JP2008308819A - Device for confirming enlargement and opening of enlarging blade in enlarging head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that occurs in confirming enlargement and opening of an enlarging blade in a fluid pressure type enlarging head of cylinder one-way driving type by confirming a pressure gage and a flow meter visually. <P>SOLUTION: In this device for confirming enlargement and opening of the enlarging blade in the enlarging head, a pressure transmitter and a flow rate transmitter are provided in a pressure fluid supply pipe for supplying pressure fluid into a cylinder, a pressure signal and a flow rate signal are transmitted to a control circuit, and an enlarging blade enlargement and opening completion signal is transmitted by the control circuit and is transmitted to an annunciator to inform a worker of enlargement and opening of the enlarging blade. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  According to the present invention, an expansion blade supported on an outer peripheral surface of a head rod so as to be able to expand and contract freely and a fluid pressure cylinder housed in the head rod can be interlocked with a forward / backward movement of the cylinder and an expansion / contraction motion of the expansion blade. The expansion blade is expanded by driving the cylinder in one direction by supplying a pressure fluid, and the expansion blade is closed when the expansion blade is expanded. In the one-cylinder one-drive hydraulic pressure expansion head (patent document) of the type that is opened and discharges the pressure fluid in the cylinder out of the system and opens the pressure fluid supply path, and then is performed by external force. The present invention relates to a device for confirming the period expansion.

  In the one-cylinder one-drive hydraulic pressure expansion head, the cylinder discharge port is normally opened when the expansion blade is expanded to the desired position, and the pressure fluid is discharged from the discharge port to the outside of the system. Decreases rapidly.

  Based on this knowledge, the present applicants, as a means for confirming the expansion of the expansion wing to the intended position, previously applied the pressure connected to the cylinder to supply the pressure fluid from the pump to the cylinder. A configuration in which a pressure gauge directly indicating the pressure of the pressure fluid flowing through the supply pipe and a flow meter directly indicating the flow rate of the pressure fluid are connected to the fluid supply pipe, respectively. At the time of expansion to the initial position, the sudden pressure drop indicated by the pressure gauge pointer is visually observed, and it is detected that the expansion blade has expanded to the initial position, and then the pressure is immediately detected after the expansion is detected. When a fluid is allowed to flow into the cylinder and a considerable amount of the pressure fluid is continuously flown, a method for determining that the desired expansion of the expansion blade has been completed has been widely implemented.

  However, in the method for confirming the expansion of the blades using the conventional means as described above, when the pressure and flow rate in the pressure fluid supply pipe fluctuate due to air entrapment in the pressure fluid supply pipe, etc., it is visually enlarged. There is a risk that it may be mistakenly determined that the blade has expanded to the intended position, and the pressure gauge pointer is constantly moving, so there is a risk that the pressure drop during the expansion of the expanded blade may be overlooked. .

Furthermore, in the actual work site, not only is there a difficulty in causing individual differences in the visual judgment of pressure gauges and flowmeters by workers, but it is actually easy to keep a close eye on pressure gauges and flowmeters during work. Not that.
JP2006-194022

  This invention makes it a subject to improve so that expansion completion of an expansion blade can be confirmed reliably except the fault of the visual judgment by the operator in a conventional apparatus.

As means for solving the above problems, the first invention of the present invention is:
In the cylinder one drive type hydraulic pressure expansion head,
A pressure transmitter for measuring the pressure of the pressure fluid flowing in the supply pipe and changing the pressure into an electric signal and transmitting the pressure fluid to a pressure fluid supply pipe connected to the cylinder to supply the pressure fluid to the cylinder; Measure the flow rate of the pressure fluid flowing in the supply pipe, connect each flow rate transmitter to change the flow rate into an electrical signal,
Send the pressure signal and flow rate signal to the control circuit,
In the control circuit, when the expanding blade expands to a predetermined position and the pressure in the cylinder suddenly decreases, a rapid decrease pressure signal is received from the pressure transmitter, and the flow rate transmitter is thereafter received from the reception time point. Start to integrate the flow rate received from, and when the integrated amount reaches a certain amount, it is configured to send an expansion completion signal,
An expansion completion notification device is provided for receiving the expansion completion signal and notifying the operator of the completion of expansion of the expansion wing.
We propose an expansion wing expansion confirmation device for the expansion head.

The second invention of the present application is
In addition to removing the expansion completion notification device in the first invention, an electromagnetic valve for opening and closing the supply pipe is connected to the pressure fluid supply pipe, and the expansion completion signal is sent to the electromagnetic valve to close the electromagnetic valve. We propose an expansion wing expansion confirmation device for the expansion head.

  According to the first invention of the present application, the pressure transmitter reliably detects a sudden pressure drop in the cylinder when the pressure fluid in the cylinder is discharged from the discharge port when the expansion blade is expanded by the cylinder. The amount of the pressure fluid that flows into the cylinder after the time when the pressure signal of the sudden pressure drop in the cylinder is received in the control circuit can be automatically transmitted to the control circuit. A constant flow rate can be set uniformly by integration, and when a certain amount of pressure fluid has flown into the cylinder, an expansion completion signal for the expansion blade is sent to the alarm device, and the expansion completion signal is sent to the operator. Accordingly, the operator can manually close the pressure fluid supply pipe.

  In this way, it is possible to eliminate the conventional visual hazards of workers.

  According to the second aspect of the present invention, the supply valve can be automatically closed by exciting the solenoid valve of the pressure fluid supply pipe by the expansion completion signal of the expansion blade.

The “control circuit” in the present invention includes a combination of a computer, a sequencer, other various devices, circuits, and the like.
The “fluid pressure cylinder” in the present invention includes a hydraulic cylinder, a hydraulic cylinder, and a pneumatic cylinder.
Further, the “expansion completion notification device” includes a notification device using light such as a lamp, a notification device using sound such as a buzzer, and various other devices.
In addition, the "external force" that closes and contracts the expansion wing includes the weight of the excavation head, etc. fixed to the head rod, the earth and sand resistance reaching the expansion wing, the pressing force at the lower end of the hollow pile when used for press-fitting in the hollow pile, etc. There is.

  An example of the one-cylinder hydraulic expansion head is shown in FIG. In the figure, the cylinder tube (2) of the piston-fixed hydraulic cylinder is inserted into the hollow head rod (1) so as to be slidable in the axial direction, and the lower end of the cylinder tube (2) is inserted into the head rod (1). A piston rod (4) protruding from the lower end of the opening so as to freely advance and retract and having one end fixed to the piston (3) in the tube (2) is slidably passed through the closed upper end of the cylinder tube (2). Projecting upward, the projecting upper end is fixed inside the head rod (1), and a heavy-duty excavation head (5) projects from the projecting lower end of the cylinder tube (2). The bases of the enlarged wings (6) and (6) are pivotally supported on the bracket, and the links (7) and (7) are mounted on the bracket protruding from the outer peripheral surface of the lower end of the head rod (1). When one end of The other end portion the expanding blade (6), are respectively axially supported at an intermediate portion (6).

  The lower end portion of the pressure water supply pipe (8) passed through the excavation rod (R) is inserted into the head rod (1) of such an enlargement head, and the piston rod (4) is inserted vertically into the insertion end. A pressure water supply port (11) that connects the passed pressure water guide hole (9) and opens to the rod side space (10) in the cylinder tube (2) at the lower end of the piston rod (4). And the pressure water discharge ports (12) and (13) are opened on the peripheral walls of the cylinder tube (2) and the head rod (1), respectively. When the cylinder tube (4) ascends as shown in FIG. 2 and the expanding blades (6) and (6) expand horizontally, the rod-side space (10) is opened to coincide with each other. In the positional relationship of releasing the pressure water in the space (10) to the outside That.

  The expansion confirmation devices for the expansion blades (6) and (6) are as follows.

  The pressure water supply pipe (8) vertically passed through the excavation rod (R) is connected to the flexible pressure water supply pipe (8 ′) via a rotary joint at the upper end of the excavation rod (R), and the flexible supply pipe ( 8 ′) to the ground, and as shown in FIG. 1, a hydraulic pump (14) for pumping water into the supply pipe (8 ′) is connected to the rear end of the supply pipe (8 ′), and then the above supply Manual switching valve (15) for switching between opening and closing the pipe (8 ') and returning (opening) the pressure water in the supply pipe to the water tank, continuously measuring the pressure of the pressure water flowing through the supply pipe (8'), Measures the flow rate per unit time (for example, 1 second) of the pressure water flowing in the supply pipe (8 ') and converts it into an electrical signal and transmits it as an electrical signal. A flow rate transmitter (17) is connected to each.

  In addition, each signal of the pressure transmitter (16) and the flow rate transmitter (17) is transmitted to the sequencer (18) in this example, and the sequencer transmits the required program and each pressure signal sent from the pressure transmitter. Is received and a continuous change in pressure is recorded, and a calculator for receiving a flow rate signal per unit time from the flow rate transmitter (17) and integrating the flow rate is provided.

  When the water pressure in the pressure water supply pipe (8 ′) is suddenly reduced by the program, when the pressure signal of the sudden drop is received from the pressure transmitter (16), the subsequent time from the reception time is received. When accumulation of the flow rate is started and the accumulated flow rate reaches a constant flow rate (for example, approximately three times the capacity of the cylinder tube (2)), an expansion completion signal is sent to the notification lamp (19) The lamp (19) is configured to be lit.

The operation of the above example will be described together with the enlarged excavation work.
With the enlarged wings (6) and (6) shown in FIG. 2 closed, the excavation rod (R) is rotated to start excavation to the ground. At the same time, the switching valve (15) is switched to the opening of the supply pipe (8 ') and the pressure water from the pump (14) is supplied to the piston rod (4) through the supply pipes (8') and (8). It feeds into the guide hole (9) and is supplied into the rod side space (10) of the cylinder tube (2) from the supply port (11) at the lower end thereof, thereby raising the cylinder tube (2) and expanding the blade (6) Open (6).

  When the expansion wings (6) and (6) are opened horizontally as shown in FIG. 2, the discharge ports (12) and (13) are matched, and the pressure water in the rod side space (10) of the cylinder becomes the discharge port. The water pressure in the rod-side space (10) is drastically reduced due to the discharge from (12) and (13) to the outside.

  The sudden drop in water pressure in the cylinder is measured by the pressure transmitter (16), and the drop pressure signal is received by the sequencer (18). Meanwhile, the pressure water pumped from the pump (14) is sent into the rod side space (10) of the cylinder tube, and continues to be discharged from the discharge ports (12), (13), and the expanding blades (6), (6 ) In the expanded state.

  When the integrated amount of pressure water in the sequencer (18) reaches a certain amount, the expansion of the expansion blades (6) and (6) may be considered to be in a stable state. Therefore, it is assumed that the expansion of the expansion blade has been completed, and an expansion completion signal is sent to the notification lamp (19) to light it.

  When the worker knows that the expansion blades (6) and (6) have been expanded by turning on the notification lamp (19), the switching valve (15) is manually closed to stop the supply of pressure water. The cylinder tube (2) is slightly lowered due to the weight of the drilling head (5), but the discharge port (12) is immediately closed and the entire pressure water circuit is closed, so that the expansion blades (6) and (6) are expanded. Held open. Therefore, the excavation rod (R) is rotated and the enlarged excavation is performed by the enlarged blades (6) and (6).

  When the expansion excavation is completed, if the switching valve (15) is switched back to the tank of pressure water and the pressure water circuit is opened, the cylinder tube (2) descends due to the weight of the excavation head (5) and expands. The wings (6) and (6) are closed. Thereby, the excavation rod (R) can be pulled out to the ground.

  As another embodiment of the present invention, the notification lamp (19) in the above example is removed, the manual switching valve (15) in the above example is replaced with an electromagnetic switching valve, and an expansion blade expansion completion signal is sent from the sequencer (18). An example is also obtained in which the switching valve is automatically switched to the closed state by sending it to the electromagnetic switching valve, and the other structure is substantially the same as the above example.

It is a block diagram which shows the principal part of the expansion blade expansion confirmation apparatus by this invention. It is a partial longitudinal cross-sectional view of a cylinder one drive type hydraulic expansion head.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Head rod 2 Cylinder tube 3 Piston 6 Expanding blade 12, 13 Release port 8 Pressure water supply pipe 15 Manual switching valve 16 Pressure transmitter 17 Flow rate transmitter 18 Sequencer 19 Notification lamp R Drilling rod

Claims (2)

In the cylinder one drive type hydraulic pressure expansion head,
A pressure transmitter for measuring the pressure of the pressure fluid flowing in the supply pipe and changing the pressure into an electric signal and transmitting the pressure fluid to a pressure fluid supply pipe connected to the cylinder to supply the pressure fluid to the cylinder; Measure the flow rate of the pressure fluid flowing in the supply pipe, connect each flow rate transmitter to change the flow rate into an electrical signal,
Send the pressure signal and flow rate signal to the control circuit,
In the control circuit, a rapid decrease pressure signal is received from the pressure transmitter when the expansion blade expands to a predetermined position and the pressure in the cylinder rapidly decreases, and the flow rate transmitter is received after the reception time. Start to integrate the flow rate received from, and when the integrated amount reaches a certain amount, it is configured to send an expansion completion signal,
An expansion completion notification device is provided for receiving the expansion completion signal and notifying the operator of the completion of expansion of the expansion wing.
Expansion wing expansion confirmation device for the expansion head.   In addition to excluding the expansion completion notification device, an electromagnetic valve for opening and closing the supply pipe is connected to the pressure fluid supply pipe, and the expansion completion signal is sent to the electromagnetic valve to close the electromagnetic valve. The expansion blade expansion confirmation apparatus in the expansion head according to Item 1.

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