JPH0721173B2 - Work equipment safety equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a working machine, such as a self-propelled snow remover, in which rotary power of a prime mover is transmitted to a rotary working unit via a clutch, and The present invention relates to a safety device capable of avoiding a danger that occurs when removing an external load such as snow that has stopped a rotating working unit during work.

(B) Conventional Technology FIG. 6 is a schematic side view showing the overall configuration of a self-propelled snow remover. In such a self-propelled snow remover, a running engine
The rotational power of 101 is generally transmitted to a traveling transmission 103 via a belt transmission 102, and at the same time transmitted to an auger 105 and a blower device 106, which are rotating working units, via another belt transmission 104 to rotate them. It is supposed to do. In this case, the belt transmission 102 includes the output shaft 107 of the traveling engine 101 and the transmission 10 for traveling.
The belt transmission device 104 is provided between the output shaft 107 of the traveling engine 101 and the common drive shaft 109 of the auger 105 and the blower device 106. Further, a tension clutch (not shown) is attached to each of the belt transmission devices 102 and 104 so that the transmission of the rotational power of the traveling engine 101 to the traveling transmission 103 or to the auger 105 and the blower device 106 can be disconnected. ing. Therefore, when the traveling engine 101 is in a driving state, if the tension clutch of the belt transmission device 102 is operated to the on side by the clutch lever 110, the rotational power of the traveling engine 101 is transmitted to the traveling transmission 103 via the belt transmission device 102. When the tension clutch is operated to the disengaged side, the transmission of the rotational power of the traveling engine 101 to the traveling transmission 103 is interrupted (the aircraft stops). Further, when the tension clutch of the belt transmission 104 is operated to the entry side by the clutch lever 111, the running engine 10
The rotational power of 1 is transmitted to the auger 105 and the blower device 106 via the belt transmission device 104 (the auger 105 and the blower device 106 are rotationally driven to be in the snow removal posture), and when the tension clutch is operated to the disengaged side, the vehicle travels. For engine 10
The transmission of the rotational power of 1 to the auger 105 and the blower device 106 is cut off (the auger 105 and the blower device 106 stop and become in a non-snow removal posture).

(C) Problems to be Solved by the Invention By the way, in this type of snow remover, the snow sent under pressure from the blower device 106 during the snow removing operation is clogged in the snow throwing chute 112 (due to snow quality, work speed, etc. When the snow chute 112 is clogged with snow in this way, the load (external load) of the blower device 106 increases, and the belt of the belt transmission device 104 slips, which eventually causes the blower to blow. There was a problem that the device 106 stopped and the snow removal function stopped. If this happens, shoot for snow
The snow trapped inside 112 is manually removed to restore the snow removal function. At that time, conventionally, the tension clutches of the belt transmissions 102 and 104 are operated to the disengagement side, and the traveling transmission 103, the auger 105, and the blower device 106 are operated. The transmission of the rotational power of the traveling engine 101 to the vehicle is cut off, and then the snow stuck in the snow throwing shooter 112 is removed. However, in the case of the conventional structure that requires the above procedure before performing the snow jam removal work, the snow throwing shooter 112
If there is snow inside, blower unit 10
Since 6 is in a stopped state, it is often the case that the snow clogging in the snow throwing chute 112 is removed with the tension clutch of the belt transmission device 104 kept in the input side without being operated in the disengaged side. Yes, this could lead to an unexpected accident. This is because the rotation power of the running engine 101 is being transmitted to the auger 105 and the blower device 106 with the tension clutch of the belt transmission device 104 kept on the entering side, so that the snow stuck in the snow throwing chute 112 is blocked. This is because the blower device 106 in the stopped state also returns to the rotating state when the external load is removed by removing the blocked snow.

The above-mentioned accident at the time of removing the external load is not limited to the illustrated snow blower, and the same applies to a working machine of a type in which the rotational power of the prime mover is transmitted to the rotary working unit via the clutch, such as a combine straw cutter. Has occurred in.

Therefore, the present invention has been made in view of the circumstances as described above, and when the rotary working unit stops rotating due to an external load during work, immediately stops the prime mover that gives rotary power to the rotary working unit. It is an object of the present invention to provide a safety device for a working machine capable of ensuring safety when removing an external load.

In addition, JP-A-58-42216, JP-A-58-50112, and JP-A-58-50113 disclose a technique for protecting a blower device or the like from an external load such as snow in a self-propelled snow remover. In addition, Japanese Utility Model Laid-Open No. 58-14031 discloses a technique for preventing the working device from being driven when the engine is started in a work vehicle. There is disclosed a technology for achieving safety when a user gets in and out of a mobile agricultural machine.

(D) Means for Solving the Problems In order to solve the above problems, in the present invention, when the rotary working unit is rotating, it is in the off state, and when stopped, the rotary working unit is switched to the on state to change the rotation status of the rotary working unit. The work unit switch that detects the clutch, the clutch switch that is switched to the on state when the clutch is engaged and the clutch switch that is switched to the off state when the clutch is disengaged, and the work unit switch that is switched from the off state to the on state, Also, a prime mover stop switch that is turned on to stop the prime mover when the clutch switch is in the on state, and energization delay means that delays energization to the work unit switch for a predetermined time when the clutch is switched to the clutch on state are provided. It is configured by.

(E) Action Accordingly, when the rotary working unit stops rotating due to the action of the external load during the work (at this time, the rotation driving state of the prime mover, the clutch engaged state, the rotation driving state of the rotary working unit) (at this time, the rotation driving state of the prime mover, the clutch Engagement state) The work unit switch is switched to the on state, whereby the prime mover stop switch is turned on and the prime mover is stopped (at this time, the clutch is engaged).

Then, when the work is restarted, the clutch in the engaged state is temporarily disengaged to start the prime mover, and the clutch is re-engaged so that the rotational power of the prime mover is transmitted to the rotary working unit to be in the working state. In this case, since the work unit switch is in the on state for closing the electric circuit of the safety device, when the clutch is turned on, the electric circuit is in the closing direction by the clutch switch, but the energization delay means The open state is maintained by. That is, the safety device is in a non-operating state, the prime mover does not stop, and its rotary power is transmitted to the rotary working unit. When the rotary working unit is rotated, the working unit switch is switched to the off state in which the electric circuit is opened, so that the safety device keeps the inactive state while the rotary working unit is rotationally driven.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic structure of a safety device according to the present invention applied to a self-propelled snow remover, and FIG. 2 shows a tension clutch attached to a belt transmission device of the rotary working unit (auger and blower device). 3 and FIG. 3 shows the same electric circuit.

In the figure, 1 is a transmission for traveling,
Rotational power of a traveling engine (motor) 3 is transmitted to the traveling transmission 1 via a belt transmission device 2. Reference numeral 4 denotes an auger (rotary working unit), 5 denotes a blower device (rotary working unit), and the rotational power of the traveling engine 3 is transmitted to the auger 4 and the blower device 5 via a belt transmission device 6. Reference numeral 7 is a snow throwing shooter that integrally has a blower casing 8 at the bottom.

The belt transmission device 2 includes a drive pulley 10 mounted on the output shaft 9 of the traveling engine 3, a driven pulley 12 mounted on the input shaft 11 of the traveling transmission 1, and the drive pulley 10 and the driven pulley 12. Endless belt 13 wrapped around
It is composed of and. A tension clutch (not shown) is attached to such a belt transmission device 2. When the tension clutch is turned on, the belt transmission device 2 transmits the rotational power of the traveling engine 3 to the traveling transmission 1.

The belt transmission device 6 includes a drive pulley 14 mounted on the output shaft 9 of the running engine 3, a driven pulley 16 mounted on a common drive shaft (blower shaft) 15 of the auger 4 and the blower device 5, and a drive pulley 16 for driving the same. It is composed of a pulley 14 and an endless belt 17 wound around a driven pulley 16. Further, such a belt transmission device 6 is provided with a tension clutch 18 as shown in FIG. 2, and when the tension clutch 18 is put in the engaged state, the belt transmission device 6 transmits the rotational power of the traveling engine 3. It is transmitted to the auger 4 and the blower device 5.

The tension clutch 18 includes a tension roller 19 that gives a tension force to the endless belt 17, a tension arm 20 including the tension roller 19, and a tension arm 20 that rotates about a fulcrum 21 as a rotation center. Is composed of a coil spring 22 for urging the endless belt 17 in a tensioning direction, a clutch lever 23 for remotely operating the tension arm 20, and a release wire 24 connecting the tension arm 20 and the clutch lever 23. Thus, in such a tension clutch 18, when the clutch lever 23 is set to the clutch engagement position (forward position),
When the tension roller 19 starts to tension the endless belt 17 by the urging force of the coil spring 22 (clutch engaged) and the clutch lever 23 is set to the clutch disengaged position (rear position), the tension arm 20 causes the release wire 24 to move.
As a result, the coil spring 22 rotates against the coil spring 22, whereby the tension roller 19 relaxes the endless belt 17 (clutch disengaged).

25 is a work unit switch (on, off switch) installed on the drive shaft 15, 26 is a clutch switch (on, off switch) installed near the clutch lever 23, and 27 is an engine provided in the running engine 3. A stop switch (on, off switch) 28 is an energization delay means (delay relay) installed in an electric circuit 30 that connects the battery power source 29, the work unit switch 25, the clutch switch 26, and the engine stop switch 27. The safety device includes these working unit switch 25, clutch switch 26, engine stop switch 27, and energization delay means 28.
And is configured.

When the drive shaft 15 is rotating (when the auger 4 and the blower device 5 are rotatingly driven), the work unit switch 25 is
It is in the off state, and when stopped, it is switched to the on state.

The clutch switch 26 is switched to the on state when the tension clutch 18 is in the clutch engaged state (that is, when the clutch lever 23 is set to the clutch engaged position), and when the clutch is disengaged (that is, the clutch lever 23 is set to the clutch disengaged position). If it does), it is configured to be switched to the off state. The engine stop switch 27 is used when the working unit switch 25 is switched from the off state to the on state and the clutch switch 26 is in the on state.
It is configured to be in the on state in order to stop. The engine stop switch 27 is a switch that turns on and off a device that performs fuel cut and intake shut when the running engine 3 is a diesel engine, and when the engine 3 is a spark ignition type engine (gasoline engine). It is a switch that turns on and off the drive of the ignition coil.

The energization delay means 28 is provided in series between the working unit switch 25 and the clutch switch 26, and when the tension clutch 18 is switched to the on state (that is, when the clutch switch 26 is in the on state). It is configured to delay the energization of the work unit switch 25 by a predetermined time (a time period until the rotational power of the traveling engine 3 is transmitted to the drive shaft 15 when the tension clutch 18 is turned on, for example, 2 to 3 seconds).

Next, the operation of the safety device having such a configuration will be described.

When the traveling engine 3 is rotationally driven, and the rotational power thereof is transmitted to the drive shaft 15 of the auger 4 and the blower device 5 through the belt transmission device 6 by the operation of engaging the tension clutch 18 (that is, when the snow removal posture is set). ), The electric circuit 30 of the safety device is a key switch 31 and a clutch switch 26.
Is in the on state (shown by the broken line), but the work unit switch
Since 25 is in the off state (shown by the solid line), it is open, and the engine stop switch 27 is in the non-operating state that does not turn it on.

Then, when snow clogging occurs in the snow throwing shooter 7 and the auger 4 and the blower device 5 stop rotating due to the external load caused by the snow clogging, the working unit switch 25 switches to the on state (shown by the broken line), and Then, the electric circuit 30 of the safety device is closed to be in the operating state, and the engine stop switch 27 is turned on.
That is, the traveling engine 3 is stopped. Therefore, since the rotational power of the traveling engine 3 is not transmitted to the auger 4 and the blower device 5, the blower device 5 and the like do not suddenly rotate even if the snow stuck in the snow throwing shooter 7 is removed, and the snow jam removing work is performed. Can be done safely.

When the snow clogging is removed and the snow removal work is restarted, the tension clutch 18 in the on state is temporarily turned off to start the running engine 3 (by turning on the key switch 31), and then the tension clutch 18 Is turned on to transmit the rotational power of the traveling engine 3 to the auger 4 and the blower device 5. In this case, the tension clutch 18
Although the working unit switch 25 is in the on state when the clutch switch 26 is in the on state when the clutch switch 26 is in the on state, the energization delay means 28 is turned on.
Due to this, the working unit switch 25 is not energized for a predetermined time, the open state of the electric circuit 30 is maintained during that time, the safety device is in the inoperative state, the running engine 3 is not stopped, and the rotational power of the running engine 3 is not increased. And to the blower device 5. As a result, the drive shaft 15 of the auger 4 and the blower device 5 rotates, and the working unit switch 25 switches to the off state while the open state of the electric circuit 30 is held by the energization delay means 28, and the electric circuit 30 is opened. State.

In the present invention, the clutch switch 26 is an indispensable element for enabling the running engine 3 to be started when the work is restarted, and the energization delay means 28 puts the tension clutch 18 into the on state (the clutch switch 26. Is an indispensable element for ensuring the driving state of the traveling engine 3 after (turning on). If the clutch switch 26 is not provided, the working unit switch 25 is in the on state, so the electric circuit
The switch 30 is closed at the same time when the key switch 31 is turned on, that is, the safety device is activated and the running engine 3 is not started. Further, when the energization delay means 28 is not provided, the working unit switch 25 is in the on state, and therefore, when the tension clutch 18 is turned on, the clutch switch 26 is turned on, so that the electric circuit 30 is closed, that is, the safety. The device is put into an operating state, and when the key switch 31 is turned on, the driving engine 3 being driven is stopped.

FIG. 4 shows that the above-mentioned embodiment uses a delay relay to provide an energizing delay means
In contrast to the configuration of 28, a modification in which a similar energization delay function is provided by disposing the clutch switch 26 'is shown. That is, the clutch lever 23 'is moved to a switch position further forward than the clutch engaged position, the clutch switch 26' is arranged at the switch position, and the clutch lever 23 'passes the clutch engaged position to switch. When moving to the position, turn on the clutch switch 26 '.
It is configured to be in a state. In this case, the tension clutch 18 'is engaged when the clutch lever 23' is in the clutch engaged position, but the clutch switch 26 'is engaged.
Is not turned on unless the clutch lever 23 'further moves to the switch position, and the clutch switch 26' is turned on while the clutch lever 23 'changes from the clutch on position to the switch position (time). switch
Power to 25 is delayed.

Such energization delay means is provided with an auger 4 as shown in FIG.
And a running engine 3'which is a power source of the blower device 5
Is used for a spark-ignition engine without a battery. In this case, the engine stop switch of the electric circuit 30 '
27 'is a switch for turning on / off the drive of the ignition coil, which is normally in the off state as shown in the figure (when the ignition coil is driven), and the work unit switch 2
When 5'is turned on (at this time, clutch switch 26 '
Is switched to the on state) and the driving of the ignition coil is stopped to stop the traveling engine 3 '.
When the running engine 3'is restarted, it is switched to the off state.

(G) Effect of the Invention As described above, the safety device for a working machine according to the present invention is in the off state when the rotary working parts (4,5) are rotating, and is switched to the on state when stopped. Rotating working part (4,
5) Working unit switch (25,25 ') that detects the rotation status
And a clutch switch (26, 26 ') that is switched to an on state when the clutch (18) is in a clutch engagement state and is switched to an off state when the clutch is disengaged, and a clutch state (26, 26').
When the work unit switch (25, 25 ') is switched from the off state to the on state, and the clutch switch (26, 26') is in the on state, it is turned on to stop the prime mover (3, 3 '). Motor stop switch (27,27 ') and clutch (1
8) is provided with an energization delay means (28) for delaying the energization of the working unit switch (25, 25 ') for a predetermined time when the clutch is engaged, so that the rotating working unit (4, When an external load such as snow acts on 5) and it comes to a stop, the prime mover (3,
3 ') will be automatically stopped immediately. Therefore,
Even if the external load is removed, the rotary working parts (4,5) do not suddenly rotate, so that even unskilled workers can safely remove the external load, and the prime mover (3, 3 '). Damage to the belt, clutch (18), etc. of the transmission device that transmits the rotational power of the rotating work (4, 5) to the rotating work parts (4, 5), and the rotating work parts (4,5) when foreign matter such as an empty can is caught Can be protected from damage by foreign matter. Moreover, since the prime mover (3, 3 ') in the stopped state does not start unless the clutch (18) is once disengaged, the safety at the time of removing the external load is extremely high.

Further, when the prime mover (3, 3 ') which has been stopped once is restarted to resume the work, the rotating power of the prime mover (3, 3') is transferred to the rotary working section (4, 3) by the action of the energization delay means (28). 5) can be surely transmitted, and work can be resumed without any trouble.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an embodiment in which the safety device according to the present invention is applied to a self-propelled snow remover, and FIG. 2 shows a tension clutch attached to a belt transmission device of the rotary working part. Fig. 3 is a vertical sectional front view, Fig. 3 is the same electric circuit diagram, Fig. 4 is a vertical sectional front view showing a modified example of the energization delay means, and Fig. 5 is an electric circuit diagram when applied to a spark ignition engine without a battery. FIG. 6 is a schematic side view showing a conventional self-propelled snow remover. 3,3 '... Running engine (motor), 4 Auger (rotating work part), 5 Blower device (rotating work part), 18 ... Tension clutch, 25,25' ... Work part switch, 26,26 '...
Clutch switch, 27, 27 '... Engine stop switch (motor stop switch), 28 ... Energization delay means.

Claims (1)

[Claims] 1. The rotating power of the prime mover (3, 3 ') is the clutch (1).
8) A safety device for a working machine transmitted to the rotary working unit (4,5) via the rotary working unit (4,5), which is in an off state when the rotary working unit (4,5) is rotating and is in an on state when stopped. The working unit switch (25, 25 ') that is switched to detect the rotation status of the rotating working unit (4,5) and the clutch (18) are switched on when the clutch is engaged and off when the clutch is disengaged. A clutch switch (26, 26 ') that is switched to detect the clutch status, and the working unit switch (25, 25')
Is switched from the off state to the on state, and when the clutch switch (26, 26 ') is in the on state, the prime mover stop switch (27, 27) is brought to the on state to stop the prime mover (3, 3'). ') And the working unit switch (25, 2) when the clutch (18) is switched to the clutch-on state.
Energizing delay means (2) for delaying energization to 5 ') for a predetermined time
8) A safety device for a working machine, characterized by being configured with and.