JP2002309610A - Swing device for attachment of construction machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a swing device for an attachment of construction machinery, which is provided with a brake mechanism dispensing with a separate power mechanism, preventing a braking force from varying due to abrasion of a slidable contact member, and preventing a base part or a swing part from being deteriorated and damaged with time. SOLUTION: In the swing device 1 for the attachment 2 mounted on an arm of the construction machinery, a turning rack 9 is provided in one of the base part 5 and the swing part 6, which are swingably coupled together, and a braking gear 3 is provided in the outer one of them. The braking gear 3, which makes turning regulated in a damping direction by a turning regulating force, is meshed with the turning rack 9 so as to regulate a swing of the swing part 6 with respect to the base part 5 and prevent the swing in the user of the attachment 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swivel device for an attachment used in a construction machine, which achieves both adjustment of a swivel amount by a free swivel method (or a turning) and prevention of a swivel when the attachment is used.

[0002]

2. Description of the Related Art Attachments (for example, crushing claws) used in construction machines are connected to a main body arm via a powered or non-powered turning device so that they can be turned and used as needed. The powerless turning device has a mechanism for limiting the turning amount of the attachment inside, and allows a fixed amount of turning by, for example, a collision force obtained by hitting the attachment against a wall or the like at the site. Such an attachment turning method is referred to as a "free turning method (no power = turning free)" or "applying (" applying "the attachment to a wall or the like" and "turning" the attachment). The structure of the turning device is simplified, an operation method for intuitively turning the attachment without requiring additional power is preferred, and it is still frequently used.

[0003] A turning device used for abutment presses a turning-limited member so as to intermittently engage a turning portion and a base and a turning portion which are connected in a turning direction. This is a configuration that restricts turning. For example, there is a configuration (notch type) in which a metal ball (a turning limitation member) is pressed by a spring extending from a base toward a turning portion, and the metal ball is fitted into a fitting hole provided in the turning portion. In this notch formula,
Since the rotation stop position of the attachment is limited to the interval between the fitting holes or the fitting holes are intermittently arranged in the circumferential direction,
In addition to the drawback that the metal ball rubs against the sliding surface of the turning portion between the fitting holes when the turning portion is turned, the base surface or the turning portion deteriorates with time, and in some cases, there is a problem of causing breakage, Improvement is desired.

As a solution to the above problem, for example, Japanese Patent Application Laid-Open No. Hei 10-237901 discloses a technique using a hydraulically driven brake cylinder as the sliding contact member. Rather than constantly generating a frictional force structurally, the brake cylinder is operated when necessary to generate a frictional force, thereby preventing deterioration or breakage of the base portion or the turning portion with time. In addition, since the brake cylinder is operated appropriately, there is an advantage that it is not necessary to be concerned about a change in frictional force due to abrasion of the cylinder end in sliding contact.

[0005]

The advantage of turning the attachment by contacting is that a separate power mechanism is not required only for turning the attachment. From this point of view, JP-A-10-237901 discloses that a hydraulic pipe (power mechanism) is required for a braking mechanism, and a manual operation system and a control associated with automation are required to realize generation and release of frictional force. A system is required, and there is a problem that the device configuration is complicated.

Therefore, (1) a simple structure that does not require a separate power mechanism, (2) a braking mechanism that does not require a manual operation system or a control system accompanying automation, of course, but (3) In order to develop a turning device equipped with a braking mechanism that does not cause fluctuation of the braking force due to wear of the sliding contact member and deterioration or breakage of the base portion or the turning portion over time, the present invention has been studied.

[0007]

SUMMARY OF THE INVENTION What has been developed as a result of the study is a pivoting device for an attachment to be attached to an arm of a construction machine, in which a revolving rack is braked on one of a pivotally connected base and a revolving part and a revolving rack is braked on the other. A gear is provided, and the braking gear restricts the rotation in the damping direction by the rotation restricting force. By meshing the braking gear with the orbiting rack, the turning of the turning portion with respect to the base and the use of the attachment when using the attachment are used. This is a turning device for an attachment of a construction machine for preventing turning.

The turning device of the present invention does not constitute a braking mechanism that works directly from one of the base and the turning portion in a relative turning relationship to the other, but engages with a revolving rack provided on the base or the turning portion. A turning restriction force is applied to the braking gear to indirectly restrict turning and prevent turning. The orbiting rack may be configured to be provided on the outer surface of a swivel joint provided at the center of the base or the swiveling part to circumscribe the braking gear, or conversely, may be provided on the inner surface of the outer peripheral wall of the base or the swiveling part to inscribe the braking gear. . For example, when the braking gear is assigned to the revolving unit and the revolving rack is assigned to the base, the braking gear having the revolving shaft provided at the base is pinioned to circumscribe or mesh with the revolving rack.

The rotation limiting force of the braking gear may be generated in any manner as long as the rotation is restricted in the damping direction. The internal friction force generated by pressing against the receiving-side friction plate that is not linked to the braking gear is defined as the rotation restricting force. The internal friction force is
The kinetic energy of the braking gear due to the rotation is converted into heat or sound, and the rotation can be regulated in the damping direction. The purpose of this internal frictional force is only to restrict the rotation of the brake gear, and does not directly act on the base portion or the turning portion. Therefore, there is an advantage that deterioration or breakage due to wear does not occur.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway front view of a large splitting machine (attachment) 2 to which a turning device 1 of the present invention is applied.
FIG. 2 is a plan view of the turning device 1, and FIG. 3 is a cross-sectional view illustrating an example of an internal structure of the braking gear 3. The turning device 1 of the present invention
Attachment 2 requiring turning, as seen in FIG.
The base 5 is connected to the arm 4, and the turning part 6 is connected to the attachment 2 as a connection part for attaching to the arm 4.
Hydraulic piping to the attachment 2 is provided through a swivel joint 8, and a guard 7 for protecting the cylinder of the attachment 2 is attached to the outer surface of the turning part 6.

The turning device 1 has a structure in which a base 5 and a turning portion 6 are connected via a swivel joint 8. The turning portion 6 to which the attachment 2 is attached turns around a virtual turning axis defined in the swivel joint 8. I do. In this example,
A revolving rack 9 is engraved on the inner surface of the outer periphery of the revolving portion 6, and the braking gear 3 fixed to the base 5 meshes with the revolving rack 9. Although only one brake gear 3 is provided as shown in FIG. 2, a plurality of brake gears 3 may be provided.

As shown in FIG. 3, the braking gear 3 includes a rotating friction plate 11 which rotates in conjunction with the braking gear 3 and a spring.
It is pressed by 12 and is in pressure contact with the receiving friction plate 13 which is not linked to the braking gear 3. The receiving-side friction plate 13 may be fixed to the gear case 14, but in this example, the receiving-side friction plate 13 is rotatably incorporated in the gear case 14 by interposing a spacer 15 with respect to the gear case 14. are doing. In this case, a receiving-side friction plate may be interposed between the multilayer rotating friction plates, and the whole may be pressed by a spring to generate an internal friction force.

The rotating friction plate 11 is constantly pressed against the receiving friction plate 13 by a spring 12 to generate an internal frictional force. When the braking gear 3 starts to rotate, it becomes a rotation regulating force and rotates. The movement is regulated in the damping direction. In other words, this internal frictional force regulates or prevents the turning of the revolving rack 9 meshing with the braking gear 3 and thus the turning portion 6. 2, the braking gear 3 (pinion) is small relative to the orbiting rack 9, and it is difficult to move the orbiting rack 9 by rotation of the braking gear 3. That is, the attachment 2 does not turn without permission due to the displacement of the arm 4 side. In this manner, by allocating the braking gear 3 to the base 5 and the revolving rack 9 to the turning portion 6, it is possible to reliably prevent the turning portion 6 from turning.

Basically, the turning device 1 according to the present invention comprises a base 5
However, since the turning portion 6 is not completely fixed, the turning device (attachment) 2 can be turned freely with a free turning amount. However, if the kinetic energy for turning does not exceed the turning restriction force for turning control or prevention by the braking gear 3 = the internal frictional force, turning is not allowed. The degree of impact force that allows the vehicle to turn can be adjusted by the rotation restricting force of the brake gear 3, and in this case, the magnitude of the internal friction force.

As described above, since the turning device 1 of the present invention has only a mechanism for restricting or preventing turning and no other mechanism for restricting or preventing turning, the turning amount of the turning portion with respect to the base is continuous. Thus, the turning direction and the turning amount desired by the operator can be obtained. Since the braking gear according to the present invention restricts and prevents excessive turning and easy turning, the action or effect is not impaired even if the turning angle or turning direction is separately controlled.

[0016]

The swivel device according to the present invention has the following simple features: (1) It does not require a separate power mechanism. This means that no hydraulic piping or other power supply lines are required for the swivel device, which has the effect of eliminating restrictions on the use of the swivel device of the present invention. As a result, (2) naturally, a manual operation system and a control system accompanying automation are not required. That is,
The attachment can be turned by intuitive hitting in the past. The maintenance may include maintenance of the braking gear or replacement of a member that generates a rotation restricting force. However, it is also possible to replace the braking gear integrally. The operation of replacing the brake gear is very easy, and brings about an advantage that the cost can be kept within a practical range.

Further, (3) a braking mechanism is provided which does not cause fluctuation of the braking force due to wear of the sliding contact member and deterioration or breakage of the base portion or the turning portion over time. This is an effect that the braking action is not provided directly to the base portion or the turning portion, but is exerted indirectly through a braking gear, unlike the conventional technology. In other words, the braking gear
The internal structure can be specified so as to exert the rotation restricting force. For example, even when the internal friction force is used, a dedicated friction plate that generates the internal friction force can be used.

(4) The present invention has an effect of realizing continuous turning which is impossible with the conventional notch type. In the notch type, since the engagement between the metal ball and the fitting hole is used, the turning amount is necessarily restricted to the position of the fitting hole. On the other hand, in the present invention, there is no member that intermittently limits the turning amount, and the turning direction and the turning amount desired by the operator can be obtained. This is the effect of the present invention that the working efficiency is improved in practical use.

[Brief description of the drawings]

FIG. 1 is a partially broken front view of a large splitting machine to which a turning device of the present invention is applied.

FIG. 2 is a plan view of the turning device.

FIG. 3 is a cross-sectional view illustrating an example of an internal structure of a braking gear.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Swivel device 2 Large split machine (attachment) 3 Brake gear 5 Base 6 Swivel unit 8 Swivel joint 9 Orbiting rack

Continued on front page F-term (reference) 2D012 DA02 HA01 3F205 AA07 EA01 3J009 DA16 EA04 EA05 EA14 EA21 FA02 FA30 3J058 AA43 AA47 AA53 AA58 AA79 AA87 BA46 CC07 FA50

Claims (2)

[Claims] 1. A swinging device for an attachment mounted on an arm of a construction machine, wherein a swing rack is provided on one of a base portion and a swinging portion which are swingably connected, and a braking gear is provided on the other, and the braking gear has a rotation limiting mechanism. The rotation is regulated in a damping direction by a force, and the braking gear is meshed with the orbiting rack to restrict the turning of the turning portion with respect to the base and to prevent the turning when the attachment is used. Swivel for attachment. 2. The rotation restricting force is an internal friction force generated by pressing a rotating friction plate that rotates in conjunction with a braking gear against a receiving friction plate that does not interlock with the braking gear. The turning device for attachment of a construction machine according to the above.