JPS58207502A - Pneumatic-hydraulic apparatus - Google Patents

Abstract

PURPOSE:To prevent mixing of air into oil and prevent damage of lead wire by installing a guide member for guiding a free float and a position detection switch in the inside of the tubes of a pneumatic-hydraulic converter. CONSTITUTION:Free floats 21 and 41 are installed in the tubes 65 and 75 in pneumatic-hydraulic converters 19 and 39. Pressurized air is supplied into an air chamber 25 from an air source 10, and then a free float 21 shifts downward, and oil is supplied through a conduit 37 from an oil chamber 26 to shift a piston 57 in the A direction. At the same time, the oil in a cylinder chamber 60 flows into an oil chamber 46, and the free float 41 is shifted upward, and a magnet 42 operates a lead switch 43. When the switch 43 operates, a solenoid 35 is operated, and the oil in the oil chamber 26 is reduced by a variable throttle valve 30, and a small quantity of oil flows, and the piston 57 performs delayed motion.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an air-hydraulic system for use in machine tools such as lathes.
Regarding this.

Conventionally, it consists of an air-hydro converter that converts pressurized air supplied from an air source such as a compressor, air reservoir, or pressure accumulator into pressure oil and outputs it, and an operating cylinder that is operated by the pressure oil from the air-hydro converter. BACKGROUND OF THE INVENTION It is known to use air-hydraulic systems to effect a feed motion on a workpiece via a piston orifice.

FIG. 1 shows such a conventional air-hydraulic device.
1 is an air source, 2 is a 4-port solenoid valve, 3.4 is an air-hydro converter, 5 and 6 are free floats, 7 is an operating cylinder, and 8a and 8b are reed switches for position detection. Regarding its operation, for example, when pressurized air is sent from the air source 1 through the 4-port electric af2, the free float 5 of the air-hydro converter 3 moves and the pressure oil of the air-hydro converter 3 is transferred to the operating cylinder 7. The piston 7c moves to the right, and at the same time the oil in the cylinder chamber 7b is discharged to the mini anhydro converter 4, and is discharged to the air in the aerohydro converter 4 via the four-boat solenoid valve 2. . A ring-shaped ferrite magnet is provided in the piston 7c of the operating cylinder 7, and when the piston 7c moves and activates the I-need switch 8b provided on the outside of the operating cylinder 7, a 4. f? - Activate the solenoid valve 2, cut the square, and send pressurized air to the air hydro converter 4, operate/piston 7 of cylinder 7.
Move c in the opposite direction.

In this way, in the conventional air-hydraulic system, the main body of the operating cylinder 7 is equipped with switches sa and sb, and when the operating cylinder 7 is powered during the work area, it can be used for cutting. Due to the bad atmosphere of LF+ with flying debris and loose oil, problems such as the reed switch's reed operation being damaged and running, or the reed switch becoming dirty with oil and making it malfunction, can occur. For example, when pressurized air is being supplied to the air-hydro converter 3, or when the piston 7c is repeatedly feeding the load at low speed or slow speed, the free float 5 for preventing air mixture is tilted, and the air becomes bubbles and the oil becomes oily. There was a problem that the piston 7c could not be smoothly driven.

The invention solves these problems and installs a reed switch for position detection on the side of the air-hydro converter, allowing the reed switch to be installed in a good atmosphere and preventing damage to the lead wire. - An air-hydraulic device that prevents the free float from tilting, prevents air from entering the oil, and drives the operating cylinder as desired by providing a guide member inside the tube of the converter to guide the free float. The purpose is to provide

Hereinafter, the present invention will be explained in Section 7-1 based on the illustrated embodiments.

Figures 2 to 7 show the first example of non-invention.
In the figure, 10 is an air source such as a console, air filter, air quality, etc., 11 is an air filter, 12 is a pressure reducing valve, 13 is an air pipe, 14.15 is a branched air pipe, and 16 is a 4-boat sleeper. Valve, 17 is lunoid, 18 is air pipe, 19.39
20.40 is an air-hydro converter that supplies pressurized air from air source 1 as pressure oil, and 20.40 is tube 6.
5, (see Figures 3 and 49), 75 □ (see Figures 6 and 7) Free flow 421.
22.42 is a ring-shaped ferrite magnet provided on the free float 21.41, 23.43 is a reed switch for position detection, 2
4.44 is the lead wire, 25.45 is the air chamber, 26.46
is an oil chamber, and 27.28.2'9, 47, and 48.49 are holes and grooves. 30 is a variable valve; 31.
50/i air operated square, 32.37,. 52 is oil road, 3
3゜51.53 is air pipe line, 34.54 is 3-port solenoid valve, 35 + 55 is valve, noid, 36 is air operated valve - 238 is air pipe line, 56 i'l operation cylinder, 5
7 is a piston, 58 is a piston rod, 59.60 is a cylinder chamber, 611 is a control panel, 62, 63.64 is wiring 2, and 65.75 is a hydraulic converter Df.

-p, 66.76 (3rd, 67th figure reference),
・Yunden j167.774 Yo Lead Sui, Chi23
, 43 ,) Fixing screws for the mounting members 68 and 78, 69
．． = Conical box of 7P36, 70 (5th ward i cicada) is connected to katsu g9 box 30 and air operated valve 31.36, :) Kohe oil pipe 2.71 is connected to hole 72 of lid 73. Set up a summer income shift”
i-31) hole, 74.79 is the pneumatically operated de-31. '50
Adjust the mounting members 68 and 78 of the reed switch 23 + 43 to the appropriate position for operation using the fixing screws 67 and 77. Also, the valve 80 of the variable throttle valve 30 is fixed.
The piston 57 (see FIG. 5) is adjusted and fixed at a position suitable for slow feeding or transport.

The configuration of the first embodiment of the present invention has been described above, and now its operation will be described. Now, when the conical valves 69, 74, and 79 shown in FIGS. 3 and 6 are opened from the closed state, the circuit diagram becomes as shown in FIG. 2. In the state shown in FIG. 2, the piston 57 is moving in the direction of arrow A, and pressurized air is supplied from the air source 10 from 10→11→12→13→14→16→18→2.
5, the free float 21 moves downward, and oil is sent from the oil chamber 26 to 26→30→32 and 26→27.
・Flow as 28 → 29 → 31 → 32, then 32 → 36 → 3
The flow progresses from 7 to 59, and the piston 57 is fast-forwarded. At this time, the oil in the cylinder chamber 60 simultaneously changes from 60 → 52 → 50 → 4
The free float 41 moves upward, and the ferrite magnet 42 operates the reed switch 43. At this time, of course, the air in the air chamber 45 flows from 45 to 38 to 16 and is discharged. As mentioned above, when the reed switch 43 is activated, a signal is sent to the control panel 61 via the lead wire 44, and the wiring 6 is sent from the control panel 61 to the control panel 61.
3, the solenoid 35 is activated, the 3-port solenoid valve 34 is switched, the air from the air line 15 is cut off, and the air-operated valve 31 is closed, that is, the air-operated valve 3
The conical valve 69 of 6 is open and the conical square 74 of the air operated valve 31 is closed, and the oil in the oil chamber 26 is 26 → 72 → 71 → 30 → 32
→ 36 → 37 → 59 A small amount of flow is throttled by the square 30, and the piston 57 is transported. If the workpiece attached to the piston rod 58 of the piston 57 is cleared during this transport, it will be cut. Processed. As the piston 57 moves, the free float 21 further moves down the tube 65A, and when the reed switch 23 is actuated by the ferrite magnet 22, the lead wire 24 is valved and a signal is sent to the control panel 61. The solenoid 35.55 of the 3-port hexagonal valve 34.54 is
A signal is sent to the 3-boat tortoise valve '34'54, which causes the air-operated valve 36 and the air-operated valve 3 to switch.
Air is no longer sent from the air pipe line 15 to 1.50,
Conical valve 69 and conical valve 74.79 are closed, the oil supply to operating sheathing 56 is cut off and piston 57 is stopped. Here, when the timer of the control panel 61 is activated and a signal is sent to the wiring 62, '63.64, the solenoid 17 is activated and the 4-port solenoid valve 16 is switched, simultaneously
．． 1? - Solenoid valve 34.54 is also switched, conical valve 74
, 69.79 are opened, and the pressurized air from the air source 10 flows from 10→11→12→13→14→16→38→45. As a result, the free float 41 descends, the oil in the oil chamber 46 flows from 46→47/48→50→52→60, and the oil in the cylinder chamber 59 flows from 59→37→36→32, and further from 32→ 30→26 and 32→31→29→
Flows from 27/28 to 26. Here, the air in the air chamber 25 flows in the order 25→18→16 and is exhausted.

At this time, the piston 57 is rapidly moved in the direction of arrow B.

Then, a limit switch (not shown) attached to the machine tool operates, and a signal is sent to the control panel 61.
A signal is sent from the control panel 61 to the controller 62°63, which switches the 3-port switching valves 34 and 54, and closes the conical valves 69 and 74°79 as shown in FIGS. Then, since each cell is closed, the free float 21 + 41 and the piston 57 stop. Can you operate it in this state? Tongue (not shown)
When you press and send a signal to the control panel 61, the signal is sent from the wiring @62゜63 to the 3-port solenoid valve 34, 54 and switched, and at the same time a signal is sent to the wiring 64, and the 4-port solenoid valve 16 is also switched. Switch. Subsequently, the air-operated valves 31, 50 and the switching valve 36 are opened by the pressurized air from the metal air source 1, and the circuit returns to the 2'1A circuit state that was initially carried.

In the operation explained above, air-hydro converter 19
, Since a cylindrical member 20.40 serving as a guide member is provided inside the Q-pro 5.75 of 3'9, the free float 2
1.41ζ Ferrite magnet that is guided smoothly without twisting and has free float 2L, 4], 22,4
2 operates the position switch 23.43. Also, in this configuration, free flow) 24.4
Ring-shaped ferrite magnets 22 and 4 provided in 1
2 may be attached to the inner side of the upper surface of the free float as shown in FIG. 2, or may be attached to the inner side of the lower surface of the free float as shown in FIG. Furthermore, it may be attached to the entire surface of one side of the free float as shown in FIG. 8, which will be described later. In the first embodiment, the number of reed switches is 19 for each air-hydro converter.
, 39 has been described, but it goes without saying that several pieces may be provided as necessary.

Next, a second embodiment will be described with reference to FIG. 1st
The same members as in the embodiment are indicated by the same reference numerals. Inside the tubes of the air-hydro converters 19 and 39, rod-shaped or gib-shaped guide members 20' and 40' are provided, and a reed switch 23' .

43' Air hydro converter 19. It is provided on the outside of the tube of 39. The other configurations are the same as in the first embodiment, and the operation is also the same. Air-hydro converter 1
9,39 on the outside of the tube.

Since a large number of air/hydro converters 19 and 19 are provided, it is possible to provide a large number of air/hydro converters 19 or 19 scattered around the air/hydro converter 19 with a phase shift around the air/hydro converter. For example, it is also possible to provide a large number of reed switches in addition to one reed switch only in 39.

Although the embodiments of the present invention have been described above, the present invention has the following advantages. That is, since the guide member is housed inside the tube of the air/hydro converter and the free float is slid along the guide member, it is possible to move the free float smoothly to the 9th column, which makes the operation easier. The cylinder can be smoothly fed. II
-Y switch all air/・・1゛dro converter iro 11
Since it is installed on the operation cylinder side, it creates a better atmosphere than the conventional one installed on the operation cylinder side.
- Malfunctions due to oil stains on the switch can be prevented. Further, by changing the ratio of the piston surface type of the operation 7 ring to the surface type of the air-hydro converter, the precision of the detection position can be increased. Furthermore, when a reed switch is provided outside the tube of the air-hydro converter, a large number of reed switches can be provided around the reed switch with a phase shift and scattered, so that fine operation control can be performed.

[Brief explanation of drawings]

FIG. 1 is an air-hydraulic circuit diagram of a conventional air-hydraulic system, FIGS. 2 to 8 show the air-hydraulic system of the present invention, FIG. 2 is an air-hydraulic circuit diagram of the first embodiment, and FIG. Figure 4 is a cross-sectional view of the air-hydro converter, Figure 4 is a cross-sectional view taken along the line ■-■ in Figure 3, and Figure 5 is a partially cutaway cross-sectional view of the variable throttle valve section taken along the line ■-v in Figure 3. , FIG. 6 is a cross-sectional view of the air-hydro converter, FIG. 7 is a cross-sectional view taken along the line ■--■ in FIG. 6, and FIG. 8 is an air-hydraulic circuit diagram of the second embodiment. DESCRIPTION OF SYMBOLS 10... Air source, 16... 4-port solenoid valve, 19° 39... Air-hydro converter, 20,4o... Cylindrical guide member, 20', 40'... Guide member, 21.4
1...Free float, 22, 42, 22',
42. '...Ferrite magnet, 23, 43
, 23', 43'... Reed switch, 56 ・
Operation Cylinder Agent Patent Attorney Makoto Monichi
1 Figure 1 7 Figure 2? 8 Figure 4 Figure 5/υ 71

Claims (1)

[Scope of Claims] (1) An air-hydraulic system comprising an air pressure converter that converts air pressure into hydraulic pressure, and an operating cylinder operated by hydraulic pressure from the air pressure converter, comprising: - A guide member and a ring-shaped free float that slides along the guide member are provided inside the guide member, and a reed switch for position detection is disposed inside the guide member, and a reed switch for position detection is provided inside the guide member. Nitrogen hydraulic system (2) characterized in that it is provided with a ferrite magnet that operates the position detection reed switch. In an air-hydraulic system equipped with an actuator/linda operated by hydraulic pressure, a guide member and a ring-shaped free float that slides along the guide member are provided inside the air pressure controller. , the air-hydraulic converter is characterized in that a reed switch for position detection is arranged on the cheap outer side of the air-hydro converter, and a ring-shaped ferrite magnet for actuating the reed switch for position detection is provided on the free float. Device. (3) In claim 1 or 2, a decelerating and stopping member for the operating cylinder is provided between the air-hydro converter and the operating cylinder, which makes it possible to throttle and stop the supply of hydraulic pressure. An air-hydraulic device characterized by