JPS63315495A - Telescopic arm device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a telescopic arm device connected to a boom of a hydraulic excavator, etc., and in particular, a push-in and pull-out device is provided between the inner and outer arm members that are telescopically fitted. The system's wire rope is stretched, and a common hydraulic cylinder applies driving force to the wire rope in both the extension and contraction directions, and the telescoping arm is slidably supported on a hollow cylindrical support member. This invention relates to a telescopic arm device which allows the outer arm itself to move forward and backward.

[Problem that the invention seeks to solve]

There are various types of hydraulic excavators that are capable of excavating deep layers by attaching a Talamusiel packet or the like to the tip of a retractable arm in which an outer arm, an intermediate arm, and an inner arm are connected in a telescopic manner. First, in the type where the wire rope attached to the lowest arm is operated by a drum installed at the upper end of the uppermost arm, the downward pressing force against the packet attachment at the lower end depends only on the arm's own weight, so there is insufficient digging pressure. Not only is it not possible to dig sufficiently, but the arm approaches the horizontal position (and cannot be extended, making it extremely inefficient).

Next, a system that applies a forward pressing force to the packet by extending a telescoping hydraulic cylinder in the axial direction of the telescoping arm and connecting the lowermost arm to the tip of the cylinder rod is a cylinder. Since the cylinder is built into the cylindrical body of the telescoping arm, maintenance is difficult.Also, since the cylinder is long and is directly connected to the packet support arm, it is easily twisted and damaged during work, and the cost is high. There were drawbacks.

In order to solve these problems, the applicant first stretched a wire rope for pushing and pulling up between a plurality of arm members that were telescopically fitted on the inside and outside, and connected this wire rope to an integrated pulley. He developed a telescopic arm that could forcibly drive the telescopic arm in both the extension and contraction directions by pulling it with the rod of a hydraulic cylinder, and filed a patent application in 1987 as Patent Application No. 187354.

This method can apply a strong pressing force to the tip of the arm when extending the arm, resulting in good excavation efficiency.It can also be extended horizontally or upwards, making it easy to load excavated earth and sand into vehicles. It is also convenient and does not require a long cylinder, and has received various excellent reviews. However, as with the conventional type, the outermost arm of this type is fixed to the boom of the earthmoving machine body, so the entire arm cannot be moved rearward when it is extended or retracted.

Therefore, when the arm is leveled to dig up earth and sand and load it onto a vehicle, the center of gravity is far from the boom fulcrum, resulting in poor balance and the risk of applying excessive force, as well as increasing the working radius for loading the vehicle. The present invention has been made to solve the above problems, and its purpose is to be able to apply a forced downward pressing force to the tip of the arm when it is extended, that is, when digging, and to apply a forced downward pressure to the tip of the arm when it is extended, that is, when digging, and to apply a forced downward pressing force to the tip of the arm when it is extended, that is, when digging, and to apply a forced downward pressure to the tip of the arm when it is extended, that is, when digging. The object of the present invention is to provide a telescopic arm that can move the center of gravity by sliding it rearward, and can also reduce the working radius during loading.

[Means for solving problems]

The above-mentioned object of the present invention is to provide an outer arm in which a hydraulic cylinder is fixed in the axial direction of a hollow cylindrical body having an upper pulley and a lower pulley attached thereto, a pulley on the pulling side and a pulley on the pushing side are attached to the tip of the cylinder rod, An intermediate arm having an upper pulley 13a attached to one side of the cylinder and a lower pulley 13b attached to the other side and an inner arm having an attachment attached to its tip are telescopically fitted inside and out, and one wire system is fixed to the inner arm. One of the wire ropes is wound sequentially from the lower pulley to the upper pulley of the intermediate arm, and then wound around the lower pulley of the outer arm and one of the pulleys of the hydraulic cylinder, and its tip is fixed to the bracket of the outer arm. A slit or a support member provided with an opening, the telescopic arm main body is fitted into the support member so that the hydraulic cylinder of the outer arm can move forward and backward with the hydraulic cylinder of the outer arm facing the opening of the support member, and the rod tip of the hydraulic cylinder This can be achieved by a telescopic arm device integrally connected near the rear end of the support member.

[Embodiments of the invention]

Embodiments of the present invention will be described below based on the drawings. In the figure, reference numeral 1 denotes a slit or opening 1c elongated in the axial direction of a hollow frame body 1b on which a bracket 1a for connecting a boom A and an operating hydraulic cylinder B of an earth-moving machine such as a hydraulic excavator (not shown) is integrally fixed. This is a support member that penetrates the hollow interior and supports the telescopic arm main body 2 so that it can move forward and backward. Reference numeral 2 denotes a telescopic arm main body that is slidably held by penetrating the inside of the support member 1, and this telescopic arm main body 2 is able to slide into and out of the outer arm 3, intermediate arm 4, and inner arm 5, respectively. The outer arm 3 consists of a hollow cylindrical body with an upper pulley 6a attached to the rear end bracket and a lower pulley 6b attached to the outer tip bracket, and a hydraulic cylinder 7 attached to the outside near the middle. It is integrally fixed along the direction. Further, two sets of pulleys 9a and 9b for pushing and pulling are pivotally attached to the tip of the piston rod 8 of the cylinder 7. In the illustrated embodiment, a double-rod hydraulic cylinder in which the tips of a series of piston rods protrude from both ends is used, and a pulling pulley 9 is provided at the end of the rear piston rod 8ai.
a, and a pushing pulley 9b is provided at the tip of the front piston rod 8b, but the present invention is not limited to this structure, and the present invention is not limited to this structure. Of course, it is also possible to mount the pair of pulleys 9a, 9b coaxially. Note that guide pulleys 10a and 10 are installed at both ends of the outer arm as necessary as shown in the figure.
b may be provided. The outer arm 3 is fitted into the support member I such that the fixing member II of the cylinder 7 protrudes from the opening 1c of the support member 1, and the outer arm 3 is supported so as to be movable forward and backward relative to the support member 1. The distal end neck portion of the rear cylinder rod 8a is fixed to the rear part of the support member 1 via a fixing bracket 12. That is, the cylinder rod 8a is fixed to the support member 1, and the cylinder 7 and the outer arm 3 integral therewith are held slidably relative to the support member 1.

The intermediate arm 4 is comprised of an intermediate cylinder having an upper pulley 13a at its rear end and a lower pulley 13b at its tip, and is fitted into the outer arm 3 so as to be slidable and telescopic. Moreover, the innermost arm 5 has a bracket 5' for attaching an attachment 14 such as an excavation bucket to the tip.
One end of a wire rope 15a for pulling and a wire rope 15b for pushing are fixed to the middle, preferably at the rear, and the wire rope 15a for pulling is attached to the upper pulley 6a of the outer arm 3 (if necessary, the guide boo 910a
) and the pulling pulley 9a of the hydraulic cylinder 7, and its tip is fixed to the rear bracket of the outer arm 3. On the other hand, the pushing wire rope 15b whose one end is fixed to the inner arm 5 is connected to the lower pulley 13b of the intermediate arm 4.
from there to the upper pulley 13a, and then the lower pulley 6b of the outer arm 3 (via the guide pulley 10b if necessary)
It is.

In addition, the upper pulley 6a of the outer arm 3 and the pulling pulley 9a
, the lower pulley 6b, and the pushing pulley 9b are arranged in parallel according to the length of the arm when it is extended (the length of the wire), and each wire is hung in a plurality of strips.

Note that 16a has one end fixed to the rear end 17 of the inner arm 5,
The pull-up tuning wire 16b is wound around the pull-up tuning pulley 18a at the tip of the intermediate arm 2, and the other end 16a' is fixed to the outer arm 3. One end of the pull-up tuning wire 16b is fixed to the rear end 17 of the inner arm 5, and the other end 16a' is fixed to the rear end 17 of the inner arm 5. Push synchronized pulley 18b
This is a push-in tuning wire whose other end 16b' is fixed to the outer arm 3 by wrapping it around the tuning pulley 19 of the outer arm 3.

Next, the present invention will be explained in detail.

FIG. 1 shows the telescopic arm device of the present invention in a state in which it is shortened and pivoted in the horizontal direction. To excavate by extending the arm from this state, the arm is set vertically as shown in FIG. Since it is partially fixed at 1, the cylinder 7 and the outer arm 3 integrated therewith are forcibly pushed forward. As a result, the pushing pulley 9b of the cylinder and the lower pulley 6b of the outer arm 3 gradually separate, and the intermediate arm 4 and inner arm 5 are also forced forward in order to push between the pulleys 6b and 9b and wind up the wire rope 15b. The tip of the arm is pushed out and slides into a strong position, and the tip of the arm is in its longest extended state. Next, when the packet is pulled up (to compress the arm, hydraulic pressure is supplied to the pulling boat 7a of the cylinder 7, and the outer arm 3 is pulled up together with the cylinder 7 from the position shown in Fig. 3 to the position shown in Fig. 1, and at the same time, the cylinder Since the pulling pulley 9 of 7 is wound up, the intermediate arm 4 and the inner arm 5 also slide upward.Thus, the telescopic arm main body 2 is shortened to the shortest possible length, but in this state, the outer arm 3 itself is at the rearmost position with respect to the support member 1. As a result, the center of gravity of the arm body 2 and the packet load, and the position of the arm tip are moved rearward by that amount.

〔Effect of the invention〕

As described above, the telescopic arm device of the present invention can apply forced pushing pressure when the arm is extended, so it can excavate a large amount at one time, and it is easy to excavate hard earth and sand. Since it has a structure that moves forward and backward relative to the member, when it is extended, the entire length of the arm can be used for deep digging, and when it is shortened, the entire arm is pulled back and the center of gravity moves backward, improving load balance. . This means that no undue force is applied to the arm or the civil engineering machine body, so a larger excavation packet can be used.Furthermore, when the arm is shortened, the boom connection position and the arm tip position are Since the backward movement stroke of the boom is shortened, the width of the boom's vertical movement when loading and unloading packets etc. into and out of the excavation hole is small, and the working radius for loading earth and sand into the vehicle is reduced, significantly improving work efficiency. However, it also has excellent advantages such as being able to narrow the area where soil and sand are scattered.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a telescopic arm device according to an embodiment of the present invention when it is shortened; FIG. 2 is a partial plan view of FIG. 1;
Figure 3 shows the vertical section of the farm body when the arm is extended, 3...
Outer arm, 4... Middle arm, 5... Inner arm, 6a... Upper pulley, 6b... Lower pulley, 7...
Hydraulic cylinder, 9a, 9b... Pulley, 12... Fixing bracket, 13a... Upper pulley, 13b... Lower pulley, 14... Attachment, 15a... Pulling wire rope, 15b... push wire rope,
16a... Pulling tuning wire, 16b... Pushing tuning wire, 18a... Pulling tuning pulley, 18b
...push synchronized pulley,

Claims (1)

[Claims] A hydraulic cylinder 7 is fixed in the axial direction of a hollow cylinder to which an upper pulley 6a and a lower pulley 6b are attached, and a pulley 9a on the pulling side and a pulley 9b on the pushing side are attached to the tip of the cylinder rod 8. an outer arm 3 and an upper pulley 13a on one side of the hollow cylinder.
An intermediate arm 4 with a lower pulley 13b attached to the other side and an inner arm 5 with an attachment attached to its tip are telescopically fitted inside and out, and two lines of wire ropes 15a and 15b fixed to the inner arm 5 are connected. On the other hand 15b
is sequentially wound from the lower pulley 13b to the upper pulley 13a of the intermediate arm 4, and further wound around the lower pulley 6b of the outer arm 3 and the pushing-side pulley 9b of the hydraulic cylinder 7, and its tip is fixed to the lower bracket of the outer arm 3, and the other The wire rope 15a is wound back from the upper pulley 6a of the outer arm 3 to the pulling pulley 9a of the hydraulic cylinder 7, and its tip is connected to the telescopic arm main body 2 whose tip is fixed to the upper bracket of the outer arm 3 and a boom valve of an earth-moving machine or the like. It has a support member 1 in which a slit or opening 1c is provided along the axial direction of a hollow cylindrical body 1b having a bracket 1a, and the telescopic arm main body 2 is attached to the support member 1,
The hydraulic cylinder 7 of the outer arm 3 faces the opening 1c of the support member 1 and is fitted into the support member 1 so that it can move forward and backward.
Telescopic arm device (2) characterized in that the cylinder 7 is integrally connected near the rear end. The cylinder 7 consists of a double rod type cylinder with a series of cylinder rods protruding on both sides, and the rear rod 8a has a pulling pulley 9a, and the front Telescopic arm device (3) according to claim 1, characterized in that pusher pulleys 9b are provided on each of the rear rods 8b, and the vicinity of the tip of the rear rod 8a is integrally connected to the vicinity of the rear end of the support member 1. The outer arm 3, intermediate arm 4, and inner arm 5 of the telescopic arm main body 2 are pulled up and the tuning wire 16a
The telescopic arm device according to claim 1 or 2, characterized in that the telescopic arm device is connected to the push-in tuning wire 16b.