JPH05312660A - Device for reporting replacement timing of rubber hose - Google Patents

Abstract

PURPOSE:To obtain a device for alarming replacement timing of a rubber hose to determine its durability. CONSTITUTION:In a device for determining alarming timing of a rubber hose which is used to connect hydraulic equipment such as a pump, a switching valve, or a cylinder which are mounted on a vehicle etc., an input means for inputting the maximum life time of the fitted rubber hose, an input means for inputting a mounting coefficient according to the mounting condition of the fitted rubber hose, and a hydraulic sensor 13 for measuring hydraulic loading which is applied to the rubber hose are provided. Furthermore, an oil temperature sensor 12 for measuring oil temperature which is applied to the rubber hose, an operation device for calculating the life of the rubber hose according to signals from each sensor and input values, and a display 4 for displaying replacement timing of the rubber hose according to the operation result are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber hose replacement timing notification device, and more particularly to an improvement of a rubber hose replacement timing notification device for determining the durability of a rubber hose.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, many construction machines and the like are hydraulically driven using a hydraulic pump 61, a switching valve 63, etc. as a drive source for driving a working machine or a traveling device. A large number of hydraulic rubber hoses 50 (hereinafter referred to as hydraulic hoses 50) are used to connect the hydraulic equipment. Since these hydraulic hoses 50 are expensive, other hydraulic hoses 50 are often replaced when bursting or depending on the external appearance of the hydraulic hose 50, except for those whose safety parts have a designated replacement time. .. However, since those that can still be used may be replaced, the deterioration state of the hydraulic hose 50, that is, (1) the electric resistance of the hydraulic hose 50 is measured, or (2) the hardness of the elastic layer of rubber. Is measured, and when the measured value exceeds a predetermined value, replacement is performed.

[0003]

However, when the above-mentioned conventional rubber hose bursts, it is necessary to replace it because the hot oil leaks due to the burst, so that it causes burns when it hits a human being, and the exhaust pipe of the engine. When it gets on a high temperature part such as a car, it causes a fire. In addition, when visually inspecting the degree of external damage of the rubber hose, it can be determined when the outer surface of the rubber hose is damaged, but cannot be determined when the inner surface of the rubber hose is deteriorated. .. Further, in the case of measuring the hardness of rubber (1), it is necessary to add conductive rubber (measurement terminal) or the like to the hydraulic hose in advance, which increases the cost and shortens the service life. In the case of (2), it takes a lot of man-hours to remove the rubber hose from the vehicle for the measurement for the measurement, or the deterioration state of the entire rubber elastic body layer is known only in a narrow range and the entire deterioration state cannot be grasped. There is a problem.

The present invention focuses on the above-mentioned conventional problems, and relates to a rubber hose replacement time notification device, and particularly, an object thereof is to improve a rubber hose replacement time notification device for knowing the durability of the rubber hose.

[0005]

In order to achieve the above object, according to a first aspect of the present invention, a rubber hose used for connecting a hydraulic device such as a pump, a switching valve or a cylinder mounted on a vehicle or the like. In the device that determines the replacement time of, the input means for inputting the maximum life time of the attached rubber hose, the input means for inputting the attachment coefficient according to the attachment status of the attached rubber hose, and the hydraulic sensor for measuring the oil pressure applied to the rubber hose. It consists of an oil temperature sensor that measures the oil temperature applied to the rubber hose, a calculation device that calculates the life of the rubber hose from the signal and input value from each sensor, and a display device that displays the replacement time of the rubber hose based on the calculation result. ..

[0006]

In general, the deterioration of the rubber hose is determined by the temperature and pressure of the hydraulic oil applied to the rubber hose, the time it is applied, and the mounting state. Therefore, according to the above configuration, the rubber hose in the mounted state has a predetermined temperature and a predetermined temperature. The operating data of the rubber hose was measured by adding the hydraulic oil of the pressure, and the deterioration data of the rubber hose was measured. Based on the acquired data, the usage conditions were entered according to the usage condition, and the data and the data were mounted on the vehicle. Measures the oil temperature and oil pressure of the rubber hose in the state, compares and calculates the deterioration of the rubber hose, and reports the replacement time. As a result, it is possible to obtain a highly reliable notification of the replacement time as compared with the related art.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a rubber hose replacement timing notification device according to the present invention will be described in detail below with reference to the drawings. The same parts as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted. FIG. 1 shows a hydraulic hose 5 according to an embodiment of the present invention.
FIG. 2 is a block diagram showing the overall configuration of the 0 replacement timing notification device. In FIG. 1, the replacement time notification device body 1 of the hydraulic hose 50 includes a power switch 2, an alarm lamp 3 indicating the life of the hydraulic hose 50, and a remaining life time display unit 4 for displaying the remaining life of the hydraulic hose 50. Cumulative use time display section 5 that is displayed according to the oil temperature and hydraulic pressure usage conditions up to now, and the maximum life time setting section that is displayed according to the mounting conditions of the mounting conditions based on the durability results of the test depending on the mounting condition etc. 6 and a mounting coefficient input section 7 for setting a mounting coefficient depending on the mounting state of the hose
And a release switch 8 to release the lighting of the alarm lamp
And a data processing unit 10 for calculating and comparing, and an input setting unit 20 for inputting initial setting conditions such as relief pressure.
Consists of. Further, the replacement time notification device body 1 of the hydraulic hose 50 includes a power supply unit 11 for supplying electric power such as a battery mounted on the vehicle, a temperature sensor 12 for measuring the temperature of oil flowing inside the hydraulic hose 50, and a hydraulic hose. A pressure sensor 13 for measuring the hydraulic pressure applied to 50 is connected by an electric wire 15.

As shown in FIG. 2, the data processing unit 10 includes
The maximum life time signal 6a from the input setting section, the attachment coefficient signal 7a for setting the attachment coefficient according to the attachment state of the hose, the release signal 8a for releasing the lighting of the alarm lamp, and the inside of the hydraulic hose 50 A temperature signal 12a for measuring the flowing oil temperature, a pressure signal 13a for measuring the hydraulic pressure applied to the hydraulic hose 50, and an initial setting signal 20a for initial setting conditions such as relief pressure are input. The data processing unit 10 outputs a remaining life time display signal 4b, a cumulative use time display signal 5b up to the present time, and a lighting signal 3b for lighting the alarm lamp 3.

Next, the operation of the above structure will be described.
The power of the replacement time notification device body 1 of the hydraulic hose 50 is supplied from the power supply unit 11 mounted on the vehicle, and is turned on and off by the power switch 2. The pressure of the hydraulic oil flowing through the hydraulic hose 50 is measured by the pressure sensor 13, and the measured value is input to the data processing unit 10. Further, the temperature of the hydraulic oil is measured by the temperature sensor 12, and the measured value is input to the data processing unit 10. As shown in FIG. 3, in the data processing unit 10, the input setting unit 20 inputs conditions for using the hydraulic hose 50 in step 1, for example, initial setting conditions such as set pressure of the pressure regulating valve. In step 2, the attachment coefficient value Ks of the rubber hose is set to the attachment coefficient input section 7
Enter more. At this time, the attachment coefficient value Ks is, for example,
As shown in FIG. 4, when (1) the rubber hose is linearly attached and both ends are fixed, Ks = 1.
0, (2) When bent and attached and both ends are fixed, Ks = 1.5, (3) Rubber hose is attached linearly, but when one or both ends move Ks = 2.0, (4) is bent and attached, and when one end or both ends move, Ks = 3.
It is set according to each usage place such as 0 according to usage conditions. In step 3, the maximum life time Lm set in the test is input from the maximum life time setting unit 6 according to the rubber hose to be used. In step 4, the pressure coefficient Kv is calculated. Pressure coefficient Kv is pressure conversion coefficient K
1 multiplied by the pressure measurement value v from the pressure sensor (Kv = K
1 × v). At this time, for example, the pressure coefficient Kv
Is (1) 1.0 for 300 kg / cm2 or less, (2) 300
〜350Kg / cm2 is 1.2, and (3) 350Kg / cm2 or more is 1.5. In step 5, the temperature coefficient Kt is calculated. Temperature coefficient Kt
Is the temperature conversion coefficient K2 and the temperature measurement value t from the temperature sensor.
Is calculated (Kt = K2 × t). At this time, for example, the temperature coefficient Kt is (1) 1.0 at 80 ° C. or lower,
(2) 80 ° C to 100 ° C is 1.2, (3) 100 ° C to 1
20 ° C. is 1.4, and (4) 120 ° C. or higher is 2.0. In step 6, the remaining life time Lf of the rubber hose is calculated by the following equation.

## EQU1 ## Lf = [Lm-.SIGMA. (Ks.times.Kv.times.Hi), where i = 0 to n] where Hi: sampling time interval, and in step 7, the remaining life time Lf of the rubber hose obtained in step 6
Is displayed on the remaining life time display section 4. In step 8,
The accumulated use time [(ΣHi), where i = 0 to n] obtained based on the oil temperature and oil pressure use conditions up to now is displayed on the accumulated use time display unit 5. In step 9, it is judged whether or not the remaining life time Lf of the rubber hose has become zero. If it is zero, the process goes to step 10. If it is not zero,
Return to step 4. In step 10, the alarm lamp 3 is turned on. In step 11, it is determined whether or not the release switch 8 of the alarm lamp 3 has been pressed. If so, the rubber hose is replaced in step 12. If not, the process returns to step 10 and the lighting of the alarm lamp 3 is continued. From the above, the life of the rubber hose can be estimated according to the usage status of the hydraulic oil.

[0010]

As described above, according to the present invention,
Preliminarily add working oil at a certain temperature and pressure to the rubber hose in the installed state to grasp the durability and measure the deterioration data of the rubber hose, and then use that data and the oil temperature of the rubber hose installed in the vehicle. The excellent effect of measuring the oil pressure, comparing and calculating the deterioration of the rubber hose, and notifying the replacement time can be obtained.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram schematically showing a rubber hose replacement timing notification device according to an embodiment of the present invention,

FIG. 2 is a block diagram of the present invention,

FIG. 3 is a flowchart of a data processing unit,

FIG. 4 is a diagram illustrating an example of an attachment coefficient,

FIG. 5 is a diagram showing an example of a construction machine in which a rubber hose is used,

[Explanation of symbols]

 1 rubber hose replacement timing notification device, 2 power switch, 3 alarm lamp, 4 remaining life time display section, 5 accumulated usage time display section, 6 maximum life time setting section, 7 mounting coefficient input section, 8 release switch 10 data processing section , 12 temperature sensor, 13 pressure sensor,

Claims (1)

[Claims] 1. A device for deciding a replacement time of a rubber hose used for connecting a hydraulic device such as a pump, a switching valve or a cylinder mounted on a vehicle or the like, and an input means for inputting a maximum life time of the attached rubber hose, Input means to input the attachment coefficient according to the installation status of the attached rubber hose, oil pressure sensor to measure the oil pressure applied to the rubber hose, oil temperature sensor to measure the oil temperature applied to the rubber hose, and signals and input values from each sensor A rubber hose replacement time notification device comprising a calculation device for calculating the life of the rubber hose from the above and a display device for displaying the replacement time of the rubber hose based on the calculation result.