JPH10331197A - Backhoe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a backhoe which can make excavating works to dig a trench, even a deep one, without requiring an operator forcedly to take an unreasonable attitude. SOLUTION: A rotary support 4 is mounted on a rotary member supporting element of a running machine table 2 in such a way as rotated round the first vertical axis P1 and a back hoe device 5 is installed on a back hoe mounting part furnished on the rotary support 4 in such a way as rotatable round the second vertical axis P2. An upper turntable 3 equipped with a manipulation part with an operator riding is furnished in such a way as rotated round the first vertical axis P1 with respect to the rotary member supporting element in such a way as separately from the rotary support 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backhoe provided with an upper swivel provided with a boarding operation section so as to be rotatable around the first longitudinal axis with respect to the rotating member support.

[0002]

2. Description of the Related Art Conventionally, in this type of backhoe,
For example, as disclosed in Japanese Patent Application Laid-Open No. 8-269996, a backhoe device is provided at the front end of the swivel so as to freely swing left and right.

[0003]

By the way, in the backhoe having the above-mentioned conventional structure, when performing a trench excavation work,
Excavation work has been performed with the backhoe device obliquely in a plan view so that the excavation position is located at a position deviated from the left and right centers of the fuselage. However, when performing such work, it is difficult to perform the work of digging in a straight line back and forth due to the oblique digging state, and the worker leans the swivel to monitor the digging point in front and works to monitor the body. There was a problem that the work had to be continued in a slanted and unreasonable posture, and the tire was easily fatigued. Therefore, as disclosed in, for example, Japanese Patent Application Laid-Open No. 8-81974, the arm of the backhoe apparatus can be displaced in the left-right direction so that the bucket can be excavated along the front-rear direction even in the case of guttering work. There has been proposed an offset structure that breaks down. However, this conventional structure also has the following problems. That is, since the offset portion of the arm may come into contact with the sheet pile of the excavation groove, the excavation depth is regulated to be relatively shallow, so that deep excavation work cannot be performed.

The present invention has been made in view of the above circumstances, and provides a backhoe capable of performing a digging operation without forcing a worker to perform an excessive posture while performing a deep digging operation in a trench digging operation. With the goal.

[0005]

[Means for Solving the Problems]

(Structure) In the backhoe according to claim 1 of the present invention, a rotation support is mounted on a rotation member support of a traveling machine base so as to be rotatable around a first longitudinal axis. A backhoe device is mounted on the backhoe mounting portion provided so as to be rotatable around a second longitudinal axis, and the upper revolving base provided with the boarding operation portion is formed on the rotating member support with respect to the rotating member support. Separately, it is provided so as to be rotatable around the first longitudinal axis.

According to the first aspect of the present invention, when performing a trench excavation work deviated from the left and right center of the body, the second vertical axis position at which the backhoe swings is set to the body position. In a state deviated from the center in the left and right direction,
By appropriately rotating the rotation support around the first vertical axis relative to the rotation member support, and swinging the backhoe apparatus around the second vertical axis in that state, the boom or arm of the backhoe apparatus, The bucket can be set so as to be swingably operated in the front-rear direction in plan view, and in this state, excavation work for digging a side ditch along the front-rear direction can be performed. Even at that time, since the upper swivel can rotate around the first longitudinal axis relative to the traveling machine stand separately from the backhoe device, the upper swivel must be maintained in a state in which the upper swivel is oriented in the front-rear direction. Therefore, the worker in the boarding operation section of the upper swivel can perform the gutter digging work with a reasonable posture looking forward and forward.

(Effect) Therefore, according to the structure of the first aspect of the present invention, the base end of the backhoe apparatus is located at a position deviated from the center in the left-right direction with respect to the body, and By swinging the backhoe device around the second vertical axis, the excavation work can be performed in the front-rear direction, so that the excavation can be performed in parallel with the sheet pile of the gutter, and the excavation depth of the backhoe apparatus is different from the sheet pile. It is possible to avoid being limited by the interference, and therefore, it is possible to perform a deep gutter work. Further, since the trench can be excavated by a scraping operation using a bucket extending in the front-rear direction, the number of excavation operations can be reduced, and a careful operation of forcing the side wall of the gutter to avoid excessively excavating can be avoided. Furthermore, since the backhoe riding operator can perform the gutter excavation work without any difficulty in the posture, fatigue during the work can be reduced and workability can be improved.

(Structure) A backhoe according to a second aspect of the present invention is the backhoe according to the first aspect, wherein an angle range in which the rotation support member can rotate around the first longitudinal axis is 36.
A feature is that the angle is set smaller than 0 degrees.

(Operation) According to the configuration of the second aspect of the present invention, the angle range in which the rotation support member can rotate around the first longitudinal axis is set to be smaller than 360 degrees. For example, in the case of a rotary drive using a gear mechanism, a gear does not need to be formed over the entire circumference, and the angle range of the rotary drive is larger than that in which the rotary support is supported in a state of full rotary drive. Because it can be made smaller, the structure can be simplified.

(Effect) Therefore, according to the configuration of the second aspect of the present invention, the structure can be simplified.

(Structure) A backhoe according to a third aspect of the present invention is the backhoe according to the first aspect, wherein the rotating support is configured to be capable of fully rotating about the first longitudinal axis. Configuration.

(Operation) According to the third aspect of the present invention, since the rotary support is configured to be able to fully rotate around the first longitudinal axis, the earth and sand excavated by the backhoe apparatus can be desirably formed. When discharging at the discharge position, it can be moved in either a right turn or a left turn.

(Effects) Therefore, according to the configuration of the third aspect of the present invention, when the vehicle cannot turn right due to, for example, a side wall, the vehicle turns left. In this way, the excavated earth and sand can be discharged, so that the versatility of the turning operation can be increased.

(Structure) A backhoe according to a fourth aspect of the present invention is the backhoe according to the first aspect, wherein the rotary support is rotated by a hydraulic motor. I do.

(Operation) According to the structure of the fourth aspect of the present invention, since the rotary drive of the rotary support is performed by the hydraulic motor, the rotational power of the hydraulic motor is used as it is by the gear mechanism. And the like, can be used for the rotation driving of the rotation support member, so that the mechanical support can be simplified.

(Effects) Therefore, according to the configuration of the fourth aspect of the present invention, the structure for driving the rotary support to rotate can be mechanically simple.

(Structure) According to a fifth aspect of the present invention, in the backhoe according to the second aspect, the rotary support is configured to be rotated by a hydraulic cylinder. And

(Operation) According to the structure of the fifth aspect of the present invention, since the rotary support is configured to be driven by the hydraulic cylinder, the rotary support is directly provided without using a gear mechanism or the like. Since the rotating support can be rotationally driven, the structure can be further simplified.

(Effects) Therefore, according to the structure of claim 5 of the present invention, the structure can be further simplified and the structure can be reduced.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a backhoe. The backhoe is provided with a first longitudinal axis P with respect to a traveling machine base 2 supported by a pair of left and right crawler traveling devices 1 and 1.
An upper swivel 3 is provided so as to be relatively rotatable around 1 and a cylindrical body 4 as a rotary support provided in a state interposed between the upper swivel 3 and the traveling machine base 2. Backhoe device 5
Is configured.

A boarding operation section 6 and a prime mover 7 are mounted on the swivel base 3, and the backhoe device 5 is driven by the hydraulic mechanism driven by the engine E in the prime mover 7, The turning operation of the platform 3 with respect to the traveling machine base 2 is performed. As shown in FIGS. 1 to 5, a first vertical axis P <b> 1 located at the left and right center of the traveling machine base 2.
A fixed cylindrical body 8 as a rotating member support is bolted to the traveling machine base 2 with the center at the center. This fixed cylinder 8
The cylindrical body 4 is fitted around the first longitudinal axis P1 so as to be rotatable around the first longitudinal axis P1 via bearings 9 and 9. The cylindrical body 4 has a gear portion 4A at the lower portion of the outer periphery over the entire periphery.
And a support bracket 4B as a backhoe mounting portion for swingably supporting the backhoe device 5 around a second vertical axis P2 along the vertical direction, and a hydraulic cylinder for swinging the backhoe device 5 A second support bracket 11 for rotatably supporting the base end of the cylindrical member 10 around a third longitudinal axis P3 is provided integrally with the tubular body 4. The phase of the second vertical axis P2 and the third vertical axis P3 around the first vertical axis P1 is set to 90 degrees.

A ring member 12 is integrally connected to the upper part of the cylindrical body 4 by bolt connection. A cylindrical lower support member 13 provided at the center of the lower surface of the upper turntable 3 is rotatably fitted on the inner peripheral portion of the ring member 12 via the bearing 14 so as to be rotatable around the first longitudinal axis P1. doing. 2 and 3 to rotate the upper revolving base 3 around the first longitudinal axis P1 with respect to the traveling machine base 2.
As shown in (1), a first pinion gear 15 meshing with a gear portion 8A formed on the inner peripheral portion of the fixed cylindrical body 8 is rotationally driven by a first hydraulic motor 16 installed on the upper turntable 3 side. It is configured as follows. Further, the cylindrical body 4 is connected to the first longitudinal axis P1.
A second pinion gear 18 which is rotationally driven by a second hydraulic motor 17 as a hydraulic motor fixedly installed on the traveling machine base 2 is meshed with the gear portion 4A in order to rotate around. Here, since the gear portion 4A is formed on the entire outer periphery of the cylindrical body 4, the cylindrical body 4 rotated by the second pinion gear 18 driven to rotate by the second hydraulic motor 17 is the All turns are possible around the center of one vertical axis.

With the above configuration, for example, when a gutter excavation operation as shown in FIG. 5 is performed, the crawler traveling devices 1 and 1 are moved so that the traveling machine body 2 can retreat along a direction along the gutter where the excavation is performed. The second hydraulic motor 17 is driven as desired in accordance with the deviation between the excavation position and the center position in the lateral direction of the fuselage, and the second pinion gear 18 is positioned in parallel with the direction along the gutter. The second hydraulic motor 17 is stopped and locked in a state where the second longitudinal axis position P2 is set within the rearward extension of the side groove, and the second hydraulic motor 17 is stopped and locked. The excavation work is performed with the body 4 fixed. If the first hydraulic motor 16 is locked, the relative attitude between the traveling machine body 2 and the upper turntable 3 does not change, and the boarding operation unit 6 in the upper turntable 3 does not change.
Can excavate in front. When the backhoe 5 is rotated around the first longitudinal axis P1 to discharge excavated earth and sand, the first hydraulic motor 16 is rotationally driven in synchronization with the second hydraulic motor 17. Thus, the upper turntable 3 can be turned in a state where the relative attitude between the backhoe device 5 and the upper turntable 3 does not change.

[Alternative Embodiment] In the above-described embodiment, an example in which a cylindrical body as a rotation support member is rotated around a first longitudinal axis using a hydraulic motor has been described. Alternatively, the hydraulic cylinder may be rotated by a hydraulic cylinder. In this case, the hydraulic cylinder is constructed to extend over the cylindrical body and the traveling machine base. In this case, since the expansion and contraction of the hydraulic cylinder is limited, the rotatable range around the first axis of the rotary support is smaller than 360 degrees. The rotating support, the upper revolving base, and the rotating member support may be configured to be rotatably supported around the first longitudinal axis by thrust bearings.

[Brief description of the drawings]

FIG. 1 is a side view showing a backhoe.

FIG. 2 is a longitudinal sectional side view showing a main part.

FIG. 3 is a partially broken plan view showing a main part of the backhoe.

FIG. 4 is an exploded perspective view of a main part.

FIG. 5 is a plan view showing a trench excavation work using a backhoe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 2 Traveling machine stand 3 Upper revolving base 4 Rotation support 4B Backhoe mounting part 5 Backhoe device 6 Boarding operation part 8 Rotation member support 17 Hydraulic motor P1 First longitudinal axis

Claims (5)

[Claims] 1. A rotating support is mounted on a rotating member support of a traveling machine base so as to be rotatable about a first longitudinal axis, and a second backhoe mounting portion provided on the rotating support has a second Attaching the backhoe apparatus so as to be rotatable around the vertical axis, and moving the upper swivel provided with the boarding control section around the first vertical axis separately from the rotary support with respect to the rotary member support. A backhoe that can be driven to rotate. 2. The backhoe according to claim 1, wherein an angle range in which the rotation support member can rotate around the first longitudinal axis is set to be smaller than 360 degrees. 3. The backhoe according to claim 1, wherein the rotating support is configured to be capable of fully rotating about the first longitudinal axis. 4. The backhoe according to claim 1, wherein the rotary support is rotated by a hydraulic motor. 5. The backhoe according to claim 2, wherein the rotary support is configured to perform rotary drive by a hydraulic cylinder.