JPS6235755Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an auger rod joint used in an auger excavator that excavates earth vertically, horizontally, or at a free angle.

Due to its structure, auger rods have auger blades on the outer periphery of the rod, and when connecting auger rod sections, the joints of the auger blades are usually matched to ensure smooth communication, and they are connected in the same direction. During excavation work using an auger rod, if the rod becomes trapped due to collapse of the excavated layer, etc., it is necessary to pull the rod and violently rotate it forward and backward to release it from the trapped area. do. Therefore, the threaded joint method used in many general boring rods is unsuitable for use in augerrod joints because the screw returns and comes off when the rod rotates in the opposite direction.

Therefore, various types of joints have been used for connecting auger rods. For example, a bolt tightening method with a flange with an engaging clutch, or one end with a square or hexagonal shaft and the other end with a square or hexagonal hole, the torque is applied by connecting these, and a headed pin etc. is attached to the joint part to prevent it from coming off. In order to drive the pin in the right angle direction and to prevent the pin from coming off, methods are used, such as using the tip of the pin as a screw and tightening it with a nut, or using a stopper with a combination of a ball or a notch and a spring.

Conventionally, the connection of auger rods requires a joint that can withstand intense forward and reverse rotation of the auger rod in accordance with the directional position of the auger blade, and the method shown in the example above has been adopted, but in actual digging using an auger rod, In drilling operations, according to the conventional joint method, the time required for connecting and disconnecting the auger rod occupies a very large proportion of the total drilling operation time.

Therefore, it is strongly desired to shorten this time. In other words, in order to save time, it is desirable to be able to connect and disconnect the auger rod with a single touch. Furthermore, as a recent trend, the automation of excavation mechanisms is progressing in order to save labor, and for this reason, the above-mentioned method is desperately needed.

The present invention eliminates the above-mentioned drawbacks and makes it possible to easily connect and remove the auger rod. The rear end is machined to have a retaining collar and a receiving hole for setting a coil spring, and connecting pins are inserted on the left and right sides, and a coil spring is set between both connecting pins. At the point, the connection of the augerrod,
Each removal operation can be easily performed with a single touch.

Conventionally, augerrod joints with almost the same configuration as above but with one connecting pin on one side have been used, for example, the utility model registration patent owned by the applicant.
No. 1320547 and Utility Model Publication No. 54-7608, but in this case, while digging with this rod, the pressure of cutting chips is applied to the tip of the connecting pin, which causes the connecting pin to be pushed inward and engage with the box joint. comes off,
There have been two or three times where I have had trouble leaving the rod in the hole.

In order to prevent the occurrence of such troubles, the present invention is characterized in that the connecting pins are oriented in the left-right direction, resulting in a total of two connecting pins. In other words, this is because, considering the probability, it is impossible for two connecting pins to be pushed in at the same time by the heavy pressure of excavation debris, and if one of the two connecting pins were to be pushed in at the same time, 2
The coil spring set between the connecting pins of the book is compressed by that much, and the force pushing the connecting pins outward becomes that much stronger.
A fully engaged side connecting pin provides a synergistic effect that further increases the resistance to external pressure.

This joint system can also be used for general boring rods other than auger rods, and is particularly suitable as a boring rod joint for heavy excavation work that requires transmission of large torque. Traditionally, the taper screw method has been mainly used for boring rod joints for heavy excavation work. This tapered screw type joint has the disadvantage that it can become tightly tightened depending on how large or small the screw is tightened, and requires a large amount of torque and time to unscrew when removing the joint.

As shown in the first diagram in the figure, which is an embodiment of the present invention,
One of the auger rods 2 having an auger blade 1 has a bit 3 attached to its tip, and these are connected by joints 4, as will be described later. FIGS. 2 and 6 are longitudinal sectional views showing the state of connection and coupling of the augeroid joint part 4,
FIGS. 3 and 5 are longitudinal and transverse cross-sectional views showing the process of disconnection or connection for removal of the augerrod joint.

2, 4 and 7, a square pin joint 6 is inserted into a box joint 5 having a square hole 5' so that the joint 7 of the auger blade 1 is aligned with the box joint 5. The box joint 5 is provided with a hole 8 drilled in the axial direction at its axial center for passing pressurized fluid such as air or water, and a pin insertion hole 9 drilled in the direction perpendicular to the hole 8, that is, in both directions. The connecting pin hole 9' provided in the connecting pin hole 9' has a curved tip end surface, and the connecting pin 1 has a receiving hole 12 for setting a retaining collar 10 and a coil spring 11 in the rear insertion hole 9.
In order to limit the amount of inward and outward protrusion of the pin joint 6, a snap spring 14 is mounted on the inner center of the pin joint 6, and a nut 15 is screwed into each side of the pin joint 6, so that the retaining collar 10 of the connecting pin 13 becomes a stopper. to play the role of

The joint part 4 as described above has a pin at the end of the auger rod 2, and the joint 6 has a round shaft shape at its tip 16 and base 17, and the square part and the box joint 5 of the other auger rod 2 form a round shaft. The hole portions are adapted to fit together. That is, the square rod 6 is fitted into the square hole 5'. Tip 16 of pin joint 6
An O-link groove 0' is machined in the nut 15, and O-rings 18 and 19 are fitted in each to prevent the pressure fluid passing through the joint from leaking to the outside.
Figures 3 and 5 show the connecting pin 13 of the joint.
Indicates that it is removed. That is, two connecting pins 1
3 shows a state in which the coil spring 11 is compressed and the curved tips of the connecting pins 13 are brought into contact with the inner surfaces of the square holes 5' of the box joints 5.

In the case of connecting an auger rod joint, this invention can be connected to the square hole on the box joint 5 side by simply aligning the position of the auger blade in the next position and pushing the pin joint 6 into the box joint 5 side. The rectangular part of the pin joint 6 is inserted into the pin joint 6, and the connecting pin 1 is automatically connected to the pin joint 6.
3 are fitted into the holes 9 of the box joints 5, respectively, so that the connection is completed mechanically very strongly and quickly and easily.

On the other hand, when removing the auger rod, the auger rod is slightly pulled and the tips of both connecting pins 13 are pushed in with a special pliers-type tool, and the connecting pins 13 are disengaged and the removal is completed.

As described in detail above, the present invention has an extremely simple structure and has excellent practical effects in that the auger rod can be easily and safely connected and removed quickly and easily.

[Brief explanation of the drawing]

Fig. 1 is an assembly diagram showing a state in which the present invention is implemented and a bit is attached to an auger rod; Fig. 2;
Figure 3 is a detailed longitudinal cross-sectional view of the joint, Figures 4 and 5 are cross-sectional views of the joint connecting pin, Figure 6 is an enlarged view of the vertical cross-section showing the joint situation, and Figure 7 is a detailed longitudinal cross-sectional view of the joint. It is an enlarged view of FIG. 4. In the figure, 1 is the auger blade, 2 is the auger rod, 3 is the bit, 4 is the joint, 5 is the box joint, 6 is the square pin joint, 7 is the joint of the blade 1, 8 is the ventilation hole, and 9 is the connecting pin. hole, 10 is a stopper, 11 is a coil spring, 12 is a coil spring receiving hole, 13 is a connecting pin, 14 is a snap ring, 15 is a nut,
16 is the tip of the pin joint, 17 is the base, 1
8 and 19 are O-rings.

Claims (1)

[Scope of utility model registration request] In an auger-rod joint configured such that a pin joint having a square joint portion fits into a box joint having a square hole for the joint, a pressure fluid hole is provided in the axial center of the pin joint, and pressure fluid holes are provided in both sides of the joint. A pin insertion hole is provided at right angles to the box joint, and a connecting pin hole is provided on both sides of the box joint, into which a coil spring is inserted, and each tip is machined into a curved surface on both sides.
An augerrod joint in which both connecting pins with a retaining collar and a coil spring receiving hole at the rear end are inserted through the insertion hole, a snap spring is fitted in the center of the pin, and nuts are screwed into both ends.