JPH0313158B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a signal transmission device suitable for working machines such as vehicle cranes and shovels.

For example, a vehicle-type crane has a swivel base on its body, and a crane device such as a telescopic boom is disposed on the swivel base.

By the way, in the case of such a crane, due to the structure in which the crane device is disposed on the swivel platform, electric signals are transmitted between the crane device and the vehicle body through a conventionally known rotary joint. It's starting to happen.

Here, to briefly explain this rotary joint, the above rotary joint is arranged coaxially with the rotating shaft of the swivel base, and this rotary joint only transmits electrical signals between the vehicle body side and the swivel base side. It is also used to transmit hydraulic pressure between the vehicle body and the swivel base.

In this way, the rotary joint is used not only to transmit electrical signals but also to transmit hydraulic and electrical signals, so although this rotary joint has traditionally been relatively large, it has recently been used in crane equipment. As control progresses toward computerization, the number of electrical signal transmission lines connecting the vehicle body and the swivel base tends to increase, resulting in the problem of the rotary joint becoming even larger as a whole. be. In addition, among vehicle-type cranes, especially those equipped with a shared operating cab for traveling and crane operation on the swivel base, there is an electric signal system for traveling operation between the vehicle body side and the swivel base side. Since it is necessary to secure a road, the rotary joint has the disadvantage that its structure becomes even more complicated and its size increases.

For this reason, in order to secure the mounting space for the above-mentioned rotary joint in this type of crane, the mounting height of the crane device on the swivel platform becomes higher and higher, and the center of gravity of the entire vehicle type crane also becomes higher. There is a problem.

This invention was made based on these circumstances, and its purpose is to enable signal transmission between the vehicle body side and the swivel base side without passing through the rotary joint. An object of the present invention is to provide a signal transmission device for a working machine that can be downsized.

That is, the present invention forms a signal transmission path connecting the vehicle body and the swivel base by using a lock pin that connects the vehicle body and the swivel base as necessary and prevents the swivel base from turning. It is characterized by:

An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 shows a vehicle-type crane, where 1 is the vehicle body, 2
3 is a swivel base, 3 is a crane device consisting of a telescopic boom 4 etc. arranged on the swivel base 2, 5 is an outrigger that supports the car body 1 during crane work, and 6 is a shared cab that serves both crane work and traveling operation. be. Note that 7 indicated by a broken line indicates a rotary joint for transmitting hydraulic and electrical signals, which is wired concentrically with the pivot axis of the swivel base 2.

The swivel base 2 and the vehicle body 1 are provided between the vehicle body 1 and the swivel base 2 as necessary when it is necessary to prevent the swivel base 2 from turning, for example when driving. A connecting lock pin 8 is provided.

That is, as shown in FIGS. 1 and 2, the lock pin 8 is attached to the swivel base 2, that is, the common cab 6.
The upper plate 11 of the vehicle body 1 has a fitting hole 12 formed at a position corresponding to the turning circle of the guide hole 10. has been done. Therefore, with such a configuration, the swivel base 2 is lowered by lowering the lock pin 8 and fitting its lower end into the fitting hole 12.
and the vehicle body 1, thereby making it possible to prevent the turning base 2 from turning as necessary.

In the case of this embodiment, as shown in FIG. Connector pin 13
A connector socket 14 that can be connected to the connector socket 14 is fitted therein. Here, the connector socket 14 is connected to instruments and switches (not shown) in the shared cab 6 via a cord 15, and the connector pin 13 is located on the vehicle body 1 side and is used only when driving. It is connected via a cord 16 to a sensor (not shown) that detects driving conditions such as vehicle speed. Therefore, with the above configuration, when the vehicle body 1 and the swivel base 2 are connected via the lock pin 8,
The connector socket 14 and the connector pin 13 are connected, thereby forming a large number of electrical signal transmission lines connecting the swivel base 2 side and the vehicle body 1 side via the lock pin 8.

Next, the lock pin 8 engaging/disengaging mechanism 17 will be explained with reference to FIG. As shown in FIG. 5, the upper end of the locking pin 8 is connected to a vertical rod 19 via a coupling 18. This vertical rod 19 extends into the common cab 6, and its upper end is connected to one end of an angular link 21 rotatably supported around a pin 20. The other end of this link 21 is connected to the lower end of a lever 23 via a horizontal rod 22. This engagement/disengagement lever 23 is located near the driver's seat 6a in the shared cab 6, and is pivotably supported around its center. Therefore, in order to disengage the lock pin 8 from the engaged state shown in FIG. 22, link 21, vertical rod 19 and connector 18, the locking pin 8 can be pulled out from the fitting hole 12. Conversely, when inserting the lock pin 8 into the fitting hole 12, after aligning the axes of the fitting hole 12 and the lock pin 8, the above-mentioned engagement/disengagement lever 23 is rotated. Needless to say. In addition, fitting hole 1
2 and the lock pin 8 can be easily aligned by adjusting the rotation position of the swivel base 2 using a known limit switch or the like.

Further, in the case of this embodiment, one of the electrical signal transmission lines is used as a signal transmission line for confirming the engagement and disengagement of the lock pin 8, and this signal transmission line is arranged in the common cab 6. It is connected to the alarm lamp 24.

According to the above embodiment with such a configuration,
In addition to the conventional rotary joint 7, an electric signal transmission path connecting the vehicle body 1 side and the swivel base 2 side is formed through the lock pin 8, so that electric signal transmission that can be transmitted via the lock pin 8 is possible. The number of electric signal transmission lines to be transmitted via the rotary joint 7 can be reduced by the number of lines. Therefore, by making it possible to transmit electrical signals through the lock pin 8, the rotary joint 7 can be made smaller and its structure can be made simpler. As a result, by downsizing the rotary joint 7, the center of gravity of the entire vehicle crane can be lowered, and the crane performance can also be improved.

Furthermore, according to this embodiment, the engagement and disengagement of the lock pin 8 can be confirmed by the warning lamp 24 using one of the electric signal transmission lines formed through the lock pin 8, so that it is possible to check the engagement and disengagement of the lock pin 8 by using the alarm lamp 24, so that it is possible to check whether the lock pin 8 is engaged or disengaged by the warning lamp 24. Therefore, the rotation of the swivel base 2 can be reliably prevented.

Note that the present invention is not limited to the above embodiment. For example, the electrical signal transmission path formed via the lock pin 8 is connected to the connector socket 14.
The optical signal transmission system that connects the vehicle body side and the swivel base side through the lock pin is not limited to the system that is configured using the connector pin 13 and can be easily implemented with various modifications. Channels can also be formed in a similar manner.

In the above embodiment, an example was shown in which the application was applied to a vehicle-type crane, but it is also applicable not only to hydraulic excavators, but also to aerial work vehicles that require signal transmission between the vehicle body side and the swivel platform side, and fire fighting vehicles. It can also be applied to working machines such as automobiles.

As explained above, this invention utilizes a lock pin to prevent the rotation of the swivel base as necessary.
By forming a signal transmission path connecting the vehicle body side and the swivel base side, the rotary joint can be made smaller and the structure simpler, and the center of gravity of the entire working machine can be lowered.
It has various excellent effects.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a partially cutaway side view of a vehicle-type crane, FIG. 2 is an enlarged cross-sectional view of the middle part of FIG. FIG. 4 is a sectional view taken along the line, FIG. 4 is a view taken in the direction of the arrow in FIG. 2, and FIG. 1...Vehicle body, 2...Swivel base, 8...Lock pin, 13...Connector pin, 14...Connector socket.

Claims (1)

[Claims] 1 A swivel base is provided on the vehicle body, and a working device is disposed on the swivel base, and the vehicle body and the swivel base are connected with a lock pin as necessary to prevent the swivel base from turning. In the working machine, when the vehicle body and the swivel base are connected by a lock pin, a signal transmission path connecting the vehicle body side and the swivel base side is formed via the lock pin. Mechanical signal transmission device.