JPH0937424A - Cable extending device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance functions and at the same time to realize compacting by compensating each other the respective merits and demerits of the hydraulic system and a motor operating system used for the braking and driving mechanisms of the cable extending device. SOLUTION: A rotating body 1 is wound with a wire-shaped body and performs supply or take-up operation, which is connected and combined with a variable speed electric motor 6 and hydraulic pump 8 thereby forming brake and drive mechanisms. When supplyings under ordinary extension condition, the hydraulic pump 8 is used as a brake source, and adjusted supply and take-up requiring fine adjustment for extension are performed by using the variable speed electric motor 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire drawing device used for an overhead wire of a linear body such as a power transmission line.

[0002]

2. Description of the Related Art A hydraulic system or an electric system is used as a braking source or a driving source of a wire drawing apparatus, but these hydraulic systems and electric systems have advantages and disadvantages. In other words, the hydraulic system has the advantage that it does not require a power source, and has the advantage that no additional phenomenon is involved in braking, while it is especially useful in the case of a type that allows both braking and driving operations. Since the hydraulic piping becomes complicated and complicated, there is a disadvantage that the structure becomes complicated and the size becomes large, and the cost of designing and assembling thereof increases, and the driving operation is performed for winding the linear body. In this case, there is a disadvantage that the noise is particularly loud. On the other hand, the electric system has an advantage that the structure is simple, and has an advantage that it does not generate too much noise in both braking and driving, but has a disadvantage that it requires a power source such as a generator. Further, since the braking is performed by the regenerative braking, there is a disadvantage that a load is imposed on the processing of energy accompanying the regenerative braking.

In the conventional wire drawing apparatus, however, both braking and driving are formed by a hydraulic system if the type uses a hydraulic system (for example, Japanese Patent Laid-Open No. 3-155314 and Japanese Patent Publication No.
No. 56522), and in the case of a type using an electric system, both braking and driving are formed by an electric system (for example, Japanese Patent Publication No. 63-28484 and Japanese Patent Laid-Open No. 1-24380).
No. 5). For this reason, the conventional wire drawing apparatus is insufficient in that the disadvantages of either the hydraulic system or the electric system appear as they are, and at the same time, it is unsatisfactory in that the respective advantages of the hydraulic system and the electric system are effectively utilized. Was enough.

[0004]

SUMMARY OF THE INVENTION The present invention has been made against such a background, and in the wire drawing device, the advantages and disadvantages of the hydraulic system and the electric system used in the braking / driving mechanism are complemented. The aim is to enhance functionality and at the same time make it compact.

[0005]

A wire drawing apparatus according to the present invention comprises a rotating body to which a braking / driving mechanism is connected, and a linear body is wound around the rotating body to switch feeding and winding of the linear body. You can do it. The braking / driving mechanism is formed by combining an electric variable speed motor and a hydraulic pump, each of which is connected to a rotating body, and when the wire is extended normally, the hydraulic pump is used as a braking source, Adjustable payout and winding requiring fine adjustment are performed using an electric variable speed motor.

As described above, according to the present invention, the braking / driving mechanism is formed by the combination of the electric variable speed motor which is the electric system and the hydraulic pump which is the hydraulic system, and the hydraulic system is normally drawn in a wire drawing state by utilizing its characteristics. On the other hand, while the electric system is used for braking when unwinding, even if it requires braking without involving braking, and even if braking is required, for example, when suspending an electric wire on a suspension tower in the middle of a wire extension, It is used for the adjustable feeding which requires delicate adjustment and requires a small degree of braking, such as the feeding when the winding and the feeding are alternately performed little by little to align with the suspended position.

[0007] As a result, in terms of function, in addition to the normal pay-out for wire drawing, adjustable pay-out and winding can be performed, and even without a power supply, a normal wire drawing is sufficient. Multifunctionality is obtained. In terms of structure,
Compared with the case where both braking and driving are hydraulic systems, the hydraulic piping is less than half, and it is possible to make it compact and significantly reduce the design and assembly costs, and even if the electric system is used for regenerative braking, The burden can be reduced. Furthermore, since the hydraulic system is used only for the braking function, noise can be significantly reduced.

With respect to the wire drawing device as described above, it is possible to prevent the electric variable speed motor from substantially burdening the braking function. By doing so, the burden of regenerative braking can be eliminated. it can. for that purpose,
When the electric variable speed motor is used for the adjustable feeding, a braking force larger than the wire drawing tension at the time of the adjusted feeding is generated in the hydraulic pump, and the excessive braking force in the hydraulic pump is based on the speed control of the electric variable speed motor. Use the feeding force to offset it. That is, the regenerative operation state can be eliminated by using the electric variable speed motor in the power running operation in which the excessive braking force by the hydraulic pump is used as the load, not to mention the case of the winding, as well as the case of the feeding. .

Further, in the wire drawing device as described above, it is more preferable to connect the hydraulic pump to the rotary shaft of the electric variable speed motor through a one-way clutch.
With such a connection structure, the braking force of the hydraulic pump can be utilized by simply stopping the power supply to the electric variable speed motor when the wire is extended in the normal wire drawing state, and the electric variable speed motor can be driven to wind. In this case, the hydraulic pump can function as a brake when the winding is interrupted or stopped, and no switching operation is required even when the power feeding operation of the electric variable speed motor is used to perform the regulated feeding. The load function for the power running operation can be applied to the hydraulic pump without doing so.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below. As shown in FIG. 1, the wire drawing apparatus according to the present embodiment has a shoe chain drum 1 as a rotating body.
Is provided. Also, the rotating shaft 2 of this shoe chain drum 1
A braking / driving mechanism section 4 is connected to the chain-sprocket type transmission means 3. This braking / driving mechanism section 4 is provided with a transmission means 3 on the rotating shaft 2 of the shoe chain drum 1.
A speed reducer 5 connected to the input shaft of the speed reducer 5, an electric variable speed motor 6 directly connected to the input shaft of the speed reducer 5, a hydraulic pump 8 connected to a drive shaft of the electric variable speed motor 6 via a one-way clutch 7, and It consists of a hydraulic circuit for the hydraulic pump 8.
The arrow X in the figure indicates the rotation direction in which the one-way clutch 7 works for connection, and the arrow Y indicates the rotation direction in which the one-way clutch 7 does not work for connection.

The hydraulic circuit is composed of a hydraulic pump 8 and a braking relief valve 9 for setting a discharge pressure, that is, a braking pressure, a braking circuit section Sa, a control circuit section Sb for controlling the braking relief valve 9, and a hydraulic circuit. Includes a cooling circuit section Sc generally used in.

The control circuit section Sb includes an automatic control valve 10 for automatically adjusting the set pressure and a manual control valve 11 for manually adjusting the set pressure, and a switching valve 12 for switching these. Equipped with. Therefore, the switching valve 12
If the control by the automatic control valve 10 is actuated on the braking relief valve 9 by actuating, the braking pressure of the braking relief valve 9 can be automatically set, and the manual control valve 11
If the control by is applied to the relief valve 9 for braking,
A braking pressure according to need can be manually set in the braking relief valve 9.

Basically, two kinds of braking pressures are set in the braking relief valve 9. One of them is a braking pressure for paying out in a normal wire drawing state. The other one is that the braking pressure for a load for causing the electric variable speed motor 6 to perform a power running operation at the time of the adjustable feeding, that is, the electric variable speed motor 6 when the electric variable speed motor 6 performs the adjusted feeding. It is a braking pressure that makes it possible to use the braking force of the hydraulic pump 8 as a load for the power running operation in order to always maintain the power running operation while avoiding the regenerative braking state. This braking pressure is set so as to generate a braking force that is, for example, about 10 to 20% greater than the wire drawing tension at the time of the controlled feeding.

The automatic adjustment of the set pressure for the automatic control valve 10 for the braking pressure in the normal wire drawing state is performed by the wire tension detecting means 13 for detecting the wire tension from the rotary shaft 2 of the shoe chain drum 1, for example. This is performed while correlating the information from the wire drawing tension information source with a preset reference tension value. On the other hand, regarding the braking pressure for the power running load, the information from the wire tension information source similar to the above is used, or the information obtained from the control circuit of the electric variable speed motor 6 is used. As the information from the control circuit of the electric variable speed motor 6, for example, information on whether the electric variable speed motor 6 is in a power running operation or a regenerative operation, or information about the number of revolutions of the electric variable speed motor 6 can be used. . Further, regarding the braking pressure for this power running operation load, the manual control valve 1
It is also possible to use 1. In this case, the manual control valve 11 is set so that the braking relief valve 9 is fixedly provided with a braking pressure considerably larger than the expected wire tension.

[0015]

As described above, according to the present invention, the advantages and disadvantages of the hydraulic system and the electric system can be complemented with each other, so that the function is multifunctional and the structure is compact and the cost is low. Can be down.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a wire drawing device according to an embodiment of the present invention.

[Explanation of symbols]

 1 Rotating Body 4 Braking / Drive Mechanism 6 Electric Variable Speed Motor 7 One-Way Clutch 8 Hydraulic Pump

Claims (3)

[Claims] 1. A wire drawing device comprising a rotating body to which a braking / driving mechanism is connected, wherein a linear body can be wound around the rotating body to perform feeding and rolling-in, respectively. A braking / driving mechanism is formed by combining an electric variable speed motor connected to the body and a hydraulic pump, and when the wire is extended normally, the hydraulic pump is used as a braking source.
Further, the wire drawing device is characterized in that the electric variable speed motor is used for the adjustable feeding and the winding which require a fine adjustment of the feeding state. 2. When the electric variable speed motor is used for the controlled feeding, a braking force larger than the wire drawing tension at the time of the controlled feeding is generated in the hydraulic pump, and the excessive braking force in the hydraulic pump is applied to the electric variable speed motor. The wire drawing device according to claim 1, wherein the wire drawing device is offset by the feeding force based on the speed control. 3. The wire drawing device according to claim 1, wherein a hydraulic pump is connected to the rotary shaft of the electric variable speed motor via a one-way clutch.