JPS604039A - Method and apparatus for manufacturing check valve - Google Patents

Abstract

PURPOSE:To raise the reliability of a check valve product by eliminating the needs for manual operation by cutter, etc., and also equalizing the diameter of outlet port by a method in which a check valve without outlet port for preventing back flow is molded, the tip of an intermediate mold is pressed on the molding, and an outlet is formed by press-cutting. CONSTITUTION:A molding material is placesd on the upside of an outer mold 6, an intermediate mold 13 is inserted into the outer mold 6, and the molding material is molded by heating and pressing to form an outlet port 5 of a thickness (or width) 15 between the tip end 11 of the intermediate mold 13 of a cutting edge form and the surface 12 of the lower mold 10. A butt body 16 is positioned insertionally on the upside of the lower mold 10. The butt body 16 is made of a hard rubber or vinyl chloride resin plate, etc., having an elasticity enough to prevent the breakage of the tip end 11 when collided. The outer and intermediate molds 6 and 13 holding a molding 17 as a check valve 1 are pressingly butted to the butt body 16 to form an outlet 5 of a thickness (or width) 15 by cutting it by the tip end 11 of the intermediate mold 13.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a fluid inlet at one end of a flow passage formed of a soft elastic material and provided in the axial direction of the central portion, and an outlet for backflow prevention at the other end of the flow passage. This relates to a method for manufacturing a check valve having a tapered diameter and a manufacturing apparatus therefor.In order to form an outflow port for preventing backflow in this conventionally known check valve, it is necessary to form an outflow port without forming an outflow port. After molding by providing only the wall thickness, the outlet was formed manually using a cutter or the like. Therefore, it not only requires a lot of labor to manufacture, but also has the drawback that the diameter of the outlet port is not uniform.

The present invention relates to a method and apparatus for manufacturing a check valve that eliminates the above-mentioned drawbacks, and includes a fluid inlet at one end of a flow passage formed of a soft elastic material and provided in the axial direction of the central portion. A check valve is provided at the other end of this flow path to form a tapered outlet for preventing backflow, and an outer mold that matches the outer circumferential shape of the check valve, and a check valve located at the lower end of this outer mold. The outflow port is formed by a lower mold that abuts against the outer end surface of the outflow port of the check valve, and a middle mold that approximately matches the inner peripheral shape of the check valve, but whose tip is positioned with a slight gap from the lower mold surface. After forming with a thick wall, the outer mold and the middle mold are separated from the lower mold and raised, and a butting body having elasticity that does not damage the tip even if it collides with the tip of the separated and raised middle mold is attached to the outer mold. , which is positioned facing the lower surface of the medium mold, pressurizes and abuts the outer mold holding the molded product against this abutting body, and forms an outlet in the formed wall thickness by pressing the tip of the medium mold. In order to form an outlet for backflow prevention, the molding process is performed by providing only a thick wall without forming an outlet, and then the molded material is attached to a butting body that has enough elasticity not to damage the tip of the medium size. If the held outer and middle molds are pressed against each other, the outlet will be formed by pressing the tip of the middle mold into the formed wall thickness, which will save you the trouble of manually forming the outlet with a cutter or the like. In addition, the diameter of the outlet becomes uniform, and the reliability of the product can be improved.

An embodiment of the present invention will be described below with reference to the drawings.(1)
is a conventionally known check valve manufactured according to the present invention, which is made of soft synthetic resin, soft rubber, etc., and has a fluid inlet (3) formed at one end of the flow path (2), and has a fluid inlet (3) formed at one end of the flow path (2). A pressure-receiving surface (4) is formed with a tapered diameter at the end, and the end of this pressure-receiving surface (4) is brought into contact without sticking to form an outflow port (5) for preventing backflow. . This check valve (
1) is installed in a pressure fluid flow path, and when pressurized fluid flows in from the fluid inlet (3), the outlet (5) is opened by this pressure and the pressurized fluid flows, but the outlet (5) ) If the pressurized fluid tries to flow in from the opposite direction, the pressure of the pressurized fluid will be applied to the tapered pressure receiving surface (4).
) is closed and has the effect that pressurized fluid cannot flow through it. The mold for forming this check valve (1) includes an outer mold (6) that matches the outer peripheral shape of the check valve (1), and a mold that is located at the lower end of this outer mold (6) to form the check valve. It abuts against the outer end surface (7) of the outlet (5) of (1), and the outer end surface (7)
Lower mold (10) with four relief parts (8) provided on the outer periphery of the corresponding position
Then, the tip part (11), which is hardened and shaped into a blade shape, is made to roughly match the inner circumferential shape of the check valve (1), and is then placed in the lower mold (1).
10) formed by a middle mold (13) located at a small distance from the surface (12) of the mold, and a heated upper mold (14) that fixes this middle mold (13) and is located on the upper surface of the outer mold (6). do. To mold the reverse valve (1), place the molding material on the top of the outer mold (6), insert the middle mold (13) into the outer mold (6), and perform heating and pressure molding to form the blade. Medium size (13
) A thickness (15) for forming the outlet (5) is formed in the interval between the tip (11) of the mold (11) and the surface (12) of the lower mold (10).

Next, the outer mold (6), middle mold (13), and upper mold (14) are separated and raised from the lower mold (10), and the outer mold (6), middle mold (13)
The abutting body (1
6) into the insertion position. This abutting body (16) is made of a hard rubber plate having enough elasticity that the tip (11) will not be damaged even if it collides with the tip (11) of the middle size (13) that has been separated and raised.
It is formed from a PVC resin board, etc. An outer mold (6) holding a molded product (17) that becomes the check valve (1) on this abutting body (16)
, the medium mold (13) is pressed against the medium mold (13), and the outlet (5) is cut into the formed wall thickness (15) by pressing the tip (11) of the medium mold (13). Although the theoretical basis for this push-cut formation by the tip (11) of the outlet (5) is not necessarily clear, the outer mold (6) and the middle mold (13) apply pressure to the abutment body (16) with strong force. When applied, the formed thickness (15) made of a soft elastic material deforms in the direction of the tip (11) due to the impact, and at the same time, the elastic butting body (16) follows this deformation and moves toward the tip (11).
11), it is believed that the formed wall thickness (15) is cut and the outlet (5) is formed.

As described above, in order to form an outflow port for preventing backflow, the present invention is formed by forming only a thickness without forming an outflow port, and then having elasticity to the extent that the tip of the medium size is not damaged. If the outer mold and the middle mold holding the molded product are pressed against the abutting body, the outlet can be cut by pressing the tip of the middle mold to the thickness of the formed wall.The outlet can be formed manually using a cutter or the like. This eliminates the need for a lot of trouble, and the diameter of the outlet becomes uniform, improving the reliability of the product.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a sectional view, FIG. 2 is a partially enlarged sectional view of the abutment body facing the lower surface of the outer mold, and FIG. 3 is a view of the check valve. FIG. (1)・・・Check valve (2)・・・Flow passage (
3)... Fluid inlet (5)... Outlet (6
)...Outer mold (10)...Lower mold (11)...
...Tip (13)...Medium type (15)...
Formed wall thickness (16)...Butting body (17)...
Molded product) Figure 1 Figure 2 Figure 3

Claims (2)

[Claims] (1) A fluid inlet is provided at one end of a flow passage formed of a soft elastic material and provided in the axial direction of the central part, and an outlet for preventing backflow is formed in a tapered shape at the other end of the flow passage. The stop valve is made of an outer mold that matches the outer peripheral shape of this check valve, a lower mold that is located at the lower end of this outer mold and abuts against the outer end surface of the outlet of the check valve, and a lower mold that matches the outer peripheral shape of the check valve. After forming the outer mold and the middle mold by separating the outer mold and the middle mold from the lower mold and lifting them up, the outer mold and the middle mold are separated and raised from the lower mold. An outer mold, a medium mold, in which a butting body that has enough elasticity to not damage the tip even if it collides with the tip of the medium mold is placed facing the lower surface of the outer mold, the middle mold, and the molded product is held on this butting body. A method for producing a check valve, characterized by pressing and abutting the same, and forming an outlet in the formation g by pressing and cutting with a medium-sized tip. (2) A fluid inlet is provided at one end of a flow passage formed of a soft elastic material and provided in the axial direction of the central part, and an outlet for preventing backflow is formed in a tapered shape at the other end of the flow passage. An outer mold that matches the outer peripheral shape of the stop valve, a lower mold that is located at the lower end of this outer mold and abuts against the outer end surface of the outflow port of the check valve, and a tip that approximately matches the inner peripheral shape of the check valve. The middle mold is located with a slight gap from the lower mold surface and has a thick wall for forming an outlet. After molding, the outer mold and the middle mold are separated from the lower mold, and the separated outer mold and the middle mold are pressed against each other. 1. An apparatus for manufacturing a check valve, comprising: a thick abutment for forming an outlet at a medium-sized tip;