JPH0236999Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a shut-off valve employed in a hydraulic circuit, and in particular, the invention relates to a shut-off valve employed in a hydraulic circuit, and in particular, the invention relates to a shut-off valve that is used in a hydraulic circuit. The spool is slidably assembled to the main body, and the spool is pushed in the axial direction by a pushing member exposed outside the main body to open and close the communicating oil passage between the inlet and the outlet at the intermediate portion of the spool. This invention relates to a shut-off valve designed to

[Prior art]

In this type of shut-off valve, hydraulic oil can pass between the inner hole of the main body and the outer periphery of the spool. Therefore, it is necessary to seal between the main body and the spool to prevent hydraulic oil from leaking to the outside.

However, in the conventional shut-off valve,
An O-ring is interposed between the inner hole of the main body and the outer periphery of the spool, that is, the sliding part, to prevent hydraulic oil from leaking to the outside.

[Problem that the invention attempts to solve]

By the way, in the above-mentioned conventional shut-off valve, if the sealing function by the O-ring is ensured, the sliding resistance due to the O-ring becomes large and a large force is required to move the spool in the axial direction. Problems such as oxidation and deterioration of operational response occur.

[Means for solving problems]

The present invention was devised to address this problem, and in the above-mentioned type of shut-off valve,
It is characterized in that flexible diaphragms are provided between both ends of the spool and the main body to form a pair of oil chambers, and these oil chambers are communicated with each other and with the outlet or discharge port. .

[Functions and effects of the idea]

In the shut-off valve configured as described above, even if hydraulic oil passes between the inner hole of the main body and the outer circumference of the spool, the hydraulic oil enters each oil chamber and is prevented from leaking to the outside by each diaphragm. Flows from each oil chamber to an outlet or outlet. Therefore, the pressure can be balanced so that the spool does not slide in the axial direction, and leakage of hydraulic oil to the outside can be reliably prevented. In addition, in the shut-off valve configured as described above, since there is nothing intervening between the sliding parts of the spool and the main body that inhibits the sliding, the slight force required to bend both diaphragms and the sliding of the spool are The spool can be moved in the axial direction with a small force added to the small force required to move the spool.

〔Example〕

An embodiment of the present invention will be described below based on the drawings.

FIG. 1 shows a part of an engine assembly line, in which an engine 10 is transported by a conveyor 11 to the right in the figure. Further, an I-shaped beam 12 extending parallel to the conveyor 11 is arranged above the conveyor 11, and a moving table 13 is mounted on the beam 12.
2, and a pair of hydro converters (air-hydraulic pressure transmitters) 20A and 20B, which will be described later, are mounted on the moving table 13. Also, the I-type beam 12 has a limit switch 3.
1 is assembled in such a position that it is turned ON at the original position shown in FIG. It's getting old.

The movable table 13 is reciprocated (advances to the right in the figure) or backwards (retreats to the left in the figure) by a drive cylinder 14 formed by fixing the tip of a piston rod 14a to the beam 12. A multi-shaft nut runner 16 having a plurality of sockets 15 is suspended on the lower side, and a drive cylinder 1 is installed on the upper side.
No. 4 cylinder body 14b is fixed. The nut runner 16 itself is well known, and can be moved up and down by a lifting cylinder 17, and can be activated by an operator to tighten the tightened portion of the engine 10 using the socket 15. .

In addition, a shutoff valve 4 is provided on the lower side of the moving table 13.
0, a lever mechanism 50, a proximity switch 60, etc. are assembled, and these are integrally assembled to a base 70 as shown in FIGS. 2 and 3. The configurations of the shutoff valve 40, lever mechanism 50, and proximity switch 60 will be explained below with reference to FIGS. 2 and 3.

The operation of the shut-off valve 40 is controlled by a lever mechanism 50, and can be indicated with a symbol as shown in FIG.
a, an outlet 41b, and an inner hole 41c communicating with these.
The main body 41 has a main body 41, and a spool 42 that is assembled into an inner hole 41c of the main body 41 so as to be slidable in the axial direction. Also, at both ends of the main body 41 in FIG. 2, a pair of holders 43A, 43B and a pair of covers 44A, 44
A check valve 45 is installed at the left end in FIG. 3 for blocking the flow from the inlet 41a to the outlet 41b and allowing flow from the outlet 41b to the inlet 41a. Spool 42
As shown in FIG. 2, the main body 41 forms a constricted part C, and retainers 46A and 46B are screwed to both ends of the constricted part C. The spool 42 is biased to the right in FIG. 2 by a spring 47 with a small resiliency interposed between the retainer 46A and the cover 44A, and is attached to the cover 44B so as to be slidable in the axial direction. Stepped plunger (pushing member) 4 that comes into contact with the cover 44B at the large diameter part
8, and in the illustrated state, the inlet 41a
The communication oil passage of the outlet 41b is closed.

Further, in this shut-off valve 40, flexible diaphragms 49A and 49B are provided between both end faces of the spool 42 and both end faces of the main body 41, respectively. Each diaphragm 49A, 49B
connects its inner peripheral edge to the spool 42 and each retainer 4.
6A, 46B, and the outer peripheral edge thereof is liquid-tightly sandwiched between the main body 41 and each holder 43A, 43B, and the intermediate part from the outer peripheral edge to the inner peripheral edge is the main body. 41 and each holder 43A, 43
After aligning the mating surface of B along the inner peripheral surface of the inner hole of each holder 43A, 43B, each retainer 46A, 46B,
Main body 41 and each retainer 46A, 4 along the outer peripheral surface
The main body 41 and the spool 42 form a pair of annular oil chambers R1 and R2. Each annular oil chamber R
1 and R2 communicate with each other through a communication hole 41d provided in the main body 41, and the communication hole 41d connects to the outlet 4.
It communicates with 1b.

The lever mechanism 50 includes a shaft 51 rotatably assembled to a base 70, a lever 52 fixed to the shaft 51, a crank 53 assembled to the shaft 51 via a day tent mechanism, and the shaft 5.
1 and the crank 53 in the position shown in FIG.
The stopper pin 54 engages with the crank 53 in the position shown in FIG. 2 to restrict rotation of the shaft 51 in the clockwise direction in FIG.
It is biased clockwise in FIG. 2 by a spring 55 stretched between the base 70 and the base 70. As shown in FIG. 3, the daytent mechanism has a shaft 51.
It is composed of a recess 51a provided on the side, a ball 56 and a spring 57 assembled on the crank 53 side, and the shaft 51 and crank 53 are rotated together by the force of the ball 56 engaging with the recess 51a. I'm starting to do that. Note that the above-mentioned engagement force can be adjusted by a bolt 59 fixed by a nut 58. The crank 53 is
A notch 53 extending vertically in the swinging end 53a
A pin 48a fixed to the right end of the plunger 48 in the shut-off valve 40 in FIG. 2 is slidably fitted into the notch 53b.

The proximity switch 60 is attached to the base 70 via a bracket 71, is located opposite the swinging end 53a of the crank 53, and is connected to the movable base 1.
3 (including the original position shown in FIG. 1), when the swing end 53a moves away from the close state shown in FIG. It functions to energize.

Figure 4 shows the engine 10 on the assembly line in Figure 1.
The figure shows a hydraulic/pneumatic circuit in a synchronizing device for moving the nut runner 16 in synchronization with the nut runner 16. In this circuit, the rod side oil chamber 14c of the drive cylinder 14 is connected to the inlet 41a of the above-mentioned shut-off valve 40. The head side oil chamber 14d is connected to the oil chamber of the hydroconverter 20A, and the outlet 41b of the shutoff valve 40 is connected to the oil chamber of the hydroconverter 20B. Further, an air source 91, a muffler 92, and each air chamber of both hydroconverters 20A and 20B are connected to the electromagnetic switching valve 80, respectively. In addition, in the figure, numerals 93 and 94 indicate air filters, numeral 94 indicates a pressure reducing valve, and numeral 95 indicates a pressure gauge.

The electromagnetic switching valve 80 includes a pair of solenoids 81 and 8.
2 and a pair of springs 83, 84,
Both hydro converters 20A, 2 in neutral position
Each air chamber of 0B is connected to a silencer 92, and when one solenoid 81 is energized, it is switched to the forward position and the air source 91 is connected to the hydro converter 20A.
connected to the air chamber of the hydro converter 20B.
When the other solenoid 82 is energized, it switches to the retracted position, connects the air source 91 to the air chamber of the hydro converter 20B, and connects the air chamber of the hydro converter 20A to the silencer 92. Connect to.

In this embodiment configured as described above, as shown in FIG. 1, when the engine 10 is transferred to the right in the figure by the conveyor 11 and moved to a predetermined position,
The upper end of the engine 10 in the forward direction is the lever 5.
Contact the lower end of 2. For this reason, engine 10
As the lever 52 moves forward, the lever 52, shaft 51, and crank 53 rotate together in the direction of arrow A in FIG. Due to this rotation, the proximity switch 60 is first actuated to energize one solenoid 81 of the electromagnetic switching valve 80, and the electromagnetic switching valve 80 is switched from the neutral position to the forward position, and the air source 9 is turned on.
1 is connected to the air chamber of the hydro converter 20A, and the air chamber of the hydro converter 20B is connected to the muffler 92, so that the oil chamber of the hydro converter 20A is connected to the head side oil chamber 14d of the drive cylinder 14.
The hydraulic circuit that leads to becomes pressurized.

After that, when the lever 52, shaft 51, and crank 53 move further in the direction of arrow A, the pin 48a
The spool 42 is then pushed to the left in FIG. 2 via the plunger 48, opening the constriction portion C and allowing flow from the inlet 41a to the outlet 41b.
In this state, hydraulic oil flows into the head side oil chamber 14d of the drive cylinder 14, and hydraulic oil in the rod side oil chamber 14c flows out, causing the cylinder body 14b of the drive cylinder 14, the movable base 13 integrated therewith, nut runner 16, shutoff valve 40,
The lever mechanism 50, the proximity switch 60, the hydro converters 20A, 20B, etc. (hereinafter referred to as the cylinder body 14b, etc.) move forward in the same direction as the moving direction of the engine 10.

Thus, the forward speed of the cylinder body 14b, etc. exceeds the forward speed of the engine 10, and the cylinder body 1
4b etc. move forward relative to the engine 10, the lever 52 rotates in the direction of arrow B in FIG.
In the shutoff valve 40, the throttle portion C is sequentially throttled in accordance with the above-mentioned relative advance amount, so that the amount of hydraulic oil flowing out from the rod-side oil chamber 14c of the drive cylinder 14 is reduced. For this reason, the cylinder body 14
The forward speed of b, etc. is made close to the forward speed of the engine 10. Here, when the forward speed of the cylinder body 14b etc. and the forward speed of the engine 10 become the same, the cylinder body 14b etc. move integrally with the engine 10. Furthermore, if the forward speed of the cylinder body 14b etc. still exceeds the forward speed of the engine 10,
The above-mentioned operation (operation in which the throttle portion C is throttled) is continuously obtained, and the forward speed of the cylinder body 14b etc. and the forward speed of the engine 10 are made the same, and conversely, the forward speed of the engine 10 becomes the forward speed of the cylinder body 14b etc. If it exceeds this, an operation opposite to the above-mentioned operation (operation in which the throttle portion C is opened) is obtained, and the forward speed of the cylinder body 14b etc. and the forward speed of the engine 10 are made the same. Therefore, even if the speed of the assembly line changes and the moving speed of the engine changes, no adjustment of the system is required.

Therefore, the cylinder body 14b etc. and the engine 10 are synchronized, and the nut runner 16 is synchronized with the engine 1.
automatically positioned relative to 0. For this reason,
In such a state, if the nut runner 16 is lowered by the lifting cylinder 17 (this operation can also be performed automatically), each socket 15 will fit into the tightened part of the engine 10, so that the tightening can be performed. Work can be done easily. When the tightening work is completed, the nut runner 16 outputs a completion signal, etc., and the energization to one solenoid 81 of the electromagnetic switching valve 80 is cut off, and at the same time, the other solenoid 82 is energized, so that the electromagnetic switching valve 80
is switched from the forward position to the backward position, and air source 91 is connected to the air chamber of hydroconverter 20B, and the air chamber of hydroconverter 20A is connected to muffler 92. In this state, hydraulic oil flows from the oil chamber of the hydroconverter 20B to the rod side oil chamber 14c of the drive cylinder 14 through the check valve 45 of the shutoff valve 40, and the head side oil chamber 14 of the drive cylinder 14 also flows into the rod side oil chamber 14c of the drive cylinder 14.
Hydraulic oil flows from d to the oil chamber of the hydroconverter 20A, and the cylinder body 14b of the drive cylinder 14
etc. move backward toward the original position shown in FIG.

Therefore, at the beginning of this backward movement, the lever 52
is largely rotated in the direction of arrow A by the engine 10, but after the retainer 46A contacts the cover 44A, the engagement between the ball 56 and the recess 51a in the day tent mechanism is released, and only the lever 52 and the shaft 51 are engaged. It will rotate freely and no unreasonable force will be applied to each member. Note that when the lever 52 is removed from the engine 10, the lever 52 and the shaft 51 are rotated in the direction of arrow B by the spring 55, and the ball 56 and the recess 51a are engaged at the position where the pin 54 contacts the crank 53. to return to the original state.

Furthermore, when the cylinder body 14b etc. return to their original positions, the moving table 13 operates the limit switch 31, so the other solenoid 8 of the electromagnetic switching valve 80
2 is cut off, the electromagnetic switching valve 80 is switched from the retracted position to the neutral position, returning to the state shown in FIG. 4, and the cylinder body 14b etc. are stopped.

By the way, in this embodiment, flexible diaphragms 49A and 49B are provided between both ends of the spool 42 and the main body 41 in the shutoff valve 40, respectively, to form a pair of annular oil chambers R1 and R2. The oil chambers R1 and R2 are connected to the communication hole 41
communicate with each other through b and the outlet 41
It is connected to b.

Therefore, in the same shutoff valve 40,
Even if the hydraulic oil passes between the inner hole 41c of the main body 41 and the outer periphery of the spool 42, the hydraulic oil flows into each annular oil chamber R.
1. Enter R2 and each diaphragm 49A, 49B
leakage to the outside is prevented and each annular oil chamber R
1, flows from R2 to the outlet 41b. Therefore, it is possible to reliably prevent external leakage of hydraulic oil while maintaining the pressure balance of the spool 42.

In addition, in the same shutoff valve 40, since there is nothing intervening in the sliding portion of the spool 42 and the main body 41 that obstructs the sliding, both diaphragms 49
The spool can be moved in its axial direction with a small force that is the sum of the slight force required to bend A and 49B and the slight force required to slide the spool 42. Therefore, not only can the operational response of the shut-off valve 40 be improved, but also the shut-off valve 40 and the lever mechanism 50 can be made smaller and lighter, and contact wear between the lever 52 and the engine 10 can be reduced. Can be done.

Furthermore, in the same shut-off valve 40, a spring 47 is provided so that the spool 42 follows the delicate movement of the lever mechanism 50, so that the engine 10 and the nut runner 1 described above are
6 synchronous operations can be obtained with high precision.

[Modified example]

In the above embodiment, the present invention was applied to the shutoff valve 40 used as a component of the synchronizer that synchronizes the nut runner 16 with the engine 10 transferred by the conveyor 11. A spool is slidably assembled in an axial direction in an inner hole that is connected to an inlet and an outlet, and the spool is pushed in the axial direction by a pushing member exposed outside the main body. The same can be applied to various shut-off valves that open and close the communicating oil passage between the inlet and the outlet at the intermediate portion, for example, the plunger 4 of the above embodiment.
8 and the retainer 46B are integrated into the spring 47.
It is also possible to eliminate it.

Further, in the above embodiment, the shutoff valve 4
0, the annular oil chambers R1 and R2 formed by the respective diaphragms 49A and 49B are communicated with the outlet 41b, but if the shutoff valve is equipped with an outlet, the annular oil chamber R is connected to the outlet 41b.
The present invention can be implemented by connecting 1 and R2.

[Brief explanation of the drawing]

Fig. 1 is a side view showing part of the engine assembly line, Fig. 2 is a partially cutaway enlarged view of the shut-off valve, lever mechanism, proximity switch, etc. shown in Fig. 1, and Fig. 3 is the 3 part shown in Fig. 2. 4 is a sectional view taken along line -3, and is a hydraulic/pneumatic circuit diagram of a synchronizer attached to the engine assembly line shown in FIG. 1. Explanation of symbols 40... Shut-off valve, 41...
...Main body, 41a...Inflow port, 41b...Outflow port,
41c...Inner hole, 41d...Communication hole, 42...Spool, 48...Plunger, 49A, 49B...
...Diaphragm, R1, R2...Oil chamber.

Claims (1)

[Scope of utility model registration request] The spool is slidably assembled in the axial direction within the inner hole that communicates with the inlet and outlet provided in the main body.
In the shut-off valve, the spool is pushed in the axial direction by a pushing member exposed outside the main body to open and close the communicating oil passage between the inflow port and the outflow port at an intermediate portion of the spool. A shut-off valve characterized in that flexible diaphragms are provided between both ends of the valve and the main body to form a pair of oil chambers, and these oil chambers communicate with each other and with the outlet or discharge port. .