JPH0512484U - Anti-rotation structure of swivel work machine - Google Patents

Abstract

(57) [Summary] [Purpose] While avoiding the loss of the detent pin and forgetting the storage position with certainty, damage to the bracket and failure of the drive mechanism due to turning in the detent state with the detent pin inserted To avoid. [Structure] The swivel frame 4 is provided on the machine body frame 3 so as to be rotatable around a vertical axis, and an electric motor 6 for driving and rotating the swivel frame 4 is provided, and a rotation stop pin 11 is provided on the swivel frame 4 and the machine body frame 4. The first and second brackets 13 and 14 to be inserted are provided, and the body frame 3
A pin housing portion 12 for housing the detent pin 11 is attached thereto, and a limit switch 15 is attached to the pin housing portion 12, and only when it is detected that the detent pin 11 is in the accommodated state, the electric motor 6 It is configured to allow the operation of and to turn.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention provides a revolving frame equipped with a working device, such as a crane or an excavator, on a machine body frame so as to be rotatable around a vertical axis, and a drive mechanism for driving and rotating the revolving frame. The present invention relates to a rotation-preventing structure for a swing-type working machine in which a frame and a bracket for inserting a rotation-preventing pin are provided.

[0002]

[Prior Art]

 This kind of structure prevents the unexpected turning by mechanically locking the turning frame equipped with the working device to the machine frame by inserting the anti-rotation pin when moving the work machine by traveling the machine. To improve safety.

[0003]

[Problems to be solved by the device]

 However, in the past, when forgetting to remove the detent pin when turning during work, the drive mechanism unexpectedly actuated and damaged the bracket even though the detent pin was inserted into the bracket. When an electric motor is used as the drive mechanism, there was a drawback that the electric motor would be forced and burned out.

When the detent pin is pulled out, the detent pin is placed on the revolving frame or brought into the control box, and when the detent pin is next tried, the detent pin is removed. There were some drawbacks, such as having to search for it and sometimes losing the detent pin.

The present invention has been made in view of such circumstances, and surely avoids the loss of the detent pin and forgetting the storage position, and the detent state with the detent pin inserted. It is intended to prevent damage to the bracket and failure of the drive mechanism due to turning of the.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a swing frame equipped with a working device on a machine frame so as to be rotatable around a vertical axis, and a drive mechanism for driving and rotating the swing frame. In a rotation-preventing structure for a revolving work machine in which a bracket for inserting the rotation-prevention pin is provided on the frame and the machine frame, a pin housing portion for accommodating the rotation-prevention pin is attached to the machine frame or the revolving frame. A sensor is installed in the pin housing to detect that the detent pin is in the retracted state, and a safety mechanism that allows the drive mechanism to operate only when the sensor detects the retracted state of the detent pin is attached. Configure.

[0007]

[Action]

 According to the structure of the rotation preventing structure of the swing type working machine of the present invention, not only the rotation preventing state where the rotation preventing pin is inserted into the bracket but also the state where the rotation preventing pin is not housed in the pin storing portion even when it is removed from the bracket With, the swivel frame cannot be swiveled, and the swivel frame can be swiveled only when the anti-rotation pin is stored in the pin storage part.

[0008]

【Example】

 Next, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an overall side view of a tilting jib type crane as an example of a swing type working machine adopting a detent structure according to the present invention, FIG. 2 is an enlarged side view of a main part, and FIG. 3 is a main part. FIG. 3 is an enlarged plan view of the vehicle body frame 3 having traveling wheels 1 ... and outriggers 2 ... and a swing frame 4 rotatably provided around a vertical axis.

A jib 5 is provided on the swivel frame 4 so as to be capable of undulating about a horizontal axis, and a forward / reverse electric motor 6 for swiveling and a jib 5 are provided on the swivel frame 4 for undulating. A hoisting winch 7 and a hoisting winch 9 for raising and lowering a hook 8 as a working device are provided.

As shown in an enlarged side view of an essential part of FIG. 2 and an enlarged plan view of an essential part of FIG. 3, a detent pin 11 is connected to a predetermined portion of the machine body frame 3 via a chain 10. Then, a cylindrical pin housing portion 12 for housing the rotation stopping pin 11 and a cylindrical first bracket 13 for rotation prevention are attached. On the other hand, a second bracket 14 having a pin hole for rotation prevention is attached to a predetermined position of the swivel frame 4, and the swivel frame 4 is swung to a predetermined position with respect to the machine body frame 3 so that the first and second The brackets 13 and 14 of No. 2 are made to correspond to each other, the locking pin 11 is inserted therein, and the retaining pin 11a is also inserted, whereby the turning frame 4 is mechanically locked to the body frame 3 and the turning can be prevented. Is configured.

As shown in the enlarged side view of the main part of the pin accommodating portion 12 shown in FIG. 4 showing the condition in which the detent pin 11 is accommodated in the pin accommodating portion 12, as shown in FIG. A limit switch 15 is provided as a sensor for detecting that the detent pin 11 is in the housed state so that the tip of the limit switch 15 acts for turning as shown in the circuit diagram of FIG. It is inserted in the middle of the power supply circuit for driving the electric motor 6.

That is, in the middle of the circuit connecting the electric motor 6 and the battery 16, forward / reverse rotation changeover switches 18, 18 which are switched by the turning operation lever 17 are interposed, and by the turning operation of the turning operation lever 17, The swing frame 4 is configured to be switched between a normal rotation state in which it rotates normally, a reverse rotation state in which it rotates in reverse, and a neutral stop state, and a limit switch 15 is connected in series with the battery 16 to form a safety mechanism. ing.

With this configuration, when the rotation stopping pin 11 is not housed in the pin housing portion 12, the limit switch 15 is opened, and the forward / reverse rotation changeover switches 18, 18 are closed in either the normal rotation state or the reverse rotation state. However, the electric motor 6 is not energized, and the turning frame 4 cannot be driven and turned. On the other hand, when the detent pin 11 is accommodated in the pin accommodating portion 12, the limit switch 15 is closed by the contact with the detent pin 11 so that the drive frame of the revolving frame 4 can be switched. Is becoming

As the above-mentioned sensor for detecting that the detent pin 11 is in the housed state, for example, the tip of the housed detent pin 11 that protrudes downward from the pin housing 12 is sandwiched. Various sensors can be employed, such as providing a light projecting portion and a light receiving portion of an optical sensor at a position and detecting the housed state of the detent pin 11 by blocking the detent pin 11.

In the above embodiment, the revolving frame 4 is driven and revolved by the electric motor 6, but various drive mechanisms such as drive and revolving by a hydraulic motor can be applied as the present idea.

In the above-described embodiment, the detent pin 11 is connected to the machine body frame 3 side and the pin housing 12 is provided on the machine body frame 3 side. It may be provided.

Further, the present invention is not limited to the tilted jib type crane as in the above-described embodiment, but can be applied to various swing type working machines such as an auger machine equipped with an excavator and a backhoe.

[0019]

[Effect of the device]

 According to the swivel stop structure of the swivel work machine of the present invention, the drive mechanism operates when the swivel pin is pulled out from the bracket and is not stored in the pin storage portion when the rotation stop state is changed to the swivel work state. Since the swivel frame cannot be swung, the whirl-stop pin must always be stored in the pin housing during swivel work, and the whirl-stop pin can be lost or the storage location can be forgotten. This can be avoided without fail and is extremely useful in practice.

Moreover, since the swivel frame cannot be swung in the rotation stop state in which the rotation stop pin is inserted into the bracket, the bracket may be damaged due to an unexpected swing operation when the rotation stop pin is forgotten to be removed, or the motor may be damaged. The failure of the drive mechanism, such as the burnout, can be reliably avoided and the durability can be improved.

[Brief description of drawings]

FIG. 1 is an overall side view of a tilting jib type crane as an example of a swing type working machine adopting a detent structure according to the present invention.

FIG. 2 is an enlarged side view of a main part.

FIG. 3 is an enlarged plan view of a main part.

FIG. 4 is an enlarged side view of a main part showing a housed state of a rotation stop pin.

FIG. 5 is a circuit diagram.

[Explanation of symbols]

 3 ... Airframe frame 4 ... Revolving frame 6 ... Electric motor as drive mechanism 8 ... Hook as working device 11 ... Detent pin 12 ... Pin housing 13 ... First bracket 14 ... Second bracket 15 ... As sensor Limit switch

Claims (1)

[Scope of utility model registration request] 1. A revolving frame provided with a working device is provided on a machine body frame so as to be rotatable around a vertical axis, and a drive mechanism for driving and rotating the revolving frame is provided, and a revolving frame is provided on the revolving frame and the machine body frame. In a whirl-stop structure of a swivel type working machine provided with a bracket for inserting a stop pin, the machine frame or the swivel frame is provided with a pin housing portion for housing the whirl-stop pin, and the pin housing portion is provided with A sensor for detecting that the stop pin is in the housed state is provided, and a safety mechanism that allows operation of the drive mechanism only when the housed state of the rotation stop pin is detected by the sensor is additionally provided. Anti-rotation structure for swiveling work machines.