JP4036319B2 - Rotating sleeve support device in continuous water cutting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides, for example, cutting that rotates integrally with a rotating sleeve by rotation of a rotating sleeve that is mounted in a watertight and rotatable manner on a casing provided on an outer peripheral surface of an existing fluid pipe such as a water pipe or a gas pipe. The present invention relates to a rotating sleeve support device in a continuous water cutting device that cuts the existing fluid pipe with a tool.
[0002]
[Prior art]
FIG. 5 is a side view with a partial cross section of a conventional water cutting device for cutting a conventional existing pipe without interrupting the flow of fluid inside, and FIG. 6 is a rotating sleeve support device in FIG. FIG.
[0003]
In FIG. 5, 01 is an existing pipe to be cut, for example, a water pipe, which is cut by a cutting tool 02 such as an end mill set at an elevated position. Conventionally, when this type of water pipe 01 is cut, first, left and right guide sleeves 04, 05, a pair of right and left casings 06, 06, and a rotating sleeve 07 are formed on the water pipe 01 exposed by excavating the ground 03. After attaching in order, the water pipes 01 on both sides of the guide sleeves 04 and 05 are supported by a pair of left and right support bodies 09 erected on the base plate 08.
[0004]
Next, after attaching the gate valve device 010 and the cutting device 011 to the upper opening of the rotary sleeve 07, the drive means such as the drive sprocket 012 and the motor 013 are installed on the base plate 08 below the rotary sleeve 07. At the same time, a driven sprocket (not shown) is attached to the outer peripheral surface of the rotary sleeve 07, and the chain 014 is hung around both sprockets.
[0005]
In this state, the hydraulic motor of the cutting device 011 is operated to rotate the end mill 02, and the end mill 02 is lowered toward the upper end surface of the water pipe 01. Then, after the upper end of the water pipe 01 is perforated by the tip of the end mill 02, the motor 013 is operated to rotate both the chains 014, and the water sleeve 01 is cut by rotating the rotating sleeve 07 once in a fixed direction.
[0006]
At the time of cutting the water pipe, the rotating sleeve 07 is supported by the rotating sleeve supporting means 015 and rotates around the casing 06. As can be seen from FIG. 6 in which the details of the main part of the rotating sleeve supporting means 015 are shown, the rotating sleeve supporting means 015 is composed of a push ring 016 screwed to the rotating sleeve 07 and the axial thrust of the push ring 016. The elastic seal ring 017 is compressed, and the elastic seal ring 017 has a function of preventing the fluid from leaking from the room R surrounded by the casing 06 and a function of supporting the weight of the rotary sleeve 07. is doing.
[0007]
In the conventional rotary sleeve support means 015 described above, an excessive load is applied to the elastic seal link 017 due to the eccentric force based on the drive of the rotating sleeve 07 and the eccentric rotation based on the processing and assembly errors. There was a problem with durability.
[0008]
[Problems to be solved by the invention]
The present invention has been made in view of such circumstances, and the object of the present invention is to improve the water stopping performance by always maintaining a constant compression rate without applying an excessive load to the elastic seal ring. An object of the present invention is to provide a rotating sleeve support device in a continuous water cutting device.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the rotating sleeve support device in the continuous water cutting device according to the present invention includes a rotating sleeve and an elastic seal ring that are made of two resin retainers with respect to a casing provided on the outer peripheral surface of an existing fluid pipe. A continuous water cutting device that is mounted in a watertight and rotatable manner by a support means sandwiched by a ring, and cuts the existing fluid pipe with a cutting tool that rotates integrally with the rotating sleeve,
The rotary sleeve is provided with a push ring, and the compression ratio of the elastic seal ring can be adjusted by adjusting the axial thrust by the push ring, and the outer peripheral surface of the elastic seal ring has a larger contact area than the inner peripheral surface. It is characterized by having.
According to this feature, the eccentric force acting on the rotating sleeve is received on the housing side through the resin retainer ring with low frictional resistance, so that stable rotation support can be achieved, and the elastic seal ring is inexperienced. Since no fluctuation weight is applied, water can always be stopped with a constant compression rate.
[0010]
Further, the compression ratio of the elastic seal ring is adjusted by adjusting the axial thrust by the push ring provided on the rotating sleeve, and the optimum compression ratio of the elastic seal ring is obtained.
[0011]
Moreover, since the load from the rotating sleeve is received by the retainer rings on both sides of the elastic seal ring, more stable rotation support can be achieved.
[0013]
Further, by making the side where the relative rotation occurs correspond to the smaller contact area, it is possible to secure the sealing performance while suppressing the sliding resistance.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partial cross-sectional view of the rotating sleeve support device according to the first embodiment of the present invention, and FIG. 2 is a partial cross-sectional view of the vicinity of the support portion of the rotary sleeve support device according to the second embodiment of the present invention. 3 is a partial cross-sectional view of the vicinity of the support portion of the rotating sleeve support device according to the third embodiment of the present invention, and FIG. 4 is the vicinity of the support portion of the rotation sleeve support device according to a modification of the third embodiment. FIG.
[0015]
In FIG. 1, reference numeral 10 denotes a water pipe to be cut, and a pair of left and right steel guide sleeves 11 and 12 that form a cylindrical shape with a vertically divided structure are arranged at predetermined positions on the outer peripheral surface of the water pipe. The outer ends of the pipes are spaced apart, and the openings at both ends are welded to the outer peripheral surface of the water pipe 10, and the upper and lower butted surfaces are welded to each other so as to be sealed.
[0016]
The outer peripheral surface of the left guide sleeve 11 is formed as a spherical surface 11a centering on the tube axis, and annular stoppers 11b are connected to both left and right ends thereof. The right guide sleeve 12 is formed on a cylindrical surface 12a, and annular stoppers 12b are connected to the outer peripheral surfaces of the left and right ends.
[0017]
Around the water pipe 10 between the left and right guide sleeves 11, 12, a pair of left and right steel casings 15, 16 having a cylindrical shape with a vertically divided structure are provided with a required annular gap between the opposing surfaces. Are formed so as to be formed and integrated by welding the upper and lower butted surfaces.
[0018]
The reason why the guide sleeves 11 and 12 are provided is that after the water pipe 1 is cut and returned to the ground again, a tensile force or a compressive force is applied to the water pipe 1 due to an earthquake, ground subsidence, or the like. This is because, even if a bending moment acts in the direction of movement, the flexible structure is absorbed to absorb the stress acting on the water pipe 1.
[0019]
The inner peripheral surface of the left end portion of the left casing 15 is in sliding contact with the substantially middle portion of the spherical surface 11a of the left guide sleeve 11, and the packing 17 inserted into the annular groove formed at the left end of the casing 15 is bolted. By pressing the split annular ring 19 by 18, the watertightness of the sliding contact surface between the guide sleeve 11 and the left casing 15 is maintained.
[0020]
Similarly, the inner peripheral surface of the right end portion of the right casing 16 is also in sliding contact with the cylindrical surface 12a of the right guide sleeve 12, and the packing 20 inserted into the annular groove formed at the right end of the casing 16 is bolted. By pressing the split annular ring 22 by 21, the watertightness of the sliding contact surface between the guide sleeve 12 and the right casing 16 is maintained.
[0021]
On the outer peripheral surface of the opposite ends of the left and right casings 15 and 16, a rotating sleeve 24 having a vertically divided structure is loosely fitted with a pair of annular grooves 24a on the inner peripheral surfaces of the flanges 15a and 16a of both casings. By this, the movement in the tube axis direction is restricted and the outer fitting is rotatably performed.
[0022]
An elastic seal ring 25 and a retainer ring 26 are inserted into the annular concave grooves 24c formed on the inner peripheral surfaces of both ends of the rotary sleeve 24 in which the guide passage 24b of the cutting tool is formed in the center. By pressing with both sides of the rotating sleeve 24 with push wheels 28 secured to the bolts 27, the watertightness between the outer peripheral surfaces of the housings 15, 16 and the inner peripheral surface of the rotating sleeve 24 is maintained.
[0023]
The retainer ring 26 is made of a resin having low sliding resistance, and when the rotary sleeve 24 rotates around the casings 15 and 16, the dimension C varies due to the weight of the rotary sleeve 24 and the eccentric load during rotation. This is supported by the retainer ring 26. Accordingly, the elastic seal ring 25 always performs a sealing action while maintaining a constant compression rate. And the compression rate of the elastic seal ring 25 can be changed by adjusting the screwing amount of the push ring 28.
[0024]
FIG. 2 is a cross-sectional view of a principal part showing a second embodiment of the rotating sleeve support device of the present invention, and an elastic seal ring 30 is sandwiched between two retainer rings 32 and 32. The push ring 28 is pushed in by the screwing amount of the bolt 27, and the compression rate of the elastic seal ring 30 is changed. Since the retainer rings 32 that support the eccentric load are arranged at two positions at a distance, more stable rotation support can be achieved.
[0025]
The retainer ring 32 used in the second embodiment is different in that it has the retainer ring 26 described in the previous embodiment and a small protrusion 32a. As shown in FIG. 2, small protrusions 32 a are formed on the inner peripheral surface and the outer peripheral surface of the retainer ring 32. Since these small protrusions 32a have a small area in contact with the rotating sleeve 24 or the housing 15, the sliding resistance can be reduced accordingly.
[0026]
Further, when a load more than necessary is applied, or when welding distortion or the like occurs, not only can the small protrusion 32a be deformed and worn, but also the retainer ring 32 can be replaced with the annular groove 24c of the rotating sleeve 24. Even when inserted into the support space, it can be smoothly inserted by the deformation of the small protrusion 32a. The small protrusions 32a are formed on both the inner and outer peripheral surfaces in this embodiment, but may be formed on either one of the peripheral surfaces. The shape of the small protrusion 32a includes not only a granular protrusion but also a ring-shaped one.
[0027]
FIG. 3 is a cross-sectional view of an essential part showing a third embodiment of the rotating sleeve support device of the present invention. The elastic seal ring 34 has a retainer for holding an outer peripheral surface 34a having a larger area than an inner peripheral surface 34b. The rings 36 and 36 are also structured such that the side surfaces can be in close contact with the elastic seal ring 34.
[0028]
When the elastic seal ring 34 is pressed through the retainer rings 36 and 36 by the axial thrust of the pusher wheel 28, the outer peripheral surface 34a having the larger contact area comes into close contact with the rotary sleeve 24. The inner peripheral surface 34b that rotates with the ring 34 and has a small contact area comes into sliding contact with the housing 15, and the sliding resistance can be kept small.
[0029]
FIG. 4 shows another elastic seal ring 38 that can have different contact areas between the inner peripheral surface and the outer peripheral surface. Since the elastic seal ring 38 is partially tapered on the inner peripheral side (38a), the contact area is larger on the outer peripheral surface side than on the inner peripheral surface side. In this case, the retainer ring 40 may be a normal ring having a rectangular cross section.
[0030]
【The invention's effect】
The present invention has the following effects.
[0031]
According to the present invention, since the eccentric force acting on the rotating sleeve is received on the housing side via the resin retainer ring with low frictional resistance, stable rotation support can be achieved, and the elastic seal ring cannot be measured. Therefore, the water can always be stopped with a constant compression rate.
[0032]
In addition, the optimum compression ratio of the elastic seal ring can be obtained by adjusting the axial thrust of the push ring.
[0033]
Moreover, since the load from the rotating sleeve is received by the retainer rings on both sides of the elastic seal ring, more stable rotation support can be achieved.
[0035]
Furthermore, by making the side where the relative rotation occurs correspond to the smaller contact area, it is possible to secure the sealing performance while suppressing the sliding resistance.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view of a rotating sleeve support device according to a first embodiment of the present invention.
FIG. 2 is a partial cross-sectional view in the vicinity of a support portion of a rotary sleeve support device according to a second embodiment of the present invention.
FIG. 3 is a partial cross-sectional view in the vicinity of a support portion of a rotary sleeve support device according to a third embodiment of the present invention.
FIG. 4 is a partial cross-sectional view in the vicinity of a support portion of a rotary sleeve support device according to a modification of the third embodiment.
FIG. 5 is a side view with a partial cross section of a continuous water cutting device for cutting a conventional existing pipe without interrupting the flow of fluid inside.
6 is a detailed view of a main part of the rotating sleeve support device in FIG. 5. FIG.
[Explanation of symbols]
10 Water pipe (existing pipe)
11 Guide sleeve 11a Spherical surface 11b Annular stopper 12 Guide sleeve 12a Cylindrical surface 12b Annular stopper 15 Case 15a Flange 16 Case 16a Flange 17, 20 Packing 18, 21 Bolts 19, 22 Annular ring 24 Rotating sleeve 24a Annular groove 24b Guide passage 24c Annular groove 25 Elastic seal ring 26 Retainer ring 27 Bolt 28 Push ring 30 Elastic seal ring 32 Retainer ring 32a Small protrusion 34 Elastic seal ring 34a Outer peripheral surface 34b Inner peripheral surface 36 Retainer ring 38 Elastic seal ring 38a (tapered) However)
40 Retainer ring

Claims (1)

The rotating sleeve is attached to the casing provided on the outer peripheral surface of the existing fluid pipe so that the elastic seal ring is held by two resin retainer rings in a watertight and rotatable manner, and is integrated with the rotating sleeve. A continuous water cutting device for cutting the existing fluid pipe with a rotating cutting tool,
The rotary sleeve is provided with a push ring, and the compression ratio of the elastic seal ring can be adjusted by adjusting the axial thrust by the push ring, and the outer peripheral surface of the elastic seal ring has a larger contact area than the inner peripheral surface. and wherein the and rotary sleeve supporting device without suspension of water supply cut device.

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