JP2005330655A - Chuck hydraulic circuit for tubing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase the opening speed of a main chuck cylinder when opening a main chuck device. <P>SOLUTION: This chuck hydraulic circuit comprises the main chuck device 10 and a sub chuck device 16. A sub chuck opening operation circuit 28 is connected to a main chuck clamping operation circuit 27 via a first sequence and check valve 29. In a main chuck opening operation circuit 35 to which a sub chuck clamping operation circuit is connected and in which a sequence and check valve 33 is provided, a second direction changing valve 32 is provided for change-over between a circuit which sucks/discharges operating oil via the second sequence and check valve 33 and a circuit which sucks/discharges the operating oil not via the second sequence and check valve 33. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hydraulic circuit for a chuck of a tubing device that pushes and pulls out a casing tube for forming a large-diameter pile in an all-casing method such as civil engineering foundation work.

  The tubing device includes a rotating body provided with a main chuck device that grips the casing tube, a lifting frame that rotatably supports the rotating body, a rotation driving device that is provided on the lifting frame and rotates the rotating body, A base frame erected with an elevating cylinder of the elevating frame, while rotating the casing tube gripped by the main chuck device, the elevating frame is lowered with the elevating cylinder and the casing tube is pushed into the ground, When the casing tube is pushed in for one stroke of the lifting cylinder, the main chuck device is opened, the main chuck device is pulled up, the casing tube is again gripped and the casing tube is rotated, and the lifting frame is lowered by the lifting cylinder.

  In this type of tubing device, in order to prevent the casing tube from sinking under its own weight when the main chuck device is opened, the casing tube is gripped by the sub chuck device when the main chuck device is opened, and the main chuck device holds the casing tube. Some grippers open the casing tube when gripped.

  In the tubing device provided with the sub chuck device, a main chuck device that grips and releases the casing tube by switching operation of the main chuck cylinder, and a sub chuck device that grips and releases the casing tube by switching operation of the sub chuck cylinder, and A hydraulic circuit having a direction switching valve for switching between the main chuck cylinder and the sub chuck cylinder, the main chuck gripping operation circuit extending from the direction switching valve of the hydraulic circuit to the gripping side of the main chuck cylinder, A sub-chuck release operation circuit extending to the open side of the sub-chuck cylinder is connected, and the first chuck that opens the casing tube grip of the sub-chuck device when gripping the casing tube of the main chuck device is connected to the sub-chuck release operation circuit. A sub chuck holding operation circuit extending to the holding side of the sub chuck cylinder is connected to the main chuck opening operating circuit extending from the direction switching valve of the hydraulic circuit to the opening side of the main chuck cylinder. For the chuck in which the main chuck releasing operation circuit is provided with a second sequence and check valve for releasing the casing tube holding of the main chuck device when holding the casing tube of the sub chuck device, and a stop valve is provided in the sub chuck holding operating circuit. Some have a hydraulic circuit.

  This hydraulic circuit opens the sub chuck gripping operation circuit by opening the stop valve when the sub chuck device is opened when the main chuck device is gripped and when the main chuck device is opened when the sub chuck device is gripped. (For example, refer to Patent Document 1).

In the above-described configuration, when the main chuck device and the sub chuck device are used in conjunction with each other, and the stop valve is operated to the stop side in order to switch to the main chuck device single operation, the sub chuck device is opened. If the stop valve is operated to the stop side while the sub chuck device grips the casing tube by mistake, the main chuck device that grips the casing tube will rotate to the sub chuck device via the casing tube. It has been found that there is a possibility of damaging the sub-chuck member due to the rotational force. For this reason, as shown in FIG. 12, the sub chuck opening operation circuit 103 and the sub chuck holding operation circuit 104 are arranged so that the stop valve 102 cannot be operated to the stop side when the sub chuck device 100 holds the casing tube 101. Are connected to a cylinder 107, and a link rod 109 for preventing the operation lever 108 of the stop valve 102 from moving is provided at the rod end of the cylinder 107. It was.
Japanese Utility Model Publication No. 7-54391, pages 1 to 4, FIGS.

  However, in the above-described chuck hydraulic circuit, when the main chuck device is used alone, the main chuck cylinder hydraulic fluid passes through the second sequence and check valve, so that the opening operation itself requires a large pressure. In spite of this, the pressure rises to the second sequence and check valve set pressure, and in the case of pump constant horsepower control, the flow rate is restricted, the opening speed of the main chuck cylinder is slowed, and the construction time becomes long. there were. Further, in order to prevent erroneous operation of the stop valve, it has been necessary to add complicated structures such as a circuit and a cylinder as described above.

  Therefore, according to the present invention, when the main chuck device is opened by itself, the hydraulic oil of the main chuck cylinder does not pass through the second sequence and check valve, the opening speed of the main chuck cylinder is not slowed, and the stop is stopped. It is an object of the present invention to provide a chuck hydraulic circuit of a tubing device that does not require a valve malfunction prevention mechanism.

  To achieve the above object, the present invention provides a main chuck device that grips and releases a casing tube by a switching operation of a main chuck cylinder, and a sub chuck device that grips and opens a casing tube by a switching operation of a sub chuck cylinder. And a hydraulic circuit having a direction switching valve for switching between the main chuck cylinder and the sub chuck cylinder, and a main chuck gripping operation circuit extending from the direction switching valve of the hydraulic circuit to the gripping side of the main chuck cylinder, A sub-chuck release operation circuit that extends to the open side of the sub-chuck cylinder is connected, and a first sequence and for releasing the casing tube grip of the sub-chuck device when the main chuck device grips the casing tube is connected to the sub-chuck release operation circuit A main chuck opening operation circuit extending from the direction switching valve of the hydraulic circuit to the opening side of the main chuck cylinder and a sub chuck holding operation circuit extending to the holding side of the sub chuck cylinder are connected to the main chuck opening. In the hydraulic circuit for chuck of a tubing device provided with a second sequence and check valve for releasing the casing tube gripping of the main chuck device when gripping the casing tube of the sub chuck device in the operating circuit, the main chuck opening operating circuit includes: A second direction switching valve for switching between a circuit for sucking and discharging hydraulic oil via the second sequence and check valve and a circuit for sucking and discharging hydraulic oil without passing through the second sequence and check valve; It is a feature. The sub chuck gripping operation circuit has a bypass circuit connected between the direction switching valve and the second direction switching valve, and the bypass circuit includes the bypass switching circuit from the sub chuck gripping operation circuit. A check valve is preferably provided that allows the flow of hydraulic oil to the valve.

  As described above, according to the present invention, when the main chuck device is opened, the hydraulic oil of the main chuck cylinder is supplied without going through the second sequence and check valve by the switching operation of the second direction switching valve. The opening speed of the chuck cylinder is not slowed down, and the construction time can be shortened, and the energy loss of the hydraulic circuit is also reduced. Further, by providing a bypass circuit in the sub chuck gripping operation circuit, when the main chuck device and the sub chuck device are interlocked, when the main chuck device grips the casing tube, the sub chuck device reliably opens the casing tube. Therefore, the operation can be performed with peace of mind without providing a structure for preventing the sub chuck device from being damaged.

  Hereinafter, the present invention will be described based on an embodiment shown in the drawings. 1 to 6 show a first embodiment in which the present invention is applied to a hydraulic circuit for a chuck of a tubing device having a wedge-shaped main chuck. The tubing device 1 has an elevating frame 3 on an upper portion of a base frame 2. The lifting frame 3 is supported by a thrust cylinder 4 which is a lifting cylinder standing on the base frame 2 so as to be lifted and lowered, and a ring-shaped rotating body 5 is supported on the lifting frame 3 via a bearing 6. The rotary frame 3 is provided with a rotary drive device 7 that rotates the rotary body 5. The rotation drive device 7 includes a hydraulic motor 8 and a reduction gear mechanism 9 that transmits the output of the hydraulic motor 8 to the rotating body 5.

  A main chuck device 10 is disposed on the rotating body 5. The main chuck device 10 includes a ring-shaped upper frame 11, a plurality of wedge-shaped chuck members 12 suspended from the upper frame 11, a support frame 13 that rotatably supports the upper frame 11, and a lifting frame. 3 and four main chuck cylinders 14 that support the support frame 13 so as to be movable up and down. When the main chuck cylinder 14 is contracted and the support frame 13 is lowered, each chuck member 12 is rotated. 5 is moved downward along the inclined inner surface 5 to reduce the diameter, and the casing tube 15 inserted inside each chuck member 12 is gripped.

  A sub-chuck device 16 that holds the casing tube 15 is provided between the base frame 2 and the lifting frame 3. In the sub chuck device 16, one ends of semi-arc-shaped sub chuck members 17 and 17 are connected to each other by a pin 18, and the other ends of both the sub chuck members 17 and 17 are connected by a sub chuck cylinder 19. Thus, when the sub chuck cylinder 19 is contracted, both the sub chuck members 17 and 17 are reduced in diameter, and the band is configured to grip the casing tube 15 inserted inside the sub chuck members 17 and 17. .

  As shown in FIG. 1, the chuck hydraulic circuit 20 that operates the main chuck cylinder 14 and the sub chuck cylinder 19 returns to the discharge circuit 23 of the pump 22 that supplies hydraulic oil from the tank 21 and the tank 21. A relief valve 25 is provided between the circuit 24 and the discharge circuit 23 connected to the P port of the first direction switching valve 26 and the return circuit 24 connected to the R port of the first direction switching valve 26.

  The first direction switching valve 26 switches the gripping or opening of the main chuck cylinders 14 and the sub chuck cylinders 19, and the main chuck gripping operation circuit 27 to the gripping side of the main chuck cylinders 14 is connected to the A port. Is connected. In the middle of the main chuck gripping operation circuit 27, a sub-chuck release operation circuit 28 is connected to the open side of the sub-chuck cylinder 18. The sub-chuck opening operation circuit 28 is provided with a first sequence and check valve 29. The main chuck gripping operation circuit 27 is provided with a check valve 30 and an accumulator 31 that allow the flow of hydraulic oil from the first direction switching valve 26 toward the main chuck cylinders 14.

  A circuit 34 to the R port of the second direction switching valve 32 is connected to the B port of the first direction switching valve 26. The second sequence and check valve 33 is connected to the P port of the second direction switching valve 32, the main chuck opening operation circuit 35 from the opening side of each main chuck cylinder 14 is connected to the A port, and the B port is connected to the B port. The circuits 36 passing through the second sequence and check valve 33 are connected to each other. The circuit 36 is connected to a sub chuck gripping operation circuit 37 to the grip side of the sub chuck cylinder 19.

  The main chuck opening operation circuit 35 is provided with a check valve 38 that allows the flow of hydraulic oil from the direction of the first direction switching valve 26 to the main chuck cylinders 14. The check valve 38 and the check valve 30 of the main chuck gripping operation circuit 27 are connected to the main chuck opening operation circuit 35 when pressure is generated in the main chuck gripping operation circuit 27 by the operation of the first direction switching valve 26. When the check valve 38 is opened and pressure is generated in the main chuck opening operation circuit 35, the check valve 30 of the main chuck holding operation circuit 27 is opened. The sub chuck gripping operation circuit 37 is provided with a check valve 39 and an accumulator 40 that allow the flow of hydraulic oil from the first direction switching valve 26 toward the sub chuck cylinder 19. The check valve 39 is configured to open when pressure is generated in the sub chuck opening operation circuit 28.

  Next, a gripping operation and an opening operation of the casing tube 15 by the main chuck device 10 alone by the chuck hydraulic circuit 20 will be described. In this case, the sub chuck cylinder 19 is left open. And in the holding | grip operation | movement of the casing tube 15 shown by FIG. 5, while moving the said 1st direction switching valve 26 to the right from the state of FIG. 1, it communicates with P port and A port, B port and R port, respectively. The second direction switching valve 32 is moved to the left from the state shown in FIG. 1 so that the P port and B port, and the A port and R port communicate with each other. In this state, the hydraulic oil from the pump 22 is supplied from the A port of the first direction switching valve 26 to the gripping side of each main chuck cylinder 14 through the main chuck gripping operation circuit 27, and The hydraulic fluid on the open side of 14 directly passes from the main chuck release operation circuit 35 to the R port from the B port of the first directional switching valve 26 via the R port directly from the A port of the second directional switching valve 32. The flow returns to the tank 21 via the return circuit 24, and each main chuck cylinder 14 is gripped.

  Next, as shown in FIG. 6, the opening operation of the main chuck device 10 holding the casing tube 15 is performed by moving the first direction switching valve 26 to the left from the state shown in FIG. The port and the R port are communicated with each other. The second direction switching valve 32 is set at the same position as the above-described gripping operation. In this state, the hydraulic oil from the pump 22 is supplied from the B port of the first direction switching valve 26 to the main chuck opening operation circuit 35 via the A port of the second direction switching valve 32, and It is supplied to the open side of the main chuck cylinder 14. The hydraulic fluid on the gripping side of each main chuck cylinder 14 passes through the main chuck gripping operation circuit 27, returns from the A port of the first direction switching valve 26 to the tank 21 from the return circuit 24 via the R port, and The main chuck device 10 is opened.

  In this way, when the main chuck device 10 is opened, the hydraulic oil from the pump 22 is supplied directly to the main chuck opening operation circuit 35 without passing through the second sequence and check valve 33. The opening time of the main chuck cylinder 14 is not slowed, and the construction time can be shortened.

  7 to 10 show a second embodiment of the chuck hydraulic circuit. The same components as those in the first embodiment will be described with the same reference numerals. The chuck hydraulic circuit 50 according to this embodiment includes a bypass circuit 51 connected between the first direction switching valve 26 and the second direction switching valve 32 from the sub-chuck gripping operation circuit 37 of the chuck hydraulic circuit 20. The bypass circuit 51 is provided with a check valve 52 that allows the flow of hydraulic oil from the sub chuck gripping operation circuit 37 to the first direction switching valve 26.

  FIG. 8 shows a hydraulic circuit when the main chuck device 10 opens the casing tube 15 after the main chuck device 10 grips the casing tube 15 by interlocking the main chuck device 10 and the sub chuck device 16. The first direction switching valve 26 is moved to the right from the state shown in FIG. 7 to connect the P port and the A port, the B port and the R port, respectively, and the second direction switching valve 32 is connected to the P port in the state shown in FIG. And A port, B port and R port are in communication with each other. In this state, the hydraulic oil from the pump 22 passes from the A port of the first direction switching valve 26 to the gripping side of each main chuck cylinder 14 through the main chuck gripping operation circuit 27 as indicated by an arrow. Supplied. The hydraulic fluid on the open side of each main chuck cylinder 14 passes from the main chuck open operation circuit 35 through the A port of the second direction switching valve 32 to the P port, and the check valve of the second sequence and check valve 33. Through the B port of the second directional switching valve 32 through the R port, through the R port from the B port of the first directional switching valve 26 and back to the tank 21 from the return circuit 24. Grips and operates. When the main chuck device 10 grips the casing tube 15 and the pressure of the main chuck gripping operation circuit 27 reaches the set pressure of the first sequence and check valve 29, hydraulic oil is supplied from the main chuck gripping operation circuit 27 to the sub chuck. It flows to the opening operation circuit 28 via the first sequence and check valve 29 and is supplied to the opening side of the sub chuck cylinder 19. The hydraulic fluid on the grip side of the sub chuck cylinder 19 flows from the sub chuck grip operation circuit 37 to the B port of the first direction switching valve 26 via the bypass circuit 51 and the check valve 52, and the first The flow branches from the B port of the two-way switching valve 32 to the B port of the first directional switching valve 26 via the R port, and merges before the B port of the first directional switching valve 26 and enters the first direction switching valve 26. The return circuit 24 returns to the tank 21 from the B port to the R port of the one-way switching valve 26, and the sub chuck cylinder 19 opens. Thereby, after the main chuck device 10 grips the casing tube 15, the sub chuck device 16 opens the casing tube 15.

  FIG. 9 shows a hydraulic circuit when the main chuck device 10 opens the casing tube 15 after the main chuck device 10 and the sub chuck device 16 are interlocked so that the sub chuck device 16 grips the casing tube 15. The first direction switching valve 26 is moved to the left from the state shown in FIG. 7 so that the P port and the B port, the A port and the R port communicate with each other, and the second direction switching valve 32 is connected to the P state shown in FIG. The port and the A port, and the B port and the R port are in communication with each other. In this state, the hydraulic oil from the pump 22 passes through the B port of the second directional switching valve 32 from the B port of the first directional switching valve 26 as indicated by the arrow, and the sub chuck gripping operating circuit. 37 and supplied to the gripping side of the sub chuck cylinder 19. The hydraulic fluid on the open side of the sub chuck cylinder 19 passes through the main chuck gripping operation circuit 27 via the check valve of the first sequence and check valve 29 from the sub chuck opening operation circuit 28 and switches the first direction. The return circuit 24 returns from the A port of the valve 26 to the tank 21 via the R port, and the sub chuck device 16 is gripped. On the other hand, when the sub chuck device 16 grips the casing tube 15 and the pressure of the sub chuck gripping operation circuit 37 reaches the set pressure of the second sequence and check valve 33, the hydraulic oil from the pump 22 is indicated by an arrow. As shown, the second direction switching valve 32 passes through the second sequence and check valve 33 from the B port of the first direction switching valve 26 via the B port of the second direction switching valve 32. The flow from the P port to the main chuck opening operation circuit 35 via the A port is supplied to the opening side of each main chuck cylinder 14. The hydraulic fluid on the gripping side of each main chuck cylinder 14 passes through the main chuck gripping operation circuit 27, returns from the A port of the first direction switching valve 26 to the tank 21 from the return circuit 24 via the R port, and The main chuck device 10 is opened. Thus, after the sub chuck device 16 grips the casing tube 15, the main chuck device 10 opens the casing tube 15.

  FIG. 10 shows a hydraulic circuit for switching from a state in which the casing tube 15 is gripped by the sub chuck device 16 to a state in which the main chuck device 10 is single gripped. The first direction switching valve 26 is in the state shown in FIG. To the right to connect the P port and the A port, the B port and the R port respectively, and the second direction switching valve 32 to the left from the state of FIG. 7 to move the P port and the B port, and the A port and the R port. And communicate with each other. In this state, the hydraulic oil from the pump 22 passes from the A port of the first direction switching valve 26 to the gripping side of each main chuck cylinder 14 through the main chuck gripping operation circuit 27 as indicated by an arrow. Supplied. The hydraulic fluid on the open side of each main chuck cylinder 14 is transferred from the main chuck open operation circuit 35 to the R port from the B port of the first directional switching valve 26 via the R port from the A port of the second directional switching valve 32. The main flow flows to the port, returns to the tank 21 via the return circuit 24, and each main chuck cylinder 14 is gripped. When the main chuck device 10 grips the casing tube 15 and the pressure of the main chuck gripping operation circuit 27 reaches the set pressure of the first sequence and check valve 29, hydraulic oil is supplied from the main chuck gripping operation circuit 27. The flow passes through the first sequence and check valve 29 to the sub chuck opening operation circuit 28 and is supplied to the opening side of the sub chuck cylinder 19. The hydraulic fluid on the grip side of the sub chuck cylinder 19 flows directly from the B port of the first direction switching valve 26 to the R port via the bypass circuit 51 and the check valve 52 from the sub chuck grip operation circuit 37, Return to the tank 21 via the return circuit 24. Accordingly, even when the sub chuck device 16 grips the casing tube 15 and the second direction switching valve 32 is mistakenly operated to switch to the main chuck device 10 alone, the main chuck device 10 does not move to the casing tube 15. Since the sub-chuck cylinder 19 is opened when the grip is held, the sub-chuck device 16 reliably opens the casing tube 15.

  FIG. 11 shows a third embodiment of the present invention in which the main chuck device 10 and the sub chuck device 16 are respectively band-shaped, and the same reference numerals are given to the same elements as in the first embodiment. And simplify the description. The main chuck device 10 includes a chuck member 61 that connects three arcuate chuck belts 61a, 61b, and 61c, and a main chuck cylinder 14 that connects to the ends of the chuck belts 61a and 61c. The hydraulic circuit of the main chuck device 10 and the sub chuck device 16 is configured in the same manner as the second embodiment and operates in the same manner.

Hydraulic circuit diagram for chuck according to the first embodiment of the present invention Similarly, a partial cross-sectional front view of the tubing device Similarly, a plan view of the main chuck device A plan view of the sub-chuck device Hydraulic circuit diagram when the main chuck device grips the casing tube alone Hydraulic circuit diagram when the main chuck device alone opens the casing tube Hydraulic circuit diagram for chuck according to second embodiment of the present invention Hydraulic circuit diagram when main chuck device grips casing tube and sub-chuck device opens casing tube Hydraulic circuit diagram when the sub chuck device grips the casing tube and the main chuck device opens the casing tube Hydraulic circuit diagram when the main chuck device alone grips the casing tube from the state where the sub chuck device grips the casing tube Hydraulic circuit diagram for chuck according to the third embodiment of the present invention Circuit diagram of conventional erroneous operation prevention structure

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Tubing apparatus, 10 ... Main chuck apparatus, 12 ... Chuck member, 14 ... Main chuck cylinder, 16 ... Sub chuck apparatus, 17 ... Sub chuck member, 19 ... Sub chuck cylinder, 20 ... Chuck hydraulic circuit, 26 ... 1st 1 direction switching valve, 27 ... main chuck gripping operation circuit, 28 ... sub chuck opening operation circuit, 29 ... first sequence and check valve, 32 ... second direction switching valve, 33 ... second sequence and check valve, 35 ... main Chuck opening operation circuit, 37 ... sub chuck holding operation circuit, 51 ... bypass circuit, 52 ... check valve

Claims (2)

A main chuck device that grips and releases the casing tube by switching operation of the main chuck cylinder, a sub chuck device that grips and releases the casing tube by switching operation of the sub chuck cylinder, and the main chuck cylinder and the sub chuck cylinder A hydraulic circuit having a direction switching valve for switching, and a main chuck holding operation circuit extending from the direction switching valve of the hydraulic circuit to a holding side of the main chuck cylinder, and a sub chuck opening extending to the opening side of the sub chuck cylinder. An operation circuit is connected, and the sub chuck opening operation circuit is provided with a first sequence and check valve that opens the casing tube grip of the sub chuck device when the casing tube of the main chuck device is gripped. A sub chuck holding operation circuit extending to the holding side of the sub chuck cylinder is connected to the main chuck opening operating circuit extending from the switching valve to the opening side of the main chuck cylinder, and the sub chuck device is connected to the main chuck opening operating circuit. In the hydraulic circuit for chuck of a tubing device provided with a second sequence and check valve for releasing the casing tube grip of the main chuck device when gripping the casing tube, the main chuck opening operation circuit is routed through the second sequence and check valve. And a second directional switching valve for switching between a circuit for sucking and discharging the hydraulic oil and a circuit for sucking and discharging the hydraulic oil without going through the second sequence and check valve. circuit. The sub chuck gripping operation circuit has a bypass circuit connected between the direction switching valve and the second direction switching valve, and the bypass circuit includes the sub chuck gripping operation circuit and the direction switching valve. 2. The hydraulic circuit for chuck of a tubing device according to claim 1, further comprising a check valve that allows the flow of the hydraulic oil.

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