JPH0210888Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is applicable to mobile agricultural machines such as combines.
The present invention relates to a safety device that activates a safety device such as an alarm device when the working equipment is in a low position that may impede running, such as when the working equipment touches the ground when it is not working.

Generally, when the mobile agricultural machinery is not in use, the working machinery is placed on the ground in order to prevent unnecessary loads from being placed on the hydraulic circuit etc. due to its heavy weight, and to avoid unexpected dangers. The machine is stored with its own weight supported by the ground. Therefore, when you use a mobile agricultural machine again from the storage state described above, if you forget that the working machine is in the lowered state and start the mobile agricultural machine, start traveling, and then turn it around, the working machine may It had some drawbacks, such as being damaged by digging into the ground or colliding with obstacles near the ground. In addition, when moving a mobile agricultural machine on a level ground, even if the raised position of the non-working machine does not interfere with normal road running, if the machine is not raised above a predetermined position, it will cause problems such as barns, hangars, etc. This has the disadvantage that the turning operation during entry causes the work equipment to collide with surrounding structures and be damaged.

Therefore, the present invention uses a work equipment position detector that detects the position of the work equipment relative to the body of the mobile agricultural machine during work, and uses the work equipment position detector to detect the safe position of the work equipment when the work equipment is not working. The safety device is activated when the steering operation means of the mobile agricultural machine is operated when the work machine is below the set safe position, thereby eliminating the above-mentioned drawbacks. The purpose of this invention is to provide a safety device for mobile agricultural machinery that has been solved.

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

As shown in FIG. 1, the combine 1 has a machine body 3 supported by a crawler 2. In front of the machine body 3, a pre-processing section 5, which is a working machine, has a link device operated by a hydraulic mechanism, etc. The pretreatment section 5 is provided with a divider 4 at its lower end. A work equipment position detector 6 is disposed near the pivot point of the support frame 5a that supports the preprocessing section 5 up and down through a link or the like, and detects the up/down position of the preprocessing section 5. The detector 6 has a built-in rotary potentiometer. Further, a pilot's seat 7 is arranged in the upper front part of the aircraft body 3, and in front of it are left and right side clutch levers 9, 10, which are steering operation means for turning the aircraft body 3, and a work machine 5. Various operation levers such as a work machine clutch lever 11 are provided for operating the work machine clutch lever 11.

FIG. 2 shows an example of a safety device operating circuit, in which 12 is a power source, 13 is a main switch, and the main switch 13 is closed in conjunction with, for example, a starting switch of the mobile agricultural machine 1. There is.
Reference numeral 15 denotes a rotary potentiometer built into the detector 6, and the output voltage corresponding to the position of the preprocessing section 5, that is, when the preprocessing section 5 is located below, the potentiometer 15 has an output voltage corresponding to the position of the preprocessing section 5. When the preprocessing section 5 is rotated downwardly, a larger output voltage is taken out from its output end than when the preprocessing section 5 is located above. Reference numeral 16 denotes a work machine safety position setting device, which consists of a variable resistor, and its reference output voltage is determined by comparator 1.
In the comparator 17, the output voltage of the potentiometer 15 is compared with the reference output voltage from the setting device 16, and if the output voltage from the potentiometer 15 is greater than the reference output voltage from the setting device 16, When this happens, an output signal "1" is output to the subsequent AND circuit 19. Reference numeral 20 denotes a work machine switch, which is linked to the work machine clutch lever 11 described above, and is configured to receive input to the AND circuit 19 via an inverter 21. Therefore, the work machine 5, that is, the preprocessing section There is no input to the AND circuit 19 when the preprocessing section 5 is not working, and an input is made to the AND circuit 19 when the preprocessing section 5 is not working, and the safety device activation circuit shown in this figure is connected to the detection action by the potentiometer 15. It's becoming like that. 22 is also an AND circuit, and an OR circuit 26 is activated when either of the switches 23 and 25, which are interlocked by the operation of the left and right side clutches 9 and 10, is turned on and the output "1" of the AND circuit 19 is activated. It becomes conductive due to the output "1" of , and turns on the switching transistor 27. 29 is a relay activated by turning on the transistor 27;
Activation of this relay 29 closes a relay contact 30, and a safety device 31 such as a buzzer or horn is activated.

Note that the safety device 31 may be replaced with a warning device such as a buzzer or a horn, and may be replaced with another safety device such as a travel stop device using a solenoid or the like or a brake actuation device. In addition, a changeover switch is provided between the potentiometer 15 and the comparator 17, which is turned on when the work equipment 5 is not working, and the AND circuit 1
9, the switch 20, and the inverter 21 may be omitted.

Since the present embodiment has the above-described configuration, the work equipment switch 20 is closed during normal work, so the AND circuit 19 is connected via the inverter 21.
Therefore, the safety device activation circuit shown in FIG. 2 does not operate at all, and the output of the potentiometer 15 in the work equipment position detector 6 is a device for detecting the position of the work equipment 5 (not shown). used for.

Next, when the work is finished and the mobile agricultural machine 1 is to be left unused for a while, the work machine switch 20 is opened and the lower part of the work machine, that is, the pretreatment section 5 is in contact with the ground. Lower it and turn off the main switch 13.

In addition, as shown in FIG. 1, the divider 4
The setting device 1 is set so as to correspond to the output of the potentiometer 15 of the detector 6 when the tip of the detector 6 is in contact with the ground or is within range A very close to the ground.
Set 6.

In this way, after leaving the mobile agricultural machine 1 for a while,
When starting work again, turn on the start switch, that is, the main switch 13. In this state, the tip of the divider 4 is within the range A as described above, so it is detected from the reference output voltage from the setting device 16. Since the output voltage from potentiometer 15 of device 6 is higher, an output signal is output from comparator 17, and since work equipment switch 20 is off at this time, an output signal is output via inverter 21. Then, an output signal "1" is output from the AND circuit 19 to the AND circuit 22, and the safety device activation circuit becomes ready for operation.

In this state, that is, in the state where the work machine 5 is still lowered, when either the left or right side clutch levers 9, 10 are operated to turn the mobile agricultural machine 1, an output signal is sent via the OR circuit 26 based on the operation. "1" is output to the AND circuit 22, and the output signal "1" of the AND circuit 22 turns on the switching transistor 27, activating the relay 29, which closes the relay contact 30, and the safety device 31 is activated, and the operator is warned that if the working machine 5 is in the lowered position and continues to operate the mobile agricultural machine 1 without raising the working machine 5, the working machine 5 may be damaged.

In addition, the range A of the divider 4 that should be alerted is
can be arbitrarily set by the operator using the variable resistor constituting the setting device 16 and over the entire movement range of the work equipment 5. By providing a reference index corresponding to traveling on the road, the work equipment 5 can be raised to a height suitable for traveling on the road by simply adjusting the instruction on the setting device 16 to the reference index corresponding to traveling on the road. If not, an alarm etc. will be issued in the same way as above.

As explained above, according to the present invention, the safety device activation circuit is switched to the operable state based on the work machine inoperative position of the work machine switch 20, so when the mobile agricultural machine 1 is in the working state, the work machine position is detected. The device 6 functions for automatic control such as cutting height control,
To be able to perform work with a mobile agricultural machine under appropriate automatic control, and to perform work continuously and easily and efficiently while preventing the work machine 5 from being positioned too low and damaging the cutting blade, etc. In addition, when the work equipment 5 is in a non-working state, the work equipment position detector 6 can function as a safety device activation circuit that is compared with the work equipment safety position setting device 16.

Furthermore, based on the operation of the steering operation means 9 and 10,
Since the safety activation circuit that is ready for operation is activated, when the machine temporarily moves straight in the field or on the road with the work equipment switch 20 turned off, the safety device will not activate immediately even if the machine is not working. , when the safety device 35 is activated only after operating the steering operation means 9 and 10, for example, when entering or exiting a barn, hangar, etc., there is a risk that the turning operation will cause the work equipment to collide with surrounding structures. , or when the work equipment is turned around with it dug into the ground or located near the ground, and there is a risk of damage to the work equipment itself, the safety device 35 is activated, and the safety device is activated when necessary. Although the safety device can be activated to prevent damage to the working machine or the structure, it can also prevent the safety device from being activated unnecessarily and causing trouble.

Furthermore, since the work equipment position detector 6, work equipment switch 20, and steering operation means 9, 10 that are originally included in the mobile agricultural machine 1 are used, there is no need for a special safety device detector, etc., making it inexpensive and simple. It can be installed in

[Brief explanation of the drawing]

FIG. 1 is an overall side view showing a mobile agricultural machine to which the present invention is applied, and FIG. 2 is a circuit diagram showing an example of a safety device operating circuit of a safety device according to the present invention. 1... Mobile agricultural machine (combine harvester), 3... Aircraft,
5... Work equipment (pre-processing section), 6... Work equipment position detector, 15... Potentiometer, 9, 10...
Steering operation means (left and right side clutch levers),
16...Work machine safety position setting device, 17...Comparator, 19...Switching means (AND circuit), 22...
...Operating means (AND circuit), 20... Work machine switch, 23, 25... Switch, 31... Security device (alarm device).

Claims (1)

[Claims for Utility Model Registration] A work equipment position detector for detecting the vertical position of a work equipment supported on a machine body so as to be able to rise and fall; a work machine switch for operating the work machine; and a steering wheel for steering the machine body. A mobile agricultural machine comprising: a work equipment safety position setting device; a detection value of the work equipment position detector is compared with a setting value of the work equipment safety position setting device, and the work equipment is adjusted to the setting value. a safety device activation circuit that activates the safety device when the safety device is below a safe position set by the device; and a switching means that switches the safety device activation circuit to an operational state based on the work equipment non-operation position of the work equipment switch. A safety device for a work machine in a mobile agricultural machine, comprising: an actuating means for actuating the safety device actuating circuit in an operable state based on the operation of the steering operating means.