JPH04122750U - hydraulic power shovel - Google Patents

Abstract

(57) [Summary] [Purpose] In a hydraulic power excavator having a lower boom and an upper boom, the angle of the arm relative to the ground is maintained constant when the upper boom is pivoted up and down with respect to the lower boom. To make it easier to operate a hydraulic power shovel. [Structure] The arm cylinder is mounted between the tip of the lower boom and the rear end of the arm, so that the arm, upper boom, lower boom, and arm cylinder can form a parallelogram link. do.

Description

[Detailed explanation of the idea]

0001 This invention relates to a hydraulic power excavator, and in particular, it does not move even when the upper boom is pivoted. A hydraulic power excavator that can maintain a constant angle of the arm to the ground. It depends.

0002

[Conventional technology]

An example of a conventional hydraulic power shovel is shown in a side view in FIG. This hydraulic The type power excavator has a lower traveling body 51 and a vertical axis on the lower traveling body 51. It has a rotatable upper revolving body 44. The lower boom 4 is attached to the upper revolving body 44. The rear end of the lower boom 40 is pivotally connected to the rear end of the upper boom 41. An arm 42 is pivotally connected to the front end of the upper boom 41. . A sub-arm 46 is provided at the front end of the arm 42 so as to be rotatable around the axis (X-X). is mounted, and a bucket 43 is pivotally attached to the front end of the sub-arm 46.

0003 The lower boom 40 and the upper revolving body 44 serve as driving means for these members. There is a lower boom cylinder 50 in between, and between the upper boom 41 and the lower boom 40. There is an upper boom cylinder 49 between the upper boom 41 and the arm 42. A bucket cylinder is provided between the bucket cylinder 45 and the sub-arm 46 and the bucket 43. 47 are respectively mounted, and the sub-arm 46 is attached to the axis (X) with respect to the arm 42. - A rotating device 48 is mounted on the arm 42 for rotating around the .

0004

[Problem that the idea aims to solve]

In a conventional hydraulic power excavator as explained in Fig. 3, the boom is located at the lower -Since it is divided into boom 40 and upper boom 41, arm 42 and sub-boom Although the arm 46 can be positioned vertically for excavation work, the arm 42 and the angle of the sub-arm 46 with respect to the ground, that is, the angle with respect to the ground, is maintained constant. If you try to move the arm 42 and sub-arm 46 vertically until the lower Boom cylinder 50, upper boom cylinder 49, and arm cylinder 45 Three actuators must be activated at the same time, making the operation extremely complicated. It was. Especially when the upper boom 41 is pivoted up and down, the lower boom 40 The ground angle changes of the arm 42 and sub-arm 46 compared to when the arm 42 and the sub-arm 46 are pivoted up and down. becomes larger, and the lower arm is moved while maintaining the arm 42 and sub-arm 46 in the vertical direction. The arm 4 is activated by simultaneously operating the arm cylinder 50 and the upper boom cylinder 49. 2 and the sub-arm 46 were extremely difficult to move up and down.

[0005]

[Means to solve the problem]

The present invention includes an undercarriage body and an upper revolving body rotatably mounted on the undercarriage body. a lower boom whose rear end is pivotally connected to the upper revolving structure; and a front end of the lower boom. an upper boom having a rear end pivotally connected to the upper boom by a first pin; an arm whose rear end is pivotally connected to the front end of the arm by a second pin; and an arm connected to the arm. a bucket interposed between the upper boom and the lower boom. In a hydraulic power excavator having an upper boom cylinder with a The rear end of the arm is pivotally connected to the front end of the arm by a third pin, and an arm cylinder whose front end is pivotally connected to the rear end by a fourth pin; The distance between the first pin and the third pin is the distance between the second pin and the fourth pin. the third pin and the fourth pin by the arm cylinder the distance between the first pin and the second pin is equal to the distance between the first pin and the second pin; It is characterized by being able to become.

[0006]

[Effect]

According to the present invention, the distance between the third pin and the fourth pin is increased by the arm cylinder. If the separation is made equal to the distance between the first pin and the second pin, then , a straight line connecting the first pin and the third pin and a straight line connecting the second pin and the fourth pin is always kept parallel to. In other words, the arm pivoted to the arm cylinder, The upper boom is pivoted to the upper boom, the lower boom is pivoted to the upper boom, An arm cylinder pivotally connected to the lower boom constitutes a parallelogram link. follow Even if you operate the upper boom cylinder and pivot the upper boom up and down, , unless the arm cylinder and lower boom cylinder are operated. The angle remains constant. Thus, by operating only the upper boom cylinder, The arm can be moved in parallel while maintaining the arm's ground angle constant.

[0007]

【Example】

Next, one embodiment of the present invention will be described with reference to FIGS. 1 and 2. Figure 1 is Figure 2 is a side view of a hydraulic power shovel that is an embodiment of the present invention. FIG. 3 is a side view for explaining the movement. For example, above the lower traveling body 1 consisting of a crawler etc., the upper rotating body 2 has a vertical axis. It is mounted to rotate around the Although not shown in the upper revolving body 2, It is equipped with a driver's cab, engine, hydraulic motor, hydraulic pump, etc. upper rotating body The rear end of the lower boom 4 is pivotally connected to the lower boom 2 by a pin 16. 4 is pivotable up and down about a pin 16. This pivoting of lower boom 4 The front end is pivotally connected to the lower boom 4 with a pin 17, and the rear end is pivotally connected to the upper revolving structure 2. This is done by the lower boom cylinder 3 which is pivotally mounted at the pin 15. In front of lower boom 4 The rear end of the upper boom 6 is pivotally attached to the end by a pin 18. upper The vertical pivoting of the boom 6 around the pin 18 means that the front end of the upper boom 6 is connected to the pin 1. 9 and whose rear end is pivotally connected to the lower boom 4 with a pin 32; This is done by the cylinder 5. The rear end of the arm 8 is attached to the front end of the upper boom 6 with a pin. It is pivoted at 22. The arm 8 is connected to the axis of the arm 8 via the rotation bearing 30. A support member 34 rotatable around (X-X) is provided. Arm of support member 34 The rotation relative to the arm 8 is performed by a rotation device 31 such as a hydraulic motor provided on the arm 8. .

[0008] The rear end portion of the sub-arm 10 is pivotally attached to the support member 34 with a pin 23. subarea The pivoting of the arm 10 is achieved by having the front end pivotally connected to the sub-arm 10 by a pin 25 and by a support member 34. This is done by a sub-arm cylinder 9 whose rear end is pivotally connected with a pin 24. Sub arm 1 A bucket 12 is pivotally attached to the front end of the bucket 0 via a pin 29. Bucket 12 One end of the rod 14 is pivotally attached to the sub-arm 10 via a pin 28, and a pin 3 is attached to the sub-arm 10. 3, one end of the link 13 is pivotally connected to the other end of the rod 14 and the other end of the link 13. are pivotally connected to each other by a pin 27. This pin 27 is also a bucket The front end of the cylinder 11 is also pivotally connected, and the rear end of the bucket cylinder 11 is attached to the sub-assembly. It is pivotally connected to the arm 10 with a pin 26. The pivot of bucket 12 is bucket syringe. This is done by the data processor 11.

[0009] What should be noted in this invention is that the arm cylinder 7 is connected to the arm 8 and the lower arm. This means that it is interposed between the frame 4 and the That is, the front end of the arm cylinder 7 The rear end of the arm cylinder 7 is pivotally connected to the rear end of the arm 8 by a pin 21, and the rear end of the arm cylinder 7 is It is pivotally connected to the front end of the lower boom 4 by a pin 20. And pin 18 The distance between pin 20 is equal to the distance between pin 22 and pin 21, and the arm series The distance between pin 20 and pin 21 is reduced by the distance between pin 18 and pin 22 by the conductor 7. The length can be equal to the distance. Thus, arm cylinder 7 Therefore, when the distance between pin 20 and pin 21 is set to the above-mentioned length, the pin A parallelogram link pivotally connected by pin 21, pin 22, pin 18, and pin 20 is constructed. It will be accomplished.

0010 The operation of the present invention will be explained with reference to FIG. The parallelogram link mentioned above Therefore, when only the upper boom cylinder 5 is telescopically operated, the solid line in Fig. 2 The angle of the arm 8 and the sub-arm 10 relative to the ground is maintained constant as shown by The arm 8 and sub-arm 10 then move up and down. Of course, arm 8 And when trying to change the ground angle of the sub-arm 10, the arm cylinder 7, and in this way, the same operation as the conventional one can be performed.

[0011] The hydraulic power shovel shown in FIG. 1 has a rotating device 31 on the arm 8. Support member 34, sub-arm 10, sub-arm cylinder 9, bucket The kit 12, bucket cylinder 11, etc. can be rotated around the axis (X-X). Because of this, there is a large degree of freedom for these members, and it is possible to dig side ditches and around obstacles. It is possible to carry out various types of excavation such as drilling. In addition, finishing work such as land leveling work and side profile of ditches etc. Therefore, it is particularly useful for positioning and trajectory control of the bucket 12. becomes important. Then, the ground angle of arm 8 and sub-arm 10 was kept constant. Work in which the arm 8 and sub-arm 10 are frequently moved up and down or back and forth. is requested.

0012 According to this embodiment, when the above-described parallelogram link is configured, the When only the upper boom 6 is pivoted up and down, the arm 8 and sub arm 10 are The angle does not change, but the arm 8 and sub-arm 10 are vertically parallel as shown in Figure 2. Move (although it also involves moving back and forth). In addition, upper boom cylinder 5 and lower - By concentrating almost exclusively on operation with boom cylinder 3 (arm cylinder 7 is necessary as an auxiliary operation), arm 8 and sub arm 10 can only be moved forward and backward. It can also be translated in parallel. Furthermore, through automatic control of hydraulic power excavators, Even when an operation is performed, the number of objects to be controlled is reduced, making control easier.

[0013] In addition, in the embodiment described above, the arm 8 is equipped with a rotation device 31 and a rotation bearing 30. Although the sub-arm 10 can be rotated around the axis (X-X), such rotation is not possible. The rotating means is not essential to the present invention, and the present invention does not have such a rotating means. It is also applicable to hydraulic power excavators. In addition, the sub-area shown in Figure 3 This invention is also applicable to hydraulic power excavators that do not have a brake cylinder. It is.

[0014]

[Effect of the idea]

According to the hydraulic excavator of the present invention, the above-mentioned parallelogram link is configured. In this state, the angle of the arm relative to the ground remains constant even when the upper boom is pivoted up and down. is held, which allows the arm to be translated in translation. Arm angle to the ground In the work of moving the arm up and down and back and forth while maintaining the , can concentrate on operating the lower boom cylinder and upper boom cylinder. This can reduce the burden on workers. Furthermore, this invention is a hydraulic power excavator. Even when operating by automatic control, control can be made easier. Wear.

[Brief explanation of drawings]

FIG. 1 is a side view of a hydraulic power shovel that is an embodiment of the present invention.

FIG. 2 is a side view of the hydraulic power shovel for explaining the operation of this embodiment.

FIG. 3 is a side view of a conventional hydraulic power shovel.

[Explanation of symbols]

1 Running body 2 Upper revolving body 3 Lower boom cylinder 4 Lower boom 5 Upper boom cylinder 6 Upper boom 7 Arm cylinder 8 Arm 9 Sub arm cylinder 10 Sub arm 11 Bucket cylinder 12 Bucket 13 Links 14 Rod 15 pin 16 pins 17 pin 18 pin 19 pin 20 pins 21 pin 22 pins 23 pin 24 pin 25 pin 26 pins 27 pin 28 pin 29 pin 30 Rotating bearing 31 Rotating device 32 pin 33 pin 34 Support member

Claims (1)

[Scope of utility model registration request] 1. An undercarriage body (1), an upper revolving body (2) rotatably mounted on the undercarriage body (1),
A lower boom (4) whose rear end is pivotally connected to the upper revolving structure (2), and an upper boom ( whose rear end is pivotally connected to the front end of the lower boom (4) by a first pin (18)). 6), and an arm (8) whose rear end is pivotally connected to the front end of the upper boom (6) by a second pin (22).
and a bucket (12) connected to the arm (8).
and an upper boom cylinder (5) interposed between the upper boom (6) and the lower boom (4). 20), and a front end pivotally connected to the rear end of the arm (8) by a fourth pin (21); (18) and the third pin (20) is the second pin (20).
2) and the fourth pin (21),
The arm cylinder (7) causes the third pin (2
0) and the fourth pin (21) is the distance between the first pin (21) and the fourth pin (21).
A hydraulic power shovel, characterized in that the length can be equal to the distance between the pin (18) and the second pin (22).