JP2581340Y2 - High-speed printing gun - Google Patents

Description

[Detailed description of the invention]

[0001]

Industrial Applicability The present invention is used for printing material types, dimensions, etc., especially on industrial materials such as steel materials.
The present invention relates to a small, high-speed printing gun that ejects paint, ink, and the like.

[0002]

2. Description of the Related Art A high-speed printing gun of this type includes a spray nozzle for spraying paint, a paint-filled chamber adjacent to the spray nozzle, a valve seat and a valve body provided between the spray nozzle and the paint-fill chamber. A movable iron core supporting the valve element at one end, a fixed iron core disposed opposite to the valve element of the movable iron core, and a movable iron core and a fixed iron core. It comprises a surrounding solenoid coil and a return spring for urging the valve body against the valve seat. The paint-filled room is filled with paint that has been fed under pressure. The printing is performed by closing the valve and stopping the discharge of the pressurized paint.

[0003]

However, in high-speed printing, the valve opens and closes in a cycle on the order of 1 to 10 milliseconds, particularly 3 milliseconds. Done by exercising,
At this time, since the movable iron core repeatedly collides with the fixed iron core, if the movable iron core is operated about 1 million times at 3 ms / cycle, the flat end face of the movable iron core that comes into contact with the fixed iron core is deformed. When the end face of the movable iron core is deformed in this way, the greatest resistance occurs when the movable iron core moves at high speed in the paint, since the end face of the movable iron core is generated, so that the fluid resistance is further increased,
The response was poor.

An object of the present invention is to provide a high-speed printing gun which ensures stable operation for a long period of time by reducing the fluid resistance of a collision surface of a movable iron core colliding with a fixed iron core.

[0005]

In order to achieve the above object, a high-speed printing gun according to the present invention is provided at the center of the collision surface between a movable iron core and a fixed iron core, each being made of cemented carbide or ceramic. Is mounted so as to slightly protrude from the collision surface.

[0006] If the contact surface of one of the contact portions of the movable iron core and the fixed iron core is a flat surface and the other contact surface is a gentle spherical surface, it is convenient for the reason described later.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments shown in the drawings.

The high-speed printing gun shown in FIG.
An injection nozzle 1 for discharging a printing liquid paint such as ink is provided. The injection nozzle 1 and a valve seat 2 adjacent thereto are fixed by screwing a nut 4 into an injection head 3. A cylindrical casing 6 is fixed to the ejection head 3 via a packing 5 with bolts. A paint-filled chamber 7 is formed on the ejection head 3 side of the casing 6, and the paint-filled chamber 7 is connected to a pressurized paint source via a connection port 8 and a hose (not shown). A movable iron core 9 is guided in a reciprocating manner with a gap in a guide hole 7 a adjacent to the paint-filled chamber 7, and a conical coil is mounted so that a valve body 10 connected to one end of the movable iron core 9 is seated on the valve seat 2. Spring 11
Powered by In the guide hole 7a of the casing 6, a fixed iron core 12 is further fixed adjacent to the movable iron core 9, and is sealed from the outside by an O-ring 13. A movable iron core 9 and a fixed iron core 1 are provided outside the casing 6.
2 is provided with a solenoid coil 14.

According to the present invention, the movable iron core 9 and the fixed iron core 12
The contact portions 15 and 16 are attached to the centers of the opposing collision surfaces 9a and 12a so as to slightly protrude from the collision surfaces. The protruding length L of these contact portions 15, 16
If L ′ is too small, the fluid resistance will not decrease, and if it is too large, the attractive force of the movable iron core 9 will be weak.
Is preferred. In addition, when the viscosity of the liquid paint is low, the protrusion length of the contact portions 15 and 16 may be reduced, and when the viscosity of the liquid paint is high, the protrusion length may be increased.
Further, contact portions 15 and 16 between the movable iron core 19 and the fixed iron core 12 are provided.
The smaller the contact area is, the smaller the fluid resistance becomes, but the deformation of the contact portion is increased by the force of collision. To prevent this, the material of the contact portions 15 and 16 is made of cemented carbide (for example, HTI10). Alternatively, ceramics (for example, zirconia-based) was employed.

On the other hand, if the contact area between the contact portions 15 and 16 is too small, the contact area 16 of the fixed iron core 12 will not be brought into contact with the movable iron core 9 due to the radial gap, and if it is too large, the fluid resistance will increase. Therefore, the end surface 9a of the movable iron core 9
Is preferably 1/8 to 1/20 of the area.

Also, the contact surfaces 15a of the contact portions 15, 16
If the shape of the contact surface of either the movable iron core 9 or the fixed iron core 12 is a gentle spherical surface, the shape of the cemented carbide 16a does not occur due to the collision of the edges of the flat surfaces with each other. The contact area can be further reduced.

Next, the operation of the high-speed printing gun thus constructed according to the present invention will be described. In the state of FIG. 1, the valve body 10 at the tip of the movable iron core 9 is seated on the valve seat 2 by the conical coil spring 11 and the valve is closed. When the solenoid coil 14 is energized by energization, the movable iron core 9 is attracted to the right and the valve body 10 is separated from the valve seat 2 to open the valve, while the contact surface 15a of the contact portion 15 of the movable iron core 9 is fixed. Iron core 1
The second collision portion 16 collides with the contact surface 16a. When the valve is opened, the pressurized paint liquid filled in the paint filling chamber 7 is discharged from the injection nozzle 1. When the power to the solenoid coil 14 is cut off, the movable iron core 9 is conveyed by the conical coil spring 11.
Is pushed to the left, the valve element 10 sits on the valve seat 2 and closes the valve, so that the injection stops. This operation is repeated at a high speed to print on the object. As a result of an experiment using the high-speed printing gun according to the present invention, no response failure occurred even when the movable iron core 9 was operated about 100 million times or more at 1.4 ms / cycle. In addition, the high-speed printing gun of the present invention can withstand a longer operation if the operation time of one cycle is increased. Similar results can be obtained when the material of the contact portions 15 and 16 is ceramic (for example, zirconia-based).

[0013]

[Effect of the Invention] In the present invention, a cemented carbide or ceramic contact portion is attached to the center of the collision surface between the movable iron core and the fixed iron core so as to slightly protrude from the collision surface. Although the fluid resistance at the contact surface of the movable iron core, which is the part that generates the largest fluid resistance when moving through the inside at high speed, is greatly reduced, and the contact surface between the movable iron core and the fixed iron core is relatively small, In addition, since the deformation due to the collision does not occur, the operation of the high-speed printing gun that is stable for a long time can be ensured.

Further, since one of the contact surfaces of the contact portions of the movable iron core and the fixed iron core has a gentle spherical surface, the substantial contact area is further reduced, the fluid resistance is further reduced, and the contact surface is further reduced. There is an advantage that chipping of cemented carbide or ceramic due to collision at the edge that occurs in the case of flat surfaces does not occur.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of a high-speed printing gun according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Injection nozzle 2 Valve seat 7 Paint-filled room 9 Movable iron core 9a, 12a Collision surface 10 Valve body 11 Return spring 12 Fixed iron core 14 Solenoid coil 15, 16 Contact part 15a, 16a Contact surface

Claims (2)

(57) [Scope of request for utility model registration] An injection nozzle for injecting a paint, a paint-filled chamber adjacent to the spray nozzle, a valve mechanism including a valve seat and a valve body provided between the injection nozzle and the paint-filled chamber, and a valve body. A movable iron core carried at one end, a fixed iron core arranged opposite to the valve body of the movable iron core, a solenoid coil surrounding these movable iron core and the fixed iron core, and a valve In a high-speed printing gun consisting of a return spring that urges the seat, a cemented carbide or ceramic contact portion slightly protrudes from the collision surface at the center of the collision surface between the movable iron core and the fixed iron core, respectively. A high-speed printing gun characterized in that it is mounted as follows. 2. The high-speed printing method according to claim 1, wherein the contact surface of one of the movable iron core and the fixed iron core has a flat contact surface, and the other contact surface has a gentle spherical surface. For gun.