JPH0456522B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Application of the Invention> The present invention relates to a wire drawing tension control mechanism (hereinafter simply referred to as "wire drawing tension control mechanism") of a wire drawing apparatus.

In this specification, the term "electric wire" has a broad concept that includes wires used in overhead line work, messenger wires, traction wires, and the like. Furthermore, the term "hydraulic actuating body" refers to a hydraulic device that has both the functions of a hydraulic motor and a hydraulic pump, and the term "hydraulic pump" refers to a hydraulic device that only has the function of a hydraulic pump. It shall be.

<Prior Art> As a conventional wire drawing tension control mechanism, for example, the one shown in Japanese Utility Model Publication No. 10168/1983 is known.

<Problems to be Solved by the Invention> However, the conventional wire tension control mechanism described above does not control the wire tension by simply controlling the discharge pressure of the hydraulic actuator connected to the rotating body for feeding out the wire. Improvements have been made in that it is difficult to deal with cases where the specific resistance of the wire drawing device is greater than the necessary wire drawing tension, and that it is difficult to respond quickly in the case of temporary unwinding. There was room for.

<Means for Solving the Problems> As a means for solving the above problems, in this invention, the wire tension control mechanism includes a wire tension control mechanism that is connected to a rotating shaft of a speed increaser that is connected to a rotating body for feeding out electric wires. 1st
a hydraulic actuating body, a variable capacity, forward/reverse discharge type second hydraulic actuating body connected to the first hydraulic actuating body in a closed circuit, a first relief valve connected to the closed circuit, and a second hydraulic actuating body. a control section that controls the discharge amount and direction of discharge and the set pressure of the first relief valve; a wire tension setting means connected to the control section; and a wire tension detection means also connected to the control section. , a charge pump that is connected to the low pressure side of the closed circuit and always discharges a predetermined amount of oil;
and a second relief valve that is interposed between the low pressure side of the closed circuit and the charge pump and sets the pressure of oil supplied from the charge pump to the low pressure side of the closed circuit to a predetermined pressure.

Further, in the present invention, regarding such a wire tension control mechanism, oil at a predetermined pressure is supplied to the positive direction suction side of the first hydraulic actuating body via a third relief valve whose set pressure is controlled by the control section. It is connected to a hydraulic pump for supply.

<Function> In other words, when the first hydraulic actuating body is used as a "hydraulic pump" which forms a predetermined discharge pressure with the first relief valve, the same control as the conventional one can be performed, and the first hydraulic actuating body can be The second hydraulic actuating body is operated as a "hydraulic motor" by its discharge force.
It is also possible to generate a predetermined wire drawing tension by braking action using the load generated on the second hydraulic actuating body as a "hydraulic motor," and the necessary wire drawing tension can be adjusted to the specific resistance of the wire drawing device. If it is smaller, the second hydraulic actuator is operated as a "hydraulic pump" and its discharge force causes the first hydraulic actuator to perform the function of a "hydraulic motor" and perform a feeding action, thereby increasing the wire tension and It is also possible to boost the difference between the resistivity and the specific resistance, and if temporary rewinding is required, the second hydraulic actuating body is operated as a "hydraulic pump" with reverse discharge, and its discharge force increases the pressure of the first hydraulic actuator. It is also possible to perform rewinding by making the hydraulic actuator work as a "hydraulic motor" that rotates in reverse. These functions are automatically selected and activated by a control section that constantly obtains information regarding the wire drawing state from the wire drawing tension setting means and the wire drawing tension detecting means.

In addition, when a hydraulic pump is connected to the forward suction side of the first hydraulic actuating body, the boosting by this hydraulic pump can be performed in place of the boosting by the second hydraulic actuating body, and the second hydraulic actuating body In the case of body support, a closed circuit is involved, so that support, which tends to be somewhat unstable, can be performed in a more stable state.

<Example> Hereinafter, an example of the wire tension control mechanism according to the present invention will be described with reference to FIG.

In this wire tension control mechanism, a first hydraulic actuating body 4 is connected to a rotating shaft 3 of a speed increaser 2 connected to a rotating body 1 for wire feeding, and a closed circuit 5 is connected to this first hydraulic actuating body 4. A variable capacity, forward/reverse discharge type second hydraulic actuating body 6 is connected, and a first relief valve 9 is provided in the closed circuit 5 via check valves 7 and 8. Note that the speed increaser 2 exhibits a speed increasing function when viewed from the side of the rotary body 1 for feeding out electric wires, and exhibits a deceleration function when viewed from the first hydraulic actuating body 4 side.

Further, the discharge amount and discharge direction of the closed circuit 5, specifically the second hydraulic actuating body 6, are controlled by the servo mechanism 10.
A control unit 11 is provided for controlling the set pressure of the first relief valve 9. Further, a wire tension setting means 12 is connected to the control section 11, and a load cell 14 provided in contact with the rotating shaft 13 of the rotating body 1 for wire feeding is connected as a "wire tension detection means". There is. Then, the predetermined wire drawing tension set by the wire drawing tension setting means 12 and the actual wire drawing tension detected by the load cell 14 are compared in the control section 11, and the discharge of the second hydraulic actuating body 6 is performed based on the comparison result. Control of the amount and discharge direction or adjustment of the set pressure of the relief valve 9 is automatically performed. 16 is a charge pump, and this charge pump 16 is constantly rotated by an electric motor 28, and always discharges a predetermined amount of oil. Depending on the amount of oil discharged from the charge pump 16 that is insufficient due to oil leakage in the closed circuit 5, part or all of the oil is discharged from the check valve 15.
or the closed circuit 5 via the check valve 19.
The surplus that exceeds the required supply is supplied to the second
It returns to the oil tank 18 via the relief valve 17. That is, this charge pump 16 has the role of compensating for a pressure drop due to oil leakage on the low pressure side of the closed circuit 5 by cooperating with the second relief valve 17.

Furthermore, a hydraulic pump 20 is connected to the "positive" suction side of the first hydraulic actuating body 4, so that oil at a predetermined pressure can be supplied to the first hydraulic actuating body 4 as needed, and the oil supplied thereby can be In order to discharge excess oil from the circuit 5 to the outside of the closed circuit 5, it is connected to and separated from the closed circuit 5 by a solenoid valve 21 controlled by the control unit 11, although the route is not shown in the figure. A fourth relief valve 22 that can be freely moved is provided. The pressure of the oil supplied by this hydraulic pump 20 is set by the third relief valve 23, and the set pressure of the third relief valve 23 is automatically controlled by the control unit 11 in the same manner as described above. It is set to . Although the path is not shown in the figure, the fourth relief valve 22 is also connected to the control unit 11.
can be controlled in conjunction with the third relief valve 23.

In the figure, 24 is a fifth relief valve for preventing excessive pressure in the closed circuit 5, 25 is an oil cooler, 26 and 27 are check valves, and 28 is an electric motor. Further, 30 is a tension display section, 31 is a recorder, 32 is a speedometer, and 33 is a length meter.

The operating state of this wire tension control mechanism will be explained below.

By using the first hydraulic actuating body 4 as a hydraulic pump in which a predetermined discharge pressure is generated by the first relief valve 9, control similar to the conventional one can be performed.
In this case, the discharge amount of the second hydraulic actuating body 6 is 0.
is set to .

Furthermore, by causing the first hydraulic actuating body 4 to work as a "hydraulic pump" and using its discharge force to operate the second hydraulic actuating body 6 as a "hydraulic motor",
It is also possible to obtain a braking action by utilizing the load generated on the electric motor 28 that is forcibly rotated by the second hydraulic actuating body 6 serving as a "hydraulic motor" to generate a predetermined wire tension. This is because the braking force is ultimately controlled by controlling the discharge amount of the second hydraulic actuating body 6, so the first relief valve 9 is
In contrast to pressure type control, which obtains braking force in

In addition, when the necessary wire drawing tension is smaller than the specific resistance of the wire drawing device, the second hydraulic actuating body 6 is operated as a "hydraulic pump" and its discharge force is used to increase the first
It is also possible to make the hydraulic actuating body 4 exhibit a "hydraulic motor" function to perform a feeding action and "boost" the difference between the wire tension and the specific resistance.

Additionally, if temporary rewinding is required,
It is also possible to operate the second hydraulic actuator 6 as a "hydraulic pump" with reverse discharge, and use its discharge force to cause the first hydraulic actuator 4 to act as a "hydraulic motor" with reverse rotation to perform rewinding.

Furthermore, in place of the "boosting" by the "hydraulic pump" function of the second hydraulic actuating body 6 in the closed circuit 5 described above, if a circuit centered around the hydraulic pump 20 is operated, in the case of the closed circuit 5, the second This allows "boosting", which tends to be somewhat unstable due to the somewhat poor response of the hydraulic actuating body 6, to be performed in a more stable state.

These functions are performed by the wire tension setting means 1.
2 and the wire drawing tension detection means, specifically, the control unit 11 which constantly obtains information regarding the wire drawing state from the load cell 14, automatically selects and exerts the wire drawing tension.

In each of these embodiments, a so-called "shu-chen type" is used as the "rotating body for feeding out electric wires," but it is not limited to this.In short, any type of rotating body that feeds out the electric wires while rotating Ba,
It may be of any format. Further, the "wire extension tension detection means" is not limited to the load cell 14 used in this embodiment, and for example, a torque meter may be provided between the speed increaser 2 and the first hydraulic actuating body 4. Alternatively, the tension detector may be provided at a location other than the wire stretching device, such as a steel tower or an appropriate location in an overhead wire section.
However, the use of the load cell 14 is more preferable than a torque meter in that it is not affected by various mechanical resistances of the wire drawing device itself and can more accurately detect the actual wire drawing tension.

<Effects of the Invention> As described above, the wire tension control mechanism according to the present invention provides a closed circuit to the first hydraulic actuating body connected to the rotating shaft of the speed increaser connected to the rotating body for wire feeding. Since the framework is a hydraulic circuit formed by connecting a second hydraulic actuating body with a variable capacity and forward/reverse discharge type, the first hydraulic actuating body can be used as a "hydraulic pump" to control the wire tension, and the Flow type control by operating one hydraulic actuating body as a "hydraulic pump" while operating a second hydraulic actuating body as a "hydraulic motor"; Various types of control are possible, such as boosting wire unwinding by making the first hydraulic actuating body perform the function of a "hydraulic motor," and temporarily rewinding the wire by making the second hydraulic actuating body act as a "hydraulic pump" with reverse discharge. It has the excellent effect of being able to quickly select and respond to the wire drawing situation depending on the wire drawing situation, and to perform more accurate and efficient wire drawing tension control.

Moreover, when a hydraulic pump is connected to the first hydraulic actuating body, there is an effect that more stable boosting can be performed by providing boosting with this hydraulic pump.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram schematically showing a wire tension control mechanism according to the present invention. 1... Rotating body for feeding out electric wire, 2... Speed increaser,
3... Rotating shaft, 4... First hydraulic actuating body, 5... Closed circuit, 6... Second hydraulic actuating body, 9... First relief valve, 11... Control unit, 12... Wire extension tension Setting means, 14...Load cell (wire extension tension detection means), 16...Charge pump, 17...Second
Relief valve, 18...oil tank.

Claims (1)

[Scope of Claims] 1. A first hydraulic actuating body connected to a rotating shaft of a speed increaser connected to a rotating body for feeding electric wires, and a variable capacity positive pressure actuator connected to the first hydraulic actuating body in a closed circuit. A second hydraulic actuating body of reverse discharge type, a first relief valve connected to a closed circuit, and a control unit that controls the discharge amount and discharge direction of the second hydraulic actuating body and controls the set pressure of the first relief valve. , a wire tension setting means connected to the control section, a wire tension detection means also connected to the control section, and a charge pump connected to the low pressure side of the closed circuit and constantly discharging a predetermined amount of oil. , and a second relief valve that is interposed between the low pressure side of the closed circuit and the charge pump and sets the pressure of oil supplied from the charge pump to the low pressure side of the closed circuit to a predetermined pressure. Line tension control mechanism. 2. A first hydraulic actuating body connected to a rotating shaft of a speed increaser connected to a rotating body for feeding out electric wires, and a second hydraulic actuating body of a variable capacity forward/reverse discharge type connected to the first hydraulic actuating body in a closed circuit. A hydraulic actuating body, a first relief valve connected to a closed circuit, a control section that controls the discharge amount and discharge direction of the second hydraulic actuating body and a set pressure of the first relief valve, and connected to the control section. the wire tension setting means, which is also connected to the control unit; the charge pump, which is connected to the low pressure side of the closed circuit and always discharges a predetermined amount of oil; and the low pressure side of the closed circuit. a second relief valve that is interposed between the side and the charge pump and sets the pressure of oil supplied from the charge pump to the low pressure side of the closed circuit to a predetermined pressure; , a wire drawing tension control mechanism for a wire drawing apparatus, which is connected to a hydraulic pump that supplies oil at a predetermined pressure via a third relief valve whose set pressure is controlled by a control section.