JPH059360Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an oil supply device suitable for removing air from a hydraulic circuit.

[Conventional technology]

Repairs, inspections, etc. in hydraulic circuits of machine tools, etc.
Once the oil has been drained due to parts replacement, etc., in order to discharge internal air, dirt, etc., oil is continuously supplied from the oil tank to the end of the hydraulic circuit, and the oil overflows from the air bleeder. ” needs to be done.

The feeding device used at this time is generally
As shown in Fig. 3, the oil supply port 1a of the oil tank 1 and the hydraulic circuit 2 are connected via a pump 3 with a pipe 4, and a discharge pipe 6 is connected to the hydraulic circuit 2 at the uppermost point. An air bleeder 5 as shown in FIG. 4 is installed.

When air is removed using the above device, the fourth
As shown in Figure B, first loosen the air bleeder 5, open the hydraulic circuit 2 to the atmosphere through its communicating vertical hole 5a, and after filling the oil tank 1 with oil up to the upper limit (UP), operate the pump 3. The oil containing air and dirt is discharged from the communicating vertical hole 5a of the air bleeder 5 and collected in the drain oil receiver B via the discharge pipe 6. And the oil is in oil tank 1
When the oil has decreased to the lower limit (LOW), replenish the oil to the upper limit.

Next, the above operation is repeated until there is no air or dirt in the oil from the discharge pipe 6.Finally, as shown in FIG. After making circuit 2 a closed circuit, the upper limit (UP) of the oil tank
Add oil to level and complete the job.

In addition, as an oil filling device for this type of hydraulic equipment, Japanese Patent Application Laid-Open No. 174496/1987 discloses an oil suction pipe connected to a pipe communicating with an oil tank via a flow rate regulating valve, and an oil suction pipe communicating with a vacuum pump. and in parallel with an air discharge pipe having a leak screw,
It has been disclosed that the suction pipe and the discharge pipe are connected to a lubricating port of a required device via an adapter.

[Problem that the invention attempts to solve]

In the conventional device as described above, in the former case, when the oil tank 1 is a high pressure tank made of iron or the like, an oil pressure feed pipe 8 is connected to the cap 7 with an oil pressure feed device (not shown in FIG. 2). Attach and screw together the cap 7 and the mouth of the oil tank 1, tighten this and send oil from the oil pressure feeding device, pressurize the inside of the oil tank 1 with the oil pressure feed pipe 8 and force feed it. If the oil tank 1 is a low pressure tank made of synthetic resin,
Oil cannot be pumped as in the case of the high pressure tank mentioned above.

Therefore, the pump 3 sends oil, but it is not efficient to rotate the pump 3 with air, dirt, etc. inside it, and it is not preferable in terms of maintaining performance. Moreover, the oil pressure does not rise when the pump 3 rotates, and not only is it not possible to remove air and dirt sufficiently, but it often takes a long time to bleed the air. Furthermore, since it is necessary to supply oil to the upper limit in the oil tank 1 while air is being bleed, there is a drawback that it requires a lot of manual labor during air bleed.

Furthermore, in the invention disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 59-174496, the air discharge pipe communicating with the vacuum pump is arranged in parallel with the oil suction pipe, so the structure is complicated.
Since it requires a vacuum pump, it is not only large-scale and expensive, but also has various problems such as the fact that vacuum pressure cannot be applied if the oil tank is a low-pressure tank.

[Means for solving problems]

The present invention solves the conventional problems as mentioned above,
Even if the oil tank is a low-pressure tank, the oil can be pumped into the hydraulic system from the pipe line excluding the oil tank to the hydraulic circuit, reducing air bleeding time.
The purpose of this device is to provide an oil supply device with a simple structure that automatically loads oil into an oil tank. An insertion tube that is fitted into the supply port, a seal portion that tightly covers the oil supply port with a set pressure from a spring provided at the tip of the insertion tube, a cap that is connected to an oil tank that supports the insertion tube, and the insertion tube. It consists of an oil supply device connected to the pipe, and the set pressure of the seal part by the spring is set to the pressure at which the seal part rises due to the oil pressure in the pipe line from the oil supply device to the hydraulic circuit when the air bleeder is closed. The oil supply device is characterized by:

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in FIGS. 1 and 2. It should be noted that reference numerals in the drawings that are not particularly explained will be explained as indicating the same things as those in FIG. 3.

Reference numeral 11 designates a low-pressure oil tank made of synthetic resin, and has an oil supply port 11a formed at its bottom, and a threaded portion 11c formed at its upper opening 11b to which a cap 15, which will be described later, is screwed. .

Reference numeral 12 denotes an insertion tube made of a steel pipe or the like, which has a diameter large enough to fit into the oil supply port 11a, and is attached to the cap 15 by passing through it. Further, near the tip of the insertion tube 12, a sealing member 14 is provided on the lower surface of the cap-shaped body 14a.
A seal portion 14 having a fixed portion b is tightly and slidably fitted into the cap-shaped body 14a and a spring 13 having both ends fixed to a spring receiver 18 fixed midway through the insertion tube 12. It is always pressed downward in FIG. The set pressure of the spring 13, that is, the spring pressure when the seal portion 14 is pressed against the upper end of the oil supply port 11a of the oil tank 11, is the same as the oil supply when the air bleeder 5 is closed, as shown in FIG. The pressure is set to such an extent that the seal portion 14 is raised by the oil pressure in the conduit from the device 17 to the hydraulic circuit 2.

19 is the cap 1 parallel to the insertion tube 12.
The upper end of the oil tank level detection switch 5 is connected to a pump motor of an oil feed pipe 17, which will be described later. Reference numeral 17 denotes an oil feeding device connected to the insertion tube 12 by a pressure feeding pipe 16, and includes a large capacity oil tank, an electric oil pump, and a hydraulic pressure adjustment mechanism.

In the oil supply device of the present invention having the above-described structure, the insertion tube 12 and the oil tank level detection switch 19 attached to the cap 15 are inserted into the oil tank 11 by holding the cap 15.

Then, insert the tip of the insertion tube 12 into the oil supply port 11a, and align the seal member 14b of the seal portion 14 with the upper end of the oil supply port 11a,
The cap 15 is placed over the mouth 11b of the oil tank 11, and screwed onto the threaded portion 11c and tightened.

As a result, the seal portion 14 is applied with the set pressure by the spring 13 to the oil supply port 11a.
Since the upper end is tightly covered, the air bleeder 5 is now turned to loosen it as shown in FIG. It is sent directly to the pipe 4 via the pump 3 and then to the hydraulic circuit 2.

Then, as described above, oil mixed with air and dirt flows out from the air bleeder 5 through the discharge pipe 6 to the drain oil receiver B, and eventually clean oil that is free from air and dirt is discharged. will be done. Therefore, as shown in FIG. 4A, when the air bleeder 5 is tightened, the oil pressure in the hydraulic circuit 2 and the pipe 4 increases, and this oil pressure causes the seal portion 14 to rise.
The force received by the spring 13 becomes higher than the set pressure of the spring 13. As a result, the seal part 14 rises against the spring 13, and a gap is created between the seal part 14 and the upper end of the oil supply port 11a, and the oil is poured into the oil tank 11.
overflow inside.

When this oil reaches the upper limit level (UP), the oil tank level detection switch 1 is activated.
9 is closed, and the electric oil pump of the oil supply device 17 is stopped. After that, remove the cap 15 from the mouth 11b of the oil tank 11, and insert the insertion tube 12, the seal part 14, and the oil tank level detection switch 1.
9 from inside the oil tank 11, and attach the other cap (not shown) to the mouth 11b of the oil tank 11.
If you put it on, screw it into the threaded part 11c and tighten it,
Air bleeding and oil filling into the oil tank 11 are completed at the same time.

[Effect of idea]

As described above, the oil supply device according to the present invention has the following features:
an insertion tube fitted into an oil supply port at the bottom of an oil tank that is connected to a hydraulic circuit equipped with an air bleeder; a seal portion that tightly covers the oil supply port with a set pressure from a spring provided at the tip of the insertion tube; It consists of a cap connected to an oil tank that supports the insertion tube, and an oil supply device connected to the insertion tube, and transmits the set pressure of the seal portion by the spring from the oil supply device to the hydraulic circuit when the air bleeder is closed. Since the seal part is set to a pressure that rises due to the hydraulic pressure in the pipeline, a low pressure tank can be used as the oil tank, and air bleeding can be done in a short time without requiring manual labor. It can be completed with certainty.

In addition, the oil tank can be filled with oil automatically after the air has been removed without getting your hands dirty with oil, and since the oil can be pumped, not only air but also dirt can be reliably removed. is,
Accurate operation and extended life of the hydraulic circuit can be achieved.

Furthermore, by providing the oil tank level detection switch in the cap, there are various effects such as the ability to automate the filling of a predetermined amount of oil into the oil tank after the completion of air bleeding.

[Brief explanation of drawings]

Fig. 1 is an overall schematic diagram of the oil supply device according to the present invention, Fig. 2 is a perspective view of the main parts, Fig. 3 is an overall schematic diagram of a conventional oil supply device, and Fig. 4 A and B are air bleeders. FIG. 1, 11...Oil tank, 1a, 11a...
Oil supply port, 2...hydraulic circuit, 4...pipe,
5...Air bleeder, 6...Discharge pipe, 7,1
5... Cap, 12... Insertion tube, 13... Spring, 14... Seal part, 14a... Cap-like body, 14b... Seal member, 16... Pressure feeding pipe, 17... Oil feeding device, 18... ...Spring receiver, 19
...Oil tank level detection switch.

Claims (1)

[Claims for Utility Model Registration] (1) An insertion tube that is fitted into an oil supply port at the bottom of an oil tank connected to a hydraulic circuit equipped with an air bleeder, and a spring provided at the tip of the insertion tube to supply the oil. It consists of a seal that tightly covers the supply port, a cap that is connected to an oil tank that supports the insertion tube, and an oil supply device that is connected to the insertion tube. An oil supply device characterized in that the oil supply device is set to a pressure that causes a seal portion to rise due to the oil pressure in the pipe from the oil feed device to the hydraulic circuit when the oil supply device is closed. (2) The oil supply device according to claim 1, wherein the cap is provided with an oil tank level detection switch.