JP2011162944A - Method and device for controlling lubrication of sliding bearing of construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device for controlling the lubrication of sliding bearings which can automatically improve the state of the lubrication of the bearings and extend the life of the components of the bearing parts in a construction machine in which lubrication is intermittently performed to the sliding bearings installed at the joint parts of a multi-joint front part of the construction machine. <P>SOLUTION: The temperatures of the sliding bearings are detected, and the detected temperatures are compared with a pre-set reference temperature. When either of the detected temperatures is higher than the reference temperature, the frequency of lubrication to the corresponding sliding bearing is increased. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method and an apparatus for managing grease supply to a slide bearing provided at a joint portion or the like of a work attachment in a construction machine such as a hydraulic excavator.

  In a construction machine including a work attachment having a joint portion such as a hydraulic excavator, a slide bearing is provided at the joint portion. Among construction machines having such a sliding bearing, a large-scale construction machine is provided with a device that supplies grease through a grease supply pipe by a grease supply pump to the sliding bearing provided in each joint portion (for example, Patent Documents). 1).

  In such a sliding bearing, if the construction machine continues to operate without good lubrication due to grease, the pin or bushing, which is a component of the bearing, may become galling or cause uneven wear. Will be forced to replace. Such a replacement operation of the pins and bushes takes a long time and greatly reduces the operating rate of the construction machine.

  For this reason, in the past, in order to check whether the lubrication condition is smooth without any galling or uneven wear, it is confirmed visually whether grease has reached the bearings, and whether the grease supply piping is damaged. It is checked by visual inspection and whether or not a galling noise is generated in the bearing when the work attachment is moved.

JP 2008-106620 A

  However, in order to confirm the supply status of grease by visual observation or sound, it is necessary to provide time for stopping and checking the operation of the construction machine, which reduces the operation rate of the construction machine. In particular, in a large hydraulic excavator that operates for 24 hours for resource excavation or the like, it is difficult to stop the operation of the construction machine because the operation rate is lowered.

  In addition, it is difficult to directly confirm the amount of wear of the pins and bushes of the bearing by visual observation. In addition, when the grease supply pipe is visually inspected, even if the grease is leaked, the leak cannot be confirmed unless the grease supply pipe is washed cleanly, and the inspection takes time and effort.

  As described above, since it is difficult or difficult to check the lubrication state by visual observation, this poor lubrication state tends to be left unattended. However, if the state of poor lubrication is left unattended, the amount of wear of the bearing portion increases and rattling occurs, leading to the problem of shortening the life of the pins and bushes that are constituent members of the bearing portion.

  In view of the above-described problems, the present invention provides a construction machine that can automatically improve the lubrication state, prevent the progress of wear of the members constituting the bearing portion, and extend the life of the constituent members of the bearing portion. It is an object of the present invention to provide a sliding bearing lubrication management method and apparatus. Another object of the present invention is to provide a sliding bearing greasing management device capable of reliably detecting the lubrication status of the bearing during operation of the construction machine.

The sliding bearing lubrication management method for a construction machine according to claim 1 is a sliding bearing lubrication management method for a construction machine in which grease is intermittently lubricated to a sliding bearing provided at a joint portion of a multi-joint front of the construction machine by a grease pump.
Detecting the temperature of the plain bearing,
Compare the detected temperature of the plain bearing with a preset reference temperature,
When the detected temperature is higher than the reference temperature, the lubrication frequency of the slide bearing is increased.

The sliding bearing lubrication management device for a construction machine according to claim 2 is a sliding bearing lubrication management device for a construction machine that intermittently lubricates a sliding bearing provided at a joint portion of a multi-joint front of the construction machine.
A temperature sensor for detecting the temperature of the plain bearing;
Temperature comparison means for comparing the temperature detected by the temperature sensor with a preset reference temperature;
The temperature comparison means includes a lubrication frequency changing means for increasing the lubrication frequency of the slide bearing when it is determined that the detected temperature is equal to or higher than the reference temperature.

The sliding bearing lubrication management device for a construction machine according to claim 3 is the sliding bearing lubrication management device for a construction machine according to claim 2,
A temperature display means for displaying the detected temperature is further provided.

The sliding bearing greasing management device for a construction machine according to claim 4 is the sliding bearing greasing management device for a construction machine according to claim 2 or 3,
High temperature notification means for notifying that the detected temperature is high when the detected temperature is equal to or higher than the reference temperature is further provided.

The sliding bearing greasing management device for a construction machine according to claim 5 is the sliding bearing greasing management device for a construction machine according to any one of claims 2 to 4,
It is characterized by further comprising a lubrication abnormality alarm means for issuing an alarm when the bearing temperature remains at a high temperature even when the greasing time interval is shortened.

According to the first and second aspects of the invention, based on an empirical rule that a poor lubrication condition leads to an increase in bearing temperature, the bearing condition is detected to determine the lubrication condition. Is improved to improve the lubrication status, the bearing is not left in a poor lubrication status, and the lubrication status is automatically improved. For this reason, progress of wear of the members constituting the bearing portion can be prevented, and the life extension of the constituent members of the bearing portion can be achieved. Further, since the lubrication status of the bearing can be detected during operation of the construction machine without stopping the construction machine, it is possible to avoid a decrease in the operating rate of the construction machine due to the lubrication status inspection.
According to the third aspect of the present invention, since the detected bearing temperature is displayed by the temperature display means, it is possible to reliably detect the lubrication state of the bearing as compared with visual confirmation or sound confirmation.
According to the invention of claim 4, when the detected temperature of the bearing is higher than a preset reference temperature, the operator is provided with a high temperature notification means for indicating that the temperature is high, so that the operator preferably has a lubrication condition of the bearing. You can know that there is no.
According to the invention of claim 5, when the state in which the detected temperature of the bearing is higher than the reference temperature continues even though the lubrication frequency is increased, the lubrication abnormality alarm means for informing that the lubrication condition is abnormal. Thus, the operator can take appropriate measures without overlooking this abnormality.

It is a side view showing an example of a hydraulic excavator which is a kind of construction machine to which the present invention is applied. It is a side view which shows an example of the bearing part which implements the sliding bearing greasing management method by this invention. It is a block diagram which shows one Embodiment of the apparatus which implements the sliding bearing greasing management method by this invention. It is a figure which shows an example of the relationship between the operation amount of the operation lever of the articulated front of a construction machine, and the temperature of a slide bearing. It is a functional block diagram which shows one Embodiment of the apparatus which implements the sliding bearing greasing management method by this invention. 6 is a flowchart for explaining a processing example of the apparatus in FIG. 5. 6 is a graph for explaining a processing example of the apparatus in FIG. 5. 6 is a flowchart for explaining another example of processing of the apparatus in FIG. 5.

  FIG. 1 is a side view showing an example of a hydraulic excavator which is a kind of construction machine to which the present invention is applied. In FIG. 1, 1 is a lower traveling body, 2 is an upper revolving body installed on the lower traveling body 1 via a revolving device 3, 4 is a hydraulic power unit mounted on the upper revolving body 2, and 5 is a cab. Is a multi-joint work attachment attached to the upper swing body 2.

  The working attachment 7 in this example includes a boom 10 attached to the upper swing body 2 so as to be able to be lifted by a boom cylinder 9 with a pin 8 as a center, and an arm cylinder 12 with a pin 11 as a center. The arm 13 is movably attached, and a bucket 19 is pivotally attached to the tip of the arm 13 by a bucket cylinder 15 and links 16 and 17 around a pin 14. Reference numerals 20 and 21 denote pins for connecting the both ends of the boom cylinder 9 to the upper swing body 2 and the boom 10, respectively. Reference numerals 22 and 23 denote a bracket 24 provided to the boom 10 for both ends of the arm cylinder 12 and a bracket 25 provided to the arm 13, respectively. 27 is a pin for connecting the bucket cylinder 15 to the bracket 25, 28 is a pin for connecting the bucket cylinder 15 to one end of the links 16 and 17, 29 and 30 are arms for the other ends of the links 16 and 17, respectively. 13 is a pin connected to the bucket 19.

  FIG. 2 is a side view showing a mounting portion of the boom 10 with respect to the upper swing body 2 and is shown as an example of a bearing portion to which the grease supply device of the present invention is applied. In FIG. 2, 2a is a bracket for attaching a work attachment provided on the upper swing body 2, 2b is a boss provided on the bracket 2a for attaching the pin 8, and 10a is a boss on the boom 10 side. 43 is a cover provided by bolts 44 at both ends of the pin 8 as will be described later, and 51a to 51c are cables for transmitting signals of temperature sensors 50a to 50c described later to the controller 61 (see FIG. 3).

  The greasing method and the greasing device of the present invention are applied not only to the pin 8 for attaching the boom 10 but also to the bearing portion of the pin 11 for attaching the arm 13 to the boom 10 and the pin 14 for attaching the bucket 19 to the arm 13. . Further, the present invention can be applied to the bearing portions of the pins 20 to 23, 27, and 28 for attaching the hydraulic cylinders 9, 12, and 15 and the pins 29 and 30 for attaching the links 16 and 17 as necessary.

  FIG. 3 is a block diagram showing an embodiment of a grease supply device for a bearing portion according to the present invention. As shown in FIG. 3, 33 and 45 are bushes made of porous metal that are fitted into the boom-side boss 10a and the upper revolving unit 2-side boss 2b, respectively, and impregnate with grease. The pin 8 is rotatably inserted into these bushes 33 and 45. The bush 33 constitutes a bearing portion on the boss 10a side, and the bush 45 constitutes a bearing portion on the boss 2b side. Reference numeral 36 denotes a sealing material provided for sealing a gap between the boss 2b and the boss 10a.

  37 is a greasing port provided through the boss 10a and the bush 33 in the radial direction, 38 is a greasing hole provided over the entire length in the axial direction inside the pin 8, 39 is also penetrated through the pin 8 in the radial direction, A grease supply hole 40 provided in communication with the grease supply hole 38 is a grease supply groove provided in the longitudinal direction of the pin 8 on the outer periphery of the portion of the pin 8 fitted into the bush 33. 41a and 41b are greasing grooves provided in the longitudinal direction of the pin 8 on the outer periphery of the portion fitted into the bosses 2b and 2b at both ends of the pin 8.

  Reference numeral 43 denotes a lid that covers both ends of the pin 8. Reference numeral 44 denotes a bolt for fixing the lid 43 to the boss 2b. Reference numeral 47 denotes a greasing port provided on the lid 43, which lubricates between the gap 48 inside the lid 43 and the bush 45 and the pin 8. 50a is a temperature sensor provided on the boss 10a to detect the temperature of the bearing, and 50b and 50c are temperature sensors similarly provided on the bosses 2b and 2b. The reason why the temperature sensors 50a, 50b, and 50c are provided on the boss 10a on the boom 10 side and the bosses 2b and 2b provided on the brackets 2a and 2a on both sides, respectively, is that the pin 8 of this embodiment uses these bosses. Because the pin 8 can rotate with respect to 10a, 2b and 2b, there is a possibility that lubrication abnormality may occur in each part of the bosses 10a, 2b and 2b, and the temperatures may be different. is there.

  A grease tank 52 stores grease, and a grease pump 53 supplies the grease in the grease tank 52 to the bearings through the grease supply pipes 54a, 54b, 54c. Reference numeral 55 denotes a motor for driving the grease pump 53. In this example, a hydraulic motor is used as the motor, but an electric motor may be used. Reference numeral 57 denotes a hydraulic pump driven by the engine 58, and 59 denotes a hydraulic oil tank that stores hydraulic oil discharged from the hydraulic pump 57. Reference numeral 60 denotes an electromagnetic valve that controls supply and stop of hydraulic oil discharged from the hydraulic pump 57 to the hydraulic motor 55, and reference numeral 60a denotes a solenoid thereof.

  61 is a controller including an arithmetic processing unit for controlling the electromagnetic valve 60 and the like, and 62 is a monitor for displaying a lubrication state of the bearing by grease as will be described later. Reference numeral 63 denotes an operation lever for operating the boom 10. By operating this operation lever, a boom cylinder 9 control valve (not shown) is switched, and hydraulic oil is supplied from the hydraulic pump to the boom cylinder 9. Control. Thereby, the boom cylinder 9 is expanded and contracted to raise and lower the boom 10. The operation information of the operation lever 63 and the detection signals of the temperature sensors 50a to 50c are input to the controller 61 via signal lines 56 and 51a to 51c, respectively.

  In the apparatus shown in FIG. 3, when the electromagnetic valve 60 is in the illustrated position (lower position), hydraulic oil is not supplied to the hydraulic motor 55, the greasing pump 53 is in a stopped state, and the bearing portion is lubricated. I can't. When an operation current flows from the controller 61 to the solenoid 60a of the electromagnetic valve 60, the electromagnetic valve 60 is switched to the upper position. For this reason, the hydraulic oil discharged from the hydraulic pump 57 is supplied to the hydraulic motor 55, and the hydraulic motor 55 operates. For this reason, the grease pump 53 is driven by the hydraulic motor 55, and the grease in the grease tank 52 is supplied between the bush 33 and the pin 8 from the grease port 37 through the grease port 40 through the grease pipes 54a and 54b. Is done.

  Further, the grease discharged from the grease pump 53 is also supplied to the gap 48 between the end portion of the pin 8 and one cover 43 through the grease supply pipes 54 a and 54 c. The grease supplied to the gap 48 between the one cover 43 and the end of the pin 8 is supplied to the greasing groove 41a on the one cover 43 side through the greasing holes 38 and 39, and one boss. It is supplied between the bush 45 and the pin 8 in 2b. Further, the grease supplied to the gap 48 between the one cover 43 and the pin 8 is supplied to the gap 48 between the cover 43 and the pin 8 on the other cover 43 side through the greasing hole 38, and the other through the greasing groove 41b. Is supplied between the bush 45 and the pin 8 in the boss 2b.

  The lubrication by switching the electromagnetic valve 60 is performed intermittently at a constant time interval preset by the controller 61. This time interval is set to about 8 to 60 minutes when the temperature of the bearing portion is below a reference temperature described later. In the present invention, as will be described later, the time interval for greasing is changed according to the lubrication condition of the bearing.

  Note that grease is also supplied from one greasing pump 53 through a manifold to the bearing portion of the pin 11 that attaches the arm 13 to the boom 10 and the bearing portion of the pin 14 that attaches the bucket 19 to the arm 13.

  FIG. 4 is a graph showing an example of the operation amount and the bearing temperature change in the boom raising / lowering operation. Here, the operation amount is displayed as a voltage when the operation lever 63 is an electric lever. For example, the operation amount 0 (neutral position) is 2.5 V and 100% (boom raising full operation) is 4. .5V, -100% (boom lowering full operation) appears as 0.5V. When the operation lever is hydraulically operated, the operation amount is displayed as a pressure, and the operation pressure is converted into an electric signal and input to the controller 61. As shown in FIG. 4, when there is an abnormality such as galling in the bearing portion, the degree of increase in the bearing temperature becomes more rapid than when there is no abnormality.

  FIG. 5 is a functional block diagram of a device for managing the lubrication of the bearing in this embodiment, which is realized by a signal conversion device, an arithmetic device, etc. attached to the controller 61. In FIG. 5, when an electric lever is used as the operation lever 63, the operation information detection means 65 has an operation amount of the operation lever 63 equal to or greater than a threshold value (for example, 50% or more for boom raising, for example- 50% or less), it is detected that the operation lever 63 is operated.

  The reference temperature setting unit 66 sets a reference temperature that is a threshold value for changing the greasing time interval, and is realized by a keyboard, a switch, or the like. In this embodiment, as the reference temperature, two types of reference temperatures T0 and T1 are set as described later.

  The temperature display means 67 causes the monitor 62 to display the bearing temperature detected by the temperature sensors 50a to 50c. The temperature comparison means 69 compares the bearing temperature T with a higher reference temperature T0 (for example, 100 ° C.) and a lower reference temperature T1 (for example, 60 ° C.) when the grease is supplied at normal time intervals. The high temperature notification means 70 notifies the monitor 62 that the bearing temperature is high when T ≧ T0. It should be noted that the temperature display by the temperature comparison means 67 and the high temperature notification by the high temperature notification means 70 are not always performed, but are displayed at regular intervals, or as required by operating the operating device for operator display. May be displayed on the monitor 62.

  The timer 71 sets two kinds of rest periods during the lubrication to energize the solenoid 60a of the solenoid valve 60 shown in FIG. One of them is a normal time interval t1 (for example, 15 minutes), and the other is a short time interval t2 (for example, 3 minutes). The greasing frequency changing unit 72 sets the timer 71 when the temperature comparing unit 69 determines that the bearing temperature is high (T ≧ T0) in a state where the greasing is performed at a normal time interval t1. The time is changed from the normal time t1 to the short time t2. Further, when the bearing temperature T is lower than the reference temperature T1 (for example, 60 ° C.) or lower (T ≦ T1) in the state where the lubrication is performed in the short time t2, the lubrication time interval is returned to the normal time t1.

  The lubrication abnormality determining means 74 compares the bearing temperature T with the reference temperature T0 when working at the time t2 where the greasing time interval is short, and if T ≧ T0, it determines that the lubrication abnormality is present, and the lubrication abnormality alarm Lubricating abnormality is displayed on the monitor 62 by means 76. In addition, the means for notifying that the temperature is high or the lubrication abnormality can be notified by a lamp, a sound, or the like in addition to being displayed on the display screen of the monitor 62 by characters, marks, or the like.

  FIG. 6 is a flowchart showing an example of the operation of the controller 61 of FIG. After starting the work of the construction machine, the operation information detecting means 65 of the operation lever 63 detects the operation of the operation lever 63 (step 1). When this operation is detected, the temperature comparison means 69 compares the bearing temperatures T detected by the temperature sensors 50a to 50c with the reference temperature T0 set by the reference temperature setting means 66 (step 2). ).

  If T <T0, when the high temperature display by the high temperature notification means 70 or the alarm by the lubrication abnormality alarm means 76 is issued, these displays are canceled (step 3). At this time, the setting time of the timer is set to the normal time t1 or maintained by the greasing frequency changing means 72 (step 4). Then, the time interval t1 is waited for (step 5). After the time t1, the drive circuit 77 energizes the solenoid 60a of the solenoid valve 60 shown in FIG. 3 for a predetermined time to operate the hydraulic motor 55. The hydraulic pump 53 is driven for a predetermined time to supply grease to the bearing (step 6). Then, the process returns to step 1 and waits for the operation of the operation lever 63 to be detected.

  On the other hand, if it is determined by the temperature comparison means 69 that the bearing temperature T is equal to or higher than the reference temperature T0 (T ≧ T0) (step 2), the high temperature notification means 70 displays on the monitor 62 that the temperature is high. (Step 7) If T ≧ T0, the setting time of the timer 71 is set or maintained at a time t2 shorter than the normal time t1 by the greasing frequency changing means 72 (step 8). Then, the measurement of the operation information of the operation lever 63 (step 9) starts the measurement of the elapsed time t thereafter, and energizes the solenoid 60a of the electromagnetic valve 60 shown in FIG. 3 for a predetermined time after the set time t2 of the timer 71 elapses. Then, the hydraulic motor 55 is operated, whereby the hydraulic pump 53 is driven for a predetermined time to supply grease to the bearing portion of the pin 8 (steps 10 and 11).

  Next, the bearing temperature T is compared with the higher reference temperature T0 (step 12). If T <T0, the notification by the high temperature notification means 70 is stopped (step 13). Then, the bearing temperature T is compared with the lower reference temperature T1 (step 14), and if T ≦ T1, that is, if the bearing temperature seems to have sufficiently decreased, the normal greasing time interval t1 is returned. And return to step 1. On the other hand, if T> T1, the operation returns to the operation information detection in step 9 while maintaining the greasing time interval at a short time t2.

  On the other hand, in a greasing cycle in which the greasing time interval is shortened to t2, if T ≧ T0, it is assumed that the bearing temperature T has not decreased even though the greasing time interval has been shortened to t2, and a lubrication abnormality alarm is issued. Lubricating abnormality is notified to the monitor 62 by means 76 (step 15).

  FIG. 7 is a time chart showing a processing example of this embodiment. In this time chart, the reference temperature T0 on the high side is 100 ° C., the reference temperature T1 on the low side is 60 ° C., the normal greasing time interval t1 is 15 minutes, and the short greasing time interval t2 is 3 minutes. Show about. In the time chart of FIG. 7, lines a to e indicate the bearing temperature T detected by one of the temperature sensors 50a to 50c. Among these lines a to e, a line a indicating a change in the bearing temperature T at an initial stage is a state in which the bearing temperature T is increased by repeating the greasing at a normal greasing time interval t1. Indicates. When the bearing temperature T rises and reaches a higher reference temperature T0, the greasing time interval is switched to t2, and the greasing is repeated at a short time interval t2, so that the bearing temperature T is indicated by a line c. To descend.

  When the bearing temperature T falls and becomes equal to or lower than the lower reference temperature T1, the lubrication time interval changes to the long time interval t1, so that the bearing temperature T gradually increases as shown by the line b. When the bearing temperature T becomes T0 or more again, the greasing time interval is shortened to t2 again. In the example of this time chart, the bearing temperature T decreases as indicated by the line d during the initial period when the greasing time interval is changed to t2, but thereafter, the bearing temperature T starts to increase and increases again as indicated by the line e. In this case, an alarm notifying the lubrication abnormality is issued on the monitor 62 by the lubrication abnormality alarm means 76.

  FIG. 8 is a flowchart showing another processing mode of the apparatus shown in FIG. In the example of FIG. 8, the lubrication abnormality determination means 74 presets the reference number Na in the short greasing time interval t2, and counts the number of repeated greasing N in the short greasing time interval t2 (step 13). Then, in a greasing cycle at a short greasing time interval t2, the condition that the bearing temperature T is higher than the reference temperature T1 on the lower side (step 16) is that the number of greasing N is the reference number Na for each greasing. Is monitored (step 17). When the number of times of lubrication N reaches the reference number of times Na, it is determined whether or not T ≧ T0 (step 18), and if T ≧ T0, an alarm indicating that the lubrication is abnormal is issued (step 19). Other processes are the same as those in the example of FIG. In the processing method shown in FIG. 8, the processing of steps 14 to 16 is not necessarily required. When the process of FIG. 8 is performed, the reference number Na is preferably set to about 3 to 10 times, for example, but may be set to another number.

  Thus, in the present embodiment, the bearing temperature T is detected based on the empirical rule that a poor lubrication condition leads to an increase in bearing temperature, and the lubrication condition is judged and displayed. In comparison, it is possible to reliably detect poor lubrication. Further, when the bearing temperature T is high, the grease lubrication frequency is increased to improve the lubrication condition, so that the bearing is not left in a poor lubrication condition, and the lubrication condition is automatically improved. For this reason, since it is possible to prevent the wear of the pin 8 and the bushes 33 and 45 constituting the bearing portion from progressing, it is possible to extend the life of the constituent members of the bearing portion. In addition, since the abnormality of the lubrication status of the bearing can be detected during operation of the construction machine such as a hydraulic excavator without stopping the construction machine, it is possible to avoid a decrease in the operation rate of the construction machine due to the lubrication condition inspection. .

  In the above embodiment, when the detected temperature T of the bearing is higher than the reference temperature T0, the high temperature notification means 70 for displaying this is provided, so that the operator knows when the lubrication condition is bad. Can do.

  Further, in the above-described embodiment, when the state where the detected temperature of the bearing is higher than the reference temperature continues even though the lubrication frequency is increased, the lubrication abnormality alarm means for informing that the lubrication state is abnormal. Since 76 is provided, the operator can take appropriate measures without overlooking this abnormality.

  The present invention can be applied to other construction machines to which other work tools are attached instead of buckets of hydraulic excavators, various construction machines in which the structure of the work attachment 7 is changed, and construction machines such as cranes. . Further, the present invention can be applied to bearing portions other than the work attachment 7. In the present invention, a hydraulic cylinder can be used in addition to the hydraulic pump as a drive device for supplying grease.

1: Lower traveling body, 2: Upper turning body, 3: Turning device, 4: Hydraulic power unit, 5: Driver's cab, 7: Working attachment, 8: Pin, 9: Boom cylinder, 10: Boom, 10a: Boss 11: Pin, 12: Arm cylinder, 13: Arm, 14: Pin, 15: Bucket cylinder, 16, 17: Link, 19: Bucket, 20-23: Pin, 24, 25: Bracket, 27-30: Pin, 33, 45: bush, 36: sealing material, 37, 47: greasing port, 38, 39: greasing hole, 40, 41a, 41b: greasing groove, 43: lid, 48: gap, 50a to 50c: temperature Sensors, 51a to 51c: Signal line, 52: Grease tank, 53: Grease pump, 54a to 54c: Grease piping, 55: Motor, 57: Hydraulic pump, 58: Engine, 59: Hydraulic oil tank, 6 Electromagnetic valve, 60a: solenoid, 61: controller, 62: monitor, 63: operation lever

Claims (5)

In the lubrication management method for a sliding bearing of a construction machine that intermittently lubricates the sliding bearing provided in the joint part of the multi-joint front of the construction machine,
Detecting the temperature of the plain bearing,
Compare the detected temperature of the plain bearing with a preset reference temperature,
When the detected temperature is higher than the reference temperature, the lubrication frequency of the sliding bearing is increased by increasing the lubrication frequency of the sliding bearing. In the sliding bearing lubrication management device for a construction machine that intermittently lubricates the sliding bearing provided in the joint part of the multi-joint front of the construction machine,
A temperature sensor for detecting the temperature of the plain bearing;
Temperature comparison means for comparing the temperature detected by the temperature sensor with a preset reference temperature;
A construction machine comprising: a lubrication frequency changing means for increasing the lubrication frequency of the sliding bearing when the temperature comparison means determines that the detected temperature is equal to or higher than the reference temperature. Sliding bearing lubrication management device. In the sliding bearing lubrication management device for the construction machine according to claim 2,
A sliding bearing greasing management apparatus for construction machinery, further comprising temperature display means for displaying the detected temperature. In the sliding bearing greasing management apparatus of the construction machine of Claim 2 or 3,
A sliding bearing greasing management device for construction machinery, further comprising high temperature notification means for notifying that the detected temperature is high when the detected temperature is equal to or higher than the reference temperature. In the sliding bearing greasing management apparatus of the construction machine of any one of Claim 2 to 4,
A sliding bearing lubrication management device for a construction machine, further comprising a lubrication abnormality alarm means for issuing an alarm when the bearing temperature remains at a high temperature even when the lubrication time interval is shortened.

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