JPH0829394B2 - Suction and pressurizing pipe joint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a joining tool for attaching and detaching a suction hose (hereinafter referred to as a tubular body) to a suction box having a model attached thereto in a depressurization molding method called V process. It is about.

[Related Art] Conventionally, there is a ball lock type connector as a connector for attaching and detaching a tube body, and is composed of a socket (female) and a plug (male). The socket has a ball and a sleeve that presses the ball, has a sealing function to prevent leakage at the time of connection, and is equipped with a valve that automatically opens and closes upon connection operation. When the socket valve alone is in contact with the valve seat by the force of the spring.

The plug has a ball groove on the outer peripheral surface, and while the sleeve is pulled, the plug is inserted into the socket, and the ball is fitted into the ball groove of the plug for fixed connection. In the connected state, the valve opens completely, and an annular flow path is formed between the main body and the valve to allow the fluid to flow. To disconnect, pull the sleeve of the socket and pull the socket out of the plug to disconnect, the valve on the socket will automatically close and no fluid will flow out.

Next, in the lever lock type, a lever for locking the socket when connected and a packing for sealing are provided, and a groove for accommodating the cam mechanism of the lever is provided on the outer peripheral surface of the plug. The connection is completed by lifting the lever to the plug insertion side, inserting the plug until it abuts and pulling the lever down. The plug and socket can be separated by pulling up the lever, which is the opposite of the connecting operation.

[Problems to be Solved by the Invention] When the above-described ball-lock type pipe joint tool is used in a casting site, the ball portion malfunctions due to the adhesion of dust particles such as sand or other dust that is generated, so that it is cleaned every time. Need
There was a problem that the service life was small.

Further, the lever lock type tube joint has a longer life than that of the ball lock type, but a sand bite operation failure occurs.

Both the ball lock method and the lever lock method are difficult to seal to prevent sand and dust, and the air purge for removing sand and dust requires dust generation prevention means. In addition, these systems are complicated in structure.

In the vacuum molding method, when the suction box is connected to the suction hose, it may be vacuum-sucked or may be pressurized to separate the model and the mold. It is required to have bonding strength.

It is an object of the present invention to have a self-cleaning function of removing powder particles such as sand adhering to a plug by a flow of air sucked at the time of joining, and having a simple structure and a highly reliable pipe joining for suction and pressurization. To provide the ingredients.

[Means for Solving the Problems] According to the present invention for solving the above problems, a valve opening / closing pin is provided inside a socket containing an electromagnet, and a plug joined to the socket has at least a facing portion of the electromagnet. It is made of a ferromagnetic material and has a built-in spring case with a slidable valve head that is urged toward the valve seat by a spring force, and powder particles are circulated in the fitting portion of the socket and the plug. A pipe joint for suction and pressurization, wherein a possible gap is provided and an O-ring is provided at the tip of the plug.

[Operation] The socket and plug are attracted and joined by the electromagnet,
Do not separate during suction or pressurization.

Then, due to the flow of air sucked during the joining operation,
It is possible to automatically remove and clean the powder particles attached to the fitting surface of the plug.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

 FIG. 1 is a sectional view of an essential part according to an embodiment of the present invention.

In FIG. 1, a socket (female) 1 has a space portion 1a for accommodating an electromagnet 3 for adsorbing a plug (male) 2 having an opposite portion made of a ferromagnetic material, and a current is passed through the electromagnet 3. A hole 1b for communicating with the space 1a.

In addition, the stepped portion 1c of the through hole inside the socket 1 has a raised portion.
Insert the cross-shaped base of the valve opening / closing pin 4 having 4a,
Fix with pin 5. Further, a groove is provided on the inner peripheral surface of the socket 1 to be fitted with the plug 2, and an O-ring 6 is fitted therein. When the O-ring 6 is joined to the plug 2, the O-ring is brought into contact with the slope 2a at the tip of the plug 2. Seal fluid leaks. At this time, the front end surface 2b contacts the inner peripheral end surface 1d of the socket 1.

When the socket 1 and the plug 2 are in a joined state, the end faces 1e, 1f, R portion 1g, the inner surface fitting portion 1h, and the inclined surface portion 1i of the socket 1 respectively face the outer end surface 2c, the R portion 2d of the plug 2 and the fitting A gap is formed between the portion 2e and the tip slope portion 2f. Here, in particular, the gap δ between the fitting portions 1h and 2e needs to be of a size that allows the powder particles or sand adhering to the plug or the like, such as sand, to be entrained in the suction air and flow. In the case of the embodiment, it is 0.3 mm.

The attachment 7 of the suction hose (not shown) is a bolt 8
Attach it to plug 1.

On the other hand, the plug 2 is fixed to a suction box (not shown). A step portion 2g is provided in the through hole inside the plug 2,
The cross-shaped base of the spring case 9 is fitted and fixed with the pin 10. The inner peripheral surface 11a of the valve head 11 is slidably inserted into the outer peripheral surface 9a of the spring case 9. There are springs inside the spring case 9 and valve head 11.
12 will be provided.

Further, a groove is provided on the outer peripheral surface of the valve head 11 and the O-ring 13 is fitted therein. When the plug 2 is a single unit, the spring
The valve head 11 advances due to the restoring force of 12, and the O-ring 13
And the inner slope (valve seat) 2h at the tip of the plug 2 come into contact with each other to seal.

When the socket 1 is joined to the plug 2, the protrusion 4a of the valve opening / closing pin 4 provided inside the socket 1 abuts on the tip 11b of the valve head 11, the valve head 11 is pressed and the spring 12 is compressed, The O-ring 13 seal is released. When electricity is applied at this time, the plug 2 and the socket 1 are attracted by the electromagnet 3, the O-ring 6 provided inside the socket 1 abuts on the slope 2a at the tip of the plug 2, and the tip 2b is inside the socket 1. It contacts the peripheral end surface 1d. In addition,
A gap δ is formed on the fitting surface of the plug 2. Then, the movement of the valve head 11 stops and a suction flow path is formed between the inside of the plug 2 and the inside of the socket 1.

Therefore, a pipe body (not shown) attached to the socket 1
Through a vacuum pump, and the pressure is reduced, for example, at 450 mmhg. When the model and the mold are separated after molding, a pressure of, for example, 1.0 to 2.0 kg / cm ² is applied in the state of being bonded.

The strength of the joining by the electromagnet 3 needs to have a suction force that can withstand both suction and pressurization at the time of joining and that the socket 1 and the plug 2 do not separate. For example, when the diameter of the seal portion of the O-ring 6 is 5 mm, 100 kgF or more is required.

Plugs 2 are attached to the suction box at a plurality of locations, and the plug 2 at one location is always joined to the socket 1 and pulled by a vacuum pump via a tube body to maintain a reduced pressure state. The pipes are connected to move the frame while maintaining the reduced pressure. At this time, in the process of joining the socket 1 to the plug 2, there is a gap δ of a size that allows the powder particles to flow in the fitting surface, so that the sand or the like adhering to the surface of the plug 2 is in the atmosphere. Is sucked into the inside of the socket 1.

Therefore, the pipe connector of the present invention has a function of removing and cleaning the sand adhering to the fitting surface of the plug 2.

In order to disconnect the socket 1 from the plug 2, the current flowing through the electromagnet 3 built in the socket 1 may be cut off. Thus, after detachment, the valve head 11 of the plug 2 closes. Since residual magnetism is generated at the time of separation, in the embodiment, a circuit for reverse excitation by a sequencer is provided.

[Effects of the Invention] As described above, according to the present invention, since it has a function of removing and cleaning dust such as sand adhering to the joint surface of the plug, abrasion of the joint surface / O-ring due to sand can be prevented. Further, the plug and the socket are surely attracted and joined by the electromagnet, and are not separated during suction and pressurization, the structure is simple and the reliability is improved, which is industrially valuable.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part according to an embodiment of the present invention. 1 ... Socket, 2 ... Plug, 2h ... Valve seat, 3 ... Electromagnet, 4 ...
Valve opening / closing pins, 6, 13 ... O-ring, 9 ... Spring case, 11 ... Valve head, 12 ... Spring, δ ... Gap.

Claims (1)

[Claims] 1. A valve opening / closing pin is provided inside a socket containing an electromagnet, and a plug joined to the socket has at least a facing portion of the electromagnet made of a ferromagnetic material and is urged toward a valve seat by a spring force. A spring case having a slidable valve head is built in, a gap is provided in the fitting portion of the socket and the plug so that powder particles can flow, and an O-ring is provided at the plug tip position. A tubular connector for suction and pressurization.