JPS6338088B2 - - 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.

For example, among working machines with hydraulic lines, especially construction machines, it is possible to prevent failures 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 oil sampling described above must be carried out by the user (customer) himself in order to satisfy the above conditions and must be careful not to introduce new foreign substances at the correct sampling time, which results in a lengthy process. The above conditions are often not met because of the complexity. Additionally, the sampling device of U.S. Patent No. 3,062,055 shows a configuration in which sample oil is automatically sampled by lowering the pressure until a predetermined amount is obtained, and the sampling device of U.S. Pat. U.S. Patent No.
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. An arrangement for periodically sampling fluid is disclosed.

However, for construction machinery, a configuration has not yet been proposed in which a fixed 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 has been done.

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, the sampled certain amount of oil is allowed to flow down at a constant pressure into a collection bottle using a switching valve.

In order to achieve the above object, the present invention provides an apparatus for automatically collecting 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 for a preset time. (b) Provide a time integration mechanism that outputs a control signal for a fixed period of time when the time integration mechanism reaches the spool position of the spool when the electromagnetic coil is excited when the control signal is input from the time integration mechanism. An electromagnetic switching valve is provided which connects the pipe line between the accumulator and the oil sampling bottle to block the pipe line on the oil sampling bottle side, and conversely blocks the hydraulic line when the above control signal is cut off to connect the pipe line between the accumulator and the oil sampling bottle. (c) An accumulator with a fixed volume is provided which is connected to the hydraulic line through the electromagnetic switching valve and introduces sample oil; (d) The accumulator has a discharge port in the above direction and extends in the discharge direction. It has a built-in biased plunger or a sealed pressure accumulation chamber with a discharge port at the inner bottom, and is configured to allow a fixed amount of sample oil to flow into the oil collection bottle by the biasing force of the plunger or the compressive force within the sealed interior. We are taking technical measures to ensure that

In order to achieve the above object, the present invention provides a highly reliable automatic oil sampling system that automatically collects sample oil from a hydraulic line every fixed operating time of the hydraulic line and automatically sets the amount of oil sampled. We are in the process of providing equipment.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings. As shown in FIG. 1, the automatic oil extraction device according to the present invention connects an existing hydraulic line 1 to a switching valve 2 in working machines such as various construction machines, machine tools, and auxiliary machines.
The basic configuration includes a sampling means 3 for automatically sampling sample oil through the sampling means 3.

The sampling means 3, in the case of FIG.
are intervening.

The switching valve 2 connects the hydraulic line 1 and the pipe line 6 on the accumulator 4 side and blocks the pipe line 7 on the oil bottle 5 side at the spool switching position when the electromagnetic coil 2a on the one end side is excited. , and in the switching position by the spool spring 2b on the other end side, the hydraulic line 1 is blocked and the accumulator 4 and the oil sampling bottle 5 are connected via their pipe lines 6 and 7.
It consists of a port switching solenoid valve.

A time integration mechanism 8 is electrically connected to the electromagnetic coil 2a of the switching valve 2 via a limit switch SW.

The time integration mechanism 8 is for controlling the switching valve 2 with a signal, and integrates 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 the accumulated time is a predetermined time ( When a preset time has elapsed, a control signal for the switching valve 2 is generated.

The control signal is transmitted to the electromagnetic coil 2a of the switching valve 2 only when the limit switch SW is on.

Therefore, when the electromagnetic coil 2a inputs the control signal from the time integrating mechanism 8, the switching valve 2 operates as follows.
The position is switched to connect the hydraulic line 1 and the accumulator 4. By switching, hydraulic line 1
Pressure oil is fed into the accumulator 4, and when the amount of oil stored in the accumulator reaches a fixed amount, the limit switch SW is turned off.

The limit switch SW has a function of setting the valve opening time of the switching valve 2 based on the control signal in order to cut off the valve control signal from the time integration mechanism 8 by turning off as described above.

That is, when the limit switch SW is turned off and the valve control signal is cut off, the switching valve 2 is switched by the spool spring 2b. At this switching position, the hydraulic line 1 is blocked and at the same time the accumulator 4 and the oil sampling bottle 5 are connected, so the pressure oil stored in the accumulator 4 is sent to the oil sampling bottle 5 as sample oil. .

The above is the oil sampling system in the case of FIG. 1, and the specific structure of the sampling means 3 in the system is shown in detail in FIG.

That is, the sampling means 3 in this case has the pressure accumulation chamber 9 of the accumulator 4 integrally formed into a hanging cylinder shape, and the oil sampling bottle 5 at a position adjacent to the outside of the pressure accumulation chamber.
It is provided with a unit base 11 in which a screw hole 10 for attaching a bottle is formed for attaching and detachably holding the bottle in suspension.

The base 11 has a port 1 connected to the pipe 6 to the accumulator 4 and leading into the pressure accumulator 9.
2, and a port 14 communicating with the oil sampling bottle 5 to which the pipe line 7 to the oil sampling bottle 5 is connected and which is screwed into the bottle mounting screw hole 10 via an annular packing 13.
An air vent hole 15 communicating with the inside of the oil sampling bottle 5, and an air vent hole 17 provided in the hole and urged in the valve closing direction by a spring 16 are provided at the upper part.

In such a unit base 11, the pressure accumulating chamber 9 of the accumulator 4 has a built-in plunger 19 provided with a packing 18 that is in sliding contact with the inner circumferential surface of the accumulating chamber 9.

The plunger 19 integrally has a plunger rod 20 vertically disposed at its center, and is always urged upward by a spring 22 interposed between the plunger rod 20 and the bottom cover 21 of the pressure accumulating chamber 9.

The bottom cover 21 is screwed to the lower end opening of the pressure accumulating chamber 9 via a packing 23, and has a plurality of air holes 24 and a shaft hole that stands up in the center of the pressure accumulating chamber 9 and inserts the plunger rod 20 into the shaft hole. It has a sleeve shaft 25 that is fitted and aligned.

The lower part of the shaft hole of the sleeve shaft 25, the so-called
The limit switch SW shown in FIG. 1 is installed at the lowering limit position of the plunger rod 20, which is the capacity setting position of the accumulator 4.

The limit switch SW is a normally closed switch that is turned off as described above by being pushed by the plunger rod 20 when it reaches the lower limit position.

The sampling means 3 in the case of FIG. 2 constructed as described above operates as follows.

As described above with reference to FIG.
The pressure oil to be sampled is introduced into the accumulator 4, that is, into the pressure accumulator chamber 9 from the port 12 in FIG. The introduced pressure oil pushes down the plunger 19 and the plunger rod 20 against the spring 22.

When the amount of oil stored in the pressure storage chamber 9 reaches a fixed amount, that is, when the plunger rod 20 reaches its lowering limit position, the limit switch SW is turned off by the plunger rod 20.

Since the control signal from the time integration mechanism 8 is cut off by the off operation, the switching valve 2 switches with its own spool spring 2b to block the hydraulic line 1, and at the same time, the accumulator 4 and the oil sampling bottle 5.
The mutual conduits 6 and 7 are connected.

Therefore, the oil stored in the accumulator 4 is now fed into the oil sampling bottle 5 by the tension of the spring 22 within the accumulator.

In this way, in the embodiments of FIGS. 1 and 2,
After the sample oil from the hydraulic line 1 is temporarily stored in the accumulator 4, it is collected from the accumulator into the oil sampling bottle 5 using only the tension of the spring, so that no high pressure from the hydraulic line acts on the oil sampling bottle. . Moreover, since the accumulator has a metering function that keeps the amount of stored oil constant at all times, the amount of sample oil fed into the oil sampling bottle is always kept within the capacity of the bottle.

Therefore, sample oil from the hydraulic line can be smoothly and automatically sampled in a fixed amount corresponding to the capacity of the oil sampling bottle, and in particular, as mentioned above, the high pressure of the hydraulic line does not act on the oil sampling bottle at all, so the sample oil can be collected automatically. The removal of the bottle from which oil has been sampled can be carried out at any appropriate time, and there is no need to interrupt the operation of the operating machinery for this type of oil sampling or bottle removal.

In the case of the sampling means 3 shown in FIG. 3, the configuration of the accumulator 4a used therein is different from that in FIG. 2.

That is, the accumulator 4a in this case has a so-called non-separator type (direct type) structure in which the entire interior of the pressure accumulating chamber 9a is a hollow oil chamber and there is no plunger or the like in the chamber.

Therefore, unlike the case shown in FIG. 2, the bottom cover 21a of the pressure accumulation chamber 9a completely seals the bottom of the pressure accumulation chamber.

A conduit 6 on the accumulator side, which is connected to the hydraulic line 1 via the switching valve 2, is connected to the inner bottom of the pressure accumulating chamber 9a.

Therefore, the accumulator 4a in this case is
The limit switch SW of the switching valve control system, which was required in the cases of FIGS. 1 and 2, is no longer required.

In this connection, the switching valve 2 used together with the sampling means 3 in this case is adapted to receive a control signal from the time integration mechanism 8. On the other hand, the time integration mechanism 8 integrates the actual operating time of the operating machine and operates for a certain period of time (until the amount of oil stored in the pressure accumulation chamber 9a reaches a fixed amount) from the time when the integrated time reaches a fixed time. ) is designed to emit a control signal.

As mentioned above, the sampling means in the case of FIG. 3 has the same structure as in the case of FIG. .

When the switching valve 2 is switched in response to a signal from the time integration mechanism 8, pressure oil from the hydraulic line 1 is sent into the pressure accumulation chamber 9a from the bottom side through the conduit 6 on the accumulator side.

Therefore, the residual air in the pressure accumulating chamber 9a is gradually compressed into the upper part of the chamber by the pressure oil stored in the chamber.

Then, when the signal transmission time from the time integrating mechanism 8 has elapsed and the signal is cut off, the pressure accumulating chamber 9a
The amount of oil stored within reaches a fixed amount.

The reason for this is that when the signal is cut off, the switching valve 2 is switched by its own spool spring 2b and no pressure oil is supplied into the pressure storage chamber 9a, and the time when the amount of stored oil reaches the fixed amount is reached. This is because the signal transmission time is set in advance.

In this way, when the amount of oil stored in the pressure storage chamber 9a reaches a fixed amount, the switching valve 2 is switched as described above, and the pipe 6 on the accumulator side and the pipe 7 on the oil sampling bottle side are switched.
and continues.

Therefore, most of the oil stored in the pressure accumulating chamber 9a is sent into the oil sampling bottle 5 by the compressed air in the upper part of the chamber. Other effects are the same as in the case of FIG.

Note that the time integration mechanism in each of the above embodiments is as follows:
The sensor 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 that 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, a fixed amount of sample oil can be smoothly and automatically sampled from the hydraulic line every predetermined operating time of the hydraulic line, so there is no need to interrupt the operation of the machine as in the past when performing this type of sampling.

Moreover, since only a fixed amount of the sample oil is collected as described above, the sample oil can be collected at any time that is most convenient, and there is no risk of the sample oil spilling out during the collection.

Therefore, the present invention is extremely effective for periodic 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]

FIG. 1 is a flowchart of an automatic oil extraction device according to a preferred embodiment of the present invention, FIG. 2 is an enlarged sectional view of a sampling means in the same device, and FIG. 3 is a sampling means according to a different embodiment of the present invention. FIG. In the figure, 1 is a hydraulic line, 2 is a switching valve, and 3 is a sampling means.

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 outputs a control signal, and a hydraulic line is connected to the pipe line on the oil collection bottle side at the spool position when the electromagnetic coil is excited when the control signal is input from the time integration mechanism. An electromagnetic switching valve that blocks the pipeline and conversely blocks the hydraulic line when the control signal is cut off to connect the pipeline between the accumulator and the oil collection bottle, and connects the hydraulic line through the electromagnetic switching valve. and an accumulator with a fixed volume into which the sample oil is introduced, and the accumulator has a discharge port above and a built-in plunger biased in the discharge direction, or a sealed tank having a discharge port at the inner bottom. An automatic oil sampling device comprising a pressure accumulating chamber and configured to allow a fixed amount of sample oil to flow into an oil sampling bottle by the biasing force of the plunger or the compressive force within the hermetically sealed chamber.