JPH079545Y2 - Insulated wire chuck - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is intended for the purpose of pulling or temporarily fixing an electric wire during the installation work of an insulated electric wire, or for a tensile test of an insulator of an insulated electric wire. TECHNICAL FIELD The present invention relates to an insulated wire chuck used for wrapping an insulator from the outer periphery when the insulator and the conductor are separated from each other in the work of producing a tubular test piece used for the purpose.

[Prior Art] Conventionally, as a chuck for sandwiching an insulated wire, it is generally supported by an appropriate device so that one or the other approaches or departs from the other, and the insulator of the wire is sandwiched from the outer periphery by approaching 2 It is composed of one divided body, and a groove is formed at an opposing position of the opposing surface of the two divided bodies, and the outer periphery of the insulator is sandwiched by the groove.

In order to prevent the electric wire from slipping out of the groove when the electric wire is clamped, an uneven portion is formed on the inner surface of the groove of the split body in order to suppress slippage of the electric wire, and the clamped wire By digging the concave portion of the inner surface of the groove into the surface, the electric wire sandwiched by the split bodies is prevented from coming out of the groove.

The electric wire chuck is also used in the following cases. Since a large tensile force is applied to the wire that is pulled and wired and installed, if the tensile strength of the insulator covering the conductor is weak, the above-mentioned tensile force may crack the insulator and cause electrical leakage or other accidents. Insulators of insulated wires are required to have a set tensile strength because of the cause. Therefore, in order to confirm whether or not the insulator of the electric wire has a set tensile strength, an insulator having a predetermined length is extracted from the electric wire, a tubular test piece is prepared, and a tensile test is performed. In the production of the test piece of such an insulator, generally the electric wire is cut into a material for the test piece to a length of about 200 mm, the conductor of about 30 mm length is cut off from one end of the sample electric wire, and the conductor is exposed, Then, the insulator and the exposed conductor are sandwiched separately, and the insulator and the conductor are separated from each other to form a tubular insulator test piece. As a chuck for sandwiching this insulator, conventionally, like the above-mentioned chuck, generally, two chucks are supported so that one or the other approaches or departs from the other, and the insulator of the electric wire is sandwiched from the outer periphery so as to approach each other. It is made of a body, and a groove is formed at an opposing position of the opposing surface of the two divided bodies, and the groove holds the outer circumference of the insulator.

When sandwiching such an insulator, if the sandwiching force is strong, even the conductor inside the insulator is strongly tightened, so that it becomes difficult to pull out the conductor from the insulator, and if the sandwiching force is weak, the conductor will be pulled when the conductor is pulled. The insulator sandwiched by the groove slips out of the groove, and the insulator and the conductor cannot be separated.

Therefore, a concave-convex portion is formed on the inner surface of the groove of the divided body in order to suppress the sliding of the insulator, and the concave portion of the inner surface of the groove is made to bite into the surface of the sandwiched insulator to form the divided body. This prevents the sandwiched insulator from slipping out of the groove, so that the force of sandwiching the insulator by the split body does not need to be so strong.

[Problems to be Solved by the Invention] According to the above-described conventional insulated wire chuck, since the concave-convex portion is formed on the inner surface of the groove formed on the facing surface of the divided body,
When the insulator is sandwiched by the grooves of the divided body, the convex portion formed on the inner surface of the groove bites into the surface of the insulator, and the insulator sandwiched by the divided body is prevented from coming out of the groove. , The surface of the insulator is scratched due to the protrusion of the convex portion on the surface of the insulator, which is not preferable as a wire chuck for pulling or temporarily fixing the wire when installing an insulated wire, In addition, it is not preferable as a chuck for an electric wire when an insulator having a predetermined length is extracted from an electric wire to form a tubular test piece, and it cannot be used as a test piece for a tensile test. Therefore, in order to prevent the surface of the insulator from being scratched as much as possible, there is also a chuck having a smooth surface on which an uneven portion is not formed on the inner surface of the groove of one of the two divided bodies.
The adhesion strength of the insulator due to the groove varies, and it is not possible to prevent damage to the surface of the insulator.

As described above, according to the conventional insulated wire chuck, the outer circumference of the insulator is easily scratched, so that the work of separating the wire chuck and the insulator from the conductor requires careful work, resulting in poor workability. There is.

In view of the above points, the present invention chucks an insulated wire so as not to scratch the outer circumference of the insulator and to easily pull out the conductor when creating a chuck for the wire or a test piece for the insulator. That is the problem to be solved.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a plurality of encapsulating divided members that are supported so that one or the other approaches or departs from the other, and that approach and enclose from the outer circumference of an electric wire. Each of the plurality of encapsulating divided bodies is formed in a straight line with facing arc-shaped encapsulating grooves having a cross-sectional shape having a diameter corresponding to the outer diameter of the electric wire, and A soft rubber layer is provided on the inner peripheral surface of the groove, and a flange portion that does not reach the conductor even if it abuts the end surface of the insulator when the outer periphery of the wire is wrapped at one side end of the groove. It was provided so as to project inward.

Further, the projecting length of the flange portion projecting inward of the enclosing groove can be adjusted.

[Operation] This invention is composed of a plurality of packaging divisions that are supported so as to approach each other or one away from the other and wrap the electric wires from the outer periphery in close proximity to each other. On the opposing surface, arcuate wrapping grooves having a cross-sectional shape having a diameter corresponding to the outer diameter of the electric wire are formed to face each other, and a soft rubber layer is provided on the inner peripheral surface of the wrapping grooves. At the same time, since a flange portion, which comes into contact with the end face of the insulator when the outer circumference of the wire is wrapped but does not reach the conductor, is provided at one end of the wrapping groove so as to project inwardly of the groove, insulation is provided. When using it to make a body test piece, cut a wire to a length of 200 mm, cut an insulator of about 30 mm length from one end of the wire to form a sample with exposed conductor, and make a plurality of samples that approach the outer circumference of the insulator. The wrapping groove of the wrapping divided body is used to wrap the exposed conductor. The outer peripheral surface of the insulator by surface-contacting with the outer periphery of the insulator by causing the end surface of the insulator on the conductor side to be abutted against the collar portion by projecting from the side to the outside of the envelope. Since the frictional force with the soft rubber layer of the insulator is large, the movement of the insulator in the packing groove is effectively suppressed, and at the same time, since the end face of the insulator is in contact with the flange portion, the flange portion of the insulator Movement in the direction of the collar is blocked.

Therefore, when the conductor exposed from the insulator is pulled out, the force applied to the insulator is distributed to the outer circumference and the end surface of the insulator, so that the holding force of the insulator is sufficient even if the wrapping pressure of the insulator is small. Since the pressure received by the conductor from the insulator wrapped by the encapsulating divided body is small, the conductor can be easily pulled out from the insulative body, and further, the encapsulation groove between the insulating body and the encapsulating divided body. Since the contact with the soft rubber layer is a surface contact with the soft rubber layer, damage to the outer circumference of the insulator is prevented.

[Embodiment] Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

FIG. 1 shows an example of an insulated wire chuck according to the present invention. The chucks are supported by an appropriate device so that one or the other approaches or departs from the other, and insulates the wire A when approached. It is composed of two enclosing division bodies 1 and 2 enclosing the body B from the outer periphery. On each of the facing surfaces of the two encapsulating divided bodies 1 and 2, enclosing grooves 3 and 4 having a substantially semicircular cross section having a diameter corresponding to the outer diameter of the insulator B of the electric wire A face each other. And is linearly formed. Then, when the packaging divided bodies 1 and 2 are brought close to each other, the packaging grooves 3 and 4 formed on the respective opposing surfaces form a groove having a substantially circular cross section.

FIG. 4 shows another example of the insulated wire chuck according to the present invention. In the work of forming a tubular test piece used for a tensile test of the insulator of the insulated wire, the insulator and the conductor are separated from each other. Fig. 2 shows an insulated wire chuck used for wrapping an insulating material from the outer periphery during a pulling operation, the chuck being supported by an appropriate device so as to move toward or away from each other. Approaching the electric wire A
It is composed of two encapsulating division bodies 1 and 2 enclosing the insulator B of FIG. On each of the facing surfaces of the two encapsulating divided bodies 1 and 2, enclosing grooves 3 and 4 having a substantially semicircular cross section having a diameter corresponding to the outer diameter of the insulator B of the electric wire A face each other. And is linearly formed. Then, the inclusion divisions 1, 2
When they are brought close to each other, the inclusion grooves 3,
4 forms a groove having a substantially circular cross section. Soft rubber layers 5 and 6 are provided on the inner peripheral surfaces of the enclosing grooves 3 and 4, respectively. Further, when the outer circumference of the insulator B of the electric wire A is wrapped in the wrapping grooves 3 and 4 at one end side of the wrapping grooves 3 and 4, the end face C of the insulator B is contacted but does not reach the conductor D. That is, the collar portions 7 and 8 are provided so as to protrude toward the inside of the groove within the range of the thickness of the insulator B. This collar part
7 and 8 are formed separately from the covering divided bodies 1 and 2, and are fixed to one side ends of the covering grooves 3 and 4, that is, the end faces of the covering divided bodies 1 and 2 with bolts 9 and 10. The plate bodies 11 and 12 forming the collar portions 7 and 8 are formed with elongated holes 13 and 14 into which the bolts 9 and 10 are inserted,
By moving the plates 11 and 12 along the elongated holes 13 and 14, the protruding lengths of the collar portions 7 and 8 protruding into the grooves of the packaging grooves 3 and 4 can be adjusted.

Next, an example of use of the insulated wire chuck shown in the embodiment of FIG. 4 will be described.

First, a wire A is cut into a length of 200 mm and an insulator B is cut from the one end side by a length of 30 mm to expose a conductor D, and the insulator B of the wire A as a sample is moved toward and away from each other by an appropriate device. The conductor D is located between the encapsulation grooves 3 and 4 of the two encapsulation divided bodies 1 and 2 supported so as to enclose the conductor D from the collar portions 7 and 8 provided at one end of the encapsulation grooves 3 and 4. In the state that it is projected to the outside of the groove 3,4,
The encapsulating divided bodies 1 and 2 are brought close to each other, and the outer periphery of the insulator B is encapsulated by the encapsulating grooves 3 and 4, and this encapsulation is such that the end surface C on the side where the conductor D of the insulator B is exposed. The wrapping is performed so that the collars 7 and 8 provided at one end of the wrapping grooves 3 and 4 come into contact with each other (Fig. 7).

Then, the encapsulation grooves 3, 4 which come into surface contact with the outer periphery of the insulator B
Since the frictional force with the soft rubber layers 5 and 6 on the inner peripheral surface of the insulator B is large, the movement of the insulator B in the enclosing grooves 3 and 4 is effectively suppressed, and at the same time, the end face C of the insulator B is covered. Since it is in contact with the portions 7 and 8, the flange portions 7 and 8 prevent the insulator B from moving in the direction of the flange portions 7 and 8.

Therefore, when the conductor D exposed from the insulator B is pulled out, the force applied to the insulator B is distributed to the outer periphery of the insulator B and the end face C, so that the wrapping pressure of the insulator by the wrapping divided bodies 1 and 2 is increased. Has a sufficient holding force even if is small, and the pressure applied to the conductor D from the insulator B wrapped by the covering divided bodies 1 and 2 is small, the conductor D can be easily pulled out from the insulator B. Further, since the contact between the insulator B and the wrapping grooves 3 and 4 of the wrapping divided bodies 1 and 2 is surface contact with the soft rubber layers 5 and 6, the insulator B
It is possible to prevent damage to the outer circumference of the. FIG. 8 shows an example of a supporting device for supporting the packing division bodies 1 and 2 constituting the insulated wire chuck shown in the embodiment of FIG. 4 so as to approach and separate from each other. , The air cylinders 16, 17 are respectively provided at both longitudinal ends of the support plate 15 having a substantially rectangular shape.
Are provided so that the respective rods 18 and 19 face each other, and the covering divided bodies 1 and 2 can be attached to the tips of the rods 18 and 19 of the air cylinders 16 and 17 via the holders 20 and 21, respectively. Has become. And the air cylinders 16, 1
By operating 7 to move the rods 18 and 19 forward, the attachment divisions 1 and 2 approach each other, and at the central position of the support plate 15,
The insulator B of the electric wire A is wrapped from the outer periphery by the wrapping grooves 3 and 4 of the wrapping divided bodies 1 and 2. The holder 20,21
Are slidably engaged with the guide rails 22 and 23 and the guide grooves 24 and 25 that hold the moving direction of the holders 20 and 21, respectively. Reference numeral 26 is an air pipe connected to the air cylinders 16 and 17.

[Advantage of the Invention] As described above, according to the insulated wire chuck of the present invention, the invention is provided with a plurality of wrappings that are supported so that one or the other approaches or departs from each other, and that wraps the wires from the outer periphery in close proximity. A plurality of enclosing divisions, and on each of the facing surfaces of the plurality of enclosing divisions, arc-shaped enclosing grooves having a cross-sectional shape of a diameter corresponding to the outer diameter of the electric wire are formed to face each other, and A soft rubber layer is provided on the inner peripheral surface of the encapsulation groove, and a collar portion that comes into contact with the end face of the insulator when the outer periphery of the electric wire is encased at one end of the encapsulation groove but does not reach the conductor. Since it was provided so as to project toward the inside of the groove, when using it to make an insulator test piece, cut the wire to a length of 200 mm and cut it 30 mm from one end side.
Cut a long insulator and form a sample with exposed conductor,
The outer periphery of the insulator is wrapped with the wrapping grooves of a plurality of wrapping divisions that are close to each other, and in this wrapping, the conductor is projected from the flange side to the outside of the wrapping groove, and the end face of the insulator is wrapped. By wrapping so as to abut on the collar portion, the frictional force with the soft rubber layer on the inner peripheral surface of the wrapping groove, which makes surface contact with the outer periphery of the insulator, is large, so that insulation in the wrapping groove is performed. The movement of the body can be effectively suppressed, and at the same time, since the end face of the insulator is in contact with the flange portion, the movement of the insulator in the direction of the flange portion can be prevented by this flange portion. Therefore, when the conductor exposed from the insulator is pulled out, the force applied to the insulator is distributed to the outer circumference and the end surface of the insulator, so that the holding force of the insulator is sufficient even if the wrapping pressure of the insulator is small. Since the conductor receives a small pressure from the insulator wrapped by the wrapping division body, the conductor can be easily pulled out from the insulation body, and further, the wrapping of the insulation body and the division body can be achieved. Since the contact with the groove is the surface contact with the soft rubber layer, it is possible to prevent the outer periphery of the insulator from being damaged.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a right side view of the same as above, FIG. 3 is an explanatory view showing a state in which an electric wire is chucked, and FIG. 4 is another embodiment of the present invention. Front view,
FIG. 5 is a right side view of the same as above, FIG. 6 is a sectional view taken along line VI-VI of FIG. 4, FIG. 7 is an explanatory view showing a state in which the insulator of the electric wire is chucked, and FIG. 8 is shown in FIG. It is explanatory drawing of the support apparatus which attached the chuck shown. 1,2 …… Casting segment 3,4 …… Casting groove 5,6 …… Soft rubber layer 7,8 …… Crim part

Claims (2)

[Scope of utility model registration request] 1. A plurality of packaging divisions, which are supported so as to approach each other or one away from the other, and which closely surround and wrap the conductor of an electric wire from the outer periphery. On the opposite surface, arc-shaped packing grooves having a cross-sectional shape having a diameter corresponding to the outer diameter of the electric wire are formed to face each other, and a soft rubber layer is formed on the inner peripheral surface of the packing grooves. Insulation is provided by providing a collar portion, which is provided at one end of the wrapping groove and which abuts the end face of the insulator when the outer circumference of the wire is wrapped, but does not reach the conductor, inwardly of the groove. Electric wire chuck. 2. The insulated wire chuck according to claim 1, wherein a protruding length of a flange portion protruding inward of the enclosing groove is adjustable.