JPS60132102A - Hydraulic cable engine - Google Patents

Abstract

PURPOSE:To increase the speed at cable laying by a structure wherein a command dispatcher is provided in a control unit and a bypath, in which a control valve acting on and off by the command sent from the command dispatcher is interposed, is provided between a high pressure oil pipe line and a low pressure pipe line. CONSTITUTION:A command dispatcher 14 is provided in a control unit consisting of a command section 1, a detector 2, a control circuit 3 and a servo mechanism 4. In addition, a bypath, in which a binary control valve 15 acting on and off by the command sent from the command dispatcher 14 is interposed, is provided between a high pressure oil pipe line 12 and a low pressure oil pipe line 13. Thus, the rate of flow fed to a hydraulic motor 10 is made to be several times the maximum rate of flow delivered from a pump 6, resulting in enabling to increase the cable laying speed. Furthermore, because the pump 6 is operated at the efficiency of about 100% at all times, resulting in enabling to efficiently obtain regenerative electric power.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to an improvement in a hydraulic cable engine, and in particular, in order to enable a lowering speed that exceeds the pump capacity when laying a cable, a hydraulic oil circuit is controlled. This invention relates to a hydraulic cable engine with a valved bypass.

[Technical Background of the Invention] A variable capacity cedar hydraulic pump driven by an electric motor and a constant capacity cedar hydraulic pump are used as a drive device to drive the drum of a cable engine installed on a laying ship that lays and retrieves submarine electric cables, etc. Many are combined with a pot-shaped hydraulic motor.

The main structure and system of such a conventional cable engine is shown in FIG. To explain this, the command unit 1 gives a cable speed command rate (So) or a cable tension command rate (To). On the other hand, the actual cable speed rate (Sa) or cable tension rate (Ta) is detected by the detector 2, and the actual values (Sa) and (Ta) are sent to the control circuit 3 along with the command rates (So) and (To). input, deviation (
So -3a) or (To -Ta) is determined, a control calculation is performed on it, and the pump swash plate angle command rate (φO) is output from the control circuit 3 and input to the pump swash plate angle servo mechanism 4, thereby making it variable. The swash plate angle of the capacity expansion hydraulic pump 6 is positioned. This is a so-called feedback control system. The variable displacement expansion hydraulic pump 6 driven by the electric motor 5 sends the pressure oil regulated as described above to the constant displacement expansion hydraulic motor 10 through the high pressure oil piping 12 and the low pressure oil piping 13, which are circulating hydraulic oil piping. drive Hydraulic motor 10 drives drum 8 via deceleration mechanism 9 to wind up or unwind cable 7 .

In the case of winding and unwinding, the drum 8, the speed reduction mechanism 9
The rotational direction of the hydraulic motor 10 is also reversed, and the flow direction of the hydraulic oil is also reversed. However, in the variable capacity expansion hydraulic pump 6, the swash plate angular ratio only changes by an amount from (→-1) to (-1), but the rotation direction remains unchanged.

Control circuit 11 provided between hydraulic oil pipes 12 and 13
This is to prevent cavitation and excessive pressure from occurring.

When the cable engine described above is viewed as one control system, the controlled variable is the speed or tension of the cable 7, and the manipulated variable is the swash plate angle of the pump 6.

In addition, when laying a cable to the seabed, this cable engine is driven by pulling the drum 8 in the unwinding direction by the cable 7 by the weight of the cable 7 connected from the drum 8 to the seabed and the thrust of the cable laying ship. Therefore, the motor 10 is driven via the reducer 9 to perform a pumping action, and this drives the pump 6 via the hydraulic piping 12.13, so the pump 6 performs the action of a hydraulic motor, and the directly connected electric motor 5 The electric motor 5 functions as a generator to regenerate power to the inboard power system.

[Problems in the Background Art] In the hydraulic cable engine described above, not only when the cable is hoisted, but also when the cable is laid down, when the cable is laid down, the motor 1O becomes the pump, and the pump 6 becomes a motor, which drives the electric motor 5 to act as a generator. However, since the electric motor (generator) 5 cannot be over-rotated, the flow rate of hydraulic oil is limited at the maximum swash plate angle of the pump 6. Therefore, the rotational speed of the drum is also limited to this,
This also limits the cable installation speed. In order to increase the cable laying speed, it is necessary to increase the capacity of the pump 6, but this is disadvantageous in terms of weight, cost, etc.

[Purpose of the Invention] Therefore, the present invention aims to dramatically increase the speed at which the cable is laid by providing a bypass with a flow rate control device in the hydraulic piping in a hydraulic cable engine, and to achieve this. The purpose is to be able to effectively regenerate electric power.

[Structure of the Invention] In order to achieve this object, the present invention provides a cable drum that is driven by a combination system of an electric motor-driven variable displacement cedar hydraulic pump and a constant displacement hydraulic expansion motor, which are controlled by commands from a control unit. In the engine, a command distributor is provided in the control unit, and when the flow rate of the hydraulic motor is set to a flow rate exceeding the maximum flow rate of the hydraulic pump, the engine is opened and closed according to a command from the command distributor to distribute the excess flow rate. The present invention is characterized in that a bypass with an operative control valve interposed therebetween is provided between the high pressure oil piping and the low pressure oil piping.

[Embodiments of the invention] , Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

FIG. 2 shows the main structure and system of the hydraulic cable engine according to the present invention. In the figure, a command unit 1, a detector 2
, servo mechanism 4, electric motor 5, variable displacement expansion hydraulic pump 6,
The cable 7, drum 8, speed reducer 9, constant displacement hydraulic motor 10, auxiliary circuit 11 and hydraulic piping 12,13 are similar to their respective counterparts in FIG. 1 and have the same functions as described above.

The difference between Fig. 2 and Fig. 1 is that the command unit 1, the detector 2,
A command distributor (distributor) 14 is provided in the control section consisting of a control circuit 3 and a servo mechanism 4, and a high-pressure pipe 12
A bypass pipe 16 having a binary control valve 15 is provided between the low pressure pipe 13 and the low pressure pipe 13.

The structure and operation of this embodiment will be explained below. Control circuit 3
is the cable speed command rate (So) or cable tension command rate (To) given from the command unit 1, as in the past.
and the actual cable speed rate (Sa) or actual cable tension rate (Ta) fed back from the detector 2, calculate (So-3a) or (To-Ta), perform control calculations on it, and obtain the flow rate command. Output the rate (Qo).

This flow rate command rate (Qo) is input to the distributor 14, and is distributed from the distributor 14 to a pump swash plate angle command rate (Qp) and an opening/closing signal (Qv, . . . ) for opening and closing the binary control valve 15.

When the flow rate command rate (Qo) is less than or equal to the maximum flow rate of the pump 6, all of (Qo) becomes (Qp) and (Qv) does not exist. Therefore, the binary control valve 15 is closed, the bypass line is closed, and the cable engine operates as before.

In this embodiment, the maximum flow rate of the pump 6 is 5°On! /
+n1ri.

The binary control valve 15 has a capacity of 1001/min, 20
0j! /min, 400Il/min, 800β/
A min flow control valve and an on-off valve directly connected to each are provided in parallel, and a 4-bit open/close signal from the distributor 14 allows digital control of each 100β/win as shown below. Set the flow rate.

When the flow rate Qo exceeds 50012/min, a signal (Qv) is sent from the distributor 14- to the binary control valve 1.
5 and the valve opens. The opening and closing of the valve is 500 (1/n
+in ~ 60011/min when 10072/
The min valve is open and the other valves are closed. 600#/m
200 when in ~700 ll/min! !
/min valve is open and the other valves are closed. 700β/m
100 j when in~800 R/min! /m
in and 2007! /min valve is open and the other valves are closed. 80012/min ~900 (1/min
When , the 400 ff/min valve is open and the other valves are closed. Similarly, the flow rate (Qv) is 100'R
Binary control valve 1 increases the flow rate up to 1', 500β/min by opening all valves
5 can be bypassed. therefore,
Combined with pump 6 flow rate it 50012/min 2
,0OOA/min can be tolerated.

In other words, in the conventional device without binary control #15, the pump 6 was limited to 500 R/min, so compared to this, it is possible to obtain a flow rate four times that of the pump 6, and the rotational speed of the drum 8, i.e. , the cable installation speed can be quadrupled.

The above explanation of the flow rate is shown in FIGS. 3 and 4 as graphs of the flow rate.

As can be seen from the above explanation and the graph of the pump flow rate (Qp) in FIG.
/min or more, the flow rate is 40014 /min to 50
01! /mrn, that is, the swash plate angle ratio is in the range of -0.8 to -1, which is within the limited capacity, and the pump 6 is operated as a motor, and the electric t
When a5 is driven as a generator to regenerate electric power, it is used most effectively.

As another example, the control valve 15 may be a normal analog control valve instead of a binary control valve, and the opening degree of the control valve may be controlled by a signal from the distributor 14, thereby bypassing the command flow rate (Qv).

[Effects of the Invention] As described in detail above, according to the present invention, the following effects can be obtained.

(b) The cable laying speed can be increased (four times in this example), resulting in a dramatic improvement in the efficiency of cable laying work. (80% to 100%), regenerative power can be effectively obtained.

(c) When it is not necessary to increase the cable laying speed much, by applying the present invention, the pump 6 can be downsized, and the amount of M and cost can be reduced.

(2) If a binary control valve is used as the control valve 15, the binary control valve is a low-cost on-off control, so
The cost of the control system can be lowered to 1.

(E) Since the binary control valve operates on-off and does not require intermediate holding, a bypass control circuit that is resistant to dust and highly reliable can be constructed, thereby increasing the reliability of the cable engine system.

(f) When using an analog control valve as the control valve 15,
If the flow rate control is accurate, the hydraulic pump 6 will be 100% immune to lightning.
The electric power regeneration by the electric motor (generator) 5 is most effective.

[Brief explanation of the drawing]

Fig. 1 is a main system diagram of a conventional cable engine, Fig. 2 is a main system diagram of a cable engine according to the present invention, and Fig. 3 is a main system diagram of a cable engine according to the present invention.
The figure and FIG. 4 are graphs of the flow rate of hydraulic oil. In the figure, 1 is a command unit, 2 is a detector, 3 is a control circuit,
4 is a servo mechanism, 5 is an electric motor, 6 is a variable capacity expansion hydraulic pump, 7 is a cable, 8 is a drum, 9 is a speed reducer, 10 is a constant capacity cedar hydraulic motor, 2 is a high pressure oil pipe, 13 is a low pressure oil pipe,
14 is a distributor, 15 is a binary control valve, 1
6 is no inogus. Applicant Mitsubishi Heavy Industries, Ltd. Representative Patent Attorney Akira Sakama Patent Attorney Kitanishi Patent Attorney Shinpo Ishikawa Patent Attorney Yoshimi Saigo Patent Attorney Yukio Harada Figure 1 Figure 2 Figure 3 Wrinkles vs. Qo Embryo ;n Fig. 4 Yumanfeng Q.

Claims (1)

[Scope of Claims] 1. In a cable engine that drives a cable drum by a combination system of an electric motor-driven variable displacement cedar hydraulic pump and a constant volume pot-shaped hydraulic motor, which is controlled by a command from a control unit, A distributor is provided, and when the flow rate of the hydraulic motor exceeds the maximum flow rate of the hydraulic pump, a control valve is interposed that opens and closes according to a command from the command distributor to allow the excess flow to flow. A hydraulic cable engine characterized in that a bypass is provided between high-pressure oil piping and low-pressure oil piping. 2. The hydraulic cable engine according to claim 1, wherein the control valve is a binary control valve. 3. The hydraulic cable engine according to claim 1, wherein the control valve is an analog control valve.