JPH11324013A - Automatic greasing device for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect breakage of an oil film by making use of existing sensors provided in advance in a construction machine to control greasing and also control the posture or a working device by use of the sensor. SOLUTION: Stroke sensors 18-20 are fitted to respective cylinders 11-13 driving a working device 7 and connected to a controller 39. The controller 39 adds up the stroke quantities output from the stroke sensors 18-20 to compute the added stroke quantity. When the integrated stroke quantity exceeds a specified stroke quantity where an oil film is regarded as a broken condition, a grease pump 32 is driven to feed grease to a plurality of greasing points through a grease feeding structure 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic lubrication device for a construction machine, for example, which automatically lubricates each greasing portion of the construction machine.

[0002]

2. Description of the Related Art In general, a construction machine such as a hydraulic shovel is provided with a working device including a boom, an arm, a bucket and the like driven by an actuator such as a hydraulic cylinder. Further, in such a working device, a plurality of bearing devices are provided at a portion where the hydraulic cylinder and the boom, the arm, and the bucket are connected, and these bearing devices are lubrication portions that require lubrication of lubricating oil. I have. Then, it is necessary to lubricate these lubricating parts with lubricating oil at predetermined time intervals in order to prevent oil film shortage. For this reason, an automatic greasing device is attached to the construction machine.

Here, as an automatic lubricating apparatus according to the first prior art, for example, as disclosed in Japanese Patent Application Laid-Open No. 1-190837, a pump means for discharging grease as a lubricating oil and a pump means for discharging grease as the lubricating oil. Lubricating oil supply means for supplying grease to a greasing portion such as a bearing device, and a controller for driving the pump means when the engine has been operated for a set cumulative time to supply grease to the greasing portion. Are known.

Further, as an automatic greasing device according to the second prior art, for example, Japanese Patent Application Laid-Open No. Hei 4-351400 discloses a temperature sensor, a vibration G sensor and the like for detecting oil film breakage at a greasing portion such as a bearing device. A special sensor is provided separately, and grease is supplied to a grease supplying portion when the sensor detects that the oil film has run out.

Further, as an automatic greasing device according to a third prior art, for example, Japanese Patent Application Laid-Open No. 9-137466 discloses
There is disclosed a configuration in which an operation lever for operating a working device is provided with an operation lever switch, and whether the operation lever is operated by the operation lever switch is detected. Accordingly, in the automatic greasing device according to the third conventional technique, the time during which the operation lever is operated is added, and the time during which the working device is actually operated, that is, the grease is greased according to the work frequency. can do.

[0006]

By the way, in the above-mentioned automatic greasing apparatus according to the first prior art, the greasing is automatically performed when the engine of the construction machine is operated for a preset cumulative time to start the work. Therefore, for example, in the work of loading earth and sand into the dump, even when the working device etc. is not operated, such as when waiting for the dump, each greasing part is operated every time the set accumulation time is operated. Lubrication will be performed.

[0007] For this reason, grease is supplied to each grease supply portion even though the oil film is not broken, so that the grease is wasted and the running cost is increased. There is a problem.

Further, in the second prior art, grease can be supplied only to a greasing portion where an oil film has run out. However, in order to detect the oil film running out, a special sensor is installed in a greasing portion such as a bearing device. It must be provided separately.

In the third prior art, grease can be supplied according to the operation frequency, and unnecessary lubrication can be omitted. However, an operation lever switch for detecting whether or not the operation lever is operated is separately provided. There is a need. For this reason, the second and third conventional techniques have a problem that the manufacturing cost of the construction machine increases.

[0010] The present invention has been made in view of the above-described problems of the prior art, and the present invention monitors an oil film shortage at a greasing portion using an existing sensor provided in advance in a construction machine.
It is an object of the present invention to provide an automatic lubrication device for a construction machine that can supply lubricating oil to a lubrication site when an oil film breaks.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a construction machine provided with a working device driven by an actuator, comprising: a pump means for discharging lubricating oil; An automatic lubricating device for a construction machine, comprising: a lubricating oil supply means for supplying the discharged lubricating oil to a lubricating portion of the working device; Applied to

[0012] The first aspect of the invention is characterized in that the lubricating oil supply control means includes a drive amount detection means for detecting a drive amount of the actuator, and a drive amount detected by the drive amount detection means. Driving amount integrating means for integrating, and driving the pump means when the integrated driving amount calculated by the driving amount integrating means exceeds a predetermined driving amount at which greasing is required at the greasing portion, thereby performing the lubrication. And a grease supply means for supplying grease to the grease supply portion from the oil supply means.

With this configuration, the driving amount of the actuator is detected by the driving amount detecting means, and the integrated driving amount obtained by integrating the driving amounts by the driving amount integrating means is calculated. Then, when the integrated drive amount exceeds a predetermined drive amount that requires lubrication by the greasing unit, the pump unit is driven to lubricate the greasing portion through the lubricating oil supply unit.

According to a second aspect of the present invention, there is provided a construction machine comprising: a boom driven by a boom cylinder rotatably provided on a vehicle body; and an arm provided at an end of the boom and rotated by an arm cylinder. A hydraulic shovel provided with a working device comprising a bucket provided on the distal end side of the arm and rotated by a bucket cylinder, wherein the drive amount detecting means is configured to directly detect the movement of the boom, the arm, and the bucket. It is in.

Thus, the movement of the boom, the arm, and the bucket can be directly detected by the drive amount detecting means, and the posture of the working device can be detected. In addition, it is possible to determine whether or not lubrication is required at the greasing portion using the driving amount detected by the driving amount detecting means.

Further, the invention of claim 3 is that the drive amount detecting means is constituted by a stroke sensor provided on the boom cylinder, the arm cylinder, and the bucket cylinder and detecting a stroke amount as a drive amount.

With this configuration, it is possible to determine whether or not lubrication is necessary by using the stroke amount of each cylinder detected by the stroke sensor, and control the lubrication to the greasing portion.

Further, the invention of claim 4 is that the drive amount detecting means is constituted by a potentiometer for detecting a rotation angle of a boom, an arm or a bucket as a drive amount.

Thus, it is possible to determine whether or not lubrication is required by using the rotation angles of the boom, arm and bucket detected by the potentiometer, and to control the lubrication to the greasing portion.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment in which an automatic lubrication device for a construction machine according to an embodiment of the present invention is applied to a hydraulic shovel will be described in detail with reference to FIGS.

First, FIG. 1 to FIG. 5 relate to a first embodiment of the present invention, and 1 indicates a hydraulic shovel as a construction machine, wherein the hydraulic shovel 1 includes a lower traveling body 2 and a lower traveling body 2. An upper revolving structure 4 is provided on the upper side so as to be revolvable via a revolving device 3. The upper revolving structure 4 is provided with a cab 5 provided on the front side thereof and a rear side of the cab 5. A machine room 6 accommodating a grease pump 32 and the like, which will be described later, and a working device 7 provided on a front portion of the upper revolving unit 4 located on the side of the cab 5.

Here, the working device 7 includes the upper revolving unit 4
A boom 8 connected to a front portion of the boom 8 so as to be able to move upward and downward, and an arm 9 connected to a distal end side of the boom 8 so as to be able to move upwardly
And a bucket 10 rotatably pin-connected to the tip end of the arm 9. The boom 8, the arm 9, and the bucket 10 are provided with a boom cylinder 11, an arm cylinder 12, and a bucket cylinder 13 as actuators, and are driven by the boom cylinder 11, the arm cylinder 12, and the bucket cylinder 13.

As shown in FIG. 3, the boom cylinder 11 is formed in a bottomed cylindrical shape and has a tube 14 provided with a mounting eye 14A at a base end thereof, and a rod guide provided at a distal end of the tube 14. 15, a piston 16 slidably provided in the tube 14 and defining two oil chambers A and B in the tube 14, a base end connected to the piston 16 and a distal end protruding outside the tube 14. And a rod 17. A mounting eye 17A is provided on the distal end side of the rod 17.

Further, the boom cylinder 11 includes the tube 1
4 is connected to the upper revolving unit 4 through the mounting eye 14A, and the boom 8 is mounted through the mounting eye 17A of the rod 17.
Is pin-connected. And the boom cylinder 11
The piston 16 is slidably displaced by supplying and discharging pressurized oil into and from the oil chambers A and B from outside through supply and discharge ports 14B and 14C formed in the tube 14.
7 is expanded and contracted. Thereby, the boom cylinder 11
Is for rotating the boom 8.

Reference numerals 18, 19 and 20 denote stroke sensors as drive amount detecting means.
Reference numerals 9 and 20 are attached to the boom cylinder 11, the arm cylinder 12, and the bucket cylinder 13 in advance to control the posture of the working device 7. Each of the stroke sensors 18, 19, 20 is connected to a controller 39 described later. Thus, the stroke sensors 18, 19, and 20 directly detect the movements of the boom 8, the arm 9, and the bucket 10, and output signals corresponding to the stroke amounts ΔXa, ΔXb, and ΔXc as drive amounts to the controller 39. doing.

Here, the stroke sensor 1 for the boom 8
8 will be described as an example.
Is composed of a plurality of magnets 18A embedded at equal intervals from the base end to the tip end of the rod 17, and a magnetic detector 18B provided on the rod guide 15 and capable of facing each of the magnets 18A. Have been.

Each magnet 18A is connected to the rod 1
When 7 expands and contracts, it is displaced together with the rod 17 and approaches and separates from the magnetic detector 18B. At this time, the magnetic detector 18B detects a magnetic field generated by each magnet 18A and outputs a pulse-like signal. As a result, the stroke sensor 18 counts the pulse signal output from the magnetic detector 18B, and outputs a signal corresponding to the stroke amount ΔXa as the drive amount of the boom cylinder 11.

Further, the arm cylinder 12 and the bucket cylinder 13 are configured in substantially the same manner as the boom cylinder 11,
The arm cylinder 12 and the bucket cylinder 13 have the same stroke sensors 19 and 2 as the stroke sensors 18.
0 is provided. The stroke sensor 19 outputs a signal corresponding to the stroke amount ΔXb of the arm cylinder 12, and the stroke sensor 20 outputs a signal corresponding to the stroke amount ΔXc of the bucket cylinder 13.

For this reason, a controller 39 to be described later
Each of the cylinders 11 to
13 can be detected, that is, the extent of expansion and contraction. Therefore, the controller 39
Can calculate the rotation angles α, β, γ of the boom 8, the arm 9, and the like using the stroke amounts ΔXa to ΔXc as shown in FIG. Thus, the controller 39 can determine, for example, whether or not the bucket 10 has reached the vicinity of the cab 5, and when the bucket 10 has reached the vicinity of the cab 5, the controller 39 stops the working device 7.

21A, 21B, 21C, 21D, 21
E, 21F, 21G, 21H, 21J, 21K, 21L
Is a lubrication unit to which grease as lubricating oil is supplied.

Here, the greasing portions 21A and 21B are greasing portions composed of a tube-side bearing device of the boom cylinder 11, and the greasing portions 21C and 21D connect the base end side of the boom 8 to the upper rotating body 4. This is a lubrication site composed of a bearing device that performs the following. Also, the lubrication units 21E and 21F are connected to the boom cylinder 11
Lubrication part consisting of a rod-side bearing device of
Reference numeral 1G denotes a greasing portion formed of a tube-side bearing device of the arm cylinder 12. Further, the greasing portions 21H and 21J are greasing portions formed of a bearing device for connecting the boom 8 and the arm 9, and the greasing portion 21K is a greasing portion formed of a tube-side bearing device of the bucket cylinder 13. Fat part 21L
Numeral denotes a greasing portion composed of a rod-side bearing device of the arm cylinder 12.

Next, an automatic lubrication apparatus applied to the present embodiment will be described with reference to FIGS.

Reference numeral 31 denotes each greasing unit 21A- of the hydraulic excavator 1.
21L shows an automatic greasing device provided for greasing grease to 21L. The automatic greasing device 31 includes stroke sensors 18 to 20, a grease pump 32 described later, a grease supply mechanism 34, a controller 39, and the like. ing.

Reference numeral 32 denotes a grease pump as a pump means. The grease pump 32 is driven by compressed air supplied from the outside, and is driven and stopped according to a control signal from a controller 39. And grease pump 32
Is driven, the grease in the grease tank 33 is sucked, and the grease is discharged toward the parent distribution valve 35 described later.

Numeral 34 denotes a grease supply mechanism as a lubricating oil supply means for supplying grease discharged from the grease pump 32 to each of the greasing units 21A to 21L. 36A, 36
B, child distribution valves 37A and 37B, distribution pipes 38A to 38L
And so on.

Reference numeral 35 denotes a parent distribution valve connected to the discharge side of the grease pump 32. The parent distribution valve 35 is connected to two child distribution valves 37A and 37B through distribution pipes 36A and 36B.
B, and connected to the greasing units 21A and 21B through distribution pipes 38A and 38B. The parent distribution valve 35 supplies the grease discharged from the grease pump 32 to the two child distribution valves 37A and 37B sequentially through the distribution pipes 36A and 36B, and also distributes the grease to the distribution pipe 38.
Grease is supplied to the greasing units 21A and 21B through A and 38B. Here, the parent distribution valve 35 forms a single discharge cycle by sequentially discharging grease to the child distribution valves 37A and 37B and the greasing units 21A and 21B for a certain period of time. Repeat several times.

37A and 37B are two child distribution valves. The child distribution valves 37A and 37B are attached to the upper swing body 4 and the boom 8, respectively, and are connected to the parent distribution valve 35 through distribution pipes 36A and 36B. I have.

Here, the child distribution valve 37A is connected to a distribution pipe 38.
Boom 8 through C, 38D, 38E, 38F, 38G
Lubrication units 21C, 21D, 21 located near the base end side of
E, 21F, and 21G. The child distribution valve 37B is connected to the greasing unit 21H, which is located near the base end side of the arm 9, through distribution pipes 38H, 38J, 38K, and 38L.
21J, 21K, and 21L.

The child distribution valves 37A and 37B are
Lubrication units 21C to 21L through distribution pipes 38C to 38L
To supply grease sequentially. Thus, the child distribution valve 37A supplies oil to the boom 8, and the child distribution valve 37B supplies oil to the arm 9.

Numeral 39 denotes a controller constituted by a microcomputer or the like.
As shown in FIG. 4, the stroke sensors 18 to 2 are provided on the input side.
0 is connected, and the grease pump 32 is connected to the output side. Further, the storage device 39A of the controller 39 stores the programs and the like shown in FIG. 5 and the predetermined stroke amounts Xa0, Xa that require lubrication by a bearing device or the like.
b0 and Xc0 are stored.

Here, the predetermined stroke amount Xa0 is used to determine whether or not the lubrication units 21A to 21G near the boom 8 need lubricating oil by extending and contracting the boom cylinder 11. It is a threshold value shown.

The predetermined stroke amount Xb0 indicates whether or not the lubrication units 21H, 21J, and 21L near the arm 9 need lubricating oil by extending and contracting the arm cylinder 12. Is a threshold value.

The predetermined stroke amount Xc0 is a threshold value indicating whether or not the greasing unit 21K near the bucket cylinder 13 needs lubricating oil by extending and contracting the bucket cylinder 13. It is.

The automatic greasing device 31 according to the present embodiment has the above-described configuration. Next, the automatic greasing control process by the controller 39 will be described with reference to FIG.

First, in step 1, the stroke amounts ΔXa, ΔX detected by the stroke sensors 18 to 20 are set.
b and ΔXc are read. Next, in step 2, the absolute values of the read stroke amounts ΔXa, ΔXb, ΔXc are integrated, and the integrated stroke amounts Xa, Xb, Xc are calculated by the following equation (1).
And the integrated stroke amount Xa
, Xb, Xc are stored in the storage device 39A.

[0046]

(Equation 1)

Then, in step 3, it is determined whether or not the stored integrated stroke amount Xa has exceeded a predetermined stroke amount Xa0 that requires lubrication of a bearing device or the like near the boom 8, and in step 3, "NO" is determined. ", The process proceeds to step 4.

In step 4, it is determined whether or not the stored integrated stroke amount Xb has exceeded a predetermined stroke amount Xb0 required to lubricate a bearing device or the like near the arm 9, and in step 4, "NO"", The process proceeds to step 5.

Further, in step 5, it is determined whether or not the stored integrated stroke amount Xc has exceeded a predetermined stroke amount Xc0 that requires lubrication to a bearing device or the like near the bucket cylinder 13. If the determination is “NO”, the process returns to step 1 and the processes after step 1 are repeated.

On the other hand, if "YES" is determined in any one of the steps 3, 4, and 5, the grease is consumed in the bearing device such as the boom 8, the arm 9, and the oil film is broken. Step 6 because there is a possibility
Move on to Then, in step 6, the grease pump 32
Is driven to supply grease to the greasing units 21A to 21L through the parent distribution valve 35 and the child distribution valves 37A and 37B.

Further, in step 7, the integrated stroke amounts Xa, Xb, Xc are set to zero, and the process returns in step 8.

As described above, in the present embodiment, the stroke sensors 18 to 20 are provided for the cylinders 11 to 13 serving as actuators, respectively.
8-20, the stroke amount Δ of the cylinders 11-13
Xa to ΔXc are detected. And the controller 39
Is the stroke amount Δ by the stroke sensors 18 to 20
Xa to ΔXc are read, and the stroke amount ΔXa
Calculate the integrated stroke amounts Xa to Xc obtained by integrating .DELTA.Xc. When any one of the integrated stroke amounts Xa to Xc exceeds a predetermined stroke amount Xa0 to Xc0 that requires lubrication, the controller 39 determines that lubrication is necessary for any of the bearing devices. Thus, the grease pump 32 is driven to automatically lubricate the bearing device and the like.

Thus, in the present embodiment, the integrated stroke amounts Xa to Xc are calculated using the stroke amounts ΔXa to ΔXc of the cylinders 11 to 13 and the integrated stroke amounts Xa to Xc are used in a bearing device or the like. It is determined whether or not lubrication is required, and the lubrication is performed.
Seizure of up to 21 liters and the like can be prevented, and the life of the working device 7 of the excavator 1 can be extended.

Therefore, as described in the prior art, it is possible to prevent unnecessary lubrication, such as grease lubrication, even though the bearing device or the like has no oil film shortage. Further, in the present embodiment, the grease supply timing is determined by using the stroke amounts ΔXa to ΔXc of the cylinders 11 to 13 to supply the grease, so that the grease can be used effectively. The running cost can be reduced by reducing the amount of the grease used.

Further, it is determined whether or not lubrication is required in the bearing device or the like using the existing stroke sensors 18 to 20 provided in advance in the hydraulic excavator 1. It can be used for two kinds of control, that is, attitude control. For this reason, in the present embodiment, it is not necessary to separately provide a sensor used only for determining whether or not the oil film has run out in the bearing device or the like unlike the related art, and the manufacturing cost of the hydraulic shovel 1 can be reduced. Can be.

Next, FIG. 6 shows a second embodiment according to the present invention. The feature of this embodiment is that the rotation angles α, β, γ of the boom 8, the arm 9, and the bucket 10 are used as drive amount detecting means.
Are used. Here, in the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Here, the potentiometer 4 for the boom 8
Reference numeral 1 is provided in a bearing device that connects the base end side of the boom 8 and the upper swing body 4 with a pin, and outputs a signal corresponding to a change amount Δα of the rotation angle α of the boom 8 as a drive amount.

The potentiometer 42 for the arm 9
Is provided in a bearing device that connects the distal end side of the boom 8 and the base end side of the arm 9 with a pin, and outputs a signal corresponding to a change amount Δβ of the rotation angle β of the arm 9 as a drive amount.

Further, the potentiometer 43 for the bucket 10 is provided in a bearing device for connecting the tip end of the arm 9 and the bracket of the bucket 10 with a pin. The corresponding signal is output.

The potentiometers 41 to 43 are connected to the controller 39. For this reason, the controller 39 determines whether or not lubrication is necessary based on whether or not a value obtained by integrating the change amounts △ α to △ γ from the potentiometers 41 to 43 has reached a predetermined rotation angle.

Thus, in this embodiment, substantially the same operation and effect as those of the first embodiment can be obtained.

FIGS. 7 to 10 show a third embodiment according to the present invention. The feature of this embodiment is that the stroke amounts {Xa, △} from the stroke sensors 18 and 19 are different.
Xb is used to calculate the integrated stroke amounts Xa, Xb, and when the integrated stroke amounts Xa, Xb exceed a predetermined stroke amount, greasing is performed in individual portions. Note that, in the present embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof is omitted.

Reference numeral 51 denotes an automatic greasing device according to the present embodiment. The automatic greasing device 51 is similar to the automatic greasing device 31 described in the first embodiment.
19, grease pump 32, parent distribution 35, child distribution 3
7A and 37B, and a controller 52 to be described later.

Reference numeral 52 denotes a controller according to the present embodiment. The controller 52 has stroke sensors 18 and 19 connected to the input side and a grease pump 32 to the output side.
And the electromagnetic on-off valves 53A, 53B are connected respectively.

The storage device 52A of the controller 52
8 to 10 are stored, and predetermined stroke amounts Xa0 and Xb0 that require lubrication by the bearing device and the like, and are predetermined in the greasing units 21C to 21G and 21H to 21L. The counter values Ta0 and Tb0 for performing greasing over the greasing time are stored.

The on-off valve 53A is provided with a parent distribution component 35.
It is connected in the middle of distribution pipe 36A which connects the sub distribution part 37A. Further, the on-off valve 53B is provided with a parent distribution component 35.
It is connected in the middle of a distribution pipe 36B that connects the child distribution part 37B.

Further, the on-off valves 53A and 53B receive a control signal from the controller 52, and
Is supplied to the child distribution components 37A and 37B, respectively. That is, when the opening / closing valve 53A is opened by the control signal, the grease is not
Greasing unit 21C-2 located near boom 8 through 7A
Lubricated to 1G. When the on-off valve 53B is opened by the control signal, the grease is supplied to the greasing units 21H to 21L located near the arm 9 via the child distribution part 37B.

The automatic greasing device 51 according to the present embodiment
8 to 10 having the above-described configuration.
The automatic greasing control process according to the present embodiment will be described based on FIG.

FIG. 8 is a main routine of the present process.
The main routine is operated by, for example, opening an ignition switch or the like.

Then, in step 11, the greasing judgment flags Fa and Fb are set to "0" and initialized (Fa = 0, F
b = 0), the counter Ta is set to a predetermined counter value Ta0, and the counter Tb is set to a predetermined counter value Tb0.

Next, in step 12, the stroke amounts {Xa,} detected by the stroke sensors 18 and 19 are determined.
Read Xb. In step 13, the same calculation as in equation 1 is performed to calculate the integrated stroke amounts Xa and Xb, and the integrated stroke amounts Xa and Xb are stored in the storage device 5.
Store in 2A.

Next, at step 14, it is determined whether or not the stored integrated stroke amount Xa has exceeded a predetermined stroke amount Xa0 at which grease needs to be supplied to a bearing device or the like near the boom 8 and at step 14, " If "YES" is determined,
Move to step 15.

When it is determined "YES" in step 14, the greasing section 21C to 21G near the boom 8 needs greasing, and in step 15, the greasing determination flag Fa is set to "1". Set to. Further, the integrated stroke amount Xa is set to “0” and initialized, and
Move on to

If the determination in step 14 is "NO", the flow proceeds to step 16 because the greasing units 21C to 21G in the vicinity of the boom 8 do not need greasing.

Next, at step 16, it is determined whether or not the stored integrated stroke amount Xb has exceeded a predetermined stroke amount Xb0 at which lubrication is required for a bearing device or the like near the arm 9 or not. If "YES" is determined,
Move to step 17.

If it is determined “YES” in step 16, it is necessary to supply greasing to the greasing units 21 H to 21 L in the vicinity of the arm 9. Therefore, in step 17, the greasing determination flag Fb is set to “1”. Set to. Further, the integrated stroke amount Xb is set to “0” and initialized, and
Move on to

On the other hand, if "NO" is determined in the step 16, the greasing unit 21H to 21L in the vicinity of the arm 9 does not need the greasing, so the process proceeds to the step 18.

Then, in step 18, a lubrication process for the boom section described later is performed, the on-off valve 53 A is opened and closed, and the routine proceeds to step 19. Further, in step 19, a lubrication process for the arm portion, which will be described later, is performed, the open / close valve 53 </ b> B is opened and closed, and the process proceeds to step 20.

Next, at step 20, it is determined whether or not the greasing determination flag Fa is "1". When the greasing determination flag Fa is "1", it is determined to be "YES". When it is determined "YES" in step 20, the boom 8
Since the greasing is performed to the nearby greasing units 21C to 21G, the process proceeds to step 23, and the grease pump 32 is driven.
The process again proceeds to step 12, and the processes after step 12 are repeated.

If the determination in step 20 is "NO", the process proceeds to step 21 and the greasing determination flag F
It is determined whether or not b is “1”. Then, when it is determined “YES” in step 21, the greasing is performed to the greasing units 21 </ b> H to 21 </ b> L in the vicinity of the arm 9, and the process proceeds to step 23 to drive the grease pump 32, and again proceeds to step 12. The processing after step 12 is repeated.

If "NO" is determined in the step 21, since the greasing is not performed, the process proceeds to the step 22, the grease pump 32 is stopped, the process returns to the step 12, and the processes after the step 12 are repeated. .

Next, the lubrication process for the boom section will be described with reference to a subroutine shown in FIG.

First, at step 31, it is determined whether or not the greasing determination flag Fa is "1". When the greasing determination flag Fa is "1", it is determined to be "YES". When it is determined “YES” in step 31, the boom 8
Since greasing is performed to the nearby greasing units 21C to 21G, the process proceeds to step 32 to open the on-off valve 53A, and proceeds to step 33 to decrement the counter Ta by "1".

Next, at step 34, it is determined whether or not the counter Ta is "0". When the counter Ta is "0", "YES" is determined. When it is determined “YES” in step 34, the greasing time has elapsed and the required amount of grease has been supplied to the greasing units 21C to 21G. In step 35, the greasing determination flag Fa is set to "0". In step 35, the counter Ta is set to the counter value Ta0 again, and in step 3
It moves to 7 and returns.

If it is determined "NO" in step S34, it means that the greasing is being performed to the greasing units 21C to 21G, and the process returns to step S37.

On the other hand, if "NO" is determined in step 31, the greasing section 21C to 21G in the vicinity of the boom 8 does not need to be greased.
3A is closed, and the process proceeds to step 37 and returns.

Next, a subroutine shown in FIG.
The lubrication process of the arm will be described.

First, at step 41, it is determined whether or not the greasing determination flag Fb is "1". When the greasing determination flag Fb is "1", it is determined to be "YES". When it is determined “YES” in step 41, the arm 9
Since lubrication is performed to the neighboring greasing units 21H to 21L, the process proceeds to step 42 to open the on-off valve 53B, and proceeds to step 43 to decrement the counter Tb by "1".

Next, at step 44, it is determined whether or not the counter Tb is "0". When the counter Tb is "0", it is determined as "YES". Then, when it is determined to be “YES” in step 44, since the greasing time has elapsed and the necessary amount of grease has been supplied to the greasing units 21H to 21L, the greasing to the greasing units 21H to 21L is performed. In step 45, the greasing determination flag Fb is set to "0". In step 45, the counter Tb is set to the counter value Tb0 again.
It moves to 7 and returns.

When the determination at step 44 is "NO", the process proceeds to step 47 and returns because the greasing is being performed to the greasing units 21H to 21L.

On the other hand, if "NO" is determined in the step 41, there is no need to supply the greasing parts 21H to 21L near the arm 9, so that the routine proceeds to a step 46, where the on-off valve 5
3B is closed, and the routine proceeds to step 47 and returns.

Thus, in the present embodiment, substantially the same operation and effect as those of the first embodiment can be obtained. However, in the automatic greasing device 51 according to the present embodiment, before the bearing device of the boom 8 and the arm 9 becomes insufficient in grease,
Automatic lubrication can be performed by setting the lubrication timing in each part. Therefore, as in the first embodiment,
It is possible to perform greasing for each of the greasing units 21A to 21L distributed by the child distribution parts 37A and 37B without greasing all the greasing units 21A to 21L at the time of greasing, greatly reducing waste of grease. Can be eliminated.

In the third embodiment, the lubricating units 21A to 21L are provided on the bearing devices near the boom 8 and the arm 9; however, a bearing device for connecting the bucket 10 and the arm 9 with a pin is used. It is good also as a structure provided with a greasing part.

As shown by the phantom line in FIG. 7, a child distribution part 62 is connected to the parent distribution part 35 through a distribution pipe 61, and lubrication is supplied to the bearing device near the bucket 10 through the child distribution part 62. It is good also as a structure which performs.

At this time, in the middle of the distribution pipe 61, the third
It is preferable that the on-off valve 63 similar to the on-off valves 53A and 53B according to the embodiment be mounted. And
In substantially the same manner as the lubrication process of the boom portion shown in FIG. 9, the on-off valve 63 is opened and closed using the stroke amount ΔXc detected by the stroke sensor 20 for the bucket 10.

The potentiometers 41 to 43 according to the second embodiment may be used in place of the stroke sensors 18 to 20 according to the third embodiment.

Step 2 in FIG. 5 and Step 13 in FIG. 8 are specific examples of the driving amount integrating means. Steps 3 to 7 in FIG. 5 and Steps 14 to 23 in FIG. It is a specific example of the means.

The parent distribution 3 according to each of the above-described embodiments is also used.
5 is a distribution pipe 36A, 36B, 38A, 38B, 61
The supply amount of grease may be configured to be different for each grease, and more grease may be supplied to the grease supply unit where the oil curtain is likely to be cut off as compared with other grease supply units. Similarly, the child distribution components 37A, 37B,
62 may be configured such that the supply amount of grease is different for each of the distribution pipes 38C to 38L.

Furthermore, the construction machine according to the present invention has been described by taking a hydraulic excavator as an example. However, the present invention is not limited to this, and may be applied to construction machines such as a hydraulic crane, a wheel loader, and a bulldozer.

[0100]

As described above in detail, according to the first aspect of the present invention, the integrated drive amount is calculated using the drive amount of the actuator, and the greasing at the greasing portion is performed using the integrated drive amount. Since it is determined whether or not it is necessary and the lubrication is performed, it is possible to prevent the oil film from being cut off, seizure and pin galling at the lubrication site, and to extend the life of the working device of the construction machine. Further, since lubrication is performed only when lubrication is required at the lubrication site, the amount of lubricating oil used can be reduced, and running costs can be reduced.

Further, since the driving amount detecting means for detecting the driving amount of the actuator is used, an existing sensor or the like used for controlling the posture of the working device can be used as the driving amount detecting means. For this reason, the drive amount detecting means can be used for the two controls of the greasing control and the attitude control, and there is no need to separately provide a sensor used only for determining whether or not the oil film has run out. Manufacturing costs can be reduced.

According to the second aspect of the present invention, the construction machine is a hydraulic shovel including a working device including a boom, an arm, and a bucket, and the drive amount detecting means detects movement of the boom, the arm, and the bucket. Since the direct detection is employed, the posture of the working device can be detected by the drive amount detection means, and it can be determined whether or not the greasing portion needs greasing. For this reason, an existing sensor or the like used for the posture control of the working device can be used as the drive amount detecting means, and the manufacturing cost of the construction machine can be reduced.

According to the third aspect of the present invention, since the stroke sensors provided in the respective cylinders are used as the drive amount detecting means, the lubrication of lubricating oil is necessary by using the stroke amount of the stroke sensor. Can be determined, and the posture of the working device can be controlled.

According to the fourth aspect of the present invention, since the potentiometer for detecting the rotation angles of the boom, the arm, and the bucket is used as the drive amount detection means, the amount of change in the rotation angle output from the potentiometer is used. By
It is possible to determine whether or not lubrication of the lubricating oil is necessary, and to control the posture of the working device.

[Brief description of the drawings]

FIG. 1 is an external view showing a hydraulic excavator according to a first embodiment of the present invention.

FIG. 2 is an overall configuration diagram showing an automatic greasing device according to the first embodiment.

FIG. 3 is a longitudinal sectional view showing a hydraulic cylinder according to the first embodiment.

FIG. 4 is a control block diagram illustrating a controller and the like of the automatic greasing device according to the first embodiment.

FIG. 5 is a flowchart showing an automatic greasing control process according to the first embodiment.

FIG. 6 is a control block diagram showing a controller and the like of an automatic greasing device according to a second embodiment.

FIG. 7 is a control block diagram illustrating a controller and the like of an automatic greasing device according to a third embodiment.

FIG. 8 is a flowchart showing an automatic greasing control process according to a third embodiment.

FIG. 9 is a flowchart showing a greasing process of the boom part in FIG.

FIG. 10 is a flowchart showing a greasing process of the arm unit in FIG. 8;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Hydraulic excavator (construction machine) 7 Working device 11 Boom cylinder 12 Arm cylinder 13 Bucket cylinder 18, 19, 20 Stroke sensor 21A, 21B, 21C, 21D, 21E, 21F, 2
1G, 21H, 21J, 21K, 21L Greasing part 31, 51 Automatic greasing device 32 Grease pump (pump means) 33 Grease tank 34 Grease supply mechanism (lubricating oil supply means) 35 Parent distribution valve 36A, 36B, 61 Distribution pipe 37A, 37B, 62 Child distribution valve 39, 52 Controller 41, 42, 43 Potentiometer

Claims (4)

[Claims] 1. A pump provided in a construction machine having a working device driven by an actuator for discharging lubricating oil, and lubricating oil supplied from the pumping device to a greasing portion of the working device. An automatic lubrication device for a construction machine, comprising: an oil supply unit; and a lubrication oil supply control unit that controls supply of lubrication oil by the lubrication oil supply unit. The lubrication oil supply control unit detects a driving amount of an actuator. Driving amount detecting means, driving amount integrating means for integrating the driving amount detected by the driving amount detecting means, and the integrated driving amount calculated by the driving amount integrating means requires greasing at the greasing portion. Grease supply means for driving the pump means when a predetermined drive amount is exceeded to supply grease from the lubricating oil supply means to a grease supply site. Location. 2. The construction machine includes a boom driven by a boom cylinder rotatably provided on a vehicle body, an arm provided on a tip side of the boom and rotated by an arm cylinder, and a boom cylinder provided on a tip side of the arm. 2. The hydraulic shovel provided with a working device including a bucket provided and a bucket rotated by a bucket cylinder, wherein the drive amount detection unit is configured to directly detect a movement of the boom, the arm, and the bucket. 3. Automatic greasing equipment for construction machinery. 3. The drive amount detection means is provided in the boom cylinder, the arm cylinder, and the bucket cylinder,
The automatic lubrication device for a construction machine according to claim 2, comprising a stroke sensor that detects a stroke amount as a drive amount. 4. The automatic lubrication device for a construction machine according to claim 2, wherein said drive amount detection means comprises a potentiometer for detecting a rotation angle of said boom, arm, and bucket as a drive amount.