JPH08333777A - Performance limit display device for hydraulic equipment in construction machine - Google Patents

Abstract

PURPOSE: To compute damage of hydraulic equipment in a construction machine, and automatically diagnose and display the performance limit of the hydraulic equipment. CONSTITUTION: Pressure detecting parts 11, 11... are provided every hydraulic equipment, and the pressure detecting parts 11, a switch 12 and a display part 13 are connected to a control part 14. A storage part 15, a pressure frequency analyzing part 16, accumulated time ratio analyzing part 17, a computing part 18, and a comparing part 19 are provided in the control part 14. On the basis of a measured value of the pressure detecting parts 11, pressure frequency analysis or accumulated time ratio analysis is performed to compute pressure frequency damage or accumulated time ratio damage. Each damage is compared with the performance limit value, and the judged result is displayed on a display part so as to notify an operator of the performance limit of each hydraulic equipment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a performance limit display device for calculating damage of hydraulic equipment in a construction machine and comparing it with a performance limit value to notify the life of the hydraulic equipment.

[0002]

2. Description of the Related Art A large number of hydraulic equipment such as hydraulic pumps, hydraulic motors and hydraulic cylinders are used in construction machines. Further, bearing parts are provided at various places in the hydraulic pump and the hydraulic motor. Service personnel and users regularly inspect and maintain these hydraulic devices.

[0003]

In the conventional construction machine, it is difficult to check the damage of hydraulic equipment at any time, and a failure may occur before the next periodic inspection. If a failure occurs in the hydraulic equipment, the construction machine must be stopped for a long time, and there is a problem that the operating rate decreases. Moreover, if the hydraulic equipment suddenly breaks down during work, there is a great risk of an accident.

Therefore, there arises a technical problem to be solved in order to calculate the damage of the hydraulic equipment in the construction machine and automatically perform the diagnostic display of the performance limit of the hydraulic equipment. The purpose is to solve.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been proposed in order to achieve the above-mentioned object, and a pressure detection unit for measuring pressure, frequency and time acting on a hydraulic device, and the hydraulic device is fixed. The storage unit of the P-N diagram that represents the allowable number of times the pressure acts to secure the life of the device, the pressure frequency analysis unit that analyzes the number of times the pressure is generated per unit time, and the pressure from the P-N diagram Is calculated, the calculation unit calculates the pressure frequency damage of the hydraulic device by the pressure frequency and the allowable number of times to calculate the life of the hydraulic device, and the performance limit value of the pressure frequency specified in advance. A performance limit display device for a hydraulic device in a construction machine, which includes a comparison unit that determines the life of the hydraulic device that has been calculated, and a display unit that can display the determination result of the comparison unit, and acts on the hydraulic device. Measure pressure, frequency and time A pressure detecting unit, and the accumulated time rate analysis unit representing the rate at which pressure is exerted among the life of the hydraulic equipment,
A computing unit for computing the cumulative time rate damage of the hydraulic equipment based on the pressure and the cumulative time rate; and a comparing section for comparing and comparing the performance limit value of the predefined time rate with the calculated cumulative time rate damage, To provide a performance limit display device for hydraulic equipment in a construction machine, which comprises a display part capable of displaying a judgment result of a comparison part.

[0006]

[Operation] The pressure, frequency and time acting on each hydraulic device are measured by the pressure detection unit. The storage unit stores a P-N diagram representing the allowable number of times pressure is applied to each hydraulic device in order to ensure a certain life. In the pressure frequency analysis unit, the number of times the pressure ΔP _i is generated per unit time is calculated as the pressure frequency n _i.
Expressed as (times / hour). Then, in the calculation unit, the P-
The allowable number of times N _i when the pressure ΔP _i is generated is calculated from the N diagram, the pressure frequency damage ΣD of each hydraulic device is calculated from the pressure frequency n _i and the allowable number of times N _i, and the life L of each hydraulic device is calculated. Calculate

Alternatively, based on the measurement value of the pressure detection unit,
In the cumulative time rate analysis section, pressure Δ
It represents a ratio (cumulative time ratio) B _{i at} which P _i acts. Then, the calculating unit calculates the cumulative time rate damage ΣD _L of each hydraulic device from the pressure ΔP _i and the cumulative time rate B _i .

Further, in the comparison section, the performance limit value H _G of the pressure frequency defined in advance is compared with the life L of each hydraulic equipment calculated by the calculation section. Alternatively, the performance limit value D _{G of} the predefined time rate and the cumulative time rate damage ΣD _L calculated by the calculation unit are compared and determined.

The determination result of the comparison section is displayed on the display section,
Notify the operator whether each hydraulic equipment has reached the performance limit.

[0010]

An embodiment of the present invention will be described in detail below with reference to the drawings. 1 is a block diagram of a performance limit display device, in which a pressure detection unit 11, 11, ... Is provided for each hydraulic device, and the pressure detection unit 11, the switch 12, and the display unit 13 are provided as a control unit 1.
4 is connected. A storage unit 15, a pressure frequency analysis unit 16, a cumulative time rate analysis unit 17, and a calculation unit 1 are included in the control unit 14.
8. A comparison unit 19 is provided, and the damage of each hydraulic device determined by the control unit 14 is output to the display unit 13 such as a CRT display or a liquid crystal display unconditionally or when the switch 12 is turned on.

Next, the procedure for calculating the damage due to the pressure frequency and displaying the performance limit of each hydraulic device will be described with reference to the flowchart of FIG. First, the pressure detector 1
The pressure, frequency and time acting on each hydraulic device are measured by 1 (step 101). Based on the measured value of the pressure detection unit 11, the pressure frequency analysis unit 16 determines the number of times the pressure ΔP _i occurs per unit time as the pressure frequency n _i (times / hour).
Is expressed as follows (step 102).

Further, in the storage unit 15, P as shown in FIG.
-N diagram is stored. The PN diagram represents an allowable number N of times that the pressure P acts in order to ensure a certain life of the hydraulic equipment when the pressure P acts on each hydraulic equipment. the allowable number of times N _i when all times the pressure [Delta] P _i is generated from the P-N diagram calculated, the number of up cracks in the hydraulic equipment under pressure [Delta] P _i N _i
Is expressed as follows (step 103).

The pressure frequency n _i and the allowable number of times N _i
By using, the pressure frequency damage for each pressure ΔP _i of the hydraulic device is calculated as follows. D ₁ ………… n ₁ / N ₁ (1 / hour) :: :: :: D _n ………… N _n / N _n (1 / hour)

Further, the damages D _{1 to} D _n for each pressure ΔP _i are summed up to calculate the damage to the total pressure P of the hydraulic equipment (step 104). ΣD = Σ (n / N) (1 / hour) (Equation 1) The life L of the hydraulic equipment is calculated from (Equation 1) (step 105). L = 1 / ΣD (time) …… (2 formulas)

The comparison unit 19 compares the performance limit value H _G of the pressure frequency defined in advance for the hydraulic device with the life L of the hydraulic device calculated by the calculation unit 18. (Step 106). Here, the life L of the hydraulic equipment
Is larger than the pressure frequency performance limit value H _G , there is no fear of failure, and if the switch 12 is off (step 107), no message or the like is displayed on the display unit 13 (steps 107 → 108).

In step 107, when the operator has turned on the switch 12, the display unit 13
The remaining life of the hydraulic equipment is displayed on and the performance limit is notified to the operator (step 107 → 109).

On the other hand, in step 106, the hydraulic equipment
Life L is the pressure frequency performance limit value H _GWhen:
Indicates that the life of hydraulic equipment has reached the performance limit of pressure frequency.
Is displayed on the display unit 13, and the hydraulic equipment
Notify the operator that maintenance is required
(Steps 106 → 109).

Further, as shown in the flow chart of FIG. 4, the damage due to the cumulative time rate may be calculated to display the performance limit of each hydraulic equipment. First, the pressure detector 11
The pressure acting on each hydraulic device, the frequency and the time are measured (step 201). Based on the measurement value of the pressure detection unit 11, the cumulative time rate analysis unit 17 indicates how much the pressure ΔP _i acts in the entire life of the hydraulic device (step 202).

Then, the calculation unit 18 calculates the damage of the cumulative time rate for each pressure ΔP _i of the hydraulic equipment from the pressure ΔP _i and the cumulative time rate B _i as follows. D _L1 = (ΔP ₁ ) ³ × B _{1 :: :: :: DLn} = (ΔP _n ) ³ × B _n

Further, the damage D _{L1 to} D _Ln for each pressure ΔP _i are summed up to calculate the cumulative time rate damage for all the pressure P of the hydraulic equipment (step 203). _{ΣD L = Σ ((ΔP)} 3 × B) ...... (3 type)

Then, in the comparison unit 19, the hydraulic equipment is
On the other hand, the performance limit value D of the pre-specified time rate_GAnd said performance
Cumulative time rate damage of hydraulic equipment calculated by the calculation unit 18
ΣD _LAre compared and judged (step 204). Where the oil
Cumulative time rate damage to pressure equipment ΣD_LIs the performance limit of time rate
Value D_GWhen it is smaller, there is no fear of breakdown,
If the switch 12 is off (step 205), the display unit 1
No message is displayed in 3 (step 205 → 20)
6).

In step 205, when the operator turns on the switch 12, the display unit 13
The cumulative time-rate damage of the hydraulic equipment is displayed on the display to notify the operator (step 205 → 207).

On the other hand, in step 204, the cumulative time rate damage ΣD _{L of the} hydraulic equipment is the performance limit value D _{G of the} time rate.
When the above is reached, a message indicating that the hydraulic equipment has reached the performance limit value of the time rate is displayed on the display unit 13 to notify the operator that it is necessary to inspect and maintain the hydraulic equipment (step 204). → 207).

As described above, not only the performance limit of each hydraulic device is displayed, but also the damage before the performance limit is displayed, so that the operator can check the damage of each hydraulic device at any time, and the failure of each hydraulic device can be prevented. Can be prevented.

The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified one.

[0026]

As described in detail in the above one embodiment, the present invention analyzes the pressure frequency and the cumulative time rate of each hydraulic equipment in a construction machine to analyze the performance limit of each hydraulic equipment and the performance limit before the performance limit. Since the damage is self-diagnosed and displayed, the operator can know the proper maintenance time for each hydraulic device. Therefore, the failure of the hydraulic equipment can be found easily and quickly, and the occurrence of an accident can be prevented.

[Brief description of drawings]

FIG. 1 is a block diagram of a performance limit display device for hydraulic equipment according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an example of control.

FIG. 3 is a PN diagram of a hydraulic device.

FIG. 4 is a flowchart showing another example of control.

[Explanation of symbols]

 11 Pressure Detecting Section 12 Switch 13 Display Section 14 Control Section 15 Storage Section 16 Pressure Frequency Analysis Section 17 Cumulative Time Rate Analysis Section 18 Computing Section 19 Comparison Section

Claims (2)

[Claims] 1. A pressure detector for measuring pressure, frequency and time acting on a hydraulic device, and a P-N diagram showing an allowable number of times the pressure acts on the hydraulic device in order to ensure a certain life. A storage unit, a pressure frequency analysis unit that analyzes the number of times pressure is generated per unit time, an allowable number of times when pressure is generated from the PN diagram, and the hydraulic frequency of the hydraulic equipment is calculated based on the pressure frequency and the allowable number of times. A calculation unit that calculates the pressure frequency damage and calculates the life of the hydraulic device, a comparison unit that determines and compares the performance limit value of the pressure frequency specified in advance and the calculated life of the hydraulic device, and a determination of the comparison unit A performance limit display device for hydraulic equipment in a construction machine comprising a display unit capable of displaying results. 2. A pressure detection unit for measuring pressure, frequency and time acting on the hydraulic device, a cumulative time rate analyzing unit showing a ratio of pressure acting on the entire life of the hydraulic device, and the pressure and the cumulative value. A calculation unit that calculates the cumulative time rate damage of the hydraulic equipment based on the time rate, a comparison unit that compares and compares the performance limit value of the predefined time rate with the calculated cumulative time rate damage, and the determination of the comparison unit A performance limit display device for hydraulic equipment in a construction machine comprising a display unit capable of displaying results.