JP2015081444A - Tubing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tubing device with a hydraulic circuit and an electric circuit for preventing deterioration of grip force when a casing tube is re-gripped.SOLUTION: Opening side pilot solenoid valves 44 and 45 are provided in opening side pilot paths 33a and 35a for transmitting pressure of chuck cylinder grip circuits 31 and 32 to chuck opening side sequence valves 33 and 35. The opening side pilot solenoid valves become states in which the pressure of the chuck cylinder grip circuits can be transmitted to the chuck opening side sequence valves when solenoids 44a and 45a are in non-conduction states, and become states in which transmission of the pressure of the chuck cylinder grip circuits to the chuck opening side sequence valves is shielded when the solenoids are in conduction states. When the casing tube is re-gripped, opening switches 75 and 76 for making the opening side solenoid into the non-conduction state are manually operated.

Description

  The present invention relates to a tubing device, and more particularly to a tubing device that press-fits a casing tube into the ground and pulls it out from the ground while holding the casing tube between a chuck frame and a sub-chuck.

  In the all-casing method, the tubing device that press-fits the casing tube into the ground or pulls it out from the ground is provided with a main chuck on the rotating body that is raised and lowered by the lifting cylinder in order to prevent the casing tube from dropping. A sub-chuck is provided on a base frame installed on the ground so that either the main chuck or the sub-chuck always holds the casing tube. For this reason, in the hydraulic circuit that supplies hydraulic oil to the main chuck cylinder that opens and closes the main chuck and the sub chuck cylinder that opens and closes the sub chuck, the sub chuck holds the casing tube when the main chuck is opened. When the main chuck is operated in the opening direction and the sub chuck is released, a sequence valve is installed to operate the sub chuck in the opening direction after the main chuck has gripped the casing tube. (For example, refer to Patent Document 1).

JP 2005-330655 A

  However, since the pressure for opening the sequence valve is set to a pressure lower than the maximum pressure at which each chuck cylinder grips each chuck, the casing tube is moved from the main chuck to the sub chuck or from the sub chuck to the main chuck. When gripping is changed, the gripping force of each chuck is temporarily lower than the maximum gripping force. For this reason, when the weight of the casing tube is extremely close to the weight that can be gripped by the maximum gripping force of each chuck, the casing tube may slide down due to the influence of the surface condition of the casing tube.

  Therefore, the present invention can exert the maximum gripping force of each chuck when gripping the casing tube, and can reliably grip the casing tube from the main chuck to the subchuck or from the subchuck to the main chuck. An object of the present invention is to provide a tubing device having a hydraulic circuit and an electric circuit that can be used.

  In order to achieve the above object, a tubing device according to the present invention is provided with a rotating body that is moved up and down by an elevating cylinder above a base frame installed on the ground, a main chuck is provided on the rotating body, and a sub chuck is mounted on the base frame. A hydraulic circuit in which one of the main chuck and the sub chuck holds the casing tube, an electric circuit for operating the hydraulic circuit, and a remote controller for operating the hydraulic circuit and the electric circuit; The hydraulic circuit includes a main chuck cylinder gripping circuit that operates the main chuck cylinder in a direction in which the main chuck grips the casing tube and hydraulic fluid from the hydraulic pump. Subchat in the gripping direction A chuck control valve that switches to either a sub chuck cylinder gripping circuit that operates the cylinder, and a branch direction from the main chuck cylinder gripping circuit via a sub chuck opening side sequence valve, in which the sub chuck opens the casing tube A sub chuck cylinder opening circuit for operating the sub chuck cylinder, and a branch valve from the sub chuck cylinder holding circuit via a main chuck opening side sequence valve, and the main chuck cylinder is opened in a direction in which the main chuck opens the casing tube. A sub chuck opening side pilot path that transmits the pressure of the main chuck cylinder gripping circuit to the sub chuck opening side sequence valve. When the sub-side solenoid provided on the sub-chuck opening side pilot solenoid valve is in the non-energized state, the sub-chuck opening side pilot solenoid valve is configured to reduce the pressure of the main chuck cylinder gripping circuit. When the sub-chuck opening side sequence valve can be transmitted, and when the sub-side solenoid is energized, the main chuck cylinder gripping circuit pressure is blocked from being transmitted to the sub-chuck opening side sequence valve. A main chuck opening side pilot solenoid valve is provided in the main chuck opening side pilot path for transmitting the pressure of the sub chuck cylinder gripping circuit to the chuck opening side sequence valve, and the main chuck opening side pilot solenoid valve is provided. When the main solenoid provided in the main chuck opening side pilot solenoid valve is in a non-energized state, the main valve is in a state where the pressure of the sub chuck cylinder gripping circuit can be transmitted to the main chuck opening side sequence valve. Is in an energized state, the pressure of the sub chuck cylinder gripping circuit is cut off from being transmitted to the main chuck opening side sequence valve, and the remote control is connected to the sub side solenoid and the remote control connection terminal connected to the main side solenoid. A sub-chuck opening side switch for turning on / off the energization state of the sub-side solenoid, and a main chuck opening-side switch for turning on / off the energization state of the main side solenoid. The above Buchakku opening side switch and the main chuck opening-side switch is characterized in that the ON position to the sub-side solenoid and the main side solenoid energized state is set to a steady state.

  Further, the tubing device of the present invention is provided with a main chuck side hydraulic switch that is energized when the pressure of the main chuck cylinder gripping circuit rises to a preset main chuck gripping pressure in the main chuck cylinder gripping circuit. The sub chuck cylinder gripping circuit is provided with a sub chuck side hydraulic switch that is energized when the pressure of the sub chuck cylinder gripping circuit rises to a preset sub chuck gripping pressure, and the remote controller has the main chuck A main chuck grip indicator light that lights up when the chuck side hydraulic switch is energized, and a sub chuck grip indicator light that lights up when the sub chuck side hydraulic switch is energized; , The remote control is the main chuck side oil When the switch and the sub-chuck-side oil pressure switch is turned both energized, it is characterized by comprising an operation regulating electrical circuit for regulating the rotation operation and the stretch operation of the elevating cylinder of the rotating body.

  According to the tubing device of the present invention, when switching the grip of the casing tube from the main chuck to the sub chuck with the remote controller connected, the main chuck will not open unless the main chuck opening side switch of the remote controller is operated, Similarly, when the grip is switched from the sub chuck to the main chuck, the sub chuck is not opened unless the sub chuck opening side switch of the remote controller is operated. Therefore, a predetermined chuck can be opened by operating the predetermined opening side switch after the operator visually confirms the gripping state or confirms the pressure display of the pressure detecting means. Safety equivalent to operating the sub chuck independently can be secured. As a result, when the casing tube is gripped, the maximum gripping force of each chuck can be exerted, and the casing tube can be reliably gripped from the main chuck to the sub chuck or from the sub chuck to the main chuck.

  Furthermore, the gripping state can be easily confirmed by providing each gripping indicator light. Further, by providing the operation regulating electric circuit, it is possible to prevent an accident or damage to the equipment caused by rotating the rotating body or extending and retracting the lifting cylinder when both chucks are gripped.

1 is a circuit diagram showing a hydraulic circuit and an electric circuit when a remote controller for opening a chuck is connected, showing a first embodiment of a tubing device of the present invention. FIG. Similarly, it is a circuit diagram showing a hydraulic circuit and an electric circuit when a remote control is not connected. FIG. 9 is a circuit diagram showing a hydraulic circuit and an electric circuit when a remote controller for opening a chuck is connected, showing a second embodiment of the tubing device of the present invention. FIG. 9 is a circuit diagram showing a hydraulic circuit and an electric circuit when a remote controller for opening a chuck is connected, showing a third embodiment of the tubing device of the present invention.

  First, in the first embodiment shown in FIGS. 1 and 2, the tubing device shown in this embodiment includes a tubing device main body 10, a hydraulic unit 50, and a remote controller 70. The unit 50 is connected by three hydraulic hoses 10a, 10b, and 10c, the hydraulic unit 50 and the remote controller 70 are connected by a hydraulic unit side connection cable 70a, and the tubing device main body 10 and the remote controller 70 are detachable main bodies. It can be connected with the side connection cable 70b.

  The tubing device main body 10 includes a base frame 11 installed on the ground, and a drive frame 13 and a chuck frame 14 provided above the base frame 11 through a lifting cylinder 12 so as to be lifted and lowered. 11, at the center of each of the drive frame 13 and the chuck frame 14, an insertion hole 16 for inserting the casing tube 15 in the vertical direction is provided on the same axis.

  Rotating bodies 18 are respectively provided around the insertion holes 16 of the drive frame 13 and the chuck frame 14 via bearings 17, and the casing tube 15 is attached to the inner periphery of each rotating body 18 by approaching each other. A wedge-shaped main chuck 19 formed so as to be gripped is provided, and the drive chuck 13 and the chuck frame 14 are brought close to each other between the drive frame 13 and the chuck frame 14 so that the main chuck 19 is gripped (closed). And a main chuck cylinder 20 is provided for separating the drive frame 13 and the chuck frame 14 to open the main chuck 19 (open state).

  The drive frame 13 is provided with a casing tube rotating hydraulic motor 21 for rotating the casing tube 15 held by the main chuck 19. Further, the base frame 11 is provided with a sub-chuck 22 that clamps and holds the outer periphery of the casing tube 15, and a sub-chuck cylinder 23 that opens and closes the sub-chuck 22.

  The hydraulic circuit of the tubing device main body 10 that operates the main chuck cylinder 20 and the sub chuck cylinder 23 is configured such that the main chuck 19 is moved to the casing tube by hydraulic oil of a predetermined pressure supplied from the hydraulic unit 50 via a hydraulic hose 10a. The main chuck cylinder gripping circuit 31 that operates the main chuck cylinder 20 in the gripping direction 15 and the hydraulic fluid supplied from the hydraulic unit 50 through the hydraulic hose 10b and the sub chuck 22 causes the casing tube 15 to move. A sub-chuck cylinder gripping circuit 32 for operating the sub-chuck cylinder 23 in the gripping direction, and a branch from the main chuck cylinder gripping circuit 31 via a sub-chuck opening side sequence valve 33, so that the sub-chuck 22 is connected to the case. Branching from the sub-chuck cylinder opening circuit 34 for operating the sub-chuck cylinder 23 in the direction to open the ring tube 15 and the main chuck opening side sequence valve 35 from the sub-chuck cylinder gripping circuit 32. A main chuck cylinder opening circuit 36 for operating the main chuck cylinder 20 in a direction to open the casing tube 15.

  A pilot operation double check valve 37 for maintaining the pressure of the main chuck cylinder 20 is provided in the vicinity of the main chuck cylinder 20 in the main chuck cylinder gripping circuit 31 and the main chuck cylinder opening circuit 36, and the pilot operation double check Between the valve 37 and the main chuck cylinder 20, a main chuck side accumulator 38 for holding the gripping pressure in the main chuck 19 and the pressure of the main chuck cylinder gripping circuit 31 acting on the main chuck cylinder 20. Is provided with a main chuck side hydraulic switch 39 which is turned on when the pressure rises to a preset gripping pressure.

  The sub chuck cylinder gripping circuit 32 is provided with a manual stop valve 40 for controlling the operation of the sub chuck cylinder 23 and a pilot check valve 41 for maintaining the gripping pressure in the sub chuck cylinder 23. Between the pilot check valve 41 and the sub chuck cylinder 23, a sub chuck side accumulator 42 for holding the gripping pressure in the sub chuck 22 and a sub chuck cylinder gripping circuit acting on the sub chuck cylinder 23 are provided. There is provided a sub chuck side hydraulic switch 43 which is turned on when the pressure of 32 rises to a preset gripping pressure.

  A sub chuck opening side pilot solenoid valve 44 is provided in the sub chuck opening side pilot path 33a for transmitting the pressure of the main chuck cylinder gripping circuit 31 to the sub chuck opening side sequence valve 33. A main chuck opening side pilot solenoid valve 45 is provided in the main chuck opening side pilot path 35 a for transmitting the pressure of the sub chuck cylinder gripping circuit 32 to the valve 35.

  The pilot solenoid valves 44 and 45 are in a state where the pilot paths 33a and 35a are cut off when the solenoids 44a and 45a are energized, and when the solenoids are not energized, the pilot paths 33a and 45a are actuated by springs. It is formed so that 35a is opened. Therefore, by energizing the solenoids 44a and 45a, the operation of the sequence valves 33 and 35 can be stopped and kept in the closed state.

  The electric circuits of the solenoids 44a and 45a and the hydraulic switches 39 and 43 are grouped into a remote control connection terminal 46 for detachably connecting the main body side connection cable 70b of the remote control 70. The sequence valves 33 and 35 and the pilot solenoid valves 44 and 45 are respectively provided with drain circuits 47 for returning the drain to the hydraulic unit 50 via the hydraulic hose 10c.

  The hydraulic unit 50 includes a spring center type three-position double solenoid valve that switches the flow direction of the hydraulic oil boosted by the hydraulic pump 51 to either the main chuck cylinder gripping circuit 31 or the sub chuck cylinder gripping circuit 32. A chuck control valve 52, a lift control valve 53 for expanding and contracting the lift cylinder 12, a rotation control valve 54 for rotating the casing tube rotating hydraulic motor 21, and a relief provided at a predetermined position. And a valve 55.

  A remote controller 70 that electrically controls the hydraulic unit 50 includes a main / sub switch 71 and a main grip change start switch 72 that operate the chuck control valve 52, and a lift switch 73 that operates the lift control valve 53, A sub-chuck opening switch 75 for controlling energization to the solenoid 44a of the sub-chuck opening pilot solenoid valve 44, and a main chuck opening-side pilot solenoid. A main chuck opening switch 76 that controls energization of the solenoid 45a of the valve 45, a main chuck grip confirmation lamp 77 that is turned on when the main chuck side hydraulic switch 39 is turned on, and a main chuck grip switch. The main chuck gripping relay 78 that turns on the latch portion 78a, the sub chuck grip confirmation lamp 79 that lights when the sub chuck side hydraulic switch 43 is turned on, and the sub chuck that turns on the sub chuck grip switch portion 80a. When the gripping relay 80 and the gripping switch portions 78a and 80a of the main chuck gripping relay 78 and the sub chuck gripping relay 80 are simultaneously turned on, the energization to the elevation switch 73 and the rotation direction switch 74 is cut off. And an operation restriction relay 81 that operates an operation restriction switch portion 81a serving as an operation restriction electric circuit.

  When the casing tube 15 is pulled out from the ground, the lifting / lowering cylinder 12 is shortened and the casing tube 15 is gripped by the main chuck 19, and the casing tube rotating hydraulic motor 21 is appropriately operated to move the casing tube 15 up and down. The casing tube 15 is pulled out from the ground by extending the cylinder 12. When the elevating cylinder 12 is in the extended state, the elevating cylinder 12 and the casing tube rotating hydraulic motor 21 are stopped, and thereafter, a grip changing operation for switching the grip of the casing tube 15 from the main chuck 19 to the sub chuck 22 is performed.

  Specific examples of the grip changing operation for switching from the main chuck 19 to the sub chuck 22 include the operation of the remote control 70 in a state where the remote control 70 is connected to the remote control connection terminal 46 of the tubing device main body 10 via the main body side connection cable 70b, The flow of current in the circuit and the flow of hydraulic oil in the hydraulic circuit will be described below with reference to FIG. As for the current flow, the flow on the positive side will be described, and the description on the negative side (ground side) will be omitted.

  The state at the start of the gripping operation is that the main / sub switch 71, the lift switch 73 and the rotation direction switch 74 of the remote controller 70 are all neutral OFF, the chuck control valve 52, the lift switch The control valve 53 and the rotation control valve 54 are all in the neutral position because no current flows through the solenoids, and the flow paths in the control valves 52, 53, 54 are all released to the tank 56. It has become. On the other hand, the main chuck 19 is in a state of gripping the casing tube 15 with a predetermined pressure by the action of the pilot operation double check valve 37, and the pressure of the main chuck cylinder gripping circuit 31 acting on the main chuck cylinder 20. Is a pre-set gripping pressure.

  Therefore, since the main chuck side hydraulic switch 39 is ON, the current from the power source 91 is supplied to the wiring 91a, the hydraulic unit side connection cable 70a, the wirings 92 and 92a, the main body side connection cable 70b, the wiring 93a, and the main chuck. Side hydraulic switch 39, wiring 93b, main body side connection cable 70b, wiring 92b, main chuck gripping confirmation lamp 77 is lit, main chuck gripping relay 78 is activated, and main chuck gripping switch portion 78a is turned on. ing.

  Since the sub chuck opening switch 75 and the main chuck opening switch 76 are both in the steady state, the wiring 92 passes through the sub chuck opening switch 75, the main body side connection cable 70b, and the wiring 93c. Since a current flows through the solenoid 44a of the sub chuck opening side pilot solenoid valve 44, the sub chuck opening side pilot solenoid valve 44 is in a state of blocking the sub chuck opening side pilot path 33a. Similarly, since a current flows from the wiring 92 through the main chuck opening switch 76, the main body side connection cable 70b, and the wiring 93d to the solenoid 45a of the main chuck opening side pilot solenoid valve 45, the main chuck opening side pilot solenoid valve 45 is The main chuck opening side pilot path 35a is cut off.

  To change the grip from the main chuck 19 to the sub chuck 22, first, the main / sub switch 71 is switched to the sub chuck closing side (main chuck opening side) contact 71a, and then the main grip changing start switch 72 is turned ON. To do. As a result, the current from the power source 91 is connected to the wiring 91a, the hydraulic unit side connection cable 70a, the wirings 92 and 92c, the contact 71a of the main / sub changeover switch 71, the wiring 92d, the main reshuffling start switch 72, and the hydraulic unit side connection. The cable flows through the cable 70a and the wiring 91b to the sub chuck closing side solenoid 52a of the chuck control valve 52, and the spool of the chuck control valve 52 is moved to the left sub chuck closing side in FIG.

  When the spool of the chuck control valve 52 moves to the sub-chuck closing side, the hydraulic oil boosted by the hydraulic pump 51 passes from the chuck control valve 52 through the sub-chuck closing side circuit 57 and the hydraulic hose 10b, and the main body of the tubing device. Supplied to the sub chuck cylinder gripping circuit 32 of the section 10.

  The hydraulic oil supplied to the sub chuck cylinder gripping circuit 32 does not flow in the direction of the main chuck cylinder opening circuit 36 because the main chuck opening side sequence valve 35 is closed by the action of the spring, and the stop valve 40, It is supplied to the closing side of the sub chuck cylinder 23 through the pilot check valve 41. Thereby, the sub chuck 22 is closed and the casing tube 15 is gripped, and the hydraulic oil is held in the sub chuck side accumulator 42 at a predetermined pressure.

  At this time, from the opening side of the sub chuck cylinder 23, the hydraulic oil in the cylinder is pushed out to the sub chuck cylinder opening circuit 34, passes through the check valve 33 b of the sub chuck opening side sequence valve 33, and the main chuck cylinder gripping circuit 31. Then, the hydraulic hose 10a, the main chuck closing side circuit 58, and the chuck control valve 52 are returned to the tank 56.

  When the pressure in the sub chuck cylinder gripping circuit 32 rises to a preset gripping pressure (maximum pressure), for example, 25 MPa, and the sub chuck 22 securely grips the casing tube 15, the sub chuck side hydraulic switch 43 is turned ON, and flows into the wirings 92 and 92a, the main body side connection cable 70b and the wiring 93e, the sub chuck side hydraulic switch 43, the wiring 93f, the main body side connection cable 70b and the wiring 92e in the remote controller 70, and the sub chuck holding confirmation lamp 79. Is lit, the sub chuck gripping relay 80 is activated, and the sub chuck gripping switch portion 80a is turned on.

  This state is a state in which the main chuck 19 and the sub chuck 22 grip the casing tube 15 with a preset gripping force (maximum gripping force), respectively, and the main chuck grip confirmation lamp 77 and the sub chuck grip confirmation lamp 79. Are simultaneously turned on, and the main chuck grip switch portion 78a of the main chuck grip relay 78 and the sub chuck grip switch portion 80a of the sub chuck grip relay 80 are simultaneously ON.

  Since both grip switch portions 78a and 80a are ON, a current flows from the wiring 92 through the grip switch portions 78a and 80a to the operation restricting relay 81, the operation restricting switch portion 81a is turned OFF, and the up / down switching is performed. The power supply to the switch 73 and the rotation direction changeover switch 74 is cut off. As a result, even if the up / down selector switch 73 or the rotation direction selector switch 74 is operated, no current flows through the solenoids of the up / down control valve 53 or the rotation control valve 54, and the control valves 53, 54 are in a neutral state. Hold. Therefore, when the casing tube 15 is gripped by both the main chuck 19 and the sub chuck 22, it is possible to restrict the operation of extending the elevating cylinder 12 or rotating the casing tube rotating hydraulic motor 21. .

  Thus, after confirming that the sub-chuck grip confirmation lamp 79 is lit and that the sub-chuck 22 grips the casing tube 15 with a predetermined pressure, or a sub-chuck cylinder gripping circuit with a pressure gauge provided at an appropriate position. When the main chuck opening switch 76 is turned OFF after confirming the pressure of 32 or the like, the electric circuit from the wiring 92 to the wiring 93d via the main body side connection cable 70b is cut off, and the main chuck opening side pilot solenoid valve 45 is cut off. Since the solenoid 45a is in a non-energized state, the main chuck opening side pilot solenoid valve 45 is opened through the main chuck opening side pilot path 35a by the action of the spring.

  By opening the main chuck opening side pilot path 35a, the pressure of the sub chuck cylinder gripping circuit 32 acts on the main chuck opening side sequence valve 35 to open the main chuck opening side sequence valve 35. The hydraulic fluid in the tank flows into the main chuck cylinder opening circuit 36 through the main chuck opening side sequence valve 35, and is supplied to the opening side (extension side) of the main chuck cylinder 20 through the opening side of the pilot operation double check valve 37. The At this time, the hydraulic oil in the sub chuck cylinder gripping circuit 32 flows into the main chuck cylinder opening circuit 36, whereby the pressure in the sub chuck cylinder gripping circuit 32 temporarily decreases, but the pilot check valve 41 is automatically closed. Therefore, the hydraulic oil does not flow out from the closed side of the sub chuck cylinder 23, and the closed side of the sub chuck cylinder 23 is held at a predetermined gripping pressure by the action of the sub chuck side accumulator 42.

  Further, when the pressure of the main chuck cylinder opening circuit 36 increases due to the inflow of hydraulic oil, the closing side of the pilot operation double check valve 37 opens, and the hydraulic oil is pushed out from the closing side of the main chuck cylinder 20 to the main chuck cylinder gripping circuit 31. Along with the hydraulic oil in the main chuck side accumulator 38, the tank passes through the hydraulic chuck hose 10a, the main chuck closing side circuit 58, and the chuck control valve 52 from the main chuck cylinder gripping circuit 31 through the closing side of the pilot operation double check valve 37. Return to 56. As a result, the main chuck cylinder 20 is extended and the drive frame 13 and the chuck frame 14 are separated from each other, so that the main chuck 19 is opened, and the open side of the main chuck cylinder 20 is operated by the pilot operation double check valve 37. Is maintained, the main chuck 19 is held in an open state.

  At the same time, when the pressure of the main chuck cylinder gripping circuit 31 decreases, the main chuck side hydraulic switch 39 is turned OFF, the main chuck grip confirmation lamp 77 is turned off, and the main chuck grip relay 78 is deenergized so that the main chuck is turned off. The grip switch part 78a is turned off. Further, since the operation restriction relay 81 is also de-energized when the main chuck grip switch part 78a is turned off, the operation restriction switch part 81a is turned on and the up / down changeover switch 73 and the rotation direction changeover switch 74 can be operated. It becomes a state. Further, by returning the main / sub switch 71 to the neutral position, the chuck control valve 52 also returns to the neutral position by the action of the spring.

  After confirming that the main chuck 19 is opened by the distance between the drive frame 13 and the chuck frame 14 and turning off the main chuck opening switch 76, the elevator cylinder 12 is shortened by operating the elevator switch 73. Then, the gripping of the casing tube 15 is switched from the sub chuck 22 to the main chuck 19 and the drawing operation of the casing tube 15 is resumed.

  When switching the gripping of the casing tube 15 from the sub chuck 22 to the main chuck 19, the sub chuck opening side pilot solenoid valve 44 shuts off the sub chuck opening side pilot path 33a by energizing the solenoid 44a, and the sub chuck opening side. While the sequence valve 33 is closed, the main / sub switch 71 is switched to the main chuck closing side (sub chuck opening side) contact 71b, the main chuck closing side solenoid 52b of the chuck control valve 52 is energized, and the spool is turned on. By moving to the main chuck closing side, the pressure of the main chuck cylinder gripping circuit 31 is increased to the set pressure, and after confirming that the main chuck gripping confirmation lamp 77 is lit, the sub chuck opening switch 5 is turned off, the energization to the solenoid 44a is cut off, and the sub chuck opening side pilot solenoid valve 44 opens the sub chuck opening side pilot path 33a so that the sub chuck opening side sequence valve 33 is opened. This can be done by flowing hydraulic oil from the cylinder gripping circuit 31 to the sub chuck cylinder opening circuit 34.

  On the other hand, as shown in FIG. 2, when the tubing device main body 10 and the remote controller 70 are not connected by the main body side connection cable 70b, current is not supplied from the wires 93c and 93d to the solenoids 44a and 45a. In the sub chuck opening side pilot solenoid valve 44 and the main chuck opening side pilot solenoid valve 45, the sub chuck opening side pilot path 33a and the main chuck opening side pilot path 35a are open.

  That is, when the grip of the casing tube 15 is switched from the main chuck 19 to the sub chuck 22, when the pressure of the sub chuck cylinder gripping circuit 32 reaches the pressure set in the main chuck opening side sequence valve 35, for example, 20 MPa, Since the chuck opening side sequence valve 35 is opened, the operating oil in the sub chuck cylinder gripping circuit 32 flows into the main chuck cylinder opening circuit 36 and is supplied to the opening side of the main chuck cylinder 20, whereby the main chuck 19. Opens. Thereafter, the pressure of the sub-chuck cylinder gripping circuit 32 rises to a predetermined pressure, for example, 25 MPa, and enters a predetermined gripping state. Even when switching from the sub chuck 22 to the main chuck 19, when the pressure of the main chuck cylinder gripping circuit 31 becomes the set pressure of the sub chuck opening side sequence valve 33, the sub chuck opening side sequence valve 33 opens and the sub chuck cylinder opening circuit 34. Then, the hydraulic oil flows, and the sub chuck cylinder 23 is moved to the open side to release the grip of the casing tube 15 by the sub chuck 22.

  Therefore, when the tubing device main body 10 and the remote controller 70 are not connected with the main body side connection cable 70b, the casing tube 15 is automatically regrown by the operation of the main / sub switch 71. The gripping pressure of the casing tube 15 temporarily drops to 20 MPa when the grip is changed, but this is not a problem during normal general construction, and the main body side connection cable 70b is usually used. Instead, it is only necessary to automatically change the grip. On the other hand, when the casing tube 15 is very heavy, such as when the casing tube 15 is thick or the construction depth is deep, the main body side connection cable 70b connects the tubing device main body 10 and the remote control 70. After confirming that both the main chuck 19 and the sub-chuck 22 have surely gripped the casing tube 15 with a preset gripping force, the gripping operation is performed by opening the chuck on the opening side. It is possible to prevent the occurrence of an accident in which the gripping pressure is reduced and the casing tube 15 is slid down during replacement.

  Further, by providing grip confirmation lamps 77 and 79 which are turned on when the main chuck 19 and the sub chuck 22 are gripped of the casing tube 15 with a preset gripping pressure, the states of the chucks 19 and 22 are changed. It can be confirmed easily and reliably. In addition, when both chucks 19 and 22 are in the gripping state, the main chuck gripping relay 78, the sub chuck gripping relay 80, and the operation control functioning as an operation restricting electric circuit that restricts the rotation operation of the rotating body and the expansion and contraction operation of the lifting cylinder. By providing the relay 81, when the casing tube 15 is held by both the main chuck 19 and the sub chuck 22, the casing tube rotating hydraulic motor 21 is operated to rotate the casing tube 15, or the lifting cylinder 12. Therefore, the operation of moving the casing tube 15 up and down can be regulated, so that it is possible to avoid the occurrence of a large load on each chuck portion, and particularly to prevent the sub chuck 22 from being damaged.

  In addition, solenoid valves 44 and 45 are added to the sub chuck opening side pilot path 33a and the main chuck opening side pilot path 35a, and an electric circuit including simple opening switches 75 and 76 may be added. It is not necessary to change the circuit or the electric circuit significantly, and it can be easily applied to the current tubing apparatus.

  FIG. 3 shows a second embodiment of the present invention. In this embodiment, the remote controller 70 shown in the first embodiment is divided into a main remote controller 701 and a chuck opening remote controller 702, and the main remote controller 701 is divided. And the chuck opening remote controller 702 are connected to each other by a detachable remote controller connection cable 70c. In the following description, the same components as those of the tubing device shown in the first embodiment are designated by the same reference numerals, and detailed description thereof is omitted.

  The main remote controller 701 includes switches necessary for normal work including automatic gripping, that is, a main / sub switch 71 for operating the chuck control valve 52, a main grip change start switch 72, and a lift control valve 53. An up / down changeover switch 73 to be operated and a rotation direction changeover switch 74 to operate the rotation control valve 54 are incorporated, and an operation restriction relay 81 which is an operation restriction electric circuit is incorporated.

  Further, the chuck opening remote controller 702 includes a sub chuck opening switch 75 for controlling energization to the solenoid 44a of the sub chuck opening side pilot solenoid valve 44, and the main chuck as switches used for manual gripping. A main chuck opening switch 76 for controlling energization to the solenoid of the opening side pilot solenoid valve 45 is incorporated, and a main chuck holding confirmation lamp 77 and a main chuck which are turned on when the main chuck side hydraulic switch 39 is turned on. A main chuck gripping relay 78 that turns on the grip switch portion 78a, a sub chuck grip confirmation lamp 79 that lights when the sub chuck side hydraulic switch 43 is turned on, and a sub chuck grip switch portion 80a that turns on. A chuck gripping the relay 80 is incorporated.

  In this way, the main remote controller 701 used in normal work and the chuck open remote controller 702 used for manual gripping are divided to reduce the size and weight of the main remote controller 701 used in normal work. Therefore, operability can be improved. Further, when the casing tube is extremely heavy, the chuck tube remote controller 702 is connected and used as necessary, so that the casing tube 15 may slip off when the grip is changed as in the first embodiment. The occurrence of such accidents can be prevented.

  In addition, since the grip confirmation lamps 77 and 79 are provided, the state of each chuck 19 and 22 can be easily and reliably confirmed. Furthermore, the chuck opening remote controller 702 is provided with chuck gripping relays 78 and 80 that operate simultaneously with the lighting of the grip confirmation lamps 77 and 79, and the main remote controller 701 is provided with an operation restriction relay 81 that is operated by the chuck gripping relays 78 and 80. Therefore, when the casing tube 15 is gripped by both chucks 19 and 22, the operation of rotating or raising / lowering the casing tube 15 can be restricted.

  FIG. 4 shows a third embodiment of the present invention. In this embodiment, the remote controller 70 shown in the first embodiment is divided into a main remote controller 703 and a chuck opening remote controller 704, and the main remote controller 703 is divided. And the chuck opening remote controller 704 are connected by a detachable remote control connection cable 70d for use.

  In the present embodiment, the main remote controller 703 has a main / sub switch 71, a main grip change start switch 72, and a lift switch without providing the grip confirmation lamps 77 and 79, the chuck grip relays 78 and 80, and the operation restriction relay 81. A switch 73 and a rotation direction changeover switch 74 are provided, and the chuck opening remote controller 704 is provided with only the sub chuck opening switch 75 and the main chuck opening switch 76.

  In the case of this embodiment, when switching from the main chuck 19 to the sub chuck 22 after the grip change operation is started, the hydraulic pump 51 is gripped by the chuck control valve 52, the sub chuck closing side circuit 57, the hydraulic hose 10b, and the sub chuck cylinder. When switching from the sub-chuck 22 to the main chuck 19 at any position in the hydraulic path through the circuit 32 to the closing side of the sub-chuck cylinder 23, the hydraulic pump 51 controls the chuck control valve 52, the main chuck closing side. After confirming the pressure at any position in the hydraulic path from the circuit 58, the hydraulic hose 10a, and the main chuck cylinder gripping circuit 31 to the closing side of the sub chuck 22, the sub chuck opening switch 75 or the main chuck opening switch 76 is checked. Can be turned off.

  Thus, by forming, it is possible to further simplify the configuration of the remote controller and the like without impairing the basic fall prevention function of the casing tube 15, and to change the hydraulic circuit and electric circuit of the tubing device main body 10 Addition can be minimized, and modification of the current product can be easily performed.

  DESCRIPTION OF SYMBOLS 10 ... Tubing apparatus main body part, 10a, 10b, 10c ... Hydraulic hose, 11 ... Base frame, 12 ... Elevating cylinder, 13 ... Drive frame, 14 ... Chuck frame, 15 ... Casing tube, 16 ... Insertion hole, 17 ... Bearing, DESCRIPTION OF SYMBOLS 18 ... Rotating body, 19 ... Main chuck, 20 ... Main chuck cylinder, 21 ... Hydraulic motor for casing tube rotation, 22 ... Sub chuck, 23 ... Sub chuck cylinder, 31 ... Main chuck cylinder holding circuit, 32 ... Sub chuck cylinder holding Circuit: 33 ... Sub chuck opening side sequence valve, 33a ... Sub chuck opening side pilot path, 33b ... Check valve, 34 ... Sub chuck cylinder opening circuit, 35 ... Main chuck opening side sequence valve, 35a ... Main chuck opening side pilot 36 ... Main chuck cylinder opening circuit, 37 ... Pilot operation double check valve, 38 ... Main chuck side accumulator, 39 ... Main chuck side hydraulic switch, 40 ... Stop valve, 41 ... Pilot check valve, 42 ... Sub chuck side Accumulator, 43 ... Sub chuck side hydraulic switch, 44 ... Sub chuck opening side pilot solenoid valve, 44a ... Solenoid, 45 ... Main chuck opening side pilot solenoid valve, 45a ... Solenoid, 46 ... Remote control connection terminal, 47 ... Drain circuit, 50 ... Hydraulic unit, 51 ... Hydraulic pump, 52 ... Chuck control valve, 52a ... Sub chuck closing side solenoid, 52b ... Main chuck closing side solenoid, 53 ... Elevating control valve, 54 ... Diversion control valve, 55 ... Relief valve, 56 ... Tank, 57 ... Sub chuck closing side circuit, 58 ... Main chuck closing side circuit, 70 ... Remote control, 701, 703 ... Main remote control, 702, 704 ... Chuck opening remote control, 70a ... Hydraulic unit side connection cable, 70b ... Main body side connection cable, 70c, 70d ... Remote control connection cable, 71 ... Main / sub changeover switch, 71a ... Sub chuck closing side (main chuck opening side) contact, 71b ... Main chuck closing side ( Sub chuck opening side) Contact point, 72 ... Main grip change start switch, 73 ... Elevation switching switch, 74 ... Rotation direction switch, 75 ... Sub chuck opening switch, 76 ... Main chuck opening switch, 77 ... Main chuck grip confirmation lamp, 78 ... Main chuck gripping Relay, 78a ... Main chuck grip switch part, 79 ... Sub chuck grip confirmation lamp, 80 ... Sub chuck grip relay, 80a ... Sub chuck grip switch part, 81 ... Operation restriction relay, 81a ... Operation restriction switch part, 91 ... Power supply

Claims (3)

  A rotating body that is moved up and down by an elevating cylinder is provided above a base frame installed on the ground, a main chuck is provided on the rotating body, a sub chuck is provided on the base frame, and either the main chuck or the sub chuck is a casing. A tubing apparatus comprising: a hydraulic circuit for gripping a tube; an electric circuit for operating the hydraulic circuit; and the remote control for operating the hydraulic circuit and the electric circuit, wherein the hydraulic circuit includes a hydraulic pump The main chuck cylinder gripping circuit that operates the main chuck cylinder in the direction in which the main chuck grips the casing tube and the sub chuck cylinder gripping that operates the sub chuck cylinder in the direction in which the sub chuck grips the casing tube Circuit and A chuck control valve for switching to any one of the above and a sub chuck cylinder that branches from the main chuck cylinder gripping circuit via a sub chuck opening side sequence valve and operates the sub chuck cylinder in a direction in which the sub chuck opens the casing tube. An opening circuit, and a main chuck cylinder opening circuit that branches from the sub chuck cylinder gripping circuit via a main chuck opening side sequence valve and operates the main chuck cylinder in a direction in which the main chuck opens the casing tube, A sub chuck opening side pilot solenoid valve is provided in the sub chuck opening side pilot path for transmitting the pressure of the main chuck cylinder gripping circuit to the sub chuck opening side sequence valve. The chuck opening side pilot solenoid valve is in a state where the pressure of the main chuck cylinder gripping circuit can be transmitted to the sub chuck opening side sequence valve when the sub side solenoid provided in the sub chuck opening side pilot solenoid valve is not energized. When the sub-side solenoid is energized, the pressure of the main chuck cylinder gripping circuit is blocked from being transmitted to the sub-chuck opening side sequence valve, and the main chuck opening side sequence valve is connected to the sub chuck cylinder gripping circuit. A main chuck opening side pilot solenoid valve is provided in the main chuck opening side pilot path for transmitting pressure, and the main chuck opening side pilot solenoid valve is connected to the main chuck opening side pilot solenoid valve. When the main side solenoid provided in the valve is in a non-energized state, the pressure of the sub chuck cylinder gripping circuit can be transmitted to the main chuck opening side sequence valve. When the main side solenoid is in the energized state, the sub chuck cylinder gripping The state where the pressure of the circuit is transmitted to the main chuck opening side sequence valve is cut off, and the remote control has a connection terminal detachably connected to the remote control connection terminal connected to the sub side solenoid and the main side solenoid. And a sub chuck opening side switch for turning on and off the energization state of the sub side solenoid, and a main chuck opening side switch for turning on and off the energization state of the main side solenoid, the sub chuck opening side switch and the main chuck Open side Pitch is tubing apparatus characterized by ON position to the sub-side solenoid and the main side solenoid energized state is set to a steady state.   The main chuck cylinder gripping circuit is provided with a main chuck side hydraulic switch that is energized when the pressure of the main chuck cylinder gripping circuit rises to a preset main chuck gripping pressure. A sub chuck-side hydraulic switch that is energized when the pressure of the sub-chuck cylinder gripping circuit rises to a preset sub-chuck gripping pressure is provided, and the main chuck-side hydraulic switch is energized in the remote controller. 2. The tubing device according to claim 1, further comprising: a main chuck grip indicator lamp that lights when the sub chuck side hydraulic switch is energized, and a sub chuck grip indicator lamp that lights when the sub chuck side hydraulic switch is energized. .   The remote control includes an operation regulating electric circuit that regulates the rotation operation of the rotating body and the expansion / contraction operation of the lifting cylinder when both the main chuck side hydraulic switch and the sub chuck side hydraulic switch are energized. The tubing device according to claim 2, wherein:

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