JPH0328090A - Work sensing signal transmitting device for working vehicle - Google Patents

Abstract

PURPOSE:To have high reliability transmission of signals and prevent malfunction by sending signals from a transmitting means on the working part side to a signal receiving means on the mobile machine side by means of aerial propagation, and arranging these transmitting and receiving means with a gap interposed so as to be facing at a hitch mechanism part. CONSTITUTION:Because an aerial propagation unit incl. a signal transmitter 22 and receiver 23 is installed at a hitch fitting/removing part in a four-point hitch mechanism 2, it 2 can be used as a protection member for a signal transmitting/receiving unit without any modification for application, and it is also practicable to effectively utilize the dead space between the working part 3 and the mobile machine concerned 1. Because it becomes also practicable to arrange the transmitter 22 and receiver 23 as facing each other in proximity, a transmitter and receiver with excellent directionality can be mounted, and even though they 22, 23 are with lesser power consumption and minor output, such inconvenience as transmission of erroneous signal due to crosstalk or input of an external signal will be eliminated, which is likely in the case of signal transmission through aerial propagation. This enables signal transmission with high reliability, which should eliminate malfunction.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a work detection signal transmission device in a work vehicle for transmitting a work status detection signal detected in a work section to the traveling machine stop side. It is something. [Prior art and problems to be solved by the invention] Generally,
Some work vehicles such as agricultural tractors employ a so-called four-point hitch mechanism that can connect a three-point link and a power transmission shaft at the same time, making it easier to attach and detach the working part to the traveling body. There is something that has been done. By the way, with such a device, the work of attaching and detaching the working part to the traveling machine body is extremely simplified and extremely convenient, but the traveling machine body and the working part are connected to the work status detection means provided on the working part side and the traveling machine. A cord (electric wire) is wired to connect it to the control section provided on the aircraft body side, so when attaching or detaching the working section, it is necessary to attach or detach the coupler (harness) installed in the middle of the wiring. However, when a four-point hitch mechanism is adopted as mentioned above, it is easy to attach and detach the working part while sitting in the driver's seat, so it is easy to forget to attach and detach the coupler. When taking off, the traveling body may move forward without detaching the cover and the wiring may be cut, which may be a problem. [Means for Solving the Problems] In view of the above-mentioned circumstances, the present invention solves these drawbacks. It was invented with the purpose of providing a work detection signal transmission device for work vehicles that can sweep the area. The present invention also provides a working vehicle configured to have a working part attached to a traveling body using a pitch mechanism.
In order to transmit the detection signal of the work status detection means provided on the working part side to the control part provided on the traveling machine body side, the signal transmission is from the transmitting means provided on the working part side to the receiving means provided on the traveling machine body side. The signal is transmitted through the air, and the transmitting and receiving means are arranged in the hitch mechanism section so as to face each other with a gap between them.

Furthermore, the present invention provides a working vehicle configured to attach the working part to the traveling body using a hitch mechanism,
In order to transmit the detection signal of the work status detection means provided on the working section side to the control section provided on the traveling machine body side, the signal transmission is carried out from the transmitter 71 means provided on the working section side to the receiving means provided on the traveling machine body side. The transmitter/receiver means are arranged to face each other with a gap in the hitch mechanism section, and the four-point pitch mechanism section is further provided with a means for attaching and detaching the working section. It is also characterized by the provision of a power terminal means for connecting and disconnecting in a linked manner to supply power from the traveling machine side to the working part side. With this configuration, the present invention eliminates the need for attaching and detaching the coupler. [Example] Next, an example of the present invention will be described based on the drawings. In the drawings, reference numeral 1 denotes a traveling body of an agricultural tractor, and a tilling work unit 3 is detachably attached to the rear of the traveling body 1 via a four-point hitch mechanism 2, which will be described later. 4 is a pair of left and right lower links 4 and 5, which are in control of the four-point pitch mechanism 2, and are upper links, and the tips of these links are integrally connected to an arch-shaped connection frame 6. The connection frame 6 is provided with a connection hook 7 at the upper center portion and locking portions 8 at the left and right side portions of the lower portion. Furthermore, an output hitch 10 is attached to the connecting frame 6 and is interlocked with a power transmission shaft 9 connected to the traveling body 1 side. and connecting hook 7
is locked from below to the upper locking pin 11 provided on the working part 3 side, and when the lift arm 12 is moved upward to lift the working part 3, the working part 3 uses the upper locking pin 11 as a fulcrum. It takes a posture of swinging forward and downward and is brought to the traveling body 1 side, and in conjunction with this, the lower locking bin l on the working part 3 side
3 are received and engaged with the corresponding locking portions 8, and an easy hit mechanism is adopted in which the three points are connected in this way, and the input hitch 14a, which is interlocked and connected to the input shaft l4, is connected to the output. It will be interlocked and connected to the hitch 10, thereby making it possible to connect the working part 3 to the traveling body 1 at four points simultaneously, thereby creating a four-point hitch mechanism. etc. are all the same as before. In addition, 15 is a release operation lever for releasing the hitch connection, and l6 is the lift arm l2 and lower link 4.
It is a liftrond that connects the Reference numeral 17 denotes a rear cover provided on the working part 3 so as to be able to swing up and down, and a plowing depth detection sensor 19 (corresponding to the working status detection means of the present invention) is connected to the rear cover 17 via a link 18.
The plowing depth is detected based on the swing angle of the rear cover l7. The output signal from the plowing depth detection sensor 19 is input to a signal transmitting unit 21 mounted on a bracket 20 provided integrally with the working part frame 3a. This signal transmitting unit 21 pulse-converts the output signal into a corresponding ultrasonic signal and outputs it, and the outputted converted signal is transmitted toward the front of the aircraft via a transmitter 22. It is configured. On the other hand, 23 is the connection frame 6
The transmitter 2 is placed on the upper side of the area substantially surrounded by
2 is an ultrasonic receiver arranged to face the transmitter 2 with a gap therebetween, and the receiver 23 receives an output signal transmitted from the transmitter 22 and transmits the signal to a control unit 24 mounted on the traveling aircraft l. The control unit 24 is configured to output necessary control commands to the corresponding actuators based on the input detection signals, thereby controlling the work.

25 is a male terminal provided on the transmitter 22 side, and 26 is a female terminal provided on the receiver 23 side.
5.26 is configured to automatically connect and disconnect in conjunction with the attachment and detachment of the working part 3, as described above, and when connected, the battery power supply provided on the traveling machine body 1 side is turned on and off. It is planned to introduce electrical components such as the detection sensor 19 and the signal transmission unit 21. In addition, the terminal 25,
26 is the wiring for the positive (or negative) side only, and is a single wire terminal, and the negative side is omitted by adopting a body ground. In the embodiment of the present invention constructed as described above, the working part 3 can be mounted as described above by lifting the working part 3 with the upper locking pin 11 locked to the connecting hook 7, thereby also attaching the power transmission shaft. Four points were attacked simultaneously, including
Detachment of the working part 3 is automatically performed by moving the traveling machine body 1 forward with the release operation lever 5 set in the disengagement position. The plowing depth detection sensor 1 installed on the working part 3 side
There is no need to disconnect the wiring coupler from 9. In other words, in this system, the output of the plowing depth detection sensor 19 provided on the working part 3 side is received by the receiver 23 provided on the traveling machine body 1 side by ultrasonic air propagation, and the moss is removed by the control part 24.
Therefore, there is no need for electrical wiring to connect the two, and as a result, there is no need to attach or detach the coupler at the same time as the working part 3 is attached or detached. This means that the risk of cutting, etc. can be avoided.

Moreover, the air propagation unit including the transmitter/receiver units 22 and 23 required for this purpose is provided in the hit landing section of the four-point hit mechanism 2, so the four-point hit mechanism 2 protects the transmitter/receiver unit. In addition to being able to be used as a component as is, the dead space between the working section 3 and the traveling body 1 can be used effectively, and the transmitter/receiver 22 and 23 can be placed close to each other, so they have excellent directivity. A transmitter/receiver can be installed, and the transmitter/receiver 22, 23 can be installed.
Even if a device with low power consumption and low output is adopted, problems such as erroneous signal transmission due to external signal input or crosstalk, which are common when transmitting signals by air propagation, are eliminated, making it easier to transmit signals using wired methods. This means that highly reliable signal transmission is possible, with almost no inferiority, and malfunctions can be eliminated. Moreover, in this device, as mentioned above, the working part 3
is attached to the traveling machine body L via the four-point hit mechanism 2, and the power terminals 25 and 26 are automatically connected to the electric components installed on the working part 3 side, such as the plowing depth detection sensor 19. As a result, there is no need to install a battery on the working part 3 side, and therefore, inoperation due to battery exhaustion can be avoided. Moreover, terminals 25 and 26
The connection/disconnection theory is automatically activated in connection with the attachment/detachment of the working part 3, so even if power is supplied from the traveling machine side, there is no burden on the operator. The theory of connection and disconnection of the power terminal connected to the connection and disconnection of the working part 3 is affected by only the single pole of the power supply wiring, so even the signal transmission wiring including the power supply wiring can be connected and disconnected at the same time. Unlike the case where multi-pole terminals are used, there is no directionality, and connection and disconnection can be performed reliably and easily.

Further, since the transmitter/receivers 22 and 23 are surrounded by the connecting frame 6 and arranged above the inside thereof, the transmitter/receivers 22 and 23 can be protected through the connecting frame 6.

Moreover, in the embodiment, the trumpet-shaped covers 22a and 23a covering the transmitter/receiver 22, 23 are loosely fitted so as to overlap each other when the working part is attached, so that the transmitter/receiver Terminals 25, 26 along with devices 22, 23
Even if the male terminal 22 is a bare wire that is not covered with an insulating material, there is no risk of electrical shock or short circuit if a person or object comes into contact with it. This can be prevented from occurring. It should be noted that the present invention is not limited to the above-mentioned embodiments, and examples of things that propagate in the air include optical signals, radio wave signals, etc., instead of ultrasonic signals.
Any method that transmits information (signals) through air propagation can be implemented. [Operations and Effects] In summary, since the present invention is constructed as described above, the detection signal of the work situation detection means provided on the working section side is transmitted from the transmitting means provided on the working section side to the traveling machine body side. The information is transmitted through air propagation to the receiving means and input to the control unit.Therefore, a four-point hit mechanism that connects four points simultaneously, including the temporary power transmission shaft, is adopted to simplify the attachment and detachment of the working unit. Even if this is done, there is no need to attach or detach the cover that is located in the middle of the wiring between the work situation detection means and the control section, unlike the conventional method.

Moreover, since the transmitter/receiver means are disposed in the hitch mechanism part so as to face each other with a gap, the four-point pitch mechanism can be used as is as a protection member for the transmitter/receiver means, and the working part and the traveling body are connected. It is possible to make effective use of the dead space between the transmitting and receiving means, and it is also possible to place the transmitting and receiving means in close proximity to each other, making it possible to mount transmitting and receiving devices with excellent directivity to each other. Even if a small output is adopted, problems such as input of external signals and transmission of incorrect signals due to crosstalk, which are common when transmitting signals through air propagation, are eliminated, and it is almost as good as signal transmission using wired methods. This enables highly reliable signal transmission and eliminates malfunctions. Furthermore, if the hitch mechanism section is provided with a power terminal means for connecting and disconnecting in conjunction with the above-mentioned working section connection theory and supplying power from the traveling machine body side to the working section side, There is no need to install a battery, and the power terminal means can be automatically connected and disconnected in conjunction with the attachment and detachment of the working part, so there is no increase in the work burden.

[Brief explanation of drawings]

The drawings show an embodiment of a work detection signal transmission device for a work vehicle according to the present invention, in which FIG. 1 is a partial side view of an agricultural tractor with a working section attached, and FIG. The figure is a partial side view of the agricultural tractor with the working part removed, Fig. 3 is a partially cutaway front view of the four-point hitch mechanism, gX4 is a plan view of the working part, and Fig. 5 is the signal transmission path. Figure 6 is an enlarged cross-sectional view of the transmitter/receiver section. In the figure, 1 is a traveling machine body, 2 is a four-point hitch mechanism, 3 is a working part, 17 is a rear cover, 18 is a plowing depth detection sensor, 22 is a transmitter, and 23 is a receiver. Figure 3 Figure 4? ?

Claims (1)

[Scope of Claims] 1) In a work vehicle configured such that a working part is attached to a traveling machine body using a hitch mechanism, a detection signal from a work status detection means provided on the working part side is transmitted to the traveling machine body. In order to transmit the signal to the control section provided on the side, the signal is transmitted by air propagation from the transmitting means provided on the working section side to the receiving means provided on the traveling aircraft side, and these transmitting/receiving means are 1. A work detection signal transmission device for a work vehicle, characterized in that the hitch mechanism portions are arranged so as to face each other with a gap between them. 2) In a work vehicle configured such that a working part is attached to a traveling body using a hitch mechanism, a control unit is provided on the traveling body side to receive a detection signal of a work situation detection means provided on the working part side. In order to transmit the signal, the signal is transmitted by air propagating the signal from the transmitting means provided on the working part side to the receiving means provided on the traveling body side, and these transmitting/receiving means are connected to the four-point hitch mechanism section. The hitch mechanism section is further provided with a power terminal for connecting and disconnecting the working part to supply power from the traveling aircraft side to the working part side. A device for transmitting a work detection signal in a work vehicle, characterized in that a means is provided.