JP3678592B2 - Telescopic cylinder mounting structure in boom device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a boom device mounted on a concrete pump truck or the like.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as disclosed in JP-A-55-161727, a boom device for a concrete pump car is provided with a front-side boom that can be expanded and contracted on a base-side boom, and the base-side boom is connected to a concrete pump. The hose is connected to the end of this pipe, and the length of the hose is adjusted by manually extending and retracting the front side boom, and ready-mixed concrete is placed. The location can be changed arbitrarily.
[0003]
[Problems to be solved by the invention]
By the way, in the said structure, when expanding and contracting a front part side boom, since the dead weight of the hose supported by the front part side boom acts on a front part side boom, an operator will be forced a great labor.
For this reason, there is a type in which each end portion of the cylinder is pivotally supported in the base side boom and the tip side boom, and the front side boom can be expanded and contracted by extending and contracting the cylinder. However, with this structure, it is necessary to dispose the check valve, hydraulic piping, etc. used in the cylinder in the boom, so the cylinder must be removed from the boom when performing maintenance work on the cylinder. For this reason, there is a drawback in that the maintenance work takes a lot of time.
Therefore, the present invention provides a telescopic cylinder mounting structure in a boom device that can easily and easily perform telescopic work of the telescopic boom with a cylinder and can easily perform maintenance work on the cylinder.
[0004]
[Means for Solving the Problems]
The present invention relates to a boom device including a base boom formed by connecting a plurality of booms so as to be able to bend, and a telescopic boom connected to a front part of the base boom so as to be able to bend, and the telescopic booms are arranged inside an outer cylinder. The side of the outer cylinder of the telescopic boom or the side of the outer cylinder of the telescopic boom that is refracted and stored below the refracted base boom An opening is formed on the lower surface, and a connecting member capable of connecting a hydraulic hose or the like to the telescopic cylinder is disposed in the opening so as to protrude outward from the opening .
[0005]
Thereby, maintenance work of the telescopic cylinder can be easily performed from the outside of the telescopic boom without interfering with other booms .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, reference numeral 1 denotes a vehicle body of a concrete pump vehicle. 1 A concrete pump 3 and a hopper 4 are mounted on the rear part.
The boom device 2 comprises a base boom 5 that can be bent and a telescopic boom 6 that can be expanded and contracted, and is in a retracted position folded on the vehicle body 1 as shown in FIG. 1 during traveling, and is extended as shown in FIG. To perform the installation work.
[0007]
The base boom 5 is provided with a mounting column 8 erected on a swivel 7 that is turnable on the vehicle body 1, and a base end of the first boom 9 is pivotally supported on the upper end of the mounting column 8. The first boom 9 is raised and lowered by the first cylinder 10 provided on the support column 8. The base end of the second boom 11 is pivotally supported at the distal end of the first boom 9, and the second boom 11 is raised and lowered by a second cylinder 12 provided on the second boom 11.
[0008]
The telescopic boom 6 is pivotally supported at the tip of the second boom 11 and is undulated by a third cylinder 13 provided on the second boom 11. 4 and 5, the telescopic boom 6 is provided with an inner cylinder 15 in an outer cylinder 14 so that the inner cylinder 15 can be expanded and contracted. The inner cylinder 15 extends and contracts in the outer cylinder 14 and the inner cylinder 15. A telescopic cylinder 16 is provided. The base portion of the telescopic cylinder 16 is pivotally supported by the inner cylinder 15, and the rod 17 is pivotally supported by a pin 19 that is inserted into the boss portion 18.
[0009]
An opening 20 is formed on the lower surface of the outer cylinder 14 at a position close to the tip of the rod 17 and in the retracted position of the boom device 2, and a connecting member 21 is provided below the outer cylinder 14 in the opening 20. The connecting member 21 is fixed to the front end of the rod 17 of the telescopic cylinder 16 with a bolt 22 from its lower surface. The connection member 21 includes a check valve (not shown), and a connection port 23 for connecting a hydraulic hose or the like (not shown) is provided on a side surface below the opening 20.
Thereby, when the maintenance work of the telescopic cylinder 16 is performed, it can be easily performed from the outside of the telescopic boom 6.
[0010]
Each boom 5, 6 is provided with a transfer pipe 25 connected to the discharge pipe 24 of the concrete pump 3, and a flexible driving hose 26 is provided at the tip of the transfer pipe 25 as shown in FIG. Connected. The placement hose 26 is guided and supported by a hose guide 27 provided at the distal end of the inner cylinder 15 of the telescopic boom 6. The tip of the placing hose 26 can be easily operated by appropriately changing the height.
Reference numeral 28 denotes a securing member provided at the rear portion of the vehicle body 1 so as to fix the distal end portion of the placing hose 26 when the boom device 2 of FIG. 1 is stored.
[0011]
Hereinafter, the hose guide 27 will be described. As shown in FIGS. 6 to 9, the hose guide 27 has a substantially semicircular arc guide member 30 between a pair of left and right upper support members 29 formed in a substantially arc shape. A plurality are provided. A connecting member 31 protruding laterally is fixed to the base portion of the upper support member 29, and the connecting member 31 is fixed to a fixing member 32 fixed to the front side surface of the inner cylinder 15 with a bolt 33. .
[0012]
A pair of left and right lower support members 34 formed in a substantially arc shape are fixed to the bottom of the guide member 30, and a plurality of groove portions 35 are formed in the lower support member 34 at predetermined intervals. . A shaft portion 37 of a guide roller 36 that can support the lower surface of the placement hose 26 is pivotally supported by a nut 38 in each of the groove portions 35. When the placement hose 26 moves, the guide roller 36 rotates to cause frictional resistance. Is no longer very small. A drum-shaped guide surface 39 corresponding to the outer shape of the placement hose 26 is formed on the outer peripheral surface of the guide roller 36 to prevent the placement hose 26 from meandering left and right.
[0013]
Reference numeral 40 denotes an auxiliary roller that is pivotally supported between the upper support members 29, and prevents the placement hose 26 from being detached from the hose guide 27 by the auxiliary roller 40.
Reference numeral 41 denotes a reinforcing member for reinforcing the hose guide 27, and the reinforcing member 41 has one end fixed to the connecting member 31 and the other end fixed to the guide member 30 at the tip of the upper support member 29.
[0014]
In this embodiment, the concrete pump truck has been described. However, other aerial work platforms, cranes, and the like have the same effects. Further, although the rod portion of the telescopic cylinder is pivotally supported on the outer cylinder, the base portion of the telescopic cylinder may be pivotally supported on the outer cylinder. Moreover, although the opening is formed in the lower surface of the outer cylinder, even if it is provided on the side surface, the same effect is obtained.
[0015]
Further, in the present embodiment, the check valve is built in the connection member, but the same effect can be obtained even if the check valve is provided on the connection member protruding outward from the opening.
The present invention is constructed as described above, and the operation will be described next.
In order to perform the placing operation of ready-mixed concrete, first, the first boom 9, the second boom 11 and the telescopic boom 6 are erected from the storage position shown in FIG. 26 is placed at the placement site. When the ready-mixed concrete is put into the hopper 4 in this state and the concrete pump 3 is operated, the ready-mixed concrete is pumped from the discharge pipe 24 to the transfer pipe 25 and is supplied into the hopper 4 by the driving hose 26 at the placement site. The ready-mixed concrete is driven through the transfer pipe 25 and the driving hose 26.
[0016]
Subsequently, when performing a driving operation at a nearby driving site, the telescopic boom 6 is extended by the telescopic cylinder 16 of the telescopic boom 6 without causing the base boom 5 to move up and down, and the driving hose as shown in FIG. The tip of the placing hose 26 is moved to the placement place while appropriately changing the length of the placement 26. At this time, since the driving hose 26 moves on the guide roller 36 of the hose guide 27, the frictional resistance is small and can be smoothly guided.
[0017]
Thereafter, ready-mixed concrete is placed in the same manner as described above.
After the driving operation is finished, the telescopic boom 6 is contracted by the telescopic cylinder 16, and then the booms 6, 9, 11 are refracted by operating the hydraulic cylinders 10, 12, 13 to contract or extend, so To store.
By the way, the maintenance work is periodically performed after the placing work is completed. In the case of the expansion / contraction cylinder 16, after removing the hydraulic hose and the like connected to the connection port 23, the bolt 22 is removed and the connection member 21 is connected to the expansion / contraction cylinder 16. Remove from the bottom and perform maintenance such as check valves.
At that time, since the connection port 23 and the bolt 22 are located outside the telescopic boom 6, maintenance work can be easily performed. Further, since the opening 20 is formed on the lower surface of the outer cylinder 14 in the boom device 2 retracted position, maintenance work can be easily and easily performed without interfering with other booms.
[0018]
【The invention's effect】
According to the present invention as described above, an opening is provided a telescopic cylinder on the side surface or lower surface of the outer cylinder which is disposed therein, a connecting member may connect the hydraulic hoses or the like telescopic cylinder is in the opening opening since so disposed in a state of being more protruding to the outside, without interfering the maintenance of the telescopic cylinders or outside et another boom telescopic boom can be carried out easily.
[Brief description of the drawings]
FIG. 1 is an overall view of the present invention.
FIG. 2 is a side view when the boom device of FIG . 1 is extended .
FIG. 3 is an enlarged plan view of the boom device front part of FIG . 1 ;
FIG. 4 is a side sectional view of the telescopic boom.
5 is a principal part longitudinal cross sectional view of FIG.
FIG. 6 is a side view of a hose guide.
7 is a front view of the hose guide of FIG. 6. FIG .
FIG. 8 is an enlarged view of the guide roller of FIG.
9 is a cross-sectional view taken along the arrow in FIG.

Claims (1)

In a boom device comprising a base boom formed by connecting a plurality of booms so as to be able to bend, and a telescopic boom connected bendably to the tip of the base boom, the telescopic boom can extend and retract the inner cylinder within the outer cylinder. An opening is provided on the side or lower surface of the outer cylinder of the telescopic boom that is provided in the outer cylinder and in the inner cylinder with the ends of the telescopic cylinder for extending and retracting the inner cylinder being refracted and stored below the refracted base boom. A telescopic cylinder mounting structure in a boom device in which a connecting member capable of connecting a hydraulic hose or the like to the telescopic cylinder is provided in the opening so as to protrude outward from the opening .

Images