JPS6359096B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for automatically collecting sample oil for contaminant analysis from hydraulic lines provided in various construction machines, machine tools, auxiliary machines, and the like.

Among working machines that have hydraulic lines, especially construction machines, failures can be prevented by knowing in advance the so-called internal state of the machine, such as the wear characteristics of each component and the ingress of foreign substances without disassembling the machine. As a scientific preventive maintenance method, it is already known to periodically sample oil from a hydraulic line and subject it to analysis.

By the way, in the past, such oil sampling was carried out manually at predetermined intervals, which required the operation of the machine to be interrupted during sampling, and caused inconveniences such as the sample oil overflowing outside. There are many.

In particular, for this type of oil analysis, the important conditions for effectiveness are that the sample oil be sufficiently warmed and well-stirred, and that other oils, foreign substances, dust, etc. should not be newly mixed in during oil sampling. There is.

However, in general, the above-mentioned oil sampling must be carried out by the user (customer) himself in order to satisfy the above conditions and to be careful not to introduce new foreign substances at the correct sampling time.
However, the above conditions are often not met because the work becomes extremely complicated.

Additionally, the sampling device of U.S. Patent No. 3,062,055 shows a configuration that automatically collects sample oil by lowering the pressure until a predetermined amount is obtained, and the sampling device of U.S. Pat. discloses an arrangement in which a valve means is opened to periodically sample working fluid.

However, in the former case, the structure becomes complicated, and in construction machinery, no structure has been proposed in which a certain amount of pressure oil introduced from a hydraulic line is introduced into a collection bottle after lowering the pressure.

That is, since the flow rate of hydraulic oil differs depending on its viscosity, temperature, and other conditions, if pressure oil is allowed to flow in from the hydraulic line for a certain period of time, the amount will vary, and if it is large, it will overflow from the storage section.

Furthermore, if the oil is directly introduced into the sampling bottle from the hydraulic line, there is a risk that the sampling bottle will separate due to the pressure of the hydraulic oil.

Therefore, the reality is that it is difficult to maintain and manage this type of oil.

This invention was made as a result of intensive research in view of the above circumstances.
It was done anew.

The main object of this invention is to eliminate the need to interrupt the operation of the construction machine for oil sampling, and to reduce the pressure of the pressure oil introduced from the hydraulic line of the construction machine so that it does not work, while having a simple configuration. To provide an automatic oil sampling device in which a certain amount of oil is stored in advance through a hydraulic line, and when introduction from a hydraulic line is completed, a switching valve is used to cause the sampled certain amount of oil to flow down into a sampling bottle.

In order to achieve the above object, the present invention provides a device that automatically collects sample oil from a hydraulic line of a construction machine, and (A) integrates the actual operating time of the construction machine and calculates the cumulative time to a preset time. (B) A solenoid switching valve is provided that opens the hydraulic line when the control signal is input from the time integrating mechanism and blocks the hydraulic line when the control signal is cut off. , (C) an accumulator that is connected to the hydraulic line through the electromagnetic switching valve and introduces sample oil; (D) the accumulator is movable up and down into (a) the bottom cylindrical pressure accumulation chamber; (b) a spring that constantly biases the piston in the downward direction; (c) an oil guide path that extends downward along the bottom of the chamber and opens laterally to the outside; (d) ) The oil guide path branches at the branch point at the tip, one side opens at the bottom of the pressure accumulation chamber, the other side opens downward to the outside as a discharge side oil path, and the oil path communicates with one of the branch paths and closes the other. A technical measure has been taken to install a road switching valve.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings. The automatic oil extraction device according to the present invention is equipped with an accumulator 4 that introduces sample oil from an existing hydraulic line 1 to operating machines such as various construction machines, machine tools, and auxiliary machines via a switching valve 2.

The illustrated accumulator 4 includes a piston 33 that is built into a bottomed cylindrical pressure accumulation chamber 4a so as to be able to slide up and down via an O-ring 33a, and a spring 34 that constantly biases the piston in the downward direction. , and an oil guide path 39 formed in the bottom wall of the pressure accumulating chamber 4a and connected to the pipe line 6 from the switching valve 2.

The oil guide path 39 opens at the center of the inner bottom of the pressure accumulating chamber 4a.

Further, a sample oil discharge side oil passage 41 is branched from the oil guide passage 39, and an oil passage switching cock 42 is provided at the branch portion.

The cock 42 can be switched between the illustrated position in which the discharge side oil passage 41 is closed and the oil guide passage 39 communicates with the pressure accumulation chamber 4a, and the position in which the discharge side oil passage 41 is communicated with the pressure accumulation chamber 4a. It is equipped with a lever 43 for switching the switch.

The discharge side oil passage 41 opens at the outer bottom of the pressure accumulation chamber 4a, and a discharge nozzle 40 is vertically installed in the opening, and a bottomed cylindrical cap 40a is detachably attached to the nozzle. It's becoming like that.

On the other hand, the switching valve 2 is composed of an electromagnetic valve having an electromagnetic coil 2a on one end side and a spool spring 2b on the opposite side, and is connected to the hydraulic line 1 and the accumulator 4 at the spool switching position when the electromagnetic coil 2a is excited.
Connect the pipe line 6 on the side and connect the spool spring 2 on the other end side.
In the switching position b, on the contrary, the hydraulic line 1 is blocked.

The electromagnetic coil 2a of the switching valve 2 is electrically connected to the output section of the time integration mechanism 8.

The mechanism 8 is for controlling the switching valve 2 with a signal, and accumulates the actual operating time of a working machine equipped with the hydraulic line 1, such as a construction machine such as a loader or a tractor, and sets the accumulated time in advance. When the time is reached, a valve control signal is sent to the electromagnetic coil 2a of the switching valve 2 to energize the coil.

In this case, the time integration mechanism 8 is set in advance so as to output the valve control signal only during the time period required for oil sampling that is appropriate to the capacity of the pressure accumulation chamber 4a. The output time period of the control signal is determined by setting the number of pulses of the signal in advance.

When the switching valve 2 is switched by the control signal from the time integrating mechanism 8 in a state where the cock 42 closes the discharge side oil passage 41, the pressure oil from the hydraulic line 1 passes through the oil guide passage 39 to the cock 42. , and is gradually stored in the pressure accumulating chamber 4a while pushing up the piston 33.

When the control signal is cut off and the amount of oil stored in the pressure storage chamber 4a reaches a fixed amount, the switching valve 2
is switched and the hydraulic line 1 is blocked.

Therefore, to extract oil from the accumulator 4, remove the nozzle cap 40a at an appropriate time, apply the opening of a separately prepared oil sampling bottle, etc. to the discharge nozzle 40, and then move the pot 42 to the lever 43. Therefore, this is accomplished by switching the discharge side oil passage 41 to the open position. In this case, the pressure accumulation chamber 4a
The sample oil inside is pressed through the piston 33 by the tension of the spring 34, so that it is quickly collected from the discharge nozzle 40 into the oil sampling bottle or the like via the discharge side oil passage 41.

After the recovery, the cock 42 is switched to a position where the discharge side oil passage 41 is closed and the oil guide passage 39 is communicated with the pressure accumulation chamber 4a.

The switching can also be done automatically by spring means or the like.

In this way, a fixed amount of sample oil collected in a bottle or the like is subjected to oil analysis.

Note that the time integration mechanism 8 may be replaced with a sensor that measures the actual operating status of each component of the machine or a sensor that detects the status of the hydraulic line, and the control signal for the switching valve may be transmitted from the sensor. good.

Further, the time integration mechanism or sensor may be used in conjunction with a computer system, the computer may calculate the sampling timing of the hydraulic line, and the output signal of the computer at the time of the calculation may be used as the control signal for the switching valve. In this case, an alarm signal may be issued at the end of sampling.

As described above, according to the present invention, a fixed amount of sample oil can be automatically collected in advance into the accumulator from the hydraulic line of the machine every fixed operating time of the machine, so it is possible to There is no need to interrupt machine operation as in the past.

Moreover, the sample oil in the accumulator is
You can quickly collect the waste into bottles, etc. just by finding a convenient time and performing some very simple operations.

Therefore, the present invention is extremely effective for regular or periodic oil analysis of working machines equipped with hydraulic lines, and greatly contributes to improving the maintenance and management of this type of oil.

[Brief explanation of the drawing]

The drawing is a sectional view of an automatic oil extraction device according to a preferred embodiment of the present invention. 1 is a hydraulic line, 2 is a switching valve, 4 is an accumulator, 8 is a time integration mechanism, 41 is a sample oil discharge side oil passage, and 42 is a cock.

Claims (1)

[Scope of Claims] 1. A device that automatically collects sample oil from a hydraulic line of a construction machine, which accumulates the actual operating time of the construction machine, and when the accumulated time reaches a preset time, extracts sample oil for a fixed period of time. A time integration mechanism that outputs a control signal; an electromagnetic switching valve that opens a hydraulic line when a control signal is input from the time integration mechanism and blocks the hydraulic line when the control signal is cut off; an accumulator that is connected to introduce sample oil; the accumulator includes a piston that is movable up and down in a bottomed cylindrical pressure accumulation chamber; a spring that constantly biases the piston in a downward direction; An oil guide path that extends downward along the bottom of the pressure accumulation chamber and opens laterally to the outside; and an oil guide path that branches at a branch point at the tip of the oil guide path, with one opening at the bottom of the pressure accumulation chamber and the other discharging downward to the outside. An automatic oil extraction device comprising an oil passage switching valve that opens as a side oil passage, communicates with one of the branch passages, and closes the other.