JPH1119562A - Variable stroke discharge device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a variable stroke discharge device of a structure that a valve stroke of the device for a viscous fluid can be set accurately and a constant discharge control function is always maintained without depending upon processing accuracy. SOLUTION: A discharge valve shaft 28 constituting a discharge valve means and a discharge valve pipe shaft 32 constituting an exhaust valve means are mutually screwed into each other and connected together so that both shafts 28, 32 are mutually movable in the axial direction. Further, an air piston 44 constituting a cylinder piston means is installed integrally on the outer peripheral face of the exhaust valve pipe shaft 32, and can be moved only in the axial direction to a cylinder end plate 38 using a rotation stopper 50. The distance between the valve means can be regulated by rotating a grip 58 mounted on the end part of the discharge valve shaft 28 so that the valve stroke is variable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a variable stroke type discharge apparatus, and more particularly to a variable stroke type discharge apparatus suitable for discharging and supplying a viscous fluid such as a resin material or an adhesive.

[0002]

2. Description of the Related Art A discharge device used for supplying a fixed amount of resin material or the like is supplied by pressurizing a resin material into a chamber and opening and closing a discharge valve provided in the chamber. In such a discharge device, in order to prevent a viscous fluid such as resin as a supply material from being deteriorated by heat or the like, a second valve that is opened when the discharge valve is closed is provided in the chamber,
An apparatus has been proposed in which a material is prevented from staying in a discharge device by discharging the gas from a chamber to the outside when the discharge valve is closed. For example, Japanese Utility Model Publication No. 2-15587 discloses, as a discharge device, a discharge head having a chamber with a fluid supply port and a discharge port opened and having a discharge nozzle opened, and a discharge valve for opening and closing the discharge nozzle. Means, a second discharge valve means capable of shutting off a flow path between the fluid supply port and the discharge port, and a cylinder piston means attached to the discharge head for driving the valve means to open and close. . By operating the cylinder piston, the discharge valve means having a double shaft structure and the second discharge valve means are simultaneously driven so that the discharge valve is opened and the discharge valve means is simultaneously connected to the fluid supply port and the discharge port. The outlet valve is closed, and conversely, when the discharge valve is closed, the discharge valve means is configured as a so-called flow path switching valve that opens between the fluid supply port and the discharge port.

In this conventional discharge device, the discharge amount can be adjusted by changing the distance between the discharge valve and the discharge valve, and this can be adjusted from the end of the discharge valve on the side of the double-shaft mantle shaft. The end of the discharge valve on the inner shaft side is protruded and a stopper is screwed onto the end, and a screw surface is formed on the outer periphery of the end of the discharge valve on the outer shaft side, and an adjustment nut is screwed on the screw surface. The adjustment nut is rotatably assembled to the discharge valve. Therefore, by rotating the adjusting nut, the discharge valve of the mantle can be moved back and forth along the discharge valve, thereby adjusting the stroke of the discharge valve. To open and close the valve, a screw for fixing the piston is engraved on the outer peripheral surface of the discharge valve on the mantle side, and the piston is screwed and fixed to this screw, actuation of the piston drives the mantle discharge valve and adjusts The discharge valve on the center shaft side is driven via the nut.

[0004]

However, in the above-mentioned conventional discharge apparatus, firstly, there is a problem that the adjustment workability is extremely poor because the adjustment of the valve stroke requires two-handed operation. Secondly, since it is not possible to grasp the stroke adjustment amount in particular, it is difficult to accurately control the discharge amount, and it is not possible to grasp the stroke reference point.
Even with the same ejection device, there is a problem that the ejection control amount differs depending on their processing accuracy, and the same function cannot be provided.

An object of the present invention is to provide a discharge apparatus which focuses on the above-mentioned conventional problems and which can easily perform a valve stroke adjusting operation by one-handed operation. Another object of the present invention is to provide a variable stroke type discharge apparatus having a structure capable of accurately setting a stroke in a discharge apparatus and having a constant discharge control function without depending on processing accuracy. And

[0006]

In order to achieve the above object, a variable stroke type discharge apparatus according to the present invention has a fluid supply port and a discharge port opened in a discharge head having a fluid discharge nozzle opened, Discharge valve means arranged coaxially with a discharge valve outlet stage for opening and closing the discharge nozzle and capable of shutting off a flow path between the fluid supply port and the discharge port, wherein the valve means is attached to the discharge head. In a discharge device having a cylinder piston means for opening and closing, a discharge valve shaft forming the discharge valve means and a discharge valve shaft forming the discharge valve means are screwed and connected to each other to move in an axial direction. A working piston constituting cylinder piston means is screwed onto the outer peripheral surface of the discharge valve shaft, and this working piston can be moved only axially by a rotation stopper on a cylinder end plate. And it is characterized in that the valve stroke variable so as to adjust the spacing of the valve means each other by rotating operation of the grip attached to an end portion of the discharge valve shaft.

[0007]

According to the above construction, the rotation set screw of the discharge valve shaft is loosened, and the operation grip provided at the end of the discharge valve shaft constituting the discharge valve means is rotated with one hand.
The distance between the discharge valve and the discharge valve can be easily adjusted. In a normal state, the cylinder end plate may be prevented from rotating by a rotation set screw or the like, and the rotation set screw is released only during adjustment work so that relative rotation can be performed.
Therefore, the stroke can be adjusted extremely easily, and this adjustment operation can be realized without complicated handling. The stroke adjustment amount can be easily grasped from the number of rotations of the grip from the position where the discharge valve body of the discharge valve pipe shaft abuts on the discharge valve seat.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of a variable stroke type discharge apparatus according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a cross-sectional view of a variable stroke type discharge device according to an embodiment, and FIG. 2 is a partial cross-sectional view in a direction orthogonal to the cross section of FIG. As shown in the figure, the variable stroke type discharge device 10 has a discharge head 12 at the tip end thereof, and a small diameter hole 14S and a large diameter hole 14L are continuously formed concentrically at the center thereof. Chamber 1 formed by
4 are provided. A supply port 16 for introducing a viscous fluid such as a resin to be discharged into the chamber 14 is communicated with the small-diameter hole 14S.
Outlet 1 opened so that fluid can be discharged from inside 4
8 is communicated. The supply port 16 and the discharge port 18 are bored from the side surface of the discharge head 12 and are set to open on the side walls of the small-diameter hole 14S and the large-diameter hole 14L. A small-diameter hole 14 is provided on the tip end surface of the ejection head 12.
A discharge nozzle 20 is opened so as to communicate with the inside along the central axis of S, and a discharge valve seat 22 is attached to this nozzle portion, which can be opened and closed by discharge valve means described later. . The small-diameter hole 14S and the large-diameter hole 1
A discharge valve seat 24 is attached to a step portion between the small-diameter hole 4L and the large-diameter hole 14L so that the flow path between the small-diameter hole 14S and the large-diameter hole 14L can be communicated or shut off. Make up.

In the ejection head 12, a fluid to be ejected is introduced from the supply port 16 and ejected to the outside through the ejection nozzle 20. When the ejection nozzle 20 is opened due to this ejection action, The discharge valve means closes the discharge valve seat 24 between the fluid supply port 16 and the discharge port 18, and conversely, the discharge valve means opens the discharge valve seat 24 when the discharge nozzle 20 is closed. The discharge valve means and the discharge valve means are configured to interlock and switch the flow path.

That is, the discharge valve means includes the discharge valve seat 2.
A discharge valve body 26 that can be moved toward and away from the discharge chamber 2 and a discharge valve shaft 28 that is attached to the tip thereof,
4 are arranged along the center axis. Of course, the discharge valve shaft 28 has a sufficiently smaller diameter than the central opening of the discharge valve seat 24 so that fluid can flow through the outer peripheral portion of the shaft 28. In addition, the discharge valve means is opened and closed with respect to the discharge valve seat 24 so that the flow path can be opened and closed.
It is constituted by a cylindrical discharge valve pipe shaft 32 in which a discharge valve body portion 30 having a tapered surface is formed directly at the tip end. The discharge valve pipe shaft 32 is mounted on the outer peripheral surface of the discharge valve shaft 28 via an O-ring so as to be in close contact with and slidable.

In order to keep the chamber 14 of the discharge head 12 liquid-tight, a seal mechanism 34 is provided behind the large-diameter hole 14L and in contact with the outer peripheral surface of a discharge valve pipe shaft 32 as discharge valve means. As a result, the outer peripheral surface of the discharge valve pipe shaft 32 is sealed in a liquid-tight manner, thereby preventing the discharge fluid in the chamber 14 from leaking to the outside. A seal case 36 is disposed at the rear end of the seal mechanism 34,
In a state where this is passed through the discharge valve pipe shaft 32,
The ejection head 12 is attached to the rear end portion.

In order to drive and operate the above-described discharge valve and discharge valve, in this embodiment, an air cylinder mechanism 40 is formed at the rear of the discharge head 12. The air cylinder mechanism 40 has a front end portion of a cylinder 42 in which the discharge valve shaft 28 is disposed so as to be a center line, is inserted into and fixed to the discharge head 12, and the other end portion is closed by an end plate 38 to thereby be internally provided. A closed space is formed. As described above, the discharge valve pipe shaft 32 is mounted on the outer peripheral surface of the discharge valve shaft 28, and the air piston 44 is integrally formed at the rear end of the discharge valve pipe shaft 32.
The air piston 44 is connected to the cylinder 42
Are slidable along the inner peripheral surface of the. That is,
An air chamber 46 is provided between the rear portion of the air piston 44 and the end plate 38.
The discharge valve pipe shaft 32 is pushed and moved in the valve closing direction by air operation.

Here, the discharge valve pipe shaft 32 is constantly urged in the valve opening direction. Therefore, an air piston 44 formed at the rear end of the discharge valve pipe shaft 32 and a seal case on the discharge head 12 side are provided. A compression coil spring 48 is interposed between them as a spring seat plate, so that the spring biasing force becomes a valve opening operation force of the discharge valve pipe shaft 32.

The air cylinder mechanism 40 is operable against the urging force of the compression coil spring 48 to move the discharge valve pipe shaft 32 in the valve closing direction by the air piston 44. Therefore, the cylinder 42 in which the air piston 44 is inserted is connected to the air chamber 46 by the air piston 4.
4 are arranged on the opposite side of the compression coil spring 48. The cylinder wall is fixed to the end of the discharge head 12 by bolting.

In order to transmit the operation of the air cylinder mechanism 40 to the discharge valve means, a threaded joint is provided on the inner peripheral surface of the discharge valve pipe shaft 32 and a part of the outer peripheral surface of the discharge valve shaft 28. Are operated integrally. At the same time, the distance between the valve bodies 26 and 30 can be adjusted by relatively rotating the two. That is, by supplying working air to the air cylinder mechanism 40, the discharge valve pipe shaft 32 moves leftward in FIG. 1 via the air piston 44, and the discharge valve shaft 28 screwed to this moves leftward. . This operation direction is the direction in which the discharge valve body 26 opens. The drive operation of the air cylinder mechanism 40 moves the distal end discharge valve body 30 of the discharge valve pipe shaft 32 in the valve closing direction, and the stroke to the valve closing position determines the valve opening amount of the discharge valve body 26. I have. Accordingly, the stroke can be set by the distance between the discharge valve body 26 and the discharge valve body part 30, and this is set with respect to the discharge valve shaft 28 with respect to the discharge valve pipe shaft 32.
Can be adjusted by relatively reciprocating.

The stroke adjusting operation is as follows. First, as shown in FIG. 2, the air piston 44 formed integrally with the discharge valve pipe shaft 32 and the cylinder end plate 38 facing the same are rotated in parallel with the discharge valve shaft 28 as shown in FIG. The stopper pins 50 are inserted and inserted to prevent rotation of both. Thereby, the end plate 3
8, the air piston 44 is not rotated, and only the axial movement is allowed. Accordingly, by relatively rotating the discharge valve shaft 28 at the central portion, the discharge valve pipe shaft 32 is relatively advanced and retracted. The rear end of the discharge valve shaft 28 projects outside through the end plate 38 and the stopper plate 52 joined thereto. The stopper plate 52 is fixed and held by tie bolts 54 for fixing the air cylinder mechanism 40 to the ejection head 12. The stopper bolt 52 is provided with a rotation stop screw 56 for tightening the discharge valve shaft 28 penetrating the center portion thereof.
, The discharge valve shaft 28 can freely rotate. A rotating grip 58 is attached to the protruding end of the discharge valve shaft 28 so that an operator can easily operate the discharge valve shaft 2.
8 can be rotated.

In the variable stroke type discharge apparatus configured as described above, resin or the like is supplied from the supply port 16 into the chamber 14. In the non-discharge state, as shown in FIG. 1, the discharge valve pipe shaft 32 is urged rightward in the figure by the action of the compression coil spring 48, and the discharge valve seat 24 is open, so that the chamber The resin and the like supplied to 14 flow from the outlet 18 to the outside. The air valve 44 at the rear end of the discharge valve pipe shaft 32 is biased by a spring to be in a valve-open position. When the air cylinder mechanism 40 is operated from this state, the air piston 44 moves to the left in the drawing to close the discharge valve seat 24 and at the same time is in a screwed state with the discharge valve shaft 28 integrated with the air piston 44. The discharge valve body 26 opens the discharge valve seat 22 via the discharge valve shaft 28. Thereby, the resin and the like are discharged through the discharge nozzle 20. Then, by stopping the supply of the working air, the discharge valve body 30 is opened and the discharge nozzle 20 is closed by the action of the compression coil spring 48. The resin and the like supplied under pressure from the supply port 16 are returned from the chamber 14 to the discharge port 18.

In this embodiment, the discharge valve pipe shaft 32 and the discharge valve shaft 28 integral with the air piston 44 can be relatively moved in the axial direction by screw connection, while the relative rotation of the air cylinder end plate 38 and the air piston 44 is made. The rotation of the grip 58 with the rotation stop of the discharge valve shaft 28 removed makes it possible to easily adjust the valve stroke. This adjustment is performed by the discharge valve pipe shaft 32 including the air piston 44.
Is stopped, the discharge valve shaft 28
It is possible to remove the rotation stop screw 56 and perform only one-hand rotation operation of the grip 58. In addition, the stroke adjustment amount can be easily grasped from the number of rotations from a state where the valve body portion 30 of the discharge valve pipe shaft 32 that moves by the rotation of the discharge valve shaft 28 is in contact with the discharge valve seat 24.

[0020]

As described above, according to the present invention, a fluid supply port and a discharge port are opened in a discharge head having a fluid discharge nozzle opened, and a discharge valve outlet stage for opening and closing the discharge nozzle is coaxial. Discharge valve means disposed in the discharge head and capable of shutting off a flow path between the fluid supply port and the discharge port, and cylinder piston means attached to the discharge head for driving the valve means to open and close. In the device, a discharge valve shaft constituting the discharge valve means and a discharge valve shaft constituting the discharge valve means are screwed and connected to each other so as to be axially movable, and a cylinder is provided on an outer peripheral surface of the discharge valve shaft. A working piston constituting a piston means is screwed on, and this working piston can be moved only in the axial direction by a rotation stopper on a cylinder end plate, and a grip attached to an end of the discharge valve shaft is provided. Having a valve stroke variable so as to adjust the rolling distance of the valve means each other by operation, it is possible to easily carry out with one hand adjustment of the valve stroke of the ejection device, without depending on the processing precision,
The effect that a variable stroke type discharge device having a structure that can always have a constant discharge control function can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a discharge device according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view in a direction orthogonal to the cross section of FIG.

DESCRIPTION OF SYMBOLS 10 Variable stroke type discharge device 12 Discharge head 14 Chamber 14S Small diameter hole 14L Large diameter hole 16 Supply port 18 Discharge port 20 Discharge nozzle 22 Discharge valve seat 24 Discharge valve seat 26 Discharge valve body 28 Discharge valve shaft 30 Discharge Valve body 32 Discharge valve pipe shaft 34 Seal mechanism 36 Seal case 38 End plate 40 Air cylinder mechanism 42 Cylinder 44 Air piston 46 Air chamber 48 Compression coil spring 50 Rotation stopper pin 52 Stopper plate 54 Tie bolt 56 Rotation stop screw 58 Rotation grip

Claims (1)

[Claims] 1. A fluid supply port and a discharge port are opened in a discharge head having a fluid discharge nozzle opened, and the fluid supply port and the discharge port are disposed coaxially with a discharge valve output stage that opens and closes the discharge nozzle. A discharge valve means capable of shutting off a flow path between the discharge head and a cylinder piston means attached to the discharge head for driving the valve means to open and close the discharge means. The discharge valve shaft and the discharge valve shaft constituting the discharge valve means are screwed and connected to each other so as to be axially movable with each other, and an operating piston constituting the cylinder piston means is screwed on the outer peripheral surface of the discharge valve shaft. This operating piston can be moved only axially by a rotary stopper on the cylinder end plate, and the distance between the valve means can be adjusted by rotating the grip attached to the end of the discharge valve shaft. A variable stroke type discharge device characterized in that the valve stroke is made variable so that it can be adjusted.