JPH0137727Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a discharging device for applying a viscous fluid such as a synthetic resin sealant to a predetermined position.

(Prior art) Generally, when applying a high viscosity liquid such as a synthetic resin sealant to a predetermined area by discharging it from a nozzle at a constant pressure, the tip of the nozzle is It uses a dispensing device configured to draw back hot liquid. The details of the discharge device are as shown in FIG. 1, in which 1 is the discharge device, and the supply stop device 2
The nozzle 15 is screwed onto the end of the nozzle 15. The supply stop device 2 is provided with an L-shaped viscous fluid supply passage 3 at its end, with the passage 3 having a small diameter on the upstream side and a large diameter on the downstream side with the valve seat 4 in between. It is formed to have a diameter. Further, a cylinder 5 is formed by screwing a cap 7 to the other end of the supply stop device 2, and a compressed air supply hole 6 is bored in the supply stop device 2 to connect a compressed air supply pipe 13. are doing. Further, a compressed air supply hole 8 is bored in the cap 7 and a compressed air supply pipe 14 is connected thereto. A valve body 9 is attached to the piston 11 by a valve stem 10, and is movably disposed in the large diameter portion of the passage 3 of the supply stop device 2. Further, the piston 11 is movably disposed within the cylinder 5. Pipe 13 for supplying compressed air or supply pipe 1
4 moves the valve body 9 together with the piston 11 to open and close the passage 3.

A viscous fluid supply pipe 12 is installed at the inlet of the passage 3 of the supply stop device 2, and a nozzle 15 is installed at the outlet.
are connected.

When applying the coating using the above-mentioned discharge device, compressed air is supplied from the supply pipe 14 into the cylinder 5 to move the valve body 9 together with the piston 11 in the direction A to open the valve. In this state, viscous fluid is fed into the passage 3 from the supply pipe 12 and discharged from the tip of the nozzle 15 to perform the coating operation. When the predetermined application work is completed, the compressed air supply pipe is switched and compressed air is supplied from the supply pipe 13 into the cylinder 5 to move the valve body 9 together with the piston 11 in the A direction. is brought into contact with the valve seat 4 to close the valve and stop the discharge of viscous fluid. The valve body connecting portion 10a of the valve stem 10, which is located in the large diameter portion of the passage 3 due to the movement of the valve body 9,
When the is moved to the small diameter side, the volume on the large diameter side increases by the volume of the valve body connection part 10a, which creates a negative pressure, so the viscosity that was located at the tip of the nozzle 15 increases. The fluid is drawn back to the passage 3 side to prevent a dripping phenomenon.

(Problem) As described above, in the discharging device configured such that the nozzle 15 is directly attached to the supply stop device 2, the device becomes large, and therefore the nozzle cannot be seen into a narrow space to perform coating work. Therefore, an attempt was made to solve this problem by connecting a predetermined length of pipe between the supply stop device 2 and the nozzle 15, but the pullback force by the valve body 9 did not reach the tip of the nozzle 15. The viscous fluid became droplets and dripped, making it impossible to use as a practical machine.

(Objective) An object of the present invention is to provide a viscous fluid discharge device that has good workability and does not cause a dripping phenomenon.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the viscous fluid discharge device of the present invention includes a valve seat formed in a passage connected to a viscous fluid supply pipe, and a valve seat moved into the passage. A freely disposed valve element opens when it moves downstream and closes when it moves upstream, and the nozzle is connected to a device that stops the supply of viscous fluid by moving the valve element. In the discharge device, the nozzle is connected to a passage downstream from the valve seat via a connecting pipe, and the viscous fluid at the tip of the nozzle is supplied to the nozzle portion by being actuated in accordance with the closing operation of the valve body. It is configured to have a valve body inside that is pulled back to the connecting pipe side to close the valve.

(Embodiment) An embodiment of the configuration of the viscous fluid discharge device of the present invention will be described based on FIG. 2.

Since the supply stop device 2 of the present invention has the same configuration as the supply stop device 2 shown in FIG. 1, explanations regarding the structure, operation, etc. will be omitted. In the figure, 16 is a short connecting tube connected to the outlet of the passage 3 of the supply stop device 2, and 17 is a flexible connecting tube, one end of which is connected to the short tube 16, and the other end is a discharge tube. These are connected to respective nozzles 18 for use. 19 is a nozzle body, in which a passage 20 is bored, the passage has a small diameter on the upstream side and a large diameter on the downstream side, and there is a valve seat 2 at the boundary between the passages.
1 is formed. 22 is a valve body, and the valve stem part 2 is movably attached to the small diameter part and the large diameter part of the passage 20 bored in the nozzle body 19 described above.
2a and a cylindrical portion 22b are formed, and a communicating hole 22c is bored in the connecting portion thereof. 23 is the nozzle body 19
This spring is attached to the large diameter portion of the passage 20 and presses the valve body 22 against the valve seat 21. 24 is a nozzle cap screwed onto the nozzle body 19;
A hole communicating with the large diameter portion of the nozzle body 19 is bored.

When discharging viscous fluid using the above-described discharging device, first, the viscous fluid is prepared in a supply device (not shown). Next, the compressed air source of the compressed air supply circuit (not shown) and the supply pipe 14 are connected to supply compressed air to the cylinder 5 of the supply stop device 2, and the valve body 9 is moved in the direction A together with the piston 11 to open the valve. state. At this time, the valve body 22 of the nozzle 18 is pressed against the valve seat 21 of the nozzle body 19 by the spring 23 and is in a closed state. In this state,
When the supply device (not shown) is started and the viscous fluid is sent at a predetermined pressure, it passes through the supply pipe 12, the gap between the passage 3 of the supply stop device 2 and the valve rod 10, and the connection pipe 17. It is sent to the nozzle 18. When the connecting pipe 17 is filled with viscous fluid and becomes larger than the pressing force of the spring 23 that presses the valve body 22 installed in the passage of the nozzle body 19, the valve body 22 compresses the spring 23 and moves in the direction B. Moving. As a result of this operation, the passage 20 is brought into communication, and the viscous fluid passes through the communication hole 22c of the valve body 22, moves to the large diameter portion on the downstream side of the passage 20, and is discharged from the nozzle cap 24 at a predetermined pressure. In this state, the nozzle 18 is moved along a predetermined coating location to perform coating work.
When the application work is finished and the discharge of the viscous fluid is to be stopped, the supply path of the compressed air supply circuit (not shown) is switched to supply compressed air to the supply pipe 13, and at the same time,
The supply pipe 14 is brought into an air release state, and compressed air is supplied to the cylinder 5 of the supply stop device 2 to move the valve body 9 together with the piston 11 in the A direction to close the valve. To explain this operation in detail, the supply stop device 2
The valve body connecting portion 10a of the valve stem 10, which was in the large diameter portion of the passage 3, moves to the small diameter portion, and the valve body 9 comes into contact with the valve seat 4, stopping the delivery of viscous fluid. By moving the above-mentioned valve body connection part 10a, the volume of the large diameter part where the valve body 9 is located increases by the volume of the valve body connection part 10a, and the viscous fluid corresponding to that volume is connected. It is pulled back to the large diameter part of the passage 3 from the utility pipe 17 side. By this closure operation, the supply of viscous fluid is instantaneously stopped, and the pressing force of the nozzle 18 against the valve body 22 is eliminated. Therefore, the valve body 22 moves in the A direction by the pressing force of the spring 23, contacts the valve seat 21, and stops discharging the viscous fluid. Due to this operation, the valve stem portion 2 of the valve body 22, which is located in the large diameter portion of the passage 20,
2a moves to the small diameter part, the volume of the large diameter part increases by the volume by which the valve stem part 22a moves, and the viscous fluid corresponding to that volume is pulled back from the discharge part of the nozzle cap 24.

In addition, when we conducted a drip test when stopping the discharge using a viscous fluid of 2000 poise, we found that if the volume of the valve stem of the moving valve body was made larger on the supply stop device side, the supply This problem did not occur even when the distance between the stop device and the nozzle was extended to 100 cm. but,
When the volumes of the valve stem portions of the moving valve bodies of the supply stop device and the nozzle were made the same, sagging occurred unless the nozzle was directly connected to the supply stop device. Further, similar results were obtained when the supply stop device side was small.

The valve body of the above-mentioned supply stop device can also be moved by an electrically actuated magnetic mechanism. In addition, the shape of the valve body disposed in the nozzle part is
Similar to the valve body and valve stem installed in the supply stop device, a locking part is provided at the end of the valve stem so that the pressing force of the spring acts so that the valve body contacts the valve seat. It can also be done.

(Effect of the invention) The viscous fluid discharge device of the present invention has a valve seat formed in a passage connected to a viscous fluid supply pipe, and when a valve body movably disposed in the passage moves downstream. In a discharge device in which a nozzle is connected to a device that opens the valve and closes it when the valve moves upstream, and stops the supply of viscous fluid by moving the valve body, the nozzle is connected to the valve via a connecting pipe. The nozzle part is connected to the downstream passage from the seat, and the nozzle part is equipped with a valve element that operates in conjunction with the closing operation of the valve element and draws the viscous fluid at the tip of the nozzle back to the connecting pipe side to close the valve. Since the viscous fluid from the downstream side is pulled back at the supply stop device and the nozzle part, even if the supply stop device and the nozzle are connected with a pipe of a predetermined length, the viscous fluid will not drop from the nozzle. It reliably prevents the product from hanging and dripping, making it possible to apply the product in narrow spaces, and
It can also be applied to automatic coating equipment and the like.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view showing one embodiment of a conventional discharge device. FIG. 2 is a schematic cross-sectional view showing one embodiment of the discharge device of the present invention. 1...discharge device, 2...supply stop device, 7...
Cap, 9, 22... Valve body, 10... Valve stem, 1
1... Piston, 12, 13, 14... Supply pipe, 16... Short pipe, 17... Connection pipe, 18...
Nozzle, 19... Nozzle body, 23... Spring, 24... Nozzle cap.

Claims (1)

[Scope of utility model registration request] A valve seat is formed in a passage connected to a viscous fluid supply pipe, and a valve body movably disposed in the passage opens when it moves downstream and closes when it moves upstream, In a discharge device in which a nozzle is connected to a device that stops the supply of viscous fluid by moving the valve body, the nozzle is connected to a passage downstream from the valve seat via a connecting pipe, and the nozzle is connected to a passage downstream from the valve seat. A viscous fluid discharge device, characterized in that a valve body is installed inside the valve body, which operates in conjunction with the closing operation of the valve body, and draws the viscous fluid at the tip of the nozzle back to the connecting pipe side to close the valve.