JP2014173383A - Tubing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tubing device including a hydraulic circuit and an electric circuit for preventing gripping force from decreasing when a casing tube is re-gripped.SOLUTION: A tubing device comprises: a main chuck-side hydraulic switch 44 which allows hydraulic oil to flow from a main-chuck cylinder grip circuit to a sub-chuck cylinder opening circuit 35 by electrically opening a sub-chuck opening-side sequence valve 34 when a main-chuck cylinder grip circuit 32 rises in pressure to reach gripping pressure; and a sub-chuck-side hydraulic switch 45 which allows the hydraulic oil to flow from a sub-chuck cylinder grip circuit to a main-chuck cylinder opening circuit 37 by electrically opening a sub-chuck opening-side sequence valve 36 when a sub-chuck cylinder grip circuit 33 rises in pressure to reach the gripping pressure.

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 or 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 pressure at which each chuck cylinder grips each chuck, the casing tube from the main chuck to the sub chuck or from the sub chuck to the main chuck. When gripping is carried out, the gripping force of the casing tube temporarily decreases. For this reason, when the weight of the casing tube is extremely heavy, the casing tube may slide down when the gripping force is reduced.

  Accordingly, an object of the present invention is to provide a tubing device including a hydraulic circuit and an electric circuit for preventing a decrease in gripping force when gripping a casing tube.

  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 tubing circuit comprising a hydraulic circuit for holding one of the main chuck and the sub-chuck in a state where the casing tube is gripped, and an electric circuit for operating the hydraulic circuit. 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 a sub chuck cylinder gripping circuit that operates the sub chuck cylinder in the direction in which the sub chuck grips the casing tube. Noisy A chuck control valve for switching between them 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, When the electric circuit detects that the pressure of the main chuck cylinder gripping circuit has risen to a preset main gripping pressure, it electrically opens the sub-chuck opening side sequence valve and opens the main chuck. A main chuck-side hydraulic switch that allows the flow of hydraulic oil from the cylinder gripping circuit to the sub-chuck cylinder opening circuit, and the main chuck when detecting that the pressure of the sub-chuck cylinder gripping circuit has risen above the sub-chuck gripping pressure. And a sub chuck side hydraulic switch that electrically opens the chuck opening side sequence valve and allows the flow of hydraulic oil from the sub chuck cylinder gripping circuit to the main chuck cylinder opening circuit.

  Further, the tubing device according to the present invention includes an electric circuit for a main chuck indicator lamp that lights a main chuck grip indicator lamp when the pressure detected by the main chuck hydraulic switch is equal to or higher than the main chuck grip pressure. A sub-chuck indicator lamp electric circuit for lighting a sub-chuck grip indicator lamp when the pressure detected by the sub-chuck side hydraulic switch is equal to or higher than the sub-chuck grip pressure, and the main chuck side hydraulic pressure When the pressure detected by the switch is equal to or higher than the main chuck gripping pressure and the pressure detected by the sub-chuck side hydraulic switch is equal to or higher than the sub-chuck gripping pressure, the operation of the lift cylinder and the hydraulic motor are restricted. It is characterized in that it is equipped with an electric circuit that regulates the lifting / rotating operation.

  According to the tubing device of the present invention, when the grip of the casing tube is switched from the main chuck to the sub chuck, or when the sub chuck is switched to the main chuck, the cylinder pressure of the grip side (close side) chuck is changed to the grip pressure. Since the cylinder of the chuck on the open side (open side) becomes operable after being raised, the casing tube can be securely held by the main chuck or the sub chuck. As a result, when the casing tube is gripped, the casing tube can be prevented from slipping down due to a decrease in the cylinder pressure.

  Further, by turning on the indicator lamp when the cylinder pressure of the closing chuck becomes the gripping pressure, it can be confirmed that the casing tube is securely gripped by the main chuck or the sub chuck. Furthermore, when the casing tube is gripped by both the main chuck and the sub chuck, it is possible to avoid the occurrence of a large load on each part by restricting the raising / lowering operation and rotation operation of the casing tube. Can be reliably prevented from being damaged.

It is a circuit diagram which shows one example of the hydraulic circuit and electric circuit which were provided in the tubing apparatus of this invention.

  The tubing device shown in the present embodiment includes a tubing device main body 10, a hydraulic unit 51 and a connection cable 10d connected to the tubing device main body 10 via three hydraulic hoses 10a, 10b, and 10c for chucking. And a hydraulic unit 50 provided with an electric circuit unit 61 for transmitting and receiving various electric signals through the. 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 gripped by approaching each other on the inner periphery of each rotating body. A wedge-shaped main chuck 19 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 to hold the main chuck 19 (closed state). Or a main chuck cylinder 20 is provided for separating the drive frame 13 and the chuck frame 14 to open the main chuck 19 (opened 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 31 of the tubing device main body 10 that operates the main chuck cylinder 20 and the sub chuck cylinder 23 is configured so that the main chuck 19 is driven by hydraulic oil having a predetermined pressure supplied from the hydraulic unit 51 via a hydraulic hose 10a. The main chuck cylinder gripping circuit 32 that operates the main chuck cylinder 20 in the direction of gripping the casing tube 15 and the hydraulic oil at a predetermined pressure supplied from the hydraulic unit 51 via the hydraulic hose 10b causes the sub chuck 22 to be casing. A sub chuck cylinder gripping circuit 33 for operating the sub chuck cylinder 23 in the direction of gripping the tube 15, and a branch from the main chuck cylinder gripping circuit 32 via a sub chuck opening side sequence valve 34, and the sub chuck 2 Branches from the sub-chuck cylinder opening circuit 35 for operating the sub-chuck cylinder 23 in the direction of opening the casing tube 15 and the sub-chuck cylinder gripping circuit 33 via the main chuck opening side sequence valve 36, and the main chuck 19 Includes a main chuck cylinder opening circuit 37 that operates the main chuck cylinder 20 in a direction to open the casing tube 15.

  A pilot operation double check valve 38 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 32 and the main chuck cylinder opening circuit 37, and the pilot operation double check Between the valve 38 and the main chuck cylinder 20, a main chuck side accumulator 39 for holding the gripping pressure in the main chuck 19 is provided.

  The sub chuck cylinder gripping circuit 33 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 pressure in the gripping state of the sub chuck 22 is provided.

  Further, each of the sub chuck opening side sequence valve 34 and the main chuck opening side sequence valve 36 is provided with a drain path 43 for returning the drain to the hydraulic unit 51 via the hydraulic hose 10c.

  Further, in the main chuck cylinder gripping circuit 32, the hydraulic oil pressure between the pilot operation double check valve 38 and the main chuck cylinder 20 in the main chuck cylinder gripping circuit 32 has risen above a preset main chuck gripping pressure. A main chuck-side hydraulic switch 44 that is sometimes turned on is provided, and the sub chuck cylinder gripping circuit 33 has a hydraulic oil pressure between the pilot check valve 41 and the sub chuck cylinder 23 in the sub chuck cylinder gripping circuit 33. Is provided with a sub chuck-side hydraulic switch 45 that is turned on when the pressure rises above a preset sub chuck gripping pressure.

  The hydraulic unit 51 includes a spring center type three-position double solenoid valve that switches the flow direction of the hydraulic fluid boosted by the hydraulic pump 52 to either the main chuck cylinder gripping circuit 32 or the sub chuck cylinder gripping circuit 33. A chuck control valve 53, a lift control valve 54 for extending and retracting the lift cylinder 12, a rotation control valve 55 for rotating the casing tube rotating hydraulic motor 21, and a predetermined position. And a relief valve 56.

  The electrical circuit unit 61 for electrically controlling the hydraulic circuit configured as described above includes a main chuck side relay circuit unit 62 connected to the main chuck side hydraulic switch 44 via the connection cable 10d and the sub chuck side. Sub-chuck side relay circuit part 63 connected to the hydraulic switch 45, main chuck side relay circuit part 62 and sub-chuck side relay circuit part 63 are operated according to the ON / OFF state of the main chuck side relay circuit part 63; A remote controller 65 for opening and closing the chuck 19 and the sub chuck 22 is provided.

  The remote controller 65 is provided with a grip change switch 66 and a grip change switch 67, a main chuck grip indicator lamp 68 and a sub chuck grip indicator lamp 69. Although not shown in the figure, a lifting switch for operating the lifting control valve 54 and a rotating switch for operating the rotation control valve 55 are separately provided. The solenoids of the control valves 54 and 55 are connected to the control valves 54 and 55 via the regulation relay circuit section 64, respectively.

  When the casing tube 15 is pulled out from the ground, the elevating cylinder 12 is shortened and the casing tube 15 is gripped by the main chuck 19, and the elevating cylinder 12 is extended while the casing tube rotating hydraulic motor 21 is operated. Pull 15 out of the ground while rotating 15. 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 then the holding of the casing tube 15 is switched from the main chuck 19 to the sub chuck 22. The operation of the remote controller 65 at this time and the flow of current in the electric circuit and the flow of hydraulic oil in the hydraulic circuit will be described below.

  First, the grip changing switch 66 is switched to the sub chuck closing side (main chuck opening side) contacts 66a, 66b. As a result, the current flowing from the power supply 70 to the power supply circuit 71 flows through the remote control connection line 72 and the electric circuits 73e and 73g, passes through one of the sub-chuck closing side contacts 66a of the grip changeover switch 66, and further passes through the remote control 65. It flows to the sub chuck closing side solenoid 53a of the chuck control valve 53 through the sub chuck closing side electric circuit 73a, the remote control connection line 72, the sub chuck closing side electric circuit 73b in the electric circuit section 61, and the chuck control valve 53 The spool is moved to the left side sub chuck closing side in FIG. At this time, the tip of the other sub-chuck closing side contact 66b of the grip switching switch 66 is connected to the grip switching switch 67. However, even if the grip switching switch 67 is pushed by mistake, the main chuck side relay circuit section is connected. Since all the contacts in 62 are OFF, no current flows through the main chuck opening side contact 62b.

  When the spool of the chuck control valve 53 moves to the sub chuck closing side, the hydraulic oil boosted by the hydraulic pump 52 passes through the hydraulic hose 10b from the chuck control valve 53 via the sub chuck closing side circuit 57, and the tubing device. It is supplied to the sub chuck cylinder gripping circuit 33 of the main body 10.

  The hydraulic oil flowing through the sub chuck cylinder gripping circuit 33 does not flow in the direction of the check valve 36V because the check valve 36V of the main chuck opening side sequence valve 36 is closed, and the stop valve 40 and the pilot check valve 41 are not supplied. Then, it is supplied to the closing side 23 a of the sub chuck cylinder 23.

  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, hydraulic oil in the cylinder is pushed out from the opening side 23b of the sub chuck cylinder 23 to the sub chuck cylinder opening circuit 35, passes through the check valve 34V of the sub chuck opening side sequence valve 34, and the main chuck cylinder gripping circuit. 32, return to the tank through the hydraulic hose 10a, the main chuck closing side circuit 58, the chuck control valve 53 and the return circuit 59.

  Then, when the pressure in the sub chuck cylinder gripping circuit 33 rises above the preset sub chuck gripping pressure and the sub chuck 22 securely grips the casing tube 15, the sub chuck side hydraulic switch 45 is turned on. Then, a current flows through the sub chuck side electric circuit 74a, and a current from the power supply circuit 71 flows into the sub chuck side electric circuit 74b of the electric circuit section 61 via the connection cable 10d.

  As a result, the relay 62a of the main chuck side relay circuit unit 62 is activated, the contacts of the main chuck side relay circuit unit 62 are switched, and the main chuck opening contact 62b is turned ON. At this time, when the grip change switch 67 is pressed, the main chuck opening contact 62b passes from the sub chuck closing contact 66b of the grip change switch 66 via the grip change switch 67, the electric circuit 73h, the remote control connection line 72, and the electric circuit 73o. The current flows to the main chuck opening side electric circuit 75b via the main chuck opening side electric circuit 75a and the connection cable 10d, and the solenoid 36a of the main chuck opening side sequence valve 36 is operated.

  The operation of the solenoid 36a causes the spool of the main chuck opening side sequence valve 36 to move upward in FIG. 1, and the pressure in the sub chuck cylinder gripping circuit 33 is transmitted to the pilot side of the check valve 36V, thereby opening the check valve 36V. It becomes a state. When the check valve 36V is opened, the hydraulic oil in the sub chuck cylinder gripping circuit 33 flows to the main chuck cylinder opening circuit 37 through the check valve 36V, and passes through the opening side 38a of the pilot operation double check valve 38 to the main chuck cylinder. 20 to the open side 20a. At this time, the hydraulic oil in the sub chuck cylinder gripping circuit 33 flows into the main chuck cylinder opening circuit 37, whereby the pressure on the upstream side (pump 52 side) from the pilot check valve 41 is reduced. Therefore, the hydraulic oil does not flow out from the closing side 23a of the sub chuck cylinder 23, and the closing side 23a of the sub chuck cylinder 23 is adjusted to the sub chuck gripping pressure by the action of the sub chuck side accumulator 42. Retained.

  When the hydraulic oil is supplied from the sub chuck cylinder gripping circuit 33 to the main chuck cylinder opening circuit 37, the closing side 38b of the pilot operation double check valve 38 is opened by the increase in the pressure of the main chuck cylinder opening circuit 37. The hydraulic fluid is supplied from the opening circuit 37 to the opening side 20a of the main chuck cylinder 20, and from the closing side 20b of the main chuck cylinder 20, the hydraulic fluid is pushed out to the main chuck cylinder gripping circuit 32, and the pilot operation double check valve. 38, the hydraulic oil hose 10a, the main chuck closing circuit 58, the chuck control valve 53, and the return circuit 59 are returned to the tank together with the hydraulic oil in the main chuck accumulator 39. As a result, the drive frame 13 and the chuck frame 14 are separated from each other, and the main chuck 19 is opened.

  Further, by the operation of the relay 62a, the lighting contact 62c of the sub chuck indicator lamp electric circuit 76a of the main chuck side relay circuit section 62 is turned ON, and a current flows to the sub chuck indicator lamp electric circuit 76b of the remote controller 65, thereby causing the sub chuck. When the grip indicator lamp 69 is turned on, it can be confirmed that the sub chuck 22 is securely gripping the casing tube 15.

  After the main chuck 19 is in the open state, when the grip changeover switch 66 is turned OFF, the current to the sub chuck closing side solenoid 53a is cut off, and the spool of the chuck control valve 53 returns to the center by the action of the spring. Then, the supply of the hydraulic oil to the sub chuck closing side circuit 57 is completed.

  At this time, the hydraulic oil supplied to the closing side 23a of the sub chuck cylinder 23 is held on the closing side 23a by the pilot check valve 41 in the closed state, and is also held at a predetermined pressure by the sub chuck side accumulator 42. No. 22 continues the state in which the casing tube 15 is gripped with a predetermined gripping force. Further, since the pilot operation double check valve 38 is closed, the main chuck cylinder 20 holds the main chuck 19 in an opened state by restricting the flow of hydraulic oil.

  Furthermore, even if the grip change switch 67 is turned on before the sub chuck grip indicator lamp 69 is turned on after the sub chuck side hydraulic switch 45 is turned ON, the contact 62b of the main chuck side relay circuit section 62 is open, Since power is not supplied to the solenoid 36a of the main chuck opening side sequence valve 36 and the check valve 36V is closed, no hydraulic oil is supplied to the opening side 20a of the main chuck cylinder 20, and the pilot operation double check valve 38 is closed, the main chuck 19 is not opened, and the gripping state of the casing tube 15 by the main chuck 19 is maintained. Therefore, before the sub chuck 22 is in a predetermined gripping state, the main chuck 19 is closed. May open and the casing tube 15 may slide down. No.

  After the sub chuck 22 grips the casing tube 15 and the elevating cylinder 12 is shortened while the main chuck 19 is open, the grip of the casing tube 15 is switched from the sub chuck 22 to the main chuck 19. Switching from the sub chuck 22 to the main chuck 19 switches the grip change switch 66 to the main chuck closing side (sub chuck opening side) contacts 66c and 66d.

  As a result, the current flowing from the power supply 70 to the power supply circuit 71 flows through the remote control connection line 72 and the power supply circuits 73e and 73g of the remote control 65, passes through one main chuck closing side 66c of the grip changeover switch 66, and further the remote control 65 The main chuck closing side electric circuit 73c, the remote control connection line 72, and the sub chuck closing side electric circuit 73d in the electric circuit section 61 flow to the main chuck closing side solenoid 53b of the chuck control valve 53, and the chuck control valve. 53 spools move to the main chuck closing side on the right side in FIG.

  At this time, the tip of the other sub chuck closing side contact 66d of the grip changing switch 66 is connected to the grip changing switch 67, but all the contacts in the sub chuck side relay circuit section 63 are OFF. Therefore, even if the misplacement switch 67 is pressed by mistake, no current flows through the sub chuck release contact 63b.

  When the spool moves to the main chuck closing side, the hydraulic fluid boosted by the hydraulic pump 52 passes from the chuck control valve 53 through the main chuck closing side circuit 58, the hydraulic hose 10a, and the main chuck of the tubing device main body 10. It is supplied to the cylinder gripping circuit 32.

  The hydraulic fluid flowing through the main chuck cylinder gripping circuit 32 does not flow in the direction of the check valve 34V because the check valve 34V of the sub chuck opening side sequence valve 34 is closed, and the pilot operation double check valve 38 is closed. 38 b is supplied to the closing side 20 b of the main chuck cylinder 20. Further, since the opening side 38a of the pilot operation double check valve 38 is opened by the pressure increase in the main chuck cylinder gripping circuit 32, the opening side 20a of the main chuck cylinder 20 is supplied from the opening side 20a of the main chuck cylinder 20 with the supply of hydraulic oil to the closing side 20b. The hydraulic oil in the cylinder is pushed out to the main chuck cylinder opening circuit 37. Accordingly, the drive frame 13 and the chuck frame 14 come close to each other by the action of the main chuck cylinder 20 to close the main chuck 19 and grip the casing tube 15. At the same time, the hydraulic oil flows into the main chuck side accumulator 39, whereby the closing side 20b of the main chuck cylinder 20 is held at a predetermined pressure.

  The hydraulic fluid that has passed through the open side 38a of the pilot operation double check valve 38 passes through the check valve 36V of the main chuck open side sequence valve 36, and includes the sub chuck cylinder gripping circuit 33, the hydraulic hose 10b, the sub chuck closing side circuit 57, It returns to the tank through the chuck control valve 53 and the return circuit 59.

  When the pressure in the main chuck cylinder gripping circuit 32 rises above a preset main chuck gripping pressure and the main chuck 19 grips the casing tube 15 securely, the main chuck side hydraulic switch 44 is turned on. Then, a current flows through the main chuck side electric circuit 74c, and a current from the power supply circuit 71 flows into the main chuck side electric circuit 74d of the electric circuit section 61 via the connection cable 10d.

  As a result, the relay 63a of the sub-chuck side relay circuit unit 63 is activated, the respective contacts of the sub-chuck side relay circuit unit 63 are switched, and the sub-chuck release contact 63b is turned on. At this time, the grip change switch 67 is pushed. Then, the main chuck opening contact 63b, the sub chuck opening side electric circuit 75c, via the sub chuck closing contact 66d of the grip changing switch 66, via the holding switch 67, the electric circuit 73m, the remote control connection line 72, and the electric circuit 73n, A current flows to the sub chuck opening side electric circuit 75d via the connection cable 10d, and the solenoid 34a of the sub chuck opening side sequence valve 34 is operated. The operation of the solenoid 34a causes the spool of the sub chuck opening side sequence valve 34 to move downward in FIG. 1, and the pressure in the main chuck cylinder gripping circuit 32 is transmitted to the pilot side of the check valve 34V, thereby opening the check valve 34V. It becomes a state.

  When the check valve 34V is opened, the hydraulic oil in the main chuck cylinder gripping circuit 32 flows through the check valve 34V to the sub-chuck cylinder opening circuit 35 and is supplied to the opening side 23b of the sub-chuck cylinder 23. Since the pilot check valve 41 is opened by the pressure increase in the cylinder opening circuit 35, the hydraulic oil is pushed out from the closing side 23 a of the sub chuck cylinder 23. As a result, the sub chuck 22 is opened to open the casing tube 15.

  When the hydraulic oil in the main chuck cylinder gripping circuit 32 flows into the sub chuck cylinder opening circuit 35, the pressure in the main chuck cylinder gripping circuit 32 decreases, but the pilot operation double check valve 38 is automatically closed. Therefore, the hydraulic oil supplied to the closing side 20b of the main chuck cylinder 20 does not flow out, and the closing side 20b of the main chuck cylinder 20 is held at the main chuck gripping pressure by the action of the main chuck side accumulator 39, The gripping state of the casing tube 15 by the main chuck 19 is not loosened.

  The hydraulic oil pushed out from the closing side 23a of the sub chuck cylinder 23 together with the hydraulic oil from the sub chuck side accumulator 42, the pilot check valve 41, the stop valve 40, the sub chuck cylinder gripping circuit 33, the hydraulic hose 10b, the sub chuck closing. It returns to the tank through the side circuit 57, the chuck control valve 53 and the return circuit 59.

  Further, by the operation of the relay 63a, the lighting contact 63c of the main chuck indicator lamp electric circuit 76c of the sub chuck side relay circuit section 63 is turned ON, and a current flows to the main chuck indicator lamp electric circuit 76d of the remote controller 65, thereby causing the main chuck. The grip display lamp 68 is turned on to display that the main chuck 19 is securely gripping the casing tube 15.

  After the sub chuck 22 is in the open state, when the grip changeover switch 66 is turned OFF, the current to the main chuck closing solenoid 53b is cut off, and the chuck control valve 53 is returned to the center by the action of the spring. Supply of the hydraulic oil to the chuck closing side circuit 58 is completed. At this time, the hydraulic fluid supplied to the closing side 20b of the main chuck cylinder 20 is held on the closing side 20b by closing both the opening side 38a and the closing side 38b of the pilot operation double check valve 38, and the main chuck side The accumulator 39 holds the pressure at a predetermined pressure, and the main chuck 19 continues to hold the casing tube 15 with a predetermined gripping force. Further, the sub chuck cylinder 23 is in an open state until hydraulic oil is supplied to the sub chuck cylinder gripping circuit 33.

  Also in this case, even if the grip change switch 67 is turned on after the main chuck side hydraulic switch 44 is turned on and before the main chuck grip indicator light 68 is turned on, power is supplied to the solenoid 34a of the sub chuck opening side sequence valve 34. Since the check valve 34V is closed, the hydraulic oil is not supplied to the open side 23b of the sub chuck cylinder 23, the sub chuck 22 is not opened, and the gripping state of the casing tube 15 by the sub chuck 22 is maintained. Therefore, the sub chuck 22 does not open and the casing tube 15 does not slide down before the main chuck 19 enters a predetermined gripping state.

  Therefore, when the grip of the casing tube 15 is switched from the main chuck 19 to the sub chuck 22 or from the sub chuck 22 to the main chuck 19, the main chuck 19 or the sub chuck 22 always holds the casing tube 15 with a predetermined gripping force. Since it is in the gripped state, the casing tube 15 can be reliably prevented from sliding off.

  Then, for some reason such as a failure of the valve, for example, when the sub chuck 22 is gripping the casing tube 15, the stop valve 40 is closed and the casing tube 15 is moved to the sub chuck 22 without forgetting to open the stop valve 40. When switching from the main chuck 19 to the main chuck 19, both the main chuck 19 and the sub chuck 22 are closed. In this case, since the pressures of the main chuck cylinder gripping circuit 32 and the sub chuck cylinder gripping circuit 33 are higher than a predetermined pressure, both the main chuck side hydraulic switch 44 and the sub chuck side hydraulic switch 45 are both ON. Thus, both the relay 62a of the main chuck side relay circuit unit 62 and the relay 63a of the sub chuck side relay circuit unit 63 operate. As a result, the operation restricting contact 62d of the main chuck side relay circuit section 62 and the operation restricting contact 63d of the sub chuck side relay circuit section 63 are both energized, and current is supplied to the relay 64a of the elevating / rotating operation restricting relay circuit section 64. The relay 64a is actuated.

  Thereby, all the contacts in the lifting / rotation operation restriction relay circuit unit 64 are turned off. Therefore, all the circuits for supplying current to the solenoids of the lift control valve 54 and the rotation control valve 55 are cut off. Even if the lift switch and the rotation switch are operated, the lift control valve 54 and the rotation The control valve 55 does not operate, and when the casing tube 15 is gripped by both the main chuck 19 and the sub chuck 22, the casing tube rotating hydraulic motor 21 is rotated, and the elevating cylinder 12 is expanded and contracted. Can be regulated. Thereby, it can avoid that a big load generate | occur | produces in each chuck | zipper part, and can prevent especially that the sub chuck | zipper 22 is damaged.

  In addition, the configuration of the tubing device main body and the hydraulic unit can be adopted as appropriate according to conditions such as the diameter of the casing tube to be constructed, and the configuration of the remote control is integrated with the tubing device main body and the hydraulic unit. It can also be made. Also, the set pressure of the hydraulic switch is arbitrary, and the set pressure can be set to different values on the main side and the sub side.

  DESCRIPTION OF SYMBOLS 10 ... Tubing apparatus main body part, 10a, 10b, 10c ... Hydraulic hose, 10d ... Connection cable, 11 ... Base frame, 12 ... Lifting cylinder, 13 ... Drive frame, 14 ... Chuck frame, 15 ... Casing tube, 16 ... Insertion hole , 17 ... Bearing, 18 ... Rotating body, 19 ... Main chuck, 20 ... Main chuck cylinder, 20a ... Open side, 20b ... Close side, 21 ... Hydraulic motor for rotating casing tube, 22 ... Sub chuck, 23 ... Sub chuck cylinder , 23a ... Close side, 23b ... Open side, 31 ... Hydraulic circuit, 32 ... Main chuck cylinder gripping circuit, 33 ... Sub chuck cylinder gripping circuit, 34 ... Sub chuck opening side sequence valve, 34a ... Solenoid, 34V ... Check valve, 35 ... Sub chuck cylinder opening circuit 36 ... Main chuck open side sequence valve, 36a ... Solenoid, 36V ... Check valve, 37 ... Main chuck cylinder open circuit, 38 ... Pilot operated double check valve, 38a ... Open side, 38b ... Close side, 39 ... Main chuck side accumulator , 40 ... Stop valve, 41 ... Pilot check valve, 42 ... Sub chuck side accumulator, 43 ... Drain path, 44 ... Main chuck side hydraulic switch, 45 ... Sub chuck side hydraulic switch, 50 ... Hydraulic unit, 51 ... Hydraulic unit section 52 ... Hydraulic pump, 53 ... Chuck control valve, 53a ... Sub-chuck closing solenoid, 53b ... Main chuck closing solenoid, 54 ... Lift control valve, 55 ... Rotation control valve, 56 ... Valve: 57 ... Sub chuck closing side circuit, 58 ... Main chuck closing side circuit, 59 ... Return circuit, 61 ... Electric circuit section, 62 ... Main chuck side relay circuit section, 62a ... Relay, 62b ... Main chuck opening contact, 62c ... lighting contact, 62d ... operation regulating contact, 63 ... sub chuck side relay circuit section, 63a ... relay, 63b ... sub chuck opening contact, 63c ... lighting contact, 63d ... operation regulating contact, 64 ... lift / rotation operation regulating relay circuit 64a ... relay, 65 ... remote control, 66 ... grip change switch, 66a, 66b ... sub chuck closing side contact, 66c, 66d ... main chuck closing side contact, 67 ... grip change switch, 68 ... main chuck grip indicator lamp 69 ... Sub chuck grip indicator light, 70 ... Power supply, 71 ... Power supply circuit, 72 ... Remote control connection line, 73a, 73b ... sub chuck closing side electric circuit, 73c, 73d ... main chuck closing side electric circuit, 74a, 74b ... sub chuck side electric circuit, 74c, 74d ... main chuck side electric circuit, 75a, 75b ... main chuck opening side Electric circuit, 75c, 75d ... Sub chuck opening side electric circuit, 76a, 76b ... Sub chuck indicator lamp electric circuit, 76c, 76d ... Main chuck indicator lamp electric circuit

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. In a tubing device comprising a hydraulic circuit for gripping a tube and an electric circuit for operating the hydraulic circuit, the hydraulic circuit is configured to grip hydraulic oil from a hydraulic pump in a direction in which the main chuck grips a casing tube. A chuck control valve that switches between a main chuck cylinder gripping circuit that operates the main chuck cylinder and a sub chuck cylinder gripping circuit that operates the sub chuck cylinder in a direction in which the sub chuck grips the casing tube; Branching from the main chuck cylinder gripping circuit via the sub chuck opening side sequence valve, and operating the sub chuck cylinder in a direction in which the sub chuck opens the casing tube, and from the sub chuck cylinder gripping circuit A main chuck cylinder opening circuit that branches 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, and the electric circuit includes the main chuck cylinder gripping circuit. When it is detected that the pressure of the main chuck has risen above a preset main chuck gripping pressure, the sub chuck opening side sequence valve is electrically opened and the main chuck cylinder gripping circuit The main chuck side hydraulic switch that allows the flow of hydraulic oil to the open circuit, and the main chuck opening side sequence valve when the pressure of the sub chuck cylinder gripping circuit rises above the sub chuck gripping pressure is electrically And a sub-chuck side hydraulic switch that opens to allow the flow of hydraulic oil from the sub-chuck cylinder gripping circuit to the main chuck cylinder opening circuit.   The electric circuit is detected by an electric circuit for a main chuck indicator lamp that lights a main chuck grip indicator light when a pressure detected by the main chuck side hydraulic switch is equal to or higher than the main chuck grip pressure, and the sub chuck side hydraulic switch detects 2. The tubing device according to claim 1, further comprising a sub-chuck indicator lamp electric circuit that lights a sub-chuck grip indicator lamp when the applied pressure is equal to or higher than the sub-chuck grip pressure.   When the pressure detected by the main chuck side hydraulic switch is equal to or higher than the main chuck holding pressure and the pressure detected by the sub chuck side hydraulic switch is equal to or higher than the sub chuck holding pressure, the electric circuit The tubing device according to claim 1 or 2, further comprising a lifting / rotation operation regulating electric circuit for regulating the operation and the operation of the hydraulic motor.

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