JPH0314988B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an excavator equipped with a drilling rod tool such as a drilling rod, a stirring rod, or an auger screw. This invention relates to a rod holder device for holding an adding rod.

Conventionally, in an excavator in which a drilling rod is removably connected to the output shaft of a drive unit that is supported on a mast so that it can be raised and lowered, an arm is rotatably supported on a horizontal plane on the mast, and is connected to a holder attached to the arm. A replenishing rod holder device is known in which the replenishing rod is held vertically and the arm is rotated to move the refill rod to a connection position directly below the output shaft of the drive unit. However, in this conventional device, in order to fit the upper end of the replenishing rod to the output shaft of the drive unit, the drive unit is raised and lowered by a wire winch operation.
This may cause the rod to collide with the heavy drive part and output shaft rod, or be connected with the heavy weight of the drive part added to the rod, which may cause distortion in the holder, arm, etc., and when the arm rotates. There were drawbacks such as not being able to accurately move the replenishing rod to the connection position, and sometimes damaging the holder and the like.

The first invention of the present application provides a holder device for a replenishing rod tool that eliminates the drawbacks of the conventional method and can connect the refill rod tool and the output shaft of the drive unit without applying impact or load to the holder device. Its feature is that the rod tool holder that holds the replenishing rod tool is made vertically movable, so that the rod tool can be moved up and down.

The second invention of the present application, in addition to the object of the first invention,
It is an object of the present invention to provide a holder device for a refilling rod that can hold a plurality of refilling rods and sequentially move the rods to a connecting position.
In addition to the features of the first invention, the feature is that the rod holder is rotatable. An example of the present invention applied to a replenishing rod holder device for an excavator equipped with a drilling rod will be described below with reference to the drawings.

For convenience, an example of the second invention of the present application will be described first. In FIG. 1, a mast 2 attached to the front end of a crawler 1 is vertically erected, and a drive unit 4 including a motor and a speed reducer can be moved up and down on guide rails 3 provided along the front side of the mast 1. The drive section 4 is suspended by a wire 6 drawn down from the top sheave 5, and an additional rod holder device A is attached to one side of the mast 1. Reference numeral 7 denotes a female joint that is connected in advance to the output shaft protruding from the lower end surface of the drive section 4.

The configuration of the holder device A will be explained next. Second,
In FIG. 3, bearings 8 and 9 are provided on one side of the mast 2 at vertical positions, and one end of an arm 10 consisting of a hollow body with a rectangular cross section is connected to shafts 11 and 1 on both bearings 8 and 9.
The arm 1 is rotatably supported on a horizontal plane by the arm 2.
A rod holder 13 is connected to the lower surface of the free end of the rod.

The rod holder 13 is as follows. A guide shaft 15 made of a hollow rectangular tube with a square cross section is rotatably connected to a bearing tube 14 protruding from the lower surface of the tip of the arm 10 via a bearing 16. The holder elevating shaft 17 is fitted with an upper elevating shaft 17a fitted onto the guide shaft 15, and a flange joint 19 connected to the lower end of the shaft 17a via a partition plate 18. It consists of a lower elevating shaft 17b concentrically connected, disc-shaped rod holding plates 20, 21 having a plurality of rod-holding holes 22 at its upper end and middle part, and a disc-shaped receiving plate at its lower end. 23 are each mounted concentrically and horizontally.
24 are guide rollers, two of which are attached to each side of the square tube of the upper lifting shaft 17a, and are in contact with the outer surface of the guide shaft 15.

The replenishing rod R in this example has a hollow shaft a with a male joint c protruding from the upper end via a flange b and a female joint d at the lower end, as shown in the fourth figure.

Rod holding holes 2 of the rod holding plates 20 and 21
2... is a c-shaped hole that opens in the radial direction at the periphery of the retaining plate as shown in the second figure, and the opening width is slightly wider than the diameter of the hollow shaft a of the supplementary rod R, and the retaining hole The inner diameter of the rod R is made smaller than the outer diameter of the flange b of the rod R, and the holding holes 22...
Four rods are provided at equal intervals on the same circular arc centered at , and the top surface of the uppermost retaining plate 20 has an inner diameter slightly larger than the outer diameter of the flange b of the rod R. Holding cylinders 25 having a c-shaped cross section and opening at the periphery are provided in a protruding manner concentrically with each holding hole 22, and the opening width of each holding cylinder 25 is formed to be slightly narrower than the outer diameter of the flange b of the rod R. At the same time, three rollers 26 for rotatably holding the rod are provided inside each holding cylinder 25.

The distance between the upper surface of the uppermost rod holding plate 20 and the upper surface of the lowermost receiving plate 23 is approximately equal to the length from the lower surface of the flange b of the addition rod R to the lower end of the rod.

The vertical drive device for the rod holder 13 is as follows. A connecting rod 27 is inserted into the guide shaft 15, the lower end of the connecting rod projects from the lower end of the guide shaft 15, and is rotatably connected to the partition plate 18 via a bearing 28 with a nut 29, and the upper end of the connecting rod The chain 30 is connected to the arm 1, while the arm 1
A hydraulic cylinder 3 is installed as a driving means in a cylindrical housing 31 that is connected to the lower surface of the base and extends appropriately downward.
2 is supported vertically, a sprocket 34 is attached to the tip of the ram 33 of the cylinder, and the chain 3
0 into the hollow of the arm 10 through the bearing cylinder 14, and then the sprockets 35, 3 inside the arm 10.
The other end of the chain 30 is connected to an adjustment pin 37 attached to the upper surface of the arm 10 with a nut 38. Therefore, when the sprocket 34 is moved up and down by driving the cylinder 32 forward and backward, the connecting rod 27 is moved up and down via the chain 30, and thereby the holder lifting shaft 17 is moved up and down.

The swing drive device for the arm 10 is provided by a bracket 3 protruding from the rear surface of the mast 2 as shown in the second figure.
9, one end of a hydraulic cylinder 40 is rotatably supported, and a ram 41 of the cylinder is connected to a bracket 42 protruding from the base of the arm 10.

The operation of this device will be explained next. The arm 10 is normally placed at a standby position P on the side of the mast 2, and there, the replenishing rod R is attached to the receiving plate 23 at its lower end.
With the hollow shaft a... placed on the retaining plate 20,
21, and the flanges b are fitted into and held in the holding cylinders 25 of the holding cylinders 22. In FIG. 1, when the leading rod R' is inserted into the ground, the connection between the leading rod and the output shaft of the drive section is cut off, and the driving section 4 is raised to the top of the mast 2, and in this state, the hydraulic cylinder 40 The arm 10 is rotated forward of the mast by the drive of the rod retaining holes 2 in the rod retaining plates 20 and 21.
The rotation orbit S centered on the guide shaft 15 of No. 2 is located directly below the drive unit output shaft, that is, at the connection position Q. Next, move the entire rod holder 13 into the bearing sleeve 14.
Then, the connecting rod 27 is manually rotated by an appropriate angle to place one of the holding rods R at the connection position Q. Then the hydraulic cylinder 32
The rod holder 13 is raised by appropriately pulling up the connecting rod 27 via the chain 30, and the male joint c at the upper end of the one addition rod R is fitted and connected to the joint 7 of the output shaft. next,
When the rod holder 13 is lowered by driving the cylinder 32, the flange b of the rod R connected to the drive unit output shaft escapes upward from the holding cylinder 25 (as shown by the chain line in Figure 3), and can be removed from the holding hole 22. becomes. Therefore, when the arm 10 is turned to the side of the mast by driving the cylinder 40, the rod holder 13 returns to the standby position P, leaving the rod R. Next, the wire 6 is loosened to lower the drive unit 4 and the rod R, and the female joint d at the lower end of the rod is connected to the male joint c' at the upper end of the preceding rod R'.

As an embodiment of the first invention of the present application, except for the bearings 16 and 28 in the above example, the upper end of the guide shaft 15 is fixed to the lower part of the arm 10 in a non-rotatable manner, and each rod holding plate 20 and 21 has a connection position Q when the arm pivots. A holder device for a replenishing rod tool in an excavator is obtained, which is provided with a rod holding hole 22 and a holding cylinder 25, respectively, which are to be located in the same position, and whose other construction is substantially the same as in FIGS. 1, 2, and 3.

According to the holder device for a replenishing rod in an excavator according to the first invention of the present application, when the replenishing rod is connected to the drive unit output shaft at the connection position, the rod holder is raised to output the upper end of the rod. Since it can be brought into contact with the shaft, it is possible to avoid the inconveniences of conventional devices, such as colliding the heavy drive part with the rod tool, or connecting the rod tool with the heavy weight of the drive part added to the rod tool. This makes it possible to maintain overall accuracy and improve durability.

According to the holder device of the second invention of the present application, in addition to the effects of the first invention, the rod tool holder holds a plurality of rod tools, and the rod tools are sequentially supplied to the connection position with the output shaft by rotation of the rod tool holder. This eliminates the need to replenish the rod tool holder with additional rod tools, making work more efficient.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view of an excavator, FIG. 2 is an enlarged sectional view taken along the line - in FIG. 1, and FIG. 3 is a partially omitted sectional view taken along the line - in FIG. 2.
FIG. 4 is a partially omitted enlarged front view of the replenishing rod. 2... Mast, 4... Drive unit, 10... Arm, 13... Rod holder, 15... Guide shaft,
27...Connecting rod, 30...Chain, 32...Hydraulic cylinder, R...Additional rod.

Claims (1)

[Scope of Claims] 1. An excavator having a vertically erected mast, a drive section supported by the mast so as to be able to rise and fall, and an excavation rod that is removably connected to and hangs from the output shaft of the drive section. , An arm is supported on the mast so as to be freely pivotable in a horizontal plane, and a rod tool holder, which is to hold a replenishing rod tool vertically and removably, is moved up and down on a guide shaft vertically connected to the tip of the arm. A holder device for a replenishing rod tool in an excavator, which is equipped with a drive device that freely supports the rod tool holder and drives the rod tool holder up and down. 2. In an excavator that has a vertically erected mast, a drive part supported by the mast so as to be able to rise and fall, and a drilling rod that is removably connected to and hangs from the output shaft of the drive part, an arm is attached to the mast. It should be supported rotatably on a horizontal plane, a guide shaft should be rotatably connected to the tip of the arm with the guide shaft facing vertically, and a plurality of replenishment rods should be detachably held vertically on the guide shaft. While supporting the rod tool holder so that it can move up and down,
A holder for a replenishing rod in an excavator, which holds the plurality of replenishing rods on the same circular arc centered on the guide shaft, and is equipped with a drive device that drives the rod holder up and down. Device.