JPH04122793U - Hydraulic circuit for opening and closing wedge chuck in casing pushing machine - Google Patents

Abstract

(57) [Summary] (with amendments) [Purpose] To eliminate friction between the wedge-type chuck plate and the casing in a casing pusher. [Structure] A lifting frame is supported so as to be raised and lowered by a hydraulic cylinder for opening and closing the chuck on a support frame that is supported so as to be raised and lowered by a hydraulic cylinder for pushing the casing, and a plurality of pairs are attached to both of the frames in upper and lower pairs. A chuck device in which a chuck plate is slidably supported on a wedge-shaped chuck pressing plate, which includes a drive hydraulic circuit for extending and contracting each of the hydraulic cylinders, and a cylinder 4 for pushing the casing.
A check valve 42 that prevents the cylinder from shrinking due to the weight of the chuck device is provided in a circuit that can be opened and closed between the rod side and the head side of the chucking device, and a check valve 42 that opens at a set pressure greater than the weight of the chuck device. A counterbalance valve 43 that allows the cylinder to contract is connected in parallel.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This project involves chucking the casings of steel pipe piles, etc. in civil engineering and construction projects, and placing them underground. Regarding the hydraulic circuit for opening and closing the wedge-type chuck in a casing pushing machine that performs pushing. .

0002

[Conventional technology]

Conventionally, support frames were installed on multiple hydraulic cylinders for lifting and lowering the casing, which were erected on the ground. In addition to supporting the frame, there are also multiple chucks for opening and closing that are erected on the support frame. The hydraulic cylinder supports the lifting frame, and these support frames and the lifting frame When multiple pairs of upper and lower wedge-shaped chuck press plates are installed on the Both upper and lower chuck pressing plates have a chuck plate with a double inclined wedge surface on the back surface. A casing pushing machine in which each of the is the supporting frame and lifting frame supported in the same way as above, and one of the supporting frames is Multiple wedge-shaped chuck press plates on the frame, and an inclined wedge surface on the back of the other lifting frame. Attach a plurality of chuck plates each having a The casing pusher is placed in sliding contact with the wedge surface of the chuck pressing plate. and connect the pressure oil supply pipe from the hydraulic pump to the above casing via the solenoid switching valve. branch connection to the rod side and head side of the hydraulic cylinder for lifting and lowering, and Connect the other pressure oil supply pipe from the pump to the above chuck opening/closing via the solenoid switching valve. Casing lift and chuck connected to the rod side and head side of the hydraulic cylinder A drive hydraulic circuit for opening and closing the chuck is generally used. The above can be achieved by switching and supplying pressure oil to the rod side and head side of the opening/closing cylinder. In the former case, move the upper chuck press plate to the lower chuck by raising and lowering the lifting frame. The upper and lower chucks are pressed closer together or away from each other, thereby pressing the upper and lower chucks. Press the chuck plate with the wedge surface of the plate, and in the latter case, press the chuck plate with the chuck pressing plate. The wedge surface of the chuck pressing plate presses the chuck plate. In this way, in both cases, the chuck plate is moved diagonally up and down. to chuck or release the casing, while the above-mentioned casing pushing cylinder By switching and supplying pressure oil to the rod side or head side, the casing can be pushed or performs extraction.

0003

[Problem that the idea aims to solve]

However, with conventional wedge-type chuck devices and hydraulic circuits, the chuck plate is moved diagonally upward and downward. The casing is moved forward and backward in the direction of contact and separation from the outer circumferential surface of the casing. When the chuck plate is pressed against the outer circumferential surface of the casing and when separated from the press-welded This causes scratches, abrasion, and damage to the casing and chuck plate. , deformation, etc. In the present invention, the chuck plate is oriented perpendicularly to the outer peripheral surface of the casing during pressure welding and separation. The goal is to eliminate the drawbacks of the conventional technology by moving it in the opposite direction.

0004

[Means to solve the problem]

As a means of solving the above problem, the first invention of the present application is as follows: Multiple hydraulic cylinders for lifting and lowering the casing are installed vertically on the ground, and A wedge-type chuck device supported by a hydraulic cylinder for raising and lowering the casing so that it can be raised and lowered freely. The wedge-type chuck device is operated by the hydraulic cylinder for lifting and lowering the casing. There are multiple hydraulic systems for opening and closing chucks on or below the support frame that is supported so that it can be raised and lowered. The lift frame is supported by the cylinder so that it can be raised and lowered, and these support frames and the lift frame are Multiple pairs of upper and lower wedge-shaped chuck press plates are attached to the frame. At the same time, press the chuck plate against both pressing wedge surfaces of the upper and lower wedge-shaped chuck pressing plates. In a casing pushing machine that is supported in a compressible and slidable manner,

[0005] Pressure oil supply pipes from the hydraulic pump are raised and lowered into the above casing via respective switching valves. and the hydraulic cylinder for chuck opening/closing, on each rod side and head side. A drive hydraulic circuit connected to each other,

[0006] A circuit that communicates the rod side and head side of the hydraulic cylinder for lifting and lowering the casing. At the same time, an on-off valve is connected to open and close the circuit, and when the circuit is opened, the on-off valve is connected to the circuit. The weight of the wedge-type chuck device causes the hydraulic cylinder for lifting and lowering the casing to shrink. Check valves that should be used to prevent The pressure that should allow the above hydraulic cylinder for lifting and lowering the casing to contract by opening the valve at a constant pressure. a chuck plate movement correction hydraulic circuit formed by connecting control valves in parallel; We proposed a hydraulic circuit for opening and closing a wedge-type chuck in a casing pushing machine.

[0007] The second invention of this application is Multiple hydraulic cylinders for lifting and lowering the casing are installed vertically on the ground, and A wedge-type chuck device supported by a hydraulic cylinder for raising and lowering the casing so that it can be raised and lowered freely. The wedge-type chuck device is operated by the hydraulic cylinder for lifting and lowering the casing. There are multiple hydraulic systems for opening and closing chucks on or below the support frame that is supported so that it can be raised and lowered. The lift frame is supported by the cylinder so that it can be raised and lowered, and these support frames and the lift frame are Multiple wedge-shaped chuck pressing plates on one side of the frame and multiple chuck plates on the other side. At the same time, attach the chuck plate to the pressing wedge surface of the wedge-shaped chuck pressing plate. In a casing pushing machine that can press and slidably abut,

[0008] Pressure oil supply pipes from the hydraulic pump are raised and lowered into the above casing via respective switching valves. and the hydraulic cylinder for chuck opening/closing, on each rod side and head side. A drive hydraulic circuit connected to each other,

[0009] A circuit that communicates the rod side and head side of the hydraulic cylinder for lifting and lowering the casing. At the same time, an on-off valve is connected to open and close the circuit, and when the circuit is opened, the on-off valve is connected to the circuit. The weight of the wedge-type chuck device causes the hydraulic cylinder for lifting and lowering the casing to shrink. Check valves that should be used to prevent The pressure that should allow the above hydraulic cylinder for lifting and lowering the casing to contract by opening the valve at a constant pressure. a chuck plate movement correction hydraulic circuit formed by connecting control valves in parallel; We propose a hydraulic circuit for opening and closing a wedge-type chuck in a casing pusher.

0010 The above-mentioned "pressure control valve" in this proposal is a counterbalance valve or a single unit with the same effect. A body valve or a combination of multiple valves with the same effect is used.

[0011]

【Example】

Figure 1 shows an example of a rotating casing pushing machine. A single lifting jack (2) is provided vertically, and the jack (2) is mounted on the base. Inside the telescopic tube (3) formed by slidably fitting the outer tube to the inner tube fixed to the base stand (1) A hydraulic cylinder (4) is inserted into the cylinder, and one end of the cylinder (4) is connected to one end of the telescopic cylinder (3). The tip of the cylinder ram (5) is connected to the other end of the telescopic tube, and these A wedge-type chuck device is supported by jacks (2) so as to be movable up and down.

0012 The wedge-type chuck device described above is as follows. The lower end of each outer cylinder of the above jack (2)... A hollow annular support frame (6) is horizontally fixed to the Four hydraulic cylinders (7) for opening and closing the chuck are installed vertically on the surface, and these cylinders An annular lifting frame (9) is attached to the upper end of the ram (8) of the bracket (1). 0)..., and this elevating frame (9) and the support frame ( 6), the upper and lower support rings (11) and (12) are placed in a concentric vertical position relationship with each other. The bearings are rotatably supported through bearings (13) and (14), respectively. Upper and lower support rings (11) and (12) are provided with wedge-shaped chuck pressing plates ( 15), (15') are fixed in pairs, and one of the upper chuck pressing plates (15) is The surface is provided with a T-shaped groove whose bottom surface is the chuck pressing wedge surface (16) slanting downward and outward. The chuck guide groove (17) is provided on the inner surface of the other lower chuck pressing plate (15'). A chuck guide groove (17') whose bottom surface is a pressing wedge surface (16') that is inclined outward toward the Each of the upper and lower pairs of chuck pressing plates (15) (15')... Attach the chuck (18) to the upper and lower chuck guide grooves (17) and (17'), respectively. It is engaged.

[0013] The chuck plate (18)... has both upper and lower flow on the back (outer surface) of the approximately rectangular plate-like body. It forms roof-like double inclined wedge surfaces (19) and (19'), and the left and right sides of both wedge surfaces. It has sliding protrusions (20) (20), (20') (20') protruding from the side ends. , the slide protrusions (20), (20) are inserted into the guide groove of the upper chuck pressing plate (15). (17), slide protrusions (20'), (20') are attached to the lower chuck press plate (15). ') are respectively slidably engaged and supported in the guide grooves (17').

[0014] Therefore, the above-mentioned elevating frame is When (9) is raised and lowered, the upper chuck press plate (15)... is moved up and down by the lower chuck press plate ( 15')...The chuck pressing wedge surfaces (16) (16') approach or separate from each other. ,... while sliding the double wedge surfaces (19) (19'),... of each chuck plate (18)... Inward and outward, thereby moving each chuck plate (18) diagonally up and down. to chuck or release the casing (C).

[0015] The mechanism for rotating the chucked casing (C) is the lower support ring ( A large gear (21) is fixed to the outer peripheral surface of the support frame (6), while oil is placed on the support frame (6). A pressure motor (not shown) is installed, and the small gear fixed to the output shaft of the motor is connected to the large gear. It is engaged with the car (21).

[0016] The hydraulic circuit of the casing pushing machine is as follows. As shown in Figure 2, Hydraulic cylinder for lifting and lowering the casing (4)...and hydraulic cylinder for opening and closing the chuck (7) The drive circuit for... is a hydraulic pump ( 23), the pressure oil supply pipes (24) and (25) are branched from the solenoid switching valve. (26) and (27) respectively, and then extend from one switching valve (26). Connect the two pressure oil switching supply pipes (28) and (29) to the cylinder for lifting and lowering the casing. (4) Two valves extending from the other switching valve (27) on each rod side and head side of... Pressure oil switching supply pipes (30) and (31) are connected to the chuck opening/closing cylinder (7)... It is connected to each head side and rod side respectively. The above solenoid switching valve (2 In 6), (32) is the casing pull-out drive side solenoid, and (33) is the push-in solenoid. In the drive side solenoid and the above solenoid switching valve (27), (34) is The chuck closing drive side solenoid (35) is the opening drive side solenoid. (3 6) and (37) are connected to the oil tank from the above switching valves (26) and (27). The release pipe (38) is a relief valve.

A hydraulic circuit for correcting the oblique vertical movement of the chuck plate (18) into vertical movement with respect to the outer peripheral surface of the casing (C) is as follows. In Fig. 2, a pipe (39) with one end connected to each rod side of the casing lifting cylinder (4)... and a pipe (40) with one end connected to each head side are connected to the solenoid on-off valve (41). It connects to two oil ports on one side and connects two oil ports on the other side with a connecting pipe (44) to form a circuit that can be opened and closed, and in this circuit, the on-off valve (41) and the cylinder ( 4) When the circuit is opened, oil flow from the head side to the rod side of each casing lifting cylinder (4) is blocked, that is, each casing lifting cylinder (4) is connected to a chuck device. A check valve (42) to prevent the cylinder from shrinking due to the weight of the casing, and a check valve (42) that opens with a set pressure of "weight of the chuck device + α" when the circuit is opened, and each cylinder for lifting and lowering the casing (4)... In this example for reduction, counterbalance valves (43) are connected in parallel with each other. The value of α is 2 kg/cm ² as an example. (45) is a release tube connected to the connecting tube (44).

[0018] The operation of the above hydraulic circuit is as follows. As an example, push the casing (C) underground. This section explains the case where the The chuck plate (18) is open as shown in Figure 1. In the state shown in FIG. 2, the solenoid on-off valve (41) in the correction circuit is energized. When the valve is opened, the check valve (42) closes the casing lifting cylinder (4)... The oil leakage from each head side is blocked, and the contraction of each lifting cylinder (4) is prevented. The chuck device is stopped, thereby preventing the chuck device from descending due to its own weight. .

[0019] In this state, the chuck closing drive side solenoid (3) of the solenoid switching valve (27) 4) to switch the pressure oil and supply the chuck opening/closing cylinder (7) via the supply pipe (31). ) to the rod side of (9), upper support ring (11) and upper chuck press plate (15)... (hereinafter referred to as chuck The upper part of the device) is lowered and the pressing plate (15) ... and the lower pressing plate (15') cooperate with each other. The chuck plate (18) is advanced diagonally downward by the movement.

[0020] When the advancing chuck plate (18) comes into contact with the outer circumferential surface of the casing, the friction between the two is reduced. Due to the rubbing, the chuck plate (18) is temporarily fixed at the position where it contacts the outer peripheral surface of the casing. Therefore, if the reduction drive of the cylinder (7) is continued, the chuck The upper part of the device descends, and the support frame (6), the lower support ring (12), and the lower press plate (1 5')...etc. (hereinafter referred to as the lower part of the chuck device) tries to rise. In this case, the top When the lower part of the chuck device rises, the casing lifting cylinder (4) )..., but the oil on the rod side of the cylinder (4)... will cause the pipe (39) to extend. ), (40) to the head side, the lifting cylinder ( 4) ... easily extends to allow the lower part of the chuck device to rise, thereby causing the chuck plate to (18)... is displaced in the direction perpendicular to the outer peripheral surface of the casing (C) at the contact position and The casing is strengthened so that it does not rub against the casing. After completing the chuck, The lenoid on-off valve (41) closes to close the correction circuit.

To open the chuck, open the solenoid on-off valve (41) of the correction circuit in Fig. 2, and then energize the chuck opening drive side solenoid (35) of the solenoid switching valve (27) to switch and supply pressure oil. It is supplied to the head side of the chuck opening/closing cylinders (7) through the pipe (30), and each cylinder is driven to extend, whereby the upper part of the chuck device rises and its press plate (15)... and lower press plate ( The chuck plate (18)... attempts to retreat obliquely upward by the cooperation of the chuck plate (15').... However, since the chuck members (18) are fixed at the initial chuck contact position due to friction with the casing (C), the upper part of the chuck device tends to rise and the lower part of the chuck device tends to descend. In this case, when the lower part of the chuck device tries to descend, the weight of the chuck device + the elongation driving force (2 kg/cm ² or more in this example) of the chuck opening/closing cylinder (7) is applied to the casing lifting cylinder (4)... (4)... is applied in the direction of reducing..., thereby opening the counterbalance valve (43) of the correction circuit, and the oil on the head side of the lifting cylinder (4)... passes through the pipes (40) and (39). Since the flow to the rod side becomes possible, the cylinder (4)... easily contracts and allows the lower part of the chuck device to descend, thereby moving the chuck plate (18)... from the initial chuck contact position to the outer periphery of the casing (C). It moves back perpendicular to the surface to release the chuck and does not rub against the casing.

[0022] When the chuck is released, the counterbalance valve (43) has a chuck device. Since only the weight of is added, the valve (43) is closed and the correction circuit is closed.

[0023] The casing pushing machine of FIG. 3 has a plurality of short links (4 6a)... are swingably connected to the pins (47a)... and each link (4 6a) A chuck plate (18 a) are swingably connected by pins (48a), and the lower support ring (12a) is , a wedge-shaped chuck pressing plate (15a) having a chuck pressing wedge surface (16a) is fixed. , the other structure is substantially the same as that in FIG. 1, and its drive hydraulic circuit and correction hydraulic circuit are This is substantially the same as FIG.

[0024] As another example of FIG. 3 above, the chuck pressing plate (15a) in the above example is The chuck plate (18a) is fixed to the lower support ring (11a), and the chuck plate (18a) is fixed to the lower support ring (12a). There is also an example in which they are connected via a link (46a).

[0025]

[Effect of the idea]

Hydraulic pressure for opening and closing the wedge-type chuck in the casing pushing machine of the first and second inventions of the present application According to the circuit, when the chuck plate is pressed against the outer peripheral surface of the casing, and when it is separated from the pressure contact, The chuck plate can be moved in a direction perpendicular to the outer circumferential surface of the casing when This eliminates the friction between the chuck plate and the casing, and reduces the friction between these parts. Scratches, wear, damage, etc. can be sufficiently prevented.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of a casing pushing machine.

FIG. 2 is a hydraulic circuit diagram.

FIG. 3 is a longitudinal sectional front view of another casing pushing machine.

[Explanation of symbols]

4, 4a Hydraulic cylinder for lifting and lowering the casing 6, 6a Support frame 7, 7a Hydraulic cylinder for chuck opening/closing 9, 9a Lifting frame 15, 15', 15a Wedge-shaped chuck press plate 18, 18a Chuck plate 23 Hydraulic pump 24, 25 Pressure oil supply pipe 28, 29, 30, 31 Pressure oil switching supply pipe 26, 27 Solenoid switching valve 41 Solenoid on/off valve 42 Check valve 43 Counter balance valve

Claims (2)

[Scope of utility model registration request] 1. A wedge-type chuck device comprising: a plurality of hydraulic cylinders for lifting and lowering a casing vertically installed on the ground; and a wedge-type chuck device supported by the hydraulic cylinders for lifting and lowering a casing so as to be freely raised and lowered, the wedge-type chuck device comprising: Above or below the support frame, which is supported so as to be raised and lowered by the hydraulic cylinder for raising and lowering the casing, the lifting frame is supported so as to be raised and lowered by a plurality of hydraulic cylinders for opening and closing the chuck, and upper and lower parts are connected to the support frame and the lifting frame. and a casing pushing machine in which a plurality of pairs of lower wedge-shaped chuck pressing plates are respectively attached, and the chuck plates are supported on both pressing wedge surfaces of the upper and lower wedge-shaped chuck pressing plates in a pressable and slidable manner. a drive hydraulic circuit in which the pressure oil supply pipes of the casing are connected to the rod and head sides of the hydraulic cylinder for lifting and lowering the casing and the hydraulic cylinder for opening and closing the chuck, respectively, via switching valves; and the rod of the hydraulic cylinder for lifting and lowering the casing. A circuit is formed to communicate between the side and the head side, and an on-off valve for opening and closing the circuit is connected to the circuit, and when the circuit is opened, the hydraulic cylinder for lifting and lowering the casing is contracted by the weight of the wedge-type chuck device. A chuck formed by connecting in parallel a check valve to prevent the above-mentioned wedge-type chuck device from moving, and a pressure control valve to allow the contraction of the hydraulic cylinder for lifting and lowering the casing by opening the valve at a set pressure greater than the weight of the wedge-type chuck device. A hydraulic circuit for opening and closing a wedge-type chuck in a casing pushing machine, comprising a plate movement correction hydraulic circuit. 2. The wedge-type chuck device includes a plurality of hydraulic cylinders for lifting and lowering the casing vertically installed on the ground, and a wedge-type chuck device that is supported by the hydraulic cylinders for lifting and lowering the casing so as to be freely raised and lowered, the wedge-type chuck device comprising: The lifting frame is supported to be raised and lowered by a plurality of hydraulic cylinders for opening and closing the chuck above or below the support frame which is supported to be raised and lowered by the hydraulic cylinder for raising and lowering the casing. In a casing pushing machine, in which a plurality of chuck plates are attached to the other side of the wedge-shaped chuck pressing plate, and the chuck plate is pressed and slidably abutted on the pressing wedge surface of the wedge-shaped chuck pressing plate, a drive hydraulic circuit in which the pressure oil supply pipes of the casing are connected to the rod and head sides of the hydraulic cylinder for lifting and lowering the casing and the hydraulic cylinder for opening and closing the chuck, respectively, via switching valves; and the rod of the hydraulic cylinder for lifting and lowering the casing. A circuit is formed to communicate between the side and the head side, and an on-off valve for opening and closing the circuit is connected to the circuit, and when the circuit is opened, the hydraulic cylinder for lifting and lowering the casing is contracted by the weight of the wedge-type chuck device. A chuck formed by connecting in parallel a check valve to prevent the above-mentioned wedge-type chuck device from moving, and a pressure control valve to allow the contraction of the hydraulic cylinder for lifting and lowering the casing by opening the valve at a set pressure greater than the weight of the wedge-type chuck device. A hydraulic circuit for opening and closing a wedge-type chuck in a casing pushing machine, comprising a plate movement correction hydraulic circuit.