JPH079667U - Wiper mechanism in cabin of excavator - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a wiper drive circuit in an excavating work machine capable of preventing burnout of a wiper motor. [Structure] In the present invention, a wiper drive motor (M) is connected to the wiper drive circuit (a), the motor (M) is attached to the front wall (6d) of the cabin (6), and the wiper drive circuit is further installed. Wiper blade (15) interlockingly connected to the motor (M)
Windshield mounted on the front of the cabin (6)
The windshield (7) is disposed in contact with the windshield (7) so that the surface of the windshield (7) can be wiped off.
A wiper drive circuit for a wiper mechanism in a cabin of an excavator that can be stored in either the upper or lower side.
The circuit switching means (E) and the alarm device (D) are provided in (a), and when the electric load on the wiper drive motor (M) side increases, the circuit switching means (E) causes the wiper drive motor ( The power supply to the M) side is cut off and the alarm device (D) is activated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a wiper drive circuit in an excavator that can prevent a wiper motor from burning.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, there are two types of excavating work machines, in which the control section and the driver's seat are opened, and in which a cabin for accommodating them is provided.

Then, in the cabin of the excavator, for example, a front split windshield that is vertically slidable is provided, and a wiper mechanism for wiping rainwater off the windshield is also provided. There is one that has.

The wiper blade, which is the main component of the wiper mechanism, has its base end swingably attached to the upper front part of the cabin, and the wiping part made of a rubber body is arranged in close contact with the upper windshield. There is.

As a wiper drive circuit X for driving the wiper mechanism, as shown in FIG. 9, a battery 51 and a wiper drive motor 52 are connected by wiring, and a wiper switch 53 and a fuse 54 are provided between them. And are connected.

[0006]

[Problems to be solved by the device]

 However, the wiper mechanism in the cabin of the excavator mentioned above has the blade portion of the wiper blade, which is the main body of the wiper mechanism, abutting against the surface of the windshield while being urged. If you lower the upper windshield, you will not be able to receive the blade and the wiper blade will get inside the cabin.

Therefore, when the driver opens the windshield, the driver places it on the window frame of the windshield to support the wiper blade.

However, if the wiper switch 53 is accidentally actuated in such a state, in that case, the wiper blade is supported on the window frame body and does not move. Motor motor 52 was sometimes burned out.

An object of the present invention is to provide a wiper mechanism in a cabin of an excavating work machine that can solve the above problems.

[0010]

[Means for solving the problem]

 According to the present invention, a wiper drive motor is connected to a wiper drive circuit, the motor is attached to the front wall of the cabin, and a wiper blade that is linked to the wiper drive motor is attached to the front of the cabin. A windshield wiper mechanism in a cabin of an excavator that is disposed in contact with a windshield so that the surface of the windshield can be wiped, and the windshield can be stored on either the upper or lower side. The wiper drive circuit is provided with a circuit switching means and an alarm device, and when the electric load on the wiper drive motor side increases, the circuit switching means shuts off the power supply to the wiper drive motor side and the alarm device. The present invention relates to a wiper mechanism in a cabin of an excavator, which is characterized by being configured to operate.

[0011]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a side view of an excavator equipped with a wiper mechanism according to the present invention, FIG. 2 is an explanatory view of a cabin of the excavator, and FIG. 3 is a wiper drive circuit of the wiper mechanism according to the present invention. It is an explanatory view shown.

As shown in FIG. 1, the excavator A is equipped with a swivel base 2 having a substantially semi-circular shape at the center of a crawler type traveling device 1 via a swivel bearing 3, and A bonnet 5 accommodating a prime mover, a fuel tank, and the like (not shown) is arranged on the top.

Further, a working machine connecting portion 8 is provided at the center of the front part of the swivel base 2, and a bucket 10, a boom 11, an arm 12 and the like for carrying out excavation work are supported by the connecting portion 8. A boom bracket 9 for attaching the boom is attached, and the excavation work section c is connected to the lifting / lowering and rotating units via the bracket 9.

In FIG. 1, 10a is a bucket cylinder, 11a is a boom cylinder, 12a is an arm cylinder, 13 is a blade having a soil discharging work and a stabilizer function, and 14 is an operating cylinder for moving the blade 13 up and down. Is.

A cabin 6 is provided on the left side with respect to the traveling direction, and accommodates a control unit, a driver's seat, and the like.

The cabin 6 is provided with a windshield 7 at the front part thereof, and is further provided with a wiper mechanism W for wiping off water drops and the like from the glass 7.

That is, as shown in FIG. 2, a two-part windshield 7 capable of vertical sliding is provided over substantially the entire front wall 6d of the cabin 6, and the cabin 2 is provided above the windshield 7. A base end 15a of a wiper blade 15 forming a part of the wiper mechanism W is attached to an upper portion of the front wall 6d of the wiper 6. In FIG. 2, 6a is an entrance / exit door, 6b is a handle, and 6c is a window frame of the windshield 7.

A base end 15a of the wiper blade 15 is rotatably interlocked with an upper center of a front wall 6d of the cabin 6, and a wiping portion 15b formed of a rubber blade is attached to the upper glass 7a of the front glass 7. Installed in a state of being biased to.

As shown in the wiper drive circuit a of FIG. 3A, the wiper blade 15 is interlockingly connected to a wiper drive motor M that is wire-connected to the battery B, and is operated by operating the wiper switch S. To do. H is a fuse.

That is, in normal operation, when the wiper switch S provided in the cabin 6 is operated, the wiper drive motor M drives the wiper blade 15 to rotate left and right, and the blade 15 wipes the wiping portion 15b. While it is in close contact with the glass surface, rotate to the left and right to wipe off water drops and the like adhering to the glass surface.

The construction of the excavating work machine A in the present embodiment is as described above, and the gist of the present invention is that in the wiper mechanism W attached to the cabin 6 of the excavating work machine A, the wiper drive circuit a is The circuit switching means E and the alarm D are provided, and when the electric load on the wiper driving motor M side increases, the circuit switching means E shuts off the power supply to the wiper driving motor M side and outputs an alarm. Device D is configured to operate.

That is, in this embodiment, as shown in FIG. 3A, the temperature detection sensor 21 is attached to the wiper drive motor M in the wiper drive circuit a, and the sensor 21 and the circuit switching means E are attached. Are connected via the control unit 22, and the alarm D is connected to the circuit switching means E.

The control unit 22 stores a safety threshold value for preventing the wiper driving motor M from being seized, and also detects that the detected value from the temperature detection sensor 21 exceeds the threshold value. When judged, the switching instruction signal is output to the circuit switching means E, and the alarm device D is mounted in the cabin 6 so that the horn sounds when energized.

Here, the circuit switching operation of the wiper mechanism W in the present embodiment will be described with reference to FIGS. 2 and 3B and 3C, and FIG.

In FIG. 2, when the operator of the excavation work machine A lowers the upper glass 7a of the front glass 7 and stores it downward to open the front portion of the cabin 6 for ventilation or the like, for example. Since the blade 15 is biased toward the upper glass 7a side, the wiper blade 15 is in a state of having entered the cabin 6 without the upper glass 7a.

In such a state, it interferes with the driver, so the driver puts the wiper blade 15 on the window frame 6c and supports it, as shown by the phantom line in FIG.

In such a state, as shown in FIG. 4, if the driver mistakenly turns on the wiper switch S (101), the wiper blade 15 cannot be rotated and the wiper drive motor is not rotated. M gradually enters the overload state (102) (see FIG. 3 (b)).

When the motor M becomes overloaded, it gradually becomes hot, and the temperature detection sensor 21 detects the temperature of the heat, and the control unit 22 judges that the detected value exceeds the safety threshold. Then (103), a circuit switching instruction signal is output to the circuit switching means E (104), and the circuit switching means E switches the direction of current to the alarm D side (105) (see FIG. 3 (c)). ).

Therefore, the power supply to the wiper drive motor M is cut off to prevent burning due to overheating, and the current flows to the alarm D side to sound the horn (106), and the driver turns on the wiper switch S. I can inform you that it has become.

The controller 22 determines from the detection value from the temperature detection sensor 21 that the driver turns off the wiper switch S or the temperature of the wiper driving motor M is lowered to reach a predetermined temperature. Then, (107), the control unit 22 outputs a signal to the circuit switching means E to restore the normal circuit (108).

As described above, by providing the alarm device D and the circuit switching means E in the wiper drive circuit a, it is possible to prevent the burner drive motor M from being burnt out, and the maintenance cost required for repair and the like. Can be reduced.

Further, even when the windshield 7 is opened, the wiper drive motor M is burned out even if the driver mistakenly operates the wiper switch S by turning the wiper operation off. Never.

Further, when the wiper drive motor M is overloaded and overheated, the alarm D can alert the driver with a horn, so the driver notices and immediately turns off the wiper switch S. You can

As the circuit switching means E, in addition to the above, a breaker such as a limit switch is provided in the wiper drive circuit a so that a current is supplied to the alarm device D at the same time when the breaker is activated, Alternatively, it is conceivable that the bimetal is attached to the wiper drive motor M by using bimetal, and the contact is switched by heat to change the direction of current flow to the wiper drive motor M side or the alarm D side. It

Next, another embodiment shown in FIG. 5 will be described.

This is a case where an alarm circuit F is provided in the wiper drive circuit a instead of the circuit switching means E, and when the wiper drive motor M, which is an electrical load, malfunctions for some reason. The alarm buzzer 31 is activated.

The alarm circuit F includes, for example, a current detection resistor R ₃ and comparison resistors R ₁ and R ₂ for detecting a current flowing through the wiper driving motor M, a comparator 32, and an alarm buzzer 31. Therefore, the comparator 32 is a circuit that compares the voltages V1 and V2 at the P ₁ point and the P ₂ point to open the output, or switches to the GND. 33 is a diode.

Explaining the operation, if the wiper driving motor M is normal, the current I ₂ flowing through the motor M is small, the output of the comparator 32 becomes open, and the current I ₃ flowing to the alarm buzzer 31 flows. Without this, the alarm buzzer 31 does not sound.

However, when the wiper driving motor M is overloaded, the current I ₂ flowing through the motor M increases, and therefore V ₃ > V _1, and the output of the comparator 32 becomes the GND side. The current I ₃ flows to the buzzer 31 and sounds the buzzer.

Therefore, since the driver can be warned by the operation of the alarm buzzer 31, it is possible to prevent the electric load such as the wiper driving motor M from burning.

In the present embodiment, the electric load is the wiper driving motor M, but this is not limited to the motor M, but various motors such as a stop solenoid can be applied.

Further, as shown in FIG. 6, the actuator 34 is attached to the operation switch such as the wiper switch S, the actuator 34 and the comparator 32 are connected, and the current I ₃ flows and the buzzer sounds. At the same time, the actuator 34 may be operated and the wiper switch S 2 may be turned off.

Next, the pedal lock structure of the operation pedal 41 included in the excavator A shown in FIGS. 7 and 8 will be described.

In general, when the PTO is mounted, a pedal lock 43 corresponding to a hydraulic actuator such as a hand breaker is attached so that the pedal can be locked at a desired pedal stroke position.

As shown in FIG. 7, the pedal lock structure described below attaches the pedal lock 43 to the side of the operation pedal 41 provided on the step surface 40 at the foot of the driver, and When the pedal cover 42 is attached to the front so that it can be laid down, and the cover 42 is tilted, the state shown by the phantom line in FIG. 8 is obtained, and the operation pedal 41 and the pedal lock 43 can be simultaneously covered. There is.

When the pedal cover 42 is tilted down, the cover 42 can be used as a footrest.

As shown in FIG. 8, the pedal lock 43 is formed by a substantially inverted J-shaped pin, and a spring 44 is attached to the base portion and urges downward.

When the operation pedal 41 is supported and fixed at a desired position, the pedal lock 43 is pulled up and the tip of the pedal lock 43 is inserted into the lock pin insertion hole 41a provided in the operation pedal 41.

Since the pedal lock 43 can be stored in the pedal cover 42 as described above, the pedal lock 43 can be protected from dirt, stones, etc., so that malfunctions and the like will not occur, and the driver's foot will not operate correctly. Never.

The operation lock 41 can be reliably supported and fixed by the pedal lock 43, and there is no possibility that the pedal lock 42 malfunctions due to vibration of the machine body when not in use.

Further, by using a shim or the like when mounting the pedal lock 43, the stroke of the operation pedal 41 can be arbitrarily adjusted, so that it is possible to easily cope with different hydraulic extraction amounts for each excavating work machine A. Become.

[0053]

[Effect of device]

 As described above, according to the present invention, the wiper drive motor is connected to the wiper drive circuit, the motor is attached to the front wall of the cabin, and the wiper blade is connected to the wiper drive motor in an interlocking manner. The excavator is arranged in contact with the windshield mounted on the front of the cabin so that the surface of the windshield can be wiped, and the windshield can be stored either on the upper or lower side. In the cabin wiper mechanism, the wiper drive circuit is provided with a circuit switching means and an alarm device, and when the electric load on the wiper drive motor side increases, the circuit switching means energizes the wiper drive motor side. It is possible to prevent the burner of the wiper drive motor from being burned out by shutting off and activating the alarm. Come, it is possible to reduce the maintenance cost of repairs, etc..

Further, even when the windshield is stored above or below and the windshield is opened, the wiper drive motor is burned out even if the driver mistakenly operates the wiper switch when the wiper cannot be operated. There is nothing to do.

Furthermore, when the wiper drive motor becomes overloaded and overheats, the horn can alert the driver by the alarm device, so the driver notices and immediately turns off the wiper switch. be able to.

[Brief description of drawings]

FIG. 1 is a side view of an excavating work machine including a wiper mechanism according to the present invention.

FIG. 2 is an explanatory diagram of a cabin of the excavating work machine.

FIG. 3 is an explanatory view showing a wiper drive circuit of the wiper mechanism according to the present invention.

FIG. 4 is a flowchart showing an operation of the wiper mechanism.

FIG. 5 is an explanatory diagram showing a wiper drive circuit of a wiper mechanism according to another embodiment.

FIG. 6 is an explanatory diagram showing a wiper drive circuit of a wiper mechanism according to another embodiment.

FIG. 7 is an explanatory diagram showing a pedal lock structure of an operation pedal.

8 is a cross-sectional view taken along line I-I of FIG.

FIG. 9 is an explanatory diagram showing a conventional wiper drive circuit.

[Explanation of symbols]

 a Wiper drive circuit D Alarm device E Circuit switching means M Wiper drive motor 6 Cabin 6d Front wall 7 Windshield 15 Wiper blade

Claims (1)

[Scope of utility model registration request] 1. A wiper drive circuit (a) is connected to a wiper drive motor (M), and the motor (M) is connected to a cabin.
It is attached to the front wall (6d) of (6), and the wiper blade (15) interlockingly connected to the wiper drive motor (M) is brought into contact with the windshield (7) attached to the front of the cabin (6). The windshield (7) can be wiped over the surface of the windshield (7), and the windshield (7) can be stored in either the upper or lower side. The drive circuit (a) is provided with a circuit switching means (E) and an alarm device (D), and when the electric load on the wiper drive motor (M) side increases, the circuit switching means (E) is used to drive the wiper. A wiper mechanism in a cabin of an excavator, which is configured to cut off energization to the motor (M) side and activate an alarm (D).