JP2003035398A - Level detector for rotating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a level detector for a rotating device capable of directly informing an operator that the lubricating oil in a rotation reducer run short. SOLUTION: In the level detector for the rotating device 6 provided in a hydraulic shovel, a level detecting means for detecting the level of lubricating oil stored in the rotation reducer 7 is provided at a side part of the rotating device 6, comprised of a level switch 20 for outputting an electric signal corresponding to the level of lubricating oil, and provided with a controller 24 for outputting an alarm signal when the signal output from the level switch 20 is lower than the predermined level, that is, the lower limit of an allowable range, a monitoring device 26 including an alarm device giving the alarm corresponding to the alarm signal output form the controller 24, a transmitter 28 for transmitting the data of the lubricating oil shortage memorized with a memorizing means installed in the controller 24 out of the hydraulic shovel, and an antenna 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic excavator, a mechanical excavator, a crawler crane, and other construction machines having a revolving structure, and a liquid for detecting the liquid level of lubricating oil contained in a revolving speed reducer. The present invention relates to a liquid level detecting device for a turning device having a surface detecting means.

[0002]

2. Description of the Related Art FIG. 8 is a side view of a hydraulic excavator cited as an example of a construction machine provided with a liquid level detection device for a conventional turning device.

The hydraulic excavator shown in FIG.
And the revolving unit 2 arranged on the traveling unit 1, and the traveling unit 1
A swivel wheel 3 interposed between the swivel body 2 and the revolving structure 2, a driver's cab 4 provided on the revolving structure 2, a front working machine 5 rotatably provided on the traveling structure 1 including a boom, an arm, and a bucket.
And a turning device 6 for turning the turning body 2.

FIG. 9 is a partial cross-sectional view showing the structure of a conventional liquid level detecting device for a turning device provided in the hydraulic excavator.

As shown in FIG. 9, the turning device 6 includes a turning speed reducer 7, an oil seal 8 for sealing between the turning speed reducer 7 and the turning body 2, and a motor 9 driven by the turning speed reducer 7. , And an oil supply pipe 10 for supplying a lubricating oil for lubricating the orbiting speed reducer 7. Normally, the orbiting speed reducer 7 is filled with the lubricating oil as indicated by a liquid level 13. A support pipe 12 that extends in the vertical direction and communicates with the inside of the slewing speed reducer 7 on the side of the slewing device 6, and the height of the liquid surface 13 of the lubricating oil that is housed in the support pipe 12 is detected. Bar gauge 11 for The bar gauge 11 and the support pipe 12 constitute a liquid level detecting means for detecting the liquid level of the lubricating oil housed in the swing reduction gear 7.

In FIG. 9, reference numeral 15 indicates an allowable lower limit position of the liquid surface 13, and 14 indicates an allowable upper limit position of the liquid surface 13. If the height of the liquid surface 13 of the lubricating oil in the slewing reducer 7 is between the lower limit position 15 and the upper limit position 14, the lubricating oil is given to the components in the slewing reducer 7 without any trouble, and the desired lubrication is achieved. However, when the height of the liquid surface 13 of the lubricating oil is located below the lower limit position 15, there is insufficient lubricating oil for the gear mechanism, bearings, etc. in the swing reduction gear 7, and these constituent parts May cause damage to the

Therefore, by pulling out the bar gauge 11 from the support pipe 12 and visually confirming the position of the lubricating oil adhering to the bar gauge 11, it is judged whether or not the lubricating oil in the swing reduction gear 7 is insufficient. When there is a shortage, the lubricating oil is replenished into the swing speed reducer 7 by the oil supply pipe 10.

A known technique of this type is disclosed in, for example, Japanese Unexamined Patent Publication No. 8-218424.

[0009]

The bar gauge 11 described above is used.
In the conventional technique for detecting the liquid level of the lubricating oil by the method, the liquid level of the lubricating oil is not detected unless the bar gauge 11 is pulled out from the support pipe 12. Therefore, if the pre-start inspection of the hydraulic excavator is not performed, the driver does not notice such a shortage of the lubricating oil and does not notice the lack of the lubricating oil even if the lubricating oil in the swing reduction gear 7 is insufficient. It will continue to operate.

Even if a pre-start inspection is carried out and the level of the lubricating oil is within the allowable range at the time of the inspection, during the work performed by the hydraulic excavator,
When the lubricating oil leaks from the orbiting speed reducer 7 for some reason and the lubricating oil in the orbiting speed reducer 7 becomes insufficient due to this, the driver does not notice the insufficient amount of the lubricating oil in the same manner as described above. You will continue to operate the hydraulic excavator.

As described above, in the prior art, there is a concern that the driver may operate the hydraulic excavator without noticing the lack of lubricating oil in the swing reduction gear 7, and accordingly, the gear mechanism in the swing reduction gear may be operated. It was easy to damage components such as bearings and bearings.

The present invention has been made in view of the above-mentioned conventional state of the art, and an object thereof is to provide a liquid level detection device for a swivel device which allows a driver to immediately recognize that the lubricating oil in the swivel reducer is insufficient. Especially.

[0013]

In order to achieve the above object, the present invention comprises a liquid level detecting means provided in a construction machine for detecting the liquid level of the lubricating oil housed in the swing speed reducer. In the liquid level detection device for a swivel device, the liquid level detection means is provided in the swivel device and includes a liquid level detector that outputs an electric signal according to the liquid level height of the lubricating oil. And a controller that outputs an alarm signal when the signal output from the liquid level detector corresponds to a liquid level lower than a predetermined liquid level.

In the present invention thus constructed, for example, when the construction machine is operated, the liquid level detector operates, and a signal corresponding to the liquid level in the swing speed reducer is output to the controller. When the signal output from the liquid level detector corresponds to a liquid level height lower than a predetermined liquid level height corresponding to the lower limit value within the allowable range, an alarm signal is output from the controller provided in the work machine. Is output. With this alarm signal, the driver can automatically recognize that the swing reducer is insufficient in lubricating oil. Therefore, for example, it is possible to immediately stop the construction machine and take an appropriate measure such as supplying lubricating oil.

In the above structure, the liquid level detector may be composed of a level switch which outputs an ON signal when the liquid level of the lubricating oil is lower than the predetermined liquid level.

In the above structure, the liquid level detector may be a level sensor that outputs an electric signal having a value corresponding to the liquid level of the lubricating oil.

In the above structure, a pair of the level sensors may be provided, and the level sensors may be provided at positions symmetrical with respect to the center of rotation of the turning device.

Further, in the above construction, the construction machine may include an alarm device for issuing an alarm in response to an alarm signal output from the controller.

Further, in the above structure, the controller has setting means for setting the predetermined liquid level height in advance,
Based on the signal output from the level sensor, the calculating means for calculating the liquid level height when the construction machine is mounted on a horizontal grounding surface, and the liquid level height calculated by this calculating means, Determination means for determining whether the height is lower than the predetermined liquid level set by the setting means, and output means for outputting the alarm signal when the determination means determines that the height is lower than the predetermined liquid level. A storage unit that stores the liquid level height calculated by the calculation unit may be included.

Further, in the above configuration, a transmission device capable of transmitting the liquid level height stored in the storage means of the controller to the outside of the construction machine may be provided.

Further, in the above configuration, a portable terminal device capable of downloading the liquid level height stored in the storage means of the controller may be provided.

Further, in the above construction, the construction machine may be a hydraulic excavator.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a liquid level detecting device for a turning device according to the present invention will be described below with reference to the drawings.

FIG. 1 is a partial cross-sectional view showing the structure of the essential parts of a first embodiment of a liquid level detecting device for a swivel device according to the present invention. FIG. 2 is a view showing the overall structure of the first embodiment of the present invention. FIG. 4 is a front view of an essential part showing an example of a working state of a hydraulic excavator provided with the first embodiment of the present invention, and FIG. 4 shows a configuration of the essential part of the first embodiment of the present invention at the time of working shown in FIG. FIG.

This first embodiment is also provided in, for example, a hydraulic excavator as shown in FIG. As described above, the hydraulic excavator includes the traveling body 1 and the traveling body 1
A revolving superstructure 2 arranged above, a revolving wheel 3 interposed between the traveling structure 1 and the revolving superstructure 2, and a driver's cab 4 arranged on the revolving superstructure 2.
And a turning device 6 for turning the turning body 2.

Particularly, in the first embodiment, as shown in FIG. 1, the liquid level detecting means for detecting the height of the liquid level 33 of the lubricating oil housed in the swing speed reducer 7 of the swivel device 6, A liquid level detector provided on the side of the swivel device 6 for outputting an electric signal according to the liquid level of the lubricating oil, for example, when the liquid level of the lubricating oil is lower than a predetermined liquid level, , Upper limit position 14
The level switch 20 outputs an ON signal when the liquid level is lower than the liquid level height corresponding to the lower limit position 15 of the allowable range limited by the lower limit position 15 and the lower limit position 15. The level switch 20 is composed of, for example, a float type switch having a float 21 and a contact 22 with which the float 21 can come into contact, but various types of structures such as an ultrasonic type switch and an optical sensor type switch are adopted. obtain.

Further, as shown in FIG. 2, a controller 24 connected to the level switch 20 via a signal line 23 is provided in, for example, the cab 4 of the hydraulic excavator. The controller 24 includes output means for outputting an alarm signal when the signal output from the level switch 20 is an ON signal. Further, for example, a first timer that measures the date and time and a second timer that measures the operating time of the hydraulic excavator after the lubricating oil is stored in the swing reduction gear 7 so that the liquid surface is located within the allowable range. When the above ON signal is input from the level switch 20,
The storage unit includes a storage unit that stores the date and time measured by the first timer and the operating time measured by the second timer in association with the ON signal.

In the cab 4, as shown in FIG. 2, a monitor device 26 connected to the controller 24 via a signal line 25, and a signal line 27 connected to the controller 24.
And a transmitting device 28 connected via a signal line 29. The transmitting device 28 is connected to the transmitting device 28 via a signal line 29.

The above-mentioned monitor device 26 includes an alarm device for issuing an alarm in response to a signal output from the controller 24.

By connecting the portable terminal device 31 to the above-mentioned controller 24, the stored contents stored in the above-mentioned storage means of the controller 24 can be downloaded to this portable terminal device 31.

The above-described predetermined liquid level height, that is, the liquid level height corresponding to the lower limit position 15 shown in FIG. 1, can be generated by the work performed by the hydraulic excavator as illustrated in FIG. It is set in consideration of a predetermined maximum inclination that is empirically conceivable among the inclinations of the vehicle body. Irrespective of the inclination of the main body, the level switch 20 detects the predetermined liquid level height, that is, when the lower limit position 15 is reached and outputs an ON signal.
Is installed.

That is, it is assumed that the height of the liquid surface 33 of the lubricating oil accommodated in the swing reduction gear 7 when the hydraulic excavator is horizontally arranged is within the allowable range. When this hydraulic excavator is tilted by an angle θ1 as shown in FIG. 3 along with the work, the actual liquid level is as shown by reference numeral 34, as shown in FIG. As shown in FIG.
Assuming that the distance from the center of rotation of the swivel device 6 to the level sensor 20 is L, the liquid level is apparently A, that is, L · tan θ1 with respect to the installation position of the level sensor 20.
It has fallen. This distance A is the liquid level 33 shown in FIG.
When the distance S between the lower limit position 15 and the lower limit position 15 is smaller than the distance S, the level switch 20 is kept OFF, but when the distance A shown in FIG. 4 becomes larger than the distance S shown in FIG. The surface height is lower than the lower limit position 15, that is, lower than a predetermined liquid surface height.
An ON signal is output from 0.

In the first embodiment thus constructed, for example, the lubricating oil is housed in the swing speed reducer 7 such that the liquid surface is located between the upper limit position 14 and the lower limit position 15. The operating time of the hydraulic excavator from time to time is measured by the second timer of the controller 24.

Further, for example, the level switch 20 is actuated in response to the start of the hydraulic excavator so that the ON signal can be output.

In such a state, when the hydraulic excavator operates on a flat ground or a sloping ground and excavation work is carried out, the level switch 20 continues to detect the liquid level of the lubricating oil during the work.

Now, for example, assume that when the hydraulic excavator is started from the stopped state, the liquid level of the lubricating oil is lower than the lower limit position 15 shown in FIG. In this case, the ON signal is immediately output from the level switch 20 to the controller 24 via the signal line 23. The controller 24 obtains the date and time measured by the first timer and the operating time clocked by the second timer described above in association with the output of the ON signal, and associates these date and time and the operating time with the ON signal. The signal line 2 is output from the output unit included in the controller 24 while performing the process of storing in the storage unit.
An alarm signal is output to the monitor device 26 via 5, and the alarm device in the monitor device 26 issues an alarm. This alarm makes the driver in the cab 4 notice that the lubricating oil in the swing speed reducer 7 is insufficient. Therefore, for example, the hydraulic excavator is immediately stopped and the lubricating oil is replenished.

Incidentally, for example, when the ON signal from the level switch 20 is inputted to the controller 24 and the operating time is stored in the storage means in association with this ON signal, the second signal is generated.
The timer is reset, and after the completion of the replenishment of the lubricating oil described above, the second timer starts counting time again.

When the hydraulic reducer 7 leaks lubricating oil and runs short of lubricating oil during operation of the hydraulic excavator, the lack of lubricating oil also causes the level switch 2 to fail as described above.
0 automatically detects and issues an alarm, which alerts the driver to a lack of lubricating oil.

Then, for example, after a lapse of a predetermined period of half a year or one year, the stored contents stored in the storage means of the controller 24 are sent to the transmitting device 28 via the signal line 27, and further the signal line 29 and the antenna 30. Is transmitted to a work management department of a sales office, a company, etc. located in a place formed from the work place of the hydraulic excavator. The work management section carries out various work analyzes based on the transmitted data. For example, the relationship between the operating time of the hydraulic excavator and the lubricating oil replenishment time is grasped based on the transmitted data, and thereby the lubricating oil replenishment due date is predicted.

Further, for example, the portable terminal device 31 is connected to the controller 24, the storage contents of the storage means of the controller 24 are downloaded, and the portable terminal device 31 is brought to a work management department such as a sales office as described above. You may make it perform a work analysis.

According to the first embodiment having such a configuration, when the lubricating oil in the swing speed reducer 7 is insufficient, the driver in the cab 4 immediately recognizes it by the ON signal of the level switch 20. As a result, it is possible to reliably prevent damage to the components such as the gear mechanism and bearings in the swing reduction gear 7 due to lack of lubricating oil.

Further, it is possible to obtain information on the lubricating oil accommodated in the swing reducer 7 of the hydraulic excavator via the transmitting device 28 and the portable terminal device 31, and to carry out the prediction of the lubricating oil supply date. be able to.

FIG. 5 shows the structure of the essential parts of the second embodiment of the present invention. Particularly, FIG. 5 is a partial sectional view showing the state of the second embodiment during the work shown in FIG. 3, and FIG. 6 shows the second embodiment of the present invention. It is a figure which shows the whole structure of.

This second embodiment is also provided, for example, in a hydraulic excavator, and as a liquid level detector for outputting an electric signal according to the liquid level of the lubricating oil, as shown in FIG. A pair of level sensors 35 and 36, which output electric signals having values corresponding to the surface height, are provided at positions symmetrical with respect to the center of rotation of the swivel device 6, that is, on each side of the swivel device 6 in total. There is. These level sensors 35,
The reference numeral 36 is, for example, a float type. Also,
As shown in FIG. 6, each of the level sensors 35 and 36 is connected to the controller 24 via signal lines 23 and 40.

Further, in the second embodiment, the controller 24 has setting means for presetting a predetermined liquid level height SO of the lubricating oil housed in the swing reduction gear 7, that is, the above-mentioned lower limit position 15. Calculating means for obtaining a liquid level height AO when the hydraulic excavator is placed on a horizontal grounding surface, based on signals output from the level sensors 35, 36;
The liquid level height AO obtained by the calculating means is determined by the determining means for determining whether the liquid level height AO is lower than the predetermined liquid level SO set by the setting means, and the calculating means is obtained by the determining means. When it is determined that the liquid level height AO is lower than the predetermined liquid level height SO set by the setting unit, the output unit that outputs an alarm signal, the first timer that measures the date and time, and the swing speed reducer 7 , A second timer that measures the operating time of the hydraulic excavator from the time when the lubricating oil is stored so that the liquid level is within the allowable range, the date and time measured by the first timer, and the time measured by the second timer The storage unit stores the calculated operating time in association with the calculated liquid level height AO, for example.

The other structure is the same as that of the first embodiment.

In FIG. 5, 37 indicates the liquid surface of the lubricating oil when the hydraulic excavator is placed on a flat surface and is horizontal, and 44 indicates the hydraulic excavator at an angle θ1 as shown in FIG. 7 shows the liquid surface of the lubricating oil in the state of being inclined to the right, and reference numeral 45 represents the liquid surface of the lubricating oil in the state of being inclined to the left at the angle θ2, as shown in FIG. 7 described later.

When the hydraulic excavator is tilted to the right by the angle θ1, at this time, if the hydraulic excavator is assumed to be placed on a flat ground, the liquid level height of the lubricating oil in the horizontal state is A
When O is set, the liquid level height detected by the level sensor 35 is AO-L · tan θ1 (1). The liquid level height detected by the level sensor 36 is AO + L · tan θ1 (2). From these equations (1) and (2), {(AO-L · tan θ1) + (AO + L · tan θ
1)} / 2 = AO.

That is, in the above-mentioned calculation means of the controller 24, a calculation for obtaining the average value of the value of the signal output from the level sensor 35 and the value of the signal output from the level sensor 36 is carried out. AO is required to determine the liquid level of the lubricating oil when it is level when it is assumed that it is placed on a flat ground.

The operation of the second embodiment having such a configuration is also performed in substantially the same manner as in the above-described first embodiment.

For example, in the hydraulic excavator from the time when the lubricating oil is accommodated in the swing speed reducer 7 so that the horizontal liquid level 37 shown in FIG. 5 is located within the allowable range between the upper limit position and the lower limit position. The operating time is measured by the second timer of the controller 24.

Further, for example, the level sensors 35 and 36 are actuated with the start of the hydraulic excavator, and respective signals are input to the controller 24.

In such a state, when the hydraulic excavator operates on a flat ground or a sloping ground and excavation work is carried out, the level sensors 35 and 36 are operated during the work.
Continues to detect the level of lubricating oil.

For example, if the hydraulic excavator is started from a stopped state, the signals of the level sensors 35 and 36 are input to the controller 24 via the signal lines 23 and 40 at that time as described above. The calculating means of the controller 24 performs the above-described calculation based on the signals output from the level sensors 35 and 36, and when the hydraulic excavator is placed on a flat ground, the liquid level height A of the lubricating oil in the horizontal state is set.
Ask for O.

Next, the judgment means included in the controller 24 is a predetermined liquid level height S set by the setting means.
O is compared with the liquid level height AO calculated. When it is determined that the liquid level height AO is equal to or higher than the predetermined liquid level height SO, there is no shortage of lubricating oil, and the liquid level height AO at that time is measured by the first timer. Date and time,
Although it is stored in the storage unit in association with the operating time measured by the second timer, the process of outputting the alarm signal is not executed.

The liquid level height A calculated by the above determination means
When it is determined that O is lower than a predetermined liquid level height SO that is a set value, the liquid level height AO at that time is given a unique sign, for example, and the date and time measured by the first timer, the second A process of storing in the storage means in association with the operating time measured by the timer is performed, and an alarm signal is output from the output means.

This alarm signal is given to the monitor device 26 via the signal line 25, and the alarm device in the monitor device 26 issues an alarm. This alarm makes the driver in the cab 4 notice that the lubricating oil in the swing speed reducer 7 is insufficient. Therefore, for example, the hydraulic excavator is immediately stopped and the lubricating oil is replenished.

Note that, for example, the determination means of the controller 24 determines that the calculated liquid level height AO is lower than the predetermined liquid level height SO, and the liquid level height AO at that time is measured by the second timer. When the hydraulic excavator is in operation, the second timer is reset at the time when the hydraulic excavator is stored in the storage means in association with In addition, when the turning speed reducer 7 leaks lubricating oil and runs short of lubricating oil,
Similarly to the above, the lack of lubricating oil indicates that the level sensors 35, 36
Is automatically detected and an alarm is issued, and the alarm is noticed to the driver by the alarm.

During the operation of the hydraulic excavator, the stored contents stored in the storage means of the controller 24 are sent to the transmitting device 28 via the signal line 27, for example, every operating day, and further, the signal line 29 and the antenna. For example, the information is transmitted via 30 to a work management department such as a sales office or a company located away from the work place of the hydraulic excavator. The work management section carries out various work analyzes based on the transmitted data. For example, the timing of lubricating oil supply is estimated.

Further, for example, when an alarm is issued from an alarm device included in the monitor device 26 and the hydraulic excavator is stopped, the portable terminal device 31 is controlled by the controller 2.
4 to download the stored contents of the storage means of the controller 24, bring this portable terminal device 31 to a work management department such as a sales office, and confirm the amount of lubricating oil when an alarm is issued. You may perform work, such as determining the amount of replenishment.

The same applies to the case where the main body of the hydraulic excavator is tilted to the left as shown in FIG. In FIG. 7, 43 is a ground contact surface on which the hydraulic excavator is placed,
42 indicates a horizontal plane, and θ2 indicates an angle of the ground contact surface 43 with respect to the horizontal plane 42, that is, an inclination angle of the hydraulic excavator.
In this case, as shown in FIG. 5, the calculation means of the controller 24 is ((AO + L · tan θ2) + (AO−L · tan θ).
2)} / 2 = AO 2 is calculated, and the liquid level height AO of the lubricating oil when the hydraulic excavator is placed on a flat surface and horizontal is obtained.

In the second embodiment having such a configuration, as in the case of the first embodiment described above, when the lubricating oil in the swing speed reducer 7 becomes insufficient, the level sensors 35 and 36 immediately notify the same. This can be recognized by the driver in the operator's cab 4, whereby damage to components such as the gear mechanism and bearings in the swing reduction gear 7 due to lack of lubricating oil can be reliably prevented.

Further, the information about the lubricating oil accommodated in the swing reducer 7 of the hydraulic shovel can be obtained via the transmitting device 28 and the portable terminal device 31, including the information before the lack of the lubricating oil occurs, and the lubrication can be performed. It can be used as oil management data.

[0064]

According to the present invention, when the lubricating oil in the swing speed reducer is insufficient, the driver can recognize it immediately, that is, automatically according to the signal output from the liquid level detector. It is possible to reliably prevent damage to components such as the gear mechanism and bearings in the swing speed reducer 7 due to a shortage of lubricating oil, which has been apt to occur in the past, and to prevent work interruption of the construction machine due to these damages. Workability can also be improved compared to.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a main part configuration of a first embodiment of a liquid level detection device for a swivel device according to the present invention.

FIG. 2 is a diagram showing an overall configuration of a first embodiment of the present invention.

FIG. 3 is a front view of essential parts showing an example of a state at the time of working of the hydraulic excavator provided with the first embodiment of the present invention.

FIG. 4 is a partial cross-sectional view showing the main configuration of the first embodiment of the present invention during the work shown in FIG.

FIG. 5 is a partial cross-sectional view showing a main part configuration of a second embodiment of the present invention, and particularly showing a state of the second embodiment during the work shown in FIG.

FIG. 6 is a diagram showing an overall configuration of a second embodiment of the present invention.

FIG. 7 is a front view of essential parts showing another example of the state of the hydraulic excavator provided with the second embodiment of the present invention during work.

FIG. 8 is a side view of a hydraulic excavator taken as an example of a construction machine provided with a liquid level detection device for a conventional turning device.

FIG. 9 is a partial cross-sectional view showing a configuration of a liquid level detection device of a conventional swivel device.

[Explanation of symbols] 2 revolving structure 4 cab 6 swivel device 7 Turning reducer 15 Lower limit position 20 level switch (liquid level detector) 23 signal lines 24 controller 25 signal lines 26 Monitor device 27 signal line 28 transmitter 29 signal lines 30 antenna 31 Mobile terminal device 35 Level sensor (liquid level detector) 36 Level sensor (liquid level detector)

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takeshi Kurihara             Hitachi Construction Machinery Co., Ltd.             Ceremony Company Tsuchiura Factory (72) Inventor Yuji Ikawa             Hitachi Construction Machinery Co., Ltd.             Ceremony Company Tsuchiura Factory (72) Inventor Shishikawa Shishi             Hitachi Construction Machinery Co., Ltd.             Ceremony Company Tsuchiura Factory (72) Inventor Akihiro Tanaka             Hitachi Construction Machinery Co., Ltd.             Ceremony Company Tsuchiura Factory (72) Inventor Shinichi Sekido             Hitachi Construction Machinery Co., Ltd.             Ceremony Company Tsuchiura Factory F-term (reference) 2D015 DA04 GA03 GB04 HA03 HB00                 3F205 AA07 EA10

Claims (9)

[Claims] 1. A liquid level detection device for a swivel device, which is provided in a construction machine and has a liquid level detection device for detecting a liquid level height of a lubricating oil housed in a swivel speed reducer, wherein the liquid level detection device comprises: The turning device is provided with a liquid level detector that outputs an electric signal according to the liquid level of the lubricating oil, and the signal output from the liquid level detector provided in the construction machine is predetermined. And a controller for outputting an alarm signal when the liquid level is lower than the liquid level of the swirl device. 2. The liquid level detector comprises a level switch for outputting an ON signal when the liquid level of the lubricating oil is lower than the predetermined liquid level.
A liquid level detection device for the swivel device described. 3. The liquid level detector of the swivel device according to claim 1, wherein the liquid level detector comprises a level sensor that outputs an electric signal having a value corresponding to the liquid level of the lubricating oil. apparatus. 4. The turning device according to claim 3, wherein a pair of the level sensors are provided, and the level sensors are respectively provided at positions symmetrical with respect to the center of rotation of the turning device. Liquid level detector. 5. The liquid level detection of a turning device according to claim 1, wherein the construction machine includes an alarm device that issues an alarm in response to an alarm signal output from the controller. apparatus. 6. When the controller mounts the construction machine on a horizontal grounding surface based on a setting unit that presets the predetermined liquid level height and a signal output from the level sensor. Calculating means for calculating the liquid level height of the liquid level, a judging means for judging whether the liquid level height calculated by the calculating means is lower than the predetermined liquid level height set by the setting means, and this judging means. When it is determined that the liquid level is lower than the predetermined liquid level, the output means outputs the alarm signal, and the storage means stores the liquid level calculated by the calculation means. Item 5. A liquid level detection device for a swivel device according to item 3 or 4. 7. The liquid surface of the swivel device according to claim 6, further comprising a transmission device capable of transmitting the liquid surface height stored in the storage means of the controller to the outside of the construction machine. Detection device. 8. The liquid level detection device for a swivel device according to claim 6, further comprising a portable terminal device capable of downloading the liquid level height stored in the storage means of the controller. 9. The liquid level detection device for a swivel device according to claim 1, wherein the construction machine comprises a hydraulic excavator.