KR102039445B1 - A method of manufacturing a cushioning member provided in a bollard in which impact reduction is improved by stretching, stretching, and tensile force and elastic force with a long life without being discolored by ultraviolet rays, and a method of molding a bollard equipped with a cushioning member - Google Patents

Abstract

The present invention relates to a bollard in which a buffer member installed to prevent entry of a vehicle is normally provided integrally. The buffer member produces a rubber sheet in a state in which a rubber raw material mixture, an accelerator raw material mixture, a discoloration preventing material and a reinforcing filler material are mixed under the temperature condition for crosslinking (vulcanization), produces a rubber piece by cutting the rubber sheet to a certain size, puts a plurality of rubber pieces cut into a lower mold of a molding frame, places a bollard frame on upper sides of the rubber pieces put into the lower mold, puts the cut rubber pieces on top of the bollard frame, preliminarily pre-molds an upper mold of the molding frame in a pre-fastened state by lowering the upper mold of the molding frame, and performs integral molding of the bollard frame after the rubber pieces are melted while the upper mold and the lower mold are completely fastened, after the preliminarily pre-molding.

Description

Manufacturing method of the cushioning member provided in the bollard which is not discolored by ultraviolet light, the impact resistance is improved by stretching, tensile force and elasticity and the molding method of the bollard with the buffer member manufactured by the manufacturing method {A method of manufacturing a cushioning member provided in a bollard in which impact reduction is improved by stretching, stretching, and tensile force and elastic force with a long life without being discolored by ultraviolet rays, and a method of molding a bollard equipped with a cushioning member}

The present invention relates to a bollard having a buffer member installed to prevent entry of a vehicle, and more particularly, the wear member or the buffer function does not change according to climatic and environmental conditions without causing the buffer member to be discolored by ultraviolet rays. It is possible to improve the cushioning function, and to form such a cushioning member in a straight line as well as a U-shaped bollard without any distortion during the molding process at once, and at the same time, the molded cushioning member maintains a firm attachment state without turning from the frame. It relates to a bollard provided with a cushioning member.

Generally, a bollard is a structure installed to promote the safety of pedestrians by controlling the entry of vehicles at the boundary of sidewalks and driveways, at crosswalks, or at the entrance of parks.

These bollards are manufactured in various forms in which the bollard frame, which is mostly made of metal such as stainless steel, is bent into a U-shape by straight or banding by casting or extrusion, and is fixed to the bottom of the bollard frame by means of anchors such as anchors on the ground. Will be provided with a fixed portion.

However, since the conventional bollard is made of only metal materials, it is frequently injured when the general person inadvertently falls or the visually handicapped person falls while walking, and when the vehicle is hit, the bollard and the vehicle are severely damaged. there was.

Therefore, it has been disclosed that the shock absorbing member is absorbed by molding to the outer circumferential surface of the bollard frame to reduce injuries or damage to the vehicle to a minimum. However, a problem such that the bollard frame is crushed in the process of forming the shock absorbing member is damaged. there was.

That is, the buffer member is a mixture of a plurality of additives for the mixing of the rubber raw material and the rubber raw material to promote the chemical reaction, the raw material to prevent discoloration, the raw material to maintain the hardness and the filler and reinforcing filler for wear resistance and tensile strength After mixing to vulcanize and manufacture the rubber sheet, the rubber sheet is cut to be inserted into a mold formed of an upper mold and a lower mold of a straight and U-shaped bollard frame shape to reshape the rubber sheet into a bollard frame. By inserting the sheet, the molding conditions of the rubber sheet were formed at a temperature of 140 ° C. to 150 ° C. and 140 to 150 pressures (kgf / cm 2), but the molding pressure generated in the process of forming the rubber sheet in the bollard frame during the molding process Could not endure it would be crushed.

Therefore, since it is difficult to integrally mold the shock absorbing member to the bollard frame, most of the shock absorbing members were manufactured by fitting them to the frame body of the bollard in a state in which the shock absorbing member was manufactured in a cylindrical shape, but another problem of the cylindrical shock absorbing member is straight. Although the fitting can be assembled in the bollard, the U-shaped bollard is manufactured by assembling one by one piece of the cushioning member in a state where most of the cushioning member is cut into several pieces due to the impossibility of fitting the cylindrical cushioning member.

Therefore, there was a difficulty in manufacturing the buffer member integrally formed in the bollard frame, and when the buffer member is divided into several pieces, the manufacturing process is complicated by the additional process, and it is not firmly attached to the bollard. In particular, it has the disadvantage of damaging the design of the bollard.

Therefore, another manufacturing method has been disclosed in which a cylindrical buffer member is integrally formed in a bollard as an upper mold and a lower mold using urethane and silicone having excellent moldability as a raw material without using a rubber raw material, but such a buffer member is used as a raw material. There was a problem that the manufacturing cost according to the expensive, short life and weak wear, maintenance is required, in particular, the impact of the shock-absorbing function is reduced as the frame body and the buffering force of the metal bollards fall.

Therefore, the present invention does not discolor the cushioning member even when easily exposed to ultraviolet rays due to the installation conditions of the bollard, and improves the stretching and tensile force and elasticity to improve the cushioning function due to the impact caused by the shock absorbing member to minimize the injury of the pedestrian or the vehicle It is possible to integrally mold the bollard's frame through the buffer member while solving the problem that the bollard frame is crushed in the molding process so that it is impossible to be integrally molded.

To this end, a rubber raw material mixture composed of a natural rubber raw material, a synthetic rubber raw material, a latex raw material and a carbon black raw material, and zinc oxide (Zno), M (2-Mercptobenzothia-zole), MBTS (2,2) for the promotion of the rubber raw material mixture '-Dibenzothiazyl disulfide), DCP (Dicumyl peroxide), sulfur (Sp), guaronic acid, stearic acid (S / T), paraffin wax (P / W), and antioxidant And rubber reinforcing filler material to improve the physical properties of the rubber is mixed and mixed under the temperature conditions for crosslinking (vulcanization) to prepare a rubber sheet, the rubber sheet is cut to a certain size to produce a rubber piece, molding Put a plurality of rubber pieces cut into the lower mold of the mold, place the bollard frame on the upper side of the rubber pieces put into the lower mold, insert the cut rubber pieces on the upper end of the bollard frame, and lower the upper mold of the molding die. city In the pre-tight state, it is preliminarily molded at least once or three times or less to melt the hard rubber pieces at a temperature of 140 to 150 degrees for 2 to 3 minutes at a temperature of 140 degrees to 150 degrees. The upper mold and the lower mold are completely tightened and heated at a temperature of 140 degrees to 150 degrees and a temperature of 40 to 50 pressure (kgf / cm2) for 25 minutes to melt the rubber pieces so that they can be integrally formed on the surface of the bollard frame.

Therefore, the discoloration is prevented even when exposed to ultraviolet rays for a long time by the cushioning member manufactured by the present invention, as well as excellent hardness, rubber properties are not deformed to provide an improved buffering function to prevent pedestrian injuries or vehicle damage during shock. At the same time, the buffer member can be integrally molded to the bollard frame to provide the ease of manufacture and low manufacturing cost, as well as to provide a high quality product effect by providing an excellent product design.

1 is a block diagram showing a manufacturing process of the rubber sheet for the buffer member of the present invention.
Figure 2 is a block diagram showing the molding process of the bollard is molded buffer member of the present invention.
Figure 3 is a cross-sectional view of the bollard molded in the buffer member of the present invention.
Figure 4 is an embodiment showing a bollard frame is not molded in the buffer member of the present invention.
Figure 5 is one embodiment that is put into the mold for molding of the buffer member of the present invention.
Figure 6 is a step showing the process of the buffer member is molded in the molding die of the present invention.
Figure 7 is a cross-sectional view of the buffer member of the present invention is a pseudo-molded state.
8 is an embodiment in which the molding of the present invention is completed, the bollard is separated from the mold.
Figure 9 is one embodiment where a release layer is applied to the mold for separation before molding the buffer member of the present invention.

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

First, the present invention relates to a bollard installed for the safety of pedestrians by controlling the entry of the vehicle, such as the driveway and the boundary portion of the sidewalk, the entrance of the park, the shock absorbing member is formed by a rubber for shock impact relief It is to be equipped.

The shock absorbing member formed on the bollard of the present invention has a long life even when exposed to a long time due to climatic environmental conditions by improving the wearability without discoloring by ultraviolet rays due to the structure of the bollard installed outdoors. In order to minimize the breakage of the elasticity and strengthening the tensile strength and elastic force to provide a shock absorbing member to improve the impact mitigation function.

In order to manufacture the buffer member, the rubber raw material mixture and the rubber raw material mixture to promote the vulcanization speed and rubber properties of the raw material and the discoloration preventing agent material for preventing discoloration and the hardness and wear resistance and tensile strength (elastic / elastic) rubber It is molded and mixed with a reinforcing filler material to improve the physical properties of the.

At this time, the rubber raw material mixture used as the main raw material is a natural rubber raw material having excellent elongation, a synthetic rubber raw material having a property of elasticity, cold resistance, aging resistance, heat resistance, oxidation resistance, ozone resistance, oil resistance, and chemical resistance and concentrated latex. It consists of a mixture of raw materials and carbon black.

In addition, synthetic rubber raw materials are most similar to ethylene propylene diene monomer (EPDM) and natural rubber, which have excellent ozone resistance, weather resistance, heat resistance, solvent resistance, and excellent insulation, but are more abrasion, aging and heat resistant than natural rubber. It is used as SBR (Styrene Butadiene Rubber) which has vulcanization and stable scorch and easy processability, and it is particularly preferable to use SBR1502 having low hardness among the types of SBR.

When explaining the rubber raw material mixture in more detail, 8 to 12 parts by weight of natural rubber raw materials, 28 to 32 parts by weight of synthetic rubber raw materials, 8 to 12 parts by weight of latex raw materials, 0.5 to 1.5 parts by weight carbon black based on the total weight of the buffer member It is composed of a mixture of a proportion of parts, wherein the synthetic rubber material is most preferably a mixture of 18 to 22 parts by weight of EPDM (Ethylene Propylene Diene Monomer), SBR1502 8 to 12 parts by weight relative to the total weight of the synthetic rubber material. .

The rubber raw material mixture composed of the above weight parts is a primary mixing step in which the mixing mixer is stirred for 5 to 7 minutes while maintaining a temperature of 30 to 40 degrees Celsius by adding to a mixer reader.

In this case, as the stirring temperature is changed, the RPM and the melting time may be adjusted, of course, when the stirring temperature is relatively lower or higher than 30 to 40 ° C, it may not be easily cross-linked to form agglomeration or to form a high viscosity. It is.

When the amount of natural rubber is less than 8 to 12 parts by weight, the elongation is lowered when the added amount is less than 8 to 12 parts by weight.

If the total amount of the synthetic rubber material is less than 18 to 22 parts by weight of EPDM (Ethylene Propylene Diene Monomer) or 8 to 12 parts by weight of SBR1502, the weight of synthetic rubber is less than that of ozone or various climates. Cracks, deformations, or deterioration may occur due to the conditions, and the abrasion property may be deteriorated, and when exceeded, physical properties of the rubber may be deteriorated.

When the amount of latex material is less than or exceeded 8 to 12 parts by weight, the cushioning force and the foaming force are lowered or exceeded so that the molding conditions of the buffer member of the present invention cannot be reached.

When the carbon black raw material is less than 0.5 to 1.5 parts by weight, the oil and heat resistance decreases and the rubber properties change during the mixing process, and when the carbon black raw material is exceeded, it is impossible to process and reach the molding conditions of the buffer member of the present invention. It will not be possible.

Carbon black in the present invention is used as a color paint for producing a gray color, it is also used for the reinforcing agent or oil resistance and heat resistance of the rubber raw material mixture.

In addition, the buffer member may be manufactured in various colors by further including 0.1 to 0.3 parts by weight of various color materials in the first mixing process with respect to the total weight of the buffer member.

When the first mixing step is completed, the mixing agent for mixing for 5 to 7 minutes under the same temperature conditions as the primary mixing step by simultaneously adding the accelerator raw material mixture for the promotion of the rubber raw material mixture and the discoloration preventing agent material for preventing discoloration by ultraviolet rays The process is a secondary mixing step.

The promoter material mixture is zinc (Zno), M (2-Mercptobenzothia-zole), MBTS (2,2'-Dibenzothiazyl disulfide), DCP (Dicumyl peroxide), sulfur (SP), guaronic acid, steric acid (S / T ), Paraffin wax (P / W), it is composed of a mixture of antioxidants.

When explaining the promoter material mixture in more detail, 1.5 to 2.5 parts by weight of zinc (Zno), 0.15 to 0.25 parts by weight of M (2-Mercptobenzothia-zole), MBTS (2,2'-Dibenzothiazyl disulfide) based on the total weight of the buffer member ) 0.2 to 0.3 parts by weight, DCP (Dicumyl peroxide) 0.4 to 0.8 parts by weight, sulfur (SP) 0.3 to 0.7 parts by weight, Kumaron 0.3 to 0.7 parts by weight, sterinic acid (S / T) 0.2 to 0.6 parts by weight, paraffin Wax (P / W) It is a mixture which consists of 0.2-0.6 weight part and antioxidants 0.3-0.7 weight part.

In the above zincification is the addition of less than 1.5 to 2.5 parts by weight of the oxidizing power is lowered, if it is exceeded will lose the elasticity of the rubber.

In addition, when the amount of M (2-Mercptobenzothia-zole) added as an accelerator for crosslinking is less than 0.15 to 0.25 parts by weight or more, and when the amount of MBTS (2,2'-Dibenzothiazyl disulfide) is added to less than 0.2 to 0.3 parts by weight. When the amount of sulfur (SP) added is less than or equal to 0.3 to 0.7 parts by weight, or when the amount of DCP (dicumyl peroxide) is less than or equal to 0.4 to 0.8 parts by weight, the vulcanization time increases and the melting efficiency decreases. This may cause vulcanization to be unstable, molding may not be performed normally due to excessive viscosity formation, and hardness may be lowered.

In this case, the discoloration inhibitor raw material is mixed in a ratio of 0.8 to 1.2 parts by weight based on the total weight of the buffer member.

When the amount of the anti-discoloration agent raw material is less than 0.8 ~ 1.2 parts by weight, the blocking effect of ultraviolet rays is reduced, the discoloration may be generated by the exposed ultraviolet light, there is a problem that can not expect the effect of increasing the physical properties, if exceeded There is a problem that there is no physical property increase effect according to the quantity, and the manufacturing cost is increased, which may cause a cost increase.

On the other hand, the discoloration agent raw material may be used as any one of the sun rust (Sunnoc), sunscreen, or a mixture of the two, in this case, Sunnoc 0.3 ~ 0.7 parts by weight, sunscreen based on the total weight of the discoloration agent raw material It can be mixed in a ratio of 0.3 to 0.7 parts by weight.

In particular, the sunscreen has a disadvantage in that the cost of the raw material is expensive, but has an effective blocking effect against strong ultraviolet light.

When the secondary mixing step is completed, tertiary mixing is performed by mixing a reinforcing filler material to improve physical properties of rubber, that is, hardness and elasticity and elasticity, and stirring for 5 to 7 minutes under the same temperature conditions as the first mixing step. The step is the last one.

The reinforcing filler material may be used in hard coal, it is mixed in a ratio of 35 to 45 parts by weight based on the total weight of the buffer member.

When the reinforcing filler material is less than 35 to 45 parts by weight of the rubber, the hardness of the rubber becomes weak and soft, and the elasticity and elasticity are also lowered, so that the impact relieving effect may be lowered. And the elastic force can be halved.

When the third mixing step is completed to move to the mixer roller to produce a sheet of sheet, the sheet of the plate to the constant area and thickness by repeated folding process in the mixer roller for 8 to 12 minutes to maintain a thickness of 10 ~ 15cm It is made of a rubber sheet having, and through this process to improve the elasticity, tensile strength and elastic force of the rubber sheet.

In addition, the rubber sheet prepared as described above is to be matured for 24 hours to complete the manufacture of the buffer member.

On the other hand, the rubber sheet is best to be manufactured in a size of 1,000cm in length, 600cm in width and 10T in thickness, the size of the rubber sheet can be molded to vary according to the product weight and size.

Hereinafter will be described a method of molding the cushioning member integrally provided in the bollard rubber sheet produced by the above manufacturing method.

In the first step for this molding process, the rubber sheet manufactured by the above manufacturing method is manufactured into rubber pieces 11 of a suitable size through a cutting process,

In the second step of the molding process, the cut rubber piece 11 is introduced into the lower mold 110 in the molding die 100 formed of the lower mold 110 and the upper mold 120,

At this time, the molding die 100 is a bollard frame 20 is made of a molding die 100 according to the shape of the straight or U-shaped.

In the third step molding process, the bollard frame 20 is mounted on the lower mold 110 into which the rubber pieces 11 are inserted,

In the fourth step forming process, another rubber piece 11 is introduced into the upper surface of the bollard frame 20,

In the fifth step of the molding process, the upper mold 120 is lowered so that the rubber fragments 11 inserted in the pretightened state without being completely engaged with the lower mold 110 are softened,

In the sixth step molding process, the upper mold 120 is completely engaged with the lower mold 110, and the rubber pieces 11 are melted by heating and pressure to be applied to the bollard frame 20 so that the buffer member 10 is integrally formed. To be molded,

In the seventh step molding process, the molding member 100 is completed by removing the molding residue remaining in the buffer member 10 by removing the bollard frame 20 in which the buffer member 10 is formed.

At this time, the mold release layer is applied to the molding line of the lower mold 110 and the upper mold 120 of the molding die 100 so that the molded buffer member 10 does not stick to the mold before the rubber pieces 11 are introduced. Forming is to make it easy to remove the bollards in the mold 100 in the molding is completed.

In addition, the bollard frame 20 has a lower portion and the upper portion on which the buffer member 10 is formed of different materials, while improving the adhesion of the shock absorbing member 10 to prevent the release of the molded rubber. To reduce the cost.

The bollard frame 20 will be described in more detail. The lower end of the shock absorbing member 10 that is not molded and exposed to the outside is made of stainless steel which is coated with chromium to give gloss and corrosion does not occur. The top of which is molded) can be used by partitioning into carbon steel that is not plated with chromium.

In addition, in the molding process of the first step of molding the rubber pieces 11 in the molding process of the fourth step, the rubber pieces 11 are heated by heating for 2 to 3 minutes at a temperature of 140 ° C. to 150 ° C. and 0 pressure (kgf / cm 2). ) So that the bollard frame 20 is crushed by the rubber pieces 11 that are temporarily molded so as to be soft.

At this time, the caustic molding of the rubber pieces 11 in the molding process of the fourth step is preferably heated at least once or three times under the above temperature and pressure conditions.

In addition, in the molding step of the fifth step, the rubber pieces 11 are completely melted, and the bollard frame 20 is integrally formed under molding conditions at a temperature of 140 ° C. to 150 ° C. and a pressure of 40 to 50 pressure (kgf / cm 2) 25. It is heated for a minute.

If the molding condition is less than the temperature of 140 ℃ ~ 150 ℃ takes a long time to melt the rubber pieces, there is a problem of productivity, if the excess buffer member 10 to be molded may be discolored.

In addition, if the pressure is less than 40 ~ 50 (kgf / cm2) it may not be uniformly applied to the bollard frame 20 may cause a failure, if it exceeds, the bollard frame 20 is crushed by the heat of the rubber melting the damage is broken It can happen.

At this time, the bollard frame 20 is preferably used 4T to minimize the bending or crushing in the process of the rubber piece 11 is melted and molded.

10: cushioning member 11: rubber pieces
20: bollard frame
100: forming mold
110: lower mold
120: prize money

Claims (12)

delete delete delete delete delete delete delete delete A first step of manufacturing the rubber sheet into rubber pieces through a cutting process;
A second step of inserting the cut pieces of rubber into the lower mold in the molding die formed of the lower mold and the upper mold;
A third step of attaching the bollard frame to the lower mold into which rubber pieces are put;
A fourth step of putting rubber pieces on the upper surface of the bollard frame,
A fifth step of forming the rubber piece to be soft while the upper mold is lowered and not fully engaged with the lower mold,
A sixth step in which the upper mold is completely fastened to the lower mold and the rubber pieces are melted by heating and pressing to integrally mold the buffer member to the bollard frame;
The shock absorbing is improved by the elasticity, tension and elasticity while the lifespan is not discolored by ultraviolet rays, characterized in that manufactured in the seventh step of removing the molding residue by detaching the bollard frame formed by the cushioning member in the molding die Method of forming a bollard provided with a member. The method of claim 9,
Before the rubber pieces are introduced, the mold release agent is prevented from sticking to the lower mold and the upper mold of the molding die so as not to be discolored by ultraviolet rays, and the life is long. Method of forming a bollard with a cushioning member with improved relaxation. The method of claim 9,
Ultraviolet, characterized in that the first step of molding the rubber pieces in the fourth step, the heating conditions 140 ° ~ 150 ℃ at a temperature and 0 pressure (kgf / cm 2) at least once or three times or less 3 times Method of forming a bollard provided with a shock absorbing member that is not discolored by the long life and the shock-absorbing effect is improved by stretching, tension and elastic force. The method of claim 9,
In the fifth step, the rubber pieces are melted and discolored by ultraviolet rays, which are heated at a temperature of 140 ° C. to 150 ° C. and 40 to 50 pressure (kgf / cm 2) for 25 minutes under molding conditions in which the bollard frame is integrally formed. Method of forming a bollard equipped with a shock absorbing member with a long life without impact and improved shock relaxation by stretching, tension and elastic force.

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