JP2003239671A - Structure for positioning swivel joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure for positioning a swivel joint, which can achieve installation of the swivel joint without fail by slightly changing a conventional structure. <P>SOLUTION: The swivel joint 1 includes a spindle 3 and one or two or more decentered channels 25, 26 formed therein. According to the swivel joint positioning structure, when the swivel joint 1 is installed in a machine at a location between a swivel 40 and a rotary rod 50 via adapters 4, 5, at least one of a plurality of bolts 31 for fixing the adapter 5 arranged on an installation surface to the spindle 3, is formed of a positioning bolt 32 which has its head 32a protruded from the installation surface. Further, the installation surface of the swivel joint with respect to each of the rotary rod 50 and the swivel 40 has a positioning hole 52 into which the head 32a of the positioning bolt 32 is inserted. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swivel joint in which an eccentric flow path for sending hydraulic oil is formed in addition to the axial flow path in order to send the hydraulic oil to, for example, a stirring rod equipped with an actuator. The present invention relates to a positioning structure that can be assembled so that a flow path matches a stirring rod side correctly.

[0002]

2. Description of the Related Art In the construction and civil engineering work, in order to improve soft ground, a ground improving machine is used which hardens the ground by injecting and stirring a ground improving agent such as cement milk into an excavated hole. FIG. 4 is a side view showing the ground improvement machine. This ground improvement machine 100 is configured by using a pile driver 110 as a base machine, and the pile driver 110 is
An upper revolving structure 112 including a cockpit is rotatably provided on a traveling unit 111 that can be driven by a crawler, and a leader 113 is provided in front of the upper revolving structure 112 and a back stay 11 is provided.
It is supported by 4 so that it can rise and fall.

The ground improvement machine 100 is a pile driving machine 11 as described above.
An auger 70 as a working device is attached to the leader 113 of 0 so as to be movable up and down, and a stirring rod 80 is attached to the auger 70 so as to be rotated. The stirring rod 80 attached here has a lower end provided with a screw blade 81 that can be opened and closed by a hydraulic actuator, and a ground improvement agent such as cement milk is injected from the screw blade 81. Therefore, the rod portion 82 of the stirring rod 80 has a shaft center flow path for the improvement agent that sends a ground improvement agent such as cement milk to the screw blade 81, and a hydraulic oil that circulates the operation oil that opens and closes the screw blade 81. And an eccentric flow path.

A swivel 40 is fixed to the top of the stirring rod 80, which is attached to the auger 70 so as to be rotatable, through a swivel joint 10. In the swivel 40, a rotating portion connected to the stirring rod 80 side via the swivel joint 10 and a body to which a grout hose (not shown) is connected are assembled via bearings, and even if the stirring rod 80 rotates, It is designed to prevent rotation from being transmitted to the grout hose. Cement milk or the like is supplied through the swivel 40 into the rotating stirring rod 80.

The axial flow path through which cement milk and the like flow is
The eccentric flow passage for hydraulic oil is formed so as to pass through the axial center from the swivel 40 to the stirring rod 80, and generally two flow passages of a forward path and a return path are formed at symmetrical positions sandwiching the axial center flow path. Has been done. These two flow paths cause the hydraulic actuator to perform a predetermined operation such that the screw blade 81 is opened by supplying hydraulic oil from one direction and the screw blade 81 is closed by supplying hydraulic oil from the opposite direction. Therefore, the open side and the closed side are decided. And
The supply and discharge of the hydraulic oil to and from the hydraulic oil passage are performed from a housing that is a non-rotating portion of the swivel joint 10, and the eccentric flow passage formed in a spindle that rotates in the housing, as will be described later in detail. Communicates with.

[0006]

By the way, conventionally, since the two eccentric flow passages on the open side and the closed side are located symmetrically with respect to the axial flow passage, such a stirring rod 80 with an actuator is When assembling the swivel joint 10, there is a risk that the stirring rod 80 and the swivel joint 10 may be connected oppositely on the open side and the closed side. If they are connected in the opposite way, the flow of hydraulic fluid to the actuator will be reversed, and the opening / closing operation of the screw blade 81 will be the opposite of the operator's operation.
There was a problem that it could cause damage or unexpected trouble.

Therefore, an object of the present invention is to provide a positioning structure for a swivel joint that can be assembled without fail by simply changing the structure.

[0008]

A swivel joint positioning structure according to the present invention comprises a non-rotating body housing,
A swivel joint having a rotatable spindle inserted into the housing and adapters fixed to the both ends of the spindle with a plurality of bolts, and one or more eccentric flow passages formed in the spindle. A head for mounting at least one bolt among a plurality of bolts for fixing the adapter arranged on the mounting surface to the spindle for assembling between the swivel and the rotating rod via the adapter. The positioning bolt is configured to protrude from the mounting surface, and a positioning hole into which the head of the positioning bolt is inserted is formed on the mounting surface of the rotating rod or the swivel.

Therefore, according to the present invention, when the swivel joint is assembled to the rotary rod or the like, by aligning the positioning bolt with the positioning hole, the eccentric flow path and the spindle formed in the swivel joint or the rotary rod can be attached to the spindle. The formed eccentric flow path is properly aligned. For example, even in the case where the eccentric flow paths on the open side and the closed side, which are also mentioned in the above problems, are formed at symmetrical positions, the assembly relationship with the swivel joint or the rotating rod is uniquely determined, It does not make the mistake of reversing the open and closed sides. Further, this positioning structure can be achieved by a simple structure change without adding another component by using the bolt, which is an essential element constituting the swivel joint, as the positioning member.

Further, the positioning structure of the swivel joint according to the present invention is characterized in that the positioning bolt is different in size from other bolts. Therefore, according to the present invention, the position of fixing the adapter of the positioning bolts of different sizes to the spindle is determined, so that the fixing position of the adapter with respect to the spindle is inevitably determined. Therefore, for example, if the adapter is fixed to the spindle, the flow paths on the open side and the closed side inevitably coincide between them, and if the spindle is attached to the rotating rod via such an adapter, the positioning bolt and the position Due to the relationship of the holes, the flow paths on the open side and the closed side coincide with each other.
Therefore, according to the present invention, the opening / closing flow path between the spindle and the rotating rod can be easily (automatically) adjusted during assembly. Further, if the positioning bolt has a different size from the other bolts, it is obvious at first glance, the confirmation at the time of assembly is easy, and no assembly error occurs.

Further, in the positioning structure of the swivel joint according to the present invention, the rotary rod having the positioning hole is inserted into the hollow shaft of the rotary drive unit so as to be detachable, and the work rod penetrating into the ground. It is characterized in that and are connected. Therefore, according to the present invention, it is not necessary to form a positioning hole for each work rod, and it is possible to deal with various work rods with one set of swivel joint and drive rod.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of a positioning structure for a swivel joint according to the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a work device portion centering on an auger 70 of the ground improvement machine 100 shown in FIG. The auger 70 is configured integrally with the lifting device 75 mounted on the reader 113, and is used as a hydraulic motor 7.
1 rotation is transmitted to the hollow shaft via the speed reducer. A drive rod 50 connecting the stirring rod 80 is fitted into the hollow shaft from below, and is attached by a stopper 48 so as not to fall off. The swivel joint 1 is provided with the stopper 4 for the drive rod 50 attached to the auger 70 in this way.
The swivel 40 is fixed on the upper end portion 51 protruding from 8, and further on the swivel joint 1.

The swivel joint 1 of this embodiment is for the stirring rod 80 equipped with the above-mentioned hydraulic actuator, is provided with an open side supply port 7 and a close side supply port 8 for supplying and discharging hydraulic oil, and The pump is connected to a hydraulic circuit (not shown) in which piping is provided. In this case, the open side supply port 7 and the close side supply port 8 are provided in the housing 2 which is a non-rotating body. Swivel joint 1
In addition to the housing 2, the spindle 3
And adapters 4 and 5.

FIG. 2 is a sectional view showing the swivel joint 1 in an assembled state. The swivel joint 1 consists of a spindle 3 in a housing 2 that penetrates vertically.
Is inserted so that it can rotate and does not come out.
That is, the spindle 3 is assembled by inserting bearings 11 and 12 from above and below in the inserted housing 2 and fixing covers 13 and 14 to the housing 2 so as to sandwich the bearings 11 and 12 from above and below.

Circular oil grooves 21 and 22 are formed on the inner peripheral surface of the housing 2 so that the open side supply port 7 and the close side supply port 8 communicate with each other. Axial flow path 2 for flowing ground improvement agents such as
3 and an open side flow passage 25 and a closed side flow passage 26 through which hydraulic oil flows. The open side flow passage 25 and the closed side flow passage 26 are eccentric flow passages formed at symmetrical positions with the axial center flow passage 23 in between. The openings on the circumferential side are respectively provided with the oil grooves 2.
It is formed at a position overlapping with Nos. 1 and 22, and when the spindle 3 rotates, each opening rotates along the oil grooves 21 and 22. That is, the open side flow passage 25 and the closed side flow passage 26 are always in communication with the open side supply port 7 or the close side supply port 8 via the oil grooves 21 and 22.

In the swivel joint 1, an upper adapter 4 and a lower adapter 5 are fixed to the upper and lower ends of a spindle 3, respectively, and a swivel 40 and a drive rod 50 are connected via the upper adapter 4 and the lower adapter 5 as shown in the figure. It is connected. As a result, a single axial flow path 23 through which cement milk or the like flows is connected from the swivel 40 via the swivel joint 1 and the drive rod 50 to the stirring rod 80 (not shown) connected to the drive rod 50. The open-side flow passage 25 and the closed-side flow passage 26 formed so as to sandwich the axial center flow passage 23 are also connected to the swivel joint 1, the drive rod 50, and the stirring rod 80.

However, at this time, if the swivel joint 1 is fixed to the drive rod 50 while being rotated by 180 degrees, the open side and the closed side are reversed between the two. Therefore, in the present embodiment, the lower adapter 5
One of the bolts for fixing the spindle to the spindle 3 has been improved so that it cannot be installed in the reverse direction. FIG. 3 is a plan view showing the lower adapter 5 when the swivel joint 1 is viewed from below. As shown in the figure, the lower adapter 5 includes a plurality of bolts 3 arranged on the same circumference.
It is fixed to the lower end of the spindle 3 by 1, 31 ... An open side flow passage 25 and a closed side flow passage 26 are also formed on the same circumference with the axial center flow passage 23 interposed therebetween. The swivel joint 1 has a flange portion 3 on the outer circumference of the lower adapter 5.
The bolt 5 is passed through and fixed to the drive rod 50 (see FIG. 2).

The upper adapter 4 has substantially the same structure (see FIG. 2) and is fixed to the upper end of the spindle 3 by a plurality of bolts 33, 33 ... Swivel 40 through bolt
Is fixed. It is preferable that the upper adapter 4 and the lower adapter 5 are originally integrated with the spindle 3, but the bearings 11 and 12 for rotatably supporting the spindle 3 are provided.
Since it is necessary to assemble the mounting covers 13 and 14, they are separate members.

Therefore, in the present embodiment, one of the bolts 31, 31 ... Which fixes the lower adapter 5 to the spindle 3 has a smaller size and is used to position the spindle 3 and the lower adapter 5. The bolt 32 is used. Furthermore, when the lower adapter 5 is fixed to the spindle 3, as shown in FIG.
2a projects from the lower adapter 5. Both the upper adapter 4 and the lower adapter 5 pass through the respective bolts 31 ... 33 so that the heads thereof do not hit the swivel 40 or the drive rod 50 when the bolts 31 ... 33 are fixed to the spindle 3. The hole is deeply counterbored so that the head can fit into it.

On the side of the lower adapter 5, however, the through hole through which the positioning bolt 32 is inserted is made shallow so that the head 32a thereof slightly protrudes from the assembly surface when tightened. On the other hand, the lower adapter 5
So that the head 32a of the positioning bolt 32 protruding from the housing can be set in the mounting surface of the drive rod 50.
2 is formed.

Therefore, in this embodiment, when the swivel joint 1 is first assembled, the positions of only the small-sized positioning bolts 32, through which the other bolts 31, 31 ... Do not pass, are determined with respect to the spindle 3 and the lower adapter 5. Therefore, the position for fixing the lower adapter 5 to the spindle 3 is also fixed. Therefore, if the lower adapter 5 is fixed to the spindle 3 with the bolts 31, ..., 32, the open side flow passage 25 and the close side flow passage 26 inevitably coincide with each other. There is no mistake in assembling with the lower adapter 5.

When the swivel joint 1 is assembled to the drive rod 50, the head 32a of the positioning bolt 32 protruding from the lower adapter 5 is aligned so as to be inserted into the positioning hole 52, and then fixed by the bolt. do it. As a result, it is possible to avoid erroneous assembly in which the open side flow passage 25 and the closed side flow passage 26 for supplying and discharging the hydraulic oil are reversed between the swivel joint 1 and the drive rod 50. When the opposite sides are aligned, the protruding head 32a of the positioning bolt 32 does not fit and rattles, and the assembly mistake is immediately noticed.
This is because the position can be corrected.

Further, the positioning bolt 32 is the other bolt 3
It is clear at first glance because different sizes (1, 3 ...) are used (large size bolts may be used), and confirmation at the time of assembly is easy and no assembly error occurs. Further, in this embodiment, since the stirring rod 80 is connected to the drive rod 50 attached to the auger 70, a set of swivel joints and drive rods can be used for working rods other than the stirring rod 80. It becomes possible to do. In this embodiment,
The connected drive rod 50 and stirring rod 80 correspond to the "rotating rod" described in the claims, and the stirring rod 80 corresponds to the "working rod" described therein. On the other hand, when the stirring rod 80 is directly attached to the auger 70 without the drive rod 50, the stirring rod 80 and the auger output shaft correspond to the “rotating rod” described in the claims.

Thus, through the swivel joint 1,
As shown in FIG. 1, the swivel 40 is connected to the drive rod 50, and the stirring rod 80 is connected to the drive rod 50 protruding downward from the auger 70. When the drive rod 50 is rotated by driving the auger 70, the stirring rod 80 and the spindle 3 of the swivel joint 1 are rotated accordingly. When cement milk or the like is caused to flow from the non-rotating swivel 40 to the rotating stirring rod 80 at a predetermined pressure, it is sprayed from the screw blade 81 at the lower end through the axial flow path 23.

The screw blades 81 of the stirring rod 80 which can be opened and closed are widened, for example, when pouring cement milk into an excavation hole to form a pillar pile and when forming a so-called bulb portion having a large diameter at the lower end portion. Therefore, when the working oil is sent from the opening side supply port 7 at a predetermined pressure in the step of forming the bulb portion, it flows from the oil groove 21 into the opening side flow passage 25 of the rotating spindle 3 to a hydraulic actuator (not shown). From the flow closing side flow passage 26 to the oil groove 22 and the closing side supply port 8
Is discharged to. The supply of such hydraulic oil opens the screw blade 81. On the other hand, if hydraulic oil is supplied in the opposite direction, the screw blade 81
Is closed.

As described above, in the positioning structure of the swivel joint according to the present embodiment, the bolt, which is an essential component of the swivel joint, is used as the positioning member, so that the counterbore and the positioning hole can be eliminated without adding another component. It was very easy to change or add processing. Normally, using a knock pin for positioning is a generally adopted method, but this requires a knock pin and hole machining as additional machining, which increases the man-hour and encloses it with a broken line as seen in FIG. It is also difficult to arrange because the space of the assembly surface that overlaps the assembled spindle 3 is small. In this respect, according to the structure of the present embodiment, by adopting the single bolt 32 as an alternative means of the knock pin, a swivel joint positioning structure that can be assembled without a problem by a simple structure change is provided. We were able to.

Although one embodiment of the positioning structure for the swivel joint has been described above, the present invention is not limited to this, and various modifications can be made without departing from the spirit of the invention. For example, in the above-described embodiment, the positioning structure related to the assembly of the swivel joint 1 and the drive rod 50 is shown, but the positioning structure similar to that of the swivel 40 can be used. Further, as long as it has an eccentric flow path, the positioning structure of the present invention is effective even if it does not have a plurality of flow paths at symmetrical positions.

[0028]

According to the present invention, among the plurality of bolts for fixing the adapter arranged on the mounting surface to the spindle, at least one bolt is a positioning bolt which allows the head to protrude from the mounting surface. Since the positioning hole into which the head of the positioning bolt is inserted is formed on the assembly surface of the rotating rod or swivel, a swivel joint positioning structure that can be correctly assembled by providing a simple structure change is provided. I was able to.

[Brief description of drawings]

FIG. 1 is a front view showing a working device portion centering on an auger that constitutes a ground improvement machine.

FIG. 2 is a sectional view of a swivel joint in an assembled state.

FIG. 3 is a plan view showing a lower adapter when the swivel joint is viewed from below.

FIG. 4 is a side view showing a ground improvement machine.

[Explanation of symbols]

1 swivel joint 2 housing 3 spindles 4 Upper adapter 5 Lower adapter 23 axial flow path 25 Open side flow path 26 Closed side flow path 31 Volts 32 Positioning bolt 40 swivel 50 drive rod 52 Positioning hole 70 augers 80 stirring rod

Claims (3)

[Claims] 1. A non-rotating body housing, a rotatable spindle inserted in the housing, and adapters fixed to both ends of the spindle with a plurality of bolts, and one or more or more of the spindles. In the positioning structure for assembling the swivel joint in which the eccentric flow path of is formed between the swivel and the rotating rod via the adapter, a plurality of bolts for fixing the adapter placed on the assembly surface to the spindle Among them, at least one bolt is a positioning bolt that allows the head to protrude from the mounting surface, and the mounting surface of the rotary rod or swivel has a positioning hole into which the head of the positioning bolt enters. Positioning structure of swivel joint characterized by being. 2. The positioning structure for a swivel joint according to claim 1, wherein the positioning bolt has a different size from other bolts. 3. The swivel joint positioning structure according to claim 1 or 2, wherein the rotary rod having the positioning hole formed therein is detachable by being inserted into a hollow shaft of a rotary drive device. Positioning structure of swivel joint, characterized in that it is connected to a work rod penetrating into the ground.