JPS6322536B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

This invention applies to various types of construction machinery and machine tools,
The present invention relates to a device for automatically collecting sample oil for contaminant analysis from a hydraulic line provided in a working machine such as an auxiliary machine.

[Conventional technology]

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 performed 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 to the 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 matter, 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, taking care not to introduce new foreign substances at the correct sampling time in order to satisfy the above conditions. In many cases, the above conditions are not met because of the In addition, various configurations are known for collecting a fixed amount of pressure oil introduced from a hydraulic line, but all of them have complicated configurations, and if they are constructed mechanically, they inevitably increase in size.

[Problems to be solved by the invention]

This invention was devised as a result of intensive research in view of the above circumstances, and its main problems are:
To provide an automatic oil sampling device which can collect sample oil at an optimal time and can collect only a fixed amount with a simple configuration.

[Means to solve the problem]

In order to solve the above problems, the present invention provides an apparatus for automatically collecting sample oil from a hydraulic line of a machine that operates with a hydraulic line, and includes: (a) connected to the hydraulic line via an electromagnetic switching valve; (b) an oil sampling bottle is removably attached to the bottle holder; (c) the oil sampling bottle holder is provided with an oil passageway for introducing oil from the inlet port; (d) providing a valve stem formed with an outlet port for the introducing oil passage that hangs down inside the oil sampling bottle and opens at a fixed volume position within the oil sampling bottle; (d) is held on the valve stem so as to be slidable up and down; (e) When the oil sampling bottle is removed, the spring force of the spring that had been compressed by the oil sampling bottle is released. A technical measure has been taken in which a closing mechanism is provided in which the means for closing the inlet port or the outlet port slides to a closed position by the released spring force.

[Effect]

An oil sampling bottle is removably attached to a bottle holder having an inlet port connected to a hydraulic line via an electromagnetic switching valve, and an oil introduction path from the inlet port is formed on the valve stem that hangs inside the oil sampling bottle. The sample oil is introduced into the oil collection bottle through the outlet port which is set in place. When the sample oil stored in the oil sampling bottle reaches a constant volume position, the float valve floats up to close the outlet port. When the oil sampling bottle is removed, the spring force of the spring that had been compressed by the oil sampling bottle is released, and this released spring force causes the means for closing the inlet port or the outlet port to slide into the closing position. Moving.

【Example】

Hereinafter, preferred embodiments of the present invention will be described based on the drawings. The automatic oil extraction device of the present invention includes a bottle holder 56 having an inlet port 45 connected to an existing hydraulic line 1 of various construction machines, machine tools, auxiliary machines, etc. via an electromagnetic switching valve 2. , and an oil sampling bottle 5 that is detachably attached to the holder. The bottle holder 56 illustrated in FIG. 1 has a unit base structure that also serves as a canopy for the oil sampling bottle 5, and the opening neck of the oil sampling bottle 5 is connected to the bottle attachment opening 10 formed at the bottom through the packing 13. It is designed to be installed by screwing together. In addition to the inlet port 45 to which the conduit 6 from the electromagnetic switching valve 2 is connected, the bottle holder 56 has an air vent valve 1 biased in the closing direction by a spring 16.
7 and a valve stem 57 for hanging into the oil collection bottle 5. The valve stem 57 slidably passes through a vertical shaft hole 58 provided in the center of the bottle holder 56.
An introduction oil passage 59 along the valve stem axis, a relay port 60 that is opened at the upper end side of the oil passage and communicates with the inlet port 45 at the upper limit position of the valve stem 57, and an intermediate part of the valve stem 57. and insert the introduction oil path 59 into the oil collection bottle 5.
It has an outlet port 61 that communicates with the inside. The valve stem 57 is constantly urged downward by a spring 62. For this reason, a stopper 63 is provided at the outer end of the valve stem 57 protruding from the top surface of the bottle holder 56 to set the lowering limit position of the valve stem. A float valve 64 that slides up and down along the valve stem 57 is held therein. The float valve 64 closes the outlet port 61 when the amount of oil introduced into the oil sampling bottle 5 reaches a fixed amount. Therefore, a float upper limit stopper 65 is provided on the valve stem 57 to set the upper limit position of the float valve 64 (closed position of the outlet port 61).
A lower limit stopper 66 for preventing the float valve from coming off is provided at a position spaced below the outlet port 61. The valve rod 57 is pushed up by the inner bottom of the oil sampling bottle 5 attached to the bottle holder 56 and held at the upper limit position where the relay port 60 coincidentally communicates with the inlet port 45 . On the other hand, the electromagnetic switching valve 2 has an electromagnetic coil 2 on one end side.
The valve a opens when a control signal from the time integration mechanism 8 is input, and closes by the spool spring 2b at the other end when the signal is cut off. The time accumulation mechanism 8 accumulates the actual operating time of a working machine equipped with the hydraulic line 1, for example, a construction machine such as a loader or a tractor, and when the accumulated time reaches a preset time, the electromagnetic switching valve 2 outputs a control signal. The number of pulses of the control signal is set in advance so that it is output only during a time period until the amount of oil introduced into the oil collection bottle 5 reaches a fixed amount. When the electromagnetic switching valve 2 is opened in response to a control signal from the time integration mechanism 8, the oil pressure from the hydraulic line 1 passes through the inlet port 45, the relay port 60, the introduction oil path 59, and the outlet port 61 in order. It is introduced into the bottle 5. When the amount of introduced oil in the oil collection bottle 5 gradually increases and reaches the float valve 64, the float valve starts floating and closes the outlet port 61 when the amount of introduced oil reaches a fixed amount. In this way, a fixed amount of sample oil is introduced and stored in the oil sampling bottle 5, and the bottle is removed at an appropriate time. When removing the valve stem 57, the spring 62
It descends following the oil sampling bottle 5 with a tension of . As a result, the relay port 60 of the valve stem is connected to the shaft hole 5.
8 and is blocked, there is a risk that when the oil sampling bottle is completely removed, the float valve 64 will fall under its own weight and the pressure oil will flow out from the outlet port 61 even if it is opened. There isn't. In the modification shown in FIG. 2, a bottle holder 56' that removably suspends the mouth of the oil sampling bottle 5 and a valve stem 67 are shown.
are integrated into one. In this case, the valve stem 67 is composed of a sleeve shaft integrally vertically disposed at the center of the bottle holder 56', and forms an introduction oil passage 59' leading to the inlet port 45', and also forms an introduction oil passage 59' that communicates with the inlet port 45'. It has an outlet port 68 that opens at a constant volume position. The valve stem 67 has a sleeve valve 69 fitted on the upper side that moves up and down, and a float valve 70 that slides on the lower side. The sleeve valve 69 has an outward flange 69a provided with an air hole 69b, and is always urged downward by a spring 71 interposed between the flange and the inner lower surface of the bottle holder 56'. When the oil collection bottle 5 is attached to the holder, the flange 69a is held against the spring 71 at the open end of the bottle. On the other hand, the float valve 70 consists of a valve body 70a that is fitted into the valve stem 67 and slides, and a float 70c that is integrally connected to the valve body via a suspension rod 70b, and is provided at the hanging end of the valve stem 67. Stopper 67
The position where the valve body 70a is held at the position a is defined as the lower limit position, and the outlet port 68 is opened at this position, and the position where the valve element abuts against the hanging end of the sleeve valve 69 is defined as the upper limit position. is starting to close. When the electromagnetic switching valve 2 is opened in response to a control signal from the time integration mechanism 8, the pressure oil sent from the hydraulic line 1 into the introduction oil passage 59' via the inlet port 45' is transferred to the outlet port 68. Oil extraction bottle 5
flow inside. When the amount of oil introduced into the oil sampling bottle gradually increases and reaches the float 70c, the valve body 70a integrated with the float rises along the valve stem 67 in order to float the float. When the amount of oil in the oil sampling bottle reaches a fixed amount, the valve body 7
0a abuts the depending end of sleeve valve 69 and completely blocks outlet port 68. In this way, when the oil collection bottle into which a fixed amount of sample oil has been introduced is removed, the sleeve valve 69 descends and blocks the outlet boat 68, so that pressure oil does not flow out from the outlet port when the bottle is removed. do not have. 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 that sensor. good. Further, the upper rail 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 electromagnetic switching valve. In this case, an alarm signal may be generated when sampling ends.

【Effect of the invention】

As described above, in this invention, when the amount of sample oil introduced into the oil sampling bottle from the hydraulic line reaches a fixed amount when the electromagnetic switching valve is opened, the introduction of the sample oil into the bottle is stopped by the float valve at that point. Since the system is automatically shut off, there is no need to interrupt the operation of the machine during this type of sampling, as was the case in the past. Furthermore, the sample oil in the oil sampling bottle can be easily recovered by removing the oil sampling bottle from the bottle holder at a convenient time. In addition, even when collecting sample oil, the inlet port connected to the hydraulic line and the outlet port that discharges the oil introduced from the inlet port are automatically closed, so residual oil in the sample oil introduction system leaks to the outside. There is no fear of doing so. In particular, according to this invention, since the amount of oil introduced into the collection bottle is automatically set by the float valve as described above, the opening time of the electromagnetic switching valve is dependent on the viscosity of the oil, flow rate, etc. Even if it is not set, there is an advantage that it is possible to automatically dispense a fixed amount of oil. Therefore, the present invention is highly effective for regular or periodic oil analysis of operating machines equipped with hydraulic lines.
This will greatly contribute to improving the maintenance and management of this type of oil.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an automatic oil extraction device according to a preferred embodiment of the present invention, and FIG. 2 is a sectional view of an automatic oil extraction device according to another embodiment of the invention. 1...Hydraulic line, 2...Solenoid switching valve, 5...
Oil extraction bottle, 45, 45'...Inlet port, 56,
56'... Bottle holder, 57, 67... Valve stem,
59, 59'... Introductory oil path, 61, 68... Outlet port, 64, 70... Float valve.

Claims (1)

[Scope of Claims] 1. A device for automatically collecting sample oil from a hydraulic line of a machine that operates with a hydraulic line, comprising: a bottle holder having an inlet port connected to the hydraulic line via an electromagnetic switching valve; an oil sampling bottle that is detachably attached to the bottle holder; and an oil sampling bottle that is provided on the oil sampling bottle holder and forms an oil introduction path from an inlet port of the oil sampling bottle that hangs inside the sampling bottle; a valve stem in which an outlet port of the introduction oil passage is formed, which opens at a constant volume position in the sampling bottle; When the float valve is closed and the oil sampling bottle is removed, the spring force of the spring that had been compressed by the oil sampling bottle is released, and the means for blocking the inlet port or the outlet port is blocked by this released spring force. An automatic oil extraction device characterized by comprising a closing mechanism that slides into position. 2 In the closing mechanism, the valve stem is inserted through the bottle holder so as to be able to slide up and down, and is constantly urged in the downward direction by a spring, and when the oil sampling bottle is attached to the bottle holder, the oil sampling bottle pushes up against the spring and is introduced. Automatic oil extraction according to claim 1, characterized in that the oil passage is held in a position communicating with the inlet port, and is pressed down by a spring to close the inlet port when the oil extraction bottle is removed. Device. 3. The closing mechanism has a valve stem that is integrally hung on the bottle holder, and a sleeve valve that is always urged in the downward direction by a spring is fitted on the outside, and when the oil sampling bottle is attached to the bottle holder, the sleeve is closed with the external oil sampling bottle. Claim 1, characterized in that the valve is pushed up and held at the outlet port open position against a spring, and the sleeve valve is moved downwardly by the spring to the outlet port closed position when the oil sampling bottle is removed. Automatic oil extraction device according to item 1. 4. The automatic oil extraction device according to claim 1, wherein the valve stem has a stopper function to stop the float valve at the outlet port closed position.