JP2000325823A - Electric circuit device for crawler crushing machine and crawler crushing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric circuit device for a crawler crushing machine which allows the miniaturization of a dashboard while sufficiently assuring crushing performance, and a crawler crushing machine using the same. SOLUTION: This electric circuit device has a battery 151 which is a supply source for power supply voltage 24 V, a controller 150c for controlling the driving action of a control valve device operating by the 24 V, a fuel gage sensor 153a and water temperature gage sensor 153b for detecting the state quantity relating to apparatus, such as an engine, jaw crusher, feeder, conveyor and magnetic separator, and a dashboard section 150a having a fuel gage 150aA and water temperature gage 150aB for displaying the detection results thereof. In such a case, the device is provided with a voltage conversion circuit 150cA for converting DC 24 V to DC 12 V and is operated at 12 V formed by its voltage conversion circuit 150cA.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-propelled crusher having a crushing device for crushing an object to be crushed, such as a jaw crusher, a roll crusher, a shredder, etc. More particularly, the present invention relates to a self-propelled crusher having sufficient crushing capability. The present invention relates to an electric circuit device of a self-propelled crusher capable of reducing the size of an instrument panel, and a self-propelled crusher using the same.

[0002]

2. Description of the Related Art Crushers transport various kinds of large and small rocks, construction waste materials, industrial wastes and the like generated at construction sites such as concrete lump taken out when dismantling buildings and asphalt lump discharged during road repair. By performing crushing to a predetermined size at the work site before the work, reuse of waste materials, smoothing of construction, cost reduction, and the like are achieved.

[0003] Of these crushers, for example, Japanese Patent Application Laid-Open
As described in Japanese Patent No. 6541, there is a self-propelled crusher capable of running on its own. This self-propelled crusher is composed of a traveling body equipped with left and right crawler tracks, a crusher provided on the traveling body, and a crusher for crushing a crushed object inputted from a hopper to a predetermined size, and a hopper. A crusher body equipped with a feeder that guides the input crushed material to the crushing device, a conveyor that transports the crushed material that has been crushed by the crushing device, and a crusher that is provided above the conveyor and is being transported on the conveyor. And a magnetic separator for magnetically attracting and removing a magnetic substance contained in the substance. At this time, the crawler track, the crushing device, the feeder, the conveyor, and the magnetic separator are respectively hydraulically driven actuators, that is, left and right traveling hydraulic motors, crushing hydraulic motors, feeder hydraulic motors, and conveyors. Operation by the hydraulic motor for magnetic separation and the hydraulic motor for magnetic separator.

[0004] Although not explicitly shown in the prior art, usually, in this type of self-propelled crusher, an operation panel provided in a driver's seat of a crusher main body includes, for example, a "crusher", a "feeder", and the like. A control valve device is provided with operation buttons for "", "conveyor" and "magnetic separator". When crushing work is performed, the operator presses each button to control hydraulic oil from a hydraulic pump driven by the engine. Is supplied to the crushing hydraulic motor, the feeder hydraulic motor, the conveyor hydraulic motor, and the magnetic separator hydraulic motor, respectively, to operate the crushing device, the feeder, the conveyor, and the magnetic separator. ing. At this time, for example,
A water temperature gauge sensor that detects the temperature of the radiator water for cooling the engine, a fuel gauge sensor that detects the fuel amount of the engine, and the like are input with a detection signal and an instrument panel that displays the detection result is provided in the driver's seat. It is often provided in conjunction with the operation panel. The instrument panel may be provided with a switch for a work light used at the time of work or the like, a switch for a horn for calling attention to the surroundings, and the like.

[0005]

In recent years, self-propelled crushers have been actively introduced even in smaller construction sites than in the past under the background of the promotion of waste recycling such as the enforcement of the so-called Recycling Law. At the same time, there is a growing movement to crush rock, construction waste, industrial waste, etc. at the site, and in response to this, there is a need for a self-propelled crusher smaller than before, for example, with a total weight of about 10 tons. Is growing.

In order to reduce the size of the crusher body in order to meet such needs, the size of the above-mentioned devices of the crusher body and the above-mentioned hydraulic motor are reduced, and furthermore, the power unit and the driver's seat space for housing the above-mentioned engine and hydraulic pump are provided. It is necessary to reduce the size of the image. However, since it is desired to secure the crushing ability as much as possible, it is necessary to equip the driving system such as each device, the hydraulic motor, and the power unit with a certain large one. From the above viewpoints, a drastic reduction in the driver's seat space is desired, and a reduction in the size of the instrument panel arranged in the driver's seat is also desired.

Here, in general, most of the hydraulic machines, including the self-propelled crusher, are electronically controlled by a controller, most of the components constituting the drive system, the hydraulic motor, the hydraulic pump, and the like. The power supply voltage and control voltage used at times are determined according to the size of the hydraulic machine, and electronic devices such as the controller and the instrument panel usually have specifications such that they operate at the determined common voltage. Selected.

However, as described above, when it is desired to reduce the size of the instrument panel while using a somewhat large driving system, a relatively high voltage is required for a controller for controlling the large driving system. When an instrument panel having the same voltage specification is used, the structure of the instrument panel itself tends to be large, and sufficient miniaturization cannot be achieved.

[0009] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to secure a sufficient crushing ability and
An object of the present invention is to provide an electric circuit device of a self-propelled crusher capable of reducing the size of an instrument panel and a self-propelled crusher using the same.

[0010]

(1) In order to achieve the above object, the present invention provides a plurality of devices including a crushing device for crushing an object to be crushed received by a hopper, and a crushing device for driving the crushing device. A plurality of hydraulic actuators each including a hydraulic motor for driving the plurality of devices, a hydraulic pump for discharging pressurized oil to the plurality of hydraulic actuators, a prime mover driving the hydraulic pump, and the plurality of hydraulic pumps from the hydraulic pump. A battery which is provided in a self-propelled crusher having a power unit incorporating a control valve device for controlling the direction and flow rate of pressure oil supplied to the hydraulic actuator, and which is a first power supply voltage supply source; Operating at a power supply voltage of the controller and controlling a driving operation of the control valve device, and detecting a state quantity related to the motor and the plurality of devices. An electric circuit device for a self-propelled crusher having a step and an instrument panel provided with a display means for displaying a detection result of the detection means, wherein the first power supply voltage is set to a value higher than the first power supply voltage. Voltage converting means for converting the voltage to a second power supply voltage which is lower than the power supply voltage, and operating the instrument panel with the second power supply voltage generated by the voltage converting means.

Although the size of the electronic device is determined by the power supply voltage and control voltage used at that time, in the present invention, a relatively high first power supply supplied from a battery is used as a power supply for operating the instrument panel. By using the relatively low second power supply voltage obtained by converting the voltage by the voltage conversion means, the magnitude can be made relatively small. At this time, on the other hand, a relatively high first power supply voltage supplied from a battery is used as a power supply for operating the controller, and the driving operation of the control valve device is controlled so that a plurality of crushing devices and the like constituting a driving system are provided. Can be relatively large. Thereby, sufficient crushing ability can be secured.

As described above, it is possible to reduce the size of the instrument panel while sufficiently securing the crushing ability.

(2) In the above (1), preferably,
The voltage conversion means is built in the controller.

[0014] This saves more space than the case where a separate voltage conversion means is provided outside the controller. For example, when the controller and the instrument panel are housed in one control panel, the control can be performed. The size of the panel can be reduced.

(3) In the above (1), preferably, the first power supply voltage is approximately 24V, and the second power supply voltage is approximately 12V.

(4) In the above (1), preferably, the detection means is a sensor whose one end is grounded and which detects the state quantity by using a change in a resistance value according to the change in the state quantity. The other end of the sensor is connected to the instrument panel so that the detected state quantity can be directly output.

(5) In the above (4), more preferably, the sensor is at least one of a fuel sensor for detecting a fuel amount of the prime mover and a water temperature sensor for detecting a temperature of cooling water of the prime mover. Including one.

(6) In the above (1), and preferably, an electric load which operates at the first power supply voltage in connection with an attachment mechanism related to an application other than crushing, and the second power supply from the instrument panel A relay that opens and closes a circuit that introduces the first power supply voltage from the battery to the electric load in response to a voltage signal.

As described in the above (1), when the instrument panel is driven by the second power supply voltage in order to reduce the size of the instrument panel, from the viewpoint of cost, etc. It is desirable to divert the structure as it is.
The sensor described in the above (4) detects the state quantity by using the change in the resistance value, and thus can be used as it is regardless of the operating voltage. However, an electric load related to an attached mechanism such as a horn or a headlight cannot operate unless a predetermined operating voltage (that is, a first power supply voltage), and the instrument panel operates at the second power supply voltage as described above. Therefore, the electric load cannot be driven and controlled by the instrument panel as it is.

Therefore, in the present invention, a relay is provided in a circuit for introducing the first power supply voltage from the battery to the electric load, and this relay is opened and closed according to the second power supply voltage from the instrument panel. Thus, the power supply of the first power supply voltage to the electric load can be conducted / cut off by the instrument panel, and thus the electric load can be drive-controlled.

(7) In the above (6), more preferably, the instrument panel includes a relay control circuit for controlling a ground side of the coil of the relay, and the other end of the coil of the relay is connected to the battery. And the ground side of the coil of the relay is connected to the relay control circuit.

A control circuit for controlling the ground side of the coil of the relay, for example, an open collector type circuit using a transistor is provided on the instrument panel, and this control circuit is connected to the other end of the coil of the relay. When a signal for operating the relay control circuit is input by turning on the switch of the instrument panel, the relay control circuit functions in the same manner as the switch, and the current of the first power supply voltage from the battery is introduced into the coil, and the other end of the coil Can be introduced into the relay control circuit from the side. When the current flows in this way, the coil of the relay is excited and the relay is turned on. Thus, the first power supply voltage from the battery can be introduced to the electric load, and the electric load can be operated. That is, it is possible to realize a configuration in which the instrument panel that operates with the second power supply voltage drives and controls the electric load that operates with the first power supply voltage.

At this time, in general, from the viewpoint of preventing occurrence of short circuit due to erroneous wiring or the like at the time of maintenance during maintenance, even if wiring of a plurality of voltages is mixed in the wiring controlled by the controller, there is not much problem. Although it does not occur, it is preferable to avoid mixing power supply lines with a plurality of voltages as much as possible.

Here, for example, a relay provided with a switch of the first power supply voltage specification and a coil of the second power supply voltage specification for opening and closing the switch is provided outside the instrument panel, and the instrument panel section of the second power supply voltage specification is provided. When an electric signal of the second power supply voltage is output to the coil to open and close the switch, a circuit outside the instrument panel and conducting the second power supply voltage is provided between the voltage conversion means and the instrument panel. A circuit and a circuit from the instrument panel to the coil. Therefore, at the time of maintenance, a worker must pay close attention to prevent short circuit caused by erroneous wiring being confused with the wiring in which the first power supply voltage is conducted. Burden is great and workability is reduced.

On the other hand, in the present invention, the first power supply voltage is introduced into the coil of the relay as described above, and is further introduced into the relay control circuit from the other end of the coil. Since the circuit connecting the instrument panel and the coil of the relay conducts the first power supply voltage,
The circuit in which the second power supply voltage is conducted outside the instrument panel is only the circuit from the voltage conversion means to the instrument panel. Thereby, the labor and time burden of the worker during maintenance can be reduced, and workability can be improved.

(8) In the above (7), more preferably, the relay control circuit is an open collector type circuit having a transistor whose emitter side is grounded, and the ground side of the coil of the relay is connected to the ground of the transistor. Connected to collector side.

Thus, for example, the switch on the instrument panel is set to O
N, when a signal for activating the open collector circuit is input to the base of the transistor, the transistor performs the same function as a switch, and the current of the first power supply voltage from the battery is introduced into the coil of the relay, Introduced from the other end of the coil to the collector of the transistor,
Grounded from the emitter side of the transistor. By controlling the ground side of the relay in this way, a current can flow through the relay, and the coil of the relay can be excited to drive the relay.

(9) In the above (6), preferably, the electric load is at least one of an electric load for a work light used in a crushing operation and an electric load for a horn for calling attention to the surroundings. Including one.

(10) In the above (1), preferably, a first fuse is provided in a circuit for supplying the first power supply voltage from the battery to the controller, and the voltage conversion means is connected to the instrument panel. A circuit for supplying the second power supply voltage is provided with a second fuse that operates independently of the first fuse.

(11) A plurality of devices including a crushing device for crushing the object to be crushed received by the hopper, and a plurality of hydraulic actuators including a crushing hydraulic motor for driving the crushing device and respectively driving the plurality of devices. A hydraulic pump for discharging hydraulic oil to the plurality of hydraulic actuators, a prime mover for driving the hydraulic pump, and a control valve device for controlling the direction and flow rate of hydraulic oil supplied from the hydraulic pump to the hydraulic actuators , A battery that is a supply source of a first power supply voltage, a controller that operates on the first power supply voltage and controls a driving operation of the control valve device, the motor and the plurality of motors. A self-propelled breaker having detecting means for detecting a state quantity related to an apparatus, and an instrument panel having a display means for displaying a detection result of the detecting means. A voltage conversion means for converting the first power supply voltage into a second power supply voltage relatively lower than the first power supply voltage, and generating the instrument panel by the voltage conversion means. It is operated with the second power supply voltage.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a self-propelled crusher will be described below with reference to the drawings. FIG. 1 is a side view showing the entire structure of a self-propelled crusher to which one embodiment of the present invention is applied, and FIG. 2 is a top view of the self-propelled crusher shown in FIG. FIG. 3 is a sectional view taken along the line III-III in FIG.
It is sectional drawing seen in section.

In FIG. 1 to FIG. 3, the self-propelled crusher 1 responds to the need for miniaturization based on the background of the recent promotion of waste recycling, and has a total weight of about 10 tons, for example. It can be loaded and transported on a 10-ton load truck (preferably a single truck type truck other than a trailer) to improve transportability.

The self-propelled crusher 1 is provided with a hopper 2 into which a crushed object is thrown by a working tool such as a bucket of a hydraulic shovel and receives the crushed object, and a hopper 2 having a substantially V-shaped side cross-sectional shape. A crusher body 7 having a crusher for crushing the received crushed material to a predetermined size, for example, a jaw crusher 3, and a feeder 4 for conveying and guiding the crushed material received in the hopper 2 to the jaw crusher 3; A conveyor 5 for transporting the crushed material crushed by the jaw crusher 3 and becoming smaller to the rear side of the crusher 1 (the right side in FIGS. 1 and 2) and carrying out the conveyor 5, and is provided above the conveyor 5 and is being transported on the conveyor 5. A magnetic separator 6 for magnetically attracting and removing a magnetic substance contained in the crushed material; a left and right crawler track 8a and a track frame 9 provided below the crusher main body 7;
And a traveling body 8 provided with

The hopper 2 and the feeder 4 are mounted above the front end (left side in FIGS. 1 and 2) of the track frame 9 in the longitudinal direction.

The jaw crusher 3 is located on the rear side (the right side in FIGS. 1 and 2) of the hopper 2 and the feeder 4, and as shown in FIGS.
Is mounted on an intermediate portion in the longitudinal direction (the horizontal direction in FIGS. 1 and 2). At this time, the driving force generated by the crusher hydraulic motor 10 is applied to the flywheel 1 via the belt 11.
2 and the driving force transmitted to the flywheel 12 is converted into the oscillating motion of the moving teeth 3a (see FIG. 2) by a known conversion mechanism, and the moving teeth 3a are moved relative to the fixed teeth 3b (the same). The object to be crushed supplied from the feeder 4 is crushed to a predetermined size by swinging back and forth. The upper and side portions of the jaw crusher 3 are covered with a housing 13, and an openable / closable cover 14 is provided on an upper portion of the housing 13, and by opening the cover 14, the upper portion is opened as shown in FIG. Directly above and on the side
The inside of the jaw crusher 3 can be visually recognized from the upper side (including the front and rear side).

As shown in FIGS. 1 and 2, the feeder 4 is provided with a support 16 at the front (left side in FIGS. 1 and 2) end of the track frame 9 in the longitudinal direction (left and right directions in FIGS. 1 and 2).
The hopper 2 is mounted on a feeder frame 16 provided through a. The feeder 4 is a so-called grizzly feeder, and a plurality of (two in this example) saw teeth on which the crushed material from the hopper 2 is placed by the driving force generated by the feeder hydraulic motor 15. The bottom plate including the plate 4a is vibrated. In this way, the crushed objects put into the hopper 2 are sequentially conveyed and supplied to the jaw crusher 3 (= conveyance function), and fine earth and sand attached to the crushed objects during the conveyance are removed from the gaps between the saw teeth of the serrated plate 4a. It is designed to fall down. That is, the sieve-like plate 4a also has a sorting function of sorting out crushed objects having a particle size smaller than the size of the gap by sifting the crushed objects having a smaller particle size than the size of the gap between the saw teeth. .

The conveyor 5 includes a conveyor hydraulic motor 17.
This drives the belt 5a, thereby transporting the crushed material that has fallen from the jaw crusher 3 onto the belt 5a.

The magnetic separator 6 is attached to the power unit 32 via a support member 6b. The magnetic separator 6 has a magnetic separator belt 6a disposed above the conveyor belt 5a so as to be substantially orthogonal to the conveyor belt 5a. By driving the magnetic force from the magnetic force generating means (not shown) around the belt 6a by driving the magnetic force from the magnetic force generating means (not shown) by the hydraulic motor 18 for magnetic separator, the magnetic material is attracted to the belt 6a, and then the conveyor belt is driven. The conveyor belt 5a is transported in a direction substantially perpendicular to the conveyor belt 5a and dropped to the side of the conveyor belt 5a.

Each of the crawler tracks 8a is bridged between a driving wheel 19 provided on the traveling body 8 and an idler 20, and a left and right traveling hydraulic motors 21 (see FIG. (Not shown) to drive the crusher 1.

The track frame 9 is provided with a crusher mounting portion 9A formed by a substantially rectangular frame and a leg provided below the crusher mounting portion 9A and provided with the endless track crawler 8a at the lower left and lower right. 9B. A power unit frame 32a, which is a basic lower structure of the power unit 32, is mounted on an upper portion of a rear end (right side in FIGS. 1 and 2) of the track frame crusher mounting portion 9A in the longitudinal direction (see FIG. 1). ).

The power unit 32 is used to control the pressure applied to hydraulic actuators such as the hydraulic motor 10 for crusher, the hydraulic motor 15 for the feeder, the hydraulic motor 17 for the conveyor, the hydraulic motor 18 for the magnetic separator, and the left and right traveling hydraulic motors 21. At least one hydraulic pump (not shown) for discharging oil, an engine (the same as a prime mover) for driving the hydraulic pump, and the direction and flow rate of the hydraulic oil supplied from the hydraulic pump to the hydraulic actuator. A control valve device (same as above) having a plurality of control valves (same as above) for controlling, a fuel tank 34 of the engine having an oil supply port 34a, and a hydraulic oil tank 35 having an oil supply port 35a are built in. .

In the power unit 32, when the engine below the engine cover 36 is started, the hydraulic pump is driven as described above. On the other hand, the driving force rotates a fan (not shown) provided on the upstream side of the cooling air (described later) of the engine, and external air is introduced from the intake hole 37 into the internal space of the power unit 32. After cooling the radiator (the cooling water inspection port 38 is shown in FIG. 2), it flows into the fan. Further, the cooling air blown out from the fan cools an engine, a muffler (not shown), a hydraulic pump, and the like, and is then discharged to the atmosphere from an exhaust hole 39. At this time, the exhaust gas from the engine flows into the muffler from an exhaust manifold (not shown) of the engine, is muffled, and is discharged into the atmosphere from an exhaust gas pipe 40 connected to the muffler. Reference numeral 41 denotes an intake port of an air cleaner for purifying intake air to the engine.

The front side of the power unit 32 (FIG. 2)
A driver's seat 42 on which an operator rides is provided on the left side (middle left). When the operator stands in the driver's seat 42 (see FIG. 1), the state of supply of the crushed material by the feeder 4 during the crushing operation. And the state of crushing by the jaw crusher 3 can be monitored. In addition, the driver's seat 4 is attached to the truck frame crusher mounting portion 9A.
Auxiliary step 9Aa to be a foothold for getting on and off
Is attached.

Here, the jaw crusher 3, the feeder 4, the conveyor 5, the magnetic separator 6, and the track crawler 8a
Is driven by a known hydraulic drive device including the crusher hydraulic motor 10, the feeder hydraulic motor 15, the conveyor hydraulic motor 17, the magnetic separator hydraulic motor 18, and the traveling hydraulic motor 21.

That is, for example, when the self-propelled crusher 1 is self-propelled, the pressure oil from the hydraulic pump is supplied to the driver's seat 4.
2 is supplied to the traveling hydraulic motor 21 via a traveling control valve (not shown) in the control valve device which is switched in accordance with the operation of the operation levers 52 and 53, thereby driving the endless track crawler 8a and traveling. The body 8 runs.

During the crushing operation, for example, the driver's seat 42
By sequentially pressing a feeder start switch (same), a crusher start switch (same), and a conveyor / magnetic separator start switch (same) of an operation panel (not shown) provided in the controller 150c, the operation signal is sent to the controller 150c (described later). FIG. 4 (b)
), And output as a drive signal from the controller 150c to switch the feeder control valve (same as above), the crushing control valve (same as above), and the conveyor / magnetic separator machine control valve (same as above). Hydraulic oil from the hydraulic pump of the corresponding hydraulic motor 15,
The feeder 4, the jaw crusher 3, the conveyor 5, and the magnetic separator 6 are driven.

When a crushed object is thrown into the hopper 2 by, for example, a bucket of a hydraulic shovel, the thrown crushed object is guided to the jaw crusher 3 while only those having a predetermined particle size or more are sorted out in the feeder 4. Crushed into a predetermined size by the jaw crusher 3. The crushed material is transferred from the space below the jaw crusher 3 to the conveyor 5.
The magnetic material (for example, rebar pieces mixed in the waste of concrete construction) mixed in the crushed material is removed by the magnetic separator 6 in the middle of the transportation, and the size is almost uniform. Finally, the crusher 1 is carried out from the rear (the right end in FIG. 1).

At this time, various devices such as the feeder 4, the jaw crusher 3, the conveyor 5, and the magnetic separator 6, and the state quantities (specific examples will be described later) related to the engine are detected by various sensors. The result of the detection is
Is displayed on the control panel 150 (see FIG. 2) disposed on the right side as viewed from the operator inside. FIGS. 4A and 4B are a top view and a side view showing a detailed structure of the control panel 150. FIG.

4 (a) and 4 (b), the control panel 150 includes an instrument panel section 150a mainly for displaying the above-described detection results and the like. Turn on the power of various devices
N (to be described later), the key switch 150b, the controller 150c, and the fuses 150dA to 150dD.
(To be described later).

In this example, the instrument panel 150a includes a fuel gauge 150aA for displaying the amount of fuel in the fuel tank as the liquid crystal display means for performing the display, and a cooling water for the radiator (that is, the engine water). A water temperature gauge 150aB for displaying the temperature of the cooling water and an hour meter 150aC for displaying the total machine operating time are provided. In addition,
The instrument panel 150a is also provided with a switch for operating an accessory (attachment mechanism) related to an application other than crushing. In this example, a work light for operating a work light used during crushing work is provided. A switch 150aD and a horn switch 150aE for operating a horn (horn) that calls attention to the surroundings are provided. In addition, 150aD1 is a work light switch indicator, and the work light switch 15
It is lit only when 0aD is pressed.

The electric circuit device according to the present embodiment includes the control panel 150, and its electric circuit diagram is shown in FIG.
Shown in

In FIG. 5, the electric circuit device according to the present embodiment has a relatively high first power supply voltage, for example, DC 2
A battery 151 which is a supply source of 4V (actually fluctuates by about 23V to 28V), a battery relay 152 connected to the battery 151, an instrument panel 150a provided in the control panel 150, and a key switch 150b , A controller 150c, and a fuse box 150d.

In this electric circuit device, a fuel gauge sensor 153a for detecting the fuel amount is used as detecting means for detecting a state quantity relating to each of the devices and the engine.
And a water temperature sensor 153b for detecting the temperature of the radiator cooling water.

Further, in this electric circuit device, as an electric load related to the accessory, in this example, an electric load (bulb) 154a for a work light for operating the work light,
The horn electrical load 154b is provided. Corresponding to these, a work light relay 155a for supplying power to the work light electric load 154a and a horn relay 155b for supplying power to the horn electric load 154b are provided. These work light electric loads 154a,
Each of the horn electric load 154b, the work light relay 155a, and the horn relay 155b has a specification corresponding to DC 24V (rated 24V specification).

The instrument panel 150a is connected to a DC 12V
(A rated 12V specification), the fuel meter 150aA, the water temperature meter 150aB, and the hour meter 1
50aC, a work light switch 150aD, and a horn switch 150aE, a CPU (central processing unit) 150aF having a calculation function, and the work light relay 155
a and a horn relay 155b, respectively, and relay driving circuits 150aG and 150aH, and a power supply circuit 150aI to which a first power supply voltage is input.

At this time, the fuel gauge sensor 153a and the water temperature gauge sensor 153b have one end (corresponding to the right side in FIG. 5).
Is a sensor that is grounded and detects the fuel amount and the water temperature using a change in the resistance value according to the change in the fuel amount and the water temperature,
The other end (corresponding to the left side in FIG. 5) is a circuit 15
CPU of instrument panel section 150a directly via 8a, 158b
The outputs from the fuel gauge sensor 153a and the water temperature gauge sensor 153b (that is, the detected state quantities) are directly input to the CPU 150aF.

Also, the relay drive circuits 150aG, 150
aH is an open collector type including a transistor whose emitter side is grounded. Further, the work light relay 155a and the horn relay 155b are respectively provided with switch units 155aA and 155bA for opening and closing a circuit for introducing a power supply voltage from the battery 151 to the work light electric load 154a and the horn electric load 154b. Drive units 155aB and 155bB having coils for driving and opening the units 155aA and 155aB. The power supply side (that is, the other end side or the anti-earth side) of the coils of these drive units 155aB and 155bB is connected to the fuse box 150d via the circuits 156a and 156b.
Are connected to the fuses 150dA and 150dB, respectively, and the ground side of the coils of the drive units 155aB and 155bB is connected to the collector sides of the transistors of the relay drive circuits 150aG and 150aH via circuits 157a and 157b.

The battery relay 152 is connected to the switch 15
2a and a drive unit 152b having a coil for driving and opening the switch unit 152a.
The power supply side of 52a (that is, the anti-earth side) is the circuit 15
8 is connected to the battery 151, while the ground side is connected to the fuse 150dA in the fuse box 150d via the circuit 164.

Next, the operation of this embodiment will be described below.

When the operator turns on the key switch 150b, the voltage of 24 V from the battery 151
8, a circuit 159, a key switch accessory (ACC) terminal, a circuit 160, a fuse 150dB in a fuse box 150d, and a controller 150 via a circuit 161.
c. At this time, in the controller 150c, the power supply voltage 24V from the battery 151 is changed to a second power supply voltage relatively lower than the first power supply voltage, for example, DC 12V (actually, fluctuates by about 11V to 13V).
A known voltage conversion circuit 150cA is provided, which receives the power supply voltage 24V from the circuit 161 from an input terminal and outputs a voltage of 12V from an output terminal. The voltage of 12 V is supplied to the power supply circuit 1 in the instrument panel 150a via the circuit 162, the fuse 150dD in the fuse box 150d, and the circuit 163.
It is introduced to 50aI, and further guided to CPU 150aF.

The CPU 150aF inputs signals corresponding to changes in the resistance values of the fuel gauge sensor 153a and the water temperature gauge sensor 153b via the circuits 158a and 158b, and sends signals corresponding thereto to the fuel gauges 150aA and 150aB. Output. As a result, the fuel amount and the radiator water temperature at that time are displayed on the fuel gauge 150aA and the water temperature gauge 150aB of the instrument panel 150a in a liquid crystal display.

At this time, the key switch 150b
ON operation of the key switch M terminal to the circuit 165
24V power is also supplied to the battery relay driving unit 15
2b. As a result, the switch 152a is turned on, and the circuit 164, the fuse 150dA, and the circuit 156 are turned on.
The battery 151 and one end of the work light relay 155a are connected via a.

Here, the operator operates the work light switch 150a.
When D is pressed, the corresponding ON signal is output to the CPU 150a.
F is input to the base side of the transistor of the relay drive circuit 150aG. At this time, as described above, since the emitter side of this transistor is grounded and the collector side is connected to the working light relay drive section 155aB via the circuit 157a, the 24V
The power source is the circuit 158, the battery relay switch unit 152
a, circuit 164, fuse 150dA, circuit 156a,
The work lamp relay drive section 155aB, the circuit 157a, and the relay drive circuit 150aG flow on a path on the collector side of the transistor and on the emitter side of the transistor. This excites the coil of the work light relay drive unit 155aB, so that the switch unit 155aA conducts and the circuit 156
The 24V power supply from a is supplied to the work light electric load 154a, and the work light is turned on.

When the operator presses the horn switch 150aE, a corresponding ON signal is input from the CPU 150aF to the base side of the transistor of the relay drive circuit 150aH, and the 24V power from the battery 151 is supplied according to the same principle as described above. , Circuit 158, circuit 159, key switch ACC terminal, circuit 160, fuse 150dC, circuit 156b, horn relay driver 155bB, circuit 15
7b, the current flows through the path on the collector side of the transistor of the relay drive circuit 150aH and on the emitter side of this transistor. As a result, the coil of the horn relay drive section 155bB is excited, the switch section 155bA is turned on, and the 24V power supply from the circuit 156b is supplied to the horn electric load 15b.
4b and the horn sounds. The transistor of the relay drive circuit 150aH has a sufficient withstand voltage with respect to a 24V power supply.

In the above, the jaw crusher 3, the feeder 4, the conveyor 5, and the magnetic separator 6 constitute a plurality of devices. Further, the crushing hydraulic motor 10, the feeder hydraulic motor 15, the conveyor hydraulic motor 17, and the magnetic separator hydraulic motor 18 constitute a hydraulic actuator that drives a plurality of devices. Further, the control valve device constitutes a control valve device for controlling a direction and a flow rate of the pressure oil supplied from the hydraulic pump to the plurality of hydraulic actuators.

The instrument panel 150a of the control panel 150
Constitutes an instrument panel provided with a display means for displaying the detection result of the detection means, and the voltage conversion circuit 150cA converts the first power supply voltage to a second power supply relatively lower than the first power supply voltage. A voltage converting means for converting the voltage into voltage is constituted.

Further, the fuel gauge sensor 153a constitutes a fuel sensor for detecting the amount of fuel of the prime mover.
53b constitutes a water temperature sensor for detecting the temperature of the cooling water of the prime mover, and the work light electric load 154a and the horn electric load 154b operate at the first power supply voltage in relation to an accessory mechanism related to an application other than crushing. Configure the electrical load to
The work light relay 155a and the horn relay 155b constitute a relay that opens and closes a circuit that introduces the first power supply voltage from the battery to the electric load. The relay drive circuits 150aG and 150aH constitute a relay control circuit that controls the ground side of the coil of the relay. Further, the fuse 150 dB in the fuse box 150 d constitutes a first fuse provided in a circuit for supplying a first power supply voltage from the battery to the controller, and the fuse 15
0dD constitutes a second fuse which operates independently and independently of the first fuse in a circuit for supplying the second power supply voltage from the voltage conversion means to the instrument panel.

According to the electric circuit device of the present embodiment configured as described above, the following effects can be obtained.

(1) Miniaturization of Instrument Panel and Control Panel In general, the size of electronic equipment is determined by the power supply voltage and control voltage used at that time. In the present embodiment, a relatively low second power obtained by converting a relatively high first power supply voltage (24V) supplied from battery 151 by voltage conversion circuit 150cA is used as a power supply voltage for operating instrument panel 150a. Power supply voltage (12 V). Thus, the size of the instrument panel 150a can be made relatively small.

At this time, on the other hand, as the power supply voltage for operating the controller 150c, 24V supplied from the battery 151 is used as it is, thereby controlling the driving operation of the control valve device. As a result, the jaw crusher 3, the feeder 4, the conveyor 5, and the magnetic separator 6 constituting the drive system
Etc. can be made relatively large, so that sufficient crushing capacity as a crusher can be secured.

As described above, it is possible to reduce the size of the instrument panel 150a while sufficiently securing the crushing ability. Therefore, the size of the control panel 150 can be reduced, and the space for the driver's seat 42 can be saved.

(2) Cost Reduction Effect by Controlling 24V-Specified Electric Load with 12V-Specified Instrument Panel The cost reduction effect will be described with reference to FIGS. 6 (a) to 6 (c). These figures are diagrams for explaining the principle of the present invention.

As described above, in recent years, for example, a total weight of 10
Although the need for a self-propelled crusher smaller than the conventional one is increasing, the power supply voltage for operating the instrument panel is relatively large (or medium). A relatively high power supply voltage (for example, 24 V) is supplied from a battery and used, and the power supply voltage and the control voltage in the electric circuit device are almost unified.

Here, as described in the above (1), in order to reduce the size of the instrument panel 150a,
In the case of driving at 2 V, it is desirable to use the conventional structure as it is for parts other than the instrument panel 150a, from the viewpoint of cost and the like.

Here, the above sensors (fuel gauge sensor 153a, water temperature gauge sensor 153) connected to the instrument panel 150a
b) and the electric load relating to the attached mechanism (electric light 1 for work light)
Since the sensors 153a, 153b, etc., of the electrical load 54a and the horn electrical load 154b) detect the corresponding state quantities by using the change in the resistance value, they can be diverted as they are regardless of the operating voltage. Therefore, the instrument panel 150
Even if a is a 12V specification, the sensors 153a, 153b
It is possible to connect

However, the electric load 154 related to the attachment mechanism
a and 154b cannot operate unless a predetermined operating voltage (24 V in this case) corresponding to the specification is applied. Therefore, in this state, the battery 151 to the electric load 154a, 15
The 4V 24V system cannot be connected to the 12V specification instrument panel 150a (see FIG. 6A).

Therefore, a voltage conversion circuit (corresponding to 150 cA in the above embodiment) for converting 24 V to 12 V is separately provided, and power is supplied to the instrument panel 150 a from this voltage conversion circuit, while the electric load 154 a , 154b
If the power is supplied directly from the battery 151, the power supply voltage corresponding to both the electric loads 154a and 154b and the instrument panel 150a can be supplied (FIG. 6B).
reference). However, since the instrument panel 150a operates at 12V, the instrument panel 150a operates at 24V.
The drive control of the electric loads 154a and 154b of the specification cannot be performed as it is, and some contrivance is required for the drive control.

Therefore, in the present embodiment, FIG.
As shown in (c), a work light relay 155a and a horn relay 155b are provided in power supply circuits 156a and 156b to the electric loads 154a and 154b, respectively, and an open collector type relay drive using a transistor is provided in the instrument panel 150a. Circuits 150aG and 150aH are provided, the emitter side of the transistor is grounded, and the collector side is connected to the ground side (opposite power supply side) of the relays 155a and 155b. The transistors of the relay drive circuits 150aG and 150aH perform the same function as the switches as described above, so that the relay 155 is turned on.
a, 155b are energized to drive the relays 155a, 155b.
155b can be turned on, and the electric loads 154a and 154b can be operated.

That is, the instrument panel 150a operating at a power supply voltage of 12V can drive and control the electric loads 154a and 154b operating at a power supply voltage of 24V. As a result, as for the electric loads 154a and 154b and the peripheral wirings, the conventional 24V specification can be used as it is, so that the cost can be reduced.

(3) Workability Improvement Effect During Maintenance As described in (2) above, in the present embodiment, the relay drive circuits 150aG, 1
By providing 50aH and making the transistor perform the same function as the switch, the electric loads 154a, 154b
Was activated. However, the instrument panel 1 of the 12V specification
Electric loads 154a, 154 of 24V specification by 50a
If only the purpose of controlling the driving of the electric loads b is achieved, as shown in FIG.
As relays located in the power supply circuits 156a and 156b to the power supply 4b, an external relay 166 including a switch unit having a 24V specification and a driving unit having a coil having a 12V specification is provided outside the instrument panel unit 150a to provide a 12V specification. Instrument panel 15
It is only necessary to output a 12V electric signal from 0a via the circuit 167 to the coil to open and close the switch. This configuration is also within the scope of the present invention as long as the effects (1) and (2) are obtained. is there.

However, in the structure shown in FIG. 6D, there are the following items that can be further improved. That is, in general, at the time of maintenance, from the viewpoint of preventing occurrence of short circuit due to erroneous wiring or the like at the time of work, although wiring controlled by the controller is not so problematic even if a plurality of voltages are mixed, As for the power supply line via the fuse, it is preferable to avoid mixing a plurality of voltage lines as much as possible.

Here, in the structure of FIG. 6D, the electric wiring through which a 12V current is led outside the instrument panel 150a is a circuit 162 from the voltage conversion circuit 150cA to the fuse 150dD, and the fuse 150dD to the instrument panel 150a And the circuit 167 from the instrument panel 150a to the external relay 166. Therefore, at the time of maintenance, a worker must pay close attention to prevent short circuit caused by erroneous wiring confused with 24V wiring, and the labor and time burden are large, and the workability is high. Decrease.

On the other hand, in the embodiment shown in FIG. 6 (c), the electric wiring through which a 12V current is led outside the instrument panel 150a is composed of the circuit 162 from the voltage conversion circuit 150cA to the fuse 150dD, the fuse 150d
Only two circuits 163 from D to the instrument panel 150a are required. Therefore, the labor and time burden of the worker at the time of maintenance can be reduced by that much, and the workability can be improved.

(4) Others In the above-described embodiment of the present invention, by providing the voltage conversion circuit 150cA inside the controller 150c, the control panel 150 can be made smaller than when a separate voltage conversion means is provided outside the controller. Therefore, the space for the driver's seat 42 can be further reduced.

The present invention is not limited to a small self-propelled crusher as in the above-described embodiment, but is applicable to a so-called medium-sized or large self-propelled crusher. Is also good.

In the embodiment of the present invention, the case where 24V is used as the relatively high first power supply voltage and 12V is used as the relatively low second power supply voltage has been described as an example. However, the present invention is not limited to this. In short, it is sufficient that the first power supply voltage is higher than the second power supply voltage in terms of the rated voltage. Needless to say, it belongs to the category.

In one embodiment of the present invention, as a detecting means for detecting a state quantity relating to the engine and a plurality of devices and a display means for displaying the same, a fuel gauge for detecting a fuel amount in a fuel tank is provided. Although the sensor 153a and the fuel gauge 150aA for displaying the sensor 153a and the water temperature sensor 153b for detecting the temperature of the cooling water of the radiator and the water thermometer 150aB for displaying the same have been described as examples, the invention is not limited thereto. That is, for example, a sensor that detects the oil pressure of the engine oil, the voltage at a predetermined location in the electric circuit device, the filter pressure of the air cleaner (see the intake port 41 in FIG. 2) that cleans the intake air of the engine, and the like. Means for displaying the detection result may be provided.

Further, in the above-described embodiment of the present invention, the work load electric load 154a and the switch for operating the electric light are used as an electric load related to an accessory (attached mechanism) related to an application other than crushing and a switch for operating the accessory. Although the working light switch 150aD, the horn electric load 154b, and the 150aE for operating the horn electric load 154b have been described as an example, the invention is not limited thereto.

Further, in the above-described embodiment of the present invention, the case where the switching circuit is formed by using an open collector type transistor as the relay control circuit has been described as an example. However, the present invention is not limited to this.
A switching circuit may be formed using T or the like. In these cases, a similar effect is obtained.

Further, in one embodiment of the present invention, the voltage conversion means is provided in the controller 150c as the voltage conversion circuit 150cA.
As long as the effects of (1) to (3) are obtained, the controller 1 need not necessarily be provided in the controller 150c.
Needless to say, it may be provided outside 50c.

Further, in the embodiment of the present invention, a case has been described as an example where the present invention is applied to a self-propelled crusher having an engine as a prime mover. However, the present invention is not limited to this.
For example, the present invention may be applied to a self-propelled crusher having an electric motor or the like as a motor.

Further, in the embodiment of the present invention, the self-propelled crusher 1 having the jaw crusher 3 for crushing the moving teeth 3a and the fixed teeth 3b as the crushing device has been described as an example. The present invention is not limited to this. Other crushing devices, for example, a pair of rotators having a crushing blade attached to a roll-shaped rotating body are rotated in opposite directions to each other, and the crushed object is sandwiched between the rotating bodies. (A so-called six-axis crusher including a so-called roll crusher) or a crusher (a so-called shredder) that is provided with a cutter on a shaft arranged in parallel and shears the material to be crushed by rotating them in opposite directions. , Etc.). In these cases, the feeder 4 may be omitted. In these cases, a similar effect is obtained.

In the embodiment of the present invention, the feeder 4 uses the driving force of a hydraulic motor to
Although the self-propelled crusher 1 provided with the grizzly feeder for oscillating the bottom plate portion including the plurality of saw-toothed plates 4a on which the objects to be crushed are placed has been described as an example, the invention is not limited to this. That is, another type of feeder, for example, a crushed object input from a hopper is placed on a substantially flat bottom plate provided below the hopper, and the bottom plate is driven by a base driving mechanism based on a driving force generated by a hydraulic motor. A crusher equipped with a so-called plate feeder that reciprocates in a substantially horizontal direction to sequentially push out the preceding crushed material on the bottom plate by feeding the subsequent crushed material and sequentially supply the crushed material to the crushing device from the front end of the bottom plate. Is also applicable.

Further, in one embodiment of the present invention, the feeder 4, the conveyor 5, and the magnetic separator 6 are provided as auxiliary machines for performing operations related to the crushing operation by the crushing device.
Although the description has been made by taking as an example a case where the present invention is applied to a self-propelled crusher equipped with That is, a self-propelled crusher in which some of the feeder 4, the conveyor 5, and the magnetic separator 6 are appropriately omitted, for example, the crushed material is directly supplied from the hopper 2 to the jaw crusher 3 via the duct or chute without the feeder 4. For example, the magnetic separator 6 may be omitted depending on the work situation. Conversely, in addition to the feeder 4, the conveyor 5, and the magnetic separator 6, additional auxiliary machines such as an auxiliary conveyor (2) located downstream (or upstream) of the conveyor 5 in order to lengthen the path of the conveyor 5. The present invention may also be applied to a self-propelled crusher provided with a vibrating screen located downstream of the jaw crusher 3 for further sorting according to the particle size of the crushed material.

[0095]

According to the present invention, there is provided voltage conversion means for converting a first power supply voltage into a second power supply voltage which is relatively lower than the first power supply voltage, and the instrument panel is provided with a voltage conversion means. Since it is operated with the second power supply voltage generated in step (1), the size of the instrument panel can be reduced while ensuring sufficient crushing ability.

[Brief description of the drawings]

FIG. 1 is a side view showing the entire structure of a self-propelled crusher to which an embodiment of the present invention is applied.

FIG. 2 is a top view of the self-propelled crusher shown in FIG.

FIG. 3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is a top view and a side view showing a detailed structure of a control panel.

FIG. 5 is an electric circuit diagram showing an electric circuit device according to one embodiment of the present invention.

FIG. 6 is an explanatory diagram for explaining the principle of the present invention.

[Explanation of symbols]

2 Hopper 3 Jaw crusher (crushing equipment, equipment) 4 Feeder (equipment) 5 Conveyor (equipment) 6 Magnetic separator (equipment) 7 Crusher body 8 Running body 8a Tracked track 9 Track frame 10 Hydraulic motor for crushing (hydraulic actuator) 15 Hydraulic motor for feeder (hydraulic actuator) 17 Hydraulic motor for conveyor (hydraulic actuator) 18 Hydraulic motor for magnetic separator (hydraulic actuator) 21 Hydraulic motor for left and right traveling (hydraulic actuator) 32 Power unit 42 Driver's seat 150 Control panel 150a Instrument Panel part (instrument panel) 150aA Fuel gauge (display means) 150aB Water temperature gauge (display means) 150aG Relay drive circuit (relay control circuit) 150aH Relay drive circuit (relay control circuit) 150b Key switch 150c Controller 150cA Pressure conversion circuit (voltage conversion means) 150d fuse box 150dB fuse (first fuse) 150dD fuse (second fuse) 151 battery 153a fuel gauge sensor (fuel sensor, detection means) 153b water temperature gauge sensor (water temperature sensor, detection means) ) 154a Electric load for work light (electric load) 154b Electric load for horn (electric load) 155a Work light relay (relay) 155aA Switch section 155aB Drive section (coil) 155b Horn relay (relay) 155bA Switch section 155bB drive section (coil) )

Continued on the front page (72) Inventor Yoshimi Shiba 650, Kandamachi, Tsuchiura-shi, Ibaraki F-term in the Tsuchiura Plant of Hitachi Construction Machinery Co., Ltd. (Reference) 4D067 EE48 EE50

Claims (11)

[Claims] 1. A plurality of devices including a crushing device for crushing an object to be crushed received by a hopper, a plurality of hydraulic actuators including a crushing hydraulic motor for driving the crushing device and respectively driving the plurality of devices, A hydraulic pump that discharges hydraulic oil to the plurality of hydraulic actuators, a motor that drives the hydraulic pump, and a control valve device that controls the direction and flow rate of hydraulic oil supplied from the hydraulic pump to the hydraulic actuators. A battery, which is provided in a self-propelled crusher having a built-in power unit and is a supply source of a first power supply voltage, is operated by the first power supply voltage, and controls a driving operation of the control valve device. A controller comprising: a controller; detecting means for detecting state quantities relating to the prime mover and the plurality of devices; and display means for displaying a detection result of the detecting means. An electric circuit device for a self-propelled crusher having a panel, comprising: a voltage conversion unit configured to convert the first power supply voltage into a second power supply voltage relatively lower than the first power supply voltage; , The instrument panel, the second voltage generated by the voltage conversion means
An electric circuit device for a self-propelled crusher, wherein the electric circuit device is operated at a power supply voltage. 2. The electric circuit device for a self-propelled crusher according to claim 1, wherein said voltage conversion means is built in said controller. 3. The electric circuit device for a self-propelled crusher according to claim 1, wherein said first power supply voltage is approximately 24V, and said second power supply voltage is approximately 12V. Electric circuit device of traveling crusher. 4. An electric circuit device for a self-propelled crusher according to claim 1, wherein said detection means is grounded at one end, and detects said state quantity by using a change in a resistance value corresponding to a change in said state quantity. An electric circuit device for a self-propelled crusher, wherein the other end of the sensor is connected to the instrument panel so as to directly output the detected state quantity. 5. The electric circuit device for a self-propelled crusher according to claim 4, wherein said sensors are a fuel sensor for detecting a fuel amount of said motor and a water temperature sensor for detecting a temperature of cooling water of said motor. An electric circuit device for a self-propelled crusher, comprising at least one of them. 6. An electric circuit device for a self-propelled crusher according to claim 1, wherein said electric load is operated at said first power supply voltage and is connected to an accessory mechanism related to an application other than crushing. A relay for opening and closing a circuit for introducing the first power supply voltage from the battery to the electric load in response to the signal of the second power supply voltage. apparatus. 7. An electric circuit device for a self-propelled crusher according to claim 6, wherein said instrument panel includes a relay control circuit for controlling a ground side of a coil of said relay. An electric circuit device for a self-propelled crusher, wherein an end side is connected to the battery, and a ground side of a coil of the relay is connected to the relay control circuit. 8. An electric circuit device for a self-propelled crusher according to claim 7, wherein said relay control circuit is an open collector type circuit having a transistor whose emitter side is grounded, and said relay coil is grounded. The electric circuit device of the self-propelled crusher, wherein a side is connected to a collector side of the transistor. 9. An electric circuit device for a self-propelled crusher according to claim 6, wherein said electric load is an electric load for a work light used for crushing work and an electric load for a horn for calling attention to the surroundings. An electric circuit device for a self-propelled crusher, comprising at least one of them. 10. An electric circuit device for a self-propelled crusher according to claim 1, wherein a first fuse is provided in a circuit for supplying said first power supply voltage from said battery to said controller, and said voltage converting means is provided. An electric circuit device for a self-propelled crusher, wherein a second fuse that operates independently of the first fuse is provided in a circuit that supplies the second power supply voltage to the instrument panel. 11. A plurality of devices including a crushing device for crushing an object to be crushed received by a hopper, a plurality of hydraulic actuators including a crushing hydraulic motor for driving the crushing device and respectively driving the plurality of devices, A hydraulic pump that discharges hydraulic oil to the plurality of hydraulic actuators, a motor that drives the hydraulic pump, and a control valve device that controls the direction and flow rate of hydraulic oil supplied from the hydraulic pump to the hydraulic actuators. A built-in power unit,
A battery that is a supply source of a first power supply voltage, a controller that operates on the first power supply voltage and controls a driving operation of the control valve device, and a state quantity related to the prime mover and the plurality of devices. In a self-propelled crusher having a detecting means for detecting and an instrument panel provided with a display means for displaying a detection result of the detecting means, the first power supply voltage is set to be relatively higher than the first power supply voltage. Voltage conversion means for converting the power supply voltage to a lower second power supply voltage, and the instrument panel is provided with a second power supply voltage generated by the voltage conversion means.
A self-propelled crusher characterized by operating at a power supply voltage.