JPS6332191Y2 - - Google Patents

Description

[Detailed description of the invention] The invention includes an upper rotating body on the lower traveling body,
The present invention also relates to a safety device for a shovel-type excavator in which running and steering of the undercarriage is carried out by a skid steering system.

Conventionally, the upper revolving body of this type of shovel-type excavator has generally been configured so that the lower traveling body can be locked (restrained) at a specific position with a lock pin to ensure safety during driving. The operation of the system, that is, traveling and steering, can be performed freely regardless of whether or not the upper rotating body is locked by the lock pin.
Therefore, if you do not perform or forget to perform the locking operation using the lock pin, and if the swing lever for the upper revolving structure is operated carelessly or by mistake while driving, the upper revolving structure will rotate, resulting in a serious accident. There is a risk of causing

Note that as a technique similar to the present invention, for example, there is Japanese Patent Publication No. 55-44825, which disables high speed travel when the revolving lock of the upper revolving structure is operated to the lock side, but does not allow high speed travel at low speeds. This system allows the vehicle to run regardless of whether or not the upper revolving structure is locked, so the above-mentioned problem still remains when running at low speeds. In addition, in this publication, a lock pin for locking the upper rotating body to the lower traveling body is connected to an operating lever via a link, and the rotating mechanism moves in conjunction with the movement of the link mechanism when the operating lever operates the swing lock. Since this method operates the stopper of the operating valve, when the operating lever of the swing lock is operated to the lock side,
Even if the lock pin is caught in the middle of the hole and has a poor lock, the stopper may leave the traveling control valve in an operable state.
There was a problem with its reliability.

In view of the above-mentioned conventional problems, the purpose of the present invention is to provide a lock pin for locking the upper rotating body to the lower rotating body, not only for the rotating body but also for locking the skid steering system for traveling and steering. An object of the present invention is to provide a highly reliable safety device for a swing type shovel type excavator that can function and reliably perform a lock function, thereby improving safety during traveling.

Embodiments of the present invention will be specifically described below with reference to the drawings. In the figure, 1 is a small blade 2 on the front side.
The lower traveling body has an outrigger 3 on the rear side, and on the lower traveling body 1, in this embodiment, an upper rotating body 5 equipped with a backhoe 4 is rotated around the vertical axis via a rotating seat bearing 6. It is mounted so that it can rotate.

As shown in FIGS. 1 and 2, on the floor surface of the driver's seat 7 formed on the upper rotating body 5, the upper rotating body 5 is placed at a specific position of the lower traveling body 1, that is, between the lower traveling body 1 and the upper rotating body. A lock pin 8 is provided for locking the vehicle in a running position that is aligned with the body 5 in the longitudinal direction. The lock pin 8 hangs down through the floor plate 9 and is fitted into a cylindrical pin guide 10 formed in the frame of the upper revolving body 5 so as to be movable up and down, and its lower end is attached to the lower traveling body 1. It can be inserted into and removed from a pin hole 11a of an engaging portion 11 formed on the frame. Further, a locking hole 12 formed in the floor plate 9 is provided at the upper part of the lock pin 8.
A locking hook 13 is provided to hold the lock pin 8 in a released position where it has been removed from the engagement portion 11 by engaging with the lock pin 8. When the lock pin 8 is inserted into the engagement portion 11, It descends through a relief groove 14 formed in the floor plate 9 and can be locked to the upper edge of the pin guide 10.

Furthermore, on the upper revolving body 5 side, two control levers 15 for the left wheel and the right wheel are arranged on the floor surface of the driver's seat 7 so as to be tiltable forward and backward.
is the steering link mechanism 16 as shown in FIG.
It is linked to the trunnion levers 18 of the variable displacement hydraulic pumps 17 for the left and right wheels via. That is, the hydraulic pump 17 is connected in tandem with an engine (not shown) in the engine room of the upper revolving structure 5, and the oil discharge amount and oil flow direction can be individually controlled by tilting the control lever 15. The swash plate angle is always maintained at a neutral position where the swash plate angle is 0 by a neutral holding device (not shown). Note that the oil discharged from the hydraulic pump 17 is supplied to a wheel drive hydraulic motor (not shown) provided on the lower traveling body 1 side to operate the motor.

In the swing-type shovel-type excavator constructed as described above, the lock pin 8 and the steering link mechanism 16 are linked by a steering lock mechanism 19 as shown in FIG. 4. The steering lock mechanism 19 is a swing lever 2 which is swingably mounted on the frame of the upper swing body 5 via a stand pin 20 around a vertical axis.
1, a flanged connecting pin 23 connected to one end of the swing lever 21 via a pin 22, and a pin 23 connected to a three-pronged portion formed at the other end of the swing lever 21.
Two long and short locks connected via 4
5. The link pin 23 is slidably fitted into the pin guide 10 of the lock pin 8 from a direction perpendicular to the axis of the cylindrical hole so that its spherical tip end protrudes into the cylindrical hole of the pin guide 10, and can be pushed out by the lock pin 8 when the lock pin 8 is inserted into the engagement portion 11. Meanwhile, the two lock rods 25 are supported slidably in the horizontal direction by rod guides 26 erected on the frame, and their tips can be inserted and removed into holes in lock brackets 28 provided on the left and right steering rods 27 of the steering mechanism 16. A lock spring 29 is stretched between the swing lever 21 and the rod guide 26, and the lock spring 29
The pivot lever 22 is rotated in a direction in which the connecting pin 23 is inserted into the cylindrical hole of the pin guide 10, i.e., in a direction in which the lock rod 25 is inserted into the lock bracket 28.
1 is energized.

This embodiment is configured as described above,
Therefore, when the lock pin 8 for fixing the revolving body is removed from the engaging portion 11 of the lower traveling body 1 as shown by the solid line in FIG. 2, the lock spring 29 is removed as shown by the solid line in FIG.
Due to the action of
Since it is inserted into the hole No. 8, the movement of the steering system is locked. On the other hand, when the lock pin 8 is inserted into the pin hole 11a of the engaging portion 11 as shown by the imaginary line in FIG. In order to swing the steering rod against the force, each lock rod 25 is removed from the lock bracket 28 of the steering rod 27 to allow movement of the steering system. That is, when the revolving upper structure 5 is free to turn, the movement of the travel/steering system can be locked, and when the revolving upper structure is locked, the travel/steering system can be set in a free state.

Note that the steering lock mechanism 19 is not limited to the type shown in the drawings and can be modified as appropriate.The key point is that the steering lock mechanism 19 operates in conjunction with the insertion and removal operations of the lock pin 8 for fixing the revolving body to control the steering system. There is no problem as long as it can lock and release the lock.

As described in detail above, the present invention provides a shovel type excavator which is provided with an upper revolving body on a lower traveling body, and in which traveling and steering of the lower traveling body is performed by skid steering system. A directly manually operated locking pin provided on the upper revolving structure side and capable of being inserted into and removed from an engaging portion formed on the lower vehicle body in order to lock the vehicle at a specific position on the lower vehicle body, and an opening provided in the floor plate. A locking hook provided on the lock pin for holding the lock pin in the locked position and the released position, and a pin guide provided on the upper revolving body side to guide the lock pin, intersecting the insertion direction of the lock pin. a connecting pin that is slidably provided in a direction in which the lock pin is inserted and is pushed out when the lock pin is inserted and is held in the pushed out position by one end abutting the outer periphery of the lock pin; a steering lock mechanism that is operated to the release side to set a steering system for operating each of the hydraulic pumps in a free state when the connecting pin is pushed out;
The steering lock mechanism is actuated to the lock side to lock the steering system when the lock pin is removed from the engaging portion, and a spring means is provided for returning the connecting pin to an initial position relative to the pin guide. As a result, the lock pin for locking the revolving body and the steering link mechanism are linked via the steering lock mechanism, so that the revolving body can run only when the upper revolving body is locked to the lower traveling body. Therefore, according to the present invention, it is possible to prevent the occurrence of accidents caused by careless or erroneous turning operations of the upper revolving structure while driving, which are problems in the conventional art, and also to prevent the upper revolving structure from turning in a free turning state. The system securely holds the steering system in a neutral position and prevents careless driving at low or high speeds during excavation work, and is extremely effective in ensuring safety during driving and work.

In particular, the present invention has a structure in which the connecting pin is pushed out only when the locking pin is inserted into the engaging portion, in order to prevent the steering system from being unlocked unless the upper rotating body is locked. Therefore, there is no malfunction and its reliability is extremely high. Furthermore, in the present invention, the locking pin is provided with a locking hook that can pass through the opening in the floorboard, so that the locked position and the released position of the locking pin are distinct, making it easy to confirm the locked state of the locking pin. be able to.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a schematic side view showing a revolving shovel type excavator, Fig. 2 is a vertical cross-sectional view showing the lock pin for fixing the revolving body and its surroundings, and Fig. 3 is a schematic side view showing a revolving excavator. FIG. 4 is a perspective view showing the steering system, and FIG. 4 is a perspective view showing the steering lock mechanism. 1... Lower traveling body, 5... Upper revolving body, 8...
Lock pin, 10... Pin guide, 11... Engaging portion, 15... Control lever, 16... Steering link mechanism, 19... Steering lock mechanism,
21... Swing lever, 22... Linking pin, 25...
...Rotsukurotsudo.

Claims (1)

[Scope of utility model registration request] In addition to equipping the upper rotating body on the lower traveling body, there are two wheels, one for the left wheel and one for the right wheel, which are driven by the engine.
In a swing type shovel type excavator equipped with a skid steering device that travels and steers by individually controlling the oil discharge amount or oil flow direction of each hydraulic pump and operating the corresponding hydraulic motor, In order to lock the rotating body at a specific position on the lower traveling body, a directly manually operated lock pin provided on the upper rotating body side and capable of being inserted into and removed from an engaging portion formed on the lower traveling body, and a lock pin provided on the floor plate. A locking hook provided on the lock pin for allowing passage through the opening and holding the lock pin in a locked position and a released position, and a pin guide provided on the upper rotating body side to guide the lock pin in the insertion direction of the lock pin. A connecting pin that is slidably provided in a direction intersecting with the lock pin and is pushed out when the lock pin is inserted and is held in the pushed out position by one end abutting the outer periphery of the lock pin, and is connected to the connecting pin via a link mechanism. a steering lock mechanism that is operated to the release side to free the steering system that operates the hydraulic pumps when the connecting pin is pushed out, and a steering lock mechanism that is operated to the lock side when the lock pin is removed from the engaging portion. A safety device for a swing type shovel type excavator, comprising a spring means that is actuated to lock a steering system and return the connecting pin to an initial position relative to a pin guide.