JPS6345533B2 - - 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.

Further, the sampling device of U.S. Pat. No. 3,218,868 shows a configuration of a valve body that opens and closes a duct for sampling oil by the movement of a piston, and the sampling device of U.S. Pat. No. 3,730,001 has an automatic valve means. A configuration is disclosed that opens and periodically withdraws working fluid. However, in the above configuration, it is not possible to introduce a certain amount of pressure oil introduced from the hydraulic line of the construction machine into the sampling bottle.

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 that there is no need to interrupt the operation of construction machinery for oil sampling, and that a certain amount of oil is stored in advance by reducing the pressure of the pressure oil introduced from the hydraulic line of the construction machinery so that it does not work. Another object of the present invention is to provide an automatic oil sampling device that allows a certain amount of the sampled oil to flow down by gravity into a sampling bottle at the time when the introduction from the hydraulic line is completed.

In order to achieve the above object, the present invention provides an apparatus for automatically sampling 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 at a predetermined 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) a metering mechanism that is connected to the hydraulic line through the electromagnetic switching valve and introduces sample oil; (D) an oil collection container that is detachably attached to the metering mechanism; (E ) The metering mechanism (a) includes a spool chamber having an input port connected to the hydraulic line via a magnetic switching valve; (b) is disposed above the spool chamber and connects to the hydraulic line via a relay oil introduction port; (c) an outlet that communicates with the spool chamber and is bored below it at a position out of phase with the relay oil introduction port and that can discharge sample oil into the oil sampling container; (d) Provide a spool built into the spool chamber and both slotted; (e) Relay by a spool that is pushed by pressure oil introduced from the inlet port when the hydraulic line is opened. (f ) Providing a sliding piston built into the pressure accumulation chamber; (g) urging the piston, which is pushed by pressure oil introduced into the pressure accumulation chamber through the relay oil introduction port, toward the relay oil introduction port; A technical measure is taken to provide a piston biasing means.

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 a metering mechanism 26 that temporarily 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. It has a similar structure.

The housing 26a of the mechanism 26 includes an upper pressure accumulation chamber 9b and a lower spool chamber 27 parallel to this.
and a bottle attachment opening 10 that opens at the bottom thereof.

The opening of the oil sampling bottle 5 is detachably attached to the attachment port 10 by screwing or the like.

Further, the housing 26a is connected to the hydraulic line 1.
An inlet port 12a to which the pipe line 6 from the switching valve 2 attached to the switch valve 2 is connected and communicates with the spool chamber 27; a relay oil introduction port 28 that communicates the pressure accumulation chamber 9b and the spool chamber 27 on the inlet port side; It has an outlet port 29 that communicates the spool chamber 27 and the bottle attachment port 10 nearby, and air vent holes 30 to 32 provided on the opposite side of the inlet port 12a.

In the housing 26a, the upper pressure accumulation chamber 9b slidably houses a piston 33, and the piston is always urged toward the relay oil introduction port 28 by a spring 34. On the other hand, the lower spool chamber 27 has a spool 35 slidably built therein.
The spool is also always urged by a spring 36 in the same direction as the piston 33, that is, toward the inlet port 12a.

The spool 35 has a front land 35a and a rear land 35b by forming a slot 37 on its outer peripheral surface, and one end is connected to the front land 35.
It is provided with an orifice 38 which opens at the distal end surface of a and whose other end opens into the slot 37.

The spool 35 has a spring 36
At the forward end position (as shown), the front land 35a connects the input port 12a and the relay oil guide port 28.
In this state, the relay oil guide port 28 and the outlet port 29 are communicated through the slot 37, and when switching is performed using pressure oil from the inlet port 12a, the front land 35a The oil is adapted to pass through port 28 and block outlet port 29.

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 metering mechanism 2 at the spool switching position when the electromagnetic coil 2a is excited.
The hydraulic line 1 is connected to the pipe line 6 on the 6 side, and the hydraulic line 1 is blocked in the switching position by the spool spring 2b on the other end side.

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 integrates the actual operating time of an operating mechanism equipped with the hydraulic line 1, for example, a construction machine such as a loader or a tractor, and the integrated time is set 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 integrating mechanism 8 is set in advance so as to output the valve control signal only during a time period corresponding to the oil sampling capacity of the oil sampling bottle 5. 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 integration mechanism 8, the pressure oil from the hydraulic line 1 acts on the front end surface of the spool 35 of the metering mechanism 26 via the pipe line 6 and the inlet port 12a. To do this, the spool is pushed against the spring 36.

When the front land 35a of the spool passes through the relay oil introduction port 28, this port and the inlet port 12a communicate with each other, and pressure oil from the inlet port is introduced into the pressure accumulation chamber 9b. Therefore, the spool 35 is maintained in a balanced state in a position where the front land 35a blocks the outlet port 29.

On the other hand, the pressure oil introduced into the pressure storage chamber 9b is stored in the pressure storage chamber 9b by pushing the piston 35 against the spring 34.

When the control signal from the time integrating mechanism 8 is cut off, the switching valve 2 is switched and the hydraulic line 1 is blocked, so that the spool 35 is first pushed by the spring 36. As a result, when the front land 35a of the spool reaches a position where it blocks the inlet port 12a and the relay oil introduction port 28, the port 28 and the outlet port 29 are brought into communication via the slot 37 of the spool.

Therefore, the oil stored in the pressure storage chamber 9b is pushed out from the relay oil introduction port 28 by the tension of the spring 34 that biases the piston 33, and is sent into the oil collection bottle 5 from the outlet port 29 via the slot 37.

In this way, the amount of sample oil that is automatically collected into the oil sampling bottle 5 is always kept within the bottle capacity because the time integration mechanism 8 outputs valve control only during the preset time period as described above. It will be done.

In this way, the bottle 5 from which a fixed amount of sample oil has been collected is removed and used for oil analysis at any time until the time integration mechanism 8 outputs the next valve control signal.

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. .

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, sample oil can be automatically collected from the hydraulic line provided in the machine every fixed operating time of the machine, so there is no need to interrupt the operation of the machine as in the past when performing this type of sampling.

In particular, in this invention, the sample oil from the hydraulic line is once stored in the metering mechanism and then sent from the mechanism into the oil sampling bottle, so that no high pressure from the hydraulic line acts on the bottle.

Moreover, sample oil is introduced from the hydraulic line into the pressure accumulation chamber of the metering mechanism only during the time period when the time integration mechanism is outputting the valve control signal.
Since the time period is preset as the time required for oil sampling commensurate with the capacity of the oil sampling bolt, the amount of sample oil collected in the bottle is always kept within the capacity of the bottle.

Therefore, there is no fear that the sample oil will overflow from the bottle, and the bottle can be smoothly collected at a convenient time.

Therefore, the present invention is extremely effective for regular or periodic oil analysis of operating 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, 5 is an oil sampling bottle, 8 is a time integration mechanism, 26 is a metering mechanism, 9a is a pressure accumulation chamber, 35 is a spool, and 36 is a spring.

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; The spool is composed of a metering mechanism that is connected to introduce sample oil, and an oil collection container that is detachably attached to the metering mechanism, and the metering mechanism has an inlet port that is connected to a hydraulic line via an electromagnetic switching valve. a pressure storage chamber disposed above the spool chamber and communicating with the spool chamber via a relay oil supply port; and a pressure storage chamber communicating with the spool chamber and located below the spool chamber at a position shifted in phase from the relay oil supply port. An outlet port that is drilled and can discharge sample oil into the oil collection container, a spool that is built into the spool chamber and both have slots, and a spool that is pushed by pressure oil introduced from the inlet port when the hydraulic line is opened. A spool that opens the relay oil guide port and closes the outlet port by the spool that is moved, and also returns the spool when the hydraulic line is blocked to communicate the relay oil lead port and the outlet port through the slot. a biasing means, a sliding piston that is built into the pressure accumulation chamber, and a piston that is pushed by pressure oil introduced into the pressure accumulation chamber through the relay oil introduction port and urges the piston toward the relay oil introduction port. An automatic oil extraction device characterized by comprising a piston biasing means.