JP2604242Y2 - Switching valve - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching valve which switches the introduction and discharge of a pressurized fluid to and from a pilot chamber by an electromagnetic switching valve, slides a spool, and switches the direction of fluid flow by a main switching valve.

[0002]

2. Description of the Related Art Conventionally, as a switching valve of this type, FIG.
The following are known. A pilot-operated main switching valve 100 and two solenoid-operated switching valves 102 and 104 are provided. The solenoid-operated switching valves 102 and 104 introduce pressure fluid into pilot chambers of the main switching valve 100 via pilot passages 106 and 108. After discharging, the spool of the main switching valve 100 slides to switch the communication between the output passage 110, the supply passage 112, and the return passage 114.

[0006] As shown in FIG. 6 (only one is shown), the solenoid-operated switching valves 102 and 104 attract a plunger 120 to a fixed iron core 118 by exciting a solenoid 116 and slide a pilot valve body 121. Thus, the pilot passages 106 and 108 are switched.

On the other hand, the solenoid-operated switching valves 102 and 104 are provided with a plunger 12 so that they can be switched manually.
A manual pin 122 is slidably fitted coaxially with the zero. The manual pin 122 is urged by a return spring 124 in a direction away from the plunger 120 via a retaining ring 126 fitted to the manual pin 122.

[0005] The manual pin 122 is pushed against the urging force of the return spring 124 to move the pilot valve body 121 together with the plunger 120 to switch the pilot passages 106 and 108 to introduce and discharge the pressurized fluid into and out of the pilot chamber. By sliding the spool, the flow direction of the fluid is switched.

[0006]

However, in such a conventional device, the longitudinal direction of the entire switching valve becomes longer due to the manual pin 122 provided on the electromagnetic switching valves 102 and 104. Also, the electromagnetic switching valves 102 and 104 are manually operated.
Can be confirmed, but it cannot be confirmed whether or not the main switching valve 100 has been switched.

For example, if there is a malfunction due to locking of the main switching valve 100 or intrusion of dust, etc., the electromagnetic switching valve 10
2, 104 can be manually switched, but the main switching valve 100 is not switched. Therefore, the switching operation of the electromagnetic switching valves 102, 104 does not necessarily confirm the operation of the actuator. Can not.

When the main switching valve 100 is a two-position valve,
When this is used in a machine tool or the like, it is generally impossible to energize the solenoid 116 at the stage of operation preparation.
It is difficult to determine which state 00 has been switched to, and it is difficult to adjust the clamp state of the work. Also,
If you mistakenly move to the next operation as if you are clamping,
Since the work and the cutting tool may be damaged, it is necessary to reliably and easily confirm the switching of the main switching valve 100 during the operation preparation stage.

Therefore, the present invention aims to solve the above-mentioned problems, and has a short longitudinal length, so that the switching confirmation can be reliably performed.
An object of the present invention is to provide a switching valve that can be easily operated.

[0010]

In order to solve the problem, the present invention solves the problem by introducing and discharging a pressurized fluid to and from a pilot chamber which exerts an opposing force on a spool slidably fitted into a valve body. A pilot-operated main switching valve that slides to switch communication between an output passage, a supply passage, and a return passage; and an electromagnetic switching valve that introduces and discharges a pressurized fluid to and from a pilot chamber through a pilot passage that communicates with the pilot chamber. A manual pin which is slidably fitted in the same direction as the sliding direction of the spool , and which can slide and abut on the spool, and slide the spool by sliding the spool.
A switching pin that contacts the manual pin to switch the communication .

[0011]

According to the switching valve of the present invention having the above construction, the electromagnetic switching valve introduces / discharges the pressure fluid to / from the pilot chamber via the pilot passage, and the main switching valve operates by introducing / discharging the pressure fluid to / from the pilot chamber. Hits the spool with the manual pin
It is slid to the output path, switching the communication between the supply passage, the return passage. Further, when the manual pin is slid, the manual pin comes into contact with the spool and is pushed to switch the communication between the output passage, the supply passage, and the return passage.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a switching valve according to an embodiment of the present invention. Reference numeral 1 denotes a main switching valve having a two-position detent, and annular chambers 3, 4, provided at intervals in a valve body 2.
Sliding holes 8 communicating with 5, 6, 7 and large-diameter holes 9, 10 at both ends.
Is provided. A spool 12 is slidably fitted in the sliding hole 8, and the spool 12 has large-diameter portions 13, 14, 15, 16 at intervals.

Left and right plugs 20 and 21 screwed into both side surfaces of the valve body 2 while being prevented from leaking by O-rings 18 and 19
Are small-diameter holes 22, 23 formed coaxially with the sliding hole 8,
Large diameter holes 24 and 25 are provided. Manual pins 26 and 27 are inserted into the small holes 22 and 23, respectively.
The manual pins 26 and 27 in the large-diameter holes 24 and 25 have heads 26 at the ends thereof.
a, 27a are formed to prevent falling off. The left and right pilot chambers 30 are partitioned by the large diameter holes 9 and 10, the spool 12, the large diameter holes 24 and 25, and the manual pins 26 and 27.
31 are formed.

The ends 32, 33 of the spool 12, in which the grooves 34, 35 are formed, are slidably fitted in the large-diameter holes 24, 25, and the grooves 34, 35 are partially cut. The missing elastic rings 36 and 37 are fitted. As shown in FIG. 2, the large-diameter holes 24 and 25 have ends 32 and 33 at the head 2.
An annular recess 38 (only one is shown) having a V-shaped cross section is formed to engage with the elastic rings 36 and 37 when the elastic rings 36 and 37 come into contact with 6a and 27a.

The spool 12, the left and right plugs 20, 21 and the manual pins 26, 27 are coaxially arranged to facilitate assembly, and the grooves 34, 35 and the elastic ring 3 are provided.
Detent mechanisms 40 and 41 are constituted by the recesses 6 and 37 and the recess 38. A block 4 in which output ports 42 and 43, a supply port 44, and a return port 46 are formed in the valve body 2.
8 is attached, and the output port 42 is connected to the output passage 5.
0, the output port 43 is connected to the annular chamber 4 by the output passage 52, and the supply port 44 is connected to the supply passage 45 (FIG. 4).
The return chamber 46 and the return port 46
7 (see FIG. 4) communicates with the annular chambers 3 and 7, respectively. The output ports 42 and 43 are connected to the actuator 53
The supply port 44 is connected to a hydraulic pump, and the return port 46 is connected to a hydraulic tank.

The block 48 has two bottomed holes 54, 5
5 are provided, and are communicated with the left and right pilot chambers 30 and 31 by pilot passages 56 and 57. Also,
The bottomed holes 54 and 55 and the return port 46 are connected by a pilot passage 58. Also, in block 48,
Pilot ports 60 and 61 connected to the hydraulic pump are formed, and the pilot ports 62 and 63 communicate with the bottomed holes 54 and 55, respectively. Double bottomed hole 5
Sleeves 64 and 65 are inserted in the sleeves 4 and 56, and valve bodies 66 and 67 are slidably fitted in the sleeves 64 and 65, respectively.

Fixed iron cores 68, 69 are fitted in the block 48. When the solenoids 70, 71 are excited, the plungers 72, 73 are attracted to the valve bodies 66, 67.
Can be slid against the urging forces of the springs 74 and 75. With these, the electromagnetic switching valve 7
6 and 77, the solenoids 70 and 71 are energized so that the plungers 72 and 73 cause the valve bodies 66 and 6 to operate.
7 to make the left and right pilot chambers 30, 31 communicate with the pilot ports 60, 61.
The valve bodies 66 and 67 are slid by the urging forces of the springs 74 and 75 to communicate the left and right pilot chambers 30 and 31 with the return port 46.

Next, the operation of the switching valve of this embodiment will be described. When the solenoid 70 of one electromagnetic switching valve 76 is excited, the valve body 66 is slid by the plunger 72 and switched to the position 76b in FIG.
2 and the left pilot chamber 30 and the pilot port 60
Is communicated. The other electromagnetic switching valve 77 is not energized, is set to the position 77 a in FIG. 4, and the right pilot chamber 31 and the return port 46 are communicated via the pilot passages 57 and 58.

The pressurized fluid is introduced into the left pilot chamber 30 and discharged from the right pilot chamber 31, the spool 12 is slid to the right in the figure, and the annular chamber 5 and the annular chamber 6 are communicated with each other. 1a. The pressure fluid from the supply port 44 is supplied to the actuator 53 from the output port 42 via the supply passage 45, the annular chamber 5, the sliding hole 8, the annular chamber 6, and the output passage 50. The output port 43 includes an output passage 52, an annular chamber 4, a sliding hole 8, an annular chamber 3, and a return passage 4.
The fluid from the actuator 53 is returned to the hydraulic tank through communication with the return port 46 via.

When the solenoid 71 of the other electromagnetic switching valve 77 is excited, the valve body 67 is slid by the plunger 73 and switched to the position 77b in FIG.
The right pilot chamber 31 and the pilot port 61 are communicated via 7, 63. One of the solenoid-operated directional control valves 76 is not energized and is set to the position 76a in FIG.
The left pilot chamber 30 and the return port 46 communicate with each other via 8.

The pressurized fluid is introduced into the right pilot chamber 31 and discharged from the left pilot chamber 30, the spool 12 is slid to the left in the figure, and the annular chamber 5 and the annular chamber 4 are communicated with each other so that the position shown in FIG. 1b. The pressure fluid from the supply port 44 is supplied to the actuator 53 from the output port 43 via the supply passage 45, the annular chamber 5, the sliding hole 8, the annular chamber 4, and the output passage 52. The output port 42 includes an output passage 50, an annular chamber 6, a sliding hole 8, an annular chamber 7, and a return passage 4.
The fluid from the actuator 53 is returned to the hydraulic tank through communication with the return port 46 via.

On the other hand, the electromagnetic switching valves 76 and 77 at the time of trial operation and the like
When it is necessary to switch the main switching valve 1 without using, the manual pins 26 and 27 are pushed by the tip of a driver or the like. When one of the manual pins 26 is pushed, the manual pin 26 comes into contact with the end 32 of the spool 12 and pushes the spool 12.

As a result, when the elastic ring 36 is disengaged from the recess 38 and the spool 12 slides rightward in the figure, and the end 33 abuts on the head 27a, the elastic ring 37 is fitted into the other recess, and the supply passage is provided. 45, an annular chamber 5, a sliding hole 8, an annular chamber 6, and an output port 50, the supply port 44 and the output port 42 communicate with each other, and an output path 52, an annular chamber 4, a sliding hole 8, an annular chamber 3, The output port 43 and the return port 46 are communicated via the return passage 47.

When the other hand pin 27 is pushed,
The manual pin 27 contacts the end 33 of the spool 12 and pushes the spool 12. As a result, the elastic ring 37 comes off from the depression, and the spool 12 slides to the left in the drawing, and the end 3
When 2 abuts against head 26a, elastic ring 36 fits into recess 38, and supply port 44 and output port 43 are connected via supply passage 45, annular chamber 5, sliding hole 8, annular chamber 4, and output passage 52. The output port 42 through the output passage 50, the annular chamber 6, the sliding hole 8, the annular chamber 7, and the return passage 47.
And the return port 46 are communicated.

As described above, since the manual pins 26 and 27 are provided on the main switching valve 1, the length in the longitudinal direction can be shortened. Further, since the spool 12 is directly slid by the manual pins 26 and 27, the switching of the main switching valve 1 can be surely confirmed. For example, even if an operation failure of the spool 12 due to locking or intrusion dust occurs, it can be directly and reliably confirmed.

At the stage of preparation for operation, when the work such as adjustment of the clamped state of the work is performed, the manual pins 26 and 27 are used.
By switching the main switching valve 1, it is possible to confirm whether or not it is in the clamped state, and it is possible to easily adjust the main switching valve 1 to be in the clamped state by operating the actuator 53 by switching the main switching valve 1. Performs the following operation, and does not damage the work or the cutting tool.

Next, a second embodiment different from the above-described embodiment will be described. The switching valve of the second embodiment has a different configuration from the main switching valve 1 and the other configurations are the same. The same members as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

The main switching valve 90 is of a three-position type. As shown in FIG.
0, 81 are accommodated, and the spool 84 is urged through the spring seats 82, 83 to hold the spool 84 at the neutral position. When the solenoid 70 of one electromagnetic switching valve 76 is excited, a pressure fluid is introduced into the left pilot chamber 30 and discharged from the right pilot chamber 31. The spool 84 is slid to the right in the drawing, so that the supply port 44 and the output port 42 communicate with each other, and the return port 46 and the output port 43 communicate with each other.

When the solenoid 71 of the other electromagnetic switching valve 77 is excited, a pressure fluid is introduced into the right pilot chamber 31 and discharged from the left pilot chamber 30. Spool 8
4 is slid to the left in the figure, so that the supply port 44 and the output port 43 communicate with each other, and the return port 46 and the output port 42 communicate with each other.

When one of the manual pins 26 is pushed,
The manual pin 26 abuts on the end 85 of the spool 84 and pushes the spool 84 rightward in the figure, so that the supply port 44 and the output port 42 are connected, and the return port 46 and the output port 43
Is communicated. When the other manual pin 27 is pushed, the manual pin 27 abuts on the end 86 of the spool 84 and pushes the spool 84 to the left in the figure, so that the supply port 44 and the output port 43 communicate with each other, and the return port 46 And the output port 42 are communicated.

According to the second embodiment, similarly to the above-described embodiment, the length in the longitudinal direction is shortened, and the switching of the spool 84 can be confirmed reliably and easily. As described above, the present invention is not limited to such an embodiment, and can be implemented in various modes without departing from the gist of the present invention.

[0032]

[Effect of the Invention] As described in detail above, the switching valve of the present invention is
The length in the longitudinal direction can be shortened, and even if a spool malfunction occurs due to locking, dust, or the like, it can be directly confirmed, and switching of the main switching valve can be reliably confirmed. Further, there is an effect that the main switching valve can be easily switched by the manual pin.

[Brief description of the drawings]

FIG. 1 is a sectional view of a switching valve according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a detent mechanism according to the embodiment.

FIG. 3 is an enlarged front view of the elastic ring of the embodiment.

FIG. 4 is a hydraulic circuit diagram of the switching valve of the present embodiment.

FIG. 5 is a sectional view of a main switching valve according to a second embodiment.

FIG. 6 is a sectional view of a main part of a conventional switching valve.

FIG. 7 is a hydraulic circuit diagram of a conventional switching valve.

[Explanation of symbols]

1, 90 ... main switching valve 2 ... valve body 1
2. Spool 26, 27 Manual pin 40, 41 Detent mechanism 42, 43 Output port 44 Supply port 4
5 supply passage 46 return port 47 return passage 5
0, 52: output passage 53: actuator 56, 57, 58, 62,
63: pilot passage 76, 77: solenoid switching valve

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shigenobu Usaya 1-1-1, Asahi-cho, Kariya-shi, Aichi Prefecture Inside Toyota Koki Co., Ltd. (72) Yasuo Kondo 1-1-1, Asahi-cho, Kariya-shi, Aichi Toyoda Koki (56) References JP-A-4-236802 (JP, A) JP-A-4-90774 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16K 11/07 F16K 31/42

Claims (1)

(57) [Scope of request for utility model registration] 1. A spool is slid by introducing / discharging a pressurized fluid to / from a pilot chamber which acts on a spool slidably fitted into a valve body to cause an opposing force to be applied between an output passage, a supply passage and a return passage. A pilot-operated main switching valve that switches the communication between the pilot chamber and an electromagnetic switching valve that introduces / discharges the pressurized fluid into / from the pilot chamber through a pilot passage that communicates with the pilot chamber, in the same direction as the sliding direction of the spool. A manual pin that can be slidably inserted and abuts against the spool by sliding is provided , and the spool slides on the manual pin by sliding of the spool.
A switching valve, wherein the communication is switched when hitting .