JPS60263708A - Automatically reciprocating cylinder device - Google Patents

Abstract

PURPOSE:To enable the optional return of an operating piston to an original position, by providing a by-pass between an alternating pressure chamber and a drained oil tank, and making the by-pass optionally openable and closable. CONSTITUTION:A by-pass 9 is provided between an alternating pressure chamber 1a and a drained oil tank so that the by-pass can be optionally opened and closed by a bolt 35. When the alternating pressure chamber 1a and the drained oil tank are connected to each other by turning a handle 34 to move the bolt 35 back to open the by-pass 9, a spool 1 is moved leftward by the remaining pressure of pressure oil in an oil feed passage 22, and the pressure in the oil feed passage drops. The drop in the pressure in the passage 22 is detected by a pressure switch to restart a hydraulic pump to resume the feed of pressure oil. The pressure oil enters into a constant pressure chamber 1b and a chamber 2a on a rod. Pressure oil in a chamber 2b on a head is sent out to the drained oil chamber. As a result, an operating piston is moved and stopped in an original position.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic reciprocating cylinder device for bolt and nut tighteners. ：□ Conventionally, Japanese Patent Publication No. 58-24645 has been cited as prior/similar technology to this persimmon automatic reciprocating cylinder device, and as shown in FIG. and an actuating piston 64 which receives constant pressure and alternating pressure from both sides within the cylinder.
The actuating piston 641 is automatically reciprocated by interaction with the □.

However, in this case, the spool (54) is located as shown in Fig. 5, and the pressure oil is supplied to the oil supply hole 651. On the other hand, pressure oil is introduced into the constant pressure chamber (54b) through the supply oil passage flio), oil filler port 1), and into the alternating pressure chamber (54a). When the actuating piston 154) moves to the left due to the difference in pressure receiving area between the constant pressure chamber (54b) and the constant pressure chamber (54b), the sealing pressure oil in the alternating pressure chamber (52a) of the spunoshi G is transferred from the oil mouth to the actuating piston 64). The oil easily leaks to the drain port (63) through the sliding gap, and the pressure inside the alternating pressure chamber (52a) decreases, causing the constant pressure chamber (
52b), due to the high pressure, the spool G moves erroneously to the left, which causes problems in the reliability of the operation of the working piston (goods), and in this case, the stopping position of the working piston when the pressure oil supply is stopped is It will be irregular.

In addition, there is residual pressure, so in order to improve torque accuracy when tightening, such as with the above-mentioned bolt tightening machine, it is necessary to always be at the thick point position at the start of work, and to eliminate residual pressure so that bolts can be easily tightened at the end of each work. It is unsuitable for applications that require the ability to be removed from etc.

The purpose of the present invention is to prevent malfunction of the working piston due to the occurrence of these leaks, and to improve the conventional automatic reciprocating cylinder device so that the working piston can return to the home position at will. be.

Hereinafter, the present invention will be explained with reference to the accompanying drawings of FIGS. 1 to 4.

This device automatically reciprocates an operating piston (3) in a cylinder (2) by a spunil (1) that receives constant pressure and alternating pressure from both sides and moves with a differential pressure. ) Pilot hole (4a) that communicates the alternating pressure chamber (1a) with the hydraulic pressure source l Two-push pilot valve (5)
A pull pilot valve (7) is interposed in the open passage (6) that communicates the alternating pressure chamber (1a) and the drain oil tank, and the push pilot is operated by the moving operation of the operating piston (3). An interlocking mechanism (8) that alternately operates the valve (51) and the pull pilot valve (7) is provided, and the alternating pressure chamber (1a
This is an automatic reciprocating cylinder device characterized in that a bypass passage (9) is formed to communicate between the oil tank and the exhaust oil tank, and the bypass passage (9) is configured to be freely openable and closable.

Further, preferred embodiments of the present invention will be described in detail with reference to FIGS. 1 to 4.

In the figure, (1) is a spool slidably installed inside the cylinder (2), and (10a) and (10b) are supply/discharge chambers consisting of annular grooves formed on both sides of the spool (1).

0]) is a small diameter operating rod that presses the spool (1).

(1a) and (lb) are an alternating pressure chamber and a constant pressure chamber, respectively, which face the other end of the spool (1) and the end of the small diameter operating rod Uυ, and into which pressure oil is introduced.

The side wall of the cylinder (2) where the spool (1) is located is provided with an oil escape hole, an oil supply hole (L3, a pilot port I, a communication hole α type, and an oil drain hole αe). moves to the right, the oil escape hole Q21, oil supply hole 03, pilot port (14) and communication hole 05) are connected to the supply and discharge chamber (10aX10b).
), the drain hole (16) is closed, and the spool (
1) moves to the left, the oil supply hole (14), the pilot port (14+, the communication hole (1ω) and the oil drain hole (16) are connected to the oil supply and discharge chamber (14).
10aX10b).

The cylinder hole (1, 71!2) in the cylinder (2) allows the actuating piston (3) to slide freely (-), and the actuating piston (3)
) A rod side chamber (2a) and a head side chamber (2b) are formed between the spool portion and the cylinder hole (17).

(1 barrel is an oil supply path that communicates the oil supply hole σ4 and the rod side chamber (2a), and H is a communication path that communicates the communication hole α4 and the head side chamber (2b).

The handle is the fuel supply pipe connection port, C! υ is an oil drain pipe connection port, in which a supply oil passage (22) and a discharge oil passage (c) communicate with the pilot port I and the oil drain hole a, respectively, and a supply oil passage (22) and a constant pressure chamber (
1b) through the pilot hole (4b), and the discharge oil path (
C) and the oil escape hole (I2) are connected through an oil escape hole (I2).

Push pyro, g valve (5) has valve hole (5a) s valve body (5b
), valve biy (5cL valve head (5d), valve seat (52),
It consists of a valve hole (5f), a valve hole (5g), and a valve spring (5h), and the inside of the valve hole (5a) and the pilot port←4 communicate through the pilot hole (4a), and the valve spring (5h). and the valve hole (5
a) and the valve passage hole (5f) are closed.

The pilot valve (7) has a valve hole (7!l) and a valve body (7b).
), valve pin (7C), valve ball (7d), valve seat (7e)
+Valve hole (7f).

Consists of valve port (7g) + valve spring (7h), pole seat (71), valve hole (7a), alternating pressure chamber (la), l valve hole (
7a) and the valve port (5g) are the pilot hole (4), respectively.
a), the valve hole (7g) and the discharge oil path (c) are connected through an open path (6), and the valve spring (7b) connects the valve hole (7a) with the valve hole (7a).
) and the valve passage hole (7f) are closed.

The interlocking mechanism (8) consists of a connecting rod (c), a switching lever (c), etc., and a push pilot valve (5) located in the center of the switching lever (c).
) and the left side of the pull pilot valve (7), which can swing freely with a fulcrum pin (c), and the lower part (two retaining pieces (c), the connecting piece (toward) with the long retaining hole C! ), screw the left part of the connecting piece □□□ (two connecting rods I25), and tighten the actuating piston (3
)'s opening of the switching hole 0υ in the head (double nut) C
(See step 2, loosely insert the connecting rod (c) into the center of this pull nut +321, fix the trigger (to) at its left end, and when the actuating piston (3) moves to the right (2), The trigger is pushed to the right by the pushing surface (31a) on the bottom of the switching hole CIIJ, and the valve bottle (5c) is pushed through the connecting rod (2J and connecting piece (G)), and the push pilot valve (5) is pushed. opens, and when the actuating piston (3) moves to the left (two times), the pull nut reaches 0.
The trigger - is pulled in the left direction (twice) on the force surface (32a) of the inner sprout of z, and the switching lever ( The lower part of b)) is towards the left (
- When pulled, the upper part of the switching lever swings to the right, the valve pin (7C) is pushed to the right, and the pull pilot valve (7) is designed to open.

The bypass passage (9) is formed in communication between the valve hole (7a) and the open passage (6), and can be opened and closed at the tip of the opening/closing pole (051) which is moved forward and backward from the handle N+2.

The closing means 811 of the bypass path (9) can be modified in design in place of the embodiment shown in the drawings.

Since this embodiment has the above-mentioned configuration, the oil supply pipe connection port 4 and the oil drain pipe connection port c2υ are respectively connected to a hydraulic power source, a drain oil tank, etc. (not shown), and the operating piston (3) shown in FIG.
Connect the oil supply pipe from the hydraulic source at the location (4).

Pressure oil is supplied to the pilot port C14) via the supply oil path The viroft valve (7) opens and communicates with the discharge oil path (c), resulting in low pressure.

Therefore, Nubour (1) moves to the left.

For this reason, pressure oil is supplied to pilot hole I and oil supply hole a~.

The oil is introduced into the rod side chamber (2a) through the oil supply path.

At this time, the head side chamber (fb) is connected to the communication passage 3. 9. It communicates with a drain oil tank (not shown) through the oil drain hole ae, the drain oil path (c), and the drain oil pipe connection port 0υ, and therefore, the actuating piston (3) starts moving rightward.

During the movement of the operating piston (3) to the right, the switching lever (2Q) separates from the valve pin (7c), the valve spring (7h) pushes the valve pole (7d), and the pull pilot valve +71 closes. Because the pressure inside the pressure chamber (1a) is low, the spool (1)
No movement occurs, and the actuating piston (3) continues to move to the right (2).

After that, the actuating piston (3) continues to move to the right, and the pushing surface (
31a), when the trigger is pushed to the right, the connecting rod (
C) Connect the valve pin (5c) to the right to fully open the pilot valve (5) and open the pilot port I.

Pilot hole (4a), valve hole (5a), excellent hole (5a)
f) Pressure oil is introduced into the valve hole (7a) through the valve port (5g) and the pilot hole (4a), and the pull pilot valve (7) and bypass passage (9) are closed, so the alternating pressure Pressure oil is introduced into the chamber (1a), and the small diameter operating rod (IIJ
Since the pressure receiving area of the alternating pressure m(la) is larger than the pressure receiving area of the spool (1), the spool (1) moves in the right direction (two directions) as shown in FIG.

When the subuno ν(1) moves to the right, the pilot port I and the communication hole communicate with each other, and pressure oil is introduced into the head side chamber (2b) through the communication path (191).

At this time, the inside of the rod side chamber (2a) has the oil supply name Ql19,
Oil supply hole 0. The two oil drain pipes (not shown) are connected through the oil escape path Q, the drain oil path (c), and the drain pipe connection port (2]), and the operating piston (3) starts moving to the left (= starts moving). .

When the push surface (31a) separates from the trigger Q during the movement process of the operating piston (3), the valve pin (5C) is pushed to the left by the valve spring (5h), and as shown in Fig. 2, the push pilot valve (5)
is closed, so the pressure oil in the excellent hole (-5f), valve port (5g), valve hole (7Ji), and alternating pressure chamber (1a) is sealed because the pull pilot valve (7) is closed. Ru.

Therefore, the spool (1) does not move, but stops at the right position, and the actuating piston (31) moves to the left.

After that, the operating piston <3) continues to move, and the pulling nut C3
When Kawamami (32a) of No. 21 pulls the trigger (G), the connecting lid is in the 0th stage.

The switching lever Q6) is swung through the connecting piece (to), etc., the valve bottle (7c) is pushed to the right, the pull-out valve (7) is opened, and the inside of the alternating pressure chamber (1a) is Sealed pressure oil such as valve hole (7a), excellent hole (7f), through hole (7g), etc.
The oil is led out to a drain oil tank (not shown) through an open path (6), etc.
Therefore, the pressure in the alternating pressure chamber (1a) decreases, so the spool (1) moves to the left by the pressure oil in the constant pressure chamber (1b), and the working piston (3) moves to the right as shown in Figure 3. After the movement in the direction 0 starts, the above operation is repeated.

Next, in the case of a bolt tightening machine, etc., the bolt is sieved by the above-mentioned reciprocating motion, reaches the specified torque, and the pressure in the supply hydraulic circuit increases, and when this is detected by a pressure switch (not shown),
The hydraulic pump stops, the supply of pressure oil stops, and as a result of stopping the supply of pressure oil, the 1 working piston (3) moves to the cylinder (2
), the working piston (
3) To return to the home position, use the hand/I/C3
41 to retreat the opening/closing bolt (c), open the bypass passage (9), and open the alternating pressure chamber (1a) as shown in Fig. 4.
It communicates with the drain oil tank (not shown). (Fig. 3) In this way, when the alternating pressure chamber (1a) is communicated with an oil tank (not shown), the pressure inside the alternating pressure chamber (1a) decreases.

The spool (1) moves to the left due to the residual pressure of the pressure oil in the supply oil passage 04, etc., and the internal pressure of the supply oil passage (24) decreases, which is detected by the pressure switch and the hydraulic pump is restarted. Then, the supply of pressure oil was resumed, and the pressure oil was fixed to the constant pressure type (lb) and the rod side chamber (2a).As a result, the working piston (3)
The pressure oil in the head side chamber (2b) is led out to a drain oil tank (not shown), and the operating piston (3) is returned to its original position and stopped.

At this time, even if pressure oil is supplied continuously, the pull pipe Ut valve (7) is open but the bypass passage (9) is in communication with a drain oil tank (not shown), so the spool (1) does not move to the right, and the 1-actuating piston (3) does not move to the left.

When moving the operating piston (3) protruding and retracting, turn the handle (B) to advance the opening/closing bolt (To),
Al because the bypass path (9) is closed.

In addition, by turning the handle (b) to open and close the bypass passage (9) while the hydraulic pump is running, the reciprocating movement of the operating piston (31) and the stopping at the return home position are performed. You can also do that.

As described above, the present invention uses a cylinder (
2) A push pilot valve (5) is installed in the pilot hole (4a) which communicates the alternating pressure chamber (1a) of the spool (1) with the hydraulic pressure source. A pull pilot valve (7) is interposed in the open passage (6) communicating the alternating pressure chamber (1a) and the drain oil tank, and the push pilot is operated by the moving operation of the operating piston (3). An interlocking mechanism (8) that alternately operates the valve (5) and the pull pilot valve (7) is provided, and a bypass path (9) is formed that communicates the alternating pressure chamber (1 m) with the drain oil tank. The bypass path (9) is configured to be openable and closable.1
Therefore, the actuating piston (3) does not move due to the pressure difference on both sides, and leakage at the actuating piston (3) position based on this can be prevented, and the repeating operation of the actuating piston (3) can be performed reliably. Moreover, it is also suitable for applications where it is required to always return to the home position and eliminate residual pressure when starting work.

As mentioned above, it is possible to fully achieve the intended purpose.

[Brief Description of the Drawings] The drawings show one embodiment of the present invention, so Figures 1 to 7 are longitudinal sectional views, and Figure 5 is a diagram of a conventional example. )...Alternating pressure chamber, (2)...Cylinder, (3)...Working piston, (4a)...Pi tff
, 7 holes, (5)...push pilot valve, (6)...open path, (7)...pull pilot valve, (8)...1! I! moving mechanism, (9)...bypass path.

Claims (1)

[Claims] The actuating piston in the cylinder is automatically reciprocated by a spool 32 which receives constant pressure and alternating pressure from both sides and moves with a differential pressure, and a pilot hole communicates the alternating pressure chamber of the spool with a hydraulic source. A push pilot valve is interposed in the pressure chamber and a pull pilot valve is interposed in the open passage communicating the alternating pressure chamber and the drain oil tank, and the push pilot valve and the pull pilot valve are interposed in the open passage communicating the alternating pressure chamber and the drain oil tank. An automatic system characterized by having an interlocking mechanism that operates alternately, further forming a bypass passage that communicates the alternating pressure chamber and the drain oil tank, and configured to freely open and close the bypass passage. Reciprocating cylinder device.