JPH08312870A - Hydraulic hose depressurizer - Google Patents

Abstract

(57) [Summary] [Object] To provide a depressurizing device for a hydraulic hose in a machine for excavating a pipeline, which can connect the hydraulic hose easily and in a short time. According to the present invention, there is provided a depressurizing device 1 for moving a core valve 36 provided at an end portion of a hydraulic hose 26 in an opening direction to release an internal pressure of the hydraulic hose 26.
And a supporting means 4 for engaging the end portion of the hydraulic hose 26 and supporting the pushing means 47 to receive the reaction force thereof. It is a thing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a depressurizing device for releasing internal pressure from a hydraulic hose when the hydraulic hose is replenished by excavation of a pipeline excavator.

[0002]

2. Description of the Related Art Generally, in the construction of underground lines for communication and electric power, vertical shafts such as manholes are provided at predetermined intervals and connected by pipes, and communication and electric power cables, etc. The method of laying is adopted.

As shown in FIG. 7, when connecting vertical shafts with a pipeline, one vertical shaft is used as a starting vertical shaft a, and an excavator b is installed around the vertical vertical shaft a. The excavator b supplies hydraulic pressure to the lead conductor e from the hydraulic device c installed on the ground through the hydraulic hose d,
This hydraulic pressure is used as a power to drive the leading conductor e to excavate. As the leading conductor e is dug, a propulsion pipe f is added to the rear of the leading conductor e, and the leading conductor e is connected to the other vertical shaft, that is, the reaching vertical shaft g.
At the same time, the underground conduit h will be formed.

Particularly, as the leading conductor e is dug, the hydraulic hose d
Is also added or connected, and at this time, the ground connection portion i is once disconnected and a new hydraulic hose is added. In this way, each hydraulic hose d is dividable, and its connecting portion i is formed by male and female couplers provided at both ends of the hydraulic hose d.

[0005]

By the way, a predetermined number of hydraulic hoses d are connected in advance at the initial stage of excavation, and the extra length j thereof is gathered on the ground.

When the digging progresses for a certain distance,
Although it is necessary to add the hydraulic hose d, the internal pressure of the hydraulic hose d becomes very high when the temperature is high in summer. In this case, although the hydraulic hose d can be divided, it is very difficult to connect the hydraulic hose d, and there is a problem that a great amount of labor, time, etc. are spent for the replenishment work.

Therefore, the present invention was devised to solve the above problems, and an object of the present invention is to provide a depressurizing device for a hydraulic hose, which can easily add hydraulic hoses in a short time. .

[0008]

In order to achieve the above object, the present invention provides a depressurizing device for displacing a core valve provided at an end of a hydraulic hose in an opening direction to release the internal pressure of the hydraulic hose. And a pushing means for abutting against the core valve to push in the opening direction, and a supporting means for engaging the end portion of the hydraulic hose and supporting the pushing means to receive its reaction force. Be prepared.

[0009]

In the above structure, when the pushing member pushes the core valve, the reaction force is received by the support means engaging with the end of the hydraulic hose.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a front view showing a depressurizing device according to the present invention. As shown in the drawing, the depressurizing device 1 has a frame 2 placed on an arbitrary place such as the ground or a pedestal. Frame 2
Is made of a steel plate bent in a crank shape, and a manual hydraulic pump 3 is fixed to the upper surface of the top plate portion 2a. A cylinder mechanism 4 is provided on the lower surface side of the top plate portion 2a, and the cylinder mechanism 4 includes a fixed side member 5 welded to the lower surface of the top plate portion 2a and a hydraulic cylinder 6 fixed to the fixed side member 5. Have. A movable side member 8 is attached to the tip of the rod 7 of the hydraulic cylinder 6, and the movable side member 8 moves toward and away from the fixed side member 5 as the rod 7 advances and retracts. One end of a guide rod 9 is fixed to the movable member 8, and the other end of the guide rod 9 is slidably inserted into the fixed member 5. The hydraulic pump 3 and the hydraulic cylinder 6 are connected by a connecting hose 10.

FIG. 2 shows the cylinder mechanism 4, and as shown in the figure, the fixed side member 5 and the movable side member 8 have substantially the same structure, and the fixed side member 5 has a fixing hole 11 provided with a female screw.
The male threaded portion 12 of the hydraulic cylinder 6 is screwed into and attached to the inside. The fixed-side member 5 has a cubic block portion 13 in the center thereof, and storage portions 14 for storing a coupler of a hydraulic hose, which will be described later, are formed on both sides in the width direction of the block portion 13. In the block section 13,
A through hole 15 is formed in the diagonal position so that the other end of the guide rod 9 is inserted therethrough. The accommodating portion 14 has an accommodating wall 16 having a U-shaped cross section, and the upper wall portion 16a and the lower wall portion 16b of the accommodating wall 16 have a right-angled triangular shape whose front-rear length decreases toward the outer side in the width direction. The vertical wall portion 16c of the housing wall 16 is
The upper wall portion 16a and the lower wall portion 16b are vertically spanned, and an engagement groove 18 for fitting and engaging the engagement portion (shown by a virtual line 17) of the coupler is formed in the central portion thereof. Engaging groove 18
The outer side in the width direction is opened so that the engaging portion 17 can be fitted or inserted from the open portion. Further, the respective engaging grooves 18 have different sizes so that they can accommodate the engaging portions 17 having different sizes.

The movable side member 8 has a block portion 19
It has a through hole 20 through which one end of the guide rod 9 is inserted, and a rod connection hole 21 through which the tip of the rod 7 of the hydraulic cylinder 6 is connected. Guide rod 9 inserted in through hole 20
Is fixed by tightening a nut 22 so as to sandwich the block portion 19. A male screw is applied to this portion of the guide rod 9, but the portion inserted into the through hole 15 is finished in a slidable columnar shape. The rod connection hole 21 has an internal thread on its inner surface, and the internal thread has a rod 7
Since the male screw at the tip end is screwed to a certain length and the rotation of the movable member 8 is restricted by the guide rod 9,
The position of the movable member 8 is fixed with respect to the rod 7. Similarly, on both sides in the width direction of the block portion 19, the accommodating portion 2 is also provided.
3 is formed, and the accommodation portion 23 is partitioned by the accommodation wall 24. In particular, the upper wall portion 24a and the lower wall portion 24b of the storage wall 24
Has a right-angled triangular shape symmetrical with the upper wall portion 16a and the lower wall portion 16b. A similar engagement groove 25 is formed in the vertical wall portion 24c of the housing wall 24.

In the depressurizing device 1, the handle 4a of the hydraulic pump 3 is moved up and down a plurality of times, whereby hydraulic pressure is sequentially supplied from the hydraulic pump 3 to the hydraulic cylinder 6 to move the rod 7 to the hydraulic cylinder 6 side. Therefore, in conjunction with this operation, the movable member 8 moves closer to the fixed member 5, and conversely, if the hydraulic pump 3 releases the hydraulic pressure, the movable member 8 moves away in the opposite direction.

FIG. 3 is a vertical sectional front view showing the coupler portion of the hydraulic hose, which has the same construction as the conventional one. Here, one of the hydraulic hoses 26 (on the right side in the figure) has an increased internal pressure due to high temperature of the outside air, and the other hydraulic hose 27 (on the left side in the figure) is newly connected to the previous hydraulic hose 26 or The internal pressure is increased by the connecting hose that is replenished. Each of these hydraulic hoses 26, 27 has a male coupler 28 at one end and a female coupler 29 at the other end, but in the figure, the male coupler 28 of one hydraulic hose 26 and the female coupler 28 of the other hydraulic hose 27 are shown. Coupler 29 is partially shown. By connecting the male and female couplers 28 and 29, the connecting portions of the hydraulic hoses 26 and 27 described above are formed.

First, the male coupler 28 will be described. The male coupler 28 has a connecting pipe 31 which is attached to the outside of the pressure-resistant and oil-resistant flexible hose 30 by crimping or the like. Connection pipe 31
Has a threaded portion 32 at its tip, and a hexagon nut 33 is screwed into the threaded portion 32 to be fixed at the base end position. A male pipe 34 is screwed and attached to the screw portion 32. The male pipe 34 is closed at its tip and has a tapered valve hole 3
5 is provided, and the valve hole 35 is opened and closed by a core valve 36 which is also tapered. Core valve 36
Is urged in the closing direction of the valve hole 35 by a spring 37, and the spring 37 is fixed to a partition wall 38 that partitions the inside of the male pipe 34. The partition wall 38 is provided with a plurality of oil holes 39 for passing hydraulic oil. A semicircular projection 40 having a substantially semicircular cross section is formed on the outer peripheral surface of the male pipe 34 on the distal end side, and a rectangular projection 41 having a rectangular cross section is also formed on the outer peripheral surface of the proximal end thereof. Then, the movement in the longitudinal direction of the pipe is restricted by the rectangular protrusion 41, and the male side connection ring 42 is attached rotatably in the circumferential direction. A connection female screw portion 43 is formed at the tip of the male side connection ring 42.

Similarly, in the female coupler 29, a hexagon nut 33 is fixed to a connecting pipe 31 attached to a flexible hose 30. A female pipe 44 is screwed and attached to the connecting pipe 31, and a cylindrical portion 45 into which the distal end portion 34a of the male pipe 34 is inserted is formed at the distal end portion of the female pipe 44. A valve hole 46 similar to the above is provided in the base end wall of the tubular portion 45, and the valve hole 46 is opened and closed by a core valve 47. The core valve 47 is pressed in the closing direction by a spring 48, and the spring 48 is fixed to a partition wall 50 having a plurality of oil holes 49. On the outer peripheral portion of the female pipe 44,
A female connecting ring 51 is attached so as to be slidable in the longitudinal direction of the tube and rotatable in the circumferential direction. Female side connection ring 5
1 is a rectangular projection 52 and a snap ring 53 of the female tube 44.
The slide movement is restricted by. Further, the female connecting ring 51 is formed with a connecting male screw portion 54 that is screwed into the connecting female screw portion 43 of the male connecting ring 42.

As shown, the couplers 28, 29 of each other
At the time of connection, the male pipe tip portion 34a of the male coupler 28 is inserted into the tubular portion 45 of the female coupler 29 and pressed against each other. Then, the core valves 36 and 47 press each other and retract, thereby opening the valve holes 35 and 46. In this state, if the male and female connecting rings 42, 51 are screwed together,
While the valve holes 35 and 46 are open, the pressed state between the tubular portion 45 and the male pipe tip portion 34a is maintained. In this way, the couplers 28 and 29 are connected to each other, the connection of the hydraulic hoses 26 and 27 is completed, and the working oil can be circulated.

However, when the internal pressure of the hydraulic hoses 26, 27 is high, the core valves 36, 47 cannot be retracted at the initial stage of connection, and in this case, the connection rings 42, 51 do not reach each other and cannot be connected.

Conventionally, a method using a jig shown in FIG. 6 has also been adopted. (A) shows a male coupler jig a, and (b) shows a female coupler jig b. In the male coupler jig a, the male pipe tip portion 34a of the male coupler 28 is inserted into its cylindrical portion c. , The core valve 36 is pushed by rotating the bolt d. Further, in the female coupler jig b, the cylindrical portion e is inserted into the cylindrical portion 45 of the female coupler 29 and the bolt d
Was supposed to turn.

However, in these jigs a and b, the cylindrical portion c or the columnar portion e comes off due to the reaction force received by the bolt d. To prevent this, the jigs a and b are held on the one hand, and the hydraulic pressure is held on the other hand. The hoses 26 and 27 are pressed against each other, and the bolts d are rotated to retract the core valves 36 and 47, thereby leaking the hydraulic oil to release the internal pressure. This requires two persons to work, resulting in inefficiency, and a large amount of work time and labor.

Therefore, the pressure relief device 1 is intended to improve the work efficiency by performing the pressure relief work easily and in a short time when such a hydraulic hose is replenished.

The method of using the device 1 will be described below. First, for example, a part of the connecting pipe 31 exposed in the engaging groove 18 of the fixed side member 5 near the hexagonal nut 33 of the male coupler 28, that is, the above-mentioned. The engaging portion 17 of is engaged or fitted.
On the other hand, the engaging portion 17 of the connecting pipe 31 of the female coupler 29 is engaged or fitted into the engaging groove 25 of the movable side member 8 as described above. By doing so, the respective couplers 28 and 29 are housed in the housing portions 14 and 23 of the respective members 5 and 8.

When the rod 7 is pulled in by operating the hydraulic pump 3, the peripheral portion of the engaging groove 25 of the movable member 8 or the vertical wall portion 24c is caught on the end face of the female pipe 44,
Peripheral portion of the engaging groove 18 of the fixed side member 5 or the vertical wall portion 16
Since c is hooked on the end surface of the male pipe 34, the couplers 28 and 29 are moved closer to each other, or the female coupler 29 approaches the male coupler 28. Due to this approach, the male pipe tip portion 34 of the male coupler 28 is eventually attached to the tubular portion 45 of the female coupler 29.
a is inserted, and the core valves 36 and 47 come into contact with each other. Here, since the internal pressure of the hydraulic hoses 26 and 27 is high, the core valve 3
6 and 47 are difficult to retract, the strong hydraulic pressure of the hydraulic pump 3 and the like overcomes the urging force of the springs 37 and 48 and the internal pressure of the hydraulic hoses 26 and 27, and eventually the core valves 36 and 47. Retract the valve hole 35,
46 is opened.

By doing so, the cylindrical portion 45 of the male pipe tip portion 34a is formed.
Immediately before the plug is completely inserted, the hydraulic oil leaks out and the pressure is released. By completely inserting these and connecting the male side and female side connecting rings 42, 51 by screwing, the couplers 28, 29 through The hydraulic hoses 26 and 27 can be brought into a connected state.

As described above, the core valve 47 of the hydraulic hose 27 serving as a connecting hose forms a pushing means for pushing the core valve 36 of the hydraulic hose 26 to which it is connected, and the cylinder mechanism 4
Engages with the male coupler 28 of the hydraulic hose 26 to allow the core valve 4
A support means is formed to support the hydraulic hose 27 including 7 to receive its pushing reaction force.

Thus, by using this device 1, the hydraulic hoses 26 and 27 can be simultaneously depressurized and connected, and the connection or replenishment work of the hydraulic hoses can be performed easily and in a short time. It is possible to improve work efficiency. In the conventional method using a jig or the like, a work time of 7 minutes was required from the depressurization to the connection, but it could be shortened to 3 minutes by using the present device 1. Further, in the present embodiment, a part of the connecting pipe 31 is engaged, but
For example, the connecting rings 42 and 51 may be hooked by engaging the outer peripheral portions of the male pipe 34 and the female pipe 44.

Next, a modified embodiment will be described.

As shown in FIG. 4, the depressurizing device 1a according to the first modification is a manual type that does not require hydraulic power, and is used here for depressurizing the male coupler 28 in particular. .

The depressurizing device 1a includes a lever member 60 which is a pushing means for pushing the core valve 36, and a support rod 61 which is a supporting means for rotatably supporting the lever member 60 by a pin 62 (fulcrum). It is mainly composed of. The lever member 60 and the support rod 61 are connected like a scissors at an intermediate position in the longitudinal direction, and the lever member 60 is inserted through the hole 63 of the support rod 61. The lever member 60 has its front end bent to the side of the support rod 61, and the contact end 64, which is the front end, has an enlarged cross-sectional area so as to facilitate contact with the core valve 36. The support rod 61 has a fitting portion 65 formed in a bifurcated shape. For example, the proximal end side of the semi-circular projection 40 of the male pipe 34 is fitted into the fitting portion 65, and the lever member 60 and the hand-held portion 66 of the support rod 61 are held by hand while the semi-circular projection 40 is hooked and closed. Depressurization is achieved by pushing the core valve 36 at the contact end 64.

The device 1a has the advantages that it has a very simple structure and can be manufactured at low cost, and at the same time, it is lightweight and convenient to carry. By changing the dimensions of each part as appropriate,
It is optional to correspond to the male and female couplers 28 and 29 and change the fitting portion. Further, since the device 1a obviously applies the lever principle, it is possible to cope with any internal pressure of the hydraulic hose by appropriately determining the length of the hand-held portion 66.

Next, in the second modified embodiment shown in FIG. 5, the depressurizing device 1b is for the female coupler 29, and the core valve 47 is directly connected to the rod (pushing rod) 68 of the hydraulic cylinder 67 (pushing means). It is supposed to be pushed. A fitting member 69 for fitting into the tubular portion 45 of the female coupler 29 is fixed to the main body 67a of the hydraulic cylinder 67. The fitting member 69 penetrates the rod 68 so that the rod 68 can move forward and backward. A ring-shaped protrusion 70 is formed on the surface of the fitting member 69, and a ring-shaped screw member 72 having a female screw portion 71 is detachably engaged with the protrusion 70. Therefore, if the threaded member 72 is threadedly connected to the connection ring 51 of the female coupler 29, the reaction force when the core valve 47 is pushed is received and the fitting member 69 does not move, and the rod 68 causes the core valve 47 to move. Pushing is possible. In this way, the fitting member 69 and the screwing member 72 form a support means for supporting the hydraulic cylinder 67 so as to receive its reaction force.

Various modifications other than the above embodiments are possible, and the present invention is not limited to these embodiments.

[0034]

The present invention exhibits the following excellent effects.

(1) The work of adding hydraulic hoses can be performed easily and in a short time.

(2) The work efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a front view of a pressure relief device according to the present invention.

2A and 2B show a cylinder mechanism, FIG. 2A is a side view, and FIG.
Is a plan view and (c) is a front view.

FIG. 3 is a vertical sectional front view showing male and female couplers.

FIG. 4 shows a first modified embodiment, (a) is a plan view,
(B) is a front view.

FIG. 5 is a partial vertical sectional front view showing a second modified example.

FIG. 6 is a partial vertical front view showing a conventional jig, in which (a) is for a male coupler and (b) is for a female coupler.

FIG. 7 is a diagram for explaining a method of constructing an underground conduit.

[Explanation of symbols]

 1, 1a, 1b Depressurizing device 4 Cylinder mechanism (supporting means) 26 Hydraulic hose 27 Hydraulic hose (connecting hose) 28 Male coupler 29 Female coupler 36 Core valve 47 Core valve (pushing means) 60 Lever member (pushing means) 61 support rod (supporting means) 62 pin (fulcrum) 64 abutting end 65 fitting part 67 hydraulic cylinder (pushing means) 67a main body 68 rod (pushing rod) 69 fitting member (supporting means) 72 screwing member (supporting means) )

Claims (4)

[Claims] 1. A pressure relief device for moving a core valve provided at an end portion of a hydraulic hose in an opening direction to release an internal pressure of the hydraulic hose, wherein the core valve is brought into contact with the core valve and pushed in the opening direction. A depressurizing device for a hydraulic hose, comprising: a pushing means for moving; and a supporting means that engages an end portion of the hydraulic hose and supports the pushing means so as to receive the reaction force thereof. 2. The pushing means is a lever member having an abutting end that abuts the core valve, and the supporting means is a fitting member that fits into a fulcrum of the lever member and an end portion of the hydraulic hose. The depressurizing device for a hydraulic hose according to claim 1, wherein the depressurizing device is a support rod having a joint portion. 3. The fitting member is a cylinder for advancing and retracting a push rod abutting against the core valve, and the supporting member is a fitting member connected to a main body of the cylinder and fitted to an end portion of the hydraulic hose. The depressurizing device for a hydraulic hose according to claim 1, wherein the depressurizing device is a screwing member that is screwed together. 4. The pressing means is a core valve of a connecting hose connected to the hydraulic hose, and the supporting means is a cylinder mechanism for relatively moving the hydraulic hose and the connecting hose. Hydraulic hose depressurizer.