JPS58149486A - flow control valve - Google Patents

Abstract

PURPOSE:To prevent the opening of a valve from varying when a nut member is not driven to rotate, by a method wherein an end part on the valve-opening direction side of a nut member is pressed against a part of a valve housing by an action of a hydraulic pressure to be controlled on the nut member. CONSTITUTION:A valve rod 28 is screwed to a main body 15 of the nut member 14 through a ball spring mechanism 29, and the tip end of the valve rod 28 makes contact with a valve spool 13. The hydraulic pressure to be controlled acts on the nut member 14 through the valve spool 13 and the valve rod 28, so that rotation of the nut member 14 is restricted by the action of the hydraulic pressure. The valve housing 1 is provided with a pressure-balancing device 49 for releasing the pressure exerted on a surface 48 by the nut member 14.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to flow control valves, particularly RlIIIIII for pressurized fluids.
The present invention relates to a flow control valve useful for li.

In general, a flow control valve installed in the hydraulic circuit for the injection cylinder of a die-casting machine is rotatably supported in a valve housing jig via a nut connected to a motor and a bearing of a member. The valve stem, which is screwed into the nut member via a ball screw machine II, can only be moved in the KIli direction within the valve housing, and the valve opening t can be adjusted by moving the cough valve stem in the axial direction. ing.

However, in the conventional flow control valve described above, the nut member is attached to the valve housing through the bearing so that it can be rotated very easily.Furthermore, when the nut member is not rotated, the controlled fluid pressure acts on the valve stem. As a result, the nut member easily rotates, causing a problem in that the valve stem moves in the axial direction and the valve opening changes.

In order to solve the above-mentioned problems, attempts have been made to incorporate a K11m brake device etc. in the connection path between the nut member and the motor, but this has resulted in an increase in the size of the device and the need for inspection lines of the internal structure (such as E etc.). Due to problems, it is not suitable for practical use.

In view of the above problems, the present invention has a small and simple configuration.
The purpose of the present invention is to provide a flow control valve that can prevent the noise of changes in valve opening when the upper member is not rotated, and can also prevent overload of the rotational drive source. The nut member is supported so as to be able to be slightly displaced in the axial direction with respect to the valve housing, and the nut member is pressed to 11% of the valve housing by the action of controlled body pressure on the upper member. In addition, the valve housing is provided with the nut member 1 when the nut member is driven to rotate.
The present invention is characterized in that a pressing force balancing device is provided which releases the pressing force of the nut member against a part of the valve housing by pressing in the valve closing direction against the collar control fluid pressure.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, 1 is a valve housing, the valve housing 1 is fixed to the manifold 2 with bolts 3, and the housing 4 is fixed to the front nozzle housing 4 with bolts 5. #It is roughly composed of a rear housing 6 attached to a middle housing 6 via an end plate 7.

Inside the manifold 2 are fitted sleeves 9 and 7, which fit into the housing 4.
A controlled fluid O inflow boat 10 is formed at the bottom of the sleeve 9, and a FIAT boat 11 for controlling fluid is formed at the side surface of the sleeve 9.
is formed. Inflow boat 100 for sleeve 9 yen
A valve spool 1S for flow rate adjustment, which can be seated, is slidably fitted into a nine-valve seat @12 formed in the inner part of the opening.

A nut member 14 is provided between the front housing 4 and the housing 6 of the housing 1. Na.

As the upper member, a ball screw type member with good power transmission efficiency is used. This nut member 14 is approximately separated from a nut body 15 and a nut holder 1+6.17 that axially clamps the nut body 15, and a driven gear 19 coupled to the nut body 15 via a key 181 and a nut holder 16.゜17 and nut body 15 are bolt 20
It is uniformly fixed by

The driven gear 19 meshes with a drive wheel 21, and the drive gear 21 is connected to the output shaft of a motor (here, a DC motor) 24 via a shaft 22 and a coupling 25f. A tool engagement 522A is formed on the shaft 22, and a cap 2s1kklR? is attached to the middle housing 6. ) and by engaging a spanner or the like with the tool engaging portion 22A of the shaft 22, the shaft 7)2
2t - It can also be turned manually.

As shown in Figure 2, the nut holders 16 and 17 are rotatably supported by the front housing 4 and the dollar housing 6 via bearings 26 and 27. Here, the bearing 26 located at the end of the nut member 14 in the valve closing direction is made of a ball bearing, and the bearing 27 located at the end of the nut member 14 in the valve opening direction is made of a thrust bearing. There is.

A valve rod 28 is screwed into the nut body 15 of the nut member 14 via a ball screw machine WI29t, and the tip of the valve rod 28 (the left end in FIG. 1) is in contact with the valve spool 1s.

The rotation regulating layer material 30 is attached to the valve stem 28 by key connection *b
As shown in FIG. 3, the rotation regulating member 5
When the nine protrusions 31 formed on the middle housing 6 are slidably fitted in the axial direction 32 formed on the middle housing 6, the rotation of the K-shaped valve stem 28 is restricted.

A valve rod pressing ram 34, which can be made uniform, can freely slide on the rear end surface of the valve rod 28 (leftward surface in FIG. 1) in a round hole s5, which is formed in the φ6 portion of the rear housing 8. The valve stem pressing ram 54 is always pressed against the rear end surface of the valve stem 28 by a spring 55. The valve stem pressing ram 34 and the spring 35 serve to prevent the valve stem 28 from swinging or sagging.

As shown in FIG. 84, the rotation regulating member 30 has a rod 56.
．． A cam member 38 and a V gear 39 are connected via S7f, and the rear housing 8 is configured to move the valve rod 28 between the forward (valve closed) position and the reverse limit (valve open maximum) by contacting the cam member 38. ) position and limit switch 40.4
1 is included. Further, as shown in FIG. 5, the rear housing 8 is provided with a position detector (for example, a rotary encoder) 43 equipped with a pinion 42 that meshes with the rack gear 39.
Therefore, it is possible to detect the midway position fI of the valve stem 28 (midway valve opening 1ift).

As shown in FIG.
A sealing member 44 is provided between the machine control fluid and the lubricating oil in the Ujifugu 1 to prevent them from mixing, and a drain hole 45 provided in the skeleton sealing member 44 A trap is formed so that leaked oil from both sides of the seal member 44 can be discharged to the outside.

As shown in detail in FIG. A round disc spring 4 is provided between the front housing 4 and the front housing 4 to bias the nut member 14 in the valve opening direction and prevent rattling between the shell nut member 14 and the valve stem 28.
6 is interposed.

When the nut member 14 is pushed in the valve opening direction, its end face in the valve opening direction, that is, the face 47 of the nut holder 170 here, comes into contact with the opposing face 48 of the valve housing 1. Therefore, if an attempt is made to break the nut member 14t in this suppressed state, a large resistance force will be generated due to the frictional force between the two fJs 47 and 48. Actually, since the machine control fluid pressure acts on the nut member 14 via the valve spool 15 and the valve stem 28r, the rotation of the nut member 14 is regulated by the action of this collar control fluid pressure.

The valve housing 1 is provided with a pressing force equalizing device 49 for releasing the pressing force of the nut member 14 against the surface 48. To explain this pressing force balancing device 49 in detail, as shown in FIG.
50 is slidable in the axial direction, and the valve-opening direction IIfIIA portion of the nut member suppressing knob 50 is fitted into a resting function 1151 formed in the rear housing 8.

The pressurized fluid working chamber 51 is communicated with the pressurized fluid supply port 53 through the passage 52 and the hole 5st1, and the inside of the pressurized fluid working chamber 51 is communicated from the pressurized fluid supply port 5s through the hole s5 and the passage 52. When pressurized fluid is supplied to A5, the nut member is depressed.
0 is pushed out to the left in FIG. 1, and the nut member 14 is pushed in the valve closing direction via the bearing 27 by the nut member pressing ram 50 and separated from [1148]. This situation 1
1, the nut member 14 is the bearing 24, 271
- The nut member 14, which is supported through the valve housing IK, can be easily driven in rotation.

The pressurized fluid supply port 53#i is connected to the pump 55 through the valve 54t, and the valve 54Fi operates and moves with the motor 24 in response to a signal from the control circuit 56, thereby connecting the pump 55 and the pressurized fluid supply port 53. Switched to communicate with t.

fIK with the above configuration, the quantity control valve is used as a flow rate control valve of a high hydraulic drive system in an injection cylinder drive hydraulic circuit for a die casting machine, and the valve spool 13 is normally 140 mm.
The fluid pressure from the K4/AT LK and 210-7 countries' AKI MURATOR is combined. ζO fluid pressure is valve spool 1s
Since it acts on the valve stem 211 from the
If the nut member 14 is simply supported by the valve housing 1 via the bearings 26 and 27, the nut member 14 will rotate due to the pressing force of the valve stem 28 in the valve opening direction, and the valve stem 28 will move as it slides. When the valve is rounded about Km in the valve opening direction, the valve li& changes.

However, in the above case 11aftI according to the present invention, the surface 47 of the nut member 14 is pressed against the surface 48 of the valve housing 1 due to the action of the controlled fluid pressure, so that the nut member 141 resists the force that attempts to rotate it. A force is generated and rotation of the nut member 140 is restricted. Therefore, the valve stem 28 cannot be displaced in the valve opening direction, and therefore,
Valve opening length does not change. It goes without saying that such a rotation regulating action of the seat member 14 can be obtained not only when the valve is in the closed position 1, but also when the valve is in the vertical position.

On the other hand, the nut members 140 and 47 are connected to 11 of the valve housing 1.
] 48, the motor 24)
When attempting to rotate the Q material 14t, an overload is applied to the motor p24, but in the above embodiment according to the present invention, when the motor 24 operates, the valve 54 operates and pressurizes the pressurized fluid action chamber 51. Fluid is introduced and its hydraulic pressure
) The member pressing ram 50 is pushed to the left in FIG. The pressing force on Ifi 48 is released. Therefore, the nut member 14 is
Since it is connected and supported to the valve/X housing 1 via 6.27f and can rotate freely, the motor 2
The rotational driving force of 4 is easily transmitted to the nut member 14 via the shaft 22, the driving wheel 21, and the driven unit 19.

In addition, when turning the nut member 14, since the UK4 acts on the valve stem pressing ram 34 in the same manner as it acts on the nut member suppressing ram 50, roughly the same force acts on the valve #28. There is. As a result, the valve stem 28 is in a state where it can easily move in either direction in the axial direction, and the valve can be opened and closed by turning the shaft 141r with an extremely small force.

By rotating the nut member 14 in the forward or reverse direction in this manner, the valve stem 28 is displaced in the axial direction, and the valve opening is adjusted to a desired degree. And valve 11@
When f reaches the desired magnitude Kxal L&, the motor 24 is stopped, the flow path of the valve 54 is switched, and the hydraulic pressure of the pressurized fluid action 1i51 is released. Therefore, the nut member 14 is again pressed against the valve housing 10 surface 48 by the action of the control mR body pressure.

The above-mentioned embodiments have been described, and the present invention is based on the above-mentioned practical mf1
Needless to say, the embodiment is not limited to the embodiment 1, and for example, the pressing 11 of the nut member 14 and the valve housing 1
147.K to form unevenness that engages with each other at 48
L, OK, OK, pressing force balance device is hydraulic part tllE
11411, etc., which act on the vent member, may also be used.

As explained above, the present invention has a nut member' which is rotatably provided in a valve housing and which is supported so as to be able to be slightly displaced in the axial direction with respect to the valve opening, and which allows controlled f & body pressure to be applied to the nut member. The valve of the armpit nut member is opened by the action of
The end part is pressed against a part of the valve housing, and the valve housing has a part that presses the nut member in the valve closing direction against the controlled fluid pressure when the nut member is driven to rotate. Since it is based on the provision of a pressing force balancing device that releases the pressing force of the nut member on a part of the valve housing, there is no need for a complicated motor brake device, etc. The small and simple structure prevents the valve opening from changing when the nut member is not rotated, and the valve can be opened and closed quickly and quickly with extremely small force.For example, die-casting The one-close valve and tIf for high-speed injection of the machine are extremely useful as a control valve.
Overload of rotary drive source? This means that it is possible to provide a flow control valve that can prevent such problems.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of a flow control valve showing an embodiment of the present invention, Fig. 2 is an enlarged view of the main part of Fig. 1-, and Class 5 is 1 of Fig. IN1.
1st edge Ka5 main part sectional view, Figure 4 is the same as Figure 1! V-P/#
Fig. 5 shows a cross section of the main part along V-V* of the fourth prisoner. 1... Valve housing, 14... Nut member, 2
6.27...Bearing, 28...Valve stem, 49
... Pressing force balance device, 50... Nut member pressing ram, 51-... Pressurized fluid action chamber. Patent Applicant: Ube Industries, Ltd. Patent Agent: Akira Aoki, Patent Attorney, Kazuyuki Nishi, Patent Attorney, Kuni Nishioka, Patent Attorney, Misaki Yamaguchi.

Claims (1)

[Scope of Claims] 1. A nine nut member Kb connected to the lp1 transmuted am is rotatable within the valve housing, and a valve stem screwed into the g member is movable only in the axial direction within the valve housing cIT. Generally, in a flow control valve configured to adjust the valve opening at-X by axial movement of the valve stem, the nut member screwed onto the valve stem can be slightly displaced in the axial direction with respect to the valve housing. The nut HtB material is supported by a part of the valve housing by the action of downward control fluid pressure on the nut member, The flow rate is based on the fact that a pressing force balancing device is provided to release the pressing force of the nut member against a part of the valve housing by pressing the nut member in the valve closing direction against the controlled fluid pressure. control valve.