JPH04122769U - Shovel type excavator - Google Patents

Abstract

(57) [Summary] [Configuration] A detection switch is provided below the base end of a boom cylinder on the upper swing machine side, and a detected part is provided at the end of the boom cylinder. Ru. [Effect] The detection switch operates reliably, increasing work safety.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention allows you to replace the attachments and use it for shovel work, loading, transportation, lifting, etc. Items related to shovel-type excavators used for lifting, replacing sleepers, crushing, etc. It is.

0002

[Conventional technology]

Conventionally, this type of shovel-type excavator consists of a lower traveling body and an upper swinging body. The base end of the boom is installed on the upper rotating body of the working machine so that it can be raised and lowered by a support shaft. , a boom cylinder is provided between the boom and the upper revolving body, and a boom cylinder is provided between the boom and the upper rotating body; The arm is arranged so that it can be raised and lowered, and a replaceable bucket etc. can be attached to the arm. It is known that the device is configured with a ment.

0003 However, during work, the swinging motion of the upper revolving machine, the raising and lowering motion of the boom and arm, and Various tasks will be performed through the combined movements of the attachments.

0004 By the way, the above-mentioned raising and lowering movements of the boom and arm and combined movements of the attachment It is strongly required that the operation be safe and secure, and in the unlikely event that an accident occurs, This may not only cause mechanical failure such as damage to the boom, but also damage to adjacent structures depending on the nature of the work. This can lead to damage to property and structures and even personal injury, so special consideration must be given to this. Must be.

[0005] For this reason, when working in a position where electric wires are adjacent to the top, for example, when the machine is raised or lowered, There are some configurations that limit the maximum height of the device and prevent it from rising above that limit. Ru.

[0006] As a means to limit this maximum height, for example, there may be a height between the boom and the upper revolving body. A stopper shaft is installed according to the limit value to prevent the boom from raising or lowering beyond the limit value. If you try to do so, the stopper shaft is a mechanical mechanism that prevents the boom cylinder from protruding. limit switches located above the top of the boom and the base of the arm. When the limit switch detects the maximum height, it sends a signal to the boom control section, A structure that restricts the protruding movement of the boom cylinder to prevent the boom from rising any further. The structure is known.

[0007]

[Problem that the idea aims to solve]

However, in the case of the above-mentioned stopper shaft structure, changing the limit value is troublesome and reduces workability. However, if the structure is equipped with a limit switch, the limit may become low. Since the control signal can be obtained from the switch, automatic control is easy.

[0008] However, with this limit switch structure, the detected part is installed on the boom or arm. Since the detected part is located below the limit switch and the boom When the bearings of the boom and arm wear out due to use, the boom and arm will inevitably lower. This may cause the detected part to move downward from the limit switch. The limit switch operation becomes uncertain, which can lead to major accidents. This has the disadvantage that there is a possibility that

[0009]

[Means to solve the problem]

The purpose of this invention is to solve these inconveniences, and its gist is as follows: The base end of the boom is attached to the upper rotating body of a work machine consisting of a lower traveling body and an upper rotating body. A boom is provided between the boom and the upper rotating body so that the boom can be raised and lowered by a support shaft. An arm is provided at the tip of the boom so that it can be raised and lowered. The system is equipped with replaceable attachments such as buckets, and is attached to the upper rotating body side. A detection switch is installed below the base end of the boom cylinder, and A shovel-type excavator characterized by having a detection part provided at the end of the cylinder for excavation. It's on the machine.

0010

[Effect] Detection installed below the base end of the boom cylinder on the upper swing body side The switch detects the detected part installed at the end of the boom cylinder. , the limit switch sends a detection signal to the boom operation section and prevents the boom cylinder from protruding. Movement will be restricted.

[0011]

【Example】

1 to 4 show an embodiment of the present invention, 1 is a working machine, and a lower traveling machine 1a and an upper rotating body 1b, the upper rotating body 1b rotates to the lower traveling body 1a. It is designed to be able to rotate around the axis 1c by a rotation operation mechanism consisting of a gear mechanism (not shown). The base end of the boom 2 can be raised and lowered by the support shaft 3 on the upper rotating body 1b. A boom cylinder 4 is provided between the boom 2 and the upper rotating body 1b, and the boom An arm 5 is supported at the tip of the boom 2 by an arm shaft 6 so that it can be moved up and down. An arm cylinder 7 is provided between the arm 5 and the arm 5 has a bucket 8a in this case. An exchangeable attachment 8 such as Hydraulically driven crawler tracks 1d, in this case rubber crawlers, are installed on both the left and right sides of the aircraft body 1a. It is configured as follows.

0012 10 is a detection switch, in this case a limit switch is used, and the upper rotation It is located below the base end 4a of the boom cylinder 4 on the rotating machine body 1b side, and is located above the boom cylinder 4. A holding frame 11 is attached to the upper surface of the rotating body 1b, and a detection switch 10 is installed inside the holding frame 11. is provided horizontally movably, and an adjustment screw shaft 12 is provided on one side wall of the holding frame 11. A spring 13 is interposed between the other side wall and the detection switch 10, and the detection switch 10 is connected to the It is connected to a boom operation section 15 by a cord 14.

[0013] Reference numeral 16 denotes a detected part, which is melted and protrudes from the base end 4a of the boom cylinder. being touched.

[0014] Since this embodiment has the above configuration, the swing operation of the upper swing body 1b and the boom system Raising and raising of the boom 2 by the cylinder 4 and the arm 5 by the arm cylinder 7 Various tasks will be performed using the compound movements of attachment 8, and during this task, As the boom 2 moves up and down, the base end 4a of the boom cylinder 4 pivots to the pivot shaft. 4b as the center, and the boom 2 rises above the maximum height as shown in Figure 4. and the contact surface 16a of the detected part 16 presses the actuating roller 10a of the detection switch 10. , As a result, a detection signal is output from the detection switch 10, and this detection signal is sent to the boom. The command is sent to the operation unit 15 to control the protruding movement of the piston rod 4c of the boom cylinder 4. This can limit the maximum height, especially for detection switches. The switch 10 is provided at a position below the base end 4a of the boom cylinder 4, and the detection target 16 is provided at the end of the boom cylinder 4, so the bearings of the boom 2 and arm 5 are If the boom 2 or arm 3 lowers due to wear, the detected part 16 will be removed by the detection switch 10. Since the detected part 16 is located close to the side, the detected part 16 is separated from the detection switch 10. As a result, the limit switch operates reliably, increasing safety. can be done.

[0015] Note that this invention is not only used for excavator work; for example, it can be used for attachment work. Used for loading, transporting, lifting, replacing sleepers, crushing work, etc. by replacing the head 8. The structure of the detection switch 10 can be applied to excavators of excavator type. The structure will be designed with appropriate changes.

[0016]

[Effect of the idea]

As mentioned above, the present invention is capable of restraining the protruding movement of the boom cylinder, and This detection switch can limit the maximum height of the boom cylinder. This detected part is installed at the end of the boom cylinder. Therefore, if the boom or arm bearings wear out and the boom or arm lowers, damage may occur. Since the detection part will be close to the detection switch, the part to be detected will be separated from the detection switch. As a result, the detection switch is activated more reliably and the work is carried out faster. Safety can be increased.

[0017] As described above, the intended purpose can be fully achieved.

[Brief explanation of drawings]

FIG. 1 is an overall side view of an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of the embodiment shown in FIG. 1;

FIG. 3 is a partial side view of the embodiment shown in FIG. 1;

4 is a partial side sectional view of the embodiment shown in FIG. 1 in an operating state; FIG.

[Explanation of symbols]

1 Traveling aircraft 1a Lower traveling aircraft 1b Upper rotating body 2 boom 3 Support shaft 4 Boom cylinder 5 Arm 8 Attachments 8a Bucket 10 Detection switch 16 Detected part

Claims (1)

[Scope of utility model registration request] Claim 1: A base end of a boom is provided on the upper rotating body of a working machine consisting of a lower traveling body and an upper rotating body so as to be movable up and down by a support shaft, and a boom cylinder is provided between the boom and the upper rotating body. An arm is provided at the tip of the boom so that it can be raised and lowered, and the arm is equipped with a replaceable attachment such as a bucket. 1. A shovel-type excavator, characterized in that a detection switch is disposed at the boom cylinder, and a detected portion is provided at an end of the boom cylinder.