contact lever 23, fingers 24, etc.
0 and a screening unit B and a heater C having fixed clamps 31 and movable clamps 32 located on both sides thereof.
It consists of.

FIG. 2 is an explanatory view of the coating removing section A, and FIG.
(A) is a vertical cross-sectional view of the main part, and FIG. 2 (b) is X in FIG. 2 (a).
₁ -X ₁ is a view on arrow. As shown in the drawing, the coating stripping machine 3
One frame 6a of the rotary drum 6 is coupled to the coupling 2
Is connected to the motor 1 via the motor, and the coating stripping machine 3 rotates in synchronization with the rotation of the motor 1. The rotating drum 6
An inner mouth 5 having a guide groove for the electric wire W is provided outside the other frame 6b, and a cutter arm 9 provided inside the frame 6b is provided with a cutter 7 capable of circular movement by a cutter pin. . Further, a pressing spring 10 is provided by fixing one end to the cutter 7 and the other end to the lower portion of the frame 6b.
The holding spring 10 controls the circular movement of the cutter 7, and thereby the tip of the cutter 7 can be positioned in accordance with the diameter of the electric wire W.

When removing the coating on the end of the wire W, the wire W
Is introduced into the rotary drum 6 through the mouse 4 (see FIG. 1) provided on the side wall of the outer box of the apparatus and the inner mouse 5 of the coating stripper 3, and the tip thereof is abutted against the frame 6a of the rotary drum 6.
Thereby, the coating removal length of the electric wire W is always kept constant. By operating the motor 1 in this state, the coating stripper 3 also rotates synchronously, and the coating is cut into a circumferential shape. In this state, the electric wire W is pulled out by hand while the motor 1 is rotated, so that the coating of a predetermined length is removed without resistance. At this time, the cutter arm 9 is movable around the pin 9a as a fulcrum, which prevents the cutter 7 from biting into the electric wire W during extraction.

FIG. 3 is an explanatory view of the pressure contact portion and the screening portion B of the cold pressure contact connection device of the present invention, and FIG. 4 is X ₂ -X in FIG.
FIG. _{2 is a} sectional view. As shown in FIG. 1, the press contact connecting portion 20 includes a die 21, a V block 22, a press contact lever 23, and fingers 24. The conductor w (see FIG. 5) exposed by removing the end coating of the electric wire W is held by the fingers 24, and the tip thereof is positioned inside the die 21. By operating the motor 25 in this state, the rotation is transmitted to the pressure contact cam 28 via the gear 26, the gear 27 and the torque limiter 29. The rotation of the pressure contact cam 28 causes the pressure contact lever 23 to operate intermittently, and the V block 22
The conductor is repeatedly pressed and pressed by the die 21 gripped by. Subsequently, the fingers 24 are opened, the pressure-welded electric wire is gripped by the moving clamp 32, and automatically moved in the length direction in the die 21, whereby burrs generated at the tip of the die during pressure welding can be removed.

As described above, after performing the pressure contact connection and deburring of the electric wire, the electric wire is fixed to the fixed clamp 31 and the movable clamp.
Grip it to 32 and test the strength of the connection. When the motor 33 is operated, its rotation is transmitted to the feed screw 36 via the gears 34 and 35, and the slide table 37 moves in the arrow (right direction) in the figure. Along with this, the clamping action of the screening spring 39 located in the clamp table 38 also causes the clamp table 38 to move in the arrow direction (to the right, and the moving clamp 32 fixedly provided on the table 38 also moves, A tension test can be performed by applying tension to the press-connecting connection part. The magnitude of the tension applied to the press-connecting connection part depends on the tension setting sensor installed on the clamp table 38.
40 (see FIG. 1).

After confirming the goodness of the press-connecting connection portion by the above-mentioned strength test, the insulating tube previously inserted through one electric wire is returned to the connection portion and mounted on the heater C to heat the connection tube. Insulate by shrinking and sticking to the wire.

The reliability of the pressure-welded connection portion of the electric wire can be confirmed by the above-described strength test and the pushing amount required for the crimping shown in FIGS. 5A to 5C (movement amount of the electric wire pushed in the crimping). It is also possible to carry out the method of detecting the above, and by using both in combination, the effect becomes more certain.
FIG. 5A shows the amount of movement of the coated end of the electric wire W due to pressure contact,
This is a method of detecting with a photoelectric sensor 51 installed at a preset position. In addition, in the method of FIG. 5B, when the coating on the end of the wire is removed, coloring 52 is applied to the removed coating end, and the coloring 52 is detected by the visual sensor 53, and the amount of movement is determined. A way to know. Further, in FIG. 5C, a roller 24 'having a one-way bearing 24'a for controlling the rotation direction is provided on the finger of the pressure contact connection portion, and the rotation amount of the roller 24' is read by a rotary potentiometer or an encoder, etc. Is a method of detecting the amount of movement of the. In the drawings,
w indicates the conductor with the coating removed.

[0012]

As described above, the cold pressure welding connection device of the present invention has the functions of removing the coating of the wire, cold pressure welding, deburring of the connection portion, strength test of the connection portion, and insulation treatment of the connection portion. It is equipped with one device, and these operations can be performed automatically or semi-automatically. Therefore, when used in the field of connection work such as communication cables, it is extremely effective in improving workability and quality.

[Brief description of drawings]

FIG. 1 is a top view of a specific example of the cold pressure connection device of the present invention.

2 is an explanatory view of a coating removing unit of the device of the present invention, and FIG.
(A) is a vertical cross-sectional view of the main part, and FIG. 2 (b) is X in FIG. 2 (a).
₁ -X ₁ is a view on arrow.

FIG. 3 is a configuration diagram of a pressure welding / screening unit of the device of the present invention.

FIG. 4 is a sectional view taken along line X ₂ -X _{2 of} FIG.

5A to 5C are explanatory views of a method for detecting the amount of movement of an electric wire.

[Explanation of symbols]

 A Coating removal part B Pressure contact, screening part C Heating heater part 1 Motor 2 Coupling 3 Coating removal machine 4 Mouse 5 Inner mouse 6 Rotating drum 7 Cutter 8 Cutter pin 9 Cutter arm 10 Presser spring 20 Pressure contact connection part 21 Die 22 V block 23 Pressure contact lever 25 Motor 26, 27 Gear 28 Pressure contact cam 29 Torque limiter 31 Fixed clamp 32 Moving clamp 33 Motor 34, 35 Gear 36 Feed screw 37 Slide table 38 Clamp table 39 Screening spring 40 Tensile force setting sensor

Claims (1)

[Claims] 1. A coating removing portion for automatically stripping an end coating portion of an electric wire, a function of automatically press-connecting an end portion of a conductor whose coating has been removed in a butt cold state, and a press-connecting connection portion. With a function to automatically remove burrs and a screening function to automatically perform strength inspection of the pressure welding connection, the insulation tube provided on the pressure welding, screening portion, and pressure welding connection is heat-shrinked to adhere to the wire. A cold pressure connection device comprising a heater part.