JPS6271752A - Method for venting air from brake oil in hydraulic brake operating circuit - Google Patents

Abstract

PURPOSE:To reduce substantially the number of air venting operators while reducing substantially operation time by forcibly pouring brake oil into a hydraulic brake operating circuit from the outside through a pump to discharge securely quickly air in said circuit. CONSTITUTION:An oil flow path A or B is selected into which brake oil is poured from an oil tank 29 by driving a pump 31 to forcibly flow a sufficient flow amount to vent air from a congestion spot. And a process for circulating this brake oil together with air to the oil tank 29 is repeated over the whole oil flow paths A, B. Or stopper valves 20-23 are opened to flow forcibly brake oil into the oil flow paths A and B simultaneously. And after the completion of air venting operation, stopper valves 20, 21 are closed and stopper valves 22-25 are closed, and units of the apparatus are disengaged from each other by quick joints 27, 36. As a result, the number of air venting operators can be substantially reduced to shorten substantially operating time.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for removing air mixed in brake oil sealed in a hydraulic brake operating circuit.

(Prior Art) If there is a large-diameter portion or an upwardly bent portion in the middle of a piping path, air sealed together with brake oil in a hydraulic brake circuit stagnates in that portion.

This accumulated air becomes minute bubbles due to the flow impact force of the brake oil and mixes into the brake oil.

As the brake oil flows, these microbubbles also flow in the piping, so once the brake oil is discharged out of the circuit, the mixed air is also discharged out of the circuit together with the brake oil.

In view of this, conventionally, the end of the rear stage of the brake section of the hydraulic brake operating circuit is placed at the bottom, a discharge valve is provided at the end of this circuit, and an oil cup is provided at the top of the circuit, and the discharge valve is installed at the bottom. In the open state, the master cylinder for generating brake hydraulic oil is manually driven to flow the brake oil in the circuit to the discharge valve side, and the brake oil discharged from the discharge valve is refilled into the oil cup to perform brake air removal work. This was done every time.

(Problems to be Solved by the Invention) However, in such a conventional method, several workers are required to perform the air removal work continuously. The master cylinder only needs to have a discharge volume that can operate the brake cylinder in one stroke, so the discharge volume must be small, and the air that remains in large diameter parts in the middle of the piping path will have a low flow rate of brake oil. Because it is difficult to get out of the place where it is stuck, it takes a considerable amount of time to complete the work.

For example, in an overhead crane with a crane span of 40 m and two brake sections, there is a problem in that it takes five people about three hours to efficiently bleed air using the conventional method.

(Means for Solving the Problems) A method for removing air from brake oil in a hydraulic brake operating circuit according to the present invention includes providing a stop valve in the circuit, and one oil passage covering the entire circuit or the stop valve. The brake oil inlet and outlet are located at positions where multiple oil flow paths can be selected by switching.
The feature is that the oil flow path is selected and brake oil is injected into the selected oil flow path from outside using a pump and forced to flow.With this configuration, the number of workers can be significantly reduced, and the work can be done easily. This makes it possible to significantly shorten the time.

(Example) A hydraulic brake operating circuit and an air bleed device for implementing the present invention will be described below with reference to the drawings.

In the figure, reference numerals 1 and 2 indicate a set of two brake cylinders. Brake shoes 3 and 4 are attached to the rod ends of the cylinders 1 and 2, and a disc 7 is rotated by electric motors 5 and 6.
．． A brake unit is configured to decelerate or stop the 8. The brake cylinders 1 and 2 are connected in series by a pipe 9.

Reference numeral 10.11 denotes a master cylinder for remote control operation and manual operation, which is connected to the brake cylinders 1 and 2 through a switching valve 12 and a pipe 16 so as to be able to supply brake operating hydraulic pressure.

14 is an oil cup, a pipe 15 and its branch pipe 16.
17, it is connected to the brake cylinders 1 and 2 so that brake oil can be supplied thereto.

Reference numeral 18 denotes an oil tank, to which piping 15, 16 or 17 (in the illustrated example, piping 16) communicates via piping 19 so that excess oil can be discharged.

20.21.22, 23, 24.25 are stop valves, and the stop valve 20.21 is provided in the pipe 9 at the end of the circuits 1 to 19 as described above, and the pipe 15° 16.17
．． 19 is provided with stop valves 22, 25, 24°25.

Reference numeral 26 denotes a piping for air bleed and oil injection, which is detachably connected to the piping 15, 16 or 17 between the stop valve 22 and 23, 24 by a quick joint 27. This piping 2
6 is provided with a pump 31 driven by the electric motor 28 to suck up the brake oil in the oil tank 29 through the strainer 3o, and the pipe 26 is equipped with a pressure regulating valve 32 and a line filter 33. A pressure gauge 34 is connected thereto.

Reference numeral 35 denotes an air bleed and oil discharge pipe, which is detachably connected to the pipe 9 between the stop valves 20 and 21 by a quick joint 36, and in this connected state, the pipe 9 communicates with the oil tank 29.

In this way, the air bleed devices 26 to 36 are configured,
The main parts 26, 28 to 35 of the apparatus are mounted on a frame (not shown) and made into a portable unit for common use by a plurality of hydraulic brake operating circuits. In this air bleed device, while the stop valves 22 and 25 are closed, the switching valve 12 is switched to the a position, and
When the stop valve 21.23 is closed and the stop valve 20.24 is opened, an oil flow path A passing through the brake cylinder 1 is formed, or conversely, the switching valve 12 is switched to position b. At the same time, the stop valves 21.23 are opened, and the stop valves 20.23 are opened.
When 24 is closed, an oil flow path B passing through the brake cylinder 2 is formed. As described above, the circuits 1 to 19 are covered by the two oil flow paths A and B, which can be selected as appropriate by the valve switching operation.

In the present invention, the oil flow path A or B is selected, and the brake oil in the oil tank 29 is injected into the selected oil flow path by driving the pump 31, so that the brake oil sufficient to draw out air from the stagnation area is injected into the selected oil flow path. The process of forcing the brake oil to flow at a flow rate and causing the brake oil in the oil flow path to flow back into the oil tank 29 is repeated for all oil flow paths A and B.

Alternatively, the stop valves 20, 21, 22, and 25 are opened to forcibly flow the brake oil into the oil passages A and B at the same time. If there is one brake unit instead of two as described above, the stop valve 20 (21) is opened and operated to form the oil flow path A (B), and the brake oil is forced to flow into the flow path. . After completing the air bleeding work using the above procedure, close the stop valves 20.21, open the stop valves 22, 25, 24, and 25, and disconnect the device unit using the quick couplings 27.56. be.

As described above, the present invention injects brake oil into the hydraulic brake operating circuit from the outside using a pump and forces it to flow, so that the air mixed in the circuit can be reliably and quickly discharged. It is possible to significantly reduce the number of personnel and work hours. By the way, one person
It can be done in about 15 minutes.

[Brief explanation of drawings]

The drawing is a schematic diagram showing a hydraulic brake operating circuit and an air bleed device for implementing the present invention. 1.2・Φ brake cylinder, 9, 13, 15,
16゜17.19,26,35...Piping, 10,11
-・Master cylinder, 12・・Switching valve, 20, 21,
22゜23.24,25...stop valve, 27
．． 36-・Rapid coupling, 28・・Electric motor, 29・・Oil tank, 30・・Strainer, 31・・Pump, 32・
・Pressure regulating valve, 33... Line filter, 34...
Pressure gauge.

Claims (1)

[Claims] A stop valve is provided in the hydraulic brake operating circuit, and
Brake oil injection and discharge parts are provided at positions where one oil flow path covering the entire circuit or a plurality of oil flow paths can be selected by switching the stop valve, and the oil flow path is selected; A method for removing air from brake oil in a hydraulic brake operating circuit, characterized by injecting brake oil into the selected oil flow path from the outside using a pump and forcing it to flow.