JPH0682139U - Emergency release mechanism for gripping device and traveling guide roller attachment / detachment device for caisson excavator - Google Patents

Abstract

(57) [Summary] [Purpose] In a caisson excavator that moves on a traveling rail provided on the inner wall of a caisson frame, if an abnormality occurs in the excavator operation system, the excavator can be recovered safely and easily in a short time. To do. [Structure] A conduit 5 extending from the main valve 1 for the gripping device that operates the gripping device to the bottom side of the gripping cylinders 6 and 7,
Branch pipes 14 and 16 are provided in a pipe line 12 extending from the main valve 8 for attaching and detaching the traveling guide roller to the bottom side of the detaching cylinder 13, and the pipe line 1
Electromagnetic emergency release valves 15 and 17 are arranged on 4 and 16.
When an emergency electric switch of a system different from the normal operation system is operated, the emergency release valves 15 and 17 are activated and the pressure oil on the bottom side of the grip cylinders 6 and 7 and the detachable cylinder 13 is
It is directly discharged to the hydraulic oil tank 19 through the pipelines 14, 16, 30, 31 and the pipeline 18, and releases the gripping device and the movement guide device which are attached to the traveling rail or the elevating rail of the excavator.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an emergency release mechanism of a gripping device / travel guide roller attaching / detaching device of a caisson excavator.

[0002]

[Prior art]

 As one of the means for excavating the ground inside the open caisson, a pair of upper and lower circular traveling rails and an elevating rail are provided on the inner wall of a cylindrical caisson body, and an excavator is installed along this traveling rail and elevating rail. A ground excavation device that is movable and excavates the ground inside the caisson by the excavator is known. As shown in Japanese Utility Model Laid-Open No. 4-84492, this excavator has a gripping device for fixing the excavator frame to the traveling rail or the elevating rail by pressing grip pads on the upper and lower surfaces of the traveling rail during excavation. As shown in Kaihei 4-82038, it includes a traveling rail and a traveling guide roller that rolls in a guide groove provided on the lower surface of the traveling rail to smoothly move the excavator along the elevating rail. The excavator is equipped with a movement guide device.

As shown in FIG. 3, the gripping device for an excavator according to the above-mentioned actual Kaihei 4-84492 includes upper clamp arms 6a and 7a, lower clamp arms 6b, which are attached to both ends of two gripping cylinders 6 and 7, respectively. 7b swings as the gripping cylinders 6 and 7 expand and contract to grip or release the traveling rails 21 and 22. When the traveling guide roller is disengaged from the guide groove of the traveling rail, the moving guide device of the excavator frame according to the actual exploitation flat 4-82 038 shrinks the disengagement cylinder as shown in the actual exploitation flat 4-82037 and puts it on both ends of the disengagement cylinder. By pulling out the attached stopper pin from the yoke, the travel guide roller is moved in the detaching direction. Further, the present inventor has proposed a traveling guide roller attaching / detaching device which not only detaches the traveling guide roller from the guide groove but also attaches the traveling guide roller to the guide groove by hydraulic pressure, as an improvement of the disassembling device based on the actual flat blade 4-82037. ing. As shown in FIG. 4, this attachment / detachment device is provided on the lower surface of the traveling rails 21 and 22 by swinging the levers 25 and 26 to which the traveling guide rollers 23 and 24 are attached as the detachable cylinder 13 expands and contracts. The running guide rollers 23 and 24 are installed in and removed from the guide grooves. In FIGS. 3 and 4, 27 is a caisson frame and 28 is an excavator.

In the ground excavating device inside the caisson, in addition to the gripping device of the excavator and the traveling guide roller attaching / detaching device, booms, arms, buckets, etc. that constitute the excavator are hydraulically driven to excavate. The machine is also moved by the traveling hydraulic motor driving the rollers that roll on the upper surfaces of the traveling rail and the lifting rail. These hydraulic systems are operated remotely by an operator from a control room located on the ground or based on an automatic control program. The above-mentioned hydraulic cylinders, main valve for operating the hydraulic motor, pilot solenoid valve, pilot check valve, slow return valve, etc. are housed in a closed container, mounted on the excavator frame together with the hydraulic circuit, and in the control room. An electrical switch is provided to operate the pilot solenoid valve.

[0005]

[Problems to be solved by the device]

 In general, groundwater discharge occurs as the ground excavation inside the caisson progresses, so the excavation work is performed underwater. Therefore, if the operation system malfunctions during excavation work and the prescribed excavation cannot be performed, the excavator must be removed from the traveling rail or the lifting rail and raised to the ground for efficient inspection and repair. . However, since the above electric and hydraulic circuits consist of circuits for normal operation only, either one or both of the excavator's gripping device and travel guide roller attachment / detachment device could not be released. In this case, when pulling up the excavator, it is necessary for the worker to dive in the water and disconnect the hydraulic hose, etc. to release the device. This work is dangerous and requires a lot of time, so the work efficiency is greatly reduced. This proposal was made by paying attention to such conventional problems.It is possible to recover the excavator safely and easily in a short time when an abnormality occurs in the excavator operation system inside the caisson. It is an object of the present invention to provide an emergency opening mechanism for a gripping device / running guide roller attaching / detaching device for a caisson excavator.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the emergency release mechanism of the gripping device / travel guide roller attaching / detaching device of the caisson excavator according to the present invention is constructed by laying an excavator for excavating the ground inside the caisson frame along the inner wall of the caisson frame. An excavator that excavates the ground inside the caisson body freely on a pair of upper and lower traveling rails that are partially cut out and a pair of upper and lower elevating rails that partially fill the notched portions of the traveling rails. A caisson excavator equipped with a gripping device for fixing the excavator to a traveling rail or an elevating rail, and a moving guide device for moving the excavator along the traveling rail or the elevating rail. A hydraulic guide roller that operates the gripping device with hydraulic pressure to connect and disconnect the main valve for gripping device from the gripping device main valve to the bottom side of the gripping cylinder and the moving guide device. A drain conduit that branches from these main conduit valves to the bottom of the detachable cylinder and that leads to the hydraulic oil tank is provided on each conduit, and an emergency release valve is installed on each of the drain conduits. In this device, at least one of the pair of gripping cylinders and the detachable cylinder are used as a spring-loaded cylinder that biases the rod retracting side, and an electric emergency valve that operates the electromagnetic emergency release valve is installed in the control room installed on the ground. A switch was provided, and an electric circuit for operating the electromagnetic emergency release valve was provided separately from the power unit and the signal unit.

[0007]

[Action]

 According to the above configuration, a drain conduit extending from the bottom side of the gripping cylinder and the detachable cylinder to the hydraulic oil tank is provided, an electromagnetic emergency release valve is arranged on the drain conduit, and these emergency release valves are driven. Since the electric circuit is provided separately from the power unit or the signal unit, even if an abnormality occurs in the power unit or the signal unit in a normal excavator unit, it is independent from the power unit and the signal unit. The pressure oil on the bottom side of the gripping cylinder and the removable cylinder is discharged to the hydraulic oil tank by operating the emergency release valve provided above. Since the rod of the cylinder with spring is pulled by the tension of the spring, the gripping device and the movement guide device, which are attached to the traveling rail or the elevating rail of the excavator, can be released quickly and easily. As a result, it is possible to safely recover the excavator in a short time without requiring diving work by the operator.

[0008]

【Example】

 An embodiment of an emergency opening mechanism of a gripping device / travel guide roller attaching / detaching device for a caisson excavator according to the present invention will be described below with reference to the drawings. FIG. 1 is a hydraulic circuit diagram in which, of the hydraulic circuits that drive the excavator mounted on the excavator frame, only the hydraulic circuit that drives the gripping device and the traveling guide roller attaching / detaching device is taken out and its outline is described. The hydraulic circuit shown in FIG. 1 is an improved type that allows remote operation not only for removing the travel guide roller of the movement guide device but also for installation on the lifting rail 32 and a temporary rail (not shown) installed on the ground. In addition, a traveling guide roller attaching / detaching device for attaching / detaching the traveling guide roller to / from the lifting rail 32 and a guide groove of a temporary rail (not shown) is provided. Further, FIG. 2A is a diagram showing a pair of upper and lower traveling rails 21 and 22 inside the caisson body, and a mounting relationship of the elevating rails 32 with respect to the traveling rails 21 and 22, and FIG. 2B is a BB line in FIG. It is an arrow view, 27 is a caisson frame, 21 is an upper traveling rail, 21a is an upper rail of an elevating rail 32, 22 is a lower traveling rail, 22a is a lower rail of an elevating rail 32, 33 is a positioning device, and 34 is A stopper, 35 is a vertical rail, and 35a is a guide fitted to the outer peripheral surface of the vertical rail 35. The hatched portion in FIG. 2 (A) corresponds to the lifting rail 32, and the upper rail 21 of the lifting rail 32. a is adjacent to the upper traveling rail 21 at portions a and a, and lower rail 22a is adjacent to the lower traveling rail 22 at b and b.

In FIG. 1, when the electric / hydraulic circuit for normal operation is operating normally, by operating the electric switch of the solenoid valve for the gripping device (not shown) to the gripping side, the main valve 1 for the gripping device is operated. Pilot pressure acts on the gripping side, and the gripping device main valve 1 is switched to the gripping position. As a result, the discharge pressure of the hydraulic pump 2 acts on the bottom side of the gripping cylinders 6, 7 through the pipe lines 3, 4, 5, and the rods of the gripping cylinders 6, 7 are pushed out to the inner wall of the caisson body. Hold the laid running rail from above and below. When releasing the gripping device, the pilot switch acts on the release side of the gripping device main valve 1 by operating the electric switch of the gripping device solenoid valve to the release side, and the gripping device main valve 1 is released. It is switched to the position and the rods of the gripping cylinders 6, 7 are retracted. By operating the electric switch of the solenoid valve for the traveling guide roller attaching / detaching device (not shown) to the installation side, pilot pressure acts on the installation side of the main valve 8 for the traveling guide roller attaching / detaching device, and the main valve for the traveling guide roller attaching / detaching device is operated. The valve 8 is switched to the installation position. As a result, the discharge pressure of the hydraulic pump 9 acts on the bottom side of each detachable cylinder 13 via the pipelines 10, 11, 12 and the rods of each detachable cylinder 13 are pushed out to guide the travel guide into the groove on the lower surface of the traveling rail. The rollers make contact. When disengaging the travel guide roller, by operating the electric switch of the solenoid valve for the travel guide roller attachment / detachment device to the disengagement side, pilot pressure acts on the disengagement side of the main valve 8 for the travel guide roller attachment / detachment device, and the travel guide roller is removed. The main valve 8 for the roller mounting / demounting device is switched to the disengagement position, and the rod of each mounting / demounting cylinder 13 is pulled in.

In the above hydraulic circuit, the emergency release valve 15 is provided on the pipe line 14 branched from the pipe line 5, and the emergency release valve 17 is provided on the pipe line 16 branched from the pipe line 12. The conduits 30 and 31 that have exited the emergency release valves 15 and 17 merge into a single conduit 18, which is connected to the hydraulic oil tank 19. Both the emergency release valves 15 and 17 have solenoids, and since these solenoids are provided separately from the power unit or the signal device, even if an abnormality occurs in this power unit or the signal device, these It is possible to control the excavator from the control room on the ground so that it can be recovered to the ground by a power unit or an electric circuit separate from the signal unit. The gripping device is provided with a plurality of pairs of gripping cylinders 6 and 7, and at least the gripping cylinder 6 has a built-in spring for biasing the rod retracting side. The detachable cylinder 13 also has a built-in spring for urging the rod retracting side in the same manner as described above.

When an abnormality occurs in the normal operation system during excavation work and the excavator is removed from the traveling rail or the ascending / descending rail and is raised to the ground, either or both of the gripping device and the traveling guide roller attaching / detaching device are provided. If both cannot be released, the emergency electric switch is operated to excite the solenoid of either or both of the emergency release valves 15 and 17. When the emergency release valve 15 is excited, the pressure oil on the bottom side of the gripping cylinder 6 flows into the hydraulic oil tank 19 through the pipeline 5, the pipeline 14, the emergency release valve 15, and pipelines 30 and 18, and 6 is operated toward the rod retracting side by the tension of the spring. Similarly, when the emergency release valve 17 is excited, the pressure oil on the bottom side of the removable cylinder 13 flows into the hydraulic oil tank 19 through the pipe line 12, the pipe line 16, the emergency release valve 17, the pipe lines 31 and 18. Then, the attachment / detachment cylinder 13 operates toward the rod retraction side by the tension of the spring. In this way, the pressure oil on the bottom side of the gripping cylinder 6 and the mounting / demounting cylinder 13 is directly discharged to the hydraulic oil tank 19 without passing through the gripping device main valve 1 and the travel guide roller mounting / demounting device main valve 8. Since the electric / hydraulic circuit is provided, even if the main valve 1 for the gripping device and the main valve 8 for the travel guide roller attachment / detachment device become inoperable, the gripping device and the travel guide roller can be easily operated by operating the emergency electric switch. It is possible to operate the excavator attachment / detachment device on the release side and the detachment side, and it is possible to quickly and easily remove the excavator frame 28 from the upper, lower traveling rails 21, 22 or the elevating rails to lift the excavator. .

In this embodiment, the caisson excavator including the traveling guide roller attaching / detaching device for remotely attaching and detaching the traveling guide rollers to / from the upper and lower traveling rails 21 and 22 or the elevating rail has been described. The present invention can also be applied to a caisson excavator equipped with a traveling guide roller disengagement device according to U.S. Pat.

[0013]

[Effect of device]

 As described above, according to the present invention, the drain pipe from the bottom side of the gripping cylinder and the detachable cylinder to the hydraulic oil tank is provided, and the electromagnetic emergency release valve is provided on the drain pipe. Since the electric circuit that drives the release valve is provided separately from the power unit of the excavator or the signal device, even if an abnormality occurs in the power unit of the excavator device or the signal device, these power devices, and By operating the electromagnetic emergency release valve provided independently of the signal device, the pressure oil on the bottom side of the gripping cylinder and the detachable cylinder is discharged to the hydraulic oil tank. Since the rod pulls in the cylinder with spring due to the tension of the spring, the excavator is attached to the traveling rail or the lifting rail. It will be possible to remove it and collect it. With this improvement, it is no longer necessary for the operator to dive and release the gripping device / travel guide roller attachment / detachment device when the excavator operation system fails, as in the past, and the power device or signal device of the excavator device failed. The efficiency of the recovery work of the excavator can be dramatically improved.

[Brief description of drawings]

FIG. 1 is a hydraulic circuit diagram outlining a hydraulic circuit that drives a gripping device and a travel guide roller attaching / detaching device of a caisson excavator.

FIG. 2A is a view showing a pair of upper and lower traveling rails in a caisson body and a mounting relationship of the elevating rails with respect to the traveling rails, and FIG. 2B is a view taken along the line BB in FIG.

FIG. 3 is a side view showing a state where a gripping device grips a traveling rail.

FIG. 4 is a side view showing a state in which the traveling guide roller attaching / detaching device installs the traveling guide roller in the guide groove.

[Explanation of symbols]

1 Main valve for gripping device 3,4,5,10,11,12,14,16,18,3
0,31 Pipe line 6,7 Gripping cylinder 8 Main valve for travel guide roller attachment / detachment device 13 Attachment / detachment cylinder 15,17 Emergency release valve 19 Hydraulic oil tank 21 Upper traveling rail 21a Elevating rail upper rail 22 Lower traveling rail 22a Elevating rail Lower rail 27 Caisson frame 28 Excavator frame 32 Elevating rail 33 Positioning device 34 Stopper 35 Vertical rail 35a Guide

Claims (3)

[Scope of utility model registration request] 1. A pair of upper and lower traveling rails, which are partially cut out, are provided with an excavator for excavating the ground in the caisson skeleton along an inner wall of the caisson skeleton, and a partially notched portion of the traveling rail. A pair of upper and lower lifting rails that satisfy the above, an excavator for excavating the ground inside the caisson body so that it can travel freely, a gripping device for fixing the excavator to the traveling rail, or the elevating rail, and a traveling rail for the excavator, or In a caisson excavator equipped with a movement guide device for moving along an elevating rail, a conduit extending from a main valve for a gripping device that operates the gripping device with hydraulic pressure to a bottom side of a gripping cylinder, and a movement guide device Running guide roller that is attached and detached with hydraulic pressure. From the main valve for the attachment / detachment device to the bottom line of the attachment / detachment cylinder, the hydraulic oil tank is branched from these lines. An emergency release mechanism for a gripping device and a traveling guide roller attaching / detaching device for a caisson excavator, characterized in that a drain pipe leading to the above is provided, and an emergency release valve is provided on each of the drain pipes. 2. A gripping device / travel guide roller for a caisson excavator according to claim 1, wherein at least one of the pair of gripping cylinders and the detachable cylinder are cylinders with springs that bias the rod retracting side. Emergency release mechanism for attachment / detachment device. 3. An electric switch for operating an electromagnetic emergency release valve is provided in a control room installed on the ground, and an electric circuit for operating the electromagnetic emergency release valve is provided separately from a power unit and a signal device. The emergency release mechanism of the gripping device / running guide roller attaching / detaching device of the caisson excavator according to claim 1.