JP6860187B2 - How to use rotary joints and rotary joints - Google Patents

Description

The present invention relates to a rotary joint and a method of using a rotary joint that supplies a fluid to an apparatus of a device that is driven and rotated in the ground.

Conventionally, a configuration is composed of a case that does not rotate with respect to a shaft that drives and rotates the equipment of the device and a housing that is fixed to the case in the case, and a pair of upper and lower packings are provided for the flow path of the housing. , Known (Patent Document 1).

Special Publication No. 61-52315

Although the details are not described in the above-mentioned known example, conventionally, a pair of upper and lower packings are provided with respect to the flow path of the housing, and sliding streaks are generated between the packings and the shaft, so that the working time can be increased. There is a problem that the sliding muscle becomes deeper with the progress and the fluid leaks.
Further, in a known example, there is a problem that maintenance of a shaft having sliding streaks is not easy, and replacement of the shaft incurs a large cost.
In the present application, maintenance of the sliding muscle of the rotating shaft is not required, and the fluid is prevented from leaking.

In the invention of claim 1, in the rotary joint 10 that supplies fluid to the device 7 of the device 5 that drives and rotates in the ground, the rotary joint 10 has a rotation axis in which the axis for driving and rotating the device 7 is in the vertical direction. The case 11 is composed of a case 11 that does not rotate with respect to the rotating shaft, and a housing 13 having a packing 30 that is slidably contacted with the outer periphery of the rotating shaft provided in the case 11 in a fixed state. A plurality of pipes 17 for supplying fluid to the device 7 are vertically arranged and connected, each of the pipes 17 is connected to a fixed side flow path 20 provided in the case 11, and each fixed side flow path 20 is a housing. It is formed in the receiving portion 21 of the case 11 having a predetermined thickness in the vertical direction supporting the 13, and the rotating side flow path 23 of the rotating shaft is communicated with each fixed side flow path 20 to communicate with each fixed side flow. The housings 13 are provided in the cases 11 on both the upper and lower sides of the road 20, and lid members 18 are detachably provided on the upper and lower sides of each housing 13, and between the lid member 18 and the fixed-side flow path 20. Is provided with a plurality of spacers 32 that can be repositioned in the vertical direction along the axis of the housing 13 and are detachably attached to each other , and the plurality of spacers 32 are fastened while being sandwiched between the lid member 18 and the receiving portion 21. The base of the tool 37 is brought into contact with the lid member 18, and the tip of the fastener 37 is screwed into the receiving portion 21 of the case 11 to fix the rotary joint.
In the invention of claim 2, between the receiving portion 21 and the respective lid members 18 of the case 11 in advance respectively provided with a plurality of spacers 32, the upper and lower either one or both sides of the case 11 a flange section 38 , And the flanges 38 of each case 11 are joined and fixed detachably by a fastener 39 to form a rotary joint in which a plurality of cases 11 are arranged side by side.
In the invention of claim 3, the pipe 17 for supplying the fluid to the device 7 is connected to the fixed side flow path 20 of the case 11 of the rotary joint 10 for supplying the fluid to the device 7 of the device 5 driven and rotated in the ground. A housing 13 having packings 30 on both the upper and lower sides of the fixed side flow path 20 is fitted, and a plurality of pieces are previously provided between the receiving portions 21 of the case 11 on both the upper and lower sides of the fixed side flow path 20 and the lid member 18. The donut-shaped spacer 32 and the packing 30 are fitted to each other, and the fastener 37 is inserted from the opposite side of the receiving portion 21 of the lid member 18 to attach the plurality of spacers 32 and the packing 30 to the lid member 18 and the receiving portion 21. In this state, the tip of the fastener 37 is screwed into the receiving portion 21, and in this state, the equipment 7 of the device 5 performs the work in the ground, and when a predetermined time elapses from the start of the work, the case 11 One of the spacers 32 between the receiving portion 21 and the lid member 18 is taken out, and the taken-out spacer 32 is moved vertically along the axis of the housing 13 from the original position. The work in the ground is restarted by changing the position of and, and when a predetermined time has elapsed from the start of the restart work, one of the plurality of spacers 32 remaining between the lid member 18 and the receiving portion 21 again. This is a method of using a rotary joint in which the spacer 32 is taken out, the taken-out spacer 32 is repositioned in the vertical direction from the original position and attached, and the position of the spacer 32 is sequentially changed by the number of the spacers 32. ..

In the invention of claim 1, since a plurality of spacers 32 between the lid member 18 and the receiving portion 21 of the case 11 are provided so as to be vertically repositionable along the axial center of the housing 13, the position of the spacer 32 can be changed. By changing, the packing 30 of the housing 13 can be slidably contacted with the outer peripheral surface of the rotating shaft 4 having no sliding muscles without maintenance of the sliding muscles of the rotating shaft or replacement of the rotating shaft, and fluid leakage occurs. Can be prevented.
In the invention of claim 2, since the receiving portion 21 of the case 11 and is provided with a plurality of spacers 32 between the lid members 18, the position changing operation of the spacer 32 can be easily, also the case 11 a flange section Since it can be arranged vertically by 38, it is possible to supply several kinds of fluids.
According to the third aspect of the present invention, the position of the spacer 32 can be easily changed, and the packing 30 of the housing 13 has the outer circumference of the rotating shaft without the sliding streaks without maintenance of the sliding streaks of the rotating shaft or replacement of the rotating shaft. It can be slidably contacted with the surface to prevent fluid leakage .

Side view of the excavator. Side view of the rotary joint. The same longitudinal sectional view. The same cross-sectional view. Sectional view of the rotary joint before moving the spacer. Sectional drawing of the rotary joint which moved the 1st spacer. Sectional drawing of the rotary joint which moved the 2nd spacer. Cross-sectional view of the rotary joint before moving the lower spacer. Sectional drawing of the rotary joint which moved the 1st spacer. Sectional drawing of the rotary joint which moved the 2nd spacer. Sectional view of the rotary joint of another example. Sectional view of the rotary joint of another example. Sectional view of the rotary joint of another example.

An embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 is a base machine, and 2 is a leader provided in the base machine 1. A rotary drive unit 3 of a device 5 such as a ground improvement device or an excavation device is attached to the leader 2 so as to be vertically movable, and a rotary shaft is attached to the rotary drive unit 3. Install the upper part of 4 (Fig. 1).
The upper part of the rotating shaft 6 of the device 5 is attached to the rotating shaft 4 via the rotary joint 10. The device 7 of the device 5 is attached to the rotating shaft 6 (FIG. 1).
That is, the device 5 is configured by providing a rotary joint 10 between the lower portion of the rotary shaft 4 below the rotary drive unit 3 and the upper portion of the rotary shaft 6, and the rotary joint 10 supplies a fluid to the device 7 of the device 5. It is to supply. The fluid may be any liquid such as water / solidified liquid (cement milk), hydraulic oil for operating the hydraulic equipment, air (air) used for stirring the liquid, and the like, depending on the equipment 7 of the apparatus 5. It is supplied in various combinations.

The rotary joint 10 has a tubular case 11, in which a tubular housing 13 is tightly fitted, and a rotating shaft (shaft) 14 is freely rotatable and detachable on the inner circumference of the housing 13. It is inserted into and attached (Fig. 2).
The upper part of the rotating shaft 14 is detachably attached to the lower part of the rotating shaft 4, and the upper part of the rotating shaft 6 is detachably attached to the lower part of the rotating shaft 14.
In this case, the rotary joint 10 has a mounting arm 12 interposed between the case 11 and the leader 2 so that the case 11 is in a non-rotating state, and is configured to be able to move up and down with respect to the leader 2. .. (Fig. 1).
The housing 13 and the case 11 are in a non-rotating state with respect to the leader 2, the rotating shaft 14 rotates with respect to the housing 13, and fluid is supplied to the rotating rotating shaft 14 from the non-rotating case 11 and the housing 13. ..
The case 11 is formed with an inflow port 15 for a fluid to be supplied to the rotating shaft 14, a connection nozzle 16 is provided at the inflow port 15, and the tip of a pipe 17 for transferring the fluid is connected to the connection nozzle 16.

The inflow port 15 is formed on the outer end side of the fixed side flow path 20 formed in the case 11. The fixed side flow path 20 is formed at an upper and lower intermediate position of the receiving portion 21 provided in the case 11. The receiving portion 21 is formed in a so-called donut shape having a predetermined thickness to support the housing 13.
At the inner end of the fixed-side flow path 20, a communication groove 22 formed in a ring-shaped recess is provided on the inner circumference of the receiving portion 21. The outer end of the rotation side flow path 23 formed on the rotation shaft 14 is made to face the communication groove 22 in a communication state.
Therefore, the outer end of the rotation side flow path 23 is always open in the communication groove 22, and the fluid flows into the rotation side flow path 23 from the communication groove 22.

Although not shown, the lower portion of the rotation side flow path 23 is integrally communicated with the rotation side flow path formed on the rotation shaft 6 and is connected to the device 7 of the device 5.
Therefore, for example, when the fluid is "water", it is discharged into the ground from the discharge port (not shown) of the device 7 of the device 5 by the rotating side flow path 23, and for example, the fluid is "a liquid such as a solidifying liquid". In the case of ", the ground is improved by discharging into the ground from the discharge port (not shown) of the device 7 of the device 5, and for example, when the fluid is" hydraulic oil ", the expansion blade 24 of the device 7 (not shown). It is sent to a hydraulic device such as a cylinder that expands and contracts Fig. 1).

The rotary shaft 14 mounted on the housing 13 of the rotary joint 10 only needs to be able to supply fluid to the device 7 of the device 5, and has a configuration that also serves as the rotary shaft 4 below the rotary drive unit 3 or the rotary shaft 6 of the device 5. There may be.
The housing 13 is formed in a cylindrical shape, and is held up and down by the receiving portion 21 provided on the case 11 and the lid member 18 described later. A packing 30 is provided on the inner peripheral side of the housing 13. A plurality of spacers 32 are provided between the receiving portion (fixed side flow path 20) 21 and the lid member 18 so as to be vertically repositionable along the axis of the rotating shaft 14.
In this embodiment, housings 13 are provided on the upper and lower sides of the receiving portion 21 (fixed side flow path 20), respectively.

Since the packing 30 is in sliding contact with the outer peripheral surface of the rotating shaft 14, sliding streaks are generated on the outer peripheral surface of the rotating shaft 14 of the sliding portion with the packing 30, and the sliding streaks become deeper after long-term use. As a result, the sealing performance deteriorates due to the deterioration of the packing 30, and fluid may leak from the rotary joint 10. However, in the present application, there is a gap between the receiving portion (fixed side flow path 20) 21 and the lid member 18. Since a plurality of spacers 32 are provided so that their positions can be freely changed in the vertical direction, the rotary joint 10 is disassembled, the housing 13 is removed, and the vertical position of any of the spacers 32 among the plurality of spacers 32 is changed to slide. Change the position of the moving line.

That is, a plurality of spacers 32 are provided between the receiving portion (fixed side flow path 20) 21 and the upper and lower lid members 18, respectively, but in order to facilitate understanding, the packing 30 on the upper side of the receiving portion 21 is provided. Explaining the positional relationship between the (housing 13) and the plurality of spacers 32, as shown in FIG. 5, in the initial state, the sliding line L1 at the position where the packing 30 on the upper side is located with respect to the fixed side flow path 20 (understanding). For the sake of simplicity, the location where the sliding muscles will be formed before the start of the work is shown, regardless of the actual presence or absence of the sliding muscles). When a sign (deterioration) of leakage is observed, the rotary joint 10 is removed from the rotary shaft 4 and the rotary shaft 6, the rotary shaft 14 is removed from the rotary joint 10, and the housing 13 is removed from the case 11 of the rotary joint 10.

Next, the spacer 32 on the upper side of the plurality of spacers 32 laminated on the upper and lower sides is removed, then the housing 13 is returned on the remaining spacer 32, and the spacer 32 removed on the returned housing 13. As shown in FIG. 6, the height of the packing 30 is lowered by the thickness of one spacer 32, and the sliding line L2 of the sliding muscle that will be formed next is positioned under the sliding line L1. To do.
Then, when the position change work of the plurality of spacers 32 in the case 11 is repeated, for example, when two spacers 32 are attached, all of the sliding lines L1 to L3 do not overlap. When the state is reached (FIG. 7) and the depth of the sliding line L3 becomes equal to or greater than a predetermined value and the fluid leaks, the rotating shaft 14 is replaced, but the replacement up to that point is unnecessary.

Similarly, in the packing 30 provided on the lower side of the receiving portion (fixed side flow path 20) 21, as shown in FIG. 8, in the initial state, the packing on the lower side with respect to the receiving portion (fixed side flow path 20) 21. With respect to the sliding line L4 at a certain position of 30, the lower one spacer 32 among the plurality of spacers 32 is removed, then the housing 13 is returned under the remaining spacer 32, and the returned housing 13 When the spacer 32 removed below is stacked, as shown in FIG. 9, the position of the packing 30 is raised by the height of one spacer 32, and the sliding line L5 of the sliding muscle is placed on the sliding line L4. When the position is changed and the position of the plurality of spacers 32 in the case 11 is changed repeatedly as in the case of the upper packing 30, for example, when the two spacers 32 are attached, the sliding is performed. All of the moving lines L4 to the sliding lines L6 do not overlap (FIG. 10).

The method of mounting and changing the position of the plurality of spacers 32 is arbitrary, but as an example, the housing is provided with the plurality of spacers 32 interposed vertically on both the upper and lower sides of the receiving portion 21. 13 is inserted into the case 11, and the housing 13 and the spacer 32 are fixedly attached to the case 11 by the lid member 18 for each of the upper and lower housings 13. Reference numeral 37 denotes a fastener for fixing the lid member 18, and the tip of the fastener 37 is screwed into the receiving portion 21 of the case 11 to fix the lid member 18.
Therefore, simply by changing the position of the spacer 32, the positions of the upper and lower packings 30 (sliding lines) do not overlap with the positions of the spacers 32 before the position change, and the fluid from the packing 30 due to the wear of the rotating shaft 14 Leakage can be prevented.

As a result, fluid leakage can be prevented and maintenance costs can be reduced without replacing or repairing the rotating shaft 14.
Further, the order in which the positions of the spacers 32 are changed can be changed.
That is, in FIGS. 3, 5 and 10, a plurality of spacers 32 are initially provided between the housing 13 and the receiving portion (fixed side flow path 20) 21 in advance, but as shown in FIGS. 11 and 12. If a plurality of spacers 32 are initially provided between each housing 13 and each lid member 18 in advance, the order of changing the positions of the spacers 32 is reversed, but all the sliding lines L are not overlapped. be able to.

In order to facilitate understanding, the spacer 32 whose position is not changed to the lower side of the receiving portion 21 in FIGS. 5 to 7 is not changed to the upper side of the receiving portion 21 in FIGS. 8 to 10. , Each of which does not limit the configuration of the present invention.
Further, since the housings 13 are provided on the upper and lower sides of the inflow port 15 formed in the receiving portion 21 of the case 11, as shown in FIG. 3, a plurality of cases 11 are vertically divided and formed according to the number of pipes 17. Flange portions 38 are provided in the divided cases 11 respectively, and the upper and lower flange portions 38 are fixed by bolts 39, so that different types of fluids such as "soil conditioner" and "hydraulic oil" can be supplied. To do.

Further, when supplying the fluids of "liquid such as solidifying liquid", "water", "air" and "hydraulic oil" to the equipment 7 of the apparatus 5, four pipes 17 are required, as shown in FIG. In addition, each case 11 formed in a plurality of upper and lower parts corresponding to the four pipes 17 may be arranged side by side by fixing the flange portion 38 of each case 11 with a bolt 39.
As shown in FIG. 2, the case cover 40 is attached to the upper and lower surfaces of the uppermost case 11 and the lowermost case 11 by bolts 41, respectively, and the case 11, the rotating shaft 14, and the housing 13 are integrally formed by the case cover 40. Assembled in.

(Action of Embodiment)
The present invention has the above configuration, in which the upper portion of the rotary shaft 14 of the rotary joint 10 is connected to the lower portion of the rotary shaft 4 of the rotary drive unit 3, and the upper portion of the rotary shaft 6 having the device 7 is attached to the lower portion of the rotary shaft 14. The installation of the device 5 is completed.
Next, the rotation drive unit 3 rotates the rotation shaft 4, the rotation shaft 14, and the rotation shaft 6, and operates the device 7 of the device 5 to perform the work.
The device 5 is composed of a ground improvement device, an excavation device, etc., and is composed of a fluid supply device (not shown) composed of a base machine 1 or a pump or compressor installed on the ground, and a hose or the like connecting these to the rotary joint 10. , The fluid is supplied to the rotary joint 10, and the rotary joint 10 supplies the fluid to the rotating shaft 6 that rotates the device 7 of the device 5.

The rotary joint 10 includes a case 11 that does not rotate with respect to the leader 2 side, a housing 13 attached to the case 11, and a rotating shaft 14 rotatably mounted in the housing 13, and is composed of a rotating shaft. A pair of upper and lower housings 13 having packings 30 on the upper and lower sides of a receiving portion (fixed side flow path 20) 21 provided in the case 11 communicating with the rotation side flow path 23 of the 14 are provided on the upper and lower sides of each housing 13. Since a plurality of spacers 32 are provided between the lid member 18 and the receiving portion (fixed side flow path 20) 21 so as to be freely repositionable in the vertical direction along the axial center of the rotating shaft 14, the rotary joint 10 is provided. Is disassembled, the housing 13 is removed, and the vertical position of any of the spacers 32 among the plurality of spacers 32 is changed to change the contact (sliding line) position of the packing 30.

Therefore, only by changing the position of the spacer 32, the positions of the upper and lower packings 30 (sliding lines) do not overlap with the positions of the spacer 32 before the position change, so that the rotation shaft 14 can be rotated without being replaced. Fluid leakage from the packing 30 due to wear of the shaft 14 can be prevented at low cost.

That is, the housing 13 and the plurality of spacers 32 are provided on the upper and lower sides of the receiving portion (fixed side flow path 20) 21, respectively, but in order to facilitate understanding, the upper side of the receiving portion (fixed side flow path 20) 21 is provided. Explaining the positional relationship between the packing 30 and the spacer 32 provided in the above, as shown in FIG. 5, in the initial state, the sliding line at the position where the packing 30 on the upper side is located with respect to the receiving portion (fixed side flow path 20) 21. With respect to L1, the housing 13 was once removed, the spacer 32 at the uppermost position among the plurality of spacers 32 was removed, then the housing 13 was superposed on the remaining spacer 32 and removed on the returned housing 13. When the spacers 32 are stacked, the height of the packing 30 is lowered by the thickness of one spacer 32 as shown in FIG. 6, so that the sliding muscles that can be next slide under the existing sliding line L1 can be slid. The moving line L2 is located.

Therefore, the position of the sliding line can be changed only by changing the position of the spacer 32, and the leakage of fluid can be prevented.
Then, when the work of changing the positions of the plurality of spacers 32 in the case 11 is repeated, for example, when two spacers 32 are attached, all of the sliding lines L1 to L3 are heavy. Since this is not the case (FIG. 7), excavation work can be performed by preventing fluid leakage without performing maintenance work on the rotating shaft 4 for a long period of time.

Similarly, as shown in FIG. 8, in the initial state, the most of the plurality of spacers 32 with respect to the sliding line L4 at the position where the packing 30 on the lower side is located with respect to the receiving portion (fixed side flow path 20) 21. When the spacer 32 at the lower position is removed, the housing 13 is once removed, the housing 13 is returned under the remaining spacer 32, and the removed spacer 32 is placed under the returned housing 13, one sheet is formed as shown in FIG. Since the position of the packing 30 is raised by the height (thickness) of the spacer 32, the sliding line L5 of the sliding muscle that will be formed next is positioned on the existing sliding line L4, and the above-mentioned plurality of sheets When the work of changing the position of the spacer 32 in the case 11 is repeated, for example, when two spacers 32 are attached, all of the sliding lines L4 to L6 do not overlap.

The method of mounting and changing the position of the plurality of spacers 32 is arbitrary, but the housing 13 is provided with the plurality of spacers 32 interposed vertically with respect to the receiving portion (fixed side flow path 20) 21. Since the housing 13 and the spacer 32 are fixedly attached to the case 11 by the lid member 18 by inserting the upper and lower housings 13 into the case 11, the housing 13 and the spacer 32 are sandwiched by the lid member 18 and the receiving portion 21. Will be done.
Therefore, the position of the spacer 32 can be changed simply by attaching and detaching the lid member 18, facilitating the fluid leakage prevention work.

1 ... base machine, 2 ... leader, 3 ... rotary drive unit, 4 ... rotary shaft, 5 ... device, 6 ... rotary shaft, 7 ... equipment, 10 ... rotary joint, 11 ... case, 12 ... mounting arm, 13 ... housing , 14 ... Rotating shaft (shaft), 15 ... Inflow port, 16 ... Connecting nozzle, 17 ... Piping, 18 ... Lid member, 20 ... Fixed side flow path, 21 ... Receiving part, 22 ... Communication groove, 23 ... Rotating side flow Road, 24 ... expansion wings, 30 ... packing, 37 ... fasteners, 40 ... case cover, 41 ... bolts.

Claims (3)

In the rotary joint 10 that supplies fluid to the device 7 of the device 5 that drives and rotates in the ground, the rotary joint 10 has an axis that drives and rotates the device 7 with respect to a rotation axis in the vertical direction and a rotation axis. It is composed of a non-rotating case 11 and a housing 13 having a packing 30 slidably contacting the outer periphery of a rotating shaft provided in the case 11 in a fixed state, and the case 11 supplies fluid to the device 7. A plurality of pipes 17 are vertically arranged and connected, and each of the pipes 17 is connected to a fixed side flow path 20 provided in the case 11, and each fixed side flow path 20 supports the housing 13 in the vertical direction. A case formed in a receiving portion 21 of a case 11 having a predetermined thickness, and a rotating side flow path 23 of the rotating shaft is communicated with each fixed side flow path 20, and cases on both upper and lower sides of the fixed side flow path 20. Each of the housings 13 is provided in 11, and lid members 18 are detachably provided on the upper and lower sides of each housing 13, and a plurality of spacers 32 are housed between the lid member 18 and the fixed side flow path 20. The positions of the spacers 32 can be freely changed in the vertical direction along the axis of the 13 and are detachably provided, and the base of the fastener 37 is held by the lid member 18 and the receiving portion 21 with the plurality of spacers 32. A rotary joint formed by abutting on 18 and fixing the tip of the fastener 37 by screwing it onto the receiving portion 21 of the case 11. According to claim 1, between the receiving portion 21 and the respective lid members 18 of the case 11 in advance respectively provided with a plurality of spacers 32, the flange portion 38 provided on the upper or lower one or both sides of the case 11 , A rotary joint formed by joining the flange portions 38 of each case 11 and detachably fixing them with a fastener 39, and arranging a plurality of cases 11 side by side. A pipe 17 that supplies fluid to the device 7 is connected to the fixed-side flow path 20 of the case 11 of the rotary joint 10 that supplies the fluid to the device 7 of the device 5 that is driven and rotated in the ground, and the fixed-side flow path 20 A housing 13 having packings 30 on both the upper and lower sides of the fixed side flow path 20 is fitted with a plurality of donut-shaped spacers 32 in advance between the receiving portion 21 of the case 11 on both the upper and lower sides of the fixed side flow path 20 and the lid member 18. The packing 30 is fitted, and the fastener 37 is inserted from the opposite side of the receiving portion 21 of the lid member 18 to sandwich the plurality of spacers 32 and the packing 30 between the lid member 18 and the receiving portion 21. Then, the tip of the fastener 37 is screwed into the receiving portion 21, and in this state, the work in the ground is performed by the device 7 of the device 5, and when a predetermined time elapses from the start of the work, the receiving portion 21 and the lid member of the case 11 One of the plurality of spacers 32 between 18 and 18 is taken out, and the taken-out spacer 32 is changed from the original position to the other spacer 32 in the vertical direction along the axis of the housing 13. After the installation and the work in the ground are restarted and a predetermined time has elapsed from the start of the restart work, one of the plurality of spacers 32 remaining between the lid member 18 and the receiving portion 21 is taken out and taken out again. A method of using a rotary joint in which the spacer 32 is mounted by changing the position in the vertical direction from the original position, and the position of the spacer 32 is sequentially changed by the number of spacers 32 .

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