JP2019150788A - Anti-dripping valve for nozzle - Google Patents

Abstract

To solve the problem that a residual material in a nozzle is left as is.SOLUTION: An inlet hole 6 and an outlet hole 7 are formed in a base body 4 of a valve main body 1, and a material supply hole 8 through which the inlet hole 6 is communicated with the outlet hole 7 and a supply hole 9 through which compressed air is supplied to the outlet hole 7 are formed in a valve bar 5. Automatic valve-closing means 2 and automatic valve-opening means 2a are stored in casings 10 and 10a fixed to both end parts of the base body 4 so that pistons 11 and 11a can be reciprocated by air pressure, and pushers 12 and 12a of the valve bar 5 are integrally formed in the pistons 11 and 11a. Tip parts of the pushers 12 and 12a are penetrated through the casings 10 and 10a and inserted through a through-hole hole 3 of the base body 4. In the piston 11 and the pusher 12 of the automatic valve-closing means 2 is formed a communication hole 13 penetrating through the piston 11 and pusher 12. When the valve bar 5 is slid in a valve-closing direction by the automatic valve-closing means 2, by communicating the communication hole 13 with the compressed air supply hole 9, compressed air supplied into the casing 10 of the automatic valve-closing means 2 can be pressure-fed to the outlet hole 7.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a liquid discharge valve for a nozzle used in a liquid discharge apparatus, particularly an adhesive application apparatus that is a low-pressure foam.

  Conventionally, in a nozzle used in a liquid ejection device, measures against liquid leakage of residual material in the nozzle after the completion of ejection have been taken. For example, a valve seat is used to eject and stop pressurized liquid. A valve body provided so as to be able to come into contact with and away from, and a suction rod slidably inserted in the valve body to prevent liquid leakage, and a nozzle body for discharging liquid, The valve body includes a valve body piston part, and can be separated from the valve seat as the valve body piston part moves. The suction rod includes a suction piston part, and the stroke of the suction piston part. With the movement, a negative pressure state is formed inside the nozzle body, and it is possible to prevent liquid leakage at the tip of the nozzle body, and the stroke adjustment mechanism so that the stroke moving distance of the suction piston part can be adjusted One provided is found (for example, see Patent Document 1).

  By bringing the tip of the valve body into contact with the valve seat and closing the valve, and while discharging the material from the nozzle tip is stopped, the suction piston is pushed up to make the liquid chamber below the suction rod negative pressure. The residual liquid hanging from the tip of the nozzle is sucked into the nozzle body, and it is possible to prevent liquid leakage from the tip of the nozzle.

Japanese Patent No. 3478319

  However, in the case of the above prior art, in the case where it takes a long time to restart after stopping the discharge, especially when the tip of the nozzle is long, the remaining material also becomes large. There is a high possibility of dripping, especially if it is a foamed resin-based material, and the reaction will proceed, so the remaining material may not be usable even after resuming discharge. There were problems that had to be solved, such as various problems caused by leaving the material as it was.

  In view of the problem that the residual material in the nozzle is left as it is, the present invention is provided with automatic valve closing means and automatic valve opening means on both sides of the valve body, and the valve body has through holes. And a valve rod fitted in the through hole so as to be reciprocally slidable. An inlet hole and an outlet hole are formed in a side portion of the substrate, and the inlet hole is opened in the valve rod. And a material supply hole communicating with the outlet hole, and a compressed air feed hole to the outlet hole in a closed state, the outlet of the material supply hole and the outlet of the compressed air feed hole are the valve In parallel with the longitudinal direction of the rod, the distance between the centers of both outlets is the same as the stroke length of the valve rod, and the automatic valve closing means and the automatic valve opening means are fixed in both ends of the base. The piston is accommodated in a reciprocating manner by air pressure, and the piston is A rod pusher is integrally formed, and the pusher has a tip portion that penetrates the casing and is fitted into the through hole to be in contact with both end surfaces of the valve rod. If the valve rod is slid in the valve closing direction by the automatic valve closing means by forming a communication hole penetrating the piston and the pusher and communicating the communication hole with the compressed air supply hole, the automatic valve closing means The compressed air fed into the casing can be pumped to the outlet hole to solve the above problem.

  In short, the present invention is provided with automatic valve closing means and automatic valve opening means on both sides of the valve body, and the valve body includes a base body having a through hole, and a valve rod fitted and slidably inserted into the through hole. An inlet hole and an outlet hole are formed in a side portion of the base body, a material supply hole that communicates the inlet hole and the outlet hole in a valve open state with the valve rod, and the outlet hole in a valve closed state The outlet of the material supply hole and the outlet of the compressed air supply hole are arranged in parallel in the longitudinal direction of the valve stem, and the distance between the centers of both outlets is set to the valve. The automatic valve closing means and the automatic valve opening means accommodate a piston in a casing fixed to both ends of the base body so as to be able to reciprocate by air pressure. A pusher is integrally formed, and the pusher has a tip portion located on the case. A communication hole that penetrates the piston and pusher is formed in the piston and pusher of the automatic valve closing means, and is inserted into the through hole and inserted into the through hole. Is connected to the compressed air supply hole, so that a nozzle communicating with the outlet hole is attached to the base and the valve rod is slid in the valve closing direction by the automatic valve closing means. Since the compressed air can be fed into the outlet hole and the nozzle through the compressed air feeding hole, the residual material in the outlet hole and the nozzle can be eliminated completely and automatically, and the practical effect thereof. It is very big.

It is a longitudinal cross-sectional view which shows the valve opening state of the liquid running out valve for nozzles which concerns on this invention. It is a longitudinal cross-sectional view which shows the valve closing state of the liquid running out valve for nozzles which concerns on this invention.

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the nozzle liquid shortage valve which concerns on this invention is demonstrated based on drawing.
As shown in FIGS. 1 and 2, the liquid shortage valve according to the present invention is disposed between the apparatus main body M and the nozzle N, and is basically provided on the valve main body 1 and both sides of the valve main body 1. The automatic valve closing means 2 and the automatic valve opening means 2a are provided.

  The valve body 1 has a base body 4 having a through hole 3 and a valve rod 5 fitted in the through hole 3 so as to be slidable back and forth, and the through hole 3 and the outer peripheral surface of the valve rod 5 are in a watertight state. .

  In the base body 4, an inlet hole 6 and an outlet hole 7 are formed on the side, and the opening holes in the through holes 3 of the inlet hole 6 and the outlet hole 7 are arranged on the same circumferential line of the through hole 3. is doing.

  In the valve stem 5, a material supply hole 8 communicating with the inlet hole 6 and the outlet hole 7 in the valve open state and a compressed air supply hole 9 to the outlet hole 7 in the valve closed state are formed. .

  The material supply hole 8 linearly penetrates the valve stem 5, and the compressed air feed hole 9 is a hole bent at a right angle, and forms an inlet at one end face of the valve stem 5 and an outlet at the valve stem 5. The outlet of the material supply hole 8 and the outlet of the compressed air supply hole 9 are arranged in parallel in the longitudinal direction of the valve stem 5, and the distance between the centers of both outlets is made equal to the stroke length of the valve stem 5. Yes.

  The automatic opening / closing valve means 2 and 2a have a function as an air cylinder. The pistons 11 and 11a are reciprocally accommodated in casings 10 and 10a fixed to both ends of the base body 4, and the pistons 11 and 11a are reciprocated. The pushers 12 and 12a of the valve stem 5 are integrally formed, and the pushers 12 and 12a are inserted into the through holes 3 of the base body 4 through the casings 10 and 10a, and the tips are brought into contact with both end faces of the valve stem 5. It touches.

  The automatic valve closing means 2 has a function of sliding the valve stem 5 in the valve closing direction, and has a communication hole 13 that passes through the piston 11 and the pusher 12, and the communication hole 13 supplies compressed air to the valve rod 5. It communicates with the hole 9.

  The outlet hole 7 passes through a nozzle mounting portion 14 projecting from the side surface of the base 4.

Next, the operation of the nozzle liquid drain valve according to the present invention will be described.
First, as shown in FIGS. 1 and 2, the drain valve according to the present invention is mounted on the apparatus main body M side, and the nozzle N is mounted on the nozzle mounting portion 14 of the base 4.
At the time of discharge, as shown in FIG. 1, the valve body 1 is in an open state, and the material fed from the apparatus body M is material from the tip of the nozzle N through the inlet hole 6 through the material supply hole 8 and the outlet hole 7. Is discharged.
After the completion of the discharge, the material supply from the apparatus main body M is stopped and, as shown in FIG. 2, the compressed air is supplied to the automatic valve closing means 2 to advance the piston 11 and the valve rod 5 is closed. At the same time when the piston 11a of the automatic valve opening means 2a is retracted and the outlet hole 7 and the compressed air supply hole 9 communicate with each other, the compressed air of the automatic valve closing means 2 is communicated with the communication hole 13, compressed air. It is pumped into the nozzle N from the outlet hole 7 through the feed hole 9, and the residual material in the outlet hole 7 and the nozzle N is forcibly removed from the tip of the nozzle N.
When the discharge is resumed, as shown in FIG. 2, compressed air is supplied to the automatic valve opening means 2a to advance the piston 11a, and the valve rod 5 is slid in the valve opening direction and at the same time, the piston 11 of the automatic valve closing means 2 is used. , The inlet hole 6 and the outlet hole 7 and the material supply hole 8 communicate with each other, and then the material is fed from the apparatus main body M.

1 Valve body 2 Automatic valve closing means
2a Automatic valve opening means 3 Through hole 4 Base 5 Valve rod 6 Inlet hole 7 Outlet hole 8 Material supply hole 9 Compressed air supply hole
10, 10a casing
11, 11a piston
12, 12a pusher
13 Communication hole

Claims (1)

  An automatic valve closing means and an automatic valve opening means are provided on both sides of the valve body, the valve body has a base having a through hole, and a valve rod fitted into the through hole so as to be slidable back and forth, An inlet hole and an outlet hole are formed in a side portion of the base body, a material supply hole communicating with the inlet hole and the outlet hole in a valve-open state, and a compressed air to the outlet hole in a valve-closed state. A feed hole is formed, the outlet of the material supply hole and the outlet of the compressed air feed hole are arranged in parallel in the longitudinal direction of the valve stem, and the distance between the centers of both outlets is defined as the stroke length of the valve stem. The automatic valve closing means and the automatic valve opening means are accommodated in a casing fixed to both ends of the base body so that the piston can be reciprocated by air pressure, and a pusher for the valve rod is integrally formed with the piston. The pusher has a tip portion passing through the casing and penetrating the casing. Inserted into a hole and brought into contact with both end faces of the valve stem, the piston and pusher of the automatic valve closing means are formed with a communication hole penetrating the piston and pusher, and the communication hole is supplied with the compressed air A nozzle draining valve characterized by communicating with a hole.

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