CN110801999A - A glue breaking device and a glue dispensing valve - Google Patents

Abstract

The invention belongs to the field of glue dispensing, and particularly relates to a glue breaking device and a glue dispensing valve, which are characterized by comprising a piston and a cylinder body matched with the piston, wherein an elastic piece is arranged between the piston and the bottom wall at the rear end of the cylinder body, a glue injection through hole is formed in the bottom wall, a glue inlet is formed in the top wall at the front end of the cylinder body, a glue outlet is formed in the side wall at the front part of the cylinder body, the piston is positioned at the front part of the cylinder body under the action of the elastic piece and used for blocking the communication between the glue inlet and the glue outlet, a space between the piston and the bottom wall at the rear end of the cylinder body is a backflow chamber, the backflow chamber is; the glue dispensing valve provided by the invention is internally provided with the glue breaking device, and compared with the existing glue dispensing valve, the glue dispensing valve has better drip-proof and wire drawing effects.

Description

A glue breaking device and a glue dispensing valve

technical field

The invention belongs to the field of glue dispensing, in particular to a glue breaking device and a glue dispensing valve.

Background technique

Dispensing valves are generally divided into contact dispensing valves and non-contact dispensing valves. The non-contact dispensing valve is generally driven pneumatically, that is, the compressed air presses the glue into the feed chamber at the lower end of the valve stem along the glue feeding pipeline. When the valve stem goes up, the glue enters the feed chamber, and when the valve stem goes down When the glue is pressed, the glue is extruded from the glue outlet along the glue outlet. A glue breaking device is arranged in the glue outlet pipeline to prevent leakage and wire drawing at the glue dispensing port. The existing glue breaking device has a complex structure and a general effect.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a glue breaking device and a glue dispensing valve with a simple structure and good glue breaking effect.

The technical scheme of the present invention is realized as follows: a glue breaking device includes a piston and a cylinder body matched with the piston, an elastic member is arranged between the piston and the bottom wall of the rear end of the cylinder body, and the bottom wall is provided with a glue injection through hole, The top wall of the front end of the cylinder is provided with a glue inlet, and the side wall of the front of the cylinder is provided with a glue outlet. The space between the bottom walls of the rear end is a backflow chamber, and the backflow chamber is always connected with the glue outlet through an external backflow pipe, and the backflow pipe is connected with the glue dispensing port of the dispensing valve. When working, the glue injection through hole is closed, the return chamber and the return pipe are always filled with glue, and the piston is moved to the rear of the cylinder by the pressure of the glue coming from the glue inlet, so that the glue inlet and the glue outlet are connected.

Further, the glue injection through holes are bolt holes, and bolts are used to seal the glue injection through holes during operation.

Alternatively, the glue injection through hole communicates with the glue feed pipe of the glue dispensing valve through a solenoid valve.

When the above glue breaker works, the return chamber and the return pipeline are filled with glue in advance, and then the glue injection hole is closed. When the piston valve rod goes down, the glue in the glue outlet pipeline enters the cylinder body from the glue inlet of the cylinder block, and the glue pushes the piston Overcoming the elastic force of the elastic piece to move towards the bottom wall, the space of the return chamber becomes smaller, and the glue flows into the return pipe and is discharged from the dispensing port. When the glue inlet and the glue outlet are connected in the cylinder, the glue begins to be discharged from the glue outlet into the return pipe and is discharged. When the glue is discharged from the dispensing port, the amount of glue discharged from the return chamber to the dispensing port gradually becomes smaller. When the pressure on the piston and the elastic force of the elastic component are balanced, the piston stops moving to the rear end, and the return chamber stops discharging glue to the dispensing port. The glue of the glue port is all provided by the glue outlet, and the piston valve rod continues to descend until the prescribed amount of glue is discharged from the dispensing port; the piston valve rod moves upward, the glue in the glue outlet pipe forms a negative pressure, and the glue in the return pipe flows to the cylinder before and after the piston In the space, the glue of the dispensing port connected to the return pipe is sucked back, which can effectively prevent dripping and wire drawing. The piston moves to the top wall of the cylinder under the action of the elastic member's restoring force and the negative pressure of the glue until it reaches the top wall.

It should be pointed out that, depending on the situation of glue dripping and drawing, the design can increase the distance between the glue outlet and the top wall of the cylinder to increase the amount of back suction when the piston is reset.

The present invention provides a glue dispensing valve in which the above glue breaking device is installed. Compared with the existing glue dispensing valve, the glue dispensing valve has better anti-drip and wire drawing effects.

Description of drawings

Fig. 1 is a structural schematic diagram of a glue breaking device of a dispensing valve;

Figure 2 is a schematic diagram of the working state of the glue breaking device;

FIG. 3 is a schematic structural diagram of a glue breaking device of a glue dispensing valve according to another embodiment of the present invention.

In the figure, 1. Piston; 2. Cylinder; 2-1. Glue inlet; 2-2. Glue outlet; 2-3. Elastic part; 2-4. Return chamber; 2-5. Glue injection through hole; .Return pipeline; 4. Glue outlet; 5. Dispensing port; 6. Bolt; 7. Glue inlet; 8. Solenoid valve. The hollow arrow is the moving direction of the piston, and the black arrow is the flow direction of the glue. The graph on the left of Figure 2 shows the working schematic diagram of the glue breaking device when the valve stem goes down, and the graph on the right shows the working schematic diagram of the glue breaking device when the valve stem goes up.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, other implementations obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Referring to Figures 1 to 3, a glue breaking device includes a piston 1 and a cylinder 2 matched with the piston 1. An elastic member 2-3 is provided between the piston 1 and the bottom wall of the rear end of the cylinder 2, and the bottom wall is provided with an elastic member 2-3. Glue injection through holes 2-5, the top wall of the front end of the cylinder 2 is provided with a glue inlet 2-1, the side wall of the front of the cylinder 2 is provided with a glue outlet 2-2, and the piston 1 is under the action of the elastic member 2-3. At the front of the cylinder block 2 and cut off the communication between the glue inlet 2-1 and the glue outlet 2-2, the space between the piston 1 and the bottom wall of the rear end of the cylinder block 2 is the backflow chamber 2-4, and the backflow chamber 2-4 passes through The external return pipeline 3 is always connected with the glue outlet 2-2, and the return pipeline 3 is connected with the glue dispensing port 5 of the dispensing valve. When working, the glue injection hole 2-5 is closed, the return chamber 2-4 and the return pipe 3 are always filled with glue, and the piston 1 is moved to the rear of the cylinder 2 by the pressure of the glue coming from the glue inlet 2-1, so that the glue inlet 2-1 is connected with the glue outlet 2-2,

Glue injection through holes 2-5 are closed by bolts 6 during operation.

When working, fill the return chamber 2-4 and the return pipe 3 with glue in advance, and then use the bolt 6 to close the glue injection hole. When the valve stem goes down, see the left part of Figure 2, the glue in the glue pipe 4 From the glue inlet 2-1 of the cylinder 2 into the cylinder 2, the glue pushes the piston 1 to move towards the bottom wall against the elastic force of the elastic member 2-3, the space of the return chamber 2-4 becomes smaller, and the glue in the return chamber 2-4 flows to the backflow Pipe 3 and discharge from the glue outlet 5, the glue inlet 2-1 and the glue outlet 2-2 are connected in the cylinder 2, the glue starts to be discharged from the glue outlet 2-2 into the return pipe 3 and discharged from the glue outlet 5 , the amount of glue discharged from the return chamber 2-4 to the dispensing port 5 gradually becomes smaller. When the pressure on the piston 1 and the elastic force of the elastic component are balanced, the piston 1 stops moving to the rear end, and the return chamber 2-4 stops moving to the dispensing port. 5. Drain the glue, all the glue in the dispensing port 5 is provided by the glue outlet 2-2, the valve stem continues to descend until the prescribed amount of glue is discharged from the dispensing port 5; The glue in the pipe 3 flows into the space of the cylinder 2 before and after the piston 1, and the glue of the dispensing port 5 connected with the return pipe 3 is sucked back, which can effectively prevent dripping and wire drawing. Under pressure, it moves to the top wall of the cylinder block 2 until it reaches the top wall.

Figure 1 is a partial diagram of a glue dispensing valve, in which the above glue breaking device is installed, the glue inlet 2-1 of the glue breaking device is connected with the glue outlet pipe 4, and the glue outlet 2-2 of the glue breaking device is connected with the glue dispensing valve. The dispensing port 5 is connected. Compared with the existing dispensing valve, the dispensing valve has better anti-drip and wire drawing effects.

Fig. 3 shows another embodiment of the present invention. In the figure, the glue injection through holes 2-5 of the glue breaking device are communicated with the glue inlet pipe 7 of the glue dispensing valve through a solenoid valve 8, and the solenoid valve 8 controls the glue injection through hole. Open and close, and other structures are the same as shown in Figure 1; the glue breaking device is intended to be more convenient and quicker to inject glue with the glue breaking device shown in Figure 1.

Claims (4)

1. A glue breaking device is characterized in that it comprises a piston and a cylinder matched with the piston, an elastic member is provided between the piston and the bottom wall of the rear end of the cylinder, the bottom wall is provided with a through hole for injection, and the The top wall is provided with a glue inlet, the side wall of the front of the cylinder is provided with a glue outlet, the piston is located at the front of the cylinder under the action of the elastic member and blocks the connection between the glue inlet and the glue outlet, and the piston is connected to the bottom wall of the rear end of the cylinder. The space between is a backflow chamber, which is always connected to the glue outlet through an external backflow pipe, and the backflow pipe is connected to the dispensing port of the dispensing valve; when working, the glue injection through hole is closed, and the backflow chamber and the backflow pipe are in contact with the glue outlet. Always filled with glue, the piston is moved to the rear of the cylinder by the pressure of the glue coming from the glue inlet, so that the glue inlet and the glue outlet are connected. 2 . The glue breaking device according to claim 1 , wherein the glue injection through holes are bolt holes, and bolts are used to seal the glue injection through holes during operation. 3 . 3 . The glue breaking device according to claim 1 , wherein the glue injection through hole communicates with the glue feed pipe of the glue dispensing valve through a solenoid valve. 4 . 4. A glue dispensing valve, characterized in that any glue breaking device according to claims 1-3 is installed therein.

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