JP4209349B2 - Construction machine arm structure - Google Patents

Description

  The present invention relates to an arm structure for a construction machine in which an arm angle sensor arranged in a region within the width of the arm can be attached to an arm portion.

There exists a thing shown by patent document 1 as this kind of prior art. In Patent Document 1, a pair of support plates facing each other is provided at the end of an arm located in the vicinity of the connecting portion with the boom, and the arm is disposed between these support plates, that is, in a region within the width of the arm. A configuration in which an angle sensor is mounted is shown.
Japanese Patent No. 2877716

  For example, the arm angle sensor is used for ensuring safety at the time of crane work for lifting an object in a bucket portion. However, in earth and sand excavation work performed in a harsh working environment where there are buildings around the arm, it may not be necessary to use the arm angle sensor, and the end of the arm is a protrusion for mounting the arm angle sensor. Therefore, the excavation work is restricted by the protrusions, and the efficiency of the excavation work may be reduced.

  The present invention has been made from the above-described state of the art, and an object thereof is an arm of a construction machine that enables a crane work and excavation work in a harsh working environment in which movement of the arm is easily restricted. To provide a structure.

To achieve the above object, according to the present invention, in the arm structure of a construction machine in which an arm angle sensor arranged in a region within the width of the arm can be attached to the arm portion, the arm angle sensor is housed . A bracket that forms a projecting portion projecting from the end portion of the arm is detachably provided on the end portion of the arm in accordance with the type of work performed by the construction machine .

  In the present invention configured as described above, in the crane work in which the arm angle sensor is utilized, the bracket in which the arm angle sensor is housed is attached to the arm, and the work may be performed in this state. Thus, the crane operation can be performed safely while stabilizing the vehicle body based on the signal of the arm angle sensor. For excavation work that does not require the use of an arm angle sensor, the bracket containing the arm angle sensor may be removed from the arm and the work may be performed in this state. As a result, the bracket that has formed the protruding portion is eliminated, and thus the range in which excavation work is possible is widened, and excavation work in a harsh working environment in which the movement of the arm is easily restricted is also possible.

  Further, the present invention is the above invention, wherein the bracket includes a first wall member and a second wall member that are arranged to face each other so as to sandwich the arm angle sensor, and a cover member that covers the arm angle sensor. It is characterized by that.

  The present invention configured as described above can realize a strong box structure that can protect the arm angle sensor housed therein by the first wall member, the second wall member, and the cover member.

  According to the present invention, in the above invention, the first wall member and the second wall member are formed separately from each other, the arm angle sensor is attached to the first wall member, and the cover member is attached to the second wall member. And mounting means for attaching a first wall member to which the arm angle sensor is mounted and a second wall member in which the cover member is integrally formed.

  Since the present invention configured as described above can be divided into two parts, the arm angle sensor can be attached to the divided first wall member, and the arm angle sensor can be easily attached to the first wall member. Moreover, since each divided | segmented weight becomes light compared with the whole weight of a bracket, each divided | segmented handling becomes easy.

  According to the present invention, in the above invention, the first wall member has a first bolt hole with high dimensional accuracy for attaching the first wall member to the arm, and the second wall member has the second wall member. It has the 2nd bolt hole larger than the said 1st bolt hole for attaching a wall member to the said arm, It is characterized by the above-mentioned.

  In the present invention configured as described above, since the first wall member has the first bolt hole with high dimensional accuracy, the mounting accuracy of the first wall member with respect to the arm is increased, and the arm angle attached to the first wall member is increased. The sensor can be positioned with high accuracy relative to the arm. In addition, since the second wall member has a second bolt hole larger than the first bolt hole of the first wall member, the second wall member including the cover member is attached to the arm via the second bolt hole. Thus, the mounting error of the second wall member can be absorbed. That is, it is possible to absorb the displacement of the mounting position of the second wall member with respect to the arm. Therefore, the second wall member including this cover member can be easily attached to the arm.

  In the present invention, since the bracket storing the arm angle sensor is detachably attached to the arm, the bracket may be attached to the arm when the crane is working, and the arm may be operated. At the time of excavation work that does not require the use of the angle sensor, the work may be performed by removing the bracket in which the arm angle sensor is housed, which is suitable for both crane work and excavation work. In particular, during excavation work, the brackets that formed the protrusions are removed, making it easier to perform excavation work in harsh working environments where the movement of the arm is easily restricted. Can be improved.

  The best mode for carrying out an arm structure for a construction machine according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a side view showing an example of a hydraulic excavator provided with an embodiment of an arm structure of the present invention.

As shown in FIG. 1, the hydraulic excavator provided with the present embodiment includes a traveling body 1 and a revolving body 2 disposed on the traveling body 1. A driver's seat 3 is disposed on the revolving structure 2. A boom 5 is connected to the front side of the swing body 2 via a swing post 4 so as to be rotatable in the vertical direction. An arm 6 as an object of the present embodiment is connected to the tip of the boom 5 so as to be rotatable in the vertical direction, and a bucket 7 is connected to the tip of the arm 6 so as to be rotatable in the vertical direction. A boom cylinder 8 that drives the boom 5, an arm cylinder 9 that drives the arm 6, and a bucket cylinder 10 that drives the bucket 7 are provided. A bracket 11 that forms a protrusion characteristic of the present embodiment is detachably attached to the end 6a of the arm 6 at the end 6a of the arm 6 connected to the boom 5 described above. As will be described later, an arm angle sensor is accommodated in the bracket 11. Further, the boom 5 and the arm 6 are connected via a support pin 12 so as to be relatively rotatable.

  2 is a view showing an arm portion of the hydraulic excavator shown in FIG. 1, and is an enlarged side view corresponding to the state seen from the back side of the paper surface of FIG. 1. FIG. 3 shows a main part of FIG. FIG. 4 is an enlarged view showing a state in which the second wall member and the cover member are omitted, and FIG. 4 corresponds to the state seen from the direction A in FIG. 3 and shows a state in which a part of the cover member constituting the bracket is omitted. FIG. 5 is an exploded perspective view of a bracket portion provided in the present embodiment.

  For example, as shown in FIG. 5, the bracket 11 described above includes a first wall member 11 a and a second wall member 11 b that are arranged to face each other so as to sandwich the arm angle sensor 17, and a cover member that covers the arm angle sensor 17. 11c. The first wall member 11a and the second wall member 11b are, for example, formed separately from each other. The arm angle sensor 17 is attached to the first wall member 11a, and the cover member 11c is integrally provided on the second wall member 11b by welding or the like.

  A plurality of connection fittings 11a1 are integrally provided in the first wall member 11a by welding or the like, and a hole 11c1 is formed in the cover member 11c at a position matching the hole 11a2 of the connection fitting 11a1. The diameter dimension of the hole 11c1 of the cover member 11c is set larger in advance than the diameter dimension of the hole 11a2 of the connection fitting 11a1. A mounting bolt (not shown) is inserted into the hole 11a2 of the connection fitting 11a1 and the hole 11c1 of the cover member 11. The first wall member 11a to which the arm angle sensor 17 is mounted by the connection fitting 11a1 having the hole 11a2 described above, the hole 11c1 of the cover member 11c, and a bolt (not shown) inserted into these holes 11a2 and 11c1, Attachment means for attaching the cover member 11c to the second wall member 11b provided integrally is configured.

  As shown in FIG. 5, the first wall member 11 a described above has a plurality of first bolt holes 11 a 3 with high dimensional accuracy for attaching the first wall member 11 a to the end portion 6 a of the arm 6. In other words, the diameter dimensions of the first bolt holes 11a3 are made to correspond to the diameter dimensions of the bolts 13 inserted into the first bolt holes 11a3 and the bolt holes 6b formed in the end portions 6a of the arms 6. And the pitch dimension between the first bolt holes 11a3 is set with high accuracy corresponding to the pitch dimension between the plurality of bolt holes 6b formed in the end 6a of the arm 6. . The second wall member 11b has a plurality of second walls set in advance to a diameter larger than the diameter of the first bolt hole 11a3 for attaching the second wall member 11b to the end 6a of the arm 6. It has a bolt hole 11b1. That is, the dimensional accuracy of the plurality of second bolt holes 11b1 of the second wall member 11b is set more moderately than that of the first bolt holes 11a3 of the first wall member 11a described above. The bracket 11 configured in this manner is disposed within the width of the arm 6 as shown in FIG. That is, the arm angle sensor 17 is disposed in a region within the width dimension of the arm 6.

Further, as shown in FIG. 5, the first wall member 11a has the first bolt holes 11a3 fitted in the bolt holes 6b of the end 6a of the arm 6 shown in FIG. , 6b, the bolt 13 is inserted, and the first wall member 11a is fastened to the end 6a of the arm 6 by the bolt 13. As shown in FIG. 4, the second wall member 11b is fitted in a bolt hole (not shown) formed in the end 6a of the arm 6 with the second bolt hole 11b1 shown in FIG. The bolt 13 having the same shape and dimensions as the bolt 13 for fastening the first wall member 11 a to the end 6 a of the arm 6 is inserted, and the second wall member 11 b is fastened to the end 6 a of the arm 6 by the bolt 13.

  As shown in FIG. 5, the operating lever 16 that operates the arm angle sensor 17 is fastened to the fixing bracket 15. As shown in FIGS. 3 and 4, the fixing metal 15 is fixed to the distal end portion of the rod portion 9 a of the arm cylinder 9 via a connection pin 14.

  In FIG. 3, reference numeral 18 denotes a cable for guiding a signal output from the arm angle sensor 17, and reference numeral 19 denotes a hydraulic pipe, that is, a hose to which pressure oil for operating the arm cylinder 9 is guided, for example. The cable 18 and the hose 19 are arranged so as to be routed along a place where the operation of the arm cylinder 9 and the operation of the arm angle sensor 17 are not hindered.

  In the present embodiment configured as described above, for example, in a crane operation, as shown in FIG. 1, the bracket 11 is attached to the end 6 a of the arm 6. In this case, as shown in FIG. 5, the arm angle sensor 17 is attached to the first wall member 11 a constituting the bracket 11. For example, each of the first bolt holes 11a3 of the first wall member 11 is adapted to each of the bolt holes 6b formed in the end portion 6a of the arm 6, and the bolt 13 is inserted into these bolt holes 11a3 and 6b. Then, the first wall member 11 is fastened to the end 6 a of the arm 6. 5 is fixed to the tip end portion of the rod portion 9a of the arm cylinder 9 via the connection pin 14, as shown in FIGS.

  For example, in this state, each of the second bolt holes 11b1 of the second wall member 11b integrally including the cover member 11c is adapted to the corresponding bolt hole formed in the end portion 6a of the arm 6, and the cover member 11c The hole 11c1 is adapted to the hole 11a2 of the connection fitting 11a1 of the first wall member 11a. Here, bolts (not shown) are inserted into the holes 11c1 and 11a2, and the cover member 11c is fastened to the connection fittings 11a1 of the first wall member 11a with the bolts (not shown).

  Then, the bolt 13 is inserted into the second bolt hole 11b1 of the second wall member 11b and the bolt hole formed in the end 6a of the arm 6, and the second wall member 11b is inserted into the end 6a of the arm 6 by the bolt 13. To conclude.

  Thus, in the crane work performed by attaching the bracket 11 in which the arm angle sensor 17 is accommodated to the end portion 6a of the arm 6, for example, an object is lifted by the bucket 7, and the arm 6 is rotated with respect to the boom 5 at this time. The moving angle is detected by the arm angle sensor 17 and, for example, an alarm is sounded according to a signal output from the arm angle sensor 17 so as to prevent the vehicle body from overturning to alert the operator. Thereby, a desired crane operation can be performed safely.

  Further, when excavating earth and sand that does not require the use of the arm angle sensor 17, the bracket 11 in which the arm angle sensor 17 is accommodated and the fixing bracket 15 are removed by a procedure reverse to the above, for example, and the rod of the arm cylinder 9 is removed. The tip of the portion 9a is connected to the end 6a of the arm 6 by the pin 14 shown in FIGS.

  6 is a side view of the excavator showing a state in which the bracket is removed from the state shown in FIG. 1, and FIG. 7 is a view showing an arm portion of the excavator shown in FIG. 6, as viewed from the back side of the paper of FIG. It is a corresponding enlarged side view.

  As shown in FIGS. 6 and 7, when the bracket 11 in which the arm angle sensor 17 is housed is removed, no protrusion is formed on the end 6 a of the arm 6, so that excavation work is possible. Even when the range is wide and there are buildings or the like and the conditions of excavation work are severe, restrictions on excavation work received from the work environment can be relaxed. Thereby, excavation work in such a harsh work environment can be performed efficiently.

  Further, in the present embodiment, the bracket 11 forms a strong box structure capable of protecting the arm angle sensor 17 accommodated therein by the first wall member 11a, the second wall member 11b, and the cover member 11c. As a result, the arm angle sensor 17 does not protrude outward from the bracket 11, and the arm angle sensor 17 can be prevented from being damaged by contact with rocks or the like generated by excavation, and the highly reliable arrangement structure of the arm angle sensor 17 can be prevented. Can be realized.

  Moreover, since this embodiment can divide the whole into the 1st wall member 11a side and the 2nd wall member 1b side, the arm angle sensor 17 can be attached to the 1st wall member 11a in the divided | segmented state, The arm angle sensor 17 can be easily attached to the first wall member 11a. Moreover, since each divided | segmented weight becomes lighter than the whole weight of the bracket 11, handling of each divided | segmented becomes easy.

  Further, in the present embodiment, since the first wall member 11a has the first bolt hole 11a3 having high dimensional accuracy, the mounting accuracy of the first wall member 11a with respect to the end portion 6a of the arm 6 is improved, and the first wall member 11a. The arm angle sensor 17 attached to the arm 6 can be positioned with high accuracy with respect to the end 6 a of the arm 6. Therefore, the rotation angle of the arm 6 with respect to the boom 5 can be detected with high accuracy. The cover member 11c has a hole 11c1 having a larger diameter than the hole 11a2 of the connection fitting 11a3 of the first wall member 11a, and the second wall member 11b is more than the first bolt hole 11a3 of the first wall member 11a. Since the second bolt hole 11b1 having a large diameter is provided, the arm angle sensor 17 is mounted as described above, and the first wall member 11a attached to the end 6a of the arm 6 and the end 6a of the arm 6 are provided. When attaching the second wall member 11b including the cover member 11c, the mounting dimension error can be absorbed through the hole 11c1 and the second bolt hole 11b1 of the cover member 11c described above. That is, the displacement of the attachment position of the cover member 11c with respect to the first wall member 11a and the displacement of the attachment position of the second wall member 11b with respect to the end portion 6a of the arm 6 can be absorbed. Therefore, the second wall member 11b including the cover member 11c can be easily attached to both the first wall member 11a to which the arm angle sensor 17 is attached and the end portion 6a of the arm 6. That is, the attachment / detachment work of the bracket 11 with respect to the end portion 6a of the arm 6 can be easily performed.

It is a side view showing an example of a hydraulic excavator with which one embodiment of the arm structure of the present invention is provided. It is a figure which shows the arm part of the hydraulic shovel shown in FIG. 1, and is an enlarged side view corresponding to the state seen from the back side of the paper surface of FIG. FIG. 3 is an enlarged view showing a main part of FIG. 2 and a state in which a second wall member and a cover member constituting the bracket are omitted. It is a figure which corresponds to the state seen from A direction of FIG. 3, and shows the state which abbreviate | omitted a part of cover member which comprises a bracket. It is a disassembled perspective view of the bracket part with which this embodiment is equipped. It is a side view of the hydraulic shovel which shows the state which removed the bracket from the state shown in FIG. It is a figure which shows the arm part of the hydraulic shovel shown in FIG. 6, and is an enlarged side view corresponding to the state seen from the back side of the paper surface of FIG.

Explanation of symbols

6 Arm 6a End 6b Bolt hole 9 Arm cylinder 11 Bracket 11a First wall member 11a1 Connection fitting (attachment means)
11a2 hole 11a3 first bolt hole 11b second wall member 11b1 second bolt hole 11c cover member 11c1 hole (attachment means)
12 Support Pin 13 Bolt 14 Connection Pin 15 Fixing Bracket 16 Actuation Lever 17 Arm Angle Sensor

Claims (4)

In the arm structure of a construction machine in which an arm angle sensor arranged in a region within the width dimension of the arm can be attached to the arm part,
A bracket that houses the arm angle sensor and forms a protruding portion that protrudes from the end of the arm is detachably provided at the end of the arm according to the type of work performed on the construction machine. Construction machine arm structure. In the invention of claim 1,
An arm of a construction machine, wherein the bracket includes a first wall member and a second wall member that are arranged to face each other so as to sandwich the arm angle sensor, and a cover member that covers the arm angle sensor. Construction. In the invention of claim 2,
Forming the first wall member and the second wall member separately from each other;
The arm angle sensor is attached to the first wall member, and the cover member is integrally provided on the second wall member,
An arm structure for a construction machine, comprising attachment means for attaching a first wall member to which the arm angle sensor is mounted and a second wall member integrally formed with the cover member. In the invention of claim 3 above,
The first wall member has a plurality of first bolt holes for attaching the first wall member to the end portion of the arm, and the second wall member attaches the second wall member to the arm. have a plurality of second bolt holes larger than the first bolt hole for,
The diameter dimension of the first bolt hole is set with high accuracy corresponding to the diameter dimension of the bolt inserted into the first bolt hole and the plurality of bolt holes formed at the end of the arm. ,
The bolt is inserted into the second bolt hole, arm structure for a construction machine characterized by forming Rukoto bolt having the same diameter as the bolt inserted into the first bolt hole.

Images