JPH06207492A - Leading pipe control device for small diameter pipe propelling machine - Google Patents

Abstract

PURPOSE:To facilitate connecting operation by reducing the number of electric cables for signal which connect a leading pipe to a control panel provided in an advance shaft. CONSTITUTION:In a small diameter pipe propelling machine in which a small diameter pipe 2 at the end of which a leading pipe 1 is connected is propelled under the ground by a propelling device 4 set in an advance shaft 3, a cutter head 5 which is free to swing by multiple direction correcting cylinders 6 controlled by a leading pipe controller 12 is installed at the top of the leading pipe 1. Also a control panel 15 to give an instruction to the leading pipe controller 12 and display the control results fed from the leading pipe controller 12 is set on the advance shaft 3 side. Because the leading pipe controller 12 is connected to the control panel 15 by an electric cable 16 for signal through which signals are transmitted by a multiplex communication system, the number of electric cables 16 can be reduced remarkably.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead pipe control device for a small diameter pipe propulsion machine in which the number of signal electric cables connecting the lead pipe and the operation panel is greatly reduced.

[0002]

2. Description of the Related Art Conventionally, a small-diameter pipe propelling machine for burying a small-diameter pipe in the ground has a small-diameter pipe propelled into the ground by a propulsion device installed in a starting shaft. Is equipped with a directional control conduit. Further, the conventional tip conduit is provided with a cutter head whose direction can be freely adjusted, and the propulsion direction is corrected by swinging the cutter head by a plurality of direction adjusting cylinders. The direction of is corrected as follows.

[0003] If the propulsion direction of the front conduit deviates from the planned line, if the operation control of the operation panel installed in the starting shaft is operated to correct this, a command signal from the operation panel enters the front conduit through the electric cable. A solenoid valve connected to the direction correcting cylinder is controlled based on the command signal sent to the provided pre-conduit controller.

On the other hand, each direction control cylinder is provided with proximity switches for detecting the amount of expansion and contraction, and the amount of expansion and contraction detected by these proximity switches is fed back to the operation panel via an electric cable, and the propulsion direction of the leading conduit is determined. Feedback control is performed so as to match the command position from the operation controller. For this reason, the normal operation panel and the front conduit controller are connected by an electric cable of about 28 cores. Further, these electric cables are divided into unit lengths of small-diameter pipes, and each time the small-diameter pipes are added, the electric cables are connected by a connector.

[0005]

Conventionally, an electric wire is provided for each input / output signal for exchanging signals between an operation panel installed in a starting shaft and a pilot conduit controller provided in a pilot conduit. Therefore, when the number of electric cables increases and a small-diameter pipe is added, it takes a lot of time to connect the electric cables, which lowers work efficiency and
There was a problem that the electric cable was easily damaged during the propulsion work.

Further, since the number of connectors for connecting the electric cables is large, a device such as a front conduit controller is large and requires a lot of space for installation.
Since there are many points to check when there is a failure, there were problems such as requiring a long time before the cause was determined. The present invention has been made to solve the above-mentioned conventional problems, and provides a lead pipe control device for a small diameter pipe propulsion machine in which the number of electric cables connecting between the lead pipe and the operation panel is significantly reduced. The purpose is.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a small-diameter tube having a tip conduit attached to its tip,
In a small-diameter pipe propulsion device that is propelled into the ground by a propulsion device installed in the starting shaft, a cutter head that is swingable by a plurality of direction correction cylinders controlled by a front pipe controller at the tip of the front pipe. In addition, on the side of the starting shaft, an operation panel for giving a command to the leading conduit controller and displaying the control result sent from the leading conduit controller is installed, and the space between the leading conduit controller and the operating panel is multiplexed. It is connected by a signal electric cable that transmits signals by a communication method.

[0008]

With the above structure, the number of electric cables for signal transmission can be greatly reduced, so that the connecting operation of the electric cables when adding the small-diameter pipes is simplified, and the connecting work of the small-diameter pipes can be performed in a short time. You will be able to do it efficiently.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings. 1 is an overall configuration diagram of a small-diameter pipe propulsion device, FIG. 2 is a cross-sectional view of a leading conduit, FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2, and FIG. 4 is an enlarged view of a direction correcting cylinder. 5 is a block diagram of the control system, FIG. 6 is a circuit diagram showing a part of the electric cable, and FIG. 7 is a flowchart showing the operation.

In FIG. 1, reference numeral 1 denotes a leading conduit which is attached to the tip of a small-diameter pipe 2 to be buried and propelled into the ground by a propulsion device 4 installed in a starting shaft 3 as shown in FIG. The cutter head 5 is provided at the tip. The cutter head 5 is swingable by a plurality of direction correction cylinders 6 provided in the tip portion of the front conduit 1, and the direction of the front conduit 1 can be corrected by these direction correction cylinders 6. In addition, a cutter 5a for excavating the face in front of the front conduit 1 is provided in the cutter head 5. The cutter 5a is the central portion of the leading conduit 1 and the small-diameter pipe 2.
It is attached to the tip end of a screw shaft 7a of a screw conveyor 7 provided in the central part of the above, and is driven to rotate by a drive device 8 provided in the propulsion device 4 via the screw shaft 7a.

Electromagnetic valves 9 are connected to the direction correcting cylinders 6, respectively, and the hydraulic pressure sent from a hydraulic unit 10 installed on the side of the starting shaft 3 through hydraulic pipes 11 passes through these electromagnetic valves 9. Is supplied to each direction correction cylinder 6, and in the vicinity of each solenoid valve 9, a leading conduit controller 12 for controlling the solenoid valve 9 is provided, and in the vicinity of the direction correction cylinder 6, a direction controller cylinder 12 is provided as shown in FIG. Correction cylinder 6
A stroke detector 13 for detecting the stroke is installed.

The stroke detector 13 is a plurality of dogs 13 mounted on the piston rod 6a of the direction correcting cylinder 6.
a and a plurality of proximity switches 13b that are turned on and off by these dogs 13a, and the operation stroke of the direction correction cylinder 6 can be detected by turning on and off each proximity switch 13b. The signal detected by the device 13 is the front conduit controller 12
It is designed to be input to.

On the other hand, an electric cable 16 provided in the small-diameter pipe 2 connects between the leading conduit controller 12 and the operation panel 15 installed in the starting shaft 3. The electric cable 16 is divided for each unit length of the small-diameter pipe 2, and can be connected by the connectors 17 provided at both ends. As shown in FIG. 5, the operation panel 15 includes an operation panel controller 15a, a direction correcting joystick 15b, and a direction display plate 1 for displaying a propulsion direction.
5c, the joystick 15b can be operated to control the propulsion direction of the leading conduit 1.

Further, the front conduit controller 12 and the operation panel 15
In order to reduce the number, the electric cables 16 connecting between the electric wires 16 among the electric wires for transmitting signals as shown in FIG. 6 are electric wires 16 ₆ and 16 ₇ on the transmission side and electric wires 16 on the reception side.
By adopting a multiplex communication system that multiplex-transmits signals to ₈ and 16 ₉ , the number of cables has been reduced to 4 compared to 28 of conventional signal cables.

Next, the operation will be described. When the propulsion direction of the front conduit 1 deviates from the planned line while the small diameter pipe 1 is being propelled,
The joystick 15b provided on the operation panel 15 is operated to correct the propulsion direction. The joystick 15b has four switches in the vertical direction, four switches in the horizontal direction, and one switch in the straight direction, so that a total of nine switches (both not shown) can be operated so that the correction direction of 13 directions can be selected. When operating in the direction you want to correct, the command signal is converted from the operation panel controller 15a into serial data,
It is sent to the lead conduit controller 12 in the lead conduit 1 via an electrical cable 16.

The front conduit controller 12 compares the sent command signal (target position) with the current position and calculates the stroke value of the direction correction cylinder 6 for correcting the direction to the target position, which is obtained. The solenoid valve 9 is controlled based on the value, and the cutter head 5 is swung in the correction direction by the direction correction cylinder 6. Further, the stroke of the direction correcting cylinder 6 is detected by the stroke detector 13, is input to the front conduit controller 12, and is compared with the proximity switch pattern table stored in advance in the front conduit controller 12,
The control is performed so that the measured value and the target value match.

The stroke detectors 13 for detecting the strokes of the one-way correction cylinder 6 are provided with two proximity switches 13b, respectively. Since the strokes are detected by turning on and off respectively, 8-bit data is formed. This data is converted into serial data and transmitted to the operation panel 15. The direction control is performed by referring to this data sent from the stroke detector 13 during the operation of the direction correcting cylinder 6, but if the soil is hard and the direction cannot be corrected, the swing pressure is held in the direction correcting cylinder 6. Signal interruption is enabled so that the propulsion can be continued. As a result, the cutter head 5 can be propelled even if it cannot immediately swing in the correction direction.
Propulsion downtime can be minimized.

When the proximity switch 13b of the stroke detector 13 detects the target value, the front conduit controller 12
Stops the operation of the direction correction cylinder 6 and sends the completion of the direction correction operation to the operation panel 15 and
The fact that the target position has been reached is displayed on the direction display plate 15c, so that it is possible to confirm that the direction correction has been completed by the direction display plate 15c. The above operation is shown in a flowchart of FIG.

[0019]

INDUSTRIAL APPLICABILITY As described in detail above, the present invention can be applied to a signal transmitting cable among electric cables connecting between a leading conduit controller provided in a leading conduit and an operation panel installed on the side of a starting shaft. Since the multiplex communication method of multiplexing and transmitting signals is adopted, the number of electric cables for transmitting signals can be significantly reduced as compared with the conventional one. As a result, the work of connecting the electric cable is reduced when adding the small diameter pipe, so the work of adding the small diameter pipe can be done efficiently in a short time and the accident such as cutting the electric cable during propulsion can be reduced. You can In addition, since the connector used for connecting the electric cable may be a small one, a device such as a leading conduit controller provided in the leading conduit can be downsized, which allows easy installation in a small space in the leading conduit. Even in the case of a failure, the number of inspection points is reduced due to the reduction in the number of cables, so that the failure point can be found early and the decrease in the operating rate of the small diameter pipe propulsion machine can be minimized.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a small diameter pipe propulsion device according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a leading conduit of a small diameter pipe propulsion machine according to an embodiment of the present invention.

3 is a sectional view taken along the line AA of FIG.

FIG. 4 is an enlarged view of the direction correcting cylinder provided in the front conduit of the small diameter pipe propulsion machine according to the embodiment of the present invention.

FIG. 5 is a block diagram of a leading conduit control device according to an embodiment of the present invention.

FIG. 6 is a circuit diagram of an electric cable used in the leading conduit control device according to the embodiment of the present invention.

FIG. 7 is a flow chart showing an operation of the leading conduit control device according to the embodiment of the present invention.

[Explanation of Codes] 1 Lead conduit 2 Small diameter pipe 3 Starting shaft 4 Propulsion device 5 Cutter head 6 Direction correction cylinder 12 Lead conduit controller 15 Control panel 16 Electric cable

Claims (1)

[Claims] 1. A small-diameter tube 2 having a tip conduit 1 attached to its tip.
In a small-diameter pipe propulsion device in which the propulsion device 4 installed in the starting shaft 3 propels the ground into the ground, and a plurality of direction correcting cylinders 6 controlled by a front conduit controller 12 at the tip of the front conduit 1. Is provided with a cutter head 5 which can be swung freely, and gives a command to the leading conduit controller 12 on the side of the starting shaft 3 and also controls the leading conduit controller 1.
A control panel 15 for displaying the control result sent from the control unit 2 is installed, and a signal electric cable 16 for transmitting a signal by a multiplex communication system is connected between the destination conduit controller 12 and the control panel 15. Leading tube control device for caliber tube propulsion machine.