JPH0824459B2 - Work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention removably connects a work device that can move up and down to a machine body, and flexibly connects the machine body side device and the work device side device. The present invention relates to a work vehicle connected by a link member.

[Conventional technology]

As flexible linking members for connecting related equipment on the machine body side and the working device side, there are electric cords, operation wires, hydraulic hoses, etc., and the working device is removed from the machine body for storage and replacement of the working device. When moving, the operation of separating the flexible linking member may be forgotten, and the flexible linking member may be damaged or the working device may be dragged by moving the machine body by forgetting this separating operation. There was a risk of falling.

Therefore, as an example of means for preventing such a problem, when the flexible linking member is an electric cord, for example, as shown in Japanese Utility Model Laid-Open No. 62-169905, At the connection part of the device, form terminals of electric wires on both the work vehicle side and the work device side so that the work device is attached / detached and at the same time electrical connection and disconnection between the work vehicle side and the electric devices on the work device side are performed. There was one configured.

[Problems to be Solved by the Invention]

Although the above-mentioned means is effective in preventing the disconnection of the electric cord, it has some difficulties in practical use. In other words, some errors are tolerated, and the connecting and disconnecting work of the working device that requires a large amount of force when attaching and detaching and the connecting part of the electric cord that requires a strict connection state and is prone to failure due to external force should be performed simultaneously. Therefore, there are various problems in practical use, such as poor contact due to exposure of the contact at the connection portion and increase in frequency of failure of the contact portion due to mechanical load applied when attaching and detaching the work device.

In view of the above situation, an object of the present invention is to prevent a failure or damage from occurring in a flexible linking member that links a work vehicle-side device and a work device-side device by a practical method.

[Means for solving the problem]

A characteristic configuration of the present invention for achieving the above-mentioned object is to provide a sensor for detecting that the working device is in a non-connected state with respect to the machine body at a connecting portion of the working device, and to provide the flexible linking member. When the sensor detects a non-connected state in a state in which is connected, an engine stop means for automatically stopping the airframe-mounted engine is provided.

[Action]

According to the above configuration, when the work device is replaced with another work device or when the work device is detached and the vehicle travels on the road, the sensor detects the unconnected state of the work device with the flexible linking member connected. Then, the engine stopping means operates to automatically stop the engine.

〔The invention's effect〕

Therefore, according to the present invention, it is possible to prevent the situation in which the machine body is moved while the flexible linking member is still connected, and it is possible to reliably avoid damage to the flexible linking member. In particular, since the connection of the flexible linking member is independent of the linking of the working device, the durability, accuracy, and sealability suitable for the linking form can be set arbitrarily, which is practically effective.

〔Example〕

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

As shown in FIG. 4, the engine (E) is mounted on the front part of the airframe (A) including the control section (1) and the front and rear wheels (2), (3), and the engine (E) is mounted on the rear end of the airframe (A). A link mechanism (5) that can be driven up and down by a hydraulic cylinder (4) is connected, and a multi-row seedling stand (6) is provided at the rear end of the link mechanism (5).
A seedling planting device (9) as a working device equipped with a float (7) and a planting mechanism (8) is detachably connected to the link mechanism (5) so as to form a four-row plant, which is one of the working machines. It is a passenger type rice transplanter.

As shown in FIGS. 3 and 4, a marker device (M) is provided at the lower front portion of the machine body (A). This marker device (M) is used to leave a space for full-row planting, which connects headlands on both sides of the field after reciprocal planting, on the ridge during the first planting process, and in the central part (10a). A bendable marker arm (10) is slidably attached to a pair of left and right rotation support parts (11) at the lower front part of the machine body. During normal planting, both ends of the marker arm (10) folded as shown in FIG. When leaving the above space during the attachment process, move the center part (10a) of the marker arm (10) to the straight line connecting the left and right rotation support parts (11) as shown in Fig. 3 (b). While extending in a straight line to the left and right, slide the marker arm (10) in either direction to the limit while keeping the straight extension state, and perform the first planting process with the tip of the marker arm (10) along the ridge. Thus, the space (S) for planting 4 rows can be left on the edge side.

Next, the structure of the connecting portion (B) between the link mechanism (5) and the seedling planting device (9) will be described.

As shown in FIG. 1, the connecting portion (B) is a vertical link (12) at the rear end of the link mechanism (5), a hook (13) protruding rearward from the upper part of the link mechanism, and a seedling planting device (9). Side coupling frame (14) and a locking tool (15) provided in the coupling frame (14), and the hook (13) is formed in an upper portion of the coupling frame (14) with an engaging hole ( 16) can be engaged and the lock tool (15) can be attached to the lock pin (17) of the vertical link (12) to attach and detach the seedling planting device (9) to the rear end of the link mechanism (5). It is designed to be connected to.

Then, as shown in FIG. 2, a limit switch (Sw) provided on the seedling planting device (9) side as a seedling remaining amount sensor for each row of the seedling stand (6) and a main unit (A) side. The power source (B) and the alarm circuit (20) provided in the above are connected by an electric cord (an example of a flexible linking member) (21). In the figure, (22) is a warning mechanism such as a buzzer or a lamp connected to the alarm circuit (20).

In the middle of the electric cord (21), a connector (C) is provided to disconnect the electrical system when removing the seedling planting device (9) from the machine body (A). The female joint (Cb) belonging to the seedling planting device (9) side of the connector (C) is provided with a pair of terminals (23a), (23b) that are electrically connected to each other, and the terminals (23a), One of the connection pins (24a) and (24b) (24a) provided on the male joint (Ca) belonging to the fuselage (A) side corresponding to (23b) has a relay for controlling the engine stop circuit (25). (Ry) is connected, and the other connection pin (24b) is connected with a normally closed switch (26) as a sensor for detecting the connection state of the connection portion (B).

As shown in FIG. 1, the switch (26) is attached to the vertical link (12) of the link mechanism (5) and is pressed by the connecting frame (14) of the seedling planting device (9). It is configured so that it is opened when the seedling planting device is connected and closed when it is not connected.

Therefore, if the connector (C) is still connected when the seedling planting device (9) is removed from the link mechanism (5), the relay (Ry) is energized by the closing of the switch (26) and the engine stop circuit is closed. (25) is activated. That is, it becomes impossible to drive only the machine body (A) with the connector (C) being connected.

Further, when the seedling planting device (9) is removed and the connector (C) is separated, the relay (Ry) and the engine stop circuit (25) do not operate even when the switch (26) is closed. Thus, it becomes possible for the aircraft (A) to travel.

In the embodiment, the case where the flexible linking member (21) extending over the machine body (A) and the working device (9) is an electric cord is illustrated, but the same function as the connecting portion of the operation wire and the hydraulic hose and the coupling. It is also possible to implement by giving. Further, as the sensor (26) for detecting the connection state of the connection portion (B),
In addition to the limit switch, various types of detecting means such as a proximity switch, a reed switch, and a photo interrupter can be used.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of a work vehicle according to the present invention. Fig. 1 is a partially cutaway side view showing a connecting portion of a seedling planting device, Fig. 2 is an electric circuit diagram, and Fig. 3 (a), ( (B) is a schematic plan view of the marker device, (a) shows a normal planting state, and (b) shows a ridge planting state. FIG. 4 is an overall side view. (9) …… Working device, (21) …… Flexible linking member, (2
6) …… Sensor, (A) …… Airframe, (B) …… Connecting part,
(E) …… Engine.

Claims (1)

[Claims] 1. A vertically movable working device (9) is detachably connected to a machine body (A), and a flexible linkage is provided between the machine body (A) side device and the work machine (9) side device. Material (2
In the work vehicle connected in 1), a sensor (26) for detecting that the working device (9) is in a non-connected state with respect to the machine body (A) is connected to the working device (9). The engine stop means is provided in the section (B) and automatically stops the airframe-mounted engine (E) when the sensor (26) detects the unconnected state with the flexible linking member (21) connected. A working vehicle.