JPH0753744Y2 - Sealer coating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a sealer application device for filling a gap or the like of a work with a sealant.

<Prior Art> As shown in FIG.
A valve seat 24 in a valve body 20 on a cylinder equipped with
The valve 23 seated on the valve 24, the piston 33 connected to the valve 23 by the rod 32, and the piston 33 are pushed to move the valve 23 to the valve seat.
A spring 25 for seating on 24 and a sealer tank 26
The sealer inlet 22 for supplying the sealer fed from the pump 27 from the
And an air inlet 31 for opening the valve 23 by supplying the sealer to the upper chamber 29a above the valve 23 from the sealer inlet 22 when the valve 23 is closed. To lower the piston 33 to open the valve 23,
The sealer 29a is forced to flow into the lower chamber 29b below the valve 23 and discharged from the nozzle 21.

<Problems to be Solved by the Invention> In the above conventional device, when the sealer application terminal for the work is used to shut off the air to the piston 33, and when the valve 23 is closed and temporarily stopped, the sealer remains in the lower chamber 29b. Lower chamber with residual pressure 29b
The inner sealer wastedly flowed out from the nozzle 21, which deteriorated the yield of the sealer and drooped onto the work.

<Means for Solving the Problems> The present invention provides a sealer applicator that solves the above-mentioned problems of the prior art, and has a structure in which a piston is moved forward and backward with a constant stroke by a stopper in a cylindrical valve body. The piston is divided into a front chamber and a rear chamber by this piston, a nozzle is attached to the valve body on the front chamber side, a sealer inlet is provided on the rear chamber side, and at the forward end of the piston. There is a bypass passage that connects the front chamber and the rear chamber, and a cylindrical rod that penetrates the rear chamber and projects to the outside of the valve body is coupled to the piston, and the sealer flow that opens to the rear chamber is connected to the cylindrical rod. A sealer return port is provided at the inlet and the outer end of the cylindrical rod, and a spring that always biases the piston toward the retracted end, a sealer tank and the sealer introduction port, and a sealer supply pipe having a pump, Previous The sealer return pipe communicating the sealer return port and the sealer tank, and the sealer supply pipe and the direction switching valve arranged on the sealer return pipe are provided.

<Operation> With the above configuration, the piston moves forward against the spring by the pressure of the sealer supplied to the rear chamber, the bypass passage is opened, and the sealer is guided to the front chamber from this bypass passage and discharged from the nozzle. . When the direction switching valve is switched to the return side of the sealer, the supply of the sealer is stopped and the piston moves backward by the spring. At this time, the residual pressure of the sealer in the front chamber is extracted to the rear chamber from the bypass passage. Further, the sealer in the rear chamber enters from the sealer inflow port of the cylindrical rod by the pressing force of the backward movement of the piston and returns to the sealer tank through the sealer return port and the sealer return pipe.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a cylinder-shaped valve body. A nozzle 2 is attached to the front end of the valve body 1. A piston 3 is fitted in the valve body 1 so as to be able to move forward and backward, and is partitioned by the piston 3 into a front chamber 4 and a rear chamber 5. The piston 3 is provided with stoppers 3a, 6b protruding from the inner wall of the valve body 1.
Stipulated by the constant stroke. A sealer inlet 7 is provided on the side of the rear chamber 5 of the valve body 1 and
On the inner wall of the above, a bypass passage 8 is provided which allows the front chamber 4 and the rear chamber 5 to communicate with each other at the forward end of the piston 3.

A cylindrical rod 9 that penetrates the rear chamber 5 and projects to the outside of the valve body 1 is coupled to the piston 3. This cylinder rod 9
A sealer inlet 10 opening to the rear chamber 5, and a sealer return port 13 opening to the outer end of the cylindrical rod 9. And
A spring seat 11 is fixed to the outer end of the tubular rod 9, and a spring 12 is interposed between the spring seat 11 and the valve body 1. This spring 12 constantly urges the piston 3 to the retracted end.

14 is a sheila tank. The sealer tank 14 and the sealer inlet 7 communicate with each other through a sealer supply pipe 16 and a sealer return port 13
The sealer tank 14 and the sealer tank 14 communicate with each other through a sealer return pipe 17.
Reference numeral 15 denotes a pump provided in the sealer supply pipe 16, which feeds the sealer from the sealer tank 14 to the sealer introduction port 7. A direction switching valve is provided on the sealer supply pipe 16 and the sealer return pipe 17.
18 are arranged. 18a is a sealer supply port, 1
8b is a sealer return port.

Next, the operation of the above configuration will be described. FIG. 1 shows a state in which the piston 3 has moved to the forward end. In this state, the direction switching valve 18 is switched to the sealer supply port 18a, the sealer is introduced from the sealer introduction port 7 into the rear chamber 5, and the piston 3 is pushed to the forward end abutting the stopper 6a by the pressure of the sealer. Has been done. As a result, the bypass passage 8 is opened and the front chamber 4 and the rear chamber 5 are communicated with each other, and the sealer is introduced from the rear chamber 5 to the front chamber 4 and is further guided to the nozzle 2 and discharged from the nozzle 2 to seal the work. Apply.

When the direction switching valve 18 is switched to the sealer return port 18b from such a sealer application state, the sealer supply is cut off,
The sealer return circuit is opened. This allows the piston 3
Moves in the backward direction by the force of the spring 12. At this time, the sealer in the front chamber 4 is sucked into the rear chamber 5 through the bypass passage 8 to remove the residual pressure in the front chamber 4. At the same time, the sealer in the rear chamber 5 flows into the cylindrical rod 9 from the sealer inlet 10 of the cylindrical rod 9 by the pressing force of the piston 3, and the sealer return port 1
3. It is returned to the sealer tank 14 via the sealer return pipe 17.

<Effect of the Invention> As described above, according to the present invention, the piston is inserted into the cylindrical valve body by the stopper so that the piston can move forward and backward with a constant stroke, and the piston divides the valve body into the front chamber and the rear chamber. , A nozzle is attached to the valve body on the front chamber side, a sealer introduction port is provided on the rear chamber side, and a forward passage at the forward end of the piston has a bypass passage communicating with the front chamber and the rear chamber. A cylindrical rod that penetrates through the rear chamber and projects to the outside of the valve main body is coupled, and a sealer inlet opening to the rear chamber and a sealer return port at the outer end of the cylindrical rod are provided to this cylindrical rod, and the piston is always retracted. A spring urging the end, a sealer tank and the sealer inlet, which communicate with each other, and a sealer supply pipe having a pump, a sealer return pipe which communicates with the sealer return port and the sealer tank, and the sealer supply pipe. And the direction switching valve placed on the sealer return pipe, so that the residual pressure of the sealer in the front chamber on the nozzle side is removed by the backward movement of the piston when the supply of the sealer is cut off, and the runoff of the sealer is prevented. To do. In addition, since the sealer in the valve body is returned to the sealer tank by the pressing force of the piston, there is an effect that wasteful consumption due to drooling as in the conventional case is eliminated and the yield of the sealer is improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a device of the present invention, and FIG. 2 is a sectional view of a conventional device. 1 ... Valve body, 2 ... Nozzle, 3 ... Piston, 4 ... Front chamber, 5
... Rear chamber, 6a, 6b ... Stopper, 7 ... Sealer inlet, 8 ... Bypass passage, 9 ... Cylindrical rod, 10 ... Sealer inlet, 12 ... Spring, 13 ... Sealer return port, 14 ... Sealer tank, 15 ...
Pump, 16 ... sealer supply pipe, 17 ... sealer return pipe, 18 ... direction switching valve.

Claims (1)

[Scope of utility model registration request] A piston is inserted into a cylindrical valve body by a stopper so as to be able to move forward and backward with a constant stroke, and the piston divides the inside of the valve body into a front chamber and a rear chamber. A nozzle is attached to the rear chamber, a sealer inlet is provided on the rear chamber side, and a bypass passage communicating with the front chamber and the rear chamber is provided at the forward end of the piston. A cylindrical rod protruding to the outside is coupled, a sealer inlet opening to the rear chamber and a sealer return port provided at the outer end of the cylindrical rod are provided in this cylindrical rod, and a spring that always urges the piston to the retracted end, A sealer supply pipe that communicates between the sealer tank and the sealer introduction port and has a pump, a sealer return pipe that communicates between the sealer return port and the sealer tank, and the sealer supply pipe and the sealer return pipe. Sealer coating apparatus characterized by comprising a direction switching valves.