JP2017070214A - Power supply system of agricultural machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply system of an agricultural machine that can store power wirelessly supplied from a tractor to a work machine attached to the tractor for performing agricultural work in a power storage unit, and reduce the consumption of the power stored in the power storage unit.SOLUTION: A power supply system of an agricultural machine includes a power transmission unit 14 installed on a tractor 1 side, and connected to a power source 11 included in the tractor 1 through a switch 13, a power receiving unit 21 installed in a work machine 2, a work machine side radio unit 22 installed in the work machine 2 and connected to the power receiving unit 21, a power storage unit 23 installed in the work machine 2 and connected to the power receiving unit 21, a control unit 24 installed in the work machine, a radio current control unit installed in the work machine 2, and an actuator 27 installed in the work machine 2. The power stored in the power storage unit 23 is supplied when the actuator 27 is operated, and the current control unit 42 executes control so that the power stored in the power storage unit 23 is not consumed in the work machine side radio unit 22 when it is determined that the power is not wirelessly supplied to the power receiving unit 21.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power supply system for farm work machines, and more particularly, to a power supply system for farm work machines that feeds power to a work machine that is attached to a tractor and performs farm work via wireless power feeding.

  In a work machine that is attached to a tractor and performs farm work, a battery installed on the tractor side is often used as a power source for output devices such as actuators that the work machine has. At this time, the battery on the tractor side was supplied via a harness.

  On the other hand, the work machine performs the farm work by replacing another type of work machine with the tractor according to the contents of the farm work. For this reason, in many cases, the harness that connects the battery and the work machine disposed on the tractor is detachable when a connector is provided on the way and the work machine is replaced.

  For this reason, the operator needs to attach and detach the connector between the tractor and the work implement when changing the work implement to the tractor. For this reason, Patent Document 1 describes a system that eliminates the need for attaching and removing a harness for power feeding through wireless power feeding between a tractor and a work machine.

JP 2011-217742 A

  Patent Document 1 also describes a configuration having a wireless reception unit. The wireless reception unit is in a standby state in order to receive a signal from the wireless transmission unit. In this state, the wireless reception unit consumes a certain amount of power for standby. For this reason, when wireless power feeding is not performed, if the wireless reception unit is left unswitched for a long time, power stored in the power storage device is consumed. As a result, the power output from the power storage device is not sufficient, and there is a problem that the actuator having a large output cannot be operated until the power is stored in the power storage device.

  In view of the above-described problems, the present invention stores power that is wirelessly fed from a tractor to a work machine that is attached to a tractor to perform farming work in a power storage unit, and can reduce the consumption of power stored in the power storage unit. An object is to provide a power supply system for a machine.

In order to achieve the above object, one of the power supply systems for agricultural machines according to the present invention is a power supply system applied to a work machine that is detachable from a tractor and performs agricultural work, and is a power supply that is installed on the tractor side and has in the tractor And a power transmission unit connected via a switch, a power reception unit installed in the work machine, a work machine side radio unit installed in the work machine and connected to the power reception unit, and installed in the work machine A power storage unit connected to the power receiving unit, a control unit installed in the working machine, a current control unit installed in the working machine, and an actuator installed in the working machine, the control unit , The actuator is controlled based on a signal received by the work implement side radio unit, wireless power feeding from the power transmission unit to the power receiving unit is possible, and the power fed by the wireless power is the power of the work machine side radio unit The power storage unit is stored in the power storage unit, the power stored in the power storage unit is supplied when the actuator is operated, and the current control unit determines that the power reception unit is not wirelessly powered. It controls so that the electric power stored in the unit is not consumed by the work unit side radio unit.
Further, in one of the power feeding systems of the agricultural machine according to the present invention, the determination as to whether or not wireless power feeding is being performed by the current control unit is based on whether or not the current from the power receiving unit is flowing beyond a certain level. It is characterized by that.

Furthermore, one of the power feeding systems for the agricultural machine according to the present invention includes a power storage control unit that stops power transmission from the power receiving unit to the power storage unit when the power stored in the power storage unit is equal to or greater than a certain level. It is characterized by.
Furthermore, one of the power feeding systems for agricultural machines according to the present invention is characterized in that the power storage unit is a battery or a capacitor.
Furthermore, one of the power feeding systems for agricultural machines according to the present invention includes a radio unit, and the work machine side radio unit receives an operation signal from the radio unit.

Furthermore, one of the power feeding systems for the agricultural machine according to the present invention is characterized in that the power source of the tractor is a battery included in the tractor, and the switch is a switch for starting the tractor.
Furthermore, in one of the power feeding systems for the agricultural machine according to the present invention, the work machine side wireless unit includes a wireless unit power storage unit in which the wireless power is stored, and the wireless unit power storage unit is the work machine. It is possible to serve as a power source for the side radio unit.

  One of the power feeding systems of the agricultural machine according to the present invention is a power feeding system applied to a work machine that is detachable from the tractor and performs agricultural work, and is connected to the power source of the tractor installed on the tractor side through a switch. A power transmission unit, a power reception unit installed in the work machine, a work machine side radio unit installed in the work machine and connected to the power reception unit, a work machine side radio unit installed in the work machine, A wireless power supply from the power transmission unit to the power reception unit, and the wirelessly powered power serves as a power source for the work unit side wireless unit and the low power device. Features.

  According to the present invention, in a power feeding system for a farm work machine, the power that is wirelessly fed from the tractor to the work machine that is attached to the tractor to perform farm work is stored in the power storage unit, and the consumption of the power stored in the power storage unit is reduced. Can do.

It is a whole lineblock diagram in the electric power feeding system of the agricultural machine of Example 1. FIG. FIG. 3 is an explanatory diagram of wireless power feeding according to the first embodiment. It is a side view which shows an example of the working machine with which the electric power feeding system of the agricultural working machine of this invention is applied. It is a top view which shows an example of the working machine with which the electric power feeding system of the agricultural working machine of this invention is applied. It is a front view which shows an example of the working machine with which the electric power feeding system of the agricultural working machine of this invention is applied. It is the wiring schematic in the electric power feeding system of the agricultural machine of Example 2. FIG. It is a whole block diagram in the electric power feeding system of the agricultural machine of Example 3. FIG.

  A mode for carrying out the present invention will be described.

  1 is an overall configuration diagram of a power feeding system for an agricultural machine according to a first embodiment. FIG. 2 is an explanatory diagram of wireless power feeding according to the first embodiment.

  The present invention is a system that can supply power (electricity) from the tractor 1 side to the work implement 2 side via wireless power feeding between the power transmission unit 14 and the power reception unit 21.

  The tractor 1 includes a tractor battery 11, a power harness 12, a switch 13, and a power transmission unit 14. The wireless unit 10 can be disposed in the vicinity of the driver seat 4 of the tractor 1.

  The work machine 2 includes a power reception unit 21, a work machine side radio unit 22, a power storage unit 23, a control unit 24, a low power device 25, a relay 26, and an actuator 27. Moreover, it has the plus line 30, the minus line 31, the electric power feeding line 32, the electrical storage line 33, and the branch line 34 for electrically connecting. Furthermore, it has the electrical storage control part 41, the electric current control part 42, and the detection part 43, and these are good also as the electric current control unit 40. Furthermore, it has a communication line 38 for information connection.

  The wireless unit 10 is a device that can transmit information to the work machine side wireless unit 22 wirelessly. The radio unit 10 can include an operation unit having an operation switch, and information by operating the operation unit can be transmitted as an operation signal to the work machine side radio unit 22 by radio transmission. The operation unit may include a switch such as a push button switch that operates the actuator 27 and the low-power device 25. At this time, the operation unit may be integrated with the wireless unit 10 or may be separated through wiring or the like. Furthermore, the wireless unit 10 may include a display unit to display necessary information. At this time, the display unit may be integrated with the wireless unit 10 or may be separated through wiring or the like. Moreover, you may make it the radio | wireless part 10 receive the information from the working machine side radio | wireless part 22 by radio | wireless as needed.

  The tractor battery 11 is installed on the tractor 1. The tractor battery 11 can be a direct current power source that sends electricity to the power transmission unit 14. Moreover, you may have the structure charged using the engine motive power from the tractor 1. FIG. Moreover, the battery which supplies the electricity required for the tractor 1 may be sufficient.

  The power harness 12 is a harness (wiring) that connects the tractor battery 11 and the power transmission unit 14. A switch 13 is provided on the way.

  When the switch 13 is ON (on), power from the tractor battery 11 is sent to the power transmission unit 14, and when it is OFF (off), power from the tractor battery 11 is not sent to the power transmission unit 14. The switch 13 can be shared with a switch for starting a tractor such as an engine start of the tractor 1. For example, the switch 13 can be configured as a key switch that is turned on when a key for starting the engine is rotated. Thus, electric power can be supplied when the tractor key switch (switch for starting the tractor) is ON, and the switch 13 is turned ON when the operator starts the tractor. In addition to this, the switch 13 may be arranged so as to be arranged in the vicinity of the driver's seat 4 so that an operator who gets on the tractor 1 can turn on and off depending on the situation.

  The power transmission unit 14 is a device on the power transmission side for performing wireless power feeding with the power reception unit 21, and converts the power from the tractor battery 11 sent via the power harness 12 into wireless power transmission for power transmission. For this reason, the power transmission part 14 has a device required in order to convert electric power and to transmit by wireless. Further, the power transmission unit 14 can be easily supplied with wireless power by being arranged at a position close to the work machine 2 on the tractor 1 side.

  The power receiving unit 21 is a device on the power receiving side for performing wireless power feeding with the power transmitting unit 14 and receives power from the power transmitting unit 14 and converts it into electric power. The converted power is sent to the plus line 30. For this reason, the power receiving unit 21 has a device necessary for receiving power wirelessly and converting it into electric power. The power receiving unit 21 is connected to the plus line 30 and the minus line 31, the minus line 31 is connected to the minus side of the converted circuit, and the plus line 30 is connected to the plus side of the converted circuit. Yes.

  A method of wireless power feeding performed between the power transmission unit 14 and the power reception unit 21 will be described. Examples of wireless power feeding include “electromagnetic induction”, “magnetic resonance”, and “microwave / laser light”. The “electromagnetic induction” method is a method in which electric power is transmitted from the primary side coil to the secondary side coil by electromagnetic induction. The “magnetic resonance” method is a method of transmitting power using resonance. The “microwave / laser light (wireless)” method is a method of performing power transmission using microwaves or laser light.

  When these methods are applied, the power transmission unit 14 and the power reception unit 21 are configured to match these methods. For example, in the case of the “electromagnetic induction” method, the power transmission unit 14 has a system for generating alternating current and a primary coil, and the power reception unit 21 has a system for rectifying with a secondary coil. Further, in the case of the “magnetic resonance” method, the power transmission unit 14 includes a system and a coil for generating a constant frequency, and the power reception unit 21 includes a system that rectifies the coil.

  The work machine side wireless unit 22 receives a wireless signal from the wireless unit 10. When a signal is received from the wireless unit 10, it is sent to the control unit 24 via the communication line 38. For easy understanding, a display when the power is on, a display indicating the reception state, and the like may be added. In addition, the work machine side radio unit 22 may transmit information obtained from the control unit 24 to the radio unit 10. In addition, the work machine side radio unit 22 can use power obtained through wireless power feeding, and the work machine side radio unit 22 can transmit power by wireless power feeding between the power transmission unit 14 and the power receiving unit 21. It operates within the range of. The work machine side radio unit 22 may have a connection unit 22a and may be a connector unit that can be attached to and detached from the connection unit 32a of the power supply line 32 and the minus line 31. Note that the work machine side radio unit 22 requires a certain amount of power when it is in a receivable state (standby state) in which a radio signal from the radio unit 10 can be received.

  The power storage unit 23 is configured by a device having a power storage function and stores electric power. As the power storage unit 23, for example, a battery constituted by a nickel metal hydride battery, a lead storage battery, a lithium ion battery, a lithium battery, or the like, a capacitor, or the like can be applied. If it is a battery, it is stored by charging and the supplied power is stored.

  The control unit 24 controls the actuator 27 based on the operation signal received by the work implement side radio unit 22. Further, the control of the low-power device 25 and information from the low-power device 25 are acquired and reflected in the control as necessary. Only the communication line 38 capable of exchanging information is connected between the control unit 24 and the work unit side radio unit 22, and wiring for exchanging power is not provided. The control unit 24 is configured by an electronic device or the like necessary for control, and can be stored in the box as a control box and can be made independent.

  The low power device 25 is a device that operates with low power, and examples thereof include a lamp including an LED, a sensor, a buzzer, and a switch. Here, regarding small power, if it is at least within the range that can be directly covered by the power through the wireless power feeding of the power transmitting unit 14 and the power receiving unit 21 or within the range that can be directly covered together with the work unit side radio unit 22, it is said to be small power. Can do. Examples of the low power device 25 include a device that operates under the control of the control unit 24 or a device that can provide information to the control unit 24.

  The relay 26 is configured by a relay circuit for operating the actuator 27 according to a command from the control unit 24. This is provided as necessary. For example, if the actuator 27 is an electro-hydraulic cylinder with high power consumption, it may be used. Further, a semiconductor other than a relay circuit (for example, FET, CMOS, transistor, etc.) that can flow a large current may be used.

  The actuator 27 operates under the control of the control unit 24. For example, an electric hydraulic cylinder or a motor can be used. In the first embodiment, the operation can be performed using the electric power from the power storage unit 23.

  One of the plus lines 30 is connected to the plus side of the power receiving unit 21, and the other is branched to a power supply line 32 and a power storage line 33 at a branch point 36. In addition, a power storage control unit 41 is provided in the middle.

  One end of the minus line 31 is connected to the minus side of the power receiving unit 21 and branches in the middle. One of the branched other ends is on the minus side of the power storage unit 23, and the other branched other end is the work unit side radio unit. 22 is a conductive wire connected to the negative side of 22. Here, the minus line 31 is a lead wire serving as a reference of 0 V, and may be grounded.

  The power supply line 32 is a conducting wire having one end connected at the branch point 36 of the plus line 30 and the other end connected to the plus side of the work machine side radio unit 22.

  The power storage line 33 is a conducting wire having one end connected at the branch point 36 of the plus line 30 and the other end connected to the plus side of the power storage unit 23. In addition, a current control unit 42 is provided in the middle.

  The branch line 34 is a conducting wire that branches from the middle of the minus line 31 and the middle of the power storage line 33 and sends electricity to the control unit 24, the low-power device 25, the relay 26, and the actuator 27. In FIG. 1, it is connected to the wiring connecting between the control unit 24 and the relay 26.

  The communication line 38 is connected to the work unit side radio unit 22 and the control unit 24, and here is a communication line for exchanging information only, and does not exchange electric power.

  The control unit 24, the low-power device 25, the relay 26, and the actuator 27 are connected by wiring, and are configured to be capable of electrical exchange and information exchange as necessary.

  When the amount of power stored in the power storage unit 23 exceeds a certain level, the power storage control unit 41 detects this and prevents the power from the power receiving unit 21 from being sent to the power storage unit 23. Further, when the amount of power stored in the power storage unit 23 is below a certain level, this is detected and the power from the power receiving unit 21 is sent to the power storage unit 23. For example, when the storage control unit 41 determines that the storage amount of the storage unit 23 has become a certain level or more as a switch made of a semiconductor composed of an IC or the like, the storage control unit 41 cuts the circuit to the storage line 33 to transmit power. Try to stop. Further, when it is determined that the amount of power stored in the power storage unit 23 has become below a certain level, a circuit to the power storage line 33 is inserted to transmit power to the power storage unit 23. Thus, for example, it is possible to prevent the life of the power storage unit 23 from being shortened.

  Here, when the power storage unit 23 is a battery, the power storage control unit 41 controls charging. The determination that the battery is charged above a certain level, which is a condition for stopping charging, is performed when the positive (power storage line 33) and negative (minus line 31) voltages of the power storage unit 23 are above a certain level, When the current is below a certain level, or when the positive and negative voltages of the power storage unit 23 are above a certain level and the current to the power storage unit 23 is below a certain level by combining them, the power storage unit 23 is charged above a certain level. Can be determined. The case where the voltage exceeds a certain level is a case where the voltage becomes a predetermined higher value than the standard voltage. Further, the case where the current is below a certain level is a case where the current is considerably smaller than the current that flows during normal charging. Moreover, the state charged more than fixed can be made into the state of substantially full charge, for example. In addition, when charging is stopped, as a condition for starting charging, the positive and negative voltages of the power storage unit 23 can be a predetermined or lower voltage. The voltage value below a certain value here is higher than the standard voltage at the time of charging, but a value lower than the voltage value above a certain value, which is a condition for stopping the charging, is adopted.

  In FIG. 2, the power storage control unit 41 is provided in the middle of the plus line 30 closer to the power receiving unit 21 than the branch point 36. In this case, the power storage control unit 41 may have a function for rectification. Good. On the other hand, the power storage control unit 41 may be provided in the middle of the power storage line 33 that is closer to the power storage unit 23 than the branch point 36. However, if it is not closer to the power receiving unit 21 than the branch point of the branch line 34, power cannot be supplied from the power storage unit 23 to the actuator 27 or the like via the branch line 34 when the storage amount is a certain level or more.

  The current control unit 42 does not send the power from the power storage unit 23 to the work unit side radio unit 22 when it is determined that the wireless power supply is not performed (including the case where the wireless power supply is not properly performed). It is what you want to do. For example, as a switch by a relay or the like, it is provided in the middle of the power storage line 33 that is the power storage unit 23 from the branch point 36. In this case, while the power transmission unit 14 and the power reception unit 21 are wirelessly feeding, this current is detected by the detection unit 43 and the switch in the current control unit 42 is turned on. At this time, a current due to the wireless power feeding received by the power receiving unit 21 flows to the work implement side radio unit 22. Further, when wireless power feeding is not performed, the current in the power control unit 42 is turned off without sensing the current by the wireless power feeding by the detection unit 43 so that the current in the power storage unit 23 does not flow to the work unit side radio unit 22. Shut off.

  Further, the current control unit 42 may not turn on the switch when the current during the wireless power feeding is not sufficient. That is, the switch in the current control unit 42 is turned on when the current from the power receiving unit 21 sensed by the detection unit 43 is more than a certain value, and is turned off otherwise. Thereby, the switch in the current control unit 42 can be turned OFF even when the power transmission unit 14 and the power reception unit 21 are not sufficiently opposed to each other and the power is not properly supplied to the work implement side radio unit 22. In this case, the current control unit 42 functions as an opposing detection unit between the power transmission unit 14 and the power reception unit 21.

  Furthermore, the current control unit 42 may turn on the switch in the current control unit 42 only when a current flows from the power receiving unit 21 toward the power storage unit 23. This can be realized by turning on the switch in the current control unit 42 when a current is sensed in the direction from the power receiving unit 21 to the power storage unit 23, for example, by providing a diode in the circuit. That is, even if a current flows from the power storage unit 23 to the power receiving unit 21, the switch in the current control unit 42 is not turned on. In this case, the current control unit 42 functions as a reverse connection detection unit that prevents a failure of other devices when the plus / minus of the power storage unit 23 is reversed.

  Further, the current control unit 42 may be provided in the middle of the power supply line 32. However, in this case, the function as the reverse connection detection unit is not sufficiently exhibited, but the functions of the wireless power feeding detection unit and the opposite detection unit are achieved.

  Here, the power storage control unit 41, the current control unit 42, and the detection unit 43 described above can be provided integrally with the power receiving unit 21 as the current control unit 40. Moreover, it is also possible to provide as a separate body as shown in FIG. It is also possible to provide a part of these as a unit with the power receiving unit 21.

  Next, the flow of electricity will be described.

  When the work machine 2 is attached to the tractor 1 and the power transmission unit 14 and the power reception unit 21 face each other, when the switch 13 on the tractor 1 side is ON, the power from the tractor battery 11 is sent to the power transmission unit 14. Power is supplied to the power receiving unit 21 wirelessly and is converted into electric power by the power receiving unit 21. At this time, electricity sent to the power reception unit 21 is sensed by the detection unit 43, the switch of the current control unit 42 is turned on, and the power storage line 33 is connected. The electric power converted by the power receiving unit 21 can be used as a power source for the work machine side radio unit 22 through the plus line 30 and the power supply line 32. That is, when the switch 13 is ON, electric power is supplied to the work machine side radio unit 22 to enable reception, and a radio signal from the radio unit 10 can be received. Furthermore, the electric power from the power receiving unit 21 is sent to the power storage unit 23 through the plus line 30 and the power storage line 33 to store electricity. Further, when the amount of power stored in the power storage unit 23 exceeds a certain level, the power storage control unit 41 described above does not charge any more. At this time, since the plus line 30 is disconnected by the switch in the power storage control unit 41, power is supplied from the power storage unit 23 to the work implement side radio unit 22. The electricity stored in the power storage unit 23 can be transmitted to the control unit 24, the low power device 25, the relay 26, and the actuator 27 through the power storage line 33, the branch line 34, etc. Can do. Further, if the supplied power supplied wirelessly is sufficient, electricity may be directly supplied from the power receiving unit 21 to the control unit 24 and the low power device 25 through the plus line 30, the power storage line 33, and the branch line 34. In addition, a part of the electric power of the actuator 27 may be provided.

  Note that when the branch point 36 is provided between the power storage control unit 41 and the power receiving unit 21 and the power storage control unit 41 is provided in the power storage line 33 on the power storage unit 23 side of the branch point 36, the power storage unit Even when the power storage amount of the power supply 23 exceeds a certain level, power can be supplied from the power receiving unit 21 through the plus line 30 and the power supply line 32 to the work unit side radio unit 22.

  When the switch 13 is OFF, the power from the tractor battery 11 is not sent to the power transmission unit 14. For this reason, electricity is not sent from the power receiving unit 21, and electricity is not sent to the work machine side radio unit 22. On the other hand, the electric power stored in the power storage unit 23 passes through the power storage line 33 and the branch line 34 (if the current control unit 42 is on the power receiving unit 21 side relative to the branch line 34), the control unit 24, Although power can be transmitted to the electric power device 25, the relay 26, and the actuator 27, the electric power is not transmitted to the work machine side radio unit 22 due to the action of the current control unit 42 described above. For this reason, electricity does not flow to the work implement side radio unit 22 and signal reception from the radio unit 10 cannot be performed. However, when the switch 13 of the tractor 1 is OFF, the electric power from the power storage unit 23 is received from the work implement side radio unit 22. Therefore, useless power consumption of the power storage unit 23 can be prevented. Even when the work implement 2 is detached from the tractor 1, wireless power feeding cannot be performed, so that the switch 13 is turned off on the work implement 2 side. The same control is also possible when the power transmission unit 14 and the power reception unit 21 are not sufficiently opposed and power is not sufficiently supplied to the work implement side radio unit 22.

  FIG. 3 is a side view showing an example of a work machine to which the power supply system for a farm work machine according to the present invention is applied. FIG. 4 is a plan view showing an example of a working machine to which the agricultural machine power feeding system of the present invention is applied. FIG. 5 is a front view showing an example of a working machine to which the power supply system for agricultural machines according to the present invention is applied. The working machine 2 in FIGS. 3 to 5 is a scraping work machine 50 provided with a folding mechanism, and the input shaft 51 side is attached to the tractor 1, and the scraping work is performed by rotating the scraping claw within the cover 52 and the flat plate 53. I do. In FIG. 3, the scraper working machine 50 is attached to the tractor 1, and the drawing of the tractor 1 is simplified and the main illustration is the tire 3.

  The electro-hydraulic cylinder 56 can be expanded and contracted to operate the rotating mechanism 57 to fold the side working portion 55 and shorten the entire width of the scraping work machine 50. The extension rake opening / closing device 60 can select whether to use the extension rake 61 by rotating the extension rake 61 left and right via the control bar 62 and the wire 63 as the internal motor rotates. . The electric hydraulic cylinder 56 and the extended rake opening / closing device 60 (motor thereof) can be operated by the operation unit of the radio unit 10 as the actuator 27, so that efficient farm work can be performed. In particular, the electric hydraulic cylinder 56 consumes a large amount of power, and is assumed to exceed the power transmitted from the power transmission unit 14 to the power reception unit 21.

  The connecting device 80 is attached to the tractor 1 and the scraping work machine 50 (work machine 2) is mounted as shown in FIG. The connection device 80 is attached to the tractor 1 by attaching the tip of the top link 5 of the tractor 1 to the attachment hole 82 installed on the front side (the tractor 1 side) at the upper center of the connection device 80. Are attached to the attachment pins 89 on both lower sides of the connecting device 80, the connecting device 80 is attached to the tractor 1.

  On the side of the scraping work machine 50 side, a connecting device (mast 71, hitch 73) for mounting on the connecting device 80 is provided. The mast 71 is attached to the upper part of the mission case 75 provided with the input shaft 51, and the left and right hitches 73 are attached to attachment plates 77 joined to frame pipes 76 at both ends of the mission case 75, respectively. A top pin 72 is provided at the tip of the mast 71, and a lower pin 74 is provided at the tip of the hitch 73.

  With the connecting device 80 attached to the tractor 1, the operator pulls the handle 91, operates the lower link 6 at the driver's seat of the tractor 1 to raise the connecting device 80, and lowers the upper portion of the connecting device 80 from the lower side. Then, the top hook 81 installed on the rear side (the side of the scraping work machine 50) is hooked on the top pin 72 of the mast 71. Then, the lower pin 74 of the hitch 73 enters the groove 88 formed on the rear side of the side plate 85 joined to both lower sides of the connecting device 80, and the tip of the joint 7 is also inserted into the input shaft 51. Thereby, the work machine 2 is supported at three points. When the handle 91 is returned (pushed) and the hook 84 interlocked with the handle 91 is locked, the mounting is completed.

  At this time, when the power transmission unit 14 is attached to the connecting device 80 side, the power receiving unit 21 is attached to the cutting work machine 50 (working machine 2) side, and the cutting work machine 50 is attached to the connecting device 80, the power transmission unit 14 And the power receiving unit 21 face each other so that the power can be supplied wirelessly, the worker gets off the tractor 1 and connects for power supply when the work implement 2 is attached to or detached from the tractor 1. There is no need. As a specific example, the power transmission unit 14 attaches the power transmission side mounting member 101 to the main pipe 83 connecting the upper member 90 (FIG. 3) side having the top hook 81 and the mounting hole 82 of the coupling device 80 and the side plate 85 side, Installed. The power transmission unit 14 is installed such that the power transmission unit 14 is arranged behind the power transmission side mounting member 101. The power receiving unit 21 is installed on the power receiving side mounting member 102 attached to the plate of the hitch 73. At this time, the power receiving side mounting member 102 is formed to extend above the hitch 73 in order to match the mounting height of the power receiving unit 21, and the power receiving unit 21 is arranged on the upper front side of the power receiving side mounting member 102. When the scraping work machine 50 is attached to the connecting device 80, the power transmission unit 14 and the power reception unit 21 face each other at the same height and the same lateral position. The approaching distance can be, for example, 0 mm to 20 mm, preferably 5 mm to 10 mm.

  In the example of FIGS. 3 to 5, the work machine side radio unit 22 and the power storage unit 23 are mounted on the cover 52, and the control unit 24 is mounted on the mission case 75.

  For example, when the operator wants to move the electrohydraulic cylinder 56, the switch 13 is turned on by turning on the key switch of the tractor 1. Then, an operation signal is sent to the work implement side radio unit 22 by operating the operation unit of the radio unit 10. By doing so, the electric hydraulic cylinder 56 can be operated by the electric power supplied from the power storage unit 23 under the control of the control unit 24.

  FIG. 6 is a schematic wiring diagram of the power feeding system for the agricultural machine according to the second embodiment. In the second embodiment, differences from the first embodiment will be mainly described, and the same portions are denoted by the same reference numerals.

  The second embodiment is different from the first embodiment in that the wireless power storage unit 28 is provided in the work unit side wireless unit 22. The wireless unit power storage unit 28 can be used as a power source for the work unit side wireless unit 22. The wireless unit power storage unit 28 includes a device having a power storage function. For example, a battery composed of a nickel metal hydride battery, a lead storage battery, a lithium ion battery, a lithium battery, or the like, a capacitor, or the like can be applied. In the second embodiment, the current control unit 42 needs to be provided in the middle of the power storage line 33 on the power receiving unit 21 side with respect to the branch line 34.

  When the switch 13 is ON, the power is basically the same as in the first embodiment, but the power from the power receiving unit 21 is also supplied to the wireless unit power storage unit 28 in addition to the work unit side wireless unit 22 and the power storage unit 23. Sent and stored. When the amount of power stored in the power storage unit 23 exceeds a certain level, the plus line 30 is disconnected by a switch in the power storage control unit 41, so that the work unit side wireless unit 22 is powered by the wireless unit power storage unit 28. Either or both of the power storage units 23 can be used. Further, when the branch point 36 is provided between the power storage control unit 41 and the power receiving unit 21, the work unit side radio unit 22 and the radio unit use unit are connected from the power receiving unit 21 even when the power storage amount of the power storage unit 23 becomes a certain level or more. Electric power can be supplied to the power storage unit 28.

  In addition, when the switch 13 is OFF, the power from the tractor battery 11 is not sent to the work implement side radio unit 22 because the wireless power feeding is not performed between the power transmission unit 14 and the power receiving unit 21. However, since the work unit side radio unit 22 operates using the radio unit power storage unit 28 as a power source, it is possible to receive a radio signal from the radio unit 10 for a certain period of time until all the stored electricity is consumed. Become. On the other hand, the electricity stored in the power storage unit 23 can be transmitted to the control unit 24, the low power device 25, the relay 26, and the actuator 27 through the power storage line 33 and the branch line 34. The operation of the actuator 27 and the low-power device 25 can be performed by operating the unit. That is, when the switch 13 is OFF or when the work implement 2 is detached from the tractor 1, the actuator 27 and the low power device 25 can be operated.

  Further, since the power storage unit 28 for the wireless unit and the power storage unit 23 are configured separately, wireless power feeding is not performed due to the action of the current control unit 42 (including cases where wireless power feeding is not properly performed). ) Is not consumed by the work unit side radio unit 22. For this reason, even when the work is resumed, the actuator 27 and the low-power device 25 can be operated without the power of the power storage unit 23 being consumed by the work implement-side radio unit 22. On the other hand, since the work implement side radio section 22 can supply power by wireless power feeding of the power transmission section 14 and the power reception section 21, the work implement 2 is attached to the tractor 1 even when the power stored in the radio section power storage section 28 runs out. If the switch 13 is turned on, communication can be immediately performed. Since the power storage unit 23 serves as a power source for the actuator 27 that requires a large output, the capacity can be made larger than that of the power storage unit 28 for the wireless unit.

  Further, in the case of the low power device 25 ′ related to the work implement side radio unit 22, it may be connected to the radio unit power storage unit 28 and used as a power source.

  FIG. 7 is an overall configuration diagram of the power feeding system for the agricultural machine according to the third embodiment. In the third embodiment, differences from the first embodiment will be mainly described, and the same portions are denoted by the same reference numerals.

  The tractor 1 includes a tractor battery 11, a power harness 12, a switch 13, and a power transmission unit 14, and the wireless unit 10 can be disposed in the vicinity of the driver seat 4 of the tractor 1 as in the first embodiment. It is.

  The work machine 2 includes a power receiving unit 21 ′, a work machine side radio unit 22, and a low power device 25. In addition, the power receiving unit 21 ′ and the work machine side radio unit 22 are electrically connected by a power supply line 32 ′, and the work machine side radio unit 22 and the low power device 25 are also connected by wiring.

  The power reception unit 21 ′ has the same wireless power feeding method as the power reception unit 21 of the first embodiment. On the other hand, the power receiving unit 21 ′ is connected to the minus line 31 ′ and the power feeding line 32 ′. One end of the minus line 31 ′ is connected to the minus side of the circuit after the wireless power feeding conversion, and the other end is connected to the minus side of the work machine side radio unit 22. One end of the power feeding line 32 ′ is connected to the plus side of the circuit after the wireless power feeding conversion, and the other end is connected to the plus side of the work machine side radio unit 22.

  The low power device 25 is the same as that of the first embodiment. However, in the third embodiment, the work machine side radio unit 22 and the low power device 25 are combined and wireless power feeding is performed between the power transmission unit 14 and the power reception unit 21 ′. Operate within the range that can be directly covered by electric power.

  When the switch 13 is ON, the power from the tractor battery 11 is sent to the power transmission unit 14 and wirelessly supplied to the power reception unit 21 '. Then, it is converted into electric power by the power receiving unit 21 ′, and can be used as a power source for the work machine side radio unit 22 through the power supply line 32 ′. That is, when the switch 13 is ON, the work implement side radio unit 22 can be in a receivable state, and a radio signal from the radio unit 10 can be received. At this time, the low-power device 25 can be further controlled based on this signal. Furthermore, it also serves as a power source for the low-power device 25 connected to the work machine side radio unit 22.

  When the switch 13 is OFF, the power from the tractor battery 11 is not sent to the power transmission unit 14. For this reason, since electricity is not sent from the power receiving unit 21 ′ to the work unit side radio unit 22 and the low power device 25, they do not operate.

  In the third embodiment, the work unit side wireless unit 22 may include the wireless unit power storage unit 28 of the second embodiment. In this case, even when the switch 13 is OFF, the work machine side radio unit 22 and the low power device 25 can be operated for a certain time.

  As described above, the embodiments of the present invention have been described. However, the present invention is not limited to the illustrated scraping work machine, and can be applied to all work machines that are attached to a tractor and perform farm work. In addition, a part of the configuration of the above-described embodiment may be applied by replacing it with a portion of the configuration of another embodiment, or may be used in combination with another configuration as necessary.

DESCRIPTION OF SYMBOLS 1 Tractor 2 Work machine 10 Radio | wireless part 11 Tractor battery 12 Power supply harness 13 Switch 14 Power transmission part 21, 21 'Power receiving part 22 Work machine side radio | wireless part 23 Power storage part 24 Control part 25 Low electric power equipment 27 Actuator 28 Power storage part 32 for radio | wireless parts , 32 'power supply line 33 power storage line 38 communication line 41 power storage control unit 42 current control unit 50 scraping work machine 56 electric hydraulic cylinder 60 extension rake opening and closing device 71 mast 73 hitch 80 coupling device 101 power transmission side mounting member 102 power receiving side mounting member

Claims (8)

A power feeding system that is applied to a work machine that is detachable from a tractor and performs farm work,
A power transmission unit installed on the tractor side and connected to the power source of the tractor via a switch, a power reception unit installed on the work machine, and a work machine side installed on the work machine and connected to the power reception unit A wireless unit, a power storage unit installed in the work machine and connected to the power receiving unit, a control unit installed in the work machine, a current control unit installed in the work machine, and installed in the work machine And an actuator
The control unit controls the actuator based on a signal received by the work implement side radio unit,
Wireless power feeding is possible from the power transmission unit to the power reception unit, and the power fed wirelessly becomes a power source of the work unit side radio unit, and is stored in the power storage unit,
The power stored in the power storage unit is supplied when the actuator is operated, and when the current control unit determines that the power receiving unit is not wirelessly powered, the power stored in the power storage unit is A power supply system for agricultural machines, which is controlled so as not to be consumed by a part. In the agricultural machinery power feeding system according to claim 1,
A determination as to whether or not wireless power feeding is being performed by the current control unit is based on whether or not the current from the power receiving unit is flowing beyond a certain level. In the agricultural machinery power feeding system according to claim 1 or 2,
A power supply system for agricultural machines, comprising: a power storage control unit that stops power transmission from the power receiving unit to the power storage unit when the power stored in the power storage unit is equal to or greater than a certain level. In the agricultural machinery power supply system according to any one of claims 1 to 3,
The power storage system for an agricultural machine, wherein the power storage unit is a battery or a capacitor. In the agricultural machinery power supply system according to any one of claims 1 to 4,
A power supply system for a farm work machine, comprising: a radio unit, wherein the work machine side radio unit receives an operation signal from the radio unit. In the electric power feeding system of the agricultural machine as described in any one of Claims 1-5,
A power supply system for an agricultural working machine, wherein the power source of the tractor is a battery of the tractor, and the switch is a switch for starting the tractor. In the agricultural machinery power supply system according to any one of claims 1 to 6,
The work machine side radio unit includes a radio unit power storage unit that stores the wirelessly fed power, and the radio unit power storage unit can be a power source for the work machine side radio unit. A power supply system for agricultural machines. A power feeding system that is applied to a work machine that is detachable from a tractor and performs farm work,
A power transmission unit installed on the tractor side and connected to the power source of the tractor via a switch, a power reception unit installed on the work machine, and a work machine side installed on the work machine and connected to the power reception unit A wireless unit, and a low-power device that is installed in the work machine and connected to the work machine side radio unit,
A power supply system for a farm work machine, wherein wireless power feeding is possible from the power transmission unit to the power receiving unit, and the power fed by the wireless power serves as a power source for the work unit side radio unit and a low power device.

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