KR102360114B1 - Method for manufacturing a pressure fluctuation member for controlling the flow of fluid in the accumulator and the pressure fluctuation member manufactured accordingly - Google Patents

Abstract

The present invention relates to a method for manufacturing a pressure fluctuation member for controlling the flow of a fluid in an accumulator, and to a pressure fluctuation member manufactured thereby. The pressure fluctuation member of the present invention has a fluid inlet through which a fluid passes formed, is coupled to an accumulator where the fluid is filled therein and pressure is formed, and opens and closes the fluid inlet by interlocking with the flow of the fluid. The method for manufacturing a pressure fluctuation member of the present invention comprises: (1) a step for inserting a hard support member into a groove formed in the center of a hemispherical molding part formed in the lower mold; and (2) a step for injecting a rubber liquid into the molding part, bonding and pressing the upper mold, and then separating the upper mold, thereby forming a flexible body in which the support member is integrally formed.

Description

A method for manufacturing a pressure fluctuation member for controlling the flow of fluid in the accumulator and the pressure fluctuation member manufactured accordingly}

The present invention relates to a pressure variable member for controlling the flow of a fluid, and more particularly, a method for manufacturing a pressure variable member that controls the flow of a fluid while its shape is deformed according to a change in hydraulic pressure in an accumulator of a hydraulic breaker, and manufactured accordingly It relates to the pressure fluctuation member.

The hydraulic breaker is configured to hit a chisel mounted on the lower end as the piston in the cylinder repeats vertical movement by hydraulic pressure, and the chisel strikes concrete or rock to crush it.

That is, the crushing force of the chisel is generated from the lower end of the piston to the upper end of the chisel through a process in which the piston repeatedly ascends and descends according to the change in the hydraulic pressure flowing into the cylinder and the change in the gas pressure inside the gas filling chamber formed on the upper part of the piston. It is caused by repeated hitting.

In the hydraulic breaker operating as described above, when the strength of concrete or rock is strong or there is a foreign substance, a large instantaneous change in hydraulic pressure occurs, or a malfunction of the hydraulic pump or control valve or the occurrence of a pulsation wave causes the hydraulic pressure to increase Changes often occur.

If such a momentary change in hydraulic pressure occurs, there is a high possibility that the hydraulic system or hydraulic line will be damaged. Accordingly, an accumulator that acts as a buffer in response to the change in hydraulic pressure is installed in the hydraulic breaker.

The accumulator has a diaphragm having elasticity therein, and one side of the diaphragm is filled with nitrogen gas, and the other side is filled with hydraulic pressure.

The diaphragm protrudes or retracts according to the fluctuation of the hydraulic pressure, which is usually repeated 200 to 1400 times per minute.

Therefore, there was a problem in that a specific part of the diaphragm made of rubber was damaged as fatigue was accumulated due to frequent deformation.

Therefore, in order to solve this problem, there are cases in which the thickness of the diaphragm is made thicker, but in this case, the flexibility is lowered and the operation is not smooth.

In order to improve this, in Korean Patent Laid-Open No. 2003-0017637, a technique for preventing damage by attaching a metal material to a part of the diaphragm has been proposed.

However, in the prior art, there is a problem of causing a larger failure, such as the broken metal fragments are introduced into the cylinder and the pressure system, and the introduced metal fragments are caught in the operation of the piston.

The present invention is to solve the problems of the prior art, and the shape is deformed according to pressure fluctuations to control the fluid, but it is possible to prevent damage to the part where the fluid collides with the moving fluid inlet and impacts, and it can withstand frequent shocks An object of the present invention is to provide a method of manufacturing a pressure fluctuation member for controlling the flow of a fluid in an accumulator so that a shock-resistant part is formed to improve durability, and a pressure fluctuation member manufactured accordingly.

The above-described object of the present invention is to produce a pressure variable member that has a fluid inlet through which a fluid passes, is coupled to an accumulator that is filled with a fluid to form a pressure, and opens and closes the fluid inlet by interlocking with the flow of the fluid A method comprising: a first step of inserting a hard support member into a groove formed in the center of a hemispherical molding part formed in a lower mold of a molding die; A two-step process of injecting a rubber liquid into the molding part, bonding the upper mold to 1.5 to 2 atmospheres at a temperature of 160 to 180° C., and then separating the upper mold to form a flexible body in which the support member is integrated. It can be achieved by a method of manufacturing a pressure fluctuation member for controlling the flow of the fluid of the accumulator, characterized in that it includes.

and extracting the body molded in step 2 from the mold, and then step 3 of forming a shock absorbing part on the lower outer surface of the support member.

The shock absorbing part is characterized in that the heat-resistant base layer formed on the lower outer surface of the contact part, the primer layer formed on the outer surface of the heat-resistant base layer, and the silicone release layer are sequentially applied.

The support member is characterized in that it is selected from the group consisting of urethane, polyamide, polyacetal, polycarbonate, and polyethylene terephthalate, or is formed by mixing two or more.

The support member is embedded in the bottom of the body and has a disk shape, and includes an embedded part having a plurality of through holes, a connection part protruding from one surface of the embedded part, and an end of the connection part integrally formed with the embedded part and It is characterized in that it includes a disk-shaped parallel but convexly formed contact portion to be exposed to the outer surface of the body having a larger diameter than the buried portion.

and a melt-adhesive part that is coated with an adhesive to a predetermined thickness on the upper surface of the contact part to melt and adhere to the body.

The contact portion is characterized in that a plurality of annular protrusions are formed in the form of concentric circles on the surface, and the plurality of annular protrusions can be in close contact with the fluid inlet.

In addition, the above object of the present invention, made of rubber and a hemispherical elastic body; Including; a support member coupled to the bottom of the body, the support member is formed by being selected from the group consisting of urethane, polyamide, polyacetal, polycarbonate, polyethylene terephthalate, or a mixture of two or more, the support member, the body It is embedded in the bottom of the plate and has a disk shape, and includes a buried part having a plurality of through holes, a connecting part protruding from one surface of the buried part, and integrally formed at the end of the connecting part and is parallel to the buried part but has a larger diameter than the buried part. It is achieved by the pressure fluctuation member for controlling the flow of the fluid of the accumulator, characterized in that it includes a disk-shaped contact portion convexly formed so as to be exposed to the outer surface of the body.

According to the present invention, there is an effect of preventing damage to the support member in the process of colliding with the fluid inlet while the bottom surface is abruptly pulled downward according to pressure fluctuations, thereby preventing equipment failure of the hydraulic system due to the generation of fragments.

1 is a flowchart showing a manufacturing process of a pressure fluctuation member according to the present invention;
2 is a perspective view showing a pressure changing member according to the present invention;
3 is a perspective view of the pressure variable member according to the present invention, as viewed from the bottom;
4 is a perspective view of a 'support member' of the pressure variable member according to the present invention;
5 is a cross-sectional view showing a molding part into which the 'support member' of the pressure variable member according to the present invention is inserted;
6 is a cross-sectional view showing an example in which the 'support member' is integrally formed in the pressure variable member according to the present invention;
7 is a cross-sectional view of a support member having a shock absorbing part in the pressure fluctuation member according to the present invention;
8 is a cross-sectional view showing a hydraulic breaker to which a pressure variable member according to the present invention is applied;
9 is a cross-sectional view showing before the operation of the pressure fluctuation member according to the present invention;
10 is a cross-sectional view showing the operation of the pressure fluctuation member according to the present invention;
11 is an enlarged view showing the 'support member' before and after the operation of the pressure variable member according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The terms to be described below are defined in consideration of the functions in the present invention, and it is specified that they should be interpreted as concepts consistent with the technical idea of the present invention and meanings commonly or commonly recognized in the art.

In addition, when it is determined that a detailed description of a known function or configuration related to the present invention may obscure the gist of the present invention, the detailed description thereof will be omitted.

Here, the accompanying drawings are illustrated by exaggerating or simplifying a part for convenience and clarity of explanation and understanding of the configuration and operation of the technology, and each component does not exactly match the actual size.

Among the accompanying drawings, FIG. 1 is a flowchart showing a manufacturing process of a pressure fluctuation member according to the present invention, FIG. 2 is a perspective view showing a pressure fluctuation member according to the present invention, and FIG. 3 is a view of the pressure fluctuation member according to the present invention from the bottom A perspective view, FIG. 4 is a perspective view of a 'support member' of the pressure variable member according to the present invention, FIG. 5 is a cross-sectional view showing a molding part into which the 'support member' of the pressure variable member according to the present invention is inserted, and FIG. 6 is the present invention A cross-sectional view showing an example in which the 'support member' is integrally formed in the pressure fluctuation member according to FIG. 7 is a cross-sectional view of the support member having a shock absorbing part in the pressure fluctuation member according to the present invention, and FIG. A cross-sectional view showing a hydraulic breaker to which a member is applied, FIG. 9 is a cross-sectional view showing before operation of the pressure variable member according to the present invention, FIG. 10 is a cross-sectional view showing after operation of the pressure variable member according to the present invention, and FIG. It is an enlarged view showing the 'support member' before and after the operation of the pressure variable member.

First, as shown in Fig. 8, the pressure change member (A) according to the present invention is applied to the accumulator (K) provided in the hydraulic breaker.

The accumulator (K) is divided into the hydraulic chamber 112 on the fluid inlet 320 side and the gas chamber 140 on the opposite side in the internal space of the accumulator body that is branched and connected to the pipe through the fluid outlet 320. A pressure change member (A) is mounted.

In describing the present invention, the lower part means the fluid inlet 320 side, and the upper part means the gas chamber 140 side.

1 and 5, the present invention is coupled to an accumulator in which a fluid inlet through which a fluid passes is formed, a fluid is filled therein and a pressure is formed, and the fluid inlet is opened and closed by interlocking with the flow of the fluid. In the method of manufacturing a pressure variable member, the first step (S1) of putting a rigid support member (4) in the groove formed in the center of the hemispherical molding portion (L3) formed in the lower mold (L1) of the molding die (S1); After injecting the rubber liquid into the molding part (L3), combining the upper mold (L2) and pressurizing it at a temperature of 160 to 180 °C at 1.5 to 2 atmospheres, and then separating the upper mold (L2) to make the support member (4) Including; a second step (S2) of forming an integrally stretchable body (100).

In step 2 (S2), if it is 160° C. or less, the adhesive force of the support member is lowered, and when it is 180° C. or more, there is a fear that the physical properties of the rubber liquid may be deformed.

In addition, after extracting the body 100 molded in step 2 (S2) from the mold, step 3 (S3) of forming the shock absorbing part 6 on the lower outer surface of the support member 4 (S3); may include.

As shown in FIG. 7 , the impact absorbing part 6 includes a heat-resistant base layer 61 formed on the lower outer surface of the contact part 46 , and a primer layer 62 formed on the outer surface of the heat-resistant base layer 61 , and , the silicone release layer 63 is sequentially applied.

The heat-resistant substrate layer 61 is a polyphenylene sulfide resin (PPS), polyether ether ketone resin (PEEK), polyphthalamide resin (PPA), polyimide resin (PI), polysulfone resin (PSU), polyether It is formed by being selected from the group consisting of sulfone resin (PES) and polyetherimide resin (PEI), or by mixing two or more.

The primer layer 62 includes a silane coupling agent, an organic binder, and an antistatic agent.

The silane coupling agent is an alkoxy silane having an epoxy group.

Alkoxy silane is γ-glycidoxy propyl trimethoxy silane, γ-glycidoxy propyl methyl dimethoxy silane, γ-glycidoxy propyl methyl die It is selected from the group consisting of glycidoxy propyl methyl diethoxy silane.

The organic binder is selected from the group consisting of methacrylate, polyester, acrylate, polyvinyl alcohol, poly acrylamide, polyalkylene glycol, polyalkylene imine, cellulose, polyurethane, and epoxy, melamine. do.

The antistatic agent is selected from the group consisting of metal ion antistatic agents, conductive inorganic particles, low molecular weight anionic or cationic antistatic agents, and conductive polymers.

It is preferable that the application amount after drying of the primer layer 62 is 0.1 to 0.8 mg/cm 2 .

If the application amount is less than 0.1 g / m ² , the surface of the base film cannot be sufficiently covered and the curing reaction of the silicone release layer 244 positioned on the upper layer is affected, thereby causing problems in peel stability, and the application amount is 0.8 g / m 2 When it exceeds m ² , problems such as blocking may occur and adhesion may deteriorate.

The primer layer 62 may be coated using a method selected from bar coating, gravure coating, and die coating.

The silicone release layer 63 may include polysiloxane, a hydropolysiloxane curing agent, and a catalyst.

Meanwhile, the support member 4 may be formed of urethane as a main material, but may be selected from the group consisting of polyamide, polyacetal, polycarbonate, and polyethylene terephthalate, or a mixture of two or more.

According to one example, the support member 4 is made by mixing 30-40 parts by weight of polyamide and 20-30 parts by weight of polyacetal with respect to 100 parts by weight of urethane.

When the amount of polyamide is 30 parts by weight or less, it falls short of the performance standard, and when it is 40 parts by weight or more, there is a risk of excessive strength.

When the amount of polyacetal is 20 parts by weight or less, it falls short of the performance standard, and when it is 30 parts by weight or more, there is a risk of excessive strength.

According to another example, the support member 4 may be a mixture of 20 to 30 parts by weight of polycarbonate and 30 to 40 parts by weight of polyethylene terephthalate with respect to 100 parts by weight of urethane.

Polycarbonate (PC) is an engineering plastic that is lighter than iron, but has strength and durability 250 times that of ordinary glass and about 150 times that of tempered glass.

When the amount of polycarbonate is 20 parts by weight or less, it falls short of the performance standards, and when it is 30 parts by weight or more, there is a risk that the strength becomes excessive.

When the amount of polyethylene terephthalate is 30 parts by weight or less, it falls short of the performance standards, and when it is 40 parts by weight or more, there is a risk that the strength becomes excessive.

According to another example, the support member 4 may include 30 to 40 parts by weight of polyamide and 10 to 20 parts by weight of polyacetal based on 100 parts by weight of urethane.

When the amount of polyamide is 30 parts by weight or less, it falls short of the performance standards, and when it is 40 parts by weight or more, there is a risk of excessive strength.

Polyacetal has high crystallinity and excellent mechanical properties such as bending strength, as well as dimensional stability, fatigue resistance, and abrasion resistance.

When the amount of polyacetal is 10 parts by weight or less, it falls short of the performance standards, and when it is 20 parts by weight or more, there is a risk that the strength becomes excessive.

Meanwhile, as shown in FIG. 4 , the support member 4 is embedded in the bottom of the body 100 and has a disk shape, and includes a buried portion 49 having a plurality of through holes 492 formed therein, and the embedding. The connecting portion 48 protruding from one surface of the portion 49 and the body ( It includes a contact portion 46 convexly formed so as to be exposed to the outer surface of the 100).

7, an adhesive is coated on the upper surface of the contact part 46 of the support member 4 to a predetermined thickness to melt and adhere to the body 100; may include a.

The melt-adhesive portion 47 is a urethane adhesive. Therefore, the bonding force between the body 100 and the support member 4 can be significantly improved by the urethane adhesive.

On the other hand, as shown in FIG. 11 , the contact portion 46 of the support member 4 has a plurality of annular projections formed on its surface in the form of concentric circles, and the plurality of annular projections 50 can be in close contact with the fluid inlet. can

The operation of the present invention constructed in this way will be described.

9 and 11 (a), before the shape of the pressure change member (A) is deformed, the support member (4) is in a state spaced apart from the fluid inlet (320).

Then, as shown in FIGS. 10 and 11 (b), when the shape of the pressure change member (A) is deformed while pressure is applied, for example, the body 100 is inflated and the bottom surface is expanded in the opposite direction do.

The opposite direction means the fluid inlet 320 .

As excessive fluid escapes into the fluid inlet 320, the pressure fluctuates rapidly and the body 100 is pulled toward the fluid inlet 320 to be sucked toward the fluid inlet 320, so that the support member 4 is deformed to a flat shape and the fluid outlet 320 is closed. will block

At this time, the support member 4 collides with the fluid inlet 320 with a strong force, but since it is a synthetic resin material containing urethane, there is no risk of fragmentation.

The present invention is not limited by the above-described embodiments and the accompanying drawings, and various modifications and applications not illustrated are possible without departing from the technical spirit of the present invention, as well as substitution of components and other equivalent embodiments. Since it can be changed, it should be construed as being included within the scope of the present invention for modifications and applications of the features of the present invention.

4: support member 6: shock absorbing part
46: contact part 48: connection part
49: buried part 50: annular projection
61: heat-resistant substrate layer 62: primer layer
63: silicone release layer 100: body
K: accumulator 320: fluid inlet

Claims (7)

In the manufacturing method of a pressure change member, the fluid inlet through which the fluid passes is formed, the fluid is filled therein, and is coupled to an accumulator to form a pressure, and opens and closes the fluid inlet by interlocking with the flow of the fluid,
1 step of inserting a hard support member into a groove formed in the center of the hemispherical molding part formed in the lower mold of the molding die;
A two-step process of injecting a rubber liquid into the molding part, combining the upper mold and pressurizing the upper mold at a temperature of 160 to 180 ° C. at 1.5 to 2 atmospheres, and then separating the upper mold to form a flexible body in which the support member is integrated. ;
Step 3 of extracting the body molded in step 2 from the mold and then forming a shock absorbing part on the lower outer surface of the support member;
The support member is selected from the group consisting of urethane, polyamide, polyacetal, polycarbonate, and polyethylene terephthalate, or is formed by mixing two or more,
The support member is
An embedding part embedded in the bottom of the body and having a disk shape and having a plurality of through holes formed therein;
a connection part protruding from one surface of the buried part;
It is integrally formed at the end of the connection part and includes a contact part parallel to the buried part but having a disk shape with a larger diameter than the buried part and convexly formed so as to be exposed to the outer surface of the body,
Including; a melt-adhesive part that is coated with an adhesive to a predetermined thickness on the upper surface of the contact part to melt and adhere to the body;
A plurality of annular projections are formed on the surface of the contact portion in the form of concentric circles, so that the plurality of annular projections can be in close contact with the fluid inlet,
The shock absorber
A heat-resistant substrate layer formed on the lower outer surface of the contact portion, a primer layer formed on the outer surface of the heat-resistant substrate layer, and a silicone release layer are sequentially applied,
The heat-resistant substrate layer is, polyphenylene sulfide resin (PPS), polyether ether ketone resin (PEEK), polyphthalamide resin (PPA), polyimide resin (PI), polysulfone resin (PSU), polyether sulfone It is selected from the group consisting of resin (PES), polyetherimide resin (PEI), or is formed by mixing two or more,
The primer layer includes a silane coupling agent, an organic binder, and an antistatic agent,
The silicone release layer, polysiloxane, a hydropolysiloxane curing agent, and a method of manufacturing a pressure fluctuation member for controlling the flow of fluid in the accumulator, characterized in that it comprises a catalyst. delete delete delete delete Elastic body made of rubber and having a hemispherical shape;
Including; a support member coupled to the bottom of the body;
The support member is selected from the group consisting of urethane, polyamide, polyacetal, polycarbonate, and polyethylene terephthalate, or is formed by mixing two or more,
The support member is
An embedding part embedded in the bottom of the body and having a disk shape and having a plurality of through holes formed therein;
a connection part protruding from one surface of the buried part;
It is integrally formed at the end of the connection part and includes a contact part parallel to the buried part but having a disk shape with a larger diameter than the buried part and convexly formed so as to be exposed to the outer surface of the body,
Including; and a melt-adhesive part that is coated with an adhesive to a predetermined thickness on the upper surface of the contact part to melt and adhere to the body;
The contact portion is a pressure variable member for controlling the flow of fluid in the accumulator, characterized in that a plurality of annular projections are formed in the form of concentric circles on the surface.
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