JP2005074543A - Connection sleeve and wire saw - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safe connection sleeve which is prevented from flying when a wire rope is broken at a part of the connection sleeve caused by the occurrence of abnormal force during working in a diamond wire saw used for cutting a stone material and concrete or the like, and also to provide a safe wire saw connected by the connection sleeve. <P>SOLUTION: The connection sleeve for the diamond wire saw is characterized in that it has a dividing means at its nearly central part. The connection sleeve has the dividing means at the nearly central part in the wire saw in which both end parts of the wire rope are inserted to the connection sleeve in an opposing state from both lateral sides and connected in an endless state by the caulking of the connection sleeve. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a connection sleeve and a wire saw for connecting a diamond wire saw used for cutting stone or concrete in an endless state. More particularly, the present invention relates to a safe connection sleeve in which the connection sleeve does not fly when the wire rope breaks at the connection sleeve, and a safe wire saw connected by the connection sleeve.

A wire saw in which cylindrical beads with superabrasive grains fixed and attached to a wire rope in a rosary shape are wound around a cutting object such as stone or concrete in an annular shape, and 25 to 40 m / s by a wire saw driving machine. The object is cut by winding at a high speed. The wire saw method can cut large reinforced concrete, can cut complex shapes, has low noise, vibration, and dust, has excellent environmental characteristics, and can cut underwater structures and high-rise structures by remote control. Since it is possible and the work efficiency is high, it is suitable for work with severe time constraints.
A connecting sleeve is used to connect both ends of the wire rope of the wire saw to form an endless annular shape. FIG. 1 is a partial cross-sectional view showing an example of a connecting portion of a wire saw. Both ends 1 and 2 of the wire rope are cut with a wire cutter so that the cut surface becomes a smooth surface perpendicular to the length direction of the wire, and the covering material is removed from the cut surface to a predetermined position to remove the wire rope. To expose. Next, the wire rope is inserted from both ends of the connection sleeve 3 so that the end surfaces of the wire rope are in contact with each other at the center of the connection sleeve and the wire rope is not exposed between the connection sleeve and the bead 4. In this state, the connecting sleeve is set on a die of a manual hydraulic press, the pressure handle is operated, and crimping is performed by caulking the connecting sleeve to connect both ends of the wire rope to complete an endless wire saw.
Previously, it was considered preferable that the strength of the wire rope connection was high. For example, when a sleeve is fitted to both ends of a wire via hard abrasive grains, and the caulking is stopped, the hard abrasive grains bite into both the wire and the sleeve, and the wire-to-sleeve bonding action becomes extremely strong. A structure has been proposed (Patent Document 1). However, if the connection part of the wire rope is strong, the breaking point of the wire saw cannot be predicted, and if an abnormal load is applied to the wire rope during the cutting operation, the wire rope breaks or the wire saw drive machine is damaged. It has come to be considered dangerous. For this reason, in recent years, the connection sleeve of the wire rope has been replaced at regular intervals, and in the unlikely event that the wire saw breaks, a device has been started so that the wire rope can be removed by the connection sleeve.
For example, as a wire saw having a high holding force and high safety, circumferential grooves having different shapes on the left and right sides are formed on the inner surface of the connection sleeve so that a difference occurs between the holding force for one of the wire ropes and the holding force for the other. A formed wire saw has been proposed (Patent Document 2). In addition, the present inventor provides a highly safe wire saw having a high holding force between the connection sleeve and the wire rope, and has the same inner diameter as an easy-to-manufacture connection sleeve. A connection sleeve having a ratio of an outer diameter to a larger outer diameter of 0.85 to 0.95 has been proposed (Patent Document 3). If the wire rope is connected with this connection sleeve and the part with the larger outer diameter is positioned behind the wire saw rotation direction, when the wire saw comes out of the connection sleeve, the front wire saw jumps like a whip. Even so, the connecting sleeve remains on the rear side and is prevented from scattering. By using such a connection sleeve, the danger at the time of breaking the wire saw can be reduced, but it has not been possible to completely prevent the beads from falling off from the wire rope on the front side where the connection sleeve does not remain. .
Japanese Utility Model Publication No. 6-1296 (page 1-2) Japanese Patent No. 270083 (page 1-2) Japanese Patent No. 3448046

  The present invention is a diamond wire saw used for cutting stones, concrete, and the like. When the wire rope breaks at the position of the connection sleeve due to an abnormal force generated during the operation, the connection sleeve does not fly. The purpose of the present invention is to provide a secure connection saw and a safe wire saw connected by the connection sleeve.

As a result of earnest research to solve the above problems, the present inventor has provided a dividing means at a substantially central portion of the connection sleeve, and the wire breaking rope connected to the tensile breaking strength of the dividing means by caulking of the connection sleeve. By making it smaller than the pulling strength of the wire, the connection sleeve breaks at the dividing means, and the wire rope does not come out of the connection sleeve, leaving the connection sleeve on both sides of the breakage point, preventing the beads from scattering and dropping off from the wire rope Based on this finding, the present invention has been completed.
That is, the present invention
(1) A connecting sleeve of a diamond wire saw, wherein the connecting sleeve has a dividing means at a substantially central portion of the connecting sleeve,
(2) The connection sleeve according to item 1, wherein the dividing means is a circumferential groove and / or hole provided on the outer periphery of the connection sleeve;
(3) The connection sleeve according to the first item, wherein the tensile breaking strength of the dividing means is 5 to 10 kN, and
(4) In a wire saw in which both end portions of the wire rope are inserted into the connection sleeve so as to face each other from both the left and right sides and connected in an endless state by caulking of the connection sleeve, the connection sleeve has a dividing means at a substantially central portion. Features wire saw,
Is to provide.

  In the connection sleeve and the wire saw of the present invention, the wire rope does not come out of the connection sleeve. Therefore, the connecting sleeve does not come out of the wire rope and jump out, and the beads are not scattered or dropped off, which is extremely safe. Further, when the broken portion is connected using a new connection sleeve, all the beads remain in a predetermined position of the wire rope, so that the wire saw can be easily connected in a short time and the operation can be resumed. The connection sleeve of the present invention can be easily manufactured from a metal material by a simple work.

The connection sleeve according to the present invention is a connection sleeve having a dividing means at a substantially central portion of the connection sleeve of the diamond wire saw. In the connection sleeve of the present invention, it is preferable that the dividing means is a circumferential groove and / or hole provided on the outer periphery of the connection sleeve. The connection sleeve of the present invention preferably has a tensile breaking strength of 5 to 10 kN. The wire saw of the present invention is a wire saw in which both end portions of the wire rope are inserted into the connecting sleeve in an opposed state from both the left and right sides, and the connecting sleeve is connected in an endless state by caulking of the connecting sleeve. It is a wire saw having.
At present, the wire rope diameter of the wire saw used for cutting and dismantling the construction structure is almost 5.0 mm. However, the rope diameter is a diameter of a circumscribed circle in an arbitrary cross section of the rope. The dimensions of the connection sleeve used for a wire saw having a wire rope diameter of 5.0 mm are often 20 mm in total length, 9.0 to 9.3 mm in outer diameter, and 5.1 to 5.4 mm in inner diameter.

The connection sleeve of the present invention has a dividing means at a substantially central portion of the connection sleeve. The substantially central portion of the connection sleeve is a position of 20% of the sleeve length before and after the connection sleeve in the longitudinal direction from the center of the connection sleeve, and more preferably a position of 10% of the sleeve length. In the connection sleeve having a length of 20 mm, the substantially central portion is a position of 6 to 14 mm from one end of the connection sleeve, and more preferably a position of 8 to 12 mm.
In the present invention, there is no particular limitation on the connecting sleeve dividing means, for example, circumferential dividing grooves and holes provided on the outer periphery of the connecting sleeve, adhesion of two connecting sleeve pieces at a substantially central portion of the connecting sleeve, Examples include brazing and welding. Among these, circumferential grooves and holes provided on the outer periphery can be used particularly preferably because they can be easily machined into the connection sleeve. The connection sleeve of the present invention can have only a split groove provided on the outer periphery, can have only a hole, or can have both a split groove and a hole provided on the outer periphery. By providing both the split groove and the hole, it is possible to more reliably break the split groove. There is no restriction | limiting in particular in the shape of a hole, For example, a round hole, a polygonal hole, etc. can be mentioned, and it can be made into any of a through hole and a blind hole. The through hole refers to a hole reaching from the outer periphery to the inner periphery of the connection sleeve. One through hole can be provided, and two or more through holes can be provided. The two or more through holes are preferably present at symmetrical positions with respect to the central axis of the connection sleeve.
In the connection sleeve of the present invention, there is no particular limitation on the state of the inner peripheral surface, it can be a smooth surface, can be only penetrated with a drill, or can be provided with a groove or a screw. It can also be cut off.

FIG. 2 is a partial cross-sectional view of one embodiment of the connection sleeve of the present invention. The connection sleeve of this aspect has a cross section of 3.0 mm at the opening, 1.5 mm at the bottom, and a depth of 0.5 mm at the center outer periphery of a metal sleeve having a total length of 20 mm, an outer diameter of 9.2 mm, and an inner diameter of 5.2 mm. A circumferential dividing groove 5 which is a 7 mm trapezoid is provided. That is, the outer diameter of the split groove portion is 7.8 mm. The connection sleeve of this aspect has C chamfers 6 on the inner peripheral portions at both ends. By providing C chamfers at the inner peripheral portions at both ends, the end portions of the wire rope can be easily inserted into the connection sleeve.
FIG. 3 is a partial cross-sectional view of another embodiment of the connection sleeve of the present invention. In the connection sleeve of this embodiment, two through holes 7 having a diameter of 3.0 mm are provided in the split groove of the connection sleeve shown in FIG. By providing a through hole in the split groove, the wire saw can be broken more reliably in the split groove of the connection sleeve.

FIG. 4 is a partial cross-sectional view of another embodiment of the connection sleeve of the present invention. The connection sleeve of this embodiment is obtained by cutting an M6 female screw 8 on the inner periphery of the connection sleeve shown in FIG. By cutting the female thread on the inner peripheral portion, the pulling strength of the wire rope connected by caulking of the connection sleeve can be increased, and the connection sleeve can be more reliably broken.
FIG. 5 is a partial cross-sectional view of another embodiment of the connection sleeve of the present invention. In the connection sleeve of this aspect, two through holes 7 having a diameter of 3.0 mm are provided in the circumferential groove of the connection sleeve shown in FIG. The M6 female screw 8 is cut. By providing the through hole in the split groove, the connection sleeve can be more reliably broken by the split groove. By cutting the female thread on the inner periphery of the connection sleeve, the pulling strength of the wire rope connected by caulking the connection sleeve can be increased, and the connection sleeve can be more reliably broken.

  In the wire saw of the present invention, the tensile breaking strength of the dividing means of the connection sleeve is preferably 5 to 10 kN, and more preferably 6 to 8 kN. If the tensile breaking strength of the dividing means is less than 5 kN, the wire saw may be easily broken during work. If the tensile breaking strength of the dividing means exceeds 10 kN, the wire rope may come off from the connection sleeve before the dividing means breaks during use of the wire saw. By setting the tensile breaking strength of the dividing means of the connecting sleeve to preferably 5 to 10 kN, more preferably 6 to 8 kN, the connecting sleeve does not frequently break during the use of the wire saw, so that the wire rope can be used during the use of the wire saw. The cutting operation can be performed safely without coming out of the connecting sleeve.

A manual hydraulic press and a die are used to connect the wire rope by caulking the connection sleeve. For caulking of the connection sleeve, a die having a circular or regular hexagonal cross section is often used. FIG. 6 is a cross-sectional view of an example of a die having a regular hexagonal cross section used for caulking the connection sleeve. The wire rope is connected by caulking the connection sleeve 3 into which the end portion 1 of the wire rope is inserted using a die 9 having a regular hexagonal cross section. For connecting sleeves with a total length of 20 mm, outer diameter of 9.2 mm, inner diameter of 5.2 mm and wire rope diameter of 5.0 mm, dies with a regular hexagonal spacing of 7.4 to 7.8 mm are generally used. Used.
For wire rope connection by caulking of the connection sleeve, insert the ends of the two wire ropes so that both ends are in contact with each other at the center of the connection sleeve, set the connection sleeve on the die of the hydraulic press, pressurize and connect Crimp the wire rope by caulking the sleeve. After finishing the caulking at one place, the connecting sleeve is shifted, and the remaining parts that are not crimped are crimped in the same manner. In the case of a die having a regular hexagonal cross section, the positions of the crimped connection sleeves are aligned so that the hexagonal surfaces of the connecting sleeve are the same on the left and right sides, and crimping is performed so that the crimping on the left and right sides overlap.

  The tensile breaking strength of the connecting sleeve dividing means can be measured by conducting a tensile test on the connecting sleeve. In the case of a connecting sleeve having a total length of 20 mm, an outer diameter of 9.2 mm, and an inner diameter of 5.2 mm, in which the dividing means is only the circumferential groove, the outer diameter of the circumferential groove portion is usually 6.5-8. 0.5 mm is preferable, and 7.0 to 8.0 mm is more preferable. In the case of a connecting sleeve having a total length of 20 mm, an outer diameter of 9.2 mm, and an inner diameter of 5.2 mm, in which the dividing means is two through holes provided at symmetrical positions with respect to the central axis, the diameter of the through hole is usually 2.0. It is preferably ˜5.0 mm, and more preferably 3.0 to 4.0 mm. When the dividing means is a circumferential dividing groove and a connecting sleeve having a total length of 20 mm, an outer diameter of 9.2 mm, and an inner diameter of 5.2 mm, which are two through holes provided symmetrically with respect to the central axis, the circumferential direction The outer diameter of the split groove portion is usually preferably 7.0 to 8.5 mm, more preferably 7.2 to 8.0 mm, and the diameter of the through hole is usually 2.0 to 2.0 mm. 4.0 mm is preferable, and 2.5 to 3.5 mm is more preferable. By providing the circumferential dividing groove and the two holes symmetrically with respect to the central axis as the dividing means, the connecting sleeve can be surely broken in the dividing means.

There are no particular restrictions on the material of the connection sleeve of the present invention, for example, general structural rolled steel such as SS300 and SS400, carbon steel such as S45C, S30C and STKM11A, tool steel such as SK, SKS and SKD, or heat treatment of these. And titanium alloys such as pure titanium and TAB6400H, aluminum alloys such as duralumin A2017B, and the like.
Since the wire saw of the present invention has the dividing means at the substantially central portion of the connection sleeve, even if an abnormal force is generated during the cutting operation and the wire saw breaks, the breakage occurs at the connection sleeve dividing means. Since it is divided into left and right and each remains at the end of the wire, it is possible to prevent the connection sleeve from jumping out, the beads from being scattered, and falling off.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.
Example 1
A carbon steel pipe STKM11A for mechanical structure defined in JIS G 3445 was quenched and tempered to produce a connection sleeve having a hardness HRB40. The dimensions of the connection sleeve were a total length of 20 mm, an outer diameter of 9.2 mm, and an inner diameter of 5.2 mm, and C chamfers were provided at the inner peripheral portions at both ends. This connection sleeve is referred to as a connection sleeve A.
The connection sleeve A was processed to produce a connection sleeve B having dividing means having the shape shown in FIG. The circumferential groove provided on the outer periphery of the connecting sleeve has a trapezoidal shape with a cross section of 3.0 mm at the opening, 1.5 mm at the bottom, and 0.9 mm in depth. The outer diameter of the groove is 7.4 mm. It is. Two operation wire ropes having a configuration 1 × 7, stainless steel SA, and a rope diameter of 5.0 mm defined in JIS G 3540 were cut into a length of 50 mm so that the cut surface was smooth. Insert this wire rope 10mm from the left and right sides of the connection sleeve B, caulk the connection sleeve using a manual hydraulic press and a die with a regular hexagonal cross section and a distance of 7.8mm between the opposing surfaces. Was made. Using a universal testing machine [Shimadzu Corporation, Autograph AG-20kNC], a tensile test was performed at a tensile speed of 5 mm / min. All the tensile test pieces were broken by the dividing means at the center, and the average value of the tensile breaking strength was 10.6 kN.
In the split groove portion of the connection sleeve B, two through holes having a diameter of 3.0 mm are formed at positions symmetrical with respect to the central axis to produce a connection sleeve C having the shape shown in FIG. A test was conducted. All the tensile test pieces were broken by the dividing means at the center, and the average value of the tensile breaking strength was 7.3 kN.
An M6 female thread was cut on the entire inner peripheral surface of the connection sleeve B to produce a connection sleeve D having the shape shown in FIG. 4, and five tensile tests were performed in the same manner. All the tensile test pieces were broken by the dividing means at the center, and the average value of the tensile breaking strength was 7.1 kN.
Cut an M6 female thread on the entire inner surface of the connection sleeve B, and further open two through-holes with a diameter of 3.0 mm in the split groove portion at positions symmetrical to the central axis. E was prepared and five tensile tests were performed in the same manner. All the tensile test pieces were broken by the dividing means at the center, and the average value of the tensile breaking strength was 5.1 kN.
The connection sleeve A was processed to produce a connection sleeve F having dividing means having the shape shown in FIG. The circumferential groove provided on the outer periphery of the connecting sleeve has a trapezoidal cross section with an opening of 3.0 mm, a bottom of 1.5 mm and a depth of 0.7 mm. The outer diameter of the groove is 7.8 mm. It is. Using this connection sleeve F, five tensile test pieces were produced in the same manner, and five tensile tests were performed. All the tensile test pieces were broken by the dividing means at the center, and the average value of the tensile breaking strength was 12.9 kN.
In the split groove portion of the connection sleeve F, two through holes having a diameter of 3.0 mm are formed at positions symmetrical to the central axis to produce the connection sleeve G having the shape shown in FIG. A test was conducted. All the tensile test pieces were broken by the dividing means at the center, and the average value of the tensile breaking strength was 9.0 kN.
An M6 female thread was cut on the entire inner surface of the connection sleeve F to produce a connection sleeve H having the shape shown in FIG. 4, and five tensile tests were performed in the same manner. All the tensile test pieces were broken by the dividing means at the center, and the average value of the tensile breaking strength was 9.9 kN.
Cut an M6 female thread on the entire inner surface of the connecting sleeve F, and further open two through-holes with a diameter of 3.0 mm in the split groove portion at a symmetrical position with respect to the central axis. I was produced and the tensile test was performed 5 times in the same manner. All the tensile test pieces were broken by the dividing means at the center, and the average value of the tensile breaking strength was 6.6 kN.
The connection sleeve A was processed to produce a connection sleeve J having dividing means having the shape shown in FIG. The circumferential groove provided on the outer periphery of the connecting sleeve has a trapezoidal shape with a cross section of 3.0 mm at the opening, 1.5 mm at the bottom, and a depth of 0.5 mm. The outer diameter of the dividing groove is 8.2 mm. It is. Using this connection sleeve J, five tensile test pieces were produced in the same manner, and five tensile tests were performed. All the tensile test pieces were broken by the dividing means at the center, and the average value of the tensile breaking strength was 16.8 kN.
In the split groove portion of the connection sleeve J, two through holes having a diameter of 3.0 mm are formed at positions symmetrical to the central axis to produce the connection sleeve K having the shape shown in FIG. A test was conducted. All the tensile test pieces were broken by the dividing means at the center, and the average value of the tensile breaking strength was 10.8 kN.
An M6 female thread was cut on the entire inner surface of the connection sleeve J to produce a connection sleeve L having the shape shown in FIG. 4, and five tensile tests were performed in the same manner. All the tensile test pieces were broken by the dividing means at the center, and the average value of the tensile breaking strength was 10.4 kN.
Cut an M6 female thread on the entire inner circumference of the connection sleeve J, and further open two through-holes with a diameter of 3.0 mm in the split groove portion at positions symmetrical to the central axis. M was prepared and five tensile tests were performed in the same manner. All the tensile test pieces were broken by the dividing means at the center, and the average value of the tensile breaking strength was 8.6 kN.
The results of Example 1 are shown in Table 1.

  By using the connection sleeve and the wire saw of the present invention, when the wire saw breaks without the wire rope coming out of the connection sleeve, it breaks at the dividing means at the substantially central portion of the connection sleeve, and is connected both before and after the breakage point. Since the sleeve remains, it is possible to safely perform the cutting work by the wire saw method. Further, when the broken portion is connected using a new connection sleeve, all the beads remain in a predetermined position of the wire rope, so that the wire saw can be easily connected in a short time and the operation can be resumed.

It is a fragmentary sectional view which shows an example of the connection part of a wire saw. It is a fragmentary sectional view of one mode of a connection sleeve of the present invention. It is a fragmentary sectional view of the other aspect of the connection sleeve of this invention. It is a fragmentary sectional view of the other aspect of the connection sleeve of this invention. It is a fragmentary sectional view of the other aspect of the connection sleeve of this invention. It is sectional drawing of an example of the die | dye used for caulking of a connection sleeve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 End part of wire rope 2 End part of wire rope 3 Connection sleeve 4 Bead 5 Split groove 6 C chamfer 7 Through hole 8 Female thread 9 Die

Claims (4)

  A connection sleeve of a diamond wire saw, comprising a dividing means at a substantially central portion of the connection sleeve.   The connection sleeve according to claim 1, wherein the dividing means is a circumferential groove and / or hole provided on the outer periphery of the connection sleeve.   The connecting sleeve according to claim 1, wherein the dividing means has a tensile breaking strength of 5 to 10 kN.   In a wire saw in which both ends of the wire rope are inserted into the connection sleeve from both the left and right sides so as to face each other and are connected in an endless state by caulking of the connection sleeve, the connection sleeve has a dividing means at a substantially central portion. Wire saw.

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