JP2010065386A - Hydraulic piping coupling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a piping coupling device which enables the easy connection or disconnection of hydraulic piping arranged in a working machine, and which can suppress oil leakage during the disconnection. <P>SOLUTION: This hydraulic piping coupling device, which is provided in the joint portion of the hydraulic piping arranged in the working machine, includes: a first stop valve 21 which is connected to one of the pieces of hydraulic piping; a second stop valve 22 which is connected to the other piece of hydraulic piping; and a joint portion 23 for connecting the first and second stop valves together. The joint portion comprises a first connecting portion 24 which is tubularly elongated from a connection-side end of a valve casing 21b of the first stop valve and which has a male screw formed on its outer peripheral surface, a second connecting portion 25 which is tubularly elongated from a connection-side end of a valve casing 22b of the second stop valve and which can communicate with an oil passage S of the first connecting portion, and a cap nut portion 26 which is provided in such a manner as to cover the second connecting portion and which can be screwed to the male screw of the first connecting portion. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hydraulic pipe connecting device provided at a joint portion of a hydraulic pipe arranged in a work machine such as a hydraulic excavator or a building demolition machine.

  When demolishing an old building or plant, a work machine with a crusher attached to the tip of the front attachment is used, especially for dismantling objects that do not have enough floor strength to support the work machine. A special long attachment is set up and dismantled from the top floor.

  The long attachment includes a plurality of attachment parts, for example, a boom, a first arm connected to the tip of the boom, a second arm connected to the tip of the first arm, and a first arm connected to the tip of the second arm. It is composed of 3 arms, a crusher to which the tip of this 3rd arm is connected, etc. The working height can be changed by combining the divided attachment parts, and the size of the crusher to be mounted can be changed. This makes it possible to change the crushing capacity.

  In addition, the hydraulic piping that supplies hydraulic oil for operating the attachment parts is routed along the attachment parts, and the connection of each hydraulic pipe is a coupler provided at the joint part of the attachment parts. The hydraulic system from the hydraulic pump to the crusher is formed.

  When the dismantling work is completed, the above long attachment is disassembled into individual attachment parts, and the hydraulic piping is separated at the coupler portion. Each attachment component disassembled in this way is mounted on a trailer and conveyed in a state where it can comply with various laws and regulations such as the Road Traffic Law.

  In the disassembly work of the long attachment described above, the hydraulic piping can be disconnected at the coupler without the need to remove the bolts, etc., but oil leakage always occurs when disconnecting because the specified pressure is raised in the hydraulic piping. However, there was a problem of polluting the work environment.

  In addition, when assembling the long attachment, it is difficult to connect the coupler because the specified pressure is standing in the hydraulic piping as above, and it is difficult to connect the hydraulic piping at work in high places. I have to.

  Further, as shown in FIG. 10, connecting blocks 52 and 53 each including a stopper valve are provided at joint portions of the hydraulic piping 50 and the hydraulic piping 51, and the hydraulic piping is connected by connecting and fixing the connecting blocks to each other. Things are also known.

  According to the connection blocks 52 and 53, since the pressure is released on the downstream side by closing the stop valve, even if the hydraulic pipes 50 and 51 are disconnected, oil leakage is less than in the case of the coupler.

  However, this type of connection block 52, 53 has a structure in which the connection side end face is brought into contact, a bolt is passed through a through-hole provided in each corner of both connection blocks, and tightened with a nut and fixed. Since both the connecting blocks 52 and 53 need to function as joints, the connecting blocks 52 and 53 in which the stop valve is embedded are enlarged.

  In particular, in a long attachment equipped with a crusher, the weights of the connection blocks 52 and 53 provided for each of a plurality of hydraulic pipes are so heavy that one worker cannot handle them.

  The present invention has been made in consideration of the problems in the joint portion of the conventional hydraulic piping as described above, and can easily connect or disconnect the hydraulic piping routed to the work machine, and at the time of disconnection. A hydraulic pipe coupling device that can suppress oil leakage is provided.

The first aspect of the present invention is:
In the hydraulic piping connecting device provided at the joint of the hydraulic piping routed to the work machine,
A first stop valve connected to one of the hydraulic pipes; a second stop valve connected to the other hydraulic pipe; and a joint connecting the first stop valve and the second stop valve. ,
A connection between the first connecting portion in which the joint portion extends in a cylindrical shape from the connection side end portion of the valve casing of the first stop valve and a male screw is formed on the outer peripheral surface thereof, and the valve casing of the second stop valve A second connecting portion that extends in a cylindrical shape from the side end portion and can communicate with the oil passage of the first connecting portion, and is provided so as to cover the second connecting portion, and the male screw and screw of the first connecting portion are provided. The gist is to include a cap nut portion that can be combined.

  In the hydraulic piping coupling device according to the first aspect, an annular recess or an annular protrusion is formed on the connection side end surface of the first connection portion, and an annular shape is engaged with the connection side end surface of the second connection portion. If an annular concave portion that engages with the convex portion or the annular convex portion is formed, the first stop valve and the second stop valve can be extended in a positioned state.

  Moreover, if the connection side end part of the second connection part and the second stop valve are connected by pressure contact, the existing stop valve can be provided with a joint function.

The second aspect of the present invention is:
In the hydraulic piping connecting device provided at the joint of the hydraulic piping routed to the work machine,
A first stop valve connected to one of the hydraulic pipes; a second stop valve connected to the other end of the hydraulic pipe; a joint connecting the first stop valve and the second stop valve; With
The joint portion extends in a bowl shape from the connection side end portion of the valve casing of the second stop valve, and a first flange extending in a bowl shape from the connection side end portion of the valve casing of the first stop valve. The gist of the invention is that the second flange is provided with fastening means for fastening the first and second flanges.

  In the hydraulic pipe coupling device according to the second aspect, an annular recess or an annular projection is formed on the connection side end surface of the first flange, and an annular projection that engages with the annular recess on the connection side end surface of the second flange. Or if the annular recessed part engaged with the said annular convex part is formed, it can extend in the state which positioned the 1st stop valve and the 2nd stop valve.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to connect or disconnect easily the hydraulic piping currently wired by the working machine, the oil leak at the time of isolation | separation can be suppressed.

  Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings.

1 Configuration of Front Attachment to which the Present Invention is Applied FIG. 1 shows a boom constituting a front attachment of a work machine.

  The boom 10 shown in the figure is composed of a first boom 10a and a second boom 10b connected to the tip of the first boom 10a.

  A boss 10d for inserting a boom foot pin (used for connection to the upper swing body) (not shown) is formed at the base end portion 10c of the first boom 10a, and the distal end portion 10e of the first boom 10a is formed. A boss 10f for inserting a rod connecting pin of a boom cylinder (not shown) is formed on the side.

  The first boom 10a and the second boom 10b are connected by a connecting portion 10i through which two connecting pins 10g and 10h are passed.

  A plurality of hydraulic pipes 11 are routed on the boom upper surface 10j of the first boom 10a, and a hydraulic pipe 12 is also routed on the upper surface of the second boom 10b.

  The hydraulic pipe 12 corresponding to the joint portion is composed of a hydraulic hose 13, and the hydraulic hose 13 is connected to the hydraulic pipe 11 via a hydraulic pipe connecting device (hereinafter abbreviated as a pipe connecting device).

2 First Embodiment of Pipe Connecting Device FIGS. 2 to 5 are enlarged views showing a first embodiment of the pipe connecting device according to the present invention.

  In the plan view of FIG. 2 and the front cross-sectional view of FIG. 3, the pipe connecting device 20 includes a first stop valve 21, a second stop valve 22, and a joint portion 23.

2-1 Configuration of first stop valve The first stop valve 21 houses a cylinder (valve element) 21a in which a passage is formed in a rectangular tube-shaped valve casing 21b, and the cylinder 21a is moved in the direction of arrow A. It is of the cock type that switches the flow path by rotating it.

  By attaching and operating a tool on the hexagon head 21c of the stop valve, the oil passage S in the valve can be switched between the shut-off position and the communication position. Reference numeral 21d denotes a stopper for restricting the rotation limit of the cylinder 21a.

  A port 21e for connecting the hydraulic pipe 11 is provided at the inlet of the oil passage S in the valve casing 21b.

2-2 Configuration of Second Stop Valve The second stop valve 22 has basically the same configuration as the first stop valve 21. 22a is a cylinder, 22b is a valve casing, 22c is a hexagon head, 22d is a stopper, 22e. Is a port for connecting the hydraulic hose 13.

2-3 Configuration of Joint Part The joint part 23 includes a first connection part 24 that extends in a cylindrical shape from the connection side end of the valve casing 21b of the first stop valve 21 and has an external thread formed on the outer peripheral surface thereof. A second connection portion 25 that extends in a cylindrical shape from the connection side end of the valve casing 22b of the second stop valve 22 and can be engaged with the first connection portion, and is locked to the second connection portion 25. In this state, it is mainly composed of a cap nut portion 26 that can be screwed with the male screw of the first connecting portion 24.

  The inner diameter B of the first connecting portion 24 is formed to be larger than the diameter of the oil passage S so that an annular recess 24a is formed, and an O-ring 27 is attached to the inner peripheral surface of the annular recess 24a. Yes.

  The second connection part 25 is formed at the connection side end of the valve casing 22b, a cylinder part 25a connected to the end surface of the valve casing 22b, and a flange part formed on the connection side of the cylinder part 25a. 25b and the insertion part (annular convex part) 25c formed in the connection side further of this collar part 25b are comprised integrally.

  The arrangement of the annular recess 24a and the annular projection 25c may be reversed in the direction of the oil passage S.

  Further, as the material of the valve casing 22b and the material of the second connection portion 25, metal materials such as mechanical structural steels such as S25c and S45c, and stainless steels such as SUS304 can be used. A predetermined strength required for the pipe connecting device can be obtained.

  In addition, at the time of pressure welding, heating by a gas burner, induction heating, etc. can be used together as needed.

  Thereby, it becomes possible to give a joint function using the valve casing of the existing stop valve.

  The inner diameter of the insertion portion 25 c is the same as the diameter of the oil passage S, and the outer diameter is slightly smaller than the inner diameter B of the first connection portion 24. Thereby, the connection side end surface of the flange portion 25b comes into contact with the connection side end surface of the first connection portion 24, and the insertion portion 25c is inserted and positioned inside the first connection portion 24.

  The cap nut portion 26 can be rotated about the central axis C, and a female screw that meshes with the male screw of the first connecting portion 24 is formed on the inner peripheral surface thereof. Therefore, when the tool is mounted on the chamfering portion 26a for tool mounting formed on the outer peripheral surface of the cap nut portion 26 and rotated clockwise, the cap nut portion 26 moves in the direction of arrow D and the first connecting portion 24 is moved. And the second connecting portion 25 are in close contact with each other, and as a result, the first stop valve 21 and the second valve portion 22 are connected.

2-4 Mounting Structure of Pipe Connecting Device FIG. 4 is a left side view showing a structure for fixing the pipe connecting device 20 to the boom upper surface 10j.

  In addition, since the fixing structure of the pipe connection device 20 is the same for both the first stop valve 21 and the second stop valve 22, the structure of the first stop valve 21 will be described as a representative.

  In the figure, a substantially square fixing plate 28 is disposed at the bottom of the first stop valve 21. The valve casing 21b and its fixing plate 28 are bolts 29, 29 (only the right side in the figure is shown) and bolts 30, 30 (only the back left side is shown).

  The diameters of the bolts 29 and 29 planted in the vicinity of the port 21e are smaller than the diameters of the bolts 30 and 30 implanted in the vicinity of the sleeve 26. This is the thickness of the valve casing 21b in the vicinity of the port 21e. This is because the thickness is reduced by the presence of the port 21e.

  Bolt holes 29 ′ and 29 ′ into which the bolts 29 and 29 are screwed and bolt holes 30 ′ and 30 ′ into which the bolts 30 and 30 are screwed are formed at four locations in the valve casing 21 b (FIG. 2). reference).

  The recess 28a formed on the upper surface of the fixing plate 28 is for avoiding interference with the cylinder 21a (see FIG. 3).

  The fixing plate 28 is similarly attached to the second stop valve 22.

  The pipe connecting device 20 to which the fixing plates 28 and 28 are attached is fixed to the boom upper surface 10j by using four fixing bolts 31.

2-5 Detachment of Pipe Connecting Device FIG. 5 is a front sectional view showing a state where the pipe connecting device 20 is cut off.

  After the cylinders 21a and 22a are rotated to the shut-off position, when the cap nut portion 26 screwed into the male screw of the first connection portion 24 shown in FIG. 3 is rotated counterclockwise, the second stop valve The connection between the first stop valve 21 and the second stop valve 22 is released when the screw 22 is retracted in the direction of the arrow E and the screw connection between the first connection part 24 and the cap nut part 26 is released.

  The oil passage S located on the connection side from the cylinder 21a and the oil passage S located on the connection side from the cylinder 22a have a slight amount of working oil, so that oil leaks. Since it is not standing, it can be processed easily.

3 Second Embodiment of Pipe Connecting Device FIGS. 6 to 9 are enlarged views showing a second embodiment of the pipe connecting device according to the present invention.

  In the plan view of FIG. 6 and the front cross-sectional view of FIG. 7, the pipe connecting device 40 includes a first stop valve 41, a second stop valve 42, and a joint portion 43.

3-1 Configuration of First Stop Valve The first stop valve 41 houses a cylinder (valve element) 41a in which a passage is formed in a rectangular tubular valve casing 41b, and the cylinder 41a is moved in the direction of arrow F. This is a cock type switch that switches the flow path by rotating it 90 °.

  A hexagon head 41c for tool mounting is provided at the upper end of the cylinder 41a, and 41d is a stopper for restricting the rotation limit of the cylinder 41a.

  A port 41e for connecting the hydraulic pipe 11 is provided at the inlet of the oil passage S in the valve casing 41b.

3-2 Configuration of Second Stop Valve The second stop valve 42 has basically the same configuration as the first stop valve 41, 42a is a cylinder, 42b is a valve casing, 42c is a hexagon head, 42d is a stopper, 42e Is a port for connecting the hydraulic hose 13.

3-3 Configuration of Joint Part The joint part 43 includes a first flange 43a provided at the connection side end of the first stop valve 41 and a second side provided at the connection side end of the second stop valve 42. It is mainly composed of a flange 43b and a hexagon socket head cap screw (fastening means) 43c for connecting both flanges 43a and 43b.

  As shown in FIG. 8 showing the left side surface of FIG. 6, the first flange 43a is composed of parallel upper side 43d and lower side 43e, and side sides 43f and 43g that connect the upper side 43d and lower side 43e in an arc shape. Has been. The reason why the first flange 43a is cut out in the vertical direction is to make it compact.

  Further, as shown in FIG. 7, an annular recess 43h that is annularly formed is formed on the connection side surface of the first flange 43a.

  On the other hand, the second flange 43b has the same contour shape as the first flange 43a, and is formed with an annular convex portion 43i that can be fitted to the annular concave portion 43h.

  The oil passage S between the first stop valve 41 and the second stop valve 42 is formed by fitting the annular convex portion 43i formed on the second flange 43b into the annular concave portion 43h formed on the first flange 43a. Are communicated with each other in a positioned state. An O-ring 43k for securing a seal of the connected oil passage S is attached to the connection side end face 43j of the second flange 43b.

  The arrangement of the annular convex portion 43i and the annular concave portion 43h may be reversed in the direction of the oil passage S.

  The first flange 43a and the second flange 43b are connected by a hexagon socket head bolt 43c shown in FIG. In detail, the neck portion of the hexagon socket head bolt 43c is passed through the through-hole formed in the second flange 43b, and the neck portion 43c 'is screwed into the female screw portion formed in the first flange 43a, whereby both the flanges 43a. And 43b are connected.

3-4 Mounting structure of pipe connecting device FIG. 9 is a left side view showing a structure for fixing the pipe connecting device 40 to the boom upper surface 10j.

  Since the first stop valve 41 and the second stop valve 42 have the same fixing structure for the pipe connecting device 40, the structure of the first stop valve 41 will be described as a representative.

  In the figure, a substantially square fixing plate 44 is disposed at the bottom of the first stop valve 41. The valve casing 41b and its fixing plate 44 are provided with bolts 45, 45 (only the front right side is shown) and bolts 46, 46 (only the back left side is shown).

  The diameters of the bolts 45 and 45 implanted near the port 41e are smaller than the diameters of the bolts 46 and 46 implanted near the first flange 43a. This is because the wall thickness is reduced by the presence of the port 41e.

  Bolt holes 45 'and 45' into which the bolts 45 and 45 are screwed and bolt holes 46 'and 46' into which the bolts 46 and 46 are screwed are formed in the valve casing 41b at four locations (FIG. 6). reference).

  The recess 44a formed on the upper surface of the fixing plate 44 is for avoiding interference with the cylinder 41a described above, as shown in FIG.

  The fixing plate 44 is similarly attached to the second stop valve 42.

  The pipe connecting device 40 to which the fixing plates 44, 44 are attached is fixed to the boom upper surface 10j using four fixing bolts 47 (see FIG. 6).

  In the above-described embodiment, the pipe connecting device according to the present invention has been described by taking an example of connecting a hydraulic pipe routed to a boom of a work machine. It can be applied to any hydraulic piping joint portion that needs to be disconnected.

  In addition, the working machine of the present invention includes a civil engineering work machine such as a hydraulic excavator, a construction work machine such as a building demolition machine and a crusher that crushes reinforced concrete, a cargo handling work machine, and a forestry work machine equipped with a grapple. Etc. are included.

  Moreover, the pipe connection device according to the present invention can be applied to any industrial equipment or plant equipment that needs to block a flow path.

It is a principal part front view of the boom which installed the piping connection apparatus which concerns on this invention. 1 is a plan view showing a first embodiment of a pipe connecting device according to the present invention. FIG. 3 is a front sectional view of FIG. 2. It is a left view which shows the boom fixing structure of the piping connection apparatus shown in FIG. It is front sectional drawing which cut | disconnected the piping connection apparatus of FIG. It is a top view which shows 2nd embodiment of the piping connection apparatus which concerns on this invention. It is front sectional drawing of FIG. It is a left view of the 1st stop valve shown in FIG. It is a left view which shows the boom fixing structure of the piping connection apparatus shown in FIG. It is a principal part front view of the boom which installed the conventional piping connection apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Boom 10a 1st boom 10b 2nd boom 10c Base end part 10j Boom upper surface 11 Hydraulic piping 12 Hydraulic piping 13 Hydraulic hose 20 Piping connection device 21 1st stop valve 21a Cylinder 21b Valve casing 21c Hex head 21d Stopper 21e Port 22 2nd Stop valve 23 Joint part 24 First connection part 25 Second connection part 26 Cap nut part 27 O-ring 28 Fixing plate 29 Bolt 30 Bolt 31 Fixing bolt

Claims (5)

In the hydraulic piping connecting device provided at the joint of the hydraulic piping routed to the work machine,
A first stop valve connected to one of the hydraulic pipes; a second stop valve connected to the other hydraulic pipe; and a joint connecting the first stop valve and the second stop valve. ,
A connection between the first connecting portion in which the joint portion extends in a cylindrical shape from the connection side end portion of the valve casing of the first stop valve and a male screw is formed on the outer peripheral surface thereof, and the valve casing of the second stop valve A second connecting portion that extends in a cylindrical shape from the side end portion and can communicate with the oil passage of the first connecting portion, and is provided so as to cover the second connecting portion, and the male screw and screw of the first connecting portion are provided. A hydraulic pipe connecting device comprising a cap nut portion that can be combined.   An annular concave portion or an annular convex portion is formed on the connection side end surface of the first connection portion, and an annular convex portion engaging with the annular concave portion or an annular shape engaging with the annular convex portion on the connection side end surface of the second connection portion The hydraulic pipe coupling device according to claim 1, wherein a recess is formed.   3. The hydraulic pipe coupling device according to claim 1, wherein a connection side end portion of the second connection portion and the second stop valve are connected by pressure contact. In the hydraulic piping connecting device provided at the joint of the hydraulic piping routed to the work machine,
A first stop valve connected to one of the hydraulic pipes; a second stop valve connected to the other end of the hydraulic pipe; a joint connecting the first stop valve and the second stop valve; With
The joint portion extends in a bowl shape from the connection side end portion of the valve casing of the second stop valve, and a first flange extending in a bowl shape from the connection side end portion of the valve casing of the first stop valve. A hydraulic pipe coupling device comprising: the second flange formed, and fastening means for fastening the first and second flanges.   An annular recess or an annular projection is formed on the connection side end surface of the first flange, and an annular projection or an annular recess that engages the annular recess on the connection side end surface of the second flange. The hydraulic piping connecting device according to claim 4 formed.