JPH0529261Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a construction machine used as, for example, a hydraulic excavator, a hydraulic crane, or the like.

[Prior art]

In general, a hydraulic excavator, which is a typical example of this type of construction machinery, includes a lower traveling body that is driven by a hydraulic motor for travel, an engine that is rotatably provided on the lower traveling body, and an engine that is driven by the engine. An upper revolving body having a machine room equipped with a driven hydraulic pump, etc., and a driver's cab operated by a driver; and a boom, an arm, a bucket, and each hydraulic system provided on the upper revolving body to drive these. It is equipped with a working device consisting of a cylinder. When driving, pressure oil from the hydraulic pump is supplied to the driving motor to move the car body, and during work, pressure oil is normally supplied and discharged to the boom cylinder, arm cylinder, and bucket cylinder with the car body stopped. By doing this, excavation work etc. with a bucket can be performed.

In order to ensure drivability and safety, the operator's cab is equipped with various instruments and alarms that indicate the status of the machine and can be checked by the driver sitting in the driver's seat. However, in order to ensure visibility during work, the front of the operator's cab is made of glass.
It is necessary to ensure that the operation of working equipment can be visually observed. For this reason, placing various instruments and alarms in front of the driver's seat will obstruct visibility, so for hydraulic excavators, etc., these instruments and alarms should be placed on the right or left side of the driver's seat. The instrument is configured to fit into an instrument stand.

[Problem that the invention attempts to solve]

However, when operating construction machinery such as hydraulic excavators, the driver concentrates on the excavation work using the work equipment, and the instruments and alarms housed in the instrument stand on the side are out of sight. Even if the machine is in an abnormal or dangerous state during work, it may not be noticed.

In particular, during work, in order to maintain the hydraulic pump at maximum discharge pressure, the engine is normally run at full power and at maximum speed. As a result, even if the pressure of the engine lubricating oil that lubricates the engine is lower than the set pressure, or the temperature of the engine cooling water is higher than the set temperature, there is a problem that people may continue working without noticing this. be.

Therefore, unlike ordinary passenger cars, construction machinery is unique in that the engine is run at full power and at maximum speed during work, which can lead to situations where smoke is emitted from the engine and an outsider is required to do so. The problem is that in many cases, the engine may be burnt out.

Furthermore, even if there is an alarm in the driver's cabin that alerts the operator to these conditions, the alarm may be turned off or the wiring may be cut off because it will interfere with work if the alarm goes off. .

On the other hand, the same applies to hydraulic oil tanks that store hydraulic oil for hydraulic pumps, and there is a problem that even if the oil level in the hydraulic oil tank drops below the minimum level due to oil leakage from the hydraulic piping, this will not be noticed. be.

Furthermore, during work, the driver is so focused on the original task that even if the vehicle tilts dangerously close to tipping over, the driver does not notice this, and only notices this when an outsider becomes concerned and alerts the driver. There are also situations.

This invention addresses the above-mentioned problems, especially in the case of construction machinery, in which the engine is operated at full power and at maximum speed during work, so when the pressure of lubricating oil or the temperature of cooling water becomes abnormal or dangerous. The object of the present invention is to provide a construction machine that can widely notify this information to third parties and call attention to the driver.

[Means for solving problems]

In order to solve the above problems, the feature of the configuration adopted by the present invention is that an alarm means is provided on the upper revolving structure at a position that can be recognized by an outsider other than the driver, and the alarm means is provided with an alarm means that lubricates the engine. The structure is such that an alarm is issued to an outsider when at least one of the pressure of lubricating oil, the temperature of cooling water for cooling the engine, and the angle of inclination of the upper revolving structure becomes abnormal or dangerous.

[Effect]

During work, if an abnormal or dangerous situation is reached due to a drop in lubricating oil pressure, a rise in cooling water temperature, or a tilting of the upper revolving structure, the alarm means will issue an alarm to outsiders other than the driver. Accidents can be prevented by this outsider alerting the driver.

〔Example〕

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

First, in FIGS. 1 and 2, reference numeral 1 denotes an undercarriage, and the undercarriage 1 has left and right crawler tracks 1B, 1B operated by a hydraulic motor 1A for travel. Reference numeral 2 denotes an upper revolving body which is rotatably provided on the lower traveling body 1 via a revolving device (not shown), and the upper revolving body 2 has a machine room 2 occupying a central portion.
A and a driver's cab 2B located on the left front side. Here, inside the machine room 2A, an engine 3 serving as a power source, a hydraulic oil tank 4 storing hydraulic oil, hydraulic pumps 5, 5, etc., which are driven by the engine 3 and sucking and discharging the hydraulic oil in the hydraulic oil tank 4, etc. (See Figure 2). On the other hand, inside the driver's cab 2B is the third
As shown in the figure, a driver's seat 6, control levers 7, 7, ... located in front of the driver's seat 6, an instrument stand 8 located on the right side of the driver's seat 6, and an angle meter 22A to be described later.
etc. are provided. On the upper surface of the instrument stand 8, in addition to a plurality of instruments 9, a lubricating oil pressure alarm lamp 10, a cooling water temperature alarm lamp 11, a hydraulic oil level alarm lamp 12, and a vehicle body tilt alarm lamp 13 are provided.
Various alarm devices are provided. Also, 1
4 is a working device provided on the upper revolving body 2;
The working device 14 consists of a boom 15, an arm 16, a bucket 17, and a hydraulic cylinder for driving these.

Next, 18 indicates an alarm device such as an alarm lamp or an alarm buzzer to notify an outside person other than the worker (hereinafter referred to as a third party) of an abnormality or dangerous condition of the machine.
In this embodiment, the alarm 18 is installed on the roof of the driver's cab 2B so that a third party can easily notice it. As will be described later, the alarm 18 is activated when any of the lubricating oil pressure, cooling water temperature, hydraulic oil level, vehicle body inclination, etc. becomes abnormal.

Furthermore, 19 is a normally open lubricating oil pressure detection switch, which detects the pressure within the lubricating oil system that supplies lubricating oil to the engine 3, and closes when the pressure falls below a predetermined pressure. Reference numeral 20 denotes a normally open coolant temperature detection switch, which detects the temperature in the coolant circulation system of the engine 3 and closes when the temperature reaches a predetermined temperature or higher. Reference numeral 21 indicates a normally open hydraulic oil level detection switch, which is closed when the oil level in the hydraulic oil tank 4 falls below a predetermined level. Furthermore, 22 is a normally open vehicle body tilt detection switch, and the detection switch 22 is, for example,
It is provided in an angle meter 22A provided in B, and closes when the upper revolving body 2 is tilted at a predetermined angle or more at which there is a risk of overturning in the front-rear direction or left-right direction. It should be noted that among these detection switches 19 to 22, except for the vehicle body inclination detection switch 22, which is specifically provided in this embodiment, these switches have been conventionally provided in this type of hydraulic excavator.

Furthermore, in FIG. 4, 23 is a generator driven by the engine 3, 24 is a fuse box,
25 is a battery for backup, 26, 26,
... indicates a diode for backflow prevention. Between the generator 23, battery 25, and ground, there are alarm lamps 10 to 13 and detection switches 19 to 22.
are connected in series, and the alarm 18 connects each detection switch 19 to 22 via each diode 26.
It is connected to the. Therefore, each detection switch 19
When any one of the detection switches 19 to 22 is closed, the alarm 18 is activated, and when each of the detection switches 19 to 22 is closed, the corresponding alarm lamps 10 to 13 are activated individually. It's summery.

The present embodiment is configured as described above, and its operation will be described next.

First, during normal operation, each of the detection switches 19 to 22 is open, so the alarm 18 is not activated, and each of the alarm lamps 10 to 13 is not lit.

If the lubricating oil pressure drops below a predetermined value due to a failure in the lubricating oil system of the engine 3 during work, for example, a failure in the lubricating oil pump, pressure regulating valve, etc., the lubricating oil pressure detection switch 19 closes and an alarm is activated. lamp 1
0 lights up and the alarm 18 is activated,
At this time, since the warning lamp 10 is provided on the instrument stand 8, the operator may not notice this. However, the alarm 18 is provided on the roof of the driver's cab 2B. A third party can immediately recognize the activation of the alarm 18 and can notify the worker of an abnormal situation. As a result, even workers who were too focused on their work to notice the drop in engine lubricating oil pressure can notice the drop in engine lubricating oil pressure from the lighting of the warning lamp 10, and can immediately stop the engine 3 to prevent a burnout accident. can do.

On the other hand, during work, the engine 3 is driven at full power, so when the coolant temperature reaches a predetermined temperature or higher, the coolant temperature detection switch 20 closes, and the alarm 18 and alarm lamp 11 operate as described above.

Therefore, in this case as well, a burnout accident of the engine 3 can be prevented by having someone other than the driver who notices the activation of the alarm 18 notify the driver of this abnormal condition.

The same applies when the hydraulic oil level detection switch 21 is closed, and in this case, the hydraulic pump 5
This can prevent failures in the hydraulic system, including the

Furthermore, the driver may be so focused on the front work using the work device 14 that he or she may not notice even if the vehicle body is tilted to the point where it is in danger of tipping over. However, in this embodiment, the angle meter 22A is provided with a vehicle body tilt detection switch 22 that closes when the vehicle tilts by a predetermined angle, and when the alarm 18 is activated by the detection switch 22, a third party can Recognizing the abnormal slope, the third party can notify the driver and evacuate from the danger area.

In the embodiment, a hydraulic excavator is used as an example of a construction machine, but the same applies to a hydraulic crane, and the construction machine is not limited to a tracked vehicle, but may be a wheeled vehicle. Further, the alarm 18 is not limited to the one installed in the driver's cab 2B, but also in the machine room 2A,
It may also be provided in the work device 14 or the like. Further, a hydraulic oil level detection switch 21 and a vehicle body tilt detection switch 22 may be provided as necessary.

[Effect of idea]

The present invention, as described in detail above, issues an alarm to outsiders when at least any of the lubricating oil pressure, cooling water temperature, and inclination angle of the upper revolving structure becomes abnormal or dangerous. Since the structure is equipped with a warning means, even if the driver does not notice these abnormalities, an outside party can recognize them and alert the driver, thereby preventing engine burnout or falling accidents. can be prevented.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view showing the hydraulic excavator according to this embodiment, Fig. 2 is a plan view of the upper revolving structure, Fig. 3 is a plan view of the inside of the operator's cab, and Fig. 4 is a circuit configuration diagram used in this embodiment. It is. 1... Lower traveling body, 2... Upper revolving body, 2A...
...Machine room, 2B...Driver's cab, 3...Engine, 4
...Hydraulic oil tank, 8...Instrument stand, 10...
...Lubricating oil pressure alarm lamp, 11...Cooling water temperature alarm lamp, 12...Hydraulic oil level alarm lamp, 1
3... Vehicle tilt warning lamp, 14... Work equipment,
18... Alarm (alarm means), 19... Lubricating oil pressure detection switch, 20... Cooling water temperature detection switch, 21... Hydraulic oil level detection switch, 22...
...Vehicle body tilt detection switch.

Claims (1)

[Scope of utility model registration request] A lower traveling body, an upper rotating body that is rotatably provided on the lower traveling body, has a machine room in which an engine is mounted, and a driver's cab operated by a driver, and a working device provided on the upper rotating body. In the construction machine, the upper revolving body is provided with an alarm means at a position that can be recognized by an outsider other than the driver, and the alarm means is configured to detect the pressure of lubricating oil that lubricates the engine, the pressure of lubricating oil that cools the engine, and the like. 1. A construction machine configured to issue an alarm to an outside person when at least one of the cooling water temperature and the inclination angle of the upper rotating body becomes abnormal or dangerous.