KR102189030B1 - A Urethane Wheel Having a Antistatic Function and a Method for the Same - Google Patents

Abstract

The present invention relates to an antistatic urethane wheel and a method for manufacturing the same, and more particularly, to an antistatic urethane wheel having a structurally stable shaft structure and an antistatic function, and a manufacturing method thereof. An antistatic urethane wheel and a manufacturing method thereof include a wheel body 11 having a fastening cylinder 12 formed in the center; At least one locking jaw (13_1 to 13_L) formed on the circumferential surface of the wheel body 11 and protruded to the outside; And a contact layer formed along the circumferential surface of the wheel body 11 in a form covering the locking jaws 13_1 to 13_L, and the extension length of the fastening cylinder 12 is larger than that of the wheel body 11.

Description

Urethane Wheel Having a Antistatic Function and a Method for the Same}

The present invention relates to an antistatic urethane wheel and a method for manufacturing the same, and more particularly, to an antistatic urethane wheel having a structurally stable shaft structure and an antistatic function, and a manufacturing method thereof.

Casters, rollers or wheels for transport means such as carts or carts for transporting parts or products can be made of a variety of materials. Such means of transport for the means of transport need to have functions or characteristics suitable for the intended use, and means of transport such as wheels, for example wheels used in means of transport for the transport of automobiles or electronic parts, prevent dust generation while simultaneously charging. It is necessary to have a function that can prevent it. Since the generation of dust is related to the level of wear, it is necessary to prevent the generation of dust from being easily worn, and it is advantageous to have a stable structure for this purpose.

Patent Registration No. 10-1357874 discloses a durable caster wheel capable of preventing the weight and external impact applied during the loading and transporting process and the separation or damage of the tire during continuous movement. In addition, Patent Registration No. 10-0582692 discloses a method of manufacturing an antistatic roller having uniform conductivity, excellent wear resistance, elasticity, and resilience while maintaining the basic physical properties and fine cell structure of polyurethane foam.

The wheel or wheel for a vehicle disclosed in the prior art does not disclose a structure of a stable structure for preventing abrasion or a structure of a wheel for preventing static electricity. It is advantageous that the wheel or wheel basically has a structure that can prevent uneven wear and has an antistatic function depending on the application. However, the prior art does not disclose a wheel or wheel having such a structure.

The present invention has the following objects to solve the problems of the prior art.

Prior Art 1: Patent Registration No. 10-1357874 (Park Sang-ha, Announced on February 4, 2014) Wheel for caster Prior Art 2: Patent Registration No. 10-0582692 (NanoCamtech Co., Ltd., announced on May 23, 2006) Manufacturing method of antistatic roller

An object of the present invention is to provide a urethane wheel having an antistatic function and a manufacturing method thereof capable of preventing uneven wear due to structural stability while at the same time preventing static electricity.

According to a preferred embodiment of the present invention, a urethane wheel having an antistatic function and a method of manufacturing the same include a wheel body having a fastening cylinder formed in the center; At least one locking jaw formed on the circumferential surface of the wheel body and protruding to the outside; And a contact layer formed along the circumferential surface of the wheel body in a form covering the locking jaws, and the extension length of the fastening cylinder is larger than that of the wheel body.

According to another suitable embodiment of the present invention, the contact layer comprises urethane and an antistatic agent.

According to another suitable embodiment of the present invention, it further includes a bearing unit coupled in both directions of the fastening cylinder.

According to another suitable embodiment of the present invention, there is provided a method comprising: preparing a wheel, a bearing unit and an adhesive; Preparing a urethane material and an antistatic agent; Removing air bubbles in a vacuum condition while forming a material for the contact layer by mixing the urethane material and an antistatic agent; The contact layer is heat-sealed to the peripheral surface of the wheel; And aging the heat-sealed wheel at 90 to 150° C., wherein the contact layer has an electrical resistance of 60 to 120 ohms (Ohm).

The wheel according to the present invention is structurally stable due to a flange-shaped wheel structure, thereby reducing noise generation and preventing uneven wear. In addition, a relatively long internal fastening cylinder is formed inside, so that the bush is not required to be used, and the rotational characteristics are improved, thereby reducing noise generation. The wheel according to the present invention is applied to a vehicle component or a transport cart for an electronic component to prevent static electricity and at the same time prevent branching from occurring.

1 shows an embodiment of a wheel structure of a urethane wheel having an antistatic function according to the present invention.
Figure 2 shows an embodiment of an antistatic urethane wheel according to the present invention.
3 shows an embodiment of a bearing inserted into a wheel of a urethane wheel having an antistatic function according to the present invention.
Figure 4 shows an embodiment of a method of manufacturing a urethane wheel with antistatic function according to the present invention.
5 shows an embodiment of a urethane wheel manufactured by the manufacturing method according to the present invention.

In the following, the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings, but the embodiments are for a clear understanding of the present invention, and the present invention is not limited thereto. In the following description, components having the same reference numerals in different drawings have similar functions, so if they are not necessary for the understanding of the invention, they will not be described repeatedly, and well-known components will be briefly described or omitted, but the present invention It should not be understood as being excluded from the embodiment of.

1 shows an embodiment of a wheel structure of a urethane wheel having an antistatic function according to the present invention.

Referring to Figure 1, the antistatic urethane wheel is a wheel body 11 formed with a fastening cylinder 12 in the center; At least one locking jaw (13_1 to 13_L) formed on the circumferential surface of the wheel body 11 and protruded to the outside; And a contact layer formed along the circumferential surface of the wheel body 11 in a form covering the locking jaws 13_1 to 13_L, and the extension length of the fastening cylinder 12 is larger than that of the wheel body 11 To do.

The wheel may be made of a wheel 10 made of metal or a similar material and a contact layer made of a synthetic resin material such as polyurethane while being formed on the circumferential surface of the wheel 10. The left side of FIG. 1 shows a front view of the wheel 10 and the right side shows a side view of the wheel 10.

The wheel body 11 may have a drum shape as a whole, and a fastening cylinder 12 may be formed to pass through a central portion. The fastening cylinder 12 may have a cylindrical shape, and the fastening cylinder 12 may have a constant thickness. A wheel body 11 may be formed along the circumferential surface of the fastening cylinder 12, and the wheel body 11 may include an outer cylinder 111 and a core disk 14. The outer cylinder 111 may have a large diameter while forming the same axis as the fastening cylinder 12, and the core disk 14 is in the longitudinal direction of the fastening cylinder 12 and the middle part and the lengthwise direction of the outer cylinder 111. It can be in the shape of a disk connecting the middle part. One and two reinforcing disks 14a and 14b connecting the front and rear ends of the core disk 14 or the front and rear ends in the longitudinal direction of the outer cylinder 111 and the fastening cylinder 12 may be formed. The core disk 14 or the 1, 2 reinforcing disks 14a, 14b may be in the shape of a disk or a linear member shape. Alternatively, the wheel body 11 may be in the shape of a filled drum. As such, the wheel body 11 may be made in various forms and is not limited to the presented embodiment.

The fastening cylinder 12 may have a relatively long extension length compared to the wheel body 11 or the outer cylinder 111. As shown in FIG. 1, the fastening cylinder 12 may be formed to protrude from the wheel body 11 in the same or different lengths on both sides. Due to this structure, the rotation characteristics of the wheel are improved, and noise is reduced while eliminating the need for a separate bushing. In addition, a plurality of divided boundary regions 141 may be formed on the surfaces of the 1 or 2 reinforcing disks 14a and 14b. For example, six divided boundary regions 141 may be formed in a form extending from the fastening cylinder 12 to the outer cylinder 111. The divided boundary area 141 may have a groove or protrusion shape, and may be formed in various numbers.

At least one locking jaw 13_1 to 13_L may be formed along the outer peripheral surface of the outer cylinder 111 or the wheel body 11. The locking jaws 13_1 to 13_L may be formed to protrude along the outer circumferential surface of the wheel body 11. The locking jaws 13_1 to 13_L may have a width smaller than that of the wheel body 11 and may be formed in a structure extending in a circumferential shape along the outer circumferential surface of the wheel body 11. A plurality of locking jaws 13_1 to 13_L may be formed in the same structure at positions symmetrical to each other. The locking jaws 13_1 to 13_L function to fix the contact layer and at the same time prevent the deformation of the contact layer and thereby reduce noise generation. The locking jaws 13_1 to 13_L may be made in various structures and are not limited to the presented embodiment.

The wheel 10 may be entirely made of aluminum or a similar material, such as die casting, but is not limited thereto. When the wheel 10 is made by die casting or a similar method as described above, a contact layer is formed on the outer circumferential surface of the wheel body 11, and the bearing is coupled to the fastening cylinder 12 to make a wheel. The contact layer can be formed of urethane or polyurethane material, and the bearing can be such as a flange bearing.

Hereinafter, a wheel having such a structure will be described.

Figure 2 shows an embodiment of an antistatic urethane wheel according to the present invention.

Referring to FIG. 2, the contact layer 23 may be coupled to the outer peripheral surface of the wheel body 11, and the bearing unit 21 may be coupled to the fastening cylinder 12. As described above, the wheel body 11 may be integrally made of a material such as aluminum and made by a method such as die casting. In addition, the contact layer 23 may be formed on the outer circumferential surface of the wheel body 11 in a heat-sealing method in a mold or mold made of a synthetic resin material including a urethane material.

The bearing unit 21 may be, for example, a flange bearing, and may be coupled to both directions of the fastening cylinder 12 in a manner such as press fit. Accordingly, the bearing balls 22_1 to 22_M are symmetrically positioned at both portions of the fastening cylinder 12 and are positioned at both ends of the fastening cylinder 12, thereby increasing the load application area to the ground. Accordingly, while improving rotational characteristics, uneven wear of the contact layer 23 may be prevented. In addition, while the contact layer 23 is stably fixed to a predetermined position by the locking jaws 13_1 to 13_L, it may be prevented from being separated from the wheel body 11.

Hereinafter, an embodiment of the bearing unit 21 coupled to the fastening cylinder 12 will be described.

3 shows an embodiment of a bearing inserted into a wheel of a urethane wheel having an antistatic function according to the present invention.

Referring to Figure 3, the bearing unit 21 is a cylindrical bearing body 31; A flange 32 having a shape passing through the center of the bearing body 31; And it may be made of a rim blade 33 formed on the circumferential surface of the bearing body 31.

The flange 32 may have a hollow cylinder shape, and may have a structure in which a fixing means such as a bolt is fastened. The flange 32 may extend in the longitudinal direction, and a bearing body 31 may be formed at one portion. In addition, the bearing ball 22 is accommodated in the bearing body 31 so that the bearing unit 21 can be axially rotated. A bearing body 31 is formed on the circumferential surface of the flange 32, can protrude in both directions of the bearing body 31, and a portion having a large length can be inserted into the fastening cylinder of the wheel. In addition, the other bearing unit 21 is coupled at the other side of the fastening cylinder and the ends of the flange 32 inserted to face each other may be connected inside the fastening cylinder. The bearing body 31 may be inserted into the fastening cylinder in a press-fitting manner, and the bearing unit 21 may be coupled to the fastening cylinder.

The length (D11) of the bearing body 31 is 10 to 16 mm; The protruding length D12 of the flange 32 in one direction is 10 to 20 mm; The protruding length D13 of the flange 32 in the other direction is 3 to 8 mm; And the extension length (D14) of the edge wings 33 may be 0.8 to 2.0 mm, respectively. In addition, the diameter (D21) of the edge wing 33 is 32 to 42 mm; The outer diameter D22 of the flange 32 is 15 to 20 mm; The diameter of the bearing body 31 is 30 to 40 mm; And the thickness of the flange 32 may be 0.03 to 0.10 mm, but is not limited thereto. Although the specifications of the bearing unit 21 are presented as specific values, this is for a clear understanding of the present invention, and it should be understood that the relative specifications are included in the scope of the present invention.

In the presented embodiment, the bearing unit 21 may be made of a flange structure, and may be inserted into both sides of the fastening cylinder and connected by a flange coupling method. The structure of the bearing unit 21 prevents uneven wear of the contact layer and at the same time improves rotational characteristics or noise generation prevention characteristics.

Figure 4 shows an embodiment of a method of manufacturing a urethane wheel with antistatic function according to the present invention.

4, a method of manufacturing a urethane wheel having an antistatic function includes the steps of preparing a wheel, a bearing unit, and an adhesive (P41); Preparing a urethane material and an antistatic agent (P42); Removing air bubbles in a vacuum condition while forming a material for the contact layer by mixing the urethane material and an antistatic agent (P43); The contact layer is heat-sealed to the peripheral surface of the wheel (P44); And aging the heat-sealed wheel at 90 to 150° C. (P45), and the contact layer may have an electrical resistance of 60 to 120 ohms (Ohm).

The wheel can be made from aluminum or similar material as described above, for example by die casting, and the bearing unit can be made by machining, for example. The adhesive may be a thermal adhesive or an ultrasonic resin adhesive, but is not limited thereto, and may be various types of resin adhesives capable of bonding urethane or polyurethane to the peripheral surface of the wheel. When the wheel, the bearing unit, and the adhesive are prepared in this way (P41), a urethane material and an antistatic agent may be prepared (P42).

The urethane material or the polyurethane material may be made, for example, by a polymerization reaction of isocyanate (NCO) and polyol, and may contain an appropriate amount of a curing agent. The curing agent may be, for example, methylene bis(o-chloroaniline) (MOCA), and an additive such as carbon black or silica of 0.1 to 5.0 wt% of the total weight may be added to control the hardness. In addition, the antistatic agent may include, for example, a mixture of a sulfonate salt, a phosphate salt, and a metal; It may include, but is not limited to, a mixture of olefins, amines, diamines, and metals or carbon components, and may be various types of polymeric antistatic agents. 1 to 10 wt% of an antistatic agent for the production of a polyurethane polymer; 10 to 20 wt% of a curing agent; And NCO and polyol making the whole 100 wt% can be a reaction. Also suitable amounts of pigments or additives mentioned above may be added. The polyurethane polymer made as described above may have a surface resistance of 10 ³ to 10 ³ Ω/sq or an electrical resistance of 60 to 120 ohms (Ohm).

When the material for forming polyurethane is prepared (P42), air bubbles may be removed in the vacuum tank in an oven at 60 to 150° C. for 30 to 60 minutes and 10 to 30 minutes in an oven at 60 to 150° C. as the material is blended (P43). In addition, the circumferential surface of the wheel is polished to apply a resin adhesive, and preheated to a temperature of 40 to 60°C. In addition, such a process may be performed in a mold or mold prepared in advance, and a bearing unit may be previously coupled to a wheel whose circumferential surface is polished by a press-fitting method. Alternatively, the bearing unit may be coupled to the wheel after the contact layer is formed. An adhesive may be applied to the circumferential surface of the wheel, and when the wheel is preheated, a polyurethane material may be injected into the mold and a thermal fusion process may proceed for 30 to 70 minutes (P44). Thereafter, when the contact layer is formed and thermally fused, cooling is performed, and the wheel on which the contact layer is formed may be separated from the mold. Thereafter, the wheel may be aged for 8 to 15 hours in an oven maintained at 90 to 150° C. (P45). Then, the polyurethane wheel may be completed by cooling and processing the shape (P46).

The polyurethane wheel according to the present invention has an antistatic function, and can be prevented from being charged by having a certain level of electrical resistance or conductivity. For example, in the polyurethane wheel, the polyurethane polymer may have a surface resistance of 10 ³ to 10 ³ Ω/sq or an electrical resistance of 60 to 120 ohms (Ohm). Alternatively, it may have a conductivity of 1.5 to 5.0 times that of a human body conductivity. In addition, the polyurethane made by this method may have a shore hardness of 60D or more and a tensile strength of 40 MPa or more, but is not limited thereto.

5 shows an embodiment of a urethane wheel manufactured by the manufacturing method according to the present invention.

Referring to FIG. 5, a bearing unit may be coupled to a fastening cylinder formed on the wheel body 11, and the bearing unit may include a bearing body 31 and a flange 32 formed on the bearing body 31. In addition, a contact layer 23 may be formed on the circumferential surface of the wheel body 11. The wheels 30 thus formed can form a means of transport 50 of a transport means, for example a transport cart of parts. The moving means 50 may include a fastening bracket 51 coupled to the transportation means and a pair of supporters 52 formed on the fastening bracket 51, and the wheel 30 is, for example, on the flange 32. It may be rotatably coupled to the supporter 52 by the inserted rotation bolt 53. The wheel 30 can be coupled to various means of transport and is not limited to the embodiment presented.

The wheel according to the present invention is structurally stable due to a flange-shaped wheel structure, thereby reducing noise generation and preventing uneven wear. In addition, a relatively long internal fastening cylinder is formed inside, so that the bush is not required to be used, and the rotational characteristics are improved, thereby reducing noise generation. The wheel according to the present invention is applied to a vehicle component or a transport cart for an electronic component to prevent static electricity and at the same time prevent branching from occurring.

The present invention has been described in detail above with reference to the presented embodiments, but those of ordinary skill in this field will be able to make various modifications and modifications without departing from the technical spirit of the present invention with reference to the presented embodiments. . The present invention is not limited by such modifications and variations of the invention, but is limited by the claims appended below.

10: wheel 11: wheel body
12: fastening cylinders 13_1 to 13_L: locking jaws
14a, 14b: 1, 2 reinforcing disk 21: bearing unit
22: bearing balls 22_1 to 22_M: bearing balls
23: contact layer 30: wheel
31: bearing body 32: flange
33: border wing 50: vehicle
51: fastening bracket 52: supporter
53: rotating bolt 111: outer cylinder
14: core disk 141: partition boundary area

Claims (1)

A wheel body 11 made of a metal material formed along the circumferential surface of the fastening cylinder 12 while being composed of the outer cylinder 111 and the core disk 14;
A plurality of locking jaws 13_1 to 13_L formed to protrude along the outer circumferential surface of the wheel body 11 while having a width smaller than the width of the wheel body 11 and extending in a circumferential shape;
A contact layer 23 formed along the circumferential surface of the wheel body 11 in a form covering the locking jaws 13_1 to 13_L, and comprising urethane and an antistatic agent; And
It includes a bearing unit 21 coupled by bearing balls 22_1 to 22_M symmetrically positioned at both ends of the fastening cylinder 12,
The bearing unit 21 includes a cylindrical bearing body 31 in which a bearing ball is accommodated; A flange 32 having a shape passing through the center of the bearing body 31; And a rim blade 33 formed on the circumferential surface of the bearing body 31, and the bearing body 31 is inserted into the fastening cylinder in a press-fitting manner, and the bearing unit 21 is inserted into both sides of the fastening cylinder 12. It is connected in a flange coupling manner so as to connect from the inside of the fastening cylinder, which is the end of the flange 32,
The core disk 14 has a disk shape connecting the intermediate portion in the longitudinal direction of the fastening cylinder 12 and the intermediate portion in the longitudinal direction of the outer cylinder 111, and the front end and rear end of the outer cylinder 111 in the longitudinal direction Urethane wheels with antistatic function, characterized in that 1 and 2 reinforcing disks 14a and 14b connecting the ends and the fastening cylinder 12 are formed.

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