JP3247019B2 - Alarm device for self-propelled construction waste crusher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alarm device for a self-propelled construction waste material crusher which performs a crushing treatment for recycling construction waste materials such as concrete waste and asphalt waste.

[0002]

FIG. 7 is a perspective view showing a self-propelled construction waste material crusher 1 according to an embodiment of the prior art. In the figure, 2 is a crawler traveling body of the self-propelled construction waste material crusher 1, 3 is a main body, 4 is a side step of the main body 4, 5 is a hopper,
Reference numeral 6 denotes a feeder, 7 denotes a crusher, 8 denotes a conveyor, 9 denotes an operation panel, and 10 denotes various switches provided on the operation panel 9. In the self-propelled construction waste material crusher 1 shown in FIG. 7, a main body 3 is connected to an upper part of a crawler traveling body 2, and a concrete gallery (not shown) is provided on an upper front side of the main body 3.
A hopper 5 is provided for receiving construction waste and the like.
Is supplied to the crusher 7 by a feeder 6 from a discharge port below the hopper 5 and is crushed into predetermined fine particles.
The operation of various actuators such as the feeder 6, the crusher 7, and the conveyor 8 is controlled by operating the various switches 10 of the operation panel 9 provided on the side surface of the main vehicle body 3. To do it.

[0003]

During the crushing operation of the self-propelled construction waste material crusher, for example, the reinforcing steel, the steel frame, etc. are mixed in the concrete rag supplied to the hopper, and the feeder feed condition and the crusher condition of the crusher suddenly become abnormal. It may be. In this case, the emergency stop switch arranged on the operation panel is turned on to simultaneously stop the operation of all actuators such as the feeder, crusher, and conveyor. Then, the cause of the abnormality is investigated, for example, the reinforcing bar, the steel frame, etc. are removed, and the emergency stop switch is returned to the off state in order to restart the operation. However, in this case, it is necessary to keep all the work switches for operating the various actuators in the off state. In order to confirm the on / off state, there is also an operation panel provided with a means for providing a lamp that can be displayed by turning on and off each work switch, but it is difficult to see the lamp display when irradiating sunlight. is there. An object of the present invention is to provide an alarm device that can solve the above problems.

[0004]

In the alarm system according to the first embodiment of the present invention, a main vehicle body is connected to an upper portion of a crawler traveling body, and a hopper for receiving construction waste such as concrete waste is provided above the main vehicle body. The construction waste material supplied to the hopper is fed into the crusher by a feeder from a discharge port at the lower part of the hopper, crushed into predetermined fine particles, and the crushed construction waste material is carried out by a conveyor arranged below the crusher. In a self-propelled construction waste material crusher, the operation control of various actuators such as the feeder, crusher, and conveyor is performed by operating a plurality of operation switches disposed on a main vehicle body. A travel / work switch is provided in the electric circuit to switch between a travel position contact and a work position contact. When the work position contact of the industrial changeover switch is connected to ground, and a self-holding emergency stop alternate switch with multiple changeover contacts is connected to the power supply, and the emergency stop alternate switch is in the off state A power supply voltage is applied to each solenoid of the actuator control electromagnetic switching valve, a buzzer connection circuit and a circuit leading to the work position contact are opened, and a plurality of work switches are connected downstream of each of the solenoids. Each diode provided on the side is interposed in the electric path leading to the work position contact of the traveling / work changeover switch, respectively.
In addition, the power supply and the upstream contact of each work switch are connected to each other via a lamp, and the downstream electric circuit of the buzzer is connected to each downstream electric circuit of the lamp via a diode, so that an emergency stop is performed. The buzzer connection circuit is maintained energized when the alternate switch for use and at least one work switch are in the on-operation state.

Next, in a second embodiment of the alarm device of the present invention, an upper operation panel is provided at a high position above a main body of a self-propelled construction waste crusher, and a lower operation panel is provided at a low position near the ground. The upper and lower operation panels are turned off and on by one of the push-in and pull-out operations.
A self-holding work alternate switch that can be switched on is arranged corresponding to each actuator, and each work alternate switch in the upper operation panel and each work alternate switch in the lower operation panel that operates the same actuator are arranged. One-side contact and one-side contact, and the other-side contact and the other-side contact are connected by wiring, respectively,
A traveling / work switching switch capable of switching between a traveling position contact and a working position contact is provided in one of the electric circuits of the upper operation panel and the lower operation panel, and the working position contact is connected to ground. A self-holding type emergency stop alternate switch having a switching contact is provided on each of the upper and lower operation panels, and when the emergency stop alternate switch is off, the power supply voltage is applied to each solenoid of the actuator control electromagnetic switching valve. At the same time, the buzzer connection circuit and the circuit leading to the above-mentioned working position contact are opened, and one terminal of the solenoid of the electromagnetic switching valve for controlling various actuators is connected in parallel to the power supply side contact of the emergency stop alternate switch. And the other terminal of each of the above solenoids is connected to each diode and each work alternator. Lamps which are connected to the above-mentioned working position contacts via switches, and which apply a power supply voltage to the working and emergency stop alternate switches are arranged, and the downstream wiring of each of the lamps corresponds to each of the above-mentioned lamps. While grounding through each alternate switch, the downstream electric circuit of the buzzer is connected to each downstream electric circuit of the lamp via a diode, respectively, and the emergency stop alternate switch and at least one set of work alternate switches are connected. The buzzer connection circuit is kept energized when the switches are in the ON operation state.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment A self-propelled construction waste crusher equipped with an alarm device according to a first embodiment of the present invention performs an emergency stop when a crushing operation is performed by turning on all operation switches for operating various actuators. Turn on the alternate switch. Among the plurality of switching contacts provided in the self-holding type emergency stop alternate switch, the contact for the power supply circuit is opened, and the contact for the ground circuit and the contact for the buzzer circuit close the circuit. All solenoids of various solenoid control valves for controlling various actuators connected in parallel downstream of the power circuit contacts are de-energized, so that all actuator operations are stopped, but the work switches are closed to ON. The lamps that indicate the on-states of the switches remain lit while the switches are on. At the same time, the current from the power supply flows to the ground via the closed buzzer circuit contact of the emergency stop alternate switch, the buzzer, the diode, and the working position contact of the on / off work switch travel / work changeover switch. A part of the current from the lamp passes through a lamp that displays the on / off status of the emergency stop alternate switch, a ground circuit contact of the emergency stop alternate switch, and a work position contact of the travel / work changeover switch.
Flows to ground. Therefore, the buzzer sounds and the lamp for turning on the emergency stop alternate switch is continuously turned on.

[0007] After the emergency stop alternate switch is turned on as described above, a process of eliminating the abnormality of the self-propelled construction waste crusher is performed. Here, all the work switches are turned off. For this purpose, the work switch is sequentially turned off. The lamp that indicates the switch that has been turned off is turned off because the circuit on the ground side is open, but if at least one of the work switches is turned on, the current from the power supply will be stopped immediately. Through the closed buzzer circuit contact, buzzer, and diode of the alternate switch, the single work switch in the ON state, and the work position contact of the traveling / work changeover switch. Therefore, the sound of the buzzer and the lighting of the lamp for turning on the emergency stop alternate switch are continued. However, if all the work switches are turned off, the ground circuit on the downstream side of the buzzer is opened, and the buzzer stops sounding. However, since the emergency stop alternate switch is on, the current from the power supply flows to the ground via the lamp, the earth circuit contact of the emergency stop alternate switch, and the work position contact of the traveling / work changeover switch. Lighting of the lamp indicating the ON state of the alternate switch is continued. Even if the emergency stop alternate switch is returned to the off state in this state, since all the operation switches are open, the actuator does not start moving. When the emergency stop alternate switch is returned to the off state, the ground circuit contact, that is, the downstream circuit of the lamp for performing the on / off display of the emergency stop alternate switch is opened, so that the lamp is turned off.

In the alarm device according to the second embodiment of the present invention, an upper operation panel is provided at a high position above the main vehicle body, and a lower operation panel is provided at a low position near the ground. An alternate switch for operation was arranged so that it could be operated from the operation panel on the side, and an alternate switch for emergency stop and a buzzer were arranged on both operation panels. Although the alarm device of the second embodiment is constituted by two sets of operation panels, its operation is the same as that of the alarm device of the first embodiment.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a circuit diagram of an alarm device according to a first embodiment of the present invention. In the figure, reference numeral 11 denotes an operation panel (shown by phantom lines) provided in a self-propelled construction waste material crusher, 12 denotes a traveling / work switching switch, 13 denotes a main control electromagnetic switching valve, and 14 and 1.
Reference numerals 5, 16, and 17 denote working switches for operating the crusher control electromagnetic switching valve 18, the conveyor control electromagnetic switching valve 19, the feeder control electromagnetic switching valve 20, and the generator control electromagnetic switching valve 21, respectively. Reference numeral 22 denotes a horn switch. , 2
Reference numerals 3 to 26 denote work switches 14 to 17, respectively.
, An on / off display lamp provided for the emergency stop alternate switch 27, an on / off display lamp provided for the emergency stop alternate switch 27, an alarm buzzer 29, Is a power supply, 31 is a traveling motor control electromagnetic switching valve, and 32,.
The diodes 36,..., And 39, which are provided in parallel with the downstream electric circuit of No. 9 and communicate with the earth,
The diodes 8 to 21 are provided on the downstream side of the solenoid and connected to the ground.

Next, the configuration of the alarm device according to the first embodiment of the present invention will be described with reference to FIG. In the present invention, a traveling / work switching switch 12 capable of switching between a traveling position contact 40 and a working position contact 41 is provided in an electric circuit in which the respective work switches 14, to 17 of the self-propelled construction waste crusher are arranged. The work position contact 41 of the traveling / work changeover switch 12 is connected to ground, and a plurality of changeover contacts, that is, a power circuit contact 42, a ground circuit contact 43, and a buzzer circuit contact 44 are provided.
A self-holding type emergency stop alternating switch 27 provided with a power supply 30 is connected to a power supply 30. When the emergency stop alternating switch 27 is in an off state, the solenoids of the actuator control electromagnetic switching valves 18, 21 and 21 (FIG. (Not shown), a connection circuit of the buzzer 29 and a circuit leading to the work position contact 41 are opened, and a plurality of work switches 1 are provided.
4 to 17 are provided on the electric paths leading to the working position contacts 41 of the traveling / work changeover switch 12 from the diodes 36, 39 provided on the downstream side of the solenoids, respectively. Work switches 14, 17
Are connected to the lamps 23, ~,
26, and the downstream electric circuit of the buzzer 29 is connected to the downstream electric circuits of the lamps 23,..., 26 via the diodes 32,. The configuration is such that the connection circuit of the buzzer 29 is kept energized when the switch 27 and at least one work switch are in the on-operation state.

Next, the operation of the alarm device according to the first embodiment of the present invention will be described. The self-propelled construction waste crusher equipped with the alarm circuit shown in FIG.
When the crushing operation is performed with the switch 17 turned on, the emergency stop alternate switch 27 is turned on. Among the plurality of switching contacts provided in the emergency stop alternate switch 27, the power circuit contact 42 is opened, and the earth circuit contact 43 and the buzzer circuit contact 44 close the respective circuits. All the solenoids of the electromagnetic switching valves 18, 21 connected in parallel downstream of the power supply circuit contact 42 are de-energized, so that the operation of all actuators is stopped. 17 remains closed in the on state, and the lamps 23, 26, which indicate the on state of the switches 14, 17 are kept lit. At the same time, the current from the power supply 30 is supplied to the closed buzzer circuit contact 44 of the emergency stop alternate switch 27, the buzzer 29, the diodes 32,.
The work switches 14 to 17 in the ON state and the work position contact 41 of the traveling / work changeover switch 12 flow to the ground, and a part of the current from the power supply 30 is turned on and off by the emergency stop alternate switch 27. The current flows to the ground via the lamp 28 for performing the OFF display, the ground circuit contact 43, and the work position contact 41 of the traveling / work changeover switch 12. Therefore, the buzzer 29 is sounded and the lamp 28 for displaying the emergency stop alternate switch 27 is continuously turned on.

After the emergency stop alternate switch 27 is turned on as described above, the process for eliminating the abnormality of the self-propelled construction waste material crusher is performed. Here, all the work switches 14,. Turn off. It is assumed that the lamps 23 to 26 are turned off. For example, it is assumed that the lighting of the lamp is difficult to see and only one work switch 16 is not turned off. In this state, the current from the power supply 30 is supplied to the buzzer circuit contact 44 and the buzzer 2 when the emergency stop alternate switch 27 is closed.
9, the diode 34, the working switch 16 in the ON state,
It flows to the ground via the work position contact 41 of the traveling / work changeover switch 12. Therefore, when the buzzer 29 sounds,
The lighting of the lamp 28 for performing the ON display of the emergency stop alternate switch 27 is continued. As a result, the driver hears that the buzzer 29 will continue to sound, and
It can be recognized that any one of the work switches 4 to 17 is still in the ON state.

However, here, the work switches 14,.
When all the switches 7 are turned off, the grounding circuit downstream of the buzzer 29 is opened, and the buzzer 29 is de-energized and its sounding stops. However, since the emergency stop alternate switch 27 is in the ON state, the current from the power supply 30 is supplied to the lamp 28 and the emergency stop alternate switch 27.
Ground circuit contact 43, running / work changeover switch 12
The lamp 28 continues to flow since the current flows through the work position contact 41 to the ground. In this state, even if the emergency stop alternate switch 27 is returned to the off state,
Since all the working switches 14, to 17 are open, there is no problem that the actuator starts to move. Also, when the emergency stop alternate switch 27 is returned to the off state by the above-mentioned off operation, the ground circuit contact 43, that is, the downstream circuit of the lamp 28 is opened, so that the lamp 28 is turned off.

FIG. 2 is a partially cutaway side view of a self-propelled construction waste material crusher 45 equipped with an alarm device according to a second embodiment of the present invention. In the figure, 46 is a self-propelled construction waste material crusher 4
5 is a crawler traveling body, 47L and 47R are left and right traveling motors, 48 is a main vehicle body, 49 is a hopper, 50 is construction waste material to be crushed, 51 is a crusher 52 for construction waste material 50.
(Inside the main body 48, not shown), a feeder 53, a conveyor 53, and a lower operation panel 54. FIG. 3 is a rear view of a main part as viewed from A in FIG. In the figure, 55 is an upper operation panel. FIG. 4 is an enlarged view of the upper operation panel 55 in FIG. In the figure, 27 '
Is an emergency stop alternate switch. FIG. 5 is an enlarged view of the lower operation panel 54 in FIG. In the figure, 56 is a key switch for an engine (not shown), 12 is a run / work switch, and 27 is an emergency stop alternate switch. FIG. 6 is a circuit diagram of the alarm device according to the second embodiment of the present invention. In the figure, the same reference numerals are given to those using the same components as the alarm device of the first embodiment. 57, 57 'are working alternate switches for operating the crusher control electromagnetic switching valve 18, 58, 5
8 'is a work alternate switch for operating the conveyor control electromagnetic switching valve 19; 59, 59' is a work alternate switch for operating the feeder control electromagnetic switching valve 20; 60, 60 'is a generator control electromagnetic switch valve 21;
Alternate switches for operating the switches, 22, 22 '
Is a horn switch, 23, 23 ', 24, 24', 2
5, 25 ', 26, 26' are working alternate switches 57, 57 ', 58, 58', 59, 5 respectively.
Lamps for lighting indication provided for 9 ', 60, 60', 42 ', 43', 44 'are a power circuit contact, a ground circuit contact, and a buzzer provided in the emergency stop alternate switch 27', respectively. A circuit contact 28 'is an on / off display lamp provided for the emergency stop alternate switch 27', and 29 and 29 'are alarm buzzers.

Next, the self-propelled construction waste material crusher 44 according to the present invention.
The configuration of the alarm device of the second embodiment will be described with reference to FIGS. In the present invention, the upper operation panel 55 is provided at a high position above the main body 45 and the lower operation panel 5 is provided at a low position near the ground.
A self-maintenance type working alternate switch (57 ',..., 60') in which upper and lower operation panels 55 and 54 can switch one side contact and the other side contact on and off by push-in / pull-out operations. ', 57, ~, 60)
To various actuators (feeder 51, crusher 52,
Conveyor 53, etc.).
A work alternate switch 57 'in the upper operation panel 55 (because a plurality of work alternate switches 57', ..., 60 'are arranged, the work alternate switch 57' for the crusher 52 will be described as a representative) 57 ' And a work alternate switch (work alternate switch 5) in the lower operation panel 54 for operating the same crusher 52.
7 will be described as a representative).
1 'and the one-side contact 61, and the other-side contact 62' and the other-side contact 62 are connected by wirings 63 and 64, and the electric circuit in one of the upper operation panel 55 and the lower operation panel 54 The lower operation panel 54 is provided with a traveling / work switching switch 12 which can be operated to switch between the traveling position contact 40 and the working position contact 41.
1 to ground and a plurality of switching contacts 42 ', 4
Self-holding emergency stop alternate switches 27 ', 27 having 3', 44 ', 42, 43, 44 are provided on the upper operation panel 55 and the lower operation panel 54, respectively, and the emergency stop alternate switch 27' is provided. And 27, the actuator control solenoid-operated directional control valves 18,.
A power supply 30 voltage is applied to each of the solenoids 1 and a connection circuit of the buzzers 29 'and 29 and a circuit leading to the work position contact 41 of the traveling / work changeover switch 12 are opened. 2
The power supply circuit contacts 42 'and 42 corresponding to the phases 7' and 27, the ground circuit contacts 43 'and 43, and the buzzer circuit contacts 44' and 44 communicate with each other.
One terminal of the solenoid of each of the various solenoid control valves 18 to 21 for controlling the actuator is connected in parallel to the downstream side of the power circuit contact 42, and the other terminal of each of the solenoids is connected to each of the diodes 36 to 39. Alternate switches 57-57 ', 58-58', 60-6 for each operation
0 'is connected to the work position contact 41 of the traveling / work changeover switch 12 and the work alternate switch 5
Lamps 23, 23 ', 24, 2 in which a power supply 30 voltage is applied to 7, 57', 58, 58 ', ..., 60, 60' and the emergency stop alternate switches 27, 27 '.
4 ', ..., 26, 26' and 28, 28 ', respectively, and the downstream wiring of each lamp is grounded via an alternate switch corresponding to each lamp, and the downstream side of buzzers 29, 29'. The electric circuit is connected to each electric circuit on the downstream side of the lamp through diodes 32, 35, and 35, respectively, and at least one set (one actuator) of the emergency stop alternate switch 27 or 27 'and the work alternate switch is used. The work alternate switch is provided on each of the lower operation panel and the upper operation panel, so that the on / off operation can be performed from either operation panel.) The configuration is such that the connection circuit of the buzzers 29 and 29 'is kept energized by being in the operating state.

Next, the operation of the alarm device according to the second embodiment of the present invention will be described. In the alarm device of the second embodiment, an upper operation panel 55 is provided at a high position above the main vehicle body 48, and a lower operation panel 54 is provided at a low position near the ground, and various actuators are provided on either the upper or lower operation panel. Work alternate switch 57 ', ..., 6 so that it can be operated from
0 ′, 57,..., 60, and both operation panels 55, 5
4 is an alternate stop switch 27 'for emergency stop,
27 and buzzers 29 'and 29 are arranged. The alarm device of the second embodiment includes an upper operation panel 55 and a lower operation panel 54, and the operation is the same as that of the alarm device of the first embodiment. In this embodiment, for the sake of explanation, the working position contact 41 is grounded, but the traveling position contact 40 may be easily grounded (not shown). is there.

[0017]

According to the present invention, when a self-propelled construction waste material crusher is used for crushing work, the material to be crushed contains a reinforcing bar or the like, and the machine suddenly malfunctions. Therefore, the emergency stop switch is turned on. However, when returning the emergency stop switch to the off state, it is necessary to keep all the plurality of operation switches for operating various actuators in the off state.
In the alarm device of the present invention, when the emergency stop alternate switch of the operation panel (single set or plural sets of operation panels) in which the work switches (including the work alternate switches) for operating the various actuators are arranged, The operation of all the various actuators is stopped, and the buzzer sounds and the alarm lamp is lit continuously. Before returning the emergency stop alternate switch to the off state, all the work switches are returned to the off state. However, if at least one work switch is on, the buzzer sounds. Continues. Therefore, the driver can recognize that the ON state remains in the work switches. Thus, when all the work switches are turned off, the buzzer is stopped and only the alarm lamp is lit. Then, the driver confirms the state and performs an operation of returning the emergency stop alternate switch to the off state. Therefore, in the self-propelled construction waste material crusher equipped with the alarm device of the present invention, safety and maintainability after using the emergency stop switch can be improved.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of an alarm device according to a first embodiment of the present invention.

FIG. 2 is a partially cutaway side view of a self-propelled construction waste crusher equipped with an alarm device according to a second embodiment of the present invention.

FIG. 3 is a rear view of a main part as viewed from A in FIG. 2;

FIG. 4 is an enlarged view of an upper operation panel in FIG. 3;

FIG. 5 is an enlarged view of a lower operation panel in FIG. 2;

FIG. 6 is a circuit diagram of an alarm device according to a second embodiment of the present invention.

FIG. 7 is a perspective view showing a self-propelled construction waste material crusher according to an embodiment of the prior art.

[Explanation of symbols]

1,45 Self-propelled construction waste material crusher 6,51 Feeder 7,52 Crusher 8,53 Conveyor 9,11 Operation panel 12 Running / work changeover switch 14, ..., 17 Work switch 18, ..., 21 Electromagnetic changeover valve 23 , ~, 26, 23 ', ~, 26', 28, 28 '
Lamp 27, 27 'Alternate switch for emergency stop 29, 29' Buzzer 30 Power supply 41 Work position contact 57, 57 ', 58, 58', 59, 59 ', 60, 6
0 'work alternate switch

Claims (2)

(57) [Claims] 1. A main body is connected to an upper part of a crawler traveling body, and a hopper for receiving construction waste such as concrete waste is provided on an upper part of the main body, and the construction waste supplied to the hopper is discharged from an outlet at a lower part of the hopper. It is sent to the crusher by a feeder to be crushed into predetermined fine particles, and the fine construction waste material is carried out by a conveyor arranged below the crusher, and the operation control of various actuators such as the feeder, crusher, and conveyor is performed. In the self-propelled construction waste material crusher, which is operated by operating a plurality of work switches disposed on the main body, a traveling position contact and a work position contact are provided in an electric circuit in which the work switch is disposed. A traveling / work switching switch capable of switching operation is provided, and a working position contact of the traveling / work switching switch is connected to the ground, Also, a self-holding emergency stop alternate switch having a plurality of switching contacts is connected to the power supply, and when the emergency stop alternate switch is in the off state, the power supply voltage is applied to each solenoid of the actuator control electromagnetic switching valve. And open the circuit connected to the buzzer connection circuit and the work position contact.A plurality of work switches are connected to the run / work changeover switch from each diode provided on the downstream side of each solenoid. It is interposed in each of the electric paths leading to the working position contacts,
In addition, the power supply and the upstream contact of each work switch are connected to each other via a lamp, and the downstream electric circuit of the buzzer is connected to each downstream electric circuit of the lamp via a diode, so that an emergency stop is performed. An alarm device for a self-propelled construction waste crusher, characterized in that a buzzer connection circuit is kept energized by turning on an alternate switch and at least one work switch. 2. A main body is connected to an upper part of the crawler traveling body, and a hopper for receiving construction waste such as concrete waste is provided on an upper part of the main body, and the construction waste supplied to the hopper is discharged from an outlet at a lower part of the hopper. It is sent to the crusher by a feeder to be crushed into predetermined fine particles, and the fine construction waste material is carried out by a conveyor arranged below the crusher, and the operation control of various actuators such as the feeder, crusher, and conveyor is performed. In the self-propelled construction waste crusher that is operated by operating a plurality of work switches connected to the main body, the upper operation panel is located at a high position above the main body, and a low position near the ground A lower operation panel is installed in the upper and lower operation panels, and one side contact and the other side contact are turned on by push-in / pull-out operations. Self-holding work alternate switches that can be switched on and off are arranged corresponding to various actuators, and each work alternate switch in the upper operation panel and each work alternate in the lower operation panel that operate the same actuator One side contact and one side contact of the switch are connected by wiring, and the other side contact and the other side contact are connected by wiring, and a traveling position contact is provided in one of the electric circuits of the upper operation panel and the lower operation panel. And a run / work switch that can be switched to the work position contact.
The work position contacts are connected to ground, and a self-holding emergency stop alternate switch having a plurality of switching contacts is provided on each of the upper and lower operation panels, and the actuator is operated when the emergency stop alternate switch is off. A power supply voltage is applied to each solenoid of the electromagnetic switching valve for control, a connection circuit of the buzzer and a circuit leading to the above-mentioned working position contact are opened, and various actuators are provided for the power supply side contact of the emergency stop alternate switch. One terminal of the solenoid of the electromagnetic switching valve for control is connected in parallel with each other, and the other terminal of each solenoid is connected to the work position contact via each diode and each work alternate switch. Turn off the lamp with the power supply voltage applied to the stop alternate switch. The downstream wiring of each lamp is grounded via each alternate switch corresponding to each lamp, and the downstream electric circuit of the buzzer is connected to each downstream electric circuit of the lamp via a diode. A self-propelled construction waste crusher characterized in that the emergency stop alternate switch and at least one set of work alternate switches are in an on-operation state so that the connection circuit of the buzzer is kept energized. Machine alarm device.