JPH055782Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a device for applying a lubricant to the inner surface of a conduit into which a power cable is drawn, in order to facilitate the introduction of the cable, and in particular, to Move the lubricant applicator, which has a slightly smaller diameter than the
The present invention relates to a device that allows a lubricant to be sprayed out from the lubricant applicator to perform a coating operation.

(Prior art) Conventionally, when power cables are drawn into conduit conduits, the cables are coated with grease or polyethylene glycol at the entrance of the conduit in order to facilitate cable movement. water·
A lubricant made of a mixture of talc or the like is applied by hand to reduce the coefficient of friction of the cable against the inner surface of the conduit, thereby making it easier to move the cable.

However, applying the lubricant by hand as described above requires a lot of manpower, and when cables are being pulled in at high speeds, problems arise such as not being able to apply the lubricant in time, resulting in insufficient lubrication. In addition, there are problems in that the lubricant is applied by the cable only at the entrance to the inner wall of the conduit, and is not applied to the entire pipe.

In response to this, an apparatus has been proposed that applies lubricant directly to the inner wall of the pipe instead of applying the lubricant via the cable. For example, this method is as shown in Japanese Utility Model Application Publication No. 50-36985, etc., in which two disks formed to have approximately the same inner diameter as the pipe line are arranged at a predetermined interval, and grease is applied between the disks. The lubricant is moved within the pipe by a wire, and grease is applied to the inner wall of the pipe during the movement.

(Problem to be solved by the invention) However, in the conventional device as described above, in the case of a lubricant with relatively low fluidity such as grease, the inner wall of the conduit is However, when a highly fluid lubricant is used, problems arise such as the inability to uniformly coat the inner wall of the pipe.

Further, in the case of a device having the above-mentioned configuration, when the lubricant applicator is moved in and out of the pipe, the grease may leak out into the surrounding area, and there are many difficulties in handling the device.

(Purpose of the invention) The present invention eliminates the drawbacks of the conventionally used devices as described above, and makes it possible to arbitrarily adjust the amount of lubricant applied and to control the ejection of lubricant by gas pressure. The purpose is to provide a device that enables this.

(Means and effects for solving the problems) The present invention relates to an in-pipe lubricant application device that applies lubricant to the inner surface of an electric wire conduit into which a power cable is drawn. In the present invention, the lubricant applicator has a cylindrical body configured to have a diameter smaller than the inner diameter of the conduit in which the cable is installed, and a gas chamber and a lubricant chamber are connected to each other through a piston movably provided inside the body. A gas inlet is provided on the gas chamber side, and a plurality of nozzles are provided on the lubricant chamber side toward the inner wall of the pipe. Further, the lubricant applicator is provided with a substantially hemispherical front member and a rear member at both ends of the cylindrical main body, and the front and rear members connect the front member to the main body via a threaded portion. However, by connecting the rear member through a welded portion, the lubricant applicator is configured as a sealable container. Furthermore, in the device of the present invention, a plurality of nozzles are arranged in a radial direction diagonally forward on the front member provided at one end of the lubricant applicator, and each of the plurality of nozzles is provided with a valve. the other end of the device main body, the device is configured to be able to arbitrarily adjust the amount of lubricant ejected from the nozzle, and is configured such that the lubricant ejected from the tip of the nozzle is applied to the inner wall surface of the conduit; A gas inlet for injecting gas is provided in the rear member provided through the welded part to constitute a mechanism for introducing compressed gas from the gas inlet. In the device of the present invention, a lubricant is stored in the lubricant chamber, and the lubricant is pressurized via a piston by the gas pressure contained in the gas chamber, and moves within the pipe while jetting the lubricant from a nozzle. The lubricant can be applied uniformly by sliding the outer circumference of the main body on the inner surface of the pipe.

Therefore, in the pipe lubricant applicator of the present invention as described above, in addition to being able to easily control the ejection of lubricant by using gas pressure, the nozzle By adjusting the opening degree, it is possible to arbitrarily set the amount of lubricant ejected, and it is possible to easily lubricate the inner wall of the pipe. Also,
In the device of this invention, the hemispherical rear member that constitutes the gas chamber is integrally fixed to the main body by welding, so even if gas pressure is applied, it can be adapted to the pressure. . Furthermore, since the hemispherical front member constituting the lubricant chamber is attached to the main body via a screw, the operation of storing the lubricant can be easily performed. When lubricant is supplied from the lubricant chamber through the nozzle, the amount of lubricant supplied can be arbitrarily controlled by adjusting the opening degree of the valve. By the action of sliding on the inner surface of the conduit, the lubricant ejected from the nozzle can be uniformly applied to the inner surface of the conduit.

(Example) The configuration of the in-pipe lubricant application device of the present invention will be described according to the illustrated example.

As shown in FIG. 1, the main body 11 of the lubricant applicator 10 of the present invention has a circular cross section, and its outer diameter is slightly smaller than the inner diameter of the conduit 1. Eye members 24, 28 are provided at the tips of the front member 20 and rear member 25 attached to the front and rear of the main body 11, and the eye members 24, 2
Wires 9 and 9a are connected via wires 8 and the wires are pulled to be moved within the conduit.

The lubricant applicator 10 of the present invention is provided with a movable piston 13 inside its main body, and one chamber partitioned by the piston 13 is a gas chamber 1.
5, and the other side is formed as a lubricant chamber 17.
The gas chamber 15 stores compressed gas such as nitrogen gas or compressed air, and the other lubricant chamber 17 stores a lubricant 18. In addition, as the lubricant applied to the inside of the pipe in the present invention, as shown in the conventional example, grease, polyethylene glycol, etc.
A lubricant made of a mixture of water, talc, etc. can be used, and a lubricant material mixed with any other material can also be used.

As shown in FIG. 2, the lubricant applicator 10 of the present invention includes a substantially hemispherical front member 20 and a rear member 25 at both ends of a cylindrical main body 11. On the other hand, by connecting the front member 20 via the threaded portion 21 and connecting the rear member 25 via the welded portion 26, the lubricant applicator 10 is formed as a sealable container.

The fixed portion of the front member 20 can accommodate the lubricant and then attach the front member 20 by screwing as described above, which facilitates the work of inserting the lubricant. However, the connection does not require particularly strict sealing. For example, even if a small amount of lubricant leaks, by moving the device within the pipe, the leaked lubricant will be applied to the inner surface of the pipe, so the lubricant sprayed from the nozzle will be coated. In addition, the lubricant leaking from the connecting portion of the front member can be applied, and the inner surface of the pipe can be lubricated.

The front member 20 provided at one end of the lubricant applicator 10 has a plurality of nozzles 22 arranged toward the front thereof, and each nozzle 22 is provided with a valve 23 to prevent air from the nozzle 22. The amount of lubricant ejected can be adjusted as desired. As for the nozzles, for example, four nozzles are arranged at equal angles in the radial direction at 90° intervals with respect to the axis on the front side of the lubricant applicator, and the lubricant spouted from the tips of the nozzles is applied to the pipe line. It is configured so that it is evenly distributed over the entire inner wall of the.

Further, the rear member 25 provided at the other end of the main body 11 via a welded portion 26 is provided with a gas injection port 27 for injecting gas, and the gas injection port 27 is used to compress the gas as described above. Gas is introduced.
The pressure in the gas chamber 15 pressurizes the lubricant chamber 17 via the piston 13, and the lubricant chamber 17 is maintained at the same pressure as the gas pressure. Therefore, by opening the valve 23 of the nozzle 22, the lubricant 18 housed in the lubricant chamber 17 is ejected by gas pressure, and the piston 13 moves through the stroke S shown by the chain line in FIG. within the range of
While being moved in the direction of the arrow, the lubricant can be spouted.

The lubricant applicator 10 of the present invention configured as described above is moved within the conduit 1, as shown in FIG. 3, and can be moved while applying the lubricant to the inner surface of the conduit 1.

In the embodiment shown in FIG. 3, the wires 9 and 9a connected to both sides of the lubricant application device 10 are pulled out to the ground through the manholes 5 and 5a provided at both ends of the conduit 1, and The wires 9, 9a are wound onto the winding drums 7, 8. Further, pulleys 6, 6a are arranged inside the manholes 5, 5a and at predetermined positions on the ground, and the wire is guided through the pulleys.
Then, the lubricant application device 10 is applied from the manhole 5a side.
When inserting the wire 9, open the valve 23 of the nozzle 22 to spray out the lubricant, and in that state insert the wire 9.
is wound up by the drive of the winding drum 7 and moved within the conduit 1.

As mentioned above, when moving a lubricant applicator in a pipe, the amount of lubricant applied can be changed depending on the winding speed of the wire. For example, if a particularly large amount of lubricant is required, In curved portions, etc., it is possible to set the moving speed of the lubricant applicator to be slow, and the amount of lubricant applied can be adjusted by controlling the rotational speed of the winding drum 7 and adjusting the opening degree of the valve. I can do it. Then, by moving the device forward while spouting lubricant from a nozzle provided on the front side of the device, the outer peripheral portion of the device main body slides on the inner surface of the conduit. Therefore, the lubricant is moved between the outer peripheral surface of the cylindrical device main body and the inner surface of the conduit, and the lubricant supplied from the nozzle is uniformly applied to the inner surface of the conduit. It can be demonstrated.

Further, the main body of the lubricant applicator of the present invention can be configured without any protruding parts around the main body 11 as shown in the figure, but for example, a flange made of an elastic material can be provided around the main body 11. When using a means such as a protruding flange and sliding the flange on the inner wall of the pipe, it becomes possible to perform operations such as uniformly leveling the lubricant ejected from the nozzle, and the lubricant is It becomes possible to improve coating efficiency.

(Effect of the invention) Since the in-pipe lubricant applicator of the present invention is configured as described above, the lubricant from the lubricant chamber can be removed by using the gas pressure stored in the gas chamber of the device body. In addition to making it easier to control the lubricant ejection, by adjusting the opening of the nozzle, the amount of lubricant ejected can be arbitrarily set, which improves the lubrication of the inner wall of the pipe. It is possible to make the work easier. Also,
In the device of this invention, the hemispherical rear member that constitutes the gas chamber is integrally fixed to the main body by welding, so even if gas pressure is applied, it can be adapted to the pressure. . Furthermore, since the hemispherical front member constituting the lubricant chamber is attached to the main body via a screw, the operation of storing the lubricant can be easily performed. When lubricant is supplied from the lubricant chamber through the nozzle, the amount of lubricant supplied can be arbitrarily controlled by adjusting the opening degree of the valve. Due to the sliding action of the nozzle on the inner surface of the pipe, the lubricant ejected from the nozzle can be uniformly applied to the inner surface of the pipe, and the configuration of the device can be simplified, making it easier to apply the lubricant. It is possible to improve efficiency.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the relationship between the lubricant applicator of the present invention and the pipe line, Fig. 2 is a sectional view of the lubricant applicator of the present invention, and Fig. 3 is an explanatory diagram showing the overall configuration of the lubricant applicator of the present invention. It is a diagram. Codes in the diagram: 1...Pipeline, 9...Wire, 1
0...Lubricant application device, 11...Main body, 13...Piston, 15...Gas chamber, 17...Lubricant chamber, 18
...Lubricant, 20...Front member, 21...Threaded part, 2
2...Nozzle, 23...Valve, 24...Eye member, 25...Rear member, 26...Welding part, 27...
Gas inlet, 28...Eye member.

Claims (1)

[Scope of Claim for Utility Model Registration] In a device for applying lubricant to the inner surface of an electric wire conduit into which a power cable is drawn, a cylindrical body in which a lubricant applicator is configured to have a smaller diameter than the inner diameter of the conduit is installed inside the body. It is divided into a gas chamber and a lubricant chamber via a movably provided piston, a gas inlet is provided on the gas chamber side, and a plurality of nozzles are provided on the lubricant chamber side toward the inner wall of the pipe, respectively. The lubricant applicator is provided with a substantially hemispherical front member and a rear member at both ends of a cylindrical main body, and the front and rear members connect the front member to the main body via a threaded portion, and the rear member is connected to the main body through a threaded portion. By connecting the members through welds, the lubricant applicator is constructed as a sealable container, and a front member provided at one end of the lubricant applicator has a nozzle directed diagonally forward. A plurality of nozzles are arranged in a radial direction, each of the plurality of nozzles is provided with a valve, and the amount of lubricant ejected from the nozzle can be arbitrarily adjusted, and the lubricant ejected from the tip of the nozzle is A rear member provided at the other end of the apparatus main body via a welded portion is provided with a gas inlet for injecting gas, and the gas inlet The lubricant is contained in the lubricant chamber, the lubricant is pressurized via a piston by the gas pressure contained in the gas chamber, and is moved while being ejected from a nozzle, and the lubricant is moved through the pipe. 1. An in-pipe lubricant application device, characterized in that it is configured to apply a lubricant to an inner surface.