JP3963004B2 - Telescopic rod with chemical solution pipe interior - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a telescopic rod having a chemical solution distribution pipe interior that is used by being connected to a screw rod, a stirring rod, an excavation head, or the like.
[0002]
[Prior art]
Conventionally, this type of telescopic rod consists of a hollow outer rod and a hollow inner rod which is inserted into the outer rod so as not to rotate and to be axially expandable and contractible. The base of the flow pipe is fixed to the outer end of the outer rod in a state where the chemical flow pipe having the axial direction is inserted, the chemical flow hole is vertically passed through the inner rod, and the flow pipe is inserted into the flow hole. A structure in which a large-diameter seal portion is inserted in a liquid-tight state in an axially slidable manner is known.
[0003]
However, in the above-described conventional rod, when the large-diameter seal portion is cleaned, inspected, or replaced with a new one, or when lubricating oil is applied to the inner peripheral surface of the flow hole with which the large-diameter seal portion contacts, the inner rod There is a drawback that not only the work becomes large, but also a large work space is required.
[0004]
[Problems to be solved by the invention]
Invention of Claim 1 of this application makes it a subject to perform washing | cleaning, an inspection, exchange, etc. of a large diameter seal part, without pulling out an inner rod from an outer rod,
[0005]
In addition to the problem of the invention of claim 1, the invention of claim 2 of the present application is to apply lubricating oil to the inner peripheral surface of the flow hole with which the large-diameter seal portion contacts without pulling out the inner rod from the outer rod. .
[0006]
[Means for achieving the task]
As means for achieving the above object, the invention of claim 1 of the present application is
A hollow outer rod, and an inner side rod that is inserted into the outer rod in a non-rotatable and axially extendable manner and is detachably fixed at a plurality of desired extension / contraction positions. In the state where the chemical flow inner pipe having a large-diameter seal portion is inserted in the axial direction at the front end, the flow inner pipe base is fixed to the extensible outer end of the inner rod, and the flow hole is formed in the outer rod. In the state where the chemical solution outer pipe passed through in the axial direction is inserted in the axial direction, the flow outer tube base portion is fixed to the expansion / contraction outer end of the outer rod, and the large diameter of the flow inner tube is set in the flow hole of the flow outer tube. In the configuration where the seal part is inserted in a liquid-tight state so as to be slidable in the axial direction,
At the time of the shortest reduction of both the inner and outer rods, the large-diameter seal portion protrudes from the outer extensible end of the outer rod to the outside of the rod.
Proposal of telescopic rods with chemical liquid distribution pipe interior,
[0008]
The invention of claim 2 of the present application is
A supply path for guiding lubricating oil from the outside of the rod to the flow hole of the chemical solution flow outer pipe when the inner and outer rods are shortened the shortest at the expansion / contraction outer end of the inner rod in the first aspect of the invention. We propose a telescopic rod with a chemical distribution pipe.
Embodiments of the present invention will be described below with reference to the drawings.
[0009]
【Example】
1 and 2, the telescopic rod (1) includes a hollow outer rod (2) and a hollow inner rod (3) inserted into the outer rod so as to be telescopic, and the outer rod (2) A spline groove (4) in the generatrix direction is provided on the inner peripheral surface of the expansion / contraction inner end (upper end in FIG. 1), and a female joint (5) is provided in the expansion / contraction outer end (lower end in FIG. 1). Auxiliary female joint (6) having a socket part (7) with a square hole is detachably connected to (5) by means of cotter pins (8) and (8). In the state which inserted the chemical | medical solution distribution outer pipe | tube (9) longitudinally passed through (10) in the axial direction, the holding | maintenance member (11) connects the base part of a distribution outer pipe (9) to the expansion-contraction outer end part of an outer rod (2). It is fixed.
[0010]
The other inner rod (3) has, on its outer peripheral surface, a spline protrusion (12) that engages with the spline groove (4). ) Is provided with a male joint (13) comprising an angular plug that can be engaged with and disengaged from the socket (7), and a through hole (15) is vertically passed through the inner rod (3). The base of the flow inner pipe (14) is fixed to the extensible outer end of the inner rod (3) with the chemical flow inner pipe (14) having a large-diameter seal (16) at the tip inserted in the axial direction. It is.
[0011]
The inner rod (3) is inserted into the outer rod (2) as described above, and the spline protrusion (12) is engaged with the spline groove (4) so that it cannot be rotated and is axially extendable and retractable. The flow inner pipe (14) is inserted into the flow hole (10) of the flow outer pipe (9) from the large diameter seal portion (16), and the large diameter seal portion (16) is inserted into the flow hole (10). It is inserted in the liquid-tight state so as to be slidable in the axial direction.
[0012]
The means for fixing the inner and outer rods (3) and (2) to the desired expansion / contraction length is provided in the expansion / contraction inner ends of the inner and outer rods (3) and (2) at the time of the longest extension in this example. The cotter pins (19) and (19) are press-fitted into the pin holes (17), (17), (18) and (18) having a semicircular cross section, and the pin holes ( 17 ′) and (17 ′) are provided, and the cotter pins (19) and (19) are replaced with matching holes between the pin holes (17 ′) and (17 ′) and the pin holes (18) and (18). It can be fixed to the reduced length.
[0013]
When the inner and outer rods (3) and (2) are extended to the longest length, the inner diameter pipe (14) is inserted into the outer diameter pipe (9) as shown in FIG. 1 (A). When the inner and outer rods (3) and (2) are reduced to the shortest reduction length shorter than the reduction length, the large-diameter seal portion (16) is shown in FIG. Thus, the length is such that most of the outer pipe (9) is exposed.
[0014]
Further, when the inner and outer rods (3) and (2) are contracted the shortest, the flow outer pipe (9) has its tip at the base (21) of the male joint (13) as shown in FIG. The length is such that it moves to a position close to the inner end face.
(20) and (20) are removable inspection plugs that also serve as stoppers when the inner rod (3) is reduced.
[0015]
The oil supply passage for supplying oil to the inner peripheral surface of the flow outer pipe (9) on which the large-diameter seal portion (16) slides is as follows. In the male joint (13) base (21) of the inner rod (3), as shown in FIG. 2, an L-shaped oil supply through hole (22) that opens from the outside of the rod to the inside of the rod hollow is formed. 22) One end of a short oil supply hose (23) is connected to the opening into the hollow inside of the rod, and the other end of the hose is suspended close to the outer peripheral surface of the flow inner pipe (14). When the inner and outer rods (3) and (2) are shortened as shortest as possible, the drooping tip is opened at a position close to the upper end of the flow outer pipe (9), and the rod of the oil supply through hole (22). A plug (24) or a grease nipple is attached to the opening to the outside.
[0016]
When cleaning the large-diameter seal portion (16), the cotter pins (8) and (8) in FIG. 1 (A) are removed to separate the auxiliary joint (6) from the outer rod (2), and then the cotter pin. Remove (19), (19), then remove the stopper and inspection plug (20), (20) and push the inner rod (3) into the outer rod (2) to reduce it to the shortest, thereby As shown in FIG. 5C, the large-diameter seal portion (16) is projected from the lower ends of the flow outer pipe (9) and the outer rod (2) , and water is sprayed onto the large-diameter seal portion (16) in this state. Wash.
[0017]
When refueling, in the shortest contracted state, the plug (24) of the oil supply through hole (22) is pulled out, and the lubricating oil is gradually press-fitted from the opening of the oil supply through hole (22). The lubricating oil flows through the oil supply hose (23) and flows into the gap between the flow outer pipe (9) and the flow inner pipe (14), and gradually flows to the large-diameter seal portion (16) at the lower end.
[0018]
In another embodiment shown in FIG. 3, the flow outer pipe (9a) is inserted into the inner rod (3a) and its base is fixed to the extensible outer end of the inner rod (3a). Is inserted through a flow inner pipe (14a) having a large-diameter seal portion (16a) at the tip and the base portion is fixed to the extensible outer end portion of the outer rod (2a), and the large-diameter seal portion (16a) is It is slidably inserted into the flow hole (10a) of the flow outer pipe (9a), and the large-diameter seal portion (16a) protrudes from the expansion / contraction outer end of the inner rod (3a) when the inner and outer rods are shortened as short as possible. The other structure is substantially the same as FIGS.
[0019]
In FIG. 3, the female joint (5a) of the outer rod (2a) is formed with a square hole socket portion (7a) that can be engaged with and disengaged from the male joint (13a) of the inner rod (3a), and the auxiliary joint is excluded. It is.
[0020]
The female joint (5) in the example of FIG. 1 may be formed with a square hole socket portion that is detachable from the male joint (13) in the same manner as described above, and the auxiliary joint (6) may be omitted.
[0022]
【The invention's effect】
According to the invention of claim 1 of the present application, without removing the inner rod from the outer rod, the inner and outer rods are shortened to the shortest so that the large-diameter seal portion protrudes from the rod, and the large-diameter seal portion is cleaned. Work such as inspection and replacement with a new one can be performed easily and quickly.
[0023]
According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, the large-diameter seal portion slides from the outside through the oil supply passage into the flow hole without pulling out the inner rod from the outer rod. Lubricating oil can be provided, and the lubrication work can be facilitated and streamlined.
[Brief description of the drawings]
FIG. 1A is a partially omitted longitudinal sectional view.
(B) It is a BB line expanded sectional view of the above-mentioned (A) figure.
(C) It is a partially abbreviated longitudinal sectional view of the shortest reduced state.
FIG. 2 is an enlarged view of an oil supply passage portion in FIG.
FIG. 3 is a partially omitted schematic line longitudinal sectional view of another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 1a Telescopic rod 2, 2a Outer rod 3, 3a Inner rod 9, 9a Chemical solution outer pipe 10, 10a, 15, 15a Flow hole 14, 14a Chemical solution inner pipe 16, 16a Large diameter seal part 22 Oil supply hole 23 Oil hose

Claims (2)

A hollow outer rod made empty inner rod in which is detachably fixed to a plurality of desired stretch position while being inserted non-rotatably and axially retractably within outer rod, in the inner rod, distributing holes In the state where the chemical flow inner pipe having a large-diameter seal portion is inserted in the axial direction at the front end, the flow inner pipe base is fixed to the extensible outer end of the inner rod, and the flow hole is formed in the outer rod. In the state where the chemical solution outer pipe passed through in the axial direction is inserted in the axial direction, the flow outer tube base portion is fixed to the expansion / contraction outer end of the outer rod, and the large diameter of the flow inner tube is set in the flow hole of the flow outer tube. In the configuration where the seal part is inserted in a liquid-tight state so as to be slidable in the axial direction,
At the time of the shortest reduction of both the inner and outer rods, the large-diameter seal portion protrudes from the outer extensible end of the outer rod to the outside of the rod.
Telescopic rod with chemical solution pipe interior.   The supply path for guiding lubricating oil from the outside of the rod into the flow hole of the chemical solution outer pipe when the inner and outer rods are shortened the shortest is provided at the expansion / contraction outer end of the inner rod. The telescopic rod with the chemical solution distribution tube inside described.

Images